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Preparation of methyl butyl complex etherified melamine formaldehyde resin

A technology for etherifying melamine and formaldehyde resin, which is applied in the field of preparation of etherified melamine formaldehyde, can solve the problem of no localization and the like, and achieve the effect of high adhesion

Inactive Publication Date: 2009-06-24
上海华谊精细化工有限公司上海新华树脂厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, most of the above-mentioned resin production techniques reported abroad use 55% formaldehyde aqueous solution or paraformaldehyde as raw material, because this raw material is not yet domestically produced, therefore, it is necessary to seek to develop methyl butane with domestic raw materials (37% by weight aqueous formaldehyde solution). The approach of mixed etherified melamine formaldehyde resin

Method used

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  • Preparation of methyl butyl complex etherified melamine formaldehyde resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put 30g of melamine and 102g of 37% formaldehyde solution into the reaction kettle, add 30% sodium hydroxide solution, adjust the pH=10, stir and heat up, and react at a temperature of 65°C for 2 hours; cool to 45°C, add 99g of methanol and 37 % hydrochloric acid, adjust pH=4, react for 1 hour; add 30% sodium hydroxide solution, adjust pH=10, and distill under reduced pressure; cool to 45°C, add methanol 70g and 37% hydrochloric acid, adjust pH=2, react for 1.5 hours Add 30% sodium hydroxide solution, adjust pH=10, and distill under reduced pressure; Add butanol 120g and p-toluenesulfonic acid 0.6g, heat up to 100°C, keep 1 hour; Add 30% sodium hydroxide solution, adjust pH= 10. Distill under reduced pressure and filter to obtain methyl butyl mixed etherified melamine formaldehyde resin.

Embodiment 2

[0029] Put 50g of melamine and 80g of 37% formaldehyde solution into the reaction kettle, add 30% sodium hydroxide solution, adjust the pH=9, stir and heat up, and react at a temperature of 50°C for 3 hours; cool to 35°C, add methanol 138g and 37 % hydrochloric acid, adjust pH=4, react for 3 hours; add 30% sodium hydroxide solution, adjust pH=10, and distill under reduced pressure; cool to 35°C, add methanol 114g and 37% hydrochloric acid, adjust pH=2, react for 1 hour Add 30% sodium hydroxide solution, adjust pH=10, and distill under reduced pressure; add 180g butanol and 1g p-toluenesulfonic acid, heat up to 120°C, and keep for 1 hour; add 30% sodium hydroxide solution, adjust pH=10, Distill under reduced pressure and filter to obtain methyl butyl mixed etherified melamine formaldehyde resin.

Embodiment 3

[0031] Put 40g of melamine and 95g of 37% formaldehyde solution into the reaction kettle, add 30% sodium hydroxide solution, adjust the pH=8, stir and heat up, and react at a temperature of 80°C for 1 hour; cool to 55°C, add methanol 125g and 37 % hydrochloric acid, adjust pH=2, react for 2 hours; add 30% sodium hydroxide solution, adjust pH=12, and distill under reduced pressure; cool to 35°C, add methanol 92g and 37% hydrochloric acid, adjust pH=4, react for 2 hours ;Add 30% sodium hydroxide solution, adjust pH=12, and distill under reduced pressure; Add 160g butanol and 0.9g p-toluenesulfonic acid, adjust pH=3, raise the temperature to 110°C, keep for 2 hours; add 30% sodium hydroxide solution , adjust pH=11, distill under reduced pressure, and filter to obtain methyl butyl mixed etherified melamine formaldehyde resin.

[0032] The measured values ​​of the main technical properties of the methyl butyl mixed etherified melamine formaldehyde resin products obtained in Example...

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Abstract

The invention discloses a method for preparing a methyl-butyl mixed etherified melamine formaldehyde resin by taking paratoluenesulfonic acid-butanol solution as a catalyst. The method is characterized in that the melamine formaldehyde resin is prepared from the following components calculated by weight percentages: 20-30% of 37% formaldehyde solution, 10-25% of melamine, 20-50% of methanol and 20-50% of butanol. In the method, domestic 37wt / % aqueous methanol solution is taken as a raw material, and alkali and acid are employed to adjust the pH value of a reaction system, thus controlling the reaction rate.

Description

technical field [0001] The invention relates to the specialty of macromolecular materials in the field of chemical industry, in particular to a synthetic resin suitable for coating application, i.e. a preparation method of etherified melamine formaldehyde. Background technique [0002] Melamine formaldehyde resin is a polymer obtained by the reaction of melamine and formaldehyde. It is also called melamine formaldehyde resin or melamine resin. After the crosslinking reaction of this resin through processing and molding, an insoluble and infusible product is formed. It is colorless and transparent. It is stable in boiling water and can even be used at 150°C, and has good mechanical properties. The etherified melamine formaldehyde resin modified by alcohol etherification can be used as coating and thermosetting paint. [0003] The research and production of melamine formaldehyde resin abroad began in the 1930s. At the end of the 1970s, the American cyanamide company first la...

Claims

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Application Information

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IPC IPC(8): C08G12/42C08G12/32
Inventor 李惠琼廖群晖
Owner 上海华谊精细化工有限公司上海新华树脂厂
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