Recycled plastics are increasingly used in industrial, agricultural and consumer products due to their wide range of uses and their wide variety of recyclables, therefore inevitably entrapping plastics such as vinyl chloride, hydrogen sulfide, sulfur dioxide, amines , Ammonia smell, oil smell, coke smell, pesticide smell or other peculiar smell. These harmful smells and odors not only seriously affect the production environment, but also reduce product quality and product grade, and meanwhile pose a potential hazard to the environment and human beings. The complete elimination of these noxious odors and odors is a pressing and very troublesome problem for every waste recycled plastic manufacturer.
Recycled plastic granulation after the reasons for the smell:
1 more complicated materials
2. Material processing degradation
3. Material decomposition of small molecular materials.
4. Sometimes water and some materials play a very strong role in accelerating degradation.
Plastic deodorant is one For the removal or reduction of various plastics in the processing of acids, phenols, esters, aldehydes and other additives.Due to the chemical composition of different varieties of different plastics, according to the chemical characteristics of different plastics, there is a corresponding Of the deodorant additives Deodorant is conducive to improving the environmental protection of plastic products, while helping to improve the production environment of plastics for the comprehensive utilization of recycled plastics resources are of great help.
Plastic deodorant types:
In addition to the following types of flavors: physical deodorant, chemical deodorant, microbiological deodorant, plant deodorant and so on.
Physical deodorant
Physical deodorant is the physical removal of odor, the use of deodorant or odor gas physical properties, does not change the results of gas components, only to change its local concentration, or relative concentration of common adsorption deodorant , Masking deodorant and so on.
Chemical deodorant
Chemical deodorant is the use of oxidation, reduction and decomposition, neutralization reaction, addition reaction, condensation reaction, ion exchange reaction will be generated by the odor-free substances into non-odor substances to eliminate odor.
a, oxidation deodorant
NaClO, chlorine and other oxidants smell of organic sulfur and organic amines and other substances into light odor or higher solubility compounds, and then acid and alkali absorption and purification.
b, salt compounds
The use of salt compounds as deodorants, for example, ferrous iron and ascorbic acid together inhibit oxidation and react with off-flavor substances such as ammonia, mercaptan and the like to make them odorless; trivalent iron derivatives, metal complex compounds Displacement of thiol or sulfur occurs in the body and transforms off-flavor substances into odor-free substances.
c, acid, alkali preparation
The use of acids or bases as deodorant, such as zinc oxide and hydrogen sulfide uncatalyzed gas-solid two-phase reaction can be removed from the air of hydrogen sulfide gas; Flavonoids and tannins and other wood essential oil components by inclusion, Neutralization, addition reaction to remove odorous substances.
Microbial deodorant
Microbial deodorant its basic principle is the use of microorganisms to dissolve the water in the odor of substances absorbed in the body itself, through microbial metabolic activity to degrade a process of microbial deodorization can be divided into three stages: ① odor gas Dissolution process, that is, the gas phase is transferred to the liquid phase; (2) the odor component in the aqueous solution is adsorbed and absorbed by the microorganism; (3) the odor component that enters the microbial cell is decomposed and utilized by the microorganism as the nutrient substance to remove the pollutant.
The use of modern bio-engineering technology to chitosan and plant fiber extract of the compatibility of drugs made of biological deodorant, not only a high content of chitin natural non-toxic bio-polymer, and containing 200 A variety of organic and bacteriostatic plant leachate, it has a very strong bactericidal, disinfection and odor removal function. Chitosan biological deodorant odor principle is the use of microorganisms to dissolve water odor substances absorbed in the body itself, The process of microbial degradation through its metabolic activity.
Plant-based deodorant
The juice is extracted from pure natural plant and emulsified by advanced microemulsification technology to form a transparent aqueous solution, which is non-toxic, non-explosive, non-flammable and non-irritating etc. The deodorization mechanism of natural plant extracts combines adsorption, Catalytic oxidation and other technologies.
Plastic deodorant in the scope and amount of application:
1, the scope of application:
Plastic deodorant is suitable for the processing of various macromolecular materials and has special effects on the smell of macromolecule materials that are easily decomposed in the process of processing.
2, recommended dosage:
The amount of PVC, PVDC products for the plastic raw materials 1 to 0.1%, under special circumstances (such as a large proportion of plasticizer odor) to be tested.
For ABS, PA6, PP, PET, PS and other plastic raw materials for the amount of plastic raw materials used in 0.1% -0.01% between the specific test to determine.