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A kind of functional waterborne polyurethane leather finishing agent and preparation method thereof

A technology of water-based polyurethane and leather finishing agent, which is applied in leather surface treatment, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc. It can solve environmental damage and other problems, Achieve the effects of increasing reaction sites, improving heat resistance stability and mechanical strength, and strong antibacterial and antifungal properties

Inactive Publication Date: 2017-06-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solvent-based polyurethane coatings have many varieties and are widely used, and occupy a very important position in coating products, but solvent-based polyurethanes will cause great damage to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Measure 3 mL of tetrabutyl titanate and add it to 6 mL of PEG400, stir at high speed, react for a period of time, and obtain a viscous solution; add concentrated hydrochloric acid to the obtained viscous solution, adjust the pH to 2, and dope a small amount of FeCl 3 After continuing to stir for a period of time, transfer it to a high-pressure reactor, react at 150 ° C for 6 h, wash with absolute ethanol, centrifuge, and dry to obtain Fe-doped, surface PEGylated nano-TiO 2 . Weigh 0.6g of the above-mentioned prepared nano-TiO 2 Dissolve in 2g PEG400, pour into a three-necked flask, dehydrate under vacuum at 110°C for 2h; lower the reaction temperature to 70°C, switch to nitrogen in vacuum, add 30mL tetrahydrofuran solvent, quickly add 4g isophorone diisocyanate, drop 3 drops of dibutyltin dilaurate catalyst, reacted for 1.5h; the temperature of the reaction device was raised to 80°C, and 1.07g of hydrophilic chain extender 2,2-dimethylol propionic acid was added, and r...

Embodiment 2

[0028] Mix 3 mL of tetrabutyl titanate with 6 g of PEG2000, stir at high speed, and react for a period of time to obtain a viscous solution; add concentrated hydrochloric acid to the obtained viscous solution to adjust the pH to 4, and dope a small amount of KIO 3 , stirred for a period of time, transferred to an autoclave, reacted at 150°C for 7 hours, washed with absolute ethanol, centrifuged, and dried to obtain I-doped, surface PEGylated nano-TiO 2 . Weigh 0.7g of the above-mentioned prepared nano-TiO 2 Dissolve in 2g PEG2000, pour into a three-necked flask, dehydrate under vacuum at 110°C for 2.5h; lower the reaction temperature to 80°C, switch to nitrogen in vacuum, add 30mL tetrahydrofuran solvent dropwise, quickly add 4g isophorone diisocyanate, add dropwise 3 drops of dihydrofuran Dibutyltin laurate catalyst, react for 2 hours; the temperature of the reaction device is raised to 90°C, add 1.07g of 2,2-dimethylol propionic acid, react for 1 hour; weigh 0.72g of 1,4-bu...

Embodiment 3

[0030] Measure 3.5 mL of tetraisopropyl titanate and add it to 6 g of PEG2000, stir at high speed, and react for a period of time to obtain a viscous solution; add concentrated hydrochloric acid to the obtained viscous solution to adjust the pH to 3, and dope a small amount of KIO 3 , continue to stir for a period of time, transfer to a high-pressure reactor, react at 160 ° C for 5 h, wash with absolute ethanol, centrifuge, and dry to obtain I-doped, surface PEGylated nano-TiO 2 . Weigh 0.6g of the above-mentioned prepared nano-TiO 2 Dissolve in 2.5g of polytetrahydrofuran, pour into a three-necked flask, dehydrate in vacuum at 110°C for 2.5h; lower the reaction temperature to 70°C, switch to nitrogen in vacuum, add 40mL of tetrahydrofuran solvent dropwise, and quickly add 4g of isophorone di For isocyanate, add 3 drops of dibutyltin dilaurate catalyst dropwise and react for 1.5h; the temperature of the reaction device is raised to 80°C, add 1.2g of 2,2-dimethylol propionic a...

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Abstract

The invention provides a functional waterborne polyurethane leather finishing agent and a preparation method thereof. The method includes the steps that firstly, doping type surface-PEGlated nanometer titanium dioxide is prepared through a solvent-thermal method and then dissolved in polymer polyhydric alcohol, and modified nanometer titanium dioxide with visible-light responses is introduced to polyurethane through in-situ polymerization. The waterborne polyurethane leather finishing agent prepared through the method contains the nanometer titanium dioxide with the visible-light responses and is high in sterilization and mould-proof capacity due to the fact that visible light in sunlight can be completely utilized; PEG is grafted to the surface of the nanometer titanium dioxide, and in combination with photocatalytic activity of the nanometer titanium dioxide and the excellent protein adsorption resistance of the PEG, the self-cleaning function of a polyurethane coating is remarkably improved. Good dispersion of the nanometer titanium dioxide in polyurethane can be effectively promoted, the heat-resisting stability and mechanical strength of the coating are improved, and meanwhile the transparency of finishing materials is kept.

Description

technical field [0001] The invention relates to the research field of self-cleaning materials and water-based polyurethane leather finishing materials, in particular to a functional water-based polyurethane leather finishing agent with photocatalytic degradation of surface organic pollutants, bactericidal and anti-mildew properties and a preparation method thereof. Background technique [0002] Self-cleaning materials have the advantages of being environmentally friendly and saving cleaning costs, and are increasingly favored by the market and widely concerned by the academic community. Currently, two types of self-cleaning coating agents have been developed based on different self-cleaning principles. One is the super-hydrophobic self-cleaning finishing agent, which rolls away dust through water droplets to achieve a self-cleaning function similar to lotus leaves. However, such materials have problems such as complex preparation process, small preparation area, poor mechan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/44C08K9/04C08K3/22C09D175/08C09D175/06C09D7/12C14C11/00
CPCC08G18/10C08G18/3206C08G18/348C08G18/44C08G18/4833C08G18/4854C08G18/6674C08G18/6692C08K3/22C08K9/04C08K2003/2241C09D7/62C09D175/06C09D175/08C14C11/006
Inventor 穆畅道张美洲李德富施逸枫
Owner SICHUAN UNIV
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