WO2017187968A1 - 湿気硬化型反応性ホットメルト接着剤組成物及びその製造方法 - Google Patents
湿気硬化型反応性ホットメルト接着剤組成物及びその製造方法 Download PDFInfo
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- WO2017187968A1 WO2017187968A1 PCT/JP2017/014845 JP2017014845W WO2017187968A1 WO 2017187968 A1 WO2017187968 A1 WO 2017187968A1 JP 2017014845 W JP2017014845 W JP 2017014845W WO 2017187968 A1 WO2017187968 A1 WO 2017187968A1
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- polyester polyol
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- 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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- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C09J175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
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- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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- C08G18/4825—Polyethers containing two hydroxy groups
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
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- C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
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Definitions
- the present invention relates to a moisture curable reactive hot melt adhesive composition and a method for producing the same.
- the hot melt type adhesive is a solvent-free type adhesive, and therefore has a low load on the environment and the human body, and can be bonded in a short time. Therefore, the hot melt type adhesive is suitable for improving productivity.
- Hot melt adhesives can be broadly classified into two types, those based on thermoplastic resins and those based on reactive resins.
- As the reactive resin a urethane prepolymer having an isocyanate group at the terminal is mainly used.
- a reactive hot-melt adhesive mainly composed of a urethane prepolymer exhibits a certain degree of adhesive strength in a short time due to cooling and solidification of the adhesive itself after application.
- the reactive hot melt adhesive mainly composed of a urethane prepolymer exhibits good adhesive strength even when heated.
- a reactive hot melt adhesive composition containing a polyurethane prepolymer, a thermoplastic resin and a tackifier with improved initial adhesive strength is also known (see, for example, Patent Documents 1 to 3).
- a double-sided tape is often used for bonding parts such as a display part of a wearable terminal such as a mobile phone. Since the wearable terminal is carried around, it may be accidentally dropped when it is carried or used. For this reason, the bonded portion of the wearable terminal is required to have impact resistance so that the parts bonded together by the impact at the time of dropping do not fall off.
- Patent Document 4 describes a double-sided pressure-sensitive adhesive tape excellent in impact resistance.
- the present invention is a moisture curable reactive hot melt adhesive composition having excellent adhesion, excellent impact resistance, and high reliability while having excellent coating properties capable of adhering parts in the smallest part It is an object to provide a product and a method for manufacturing the product.
- the present invention relates to a moisture curable reactive hot comprising a urethane prepolymer having an isocyanate group, which is a reaction product of a polyol component containing a polyester polyol, a polyether polyol and a polybutadiene polyol and an isocyanate component, and an antioxidant.
- a melt adhesive composition is provided.
- the polybutadiene polyol may contain 20% or more of a structural unit having a 1,2-vinyl bond represented by the following formula (1). Further, the blending amount of the polybutadiene polyol may be 5 to 45 parts by mass based on 100 parts by mass of the total amount of the polyol components.
- the content of the antioxidant may be 0.08 to 5 parts by mass with respect to 100 parts by mass of the urethane prepolymer having an isocyanate group.
- the present invention is also a method for producing a moisture curable reactive hot melt adhesive composition
- a moisture curable reactive hot melt adhesive composition comprising a urethane prepolymer having an isocyanate group and an antioxidant, comprising a polyester polyol, a polyether polyol and a polybutadiene polyol.
- a method comprising a step of reacting a polyol component and an isocyanate component to obtain a urethane prepolymer having an isocyanate group.
- a moisture-curable reactive hot melt that has excellent adhesion, excellent impact resistance, and high reliability while having excellent application properties that allow adhesion between parts in a minimal portion.
- An adhesive composition and a method for producing the same can be provided.
- a numerical range indicated by using “to” indicates a range including the numerical values described before and after “to” as the minimum value and the maximum value, respectively.
- the upper limit value or the lower limit value of a numerical range in a certain step may be replaced with the upper limit value or the lower limit value of a numerical range in another step.
- the upper limit value or the lower limit value of the numerical range may be replaced with the values shown in the examples.
- “A or B” only needs to include either A or B, and may include both.
- the materials exemplified in the present specification can be used singly or in combination of two or more unless otherwise specified.
- the content of each component in the composition means the total amount of the plurality of substances present in the composition unless there is a specific notice when there are a plurality of substances corresponding to each component in the composition. means.
- open time refers to the time during which the adhesive composition can be bonded after application.
- initial adhesiveness refers to the adhesive strength after 1 hour has elapsed after the adhesive composition is melted and applied to an adherend, and “adhesiveness” refers to 7 days It means the adhesive strength after the past.
- the moisture-curable reactive hot melt adhesive composition of the present embodiment includes a polyol component and an isocyanate component containing polyester polyol, polyether polyol and polybutadiene polyol. It contains the urethane prepolymer which has an isocyanate group which is a reaction material, and antioxidant.
- a moisture curable reactive hot melt adhesive composition is a polymer that reacts with moisture in the air or moisture on the surface of the adherend to increase the molecular weight and develop adhesiveness.
- the adhesive composition according to the present embodiment has a good viscosity, it has an excellent coating property capable of adhering parts at a minimum portion. And the hardened
- the urethane prepolymer having an isocyanate group includes a polyol component essentially comprising a polyester polyol, a polyether polyol, and a polybutadiene polyol, and an isocyanate component. It is made to react and has an isocyanate group at the terminal of the urethane prepolymer. Thereby, the outstanding adhesiveness and the outstanding impact resistance can be exhibited after moisture hardening.
- the reactive urethane prepolymer has a structural unit derived from a polyol component containing polyester polyol, polyether polyol and polybutadiene polyol, and a structural unit derived from an isocyanate component.
- the solidification time and viscosity can be adjusted.
- a compound produced by a polycondensation reaction between a polyhydric alcohol and a polycarboxylic acid can be used as the polyester polyol.
- the polyester polyol has, for example, a polyhydric alcohol having 2 to 15 carbon atoms and 2 or 3 hydroxyl groups, and 2 to 14 carbon atoms (including carbon atoms in a carboxyl group). It may be a polycondensate with a polycarboxylic acid having 6 carboxyl groups.
- the polyester polyol may be a linear polyester diol produced from a diol and a dicarboxylic acid, or a branched polyester triol produced from a triol and a dicarboxylic acid. Branched polyester triols can also be obtained by reaction of diols with tricarboxylic acids.
- polyhydric alcohol examples include ethylene glycol, 1,2-propanediol, 1,3-propanediol, butanediol isomers, pentanediol isomers, hexanediol isomers, 2,2- Dimethyl-1,3-propanediol, 2-methylpropanediol, 2,4,4-trimethyl-1,6-hexanediol, 2,2,4-trimethyl-1,6-hexanediol, 1,4-cyclohexane Examples include diols and aliphatic or alicyclic diols such as 1,4-cyclohexanedimethanol; aromatic diols such as 4,4′-dihydroxydiphenylpropane, bisphenol A, bisphenol F, pyrocatechol, resorcinol, and hydroquinone.
- a polyhydric alcohol may be used individually by 1 type, and may be used in combination of 2 or more type. Among
- polycarboxylic acid examples include aromatic polycarboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, 1,2,4-benzenetricarboxylic acid; maleic acid, fumaric acid, aconitic acid, 1,2,3-propane Aliphatic acids such as tricarboxylic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, sebacic acid, cyclohexane-1,2-dicarboxylic acid, 1,4-cyclohexanediene-1,2-dicarboxylic acid Or alicyclic polycarboxylic acid is mentioned.
- a polycarboxylic acid may be used individually by 1 type, and may be used in combination of 2 or more type.
- a polycarboxylic acid derivative such as a carboxylic acid anhydride or a compound in which a part of the carboxyl group is esterified can also be used.
- the polycarboxylic acid derivative include dodecyl maleic acid and octadecenyl maleic acid.
- polyester polyol examples include a crystalline polyester polyol and an amorphous polyester polyol. Judgment of crystallinity and non-crystallinity is judged in the state at 25 ° C.
- a polyester polyol that is crystalline at 25 ° C. is referred to as a crystalline polyester polyol
- a polyester polyol that is amorphous at 25 ° C. is referred to as an amorphous polyester polyol.
- the polyester polyol preferably contains a crystalline polyester polyol and an amorphous polyester polyol from the viewpoints of applicability and initial adhesiveness of the adhesive composition.
- the number average molecular weight (Mn) of the crystalline polyester polyol is preferably in the range of 500 to 10,000, more preferably in the range of 800 to 9000, and still more preferably in the range of 1000 to 8000, from the viewpoint of waterproofness and adhesiveness.
- the number average molecular weight is a value measured by gel permeation chromatography (GPC) and converted to standard polystyrene. The measurement of GPC can be performed under the following conditions.
- Examples of the amorphous polyester polyol include an amorphous polyester polyol having a molecular weight of 3000 or less and an amorphous polyester polyol having a molecular weight of 5000 or more.
- the number average molecular weight of the amorphous polyester polyol having a molecular weight of 3000 or less is preferably in the range of 500 to 3000, more preferably in the range of 1000 to 3000, from the viewpoint of further improving the adhesiveness of the adhesive composition.
- the number average molecular weight of the amorphous polyester polyol having a molecular weight of 5000 or more is preferably in the range of 5000 to 9000, and more preferably in the range of 7000 to 8000, from the viewpoint of further improving impact resistance.
- the polyester polyol may be used alone or in combination of two or more.
- the content of the polyester polyol is preferably 40 to 70 parts by mass, more preferably 45 to 65 parts by mass based on 100 parts by mass of the total amount of polyol components from the viewpoint of further improving the adhesiveness.
- polyether polyol By including a structural unit derived from polyether polyol, it is possible to adjust an appropriate melt viscosity and open time after application of the adhesive composition, and to impart excellent workability, adhesion, waterproofness and flexibility. Can do.
- the polyether polyol include polyethylene glycol, polypropylene glycol, polybutylene glycol, polytetramethylene glycol, and ethylene oxide-modified polypropylene glycol.
- the number average molecular weight of the polyether polyol is preferably in the range of 500 to 5000, more preferably in the range of 700 to 4500, and more preferably in the range of 1000 to 4000, from the viewpoints of initial adhesiveness, adhesiveness, and appropriate open time after coating. Further preferred.
- a polyether polyol may be used individually by 1 type, and may be used in combination of 2 or more type.
- the content of the polyether polyol is preferably 10 to 30 parts by weight based on 100 parts by weight of the total amount of polyol components, from the viewpoint of easy adjustment to low viscosity and the viewpoint of adhesion to the substrate, and 15 to 25 parts by weight. More preferably, it is part by mass.
- the polybutadiene polyol may be a liquid butadiene copolymer having a hydroxyl group at the molecular end.
- the number average molecular weight of the polybutadiene polyol is preferably 1000 to 5000, more preferably 1000 to 4000, and still more preferably 1200 to 3000. When the number average molecular weight of the polybutadiene polyol is 1000 or more, the impact resistance is easily improved, and when it is 5000 or less, the adhesiveness is hardly lowered.
- the content of the polybutadiene polyol is preferably 5 to 45 parts by weight, more preferably 5 to 40 parts by weight, and more preferably 10 to 35 parts by weight based on 100 parts by weight of the total amount of polyol components. preferable.
- the content of the polybutadiene polyol is 5 parts by mass or more, it becomes easier to improve the impact resistance after moisture curing of the adhesive composition, and when it is 45 parts by mass or less, the adhesive composition is heated and melted. The viscosity at the time does not become too high, and the coating workability tends to be excellent.
- the polybutadiene polyol has, as a structure based on butadiene, a structural unit (I) having a 1,2-vinyl bond represented by the following formula (1) (hereinafter sometimes abbreviated as “structural unit (I)”). ing. From the viewpoint of further improving impact resistance, the polybutadiene polyol preferably has 20% or more of the structural unit (I), more preferably 50% or more, and still more preferably 85% or more. The upper limit value of the ratio of the structural unit (I) may be, for example, 100% or less.
- polybutadiene polyols examples include “G-1000” (manufactured by Nippon Soda Co., Ltd.) (number of hydroxyl groups: 2, number average molecular weight: 1400, proportion occupied by structural unit (I): 85%), Idemitsu Kosan Co., Ltd.
- the trade name “R-45HT” manufactured by the company (number of hydroxyl groups: 2, number average molecular weight: 2800, proportion occupied by structural unit (I): 20%) can be mentioned.
- a polybutadiene polyol may be used individually by 1 type, and may be used in combination of 2 or more type.
- the polyol component may contain a polyol other than polyester polyol, polyether polyol and polybutadiene polyol.
- the isocyanate component examples include aromatic isocyanates such as diphenylmethane diisocyanate, dimethyldiphenylmethane diisocyanate, tolylene diisocyanate, xylylene diisocyanate, and p-phenylene diisocyanate; alicyclic isocyanates such as dicyclohexylmethane diisocyanate and isophorone diisocyanate; hexamethylene diisocyanate Of the aliphatic isocyanate.
- the isocyanate component preferably contains an aromatic diisocyanate and more preferably contains diphenylmethane diisocyanate from the viewpoints of reactivity and adhesiveness.
- An isocyanate component may be used individually by 1 type, and may be used in combination of 2 or more type.
- the method for producing the reactive urethane prepolymer is not particularly limited.
- the reactive urethane prepolymer may be produced, for example, by mixing a polyol with an isocyanate, or by mixing a mixture of a polyester polyol and an isocyanate, a mixture of a polyether polyol and an isocyanate, and a mixture of a polybutadiene polyol and an isocyanate. May be.
- the mixing ratio of the isocyanate component and the polyol component is such that the ratio of isocyanate group (NCO) equivalent of the isocyanate component / hydroxyl group (OH) equivalent of the polyol component is 1.5% NCO / OH. Is preferably from 3.0 to 3.0, more preferably from 1.8 to 2.5.
- NCO isocyanate group
- OH hydroxyl group
- the NCO / OH ratio is 1.5 or more, the resulting reactive urethane prepolymer is prevented from increasing in viscosity, and the workability is easily improved.
- the NCO / OH ratio is 3.0 or less, foaming hardly occurs during the moisture curing reaction of the adhesive composition, and there is a tendency to suppress a decrease in adhesiveness.
- the adhesive composition according to the present embodiment includes a combination of the reactive urethane prepolymer and the antioxidant, so that it has excellent adhesiveness and excellent impact resistance after moisture curing, and has high reliability. Can have.
- antioxidants examples include phenol-based, organic sulfur-based, hindered phenol-based, hindered amine-based, and organic phosphorus-based antioxidants.
- the hindered phenol-based antioxidant pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (product name “SONGNOX1010” manufactured by SONGWON) and n-octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate (manufactured by SONGWON, trade name “SONGNOX1076”) is exemplified.
- organic phosphorus antioxidant tris (2, 4-di-tert-butylphenyl) phosphite (manufactured by SONGWON, trade name “SONGNOX1680”).
- SONGWON trade name “SONGNOX1680”
- the content of the antioxidant in the adhesive composition is preferably 0.05 to 5 parts by mass, and 0.08 to 4.5 parts by mass with respect to 100 parts by mass of the reactive urethane prepolymer. Is more preferably 0.1 to 4 parts by mass.
- the content of the antioxidant is 0.05 parts by mass or more, the adhesive composition has high reliability after being moisture-cured, and when it is 5 parts by mass or less, the storage stability of the adhesive composition is improved. It tends to be excellent.
- thermoplastic polymer e.g., polyethylene glycol dimethacrylate copolymer
- tackifier resin e.g., polyethylene glycol dimethacrylate copolymer
- catalyst e.g., polyethylene glycol
- pigment e.g., polyethylene glycol
- ultraviolet absorber e.g., polyethylene glycol dimethacrylate
- surfactant e.g., sodium bicarbonate
- thermoplastic polymer examples include polyurethane, ethylene copolymer, propylene copolymer, vinyl chloride copolymer, acrylic copolymer, and styrene-conjugated diene block copolymer.
- tackifying resins include rosin resins, rosin ester resins, hydrogenated rosin ester resins, terpene resins, terpene phenol resins, hydrogenated terpene resins, petroleum resins, hydrogenated petroleum resins, coumarone resins, ketone resins, styrene resins, A modified styrene resin, a xylene resin, and an epoxy resin are mentioned.
- the catalyst examples include dibutyltin dilaurate, dibutylthione octate, dimethylcyclohexylamine, dimethylbenzylamine, and trioctylamine.
- the open time of the adhesive composition according to this embodiment is preferably 30 to 300 seconds, more preferably 45 to 280 seconds, and still more preferably 60 to 240 seconds.
- the open time is 30 seconds or longer, the bonding time can be increased, and when it is 300 seconds or shorter, the adhesive force is easily developed immediately after the bonding.
- the applicability of the adhesive composition can be evaluated by measuring the viscosity of the adhesive composition.
- the viscosity measured using a rotational viscometer of the adhesive composition according to this embodiment is preferably 10 Pa ⁇ s or less at 120 ° C., and 8 Pa. -More preferably, it is s or less, More preferably, it is 6 Pa-s or less.
- the lower limit of the viscosity is not limited, but may be 2 Pa ⁇ s or more at 120 ° C., for example.
- the adhesiveness of the adhesive composition can be evaluated by bonding the adherend using the adhesive composition and measuring the adhesive strength after 7 days at 23 ° C.
- the adhesive strength after 7 days is preferably 100 N / 25 mm or more, more preferably 110 N / 25 mm or more, and further preferably 120 N / 25 mm.
- the upper limit of adhesive strength is not specifically limited, For example, 500 N / 25mm or less may be sufficient.
- the reliability of the adhesive composition can be evaluated by measuring the adhesive strength after adhering the adherend using the adhesive composition and storing it under high temperature and high humidity conditions. From the viewpoint of having excellent adhesiveness, the adherend is adhered using the adhesive composition according to the present embodiment, and the adhesive is allowed to stand for 7 days under a high temperature and high humidity condition of a temperature of 85 ° C. and a humidity of 85%.
- the strength is preferably 100 N / 25 mm or more, more preferably 110 N / 25 mm or more, and still more preferably 115 N / 25 mm.
- the upper limit value of the adhesive strength after standing for 7 days is not particularly limited, but may be, for example, 500 N / 25 mm or less.
- the impact resistance of the adhesive composition can also be evaluated by dropping a weight on a laminate obtained by adhering adherends to each other using the adhesive composition and visually confirming the presence or absence of peeling. From the viewpoint of having excellent impact resistance, it is preferable that peeling does not occur when a weight having a load of 300 g is dropped from a height of 250 mm onto the laminate by the method described in Examples described later.
- the adhesive composition according to the present embodiment is manufactured by a method including a step of obtaining a urethane prepolymer having an isocyanate group by reacting a polyol component containing a polyester polyol, a polyether polyol and a polybutadiene polyol with an isocyanate component.
- the adhesive composition according to this embodiment may be prepared, for example, by a method of obtaining a urethane prepolymer having an isocyanate group by reacting a polyol component and an isocyanate component in the presence of an antioxidant. You may produce by the method of mixing antioxidant, after making a component and an isocyanate component react and obtaining the urethane prepolymer which has an isocyanate group.
- the blending amount of the antioxidant is preferably 0.05 to 5 parts by mass, and 0.08 to 5 parts by mass with respect to 100 parts by mass of the total amount of polyol. More preferred is 0.08 to 4.5 parts by mass, still more preferred is 0.1 to 4 parts by mass.
- the moisture curable reactive hot melt adhesive composition of the present embodiment can adhere to adherends by applying to the adherend surface, and is particularly capable of adhering parts at the smallest part. It has excellent adhesion, excellent impact resistance and high reliability while having excellent coating properties.
- the adhesive composition according to the present embodiment can be suitably applied when it is desired to provide impact resistance with a small amount.
- a part is a mass part.
- polyester polyol a crystalline polyester polyol obtained by using adipic acid and 1,6-hexanediol as main components, hydroxyl group number: 2, number average molecular weight: 5000
- polyester polyol b adipic acid and ethylene glycol
- a polyester polyol c amorphous polyester polyol obtained by using isophthalic acid and neopentyl glycol as the main components, the number of hydroxyl groups: 2, number average molecular weight: 2000
- polyester polyol d amorphous polyester polyol obtained by using azelaic acid and ethylene glycol as main components, hydroxyl group number: 2, number average molecular weight: 8000).
- Polypropylene glycol (number of hydroxyl groups: 2, number average molecular weight: 2000) was prepared as a polyether polyol.
- polybutadiene polyol polybutadiene polyol a (number of hydroxyl groups: 2, number average molecular weight: 1400, proportion occupied by structural unit (I): 85%, Nippon Soda Co., Ltd., trade name “G-1000”), and polybutadiene polyol b (number of hydroxyl groups: 2, number average molecular weight: 2800, proportion occupied by structural unit (I): 20%, manufactured by Idemitsu Kosan Co., Ltd., trade name “R-45HT”) was prepared.
- isocyanate component diphenylmethane diisocyanate (isocyanate group number: 2) was prepared.
- antioxidant As the antioxidant, a product name “SONGNOX1076” manufactured by SONGWON, which is a hindered phenol-based antioxidant, was prepared.
- Example 1 Add 10 parts of polyester polyol a, 45 parts of polyester polyol b, 8 parts of polyester polyol c3 parts, polyester polyol d3 parts, polypropylene glycol 24 parts and polybutadiene polyol a10 parts that have been dehydrated in advance by a vacuum dryer, and 0.2 parts of antioxidant. Then, 24 parts of diphenylmethane diisocyanate was further added and mixed uniformly. Next, the obtained mixture was reacted at 110 ° C. for 1 hour, and further degassed and stirred under reduced pressure at 110 ° C. for 1 hour to obtain an adhesive composition containing a urethane prepolymer having an isocyanate group.
- Example 2 As a polyol component, polyester polyol a 10 parts, polyester polyol b 40 parts, polyester polyol c 7 parts, polyester polyol d 3 parts, polypropylene glycol 20 parts and polybutadiene polyol b 20 parts, except that the amount of diphenylmethane diisocyanate was changed to 22 parts, In the same manner as in Example 1, an adhesive composition was obtained.
- Example 3 As the polyol component, polyester polyol a8 parts, polyester polyol b33 parts, polyester polyol c6 parts, polyester polyol d2 parts, polypropylene glycol 16 parts and polybutadiene polyol a35 parts were used, except that the amount of diphenylmethane diisocyanate was changed to 27 parts. In the same manner as in Example 1, an adhesive composition was obtained.
- Example 4 As the polyol component, polyester polyol a 10 parts, polyester polyol b 40 parts, polyester polyol c 7 parts, polyester polyol d 3 parts, polypropylene glycol 20 parts and polybutadiene polyol a 20 parts were used, and the blending amount of the antioxidant was changed to 0.1 part. Except for this, an adhesive composition was obtained in the same manner as Example 1.
- Example 5 An adhesive composition was obtained in the same manner as in Example 4 except that the blending amount of the antioxidant was changed to 3 parts.
- Example 6 An adhesive composition was obtained in the same manner as in Example 4 except that the amount of the antioxidant was changed to 5 parts.
- polyester polyol a13 parts, polyester polyol b50 parts, polyester polyol c9 parts, polyester polyol d3 parts, and polypropylene glycol 25 parts were used as in Example 1 except that the amount of diphenylmethane diisocyanate was changed to 22 parts. Thus, an adhesive composition was obtained.
- Example 4 As a polyol component, polyester polyol a13 parts, polyester polyol b50 parts, polyester polyol c9 parts, polyester polyol d3 parts and polybutadiene polyol b25 parts were used, and the same procedure as in Example 1 was carried out except that the amount of diphenylmethane diisocyanate was changed to 21 parts. Thus, an adhesive composition was obtained.
- a polycarbonate film having a length of 250 mm ⁇ width of 25 mm ⁇ thickness of 100 ⁇ m was pressure-bonded onto the adhesive layer to prepare a test piece.
- a 90 ° peel test peel speed: 200 mm / min
- an adhesive strength N / 25 mm
- a polycarbonate film having a length of 250 mm ⁇ width of 25 mm ⁇ thickness of 100 ⁇ m was pressure-bonded onto the adhesive layer to prepare a test piece. The test piece was allowed to stand for 7 days in an environment of a temperature of 23 ° C.
- the adhesive composition was melted at 100 ° C., and a test piece formed into a film shape having a length of 15 mm ⁇ width of 40 mm ⁇ thickness of 100 ⁇ m was prepared and left for 7 days in a constant temperature and humidity chamber at a temperature of 23 ° C. and a humidity of 50%. Then, using Autograph AGS-X (manufactured by Shimadzu Corporation), the tensile elastic modulus (MPa), breaking strength (MPa), and breaking elongation (%) of the adhesive layer were measured according to JIS K-7127. did.
- a syringe container made by Musashi Engineering Co., Ltd., trade name “Musashi Engineering Co., Ltd., trade name“ SHN-0.25N ”) having an adhesive composition melted at 100 ° C. and fitted with a precision nozzle (Musashi Engineering Co., Ltd., trade name“ SHN-0.25N ”).
- adherend A Polycarbonate plate: Draw a 40mm x 40mm square over the hole on a 100mm wide x 50mm long x 2mm thick hole with an inner diameter of 20mm at the center, and adherend B (acrylic board: 50mm wide x length) 50 mm ⁇ thickness 4 mm), and the adhesive layer is adjusted to have a width of 0.3 mm and a thickness of 0.1 mm. Adhesive layer and the adherend B was produced a laminate are laminated in this order.
- the adherend B side of the laminate After being left for 3 days in an environment at a temperature of 23 ° C. and a humidity of 50%, in an environment of a temperature of 23 ° C. and a humidity of 50%, the adherend B side of the laminate is directed downward.
- a DuPont impact machine (trade name “DuPont impact tester” manufactured by Tester Sangyo Co., Ltd.).
- a shooting mold (radius of 6.25 mm) was arranged so as to contact the surface of the adherend B on the side to which the adhesive of the adherend B was applied from above through the hole of the adherend A of the laminate.
- weights of 200 mm, 250 mm, and 300 mm from above are dropped from a weight of 300 g and collided with a shooting die to apply a force downward to the adherend B of the laminate in the vertical direction.
- the presence or absence of peeling of the adherend B was visually confirmed.
- a case where the adherend B was not peeled was evaluated as “A”, and a case where the adherend B was peeled was evaluated as “B”.
- the adhesive compositions of Examples 1 to 6 containing a urethane prepolymer containing a polyester polyol, a polyether polyol, and a polybutadiene polyol had high adhesiveness and high impact resistance.
- the adhesive composition of Comparative Example 4 containing a urethane prepolymer not blended was inferior in adhesion and impact resistance.
- the adhesive compositions of Examples 1 to 6 containing an antioxidant had high adhesiveness and high reliability even when stored for 7 days under high temperature and high humidity conditions.
- the adhesive composition of Comparative Example 2 that did not contain an antioxidant had a significantly reduced adhesive property when stored for 7 days under high temperature and high humidity conditions, and the reliability was low.
- the moisture-curable reactive hot melt adhesive compositions obtained in Examples 1 to 6 have a low initial viscosity at 120 ° C., excellent application workability, and excellent adhesion even when the adhesive width is narrow. It can be seen that it has excellent properties and excellent impact resistance.
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Abstract
Description
本明細書において、「~」を用いて示された数値範囲は、「~」の前後に記載される数値をそれぞれ最小値及び最大値として含む範囲を示す。本明細書に段階的に記載されている数値範囲において、ある段階の数値範囲の上限値又は下限値は、他の段階の数値範囲の上限値又は下限値に置き換えてもよい。本明細書に記載されている数値範囲において、その数値範囲の上限値又は下限値は、実施例に示されている値に置き換えてもよい。「A又はB」とは、A及びBのどちらか一方を含んでいればよく、両方とも含んでいてもよい。本明細書に例示する材料は、特に断らない限り、1種を単独で又は2種以上を組み合わせて用いることができる。本明細書において、組成物中の各成分の含有量は、組成物中に各成分に該当する物質が複数存在する場合、特に断らない限り、組成物中に存在する複数の物質の合計量を意味する。
本実施形態の湿気硬化型反応性ホットメルト接着剤組成物(以下、「接着剤組成物」と略す場合もある。)は、ポリエステルポリオール、ポリエーテルポリオール及びポリブタジエンポリオールを含有するポリオール成分とイソシアネート成分との反応物であるイソシアネート基を有するウレタンプレポリマーと、酸化防止剤とを含むことを特徴としている。なお、一般的に、湿気硬化型反応性ホットメルト接着剤組成物とは、空気中の水分又は被着体表面の水分と反応することにより高分子量化し、接着性等を発現するものである。
本実施形態に係るイソシアネート基を有するウレタンプレポリマー(以下、「反応性ウレタンプレポリマー」という場合もある。)は、ポリエステルポリオール、ポリエーテルポリオール及びポリブタジエンポリオールを必須とするポリオール成分を、イソシアネート成分と反応させてなり、ウレタンプレポリマーの末端にイソシアネート基を有している。これにより、湿気硬化後に優れた接着性と優れた耐衝撃性を発揮させることができる。
カラム:「Gelpack GLA130-S」、「Gelpack GLA150-S」及び「Gelpack GLA160-S」(日立化成株式会社製、HPLC用充填カラム)
溶離液:テトラヒドロフラン
流量:1.0mL/min
カラム温度:40℃
検出器:RI
本実施形態に係る接着剤組成物は、上記反応性ウレタンプレポリマーと酸化防止剤とを組み合わせて含むことにより、湿気硬化後に優れた接着性と優れた耐衝撃性とを有すると共に、高い信頼性を有することができる。
本実施形態に係る接着剤組成物には、必要に応じて、熱可塑性ポリマー、粘着付与樹脂、触媒、顔料、紫外線吸収剤、界面活性剤、難燃剤、充填剤等を適量配合してもよい。
本実施形態に係る接着剤組成物は、ポリエステルポリオール、ポリエーテルポリオール及びポリブタジエンポリオールを含有するポリオール成分とイソシアネート成分とを反応させて、イソシアネート基を有するウレタンプレポリマーを得る工程を備える方法により製造される。
ポリエステルポリオールとして、ポリエステルポリオールa(アジピン酸及び1,6-ヘキサンジオールを主成分として得られた結晶性ポリエステルポリオール、水酸基数:2、数平均分子量:5000)、ポリエステルポリオールb(アジピン酸及びエチレングリコールを主成分として得られた結晶性ポリエステルポリオール、水酸基数:2、数平均分子量:2000)、ポリエステルポリオールc(イソフタル酸及びネオペンチルグリコールを主成分として得られた非晶性ポリエステルポリオール、水酸基数:2、数平均分子量:2000)、及び、ポリエステルポリオールd(アゼライン酸及びエチレングリコールを主成分として得られた非晶性ポリエステルポリオール、水酸基数:2、数平均分子量:8000)を準備した。ポリエーテルポリオールとして、ポリプロピレングリコール(水酸基数:2、数平均分子量:2000)を準備した。ポリブタジエンポリオールとして、ポリブタジエンポリオールa(水酸基数:2、数平均分子量:1400、構造単位(I)が占める割合:85%、日本曹達株式会社製、商品名「G-1000」)、及び、ポリブタジエンポリオールb(水酸基数:2、数平均分子量:2800、構造単位(I)が占める割合:20%、出光興産株式会社製、商品名「R-45HT」)を準備した。
イソシアネート成分として、ジフェニルメタンジイソシアネート(イソシアネート基数:2)を準備した。
酸化防止剤として、ヒンダードフェノール系酸化防止剤である、SONGWON製の商品名「SONGNOX1076」を準備した。
予め真空乾燥機により脱水処理した、ポリエステルポリオールa10部、ポリエステルポリオールb45部、ポリエステルポリオールc8部、ポリエステルポリオールd3部、ポリプロピレングリコール24部及びポリブタジエンポリオールa10部と、酸化防止剤0.2部とを加えて均一に混合した後、ジフェニルメタンジイソシアネート24部を更に加えて均一に混合した。次いで、得られた混合物を110℃で1時間反応させ、更に110℃で1時間減圧脱泡攪拌し、イソシアネート基を有するウレタンプレポリマーを含む接着剤組成物を得た。
ポリオール成分として、ポリエステルポリオールa10部、ポリエステルポリオールb40部、ポリエステルポリオールc7部、ポリエステルポリオールd3部、ポリプロピレングリコール20部及びポリブタジエンポリオールb20部を用い、ジフェニルメタンジイソシアネートの配合量を22部に変更した以外は、実施例1と同様にして、接着剤組成物を得た。
ポリオール成分として、ポリエステルポリオールa8部、ポリエステルポリオールb33部、ポリエステルポリオールc6部、ポリエステルポリオールd2部、ポリプロピレングリコール16部及びポリブタジエンポリオールa35部を用い、ジフェニルメタンジイソシアネートの配合量を27部に変更した以外は実施例1と同様にして、接着剤組成物を得た。
ポリオール成分として、ポリエステルポリオールa10部、ポリエステルポリオールb40部、ポリエステルポリオールc7部、ポリエステルポリオールd3部、ポリプロピレングリコール20部及びポリブタジエンポリオールa20部を用い、酸化防止剤の配合量を0.1部に変更した以外は実施例1と同様にして、接着剤組成物を得た。
酸化防止剤の配合量を3部に変更した以外は実施例4と同様にして、接着剤組成物を得た。
酸化防止剤の配合量を5部に変更した以外は実施例4と同様にして、接着剤組成物を得た。
ポリオール成分として、ポリエステルポリオールa13部、ポリエステルポリオールb50部、ポリエステルポリオールc9部、ポリエステルポリオールd3部及びポリプロピレングリコール25部を用い、ジフェニルメタンジイソシアネートの配合量を22部に変更した以外は実施例1と同様にして、接着剤組成物を得た。
酸化防止剤を配合しなかった以外は実施例4と同様にして、接着剤組成物を得た。
ポリオール成分として、ポリプロピレングリコール70部及びポリブタジエンポリオールa30部を用い、ジフェニルメタンジイソシアネートの配合量を28部に変更した以外は実施例1と同様にして、接着剤組成物を得た。
ポリオール成分として、ポリエステルポリオールa13部、ポリエステルポリオールb50部、ポリエステルポリオールc9部、ポリエステルポリオールd3部及びポリブタジエンポリオールb25部を用い、ジフェニルメタンジイソシアネートの配合量を21部に変更した以外は実施例1と同様にして、接着剤組成物を得た。
BH-HH型少量回転粘度計(東機産業株式会社製)を用いて下記条件にて接着剤組成物の溶融粘度を測定した。
ローター :4号ローター
試料量 :15g
ローター回転数:50rpm
温度 :120℃
接着剤組成物を100℃に溶融し、温度23℃、湿度50%の環境下において、縦90mm×横75mm×厚さ2mmのポリカーボネート板上に、縦40mm×横25mm×厚さ100μmの接着剤層を形成した後、当該接着剤層の上に、縦250mm×横25mm×厚さ100μmのポリカーボネートフィルムを圧着して試験片を作製した。温度23℃、湿度50%の環境下において7日間静置した後、90°ピール試験(ピール速度:200mm/分)を行い、接着強度(N/25mm)を測定した。
接着剤組成物を100℃に溶融し、温度23℃、湿度50%の環境下で、縦90mm×横75mm×厚さ2mmのポリカーボネート板上に、縦40mm×横25mm×厚さ100μmの接着剤層を形成した後、当該接着剤層の上に、縦250mm×横25mm×厚さ100μmのポリカーボネートフィルムを圧着して試験片を作製した。試験片を温度23℃、湿度50%の環境下において7日間静置した後、温度85℃、湿度85%の高温高湿条件下に7日間静置した。次いで、90°ピール試験(ピール速度:200mm/分)を行い、接着強度(N/25mm)を測定した。
接着剤組成物を100℃に溶融し、縦15mm×横40mm×厚さ100μmの皮膜形状に成形した試験片を作製し、温度23℃、湿度50%の恒温恒湿槽に7日間放置し、その後、オートグラフAGS-X(株式会社島津製作所製)を用いて、接着剤層の引張弾性率(MPa)、破断強度(MPa)、破断伸び(%)をJIS K-7127に準拠して測定した。
接着剤組成物を100℃に溶融し、内径0.25mmの精密ノズル(武蔵エンジニアリング株式会社製、商品名「SHN-0.25N」)を取り付けたシリンジ容器(武蔵エンジニアリング株式会社製、商品名「PSY-30E」)に入れて、100℃に予め加熱されたディスペンサー(武蔵エンジニアリング株式会社製、商品名「SHOTMASTER 200DS」)を用いて溶融した接着剤組成物を吐出して、被着体A(ポリカーボネート板:幅100mm×長さ50mm×厚さ2mm、中心部に内径20mmの穴)上に穴を囲むように40mm×40mmの正方形を描き、被着体B(アクリル板:幅50mm×長さ50mm×厚さ4mm)を貼り合わせ、接着剤層の幅が0.3mm、厚みが0.1mmになるように調節し、被着体Aと接着剤層と被着体Bとがこの順に積層された積層体を作製した。温度23℃、湿度50%の環境下で3日間放置した後、温度23℃、湿度50%の環境下、積層体の被着体B側が下向きとなるように、積層体の被着体A側をデュポン衝撃機(テスター産業株式会社製、商品名「デュポン衝撃試験機」)に固定した。次いで、撃ち型(半径6.25mm)を、積層体の被着体Aの穴から被着体Bの接着剤を塗布した側の表面に上方から接触させるようにして配置した。
Claims (5)
- ポリエステルポリオール、ポリエーテルポリオール及びポリブタジエンポリオールを含有するポリオール成分とイソシアネート成分との反応物である、イソシアネート基を有するウレタンプレポリマーと、酸化防止剤と、を含む、湿気硬化型反応性ホットメルト接着剤組成物。
- 前記ポリブタジエンポリオールの含有量が、前記ポリオール成分の総量100質量部を基準として5~45質量部である、請求項1又は2に記載の湿気硬化型反応性ホットメルト接着剤組成物。
- 前記イソシアネート基を有するウレタンプレポリマー100質量部に対して、前記酸化防止剤の含有量が0.05~5質量部である、請求項1~3のいずれか一項に記載の湿気硬化型反応性ホットメルト接着剤組成物。
- イソシアネート基を有するウレタンプレポリマーと、酸化防止剤とを含む湿気硬化型反応性ホットメルト接着剤組成物を製造する方法であって、
ポリエステルポリオール、ポリエーテルポリオール及びポリブタジエンポリオールを含有するポリオール成分と、イソシアネート成分とを反応させて、前記イソシアネート基を有するウレタンプレポリマーを得る工程を備える、方法。
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