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Method for preparing PVA (polyvinyl alcohol) assisted dispersant for manufacturing polyvinyl chloride by using suspension method

A polyvinyl alcohol and polyvinyl chloride technology, which is applied in the field of preparation of polyvinyl alcohol auxiliary dispersants, can solve problems such as inability to meet customer requirements more efficiently, low porosity efficiency of polyvinyl chloride resin, and post-processing difficulties. Achieve the effects of high absorption value, easier removal, and increased porosity

Active Publication Date: 2012-01-11
TIANJIN SUNNYMER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, there are two types of auxiliary dispersants at home and abroad: one is a product composed of a mixture of polyvinyl alcohols with different alcoholysis degrees with an average alcoholysis degree of about 56mole%, which can reduce the organic solvent by less than 2wt% , but this type of product is not completely soluble in water, and will be layered after being diluted with water, and the efficiency of controlling the porosity of polyvinyl chloride resin is low, which cannot meet the customer's use requirements more efficiently
The other is a commodity whose degree of alcoholysis can be lower than 50mole%, but it is sold in two states of being completely dissolved in methanol or ethanol or dissolved in water containing at least 50wt% methanol or ethanol, although it has high efficiency, However, it will cause pollution to the environment or difficulty in post-processing

Method used

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  • Method for preparing PVA (polyvinyl alcohol) assisted dispersant for manufacturing polyvinyl chloride by using suspension method
  • Method for preparing PVA (polyvinyl alcohol) assisted dispersant for manufacturing polyvinyl chloride by using suspension method
  • Method for preparing PVA (polyvinyl alcohol) assisted dispersant for manufacturing polyvinyl chloride by using suspension method

Examples

Experimental program
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Effect test

Embodiment 1

[0048] In the closed autoclave, feed nitrogen to replace the air, then add 100 parts by weight of vinyl acetate monomer, 100 parts by weight of methanol, 3.75 parts by weight of sodium methallylsulfonate, 3.5 parts by weight of ethyl Aldehyde and benzoyl peroxide based on 1.8 parts by weight of vinyl acetate monomers, heating the reactor, heating up to 40°C, and after 10 minutes, continuing to heat up to 65°C for polymerization, after the total polymerization time of 12 hours, when When the conversion rate of vinyl acetate is greater than 92%, add 10 parts by weight of methyl acetate terminator to terminate the polymerization reaction. After the polymerization reaction is completed, heat up to 70°C and distill under reduced pressure for 20 minutes to recover the residual monomers to obtain a copolymer solution for future use. ;

[0049] Add methanol to the standby copolymer solution, dilute to a solid content of 50wt%, to obtain a diluted copolymer solution, take 100 parts by ...

Embodiment 2

[0052] In the autoclave, feed nitrogen to replace the air, add 100 parts by weight of vinyl acetate monomer, 80 parts by weight of ethanol, 1.3 parts by weight of methyl vinyl ether, 0.8 parts by weight of benzaldehyde, then add 0.85 parts by weight Azobisisobutyronitrile, then warming up to 40°C for 10 minutes and then continue to heat up to 62°C for polymerization, the total reaction time is 12 hours, when the conversion rate of vinyl acetate is greater than 92%, add 15 parts by weight of terminator Methanol was used to terminate the polymerization reaction, and the temperature was raised to 70° C. for 20 minutes under reduced pressure to distill the residual monomers to obtain a polymerization solution.

[0053] Methanol was added to the polymer solution, and diluted to a solid content of 40 wt%, to obtain a diluted polymer solution. Take 100 parts by weight of the diluted polymer solution and add it to the alcoholysis tank, add 3.5 parts by weight of 98% concentrated sulfu...

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Abstract

The invention discloses a method for preparing a PVA (polyvinyl alcohol) assisted dispersant for manufacturing polyvinyl chloride by using a suspension method. The method comprises a process for preparing a copolymer solution through copolymerization of binary or multielement monomers, and an alkali or acid catalytic alcoholysis process; the polymerization degree of the prepared PVA assisted dispersant is 200-400, and the alcoholysis degree of the PVA assisted dispersant is 33-55mol%; and the assisted dispersant is totally soluble in water, and is used for the suspension polymerization of chloroethylene. The PVA assisted dispersant prepared by the method is exclusively used for the suspension polymerization process of chloroethylene; and the method disclosed by the invention is environmental-friendly and economic in cost, the performance of the obtained product is good, and a problem that a low-alcoholysis-degree assisted dispersant is not completely soluble in water is solved.

Description

technical field [0001] The present invention relates to a kind of preparation method of the auxiliary dispersant of polyvinyl chloride produced by suspension method, [0002] In particular, it relates to a preparation method of a polyvinyl alcohol auxiliary dispersant for producing polyvinyl chloride by a suspension method. Background technique [0003] Polyvinyl Chloride (PVC for short) resin is a thermoplastic polymer obtained from Vinyl Chloride (VC for short) by suspension polymerization. The particle size of PVC resin particles in the suspension polymerization method is 60 microns to 150 microns. PVC resin is a product that can be processed by high pressure, kneading, injection molding, calendering, blow molding, etc. Due to its superior performance and price, PVC resin is widely used in various fields of the national economy and is one of the world's five general-purpose thermoplastic resins. one. [0004] During the processing of PVC, in order to improve the pla...

Claims

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Application Information

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IPC IPC(8): C08F218/08C08F228/02C08F216/18C08F8/00C08F2/18C08L27/06
Inventor 卢金永
Owner TIANJIN SUNNYMER
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