Preparation method of and product of modified polyvinyl acetate emulsion adhesive

A technology of polyvinyl acetate and latex adhesive, which is applied in the direction of monocarboxylate copolymer adhesives, adhesive additives, adhesive types, etc., and can solve the problems of decreased bonding strength, easy delamination, and film-forming creep resistance Poor denaturation and other problems, to achieve the effect of improving water resistance and cold resistance, high safety factor in use, and good adhesive performance

Inactive Publication Date: 2015-12-02
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this one-component polyvinyl acetate emulsion has some inherent disadvantages: when the solid content is high, the viscosity is high, and it is difficult to apply; when the solid content is low, the emulsion is unstable and easy to separate; The water resistance and cold resistance of vinyl acetate emulsion are poor, and the stability performance is not good; and its bonding strength is greatly reduced under hot and humid conditions, and the creep res

Method used

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  • Preparation method of and product of modified polyvinyl acetate emulsion adhesive
  • Preparation method of and product of modified polyvinyl acetate emulsion adhesive
  • Preparation method of and product of modified polyvinyl acetate emulsion adhesive

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preparation example Construction

[0050] The preparation of the modified polyvinyl acetate emulsion adhesive should pay attention to the following matters in the reaction:

[0051] 1. The agitation in the reaction vessel cannot be stopped all the time. When it is cooled to room temperature, the white latex product is obtained. Stop agitation, discharge and pack.

[0052] 2. When the viscosity of the adhesive is too high and the water resistance is poor, the amount of polyvinyl alcohol in the formula can be appropriately reduced.

[0053] 3. If the stability of the adhesive is poor, the amount of some initiators in the formula can be appropriately reduced. If it is too small, it will not initiate, making it difficult to polymerize the monomer.

[0054] 4. If the white latex product has a lot of foam, an appropriate amount of defoamer can be added.

[0055] 5. Pay attention to the dosage and adding time of the initiator. When the reflux starts to appear, if the reflux flow is large, it indicates that the initia...

Embodiment 1

[0059] Dosing reaction reagents according to the following mass percentages for preparation:

[0060]

[0061] Wherein deionized water: the mass percent of vinyl acetate is 2:1.

Embodiment 2

[0063] Dosing reaction reagents according to the following mass percentages for preparation:

[0064]

[0065] Wherein the mass percent of deionized water: vinyl acetate is 3:1.

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Abstract

The invention discloses a preparation method of a modified polyvinyl acetate emulsion adhesive. The preparation method includes: adding reaction agents including, by mass, 56.5-70% of vinyl acetate, 4-10% of plasticizer, 20-30% of modifier, 2-4% of dispersant, 0.9-2% of initiator, 2-4% of emulsifier and 0.3-1.0% of PH adjuster for emulsion polymerization. The invention further provides the adhesive prepared by the method. The adhesive is nontoxic and harmless, can realize adhesive effect and meets standards of chemical industry, waterproofness and cold resistance of polyvinyl acetate are improved, and using range of the emulsion adhesive of polyvinyl acetate is widened.

Description

technical field [0001] The invention relates to a preparation method of an emulsion adhesive, in particular to a preparation method of a modified polyvinyl acetate emulsion adhesive, and a product prepared according to the method. Background technique [0002] Polyvinyl acetate white latex is currently one of the most widely used and most used adhesive varieties. It is a polymer compound produced by free radical polymerization of vinyl acetate. It is widely used in wood, furniture, decoration, printing, textiles, etc. , leather, paper and other industries, has become a familiar adhesive. However, this one-component polyvinyl acetate emulsion has some inherent disadvantages: when the solid content is high, the viscosity is high, and it is difficult to apply; when the solid content is low, the emulsion is unstable and easy to separate; The water resistance and cold resistance of vinyl acetate emulsion are poor, and the stability is not good; and its bonding strength is grea...

Claims

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Application Information

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IPC IPC(8): C09J131/04C09J11/06C08F218/08C08F220/18C08F220/28C08F2/26C08F2/30
Inventor 施晓旦杨欢邵威金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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