EP2794224A2 - Procédé servant à appliquer une couche de mousse polyuréthane - Google Patents

Procédé servant à appliquer une couche de mousse polyuréthane

Info

Publication number
EP2794224A2
EP2794224A2 EP12812211.6A EP12812211A EP2794224A2 EP 2794224 A2 EP2794224 A2 EP 2794224A2 EP 12812211 A EP12812211 A EP 12812211A EP 2794224 A2 EP2794224 A2 EP 2794224A2
Authority
EP
European Patent Office
Prior art keywords
foam
polar
spray
blowing agent
composition
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.)
Withdrawn
Application number
EP12812211.6A
Other languages
German (de)
English (en)
Inventor
Milan Sebestian
Felicitas Kolenda
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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
Application filed by Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP2794224A2 publication Critical patent/EP2794224A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/367—Feeding the material to be shaped using spray nozzles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/16—Catalysts
    • C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
    • C08G18/20—Heterocyclic amines; Salts thereof
    • C08G18/2081—Heterocyclic amines; Salts thereof containing at least two non-condensed heterocyclic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/142—Compounds containing oxygen but no halogen atom
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00—Foam properties
    • C08G2110/0025—Foam properties rigid
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00—Foam properties
    • C08G2110/0041—Foam properties having specified density
    • C08G2110/005—< 50kg/m3
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2201/00—Foams characterised by the foaming process
    • C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
    • C08J2201/022—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments premixing or pre-blending a part of the components of a foamable composition, e.g. premixing the polyol with the blowing agent, surfactant and catalyst and only adding the isocyanate at the time of foaming
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2207/00—Foams characterised by their intended use
    • C08J2207/04—Aerosol, e.g. polyurethane foam spray
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes

Definitions

  • the invention relates to a method for applying a crosslinkable composition of polyurethane prepolymers together with blowing agents from disposable pressure vessels, wherein the composition is sprayable and foams when hitting the substrate or immediately before impact, so that a foamed coating is obtained.
  • DE 10108445 describes a pressure vessel containing a mixture of polyether polyols having a molecular weight of 3,000 to 10,000 g / mol, polyester polyols having a different molecular weight and isocyanate. Propellants are also added, for example tetrafluoroethane. A use for producing elastic foams is described.
  • EP 1518654 describes a method for the continuous production of composite elements which have a PU foam layer between two cover layers. The two PU components are fed separately and mixed immediately before application and applied to the substrate surfaces.
  • 1K PU foam precursors in disposable cans are well known. These are provided with different propellants. Usually, these materials are discharged via a nozzle with a pipe feed. The feed is used for the purpose of bringing the foaming material directly to the application site. Neighboring areas are therefore not polluted. Thus, the usual application, such as cavity filling, attachment of components, sealing gaps can be performed well.
  • the viscosity of the materials and the reactivity are adjusted so that a flow into the cavity is easily possible. At the same time a rapid hardening should take place in order to enable a quick further work on the machined areas.
  • the blowing agent is selected so that foaming and filling of the hollow is ensured, then stable foam materials are to be obtained after crosslinking.
  • these foam precursors have a higher viscosity, which promotes rapid solidification.
  • the result is that the foam materials are applied as already foamed bead, spraying is not possible. If you want to coat larger surfaces with a foam, they must be applied areally. A spreading and smoothing of a foaming surface is poorly possible because it affects the foam. Likewise, the material sticks to a possible smoothing device, so that impurities immediately arise. It forms so uneven surfaces.
  • the object of the present invention is therefore to provide reactive foam precursors which can be used in a spray application. These are adjusted in viscosity and reactivity so that a spray application is possible.
  • the sprayed particles should finally foam on the substrate as a layer and crosslink.
  • the foam should be able to be applied to the substrate to be coated without dripping or draining from the substrate.
  • the foam structure should also be preserved during crosslinking. In this case, a coating is to be made possible at changing locations, a cleaning of the container parts should be avoided.
  • the object is achieved by a process for coating substrates with a crosslinkable layer of a polyurethane foam, wherein a composition comprising a reactive 1-component PU foam precursor and at least one blowing agent is present in a disposable pressure vessel, the composition dispersed by spray application into droplets and foaming of the droplets takes place after spraying and / or in the formation of the layer, wherein the spray jet is produced by a perforated nozzle and at least a portion of polar blowing agents are used, selected from dimethyl ether, dimethoxymethane, diethyl ether, dimethoxyethane, acetone and / or other readily volatile polar solvents.
  • Another object of the invention is the use of moisture crosslinking 1K PU foam precursors containing polar blowing agents for spray application of PU foam layers wherein the spray jet is generated through a hole die.
  • the invention also relates to one-way pressure vessels filled with a sprayable, moisture-curing, foamable 1K polyurethane composition. Furthermore, the pressure vessel still contains at least one polar propellant, which emerges from the container with the composition as a spray jet through a hole nozzle and additionally serves as a propellant for producing a foam.
  • suitable 1-component PU foam precursors contain a prepolymer component having a content of reactive NCO groups of at least 5% by weight (based on the non-volatile constituents).
  • polyfunctional alcohols are reacted with an excess of monomeric polyisocyanates.
  • Suitable polyisocyanates are, for example, symmetrical or asymmetrical aliphatic or aromatic polyisocyanates.
  • the known lacquer isocyanates can be used, for example isophorone diisocyanate (IPDI), 2,2 ' -, 2,4- and / or 4,4'-diphenylmethane diisocyanate (MDI), hydrogenated MDI (H12MDI), xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), the isomers of tolylene diisocyanate (TDI), 1, 5-diisocyanatonaphthalene (NDI), triisocyanatotrimethylmethane, 1, 6-diisocyanatohexane (HDI), cyclohexane-1, 4-diisocyanate, in the various isomers and as a mixture.
  • IPDI isophorone diisocyanate
  • MDI 2,2
  • All of these starting materials can be used as a technical mixture or as individual isomers. It is also possible to use reactive derivatives, for example dimeric and trimeric forms of the isocyanates, as well as their biurets and allophanates.
  • reactive derivatives for example dimeric and trimeric forms of the isocyanates, as well as their biurets and allophanates.
  • One embodiment uses at least partially asymmetric isocyanates which carry two different reactive NCO groups.
  • aromatic diisocyanates or their derivatives are suitable, for example MDI.
  • Another embodiment uses polymeric isocyanates, in particular as a technical mixture with diisocyanates.
  • the isocyanate mixtures should have an average functionality of 2 to 3.
  • low-viscosity isocyanate mixtures are used, for example mixtures with a viscosity below 200 mPas (25 ° C), in particular below 100 mPas. This can be achieved, for example, by reducing the proportion of polymeric isocyanates.
  • Suitable polyol components for the preparation of the foam precursors are liquid polyols, in particular hydroxyl-containing polyethers, polyesters or aliphatic polyols.
  • the polyols known from polyurethane technology having an average molecular weight of up to 10,000 g / mol, in particular up to 4,000 g / mol (number average molecular weight Mn, as determinable by GPC) are suitable.
  • Suitable polyether polyols are, for example, linear or branched polyethers which have a plurality of ether bonds and which contain at least two alcohol groups, preferably at the chain ends. They contain essentially no functional groups other than the OH groups.
  • Such polyether polyols are formed as reaction products of low molecular weight polyfunctional alcohols with alkylene oxides.
  • the alkylene oxides preferably have 2 to 4 carbon atoms.
  • Suitable examples are the reaction products of ethylene oxide, propylene oxide, butylene oxide or mixtures thereof with aliphatic diols, such as ethylene glycol, 1, 2-propanediol, 1, 3-propanediol, the isomeric butanediols, such as 1, 2-butanediol, 1, 3-butanediol, 1,4-butanediol and 2,3-butanediol, pentanediols and hexanediols, 2,2-dimethyl-1,3-propanediol, 2-methylpropanediol, polyglycerol, 1,6-hexanediol, 2,4,4-trimethylhexanediol-1, 6, 2,2,4-trimethylhexanediol 1, 6, 1, 4-cyclohexanedimethanol, or aromatic diols, such as 4,4'-dihydroxy-diphenylpropane
  • polystyrene resins which are suitable for the purposes of the invention are formed by polymerization of tetrahydrofuran (polyTHF). Also suitable are the reaction products of polyfunctional alcohols, such as glycerol, trimethylolethane or trimethylolpropane, pentaerythritol or sugar alcohols with the alkylene oxides.
  • polyTHF tetrahydrofuran
  • polyfunctional alcohols such as glycerol, trimethylolethane or trimethylolpropane, pentaerythritol or sugar alcohols with the alkylene oxides.
  • polyester polyols can be used. These are formed by a polycondensation reaction of a polyhydric alcohol having, for example, 2 to 15 C atoms and preferably 2 or 3 OH groups with one or more polycarboxylic acids, preferably those having 2 to 14 C atoms (including the C atoms of the carboxyl groups) and 2 to 6 Carboxyl groups. Dicarboxylic acids which together with diols lead to linear polyester diols or with triols to branched polyester triols are preferred. Conversely, branched polyester triols can also be obtained by reacting a diol with a tricarboxylic acid.
  • the alcohol component of the polyester polyol can be used, for example: ethylene glycol, 1, 2-propanediol, 1, 3-propanediol, the isomeric butanediols, pentanediols, hexanediols, 2,2-dimethyl-1, 3-propanediol, 2-methyl-propanediol, 1 , 6-hexanediol, 2,4,4-trimethylhexanediol-1,6-2,2,4-trimethylhexanediol-1,6-cyclohexanediol-1,4,4,4-cyclohexanedimethanol, or aromatic diols such as 4,4 '.
  • Suitable carboxylic acids are, for example: phthalic acid, isophthalic acid, terephthalic acid, maleic acid, dodecylmaleic acid, octadecenylmaleic acid, fumaric acid, aconic acid, 1, 2,4-benzenetricarboxylic acid, 1,2,3-propanetricarboxylic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, sebacic acid , Cyclohexane-1, 2-dicarboxylic acid, 1, 4-cyclohexadiene-1, 2-dicarboxylic acid and others.
  • carboxylic acids and their anhydrides can be used.
  • low molecular weight aliphatic diols for example C 2 to C 10 -diols. These may be linear, branched or cycloaliphatic diols. Examples thereof are ethylene glycol, 1, 2-propanediol, 1, 3-propanediol, 1, 2-butanediol, 1, 4-butanediol, hexanediols or octanediols and their isomers.
  • polyether polyols are suitable.
  • Low molecular weight polyethers should be selected, for example polyether polyols having a molecular weight of 150 to 4,000 g / mol, preferably 200 to 2,000 g / mol are suitable.
  • diols are suitable, such as homopolymers of polyethylene glycol, propylene glycol, block or random copolymers of ethylene glycol and propylene glycol. It is useful if the mixture of polyols is liquid at room temperature.
  • Such polyols are known to the person skilled in the art.
  • the suitable PU prepolymers are usually prepared by mixing the polyols with an excess of isocyanates. Reaction forms mixtures of various prepolymers and / or oligomers containing reactive NCO groups. These mixtures may also contain unreacted isocyanates. By the The amount of isocyanates used, the content of NCO groups and unreacted isocyanate can be adjusted. The preparation is known to the person skilled in the art.
  • the prepolymer composition of the invention may contain the usual additives, such as flame retardants, stabilizers, cell openers, catalysts and propellants.
  • flame retardants it is possible to use customary halogen-containing flame retardants, but also those based on phosphorus compounds, for example triethyl phosphate or dimethyl methane phosphonate.
  • polyester polyols are used as crosslinkers, such flame retardants can be added in smaller amounts.
  • catalysts it is possible to use all known compounds which can catalyze isocyanate reactions.
  • titanates such as tetrabutyl titanate; Tin carboxylates such as dibutyltin dilaurate (DBTL), tin octoate; Tin oxides such as dibutyltin oxide, and dioctyltin oxide; Organoaluminum compounds such as aluminum trisacetylacetonate; Chelate compounds such as titanium tetraacetylacetonate; Amine compounds such as triethylenediamine, guanidine, morpholine, N-methylmorpholine, 1,8-diazabicyclo- (5,4,0) -undecene-7 (DBU), ⁇ , ⁇ -dimethylpiperazine, 1,8-diazabicyclo [5.4.
  • titanates such as tetrabutyl titanate
  • Tin carboxylates such as dibutyltin dilaurate (DBTL), tin
  • the catalysts are preferably present in an amount of 0.01 to about 5% by weight, based on the total weight of the nonvolatile fractions.
  • Stabilizers for the purposes of this invention are to be understood as meaning antioxidants, UV stabilizers, hydrolysis stabilizers or foam stabilizers. Examples of these are the commercially available sterically hindered phenols and / or thioethers and / or substituted benzotriazoles and / or amines of the "HALS" type (hindered amine light stabilizer). It is preferred in the context of the present invention, when a UV stabilizer is used, which carries a silyl group and is incorporated in the final product during curing or curing. It is also possible to add benzotriazoles, benzophenones, benzoates, cyanoacrylates, acrylates or sterically hindered phenols.
  • foam stabilizers are polyethersiloxanes, such as copolymers of ethylene oxide and propylene oxide connected with a polydimethylsiloxane radical, polysiloxane-polyoxyalkylene copolymers branched via allophanate groups, other organopolysiloxanes loxanes, such as dimethylpolysiloxanes; oxyethylated alkylphenols, oxyethylated fatty alcohols, and / or paraffin oils.
  • the cell structure and / or for their stabilization are also suitable oligomeric polyacrylates with polyoxyalkylene and fluoroalkane as side groups.
  • the foamable mixtures according to the invention may contain stabilizers, for example in amounts ranging from 0.1 to 5% by weight, based on the mixture of non-volatile fractions.
  • organofunctional silanes such as hydroxy-functional, (meth) acryloxy-functional, mercapto-functional, amino-functional or epoxy-functional silanes can be used as adhesion promoters.
  • the amounts may be from 0 to 10 wt.%, Preferably between 0 and 5 wt.%, Based on the mixture.
  • the foamable composition suitable according to the invention may also contain at least one liquid flame retardant.
  • the flame retardant can be selected from the group halogenated (in particular brominated) ethers of the type "Ixol" from. Solvay, 3,4,5, 6-tetrabromo, 2- (2-hydroxyethoxy) ethyl-2-hydroxypropyl ester), organic phosphates, especially diethyl ethane phosphonate,
  • Triethyl phosphate, dimethylpropyl phosphonate, diphenyl cresyl phosphate, and chlorinated phosphates in particular tris (2-chloroethyl) phosphate, tris (2-chloroisopropyl) phosphate, tris (1,3-dichloroisopropyl) phosphate, tris (2,3-dibromopropyl) phosphate and Tetrakis (2-chloroethyl) ethylenediphosphate or mixtures thereof.
  • One embodiment selects those flame retardants which have no hydroxyl groups, since these reduce the content of reactive NCO groups.
  • the mixture contains the flame retardant in an amount of less than 30 wt .-%, preferably less than 10 wt .-%.
  • the viscosity of the composition without propellant can vary within wide limits, for example from 10,000 to 100,000 mPas (cone plate, 25 ° C). Preferably, low viscosities should be selected, in particular up to 50,000 mPas. This can also be influenced by the choice of isocyanates.
  • the viscosity of the PU prepolymers is a measure for influencing the sprayability.
  • parts of the blowing agents in the composition also dissolve under pressure. Irrespective of the fact that the viscosity in the dissolved state can not be measured reproducibly, the composition suitable for use in accordance with the invention has a composition To improve the sprayability so that it is assumed that the viscosity of the mixture is lowered during spraying.
  • a foamable composition suitable according to the invention comprises, in addition to the mixture of PU prepolymer, oligomers and / or isocyanates, at least one blowing agent.
  • a blowing agent can in principle a variety of volatile compounds are used, which are volatile at application temperature, for example at 20 ° C, and can evaporate.
  • Propellants are selected from hydrocarbons each having 1-5 carbon atoms and / or ethers having a molecular weight below 120 g / mol.
  • Non-polar blowing agents are understood to be the known readily volatile hydrocarbons having from 1 to 5 carbon atoms.
  • Polar blowing agents are understood as meaning those substances which have a considerable vapor pressure at 20 ° C. and exhibit a polarity. These are compounds which, in addition to hydrocarbon units, have further heteroatoms, in particular oxygen. Examples of such compounds are dimethyl ether (DME), diethyl ether, dimethoxymethane, dimethoxyethane, acetone.
  • DME dimethyl ether
  • diethyl ether dimethoxymethane
  • dimethoxyethane dimethoxyethane
  • acetone examples of such compounds.
  • Such polar blowing agents may be contained singly or in admixture. In one embodiment, halogen-containing propellants should be avoided.
  • the blowing agents are used, for example, in amounts of from 5 to 45% by weight, preferably from 10 to 30% by weight, based on the total foamable composition.
  • a high proportion of polar blowing agents should be used, these allow good sprayability.
  • more than 70% by weight, up to 90%, based on the amount of blowing agent, of polar blowing agents should be present.
  • Very particular preference is given to DME, acetone and / or dimethoxymethane as the polar blowing agent.
  • the foamable composition contains more than 70% by weight of a polar blowing agent based on the amount of the blowing agent and the spray is generated through a hole jet, a particularly uniform layer which foams after impact is obtained.
  • a preferred embodiment of the sprayable foam precursor suitable according to the invention may contain 70 to 99.8% by weight, preferably 75 to 98% by weight, of NCO-bearing reactive reaction products of polyols and isocyanates, in particular based on polyoxyalkylene diols, 0.2 to 30% by weight of additives, in particular catalysts, cell openers, adhesion promoters and / or stabilizers.
  • the composition should have an NCO content between 5 to 25%.
  • the total of these non-volatile constituents should be 100% by weight.
  • the composition of the invention still contains the above-mentioned inert blowing agents.
  • blowing agent based on the total composition
  • a mixture of DME / propane / isobutane / n-butane can be used, which contains at least 70 wt .-% DME.
  • compositions which can be used according to the invention are suitable for a spray application.
  • the foam precursors can be applied from the pressure vessel by a spray.
  • the composition is atomized when exiting the spray nozzle to individual spray particles.
  • the corresponding spray particles can then foam on the Sprühweg, it is also possible that the spray particles foam only when hitting the substrate to be coated.
  • the composition is a 1 K polyurethane composition.
  • This is applied from a 1-way pressure vessel in the form of a spray cone.
  • the composition is packaged in a suitable 1-way pressure vessel.
  • the pressurized containers used can be the aerosol cans customary in the field of polyurethane foams.
  • a hole nozzle is used. This may optionally be interchangeable, in order to replace this spray element at a partial emptying can.
  • the composition is sprayed.
  • a spray cone which consists of individual droplets. These can foam after sputtering, but at the latest they foam when hitting and forming the coating. This may depend on the spray removal happen.
  • the droplets have a size of 0.01 to 1 mm, they are discrete particles.
  • the spray removal can also be influenced by the spray pressure, for example, it can be from 10 cm to 50 cm.
  • the amount of coating applied depends on the application. It can be applied directly or it is applied in several layers. In this case, a uniform thickness can be obtained. This layer hardens together with the surrounding humidity. The foam structure is retained. By foaming, a cured layer has a density of 5 to 100 g / l, preferably 10 to 50 g / l.
  • the layer applied according to the invention is stable. Even on a vertically applied surface, a layer does not slip off.
  • the foamed coatings can be used as insulation.
  • Another field of application is the production of a coating which has improved fire protection.
  • the provision as a disposable pressure vessel is a simple application, even applications directly on site can be provided with a corresponding layer.
  • the apparatus required for the production of foamed coatings is reduced.
  • the product is sprayed through a hole nozzle (diameter 1 mm). A layer is applied over a spray distance of 25 cm. It will be discreet
  • Obtained foam particles which form a layer after impact. It forms a layer of about 0.5 g / cm 2 , this foams even further and crosslinked under normal environmental conditions.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé pour recouvrir des substrats avec une couche réticulable de mousse polyuréthane, avec une composition contenant un précurseur de mousse polyuréthane réactif et au moins un propulseur dans un récipient sous pression jetable. Cette composition est diffusée par projection sous forme de gouttelettes, et on obtient un moussage des gouttelettes après projection et/ou au moment de la formation de la couche, au moins une partie du propulseur comprenant du diméthyléther et/ou du diméthoxyméthane.
EP12812211.6A 2011-12-22 2012-12-18 Procédé servant à appliquer une couche de mousse polyuréthane Withdrawn EP2794224A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011089633A DE102011089633A1 (de) 2011-12-22 2011-12-22 Verfahren zur Applikation einer PU-Schaumschicht
PCT/EP2012/075946 WO2013092584A2 (fr) 2011-12-22 2012-12-18 Procédé servant à appliquer une couche de mousse polyuréthane

Publications (1)

Publication Number Publication Date
EP2794224A2 true EP2794224A2 (fr) 2014-10-29

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EP12812211.6A Withdrawn EP2794224A2 (fr) 2011-12-22 2012-12-18 Procédé servant à appliquer une couche de mousse polyuréthane

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CA3007762C (fr) * 2015-12-08 2022-10-18 Firestone Building Products Company, Llc Procede de fabrication de panneaux de construction en mousse a base d'isocyanate

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DE10108445A1 (de) 2001-02-22 2002-09-05 Basf Ag Druckbehälter enthaltend Umsetzungsprodukt zur Herstellung eines elastischen Schaumstoffes
DE10343745A1 (de) 2003-09-22 2005-04-21 Hennecke Gmbh Verfahren zur Herstellung von Polyurethan-Sandwichelementen
EP1798255A1 (fr) * 2005-12-14 2007-06-20 de Schrijver, Aster Diluant réactif pour mousses de polyuréthanne à un ou deux composants
DE102007048079A1 (de) * 2007-10-05 2009-04-09 Bayer Materialscience Ag Verfahren zur Herstellung von Polyurethan-Schäumen
DE102009045027A1 (de) * 2009-09-25 2011-03-31 Henkel Ag & Co. Kgaa Monomerarme Polyurethanschäume

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WO2013092584A3 (fr) 2013-08-08
WO2013092584A2 (fr) 2013-06-27
DE102011089633A1 (de) 2013-06-27

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