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Method for preparing retanning-type leather fire retardant

A flame retardant and leather technology, applied in the field of preparation of leather flame retardants, can solve the problems of poor flame retardant effect, large amount of addition, decline in mechanical properties, etc., achieve no harmful smoke, improve flame retardancy, excellent Effect of Flame Retardant Efficiency

Inactive Publication Date: 2010-07-21
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 tanning needs to increase the flame retardant function, some flame retardants (belonging to the textile, plastic, and rubber industries) are usually selected to be applied to the retanning and fatliquoring sections. The adjustment of the first process greatly limits the flexibility and versatility of the process, and the flame retardant effect is not good, it is easy to cause the leather to harden, and the mechanical properties decrease. ~30%, the amount added is too large

Method used

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  • Method for preparing retanning-type leather fire retardant
  • Method for preparing retanning-type leather fire retardant
  • Method for preparing retanning-type leather fire retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: 1) Add sodium methoxide with 8% mass of dimethyl phosphite to dimethyl phosphite at 70°C. After the sodium methoxide is completely dissolved, add acrylamide and react at 80°C for 2 hours to obtain colorless and transparent Liquid A;

[0021] 2) Adjust the pH value of the colorless transparent liquid A to 6.5-7 with sodium carbonate with a mass percent concentration of 10%, then raise the temperature of the reaction system to 80°C, add glutaraldehyde dropwise and react for 4 hours, keeping the pH of the system at 6.5-7 7. Obtain light yellow transparent liquid B;

[0022] 3) Adjust the pH value of the light yellow transparent liquid B to 3-5 with sulfuric acid, add pentaerythritol, and react at 80°C for 1 hour to obtain a brownish yellow oily liquid retanning leather flame retardant;

[0023] Wherein, dimethyl phosphite: acrylamide: glutaraldehyde: polyol = 1: 1.0: 0.5: 0.1.

Embodiment 2

[0024] Example 2: 1) Add 6% benzoyl peroxide by mass of dimethyl phosphite to dimethyl phosphite at 60°C. After benzoyl peroxide is completely dissolved, add acrylamide and react at 50°C for 5 hours , to obtain a colorless transparent liquid A;

[0025] 2) Adjust the pH value of the colorless transparent liquid A to 6.5-7 with sodium hydroxide with a concentration of 5% by mass, then raise the temperature of the reaction system to 90°C, add glutaraldehyde dropwise and react for 3 hours, keeping the pH of the system at 6.5 ~7, to obtain light yellow transparent liquid B;

[0026] 3) Adjust the pH value of the light yellow transparent liquid B to 3-5 with hydrochloric acid, add starch, and react at 70°C for 1.5 hours to obtain a brownish-yellow oily liquid retanning leather flame retardant;

[0027] Wherein, dimethyl phosphite: acrylamide: glutaraldehyde: polyol = 1: 1.1: 0.7: 0.2.

Embodiment 3

[0028] Example 3: 1) Add sodium methoxide with 9% mass of dimethyl phosphite to dimethyl phosphite at 65°C. After the sodium methoxide is completely dissolved, add acrylamide and react at 70°C for 3 hours to obtain colorless and transparent Liquid A;

[0029] 2) Adjust the pH value of the colorless transparent liquid A to 6.5-7 with potassium carbonate with a mass percent concentration of 8%, then raise the temperature of the reaction system to 75°C, add glutaraldehyde dropwise and react for 5 hours, keeping the pH of the system at 6.5-7 7. Obtain light yellow transparent liquid B;

[0030] 3) Adjust the pH value of the light yellow transparent liquid B to 3-5 with sulfuric acid, add pentaerythritol, and react at 90°C for 0.5h to obtain a brownish yellow oily liquid retanning leather flame retardant;

[0031] Wherein, dimethyl phosphite: acrylamide: glutaraldehyde: polyol = 1: 1.2: 0.4: 0.15.

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Abstract

The invention discloses a method for preparing a retanning-type leather fire retardant, comprising the following steps: firstly adding a catalyst in dimethyl phosphite and mixing, and adding acrylamide to react to obtain colorless and transparent liquid A after the catalyst is dissolved; regulating the pH value of the product A to be 6.5-7 by aqueous alkali, boosting the temperature of a reactionsystem to 70-90 DEG C, and dropwise adding glutaraldehyde to react to obtain light yellow transparent liquid B; and regulating the pH value of the product B to be 3-5 by acid, and adding polyol to react to obtain the brown-yellow oily liquid retanning-type fire retardant. The product synthesized by the preparation method of the invention has fire resistance and good retannage, can improve handfeel, fullness and softness and increase mechanical properties for leather; and the fire-retardant level of the leather can be realized by only using the fire retardant the dosage of which is 3% 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 retanned leather flame retardant. Background technique [0002] With the improvement of people's living standards, leather products, as a kind of special daily necessities, are widely used, from the initial wearing to high-end consumption, such as interior decoration, office furniture, transportation (such as airplanes, trains, Automobile) interior decoration and cushions, fire fighting clothing and other fields are closely related to people's lives and property. 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. As we all know, a large amount of smoke and harmful gas produced in a fire can suffocate people, this is due to the large amount of SO contained in the gas and smoke 2 , HCl, CO, NH 3 , NO 2 Toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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