The plastic we usually use is not a pure substance, it is made of many materials. Among them, high molecular polymer (or synthetic resin) is the main component of plastic, in addition, in order to improve the performance of plastic, but also in the polymer to add a variety of auxiliary materials, such as fillers, plasticizers, lubricants, Coloring agent, etc., can become a good performance of plastic

1, synthetic resin

Synthetic resin is the most important component of plastic, its content in the plastic is generally 40% to 100%. Due to the large content, and the nature of the resin often determines the nature of the plastic, so people often see the plastic synonym for the plastic. For example, the polyvinyl chloride resin and PVC plastic, phenolic resin and phenolic plastic mixed with. In fact, resin and plastic are two different concepts. Resin is an unprocessed original polymer, it is not only used in the manufacture of plastic, but also paint, adhesives and synthetic fiber raw materials. The plastic in addition to a small part of the 100% resin, the vast majority of plastic, in addition to the main component of the resin, but also need to add other substances

2, packing

Fillers, also known as fillers, can improve the strength and heat resistance of plastics and reduce costs. For example, adding phenolic resin to wood powder can greatly reduce the cost of phenolic plastic to become one of the cheapest plastic, but also significantly improve the mechanical strength. Fill can be divided into two kinds of organic fillers and inorganic fillers, such as wood flour, rags, paper and a variety of fabric fibers, the latter such as glass fiber, diatomaceous earth, asbestos, carbon black

3, plasticizer

Plasticizer can increase the plasticity and flexibility of plastic, reduce the brittleness, so that the plastic easy to shape. Plasticizers are generally compatible with resin, non-toxic, odorless, light, heat stable high boiling organic compounds, the most commonly used is phthalate esters. For example, the production of PVC plastic, if you add more plasticizers can be soft PVC plastic, without or less plasticizer (dosage <10%), then="" the="" rigid="" polyvinyl="" chloride="">

4, stabilizer

In order to prevent the synthetic resin in the processing and use of light and heat during the decomposition and destruction of the role, to extend the service life, to join the stabilizer in the plastic. Commonly used stearate, epoxy resin and so on

5, coloring agent

The coloring agent allows the plastic to have a variety of bright, beautiful colors. Commonly used organic dyes and inorganic pigments as colorants.

6, lubricant

The role of the lubricant is to prevent the plastic in the molding does not stick to the metal mold, while the plastic surface can be smooth and beautiful. Commonly used lubricants are stearic acid and its calcium and magnesium salts

7, antioxidant

To prevent the plastic in the heating or high temperature in the course of the use of thermal oxidation, leaving the plastic yellow, fissure, etc.

In addition to the above additives, the plastic can also add flame retardants, foaming agents, antistatic agents, etc., to meet the different requirements