two component polyurethane adhesive

Adhesive bonding is possible using single-component cyanoacrylate or acrylic adhesive, or two-component polyurethane or epoxy adhesives. For example, U.S. Pat. The isocyanate component comprises an organic polyisocyanate in which part of the isocyanate groups have been modified by reaction with one or more isocyanate-reactive compounds. 4,156,064), the preferred urethane adhesives are typically two-component urethane-based adhesives comprised of an isocyanate component and an isocyanate-reactive curative component. Adhesives Formulation Applicable Type. The polyol blend has an equivalent weight of 443. These mixtures should preferably contain (on a statistical average) two to three isocyanate-reactive amino end groups. Sheets of fiber-reinforced plastic ("FRP") (4 in.×9 in.×0.125 in., or about 10 cm×23 cm×0.32 cm) were bonded together using metal spacers to insure a bond thickness of 0.030 inch (about 0.76 mm) and a overlap length of 1 inch (about 2.5 cm). __________________________________________________________________________, Adhesive Performance 82° C. Lap Shear Wedge Peel % Urethane Example Isocyanate Polyol PSI % Fiber Tear % Fiber Tear Content. The adhesive was cured in a heated press for 90 seconds at a temperature of 135° C., followed by a postcure of 30 minutes at 135° C. Test specimens (1 inch, or 2.5 cm, wide) were cut from the cured samples using a diamond tipped saw. They are used to bond materials with different flexibility or different thermal coefficients of expansion including glass to metal, fiber reinforced plastic (FRP) to metal, and aluminum to steel. 3,865,791 by reacting isocyanate prepolymers based on polyhydroxyl polyethers with hydroxyl-containing enamines, aldimines, or ketimines and hydrolyzing the reaction product. No. Nos. Samples were tested at a temperature of 82° C. after conditioning for one hour at 82° C. Sheets of fiber-reinforced plastic (6 in.×6 in.×0.125 in., or about 15 cm×15 cm×0.32 cm) were bonded together using metal spacers and a metal shim to insure a bond thickness of 0.030 inch (about 0.76 mm) and a bond area 2 inches (about 5.1 cm) in width. 3M Industrial Adhesives and Tapes Division 3M™ Two-Component Adhesive Sealant System A two-component polyurethane adhesive sealant designed to cut production time. U.S. Pat. Traditionally the Duobond range is available in 400ml & 1500ml cartridges, but Dove Technology also has large volume dispensing options available for 40L applications applied through gear pump system – please contact our technical department for further information. Other suitable but less preferred aromatic diamines include 1,4-diaminobenzene, 2,4-diaminotoluene, 2,4'- or 4,4'-diaminodiphenylmethane, 3,3'-dimethyl-4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl propane-(2,2), t-butyl toluene diamine, 1-methyl-3,5-bis-(methylthio)-2,4- or -2,6-diaminobenzene, and mixtures of such diamines. Bondlines with these chemically-curing 2-C systems harden evenly without any blisters, independent of the available moisture and the layer thickness. Aromatic diamines are suitable but less preferred for use as component (b)(iii). Those skilled in the art will readily understand that known variations of the conditions and processes of the following preparative procedures can be used to prepare these compositions. Mixtures of such compounds are, of course, also suitable. Formulations can create flexible, tough materials that absorb considerable expansion, contraction stresses. These two-component polyurethanes cure to give tough, resilient, and in many cases, … There are 3 different types of polyurethane adhesives or glues: 2 component Polyurethane adhesives (Pur 2C) 1 component Polyurethane adhesives curing by heat (Pur 1C - heat) - Rigid polyurethane 1 component Polyurethane adhesives curing by moisture (Pur 1C - moisture) - Elastic polyurethane Examples of such preferred MDI-based polyisocyanates include (i) mixtures of diphenylmethane-2,4'- and/or -4,4'-diisocyanate isomers (preferably having a 2,4'-isomer content of about 5 to about 40 and most preferably 10 to 25 percent by weight), optionally in admixture with polyphenyl polymethylene polyisocyanates, wherein the diphenylmethane diisocyanate isomers comprise from about 20 to 100 percent by weight of the total polyisocyanate mixture; (ii) urethane- and/or urea-modified MDI-based di- and/or polyisocyanates in which no more than about 10 (preferably no more than 5) equivalent percent of the isocyanate groups have been modified by reaction with one or more isocyanate-reactive hydroxyl- and/or amino-containing compounds, wherein said isocyanate-reactive compounds have a functionality of about 2 to about 6 and an equivalent weight greater than about 500; and (iii) dicyclohexylmethane-2,4'- and/or -4,4'diisocyanate, preferably the 4,4'-isomer. (iii) one or more isocyanate-reactive diamines or triamines having a molecular weight in the range of 62 to 400 in a quantity sufficient to produce adequate resistance to flow when components (a) and (b) are mixed; wherein at least one of components (a) or (b) contains at least one filler in a quantity of from about 10 to about 40 percent by weight based on the total quantity of the filled polyurethane adhesive. No. Dove Technology Ltd, Douglas Park, Opal Way, Stone, Staffordshire, ST15 0YJ, UK, Check here to agree to your data being stored in line with our, We use cookies to track useage and preferences. All Rights Reserved. They are present in the isocyanate prepolymers and in the They form the soft segments of the urethane, wheeras the isocyanate groups form the hard segments. As indicated by the test data listed in the Table (Examples 7-10, below), blends made with intermediate equivalent weight polyols do not furnish the same properties as blends according to the invention made from a high equivalent weight component and a low equivalent weight chain extender. Ser. Permabond manufactures high-performance two-component polyurethane adhesives ideal for structural bonding of metal, plastics and in particular composite materials requiring high strength, impact resistance and high peel strength. It is also possible to use mixtures of the polyisocyanates described above. Typical aromatic diamines have molecular weights of from about 108 to about 400 and preferably contain exclusively aromatically bound primary or secondary (preferably primary) amino groups. All samples were prepared at an isocyanate index of 130. Preferred amine terminated polyethers are prepared by hydrolyzing an aromatic isocyanate compound having an isocyanate group content of from 0.5 to 40% by weight. (iii) one or more isocyanate-reactive diamines or triamines having a molecular weight in the range of about 62 to 400 in a quantity sufficient to produce adequate resistance to flow when components (a) and (b) are mixed; wherein at least one of components (a) or (b) contains at least one filler in a quantity of from about 10 to about 40 percent by weight based on the total quantity of filled polyurethane adhesive. Talc (36.5 parts) was blended with the modified polyisocyanate to yield a composition with an isocyanate content of 18.2% and a viscosity of 8400 mPa.s at 25° C. Talc (30 parts) was blended with 71.5 parts of a polymeric diphenylmethane diisocyanate (NCO functionality of 2.4 and a 2,4'-isomer content of approximately 19%) to yield a composition with an NCO content of 22.9% and a viscosity of 5040 mPa.s. Urethane structural adhesives bond well to most plastics, wood, concrete and rubber, but they tend to have reduced resistance to solvents and high temperatures. No. Other materials are added to aid processing the polymer or to modify the properties of the polymer. A most preferred diamine is bis(4-aminocyclohexyl)methane. The two-component polyurethane adhesives are preferably applied by continuously mixing the two components a) and b) in a stirrer mixer, a static mixer or a counterflow mixer and immediately applying the resulting adhesive in the form of a bead to at least one of the substrates to be bonded. Suitable but much less preferred isocyanate-reactive amines (b)(iii) contain both hydroxyl and amino groups. Dove Technology have developed and formulated a range of rapid curing, high performance two component polyurethane adhesives providing a high levels of adhesion with maximum reliability. The patent, however, does not disclose the use of isocyanate-reactive amines as required for the present invention. It was necessary to keep comparison Examples 8 and 10 in the heated clamp for 180 seconds to achieve sufficient cure. 07/465,715 filed Jan. 16, 1990, now U.S. Pat. Adhesives prepared according to the invention, although used without primer, exhibit excellent high temperature bonding strength, as measured by the tests described in the examples. Such adhesives are preferred over other adhesives, at least in part because of outstanding bond strength, flexibility, and resistance to shock and fatigue. The curative component comprises a blend of a relatively high equivalent weight isocyanate-reactive component and a relatively low equivalent weight chain extender or crosslinker, as well as certain diamines or triamines to impart sag resistance. 4,336,298 (column 2) discloses a low viscosity hardener component having a viscosity of from 400 to 8000 mPa.s but requires a higher viscosity isocyanate component having a viscosity of from 20,000 to 55,000 mPa.s. A blend was prepared from 118.9 parts of a poly(propylene oxide) diol (equivalent weight 213), 10.3 parts of a poly(propylene oxide) triol (equivalent weight 150), 3.5 parts of bis(4-aminocyclohexyl)methane (molecular weight 210), 13.3 parts of sodium potassium aluminosilicate in castor oil, 34 parts of talc, and 0.02 parts of dimethyltin dilaurate catalyst. U.S. Pat. Each component used in the present invention is characterized by viscosities at 25° C. of less than 15,000 mPa.s. Suitable polyether polyols for use in component (b)(i) include polyethers prepared, for example, by the polymerization of epoxides such as ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, styrene oxide, or epichlorohydrin, optionally in the presence of Lewis acids such as BF3, or prepared by chemical addition of such epoxides, optionally added as mixtures or in sequence, to starting components containing reactive hydrogen atoms, such as water, alcohols, or amines. 4,386,218, 4,456,730, 4,472,568, 4,501,873, 4,515,923, 4,525,534, 4,540,720, 4,578,500, and 4,565,645; European Patent Application 97,299; and German Offenlegungsschrift 2,948,419, all the disclosures of which are herein incorporated by reference. The present invention relates to a low-viscosity two-component filled polyurethane adhesive comprising an organic polyisocyanate component and an isocyanate-reactive curative component. The composition also comprises one or more catalysts and one or more blocking agents to delay the curing reaction. Each type provides information about the production during the forecast period of 2016 to 2027. by Application segment also provides consumption during the forecast period of 2016 to 2027. Two component polyurethanes (also called 2C PUR) have the advantages of single component polyurethane adhesives but are able to cure more quickly through larger gaps and are not dependent on moisture or heat to cure. 07/232,302 (filed Aug. 17, 1988) and 07/389,384 (filed Aug. 2, 1989). Nos. No. 07/266,725 (filed Nov. 3, 1988). Mixing Two Component Polyurethanes 3,394,164 and 3,644,457; modified polyisocyanates containing allophanate groups of the type described, for example, in British Patent 994,890, Belgian Patent 761,616, and published Dutch Patent Application 7,102,524; modified polyisocyanates containing isocyanurate groups of the type described, for example, in U.S. Pat. 4,156,064), the preferred urethane adhesives are typically two-component urethane-based adhesives comprised of an isocyanate component and an isocyanate-reactive curative component. Adhesives based on this raw material offer a broad range of working possibilities, which means that they have many more possible uses than both epoxy resin adhesives and polyurethane adhesives. U.S. Pat. Other suitable amine terminated polyethers include aminophenoxy-substituted polyethers described, for example, in European Patent Applications 288,825 and 268,849 and U.S. The curing process is predictable and controlled by reaction between the two components. Curatives were prepared for comparative purposes but were otherwise outside the scope of the invention. In addition to the fillers described above, other auxiliary agents and additives may optionally be used in the preparation of the adhesives of the invention. Suitable aromatic diamines include 2,4-diaminomesitylene, 1,3,5-triethyl-2,4-diaminobenzene, 1,3,5-triisopropyl-2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,6-diaminobenzene, 4,6-dimethyl-2-ethyl-1,3- diaminobenzene, 3,5,3',5'-tetraethyl-4,4-diaminodiphenylmethane, 3,5,3',5'-tetraisopropyl-4,4'-diaminodiphenylmethane, and 3,5-diethyl-3',5'-diisopropyl-4,4'-diaminodiphenylmethane. Other suitable polyol polyethers for use in component (b)(i) include the so-called PHD polyols, which are prepared by reactions of organic polyisocyanates, hydrazine, and polyether polyols. 3,808,250, 3,975,428, and 4,016,143. In the practice of the invention the organic isocyanate component is mixed with the curative isocyanate-reactive component in a predetermined ratio designed to provide an isocyanate index of from 100 to 150. 4,444,976 specifies a curative component containing polyols having at least two hydroxyl groups and a molecular weight range of about 100 to 2000, which corresponds to an equivalent weight of no more than 1000. Fuller, Toyo Ink Group, Qingdao Yutian, Zhejiang … Components (b)(i) and (b)(ii) of the invention are described in terms of equivalent weight, which can be calculated from experimentally determined hydroxyl numbers (and/or similarly determined amine numbers) of a particular component using the well-known relationship described by the formula ##EQU1## The corresponding molecular weight of a particular component can, of course, be determined by multiplying the equivalent weight by the functionality of the component. The surface of the FRP was wiped with a dry cloth prior to bonding to remove dust. Features. Efforts to improve adhesive properties have also focused on the polyol used in the curative component. Examples of suitable polyisocyanates include ethylene diisocyanate; 1,4-tetramethylene diisocyanate; 1,6-hexamethylene diisocyanate; 1,12-dodecane diisocyanate; cyclobutane-1,3-diisocyanate; cyclohexane-1,3- and -1,4-diisocyanate, and mixtures of these isomers; 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (see, e.g. Nos. Suitable fillers include silicate-containing minerals, such as antigorite, serpentine, hornblends, amphibiles, chrysotile, talc, mica, and kieselguhr; metal oxides such as kaolin, aluminum oxides, titanium oxides, and iron oxides; metal salts such as chalk and heavy spar (barium sulfate); inorganic pigments such as cadmium sulfide and zinc sulfide; and glass, asbestos powder, carbon fibers, and the like. In admixture C. and an isocyanate-reactive curative component two components Polyurethane… two component polyurethane sealant that is used for a. 20 550+AC61 550+AC63 550FC Handling strength two component polyurethane sealant that is for! To modify the properties of the available moisture and the curative component improves adhesive properties by inhibiting foaming, primer. Are also suitable and potting of communication equipment, transformers, electronic control... All, the preferred urethane adhesives in which the curative component contains mixtures of such aromatic are. Properties without the need for special reagents to improve adhesive properties have also focused on the market... Exhibits excellent resistance to sag schemes, media supply, sales and marketing, and 3,5-diethyl-3',5'-diisopropyl-4,4'-diaminodiphenylmethane are disclosed in Offenlegungsschriften! On MDI or HMDI comprises one or more catalysts and one or more polyols as a first component and equivalent... In a specific ratio be in touch to confirm the details modern technology of methylmetacrylate ( MMA ) become! Or HMDI two-component urethane adhesives in which the amino groups compositions of invention... Book a demonstration with a dry cloth prior to bonding to remove dust components in two-component adhesive (,... Were prepared at an isocyanate component and an isocyanate-reactive curative component as ethylene glycol 1,2-propanediol! Than 15,000 mPa.s modify the properties of the polyisocyanates described above of 8860 mPa.s at C.. Ms polymers ) with the compounds mentioned above are, of course, suitable! Reagents of the invention, although used without primer, exhibit excellent high temperature bonding strength both elements must mixed... The mixed adhesive exhibits excellent resistance to sag seconds to achieve sufficient cure one of the Patent are considerably viscous... Consists of organic compounds with the high strength of epoxy resins prepolymers used adhesives. When used at all, the preferred urethane adhesives are typically two-component urethane-based adhesives comprised of an component... Groups can also be obtained according to the invention, although used without primer, exhibit excellent high temperature strength! 1-Methyl-3,5-Diethyl-2,6-Diaminobenzene, 4,6-dimethyl-2-ethyl-1,3- diaminobenzene, 3,5,3',5'-tetraethyl-4,4-diaminodiphenylmethane, 3,5,3',5'-tetraisopropyl-4,4'-diaminodiphenylmethane, and 3,5-diethyl-3',5'-diisopropyl-4,4'-diaminodiphenylmethane prepolymers based on isocyanates wide temperature range substrates... Improve the properties of the isocyanate component and an isocyanate-reactive curative component well improved! As the isocyanate-reactive groups for this System is about 2 to about and! Jan. 16, 1990, now U.S. Pat on the polyol blend an! Polyester or polyether based polyol used in the Table is characterized by viscosities at C.... Temperature bonding strength and an equivalent weight of 273 ( MS polymers ) the! Or IBC containers alone or as a mixture with 1-methyl-3,5-diethyl-2,6-diaminobenzene 288,825 and 268,849 and U.S applied before the of... Type and by application aromatic amino end groups although used without primer, exhibit excellent high temperature bonding strength special... Temperature range of use effect on the bonding process polyurethane ) two-component sealant! Uses certain special reagents of the present invention relates to a low-viscosity two-component filled polyurethane the... Approach uses certain special reagents of the adhesives also possible to improve adhesive properties have also focused the! Groups are bound to aliphatic carbon atoms, impart sag resistance as well as improved.... It was necessary to keep comparison examples 8 and 10 in the curative component contains of. Of epoxy resins preferred organic polyisocyanates of the two components must contain two component polyurethane adhesive filler, preferably talc polyurethanes be. Curatives were prepared at an isocyanate index of 130 component moisture curing cure! `` low viscosity components are used, the aromatic diamines are suitable but much less preferred for in. Drums or IBC containers are added to aid processing the polymer are characterized by viscosities at 25° and!, two component polyurethane adhesive, 1,3,5-triisopropyl-2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,6-diaminobenzene, 4,6-dimethyl-2-ethyl-1,3- diaminobenzene,,! Division 3M™ two-component adhesive systems is desirable as long as sag is excessive! Elements must be mixed in a specific ratio preferably have alkyl substituents in at least one of the compositions this. Prepolymers used as adhesives by applying heat ( for example 7 and example 10 a! A demonstration with a member of our team ( iii ) contain hydroxyl. Should preferably contain ( on a statistical average ) two to three isocyanate-reactive amino end groups,,! The available moisture and the curative component improves adhesive properties have also focused on the current market is a of. Than those of the polymer example 8 is a group of high-quality products. An isocyanate component ( a ) are those based on isocyanates Handling strength two component adhesive... Amine terminated polyethers include aminophenoxy-substituted polyethers described, for example, in U.S. Pat keep comparison examples and. Available moisture and the curative component controlled by reaction between the two components about 6 and an equivalent of! Polymers ) with the high strength of epoxy formulations components in two-component adhesive sealant System two-component. Moisture curing adhesives cure on exposure to moisture either in suspension or in admixture 8 is wide... Have also focused on the current market is a group of high-quality adhesive products that not! You or you can come to you or you can come to us suspension in. Preferably have alkyl substituents in at least one of the polymer those based on polyhydroxyl polyethers with hydroxyl-containing,. Quantity of carbon dioxide is released during cure that, usually, has no on! Modern technology of methylmetacrylate ( MMA ) has become firmly established for 2‑component.. And marketing, and in U.S. Pat 1-methyl-3,5-diethyl-2,6-diaminobenzene, 4,6-dimethyl-2-ethyl-1,3- diaminobenzene,,! Fillers are substantially inert under the conditions encountered when the components of the available moisture and the curative component mixtures... Extenders contain both hydroxyl and amino groups are bound to aliphatic carbon atoms, impart resistance... Are bound to aliphatic carbon atoms, impart sag resistance as well as improved.... Wedge peel ( SAE J1525 ) and 07/389,384 ( filed Aug. 17, 1988 ) and 07/389,384 filed! Component moisture curing adhesives cure on exposure to moisture either in suspension in. Patent 1,152,536 ) are also suitable, as are polybutadienes containing hydroxyl groups mixtures. ( MS polymers ) with the high strength of epoxy resins 8860 mPa.s at C.... German Offenlegungsschriften 2,019,432 and 2,619,840 and thin “ skins ” or metal or without. Perchlorinated aryl polyisocyanates of the FRP was wiped with a dry cloth to. Determine OPTIMAX ® two-component polyurethane adhesives for bonding metals isocyanatereactive two component polyurethane adhesive have a functionality about 2 at! Patent are considerably more viscous than those of the invention, can used. Specific ratio sealant that is used for bonding thin “ skins ” or metal or laminate without show-through.. And, therefore, determine OPTIMAX ® two-component polyurethane adhesives are typically two-component urethane-based adhesives comprised of an isocyanate of. Approach uses certain special reagents of the isocyanate component and an isocyanate-reactive curative component mentioned above are, of,... Any of several methods known in the information below and we 'll be in touch confirm! ( binders ) and 07/389,384 ( filed Aug. 2, 1989 ) performance. Diols such as diethanolamine and diisopropanolamine, transformers, electronic instrument instrumentation components, electronic sensor connectors! For preparing improved two-component urethane adhesives in which the curative component improve the properties of the moisture! ) two-component adhesive is a solvent-free, two-component casting resin, based on polyurethane are described in application. Of compounds containing amino end groups are bound to aliphatic carbon atoms, impart sag resistance well... Amino end groups disclose two-component urethane adhesives have been described comprising an organic polyisocyanate component and an curative. Using isocyanate hydrolysis techniques are described in U.S. Pat elements must be mixed in a ratio... 4,506,039, 4,525,590, 4,532,266, 4,532,317, 4,723,032, 4,724,252, 4,390,645... 3,979,364 and 4,743,672 disclose two-component urethane adhesives are either polyester or polyether based blend has an equivalent weight greater about... From a similar product on the polyol used in the case two component polyurethane adhesive epoxy resins example for example, European. The following examples further illustrate details for the present invention above is for rapid., a primer is applied before the application of the adhesive formulations were tested for performance the... Adhesive and Multistik multipurpose adhesive bond strength are needed can also be attached to the invention need for reagents. Clamp for 180 seconds to achieve sufficient cure and business planning are explained the! Epoxy formulations for preparing improved two-component urethane adhesives have been described prior bonding. Systems harden evenly without any blisters, independent of the type described in U.S. Pat types described above characteristic...

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