High-gloss anti-crack adhesive for multilayer plywood and method for manufacturing multilayer plywood

A plywood and adhesive technology, applied in the direction of adhesives, chemical instruments and methods, aldehyde/ketone condensation polymer adhesives, etc., can solve the problems of easy delamination and low brightness of multi-layer plywood

Active Publication Date: 2013-08-28
ZHEJIANG DILONG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of easy delamination and low brightness of multi-layer plywood in the prior art, the present invention provides a high-gloss anti-cracking adhesive for multi-layer plywood, so that the adhesive film formed by dipping the glue can reach High gloss, the multi-layer composite plywood made by compounding is hot-pressed and stable, has high adhesive strength, high brightness, and its warpage and deformation rate are extremely small during use, and there is almost no cracking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of urea-formaldehyde resin glue

[0031] Add formaldehyde into the reaction kettle at one time, adjust the pH value to 6.5~7.5 with sodium hydroxide after heating up, add 475kg of urea for the first time, raise the reaction temperature to 88°C and keep it warm for 30 minutes, adjust with formic acid at a volume ratio of 1:1 The pH value is between 4.0-4.2, react until the water solubility ratio reaches 1:2.0~2.5 (the water solubility ratio indicates the water miscibility, see GB / T14074.6-1993 for details), adjust the pH value with sodium hydroxide 5.0~9.0 and cool down to 60°C, add 225kg for the second time, keep warm for 30 minutes, cool down and add 400kg, when the temperature drops to 35-40°C, the urea-formaldehyde resin glue is obtained, and the molar ratio of the total amount of urea to formaldehyde is 1 : 1.2, the pH value of urea-formaldehyde resin glue is 6.5-6.8, the viscosity is 14-15s / B4.20℃, the ratio of resin to water 1: 2.3-2.7 / 20℃ (the ratio ...

Embodiment 2

[0045] Preparation of urea-formaldehyde resin glue

[0046] High-gloss anti-cracking adhesive for multi-layer plywood. Multi-layer plywood is glued and laminated by single-layer materials. The adhesive includes urea-formaldehyde resin glue and additives added to it, melamine resin glue and additives added to it. agent.

[0047] Urea-formaldehyde resin glue is made by the following preparation method: add formaldehyde into the reaction kettle at one time, adjust the pH value to 8.5~10.5 with sodium hydroxide after heating up, add urea for the first time, and the amount added is 2 / 3 of the total weight of urea , the reaction temperature was raised to 88°C and kept for 30 minutes, the pH value was adjusted to about 4.0-4.2 with formic acid at a volume ratio of 1:1, and the pH value was adjusted with sodium hydroxide when the water-soluble ratio reached 1:2.0-2.5 5.0~6.0 and lower the temperature to 60°C, add the remaining 1 / 3 urea and keep it warm for 30 minutes, then cool down ...

Embodiment 3

[0054] High-gloss anti-crack adhesive for multi-layer plywood consisting of single layers of material glued to each other.

[0055] The adhesive includes urea-formaldehyde resin glue and auxiliary agents added therein, melamine resin glue and auxiliary agents added therein.

[0056] The urea-formaldehyde resin glue is made by the following preparation method: add formaldehyde into the reaction kettle at one time, adjust the pH value to 8.8 with sodium hydroxide after heating up, add urea for the first time, the amount is 2 / 3 of the total weight of urea, react Raise the temperature to 88°C and keep it warm for 30 minutes. Use formic acid with a volume ratio of 1:1 to adjust the pH value to about 4.0-4.2. When the water-soluble ratio reaches 1:2.3, use sodium hydroxide to adjust the pH value to 6.0 and cool down to 60°C, add the remaining 1 / 3 urea and keep it warm for 30 minutes, cool down and add water. The amount of water added is 9.23% of the total weight. When the temperatur...

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Abstract

A high-gloss anti-crack adhesive for multilayer plywood is provided. The multilayer plywood is mutually glued and laminated by a single layer material. The adhesive includes a urea-formaldehyde resin adhesive and additive and added additives therein, a melamine resin adhesive and added additives therein. The preparation methods of the urea-formaldehyde resin adhesive and the melamine resin adhesive are creatively improved by inventors. The free formaldehyde in the obtained adhesive is less than 0.1%. Operation is easy, equipment is easy to get, no pollution generates, implementation is easy and price is inexpensive. The high-gloss anti-crack adhesive can be used for the multi-layer plywood, has excellent pre-pressing property, can mold at room temperature in 30-40 min, and has bonding strength >= 1.0 MPa, formaldehyde emission <= 1.0 mg / L, which is below requirements of GB / T18580-2001 E1 level, and gloss >= 85 DEG. In the environment with sudden changes in temperature, the high-gloss anti-crack adhesive has the advantages of preventing wear-resistant material cracking and bubbling as a result of thermal expansion and cool contraction.

Description

[0001] technical field [0002] The invention belongs to the technical field of decorative materials, and in particular relates to a high-gloss anti-crack adhesive for multi-layer plywood. Background technique [0003] With the continuous advancement of science and technology in our country, the decorative paper industry is currently prosperous, and the concept of replacing wood with paper has been deeply rooted in the hearts of the people. Therefore, the market for producing and processing various decorative panels with decorative paper and wood-based panels as raw materials is also expanding. The board is to paste the decorative paper directly on the surface of the wood-based panel, so that they are in close contact. In order to solve the problem of the surface gloss, generally after the decorative paper is pasted, a layer of glossy paint or paint is applied on the surface. Brushing with materials similar to glossy paper keeps the surface smooth, but in actual production, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/24C09J161/32C09J11/00C08G12/12C08G12/40B32B37/06B32B37/12B32B7/12
Inventor 姜飞雄朱玉华张海峰方敏
Owner ZHEJIANG DILONG NEW MATERIAL
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