Degradable starch-degradable chromium-containing leather pulp composite as well as preparation method and application thereof

A technology for degrading starch and complexes, applied in application, leather impregnation, small raw hide/large hide/leather/fur treatment, etc., can solve the problems of uneven starch modification, high production cost, poor oxidation selectivity, etc. Excellent effect, rapid reaction, moderate effect of temperature and pressure reaction conditions

Inactive Publication Date: 2015-03-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a degradable starch-degradable chromium-containing dander compound and its preparation method and application in view of the deficiencies in the prior art. It is characterized in that the main raw materials are renewable green resources and tanning waste, which overcomes the need The problem of uneven starch modification, poor oxidation selectivity and high production cost in the process

Method used

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  • Degradable starch-degradable chromium-containing leather pulp composite as well as preparation method and application thereof
  • Degradable starch-degradable chromium-containing leather pulp composite as well as preparation method and application thereof
  • Degradable starch-degradable chromium-containing leather pulp composite as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Add 40 parts of starch, 10 parts of hydrochloric acid with a concentration of 12 mol / L, 10 parts of water, and 3 parts of cerium nitrate into the reaction kettle, mix well, and bake at 80°C for 60 minutes under the protection of nitrogen to obtain light Yellow paste starch degradation product;

[0033] 2) Put 30 parts of dander containing 1.5% chromium trioxide dry weight into the reaction kettle, add 45 parts of water and 2 parts of non-ionic surfactant, stir and degrease at 30°C for 60 minutes, drain water, and add water 30 parts, 10 parts of sodium peroxide, heated up to 90°C for oxidative degradation, and stirred for 90 min to obtain a water-soluble slurry product partially degraded from hexavalent chromium-containing collagen;

[0034] 3) Add 80 parts of the above-mentioned degraded starch, 60 parts of degraded chromium-containing dander, 10 parts of hydrochloric acid with a concentration of 12 mol / L, 80 parts of water, and 20 parts of hydrogen peroxide with a c...

Embodiment 2

[0038] 1) Add 60 parts of starch, 15 parts of hydrochloric acid with a concentration of 12 mol / L, 15 parts of water, and 5 parts of lanthanum nitrate into the reaction kettle. After mixing evenly, bake at 90°C for 90 minutes under the protection of nitrogen to obtain light Yellow paste starch degradation product;

[0039] 2) Put 40 parts of skin flakes containing 2.5% chromium trioxide dry weight into the reaction kettle, add 60 parts of water, 4 parts of non-ionic surfactant, stir and degrease at a temperature of 50°C for 90 minutes, drain water, and add water 40 parts, 15 parts of sodium peroxide, heated up to 110°C for oxidative degradation, and stirred for 120 min to obtain a water-soluble slurry-like product containing part of hexavalent chromium degraded skin collagen;

[0040] 3) Add 100 parts of the above-mentioned degraded starch, 80 parts of degraded chromium-containing dander, 15 parts of hydrochloric acid with a concentration of 12 mol / L, 100 parts of water, and 25...

Embodiment 3

[0044] 1) Add 50 parts of starch, 12 parts of hydrochloric acid with a concentration of 12 mol / L, 12 parts of water, and 4 parts of yttrium nitrate into the reaction kettle. Yellow paste starch degradation product;

[0045] 2) Put 35 parts of dander containing 2.5% chromium trioxide dry weight into the reaction kettle, add 50 parts of water and 3 parts of non-ionic surfactant, stir and degrease at 40°C for 80 minutes, drain water, and add water 35 parts, 12 parts of sodium peroxide, heated up to 100°C for oxidative degradation, stirred for 100 min, and obtained a water-soluble slurry product containing part of hexavalent chromium degraded by skin collagen;

[0046]3) Put 90 parts of the above-mentioned degraded starch, 70 parts of degraded chromium-containing dander, 12 parts of hydrochloric acid with a concentration of 12 mol / L, 90 parts of water, and 22 parts of hydrogen peroxide with a concentration of 28%, and put them into a reactor with a stirrer, at a temperature of 90 ...

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Abstract

The invention discloses a degradable starch-degradable chromium-containing leather pulp composite as well as a preparation method and application thereof. The preparation method is characterized by comprising the following steps of: adding 80-100 parts of degradable starch, 60-80 parts of degradable chromium-containing leather pulp, 10-15 parts of hydrochloric acid with concentration being 12mol / L, 80-100 parts of water and 20-25 parts of 25-30%hydrogen peroxide into a reactor with a stirrer, stirring and reacting for 1-3hours at 85-95 DEG C; cooling the reactants to 50 DEG C, slowly adding 3-5 parts of sodium hydrogen sulfite, stirring and reacting for 1-2hours so that the reaction pulp is completely dissolved in water, and then cooling to 25 DEG C; adjusting the pH value of the reactant pulp to 4.0-5.0 by using a NaOH solution, stirring and reacting for 1-2hours, to finally obtain the degradable starch-degradable chromium-containing leather pulp composite. The problems that in the existing preparation process, starch is not modified uniformly, the oxidization selectivity is poor and production cost is high are solved. After the degradable starch-degradable chromium-containing leather pulp composite is used as leather filler for filling leather, the filled leather is thickened obviously and has high physical mechanical strength, soft and full handfeel, and therefore, the degradable starch-degradable chromium-containing leather pulp composite has excellent filling effect.

Description

technical field [0001] The invention relates to a degraded starch-degraded chromium-containing dander compound, a preparation method and application thereof, and belongs to the field of fine chemicals. Background technique [0002] Starch is a renewable resource synthesized by plants, an inexhaustible and cheap organic raw material, and one of the main raw materials for modern organic and polymer chemicals. The molecular formula of starch is (C 6 h 10 o 5 ) n , is a natural macromolecule formed by connecting many anhydroglucose units through glycosidic bonds. As a polyhydroxy compound, starch is easily oxidized by oxidants, and the hydroxyl groups on its carbon chain are converted into aldehyde groups and carboxyl groups. These aldehyde groups and carboxyl groups have strong affinity with the amino groups and other active groups in the collagen molecule. It has filling function. [0003] Chromium-containing dander is the waste leather scraped from chrome-tanned wet lea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/10C08L89/06C08B31/18C08G81/00C14C9/00
Inventor 单志华杜晓声戴睿陈慧陈治军
Owner SICHUAN UNIV
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