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Process for producing rigid polyurethane slab foam, rigid polyurethane slab foam, and heat-insulating material for piping

A technology of rigid polyurethane and manufacturing method, which is applied in the fields of manufacture of rigid polyurethane sheet-like foam, rigid polyurethane sheet-like foam and thermal insulation materials for pipelines, can solve the problem of high thermal conductivity, inability to satisfy flame retardancy and dimensional stability It does not have problems such as thermal insulation effect and thermal insulation effect, and achieves the effects of low thermal conductivity, excellent dimensional stability, and excellent flame retardancy.

Inactive Publication Date: 2011-07-20
NIPPON POLYURETHANE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, the rigid polyurethane foams produced from the compositions disclosed in Patent Documents 1 to 5 all have high thermal conductivity and do not have sufficient heat insulating effect and heat retaining effect.
In addition, flame retardancy and dimensional stability cannot be satisfied

Method used

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  • Process for producing rigid polyurethane slab foam, rigid polyurethane slab foam, and heat-insulating material for piping
  • Process for producing rigid polyurethane slab foam, rigid polyurethane slab foam, and heat-insulating material for piping
  • Process for producing rigid polyurethane slab foam, rigid polyurethane slab foam, and heat-insulating material for piping

Examples

Experimental program
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Effect test

Embodiment

[0096] The embodiments of the present invention are described below, but the present invention is not limited to these embodiments. In addition, hereinafter, unless otherwise specified, "%" and "parts" respectively mean "mass%" and "parts by mass". In addition, the modifiers used in the following preparation examples are the following compounds.

[0097] (1) Specific modifier (d1): polyester polyol obtained by reacting diethylene glycol with phthalic acid (number of functional groups = 2, hydroxyl value = 270 mgKOH / g, number average molecular weight = 416). (2) Specific modifier (d2): polyester polyol obtained by reacting diethylene glycol with phthalic acid and adipic acid (number of functional groups=2, hydroxyl value=230mgKOH / g, number average molecular weight=488 ). (3) Specific modifier (d3): polyester polyol obtained by reacting diethylene glycol and phthalic acid (number of functional groups = 2, hydroxyl value = 255 mgKOH / g, number average molecular weight = 440).

[009...

preparation example 1

[0100] According to the formula shown in Table 1 below, put 32.4 parts of MDI(a1) (dinuclear body containing more than 70% of 4,4'-MDI) into the reaction vessel equipped with a stirrer, thermometer, cooler and nitrogen inlet pipe ), heated to 60°C, and then added 12.4 parts of the specific modifier (d1), and the system was stirred at 60°C for about 2 hours, thereby modifying the MDI. Next, 55.2 parts of polymerized MDI (a2) was added and mixed to the reaction product (modified MDI), thereby obtaining 100.0 parts of component [A] (hereinafter referred to as a modified polyisocyanate containing 25.4% of NCO content). As "ingredient [A-1]").

[0101] The obtained component [A-1] had no turbidity and was in a transparent liquid state, and its viscosity (25°C) was 1050 mPa·s. The ratio of the dinuclear body (unmodified MDI molecule) contained in the component [A-1] is 40%. In addition, the ratio of the dinuclear body in the total amount (87.6 parts) of the MDI (a1) used for the modi...

preparation example 2

[0103] According to the formula shown in Table 1 below, the input amount of MDI (a1) was changed to 36.3 parts, and the addition amount of the specific modifier (d1) was changed to 8.5 parts to modify the MDI. In addition, In the same manner as in Preparation Example 1, 100.0 parts of component [A] (hereinafter referred to as "component [A-2]") containing a modified polyisocyanate having an NCO content of 27.5% was obtained.

[0104] The obtained component [A-2] had no turbidity and was in a transparent liquid state, and its viscosity (25°C) was 284 mPa·s. The content of dinuclear bodies (unmodified MDI molecules) in this component [A-2] is 48%. In addition, the ratio of the dinuclear body in the total amount (91.5 parts) of the MDI (a1) used for the modification treatment and the polymeric MDI (a2) mixed after the modification was 64%.

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Abstract

The present invention provides a process for producing a rigid polyurethane slab foam which does not scorch inside, has a low thermal conductivity, retains excellent flame retardancy over long, and has excellent dimensional stability. A foam-forming composition comprising [A] a modified polyisocyanate which is obtained by modifying at least part of a polymeric MDI having an MDI content of 30-80 mass% with a modifier comprising a polyester polyol having a hydroxy value of 150-300 mg-KOH / g and which has an NCO content of 24.0-28.0%, [B] a polyol ingredient comprising at least 50 mass% at least one member selected among (B1) a polyether polyol made with toluenediamine as an initiator, (B2) a polyether polyol made with sorbitol as an initiator, and (B3) a polyether polyol made with sucrose asan initiator, and [C] a blowing agent comprising water is reacted to cause it to freely foam, with the top kept open.

Description

Technical field [0001] The present invention relates to a manufacturing method of rigid polyurethane slabfoam, a rigid polyurethane slabfoam and a heat insulating material for pipelines. More specifically, the present invention relates to a method for producing rigid polyurethane slab foam with no internal coking, low thermal conductivity, and excellent flame retardancy, the rigid polyurethane slab foam produced by the method, and the rigid polyurethane plate Heat-insulating material for pipelines obtained by cutting and processing of shaped foam. [0002] The rigid polyurethane slab foam of the present invention is not a slab foam that is foamed and molded into specific shapes such as various panels, boards, and refrigerators, nor is it a slab foam that is sprayed and foamed like in-situ foaming. It is a rigid "slab foam" prepared by freely foaming the composition injected into a mold with an open top, or freely foaming a composition continuously sprayed on a continuous line wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/10C08G101/00
CPCC08G2101/0025C08G18/7664C08G18/4238C08G2101/005C08L75/04C08G18/4275C08G2101/0083C08G18/10C08K5/521C08G18/4211C08G18/482C08G2110/0025C08G2110/005C08G2110/0083C08G18/48
Inventor 猪原英树
Owner NIPPON POLYURETHANE IND CO LTD
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