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Plant polyphenol-protein composite leather filler and preparation process thereof

A technology of plant polyphenols and fillers, applied in small raw hides/large raw hides/leather/fur treatment, small raw hides/large raw hides/leather hides/fur chemical treatment, tanning treatment, etc., can solve the problem of poor skin fiber binding force , The physical and mechanical properties of the finished leather are deteriorated, environmental pollution and other problems, and the finished leather is soft and plump, light in color, and good in physical and mechanical properties.

Inactive Publication Date: 2005-02-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the leather filled with a general single protein filler is relatively soft, plump and fine-grained, it has poor binding force with the leather fiber and will also deteriorate the physical and mechanical properties of the finished leather.
In order to improve its binding force with leather fibers, it is usually modified with acrylic resin, aldehydes, metal salts, etc. (Huang Chengxue, Liu Xiankui. Research on the production of protein retanning fillers for leather using chrome tanned waste leather scraps. China Leather. 1991, 20(9): 27~29; Chen Wuyong et al. Chemical modification of hydrolyzed protein. Journal of Sichuan University (Engineering Science Edition). 2002, 34(6): 1~8; Mucka, Kophy J, Matyasovsky J .Symposium of the IULTCS centennial congress, 1997, 427~432), and the modified products of these hydrolyzed proteins are easy to cause environmental pollution in the process of preparation and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 300 parts of water into the reaction kettle with agitator and condenser, and adjust the pH value of the bath solution to 9.8 with an appropriate amount of sodium hydroxide aqueous solution; then add 100 parts of commercially available hydrolyzed protein into the reaction kettle to make it After fully dissolving, add 50 parts of bayberry extract, stir and mix evenly; control the reaction temperature at 18°C, and react for 1.5 hours to obtain a liquid product of plant polyphenol-protein composite leather filler, and then spray dry to obtain a solid powder product . The product has a pH value of 9.2, a hydrolyzed protein content of 59% by weight, and a tannin content of 21% by weight.

Embodiment 2

[0025] Add 300 parts of water into the reaction kettle with agitator and condenser, and adjust the pH value of the bath solution to 10.4 with an appropriate amount of sodium hydroxide aqueous solution; then add 100 parts of hydrolyzed protein extracted from raw hides into the reaction kettle , after fully dissolving it, add 55 parts of thick bark extract, stir and mix evenly; control the reaction temperature at 22°C, and react for 1.0 hour to obtain a liquid product of plant polyphenol-protein composite leather filler, which is then spray-dried Obtain solid powder product. The product has a pH value of 8.1, a hydrolyzed protein content of 55% by weight, and a tannin content of 26% by weight.

Embodiment 3

[0027] Add 300 parts of water into the reaction kettle with agitator and condenser, and adjust the pH value of the bath solution to 10.8 with an appropriate amount of potassium hydroxide aqueous solution; then add 100 parts of protein-containing waste from the tanning industry Add the extracted hydrolyzed protein into the reaction kettle to fully dissolve it, then add 70 parts of larch extract, stir and mix evenly; control the reaction temperature at 25°C, and react for 50 minutes to obtain the plant polyphenol-protein composite leather filling A liquid product, and then spray-dried to obtain a solid powder product. The product has a pH value of 10.0, a hydrolyzed protein content of 50% by weight, and a tannin content of 40% by weight.

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PUM

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Abstract

The present invention provides a plant polyphenol-protein composite leather filler, and is characterized by that it simultaneously contains tannin and protein hydrolysate and its pH value is greater than 7. It is made up by using natural tannin extract and protein hydrolysate as raw material at normal temp. under the alkaline condition by utilizing method provided by said invention. Said filler can make leather soft and full, make its granular surface flat and fine, and can make the leather have large thickening rate and good physical mechanical property.

Description

1. Technical field [0001] The invention belongs to the technical field of leather chemical industry, and in particular relates to a plant polyphenol-protein composite leather filler and a preparation method thereof. 2. Background technology [0002] Filling is an important process in tanning production. Its purpose is to increase the thickness of the leather, improve the firmness and fullness of the belly of the leather side, and improve its loose surface. [0003] Tannin is a natural tanning agent commonly used in tanning. It is mainly used for tanning of bottom leather, belt leather, luggage leather and retanning of shoe upper leather. The main component of it is plant polyphenols, which is also known as It is vegetable tannin, referred to as tannin, and its content accounts for about 70%. Since synthetic materials have replaced most of the bottom leather and belt leather made of tannin extract, the application of tannin extract as a tanning agent has been greatly reduced...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08
Inventor 陈武勇林亮辜海彬
Owner SICHUAN UNIV