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[Chemical Knowledge]：MBS manufacturing methods and processes.

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MBS(Methyl Methacrylate-Butadiene-Styrene) is a common raw material for chemical production, which is widely used in plastic modification, coatings, adhesives and other fields. The following is the manufacturing method of MBS:

1. Ingredient

First, methyl methacrylate (MMA), butadiene and styrene need to be compounded in a certain proportion. In general, the mass ratio of MMA, butadiene, and styrene is 50% to 70%, 20% to 40%, and 10% to 30%.

2. Emulsion polymerization

The prepared raw materials are added into the reactor, and additives such as initiator and emulsifier are added to carry out emulsion polymerization reaction. The emulsion polymerization can be carried out at a lower temperature, and at the same time a higher molecular weight and a narrower molecular weight distribution can be obtained.

3. demulsification, washing, drying

polymer emulsion through demulsification, washing, drying and other processes, MBS powder is obtained. Demulsification is generally carried out by adding salt or acid to precipitate the polymer in the emulsion. Washing is to remove residual emulsifier and other impurities, and drying is to remove water from the MBS powder.

4. Extrusion Granulation

The dried MBS powder is plasticized by an extruder, and then subjected to steps such as water cooling and pelletizing to obtain MBS granules.

In general, the manufacturing method of MBS is not complicated, but it requires a certain degree of chemical knowledge and technology. At the same time, in order to ensure the quality and stability of the product, it is necessary to strictly control the process parameters of each process and the quality of raw materials.

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