JPH0663321B2 - Adhesive bonding method for exterior waterproof sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is suitable for applying a waterproof layer to an outer wall surface, particularly to the surface of a porous noncombustible exterior material substrate by adhesive bonding. Regarding a method for applying and bonding an exterior waterproof decorative sheet that has an agent-impregnated part, by performing adhesive bonding without leaving the unimpregnated part in the adhesive-impregnated part substantially, excellent water resistance and waterproof properties can be obtained. It can be expressed.

<Prior Art> An acrylic emulsion is used because the outer wall surface made of a non-combustible porous material such as lightweight concrete has the advantage of being lightweight despite having the drawback of poor waterproofness. It is widely used while supplementing the waterproof property by a method such as applying the above to the outer surface. In particular, in recent years, lightweight concrete has shown remarkable growth in demand due to standardization by precast concrete method and mass production in combination with heat insulating property, lightweight property, and toughness.

As a result of various studies in order to impart waterproofness to such a porous outer wall surface, the present inventors first applied a waterproof coating on the surface of the fibrous member and formed a waterproof layer by infiltration, A waterproof decorative sheet having a resin coating on the surface of the waterproof layer (Japanese Patent Laid-Open No. 61-151351) was proposed, and a waterproofing method using the same was also proposed.

<Problems to be Solved by the Invention> In the conventional method of applying a coating material to the outer wall surface to impart waterproofness, the application method requires curing, or due to the occurrence of a paint mist, For example, there are problems such as pollution. Furthermore, because of the fact that scaffolding is used during painting work, so-called uneven scaffolding causes uneven coating, which not only causes aesthetic problems, but also causes a problem in waterproofness due to light and shade in the coating film. It was

Further, also in the waterproof decorative sheet proposed by the present inventors, impregnation of the waterproof coating material to the fibrous member in forming the waterproof layer, depending on the characteristics of the fibrous member used,
There was a case where the waterproofing effect was not performed uniformly and effectively, and the waterproofing effect was partially incomplete. In addition to this, this waterproof decorative sheet is used for lightweight cellular concrete board (AL
When used by bonding with an adhesive to the outer wall surface composed of a porous outer wall material such as (C plate), depending on the characteristics of the fibrous member, delamination may occur between the waterproof decorative sheet and the adhesive layer, resulting in waterproofing. There was a technical problem to be solved that the effect could not be fully achieved.

Therefore, in order to impart waterproofness without any practical problem to the outer wall surface composed of a porous wall material such as lightweight concrete which is extremely useful, by applying it in advance or on-site, the above technically The advent of a new waterproof decorative sheet used for imparting waterproofness to overcome the above-mentioned drawbacks has been long awaited.

In order to meet this expectation, the present inventors have already proposed a new waterproof decorative sheet in Japanese Patent Application No. 61-272646 (Japanese Patent Laid-Open No. 63-125332), and It is now possible to overcome. However, even when the waterproof decorative sheet is adhered to the outer wall surface, there still remains a problem that the waterproof property is still uneven and the waterproof property is often incomplete. is there.

<Means for Solving Problems> As a result of intensive studies in view of such a situation, the present inventors have found that when an exterior waterproof decorative sheet is adhesively bonded, the waterproof impregnated portion of the waterproof decorative sheet is adhered to the adhesive impregnated portion. The unimpregnated part of the adhesive is
It was found that the above problems are strongly related to the phenomenon that they remain depending on the amount of adhesive used, the viscosity of the adhesive, etc. The problem was solved by bonding the sheets together.

That is, the present invention comprises a fibrous sheet member (1), a waterproof layer (2) and a decorative layer (3), and a part of the fibrous sheet member (1) overlaps with the waterproof layer (2) and is attached. The fibrous sheet member (1) is exposed on the wearing surface side and the waterproof coating is not infiltrated (8)
The exterior decorative sheet characterized by using the remaining waterproof decorative sheet, and adhering to the outer wall surface (7) without substantially leaving the unimpregnated part of the adhesive in the waterproof coating uninfiltrated part (8). This is a method of bonding and attaching a waterproof decorative sheet.

The fibrous sheet member (1) referred to in the present invention is a synthetic fiber such as vinylon fiber, acrylic fiber, vinyl chloride fiber, polyester fiber, rayon staple, acetate fiber,
A sheet-like material obtained by using cellulose-based fibers such as pulp, glass fibers, rock wool, ceramic fibers, inorganic fibers such as carbon fibers as constituent materials, for example, sheets obtained in the form of woven or paper-like, non-woven fabric A material is used.

These sheet-like materials have a basis weight of 10 to 100 g / m from the viewpoint of strength, uniform and reliable impregnation of paint and adhesive.
² is preferable, and 40-60 g / m ² is more preferable. Further, the air permeability is preferably 1 second or less, which is also a condition that is preferably used. In this case, the waterproof coating material infiltrated portion (8) in the construction method of the present invention is more easily impregnated with the adhesive, This is preferable because the effects of the present invention can be enjoyed more.

The thickness of the fibrous sheet member (1) is 0.03 to 1.00 mm,
Particularly, those having a thickness of 0.05 to 0.30 mm are more preferably used. In forming the waterproof coating material impregnated portion (4) of the fibrous sheet member (1), leave the waterproof coating material infiltrated portion (8) in the thickness direction in an amount of 30 to 70%. Is preferred. If the waterproof coating uninfiltrated portion (8) is less than 30%, the effect of gluing fibers with the adhesive to improve the adhesive strength can be expected, but it is insufficient, and especially the adhesive strength when hydrated is unsatisfactory. Becomes If the uninfiltrated portion (8) exceeds 70%, the uninfiltrated portion (8) may not be completely impregnated with the adhesive, and the adhesiveness, particularly the adhesiveness when hydrated, is unsatisfactory. However, it is not preferable because it causes swelling and peeling.

The outer wall surface referred to in the present invention is not particularly limited, but is a non-combustible exterior material substrate, concrete outer wall surface body, lightweight cellular concrete plate (ALC plate), precast concrete plate (PC plate), asbestos cement Plates (slate boards), gypsum board, glass fiber reinforced gypsum board (GRG board), glass fiber reinforced concrete board (GRC board),
Examples include pulp cement plates, plates mainly composed of calcium silicate, and metal plates (including metal plates whose surface is coated with non-combustible or flame-retardant resin). Above all, AL
A porous outer wall such as a C plate is more preferable in terms of properties such as heat insulation, lightness, and robustness, and the waterproof decorative sheet for exterior is strongly water-resistant adhered and bonded by the adhesive bonding method of the present invention. The disadvantage that the plate is inherently poor in waterproofness is eliminated, and a very suitable outer wall is constructed.

In the present invention, in order to sufficiently permeate and impregnate the waterproof paint non-infiltrated portion (8) with the adhesive non-impregnated portion (8), the non-infiltrated portion (8) is not substantially left. )
The amount of adhesive applied to the surface is determined by the fibrous sheet member (1).
It is determined by the thickness of the film and the proportion of the uninfiltrated part (8) in this thickness direction.
It is necessary to be 500 to 500 g / m ² . More preferably, 20
It is in the range of 0 to 400 g / m ² . The appropriate amount of adhesive varies depending on the degree of coarseness and denseness of the outer wall surface (degree of porosity, etc.), various characteristics and thickness of the waterproof coating uninfiltrated portion (8) of the fibrous sheet member (1), but 100 g / m ² If the amount of the adhesive is less than that, it is impossible to substantially eliminate the portion not impregnated with the adhesive after being applied to the uninfiltrated portion (8). It is not preferable to use the adhesive in excess of 500 g / m ² because not only unnecessarily excessive presence of the adhesive increases the time required for strong adhesion but also it is uneconomical.

The adhesive bonding construction method of the exterior waterproof decorative sheet of the present invention,
The purpose is to bond a waterproof decorative sheet to the outer wall surface, and it is preferable to use an adhesive having sufficient water resistance from various viewpoints. As the water resistant adhesive,
Aqueous emulsion type acrylic resin adhesives, ethylene-vinyl acetate resin adhesives, solvent type adhesives, for example, synthetic rubber adhesives such as chloroprene rubber, and as a curable adhesive. Can be an epoxy resin adhesive. In particular, an acrylic resin-based aqueous emulsion type adhesive is more preferable from the viewpoint of workability on site. If necessary, powdery fillers such as calcium carbonate powder, titanium oxide powder, aluminum hydroxide powder and pigments are added to these adhesives before use.

The sticking degree of the adhesive is preferably 1000 to 10000 cps. (Centipoise).

The waterproof coating for forming the waterproof layer (2) used in the present invention is preferably a water-based elastic coating, and the emulsion used for this is an emulsion used in a region where the amount of resin components is relatively large, and the coating has elasticity. It is preferably used as long as it has waterproofness, and examples thereof include acrylic emulsion, acrylic / styrene emulsion, acrylic / vinyl acetate emulsion, ethylene / vinyl acetate emulsion, and Veova / vinyl acetate emulsion. Among them, acrylic emulsion is more preferably used.

The waterproof paint is obtained by blending these emulsions with an inorganic pigment or / and a filler such as titanium oxide or calcium carbonate, and adjusting the viscosity in the range of 3000 to 4000 cps. The member (1) is impregnated to a predetermined depth, and a waterproof layer (2) is formed by coating the surface of the fibrous sheet member (1).

As an emulsion for a cosmetic coating used for forming the cosmetic layer (3) of the present invention, it is necessary to add a coating having no tackiness, elasticity, and antifouling property from the viewpoint of storability and workability. Although the mixing ratio of the filler and the like is different, the emulsion for the waterproof layer (2) is used. In particular, an emulsion having a relatively high hardness such as styrene or an acrylic emulsion, to which a plasticizer that volatilizes after application and reduces the remaining amount is added is more preferably used. The viscosity of this cosmetic paint is adjusted to, for example, 3500 to 4500 cps.
The adjusted paint is applied on the waterproof layer (2) to form the decorative layer (3).

According to the method of the present invention, a state after the exterior waterproof decorative sheet is adhesively bonded to the outer wall surface is shown in a sectional view in FIGS.
As shown in the figure. In the case of the porous outer wall, a part of the adhesive is also impregnated into the outer wall to improve the adhesion state, but the illustration of the impregnated portion of the adhesive in the outer wall is omitted in this case.

<Operation and Effect of the Invention> According to the method for adhering and bonding the exterior waterproof decorative sheet of the present invention, as shown in FIGS. 1 and 2, the waterproof paint non-infiltrated portion (8) is adhered by the infiltration of the adhesive. By forming the agent-impregnated portion and bonding the fibers with the adhesive to form a part or the whole of the adhesive layer (6), the delamination phenomenon between the adhesive layer (6) and the decorative sheet is surely performed. It was to be prevented. Also,
The adhesive-impregnated part inside the decorative sheet does not leave a part that is not impregnated with adhesive, and the variation in waterproofness and incomplete waterproofness seen on the outer wall where the decorative sheet is adhered and pasted by the conventional method. It has no water resistance and shows satisfactory waterproofness and water resistance.

<Examples> Hereinafter, specific materials and manufacturing methods of the waterproof waterproof decorative sheet of the present invention will be described in detail with reference to Examples, but the invention is not limited to these Examples. The parts are shown on a weight basis. In addition, in order to explain the state in which the exterior waterproof decorative sheet is adhered and adhered to the outer wall surface by the method for adhering and bonding the exterior waterproof decorative sheet of the present invention, both drawings are shown in FIGS. 1 and 2. It is shown by a sectional view.

Example 1 A glass wool non-woven fabric having a basis weight of 50 g / m ² and an air permeability of 0.5 seconds and a thickness of 0.07 mm was coated on one surface with a waterproof coating material having the following mixing ratio using a roll coater to impregnate the inside of the non-woven fabric. .

Acrylic resin emulsion 100 parts Titanium oxide 10 parts Calcium carbonate 90 parts Pigment 0.8 parts Surfactant 0.2 parts Viscosity 3000 to 4000 cps. When applied and impregnated, the thickness of the nonwoven fabric is 30 to 30
The coating operation time was selected and operated so as to reach 70%.
Then, it was dried in a hot air dryer with hot air at 115 ° C. for 3 minutes. The depth of the non-woven fabric impregnated with the adhesive in the thickness direction was about 50% of the thickness.

Next, a coating composition for cosmetics having the following blending ratio was coated on the dry coated surface using a roll coater, and then dried in a hot air dryer at 115 ° C. for 3 minutes.

Styrene / acrylic resin emulsion 100 parts Titanium oxide 10 parts Calcium carbonate 50 parts Pigment 0.8 parts Surfactant 0.2 parts Plasticizer 8 parts Viscosity 3500 to 4500 cps. The resulting exterior waterproof decorative sheet has an uneven pattern on the surface and is beautiful. It was a sheet.

Then, the backside of the obtained exterior waterproof decorative sheet is uniformly coated with a roll coater of 300 g / m ² of the following compounding ratio to impregnate it, and then used as a nonflammable outer wall surface (7). It was attached to a precast concrete board (PC board) and dried for 14 days at a temperature of 20 ° C and a humidity of 65%.

Acrylic emulsion 100 parts Calcium carbonate 100 parts Thickener 0.3 parts Additive 0.8 parts Viscosity 600 cps. About this decorative sheet laminated PC board after drying, JIS A 6910
Tested according to 5.8 (Adhesion test), 12.5kgf / cm ²
Got the value of.

In order to more surely grasp the situation in the cross section of the waterproof decorative sheet laminated PC board, after separately coloring the adhesive in red under the same conditions and drying the same, the cross section was inspected and No unimpregnated part was found in the adhesive-impregnated part.

The PC board having the obtained exterior decorative board on the surface is extremely excellent in water resistance and waterproofness, and when used between the PC boards obtained by the construction method of the present invention, it is water resistant and waterproof. No variability or the like that was a substantial problem of sex was observed.

Example-2 A waterproof decorative sheet for exterior packaging was carried out in the same manner as in Example-1, except that the adhesive having the following blending ratio was used and the adhesive coating amount on the back surface of the decorative sheet was 200 g / m ^2. A laminated PC board was obtained.

Acrylic emulsion 100 parts Thickener 0.8 parts Viscosity 4500 cps. When a cross-section was inspected using a colored adhesive under the same conditions as in Example-1, the adhesive was impregnated on the entire surface of the non-woven fabric. No unimpregnated part was observed.
A value of 11.0 kgf / cm ² was obtained according to JIS A 6910 5.8 (adhesion test).

Example 3 A lightweight cellular concrete plate (ALC plate) was used in place of the PC plate, and the adhesive coating amount on the back surface of the decorative sheet was 495 g /
except that the m ² was carried out in the same manner as in Example 1.

No unimpregnated part of the adhesive was found on the cross section as in Example-1. When an adhesion test was conducted according to JIS A 6910 5.8, ALC was destroyed and a value of 6.5 kg / cm ² was obtained.

Except that the adhesive application weight to Example -4 the decorative sheet backside and 420 g / m ² was carried out as described in Example 3. A value of 7.0 kgf / cm ² was obtained in the above adhesion test and the ALC plate was broken.

[Brief description of drawings]

FIG. 1 and FIG. 2 are cross-sectional views for explaining a state in which the exterior waterproof decorative sheet is adhesively attached to the outer wall surface by the method for adhering the exterior waterproof decorative sheet according to the present invention. (1) Fibrous sheet member, (2) Waterproof layer (3) Decorative layer, (4) Waterproof paint impregnated part (6) Adhesive layer, (7) Outer wall surface (8) Waterproof paint uninfiltrated part

Claims (1)

[Claims] 1. A fibrous sheet member (1) comprising a fibrous sheet member (1), a waterproof layer (2) and a decorative layer (3).
Of the waterproof coating sheet, in which a part of the waterproof sheet overlaps the waterproof layer (2) and the fibrous sheet member (1) is exposed on the sticking surface side and the waterproof coating uninfiltrated portion (8) remains. A method for adhering and bonding an exterior waterproof decorative sheet, which comprises adhering to the outer wall surface (7) without substantially leaving the unimpregnated portion of the adhesive in the unwetted portion (8).