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Polyurethane foam sheet, method for producing same, and method for producing laminate

A manufacturing method, polyurethane technology, applied in the direction of chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of hardening, peeling, sheet bubble damage, etc., and achieve the effect of excellent peel strength

Active Publication Date: 2019-02-05
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the polyurethane foam sheet is not cured to a certain extent at the stage of winding it on the roll, there is a problem that the foam in the sheet will be broken and become a hard sheet, or a problem may occur in the laminated body. In the case of wrinkles / distortion / peeling, etc.

Method used

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  • Polyurethane foam sheet, method for producing same, and method for producing laminate
  • Polyurethane foam sheet, method for producing same, and method for producing laminate

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0093] [Preparation Example 1] Preparation of main agent (i-1)

[0094] 100 parts by mass of 4,4'-diphenylmethane diisocyanate (hereinafter abbreviated as "MDI"), 120 parts by mass of polytetramethylene glycol ("PTMG2000" manufactured by Mitsubishi Chemical Corporation, number average molecular weight: 2,000) into a four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet, and a reflux condenser, and reacted at 80° C. for 3 hours to obtain NCO%: 12.9% by mass of the urethane prepolymer (A -1-1).

[0095] Next, 11.8 parts by mass of 2-hydroxyethyl acrylate (hereinafter, abbreviated as "HEA") was added and reacted at 60°C for 2 hours to obtain an acryloyl group introduced into 15 mol% of the remaining isocyanate groups. The obtained urethane prepolymer (Ai) was used as the main ingredient (i-1). The viscosity of the main ingredient (i-1) at 50°C was 1,550 mPa·s.

preparation example 2

[0096] [Preparation example 2] preparation of main agent (i-2)

[0097] Add 100 parts by mass of MDI and 107 parts by mass of PTMG2000 into a four-necked flask equipped with a thermometer, a stirrer, an inert gas inlet, and a reflux condenser, and react at 80°C for 3 hours to obtain NCO%: 14.2% by mass of amino Formate prepolymer (A-1-2).

[0098] Next, 16 parts by mass of HEA was added and reacted at 60° C. for 2 hours to obtain a urethane prepolymer (Aii) in which 20 mol % of the remaining isocyanate groups were introduced with acryloyl groups, which was obtained as Main ingredient (i-2). The viscosity of the main ingredient (i-2) at 50°C was 1,800 mPa·S.

preparation example 3

[0099] [Preparation Example 3] Preparation of main agent (i'-1)

[0100] Add 100 parts by mass of MDI and 150 parts by mass of PTMG2000 into a four-neck flask equipped with a thermometer, a stirrer, an inert gas inlet, and a reflux condenser, and react at 80°C for 3 hours to obtain NCO%: 11.2% by mass of amino Formate prepolymer (A'-1-1).

[0101] Next, 2.3 parts by mass of HEA was added and reacted at 60°C for 2 hours to obtain a urethane prepolymer (A'i) in which an acryloyl group was introduced into 3 mol% of the remaining isocyanate groups, This was used as the main ingredient (i'-1). The viscosity of the above-mentioned main ingredient (i'-1) at 50°C was 1,310 mPa·S.

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Abstract

The problem the invention is intended to solve is to provide a polyurethane foam sheet having excellent foam retentivity after sheet formation, feel, and peel strength. The invention provides a polyurethane foam sheet formed from a polyurethane composition containing a main agent (i) including a urethane prepolymer (A) having isocyanate groups and a curing agent (ii) including a polyol (B), wherein the polyurethane foam sheet is characterized in that the urethane prepolymer (A) has polymerizable unsaturated groups introduced into 5-25 mol% of the remaining isocyanate groups relative to the urethane prepolymer (A-1) having an isocyanate group content of 2-20 mass%. The invention also provides a method for producing a polyurethane foam sheet characterized in that the above polyurethane composition is foamed by a gas loading method or a water foaming method.

Description

technical field [0001] The present invention relates to a polyurethane foam sheet excellent in foam retention, touch, and peel strength after sheet formation. Background technique [0002] Polyurethane foam sheets are widely used in various fields such as automotive interior materials, shoe soles, rollers for copiers, cushioning materials, sealing materials, and electronic seals. As a method for producing a polyurethane foam sheet, for example, a method is disclosed in which a urethane acrylate oligomer is coated on a substrate, cured by ultraviolet rays, and then wound up for use (for example, refer to Patent Document 1). . [0003] As said polyurethane foam seat|seet, it is not used alone in many cases, but is used as the laminated body of different materials. Examples of the above-mentioned different materials include fibrous base materials such as nonwoven fabrics, woven fabrics, and knitted fabrics, and composite fiber base materials in which polyurethane or the like ...

Claims

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Application Information

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IPC IPC(8): C08G18/00B32B5/18B32B27/40C08F299/06C08G18/10C08G18/67C08G101/00
CPCB32B5/18B32B27/40C08G18/67C08F299/06C08G18/00C08G18/10
Inventor 樋口大地竹中雅美
Owner DAINIPPON INK & CHEM INC
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