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Method of THP and multi-amino-compounds combining tanning leather

A polyamino compound combined with tanning technology, applied in the field of leather tanning, can solve the problems of poor tanning effect and uneven thickness of leather split layer, and achieve good fatliquoring and dyeing performance, white color and fine grain. Effect

Inactive Publication Date: 2008-05-21
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The tanning effect of using organic phosphonium salt (THP) alone is not very good, the finished leather board is very hard and tight, and a high degree of fatliquoring is needed to increase its softness, and the thickness of the tanned leather is not uniform when split

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: pickling again: at first leather and 23 DEG C of water are added in the drum by the mass ratio of 1:1, then add the salt of 10% leather quality and the pH value of formic acid adjustment solution to be 2.5 and rotate for 60min; : Then add tetrakis hydroxymethyl phosphine chloride (THPC) of leather quality 3%, rotate 4 hours, add the dicyandiamide of leather quality 1.5% again, rotate 2 hours; Raise alkali: add the pH value of sodium bicarbonate adjustment solution 6.3, let it stand overnight, turn it for 30 minutes the next day, and wash it with water.

Embodiment 2

[0013] Embodiment 2: pickling again: at first leather and 21 DEG C of water are added in the drum by the mass ratio of 1:1, then add the salt of 10% of leather quality and the pH value of formic acid adjustment solution to be 2.8 and rotate for 60min; : then add tetrakis hydroxymethyl phosphine sulfate (THPS) of leather quality 2%, rotate 4 hours, add the urea of ​​leather quality 1.0% again, rotate 2 hours; Raise alkali: add the pH value of sodium acetate adjustment solution to be 6.1, static Leave it overnight, turn it for 30 minutes the next day, and wash it with water.

Embodiment 3

[0014] Embodiment 3: pickling again: at first leather and 25 ℃ of water are added in the drum by the mass ratio of 1:1, then add the salt of leather quality 10% and the pH value of formic acid adjustment solution is 3.0 and rotate 60min; : then add tetrakis hydroxymethyl phosphine chloride (THPC) of leather quality 1%, rotate 4 hours, then add the ethylenediamine of leather quality 0.5%, rotate 2 hours; Raise alkali: add the pH value of sodium formate adjustment solution to be 6.5 , let it stand overnight, turn it for 30 minutes the next day, and wash it with water.

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PUM

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Abstract

A method for combing THP and amino compound and tanning leather; leather and water are added into a rotary drum and then salt and formic acid are added for mixing; organophosphorus salt THP is added and then amino compound is added; the pH value of the added alkaline regulating solution is 6.0 to 6.5 and the solution is kept still overnight and washed by water next day in a rotary way. The invention combines the THP and amino compound to ban the leather and in this way, crust leather which is provided with a shrinkage temperature of 83 Celsius degrees; the crust leather is characterized by pure white color, fine grain surface, full leather body and excellent stuffing and dyeing performance. By adopting the combining and banning method, the free formaldehyde content in the crust leather can be effectively reduced to a level which is far lower than the national standard.

Description

technical field [0001] The invention relates to a method for tanning leather, in particular to a method for tanning leather in combination with THPS and polyamino compounds. Background technique [0002] Chrome tanning agent is currently the main tanning agent for tanning, and is favored by the majority of tanners because of its good performance and the development of multiple varieties. However, due to environmental concerns and personal safety, the use of chrome tanning agents has been largely restricted. The first serious problem faced by the traditional pure chrome tanning method is that the reserves of chromium in the earth's crust are small, and the distribution of chrome ore on the earth is also extremely uneven; the second serious problem is the pollution of chrome tanning waste liquid question. Developed countries led by the European Union have also imposed stricter restrictions on the chromium and hexavalent chromium content of imported leather and fur products f...

Claims

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Application Information

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IPC IPC(8): C14C3/08
Inventor 张辉毛李蓉强西怀洪新球孙妍纪春娟
Owner SHAANXI UNIV OF SCI & TECH