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Manufacturing process of polyurethane foam sheet and layered sheet using the same

A manufacturing method, foam technology, applied in the direction of chemical instruments and methods, lamination, layered products, etc.

Active Publication Date: 2006-02-08
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The problem to be solved by the present invention is a production method that does not use an organic solvent harmful to human body and environmental problems, does not require an organic solvent drying process and an extraction process, and correspondingly reduces the energy consumption required for evaporating and removing the solvent, Provide polyurethane with excellent durability such as mechanical strength, hydrolysis resistance and heat resistance, which is easy to control the foam shape even in the case of a relatively thin foam sheet, has a uniform foam shape, is soft to the touch, has flexibility, and has excellent mechanical strength, hydrolysis resistance, and heat resistance Foam sheet and method for producing laminated sheet containing the polyurethane foam sheet

Method used

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  • Manufacturing process of polyurethane foam sheet and layered sheet using the same
  • Manufacturing process of polyurethane foam sheet and layered sheet using the same
  • Manufacturing process of polyurethane foam sheet and layered sheet using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0193] Production of foam sheet I

[0194] In a 1-liter four-necked flask, 70 parts of polytetramethylene glycol (hereinafter referred to as PTMG) with a number average molecular weight of 1300, and adipic acid (referred to as AA in Table 1) and hexanediol ( In Table 1, 30 parts of polyester polyols having a number average molecular weight of 2000 obtained by HG) reaction were heated under reduced pressure at 120° C., and dehydrated until the water content dropped to 0.05%. After cooling to 60°C, add 25 parts of 4,4'-diphenylmethane diisocyanate (MDI), heat up to 110°C, and react for 2 hours until the content of isocyanate groups is constant, thereby obtaining urethane prepolymer I.

[0195] The melt viscosity of the urethane prepolymer I at 125° C. was 8000 mPa·s, and the isocyanate group content was 2.1% by weight. Heat the urethane prepolymer I to 120° C. and mix and stir ethylene glycol (EG), N, N-dimethylcyclohexylamine (hereinafter referred to as DMCHA, Made by Aerodac...

Embodiment 2

[0199] Production of Foam Sheet II

[0200] The liquid mixture I obtained in Example 1 is directly introduced between the first release paper and the second release paper installed on the roller coater, and is coated into a sheet with a thickness of 100 μm, and then from the first release paper and the second release paper On both sides of the second release paper, water vapor spraying is carried out for 1 minute under the condition that the atmosphere temperature near the surface of the two release papers is 80° C. and the atmosphere humidity is 95%, and then in an environment with a temperature of 23° C. and a relative humidity of 65%. After standing for 1 day, foam sheet II was obtained.

[0201] Table 1 shows the properties evaluation results of the obtained foam sheet II. The foam sheet II had a degree of expansion of 2.5, good foamability, and excellent heat resistance and hydrolysis resistance. In addition, the stress immediately after processing is not destructive to...

Embodiment 3

[0203] Manufacture of Foam Sheet III

[0204] The liquid mixture I obtained in Example 1 is directly introduced between the first release paper and the second release paper mounted on a roller coater, coated into a thin sheet with a thickness of 300 μm, and then removed from the first release paper and the both sides of the second release paper, the atmosphere temperature near the surface of the two release papers is 80°C and the atmosphere humidity is 95% to carry out water vapor spraying for 1 minute, and then in the condition of 23°C in temperature and 65% relative humidity Leave it in the environment for 1 day to obtain foam sheet III.

[0205] Table 1 shows the properties evaluation results of the obtained foam sheet III. The foam sheet III had a degree of expansion of 2.5, good foamability, and excellent heat resistance and hydrolysis resistance. In addition, the stress immediately after processing is not destructive to the foam, which is a favorable result.

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Abstract

A method of producing a polyurethane foam sheet, and a laminated sheet that uses such a foam sheet, that can be applied to artificial leather, synthetic leather, and cushioning materials used in all manner of applications. A polyurethane foam sheet is produced by applying a liquid mixture, obtained by mixing together a heated and melted hot melt urethane prepolymer (A) containing isocyanate groups at molecular terminals, and a compound (B) containing at least 2 active hydrogen atom-containing groups, onto a substrate in a sheet-like manner, and then water foaming the liquid mixture by bringing the sheet-like liquid mixture into contact with water vapor or moisture (water). A laminated sheet is produced by bonding a third substrate to the polyurethane foam sheet.

Description

technical field [0001] The present invention relates to a method for producing polyurethane foam sheets such as artificial leather, synthetic leather, and cushioning materials, which can be applied to various uses, and laminate sheets using the same. [0002] In addition, this application is based on Japanese Patent Application No. 379816 in 2002, and the contents thereof are incorporated in the specification. Background technique [0003] Polyurethane foam sheets, especially so-called soft polyurethane as raw materials, have excellent flexibility, stretchability, and cushioning properties, so they can be used for clothing by combining them with various raw materials. , protective cover, bracket and other purposes. Conventionally, in the manufacture of this polyurethane foam sheet, chlorofluorocarbons (for example, CFC-11 or CFC-113) or low-boiling organic solvents such as methylene chloride have been used as blowing agents. Due to the harmfulness to the human body and env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B5/18B32B27/40C08G18/10B29C44/32B29C67/24B32B5/20B32B37/24C08G18/12C08G18/40
CPCC08G2101/0008C08G18/12B29C67/246B32B2038/0084C08G18/4018C08G2101/0083B32B37/24B32B5/18C08G2170/20B32B27/40B29C44/32B29C44/326B29C44/321C08G2110/0083C08G2110/0008C08G18/3203B32B7/06B32B2266/0278B32B27/065
Inventor 田所茂金川善典丹羽俊夫玉木淑文
Owner DIC CORP
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