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Method for preparing vinyl chloride-vinyl acetate copolymer paste resin

A technology of vinyl acetate and vinyl chloride, which is applied in the field of preparation of vinyl chloride-vinyl acetate copolymer paste resin, can solve the problems of difficult control of process parameters, complex process, difficult quality control, etc., and achieves wide applicability, The effect of simple process and fast response

Active Publication Date: 2012-04-18
SHANGHAI CHLOR ALKALI CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the process is relatively complicated, the process parameters are difficult to control, the quality is not easy to control, and the productivity is low.

Method used

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  • Method for preparing vinyl chloride-vinyl acetate copolymer paste resin
  • Method for preparing vinyl chloride-vinyl acetate copolymer paste resin
  • Method for preparing vinyl chloride-vinyl acetate copolymer paste resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of first generation seed:

[0042] The emulsifier, pH adjuster, vinyl chloride monomer, desalted water and initiator are polymerized under anaerobic airtight conditions, the polymerization temperature is 50 ° C, and the time is 7 hours to obtain the first generation of seeds;

[0043] The first generation seed contains an emulsion with a particle size of 120nm and a weight solids content of 35%

[0044] The emulsifier is sodium dodecylbenzenesulfonate; the initiator is tert-butyl hydroperoxide;

[0045] The pH regulator is 20% ammonia by weight;

[0046] The parts by weight of each component are as follows:

[0047] 100 parts of vinyl chloride monomer, 2.0 parts of emulsifier, 0.5 part of pH regulator, 140 parts of desalted water, 0.260 parts of initiator;

[0048] The preparation method of second generation seed:

[0049] Including the following steps:

[0050] The composite emulsifier, initiator, desalinated water, pH regulator, and vinyl c...

Embodiment 2

[0065] The preparation method of the first generation seed is the same as that of Example 1. Wherein, the parts by weight of each component are as follows:

[0066] 100 parts of vinyl chloride monomer, 2.0 parts of emulsifier, 0.5 part of pH regulator, 130 parts of desalted water, 0.260 parts of initiator;

[0067] The emulsifier is nonyl aryl polyether alcohol;

[0068] The first generation seed contained an emulsion with a particle size of 110 nm and a weight solids content of 37%.

[0069] The preparation method of second generation seed is identical with embodiment 1. Wherein: the parts by weight of each component are as follows:

[0070] 100 parts of vinyl chloride monomer, 1.90 parts of composite emulsifier, 0.25 parts of initiator, 160 parts of desalted water, 0.5 part of pH regulator;

[0071] The composite emulsifier is a mixture of stearyl alcohol and sodium dihexyl thiosuccinate with a weight ratio of 1.0:0.5.

[0072] The second-generation seed contains an emu...

Embodiment 3

[0082] The preparation method of first-generation seeds and second-generation seeds is basically the same as in Example 1.

[0083] The first-generation seed is an emulsion containing particles with a particle size of 130nm and a weight solid content of 33%;

[0084] The second-generation seed is an emulsion containing particles with a particle size of 900nm and a weight solid content of 26%.

[0085] Vinyl chloride-vinyl acetate copolymer emulsion preparation method:

[0086] The compound emulsifier, initiator, desalinated water, pH regulator, first-generation seed, second-generation seed, vinyl acetate and vinyl chloride monomer are polymerized under anaerobic and closed conditions. The polymerization temperature is 47°C and the time is 8 hours, to prepare vinyl chloride-vinyl acetate copolymer water suspension, and then recover the unreacted vinyl chloride monomer, replace with nitrogen, collect the emulsion, and obtain colloidal particles with an average diameter greater ...

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Abstract

The invention discloses a method for preparing a vinyl chloride-vinyl acetate copolymer paste resin by utilizing emulsion polymerization. The method comprises the following steps: under an anaerobic airtight condition, performing polymerization reaction on a compound emulsifier, a trigger, desalted water, a pH regulator, a first generation seed, a second generation seed, a vinyl chloride monomer and a vinyl acetate monomer, thereby preparing the vinyl chloride-vinyl acetate copolymer emulsion, wherein the polrvinyl chloride emulsion is taken as the first generation seed with an emulsion grain size of 100-200nm and a solid content of 25-50%, and the polrvinyl chloride emulsion is taken as the second generation seed with the emulsion grain size of 700-1000nm and the solid content of 25-50%. According to the method, the emulsion of the first generation seed and the second generation seed are added in a copolymerizing system; the copolymer emulsion is prepared; and after the copolymer emulsion is subjected to spray drying, the vinyl chloride-vinyl acetate copolymer paste resin with lower B type paste viscosity is obtained. The method has the advantages of simple process, large controllable scope of the emulsion grain size, and wide application scope of post processing.

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. Mainly reflected in: vinyl chloride-vinyl acetate copolymer paste resin has a lower gel temperature and melting temperature (30-40°C lower) than PVC paste resin with similar molecular weight; in addition, the introduction of ester groups in the molecule can improve The dissolution rate of the plasticizer to the resin increases the adhesion of the resin to various bonding substrates. [0003] Vinyl chloride-vinyl acetate copolymer resin, as an importa...

Claims

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Application Information

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IPC IPC(8): C08F214/06C08F218/08C08F2/24
Inventor 袁茂全缪晖张月芳黄业勤林嘉平林绍梁
Owner SHANGHAI CHLOR ALKALI CHEM
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