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Method for preparing leather fat-liquoring agent

A technology of leather fatliquor and oil, which is applied in leather impregnation, sulfonate preparation, small hide/big hide/leather/fur treatment, etc. It can solve the problems of many by-products, equipment corrosion, environmental pollution, etc., and reach the human body Low toxicity, weak corrosiveness, avoiding discharge and environmental pollution

Inactive Publication Date: 2012-10-24
成都达威化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The preparation method of the sulfated oil of above-mentioned report uses concentrated sulfuric acid or oleum as sulfating reagent, but, on the one hand concentrated sulfuric acid or oleum all have strong corrosivity, thereby cause serious equipment corrosion; Secondly, in the sulfated oil There are many side reactions in the preparation process, so that there are many by-products; again, in the prior art, excessive concentrated sulfuric acid or oleum is needed as a sulfating agent to form sulfated grease, so a salt washing step is required to remove unreacted oil. Concentrated sulfuric acid or fuming sulfuric acid, and then produce a large amount of acid waste brine, causing pollution to the environment

Method used

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preparation example Construction

[0023] The invention provides a method for preparing a leather fatliquoring agent, comprising the following steps: under the action of a catalyst, sulfation reaction is carried out on oil and sulfamic acid, adding an alkali solution, and neutralizing to obtain a leather fatliquoring agent; The catalyst is one or more of sulfuric acid, phosphoric acid, hypophosphorous acid, urea, amine oxide and thiourea, and the oil is natural oil containing hydroxyl and / or modified oil containing hydroxyl.

[0024] In the above preparation process, natural oils containing hydroxyl groups and / or modified oils containing hydroxyl groups are used as raw materials, sulfamic acid is used as a sulfation agent, and a catalyst is added to catalyze the sulfation reaction, and then the neutralization reaction is carried out with an alkaline solution. And obtain leather fatliquoring agent namely sulfated grease. Since the sulfation reaction is to sulfate the hydroxyl group, that is to say, the sulfamic ...

Embodiment 1

[0038] Add 100g of rapeseed oil into the three-neck flask, raise the temperature to 65~70°C, add 5.5g of methanol, stir for 10min, add 0.5g of catalyst sodium methoxide, and stir evenly. Raise the temperature to 75~80°C, react at this temperature for 2 hours, and the transesterification reaction is completed, then vacuumize at 75~80°C for 30 minutes. Add 16.6 g of sulfamic acid and 5.3 g of urea to the modified rapeseed oil through transesterification, and stir evenly. Raise the temperature to 120~130°C, and react at this temperature for 3h. Cool down to 60°C, slowly add 30g of sodium hydroxide solution with a mass fraction of 10%, adjust the pH value to 6.5~8.5, add 60g of water, stir for 30min, and obtain sulfated oil with a solid content of 60%.

Embodiment 2

[0040] Add 100g of rapeseed oil into the three-neck flask, raise the temperature to 65~70°C, add 5.5g of methanol, stir for 10min, add 0.5g of catalyst sodium methoxide, and stir evenly. Raise the temperature to 75~80°C, react at this temperature for 2 hours, and the transesterification reaction is completed, then vacuumize at 75~80°C for 30 minutes. Add 8.3 g of sulfamic acid and 5.3 g of urea to the modified rapeseed oil through transesterification, and stir evenly. Raise the temperature to 120~130°C, and react at this temperature for 3h. Cool down to 60°C, slowly add 20g of sodium hydroxide solution with a mass fraction of 10% dropwise, adjust the pH value to 6.5~8.5, add 39.4g of water, stir for 30min, and obtain sulfated oil with a solid content of 70%.

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Abstract

The invention discloses a method for preparing a leather fat-liquoring agent. The method employs sulfamic acid as a sulfatizing reagent, and employs one or more of sulfuric acid, phosphoric acid, hypophosphorous acid, urea, amine oxide and thiourea as a catalyst. Grease and the sulfamic acid are subjected to a sulfation reaction and then an alkali solution is added in for a neutralization reaction to get the leather fat-liquoring agent. By using the sulfamic acid as the sulfating reagent, corrosion to equipment and harm to the environment can be reduced because the sulfamic acid has characteristics of non-volatilization, no stink, few human toxicity and weak corrosivity. Occurrence of side reaction during the sulfation reaction can be effectively inhibited by using the catalyst. Moreover, according to the invention, the sulfation reaction can be realized without excessive sulfamic acid, so that salt wash is not needed after the leather fat-liquoring agent is obtained, thereby preventing discharge of acidic waste brine and environment pollution. Experiment results show that the leather fat-liquoring agent has good emulsifying property and can impart good softness and fullness to the leather.

Description

technical field [0001] The invention relates to the technical field of fatliquor, more specifically, to a preparation method of leather fatliquor. Background technique [0002] Fatliquor is the most widely used chemical raw material in tanning production, and it is also one of the important chemical raw materials in the leather processing process. It can not only smooth the leather fiber, prevent the leather from becoming stiff and cracking, but also make the leather tough and strong. Softness, maintain strength, and at the same time have a certain filling effect, making the leather plump and elastic. Therefore, fatliquor is one of the important factors affecting the quality and performance of leather, and plays an important role in leather chemicals. [0003] Sulfated oil is an important anionic fatliquoring agent, which has the characteristics of easy emulsification, strong permeability, complete absorption and good oily feeling. At the same time, it can endow leather with...

Claims

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Application Information

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IPC IPC(8): C07C309/62C07C303/32C14C9/02
Inventor 杨砚宇
Owner 成都达威化工科技有限公司
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