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A kind of melamine resin and its preparation method and application

A melamine and resin technology, applied in the field of melamine resin and its preparation, can solve the problems of reducing formaldehyde content, high cost, and reduced application performance, and achieve the effects of reducing formaldehyde consumption, increasing molecular weight, and low raw material cost

Active Publication Date: 2021-11-12
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The first object of the present invention is to provide a preparation method of melamine resin. The preparation method greatly reduces the formaldehyde content by reducing the amount of formaldehyde in the raw materials and reducing the formation of methylene ether bonds. Excellent water solubility and storage stability solve the problems of high cost and decreased application performance

Method used

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  • A kind of melamine resin and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The preparation method of the melamine resin provided by the present embodiment may further comprise the steps:

[0057] (1) Weigh 50g of melamine and 20g of paraformaldehyde in a three-necked flask, add 100g of water, stir evenly, then raise the temperature to 60°C, and continue stirring for 40min, during which the pH of the system is constantly adjusted to 8 to obtain a methylol monomer solution;

[0058] (2) Take 81g p-aminobenzenesulfonic acid and dissolve it in 120g water, adjust its pH to 6 to obtain a sulfonic acid compound solution, then add the methylol monomer solution dropwise in the sulfonic acid compound solution, and continue stirring 60min, obtain prepolymer solution;

[0059] (3) Weighing 15 g of glycerol triglycidyl ether was added into the prepolymer solution, and the stirring was continued for 120 min to obtain a melamine resin.

Embodiment 2

[0061] The preparation method of the melamine resin provided by the present embodiment may further comprise the steps:

[0062] (1) Weigh 80g of melamine and 55g of formaldehyde solution into a three-necked flask, add 100g of water, stir evenly, then raise the temperature to 65°C, and continue stirring for 60min, during which the pH of the system is constantly adjusted to 8.3 to obtain a methylol monomer solution ;

[0063] (2) Take by weighing 220g sodium p-aminobenzenesulfonate and dissolve it in 230g water, adjust its pH to 5.7 to obtain a sulfonic acid compound solution, then add the methylol monomer solution dropwise in the sulfonic acid compound solution, continue Stir for 45min to obtain a prepolymer solution;

[0064] (3) Weigh 14g of 4-(2,3-epoxypropyloxy)-N,N-bis(2,3-epoxypropyl)aniline into the prepolymer solution, and continue stirring for 160min to obtain Melamine resin.

Embodiment 3

[0066] The preparation method of the melamine resin provided by the present embodiment may further comprise the steps:

[0067] (1) Weigh 120g of melamine and 100g of paraformaldehyde in a three-necked flask, add 100g of water, stir evenly, then raise the temperature to 76°C, and continue stirring for 100min, during which the pH of the system is constantly adjusted to 8.8 to obtain a methylol monomer solution;

[0068] (2) Take 400g sodium p-aminobenzenesulfonate and dissolve it in 450g water, adjust its pH to 5.0 to obtain a sulfonic acid compound solution, then add the methylol monomer solution dropwise in the sulfonic acid compound solution, continue Stir for 30min to obtain a prepolymer solution;

[0069] (3) Take 62g of epoxidized soybean oil and add it into the prepolymer solution, and continue stirring for 180min to obtain a melamine resin.

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Abstract

The invention relates to the technical field of amino resin preparation, in particular to a melamine resin and its preparation method and application. The preparation method of described melamine resin comprises the following steps: (1) mixing and stirring melamine, formaldehyde and water, then raising the temperature, adjusting pH to obtain a methylol monomer solution; (2) mixing the methylol monomer solution Adding the sulfonic acid compound solution and continuing to stir to obtain a prepolymer solution; (3) adding the epoxy compound to the prepolymer solution and continuing to stir to obtain a melamine resin. The preparation method reduces the amount of formaldehyde in raw materials, reduces the formation of methylene ether bonds and other measures, while greatly reducing the formaldehyde content, improves the water solubility and storage stability of the product, and solves the problem of high cost and application performance. issues such as decline.

Description

technical field [0001] The invention relates to the technical field of amino resin preparation, in particular to a melamine resin and its preparation method and application. Background technique [0002] Retanning plays a very important role in leather making. It can not only change the tissue dispersion state of leather collagen fibers and improve the quality of finished leather, but also improve the surface charge of collagen fibers and provide conditions for the penetration and absorption of subsequent materials. In the prior art, amino resin represented by melamine resin is widely used in the retanning process, but the traditional melamine resin often has the problem of excessive free formaldehyde content, which greatly limits its further application. [0003] The free formaldehyde in the melamine resin mainly comes from two aspects. One is that after the reaction is completed, there is still unreacted formaldehyde in the system. This is because the amino compound and fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/42
CPCC08G12/427
Inventor 廖学品周继博孙楠石碧
Owner SICHUAN UNIV
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