JP6803112B2 - Extruded cement board tile peeling prevention method - Google Patents

Description

In the present invention, tiles attached to an extruded cement plate installed on the outer wall of an existing building are peeled off from the extruded cement plate due to vibration such as an earthquake or deterioration of the tile adhesive layer over time and fall to the ground or the like. The present invention relates to a tile exfoliation prevention method for extruded cement boards.

Conventionally, in a concrete building, tiles may be attached to the outer skin surface of concrete for the purpose of effectively preventing the neutralization of concrete and imparting design. However, since tiles are often attached to the concrete outer skin using cement mortar as the main component, due to the passage of automobiles, earthquakes, vibrations caused by wind, repeated cooling and heating of the attached mortar, and aging deterioration due to moisture, etc. The tile may peel off from the concrete outer skin and fall to the ground.

In order to prevent this, a construction method of an outer wall for a building and the outer wall thereof have been proposed (Patent Document 1). The construction method of the outer wall for a building is to apply a thin layer of latex mortar as a base material to the surface of a portion of the outer wall for a building in which tiles are arranged on the surface of the outer wall of the foundation and where the tiles are peeled off due to floating, and then. A net is placed on the surface of the net, then a pin is driven into the foundation outer wall from above the net, and the net is pressed by a single flange extending around the head of the net, and the surface of the net and the pin are pressed. It is characterized in that the head is substantially flush with each other, and then the latex mortar is applied again to the pin and the upper surface of the net so that the net and the pin are covered. Further, the outer wall of Patent Document 1 is an outer wall for a building in which tiles are arranged on the surface of the foundation outer wall, a thin layer of latex mortar is formed on the surface of the tile, and a net is arranged on the upper surface of the latex mortar. Along with the installation, a plurality of locations of the arranged net are pressed against the head by a pin provided with a single flange spreading around the head, the pin is fixed to the foundation outer wall, and the head of the pin and the net are fixed. It is an outer wall for a building characterized in that the surfaces of the above are arranged substantially flush with each other and a layer of latex mortar is formed on the net.

On the other hand, while retaining the appearance of the color tone and color tone of the existing exterior tile wall surface, the effect of preventing the tile pieces from peeling off is effectively applied, the design is restored, the stain prevention function is added, and the waterproof property is strengthened. A method for repairing an existing exterior tile wall surface has been proposed (Patent Document 2). In such a method of repairing the existing exterior tile wall surface, a transparent primer is applied to the existing exterior tile wall surface to form a primer layer, and a main material paint containing a transparent acrylic resin emulsion as a main component is applied to the primer layer a plurality of times. This is a method of repairing an existing exterior tile wall surface in which a main material layer is formed and a transparent topcoat paint is applied to the main material layer to form a topcoat layer. The main material paint contains reinforcing fibers. It is a method for repairing an existing exterior tile wall surface, which is blended and has a viscosity of 20000 to 70000 mPa · s and a thixotropy index of 4.0 to 10.0.

Special Fair 8-14182 JP-A-2007-247279

However, in the construction method of the outer wall for a building and the outer wall thereof shown in Patent Document 1, at least two layers of latex mortar are applied to the tile surface, so that the tile having a design property is covered with the latex mortar. There is a problem that the given design is damaged, and there is a problem that the construction is difficult because the net needs to be arranged on the entire surface so as not to be twisted or loosened.

Further, when the outer wall is an extruded cement plate, the pin may penetrate the side wall portion of the extruded cement plate and reach the hollow portion, so that a sufficient anchor effect cannot be obtained only by driving the pin, and as a result, a sufficient anchor effect cannot be obtained. There is a problem that the effect of preventing tile peeling may be insufficient.

Further, the method of repairing the existing exterior tile wall surface shown in Patent Document 2 has a problem that there are many construction steps because the main material paint containing the transparent acrylic resin emulsion as the main component is applied a plurality of times to form the main material layer. In addition, since a one-component acrylic resin emulsion that needs to be formed at the construction temperature is applied, the glass transition temperature Tg of the acrylic resin is low, and in areas exposed to direct sunlight such as the south surface of the building. When the repair surface is 50 ° C or higher, the tensile strength at that temperature is low, and if there is a part where the coating thickness is thin, the rigidity to sufficiently hold the tile to be peeled off may be insufficient in that part. There is a problem that there is. Even if the temperature of the repaired surface does not rise, it is difficult to increase the initial tensile strength because the main material layer is a layer obtained by drying and forming an acrylic resin emulsion applied multiple times, and as a result. Due to the influence of ultraviolet rays over a long period of time, there is a problem that the rigidity for sufficiently holding the peeled tile may be insufficient.

The problem to be solved by the present invention is to surely prevent the tile from peeling off without impairing the design of the tile attached to the extruded cement plate, the number of construction steps is smaller than before, and the transparent reinforcing layer. By increasing the initial strength of the tile, even if the temperature of the outer wall surface of the building rises or the transparent reinforcing layer is deteriorated by ultraviolet rays, the tiles can be sufficiently prevented from peeling off. The purpose is to provide a tile exfoliation prevention method for molded cement plates.

The invention according to claim 1 is a tile or the tile attached to the side wall surface of a strip-shaped extruded cement plate having a plurality of continuous hollow portions open on both end faces in the longitudinal direction via a tile adhesive layer. A continuous anchor hole penetrating the side wall portion of the extruded cement plate is drilled from the joint between the tile and the tile, and an anchor pin having a cylindrical and axially divided slit portion is inserted into the anchor hole and fixed.
The anchor pin is
A flange portion is provided at one end of the cylindrical portion, a plurality of step portions formed continuously in the circumferential direction are provided at the other end portion of the cylindrical portion, and the cylindrical portion is axially provided from the other end portion toward the flange portion. Multiple split slits that divide in the direction are formed,
A part or all of the step portion is formed at a position where the cylindrical portion protrudes into the hollow portion of the extruded cement plate when the cylindrical portion is inserted into the side wall portion of the extruded cement plate from the other end portion.
The end of the split slit portion on the flange portion side is formed at a position where it stays in the tile adhesive layer or the side wall portion when the cylindrical portion is inserted into the side wall portion of the extruded cement plate from the other end portion.
The tip of the other end of the cylindrical portion is formed at a position where it stays in the hollow portion of the extruded cement plate when the cylindrical portion is inserted into the side wall of the extruded cement plate from the other end.
A bullet-shaped step expansion piece having a diameter smaller than the inner diameter of the cylinder, a diameter larger than the inner diameter of the step, and a tip on the step side is inserted into the cylindrical part between the step and the flange. Anchor pin consisting of
An adhesive that has not yet hardened is injected from one end of the anchor pin, and the anchor pin is fixed to the side wall of the extruded cement plate by curing the adhesive, and the flange of the anchor pin is covered with a cap and fixed. A transparent primer layer is formed by applying a silicon acrylic resin primer containing an amino group-containing acrylic resin and an epoxysilane to the cap, tile surface and joint, and the NCO weight% is 5 to 5 on the transparent primer layer. Apply a transparent polyurea resin coating containing 10% by weight of non-yellowing isocyanate prepolymer, alicyclic polyamine, transparent reinforcing short fibers, hydrophilic fine powder silica, rheology control agent, light stabilizer and ultraviolet absorber. An extruded cement board characterized in that a transparent reinforcing layer is formed, and an acrylic silicon resin coating material containing a light stabilizer and an ultraviolet absorber is applied on the transparent reinforcing layer to form a transparent protective layer. Provide a tile peeling prevention method.

The invention according to claim 2 provides the method for preventing tile peeling of an extruded cement board according to claim 1, wherein the rheology control agent is a polyhydroxycarboxylic acid amide.

According to a third aspect of the invention, the light stabilizer is a hindered amine light stabilizer, according to claim 1 or claim, wherein the UV absorber is a hydroxyphenyl triazine ultraviolet absorbers or benzotriazole ultraviolet absorber Item 2. The method for preventing the extruded cement plate from being peeled off according to item 2 .

In the invention according to claim 4, the alicyclic polyamine is a formula I:

(X in the formula is inert to the isocyanate group, and removes the primary amino group from the organic polyamine having a number average molecular weight of 88 to 400 including m primary amino groups bonded to the alicyclic hydrocarbon. R ₁ and R ₂ are the same or different organic groups having 1 to 18 carbon atoms, and m is an integer of at least 2). The method for preventing tile exfoliation of an extruded cement plate according to any one of claims 1 to 3, which is characterized by being the above polyamine.

In the method for preventing tile peeling of an extruded cement plate of the present invention, an anchor pin that is inserted and fixed in an anchor hole is particularly continuous with a cylindrical portion from the other end to the tile, the tile adhesive layer, and the side wall portion of the extruded cement plate. When inserted into the perforated anchor hole, part or all of the stepped portion protrudes into the hollow portion of the extruded cement plate, and the flange-side end of the split slit portion stays in the tile adhesive layer or the side wall portion. When the cylindrical portion and the step portion are expanded by tapping the step portion expansion piece, the cylindrical portion is in close contact with the anchor hole, and even if the anchor pin is pulled out, the cylindrical portion in the hollow portion is formed. Since it has a larger diameter than the anchor hole, it is hooked on the back surface of the side wall portion of the extruded cement plate, and there is an effect that the anchor pin does not easily come off from the side wall portion. Further, since the flange portion provided at one end of the cylindrical portion of the anchor pin hooks the tile on the upper surface of the tile, the anchor pin of the present invention has the effect of reliably preventing the tile from peeling off. ..

Further, all the perforations of the anchor holes for inserting the anchor pin of the present invention into the side wall portion of the extruded cement plate need to penetrate the side wall portion without being conscious of the depth of the anchor hole. There is an effect that the construction can be carried out easily and quickly.

Further, since the anchor pin has a cylindrical shape as a whole, an adhesive such as an epoxy resin that cures at room temperature and does not harden can be injected from one end of the cylindrical portion, and the injected adhesive is a slit. It leaks to the outside of the anchor pin from the portion and fills the gap between the anchor pin and the anchor hole, and after the adhesive is cured, the anchor pin has the effect of being firmly fixed to the anchor hole (extruded cement plate).

Further, since the end of the slit portion of the anchor pin on the flange portion side is formed at a position where it stays in the tile adhesive layer or the side wall portion, the adhesive injected from one end also flows out into the tile adhesive layer. Therefore, there is an effect that the floating tile can be fixed with the adhesive.

Further, since the step expansion piece that expands the step portion stays in the anchor pin in a state of being in contact with the step portion, the adhesive injected from one end of the cylindrical portion is dammed to the step portion expansion piece. This has the effect of preventing the extruded cement plate from overflowing into the hollow portion from the other end of the cylindrical portion. Therefore, the injected adhesive flows out from the slit portion into the anchor hole outside the anchor pin, the anchor hole is filled with the adhesive, and when the anchor hole is filled with the adhesive, the injected adhesive then flows out into the tile adhesive layer. Therefore, there is an effect that the anchor pin and the extruded cement plate and the tile and the extruded cement plate can be reliably fixed with the adhesive.

Further, the tile has the effect of being directly fixed to the extruded cement board with an anchor pin or fixed to the extruded cement board through a joint. A transparent primer layer is formed by applying an amino group-containing acrylic resin and a silicon acrylic resin primer containing epoxysilane to the cap, tile surface and joint of the anchor pin, and a transparent polyurea resin is applied on the transparent primer layer. Since the material is applied to form the transparent reinforcing layer, the transparent reinforcing layer has the effect of being integrated with the extruded cement plate via the transparent primer layer, the cap of the anchor pin, and the anchor pin. In particular, the polyurea resin coating material forming the transparent reinforcing layer has higher strength than the conventional acrylic resin emulsion, so that it has high rigidity even if the temperature of the wall surface rises and the temperature of the transparent reinforcing layer rises. It has the effect of retaining the resin and reliably preventing the tiles from peeling off.

Further, since the transparent reinforcing layer contains transparent reinforcing short fibers, the transparent reinforcing short fibers have an effect of further reinforcing the coating film formed by the reaction of the non-yellowing isocyanate and the alicyclic polyamine, and the transparent reinforcing layer is particularly effective. When it is on the south side wall surface, the strength of the transparent reinforcing layer does not decrease even if the temperature of the transparent reinforcing layer rises due to sunlight, and it has the effect of surely preventing the outer wall tiles from peeling off. In particular, if the transparent reinforcing short fibers blended in the present invention have a fiber length of about 0.5 to 10 mm, they are subjected to shaking modification by hydrophilic fine silica powder and a rheology control agent, so that the rollers maintain transparency while maintaining transparency. It has good workability with a brush and has the effect of not causing sagging even when applied to an elevation surface.

Further, the polyurea resin coating material forming the transparent reinforcing layer is formed by the reaction of non-yellowing isocyanate having an NCO content of 5 to 10% by weight and an alicyclic polyamine, and the alicyclic polyamine used in the present invention is The reaction is slower than that of aliphatic amines, which are ultra-fast curing, and since non-yellowing isocyanate has a low NCO weight% of 5 to 10% by weight, it has the effect of being able to be applied with iron or the like even at high temperatures in summer. is there. In addition, the cured coating film has the effect of being less likely to turn yellow than aromatic amines, which are generally used to secure pot life and have a slow curing reaction.

Further, a transparent protective layer formed by applying an acrylic silicon resin coating material is provided on the transparent reinforcing layer, and since the transparent reinforcing layer and the transparent protective layer contain a light stabilizer and an ultraviolet absorber, the transparent protection is provided. The layer and the transparent reinforcing layer under the layer are less susceptible to deterioration by ultraviolet rays and the like, have the effect of less decrease in strength over a long period of time, and have the same effect of reliably preventing the tiles from peeling off over a long period of time.

Further, since the transparent primer layer, the transparent reinforcing layer, and the transparent protective layer constructed on the tile are all transparent, it is possible to prevent the tile from peeling off while maintaining the design of the tile having the design. There is an effect.

In addition, since the light stabilizer is a hindered amine-based light stabilizer and the ultraviolet absorber is a hydroxyphenyltriazine-based ultraviolet absorber or a benzotriazole-based ultraviolet absorber, yellowing of the transparent reinforcing layer and the transparent protective layer occurs over a long period of time. It has the effect of preventing a decrease in strength.

It is sectional drawing of the tile peeling prevention structure formed by the tile peeling prevention method of the extruded cement board which concerns on this invention. It is the whole perspective view of one Example of the anchor pin used in this invention. It is a perspective view of the vicinity of the flange part of one Example of the anchor pin used in this invention. It is an overall perspective view of the extruded cement plate in which an anchor pin used in this invention is inserted and fixed. It is a cross-sectional state view of the extruded cement board in which the anchor pin used in the present invention is inserted and fixed, and the tile is attached to the side wall portion via the tile adhesive layer. It is sectional drawing of the extruded cement board which shows the anchor hole which was continuously perforated in the side wall part of the tile, the tile adhesive layer, and the side wall part of the extruded cement board, and the tile is attached to the side wall part through the tile adhesive layer. .. It is sectional drawing of the extruded cement board which shows the state which the anchor pin used in this invention is inserted into the anchor hole, and the tile is attached to the side wall part through the tile adhesive layer. An extruded cement plate with tiles attached to the side wall via a tile adhesive layer, indicating a state in which a driving rod is inserted from one end of an anchor pin inserted into an anchor hole to strike a step expansion piece. It is a cross-sectional state diagram of. When the step expansion piece is hit by the driving rod, the step is expanded and moved, the step closest to the other end of the anchor pin is expanded and stopped, and the step expansion piece is the anchor pin. It is sectional drawing of the extruded cement board which shows the state which stays in the inside and the side wall part, and the tile is attached to the side wall part through the tile adhesive layer.

Hereinafter, the present invention will be described in detail.

First, the anchor pin used in the present invention will be described in detail with reference to FIGS. 2 to 9.

FIG. 2 is an overall perspective view of the anchor pin 10 used in the present invention. A flange portion 2 is provided on the peripheral edge of the cylindrical portion 1 at one end portion 1a of the cylindrical portion 1, and the other end portion of the cylindrical portion 1 is provided. A plurality of stepped portions 3, 4, and 5 formed continuously in the circumferential direction of the cylindrical portion 1 are provided in parallel in 1b. Further, division slit portions 6 and 7 for axially dividing the cylindrical portion 1 are provided from the other end portion 1b toward the flange portion 2.

Here, in this embodiment, three steps of 3, 4, and 5 are provided, but it suffices if a plurality of two or more are provided, and the split slit portions are 6, 7 in this embodiment. Two are provided, but more than two may be provided.

As shown in FIG. 3, the center of the flange portion 2 is open to form an opening 1c, and the epoxy is cured at room temperature from the opening 1c at one end 1a of the cylindrical portion 1 and has not yet hardened. It is designed so that an adhesive such as resin can be injected.

On the other hand, FIG. 4 is an overall perspective view of the extruded cement plate 20 into which the anchor pin 10 used in the present invention is inserted and fixed, and the extruded cement plate 20 is a continuous hollow portion opened on both end surfaces of the longitudinal method. 21 is provided, the hollow portion 21 is partitioned by ribs 22, and the ribs 22 are formed so as to be suspended between the side wall portions 23a and 23b.

In the anchor pin 10 used in the present invention, the tile 40 attached to the side wall portion 23a of one of the extruded cement plates 20 shown in FIG. 4 by, for example, a tile adhesive layer 30 made of cement mortar, was peeled off over time. In order to firmly fix the tile 40 in some cases, the tile 40 is mainly inserted and fixed in the anchor hole 50 continuously drilled in the side wall portion 23a of the tile 40, the tile adhesive layer 30, and the extruded cement plate 20. Yes (see FIGS. 5 to 7), and in particular, in the tile stripping method for an extruded cement plate according to the present invention, the anchor pin 10 is moved from the tile 40 or the joint 41 between the tile 40 and the tile 40 to the extruded cement plate 20. It is used by inserting it into a continuous anchor hole penetrating the side wall portion 23a and fixing it.

As shown in FIG. 7, the anchor pin 10 used in the present invention has a stepped portion 3 when the cylindrical portion 1 is inserted into the anchor hole 50 from the other end portion 1b and inserted into the side wall portion 23a of the extruded cement plate 20. A part or all of the above is formed so as to protrude into the hollow portion 21, and in this embodiment, about half of the step portion 3 protrudes into the hollow portion 21, and both the interstage cylindrical portions 1d and 1e are inside the side wall portion 23a. It is designed to stay in. Of course, all the step portions 3, 4, and 5 may be in a state of protruding into the hollow portion 21.

Further, when the cylindrical portion 1 is inserted into the anchor hole 50 from the other end portion 1b of the anchor pin 10 and inserted into the side wall portion 23a of the extruded cement plate 20, the tip 1f of the other end portion 1b of the cylindrical portion 1 is a hollow portion. It is formed at a position where it stays within 21.

If the tip 1f of the other end 1b of the cylindrical portion 1 is not formed in this way, the anchor hole 50 is perforated when the anchor pin 10 is inserted into the anchor hole 50 until the flange portion 2 abuts on the surface of the tile 40. The tile 40 may not be held by the flange portion 2 by hitting the side wall portion 23b.

Further, in the present embodiment, the ends 6a and 7a of the split slit portions 6 and 7 provided on the cylindrical portion 1 on the flange portion 2 side are inserted into the anchor hole 50 from the other end portion 1b. When inserted into the side wall portion 23a of the extruded cement plate 20, it is formed at a position where it stays in the tile adhesive layer 30 as shown in FIG. As a result, the adhesive injected from the opening 1c can flow out into the tile adhesive layer 30 through the slit portions 6 and 7, and the tile 40 is peeled off or broken by the tile adhesive layer 30. When peeled off, the tile 40 can be fixed by curing the adhesive. Of course, when the end portions 6a and 7a are located on the side wall portions 23a, the adhesive flowing out from the slit portions 6 and 7 can flow out into the tile adhesive layer 30 through the anchor holes 50 and fix the tile 40. ..

Further, between the step portions 3, 4, 5 and the flange portion 2 in the cylindrical portion 1, the diameter is smaller than the inner diameter of the cylindrical portion 1 and larger than the inner diameter of the step portions 3, 4, 5 and the step portion. A bullet-shaped step expansion piece 8 having a tip 8a on the 3, 4, and 5 sides is inserted in a movable state. As shown in FIG. 8, the step portion expansion piece 8 is hit by a driving rod 101 having a cylindrical rod 100 having a diameter smaller than the inner diameter of the cylindrical portion 1 after inserting the anchor pin 10 into the anchor hole 50. Then, the step portions 3, 4 and 5 are expanded from the inside, and in this embodiment, the inter-stage cylindrical portions 1d and 1e strongly press the inner wall of the anchor hole 50 so that the anchor pin 10 is surely placed in the anchor hole 50. It is made so that it can be fixed to. Of course, when all the step portions 3, 4 and 5 protrude into the hollow portion, the cylindrical portion 1 g on the flange 2 side of the step portion 5 strongly presses the inner wall of the anchor hole 50, and the anchor pin 10 becomes the anchor hole 50. It is designed to be securely fixed.

In particular, when the step portion 3 is expanded, the tip 1f of the cylindrical portion 1 has a larger diameter than the anchor hole, the cylindrical portion 1d is in close contact with the anchor hole 50, and the cylindrical portion 1h in the hollow portion 21 is larger than the anchor hole. It has a large diameter. Therefore, even if a pulling force is applied to the anchor pin 10, the anchor pin 10 has a larger diameter than the anchor hole 50 of the cylindrical portion 1h due to the close contact resistance of the cylindrical portion 1d with the anchor hole 50. It never comes off from the side wall portion 23a.

FIG. 9 shows a state in which the step portion expansion piece 8 is hit by the driving rod 101 and moved to a position where the step portion 3 is expanded, and the driving depth of the step portion expansion piece 8 is, for example, the rod of the driving rod 101. A fixed position can be obtained by regulating the driving amount of 100.

Next, a tile peeling prevention method for an extruded cement plate according to the present invention using the anchor pin 10 will be described in detail.

FIG. 1 is a cross-sectional phase diagram of a tile exfoliation prevention structure formed by a tile exfoliation prevention method for an extruded cement plate according to the present invention. Reference numeral 20 denotes an extruded cement plate to which the tile 40 is attached, and the tile 40 is attached to the extruded cement plate 20 via a tile adhesive layer 30 such as a pasting mortar. An anchor hole 50 is formed through a side wall portion 23a in a substantially central portion of the tile surface of the tile 40, and the anchor pin 10 is inserted and fixed in the anchor hole 50. An adhesive such as an epoxy resin that has not yet hardened is injected from the opening 1c, and the anchor pin 10 is fixed to the side wall portion 23a of the extruded cement plate 20 by the curing of the adhesive, and the tile 40 and the extruded cement plate. 20 is fixed.

The flange portion 2 of the anchor pin 10 abuts on the tile surface of the tile 40 and holds the tile 40 firmly so as to press it toward the extruded cement plate 20 side. Further, in the cylindrical portion 1 of the flange portion 2 of the anchor pin 10, the foot portion of the cap 11 having a flat upper portion and a top shape is fitted and fixed, and the flange portion 2 is covered with the flat portion of the cap 11. ..

A transparent primer layer 80 is formed by applying a silicon acrylic resin primer containing an amino group-containing acrylic resin and an epoxysilane to the tile surface and joint 41 of the cap 11 and the tile 40 fixed to the flange portion 2 of the anchor pin 10. A transparent polyurea resin coating material containing a non-yellowing isocyanate prepolymer, an alicyclic polyamine, transparent reinforcing short fibers, a light stabilizer, and an ultraviolet absorber is applied onto the transparent primer layer 80 to make it transparent. A reinforcing layer 90 is formed.

An acrylic silicone resin coating material containing a light stabilizer and an ultraviolet absorber is applied onto the transparent reinforcing layer 90 to form a transparent protective layer 110.

Next, the silicone acrylic resin primer, the polyurea resin coating material, and the acrylic silicone resin coating material used in the tile exfoliation prevention method for the extruded cement board of the present application will be described in detail.

Silicon Acrylic Resin Primer As the amino group-containing acrylic resin of the silicone acrylic resin primer that forms the transparent primer layer used in the present invention, it is possible to use an acrylic resin in which a part of the main chain or side chain is modified with amine. preferable. The acid value of the amine-modified acrylic resin is preferably 1.0 to 10.0 mgKOH / g, and the amine value is preferably 10 to 50 mgKOH / g. If the amine value is less than 10 mg, the adhesion to the polyurea resin coating material that comes to the upper layer becomes insufficient, and if the amine value exceeds 50 mg, the amount of epoxysilane used as a curing agent increases, resulting in high cost. The acid value means the measured value of the number of milligrams of potassium hydroxide which is the molar equivalent of the carboxyl group in 1 g of the polymer (solid content), and the amine value is the measured value in 1 g of the polymer (solid content). It means the measured value of the number of milligrams of potassium hydroxide which is the molar equivalent of the amino group.

The glass transition temperature of the above-mentioned amino group-containing acrylic resin is preferably 10 ° C. or higher and lower than 50 ° C. The glass transition temperature referred to here means a value measured according to JIS K 7121-1987 using a differential scanning calorimeter (DSC). As such a commercially available resin, there is ACRYDIC A-9521 (acid value = 3 mgKOH / g or less, amine value = 20 mgKOH / g, Tg = 15 ° C.) manufactured by DIC Corporation. If the glass transition temperature is less than 10 ° C., the heat resistance becomes insufficient, and if the temperature of the transparent reinforcing layer or the base tile becomes high in summer, the adhesiveness decreases, and if it exceeds 50 ° C., the adhesion to the tile decreases.

Further, the epoxy silane used in combination with the amino group-containing acrylic resin of the silicone acrylic resin primer that forms the transparent primer layer used in the present invention functions as a resin curing agent. The epoxy equivalent of such an epoxy silane curing agent is preferably in the range of 210 to 740 g / eq in terms of solid content. The epoxy equivalent is a theoretical value of the molecular weight of epoxysilane per functional group (epoxy group). If the epoxy equivalent is less than 210, the curing reaction is accelerated and the workability is lowered, and if it is more than 740, the heat resistance is insufficient and the adhesiveness is lowered when the temperature of the transparent reinforcing layer or the base tile becomes high in summer. Examples of such commercially available epoxy silanes include ACRYDIC A-9585 (epoxy equivalent 560 g / eq), A-9585-BA (a product in which only the solvent of A-9585 is changed), and FZ-521 (epoxy equivalent) of DIC Corporation. 590 g / eq), FZ-523 (epoxy equivalent 680-740 g / eq) and the like.

The mixing ratio of epoxysilane to the amino group-containing acrylic resin is determined as follows. First, the number of amino groups contained in 1 g of the amino group-containing acrylic resin is obtained by dividing the total number (mg) of the amine value (mg) and the acid value (mg) by the molecular weight (mg) of KOH, and then the determination is made. The number of epoxy groups contained in 1 g of epoxy silane is determined by dividing the 1 g by the epoxy equivalent, and the approximate number of copies of each is determined so that the ratio of the number of amino groups to the number of epoxy groups is 1: 1. Then, after experimentally confirming the adhesiveness to the underlying tile or anchor pin and the adhesiveness between the present silicone acrylic resin primer and the transparent reinforcing layer described later, the optimum number of copies of the epoxy silane compounded is determined. In the present invention, 50% to 100% of the obtained compounding weight of epoxysilane is preferable as the compounding number of 100 parts by weight of the amino group-containing acrylic resin.

The coating amount relative to the flange portion fixed to a cap and tile surfaces and joints of the anchor pin of the silicon acrylic resin primer is preferably ^{0.06kg / m 2 ~0.12kg / m 2} , 0.06kg / m 2 or less than 0. If it exceeds 12 kg / m ² , the adhesiveness may be insufficient.

Polyurea resin coating material The polyurea resin coating material used in the present invention for forming the transparent reinforcing layer is a non-yellowing isocyanate prepolymer having an NCO weight of 5 to 10% by weight, an alicyclic polyamine, reinforcing fibers, and a light stabilizer. The non-yellowing isocyanate prepolymer containing 5 to 10% by weight of NCO contains an aliphatic bifunctional isocyanate such as hexamethylene diisocyanate (HDI) and an alicyclic type such as isophorone diisocyanate (IPDA). Bifunctional isocyanate, 4,4'-diphenylmethane diisocyanate (MDI), 4,4'-methylenebis (cyclohexyl isocyanate) (hydrogenated MDI) and the like prepolymerized with polyhydric alcohol can be used.

The alicyclic polyamine is a polyamine in which at least one amino group such as isophorone diamine is directly bonded to a cyclohexane ring or the like, and an amine having only a secondary amino group containing no primary amino group is used. .. The weight average molecular weight (theoretical value) is preferably 300 to 1000. If it is less than 300, the pot life becomes short and the workability becomes poor, and if it exceeds 1000, the reaction rate decreases, and the time until touch drying and the rise of the coating film strength are delayed. For the first time, by using an alicyclic polyamine having only a secondary amino group, it is possible to secure a sufficient pot life during which the polyurea resin coating material can be applied with an iron or the like, and further, no yellowing. When used in combination with a modified isocyanate prepolymer, the cured coating does not turn yellow due to ultraviolet rays.

The alicyclic polyamine is represented by the above formula I, and X, R ₁ , R ₂ , and m are one or more kinds of polyamines as described above. This alicyclic polyamine is a polyaspartate or polyaspartate, and m is preferably 2. A divalent hydrocarbon group having 6 to 30 carbon atoms, such as 4,4'-diaminodicyclohexylmethane (4,4'methylenebis (cyclohexylamine)), 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane. (4,4'methylenebis (2-methylcyclohexylamine)), 1-amino-3,3,5-trimethyl-5-aminomethylcyclohexane, hexahydro- (at least 2,4-diaminotoluene or 2,6-diaminotoluene) Polyaspartate ester representing a group obtained by removing a primary amino group from isomeric C-monomethyldiaminodicyclohexylmethane and 3 (4) -aminomethyl-1-methylcyclohexylamine may be preferably used. it can. In particular, X is 4,4'-diaminodicyclohexylmethane (4,4'methylenebis (cyclohexylamine)) or 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane (4,4' methylenebis (2-methylcyclohexylamine)). )), A compound of formula I representing a divalent hydrocarbon group that can be obtained by removing the primary amino group is more preferable.

As the alicyclic polyamine represented by the formula I, R ₁ and R ₂ are preferably methyl, ethyl, n-butyl or 2-ethylhexyl, and the _primary polyamine represented by the formula X- (-NH ₂ ) m is represented by the formula R. ₁ It is produced by reacting with a maleic acid ester or a fumaric acid ester represented by OOC-CH = CH-COOR ₂ .

The alicyclic polyamine having only a secondary amino group, which is obtained by reacting 1 mol of 4,4'-methylenebiscyclohexylamine with 2 mol of diethyl maleate, is 4,4'-methylenebiscyclohexylamine / maleic acid. It is supplied to the market as a diethyl adduct, and its weight average molecular weight (Mw) is 548 (theoretical value) and its viscosity is 2000 mPa · s / 23 ° C. Further, as an alicyclic polyamine having only a secondary amino group, which is obtained by reacting 1 mol of 4,4'methylenebis (2-methylcyclohexylamine) with 2 mol of diethyl maleate, 4,4'-. It is supplied to the market as a methylenebis (2-methylcyclohexylamine) -diethyl maleate adduct, and its weight average molecular weight (Mw) is 578 (theoretical value), and its viscosity is 2000 mPa · s / 23 ° C.

As described above, the non-yellowing isocyanate prepolymer having an NCO% by weight of 5 to 10% by weight includes an aliphatic bifunctional isocyanate such as hexamethylene diisocyanate (HDI) and an alicyclic bifunctional isocyanate such as isophorone diisocyanate (IPDA). Isocyanate, 4,4'-diphenylmethane diisocyanate (MDI), 4,4'-methylenebis (cyclohexyl isocyanate) (hydrogenated MDI) and the like prepolymerized with a polyhydric alcohol can be used. In particular, a non-yellowing isocyanate prepolymer obtained by reacting a polycaplackton-modified polyol with 1,6-hexamethylene diisocyanate is suitable, and as the prepolymer, Duranate E402-100 (trade name, manufactured by Asahi Kasei Chemicals Co., Ltd.) is suitable. , NCO weight%: 8.5%, number average molecular weight 1580, viscosity 6000 mPa · s / 25 ° C., number average number of functional groups 3.2, solid content 100%). If the NCO% by weight is less than 5% by weight, the coating film strength becomes insufficient, and if it exceeds 10% by weight, the pot life when the material is used in the summer is shortened.

The equivalent ratio (NCO group / active hydrogen group) of the NCO group of the non-yellowing isocyanate prepolymer to the active hydrogen group of the alicyclic amine is preferably 0.8 to 1.2. If it is less than 0.8, the viscosity increase after mixing the main agent and the curing agent becomes faster and the pot life becomes shorter. If it exceeds 1.2, the time to dry to the touch and the rise of the coating film strength are delayed.

The non-yellowing isocyanate prepolymer and the alicyclic polyamine are sufficiently mixed and used immediately before the polyurea resin coating material is applied onto the already formed transparent primer layer.

As the transparent reinforcing short fibers contained in the polyurea resin coating material according to the present invention, nylon fibers having an average fiber length of 0.5 to 10 mm and an average fiber diameter of 10 to 50 μm can be used, and a non-yellowing isocyanate prepolymer can be used. By blending 0.5 parts by weight or more and 5 parts by weight or less with respect to a total of 100 parts by weight of the alicyclic polyamine, the strength of the transparent reinforcing layer can be improved while maintaining the transparency of the transparent reinforcing layer. it can. If it is less than 0.5 parts by weight, the strength of the transparent reinforcing layer is not sufficiently improved, and if it exceeds 5 parts by weight, the transparency of the transparent reinforcing layer may be lowered. As a commercially available transparent reinforcing short fiber, there is an alamin tough binder (trade name, average fiber length 3 mm, average fiber diameter 28 μm, manufactured by Toray Amtec Co., Ltd.).

The transparent reinforcing layer is reinforced by transparent reinforcing short fibers, and the transparent reinforcing layer is shake-modified by the hydrophilic fine silica powder and the rheology control agent that are blended at the same time. The combination of these gives the transparent reinforcing layer while maintaining transparency. It is possible to maintain good sagging prevention and coating workability with a roller brush.

The hydrophilic fine powder silica is a non-crystalline fine powder hydrophilic fumed silica, and a silica having a specific surface area of 150 to 500 m ² / g by the BET method can be used. If the specific surface area is less than 150 m ² / g, sufficient rocking denaturation is not imparted, and if it exceeds 500 m ² / g, the workability when applying the transparent reinforcing layer with a roller brush is lowered. Further, it is desirable that the silanol group density of the hydrophilic fine silica is 2SiOH / nm ² or more. Examples of the hydrophilic fine silica that satisfies these requirements include HDK-N20 (trade name, manufactured by Asahi Kasei Wacker Silicone Co., Ltd., specific surface area (BET method) 170 to 230 g / m ² , silanol group density: 2SiOH / nm ² ).

The rheology control agent is a thixotropic property promoter having a free OH group that forms a hydrogen bond with a silanol group on the particle surface of hydrophilic fine powder silica and forms a three-dimensional structure with the silicified particles by the hydrogen bond. In particular, polyhydroxycarboxylic acid amide can be preferably used. As a commercially available rheology control agent, there is BYK-405 (trade name, manufactured by Big Chemie Co., Ltd., polyhydroxycarboxylic acid amide content 51%).

Since the polyurea resin coating material according to the present invention further contains a light stabilizer and an ultraviolet absorber, the strength of the transparent reinforcing layer does not decrease even when exposed to ultraviolet rays for a long period of time. A hindered amine-based light stabilizer can be used as the light stabilizer, and a hydroxyphenyltriazine-based ultraviolet absorber or a benzotriazole-based ultraviolet absorber can be used as the ultraviolet absorber. As commercially available hindered amine-based light stabilizers, TINUVIN292 (trade name, chemical name; bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate), manufactured by Ciba Japan Co., Ltd.) is commercially available. As a hydroxyphenyltriazine-based ultraviolet absorber, TINUVIN400 (trade name, chemical name; 2- (4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine-2-yl) -5- TINUVIN928 (trade name, chemical name; 2- (2H-benzotriazole-2-yl)) is a commercially available benzotriazole-based ultraviolet absorber, which is a reaction product of hydroxyphenyl and oxylane, manufactured by Ciba Japan Co., Ltd. There are -6- (1-methyl-1-phenylethyl) -4- (1,1,3,3-tetramethylbutyl) phenol, manufactured by Ciba Japan Co., Ltd.

One application of the polyurea resin coating material is ^preferably from ^{0.25kg / m 2 ~0.5kg / m 2} , in 0.5 kg / ^{m 2} exceeds some cases sagging occurs when applied to a vertical surface. The polyurea resin coating material is preferably to 0.5kg ^{/ m 2} ~1.4kg ^/ m 2 is applied as a total amount is less than 0.5 kg / ^{m 2} may be insufficient preventive effect tiles flaking, 1. If it exceeds 4 kg / m ² , the cost will be high.

Acrylic Silicone Resin Coating Material The acrylic silicone resin coating material used when forming the transparent protective layer according to the present invention uses an acrylic silicone oligomer having an alkoxysilyl group as a main component and a tin-based curing catalyst as a curing agent. Immediately before applying the acrylic silicone resin coating material on the already formed transparent reinforcing layer, the main agent and the curing agent are uniformly mixed and applied by a roller brush or the like. The alkoxysilyl group of the main agent is crosslinked by the tin-based curing catalyst of the curing agent to form a stable siloxane bond, and exhibits excellent durability.

The content of the alkoxysilyl group is preferably 2% by weight to 30% by weight. If it is less than 2% by weight, the weather resistance is lowered, and if it is more than 30% by weight, the workability is lowered due to the increase in viscosity. As a commercially available acrylic silicon oligomer having an alkoxysilyl group, Kanecasemrack YC4383 (trade name, siloxane crosslinked reactive polymer, viscosity 4000 mP · s / 23 ° C., alkoxyryl group content; 15% by weight, manufactured by Kaneka Co., Ltd. ). As a commercially available tin-based curing catalyst, there is BT405Z (trade name, chemical name; organic tin compound, active tin component; 1.3%, manufactured by Kaneka Co., Ltd.).

The acrylic silicone resin coating material of the present invention contains a light stabilizer and an ultraviolet absorber, and the strength of the transparent reinforcing layer does not decrease even when exposed to ultraviolet rays for a long period of time. A hindered amine-based light stabilizer can be used as the light stabilizer, and as a commercially available hindered amine-based light stabilizer, TINUVIN292 (trade name, chemical name; bis (1,2,2,6,6-pentamethyl-4) -Piperidil) sebacate), manufactured by Ciba Japan Co., Ltd.), hydroxyphenyltriazine-based UV absorbers or benzotriazole-based UV absorbers can be used as UV absorbers, and commercially available hydroxyphenyltriazine-based UV absorbers can be used. As the agent, TINUVIN400 (trade name, chemical name; 2- (4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine-2-yl) -5-hydroxyphenyl and oxylan The reaction product, manufactured by Ciba Japan Co., Ltd., is a commercially available benzotriazole-based ultraviolet absorber as TINUVIN928 (trade name, chemical name; 2- (2H-benzotriazole-2-yl) -6- (1-). There are methyl-1-phenylethyl) -4- (1,1,3,3-tetramethylbutyl) phenol, manufactured by Ciba Japan Co., Ltd.

One application of the acrylic silicone resin coating material is ^preferably from ^{0.06kg / m 2 ~0.12kg / m 2} , coating adhesion is less than 0.06 kg / ^{m 2} and 0.12 kg / ^{m 2} than is There may be a shortage. Preferably 0.12kg ^{/ m 2} ~0.24kg ^/ m 2 as the total amount is less than 0.12 kg / ^{m 2} may be insufficient durability, it increases the cost in 0.24 kg / ^{m 2} greater.

Hereinafter, a specific description will be given with reference to Examples and Comparative Examples.

Examples ACRYDIC A-9521 was used as the amino group-containing acrylic resin of the silicone acrylic resin primer forming the transparent primer layer, and ACRYDIC A-9585 was used as the epoxy silane to prepare the main agent and the curing agent in the formulation shown in Table 1. The weight mixing ratio of the main agent and the curing agent was 13: 1, and the main agent and the curing agent were uniformly mixed to obtain a silicone acrylic resin primer.

As a polyurea resin coating material for forming a transparent reinforcing layer, duranate E402-100 is used as a main agent in a non-yellowing isocyanate prepolymer, and as an alicyclic polyamine A, the above 4,4'-methylenebiscyclohexylamine / diethyl maleate is used. Additives (weight average molecular weight (Mw): 548 (theoretical value), viscosity 2000 mP · s / 23 ° C.) were used as the alicyclic polyamine B as described above for 4,4'-methylenebis (2-methylcyclohexylamine) and diethyl maleate. Additives (weight average molecular weight (Mw): 578 (theoretical value), viscosity; 2000 mP · s / 23 ° C.), alamin tough binder (trade name, average fiber length 3 mm, average fiber diameter 28 μm, Toray) on transparent reinforced short fibers・ Amtec Co., Ltd.), HDK-N20 (trade name, manufactured by Asahi Kasei Wacker Silicone Co., Ltd., specific surface area (BET method) 170 to 230 g / m ² , silanol group density: 2SiOH / nm ² ) on hydrophilic fine powder silica. , BYK-405 (trade name, manufactured by Big Chemie Co., Ltd., polyhydroxycarboxylic acid amide content 51%) is used as a rheology control agent, TINUBIN292 is used as a light stabilizer, TINUVIN400 is used as an ultraviolet absorber, and other defoaming agents are used. An acrylic defoaming agent was blended as an agent, and aminosilane was blended as a wetting agent in a predetermined weight portion shown in Table 1 in order to improve the wettability with transparent reinforcing short fibers to prepare a curing agent. The blending of the aminosilane also has the effect of further maintaining the strength of the coating film even when the temperature of the transparent reinforcing layer becomes high due to sunlight. The weight mixing ratio of the main agent and the curing agent was 4: 3, and the polyurea resin coating material of the example was obtained with these main agent and the curing agent.

As an acrylic silicone resin coating material for forming a transparent protective layer, Kanekazemlac YC4383 is used as an acrylic silicone oligomer having an alkoxysilyl group, TINUBIN292 is used as a light stabilizer, TINUVIN928 is used as an ultraviolet absorber, and other diluents are used. A petroleum-based diluent Tarpen thinner # 50 was used as a main agent by blending a predetermined weight portion of a silicon-based defoamer as shown in Table 1 as a defoaming agent. Further, the curing catalyst BT405Z was used as a curing agent. The weight mixing ratio of the main agent and the curing agent was 19: 1, and the acrylic silicone resin coating material of the example was obtained with these main agent and the curing agent.

Comparative Example 1 to Comparative Example 6
As shown in Table 1, the silicon acrylic resin primer forming the transparent primer layer and the acrylic silicon resin coating material forming the transparent protective layer are the same as those in the examples, and the polyurea resin coating material forming the transparent reinforcing layer is shown in the table. As shown in 1, the same non-yellowing isocyanate prepolymer, alicyclic polyamine A, alicyclic polyamine B, wetting agent, hydrophilic fine powder silica and rheology control agent were used, and the transparent reinforcing short was used. In addition to fibers, polyethylene fiber Chemibest FD380 (trade name, manufactured by Mitsui Chemicals, Inc., average fiber length: 0.7 mm, average fiber diameter: 20-50 μm) is used as the reinforcing short fiber A, and glass short fiber milled fiber is used as the reinforcing short fiber B. EFDE-50-31 (trade name, manufactured by Central Glass Co., Ltd., average fiber length: 50 μm, average fiber diameter: 6 μm, surface silane coupling agent treatment), Leoloseal PM-20L as hydrophobic fine powder silica (trade name, Co., Ltd.) A vapor phase method acrylic manufactured by Tokuyama Co., Ltd.) was blended in a predetermined amount shown in Table 1 to prepare a curing agent of Comparative Examples 1 to 6.

Comparative Example 7
The silicone acrylic resin primer of the above example is used as the coating material for forming the transparent primer layer, and the transparent acrylic emulsion (butyl acrylate / methyl methacrylate copolymer) having a resin solid content of 50% is used as the coating material for forming the transparent reinforcing layer. , Viscosity 50 Pa · s / 20 ° C., TI value (JIS A 6024 thixotropic index: 5.7), nylon short fiber (fiber length 5 mm) containing 2% by weight) was used.

Evaluation method

Under the conditions of tensile strength of 23 ° C. and RH of 50%, the coating materials of Examples and Comparative Examples 1 to 6 and 7 for forming a transparent reinforcing layer are spread in a sheet shape with a thickness of 2 mm and cured for 7 days before JIS. K 6251 Tensile test method for vulcanized rubber It was molded into the specified No. 2 dumbbell piece shape. Then, it was pulled at a tensile speed of 500 mm / min according to the same test method, and the strength at break was defined as the tensile strength (MPa). The test was conducted at 23 ° C and 60 ° C.

The surface of a 70 mm × 70 mm × 20 mm mortar test plate (JIS R 5201: 2015 11.5 compliant) was sanded under a mortar adhesion strength of 23 ° C. and RH of 50%, and the treated surfaces were subjected to Examples and Comparative Examples. About 1 to Comparative example 6, in a silicon acrylic resin primer 0.08 kg / ^{m 2} coating subjected after drying polyurea resin coating material 0.7 kg / ^{m 2} and coating twice (first time 0.4 kg / ^{m 2} after coating was cured and dried, the second 0.3 kg / ^{m 2} was applied), the more the acrylic silicone resin coating material after curing dried two coats with 0.08 kg / ^{m 2,} the after curing for 7 days, JIS a 6909 7.9 Adhesion strength was measured according to the adhesion strength test. For Comparative Example 7, after coating subjected drying a silicon acrylic resin primer 0.08 kg / ^{m 2,} spread the transparent acrylic emulsion at 0.5 kg / ^{m 2,} dried, 0.8 kg / m of the same material spread with a ^2, further dried, dried spread the same material with 0.8 kg / ^{m 2,} subjected then twice the acrylic silicone resin coating material with 0.1 kg / ^{m 2} (layers) coating 7 After curing for a day, the adhesion strength was measured according to the JIS A 6909 7.9 adhesion strength test. Since the mortar plate was broken in all the test specimens, the adhesion strength was defined as the mortar adhesion strength (MPa). The test was conducted at 23 ° C.

Under the conditions of ultraviolet resistance of 23 ° C. and RH of 50%, in Examples and Comparative Examples 1 to 6, a polyurea resin coating material was spread in a sheet shape with a thickness of 2 mm, and after drying, an acrylic silicone resin coating material was further applied. Apply twice at 0.08 kg / m ² and cure for 7 days. In the case of Comparative Example 7, a transparent acrylic emulsion having a thickness of 2 mm and 0.5 kg / m ² was spread and dried, and after drying, the same material was spread at 0.8 kg / m ² and further dried and then the same. The material is spread at 0.8 kg / m ² and dried, then the acrylic silicon resin coating is applied twice (layers) at 0.1 kg / m ² and cured for 7 days. These sheet-shaped cured products are continuously used for 180 hours in a super UV tester (model: SUV-W151, manufactured by Iwasaki Electric, irradiation conditions: water-cooled metal halide lamp used, temperature 63 ° C, humidity 50%, illuminance 100 mW / cm ² ). After irradiation, the JIS K 6251 vulcanized rubber was molded into the shape of a dumbbell No. 2 piece specified in the tensile test method. Then, at the same time as visually confirming the appearance, the material was pulled at a tensile speed of 500 mm / min according to the same test method, and the strength at break was defined as the tensile strength (MPa). The test was conducted at 23 ° C.

Bending strength A mortar plate (100 mm × 200 mm × 30 mm) conforming to JIS R 5201: 2015 11.5 is loaded on the central portion in the longitudinal direction and divided into two. The surface to which the fractured surfaces are brought together and fixed is sanded, and the treated surface is coated with a silicone acrylic resin primer 0.08 kg / m ² for Examples and Comparative Examples 1 to 6 and dried. polyurea resin coating material 0.7 kg / ^{m 2} and coating twice (after coating was cured and dried at the first 0.4 kg / ^{m 2,} 2 time 0.3 kg / ^{m 2} was applied), further acrylic silicone cured dried The resin coating material was applied twice at 0.08 kg / m ² and cured for 7 days, and then a bending test was performed at a loading speed of 1.67 mm / min using a 4-point bending method to determine the bending strength (N). It was measured. The upper load span was 50 mm, and the lower load span was 150 mm. In Comparative Example 7, after coating subjected drying a silicon acrylic resin primer 0.08 kg / ^{m 2,} spread the transparent acrylic emulsion at 0.5 kg / ^{m 2,} dried, and the same material 0.8 kg / Spread at m ² and dry, then spread the same material at 0.8 kg / m ² and dry, then apply acrylic silicon resin coating twice (layer) at 0.1 kg / m ^2. After curing for 7 days, the same test was performed to measure the bending strength (N).

Maximum push-out load
JIS A 5372 (precast reinforced concrete product) One type of upper lid type U-shaped gutter (lid) specified in Annex 5 Nominal name 300 (400 x 600 x 60 mm) (hereinafter referred to as "U-shaped lid") concrete central part The back surface was cut with a concrete core cutter at a shape of φ100 mm and a depth of 55 mm ± 3 mm. The surface is sanded, and for Examples and Comparative Examples 1 to 6, the silicone acrylic resin primer described in the above Examples is applied with a roller brush at 0.08 kg / m ^{2 and} dried. Let me. Next, the polyurea resin coating material described in the above example is uniformly applied with a gold iron at 0.7 kg / m ² and cured and dried, and then the polyurea resin coating material described in the above example is 0.7 kg with a gold iron. / M ² Apply evenly and cure. Next subjected 0.08 kg / ^{m 2} coating an acrylic silicone resin coating material of the above Examples according to ² with coating 0.08 kg / ^m and the acrylic silicone resin coating material further above embodiment described later dry to the touch. After curing for 7 days under the conditions of 23 ° C. and 50% RH, a test piece for measuring the maximum punching load was obtained. After that, the test was carried out according to the JHS 424-2004 peeling prevention punching test method, and the maximum load was set as the punching maximum load (KN).
For Comparative Example 7, after coating subjected drying a silicon acrylic resin primers at roller brush at 0.08 kg / ^{m 2,} spread the transparent acrylic emulsion at 0.5 kg / ^{m 2,} dried, and the same material 0 spread with .8kg / ^{m 2,} further dried, dried spread the same material with 0.8 kg / ^{m 2,} then twice an acrylic silicone resin coating material with 0.1 kg / ^{m 2} (layers) After applying and curing at 23 ° C. and RH 50% for 7 days, the same test was performed.

For pot life Examples and Comparative Examples 1 to polyurea resin coating material of Comparative Example 6, base and curing agent were each prepared in 23 ° C., immediately after mixing the base and curing agent with a B-type rotary viscometer, No. 7 rotor 20rpm The viscosity was measured to obtain the initial viscosity, and then the viscosity was measured every 5 minutes, and the time required to reach twice the initial viscosity was calculated as the pot life.

Anchor pin sticking Commercially available porcelain tile Excel Sand II OM-255 / D (H03) Class I (trade name, 95 x 45 mm, thickness 7 mm, class I (porcelain), manufactured by LIXIL Corporation) Adhesive mortar (thickness 10 mm: tile adhesive layer) is uniformly applied to the entire back surface of one unit of tile plate having a shape of 30 × 30 cm as a whole to which the backing paper is arranged and the backing paper is attached to cure the adhesive mortar. One unit of the tile plate to which the adhesive mortar is attached is vertically and horizontally arranged on the side wall surface of the extruded cement board (60 mm thickness, length 595 mm, width 3540 mm, made of Aica Tech Kenzai, side wall thickness 15 mm) with a joint width of 5 mm. The newly formed joints are filled with adhesive mortar, cured and integrated. After that, continuous anchor holes having a diameter of 5 mm penetrating the hollow portion of the extruded cement plate from the porcelain tile surface were drilled at intervals of 500 mm, and the anchor pins 10 (diameter 4.5 mm, JUU-PA45: trade name, trade name, (Aika Kogyo Co., Ltd.) is inserted and fixed, and then injection epoxy resin adhesive JB-18 (trade name, two-component curable epoxy resin adhesive, manufactured by Aika Kogyo Co., Ltd.) is injected and cured through the opening 1c. , A cap (acrylic silicon resin coating, JUU-PACAP: trade name, manufactured by Aika Kogyo Co., Ltd.) is fitted and fixed to the opening 1c. After that, the silicone acrylic resin primer described in the examples is applied to the tile surface, the cap, and the joint with a roller brush at 0.1 kg / m ^{2 and} dried. Next, the polyurea resin coating material described in the above example is uniformly applied with a gold iron at 0.4 kg / m ² and cured and dried, and then the polyurea resin coating material described in the above example is 0.3 kg with a gold iron. / M ² Apply evenly and cure. Next subjected 0.08 kg / ^{m 2} coating an acrylic silicone resin coating material of the above Examples according to ² with coating 0.08 kg / ^m and the acrylic silicone resin coating material further above embodiment described later dry to the touch. It was cured for 7 days under the conditions of 23 ° C. and RH 50% to prepare a test piece for measuring anchor pin stickiness, and a dynamic wind pressure loading test was performed on the test piece. In the kinetic wind pressure test, the surface on which the tile exfoliation prevention method was applied was continuously decompressed by -200 Pa for 90 seconds, decompressed to a maximum of -4000 Pa, and the condition of the anchor pins and the coating film was visually observed. did. As a result, there was no abnormality such as disconnection of the anchor pin, and no peeling of the coating film occurred.

Adhesion of Tile / Transparent Reinforcing Layer Regarding Examples and Comparative Examples 1 to 6, commercially available porcelain tiles Aurora Pale 50 / 2T PL-100 (trade name, 95 x 45 mm, thickness 7 mm, class I (porcelain), denoted coating the silicon acrylic resin primer 0.08 kg / ^{m 2} Ltd. Danto Co.), the dried polyurea resin coating material 0.7 kg / ^{m 2} and coating once, after drying 23 ° C. 7 days, porcelain tiles A skin gap was inserted between the and the polyurea resin coating material to forcibly separate and peel off the polyurea resin coating material. By visually observing the peeled polyurea resin coating material and the surface of the porcelain tile, the adhesion between the tile and the silicon acrylic resin primer (primer layer) and the silicon acrylic resin primer (primer layer) and the polyurea resin coating material (transparent reinforcing layer) ) Was determined. Those with good adhesion were judged as ◯, and those with other properties were judged as x.

Sagging blind of commercial porcelain tile Aurora Pale 50-2T PL-100 (trade name, 95 × 45mm, thickness: 7mm, I class (porcelain), manufactured by Danto Co., Ltd.) in advance JISA5371 of 300mm × 300mm × thickness of 60mm A commercially available epoxy resin adhesive is attached to the surface of the dried concrete flat plate to hold the concrete flat plate vertically. A polyurea resin coating material was applied to the surface of the porcelain tile at 0.5 kg / m ² with the transparent reinforcing layers of Examples and Comparative Examples 1 to 6, and the state of the coating material at which sagging stopped was visually evaluated. The evaluation was evaluated as ◯ for those without sagging, Δ for those with slight sagging, and x for those with overall sagging.

Subjected apply a transparent reinforcing layer of Examples and Comparative Examples 1 to 6 at 0.5 kg / ^{m 2} on a transparent glass plate (150 × 150 × 2mm), the visual transparency of the coating film after curing Evaluated. In the evaluation, those having high transparency of the coating film were evaluated as ◯, those having some white turbidity in the coating film were evaluated as Δ, and those having an opaque coating film were evaluated as x.

Coating workability Commercially available porcelain tile Aurora Pale 50-2T PL-100 (trade name, 95 x 45 mm, thickness: 7 mm, class I (porcelain), manufactured by Danto) is preliminarily applied to JIS A5371 300 mm x 300 mm x thickness 60 mm. Adhere to the surface of the dried concrete flat plate with a commercially available epoxy resin adhesive. The silicone acrylic resin primers of Examples and Comparative Examples 1 to 6 are applied to the surface of the porcelain tile at 0.08 kg / m ² , and after drying, the transparent reinforcing layers of Examples and Comparative Examples 1 to 6 are applied. Was applied at 0.5 kg / m ² with a roller brush and a gold iron, and the application workability at that time was evaluated. For evaluation, those that could be easily applied using a gold iron and a roller brush are ○, those that can be applied with a gold iron but cannot be applied with a roller brush are △, and those that can be applied with a gold iron and a roller brush are applied. Those that cannot be done are marked with x.
Evaluation Results The evaluation results are shown in Table 2.

1 Cylindrical part 1a One end 1b End end 1c Opening 1d, 1e Inter-stage cylindrical part 1f Tip 1g, 1h Cylindrical part 2 Flange part 3, 4, 5 Step part 6, 7 Divided slit part 6a, 7a End Part 8 Step expansion piece 8a Tip part 10 Anchor pin 20 Extruded cement plate 21 Hollow part 22 Rib 23a, 23b Side wall part 30 Tile adhesive layer 40 Tile 50 Anchor hole 80 Transparent primer layer 90 Transparent reinforcing layer 100 Rod 101 Driving rod 110 Transparent protective layer

Claims (4)

Extruded from a tile attached via a tile adhesive layer to the side wall surface of a strip-shaped extruded cement plate having a plurality of continuous hollow portions open on both end faces in the longitudinal direction or from a joint between the tiles. A continuous anchor hole penetrating the side wall portion of the molded cement plate is drilled, and an anchor pin having a cylindrical shape and an axially split slit portion is inserted into the anchor hole and fixed.
The anchor pin is
A flange portion is provided at one end of the cylindrical portion, a plurality of step portions formed continuously in the circumferential direction are provided at the other end portion of the cylindrical portion, and the cylindrical portion is axially provided from the other end portion toward the flange portion. Multiple split slits that divide in the direction are formed,
A part or all of the step portion is formed at a position where the cylindrical portion protrudes into the hollow portion of the extruded cement plate when the cylindrical portion is inserted into the side wall portion of the extruded cement plate from the other end portion.
The end of the split slit portion on the flange portion side is formed at a position where it stays in the tile adhesive layer or the side wall portion when the cylindrical portion is inserted into the side wall portion of the extruded cement plate from the other end portion.
The tip of the other end of the cylindrical portion is formed at a position where it stays in the hollow portion of the extruded cement plate when the cylindrical portion is inserted into the side wall of the extruded cement plate from the other end.
A bullet-shaped step expansion piece having a diameter smaller than the inner diameter of the cylinder, a diameter larger than the inner diameter of the step, and a tip on the step side is inserted into the cylindrical part between the step and the flange. Anchor pin consisting of
An adhesive that has not yet hardened is injected from one end of the anchor pin, and the anchor pin is fixed to the side wall of the extrusion-molded cement plate by curing the adhesive, and the flange of the anchor pin is covered with a cap and fixed. A transparent primer layer is formed by applying a silicon acrylic resin primer containing an amino group-containing acrylic resin and an epoxysilane to the cap, tile surface and joint, and the NCO weight% is 5 to 5 on the transparent primer layer. Apply a transparent polyurea resin coating containing 10% by weight of non-yellowing isocyanate prepolymer, alicyclic polyamine, transparent reinforcing short fibers, hydrophilic fine powder silica, rheology control agent, light stabilizer and ultraviolet absorber. An extrusion-molded cement board characterized in that a transparent reinforcing layer is formed, and an acrylic silicon resin coating material containing a light stabilizer and an ultraviolet absorber is applied on the transparent reinforcing layer to form a transparent protective layer. Tile peeling prevention method. The method for preventing tile peeling of an extruded cement board according to claim 1, wherein the rheology control agent is a polyhydroxycarboxylic acid amide. The extruded cement plate according to claim 1 or 2 , wherein the light stabilizer is a hindered amine-based light stabilizer, and the ultraviolet absorber is a hydroxyphenyltriazine-based ultraviolet absorber or a benzotriazole-based ultraviolet absorber. Tile peeling prevention method. The alicyclic polyamine is Formula I:

(X in the formula is inert to the isocyanate group, and removes the primary amino group from the organic polyamine having a number average molecular weight of 88 to 400 including m primary amino groups bonded to the alicyclic hydrocarbon. R1 and R2 are the same or different organic groups having 1 to 18 carbon atoms, and m is at least an integer of 2). The method for preventing tile exfoliation of an extrusion-molded cement plate according to any one of claims 1 to 3, which is a polyamine.