Production of butylated amino resin with low methylol melamine

An amino resin and melamine technology, applied in the industrialized environmental protection production field of amino resin, can solve the problems of poor etherification and condensation reaction selectivity, insufficient imino content, and high formaldehyde content, and achieves inhibition of condensation reaction, excellent performance, and promotion of ether effect of chemical reaction

Active Publication Date: 2021-03-23
CHONGQING JIANFENG HAOKANG CHEM
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Problems solved by technology

However, the above method has problems such as high formaldehyde content, poor selectivity of etherification and condensation reactions, insufficient imino content, high cost, and waste discharge.

Method used

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Examples

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with specific examples, but those skilled in the art should understand that the examples described below are only for better understanding and implementation of the present invention, and are not intended to limit the present invention.

[0027] Production of Intermediate Raw Materials of Low Methylol Melamine

[0028] First, formaldehyde and melamine are added to the hydroxylation reactor so that the molar ratio of melamine to formaldehyde is about 1:3 to 4;

[0029] Then add alkali such as sodium hydroxide to adjust the pH value of the reaction solution in the reactor to be between 7 and 8;

[0030] Control the temperature in the reactor to 50°C to 70°C, and react for 2 to 3 hours;

[0031] After the reaction solution is cooled, it is introduced into a centrifuge for centrifugation to obtain a low methylol melamine wet material and mother liquor;

[0032] Mother liquor is returned in the reactor a...

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Abstract

The invention provides butylated amino resin produced by utilizing low-hydroxymethyl melamine. The amino resin is prepared by the following steps: continuously producing the low-hydroxymethyl melamineby utilizing high-concentration formaldehyde; butylating the low-hydroxymethyl melamine and controlling the pH (Potential of Hydrogen) value through acetic acid and ammonium acetate; adding acetylacetone to eliminate surplus formaldehyde; carrying out dealcholization and dehydration treatment. The amino resin produced by the invention has very excellent performance in the aspects of formaldehydecontent, antistatic performance or self-polymerization performance and the like, and has moderate polarity, high yield, moderate cost, good paint film leveling performance, high fullness and good flexibility and is suitable for OEM paint; in a whole production process, zero emission of wastewater can be realized.

Description

technical field [0001] The invention relates to the industrialized environment-friendly production of amino resin. Background technique [0002] Utilize melamine such as hexamethylol melamine or low methylol melamine to synthesize etherified amino resins, you can refer to the applicant’s previous patents or patent applications CN 103739563B, CN 103739803B, CN103709111B, CN105968283A, CN105968281A, CN105968282A and CN106008870A, here also Its entire content is incorporated by reference. In addition, CN103102466A and CN105585684A also disclose the synthesis method of high imino etherified amino resin. However, the above method has problems such as high formaldehyde content, poor selectivity of etherification and condensation reactions, insufficient imino content, high cost, and waste discharge. Contents of the invention [0003] The object of the present invention is to provide a production method of amino resin, which can at least overcome some of the defects mentioned in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/42C08G12/32
CPCC08G12/32C08G12/427
Inventor 李平王文武胡劲松吴常兴周建平
Owner CHONGQING JIANFENG HAOKANG CHEM
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