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Prepn. of vinyl chloride-vinyl acetate copolymer resin

A technology for vinyl acetate copolymerization and resin blending, which is applied in the field of preparing vinyl chloride-vinyl acetate resin by a suspension method, can solve the problems of insufficiently compact structure, easy precipitation, poor viscosity reduction effect, etc., and achieves easy operation and improved flow and thixotropy. , the effect of low oil absorption

Inactive Publication Date: 2006-06-14
上海天原集团天原化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a preparation method of vinyl chloride-vinyl acetate copolymer blended resin, to overcome the relatively coarse resin particles produced in the prior art, the structure is not compact enough and the viscosity reduction effect is poor after paste formation, which is easy to produce Precipitation and other defects to meet the needs of industrial sectors

Method used

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  • Prepn. of vinyl chloride-vinyl acetate copolymer resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 14.25 kg of vinyl chloride, 0.75 kg of vinyl acetate, 0.014 kg of dimyristyl peroxide, 0.016 kg of trisodium citrate, 0.012 kg of sodium bicarbonate, 0.015 kg of hydroxypropyl methylcellulose and polypeptide polymer, 0.026 kg Put chlorinated paraffin and 27 kg of water in a polymerization kettle, react at a temperature of 58 ° C for 7 to 8 hours, add 0.003 kg of acetone thiosemicarbazone, and obtain an aqueous suspension of vinyl chloride-vinyl acetate copolymer blended resin , stripped with steam to remove unreacted vinyl chloride and vinyl acetate monomers, and centrifugally dried to obtain the finished product. The obtained finished product was tested according to the GB5761-93 standard, and the results are shown in Table 1.

Embodiment 2

[0033] 13.8 kg of vinyl chloride, 1.2 kg of vinyl acetate, 0.014 kg of dimyristyl peroxide, 0.018 kg of trisodium citrate, 0.012 kg of sodium bicarbonate, 0.015 kg of hydroxypropyl methylcellulose and polypeptide polymer, 0.026 kg 16, 18 mixed acid and 27 kg of water are placed in a polymerization kettle, reacted at a temperature of 58 ° C for 7 to 8 hours, and 0.003 kg of acetone thiosemicarbazide is added to obtain a vinyl chloride-vinyl acetate copolymer blended resin The aqueous suspension is stripped with steam to remove unreacted vinyl chloride and vinyl acetate monomers, and dried by centrifugation to obtain the finished product. The obtained finished product was tested according to the GB5761-93 standard, and the results are shown in Table 1.

Embodiment 3

[0035] 12.75 kg of vinyl chloride, 2.25 kg of vinyl acetate monomer, 0.015 kg of dimyristyl peroxide, 0.02 kg of trisodium citrate, 0.012 kg of sodium bicarbonate, 0.018 kg of hydroxypropyl methylcellulose and polypeptide polymer, Put 0.026 kg of octadecyl alcohol and 27 kg of water in a polymerization kettle, react at a temperature of 58 ° C for 7 to 8 hours, add 0.003 kg of bisphenol A, and obtain an aqueous suspension of vinyl chloride-vinyl acetate copolymer blended resin, water Steam stripping to remove unreacted vinyl chloride and vinyl acetate monomers, and centrifugal drying to obtain the finished product. The obtained finished product was tested using the GB576l-93 standard, and the results are shown in Table 1.

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Abstract

A preparation method of vinyl chloride-vinyl acetate copolymer blended resin. Add vinyl chloride, vinyl acetate, initiator, sizing agent, pH stabilizer, dispersant, auxiliary dispersant and water into the polymerization kettle, react at a temperature of 40-70°C for 3-8 hours, and then add terminator , the aqueous suspension of vinyl chloride-vinyl acetate copolymer blended resin can be obtained, and then purified by conventional methods to remove unreacted vinyl chloride monomer and vinyl acetate monomer, centrifugal dehydration and drying to obtain the finished product . The invention is easy to operate and simple in equipment, and the prepared vinyl chloride-vinyl acetate resin has a compact particle structure, fine and uniform particles, concentrated distribution and low oil absorption rate, can greatly reduce the plasticizing temperature, and improve the storage stability of the plastisol, Improve the flow thixotropy of the paste. Can be widely used in artificial leather, floor leather, wallpaper and other adhesives, marine coatings, steel plate coatings, automotive sealants, anti-rust coatings, and anti-stone impact coatings for automotive chassis.

Description

technical field [0001] The invention relates to a method for preparing vinyl chloride-vinyl acetate resin by a suspension method. Background technique [0002] Adding vinyl chloride-vinyl acetate copolymer blending resin to polyvinyl chloride plastisol can greatly reduce the curing temperature of polyvinyl chloride, reduce the viscosity of the paste, improve the stability of the plastisol, improve the toughness and plasticity of the colloid, and enhance the impact resistance And shear resistance, while enhancing the adhesion to various substrates (such as metal, fiber). [0003] The vinyl chloride-vinyl acetate copolymer resin used for blending should have good physical and chemical properties, its viscosity number should be 80-100, the apparent density should be above 0.5mg / ml, and the oil absorption rate should be below 14%. . Therefore, a suitable preparation method has become a focus of attention of various manufacturers. Chinese patent 85108354 etc. discloses the pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/06C08L23/08
Inventor 陈肖勤李志云
Owner 上海天原集团天原化工有限公司
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