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Moisture-permeable and waterproof type no-yellowing polyurethane resin for shoe leather and preparation method

A polyurethane resin, moisture-permeable and waterproof technology, which is applied in the field of polyurethane resin and its preparation, can solve the problems of affecting product appearance and physical properties, yellowing and brittleness, lack of yellowing resistance, etc.

Inactive Publication Date: 2013-03-27
ZHEJIANG HUAFON SYNTHETIC RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The synthetic leather resin or synthetic leather products prepared by the above-mentioned patents have good moisture-permeable and waterproof effects, but they do not have yellowing resistance. They are prone to yellowing and brittleness when exposed to sunlight for a long time, affecting the appearance and physical properties of the product. Low folding resistance, only suitable for clothing leather, etc., not suitable for producing white or light-colored shoe leather

Method used

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  • Moisture-permeable and waterproof type no-yellowing polyurethane resin for shoe leather and preparation method
  • Moisture-permeable and waterproof type no-yellowing polyurethane resin for shoe leather and preparation method
  • Moisture-permeable and waterproof type no-yellowing polyurethane resin for shoe leather and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]

[0030]

[0031] 50kg of polyethylene glycol, 100kg of copolyether glycol of ethylene glycol and propylene glycol, 1kg of ethylene glycol, 2kg of 1,4-butanediol, 34kg of isophorone diisocyanate (IPDI), 26kg 4,4'-dicyclohexylmethane diisocyanate (HMDI), 0.2kg of antioxidant 245, 1.4kg of UV absorber Tinuvin101, 1.4kg of light stabilizer 765, 0.2kg of anti-blocking agent and 150kg of N,N -Dimethylformamide (DMF) was put into the reaction kettle together, reacted at 90°C for 4 hours, measured the content of isocyanate group (-NCO) in the mixed liquid, after it dropped to the theoretical value, then added 150kg of N,N -Dilution with dimethylformamide (DMF), add 20kg of isophorone diamine (IPDA) dropwise, react at 30°C, add DMF and MEK to dilute continuously during the process, to reach the required viscosity, add the remaining MEK and IBA, Stir at 70°C for 2 hours. After detecting the presence of -NCO groups, add 0.1kg of antioxidant 245, 0.8kg of ultraviolet absorbe...

Embodiment 2

[0033]

[0034]

[0035] 44kg of polyethylene glycol, 176kg of copolyether glycol of ethylene glycol and propylene glycol, 3kg of ethylene glycol, 3kg of 1,4-butanediol, 42kg of isophorone diisocyanate (IPDI), 50kg 4,4'-dicyclohexylmethane diisocyanate (HMDI), 0.3kg of antioxidant 245, 3.5kg of UV absorber Tinuvin101, 3.5kg of light stabilizer 765, 0.3kg of anti-blocking agent and 175kg of N,N -Dimethylformamide (DMF) was put into the reaction kettle together, reacted at 10°C for 2 hours, measured the content of isocyanate group (-NCO) in the mixed solution, after it dropped to the theoretical value, then added 175kg of N,N -dilute with dimethylformamide (DMF), add 40kg of 4,4'-diaminodicyclohexylmethane (HMDA) dropwise, react at 50°C, add DMF and MEK continuously during the process to reach the required viscosity, add the remaining MEK and IBA were stirred at 80°C for 2 hours, and after no -NCO groups were detected, 0.2kg of antioxidant 245, 3.0kg of ultraviolet absorbe...

Embodiment 3

[0037]

[0038]

[0039]50kg of polyethylene glycol, 250kg of copolyether glycol of ethylene glycol and propylene glycol, 4kg of 1,4-butanediol, 4kg of neopentyl glycol, 94kg of isophorone diisocyanate (IPDI), 1.0kg of antioxidant 245, 5.5kg of UV absorber Tinuvin101, 5.5kg of light stabilizer 765, 1.0kg of anti-adhesive agent and 250kg of N,N-dimethylformamide (DMF) were put into the reaction kettle together. React at 90°C for 2 hours, measure the content of isocyanate group (-NCO) in the mixture, after it drops to the theoretical value, add 250kg of N,N-dimethylformamide (DMF) to dilute, add dropwise 30kg of 4 , 4'-Diaminodicyclohexylmethane (HMDA) and 20kg of isophoronediamine (IPDA) reacted at 30°C, during which DMF and MEK were continuously added to dilute to reach the required viscosity, and the remaining MEK and IBA were added , stirred at 70° C. for 2 hours, after measuring the presence of no -NCO group, added 0.5 kg of antioxidant 245, 3.0 kg of ultraviolet abso...

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Abstract

The invention provides a moisture-permeable and waterproof type no-yellowing polyurethane resin for shoe leather and a preparation method. The polyurethane resin is prepared from the following constituents in parts by weight: 15-30 parts of polyalcohol, 5-10 parts of isocyanate, 0.3-0.8 part of dihydric alcohol, 2-5 parts of diamine and 60-75 parts of organic solvent. The polyurethane resin provided by the invention has yellowing resistance of not lower than 4.0 level, moisture permeability of greater than 3000 gH2O / 24 hr.m<2>, hydrostatic pressure resistance of greater than 5000 mmH2O, better moisture-permeable and waterproof effects compared with those of common polyurethane resin for shoe leather, and low-temperature folding resistance of greater than 80000 times. The moisture-permeable and waterproof type no-yellowing polyurethane resin for shoe leather is suitable for preparing light-colour or white shoe leather, and capable of enhancing the yellowing resistance, the durability and the wearing comfort of shoe leather.

Description

technical field [0001] The invention relates to a moisture-permeable and waterproof polyurethane resin and a preparation method thereof. Background technique [0002] Moisture-permeable and waterproof polyurethane synthetic leather for shoes is a kind of synthetic leather that can prevent rainwater from penetrating and discharge sweat vapor. Its finished shoes will not produce sticky and stuffy inside. [0003] Moisture permeability means that the steam released from the soles of the feet can diffuse outward during strenuous exercise to keep the inside of the shoe comfortable and dry. Water resistance means that the shoe leather has the ability to completely resist the penetration of external water mist. [0004] At present, there are many studies on moisture-permeable and waterproof polyurethane fabrics and polyurethane resins. The Chinese patent application with the application number 200310120808.5 discloses a waterproof, cold-proof and moisture-permeable polyurethane co...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32D06N3/14
Inventor 郑绍军薛敬钦张初银吴晓敏
Owner ZHEJIANG HUAFON SYNTHETIC RESIN
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