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
CN112708088BActive Publication Date: 2021-11-12SICHUAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SICHUAN UNIV
Publication Date
2021-11-12

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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