Polyurethane resin for synthetic leather and porous sheet material

A technology of polyurethane resin and synthetic leather, applied in textiles and papermaking, etc., can solve the problems of high crystallinity, poor low temperature characteristics and hard texture of polycarbonate diol

Inactive Publication Date: 2009-03-25
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] It is known in the prior art that as a polymer diol component of polyurethane resin for synthetic leather, when polycarbonate diol such as 1,6-hexanediol polycarbonate diol is used, although the hydrolysis resistance , Excellent weather resistance, but also has the disadvantages of hard texture and poor cold resistance, that is, low-temperature characteristics
[0003] The polycarbonate diol obtained from 1,6-hexanediol has high crystallinity, and the polyurethane soft segment component obtained from this polycarbonate diol crystallizes and damages elasticity, so the texture is hard or the low-temperature characteristics are deteriorated

Method used

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  • Polyurethane resin for synthetic leather and porous sheet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096]In a four-necked flask with a stirrer and a thermometer, add 3-methyl-pentanediol / 1,6-hexanediol (mole percent: 30 / 70) with a number average molecular weight of 2,000 (calculated from the hydroxyl value) to copolymerize Copolymerization of 60 parts of polycarbonate diol, 1,9-nonanediol / 2-methyl-1,8-octanediol (mole percent: 15 / 85) with a number average molecular weight of 2,000 (calculated from the hydroxyl value) 140 parts of polycarbonate diols, 12.7 parts of ethylene glycol (hereinafter referred to as EG), 77.5 parts of MDI and 677 parts of DMF were reacted at 70°C for 15 hours in a dry nitrogen atmosphere to obtain a resin concentration of 30%, a viscosity of It is a polyurethane resin (D-1) solution at 90,000 mPa s / 20°C and a solidification value of 3.3.

Embodiment 2

[0098] In the same reaction vessel as in Example 1, 3-methyl-pentanediol / 1,6-hexanediol (mole percent: 30 / 70) copolymerized with a number average molecular weight of 2,000 (calculated from the hydroxyl value) was added. Copolymerization of 100 parts of carbonate diol, 1,9-nonanediol / 2-methyl-1,8-octanediol (mole percent: 15 / 85) with a number average molecular weight of 2,000 (calculated from the hydroxyl value) 100 parts of carbonate diol, 15.2 parts of 1,4-butanediol (hereinafter referred to as 1,4-BG), 68.5 parts of MDI and 662 parts of DMF were reacted at 65°C for 20 hours in a dry nitrogen atmosphere to obtain A polyurethane resin (D-2) solution with a resin concentration of 30%, a viscosity of 85,000 mPa s / 20°C, and a solidification value of 4.3.

Embodiment 3

[0100] In the same reaction vessel as in Example 1, 3-methyl-pentanediol / 1,6-hexanediol (mole percent: 50 / 50) copolymerized with a number average molecular weight of 2,000 (calculated from the hydroxyl value) was added. Copolymerization of 1,9-nonanediol / 2-methyl-1,8-octanediol (mole percent: 15 / 85) with 80 parts of carbonate diol and a number average molecular weight of 2,000 (calculated from the hydroxyl value) 120 parts of carbonate diol, 19.2 parts of 1,4-BG, 79.8 parts of MDI and 698 parts of DMF were reacted at 65°C for 20 hours in a dry nitrogen atmosphere to obtain a resin with a concentration of 30% and a viscosity of 80,000mPa s / 20 ℃, solidification value of 3.8 polyurethane resin (D-3) solution.

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Abstract

A porous sheet material obtained through the wet coagulation of a polyurethane resin. The porous sheet is evenly microporous and has a highly flexible texture. The polyurethane resin for artificial leathers is characterized by being obtained by reacting high-molecular diols (A) comprising a polycarbonate diol (a1) obtained from a C4-6 alkanediol and a polycarbonate diol (a2) obtained from a C7-12 alkanediol, an organic diisocyanate (B), and a chain extender (C). It preferably is further characterized by having a coagulation value of 2 to 5.

Description

technical field [0001] The invention relates to a polyurethane resin for synthetic leather and a porous sheet-like material obtained by applying the polyurethane resin to a substrate and using a wet film-making method. Background technique [0002] It is known in the prior art that as a polymer diol component of polyurethane resin for synthetic leather, when polycarbonate diol such as 1,6-hexanediol polycarbonate diol is used, although the hydrolysis resistance , Excellent weather resistance, but also has the disadvantages of hard texture and poor cold resistance, that is, low-temperature characteristics. [0003] The polycarbonate diol obtained from 1,6-hexanediol has high crystallinity, and the polyurethane soft segment component obtained from this polycarbonate diol crystallizes and damages elasticity, so the texture is hard or the low-temperature characteristics deteriorate . [0004] As a technique for reducing the crystallization properties of polycarbonate diols, a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/44
CPCC08G18/44C08G18/00C08J5/18C08L75/04D06N3/12D06N3/14
Inventor 小林良夫小川裕之
Owner SANYO CHEM IND LTD
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