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Self-defoaming polyvinyl alcohol prepared through chemical modification, and preparation method thereof

A polyvinyl alcohol, chemical modification technology, applied in the field of modified polyvinyl alcohol, chemically modified polyvinyl alcohol with defoaming function, can solve the problems of SPVC quality decline, fish eye number increase, output reduction, etc., to achieve The effect of reducing the pressure of sewage treatment, regular physical form, and advanced processing performance

Inactive Publication Date: 2017-09-22
TIANJIN SUNNYMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The generation of foam will seriously block the condenser of the vinyl chloride suspension polymerization device, which will bring the following consequences: for example: the quality of SPVC will decrease, the output will decrease, the whiteness value will decrease, the number of fish eyes will increase, etc.; increase the cost;
[0007] At present, PVC factories rely on the addition of polyether defoamers in the process of dispersant preparation, and silicone oil defoamers in the stripping stage to solve the problem, which brings increased costs, decline in SPVC quality, and high organic content in mother liquor water , Many problems of potential environmental pollution

Method used

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  • Self-defoaming polyvinyl alcohol prepared through chemical modification, and preparation method thereof
  • Self-defoaming polyvinyl alcohol prepared through chemical modification, and preparation method thereof
  • Self-defoaming polyvinyl alcohol prepared through chemical modification, and preparation method thereof

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Embodiment 1

[0034] After replacing the air with nitrogen in a 2-liter stirred polymerization tank, add 100g of vinyl acetate (VAM), 80g of methanol, 1.5g of acetaldehyde, 2.5g of isopropyl acrylate and 1g of α, α-azo Diisoheptylnitrile was used as the initiator. Start stirring, heat the reactor, heat up to 55°C for 10 minutes and then heat up to 65°C for polymerization, then inject 40 g of methanol solution containing 0.5wt% α, α-azobisisoheptanonitrile through a syringe pump, and the injection time is 6 hours, the total reaction time was terminated after 12 hours. After the polymerization, the temperature is raised to evaporate and recover methanol and residual monomers. Methanol was added to the reaction mixture to adjust the content to 30.0 wt%, to obtain polyvinyl acetate (PVAc) to be alcoholysed. Add 100g polyvinyl acetate (PVAc) in a 2 liter tool stirring alcoholysis tank, add 1.25% sodium hydroxide methanol solution equivalent to 8.5 parts by weight of polyvinyl acetate as a cata...

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Abstract

The present invention relates to a chemical industry product and a preparation method thereof, particularly to a method for chemically modified self-defoaming polyvinyl alcohol, and modified polyvinyl alcohol. The preparation method comprises: a) polyvinyl acetate polynary monomer copolymerization, and b) catalytic alcoholysis, wherein the components used in the step b) catalytic alcoholysis comprise 100 parts of the alcohol solution of polyvinyl acetate, 0.7-21.5 parts of an acid / alkali catalyst, and 40-150 parts of a n-alkane compound. According to the present invention, the polyvinyl alcohol adopted as the dispersing agent of the vinyl chloride suspension polymerization can provide the defoaming effect in the polymerization system, can reduce or eliminate the additional defoamer, cannot produce a lot of foams during the polymerization process, can make polyvinyl chloride (SPVC) have characteristics of uniform particles and regular physical form, and has advanced processing performance.

Description

technical field [0001] The invention relates to a chemical product and its preparation, in particular to a method for chemically modifying polyvinyl alcohol with defoaming function and the modified polyvinyl alcohol. Background technique [0002] In the suspension polymerization of vinyl chloride, cellulose ethers and partially alcoholyzed polyvinyl alcohol are used as dispersants. Due to the characteristics of such dispersants, a large amount of foam will be generated due to the stirring of air and the vaporization of vinyl chloride monomer. [0003] The suspension polymerization of vinyl chloride is plagued by many problems, foam being one of the biggest. As polyvinyl chloride (SPVC) manufacturers strive to continuously increase productivity to increase output while reducing costs, process improvements amplify additional problems that already exist. [0004] Many manufacturers have retrofitted reactor condensers to increase the rate of heat removal in order to increase pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F220/18C08F8/00C08F14/06C08F2/20
CPCC08F8/00C08F14/06C08F218/08C08F2/20C08F220/1803
Inventor 卢金永
Owner TIANJIN SUNNYMER
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