I. Non-metallic minerals (powder materials) in the plastics industry in the role of plastic processing, adding the appropriate powder filler, can achieve the role of incremental cost reduction, but also improve or improve the physical and mechanical properties of plastic products, wear resistance, thermal properties, aging resistance, but also to overcome the plastic is not resistant to low temperature, low stiffness, easy expansion, easy creep and other shortcomings. Therefore, the filler has both incremental effect and modification effect; some fillers have activity, but also can play a complementary role. Incremental agent can make plastic products density, modulus of elasticity, compression strength, flexural strength has been improved, shrinkage becomes smaller, good dimensional stability, weaken the mechanical properties of the material and temperature dependence, reduce the cost of products; enhancer role is to make the product tensile strength, elongation at break, compression strength, shear strength, modulus of elasticity, heat deflection temperature, reduce the shrinkage of the product, improve its creep The product shrinkage rate is reduced, the creep rate is improved, the bending and creep modulus are increased, the viscoelastic yield of the load is reduced and the tensile strength is increased. Commonly used powder filler, there are calcium carbonate (light calcium, heavy calcium, colloidal calcium carbonate). In recent years, the development of the plastics industry, fillers also to the functional requirements of the development, and to the ultra-fine, ultra-fine development, the filler interface modification into active calcium carbonate, has not adapted to the requirements of the development of the plastics industry, with coupling agents to filler interface modification, has formed a broad consensus. Other fillers, such as talc, mica powder, kaolin, silica, titanium dioxide, red clay, fly ash, diatomaceous earth, glass beads, barium sulfate (calcium), quartz powder, tremolite, alumina, wollastonite, carbon black, silica-aluminum carbon black, magnesite, etc., for plastic processing has produced positive effects. Non-metallic mineral fillers have become indispensable raw materials for the plastics industry, with the progress of modification technology, the types and quantities of non-metallic mineral fillers used in plastics will rapidly expand, and according to its low price, unique performance, the advantages of significant modification effect, has an important role in the plastics industry.

Second, coupling agent modified filler in the plastics industry in order to make the composite material to achieve the expected performance, the filler surface needs to be modified to enhance its compatibility with the basic resin and bonding force. The role of coupling agent to filler interface modification is: ① improve the quality of plastic products grade; ② improve the added value of plastic products; ③ promote the development of new plastic products, the application of new technologies. At the end of the seventies, China digested and absorbed foreign technology, research and production of silane coupling agent and titanate coupling agent, the early eighties to form a small-scale production, the development of China's plastics industry has played a positive role. Subsequently, the domestic research and development and production of aluminate coupling agent, rare earth coupling agent. At present, the type of domestic coupling agent, many varieties, the application of its quality, performance should be more research. Coupling agent on the filler modification, both physical changes, but also chemical reactions, more and other technological links in plastics processing, otherwise the modification effect is good, not necessarily in the final product response to the modified effect.

1.modified filler and other technology links with the combination of plastics processing is a variety of technical conditions, plastics processing designers, operators should be good at processing a variety of technical conditions in a coordinated, reasonable combination (theory and practical combination), and pay attention to the various technical links in the processing complement each other, rather than each other; processing anomalies or product quality performance does not meet the requirements, should Realistic analysis, which is related to the quality of raw and auxiliary materials, specifications, formula design, mixing operations, equipment, molds, shaping devices and a variety of technical parameters, process conditions are set, they can affect the application of modified filler effect. Therefore, plastic modification workers to improve the quality of filler modification at the same time, should also be familiar with the whole process of plastic processing technology requirements, timely exclusion of various factors affecting the effect of filler modification, so that the product can achieve good quality performance.

2. Different resins, different fillers, different uses should choose different types of coupling agent filler is mostly inorganic, it must be taken into account and the compatibility of the base resin. Organic polymer molecular structure and physical form and inorganic materials (powder filler) is not the same, two different structures of materials can not be combined together, the choice of coupling agent with amphoteric groups, through the chemical chain or winding the filler and resin closely and firmly combined.