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Preparation method of urea-melamine-formaldehyde resin glue for e0 floor

A technology of melamine and formaldehyde resin, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of complex operation and high cost, reduce formaldehyde release, prevent hydrolysis speed, reduce The effect of the content of ether linkages

Inactive Publication Date: 2012-02-01
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these are limited to the manufacture of plywood, and modifiers need to be added in the glue making. For multi-layer boards, post-treatment of aldehyde reduction is generally required, which is costly and complicated to operate.
At present, the E 0 level of craftsmanship, almost no

Method used

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  • Preparation method of urea-melamine-formaldehyde resin glue for e0 floor
  • Preparation method of urea-melamine-formaldehyde resin glue for e0 floor
  • Preparation method of urea-melamine-formaldehyde resin glue for e0 floor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Step 1: Add 250g of formaldehyde solution, 7.5g of the first batch of melamine, and 84g of the first batch of urea into a 500ml four-neck flask, add to the reactor, adjust the pH value to 7.5, raise the temperature to 80°C-90°C, and react for 40min.

[0029] The second step: adjust the pH value to 5.0, and react to the required viscosity at 90°C.

[0030] The third step: adjust the pH value to 6.5, add the second batch of melamine 7.5g and the second batch of urea 29g, react at 90°C for 50min.

[0031] Step 4: Adjust the pH value to 7.5, add the third batch of melamine 45g, and react at 80°C for 40min.

[0032]Step 5: Lower the temperature to 70°C, add the third batch of urea 29g, continue the reaction at 50°C for 30min, cool and discharge. Test their performance respectively, and the results are listed in attached table 1. and with 1% NH 4 Cl and 0.5% H 3 PO 4 The curing agent is used to press poplar plywood, and the test results are shown in attached table 2.

example 2

[0034] Step 1: Add 250g of formaldehyde solution, the first batch of 7.5g of melamine, and the first batch of 84g of urea into a 500ml four-necked flask into the reactor, adjust the pH value to 8.0, raise the temperature to 85°C, and react for 45min.

[0035] The second step: adjust the pH value to 5.5, and react to the required viscosity at 90°C.

[0036] The third step: adjust the pH value to 6.5, add the second batch of melamine 7.5g and the second batch of urea 24g, react at 90°C for 50min.

[0037] Step 4: Adjust the pH value to 8.0, add the third batch of melamine 45g, and react at 90°C for 40min.

[0038] Step 5: Lower the temperature to 70°C, add the third batch of urea 24g, continue the reaction at 60°C for 30min, cool and discharge. Test their performance respectively, and the results are listed in attached table 1. and with 1% NH 4 Cl and 0.5% H 3 PO 4 The curing agent is used to press poplar plywood, and the test results are shown in attached table 2.

example 3

[0040] Step 1: Add 250g of formaldehyde solution, 9g of the first batch of melamine, and 84g of the first batch of urea into a 500ml four-neck flask, add the reactor, adjust the pH value to 9.0, raise the temperature to 90°C, and react for 50min.

[0041] The second step: adjust the pH value to 5.8, and react to the required viscosity at 90°C.

[0042] The third step: adjust the pH value to 6.9, add the second batch of melamine 9g and the second batch of urea 29g, react at 90°C for 50min.

[0043] Step 4: Adjust the pH value to 9.0, add the third batch of melamine 52g, and react at 90°C for 40min.

[0044] Step 5: Lower the temperature to 70°C, add the third batch of urea 29g, continue the reaction at 60°C for 30min, then cool and discharge. Test their performance respectively, and the results are listed in attached table 1. and with 1% NH 4 Cl and 0.5% H 3 PO 4 The curing agent is used to press poplar plywood, and the test results are shown in attached table 2.

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Abstract

The invention discloses a preparation method of urea-melamine-formaldehyde resin glue for E0 grade flooring: the first step: mixing formaldehyde solution, melamine and urea, adjusting the pH value, raising the temperature to 80°C-95°C, and reacting for 40-60 minutes , wherein the molar ratio of formaldehyde / (urea+melamine) is 2.05-2.12:1; the second step: adjust the pH value to 5.0-6.0, and react to the cloud point; the third step: adjust the pH value to 6.0-6.9 , add urea and melamine, and the molar ratio of formaldehyde / (urea+melamine added cumulatively in the first and second steps) is 1.48~1.74:1, and react at 90°C for 30~70min; the fourth step: adjust the pH value to 7.5~9.0, add melamine, react at 80-90°C for 20~80min; step 5: add urea, and the molar ratio of formaldehyde to the total amount of urea and melamine added is 1.02~1.30:1, after the reaction is completed, cool and discharge . The plywood pressed with this glue has better boiling water resistance and lower formaldehyde emission, and the reaction is gentle and easy to control.

Description

technical field [0001] The present invention relates to a kind of preparation method of environment-friendly type floor urea-formaldehyde resin glue, relate in particular to a kind of E 0 A preparation method of low-cost melamine-modified urea-formaldehyde resin glue for grade flooring. Background technique [0002] my country has a large population and a shortage of forest resources. The per capita forest area is only 1 / 5 of the world's average level. 3 Reduced to 17.554 million m in 2000 3 , while relevant parties predict that the minimum demand for timber in my country from 2000 to 2010 will be 200 million m 3 , There is a big contradiction between the supply and demand of timber. The efficient utilization of wood has become the main development direction of my country's wood industry. It is estimated that 1m 3 Wood-based panels can replace 3.1m 3 The board made of logs, that is, the adhesive is of great significance to improve the utilization rate of wood. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/24C09J161/28
Inventor 储富祥王春鹏穆有炳赵临五金立维石建军
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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