Polymers are composed of many small, simple structures with small bonds that are covalently bonded. There are many kinds of polymers. Generally, if they are classified according to changes in heat, they can be divided into two categories of plastic products. Let’s take a look at them in detail today. Let’s take a look.
1. Thermosetting plastics.. refers to the combination of molecular structure into a network form after heating. Once combined into a network polymer, it will not soften even if heated, showing so-called irreversible changes, which are molecular structures. Caused by changes.
Second, thermoplastics.. refers to the plastic that melts after heating, can flow to the mold after cooling, and then melted after heating, can be heated and cooled to produce, is the so-called physical changes.
According to the application range, plastic products mainly include general-purpose plastics such as PE/PP/PVC/PS, engineering plastics such as ABS/POM/PC/PA, etc. There are also some special plastics such as high temperature resistant, high humidity and corrosion resistant. And other plastics modified for special purposes.
Plastic material utilization and color processing
1. Most of the raw materials of plastic products can be recycled. However, since the plastics used are more brittle than the general raw materials, they can only be mixed with new materials. The maximum proportion should not exceed 25%. It should be based on the principle of customer requirements. Types of plastic materials have different injection pressures due to the different melting points required, and must not be confused in production.
2, because plastic products should be matched with color, so plastic raw materials can be divided into: pumping pellets, toner materials, color materials, and the recent addition of liquid coloring in plastic raw materials. In the raw material, each plastic material has been colored, so the color of the product is stable and uniform. The color powder and the color material are used to mix the color or the toner, and the cost is low, and there is no need to store a large amount of colored raw materials. Unstable, it is difficult to control unity in production.
I believe that everyone here is clear about the classification of plastic products by raw materials. I hope this article can help you.