Stearic acid alkylolamide for leather fat-liquoring agent intermediate and method for preparing stearic acid alkylolamide

A technology of fatty acid alkyl alcohol amide and hydroxystearic acid diethanolamide, which is applied in the directions of leather impregnation, small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, etc. It can solve the problems of esters affecting performance, high iodine value, and limited application scope, and achieve the effect of strong light resistance and good affinity.

Active Publication Date: 2015-08-19
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of alkanolamide contains carbon-carbon double bonds in the long chain, which is easy to be oxidized and has a high iodine value. The fatliquor prepared by this method has poor light resistance and is not suitable for light-colored leather, which limits its application. scope
If ordinary saturated long-chain fatty acids are used to synthesize alkyl alcohol amides, although the light resistance is better, some esters will be formed to affect its performance; in addition, unreacted fatty acids have the potential danger of forming oily frost after fatliquoring the leather

Method used

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  • Stearic acid alkylolamide for leather fat-liquoring agent intermediate and method for preparing stearic acid alkylolamide
  • Stearic acid alkylolamide for leather fat-liquoring agent intermediate and method for preparing stearic acid alkylolamide

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Experimental program
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Effect test

Embodiment 1

[0031] 1) Weigh 100 parts of 12-hydroxystearic acid, 30 parts of diethanolamine and 2.5 parts of sodium ethoxide ethanol solution with a mass concentration of 20% in parts by mass;

[0032] 2) Add 12-hydroxystearic acid into a four-necked flask, adjust the temperature of the oil bath temperature control device so that 12-hydroxystearic acid is in a molten state at 80~95°C, then add diethanolamine and raise the temperature to 135°C. Pressure distillation reaction for 4 hours; then lower the temperature to 70°C, add sodium ethoxide ethanol solution with a mass concentration of 20%, and stir for 3 hours. The temperature is lowered to 55°C, and the fatty acid alkanolamide, which is an intermediate of the fatliquoring agent, is discharged; the appearance is beige paste at room temperature, and the purity is above 90%.

Embodiment 2

[0034] 1) According to the number of parts by mass, take 100 parts of 12-hydroxystearic acid, 30 parts of diethanolamine and 3 parts of sodium ethoxide ethanol solution with a mass concentration of 20%;

[0035] 2) Add 12-hydroxystearic acid into a four-necked flask, adjust the temperature of the oil bath temperature control device so that 12-hydroxystearic acid is in a molten state at 80~95°C, then add diethanolamine and raise the temperature to 135°C. Pressure distillation reaction for 4 hours; then lower the temperature to 70°C, add sodium ethoxide ethanol solution with a mass concentration of 20%, and stir for 2.5 hours. The temperature is lowered to 55°C, and the fatty acid alkanolamide, which is an intermediate of the fatliquoring agent, is discharged; the appearance is beige paste at room temperature, and the purity is above 90%.

Embodiment 3

[0037] 1) In parts by mass, 100 parts of 12-hydroxystearic acid, 40 parts of diethanolamine and 5 parts of sodium ethoxide ethanol solution with a mass concentration of 18% were respectively taken;

[0038] 2) Add 12-hydroxystearic acid into a four-necked flask, adjust the temperature of the oil bath temperature control device so that 12-hydroxystearic acid is in a molten state at 80~95°C, then add diethanolamine and raise the temperature to 145°C. Pressure distillation reaction for 3 hours; then lower the temperature to 90°C, add sodium ethoxide ethanol solution with a mass concentration of 18%, and stir for 3 hours. The temperature is lowered to 55°C, and the fatty acid alkanolamide, which is an intermediate of the fatliquoring agent, is discharged; the appearance is beige paste at room temperature, and the purity is above 90%.

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Abstract

The invention discloses stearic acid alkylolamide for leather fat-liquoring agent intermediate and a method for preparing stearic acid alkylolamide. The stearic acid alkylolamide is obtained from the following steps: 12-hydroxystearic acid of which molecules contain hydroxy and carboxyl is adopted as a starting material; 12-hydroxystearic acid and diethanol amine are subjected to acylation reaction firstly; then by-product is subjected to aminolysis reaction under the catalyst condition, and the like. Stearic acid alkylolamide prepared according to the method is high in purity, and the appearance is beige cream; the molecule contains three active hydroxy groups, and the reaction activity is high; the saturation is high, and lightfastness is high.

Description

technical field [0001] The invention belongs to the technical field of leather chemical industry, in particular to a stearic acid alkyl alcohol amide used as a leather fatliquoring agent intermediate and a preparation method thereof. Background technique [0002] From the raw hide to the finished leather product, a series of processing procedures have gone through, among which the fatliquoring process is one of the key processes in the tanning process, which not only determines the softness, fullness and elasticity of the finished leather, but also affects the physical and mechanical properties of the finished leather, Hygienic properties such as hand feeling, water absorption, water vapor permeability and air permeability, and have a great impact on physical and mechanical properties such as tensile strength and elongation of leather. In recent years, fatliquoring agents have developed towards functionalization to meet people's increasingly higher requirements for leather p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C9/02
CPCC14C9/02
Inventor 兰云军张萍沈晓军罗卫平
Owner WENZHOU UNIVERSITY
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