JP2763570B2 - Exterior wet stone bonding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an exterior wet stone sticking method in which a back surface treatment material is applied to an exterior stone material and the exterior stone material is attached to an outer wall of a building.

<Conventional technology> When installing exterior stone materials, water that has penetrated into the stone back from the joints or moisture in the backfill mortar oozes out on the surface of the stone materials, causing a wet color, The free lime in the backfill mortar dissolved in them precipitates on the surface of the stone, causing efflorescence. For example, there is a problem in that the exterior stone is contaminated and the appearance is impaired.

Therefore, conventionally, as a back surface treatment material, a polysulfide-modified epoxy resin having water resistance and adhesiveness to mortar is used for the coating film, and the polysulfide-modified epoxy resin is applied to the back surface of the exterior stone material.

<Problems to be solved by the invention> However, the polysulfide-modified epoxy resin has a high viscosity and has to be thickly applied to the back surface of the exterior stone material, so that the application work is troublesome and the material cost is high. was there.

In addition, when using a polysulfide-modified epoxy resin, an aliphatic polyamine or the like is usually used as a curing agent, and a malodor is generated due to the curing agent, thereby deteriorating the work environment and deteriorating workability. was there.

Furthermore, because of the high viscosity as described above, it is difficult to apply to the end face facing the fore-edge, the fore-edge treatment becomes insufficient,
There is also room for improvement in the prevention of contamination of exterior stones, as it is difficult to prevent water from entering through small openings.

In order to improve the adhesiveness, Japanese Unexamined Patent Publication No.
-225166, there is a primer composition for urethane coating material containing an acrylic emulsion, an epoxy resin and an inorganic substance, but this is a one-part type coating material, and If left for a certain period of time afterwards, the effect on the adhesive strength is lost, and it cannot be used as a back surface treatment for exterior stone materials.

The present invention has been made in view of such circumstances, and has good workability, and is inexpensive, but it is possible to apply an exterior stone material to a building outer wall in a state where there is no contamination due to water or the like oozing out of mortar. The purpose is to be able to hold for a long time.

<Means for solving the problem> The exterior wet stone pasting method according to the present invention, in order to achieve the above-described object, applies an epoxy-based primer from the back surface of the exterior stone material to the end face facing the forehead, and An EVA-based or acrylic-based aqueous emulsion is applied to the surface of the epoxy-based primer, and the exterior stone is held facing the building exterior wall, and a mortar is provided between the back surface of the exterior stone and the exterior surface of the building exterior wall. Is filled.

<Action> According to the exterior wet stone sticking method according to the present invention, the epoxy primer applied from the back surface of the exterior stone to the edge of the fore edge shows complete water resistance after curing, and the water applied on the A small amount of the emulsion penetrates into the epoxy-based primer layer and shows strong adhesion between the epoxy-based primer layer and the aqueous emulsion layer. Furthermore, since the aqueous emulsion is partially emulsified by contact with moisture in the mortar to be filled and hardens together with the mortar layer, it also adheres strongly to the mortar layer. That is, the layer composed of the epoxy-based primer and the aqueous emulsion has a sufficient adhesive force between the stone and the mortar, and prevents the infiltration of water from the stone back by the water-blocking of the epoxy-based primer. it can.

Further, even if a strain stress is generated due to drying shrinkage and a change in temperature of the mortar, the aqueous emulsion layer relaxes the strain stress, so that the water barrier property of the epoxy-based primer layer can be more favorably maintained.

In addition, in the end face portion facing the fore edge, the infiltration of water can be completely prevented by the epoxy primer applied thereto.

<Examples> Next, examples of the exterior wet stone sticking method of the present invention will be described in detail in order with reference to the drawings.

First, as shown in the cross-sectional view of FIG. 1, an epoxy-based primer 2 is applied from the back surface F1 of the exterior stone material 1 to an end surface F2 facing the fore edge.

Next, as shown in the sectional view of FIG.
On the surface of the epoxy primer 2 applied to the backside F1 of the
EVA or acrylic aqueous emulsion 3 is applied.

Thereafter, as shown in the cross-sectional view of FIG. 3 showing the state of attachment to the building outer wall, the exterior stone 1 coated with the epoxy primer 2 and the aqueous emulsion 3 is opposed to the building outer wall 4, and 5 and a trigger material, a stone-pulling anchor 6, etc., and a foam material 8 is packed in a fore-edge 9 to prevent the mortar 7 from leaking out.
The mortar 7 is filled between the back surface of the building and the outer surface of the building outer wall 4.

Finally, as shown in the cross-sectional view of FIG.
And finish the joint.

As the epoxy primer described above, Pluscoat ER
(Chugai Shoko) and EP primer (Chugai Shoko) are used.

In addition, as an aqueous emulsion, acrylic AM-4
01 (manufactured by Japan Defense Chemicals) and EVA-based HF-1000 (manufactured by Nippon Kasei) can be used. To increase the wettability, butyl cellosolve or ethyl cellosolve may be added to this aqueous emulsion.

 Next, the results of comparative experiments will be described.

In Example 1, an EP primer was used as an epoxy-based primer, and an acrylic AM-401 was used as an aqueous emulsion.

In Example 2, plus coat ER was used as an epoxy primer, and EVA was used as an aqueous emulsion.
The system HF-1000 was used.

On the other hand, as a comparative example, an epoxy resin, Hamatite Y-1700TM (manufactured by Yokohama Rubber) was used.

In each of the above three examples, when the exterior stone material 1 was attached to the building outer wall 4 in a state where a predetermined adhesive force was exhibited, the results shown in the following table were obtained in the amount of application and the price ratio.

From the above results, Example 1 and Example 2 of the method of the present invention
In either case, it is clear that the coating amount can be reduced to half or less and the material cost can be reduced by 40% or more compared to the conventional example.

In addition, after applying each of the above Examples 1 and 2 to the back surface of the exterior stone material, it was left for 40 days and then held on the building outer wall, and the outer surface of the building outer wall and the exterior surface of the exterior stone material were compared. When the mortar was filled in between, the mortar was firmly adhered to the backing mortar and it was possible to exhibit good water shielding.It is clear that this is not affected by the coating interval between the epoxy primer and the aqueous emulsion. According to the invention method, since the period between the treatment on the back surface of the exterior stone material and the actual installation at the site does not affect the adhesiveness and the water blocking property, the exterior surface stone is also processed during the processing of the exterior stone material. In addition, in the case of semi-wet construction, etc., it is possible to apply only an epoxy-based primer at the time of stone processing, and to apply an aqueous emulsion partially at the time of construction. Engineering conditions, flexibility to correspond to the scale, such as in the field, has the advantage of being able to reduce the turn construction cost.

<Effect of the Invention> According to the exterior wet stone sticking method of the present invention, by applying a low viscosity epoxy-based primer and an aqueous emulsion, the stone material and the mortar can be well bonded to each other. And
Since the functions are separated by the two-layer structure, only a thin coating is required, the amount of material used is reduced, and the cost is low.

In addition, since a hardening agent such as an aliphatic polyamine is not used, no bad odor is generated, the coating operation can be performed in a favorable environment, and the workability can be improved.

In addition, it is possible to prevent water from flowing from the fore edge to the back surface of the exterior stone material, so that contamination of the exterior stone material can be better prevented.

[Brief description of the drawings]

Drawings show an embodiment of the exterior wet stone sticking method according to the present invention, FIG. 1 is a sectional view showing a state where an epoxy-based primer is applied, and FIG. 2 is a sectional view showing a state where an aqueous emulsion is applied. , FIG. 3 and FIG. 4 are cross-sectional views each showing a state of being attached to the building outer wall. DESCRIPTION OF SYMBOLS 1 ... Stone material for exterior 2 ... Epoxy primer 3 ... Aqueous emulsion 4 ... Outside wall of building 5 ... Dowel pin 6 ... Stone anchor and trigger 7 ... Mortar 8 ... Foam material 9 ... Small edge F1 …… The back side of the exterior stone F2 …… The end face facing the fore edge of the exterior stone

──────────────────────────────────────────────────続 き Continuing on the front page (72) Nobuo Murakami, Inventor 3-1-1, Mokudori, Mihara-cho, Minamikawachi-gun, Osaka Prefecture Osaka Branch of Takenaka Corporation Technical Research Institute Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) E04F 13/08-13/18

Claims (1)

(57) [Claims] 1. An epoxy-based primer is applied from the back surface of an exterior stone to an end face facing a fore edge, an EVA-based or acrylic-based aqueous emulsion is applied to the surface of the epoxy-based primer, and the exterior stone is applied to a building outer wall. An exterior wet stone application method, wherein the mortar is filled between a back surface of the exterior stone material and an outer surface of the exterior wall of the building while holding the stones facing each other.