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Production method for environment-friendly type middle-density board glue

A production method and density board technology, applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve the problems of great harm to the human body, environmental pollution, high formaldehyde release, etc., and achieve a simple preparation process Ease of operation, stable performance, and enhanced strength

Inactive Publication Date: 2007-10-31
SHANDONG HEYOU GROUP
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AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the present invention provides an environment-friendly density board urea-formaldehyde resin glue to solve the problem of high formaldehyde release of common urea-formaldehyde resin glue, serious environmental pollution and great harm to human body.

Method used

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Embodiment Construction

[0009] 1. Prepare raw materials: Measure the following raw materials as 98kg of formaldehyde, 0.7kg of sodium hydroxide, 705kg of urea, 1.4kg of melamine, 0.74kg of ammonia water, and 0.25kg of PVA for future use.

[0010] 2. Configuration: Put the measured formaldehyde and other above-mentioned materials into the reaction kettle, and start the agitator. Add 25% sodium hydroxide solution to adjust the pH to 7.5-8.0, add the first batch of urea 380kg and melamine 1.4kg, and heat up. The temperature was raised to 90±2°C and kept for 30 minutes. Add 98kg of 30% formaldehyde solution, adjust the pH=4.8-5.0, measure the viscosity, after the viscosity rises to 18 seconds (25°C for the coated dish cup), adjust the pH=7.0, add 150kg of secondary urea, and keep warm for half an hour. Half an hour later, cool down with water, add 175kg of urea and 0.74kg of ammonia water three times, and when it drops to 38°C, adjust the pH to 7.5-8.0, and put it in a rubber storage tank for 24 hours. ...

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Abstract

The invention discloses a preparing method of environment-friendly type density plate glue, which comprises the following steps: changing mole ratio of traditional urea-formaldehyde resin formaldehyde and aquacare; adding melamine into urea-formaldehyde resin; proceeding polycondensation; changing twice throwing aquacare to third throwing aquacare; allocating formaldehyde, caustic soda, aquacare, melamine, ammonia and PVA; checking the end product. This craft possesses simple craft and stable property, which increases the total quality to another stage.

Description

technical field [0001] The invention relates to a preparation process of an environment-friendly adhesive for medium-density boards. Background technique [0002] Ordinary urea-formaldehyde resin is made by addition and polycondensation of formaldehyde and urea. The board produced with it has high formaldehyde emission, serious environmental pollution and great harm to human body. And it has the disadvantages of low strength, soft core layer and thick pre-cured layer. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the present invention provides an environment-friendly density board urea-formaldehyde resin glue to solve the problems of high formaldehyde emission, serious environmental pollution and great harm to the human body of ordinary urea-formaldehyde resin glue. The strength of the board produced is low, the core layer is soft, and the pre-cured layer is thick. [0004] The technical solution of the present invention is ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/24C09J161/28
Inventor 陈立言
Owner SHANDONG HEYOU GROUP
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