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Method for preparing melamine-urea-formaldehyde resin adhesives for outdoor plywood low in formaldehyde release

A technology with low formaldehyde release and melamine, applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesives, manufacturing tools, etc., can solve the problems of reducing phenolic resin glue, dark color, etc., achieve fast curing speed, simple preparation process, Good reproducibility effect

Inactive Publication Date: 2012-11-14
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

CN102140156A introduces that urea can replace 26% to 80% of phenol, and the PUF resin made by using composite catalyst under alkaline conditions can produce E 0 Class I plywood can greatly reduce the cost of phenolic resin glue, but the color of the glue is still relatively dark, and the temperature of the pressing plate still needs to be above 130°C

Method used

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  • Method for preparing melamine-urea-formaldehyde resin adhesives for outdoor plywood low in formaldehyde release
  • Method for preparing melamine-urea-formaldehyde resin adhesives for outdoor plywood low in formaldehyde release

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The second step: use 20%NH 4 Adjust the pH of the Cl solution to 5.8, and react to the cloud point at 90°C;

[0030] Step 3: Adjust the pH to 6.5 with 30% NaOH solution, add the second batch of melamine 10.5g and the second batch of urea 16g, and react at 90°C for 40min;

[0031] Step 4: Adjust the pH value to 8.5 with 30% NaOH solution, add the third batch of melamine 59g, and react at 85-90°C for 40 minutes;

[0032] Step 5: Lower the temperature to 70°C, add the third batch of urea 16g, continue the reaction at 60°C for 20 minutes, and cool and discharge.

[0033] Test its performance, the results are listed in attached table 1. 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 listed in Attached Table 2.

[0034]

[0035] Example 2

Embodiment 2

[0037] The second step: use 20%NH 4 Adjust the pH of the Cl solution to 5.7, and react to the cloud point at 90°C;

[0038] Step 3: Adjust the pH to 6.6 with 30% NaOH solution, add the second batch of melamine 12.0g and the second batch of urea 14g, and react at 89°C for 40min;

[0039] Step 4: Adjust the pH value to 8.7 with 30% NaOH solution, add the third batch of melamine 66g, and react at 89°C for 40min;

[0040] Step 5: Lower the temperature to 70°C, add the third batch of urea 14g, continue the reaction at 60°C for 20 minutes, and cool and discharge.

[0041] Test its performance, the results are listed in attached table 1. 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 listed in Attached Table 2.

[0042]

[0043] Example 3

Embodiment 3

[0045] The second step: use 20%NH 4 Adjust the pH of the Cl solution to 5.7, and react to the cloud point at 90°C;

[0046] Step 3: Adjust the pH to 6.8 with 30% NaOH solution, add the second batch of melamine 13.5g and the second batch of urea 12g, react at 88°C for 40min;

[0047] Step 4: Adjust the pH value to 8.2 with 30% NaOH solution, add the third batch of melamine 73g, and react at 89°C for 40min;

[0048] Step 5: Lower the temperature to 70°C, add the third batch of urea 12g, continue the reaction at 60°C for 20min, cool and discharge.

[0049] Test its performance, the results are listed in attached table 1. 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 listed in Attached Table 2.

[0050]

[0051] Example 4

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Abstract

The invention discloses a method for preparing melamine-urea-formaldehyde resin adhesives for outdoor plywood low in formaldehyde release. The method includes adding formaldehyde solution, melamine and urea into a reactor, adjusting pH value to the cloud point; adding urea and melamine for reaction; adding melamine, adding urea for subsequent reaction, and cooling before discharging. According to the convention process of alkali-acid-alkali, the melamine and the urea are added by three steps, ply bond of plywood made of plying the MUF (melamine, urea and formaldehyde) resin adhesives made of 16-20% of modified melamine is accordant with the requirements of the first type of plywoods. According to difference of usage the melamine and F / (M+U) mole ratio, the formaldehyde release of the plywood is accordant with the E1 level or E0 level. The method for preparing melamine-urea-formaldehyde resin adhesives is mild in reaction, easy to control and fine in repeatability, storage life of the adhesives is longer than 15 days. The MUF resin adhesives are lacte and faster in curing and are lower in temperature and cost than those of phenol glue.

Description

technical field [0001] The invention relates to a preparation method of melamine-modified urea-formaldehyde resin glue for environment-friendly outdoor plywood, in particular to an E 1 / E 0 Preparation of low-cost melamine-urea-formaldehyde resin glue for Class I plywood. [0002] Background technique [0003] In 2010, the total output of wood-based panels in my country was 153.6 million m 3 , of which plywood output is 71.4 million m 3 . According to the report of the China Adhesives Industry Association, the output of glue for wood-based panels in my country (based on 100% solids) is 7.8 million tons of urea-formaldehyde glue, 493,000 tons of phenolic glue, and 288,000 tons of melamine-formaldehyde glue. [0004] Phenolic resin glue has high bonding strength, excellent weather resistance and water resistance, and has become the first choice for outdoor wood-based panels. It is mainly used for outdoor plywood such as concrete formwork, car boards, and container floors....

Claims

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Application Information

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IPC IPC(8): C08G12/38C09J161/30B27D1/04
Inventor 赵临五储富祥王春鹏张伟石建军俞阳
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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