Polymerization method used for reducing vinyl chloride/vinyl acetate copolymer blending resin glass transition temperature

A technology of glass transition temperature and resin blending, which is applied in the polymerization field of reducing the glass transition temperature of vinyl acetate copolymer blending resin, can solve the problems of low plasticity, difficult to meet the industrial sector, poor processing rheology, etc., and achieves high plasticity and easy processing. Adhesion to metal surface, low molding temperature effect

Inactive Publication Date: 2016-01-27
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the existing processing methods, such as the method disclosed in the 02136103.7 patent, the glass transition temperature of the obtained vinyl chloride copolymer blended resin is generally 78 ~ 85 ℃, the processing rheology is poor, the plasticity is low, and it is difficult to meet the requirements of the industrial sector

Method used

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  • Polymerization method used for reducing vinyl chloride/vinyl acetate copolymer blending resin glass transition temperature
  • Polymerization method used for reducing vinyl chloride/vinyl acetate copolymer blending resin glass transition temperature
  • Polymerization method used for reducing vinyl chloride/vinyl acetate copolymer blending resin glass transition temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Put 10.2kg vinyl chloride, 1.08kg vinyl acetate, 0.008kg initiator azobisisobutyronitrile, 0.006kg sodium bicarbonate, 0.0005kg sodium carbonate, 0.03kg hydroxypropyl methylcellulose and 16kg water into the polymerization kettle , the temperature was raised to 52°C and maintained for 1 hour, and then the temperature was naturally raised to 60°C. When the reaction pressure dropped by 300KPa, 0.04kg of terminator acetone thiosemicarbazone and 0.001kg of defoamer organosiloxane were added to terminate the reaction to obtain vinyl chloride- The slurry emulsion of vinyl acetate copolymer blended resin is discharged into the discharge tank, and 0.15 kg of lye with a weight concentration of 32.5% is added for treatment, and then stripped, centrifugally dehydrated, and air-dried to obtain a finished product. The obtained finished product was tested according to the GB5761-93 standard, and the results are shown in Table 1.

[0025] The glass transition temperature (Tg) is 70-75°...

Embodiment 2

[0027] Put 11.5kg of vinyl chloride, 0.9kg of vinyl acetate, 0.009kg of azobisisobutyronitrile, 0.006kg of ammonium bicarbonate, 0.0005kg of sodium carbonate, 0.03kg of dispersant polyvinyl alcohol and 16kg of water in a polymerization kettle and heat up to 48°C Maintain for 1 hour, then naturally raise the temperature to 65°C, and when the reaction pressure drops by 200KPa, add 0.04kg of terminator acetone thiosemicarbazone and 0.001kg of defoamer silicone ether copolymer to end the reaction to obtain vinyl chloride-vinyl acetate copolymer blend The slurry emulsion of the resin is discharged into the discharge tank, treated by adding 0.15kg of 32.5% lye, and then subjected to steam stripping, centrifugal dehydration and air drying 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. The glass transition temperature (Tg) is 70-75°C;

Embodiment 3

[0029] Put 9.1kg of vinyl chloride, 2.2kg of vinyl acetate, 0.008kg of azobisisobutyronitrile, 0.006kg of sodium bicarbonate, 0.0005kg of sodium carbonate, 0.03kg of dispersant gelatin and 16kg of water in a polymerization kettle, and raise the temperature to 51°C to maintain After 1.5 hours, the temperature was naturally raised to 64°C. When the reaction pressure dropped by 250KPa, the reaction was completed, and 0.04kg of terminator acetone thiosemicarbazone and 0.001kg of defoamer polyether were added to complete the reaction, and a vinyl chloride-vinyl acetate copolymer blend was obtained. The slurry emulsion of the resin is discharged into the discharge tank, treated by adding 0.15kg of 32.5% lye, and then subjected to steam stripping, centrifugal dehydration and air drying to obtain the finished product. The glass transition temperature (Tg) is 70-75°C; the obtained finished product is tested according to the GB5761-93 standard, and the results are shown in Table 1.

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Abstract

The invention discloses a polymerization method used for reducing vinyl chloride/vinyl acetate copolymer blending resin glass transition temperature. The polymerization method comprises following steps: vinyl chloride monomer, vinyl acetate monomer, a dispersing agent, a size stabilization agent, an initiating agent, and desalted water are delivered into a polymerization kettle for reaction; temperature is increased to 48 to 52, and is maintained for 1 to 2h, and then is increased naturally to 60 to 65 DEG C; when reaction pressure is reduced to 200 to 300KPa, a terminating agent and an antifoaming agent are added to end the reaction so as to obtain a vinyl chloride/vinyl acetate copolymer blending resin slurry emulsion; an alkaline liquor is added, and the vinyl chloride/vinyl acetate copolymer blending resin is collected from a reaction product. According to the polymerization method, the vinyl chloride/vinyl acetate copolymer blending resin is relatively low in glass transition temperature Tg, excellent in fluidity, flexibility, toughness, and thermoplasticity, is convenient to process, can be adhered with metal surfaces easily, and can be widely used for preparing plastic floor, transparent packaging sheets, artificial leather, protective paint, magnetic binders, and printing plates.

Description

technical field [0001] The invention provides a polymerization method for lowering the glass transition temperature of vinyl acetate copolymer blended resin. Background technique [0002] In the polyvinyl chloride polymerization process, vinyl acetate monomer is added for copolymerization reaction to form vinyl chloride-vinyl acetate copolymer blended resin, which can reduce the glass transition temperature of polyvinyl chloride (T g ), making the molding processing temperature low, good fluidity and easy processing, good flexibility, toughness, thermoplasticity, easy to bond to the metal surface, etc., good chemical stability at room temperature, acid and alkali resistance, and water vapor The transmittance and absorption rate are low, and it can be widely used in the manufacture of plastic floors, transparent sheets for packaging, artificial leather, protective coatings, tape adhesives, printing plates, and many other aspects. [0003] Compared with ordinary polyvinyl chl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/06C08F218/08
Inventor 耿震张彧平俞昉范宜军
Owner SHANGHAI CHLOR ALKALI CHEM
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