Environment-friendly formaldehyde-free urea resin and preparation method thereof
A technology of urea-formaldehyde resin and formaldehyde, which is applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., can solve problems such as impossible eradication, adverse effects on human health and environmental protection, and achieve bonding The effect of high strength, moderate pH and high solid content
Inactive Publication Date: 2014-08-13
HUBEI YULI ABRASIVE BELTS GRP
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Problems solved by technology
However, urea-formaldehyde resin will release formaldehyde during production and use, which will have very adverse effects on human health and environmental protection.
The addition reaction to prepare urea-formaldehyde resin is a reversible reaction, so the free formaldehyde in the glue can only be reduced to a certain limit, and it is impossible to eradicate it.
Method used
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Embodiment 1
[0012] Environmentally friendly formaldehyde-free urea-formaldehyde resin, which is prepared from urea, dialdehyde starch, formic acid, sodium hydroxide solution, water, borax and tributyl phosphate. The ratio of each raw material is: urea 300kg, dialdehyde starch 135kg, formic acid 0.5 -1kg, sodium hydroxide solution 25-30kg, water 405kg, borax 1.2kg, tributyl phosphate 0.5-1kg.
[0013] The nitrogen content in the urea is greater than 46.4% (mass).
[0014] The mass concentration of described sodium hydroxide solution is 30% (mass).
[0015] The preparation method of above-mentioned environmental protection formaldehyde-free urea-formaldehyde resin, it comprises the steps:
[0016] 1) Selection of raw materials: According to the ratio of each raw material: urea 300kg, dialdehyde starch 135kg, formic acid 0.5-1kg, sodium hydroxide solution 25-30kg, water 405kg, borax 1.2kg, tributyl phosphate 0.5-1kg, select Urea, dialdehyde starch, formic acid, sodium hydroxide solution, w...
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The invention relates to an environment-friendly formaldehyde-free urea resin and a preparation method thereof. The environment-friendly formaldehyde-free urea resin is characterized by being prepared from the following components in parts by weight: 300 parts of urea, 135 parts of dialdehyde starch, 0.5-1 part of formic acid, 25-30 parts of sodium hydroxide liquid, 405 parts of water, 1.2 parts of borax and 0.5-1 part of tributyl phosphate. The prepared environment-friendly formaldehyde-free urea resin (or called as a urea-dialdehyde starch glue) contains functional groups such as an aldehyde group, an acylamino group and a hydroxymethyl group, and is high in bonding strength and appropriate in pH value; the environment-friendly formaldehyde-free urea resin is an impurity-free yellowish uniform liquid, and is high in solid content, zero in free formaldehyde (environment-friendly), and capable of meeting the requirements on a glue for treating waterproof abrasive paper, an abrasive cloth, abrasive paper for wood and an abrasive belt.
Description
Technical field [0001] The invention relates to a formaldehyde-free urea-formaldehyde resin for coating abrasive tools and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin is cheap, simple to manufacture and has excellent performance. It is widely used in the cloth-based treatment of water-resistant sandpaper, wood sand, emery cloth and abrasive belts in coated abrasive tools. However, urea-formaldehyde resin releases formaldehyde during its production and use, which has a very negative impact on human health and environmental protection. The addition reaction for preparing urea-formaldehyde resin is a reversible reaction, so the free formaldehyde in the glue can only be reduced to a certain limit and cannot be eradicated. Therefore, the present invention uses dialdehyde starch instead of formaldehyde as the aldehyde-containing material to react with urea to develop a urea dialdehyde starch adhesive (environmentally friendly formaldehyde-f...
Claims
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Login to View More IPC IPC(8): C08G12/12C08B31/00C09J161/24C09J103/04
Inventor 张洪涛罗超洪段忠烽易敏张震卢中圣
Owner HUBEI YULI ABRASIVE BELTS GRP