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Isocyanate-based fur tanning agent and preparation method thereof

A technology of isocyanate and diisocyanate, applied in the field of isocyanate-based fur tanning agent and preparation thereof, can solve the problems of extra storage cost, unfavorable storage of compounds, etc., achieve the effect of large market competition advantage, omit synthesis steps, and shorten reaction time.

Inactive Publication Date: 2016-07-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, its compounds are not conducive to storage and require additional storage costs in commercial use

Method used

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  • Isocyanate-based fur tanning agent and preparation method thereof
  • Isocyanate-based fur tanning agent and preparation method thereof
  • Isocyanate-based fur tanning agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dissolve 0.05mol polyethylene glycol (Mn=400) in 80mL of mixed toluene and ethyl acetate, then add 0.11mol IPDI and 1-2 drops of dibutyltin dilaurate catalyst, and react at 40°C for 3h. After the reaction was completed, the toluene and ethyl acetate solvents were evaporated by rotary evaporation under reduced pressure to obtain an intermediate product, which was dissolved in an ethanol solution. An aqueous solution of sodium bisulfite containing 0.11 mol was added to the above ethanol solution, and reacted at a constant temperature of 5° C. for 2 hours. Ethanol was removed by rotary evaporation again to obtain the aqueous solution of the target tanning agent product.

Embodiment 2

[0040] Dissolve 0.05mol propylene glycol in 80mL of mixed acetone and toluene, then add 0.11mol MDI and 1-2 drops of dibutyltin dilaurate catalyst, and react at 40°C for 3h. After the reaction was completed, the acetone and toluene solvents were evaporated by rotary evaporation under reduced pressure to obtain an intermediate product, which was dissolved in ethanol solution. An aqueous solution of sodium bisulfite containing 0.11 mol was added to the above ethanol solution, and reacted at a constant temperature of 5° C. for 2 hours. Ethanol was removed by rotary evaporation again to obtain the aqueous solution of the target tanning agent product.

Embodiment 3

[0042] 0.05mol polyethylene glycol (Mn=1000) was dissolved in 80mL tetrahydrofuran solvent, then 0.11mol HDI and 1-2 drops of dibutyltin dilaurate catalyst were added, and reacted at 40°C for 3h. After the reaction was completed, the tetrahydrofuran solvent was evaporated by rotary evaporation under reduced pressure to obtain an intermediate product, which was dissolved in ethanol solution. An aqueous solution of potassium bisulfite containing 0.11 mol was added to the above ethanol solution, and the reaction was carried out at a constant temperature of 5° C. for 2 hours. Ethanol was removed by rotary evaporation again to obtain the aqueous solution of the target tanning agent product.

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Abstract

The invention discloses an isocyanate-based fur tanning agent and a preparation method thereof. The process is to use diisocyanate molecules to cap the fatty diol or polyether diol at both ends under catalytic conditions and in a mixed solution to obtain a prepolymer with high selectivity and high conversion rate; The isocyanate groups at both ends of the prepolymer are protected to improve the water solubility of the compound and finally obtain the tanning agent. The tanning agent has a controllable molecular weight and is suitable for tanning fur with different fiber structures. During the tanning process, it can effectively penetrate into the skin collagen, and the bisulfite decomposes under the condition of rising temperature and alkali, and the tanning agent molecule re-exposes the isocyanate group to react with the amino group on the collagen molecule, and cross-links the skin collagen to To achieve the purpose of tanning. The whole process only releases neutral salts, does not produce heavy metal ions and free aldehyde groups, simplifies the purification procedure, is environmentally friendly, and low in price, and is very suitable for tanning fur, especially light-colored rabbit skin.

Description

technical field [0001] The invention relates to a fur tanning agent, in particular to an isocyanate-based fur tanning agent and a preparation method thereof. The invention belongs to the technical field of fur ecological tanning agents containing special functional groups. Background technique [0002] In recent years, my country's fur industry has gradually shown a trend of healthy development, and fur processing and trade in its products occupy a pivotal position in the world. However, in recent years, the technical barriers and ecological indicators have become more stringent, thus restricting the export of fur products in my country. Therefore, there is an urgent need to develop clean chemical tanning agents that meet the requirements of the environment and human health. [0003] Traditional fur tanning mainly uses chrome tanning agents and organic aldehyde tanning agents. The former will produce a large amount of heavy metal chromium during tanning, while the free al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08
Inventor 张宗才李双丽刘公岩戴红陈莺莺
Owner SICHUAN UNIV
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