WO2017014185A1 - 接着剤組成物及びその製造方法 - Google Patents
接着剤組成物及びその製造方法 Download PDFInfo
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- WO2017014185A1 WO2017014185A1 PCT/JP2016/070995 JP2016070995W WO2017014185A1 WO 2017014185 A1 WO2017014185 A1 WO 2017014185A1 JP 2016070995 W JP2016070995 W JP 2016070995W WO 2017014185 A1 WO2017014185 A1 WO 2017014185A1
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- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
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- C09J175/12—Polyurethanes from compounds containing nitrogen and active hydrogen, the nitrogen atom not being part of an isocyanate group
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- C08G18/18—Catalysts containing secondary or tertiary amines or salts thereof
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- C08G18/22—Catalysts containing metal compounds
- C08G18/24—Catalysts containing metal compounds of tin
- C08G18/244—Catalysts containing metal compounds of tin tin salts of carboxylic acids
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- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- 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
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- C08G18/3893—Low-molecular-weight compounds having heteroatoms other than oxygen containing silicon
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- 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
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C08G18/72—Polyisocyanates or polyisothiocyanates
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- 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
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
Definitions
- the present invention relates to an adhesive composition and a method for producing the same.
- urethane resin compositions have been widely used as sealing agents, adhesives and the like.
- a urethane resin composition the use of a one-component moisture-curable polyurethane composition that is cured by moisture in the air, etc. in view of the fact that mixing adjustment of the composition in field construction is unnecessary and handling is easy. Is expanding.
- Patent Document 1 states that “(A) a urethane prepolymer, (B) a reaction product of a polyol having a molecular weight of 500 or less and a diisocyanate, and a polyisocyanate having 3 or more NCO groups in one molecule.
- Silane compound (B-1) obtained by adding an isocyanate compound and secondary aminoalkoxysilane, and lysine obtained by adding lysine isocyanate having two or three isocyanate groups and secondary aminoalkoxysilane Silane containing at least one NCO group on average and 1.5 or more average hydrolyzable alkoxy groups per molecule, including at least one selected from the group consisting of silane compounds having a skeleton (B-2)
- a one-component moisture-curable polyurethane composition containing a compound "is described Patent Document 1).
- Patent Document 1 describes that the composition may contain a curing accelerator such as dioctyltin dilaurate and dibutyltin laurate.
- the inventor produced a composition containing a compound having an alkyl group bonded to a tin atom, such as dioctyltin dilaurate and dibutyltin laurate, having 2 or more carbon atoms, with reference to Patent Document 1.
- a composition containing a compound having an alkyl group bonded to a tin atom such as dioctyltin dilaurate and dibutyltin laurate, having 2 or more carbon atoms
- Patent Document 1 When it evaluated using it with respect to the hard-to-bond coating board which does not use a primer, it became clear that the adhesiveness of such a composition and a hard-to-bond coating board may be low. Then, this invention makes it a subject to provide the adhesive composition excellent in adhesiveness with a hard-to-bond coating board.
- the present inventor contains a pre-composition obtained by mixing a urethane prepolymer, an aliphatic isocyanate A, and an aminosilane compound B, and a predetermined catalyst.
- a pre-composition obtained by mixing a urethane prepolymer, an aliphatic isocyanate A, and an aminosilane compound B, and a predetermined catalyst.
- a one-component moisture-curable adhesive composition comprising a dimethyltin catalyst represented by the following formula (1).
- X 1 and X 2 each independently represent a divalent hetero atom, and R 1 and R 2 each independently represent a hydrocarbon group that may have a hetero atom.
- the divalent heteroatom is at least one selected from the group consisting of an oxygen atom and a sulfur atom.
- X 1 and X 2 are sulfur atoms, 3.
- Aliphatic isocyanate A is at least one selected from the group consisting of a reaction product of hexamethylene diisocyanate and a tri- or higher functional polyol, hexamethylene diisocyanate allophanate, hexamethylene diisocyanate isocyanurate, and hexamethylene diisocyanate biuret. 6.
- a mixing step 1 in which a urethane prepolymer, an aliphatic isocyanate A and an aminosilane compound B are mixed to obtain a preliminary composition;
- An adhering step comprising mixing the preliminary composition and the dimethyltin catalyst represented by the above formula (1) to produce the adhesive composition according to any one of 1 to 7 (or 10) above A method for producing an agent composition.
- 12 12. The method for producing an adhesive composition according to 11 above, wherein in the mixing step 1, at least one selected from the group consisting of a filler and a plasticizer is further used.
- 13. 13 The method for producing an adhesive composition according to the above 11 or 12, wherein a tertiary amine is further used in the mixing step 2.
- the adhesive composition of this invention is excellent in adhesiveness with a difficult-to-adhere coating board. According to the production method of the present invention, it is possible to produce an adhesive composition that is excellent in adhesion to a hardly-adhesive coated plate.
- a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
- content of the said component refers to the total content of 2 or more types of substances.
- the adhesive composition of the present invention comprises: A preliminary composition obtained by mixing urethane prepolymer, aliphatic isocyanate A and aminosilane compound B; It is a 1 liquid moisture hardening type adhesive composition containing the dimethyltin catalyst represented by following formula (1).
- X 1 and X 2 each independently represent a divalent hetero atom, and R 1 and R 2 each independently represent a hydrocarbon group that may have a hetero atom.
- the adhesive composition of this invention takes such a structure, it is thought that a desired effect is acquired. The reason is not clear, but it is presumed that it is as follows.
- the predetermined dimethyltin catalyst is more active than the dioctyltin catalyst, and by containing the predetermined dimethyltin catalyst, the adhesive composition of the present invention has an active hydrogen other than water rather than curing of the adhesive itself by reaction with water.
- the present inventor presumes that a bond with (for example, a coated plate) is easily generated. Thereby, it is considered that the adhesive composition of the present invention is excellent in adhesiveness to difficult-to-adhere coating plates.
- the urethane prepolymer used in the adhesive composition of the present invention is not particularly limited as long as it is a urethane prepolymer having an isocyanate group at the terminal.
- polyisocyanate and a compound having two or more active hydrogen-containing groups in one molecule active hydrogen compound
- the isocyanate group of the polyisocyanate is excessive with respect to the active hydrogen-containing group of the active hydrogen compound.
- the reaction product can be used.
- the urethane prepolymer can contain 0.5 to 5% by mass of isocyanate groups at the molecular ends.
- the polyisocyanate used in the production of the urethane prepolymer is not particularly limited as long as it has two or more isocyanate groups in the molecule.
- the polyisocyanate include tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI; for example, 4,4′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate), 1,4-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate.
- Aromatic polyisocyanates such as xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), tolidine diisocyanate (TODI), 1,5-naphthalene diisocyanate (NDI), triphenylmethane triisocyanate; Hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMHDI), lysine diisocyanate, norbornane diisocyanate (NBDI), transcyclohexane-1,4-diisocyanate, isophorone diisocyanate (IPDI), bis (isocyanate methyl) cyclohexane (H 6 XDI) Aliphatic and / or cycloaliphatic polyisocyanates, such as dicyclohexylmethane diisocyanate (H 12 MDI); These carbodiimide-modified polyisocyanates; these car
- Polyisocyanate can be used individually or in combination of 2 or more types, respectively. Among these, aromatic polyisocyanate is preferable and MDI is more preferable because of excellent curability and good physical properties of the cured product.
- the compound (active hydrogen compound) which has two or more active hydrogen containing groups in 1 molecule used in the case of manufacture of a urethane prepolymer is not specifically limited.
- the active hydrogen-containing group include a hydroxyl group (OH) group, an amino group, and an imino group.
- a polyol compound having two or more hydroxyl (OH) groups in one molecule is preferably exemplified, and among them, a polyol compound is preferable.
- the polyol compound is not particularly limited as long as it is a compound having two or more hydroxy groups.
- polyether polyols for example, polyether polyols; polyester polyols; polymer polyols having a carbon-carbon bond in the main chain skeleton such as acrylic polyols, polybutadiene diols, and hydrogenated polybutadiene polyols; low molecular polyhydric alcohols; and mixed polyols thereof .
- polyether polyol is mentioned as one of the preferable aspects.
- polyether polyol examples include polyoxyethylene diol (polyethylene glycol), polyoxypropylene diol (polypropylene glycol: PPG), polyoxypropylene triol, ethylene oxide / propylene oxide copolymer, polytetramethylene ether glycol (PTMEG). , Polytetraethylene glycol, sorbitol-based polyol, and the like.
- the polyether polyol is preferably polypropylene glycol or polyoxypropylene triol from the viewpoint of excellent compatibility with the polyisocyanate.
- the weight average molecular weight of the polyether polyol is preferably 500 to 20,000 from the viewpoint that the viscosity of the urethane prepolymer obtained by the reaction with isocyanate has an appropriate fluidity at room temperature.
- the weight average molecular weight is a polystyrene conversion value obtained by GPC (gel permeation chromatography: abbreviation for Gel Permeation Chromatography) method (solvent: using tetrahydrofuran (THF)).
- the active hydrogen compounds can be used alone or in combination of two or more.
- the urethane prepolymer is preferably a urethane prepolymer obtained by reacting a polyether polyol and an aromatic polyisocyanate from the viewpoint of excellent adhesion and excellent curability, and reacts a polypropylene polyol and diphenylmethane diisocyanate.
- the urethane prepolymer obtained by this is more preferable.
- the urethane prepolymers can be used alone or in combination of two or more.
- the method for producing the urethane prepolymer is not particularly limited.
- polyisocyanate is used so that 1.5 to 2.5 mol of an isocyanate group reacts with respect to 1 mol of an active hydrogen-containing group (for example, a hydroxy group) of the active hydrogen compound, and these are mixed and reacted.
- an active hydrogen-containing group for example, a hydroxy group
- the urethane prepolymers can be used alone or in combination of two or more.
- the aliphatic isocyanate A used in the adhesive composition of the present invention is not particularly limited as long as it is an aliphatic hydrocarbon compound having at least one isocyanate group in one molecule.
- the aliphatic hydrocarbon group that the aliphatic isocyanate A has is not particularly limited. It may be linear, branched or cyclic, and is preferably linear.
- the aliphatic hydrocarbon group may be saturated or unsaturated, and is preferably saturated.
- the number of isocyanate groups that the aliphatic isocyanate A has in one molecule is preferably 2 or more, more preferably 2 to 3 from the viewpoint of superior adhesion.
- Aliphatic isocyanate A is hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMHDI), lysine diisocyanate, norbornane diisocyanate (NBDI), transcyclohexane-1,4-diisocyanate, isophorone diisocyanate (IPDI), bis (isocyanate methyl).
- HDI hexamethylene diisocyanate
- TMHDI trimethylhexamethylene diisocyanate
- NBDI norbornane diisocyanate
- IPDI isophorone diisocyanate
- bis isocyanate methyl
- Aliphatic polyisocyanates such as cyclohexane (H 6 XDI) and dicyclohexylmethane diisocyanate (H 12 MDI) (excluding modified products; hereinafter, the above aliphatic polyisocyanate may be referred to as aliphatic polyisocyanate b); aliphatic Examples include modified polyisocyanates.
- Aliphatic isocyanate A is superior in adhesiveness, and particularly has a wide range of adhesiveness due to differences in environment during curing (that is, excellent in adhesiveness regardless of differences in environment during curing (eg, temperature environment)).
- a modified product of an aliphatic polyisocyanate is preferred.
- the modified product of the aliphatic polyisocyanate is a reaction product of a trifunctional or higher functional polyol and an aliphatic polyisocyanate, an allophanate of an aliphatic polyisocyanate, a fat, from the viewpoint of excellent adhesion and physical property balance of the adhesive after curing. It is preferably at least one aliphatic isocyanate-modified product a selected from the group consisting of an isocyanurate of an aliphatic polyisocyanate and a biuret of an aliphatic polyisocyanate.
- the aliphatic polyisocyanate used in the modified aliphatic isocyanate a is not particularly limited as long as it is an aliphatic hydrocarbon compound having at least two isocyanate groups in one molecule.
- the thing similar to aliphatic polyisocyanate b is mentioned.
- linear aliphatic polyisocyanates are preferable, and HDI is more preferable, from the viewpoint that the adhesiveness is excellent and foaming hardly occurs due to the addition amount.
- reaction product of a trifunctional or higher polyol and an aliphatic polyisocyanate examples include a reaction product of a trifunctional polyol such as trimethylolpropane (TMP) or glycerin and an aliphatic polyisocyanate b (for example, HDI). It is done.
- a reaction product of TMP and HDI for example, a compound represented by the following formula (5)
- a reaction product of glycerin and HDI for example, a compound represented by the following formula (6).
- Examples of the allophanate body of aliphatic polyisocyanate include HDI allophanate body.
- biuret body of the aliphatic polyisocyanate examples include an HDI biuret body.
- a compound represented by the following formula (7) is preferably exemplified.
- Examples of the isocyanurate form of the aliphatic polyisocyanate include an HDI isocyanurate form. Specifically, the compound represented by following formula (8) is mentioned, for example.
- the aliphatic isocyanate A is preferably an HDI biuret or HDI isocyanurate, and more preferably an HDI biuret from the viewpoint of excellent heat-resistant adhesion and piping stability.
- the production of the aliphatic isocyanate A is not particularly limited. For example, a conventionally well-known thing is mentioned.
- the aliphatic isocyanate A can be used alone or in combination of two or more.
- the amount of the aliphatic isocyanate A is preferably 0.8 to 15 parts by mass with respect to 100 parts by weight of the urethane prepolymer, from the viewpoint of excellent adhesion and excellent physical properties of the cured product.
- the amount is more preferably 10 parts by mass, and even more preferably 3.0 to 8.0 parts by mass.
- the aminosilane compound B used in the adhesive composition of the present invention is a compound having at least one selected from the group consisting of an amino group (—NH 2 ) and an imino group (—NH—) and a hydrolyzable silyl group. If it is, it will not be restrict
- the amino group or imino group and the hydrolyzable silyl group can be bonded via an organic group.
- the group bonded to the imino group is preferably an aromatic hydrocarbon group.
- the aromatic hydrocarbon group is not particularly limited as long as it is a hydrocarbon group having at least an aromatic ring. Examples of the aromatic ring include a benzene ring and a naphthalene ring.
- the aromatic ring may have a substituent. Examples of the substituent include an alkyl group.
- hydrolyzable silyl group examples include those in which at least one hydrolyzable group is bonded to one silicon atom. When one or two hydrolyzable groups are bonded to one silicon atom, other groups that can be bonded to the silicon atom are not particularly limited. For example, a hydrocarbon group is mentioned. The hydrocarbon group is not particularly limited, but an alkyl group is preferable. Examples of the hydrolyzable silyl group include an alkoxysilyl group.
- Specific examples include a methoxysilyl group (monomethoxysilyl group, dimethoxysilyl group, trimethoxysilyl group) and ethoxysilyl group (monoethoxysilyl group, diethoxysilyl group, triethoxysilyl group).
- the organic group is not particularly limited.
- the hydrocarbon group which may have a hetero atom like an oxygen atom, a nitrogen atom, and a sulfur atom is mentioned.
- the hydrocarbon group include an aliphatic hydrocarbon group (which may be linear, branched or cyclic, may have an unsaturated bond), an aromatic hydrocarbon group, or these. The combination of is mentioned. At least one of the carbon atom or hydrogen atom of the hydrocarbon group may be replaced with a substituent.
- an aliphatic hydrocarbon group is preferable.
- the aminosilane compound B is preferably a compound having an alkoxysilyl group and an imino group in one molecule from the viewpoint of excellent adhesion, excellent storage stability of the adhesive, and droop resistance. More preferably, it is a compound having an alkoxysilyl group and an imino group to which an aromatic hydrocarbon group is bonded, and has an alkoxysilyl group and an imino group to which an aromatic hydrocarbon group is bonded in one molecule, More preferably, it is a compound in which an alkoxysilyl group and an imino group are bonded via an aliphatic hydrocarbon group.
- Examples of the aminosilane compound B include compounds represented by the following formula (I).
- R 1 represents an aromatic hydrocarbon group
- n is 0 or 1
- R 2 represents a divalent aliphatic hydrocarbon group
- at least one of three R 3 is alkoxy
- the three R 3 groups may be the same or different. When one or two of the three R 3 are alkoxy groups, the remaining R 3 is preferably an alkyl group.
- Examples of the aromatic hydrocarbon group include a phenyl group.
- Examples of the divalent aliphatic hydrocarbon group include a methylene group, an ethylene group, a propylene group, and a trimethylene group.
- Examples of the alkoxy group include a methoxy group and an ethoxy group.
- Examples of the alkyl group include a methyl group and an ethyl group.
- aminosilane compound B examples include N-phenyl-3-aminopropyltrimethoxysilane and N-phenyl-3-aminopropyltriethoxysilane.
- the aminosilane compound B is not particularly limited for its production. For example, a conventionally well-known thing is mentioned.
- the aminosilane compounds B can be used alone or in combination of two or more.
- the amount of the aminosilane compound B is preferably 0.1 to 10 parts by mass with respect to 100 parts by weight of the urethane prepolymer, from the viewpoint of excellent adhesion and excellent storage stability of the uncured product.
- the amount is more preferably 3 to 5 parts by mass, and still more preferably 0.8 to 3 parts by mass.
- the preliminary composition may further contain a filler.
- a filler In such a case, the thixotropy of the adhesive, the deep curability after application of the adhesive, and the physical properties after curing are excellent.
- the filler is not particularly limited. One preferred embodiment is that the filler is at least one selected from the group consisting of carbon black and white filler.
- the filler may be subjected to a surface treatment with a surface treatment agent such as a fatty acid, a resin acid, a urethane compound, or a fatty acid ester.
- Carbon black is not particularly limited. For example, a conventionally well-known thing is mentioned.
- the amount of carbon black is preferably 10 to 150 parts by weight, more preferably 30 to 100 parts by weight, based on 100 parts by weight of the urethane prepolymer, from the viewpoint of excellent droop resistance and physical properties of the cured product. More preferred.
- Examples of the white filler include calcium carbonate such as heavy calcium carbonate, precipitated calcium carbonate (light calcium carbonate) and colloidal calcium carbonate; magnesium carbonate, zinc carbonate; fumed silica, calcined silica, precipitated silica, and ground silica. And silica such as fused silica; diatomaceous earth; iron oxide, zinc oxide, titanium oxide, barium oxide, magnesium oxide; waxite clay, kaolin clay, and calcined clay.
- calcium carbonate such as heavy calcium carbonate, precipitated calcium carbonate (light calcium carbonate) and colloidal calcium carbonate
- magnesium carbonate zinc carbonate
- fumed silica calcined silica, precipitated silica, and ground silica.
- silica such as fused silica; diatomaceous earth; iron oxide, zinc oxide, titanium oxide, barium oxide, magnesium oxide; waxite clay, kaolin clay, and calcined clay.
- the amount of the white filler is preferably 5 to 80 parts by mass and more preferably 10 to 50 parts by mass with respect to 100 parts by mass of the urethane prepolymer, from the viewpoint of excellent deep part curability during curing. preferable.
- the preliminary composition may further contain a plasticizer.
- a plasticizer examples include diisononyl phthalate (DINP); dioctyl adipate, isodecyl succinate; diethylene glycol dibenzoate, pentaerythritol ester; butyl oleate, methyl acetylricinoleate; tricresyl phosphate, trioctyl phosphate; propylene glycol adipate
- DINP diisononyl phthalate
- dioctyl adipate isodecyl succinate
- diethylene glycol dibenzoate pentaerythritol ester
- butyl oleate methyl acetylricinoleate
- tricresyl phosphate trioctyl phosphate
- propylene glycol adipate examples include polyester and adipate butylene glycol polyester.
- the plasticizers can be used alone
- the amount of the plasticizer is preferably 5 to 100 parts by mass, more preferably 10 to 50 parts by mass with respect to 100 parts by mass of the urethane prepolymer, from the viewpoint of excellent viscosity and physical property control and coating properties. preferable.
- the preliminary composition is produced by mixing urethane prepolymer, aliphatic isocyanate A and aminosilane compound B. That is, in this invention, a preliminary composition contains a urethane prepolymer, aliphatic isocyanate A, and aminosilane compound B. The preliminary composition may further contain at least one selected from the group consisting of a filler and a plasticizer. In the preliminary composition, the urethane prepolymer and the aminosilane compound B may react. Moreover, aliphatic isocyanate A and aminosilane compound B may react.
- the pre-composition can further include a reaction product obtained by reacting the aminosilane compound B with the aliphatic isocyanate A and / or a reaction product obtained by reacting the aminosilane compound B with the urethane prepolymer after mixing.
- the dimethyltin catalyst contained in the adhesive composition of the present invention is a compound represented by the following formula (1).
- X 1 and X 2 each independently represent a divalent hetero atom
- R 1 and R 2 each independently represent a hydrocarbon group that may have a hetero atom.
- Examples of the divalent hetero atom include an oxygen atom and a sulfur atom.
- Examples of the hetero atom that the hydrocarbon group may have include an oxygen atom, a nitrogen atom, and a sulfur atom.
- Examples of the hydrocarbon group include an aliphatic hydrocarbon group (which may be linear, branched or cyclic, may have an unsaturated bond), an aromatic hydrocarbon group, or these. The combination of is mentioned. At least one of the carbon atom or hydrogen atom of the hydrocarbon group may be replaced with a substituent. Examples of the substituent include a carbonyl group and an ester bond. Of the carbon atoms possessed by the hydrocarbon group, carbon atoms located at positions other than both ends of the hydrocarbon group may be replaced with a substituent.
- the dimethyltin catalyst is excellent in catalytic activity and can suppress an increase in the viscosity of the composition after storage.
- X 1 and X 2 are oxygen atoms
- R 1 and R 2 are carbonyl.
- a dimethyltin dicarboxylate which is an alkyl group having a group and in which the oxygen atom is bonded to the carbonyl group to form an ester bond is preferable.
- dimethyltin dicarboxylate examples include dimethyltin dicarboxylate represented by the following formula (2).
- R 3 and R 4 each independently represents a hydrocarbon group.
- the hydrocarbon group is the same as the hydrocarbon group represented by R 1 and R 2 .
- Specific examples of dimethyltin dicarboxylate include dimethyltin dilaurate represented by the following formula (2-1); dimethyltin dioctate represented by the following formula (2-2).
- X 1 and X 2 are each a sulfur atom, and R 1 and R 2 are preferably a thio-based dimethyltin catalyst which is an unsubstituted or alkyl group having an ester bond. In this case, R 1 and R 2 may be the same or different.
- R 1 and R 2 are unsubstituted or alkyl groups having an ester bond, that R 1 and R 2 are unsubstituted alkyl groups, or R 1 and R 2 are ester bonds. It means that it is an alkyl group having. In the alkyl group having an ester bond, at least one carbon atom of the alkyl group may be replaced with a substituent. Examples of the substituent include a carbonyl group and an ester bond. Of the carbon atoms possessed by the alkyl group, carbon atoms located at positions other than both ends of the alkyl group may be replaced with a substituent.
- Dimethyltin dimercaptide As the thio-based dimethyltin catalyst in which X 1 and X 2 are sulfur atoms and R 1 and R 2 are unsubstituted alkyl groups in the formula (1), for example, dimethyltin dimercaptide Is mentioned.
- dimethyltin dimercaptide examples include dimethyltin dimercaptide represented by the following formula (3).
- R 3 and R 4 each independently represents a hydrocarbon group.
- the hydrocarbon group is the same as the hydrocarbon group represented by R 1 and R 2 .
- dimethyltin dimercaptide examples include dimethyltin didecadecyl mercaptide and dibutyltin dioctayl mercaptide represented by the following formula (3-1).
- Dimethyltin dithioglycolate As the dimethyltin catalyst in which X 1 and X 2 are sulfur atoms and R 1 and R 2 are alkyl groups having an ester bond in the formula (1), for example, dimethyltin dithioglycolate is Can be mentioned.
- dimethyltin dithioglycolate examples include dimethyltin dimercaptide represented by the following formula (4).
- R 3 and R 4 each independently represents a hydrocarbon group.
- the hydrocarbon group is the same as the hydrocarbon group represented by R 1 and R 2 .
- dimethyltin dithioglycolate examples include dimethyltin bis (2-ethylhexylthioglycolate) represented by the following formula (4-1).
- the dimethyltin catalyst is not particularly limited for its production. For example, a conventionally well-known thing is mentioned. Moreover, a dimethyltin catalyst can be used individually or in combination of 2 types or more, respectively.
- the content of the dimethyltin catalyst is 0.0005 to 1.0 mass with respect to 100 parts by mass of the urethane prepolymer, from the viewpoint of excellent adhesiveness, curability, storage stability of uncured material, and piping stability. Parts, preferably 0.005 to 0.5 parts by mass, more preferably 0.01 to 0.3 parts by mass.
- the adhesive composition of the present invention can further contain a tertiary amine.
- a tertiary amine for example, trimethylamine, triethylamine, tripropylamine, tributylamine, triamylamine, trihexylamine, trioctylamine, trilaurylamine, dimethylethylamine, dimethylpropylamine, dimethylbutylamine, dimethylamylamine, Linear amines such as dimethylhexylamine, dimethylcyclohexylamine, dimethyloctylamine, dimethyllaurylamine, triallylamine, tetramethylethylenediamine, tetramethylbutanediamine, triethanolamine; Triethylenediamine, N-methylmorpholine, 4,4 ′-(oxydi-2,1-ethanediyl) bis-morpholine, N, N-dimethylaminoethylmorpholine, pyridine, pico
- the tertiary amines can be used alone or in combination of two or more.
- N, N-dimethylaminoethyl morpholine and dimorpholino diethyl ether are preferable because the film-forming property at the time of application is good and the balance between storage stability and curing speed is good. Is preferred.
- the content of the tertiary amine is 0.01 to 2.0 parts by mass with respect to 100 parts by mass of the urethane prepolymer, from the viewpoint of excellent adhesiveness and excellent storage stability and curability of the adhesive. Is preferred.
- the adhesive composition of the present invention is, for example, an isocyanate compound other than the aliphatic isocyanate A, a silane coupling agent other than the aminosilane compound B, a dimethyltin catalyst, and a tertiary, as long as the purpose of the present invention is not impaired.
- additives such as a dehydrating agent and an antistatic agent can be further contained. The amount of the additive can be appropriately determined.
- Examples of the method for producing the adhesive composition of the present invention include the method for producing the adhesive composition of the present invention described later.
- the adhesive composition of the present invention is a one-component type.
- the adhesive composition of the present invention can be moisture cured. For example, it can be cured under conditions of ⁇ 20 to + 50 ° C. by atmospheric humidity.
- the adhesive composition of the present invention is excellent in adhesion to a hardly-adhesive coated plate even at an environmental temperature as low as ⁇ 20 ° C. to + 5 ° C.
- the adherend to which the adhesive composition of the present invention can be applied is not particularly limited.
- metal including a coated plate
- plastic including a coated plate
- rubber can be used.
- the adhesive composition of the present invention can be applied to an adherend without using a primer for the adherend.
- the adhesive composition of the present invention can be used for difficult-to-adhere coating plates.
- the paint applied to the hardly adhesive coating plate For example, acrylic / silane-based paints can be mentioned.
- the A / B paint means A paint and B paint.
- the paint applied to the hardly-adhesive coating plate is, for example, an acrylic / silane-based paint
- the paint applied to the hardly-adhesive coating plate is an acrylic paint or a silane-based paint.
- the adhesive composition of this invention is excellent in the adhesiveness with respect to coating plates other than a difficult adhesion coating plate.
- the coating plates other than the hard-to-bond coating plates There are no particular restrictions on the coating plates other than the hard-to-bond coating plates. For example, a conventionally well-known thing is mentioned.
- the coating used for coating plates other than the difficult-to-adhere coating plates include urethane coatings, acid / epoxy coatings, and acrylic / melamine coatings.
- the manufacturing method of the adhesive composition of this invention is demonstrated below.
- the manufacturing method of the adhesive composition of the present invention (the manufacturing method of the present invention) A mixing step 1 in which a urethane prepolymer, an aliphatic isocyanate A and an aminosilane compound B are mixed to obtain a preliminary composition; It is the manufacturing method of an adhesive composition which has the mixing process 2 which mixes a preliminary composition and the dimethyltin catalyst represented by said Formula (1), and manufactures the adhesive composition of this invention.
- a urethane prepolymer, an aliphatic isocyanate A, and an aminosilane compound B are mixed to obtain a preliminary composition.
- the urethane prepolymer, aliphatic isocyanate A, and aminosilane compound B used in the mixing step 1 are the same as described above.
- the mixing step 1 at least one selected from the group consisting of a filler and a plasticizer can be used.
- the urethane prepolymer, the aliphatic isocyanate A, and the aminosilane compound B are first mixed, and this is composed of the filler and the plasticizer.
- You may manufacture a preliminary composition by adding at least 1 sort (s) chosen from a group. Further, the preliminary composition may be produced by simultaneously mixing urethane prepolymer, aliphatic isocyanate A, aminosilane compound B, and at least one selected from the group consisting of fillers and plasticizers.
- a pre-composition may be produced by mixing urethane prepolymer, plasticizer, and aliphatic isocyanate A, adding and mixing aminosilane B, and then adding and mixing filler. .
- the mixing step 1 for example, a vertical mixer or a horizontal mixer can be used.
- the mixing temperature in the mixing step 1 is preferably 40 to 90 ° C.
- the mixing step 1 is preferably performed under reduced pressure.
- the mixing step 2 the preliminary composition and the dimethyltin catalyst are mixed to produce the adhesive composition of the present invention.
- the dimethyltin catalyst used in the mixing step 2 is the same as the dimethyltin catalyst represented by the above formula (1).
- the mixing step 2 for example, a vertical mixer or a horizontal mixer can be used.
- the mixing temperature in the mixing step 2 is preferably 40 to 70 ° C.
- the mixing step 2 is preferably performed under reduced pressure.
- the additive can be appropriately added in the mixing step 1 and / or 2.
- the adhesive composition of the present invention further contains a tertiary amine, it is mentioned as one of preferred embodiments that the tertiary amine is used in the mixing step 2.
- each component shown in the following mixing step 1 in Table 1 was used in the composition (parts by mass) shown in the same table, and these components were mixed with a horizontal mixer under the conditions of 40 to 70 ° C. and 2 kPa or less. Mixing for a time to produce a pre-composition.
- the preliminary composition produced as described above was used in the mixing step 2 as it was.
- the isocyanate compound, the silane compound, and each component other than the urethane prepolymer shown in Table 2 were simultaneously added to and mixed with the urethane prepolymer shown in Table 2.
- each component shown in the mixing step 2 in Table 1 below was used in the preliminary composition in the composition (parts by mass) shown in the same table, and these were mixed at 40 to 70 ° C. and 2 kPa using a horizontal mixer.
- a composition was prepared by mixing under the following conditions.
- Heat resistant adhesive (Preparation of heat resistant adhesive evaluation sample)
- One glass (length 25 mm ⁇ width 100 mm ⁇ thickness 8 mm, primer-treated, primer is trade name MS-90, manufactured by Yokohama Rubber Co., Ltd.) was prepared as an adherend.
- Each composition produced as described above was applied to the glass at room temperature. After coating, the composition on each glass is pressure-bonded to a thickness of 5 mm, cured for 72 hours under conditions of 23 ° C. and 50% relative humidity, and then left in a 120 ° C. environment for 7 days to give a sample for evaluating heat-resistant adhesion. It was.
- the composition manufactured as described above should not enter air into the hose (diameter 5 mm, length 20 cm, trade name Chuko Flow Tube, manufactured by Chuko Kasei Co., Ltd., polytetrafluoroethylene (PTFE)). After filling, the hose was sealed, and the sealed hose was placed at 50 ° C. for 1 week. One week later, the hose was returned to room temperature, the center of the hose was cut off, the uncured composition was removed from the hose, and the inside of the hose was observed. The case where the composition did not remain in the hose was evaluated as being excellent in piping stability, and this was indicated as “ ⁇ ”.
- the thickness of the cured composition from any point on the inner surface of the hose toward the center of the cut surface of the hose at the cut surface of the hose was measured. The greater the thickness, the lower the piping stability.
- Adhesiveness 1 (Preparation of sample for evaluating adhesiveness 1) A hard-to-adhesive coating plate in which an acrylic / silane-based paint was applied to a steel plate was prepared. Each composition prepared as described above was directly applied to the above-mentioned hardly adhesive coating plate without using a primer, cured for 7 days under conditions of 5 ° C. and 50% relative humidity, the composition was cured, and a sample was prepared. Produced. The thickness of the composition after curing was 5 mm. Let the sample produced as mentioned above be a sample for evaluating adhesiveness 1.
- Adhesion 2 (Preparation of sample for evaluating adhesiveness 2) A hard-to-adhesive coating plate in which an acrylic / silane-based paint was applied to a steel plate was prepared. Moreover, each composition manufactured as mentioned above was stored for 14 days under the conditions of 50 ° C. and 95% relative humidity to prepare a composition after storage. Without applying a primer to the hard-to-adhere coating plate, the composition after storage prepared directly as described above was applied, cured for 7 days under conditions of 5 ° C. and 50% relative humidity, and the composition was cured, A sample was made. The thickness of the composition after curing was 5 mm. Let the sample produced as mentioned above be a sample for evaluating adhesiveness 2.
- a peel test similar to the peel test in Adhesive 1 was performed except that a sample for evaluating Adhesive 2 was used.
- the evaluation criteria are the same as those for the adhesiveness 1.
- Adhesive base material what will be described later
- Aliphatic isocyanate A1 Bimuret of hexamethylene diisocyanate (HDI) represented by the above formula (7) (D165N, manufactured by Mitsui Chemicals)
- Aliphatic isocyanate A2 HDI isocyanurate represented by the above formula (8), Takenate D170N manufactured by Mitsui Chemicals, Inc.
- Aromatic isocyanate isocyanurate of tolylene diisocyanate (TDI), Desmodur 1351, manufactured by Bayer
- Bismuth catalyst Inorganic bismuth (Neostan U-600, Nitto Kasei) Dioctyltin catalyst: Dioctyltin dilaurate (Neostan U-810, manufactured by Nitto Kasei) ⁇ Dibutyltin catalyst: Dibutyltin dilaurate (Neostan U-100, manufactured by Nitto Kasei)
- Dimethyltin catalyst 1 Dimethyltin dilaurate (trade name UL-22, manufactured by Momentive)
- Dimethyltin catalyst 2 Dimethyltin didodecyl mercaptide (trade name UL-28, manufactured by Momentive)
- Dimethyltin catalyst 3 dimethyltin bis (2-ethylhexylthioglycolate) (trade name UL-54, manufactured by Momentive)
- Amine catalyst 1 Triethylenediamine (DABCO, manufactured by Air Products)
- Amine catalyst 2 dimorpholino diethyl ether (manufactured by San Apro)
- Comparative Examples 1 to 3 containing a reaction product of an aliphatic isocyanate and an aminosilane compound and containing a metal catalyst other than the dimethyltin catalyst showed low adhesion to the hardly-adhesive coated plate.
- the comparative example 5 which does not contain an aminosilane compound but contains mercaptosilane instead has low adhesiveness with a difficult-to-adhere coating plate.
- Comparative Examples 6 to 8 containing a metal catalyst other than the dimethyltin catalyst the adhesiveness to the hardly adhesive coating plate was low.
- the adhesive composition of the present invention has a desired effect. Comparing Examples 7 and 14 with respect to the structure of the aliphatic isocyanate, dripping resistance and viscosity stability are higher in Example 7 containing the biuret of HDI than in Example 14 containing the isocyanurate of HDI. It was confirmed that the heat-resistant adhesiveness and the piping stability were excellent.
- Example 10 and 12 are compared about content of a dimethyltin catalyst, it is more excellent in heat resistant adhesiveness and piping stability that content of a dimethyltin catalyst is less than 0.5 mass part with respect to 100 mass parts of urethane prepolymers. It was confirmed.
- Examples 1 to 3 were compared with respect to the dimethyltin catalyst content, it was confirmed that the lower the dimethyltin catalyst content, the lower the viscosity increase rate.
- the comparison of Examples 4, 6, and 8, the comparison of Examples 5, 7, and 9, and the comparison of Examples 10 and 12 showed similar results.
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Abstract
Description
このようなウレタン樹脂組成物として、近年、現地施工における組成物の混合調整が不要で取扱いが容易である等の点から、空気中の湿気等によって硬化する1液湿気硬化型ポリウレタン組成物の利用が拡大している。
そこで、本発明は、難接着塗板との接着性に優れた接着剤組成物を提供することを課題とする。
すなわち、本発明者は、以下の構成により上記課題が解決できることを見出した。
下記式(1)で表されるジメチルスズ触媒とを含有する、1液湿気硬化型の接着剤組成物。
2. 2価のヘテロ原子が、酸素原子及び硫黄原子からなる群から選ばれる少なくとも1種である、上記1に記載の接着剤組成物。
3. X1及びX2が硫黄原子であり、
R1及びR2が、無置換の又はエステル結合を有するアルキル基である、上記1又は2に記載の接着剤組成物。
4. X1及びX2が酸素原子であり、
R1及びR2が、カルボニル基を有するアルキル基である、上記1又は2に記載の接着剤組成物。
5. ジメチルスズ触媒の含有量が、ウレタンプレポリマー100質量部に対して、0.001~0.3質量部である、上記1~4のいずれかに記載の接着剤組成物。
6. 脂肪族イソシアネートAが、ヘキサメチレンジイソシアネートと3官能以上のポリオールとの反応物、ヘキサメチレンジイソシアネートのアロファネート体、ヘキサメチレンジイソシアネートのイソシアヌレート体及びヘキサメチレンジイソシアネートのビウレット体からなる群から選ばれる少なくとも1種のヘキサメチレンジイソシアネート変性体である、上記1~5のいずれかに記載の接着剤組成物。
7. アミノシラン化合物Bがイミノ基を有し、イミノ基が少なくとも1個の芳香族炭化水素基に結合する、上記1~6のいずれかに記載の接着剤組成物。
8. 更に、第3級アミンを含有する、上記1~7にいずれかに記載の接着剤組成物。
9. 予備組成物が、更にフィラーを含有する、上記1~8のいずれかに記載の接着剤組成物。
10. 予備組成物が、更に可塑剤を含有する、上記1~9のいずれかに記載の接着剤組成物。
予備組成物と上記式(1)で表されるジメチルスズ触媒とを混合して、上記1~7(又は10)のいずれかに記載の接着剤組成物を製造する混合工程2とを有する、接着剤組成物の製造方法。
12. 混合工程1において、更に、フィラー及び可塑剤からなる群から選ばれる少なくとも1種を使用する、上記11に記載の接着剤組成物の製造方法。
13. 混合工程2において、更に、第3級アミンを使用する、上記11又は12に記載の接着剤組成物の製造方法。
本発明の製造方法によれば、難接着塗板との接着性に優れる接着剤組成物を製造することができる。
なお、本明細書において、「~」を用いて表される数値範囲は、「~」の前後に記載される数値を下限値および上限値として含む範囲を意味する。
また、本明細書において、成分が2種以上の物質を含む場合、上記成分の含有量とは、2種以上の物質の合計の含有量を指す。
本明細書において、難接着性塗板との接着性により優れることを、本発明の効果により優れる、又は、接着性により優れるという。
ウレタンプレポリマーと脂肪族イソシアネートAとアミノシラン化合物Bとを混合して得られる予備組成物と、
下記式(1)で表されるジメチルスズ触媒とを含有する、1液湿気硬化型の接着剤組成物である。
所定のジメチルスズ触媒はジオクチルスズ触媒よりも活性が高く、所定のジメチルスズ触媒を含有することによって本発明の接着剤組成物は、水との反応による接着剤自体の硬化よりも、水以外の活性水素(例えば、塗板)との結合を生成しやすいと本発明者は推測する。これによって本発明の接着剤組成物は難接着塗板に対する接着性に優れると考えられる。
以下、本発明の接着剤組成物に含有される各成分について詳述する。
<ウレタンプレポリマー>
本発明の接着剤組成物に使用されるウレタンプレポリマーは、末端にイソシアネート基を有するウレタンプレポリマーであれば特に制限されない。例えば、ポリイソシアネートと1分子中に2個以上の活性水素含有基を有する化合物(活性水素化合物)とを、活性水素化合物が有する活性水素含有基に対してポリイソシアネートが有するイソシアネート基が過剰になるように反応させたものが使用できる。ウレタンプレポリマーは、0.5~5質量%のイソシアネート基を分子末端に含有することができる。
ポリイソシアネートとしては、例えば、トリレンジイソシアネート(TDI)、ジフェニルメタンジイソシアネート(MDI;例えば、4,4′-ジフェニルメタンジイソシアネート、2,4′-ジフェニルメタンジイソシアネート)、1,4-フェニレンジイソシアネート、ポリメチレンポリフェニレンポリイソシアネート、キシリレンジイソシアネート(XDI)、テトラメチルキシリレンジイソシアネート(TMXDI)、トリジンジイソシアネート(TODI)、1,5-ナフタレンジイソシアネート(NDI)、トリフェニルメタントリイソシアネートのような芳香族ポリイソシアネート;
ヘキサメチレンジイソシアネート(HDI)、トリメチルヘキサメチレンジイソシアネート(TMHDI)、リジンジイソシアネート、ノルボルナンジイソシアネート(NBDI)、トランスシクロヘキサン-1,4-ジイソシアネート、イソホロンジイソシアネート(IPDI)、ビス(イソシアネートメチル)シクロヘキサン(H6XDI)、ジシクロヘキシルメタンジイソシアネート(H12MDI)のような、脂肪族及び/又は脂環式のポリイソシアネート;
これらのカルボジイミド変性ポリイソシアネート;これらのイソシアヌレート変性ポリイソシアネートが挙げられる。
これらのうち、硬化性に優れる、硬化物の物性が良好理由から、芳香族ポリイソシアネートが好ましく、MDIがより好ましい。
活性水素化合物としては、例えば、1分子中に2個以上の水酸(OH)基を有するポリオール化合物等が好適に挙げられ、中でも、ポリオール化合物であるのが好ましい。
ポリエーテルポリオールの重量平均分子量は、イソシアネートとの反応によって得られるウレタンプレポリマーの粘度が常温において適度な流動性を有するという観点から、500~20,000であるのが好ましい。本発明において上記重量平均分子量は、GPC(ゲル浸透クロマトグラフィー:Gel Permeation Chromatographyの略称)法(溶媒:テトラヒドロフラン(THF)を使用)により得られたポリスチレン換算値である。
活性水素化合物はそれぞれ単独でまたは2種以上を組み合わせて使用することができる。
ウレタンプレポリマーはそれぞれ単独でまたは2種以上を組み合わせて使用することができる。
ウレタンプレポリマーはそれぞれ単独でまたは2種以上を組み合わせて使用することができる。
本発明の接着剤組成物に使用される脂肪族イソシアネートAは、1分子中に少なくとも1個のイソシアネート基を有する脂肪族炭化水素化合物であれば特に制限されない。
脂肪族イソシアネートAが有する脂肪族炭化水素基は、特に制限されない。直鎖状、分岐状、環状のいずれであってもよく、直鎖状であるのが好ましい。脂肪族炭化水素基は、飽和、不飽和のいずれであってもよく、飽和であるのが好ましい。
脂肪族イソシアネートAが1分子中に有するイソシアネート基は、接着性により優れるという観点から、2個以上であるのが好ましく、2~3個であるのがより好ましい。
脂肪族イソシアネートAは、接着性により優れ、特に硬化時の環境の違いによる接着性の幅が大きい(つまり、硬化時の環境(例えば温度環境)の違いに関わらず接着性に優れる)という観点から、脂肪族ポリイソシアネートの変性体が好ましい。
本発明の接着剤組成物に使用されるアミノシラン化合物Bは、アミノ基(-NH2)及びイミノ基(-NH-)からなる群から選ばれる少なくとも1種と加水分解性シリル基とを有する化合物であれば特に制限されない。上記アミノ基又はイミノ基と加水分解性シリル基とは有機基を介して結合することができる。
アミノシラン化合物Bがイミノ基を有する場合、イミノ基に結合する基は芳香族炭化水素基であるのが好ましい態様の1つとして挙げられる。
芳香族炭化水素基は、芳香環を少なくとも有する炭化水素基であれば特に制限されない。芳香環としては、例えば、ベンゼン環、ナフタレン環が挙げられる。
芳香環は、置換基を有してもよい。置換基としては例えば、アルキル基が挙げられる。
加水分解性シリル基としては例えば、アルコキシシリル基が挙げられる。具体的には例えば、メトキシシリル基(モノメトキシシリル基、ジメトキシシリル基、トリメトキシシリル基)、エトキシシリル基(モノエトキシシリル基、ジエトキシシリル基、トリエトキシシリル基)が挙げられる。
R1 n-NH2-n-R2-Si-R3 3 (I)
式(I)中、R1は芳香族炭化水素基を表し、nは0又は1であり、R2は2価の脂肪族炭化水素基を表し、3つのR3のうち少なくとも1個はアルコキシ基であり、3つのR3は同一でも異なってもよい。3つのR3のうち1又は2個がアルコキシ基である場合残りのR3はアルキル基であることが好ましい。
2価の脂肪族炭化水素基としては例えば、メチレン基、エチレン基、プロピレン基、トリメチレン基が挙げられる。
アルコキシ基としては例えば、メトキシ基、エトキシ基が挙げられる。
アルキル基としては例えば、メチル基、エチル基が挙げられる。
本発明において、予備組成物は更にフィラーを含有することができる。このような場合、接着剤のチクソ性、接着剤塗布後の深部硬化性、硬化後の物性に優れる。
フィラーは特に制限されない。フィラーは、カーボンブラック及び白色充填材からなる群から選ばれる少なくとも1種であるのが好ましい態様の1つとして挙げられる。フィラーは、例えば、脂肪酸、樹脂酸、ウレタン化合物、脂肪酸エステルのような表面処理剤によって表面処理されたものであってもよい。
カーボンブラックの量は、耐垂下性、硬化物の物性に優れるという観点から、ウレタンプレポリマー100質量部に対して、10~150質量部であるのが好ましく、30~100質量部であるのがより好ましい。
本発明において、予備組成物は更に可塑剤を含有することができる。このような場合、接着剤組成物の粘度及び物性コントロール、塗布性に優れる。
可塑剤としては、例えば、ジイソノニルフタレート(DINP);アジピン酸ジオクチル、コハク酸イソデシル;ジエチレングリコールジベンゾエート、ペンタエリスリトールエステル;オレイン酸ブチル、アセチルリシノール酸メチル;リン酸トリクレジル、リン酸トリオクチル;アジピン酸プロピレングリコールポリエステル、アジピン酸ブチレングリコールポリエステル等が挙げられる。
可塑剤はそれぞれ単独でまたは2種以上を組み合わせて使用することができる。
予備組成物中において、ウレタンプレポリマーとアミノシラン化合物Bとが反応してもよい。また、脂肪族イソシアネートAとアミノシラン化合物Bとが反応してもよい。
よって、予備組成物は、混合後に、更に、アミノシラン化合物Bが脂肪族イソシアネートAと反応した反応物、及び/又は、アミノシラン化合物Bがウレタンプレポリマーと反応した反応物を含むことができる。
本発明の接着剤組成物に含有されるジメチルスズ触媒は、下記式(1)で表される化合物である。
炭化水素基としては、例えば、脂肪族炭化水素基(直鎖状、分岐状、環状のいずれであってもよい。不飽和結合を有してもよい。)、芳香族炭化水素基、又はこれらの組み合わせが挙げられる。
炭化水素基が有する炭素原子又は水素原子の少なくとも1個が、置換基と置き換わってもよい。置換基としては、例えば、カルボニル基、エステル結合が挙げられる。炭化水素基が有する炭素原子のうち、上記炭化水素基の両末端以外に位置する炭素原子が置換基と置き換わってもよい。
ジメチルスズ触媒は、触媒活性に優れ、貯蔵後の組成物の粘度の上昇を抑制できるという観点から、式(1)において、X1及びX2が酸素原子であり、R1及びR2が、カルボニル基を有するアルキル基であり、上記酸素原子が上記カルボニル基と結合してエステル結合を形成するジメチルスズジカルボキシレートが好ましい。
具体的なジメチルスズジカルボキシレートとしては、例えば、下記式(2-1)で表されるジメチルスズジラウレート;下記式(2-2)で表されるジメチルスズジオクテートが挙げられる。
ジメチルスズ触媒は、接着性により優れ、(触媒自体の)安定性と触媒活性のバランス、配管安定性に優れ、貯蔵後の組成物の粘度の上昇を抑制できるという観点から、式(1)において、X1及びX2が硫黄原子であり、R1及びR2が、無置換の又はエステル結合を有するアルキル基であるチオ系ジメチルスズ触媒であるのが好ましい。この場合、R1及びR2は同じでも異なってもよい。
なお、R1及びR2が、無置換の又はエステル結合を有するアルキル基であることは、R1及びR2が無置換のアルキル基であること、又は、R1及びR2がエステル結合を有するアルキル基であることを意味する。
また、エステル結合を有するアルキル基において、上記アルキル基が有する炭素原子の少なくとも1個が、置換基と置き換わってもよい。置換基としては、例えば、カルボニル基、エステル結合が挙げられる。アルキル基が有する炭素原子のうち、上記アルキル基の両末端以外に位置する炭素原子が置換基と置き換わってもよい。
式(1)において、X1及びX2が硫黄原子であり、R1及びR2が無置換のアルキル基であるチオ系ジメチルスズ触媒としては、例えば、ジメチルスズジメルカプチドが挙げられる。
式(1)において、X1及びX2が硫黄原子であり、R1及びR2がエステル結合を有するアルキル基であるジメチルスズ触媒としては、例えば、ジメチルスズジチオグリコレートが挙げられる。
本発明の接着剤組成物は、更に、第3級アミンを含有することができる。
第3級アミンとしては、例えば、トリメチルアミン、トリエチルアミン、トリプロピルアミン、トリブチルアミン、トリアミルアミン、トリヘキシルアミン、トリオクチルアミン、トリラウリルアミン、ジメチルエチルアミン、ジメチルプロピルアミン、ジメチルブチルアミン、ジメチルアミルアミン、ジメチルヘキシルアミン、ジメチルシクロヘキシルアミン、ジメチルオクチルアミン、ジメチルラウリルアミン、トリアリルアミン、テトラメチルエチレンジアミン、テトラメチルブタンジアミン、トリエタノールアミンのような鎖状アミン;
トリエチレンジアミン、N-メチルモルフォリン、4,4′-(オキシジ-2,1-エタンジイル)ビス-モルフォリン、N,N-ジメチルアミノエチルモルフォリン、ピリジン、ピコリン、1,8-ジアザビシクロ〔5.4.0〕ウンデセン、1、1,4-ジアザビシクロ〔2.2.2〕オクタン、N,N′-ジメチルピペラジン、ジモルフォリノジエチルエーテル、ビス(2,2-モルフォリノエチル)エーテルのような、第3級アミンを構成する窒素原子が環構造の一部を形成するアミン;
ビス(ジメチルアミノエチル)エーテルのようなエーテル結合を有するアミン;
N,N-ジメチルベンジルアミン、ジメチルアミノメチルフェノール、トリスジメチルアミノメチルフェノールのような環構造と第3級アミンとを有する化合物等が挙げられる。
第3級アミンはそれぞれ単独でまたは2種以上を組み合わせて使用することができる。
これらのうち、塗布時の塗膜形成性が良好となり、また、貯蔵安定性と硬化速度とのバランスが良好となる理由から、N,N-ジメチルアミノエチルモルフォリン、ジモルフォリノジエチルエーテルであるのが好ましい。
本発明の接着剤組成物は、必要に応じて本発明の目的を損なわない範囲で、例えば、脂肪族イソシアネートA以外のイソシアネート化合物、アミノシラン化合物B以外のシランカップリング剤、ジメチルスズ触媒及び第3級アミン以外の触媒、接着付着剤、垂れ止め剤、老化防止剤、酸化防止剤、顔料(染料)、揺変性付与剤、紫外線吸収剤、難燃剤、界面活性剤(レベリング剤を含む)、分散剤、脱水剤、帯電防止剤などの添加剤を更に含有することができる。添加剤の量は適宜決めることができる。
本発明の接着剤組成物は、湿気硬化することができる。例えば、大気中の湿気によって-20~+50℃の条件下で硬化することができる。
本発明の接着剤組成物は、環境温度が-20℃~+5℃のような低温であっても、難接着塗板に対する接着性に優れる。
被着体に対してプライマーを使用せずに本発明の接着剤組成物を被着体に適用することができる。
本発明の接着剤組成物は難接着塗板に使用することができる。難接着塗板に塗布されている塗料は特に制限されない。例えば、アクリル/シラン系塗料が挙げられる。なお本明細書において、A/B系塗料は、A系塗料及びB系塗料を意味する。難接着塗板に塗布されている塗料が例えばアクリル/シラン系塗料である場合、難接着塗板に塗布されている塗料はアクリル系塗料及びシラン系塗料である。
また本発明の接着剤組成物は難接着塗板以外の塗板に対する接着性に優れる。難接着塗板以外の塗板は特に制限されない。例えば、従来公知のものが挙げられる。難接着塗板以外の塗板に使用される塗装としては例えば、ウレタン塗料、酸/エポキシ系塗料、アクリル/メラミン系塗料が挙げられる。
本発明の接着剤組成物の製造方法について以下に説明する。
本発明の接着剤組成物の製造方法(本発明の製造方法)は、
ウレタンプレポリマーと脂肪族イソシアネートAとアミノシラン化合物Bとを混合して予備組成物を得る混合工程1と、
予備組成物と上記式(1)で表されるジメチルスズ触媒とを混合して、本発明の接着剤組成物を製造する混合工程2とを有する、接着剤組成物の製造方法である。
混合工程1において使用される、ウレタンプレポリマー、脂肪族イソシアネートA、アミノシラン化合物Bは上記と同様である。
混合工程1において更にフィラー及び可塑剤からなる群から選ばれる少なくとも1種を使用する場合、ウレタンプレポリマーと脂肪族イソシアネートAとアミノシラン化合物Bとを初めに混合し、これにフィラー及び可塑剤からなる群から選ばれる少なくとも1種を添加して予備組成物を製造してもよい。
また、ウレタンプレポリマーと、脂肪族イソシアネートAと、アミノシラン化合物Bと、フィラー及び可塑剤からなる群から選ばれる少なくとも1種とを同時に混合して予備組成物を製造してもよい。
また、例えば、ウレタンプレポリマー、可塑剤、脂肪族イソシアネートAを混合し、これにアミノシランBを添加して混合し、次いでフィラーを添加して混合することによって、予備組成物を製造してもよい。
混合工程1における混合温度は40~90℃であるのが好ましい。
混合工程1は減圧下で行うのが好ましい。
混合工程2において使用されるジメチルスズ触媒は上記式(1)で表されるジメチルスズ触媒と同様である。
混合工程2における混合温度は40~70℃であるのが好ましい。
混合工程2は減圧下で行うのが好ましい。
本発明の接着剤組成物が更に添加剤を含有する場合、混合工程1及び/又は2において添加剤を適宜添加することができる。
本発明の接着剤組成物が更に第3級アミンを含有する場合、第3級アミンを混合工程2において使用するのが好ましい態様の1つとして挙げられる。
<組成物の製造>
まず、混合工程1において、下記第1表の混合工程1に示す各成分を同表に示す組成(質量部)で用いて、これらを横型ミキサーで40~70℃、2kPa以下の条件下で1時間混合し、予備組成物を製造した。上記のとおり製造された予備組成物をそのまま混合工程2に用いた。
なお、混合工程1において、イソシアネート化合物と、シラン化合物と、第2表に示される、ウレタンプレポリマー以外の各成分とは、第2表に示されるウレタンプレポリマーに同時に添加され混合された。
上記のとおり製造された組成物を用いて以下の評価を行った。結果を第1表に示す。
上記のとおり製造した各組成物を、ガラス板の上に、底辺6mm、高さ10mmの直角三角形ビードで帯状に押し出し、その後、上記直角三角形の形状に押し出された組成物の斜辺が下向きになり、上記組成物の高さ10mmの辺が水平になるようにガラス板を垂直(90°の角度)に立て、ガラス板を固定し、ガラス板を垂直に保持したまま、20℃、65%相対湿度の条件下で30分放置した。
ガラス板を垂直にした後から30分の間に、各組成物の直角三角形の頂点が、下へ垂れ下がった距離h(mm)を測定し、この値で耐垂下性を評価した。上記値を第1表の垂下性の欄に示した。上記値が小さいほど耐垂下性に優れる。
(初期粘度)
上記のとおり製造した組成物のSOD粘度(初期粘度)を、JASO M338-89に準拠して、圧力粘度計(ASTM D 1092)を用いて測定した。
(貯蔵後の粘度)
また、上記のとおり製造した組成物を容器に入れ、窒素ガスで空気を置換して、容器を密封し、40℃で7日間貯蔵した後の組成物のSOD粘度(Pa・s)を測定した。貯蔵後の粘度の測定方法は上記と同様である。
(粘度上昇率の算出及び評価基準)
初期粘度、貯蔵後の粘度から、粘度上昇率(初期粘度に対する、増加した粘度の比)を算出した。
粘度上昇率が30%以下である場合、粘度安定性(貯蔵安定性)に優れると評価できる。
(耐熱接着性評価用サンプルの作製)
被着材としてガラス(縦25mm×横100mm×厚み8mm、プライマー処理済み、プライマーは商品名MS-90、横浜ゴム社製)を1枚準備した。
上記のとおり製造した各組成物を室温下で上記ガラスに塗布した。
塗布後各ガラス上の組成物を厚さ5mmまで圧着し、23℃、50%相対湿度の条件下で72時間硬化させた後、120℃環境下に7日間放置し、耐熱接着性評価用サンプルとした。
上記のとおり得られた耐熱接着性評価用サンプルを用いてカッターナイフによる手剥離試験を実施した。
手剥離試験の結果、硬化後の組成物が凝集破壊した場合を「CF」と表示した。この場合耐熱接着性に非常に優れる。
また硬化後の組成物がプライマーとの界面で界面剥離した場合、これを「PS」と表示した。この場合、耐熱接着性が低い。
上記のとおり製造された組成物を、ホース(直径5mm、長さ20cm、商品名チューコーフローチューブ、中興化成社製、ポリテトラフルオロエチレン(PTFE)製)に空気が入らないように充填し、充填後ホースを密閉し、密閉されたホースを50℃の条件下に1週間置いた。
1週間後、ホースを室温に戻し、ホースの中央を輪切りにし、未硬化の組成物をホースから除いて、ホース内を観察した。
ホース内に組成物が残らなかった場合を配管安定性に優れると評価して、これを「〇」と表示した。
組成物がホースの内面から中心に向かって硬化した場合、ホースの切断面において、ホースの内面上の任意の点から、ホースの切断面の中心への方向に向かって、硬化した組成物の厚みを測定した。厚みが大きいほど配管安定性が低い。
(接着性1を評価するためのサンプルの作製)
鋼板にアクリル/シラン系塗料が塗布された難接着塗板を準備した。
上記難接着塗板に、プライマーを用いず、直接上記のとおり製造した各組成物を塗布し、5℃、50%相対湿度の条件下で7日間養生して、組成物を硬化させて、サンプルを作製した。硬化後の組成物の厚さは5mmであった。上記のとおり作製されたサンプルを、接着性1を評価するためのサンプルとする。
上記のとおり作製されたサンプルが有する硬化後の組成物の一端を把持して、20℃の条件下で、硬化後の組成物を難接着塗板から180度剥離する剥離試験を行い、破壊状態を観察した。
硬化物が凝集破壊した場合を接着性に優れると評価し、これを「CF」と表示した。
硬化物が界面剥離した場合を接着性が低いと評価し、これを「AF」と表示した。
(接着性2を評価するためのサンプルの作製)
鋼板にアクリル/シラン系塗料が塗布された難接着塗板を準備した。
また、上記のとおり製造した各組成物を、50℃、95%相対湿度の条件下で14日間貯蔵して、貯蔵後の組成物を準備した。
上記難接着塗板に、プライマーを用いず、直接上記のとおり準備した貯蔵後の組成物を塗布し、5℃、50%相対湿度の条件下で7日間養生して、組成物を硬化させて、サンプルを作製した。硬化後の組成物の厚さは5mmであった。上記のとおり作製されたサンプルを、接着性2を評価するためのサンプルとする。
・接着剤ベース材:後述するもの
・脂肪族イソシアネートA1:上記式(7)で表される、ヘキサメチレンジイソシアネート(HDI)のビウレット体(D165N、三井化学社製)
・脂肪族イソシアネートA2:上記式(8)で表される、HDIのイソシアヌレート体、三井化学社製タケネートD170N
・芳香族イソシアネート:トリレンジイソシアネート(TDI)のイソシアヌレート体、デスモジュール1351、バイエル社製
・アミノシラン化合物B1:N-フェニル-3-アミノプロピルトリエトキシシラン、KBM-573、信越化学工業社製
・脂肪族イソシアネートA2とアミノシラン化合物B1との反応物:上記の脂肪族イソシアネートA2:6質量部とアミノシラン化合物B1:2質量部とを混合し、得られた混合物を50℃の条件下で10時間反応させて製造した化合物。得られた化合物をそのまま脂肪族イソシアネートA2とアミノシラン化合物B1との反応物として使用した。
・ジオクチルスズ触媒:ジオクチル錫ジラウレート(ネオスタンU-810、日東化成社製)
・ジブチルスズ触媒:ジブチル錫ジラウレート(ネオスタンU-100、日東化成社製)
・ジメチルスズ触媒2:ジメチルスズジドデカシルメルカプチド(商品名UL-28、モメンティブ社製)
・ジメチルスズ触媒3:ジメチルスズビス(2-エチルヘキシルチオグリコレート)(商品名UL-54、モメンティブ社製)
・アミン触媒2:ジモルフォリノジエチルエーテル(サンアプロ社製)
・ウレタンプレポリマー1:ポリオキシプロピレンジオール(重量平均分子量2000)500g、ポリオキシプロピレントリオール(重量平均分子量5000)1150g、および4,4′-ジイソシアネートフェニルメタン(分子量250)264gを混合し(この時NCO/OH=1.8)、窒素気流中、80℃で24時間撹拌を行い、反応させて、イソシアネート基を1.45%含有するウレタンプレポリマー1を合成した。
・カーボンブラック:N220、新日化カーボン社製
・炭酸カルシウム:重質炭酸カルシウム(スーパーS、丸尾カルシウム社製)
・可塑剤:フタル酸ジイソノニル(DINP、ジェイプラス社製)
脂肪族イソシアネートを含有せず代わりに芳香族イソシアネートを含有する比較例4は、難接着塗板との接着性が低かった。
アミノシラン化合物を含有せず代わりにメルカプトシランを含有する比較例5は、難接着塗板との接着性が低かった。
ジメチルスズ触媒以外の金属触媒を含有する比較例6~8は、難接着塗板との接着性が低かった。
脂肪族イソシアネートの構造について実施例7と14とを比較すると、HDIのビウレット体を含有する実施例7のほうが、HDIのイソシアヌレート体を含有する実施例14よりも、耐垂下性、粘度安定性、耐熱接着性、配管安定性に優れることが確認された。
また、ジメチルスズ触媒の構造について実施例11~13の配管安定性を比較すると、ジメチルスズジカルボキシレート、ジメチルスズジチオメルカプチド、ジメチルスズジチオグリコレートの順で配管安定性に優れ、ジメチルスズジチオグリコレートが最も配管安定性に優れた。
ジメチルスズ触媒の含有量について実施例1~3を比較すると、ジメチルスズ触媒の含有量が少ないほうが粘度上昇率が低いことが確認された。実施例4、6、8の比較、実施例5、7、9の比較、及び、実施例10、12の比較も同様の結果を示した。
Claims (13)
- 前記2価のヘテロ原子が、酸素原子及び硫黄原子からなる群から選ばれる少なくとも1種である、請求項1に記載の接着剤組成物。
- 前記X1及び前記X2が硫黄原子であり、
前記R1及び前記R2が、無置換の又はエステル結合を有するアルキル基である、請求項1又は2に記載の接着剤組成物。 - 前記X1及び前記X2が酸素原子であり、
前記R1及び前記R2が、カルボニル基を有するアルキル基である、請求項1又は2に記載の接着剤組成物。 - 前記ジメチルスズ触媒の含有量が、前記ウレタンプレポリマー100質量部に対して、0.001~0.3質量部である、請求項1~4のいずれか1項に記載の接着剤組成物。
- 前記脂肪族イソシアネートAが、ヘキサメチレンジイソシアネートと3官能以上のポリオールとの反応物、ヘキサメチレンジイソシアネートのアロファネート体、ヘキサメチレンジイソシアネートのイソシアヌレート体及びヘキサメチレンジイソシアネートのビウレット体からなる群から選ばれる少なくとも1種のヘキサメチレンジイソシアネート変性体である、請求項1~5のいずれか1項に記載の接着剤組成物。
- 前記アミノシラン化合物Bがイミノ基を有し、前記イミノ基が少なくとも1個の芳香族炭化水素基に結合する、請求項1~6のいずれか1項に記載の接着剤組成物。
- 更に、第3級アミンを含有する、請求項1~7にいずれか1項に記載の接着剤組成物。
- 前記予備組成物が、更にフィラーを含有する、請求項1~8のいずれか1項に記載の接着剤組成物。
- 前記予備組成物が、更に可塑剤を含有する、請求項1~9のいずれか1項に記載の接着剤組成物。
- 前記ウレタンプレポリマーと前記脂肪族イソシアネートAと前記アミノシラン化合物Bとを混合して予備組成物を得る混合工程1と、
前記予備組成物と前記ジメチルスズ触媒とを混合して、請求項1~7のいずれか1項に記載の接着剤組成物を製造する混合工程2とを有する、接着剤組成物の製造方法。 - 前記混合工程1において、更に、フィラー及び可塑剤からなる群から選ばれる少なくとも1種を使用する、請求項11に記載の接着剤組成物の製造方法。
- 前記混合工程2において、更に、第3級アミンを使用する、請求項11又は12に記載の接着剤組成物の製造方法。
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CA2992696A CA2992696A1 (en) | 2015-07-17 | 2016-07-15 | Adhesive composition and production method therefor |
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WO2019151641A1 (ko) * | 2018-01-30 | 2019-08-08 | 주식회사 케이씨씨 | 폴리우레탄 수지 조성물 |
EP3539997A1 (de) * | 2018-03-14 | 2019-09-18 | tesa SE | Thermisch vulkanisierbares, während der aufheiz- und härtungsphase scherfestes klebeband |
JPWO2020157854A1 (ja) * | 2019-01-30 | 2021-12-02 | 横浜ゴム株式会社 | ウレタン系接着剤組成物 |
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