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Method for preparing melamine modified urea-formaldehyde resin adhesive

A technology of urea-formaldehyde resin glue and melamine, which is applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problem of reducing the performance and service life of wood-based panels, the waterproof performance has not been significantly improved, and artificial The board is easy to absorb moisture and deform, and achieve the effect of reducing expansion rate, good waterproof performance and high stiffness

Active Publication Date: 2016-06-01
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, although the technical solutions in the above patent documents reduce the formaldehyde content of urea-formaldehyde resin, its stability, bonding strength, and waterproof performance have not been significantly improved. Make the wood-based panel easy to absorb moisture and deform, which will greatly reduce the performance and service life of the wood-based panel

Method used

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  • Method for preparing melamine modified urea-formaldehyde resin adhesive

Examples

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Effect test

Embodiment 1

[0023] A preparation method of melamine modified urea-formaldehyde resin glue, comprising the following steps:

[0024] (1) First heat the formaldehyde in the container to 35°C, add a NaOH solution with a mass concentration of 35% to adjust the pH value to 8.3, add the first batch of urea and melamine; the addition of the first batch of urea is 33% of the mass of formaldehyde %, the addition of melamine is 6% of the quality of formaldehyde;

[0025] (2) Stop heating when the temperature rises to 70°C, allow it to release heat naturally, then raise the temperature to 85°C, keep time and keep warm for 30 minutes, and slowly add formic acid solution with a mass concentration of 20% within 25-30 minutes, so that The pH value of the reaction solution is adjusted to 5.8. After the pH value is adjusted, measure the viscosity with a four-cup every 5 minutes, and measure the viscosity continuously when approaching the end point. Add NaOH solution with a concentration of 35% to adjust ...

Embodiment 2

[0029] A preparation method of melamine modified urea-formaldehyde resin glue, comprising the following steps:

[0030] (1) First heat the formaldehyde in the container to 35°C, add a NaOH solution with a mass concentration of 35% to adjust the pH value to 8.5, add the first batch of urea and melamine; the addition of the first batch of urea is 33% of the mass of formaldehyde %, the addition of melamine is 6% of the quality of formaldehyde;

[0031] (2) Stop heating when the temperature rises to 70°C, allow it to release heat naturally, then raise the temperature to 88°C, time and keep warm for 30 minutes, and slowly add formic acid solution with a mass concentration of 20% within 25-30 minutes, so that The pH value of the reaction solution is adjusted to 6.3. After the pH value is adjusted, the viscosity is measured with a four-cup every 10 minutes. When approaching the end point, the viscosity is continuously measured. The viscosity of the four-cup at the end is controlled a...

Embodiment 3

[0035] A preparation method of melamine modified urea-formaldehyde resin glue, comprising the following steps:

[0036] (1) First heat the formaldehyde in the container to 35°C, add a NaOH solution with a mass concentration of 35% to adjust the pH value to 8.4, add the first batch of urea and melamine; the addition of the first batch of urea is 33% of the mass of formaldehyde %, the addition of melamine is 6% of the quality of formaldehyde;

[0037] (2) Stop heating when the temperature rises to 70°C, allow it to release heat naturally, then raise the temperature to 86°C, time and keep warm for 30 minutes, and slowly add formic acid solution with a mass concentration of 20% within 25-30 minutes, so that The pH value of the reaction solution is adjusted to 6.0. After the pH value is adjusted, measure the viscosity with the four cups every 8 minutes, and measure the viscosity continuously when approaching the end point. Add NaOH solution with a concentration of 35% to adjust th...

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Abstract

The invention relates to the technical field of wood processing, in particular to a method for preparing a melamine modified urea-formaldehyde resin adhesive.The method for preparing the melamine modified urea-formaldehyde resin adhesive comprises the following steps of adding a first batch of urea and melamine, adding a second batch of urea, adding a third batch of urea and mixing adhesive.The melamine modified urea-formaldehyde resin adhesive obtained through the method is long in storage life, good in stability, high in bonding strength and good in waterproof performance, and the thickness swelling rate of water absorption of an artificial board can be effectively reduced; the melamine modified urea-formaldehyde resin adhesive can be used for manufacturing plywood and wet curtain paper and can also be used in the fields of fiberboard manufacturing, chipboard manufacturing and other water solubility resin application.

Description

technical field [0001] The invention relates to the technical field of wood processing, in particular to a preparation method of melamine-modified urea-formaldehyde resin glue. Background technique [0002] Urea-formaldehyde resin (UF), also known as urea-formaldehyde resin, is the polycondensation of urea and formaldehyde under the action of a catalyst (alkaline or acidic catalyst) to form an initial urea-formaldehyde resin, and then under the action of a curing agent or an additive to form an insoluble, infusible End-stage thermosetting resin. The color of cured urea-formaldehyde resin is lighter than that of phenolic resin, translucent, resistant to weak acid and weak alkali, good insulation performance, excellent wear resistance, and cheap. Urea-formaldehyde resin glue is the most used variety of adhesives, especially in the manufacture of various wood-based panels in the wood processing industry, urea-formaldehyde resin and its modified products account for about 90% o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/32C08G12/42
CPCC08G12/428C09J161/32
Inventor 刁海林李绍钦陈其明宋庆华
Owner GUANGXI UNIV
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