JP2019024348A - Weed-proof sheet - Google Patents

Abstract

To provide a weed-proof sheet capable of suppressing growth of weed on a paved road.SOLUTION: In a weed-proof sheet 1 including a base material layer 10, and an adhesive layer 20 laminated on the base material layer 10, the base material layer 10 has a woven fabric 11 and a resin part 12 covering the woven fabric 11, and a thickness of the base material layer 10 is 0.3 mm or more and 0.8 mm or less, and a light transmittance of the weed-proof sheet 1 is below 0.3%, to thereby suppress growth of weed on a paved road, while maintaining flexibility of the sheet.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a weedproof sheet provided on a paved road.

  In places such as concrete or asphalt joints on paved roads, earth and sand may accumulate, and weeds may be generated on the accumulated earth and sand. Weeds have a strong growth potential, and especially weeds such as Chigaya, Horsetail or Hamasge also have strong penetrating power, which can destroy paved roads and even cause traffic accidents. Patent Document 1 discloses a weed prevention tape and a method of using this tape to inhibit weeds from growing on joints between pavement materials and other structures.

JP 2005-210906 A

  The weedproof sheet provided on the paved road is required to have a light shielding property that reduces the strong growth force of weeds and a penetration resistance that can withstand the strong penetration force of weeds. Furthermore, there are cases where there are slight gaps or steps in the seam or the like on the road, and it is necessary to have the flexibility to follow these and maintain the installation state. However, when the entire weedproof sheet is made thicker in order to increase penetration resistance, there is a problem that flexibility is likely to be lowered and a pedestrian trips due to a step at the end of the weedproof sheet.

  The weedproof sheet according to one aspect of the present invention includes a base material layer and an adhesive layer laminated on the base material layer, and the base material layer includes a woven fabric and a resin portion that covers the woven fabric. The thickness of the base material layer is 0.3 mm or more and 0.8 mm or less, and the light transmittance of the weedproof sheet is less than 0.3%.

  According to the weedproof sheet according to one aspect of the present invention, it is possible to suppress the growth of weeds on a paved road while maintaining the flexibility of the sheet. Since the light transmittance of the herbicidal sheet is less than 0.3%, the herbicidal sheet has a light-shielding property that reduces the strong growth force of weeds. Moreover, since a base material layer has a woven fabric and the resin part which covers a woven fabric, a weedproof sheet has penetration resistance which can endure the strong penetration force of weeds. Since the thickness of the base material layer is 0.3 mm or more, the herbicidal sheet has penetration resistance that can withstand the strong penetrating force of weeds, and the thickness of the base material layer is 0.8 mm or less. A sheet | seat is equipped with the softness | flexibility which can follow the level | step difference of a paved road. Moreover, since it has an adhesive layer, it can be easily constructed on a paved road or the like having a level difference, and a state of following the level difference can be maintained.

  A weedproof sheet that can suppress the growth of weeds on a paved road can be provided.

FIG. 1 is a cross-sectional view of the weedproof sheet according to the first embodiment. FIG. 2 is a plan view of the woven fabric according to the first embodiment. FIG. 3 is a cross-sectional view of the weedproof sheet according to the second embodiment.

  The herbicidal sheet according to the embodiment includes a base material layer and an adhesive layer laminated on the base material layer. The base material layer includes a woven fabric and a resin portion that covers the woven fabric. The thickness of the layer is 0.3 mm or more and 0.8 mm or less, and the light transmittance of the herbicidal sheet is less than 0.3%.

  The weedproof sheet according to the above embodiment can suppress the growth of weeds on a paved road while maintaining the flexibility of the sheet. Since the light transmittance of the herbicidal sheet is less than 0.3%, the herbicidal sheet has a light-shielding property that reduces the strong growth force of weeds. Moreover, since a base material layer has a woven fabric and the resin part which covers a woven fabric, a weedproof sheet has penetration resistance which can endure the strong penetration force of weeds. Since the thickness of the base material layer is 0.3 mm or more, the herbicidal sheet has penetration resistance that can withstand the strong penetrating force of weeds, and the thickness of the base material layer is 0.8 mm or less. A sheet | seat is equipped with the softness | flexibility which can follow the level | step difference of a paved road. Moreover, since it has an adhesive layer, it can be easily constructed on a paved road or the like having a level difference, and a state of following the level difference can be maintained.

  In the weedproof sheet according to another aspect, the thickness of the woven fabric may be 0.15 mm or more and 0.5 mm or less.

  In the weedproof sheet according to another aspect, the number of fibers contained in the woven fabric may be 20 or more and 80 or less per 25 mm.

  In the herbicidal sheet according to another aspect, the woven fabric may include one or more fibers selected from the group consisting of nylon fibers, vinylon fibers, cotton, hemp, polypropylene fibers, polyester fibers, and polyethylene fibers.

  In the herbicidal sheet according to another aspect, the resin portion may include a vinyl chloride resin or a polyolefin resin.

  In the weedproof sheet according to another aspect, the thickness of the adhesive layer may be 0.2 mm or more and 1.5 mm or less.

  In the herbicidal sheet according to another aspect, the pressure-sensitive adhesive layer may contain a photocurable acrylic resin.

  In the herbicidal sheet according to another aspect, the adhesive layer may further include a nonwoven fabric covered with the adhesive layer.

  In the herbicidal sheet according to another aspect, the nonwoven fabric may include spunbond fibers.

In the above embodiment, “woven fabric” means a fabric made by weaving fibers. “Nonwoven fabric” means a cloth made by entanglement of fibers with heat or an adhesive without weaving the fibers. The “adhesive layer” is a layer made of an adhesive substance, and specifically, the storage elastic modulus (G ′) measured at 10 radians / second at room temperature (20 ° C.) is less than 3 × 10 ⁵ Pascals. It is a substance having viscoelasticity mainly composed of a certain polymer.

  Hereinafter, embodiments of the weedproof sheet will be described in detail with reference to the drawings. In this description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

(First embodiment)
FIG. 1 is a cross-sectional view of the weedproof sheet according to the first embodiment. 2A is a plan view of the woven fabric according to the first embodiment, and FIG. 2B is a cross-sectional view taken along line IIb-IIb in FIG. 2A. It is. In FIG.1 and FIG.2 (b) figure, the cross section of the fiber is circularly shown for convenience. In this embodiment, the X-axis, Y-axis, and Z-axis are set with respect to FIGS. 1 and 2, but these axes are set for convenience of explanation, The Z axis is set in the stacking direction. The X axis is set in the vertical direction MD, and the Y axis is set in the horizontal direction CD. A longitudinal direction MD (Machine Direction) indicates a direction in which the weedproof sheet is wound, and a lateral direction CD (CrossMachine Direction) indicates a direction perpendicular to the longitudinal direction.

  As shown in FIG. 1, the herbicidal sheet 1 includes a base material layer 10 and an adhesive layer 20 laminated on the base material layer 10. The base material layer 10 includes a woven fabric 11 and a resin portion 12 that covers the woven fabric 11. The woven fabric 11 can be surrounded by the resin portion 12.

  The weave of the woven fabric 11 is, for example, a plain weave. FIG. 2 shows a woven fabric 11 by plain weaving. Fibers for plain weaving are composed of warp WA and weft WO, and warp WA and weft WO are alternately woven to produce woven fabric 11. The thickness D1 of the fibers (warp yarn WA, weft WO) included in the woven fabric 11 is, for example, 0.075 mm or more and 0.25 mm or less. In the woven fabric 11 by plain weaving, the warp WA and the weft WO are alternately overlapped. Therefore, the thickness D2 of the woven fabric 11 is twice the thickness of the fiber (warp WA, weft WO), for example, 0.15 mm or more and 0 .5 mm or less.

  When the thickness D2 of the woven fabric 11 is less than 0.15 mm, the mechanical strength of the woven fabric 11 is lowered, and the penetration resistance necessary for preventing grass is lowered. On the other hand, when the thickness D2 of the woven fabric 11 is larger than 0.5 mm, for example, the base material layer 10 may be broken when the weedproof sheet 1 is rolled. When the base material layer 10 is folded, it becomes difficult to roll the herbicidal sheet 1, and the folds of the base material layer 10 are transferred to the pressure-sensitive adhesive layer 20, causing problems such as uneven thickness in the pressure-sensitive adhesive layer 20. . Moreover, while the penetration resistance required for weed prevention is obtained, while the softness | flexibility of the base material layer 10 for affixing a weedproof sheet to a level | step difference etc. reduces, it is because of the repulsive stress over a long period of time after affixing Peeling may occur on the weedproof sheet. The thickness D2 of the woven fabric 11 may be 0.2 mm or more and 0.4 mm or less.

  In the woven fabric 11, for example, the number of fibers per 25 mm is 20 or more and 80 or less. When the number of fibers per 25 mm is less than 20, the woven fabric 11 has a low woven density and lowers the penetration resistance necessary for weed protection. On the other hand, when the number of fibers per 25 mm is larger than 80, for example, the penetration resistance necessary for weed prevention can be obtained, while the flexibility of the base material layer 10 for attaching the weed prevention sheet to a step or the like Decrease. The number of fibers per 25 mm may be 30 or more and 50 or less.

  The woven fabric 11 can include synthetic fibers, natural fibers, or a combination of synthetic and natural fibers. The synthetic fiber contained in the woven fabric 11 is, for example, a fiber excellent in durability, specifically, a nylon fiber, a vinylon fiber, a polypropylene fiber, a polyester fiber, or an ultrahigh molecular weight polyethylene fiber. The synthetic fiber contained in the woven fabric 11 is particularly preferably a polyester fiber. The natural fiber contained in the woven fabric 11 contains cotton or hemp, for example.

  The resin part 12 of the base material layer 10 contains a resin, and this resin is, for example, a plasticized vinyl chloride resin or a polyolefin resin. The base material layer 10 is produced by, for example, an impregnation method. In the impregnation method, the woven fabric 11 is coated by impregnating the woven fabric 11 with a resin paste such as a vinyl chloride resin paste. For example, the vinyl chloride resin paste is specifically produced by the following procedure. That is, a vinyl chloride resin (100 parts by weight) and a plasticizer (40 to 70 parts by weight) such as dioctyl phthalate (DOP) or diisononyl phthalate (DINP) are mixed to prepare a resin mixture. . Subsequently, if necessary, the resin mixture is diluted with an organic solvent to prepare an organosol. For example, a modifier such as epoxidized soybean oil, a stabilizer such as zinc stearate, and a filler such as silica and calcium carbonate are added to these sols. The resin mixture further contains an inorganic pigment and / or an organic pigment for reducing light transmittance. The inorganic pigment includes, for example, carbon black or titanium oxide, and the organic pigment includes, for example, a diazo type or a phthalocyanine type.

  In the impregnation method, after the woven fabric 11 is sufficiently impregnated with the vinyl chloride resin paste, the vinyl chloride resin paste is solidified by, for example, a method called a sol-gel method. Specifically, the diluted solvent is evaporated and dried from the impregnated vinyl chloride resin paste, and the evaporated and dried vinyl chloride resin paste is solidified by heating to 180 ° C. for several minutes, for example. The base material layer 10 is produced by solidifying the vinyl chloride resin paste. In the impregnation method, the vinyl chloride resin paste sufficiently penetrates into the woven fabric 11, so that the durability of the base material layer 10 and the adhesion between the woven fabric 11 and the resin are excellent. In addition, the base material layer 10 can be produced by, for example, a laminating method in addition to the impregnation method. In the laminating method, a resin such as plasticized vinyl chloride resin is laminated on both surfaces of the woven fabric 11 to cover the woven fabric 11. When using the laminating method, the resin covering the woven fabric 11 does not need to be the same, and different resins may be laminated on both sides of the woven fabric 11.

  The thickness DB of the base material layer 10 is 0.3 mm or more and 0.8 mm or less. When the thickness DB of the base material layer 10 is less than 0.3 mm, the penetration resistance that can withstand the strong penetration force of weeds decreases. On the other hand, when the thickness DB of the base material layer 10 is larger than 0.8 mm, the adhesive strength of the base material layer is increased, while the flexibility of the base material layer 10 for attaching the herbicidal sheet to a step or the like. Is reduced. In addition, 0.4 mm or more and 0.7 mm or less may be sufficient as thickness DB of the base material layer 10. FIG.

  The herbicidal sheet 1 includes an adhesive layer 20. Thereby, the affixing construction to a paved road etc. can be simplified. The pressure-sensitive adhesive layer 20 can include, for example, a photocurable acrylic resin that is cured by ultraviolet rays, specifically, an acrylic pressure-sensitive adhesive. The acrylic polymer contained in the acrylic pressure-sensitive adhesive includes, for example, a first monomer composed of at least one (meth) acrylic acid ester of a non-tertiary alcohol having an alkyl group having 4 to 20 carbon atoms, It may be a polymer obtained by polymerizing a second monomer that is copolymerized with the first monomer. However, the second monomer is a monomer different from the first monomer. Examples of first monomers include n-butyl acrylate, n-hexyl acrylate, n-octyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate, n-decyl acrylate, n-dodecyl acrylate, octadecyl acrylate and These mixtures are mentioned.

  The second monomer may be a monomer having at least one ethylenically unsaturated group and giving a polymer having a glass transition temperature exceeding 0 ° C. when homopolymerized. Examples of the second monomer include (meth) acrylic acid, N-vinyl pyrrolidone, N-vinyl caprolactam, substituted (meth) acrylamide such as N, N-dimethylacrylamide, acrylonitrile, isobornyl acrylate, alkyl group carbon Examples include acrylates of alcohols having a number of 1 to 3, carboxyethyl acrylate, and mixtures thereof.

  Regarding the mass ratio of the first monomer to the second monomer (first monomer / second monomer), the first monomer is 70 parts by mass or more, or 80 parts by mass or more, and the second monomer is 2 parts by mass. It is preferable that the amount is 5 parts by mass or more, 30 parts by mass or less, or 20 parts by mass or less. In addition to the above substances, the pressure-sensitive adhesive layer 20 may contain bubbles by foaming a rosin ester-based tackifying resin, an inorganic filler such as silica, and a pressure-sensitive adhesive. In addition to the acrylic pressure-sensitive adhesive, examples of useful pressure-sensitive adhesives include known pressure-sensitive adhesives such as synthetic rubbers and silicones mainly composed of styrene synthetic rubber.

  In order to improve the adhesion between the pressure-sensitive adhesive layer 20 and the base material layer 10, the pressure-sensitive adhesive layer 20 is produced, for example, by a method such as an ultraviolet polymerization method on the base material layer 10 containing a vinyl chloride resin. Although oxygen gas is known to inhibit radical polymerization of acrylic monomers, the oxygen permeability of vinyl chloride resin is sufficiently low. Since the vinyl chloride resin has a sufficiently low oxygen permeability, the pressure-sensitive adhesive layer 20 containing an acrylic adhesive is produced on the base material layer 10 containing the vinyl chloride resin by an ultraviolet polymerization method. It is known that the plasticizer contained in the plasticized vinyl chloride resin moves to the adhesive and plasticizes the adhesive to impair the adhesiveness, but the acrylic adhesive containing the acrylic acid of the embodiment of the present invention is known. The layer has sufficient thermal stability to the plasticized vinyl chloride resin.

  The thickness DA of the adhesive layer 20 is, for example, not less than 0.1 mm and not more than 1.5 mm. More preferably, it is 0.2 mm or more and 1.5 mm or less. When the thickness DA of the pressure-sensitive adhesive layer 20 is less than 0.1 mm, the pressure-sensitive adhesive strength of the pressure-sensitive adhesive layer 20 becomes low, and the pressure-sensitive adhesive force of the weedproof sheet 1 on a large uneven surface such as a paved road becomes weak. If the thickness DA of the adhesive layer 20 is 0.2 mm or more, a sufficiently high adhesive strength can be obtained practically. On the other hand, when the thickness DA of the pressure-sensitive adhesive layer 20 is larger than 1.5 mm, the pressure-sensitive adhesive strength of the pressure-sensitive adhesive layer 20 is increased, while the thickness of the entire herbicidal sheet increases, and a pedestrian stumbles on the grass-proof sheet 1. A problem occurs. Further, when the herbicidal sheet 1 is rolled, the sheet is folded and wrinkles are generated, resulting in problems such as uneven thickness in the adhesive layer 20. The thickness DA of the adhesive layer 20 may be not less than 0.5 mm and not more than 1.0 mm.

  In this embodiment, since the thickness of the base material layer 10 is 0.3 mm or more, the weedproof sheet 1 has penetration resistance that can withstand the strong penetration force of weeds, and the thickness of the base material layer 10 is 0.00. Since it is 8 mm or less, the weed prevention sheet 1 is provided with the flexibility which can follow the level | step difference of a paved road. Moreover, since it has the adhesion layer 20, while being able to construct easily on a paved road with a level | step difference, etc., the follow-up state to a level | step difference can be maintained and the position shift of a weedproof sheet can be prevented.

  Moreover, since the weed prevention sheet 1 is provided with the resin part 12 which covers the woven fabric 11, it has the waterproofness which can endure the installation on a paved road. This waterproof property prevents water from penetrating the interface between the pressure-sensitive adhesive layer 20 and the base material layer 10 and maintains the adhesion and adhesive force between the pressure-sensitive adhesive layer 20 and the base material layer 10.

  In the herbicidal sheet 1 according to the present embodiment, the base material layer 10 includes a pigment, and has a light shielding property that reduces the transmittance of light such as visible light by the pigment and reduces the strong growth force of weeds. The illuminance required for the growth of weeds varies depending on the type of weed, but many weeds require illuminance in the range of 100 lux to 1000 lux. Since the illuminance of sunlight in sunny weather is about 100,000 lux (100,000 lux), the light transmittance of the weed control sheet 1 for preventing the growth of weeds is less than 1% (corresponding to the illuminance of less than 1000 lux) ), Preferably less than 0.3%, more preferably less than 0.1% (corresponding to an illuminance of less than 100 lux). When the light transmittance of the weed control sheet 1 is 1% or less, the growth of some weeds can be reduced. When the light transmittance of the weed control sheet 1 is less than 0.3%, the growth of many weeds can be reduced. When the light transmittance of the weedproof sheet 1 is less than 0.1%, the growth of most weeds can be reduced.

  In the present embodiment, for example, the light transmittance of the herbicidal sheet 1 is adjusted by changing the concentration of the inorganic pigment and / or the organic pigment contained in the base material layer 10. In this embodiment, since the light transmittance of the herbicidal sheet 1 is less than 0.3%, the herbicidal sheet 1 has a light-shielding property that reduces the strong growth force of many weeds. When the light transmittance of the herbicidal sheet 1 is less than 1% by changing the concentration of the inorganic pigment and / or the organic pigment, the herbicidal sheet 1 has a light-shielding property that reduces the strong growth force of some weeds. . When the light transmittance of the herbicidal sheet 1 is less than 0.1%, the herbicidal sheet 1 has a light-shielding property that reduces the strong growth force of most weeds.

  Since the base material layer 10 has the woven fabric 11 and the resin which covers this woven fabric 11, the weedproof sheet 1 has the penetration resistance which can endure the strong penetration force of weeds. The penetration resistance of the weedproof sheet 1 can be 360 N (Newton) or more. When the penetration resistance of the weedproof sheet is 360 N or more, weed growth on the paved road can be strongly suppressed. More preferably, the penetration resistance of the weedproof sheet 1 is 600 Newtons or more. When the penetration resistance of the weedproof sheet is 600 Newtons or more, the growth of strong grass such as chigaya can be more firmly suppressed, and damage to the weedproof sheet due to the passage of the vehicle can be prevented. The penetration resistance can be measured by the method described in ASTM D 4833.

  The weedproof sheet 1 has a flexibility that can be applied to a step of a paved road. The flexibility of the weedproof sheet 1 can be defined by the bending resistance of the weedproof sheet, and the bending resistance can be 150 mm or less. When the bending resistance of the herbicidal sheet 1 is 150 mm or less, the herbicidal sheet can be easily applied to a step or the like seen on a paved road, and the sheet can be firmly attached. The bending resistance of the weedproof sheet 1 may be 100 mm or less. When the bending resistance of the weedproof sheet 1 is 100 mm or less, the weedproof sheet can be more firmly attached to a complicated step or the like seen on a paved road. The bending resistance can be measured by Method A (45-degree cantilever method) described in JIS L 1096 (2010) 8.21.1. When the central point of one end of the weedproof sheet that is the test piece is in contact with the 45 ° slope, the moving length of the other end of the test piece is measured, and the moving length is the bending resistance of the weedproof sheet. Defined.

(Second Embodiment)
FIG. 3 is a cross-sectional view of the weedproof sheet 1P according to the second embodiment. The X axis, the Y axis, and the Z axis provided in FIG. 3 are set for convenience of explanation of the present embodiment. Note that the weedproof sheet 1P according to the second embodiment and the weedproof sheet 1 according to the first embodiment have the same elements and structures, and the following description will focus on the differences and the same. These elements and structures are denoted by the same reference numerals and detailed description thereof is omitted.

  As shown in FIG. 3, the herbicidal sheet 1 </ b> P includes a base material layer 10 and an adhesive layer 20 </ b> P laminated on the base material layer 10. The base material layer 10 includes a woven fabric 11 and a resin portion 12 that covers the woven fabric 11. In the herbicidal sheet 1 </ b> P, the adhesive layer 20 </ b> P includes a nonwoven fabric 21 and an adhesive resin portion 22 that covers the nonwoven fabric 21. While the nonwoven fabric 21 has a sheet-like shape, the arrangement direction of the fibers contained in the nonwoven fabric in the sheet is irregular. The non-woven fabric 21 can be surrounded by an adhesive resin portion 22 around it.

  The pressure-sensitive adhesive layer 20P can contain a pressure-sensitive adhesive, and the pressure-sensitive adhesive is, for example, an acrylic pressure-sensitive adhesive or a foam-like acrylic pressure-sensitive adhesive containing bubbles. In order to improve the adhesion between the pressure-sensitive adhesive layer 20P and the base material layer 10, the pressure-sensitive adhesive layer 20P is, for example, impregnated with a non-woven fabric 21 with the pressure-sensitive adhesive resin portion 22 and then ultraviolet rays on the base material layer 10 containing a vinyl chloride resin. It may be manufactured by a method such as a polymerization method, or may be manufactured by laminating the base material layer 10 after preparing the adhesive layer 20P.

  The nonwoven fabric 21 preferably has many voids and is tough. If the gap is small, the non-woven fabric 21 may not be sufficiently impregnated with the pressure-sensitive adhesive, resulting in bubble defects, or the adhesion between the non-woven fabric 21 and the pressure-sensitive adhesive layer 20P may be reduced. If the strength of the nonwoven fabric 21 is low, the integrity with the pressure-sensitive adhesive layer 20P cannot be maintained, and as a result, the adhesion with the base material layer 10 is not improved. In order to satisfy both the number of voids and the toughness of the nonwoven fabric 21, the nonwoven fabric 21 containing spunbond fibers produced by a spunbond method formed while melting and discharging a thermoplastic polymer into a continuous long fiber shape is preferable. . Moreover, it is preferable that the basic weight of the nonwoven fabric 21 is 8 g / square meter or more and 30 g / square meter or less, for example. Moreover, the thickness of the nonwoven fabric 21 is 0.03 mm or more and 0.1 mm or less, for example, when measured with a thickness gauge having a diameter of 10 mm. When the basis weight of the nonwoven fabric 21 is less than 8 g / square meter, the strength of the nonwoven fabric 21 is low and the cohesive force of the resin in the adhesive layer 20P does not increase. The part becomes easy to peel off. On the other hand, when the basis weight of the nonwoven fabric 21 is larger than 30 g / sq.m., The adhesive layer 20P does not sufficiently impregnate the nonwoven fabric 21 and entraps bubbles, so that the adhesion between the nonwoven fabric 21 and the adhesive layer 20P is low. It tends to be insufficient.

  The nonwoven fabric 21 is made of a thermoplastic synthetic resin, and is, for example, a polyamide resin, a polyester resin, or a polypropylene resin.

Hereinafter, the herbicidal sheet will be further described with reference to Examples and Comparative Examples of the present invention. The present invention is not limited to the following examples. In addition, the abbreviation of the material used by the Example and the comparative example, the compound name (brand name), and the acquisition place are as follows.
<Base material sheet>
2EHA: 2-ethylhexyl acrylate (Nippon Shokubai Co., Ltd.)
AA: Acrylic acid (Nippon Shokubai Co., Ltd.)
Irgacure 651: 2,2-dimethoxy-1,2-diphenylethane-1-one (BASF)
HDDA: Hexanediol diacrylate (Shin Nakamura Chemical Co., Ltd.)

Moreover, the abbreviation of the material contained in the base material layer or adhesion layer used by the Example and the comparative example, a brand name, and the acquisition place are as follows.
E65-EC: Craftel (registered trademark) canvas (Kuraray Plastics Co., Ltd.)
E5-EC: Craftel (registered trademark) canvas (Kuraray Plastics Co., Ltd.)
E4-EC: Craftel (registered trademark) canvas (Kuraray Plastics Co., Ltd.)
E2: Craftel (registered trademark) canvas (Kuraray Plastics Co., Ltd.)
KE-350: Cluster (registered trademark) Color Series (Kuraray Plastics Co., Ltd.)
Commercial sheet 1: Uemura vinyl sheet 300 (Uemura Sangyo Co., Ltd.)
Commercial sheet 2: Zaburn (registered trademark) weedproof sheet 240BB (DuPont)
Commercial sheet 3: High Milan (registered trademark) resin film (Mitsui DuPont Polychemical Co., Ltd.)
Nonwoven: Cerex® spunbond fabric 0.3 Oz (Cerex Advanced Fabrics Inc.)
Adhesive: 3M (registered trademark) primer EC-1368NT (3M Japan)

Example 1
In Example 1, a herbicidal sheet was prepared according to the following procedure. That is, first, a mixture was prepared in which a transparent glass container was filled with 2EHA (94 parts by weight), AA (6 parts by weight), and Irgacure 651 (0.04 parts by weight) of a photoinitiator. The mixture was purged with nitrogen to replace dissolved oxygen with nitrogen gas. After substitution with nitrogen gas, the mixture was irradiated with UV light from a UV-A lamp from the outside of the glass container, and the mixture was UV polymerized until the viscosity of the mixture partially reached about 1000 (cP). After irradiation with ultraviolet light, Irgacure 651 (0.1 part by weight) and HDDA (0.08 part by weight) were added to the mixture to prepare a pressure-sensitive adhesive composition.

E65-EC was prepared as a substrate layer, and the adhesive composition was knife coated on the E65-EC. E65-EC is a sheet obtained by coating a woven fabric made of polyester fiber with a plastic vinyl chloride resin, and is produced by an impregnation method in which a polyester fiber is impregnated with a vinyl chloride sol. A silicone-treated polyester film was placed on the pressure-sensitive adhesive composition provided on E65-EC to cover the pressure-sensitive adhesive composition. The thickness of the silicone-treated polyester film was 0.05 mm, and the pressure-sensitive adhesive composition was subjected to ultraviolet polymerization by irradiating the pressure-sensitive adhesive composition with ultraviolet rays from a UV-A lamp. After UV polymerization of the pressure-sensitive adhesive composition, the pressure-sensitive adhesive layer was adhered to the base material layer, and a herbicidal sheet comprising the pressure-sensitive adhesive layer and the base material layer was produced. The intensity of the irradiated ultraviolet light was 0.5 mW / cm ² and the total energy was 1000 mJ / cm ² .

  In Example 1, a characteristic test on a herbicidal sheet, specifically, a light transmittance measurement test, a bending resistance test, a penetration resistance test, a 90-degree peel adhesion test (before aging), and a 90-degree peel An adhesion test (after aging) and a flammability test were performed. The light transmittance measurement test, the bending resistance test, and the penetration resistance test were performed on a herbicidal sheet from which the silicone-treated polyester film on the adhesive layer was removed.

(Light transmittance measurement test)
The light transmittance measurement test was performed using a color illuminometer CL-200A (manufactured by Konica Minolta). The light transmittance of the weedproof sheet is the illuminance LX1 of sunlight received by the light sensor unit when the light sensor part of the color illuminance meter is covered with the weedproof sheet, and the light sensor part of the color illuminance meter with the weedproof sheet. It was calculated by comparison with the illuminance LX2 of sunlight received by the optical sensor unit when not covered. Specifically, the light transmittance (T) is obtained from Expression (1) obtained by dividing the illuminance LX1 by the illuminance LX2.
T = (LX1 / LX2) × 100 (%) (1)

(Measurement of bending resistance)
The bending resistance was measured by the method A (45-degree cantilever method) described in JIS L 1096 (2010) 8.21.1. When the central point of one end of the weedproof sheet that is the test piece is in contact with the 45 ° slope, the moving length of the other end of the test piece is measured, and the moving length (mm) is determined as the stiffness of the weedproof sheet. It was.

(Penetration resistance test)
The penetration resistance test was performed according to the method described in ASTM D 4833. After fixing the weedproof sheet with two test holding plates, it was pressurized with a steel rod at a speed of 300 mm per minute. The end of the steel rod has a flat shape, and the diameter of the steel rod is 8 mm. The maximum load applied when pressurized with a steel rod was estimated as the penetration resistance force.

(90 degree peel adhesion test: before aging)
In the 90 degree peel adhesion test (before aging), the herbicidal sheet was cut so as to have a width of 25 mm and a length of 200 mm. The silicone-treated polyester film on the adhesive layer is peeled off, and the herbicidal sheet is attached so that air is not caught in the standard building concrete block specified in JIS A 5406-2010, and then reciprocated with a 2 kg weight roller. Crimped. After curing for 20 minutes, the peel adhesion of the weedproof sheet was measured by pulling the weedproof sheet in a direction perpendicular to the concrete block surface (angle 90 degrees) at a speed of 300 mm / min.

(90-degree peel adhesion test: after aging)
In the 90-degree peel adhesion test (after aging), the herbicidal sheet was kept in an oven at 90 ° C. for 3 days, and then cut to a width of 25 mm and a length of 200 mm. Thereafter, the peel adhesive strength of the herbicidal sheet was measured by the same procedure as the 90-degree peel adhesive strength test (before aging).

(Flammability test)
The flammability test of the weedproof sheet was performed according to JIS L 1091 B method. The silicone-treated polyester film on the adhesive layer was peeled off to fix the weedproof sheet to the incombustible board, and the flame of the air mix burner was applied to the weedproof sheet for 30 seconds. The fire spread distance (cm) and the after flame time (second) were measured.

(Example 2)
In Example 2, a herbicidal sheet was produced by the same procedure as in Example 1 except that KE350 was used for the base material layer. KE350 is a vinyl chloride sheet containing a woven fabric, and is produced by laminating a plasticized vinyl chloride resin film on both sides of the woven fabric. In Example 2, the characteristics test of the herbicidal sheet was performed by the same apparatus and procedure as in Example 1.

(Example 3)
In Example 3, a herbicidal sheet was produced by the same procedure as in Example 1 except that the thickness of the adhesive layer was changed to 0.2 mm. In Example 3, the characteristic test of the herbicidal sheet was performed by the same apparatus and procedure as in Example 1.

Example 4
In Example 4, a herbicidal sheet was prepared by the same procedure as in Example 1 except that the thickness of the adhesive layer of the herbicidal sheet was changed to 0.5 mm. In Example 4, the characteristic test of the herbicidal sheet was performed by the same apparatus and procedure as in Example 1.

(Example 5)
In Example 5, a herbicidal sheet was produced by the same procedure as in Example 1 except that E5-EC was used for the base material layer. E5-EC is a vinyl chloride sheet containing a woven fabric, and is produced by an impregnation method in which the woven fabric is impregnated with a vinyl chloride sol. In Example 5, the characteristic test of the herbicidal sheet was performed by the same apparatus and procedure as in Example 1.

(Example 6)
In Example 6, a herbicidal sheet was produced by the same procedure as in Example 1 except that E4-EC was used for the base material layer. E4-EC is a vinyl chloride sheet containing a woven fabric, and is produced by an impregnation method in which the woven fabric is impregnated with a vinyl chloride sol. In Example 6, the characteristic test of the herbicidal sheet was performed by the same apparatus and procedure as in Example 1.

(Example 7)
In Example 7, a herbicidal sheet was prepared by the same procedure as in Example 1 except that the thickness of the adhesive layer of the herbicidal sheet was changed to 0.1 mm. In Example 7, the characteristic test of the herbicidal sheet was performed by the same apparatus and procedure as in Example 1.

(Example 8)
In Example 8, a herbicidal sheet was prepared according to the following procedure. That is, first, a mixture was prepared in which a transparent glass container was filled with 2EHA (94 parts by weight), AA (6 parts by weight), and Irgacure 651 (0.04 parts by weight) of a photoinitiator. The mixture was purged with nitrogen to replace dissolved oxygen with nitrogen gas. After substitution with nitrogen gas, the mixture was irradiated with UV light from a UV-A lamp from the outside of the glass container, and the mixture was UV polymerized until the viscosity of the mixture partially reached about 1000 (cP). After irradiation with ultraviolet light, Irgacure 651 (0.1 part by weight) and HDDA (0.08 part by weight) were added to the mixture to prepare a pressure-sensitive adhesive composition.

A silicone-treated polyester film was prepared, and a pressure-sensitive adhesive composition having a thickness of 1.0 mm was knife coated on the polyester film. On the pressure-sensitive adhesive composition provided on the silicone-treated polyester film, another silicone-treated polyester film was further placed to cover the pressure-sensitive adhesive composition. The thickness of the silicone-treated polyester film was 0.05 mm, and the pressure-sensitive adhesive composition was subjected to ultraviolet polymerization by irradiating UV light from a UV-A lamp toward the pressure-sensitive adhesive composition through this polyester film. After UV polymerization of the adhesive composition, an adhesive layer sandwiched between two silicone-treated polyester films was prepared. The intensity of the irradiated ultraviolet light was 0.5 mW / cm ² and the total energy was 1000 mJ / cm ² . Subsequently, E65-EC having a thickness of 0.52 mm was prepared, one of the two silicone-treated polyester films was peeled off, and E65-EC was placed on the surface of the adhesive layer from which the film was peeled off. Then, the adhesion layer was made to adhere to E65-EC of a base material layer by the laminating method, and the weed prevention sheet provided with the adhesion layer and a base material layer was produced. In Example 8, the characteristics test of the herbicidal sheet was performed by the same apparatus and procedure as in Example 1.

Example 9
In Example 9, a herbicidal sheet was prepared by the same procedure as in Example 8 except that a butadiene rubber-based pressure sensitive adhesive transfer tape was used for the base material layer. In Example 9, a herbicidal sheet characteristic test was conducted using the same apparatus and procedure as in Example 1.

(Comparative Example 1)
In Comparative Example 1, a herbicidal sheet was produced by the same procedure as in Example 1 except that E2 was used for the base material layer. E2 is a plasticized vinyl chloride sheet containing a woven fabric, and is produced by an impregnation method in which the woven fabric is impregnated with a vinyl chloride sol. In Comparative Example 1, the characteristics test of the herbicidal sheet was performed by the same apparatus and procedure as in Example 1.

(Comparative Example 2)
In Comparative Example 2, a herbicidal sheet was produced by the same procedure as in Example 8 except that the commercially available sheet 1 was used for the base material layer. In Comparative Example 2, the characteristics test of the herbicidal sheet was performed by the same apparatus and procedure as in Example 1.

(Comparative Example 3)
In Comparative Example 3, a herbicidal sheet was prepared by the same procedure as in Example 1 except that the commercially available sheet 2 was used for the base material layer. The commercial sheet 2 is a herbicidal sheet containing a multilayer nonwoven fabric. In Comparative Example 3, the characteristics test of the herbicidal sheet was performed by the same apparatus and procedure as in Example 1.

(Comparative Example 4)
In Comparative Example 4, a herbicidal sheet was prepared according to the following procedure. That is, first, a mixture was prepared in which a transparent glass container was filled with 2EHA (94 parts by weight), AA (6 parts by weight), and Irgacure 651 (0.04 parts by weight) of a photoinitiator. The mixture was purged with nitrogen to replace dissolved oxygen with nitrogen gas. After the replacement with nitrogen gas, the mixture was irradiated with ultraviolet rays from a UV-A lamp from the outside of the glass container, and the mixture was subjected to ultraviolet polymerization until the viscosity of the mixture partially reached 1000 (cP). After irradiation with ultraviolet light, Irgacure 651 (0.1 part by weight) and HDDA (0.08 part by weight) were added to the mixture to prepare a pressure-sensitive adhesive composition.

A commercial sheet 3 was prepared as a base material layer, and the pressure-sensitive adhesive composition was knife coated on the commercial sheet 3. The thickness of the commercially available sheet 3 was 0.1 mm, and the thickness of the pressure-sensitive adhesive composition on the commercially available sheet 3 was 1.0 mm. The commercial sheet 3 contains an ionomer resin such as a zinc ion crosslinked polyethylene film. A silicone-treated polyester film was placed on the pressure-sensitive adhesive composition provided on the commercially available sheet 3 to cover the pressure-sensitive adhesive composition. The thickness of the silicone-treated polyester film was 0.05 mm, and UV light from a UV-A lamp was irradiated through the polyester film toward the pressure-sensitive adhesive composition. The intensity of the irradiated ultraviolet light was 0.5 mW / cm ² and the total energy was 2000 mJ / cm ² . In Comparative Example 4, the pressure-sensitive adhesive composition was not sufficiently UV polymerized, and no pressure-sensitive adhesive layer was produced. For this reason, measurements of light transmittance, bending resistance, adhesive strength, penetration resistance, and flammability were not performed. When oxygen inhibits radical polymerization of acrylic monomers, it is considered that an olefin film containing an ionomer resin such as the commercially available sheet 3 exhibits high oxygen permeability. In Comparative Example 4, the herbicidal sheet characteristic test was not performed. In addition, E65-EC containing a polyester film and a vinyl chloride resin shows low oxygen permeability.

(Comparative Example 5)
In Comparative Example 5, a herbicidal sheet was produced by the same procedure as in Example 8 except that the commercially available sheet 3 was used for the base material layer. That is, unlike Comparative Example 4, the pressure-sensitive adhesive layer was not directly coated on the commercial sheet 3, and a separate UV-cured pressure-sensitive adhesive layer was bonded to the commercial sheet 3. In Comparative Example 5, the characteristics test of the herbicidal sheet was performed by the same apparatus and procedure as in Example 1.

  Table 1 shows the result of the adhesion layer, the base material layer, and the characteristic test for the herbicidal sheets according to Examples 1 to 3. Table 2 shows the result of the adhesion layer, the base material layer, and the characteristic test for the herbicidal sheets according to Examples 4 to 6. Table 3 shows the result of the adhesion layer, the base material layer, and the characteristic test for the herbicidal sheets according to Examples 7 to 9. Table 4 shows the result of the adhesion layer, the base material layer, and the characteristic test for the herbicidal sheets according to Comparative Examples 1 to 3. Table 5 shows the results of the adhesion layer, the base material layer, and the property test for the herbicidal sheets according to Comparative Examples 4 and 5. In Tables 1 to 5, the bending resistance test results indicate the degree of flexibility measured in the lateral direction of the weedproof sheet.

  In the flammability test, good flame retardancy was shown in Examples 1 to 3. The results of the flammability test in Examples 1 to 3 are classified into category 2 of JIS L 1091 B. In category 2, the fire spread distance is 10 cm or less and the afterflame time is defined as 20 seconds or less. In Examples 1 to 3, the fire spread distance and the afterflame time are less than the prescribed values. In Comparative Example 5 including the ionomer film in the base material layer, the flame of the air mix burner continued to burn even after being released from the grass protection sheet. This result shows that the weedproof sheet of Comparative Example 5 does not have self-extinguishing properties.

  Looking at the measurement results of the bending resistance, in Comparative Example 3, the bending resistance exceeds 150 mm in both the vertical direction and the horizontal direction. In order to attach the weedproof sheet to a stepped portion, it is desired that the weedproof sheet has flexibility. If the stiffness of the weedproof sheet is too strong, it is difficult to attach the weedproof sheet to the step portion, and the effective adhesion area of the adhesive layer is reduced. In addition, even when pressure is applied and the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer follows the stepped portion, the repellent stress of the herbicidal sheet is applied to the pressure-sensitive adhesive layer over a long period of time, and the pressure-sensitive adhesive layer is peeled off from the base material layer. Can be a cause. From the result of the comparative example 3, as for the commercially available sheet | seat 2 which has a multilayer spunbonded nonwoven fabric, the value of bending resistance (mm) is over 150 mm. That is, the commercially available sheet 2 is useful for, for example, mechanically installing a weedproof sheet on a wide area such as a flat portion of a paved road, while being bonded through an adhesive layer at the seam of road asphalt pavement. It is shown that the commercial sheet 2 is less flexible for the intended use.

(Example 10)
In Example 10, a herbicidal sheet was prepared according to the following procedure. That is, first, a mixture was prepared in which a transparent glass container was filled with 2EHA (94 parts by weight), AA (6 parts by weight), and Irgacure 651 (0.04 parts by weight) of a photoinitiator. The mixture was purged with nitrogen to replace dissolved oxygen with nitrogen gas. After the replacement with nitrogen gas, the mixture was irradiated with ultraviolet rays from a UV-A lamp from the outside of the glass container, and the mixture was subjected to ultraviolet polymerization until the viscosity of the mixture partially reached 1000 (cP). After irradiation with ultraviolet light, Irgacure 651 (0.1 part by weight) and HDDA (0.08 part by weight) were added to the mixture to prepare a pressure-sensitive adhesive composition.

A polyester film treated with silicone was prepared, and a pressure-sensitive adhesive composition having a thickness of 0.15 mm was knife coated on the polyester film. A polyamide nonwoven fabric Cerex was prepared, and the pressure-sensitive adhesive composition was covered with Cerex. Cerex has a thickness of 0.04 mm and a basis weight of 10 g / square meter. A 0.15 mm thick adhesive composition was further knife-coated on Cerex provided on the adhesive composition. The thickness (total) of the pressure-sensitive adhesive composition is 0.3 mm. After sufficiently impregnating the pressure-sensitive adhesive composition with Cerex, the UV-A lamp ultraviolet rays are directed toward the pressure-sensitive adhesive composition through the silicone-treated polyester film. Was irradiated to UV-polymerize the pressure-sensitive adhesive composition. After the UV polymerization of the pressure-sensitive adhesive composition, a pressure-sensitive adhesive layer covering Cerex was produced by sandwiching the two silicone-treated polyester films. The intensity of the irradiated ultraviolet light was 0.5 mW / cm ² and the total energy was 1000 mJ / cm ² . After UV polymerization, E65-EC having a thickness of 0.52 mm was prepared, one of the two polyester films was peeled off, and E65-EC was placed on the surface of the adhesive layer from which the film was peeled off. Then, the adhesion layer was made to adhere to E65-EC of a base material layer by the laminating method, and the weed prevention sheet provided with the adhesion layer and a base material layer was produced.

  In Example 10, a 90 degree direction peel adhesion test (to a concrete block) and a 90 degree direction peel adhesion test (to a primer-treated concrete block) with respect to a herbicidal sheet were performed.

(90 degree direction peel adhesion test: against concrete block)
In the 90-degree direction peel adhesion test (to concrete block), the weedproof sheet was cut so as to have a width of 25 mm and a length of 200 mm. The silicone-treated polyester film on the pressure-sensitive adhesive side was peeled off and attached to a standard building concrete block defined in JIS A 5406-2010 so as not to entrain air, and then reciprocally pressure-bonded with a roller having a weight of 2 kg. After curing for 24 hours at room temperature, the peel adhesion of the weedproof sheet was measured by pulling the weedproof sheet in a direction perpendicular to the concrete block surface (angle 90 degrees) at a speed of 300 mm per minute.

(90-degree peel adhesion test: Primer-treated concrete block)
As a primer, rubber-based industrial adhesive EC-1368NT was applied to a standard building concrete block defined in JIS A 5406-2010 using a brush and dried for 24 hours. Thereafter, the herbicidal sheet was cut to have a width of 25 mm and a length of 200 mm. The silicone-treated polyester film on the pressure-sensitive adhesive side was peeled off and attached to the surface on which the primer was applied so as not to entrain air, and then reciprocally pressure-bonded with a roller having a weight of 2 kg. After curing at room temperature for 24 hours, the peel adhesion of the weedproof sheet was measured by pulling the weedproof sheet in a direction perpendicular to the concrete block surface (angle 90 degrees) at a speed of 300 mm / min.

(Example 11)
In Example 11, a herbicidal sheet was prepared by the same procedure as in Example 10 except that the thickness (total) of the pressure-sensitive adhesive composition of the herbicidal sheet was changed to 0.5 mm. In Example 11, a 90-degree peel adhesion test was performed using the same apparatus and procedure as in Example 10.

(Example 12)
In Example 12, a herbicidal sheet was prepared by the same procedure as in Example 10 except that the thickness (total) of the pressure-sensitive adhesive composition of the herbicidal sheet was changed to 1.0 mm. In Example 12, a 90-degree peel adhesion test was performed using the same apparatus and procedure as in Example 10.

  Table 6 shows the result of the adhesion layer, the base material layer, and the property test for the herbicidal sheets according to Examples 10-12.

  Since the weedproof tape which concerns on Examples 10-12 can be easily affixed on a concrete surface or an asphalt surface, it can suppress the growth of weeds. In addition, the adhesive layer has a high adhesive force due to the nonwoven fabric contained in the adhesive layer, and when the adhesive layer is peeled again from the concrete surface or asphalt surface, the adhesive layer is prevented from being transferred to the concrete surface or asphalt surface. The

  As shown in Table 6 and Table 1, in the herbicidal tape according to Examples 11 and 12, 90 degree direction peeling as compared with the herbicidal tape according to Examples 4 and 1 having the same thickness adhesive layer, respectively. The adhesion (to concrete block) is further improved. In the pressure-sensitive adhesive layer including the nonwoven fabric, the cohesive force (integration) of the resin in the pressure-sensitive adhesive layer is increased, and as a result, the bonding between the resins in the pressure-sensitive adhesive layer is strengthened, and as a result, the peeling of the pressure-sensitive adhesive layer is further reduced.

  DESCRIPTION OF SYMBOLS 1, 1P ... Herbicidal sheet, 10 ... Base material layer, 11 ... Woven cloth, 12 ... Resin part, 20, 20P ... Adhesive layer, 21 ... Nonwoven fabric.

Claims (9)

A weedproof sheet,
A base material layer;
An adhesive layer laminated to the base material layer;
With
The base material layer has a woven fabric and a resin portion covering the woven fabric,
The thickness of the base material layer is 0.3 mm or more and 0.8 mm or less,
The herbicidal sheet has a light transmittance of less than 0.3%.   The weedproof sheet according to claim 1, wherein the woven fabric has a thickness of 0.15 mm or more and 0.5 mm or less.   The weedproof sheet according to claim 1 or 2, wherein the number of fibers contained in the woven fabric is 20 or more and 80 or less per 25 mm.   The woven fabric includes one or more fibers selected from the group consisting of nylon fibers, vinylon fibers, polypropylene fibers, polyester fibers, cotton, hemp, and polyethylene fibers. Herbicidal sheet.   The said resin part is a weedproof sheet as described in any one of Claims 1-4 containing a vinyl chloride resin or polyolefin resin.   The weedproof sheet according to any one of claims 1 to 5, wherein a thickness of the adhesive layer is 0.2 mm or more and 1.5 mm or less.   The said adhesion layer is a weedproof sheet as described in any one of Claims 1-6 containing a photocurable acrylic resin.   The said adhesion layer is a weedproof sheet as described in any one of Claims 1-7 which further has the nonwoven fabric covered with the said adhesion layer.   The weedproof sheet according to claim 8, wherein the nonwoven fabric includes spunbond fibers.

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