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Preparation of urea-melamine-formaldehyde resin adhesive for E0 floor

A melamine and formaldehyde resin technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of high cost and complicated operation, prevent hydrolysis speed, reduce formaldehyde emission, The effect of improving the water-resistant adhesive strength

Inactive Publication Date: 2009-07-15
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 of urea-melamine-formaldehyde resin adhesive for E0 floor
  • Preparation of urea-melamine-formaldehyde resin adhesive for E0 floor
  • Preparation of urea-melamine-formaldehyde resin adhesive for E0 floor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] The first step: add 250g of formaldehyde solution, the first batch of melamine 7.5g, and the first batch of urea 84g into the reactor in a 500ml four-necked flask, adjust the pH to 7.5, raise the temperature to 80℃~90℃, and react for 40min.

[0029] Step 2: Adjust the pH to 5.0 and react at 90°C to the desired viscosity.

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

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

[0032]Step 5: Cool down to 70°C, add 29g of the third batch of urea, continue the reaction at 50°C for 30 minutes, and cool to discharge. Test its performance separately, and the results are listed in Table 1. And use 1% NH 4 Cl and 0.5% H 3 PO 4 For the curing agent pressed poplar plywood, the test results are shown in Table 2.

example 2

[0034] The first step: add 250 g of formaldehyde solution, the first batch of melamine 7.5 g, and the first batch of urea 84 g into the reactor in a 500 ml four-necked flask, adjust the pH to 8.0, heat up to 85° C., and react for 45 minutes.

[0035] Step 2: Adjust the pH to 5.5, and react to the desired viscosity at 90°C.

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

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

[0038] The fifth step: Cool down to 70°C, add 24g of the third batch of urea, continue the reaction at 60°C for 30 minutes, and cool and discharge. Test its performance separately, and the results are listed in Table 1. And use 1% NH 4 Cl and 0.5% H 3 PO 4 For the curing agent pressed poplar plywood, the test results are shown in Table 2.

example 3

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

[0041] Step 2: Adjust the pH to 5.8, and react to the desired viscosity at 90°C.

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

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

[0044] Step 5: Cool down to 70°C, add 29g of the third batch of urea, continue the reaction at 60°C for 30 minutes, and cool and discharge. Test its performance separately, and the results are listed in Table 1. And use 1% NH 4 Cl and 0.5% H 3 PO 4 For the curing agent pressed poplar plywood, the test results are shown in Table 2.

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Abstract

The invention discloses a method for preparing a urea-melamine-formaldehyde resin adhesive for an E0-level floor. In the first step, formaldehyde solution, melamine and urea are mixed, the pH value of the mixture is regulated, the temperature is raised to 80-95 DEG C, and the reaction lasts 40-60 minutes, wherein, the mol ratio between formaldehyde and the total amount of the urea and the melamine is 2.05-2.12 : 1; in the second step, the pH value is regulated to be 5.0-6.0, and the reaction is underway till the turbidity point; in the third step, the pH value is regulated to be 6.0-6.9, the urea and the melamine are added, and the mol ratio between the formaldehyde and the total amount of the urea and the melamine which are added in the first step and the second step is 1.48-1.74 : 1, and the reaction lasts 30-70 min at a temperature of 90 DEG C; in the fourth step, the pH value is regulated to be 7.5-9.0, the melamine is added, and the reaction lasts 20-80 min at a temperature of 80-90 DEG C; and in the fifth step, the urea is added, the mol ratio between the formaldehyde and the total amount of all the urea and all the melamine is 1.02-1.30 : 1, and the material is cooled and discharged after the reaction is finished. A veneer formed by pressing the resin adhesive has good boiled-water resistance and low formaldehyde release, and the reaction is gentle and also easy to control.

Description

Technical field [0001] The invention relates to a preparation method of an environmentally-friendly urea-formaldehyde resin adhesive for floors, in particular to an E 0 A method for preparing low-cost melamine-modified urea-formaldehyde resin adhesive for grade floor. 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 average. With the implementation of my country’s natural forest protection project, my country’s timber output has increased from 33.55 million m2 in 1997. 3 Reduced to 17.554 million m in 2000 3 , And relevant parties predict that the minimum demand for wood in my country from 2000 to 2010 is 200 million m 3 , There is a big contradiction between wood supply and demand. The efficient use of wood has become the main development direction of my country’s wood industry. It is estimated that 1m 3 Artificial board can replace 3.1m 3 The board made of logs, that is, the a...

Claims

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Application Information

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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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