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Modified rice dialdehyde starch retanning filler for leather and preparation method of filler

A technology of dialdehyde starch and rice starch, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, application, etc. Tannin penetration, unsatisfactory effect and other problems, to achieve the effect of short preparation cycle, simple process operation and low cost

Inactive Publication Date: 2014-10-08
SHANGYU LANBO NEW MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Exploratory research has been done domestically on the use of dialdehyde starch in the production of wet white leather and its tanning performance. The relative molecular weight of rice starch after dialdehydeization is relatively large and the distribution is single, which affects the penetration of tannins in the skin and cannot be fully combined with Collagen fibers are combined, and the effect of direct application is not ideal, which limits the application of dialdehyde starch in leather processing

Method used

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  • Modified rice dialdehyde starch retanning filler for leather and preparation method of filler
  • Modified rice dialdehyde starch retanning filler for leather and preparation method of filler
  • Modified rice dialdehyde starch retanning filler for leather and preparation method of filler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Mix 29.24g of raw rice starch with 500mL of periodic acid solution with a solubility of 0.5mol / L at room temperature, stir for 5 minutes, adjust the pH value to 3.5 with sulfuric acid, react in a constant temperature water bath at 35°C for 4 hours, and discharge the material. Wash with absolute ethanol and water alternately, and dry at 40°C to obtain rice dialdehyde starch;

[0028] (2) Prepare 65wt% sulfuric acid aqueous solution, take 1.68g as degradation agent;

[0029] (3) Mix 20g of the above-prepared rice dialdehyde starch with 60g of water at room temperature to obtain an emulsion; add the degradation agent aqueous solution obtained in (2) dropwise into the emulsion, stir at 40~50°C for 30min, and obtain the rice dialdehyde starch filler premix;

[0030] (4) Transfer the rice dialdehyde starch filler premix obtained in (3) into a 100mL hydrothermal reaction kettle, the reaction temperature is 100°C, and the reaction time is 2 hours. Soda ash with a mass rat...

Embodiment 2

[0033] (1) Mix 292.43g of raw rice starch with 500mL of periodic acid solution with a solubility of 0.5mol / L at room temperature, stir for 10min, adjust the pH value to 3.5 with sulfuric acid, react in a constant temperature water bath at 35°C for 4h, and discharge. Wash with absolute ethanol and water alternately, and dry at 40°C to obtain rice dialdehyde starch;

[0034] (2) Prepare 80wt% lactic acid aqueous solution and 65wt% sulfuric acid aqueous solution respectively, take 1.20g lactic acid aqueous solution and 1.0g sulfuric acid aqueous solution as mixed acid degradation agent;

[0035] (3) Mix 20g of the above-prepared rice dialdehyde starch with 60g of water at room temperature to obtain an emulsion; add the degradation agent aqueous solution obtained in (2) dropwise into the emulsion, stir at 40~50°C for 30min, and obtain the rice dialdehyde starch filler premix;

[0036] (4) Transfer the rice dialdehyde starch filler premix obtained in (3) into a 100mL hydrothermal ...

Embodiment 3

[0039] (1) Mix 62.66g of raw rice starch with 500mL of sodium periodate solution with a solubility of 0.5mol / L at room temperature, stir for 5 minutes, adjust the pH value to 3.5 with sulfuric acid, react in a constant temperature water bath at 35°C for 4 hours, and discharge , washed alternately with absolute ethanol and water, and dried at 40°C to obtain rice dialdehyde starch;

[0040](2) Prepare 80wt% lactic acid aqueous solution, take 2.0g as degradation agent;

[0041] (3) Mix 20g of the above-prepared rice dialdehyde starch with 60g of water at room temperature to obtain an emulsion; add the degradation agent aqueous solution obtained in (2) dropwise into the emulsion, stir at 40~50°C for 30min, and obtain the rice dialdehyde starch filler premix;

[0042] (4) Transfer the rice dialdehyde starch filler premix obtained in (3) into a 100mL hydrothermal reaction kettle, the reaction temperature is 100°C, and the reaction time is 2 hours. Soda ash with a mass ratio of 20%...

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Abstract

The invention discloses a modified rice dialdehyde starch retanning filler for leather and a preparation method of the filler. The preparation method comprises the following steps: performing dihydroformylation modification and degradation on rice starch, wherein a used dihydroformylation agent is periodic acid or sodium periodate, a used degradation agent is a water solution of enzyme or acid, the relative average molecular weight of the obtained modified rice dialdehyde starch retanning filler is 2000-40000Da, and the aldehyde content is 30%-98%. The modified rice dialdehyde starch retanning filler prepared by adopting the method has good retanning filling capability on the leather; when the filler is applied to the leather, the leather strength can be improved, the leather location difference can be effectively reduced, the leather yield can be increased, the hand feel of the leather is full and soft, and the absorption of grease and dye in a subsequent process cannot be influenced.

Description

technical field [0001] The invention belongs to the technical field of leather chemical industry, in particular to a modified rice dialdehyde starch retanning filler for leather and a preparation method thereof. Background technique [0002] Tanning is the process of converting raw hides and skins into leather, mainly including primary tanning, splitting, shaving and retanning, among which primary tanning converts the dermis of raw hides into wet blue / wet white leathers that are resistant to decay and heat shrinkage , retanning is the further processing of wet blue / wet white leather, adjusting its properties to meet the requirements of leather leather, and endowing leather with some unique sensory properties and performance, which plays a key role in the retanning process The retanning agent can not only further change the charge or state of wet blue / wet white leather, but also has a certain filling effect, so it is also called retanning filler. [0003] As the second large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/08C08B31/18C08B30/12
Inventor 沈晓军兰云军罗卫平廖灿金强伟
Owner SHANGYU LANBO NEW MATERIAL SCI & TECH
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