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CA2431668A1 - Syntactic foams with improved water resistance, long pot life and short demolding times - Google Patents

Syntactic foams with improved water resistance, long pot life and short demolding times

Info

Publication number
CA2431668A1
CA2431668A1 CA 2431668 CA2431668A CA2431668A1 CA 2431668 A1 CA2431668 A1 CA 2431668A1 CA 2431668 CA2431668 CA 2431668 CA 2431668 A CA2431668 A CA 2431668A CA 2431668 A1 CA2431668 A1 CA 2431668A1
Authority
CA
Grant status
Application
Patent type
Prior art keywords
weight
diisocyanate
diphenylmethane
polyether
comprises
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2431668
Other languages
French (fr)
Other versions
CA2431668C (en )
Inventor
Peter H. Markusch
Ralf Guether
Thomas L. Sekelik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Covestro LLC
Original Assignee
Covestro LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/32Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40High-molecular-weight compounds
    • C08G18/48Polyethers
    • C08G18/4804Two or more polyethers of different physical or chemical nature
    • C08G18/482Mixtures of polyethers containing at least one polyether containing nitrogen
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72Polyisocyanates or polyisothiocyanates
    • C08G18/74Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72Polyisocyanates or polyisothiocyanates
    • C08G18/77Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
    • C08G18/78Nitrogen
    • C08G18/7806Nitrogen containing -N-C=0 groups
    • C08G18/7818Nitrogen containing -N-C=0 groups containing ureum or ureum derivative groups
    • C08G18/7837Nitrogen containing -N-C=0 groups containing ureum or ureum derivative groups containing allophanate groups
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2101/00Foams
    • C08G2101/0025Foams rigid
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2330/00Thermal insulation material
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2375/00Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04Polyurethanes
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31551Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
    • Y10T428/31605Next to free metal

Abstract

This invention relates to syntactic foams comprising the reaction product of a liquid diphenylmethane diisocyanate component, with an isocyanate-reactive component, a filler having a density of less than 1 g/cm 3, and at least one organo-metallic catalyst. This invention also relates to the use of these syntactic foams for insulating pipes.

Claims (18)

1. A syntactic foam comprising the reaction product of:
(1) a liquid diphenylmethane diisocyanate having an NCO group content of from about 10 to about 33.6%
and a viscosity from about 10 to about 5,000 mPa.cndot.s @ 25°C, with (2) an isocyanate-reactive component comprising:
(a) at least 10% by weight of one or more polyether polyols having a functionality of 2 to 4, a molecular weight of 200 to 8,000 , and a hydroxyl number of 14 to 1,120, wherein at least one amine group is present in the starter for said polyether polyol, and the starter being alkoxylated by 100% by weight of propylene oxide;
(b) at least 20% by weight of one or more low unsaturation polyether polyols having an OH
functionality of about 2, a molecular weight of 250 to 8,000, and a hydroxyl number of 14 to 448, wherein the starter for said low unsaturation polyether polyol comprises water or an organic component containing two hydroxyl groups, and the starter being alkoxylated with 100% by weight of propylene oxide;
(c) at least 20% by weight of one or more polyether polyols having an OH functionality of about 3 to 6, a molecular weight of about 400 to about 3,000, and an hydroxyl number of about 56 to about 840, wherein the starter for said polyether polyol comprises an organic compound containing at least three hydroxyl groups, and the starter being alkoxylated with 100% by weight of propylene oxide;
and, optionally, (d) up to 10% by weight of one or more low molecular weight diols and/or triols having an equivalent weight of from 31 to 99;
wherein the %'s by weight of (2)(a), (2)(b), (2)(c) and (2)(d) totals 100% by weight of component (2);
(3) from 10 to 70% by weight, based on the combined weight of components (1), (2) and (3), of a filler having a density of less than 1 g/cm3;
and (4) at least one organo-metallic catalyst in the amount of about 0.001 to about 1% by weight, based on 100%
by weight of (2);
wherein the relative amounts of components (1) and (2) are such that the isocyanate index is from about 90 to about 120.
2. The syntactic foam of Claim 1, wherein (1) said liquid diphenylmethane diisocyanate comprises up to 70% by weight of 2,4'-diphenylmethane diisocyanate, no more than 2% by weight of 2,2'-diphenylmethane diisocyanate, and the balance being 4,4'-diphenylmethane diisocyanate, such that the sum of the 2,4'-MDI, the 2,2'-MDI and the 4,4'-MDI totals 100% by weight of the liquid diphenylmethane diisocyanate.
3. The syntactic foam of Claim 2, wherein (1) said liquid diphenylmethane diisocyanate comprises less than 10% by weight of 2,4'-diphenylmethane diisocyanate
4. The syntactic foam of Claim 1, wherein (1) said liquid diphenylmethane diisocyanate comprises allophanate modified diphenylmethane diisocyanate.
5. The syntactic foam of Claim 1, wherein (1) the liquid diphenylmethane diisocyanate comprises carbodiimide groups and/or uretonimine groups.
6. The syntactic foam of Claim 2, wherein (1) the liquid diphenylmethane diisocyanate comprises the reaction product of diphenylmethane diisocyanate with a polyether polyol containing at least 80% by weight of ether units derived from propylene oxide.
7. The syntactic foam of Claim 6, wherein the polyether polyol comprises dipropylene glycol, tripropylene glycol or mixtures thereof.
8. The syntactic foam of Claim 1, wherein (2) said isocyanate-reactive component comprises (a) from 10 to 30% by weight of one or more polyether polyols having a functionality of about 3, a molecular weight of between about 240 and 4,000, and a hydroxyl number of about 42 to about 700;
(b) from about 30 to about 80% by weight of one or more low unsaturation polyether polyols having an OH functionality of about 2, a molecular weight of from about 500 to about 3,000 and a hydroxyl number of about 37 to about 224;
and (c) from about 30 to about 80% by weight of one or more polyether polyols having an OH functionality of about 3 to about 4, a molecular weight of about 500 to about 1,000 and ara OH number of about 168 to about 448.
9. A process for preparing a syntactic foam, comprising reacting:
(1) a liquid diphenylmethane diisocyanate having an NCO group content of from about 10 to about 33.6% and a viscosity from about
10 to about 5,000 mPa.cndot.s @ 25°C, with (2) an isocyanate-reactive component comprising:
(a) at least 10% by weight of one or more polyether polyols having a functionality of 2 to 4, a molecular weight of 200 to 8,000 , and a hydroxyl number of 14 to 1,120, wherein at least one amine group is present in the starter for said polyether polyol, and the starter being alkoxylated by 100%
by weight of propylene oxide;
(b) at least 20% by weight of one or more low unsaturation polyether polyols having an OH functionality of about 2, a molecular weight of 250 to 8,000, and a hydroxyl number of about 14 to 448, wherein the starter for said low unsaturation polyether polyol comprises water or an organic component containing two hydroxyl groups, and the starter being alkoxylated with 100% by weight of propylene oxide;
(c) at least 20% by weight of one or more polyether polyols having an OH functionality of about 3 to 6, a molecular weight of about 400 to about 3,000, and an hydroxyl number of about 56 to about 840, wherein the starter for said polyether polyol comprises an organic compound containing at least three hydroxyl groups, and the starter being alkoxylated with 100% by weight of propylene oxide;
and, optionally, (d) up to 10% by weight of one or more low molecular weight diols and/or triols having an equivalent weight of from 31 to 99;
wherein the %'s by weight of (2)(a), (2)(b), (2)(c) and (2)(d) totals 100% by weight of component (2);
(3) from 10 to 70% by weight, based on the combined weight of components (1), (2) and (3), of a filler having a density of less than 1 g/cm3;
and (4) at least one organo-metallic catalyst in the amount of about 0.001 to about 1% by weight, based on 100% by weight of component (2);
wherein the relative amounts of components (1) and (2) are such that the isocyanate index is from about 90 to about 120.
10. The process of Claim 9, wherein (1) said liquid diphenylmethane diisocyanate comprises up to 70% by weight of 2,4'-diphenylmethane diisocyanate, no more than 2% by weight of 2,2'-diphenylmethane diisocyanate, and the balance being 4,4'-diphenylmethane diisocyanate, such that the sum of the 2,4'-MDI, the 2,2'-MDI and the 4,4'-MDI totals 100% by weight of the liquid diphenylmethane diisocyanate.
11. The process of Claim 10, wherein (1) said liquid diphenylmethane diisocyanate comprises less than 10% by weight of 2,4'-diphenylmethane diisocyanate
12. The process of Claim 9, wherein (1) said liquid diphenylmethane diisocyanate comprises allophanate modified diphenylmethane diisocyanate.
13. The process of Claim 9, wherein (1) the liquid diphenylmethane diisocyanate comprises carbodiimide groups and/or uretonimine groups.
14. The process of Claim 10, wherein (1) the liquid diphenylmethane diisocyanate comprises the reaction product of diphenylmethane diisocyanate with a polyether polyol containing at least 80% by weight of ether units derived from propylene oxide.
15. The process of Claim 14, wherein the polyether polyol comprises dipropylene glycol, tripropylene glycol or mixtures thereof.
16. The process of Claim 9, wherein (2) said isocyanate-reactive component comprises (a) from 10 to 30% by weight of one or more polyether polyols having a functionality of about 3, a molecular weight of between about 240 and 4,000, and a hydroxyl number of about 42 to about 700;
(b) from about 30 to about 80% by weight of one or more low unsaturation polyether polyols having an OH functionality of about 2, a molecular weight of from about 500 to about 3,000 and a hydroxyl number of about 37 to about 224;
and (c) from about 30 to about 80% by weight of one or more polyether polyols having an OH functionality of about 3 to about 4, a molecular weight of about 500 to about 1,000 and an OH number of about 168 to about 448.
17. A process for preparing a pipe insulated with a syntactic foam, comprising:
(I) placing a steel pipe in the center of a cylindrical mold with the diameter of the mold being larger than the diameter of the pipe, wherein the difference in diameter between the pipe and the mold determines the thickness of the syntactic foam to be applied;
(II) pouring a liquid polyurethane reaction mixture containing a filler around the steel pipe in the mold, wherein said liquid polyurethane reaction mixture is formed by:
(A) blending (3) a filler having a density of less than 1 g/cm3 with (1) a liquid diisocyanate component and/or (2) an isocyanate-reactive component, (B) adding (4) an organo-metallic catalyst to the isocyanate-reactive component which may or may not contain a filler;
and (C) mixing the liquid diisocyanate component with the isocyanate-reactive component, wherein:
(1) said liquid diisocyanate component comprises liquid diphenylmethane diisocyanate having an NCO group content of from about 10 to about 33.6% and a viscosity from about 10 to about 5,000 mPa-s @ 25°C, with (2) an isocyanate-reactive component comprising:
(a) at least 10% by weight of one or more polyether polyols having a functionality of 2 to 4, a molecular weight of 200 to 8,000, and a hydroxyl number of 14 to 1,120, wherein the starter for said polyether polyol comprises at feast one amine group, and said starter being alkoxylated by 100% by weight of propylene oxide;
(b) at least 50% by weight of one or more low unsaturation polyether polyols having an OH functionality of about 2, a molecular weight of 250 to 8,000, and a hydroxyl number of 14 to 448, wherein the starter comprises water or an organic component containing at least two hydroxyl groups, and said starter being alkoxylated with 100% by weight of propylene oxide;
(c) at least 20% by weight of one or more polyether polyols having an OH
functionality of about 3 to about 6, a molecular weight of about 400 to about 3,000, and an hydroxyl number of about 56 to about 840, wherein the starter for said polyether polyol comprises an organic compound containing at least three hydroxyl groups, and said starter being alkoxylated with 100% by weight of propylene oxide;
and, optionally, (d) up to 10% by weight of one or more low molecular weight diols and/or triols having an equivalent weight of from 31 to 99, wherein the %'s by weight of (2)(a), (2)(b), (2)(c) and (2)(d) totals 100% by weight of component {2);
(III) allowing the liguid polyurethane reaction mi~cture containing the filler cure to form a solid polyurethane containing a filler, which encapsulates the steel pipe;
and (IV) demoiding the polyurethane encapsulated steel pipe, thereby yielding a syntactic foam insulated pipe.
18. A syntactic foam insulated pipe produced by the process of Claim 17.
CA 2431668 2002-06-18 2003-06-10 Syntactic foams with improved water resistance, long pot life and short demolding times Expired - Fee Related CA2431668C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10/174,224 2002-06-18
US10174224 US6706776B2 (en) 2002-06-18 2002-06-18 Syntactic foams with improved water resistance, long pot life and short demolding times

Publications (2)

Publication Number Publication Date
CA2431668A1 true true CA2431668A1 (en) 2003-12-18
CA2431668C CA2431668C (en) 2011-02-08

Family

ID=27612952

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2431668 Expired - Fee Related CA2431668C (en) 2002-06-18 2003-06-10 Syntactic foams with improved water resistance, long pot life and short demolding times

Country Status (9)

Country Link
US (1) US6706776B2 (en)
EP (1) EP1375577B1 (en)
JP (1) JP4296045B2 (en)
KR (1) KR100975452B1 (en)
CN (1) CN1293114C (en)
CA (1) CA2431668C (en)
DE (1) DE60329143D1 (en)
DK (1) DK1375577T3 (en)
ES (1) ES2330512T3 (en)

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Also Published As

Publication number Publication date Type
EP1375577B1 (en) 2009-09-09 grant
US6706776B2 (en) 2004-03-16 grant
CN1470543A (en) 2004-01-28 application
JP4296045B2 (en) 2009-07-15 grant
JP2004162010A (en) 2004-06-10 application
DK1375577T3 (en) 2009-12-14 grant
US20030232899A1 (en) 2003-12-18 application
EP1375577A1 (en) 2004-01-02 application
KR20040002560A (en) 2004-01-07 application
CA2431668C (en) 2011-02-08 grant
KR100975452B1 (en) 2010-08-11 grant
CN1293114C (en) 2007-01-03 grant
ES2330512T3 (en) 2009-12-11 grant
DE60329143D1 (en) 2009-10-22 grant

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