01%. Polypropylene is a non-toxic, odorless, tasteless milk white crystalline polymer, is one of the lightest varieties of all plastic.It is particularly stable to water, water absorption rate of only 0. 01%. At the same time, it has good heat resistance, products can be sterilized at temperatures above 100 ℃, without external conditions, 150 ℃ nor deformation, but if you want to use at higher temperatures and inevitable To be subject to external interference, then there will be warping deformation and other issues, then you need to be heat-resistant just just modified.Generally speaking, PP just just heat-resistant modified methods are the following:
Fill modification
Fill modification generally refers to the PP resin added calcium carbonate, talc, mica powder, kaolin, wollastonite, barium sulfate and other non-metallic ore powder material or other materials, not only can significantly improve the rigidity of PP, heat resistance , Improve dimensional stability, high temperature creep resistance, hardness, etc., most can also play an incremental role in reducing costs.
In the filling modification, we must first solve the filler in the PP resin matrix distribution, the problem of uniform dispersion, while the filler to be properly surface treated with polypropylene to produce better affinity. It can be said that the filler Surface treatment methods and the choice of surface treatment agent is the key to determine the success or failure of filling modification.Nowadays, many packing manufacturers have been able to provide different specifications according to customer requirements for selection.If the higher the quality requirements of products, you can choose to fill Masterbatch.
Enhance the modification
Reinforcement generally refers to the addition of fibrous materials to PP to increase their strength, although fillers, especially those of large diameter to thickness ratio, have the same effect.Fibrous materials used to reinforce PP are mainly glass fibers, carbon fibers, Inorganic and metallic whiskers, etc. Among them, glass fiber is the main reinforcement material, can significantly improve the PP plastic tensile strength, flexural strength and modulus (rigidity), heat resistance, dimensional stability, etc. Glass fiber reinforced PP It can be used as engineering plastics on many occasions such as fan blades, heater grilles, impeller pumps, lampshades, electric furnaces and heater housings, etc. Today, the popular long glass fiber reinforced PP.
Nucleation modification
Nucleation modification generally refers to adding a small amount of nucleating agent in PP to significantly improve the crystallization rate of PP, the crystallization rate and the crystallization of sub-micro-than just to achieve the just heat-resistant PP modified PP nucleating agent superfine talc , Silica, nano-calcium carbonate and other inorganic nucleating agents and sorbitol and its derivatives as an organic nucleating agent.Inorganic nucleating agents tend to gloss and transparency of the product to some extent, and the organic nucleating agent Significantly improve product transparency and surface gloss.
With the continuous improvement of people's living standards, they inevitably bring about changes and demands in various fields such as culture, entertainment, food, medical care, materials and living room decoration, and many articles in the market are increasingly using transparent materials. Ordinary PP, PVC, PET, PS and so on are more unique, with more advantages and development prospects. In 2016, the consumption of transparent PP in China was about 1.2 million tons, belonging to one of the PP categories with rapid growth in demand in recent years.