Copolyether polyol, polyurethane and method for producing copolyether polyol

A technology of ether polyol and acetic acid, which is applied in the field of copolyether polyol to achieve excellent elastic recovery

Active Publication Date: 2019-09-27
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, PTMG is a substance with a molecular weight of 500 to 4,000 that is generally used as a component of polyurethane, and its melting point is in the range of 20 to 40°C, and it crystallizes at room temperature or below. There are problems in sex and workability
In the past, i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0081]

[0082] Add 281.4 g (3.90 mol) of THF, 105.7 g (1.23 mol) of MTHF, 7.6 g (0.07 mol) of acetic anhydride, 7.3 g (0.12 mol) of acetic acid, and 20 g of Nafion ( Registered trademark) NR50, stirred at 23°C for 29 hours.

[0083] After the reaction, Nafion (registered trademark) NR50 was filtered off, and concentrated under reduced pressure to distill off unreacted monomers, acetic acid, and acetic anhydride. To the obtained residue, 100 g of methanol and 1 g (25 mmol) of sodium hydroxide were added, and the mixture was heated to reflux, and while distilling off methanol and the produced methyl acetate, the reaction was carried out for 4 hours.

[0084] After the reaction, 1.5 g (25 mmol) of acetic acid and 200 g of toluene were added, the organic layer was washed 5 times with 50 g of distilled water, and the organic layer was concentrated under reduced pressure to obtain 120.7 g of copolyether polyol.

[0085] According to GPC analysis, the number average molecular weight (Mn) ...

Example Embodiment

[0093]

[0094] Into a reaction vessel equipped with a stirrer, a thermometer, and a nitrogen sealed tube, 79.2 g (25.5 mmol) of the copolymer polyether polyol obtained in Example 1 and 10.2 g (40.8 of 4,4'-diphenylmethane diisocyanate (MDI) mmol), the prepolymerization reaction was carried out at 60°C for 5 hours. Then, 100 g of dimethylacetamide (DMAc) was added, and a DMAc (52 g) solution of 0.14 g (1.9 mmol) of diethylamine and 0.86 g (14.3 mmol) of ethylenediamine was added at 25° C., and stirred for 30 Minutes, a polyurethane solution is obtained.

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Abstract

The present invention relates to: a copolyether polyol which contains a monomer unit derived from tetrahydrofuran and a monomer unit derived from an alkyl tetrahydrofuran, and which has a terminal hydroxyl group purity of 97.0% to 100.0% and a molecular weight distribution (Mw/Mn) of 1.05 to 2.5; a polyurethane which contains a unit derived from the copolyether polyol; and a method for producing the copolyether polyol.

Description

technical field [0001] The present invention relates to a copolyether polyol, a polyurethane containing a unit derived from the copolyether polyol, and a method for producing the copolyether polyol. Background technique [0002] Polyether polyols are often used as soft segment components of polyurethanes. Among them, polyurethane resins obtained by using polytetramethylene ether glycol (PTMG) which is a tetrahydrofuran (THF) polymer are excellent in elastic properties, low-temperature properties, hydrolysis resistance, and the like, and thus attract attention. [0003] However, PTMG is a substance with a molecular weight of 500 to 4,000 that is generally used as a component of polyurethane, and its melting point is in the range of 20 to 40°C, and it crystallizes at room temperature or below. There are problems in terms of stability and workability. Conventionally, in order to prevent crystallization, a method of adding an appropriate organic solvent has been adopted as a c...

Claims

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Application Information

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IPC IPC(8): C08G65/20C08G18/48
CPCC08G18/48C08G65/20
Inventor 竹田明展千田浩介
Owner KURARAY CO LTD
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