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Method for preparing urea compound modified melamine fibers by base catalysis

A technology of melamine fiber and aldehyde compounds, applied in the direction of fiber chemical characteristics, single-component synthetic polymer rayon, rayon manufacturing, etc., to achieve low reaction temperature, simple and easy thermal curing crosslinking, and fast spinning speed Effect

Active Publication Date: 2020-02-21
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of preparing melamine flame-retardant fiber by wet spinning in the prior art, the present invention proposes a method for preparing urea compound-modified melamine fiber by alkali catalysis, using water-soluble polymer solution, melamine, urea compound and Aldehyde compound under the action of basic catalyst, get urea compound modified melamine fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The method for preparing urea compound modified melamine fiber by alkali catalysis of the present embodiment is as follows:

[0022] Dissolve 1wt% polyvinyl alcohol (PVA) in water, heat and stir, the heating temperature is 30°C, and the stirring time is 2h; add paraformaldehyde, melamine and urea to the dissolved polymer aqueous solution, and add basic catalyst three Adjust the pH value to 7.8 with ethanolamine, keep the temperature at 30°C, and react for 1 hour, during which the solution gradually becomes transparent. Among them, the molar ratio of melamine, urea compound and aldehyde compound (according to the amount of substances containing aldehyde groups) is 1:0.1:1, and the mass ratio of water-soluble polymer to melamine is 1:0.5.

[0023] The obtained melamine resin is wet-spun, and the saturated saturated solution of anhydrous sodium sulfate is used as a coagulation bath, wherein the weight content of boric acid is 0.01%, the temperature of the coagulation bath ...

Embodiment 2

[0026] The method for preparing urea compound modified melamine fiber by alkali catalysis of the present embodiment is as follows:

[0027] Dissolve 20wt% PEG in water, heat and stir, the heating temperature is 95°C, and the stirring time is 8 hours; add formaldehyde, melamine and biuret to the dissolved polymer aqueous solution, and add alkaline catalyst sodium hydroxide to adjust the pH value From 11 to 11, the temperature was kept at 95°C, and the reaction was carried out for 9 hours, during which the solution gradually became transparent. Among them, the molar ratio of melamine, urea compound and aldehyde compound (according to the amount of substances containing aldehyde groups) is 1:2:8, and the mass ratio of water-soluble polymer to melamine is 1:15.

[0028] The obtained melamine resin is wet-spun, and the saturated saturated solution of anhydrous sodium sulfate is used as a coagulation bath, wherein the weight content of boric acid is 5%, the temperature of the coagul...

Embodiment 3

[0031] The method for preparing urea compound modified melamine fiber by alkali catalysis of the present embodiment is as follows:

[0032] Dissolve 15wt% polyvinyl formal in water, heat and stir, the heating temperature is 95°C, and the stirring time is 6h; add glutaraldehyde, melamine and urea to the dissolved polymer aqueous solution, and add a basic catalyst for hydrogenation Adjust the pH value to 10 with calcium, keep the temperature at 85°C, and react for 4 hours, during which the solution gradually becomes transparent. Among them, the molar ratio of melamine, urea compound and aldehyde compound (according to the amount of substances containing aldehyde groups) is 1:0.5:3, and the mass ratio of water-soluble polymer to melamine is 1:12.

[0033] The obtained melamine resin is wet-spun, and the saturated saturated solution of anhydrous sodium sulfate is used as a coagulation bath, wherein the weight content of boric acid is 0.5%, the temperature of the coagulation bath i...

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Abstract

The invention discloses a method for preparing urea compound modified melamine fibers by base catalysis, which comprises the steps: dissolving a water-soluble polymer in water; adding melamine, aldehyde compounds and urea compounds, subjecting them to the action of a base catalyst to obtain a modified melamine resin solution, carrying out wet spinning, and carrying out thermal curing to obtain finished melamine fibers. The polymer melamine fibers prepared through modification have the advantages of high nitrogen content, good fire resistance, high limiting oxygen index, resistance to high temperature, high thermal stability, excellent mechanical properties and the like.

Description

technical field [0001] The invention belongs to the field of synthesis and preparation of melamine flame-retardant fibers, and more specifically relates to a synthesis reaction of melamine, aldehyde compounds and urea compounds, and melamine fibers with good performance are prepared by wet spinning. Background technique [0002] Melamine fiber is a new type of flame-retardant fiber. Melamine fiber has good flame retardancy, arc resistance and good physical and mechanical properties. Melamine fiber is good for easy coloring, does not release ammonia gas during long-term use, and has high hardness and less loss of mechanical properties after heating [Yang Dongchang. Fibers prepared by blending modified melamine resin and viscose and their properties Analysis of [D]. 2016.]. Melamine is cheap and has been widely used in some high-temperature fields. However, the disadvantages of high functionality and high crosslinking degree of melamine lead to poor toughness and poor spinna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/10C08G12/38
CPCD01F6/94D01F1/10C08G12/38
Inventor 曹健焦明立杨凯李闪李洁宋梦朱根兴
Owner ZHONGYUAN ENGINEERING COLLEGE
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