JPH1161061A - Adhesive sheet and decorative-aggregate-mounted sheet prepared by using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an adhesive sheet into which a decorative aggregate can be deeply buried and which can be easily peeled off after laying concrete by laminating a hot melt adhesive layer and hot melt composition layer having compatibility with the hot melt adhesive layer and containing a blowing agent on a flexible heat-resistant sheety support in the given order. SOLUTION: It is desirable that the hot melt adhesive layer and the hot melt composition layer soften at 40-100 deg.C and that the blowing agent blows at 100-160 deg.C. To prepare a decorative-aggregate-mounted sheet by using the adhesive sheet, a method is adopted which comprises mounting at least one decorative aggregate selected among natural stone, ceramics, glass and plastics on the surface of the hot melt composition of the adhesive sheet and softening the hot melt adhesive layer and the hot melt composition layer by heating to effect both the sinking of the aggregate into the layers and the blowing of the blowing agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive sheet used for manufacturing landscape decorative concrete or the like whose surface is decorated with decorative aggregates such as natural stones and ceramics, and a decorative aggregate mounting sheet using the sheet.

[0002]

2. Description of the Related Art A method called a washing method has been used as one of the methods for decorating a concrete surface with a decorative aggregate or the like. In this method, concrete (including mortar) into which aggregate was kneaded was poured into a formwork, and while it was semi-hardened, the concrete on the surface (including mortar) was washed away and a part of the aggregate was removed. Was exposed. In recent years, after casting concrete mixed with aggregate,
A method of spraying a concrete setting retarder on the surface has been adopted. Further, a special sheet called a curing retardation sheet has been used in place of the curing retardant. In these methods, the hardening of the concrete surface is delayed, and when only the inner concrete hardens, the unhardened concrete surface layer is washed away to expose a part of the aggregate.

[0003] In recent years, the present applicant has filed a special decorative aggregate mounting sheet applicable to the exposure of concrete decorative aggregate and a decorative aggregate exposing method using the same, which is not based on washing out (Japanese Patent Laid-Open No. Hei 6-1994). 134907). This method forms a hot melt adhesive layer on a flexible heat-resistant sheet-like support,
Create a decorative aggregate mounting sheet in which the decorative aggregate is partially embedded in this adhesive layer, install it in a formwork, etc., drive concrete into the aggregate mounting side of the sheet and cure it. The support and the adhesive layer are separated from the decorative aggregate and the concrete, so that the decorative aggregate is exposed on the surface of the concrete. In this method, the portion of the decorative aggregate that was exposed while being mounted on the sheet is embedded in concrete, and conversely, the portion of the decorative aggregate that was embedded in the adhesive layer of the decorative aggregate mounting sheet. The portion is exposed to the concrete surface by removing the support and the adhesive layer, and serves to decorate the concrete surface.

[0004]

In the method using the decorative aggregate mounting sheet, the decorative aggregate is partially embedded in the adhesive layer, and finally, the embedded portion is exposed from concrete. In order to obtain a sufficient degree of exposure, it is necessary to change the thickness of the adhesive layer according to the particle size of the decorative aggregate. Therefore, it is necessary to increase the thickness of the adhesive layer when the particle size of the decorative aggregate increases, but when the thickness of the adhesive layer exceeds a certain level, the adhesive layer is peeled off from the concrete and decorative aggregate. The force will increase, making it difficult to peel off,
It is easy for a part of the adhesive to remain on the concrete side (paste residue).

[0005] An object of the present invention is to solve the above-mentioned problems of the prior art, and to embed decorative aggregates deeply in an adhesive sheet, and to easily peel off the adhesive sheet after casting concrete. It is an object of the present invention to provide an adhesive sheet that can be used and a decorative aggregate mounting sheet manufactured using the same.

[0006]

The object of the present invention is to form a hot melt adhesive layer on a flexible heat-resistant sheet-like support, contain a foaming agent on the hot melt adhesive layer, and A hot-melt composition layer having compatibility with the hot-melt adhesive layer is laminated to form an adhesive sheet, a decorative aggregate is embedded by heating from the hot-melt composition layer side of the adhesive sheet, and the blowing agent Can be solved by producing a decorative aggregate-mounted sheet by foaming the sheet.

In the above-mentioned adhesive sheet, it is desirable that the hot melt adhesive layer and the hot melt composition layer soften at a temperature of 40 ° C. to 100 ° C. If the softening point is lower than 40 ° C., the sheet may be softened before use. Therefore, in consideration of ease of handling, the softening point is desirably 40 ° C. or higher. Conversely, if the softening point is higher than 100 ° C, the embedding temperature of the decorative aggregate in the hot melt layer must be increased accordingly, but embedding the decorative aggregate at a high temperature will cause thermal degradation of the hot melt layer. However, in practice, the softening point is desirably 100 ° C. or lower because of the drawback of increasing the heat energy consumption.

Further, in the above-mentioned adhesive sheet, it is desirable that the foaming agent foams at a temperature of 100 ° C. to 160 ° C. If the foaming temperature is lower than 100 ° C., there is a problem in work such as a risk of foaming during coating, and the foaming temperature is desirably 100 ° C. or higher. Conversely, if the foaming temperature is higher than 160 ° C, the heating temperature for foaming must be 160 ° C or higher.However, heating at a temperature higher than 160 ° C may cause thermal deterioration of the hot melt layer, Since there are drawbacks such as the need to increase the energy, the foaming temperature is desirably 160 ° C. or less in practical use.

The softening temperature of the hot-melt adhesive layer and the hot-melt composition layer and the foaming temperature of the foaming agent are limited by the sinking of the decorative aggregate into the adhesive sheet and the foaming of the adhesive sheet by heating the adhesive sheet. It is also preferable for balancing. That is, after placing the decorative aggregate on the surface of the hot melt composition layer of the adhesive sheet having the softening temperature and the foaming temperature limited as described above, when the temperature is raised from room temperature to the foaming temperature of the foaming agent or more. First, the hot-melt adhesive layer and the hot-melt composition layer soften, and then the foaming agent foams, so the foaming occurs after the decorative aggregate sinks into the layer,
As a result, the decorative aggregate is embedded deeper into the layer.

In the method of producing a decorative aggregate mounting sheet using the above-mentioned adhesive sheet, the surface of the hot-melt composition layer of the adhesive sheet is provided with at least one kind selected from natural stone, ceramics, glass and plastics. The decorative aggregate is placed, and as described above, the hot melt adhesive layer and the hot melt composition layer are softened by heating, the aggregate is submerged in those layers, and the foaming agent is foamed to form the decorative aggregate. Obtain a mounting sheet.

The embedding depth of the decorative aggregate can be adjusted by the thickness of the hot melt adhesive layer, the thickness of the hot melt composition layer, and the content of the foaming agent. When the decorative aggregate is embedded at a depth of 1/3 to 2/3 of the particle size, the decorative aggregate in the final form is 2/3 to 1/3 of the particle size in the concrete.
/ 3 embedded and exposed from the concrete 1/3 to 2/3 of the particle size, as a result, the concrete has sufficient strength to hold the decorative aggregate and the decorative effect of the decorative aggregate on the concrete surface. Become.

As described above, by implementing the above solution, the decorative aggregate can be buried deep in the adhesive sheet, and the foamed portion of the adhesive sheet is easily deformed. The peeling of the adhesive sheet from the concrete and decorative aggregate in the process becomes easy, and the adhesive residue is eliminated.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The above-mentioned hot melt adhesive layer can be prepared by heating and melting a hot melt adhesive and applying it to a flexible support by a calender, a hot melt coater or the like. The hot melt composition layer containing a foaming agent can be easily prepared by dissolving or dispersing the composition in a solvent, applying the composition on a release paper, drying and transferring the composition onto the adhesive layer. it can.

When the decorative aggregate is spread on the hot melt composition layer and then heated, the hot melt adhesive layer and the hot melt composition layer are melted, and the decorative aggregate is self-weighted in the layer. Sinks in. At this time, the hot-melt adhesive layer and the hot-melt composition layer are mixed, and when the temperature reaches the decomposition temperature of the foaming agent, the mixed layers are foamed to increase the thickness. It is embedded deeper into the layer. In this way, a decorative aggregate mounting sheet is obtained in which the decorative aggregate is embedded at a sufficient depth and the adhesive sheet can be easily peeled off from the concrete and the decorative aggregate after the concrete is cast.

As a material compatible with the above-mentioned flexible heat-resistant sheet-like support, there is a sheet made of a plastic film such as polyethylene terephthalate, stretched polypropylene and cross-linked polyethylene. Any of these can be used, but a plastic film such as polyethylene terephthalate having high mechanical strength and excellent heat resistance and water resistance is particularly suitable.

Materials suitable for the above foaming agents are azodicarbonamide, azobisisobutyronitrile, dinitrosopentamethylenetetramine, N, N'-dinitroso-N, N '
-Dimethyl terephthalamide, p-toluenesulfonyl hydrazide, p, p'-oxybis (benzenesulfonyl hydrazide), hydrazolcarbonamide, p-toluenesulfonyl azide, acetone-p-sulfonyl hydrazone and the like can be used. The foaming temperature can be adjusted by mixing one or more of these, and further adding a foaming aid as needed.

Next, the present invention will be described in detail with reference to specific examples. These examples show a part of the present invention, and the present invention is of course not limited to these.

[0018]

【Example】

Example 1 Styrene-butadiene-styrene block copolymer 100
A composition consisting of 40 parts by weight of petroleum resin, 90 parts by weight of naphthenic oil, 20 parts by weight of aromatic oil, and 1 part by weight of an antioxidant is kneaded well using a kneader to produce a hot melt adhesive. did. The adhesive is 50μm thick and 50μm wide.
An adhesive layer was formed on a 0 mm polyethylene terephthalate film using a calender to a thickness of about 600 μm. On the other hand, 100 parts by weight of styrene / butadiene / styrene block copolymer, 40 parts by weight of petroleum resin, 50 parts by weight of foaming agent (Exceler q # 25 manufactured by Eiwa Chemical Co., Ltd.), 90 parts by weight of naphthenic oil, antiaging agent Dissolve 1 part by weight in toluene, disperse, and use a comma coater on release paper for about 100
Coating was performed so as to have a dry coating thickness of μm, and the coating film was transferred to the adhesive layer to prepare an adhesive sheet.

The above adhesive sheet is cut into a size of 300 mm × 300 mm, a natural stone having a particle size of about 10 mm is sprinkled on the coating surface, and heated in an electric furnace at 140 ° C. for 20 minutes to form a layer in which the natural stone is foamed. Among them, a natural stone-mounted sheet embedded in about 1/3 of the particle size was obtained.

Example 2 Styrene / butadiene / styrene block copolymer 100
A hot melt adhesive was prepared by sufficiently kneading a composition comprising 20 parts by weight of a petroleum resin, 20 parts by weight of a naphthenic oil, and 1 part by weight of an antioxidant using a kneader. The adhesive was applied on a polyethylene terephthalate film having a thickness of 50 μm and a width of 500 mm to a thickness of about 600 μm using a calendar to form an adhesive layer. On the other hand, 100 parts by weight of a styrene / butadiene / styrene block copolymer, 20 parts by weight of a petroleum resin, 50 parts by weight of a foaming agent (Exceler q # 25 manufactured by Eiwa Chemical Co., Ltd.), 20 parts by weight of a naphthenic oil, and an antioxidant 1 part by weight is dissolved and dispersed in toluene, coated on a release paper using a comma coater to a dry film thickness of about 100 μm, and the coated film is transferred to the adhesive layer to form an adhesive sheet. Produced.

The above adhesive sheet is cut into a size of 300 mm × 300 mm, a natural stone having a particle size of about 10 mm is sprinkled on the coating surface, and heated in an electric furnace at 140 ° C. for 20 minutes to form a layer in which the natural stone is foamed. Among them, a natural stone-mounted sheet embedded in about 1/3 of the particle size was obtained.

Example 3 Styrene / butadiene / styrene block copolymer 100
Parts by weight, 40 parts by weight of petroleum resin, 100 parts by weight of naphthenic oil, 30 parts by weight of aromatic oil, and 1 part by weight of an antioxidant were kneaded well using a kneader to prepare a hot melt adhesive. . The adhesive is 50μm thick and 500m wide
An adhesive layer was formed on a polyethylene terephthalate film having a thickness of about 600 μm by using a calender. On the other hand, 100 parts by weight of styrene / butadiene / styrene block copolymer, 40 parts by weight of petroleum resin, 50 parts by weight of a foaming agent (Exceler q # 25 manufactured by Eiwa Chemical Co., Ltd.), 100 parts by weight of naphthenic oil, 100 parts by weight of aromatic 20 parts by weight of oil and 1 part by weight of an antioxidant are dissolved and dispersed in toluene, and coated on a release paper using a comma coater so as to have a dry film thickness of about 100 μm. This was transferred to a layer to produce an adhesive sheet.

The above adhesive sheet is cut into a size of 300 mm × 300 mm, a natural stone having a particle size of about 10 mm is sprinkled on the coating surface, and heated in an electric furnace at 140 ° C. for 20 minutes to form a layer in which the natural stone is foamed. Among them, a natural stone-mounted sheet embedded in about 1/3 of the particle size was obtained.

Example 4 Styrene / butadiene / styrene block copolymer 100
A composition comprising 40 parts by weight of a petroleum resin, 90 parts by weight of a naphthenic oil, 20 parts by weight of an aromatic oil, and 1 part by weight of an antioxidant was kneaded well using a kneader to prepare a hot melt adhesive. . The adhesive is 50μm thick and 500m wide
An adhesive layer was formed on a polyethylene terephthalate film having a thickness of about 600 μm by using a calender. On the other hand, 100 parts by weight of styrene / butadiene / styrene block copolymer, 40 parts by weight of petroleum resin, 50 parts by weight of blowing agent (p-toluenesulfonylhydrazide), 90 parts by weight of naphthenic oil, and 1 part by weight of antioxidant in toluene It was dissolved, dispersed, and coated on a release paper using a comma coater so as to have a dry coating thickness of about 100 μm, and the coating was transferred to the adhesive layer to prepare an adhesive sheet.

The above adhesive sheet is cut into a size of 300 mm × 300 mm, a natural stone having a particle size of about 10 mm is sprinkled on the coating surface, and heated in an electric furnace at 120 ° C. for 20 minutes to form a layer in which the natural stone is foamed. Among them, a natural stone-mounted sheet embedded in about 1/3 of the particle size was obtained.

Example 5 Styrene / butadiene / styrene block copolymer 100
A composition comprising 40 parts by weight of a petroleum resin, 90 parts by weight of a naphthenic oil, 20 parts by weight of an aromatic oil, and 1 part by weight of an antioxidant was kneaded well using a kneader to prepare a hot melt adhesive. . The adhesive is 50μm thick and 500m wide
An adhesive layer was formed on a polyethylene terephthalate film having a thickness of about 600 μm by using a calender. On the other hand, 100 parts by weight of a styrene / butadiene / styrene block copolymer, 40 parts by weight of a petroleum resin, 50 parts by weight of a blowing agent (Vinihole DW # 6 manufactured by Eiwa Chemical Co., Ltd.), 90 parts by weight of a naphthenic oil, an antioxidant Dissolve 1 part by weight in toluene, disperse, and use a comma coater on release paper for about 100
Coating was performed so as to have a dry coating thickness of μm, and the coating film was transferred to the adhesive layer to prepare an adhesive sheet.

The above adhesive sheet was cut into a size of 300 mm × 300 mm, and a natural stone having a particle size of about 10 mm was sprinkled on the adhesive sheet.
Heating was performed for 20 minutes in an electric furnace at ℃ to obtain a natural stone-mounted sheet in which natural stone was embedded in the foamed layer to an average of about 1/3 of the particle size.

Comparative Example 1 Styrene / butadiene / styrene block copolymer 100
A composition comprising 40 parts by weight of a petroleum resin, 90 parts by weight of a naphthenic oil, 20 parts by weight of an aromatic oil, and 1 part by weight of an antioxidant was kneaded well using a kneader to prepare a hot melt adhesive. . The adhesive is 50μm thick and 500m wide
An adhesive sheet was prepared by coating the film on a polyethylene terephthalate film having a thickness of about 800 μm using a calender.

The above-mentioned adhesive sheet was cut into a size of 300 mm × 300 mm, and a natural stone having a particle size of about 7 mm was sprinkled on the cut sheet at 140 ° C.
Was heated in an electric furnace for 20 minutes to obtain a natural stone-mounted sheet in which natural stone was embedded in the adhesive layer.

Various tests described below were performed on the samples obtained in the above Examples and Comparative Examples, and the obtained results are shown in Table 1. In Table 1, "seed stone" means a decorative stone material, that is, a natural stone in this case.

Sheet peeling force test ···· Pour mortar to a thickness of about 30 mm on the natural stone-mounted sheet, and at 60 ° C
After curing for 4 hours, the adhesive sheet was peeled off from the mortar surface at an angle of 90 ° C. after curing, and the peeling force was measured.

Seed stone exposure degree test ···· Pour mortar to a thickness of about 30 mm on the natural stone-mounted sheet,
After curing for 4 hours at ℃, the adhesive sheet was peeled off from the mortar surface to expose the natural stone, and the degree of exposure was visually observed.

Glue residue test: Pour mortar into the natural stone-mounted sheet to a thickness of about 30 mm, cure and cure at 60 ° C. for 4 hours, peel off the adhesive sheet from the mortar surface after curing, and remove the adhesive sheet from the mortar surface. The presence or absence of glue residue was visually checked.

[0034]

[Table 1]

As is evident from the results for Examples 1 to 5 in Table 1, natural stone is embedded in the hot melt layer by heating and the natural stone mounting sheet produced by foaming the hot melt layer is used to reduce the mortar surface. Exposure of the natural stone from the surface was sufficient, and the sheet was easily peeled when the natural stone was exposed. In contrast, in the case of Comparative Example 1, since the embedding of the natural stone in the adhesive layer was shallow, the exposure of the natural stone was slightly poor,
Moreover, since the adhesive layer was not foamed, the adhesive strength was strong, and as a result, adhesive residue was confirmed.

[0036]

As described above, in the production of exposed aggregate exposed concrete, the problem of the prior art can be solved by using the adhesive sheet and the decorative aggregate mounting sheet according to the present invention. The surface of the decorative aggregate can be sufficiently exposed, and the sheet for exposing the decorative aggregate to the concrete surface can be easily peeled off.

Claims (4)

[Claims] 1. A hot-melt adhesive layer is formed on a flexible heat-resistant sheet-like support, and on the hot-melt adhesive layer,
An adhesive sheet formed by laminating a hot melt composition layer containing a foaming agent and having compatibility with the hot melt adhesive layer. 2. The adhesive sheet according to claim 1, wherein the hot melt adhesive layer and the hot melt composition layer soften at a temperature of 40 ° C. to 100 ° C. 3. The adhesive sheet according to claim 1, wherein said foaming agent foams at a temperature of 100 ° C. to 160 ° C. 4. A hot-melt adhesive layer is formed on a flexible heat-resistant sheet-like support, and on the hot-melt adhesive layer,
A hot melt composition layer having compatibility with the hot melt adhesive layer and containing a foaming agent is laminated to form an adhesive sheet, the adhesive sheet is heated, and the hot melt is added to the adhesive sheet. A decorative aggregate mounting sheet in which a part of each grain of at least one type of decorative aggregate selected from natural stone, ceramics, glass, and plastics is embedded from the composition layer side and the foaming agent is foamed.