Foam sheet and synthetic leather

A foamed sheet and compound technology, applied in coating, textile and papermaking, etc., can solve the problems of poor smoothness, difficulty in controlling the size and amount of bubbles, hardening of the hand feeling, etc., and achieve the effect of excellent hand feeling and peel strength.

Pending Publication Date: 2022-04-15
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the former method, the problem of poor smoothness caused by hard texture or swelling of the microcapsules, and in the latter method, when the urethane resin aqueous dispersion is dried, air bubbles in the compounding liquid Combine and disappear, so it is extremely difficult to control the size and amount of bubbles

Method used

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  • Foam sheet and synthetic leather
  • Foam sheet and synthetic leather
  • Foam sheet and synthetic leather

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0073] In the presence of 0.1 parts by mass of stannous octoate, polyether polyol ("PTMG2000" manufactured by Mitsubishi Chemical Corporation, number average molecular weight: 2000, hereinafter abbreviated as "PTMG2000") 1000 parts by mass, 2,2-di 24 parts by mass of methylolpropionic acid (hereinafter abbreviated as "DMPA") and 262 parts by mass of dicyclohexylmethane diisocyanate (hereinafter abbreviated as "HMDI") were reacted at 100°C until NCO% reached 2.1 % by mass to obtain urethane prepolymer A1.

[0074] A1 and triethylamine heated to 70°C, a 20% by mass aqueous solution of sodium dodecylbenzenesulfonate as an emulsifier ("NEOGEN S-20F" manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), and water were simultaneously supplied to the twin-screw An emulsion was obtained by mixing with an extruder (TEM-18SS: manufactured by Toshiba Machinery). The respective flow rates of the feed solutions were A1: 10 kg / hour, triethylamine: 0.2 kg / hour, emulsifier aqueous solutio...

Synthetic example 2

[0077] In the presence of 0.1 parts by mass of stannous octoate, 1000 parts by mass of PTMG2000, 24 parts by mass of DMPA and 262 parts by mass of HMDI were reacted at 100° C. until the NCO% reached 2.1 mass % to obtain a prepolymerized carbamate Object A2.

[0078] A2 and triethylamine heated to 70° C., polypropylene polyethylene copolymer ("Pluronic L-64" manufactured by ADEKA Co., Ltd.) as an emulsifier, and water were simultaneously supplied to a twin-screw extruder (TEM-18SS: Toshiba machine) and mixed to obtain an emulsion. The respective flow rates of the feed solutions were A2: 10 kg / hour, triethylamine: 0.2 kg / hour, L-64: 0.5 kg / hour, water: 7.1 kg / hour, and the operating conditions of the twin-screw extruder were 50° C. and 260 rpm.

[0079] Immediately thereafter, a water dilution of IPDA having an amino group content of 95% of the NCO group was added to extend the chain, and finally a polyurethane emulsion (X-2) having a urethane resin content of 50% by mass was o...

Synthetic example 3

[0081] In the presence of 0.1 parts by mass of stannous octoate, 1000 parts by mass of PTMG2000, 24 parts by mass of DMPA and 262 parts by mass of HMDI were reacted at 100°C until the NCO% reached 2.1% by mass to obtain a prepolymerized carbamate Object A3.

[0082] A3 heated to 70° C., triethylamine, and water were simultaneously supplied to a twin-screw extruder (TEM-18SS: manufactured by Toshiba Machinery) and mixed to obtain an emulsion. The respective flow rates of the feed liquids were A3: 10 kg / hour, triethylamine: 0.2 kg / hour, water: 6.6 kg / hour, and the operating conditions of the twin-screw extruder were 50° C. and 260 rpm.

[0083] Immediately thereafter, a water dilution of IPDA having an amino group content of 95% of the NCO group was added to extend the chain to finally obtain a polyurethane emulsion (X-3) having a urethane resin content of 50% by mass.

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Abstract

The present invention addresses the problem of providing a foam sheet having excellent foam retention, texture, and peel strength. The present invention provides a foam sheet which is formed from an aqueous dispersion of a urethane resin (X), and which is characterized in that the content of the urethane resin (X) in the aqueous dispersion is 50-80 mass%, and the aqueous dispersion does not contain an organic solvent. Furthermore, the present invention provides a synthetic leather characterized by having at least a base material (i) and a polyurethane layer (ii), the polyurethane layer (ii) being formed from the foam sheet. The density of the foam sheet is preferably 200 to 1000 kg / m < 3 >.

Description

technical field [0001] The present invention relates to foam sheet and synthetic leather. Background technique [0002] Urethane resins are widely used in the manufacture of synthetic leather (including artificial leather), coating agents, adhesives, gloves, clothing, etc. due to their mechanical strength and good feel. Among the above urethane resins, solvent-based urethane resins containing N,N-dimethylformamide (DMF) have hitherto been the mainstream. However, in the context of DMF regulations in Europe, strengthening of VOC emission regulations in China, and DMF regulations of major apparel manufacturers, environmental harmonization measures based on weak solvents, water-based systems, and solvent-free solutions are required. [0003] Under such circumstances, urethane resin aqueous dispersions (polyurethane dispersions) obtained by dispersing urethane resins in water have come to be used for the above-mentioned applications. However, the above-mentioned aqueous uretha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08J9/30C08G18/66C08G18/48C08G18/34C08G18/12C08G18/32D06N3/00D06N3/14
CPCD06N3/14C08J9/30C08G18/348C08G18/758C08G18/3234C08G18/12C08G18/4833C08G18/4808C08G18/244C08G18/3228C08G2110/0066C08J2375/08D06N3/0047D06N3/0088D06N3/0097D06N3/0095C08G18/0823C08G18/0895C08G18/4837C08G18/4854C08G18/6692C08G18/10C08G2110/0008C08G18/283C08G18/0866C08J9/365
Inventor 上口美和铁井智博
Owner DIC CORP
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