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The preparation method of continuous quality stable hexamethylolated melamine

A technology of hexamethylolated melamine and stable quality, which is applied in the field of preparation of hexamethylolated melamine, can solve the problems of high free formaldehyde content, unstable quality of hexamethylolated melamine and the like, and achieves methylolated melamine. The effect of high degree, long reaction residence time and stable quality

Active Publication Date: 2021-01-12
JIANGSU CHANGNENG ENERGY SAVING NEW MATERIALS SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that the quality of hexamethylolated melamine with high degree of methylolation prepared in the prior art is not stable and the content of free formaldehyde is high, and a continuous hexamethylolated melamine with stable quality is provided. The preparation method of alkylated melamine

Method used

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  • The preparation method of continuous quality stable hexamethylolated melamine
  • The preparation method of continuous quality stable hexamethylolated melamine
  • The preparation method of continuous quality stable hexamethylolated melamine

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1) Paraformaldehyde and hydrolyzate are polymerized into a formaldehyde aqueous solution with a mass concentration of 30%, and the temperature is raised to 70°C for later use; melamine powder and water are prepared into melamine slurry at a ratio of 1:1 by weight and kept at 25°C for later use; the mass concentration is prepared It is 10% sodium hydroxide solution, pumped into the catalyst tank for standby; the mold temperature controller of the twin-screw extruder is preheated to 60°C;

[0033] 2) Continuously add melamine slurry, 30% formaldehyde solution and 10% sodium hydroxide into a twin-screw extruder to carry out methylolation reaction to obtain material I, wherein the melamine slurry flow rate is 25.7Kg / h, 30 % formaldehyde solution flow rate is 70Kg / h, 10% sodium hydroxide solution flow rate is 0.42Kg / h; twin-screw extruder length-to-diameter ratio is 64:1; twin-screw internal screw element adopts mixing screw element, conveying screw element Combination with ...

Embodiment 2 to Embodiment 4

[0036]Examples 2 to 4 were carried out according to the steps of Example 1. The only difference was that the reaction parameters were different. See Table 2 for details. The product quality detection data of the hexamethylolated melamine prepared in a continuous process with stable quality are as follows: Table 5 shows.

[0037] The reaction parameter of table 2 embodiment 1 to embodiment 4

[0038]

Embodiment 5 to 8

[0040] Embodiments 5 to 8 are carried out according to the steps of Embodiment 1. The only difference is that the reaction parameters are different. See Table 3 for details. The product quality detection data of the hexamethylolmelamine with stable quality prepared in a continuous process are shown in Table 5. .

[0041] The reaction parameter of table 3 embodiment 5 to embodiment 8

[0042]

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Abstract

The invention relates to a preparation method of hexamethylol melamine with stable continuous quality, and mainly solves the problems of unstable quality and high free formaldehyde content of hexamethylol melamine with high hydroxymethylation degree prepared in the prior art. According to the technical scheme, the preparation method of hexamethylol melamine with stable continuous quality comprisesthe following steps: continuously adding melamine, formaldehyde and a catalyst into a double-screw reactor for hydroxymethylation reaction to obtain a material I; then continuously feeding the material I into a vacuum drying machine to be dried and ground into powder to obtain hexamethylol melamine powder II. By means of the preparation method, a good technical effect is achieved, and the methodcan be applied to production and application of hexamethoxymethyl melamine.

Description

technical field [0001] The invention relates to a method for preparing continuous hexamethylolated melamine with stable quality. Background technique [0002] The preparation method of hexamethylolmelamine includes batch method and continuous method. Batch production of hexamethylolmelamine (HMM) is to react melamine and formaldehyde under an alkali metal catalyst, but this method has the following defects: (1) long reaction time (2) unstable product quality (3) product conversion The rate and output are lower than the continuous method. [0003] The continuous production of hexamethylolmelamine (HMM) reported in the prior art is that melamine and formaldehyde are carried out continuously in the presence of a catalyst in a common twin-shaft kneader, and the methylolation reaction is carried out to obtain a water content of 17%. ~42% hexamethylolmelamine paste, yet the hexamethylolmelamine produced by this method has the following defects; (1) free formaldehyde content is h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/32C07D251/64B29C48/40B29C48/505B29C48/625
CPCB29C48/40B29C48/505B29C48/625C07D251/64C08G12/32
Inventor 范勤勇陈玉赵俊飞李少杰朱益林
Owner JIANGSU CHANGNENG ENERGY SAVING NEW MATERIALS SCI & TECH
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