Method for preparing aldehyde-containing polyurethane-acrylate resin tanning agent

A technology of acrylic resin and methacrylic acid, applied in animal husbandry, chemical treatment of small raw hides/large raw hides/leather hides/furs, applications, etc. Pollution, reducing chromium salt content, reducing the effect of dosage

Inactive Publication Date: 2013-03-13
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, as mentioned earlier, polyurethane resin 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

[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 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 3 hours, 20.0 g of polyoxypropylene ether with a molecular weight of 1,000 was added, and the reaction was continued for 4 hours. Then cool to 30° C. and discharge to obtain a polymerizable nonionic polyurethane oligomer.

[0017] 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 Th...

Embodiment 2

[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 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 5 hours. Then it is cooled to 30°C and discharged to obtain a polymerizable nonionic polyurethane oligomer.

[0020] Add 30.0g 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 dropwise add a sodium hydroxide solution with a concentration of 30%, adjust the pH value to 5.5, and control The temp...

Embodiment 3

[0022]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 3 hours, 20.0 g of polyoxypropylene ether with a molecular weight of 2,000 was added, and the reaction was continued for 3 hours. Then it is cooled to 30°C and discharged to obtain a polymerizable nonionic polyurethane oligomer.

[0023] Add 10.0g of acrylic acid, 6.0g of methacrylic acid and 30.0g of distilled water into a 250ml four-necked 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, du...

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PUM

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Abstract

The invention relates to a method for preparing an aldehyde-containing polyurethane-acrylate resin tanning agent. The aldehyde-containing polyurethane-acrylate resin tanning agent is prepared from a polymerizable nonionic polyurethane oligomer and unsaturated aldehyde by carrying out radical copolymerization in distilled water. The tanning agent contains aldehyde group, can be combined with a covalent bond of hide collagen fibers, has obvious tanning function, can make leather obtain higher hydrothermal stability when reducing the use amount of a chrome tanning agent, has excellent selective filling property, can make the leather have soft and plump hand feeling and exquisite grain, can be assorted with the chrome tanning agent to use in the low pH value environment of chrom tanning and chrome retanning, is favorable to adsorption fixation of the chrome tanning agent, can obviously reduce content of chromium salt in chrom tanning liquid waste so as to greatly reduce pollution of the tanning liquid waste to the environment, is a novel multifunctional environment-friendly leather tanning material and is suitable for tanning processing of sofa leather, instep leather, clothing leather and the like.

Description

technical field [0001] The invention relates to a preparation method of leather chemical auxiliary agent, in particular to the preparation of aldehyde group-containing polyurethane-acrylic resin tanning agent. technical background [0002] Leather tanning materials refer to leather chemical materials that can strongly interact with raw hide collagen fibers, thereby improving the stability of hide collagen fiber bundles, converting raw hides into leather, and making them have higher moisture and heat stability. Leather tanning materials are the most critical class of chemical materials in the leather industry, and their performance directly determines the quality of the prepared leather. [0003] Leather tanning agents can be divided into two categories: inorganic tanning agents and organic tanning agents according to their chemical composition. Among the inorganic tanning agents, the most important ones are basic trivalent chromium salts (chrome tanning agents), in addition...

Claims

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Application Information

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Patent Type & Authority Patents(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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