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Complexing agent for leather chrome-free tanning process as well as preparation method and application thereof

A complexing agent and process technology, which is applied in the field of complexing agent and its preparation in the chrome-free tanning process of leather, can solve the problems of poor handle, heavy leather, and low tanning uniformity, and achieve good comprehensive performance and excellent production process. Simplicity and the effect of improving overall performance

Active Publication Date: 2017-02-22
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, zirconium salt has strong hydrolysis, poor permeability, low tanning uniformity, hard tanned leather board, poor hand feeling, heavy finished leather, strong water absorption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A complexing agent used in the chrome-free tanning process of leather disclosed by the invention is characterized in that: it contains a hydrophilic group resistant to strong acid, strong electrolyte and high-concentration metal solution, and the complexing agent is total solid Sulfosuccinic acid monoester salt with a content of 35%, a degree of neutralization of carboxyl groups of 95%, and a degree of sulfonation of 90%;

[0045] The preparation method of the complexing agent that is used for leather chrome-free tanning process, comprises the following steps:

[0046](1) Take by weight 67~100 parts of glycerol, 100 parts of maleic anhydride, and 0.15 parts of catalyst respectively;

[0047] (2) Add glycerin to the reactor, turn on the condensed water and the agitator, adjust the temperature to 65-70°C, add maleic anhydride, control the temperature during the feeding process to not exceed 75°C, put the catalyst in one time, and control the temperature during the adding ...

Embodiment 2

[0079] The specific operation of the synthesis of complexing agent:

[0080] (1) Weigh 100 parts of glycerin, 100 parts of maleic anhydride, and 0.15 parts of p-toluenesulfonic acid in parts by mass.

[0081] (2) Add glycerin into the four-necked bottle, adjust the temperature of the water bath temperature control device to 67°C, turn on the condensed water and the stirrer, slowly add maleic anhydride during the stirring process, and control the temperature during the addition process to not exceed 75°C. The catalyst is put in at one time, and the temperature of the adding process is controlled not to exceed 80°C. After the addition was completed, the temperature was raised to 90-93° C., and the acylation was carried out for 2.5 hours. Afterwards, the temperature is lowered below 45° C., and the material is discharged to obtain a glycerol maleate mixed monoester intermediate with an effective content of 100%.

[0082] (3) Take by weight 100 parts of glycerol maleate mixed mo...

Embodiment 3

[0103] The specific operation of the synthesis of complexing agent:

[0104] (1) Weigh 100 parts of glycerin, 150 parts of maleic anhydride, and 0.15 parts of p-toluenesulfonic acid in parts by mass.

[0105] (2) Add glycerin into the four-necked bottle, adjust the temperature of the water bath temperature control device to 67°C, turn on the condensed water and the stirrer, slowly add maleic anhydride during the stirring process, and control the temperature during the addition process to not exceed 75°C. The catalyst is put in at one time, and the temperature of the adding process is controlled not to exceed 80°C. After the addition was completed, the temperature was raised to 90-93° C., and the acylation was carried out for 2.5 hours. Afterwards, the temperature is lowered below 45° C., and the material is discharged to obtain a glycerol maleate mixed monoester intermediate with an effective content of 100%.

[0106] (3) Take by weight 100 parts of glycerol maleate mixed mo...

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PUM

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Abstract

The invention discloses a complexing agent for a leather chrome-free tanning process as well as a preparation method and application thereof. The complexing agent contains hydrophilic groups resistant to strong acid, strong electrolytes and high-concentration metallic solutions, and is a sulfonated succinate monoester salt of which the total solid content is 35%, the carboxyl neutralization degree is 95%, and the sulfonation degree is 90%. The complexing agent disclosed by the invention can be prepared by virtue of a conventional simple process operation, and is applied to a chrome-free tanning process, the operation process is simple and environment-friendly, the shrinkage temperature of finished product leather reaches 90 DEG C or above, and the comprehensive performance of tanning with the complexing agent is similar to that of chrome tanning.

Description

technical field [0001] The invention relates to the technical field of leather tanning, in particular to a complexing agent used in the chrome-free tanning process of leather and its preparation method and application. Background technique [0002] Tanning is the most important process in the tanning process. [0003] Since Knapp researched and invented the chrome tanning method in 1858, especially since Dennis invented the one-bath chrome tanning method in 1893, because of its simple operation, easy control, and high moisture and heat resistance and stability of the finished leather, it has been widely used in the leather industry. Widely used and dominant. After more than one hundred years of development, the modern tanning industry has formed a complete set of tanning process system based on chrome tanning. However, the chromium utilization rate of the conventional chrome tanning method is only 65%-75%, and a large amount of unabsorbed chromium will be discharged. [0...

Claims

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Application Information

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IPC IPC(8): C14C3/08
CPCC14C3/08
Inventor 兰云军沈晓军许晓红罗卫平柴玉叶
Owner WENZHOU UNIVERSITY