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A kind of polycarbonate polyol and its preparation method and application

A polycarbonate and polyol technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of lowering the glass transition temperature, reducing the chemical resistance of finished products, and the polyurethane film is too soft, achieving excellent mechanical strength, good Effects of mechanical properties and widening application fields

Active Publication Date: 2019-12-31
ETERNAL CHEM (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, TW I567104 B provides that the moisture content of polycarbonate polyol can be adjusted to achieve the desired polyurethane transparency, but it will cause the molecular weight of polyurethane to fail to increase, thereby reducing the chemical resistance of the finished product; Although water polyether forms block copolymer can increase its transparency, because the heat resistance of polyether structure is relatively poor, so this block copolymer has the situation of heat resistance deficiency; The odd-even disclosed in aforementioned CN 102850502 B The carbon number effect will reduce the glass transition temperature of its polycarbonate polyol, resulting in the resulting polyurethane film being too soft and having poor mechanical properties. In addition, its components must be maintained at a specific mixing ratio in order to achieve a transparent effect

Method used

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  • A kind of polycarbonate polyol and its preparation method and application
  • A kind of polycarbonate polyol and its preparation method and application
  • A kind of polycarbonate polyol and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Firstly, the four-neck reaction flask was connected to the condensing device and set up, and the air-nitrogen replacement was performed back and forth three times. At this time, the nitrogen gas was turned on, and 1 mole (118 g) of 1,6-hexanediol was added into the reactor, the temperature of the reactor was raised to 100° C., and water was removed under vacuum for 1 hour. Afterwards, fill up nitrogen again, lower the temperature to 60°C, add a small amount of catalyst sodium hydride and 1.285 moles (115.6 grams) of dimethyl carbonate into the reactor and mix evenly, adjust the reaction temperature to 80°C, and the temperature at the top of the tower can be observed to rise to 60-64°C, and remove methanol and dimethyl carbonate, and record the amount of liquid removed.

[0103] Then slowly increase the reaction temperature until 190°C, set up a vacuum system device, and depressurize to 20mmHg; then check the viscosity and hydroxyl value every hour until the hydroxyl val...

Embodiment 2

[0106] First, the reactor was set up, and the air-nitrogen replacement was performed back and forth three times. At this time, the nitrogen gas was turned on, and 1 mole (104 g) of 1,5-pentanediol was added into the reactor, and the temperature of the reactor was raised to 100° C., and water was removed under vacuum for 1 hour. Afterwards, fill up with nitrogen again, lower the temperature to 60°C, add a small amount of catalyst sodium hydride and 1.294 moles (116.46 grams) of dimethyl carbonate into the reactor and mix evenly, adjust the reaction temperature to 80°C, and the temperature at the top of the tower can be observed to rise to 60-64°C, and remove methanol and dimethyl carbonate, and record the amount of liquid removed.

[0107] Then slowly increase the reaction temperature until it reaches 190°C, put a vacuum system on it, and reduce the pressure to 20mmHg; then check the viscosity and hydroxyl value every hour until the hydroxyl value shows that the obtained polyca...

Embodiment 3

[0110] First, the reactor was set up, and the air-nitrogen replacement was performed back and forth three times. At this time, the nitrogen gas was turned on, and 1.5 moles (135 grams) of 1,4-butanediol was added into the reactor, and the temperature of the reactor was raised to 100° C., and water was removed under vacuum for 1 hour. Afterwards, fill up nitrogen again, lower the temperature to 60°C, add a small amount of catalyst sodium hydride and 1.955 moles (175.99 grams) of dimethyl carbonate into the reactor and mix evenly, adjust the reaction temperature to 80°C, and the temperature at the top of the tower can be observed to rise to 60°C, remove methanol and dimethyl carbonate, and record the amount of removed liquid.

[0111] Then slowly increase the reaction temperature until it reaches 190°C, put a vacuum system on it, and reduce the pressure to 20mmHg; then check the viscosity and hydroxyl value every hour until the hydroxyl value shows that the obtained polycarbonat...

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Abstract

The invention discloses polycarbonate polyols, and a preparation method and applications thereof. The polycarbonate polyols comprise repetitive units disclosed as Formula (A) and terminal groups, wherein R is C3-C15 bivalent aliphatic hydrocarbons; and 92-99.9% of the terminal groups are hydroxyls. In 1H-NMR of the polycarbonate polyols, when deuterated chloroform is used as a solvent and primary standard substance, the chemical shift of the deuterated chloroform signal is set at 7.26ppm; and when the 3.90-4.45ppm signal integral value is set at 1000, the 3.70-3.85ppm signal integral quantity is 0.1-10.

Description

technical field [0001] The present invention relates to polycarbonate polyol, which is suitable for thermoplastic polyurethane, waterborne polyurethane or reactive adhesive. The invention also relates to the preparation method and application of the polycarbonate polyol. Background technique [0002] Polyurethane (PU) is widely used in various industrial fields, such as elastomers, lenses, synthetic leather, coagulated powder, spandex, coatings, adhesives, sealing materials and foams. Polycarbonate polyols are generally used as soft segment raw materials in thermoplastic polyurethane, waterborne polyurethane or reactive adhesives. However, when crystalline polycarbonate polyol is used as the soft segment raw material, the appearance of the obtained polyurethane (such as thermoplastic polyurethane elastomer and water-based polyurethane film) is often opaque, which leads to limitations in application and cannot be applied to transparent appearance. For example, it cannot be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/30C08G64/02C09D175/04C08L75/04C08G18/66C08G18/44C08G18/34C08G18/32
CPCC08G18/3206C08G18/3228C08G18/348C08G18/44C08G18/664C08G18/6659C08G64/0208C08G64/305C08J5/18C08J2375/04C08L75/04C08L2201/10C08L2203/16C08L2207/04C09D175/04
Inventor 蒋秉叡许彦琦
Owner ETERNAL CHEM (CHINA) CO LTD
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