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Preparation method of hexamethoxymethyl melamine resin

A technology of hexamethoxymethyl melamine and hexamethylol melamine, which is applied in the field of preparation of hexamethoxymethyl melamine resin, can solve problems such as incomplete reaction, and achieve the effect of maintaining purity

Inactive Publication Date: 2013-05-08
JIANGSU GUOLI CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The commonly used hexamethoxymethylmelamine resin reacts with methanol under acidic conditions with hexamethoxymethylmelamine. The commonly used catalyst is an organic acid. Because the organic acid does not completely react during neutralization, and it is easy to produce intermediates with the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] In a 20000L reactor, first add 5000kg of hexamethylolmelamine and 6000kg of refined methanol, and stir;

[0011] Raise the temperature to 48~58°C, add dilute sulfuric acid for etherification, keep the pH at 2~3, keep the temperature unchanged, and keep the temperature for 100 minutes after the material becomes clear;

[0012] Keep the temperature, add 60kg of sodium hydroxide to neutralize, the pH reaches 7.5~8.5, and keep the reaction time for 10 minutes;

[0013] Heating up to recover methanol;

[0014] The obtained hexamethylol melamine resin was cooled in the clear night obtained after the recovery of methanol.

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PUM

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Abstract

The invention relates to a preparation method of a crosslinking agent, and particularly relates to a preparation method of a hexamethoxymethyl melamine resin. The preparation method the technical processes of etherification, neutralization and distillation. According to the invention, inorganic acid is used as a catalyst, complete neutralization can be performed, no intermediate products can be generated, and the product purity can be kept.

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] The commonly used hexamethoxymethylmelamine resin reacts with methanol under acidic conditions with hexamethylolmelamine. The commonly used catalyst is an organic acid, because the organic acid does not completely react during neutralization, and it is easy to produce an intermediate with the product. Contents of the invention [0003] For above-mentioned technical problem, the present invention provides a kind of hexamethoxymethyl melamine resin production process that acid can neutralize fully, and concrete technical scheme is: [0004] (1) Add methanol and hexamethylolmelamine in the reaction kettle with a weight ratio of 1.2:1 and stir; [0005] (2) Raise the temperature to 48~58℃, add sulfuric acid for etherification, keep the pH at 2~3, keep the temperature unchanged, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/70
Inventor 胡立新郎旭东宗红兴
Owner JIANGSU GUOLI CHEM TECH
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