Method for superhydrophobic modification of substance containing collagen fibers, method for making leather without tanning agent, and leather products

A technology of superhydrophobic modification and skin collagen, which is applied in the field of tanning, which can solve the problems of chrome tanning agent pollution, unstable performance, and poor durability of tanning effects, and achieve increased shrinkage temperature and denaturation temperature, excellent mechanical properties, and excellent tanning effect of effect

Active Publication Date: 2022-05-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the drying process of collagen fibers after absorbing water and moisture, the strong cohesive force between water molecules causes the fibers to gather and shrink, resulting in serious damage to the multi-level structure of the fiber network material.
[0005] However, due to the pollution and other problems of chrome tanning agents, if the tanning effect can be achieved without tanning agents and the performance of the finished leather can be guaranteed, the development of leather products will be greatly promoted
However, in the existing methods of tanning without tanning agents, the tanning effect is poor in durability, or the process is complicated and the performance is unstable, especially when it meets water, it is easy to return to the state of raw hide, which limits its practical use.

Method used

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  • Method for superhydrophobic modification of substance containing collagen fibers, method for making leather without tanning agent, and leather products
  • Method for superhydrophobic modification of substance containing collagen fibers, method for making leather without tanning agent, and leather products
  • Method for superhydrophobic modification of substance containing collagen fibers, method for making leather without tanning agent, and leather products

Examples

Experimental program
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Effect test

Embodiment 1

[0092] The present embodiment provides the superhydrophobic modification method of the material containing skin collagen fiber, comprises the following steps:

[0093] (1) Soak the skin collagen fiber raw material in water for more than 12 hours to ensure full penetration, then add 10wt% acetic acid aqueous solution and / or 10wt% sodium bicarbonate aqueous solution to the water to adjust the pH to 6.5, and then filter the excess water. The skin collagen fibers were soaked and stirred in absolute ethanol, repeated 4 times, soaked for 2 hours each time, and then vacuum filtered to obtain skin collagen fibers with a water content of about 16.3%.

[0094] (2) Take 10 g of skin collagen fibers treated in step (1), immerse them in 100 mL of isopropanol solution containing 3 g of perfluorodecyltriethoxysilane, soak and stir at 25°C for 24 hours, and then remove by suction filtration The excess liquid was dried at 120°C for 4 hours.

[0095] (3) Wash the skin collagen fibers obtained ...

Embodiment 2

[0099] The present embodiment provides the superhydrophobic modification method of the material containing skin collagen fiber, comprises the following steps:

[0100] (1) Soak the skin collagen fiber raw material in water for more than 12 hours to ensure full penetration, then add 10wt% acetic acid aqueous solution and / or 10wt% sodium bicarbonate aqueous solution to the water to adjust the pH to 6.5, and then filter the excess water. The material containing skin collagen fibers was soaked in absolute ethanol and stirred, and repeated 4 times, soaking for 2 hours each time, and then vacuum filtered to obtain skin collagen fibers with a water content of about 16.3%.

[0101] (2) Take 10 g of skin collagen fibers treated in step (1), immerse them in 100 mL of isopropanol solution containing 1 g of octadecyltrimethoxysilane, soak and stir at 30°C for 12 hours, and then remove excess by suction filtration. Liquid, dry at 105°C for 4h.

[0102] (3) Wash the skin collagen fibers ob...

Embodiment 3

[0104] The present embodiment provides the superhydrophobic modification method of the material containing skin collagen fiber, comprises the following steps:

[0105] (1) Soak the skin collagen fiber raw material in water for more than 12 hours to ensure full penetration, then add 10wt% acetic acid aqueous solution and / or 10wt% sodium bicarbonate aqueous solution to the water to adjust the pH to 6.5, and then filter the excess water. The material containing skin collagen fibers was soaked in absolute ethanol and stirred, and repeated 4 times, soaking for 2 hours each time, and then vacuum filtered to obtain skin collagen fibers with a water content of about 16.3%.

[0106] (2) Take 12 g of skin collagen fibers treated in step (1), immerse them in 100 mL of isopropanol solution containing 2 g of hexadecyltrimethoxysilane, soak and stir for 7 hours at 35 ° C, and remove excess by suction filtration. Liquid, dry at 120°C for 4h.

[0107] (3) Wash the skin collagen fiber obtaine...

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Abstract

The invention relates to the technical field of leather making, in particular to a method for superhydrophobic modification of a substance containing leather collagen fibers, a method for making leather without a tanning agent, and a leather product. The substance containing skin collagen fibers with a water content of 5% to 20% is immersed in a liquid containing a long-chain silane coupling agent, and then treated at a high temperature of 80 to 160°C; then washed and dried; the substance containing skin collagen fibers Contains powdered leather collagen fibers and / or pickled-de-pickled bare hides obtained through conventional tanning processes; long-chain silane coupling agent is C n Y 2n+1 (CH 2 ) m SiX 3 ; The mass ratio of the substance containing skin collagen fibers to the long-chain silane coupling agent is 1: (0.02-0.6). The skin collagen fibers treated by the present invention have stable superhydrophobic properties in a wide pH range, the water tentacles are higher than 150°, and the water absorption rate is lower than 0.8g·g ‑1 , and still maintain a complete multi-scale network structure after water treatment.

Description

technical field [0001] The invention relates to the technical field of leather making, in particular to a method for superhydrophobic modification of a substance containing leather collagen fibers, a method for making leather without a tanning agent, and a leather product. Background technique [0002] It has been thousands of years to make raw hide into leather, and then process it into leather products with different styles. However, the research history of leather tanning mechanism is relatively short, and there is still a lack of sufficient and detailed data. The mainstream view of traditional tanning mechanism research is that a necessary condition for tanning is that when leather is turned into leather, tanning agent molecules must interact with more than two reaction points in the collagen structure to form new crosslinks. However, the comprehensive performance of leather is not positively correlated with the crosslinking strength. Over the past few years, due to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C9/00
CPCC14C9/00
Inventor 徐双凤石碧李双洋黄鑫
Owner SICHUAN UNIV
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