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Modified water resistant low temperature white emulsoid

A technology of low temperature resistance and white latex, which is applied in the direction of adhesive type, monocarboxylate copolymer adhesive, etc., can solve the problems that the comprehensive performance cannot be improved, the concept of environmental protection is not allowed, and the application limitations are large. Achieve good social benefits, low cost and good economic benefits

Inactive Publication Date: 2002-11-06
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, some modifications have improved a single performance of polyvinyl acetate emulsion, but the overall performance has not been improved; the application of some modified polyvinyl acetate emulsion is very limited; some are too expensive; more When some polyvinyl acetate emulsions are acetalized and modified, they use the condensation reaction of polyvinyl alcohol in polyvinyl acetate emulsions and formaldehyde under acidic conditions, so the products inevitably contain harmful substance formaldehyde. And this is not allowed by the current environmental protection concept

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: 1). The weight of each component of modified water-resistant and low-temperature resistant white latex is as follows:

[0022] A polyvinyl acetate emulsion (PVAc) with a solid content of 37%: 300 grams;

[0023] Ethylene-vinyl acetate emulsion (EVA) with a solid content of 60%: 60 grams;

[0024] Concentration by weight is 12% polyvinyl alcohol aqueous solution (PVA): 100 grams;

[0025] Calcium Carbonate: 60g: Kaolin: 60g. 2). The preparation steps of modified water-resistant and low-temperature resistant white latex are as follows:

[0026] ①. Add water to the existing reaction kettle to heat, slowly add polyvinyl alcohol, stir, and raise the temperature to 90°C. After the polyvinyl alcohol is completely dissolved, cool to room temperature to make a polyvinyl alcohol aqueous solution.

[0027] ②. Add polyvinyl acetate emulsion and ethylene-vinyl acetate emulsion respectively under stirring at room temperature, and stir evenly.

[0028] ③. Then slowly...

Embodiment 2

[0031] Embodiment 2: 1). The weight of each component of modified water-resistant and low-temperature resistant white latex is as follows:

[0032] A polyvinyl acetate emulsion (PVAc) with a solid content of 45%: 500 grams;

[0033] Ethylene-vinyl acetate emulsion (EVA) with a solid content of 40%: 200 grams;

[0034] Weight concentration is 10% polyvinyl alcohol aqueous solution (PVA): 160 grams;

[0035] Calcium Carbonate: 160g; Kaolin: 100g. 2). The preparation steps of the modified water-resistant and low-temperature-resistant white latex are the same as in Example 1. The difference between the process and Example 1 is that the melting temperature of polyvinyl alcohol rises to 95 ° C, and the polymer blending and stirring time is 30 minutes. Thereby the modified water-resistant and low-temperature resistant white latex is prepared. The present invention and existing product test result are shown in Table 2:

[0036] Inspection item (unit)

[0037] As can be s...

Embodiment 3

[0038] A polyvinyl acetate emulsion (PVAc) with a solid content of 30%: 400 grams;

[0039] 50% solid content of ethylene-vinyl acetate emulsion (EVA): 100 grams;

[0040] Weight concentration is 8% polyvinyl alcohol aqueous solution (PVA): 200 grams;

[0041] Calcium Carbonate: 100g; Kaolin: 160g. 2). The preparation steps of the modified water-resistant and low-temperature resistant white latex are the same as in Example 1. The difference between the process and Example 1 is that the melting temperature of polyvinyl alcohol rises to 93 ° C, and the polymer blending and stirring time is 25 minutes. Thus the modified water-resistant and low-temperature resistant white latex is obtained. The present invention and existing product test result are shown in Table 3:

[0042] Inspection item (unit)

[0043] As can be seen from Table 3, the compressive shear strength (wet strength) of the present invention is 4.3MPa, which is 2.3MPa higher than the 2MPa of the existing ...

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Abstract

The present invention relates to adhesive and discloses a kind of modified waterproof low temperature white emulsoid and its preparation. The modified waterproof low temperature white emulsoid is prepared by using polyvinyl acetate emulsion as base material, water solution of polyvinyl alcohol as emulsoid protector, ethylene-vinyl acetate emulsion as waterproof and low temperature modified and calcium carbonate as kaolin as adhesion intensifier. It has various specifications exceeding the chemical industry standard, excellent waterproof performance, good low temperature performance, simple production process, relatively lower cost and no toxicity and harm.

Description

Technical field: [0001] The invention belongs to the field of adhesives, and in particular relates to a modified water-resistant and low-temperature resistant white latex and a preparation method thereof. Background technique: [0002] Polyvinyl acetate emulsion, also known as white latex. It came out in 1929 and started industrial production in 1937. Now the output of polyvinyl acetate emulsion in my country is second only to urea-formaldehyde resin, ranking second in the production and use of adhesives. The material has a series of advantages such as convenient use, wide application, and easy production, and can be widely used in the bonding of materials in many fields such as wood processing, fabric bonding, furniture assembly, packaging materials, and architectural decoration. The market is very broad. [0003] However, due to its molecular structure and manufacturing characteristics, polyvinyl acetate emulsion and its film have disadvantages such as poor water resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J131/04
Inventor 陈月辉
Owner SHANGHAI UNIV OF ENG SCI
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