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A method for tanning sheepskin with organic amine synergistic epoxy resin composition tanning agent

A technology of epoxy resin and composition, applied in leather impregnation, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc., to achieve structural stability and improve moisture and heat resistance stability Sex, the effect of reducing the tanning time

Active Publication Date: 2022-02-08
CHINA LEATHER & FOOTWEAR IND RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for tanning sheep leather with organic amines and epoxy resin tanning agents in order to solve the existing problems of using epoxy resin tanning agents alone or in combination with other tanning agents to tan the resulting leather

Method used

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  • A method for tanning sheepskin with organic amine synergistic epoxy resin composition tanning agent
  • A method for tanning sheepskin with organic amine synergistic epoxy resin composition tanning agent
  • A method for tanning sheepskin with organic amine synergistic epoxy resin composition tanning agent

Examples

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Embodiment 1

[0044] In this embodiment, the sheepskin after conventional deliming and softening is put into a drum for tanning:

[0045] First, in the melamine bath solution with a liquid ratio of 80% and a concentration of 1.0%, it is treated by turning at 35°C for 60 minutes, then adding an epoxy resin composition tanning agent with a concentration of 10%, turning at 40°C for 1 hour, turning at 50°C for 8 hours, replenishing water, Let it stand overnight, turn it for at least 30 minutes the next day, then control the water and wash it sequentially, use acetic acid solution (acetic acid: water = 1:10 (mass ratio)) to adjust the pH value of the system to 5.5-6.0, then turn it for at least 30 minutes, and take out the drum. Subsequent processing can be carried out as usual.

[0046] Wherein the epoxy resin composition tanning agent used is made up of epoxy resin X and epoxy resin Y with a mass ratio of 5:1, glycerol triglycidyl ether and ethylene glycol diglycidyl ether contained in epoxy r...

Embodiment 2

[0050] In this embodiment, the sheepskin after conventional deliming, softening (degreasing is carried out simultaneously in the softening process, and the pH value is adjusted to 7.5 to 8.0 with baking soda), and pickled is put into a drum for tanning:

[0051] First, in the dicyandiamide bath solution with a liquid ratio of 90% and a concentration of 0.5%, turn it at 40°C for 30 minutes, then add an epoxy resin composition tanning agent with a concentration of 6%, turn it at 38°C for 2 hours, and turn it at 45°C for 10 hours. Replenish the water, let it stand overnight, turn it for at least 30 minutes the next day, then control the water and wash it with water, use formic acid solution (formic acid: water = 1:10 (mass ratio)) to adjust the pH value of the system to 5.5-6.0, turn it for at least 30 minutes, and take out the drum After riding the horse, the subsequent process can be carried out as usual.

[0052] Wherein the epoxy resin composition tanning agent used is to be ...

Embodiment 3

[0056] In this embodiment, the sheepskin after conventional deliming and softening is put into a drum for tanning:

[0057] First, in the amino resin (melamine and formaldehyde polymer, the molar ratio of melamine and formaldehyde is 1:5) bath solution with a liquid ratio of 80% and a concentration of 0.8%, turn it at 30°C for 50 minutes, and then add epoxy resin with a concentration of 12%. Resin composition tanning agent, rotate at 35°C for 1 hour, rotate at 48°C for 10 hours, replenish water, let stand overnight, turn for at least 30 minutes the next day, then control water and wash in turn, use acetic acid solution (acetic acid: water = 1:10 (mass ratio) ) to adjust the pH value of the system to 5.5-6.0, and then rotate for at least 30 minutes, and then proceed to the follow-up process as usual.

[0058] Wherein the epoxy resin composition tanning agent used is made up of epoxy resin X and epoxy resin Y with a mass ratio of 4:1, glycerol triglycidyl ether and ethylene glyc...

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Abstract

The invention discloses a method for tanning sheepskin with an organic amine synergistic epoxy resin composition tanning agent. The softened or acid-removed sheepskin is first treated with an organic amine bath, and then an epoxy resin combination is added. tanning agent. Because the present invention allows the organic amine to penetrate into the leather fiber first, it can cooperate with the epoxy resin tanning agent to react with the amine group of the organic amine and the amine group on the skin collagen fiber at the same time to form a network crosslinked structure, thereby not only improving the leather's durability. Moisture and heat stability, also enable epoxy resin to be used as the main tanning agent to tan sheepskin, improve its tanning performance, and make the tanned sheepskin grain clear, full leather body, white color, excellent yellowing resistance , The storage period of the tanned leather at room temperature is more than 6 months.

Description

technical field [0001] The invention belongs to the technical field of leather tanning technology, and in particular relates to a method for tanning sheepskin with an organic amine in cooperation with a tanning agent of a multi-epoxy epoxy resin composition. Background technique [0002] So far, chrome tanning has been dominant in leather production. The shrinkage temperature of the tanned leather can reach above 100°C, and the comprehensive performance of the finished leather is excellent. However, the trivalent chromium used in tanning can be converted into hexavalent chromium under conditions such as heating or oxidation, while hexavalent chromium is highly toxic and can cause great harm to the ecological environment and human and animal bodies. In recent years, the safety of chrome-tanned leather has been the focus of attention, and the development of chrome-free tanning agents has become a research and development hotspot. [0003] As early as the 1960s, epoxy resin wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08C14C3/22C14C9/04
CPCC14C3/08C14C3/22C14C9/04
Inventor 庞晓燕丁志文刘娜郭松
Owner CHINA LEATHER & FOOTWEAR IND RES INST
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