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Method for preparing modified polysaccharides tanning agent

A sugar tanning agent and polysaccharide technology, which is applied in the field of preparation of modified polysaccharide tanning agents, can solve problems such as uneven distribution, environmental pollution, and high price, and achieve the effect of wide sources and environmental friendliness

Inactive Publication Date: 2008-09-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, my country's chromium resources are short, and the distribution is uneven, the price is expensive, and a large amount of reliance is placed on imports, and the utilization rate of chromium in the tanning process is only 60-70%, and the discharged waste liquid has caused serious pollution to the environment. Chrome tanning agent, to realize the clean production in the process of leather making, is one of the hotspots of research at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 5 kg of cellulose, 2 kg of water, activated with a power of 1000W ultrasonic wave for 5 minutes, filtered, and dried to obtain activated polysaccharides with improved accessibility; 5 kg of the above activated polysaccharides, 2 kg of water, 10 kg of sodium hypochlorite , 1 kg of sulfuric acid, mixed evenly, reacted at a temperature of 30°C for 2 hours, then added 5 kg of sodium hydroxide, stirred evenly, filtered, and washed; added 2 kg of water and 5 kg of periodic acid in the reaction pool, separated by a cationic membrane , through a voltage of 5 volts, a current of 25 mA, an electrical reaction for 2 hours, filtering, washing, and drying to obtain a modified cellulose tanning agent with aldehyde and carboxyl groups.

Embodiment 2

[0029] With 10 kilograms of chitosan, 20 kilograms of water, use the ultrasonic wave activation of 1000W with power for 30 minutes, filter, dry to obtain the activated polysaccharide that accessibility improves; 10 kilograms of above-mentioned activated polysaccharides, 20 kilograms of water, sodium hypochlorite 200 kg, 10 kg of sulfuric acid, mix well, react at 60°C for 6 hours, then add 100 kg of sodium hydroxide, stir evenly, filter and wash; add 20 kg of water and 10 kg of periodic acid in the reaction pool, separate Under the conditions of voltage 10 volts, current 50 milliamperes, electroreaction for 6 hours, filtration, washing, and drying to obtain a modified chitosan tanning agent with aldehyde and carboxyl groups.

Embodiment 3

[0031] 8 kg of starch and 15 kg of water were activated by ultrasonic waves with a power of 1000W for 20 minutes, filtered, and dried to obtain activated polysaccharides with improved accessibility; 8 kg of the above-mentioned activated polysaccharides, 15 kg of water, and 130 kg of sodium hypochlorite were 8 kg of sulfuric acid, mixed evenly, reacted at a temperature of 45°C for 4 hours, then added 60 kg of sodium hydroxide, stirred evenly, filtered, and washed; added 15 kg of water and 8 kg of periodic acid in the reaction pool, separated by a cationic membrane, The modified starch tanning agent with aldehyde group and carboxyl group was obtained by voltage of 8 volts, current of 40 mA, electric reaction for 4 hours, filtration, washing and drying.

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Abstract

The invention discloses a method of preparing a modified polysaccharide tanning agent, and is characterized that polysaccharide which is 5 to 10 parts by weight and water which is 2 to 20 parts by weight are activated for 5 to 30 minutes through ultrasonic the power or which is 1000W, are filtered and dried to obtain activated polysaccharide the accessibility of which is increased; the activated polysaccharide which is 5 to 10 parts by weight, water which is 2 to 20 parts by weight, sodium hypochlorite which is 10 to 200 parts by weight, and sulfuric acid which is 1 to 10 parts by weight are evenly mixed and react for 2 to 6 hours under the temperature ranging from 30 to 60 DEG C; then sodium hydroxide which is 5 to 100 parts by weight is added in, and the mixed solution is evenly stirred, filtered and washed; then water which is 2 to 20 parts and periodic acid which is 5 to 10 parts are added, and an electric reaction is performed for 2 to 6 hours under the separation of a cationic membrane, wherein, the pressure is 5 to 10V, and the current is 25 to 50mA, the mixed solution is filtered, washed, and dried to obtain the modified polysaccharide tanning agent with aldehyde groups and carboxyl groups. In leather pale yellow which is tanned by the modified polysaccharide tanning agent, the grain tightness is smooth, the contraction temperature ranges from 80 to 85 DEG C, and the content of aldehydes in leathers are less than 40mg / kg in accordance with national standards.

Description

technical field [0001] The invention relates to a preparation method of a modified polysaccharide tanning agent, belonging to the field of tanning agent preparation. technical background [0002] Since the appearance of chrome tanning agent in 1884, due to its excellent tanning performance and convenient use, it has been dominant in leather production. It is still a tanning agent widely used in domestic and foreign leather industry. However, my country's chromium resources are short, and the distribution is uneven, the price is expensive, and a large amount of reliance is placed on imports, and the utilization rate of chromium in the tanning process is only 60-70%, and the discharged waste liquid has caused serious pollution to the environment. Chrome tanning agent, to realize the clean production in the process of tanning, is one of the hotspots of research at home and abroad. The real cleaning technology of tanning requires the use of green materials. The main advantages o...

Claims

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Application Information

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IPC IPC(8): C14C3/08
Inventor 单志华甄文娟陈慧李书卿王亚娟
Owner SICHUAN UNIV
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