Preparation method of vinyl pyrrolidone-vinyl acetate copolymer

A technology for the copolymerization of vinylpyrrolidone and vinyl acetate, which is applied in the field of preparation of vinylpyrrolidone and vinyl acetate copolymers, can solve problems such as inaccessibility, and achieve the effects of low cost, high efficiency and simple steps

Inactive Publication Date: 2015-01-14
重庆斯泰克瑞登梅尔材料技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the above-mentioned prior art, it is impossible to achieve this standard

Method used

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  • Preparation method of vinyl pyrrolidone-vinyl acetate copolymer
  • Preparation method of vinyl pyrrolidone-vinyl acetate copolymer

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Embodiment Construction

[0025] The common method used by those skilled in the art to prepare vinylpyrrolidone and vinyl acetate copolymer is to use ethanol, N-vinylpyrrolidone and vinyl acetate as raw materials, and then carry out polymerization reaction, wherein ethanol, N-vinylpyrrolidone and vinyl acetate The ratio of the amount between is determined according to actual needs, and can be any ratio. Of course, in the preparation method of the vinylpyrrolidone-vinyl acetate copolymer of the present invention, the ratio of ethanol, N-vinylpyrrolidone and vinyl acetate can still be any ratio. The process of preparing vinylpyrrolidone-vinyl acetate copolymer by using ethanol, N-vinylpyrrolidone and vinyl acetate in the prior art can also be applied to the present invention.

[0026] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0027] The preparation method of the vinylpyrrolidone-vinyl acetate copolymer of the present invention refers...

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Abstract

The invention discloses a preparation method of a vinyl pyrrolidone-vinyl acetate copolymer. The method at least comprises the following steps: adding a reaction solution containing N-vinyl-2-pyrrolidone, vinyl acetate and ethanol into a polymerization kettle; thoroughly mixing the reaction solution; adding an azo initiator into the reaction solution to initiate the polymerization reaction between the N-vinyl-2-pyrrolidone and vinyl acetate, wherein the temperature of the reaction solution is controlled at 55-73 DEG C, and the reaction time is 4-5 hours; adding a preset amount of formic acid into the reaction solution to eliminate residues, thereby decomposing the N-vinyl-2-pyrrolidone into acetaldehyde and 2-pyrrolidone. The method has the advantages of simple steps, low cost and high efficiency, and can ensure the quality requirements for the vinyl pyrrolidone-vinyl acetate copolymer.

Description

technical field [0001] The invention relates to a preparation method of vinylpyrrolidone-vinyl acetate copolymer. Background technique [0002] The current methods for preparing vinylpyrrolidone-vinyl acetate copolymers include free-radical bulk copolymerization, emulsion copolymerization, and solution copolymerization. The most widely used way to prepare vinylpyrrolidone-vinyl acetate copolymers in the industry is to carry out polymerization in organic solvents in the presence of free radical initiators. Specifically, the most adopted method to prepare vinylpyrrolidone-vinyl acetate copolymer is to add ethanol, vinylpyrrolidone and vinyl acetate into the reaction kettle, and then add an azo initiator to initiate the reaction. [0003] Among them, azo initiators refer to a class of free radical initiators containing nitrogen-nitrogen double bonds in their molecular structures, including oil-soluble, water-soluble and oil-water-soluble three categories. Oil-soluble azo init...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/10C08F218/08C08F8/00
Inventor 罗少敏
Owner 重庆斯泰克瑞登梅尔材料技术有限公司
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