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Polycarbonate diol and polyurethane using same

A technology of polycarbonate and polyurethane, applied in the field of polyurethane, can solve the problems of hard texture, limitation, poor chemical resistance, etc., and achieve the effect of excellent elastic recovery

Active Publication Date: 2015-09-02
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, polycarbonate diols widely available on the market today are polycarbonate diols synthesized mainly from 1,6-hexanediol. This substance has high crystallinity, so when it is made into polyurethane, there is a softness. The high cohesion of the chain segment, especially the problem of poor low temperature properties such as flexibility, elongation, bending or elastic recovery, limits its use
Furthermore, the artificial leather manufactured using this polyurethane as a raw material has poor chemical resistance and has a hard texture, and it is pointed out that the "hand feeling" is inferior to that of natural leather.

Method used

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  • Polycarbonate diol and polyurethane using same
  • Polycarbonate diol and polyurethane using same
  • Polycarbonate diol and polyurethane using same

Examples

Experimental program
Comparison scheme
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Embodiment

[0494] Examples and comparative examples are given below to explain the present invention more specifically, but as long as it does not exceed the gist of the present invention, it is not limited to these examples.

[0495] Hereinafter, the evaluation method of each physical property value is as follows.

[0496] [Evaluation method: polycarbonate diol]

[0497]

[0498] Dissolve polycarbonate diol in CDCl 3 , Measure 400MHz 1 H-NMR (AL-400 manufactured by JEOL Co., Ltd.) identifies phenoxy groups, dihydroxy compounds, and phenols based on the signal position of each component, and calculates the respective contents based on the integral value. At this time, the detection limit is 100 ppm as the weight of phenol relative to the weight of the entire 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 addition, the ratio of the phenoxy group was determined from the ratio o...

Embodiment 1-1

[0561]

[0562] In a 5L glass separable flask equipped with a stirrer, a distillate collector, and a pressure regulator, 1,4-butanediol (1,4BD): 768.5g, 1,10- Decanediol (1, 10DD): 768.5 g, diphenyl carbonate: 2563.0 g, magnesium acetate tetrahydrate aqueous solution: 6.6 mL (concentration: 8.4 g / L, magnesium acetate tetrahydrate: 55 mg), and replaced with nitrogen. Under stirring, the internal temperature was raised to 160°C, and the contents were dissolved by heating. Then, after the pressure was reduced to 24 kPa over 2 minutes, the phenol was removed from the system and allowed to react for 90 minutes. Next, the pressure was reduced to 9.3 kPa over 90 minutes, and further to 0.7 kPa over 30 minutes to continue the reaction, and then the temperature was raised to 170°C to remove the phenol and unreacted dihydroxy compound out of the system while reacting for 60 minutes. A composition containing polycarbonate diol is obtained.

[0563] The obtained polycarbonate diol-containi...

Embodiment 1-2～ Embodiment 1-13

[0572]

[0573] In the production of the polycarbonate diol of Example 1-1, all were carried out under the same conditions and methods except that the type and feed amount of the PCD polymerization raw materials were changed to those described in Table 1 The reaction yields a composition containing polycarbonate.

[0574] The obtained polycarbonate diol-containing composition was subjected to thin-film distillation in the same manner as in Example 1-1. Table 1 shows the evaluation results of properties and physical properties of the polycarbonate diol obtained by thin-film distillation.

[0575]

[0576] In the production of the polyurethane of Example 1-1, except that the type of polycarbonate diol (PCD) used and the feed amount of each raw material were changed to the PCD and the feed amount described in Table 3, all were the same. The conditions and methods are reacted to obtain a polyurethane solution. The properties and physical properties of the polyurethane are shown in Ta...

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Abstract

The present invention relates to: a polycarbonate diol which contains a structural unit derived from a compound represented by formula (A) and a structural unit derived from a compound represented by formula (B), and which has a hydroxyl number of 20-450 mg-KOH / g; and a polycarbonate diol which has a hydroxyl number of 20-45 mg-KOH / g and a glass transition temperature of -30°C or less as measured by a differential scanning calorimeter, and which provides, by hydrolysis, a dihydroxy compound that has an average number of carbon atoms of 3-5.5.

Description

Technical field [0001] The present invention relates to a polycarbonate diol useful as a raw material of a polycarbonate polyurethane and a polyurethane obtained using the polycarbonate diol. Background technique [0002] Conventionally, as a raw material for the main soft segment part of polyurethane resin produced on an industrial scale, it can be classified into ethers represented by polytetramethylene glycol, polyester polyols represented by adipate esters, and poly Polylactones represented by caprolactone or polycarbonates represented by polycarbonate diols (Non-Patent Document 1). [0003] Among them, ether-based polyurethanes are excellent in hydrolysis resistance, flexibility, and stretchability, but have poor heat resistance and weather resistance. On the other hand, polyurethanes using polyester polyols have improved heat resistance and weather resistance, but the ester group has low hydrolysis resistance and cannot be used in certain applications. [0004] On the other h...

Claims

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Application Information

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IPC IPC(8): C08G64/02C08G18/44C09D175/04C09J175/04D06M15/564D06N3/14
CPCC09J175/06C09D175/06C08G64/0208C09J175/04C08G18/44C08G64/305C08G64/02C08G2190/00C09D175/04D06N3/146C08G18/3206
Inventor 草野一直金森芳和中川阳子矢野香织
Owner MITSUBISHI RAYON CO LTD
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