What is plastic and what are its main components?

What is plastic and what are its main components?

The original meaning of English word "Plastice" is a material or plastic material from which various shapes can be freely kneaded.

The main component is a synthetic or natural polymer compound that can be plasticized and shaped under certain conditions, and final product can retain its previous shape.

In addition to polymer compound matrix (also called polymer) called resin, plastics also contain many additives for special purposes:

1. Synthetic resin

Synthetic resin (abbreviated resin) is a synthetic high molecular weight compound, also known as a high molecular weight polymer. It is most basic and important part of plastics. It defines basic properties of plastics. All types of plastics are based on resin im.

About 40%~100% plastic.

One of main functions of resin is to bind various additives into a single whole and give it certain physical and mechanical properties.

There are many types of resins with different properties.

The requirements for selection of plastics are mainly related to factors such as molecular weight, particles, structure, and difficulty of interacting with additives.

There are hundreds of types of plastics made up of various resins, such as PE, PA, PVC, PC, PP, PF, EP, NP and other thermosetting plastics.

2. Addition

Additives are substances added to improve performance or processing efficiency of plastics, also called additives.

It does not affect chemical structure of resin, but is dispersed in resin in physical form, forming a multi-phase or micro-multi-phase structure.

There are many types of additives with different functions:

2.1: Only with good resin compatibility can it exist in product for a long time, stably and uniformly, efficiently and highly perform its functions. Otherwise, “cracks”, “blooming” easily appear. "and other phenomena.

However, for some products with less stringent requirements, compatibility requirements are not too high, such as compatibility between filler and resin is very poor, but due to small particle size, it can still basically meet performance. product requirements.

2.2: Good stability. The addition of additives is intended to improve and improve certain properties, therefore, additives are required to be able to stably maintain their original state and not change properties as a result of processing and use, thus losing their original properties and leading to a deterioration in product properties.

2.3: Additives that meet processing requirements are injected into mold cavity along with resin. Some resins have harsh processing conditions, such as high plasticizing temperature. At this time, consider whether additive will decompose at this temperature, which will affectto form. Whether equipment is corrosive.

In real production, quite a lot of additives are used, mainly including: fillers, plasticizers, stabilizers, reinforcing additives, lubricants, antistatic agents, dyes, flame retardants, fragrances, foaming agents, bleaches, bleaches and much more!

What is plastic and what are its main components?
What is plastic and what are its main components?