Preparation method of high-impact polyacrylate grafting vinyl chloride emulsion copolymer resin

Abstract

The invention relates to the technical field of vinyl chloride resin, in particular to a preparation method of high-impact polyacrylate grafting vinyl chloride emulsion copolymer resin. A single emulsifier and a single initiator are adopted by the original synthesis process, and tests proof that the single emulsifier can enable polymer latex not to be stable, and therefore, a stable polymerization product can not be obtained; the single initiator enables a polymerization system not to be stable, and reaction is difficult to control; freezing demulsification, filtering, washing, drying and the like are adopted as treatment processes of a vinyl chloride grafting copolymer emulsion to form a thick and big aggregated particle structure, and the product performance is low; moreover, much wastewater and many waste residues are generated in the process. In the invention, the stability of the latex is ensured by adopting a compound emulsifier and a compound initiator, which ensures that the latex has better average particle diameter, the polymerization system is stable and the reaction is easy to control; centrifugal spray drying is adopted to treat emulsion resin, and thereby, a good resin product with even particle size distribution and good processing performance can be obtained; and the wastewater and the waste residues are not generated, the process flow is short and the energy can be saved and the consumption can be lowered.

Description

technical field [0001] The invention relates to the technical field of vinyl chloride resin, in particular to a production method of high-impact polyacrylate grafted vinyl chloride emulsion copolymer resin. Background technique [0002] my country is a large PVC production and consumption country. With the continuous improvement of people's living standards, the demand for PVC products has grown rapidly, and at the same time, it has driven the growth of the demand for PVC impact modifier ACR. However, the proportion of low-end resin products in my country is relatively large, and high-end products mainly rely on imports (such as ACR, CPE, MBS, CPVC, etc.), while PVC products added with ACR have good aging resistance, a wide range of applications, and develop rapidly. In the United States, the amount of ACR has surpassed MBS, becoming the largest impact modifier for polyvinyl chloride resin. However, due to the constraints of technology and raw materials, the development of ...

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Problems solved by technology

However, if this emulsifier is used alone, the total concentration of emulsifier required by the polymerization system is very large, and a paste resin with good performance cannot be obtained.

[0005] 2. In the synthesis process of high-impact polyacrylate grafted vinyl chloride copolymer resin, a single initiator is used. The production experiment proves that the single initiator makes the polymerization system unstable and the reaction is difficult to control. The particle size distribution of the final product Relatively wide, poor processing performance

[0006] 3. The treatment process of p-vinyl chloride graft copolymer emulsion adopts freezing demulsification, filtration, washing, drying, etc., forming a coarse agglomerated particle structure, and the product performance is low

[0007] 4. In the process of synthesizing the seed emulsion, a three-step preparation method is adopted, the process is long, the operation is complicated, and it is not easy to carry out industrial promotion and application

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