Super low poison lignum urea-formaldehyde resin adhesive and preparation method thereof

A urea-formaldehyde resin and wood technology, which is applied in the field of ultra-low-toxic wood urea-formaldehyde resin glue and its preparation, can solve the problems of endangering human health, environmental pollution, and high formaldehyde toxin, so as to avoid harming human health, promote economic development, Improve the effect of the environment

Inactive Publication Date: 2009-03-11
曾任河
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, urea-formaldehyde resin glue is widely used in the production of plywood, particleboard, artificial fiberboard and blockboard, etc. It has high cost and high formaldehyde toxin, which not only pollutes the environment, but also endangers human health after long-term use.

Method used

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Experimental program
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Embodiment

[0022] Take by weighing raw material (percentage by weight) by following proportioning:

[0023] Formaldehyde: 26%

[0024] Urea: 67%

[0025] Polyvinyl alcohol: 2.5%

[0026] Propylene sulfonate: 2%

[0027] Melamine: 2.5%

[0028] Alkali: 0.5%

[0029] Acid: 0.5%

[0030] The production method is as follows:

[0031] 1. Put the formaldehyde solution into the reaction kettle, stir, adjust the pH value to 7.8-8 with an alkaline solution such as sodium hydroxide solution, add polyvinyl alcohol, add 50% urea, heat up to 90°C, and keep warm for 60 minutes;

[0032] 2. Use an acid solution such as formic acid to adjust the pH value to 4-5.5, and a cloud point appears, add 20% urea, heat up to 90°C and react for 60 minutes, then cool down to 70°C, add melamine, and keep warm for 20 minutes minutes, add propylene sulfonate and cool down to 70°C;

[0033] 3. Add 30% urea, lower the temperature to 50°C, adjust the pH value to 7.8-8 with sodium hydroxide, and produce the finish...

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PUM

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Abstract

The invention discloses a method for preparing an ultra-low toxicity wooden urine-formaldehyde resin adhesive. The method comprises the following steps: formaldehyde, urea, alkali and acid are added with polyvinyl alcohol, propylene sulfonate and melamine and carry out fractionated reaction in a reaction kettle; the PH value of the mixture is between 7.8 and 8; the content of free formaldehyde is lower than 0.06 percent; and after the fractionated reaction, the mixture is of an glued shape and forms a finished product. The PH value of the adhesive is between 7.8 and 8; the content of the free formaldehyde is lower than 0.06 percent and is far lower than 0.3 percent prescribed by the national standard; and the ultra-low toxicity wooden urine-formaldehyde resin adhesive is superior to other resin adhesives in adhesive degree, strength and water resistance, is favorable for improving the environment, avoiding human health from harming, is also favorable for the export of furniture and plates of China and promotes the development of economy.

Description

Technical field [0001] The invention relates to an ultra-low toxicity wood urea-aldehyde resin glue and a preparation method thereof. Background technique [0002] At present, urea-formaldehyde resin glue is widely used in the production of plywood, particleboard, artificial fiberboard and blockboard, etc. It has high cost and high formaldehyde toxin, which not only pollutes the environment, but also endangers human health after long-term use. Contents of the invention [0003] The object of the present invention is to provide an ultra-low toxicity wood urea-aldehyde resin glue. [0004] Another object of the present invention is to provide a preparation method of ultra-low toxicity wood urea-aldehyde resin glue. [0005] In order to achieve the above object, the solution adopted in the present invention is: the present invention is by formaldehyde, urea, alkali, acid, adds polyvinyl alcohol, propylene sulfonate, melamine to carry out fractional reaction in reactor, and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/30
Inventor 曾任河
Owner 曾任河
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