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Polyvinyl alcohol with advantages of defoaming function and low alcoholysis degree, and preparation method thereof

A technology of polyvinyl alcohol and alcoholysis degree, applied in the field of preparation of polyvinyl alcohol, can solve the problems of SPVC quality decline, environmental pollution, high organic content in mother liquor, and achieve the effect of cost economy

Active Publication Date: 2017-09-22
TIANJIN SUNNYMER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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., and the cost will increase;
[0005] At present, PVC factories rely on adding polyether defoamers in the process of dispersant preparation, and adding 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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  • Polyvinyl alcohol with advantages of defoaming function and low alcoholysis degree, and preparation method thereof
  • Polyvinyl alcohol with advantages of defoaming function and low alcoholysis degree, and preparation method thereof
  • Polyvinyl alcohol with advantages of defoaming function and low alcoholysis degree, and preparation method thereof

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Embodiment 1

[0034] a): In a 1-liter airtight normal-pressure polymerization kettle, feed nitrogen to replace the air, then add 100g vinyl acetate, 100g methanol solvent, and then add functional monomer B 1.75g ​​sodium methallyl sulfonate And 0.35g of tert-butyl acrylate, 3.5g of acetaldehyde, and finally 1.75g ​​of dibenzoyl peroxide. Heat the reactor, raise the temperature to 50°C and react for 10 minutes, then continue to raise the temperature to 65°C to start calculating the polymerization time. After the total reaction time is 12 hours, add 10 g of methyl acetate to terminate the polymerization. After the polymerization, the temperature was raised to 70° C. for 45 minutes under reduced pressure and the residual monomer was recovered to obtain a polyvinyl acetate solution. Adding methanol to the polyvinyl acetate polymer, diluting the solid content to 45wt%;

[0035] b): Then add 100 g of diluted polymer in a 1 liter alcoholysis tank, add 70 g of sodium hydroxide methanol solution wi...

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Abstract

The present invention belongs to the field of preparation of polyvinyl alcohol, and particularly relates to polyvinyl alcohol with advantages of defoaming function and low alcoholysis degree, and a preparation method thereof. The preparation method comprises: a) polyvinyl acetate polynary monomer copolymerization, and b) catalytic alcoholysis, wherein the copolymerization monomer used in the step a) comprise, by weight, 100 parts of polyvinyl acetate, 0.35-7.25 parts of a functional momomer B, 0.005-3.5 parts of an aldehyde monomer, 0.00025-1.25 parts of an acrylate monomer, 70-120 parts of a solvent, and 0.0025-1.75 parts of an initiator. According to the present invention, the problem that the polyvinyl alcohol with the alcoholysis degree of less than 56 mol% is insoluble in water is solved so as to make the auxiliary dispersant become the environmentally friendly product, the problem of the water phase dispersing during vinyl chloride suspension polymerization is solved, and the auxiliary dispersant has the defoaming function.

Description

technical field [0001] The invention belongs to the field of polyvinyl alcohol preparation, and in particular relates to a polyvinyl alcohol with a low degree of alcoholysis with defoaming function and a preparation method thereof. Background technique [0002] During the processing of polyvinyl chloride, in order to improve the plasticizing performance of polyvinyl chloride, it is necessary to add plasticizers. The absorption of plasticizers is related to the porosity of polyvinyl chloride particles. In the suspension polymerization of vinyl chloride, except In addition to improving the porosity by adjusting the formula of the primary (also called primary) dispersant, the most common is to add a secondary (also called auxiliary) dispersant, which can not only increase the porosity of PVC, but also make the particle distribution more precise. Uniformity is an important part of polyvinyl chloride suspension polymerization formulations in recent years; for auxiliary dispersant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F228/02C08F220/18C08F8/00C08F2/20C08F14/06
CPCC08F2/20C08F8/00C08F14/06C08F218/08C08F228/02C08F220/1804
Inventor 卢金永
Owner TIANJIN SUNNYMER
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