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Method for carrying out softening treatment on leather

A softening and leather technology, applied in chemical treatment before tanning, chemical treatment of small raw hides/large raw hides/leather hides/furs, small raw hides/large raw hides/leather/fur treatment, etc., which can solve the problem that the length of collagen fibers is difficult to achieve Textile standards, limiting the types and application scope of leather products, collagen fiber strength and length damage, etc., to achieve the effect of expanding types and application scope, easy control, and comfortable touch

Inactive Publication Date: 2014-03-12
邱占伟 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when protease is used to soften the leather, it is based on the decomposition of protein and amino acids in the leather by protease, and it will also decompose the collagen fibers themselves. In this way, due to the decomposition of some proteins in the collagen fibers, thus , so that the strength and length of collagen fibers will be greatly damaged
Therefore, the leather made after softening treatment with protease, when used to make collagen fibers, the length of the obtained collagen fibers is difficult to reach the standard for textiles, and is usually used to produce products such as regenerated leather, which is not suitable for the production of textiles
This also greatly limits the types and scope of application of leather products, and when the leftover materials formed in the process of producing leather products are recycled and reused, the types of products that can be produced are small and the scope of application is small.

Method used

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  • Method for carrying out softening treatment on leather
  • Method for carrying out softening treatment on leather
  • Method for carrying out softening treatment on leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1. Use gray yellow cowhide (back) as leather raw material, and process it in a water drum. The main steps are shown in Table 1-1.

[0054] Table 1-1

[0055]

[0056]

[0057] In the table "T 1 / T 2 " means "turn to T first 1 minute, then let stand for T 2 minutes", "(T 1 / T 2 )×A" means "Turn to T first 1 minute, then let stand for T 2 minutes", and "repeat A times".

[0058] After pretreatment by the method in this example, the spinnable fiber accounts for 79% (mass) of the prepared collagen fiber, the tensile strength is higher than that of silk and wool, the hydrophilicity is good, and the water absorption can reach 630%.

[0059] In this example, the leather raw material gray-yellow cowhide is subjected to a series of pre-treatments to make its state meet the requirements (namely: under a certain water pressure, the water overflows evenly on the buttocks and back of the leather body), and then Softening treatment, in the softening treatment p...

Embodiment 2

[0060] Embodiment 2, using gray buffalo leather (shoulder and back) as the leather material, the main steps are basically the same as in embodiment 1, only different steps are shown, see Table 2-1.

[0061] table 2-1

[0062] main process

Material

temperature / ℃

Mass fraction %

time / min

soften

water

40

100

[0063]

caustic soda

1.7

30 / 30

neutral salt

0.6

15 / 30

water

200

pH8.5-9.5

organophosphate

0.8

30 / 30

Modified Live Bacteria

35

0.065

EM live bacteria

0.055

Nitrifying bacteria

0.06

15 / 90

[0064] After pretreatment by the method in this example, the spinnable fiber accounts for 80% (mass) of the prepared collagen fiber, the tensile strength is higher than that of silk and wool, the hydrophilicity is good, and the water a...

Embodiment 3

[0066] Example 3. Gray yak leather (back) is used as the leather raw material, and the main steps are shown in Table 3-1.

[0067] Table 3-1

[0068]

[0069]

[0070]

[0071] After pretreatment by the method in this example, the spinnable fiber accounts for 78% (mass) of the prepared collagen fiber, the tensile strength is higher than that of silk and wool, the hydrophilicity is good, and the water absorption can reach 606%.

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Abstract

The invention relates to a method for carrying out softening treatment on leather. The method comprises the following step of: carrying out softening treatment on the leather by using liquor containing active bacteria, wherein the active bacteria contain nitrifying bacteria and / or substrate-modifying active bacteria. The main components of the nitrifying bacteria are nitrifying bacteria and denitrifying bacteria; the main components of the substrate-modifying active bacteria are denitrifying bacteria and desulfurizing bacteria. The active bacteria further comprise EM (Effective Microorganism) bacteria. The method disclosed by the invention can keep strength and length of collagen fibers in the leather, and can improve the ratio of the fibers reaching length suitable for spinning in the prepared collagen fibers, so that the treated leather is suitable for collagen fibers for producing and spinning, can expand types and scopes of application of leather products, and especially can expand types and scopes of application of products which can be produced while recycling leftover materials formed in a manufacturing process of the leather products.

Description

technical field [0001] The invention relates to a method for softening leather, which is mainly used for pretreatment of leather producing collagen fibers, so that the softened leather is suitable for producing collagen fibers for textiles. Background technique [0002] In the usual leather production process, a softening step is generally included. At present, the softening treatment of leather is mainly carried out by protease. However, when protease is used to soften the leather, it is based on the decomposition of protein and amino acids in the leather by protease, and it will also decompose the collagen fibers themselves. In this way, due to the decomposition of some proteins in the collagen fibers, thus , so that the strength and length of collagen fibers will be greatly damaged. Therefore, the leather made after softening treatment with protease, when used to make collagen fibers, the length of the obtained collagen fibers is difficult to reach the standard for text...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/08
Inventor 邱占伟席义勋
Owner 邱占伟