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Method for manufacturing hard polyurethane slabby foam and heat-insulating material for piping

A technology of rigid polyurethane and manufacturing method, applied in pipeline protection, heat exchange equipment, building construction, etc., can solve the problem of high thermal conductivity, achieve low thermal conductivity, good flame retardancy, flame retardancy and size good stability

Inactive Publication Date: 2006-10-04
NIPPON POLYURETHANE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In addition, none of the rigid polyurethane foams produced using the compositions disclosed in Patent Documents 1 to 5 are foams with high thermal conductivity and sufficient heat-insulating and heat-retaining effects.
It is not a foam that satisfies flame retardancy and dimensional stability, etc.

Method used

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  • Method for manufacturing hard polyurethane slabby foam and heat-insulating material for piping
  • Method for manufacturing hard polyurethane slabby foam and heat-insulating material for piping

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0133] In the reaction vessel equipped with stirrer, thermometer, cooler and nitrogen inlet pipe, according to the formula shown in the following table 1, add MDI (a1) (containing 4,4'-MDI dinuclear in the proportion of more than 70%) Body) 48 parts, after heating to 60°C, add 8 parts of specific modifier (d1) composed of polypropylene glycol with average molecular weight = 200, hydroxyl value = 561mg KOH / g, and stir the system at 60°C for about After 2 hours, modify the MDI.

[0134] Then, by adding 44 parts of mixed polymerization type MDI (a2) to this reaction product "modified MDI", the [A] component (hereinafter referred to as "[A- 1] Ingredients") 100 parts.

[0135] The viscosity (25° C.) of the component [A-1] was 500 mPa·s, and the ratio of dinuclear bodies (unmodified MDI molecules) contained in the component [A-1] was 44%.

[0136] Also, the ratio of the dinuclear body to the total amount (92 parts) of the modified MDI (a1) and the polymerized MDI (a2) mixed after...

preparation example 2

[0138] According to the formula shown in the following table 1, the addition of MDI (a1) is changed to 37 parts; add the specific modifying agent (d1) that is formed by the polypropylene glycol of average molecular weight=200, hydroxyl value=561mg KOH / g 3.4 parts, and 4.6 parts of specific modifying agent (d2) made of polypropylene glycol of average molecular weight=400, hydroxyl value=281mg KOH / g, MDI is carried out modification treatment; Except the addition of polymerization type MDI (a2) Except changing the amount to 55 parts, 100 parts of [A] component (hereinafter referred to as "[A-2] component") composed of modified polyisocyanate having an NCO content of 27.0% were obtained in the same manner as in Preparation Example 1.

[0139] The viscosity (25° C.) of the component [A-2] was 300 mPa·s, and the content ratio of dinuclear bodies (unmodified MDI molecules) in the component [A-2] was 44%.

[0140] Also, the ratio of the dinuclear body to the total amount (92 parts) of...

preparation example 3

[0142] According to the formula in the following table 1, the addition of MDI (a1) is changed to 37 parts; add 3 functional polyether polyols (average molecular weight = 600, hydroxyl value = 281mg KOH) made by the addition of propylene oxide and glycerin 8 parts of specific modifying agent (d3) that / g) constitutes, carry out modification treatment to MDI; Except that the addition amount of polymerization type MDI (a2) is changed into 55 parts, make the same preparation example 1 by NCO 100 parts of [A] component (hereinafter referred to as "[A-3] component") composed of modified polyisocyanate having a content of 27.0%.

[0143] The viscosity (25° C.) of the component [A-3] was 330 mPa·s, and the content ratio of dinuclear bodies (unmodified MDI molecules) in the component [A-3] was 49%.

[0144] Also, the ratio of the dinuclear body to the total amount (92 parts) of the modified MDI (a1) and the polymerized MDI (a2) mixed after modification was 64.1%.

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Abstract

The present invention provides a method for producing a rigid polyurethane slab foam having low heat conductivity and excellent incombustibility without generating scorch inside.(A) A modified polyisocyanate having NCO content of 25-28% which is obtained by modifying at least a part of polymeric diphenylmethane diisocyanate (MDI) containing MDI in a ratio of 30-80 mass% using a modifier comprising a polyether polyol with 2-4 functional groups and a hydroxy value of 100-900 mgKOH / g, (B) a polyol component containing a polyether polyol (B1) in a ratio of 50 mass% or more which is obtained by adding ethylene oxide and / or propylene oxide to toluenediamine, and (C) a foam forming composition containing a foaming agent comprising water are reacted.

Description

technical field [0001] The present invention relates to a method for producing a rigid polyurethane slab foam and a heat insulating material for piping, and more specifically, to a method for producing a rigid polyurethane slab foam that does not cause scorching inside, has low thermal conductivity, and has good flame retardancy. A heat insulating material for piping obtained by cutting the rigid polyurethane slab foam obtained by the above-mentioned production method. [0002] The rigid polyurethane slab foam obtained by the present invention is not foamed into specific shapes such as various plates, plates, and refrigerators, nor is it sprayed and foamed as on-site foaming, but is injected into the top (Top surface) Free-foaming composition in an open mold, or rigid "slab foam" produced by free-foaming composition discharged continuously onto a continuous line with an open top. Background technique [0003] Conventionally, chlorofluorocarbons or hydrofluorocarbons have be...

Claims

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Application Information

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IPC IPC(8): C08G18/79C08G18/48F16L59/12C08G101/00
CPCC08G18/5033C08G18/703C08J9/125C08J2375/04C08L75/04E04C2/205
Inventor 猪原英树笹原俊昭
Owner NIPPON POLYURETHANE IND CO LTD
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