Production method of hexamethoxy methyl melamine resin

Abstract

This invention discloses a compound used for dope cross-linking agent: six methoxyl group methyl melamine. It solves puzzle of no way to synthesize high substituted degree methanol etherification melamine. First melamine and over dose formaldehyde under catalysis of manganese peroxide carry out methylolation reaction, gain intermediate product; secondly intermediate product and methanol under catalysis of manganese peroxide carry out etherification reaction, obtain six methoxyl group methyl melamine; this compound is a monomeric compound with six degree of functionality, has low molecular weight, high etherification degree, needle crystal shape. its melting point is 55 deg, possess wonderful stability, comprehensive intermiscibility; And its formaldehyde content is very low, has no injuryto flesh, and is a green product.

Description

technical field

[0001] The invention relates to a production method of a compound used as a crosslinking agent, in particular to a production method of hexamethoxymethylmelamine. Background technique

[0002] Cyanamide resin is a very important class of methanol etherified melamine formaldehyde resin, which developed rapidly during the 1960s. In the United States, this type of resin accounts for a large proportion of melamine resin. Since the mid-1980s in my country, melamine resin has entered a stage of comprehensive development. Among them, butanol-etherified melamine resin has been maturely applied in the coating industry, but methanol-etherified melamine-formaldehyde resin with a high degree of etherification is still in the development stage. Methanol etherified melamine formaldehyde resin with high etherification degree can be used in general industrial coatings such as automotive coatings, coil coatings, can coatings, home appliance coatings, wood coatings, cement and...

Examples

Embodiment Construction

[0008] Such as figure 1 As shown, add melamine and excess paraformaldehyde into the reaction kettle, the molar ratio of paraformaldehyde to melamine should be greater than 10, under normal pressure, the temperature is controlled at 30-35 °C, and the moisture is controlled between 5-15%. During the period, the methylolation reaction is carried out by adding an appropriate amount of manganese dioxide catalyst to generate an intermediate product; after 3 to 4 hours, the methylolation reaction is basically completed, and then an excessive amount of methanol is added, wherein the mole of methanol and the original melamine The ratio should be greater than 8, and the temperature rises to 50-75°C. Also under the action of manganese dioxide catalyst, after about an hour, the etherification reaction is basically completed, and methanol-etherified melamine with a high degree of etherification is produced, namely: hexamethoxymethyl base melamine.

[0009] There is no three wastes generat...

technical field

[0001] The invention relates to a production method of a compound used as a crosslinking agent, in particular to a production method of hexamethoxymethylmelamine. Background technique

[0002] Cyanamide resin is a very important class of methanol etherified melamine formaldehyde resin, which developed rapidly during the 1960s. In the United States, this type of resin accounts for a large proportion of melamine resin. Since the mid-1980s in my country, melamine resin has entered a stage of comprehensive development. Among them, butanol-etherified melamine resin has been maturely applied in the coating industry, but methanol-etherified melamine-formaldehyde resin with a high degree of etherification is still in the development stage. Methanol etherified melamine formaldehyde resin with high etherification degree can be used in general industrial coatings such as automotive coatings, coil coatings, can coatings, home appliance coatings, wood coatings, cement and...

Examples

Embodiment Construction

[0008] Such as figure 1 As shown, add melamine and excess paraformaldehyde into the reaction kettle, the molar ratio of paraformaldehyde to melamine should be greater than 10, under normal pressure, the temperature is controlled at 30-35 °C, and the moisture is controlled between 5-15%. During the period, the methylolation reaction is carried out by adding an appropriate amount of manganese dioxide catalyst to generate an intermediate product; after 3 to 4 hours, the methylolation reaction is basically completed, and then an excessive amount of methanol is added, wherein the mole of methanol and the original melamine The ratio should be greater than 8, and the temperature rises to 50-75°C. Also under the action of manganese dioxide catalyst, after about an hour, the etherification reaction is basically completed, and methanol-etherified melamine with a high degree of etherification is produced, namely: hexamethoxymethyl base melamine.

[0009] There is no three wastes generat...

Images