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Preparation method of chloroethylene-vinyl acetate copolymer paste resins with uniform chemical compositions

A vinyl acetate copolymer and vinyl acetate technology are applied in the preparation field of vinyl chloride-vinyl acetate copolymer paste resin, and can solve the problems of poor chemical composition uniformity, low vinyl acetate content, low solubility and the like

Inactive Publication Date: 2013-08-21
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The vinyl acetate copolymer paste resin prepared by the current general mixed method polymerization process has poor chemical composition uniformity and low solubility in ketone and ester solvents, and is only suitable for the preparation of resins with low vinyl acetate content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Desalted water, vinyl acetate, vinyl chloride monomer with a total weight of 80%, compound emulsifier, initiator, pH regulator, first-generation seeds, and second-generation seeds are polymerized under anaerobic airtight conditions, and the polymerization temperature is 61 ℃, every time the pressure drops by 0.05MPa, add vinyl chloride monomer and add in 10 times until the remaining 20% ​​of vinyl chloride is added, and the polymerization time is 6 hours to obtain a vinyl chloride-vinyl acetate copolymer aqueous suspension , and then recover the unreacted vinyl chloride monomer, replace it with nitrogen, collect the emulsion, and spray dry it to obtain the vinyl chloride-vinyl acetate copolymer paste resin.

[0048] The parts by weight of each component are as follows:

[0049] Vinyl chloride monomer 100 parts

[0050] Vinyl acetate monomer 12 parts

[0051] 1 generation seed 1.2 servings

[0052] Second-generation seeds 0.6 parts

[0053] Compound emulsifier 0.9 pa...

example 1

[0077] The vinyl chloride-vinyl acetate copolymer paste resin prepared in Example 1 and the vinyl chloride-vinyl acetate copolymer paste resin prepared by a conventional polymerization process were dissolved according to the following formulas respectively. The following is the resin dissolution formula:

[0078] Vinyl vinegar paste resin: 10% (mass percentage, the same below)

[0079] Mixed solvent: MEK 75%

[0080] Butyl acetate 15%

[0081] The transparency of the two groups of solutions was visually inspected. The solution prepared by the vinyl chloride-vinyl acetate copolymer paste resin prepared in Example 1 was transparent, and the solution prepared by the vinyl chloride-vinyl acetate copolymer paste resin prepared by the conventional polymerization process was cloudy.

Embodiment 2

[0083] Desalted water, vinyl acetate, 70% vinyl chloride, compound emulsifier, initiator, pH regulator, first-generation seeds, and second-generation seeds are polymerized under anaerobic and airtight conditions. The polymerization temperature is 56 ° C, under pressure For every drop of 0.08MPa, add vinyl chloride monomer in 6 times until the remaining 30% of vinyl chloride is added. The polymerization time is 8 hours to obtain a vinyl chloride-vinyl acetate copolymer aqueous suspension, and then recover unreacted chlorine. The vinyl monomer is replaced with nitrogen, and the emulsion is collected and spray-dried to obtain a vinyl chloride-vinyl acetate copolymer paste resin.

[0084] The parts by weight of each component are as follows:

[0085] Vinyl chloride monomer 100 parts

[0086] Vinyl acetate monomer 15 parts

[0087] 1 generation seed 2.4 servings

[0088] Second-generation seeds 1.2 parts

[0089] Compound emulsifier 1.2 parts

[0090] Initiator 0.28 part

[0...

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Abstract

The invention provides a preparation method of chloroethylene-vinyl acetate copolymer paste resins with uniform chemical compositions. The method comprises the following steps of: under an anaerobic airtight condition, performing polymerization reaction on desalted water, vinyl acetate, chloroethylene with the total weight of 60-80 percent, compound emulsifier, an initiating agent, a pH conditioning agent, the first generation of seeds and the second generation of seeds for 3-12 hours at the polymerization temperature of 45-65 DEG C; adding the rest of chloroethylene monomers for 4-7 times when polymerization pressure (0.05-0.10MPa) drops every time until the polymerization conversion rate is up to 60-80 percent to obtain a chloroethylene-vinyl acetate copolymer water flotation fluid; and collecting the chloroethylene-vinyl acetate copolymer paste resins from a reaction product. According to the method, the chloroethylene monomers are added when the pressure drops in a polymerization process to maintain relative constancy of the proportions of copolymer monomers in a polymerization system so as to obtain the chloroethylene-vinyl acetate copolymer paste resins with uniform chemical compositions and high solubility.

Description

technical field [0001] The invention relates to a preparation method of vinyl chloride-vinyl acetate copolymerized paste resin. Background technique [0002] Compared with PVC paste resin, vinyl chloride-vinyl acetate copolymer resin has embedded vinyl acetate molecules in PVC molecules, and the rigid structure of closely packed vinyl chloride segments in the homopolymer has been destroyed, weakening the molecular structure. The polarity between them reduces the attractive force between molecules and changes their performance. In its application field, the main performance is: vinyl chloride-vinyl acetate copolymer paste resin has lower gel temperature and melting temperature than PVC paste resin with similar molecular weight; in addition, due to the introduction of ester groups in the molecule, it can improve plasticization. The dissolution rate of the resin to the resin can enhance the adhesion between the resin and various adhesive substrates; in terms of physical and me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/06C08F218/08C08F2/30C08F2/26
Inventor 张月芳袁茂全徐洁邓兴良黄业勤
Owner SHANGHAI CHLOR ALKALI CHEM
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