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Polycarbonate polyol and polyurethane

A polycarbonate and polyol technology, applied in the field of polycarbonate polyol and polyurethane, can solve the problems of insufficient mechanical strength, damage to the chemical resistance and softness of polycarbonate diol, and achieve good reactivity , Excellent stable productivity, and the effect of suppressing gelation problems

Active Publication Date: 2019-08-06
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in Patent Documents 1 and 2, since they are polycarbonate diols composed only of oxyalkylene glycol, the mechanical strength is insufficient, and in Patent Document 3, half an amount of The above other diol components, therefore, have the problem of impairing the chemical resistance and flexibility of the polycarbonate diol originally made of oxyalkylene glycol.

Method used

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  • Polycarbonate polyol and polyurethane
  • Polycarbonate polyol and polyurethane
  • Polycarbonate polyol and polyurethane

Examples

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Effect test

Embodiment

[0332] Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, unless the summary is exceeded, this invention is not limited to these Examples.

[0333] [Evaluation method]

[0334] The evaluation methods of polycarbonate polyols and polyurethanes obtained in the following examples and comparative examples are as follows.

[0335] [Evaluation of polycarbonate polyol]

[0336]

[0337] Dissolve polycarbonate polyol in CDCl 3 In, measured at 400MHz 1 H-NMR (AL-400 manufactured by JEOL Ltd.) identified phenoxy groups, diols, branched alcohols, and phenols from signal positions of each component, and calculated each content from integral values. The detection limit at this time is 100 ppm by weight of phenol with respect to the weight of the whole sample, and dihydroxy compounds such as the compound represented by the above formula (A) and the compound represented by the above formula (B) are 0.1% by weight. In...

Embodiment I－1

[0373] Put 786.1 g of diethylene glycol (DEG), 744.7 g of triethylene glycol (TEG), and trimethylolpropane into a 5 L glass detachable flask equipped with a stirrer, a distillate trap, and a pressure regulator. (TMP) 25.5 g, diphenyl carbonate (DPC) 2525.0 g, magnesium acetate tetrahydrate aqueous solution 6.3 mL (concentration: 8.4 g / L, magnesium acetate tetrahydrate: 53 mg), and nitrogen replacement was carried out. The internal temperature was raised to 160° C. with stirring, and the contents were heated and dissolved. Then, after reducing the pressure to 24 kPa over 2 minutes, reaction was performed for 90 minutes while removing phenol to the outside of the system. Next, the pressure was lowered to 9.3 kPa over 90 minutes, further lowered to 0.7 kPa over 30 minutes to continue the reaction, and then the temperature was raised to 170° C., while removing phenol and unreacted dihydroxy compound to the outside of the system. Hour reaction, obtain the composition containing po...

Embodiment I－2

[0377] Put 231.8 g of diethylene glycol (DEG), 219.6 g of triethylene glycol (TEG), and trimethylolpropane into a 1 L glass detachable flask equipped with a stirrer, a distillate trap, and a pressure regulator. (TMP) 7.5 g, diphenyl carbonate (DPC) 741.2 g, and magnesium acetate tetrahydrate aqueous solution 1.9 mL (concentration: 8.4 g / L) were replaced with nitrogen. The internal temperature was raised to 160° C. with stirring, and the contents were heated and dissolved. Then, after reducing the pressure to 24 kPa over 2 minutes, reaction was performed for 90 minutes while removing phenol to the outside of the system. Next, the pressure was lowered to 9.3 kPa over 90 minutes, further lowered to 0.7 kPa over 30 minutes to continue the reaction, and then the temperature was raised to 170° C. to remove phenol and unreacted dihydroxy compound to the outside of the system for 15 minutes. hour response. Then, 0.45 mL of an aqueous 0.85% phosphoric acid solution was added to deact...

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Abstract

The invention provides a polycarbonate polyol which serves as a starting material for a polyurethane that has an excellent balance among flexibility, mechanical strength and solvent resistance. A polycarbonate polyol which contains a structural unit derived from a polyhydric alcohol, while having a hydroxyl number of 20-450 mgKOH / g. The polyhydric alcohol contains a diol (A) that contains 70% by weight or more of a specific oxyalkylene glycol (A1), and a trivalent to hexavalent branched alcohol (B) having 3-12 carbon atoms. The structural unit derived from the branched alcohol (B) in the polycarbonate polyol is 0.005-5.0 mol% of the structural unit derived from the polyhydric alcohol. The proportion of a structural unit (X1) represented by formula (X1) in the structural unit derived from the branched alcohol (B) is 50 mol% or less.

Description

technical field [0001] The present invention relates to polycarbonate polyol which is a raw material of polyurethane excellent in balance of flexibility, mechanical strength, and solvent resistance, and polyurethane using the polycarbonate polyol. Background technique [0002] Polycarbonate diols are used as raw materials for the soft segment of polyurethane and thermoplastic elastomers, coatings, adhesives, etc., and are considered to be disadvantages of polyether polyols and polyester polyols in heat resistance and weather resistance , hydrolysis resistance, etc. are excellent, and are widely used as raw materials for imparting high durability. [0003] Among the polycarbonate diols, polycarbonate diols synthesized from 1,6-hexanediol are currently commercially available widely, but the polycarbonate diols have high crystallinity, so when made into polyurethane, There are problems in that the cohesion of the soft segment is high, and the softness at low temperature, elong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/02C08G18/44
CPCC08G18/44C08G64/02C08G18/3206C08G18/7671C08G18/6637C07C31/20C07C31/225C08L75/04
Inventor 日置优太金森芳和草野一直若林一树山下亮山中贵之
Owner MITSUBISHI CHEM CORP
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