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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, in order to prevent crystallization, the method of adding an appropriate organic solvent was adopted as a countermeasure, but in recent years, from the viewpoint of pollution prevention and economical rationality, it is strongly desired to improve crystallinity without using organic solvents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Add THF 281.4g (3.90mol), MTHF105.7g (1.23mol), acetic anhydride 7.6g (0.07mol), acetic acid 7.3g (0.12mol), and 20gNafion ( 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. 100 g of methanol and 1 g (25 mmol) of sodium hydroxide were added to the obtained residue, followed by heating to reflux, and reaction was performed for 4 hours while methanol and produced methyl acetate were distilled off.

[0084] After the reaction, 1.5 g (25 mmol) of acetic acid and 200 g of toluene were added, the organic layer was washed five 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) of the obtained polyol was 3,104, and th...

Embodiment 2

[0094] 79.2 g (25.5 mmol) of copolyether polyols and 10.2 g (40.8 mmol) of 4,4'-diphenylmethane diisocyanate (MDI) obtained in Example 1 were dropped into a reaction vessel equipped with a stirrer, a thermometer, and a nitrogen seal tube. mmol), the prepolymerization reaction was carried out at 60° C. for 5 hours. Thereafter, 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 together at 25° C., and stirred for 30 Minutes to obtain a polyurethane solution.

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PUM

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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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