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Amphiprotic leather tanning agent and preparation method thereof

A retanning agent and leather technology, which is applied in the field of amphoteric leather retanning agent and its preparation, can solve the problems of leather retanning and insufficient dyeing performance, and achieve the improvement of too high glass transition temperature, increase the degree of branching, and reduce the chromium solution pollution effect

Inactive Publication Date: 2015-01-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Existing products have insufficient performance in leather retanning and dyeing

Method used

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  • Amphiprotic leather tanning agent and preparation method thereof
  • Amphiprotic leather tanning agent and preparation method thereof
  • Amphiprotic leather tanning agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of an amphoteric leather retanning agent, comprising the following steps:

[0037] In terms of parts by mass, add 202 parts of SMA copolymer, 75 parts of N,N-dimethylmethanolamine and 1.385 parts of p-toluenesulfonic acid to the reactor equipped with a condensing device, and add solvent twice the total amount of reactants 554 parts of dioxane, react at 85°C for 3 hours, measure the hydroxyl value in the reaction system, calculated as solids, when the hydroxyl value is less than or equal to 10 (mgKOH / g), add 126 parts of dimethyl sulfate, at 85°C Reaction at low temperature for 3.5h, then vacuum distillation at 0.08Mpa and 80°C for 1h to remove dioxane, finally adjust the pH to 7.0 with 10% NaOH aqueous solution, and adjust the moisture content so that the active ingredient of the product is 30% That's it.

[0038] The physical properties of the amphoteric leather retanning agent prepared in this example: Appearance, colorless or slightly light yell...

Embodiment 2

[0040] A preparation method of an amphoteric leather retanning agent, comprising the following steps:

[0041] In terms of parts by mass, add 202 parts of SMA copolymer, 89 parts of N,N-dimethylethanolamine and 1.455 parts of p-toluenesulfonic acid to the reactor equipped with a condensing device, and add solvent D 582 parts of ketone, react at 90°C for 2.5h, measure the hydroxyl value in the reaction system, calculated as solid, when the hydroxyl value is less than or equal to 10 (mgKOH / g), add 126 parts of dimethyl sulfate, under the condition of 90°C React for 3 hours, then distill under reduced pressure at 0.08Mpa and 80°C for 1 hour to remove butanone, and finally adjust the pH to 6.0 with 20% ammonia solution, and adjust the moisture content so that the active ingredient of the product is 25%.

[0042] The physical properties of the amphoteric leather retanning agent prepared in this example: Appearance, colorless or slightly light yellow transparent liquid; Odor, slight...

Embodiment 3

[0044] A preparation method of an amphoteric leather retanning agent, comprising the following steps:

[0045]In terms of parts by mass, add 202 parts of SMA copolymer, 103 parts of N,N-dimethylisopropanolamine and 1.525 parts of sulfuric acid to the reactor equipped with a condensing device, and add solvent DMSO610 twice the total amount of reactants Parts, react at 90°C for 3 hours, measure the hydroxyl value in the reaction system, in terms of solids, when the hydroxyl value is less than or equal to 10 (mgKOH / g), add 126 parts of dimethyl sulfate, react at 95°C for 4 hours, Then distill under reduced pressure at 0.07Mpa and 80°C for 1 hour to remove DMSO, and finally adjust the pH to 6.5 with 10% KOH aqueous solution, and adjust the moisture content so that the active ingredient of the product is 35%.

[0046] The physical properties of the amphoteric leather retanning agent prepared in this example: Appearance, colorless or slightly light yellow transparent liquid; Odor, s...

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Abstract

The invention discloses amphiprotic leather tanning agent and a preparation method thereof. The preparation method of the amphiprotic leather tanning agent comprises the following steps of: based on weight parts, adding an SMA (Styrene Maleic Anhydride) copolymer, N, N-dimethyl fatty alcohol amine and a catalyst to a reaction kettle in which a condensing device is installed; adding a solvent to react, and measuring a hydroxyl value in the reaction system; adding dimethyl sulfate to react when the hydroxyl value (in terms of solid) is smaller than and equal to 10 (mg KOH / g); distilling under reduced pressure under the vacuum condition to remove the solvent; and adjusting a pH value by using an alkali aqueous solution; and adjusting the mass concentration of the product to 20%-40%. The amphiprotic leather tanning agent disclosed by the invention not only retains the filling performance of the SMA tanning agent, but also improves the color fading defect of the SMA tanning agent. Meanwhile, the modified SMA tanning agent has good emulsifying dispersion; and the leather body, which is tanned again by the amphiprotic tanning agent, is full and soft, and is good in elasticity and higher in tensile strength and tearing strength.

Description

technical field [0001] The invention relates to the technical field of leather chemical production, in particular to an amphoteric leather retanning agent and a preparation method thereof. Background technique [0002] Among the leather retanning agents, organic resin tanning agents are mostly anionic retanning agents, such as SMA and its derivatives, but the disadvantage of SMA-Na as a leather retanning agent is that when the amount is large, the finished leather feels hard. At the same time, because the tanning agent contains a large number of carboxyl groups, it has a repulsive effect on negatively charged and acid dyes, which affects the dyeing of leather in the later stage, and is prone to discoloration, making the dyeing uneven and not bright. [0003] For the modification of SMA as a leather tanning agent, there are many methods, such as sulfonation modification of SMA. Due to the presence of sulfonic acid groups in the structure, the water solubility of SMA retanning...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/22C08F222/08C08F212/08C08F8/44
Inventor 许伟强西怀王加里张辉
Owner SHAANXI UNIV OF SCI & TECH
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