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Method for preparing carboxylic acid-modified vinyl chloride-vinyl acetate copolymer resins

A technology of vinyl acetate copolymer resin and vinyl acetate, which is applied in the field of preparation of carboxylic acid modified vinyl chloride-vinyl acetate copolymer resin, can solve the problems of difficult copolymerization reaction and difficult full contact, etc., and achieves the improvement of compatibility and Adhesive force, elimination of peeling, effect of clean production

Active Publication Date: 2009-01-07
SHANGHAI CHLOR ALKALI CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of medium water, unsaturated acids (acid anhydrides) are soluble in water, and are different from vinyl chloride and vinyl acetate oil phases, so it is difficult to fully contact and copolymerization is not easy to occur

Method used

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  • Method for preparing carboxylic acid-modified vinyl chloride-vinyl acetate copolymer resins
  • Method for preparing carboxylic acid-modified vinyl chloride-vinyl acetate copolymer resins
  • Method for preparing carboxylic acid-modified vinyl chloride-vinyl acetate copolymer resins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Weigh 25g of fumaric acid and 50g of ethanol into a 250ml three-neck flask, heat up to 65°C, stir and react for 2.0hr to obtain a fumaric esterification reaction product, and put it into a 10L high-pressure polymerization kettle;

[0038] The second step: add 300g vinyl acetate monomer, 3500g water, 2.0g polyvinyl alcohol with alcoholysis degree of 75%, 3.0g hydroxypropyl methylcellulose, weight concentration of 20% polyvinyl alcohol in a 10L polymerization kettle. 0.20g mercaptoethanol, 0.50g ammonium bicarbonate and 1200g vinyl chloride monomer, initiator peroxide di-(3,5,5-trimethylhexyl) 0.80g and 0.40g neodecanoate tert-butyl peroxide, The temperature was raised to 65°C, and the polymerization reaction was carried out at a pressure of 0.88Mpa;

[0039] Step 3: Polymerize for 1.5hr. At this time, the conversion rate of vinyl chloride is 20%. Add 0.50g of mercaptoethanol aqueous solution with a weight concentration of 0.15%, and finish adding within 2 hours. ...

Embodiment 2

[0041] The first step is the same as in Example 1; in the second step, 500g of vinyl acetate monomer and 1250g of vinyl chloride monomer are added simultaneously in a 10L polymerization kettle, and other processes are the same as in Example 1, and the pressure is 0.76Mpa; in the third step, polymerization is 1.5hr , continuously add 250g vinyl chloride monomer, keep the pressure constant until the monomer is added, other processes are the same as in Example 1.

Embodiment 3

[0043] Step 1: Weigh 10g of fumaric acid and 30g of ethanol into a 100ml three-neck flask, heat up to 65°C, stir and react for 2.0hr to obtain a fumaric esterification reaction product, and put it into a 10L high-pressure polymerization kettle;

[0044] The second step and the third step process are the same as in Example 1.

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Abstract

The invention provides a preparation method of vinyl chloride-vinyl acetate copolymer resin modified by carboxylic acid, which comprises the following steps: carrying out polymerization reaction of water, 60 to 90% the total amount of vinyl chloride, vinyl acetate, unsaturated single alkyl diacid ester or acrylic acid monomer, a dispersant, a link transfer agent, a pH buffer and an initiator at 50 to 70 DEG C and under the pressure of 0.5 to 1.2 MPa; starting to continuously add the balancing amount of vinyl chloride after the conversion rate of vinyl chloride is 15 to 20%; adding a reaction termination agent when the conversion rate of vinyl chloride is 75 to 85%; and collecting the target product from the reaction result. The method can successfully introduce carboxyl into a polymer link in a water phase environment through the structural transformation of unsaturated acid (anhydride) to eliminate the normal phenomena between a coating and a substrate such as stripping off, falling off and wrinkling, thereby improving each performance of the coating. The method uses no organic solvent and adopts a water phase suspension process to meet the requirements of clean production and environmental protection.

Description

technical field [0001] The present invention relates to adopting the method for preparing carboxylic acid modified vinyl chloride-vinyl acetate copolymer resin by suspension polymerization method, unsaturated dibasic acid (anhydride) and C 2 -C 6 Alkyl unit alcohol esterification reaction to prepare unsaturated acid monoalkyl ester, unsaturated acid monoalkyl ester or acrylic monomer and vinyl chloride (VC), vinyl acetate (VAc) suspension polymerization in water phase, A vinyl chloride-vinyl acetate copolymer containing carboxyl groups in the molecular chain is prepared. Background technique [0002] Vinyl chloride-vinyl acetate copolymer is a polymer obtained by copolymerizing vinyl chloride mainly with vinyl acetate (or adding a third monomer), collectively referred to as vinyl chloride-vinyl acetate copolymer. Because of its simple process and excellent performance, it is widely used in floor tiles, paints, inks, records, tapes and other adhesives. [0003] According t...

Claims

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Application Information

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IPC IPC(8): C08F214/06C08F222/10C08F220/06C08F2/18C08F218/08
Inventor 缪晖袁茂全林嘉平林绍梁张月芳张龙弟
Owner SHANGHAI CHLOR ALKALI CHEM
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