Unlock instant, AI-driven research and patent intelligence for your innovation.

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

A technology of rigid polyurethane and a manufacturing method, which is applied to the manufacture of rigid polyurethane sheet foam, rigid polyurethane sheet foam and thermal insulation materials for pipelines, can solve the problem of high thermal conductivity, no thermal insulation effect and thermal insulation effect, Can not meet the problems of flame retardancy and dimensional stability, and achieve the effect of low thermal conductivity, excellent dimensional stability, and excellent flame retardancy

Inactive Publication Date: 2009-08-26
NIPPON POLYURETHANE IND CO LTD
View PDF5 Cites 4 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
Effect test

Embodiment

[0096] Examples of the present invention are described below, however, the present invention is not limited to these Examples. In addition, hereinafter, unless otherwise specified, "%" and "part" represent "mass%" and "mass part" respectively. In addition, modifiers used in the following preparation examples are the following compounds.

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

[0098] (4) Mod...

preparation example 1

[0100] According to the formula shown in the following table 1, in the reaction vessel that is provided with stirrer, thermometer, cooler and nitrogen inlet pipe, drop into the MDI (a1) of 32.4 parts (contain the dinuclear body of 4,4'-MDI more than 70%) ), heated to 60° C., then added 12.4 parts of specific modifier (d1), and stirred the system at 60° C. for about 2 hours, thereby modifying 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 "Ingredient [A-1]").

[0101] The obtained component [A-1] was a transparent liquid without turbidity, and its viscosity (25° C.) was 1050 mPa·s. The ratio of the dinuclear body (unmodified MDI molecule) contained in this component [A-1] was 40%. In addition, the ratio of the dinuclear body in the total amount (87.6 parts) of the MDI (a1) subjected to the modification treatment and the polymerized MDI (a2) mix...

preparation example 2

[0103] According to the formula shown in the following table 1, the input amount of MDI (a1) is changed to 36.3 parts, and the addition amount of specific modifier (d1) is changed to 8.5 parts to modify 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] was a transparent liquid without turbidity, and its viscosity (25° C.) was 284 mPa·s. The content ratio of the dinuclear body (unmodified MDI molecule) in this component [A-2] was 48%. In addition, the ratio of the dinuclear body in the total amount (91.5 parts) of the MDI (a1) subjected to the modification treatment and the polymerized MDI (a2) mixed after modification was 64%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
hydroxyl valueaaaaaaaaaa
hydroxyl valueaaaaaaaaaa
hydroxyl valueaaaaaaaaaa
Login to View More

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 as an 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 method for manufacturing rigid polyurethane slab foam, rigid polyurethane slab foam and heat insulating material for pipelines. More specifically, the present invention relates to a method for producing a rigid polyurethane slab foam that does not cause coking inside, has a low thermal conductivity, and is excellent in flame retardancy, the rigid polyurethane slab foam produced by the method, and the rigid polyurethane slab. Heat insulating materials for pipelines obtained by cutting and cutting foam. [0002] The rigid polyurethane slab foam of the present invention is not a slab foam that is foamed and shaped into specific shapes such as various panels, boards, and refrigerators, nor is it a slab foam that is sprayed and foamed as in-situ foaming, but It is a rigid "slab foam" prepared by free-foaming a composition injected into a mold with an open top, or by free-foaming a composition continuously sprayed onto a con...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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