Preparation method of E0-grade melamine modified urea formaldehyde resin

A technology of melamine and urea-formaldehyde resin, which is applied in the field of urea-formaldehyde resin production, can solve the problems of high free formaldehyde, bonding strength, poor storage stability and water solubility, and achieve the effects of reducing formaldehyde release, increasing viscosity and reducing cost

Active Publication Date: 2016-02-24
广西沃森木业科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of high free formaldehyde, in recent years, the method of reducing the molar ratio of formaldehyde and urea is mainly used to produce urea-fo

Method used

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  • Preparation method of E0-grade melamine modified urea formaldehyde resin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Raw material formula of urea-formaldehyde resin:

[0037] Raw material components

Parts by weight of each component (Kg)

formaldehyde

542.13

The first batch of urea

182.96

The second batch of urea

83.24

The third batch of urea

166.48

Melamine

19.81

polyvinyl alcohol

5.37

sodium hydroxide

Appropriate amount

formic acid

Appropriate amount

[0038] 2. The specific reaction steps are as follows:

[0039] To produce 1000 kg of E0 grade melamine-modified urea-formaldehyde resin, add 542.13Kg of formaldehyde solution and 5.37Kg of polyvinyl alcohol with a weight fraction of 37% to the reactor, heat the reactor with steam, and adjust the temperature of the reactor. When the temperature of the reaction solution reaches 60 °C, react for 10 minutes to obtain the first reaction solution.

[0040]Adjust the pH=8.0 of the first reaction solution described in the section wit...

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Abstract

The invention provides a preparation method of E0-grade melamine modified urea formaldehyde resin. According to the preparation method, formaldehyde, urea, polyvinyl alcohol and melamine are selected as main raw materials; urea is added in three batches, so that the molar ratios of the first, second and third batches of urea to formaldehyde are 1:2.24, 1:1.54 and 1:0.95 respectively; polyvinyl alcohol and melamine are respectively added into a reaction kettle before and during an addition reaction, so that the raw materials can be subjected to reactions in four media of which the pH values are 7.5-8.0, 5.1-5.0, 6.2-6.5 and 8.0-8.5 respectively; finally, E0-grade melamine modified urea formaldehyde resin is prepared. The preparation method has the advantages that addition of a formaldehyde catching agent is not needed; the preparation process is simple; the bonding strength, the waterproof property and the pre-pressing effect of the product, namely E0-grade melamine modified urea formaldehyde resin, are improved; the E0-grade requirement for free formaldehyde can be met; the market application range is broad.

Description

technical field [0001] The invention relates to the technical field of urea-formaldehyde resin production, in particular to E0 grade melamine-modified urea-formaldehyde resin for interior decorative boards. Background technique [0002] Urea-formaldehyde resin is the most widely used adhesive in the wood industry. The urea-formaldehyde resin produced from urea and formaldehyde by conventional methods has a high free formaldehyde content, and there are inevitably a large number of methylol and ether bonds in the resin molecule. Causes of formaldehyde release and poor water resistance during the curing process of wood-based panels. [0003] Urea-formaldehyde resin is actually a mixture of free formaldehyde, methylol urea, urea-formaldehyde polymer and methylolated urea-formaldehyde. The formaldehyde release of wood-based panels made of urea-formaldehyde resin mainly comes from: free formaldehyde of urea-formaldehyde resin, and urea-formaldehyde resin during hot-press curing. ...

Claims

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Application Information

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IPC IPC(8): C08G12/40C08G12/38
CPCC08G12/38C08G12/40
Inventor 潘立稳詹华东
Owner 广西沃森木业科技有限公司
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