JP4825711B2 - Repair method of water shielding sheet made of thermoplastic resin - Google Patents
Repair method of water shielding sheet made of thermoplastic resin Download PDFInfo
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- JP4825711B2 JP4825711B2 JP2007070987A JP2007070987A JP4825711B2 JP 4825711 B2 JP4825711 B2 JP 4825711B2 JP 2007070987 A JP2007070987 A JP 2007070987A JP 2007070987 A JP2007070987 A JP 2007070987A JP 4825711 B2 JP4825711 B2 JP 4825711B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Description
本発明は、溜池、景勝池、海岸護岸、海岸廃棄物処分場等の底面又は法面等に敷設された熱可塑性樹脂製遮水シートの接合部や施工中等に生じた熱可塑性樹脂製遮水シートの破損箇所を水中において補修する方法、すなわち、熱可塑性樹脂製遮水シートの補修方法に関するものである。 The present invention relates to a thermoplastic resin impermeable sheet formed during the construction of a junction or construction of a thermoplastic resin impermeable sheet laid on the bottom or slope of a reservoir, scenic pond, coastal revetment, coastal waste disposal site, etc. The present invention relates to a method for repairing a damaged portion of a sheet in water, that is, a method for repairing a thermoplastic resin water shielding sheet.
従来、廃棄物処分場、溜池、貯水池、河川の堤防部等の土木工事においては、大地を掘って広大な凹地を設け、その底面又は法面に熱可塑性樹脂製遮水シートを敷設することが行われている。 Conventionally, in civil engineering works such as waste disposal sites, reservoirs, reservoirs, river dikes, etc., it is possible to dig the ground and provide a vast depression, and lay a thermoplastic resin impermeable sheet on the bottom or slope. Has been done.
それらの中で、特に廃棄物処分場については、公害問題、環境汚染問題等の点から内陸部に設けることが難しくなり、そのため海岸線等を利用して海岸に大掛かりな廃棄物処分場を設けることが多くなっている。そして、その施工方法としては、工事船の上で広幅の熱可塑性樹脂製遮水シートを溶着しながら接合して、これを海底に敷設する方法が一般に採られる。その際の熱可塑性樹脂製遮水シート接合箇所の溶着強度が不十分な場合や、熱可塑性樹脂製遮水シートを敷設した海底の凹凸部分及び廃棄物の突起物等によって熱可塑性樹脂製遮水シートに破損箇所が生じた場合、廃棄物処分場内の廃棄物中の有害物質がそれらの箇所から漏洩して海洋汚染が発生するという問題を起こすことになる。 Among them, especially for waste disposal sites, it becomes difficult to establish inland areas from the viewpoint of pollution problems, environmental pollution problems, etc. Therefore, a large waste disposal site should be established on the coast using the coastline etc. Is increasing. And as the construction method, a method is generally adopted in which a wide thermoplastic resin impermeable sheet is joined on a construction ship while welding and laid on the seabed. In this case, if the welding strength of the thermoplastic resin impermeable sheet joint is insufficient, or if the thermoplastic resin impermeable sheet is laid on the sea floor uneven surface and waste projections, etc. When damaged parts occur in the sheet, harmful substances in the waste in the waste disposal site will leak from those parts, causing a problem of marine pollution.
従来、熱可塑性樹脂製遮水シートに損傷部等の補修箇所が発見された場合、当該シートを水中から引き上げて、工事船上で当該損傷部等の溶着補修を行わねばならず、多大な労力と時間を費やさなければならなかった。 Conventionally, when a repaired part such as a damaged part is found in a thermoplastic resin impermeable sheet, it is necessary to lift the sheet from the water and repair the damaged part on the construction ship, which requires a great deal of labor. Had to spend time.
この問題点を解決する方法として、水中の基礎地盤上に敷設された熱可塑性樹脂製遮水シートの破損箇所を高密度ベントナイトマットで上下から挟み、その上からコンクリート板等の重石を設置して高密度ベントナイトを熱可塑性樹脂製遮水シートに圧着させる、水中又は海水中における遮水シートの補修方法が提案されている（特許文献１参照）。
しかしながら、上記のような従来の補修方法では、特殊なマットを使用しなければならず、しかも大掛かりであり、作業性に劣るという問題があり、そのため、そうした問題を解決した水中での補修方法が求められていた。
従って、本発明は、熱可塑性樹脂製遮水シートの補修箇所を水中から引き上げることなく、水中において容易に補修することができる、作業性に優れた熱可塑性樹脂製遮水シートの補修方法を提供することを課題とする。
However, in the conventional repair method as described above, a special mat must be used, and there is a problem that it is large-scale and inferior in workability. Therefore, there is a repair method in water that solves such a problem. It was sought after.
Accordingly, the present invention provides a method for repairing a water-insulating sheet made of a thermoplastic resin that has excellent workability and can be easily repaired in water without pulling up the repaired portion of the water-insulating sheet made of thermoplastic resin from the water. The task is to do.
本発明者は、上記課題を鋭意検討した結果、特定の接合剤を補修箇所に塗布し、そして、所定の熱可塑性樹脂製遮水シートをその塗布面に積層、圧着して接合剤を硬化させる方法を見出し、本発明を完成するに至った。
すなわち、本発明は、無機充填剤を含有する熱可塑性樹脂製遮水シートの補修箇所に当該無機充填剤と反応する接合剤を水中で塗布し、次いで、当該接合剤の塗布面に無機充填剤を含有する補修用熱可塑性樹脂製遮水シートを水中で積層し、その後、水中で当該補修用熱可塑性樹脂製遮水シートを上記接合剤の塗布面に圧着して当該接合剤を硬化させることを特徴とする熱可塑性樹脂製遮水シートの補修方法である。
As a result of earnestly examining the above problems, the present inventor applied a specific bonding agent to the repaired portion, and laminated and pressure-bonded a predetermined thermoplastic resin water shielding sheet on the application surface to cure the bonding agent. The method has been found and the present invention has been completed.
That is, in the present invention, a bonding agent that reacts with the inorganic filler is applied in water to the repaired portion of the thermoplastic resin water shielding sheet containing the inorganic filler, and then the inorganic filler is applied to the application surface of the bonding agent. A repairing thermoplastic resin impermeable sheet containing water, and then pressing the repairing thermoplastic resin impermeable sheet on the application surface of the bonding agent in water to cure the bonding agent This is a method for repairing a water shielding sheet made of thermoplastic resin.
本発明の熱可塑性樹脂製遮水シートの補修方法によれば、熱可塑性樹脂製遮水シートを水中から引き上げることなく、熱可塑性樹脂製遮水シートを潜水させた状態（水環境）で容易に補修作業をすることが可能となるため、補修作業の作業性を大幅に向上させることができ、しかも熱可塑性樹脂製遮水シートを船上等に引き上げて行う従来の補修作業の場合と同等の補修接合強度を得ることができる。 According to the method of repairing a thermoplastic resin impermeable sheet of the present invention, the thermoplastic resin impermeable sheet can be easily submerged without being pulled out of the water (water environment). Since it is possible to perform repair work, the workability of the repair work can be greatly improved, and the same repair as in the case of conventional repair work that is performed by pulling up the water shielding sheet made of thermoplastic resin on the ship etc. Bonding strength can be obtained.
本発明の熱可塑性樹脂製遮水シートの補修方法について、以下、詳細に説明する。本発明の補修方法は、まず、無機充填剤を含有する熱可塑性樹脂製遮水シートの補修箇所に当該無機充填剤と反応する接合剤を水中で塗布する。したがって、本発明の補修方法は、所定の無機充填剤を含有する熱可塑性樹脂製遮水シートが補修の対象となる。
無機充填剤を含有する熱可塑性樹脂製遮水シートを構成する熱可塑性樹脂としては、軟質ポリ塩化ビニル系樹脂；ポリエチレン樹脂、高密度ポリエチレン、メタロセン触媒ポリエチレン等のポリエチレン系樹脂；エチレン−酢酸ビニル共重合体系樹脂；エチレン−プロピレン共重合体系樹脂；ポリウレタン系樹脂等が例示される。この例示された中では、軟質ポリ塩化ビニル系樹脂が好ましい。
The method for repairing the thermoplastic resin water shielding sheet of the present invention will be described in detail below. In the repairing method of the present invention, first, a bonding agent that reacts with the inorganic filler is applied in water to the repaired portion of the water shielding sheet made of thermoplastic resin containing the inorganic filler. Therefore, in the repair method of the present invention, the thermoplastic resin water-impervious sheet containing a predetermined inorganic filler is the object of repair.
The thermoplastic resin constituting the thermoplastic resin water shielding sheet containing an inorganic filler includes soft polyvinyl chloride resin; polyethylene resins such as polyethylene resin, high-density polyethylene, and metallocene-catalyzed polyethylene; Examples include polymer resins; ethylene-propylene copolymer resins; polyurethane resins and the like. Among these exemplified, a soft polyvinyl chloride resin is preferable.
上記熱可塑性樹脂製遮水シートには、後述する接合剤と反応する無機充填剤が含有される。この無機充填剤は補修箇所に塗布される接合剤と反応、接合し、その反応接合効果として十分な剥離強度、引張せん断強度を発揮する。したがって、接合剤と反応する無機充填剤を含有していない熱可塑性樹脂製遮水シートでは、十分な接合強度を得ることはできない。 The thermoplastic resin water-impervious sheet contains an inorganic filler that reacts with a bonding agent described later. This inorganic filler reacts and bonds with the bonding agent applied to the repair site, and exhibits sufficient peel strength and tensile shear strength as its reactive bonding effect. Therefore, sufficient bonding strength cannot be obtained with a water-impervious sheet made of thermoplastic resin that does not contain an inorganic filler that reacts with the bonding agent.
そのような反応接合効果が得られる好適な無機充填剤としては、シリカ、赤リン、ホウ酸亜鉛、タルク、マイカ、クレー、カオリン、ベントナイト、合成雲母、炭酸カルシウム、バライト、ケイ酸ジルコニウム等が例示される。これらは１種又は２種以上を含有させることができる。使用する接合剤の種類に応じて無機充填剤の種類、配合量等を適宜変更することにより、所望する接合強度とすることができる。 Examples of suitable inorganic fillers that can provide such a reactive bonding effect include silica, red phosphorus, zinc borate, talc, mica, clay, kaolin, bentonite, synthetic mica, calcium carbonate, barite, zirconium silicate, etc. Is done. These can contain 1 type (s) or 2 or more types. A desired bonding strength can be obtained by appropriately changing the type, blending amount, and the like of the inorganic filler according to the type of the bonding agent to be used.
熱可塑性樹脂製遮水シート中における無機充填剤の含有量は、当該熱可塑性樹脂製遮水シートの総重量に対して、５〜６０質量％とすることが好ましく、特には１０〜４０質量％が好ましい。この含有量が５質量％未満であると、１）．接合剤との反応接合効果が十分に得られなくなり、その結果、補修箇所における十分な剥離強度及び引張せん断強度を得ることが困難となる、２）．熱可塑性樹脂製遮水シートの比重が低くなり、熱可塑性樹脂製遮水シートの水中での沈降安定性が損なわれる場合がある、という問題が生じる。逆に無機充填剤の含有量が６０質量％を超えると熱可塑性樹脂製遮水シートの遮水効果が低減したり、熱可塑性樹脂製遮水シートの柔軟性が損なわれる場合がある、という問題が生じる。 The content of the inorganic filler in the thermoplastic resin impermeable sheet is preferably 5 to 60% by mass, particularly 10 to 40% by mass, based on the total weight of the thermoplastic resin impermeable sheet. Is preferred. When this content is less than 5% by mass, 1). The reaction bonding effect with the bonding agent cannot be sufficiently obtained, and as a result, it becomes difficult to obtain sufficient peel strength and tensile shear strength at the repaired place 2). The specific gravity of the thermoplastic resin water-impervious sheet becomes low, and there arises a problem that the sedimentation stability of the thermoplastic resin impermeable sheet in water may be impaired. Conversely, if the content of the inorganic filler exceeds 60% by mass, the water shielding effect of the thermoplastic resin impermeable sheet may be reduced, or the flexibility of the thermoplastic resin impermeable sheet may be impaired. Occurs.
本発明の補修方法は、上記したように、熱可塑性樹脂製遮水シートの補修箇所に無機充填剤と反応する接合剤を水中で塗布することから、当該接合剤は水中において沈降性及び非拡散性を備えたものであることが必要である。そのためには、当該接合剤は１以上の比重（１．０５〜１．５の比重を有するものが入手容易である）を有し、水中において硬化する前にゲル状又はペースト状で非拡散状態を保持できることが要求される。なお、本発明において、水中とは、熱可塑性樹脂製遮水シートが使用される全ての場所における水環境を総称する意味であり、また、海水中、淡水中の別は問わない。 In the repair method of the present invention, as described above, since the bonding agent that reacts with the inorganic filler is applied in water to the repaired portion of the thermoplastic resin waterproof sheet, the bonding agent is settled and non-diffusible in water. It is necessary to have the nature. For this purpose, the bonding agent has a specific gravity of 1 or more (a material having a specific gravity of 1.05 to 1.5 is easily available) and is in a gel-like or paste-like, non-diffusion state before being cured in water. It is required to be able to hold In addition, in this invention, underwater means the water environment in all the places where the thermoplastic resin water-impervious sheet is used, and it does not matter whether it is in seawater or freshwater.
本発明において使用される上記接合剤は、水中で熱可塑性樹脂製遮水シートに含有される無機充填剤と反応して硬化するタイプのものであることも要求される。本発明では、以上述べた要件を満たす各種接着剤等を広く使用することができるが、水中での接合作業を簡便にするために一液型タイプの接着剤が特に好ましい。また、反応硬化後に接着剤等の硬化部層が弾性を有する接着剤等を用いることが好ましい。接着剤等の硬化部層が弾性を有することにより、接合部の引張せん断伸びが向上し、接合部の接合強度が向上する。
このような接合剤の具体例としては、反応性変性シリコーン系硬化型接着剤、反応性変性アクリル系硬化型接着剤、反応性変性ウレタン系硬化型接着剤等が挙げられる。これらの接着剤は水中で水分と反応して硬化し、無機充填剤を介して熱可塑性樹脂製遮水シートと接合する。
The bonding agent used in the present invention is also required to be of a type that cures by reacting with an inorganic filler contained in a thermoplastic resin impermeable sheet in water. In the present invention, various adhesives satisfying the above-mentioned requirements can be widely used, but a one-pack type adhesive is particularly preferable in order to simplify the joining operation in water. Moreover, it is preferable to use an adhesive or the like in which the cured portion layer such as an adhesive has elasticity after reaction curing. When the hardened layer such as an adhesive has elasticity, the tensile shear elongation of the joint is improved, and the joint strength of the joint is improved.
Specific examples of such a bonding agent include a reactive-modified silicone-based curable adhesive, a reactive-modified acrylic-based curable adhesive, and a reactive-modified urethane-based curable adhesive. These adhesives are cured by reacting with moisture in water, and bonded to a thermoplastic resin waterproof sheet through an inorganic filler.
上記反応性変性シリコーン系硬化型接着剤は、主成分として反応性シリコーン、アクリル変性シリコーン等を必須成分として含有する硬化性組成物等である。この反応性シリコーンとは、シロキサン結合を形成することによって架橋し得るシリル基を有するシリコーンである。
反応性変性シリコーン系硬化型接着剤の市販品としては、スーパーＸ［セメダイン社製商品名］、スーパーシール［セメダイン社製商品名］等が挙げられる。
The reactive-modified silicone-based curable adhesive is a curable composition containing, as a main component, reactive silicone, acrylic-modified silicone or the like as an essential component. The reactive silicone is a silicone having a silyl group that can be crosslinked by forming a siloxane bond.
Examples of commercially available reactive-modified silicone-based curable adhesives include Super X [trade name, manufactured by Cemedine], Super Seal [trade name, manufactured by Cemedine], and the like.
反応性変性アクリル系硬化型接着剤は、メタクリレートモノマーにジエン系合成ゴムを溶かした溶液と活性剤とからなる非混合系、あるいはメタクリルモノマーに同質のポリマーを溶かした溶液と有機過酸化物触媒とからなるラジカル重合系等の接着剤である。
反応性変性アクリル系硬化型接着剤の市販品としては、スーパーＸＧ［セメダイン社製商品名］、Ｙ６２０［セメダイン社製商品名］、Ｙ６３００［セメダイン社製商品名］等が挙げられる。
A reactive modified acrylic curable adhesive is a non-mixed system consisting of a solution of a diene synthetic rubber in a methacrylate monomer and an activator, or a solution of a homogeneous polymer in a methacrylic monomer and an organic peroxide catalyst. It is an adhesive such as a radical polymerization system.
Examples of commercially available reactive-modified acrylic curable adhesives include Super XG [trade name, manufactured by Cemedine], Y620 [trade name, manufactured by Cemedine], Y6300 [trade name, manufactured by Cemedine], and the like.
反応性変性ウレタン系硬化型接着剤は、分子中に含まれるイソシアネート基及び反応性シリル基等の反応性を利用した接着剤である。反応性変性ウレタン系硬化型接着剤の市販品としては、ボンドウルトラ多用途ＳＵ［コニシ社製商品名］等が挙げられる。 The reactive modified urethane-based curable adhesive is an adhesive utilizing reactivity such as isocyanate group and reactive silyl group contained in the molecule. Examples of commercially available reactive-modified urethane-based curable adhesives include Bond Ultra Versatile SU [trade name, manufactured by Konishi Co., Ltd.].
熱可塑性樹脂製遮水シートの補修箇所に塗布される接合剤の塗布量は、特に限定されるものではなく、接合剤や充填剤等の種類、補修箇所の破損程度等に応じて適宜決定すればよいが、通常、接合剤の塗布面積当たり、１５０〜１３００ｇ／ｍ2程度である。この範囲にすると、接合剤硬化後の硬化部層の厚さが約０．２〜２ｍｍ程度となり、安定した接合性能を得ることができる。 The amount of the bonding agent applied to the repaired portion of the thermoplastic resin water shielding sheet is not particularly limited, and may be appropriately determined according to the type of the bonding agent or filler, the degree of damage to the repaired portion, etc. Usually, it is about 150 to 1300 g / m 2 per application area of the bonding agent. When it is in this range, the thickness of the cured portion layer after curing of the bonding agent is about 0.2 to 2 mm, and stable bonding performance can be obtained.
本発明においては、熱可塑性樹脂製遮水シートの補修箇所に接合剤を塗布する場合、接合剤にガラスクロスを加えて塗布することができる。例えば、熱可塑性樹脂製遮水シートの補修箇所に接合剤を水中で塗布した後、その塗布面上にガラスクロスを積層し、さらに、当該ガラスクロス上に接合剤を塗布する。これにより、接合剤硬化後の硬化部層中にガラスクロスを埋め込まれることになり、その結果、熱可塑性樹脂製遮水シートが海底面にあって局部的な凹凸傾斜のある環境にある場合、熱可塑性樹脂製遮水シートの補修箇所の損傷部が開いている場合、補修用熱可塑性樹脂製遮水シートの積層箇所が開いた場合等において、塗布された接合剤の流動タレ偏りを防止する効果が得られ、接合部の接合強度の向上、補修箇所に塗布された接合剤の層厚の均一化、及び圧着させる際にかかる荷重の均一化を図ることができる。
上記ガラスクロスとしては、特に限定されるものではなく、例えば、厚さ０．２ｍｍ、太さ０．１ｍｍ、目開き３〜５ｍｍ角大の平織り又はカラミ織りタイプ等のものが挙げられる。
In this invention, when apply | coating a bonding agent to the repair location of a thermoplastic resin water shielding sheet, it can apply | coat by adding a glass cloth to a bonding agent. For example, after applying a bonding agent in water to a repaired portion of a thermoplastic resin impermeable sheet, a glass cloth is laminated on the application surface, and the bonding agent is further applied on the glass cloth. As a result, the glass cloth is embedded in the cured portion layer after the bonding agent is cured, and as a result, when the thermoplastic resin impermeable sheet is on the sea bottom and is in an environment with local uneven inclination, Prevents uneven flow of applied adhesive when the damaged part of the thermoplastic resin impermeable sheet is open or when the repaired thermoplastic resin impermeable sheet is laminated. An effect is acquired and the improvement of the joint strength of a junction part, the uniformity of the layer thickness of the joining agent apply | coated to the repair location, and the equalization | homogenization of the load applied when making it crimping can be aimed at.
The glass cloth is not particularly limited, and examples thereof include a plain weave or calami weave type having a thickness of 0.2 mm, a thickness of 0.1 mm, and a mesh size of 3 to 5 mm.
熱可塑性樹脂製遮水シートの補修箇所に接合剤を水中で塗布した後、当該接合剤の塗布面に無機充填剤を含有する補修用熱可塑性樹脂製遮水シートを水中で積層する。この補修用熱可塑性樹脂製遮水シートは、補修対象である熱可塑性樹脂製遮水シートと同様のものであり、したがって、上記熱可塑性樹脂に上記無機充填剤が配合された材料で構成された熱可塑性樹脂製遮水シートである。ただし、補修用熱可塑性樹脂製遮水シートは、補修箇所を有する熱可塑性樹脂製遮水シートと全く同じ成分組成のものである必要はなく、熱可塑性樹脂、無機充填剤の種類、配合割合等を適宜変更したものとすることができる。 After the bonding agent is applied in water to the repaired portion of the thermoplastic resin impermeable sheet, a repairing thermoplastic resin impermeable sheet containing an inorganic filler is laminated on the application surface of the bonding agent in water. This thermoplastic resin impermeable sheet for repair is the same as the thermoplastic resin impermeable sheet to be repaired, and is therefore composed of a material in which the inorganic filler is blended with the thermoplastic resin. It is a thermoplastic resin water-impervious sheet. However, the thermoplastic resin impermeable sheet for repair need not have the same component composition as that of the thermoplastic resin impermeable sheet having the repaired portion, the kind of thermoplastic resin, inorganic filler, blending ratio, etc. Can be appropriately changed.
補修用熱可塑性樹脂製遮水シートを接合剤の塗布面に積層した後、水中で当該補修用熱可塑性樹脂製遮水シートを上記接合剤の塗布面に圧着して当該接合剤を硬化させる。接合剤の硬化完了まで圧着することにより、補修箇所部分の動きを止め、補修用熱可塑性樹脂製遮水シートとの接合密着性を保持することにより安定した接合を図り、これにより補修箇所が補修用熱可塑性樹脂製遮水シートで被覆されて完全に修復される。 After the repairing thermoplastic resin impermeable sheet is laminated on the bonding agent application surface, the repairing thermoplastic resin impermeable sheet is pressed against the bonding agent application surface in water to cure the bonding agent. By pressing the bonding agent until the curing is complete, the movement of the repaired part is stopped, and stable bonding is achieved by maintaining the bonding adhesiveness with the thermoplastic resin waterproof sheet for repairing, thereby repairing the repaired part. It is completely repaired by being covered with a thermoplastic resin water shielding sheet.
補修用熱可塑性樹脂製遮水シートを上記接合剤の塗布面に圧着して接合剤を硬化させる方法としては、一般には水中で補修用熱可塑性樹脂製遮水シートの積層面上から、薄い鋼板、サンドバック、コンクリートブロック等で荷重をかけて上記接合剤の塗布面に上記シートを圧着（圧締）して接合剤を硬化させる方法等が採られる。補修用熱可塑性樹脂製遮水シートの積層面上に加える荷重は、通常１０〜１５０ｇ／ｃｍ2であり、その荷重負荷時間（接合剤の硬化時間）は通常２０〜２５０時間である。 As a method of curing the bonding agent by pressing a repairing thermoplastic resin impermeable sheet on the surface to which the bonding agent is applied, a thin steel plate is generally used in water from the laminated surface of the repairing thermoplastic resin impermeable sheet. For example, a method may be employed in which a load is applied with a sandbag, a concrete block, or the like, and the sheet is pressure-bonded (pressed) to the application surface of the bonding agent to cure the bonding agent. The load applied to the laminated surface of the thermoplastic resin impermeable sheet for repair is usually 10 to 150 g / cm 2 , and the load time (setting time of the bonding agent) is usually 20 to 250 hours.
本発明の熱可塑性樹脂製遮水シートの補修方法によれば、熱可塑性樹脂製遮水シートと補修用熱可塑性樹脂製遮水シートを、接合剤を用いて水中で接着させることにより、補修部分を有する熱可塑性樹脂製遮水シートを水中から引き上げることなく、熱可塑性樹脂製遮水シートを水中に潜水させたままの状態（水環境）で熱可塑性樹脂製遮水シートを補修することが可能となる。また、上記補修方法を行うことにより、後述する実施例で示したように、補修後の熱可塑性樹脂製遮水シートの補修箇所における引張せん断強度を当該熱可塑性樹脂製遮水シートの引張せん断強度の３０％以上とすることができ、船上等の陸環境での補修作業の場合と同等の補修接合強度を得ることができる。 According to the method for repairing a thermoplastic resin impermeable sheet of the present invention, a thermoplastic resin impermeable sheet and a repairing thermoplastic resin impermeable sheet are bonded in water using a bonding agent, thereby repairing the repair portion. It is possible to repair the thermoplastic resin impermeable sheet while the thermoplastic resin impermeable sheet is submerged in the water (water environment) without lifting the thermoplastic resin impermeable sheet from the water. It becomes. In addition, by performing the above repair method, as shown in the examples described later, the tensile shear strength at the repair location of the thermoplastic resin impermeable sheet after the repair is the tensile shear strength of the thermoplastic resin impermeable sheet. Therefore, it is possible to obtain a repair joint strength equivalent to that of repair work in a land environment such as on board.
［実施例１〜２］
厚み１．５ｍｍ×縦２００ｍｍ×横２５０ｍｍのＥＰＤＭシートI（エチレン−プロピレン共重合体シート／シリカ１５質量％及び、クレー１５質量％含有）である試験シート６枚を用意した。
試験シート３枚について、試験シートの中央部にカッターナイフで縦３０ｍｍ×横３０ｍｍの十文字の切り裂き込み傷を入れて、切り裂き込み傷試験シートを作製した。（残り３枚の試験シートは補修用シートとした。）
そして、高さ１００ｍｍの位置まで水が入れてある水槽（内寸で縦４２５ｍｍ×横７３０ｍｍ×高さ２１５ｍｍ）の底面に十文字の切り裂き込み傷試験シートを置いた。
[Examples 1-2]
Six test sheets were prepared which were EPDM sheet I (ethylene-propylene copolymer sheet / silica 15% by mass and clay 15% by mass) having a thickness of 1.5 mm × length 200 mm × width 250 mm.
About three test sheets, the cut | judging wound of the crossed letter of 30 mm long x 30 mm wide was put in the center part of the test sheet with the cutter knife, and the cut-off wound test sheet | seat was produced. (The remaining three test sheets were used as repair sheets.)
Then, a cross-cut test sheet having a crossed shape was placed on the bottom surface of a water tank (inside dimensions: vertical 425 mm × horizontal 730 mm × height 215 mm) in which water was introduced up to a height of 100 mm.
次に、切り裂き込み傷試験シートの十文字傷を中心に縦１００ｍｍ×横１００ｍｍの広さで、以下に示した種類の接着剤を水中で塗布（塗布量５００ｇ／ｍ2）した。
次に、接着剤の塗布面に上記ＥＰＤＭシートである補修用シートを積層し、積層面上より押え用板として小鉄板（厚さ０．３ｍｍ×縦１２０ｍｍ×横２５０ｍｍ、重量０．７ｋｇ）を置いて、さらに小鉄板上にコンクリートブロック（３００ｍｍΦ×高さ８０ｍｍ、１０ｋｇ）を載せて、荷重をかけて放置した。
７２時間放置後、補修用シートが接合した切り裂き込み傷試験シートを取り出し、剥離強度評価試験を行い、その結果を表１に示した。
Next, an adhesive of the type shown below was applied in water (applied amount: 500 g / m 2 ) with a width of 100 mm × 100 mm in width centering on the cross-shaped scratches on the tearing test sheet.
Next, a repair sheet, which is the EPDM sheet, is laminated on the adhesive application surface, and a small iron plate (thickness 0.3 mm × length 120 mm × width 250 mm, weight 0.7 kg) is used as a presser plate from the lamination surface. Then, a concrete block (300 mmΦ × height 80 mm, 10 kg) was further placed on the small iron plate and left under a load.
After leaving for 72 hours, the tear test sheet to which the repair sheet was bonded was taken out and subjected to a peel strength evaluation test. The results are shown in Table 1.
［接合剤］
１．変性シリコーン系接着剤 ：スーパーＸ［セメダイン社製商品名］
比重１．３ｇ／ｃｍ3
２．シリル化ウレタン系接着剤：ウルトラ多目的ＳＵ［コニシ社製商品
名］、比重１．１０ｇ／ｃｍ3
[Bonding agent]
1. Modified silicone adhesive: Super X [trade name, manufactured by Cemedine]
Specific gravity 1.3g / cm 3
2. Silylated urethane adhesives: Ultra multipurpose SU [KONISHI products
Name], specific gravity 1.10 g / cm 3
［剥離強度評価試験］
ＪＩＳ Ｋ−６８５０に準じて剥離強度（直角剥離）試験を行い、その測定結果を下記に示した基準で評価した。
［評価基準］
Ａ：３Ｎ／ｃｍ以上
Ｂ：１．５Ｎ／ｃｍ以上３Ｎ／ｃｍ未満
Ｃ：０．２Ｎ／ｃｍ以上１．５Ｎ／ｃｍ未満
Ｄ：０．２Ｎ／ｃｍ未満
[Peel strength evaluation test]
A peel strength (right angle peel) test was performed according to JIS K-6850, and the measurement results were evaluated according to the criteria shown below.
[Evaluation criteria]
A: 3 N / cm or more B: 1.5 N / cm or more and less than 3 N / cm C: 0.2 N / cm or more and less than 1.5 N / cm D: Less than 0.2 N / cm
［実施例３〜４］
実施例１〜２において、ＥＰＤＭシートIの代わりにＴＰＯシートI（高密度ポリエチレン樹脂とエチレン−プロピレン共重合体との混合シート／シリカ１６質量％及び、タルク２０質量％含有）を用いた以外は、それぞれ実施例１〜２と同様にして処理を行い、剥離強度評価試験を行った。その結果を表２に示した。
[Examples 3 to 4]
In Examples 1 and 2, TPO sheet I (mixed sheet of high-density polyethylene resin and ethylene-propylene copolymer / containing 16% by mass of silica and 20% by mass of talc) was used in place of EPDM sheet I. Each was processed in the same manner as in Examples 1 and 2, and a peel strength evaluation test was conducted. The results are shown in Table 2.
［実施例５〜６］
実施例１〜２において、ＥＰＤＭシートIの代わりにＭｅＰＥシートI（メタロセン触媒ポリエチレン樹脂シート／タルク１５質量％及び、バライト１０質量％含有）を用いた以外は、それぞれ実施例１〜２と同様にして処理を行い、剥離強度評価試験を行った。その結果を表３に示した。
[Examples 5 to 6]
In Examples 1 and 2, MePE sheet I (metallocene-catalyzed polyethylene resin sheet / 15% by mass of talc and 10% by mass of barite contained) was used instead of EPDM sheet I. The peel strength evaluation test was conducted. The results are shown in Table 3.
［実施例７〜８］
実施例１〜２において、ＥＰＤＭシートIの代わりにＴＰＵシートI（ポリウレタン樹脂シート／シリカ１５質量％及び、炭酸カルシウム１５質量％含有）を用いた以外は、それぞれ実施例１〜２と同様にして処理を行い、剥離強度評価試験を行った。その結果を表４に示した。
[Examples 7 to 8]
In Examples 1 and 2, the same procedure as in Examples 1 and 2 except that TPU sheet I (containing 15% by mass of polyurethane resin sheet / silica and 15% by mass of calcium carbonate) was used instead of EPDM sheet I. The treatment was performed and a peel strength evaluation test was performed. The results are shown in Table 4.
［実施例９〜１０］
実施例１〜２において、ＥＰＤＭシートIの代わりに軟質塩ビシートI（軟質ポリ塩化ビニル樹脂シート／炭酸カルシウム１０質量％及び、クレー１０質量％含有）を用いた以外は、それぞれ実施例１〜２と同様にして処理を行い、剥離強度評価試験を行った。その結果を表５に示した。
[Examples 9 to 10]
In Examples 1-2, Example 1-2 was used except that soft PVC sheet I (soft polyvinyl chloride resin sheet / calcium carbonate 10% by mass and clay 10% by mass) was used instead of EPDM sheet I. In the same manner as described above, a peel strength evaluation test was performed. The results are shown in Table 5.
［比較例１〜２］
実施例１〜２において、ＥＰＤＭシートIの代わりにＥＰＤＭシートII（エチレン−プロピレン共重合体シート／無機充填剤含有量０質量％）を用いた以外は、それぞれ実施例１〜２と同様にして処理を行い、剥離強度評価試験を行った。その結果を表６に示した。
[Comparative Examples 1-2]
In Examples 1-2, the same procedure as in Examples 1-2 was used, except that EPDM sheet II (ethylene-propylene copolymer sheet / inorganic filler content 0 mass%) was used instead of EPDM sheet I. The treatment was performed and a peel strength evaluation test was performed. The results are shown in Table 6.
［比較例３〜４］
実施例１〜２において、ＥＰＤＭシートIの代わりにＴＰＯシートII（高密度ポリエチレン樹脂とエチレン−プロピレン共重合体との混合シート／無機充填剤含有量０質量％）を用いた以外は、それぞれ実施例１〜２と同様にして処理を行い、剥離強度評価試験を行った。その結果を表７に示した。
[Comparative Examples 3 to 4]
In Examples 1 and 2, each was carried out except that TPO sheet II (mixed sheet of high-density polyethylene resin and ethylene-propylene copolymer / inorganic filler content 0 mass%) was used instead of EPDM sheet I. The treatment was performed in the same manner as in Examples 1 and 2, and a peel strength evaluation test was conducted. The results are shown in Table 7.
［比較例５〜６］
実施例１〜２において、ＥＰＤＭシートIの代わりにＭｅＰＥシートII（メタロセン触媒ポリエチレン樹脂シート／無機充填剤含有量０質量％）を用いた以外は、それぞれ実施例１〜２と同様にして処理を行い、剥離強度評価試験を行った。その結果を表８に示した。
[Comparative Examples 5-6]
In Examples 1-2, the treatment was performed in the same manner as in Examples 1-2, except that MePE sheet II (metallocene catalyst polyethylene resin sheet / inorganic filler content 0 mass%) was used instead of EPDM sheet I. The peel strength evaluation test was conducted. The results are shown in Table 8.
［比較例７〜８］
実施例１〜２において、ＥＰＤＭシートIの代わりにＴＰＵシートII（ポリウレタン樹脂シート／無機充填剤含有量０質量％）を用いた以外は、それぞれ実施例１〜２と同様にして処理を行い、剥離強度評価試験を行った。その結果を表９に示した。
[Comparative Examples 7-8]
In Examples 1 and 2, the treatment was performed in the same manner as in Examples 1 and 2, except that TPU sheet II (polyurethane resin sheet / inorganic filler content 0 mass%) was used instead of EPDM sheet I. A peel strength evaluation test was conducted. The results are shown in Table 9.
［比較例９〜１０］
実施例１〜２において、ＥＰＤＭシートIの代わりに軟質塩ビシートII（軟質ポリ塩化ビニル樹脂シート／無機充填剤含有量０質量％）を用いた以外は、それぞれ実施例１〜２と同様にして処理を行い、剥離強度評価試験を行った。その結果を表１０に示した。
[Comparative Examples 9 to 10]
In Examples 1 and 2, the same procedure as in Examples 1 and 2 except that soft PVC sheet II (soft polyvinyl chloride resin sheet / inorganic filler content 0 mass%) was used instead of EPDM sheet I. The treatment was performed and a peel strength evaluation test was performed. The results are shown in Table 10.
［実施例１１］
厚み１．５ｍｍ×縦２００ｍｍ×横２５０ｍｍの軟質塩ビシートIII（軟質ポリ塩化ビニル樹脂シート／炭酸カルシウム８質量％及びシリカ５質量％含有、試験シート母材：引張せん断強度が６９７Ｎ／２．５ｃｍである）の試験シート２枚を用意した。
そして、高さ１００ｍｍの位置まで水が入れてある水槽（内寸で縦４２５ｍｍ×横７３０ｍｍ×高さ２１５ｍｍ）の底面に試験シートを置いた。
[Example 11]
Soft PVC sheet III (thickness 1.5 mm × length 200 mm × width 250 mm) (soft polyvinyl chloride resin sheet / calcium carbonate 8% by mass and silica 5% by mass, test sheet base material: tensile shear strength 697 N / 2.5 cm 2) test sheets were prepared.
And the test sheet | seat was put on the bottom face of the water tank (The inside dimension is length 425 mm * width 730 mm * height 215 mm) in which the water was put to the position of 100 mm in height.
次に、試験シートの縦方向中央部に縦９０ｍｍ×横２５０ｍｍの接合部幅で変性シリコーン系接着剤・スーパーＸ［セメダイン社製商品名］を水中で第１塗布（塗布量４００ｇ／ｍ2）した。 Next, a first application of a modified silicone adhesive Super X (trade name, manufactured by Cemedine Co., Ltd.) with a joint width of 90 mm in length and 250 mm in width in the center in the longitudinal direction of the test sheet (application amount: 400 g / m 2 ). did.
次に、接着剤の第１塗布面にガラスクロス（縦９０ｍｍ×横２５０ｍｍ）を積層し、当該積層面上に再度、変性シリコーン系接着剤・スーパーＸ［同前］を水中で第２塗布（塗布量４００ｇ／ｍ2）した。 Next, a glass cloth (90 mm in length × 250 mm in width) is laminated on the first application surface of the adhesive, and the modified silicone adhesive / Super X [same as above] is again applied in water on the lamination surface (second) The coating amount was 400 g / m 2 ).
次に、接着剤の第２塗布面上に試験シートを積層し、当該積層面上に押え用板として小鉄板（厚さ０．３ｍｍ×縦１２０ｍｍ×横２５０ｍｍ、０．７ｋｇ）を置いて、さらに小鉄板上にコンクリートブロック（３００ｍｍΦ×高さ８０ｍｍ、１０ｋｇ）を載せて、荷重をかけて放置した。
１２０時間放置後、接合した試験シートを取り出し、接合部の引張せん断強度試験を行い、接合部の引張せん断強度、引張せん断伸び、及び強度保持率を測定し、その結果を表１１に示した。
Next, a test sheet is laminated on the second application surface of the adhesive, and a small iron plate (thickness 0.3 mm × length 120 mm × width 250 mm, 0.7 kg) is placed on the lamination surface as a press plate, Further, a concrete block (300 mmΦ × height 80 mm, 10 kg) was placed on the small iron plate and left to stand under a load.
After leaving for 120 hours, the joined test sheet was taken out, the tensile shear strength test of the joint was performed, and the tensile shear strength, tensile shear elongation, and strength retention of the joint were measured. The results are shown in Table 11.
［引張せん断強度試験測定］
ＪＩＳ Ｋ−６８５０に準じて下記の引張試験条件で引張せん断強度試験を行った。
引張試験条件： 試験片 ２．５ｃｍ×２０ｃｍ
試験温度 ２３℃
試験片つかみ間（チャック間）１００ｍｍ
引張試験速度 ５０ｍｍ／ｍｉｎ
[Tensile shear strength test measurement]
A tensile shear strength test was conducted under the following tensile test conditions in accordance with JIS K-6850.
Tensile test conditions: Test piece 2.5 cm x 20 cm
Test temperature 23 ℃
100 mm between test piece grips (between chucks)
Tensile test speed 50mm / min
［強度保持率］
強度保持率＝接合部の引張せん断強度÷試験シート母材の引張せん断強度×１００％
[Strength retention]
Strength retention = Tensile shear strength of joint ÷ Tensile shear strength of test sheet base material x 100%
［実施例１２］
接着剤の第１塗布面にガラスクロスを積層せず、接着剤を第２塗布しないで、接着剤の第１塗布面上に試験シートを積層した以外は、実施例１１と同様にして処理を行い、接合部の引張せん断強度試験を行って接合部の引張せん断強度、引張せん断伸び、及び強度保持率を測定した。その結果を表１１に示した。
[Example 12]
The glass cloth is not laminated on the first application surface of the adhesive, the test sheet is laminated on the first application surface of the adhesive without applying the second adhesive, and the treatment is performed in the same manner as in Example 11. The tensile shear strength test of the joint was performed, and the tensile shear strength, tensile shear elongation, and strength retention of the joint were measured. The results are shown in Table 11.
［実施例１３］
試験シートの縦方向中央部接合幅を縦６５ｍｍ×横２５０ｍｍの接合部幅に代えた以外は、実施例１１と同様にして処理を行い、接合部の引張せん断強度試験を行って接合部の引張せん断強度、引張せん断伸び、及び強度保持率を測定した。その結果を表１１に示した。
[Example 13]
The test sheet was processed in the same manner as in Example 11 except that the joint width in the longitudinal center of the test sheet was changed to a joint width of 65 mm in length × 250 mm in width. Shear strength, tensile shear elongation, and strength retention were measured. The results are shown in Table 11.
［実施例１４］
接着剤の第１塗布面にガラスクロスを積層せず、接着剤を第２塗布しないで、接着剤の第１塗布面上に試験シート積層した以外は、実施例１３と同様にして処理を行い、接合部の引張せん断強度試験を行って接合部の引張せん断強度、引張せん断伸び、及び強度保持率を測定した。その結果を表１１に示した。
[Example 14]
The treatment was performed in the same manner as in Example 13 except that the glass cloth was not laminated on the first application surface of the adhesive, the test sheet was laminated on the first application surface of the adhesive without applying the second adhesive. The tensile shear strength test of the joint was performed to measure the tensile shear strength, tensile shear elongation, and strength retention of the joint. The results are shown in Table 11.
［実施例１５］
塗布する接着剤として、反応性変性アクリル系硬化型接着剤・スーパーＸＧ［セメダイン社製商品名］を用いた以外は、実施例１１と同様にして処理を行い、接合部の引張せん断強度試験を行って接合部の引張せん断強度、引張せん断伸び、及び強度保持率を測定した。その結果を表１１に示した。
[Example 15]
Except for using the reactive modified acrylic curable adhesive, Super XG [trade name, manufactured by Cemedine Co., Ltd.] as the adhesive to be applied, the same treatment as in Example 11 was performed, and the tensile shear strength test of the joint was performed. The tensile shear strength, tensile shear elongation, and strength retention of the joint were measured. The results are shown in Table 11.
［実施例１６］
厚み３．０ｍｍ×縦２００ｍｍ×横２５０ｍｍの軟質塩ビシートIV（軟質ポリ塩化ビニル樹脂シート／炭酸カルシウム５質量％及びシリカ７質量％含有、試験シート母材：引張せん断強度が１２８６Ｎ／２．５ｃｍである）の試験シート２枚を用意した。
高さ１００ｍｍの位置まで水が入れてある水槽（内寸で縦４２５ｍｍ×横７３０ｍｍ×高さ２１５ｍｍ）の底面に試験シートを置いた。
[Example 16]
Thickness 3.0 mm × length 200 mm × width 250 mm soft PVC sheet IV (soft polyvinyl chloride resin sheet / calcium carbonate 5% by mass and silica 7% by mass, test sheet base material: tensile shear strength 1286 N / 2.5 cm 2) test sheets were prepared.
A test sheet was placed on the bottom surface of a water tank (inside dimensions: 425 mm long × 730 mm wide × 215 mm high) with water up to a height of 100 mm.
次に、試験シートの縦方向中央部に縦８５ｍｍ×横２５０ｍｍの接合部幅で変性シリコーン系接着剤・スーパーＸ［セメダイン社製商品名］を水中で塗布（塗布量９００ｇ／ｍ2）した。 Next, a modified silicone adhesive / Super X [trade name, manufactured by Cemedine Co., Ltd.] was applied in water (applied amount: 900 g / m 2 ) with a joint width of 85 mm in length × 250 mm in width in the center in the vertical direction of the test sheet.
次に、接着剤の塗布面上に試験シートを積層し、当該積層面上に押え用板として小鉄板（厚さ０．３ｍｍ×縦１２０ｍｍ×横２５０ｍｍ、０．７ｋｇ）を置いて、さらに小鉄板上にコンクリートブロック（３００ｍｍΦ×高さ８０ｍｍ、１０ｋｇ）を載せて、荷重をかけて放置した。
２４０時間放置後、接合した試験シートを取り出し、接合部の引張せん断強度試験を行い、接合部の引張せん断強度、引張せん断伸び、及び強度保持率を測定した。その結果を表１２に示した。
Next, a test sheet is laminated on the adhesive application surface, and a small iron plate (thickness 0.3 mm × length 120 mm × width 250 mm, 0.7 kg) is placed on the lamination surface as a presser plate. A concrete block (300 mmΦ × height 80 mm, 10 kg) was placed on the iron plate and left to stand under a load.
After leaving for 240 hours, the joined test sheet was taken out, the tensile shear strength test of the joint was performed, and the tensile shear strength, tensile shear elongation, and strength retention of the joint were measured. The results are shown in Table 12.
上記の結果から、本発明方法が水中での熱可塑性樹脂製遮水シートの補修に対して、きわめて有効な方法であることが明らかとなった。また、接着剤に加えてガラスクロスを積層させることにより、接合部の強度及び伸びが向上することが判明した。 From the above results, it has been clarified that the method of the present invention is a very effective method for repairing a water-proof sheet made of thermoplastic resin in water. It has also been found that the strength and elongation of the joint are improved by laminating glass cloth in addition to the adhesive.
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| JP3437245B2 (en) * | 1994-03-23 | 2003-08-18 | 東洋ゴム工業株式会社 | Repair method of vulcanized rubber sheet in water |
| JP3525122B2 (en) * | 2001-07-02 | 2004-05-10 | 旭化成ジオテック株式会社 | How to repair a seepage control sheet in water |
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