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Polycarbonate diol composition

A polycarbonate diol, polycarbonate technology, used in polyurea/polyurethane coatings, coatings, textiles and papermaking, etc., can solve the problems of heat resistance, poor weather resistance, poor hydrolysis resistance, etc., and achieve film-forming properties. Excellent effect, excellent low temperature flexibility, excellent oleic acid resistance and heat and humidity resistance

Pending Publication Date: 2022-05-27
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although polyurethane using polyether polyol is excellent in flexibility and hydrolysis resistance, it is inferior in heat resistance and weather resistance.
In addition, although polyurethane using polyester polyol has improved heat resistance and weather resistance, it has poor hydrolysis resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0211] Hereinafter, the present embodiment will be described more specifically with reference to specific examples and comparative examples, but the present embodiment is not limited to these examples and comparative examples at all unless the gist of the present embodiment is exceeded. In this example, unless otherwise stated, "parts" and "%" are based on mass standards.

[0212] The physical properties and evaluations in Examples and Comparative Examples described later were measured and evaluated by the methods shown below.

[0213] [Property 1] Hydroxyl Value

[0214] The hydroxyl value of polycarbonate diol (composition) is measured by the following method.

[0215]First, using a volumetric flask, pyridine was added to 12.5 g of acetic anhydride to prepare 50 mL, and an acetylating reagent was prepared. Next, 2.5 g of the sample was precisely weighed into a 100 mL eggplant-shaped flask. Next, 5 mL of the acetylation reagent and 10 mL of toluene were added to the eggpla...

Synthetic example 1

[0268] [Synthesis example 1] Production of polycarbonate diol P-1

[0269] 230 g of 1,5-pentanediol, 250 g of 1,6-hexanediol, and carbonic acid were put into a 1-L glass flask (hereinafter also referred to as "reactor") equipped with a rectification column filled with regular packing and a stirring device. After 400 g of ethylene ester, 0.0468 g of titanium tetra-n-butoxide was added as a catalyst. The reactor was immersed in an oil bath at 180°C, and the reaction was performed at a reaction temperature of 165°C for 12 hours while extracting a part of the distillate. Next, the reactor was directly connected to the condenser, the temperature of the oil bath was raised to 180° C., the pressure was gradually lowered, and the reaction was further carried out for 3 hours to obtain polycarbonate diol P-1 that was liquid at room temperature (466g). The hydroxyl value of the obtained polycarbonate diol P-1 was 55.2 mgKOH / g. In addition, the number average molecular weight of the ob...

Synthetic example 2

[0270] [Synthesis example 2] Production of polycarbonate diol P-2

[0271] 270 g of 1,6-hexanediol, 250 g of 1,4-butanediol and After 445 g of ethylene carbonate, 0.0960 g of titanium tetra-n-butoxide was charged as a catalyst. The reactor was immersed in an oil bath at 140 to 160°C, and a part of the distillate was extracted, and the reaction was performed at a reaction temperature of 90 to 160°C for 20 hours. Next, the reactor was directly connected to the condenser, the temperature of the oil bath was raised to 180° C., the pressure was gradually lowered, and the reaction was further carried out for 8 hours to obtain a polycarbonate diol P- 2 (462 g). The hydroxyl value of the obtained polycarbonate diol P-2 was 55.8 mgKOH / g. In addition, the number average molecular weight of the obtained polycarbonate diol P-2 was 2010.

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Abstract

A polycarbonate diol composition containing a polycarbonate diol having a structure represented by general formula (I) and a polycarbonate structure represented by general formula (II), the polycarbonate diol composition having a melt viscosity at 50 DEG C of 1000-10000 mPa * s, and the average value of the number of repetitions (n11) in general formula (I) being 12 or more.

Description

technical field [0001] The present invention relates to polycarbonate diol compositions. Background technique [0002] Conventionally, polyurethane resins have been used in a wide range of fields such as synthetic leather, artificial leather, adhesives, furniture coatings, and automotive coatings. Among the raw materials of the polyurethane resin, polyether, polyester, and polycarbonate are used as the polyol component that reacts with the isocyanate. However, in recent years, there has been an increasing demand for the resistance of polyurethane resins such as heat resistance, weather resistance, hydrolysis resistance, solvent resistance, sunscreen resistance, and scratch resistance. [0003] According to Non-Patent Document 1, generally, as a polyol component, polyether polyol has a low viscosity. Therefore, although the polyurethane using polyether polyol is excellent in flexibility and hydrolysis resistance, it is inferior in heat resistance and weather resistance. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/44C08G18/48C08G64/30C08J5/18C09D175/04D06N3/14C08L75/04
CPCC08G18/44C08G18/4018C08G18/4825C08G18/4854C08G64/305D06N3/146C09D175/04C08J5/18C08J2375/04C08G18/7671C08G18/10C09D175/08C09D175/06C08G64/183D06N2211/28D06N2211/263C08G18/3206B32B5/02B32B7/12B32B27/12B32B27/40
Inventor 星野惠理子川合康文增渕徹夫
Owner ASAHI KASEI KK
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