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Waterproof and moisture-permeable polyurethane and preparation method and application thereof

A waterproof and moisture-permeable, polyurethane technology, applied in the field of polyurethane, can solve the problems that the waterproof and moisture-permeable properties are difficult to meet the requirements

Inactive Publication Date: 2020-10-30
QI HE LI HOU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent can relieve the human body's hot and humid discomfort to a certain extent, with the continuous improvement of the quality of life, people's requirements for waterproof and moisture-permeable film materials are also getting higher and higher. and moisture permeability are difficult to meet the requirements

Method used

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Examples

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preparation example Construction

[0035] The present invention also provides a method for preparing the waterproof and moisture-permeable polyurethane described in the above technical solution, which includes the following steps:

[0036] (1) Mix the fluorine-containing diol and diisocyanate, and perform the first polymerization reaction to obtain the first prepolymer;

[0037] (2) The first prepolymer obtained in the step (1) is sequentially mixed with a polypolyol and an organometallic catalyst to perform a second polymerization reaction to obtain a second prepolymer;

[0038] (3) Mixing the second prepolymer obtained in the step (2) and the hydrophilic chain extender to perform a third polymerization reaction to obtain a third prepolymer;

[0039] (4) Mixing the third prepolymer obtained in the step (3) and the fluorine-containing monohydric alcohol to perform a fourth polymerization reaction to obtain a fourth prepolymer;

[0040] (5) Mixing the fourth prepolymer obtained in the step (4) with a neutralizing agent, a...

Embodiment 1

[0054] (1) First put 12 parts of fluorine-containing glycol HO(CH 2 CHO) 17 (CF 2 CF 2 O) 8 (CF 2 O) 9 HO(CH 2 CHO) 17 OH was put into the reaction kettle, and then 55 parts of isophorone diisocyanate was added to the reaction kettle, and the temperature was controlled and reacted at 40°C for 2 hours to obtain the first prepolymer;

[0055] (2) Put 135 parts of polycaprolactone diol into the first prepolymer in the above reaction kettle, heat up to 85°C according to 20°C / h, react for 0.5h, then add 0.2 parts of organic silver catalyst, continue React for 1.5h to obtain the second prepolymer;

[0056] (3) Add 8 parts of dimethylolpropionic acid to the second prepolymer and react for a period of time to obtain the third prepolymer;

[0057] (4) Measure the amount of remaining isocyanate in the third polymer by the di-n-butylamine method. When the reaction degree reaches 80%, cool the third prepolymer to 60°C at 10°C / h and then add 4 parts of fluorine-containing monool dropwise. CF 3 (...

Embodiment 2

[0062] (1) First put 12 parts of fluorine-containing glycol HO (CH 2 CHO) 17 (CF 2 CF 2 O) 9 (CF 2 O) 9 HO(CH 2 CHO) 17 OH was put into the reaction kettle, and then 55 parts of hydrogenated phenylmethane diisocyanate was added to the reaction kettle, and the temperature was controlled and reacted at 50°C for 3 hours to obtain the first prepolymer;

[0063] (2) Put 125 parts of polycarbonate diol into the first prepolymer of the above reaction kettle, increase the temperature to 85°C at 20°C / h, react for 0.5h, then add 0.3 parts of organic bismuth catalyst, and continue the reaction for 1.5 h, to obtain the second prepolymer;

[0064] (3) Add 6 parts of dimethylol butyric acid to the second prepolymer and react for a period of time to obtain the third prepolymer;

[0065] (4) Use the di-n-butylamine method to determine the amount of remaining isocyanate in the third polymer. When the reaction degree reaches 83%, cool the third prepolymer to 60°C at 10°C / h and add 5 parts of fluorine-...

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PUM

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Abstract

The invention provides waterproof and moisture-permeable type polyurethane, which is prepared from the following raw materials in parts by mass: 110 to 150 parts of polyhydric alcohol, 45 to 60 partsof diisocyanate, 10 to 15 parts of fluorine-containing dihydric alcohol, 3 to 8 parts of fluorine-containing monohydric alcohol, 0.1 to 0.3 part of an organic metal catalyst, 7 to 10 parts of a hydrophilic chain extender, 5 to 8 parts of a neutralizer, 3 to 5 parts of a post-chain extender and 500 to 700 parts of water. According to the invention, polyhydric alcohol and diisocyanate are taken as main bodies, fluorine-containing dihydric alcohol is utilized to change the interface state of the material and improve the water resistance and moisture permeability, fluorine-containing monohydric alcohol is utilized to play a waterproof role in chain segments, and under the combined action of auxiliaries such as an organic metal catalyst, a hydrophilic chain extender and the like, the water resistance and moisture permeability are further improved. The embodiment shows that the polyurethane disclosed by the invention has the water pressure resistance of 78-88 KPa, the moisture permeability of 6.8-8.2 kg / m <2> / d and the air permeability of 5.7-6.3 mm / s.

Description

Technical field [0001] The invention belongs to the technical field of polyurethane, and specifically relates to a waterproof and moisture-permeable polyurethane and its preparation method and application. Background technique [0002] In recent years, work clothes made of polyvinyl chloride and neoprene have the advantages of being waterproof and preventing liquid leakage, and have become very popular. However, the sweat produced by the human body's own metabolism cannot be discharged from the body in time, causing people to feel uncomfortable such as stuffy heat and humidity. Therefore, researchers have developed waterproof and breathable film materials to solve the above problems. [0003] At present, waterproof and breathable film materials mainly include: polyacrylate resin and polyurethane resin. Among them, polyurethane resins are widely used in apparel industries such as leather finishing agents, coatings and textile auxiliaries due to their excellent heat resistan...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/50C08G18/42C08G18/34C08G18/28C08G18/32C08G18/10C08G18/44C09D175/04C14C11/00
CPCC08G18/10C08G18/2885C08G18/3228C08G18/3271C08G18/348C08G18/4018C08G18/4277C08G18/44C08G18/5015C08G18/6618C08G18/6622C08G18/6625C09D175/04C14C11/006
Inventor 王顺平冯练享白瑞卿
Owner QI HE LI HOU CHEM CO LTD
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