EP2920221A1 - Adhésif bicomposants à base de polyuréthane pour le collage de pièces façonnées renforcées de fibres - Google Patents

Adhésif bicomposants à base de polyuréthane pour le collage de pièces façonnées renforcées de fibres

Info

Publication number
EP2920221A1
EP2920221A1 EP13789589.2A EP13789589A EP2920221A1 EP 2920221 A1 EP2920221 A1 EP 2920221A1 EP 13789589 A EP13789589 A EP 13789589A EP 2920221 A1 EP2920221 A1 EP 2920221A1
Authority
EP
European Patent Office
Prior art keywords
polyol
component
weight
component polyurethane
polyurethane adhesive
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Withdrawn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
EP13789589.2A
Other languages
German (de)
English (en)
Inventor
Lothar Thiele
Dongmei SHEN
Oliver-Kei Okamoto
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 EP2920221A1 publication Critical patent/EP2920221A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C09J175/08—Polyurethanes from polyethers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/72—Measuring, controlling or regulating
    • B29B7/726—Measuring properties of mixture, e.g. temperature or density
    • 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
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/36—Hydroxylated esters of higher fatty acids
    • 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
    • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
    • C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
    • 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
    • C08G18/4804—Two or more polyethers of different physical or chemical nature
    • C08G18/4812—Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups
    • 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
    • C08G18/4829—Polyethers containing at least three hydroxy groups
    • 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
    • C08G18/487—Polyethers containing cyclic groups
    • C08G18/4879—Polyethers containing cyclic groups containing aromatic groups
    • 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
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
    • C08G18/6696—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes

Definitions

  • the invention relates to a 2-component adhesive based on polyurethanes, which has a high adhesive strength and a high glass transition temperature. Furthermore, this adhesive should have a sufficiently long processing time even at high ambient temperatures and also can bond substrates with uneven surfaces and bridges gaps or spaces firmly adhesive.
  • Two-component polyurethane adhesives based on polyols and polyisocyanates have been known for a long time.
  • Two-component polyurethane adhesives can advantageously cure after mixing of the components even at ambient temperature ("cold curing") and can therefore absorb quickly higher forces even after a short curing time.
  • structural adhesives For use as structural adhesives, however, high demands are made in terms of strength and bond strength to such adhesives, since such adhesives are elements of load-bearing structures.
  • High strengths are usually achieved by high crosslinking densities. This is very often achieved by increasing the concentration of functional groups and the use of higher functional polyols or polyamines and higher functional polyisocyanates. This can lead to embrittlement of the adhesive joint if the crosslinking density is too high.
  • WO2002 / 066572 A1 describes 2K PU adhesives for wood-based materials which contain up to 98% oleochemical polyols, 1 to 7.5% of a low molecular weight diol with an OH number between 400 and 2000, and 1 to 7.5%. a three- to five-functional polyol and further auxiliaries and a resin, wherein the adhesive is crosslinkable via polyisocyanates.
  • DE 10 2008 060 885 A1 discloses a solvent-free, 2-component adhesive for bonding sterilizable composite films, wherein the adhesive comprises a component A comprising at least one NCO-containing prepolymer prepared from low molecular weight polyether alcohols, polyester alcohols and / or polyalkylene alcohols Functionality of 2 or 3 reacted with a high molar excess of TDI and removal of the unreacted monomeric diisocyanate, and a component B containing at least one 2 or 3 functional polyester polyol prepared from diols and / or triols based on polyethers or polyalkylene diols reacted with dicarboxylic acids and their derivatives, wherein at least 10 to 40 wt .-% of aliphatic C8 to C20 dicarboxylic acids must be included, as well as auxiliaries and additives in at least one component A or B.
  • component A comprising at least one NCO-containing prepolymer prepared from low molecular weight polyether alcohols,
  • WO 2009/080740 A1 discloses a two-component polyurethane adhesive consisting of a polyol component containing 2 to 30 wt.% Of at least one polyester diol having a molecular weight of more than 1000 g / mol, 5 to 35 wt.% Of at least one 3 to 14 functional Polyols, 5 to 35 wt.% Hydrophobic polyols, 2 to 65 wt.% Further additives or auxiliaries, the sum should give 100%, and a crosslinking component of polyisocyanates in an NCO / OH ratio of 0.9: 1 to 1, 5: 1, wherein the crosslinked adhesive has a glass transition temperature (Tg) greater than 50 ° C.
  • Tg glass transition temperature
  • EP2468789 A1 describes two-component polyurethane compositions comprising castor oil, at least one alkoxylated aromatic diol, at least one polyol having from 5 to 8 hydroxyl groups, and at least one polyisocyanate. It is stated that these compositions should have a long "open time” (open time) and even after prolonged exposure to a high humidity environment (eg 70% relative humidity) even after 40 minutes, especially after 60 minutes, These two-component polyurethane compositions should be particularly suitable for use as structural adhesives, in particular for the bonding of wing half-shells of rotor blades for wind turbines, be bonded and cured to polymers with high mechanical strength and so a structural bonding is produced.
  • a high humidity environment eg 70% relative humidity
  • Such wing half shells are usually constructed of glass fiber reinforced plastic substrates and possibly metallic structural elements. These components must have a high mechanical stability, therefore, it is desirable that the corresponding adhesives can also absorb corresponding forces.
  • wing half shells there are a variety of other applications with similar requirements for such bonding of components. Examples are bonding of fiber-reinforced components for wings or other attachments of aircraft, the bonding of fiber-reinforced components in the marine industry or the aforementioned bonding of fiber-reinforced components for the production of blades for wind turbines.
  • the mechanical requirements for the bonded components are high. High tensile forces have to be absorbed, the load due to permanent vibrations is high and leads to material fatigue.
  • the object of the present invention is therefore to provide an adhesive with which plastic substrates can be glued together without pretreatment.
  • the adhesive is also at elevated ambient temperature and high humidity, such as occur in subtropical and tropical areas, for example, have a long open time or long pot life and have a high glass transition temperature after curing. Even under these conditions, a stable bond even on uneven surfaces should be ensured. In addition, foaming, blistering and / or too rapid skinning should be avoided even when processing at high humidity.
  • the crosslinked adhesive layers should be insensitive to moisture and different ambient temperatures and remain stable in their mechanical properties.
  • high glass transition temperature polyurethanes are made from short chain aliphatic polyols and aromatic polyisocyanates, but these have short pot lives or short open times.
  • An object of the invention are 2-component polyurethane adhesives consisting of a polyol component containing a) 2 to 30 wt.% Of at least one oleochemical polyol having a molecular weight greater than or equal to 500 g / mol, b) 5 to 35 wt.% Of at least one to 14 functional polyol, c) 5 to 35% by weight of at least one polyol based on ethoxylated or propoxylated polyphenols, d) 0 to 20% by weight of at least one further polyol, e) 2 to 65% by weight of at least one further additive , wherein the sum of a) to e) should give 100 wt.%, And an isocyanate component containing at least one aromatic and at least one aliphatic polyisocyanate in an NCO / OH ratio of 0.9: 1 to 1, 5: 1, wherein the crosslinked adhesive has a glass transition temperature (Tg) greater than or equal to
  • known shaped bodies of high-strength fiber composite materials are suitable. These may for example consist of glass fibers, carbon fibers or aramid fibers, which are embedded in a plastic matrix.
  • fibers may be incorporated into the matrix in the form of mats, fabrics, scrims, nonwovens or rovings.
  • This plastic matrix can consist, for example, of polyesters or epoxides which react via suitable hardeners and / or crosslinkers to give a thermosetting polymer.
  • fiber-reinforced substrates are known to the person skilled in the art. They are used, for example, in aircraft construction, boat building or other mechanically highly loaded components. A particular field of application of such bonded substrates are blades for wind power rotors. The production of such moldings are known.
  • Such wings are produced, for example, in molds and crosslinked.
  • the shape is often executed as a half-sided form.
  • the mold-facing side is generally obtained in a smooth, ready-to-use surface, and the other side can and should usually be processed.
  • two or more of these substrates are glued together in the further production of the wing.
  • As the side to be bonded the side facing away from the mold is generally used.
  • the surface should be formed so that the substrate parts to be bonded approximately have a fit.
  • the surface to be glued may be rough and uneven.
  • a grinding or milling to an exact mirror-image form to be bonded counterpart is not necessary according to the invention.
  • a pretreatment of the surfaces to be bonded is not necessary.
  • a grease-free surface is sufficient for applying the adhesive, the use of primers is not required.
  • One known mode of operation is such that the surfaces on the outer side of the mold parts are covered after manufacture of the parts in the mold for cross-linking with a tear-resistant protective fabric. This can be completely removed immediately before the subsequent bonding and thus give a suitable surface. But it is also possible to work these surfaces mechanically coarse and to adapt to the corresponding counterpart.
  • the adhesive of the invention can then be applied.
  • the adhesive should be applied at 15 to 50 ° C and 0 to 85% relative humidity (R.F.), but at least at 20 to 40 ° C and 20 to 85% r. F.
  • Curing should be possible at 60 to 90 ° C at least 70 to 80 ° C.
  • the bond should have a tensile shear strength of at least 12 MPa (determined according to DIN EN 1465: 2009-07), a peel resistance of at least 2 MPa (determined according to DIN EN ISO 1 1339: 2010-06), a tensile strength of> 40 MPa, an E-modulus of greater than or equal to 4,000 MPa and an elongation at break> 1% (each determined according to DIN EN ISO 527-2: 2012-06), even after moisture storage.
  • the heat distortion temperature should be at least 65 ° C, which means that the cured adhesive must have a glass transition temperature (Tg) greater than or equal to 65 ° C.
  • the glass transition temperature is determined by the Differential Scanning Calorimetry (DSC) method according to DIN EN ISO 1 1357-2: 1999.
  • the two-component PU adhesive according to the invention which fulfills the abovementioned requirements, is preferably pasty, but it can also show thixotropic properties in particular. It consists of a polyol component and an isocyanate component. These two components are mixed immediately before the application.
  • the polyol component must contain various polyfunctional polyols. This is intended to ensure sufficient crosslinking for a mechanically stable bond, even under thermal stress. By choosing the different polyols, it must also be ensured that a sufficient hydrophobicity of the adhesive is obtained.
  • the polyol component necessarily contains at least one compound from the amount of oleochemical polyols having a molecular weight greater than or equal to 500 g / mol (amount A), the amount of 3 to 14 functional polyols (amount B) and the amount of polyols based on ethoxylated or propoxylated polyphenols (amount C).
  • the amount C contains no polyols attributable to the amount A, and the amount B in turn does not contain any polyols attributable to the amount A or the amount C.
  • the polyol component may also contain polyols of the amount D which contains only polyols which are not assigned to any of the amounts A, B or C.
  • Oleochemical polyols in this invention are understood as meaning natural oils containing hydroxyl groups such as castor oil or polyols based on natural oils and fats, for example the reaction products of epoxidized fatty substances with mono-, di- or polyfunctional alcohols or glycerol esters of long-chain fatty acids. which are at least partially substituted by hydroxyl groups.
  • oleochemical polyols are ring-opening and transesterification products of epoxidized fatty acid esters of lower alcohols, ie of epoxidized fatty acid methyl, ethyl, propyl or butyl esters.
  • examples include the ring-opening or transesterification products with alcohols of functionality 2 to 4, in particular the reaction products with ethylene glycol, propylene glycol, oligomeric ethylene glycols, oligomeric propylene glycols, glycerol, trimethylolpropane or pentaerythritol.
  • dimer fatty acid such as dimer fatty acid diols, can be used.
  • the molecular weight of the oleochemical polyols to be used is greater than or equal to 500 g / mol. It is also possible to use mixtures of the abovementioned oleochemical polyols, these preferably having a hydroxyl equivalent weight of from 200 to 500 and an OH functionality of from 2.3 to 4.
  • the oleochemical polyols in the polyol component of the adhesive are from 2 to 30% by weight, preferably to 15 to 20 wt.% Included.
  • the molecular weight of a substance is understood to mean the number average molecular weight (M n ), determined by gel permeation chromatography (GPC) according to DIN EN ISO 16014-5: 2012-10.
  • the OH functionality of a compound means the mean OH functionality. It indicates the average number of hydroxyl groups per molecule.
  • the average OH functionality of a compound can be calculated based on number average molecular weight and hydroxyl number.
  • the hydroxyl value of a compound is determined according to DIN 53240-1: 2012-07, unless stated otherwise.
  • the quotient of the number average molecular weight and the OH functionality gives the hydroxyl equivalent weight of the compound.
  • the hydroxyl equivalent weight usually only the numerical value is given and the specification of the synonymously used units [g / Val], [g / eq] or [g / equ] is dispensed with.
  • a "3 to 14 functional polyol" is understood to mean a compound having an average of 3 to an average of 14 hydroxyl groups per molecule, ie a compound having an average OH functionality of 3 to 14.
  • As 3 to 14 functional polyols are preferably ethoxylation and / or propoxylation of trimethylolpropane, glycerol, polyglycerol, pentaerythritol, erythritol, sugar alcohols or hydrogenated sugar alcohols such as xylitol, dulcitol, mannitol or sorbitol or maltitol, of carbohydrates such as sucrose, dextrose, invert sugar, rhamnose , Lactose, trehalose, maltose, cellobiose, melibiose, gentiobiose, starch degradation products such as hydrogenated starch hydrolysates of mixtures thereof.
  • ethoxylation and propoxylation products having up to 15 alkylene oxide units can be used.
  • the preparation of such polyols is described, for example, in WO2012 / 134849 A1.
  • a suitable commercial product is, for example, Voranol RN 490, a reaction mass of propoxylated sucrose and propoxylated glycerol.
  • the non-alkoxylated sugar alcohols can be used.
  • the 3 to 14 functional polyols are contained in the polyol component of the adhesive at 5 to 35% by weight, preferably at 15 to 25% by weight.
  • Polyols based on ethoxylated or propoxylated polyphenols are, for example, ethoxylated or propoxylated bisphenol A, bisphenol B or bisphenol F.
  • propoxylation products of bisphenol A having a degree of propoxylation of 2, i. H.
  • each phenolic group is only reacted with one molecule of propylene oxide.
  • the ethoxylated or propoxylated polyphenols are contained in the polyol component at 5 to 20% by weight, preferably at 10 to 15% by weight.
  • polyester diols are suitable.
  • a suitable commercial product is, for example, Sovermol 1006.
  • the aromatic polyisocyanate of the isocyanate component may be isomerically pure 2,4'-diphenylmethane diisocyanate, isomerically pure 4,4'-diphenylmethane diisocyanate, a mixture of 2,4'-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate, a polymeric isocyanate based on 2, 4'- and 4,4'-diphenylmethane diisocyanate having an NCO functionality of 2.0 to 3.2 or a mixture of the aforementioned Diphenylmethandi- beocyanates.
  • a suitable commercial product is for example Lupranat MIS.
  • the aro- Matic polyisocyanate is contained in the isocyanate component of the adhesive to 40 to 70 wt.%, Preferably to 50 to 65 wt.% Contained.
  • the NCO functionality of a compound is understood to mean the average number of NCO groups per molecule.
  • the NCO functionality can be calculated from the number average molecular weight and the NCO content of the compound.
  • the NCO content is determined according to DIN EN ISO 1 1909: 2007-05.
  • aliphatic polyisocyanates are tetramethoxybutane-1,4-diisocyanate, butane-1,4-diisocyanate, hexane-1,6-diisocyanate (HDI), 1,6-diisocyanato-2,2,4-trimethylhexane, 1,6 Diisocyanato-2,4,4-trimethylhexane, 1, 12-dodecane diisocyanate (C 12 DI), isophorone diisocyanate (3-isocyanate-methyl-3,5,5-trimethylcyclohexylisocyanate, IPDI) and their reaction products with glycerol, trimethylolpropane and their Homopolymerisations- and Oligomerisations reside, in particular trimerization products, and in particular biuretization.
  • HDI hexane-1,6-diisocyanate
  • IPDI isophorone diisocyanate
  • trimerized hexamethylene diisocyanate preferably a biuretized hexamethylene diisocyanate (HDI), having an NCO functionality of 2.5 to 3.8.
  • a suitable commercial product is, for example, Desmondur N 3300.
  • the aliphatic polyisocyanate is contained in the isocyanate component of the adhesive at 20 to 45% by weight, preferably at 25 to 40% by weight.
  • the isocyanate component of the adhesive may still additives such. B. thixotropic and / or drying agent.
  • the additives should be selected so that they do not react with the polyisocyanates.
  • the two-component polyurethane adhesives according to the invention contain additives which are admixed with the polyol component and optionally with the isocyanate component.
  • the proportion of additives in the polyol component is 2 to 65 wt.%.
  • additives are fillers, leveling agents, deaerators, thixotropic agents, catalysts, stabilizers, anti-aging agents, dyes, color pastes, pigments, drying agents, resins, plasticizers and wetting agents.
  • Catalysts can also be used, for example when using aliphatic isocyanates.
  • organometallic compounds such as iron or especially tin compounds. Examples of these are 1, 3-dicarbonyl compounds of iron, such as iron (III) acetylacetonate, and in particular the organotin compounds of the 2- or 4-valent tin, in particular the Sn (II) carboxylates or dialkyl Sn (IV) -Dicarboxylates or the corresponding dialkoxylates, such as dibutyltin dilaurate, dibutyltin diacetate, dioctyltin diacetate, dibutyltin maleate, tin (II) octoate.
  • tertiary amines or amidines can be used as catalysts, optionally in combination with the abovementioned tin compounds.
  • Suitable amines are both acyclic and in particular cyclic compounds in question. Examples are tetramethylbutanediamine, bis (dimethylaminoethyl) ether, 1,4-diaza-bicyclooctane (DABCO), 1,8-diaza-bicyclo- (5.4.0) -undecene, 2,2'-dimorpholinodiethyl ether,
  • a preferred embodiment of the 2-component PU adhesive according to the invention operates without a catalyst.
  • the adhesive according to the invention may optionally additionally contain stabilizers.
  • Stabilizers for the purposes of this invention are to be understood as meaning antioxidants, UV stabilizers or hydrolysis 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).
  • resins may optionally be included. These may be natural resins or synthetic resins. Examples of these are shellac, rosin, tall resins, balsam resins or root resins, hydrocarbon, terpene, coumarone / indene, furan, alkyd, glycerol ester, urea, melamine, polyamide resins, in particular also aldehyde, ketone or phenolic resins.
  • the resins generally have a low melting point and are advantageous, inter alia, for improved compatibility of the components.
  • a particular embodiment employs OH-group-containing resins, in particular with several OH groups. These can then react with the isocyanates. In a preferred embodiment, the amount may be between 5 and 30% by weight.
  • fillers may be included. Suitable fillers are inorganic compounds which are not reactive towards isocyanates. Examples of suitable fillers and pigments are natural, ground chalk precipitated chalk, barite, talc, mica, carbon black, titanium dioxide, iron oxides, aluminum oxide, zinc oxide, zinc sulfate or silicon dioxide. It is also possible for water-absorbing powders, for example zeolite, to be present as filler.
  • the fillers should be finely distributed, for example from 1 to 200 ⁇ m, in particular up to 50 ⁇ m, but it may also be nanoscale pigments.
  • the amount of fillers and pigments should be from 0 to 60% by weight, in particular from 5 to 40% by weight. The amount of fillers affects the hardness of the crosslinked adhesive. Likewise, the quantity and selection of the filler can influence the viscosity.
  • the additives are preferably selected so that they do not undergo reactions or side reactions with the isocyanates, at least not in the period of the crosslinking reaction.
  • no additives should be added, for example carboxylic acids, which promote bubble formation in the adhesive.
  • the adhesive according to the invention should furthermore preferably contain no organic solvents, for example volatile at temperatures of up to 120 ° C. Plasticizers should also preferably not be present.
  • the ratio of the isocyanate groups contained in the isocyanate component to the OH groups contained in the polyol components is generally in the range of equivalence, with a slight excess of isocyanate groups being expedient with regard to moisture present on the surface.
  • the NCO / OH ratio is between 0.90: 1 and 1.5: 1, in particular 1.0: 1 to 1.3: 1.
  • the polyol component is first prepared.
  • the polyols may optionally be mixed with heating, then optionally solid fractions are to be dissolved in the mixture.
  • the additives are mixed and dispersed.
  • the moisture content should be kept low, for example, water can be reduced by the use of molecular sieves.
  • Inert additives may also be partially admixed with the isocyanate component. The two components are stored separately until their application. For use, these two components are mixed together in a conventional manner and the mixture is applied to the substrates to be bonded.
  • the adhesive of the invention should preferably be used at the processing temperature, i. between 10 to 40 ° C, have a liquid to pasty form. It should be able to be applied as a film or as a bead and not melt on the substrate.
  • the adhesive mixture according to the invention is in particular thixotropic.
  • an open time of more than 60 minutes is preferably achieved.
  • open time is understood to mean the period of time remaining after proper mixing of the 2K adhesive before the consistency of the adhesive has changed as a result of the onset of reaction, such as application, flow on the substrate, and good adhesion can be achieved.
  • the change in the adhesive composition can be done by intentional crosslinking reactions, but it can also adversely affect the pot life of side reactions. Under laboratory conditions, the so-called pot life can be determined to estimate the open time. The pot life is the period between complete mixing of the components and the beginning of the threading of the adhesive mixture.
  • a 4 cm high and 10 cm wide bead of adhesive should still be homogeneously compressible after application of the adhesive mixture within the open time, and bonds with high strengths must be formed.
  • This bead is applied to a GRP sheet of 3 mm thickness and pressed after predetermined times (40 min, 50 min, 60 min, 70 min, etc.) at 35 ° C and 70% relative humidity after placing a second GRP sheet.
  • the curing of the adhesive takes place in 24 h at 80 ° C. After preparation of test specimens, the tensile shear strength is determined.
  • the determined tensile shear strengths are compared with values derived from test specimens in which the compression takes place immediately after adhesive application. After a certain period of time curing has progressed so far that adequate compressibility is no longer present (hereinafter indicated by "-") or the tensile strength is so low that it is practically no longer available within the scope of measurement accuracy (hereinafter characterized by "-").
  • the open time is now the maximum time within which the bead is still homogeneously compressible and sufficient tensile strength exists.
  • Example 1 not according to the invention can be prolonged by an isocyanate component with aliphatic isocyanate in Example 2. However, this leads to a reduction of glass transition temperature and tensile strength below the claimed values. Only by the introduction of the aromatic polyol are obtained in Examples 3 and 4 according to the invention products with long pot lives and open times, high glass transition temperatures and tensile strengths.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

L'invention concerne un adhésif bicomposants à base de polyuréthane, constitué d'un composant polyol contenant a) 2 à 30% en poids d'au moins un polyol oléochimique de masse moléculaire égale ou supérieure à 500 g/mol, b) 5 à 35% en poids d'au moins un polyol tri- à tétradécafonctionel, c) 5 à 35% en poids au moins d'un polyol à base de polyphénols éthoxylés ou propoxylés, d) 0 à 20% en poids d'au moins un autre polyol, e) 2 à 65% en poids d'au moins un autre additif, la somme des composants a) à e) devant être égale à 100% en poids, ainsi que d'un composant isocyanate contenant au moins un polyisocyanate aromatique et au moins un polyisocyanate aliphatique selon un ratio NCO/OH de 0,9:1 à 1,5:1. L'adhésif réticulé présente une Tg supérieure ou égale à 65°C comporte. L'invention concerne en outre l'utilisation d'adhésifs de ce type.
EP13789589.2A 2012-11-14 2013-11-14 Adhésif bicomposants à base de polyuréthane pour le collage de pièces façonnées renforcées de fibres Withdrawn EP2920221A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012220772 2012-11-14
PCT/EP2013/073874 WO2014076206A1 (fr) 2012-11-14 2013-11-14 Adhésif bicomposants à base de polyuréthane pour le collage de pièces façonnées renforcées de fibres

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EP2920221A1 true EP2920221A1 (fr) 2015-09-23

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US (1) US20150247075A1 (fr)
EP (1) EP2920221A1 (fr)
CN (1) CN104837882A (fr)
BR (1) BR112015010741A2 (fr)
WO (1) WO2014076206A1 (fr)

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DE102017208511A1 (de) * 2017-05-19 2018-11-22 Henkel Ag & Co. Kgaa Polyurethan-basiertes Bindemittel-System
WO2019076843A1 (fr) * 2017-10-17 2019-04-25 Basf Se Colle polyurethanne bicomposant
FR3079840B1 (fr) * 2018-04-04 2020-11-20 Bostik Sa Composition a base de polyurethane
FR3079839B1 (fr) * 2018-04-04 2020-10-09 Bostik Sa Composition a base de polyurethane
EP3575336A1 (fr) * 2018-05-30 2019-12-04 Hexion GmbH Composition contenant du bisphénol f
CN109722206B (zh) * 2019-01-10 2021-05-25 广州吉必盛科技实业有限公司 双组分聚氨酯发泡胶及其制备方法
CN110776869B (zh) * 2019-06-21 2024-05-17 南京威邦新材料有限公司 一种耐高温高强度聚氨酯结构胶及其制备方法
CN112189042B (zh) * 2019-12-04 2022-05-03 杭州之江新材料有限公司 双组分聚氨酯粘合剂组合物及其粘合方法

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EP2468789A1 (fr) * 2010-12-24 2012-06-27 Sika Technology AG Adhésif destiné à des lames de rotor pour éoliennes
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SG193502A1 (en) 2011-03-31 2013-10-30 Dow Global Technologies Llc Method for producing short-chain polyfunctional polyether polyols utilizing superacid and double-metal cyanide catalysis

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Publication number Priority date Publication date Assignee Title
DE102016221843A1 (de) 2016-11-08 2018-05-09 Tesa Se Klebesystem aus mehreren Haftklebmasseschichten
WO2018086804A1 (fr) 2016-11-08 2018-05-17 Tesa Se Système adhésif constitué de plusieurs couches de matière autoadhésive

Also Published As

Publication number Publication date
CN104837882A (zh) 2015-08-12
WO2014076206A1 (fr) 2014-05-22
US20150247075A1 (en) 2015-09-03
BR112015010741A2 (pt) 2017-07-11

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