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A kind of vegetable oil derivative modified amphoteric polyurethane retanning agent and preparation method thereof

A technology of vegetable oil derivatives and polyurethane, which is applied in the field of leather retanning agents, can solve the problems of no related research on retanning agents, and achieve good biodegradability, low reaction temperature, and simple synthetic route

Active Publication Date: 2021-10-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Introducing ricinoleic acid into amphoteric polyurethane and applying it to the retanning process of leather, and the retanning agent with fatliquoring function in the retanning process has not yet been researched

Method used

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  • A kind of vegetable oil derivative modified amphoteric polyurethane retanning agent and preparation method thereof
  • A kind of vegetable oil derivative modified amphoteric polyurethane retanning agent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: be the amphoteric polyurethane of isocyanate synthetic ricinoleic acid modification by IPDI

[0019] Polyurethane prepolymer was obtained by reacting isophorone diisocyanate (IPDI), polytetrahydrofuran diether alcohol (PTMG-1000) and dibutyltin dilaurate (DBTDL) at 60°C for 3 h; Methylolpropionic acid (DMPA) and N ~Methyldiethanolamine (MDEA) was reacted for 3 hours; then ricinoleic acid (RA) was added to react for 3 hours; then the temperature was lowered to 40°C, neutralized by adding triethylamine, and emulsified with distilled water to obtain translucent blue light Amphoteric polyurethane emulsion.

[0020] IPDI:PTMG-1000:DMPA:MEDA:Molar ratio=16:5:3:3:3 of RA.

Embodiment 2

[0021] Embodiment 2: Change isocyanate from IPDI to diphenylmethane diisocyanate (MDI)

[0022] The polyurethane prepolymer was obtained by reacting diphenylmethane diisocyanate (MDI), PTMG-1000, and DBTDL at 65°C for 2 h; the temperature was raised to 85°C, and DMPA and MDEA were added to react for 2 h; then RA was added to react for 2 h; Lower the temperature to 45°C, add triethylamine for neutralization, and emulsify with distilled water to obtain a translucent blue-light amphoteric polyurethane emulsion.

[0023] The molar ratio of MDI:PTMG-1000:DMPA:MEDA:RA=16: 5: 3: 4: 2

Embodiment 3

[0024] Embodiment 3: Change isocyanate from IPDI to toluene diisocyanate (TDI)

[0025] React toluene diisocyanate (TDI) and PTMG-1000DBTDL at 75°C for 3 h to obtain a polyurethane prepolymer; raise the temperature to 90°C, add DMPA and MDEA to react for 3 h; then add RA for 2 h; then lower the temperature to Add triethylamine to neutralize at 50°C, and emulsify with distilled water to obtain translucent blue-light amphoteric polyurethane emulsion.

[0026] The molar ratio of TDI:PTMG-1000:DMPA:MEDA:RA=16:5:3:3.5:3

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Abstract

The invention discloses a vegetable oil derivative modified amphoteric polyurethane retanning agent and a preparation method thereof. Firstly, diisocyanate, polytetrahydrofuran diether alcohol and a catalyst are uniformly mixed for prepolymerization reaction, and anionic chain extenders 2 and 2 are successively added after heating up. ‑Dimethylolpropionic acid, cationic chain extender N ‑Methyldiethanolamine, then add ricinoleic acid into the system to react for a certain period of time, then cool down to neutralize, emulsify, and finally obtain ricinoleic acid modified amphoteric polyurethane retanning agent. The ricinoleic acid-modified amphoteric polyurethane retanning agent provided by the present invention contains both anion and cationic groups, which can effectively improve the absorption rate of chrome-free tanning, especially organic chrome-free tanned crust leather or fur, to leather chemicals, thereby improving Moisture and heat stability, handle, tear strength and other properties of chrome-free tanned leather and fur.

Description

technical field [0001] The invention relates to the technical field of leather retanning agents, in particular to an amphoteric polyurethane retanning agent modified by vegetable oil derivatives and a preparation method thereof. Background technique [0002] Currently, chrome tanning, the most commonly used method in the leather industry, has serious pollution problems. Therefore, research and development of chromium-free ecological leather manufacturing technologies such as non-chrome metal tanning and non-metal tanning is the future development direction of the leather industry. However, compared to chrome tanned leather fibers, non-metallic tanned leather fibers are strongly negatively charged and lack positively charged metal ions to ionize their surface, thus reducing the reactivity of non-metallic tanned leather fibers with traditional anionic reagents for leather sex. Therefore, research on leather retanning agents that can increase the isoelectric point of non-meta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/73C08G18/67C08G18/66C08G18/48C08G18/10C08G18/32C08G18/34C14C3/22
CPCC08G18/10C08G18/4854C08G18/6755C08G18/73C08G18/755C08G18/7614C08G18/7671C08G2230/00C14C3/22C08G18/3275C08G18/348
Inventor 王学川蓝晓梅刘新华朱兴韩庆鑫王园园
Owner SHAANXI UNIV OF SCI & TECH
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