JP2987090B2 - Mortar base sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mortar base sheet used for applying mortar to an outer wall of a building or the like.

[0002]

2. Description of the Related Art As shown in FIG. 2, for example, conventionally, when an outer wall 1 of a building, such as a house, is finished with mortar, a waterproof property is first placed on a foundation 2 of the building. The asphalt-impregnated paper 3 having a staple 4 is attached to the surface of the asphalt-impregnated paper 3 and a lath 5 is attached to the surface of the staple 4, followed by applying an undercoat mortar 6 and an overcoat mortar 7 in that order to finish the work.

[0003]

However, since the adhesion between the asphalt-impregnated paper 3 and the undercoat mortar 6 is low,
If the top coat mortar 7 is applied immediately after the application of the base coat mortar 6 when finishing by applying the top coat mortar 7, there is a possibility that the base coat mortar 6 may be peeled off by its own weight. Therefore, conventionally, the undercoating mortar 6 must be at least 2
After curing for about 4 hours, the surface was watered, and then a top coat mortar 7 was applied to finish. However, in the above-mentioned construction work, after the application of the undercoat mortar 6, the construction work must be interrupted with the curing, so that a problem that the construction work is prolonged occurs.

Further, the mortars 6 and 7 are provided with extensibility,
In order to improve workability during troweling, the addition of water (excess water) to the mortars 6 and 7 that is higher than the water required for the hydration of cement also contributes to prolonging the curing time. I was On the other hand, in the summer season or the like, the so-called dry-out phenomenon, in which the surfaces of the mortars 6 and 7 are rapidly dried and cracks occur due to irradiation of direct sunlight on the mortars 6 and 7 during curing, may occur.

When the undercoat mortar 6 is applied to the asphalt-impregnated paper 3, the moisture in the undercoat mortar 6 permeates through the needle holes of the staples 4 and wets the base 2,
There was a risk of causing corrosion and the like. Furthermore, there is a problem that the strength of the asphalt-impregnated paper 3 is low and the asphalt-impregnated paper 3 is easily broken during the construction work.

The present invention has been made in view of the above circumstances, and it is possible to carry out construction work extremely easily without causing mortar peeling, dryout phenomenon, base material corrosion, etc. It is intended to provide an excellent mortar base sheet.

[0007]

According to the present invention, when mortar is applied to an outer wall of a building such as a house, the mortar is attached to a foundation.
We are in a mortar base sheet disposed between the mortar to be applied as a base, in particular, the more base side, proof
It is characterized in that water, a waterproof / moisture-permeable sheet having moisture permeability , a water-absorbing / water-holding sheet having water absorption and water retention, and a reinforced sheet for imparting a predetermined strength to the mortar base sheet are laminated.

It is desirable that a coating layer that is hardly soluble in water and soluble in a strong alkaline solution is formed on the surface of the mortar base sheet. Here, for the coating layer, for example, a layer obtained by adding polyvinyl alcohol to a copolymer of polyvinyl acetate and acrylic acid is used. Further, it is also possible to impart water repellency to the surface of the mortar base sheet.

[0009]

Embodiments of the present invention will be described below in more detail with reference to the drawings. FIG. 1 is a sectional view showing the structure of a mortar base sheet 11 according to the present invention. This mortar base sheet 11 is on the back side (right side in the figure).
The water-permeable and moisture-permeable sheet 12, the water-absorbent and water-retentive sheet 13 laminated on the surface of the waterproof and moisture-permeable sheet 12, and the reinforced sheet 14 laminated on the surface of the water-absorbent and water-retainable sheet 13 are roughly constituted. ing.

The waterproof / moisture permeable sheet 12 is formed by coating or laminating an elastic resin layer 12b having waterproof and moisture permeable properties on the back surface of the nonwoven fabric layer 12a. The water-absorbing / water-retaining sheet 13 has excellent water-absorbing and water-retaining properties, and is made of a material selected from paper, nonwoven fabric, or woven fabric, or a laminate thereof.

Further, the reinforced sheet 14 is made of a nonwoven fabric having enhanced tensile strength and tear strength in the direction in which the reinforcing sheet 14 is provided, and has a remarkable (density) adhesiveness to mortar (anchor effect). Moreover, it is appropriately adjusted so as not to impair the function of the suction / water retention sheet 13 on the back side.

At the time of construction, the mortar base sheet 11
Is adhered to the substrate 2 with the staples 4 with the waterproof / moisture permeable sheet 12 as the substrate side, and the lath 5 is adhered to the surface side of the mortar substrate sheet 11 with the staples 4 and then the undercoat mortar 6 is applied. . However, the excess moisture contained in the undercoat mortar 6 is successively absorbed by the water absorbing / water retention sheet 13, so that the hardening curing of the undercoat mortar 6 is promoted.

As a result, according to the mortar base sheet of the present invention, after the undercoat mortar 6 is applied, the overcoat mortar 7 can be applied in a short time of about 30 minutes. Therefore, like the conventionally used asphalt-impregnated paper 3, after the undercoat mortar 6 is applied, the undercoat mortar 6
It is not necessary to suspend the work for a long period of time to cure and cure, and the construction period is shortened.

On the other hand, the water absorbed by the water-absorbing / water-retaining sheet 13 is retained in the water-absorbing / water-retaining sheet 13, and this water is used to prevent excessive drying when the mortars 6, 7 are cured. , 7 is gradually reduced, and as a result, the mortar 6, 7 is cured by the so-called "wet muscillo effect". Then, the mortars 6, 7 exhibit an ideal hydration reaction, and a mortar 6, 7 layer having the highest strength is formed. Further, since the mortar layers 6 and 7 are not excessively dried, the occurrence of a dry-out phenomenon is also prevented.

Further, the waterproofness and moisture permeability of the waterproof / moisture permeable sheet 12 prevent the invasion of moisture from outside to the base 2 and the occurrence of internal dew inside the base 2. In addition, the elastic resin layer 12b coated or film-laminated on the nonwoven fabric layer 12a ensures the sealing property at the needle holes of the staple 4, so that corrosion of the base 2 due to leakage of moisture from the needle holes is reliably prevented. Is done.

Further, since the mortar base sheet 11 is reinforced by the reinforcing sheet 14, unlike the asphalt-impregnated paper 3, the mortar base sheet 11 is not broken during the construction work. Moreover, the anchoring effect between the reinforcing sheet 14 and the undercoat mortar 6 prevents peeling of the mortars 6, 7 during construction. Moreover, the strength of the reinforcing sheet 14 itself and the above-mentioned anchor effect improve the strength of the outer wall 1 after the mortar 6,7 is applied, and as a result, the occurrence of cracks in the outer wall 1, the peeling of the mortar 6,7 and the like are prevented.

On the other hand, a coating layer (not shown) that is hardly soluble in water and soluble in a strong alkaline solution may be formed on the surface of the water absorbing / water retaining sheet 13. As the coating layer, a layer obtained by adding polyvinyl alcohol to a copolymer of polyvinyl acetate and acrylic acid is used.

In the case of the mortar base sheet 11 having a coating layer, the water absorption / water retention of the water absorbing / water retaining sheet 13 is suppressed during the application operation of the undercoat mortar 6 due to the property of the coating layer being hardly soluble in water. As a result, the spreadability of the undercoat mortar 6 is maintained, and the coating operation can be performed more easily.

On the other hand, when a predetermined time has elapsed after the application of the undercoat mortar 6, the pH derived from the cement in the mortar 6
The coating layer is dissolved by about 14 strong alkaline aqueous solutions, and the water in the mortar 6 is absorbed by the water absorbing and retaining sheet 13 and is retained. As a result, the hardening curing of the undercoat mortar 6 is promoted, and the overcoat mortar 7 can be applied.

That is, if the above-mentioned predetermined time is adjusted so that the coating layer is dissolved upon completion of the application of the undercoat mortar 6, the overcoat mortar 7 can be applied after the application of the undercoat mortar 6. Therefore, even in the case of the mortar base sheet 11 having the coating layer, it is necessary to suspend the work for a long time for curing and curing of the undercoat mortar 6 after the application of the undercoat mortar 6 like the asphalt impregnated paper 3 conventionally used. And the construction period is shortened.

In this case, the timing of the coating operation time of the undercoat mortar 6 and the alkali dissolution reaction time of the coating layer are determined by the timing of the copolymer of polyvinyl acetate and acrylic acid and polyvinyl alcohol constituting the coating layer. Adjust according to the mixing ratio. Alternatively, the dissolution time of the coating layer may be changed depending on construction conditions such as construction location, construction season, weather at the time of construction, and the like.

The surface of the water-absorbing / water-retaining sheet 13 and / or the surface of the reinforcing sheet 14 may be slightly coated with a water-repellent agent, or a wax may be added to the coating layer at a rate of, for example, about 2%, so that a mortar base is formed. It is also possible to improve the water repellency of the sheet 11. In this case, even if it gets wet with rain or the like, the water absorption / water retention sheet 13 does not need to contain excess water in advance, so that troubles such as insufficient water absorption during mortar construction are prevented.

[0023]

As described above, according to the present invention, the construction work can be performed extremely easily without causing the mortar peeling, the dry-out phenomenon, the base material corrosion, etc. An excellent mortar base sheet can also be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a mortar base sheet showing a structure of a mortar base sheet according to the present invention.

FIG. 2 is a perspective view of an outer wall of a building for explaining a procedure of applying mortar to the outer wall.

[Explanation of symbols]

Reference Signs List 1 outer wall 2 base 6 base coat mortar (mortar) 7 top coat mortar (mortar) 11 mortar base sheet 12 waterproof / moisture permeable sheet 13 water absorption / water retention sheet 14 reinforcement sheet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-3956 (JP, A) Japanese Utility Model Application Hei 5-24768 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04F 13/04

Claims (4)

(57) [Claims] When a mortar is applied to an outer wall of a building such as a house, the mortar base sheet is attached to a base and disposed between the base and a mortar to be applied. Waterproof and breathable sea with more waterproof and breathable
A mortar base sheet, comprising: a water-absorbing / water-holding sheet having water absorption and water retention; and a reinforcing sheet for imparting a predetermined strength to the mortar base sheet. 2. The mortar base sheet according to claim 1, wherein a coating layer that is hardly soluble in water and is soluble in a strong alkaline solution is formed on the surface. 3. The coating layer according to claim 2, wherein a copolymer of polyvinyl acetate and acrylic acid to which polyvinyl alcohol is added is used.
The described mortar base sheet. 4. The mortar base sheet according to claim 1, wherein the surface is provided with water repellency.