JP2021123971A - Method of preventing concrete pieces from peeling off - Google Patents
Method of preventing concrete pieces from peeling off Download PDFInfo
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- JP2021123971A JP2021123971A JP2020019122A JP2020019122A JP2021123971A JP 2021123971 A JP2021123971 A JP 2021123971A JP 2020019122 A JP2020019122 A JP 2020019122A JP 2020019122 A JP2020019122 A JP 2020019122A JP 2021123971 A JP2021123971 A JP 2021123971A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000004840 adhesive resin Substances 0.000 claims abstract description 83
- 229920006223 adhesive resin Polymers 0.000 claims abstract description 83
- 239000000203 mixture Substances 0.000 claims abstract description 52
- -1 aminosilane compound Chemical class 0.000 claims abstract description 27
- 239000003822 epoxy resin Substances 0.000 claims abstract description 23
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 23
- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 claims abstract description 22
- 150000001875 compounds Chemical class 0.000 claims abstract description 21
- 229920005989 resin Polymers 0.000 claims abstract description 19
- 239000011347 resin Substances 0.000 claims abstract description 19
- 239000004014 plasticizer Substances 0.000 claims abstract description 11
- 239000010410 layer Substances 0.000 claims abstract description 8
- 239000011241 protective layer Substances 0.000 claims abstract description 5
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 4
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 24
- 238000007718 adhesive strength test Methods 0.000 abstract description 3
- 239000011229 interlayer Substances 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 10
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- MQWFLKHKWJMCEN-UHFFFAOYSA-N n'-[3-[dimethoxy(methyl)silyl]propyl]ethane-1,2-diamine Chemical compound CO[Si](C)(OC)CCCNCCN MQWFLKHKWJMCEN-UHFFFAOYSA-N 0.000 description 8
- 229920002050 silicone resin Polymers 0.000 description 8
- 239000000126 substance Substances 0.000 description 6
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 229910000077 silane Inorganic materials 0.000 description 4
- 239000012024 dehydrating agents Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000011164 primary particle Substances 0.000 description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 3
- KUAUJXBLDYVELT-UHFFFAOYSA-N 2-[[2,2-dimethyl-3-(oxiran-2-ylmethoxy)propoxy]methyl]oxirane Chemical compound C1OC1COCC(C)(C)COCC1CO1 KUAUJXBLDYVELT-UHFFFAOYSA-N 0.000 description 2
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 description 2
- VZSCYDNKUMPKGV-UHFFFAOYSA-N 4-methyl-n-(3-trimethoxysilylpropyl)pentan-2-imine Chemical compound CO[Si](OC)(OC)CCCN=C(C)CC(C)C VZSCYDNKUMPKGV-UHFFFAOYSA-N 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- AYOHIQLKSOJJQH-UHFFFAOYSA-N dibutyltin Chemical compound CCCC[Sn]CCCC AYOHIQLKSOJJQH-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 150000002576 ketones Chemical class 0.000 description 2
- PHQOGHDTIVQXHL-UHFFFAOYSA-N n'-(3-trimethoxysilylpropyl)ethane-1,2-diamine Chemical compound CO[Si](OC)(OC)CCCNCCN PHQOGHDTIVQXHL-UHFFFAOYSA-N 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- AOBIOSPNXBMOAT-UHFFFAOYSA-N 2-[2-(oxiran-2-ylmethoxy)ethoxymethyl]oxirane Chemical compound C1OC1COCCOCC1CO1 AOBIOSPNXBMOAT-UHFFFAOYSA-N 0.000 description 1
- RNLHGQLZWXBQNY-UHFFFAOYSA-N 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine Chemical compound CC1(C)CC(N)CC(C)(CN)C1 RNLHGQLZWXBQNY-UHFFFAOYSA-N 0.000 description 1
- PRKPGWQEKNEVEU-UHFFFAOYSA-N 4-methyl-n-(3-triethoxysilylpropyl)pentan-2-imine Chemical compound CCO[Si](OCC)(OCC)CCCN=C(C)CC(C)C PRKPGWQEKNEVEU-UHFFFAOYSA-N 0.000 description 1
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- KBJFYLLAMSZSOG-UHFFFAOYSA-N n-(3-trimethoxysilylpropyl)aniline Chemical compound CO[Si](OC)(OC)CCCNC1=CC=CC=C1 KBJFYLLAMSZSOG-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Bridges Or Land Bridges (AREA)
- Lining And Supports For Tunnels (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
Abstract
Description
本発明は、橋梁、トンネル又は建築物等のコンクリート構造物の表面からコンクリート片が剥落するのを防止する工法に関するものである。 The present invention relates to a construction method for preventing concrete pieces from peeling off from the surface of a concrete structure such as a bridge, tunnel or building.
従来より、コンクリート躯体の表面からコンクリート片が剥落するのを防止するため、以下の工法で、コンクリート躯体の表面を硬化接着樹脂で被覆することが行われている。すなわち、コンクリート躯体の表面側に、接着樹脂組成物を塗布する第一工程と、第一工程で塗布された接着樹脂組成物上に網状シートを貼着する第二工程と、第二工程で貼着された網状シート上に接着樹脂組成物を塗布する第三工程と、第三工程で塗布された接着樹脂組成物上に保護層を設ける工程よりなる工法が採用されている（特許文献１、請求項１）。そして、接着樹脂組成物としては、架橋性シリル基を有する硬化性樹脂（以下、「変成シリコーン樹脂」ともいう。）とエポキシ樹脂を含むものが用いられており（特許文献１、請求項６）、この接着樹脂組成物を硬化せしめてコンクリート躯体の表面を被覆するのである。すなわち、変成シリコーン樹脂及びエポキシ樹脂を硬化させた硬化接着樹脂で被覆することが提案されている。 Conventionally, in order to prevent concrete pieces from peeling off from the surface of the concrete skeleton, the surface of the concrete skeleton is coated with a hardened adhesive resin by the following method. That is, the first step of applying the adhesive resin composition to the surface side of the concrete skeleton, the second step of sticking the net-like sheet on the adhesive resin composition applied in the first step, and the second step of sticking. A construction method consisting of a third step of applying the adhesive resin composition on the attached net-like sheet and a step of providing a protective layer on the adhesive resin composition applied in the third step is adopted (Patent Document 1, Patent Document 1, Claim 1). As the adhesive resin composition, a curable resin having a crosslinkable silyl group (hereinafter, also referred to as "modified silicone resin") and an epoxy resin are used (Patent Document 1, Claim 6). , This adhesive resin composition is cured to coat the surface of the concrete skeleton. That is, it has been proposed to coat the modified silicone resin and the epoxy resin with a cured adhesive resin.
しかるに、かかる工法の場合、コンクリート躯体と被覆された硬化接着樹脂の一体性を評価するため、引張接着強さ試験を行うと、十分な引張接着強さが実現できないという憾みがあった。具体的には、引張接着強さ試験を行うと、網状シートの箇所で硬化接着樹脂が層間破壊を起こしやすいということがあった。 However, in the case of such a construction method, in order to evaluate the integrity of the concrete skeleton and the coated hardened adhesive resin, a tensile adhesive strength test was conducted, and there was a pity that sufficient tensile adhesive strength could not be realized. Specifically, when the tensile adhesive strength test was performed, the cured adhesive resin was liable to cause interlayer fracture at the site of the reticulated sheet.
本発明の課題は、コンクリート躯体の表面を硬化接着樹脂で被覆する、コンクリート片の剥落防止工法において、引張接着強さ試験の際に、網状シートの箇所で硬化接着樹脂が層間破壊を起こしにくい工法を提供することにある。 An object of the present invention is a method for preventing the concrete pieces from peeling off, in which the surface of the concrete skeleton is coated with a hardened adhesive resin. Is to provide.
本発明は、硬化接着樹脂を得るための接着樹脂組成物として、特定のものを用いることにより、上記課題を解決したものである。すなわち、本発明は、コンクリート躯体の表面側に、接着樹脂組成物を塗布する第一工程と、該第一工程で塗布された接着樹脂組成物上に網状シートを貼着する第二工程と、該第二工程で貼着された網状シート上に接着樹脂組成物を塗布する第三工程よりなるコンクリート片の剥落防止工法において、前記接着樹脂組成物が、架橋性シリル基を有する硬化性樹脂とエポキシ樹脂とアミノシラン化合物又はケチミンシラン化合物を含んでいることを特徴とするコンクリート片の剥落防止工法に関するものである。 The present invention solves the above problems by using a specific adhesive resin composition for obtaining a cured adhesive resin. That is, the present invention includes a first step of applying the adhesive resin composition to the surface side of the concrete skeleton, and a second step of attaching a net-like sheet on the adhesive resin composition applied in the first step. In the method for preventing the peeling of concrete pieces, which comprises the third step of applying the adhesive resin composition on the net-like sheet attached in the second step, the adhesive resin composition is a curable resin having a crosslinkable silyl group. The present invention relates to a method for preventing peeling of concrete pieces, which comprises an epoxy resin and an aminosilane compound or a ketiminesilane compound.
本発明の第一工程は、コンクリート躯体の表面側に接着樹脂組成物を塗布する工程である。この第一工程は、コンクリート躯体の表面に直接接着樹脂組成物を塗布してもよいし、コンクリート躯体の表面に設けたプライマー層の表面に接着樹脂組成物を塗布してもよい。コンクリート躯体の表面と接着樹脂組成物の密着性が十分であるときは、プライマー層を設ける必要性は少ない。コンクリート躯体の表面と接着樹脂組成物の密着性が不十分であるときは、この密着性を向上させるためプライマー層を設けるのが好ましい。プライマー層を設けるには、コンクリート躯体の表面にエポキシ系樹脂等よりなる従来公知のプライマーを塗布すればよい。 The first step of the present invention is a step of applying the adhesive resin composition to the surface side of the concrete skeleton. In this first step, the adhesive resin composition may be applied directly to the surface of the concrete skeleton, or the adhesive resin composition may be applied to the surface of the primer layer provided on the surface of the concrete skeleton. When the adhesion between the surface of the concrete skeleton and the adhesive resin composition is sufficient, it is less necessary to provide a primer layer. When the adhesion between the surface of the concrete skeleton and the adhesive resin composition is insufficient, it is preferable to provide a primer layer in order to improve the adhesion. In order to provide the primer layer, a conventionally known primer made of an epoxy resin or the like may be applied to the surface of the concrete skeleton.
第一工程で用いる接着樹脂組成物は、架橋性シリル基を有する硬化性樹脂とエポキシ樹脂とアミノシラン化合物又はケチミンシラン化合物を含んでいる。架橋性シリル基を有する硬化性樹脂としては、いわゆる変成シリコーン樹脂やシリル化ウレタン樹脂と呼称されているものを採用すればよい。具体的には、主鎖がアクリル骨格で末端又は側鎖に架橋性シリル基を有するアクリル系変成シリコーン樹脂、主鎖がポリオキシアルキレン骨格で末端に架橋性シリル基を有するポリエーテル系変成シリコーン樹脂又は主鎖にウレタン結合を持ち末端又は側鎖に架橋性シリル基を有するシリル化ウレタン樹脂等が、単独で又は混合して用いられる。本発明は、屋外で用いられるコンクリート構造物を構築する工法であるので、耐候性に優れたアクリル系変成シリコーン樹脂を単独で又は他の変成シリコーン樹脂やシリル化ウレタン樹脂と混合して採用するのが好ましい。架橋性シリル基を有する硬化性樹脂の数平均分子量は任意であり、１０００〜５０００００の範囲、特に好ましくは１００００〜３０００００の範囲で適宜採用しうる。 The adhesive resin composition used in the first step contains a curable resin having a crosslinkable silyl group, an epoxy resin, an aminosilane compound or a ketiminesilane compound. As the curable resin having a crosslinkable silyl group, what is called a so-called modified silicone resin or silylated urethane resin may be adopted. Specifically, an acrylic modified silicone resin having an acrylic skeleton in the main chain and having a crosslinkable silyl group at the end or side chain, and a polyether modified silicone resin having a polyoxyalkylene skeleton in the main chain and having a crosslinkable silyl group at the end. Alternatively, a silylated urethane resin or the like having a urethane bond in the main chain and a crosslinkable silyl group in the terminal or side chain is used alone or in combination. Since the present invention is a method for constructing a concrete structure used outdoors, an acrylic modified silicone resin having excellent weather resistance is used alone or in combination with another modified silicone resin or silylated urethane resin. Is preferable. The number average molecular weight of the curable resin having a crosslinkable silyl group is arbitrary, and may be appropriately adopted in the range of 1000 to 500,000, particularly preferably in the range of 1000 to 300000.
エポキシ樹脂としては、従来公知のエポキシ樹脂を採用すればよい。具体的には、ビスフェノールＡ型エポキシ樹脂やビスフェノールＦ型エポキシ樹脂等のビスフェノール型エポキシ樹脂又はネオペンチルグリコールジグリシジルエーテルやポリプロピレングリコールジグリシジルエーテル等のグリシジルエーテル型エポキシ樹脂が、単独で又は混合して用いられる。エポキシ樹脂のエポキシ当量は任意であり、１００〜４００の範囲で適宜採用しうる。 As the epoxy resin, a conventionally known epoxy resin may be used. Specifically, bisphenol type epoxy resins such as bisphenol A type epoxy resin and bisphenol F type epoxy resin, or glycidyl ether type epoxy resins such as neopentyl glycol diglycidyl ether and polypropylene glycol diglycidyl ether are used alone or in combination. Used. The epoxy equivalent of the epoxy resin is arbitrary and may be appropriately adopted in the range of 100 to 400.
アミノシラン化合物としても、従来公知のものを採用すればよい。具体的には、Ｎ−２−（アミノエチル）−３−アミノプロピルメチルジメトキシシラン、Ｎ−２（アミノエチル）−３−アミノプロピルトリメトキシシラン、３−アミノプロピルトリメトキシシラン、３−アミノプロピルトリエトキシシラン又はＮ−フェニル−３−アミノプロピルトリメトキシシラン等を単独で又は混合して用いればよい。アミノシラン化合物は、主として、架橋性シリル基を有する硬化性樹脂及びエポキシ樹脂と反応し、両者を架橋して硬化接着樹脂の引張接着強さを向上させるものである。 As the aminosilane compound, a conventionally known compound may be adopted. Specifically, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2 (aminoethyl) -3-aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyl Triethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, etc. may be used alone or in combination. The aminosilane compound mainly reacts with a curable resin having a crosslinkable silyl group and an epoxy resin, and crosslinks both to improve the tensile adhesive strength of the curable adhesive resin.
ケチミンシラン化合物は、アミノシラン化合物とケトンの脱水縮合により生成する化合物で、従来公知のものを採用すればよい。具体的には、３−トリメトキシシリル−Ｎ−（１，３−ジメチル−ブチリデン）プロピルアミン又は３−トリエトキシシリル−Ｎ−（１，３−ジメチル−ブチリデン）プロピルアミン等を単独で又は混合して用いればよい。ケチミンシラン化合物は、湿気によりアミノシラン化合物を生成するもので、上述したアミノシラン化合物と同様に硬化接着樹脂の引張接着強さを向上させるものである。 The ketimine silane compound is a compound produced by dehydration condensation of an aminosilane compound and a ketone, and conventionally known compounds may be adopted. Specifically, 3-trimethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine or 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine or the like is used alone or mixed. And use it. The ketimine silane compound produces an aminosilane compound by moisture, and like the above-mentioned aminosilane compound, it improves the tensile adhesive strength of the cured adhesive resin.
接着樹脂組成物中には、可塑剤や充填剤等の他の物質が含有されていてもよい。可塑剤は、接着樹脂組成物の物性を調整したり、粘度を調整して塗布しやすくするためのものである。特に、アクリル樹脂よりなる可塑剤（以下、「アクリル系可塑剤」という。）を用いれば、塗布しやすくなると共に、耐候性に優れているため、主として屋外で用いられる本発明に係る工法においては、好適である。アクリル系可塑剤は、数平均分子量が１５００〜８０００程度のものであり、一般的に無官能のポリアクリレートである。充填剤は接着樹脂組成物の増量及び強度向上のために用いられるものであり、炭酸カルシウム、表面処理炭酸カルシウム又はガラスバルーン等の従来公知の材料が単独で又は混合して用いられる。 The adhesive resin composition may contain other substances such as a plasticizer and a filler. The plasticizer is for adjusting the physical properties of the adhesive resin composition and adjusting the viscosity to facilitate application. In particular, if a plasticizer made of an acrylic resin (hereinafter referred to as "acrylic plasticizer") is used, it is easy to apply and has excellent weather resistance. Therefore, in the construction method according to the present invention, which is mainly used outdoors. , Suitable. Acrylic plasticizers have a number average molecular weight of about 1500 to 8000 and are generally non-functional polyacrylates. The filler is used for increasing the amount and strength of the adhesive resin composition, and conventionally known materials such as calcium carbonate, surface-treated calcium carbonate and glass balloon are used alone or in combination.
接着樹脂組成物は、一液型の組成物として提供されてもよいし、二液型等の接着樹脂キットとして提供されてもよい。一液型の組成物とする場合、ケチミンシラン化合物を配合する。アミノシラン化合物を配合すると、提供中に接着樹脂組成物が硬化してしまい、塗布しにくくなる。二液型等の接着樹脂キットとして提供する場合、アミノシラン化合物でもケチミンシラン化合物でも使用しうるが、アミノシラン化合物及びケチミンシラン化合物は、架橋性シリル基を有する硬化性樹脂及びエポキシ樹脂とは別個に提供される。すなわち、具体的には、架橋性シリル基を有する硬化性樹脂とエポキシ樹脂を含むＡ剤と、アミノシラン化合物又はケチミンシラン化合物を含むＢ剤との組み合わせとして提供される。 The adhesive resin composition may be provided as a one-component type composition, or may be provided as a two-component type adhesive resin kit. When making a one-component composition, a ketimine silane compound is blended. When the aminosilane compound is blended, the adhesive resin composition is cured during the provision, which makes it difficult to apply. When provided as a two-component adhesive resin kit, either an aminosilane compound or a ketiminesilane compound can be used, but the aminosilane compound and the ketiminesilane compound are provided separately from the curable resin and the epoxy resin having a crosslinkable silyl group. .. That is, specifically, it is provided as a combination of an agent A containing a curable resin having a crosslinkable silyl group and an epoxy resin, and an agent B containing an aminosilane compound or a ketiminesilane compound.
接着樹脂キットのＡ剤中には、脱水剤が含有されているのが好ましい。架橋性シリル基を有する硬化性樹脂は湿気によって硬化するので、Ａ剤中から湿気を除去するためである。脱水剤としては、酸化カルシウムやテトラエトキシシラン等の従来公知のものを採用しうる。接着樹脂キットのＢ剤中には、架橋性シリル基を有する硬化性樹脂の硬化触媒及びエポキシ樹脂の硬化剤が含有されているのが好ましい。前者の硬化触媒としてはジブチル錫等の従来公知のものが採用され、後者の硬化剤としてもポリアミン化合物やジアミンとケトンの脱水縮合物であるケチミン化合物等の従来公知のものが採用される。これらの硬化触媒を均一に分散混合するため、液状の無官能アクリル系可塑剤をＢ剤中に配合しておくのが好ましい。 It is preferable that the dehydrating agent is contained in the agent A of the adhesive resin kit. This is because the curable resin having a crosslinkable silyl group is cured by moisture, so that moisture is removed from the agent A. As the dehydrating agent, conventionally known ones such as calcium oxide and tetraethoxysilane can be adopted. It is preferable that the agent B of the adhesive resin kit contains a curing catalyst for a curable resin having a crosslinkable silyl group and a curing agent for an epoxy resin. As the former curing catalyst, conventionally known ones such as dibutyltin are adopted, and as the latter curing agent, conventionally known ones such as polyamine compounds and ketimine compounds which are dehydration condensates of diamines and ketones are adopted. In order to uniformly disperse and mix these curing catalysts, it is preferable to mix a liquid non-functional acrylic plasticizer in the agent B.
接着樹脂組成物中の各化合物の配合量は、架橋性シリル基を有する硬化性樹脂１００質量部に対し、概ね、以下のとおりである。すなわち、エポキシ樹脂は５〜２０質量部程度であり、アミノシラン化合物又はケチミンシラン化合物は１〜１０質量部程度である。また、任意に配合される、アクリル系可塑剤は５〜１５質量部程度であり、充填剤は５０〜２００質量部程度であり、脱水剤、硬化剤及び硬化触媒は１〜２０質量部程度である。 The blending amount of each compound in the adhesive resin composition is generally as follows with respect to 100 parts by mass of the curable resin having a crosslinkable silyl group. That is, the epoxy resin is about 5 to 20 parts by mass, and the aminosilane compound or the ketiminesilane compound is about 1 to 10 parts by mass. The amount of the acrylic plasticizer to be optionally blended is about 5 to 15 parts by mass, the amount of the filler is about 50 to 200 parts by mass, and the amount of the dehydrating agent, the curing agent and the curing catalyst is about 1 to 20 parts by mass. be.
本発明の第二工程は、第一工程で塗布された接着樹脂組成物上に網状シートを貼着する工程である。網状シートを貼着するには、第一工程で塗布された接着樹脂組成物が未硬化の状態において、接着樹脂組成物上に網状シートを積層押圧すればよい。網状シートとしては、従来公知のものを採用すればよい。具体的には、ビニロン繊維、ポリエステル繊維、ポリプロピレン繊維或いはアラミド繊維等の合成繊維又は炭素繊維やガラス繊維等の無機繊維よりなる２軸或いは３軸メッシュシート、合成繊維製編織物又は合成樹脂製ネット等が用いられる。 The second step of the present invention is a step of sticking a net-like sheet on the adhesive resin composition applied in the first step. In order to attach the net-like sheet, the net-like sheet may be laminated and pressed on the adhesive resin composition in a state where the adhesive resin composition applied in the first step is uncured. As the net-like sheet, a conventionally known sheet may be adopted. Specifically, a biaxial or triaxial mesh sheet made of synthetic fibers such as vinylon fibers, polyester fibers, polypropylene fibers or aramid fibers or inorganic fibers such as carbon fibers and glass fibers, synthetic fiber knitted fabrics or synthetic resin nets. Etc. are used.
本発明の第三工程は、第二工程で貼着された網状シート上に接着樹脂組成物を塗布する工程である。第三工程で用いる接着樹脂組成物は、第一工程で用いた接着樹脂組成物と同一である。第三工程は、第一工程で塗布された接着樹脂組成物が未硬化の状態で行われてもよいし、硬化した後に行われてもよい。 The third step of the present invention is a step of applying the adhesive resin composition on the net-like sheet attached in the second step. The adhesive resin composition used in the third step is the same as the adhesive resin composition used in the first step. The third step may be carried out in a state where the adhesive resin composition applied in the first step is uncured, or may be carried out after being cured.
第三工程によって、コンクリート躯体の表面側を硬化接着樹脂で被覆することにより、本発明に係る工法は完了する。すなわち、硬化接着樹脂表面に保護層を設ける工程が不要となる。これは、硬化接着樹脂の引張接着強さが固有的に高いので、経年劣化しても引張接着強さを高く維持しうるからである。しかしながら、従来公知の保護層を設けても差し支えないことは、もちろんである。 By coating the surface side of the concrete skeleton with the cured adhesive resin by the third step, the construction method according to the present invention is completed. That is, the step of providing a protective layer on the surface of the cured adhesive resin becomes unnecessary. This is because the tensile adhesive strength of the cured adhesive resin is inherently high, so that the tensile adhesive strength can be maintained high even if it deteriorates over time. However, it goes without saying that a conventionally known protective layer may be provided.
本発明に係るコンクリート片の剥落防止工法に用いる接着樹脂組成物は、架橋性シリル基を有する硬化性樹脂とエポキシ樹脂とアミノシラン化合物又はケチミンシラン化合物の少なくとも三者によって硬化接着樹脂が生成されるもので、高引張接着強さの硬化接着樹脂が得られるという効果を奏する。特に、硬化性樹脂として、主鎖がアクリル骨格で末端又は側鎖に架橋性シリル基を有するアクリル系変成シリコーン樹脂を採用し、アクリル系可塑剤を配合した接着樹脂組成物を用いれば、硬化接着樹脂の耐候性も向上し、経年劣化しにくいという効果も奏する。 The adhesive resin composition used in the method for preventing peeling of concrete pieces according to the present invention is a curable resin composed of at least three of a curable resin having a crosslinkable silyl group, an epoxy resin, an aminosilane compound or a ketiminesilane compound. , It has the effect of obtaining a cured adhesive resin with high tensile adhesive strength. In particular, if an acrylic modified silicone resin having an acrylic skeleton as the main chain and a crosslinkable silyl group at the end or side chain is used as the curable resin and an adhesive resin composition containing an acrylic plastic is used, it is cured and adhered. The weather resistance of the resin is also improved, and the effect of being less likely to deteriorate over time is also achieved.
実施例１
［Ａ剤の準備］
主鎖がポリアクリル酸エステルで末端又は側鎖に架橋性シリル基を有する重合体と主鎖がポリオキシアルキレンで末端に架橋性シリル基を有する重合体の混合物（カネカ株式会社製「Ｓ９４２」）１００質量部、ビスフェノールＡ型エポキシ樹脂（三菱ケミカル株式会社製「ｊＥＲ８２８」）７質量部、ネオペンチルグリコールジグリシジルエーテル３質量部、表面処理炭酸カルシウム（平均一次粒径０．０８μｍ）２３．５質量部、重質炭酸カルシウム（一次粒径範囲０．２〜４．０μｍ）１００質量部及びガラスバルーン（スリーエムジャパン株式会社製「グラスバブルスＳ２２」）６．５質量部を、プラネタリーミキサーに仕込んで常温減圧下で１時間攪拌した。その後、酸化カルシウム１０質量部、テトラエトキシシラン７質量部及びエポキシシラン化合物である３−グリシドキシプロピルトリメトキシシラン（エボニックジャパン株式会社製「Ｄｙｎａｓｙｌａｎ−ＧＬＹＭＯ」）１３質量部を加え、均一に混合しＡ剤を得た。
Example 1
[Preparation of agent A]
A mixture of a polymer whose main chain is a polyacrylic acid ester and has a crosslinkable silyl group at the terminal or side chain and a polymer whose main chain is polyoxyalkylene and which has a crosslinkable silyl group at the end (“S942” manufactured by Kaneka Co., Ltd.). 100 parts by mass, 7 parts by mass of bisphenol A type epoxy resin (“jER828” manufactured by Mitsubishi Chemical Co., Ltd.), 3 parts by mass of neopentyl glycol diglycidyl ether, surface-treated calcium carbonate (average primary particle size 0.08 μm) 23.5 mass A part, 100 parts by mass of heavy calcium carbonate (primary particle size range 0.2 to 4.0 μm) and 6.5 parts by mass of a glass balloon (“Glass Bubbles S22” manufactured by 3M Japan Co., Ltd.) were charged into a planetary mixer. The mixture was stirred at room temperature and reduced pressure for 1 hour. Then, 10 parts by mass of calcium oxide, 7 parts by mass of tetraethoxysilane, and 13 parts by mass of 3-glycidoxypropyltrimethoxysilane (“Dynasylan-GLYMO” manufactured by Ebonic Japan Co., Ltd.), which is an epoxysilane compound, are added and mixed uniformly. Calcium A was obtained.
［Ｂ剤の準備］
アクリル系可塑剤（東亜合成株式会社製「ＡＲＵＦＯＮ ＵＰ−１０００」）１０質量部及び表面処理炭酸カルシウム（平均一次粒径０．０８μｍ）２３．５質量部を、プラネタリーミキサーに仕込んで、減圧下１１０℃で１時間脱水を行った。その後、アミノシラン化合物であるＮ−２−（アミノエチル）−３−アミノプロピルメチルジメトキシシラン（信越化学工業株式会社製「ＫＢＭ ６０２」）２質量部、エポキシ樹脂の硬化剤であるところのケチミン化合物（イソホロンジアミンとメチルイソブチルケトンの脱水縮合物）５質量部及び架橋性シリル基を有する硬化性樹脂の硬化触媒であるところのジブチル錫１．５質量部を加え、均一に混合しＢ剤を得た。
[Preparation of agent B]
10 parts by mass of acrylic plasticizer (“ARUFON UP-1000” manufactured by Toagosei Co., Ltd.) and 23.5 parts by mass of surface-treated calcium carbonate (average primary particle size 0.08 μm) were charged into a planetary mixer and reduced under reduced pressure. Dehydration was performed at 110 ° C. for 1 hour. After that, 2 parts by mass of N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane ("KBM 602" manufactured by Shin-Etsu Chemical Industry Co., Ltd.), which is an aminosilane compound, and a ketimine compound which is a curing agent for an epoxy resin ( 5 parts by mass of dehydration condensate of isophorone diamine and methyl isobutyl ketone) and 1.5 parts by mass of dibutyltin, which is a curing catalyst for a curable resin having a crosslinkable silyl group, were added and mixed uniformly to obtain Agent B. ..
上記準備したＡ剤とＢ剤を組み合わせ、二液型の接着樹脂キットを得た。 A two-component adhesive resin kit was obtained by combining the above-prepared agents A and B.
実施例２
Ｂ剤を準備する際に、アミノシラン化合物であるＮ−２−（アミノエチル）−３−アミノプロピルメチルジメトキシシラン（信越化学工業株式会社製「ＫＢＭ ６０２」）の添加量を４質量部に変更する他は、実施例１と同一の方法で接着樹脂キットを得た。
Example 2
When preparing Agent B, the amount of the aminosilane compound N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane (“KBM 602” manufactured by Shin-Etsu Chemical Co., Ltd.) is changed to 4 parts by mass. Other than that, an adhesive resin kit was obtained by the same method as in Example 1.
実施例３
Ｂ剤を準備する際に、アミノシラン化合物であるＮ−２−（アミノエチル）−３−アミノプロピルメチルジメトキシシラン（信越化学工業株式会社製「ＫＢＭ ６０２」）の添加量を６質量部に変更する他は、実施例１と同一の方法で接着樹脂キットを得た。
Example 3
When preparing Agent B, the amount of the aminosilane compound N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane (“KBM 602” manufactured by Shin-Etsu Chemical Co., Ltd.) is changed to 6 parts by mass. Other than that, an adhesive resin kit was obtained by the same method as in Example 1.
実施例４
Ｂ剤を準備する際に、アミノシラン化合物であるＮ−２−（アミノエチル）−３−アミノプロピルメチルジメトキシシラン（信越化学工業株式会社製「ＫＢＭ ６０２」）２質量部に代えて、アミノシラン化合物であるＮ−２−（アミノエチル）−３−アミノプロピルメチルトリメトキシシラン（信越化学工業株式会社製「ＫＢＭ ６０３」）４質量部を採用する他は、実施例１と同一の方法で接着樹脂キットを得た。
Example 4
When preparing agent B, use an aminosilane compound instead of 2 parts by mass of the aminosilane compound N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane (“KBM 602” manufactured by Shin-Etsu Chemical Industry Co., Ltd.). Adhesive resin kit in the same manner as in Example 1 except that 4 parts by mass of a certain N-2- (aminoethyl) -3-aminopropylmethyltrimethoxysilane (“KBM 603” manufactured by Shin-Etsu Chemical Industry Co., Ltd.) is adopted. Got
実施例５
Ｂ剤を準備する際に、アミノシラン化合物であるＮ−２−（アミノエチル）−３−アミノプロピルメチルジメトキシシラン（信越化学工業株式会社製「ＫＢＭ ６０２」）２質量部に代えて、アミノシラン化合物である３−アミノプロピルトリメトキシシラン（信越化学工業株式会社製「ＫＢＭ ９０３」）４．５質量部を採用する他は、実施例１と同一の方法で接着樹脂キットを得た。
Example 5
When preparing agent B, use an aminosilane compound instead of 2 parts by mass of the aminosilane compound N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane (“KBM 602” manufactured by Shin-Etsu Chemical Co., Ltd.). An adhesive resin kit was obtained in the same manner as in Example 1 except that 4.5 parts by mass of a certain 3-aminopropyltrimethoxysilane (“KBM 903” manufactured by Shin-Etsu Chemical Co., Ltd.) was adopted.
実施例６
Ｂ剤を準備する際に、アミノシラン化合物であるＮ−２−（アミノエチル）−３−アミノプロピルメチルジメトキシシラン（信越化学工業株式会社製「ＫＢＭ ６０２」）２質量部に代えて、ケチミンシラン化合物である３−トリメトキシシリル−Ｎ−（１，３−ジメチルブチリデン）プロピルアミンの加水分解縮合物（信越化学工業株式会社製「ＫＢＭ ９１０３」）７．５質量部を採用する他は、実施例１と同一の方法で接着樹脂キットを得た。
Example 6
When preparing agent B, use a ketimine silane compound instead of 2 parts by mass of the aminosilane compound N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane (“KBM 602” manufactured by Shin-Etsu Chemical Industry Co., Ltd.). Examples except that 7.5 parts by mass of a hydrolyzed condensate of 3-trimethoxysilyl-N- (1,3-dimethylbutylidene) propylamine (“KBM 9103” manufactured by Shinetsu Chemical Industry Co., Ltd.) is adopted. An adhesive resin kit was obtained in the same manner as in 1.
比較例１
Ｂ剤を準備する際に、アミノシラン化合物であるＮ−２−（アミノエチル）−３−アミノプロピルメチルジメトキシシラン（信越化学工業株式会社製「ＫＢＭ ６０２」）を添加しない他は、実施例１と同一の方法で接着樹脂キットを得た。
Comparative Example 1
Example 1 and Example 1 except that N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane (“KBM 602” manufactured by Shin-Etsu Chemical Co., Ltd.), which is an aminosilane compound, is not added when the agent B is prepared. An adhesive resin kit was obtained by the same method.
［引張接着強さの測定］
縦１５０ｍｍ、横７０ｍｍ及び厚さ１０ｍｍのモルタルを被着体として準備した。この被着体表面にプライマー（コニシ株式会社製「ボンド ＶＭプライマー」）を塗布し、２３℃の環境下で４時間放置して、被着体表面に１００ｇ／ｍ2のプライマー層を形成した。一方、実施例１〜６及び比較例１で得られた接着樹脂キットのＡ剤とＢ剤を均一に混合し、接着樹脂組成物を得た。被着体のプライマー層上に、この接着樹脂組成物の塗布量が０．５ｋｇ／ｍ2となるように塗布し、次いで網状シートであるビニロン製２軸メッシュシート（コニシ株式会社製「ボンド スクエアネット」）を貼着し、続けて網状シート上から上記接着樹脂組成物の塗布量が０．７ｋｇ／ｍ2となるように塗布した。そして、温度５０℃で湿度９５％の雰囲気下で２４時間養生し、被着体の表面が硬化接着樹脂で被覆された試験片を得た。
被着体に形成された硬化接着樹脂の引張接着強さ（Ｎ／ｍｍ2）を、日本建築仕上学会認定の現場用引張試験機（サンコーテクノ株式会社製「テクノテスター（登録商標）ＲＴ−２０００ＬＤII」）を用いて測定した。
この結果を表１に示した。
[Measurement of tensile adhesive strength]
A mortar having a length of 150 mm, a width of 70 mm and a thickness of 10 mm was prepared as an adherend. A primer (“Bond VM Primer” manufactured by Konishi Co., Ltd.) was applied to the surface of the adherend and left to stand in an environment of 23 ° C. for 4 hours to form a primer layer of 100 g / m 2 on the surface of the adherend. On the other hand, Agents A and B of the adhesive resin kits obtained in Examples 1 to 6 and Comparative Example 1 were uniformly mixed to obtain an adhesive resin composition. This adhesive resin composition is applied onto the primer layer of the adherend so that the coating amount is 0.5 kg / m 2, and then a net-like sheet, a biaxial mesh sheet made of Viniron (“Bond Square” manufactured by Konishi Co., Ltd.). The net ") was attached, and subsequently, the adhesive resin composition was applied from the net-like sheet so that the amount of the adhesive resin composition applied was 0.7 kg / m 2 . Then, it was cured for 24 hours in an atmosphere of a temperature of 50 ° C. and a humidity of 95% to obtain a test piece in which the surface of the adherend was coated with a cured adhesive resin.
The tensile adhesive strength (N / mm 2 ) of the cured adhesive resin formed on the adherend is measured by the on-site tensile tester certified by the Japan Society for Building Finishing (Sanko Techno Co., Ltd. "Techno Tester (registered trademark) RT-2000LDII". ”) Was measured.
The results are shown in Table 1.
［表１］
━━━━━━━━━━━━━━━━━━━━━━
引張接着強さ（Ｎ／ｍｍ2）
━━━━━━━━━━━━━━━━━━━━━━
実施例１ １．５８
実施例２ １．８３
実施例３ ２．３２
実施例４ １．８０
実施例５ １．７６
実施例６ １．７４
比較例１ １．３９
━━━━━━━━━━━━━━━━━━━━━━
[Table 1]
━━━━━━━━━━━━━━━━━━━━━━
Tension adhesive strength (N / mm 2 )
━━━━━━━━━━━━━━━━━━━━━━
Example 1 1.58
Example 2 1.83
Example 3 2.32
Example 4 1.80
Example 5 1.76
Example 6 1.74
Comparative Example 1 1.39
━━━━━━━━━━━━━━━━━━━━━━
表１に結果から分かるように、実施例１〜６の接着樹脂キットを用いて得られた硬化接着樹脂は、比較例１の接着樹脂キットを用いた得られた硬化接着樹脂に比べて、引張接着強さが高くなっている。 As can be seen from the results in Table 1, the cured adhesive resin obtained by using the adhesive resin kits of Examples 1 to 6 is more tensile than the cured adhesive resin obtained by using the adhesive resin kit of Comparative Example 1. Adhesive strength is high.
Claims (6)
前記接着樹脂組成物が、架橋性シリル基を有する硬化性樹脂とエポキシ樹脂とアミノシラン化合物又はケチミンシラン化合物を含んでいることを特徴とするコンクリート片の剥落防止工法。 In the first step of applying the adhesive resin composition to the surface side of the concrete skeleton, the second step of attaching a net-like sheet on the adhesive resin composition applied in the first step, and the second step. In the method for preventing the peeling of concrete pieces, which comprises the third step of applying the adhesive resin composition on the attached net-like sheet,
A method for preventing peeling of concrete pieces, wherein the adhesive resin composition contains a curable resin having a crosslinkable silyl group, an epoxy resin, an aminosilane compound or a ketiminesilane compound.
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