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A kind of fir bark wood-based panel adhesive

A technology for adhesives and wood-based panels, which is applied in the direction of adhesives, adhesive types, and wooden veneer joints, etc., and can solve the problem of affecting the mechanical properties of the adhesive layer, large molecular weight, insufficient crosslinking of aldehydes or crosslinking agents, etc. problem, to achieve the effect of low cost, good bonding performance, and high moisture content of the veneer

Active Publication Date: 2020-11-06
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the process of preparing wood adhesives, people modify the lignin dissolved by alkaline method: hydroxymethylation reaction, demethylation reaction, phenolization reaction, sulfonation reaction, oxidation reaction, etc., to increase the activity of lignin However, the molecular weight of the modified lignin is still relatively large, and the aldehydes or cross-linking agents cannot fully cross-link between the lignin molecules, which will affect the mechanical properties of the adhesive layer.

Method used

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  • A kind of fir bark wood-based panel adhesive
  • A kind of fir bark wood-based panel adhesive

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Components: 80g fir bark powder, 40g urea-formaldehyde resin, 80g phenol, 3g urea, 1g mica powder, 1g gypsum powder, 0.5g nano silicon oxide, 0.1g polymethylhydrogen siloxane.

[0021] The particle size of the Chinese fir bark powder is 60 mesh, and the particle size of gypsum powder and mica powder is 150 mesh.

[0022] The preparation method of Chinese fir bark wood-based panel adhesive comprises the following processes:

[0023] (1) After mixing the Chinese fir bark powder and 6% sodium hydroxide solution at a mass ratio of 1:5, stir and heat to 80°C, and keep warm for 1.5h;

[0024] (2) After the material in step (1) is cooled to 60°C, add phenol and keep it warm for 25 minutes; then continue cooling to 50°C, add urea, and keep it warm for 6 minutes, then add mica powder, gypsum powder, nano silicon oxide, and oxane Surfactants were mixed and stirred for 3 minutes to obtain bark glue;

[0025] (3) Mix the bark glue with the urea-formaldehyde resin at room temperat...

Embodiment 2

[0029] Components: 85g fir bark powder, 50g urea-formaldehyde resin, 82g phenol, 4g urea, 1.2g mica powder, 1.8g gypsum powder, 0.55g nano silicon oxide, 0.15g polymethylhydrogen siloxane.

[0030] The particle size of the Chinese fir bark powder is 70 mesh, and the particle size of gypsum powder and mica powder is 150 mesh.

[0031] The preparation method of Chinese fir bark wood-based panel adhesive comprises the following processes:

[0032] (1) After mixing Chinese fir bark powder and 6% sodium hydroxide solution at a mass ratio of 1:6, stir and heat to 95°C, and keep warm for 1.2h;

[0033] (2) After the material in step (1) is cooled to 65°C, add phenol, and keep it warm for 22 minutes; then continue to cool to 45°C, add urea, and keep it warm for 8 minutes, then add mica powder, gypsum powder, nano silicon oxide, oxane Surfactants were mixed and stirred for 4 minutes to obtain bark glue;

[0034] (3) Mix the bark glue with the urea-formaldehyde resin at room temperatu...

Embodiment 3

[0038] Components: 100g fir bark powder, 60g urea-formaldehyde resin, 85g phenol, 5g urea, 2g mica powder, 2g gypsum powder, 0.6g nano silicon oxide, 0.2g polymethylhydrogen siloxane.

[0039] The particle size of the Chinese fir bark powder is 70 mesh, and the particle size of gypsum powder and mica powder is 160 mesh.

[0040] The preparation method of Chinese fir bark wood-based panel adhesive comprises the following processes:

[0041] (1) After mixing the Chinese fir bark powder and 8% sodium hydroxide solution in a mass ratio of 1:6, stir and heat to 100° C., and keep warm for 1 hour;

[0042] (2) After the material in step (1) is cooled to 70°C, add phenol, and keep it warm for 20 minutes; then continue to cool to 40°C, add urea, and keep it warm for 10 minutes, then add mica powder, gypsum powder, nano silicon oxide, oxane Surfactants were mixed and stirred for 5 minutes to obtain bark glue;

[0043] (3) Mix bark glue with urea-formaldehyde resin and stir evenly at r...

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Abstract

The invention belongs to the technical field of construction materials and discloses a Chinese fir bark adhesive for artificial boards. The Chinese fir bark adhesive is prepared from, by weight, 80-100 parts of Chinese fir bark powder, 40-60 parts of urea resin, 80-85 parts of phenol, 3-5 parts of urea, 1-2 parts of mica powder, 1-2 parts of gypsum powder, 0.5-0.6 part of nano silicon oxide and 0.1-0.2 part of a siloxane surfactant. The invention further provides a preparation method of the adhesive according to components of Chinese fir bark. The preparation method includes: treating Chinesefir bark powder with sodium hydroxide solution containing H2O2, lignin peroxidase and acetylacetone; subjecting the treated Chinese fir bark powder to reaction with phenol and urea, and mixing with mica powder, gypsum powder, nano silicon oxide and the siloxane surfactant to obtain bark adhesive; mixing the bark adhesive with urea formaldehyde resin. The Chinese fir bark adhesive has advantages ofhigh adhesive strength, water resistance, weather resistance and hardness and low free formaldehyde emission.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a fir bark wood-based panel adhesive. Background technique [0002] With the development of modern wood processing industry, my country's wood-based panel industry is growing rapidly, and the amount of wood adhesives is also increasing; according to relevant statistics, the global production of wood adhesives accounts for about 3 / 4 of the total output of adhesives. At present, there are three kinds of wood adhesives used most in my country's wood-based panel industry: urea-formaldehyde resin (UF) glue, phenolic resin (PF) glue, melamine-formaldehyde resin (MF) glue; these three kinds of glue belong to aldehyde adhesives, have their own characteristic. UF has good bonding performance, certain water resistance, low cost, and a wide range of uses. It is mainly used for furniture manufacturing and interior decoration; It will release free formaldehyde, which will pollute ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J197/00C09J161/24C09J11/04C09J11/08C09J11/06B27D1/08
Inventor 吴志刚梁坚坤李利芬余丽萍席雪冬张本刚李城
Owner GUIZHOU UNIV
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