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Nano modified leather polyurethane material and its preparing method

A polyurethane material, nano-modification technology, applied in textiles and papermaking, etc., to achieve the effect of convenient operation, good mechanical properties, and simple process

Inactive Publication Date: 2004-12-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And about the nano-SiO prepared by sol-gel method 2 The patent of particle sol used in polyurethane materials for leather has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] nano-SiO 2 Preparation of granular sol

[0028] Preparation of nano-SiO by sol-gel method 2 Granular material, with ethyl orthosilicate TEOS, absolute ethanol, deionized water and hydrochloric acid according to 1.0~10.0:20~70:1~6:2×10 -4 ~8×10 -4 (molar ratio) ratio mixing, fully stirring at room temperature, mixing uniformly, then placing the mixture in an airtight container and sealing it, hydrolyzing and aging for 5 to 30 days at room temperature to form a nano-sol.

Embodiment 2

[0030] Preparation of polyurethane resin

[0031] Add 30-100 parts of toluene diisocyanate (TDI), 50-120 parts of polycaproate polyol, 1-15 parts of triethanolamine, 1-10 parts of antioxidant, and 100-300 parts of solvent dimethylformamide with In a four-neck glass reactor with stirrer, thermometer and current controller, heat up to 70-85°C, react for 2-5 hours, then add 5-20 parts of chain extender, continue to react for 2-5 hours, then add catalyst two 1-5 parts of dibutyltin laurate and 20-50 parts of methyl ethyl ketone are used to obtain a polyurethane resin for leather with a solid content of 30%.

Embodiment 3

[0033] Preparation of Nano-modified Polyurethane Resin 1.

[0034] Add 30-100 parts of toluene diisocyanate (TDI), 50-120 parts of polycaproate polyol, 1-15 parts of triethanolamine, 1-10 parts of antioxidant, and 100-300 parts of solvent dimethylformamide with stirring In a four-neck glass reactor with a thermometer, a thermometer and a current controller, the temperature is raised to 70-85°C, and the reaction is carried out for 2-5 hours, and then the prepared nano-SiO 2 Particle sol 1 ~ 30 parts SiO with ultrasonic disperser 2 Disperse the nanoparticles into the polyurethane resin, then add 5-20 parts of chain extender, continue to react for 2-5 hours, then add 1-5 parts of dibutyltin dilaurate and 20-50 parts of butanone to prepare polyurethane for leather / SiO 2 nano-modified materials.

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Abstract

The nano modified polyurethane material consists of nano modified SiO2 particle sol and leather polyurethane resin. Nano SiO2 particle sol is first prepared through sol-gel process and then dispersed with ultrasonic dispersing machine to polyurethane resin to prepare leather polyurethane / nano modified SiO2 material, where nano SiO2 exists in sol form to result in homogeneous dispersion of nano particle in polymer. The nano modified polyurethane material may be stored stably in long period and may be used in producing leather with excellent mechanical performance, low temperature breaking performance, high temperature heat stability, drying performance and color performance.

Description

technical field [0001] The invention relates to the technical field of nano-composite materials, in particular to a polyurethane material for nano-modified leather and a preparation method thereof. Background technique [0002] Nanoparticles (with a particle size between 1 and 100nm) have special effects different from macroscopic particles, so they exhibit unique mechanical, optical, electrical, magnetic and chemical properties, which open up new opportunities for the preparation of excellent performance and multifunctional composite materials. A whole new way. At present, nanotechnology is applied to the modification of polymers. Compared with the original polymers, its performance has been greatly improved, and the processing performance has also been improved to a certain extent. [0003] With the depletion of natural resources, natural leather resources will become increasingly scarce. The emergence of simulated polyurethane leather has made up for its shortcomings to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/36C08L75/04D06N3/12
Inventor 沈军张志华吴广明倪星元周斌夏长生
Owner TONGJI UNIV
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