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In today's article, Qingdao sainuo pe wax manufacturer will take you to learn about the blending modification of plastics.
Polymer blend refers to the mixture of two or more homopolymers or copolymers. The polymer components in polymer blends are mainly physically combined, so polymer blends are different from copolymerized polymers. However, in polymer blends, it is inevitable that a small amount of chemical bonds exist between different polymer macromolecules. For example, in the process of melt mixing under strong shear force, macromolecules may break due to shear, resulting in macromolecular free radicals, so as to form a small amount of block or graft copolymers. In addition, the reactive compatibilization measures adopted in recent years to strengthen the interfacial bonding between the components of blended polymers must also introduce chemical bonds between the components.
There are many types of polymer blends, but generally refers to the blends of plastics and plastics and the mixing of rubber in plastics. For the blend system mixed with a small amount of rubber in plastics, it is generally called rubber toughened plastics because of its great improvement in impact properties. The types of polymer blends can be divided into binary and multicomponent polymer blends according to the content of polymer components; According to the name of matrix resin in polymer blends, it can be divided into polyolefin blends, polyvinyl chloride blends, polycarbonate blends, polyamide blends, etc; According to the performance characteristics, there are polymer blends such as high temperature resistance, low temperature resistance, flame retardant and aging resistance.
Although plastics have many excellent properties, they have many disadvantages compared with metal materials. In some fields with high requirements for comprehensive properties, a single plastic is difficult to meet the requirements. Therefore, the purpose of blending modified plastics is as follows.
① Improve the comprehensive properties of plastics.
② Improve the mechanical properties of plastics, such as strength, low temperature toughness, etc.
③ Improve the heat resistance of plastics. The thermal deformation temperature of most plastics is not high. For some parts working at a certain temperature, general plastics are not competent.
④ Improve processing performance. For example, the molding processability of PPO is poor, and its processing fluidity is greatly improved after PS modification.
⑤ Reduce water absorption and improve dimensional stability of products. For example, the water absorption of polyamide is large, resulting in the size change of products.
⑥ Improve the combustion resistance of plastics. Most plastics are flammable materials, which have low safety for electrical and electronic equipment. The safety of materials is improved through flame retardant modification.
⑦ Reduce the cost of materials. The price of plastics, especially engineering plastics, is high. The blending modification of general plastics and engineering plastics not only reduces the cost of materials, but also improves the molding processability.
⑧ Realize the functionalization of plastics and improve their performance. For example, plastics have low conductivity. For some applications that need anti-static and conductive, they can be blended with conductive polymers to obtain plastic materials with anti-static function, conductive function and electromagnetic shielding function, so as to meet the requirements of electronics, household appliances, communication, military, etc.
In short, blending modification can improve the comprehensive properties of plastics, increase the varieties of plastics under the condition of relatively low investment, expand the use of plastics, reduce the cost of plastics, realize the high-performance, refinement, functionalization, specialization and serialization of plastics, promote the development of plastics industry and polymer material industry, and promote the development of automobile, electronics, electricity The development of high-tech industries such as home appliances, communications, military, aerospace and so on.
Qingdao Sainuo Chemical Co., Ltd. We are manufacturer of PE wax, PP wax, OPE wax, EVA wax, PEMA, EBS, Zinc/Calcium Stearate…. Our products have passed the REACH, ROHS, PAHS, FDA testing.
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