WO2012124445A1 - ヒートシール剤、それを用いた積層体及び太陽電池モジュール - Google Patents
ヒートシール剤、それを用いた積層体及び太陽電池モジュール Download PDFInfo
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- WO2012124445A1 WO2012124445A1 PCT/JP2012/054359 JP2012054359W WO2012124445A1 WO 2012124445 A1 WO2012124445 A1 WO 2012124445A1 JP 2012054359 W JP2012054359 W JP 2012054359W WO 2012124445 A1 WO2012124445 A1 WO 2012124445A1
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
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- C—CHEMISTRY; METALLURGY
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Definitions
- the present invention relates to a heat sealant that can be used for adhesion of various members, in particular, a polar member and a nonpolar member, for example, adhesion of a back sheet layer of a solar cell module.
- Materials used for manufacturing automobile parts, home appliances, solar power generation devices, etc. have been made of ethylene-vinyl acetate resin, polyolefin resin, etc., which have been excellent in weather resistance, water resistance, etc., and have excellent moldability and recyclability. Members are widely used.
- the ethylene-vinyl acetate resin is generally easily deteriorated by exposure to heat, water (humidity) or the like, and is insufficient in terms of heat and moisture resistance. For this reason, usually, by combining a member made of ethylene-vinyl acetate resin with a glass or polyethylene terephthalate base material to form a composite member, the moisture-heat resistance level at which the deterioration can be suppressed is reduced. In many cases, it is given to the material.
- a substrate made of ethylene-vinyl acetate resin or the like is generally a substrate having a low surface polarity
- an adhesive may be used to bond the ethylene-vinyl acetate resin substrate or the like to the glass or the like. Even if it can be easily peeled off at the interface between the surface of the ethylene-vinyl acetate resin substrate and the adhesive layer or temporarily bonded, the adhesive layer deteriorates due to the influence of heat, water, etc. May cause peeling.
- the composition of the adhesive it is possible to improve the adhesion to nonpolar substrates such as the ethylene-vinyl acetate resin.
- the base material to be bonded is a polar base material such as the glass or polyethylene terephthalate base material
- the adhesion between the polar base material and the adhesive layer is lowered, and also causes peeling over time. was there.
- an adhesive having excellent adhesion for example, an adhesive made of an aqueous dispersion containing an acid-modified polyolefin resin, a polyurethane resin, a fatty acid amide, and a terpene tackifier in a specific ratio in an aqueous medium is known. It is known that such an adhesive is excellent in adhesion to a thermoplastic resin substrate (see, for example, Patent Document 1).
- the adhesive does not have excellent adhesion to both the nonpolar base material and the polar base material as described above, it does not deteriorate at the interface between any base material and the adhesive layer. Sometimes peeled off.
- the adhesive since the adhesive is easily deteriorated by exposure to heat, water (humidity), etc., the adhesive layer is deteriorated or peeled over time due to the influence of heat, water, etc. In some cases, the material itself may deteriorate.
- the adhesive is usually applied to the surface of one of the substrates immediately before the bonding, and then the adhesive layer is completely formed.
- the other base material is laminated on the surface of the adhesive layer having a tackiness before being cured, and then bonded together by curing.
- this method requires the production of the composite member because it is necessary to perform an operation such as applying an adhesive or removing a solvent contained in the adhesive at a work site where the substrates are bonded together. In some cases, the efficiency was significantly reduced.
- the problem to be solved by the present invention has, for example, excellent adhesion to both the polar substrate and the nonpolar substrate, and due to the influence of heat, water (humidity), etc. It is an object of the present invention to provide a heat sealant capable of forming a heat seal layer having a moisture and heat resistance level that does not cause a decrease in adhesion.
- the problem to be solved by the present invention has, for example, excellent adhesion to both the polar substrate and the nonpolar substrate, and due to the influence of heat, water (humidity), etc.
- a heat-sealed layer having a heat-and-moisture resistance level that does not cause deterioration or lowering of adhesion can be formed, and heat is crosslinked by applying the heat-sealing agent in advance on one substrate surface and drying it. After forming a sealing layer, it is providing the heat sealing agent which can adhere
- the present inventors have studied to solve the above-mentioned problems, the present inventors have studied based on a resin composition in which an aqueous urethane resin (A) and an aqueous polyolefin resin (B) are combined, and can be used in combination with the resin composition.
- a resin composition in which an aqueous urethane resin (A) and an aqueous polyolefin resin (B) are combined, and can be used in combination with the resin composition.
- Various combinations with different types of cross-linking agents were studied.
- the present invention is a heat sealant containing an aqueous urethane resin (A), an aqueous polyolefin resin (B), a crosslinking agent (C) and an aqueous medium (D), wherein the crosslinking agent (C) is alkylated. It contains a methylol melamine resin (c1) and an epoxy compound (c2), and the alkylated methylol melamine resin (c1) is 5 with respect to the total mass of the aqueous urethane resin (A) and the aqueous polyolefin resin (B).
- the aqueous urethane resin (A) and the aqueous polyolefin resin (B) are contained in the range of 50% by mass to 50% by mass, and either or both of them have a functional group [X] capable of reacting with an epoxy group, and
- the ratio of the amount of the epoxy group contained in the epoxy compound (c2) to the total amount of the functional group [X] [the amount of the epoxy group / the total amount of the functional group [X] It relates heat-sealing material, wherein the mass] is 5 / 1-1 / 5.
- the heat sealant of the present invention has excellent adhesion to not only ethylene-vinyl acetate resins and polyolefin resins widely used in the industry, but also to substrates made of polyethylene terephthalate, etc. It can be used for pasting various nonpolar substrates and polar substrates, and covering the surfaces of these substrates.
- the heat sealant of the present invention can remarkably improve the production efficiency of a laminate (composite member) obtained by laminating various substrates, particularly a solar cell module.
- the heat sealing agent of the present invention is a heat sealing agent containing an aqueous urethane resin (A), an aqueous polyolefin resin (B), a crosslinking agent (C) and an aqueous medium (D), wherein the crosslinking agent (C) is It contains an alkylated methylol melamine resin (c1) and an epoxy compound (c2), and the alkylated methylol melamine resin (c1) is based on the total mass of the aqueous urethane resin (A) and the aqueous polyolefin resin (B).
- the water-based urethane resin (A) and the water-based polyolefin resin (B) or both have a functional group [X] capable of reacting with an epoxy group.
- the total amount of material] is in a range of 5 / 1-1 / 5.
- the alkylated methylol melamine resin (c1) can form a crosslinked structure by a self-crosslinking reaction.
- a functional group such as a hydroxyl group is generated when the functional group [X] of the aqueous urethane resin (A) and the aqueous polyolefin resin (B) reacts with the epoxy compound (c2).
- the hydroxyl group and the alkylated methylol melamine resin (c1) react to form a crosslinked structure.
- the alkylated methylol melamine resin (c1) is used in the range of 5% by mass to 50% by mass with respect to the total mass of the aqueous urethane resin (A) and the aqueous polyolefin resin (B). This makes it possible to achieve both excellent heat and moisture resistance that does not cause deterioration of the heat-seal layer and decrease in adhesive strength regardless of heat, water (humidity), etc., and excellent adhesion to various substrates. Is possible.
- the amount of the alkylated methylol melamine resin (c1) used is, for example, 3% by mass with respect to the total mass of the aqueous urethane resin (A) and the aqueous polyolefin resin (B), the moisture resistance When the amount of use is 55% by mass, it may cause a decrease in wet heat resistance and a decrease in adhesion to various substrates.
- the alkylated methylol melamine resin (c1) is used in an amount of 10 to 30% by mass based on the total mass of the aqueous urethane resin (A) and the aqueous polyolefin resin (B). It is preferable in order to achieve both excellent moisture and heat resistance and excellent adhesion to various substrates.
- the epoxy compound (c2) reacts with the functional group [X] of either one or both of the aqueous urethane resin (A) and the aqueous polyolefin resin (B) to form a crosslinked structure.
- the present invention cannot solve the problems of the present invention as long as the alkylated methylol melamine resin (c1) is used as the crosslinking agent (C). Even if the alkylated methylol melamine resin (c1) is used alone as the crosslinking agent (C), it may be difficult to achieve both excellent heat and moisture resistance and excellent adhesion to various substrates.
- the epoxy compound (c2) is based on the epoxy compound (in terms of the number of moles) of the functional group [X] of the aqueous urethane resin (A) and the aqueous polyolefin resin (B).
- the proportion of the epoxy group substance amount (mole number) of c2) [epoxy group substance amount (mole number) / functional group [X] total substance amount (mole number)] is 5/1 to 1/5. Use with a range.
- the usage ratio of the epoxy compound (c2) [the amount of the epoxy group substance / the total amount of the functional group [X]] is 6/1, the adhesion to various substrates may be reduced. In the case where the use ratio is 1/6, the durability such as heat and humidity resistance may be lowered.
- the use ratio [the amount of the epoxy group substance / the total amount of the functional group [X]] is preferably in the range of 2/1 to 1/3. It is preferable in order to achieve both good adhesion.
- alkylated methylol melamine resin (c1) and the epoxy compound (c2) have a mass ratio [the alkylated methylol described above, in order to achieve both excellent heat and heat resistance and excellent adhesion to various substrates.
- Melamine resin (c1) / epoxy compound (c2)] is preferably used in the range of 7/1 to 1/4, and more preferably in the range of 5/1 to 1/4.
- the aqueous urethane resin (A) and the aqueous polyolefin resin (B) used in combination with the crosslinking agent (C) react with a functional group of the epoxy compound (c2) among the crosslinking agent (C).
- the functional group of the epoxy compound (c2) is specifically an epoxy group, a hydrolyzable silyl group such as an alkoxysilyl group or a silanol group.
- Examples of the functional group [X] include a carboxyl group, a hydroxyl group, and an amino group, and among them, a carboxyl group is preferable.
- the urethane resin and the said water-based polyolefin resin (B) which have hydrophilic groups, such as an anionic group and a cationic group,
- hydrophilic groups such as an anionic group and a cationic group
- a resin a carboxyl group or a carboxylate group as the hydrophilic group acts as the functional group [X] during the crosslinking reaction, and a part of the crosslinking agent (C).
- the aqueous urethane resin (A) preferably has an acid value of 10 to 70, and has an acid value of 10 to 50. It is more preferable to use those having an acid value of 10 to 35 in order to improve adhesion to various substrates.
- the aqueous polyolefin resin (B) preferably has an acid value of 5 to 300, and more preferably has an acid value of 10 to 250.
- the aqueous urethane resin (A) and the aqueous polyolefin resin (B) are preferably dispersed or dissolved independently in the aqueous medium (D), but a part of them binds to form resin particles.
- so-called core-shell type composite resin particles may be formed.
- the said water-based urethane resin (A) and the said water-based polyolefin resin (B) form a resin particle each independently, and can disperse
- the resin particles preferably have an average particle diameter in the range of about 10 nm to 500 nm in order to improve the smoothness of the coat film that can be formed.
- the average particle diameter here refers to the average particle diameter on a volume basis measured by a dynamic light scattering method.
- the mass ratio [aqueous urethane resin (A) / aqueous polyolefin resin (B)] between the aqueous urethane resin (A) and the aqueous polyolefin resin (B) is preferably in the range of 9/1 to 2/8.
- the range of 8/2 to 3/7 is more preferable, and the range of 8/2 to 5/5 achieves both excellent heat and humidity resistance and excellent adhesion to various substrates. Furthermore, it is more preferable.
- the water-based urethane resin (A) and the water-based polyolefin resin (B) are contained in the range of 5% by mass to 70% by mass with respect to the total amount of the heat sealant of the present invention. It is preferable for maintaining stable dispersion stability and coating workability.
- the aqueous urethane resin (A) and the aqueous polyolefin resin (B) may have a hydrophilic group from the viewpoint of imparting good dispersion stability in the aqueous medium (D).
- a hydrophilic group for example, an anionic group, a cationic group, and a nonionic group can be used, and it is more preferable to use an anionic group.
- anionic group for example, a carboxyl group, a carboxylate group, a sulfonic acid group, a sulfonate group and the like can be used.
- a carboxylate group partially or wholly neutralized with a basic compound or the like It is preferable to use a sulfonate group for producing an aqueous resin having good water dispersibility.
- a tertiary amino group or a neutralized group thereof using an acid compound or a quaternizing agent can be used.
- nonionic group examples include polyoxyalkylene groups such as polyoxyethylene group, polyoxypropylene group, polyoxybutylene group, poly (oxyethylene-oxypropylene) group, and polyoxyethylene-polyoxypropylene group. Can be used.
- the water-based urethane resin (A) has the functional group [X], and is a heat sealant that can form a heat seal layer that has both excellent heat and moisture resistance and excellent adhesion to various substrates. Use to get.
- the aqueous urethane resin (A) has a weight average molecular weight in the range of 5,000 to 200,000 from the viewpoint of imparting excellent adhesion and durability to polar and nonpolar substrates. It is preferable to use one having a range of 5,000 to 100,000.
- an aromatic ring structure is 200 mmol with respect to the whole aqueous
- / Kg to 9,000 mmol / kg is preferably used, and more preferably 350 mmol / kg to 8,000 mmol / kg.
- water-based urethane resin (A) for example, a product produced by reacting a polyol (a1), a polyisocyanate (a2), and a chain extender as necessary can be used.
- polyester polyol for example, polyester polyol, polycarbonate polyol, polyether polyol, polyolefin polyol and the like can be used alone or in combination of two or more.
- polyester polyols and polycarbonate polyols are preferably used, and aromatic structure-containing polyester polyols and polycarbonate polyols are more preferably used.
- the aromatic structure-containing polyester polyol is preferably used, for example, when it is desired to enhance the adhesion to a polar substrate having a high surface polarity of polyethylene terephthalate.
- the polycarbonate polyol is preferably used for imparting a level of durability that can prevent deterioration of the polyethylene terephthalate substrate and the like.
- polyester polyol examples include those obtained by an esterification reaction of a low molecular weight polyol and a polycarboxylic acid, polyesters obtained by a ring-opening polymerization reaction of a cyclic ester compound such as ⁇ -caprolactone, and copolymers thereof. Polymerized polyester or the like can be used.
- low molecular weight polyol examples include ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, neopentyl glycol, and 1,3-butane having a molecular weight of about 50 to 300.
- Aliphatic polyols such as diols, aliphatic cyclic structure-containing polyols such as cyclohexanedimethanol, bisphenol compounds such as bisphenol A and bisphenol F, and aromatic structure-containing polyols such as alkylene oxide adducts thereof can be used. .
- polycarboxylic acid examples include aliphatic polycarboxylic acids such as succinic acid, adipic acid, sebacic acid, and dodecanedicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, and naphthalene.
- Aromatic polycarboxylic acids such as dicarboxylic acids, and anhydrides or ester-forming derivatives thereof can be used.
- An aromatic structure-containing polyester polyol that can be used as the polyester polyol is produced by using, for example, a combination of the low molecular weight polyol and the polycarboxylic acid that has an aromatic structure in one or both of them. Can do.
- the aromatic structure-containing polyester polyol includes an aliphatic polyol such as ethylene glycol, diethylene glycol, and 1,4-butanediol, and an aromatic polycarboxylic acid such as terephthalic acid, isophthalic acid, and phthalic acid. It is preferable to use what is obtained by combining reaction. It can also be produced by reacting an aromatic structure-containing polyol such as bisphenol A with the aliphatic polycarboxylic acid.
- the aromatic structure-containing polyester polyol is an aromatic ring in the range of 300 mmol / Kg to 10,000 mmol / Kg with respect to the total amount of the aromatic structure-containing polyester polyol, particularly from the viewpoint of improving adhesion to a polar substrate. It is preferable to use a material having a structure in order to improve adhesion to a polar substrate having a high surface polarity such as a polyethylene terephthalate substrate without impairing excellent heat and heat resistance.
- the polyester polyol preferably has a number average molecular weight in the range of 200 to 5,000.
- the aromatic structure-containing polyester polyol has a molecular weight of 250 to 3,000 in order to improve adhesion to a polar substrate having a high surface polarity such as a polyethylene terephthalate substrate without impairing excellent moisture and heat resistance. It is preferable to use one having a number average molecular weight.
- the polyester polyol preferably the aromatic structure-containing polyester polyol is 10% by mass with respect to the total mass of the polyol (a1) and polyisocyanate (a2) used in the production of the aqueous urethane resin (A) used in the present invention.
- Use in the range of ⁇ 90% by mass is preferable in terms of improving the adhesion to polar substrates having a high surface polarity such as a polyethylene terephthalate substrate without impairing the excellent heat and moisture resistance.
- polycarbonate polyol which can be used for the said polyol (a1)
- carbonate ester and a polyol react for example, what is obtained by making phosgene, bisphenol A, etc. react can be used.
- carbonate ester methyl carbonate, dimethyl carbonate, ethyl carbonate, diethyl carbonate, cyclocarbonate, diphenyl carbonate, or the like can be used.
- polyol that can react with the carbonate ester examples include ethylene glycol, diethylene glycol, 1,2-propylene glycol, dipropylene glycol, 1,4-butanediol, 1,5-pentanediol, and 3-methyl-1,5. -Pentanediol, 1,4-cyclohexanediol, 1,6-hexanediol, cyclohexanedimethanol and other relatively low molecular weight diols having a molecular weight of 50 to 2,000, polyethylene glycol, polypropylene glycol, and polyhexamethylene Polyester polyols such as adipate can be used.
- polycarbonate polyol obtained by reacting 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol alone or in combination with two or more carbonates with ethylene-acetic acid. It is preferable for providing adhesion to a nonpolar substrate made of vinyl resin or polypropylene.
- the polycarbonate polyol having a number average molecular weight in the range of 500 to 4,000 can be used for a nonpolar substrate made of ethylene-vinyl acetate resin, polypropylene, or the like without impairing excellent heat and heat resistance. It is preferable when providing adhesiveness.
- the polycarbonate polyol is used in the range of 10% by mass to 90% by mass with respect to the total mass of the polyol (a1) and the polyisocyanate (a2) used in the production of the aqueous urethane resin (A) of the present invention. It is preferable for imparting adhesion to a nonpolar substrate made of ethylene-vinyl acetate resin, polypropylene, or the like without impairing excellent moisture and heat resistance.
- polyether polyol which can be used for the said polyol (a1)
- the thing which carried out the addition polymerization of the alkylene oxide, for example by using 1 type, or 2 or more types of the compound which has 2 or more of active hydrogen atoms as an initiator is used. can do.
- the initiator examples include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, trimethylene glycol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, bisphenol A, glycerin, and triglyceride. Methylolethane, trimethylolpropane and the like can be used.
- alkylene oxide for example, ethylene oxide, propylene oxide, butylene oxide, styrene oxide, epichlorohydrin, tetrahydrofuran and the like can be used.
- polystyrene polyol for example, polyethylene polyol, polypropylene polyol, polyisobutene polyol, hydrogenated (hydrogenated) polybutadiene polyol, and hydrogenated (hydrogenated) polyisoprene polyol are used. Can do.
- a hydrophilic group-containing polyol can be used in combination with the above-described one.
- hydrophilic group-containing polyol for example, anionic group-containing polyols other than the above-described polyols, cationic group-containing polyols, and nonionic group-containing polyols can be used. Especially, it is preferable to use an anionic group containing polyol or a cationic group containing polyol, and it is more preferable to use an anionic group containing polyol.
- anionic group-containing polyol for example, a carboxyl group-containing polyol or a sulfonic acid group-containing polyol can be used.
- carboxyl group-containing polyol examples include 2,2′-dimethylolpropionic acid, 2,2′-dimethylolbutanoic acid, 2,2′-dimethylolbutyric acid, 2,2′-dimethylolvaleric acid, and the like. Among them, it is preferable to use 2,2′-dimethylolpropionic acid.
- carboxyl group-containing polyester polyol obtained by making the said carboxyl group-containing polyol and various polycarboxylic acids react can also be used.
- sulfonic acid group-containing polyol examples include dicarboxylic acids such as 5-sulfoisophthalic acid, sulfoterephthalic acid, 4-sulfophthalic acid, and 5 [4-sulfophenoxy] isophthalic acid, and salts thereof, and the aromatic structure-containing polyester.
- dicarboxylic acids such as 5-sulfoisophthalic acid, sulfoterephthalic acid, 4-sulfophthalic acid, and 5 [4-sulfophenoxy] isophthalic acid, and salts thereof
- aromatic structure-containing polyester examples include dicarboxylic acids such as 5-sulfoisophthalic acid, sulfoterephthalic acid, 4-sulfophthalic acid, and 5 [4-sulfophenoxy] isophthalic acid, and salts thereof, and the aromatic structure-containing polyester.
- the carboxyl group-containing polyol or sulfonic acid group-containing polyol is preferably used in the range where the acid value of the urethane resin (C) is 10 to 70, more preferably in the range of 10 to 50, More preferably, it is used in the range of 10 to 35.
- the acid value said by this invention is the theoretical value computed based on the usage-amount of acid group containing compounds, such as a carboxyl group containing polyol used for manufacture of the said urethane resin (C).
- the anionic group is preferably partially or completely neutralized with a basic compound or the like in order to develop good water dispersibility.
- Examples of basic compounds that can be used for neutralizing the anionic group include organic amines having a boiling point of 200 ° C. or higher, such as ammonia, triethylamine, morpholine, monoethanolamine, and diethylethanolamine, NaOH, KOH, and LiOH.
- a metal hydroxide containing etc. can be used.
- a tertiary amino group-containing polyol for example, a tertiary amino group-containing polyol can be used. Specifically, N-methyl-diethanolamine, a compound having two epoxies per molecule, and a secondary amine can be used. A polyol obtained by reacting with can be used.
- the cationic group is preferably partially or completely neutralized with an acidic compound such as formic acid, acetic acid, propionic acid, succinic acid, glutaric acid, tartaric acid, and adipic acid.
- an acidic compound such as formic acid, acetic acid, propionic acid, succinic acid, glutaric acid, tartaric acid, and adipic acid.
- the tertiary amino group as the cationic group is preferably partly or entirely quaternized.
- the quaternizing agent for example, dimethyl sulfate, diethyl sulfate, methyl chloride, ethyl chloride and the like can be used, and dimethyl sulfate is preferably used.
- nonionic group-containing polyol polyalkylene glycol having a structural unit derived from ethylene oxide can be used.
- the hydrophilic group-containing polyol is preferably used in the range of 0.3% by mass to 10.0% by mass with respect to the total amount of the polyol (a1) used in the production of the aqueous urethane resin (A).
- polyol (a1) in addition to the above-described polyol, other polyols can be used as necessary.
- Examples of the other polyol include ethylene glycol, diethylene glycol, 1,2-propylene glycol, dipropylene glycol, 1,4-butanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, Polyol having a relatively low molecular weight such as 1,4-cyclohexanediol, 1,6-hexanediol, cyclohexanedimethanol, etc. can be used.
- polyisocyanate (a2) that can react with the polyol (a1) examples include 4,4′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, crude diphenylmethane diisocyanate, phenylene diisocyanate, tolylene diisocyanate, Contains aromatic polyisocyanates such as naphthalene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, lysine diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, cycloaliphatic diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate, etc. Polyisocyanate It can be used.
- the aqueous urethane resin (A) is prepared by reacting the polyol (a1) with the polyisocyanate (a2) in the absence of a solvent or in the presence of an organic solvent, and then the urethane.
- a hydrophilic group in the resin, a neutralized part or all of the hydrophilic group as necessary is mixed with the aqueous medium (D) to make it aqueous. It can be produced by mixing and reacting with a chain extender.
- the equivalent ratio of the isocyanate group of the polyisocyanate (a2) to the hydroxyl group of the polyol (a1) is 0.8 to 2.5.
- it is carried out in the range of 0.9 to 1.5.
- Examples of the organic solvent that can be used for producing the aqueous urethane resin (A) include ketones such as acetone and methyl ethyl ketone; ethers such as tetrahydrofuran and dioxane; acetates such as ethyl acetate and butyl acetate; Nitriles such as acetonitrile; amides such as dimethylformamide and N-methylpyrrolidone can be used alone or in combination of two or more.
- a chain extender is added for the purpose of further improving the adhesion of the heat-sealing agent of the present invention to a polar substrate and a nonpolar substrate. May be used.
- chain extender that can be used when the aqueous urethane resin (A) is produced, polyamine, other active hydrogen atom-containing compounds, and the like can be used.
- polyamine examples include ethylenediamine, 1,2-propanediamine, 1,6-hexamethylenediamine, piperazine, 2,5-dimethylpiperazine, isophoronediamine, 4,4'-dicyclohexylmethanediamine, 3,3'- Diamines such as dimethyl-4,4′-dicyclohexylmethanediamine, 1,4-cyclohexanediamine; N-hydroxymethylaminoethylamine, N-hydroxyethylaminoethylamine, N-hydroxypropylaminopropylamine, N-ethylaminoethylamine, N-methylaminopropylamine; diethylenetriamine, dipropylenetriamine, triethylenetetramine; hydrazine, N, N′-dimethylhydrazine, 1,6-hexamethylenebishydrazine; disuccinate Dorazide, adipic acid dihydrazide, glutaric acid dihydrazide, sebacic acid
- Examples of the other active hydrogen-containing compounds include ethylene glycol, diethylene recall, triethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, hexamethylene glycol, and saccharose.
- Glycols such as methylene glycol, glycerin and sorbitol; phenols such as bisphenol A, 4,4′-dihydroxydiphenyl, 4,4′-dihydroxydiphenyl ether, 4,4′-dihydroxydiphenylsulfone, hydrogenated bisphenol A, hydroquinone , And water can be used alone or in combination of two or more thereof within a range in which the storage stability of the coating agent of the present invention is not lowered.
- the chain extender is preferably used, for example, in a range where the equivalent ratio of the amino group and excess isocyanate group of the polyamine is 1.9 or less (equivalent ratio), 0.3 to 1.0 (equivalent It is more preferable to use it in the range of the ratio.
- aqueous urethane resin (A) produced by the above method can be made aqueous, for example, by the following method.
- Method 1 After neutralizing or quaternizing some or all of the hydrophilic groups of the aqueous urethane resin obtained by reacting the polyol (a1) with the polyisocyanate (a2), A method in which the aqueous urethane resin (A) is dispersed in water by dispersing and then chain-extending using the chain extender.
- Aqueous urethane resin obtained by reacting polyol (a1) and polyisocyanate (a2) and a chain extender similar to the above are charged in a reaction vessel in a batch or divided, and chain extension is performed.
- a water-based urethane resin (A) is produced by reacting, and then neutralizing or quaternizing some or all of the hydrophilic groups in the obtained water-based urethane resin (A). How to let them
- an emulsifier may be used as necessary.
- a machine such as a homogenizer may be used as necessary.
- emulsifier examples include nonionic emulsifiers such as polyoxyethylene nonylphenyl ether, polyoxyethylene lauryl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene sorbitol tetraoleate, and polyoxyethylene / polyoxypropylene copolymer.
- nonionic emulsifiers such as polyoxyethylene nonylphenyl ether, polyoxyethylene lauryl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene sorbitol tetraoleate, and polyoxyethylene / polyoxypropylene copolymer.
- Fatty acid salts such as sodium oleate, alkyl sulfates, alkylbenzene sulfonates, alkyl sulfosuccinates, naphthalene sulfonates, polyoxyethylene alkyl sulfates, alkane sulfonate sodium salts, sodium alkyl diphenyl ether sulfonates, etc.
- Anionic emulsifiers; cationic amines such as alkylamine salts, alkyltrimethylammonium salts, alkyldimethylbenzylammonium salts It is below.
- an anionic or nonionic emulsifier it is basically preferable to use an anionic or nonionic emulsifier.
- a heat sealant that improves the ease of production of the heat sealant of the present invention and that has both excellent heat and moisture resistance and excellent adhesion to various substrates. It is preferable when preparing.
- the aqueous urethane resin (A) aqueous dispersion may be a mixture of two or more aqueous urethane resins having different compositions. Specifically, two or more aqueous urethane resins having different compositions of the polyol (a1) used for the production of the aqueous urethane resin can be used in combination.
- aqueous polyolefin resin (B) used in the present invention examples include homopolymers and copolymers such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene and 1-nonene. Of these, those having a functional group [X] can be used. Specifically, polyethylene, polypropylene, polybutadiene, ethylene-propylene copolymer, natural rubber, synthetic isopropylene rubber, ethylene-vinyl acetate copolymer Among them, it is essential to use those having a functional group [X] capable of reacting with the epoxy group or isocyanate group of the crosslinking agent (C). When the aqueous polyolefin resin (B) is a copolymer, it may be a random copolymer or a block copolymer.
- Examples of the functional group [X] of the aqueous polyolefin resin (B) include a carboxyl group and the like, as in the functional group [X] of the aqueous urethane resin (A). preferable.
- the functional group [X] may be the same functional group as the hydrophilic group of the aqueous polyolefin resin (B). Specifically, when a carboxyl group or a carboxylate group which is an anionic group is used as the hydrophilic group, the carboxyl group or the like may act as the functional group [X] during the crosslinking reaction.
- aqueous polyolefin resin (B) having a carboxyl group as the functional group [X] examples include those obtained by reacting the polyolefin resin exemplified above with an unsaturated carboxylic acid, and reacting with a vinyl monomer. It is preferable to use so-called modified polyolefin resins such as those obtained or chlorinated.
- a carboxyl group as the functional group [X] can be introduced into the aqueous polyolefin resin (B) by reacting the polyolefin resin with an unsaturated dicarboxylic acid such as (anhydrous) maleic acid.
- Examples of the unsaturated dicarboxylic acid include maleic acid, fumaric acid, itaconic acid, citraconic acid, and anhydrides thereof, and unsaturated dicarboxylic acid esters (butyl maleate, dibutyl maleate, butyl itaconate, etc.). One or more of these can be used. Of these, maleic anhydride is preferred.
- the aqueous polyolefin resin (B) modified with the unsaturated carboxylic acid has an acid value in the range of 5 to 250 to prevent deterioration of the cured resin layer due to the influence of heat, water (humidity), etc. And it is preferable when preventing the fall of the adhesiveness with respect to various base materials.
- the modification of the polyolefin resin can be performed, for example, by reacting the polyolefin resin as described above with an unsaturated dicarboxylic acid such as maleic acid or the like.
- the water-based polyolefin resin (B) can be used to prevent deterioration of the cured resin layer due to the influence of heat, water (humidity), etc., and to prevent a decrease in adhesion to various substrates. It is preferable to use those having a weight average molecular weight of 000. In addition, the said weight average molecular weight points out the value measured using gel permeation chromatography (GPC).
- the crosslinking agent (C) used in the present invention will be described.
- the crosslinking agent (C) the alkylated methylol melamine resin (c1) is used as an essential component, and the epoxy compound (c2) is used in combination with the alkylated methylol melamine resin (c1). It is important to obtain a heat sealing agent that achieves both excellent heat and moisture resistance and excellent adhesion to various substrates.
- alkylated methylol melamine resin (c1) for example, a product obtained by reacting a methylolated melamine resin with a lower alcohol (an alcohol having 1 to 6 carbon atoms) such as methyl alcohol or butyl alcohol is used. Can do. Specifically, an imino group-containing alkylated methylol melamine resin, an amino group-containing alkylated methylol melamine resin, or the like can be used.
- methylolated melamine resin for example, amino group-containing methylol-type melamine resin obtained by condensing melamine and formaldehyde, imino group-containing methylol-type melamine resin, trimethoxymethylol-type melamine resin, hexamethoxymethylol-type melamine resin, etc. are used. It is preferable to use a trimethoxymethylol type melamine resin or a hexamethoxymethylol type melamine resin.
- epoxy compound (c2) those having 2 to 5 epoxy groups, more preferably 3 to 4 epoxy groups can be used.
- Examples of the epoxy compound (c2) include bisphenol A epichlorohydrin type epoxy resin, ethylene glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,6-hexanediol glycidyl ether, trimethylol.
- the epoxy compound (c2) preferably has an epoxy equivalent of 100 to 300 for imparting durability.
- the epoxy compound (c2) preferably has an epoxy equivalent of 100 to 300 for imparting durability.
- trimethylolpropane triglycidyl ether or glycerin triglycidyl ether is used. It is preferable to use it.
- epoxy compound (c2) use of an epoxy compound having a hydrolyzable silyl group prevents deterioration of the cured resin layer due to the influence of heat, water (humidity), etc., and adheres to various substrates. From the viewpoint of preventing the deterioration of the property.
- Examples of the epoxy compound having a hydrolyzable silyl group include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 3-glycidoxy.
- Propylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, and the like can be used.
- the hydrolyzable silyl group-containing epoxy compound (c2) As the hydrolyzable silyl group-containing epoxy compound (c2), the deterioration of the cured resin layer due to the influence of heat, water (humidity) or the like is prevented, and the deterioration of the adhesion to various substrates is prevented.
- crosslinking agent (C) in addition to the alkylated methylol melamine resin (c1) and the hydrolyzable silyl group-containing epoxy compound (c2), other crosslinking agents may be used in combination, if necessary.
- isocyanate monomers such as tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, and dihydric alcohol compounds such as trimethylolpropane.
- Isocyanate compounds or isocyanurates obtained by addition reaction and isocyanate compounds such as burette type compounds can be used as necessary.
- aqueous medium (D) used in the present invention examples include water, an organic solvent miscible with water, and a mixture thereof.
- the organic solvent miscible with water include alcohols such as methanol, ethanol, n- and isopropanol; ketones such as acetone and methyl ethyl ketone; polyalkylene glycols such as ethylene glycol, diethylene glycol and propylene glycol; Alkyl ethers; lactams such as N-methyl-2-pyrrolidone, and the like.
- only water may be used, a mixture of water and an organic solvent miscible with water may be used, or only an organic solvent miscible with water may be used.
- water alone or a mixture of water and an organic solvent miscible with water is preferable, and only water is particularly preferable.
- the aqueous medium (D) is contained in the range of 30% by mass to 90% by mass with respect to the total amount of the heat sealant of the present invention, which improves the workability of the heat sealant of the present invention. , It is preferable for achieving both adhesion and heat-and-moisture resistance.
- the heat sealing agent of the present invention is, for example, a batch of an aqueous dispersion of the aqueous urethane resin (A) obtained by the above method, an aqueous dispersion of the aqueous polyolefin resin (B), and the crosslinking agent (C). Or it can manufacture by dividing
- the crosslinking agent (C) the alkylated methylol melamine resin (c1) and the hydrolyzable silyl group-containing epoxy compound (c2) may be mixed in advance, and these are separately separated into the aqueous urethane resin (A). Or an aqueous dispersion of the aqueous polyolefin resin (B).
- the heat sealing agent of the present invention obtained by the above method may contain other additives as required in addition to the above-described components.
- the additive examples include an antioxidant, a light-resistant agent, a plasticizer, a film-forming aid, a leveling agent, a foaming agent, a thickener, a colorant, a flame retardant, other aqueous resins, and various fillers. It can be used within a range that does not impair the effect.
- a surfactant can be used from the viewpoint of further improving the dispersion stability of the heat sealant of the present invention.
- the surfactant may reduce the adhesion and water resistance of the resulting coating, 20 parts by mass with respect to a total of 100 parts by mass of the aqueous urethane resin (A) and the aqueous polyolefin resin (B). It is preferable to use in the following ranges, and it is preferable not to use as much as possible.
- the heat sealant of the present invention can form a heat seal layer having excellent adhesion to a substrate and excellent heat and moisture resistance.
- the heat sealant of the present invention since it has excellent adhesion to both polar and nonpolar substrates, it can be used as a heat sealant for bonding polar and nonpolar substrates. It can be preferably used.
- a non-polar base material composed of polypropylene resin, polyvinyl butyral, glass or the like and a heat sealant for adhesion between a backsheet layer (polar base material) made of polyethylene terephthalate, polypropylene, or the like.
- Nonpolar substrates include, for example, substrates composed of ethylene-vinyl acetate copolymer, polyvinylidene fluoride resin, polyvinyl fluoride resin, ethylene-vinyl alcohol copolymer, polypropylene resin, polyvinyl butyral, glass, etc. Is mentioned.
- the heat sealing agent of the present invention can be applied to the surface of one substrate and dried by placing the other substrate on the surface of the resin layer that has been crosslinked to some extent and then heating, thereby causing the crosslinking reaction. It can be used when the produced hydroxyl group reacts with the hydrolyzable silyl group of the hydrolyzable silyl group-containing epoxy compound (c2) to bond the two substrates together. Since the surface of the resin layer formed by applying and drying on the surface of one of the substrates has almost no tackiness before the heating, the resin layer is previously provided on the surface of one of the substrates. It is also possible to store the stacked members in a stacked state.
- Examples of the method for applying the heat sealant of the present invention to the substrate surface include a spray method, a curtain coater method, a flow coater method, a roll coater method, a brush coating method, and a dipping method.
- the heat sealant or the like when applied to the surface of a plastic film such as a polyethylene terephthalate film, the heat is applied to the film surface in the course of biaxial stretching of the plastic substrate at about 200 ° C.
- An in-line coating method can be employed in which a heat seal layer is formed by applying and drying a sealant, causing a crosslinking reaction, and then stretching the film in the transverse direction.
- the plastic film obtained by the biaxial stretching is once wound around a roll or the like, and then from the roll.
- An off-line coating method in which a plastic film is drawn and the heat sealant or the like is applied to the surface of the plastic film can be employed.
- the heat sealant or the like When applying the heat sealant or the like to the surface of the plastic film by the off-line coating method, it is preferable to perform drying at a temperature of approximately 150 ° C. or lower so as not to impair the dimensional stability of the plastic film.
- the heat seal layer formed by crosslinking and curing the heat sealant on the surface of the substrate can be formed.
- the heat sealing agent of the present invention when applied to one substrate surface as described above, and the heat sealing layer formed by crosslinking and curing the heat sealing agent on the substrate surface is provided, By placing another base material on the surface of the heat seal layer and then heating to approximately 100 ° C. to 160 ° C. in a reduced pressure or pressurized state, a laminated body thereof can be obtained. it can.
- the laminate Since the laminate is excellent in heat and humidity resistance, it can be used for various purposes including, for example, the production of solar cell modules (solar power generation devices) and the fixing of automobile interior materials.
- ethylene-vinyl acetate copolymer, polyvinylidene fluoride resin, polyvinyl fluoride resin, ethylene-vinyl alcohol copolymer, polypropylene resin, which constitutes the opposite side (surface) to the light-receiving surface constituting the solar cell It can be suitably used for adhesion between a nonpolar substrate made of polyvinyl butyral, glass or the like and a backsheet layer (nonpolar substrate) made of polyethylene terephthalate or polypropylene or the like.
- the solar cell module is generally intended to prevent deterioration on the surface of a base material made of an ethylene-vinyl acetate copolymer or the like constituting the surface opposite to the light receiving surface constituting the solar cell.
- a back sheet layer made of polyethylene terephthalate or polypropylene is provided. They are formed, for example, by curing the heat-sealing agent of the present invention on the substrate surface made of the ethylene-vinyl acetate copolymer constituting the surface opposite to the light receiving surface constituting the solar cell. It can be produced by providing a heat seal layer and then laminating a back sheet layer made of polyethylene terephthalate or polypropylene on the heat seal layer.
- a laminated sheet having a heat seal layer formed by curing the heat seal agent on a sheet surface made of polyethylene terephthalate or polypropylene or the like that can form the back sheet layer is prepared, and a solar cell.
- the heat seal layer of the laminated sheet and the substrate surface made of the ethylene-vinyl acetate copolymer are in contact with the substrate surface made of the ethylene-vinyl acetate copolymer on the opposite side to the light receiving surface constituting They can be stacked and stacked by heating.
- the solar cell module obtained by such a method is excellent in durability such as moisture and heat resistance even when used outdoors for a long period of time.
- the mixture was cooled to 50 ° C., and 68 parts by mass of triethylamine and 5000 parts by mass of water were added. Then, methyl ethyl ketone was removed at a temperature of 40 ° C. to 60 ° C., and the concentration was adjusted by adding water, whereby an aqueous urethane resin having a weight average molecular weight of 56700 was dispersed in water. )
- Example 1 100 parts by mass of the composition (I) obtained in Preparation Example 1 and 44 parts by mass of the composition (III) obtained in Preparation Example 3 were mixed. Next, 7 parts by mass of Becamine M-3 (manufactured by DIC Corporation, trimethoxymethylol type melamine resin, non-volatile content 80% by mass) and watersol WSA-950 (manufactured by DIC Corporation, epoxy having hydrolyzable silyl group) 8 parts by weight of a compound, nonvolatile content 100% by mass), and by stirring and adding water, heat sealant (X-1) comprising an aqueous resin composition (X-1) having a nonvolatile content of 20% by mass Got.
- Becamine M-3 manufactured by DIC Corporation, trimethoxymethylol type melamine resin, non-volatile content 80% by mass
- watersol WSA-950 manufactured by DIC Corporation, epoxy having hydrolyzable silyl group
- Example 2 An aqueous resin composition was prepared in the same manner as in Example 1 except that 100 parts by mass of the composition (II) obtained in Preparation Example 2 was used instead of 100 parts by mass of the composition (I) obtained in Preparation Example 1. A heat sealant (X-2) comprising the product (X-2) was obtained.
- Example 3 Aqueous solution was obtained in the same manner as in Example 1 except that the amount of Becamine M-3 (manufactured by DIC Corporation, trimethoxymethylol type melamine resin, nonvolatile content 80% by mass) was changed from 7 parts by mass to 2 parts by mass.
- a heat sealant (X-3) comprising the resin composition (X-3) was obtained.
- Example 4 Similar to Example 1 except that the amount of Watersol WSA-950 (manufactured by DIC Corporation, epoxy compound having hydrolyzable silyl group, nonvolatile content 80 mass%) is changed from 8 mass parts to 16 mass parts. Thus, a heat sealant (X-4) comprising the aqueous resin composition (X-4) was obtained.
- Watersol WSA-950 manufactured by DIC Corporation, epoxy compound having hydrolyzable silyl group, nonvolatile content 80 mass%
- Example 5 Similar to Example 1 except that the amount of Watersol WSA-950 (manufactured by DIC Corporation, epoxy compound having hydrolyzable silyl group, nonvolatile content 80% by mass) is changed from 8 parts by mass to 2 parts by mass. Thus, a heat sealant (X-5) comprising the aqueous resin composition (X-5) was obtained.
- Watersol WSA-950 manufactured by DIC Corporation, epoxy compound having hydrolyzable silyl group, nonvolatile content 80% by mass
- Example 6 72 parts by mass of the composition (I) obtained in Preparation Example 1 and 72 parts by mass of the composition (III) obtained in Preparation Example 3 were mixed and stirred, and then becamine M-3 (manufactured by DIC Corporation, trimethoxy). 7 parts by mass of a methylol type melamine resin, non-volatile content 80% by mass) and 10 parts by mass of Watersol WSA-950 (manufactured by DIC Corporation, epoxy compound having a hydrolyzable silyl group, non-volatile content 100% by mass), By mixing and adding water, a heat sealant (X-6) comprising an aqueous resin composition (X-6) having a nonvolatile content of 20% by mass was obtained.
- becamine M-3 manufactured by DIC Corporation, trimethoxy
- Watersol WSA-950 manufactured by DIC Corporation, epoxy compound having a hydrolyzable sily
- Example 7 Instead of 100 parts by mass of the composition (I) obtained in Preparation Example 1, 50 parts by mass of the composition (I) obtained in Preparation Example 1 and 50 parts by mass of the composition (II) obtained in Preparation Example 2 are used. Except for this, a heat sealant (X-7) comprising the aqueous resin composition (X-7) was obtained in the same manner as in Example 1.
- Example 8 instead of 7 parts by mass of Becamine M-3 (manufactured by DIC Corporation, trimethoxymethylol type melamine resin, nonvolatile content 80% by mass), Becamine J-101 (manufactured by DIC Corporation, hexamethoxymethylol type melamine resin, nonvolatile content 80) (Mass%)
- a heat sealant (X-8) comprising the aqueous resin composition (X-8) was obtained in the same manner as in Example 1 except that 7 parts by mass was used.
- Example 9 Instead of 8 parts by mass of Watersol WSA-950 (manufactured by DIC Corporation, hydrolyzable silyl group-containing epoxy compound, nonvolatile content: 100% by mass), Denacol EX-321 (manufactured by Nagase ChemteX Corporation, trimethylolpropane poly A heat sealant (X′-9) comprising the aqueous resin composition (X-9) was obtained in the same manner as in Example 1 except that 5 parts by mass of glycidyl ether (non-volatile content: 100% by mass) was used.
- Comparative Example 4 144 parts by mass of the composition (I) obtained in Preparation Example 1, 7 parts by mass of Becamine M-3 (manufactured by DIC Corporation, trimethoxymethylol type melamine resin, non-volatile content 80% by mass) and Watersol WSA-950 ( Mixing and stirring with 3 parts by mass of an epoxy compound having a hydrolyzable silyl group (non-volatile content: 100% by mass) manufactured by DIC Corporation, and adding water, an aqueous resin composition (X ′ -4) to obtain a heat sealant (X′-4).
- Becamine M-3 manufactured by DIC Corporation, trimethoxymethylol type melamine resin, non-volatile content 80% by mass
- Watersol WSA-950 Mixing and stirring with 3 parts by mass of an epoxy compound having a hydrolyzable silyl group (non-volatile content: 100% by mass) manufactured by DIC Corporation, and adding water, an aqueous resin composition (X ′ -4)
- Example 10 Aqueous solution was obtained in the same manner as in Example 1 except that the amount of Becamine M-3 (manufactured by DIC Corporation, trimethoxymethylol type melamine resin, nonvolatile content 80% by mass) was changed from 7 parts by mass to 2 parts by mass. A heat sealant (X′-11) comprising the resin composition (X′-11) was obtained.
- Example 11 Aqueous solution was obtained in the same manner as in Example 1 except that the amount of Becamine M-3 (manufactured by DIC Corporation, trimethoxymethylol type melamine resin, nonvolatile content 80% by mass) was changed from 7 parts by mass to 23 parts by mass.
- a heat sealant (X′-12) comprising the resin composition (X′-12) was obtained.
- Example 12 Similar to Example 1 except that the amount of Watersol WSA-950 (manufactured by DIC Corporation, epoxy compound having hydrolyzable silyl group, nonvolatile content 100% by mass) is changed from 8 parts by mass to 46 parts by mass. Thus, a heat sealant (X′-12) comprising the aqueous resin composition (X′-12) was obtained.
- Watersol WSA-950 manufactured by DIC Corporation, epoxy compound having hydrolyzable silyl group, nonvolatile content 100% by mass
- a film (length: 5 cm ⁇ width: 1 cm) made of ethylene-vinyl acetate as a nonpolar base material is placed, and then a vacuum pressure bonding apparatus is used for 150. By crimping them at 15 ° C. for 15 minutes, a laminate in which a polyethylene terephthalate film and a polyolefin film were bonded via the resin cured layer (heat seal layer) was obtained.
- Adhesion test method The adhesion of the laminate immediately after being produced by the above method was evaluated by a T-type peel test (1000 N cell) using a tensile tester (manufactured by Shimadzu Corporation). The adhesion was evaluated based on the adhesion between the heat seal layer and the ethylene-vinyl acetate film.
- the peel strength measured by the above method was approximately 30 N / cm or more, the adhesion was evaluated as excellent, and when the peel strength was 35 N / cm or more, the adhesion was evaluated as particularly excellent.
- the peel strength measured by the above method was approximately 25 N / cm or more, the adhesion was evaluated as excellent, and when the peel strength was 35 N / cm or more, the adhesion was evaluated as particularly excellent.
- a laminate having a peel strength ratio (retention rate) of the laminate after the moisture and heat resistance test of approximately 50% or more with respect to the peel strength of the laminate immediately after production is evaluated as being excellent in moisture and heat resistance. % Or more was evaluated as being particularly excellent in heat and humidity resistance.
- Retention rate (%) represents the ratio (retention rate) of the peel strength of the laminate after the heat and moisture resistance test to the peel strength of the laminate immediately after production.
- Example 1 It was found that the heat sealant obtained in Example 1 can exhibit excellent adhesion and moisture and heat resistance.
- the heat sealant having a polycarbonate structure in the aqueous urethane resin obtained in Example 2 has a slight decrease in wet heat resistance compared to the heat sealant (Example 1) containing an aqueous urethane resin having a polyester structure.
- the heat-sealing agent described in Example 3 has a slightly low content of the alkylated methylol melamine resin (c1)
- the heat-sealing agent described in Example 3 has excellent adhesion, but is somewhat low in terms of moisture and heat resistance, but can be used practically. It had level characteristics.
- Both the heat sealant described in Example 4 having a high content of the epoxy compound (c2) and the heat sealant described in Example 5 having a low content of the epoxy compound (c2) have good adhesion and heat-and-moisture resistance. there were.
- the heat sealant described in Example 6 in which the mass ratio of the water-based urethane resin and the water-based polyolefin resin is out of the preferred range is slightly low in terms of adhesion, although excellent in terms of adhesion and moist heat resistance.
- the heat sealing agent obtained by mixing a water-based urethane resin having a polycarbonate structure and a water-based urethane resin having a polyester structure was slightly low in terms of moisture and heat resistance due to the effect of their compatibility. It was found that the heat sealing agent described in Example 8 using a compound different from Example 1 as the alkylated methylol melamine resin (c1) can exhibit excellent adhesion and heat-and-moisture resistance.
- the heat-sealing agent described in Example 9 using a compound different from Example 1 as the epoxy compound (c2) had excellent adhesion and somewhat good heat and humidity resistance.
- the heat sealing agent of the comparative examples 6 and 9 which used the isocyanate type crosslinking agent instead of the said epoxy compound (c2), and the comparative example which used the isocyanate type crosslinking agent instead of the alkylation methylol melamine resin (c1). 7 and the heat seal agent described in Comparative Example 8 using a carbodiimide cross-linking agent instead of the epoxy compound (c2) can exhibit excellent adhesion, but have an adhesive property after the wet heat resistance test. Since it caused a significant decrease, it was not practical enough.
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Abstract
Description
本発明では、前記架橋剤(C)として、前記アルキル化メチロールメラミン樹脂(c1)を必須成分として使用し、かつ、前記エポキシ化合物(c2)を、前記アルキル化メチロールメラミン樹脂(c1)と組み合わせ使用することが、優れた耐湿熱性と各種基材に対する優れた密着性とを両立したヒートシール剤を得るうえで重要である。
本発明で使用する水性媒体(D)として、例えば、水、水と混和する有機溶剤、及び、これらの混合物が挙げられる。水と混和する有機溶剤としては、例えば、メタノール、エタノール、n-及びイソプロパノール等のアルコール類;アセトン、メチルエチルケトン等のケトン類;エチレングリコール、ジエチレングリコール、プロピレングリコール等のポリアルキレングリコール類;ポリアルキレングリコールのアルキルエーテル類;N-メチル-2-ピロリドン等のラクタム類、等が挙げられる。本発明では、水のみを用いても良く、また水及び水と混和する有機溶剤との混合物を用いても良く、水と混和する有機溶剤のみを用いても良い。安全性や環境に対する負荷の点から、水のみ、又は、水及び水と混和する有機溶剤との混合物が好ましく、水のみが特に好ましい。
温度計、窒素ガス導入管、攪拌機を備えた反応器中で窒素ガスを導入しながら、テレフタル酸830質量部、イソフタル酸830質量部、エチレングリコール374質量部、ネオペンチルグリコール604質量部及びジブチル錫オキサイド0.5質量部を仕込み180~230℃で5時間エステル化した後、酸価が1未満になるまで260℃で6時間重縮合反応することによって、酸価0.2、水酸基価74.5のポリエステルポリオール(a1’)を得た。
温度計、窒素ガス導入管、攪拌機を備えた反応器中で窒素ガスを導入しながら、ニッポラン980R(日本ポリウレタン工業(株)製、ポリカーボネートジオール、数平均分子量2,000)を1000質量部を混合し、80℃まで冷却した後、メチルエチルケトン671質量部を加え十分に攪拌し溶解させ、2,2’-ジメチロールプロピオン酸75質量部とヘキサメチレンジイソシアネート178質量部とを加えて75℃で8時間反応させた。
温度計、窒素ガス導入管、攪拌機を備えた反応器中で窒素ガスを導入しながら、ポレスターVS-1236(星光PMC株式会社製、無水マレイン酸変性ポリオレフィンの水分散体、重量平均分子量70000)を1000質量部入れ、80℃で3時間攪拌し溶融させ、次いで50℃まで冷却し、トリエチルアミン180質量部加えて中和した後、水2153質量部を加えて水溶化することにより、不揮発分30質量%の組成物(III)を得た。
調製例1で得た組成物(I)を100質量部と、調製例3で得た組成物(III)を44質量部と混合した。次いで、ベッカミンM-3(DIC株式会社製、トリメトキシメチロール型メラミン樹脂、不揮発分80質量%)を7質量部と、ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)を8質量部とを添加、攪拌し、水を加えることによって、不揮発分20質量%の水性樹脂組成物(X-1)からなるヒートシール剤(X-1)を得た。
調製例1で得た組成物(I)100質量部の代わりに、調製例2で得た組成物(II)を100質量部使用すること以外は、実施例1と同様の方法で水性樹脂組成物(X-2)からなるヒートシール剤(X-2)を得た。
ベッカミンM-3(DIC株式会社製、トリメトキシメチロール型メラミン樹脂、不揮発分80質量%)の使用量を7質量部から2質量部に変更すること以外は、実施例1と同様の方法で水性樹脂組成物(X-3)からなるヒートシール剤(X-3)を得た。
ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分80質量%)の使用量を8質量部を16質量部に変更すること以外は、実施例1と同様の方法で水性樹脂組成物(X-4)からなるヒートシール剤(X-4)を得た。
ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分80質量%)の使用量を8質量部から2質量部に変更すること以外は、実施例1と同様の方法で水性樹脂組成物(X-5)からなるヒートシール剤(X-5)を得た。
調製例1で得た組成物(I)72質量部と調製例3で得た組成物(III)72質量部とを混合及び攪拌し、次いで、ベッカミンM-3(DIC株式会社製、トリメトキシメチロール型メラミン樹脂、不揮発分80質量%)7質量部と、ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)10質量部とを添加、混合し、水を加えることによって、不揮発分20質量%の水性樹脂組成物(X-6)からなるヒートシール剤(X-6)を得た。
調製例1で得た組成物(I)100質量部の代わりに、調製例1で得た組成物(I)50質量部と調製例2で得た組成物(II)50質量部を使用すること以外は、実施例1と同様の方法で水性樹脂組成物(X-7)からなるヒートシール剤(X-7)を得た。
ベッカミンM-3(DIC株式会社製、トリメトキシメチロール型メラミン樹脂、不揮発分80質量%)7質量部の代わりに、ベッカミンJ-101(DIC株式会社製、ヘキサメトキシメチロール型メラミン樹脂、不揮発分80質量%)7質量部使用すること以外は、実施例1と同様の方法で水性樹脂組成物(X-8)からなるヒートシール剤(X-8)を得た。
ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)8質量部の代わりに、デナコールEX-321(ナガセケムテックス株式会社製、トリメチロールプロパンポリグリシジルエーテル、不揮発分100質量%)5質量部使用すること以外は、実施例1と同様の方法で水性樹脂組成物(X-9)からなるヒートシール剤(X‘-9)を得た。
調製例1で得た組成物(I)100質量部と、調製例3で得た組成物(III)44質量部とを混合、攪拌し、水を加えることによって、不揮発分20質量%の水性樹脂組成物(X’-1)からなるヒートシール剤(X’-1)を得た。
調製例1で得た組成物(I)100質量部と、調製例3で得た組成物(III)44質量部とを混合及び攪拌し、次いで、ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)8質量部と混合し、水を加えることによって、不揮発分20質量%の水性樹脂組成物(X’-2)からなるヒートシール剤(X’-2)を得た。
調製例1で得た組成物(I)100質量部に、調製例3で得た組成物(III)を44質量部混合及び攪拌し、次いで、ベッカミンM-3(DIC株式会社製、トリメトキシメチロール型メラミン樹脂、不揮発分80質量%)7質量部と混合し、水を加えることによって、不揮発分20質量%の水性樹脂組成物(X’-3)からなるヒートシール剤(X’-3)を得た。
調製例1で得られた組成物(I)144質量部と、ベッカミンM-3(DIC株式会社製、トリメトキシメチロール型メラミン樹脂、不揮発分80質量%)7質量部及びウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)3質量部とを混合、攪拌し、水を加えることによって、不揮発分20質量%の水性樹脂組成物(X’-4)からなるヒートシール剤(X’-4)を得た。
調製例3で得られた組成物(III)144質量部と、ベッカミンM-3(DIC株式会社製、トリメトキシメチロール型メラミン樹脂、不揮発分80質量%)7質量部及びウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)18質量部とを混合、攪拌し、水を加えることによって、不揮発分20質量%の水性樹脂組成物(X’-5)からなるヒートシール剤(X’-5)を得た。
ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基含有エポキシ樹脂、不揮発分100質量%)8質量部の代わりに、アクアネート210(日本ポリウレタン工業株式会社製、水分散性ポリイソシアネート架橋剤、不揮発分100質量%)を8質量部使用すること以外は、実施例1と同様の方法で水性樹脂組成物(X’-7)からなるヒートシール剤(X’-7)を得た。
ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)7質量の代わりに、アクアネート210(日本ポリウレタン工業株式会社製、水分散性ポリイソシアネート架橋剤、不揮発分100質量%)を8質量部使用すること以外は、実施例1と同様の方法で水性樹脂組成物(X’-8)からなるヒートシール剤(X’-8)を得た。
ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)8質量部の代わりに、ハイドランアシスターCS-7(DIC株式会社製、水分散性カルボジイミド化合物、不揮発分40質量%)を30質量部使用すること以外は、実施例1と同様の方法で水性樹脂組成物(X’-9)からなるヒートシール剤(X’-9)を得た。
ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)7質量部の代わりに、CR-5L(DIC株式会社製、水溶性エポキシ化合物、不揮発分100質量%)を5質量部と、ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)8質量部の代わりに、アクアネート210(日本ポリウレタン工業株式会社製、水分散性ポリイソシアネート架橋剤、不揮発分100質量%)を8質量部使用すること以外は、実施例1と同様の方法で水性樹脂組成物(X’-10)からなるヒートシール剤(X’-10)を得た。
ベッカミンM-3(DIC株式会社製、トリメトキシメチロール型メラミン樹脂、不揮発分80質量%)の使用量を7質量部から2質量部に変更すること以外は、実施例1と同様の方法で水性樹脂組成物(X’-11)からなるヒートシール剤(X’-11)を得た。
ベッカミンM-3(DIC株式会社製、トリメトキシメチロール型メラミン樹脂、不揮発分80質量%)の使用量を7質量部から23質量部に変更すること以外は、実施例1と同様の方法で水性樹脂組成物(X’-12)からなるヒートシール剤(X’-12)を得た。
ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)の使用量を8質量部から46質量部に変更すること以外は、実施例1と同様の方法で水性樹脂組成物(X’-12)からなるヒートシール剤(X’-12)を得た。
ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基を有するエポキシ化合物、不揮発分100質量%)の使用量を8質量部から1質量部に変更すること以外は、実施例1と同様の方法で水性樹脂組成物(X’-13)からなるヒートシール剤(X’-13)を得た。
極性基材であるポリエチレンテレフタレートフィルムの表面に、乾燥膜厚が5μmとなるよう、前記実施例及び比較例で得たヒートシール剤を塗布し、150℃の条件で5分間乾燥することによって、前記フィルム用面に架橋した樹脂硬化層(ヒートシール層)が設けられた積層体を得た。
前記方法で製造した直後の積層体の密着性は、引張り試験機(株式会社 島津製作所製オートグラフ)を用いT型剥離試験(1000Nセル)によって評価した。前記密着性は、ヒートシール層と、前記エチレン-酢酸ビニルからなるフィルムとの間の密着性に基づいて評価した。
前記で得た積層体を120℃×100%RHの条件に設定された恒温恒湿機内に72時間静置し湿熱試験を行った。前記静置後の積層体の密着力を、前記と同様の方法によって測定し評価した。
「M-3」;ベッカミンM-3(DIC株式会社製、トリメトキシメチロール型メラミン樹脂、不揮発分80質量%)
「WSA-950」;ウォーターゾールWSA-950(DIC株式会社製、加水分解性シリル基含有エポキシ樹脂、不揮発分100質量%)
「CR-5L」;CR-5L(DIC株式会社製、水溶性エポキシ化合物、不揮発分100質量%)
「アクアネート210」;アクアネート210(日本ポリウレタン工業株式会社製、水分散性ポリイソシアネート架橋剤、不揮発分100質量%)
「J-101」;ベッカミンJ-101(DIC株式会社製、ヘキサメトキシメチロール型メラミン樹脂、不揮発分80質量%)
「CS-7」;ハイドランアシスターCS-7(DIC株式会社製、水分散性カルボジイミド化合物、不揮発分40質量%)
「アルキル化メチロールメラミン樹脂(c1)の含有量[質量%]」;水性ウレタン樹脂及び水性ポリオレフィン樹脂の合計質量に対するアルキル化メチロールメラミン樹脂の質量割合を表す。
Claims (9)
- 水性ウレタン樹脂(A)、水性ポリオレフィン樹脂(B)、架橋剤(C)及び水性媒体(D)を含有するヒートシール剤であって、前記架橋剤(C)がアルキル化メチロールメラミン樹脂(c1)とエポキシ化合物(c2)とを含有し、前記アルキル化メチロールメラミン樹脂(c1)が、前記水性ウレタン樹脂(A)及び前記水性ポリオレフィン樹脂(B)の合計質量に対して5質量%~50質量%の範囲で含まれ、前記水性ウレタン樹脂(A)及び水性ポリオレフィン樹脂(B)のいずれか一方または両方が、エポキシ基と反応しうる官能基[X]を有し、かつ、前記官能基[X]の合計物質量に対する前記エポキシ化合物(c2)の有するエポキシ基の物質量の割合〔エポキシ基の物質量/官能基[X]の合計物質量〕が5/1~1/5であることを特徴とするヒートシール剤。
- 前記水性ウレタン樹脂(A)及び水性ポリオレフィン樹脂(B)のいずれか一方または両方が有する前記官能基[X]が、カルボキシル基、水酸基及びアミノ基からなる群より選ばれる1種以上である請求項1に記載のヒートシール剤。
- 前記水性ウレタン樹脂(A)が、芳香族環構造含有ポリエステルポリオール、及び、ポリカーボネートポリオールからなる群より選ばれる1種以上を含むポリオール(a1)と、ポリイソシアネート(a2)とを反応させることによって得られるものである請求項1に記載のヒートシール剤。
- 前記エポキシ化合物(c2)が、加水分解性シリル基を有するエポキシ化合物、または、トリメチロールプロパンポリグリシジルエーテル、または、グリセリントリグリシジルエーテルである請求項1に記載のヒートシール剤。
- 極性基材(I)の表面に、請求項1~4のいずれか1項に記載のヒートシール剤を塗布し乾燥することによって形成されるヒートシール層を設け、前記ヒートシール層表面に非極性基材(II)を載置し、次いで80℃~180℃で加熱することによって得られる積層体。
- 前記極性基材(I)がポリエチレンテレフタレート基材、ポリプロピレン基材、ポリカーボネート基材またはポリアミド基材であり、かつ、前記非極性基材(II)がエチレン-酢酸ビニル共重合体からなる基材である請求項5に記載の積層体。
- 極性基材(I)表面に、請求項1~4のいずれか1項に記載のヒートシール剤を塗布し乾燥することによって、前記水性ウレタン樹脂(A)及び前記水性ポリオレフィン樹脂(B)のいずれか一方または両方が有する官能基[X]と、前記エポキシ化合物(c2)が有するエポキシ基とを反応させるとともに、
前記アルキル化メチロールメラミン樹脂(c1)の自己架橋反応、
及び/または、
前記官能基[X]と前記エポキシ化合物(c2)との反応によって生成した水酸基と前記アルキル化メチロールメラミン樹脂(c1)との反応
を進行させることによってヒートシール層を設け、次いで、前記ヒートシール層表面に非極性基材(II)を載置し、次いで80℃~180℃で加熱することによって、前記極性基材(I)及び非極性基材(II)を接着することを特徴とする積層体の製造方法。 - 太陽電池を構成する受光面に対して反対側の、エチレン-酢酸ビニル共重合体からなる基材表面上に、請求項1~4のいずれか1項に記載のヒートシール剤を用いて形成されるヒートシール層を有し、該ヒートシール層上に、ポリエチレンテレフタレート基材、ポリプロピレン基材、ポリカーボネート基材またはポリアミド基材からなるバックシート層を有することを特徴とする太陽電池モジュール。
- ポリエチレンテレフタレート基材、ポリプロピレン基材、ポリカーボネート基材またはポリアミド基材からなるシート表面に、請求項1~4のいずれか1項に記載のヒートシール剤を用いて形成されるヒートシール層を備えた積層シートを、
太陽電池を構成する受光面に対して反対側の面を構成するエチレン-酢酸ビニル共重合体からなる基材表面に、
前記積層シートのヒートシール層と前記エチレン-酢酸ビニル共重合体からなる基材表面とが接触するように載置し、加熱することを特徴とする太陽電池モジュールの製造方法。
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JP2012526213A JP5071750B1 (ja) | 2011-03-11 | 2012-02-23 | ヒートシール剤、それを用いた積層体及び太陽電池モジュール |
US14/004,265 US20130340816A1 (en) | 2011-03-11 | 2012-02-23 | Heat-sealing material, laminated body, and solar-cell module using the same |
CN201280012825.4A CN103429694B (zh) | 2011-03-11 | 2012-02-23 | 热密封剂、使用该热密封剂的层叠体及太阳能电池模块 |
KR1020137021334A KR101882291B1 (ko) | 2011-03-11 | 2012-02-23 | 히트 씰제, 그것을 사용한 적층체 및 태양 전지 모듈 |
EP12758273.2A EP2684931A4 (en) | 2011-03-11 | 2012-02-23 | THERMOSOUDAGE AGENT AND LAMINATE AND PHOTOPILE MODULE USING THE SAME |
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WO2016129494A1 (ja) * | 2015-02-09 | 2016-08-18 | 東レ株式会社 | 太陽電池モジュール用接着フィルム及び太陽電池モジュール |
JP2017109374A (ja) * | 2015-12-16 | 2017-06-22 | 三菱樹脂株式会社 | フィルム及び偏光板 |
JP2019203040A (ja) * | 2018-05-21 | 2019-11-28 | Dic株式会社 | ヒートシール剤、ヒートシール性フィルム及び包装材料 |
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JPWO2012124445A1 (ja) | 2014-07-17 |
TW201245329A (en) | 2012-11-16 |
CN103429694A (zh) | 2013-12-04 |
US20130340816A1 (en) | 2013-12-26 |
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