1. The main component of plastic raw materials is resin

2.Plastic raw material: It is made of polymer synthetic resin (polymer) as the main ingredient and penetrates into various auxiliary materials or additives. It has plasticity and fluidity under specific temperature and pressure, can be molded into a certain shape, and under certain conditions Under the shape of the material.

3. Polymer: refers to the pure material or polymer material produced during the polymerization process. Both natural resins and synthetic resins are polymer aggregates, referred to as high polymers.

4.Plastic has good insulation properties for electricity, heat and sound: electrical insulation, arc resistance, heat insulation, sound insulation, sound absorption, vibration absorption, and excellent sound insulation performance.

Most of the plastic raw materials are extracted from some oils. The most familiar part of the PC material is extracted from petroleum. The PC material has a smell of gasoline when it is burned. ABS is extracted from coal. ABS is When burnt out, it will be soot-like; POM is extracted from natural gas. When burned out, POM will have a very smelly gas.

Characteristics of general plastic raw materials

a. Plastic raw materials expand by heat, and the coefficient of linear expansion is much larger than that of metal;

b. The stiffness of general plastic materials is an order of magnitude lower than that of metals;

c. The mechanical properties of plastic materials will be significantly reduced under long-term heating;

d. General plastic raw materials will be permanently deformed under long-term stress at room temperature and stress lower than their yield strength;

e. Plastic materials are very sensitive to notch damage;

f. The mechanical properties of plastic materials are usually much lower than those of metals, but the specific strength and specific modulus of some composite materials are higher than those of metals. If the product design is reasonable, it will be more effective;

g. Generally, the mechanical properties of reinforced plastic raw materials are anisotropic;

h. Some plastic materials will absorb moisture and cause changes in size and performance;

i. some plastics are flammable;

j. Fatigue data of plastic raw materials are still very few, and need to be considered according to the requirements of use.

Rubber raw material classification

According to the molecular structure of synthetic resins, plastic raw materials are mainly divided into thermoplastic and thermosetting plastics: for thermoplastics, plastics that are still plastic after repeated heating: mainly PE / PP / PVC / PS / ABS / PMMA / POM / PC / PA Thermoset plastics are mainly plastics made from heat-hardened synthetic resins, like some phenolic plastics and amino plastics, which are not commonly used.

According to the scope of application, there are mainly general plastics such as PE / PP / PVC / PS, etc., engineering plastics such as ABS / POM / PC / PA, etc., and some special plastics such as high temperature and humidity resistance, corrosion resistance and others. Some plastics modified for special purposes.

Material utilization and color treatment

1. Most of the plastic raw materials can be recycled, but because the used plastics (eating materials) are more brittle than general raw materials, they can only be mixed with new materials (raw materials). The maximum proportion cannot exceed 25%. It is appropriate to meet customer requirements. The standard is the principle. Different types of plastic materials must not be confused in production due to the different melting points and different injection pressures.

2. Because plastic products must be matched with color, plastic raw materials can be divided into: pumping granules, toners, color seeds, and recently added liquids to color in plastic raw materials. Pumping raw materials are pigments that have been mixed Into the raw materials, each piece of plastic material has been colored, so the product color is stable and uniform. Toner materials and color seed materials are mixed with color seeds or toner mixed raw materials, which has low cost and does not need to store a large amount of colored raw materials. Unstable and difficult to control in production