JP4836571B2 - Airtight adhesive tape - Google Patents
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- JP4836571B2 JP4836571B2 JP2005373542A JP2005373542A JP4836571B2 JP 4836571 B2 JP4836571 B2 JP 4836571B2 JP 2005373542 A JP2005373542 A JP 2005373542A JP 2005373542 A JP2005373542 A JP 2005373542A JP 4836571 B2 JP4836571 B2 JP 4836571B2
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Description
本発明は、建設工事で気密を目的に使用する生分解性シートを固定したり連結する際に使用される気密用粘着テープにおいて、固定・連結したシートの反発、収縮・引張、外部からの衝撃に対しても破断や剥離が起こり難い適度な粘着強度、引張強度と伸びを有しており、施工時の柔軟性・接着性など施工性も良好で、さらに、最終的に産業廃棄物を削減することができたり、廃棄のための分別処理作業を省力化することができ、土中に廃棄された場合にも完全に分解し環境への負荷が低減できるといった、環境への配慮と作業効率の改善に役立つ生分解性粘着テープに関するものである。 The present invention relates to an airtight pressure-sensitive adhesive tape used for fixing or connecting a biodegradable sheet used for airtightness in construction work, and the rebound, shrinkage, tension, and external impact of the fixed and connected sheet. It has moderate adhesive strength, tensile strength and elongation that are less likely to break or peel off, has good workability such as flexibility and adhesion during construction, and finally reduces industrial waste Environmental considerations and work efficiency, such as being able to reduce the burden on the environment by being able to reduce the burden on the environment by completely disassembling it when discarded in the soil. The present invention relates to a biodegradable pressure-sensitive adhesive tape that is useful for improving the quality.
近年、環境問題への配慮（施工時の環境負荷低減・産業廃棄物の削減・周辺環境への影響低減など）や施工の効率化・省力化を目的に、建設工事の現場では生分解性のフィルムやシートを使用した工法が検討されるようになってきた。
例えば以下のような用途が考えられる。
〇軟弱地中に含まれる水や空気を強制的に脱水し、地盤の密度・強度を増加させる地盤改良工法に用いられる気密シート。
〇含水比が非常に高い建設現場で発生する建設排土や海水・湖水中の浚渫土を減容化・再利用するなどの目的で、土をシートで包み込み脱水する際に使用される気密シート。
〇浚渫土を砂で被覆して海底地盤を改良する際、砂が含水比の高い浚渫土に巻き込まれることを防止することを目的に設置される砂・浚渫土分離シート。
〇仮設テントなどに使用される膜シート（屋根材や減圧型を含む室内空間形成材など）
〇アスベスト除去処理の際に使用される飛散防止用養生シート（減圧下に対応可能なシート）
以上のような生分解性シートの固定・連結を目的に粘着テープが使用される。
このような粘着テープには、施工時に柔軟性、汚れ面・粗面への接着性、施工
後に適度な強度・伸び・耐反発性、耐せん断力、最終的に生分解性などの性能が求められる。しかし、これまでこれらの施工時・施工後の要求を同時に満足した粘着テープはなかった。
例えば合成繊維不織布の片面にアスファルト系や合成ゴム系粘着剤を塗布した防水テープや特許文献１で提案されているような熱可塑性樹脂製フラットヤーンを織製することによって得られた織布層に熱可塑性樹脂フィルムをラミネートして得られる基布をテープ基材として、片面にアクリル系粘着剤を塗布した養生テープがある。
しかし、該防水テープについては、建設関連で使用される透湿防水シートを固定するには十分であるが、例えば、屋外の建設工事などで大規模な地面に敷き詰められた厚手のシートを連結する場合には、地面の凹凸により波打ったシート面に対する追従性が不十分であったり、施工後にシートが収縮してせん断方向に長時間力がかかった場合に、粘着剤の凝集力不足のためテープが剥がれるといった問題があった。さらに、それらの粘着テープは生分解性がないため、使用後に除去する必要があり、産業廃棄物の発生、除去手間、産廃処理費の発生などの問題が生じていた。
In recent years, with the aim of considering environmental issues (reducing environmental impact during construction, reducing industrial waste, reducing the impact on the surrounding environment, etc.) and improving the efficiency and labor saving of construction work, Construction methods using films and sheets have been studied.
For example, the following uses can be considered.
O Airtight sheet used in ground improvement methods that forcibly dewater water and air contained in soft ground and increase the density and strength of the ground.
〇An air-tight sheet used when wrapping soil with a sheet and dewatering it for the purpose of volume reduction and reuse of construction soil generated at construction sites with a very high water content ratio and dredged soil in seawater and lake water .
〇 Sand and dredged soil separation sheet installed for the purpose of preventing sand from being caught in dredged soil with a high water content when improving dredged soil by covering dredged soil with sand.
〇Membrane sheets used for temporary tents (roof materials and indoor space forming materials including decompression type)
〇 Curing prevention sheet used for asbestos removal treatment (sheet that can be used under reduced pressure)
An adhesive tape is used for the purpose of fixing and connecting the biodegradable sheet as described above.
Such adhesive tapes are required to have performance such as flexibility during construction, adhesion to dirty or rough surfaces, moderate strength / elongation / repulsion resistance, shear resistance, and finally biodegradability after construction. It is done. However, there has been no adhesive tape that satisfies these requirements at the time of construction and after construction.
For example, on a woven fabric layer obtained by weaving a waterproof tape in which asphalt or synthetic rubber adhesive is applied to one side of a synthetic fiber nonwoven fabric or a flat yarn made of thermoplastic resin as proposed in Patent Document 1. There is a curing tape in which a base fabric obtained by laminating a thermoplastic resin film is used as a tape base material and an acrylic adhesive is applied on one side.
However, the waterproof tape is sufficient for fixing a moisture-permeable waterproof sheet used in construction, for example, connecting a thick sheet spread on a large scale in outdoor construction work, etc. In some cases, due to insufficient cohesive strength of the adhesive, when the followability to the corrugated sheet surface is insufficient due to unevenness of the ground or when the sheet contracts after construction and a force is applied in the shear direction for a long time There was a problem that the tape peeled off. Furthermore, since these adhesive tapes are not biodegradable, they have to be removed after use, causing problems such as the generation of industrial waste, the trouble of removing, and the cost of industrial waste treatment.
本発明は、建築関連現場で気密を目的に使用される生分解性フィルムやシートの固定・連結に使用する気密用粘着テープであって、当該生分解性フィルムやシートに対して相性がよく、テープ自体の強度・柔軟性のバランスがとれており、粗面・汚れ面・凹凸面への接着性が良いため施工時の作業性が良く、かつ使用期間中は目的とした固定・連結の機能を持続することで気密性を確保し、使用後埋設された場合には土中で分解することで消滅し、環境負荷の少ない粘着テープを提供することを目的とする。
The present invention is an airtight pressure-sensitive adhesive tape used for fixing and connecting biodegradable films and sheets used for the purpose of airtightness in construction-related sites, and has good compatibility with the biodegradable films and sheets, The tape itself has a good balance of strength and flexibility, and it has good adhesion to rough, dirty, and uneven surfaces, so workability during construction is good, and the intended fixing and connection functions during the period of use. The purpose is to provide a pressure-sensitive adhesive tape with a low environmental impact by ensuring airtightness by sustaining and disappearing by being decomposed in the soil when buried after use.
上記目的を達成するため、鋭意研究した結果、適度な厚みと強度・伸度をもった生分解性フィルムをテープ基材として使用し、適度な厚みの粘着剤層を設けることにより目的を達成することができることが判明した。
本発明は、特定の成分からなる生分解性樹脂を使用し、成膜加工することによって得られる適度な厚み、強度、伸度を持った生分解性フィルムをテープ基材として使用し、該テープ基材の片面もしくは両面に、適度な厚みに粘着剤を塗布した粘着テープを用いることで、上記目的を達成することが判明し、本発明を完成するに至った。
すなわち、本発明は、建設工事現場において、減圧下で気密性を確保する目的で、生分解性シートを連結・固定するために用いる粘着テープであって、フィルム基材の片面もしくは両面に粘着剤層が形成され、フィルム基材が生分解性を有し、澱粉エステル系樹脂、ポリブチレンサクシネート系樹脂、ポリ乳酸系樹脂の１種類もしくは２種類を含んでなり、その含有量が５０質量％以上であって、該基材の厚みが５０〜６００μｍであり、粘着剤層の厚みがフィルム基材厚の２５〜４００％の範囲にあり、該粘着テープの長手方向と幅方向の引張強度がともに１０〜１００Ｎ／１０ｍｍ、伸び率がともに１００〜５００％であり、粘着剤が、ＪＩＳ Ｚ０２３７ で定められたＳＵＳ板に対する粘着力が２３℃の条件下で５Ｎ／１０ｍｍ以上あり、−１０℃の条件下で３Ｎ／１０ｍｍ以上であり、貼り付け面積２５ｍｍ×２５ｍｍ、荷重１ｋｇ、温度４０℃の条件下での保持力測定で、６０分以上落下しない凝集力を有することを特徴とした気密用粘着テープである。
As a result of diligent research in order to achieve the above object, a biodegradable film having an appropriate thickness, strength and elongation is used as a tape base material, and the object is achieved by providing an adhesive layer with an appropriate thickness. It turns out that you can.
The present invention uses a biodegradable film having a suitable thickness, strength, and elongation obtained by film-forming processing using a biodegradable resin composed of a specific component as a tape substrate. It became clear that the said objective was achieved by using the adhesive tape which apply | coated the adhesive to moderate thickness on the single side | surface or both surfaces of a base material, and came to complete this invention.
That is, the present invention is an adhesive tape used for connecting and fixing a biodegradable sheet for the purpose of ensuring airtightness under reduced pressure at a construction site, and is an adhesive on one or both sides of a film substrate A layer is formed, the film substrate is biodegradable, and includes one or two types of starch ester resin, polybutylene succinate resin, and polylactic acid resin, and the content thereof is 50% by mass. be more than a thickness of the substrate is 50 to 600, the thickness of the adhesive layer is in the range of 25 to 400% of the film substrate thickness, the longitudinal direction and the width direction of the tensile strength of the adhesive tape Both are 10 to 100 N / 10 mm, the elongation is 100 to 500%, and the adhesive has an adhesive strength of 5 N / 10 mm or more under the condition of 23 ° C. with respect to the SUS plate defined in JIS Z0237. 3N / 10 mm or more under the condition of −10 ° C., and having a cohesive force that does not drop for 60 minutes or more in the holding force measurement under the conditions of a pasting area of 25 mm × 25 mm, a load of 1 kg, and a temperature of 40 ° C. This is an airtight adhesive tape.
また本発明においては、粘着剤層の中間部に不織布を設けることができる。 Moreover, in this invention, a nonwoven fabric can be provided in the intermediate part of an adhesive layer.
従って、本発明により強度・柔軟性のバランスがとれており、粗面・汚れ面・凹凸面への接着性が良いため施工時の作業性が良く、かつ使用期間中は目的とした固定、連結の機能を持続することで気密性を確保し、使用後埋設された場合には土中で分解することで消滅する環境負荷の少ない粘着テープを提供することができる。 Therefore, strength and flexibility are balanced according to the present invention, workability during construction is good due to good adhesion to rough surfaces, dirty surfaces, and uneven surfaces, and the intended fixing and connection during the period of use. By maintaining this function, it is possible to provide an adhesive tape that secures airtightness and has a low environmental load that disappears by being decomposed in the soil when embedded after use.
本発明のテープ基材に使用する樹脂には生分解性を有する樹脂を用いることができる。生分解性樹脂としては、例えば昭和高分子（株）製のビオノーレ（ポリブチレンサクシネート系）、日本コーンスターチ（株）製コーンポール（澱粉エステル系ポリマー）、モンサント（株）製バイオポール（３−ヒドロキシ酪酸、３−ヒドロキシ吉草酸等のポリマー）、ダイセル化学工業（株）製のセルグリーン（酢酸セルロース系ポリマー）、三井化学（株）製レイシア（ポリ乳酸系ポリマー）等が挙げられるが、特にポリブチレンサクシネート系、澱粉エステル系、ポリ乳酸系の生分解性樹脂が好適に用いられ、その含有量は５０質量％以上であることが好ましい。
基材の厚みは５０〜６００μｍの範囲で選択され、好ましくは、１００〜３００μｍの範囲で選択される。基材の厚みが５０μｍより薄いと被着体に対する追従性は良いものの、強度不足や基材のよれなどによる作業性不良となり、６００μｍより厚くなると、被着体への追従性不足や作業性不良となり好ましくない。
本発明の粘着テープに用いる粘着剤の種類には、特に制限はないが、例えば天然ゴム系粘着剤、アクリル系粘着剤、ウレタン系粘着剤、合成ゴム系粘着剤、ポリエステル系粘着剤等を用いることができる。
粘着剤層の厚みは、基材厚みの２５〜４００％の範囲で調整され、好ましくは１００〜３５０％の範囲で調整される。基材厚みの２５％より薄いと被着体に対する追従性や接着性が不良となり、４００％より厚いと、粘着剤を塗布する加工が困難となり好ましくない。
本発明の粘着テープは、長手方向と幅方向の破断強度がともに１０〜１００Ｎ／１０ｍｍ、伸び率がともに１００〜５００％に調整される。
Resin which has biodegradability can be used for resin used for the tape base material of the present invention. Examples of biodegradable resins include Bionole (polybutylene succinate) manufactured by Showa Polymer Co., Ltd., Corn Pol (starch ester polymer) manufactured by Nippon Corn Starch Co., Ltd., Biopol (3- Examples thereof include polymers such as hydroxybutyric acid and 3-hydroxyvaleric acid), cell green (cellulose acetate polymer) manufactured by Daicel Chemical Industries, Ltd., and lacia (polylactic acid polymer) manufactured by Mitsui Chemicals. Polybutylene succinate-based, starch ester-based, and polylactic acid-based biodegradable resins are preferably used, and the content thereof is preferably 50% by mass or more.
The thickness of the substrate is selected in the range of 50 to 600 μm, and preferably in the range of 100 to 300 μm. When the thickness of the substrate is less than 50 μm, the followability to the adherend is good, but the workability is poor due to insufficient strength or the substrate is twisted. When the thickness is more than 600 μm, the followability to the adherend is insufficient or the workability is poor. It is not preferable.
The type of pressure-sensitive adhesive used in the pressure-sensitive adhesive tape of the present invention is not particularly limited. For example, natural rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, synthetic rubber-based pressure-sensitive adhesives, polyester-based pressure-sensitive adhesives, etc. are used. be able to.
The thickness of the pressure-sensitive adhesive layer is adjusted in the range of 25 to 400%, preferably in the range of 100 to 350% of the substrate thickness. If the thickness is less than 25% of the substrate thickness, the followability and adhesion to the adherend will be poor, and if it is thicker than 400%, it will be difficult to apply the pressure-sensitive adhesive.
The pressure-sensitive adhesive tape of the present invention is adjusted such that the breaking strength in the longitudinal direction and the width direction is 10 to 100 N / 10 mm and the elongation is 100 to 500%.
本発明の粘着テープの粘着剤層には、中間部へ不織布を積層することができる。
不織布を積層することで、粘着剤テープの引張強度が向上し、さらに被着体となるシートの収縮や荷重により、弱い力が長時間かかるような状況でも、粘着剤層が伸び難くなるため、粘着テープの破断や剥がれが起こり難くなる。
不織布の材質としては、例えばレーヨン、パルプ、ポリエステル、ポリプロピレン等の汎用の不織布として使用されているものや、ポリ乳酸系樹脂、ポリブチレンサクシネート系樹脂、澱粉エステル系樹脂等の生分解性樹脂を使用することができる。さらに、不織布の坪量は特に制限はないが、好ましくは５〜５０ｇ／ｍ２が好ましい。
不織布の坪量が５ｇ／ｍ２より小さいと、強度が不足し、５０ｇ／ｍ２より大きくなると、粘着剤層の柔軟性が損なわれ、凹凸面への接着性が良くない。
A nonwoven fabric can be laminated | stacked on an intermediate part in the adhesive layer of the adhesive tape of this invention.
By laminating the nonwoven fabric, the tensile strength of the pressure-sensitive adhesive tape is improved, and the pressure-sensitive adhesive layer is difficult to stretch even in situations where weak force is applied for a long time due to the shrinkage and load of the sheet to be adhered, The adhesive tape is less likely to break or peel off.
Examples of the material of the nonwoven fabric include biodegradable resins such as those used as general-purpose nonwoven fabrics such as rayon, pulp, polyester, and polypropylene, and polylactic acid resins, polybutylene succinate resins, and starch ester resins. Can be used. Furthermore, although the basis weight of the nonwoven fabric is not particularly limited, preferably 5 to 50 g / m 2.
When the basis weight of the nonwoven fabric is less than 5 g / m 2 , the strength is insufficient, and when it is greater than 50 g / m 2 , the flexibility of the pressure-sensitive adhesive layer is impaired, and the adhesion to the uneven surface is not good.
本発明の粘着テープは、ＪＩＳ Ｚ０２３７で定められたＳＵＳ板に対する粘着力が２３℃で５Ｎ／１０ｍｍ以上であり、−１０℃の条件下で３Ｎ／１０ｍｍ以上であり、貼り付け面積２５ｍｍ×２５ｍｍ、荷重１ｋｇ、温度４０℃の条件下での保持力測定で、６０分以上落下しない凝集力を有することができる。本粘着テープは冬場の屋外での使用も想定しており、２３℃での粘着力が５Ｎ／ｍｍ以上でも、−１０℃の条件下での粘着力が３Ｎ／１０ｍｍより低いと、冬場の貼り付け作業性が不良となる。また、２３℃と−１０℃の条件下での粘着力が十分であっても、保持力が、４０℃で６０分以内に落下する程度の凝集力しかない場合には、夏場使用時などに、本粘着テープで連結・固定したシートがずれたり、剥がれるといった問題が発生する。 The pressure-sensitive adhesive tape of the present invention has an adhesive strength with respect to a SUS plate defined by JIS Z0237 of 5 N / 10 mm or more at 23 ° C., 3 N / 10 mm or more under the condition of −10 ° C., and a bonding area of 25 mm × 25 mm. By holding force measurement under the conditions of a load of 1 kg and a temperature of 40 ° C., it can have a cohesive force that does not drop for 60 minutes or more. This adhesive tape is also expected to be used outdoors in winter. Even if the adhesive strength at 23 ° C is 5 N / mm or more, if the adhesive strength at -10 ° C is lower than 3 N / 10 mm, it will be stuck in winter. Attachment workability becomes poor. In addition, even if the adhesive strength under the conditions of 23 ° C. and −10 ° C. is sufficient, if the holding power is only a cohesive force that drops within 60 minutes at 40 ° C. The problem arises that the sheets connected and fixed with this adhesive tape are displaced or peeled off.
本発明の粘着テープに適用できる粘着剤のフィルム基材への塗工方法としては
通常用いられる方法、例えば、グラビアコータ法、ロールコータ法、リバースコー
タ法、ドクターブレード法、バーコータ法、コンマコータ法、ダイコータ法、リッ
プコータ法、ナイフコータ法などが挙げられる。これらのうち好ましいものはダイ
コータ法、コンマコータ法である。塗工後は、熱風または（近）赤外線、高周波な
どのエネルギーにより加熱して溶媒あるいは分散媒の乾燥を行う。
また、本発明の気密用粘着テープは、とくに粘着剤を、天然ゴム系等の生分解
性粘着剤にすれば、粘着剤及び生分解性フィルム基材がすべて生分解性の物質からなる粘着テープとなり、建設工事現場において、気密性を確保する目的で用いる生分解性シートと併せてすべて完全な生分解性材料からなるので、建設工事を終了した現場において、すべてそのまま埋設することができる。
次に実施例によって本発明をさらに詳細に説明するが、本発明はこれらの例によって何ら限定されるものではない。
As a method for coating a film substrate with a pressure-sensitive adhesive applicable to the pressure-sensitive adhesive tape of the present invention, for example, a gravure coater method, a roll coater method, a reverse coater method, a doctor blade method, a bar coater method, a comma coater method, Examples include a die coater method, a lip coater method, and a knife coater method. Of these, the die coater method and the comma coater method are preferable. After coating, the solvent or dispersion medium is dried by heating with hot air or energy such as (near) infrared rays or high frequency.
The airtight pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape in which the pressure-sensitive adhesive and the biodegradable film substrate are all made of a biodegradable substance, particularly when the pressure-sensitive adhesive is a natural rubber-based biodegradable pressure-sensitive adhesive. In the construction site, all of the biodegradable material used together with the biodegradable sheet used for ensuring airtightness is made of a completely biodegradable material, so that it can be embedded as it is at the site where the construction work is completed.
EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
（基材の調整）
日本コーンスターチ社製コーンポールＦ３Ｆを原料に使用し、Ｔダイ加工で製造した膜厚２００μｍの澱粉エステル系生分解性フィルムを準備した。さらに、準備したフィルムの両面をコロナ処理し、フィルム表面の濡れ指数が４５ｄｙｎ／ｃｍ以上になるように調整し、基材ａを準備した。
（粘着剤の調整）
アクリル酸２−エチルへキシル６０質量部、アクリル酸ブチル３０質量部、アクリル酸エチル８質量部、アクリル酸２質量部、アクリル酸２−ヒドロキシエチル０．０７質量部、アゾビスイソブチロニトリル０．０８質量部、酢酸エチル６０質量部及びトルエン５質量部をコンデンサー、温度計及び攪拌機付きフラスコに仕込み、９０℃に加温して重合させ、重合反応開始から５時間後に、アゾビスイソブチロニトリル０．１質量部をトルエン１０質量部に溶解した溶液を追加し、さらに５時間重合反応を行なった。続いてトルエンで稀釈し、固形分５０％、粘度１８０００ｍＰａ・ｓ／２３℃のアクリル共重合体溶液を得た。得られたアクリル共重合体溶液１００質量部に対し、荒川化学工業製のペンセルＤ１３５を２．５質量部、スーパーエステルＡ−１００を５質量部、スーパーエステルＬを２．５質量部、トルエン１０質量部を添加し、固形分５０％、粘度１２０００ｍＰａ・ｓ／２３℃の粘着剤ａを得た。
（粘着テープの製造）
両面シリコーン剥離処理の離型紙に粘着剤ａを乾燥後の糊厚が１２０μｍになるように塗布し、乾燥後巻き取り直前に、レーヨン不織布（坪量１７ｇ／ｍ２）を粘着剤面に貼り合わせ巻き取った（加工品Ａ）。次に片面シリコーン剥離処理の離型紙に乾燥後の糊厚が１２０μｍになるように粘着剤ａを塗布し、乾燥後粘着剤面を加工品Ａの不織布面に貼り合わせ、巻き取り直前に片面シリコーン剥離紙を剥がしながら粘着剤を転写し、加工品Ａの粘着剤貼り合わせ品を得た（加工品Ｂ）。続いて加工品Ｂの内側粘着剤面と基材ａを貼り合わせた後巻き取り、粘着剤層の厚みが２５０μｍで中間部に不織布を積層した粘着テープａを得た。
得られた粘着テープの離型紙を剥がしたものについて、引張強度、伸び率、粘着力、保持力、作業性を評価した。
引張強度：粘着テープ幅１０ｍｍ×長さ１５０ｍｍのテストピースを準備し、チャック間距離１００ｍｍ、引張速度３００ｍｍ／ｍｉｎで破断するまでの
最大強度を測定した。
伸び率：引張強度測定時に破断時の伸び率を測定した。
粘着力１：ＪＩＳ Ｚ０２３７に準じて、２３℃の条件下でのＳＵＳ板に対する粘着力を測定した。
粘着力２：粘着力１で測定温度を−１０℃に変更し、粘着力を測定した。
保持力：ＪＩＳ Ｚ０２３７に準じ被着体ＳＵＳ板、１ｋｇ荷重、貼り付け面積
２５ｍｍ×２５ｍｍ、測定温度４０℃での保持力を評価した。
○ １時間以上保持 △０．５〜１時間で落下 ×０．５時間以内に落下
実用試験：日本コーンスターチ（株）製コーンポールＦ３ＦをＴダイで押出し成形して厚み５００μｍ、長さ１０ｍ、幅２ｍのシートを作成し、これを屋外の凹凸のある地面に２枚を一部が重なって繋ぎ合わせるように敷き、その重なりあった繋ぎ部に作成した粘着テープを貼り付け、貼り付け易さを評価した。
(Adjustment of base material)
A corn pole F3F manufactured by Nippon Corn Starch Co., Ltd. was used as a raw material, and a 200 μm-thick starch ester biodegradable film produced by T-die processing was prepared. Furthermore, the both surfaces of the prepared film were corona-treated and adjusted so that the wetting index of the film surface was 45 dyn / cm or more, thereby preparing a substrate a.
(Adhesive adjustment)
2-ethylhexyl acrylate 60 parts by mass, butyl acrylate 30 parts by mass, ethyl acrylate 8 parts by mass, acrylic acid 2 parts by mass, 2-hydroxyethyl acrylate 0.07 parts by mass, azobisisobutyronitrile 0 0.08 parts by mass, 60 parts by mass of ethyl acetate and 5 parts by mass of toluene were charged into a condenser, a thermometer and a flask equipped with a stirrer, heated to 90 ° C. for polymerization, and after 5 hours from the start of the polymerization reaction, azobisisobutyro A solution in which 0.1 part by mass of nitrile was dissolved in 10 parts by mass of toluene was added, and a polymerization reaction was further performed for 5 hours. Subsequently, the mixture was diluted with toluene to obtain an acrylic copolymer solution having a solid content of 50% and a viscosity of 18000 mPa · s / 23 ° C. With respect to 100 parts by mass of the obtained acrylic copolymer solution, 2.5 parts by mass of Pencel D135 manufactured by Arakawa Chemical Industries, 5 parts by mass of Superester A-100, 2.5 parts by mass of Superester L, 10 toluene The mass part was added and the adhesive a with a solid content of 50% and a viscosity of 12000 mPa * s / 23 degreeC was obtained.
(Manufacture of adhesive tape)
Apply adhesive a to the release paper of double-sided silicone release treatment so that the glue thickness after drying is 120 μm, and paste the rayon nonwoven fabric (basis weight 17 g / m 2 ) on the adhesive surface just before winding after drying. It was wound up (processed product A). Next, the adhesive a is applied to the release paper of the single-sided silicone release treatment so that the glue thickness after drying becomes 120 μm, and after drying, the adhesive side is bonded to the nonwoven fabric surface of the processed product A, and the single-sided silicone just before winding The pressure-sensitive adhesive was transferred while peeling the release paper to obtain a bonded product of the processed product A (processed product B). Subsequently, the inner pressure-sensitive adhesive surface of the processed product B and the base material a were bonded together and wound up to obtain a pressure-sensitive adhesive tape a in which the pressure-sensitive adhesive layer had a thickness of 250 μm and a nonwoven fabric was laminated on the middle part.
About the thing which peeled the release paper of the obtained adhesive tape, tensile strength, elongation rate, adhesive force, holding power, and workability | operativity were evaluated.
Tensile strength: A test piece having an adhesive tape width of 10 mm and a length of 150 mm was prepared, and the maximum strength until fracture was measured at a chuck distance of 100 mm and a tensile speed of 300 mm / min.
Elongation: The elongation at break was measured when measuring the tensile strength.
Adhesive strength 1: According to JIS Z0237, the adhesive strength with respect to the SUS board in 23 degreeC conditions was measured.
Adhesive strength 2: With the adhesive strength 1, the measurement temperature was changed to −10 ° C., and the adhesive strength was measured.
Holding force: adherend SUS plate, 1 kg load, affixed area according to JIS Z0237
The holding power at 25 mm × 25 mm and a measurement temperature of 40 ° C. was evaluated.
○ Hold for 1 hour or more △ Dropped within 0.5 to 1 hour × Dropped within 0.5 hours Practical test: Thickness 500 μm, length 10 m, width by extruding corn pole F3F manufactured by Nippon Corn Starch Co., Ltd. with a T-die Create a sheet of 2m, lay it on the ground with unevenness outdoors and lay it together so that part of it overlaps, and attach the created adhesive tape to the overlapped part. evaluated.
実施例１で基材を、日本コーンスターチ（株）製コーンポールＦ３Ｆを原料に使用した膜厚１００μｍの澱粉エステル系フィルムに変更した以外は、実施例−１に準じて粘着剤テープｂを作成し、性能評価を行なった。
A pressure-sensitive adhesive tape b was prepared in the same manner as in Example 1 except that the base material was changed to a starch ester film having a film thickness of 100 μm using Corn Pol F3F manufactured by Nippon Corn Starch Co., Ltd. as a raw material in Example 1. The performance was evaluated.
実施例−１で粘着剤を綜研化学社製ＳＫダイン１７２０ １００質量部に綜研化学社製硬化剤Ｌ−４５を１．０質量部添加した配合品に変更し、糊厚を片面５０μｍに変更し、粘着剤層の総厚が１１０μｍになるように変更した以外は実施例−１に準じて粘着テープｃを作成し、性能評価を行なった。
In Example 1, the pressure-sensitive adhesive was changed to a blended product obtained by adding 1.0 part by mass of a hardener L-45 made by Soken Chemical Co., Ltd. to 100 parts by mass of SK Dyne 1720 made by Soken Chemical Co., Ltd., and the paste thickness was changed to 50 μm on one side. A pressure-sensitive adhesive tape c was prepared according to Example 1 except that the total thickness of the pressure-sensitive adhesive layer was changed to 110 μm, and performance evaluation was performed.
（基材の調整）
日本コーンスターチ（株）製コーンポールＦ３Ｆを原料に使用し、Ｔダイ加工で製造した膜厚１５０μの澱粉エステル系生分解性フィルムを準備した。さらに、準備したフィルムの両面をコロナ処理し、フィルム表面の濡れ指数が４５ｄｙｎ／ｃｍ以上になるように調整し、基材ｂを準備した。
（粘着剤の調整）
トルエン７０部に素練りによりムーニー粘度を７０に調整した天然ゴム１５部を溶解した後、エステルガムＡＡＧ（荒川化学工業社製）を１８部、老化防止剤アンテージＷ−４００（川口化学工業社製）を０.３部添加し、十分溶解させ固形分３０％、２３℃の粘度が１００００ｍPa・ｓの粘着剤ｂを得た。
（粘着テープの製造）
基材ｂにＫＳ−８４７Ｔ（信越化学工業社製シリコーン剥離剤）を乾燥後の塗布量が０．３ｇ／ｍ２になるように塗布し、乾燥後巻き取り、基材ｂの剥離処理品を得た（加工品Ｃ）。次に両面シリコーン剥離処理の離型紙に粘着剤ｂを乾燥後の糊厚が１２０μｍになるように塗布し、乾燥後巻き取り直前に、ポリ乳酸系不織布（坪量２０ｇ／ｍ２）を粘着剤面に貼り合わせ巻き取った（加工品Ｄ）。次に片面シリコーン剥離処理の離型紙に乾燥後の糊厚が１２０μｍになるように粘着剤ａを塗布し、乾燥後粘着剤面を加工品Ｄの不織布面に貼り合わせ、巻き取り直前に片面シリコーン剥離紙を剥がしながら粘着剤を転写し、加工品Ｄの粘着剤貼り合わせ品を得た（加工品Ｅ）。続いて加工品Ｅの内側粘着剤面と加工品Ｃを貼り合わせた後巻き取り、粘着剤層の厚みが２５０μｍで中間部に不織布を積層した粘着テープｄを得た。
(Adjustment of base material)
A 150-μm thick starch ester biodegradable film manufactured by T-die processing was prepared using Corn Paul F3F manufactured by Nippon Corn Starch Co., Ltd. as a raw material. Furthermore, both surfaces of the prepared film were subjected to corona treatment and adjusted so that the wetting index of the film surface was 45 dyn / cm or more, thereby preparing a base material b.
(Adhesive adjustment)
After dissolving 15 parts of natural rubber having a Mooney viscosity adjusted to 70 by mastication in 70 parts of toluene, 18 parts of ester gum AAG (Arakawa Chemical Industries) is produced, and the anti-aging agent Antage W-400 (manufactured by Kawaguchi Chemical Industries, Ltd.). ) Was added and dissolved sufficiently to obtain a pressure-sensitive adhesive b having a solid content of 30% and a viscosity at 23 ° C. of 10,000 mPa · s.
(Manufacture of adhesive tape)
KS-847T (Shin-Etsu Chemical Co., Ltd. silicone release agent) is applied to the base material b so that the coating amount after drying is 0.3 g / m 2 , wound after drying, and the release product of the base material b is applied. Obtained (processed product C). Next, the adhesive b is applied to the release paper subjected to the double-sided silicone release treatment so that the paste thickness after drying becomes 120 μm, and the polylactic acid-based nonwoven fabric (basis weight 20 g / m 2 ) is adhesive immediately before winding after drying. It was bonded and wound on the surface (processed product D). Next, the adhesive a is applied to the release paper of the single-sided silicone release treatment so that the paste thickness after drying becomes 120 μm, and after drying, the adhesive side is bonded to the nonwoven fabric surface of the processed product D, and the single-sided silicone just before winding The pressure-sensitive adhesive was transferred while peeling the release paper to obtain a bonded product of the processed product D (processed product E). Subsequently, the inner pressure-sensitive adhesive surface of the processed product E and the processed product C were bonded together and wound up to obtain a pressure-sensitive adhesive tape d in which the thickness of the pressure-sensitive adhesive layer was 250 μm and a nonwoven fabric was laminated on the middle part.
（比較例１）
ポリエステル不織布の片面にブチルゴム系粘着剤を塗布した粘着テープ（カモ井加工紙社製防水気密用テープ商品名：「強力ブチル君Ｎｏ．５００Ｓ」）を使用した。
(Comparative Example 1)
A pressure-sensitive adhesive tape coated with a butyl rubber-based pressure-sensitive adhesive on one side of a polyester non-woven fabric (trade name: “Strong Butyl-kun No. 500S” manufactured by Kamoi Paper Co., Ltd.) was used.
（比較例２）
ポリエチレンクロス基材へ粘着加工した粘着テープ（ダイヤテックス社製商品名：パイオランテープＹ０９ＧＲ）を使用した。
(Comparative Example 2)
An adhesive tape (trade name: Pioran tape Y09GR, manufactured by Diatex Co., Ltd.) that was adhesively processed to a polyethylene cloth substrate was used.
（比較例３）
（基材の調整）
日本コーンスターチ社製コーンポールＦ３Ｆを原料に使用し、Ｔダイ加工で製造した膜厚５００μｍの澱粉エステル系生分解性フィルムを準備した。さらに、準備したフィルムの両面をコロナ処理し、フィルム表面の濡れ指数が４５ｄｙｎ／ｃｍ以上になるように調整し、基材ｃを準備した。
（粘着剤の調整）
綜研化学社製ＳＫダイン１７２０を１００質量部に対し、綜研化学社製硬化剤Ｌ−４５を１．０質量部添加し粘着剤ｃを得た。
（粘着テープの製造）
基材ｃにＫＳ−８４７Ｔ（信越化学工業社製シリコーン剥離剤）を乾燥後の塗布量が０．３ｇ／ｍ２になるように塗布し、乾燥後巻き取り、基材ｂの剥離処理品を得た（加工品Ｆ）。次に基材ｃの剥離処理した面とは反対の面に、粘着剤ｃを乾燥後の糊厚が５０μｍになるように塗布し、乾燥後巻き取り、粘着テープｅを得た。
(Comparative Example 3)
(Adjustment of base material)
A corn pole F3F manufactured by Nippon Corn Starch Co., Ltd. was used as a raw material, and a starch ester biodegradable film having a film thickness of 500 μm manufactured by T-die processing was prepared. Furthermore, the both surfaces of the prepared film were corona-treated, and adjusted so that the wetting index on the film surface was 45 dyn / cm or more to prepare a substrate c.
(Adhesive adjustment)
To 100 parts by mass of SK Dyne 1720 manufactured by Soken Chemical Co., Ltd., 1.0 part by mass of curing agent L-45 manufactured by Soken Chemical Co., Ltd. was added to obtain adhesive c.
(Manufacture of adhesive tape)
KS-847T (Shin-Etsu Chemical Co., Ltd. silicone release agent) is applied to the substrate c so that the coating amount after drying is 0.3 g / m 2 , wound after drying, and the substrate b is subjected to a release treatment product. Obtained (processed product F). Next, the adhesive c was applied to the surface opposite to the surface of the substrate c that had been peeled off so that the paste thickness after drying was 50 μm, wound up after drying, and an adhesive tape e was obtained.
本発明の生分解性シートの固定・連結に使用して気密を保持する気密用粘着テープは、施工時の作業性が良く、かつ使用期間中は目的とする固定・連結による気密保持の機能を持続し、使用後埋設された場合には土中で分解することで消滅し、従来の粘着テープに比して環境に優しく、産業上の利用可能性が高いものである。
The airtight pressure-sensitive adhesive tape that is used for fixing and connecting the biodegradable sheet of the present invention maintains airtightness, has good workability at the time of construction, and has the function of maintaining airtightness by the intended fixing and connection during the period of use. When it is sustained and buried after use, it disappears by decomposing in the soil. It is environmentally friendly compared to conventional adhesive tapes and has high industrial applicability.
Claims (2)
The pressure-sensitive adhesive tape according to claim 1, wherein a non-woven fabric layer is provided at an intermediate portion of the pressure-sensitive adhesive layer.
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| JP3938609B2 (en) * | 1997-02-25 | 2007-06-27 | 信越ポリマー株式会社 | Biodegradable adhesive tape |
| JP3719568B2 (en) * | 1997-07-07 | 2005-11-24 | 昭和高分子株式会社 | Adhesive tape |
| JP3445923B2 (en) * | 1997-09-05 | 2003-09-16 | 戸田建設株式会社 | Continuous underground wall and its construction method |
| JPH11279393A (en) * | 1998-03-31 | 1999-10-12 | Daicel Chem Ind Ltd | Biodegradable tape, packaging and packing tape, and self-adhesive tape |
| JP2002317161A (en) * | 2001-04-23 | 2002-10-31 | Koyo Kagaku Kk | Pressure-sensitive adhesive tape |
| JP2003238917A (en) * | 2002-02-22 | 2003-08-27 | Sekisui Chem Co Ltd | Adhesive double coated tape for fixing heat sink |
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