JP6063601B1 - Removable adhesive sheet for floor - Google Patents

Abstract

The second floor finishing material is less likely to peel off from the first floor finishing material due to the excellent adhesion of the second floor finishing material to the first floor finishing material. The removability is good and the workability for replacing the second floor finish is improved. A floor releasable adhesive sheet 10 includes a first floor finishing material 21 provided on the surface of a floor surface 13 and a second floor finishing material provided on the surface side of the first floor finishing material 21. The adhesion layer 12 is formed on the back side of the sheet-like base material layer 11 interposed between them. The adhesion layer 12 contains 5 to 30 parts by mass of an acrylic resin emulsion and 0.01 to 0.2 parts by mass of cellulose nanofibers with respect to 100 parts by mass of natural rubber latex. The glass transition temperature of the acrylic resin emulsion is -70 ° C to -40 ° C, and the thickness of the adhesion layer is 50 to 150 µm. [Selection] Figure 3

Description

  The present invention is used for adhering a second floor finishing material such as a plastic floor tile to the surface of a first floor finishing material provided on the surface of a floor surface such as a concrete floor base material. The present invention relates to a re-peelable adhesive sheet for floors having an adhesive force and excellent removability.

  Conventionally, laying-type plastic floor tiles have been constructed in a wide range of applications from various facilities including commercial facilities to general houses. Examples of the plastic floor tile include a polyvinyl chloride resin tile (so-called P tile), a tile carpet (50 cm × 50 cm, etc.) and a plastic long floor tile (15 cm × 900 cm, etc.). These plastic floor tiles are used as a second floor finish for the purposes of simple remodeling, remodeling, and advertising, by sticking them on the existing floor (the first floor finish such as wood). Is done. When repair is required during renovation, it is not necessary to replace the entire surface, and a partial replacement method is adopted in which the sheet at the location requiring repair is peeled off and replaced with a new sheet.

  Generally, when a floor finish (second floor finish) is applied to an existing floor (first floor finish), a peel-up bond (removable adhesive) is used. However, since the adhesive remains on the surface of the floor (first floor finish) after peeling off the floor finish (second floor finish) at the time of replacement, it is used to add warm water or a special remover. There is a problem that workability is extremely poor since a process of removing using the process is added.

  In order to solve the above-mentioned problems, a floor releasable sheet having good removability when renewing a floor finish (second floor finish) and improving replacement workability, and the same were used. Floor finishing construction methods have been proposed (see, for example, Patent Document 1 and Patent Document 2).

  In the floor releasable sheet shown in Patent Document 1 and Patent Document 2, the first floor finish (woody or plastic floor tile) provided on the surface of the floor, the wooden floor material, and the plastic type There is disclosed a floor releasable sheet in which an adhesive layer is formed on the back side of a sheet-like base material layer interposed between a floor tile, a tile carpet, or a second floor finishing material. In this floor releasable sheet, the adhesion layer is constituted by containing 5 to 90 parts by mass of a synthetic resin emulsion with respect to 100 parts by mass of natural rubber latex. Further, the glass transition temperature of the synthetic resin emulsion is −70 ° C. to −15 ° C., and the thickness of the adhesion layer is 50 to 150 μm. Further, the natural rubber latex is an acrylic ester or methacrylic ester modified natural rubber latex.

  In the floor releasable sheet thus configured, the adhesion layer is configured to contain the synthetic resin emulsion in a predetermined ratio with respect to the natural rubber latex, and the glass transition temperature of the synthetic resin emulsion is -70 ° C to- Since it is 15 degreeC and the thickness of a contact | adherence layer is 50-150 micrometers, it has the 2nd floor finishing after construction by having the outstanding contact | adhesion power with the 1st floor finishing material provided in the surface of a floor surface The material (wood flooring, plastic floor tiles, tile carpets, display sheets) does not peel or warp, and has excellent removability, so replacement work when renewing the second floor finish is good Since there is no stickiness (tack value is low), position adjustment when constructing the second floor finish is easy. In addition, even when used for a long time in a high-temperature environment, the removability at the time of renewal of the floor finish is sufficient and the replacement workability is good, and harmful gases such as formaldehyde are generated from the above components. Because there is nothing, it is environmentally friendly. Further, when the natural rubber latex is an acrylic ester or methacrylic ester modified natural rubber latex, the coating stability is improved and the storage stability is also improved.

JP 2013-053509 A (Claims 1 and 3, paragraphs [0022] and [0024], FIG. 3) JP 2013-122146 A (Claims 1 and 3, paragraphs [0018] and [0020], FIG. 3)

  However, in the conventional re-peelable sheet shown in Patent Documents 1 and 2, there is no problem in the re-peelability of the second floor finish after the short-term use with respect to the first floor finish. After the period of use, the adhesion of the second floor finish to the first floor finish becomes stronger, and it is difficult to peel off this second floor finish from the first floor finish when renewing the second floor finish. There was a bug. For this reason, the work efficiency at the time of re-peeling of the second floor finishing material is deteriorated, and if the adhesion of the second floor finishing material to the first floor finishing material becomes too strong, the floor re-peelable sheet breaks down. Therefore, there is a problem that the removal of the fragments becomes extremely troublesome. In addition, when an oily varnish or the like is applied to the surface of an existing floor (first floor finish) that becomes the adherend surface, the floor releasable sheet shown in the above-mentioned conventional patent documents 1 and 2 Then, the adhesion force of the second floor finishing material to the first floor finishing material increases and it becomes difficult to peel off, and if the adhesion force becomes too strong, the re-peelable sheet for flooring breaks down the material as described above. Therefore, there has been a problem that the removal of the fragments is extremely troublesome.

  The object of the present invention is that the second floor finishing material is not easily peeled off from the first floor finishing material due to the excellent adhesion of the second floor finishing material to the first floor finishing material, and the second floor finishing material is renewed. Another object of the present invention is to provide a floor re-peeling type adhesive sheet that has good re-peelability and can improve the workability of replacing the second floor finish.

  A first aspect of the present invention is a sheet interposed between a first floor finishing material provided on the surface of a floor surface and a second floor finishing material provided on the surface side of the first floor finishing material. In the floor releasable adhesive sheet in which an adhesive layer is formed on the back side of the base material layer, the adhesive layer contains 5 to 30 parts by mass of an acrylic resin emulsion with respect to 100 parts by mass of natural rubber latex, cellulose The glass transition temperature of the acrylic resin emulsion is −70 ° C. to −40 ° C., and the thickness of the adhesion layer is 50 to 150 μm. .

  In the floor releasable adhesive sheet according to the first aspect of the present invention, the adhesive layer contains 5 to 30 parts by mass of the acrylic resin emulsion with respect to 100 parts by mass of the natural rubber latex. It is a blending ratio that has both of the above properties, and the adhesion of the second floor finish to the first floor finish is excellent, and the increase in the adhesion is small over time, and the second floor finish is renewed. The removability at the time is good. As a result, it is difficult for the second floor finishing material to be peeled off from the first floor finishing material, and the workability for replacing the second floor finishing material can be improved. The excellent adhesion of the second floor finishing material to the first floor finishing material is due to the elasticity of natural rubber latex, and the air entrained with the first floor finishing material is pushed out and fixed without creating a gap. It is because it can be made. In addition, there is little increase in the above-mentioned adhesion even after time, and good re-peelability when renewing the second floor finish is good miscibility between acrylic resin emulsion and natural rubber latex, This is because the components of the adhesion layer hardly transfer to the first floor finish.

  Moreover, when the adhesion layer contains 0.01 to 0.2 parts by mass of cellulose nanofibers with respect to 100 parts by mass of natural rubber latex, the surface of the existing floor (first floor finish) that becomes the adherend surface is oily. Even when wax such as varnish is applied, the second floor finish is excellent in adhesion to the first floor finish, and the increase in the adhesion over time is small. Good removability when finishing materials are renewed. As a result, it is difficult for the second floor finishing material to be peeled off from the first floor finishing material, and the workability for replacing the second floor finishing material can be improved. Even if oil-based wax is applied to the surface of the first floor finish, the second floor finish has excellent adhesion to the first floor finish due to the elasticity of natural rubber latex. This is because the air entrained with the material can be pushed out and fixed without creating a gap. In addition, even when oil-based wax is applied to the surface of the first floor finish, there is little increase in the adhesion due to the passage of time, and the removability when renewing the second floor finish is good. Has good miscibility with acrylic resin emulsion and natural rubber latex, so that almost no component of the adhesion layer is transferred to the first floor finish, and the specific surface area of cellulose nanofiber is large, so even with a small amount of gas barrier properties. This is because the oily wax hardly transfers to the adhesion layer.

It is sectional drawing of the re-peeling type adhesive sheet for floors of this invention by which the contact | adherence layer was formed in the back surface side of a sheet-like base material, and the protective sheet was laminated | stacked on the contact layer surface. It is sectional drawing of the releasable adhesive sheet for floors of another embodiment by which the adhesion layer was further formed in the surface side of a sheet-like base material, and the protective sheet was laminated | stacked on each surface of the adhesion layer and the adhesion layer. It is explanatory drawing of the floor finishing construction method using the re-peeling type contact sheet for floors of this invention. It is explanatory drawing which shows a 90 degree peeling test method.

  Next, an embodiment for carrying out the present invention will be described with reference to the drawings. As shown in FIG. 3, the floor releasable adhesive sheet 11 of the present invention has a woody first floor finish 21 provided on the surface of the floor surface 13, and a surface side of the first floor finish 21. It is a re-peeling type adhesive sheet interposed between the provided second floor finishing material 22. In the present invention, “floor surface 13” may be composed of plywood, particle board, joist, floor base material, slab, mortar, stone, and “first floor finish 21” refers to plywood flooring, fiber Wood flooring such as board flooring and solid wood flooring, or plastic floor tiles such as cushion floor, hard vinyl tile (also called P tile), and soft vinyl tile. The second floor finish 22 is made of a wood floor (flooring), a plastic floor tile, a tile carpet, or a display sheet. Here, the “woody flooring” of the second flooring material 22 is a plywood flooring, a fiberboard flooring, or a solid wood flooring, generally having a thickness of 3 mm to 40 mm, but a thinner one or woody The same thickness as the first floor finish 21 may be used. Further, the “plastic floor tile” of the second floor finish 22 is a cushion floor, a hard vinyl tile (also called P tile), or a soft vinyl tile. Further, the “tile carpet” of the second floor finish 22 is a tile carpet having a size of 400 mm × 400 mm or 500 mm × 500 mm. Furthermore, the “display sheet” of the second floor finish 22 is, for example, goo! This is a floor advertisement sheet such as Step (registered trademark; trademark registration No. 5246641; Koyo Sangyo Co., Ltd.).

  As shown in FIG. 1, the floor re-peelable adhesive sheet 10 of the present invention has an adhesive layer 12 formed on the back side of a sheet-like base material layer 11. And this adhesion layer 12 contains 5-30 mass parts of acrylic synthetic resin emulsion with respect to 100 mass parts of natural rubber latex, Preferably it is 5-15 mass parts. Here, the content ratio of the acrylic synthetic resin emulsion with respect to 100 parts by mass of the natural rubber latex is limited to the range of 5 to 30 parts by mass. Although the removability from the material 21 is increased, the adhesion of the second floor finishing material 22 to the first floor finishing material 21 is poor, and when it exceeds 30 parts by mass, the adhesion is increased but the removability is poor. Because it becomes. That is, the adhesion layer having the above blending ratio has both high adhesion and high removability. Thus, when the adhesion layer 12 formed on the back surface side of the sheet-like base material layer 11 contains the acrylic synthetic resin emulsion in the above blending ratio with respect to the natural rubber latex, the woody material provided on the surface of the floor surface 13 Since it has excellent adhesion to the first floor finish 21, the second floor finish 22 after construction does not peel or warp, and has excellent removability, so that the second floor finish 22 The replacement work at the time of renewal becomes better. In the present invention, “adhesion” is a highly elastic or gel-like solid but not sticky, and does not create a void by extruding the air entrained between the adherend and the elasticity of the composition. Specifically, the natural rubber latex film formed on the sheet-like base material layer 11 has a high adhesion at a low pressure to a smooth surface such as a flooring material. It refers to a state that expresses sex. The film showing the above-mentioned adhesion is also characterized in that it does not involve any transfer of a pressure-sensitive adhesive component such as a normal pressure-sensitive adhesive to the surface of the base material (first floor finish) during re-peeling.

  Moreover, the said adhesion layer 12 contains 0.01-0.2 mass part of cellulose nanofiber with respect to 100 mass parts of natural rubber latex, Preferably it contains 0.02-0.1 mass part. Here, the content of cellulose nanofibers was limited to the range of 0.01 to 0.2 parts by mass with respect to 100 parts by mass of natural rubber latex. Although the adhesion of the finishing material 22 to the first floor finishing material 21 is increased, the transfer of the wax such as oil varnish applied to the surface of the first floor finishing material 21 to the adhesion layer 12 cannot be prevented, and 0.2 parts by mass is reduced. This is because if it exceeds, the transfer of the wax to the adhesion layer 12 can be prevented, but the adhesion is poor. In order to uniformly disperse cellulose nanofibers in natural rubber latex, for example, a cellulose aqueous dispersion in which 2% by mass of cellulose nanofibers are dispersed in 98% by mass of water is prepared. It is preferable to add 1 to 10 parts by mass of spraying with respect to 100 parts by mass of rubber latex. Examples of natural rubber latex include unmodified ULACOL (manufactured by Restex Co., Ltd.). Here, when an unmodified natural rubber latex is used, there is an excellent feature that adhesion is improved because of an appropriate flexibility.

  As the acrylic synthetic resin emulsion contained in the adhesion layer 12, one having a glass transition temperature in the range of −70 ° C. to −40 ° C. is used. Here, the glass transition temperature of the acrylic synthetic resin emulsion was limited to the range of −70 ° C. to −40 ° C. The reason why the adhesion layer 12 becomes too soft at a temperature lower than −70 ° C. is that the removability decreases, and −40 This is because if the temperature exceeds ° C., the adhesion layer 12 becomes hard and the adhesion decreases. Examples of the acrylic synthetic resin emulsion include an acrylate polymer resin emulsion. Examples of the acrylic ester polymer resin emulsion include KR-158 (manufactured by Koyo Sangyo Co., Ltd.), KR-159 (manufactured by Koyo Sangyo Co., Ltd.), and AP620 (manufactured by Japan Coating Resin Co., Ltd.). Furthermore, the thickness of the adhesion layer 12 is set in the range of 50 to 150 μm, preferably in the range of 80 to 100 μm. Here, the thickness of the adhesive layer 12 is limited to the range of 50 to 150 μm because the adhesive strength is reduced when the thickness is less than 50 μm, and when the thickness exceeds 150 μm, the surface of the coating layer of the adhesive layer 12 is covered in the drying process This is because the water inside the coating film becomes poor and bubbles are generated.

On the other hand, as the sheet-like base material layer 11, it is preferable to use a nonwoven fabric. Examples of the non-woven fabric include cellulose-based non-woven fabrics such as hemp, and non-woven fabrics made of thermoplastic resin-based fibers such as polyolefins and polyesters. Examples of the cellulose-based nonwoven fabric include Benize (manufactured by Asahi Kasei Corporation) and TCF (manufactured by Phutamura Chemical Co., Ltd.). As the polyolefin-based nonwoven fabric, Elves (manufactured by Unitika Ltd.) is exemplified. Examples of the polyester-based nonwoven fabric include Milife (manufactured by JX Nippon Mining & Chemicals Corporation) and Ertas (manufactured by Asahi Kasei Corporation). Moreover, it is preferable that the basic weight of a nonwoven fabric exists in the range of 20-70 g / m < ² >. Here, with limited basis weight of the nonwoven fabric in the range of 20 to 70 g / m ^2, in less than 20 g / m ² is difficult coating of the adhesion layer composition, greater than 70 g / m ² If the basic weight This is because when a sheet prepared using a large non-woven fabric is applied to the first floor finish 21 and peeled off, the non-woven fabric is torn and a defect that cannot be removed again occurs.

  As another embodiment of the present invention, as shown in FIG. 2, the floor releasable adhesive sheet 10 has an adhesive layer 12 formed on the back side of the sheet-like base material layer 11, An adhesive layer 13 may be formed on the surface side. The adhesive layer is composed of an emulsion-type adhesive or a solvent-type adhesive. Examples of the emulsion type pressure-sensitive adhesive include acrylate polymer resin emulsion KR-159 (manufactured by Koyo Sangyo Co., Ltd.) and BPW6111 (manufactured by Toyo Ink Co., Ltd.). Examples of the solvent-type adhesive include SK Dyne series SK1717 and SK1760 (manufactured by Soken Chemical Co., Ltd.). The composition used for this pressure-sensitive adhesive layer is a hard composition of strong adhesion type. This is because if the composition is relatively weak and soft as used in the adhesion layer, the adhesion with the second floor finish is inferior, and the second floor finish may peel off after construction. Because there is.

  A floor finishing construction method using the floor releasable adhesive sheet 10 thus configured will be described with reference to FIGS. In the floor releasable adhesive sheet 10, a protective sheet 14 is laminated on the surface of the adhesive layer 12 in order to protect the surface of the adhesive layer 12 and the surface of the adhesive layer 13 before use (FIG. 1). And FIG. 2). First, the sheet-like base material layer 11 of the floor releasable adhesive sheet 10 is bonded to the entire back surface of the second floor finish 22 (for example, a tile carpet having a width of about 450 mm and a length of about 450 mm) at a factory or the like. Keep it integrated. As a method of bonding the second floor finish 22 and the sheet-like base material layer 11 of the floor releasable sheet 10, the double-sided pressure-sensitive adhesive tape or the adhesive layer 15 may be used, or floor re-peeling An adhesive layer 13 may be formed in advance on the surface side of the sheet-like base material layer 11 of the mold contact sheet 10 (FIG. 2) and bonded to the second floor finish 22. Next, in the construction site, the protective sheet 14 on the adhesion layer 12 side of the floor releasable adhesion sheet 10 is peeled off, and the adhesion layer 12 is applied to the surface of the first floor finish 21 provided on the surface of the floor surface 16. Secure to touch. If the second floor finishing material 22 and the floor releasable adhesive sheet 10 are integrated in advance as described above, it is easy to perform position adjustment at the time of flooring construction and removability at the time of flooring renewal. .

  In addition, as floor finishing construction methods other than the above, the following floor finishing construction methods are mentioned. First, the protective sheet 14 on the adhesion layer 12 side of the floor releasable adhesion sheet 10 is peeled off, and the exposed adhesion layer 12 is fixed so as to contact the surface of the first floor finish 21. Next, the back surface side of the second floor finish 22 is fixed to the surface side of the sheet-like base material layer 11 of the floor releasable adhesive sheet 10. In this case, a method of applying an adhesive to the surface side of the sheet-like base material layer 11 or the back side of the second floor finishing material 22 of the floor releasable adhesive sheet 10 and fixing the second floor finishing material 22 with the adhesive. Alternatively, a double-sided pressure-sensitive adhesive tape 15 or the like is attached between the surface side of the sheet-like base material layer 11 of the floor releasable adhesive sheet 10 and the back side of the second floor finish 22, There is a method of fixing the floor finishing material 22.

  Next, examples of the present invention will be described in detail together with comparative examples.

<Examples 1-3>
First, as a constituent component of the adhesion layer, natural rubber latex (solid content 60% by mass, product name: ULACOL, manufactured by Regex Corp.) and acrylic resin emulsion (product name: KR-) having a glass transition temperature of −40 ° C. 159, manufactured by Koyo Sangyo Co., Ltd.). Next, the above two components were blended in a ratio of 100: 5 (Example 1), 100: 10 (Example 2) and 100: 30 (Example 3) on a mass basis, and 2% by mass. 3 parts by mass of a cellulose aqueous dispersion (trade name: IMa-120002, manufactured by Sugino Machine Co., Ltd.) in which 98% by mass of cellulose nanofibers are dispersed in 100 parts by mass of natural rubber latex, and stirred. Then, three types of adhesion layer compositions were prepared. Next, as shown in FIG. 1, the adhesive layer composition is applied to the back side of the sheet-like base material layer 11 (polyester nonwoven fabric, product name: Milife, manufactured by JX Nippon Mining & Chemicals, Inc.), The adhesive layer 12 having a thickness of 90 μm was formed on the back surface side of the sheet-like base material layer 11 by being held and dried at a temperature of 80 ° C. for 5 to 6 minutes in a drying furnace. Furthermore, by attaching a protective sheet 14 to the surface of the adhesive layer 12 formed on the back side of the sheet-like base material layer 11, and curing it for about one week to 10 days to obtain an equilibrium moisture content, three types of floor re-use A peelable adhesive sheet 10 was obtained. These floor re-peelable adhesive sheets 10 were designated as Examples 1 to 3.

<Examples 4 to 6>
Three types of floor releasable molds as in Examples 1 to 3, except that an acrylic resin emulsion (product name: KR-158, manufactured by Koyo Sangyo Co., Ltd.) having a glass transition temperature of −50 ° C. was used. An adhesive sheet was obtained. These floor re-peelable adhesive sheets were designated as Examples 4-6.

<Examples 7 to 9>
Three types of floors in the same manner as in Examples 1 to 3 except that an acrylic ester polymer resin emulsion having a glass transition temperature of −68 ° C. (product name: AP620, manufactured by Japan Coating Resin Co., Ltd.) was used. A re-peelable adhesion sheet was obtained. These floor re-peelable adhesive sheets were designated as Examples 7-9.

<Examples 10 and 11>
Example, except that 0.5 parts by mass and 10 parts by mass of a cellulose aqueous dispersion obtained by dispersing 2% by mass of cellulose nanofibers in 98% by mass of water are added to 100 parts by mass of natural rubber latex, respectively. In the same manner as in No. 5, two types of floor re-peelable adhesive sheets were obtained. These floor re-peelable adhesive sheets were designated as Examples 10 and 11.

<Comparative Example 1>
Example 1 except that 10 parts by mass of an acrylic resin emulsion having a glass transition temperature of −36 ° C. (product name: KR-7034, manufactured by Koyo Sangyo Co., Ltd.) is added to 100 parts by mass of natural rubber latex. Similarly, a floor releasable adhesive sheet was obtained. This floor releasable adhesive sheet was referred to as Comparative Example 1.

<Comparative example 2>
Except that 10 parts by mass of an acrylic resin emulsion having a glass transition temperature of −75 ° C. (product name: AP601, manufactured by Japan Coating Resin Co., Ltd.) is added to 100 parts by mass of natural rubber latex, the same as in Example 1. Thus, a floor re-peelable adhesive sheet was obtained. This floor releasable adhesive sheet was referred to as Comparative Example 2.

<Comparative Examples 3 and 4>
Except having added 3 mass parts or 35 mass parts of acrylic resin emulsion (product name: KR-158, Koyo Sangyo Co., Ltd.) whose glass transition temperature is -50 degreeC with respect to 100 mass parts of natural rubber latex, respectively. In the same manner as in Example 1, two types of re-peelable adhesive sheets for floors were obtained. These floor re-peelable adhesive sheets were referred to as Comparative Examples 3 and 4.

<Comparative Example 5>
Example 2 was used except that an ethylene-vinyl acetate copolymer resin emulsion (glass transition temperature: −30 ° C., product name: S408HQE, manufactured by Sumika Chemtex Co., Ltd.) was used instead of the acrylic resin emulsion. A floor re-peelable adhesive sheet was obtained. This floor releasable adhesive sheet was referred to as Comparative Example 5.

<Comparative Example 6>
Example 2 except that a styrene-butadiene copolymer resin emulsion (glass transition temperature: −27 ° C., product name: L-7850, manufactured by Asahi Kasei Chemicals Corporation) was used instead of the acrylic ester polymer resin emulsion. In the same manner as described above, a floor releasable adhesive sheet was obtained. This floor re-peelable adhesive sheet was referred to as Comparative Example 6.

<Comparative test 1 and evaluation>
For the floor re-peelable adhesive sheets of Examples 1 to 11 and Comparative Examples 1 to 6, changes in adhesive strength with time were evaluated. Specifically, first, as shown in FIG. 4A, test pieces 30 each having a width of 25 mm and a length of 200 mm were cut out from the floor releasable adhesive sheets of Examples 1 to 11 and Comparative Examples 1 to 6, respectively. These test pieces 30 were brought into close contact with an adherend (a substitute for the first floor finish) 41 made of plastic floor tiles by reciprocating 5 times with a 2 kg roller. Next, as shown in FIG. 4B, after being left for one week and six months in a 40 ° C. atmosphere, a peeling test in the 90 ° direction was performed. Here, the tensile speed in the peeling test was 300 mm / min. And when the adhesive force in a peeling test exists in the range of 1.0-5.0 N / mm < ² >, it was set as appropriate strength. Further, the presence or absence of adhesive residue (presence or absence of adhesion layer adhesion) on the adherend (substituent for the first floor finishing material) 41 was visually determined to evaluate the removability. The results are shown in Table 1. In Table 1, “CNF” is a cellulose aqueous dispersion in which 2% by mass of cellulose nanofibers are dispersed in 98% by mass of water, and “addition amount of CNF” is natural rubber of the cellulose aqueous dispersion. It is the addition amount (part by mass) with respect to 100 parts by mass of latex.

As apparent from Table 1, the floor re-peelable adhesive sheet of Comparative Example 1 using an acrylic resin emulsion (product name: KR-7034) whose glass transition temperature is too high, -36 ° C., was maintained at 40 ° C. for 1 week. The adhesive residue (adhesion layer adhesion) when the adhesive sheet was peeled again after being allowed to stand and after being allowed to stand at 40 ° C. for 6 months was “none”, but after being left at 40 ° C. for 1 week and at 6 ° C. The adhesive strength after being left for months was too weak at 0.5 N / mm ² and 0.6 N / mm ² , respectively, and the overall evaluation was poor. Moreover, in the re-peelable adhesive sheet for floors of Comparative Example 2 using an acrylic resin emulsion (product name: AP601) whose glass transition temperature is too low as −75 ° C., the glass transition temperature was left at 40 ° C. for 1 week and 6 ° C. at 40 ° C. Adhesive residue (adhesion layer adhesion) when the adhesive sheet was peeled again after standing for months was “slightly present” and “presence”, respectively, left at 40 ° C. for 1 week and then left at 40 ° C. for 6 months The subsequent adhesive strength was too strong at 5.3 N / mm ² and 8.6 N / mm ² , respectively, and the overall evaluation was poor. In contrast, acrylic resin emulsions (product names: KR-159, KR-158, AP620) having a glass transition temperature within the appropriate range (-70 ° C to -40 ° C) of -68 ° C to -40 ° C are used. In the re-peelable adhesive sheet for floors of Examples 1 to 11, the adhesive residue (adhesion layer adhesion) after leaving the adhesive sheet again after leaving at 40 ° C. for 1 week and after leaving at 40 ° C. for 6 months is is "no", and 40 ° C. adhesive strength and each 2.0~3.6N / mm ² in after standing 6 months and 40 ° C. after allowed to stand for 1 week 2.4~4.2N / mm ² It was appropriate strength and overall evaluation was excellent.

On the other hand, even when an acrylic resin emulsion (product name: KR-158, glass transition temperature: −50 ° C.) having a glass transition temperature within an appropriate range was used, the amount added was too small at 3 parts by mass. In the floor re-peelable adhesive sheet, the adhesive residue (adhesion layer adhesion) was “None” when the adhesive sheet was re-peeled after leaving at 40 ° C. for 1 week and after leaving at 40 ° C. for 6 months. But, 40 ℃ adhesive strength will each too weak and 0.2N / mm ² and 0.4N / mm ² in after standing for six months was left unattended and after and 40 ℃ 1 week, the overall evaluation is bad, respectively there were. Moreover, even if the acrylic resin emulsion (product name: KR-158, glass transition temperature: -50 degreeC) which has a glass transition temperature in an appropriate range is used, the addition amount was too much with 35 mass parts, and the comparative example 4 In the re-peelable adhesive sheet for flooring, the adhesive residue (adhesion layer adhesion) when the adhesive sheet was removed again after leaving at 40 ° C. for 1 week and after leaving at 40 ° C. for 6 months was “slightly”. and is "Yes", becomes too strong adhesive force with each 5.5N / mm ² and 7.8N / mm ² in after standing for 6 months and 40 ℃ after and allowed to stand for one week to 40 ℃, comprehensive Each evaluation was poor.

On the other hand, in the floor peelable adhesive sheet of Comparative Example 5 using an ethylene-vinyl acetate copolymer resin emulsion (product name: S408HQE) instead of an acrylic resin emulsion, after leaving at 40 ° C. for 1 week and at 40 ° C. The adhesive residue (adhesion layer adhesion) when the adhesive sheet was peeled again after standing for 6 months was “None”, and the adhesive strength after standing at 40 ° C. for 1 week was appropriate at 2.2 N / mm ² Although it was strong, the adhesive strength after being allowed to stand at 40 ° C. for 6 months became too strong at 9.2 N / mm ² , and the overall evaluation was poor. Further, in the floor peelable adhesive sheet of Comparative Example 6 using a styrene-butadiene copolymer resin emulsion (product name: L-7850) instead of an acrylic resin emulsion, the adhesive sheet was left after being left at 40 ° C. for 1 week. The adhesive residue (adhesion layer adhesion) when the film was peeled again was “no”, and the adhesive strength after standing at 40 ° C. for 1 week was 1.9 N / mm ^2. Adhesive residue (adhesion layer adhesion) when the adhesive sheet is peeled again after standing at 6 ° C. for 6 months is “Yes”, and the adhesive strength after standing at 40 ° C. for 6 months is as strong as 10.5 N / mm ² As a result, the overall evaluation was poor. On the other hand, in the re-peelable adhesive sheets for floors of Examples 1 to 11 using acrylic resin emulsion (product names: KR-159, KR-158, AP620) and after leaving at 40 ° C. for 1 week and at 40 ° C. The adhesive residue (adhesion layer adhesion) when the adhesive sheet is peeled again after being left for 6 months is “None”, and the adhesive strength after being left at 40 ° C. for 1 week and after being left at 40 ° C. for 6 months Are appropriate strengths of 2.0 to 3.6 N / mm ² and 2.4 to 4.2 N / mm ² , respectively, and the overall evaluation is excellent.

<Comparative Example 7>
A floor releasable adhesive sheet was obtained in the same manner as in Example 5 except that a cellulose aqueous dispersion in which 2% by mass of cellulose nanofibers were dispersed in 98% by mass of water was not added. This floor re-peelable adhesive sheet was referred to as Comparative Example 7.

<Comparative Examples 8 and 9>
Floor re-peeling type in the same manner as in Example 5 except that 0.5 parts by mass and 15 parts by mass of an aqueous cellulose dispersion obtained by dispersing 2% by mass of cellulose nanofibers in 98% by mass of water were added. An adhesive sheet was obtained. These re-peelable adhesive sheets for floors were designated as Comparative Examples 8 and 9.

<Comparative test 2 and evaluation>
Wax resistance was evaluated for the re-peelable adhesive sheets for floors of Example 5, Example 10, Example 11, and Comparative Examples 7-9. Specifically, first, as an adherend (substitute for the first floor finish), aqueous wax (product name: all (acrylic floor wax), manufactured by Linley Co., Ltd.) and oily urethane varnish (product name: Oily urethane floor varnish, manufactured by Campehapio Co., Ltd.) was applied, and two types of woody flooring were prepared by thoroughly drying. Next, test pieces each having a width of 25 mm and a length of 200 mm were cut out from the floor releasable adhesive sheets of Example 5, Example 10, Example 11, and Comparative Examples 7 to 9, and the lengths of these test pieces were 100 mm. The portion was brought into close contact with the adherend (substitute for the first floor finish) by reciprocating 5 times with a 2 kg roller. Furthermore, after leaving for 1 month in an atmosphere of 60 ° C., a peeling test in a 90 ° direction was performed. Here, the tensile speed in the peeling test was 300 mm / min. And when the adhesive force in a peeling test exists in the range of 1.0-5.0 N / mm < ² >, it was set as appropriate strength. In addition, the presence or absence of adhesive residue (presence or absence of adhesion layer adhesion) on the adherend (substitute for the first floor finishing material) was visually determined to evaluate the removability. The results are shown in Table 2. In Table 2, “CNF” is a cellulose aqueous dispersion in which 2% by mass of cellulose nanofibers are dispersed in 98% by mass of water, and “addition amount of CNF” is a natural rubber of the cellulose aqueous dispersion. It is the addition amount (part by mass) with respect to 100 parts by mass of latex. Moreover, in the column of “Presence / absence of adhesive residue” in Table 2, “Out of material” means a state in which a part of the test piece is peeled off and damaged.

As apparent from Table 2, the floor re-peelable adhesive sheet of Comparative Example 7 in which 2% by mass of cellulose nanofibers were dispersed in 98% by mass of water and no cellulose aqueous dispersion was added, When adhered to the coated substrate, the adhesive strength after leaving it at 60 ° C for one month is 4.7 N / mm ² and the adhesive strength (adhesion layer adhesion) is “None” However, when it was made to adhere to the adherend coated with oily urethane varnish, the adhesive strength after being left at 60 ° C. for 1 month became too strong, 10.5 N / mm ² , and the test piece was also The material was “out of material” and the overall evaluation was poor. In addition, for the floor of Comparative Example 8 in which the amount of cellulose aqueous dispersion obtained by dispersing 2% by mass of cellulose nanofibers in 98% by mass of water was too small as 0.5 parts by mass with respect to 100 parts by mass of natural rubber latex. In a re-peelable adhesive sheet, when it is adhered to an adherend coated with aqueous wax, the adhesive remains with an appropriate strength of 4.8 N / mm ² after standing at 60 ° C. for 1 month. (Adhesion of adhesion layer) was “None”, but when adhered to an adherend coated with oil-based urethane varnish, the adhesive strength after leaving at 60 ° C. for 1 month was 9.7 N / mm ² The test piece was also “out of material” and the overall evaluation was poor. Further, the floor re-peeling of Comparative Example 9 in which the cellulose aqueous dispersion obtained by dispersing 2% by mass of cellulose nanofibers in 98% by mass of water was too much as 15 parts by mass with respect to 100 parts by mass of natural rubber latex. In the mold adhesion sheet, both the adherent coated with water-based wax and the adherend coated with oil-based urethane varnish both left the adhesive sheet after being left at 60 ° C. for 1 month (adhesive layer) However, the adhesive strength was too weak at 0.5 N / mm ² and 0.6 N / mm ² , and the overall evaluation was poor. In contrast, the cellulose aqueous dispersion in which 2% by mass of cellulose nanofibers are dispersed in 98% by mass of water has an addition amount of 0.5 to 10 parts by mass with respect to 100 parts by mass of the natural rubber latex (in an appropriate range ( The addition amount of cellulose nanofiber to 100 parts by mass of natural rubber latex: 0.01 to 0.2 parts by mass) In the releasable adhesive sheets for floors of Examples 5, 10 and 11, coated with aqueous wax When adhered to the dressing, the adhesive strength after leaving at 60 ° C. for 1 month is 1.6-4.8 N / mm ^2, and the adhesive residue (adhesion layer adhesion) is all “None” Even when it is adhered to an adherend coated with an oil-based urethane varnish, the adhesive strength after leaving it at 60 ° C. for 1 month is 1.5 to 4.8 N / mm ^2. And all adhesive residue (adhesion layer adhesion) It was “no” and the overall evaluation was excellent.

<Examples 12 and 13>
Two types of re-peelable adhesive sheets for floors were obtained in the same manner as in Example 5 except that the thickness of the adhesive layer in Example 5 was 55 μm and 148 μm, respectively. These floor re-peelable adhesive sheets were designated as Examples 12 and 13.

<Comparative Examples 10 and 11>
Two types of re-peelable adhesive sheets for floors were obtained in the same manner as in Example 5 except that the thickness of the adhesive layer in Example 5 was 41 μm and 163 μm, respectively. These floor re-peelable adhesive sheets were referred to as Comparative Examples 10 and 11.

<Comparative test 3 and evaluation>
For the floor peelable adhesive sheets of Example 5, Example 12, Example 13, Comparative Example 10 and Comparative Example 11, the change with time of the adhesive force was evaluated in the same manner as in Comparative Test 1. And when the adhesive force in a peeling test exists in the range of 1.0-5.0 N / mm < ² >, it was set as appropriate strength. In addition, the presence or absence of adhesive residue (presence or absence of adhesion layer adhesion) on the adherend (substitute for the first floor finishing material) was visually determined to evaluate the removability. The results are shown in Table 3. In Table 3, “CNF” is a cellulose aqueous dispersion in which 2% by mass of cellulose nanofibers are dispersed in 98% by mass of water, and “addition amount of CNF” is a natural rubber of the cellulose aqueous dispersion. It is the addition amount (part by mass) with respect to 100 parts by mass of latex.

As is apparent from Table 3, in Examples 5, 12, and 13 in which the adhesion layer had a predetermined thickness (within an appropriate range of 50 to 150 μm), after being left at 40 ° C. for 1 week and at 40 ° C. for 6 months The adhesive strength after standing for a while was 1.1 to 3.6 N / mm ² , the adhesive residue (adhesion layer adhesion) was “none”, and the overall evaluation was excellent. On the other hand, in Comparative Example 10 in which the thickness of the adhesion layer was too thin at 41 μm, the adhesive strength after leaving at 40 ° C. for 1 week and after leaving at 40 ° C. for 6 months was too weak at 0.1 N / mm ² , The overall evaluation was poor. Further, in Comparative Example 11 in which the thickness of the adhesion layer was too thick at 163 μm, the adhesion layer could not be formed because bubbles were generated in the drying process and the surface was uneven.

  The re-peelable adhesive sheet for floors of the present invention has a second floor finishing material such as plastic floor tiles attached to the surface of the first floor finishing material provided on the surface of the floor surface of a concrete floor base material or the like. Available to do.

DESCRIPTION OF SYMBOLS 10 Removable adhesion sheet for floors 11 Sheet-like base material layer 12 Adhesion layer 16 Floor surface 21 First floor finishing material 22 Second floor finishing material

Claims (1)

Adhering to the back side of the sheet-like base material layer interposed between the first floor finishing material provided on the surface of the floor and the second floor finishing material provided on the surface side of the first floor finishing material In the floor re-peelable adhesive sheet in which a layer is formed,
The adhesion layer includes 5 to 30 parts by mass of an acrylic resin emulsion and 0.01 to 0.2 parts by mass of cellulose nanofibers with respect to 100 parts by mass of natural rubber latex.
The glass transition temperature of the acrylic resin emulsion is -70 ° C to -40 ° C,
A floor re-peelable adhesive sheet, wherein the adhesive layer has a thickness of 50 to 150 µm.

Images