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Closely spherical blending resin of vinyl chloride-vinyl acetate copolymer and preparation method thereof

A vinyl acetate copolymer resin and vinyl acetate technology, which is applied in the field of preparing compact spherical vinyl chloride-vinyl acetate copolymer blended resin by suspension method, can solve the problem of surface collapse of vinyl chloride-vinyl acetate copolymer blended resin particles, Unable to prepare vinyl chloride-vinyl acetate copolymer blended resin, internal structure is not tight, etc., to achieve the effect of shortening the plasticizing time, fine particle size, and compact particles

Inactive Publication Date: 2012-11-14
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the preparation method of vinyl chloride-vinyl acetate copolymer blended resin provided by CN86103607 patent, the prepared vinyl chloride-vinyl acetate copolymer blended resin has the defects of relatively coarse resin particles, insufficient compact structure and poor viscosity-reducing effect; The preparation method disclosed in the CN85108354 patent cannot prepare vinyl chloride-vinyl acetate copolymer blended resin; the preparation method disclosed in CN129368C and CN1796424A, the surface of the prepared vinyl chloride-vinyl acetate copolymer blended resin particles has obvious collapse, and the internal structure is not Tight, poor viscosity reducing effect

Method used

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  • Closely spherical blending resin of vinyl chloride-vinyl acetate copolymer and preparation method thereof
  • Closely spherical blending resin of vinyl chloride-vinyl acetate copolymer and preparation method thereof
  • Closely spherical blending resin of vinyl chloride-vinyl acetate copolymer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] 93kg vinyl chloride monomer, 7kg vinyl acetate, 0.3kg initiator (tert-butyl peroxyneodecanoate), 0.2kg sizing agent (sodium sulfide), 0.012kg pH regulator (sodium bicarbonate), 0.15kg dispersant (hydroxypropyl methylcellulose and gelatin), 0.026kg dispersing aid (sodium lauryl sulfate), 200kg desalted water, 0.012kg terminator (acetone thiosemicarbazone).

[0047] Add initiator, dispersant, dispersing aid, sizing agent, desalted water, and pH adjuster to the polymerization kettle, vacuumize after nitrogen pressure test, add 70kg of vinyl chloride monomer, stir, heat up, and carry out polymerization reaction at 62°C. After 2.0 hours of polymerization, when the polymerization conversion rate of vinyl chloride monomer is 30%, the temperature is lowered to 59°C to continue polymerization. After 4.0 hours of polymerization, the polymerization pressure drops, and 23kg of vinyl chloride monomer is added in two times to continue the reaction. The polymerization reaction When th...

Embodiment 2

[0050] 80kg vinyl chloride monomer, 20kg vinyl acetate, 0.35kg initiator (bis-(2-ethylhexyl peroxydicarbonate), tert-butyl peroxyneodecanoate or bis-(3,5,5 -trimethylhexanoyl)), 0.15kg granulator (sodium sulfide), 0.012kg pH regulator (ammonium bicarbonate), 0.17kg dispersant (gelatin), 0.026kg dispersant (cetyl alcohol), 200kg desalination Water, 0.012kg terminator (acetone thiosemicarbazone).

[0051] Add initiator, dispersant, dispersing aid, sizing agent, desalted water, and pH adjuster to the polymerization kettle, vacuumize after nitrogen pressure test, add 70kg of vinyl chloride monomer, stir, heat up, and carry out polymerization reaction at 61.5°C. After 2.0 hours of polymerization, when the polymerization conversion rate of vinyl chloride monomer is 50%, lower the temperature to 58°C and continue polymerization. After 3.5 hours of polymerization, the polymerization pressure drops. After falling (the drop value is about 0.15Mpa), add a terminator to stop the reaction...

Embodiment 3

[0054] 90kg vinyl chloride monomer, 10kg vinyl acetate, 0.3kg initiator (tert-butyl peroxyneodecanoate), 0.2kg sizing agent (sodium sulfide), 0.012kg pH regulator (sodium bicarbonate), 0.015kg dispersant (Hydroxypropylmethylcellulose and gelatin), 0.026kg dispersing aid (sodium lauryl sulfate), 200kg desalted water, 0.012kg terminator (bisphenol A).

[0055] Add initiator, dispersant, dispersing aid, sizing agent, desalted water, and pH adjuster to the polymerization kettle, vacuumize after nitrogen pressure test, add 70kg of vinyl chloride monomer, stir, heat up, and carry out polymerization reaction at 61.5°C. After 2.0 hours of polymerization, when the polymerization conversion rate of vinyl chloride monomer is 40%, the temperature is lowered to 59°C to continue polymerization. After 3.7 hours of polymerization, the polymerization pressure drops. Add 20kg of vinyl chloride monomer to continue the reaction, and the polymerization pressure drops again. (the drop value is abou...

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Abstract

The invention discloses a closely spherical blending resin of vinyl chloride-vinyl acetate copolymer and a preparation method of the closely spherical blending resin of vinyl chloride-vinyl acetate copolymer. The resin of vinyl chloride-vinyl acetate copolymer has a vinyl acetate content of 5-25%, a degree of polymerization of 800-900, an apparent density of 0.50-0.70g / ml, a plasticizer absorption rate of 7-12g / 100g PVC (polyvinyl chloride), an average particle size of 30-60 microns, a particle size distribution breadth index of below 1 and a particle morphology of closely sphere. According to the invention, when the copolymerization reaches to a certain polymerization conversion, the polymerization temperature is changed to improve tightness and tacticity of the blending resin particles of vinyl chloride-vinyl acetate copolymer. The closely spherical blending resin of vinyl chloride-vinyl acetate copolymer provided by the invention has the characteristics of close particle, spherical shape, fine particle size and concentrated distribution and low plasticizer absorption rate. The closely spherical blending resin of vinyl chloride-vinyl acetate copolymer is blended into PVC paste resin to reduce paste viscosity significantly, increase flow performance, reduce plasticizing temperature of plastisol, shorten the plasticizing time, and increase adhesion and abrasion resistance of the plasticized plastisol product.

Description

technical field [0001] The invention relates to a method for preparing compact spherical vinyl chloride-vinyl acetate copolymer blended resin by suspension method. Background technique [0002] Vinyl chloride-vinyl acetate copolymer blending resin refers to a special PVC resin mixed with polyvinyl chloride (PVC) resin to reduce paste viscosity during processing. It can replace part of PVC paste resin for paste processing, which can significantly reduce Increase the viscosity of the plastic paste, improve the fluidity of the paste, and greatly reduce the cost of the paste. It is used and developed along with the development and application requirements of PVC paste resin. Its production method can adopt suspension method, emulsion method and bulk method, and the suspension method is the main technology. [0003] Vinyl chloride-vinyl acetate copolymerized blended resin is a copolymerized blended resin. Because of its excellent plasticizing performance, impact resistance and s...

Claims

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Application Information

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IPC IPC(8): C08F214/06C08F218/08C08F2/38C08F2/20C08L27/06
Inventor 刘松涛袁茂全胡妹华沈青黄业勤张龙弟张月芳
Owner SHANGHAI CHLOR ALKALI CHEM
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