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Preparation method of polyvinyl acetate emulsion

A technology of polyvinyl acetate and polyvinyl alcohol, which is applied in the field of preparation of polyvinyl acetate emulsion, can solve the problems of emulsion adhesive performance decline, influence on use performance, poor dilution stability, etc., and achieve good adhesive performance, The effect of easy implementation and increased stability

Inactive Publication Date: 2018-06-29
SINOPEC SICHUAN VINYLON FACTORY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that the dilution stability of the currently produced polyvinyl acetate emulsion is not good, and the sediment of the diluted polyvinyl acetate emulsion gradually increases with the prolongation of storage time, resulting in a decrease in the adhesive performance of the emulsion, thereby affecting its performance.

Method used

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  • Preparation method of polyvinyl acetate emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 40 parts of water into the reactor, then add 3 parts of 1788, 13 parts of 0588, and 6 parts of 1797 to dissolve, then add 50 parts of vinyl acetate and stir evenly. The temperature of the reaction system was controlled at 68° C., and 0.2 parts of reducing agent (zinc formaldehyde sulfoxylate) and 0.2 parts of oxidizing agent (hydrogen peroxide) were added. After 30 minutes, the temperature of the reaction system was controlled to 80°C, and 10 parts of vinyl acetate, 0.1 part of sodium bicarbonate, 0.2 parts of oxidant (hydrogen peroxide) and 10 parts of water were added dropwise, and the addition was completed within 60 minutes. Cool down, filter, and discharge.

Embodiment 2

[0025] The polyvinyl acetate emulsion prepared in embodiment 1 is carried out dilution stability test experiment

[0026] Detection method

[0027] (1) In a 100mL beaker, weigh 15 grams of synthetic emulsion and 15 grams of distilled water, and stir well.

[0028] (2) Take a 10mL centrifuge tube, weigh its weight m1, and record the weight m2 (about 10 grams) of the diluted emulsion poured into the tube.

[0029] (3) Put the centrifuge tube into the centrifuge, centrifuge at a speed of 2600 rpm for 4 minutes, take it out and invert the centrifuge tube for 5 minutes, dry the mouth of the tube, and weigh the sediment weight m3 in the tube. The formula for calculating the dilution stability parameter is:

[0030]

[0031] The smaller the value of the dilution stability parameter, the better the dilution stability of the emulsion.

[0032] The dilution stability parameter of the obtained polyvinyl acetate copolymer emulsion was 0.94%.

Embodiment 3

[0035] Add 42 parts of water into the reactor, then add 5 parts of 1788, 10 parts of 0588, and 10 parts of 1797 to dissolve, then add 45 parts of vinyl acetate and stir evenly. The temperature of the reaction system was controlled at 68° C., and 0.2 parts of reducing agent (sodium formaldehyde sulfoxylate) and 0.2 parts of oxidizing agent (tert-butyl hydroperoxide) were added. After 30 minutes, the temperature of the reaction system was controlled to 80°C, and 15 parts of vinyl acetate, 0.12 parts of sodium bicarbonate, 0.2 parts of oxidant (tert-butyl hydroperoxide) and 10 parts of water were added dropwise, and the addition was completed within 60 minutes. Cool down, filter, and discharge. The dilution stability parameter of the obtained polyvinyl acetate copolymer emulsion was 0.85%.

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Abstract

The invention provides a preparation method of polyvinyl acetate emulsion. The method is characterized in that a semi-continuous polymerization technology is carried out to prepare the polyvinyl acetate emulsion; a stabilizing agent is added to the continuous polymerizing stage; the type, the dosage and the adding mode of the stabilizer are effectively combined with the semi-continuous technologyto realize that the diluting stability of the prepared polyvinyl acetate emulsion is less than 1.0%; the stability of the diluted polyvinyl acetate emulsion is improved, and the adhering performance is greatly improved. The method is wide in raw material source, and low in price; the added cost is ignored while the quality of an existing polyvinyl acetate product is improved; an existing production technology is not changed a lot; and moreover, the method is convenient to carry out and is conveniently applicable to the polyvinyl acetate products.

Description

technical field [0001] The invention relates to polyvinyl acetate, in particular to a preparation method of polyvinyl acetate emulsion. Background technique [0002] Polyvinyl acetate emulsion is a polymer emulsion with vinyl acetate as the main unit. The emulsion is non-toxic, tasteless, non-corrosive, non-environmental polluting, non-flammable and explosive, and is a good adhesive for porous materials such as wood, paper, and fiber. It is an ideal product for bonding, widely used in printing, wood bonding, construction, leather, cigarettes, paper processing, fiber processing, aluminum foil paper compounding, emery cloth, sandpaper bonding and other industries, and can also be used for interior wall coatings and insulating boards for cast steel processing etc. [0003] In industry, polyvinyl acetate emulsion is generally prepared by semi-continuous emulsion polymerization process, which includes two stages of initial polymerization and continuous polymerization: initial po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F118/08C08F2/44C09J131/04
CPCC08F2/44C08F118/08C09J131/04
Inventor 张波刘晶晶罗丽华
Owner SINOPEC SICHUAN VINYLON FACTORY
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