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Leather-like sheet and method for producing same

A leather-like sheet and skin layer technology, applied in chemical instruments and methods, textiles and papermaking, adhesive types, etc., can solve problems such as peeling, poor appearance of leather-like sheets, skin layer swelling, etc.

Active Publication Date: 2014-04-30
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the skin layer used in the manufacture of the above-mentioned fiber laminate is exposed to sweat, oil components, etc. for a long time, swelling (swelling) or cracking of the skin layer and significant reduction in adhesive strength may sometimes occur. Therefore, poor appearance of the leather-like sheet and time-dependent peeling from the support may sometimes be caused.

Method used

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  • Leather-like sheet and method for producing same
  • Leather-like sheet and method for producing same
  • Leather-like sheet and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0101] [Preparation Example 1] Preparation of Adhesive (d1-1)

[0102] In the presence of 1221 g of methyl ethyl ketone and 0.1 g of stannous octoate, 1000 g of polycarbonate diol (NIPPOLAN N980R; Japan Polyurethane Industry Co., Ltd.: number average molecular weight 2000), 34 g of dimethylol propionic acid and dicyclohexylmethane 187 g of isocyanate (HMDI) was reacted at 70 degreeC until the isocyanate group disappeared, and the methyl ethyl ketone solution of the polyurethane resin which has a hydroxyl group at the terminal was obtained.

[0103] After mixing 2462 g of the methyl ethyl ketone solution of the polyurethane resin and 25 g of triethylamine, it was mixed with 2442 g of pure water and phase inversion emulsified to obtain an emulsion.

[0104] Next, methyl ethyl ketone was distilled off from the emulsion to obtain a polyurethane resin composition [d1-1-1] having a nonvolatile content of 45% by mass.

[0105] Add 100g of the polyurethane resin composition [d1-1-1] ...

preparation example 2

[0106] [Preparation Example 2] Preparation of Adhesive (d12)

[0107] In the presence of a nitrogen atmosphere and 0.1 g of stannous octoate, 100 g of polycarbonate diol (NIPPOLAN N980R; Nippon Polyurethane Industry Co., Ltd.: number average molecular weight 2000) heated to 80°C and dicyclohexylmethane diisocyanate (HMDI ) 14 g was stirred at 2000 rpm for 2 minutes using a mechanical mixer, and then defoamed using a vacuum defoamer to obtain a solvent-free adhesive (d1-2).

Embodiment 1

[0108] [Example 1] Production of leather-like sheet

[0109] In the presence of 710 g of methyl ethyl ketone and 0.1 g of stannous octoate, 1000 g of polycarbonate diol (NIPPOLAN N981; Nippon Polyurethane Industry Co., Ltd.: number average molecular weight 1000), 67 g of dimethylol propionic acid and dicyclohexylmethane 590 g of isocyanate (HMDI) was reacted at 70 degreeC until NCO% became 2.7 mass %, and the methyl ethyl ketone solution of the terminal isocyanate group containing urethane prepolymer (A'-1) was obtained by this. In addition, said NCO% is the ratio of the mass of the isocyanate group which the polyisocyanate has with respect to the gross mass of the raw material used for manufacture of the said polyurethane among them.

[0110] After mixing 2367 g of the methyl ethyl ketone solution of the above-mentioned terminal isocyanate group-containing urethane prepolymer (A'-1) and 50 g of triethylamine, it was mixed with 2367 g of pure water and phase inversion emulsifi...

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Abstract

The present invention addresses the problem of providing a urethane resin composition for forming a surface skin layer of a leather-like sheet, said urethane resin composition enabling the formation of the surface skin layer which has an excellent durability, such as perspiration resistance and oil resistance, at such a level that the leather-like sheet shows neither deterioration in appearance nor peeling from a substrate over time even in the case where, for example, sweat, oil or the like sticks thereto. The leather-like sheet according to the present invention is characterized by comprising: a surface skin layer (C) formed by using a urethane resin composition comprising a urethane resin (A) that has two or more hydroxyl groups at least at one end thereof, and an aqueous medium (B); an adhesive layer (D); and a substrate layer (E).

Description

technical field [0001] The present invention relates to leather-like sheets such as synthetic leather and artificial leather. Background technique [0002] Leather-like sheets such as synthetic leather and artificial leather are used in various fields such as clothing, furniture, vehicle interior materials, shoes, bags, etc. because they have an excellent feel comparable to natural leather. [0003] As the above-mentioned leather-like sheet, generally, an intermediate layer such as a porous layer is laminated on the surface of a support such as a fibrous substrate as necessary, and a skin layer made of polyurethane resin or the like is laminated on the surface. , for each layer, requires its own characteristics. Specifically, the intermediate layer is required to have a soft feel, and the skin layer is often required to have durability such as sweat resistance and oil resistance in addition to the aforementioned flexibility. [0004] In particular, durability such as persp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/14C08G18/44C09D5/02C09D175/04C09J11/04C09J175/04
CPCC09J175/04C09J11/04D06N2211/28C08G18/12C08G18/0823C08G18/44D06N3/14C08G18/348C08G18/6659C09D5/02C08G18/758C09D175/04D06N2209/145B32B5/022B32B7/12B32B27/12B32B27/40B32B2262/0261B32B2262/0276B32B2262/0292B32B2262/062B32B2437/02B32B2479/00B32B2605/003Y10T428/31551Y10T428/31554C08G18/3275C08G18/305C08G18/3228
Inventor 铁井智博后藤直孝
Owner DIC CORP
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