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Method for preparing acid-resistance polyurethane-acrylic resin retanning agent

A technology of acrylic resin and polyurethane, which is applied in the field of preparation of leather chemical additives. It can solve the problems of insufficient molecular weight, limited wide use, flat and thin leather, etc., to achieve reduced chromium salt content, excellent performance-price ratio, and fine grain Effect

Inactive Publication Date: 2010-10-27
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyurethane retanning agents are usually oligomers, the molecular weight is not high enough, there are defects such as poor filling, flat and thin leather, and the price is expensive, which limits its wide use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Dry the 250ml four-necked bottle, stirrer, feeding tube and other instruments at 120°C for 2 hours, take it out and place it in a desiccator to cool. Add 20.0g of polyoxyethylene ether with a molecular weight of 1,000 and a vinyl end to a 250ml four-necked bottle with a stirrer and a thermometer, heat it to 80°C while stirring, add 0.01g of dibutyltin dilaurate, stir and mix for 10 Minutes, then 3.48 g of toluene diisocyanate (TDI) was added dropwise. After reacting for 2 hours, 20.0 g of polyoxyalkylene ether with a molecular weight of 1,000 was added, and the reaction was continued for 2 hours. Then cool to 30° C. and discharge to obtain a polymerizable nonionic polyurethane oligomer.

[0014] Add 15.0g of acrylic acid and 30.0g of distilled water into a 250ml four-necked bottle with a stirring and condenser, stir and mix evenly, then slowly add a 20% sodium hydroxide solution dropwise to adjust the pH value to 4.0, during which the reaction liquid is controlled The...

Embodiment 2

[0016] Dry the 250ml four-necked bottle, stirrer, feeding tube and other instruments at 120°C for 2 hours, take it out and place it in a desiccator to cool. Add 8.0g of polyoxyethylene ether with a molecular weight of 400 and vinyl end to a 250ml four-necked bottle equipped with a stirrer and a thermometer, heat to 75°C under stirring, add 0.02g of dibutyltin dilaurate, stir and mix for 10 Minutes, then 3.48 g of toluene diisocyanate (TDI) was added dropwise. After reacting for 2 hours, 8.0 g of polyoxypropylene ether with a molecular weight of 400 was added, and the reaction was continued for 2 hours. Then it is cooled to 30°C and discharged to obtain a polymerizable nonionic polyurethane oligomer.

[0017] Add 32.0g of methacrylic acid and 40.0g of distilled water into a 250ml four-necked bottle with stirring and condenser, stir and mix evenly, then slowly add a concentration of 30% sodium hydroxide solution dropwise, adjust the pH value to 5.5, and control The temperature...

Embodiment 3

[0019] Dry the 250ml four-necked bottle, stirrer, feeding tube and other instruments at 120°C for 2 hours, take it out and place it in a desiccator to cool. Add 10.0g of polyoxyethylene ether with a molecular weight of 1,000 and a vinyl end to a 250ml four-neck bottle equipped with a stirrer and a thermometer, heat to 70°C while stirring, add 0.02g of dibutyltin dilaurate, stir and mix for 10 Minutes, then 1.74 g of toluene diisocyanate (TDI) was added dropwise. After reacting for 2 hours, 20.0 g of polyoxypropylene ether with a molecular weight of 2,000 was added, and the reaction was continued for 2 hours. Then it is cooled to 30°C and discharged to obtain a polymerizable nonionic polyurethane oligomer.

[0020] Add 12.0g of acrylic acid, 6.0g of methacrylic acid and 30.0g of distilled water into a 250ml four-neck bottle with stirring and condenser, stir and mix evenly, then slowly add potassium hydroxide solution with a concentration of 20% to adjust the pH value 6.0, dur...

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PUM

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Abstract

The invention provides a method for preparing an acid-resistance polyurethane-acrylic resin retanning agent. In the method, acrylic acid or methacrylic acid which accounts for 50 to 80 percent of the total weight of monomers, polymerizable non-ionic polyurethane oligomer which accounts for 15 to 40 percent of the total weight of the monomers and is prepared by a specific method and methyl acrylate or acrylonitrile which accounts for 5 to 30 percent of the total weight of the monomers are dissolved in distilled water in an amount which is 1 to 5 times the total weight of the monomers to form the acid-resistance polyurethane-acrylic resin retanning agent through free radical copolymerization. The retanning agent has high selective fallibility, and offers a soft and full handfeel and fine granular texture to leather. Moreover, the retanning agent can be used in a low pH-value environment in the last stage of chromium tanning or chromium retanning to promote the absorption and fixation ofa chromium tanning and obviously reduce the chromium salt content of chromium tanning waste liquid obviously, and thus the pollution caused by the tanning waste liquid to the environment greatly. Theacid-resistance polyurethane-acrylic resin retanning agent is a novel multifunctional environmentally-friendly leather retanning material and is suitable to be used for the retanning processing of garment leather, shoe upper leather, sofa leather and the like.

Description

technical field [0001] The invention relates to a preparation method of a leather chemical auxiliary agent, in particular to the preparation of an acid-resistant polyurethane-acrylic resin retanning agent. Background technique [0002] Leather retanning agent is a fine chemical material used for retanning of chrome tanned leather in the leather production process, and it occupies an important position in leather chemical auxiliary agents. As an important class of leather retanning materials, polymer resin retanning agents can endow leather with excellent selective filling and fullness due to their large molecular weight, numerous functional groups, and adjustable molecular structure. Therefore, it has been widely used in various leather tanning processes, and is expected to play an important role in the prevention of chromium pollution in tanning through appropriate molecular design, and promote the clean production process of the tanning industry. [0003] Acrylic resin re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/22C08F283/00C08G18/73
Inventor 金勇马春彦曹志峰苗青张彪
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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