JP2006070274A - Adhesive for use in tile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive for use in tiles which is capable of giving a good external appearance without making the connecting resin at a joint part stand out at the time of fixing to a base material by way of the adhesive layer a tile unit that a plurality of tiles are arranged fixedly and connected with a connecting resin. <P>SOLUTION: The adhesive is used for the building material that the tile unit, in which a plurality sheet of tiles are arranged at a given joint interval and connected with a connecting resin, is fixed to a base material by way of a layer of said adhesive, characterized in that the above layer of said adhesive is formed with a pattern comprising a plurality of such irregular convex portions in the projection form as are formed at the time of coating the said adhesive with a roller. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elastic adhesive used at the time of tile construction.

  Conventionally, a method for arranging and fixing tiles at predetermined joint intervals via an elastic adhesive layer has been proposed. According to such a method, an adhesive is applied to a building base material with a comb, and after flattening and smoothing to form an adhesive layer having a uniform thickness, the tiles are pressed one by one and stuck. It is something to do. (For example, refer to Patent Document 1.)

  As an adhesive used in such a method, an example in which a modified silicone resin or an epoxy resin is contained as a resin component and a filler such as calcium carbonate or silica is further disclosed is disclosed. (For example, see Patent Document 2.)

On the other hand, an elastic adhesive for producing a building material panel in which a tile is bonded and fixed to a surface is disclosed. This elastic adhesive is intended for line construction, and is formulated on the premise of application on a horizontal surface and tile adhesion. (For example, see Patent Document 3 and Patent Document 4.)
JP-A-10-159304 JP-A-4-100801 JP-A-5-65469 JP-A-10-140786

  In order to apply the adhesive with a uniform thickness to the surface of the base material with a scissors such as a comb-shaped scissors, skill of a construction worker is required. Moreover, even if a person skilled in the work constructs the work, the work is heavy because it requires both the application and leveling and the trouble of sliding the scissors twice or more on the same plane.

  The adhesive intended for one line construction is intended for horizontal application and tile adhesion, so it has relatively low viscosity and has excellent leveling properties to ensure the uniformity of the coating layer. Yes. Such an adhesive is excellent in applicability, but tends to have poor tile retention immediately after application, and may require long-term curing in order to ensure sufficient adhesive strength. Therefore, it is inappropriate to use such an adhesive on a construction surface extending in the vertical direction such as a wall surface.

The present invention has been made to solve the above problems, and the object of the present invention is excellent in workability and tile retention immediately after application when a tile is attached to a construction surface extending in a vertical direction such as a wall surface. It is to provide an adhesive.

  In order to achieve the above object, the present invention provides an organic elastic adhesive used for attaching and fixing a tile on a substrate, and the surface of the elastic adhesive coating is irregularly formed by a roller. A pattern consisting of convex portions is formed, and even if the tile is pasted immediately after the coating film is formed, the tile does not peel off, and the irregular convex portions do not lose their shape until the adhesive is cured. A tile adhesive is provided.

Here, the “pattern consisting of irregular convex portions” refers to a pattern having no regularity in the arrangement of a specific convex portion and a convex portion in the vicinity thereof, excluding a pattern formed by a comb. It is a shape such as a protrusion or a small wave formed when the adhesive is pulled away from the roller during application. Further, “the shape does not disappear” means that the pattern is maintained in a state in which an external force other than gravity is not applied, and the deformation of the convex shape over time is included in the category of “maintained”. Shall.

The present invention is characterized in that a yield value obtained by a BH viscometer at 23 ° C. is 200 Pa or more. The yield value is obtained from the CASSON formula.
CASSON formula: √S = a√D + b
S: Shear stress D: Shear rate a, b: Constant where D = 0
√S = b, and b square is the yield value (S0).

  Here, the yield value is a value in the adhesive at the time of application. By setting the yield value to 200 Pa or more, it is possible to obtain an adhesive with particularly excellent tile retention immediately after application.

  In the present invention, it is possible to reduce work time and work load by applying with a roller. In addition, the surface shape of the adhesive layer is formed into the above pattern, and further, the shape is maintained so that the convex portion adheres to the tile back surface even when there is some unevenness. It is possible to sufficiently secure the adhesive strength between the tile and the tile fixed thereon. In particular, when a tile unit in which the back surfaces of a plurality of tiles are connected by a connecting member such as a resin or a net is attached, the connecting member that exists in the joint portion is in a valley portion between the convex portion and the convex portion of the adhesive layer. Since at least the lower surface is buried or a part of the connecting member existing in the joint is buried in the convex portion of the adhesive layer, the connecting member does not stand out in appearance. Therefore, it is not necessary to apply resin mortar or the like to the joints after the tile unit is attached.

Further, the present invention is characterized in that the viscosity at the time of coating is 10 to 200 Pa · s and the thixo index is 2.0 or more.
However, the viscosity is a value at 20 rpm measured by a BH viscometer No. 7 rotor at 23 ° C., and the thixo index is a viscosity at 2 rpm measured by a BH viscometer No. 7 rotor at 23 ° C. It is the value divided by the viscosity at 20 rpm.

  By setting it as the said viscosity, it becomes excellent in the applicability | paintability by a roller, and it becomes possible to maintain the pattern which consists of several irregular convex parts formed at the time of application | coating, without lose | disappearing at the time of hardening.

  In addition, according to the present invention, (A) a modified silicone resin, (B) an epoxy resin, and (C) a filler are contained, ((A) component + (B) component) / ((C) component) However, by setting it as 100/5 to 100/50, the viscosity at a high shear rate becomes low, and application by a roller becomes possible.

  Furthermore, tile retention improves by the said filler containing a three-dimensional whisker.

  ADVANTAGE OF THE INVENTION According to this invention, when sticking a tile to the construction surface extended in the orthogonal | vertical direction, such as a wall surface, it is possible to provide the adhesive excellent in construction property and tile retention property immediately after application | coating.

  Hereinafter, specific embodiments of the present invention will be described.

  The adhesive of the present invention is previously attached to a roller and transferred to the surface of a substrate. During transfer, a part of the adhesive is pulled up to the roller side due to its viscosity, whereby the above-described convex portion is formed. In such a forming method, a commercially available roller used when used for coating can be used. More specifically, a sponge roller and a sand bone roller can be suitably used when applying the adhesive described later. In addition to the method of forming the convex part at the same time as the application of the adhesive with a roller, a predetermined amount of adhesion is achieved by spraying with a comb using a comb, using a continuous extrusion device such as a caulking gun, spraying, etc. After the agent is attached to the wall, the convex portions may be formed simultaneously with spreading with a roller.

  The adhesive of the present invention exists with an average thickness of 0.5 mm or more and 3 mm or less. The coating thickness of the adhesive is calculated from the amount applied to a predetermined area and the specific gravity. On the surface of the adhesive film, a large number of convex portions such as protrusions and small waves are formed, and the height of the convex portions is not less than 0.5 mm and not more than 10 mm. Moreover, the space | interval of the convex part adjacent to each other is 1 mm or more and 30 mm or less.

  As described above, the yield value is calculated by the CASSON formula from the viscosity characteristics obtained by the cone-plate viscometer at 23 ° C. The yield value can grasp the phenomenon in a very low shear region, and the higher the value, the greater the static friction. In the present invention, by setting the yield value to 200 Pa or more, excellent resistance to peeling and tile displacement can be obtained even when a tile is attached to the wall surface immediately after application of the adhesive.

  Furthermore, roller application | coating becomes possible because the viscosity at 20 rpm measured by a BH type viscometer No. 7 rotor at 23 ° C. is 10 to 200 Pa · s. A preferred viscosity range is 30 to 120 Pa · s. In addition, when the thixo index is 2.0 or more, it is possible to achieve both the application by the roller and the shape maintaining property of the convex portion. The preferable thixo index range is 3.0 to 20, and the most preferable range is 6.0 to 10.

  The adhesive of the present invention preferably has a thixotropic property value of 40% · rpm. The viscosity property at the time of application exhibits thixotropic properties and is an index of thixotropic properties. The thixotropic characteristic value draws a hysteresis loop by increasing / decreasing the rotation speed (rpm) at a certain rate (ex.0.5 → 1 → 2.5 → 5 → 10 → 20 → 10 → 5 → 2.5 → 1 → 0.5). Obtain from the area.

  Component (A) applicable to the adhesive of the present invention; the modified silicone resin is preferably a compound containing two or more reactive silicon groups in one molecule. The reactive silicon group is a group that contains a silicon atom to which a hydrolyzable group is bonded and can be crosslinked by a silanol condensation reaction. Examples of the hydrolyzable group include a halogen atom, an alkoxyl group, an acyloxy group, an aminooxy group, a mercapto group, and the like. In particular, an alkoxyl group is easy to handle and can be suitably used.

  Component (B): Examples of the epoxy resin include epichlorohydrin / bisphenol A type epoxy resin, epichlorohydrin / bisphenol F type epoxy resin, hydrogenated bisphenol A type epoxy resin, urethane-modified epoxy resin, etc. Absent.

  Component (C): As the filler, whiskers and methylated silica are preferable. In addition, heavy calcium carbonate, light calcium carbonate, fly ash balloon, fly ash, silica, magnesium carbonate, calcium oxide, magnesium oxide Inorganic fillers such as glass balloon, diatomaceous earth, mullite, kaolin, talc, clay, mica, bentonite, aluminum silicate and zinc oxide, and inorganic pigments such as titania and carbon can be suitably used.

  The whisker can be suitably used to improve tile retention. In particular, a three-dimensional whisker having a three-dimensional structure is preferable. Examples of the three-dimensional whiskers include zinc oxide whiskers having a tetrapot shape. The three-dimensional whisker is known to have an effect of increasing the dimensional stability of the resin molded product, but is considered to have a resistance to deformation even in a liquid.

  Silica that has been subjected to methylation treatment refers to finely divided silica that has been hydrophobized with a methyl group, silicone oil, or the like, and is used to improve thixotropy.

  The above components are characterized in that ((A) component + (B) component) / ((C) component) is 100/5 to 100/50 in weight ratio. If the component (C) is less than 5 parts by weight, the effect of adding the filler is small, and if it exceeds 50 parts by weight, the viscosity becomes too high. A more preferable range is 100/5 to 100/25.

  Other components include aminosilanes and other silicone compounds containing functional groups that can react with epoxy groups and reactive silicon groups in the molecule, epoxy resin curing agents, organotin silicone curing agents, light stabilizers, and UV absorption. An agent, an antioxidant and the like can be added as appropriate.

  Examples of the base material to which the adhesive of the present invention can be applied include wall materials such as siding materials and wall panels in addition to the existing walls and inner and outer walls. Although it does not specifically limit, such as a material and a wood type base material, it can utilize especially suitably in the existing wall.

Depending on the properties of the substrate surface, an undercoat material may be used in combination before application of the adhesive. As the undercoat material, a fine elastic filler containing acrylic rubber and calcium carbonate can be suitably used. It can be used to complement the adhesion between the base material and the adhesive, or to smooth the base material when the unevenness of the base material is large and it is difficult to secure the adhesion area of the adhesive to the tile. . By selecting an undercoat material according to the type of base material, not only can it cope with various base material repairs, but it is also possible to add the elasticity of the base material to the elasticity of the adhesive, resulting in adhesive strength and seismic resistance. It is also possible to improve the performance.

  The tiles are made of ceramics made of ceramic or glass, and can be used with either glazed tiles or plain tiles. For example, it can be obtained by producing granulated powder, followed by dry press molding in a mold, and applying a glaze on it as needed and baking it. In addition, lightweight tiles such as fly ash balloons, shirasu balloons, glass balloons and the like, and lightweight tiles such as silicon carbide added to the substrate can also be suitably used.

  It is desirable that the back surface of the tile has no back foot or has a back foot height of less than 1 mm. By doing so, it becomes possible for an adhesive agent to contact | adhere over substantially the whole back surface of a tile, and sufficient adhesive strength is ensured. A more preferable upper limit of the back foot height is 0.5 mm.

  Further, a photocatalytic layer may be provided on the tile surface. By doing so, self-cleaning and antibacterial properties can be imparted to the tile surface.

  These tiles are tile units such as a unit in which the tile surface is integrated with a connecting sheet such as kraft paper, a unit in which the back side of the tile is connected with acrylic resin, etc., or a net type unit in which multiple tiles are arranged and fixed on the net. Can be used. The tile unit is formed by joining adjacent tiles partially with a connecting resin at the tile back surface and / or the tile side surface, and a known one can be used.

The adhesive composition which consists of the main ingredient and hardening | curing agent of each composition shown in Table 1 was prepared, and this main ingredient and hardening | curing agent were mixed. Then, (a) viscosity at the time of mixing, and thixo index, (b) yield value, and thixotropic characteristic value, (c) paintability, (d) presence / absence of convex portion formation, and (e) tile retention were evaluated. . The results are shown in Table 1.
(A) Viscosity at the time of mixing and thixo index The viscosity at 2 rpm and 20 rpm measured by a BH type viscometer (manufactured by Tokyo Keiki Co., Ltd.) No. 7 rotor at 23 ° C. is measured. It is the value divided by the viscosity at the time.
(B) Yield value and thixotropic characteristic value 0.5, 1, 2.5, 5, measured at a cone plate type viscometer (manufactured by Toki Sangyo Co., Ltd., R500) at 23 ° C. A CASSON plot was created from the shear stress and shear rate at 10 and 20 rpm, and the yield value was calculated therefrom.
The thixotropic characteristic value was calculated from the area of the hysteresis loop obtained by measuring the viscosity by increasing and decreasing the rotational speed of the cone-plate viscometer.
(C) Paintability On a board extending in the vertical direction, an adhesive was applied using a clavicle roller so as to have an application amount of 700 g / m2, and workability was evaluated.
(D) Presence / absence of convex portion formation Whether the convex portion was formed on the surface of the coating film after application of the adhesive was visually evaluated.
(E) Tile Retention Property A tile having a size of 45 mm × 145 mm × 8 mm and a weight of 60 to 62 g was adhered to the surface of the coating film after application of the adhesive, and the retention property of the tile at the initial adhesion was visually evaluated.

The contents of each compounding agent in the table are as follows.
Silicon modified polyether resin; SAT350 (manufactured by Kaneka Corporation)
Epoxy resin; AER260 (Asahi Kasei Corporation)
Zinc oxide whisker; Panatetra WZ-0501 (Matsushita Sangyo Information Equipment Co., Ltd.)
Hydrophobic fine silica (methyl-treated); R-974 (manufactured by Nippon Aerosil Co., Ltd.)
Hydrophobic fine silica (dimethylsilicone treatment); RY200S (manufactured by Nippon Aerosil Co., Ltd.)
Vinylsilane; KBM1003 (manufactured by Shin-Etsu Chemical Co., Ltd.)
Fly ash balloon; Cenolite YK (manufactured by Sakai Kogyo Co., Ltd.)
Light calcium carbonate (1); CCR (Shiraishi Calcium)
Light calcium carbonate (2); Calfine 40N (manufactured by Maruo Calcium)
Hindered amine light stabilizer; LA62 (Asahi Denka Kogyo Co., Ltd.)
Benzotriazole ultraviolet absorber; LA32 (Asahi Denka Kogyo Co., Ltd.)
Phenolic antioxidant; A0-60 (Asahi Denka Kogyo Co., Ltd.)
Tertiary amine (2,4,6-tris (dimethylaminomethyl) phenol); TAP (manufactured by Kayaku Akzo)
Aminosilane: KBM603 (manufactured by Shin-Etsu Chemical Co., Ltd.)
Tin-based catalyst; SCAT-1 (manufactured by Sansha Co., Ltd.)
Carbon black for coloring; 400R (Cabot)

As is apparent from Table 1, the adhesives of the examples had good paintability, convex portion formation, and tile retention. On the other hand, in the comparative example, the tile retention could not be satisfied.

Claims (1)

An organic elastic adhesive used for attaching and fixing tiles on a substrate,
On the surface of the elastic adhesive film, a pattern composed of a plurality of irregular protrusions is formed by a roller.
Even if the tile is pasted immediately after the coating film formation, the tile does not peel off,
The plurality of irregular protrusions are characterized in that the shape does not disappear until the adhesive is cured,
Tile adhesive.