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A kind of preparation method of preparing chrome tanning agent with carboxymethyl cellulose

A technology of carboxymethyl cellulose and chrome tanning agent, applied in the field of leather chemical industry, can solve the problems of low absorption rate of chrome tanning agent, limited storage, high use cost, etc., achieve excellent tanning performance, reduce use cost, and good comprehensive performance Effect

Active Publication Date: 2021-05-04
山东济清科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, red vanadium (potassium dichromate, sodium dichromate), the raw material for producing chrome tanning agents, not only has limited reserves on the earth, but also has a low absorption rate of chrome tanning agents in the traditional chrome tanning method, only 60%~70% % or so, the use cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Weigh 40 parts of carboxymethyl cellulose and swell with 400 parts of water for 2 hours;

[0021] (2) Dissolve 100 parts of potassium dichromate with a mass concentration of 100% in water with a mass of 400 parts to obtain a potassium dichromate solution, and then pour it into an acid-resistant Add (133.3-B) concentrated sulfuric acid with a mass concentration of 100% into the container;

[0022] (3) Slowly add carboxymethyl cellulose swollen with water into the reaction vessel containing potassium dichromate solution and concentrated sulfuric acid solution under stirring, and keep the reaction temperature at 95°C until the reaction is completed, and the solution is blue-green; check The color and alkalinity of the tanning liquor, and adjust the reaction solution; if the color of the tanning liquor is slightly yellowish, carboxymethyl cellulose needs to be added to continue the reaction until there is no yellowish shadow; if the alkalinity is slightly lower, soda as...

Embodiment 2

[0026] (1) Weigh 30 parts of carboxymethyl cellulose and swell with 300 parts of water for 3 hours;

[0027] (2) Dissolve 100 parts of potassium dichromate with a mass concentration of 100% in 500 parts of water to obtain a potassium dichromate solution, and then pour it into an acid-resistant Add (133.3-B) concentrated sulfuric acid with a mass concentration of 100% into the container;

[0028] (3) Slowly add carboxymethyl cellulose swollen with water into the reaction vessel containing potassium dichromate solution and concentrated sulfuric acid solution under stirring, and keep the reaction temperature at 95°C until the reaction is completed, and the solution is blue-green; check The color and alkalinity of the tanning liquor, and adjust the reaction solution; if the color of the tanning liquor is slightly yellowish, carboxymethyl cellulose needs to be added to continue the reaction until there is no yellowish shadow; if the alkalinity is slightly lower, soda ash needs to b...

Embodiment 3

[0032] (1) Weigh 50 parts of carboxymethyl cellulose and swell with 450 parts of water for 5 hours;

[0033] (2) Dissolve 100 parts of potassium dichromate with a mass concentration of 100% in water with a mass of 400 parts to obtain a potassium dichromate solution, and then pour it into an acid-resistant Add (133.3-B) concentrated sulfuric acid with a mass concentration of 100% into the container;

[0034] (3) Slowly add carboxymethyl cellulose swollen with water into the reaction vessel containing potassium dichromate solution and concentrated sulfuric acid solution under stirring, and keep the reaction temperature at 95°C until the reaction is completed, and the solution is blue-green; check The color and alkalinity of the tanning liquor, and adjust the reaction solution; if the color of the tanning liquor is slightly yellowish, carboxymethyl cellulose needs to be added to continue the reaction until there is no yellowish shadow; if the alkalinity is slightly lower, soda as...

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Abstract

The invention relates to a preparation method for preparing chrome tanning agent with carboxymethyl cellulose. The method comprises the following steps: weighing 30-60 parts of carboxymethyl cellulose, adding 7-10 times the weight of water to swell for 2-6 hours; dissolving 100 parts of pure dichromate into 300-600 parts of water, To obtain a dichromate solution, add mineral acid to the acid-resistant container containing the dichromate solution under stirring, and add carboxymethyl cellulose swollen with water under stirring, and keep the reaction temperature at 90-95°C until After the reaction is completed, the solution is blue-green. Check the color and alkalinity of the tanning solution, and adjust the reaction solution until the reaction is completed and meets the requirements. After standing, standing, concentrating, and spray-drying, the chrome tanned product prepared with carboxymethyl cellulose is obtained. agent. The chrome tanning agent prepared with carboxymethyl cellulose can replace glucose and reduce the cost of use; the obtained chrome tanning agent has masking characteristics, excellent leather tanning performance, good abrasion resistance, tensile strength and other comprehensive properties.

Description

technical field [0001] The invention belongs to the field of leather chemical industry, in particular to a preparation method for preparing chrome tanning agent with carboxymethyl cellulose. Background technique [0002] In tanning production, tanning is a process of qualitative change that converts raw hide into leather, and the chemical material that can convert hide into leather is called a tanning agent. The tanning agents that can be used in the tanning process of tanning include inorganic tanning agents and organic tanning agents. Among many tanning agents, the chrome tanning agent among the inorganic tanning agents has strong moisture and heat resistance stability, storage resistance, soft and plump hand feeling, excellent dyeing performance and other properties, and it still has irreplaceable properties. effect. [0003] Chromium in nature mainly exists in the form of hexavalent chromium in potassium dichromate or sodium dichromate. The chrome tanning agent used in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/06C14C3/08C14C3/28
Inventor 孙友昌王立新
Owner 山东济清科技服务有限公司
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