JPH0972062A - Mortar underlay sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mortar underlay sheet excellent in the strength with which it is possible to easily execute the works without causing mortar exfoliation, dry-out phenomenon when mortar works are in execution, or corrosion of the underlay. SOLUTION: A mortar underlay sheet 11 is formed by laminating a waterproof/moisture permeative sheet 12, a water absorptive/retaining sheet 13, and a strengthening sheet 14, which are laid in the sequence from the underlay side as named, wherein the sheet 14 is to give a specified strength to the resultant sheet 11. It may also be accepted that a coating layer which is unlikely to be dissolved in water and will be dissolved in a strong alkali solution, is formed over the surface of the mortar underlay sheet 11. The material of the coating layer is prepared, for example by adding polyvinyl alcohol to copolymer of polyvinyl acetate and acrylic acid. It is also likely to give water repelency to the surface of the mortar underlay sheet 11.

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 when applying mortar to an outer wall of a building.

[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. After assembling the asphalt-impregnated paper 3 with staples 4 and attaching the lath 5 to the surface with the staples 4, the undercoat mortar 6 and the overcoat mortar 7 are applied in that order to finish the work.

[0003]

By the way, since the adhesiveness between the asphalt-impregnated paper 3 and the undercoat mortar 6 is low,
When the top coat mortar 7 is applied and finished immediately after the bottom coat mortar 6 is applied, there is a fear that the whole bottom coat mortar 6 may be peeled off due to its own weight. Therefore, in the conventional method, the undercoat mortar 6 is at least 2
After curing for about 4 hours, the surface was water-polished and then overcoated mortar 7 was applied to finish. However, in the above-mentioned construction work, after the undercoat mortar 6 has been applied, the construction work has to be interrupted due to curing, which causes a problem that the construction work is prolonged.

Further, the mortars 6 and 7 are provided with spreadability,
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 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]

The present invention relates to a mortar base sheet which is arranged between a base and a mortar to be applied when mortar is applied to the outer wall of a building such as a house. , A waterproof / moisture permeable sheet having water resistance and moisture permeability, a water absorbing / water retaining sheet having water absorbing property,
Further, the mortar base sheet is characterized in that a reinforcing sheet imparting a predetermined strength is laminated.

Further, it is desirable that a coating layer that is difficult to dissolve in water and dissolves in a strong alkaline solution is formed on the surface of the mortar base sheet. Here, for the coating layer, for example, a copolymer of polyvinyl acetate and acrylic acid to which polyvinyl alcohol is added is used. Further, it is also possible to impart water repellency to the surface of the mortar base sheet.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described 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 waterproof / moisture permeable sheet 12, a water absorbing / water retaining sheet 13 laminated on the surface of the waterproof / moisture permeable sheet 12, and a reinforcing sheet 14 laminated on the surface of the water absorbing / water retaining sheet 13 ing.

Here, the waterproof / moisture permeable sheet 12 is formed by coating or laminating the elastic resin layer 12b having waterproofness and moisture permeability on the back surface of the nonwoven fabric layer 12a. The water-absorbing / water-retaining sheet 13 is excellent in water absorption and water retention, and the material thereof is selected from paper, non-woven fabric, woven fabric, or a laminated body thereof.

Further, the reinforcing sheet 14 is made of a non-woven fabric whose tensile strength and tear strength in the disposing direction are strengthened, and its opening (density) has high adhesiveness (anchor effect) to mortar, Moreover, it is properly adjusted so as not to impair the action of the water absorbing / water retaining sheet 13 on the back side.

During construction, the mortar base sheet 11
With the waterproof / moisture permeable sheet 12 side as the base side and pasted on the underside 2 with the staples 4, and further the lath 5 on the surface side of the mortar underlayer sheet 11 with the staples 4 and then the undercoat mortar 6 is applied. . However, since the excess water contained in the undercoat mortar 6 is sequentially absorbed by the water absorbing / water retaining sheet 13, the curing and 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 applying the undercoat mortar 6, the undercoat mortar 6
Since it does not need to be interrupted for a long period of time because it is cured and cured, the construction period can be 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, but this water is prevented from excessive drying when the mortar 6 and 7 is cured. , 7 is gradually reduced, and as a result, the mortars 6 and 7 are 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. Furthermore, since the mortar layers 6 and 7 are not excessively dried, the occurrence of a dryout phenomenon is also prevented.

Further, due to the waterproofness and moisture permeability of the waterproof / moisture permeable sheet 12, it is possible to prevent moisture from entering the underlayer 2 from the outside or to prevent internal dew condensation in the underlayer 2. In addition, since the elastic resin layer 12b coated or film-laminated on the non-woven fabric layer 12a secures the sealing property in the needle hole of the staple 4, it is possible to surely prevent the corrosion of the substrate 2 due to the seepage of water from the needle hole. To be done.

Further, since the mortar base sheet 11 is reinforced by the reinforcing sheet 14, it does not break during the construction work unlike the asphalt-impregnated paper 3. Moreover, the anchor effect between the reinforcing sheet 14 and the undercoat mortar 6 prevents the mortars 6 and 7 from peeling off during construction. In addition, the strength of the reinforcing sheet 14 itself and the 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 and the peeling of the mortar 6, 7 are prevented.

On the other hand, a coating layer (not shown) which is difficult to dissolve in water and soluble in a strong alkaline solution may be formed on the surface of the water absorbent / 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 the coating layer, the water absorption / water retention property of the water absorption / water retention sheet 13 is suppressed during the coating operation of the undercoat mortar 6 due to the property of the coating layer that is difficult to dissolve 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 applying the undercoat mortar 6, the pH derived from the cement in the mortar 6
The strong alkaline aqueous solution of about 14 dissolves the coating layer, so that the water in the mortar 6 is absorbed by the water / water-holding sheet 13 and is retained. As a result, the curing and 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 when the application of the undercoat mortar 6 is completed, it is possible to continuously apply the topcoat mortar 7 after the application of the undercoat mortar 6. Therefore, even in the case of the mortar base sheet 11 having a coating layer, it is necessary to suspend the work for a long time after the application of the undercoat mortar 6 to cure and cure the undercoat mortar 6 like the conventionally used asphalt-impregnated paper 3. No, 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 is such that the copolymer of polyvinyl acetate and acrylic acid which constitutes the coating layer and polyvinyl alcohol. Adjust according to the blending 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 coated with a small amount of a water-repellent agent, or wax may be added to the coating layer at a rate of, for example, about 2% to prepare a mortar base. 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-absorbing / water-retaining sheet 13 does not need to contain excess water in advance, so that an obstacle such as insufficient water absorption at the time of mortar construction can be 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 drawings]

FIG. 1 is a cross-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 illustrating a procedure for applying mortar to the outer wall.

[Explanation of symbols]

 1 Outer wall 2 Base 6 Undercoat mortar (mortar) 7 Topcoat mortar (mortar) 11 Mortar base sheet 12 Waterproof / moisture permeable sheet 13 Water absorption / water retention sheet 14 Reinforcement sheet

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[Procedure amendment]

[Submission date] March 29, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

The present invention relates to a mortar base sheet which is arranged between a base and a mortar to be applied when an outer wall of a building such as a house is constructed.
It is characterized in that a waterproof sheet having a waterproof property, a water absorbing and water retaining sheet having a water retaining property, and a reinforced sheet for imparting a predetermined strength to the mortar underlying sheet are laminated from the above ground side.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Explanation of symbols] 1 outer wall 2 base 6 undercoat mortar (mortar) 7 topcoat mortar (mortar) 11 mortar base sheet 12 waterproof / moisture permeable sheet (waterproof sheet) 13 water absorption / water retention sheet 14 reinforced sheet

Continuation of the front page (72) Inventor Morihisa Otsuka 33-66, 33-shashacho, Fukui City, Fukui Prefecture Fukubi Chemical Industry Co., Ltd.

Claims (4)

[Claims] 1. A mortar base sheet disposed between a base and a mortar to be applied when applying mortar to an outer wall of a building such as a house, which is waterproof and moisture permeable from the base side. A mortar base sheet, comprising: a waterproof / moisture permeable sheet having water absorption, a water absorption / water retention sheet having water retention, and a reinforced sheet imparting predetermined strength to the mortar base sheet. 2. The mortar base sheet according to claim 1, wherein a coating layer which is difficult to dissolve in water and which dissolves in a strong alkaline solution is formed on the surface. 3. The coating layer is formed by adding a polyvinyl alcohol to a copolymer of polyvinyl acetate and acrylic acid.
The described mortar base sheet. 4. The mortar base sheet according to claim 1, wherein water repellency is imparted to the surface.