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Preparing method of nanometer bentonite modified urea resin adhesive

A technology of urea-formaldehyde resin and bentonite, which is applied in aldehyde/ketone condensation polymer adhesives, adhesive types, starch adhesives, etc., can solve the problems of low formaldehyde release content, good adhesive quality and water resistance, etc. Achieve the effect of low formaldehyde release content, good initial viscosity and good water resistance

Inactive Publication Date: 2015-11-11
JIANGSU ZHENYU ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the invention: aiming at the disadvantages of long curing time, poor initial adhesive quality, large shrinkage, high brittleness, water resistance, easy aging, release of formaldehyde and pollution of the environment and damage to health in the current urea-formaldehyde resin, it provides A preparation method of nano-bentonite modified urea-formaldehyde resin adhesive, the urea-formaldehyde resin adhesive prepared by the method has low formaldehyde release content, less environmental pollution, short curing time and good adhesive quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Firstly, the bentonite is subjected to high-pressure grinding at a pressure of 10 MPa and sieved, and the bentonite particles are screened with a particle size of 200 meshes. Thermal activation is carried out at a temperature of 30°C for 20 minutes, and then the program is heated, and the temperature rises every 30 minutes. 5 degrees, stop heating after the temperature rises to 90 ° C, and activate it for 1 hour, then stop heating it, put it in a desiccator and let it cool down to 20 ° C for standby; then select 60 parts by weight 40 parts of flour and 40 parts of amylase solution with a mass fraction of 50%, at a temperature of 25°C, shake and stir in a shaker for 20 minutes, then place the mixed turbid solution in a centrifuge for centrifugation for 20 minutes at a centrifugation speed of 400r / min, after the centrifugation is completed, take out the upper starch semi-hydrolyzed solution and place it in the air to cool down to 20°C for later use; then weigh the activate...

example 2

[0019] Firstly, the bentonite is subjected to high-pressure grinding at a pressure of 13MPa and sieved to screen the bentonite particles with a particle size of 250 mesh, and heat activation is performed at a temperature of 30°C for 25 minutes, and then the program is heated, and the temperature rises every 30 minutes 5 degrees, stop the temperature rise after the temperature rises to 90 ° C, and activate it for 1.5 hours, then stop heating it, put it in a desiccator and let it cool down to 25 ° C for use; then by weight parts, select 70 parts of flour and 30 parts of amylase solution with a mass fraction of 50%, at a temperature of 25°C, shake and stir in a shaker for 25 minutes, then place the mixed turbid solution in a centrifuge for centrifugation for 20 minutes, the centrifugation speed 450r / min. After the centrifugation is completed, take out the starch semi-hydrolyzate in the upper layer and place it in the air to cool down to 25°C for later use; then weigh the activated...

example 3

[0022] Firstly, the bentonite is subjected to high-pressure grinding at a pressure of 15MPa and sieved to screen the bentonite particles with a particle size of 300 meshes, and heat-activated at a temperature of 30°C for 30 minutes, followed by programmed heating, and the temperature rises every 30 minutes 5 degrees, stop heating after the temperature rises to 90°C, and activate it for 2 hours, then stop heating it, put it in a desiccator and let it cool down to 30°C for later use; then select 80% by weight. 1 part of flour and 20 parts of amylase solution with a mass fraction of 50%, at a temperature of 25°C, shake and stir in a shaker for 25 minutes, then place the mixed turbid solution in a centrifuge for centrifugation for 20 minutes at a centrifugation speed of 500r / min, after the centrifugation is completed, take out the upper starch semi-hydrolyzed solution and place it in the air to cool down to 30°C for later use; then weigh the activated bentonite particles and starch...

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Abstract

The invention discloses a preparing method of a nanometer bentonite modified urea resin adhesive and belongs to the technical field of urea resin adhesive preparation. The urea resin adhesive is prepared through the steps that bentonite is ground into particles at the high pressure, subjected to thermal activation and procedure warming and then placed in a dryer for standing, temperature reducing and later using; a flour and amylase solution is selected and subjected to oscillating, stirring and centrifugal separating through a table, and hydrolysate on the upper layer is taken for standby application; standby bentonite particles and the hydrolysate are mixed and then are mixed with an NH4Cl curing agent and urea resin for ageing, and after a curing reaction is conducted, the mixture is placed in the dryer, and absorption liquid is added or replaced for standing. The preparing method has the advantages that the urea resin adhesive prepared through the method is low in formaldehyde releasing content, it is detected that the content of the released formaldehyde is 0.06-0.1 mg / m<3>, and the pollution to the environment is small; the curing time is short, the primary adhering quality is good, shrinkage and brittleness are small, the water resistance is good, and the urea resin adhesive is not prone to ageing.

Description

technical field [0001] The invention relates to a preparation method of nano-bentonite modified urea-formaldehyde resin adhesive, and belongs to the technical field of urea-formaldehyde resin adhesive preparation. Background technique [0002] Urea-formaldehyde resin, also known as urea-formaldehyde resin, is the polycondensation of urea and formaldehyde under the action of a catalyst (alkaline or acidic catalyst) to form an initial urea-formaldehyde resin, and then under the action of a curing agent or an auxiliary agent, it forms an insoluble and infusible late-stage thermosetting resin. . The color of cured urea-formaldehyde resin is lighter than that of phenolic resin, and it is translucent. It is resistant to weak acids and alkalis, has good insulation performance, excellent wear resistance, and is cheap. It is the most widely used variety in adhesives, especially in the wood processing industry. In the manufacture of various wood-based panels, urea-formaldehyde resin ...

Claims

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Application Information

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IPC IPC(8): C09J161/24C09J103/02C09J11/04
Inventor 郭迎庆盛艳花高力群
Owner JIANGSU ZHENYU ENVIRONMENTAL PROTECTION TECH
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