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Auxiliary tanning and dyeing agent, its preparation method and application

A technology of dyeing aids and derivatives, applied in application, dyeing, leather surface treatment, etc., can solve the problems of low water solubility and reactivity of chitosan, improve the filling effect, increase the relative molecular weight, and improve the composition The effect of leather performance

Active Publication Date: 2020-03-13
阳信瑞丰集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong hydrogen bond and other effects inside the chitosan molecule, the water solubility and reactivity of chitosan are low, and modification experiments are needed to improve its reactivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of auxiliary tanning and dyeing agent, comprises steps:

[0024] (1) Weigh deionized water 10 times heavier than carboxymethyl chitosan and add it to the reaction vessel;

[0025] (2) Adjust the reaction temperature in the container to 40°C,

[0026] (3) Add 1.0 mole of carboxymethyl chitosan with an accurately weighed mass concentration according to 100% into the reaction vessel, and start stirring until carboxymethyl chitosan is completely dissolved;

[0027] (4) Add a mixture of accurately weighed 1.0 mole of glycolic acid with a mass concentration of 100% and accurately weighed 0.5 mole of concentrated sulfuric acid with a mass concentration of 100% into the reaction vessel and accelerate Stirring speed, until the addition is complete, then react for 30 minutes;

[0028] (5) Continue to react for 30 minutes at room temperature, take out the product, and obtain the auxiliary tanning and dyeing agent, observe its properties and measure its per...

Embodiment 2

[0030] The preparation method of auxiliary tanning and dyeing agent, comprises steps:

[0031] (1) Weigh deionized water 10 times heavier than carboxymethyl chitosan and add it to the reaction vessel;

[0032] (2) Adjust the reaction temperature in the container to 40°C,

[0033] (3) Add 1.0 mole of carboxymethyl chitosan with an accurately weighed mass concentration according to 100% into the reaction vessel, and start stirring until carboxymethyl chitosan is completely dissolved;

[0034] (4) Add a mixture of accurately weighed 1.0 mole of glycolic acid with a mass concentration of 100% and accurately weighed 0.5 mole of concentrated sulfuric acid with a mass concentration of 100% into the reaction vessel and accelerate Stirring speed, until the addition is complete, then react for 40 minutes;

[0035] (5) Continue to react for 30 minutes at room temperature, take out the product, and obtain the auxiliary tanning and dyeing agent, observe its properties and measure its per...

Embodiment 3

[0037] The preparation method of auxiliary tanning and dyeing agent, comprises steps:

[0038] (1) Weigh deionized water 10 times heavier than carboxymethyl chitosan and add it to the reaction vessel;

[0039] (2) Adjust the reaction temperature in the container to 40°C,

[0040] (3) Add 1.0 mole of carboxymethyl chitosan with an accurately weighed mass concentration according to 100% into the reaction vessel, and start stirring until carboxymethyl chitosan is completely dissolved;

[0041] (4) Add a mixture of accurately weighed 1.0 mole of glycolic acid with a mass concentration of 100% and accurately weighed 0.5 mole of concentrated sulfuric acid with a mass concentration of 100% into the reaction vessel and accelerate Stirring speed, until the addition is complete, then react for 50 minutes;

[0042] (5) Continue to react for 30 minutes at room temperature, take out the product, and obtain the auxiliary tanning and dyeing agent, observe its properties and measure its per...

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Abstract

The invention discloses a tanning and dyeing auxiliary as well as a preparation method and application thereof and belongs to the field of leather chemicals. The tanning and dyeing auxiliary disclosedby the invention is formed by modifying carboxymethyl chitosan or a derivative of the carboxymethyl chitosan by adopting glycollic acid or the derivative of the glycollic acid. According to the preparation method of the tanning and dyeing auxiliary, the glycollic acid and the carboxymethyl chitosan react with each other, so the relative molecular mass of the tanning and dyeing auxiliary is increased , the filling effect of the tanning and dyeing auxiliary is improved, the water solubility of the tanning and dyeing auxiliary is improved and the application range of the tanning and dyeing auxiliary is widened; meanwhile, the molecules contain many groups such as carboxyl and oxhydryl, so the tanning and dyeing auxiliary can be applied to a chrome tanning step; the groups can have coordinatebonding with chrome ions on collagenous fibers so that effective connection of collagen proteins is enhanced, the performances of finished leather are improved, and the quality of the finished leather is improved. The groups such as carboxyl and oxhydryl inside the molecules of the tanning and dyeing auxiliary disclosed by the invention have coordinate bonding with the chrome, so the tanning anddyeing auxiliary can be bonded with the leather, afterwards amino inside the molecules can be bonded with dye molecules, so the colors of the finished leather are increased. Moreover, an obtained product is acidic, so a certain color fixation effect is played.

Description

technical field [0001] The invention relates to the field of leather chemical industry, in particular to an auxiliary tanning and dyeing agent, a preparation method and application thereof. Background technique [0002] In the processing and production process of the leather industry, the requirements for environmental protection are getting higher and higher. At its root, the pollution caused by leather production mainly comes from the chemicals used in the production process. The implementation of clean tanning production technology must be based on the research and development of leather green chemicals. Only by solving the green problem of chemicals in synthesis and application can it be possible to realize the cleanliness of the production process. In the production process, the wastewater discharged from the tanning process and the dyeing process is the main source of tanning wastewater. In addition to increasing the treatment of wastewater, it is also possible to co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C11/00C14C3/06C08B37/08D06P5/08
CPCC08B37/003C14C3/06C14C11/003D06P5/08
Inventor 孙友昌王立新李天铎张泽天
Owner 阳信瑞丰集团有限公司
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