Engineering plastics generally refers to the plastic material that can be used as a structural material to withstand mechanical stress, can be used in a wide temperature range and more demanding chemical and physical environments.
Engineering plastics can be divided into general engineering plastics and special engineering plastics. General engineering plastics generally refer to five kinds of plastics that have been widely used in industrial production and have a wide range of applications, namely, polyamide (nylon, PA), polycarbonate, Ester (polycarbon, PC), polyoxymethylene (POM), polyester (mainly PBT) and polyphenylene oxide (PPO). The special engineering plastics means that the performance is more excellent and unique, but most of them are not yet large-scale industrialization. Production or production of smaller scale, relatively narrowly used plastics such as polyphenylene sulfide (PPS), polyimide (PI), polysulfone (PSF), polyether ketone (PEK), liquid crystal polymer (LCP Etc.. Xiao Bian has introduced you to all the varieties of engineering plastics in terms of basic performance, processing performance, and use.
General engineering plastics
1, Polyamide PA
Basic properties
Specific gravity: PA6-1.14g/cm3, PA66-1.15g/cm3, PA1010-1.05g/cm3;
Molding shrinkage: PA6-0.8-2.5%, PA66-1.5-2.2%;
Molding temperature: 220-300°C;
Drying conditions: 100-110°C, 12 hours;
Material properties
Tough, wear-resistant, oil-resistant, water-resistant, resistant to bacteria, but highly absorbent. Nylon 6 has good elasticity, high impact strength, and high water absorption; nylon 66 has better performance than nylon 6, high strength, good wear resistance; nylon 610 and nylon 66 is similar, but the water absorption is small, the rigidity is low; Nylon 1010 is translucent, the water absorption is small, the cold resistance is better.
Molding characteristics
1. The crystallization material has a high melting point, a narrow melting temperature range, and poor thermal stability. The material temperature exceeds 300 degrees, and the residence time exceeds 30 minutes, and the decomposition occurs. It is more hygroscopic and requires drying, and the water content must not exceed 0.3%;
2, good liquidity, easy to overflow material. Should be self-locking nozzle, and should be heated;
3, molding shrinkage range and shrinkage rate, obvious direction, easy to shrinkage, deformation, etc.;
4. The mold temperature is selected according to the wall thickness of the plastic part in the range of 20-90 degrees. The injection pressure is selected according to the type of the injection machine, the material temperature, the shape and size of the plastic parts, the mold casting system is selected, and the molding cycle is selected according to the wall thickness of the plastic part. Small viscosity, injection, cooling time should be taken long, and use white oil as a release agent;
5, the form and size of the mold casting system, increase the flow channel and gate size can reduce shrinkage.
The scope of application
Production of general mechanical parts, wear-reducing wear parts, transmission parts, and chemicals, electrical appliances, instruments, etc.
2, polycarbonate PC
Basic properties
Specific gravity: 1.18-1.20g/cm3
Molding shrinkage: 0.5-0.8%
Molding temperature: 230-320°C
Drying conditions: 110-120°C, 8 hours
Material properties
High impact strength, good dimensional stability, colorless, transparent, good coloring, electrical insulation, corrosion resistance, good wear resistance, but poor self-lubricating, stress cracking tendency, easy to hydrolyze at high temperature, poor miscibility with other resins .
Molding characteristics
1. Amorphous material, good thermal stability, wide molding temperature range, poor flowability, low moisture absorption, but sensitive to water, must be dried. Mold shrinkage is small, melt cracking and stress concentration are easy to occur, so molding should be controlled strictly. Conditions, plastic parts must be annealed;
2, high melting temperature, high viscosity, plastic parts greater than 200g should use heated extension nozzle;
3, The cooling rate is fast. The die casting system is based on the principle of thick and short. It is advisable to set up the cold material well. The gate should be large, and the mold should be heated;
4. If the material temperature is too low, it will result in lack of material, the plastic parts will be dull, the material temperature will be too high, and the plastic parts will foam. When the mold temperature is low, the shrinkage rate, elongation, high impact strength, bending resistance, compressive strength , Low tensile strength. When the mold temperature exceeds 120 degrees, the plastic parts cool slowly, and it is easy to deform and stick.
The scope of application
Making small gauge parts, insulating transparent parts and impact resistant parts.
3, POM POM
Basic properties
Specific gravity: 1.41-1.43g/cm3
Molding shrinkage: 1.2-3.0%
Molding temperature: 170-200°C
Drying conditions: 80-90°C, 2 hours
Material properties
Good overall performance, high strength, high stiffness, good abrasion and wear resistance, low water absorption, good dimensional stability, but poor thermal stability, easy to burn, easy to age in the atmosphere exposure.
Molding characteristics
1. Crystalline material, narrow melting range, rapid melting and solidification, crystallization when the material temperature is slightly lower than the melting temperature, medium fluidity, small moisture absorption, and can be dried without drying;
2, Low friction coefficient, good elasticity, Surface defects of wrinkle patterns easily appear on the surface of plastic parts;
3, easy to decompose, decomposition temperature of 240 degrees. Decomposition of irritating and corrosive gases occur. Therefore, the mold steel should be made of corrosion-resistant materials.
The scope of application
Production of wear-reducing wear parts, transmission parts, and chemical, instrumentation and other parts.
4, polyphenylene ether PPO
Basic nature
Specific gravity: 1.07g/cm3
Molding shrinkage: 0.3-0.8%
Molding temperature: 260-290°C
Drying conditions: 130°C, 4 hours
Material properties
1. It is white granules. It has good overall performance and can be used in 120 degree steam. It has good electrical insulation and low water absorption, but it has stress cracking tendency. Modified polyphenylene ether can eliminate stress cracking;
2. Outstanding electrical insulation and water resistance, good dimensional stability, its dielectric properties rank first in plastics;
3, MPPO is a modified material obtained by blending PPO and HIPS. At present, materials on the market are all such materials;
4, has a higher heat resistance, glass transition temperature of 211 degrees, melting point 268 degrees, heated to 330 degrees have a tendency to decompose, the higher the PPO content, the better the heat resistance, heat distortion temperature up to 190 degrees;
5, good flame retardancy, self-interest, moderate flammability when mixed with HIPS, light weight, non-toxic, can be used in food and drug industry. Poor light resistance, long time use in the sun will change;
6, can be modified with ABS, HDPE, PPS, PA, HIPS, glass fiber, etc.
Molding characteristics
1, non-crystalline material, low moisture absorption;
2, poor fluidity, similar to Newtonian fluid, viscosity sensitive to temperature, product thickness is generally more than 0.8mm. Easily decomposed, decomposition of corrosion gas. Should strictly control the molding temperature, the mold should be heated, the pouring system on the flow resistance Should be small;
3, polyphenylene ether water absorption is very low about 0.06%, but the trace amount of moisture will cause the product surface appears silver and other non-smooth phenomenon, it is best for drying, the temperature can not be higher than 150 degrees, otherwise the color will change;
4. The polyphenylene ether molding temperature is 280-330 degrees, and the modified polyphenylene ether molding temperature is 260-285 degrees.
The scope of application
Heat-resistant parts, insulating parts, anti-friction wear parts, transmission parts, medical and electronic parts; gears, blades, valves and other parts that can be used at higher temperatures, can be used instead of stainless steel; screws can be made and fastened Parts and Connectors; Motors, Rotors, Enclosures, Transformer Electrical Parts.
5, polyethylene terephthalate PET
Basic nature
Most of the fibers used in the past, namely polyester fiber, are now rapidly developing into engineering plastics and packaging plastics. Depending on the application, PET can be classified into fiber grade, film grade, blowing bottle grade and reinforcement.
Material properties
1, colorless transparent or milky translucent solid;
2, with high tensile strength, stiffness and hardness, but there is a certain degree of flexibility, good wear resistance, creep resistance, and can maintain these good mechanical properties over a wide temperature range;
3, with excellent electrical insulation;
4, with excellent weather resistance, exposed to outdoor six years, its mechanical properties can still maintain the initial 80%; 5, resistant to weak acids, organic solvents and oils have good chemical stability.
Scope of application
1, the production of film, photosensitive film, such as film-based film, photographic film;
2, as a food, medicines, textiles, precision instruments, electrical components and other packaging, hollow containers made of high strength, transparency, non-toxic and tasteless, is carbonated beverages, beer, edible oil and other widely used plastic packaging materials; electrical material;
3, for the production of a variety of electrical insulation materials, such as wires, switches, electrical enclosures.
6, Polybutylene terephthalate PBT
Basic nature
PBT used as engineering plastics are unmodified and modified. Unmodified grades have high molding shrinkage, and their mechanical properties are inferior to those of other engineering plastics. Therefore, they are rarely used alone. Nearly 80% of PBT are modified.
Material properties
1. It is a milky white crystalline solid, odorless, odorless, nontoxic, and has a shiny surface. The flexibility is better than that of PET, and the melting temperature and rigidity are relatively small;
2, with excellent electrical insulation. Even in humid and harsh environments can also maintain;
3, have good weather resistance;
4, can resist the corrosion of general chemicals, such as weak acid.
The scope of application
1. Make all kinds of automotive parts, such as door handles, bumpers, rearview mirror housings, etc.
2, the production of electrical and electronic parts, such as connectors, sockets, plugs, fuse boxes, etc.;
3, the production of a variety of electrical enclosures and components, such as telephones, indoor and outdoor lighting appliances shell, hair dryer components.
7, UHMWHPE UHMWHPE
Basic nature
The relative molecular mass exceeds 1.5 million. The comprehensive performance is a special engineering plastic that conventional molecular weight polyethylene does not possess. The molecular structure is the same as that of ordinary polyethylene, but its molecular weight is particularly high. In UHMWPE with a relative molecular mass of 1.5 million or more, there are relative Molecular mass of 2 million, 3 million, and even up to 5 million or more grades.
Material properties
1. The average molecular weight is about 350,000 to 8 million. Because of its high molecular weight, it has excellent impact resistance, wear resistance, self-lubrication, chemical resistance and other properties unmatched by other plastics.
2, Excellent low temperature resistance, high impact strength at -40°C, even at -269°C;
3, with electrical insulation, low water absorption and physiological inertia;
4, Has excellent stress cracking resistance, creep resistance and fatigue resistance.
The scope of application
Used in the fields of machinery, transportation, textile, papermaking, mining, agriculture, chemical engineering and sports equipment, among which the most widely used packaging containers and pipelines are used; also because of its excellent physiological inertia, it has been used as heart valves, orthopaedic parts. , artificial joints, etc. used in clinical medicine.
8, thermoplastics
Polyacrylonitrile-Butadiene-Styrene ABS
Basic properties
Specific gravity: 1.05g/cm3
Molding shrinkage: 0.4-0.7%
Molding temperature: 200-240°C
Drying conditions: 80-90°C, 2 hours
Material properties
1, Good overall performance, high impact strength, good chemical stability, good electrical performance;
2, and 372 plexiglass weld well, can be made of two-color plastic parts, and the surface chrome, paint treatment;
3, a high impact, high heat, flame retardant, enhanced, transparent level;
4, liquidity almost worse than HIPS, better than PMMA, PC, etc., good flexibility.
Molding characteristics
1, amorphous material, medium fluidity, large moisture absorption, must be fully dried, the surface of the plastic parts require a long time to preheat the dried 80-90 degrees, 3 hours;
2, should take high feed temperature, high mold temperature, but the material temperature is too easy to decompose (decomposition temperature of> 270 degrees), the plastic parts of higher precision, mold temperature should take 50-60 degrees, high gloss, resistance Thermoplastic parts, mold temperature should take 60-80 degrees;
3, If you need to solve the watermark, you need to improve the fluidity of the material, adopt high temperature, high mold temperature, or change into the water level and other methods;
4, such as the formation of heat-resistant grade or flame-retardant material, 3-7 days after the mold surface will remain plastic decomposition products, resulting in shiny mold surface, the mold needs to be cleaned in a timely manner, while the mold surface needs to increase the exhaust position.
The scope of application
Make general mechanical parts, wear-reducing wear parts, transmission parts and telecommunication parts.
Special engineering plastics
1, polyphenylene sulfide PPS
Basic properties
Specific gravity: 1.36g/cm3
Molding shrinkage: 0.7%
Molding temperature: 300-330°C
Material properties
1. Excellent electrical insulation (especially high-frequency insulation), white, hard and brittle, falling on the ground with metal noise, light transmittance second only to organic glass, coloring water resistance, good chemical stability, excellent resistance Flammable, non-flammable plastic;
2, the general strength, good rigidity, but crisp, easy to produce stress embrittlement; not resistant to benzene, gasoline and other organic solvents; long-term use temperature up to 260 degrees, in 400 degrees of air or nitrogen to maintain stability. By adding glass After the fiber or other reinforcing material is modified, the impact strength can be greatly improved, the heat resistance and other mechanical properties are also improved, the density is increased to 1.6-1.9 g/cm3, and the molding shrinkage is small to 0.15-0.25%.
Molding characteristics
1, amorphous material, moisture absorption, but it should be dried after molding;
2. The fluidity is between the ABS and the PC, the solidification is fast, the shrinkage is small, and it is easy to decompose. The injection pressure and injection speed are higher. The mold temperature should be 100-150 degrees. The main channel taper should be large and the flow channel should be short.
Scope of application
Production of heat-resistant parts, insulation and chemical equipment, optical instruments and other parts. Such as: TV sets, high-voltage components on the computer, the shell, the starter coil of the motor, blades, brush holder and rotor insulation, relays, F-class film etc .. Automotive can produce exhaust gas recirculation valve and pump impeller, bearings, sensing components.
2, polysulfone PSF or PSU
Basic nature
Specific gravity: 1.25-1.35g / cm³;
Molding shrinkage: 0.5-0.7%
Molding temperature: 290-350 ℃
Drying conditions: 130-150 ℃, hours
Material performance
1, Polysulfone is amber transparent solid material, high hardness and impact strength, non-toxic, heat and cold resistance aging resistance, long-term use in the -100-175 degrees. Resistance to inorganic acid and alkali salt corrosion, but not Resistant to aromatic hydrocarbons and halogenated;
2, The glass fiber reinforced modification can greatly improve the wear resistance of the material;
3, polysulfone and ABS, polyimide, polyether ether ketone and fluoroplastics can be modified into polysulfone products, mainly to improve its impact strength and elongation, solvent resistance, environmental performance, processing Performance and electroplatability. Such as PSF/PBT, PSF/ABS, PSF+ mineral powder.
Molding characteristics
1, amorphous material, large moisture absorption, water absorption rate of 0.2% -0.4%, must be fully dried before use, and to prevent re-absorbing moisture. Guaranteed moisture content below 0.1%;
2. The molding performance is similar to that of PC, and the thermal stability is poor. Decomposition begins at 360 degrees.
3, poor fluidity, fast cooling, suitable for high temperature and high pressure molding. The mold should have sufficient strength and rigidity, set up the cold material well, the flow path should be short, the gate size of the plastic wall thickness of 1/2-1/3;
4, in order to reduce the internal stress generated by injection molding products, mold temperature should be controlled at 100-140 degrees. After forming can be annealed glycerol bath treatment, 160 degrees, 1-5 minutes; or take the air bath 160 degrees, 1-4 Hours. Annealing time depends on the size and wall thickness of the product;
5, polysulfone in the molten state is close to the Newtonian body, similar to polycarbonate, from the flow of temperature sensitive, in the 310 degrees -420 degrees, the temperature rises by 30 degrees, the flow increases by 1 times. During molding, the process fluidity is mainly improved by increasing the temperature.
The scope of application
1, suitable for the production of heat-resistant parts, insulating parts, wear-resistant wear-resistant parts, instrumentation parts and medical equipment parts, also applies to the production of low-temperature working parts;
2. Polysulfone is commonly used in the electrical and electronic industry for the manufacture of integrated circuit boards, coil tubes, contactors, sleeves, capacitive films, high-performance alkaline battery housings;
3, polysulfone in microwave ovens for household appliances, coffee heaters, humidifiers, hair dryers, cloth dryers, beverages and food dispensers, etc. can also replace non-ferrous metals for watches, copiers, cameras, etc. Precision structural parts;
4, polysulfone has passed the United States pharmaceutical, food related specifications, can replace stainless steel products, used as a surgical tool tray, sprayer, fluid controller, heart valve, pacemaker, gas masks, dental care and so on.
3, Fluoroplastics
Fluoroplastic is a paraffinic polymer in which part or all of hydrogen is replaced by fluorine and includes polytetrafluoroethylene (PTFE), perfluoroethylene propylene (FEP) copolymer, polyperfluoroalkoxy (PFA) resin, polytrifluoro PCTFF, ECTFE, ETFE copolymer, PVDF and PVF.
Polytetrafluoroethylene PTFE
Basic nature
Specific gravity: 2.1-2.2g / cm³
Molding shrinkage: 3.1-7.7%
Molding temperature: 330-380 ℃
Material performance
1, long-term use temperature -200 - 260 degrees, excellent chemical resistance, corrosion resistance to all chemicals, the lowest coefficient of friction in plastic, as well as good electrical properties, the electrical insulation from temperature Influence, there is 'plastic king';
2, is transparent or translucent state, the higher the crystallinity, the worse the transparency. Raw materials are mostly powdery resin or concentrated dispersion, with a very high molecular weight, a high degree of crystallinity of thermoplastic polymers.
Molding characteristics
1, crystal material, hygroscopic small;
2, poor liquidity, easily decomposed, decomposed produce corrosive gas .Should be strictly controlled molding temperature, the mold should be heated, pouring system on the flow resistance should be small;
3, powdery resin powder powder metallurgy method is often used to shape, the use of sintering method. Sintering temperature 360-380 degrees, can not exceed 475 degrees. Emulsion resin usually cold extrusion and sintering process, can be formed in the surface coating. If you need product transparency, good toughness, you should take rapid cooling. Can also take the extrusion, you can squeeze the tube, rods, profiles;
4, PTFE melt viscosity is high, the viscosity of the container decreases with increasing shear stress, showing its non-Newtonian fluid properties; 5, the secondary processing, can be hot and pressure compound, welding, bonding, strengthening, machining Etc., to make the final product.
The scope of application
Production of corrosion-resistant parts, wear-resistant wear parts, seals, insulation and medical equipment parts.
Polytetrafluoroethylene-ethylene copolymer ETFE
Basic nature
Specific gravity: 1.7g/cm3
Molding shrinkage: 3.1-7.7%
Molding temperature: 300-330°C
Material properties
1, Long-term use temperature -80--220 degrees, excellent chemical resistance, corrosion resistance to all chemicals, the lowest coefficient of friction in plastic, and very good electrical properties, its electrical insulation is not subject to temperature Influence, there is the name of 'plastic king';
2, its chemical resistance is similar to PTFE, better than vinylidene fluoride;
3, Its creep resistance and compressive strength are better than PTFE, high tensile strength, elongation up to 100-300%, good dielectric properties, excellent radiation resistance.
Molding characteristics
1, crystallization material, moisture absorption can be processed into finished products by the usual processing method of thermoplastics;
2. Poor fluidity, easy to decompose, produce corrosive gas when decomposed. It is advisable to strictly control the molding temperature not to exceed 350 degrees, the mold should be heated to 100-150 degrees, the pouring system should have small resistance to the material flow. Formable 0.7-0.8mm thick Thin wall simple products; 3, transparent pellets, injection molding, extrusion molding. Molding temperature 300-330 degrees, 350 degrees above easily cause discoloration or bubbles. Should be high-speed low-pressure molding, and pay attention to demoulding will be more difficult.
The scope of application
1, suitable for the production of corrosion-resistant parts, wear-resistant wear-resistant parts, seals, insulation and medical equipment parts;
2, wire, cable insulation, anti-corrosion equipment, sealing materials, valve bushings, and chemical containers.
Soluble polytetrafluoroethylene PFA
Basic nature
Specific gravity: 2.13-2.167g/cm3
Molding shrinkage: 3.1-7.7%
Molding temperature: 350-400°C
Material properties
1. It is a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene. Melt-adhesion is enhanced and the viscosity of the solution is decreased. The performance is not changed compared with PTFE. This resin can be used directly. Ordinary thermoplastic molding process into products;
2, Long-term use temperature -80--260 degrees, excellent chemical resistance, corrosion resistance to all chemicals, the lowest friction coefficient in plastic, and very good electrical properties, its electrical insulation is not subject to temperature Influence, there is the name of 'plastic king';
3, Its chemical resistance is similar to PTFE, better than vinylidene fluoride;
4. Its creep resistance and compressive strength are better than PTFE, high tensile strength, elongation up to 100-300%, good dielectric properties, excellent radiation resistance, flame resistance up to V0 grade.
Molding characteristics
1, crystallization material, moisture absorption can be processed into finished products by the usual processing method of thermoplastics;
2. Poor fluidity, easy to decompose, produce corrosive gas when decomposed. It is advisable to strictly control the molding temperature not to exceed 475 degrees, the mold should be heated to 150-200 degrees, and the gating system should have small resistance to the material flow;
3, transparent pellets, injection molding, extrusion molding. Molding temperature 350-400 degrees, 475 degrees above easily lead to discoloration or bubbles. Note that demoulding will be more difficult;
4, due to the molten material on the metal corrosion, long-term production, molds need to electroplating chromium.
The scope of application
1, suitable for the production of corrosion-resistant parts, wear-resistant wear-resistant parts, seals, insulation and medical equipment parts;
2, high temperature wire, cable insulation, anti-corrosion equipment, sealing materials, valve bushings, and chemical containers.
4, Poly(aryl ether ketone) PEAK
Polyaryletherketone (PEAK) is a type of polymer in which phenylene rings are linked by ether bonds and carbonyl groups. Currently, there are mainly polyether ether ketone (PEEK), polyether ketone (PEK), and polyether ketone ketone (PEKK). Polyether ether ketone ketone (PEEKK) and polyether keto ether ketone ketone (PEKEKK) and other varieties. In the polyaryletherketone series, the lower the ratio (E/K) of the ether bond to ketone group in the molecular chain, The higher the melting point and the glass transition temperature, the more ether bonds in the polyaryletherketone molecular structure make it more flexible, so it can be processed by thermoplastic engineering plastics.
Material properties
1, with good high temperature performance, long-term use temperature above 240 °C;
2, extremely high mechanical properties, excellent chemical resistance, and good radiation resistance, can withstand 10MGy gamma ray irradiation;
3, the combustion performance can reach UL94V-0 level, and the amount of smoke when burning is very small and non-toxic, the heat released when burning is also very small, which is an important technical performance of the aircraft interior trim;
4. Good electrical performance over a wide range of operating temperature and frequency range, low dielectric loss at high frequency, excellent high temperature, high strength Class C electrical insulation.
The scope of application
1. It is mostly used in the field of high-tech aerospace or some of the structural components of the automobile industry, electrical and electronic industry and machinery industry where the technical requirements are more demanding;
2, for the aircraft on a variety of fire-resistant, oil resistant connectors; weather resistance, creep resistance of the radome;
3, for the automotive industry and machinery industry in a variety of components can withstand dynamic loads, such as bearing retainers, gears, hot water pumps, turbine blades, wear-resistant seals, etc.;
4. In medical devices, PPEK manufactures heaters and pressure sensor housings for hemodialysis machines and dental instruments that require disinfection and sterilization. PPEK can also replace metals to make human bones. The potential application prospects are very attractive.
5, polyarylate PAR
Basic nature
Specific gravity: 1.2-1.26g/cm3
Molding shrinkage: 0.8%
Molding temperature: 300-350°C
Drying conditions: 100~120°C, 5 hours
Material properties
1. It is a transparent amorphous thermoplastic engineering plastic, with excellent heat resistance, flame retardancy and non-toxicity. It can be directly processed into ordinary products by ordinary thermoplastic molding methods;
2, with excellent thermal properties, under a load of 1.86MPA, the heat distortion temperature of up to 175 degrees, the decomposition temperature of 443 degrees. Its various mechanical properties by temperature less affected.
Molding characteristics
1. As the product wall thickness increases, the molding shrinkage increases;
2, Hygroscopicity is relatively small, about 0.1-0.3%, but the trace amount of water during injection molding can cause the polyarylate to decompose. Therefore, the material must be dried before molding. Its moisture content is less than 0.02%;
The scope of application
1, suitable for the production of heat-resistant, flame-resistant and dimensional stability of electrical components. Connectors, coil frame, relay housing;
2, lighting parts. Can be made into a transparent lampshade, lighting, automotive reflectors and so on.
6, Liquid Crystal Polymer LCP
Liquid crystal polymer refers to a polymer material that can form a liquid crystal state under certain conditions, abbreviated as LCP. It is one of the fastest-growing new materials in recent years. It can be divided into two types: LLCP and TLCP. Thermotropic liquid crystals are liquid crystals in the molten state. The main applications for engineering plastics are in this category. According to the temperature class, they can be divided into super heat resistant type, medium heat resistant type, and low heat resistant type. .
Material properties
1. LCP is a high-strength, high-modulus, creep-resistant, high-impact high-molecular material. Its mechanical properties are much higher than those of ordinary engineering materials.
2. Outstanding wear resistance, high surface hardness, low wear volume, minimal molding shrinkage, excellent processing fluidity, high thermal stability and heat resistance, excellent electrical insulation;
3, Has excellent chemical stability, is also very stable to ultraviolet radiation. With outstanding flame retardancy, generally no need to add flame retardant to achieve UL94V-0 level of flame retardant, smoke is also very low;
4, also has excellent vibration absorption characteristics, used as acoustic components can reduce noise.
The scope of application
1. High-density connectors, bobbins, bobbins, sockets, etc.; loudspeaker vibration boards in audio-visual equipment, headphone switches, floppy disks in office equipment, hard disk drives, copies, and other parts;
2, in the chemical industry, for a variety of devices and components, such as distillation tower packing, valves, oil well equipment, etc.;
3, In the aerospace, aviation, military industry and other cutting-edge technology fields, has a wide range of application prospects. Such as the use of its high temperature, flame retardant, low smoke characteristics, can be used for various parts of the aircraft;
4, for medical devices has a unique advantage. Due to the low invasiveness of surgical instruments LCP material, will become the master of medical miniaturization technology;
5, LCP other microwave oven stove containers, packaging materials, sports equipment and so on.
7, Polyimide PI
Polyimide, abbreviated as PI, is the earliest high-temperature, high-strength special engineering plastics. It occupies an extremely important position in heat-resistant engineering plastics. It is an aromatic heterocyclic polymerization containing imide groups in the main chain of molecules. The general name of the product. Has been industrialized production and scale of the species are mainly benzene type polyimide, polyamide imide (PAI), polyetherimide (PEI) and bismaleimide (BMI).
Material properties
1, excellent mechanical properties, high tensile strength, creep resistance, wear resistance is also very good;
2, excellent heat resistance, long-term use temperatures are above 200 °C. Low temperature resistance is also very prominent, can maintain mechanical strength at -269 °C low temperature;
3, is a flame-retardant polymer, low combustion smoke density, low toxic gas content;
4, excellent radiation resistance, corona resistance is better than other engineering plastics.
The scope of application
Aircraft engine parts, aircraft internal structure, etc .; high strength and dimensional stability of civilian industrial and military sockets, electronic instruments and household appliances some of the high-performance working parts; engine piston, connecting rod, speed gears and some high temperature Precision parts, but also for the manufacture of multi-dose sterilized medical utensils, medical devices, and some working parts that need to be exposed to cryogenic temperatures and even to liquid nitrogen.
With the continuous improvement of the modification technology, high-performance and new functionalized modified plastics are gradually replacing ordinary plastics and other materials. They are widely used in home appliances, office equipment, automobiles, and machinery and chemical industries. Common eight functionalized modified engineering plastics.
1, wear-resistant modified engineering plastics
Wear-resistant modified engineering plastic can provide a lower friction coefficient to reduce the wear rate.For example, the use of a blood glucose meter lid wear-resistant materials can increase its back and forth opening and closing of the service life.At the same time, wear modification engineering Plastic is also used in color products, even between different materials, and in single-use products such as needles and blades also benefit from the lubricity of the material.Other applications of wear resistant materials include catheters , Bushings, gears and vacuum tubes, as well as other effects include reduced noise due to the smooth movement of components and improved processing performance of plastics and extrusion molding efficiency.
Wear-resistant polyetheretherketone is a kind of special engineering plastic with excellent comprehensive performance. It is not only wear-resistant, but also has excellent heat resistance, chemical resistance, radiation resistance, electrical properties, flame retardancy, etc. It is widely used in automobiles. , Electrical and mechanical and chemical industries.
Polyformaldehyde wear resistance, creep resistance, chemical resistance, hardness, Polyester wear-resistant polyoxymethylene products are widely used in automotive, electronic appliances and household appliances.
2, conductive modified engineering plastics
When the thermoplastic material adds conductive components, it has a permanent electrostatic dissipative (ESD) and anti-electrostatic build-up to protect it. Conductive thermoplastic materials allow the release of static electricity, rather than accumulating and discharging rapidly. Can damage sensitive electronic components and can cause an explosion in a flammable environment. Accumulated static electricity can block the transmission of materials and interrupt mechanical transmission. Conductive thermoplastic materials can be widely used in color matching products, and some conductive materials are Transparent. Its use mainly includes, ECG sensors, pipettes, electrical protection devices and new medical delivery devices, such as inhalation products, including PMDI spacer.
3, spray-free modified engineering plastics
Spray-free plastic is a special pearl powder or metal pigment added to a specific resin. It is modified with special compatible technologies. Direct injection molding can achieve various pearlescent, colorful or metallic appearance effects, and successfully solve special colors. Effects Over the years, there have been difficult problems with weld lines or flow marks in injection molding products, satisfying the colorful texture, low cost and high efficiency, and environmental protection and energy saving market trends. By providing personalized customized appearance color design, consumers can have a better visual experience and safety. Environmental protection.
Compared to the traditional spray-painted plastic, spray-painted plastic one-time molding, spray painting can get gorgeous appearance of aesthetic plastic, with a greener, more environmentally friendly, lower cost, higher design freedom, fewer process issues.
4, carbon fiber modified engineering plastics
Carbon fiber modified engineering plastics to enhance the main, is based on carbon fiber or carbon fiber fabric as a reinforcement to PA / PC / ABS / PBT / PPO as the matrix formed by the composite material. Mainly used in automobile manufacturing, electrical and electronic, household appliances , Sports equipment and other areas requiring high strength, high modulus, low specific gravity, anti-static, friction and other areas, including: automotive features, printers, Yanchao Ji, electronic trays,
5, antibacterial engineering plastics
Antibacterial modified engineering plastics are plastics that inhibit or kill bacteria, molds, alcohol bacteria, algae and even viruses that are stained on plastics in the use environment. They keep themselves clean by inhibiting the reproduction of microorganisms. At present, antimicrobial plastics are mainly obtained by adding a small amount of antibacterial agent to the matrix plastic.
6, light diffusion type modified engineering plastics
The light diffusion material is generally made by adding a light diffusion agent to the transparent resin to achieve a soft light effect. The light diffusion material includes a light diffusion PC and a light diffusion PMMA. The material has characteristics of high transmittance, high haze, and good weatherability, etc. Applied in LED, electronic appliances, home appliances and other fields.
7, magnetic modified engineering plastics
Composite magnetic plastic is a plastic as a binder, supplemented by appropriate additives, mixed with the magnetic powder obtained material. Magnetic plastic is widely used in electronics, electrical, instrumentation, communications, culture, education, health and daily life In many fields, its output and demand are constantly increasing, with great potential for development.
8, thermal conductivity modified engineering plastics
Thermal conductive plastic is the use of thermally conductive fillers (including particles, fibers, plies, etc.) to uniformly fill the polymer matrix material in order to improve its thermal conductivity. Thermal conductivity is mainly used thermal conductivity (unit: W / (mk)) Measure. At present, the application of thermally conductive plastics in the LED field is the most widely used. In addition, thermally conductive plastics are also used in pipes, heat exchangers, automobiles, heating/cooling/refrigeration, etc.