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Plastics Additives
Sep 01, 2017

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The main purpose of plastics additives in plastics is to improve the processability, improve the use efficiency and reduce the cost. The proportion of additives in plastic materials is less, but it has a great influence on the quality of plastic products. Different kinds of plastics are different in form and dosage because of their different processing methods and conditions. The main additives are as follows:

1. plasticizer

Plasticizers can increase the softness, extensibility, plasticity of plastics, reduce the flow temperature and hardness of plastics, and be beneficial to the molding of plastics. Commonly used are benzene, two formic acid esters, decyl two esters, chlorinated paraffin and camphor. Camphor is the most common of us.

2. stabilizer

We all know that plastic products in processing, storage and use process, in the light, heat and oxygen under the action of the occurrence of fading, embrittlement, cracking and aging. Stabilizers must be added to retard and prevent the ageing process. Mainly used to prevent heat aging, called heat stabilizers; mainly used to prevent oxidation aging, called antioxidants; mainly used to prevent photoaging, called light stabilizers, they collectively referred to as stabilizers. Today's most excellent plastic stabilizer is methyl tin heat stabilizer (referred to as 181). It is very effective for calendering, extrusion, injection molding and blow molding of rigid polyethylene (PVC). Because of its high safety, particularly for food packaging and high definition hard PVC products, at the same time, it has also been widely used in plastic doors and windows, water pipes, decorative materials, to replace other highly toxic plastic heat stabilizer. It has been widely used in the United States, Europe and japan. In recent years, 181 methyl tin heat stabilizers have been widely applied in china.

3. flame retardant

Additives that improve the flammability of plastics are called flame retardants. Most plastics containing flame retardants are self extinguishing or slow down in combustion rate. Commonly used flame retardants are antimony oxide, aluminum and boron compounds, halides and phosphates, four chlorobenzene, two methylene anhydride, four Australian benzene, two acid anhydride, etc..

4. antistatic agent

Antistatic agent can eliminate or reduce the static electricity produced on the surface of plastic products. Most of the antistatic agents are electrolytes, and their solubility is limited to synthetic resins, which can be transferred to the plastic surface to absorb moisture and eliminate static electricity.

5. foaming agent

A plastic foaming agent is a low molecular organic substance that can be gasified at a certain temperature, such as two chlorine two fluorine methane, or organic compounds that decompose gases when heated. These gases stay in the plastic matrix and form foam plastics with many fine foam structures. Commonly used azo compounds, nitroso compounds, and so on.

6. stain

Colouring agents used in plastics. Mainly beautifying and modifying. About 80% of plastic products are made into finished products after being stained.

7. lubricant

A lubricant is a substance added to improve the mold release and improve the surface finish of plastics during heating. Commonly used lubricants are: stearic acid and its salts, paraffin wax, synthetic wax and so on.

8. reinforced materials and fillers

In many plastics, reinforcement and fillers account for a considerable proportion, especially for plastics and calcium plastics. The main purpose is: in order to improve the strength and rigidity of plastic products, generally add various fiber materials or inorganic substances. The most commonly used reinforcement materials are glass fiber, asbestos, quartz, carbon black, silicate, calcium carbonate, metal oxides, etc..

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