KR20010080143A - Adhesive sheets and adhesive structures - Google Patents

Abstract

The present invention relates to an adhesive sheet that does not exhibit expansion when adhered to an adherend of concrete or mortar. The adhesive sheet has a substrate 4 and an adhesive layer 2 disposed on one main surface of the substrate and having a recessed portion on the adhesive surface, and the adhered surface of the recessed portion and the adherend in a state of being bonded to the adherend. A passageway is formed which is surrounded by and communicates with the outside. The adhesive layer comprises a rubbery adhesive polymer and is also fixed on one main surface of the substrate via the primer layer 3.

Description

Adhesive sheet and adhesive structure {ADHESIVE SHEETS AND ADHESIVE STRUCTURES}

When an adhesive sheet is attached to an adherend (such as a wall of a building or a structure) made of a material such as mortar or concrete installed outdoors, the following problems arise. That is, since mortar and concrete are absorbent porous bodies, when an adhesive sheet is attached to it, outgassing, such as water vapor which has penetrated the inside of the adherend from the outside, leaches to the adhesive interface, resulting in poor appearance due to expansion of the adhesive sheet. Therefore, when the adhesive sheet is applied to an outdoor concrete adherend, a base treatment such as a seal or a primer is performed on the adherend surface to prevent leaching of outgas from the adherend to the adhesive interface. However, such basic treatment is costly and time-consuming, and workability (workability) is reduced.

On the other hand, the adhesive sheet which can prevent the outgas from a to-be-adhered body to stay between the to-be-adhered body and the contact bonding layer of an adhesive sheet is also used, without requiring the above-mentioned basic process. For example, an adhesive sheet including an adhesive layer having a concave-convex structure on an adhesive surface is disclosed in Japanese Patent Laid-Open Nos. 6-287525, 8-113768, 9-157606, and the like. These adhesive layers are formed by applying a mixture adhesive of an elastic microsphere and an adhesive binder, and have irregularities on the adhesive surface. When the adhesive sheet adheres to the adherend, such uneven surface is surrounded by the recess and the adherend of the adherend to form a passage communicating with the outside. Through this passage, the outgas from the adherend can be pushed out, thereby preventing appearance defects due to expansion.

Another example is a pressure-sensitive adhesive sheet disclosed in Registered Utility Model No. 2503717. This gives the concavo-convex structure to the adhesive layer surface using the release paper which performed the embossing process, and can obtain the same effect as the case where the above-mentioned elastic fine particle is used.

On the other hand, although not intended for outdoor use, Japanese Patent Application Laid-Open No. Hei 6-108605 discloses an adhesive sheet having an adhesive layer containing a rubbery adhesive polymer and used around water (such as an environment or place where water is always in contact with water) such as a tile surface of a bathroom. . The adhesive layer is excellent in water-resistant adhesion, even when used around the water can maintain a high adhesion for a long time. In addition, since outgas does not generate | occur | produce normally from a tile surface, this publication does not have the technique regarding prevention of expansion as mentioned above.

The present invention particularly relates to an improvement of an outdoor adhesive sheet suitable as a marking film for concrete or mortar, and an adhesive structure comprising an adherend having an adherend surface made of concrete or mortar, and an adhesive sheet adhered to the adherend surface of the adherend. It is about improvement of.

1 is a cross-sectional view showing one preferred form of an adhesive sheet according to the present invention.

2 is a cross-sectional view showing another preferred form of the adhesive structure according to the present invention.

Detailed Description of the Preferred Embodiments of the Invention

In order to achieve the above object, the present invention is (1) the substrate and (2) the recessed portion disposed on one main surface of the substrate and having an adhesive layer having a recessed portion on the adhesive surface, and adhered to the adherend. And an adhesive sheet surrounded by an adhered surface of the adherend and communicating with the outside, wherein the adhesive layer comprises a rubber-based adhesive polymer and is fixed on one main surface of the substrate through a primer layer. An adhesive sheet is provided.

Referring to FIGS. 1 and 2, the adhesive sheet 1 of the present invention has an adhesive layer having a concave portion 8 on the adhesive surface and a plurality of convex portions 7 outlined by the concave portion 8. (2), and in the state of being adhered to the adherend 6 on the top surface of the convex portion 7, surrounded by the recess 8 and the adherend surface (adhered surface) 9 and communicating with the outside. A plurality of passages are formed. Thereby, the outgas from the adherend 6 can be effectively prevented from remaining between the adherend 6 and the adhesive sheet 1. (Out gas monoacid action). In addition, since the adhesive layer 2 contains a rubber-based adhesive polymer, the water-resistant adhesive force is effectively increased, and peeling at the adhesive layer-to-adhesive interface of ② can be effectively prevented. Further, since the adhesive layer 2 is fixed on one main surface of the substrate 4 via the primer layer 3, the degree of expansion of the adhesive sheet 1 due to peeling at the substrate-adhesive layer interface of the above ① Can be effectively prevented.

Therefore, due to these synergistic effects, both of the above ① and ② are applied even when the outdoor concrete adherend 6 is applied to the adherend 9 having a relatively large area (for example, about 1 m ² or more). Expansion of the adhesive sheet 1 which originates can be prevented effectively.

The adherend 6 to which the adhesive sheet 1 of the present invention is bonded is not particularly limited. However, the adhesive sheet is particularly suitable for forming an adhesive structure 5 including an adherend 6 (for example, a wall of a building or structure, etc.) made of a material such as mortar or concrete installed outdoors. This is because even when out gas such as water vapor that has penetrated into the mortar or concrete leaches into the adhesive interface, poor appearance due to expansion of the adhesive sheet 1 can be effectively prevented.

Therefore, when the adhesive sheet 1 is applied to such a to-be-adhered body 6, workability (workability) can be improved, without having to perform a base treatment, such as a seal and a primer, on the to-be-adhered body surface.

Adhesive sheet

One suitable form of the adhesive sheet of the present invention,

A: flexible base film as a base material,

B: It adheres to one main surface of the base film through a primer layer, and to the adhesive surface on the opposite side to the adhesion surface,

Unevenness comprising a plurality of convex portions adhering to the adherend and (ii) convex portions adjacent to each other, and comprising a continuous groove-shaped concave portion communicating with the outside in a state where the adherend and the convex portion are in contact with each other. And an adhesive layer having a structure.

The adhesive layer of the adhesive sheet of this invention contains a rubber-based adhesive polymer and a hardening | curing agent as needed. The thickness of the adhesive layer is not particularly limited as long as the effects of the present invention are not impaired, but is usually 30 to 200 m, preferably 35 to 150 m. Since the adhesive layer of the adhesive sheet of this invention contains an adhesive polymer as an adhesive component, it can use it like a normal adhesive sheet. In addition, even if bubbles are generated between the adhesive surface and the adhered surface by the action of the recessed portion of the adhesive layer, air can be sent to the outside through the passage.

Rubber-based adhesive polymer

A rubber-based adhesive polymer (hereinafter also referred to simply as an "adhesive polymer") is made of a rubber-based polymer and exhibits adhesiveness at room temperature (about 25 ° C). Examples of the rubber polymer include polybutadiene, polyisoprene, nitrile-butadiene copolymer (NBR), styrene-butadiene copolymer (SBR), ethylene-propylene copolymer (EPDM), polychloroprene, fluorine rubber polymer, and silicone Polymers (eg, polysiloxane-urea block copolymers). An adhesive polymer consists of these rubber type polymers individually by 1 type, or 2 or more types of mixtures. Of these, nitrile-butadiene copolymers, styrene-butadiene copolymers or mixtures thereof are suitable. It is because water-resistant adhesive force is high and shape maintenance of the recessed part of an adhesive layer is also easy. As a specific example of such a rubber-based polymer, butadiene-based rubber "(article name) GR1035: NBR / SBR = 75: 25 (weight ratio) and solid content about 33 weight%" manufactured by Rikidine Co., Ltd. may be mentioned. .

The molecular weight of an adhesive polymer should just be a range in which predetermined | prescribed adhesive force is exhibited, and a weight average molecular weight is the range of 10,000-100,000 normally. The adhesive polymer can use both a solution type (the polymer is dissolved in a solvent) and an emulsion type (the polymer is dispersed and contained in a solvent), and these can also be mixed and used. Moreover, you may crosslink an adhesive polymer, and in that case, the crosslinking agent containing an isocyanate compound, a melamine compound, a poly (meth) acrylate compound, etc. is added.

The proportion of the rubber-based adhesive polymer in the whole adhesive layer is usually 55% by weight or more, preferably 60 to 100% by weight. If the content of the rubber-based viscous polymer is too small, there is a fear that the water-resistant adhesion decreases, and that peeling at the adhesive layer-to-adherent interface cannot be effectively prevented. A tackifier can also be used with an adhesive polymer like a conventionally well-known adhesive sheet. Moreover, as long as the effect of this invention is not impaired, the said adhesive polymer may be curable by heat or radiation. The tacky polymer may be cured before and / or after adhering to the adherend.

It is preferable that an adhesive layer contains a hardening | curing agent besides a rubber adhesive polymer preferably. As a result, the shape retainability of the concave-convex structure can be effectively increased even after pasting to the adherend. This is because if the uneven structure (that is, the passage communicating with the outside) is lost after a predetermined time is applied to the adherend, the outgas monoxide effect may be lowered.

Moreover, as a hardening | curing agent of an adhesive layer, it is suitable to mix and use a crosslinkable polymer and a crosslinking agent with an adhesive polymer. Thereby, the dimensional stability (shape retention of an adhesive layer) with respect to a change of humidity can be improved. The crosslinkable polymer is a crosslinkable polymer, and may be used alone or in combination with a crosslinking agent for a crosslinkable polymer. Moreover, when an adhesive polymer can be crosslinked, it is also possible to use the crosslinking agent for adhesive polymers as a hardening | curing agent. The proportion of the curing agent in the entire adhesive layer is usually 30% by weight or less, preferably 0.1 to 20% by weight, more preferably 0.5 to 15% by weight. When there are too few hardening agents, there exists a possibility that the shape retention of an adhesive layer may not be improved, and when there are too many hardening agents, there exists a possibility that adhesive force may fall.

The curing agent is not particularly limited as long as the shape retention of the adhesive layer can be improved. For example, a crosslinkable polymer containing polyol, polyacrylate, polyurethane, polyolefin, epoxy resin, or the like can be used. As the crosslinking agent, polyisocyanates, melamine compounds, dicyandiamides, polyamines and the like can be used. For example, a curing agent used in combination with a nitrile-butadiene-based copolymer, a styrene-butadiene-based copolymer, or a mixture thereof is preferably a mixture of a polyol and a polyisocyanate. This is one of the best combinations that can effectively increase both the water-resistant adhesion and the shape retention of the adhesive layer. In addition, in order to promote crosslinking of the polymer, it is preferable to use energy such as heat or radiation. It is also possible to crosslink the polymer by directly reacting the reaction points in the polymer molecule.

In addition, the adhesive layer may be cured before and / or after adhering to the adherend. However, when using an adhesive sheet like a conventional adhesive sheet, and performing hardening of an adhesive layer before adhering to a to-be-adhered body, care should be taken not to lose the adhesiveness of an adhesive layer. In this case, the cured adhesive layer may be made to exhibit adhesiveness by heating.

The uneven structure including the recessed part (groove part) of an adhesive surface is not specifically limited unless the effect of this invention is impaired. The uneven structure is formed of, for example, a convex portion having a horizontal cross section (cross section parallel to the adhesive surface) having a polygonal, circular, or similar shape, such as a quadrangle, and a groove portion continuously formed to surround the periphery of these convex portions. The shape of the vertical cross section (cross section perpendicular to the bonding surface) of the convex portion may employ a quadrangle, a semicircle, or the like, such as a trapezoid or a rectangle.

The height of the convex portion (the depth of the concave portion or the groove portion) is usually in the range of 5 to 200 µm, preferably 10 to 100 µm. If the height of the convex portion is too small, there is a possibility that it is difficult to remove the air bubbles wound between the adhesive surface and the adhered surface. On the contrary, if the height is too large, the appearance of the adhesive sheet after completion of the pasting may be damaged. The maximum width (maximum horizontal dimension) of the convex portion is usually in the range of 0.1 to 10 mm. On the other hand, the maximum width (maximum distance between adjacent convex portions) of the groove portion is usually in the range of 0.05 to 1 mm.

The convex portions are preferably arranged regularly. For example, the convex portion is disposed approximately at the center of each mass (approximately square) of the checkered geometry. In this case, a groove portion is formed along the checkerboard line, and at the outer peripheral end of the adhesive sheet attached to the adherend, at least one (preferably plural) groove portion has an opening so as to communicate with the outside. It is also possible to arrange the plurality of straight grooves so as to intersect with each other at an angle of about 60 degrees. Further, the plurality of linear grooves may be arranged substantially parallel to each other without intersecting with each other. In addition, it is preferable that all the dimensions of each convex part and a groove part are substantially the same.

In order to form an unevenness | corrugation on the adhesive surface of an adhesive layer, microparticles | fine-particles can also be used. As such fine particles, rubber particles, pressure-sensitive adhesive particles, glass beads, hard plastic particles, and the like can be used. In such a case, the fine particles are mixed with a matrix component containing an adhesive polymer to prepare a coating liquid, and an adhesive layer made of the coating film of the coating liquid is used. The average volume diameter of microparticles | fine-particles is the range of 10-300 micrometers normally. "Volume average diameter" is a value determined by measuring 1000 fine particles using an image processing apparatus by an optical microscope, and applying the measured value to the following formula (1).

In the formula, di is the diameter (micrometer) of the i-th size of microparticles | fine-particles, and ni is the number of microspheres whose diameter is di.

Content of the microparticles | fine-particles contained in an adhesive layer is 10-80 weight part normally with respect to 100 weight part of adhesive polymers. In addition, the microparticles | fine-particles can use the hollow sphere which has medium density or one or more pores.

The contact area between the adhesive layer (convex part) and the adherend is not particularly limited as long as the effects of the present invention are not impaired. However, when a contact area is defined using the ratio of the contact area at the time of measuring an adhesive sheet to a flat adherend, it is usually 50 to 99%, preferably 70 to 97%, particularly preferably 80 to 95%. to be. If the contact area is too small, the adhesive force is lowered. On the contrary, if the contact area is too large, the monogas effect of the outgas is lowered, and there is a fear that peeling at the adhesive layer-to-adherent interface cannot be prevented.

In addition, the measurement of the said contact area is carried out specifically as follows. First, a flat glass plate surface such as slide glass and the adhesive surface of the adhesive layer of the adhesive sheet are brought into close contact with each other, and then a sample for measurement is prepared by reciprocating and pressing the 2 kg roller once. At the time of crimping | bonding, the width | variety of an adhesive sheet is made into 2 cm so that linear pressure may be 1 kg / cm, and the rolling direction of a roller is made into a longitudinal direction. When white light is reflected on the glass plate on the side to which the sheet is not attached and observed through the polarizing plate, the area where the convex portion and the glass surface are in contact appears black, and the non-contact area appears white. Photographing such an observation state, the area of the contact area and the area of the entire observation field (corresponding to the external contact area) are measured, and the ratio (area of the contact area / area of the entire observation field) is expressed as a percentage. Let "contact area" be. Such operation can be performed using an optical microscope equipped with a conventional polaroid camera. In this case, the area of the observation visual field is usually 1 cm ² . In addition, the surface roughness Ra of the glass plate used is 0.1 micrometer or less.

Although a base material is not specifically limited, Usually, what is used for the base film of a conventional adhesive sheet, and what has flexibility is used. For example, paper, a metal film, a plastic film can be used. As the plastic, synthetic polymers such as polyvinyl chloride, polyester (PET), polyurethane, polyacrylate, and fluorine-based polymer can be used. The substrate may transmit visible light and ultraviolet rays, may be colored, or may be decorated by printing or the like. Moreover, in order to provide the metallic glossiness external appearance, the metal vapor deposition film may be provided. Moreover, in order to provide an optical function to an adhesive sheet, a polarizing film, a dielectric reflective film, a retroreflective film, a prism film, a fluorescent film, a film type electroluminescent element, etc. can also be used as a base material.

The base material may be comprised from two or more different layers. For example, it may include a base layer disposed on the adhesive layer side, and an antifouling film layer disposed on the outermost surface side. As the base layer, a material (polyvinyl chloride, polymethyl methacrylate, etc.) having good adhesion to the adhesive layer can be used. As the antifouling film, a film containing a fluorine-based polymer (polyvinylidene fluoride or the like) or a film carrying a photocatalyst layer can be used.

The thickness of a base material is 10-500 micrometers normally. The primer layer is provided in the surface of the side which forms the contact bonding layer of a base material as mentioned later.

As the primer layer, a coating film containing a polymer having affinity for both the substrate and the adhesive layer can be used. For example, when a base material contains PVC (polyvinyl chloride), it is suitable that a coating film contains an acryl-type polymer. In this case, the adhesive polymer is preferably a nitrile-butadiene copolymer, a styrene-butadiene copolymer or a mixture thereof. In addition, vinyl chloride type copolymers, such as a vinyl chloride-vinyl acetate copolymer, polyurethane, polyester, etc. can also be used.

As a specific example of the material of a primer layer, "(brand name) polymer NK350: modified acrylic polymer" by Nippon Shokubai Co., Ltd., and "(brand name) VYHH: vinyl chloride-vinyl acetate copolymer manufactured by Union Carbide Co., Ltd. are mentioned. And "(brand name) acryloid B82: acrylic polymer" by R & H (Rom & Haas) Co., Ltd. are mentioned as an example.

A primer layer can be apply | coated and formed in the surface of a base material by normal coating means. The thickness of the primer layer is not particularly limited as long as the effects of the present invention are not impaired. The thickness of the primer layer is usually 0.1 to 30 µm, preferably 0.2 to 20 µm.

Manufacturing method of adhesive sheet

The adhesive sheet of this invention is manufactured as follows, for example. First, a liner having a structure corresponding to the negative of the uneven structure desired to be formed on the adhesive surface on one surface is prepared. The coating liquid containing an adhesive polymer and the hardening | curing agent added as needed is apply | coated to the surface which has the negative structure of this liner, and it solidifies (for example, drying and hardening, etc.), and forms an adhesive layer. Thereby, the adhesive layer which has an uneven structure corresponded to the positive structure along the structural surface corresponded to the said negative of the said liner can be formed.

Next, the surface which is not in contact with the liner of the adhesive layer (usually a substantially flat surface) and the surface on which the primer layer of the substrate is formed are brought into contact with each other, and the substrate and the adhesive layer are brought into close contact with each other using a pressure bonding means such as a roller. Obtain a mounting adhesive sheet. When using an adhesive sheet, a liner is removed and it adheres to a to-be-adhered body like a conventional adhesive sheet.

In addition, an adhesive sheet can also be manufactured by another method. First, a liner, an adhesive layer, and a base film (base material) are laminated | stacked in this order, and the laminated body which consists of these three layers is manufactured. Next, the embossing tool is pressed by the liner side of this laminated body, and it processes so that an adhesive layer (adhesion surface) may have a predetermined uneven structure. At least the liner is made of a material (e.g., a resin film) capable of plastic deformation by embossing. In addition, an adhesive layer having a convex portion formed by mixing the fine particles with the adhesive polymer and formed from the fine particles can also be used.

Hereinafter, the specific manufacturing example of the adhesive sheet of this invention is demonstrated.

First, the coating liquid for forming an adhesive layer is prepared. This coating liquid is usually prepared by mixing an adhesive polymer, a curing agent, a solvent, and various additives with a mixing device such as a homo mixer or planetary mixer, if necessary, and dissolving or dispersing each material uniformly. The coating solution thus prepared is applied onto the liner and dried to form an adhesive layer. As a coating means, well-known means, such as a knife coater, a roll coater, a die coater, and a bar coater, can be used. In addition, drying is normally performed at the temperature of 60-180 degreeC. The drying time is usually from several tens of seconds to several minutes.

As a solvent, water or an organic solvent can be used, for example. It is also possible to add a co-solvent partially compatible with water. Useful co-solvents include, for example, alkylene glycol monoalkyl ether esters such as 3-methyl-3-methoxy butyl acetate.

In addition, a conventionally well-known additive can be added to the coating liquid for adhesive layers unless the effect of this invention is impaired. For example, inorganic particles, such as a viscosity modifier, an antifoamer, a leveling agent, a ultraviolet absorber, antioxidant, a pigment, an antibacterial agent, and glass beads, an elastic microsphere, etc. are mentioned.

The liner is usually formed of a paper, a plastic film, or a film in which both are laminated. The liner having the above-mentioned negative structure is formed by transferring the uneven structure corresponding to the negative shape to the film surface by pressing the pressure welding tool having a positive shape on the flat surface of the film, for example. At the time of pressure welding, the tool may be heated. The positive shape usually has the same shape and the same dimensions as the uneven structure to be formed on the adhesive surface. In addition, a flowable material containing plastic is introduced into a mold having a positive shape, the material is solidified on the mold, and then the mold is removed to obtain a liner having an uneven structure corresponding to the negative shape. The uneven structure surface of the liner may be subjected to peeling treatment such as silicon treatment as necessary. In addition, when the said plastic is polyolefin, peeling process can also be abbreviate | omitted.

Usually, the said coating liquid is apply | coated and dried on the uneven structure surface of the said liner, a liner attachment adhesive layer is formed, this adhesive layer and a base film (base material) are laminated | stacked, and an adhesive sheet is formed. At this time, the liner mounting adhesive layer and the primer mounting base film are laminated such that the primer surface of the adhesive layer and the base film is in close contact.

A base film with a primer is prepared by preparing a coating liquid containing a polymer for a primer, and applying the coating liquid on one main surface of the base film to form a primer layer. Preparation and application | coating of the coating liquid for primers follow the case of the said contact bonding layer.

Further, the concave-convex liner may be press-contacted to an adhesive layer having a substantially flat adhesive surface formed by applying a coating liquid for an adhesive layer on the primer surface of the primer-mounted base film to form an adhesive surface having an uneven structure.

Expansion of the adhesive sheet in the case of construction (adhesion) on a relatively large area (eg, about 1 m ² ) of the adherend of an outdoor concrete adherend only prevents outgassing from remaining between the adherend and the adhesive sheet. It turns out to be insufficient. Usually, such expansion occurs due to peeling at the interface between the substrate and the adhesive layer of the adhesive sheet and peeling at the interface between the adhesive layer and the adherend surface of the adhesive sheet.

Further, only by increasing the water resistance of the adhesive layer having the uneven surface, peeling at the adhesive layer-adhesive interface of ② can be effectively prevented, but expansion of the adhesive sheet due to peeling at the substrate-adhesive layer interface of ① above. Cannot be prevented.

Accordingly, an object of the present invention is to effectively expand the adhesive sheet due to both of the above ① and ② even when the outdoor concrete adherend is applied to a relatively large area (for example, about 1 m ² or more). It is providing the adhesive sheet which can be prevented.

Example 1

First, a 100 µm thick vinyl chloride film was prepared as a base film (base material). This base film was produced by the casting method from a vinyl chloride homopolymer solution. On one main surface of this base film, the coating liquid for primers was apply | coated using the gravure roll coater, and it dried at 65 degreeC for about 1 minute, and produced the base film with a primer. This coating liquid was prepared by diluting the above-mentioned "(product name) NK350" until the non-volatile content concentration became 15 weight%.

On the other hand, the liner mounting adhesive layer was manufactured as follows.

The concave-convex structure of the liner used in this example had a structure arranged continuously along a checkered line so that a plurality of projecting lines corresponding to the groove portion to be formed on the adhesive surface intersect with each other.

The height of the protruding line was 1.7 µm, and the maximum distance (distance between the bottom faces of the protruding lines) between adjacent protruding lines was 1.2 mm. Moreover, the vertical cross-sectional shape of the recessed part enclosed by the protrusion line was substantially trapezoidal, and the shape of the convex part of the contact bonding layer was substantially trapezoidal in shape correspondingly.

The coating liquid for the adhesive layer was mixed with 100 parts by weight of the adhesive polymer (described above (`` Product Name) GR1035 ''), and 4 parts by weight of the curing agent (`` Product Name '' Acid Paster HD739D: Polyol / isocyanate-based curing agent manufactured by Rikidine Co., Ltd.). This coating solution was applied to the uneven structure surface of the liner, and dried at 65 ° C. for 3 minutes and at 95 ° C. for 3 minutes to form an adhesive layer.The thickness of the adhesive layer after drying (up to the height of the convex portion) was about 50 degrees. Μm.

Finally, the primer surface of the primer-mounted base film obtained as described above and the surface of the adhesive layer of the adhesive layer mounting liner are brought into contact with each other using a roller to press-contact them, and the adhesive layer and the primer layer are brought into close contact with each other to prepare the adhesive sheet of this embodiment. Produced. Continuous grooves were formed on the adhesive surface of the adhesive layer, and the contact area measured by the following method was about 92%. Moreover, the adhesive layer had appropriate adhesiveness like the adhesive layer of a normal adhesive sheet.

Contact area

Adhesive sheet (width) which removed liner to flat surface of slide glass (Matsunami Glass Industry Co., Ltd. product, MICRO SLIDE GLASS white polishing No.1) of 76mm (length) * 26mm (width) * 1mm (thickness) The adhesive surface of 2 cm x 5 cm) was brought into close contact with each other, and a 2 kg roller having a width of about 4.5 cm was reciprocated once in the longitudinal direction and pressed, and was measured according to the method described above. Ra of the flat surface of this slide glass was about 0.001 micrometer.

The adhesive sheet of this example was evaluated as follows.

Normal and water resistant adhesion

An adhesive sheet cut to 150 mm x 25 mm was attached to a mortar plate (150 mm x 70 mm x 10 mm) manufactured by Nihon Test Panel Co., Ltd. under conditions of 20 ° C and 65% RH, and left for 48 hours under the same conditions. The peeling force after was measured. Peeling rate was 300 mm / min, and peeling angle was 180 degrees. The adhesive force in the normal state to the mortar plate of the adhesive sheet of this example was about 2.6 kgf / inch.

On the other hand, the adhesive sheet attached to the mortar plate as described above was cured at room temperature for 24 hours, then immersed in water at 40 ° C. for 7 days, and then left to stand at 20 ° C. and 65% RH for 1 hour. The adhesive force (waterproof adhesive force) measured as mentioned above was about 1.1 kgf / inch.

Explosion Resistance Test

The adhesive sheet having a planar dimension of 1 m × 1 m was bonded to the mortar plate under the conditions of 20 ° C. and 65% RH for 24 hours at room temperature, immersed in water at 40 ° C. for 7 days, and then expansion occurred. Whether or not was observed. As a result, the expansion in the adhesive sheet of this example was 5% or less of the total area.

Example 2

As the coating liquid for primer, the solution which mixed the above-mentioned "(product name) VYHH" and "(product name) acryloid B82" by weight ratio 4: 1 in methyl ethyl ketone (non-volatile content concentration = 25 weight%) is used. And the adhesive sheet of this Example was produced like Example 1 except having made drying conditions into about 1 minute at 65 degreeC, and about 1 minute at 120 degreeC. The contact area of the adhesive layer measured in the same manner as in Example 1 was about 91%.

In addition, the adhesive force in the steady state measured in the same manner as in Example 1 was about 2.3 kgf / inch, and the water resistant adhesive force was about 0.9 kgf / inch. In addition, as a result of the expansion resistance test, expansion was hardly observed (expansion rate is 5% or less of the total area).

Comparative Example 1

The adhesive sheet of this comparative example was produced like Example 1 except having changed the liner into "(product name) KGM11S" of Lintec Corporation. The adhesive surface of the adhesive layer was flat and the contact area was almost 100%.

In addition, the normal state adhesive force measured in the same manner as in Example 1 was about 3.2 kgf / inch, and the water resistant adhesive force was about 0.5 kgf / inch. As a result of the expansion resistance test, expansion due to peeling at the interface between the base film and the adhesive layer can be effectively prevented, but expansion due to floating of the adhesive layer from the mortar plate was observed almost at the entire surface of the sheet.

Comparative Example 2

The adhesive sheet of this comparative example was produced like Example 2 except having changed the liner into "(product name) KGM11S" of Lintec Corporation. The adhesive surface of the adhesive layer was flat and the contact area was almost 100%.

In addition, the normal state adhesive force measured in the same manner as in Example 1 was about 2.4 kgf / inch, and the water resistant adhesive force was about 0.7 kgf / inch. As a result of the expansion resistance test, expansion due to peeling at the interface between the base film and the adhesive layer could be effectively prevented, but expansion due to floating of the adhesive layer from the mortar plate was observed almost at the entire surface of the sheet.

Comparative Example 3

Except not using a primer layer, it carried out similarly to Example 1, and formed the adhesive sheet of this comparative example.

In addition, the normal state adhesive force measured in the same manner as in Example 1 was about 1.9 kgf / inch, and the water resistant adhesive force was about 0.9 kgf / inch. As a result of the expansion resistance test, the expansion ratio in the adhesive sheet of the present comparative example was about 30% of the total area, and about 70% of the expansion was due to peeling at the interface between the base film and the adhesive layer.

Claims (4)

(1) the base material, (2) an adhesive layer disposed on one main surface of the substrate and having a recessed portion in the bonding surface; Including, An adhesive sheet in which a passage communicating with the outside is formed in a state of being adhered to an adherend and surrounded by the concave portion and the adherend of the adherend, The adhesive layer comprises a rubber-based adhesive polymer, characterized in that the adhesive sheet is fixed on one main surface of the substrate via a primer layer. (a) an adherend having an adherend made of concrete or mortar, (b) the adhesive sheet of claim 1 bonded to the adherend of the adherend through the adhesive layer; Including, The adhesive sheet is surrounded by the concave portion and the adhered surface and a passage communicating with the outside is formed. The adhesive sheet according to claim 1, wherein the expansion rate when immersed in water at 40 ° C. for 7 days is about 5% or less. The adhesive sheet according to claim 1, which is adhered to an adherend selected from the group consisting of concrete or mortar.