A kind of epoxy leather tanning agent and preparation method thereof

A technology for tanning agent and leather, applied in the field of tanning agent for leather tanning and its preparation, can solve the problems of high cost, intolerant storage of water-based epoxy compounds, long tanning time, etc., and achieves high humidity and heat resistance stability, excellent yellowing resistance The effect of changing properties and reducing product viscosity

Active Publication Date: 2020-03-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] From the above reports, the current research is mostly on the application of epoxy resin in the leather tanning process, starting from the molecular structure of collagen and the multi-level structure of collagen fibers, designing and synthesizing epoxy resin with suitable molecular structure and size. There are few studies on epoxy resins; the epoxy resin tanning agents that have been used have problems such as long tanning time, high cost, large dosage, and water-based epoxy compounds are not resistant to storage at room temperature, so it is difficult to use them as leather tanning agents on a large scale

Method used

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  • A kind of epoxy leather tanning agent and preparation method thereof
  • A kind of epoxy leather tanning agent and preparation method thereof
  • A kind of epoxy leather tanning agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Put 17g (0.1mol) of isophoronediamine in a water bath at normal temperature, and add 37g (0.4mol) of epichlorohydrin dropwise at a rate of 20 drops / min while stirring, and react at a constant temperature of 25°C for 4 hours in a water bath. Then add 36.8g (0.4mol) of glycerol and 0.32g of boron trifluoride diethyl ether in sequence, then add 111g (1.2mol) of epichlorohydrin dropwise at a rate of 50 drops / min, and then raise the temperature to 50°C for constant temperature reaction 5h, then dropwise add 160g (1.6mol) sodium hydroxide solution (concentration is 40%) when cooling to 45°C, continue constant temperature reaction for 2h, finally add the mass ratio of 1:1 potassium dihydrogen phosphate (concentration is 20%) ) solution and acetic acid (60% concentration) to neutralize the product to a neutral pH. The upper product is subjected to rotary distillation to evaporate unreacted epichlorohydrin and residual water, and the epoxy leather tanning agent is obtained after...

Embodiment 2

[0046] Put 17g (0.1mol) of isophoronediamine in a water bath at normal temperature, add 37g (0.4mol) of epichlorohydrin dropwise at a rate of 25 drops / min while stirring, and react at a constant temperature for 2 hours in a water bath at 30°C. Then add 160g (0.4mol) of polyethylene glycol 400 and 0.71g of boron trifluoride ethyl ether in sequence, then add 74g (0.8mol) of epichlorohydrin dropwise at a rate of 60 drops / min, and heat up to 60°C after the dropwise addition React at constant temperature for 4 hours, then add dropwise 120g (1.2mol) sodium hydroxide solution (concentration 40%) when cooling to 30°C, continue constant temperature reaction for 3 hours, and finally add potassium dihydrogen phosphate (concentration 20% ) solution and acetic acid (concentration 50%) to neutralize the product to a neutral pH value. The upper product is subjected to rotary distillation to evaporate unreacted epichlorohydrin and residual water, and the epoxy leather tanning agent is obtaine...

Embodiment 3

[0049] Put 17g (0.1mol) of isophoronediamine in a water bath at room temperature, add 46.2g (0.5mol) of epichlorohydrin dropwise at a rate of 20 drops / min while stirring, and react at a constant temperature for 3 hours in a water bath at 30°C , then add 27.6g (0.3mol) glycerol and 0.45g tetrabutylammonium bromide successively, then dropwise add 92.52g (1.0mol) epichlorohydrin at a speed of 60 drops / minute, and heat up to 55 ℃ constant temperature reaction for 4 hours, and then dropwise added 151g (1.35mol) potassium hydroxide solution (concentration 50%) when cooling to 25 ℃, continued constant temperature reaction for 4 hours, and finally added sodium dihydrogen phosphate (concentration 20% concentration) with a mass ratio of 5:1 %) solution and acetic acid (concentration 50%) to neutralize the product to a neutral pH value. The upper product is subjected to rotary distillation to evaporate unreacted epichlorohydrin and residual water, and the epoxy leather tanning agent is o...

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Abstract

The invention discloses an epoxy leather tanning agent and a preparation method thereof. The preparation method comprises the steps that a part of epoxy chloropropane is dropwise added into isophoronediamine at first and reacts at the temperature of 25-35 DEG C for 2-4 h, after polyatomic alcohol and a catalytic agent are sequentially added, the other part of the epoxy chloropropane is dropwise added, after all the epoxy chloropropane is added, the temperature is raised to 50-70 DEG C, reaction is conducted for 3-8 h, an alkali compound is dropwise added when the temperature is lowered to 20-45 DEG C, reaction is conducted for 2-4 h, finally, a neutralizer is added for neutralization till the pH value is neutral, an upper-layer product is rotated and filtered, the epoxy leather tanning agent comprising the following formula is obtained, and the formula can be seen in the specification. The epoxy leather tanning agent is low in production cost, can be stably stored for longer than 6 months at the normal temperature, and is low in viscosity, good in heat stability, wide in molecular weight distribution and short in tanning time, the tanned leather is pure white, full and good in hydrothermal stability and yellowing resistance, and the storage stability is good.

Description

technical field [0001] The invention belongs to the technical field of leather chemicals and their synthesis, in particular to a tanning agent for leather tanning and a preparation method thereof, in particular to a tanning agent containing epoxy functional groups, and simultaneously containing glycidyl amine segments and glycidyl ether Segmented leather tanning agent and its preparation method. Background technique [0002] In the tanning industry, chrome tanned leather has the advantages of good physical and mechanical strength, full hand feeling, good heat resistance, wear resistance, storage resistance, and mature technology, and has been occupying a dominant position for nearly a hundred years. However, in the chrome tanning process, the absorption rate is not high (only about 65% of the chromium is absorbed), the environmental pollution load is relatively large, and the wastes containing chromium are difficult to deal with. Therefore, chrome-free tanning technology ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08
CPCC14C3/08
Inventor 廖学品庞晓燕周建飞石碧
Owner SICHUAN UNIV
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