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Preparation method of retanned intumescent flame retardant

An intumescent flame retardant and catalyst technology, applied in the field of leather flame retardant preparation, can solve the problems of poor plumpness, decreased mechanical properties, and hard leather.

Inactive Publication Date: 2010-07-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When domestic and foreign leather makers need to increase the flame retardant function, they usually choose some flame retardants belonging to the textile, plastic, and rubber industries to apply in the retanning and fatliquoring process. , the mechanical properties are reduced, and in order to meet the requirements of flame retardancy, 20-30% of the tare weight of the flame retardant needs to be added to the leather, which greatly increases the production cost of leather products, so the research has good compatibility with leather. And it is very urgent to add a small amount of flame retardant

Method used

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  • Preparation method of retanned intumescent flame retardant
  • Preparation method of retanned intumescent flame retardant
  • Preparation method of retanned intumescent flame retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: 1) At first, add the sodium methylate of dimethylphosphite quality 6% in dimethylphosphite at 60 ℃, after sodium methylate dissolves completely, add acrylamide, acrylonitrile and maleic anhydride, in React at 60°C for 5 hours to obtain a colorless and transparent liquid A;

[0021] 2) Next, adjust the pH value of the colorless transparent liquid A to 5 with sodium carbonate with a concentration of 8% by mass, then add glyoxal dropwise, react at 60° C. for 0.5 h, and obtain a light yellow liquid B;

[0022] 3) Finally, add melamine to the light yellow liquid B, adjust the pH value to 4, and react at 60°C for 80 minutes to obtain a brownish-red liquid retanning type intumescent flame retardant;

[0023] Among them, the molar ratio of dimethyl phosphite: (acrylamide, acrylonitrile and maleic anhydride): glyoxal: melamine = 1: 1.0: 1.0: 0.1, acrylamide: acrylonitrile: maleic anhydride = 1: 0.6 : a molar ratio of 1.1.

Embodiment 2

[0024] Embodiment 2: 1) At first, add the benzoyl peroxide of dimethyl phosphite mass 7% in dimethyl phosphite at 70 ℃, after benzoyl peroxide dissolves completely, add acrylamide, acrylonitrile React with maleic anhydride at 80°C for 2 hours to obtain a colorless and transparent liquid A;

[0025] 2) Next, adjust the pH value of the colorless transparent liquid A to 7 with sodium hydroxide with a concentration of 12% by mass, then add glyoxal dropwise, react at 50° C. for 1 hour, and obtain a light yellow liquid B;

[0026] 3) Finally, add melamine to the light yellow liquid B, adjust the pH value to 5, and react at 80°C for 30 minutes to obtain a brownish-red liquid retanning type intumescent flame retardant;

[0027] Among them, the molar ratio of dimethyl phosphite: (acrylamide, acrylonitrile and maleic anhydride): glyoxal: melamine = 1: 1.1: 0.8: 0.2, acrylamide: acrylonitrile: maleic anhydride = 1: 0.5 : a molar ratio of 1.2.

Embodiment 3

[0028] Embodiment 3: 1) at first, add the sodium methylate of dimethylphosphite quality 5% in dimethylphosphite at 65 ℃, after sodium methylate dissolves completely, add acrylamide, acrylonitrile and maleic anhydride, in React at 70°C for 3 hours to obtain a colorless transparent liquid A;

[0029] 2) Next, adjust the pH value of the colorless transparent liquid A to 6 with potassium carbonate with a concentration of 15% by mass, then add glyoxal dropwise, react at 40° C. for 2 hours, and obtain a light yellow liquid B;

[0030] 3) Finally, add melamine to the light yellow liquid B, adjust the pH value to 6, and react at 70°C for 40 minutes to obtain a brownish-red liquid retanning type intumescent flame retardant;

[0031] Among them, the molar ratio of dimethyl phosphite: (acrylamide, acrylonitrile and maleic anhydride): glyoxal: melamine = 1: 1.2: 1.1: 0.3, acrylamide: acrylonitrile: maleic anhydride = 1: 0.7 : a molar ratio of 1.3.

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Abstract

The invention discloses a preparation method of a retanned intumescent flame retardant, which comprises the following steps: adding a catalyst into dimethyl phosphite, evenly mixing, adding acrylamide, acrylonitrile and maleic anhydride for reaction, and obtaining colorless transparent liquid A; using alkaline solution for regulating the pH of the transparent liquid A to 5-7, dripping glyoxal, and carrying out reaction for obtaining light yellow liquid B; and adding melamine into the light yellow liquid B for reaction, and obtaining reddish brown retanned intumescent flame retardant C. A product synthesized by the preparation method not only has good flame resistance, which can lead leather to achieve the difficult-flammability by adding 3% of the weight of the leather of the product, but also has good compatibility with the leather, thereby improving the hand feel, the fullness, the softness and the mechanical performances of the leather.

Description

technical field [0001] The invention relates to a preparation method of a leather flame retardant, in particular to a preparation method of a retanning type expansion flame retardant. Background technique [0002] With the popularization of natural leather in car seat cushions, sofas, protective clothing and other fields, fires caused by burning leather are becoming more and more frequent. The large amount of smoke and harmful gas produced by it in the fire will cause people to suffocate and die, because the gas and smoke contain a large amount of SO 2 , HCl, CO, NH 3 , NO 2 Toxic substances such as leather can lead to hypoxia in the fire zone, and people die from hypoxia. Therefore, the research on leather flame retardancy is becoming more and more urgent. [0003] Since the concept of leather fire prevention and flame retardant was put forward late, there is no special flame retardant in the leather industry so far. When domestic and foreign leather makers need to incr...

Claims

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Application Information

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IPC IPC(8): C09K21/12C14C3/08
Inventor 段宝荣王全杰周庆芳
Owner SHAANXI UNIV OF SCI & TECH
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