Process for producing porous structure, artificial leather, and synthetic leather

A manufacturing method and structure technology, which are applied in textiles, papermaking, fiber processing, etc., can solve the problems of difficulty in obtaining porous structures stably, and achieve the effects of simple method, excellent strength and excellent stability.

Active Publication Date: 2006-11-29
NICCA CHEM COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to obtain a porous structure stably by either method

Method used

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  • Process for producing porous structure, artificial leather, and synthetic leather
  • Process for producing porous structure, artificial leather, and synthetic leather
  • Process for producing porous structure, artificial leather, and synthetic leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0052] Hereinafter, the present invention will be described in more detail with examples, but the present invention is not limited in any way by these examples.

[0053] In addition, in the examples and comparative examples, the porous structure was evaluated by the following method.

[0054] (1) Porous structure

[0055] A scanning electron microscope [Hitachi, Ltd., S-2400] was used to observe the cross section.

[0056] ○: It is found that a dense porous structure is formed.

[0057] △: It is found that a porous structure is partially formed.

[0058] ×: The formation of a porous structure is not observed.

[0059] (2) Tear strength

[0060] Measured according to JIS L19065.4. (C) pendulum method.

[0061] (3) Feel

[0062] According to the sense of touch, the evaluation is divided into 5 levels from level 1 (rough and hard) to level 5 (soft).

[0063]In addition, in Synthesis Examples 1-7, Synthesis Example 9 and Comparative Synthesis Example 4, the viscosity was measured with...

Synthetic example 1

[0064] Synthesis Example 1 (Waterborne Polyurethane Water Dispersion)

[0065] In a four-necked flask equipped with a stirrer, a reflux cooling tube, a thermometer and a nitrogen introduction tube, 75.9 g of poly 1,4-butanediol (average molecular weight 1,000) and 19.0 g of polyoxyethylene polyoxypropylene random copolymer glycol were added (The average molecular weight is 1,000, and the oxyethylene content is 70% by mass), 2.5g of trimethylolpropane, 0.001g of dibutyltin dilaurate and 60g of methyl ethyl ketone. After uniformly mixing, 42.6g of dicyclohexylmethane diisocyanate is added. The reaction was carried out at 75°C for 300 minutes to obtain a methyl ethyl ketone solution of a urethane prepolymer having a free isocyanate group relative to the solid content of 1.7% by mass. After the solution was cooled to 30°C, 0.1 g of dodecyl phosphate and 6.0 g of polyoxyethylene tristyryl phenyl ether (HLB15) were added, mixed uniformly, and 260 g of water was slowly added to emulsify ...

Synthetic example 2

[0066] Synthesis Example 2 (Waterborne Polyurethane Water Dispersion)

[0067] In the same reaction device as in Synthesis Example 1, 74.5 g of poly 1,4-butanediol (average molecular weight 1,000), 17.2 g of polyoxyethylene polyoxypropylene random copolymer glycol (average molecular weight 1,000, oxyethylene content 70% by mass), 1.3g of 1,4-butanediol, 1.9g of trimethylolpropane, 0.001g of dibutyltin dilaurate and 60g of methyl ethyl ketone, after uniformly mixing, add 45.1g of dicyclohexylmethane diisocyanate The reaction was carried out at 75°C for 300 minutes to obtain a methyl ethyl ketone solution of a urethane prepolymer with a free isocyanate group relative to the solid content of 1.9% by mass. After the solution was cooled to 30°C, 0.1 g of lauryl phosphate and 6.0 g of polyoxyethylene tristyryl phenyl ether (HLB15) were added, mixed uniformly, and 260 g of water was slowly added to emulsify phase transfer and dispersion. Then, a polyamine aqueous solution in which 5.6 g ...

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Abstract

A process for producing a porous structure which comprises: applying to a substrate a liquid mixture comprising (A) an aqueous dispersion of a water-compatible polyurethane, (B) an aqueous dispersion of a urethane prepolymer which has, in the molecular skeleton, 10 to 40% by mass structural unit comprising a polyoxyethylene group having an average molecular weight of 100 to 2,000 and which has been terminated by a blocked isocyanate, and (C) a tertiary amine; and subsequently subjecting the mixture to dry-heat drying or to wet-heat heating and then drying. Also provided are an artificial leather and synthetic leather obtained by the process. By the process, a porous structure having performances comparable to those of porous structures produced by a wet process from a solvent-based polyurethane can be obtained using an aqueous dispersion of a water-compatible polyurethane without using an organic solvent.

Description

Technical field [0001] The present invention relates to a method of manufacturing a porous structure, artificial leather and synthetic leather. In more detail, the present invention relates to a method of manufacturing a porous structure and the artificial leather and synthetic leather obtained by the method, wherein the method of manufacturing the porous structure is: using water-based polyurethane instead of organic solvents. The performance of the porous structure is not inferior to that of the porous structure manufactured using wet solvent polyurethane. Background technique [0002] So far, many kinds of leather products such as imitation leather, synthetic leather and artificial leather have been manufactured as substitutes for natural leather. In order to make the feel and air permeability close to natural leather, the product mainly forms a porous structure inside or on the base material such as woven fabric, knitted fabric, and non-woven fabric. As a method of manufactur...

Claims

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Application Information

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IPC IPC(8): D06N3/14C08G18/10C08G18/18C08G18/48C08G18/65C08G18/80D06M15/564
CPCC08G18/10D06N3/14C08G18/4833C08G2101/00
Inventor 鬼束优香西野正和齐藤一
Owner NICCA CHEM COMPANY
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