Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of clean tanning method of animal skin based on epoxy compound

An epoxy compound, animal skin technology, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, tanning treatment, etc. Chromium pollution, low shrinkage temperature of tanned leather, slow reaction rate, etc., to achieve efficient tanning, avoid use and discharge, and promote the effect of reaction

Active Publication Date: 2020-05-19
SICHUAN UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of clean tanning method based on epoxy compound for the deficiencies in the prior art, to solve the neutral salt and chromium pollution in the leather tanning process, and the existing epoxy compound tanning method in aqueous medium The reaction rate is slow, the cross-linking rate is not high, and the shrinkage temperature of tanned leather is low.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of clean tanning method of animal skin based on epoxy compound
  • A kind of clean tanning method of animal skin based on epoxy compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Tanning of goat leather

[0026]Sheep raw hides are tanned after tanning in water, dehairing, liming, deliming, softening, washing and other tanning processes according to the conventional process. Soften 100kg of bare leather (weight of gray leather), add 100kg of water, adjust the temperature to 25°C, add an appropriate amount of acid, such as a 1:10 diluted formic acid solution, turn it on for 60 minutes, and adjust the pH of the bath solution to stabilize at 6.5-7.0 , add 5 kg of polyoxyethylene diepoxy ether agent with a molecular weight of about 300, and rotate for 120 minutes. After the tanning agent has completely penetrated into the skin, add 0.4 kg of hexamethylenetetramine, rotate for 60 minutes, and then Add an appropriate amount of sodium carbonate solution (10 times dissolved in water) in 2-4 times, each interval is 30 minutes, adjust the pH of the bath solution to stabilize at 8.9-9.1, then add 100kg of hot water at 50°C, and heat up to 40°C, c...

Embodiment 2

[0027] Embodiment 2: the tanning of bovine leather

[0028] Cowhide raw hides are tanned after undergoing tanning processes such as soaking, dehairing, liming, deliming, softening, and washing according to conventional processes. Soften 100kg of bare hide (weight of gray leather), add 50kg of water, adjust the temperature to 20°C, add an appropriate amount of acid, such as a 1:10 diluted non-expandable aromatic sulfonic acid solution, and turn it for 90 minutes to adjust the pH of the bath After stabilizing at 6.5-7.0, add 0.2kg of hexamethylenetetramine, turn for 60 minutes, add 7.5kg of polyoxyethylene diepoxy ether tanning agent with a molecular weight of about 200, turn for 180 minutes, until the tanning agent is completely After penetrating into the skin, add 0.5kg of hexamethylenetetramine, turn it for 60 minutes, and then add an appropriate amount of sodium carbonate solution (10 times dissolved in water) in 3-5 times, with an interval of 30 minutes each time, adjust th...

Embodiment 3

[0029] Embodiment 3: the tanning of sheep fur

[0030] The raw sheep skins used in fur production are tanned after being soaked in water, degreased and softened according to the conventional process. Put 100kg of fur degreased or softened by neutral enzymes into the trough, add 500kg of water, adjust the temperature to 30°C, add an appropriate amount of acid, such as a 1:10 diluted non-expandable aromatic sulfonic acid solution, and turn for 90 minutes. After adjusting the pH of the bath liquid to stabilize at 6.5-7.0, add 10 kg of polyoxyethylene diepoxy ether tanning agent with a molecular weight of about 600, and rotate for 240 minutes. After the tanning agent has completely penetrated into the skin, add 0.8 kg of Hexamethylenetetramine, rotate for 120 minutes, then add an appropriate amount of sodium carbonate solution (10 times dissolved in water) in 3-5 times, each interval is 30 minutes, adjust the pH of the bath solution to stabilize at 8.5-9.0, and continue to rotate ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
temperatureaaaaaaaaaa
Login to View More

Abstract

The invention discloses an epoxy compound based tanning method for animal skin cleaning. The epoxy compound based tanning method for animal skin cleaning has the characteristics that the water solubility is good, the molecular chain length is adjustable and polyoxyethylene diepoxy ether compounds containing double-ended epoxy groups are used as a tanning agent; at the preliminary stage, the tanning agent is processed in the neutral condition, acid pickling operation is avoided, the using and discharging of neutral salt are avoided; through the methods of adding a catalyst and increasing pH value and temperature in the later stage, the reaction of epoxy groups with collagen molecules and the formation of crosslink bonds are promoted. Through the technical scheme, the tanning effect of an epoxy tanning agent is improved and clean and high-efficient tanning is realized. The epoxy compound based tanning method is suitable for the tanning of the process of different kind of animals skins made by leathers and furs, soft and white leathers with the shrinkage temperature close to 85 DEG C are obtained, and the whole sensory property is similar to glutaric dialdehyde tanning, so that the requirement of leathers non-chromium tanning is met.

Description

technical field [0001] The invention relates to a leather tanning technology, in particular to a tanning method using a diepoxy compound as a tanning agent without using neutral salts, aldehydes, chromium and the like, and belongs to the technical field of leather clean production. . Background technique [0002] Tanning is a very important process in leathermaking. Due to reasons such as traditional habits, production costs, leather performance and leather diversity, chrome tanning is currently the most important tanning method. The traditional chrome tanning method adopts the pickling-chrome tanning process. In the pickling process, in order to prevent the soreness of the skin, more than 7% of salt is usually used, resulting in the chloride ion content in the waste liquid as high as 30,000mg / L. Due to the incomplete utilization of chrome during the chrome tanning process, the chromium content in the waste liquid after chrome tanning greatly exceeds the national standard, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/22
CPCC14C3/22
Inventor 彭必雨贾欣驹张春晓虞德胜
Owner SICHUAN UNIV