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Method for preparing HMMM resin

A technology of hexamethoxymethyl melamine and hexamethylol melamine, which is applied in the field of preparation of hexamethoxymethyl melamine resin, can solve the problems of formaldehyde gas overflow, affect the environment, endanger the health of workers, etc., and achieve stable performance, Good cross-linking effect and easy-to-operate effect

Inactive Publication Date: 2008-12-31
ZHANGJIAGANG SHUNCHANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the separation process, a large amount of formaldehyde gas will overflow, which will affect the environment and endanger the health of workers, making the operation impossible.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put melamine, paraformaldehyde and methanol into the reaction kettle with a material reaction molecular ratio of 1:8:15, adjust the pH value to 8 with sodium hydroxide, raise the temperature to 65°C, wait for hexamethylolmelamine to crystallize, and keep warm for 2.5 Cool down after hours. After cooling down, methanol and formic acid were added to adjust the pH value to 2.5 for etherification. The temperature was controlled at 65° C., and the reaction time was controlled at 15 hours. Then add sodium hydroxide to adjust to neutrality, vacuum dealcoholization and dehydration to obtain hexamethoxymethylmelamine resin.

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PUM

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Abstract

The invention discloses a preparation method for hexakis (methoxymethyl) melamine resin, namely, in the first step; 92% polyformaldehyde, melamine and methanol are reacted in alkaline environment through hydroxymethylation to generate the intermediate product hexamethylolmelamine crystals; in the second step, the intermediate product and methanol are reacted with organic acid through etherification to prepare the hexakis (methoxymethyl) melamine resin. The method of the invention is non-polluting, odorless and easy to operate. The hexakis (methoxymethyl) melamine resin produced through the method of the invention is stable and non-crystalline, which is used in coiled materials and baking varnish, with very good cross-linking effect.

Description

technical field [0001] The invention relates to a preparation method of a crosslinking agent, in particular to a preparation method of hexamethoxymethylmelamine resin. Background technique [0002] At present, the known hexamethoxymethylmelamine resin adopts melamine, 37% formaldehyde solution and methanol as main raw materials in the synthesis. The process is as follows: melamine and formaldehyde solution undergo methylolation reaction under alkaline conditions to obtain hexamethylolmelamine crystals; hexamethylolmelamine reacts with methanol under acidic conditions to generate hexamethoxymethyl Melamine. In this process, water is the medium of the first step reaction, which is introduced by 37% formaldehyde solution. In the second step reaction, methanol is the medium, and the existence of water will affect the degree of etherification, so it must be carried out before the second step reaction. The material is separated from water and excess formaldehyde. However, durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/70
Inventor 赵玉莲顾丰平
Owner ZHANGJIAGANG SHUNCHANG CHEM