Rigid polyurethane foams

 

(57) Abstract:

Method of production of rigid polyurethane or modified urethane PIR foam panels. for thermal insulation contains stage of the interaction between polyisocyanate composition with a polyfunctional isocyanate-reactive composition, free from surface-active substances based on silicone. Polyfunctional isocyanate-reactive composition contains an amine-initiated simple polyester polyol and optional simple polyester polyol with a functionality of from 2 to 6 and an average molecular weight between 1000 and 10000. Polyisocyanate composition may contain the reaction product of stoichiometric excess of organic MDI and substantially fluorinated isocyanate-reactive compound. Rigid polyurethane foams and modified urethane peoplesolidarity obtained by the proposed method have a fine uniform cell structure and a more isotropic structure in the more durable foam. 2 c. and 19 C.p. f-crystals, 12 tab.

The invention relates to rigid polyurethane foams or modified urethane to penopolistirolbeton and to methods for their preparation.

Hard peopol onopening towards polyisocyanates and isocyanate compounds (usually polyols) in the presence of a blowing agent. One application of such foams is the insulating medium in buildings, refrigerators and other domestic use.

Surface-active materials or foam stabilizers are important ingredients in the production of rigid polyurethane foams. They serve to facilitate mixing of the components to regulate cell size of the foam and to stabilize the formed foam.

Often such surface-active substances are substances based on silicon. The main drawback of these materials is their price. Therefore, it is desirable to use compositions to obtain foams that do not contain surface-active substances on the basis of silicones.

In patent WO 95/16721 described the use of specially developed naselyonnogo surfactants on the basis of polyether in the production of polyurethane foams.

One of the objects of this invention are rigid polyurethane foams obtained without the use of surfactants based on silicones.

Another object of this invention to provide a rigid polyurethane foams that do not contain surface-active substances based on silicone, with whom this invention, rigid polyurethane foams and modified urethane peoplesolidarity offered to get the reaction of the polyisocyanate composition with a polyfunctional isocyanate-reactive composition in the presence of a blowing agent and in the absence of surface-active substances based on silicone; and the polyfunctional isocyanate-reactive composition contains an amine-initiated simple polyester polyol known in the art for the production of rigid polyurethane foams.

Although the foam of the present invention obtained in the absence of surface-active substances based on silicone, they have a fine uniform cell structure. Additionally, the foams of this invention have a more isotropic structure in the more durable foam, especially in the weakest direction (usually at the free foaming perpendicular to the direction of rise), with improved dimensional stability and a more stable low density compared with the pins previously prigotovleniya in the technique in the presence of surface-active substances based on silicone.

Initiated by the amine simple polyester polyol for use in this invention is the reaction product of alkalisation, for example, ethylene oxide and/or propylene oxide with the amine-initiator containing from 2 to 8 active hydrogen atoms per molecule. Suitable amines-initiators are Ethylenediamine, ethanolamine, N-methylethanolamine, N-acylethanolamine, diethanolamine, triethanolamine, triisopropanolamine, ammonia, the ins-initiators are, in particular, polymethylenepolyphenylisocyanate. Can be used with other types of coinitiators.

The total number of amine-initiated polyether polyol is at least 20% by weight calculated on the total number of isocyanate-reactive compounds, preferably at least 30% and most preferably from 40 to 80%.

Mainly polyfunctional isocyanate-reactive compositions for use in this invention contain a simple polyester polyol known in the art for the production of flexible polyurethane foams.

Such a simple polyester polyol has an average nominal functionality of from 2 to 6, preferably from 2 to 4 and an average molecular weight from 1,000 to 10,000. IT is the number of such polyether polyol is typically in the range from 20 to 80, preferably from 26 to 57 mg KOH/g

These ethers, polyols obtained by polymerization of cyclic oxides such as ethylene oxide and propylene oxide, in the presence of a polyfunctional initiator. Suitable initiators contain a variety of active hydrogen atoms and can be water and polyols, for example ethylene glycol, propylene glycol, diethylene glycol, dipropylenetriamine, sorbitol or sucrose. Can be used a mixture of initiators and/or cyclic oxides.

Especially applicable ethers of polyols known in the art for the production of flexible polyurethane foams are polyoxypropylene and trioli and poly(oksietilenom-oxypropylene)diols and trioli obtained by simultaneous or sequential accession ethylene and propylenoxide to di - or trifunctional initiators, as fully described previously. You can refer to statistical copolymers containing oxyethylene from 10 to 80%, block copolymers containing oxyethylene to 25% and the statistical block copolymers containing oxyethylene up to 50% calculated on the total weight oxyalkylene units. In practice, you can apply a mixture of such diols and triolo. Preferred dialami and trioligy are ethylene glycol, diethylene glycol, dipropyleneglycol and glycerin. Preferred simple polyether polyols are block copolymers having oxyethylene blocks at the ends of the polyether. Such block copolymers are referred to as blocked with ethylene oxide polyols. The content of oxyethylene in such preferred polyols blocked with ethylene oxide, preferably is of ipirou polyols, known in practice for the production of flexible polyurethane foams, is from 1 to 25%, preferably from 1 to 15%, most preferably from 1 to 10% by weight in the calculation of all isocyanate-reactive components.

In accordance with a further implementation of the present invention polyisocyanate composition for use in this method comprises the reaction product of stoichiometric excess of organic MDI and (a) substantially fluorinated isocyanate-reactive compound(s).

The term "substantially fluorinated isocyanate-reactive compound" is used here to refer to organic compounds containing at least one isocyanate-reactive functional group, in which at least 50% of the hydrogen atoms attached to carbon atoms in the corresponding non-fluorinated compound are replaced with fluorine atoms.

The reaction products of organic polyisocyanates and substantially fluorinated isocyanate-reactive compounds, which are applicable in the method of the present invention described in the patent EP-A-0605105.

In particular, preferred mainly fluorinated isocyanate-reactive socila group with unbranched or branched chain, containing from 2 to 10 carbon atoms, n is an integer from 1 to 11, x = 0 or 1 and R is hydrogen or C1-12is an alkyl group or R'-OH, where R' - C1-12-Allenova group.

In particular, there may be mentioned such compounds of formula (1), where n=1 or 2, A - perfluorinated C3-10preferably C6-8alkyl normal or isotrate, R is hydrogen or C1-4alkyl and R' - C1-4alkylen as (performaer) methanol, (performatic) methanol, (performancel) methanol, (perferences) methanol, (perforated) methanol, (perforater) methanol, (perftoran) methanol, (perforated)ethanol, (performaer) ethanol, (performatic) ethanol, (performancel) ethanol, (perferences)ethanol, (perforated) ethanol, (perforater) ethanol, N-ethyl-N-2-hydroxyethylpiperazine, N-methyl-N-2-hydroxyethylpiperazine, N-propyl-N-2-hydroxy-atyperatyshem, N-2-hydroxyethylpiperazine, N-ethyl-N-2-hydroxymethylphosphonate, N-methyl-N-2-hydroxymethylphosphonate, N-propyl-N-2-hydroxymethylphosphonate, N-2-hydroxymethylphosphonate, N-methyl-M-2-hydroxyethylphosphonate and bis-N-2-hydroxyethylpiperazine.

Appropriate what EDINENIE(s) with the formation of the reaction product for use in the method of the present invention are any known in the art for the production of rigid foam polyurethane or modified urethane of penopolistirolbeton, and in particular aromatic polyisocyanates, such as diphenylmethanediisocyanate in the form of its 2,4'-, 2,2'- and 4,4'-isomers and mixtures thereof, mixtures of diphenylmethanediisocyanate (MDI) and oligomers, known in practice as "crude" or polymeric MDI (polymethylenepolyphenylisocyanate) with isocyanate functionality of more than 2, colorvision in the form of its 2,4 - and 2,6-isomers or mixtures thereof, 1,5-naphthalenedisulfonate and 1,4-diisocyanatobutane. Other organic isocyanates which may be mentioned are aliphatic diisocyanates, such as isophoronediisocyanate, 1,6-diisocyanatohexane and 4,4'-diisocyanatohexane.

The above-mentioned polyisocyanate compositions for use in the method of this invention can easily be obtained by adding a separate substantially fluorinated isocyanate-reactive compound to an organic polyisocyanate or by adding a mixture substantially fluorinated isocentricity compounds to organic polyisocyanate, for example, under conditions well known in practice to obtain prepolymers with terminal isocyanate groups.

Preferably substantially photo is from 0.1 to 3% by weight based on the weight of organic MDI.

To improve the stability of the polyisocyanate composition is useful allophanate variant of the common fluorinated prepolymer with terminal isocyanate groups. This allophanate option can be obtained by the reaction of conventional fluorinated prepolymer with terminal isocyanate groups with an organic polyisocyanate in the presence of a suitable catalyst.

Polyisocyanate composition for use in the method of the present invention may contain only one type of reaction product or may contain different types of such reaction products from various substantially fluorinated isocyanate-reactive compounds and/or different polyisocyanates.

In the preferred implementation method of this invention, the polyisocyanate compositions include the reaction product of organic MDI and substantially fluorinated isocyanate-reactive compound, as described above, and a polyfunctional isocyanate-reactive compositions contain a simple polyester polyol known in the manufacture of flexible polyurethane foams, as described above, and initiated an amine simple polyester polyol known in the production of the nation's ingredients also exhibit good insulating properties.

Suitable organic polyisocyanates for use in the method of the present invention are any known in practice for the production of rigid foam polyurethane or modified urethane of penopolistirolbeton and, in particular, aromatic polyisocyanates, such as diphenylmethanediisocyanate in the form of its 2,4'-, 2,2'- and 4,4'-isomers or mixtures thereof, mixtures of diphenylmethanediisocyanate (MDI) and oligomers known in the art as "crude" or polymeric MDI (polymethylenepolyphenylisocyanate) with isocyanate functionality of more than 2, colorvision in the form of its 2,4 - and 2,6-isomers and mixtures thereof, 1,5-naphthalenedisulfonate and 1,4-diisocyanatobutane. Other organic polyisocyanates that may be mentioned are isophorondiisocyanate, 1,6-diisocyanatohexane and 4,4'-diisocyanatohexane. Other suitable polyisocyanates for use in the method of the present invention are described in the patent EP-A-0320134.

Other polyfunctional isocyanatoacetate compositions, which can react polyisocyanate composition with the formation of rigid polyurethane foam or modified in is particularly important for the production of rigid foams are polyols and mixtures of polyols, having an average hydroxyl number of from 300 to 1000, especially from 300 to 700 mg KOH/g, and a hydroxyl functionality of from 2 to 8, especially from 3 to 8. Suitable polyols have been fully described previously and are the reaction products of alkalisation, for example, ethylene oxide and/or propylene oxide, with initiators containing from 2 to 8 active hydrogen atoms per molecule. Suitable initiators are polyols, for example glycerol, trimethylolpropane, triethanolamine, pentaerythritol, sorbitol and sucrose; and mixtures of such initiators. Other suitable polymeric polyols are polyesters (especially aromatic polyesters), obtained by condensation in the respective proportions of glycols and polyols of higher functionality with dicarboxylic or polycarboxylic acids. Suitable polymeric polyols are also simple polythioether, polyamides, complex polyaminoamide, polycarbonates, Polyacetals, polyolefins and polysiloxanes with terminal hydroxyl groups.

The amount of polyisocyanate compositions and polyfunctional isocyanate-reactive compositions, which must react, depends on the nature of the hard foam polyurethane or modified urethane-foam">

The method of this invention involves carrying out the reaction in the presence of any foaming substances, known in practice for the production of rigid foam polyurethane or modified urethane of penopolistirolbeton. Such foaming agents are water or compounds that emit carbon dioxide or inert low-boiling compound with a boiling point of about -70oC at atmospheric pressure.

If the foaming substance use water, its quantity can be selected in a known manner to obtain the desired foam density; the usual number is from 0.05 to 5% by weight per the whole reaction system.

Suitable inert foaming substances are well known and described in the art, for example, hydrocarbons, simple dialkyl ethers, alkalinity, aliphatic and cycloaliphatic fluorocarbons, perchloromethane, chlorofluorocarbons, chlorohydrocarbons and fluorine-containing ethers.

Examples of preferred foaming agents are n-pentane, isopentane, cyclopentane and any mixtures of 1,1-dichloro-2-foraten (HCFC, 141b), 1,1,1-Cryptor-2-foraten (HFC 134a), Chlorodifluoromethane (HCFC 22), 1,1-debtor,1,3,3-pentafluorobutane (HFC 365mfc), deformity (HFC 32) and their mixtures, including mixtures of hydrocarbons and chlorofluorocarbons and/or fluorocarbons. In particular, there can be mentioned a mixture of foaming agents, as described in PCT patent N 96/12758 for the production of rigid polyurethane foams with low density and steel. These compounds foaming agents contain at least 3 and preferably at least 4 components, of which preferably at least one (cyclo)alkanol (preferably 5 or 6 carbon atoms) and/or acetone.

The total number of foaming agents for use in the reaction system for the formation of porous polymeric materials can easily be determined by known methods, but typically ranges from 2 to 25% by weight per the whole reaction system.

The density of the foams of this invention will typically range from 15 to 70 kg/m3, preferably from 20 to 50 kg/m3most preferably from 25 to 40 kg/m3.

In addition to the polyisocyanates and polyfunctional isocyanate-reactive compositions and foaming agents foaming reaction mixture may typically contain auxiliary ingredients or additives, the usual. the quality of such additives can be selected cross-linking agents, such as polyols with low molecular weight, such as triethanolamine, catalysts for urethane, for example, tin compounds such as octoate tin or dilaurate dibutylamine, or tertiary amines, such as dimethylcyclohexylamine or triethylenediamine, flame retardants, for example halogenated alkylphosphate, such as trichloropropane.

Foaming reaction mixture may also contain stabilizing foam substances or surfactants are not silicone-based, such as surface-active substances on the basis of acetylene, fluorinated surfactants on the basis of acetylene, fluorinated surfactants (e.g., as described in patents US 5453540, US 5292716, US 5211873, US 5210106, US 5162385 and "Organofluorine Chemistry", R. Banks, B. Smart, J. Tatlow, part 11, 14, 17, 20, 21, 22), chlorinated or propoxycarbonyl nonylphenols, ethoxylated or propoxycarbonyl C6-C26monooly, cationic or anionic surfactants or other, as described in "Handbook of surfactants", 1991, Porter, part 6 to 12.

The addition of these surfactants can improve the insulating Sogo invention, is insoluble fluorinated compound, giving the foam with smaller cells and improves insulation.

The term "insoluble" is used here to refer to the insoluble fluorinated compound, identified as showing the solubility of either the isocyanate-reactive composition, or in the polyisocyanate composition with which it can be mixed in quantities of less than 500 ppm (parts per thousand or per million) by weight at 25oC and atmospheric pressure. Insoluble fluorinated compound for use in the method of the present invention may be one described in patents US N 4981897, N 5034424, N 4972002, EP N 0508649 and 0498628 and PCT N 95/18176. It is preferable to apply insoluble, substantially fluorinated or perfluorinated compound with a boiling point of at least 20oC at atmospheric pressure. The term "substantially fluorinated" is used here to refer to an insoluble substantially fluorinated compound applicable in the method of this invention, should be understood to encompass compounds in which at least 50% of the hydrogen atoms in the non-fluorinated compounds is replaced by fluorine. Suitable compounds allayannis or perfluorinated ethers, substantially fluorinated or perfluorinated tertiary amines, substantially fluorinated or perfluorinated simple amino esters and substantially fluorinated or perfluorinated sulfones. Suitable examples of substantially fluorinated or perfluorinated hydrocarbons are hydrocarbons containing from 1 to 15 carbon atoms that may be cyclic or acyclic, aromatic or aliphatic, and saturated or unsaturated, such as substantially fluorinated or perfluorinated methane, ethane, propane, butane, pentane, hexane, heptane, octane, Noonan, Dean, CYCLOBUTANE, cyclooctane, cyclohexane, cyclopentane, Cycloheptane, norbornadiene, decalin, dimethylcyclobutane, methylcyclohexane, 1-metallically, phenanthrene, dimethylcyclobutane and their isomers. In particular, there may be mentioned various isomers of performanta and perftorgeksan, such as PERFLUORO-n-pentane and PERFLUORO-n-hexane and dimers of hexaferrite and trimers, such as PERFLUORO(4-methylpent-2-ene). Some insoluble fluorinated compounds, suitable for use in the method of the present invention, act as a foaming substance under conditions suitable for haema in the reaction mixture. To avoid doubt, such materials may be partially or fully perform the function of foaming substances in addition to the insoluble fluorinated compounds. The amount of insoluble fluorinated compounds used in the method of this invention, is in the range from 0.05 to 10%, preferably from 0.1 to 5%, most preferably from 0.6 to 2.3% by weight per the whole foaming composition. Insoluble fluorinated compound is usually administered in the foamable reaction mixture in the form of an emulsion or preferably microemulsions in one of the main components, i.e. the isocyanate-reactive component and/or polyisocyanate component. Such emulsions or micro-emulsions can be prepared using conventional technology and suitable emulsifiers are, for example, fluorinated surfactants.

In the process of manufacture of rigid resins in accordance with this invention can be used known single-stage forprimary or polypropolene technology together with suitable methods of mixing, and rigid foam can be obtained in the form of a sheet of raw materials, molded products, gaskets for filling the Haya plaster, plastic, paper or metal.

Various aspects of the present invention is illustrated but not limited by the following examples, which used the following ingredients:

DALTOLAC R 180: not initiated by the amine simple polyester polyol, manufactured by Imperial Chemical Industries (f 4.5, OH-number 440 mg KOH/g).

DALTOLAC R 260: not initiated by the amine simple polyester polyol, manufactured by Imperial Chemical Industries (OH-number 310 mg KOH/g).

DALTOLAC R 130: not initiated by the amine simple polyester polyol, manufactured by Imperial Chemical Industries (OH-number 460 mg KOH/g).

DALTOLAC R 200: not initiated by the amine simple polyester polyol, manufactured by Imperial Chemical Industries (OH number 380 mg KOH/g).

DALTOLAC R 090: not initiated by the amine simple polyester polyol, manufactured by Imperial Chemical Industries (OH-number 540 mg KOH/g).

POLYOL X: simple polyester polyol (f 3.2, OH-number 495 mg KOH/g), initiated by polymethylenepolyphenylisocyanate.

POLYOL Y: simple polyester polyol (OH-number 310 mg KOH/g), initiated by polymethylenepolyphenylisocyanate.

DALTOCEL F 455: protected eto simple polyester polyol, manufactured by Imperial Chemical Industries (OH-number 53-57 mg KOH/g).

DALTOCEL F 428: protected eto simple palm simple polyester polyol, manufactured by Imperial Chemical Industries (OH-number of 28 and 32 mg KOH/g).

DALTOCEL F 436: protected eto simple polyester polyol, manufactured by Imperial Chemical Industries (OH-number 24-38 mg KOH/g).

DALTOCEL F 452: protected eto simple polyester polyol, manufactured by Imperial Chemical Industries (OH-number 50-54 mg KOH/g).

DALTOCEL F 448: protected eto simple polyester polyol, manufactured by Imperial Chemical Industries (OH-number 46-50 mg KOH/g).

POLYOL A: a mixture of polyols with an OH number 417 mg KOH/g, containing 60% by weight polyether polyol initiated polymethylenepolyphenylisocyanate.

POLYOL B: a mixture of polyols with an OH number 417 mg KOH/g, containing polyether polyols initiated by sucrose.

POLYOL C: a mixture of polyols with an OH number 417 mg KOH/g, containing polyether polyols, sorbitol initiated.

PPG 425: polypropyleneglycol (MW (molecular weight 425).

Polycat 8: catalyst, manufactured by Air Products.

Polycat 5: catalyst, manufactured by Air Products.

NIAX A1: catalyst, manufactured by Union Carbide.

SFB: catalyst manufactured by Imperial Chemical Industries.

L 6900: silicone surfactant manufactured by OSi.

B 1400A: silicone surface is eskimoe Goldschmidt.

SURFYNOL: surfactant that does not contain silicone, manufactured by Air Products.

Emulsifier: a mixture of perfluorinated C6-C11isomers containing unsaturated linkages.

SUPRASEC DNR: polymer diphenylmethanediisocyanate (MDI), manufactured by Imperial Chemical Industries.

SUPRASEC 2021: prepolymer of MDI, manufactured by Imperial Chemical Industries.

The PREPOLYMER: polyisocyanate composition obtained by the reaction of SUPRASEC DNR with 0.1% by weight (based on the polyisocyanate) FC10, perfluroocatanesulfonic manufactured by 3M.

DALTOLAC, DALTOCEL and SUPRASEC is a trademark of Imperial Chemical Industries.

Example 1

Rigid foam were obtained from the ingredients listed in table. 1.

The reaction proceeds in accordance with the period of the formation of "dumping", the formation of the layers and by the end of the period of expansion.

We measured the following properties: density kernel (in accordance with DIN 53420), the initial value of Lambda (at 0oC in accordance with ISO 2581) and compressive strength (in accordance with DIN 53421) in the direction of foaming and perpendicular to the foaming. The results are shown in table. 1.

These results show that at similar density and the re is s, especially in the direction perpendicular to the foaming than in the reference pins (N 1) containing surface-active agent based on silicone. It was also discovered that the foam N 1 undergoes shrinkage, whereas foam N 2 and 3 do not shrink. In addition, the use of prepolymers with fluorinated isocyanate terminal groups (foam N 3) provides superior thermal insulation (Lambda).

Example 2

Were obtained hard foam with an NCO index 105 of the ingredients listed in table. 2.

Foam from 5 to 12 plushevaya, while foam with 1 to 4 have a good structure, especially foam 3 and 4.

Example 3

Rigid foam were obtained from the ingredients listed in table. 3. The results presented in table. 3, show that does not contain silicones composition requires the presence of amine-initiated polyether polyol (foam 15 in comparison with foam 14). Can be achieved stably low density foam according to the method of the present invention (foam 15 in comparison with foam 13).

Example 4

Rigid polyurethane foams were obtained from the ingredients listed in table. 4. Properties of the foams were measured. The results are presented in table. 4.

Example 5

Hard menopol is aulani in table. 5, illustrating the improved heat resistance when using additives surfactants on nesulyginamos basis.

Example 6

Rigid polyurethane foams were obtained from the ingredients listed in table. 6. Properties of the foams were measured. The results are presented in table. 6, illustrating the superior compressive strength of the foams of this invention.

Example 7

Rigid polyurethane foams were obtained from the ingredients listed in table. 7. Properties of the foams were measured. The results are presented in table. 7.

Example 8

Were obtained hard foam index NCO 112 of the ingredients listed in table. 8.

The results presented in table. 8 show that with the method of the present invention obtained more isotropic foam.

Example 9

Were obtained hard foam of the ingredients listed in table. 9. The results presented in table. 9, show that it is more profitable to use polyether polyols, known for the manufacture of flexible polyurethane foams than esters containing ethyleneoxide group.

Example 10

Rigid foam were obtained from the ingredients listed in table. 10. The results presented the tx2">

Example 11

Rigid foam were obtained from the ingredients listed in table. 11. The results presented in table. 11, illustrate the influence of polyether polyols initiated amines.

Example 12

Were obtained hard foam index NCO 108 of the ingredients listed in table. 12.

The results presented in table. 12, show that a more stable foam (stability measured in accordance with ISO 2796) at a lower density can be obtained with the method of the present invention. Turnover also improved. The resistance can be further improved by using asilicone surfactants.

1. A method of obtaining a hard foamed polyurethane or modified urethane of penopolistirolbeton containing phase interaction polyisocyanate composition with a polyfunctional isocyanate-reactive composition, free from surface-active substances based on silicone in the presence of a blowing agent, characterized in that the polyfunctional isocyanate-reactive composition contains an amine-initiated simple polyester polyol.

2. The method according to p. 1, characterized in that coatroom, containing from 2 to 8 active hydrogen atoms in the molecule.

3. The method according to p. 2, characterized in that the initiator is an aromatic amine.

4. The method according to p. 3, characterized in that aminoven the initiator is polymethylenepolyphenylisocyanate.

5. The method according to any of the preceding items, wherein the amine-initiated simple polyester polyol has IT-a number in the range from 300 to 1000 mg KOH/g

6. The method according to any of the preceding items, wherein the amine-initiated simple ether polyol is present in amounts of at least 20% by weight calculated on the total number of isocyanate-reactive compounds.

7. The method according to any of the preceding paragraphs, characterized in that the polyfunctional isocyanate-reactive composition additionally contains a simple polyester polyol with an average nominal functionality of from 2 to 6 and an average molecular weight between 1000 and 10000.

8. The method according to p. 7, characterized in that a simple polyester polyol has an average nominal functionality of from 2 to 4.

9. The method according to p. 7 or 8, characterized in that a simple polyester polyol has IT-a number between 20 and 80 mg KOH/g

and a triol or poly(oksietilenom-oxypropylene)diola or triol, obtained by simultaneous or sequential addition of ethylene and propylenoxide to di - or trifunctional initiators.

11. The method according to p. 10, wherein the di - or trifunctional initiators selected from the group consisting of ethylene glycol, diethylene glycol, dipropyleneglycol and glycerin.

12. The method according to p. 10 or 11, characterized in that a simple polyester polyol is blockcopolymers blocked with ethylene oxide content oxyethylene groups of at least 7% by weight calculated on the total number of oxyalkylene links.

13. The method according to any of paragraphs.7 to 12, characterized in that a simple polyester polyol used in the amount within 1 to 25% by weight calculated on the total number of isocyanate-reactive components.

14. The method according to any of the preceding paragraphs, characterized in that the polyisocyanate composition comprises the reaction product of stoichiometric excess of organic MDI and (a) mainly fluorinated isocyanate-reactive compound(s), which is a compound having at least one isocyanate-reactive functional group, in which at least 50% of the hydrogen atoms include the Method according to p. 14, characterized in that mainly fluorinated isocyanate-reactive compound corresponds to the formula I

< / BR>
where a is mainly fluorinated or perfluorinated alkyl group with unbranched or branched chain, containing from 2 to 10 carbon atoms;

n is an integer from 1 to 11;

x = 0 or 1;

R is hydrogen or C1-12alkyl or R OH R' - C1-12alkylen.

16. The method according to p. 15, wherein n = 1 or 2, And - perfluorinated C3-10an alkyl group with unbranched or branched chain, R is hydrogen or C1-4alkyl and R' - C1-4alkylen.

17. The method according to PP.14, 15 or 16, characterized in that the organic polyisocyanate, which responds mainly fluorinated isocyanate-reactive compound is diphenylmethanediisocyanate, in the form of its 2,4'-, 2,2'- or 4,4'-isomers or mixtures thereof or polymethylenepolyphenylisocyanate.

18. The method according to any of paragraphs.14 to 17, characterized in that mainly fluorinated isocyanate-reactive compound is used in amounts ranging from 0.02 to 5% by weight based on the weight of organic MDI.

19. The method according to any of the preceding paragraphs, characterized in that the foaming eenvoudig points, wherein the foamable composition contains a surfactant is not silicone-based.

21. Rigid polyurethane or modified urethane polyisocyanurate obtained by the method as defined in any of the preceding paragraphs.

 

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FIELD: chemistry.

SUBSTANCE: invention pertains to the mixture for obtaining flexible polyurethane foam and can be used as mastic for hydro and thermal insulation of foundations, buildings, pipelines, as well as for filling cavities in building structures. The mixture contains defined ratios of the following components: a hydroxyl containing oligomer-copolymer of butadiene and piperylene with molecular mass of 2100 and containing 0.92% hydroxyl groups; isocyanate component - polymethylene polyphenyl isocyanate with 29-31% content of isocyanate groups; catalysts: dibutyl tin dilaurate and N,N,N- triethylamine; water; glycerine; polydimethyl siloxane and polydimethyl siloxane modified by a polyester in the form of foam stabilisers and extra bitumen. Use of bitumen considerably lowers moisture absorption of the material and increases viscosity of the foam systems. This also enables the material to retain the density attained during foaming. Use of defined foam stabilisers in the mixture enables formation of more fine cells, with high stability and attainment of low density of the polyurethane foam.

EFFECT: lower density and moisture absorption of flexible polyurethane foam.

10 ex, 2 tbl

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