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Leather degreasing agent based on ionic liquid and preparation method thereof

A technology of ionic liquid and degreasing agent, which is applied in the field of leather processing, can solve the problems of oil spots on finished products, large environmental pollution, and easy volatilization of organic solvents, and achieve the effects of improving effect and efficiency, simple preparation method, and easy industrialization

Active Publication Date: 2020-11-17
汤普勒新材料嘉兴有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yet all there is certain defective in these degreasing methods
Emulsification degreasing and alkaline degreasing can remove the grease on the surface of raw hides, but the internal grease removal effect is not good, and further degreasing is required, otherwise the finished product will still have oil spots
The enzymatic degreasing method can effectively remove the oil in the skin, but it has high requirements for temperature and time control. Improper temperature control will easily cause enzyme inactivation and affect production efficiency. In addition, if the enzyme treatment time is too long, it will easily damage the collagen fiber network.
Although the degreasing effect of the organic solvent degreasing method is better, the organic solvent is volatile and causes great environmental pollution.

Method used

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preparation example Construction

[0029] The present invention also provides a kind of preparation method of the leather degreasing agent based on ionic liquid, it comprises the steps:

[0030] S1: Synthesis of ionic liquids:

[0031] S11: Dissolve 1-methylimidazole in ethanol, under the protection of inert gas, mix 1-chlorobutane or 1-

[0032] Add bromobutane dropwise to the above-mentioned ethanol solution of 1-methylimidazole, stir magnetically at 25°C to 35°C for 2 to 10

[0033] Hours, the reaction solution was cooled to 0°C;

[0034] S12: Extract the reaction solution with ethyl acetate, and obtain ionic liquids after drying and removing water

[0035] 1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) and 1-butyl-3-methylimidazolium bromide ([Bmim][Br]);

[0036] S2: Provide non-ionic surfactant, anionic surfactant and water,

[0037] S3: Mix one or more of the ionic liquids prepared in step S1 with the nonionic surfactant, anionic surfactant and water to obtain an ionic liquid-based leather degreas...

Embodiment 1

[0057] Production Method:

[0058] (1) 1-methylimidazole is dissolved in ethanol, under the protection of nitrogen, 1-chlorobutane is added dropwise in the above-mentioned solution, the molar ratio of 1-chlorobutane and 1-methylimidazole is 1.10, Magnetic stirring was performed at 30°C for 5 hours, the reaction solution was cooled to 0°C, extracted with ethyl acetate, and dried to obtain ionic liquid 1-butyl-3-methylimidazolium chloride ([Bmim][Cl]), relative to The yield of 1-methylimidazole was 92%.

[0059] (2) [Bmim] [Cl] is compounded with nonionic surfactant, anionic surfactant and water to prepare degreasing agent, and its specific composition formula is (total amount is calculated in 100 parts): 1-butyl-3- Methylimidazolium chloride ([Bmim]Cl): 5 parts; Pingpingjia O: 10 parts; sodium dodecylbenzenesulfonate (LAS): 15 parts; water: 75 parts, configured into 12.5kg of degreased Liquid, put into the drum and stir for 20min, set the temperature at 30°C, rotate at 20rpm,...

Embodiment 2

[0062] (1) Dissolve 1-methylimidazole in ethanol, under the protection of helium, add 1-bromobutane dropwise to the above solution, the molar ratio of 1-bromobutane to 1-methylimidazole is 1.2 , stirred magnetically at 30°C for 5 hours, cooled the reaction solution to 0°C, extracted with ethyl acetate, and dried to obtain ionic liquid 1-butyl-3-methylimidazolium bromide ([Bmim][Br]), The yield relative to 1-methylimidazole was 95%.

[0063] (2) [Bmim][Br] is compounded with nonionic surfactant, anionic surfactant and water to prepare a degreasing agent, and its specific composition formula is (the total amount is based on 100 parts): 1-butyl-3- Methylimidazolium bromide ([Bmim][Br]) 10 parts; Octylphenol polyoxyethylene ether OP-1: 11 parts, N,N-sodium oleoyl methylsulfonate (pancreatine plus bleach T): 8 parts ;Water: 71 parts, configured according to the proportion to make 10kg of degreasing agent, add it to the drum and stir for 20 minutes, set the temperature at 45°C, and...

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Abstract

The invention relates to a leather degreasing agent based on ionic liquid and a preparation method thereof. The leather degreasing agent is composed of the following components by mass: 5%-20% of an ionic liquid, 5%-17% of a nonionic surfactant, 3%-15% of an anionic surfactant and 60%-85% of water. According to the leather degreasing agent, the dispersion effect of the ionic liquid on collagenousfibers and the excellent solubility of the ionic liquid on grease are utilized, the ionic liquid is adopted as a removal reagent of raw material leather grease; and emulsification, permeation and washing effects of the nonionic surfactant and the anionic surfactant are combined, so that efficient degreasing of raw material leather is achieved. For different raw material leather, the degreasing rate is 70% or above, the degreasing time can be shortened to be within 30 minutes, and the degreasing agent has important practical application value. In addition, the invention further provides a preparation method of the leather degreasing agent based on the ionic liquid.

Description

technical field [0001] The invention relates to the technical field of leather processing, in particular to an ionic liquid-based leather degreasing agent and a preparation method thereof. Background technique [0002] Leather products are favored by people because of their special surface texture, excellent softness and durability. Leather is derived from various animal skins, and its excellent performance comes from the tanning effect of tanning agents on raw hide collagen fibers and subsequent finishing. However, animal skin not only contains collagen fiber network, but also contains a large amount of oil and other lipid substances on its surface and glands. The existence of these substances not only hinders the penetration of various chemical materials in the subsequent processing process, but also Cause defects such as "grease spots" and "metal soap" on the leather surface, thereby affecting the quality of leather products. Therefore, degreasing raw leather is a very ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C5/00C14C1/08
CPCC14C5/00C14C1/08
Inventor 张建维金硕孙治国王永锋
Owner 汤普勒新材料嘉兴有限公司
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