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Method for preparing urea compound modified melamine fiber by alkali catalysis

A technology of melamine fiber and aldehyde compound, which is applied in the direction of chemical characteristics of fiber, single-component synthetic polymer rayon, rayon manufacturing, etc., to achieve the effects of excellent spinnability, excellent flame retardant performance, and simplified reaction process

Active Publication Date: 2022-07-15
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 and heat and stir, wherein the heating temperature is 30°C, and the stirring time is 2h; paraformaldehyde, melamine and urea are added to the dissolved polymer aqueous solution, and an alkaline catalyst is added. The pH value of ethanolamine was adjusted to 7.8, the temperature was kept at 30 °C, and the reaction was carried out for 1 h, during which time the solution gradually became transparent. The molar ratio of melamine, urea compounds, and aldehyde compounds (calculated by 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 subjected to wet spinning, and the saturated saturated solution of anhydrous sodium sulfate is used as a coagulation bath, wherein the weight content...

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 and heat and stir, wherein the heating temperature is 95°C, and the stirring time is 8h; add formaldehyde, melamine and biuret to the dissolved polymer aqueous solution, and add alkaline catalyst sodium hydroxide to adjust the pH value To 11, the temperature was kept at 95 °C, and the reaction was carried out for 9 h, during which the solution gradually became transparent. The molar ratio of melamine, urea compounds, and aldehyde compounds (calculated by 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 subjected to wet spinning, 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 coagulation bath temp...

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 and heat and stir, wherein the heating temperature is 95°C, and the stirring time is 6h; glutaraldehyde, melamine and urea are added to the dissolved polymer aqueous solution, and an alkaline catalyst is added to oxidize The pH value was adjusted to 10 with calcium, the temperature was kept at 85°C, and the reaction was carried out for 4 h, during which the solution gradually became transparent. The molar ratio of melamine, urea compounds, and aldehyde compounds (calculated by 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 subjected to wet spinning, and the saturated saturated solution of anhydrous sodium sulfate is used as a coagulation bath, wherein the weight content of boric...

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Abstract

The invention discloses a method for preparing melamine fiber modified by urea compound by alkali catalysis, which comprises the following steps: dissolving a water-soluble polymer in water; adding melamine, aldehyde compound and urea compound under the action of an alkaline catalyst , to obtain a resin solution of modified melamine, wet spinning, and thermal curing to obtain the final melamine fiber. The polymer melamine fiber prepared by the modification has the characteristics of high nitrogen content, good fire resistance, high limiting oxygen index, high temperature resistance, 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 particularly, relates to a synthesis reaction of melamine, aldehyde compounds and urea compounds, and prepares melamine fibers with good performance 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 easy to color, does not release ammonia gas during long-term use, has high hardness, and has less loss of mechanical properties after heating [Yang Dongchang. Fiber and its properties after blending modified melamine resin and viscose 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 cross-linking degree of melamine lead to poor toughness and poor spinnability of melamine ...

Claims

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Application Information

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Patent Type & Authority Patents(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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