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Green nontoxic adhesive and preparation method

A technology of adhesive and auxiliary agent, applied in the field of water-soluble non-toxic adhesive and preparation thereof, can solve the problems of affecting human health, high price, high toxicity of diisocyanate, etc., and achieves high viscosity, low cost, and no three wastes. The effect of emissions

Inactive Publication Date: 2005-11-30
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this adhesive contains a large amount of free formaldehyde, which is released into the environment during use and directly affects human health, one of the existing improvement methods is to add a formaldehyde scavenger, and it can be modified with diisocyanate in addition, but these two Neither of them can fundamentally solve the problem. During the use of the former, due to the action of light, oxygen, enzymes, and heat, the adhesive will also decompose and release formaldehyde. This effect is almost long-term.
Although the latter does not release formaldehyde, the diisocyanate itself is very toxic and expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 120mL of water into a 250mL three-necked bottle, heat it to 30°C, add 8.6 grams of polyvinyl alcohol of grade 1799 to the water, heat it to 90°C, keep stirring until the polyvinyl alcohol is completely dissolved, and when it cools down to about 80°C, add 12.6 grams of glucose, 1 gram of ammonium nitrate, 0.3 gram of copper sulfate, adjust the pH to 2.0 with 6M hydrochloric acid; react at 95°C for 3 hours, and adjust the pH to neutral with 6M sodium hydroxide to obtain the product.

[0028] Comparative Experiment:

[0029] Add 120mL of water into a 250mL three-necked bottle, heat it to 30°C, add 8.6 grams of polyvinyl alcohol with a grade of 1799 into the water, heat it to 90°C, keep stirring until the polyvinyl alcohol is completely dissolved; when the temperature drops to about 80°C, add 12.6 grams of glucose, adjust the pH to 2.0 with 6M hydrochloric acid, react at 95°C for 5 hours, and adjust the pH to neutral with 6M sodium hydroxide to obtain the product.

Embodiment 2

[0031] Add 120mL of water into a 250mL three-necked bottle, heat it to 50°C, add 8.6 grams of branded 1799 polyvinyl alcohol into the water, heat it to 90°C, keep stirring until the polyvinyl alcohol is completely dissolved, and when the temperature drops to about 80°C, add 10.8 gram of lactose, adjust the pH to 2.0 with 6M sulfuric acid, react at 95°C for 3 hours; finally adjust the pH to neutral with 3M potassium hydroxide to obtain the product.

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PUM

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Abstract

A non-toxic adhesive for building, paint, paper, artificial board, etc. is prepared from polyvinyl alcohol, sugar, acid and water through dissolving polyvinyl alcohol in water at 80-100 deg.C while stirring, adding sugar and acid, reaction at 80-100 deg.C for 2-8 hrs, regulating pH=6-8, and cooling. Its advantages are high adhesion and no environmental pollution.

Description

technical field [0001] The present invention relates to an adhesive and its preparation method, in particular to a water-soluble non-toxic adhesive and its preparation method. This adhesive can be used for laminated products, man-made boards, construction adhesives, and interior wall coatings , paper products and stationery glue, etc. Background technique [0002] At present, adhesives used in wood-based panels, construction glue, interior wall paint, stationery glue and shoemaking industries generally contain benzene, benzene homologues or formaldehyde. The existence of these harmful substances affects human health. In order to protect the environment and maintain people's health, research on non-toxic and environmentally friendly adhesives is a developing trend. Polyvinyl formal adhesive, commonly known as 107 glue, is a kind of adhesive widely used today, with low cost and good bonding effect. However, since this adhesive contains a large amount of free formaldehyde, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J129/04
Inventor 陈栓虎张蕾王玉麟
Owner NORTHWEST UNIV