WO2020202561A1 - 接着剤セット及び構造体の製造方法 - Google Patents
接着剤セット及び構造体の製造方法 Download PDFInfo
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- WO2020202561A1 WO2020202561A1 PCT/JP2019/015172 JP2019015172W WO2020202561A1 WO 2020202561 A1 WO2020202561 A1 WO 2020202561A1 JP 2019015172 W JP2019015172 W JP 2019015172W WO 2020202561 A1 WO2020202561 A1 WO 2020202561A1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
- C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
- C08G18/792—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
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- C—CHEMISTRY; METALLURGY
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- 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
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- 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
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- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
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- C09J2203/354—Applications of adhesives in processes or use of adhesives in the form of films or foils for automotive applications
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- C09J2475/00—Presence of polyurethane
Definitions
- the present invention relates to an adhesive set and a method for manufacturing a structure.
- Steel plates are generally used for interior and exterior parts of automobile bodies, front doors, rear doors, back doors, front bumpers, rear bumpers, rocker moldings, etc., but weight reduction is required to meet recent demands for improved fuel efficiency. Has been done. For this reason, plastic materials such as polypropylene are increasingly used as interior / exterior parts of automobiles instead of steel plates. Since plastic materials such as polypropylene have lower strength than steel sheets, it is common to add talc, glass filler, or the like to improve the strength.
- Urethane-based compositions have been proposed as an adhesive between plastic automobile parts such as polypropylene.
- a one-component composition called a moisture-curing type, which is cured by moisture in the air
- an adhesive set composed of a main agent and a curing agent are used to prepare a main agent and a curing agent.
- two-component compositions that mix Among these, from the viewpoint of workability in the bonding process, a sufficient pot life (time until the paint starts to cure due to a chemical reaction in a pot life or a multi-component paint) can be sufficiently secured, and quick curing becomes possible. Two-component compositions tend to be preferred.
- polypropylene base material has a small surface polarity and is difficult to adhere. Therefore, in order to facilitate adhesion, a surface treatment for introducing a polar group is performed on the surface of the base material. Examples of the surface treatment include plasma treatment, corona treatment, frame treatment and the like. Furthermore, since it is difficult to directly apply the urethane-based composition to the adhesion between the surface-treated polypropylene base materials, the urethane-based composition is applied after the primer treatment is performed on each polypropylene base material as a pretreatment. It is common to do. However, in recent years, from the viewpoint of simplifying the process, improving the working environment, etc., improvement of adhesiveness (that is, non-primer adhesiveness) when primer treatment is not performed has been required.
- Patent Document 1 discloses a two-component curable composition in which a main agent containing an isocyanate compound (first liquid) and a curing agent containing ketimine (second liquid) are mixed during work. ..
- Patent Document 1 does not mention a primer, as a result of examination by the present inventors, in the two-component curable composition of Patent Document 1, a polypropylene base material is adhered without a primer treatment. Turned out to be difficult. Further, it was found that the two-component curable composition of Patent Document 1 is not sufficient in terms of heat aging resistance.
- an adhesive set has excellent non-primer adhesiveness and also excellent heat aging resistance. We have found that it is possible to prepare, and have completed the present invention.
- One aspect of the present invention is an adhesive set composed of a main agent and a curing agent, wherein the main agent is a urethane prepolymer having an isocyanate group as a terminal group and a silane coupling agent having a mercapto group or an amino group.
- the main agent is a urethane prepolymer having an isocyanate group as a terminal group and a silane coupling agent having a mercapto group or an amino group.
- an adhesive set containing a modified isocyanate group and a multimer of hexamethylene diisocyanate having at least two unmodified isocyanate groups, wherein the curing agent contains a polyol.
- the multimer may be a trimer of an isocyanate group modified with a silane coupling agent having a mercapto group or an amino group and a hexamethylene diisocyanate having two unmodified isocyanate groups.
- At least one of the main agent and the curing agent may further contain a curing catalyst.
- the present invention attaches a first substrate and a second substrate to a structure via a mixture obtained by mixing a main agent and a curing agent in the above-mentioned adhesive set.
- a method for manufacturing a structure which comprises a step of obtaining.
- an adhesive set capable of preparing an adhesive having excellent non-primer adhesiveness and also excellent heat aging resistance. Further, according to the present invention, there is provided a method for manufacturing a structure using an adhesive set.
- the numerical range shown by using “-" indicates the range which includes the numerical values before and after "-" as the minimum value and the maximum value, respectively.
- the upper limit value or the lower limit value of the numerical range of one step may be replaced with the upper limit value or the lower limit value of the numerical range of another step.
- the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
- the adhesive set according to one embodiment is composed of a main agent and a curing agent.
- a mixture two-component curing type urethane-based composition
- the mixture cures over time and can act as an adhesive that adheres the substrates.
- the main agent is (a) a urethane prepolymer having an isocyanate group as a terminal group, (b) an isocyanate group modified with a silane coupling agent having a mercapto group or an amino group, and at least two unmodified isocyanates. It contains a multimer of hexamethylene diisocyanate having a group (hereinafter, may be referred to as "modified hexamethylene diisocyanate multimer").
- the curing agent contains (c) polyol. At least one of (A) main agent and (B) curing agent may contain any one of (d) curing catalyst, (e) carbon black, (f) filler, and (g) plasticizer.
- each component will be described.
- the component (a) is a reaction product of a compound having two or more active hydrogen groups and a polyisocyanate compound having two or more isocyanate groups. By reacting the component (a) so that the number of isocyanate groups becomes excessive, a component having an isocyanate group as a terminal group can be obtained.
- the active hydrogen group include a hydroxy group (OH group), a carboxyl group (COOH group), an amino group (NH 2 group), a mercapto group (SH group) and the like.
- the compound having two or more active hydrogen groups may be a polyol which is a compound having two or more hydroxy groups (OH groups), or may be a (a-1) polyether polyol.
- polyisocyanate compound examples include aromatic polyisocyanates in which an isocyanate group is bonded to an aromatic hydrocarbon, and alicyclic polyisocyanates in which an isocyanate group is bonded to an alicyclic hydrocarbon.
- the polyisocyanate compound may be (a-2) aromatic polyisocyanate or diphenylmethane diisocyanate.
- the compound having two or more active hydrogen groups and the polyisocyanate compound having two or more isocyanate groups one kind may be used alone or two or more kinds may be used in combination.
- the component (a-1) is not particularly limited as long as it is a polyether polyol having two or more OH groups. Specific examples thereof include polyethylene glycol (PEG), polypropylene glycol (PPG), ethylene oxide / propylene oxide copolymer, polytetramethylene ether glycol (PTMEG), and sorbitol-based polyol. Among these, the component (a-1) may be polypropylene glycol (PPG). Further, as the component (a-1), one type may be used alone, or two or more types may be used in combination.
- the number average molecular weight of the component (a-1) may be 10,000 or less, and may be 9000 or less, 8000 or less, 7000 or less, or 6000 or less. When the number average molecular weight of the component (a-1) is 10,000 or less, the mechanical strength of the adhesive after curing tends to be higher.
- the number average molecular weight of the component (a-1) is not particularly limited, but may be, for example, 500 or more.
- the "number average molecular weight" is calculated by using gel permeation chromatography (GPC) and using a standard polystyrene calibration curve.
- GPC gel permeation chromatography
- the GPC measurement conditions are as follows. Measuring instrument: ACQUITY UPLC APC system (manufactured by Waters) Columns: APC XT-900, APC XT-200, APC XT-125, APC XT-45 (manufactured by Waters) Carrier: tetrahydrofuran (THF) Detector: Differential refractometer Sample: 0.5 mass% THF solution Calibration curve: Polystyrene
- ((A-2) Aromatic polyisocyanate
- Examples of the component (a-2) include 4,4'-diphenylmethane diisocyanate (4,4'-MDI (monomeric MDI)), 2,4'-diphenylmethane diisocyanate) (2,4'-MDI) and the like. Can be mentioned.
- the content of the component (a) may be 20 to 50% by mass, 25 to 45% by mass, or 30 to 40% by mass based on the total amount of the main agent (A).
- the content of the component (a) is 20% by mass or more based on the total amount of the main agent (A)
- the amount is 50% by mass or less based on the total amount of (A) main agent, it tends to be possible to prevent a decrease in the adhesive strength of the adhesive after curing.
- the component (b) is a multimer of an isocyanate group modified with a silane coupling agent having a mercapto group or an amino group and a hexamethylene diisocyanate having at least two unmodified isocyanate groups.
- the components (b) are (b-1) a multimer of hexamethylene diisocyanate having an unmodified isocyanurate group (hereinafter, may be referred to as "unmodified hexamethylene diisocyanate multimer”) and (b-2) mercapto. It is a reaction product with a silane coupling agent having a group or an amino group.
- the reaction product When the reaction product is used as the component (b), the reaction product contains an isocyanate group modified with the component (b-1), the component (b-2), and one unmodified component in addition to the component (b). It may contain a multimer of hexamethylene diisocyanate having an isocyanate group of.
- an unmodified hexamethylene diisocyanate trimer is used as the component (b-1)
- the component (b) is a hexagon having an isocyanate group modified with the component (b-2) and two unmodified isocyanate groups. It may be a trimer of methylene diisocyanate.
- the isocyanate group modified with the component (b-2) in the component (b) contributes to the improvement of the interfacial adhesive force with the polypropylene base material, and at least two unmodified isocyanate groups are contained in the curing agent ( c) Can contribute to the formation of crosslinks with polyols. Therefore, by using a main agent containing such a component (b), the adhesive set can prepare an adhesive having excellent non-primer adhesiveness and further excellent heat aging resistance.
- the component (b-1) is not particularly limited as long as it is a multimer of hexamethylene diisocyanate having an unmodified isocyanate group, and is, for example, an isocyanurate form, a biuret form, an adduct form of trimethylolpropane (TMP), or the like. It may be a trimer.
- TMP trimethylolpropane
- Examples of such trimeric commercial products include Sumijour N3300 (trade name, manufactured by Sumika Bayer Urethane Co., Ltd.), Duranate 24A-100 (trade name, manufactured by Asahi Kasei Corporation), and Duranate E402-100 (product name). Name, manufactured by Asahi Kasei Corporation), etc.
- the component (b-1) one type may be used alone, or two or more types may be used in combination.
- the silane coupling agent having a mercapto group is a silane compound having a mercapto group (SH group) which is an active hydrogen group capable of reacting with the isocyanurate group of the component (b-1) and a hydrolyzable group.
- the silane coupling agent having a mercapto group include 3-mercaptopropylmethyldimethoxysilane and 3-mercaptopropyltrimethoxysilane.
- the silane coupling agent having a mercapto group one type may be used alone, or two or more types may be used in combination. Further, it may be used in combination with a silane coupling agent having an amino group described later.
- Silane coupling agents having an amino group, (b-1) an amino group (NH 2 group or NHR group (R: hydrocarbon group)) is an active hydrogen group capable of reacting with isocyanurate groups of component and hydrolyzable It is a silane compound having a group.
- the silane coupling agent having an amino group include N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, and N-2.
- silane coupling agent having an amino group one type may be used alone, or two or more types may be used in combination. Further, it may be used in combination with the above-mentioned silane coupling agent having a mercapto group.
- the component (b) is an equivalent ratio (NCO group) of the component (b-1) and the component (b-2) to the SH group or NH group of the component (b-2) and the NCO group of the component (b-1). / SH group or NH group) can be adjusted.
- NCO group hexamethylene diisocyanate trimeric
- it usually has three NCO groups, so (NCO group / SH group or NH group) is 2.5 to 3.
- the component (b) having an isocyanate group modified with the component (b-2) and two unmodified isocyanate groups can be obtained.
- the reaction between the component (b-1) and the component (b-2) may be carried out in the presence of a catalyst.
- the catalyst may be, for example, the same as the curing catalyst (d) described later.
- the content of the catalyst can be appropriately set according to the types of the component (b-1) and the component (b-2).
- the temperature and time for reacting the component (b-1) and the component (b-2) may be, for example, 35 to 50 ° C. and 2 to 5 hours.
- the content of the component (b) may be 2 to 10% by mass, 2 to 7% by mass, or 3 to 6% by mass based on the total amount of the (A) main agent.
- the content of the component (b) is 2% by mass or more based on the total amount of the main agent (A)
- the adhesiveness between the surface of the base material and the adhesive is improved, and when peeled off, interface destruction occurs.
- the content of the component (b) is 10% by mass or less based on the total amount of the main agent (A)
- the component (c) is not particularly limited as long as it is a polyol having two or more OH groups, but for example, the polyether polyol exemplified in the above-mentioned component (a-1) can be used.
- the number average molecular weight of the component (c) may be the same as the number average molecular weight of the component (a-1).
- the content of the component (c) may be 35 to 60% by mass or 40 to 55% by mass based on the total amount of the (B) curing agent.
- the content of the component (c) is 35% by mass or more based on the total amount of the curing agent (B), it tends to be possible to prevent a decrease in the elongation rate of the adhesive after curing
- the component (b) When the content of (B) is 60% by mass or less based on the total amount of the curing agent (B), it tends to be possible to prevent a decrease in the adhesive strength after curing.
- a known catalyst that promotes the urethanization reaction or the urea conversion reaction can be used.
- the component (d) include a tin catalyst, an amine catalyst, and the like, which can be appropriately selected according to a desired curing rate.
- the tin catalyst include dibutyltin dilaurate, dioctyltin dilaurate, dibutyltin didecanete, dioctyltin didecanate, tin 2-ethylhexanoate and the like.
- the amine catalyst include triethylenediamine, bis (dimethylaminoethyl) ether, di (N, N-dimethylaminoethyl) amine and the like.
- the total content of the component (d) is 0.1 to 10.0% by mass, 0.1 to 5.0% by mass, or 0.1 to 0.1 to 10.0% by mass based on the total amount of (A) main agent and (B) curing agent. It may be 3.0% by mass.
- the component (e) may have an average particle size (D50: particle size of 50% of the volume particle size distribution curve) of 20 to 40 nm or 25 to 35 nm.
- D50 average particle size of 50% of the volume particle size distribution curve
- the average particle size (D50) of carbon black can be measured by a laser diffracted light scattering method using, for example, "Model LS-230" manufactured by Beckman Coulter.
- the component (e) Commercially available products of the component (e) include, for example, Monarch 460 (manufactured by Cabot Corporation), Asahi Carbon 70 (manufactured by Asahi Carbon Co., Ltd.), Seest 3 (manufactured by Tokai Carbon Co., Ltd.), and Mitsubishi Carbon 32 (manufactured by Mitsubishi Chemical Corporation). (Manufactured by), Niteron 200 (manufactured by Tokai Carbon Co., Ltd.) and the like.
- the total content of the component (e) may be 5 to 40% by mass based on the total amount of the (A) main agent and (B) curing agent.
- the strength of the adhesive tends to improve, and when it is 40% by mass or less. If there is, there is a tendency that the strength of the adhesive can be maintained because the dispersibility is improved.
- the total content of the component (e) may be 10 to 30% by mass because the workability and weather resistance of the adhesive can be further improved.
- the component (f) includes kaolin, talc, silica, titanium oxide, calcium carbonate, bentonite, mica, sericite, glass flakes, glass fibers, graphite, magnesium hydroxide, and hydroxide.
- examples thereof include aluminum, antimony trioxide, barium sulfate, zinc borate, alumina, magnesia, wollastonite, zonotrite, whisker and the like.
- the total content of the component (f) may be 5 to 40% by mass or 10 to 30% by mass based on the total amount of the (A) main agent and (B) curing agent.
- phthalate ester compounds examples include dioctyl phthalate (DOP), dibutyl phthalate (DBP), diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), butylbenzyl phthalate (BBP) and the like. ..
- DOP dioctyl phthalate
- DBP dibutyl phthalate
- DINP diisononyl phthalate
- DIDP diisodecyl phthalate
- BBP butylbenzyl phthalate
- the total content of the component (g) may be 5 to 40% by mass or 10 to 30% by mass based on the total amount of the (A) main agent and (B) curing agent.
- At least one of the main agent (A) and the curing agent (B) has an ultraviolet absorber, a dehydrating agent, a pigment, a dye, an antioxidant, an antioxidant, an antistatic agent, a flame retardant, and an adhesiveness. It may further contain an imparting agent, a dispersant, a solvent and the like.
- the viscosity of the main agent at 20 ° C. may be, for example, 500 to 2000 Pa ⁇ s, 1000 to 2000 Pa ⁇ s, or 1250 to 1750 Pa ⁇ s.
- the viscosity at 20 ° C. is the viscosity at 20 ° C. measured using a B-type rotational viscometer (trade name: VISCOMETER-TV25H, manufactured by Toki Sangyo Co., Ltd., applicable rotor: No. 7). Means.
- the viscosity of the curing agent (B) at 20 ° C. may be, for example, 500 to 2000 Pa ⁇ s, 1000 to 2000 Pa ⁇ s, or 1250 to 1750 Pa ⁇ s.
- the viscosity of the curing agent at 20 ° C. is 500 Pa ⁇ s or more, the bead shape when the adhesive is applied tends to be easily maintained.
- the viscosity of the curing agent at 20 ° C. is 2000 Pa ⁇ s or less, the air pressure required for discharging the adhesive can be suppressed, and the adhesive tends to be easily discharged.
- the equivalent ratio (NCO group / OH group) of (A) the isocyanate group (NCO) in the main agent to the hydroxyl group (OH) in the (B) curing agent is determined, for example. , 1.0 to 5.0 is preferable.
- the equivalent ratio (NCO group / OH group) is 1.0 or more, the abundance ratio of the unreacted polyol decreases when the main agent and the curing agent are mixed, so that sufficient adhesive properties tend to be obtained. is there.
- the isocyanate group in (A) the main agent is mainly derived from (a) urethane prepolymer and (b) modified hexamethylene diisocyanate multimer, and the hydroxyl group in (B) curing agent is mainly in (c) polyol. It is derived from.
- a mixture (two-component curing urethane-based composition) can be prepared by mixing (A) a main agent and (B) a curing agent.
- the working atmosphere when the main agent (A) and the curing agent (B) are mixed may be, for example, 10 to 35 ° C. and 40 to 60% RH (relative humidity).
- the method of mixing the main agent (A) and the curing agent (B) is not particularly limited, and for example, a method of mixing by hand coating using a normal caulking gun may be used, and a fixed amount is used for sending the raw material.
- a method may be used in which a flexible pump (for example, a gear pump, a plunger pump) and a throttle valve are used in combination and mixed using a mechanical rotary mixer, a static mixer or the like.
- the prepared mixture (two-component curable urethane-based composition) can be an adhesive that adheres the base materials to each other by curing.
- the conditions for curing the mixture may be, for example, 10 to 35 ° C. for 3 to 7 days.
- the method for producing a structure of one embodiment is a structure in which a first base material and a second base material are bonded together via a mixture obtained by mixing a main agent and a curing agent in the above-mentioned adhesive set. It has a process to obtain a body.
- Examples of the structure include a back door panel, a boot lid, a windshield, and the like.
- At least one of the first base material and the second base material may be a polypropylene base material.
- the base material other than the polypropylene base material in the first base material and the second base material include polyvinyl chloride, acryliconitrile / butadiene / styrene copolymer (ABS), polycarbonate (PC), polyamide (PA), and poly ().
- Plastic groups such as methyl methacrylate (PMMA), polyester, epoxy resin, polyurethane (PUR), polyoxymethylene (POM), polyethylene (PE), ethylene / propylene copolymer (EPM), ethylene / propylene / diene polymer (EPDM)
- PMMA methyl methacrylate
- PUR polyurethane
- POM polyoxymethylene
- PE polyethylene
- EPM ethylene / propylene copolymer
- EPDM ethylene / propylene / diene polymer
- fiber reinforced plastic base materials such as materials, carbon fiber reinforced plastics (CFRP) and glass fiber reinforced plastics (GFRP), and resin compound base materials such as sheet molding compounds (SMC).
- the structure is a vehicle back door.
- the first base material may be an inner panel made of a polypropylene base material
- the second base material may be an outer panel.
- the equivalent ratio (NCO group / OH group) of the isocyanate group (NCO) in the (A) main agent to the hydroxyl group (OH) in the (B) curing agent may be, for example, 1.0 to 5.0.
- the working atmosphere when mixing the (A) main agent and (B) curing agent in the adhesive set may be, for example, 10 to 35 ° C. and 40 to 60% RH (relative humidity).
- the conditions for curing the mixture may be, for example, 10-35 ° C. for 3-7 days.
- the reaction product mainly contains a modified product A having an isocyanate group modified with 3-mercaptopropyltrimethoxysilane and two unmodified isocyanate groups. It is speculated.
- N-phenyl-3-aminopropyltrimethoxysilane (trade name: KBM-573, manufactured by Shin-Etsu Chemical Co., Ltd.) was added to the NH group of N-phenyl-3-aminopropyltrimethoxysilane. 42 g was added, which is an amount such that the equivalent ratio of NCO groups (NCO group / NH group) of the biuret trimer of hexamethylene diisocyanate is 3.4. Then, the reaction was carried out at 40 ° C. for about 60 minutes in a nitrogen atmosphere to obtain a reaction product having an NCO content of 5.7%.
- the reaction product is a modified product B having an isocyanate group modified with N-phenyl-3-aminopropyltrimethoxysilane and two unmodified isocyanate groups. It is presumed that it mainly contains.
- the reaction mixture mainly contains a modified product C having an isocyanate group modified with 3-mercaptopropyltrimethoxysilane and at least two unmodified isocyanate groups. It is speculated.
- the kneading container was heated until the content reached 100 ° C., the pressure was reduced to 2.7 kPa (20 mmHg) inside the kneading container by a vacuum pump, and the content was stirred for 1 hour. The temperature of the contents was cooled to 40 ° C., which was used as a curing agent.
- Example 2 (Main agent) 4.2 g of the modified product B of Production Example 2 was added to the intermediate product of the main agent, and the mixture was stirred for 10 minutes to obtain the main agent of Example 2. (Hardener) The curing agent prepared above was used as it was as the curing agent of Example 2.
- Example 3 (Main agent) 2.1 g of the modified product A of Production Example 1 and 2.1 g of the modified product B of Production Example 2 were added to the intermediate product of the main agent, and the mixture was stirred for 10 minutes to obtain the main agent of Example 3. (Hardener) The curing agent prepared above was used as it was as the curing agent of Example 3.
- ⁇ Comparative example 1> (Main agent) Biuret trimer of hexamethylene diisocyanate (trade name: Duranate 24A-100, manufactured by Asahi Kasei Corporation) 3.15 g and 3-mercaptopropyltrimethoxysilane (trade name: KBM-803, Shin-Etsu Chemical Co., Ltd.) are added to the above intermediate products.
- the main agent of Comparative Example 1 was obtained by adding 1.05 g (manufactured by the company) and stirring for 10 minutes. (Hardener) The curing agent prepared above was used as it was as the curing agent of Comparative Example 1.
- the mixed mass ratio of the main agent and the curing agent was 1: 1.
- Non-primer adhesiveness Two frame-treated glass fiber-reinforced polypropylene base materials were prepared. A mixture obtained by mixing the main agents and curing agents of Examples 1 to 3 and Comparative Examples 1 and 2 described above was applied to one of the base materials so as to have a thickness of 3 mm, and the adhesive area was 250 mm 2 (25 mm). A test piece was prepared by laminating with the surface of the other base material so as to have a size of ( ⁇ 10 mm) and crimping. The prepared test body was cured at 23 ° C. for 72 hours to obtain a test body after curing. The obtained test piece was subjected to a tensile test according to JIS K6850: 1999 at 23 ° C., and the shear strength was measured.
- CF100 indicates that the mixture (adhesive) after curing caused cohesive failure in the entire area (100%) of the adhesive surface.
- CF50 indicates that the mixture (adhesive) after curing caused cohesive failure at 50% and 30% with respect to the adhesive surface, respectively.
- the larger the ratio of cohesive failure to the adhesive surface the better the heat aging resistance.
- Table 1 shows the composition of the ingredients and the evaluation results.
- the adhesive set of Examples 1 to 3 using the main agent containing the modified product A of Production Example 1 and the modified product B of Production Example 2 as the component (b) contains such a main agent.
- the shear strength of the adhesive was excellent, and further, the heat aging resistance was also excellent. From these results, it was confirmed that the adhesive set of the present invention can prepare an adhesive having excellent non-primer adhesiveness and also excellent heat aging resistance.
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Abstract
Description
一実施形態に係る接着剤セットは、主剤と硬化剤とで構成される。本実施形態に係る接着剤セットは、主剤と硬化剤とを混合することによって、混合物(二液硬化型ウレタン系組成物)を調製することができる。混合物(二液硬化型ウレタン系組成物)は時間経過とともに硬化し、基材同士を接着する接着剤として作用し得る。
(a)成分は、活性水素基を2個以上有する化合物とイソシアネート基を2個以上有するポリイソシアネート化合物との反応生成物である。(a)成分は、イソシアネート基の数が過剰となるように反応させることによって、末端基としてイソシアネート基を有するものを得ることができる。活性水素基としては、例えば、ヒドロキシ基(OH基)、カルボキシル基(COOH基)、アミノ基(NH2基)、メルカプト基(SH基)等が挙げられる。活性水素基を2個以上有する化合物は、ヒドロキシ基(OH基)を2個以上有する化合物であるポリオールであってよく、(a-1)ポリエーテルポリオールであってもよい。
(a-1)成分は、OH基を2個以上有するポリエーテルポリオールであれば特に制限されない。具体的には、ポリエチレングリコール(PEG)、ポリプロピレングリコール(PPG)、エチレンオキサイド/プロピレンオキサイド共重合体、ポリテトラメチレンエーテルグリコール(PTMEG)、ソルビトール系ポリオール等が挙げられる。これらの中でも、(a-1)成分は、ポリプロピレングリコール(PPG)であってよい。また、(a-1)成分は、1種を単独で用いてもよく、2種以上を併用してもよい。
GPC測定条件は、下記のとおりである。
測定器:ACQUITY UPLC APCシステム(Waters社製)
カラム:APC XT-900、APC XT-200、APC XT-125、APC XT-45 (Waters社製)
キャリア:テトラヒドロフラン(THF)
検出器:示差屈折
サンプル:0.5質量%THF溶液
検量線:ポリスチレン
(a-2)成分としては、例えば、4,4’-ジフェニルメタンジイソシアネート(4,4’-MDI(モノメリックMDI))、2,4’-ジフェニルメタンジイソシアネート)(2,4’-MDI)等が挙げられる。
(b)成分は、メルカプト基又はアミノ基を有するシランカップリング剤で変性されているイソシアネート基及び少なくとも2つの未変性のイソシアネート基を有するヘキサメチレンジイソシアネートの多量体である。(b)成分は、(b-1)未変性のイソシアヌレート基を有するヘキサメチレンジイソシアネートの多量体(以下、「未変性ヘキサメチレンジイソシアネート多量体」という場合がある。)と(b-2)メルカプト基又はアミノ基を有するシランカップリング剤との反応生成物である。当該反応生成物を(b)成分として用いる場合、反応生成物は、(b)成分以外に、(b-1)成分、(b-2)成分で変性されているイソシアネート基及び1つの未変性のイソシアネート基を有するヘキサメチレンジイソシアネートの多量体等を含むものであってよい。(b-1)成分として、未変性ヘキサメチレンジイソシアネート3量体を用いる場合、(b)成分は、(b-2)成分で変性されているイソシアネート基及び2つの未変性のイソシアネート基を有するヘキサメチレンジイソシアネートの3量体であってよい。(b)成分における(b-2)成分で変性されているイソシアネート基は、ポリプロピレン基材との界面接着力の向上に寄与し、少なくとも2つの未変性のイソシアネート基は、硬化剤に含まれる(c)ポリオールとの架橋形成に寄与し得る。そのため、このような(b)成分を含む主剤を用いることによって、接着剤セットは、ノンプライマー接着性に優れ、さらには耐熱老化性にも優れる接着剤を調製することが可能となる。
(b-1)成分は、未変性のイソシアネート基を有するヘキサメチレンジイソシアネートの多量体であれば特に制限されないが、例えば、イソシアヌレート体、ビウレット体、トリメチロールプロパン(TMP)のアダクト体等の3量体であってよい。このような3量体の市販品としては、例えば、スミジュールN3300(商品名、住化バイエルウレタン株式会社製)、デュラネート24A-100(商品名、旭化成株式会社製)、デュラネートE402-100(商品名、旭化成株式会社製)等が挙げられる。(b-1)成分は、1種を単独で用いてもよく、2種以上を併用してもよい。
メルカプト基を有するシランカップリング剤は、(b-1)成分のイソシアヌレート基と反応し得る活性水素基であるメルカプト基(SH基)及び加水分解性基を有するシラン化合物である。メルカプト基を有するシランカップリング剤としては、例えば、3-メルカプトプロピルメチルジメトキシシラン、3-メルカプトプロピルトリメトキシシラン等が挙げられる。メルカプト基を有するシランカップリング剤は、1種を単独で用いてもよく、2種以上を併用してもよい。また、後述のアミノ基を有するシランカップリング剤と組み合わせて用いてもよい。
(c)成分は、OH基を2個以上有するポリオールであれば特に制限されないが、例えば、上述の(a-1)成分で例示したポリエーテルポリオールを使用することができる。(c)成分の数平均分子量は、(a-1)成分の数平均分子量と同様であってよい。
(d)成分は、ウレタン化反応又は尿素化反応を促進する公知の触媒が使用できる。(d)成分としては、例えば、スズ触媒、アミン触媒等が挙げられ、所望の硬化速度に合わせて適宜選択することができる。スズ触媒としては、例えば、ジブチルスズジラウレート、ジオクチルスズジラウレート、ジブチルスズジデカネート、ジオクチルスズジデカネート、2-エチルヘキサン酸スズ等が挙げられる。アミン触媒としては、例えば、トリエチレンジアミン、ビス(ジメチルアミノエチル)エーテル、ジ(N,N-ジメチルアミノエチル)アミン等が挙げられる。
(e)成分は、その平均粒子径(D50:体積粒度分布曲線の50%値の粒径)が20~40nm又は25~35nmであるものであってよい。カーボンブラックの平均粒子径が上記範囲であることによって、接着剤の粘性及びカーボンブラックの分散性がより適切な範囲に調整され、接着剤の作業性及び強度がより向上する傾向にある。なお、カーボンブラックの平均粒子径(D50)は、例えば、ベックマン・コールター社製「モデルLS-230」を用いて、レーザー回折光散乱法によって測定することができる。
(f)成分としては、上述の(e)成分の他に、カオリン、タルク、シリカ、酸化チタン、炭酸カルシウム、ベントナイト、マイカ、セリサイト、ガラスフレーク、ガラス繊維、黒鉛、水酸化マグネシウム、水酸化アルミニウム、三酸化アンチモン、硫酸バリウム、ホウ酸亜鉛、アルミナ、マグネシア、ウォラストナイト、ゾノトライト、ウィスカー等が挙げられる。
(g)成分としては、例えば、フタル酸エステル系化合物、アルキルスルホン酸エステル系化合物、アジピン酸エステル系化合物等が挙げられる。フタル酸エステル系化合物の具体例としては、フタル酸ジオクチル(DOP)、フタル酸ジブチル(DBP)、フタル酸ジイソノニル(DINP)、フタル酸ジイソデシル(DIDP)、フタル酸ブチルベンジル(BBP)等が挙げられる。
(製造例1:変性ヘキサメチレンジイソシアネート多量体(変性体A)の合成)
未変性ヘキサメチレンジイソシアネート多量体である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(3量体)(商品名:スミジュールN3300、住化バイエルウレタン株式会社製)100g及び可塑剤としてのフタル酸ジイソノニル150gをフラスコに投入して100~120℃に加熱し、脱気しながら撹拌して水分率が0.01%以下になるまで脱水した。その後、40℃まで冷却し、3-メルカプトプロピルトリメトキシシラン(商品名:KBM-803、信越化学株式会社製)を、3-メルカプトプロピルトリメトキシシランのSH基に対するヘキサメチレンジイソシアネートのイソシアヌレート3量体のNCO基の当量比(NCO基/SH基)が3.1となる量である33gを添加した。ジブチルスズジラウレート(商品名:KS-1260、堺化学工業株式会社製)を0.02g添加した後、窒素雰囲気下、40℃で約60分間反応させ、NCO含有量が5.2%である反応生成物を得た。NCO基/SH基が3.1であることから、反応生成物は、3-メルカプトプロピルトリメトキシシランで変性されているイソシアネート基及び2つの未変性のイソシアネート基を有する変性体Aを主に含むことが推測される。
未変性ヘキサメチレンジイソシアネート多量体であるヘキサメチレンジイソシアネートのビウレット体(3量体)(商品名:デュラネート24A-100、旭化成株式会社製)100g及び可塑剤としてのフタル酸ジイソノニル150gをフラスコに投入して100~120℃に加熱し、脱気しながら撹拌して水分率が0.01%以下になるまで脱水した。その後、40℃まで冷却し、N-フェニル-3-アミノプロピルトリメトキシシラン(商品名:KBM-573、信越化学株式会社製)を、N-フェニル-3-アミノプロピルトリメトキシシランのNH基に対するヘキサメチレンジイソシアネートのビウレット3量体のNCO基の当量比(NCO基/NH基)が3.4となる量である42gを添加した。その後、窒素雰囲気下、40℃で約60分間反応させ、NCO含有量が5.7%である反応生成物を得た。NCO基/NH基が3.4であることから、反応生成物は、N-フェニル-3-アミノプロピルトリメトキシシランで変性されているイソシアネート基及び2つの未変性のイソシアネート基を有する変性体Bを主に含むことが推測される。
トルエンジイソシアネートのイソシアヌレート体(3量体)(商品名:D-204、三井化学ポリウレタン株式会社製)100g及び可塑剤としてのフタル酸ジイソノニル150gをフラスコに投入して100~120℃に加熱し、脱気しながら撹拌して水分率が0.01%以下になるまで脱水した。その後、40℃まで冷却し、3-メルカプトプロピルトリメトキシシラン(商品名:KBM-803、信越化学株式会社製)を、3-メルカプトプロピルトリメトキシシランのSH基に対するトルエンジイソシアネートのイソシアヌレート体のNCO基の当量比(NCO基/SH基)が3.0となる量である11.5gを添加した。ジブチルスズジラウレート(商品名:KS-1260、堺化学工業株式会社製)を0.02g添加した後、窒素雰囲気下、40℃で約60分間反応させ、NCO含有量が1.9%である反応混合物を得た。NCO基/SH基が3.0であることから、反応混合物は、3-メルカプトプロピルトリメトキシシランで変性されているイソシアネート基及び少なくとも2つの未変性のイソシアネート基を有する変性体Cを主に含むことが推測される。
(主剤中間品の調製)
撹拌機、窒素導入管、真空ポンプ、及び加熱冷却装置付き混練容器に、エクセノール837(ポリプロピレングリコール、旭硝子株式会社製、数平均分子量:6000、官能基数:3)24.2g、エクセノール2020(ポリプロピレングリコール、旭硝子株式会社製、数平均分子量:2000、官能基数:2)6.0g、モナーク460(カーボンブラック、キャボットコーポレーション社製)13.8g、アイスバーグ(焼成カオリン、白石カルシウム株式会社製)27.5g、及びDINP(フタル酸ジイソノニル)17.1gを仕込み、カーボンブラックの塊がなくなるまで、室温(25℃)で30分間撹拌した。次いで、内容物が100℃となるまで混練容器を加熱し、真空ポンプにより混練容器内部が2.7kPa(20mmHg)になるまで減圧して、内容物を1時間撹拌した。次いで、内容物の温度が70℃になるまで冷却し、混練容器にミリオネートMT(4,4’-ジフェニルメタンジイソシアネート、東ソー株式会社製、NCO含有量:33.6%)7.3g及びKS-1260(ジブチルスズジラウレート、堺化学工業株式会社製)を0.02g添加した後、窒素を導入し、内容物を1時間撹拌した。内容物の温度を40℃になるまで冷却し、これを主剤中間品とした。
撹拌機、窒素導入管、真空ポンプ、及び加熱冷却装置付き混練容器に、エクセノール837(ポリプロピレングリコール、旭硝子株式会社製、数平均分子量:6000、官能基数:3)41.6g、エクセノール2020(ポリプロピレングリコール、旭硝子株式会社製、数平均分子量:2000、官能基数:2)10.4g、EDP-1100(ポリプロピレングリコール、株式会社ADEKA製、数平均分子量:260、官能基数:4)1.2g、モナーク460(カーボンブラック、キャボットコーポレーション社製)18.3g、アイスバーグ(焼成カオリン、白石カルシウム株式会社製)11.8g、DINP(フタル酸ジイソノニル)15.2g、BHT(ジブチルヒドロキシトルエン)0.3g、脱水剤モレキュラーシーブ4A(脱水剤)0.6g、及びKS-1260(ジブチルスズジラウレート、堺化学工業株式会社製)0.6gを仕込み、カーボンブラックの塊がなくなるまで、室温(25℃)で30分間撹拌した。次いで、内容物が100℃となるまで混練容器を加熱し、真空ポンプにより混練容器内部が2.7kPa(20mmHg)になるまで減圧して、内容物を1時間撹拌した。内容物の温度を40℃になるまで冷却し、これを硬化剤とした。
<実施例1>
(主剤)
上記主剤中間品に、製造例1の変性体A4.2gを添加し、10分間撹拌することによって、実施例1の主剤を得た。
(硬化剤)
上記で調製した硬化剤をそのまま実施例1の硬化剤として用いた。
(主剤)
上記主剤中間品に、製造例2の変性体B4.2gを添加し、10分間撹拌することによって、実施例2の主剤を得た。
(硬化剤)
上記で調製した硬化剤をそのまま実施例2の硬化剤として用いた。
(主剤)
上記主剤中間品に、製造例1の変性体A2.1g及び製造例2の変性体B2.1gを添加し、10分間撹拌することによって、実施例3の主剤を得た。
(硬化剤)
上記で調製した硬化剤をそのまま実施例3の硬化剤として用いた。
(主剤)
上記主剤中間品に、ヘキサメチレンジイソシアネートのビウレット3量体(商品名:デュラネート24A-100、旭化成株式会社製)3.15g及び3-メルカプトプロピルトリメトキシシラン(商品名:KBM-803、信越化学株式会社製)1.05gを添加し、10分間撹拌することによって、比較例1の主剤を得た。
(硬化剤)
上記で調製した硬化剤をそのまま比較例1の硬化剤として用いた。
(主剤)
上記主剤中間品に、比較製造例1の変性体C4.2gを添加し、10分間撹拌することによって、比較例2の主剤を得た。
(硬化剤)
上記で調製した硬化剤をそのまま比較例2の硬化剤として用いた。
フレーム処理を行ったガラス繊維強化ポリプロピレン基材を2枚用意した。上述の実施例1~3及び比較例1、2の主剤及び硬化剤を混合して得られた混合物を、一方の基材に厚みが3mmとなるように塗布し、接着面積が250mm2(25mm×10mm)になるように他方の基材の表面と張り合わせ、圧着させることによって試験体を作製した。作製した試験体を23℃で72時間養生し、養生後の試験体を得た。得られた試験体に対して、23℃において、JIS K6850:1999に準じた引張試験を行い、せん断強度を測定した。
上述の実施例1~3及び比較例1、2の主剤及び硬化剤を混合して得られた混合物を、ガラスフィラー含有ポリプロピレン基材に厚みが5mmとなるように塗布し、塗布した基材を23℃で72時間養生することによって試験体を作製した。各試験体を90℃で2週間加熱し、加熱後の混合物(接着剤)をナイフでカットし、カット部分を手で摘まんで引っ張ることによって剥離させ、その剥離状態を観察した(ナイフカットによる手剥離試験)。なお、表1中、「CF100」は、養生後の混合物(接着剤)が、接着面の全域(100%)において凝集破壊が発生したことを示す。「CF50」及び「CF30」は、養生後の混合物(接着剤)が、それぞれ接着面に対して50%及び30%において凝集破壊が発生したことを示す。なお、本試験においては、接着面に対する凝集破壊の割合が大きいほど、耐熱老化性に優れることを意味する。
Claims (4)
- 主剤と硬化剤とで構成される接着剤セットであって、
前記主剤が、末端基としてイソシアネート基を有するウレタンプレポリマーと、メルカプト基又はアミノ基を有するシランカップリング剤で変性されているイソシアネート基及び少なくとも2つの未変性のイソシアネート基を有するヘキサメチレンジイソシアネートの多量体とを含有し、
前記硬化剤が、ポリオールを含有する、接着剤セット。 - 前記多量体が、メルカプト基又はアミノ基を有するシランカップリング剤で変性されているイソシアネート基及び2つの未変性のイソシアネート基を有するヘキサメチレンジイソシアネートの3量体である、請求項1に記載の接着剤セット。
- 前記主剤及び前記硬化剤の少なくとも一方が、硬化触媒をさらに含有する、請求項1又は2に記載の接着剤セット。
- 請求項1~3のいずれか一項に記載の接着剤セットにおける前記主剤と前記硬化剤とを混合して得られる混合物を介して、第1の基材と第2の基材とを貼り合わせて構造体を得る工程を備える、構造体の製造方法。
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US17/600,219 US20220204824A1 (en) | 2019-04-05 | 2019-04-05 | Adhesive agent set and method for manufacturing structural body |
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JP4997923B2 (ja) * | 2006-10-31 | 2012-08-15 | 横浜ゴム株式会社 | 硬化性樹脂組成物 |
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JP2004131625A (ja) | 2002-10-11 | 2004-04-30 | Yokohama Rubber Co Ltd:The | 二液型硬化性組成物 |
JP2006213801A (ja) * | 2005-02-02 | 2006-08-17 | Mitsui Chemicals Polyurethanes Inc | 2液硬化型無溶剤系接着剤 |
JP2006220200A (ja) * | 2005-02-09 | 2006-08-24 | Kurashiki Kako Co Ltd | 防振構造体及びその製造方法 |
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