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[Chemical Knowledge]：The production process and preparation method of acrylonitrile-butadiene-styrene copolymer ABS.

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ABS copolymer is a highly durable plastic widely used in industry and everyday life. It is composed of acrylonitrile, butadiene and styrene. Its unique chemical properties make it an important material for many products such as automobiles, furniture, toys, and electrical appliances. This article will introduce the production process and preparation method of ABS copolymer.

1. production process
The production process of
ABS copolymer generally includes the following steps:

1. Raw material inspection: three monomers (acrylonitrile, butadiene, styrene) are inspected to ensure that the quality meets the requirements.

2. Monomer pretreatment: Three monomers are added to the reactor for pretreatment, which mainly includes heating, exhaust, filtrate and other steps to purify the monomer and remove water and impurities.

3. reaction synthesis: the pretreated monomer is added to the reaction kettle, and the initiator, catalyst, etc. are added to carry out the polymer chemical reaction, so that the monomer molecular chains are crosslinked to form ABS copolymer.

4. Refining preparation: the ABS copolymer obtained after the reaction is refined, molded, pelletized and other steps to obtain a finished product that meets the requirements.

2. Preparation Methods

The preparation methods of ABS copolymers can be divided into two categories: solution polymerization and emulsion polymerization.

1. Solution polymerization method: the three monomers are dissolved in an organic solvent, and an initiator, a catalyst, etc. are added to carry out the polymerization reaction. This method is simple to operate, the formula is easy to adjust, but will produce a large amount of organic solvent waste, there is a problem of environmental pollution.

2. emulsion polymerization: three kinds of monomers and surfactants and other additives dissolved in water to form an emulsion, and then add initiator, catalyst, etc., polymerization reaction. This method produces less waste and less pollution to the environment, but the operation is more complicated and the stability of the emulsion is more difficult to adjust.

selection of preparation methods should be based on actual needs and production conditions for a reasonable choice.

3. quality requirements

ABS copolymer quality requirements mainly include the following aspects:

1. Physical properties: ABS copolymer should have good mechanical properties, thermal stability, corrosion resistance, etc.

2. Appearance of finished product: The appearance of ABS copolymer should be smooth and uniform in color.

3. Finished product size: The finished product size of ABS copolymer should meet the requirements and have certain dimensional stability.

4. Other indicators: such as solubility, fluidity, surface hardness, surface gloss, etc. The production process and preparation method of

ABS copolymer should be based on actual requirements and adopt scientific and reasonable methods to ensure product quality.