Bamboo fiber flakeboard adhesive and preparation method of bamboo fiber flakeboard adhesive

A particleboard, adhesive technology, applied in adhesive types, aldehyde/ketone condensation polymer adhesives, adhesives, etc., can solve problems such as poor water resistance and heat resistance, chronic respiratory diseases, gene mutations, or leukemia , to achieve the effect of reducing curing time, reducing free urea, and simple production process

Inactive Publication Date: 2013-12-25
CHISHUI XINSHENG BAMBOO FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water resistance and heat resistance of urea-formaldehyde resin are poor, and urea-formaldehyde resin will release formaldehyde, and formaldehyde is a toxic substance. Long-term inhalation of low-level formaldehyde can easily cause chronic respiratory diseases, gene mutations or leukemia, etc., so urea-formaldehyde resin is not suitable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] Bamboo fiber particle board adhesive, by weight percentage is:

[0024] Formaldehyde solution 32%

[0025] Sodium Hydroxide Solution 20%

[0026] Urea 31%

[0027] Ammonium Chloride Solution 6%

[0028] Formic acid 5%

[0029] Water Repellent Solution 3%

[0030] Polyvinyl Alcohol 3%

[0031] Preparation method of bamboo fiber particle board adhesive, it may further comprise the steps:

[0032] Step 1: Put formaldehyde solution into the reaction kettle, adjust the pH value to 8.0-8.6, and add the first batch of urea and water repellent solution;

[0033] Step 2: When the temperature rises to 40°C, add polyvinyl alcohol, keep it warm for 10-30 minutes at 90°C, and adjust the pH value to 5.2 with formic acid;

[0034] Step 3: After 10-30 minutes, add the second batch of urea. After measuring the viscosity to meet the requirements, add sodium hydroxide solution to adjust the pH value to 7.8-8.0, and cool down;

[0035] Step 4: Add the third batch of urea at 80°C; ...

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PUM

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Abstract

The invention discloses a bamboo fiber flakeboard adhesive and a preparation method of the bamboo fiber flakeboard adhesive. The adhesive includes, by matching ratio, 32% of formaldehyde solution, 20% of sodium hydroxide solution, 31% of urea, 6% of ammonium chloride solution, 5% of formic acid, 3% of waterproof agent and 3% of polyvinyl alcohol. The preparation method includes the steps that the formaldehyde solution is added into a reaction still, and the first batch of urea and the waterproof solution are added in; when the temperature is raised to 40 DEG C, the polyvinyl alcohol is added in, and the temperature is kept for 10-30 min when being raised to 90 DEG C; after 30 min, the second batch of urea is added in, the sodium hydroxide solution is added in and the temperature is lowered; the third batch of urea is added in when the temperature is 80 DEG C; the fourth batch of urea is added in when the temperature is 68 DEG C; discharging is performed when the temperature is lower than 40 DEG C. According to the bamboo fiber flakeboard adhesive and the preparation method of the bamboo fiber flakeboard adhesive, the molar ratio is 0.3, free urea in resin is decreased, and the joint degree of the adhesive is improved; the curing time of a surface layer is shortened, free formaldehyde in the resin is captured, the release amount of the free formaldehyde is reduced and is reduced to 5.5mg /100 g from 27mg /100g, the processing process is simple, the bonding strength is high, and environment friendliness is achieved.

Description

technical field [0001] The invention relates to an adhesive, in particular to a bamboo fiber particleboard adhesive and a preparation method thereof, belonging to the technical field of bamboo and wood processing. Background technique [0002] At present, the widely used adhesive for bamboo products is urea-formaldehyde resin. The traditional particle board adhesive formula: by weight percentage: formaldehyde solution 37%; sodium hydroxide solution 20%; urea 40%; ammonium chloride solution 3%. However, the water resistance and heat resistance of urea-formaldehyde resin are poor, and urea-formaldehyde resin will release formaldehyde, and formaldehyde is a toxic substance. Long-term inhalation of low-level formaldehyde can easily cause chronic respiratory diseases, gene mutations or leukemia, etc., so urea-formaldehyde resin is not suitable. Contents of the invention [0003] The purpose of the present invention is in order to overcome the deficiencies in the prior art, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/24C08G12/12
Inventor 陈显新
Owner CHISHUI XINSHENG BAMBOO FIBER
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