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Plywood glue and preparation method thereof

A plywood and glue technology, applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve problems such as lack of production capacity, achieve low production costs, improve product quality, and simple and reasonable processes Effect

Inactive Publication Date: 2014-04-30
广西宾阳县荣良农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most small and medium-sized enterprises in China do not have such production capacity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) According to the molar ratio, add polyvinyl alcohol to 100 times of formaldehyde, react for 10 minutes, stir and add alkali, adjust pH=10.5;

[0014] (2) Add urea to the mixture obtained in step 1, the amount of urea added is 1:5 based on the molar ratio of formaldehyde, raise the temperature to 70°C, keep it for 1h, adjust the pH to 6 with HCl, and cool down to 40°C;

[0015] (3) Then adjust the pH to 5, after 30 minutes, adjust to 4.1, add melamine twice the amount of urea in step 2, then add the same amount of urea in step 2, stir and heat up to 80°C until the solution viscosity reaches 5000mPa s, adjust the pH to 8.0;

[0016] (4) Heat up the obtained solution for vacuum dehydration, then cool down to 35°C, adjust the pH to 6.6, and release the gel to obtain the product.

Embodiment 2

[0018] (1) According to the molar ratio, add polyvinyl alcohol to 160 times of formaldehyde, react for 10 minutes, stir and add alkali, adjust pH=10.5;

[0019] (2) Add urea to the mixture obtained in step 1, the amount of urea added is 1:5.5 based on the molar ratio of formaldehyde, the temperature is raised to 70°C, kept for 1h, the pH is adjusted to 6.5 with HCl, and the temperature is lowered to 40°C;

[0020] (3) Adjust the pH to 5, after 30 minutes, adjust to 4.3, add melamine that is 3 times the amount of urea in step 2, then add an equal amount of urea in step 2, stir and heat up to 80°C until the solution viscosity reaches 5000mPa s, adjust the pH to 8.2;

[0021] (4) Heat up the obtained solution for vacuum dehydration, then lower the temperature to 35°C, adjust the pH to 7, and release the gel to obtain the product.

Embodiment 3

[0023] (1) According to the molar ratio, add polyvinyl alcohol to 120 times of formaldehyde, react for 10 minutes, stir and add alkali, adjust pH=10.5;

[0024] (2) Add urea to the mixture obtained in step 1, the amount of urea added is based on the molar ratio of formaldehyde to 1:5.3, heat up to 70°C, keep for 1h, adjust the pH to 6.3 with HCl, and cool down to 40°C;

[0025] (3) Adjust the pH to 5 again, and after 30 minutes, adjust to 4.3, add melamine that is 2.5 times the amount of urea in step 2, then add an equal amount of urea in step 2, stir and heat up to 80°C until the solution viscosity reaches 5000mPa s, adjust the pH to 8.1;

[0026] (4) Warm up the obtained solution for vacuum dehydration, then lower the temperature to 35°C, adjust the pH to 6.8, and release the gel to obtain the product.

[0027] The adhesive properties that the present invention makes are as follows:

[0028] 1. Viscosity

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Abstract

The invention relates to plywood glue and a preparation method thereof. According to the plywood glue, urea is added into formaldehyde containing polyvinyl alcohol by specific ratio and program so as to guarantee the environmental protection property of the glue; the process is simple and reasonable and the production cost is low; gelling is not caused in a production process and the glue is not sprayed; the production is safe and stable and the storage period is long.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a plywood glue and a production method thereof. Background technique [0002] In order to meet the growing demand for wood products, artificial fast-growing wood and small-diameter wood species will become the main raw materials for the wood processing industry. Therefore, making full use of felling residues, processing residues and inferior wood to develop wood-based panels and artificial glued products is one of the effective measures to solve the contradiction between wood supply and demand, and adhesives play a pivotal role in it. [0003] At present, in the world, according to the level of formaldehyde emission, it is divided into three levels: E2, E1, and E0, that is, E2 ≤ 30mg / 100g, E1 ≤ 9mg / 100g, E0 ≤ 3mg / 100g. The amount of formaldehyde is less than or equal to 3 mg, which is generally measured by the drilling method. At present, only Finland and Japan implement sim...

Claims

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Application Information

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IPC IPC(8): C09J161/30C08G12/38
Inventor 李益忠丘秋燕吴定超
Owner 广西宾阳县荣良农业科技有限公司
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