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Fur tanning agent based on isocyanate and preparation method of fur tanning agent

A technology of isocyanate and diisocyanate, applied in the field of isocyanate-based fur tanning agent and preparation thereof, can solve problems such as unfavorable storage of compounds, extra storage cost, etc., and achieve the effects of omitting synthesis steps, competitive advantages in a large market, and soft leather

Inactive Publication Date: 2014-10-01
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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  • Fur tanning agent based on isocyanate and preparation method of fur tanning agent
  • Fur tanning agent based on isocyanate and preparation method of fur tanning agent
  • Fur tanning agent based on isocyanate and preparation method of fur tanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 0.05 mol of polyethylene glycol (Mn=400) was dissolved in 80 mL of mixed toluene and ethyl acetate, then 0.11 mol of IPDI and 1-2 drops of dibutyltin dilaurate catalyst were added, and reacted at 40°C for 3 h. 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 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.

Embodiment 2

[0040] 0.05 mol of propylene glycol was dissolved in 80 mL of mixed acetone and toluene, then 0.11 mol of MDI and 1-2 drops of dibutyltin dilaurate catalyst were added, and the reaction was carried out at 40°C for 3 h. 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 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.

Embodiment 3

[0042] 0.05 mol polyethylene glycol (Mn=1000) was dissolved in 80 mL tetrahydrofuran solvent, then 0.11 mol HDI and 1-2 drops of dibutyltin dilaurate catalyst were added, and reacted at 40 °C for 3 h. 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 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 a fur tanning agent based on isocyanate and a preparation method of the fur tanning agent. According to the process, diisocyanate molecules are adopted to perform end-capping on two ends of fat-diol or polyether glycols in a mixed solution under the condition of catalysis, and prepolymer with high selectivity and high conversion rate is obtained; then, hydrosulphite is adopted to protect isocyanate groups on two ends of the prepolymer, the water solubility of the compound is increased, and the tanning agent is obtained finally. The molecular weight of the tanning agent can be controlled, thereby being applicable to tanning of furs with different fibrous textures; during the tanning process, the fur tanning agent can effectively permeate to the position among the fur collagen; hydrosulphite decomposes under the condition of raised temperature and raised alkali, the tanning agent molecule expose the isocyanate group to cause the isocyanate group to react with the amino group on the collagen molecule, crosslinking of the fur collagen is realized, and the purpose of tanning is achieved; only neutral salt is released during the entire process, heavy metal ions or free aldehyde groups are not generated, the process is simplified, the fur tanning agent is environment friendly, the price is low, the fur tanning agent is very suitable for fur, especially tanning of rabbit fur with light color.

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 Applications(China)
IPC IPC(8): C14C3/08
Inventor 刘公岩
Owner SICHUAN UNIV
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