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Environment-friendly powdery urea-formaldehyde resin adhesive

A urea-formaldehyde resin glue, an environmentally friendly technology, applied in the direction of adhesives, adhesive additives, starch-derived adhesives, etc., can solve the problems of short storage period, low solid content, high free formaldehyde, etc., and achieve easy addition and long storage period Effect

Inactive Publication Date: 2018-03-30
李琛璞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing urea-formaldehyde modified starch adhesives are generally liquid, but liquid urea-formaldehyde adhesives have disadvantages such as short storage period, high free formaldehyde, low solid content, and inconvenient transportation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An environmentally friendly powdery urea-formaldehyde resin adhesive, comprising the following components in parts by weight: 120 parts of cornstarch, 23 parts of formaldehyde, 20 parts of urea, 3 parts of hydrogen peroxide, 3 parts of sodium hydroxide, 0.8 parts of formic acid, 0.6 parts of ammonia water, 30 parts of UF resin, 18 parts of nano-copper oxide, and 5 parts of methanol.

[0025] The preparation method of described a kind of environment-friendly powdery urea-formaldehyde resin adhesive, concrete steps are as follows:

[0026] Step 1. Add cornstarch to sodium hydroxide solution and stir evenly to activate it. The activation time is 15 minutes, then add hydrogen peroxide solution and stir evenly again, and place it at 60°C for 3 hours. After the reaction stops, put it in a drying oven. Dried inside, ground after cooling to obtain oxidized cornstarch, set aside;

[0027] Step 2: Add nano-copper oxide to the nano-copper oxide dispersion liquid to disperse evenl...

Embodiment 2

[0032] An environment-friendly powdery urea-formaldehyde resin adhesive, comprising the following components in parts by weight: 13 parts of tapioca starch, 28 parts of formaldehyde, 22 parts of urea, 4 parts of hydrogen peroxide, 4 parts of sodium hydroxide, 0.9 parts of formic acid, 0.8 parts of ammonia water, 35 parts of UF resin, 22 parts of nano-copper oxide, and 7 parts of methanol.

[0033] The preparation method of described a kind of environment-friendly powdery urea-formaldehyde resin adhesive, concrete steps are as follows:

[0034] Step 1. Add starch to sodium hydroxide solution and stir evenly for activation. The activation time is 20 minutes. Then add hydrogen peroxide solution and stir evenly again. Place it at 65°C for 3.5 hours. After the reaction stops, put it in a drying oven. Dried inside, ground after cooling to obtain oxidized starch, set aside;

[0035] Step 2: Add nano-copper oxide to the nano-copper oxide dispersion liquid to disperse evenly, then sti...

Embodiment 3

[0040] An environmentally friendly powdery urea-formaldehyde resin adhesive, comprising the following components in parts by weight: 140 parts of potato starch, 33 parts of formaldehyde, 24 parts of urea, 5 parts of hydrogen peroxide, 5 parts of sodium hydroxide, 1 part of formic acid, 1 part of ammonia water, 40 parts of UF resin, 24 parts of nano-copper oxide, and 10 parts of methanol.

[0041] The preparation method of described a kind of environment-friendly powdery urea-formaldehyde resin adhesive, concrete steps are as follows:

[0042] Step 1. Add starch to sodium hydroxide solution and stir evenly to activate it. The activation time is 25 minutes. Then add hydrogen peroxide solution and stir evenly again. Place it at a temperature of 70°C for 4 hours. After the reaction stops, put it in a drying box. Dried, ground after cooling to obtain oxidized starch, set aside;

[0043] Step 2. Add nano-copper oxide to the nano-copper oxide dispersion liquid to disperse evenly, th...

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PUM

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Abstract

An environmentally friendly powdery urea-formaldehyde resin adhesive, comprising the following components in parts by weight: 120-140 parts of starch, 23-33 parts of formaldehyde, 20-24 parts of urea, 3-5 parts of hydrogen peroxide, and sodium hydroxide 3-5 parts, 0.8-1 part of formic acid, 0.6-1 part of ammonia water, 30-40 parts of UF resin, 18-24 parts of nano-copper oxide, 5-10 parts of dispersion liquid; also discloses an environmentally friendly powdery urea-formaldehyde resin The preparation method of the adhesive: adding nano-copper oxide into the nano-copper oxide dispersion liquid to uniformly disperse it, mixing it with oxidized starch and UF resin glue, putting it into the reaction kettle for heating and reacting to obtain a colloidal mixture A, and finally Put it in for spray drying and centrifugation to obtain powdery urea-formaldehyde resin adhesive. To sum up, the present invention has the characteristics of high bonding strength, water resistance, and long storage period. Starch is used as the main raw material, which effectively reduces environmental hazards, reduces production costs, and improves the production benefits of enterprises.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to an environment-friendly powdery urea-formaldehyde resin adhesive. Background technique [0002] Adhesives are the blood of my country's wood-based panel industry. As the largest country in the world's wood-based panel production, consumption, and import and export trade, China uses more than 6.5 million tons of adhesives for wood-based panel production in terms of solid content. Traditional glue The three main types are urea-formaldehyde resin adhesives, melamine-modified urea-formaldehyde resins and phenolic resins, which are three "aldehyde-based" synthetic resin adhesives. These adhesives generally have a certain amount of apron release, which endangers the health of consumers. . In order to reduce the defects of formaldehyde release from the above-mentioned adhesives, starch was used as the main raw material to prepare adhesives. Starch is a polysaccharide polym...

Claims

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Application Information

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IPC IPC(8): C09J103/10C09J161/24C09J11/04C08G12/12C08B31/18C08J3/12
CPCC09J103/10C08B31/18C08G12/12C08J3/122C08J2303/10C08J2461/24C08K2003/2248C08K2201/011C09J11/04C09J161/24C08L61/24C08K3/22
Inventor 李琛璞
Owner 李琛璞
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