JP6794122B2 - Water-repellent weed-proof sheet and how to use it - Google Patents

Description

The present invention relates to a water-repellent weed-proof sheet for suppressing the growth of plants such as weeds on the ground and a method of using the same.

Weed-proof sheets are laid on the ground as a method of suppressing the growth of plants such as weeds from the ground on roads (roadways, sidewalks, etc.), railroad tracks, parks, farms, forestry gardens, their surroundings, and riverbeds. The method is known. In general, the weed-proofing effect of the weed-proofing sheet includes the effect of preventing the germination of weed seeds and the growth of weeds by photosynthesis in the lower layer of the weed-proofing sheet due to the high shading rate, and the effect of weeds in the lower layer of the weed-proofing sheet due to the high strength. The effect of preventing growth is the mainstream. On the other hand, even if the growth of weeds in the lower layer of the weed control sheet can be suppressed, when the seeds fly onto the weed control sheet, the seeds may germinate and grow due to the water content on the sheet. However, the weed control effect on the weed control sheet is not considered very much.

Japanese Patent Application Laid-Open No. 9-67571 (Patent Document 1) lays a weed-proof sheet having light-shielding property, penetration resistance to plant buds, water permeability, and breathability on the surface of the target site, and also contains silicon. A soil improvement material layer formed of a water-repellent soil improvement material coated with silicone on the surface of one or more raw materials selected from the group of incineration ash of soil, sand, pebbles, and household dust is prevented. The weed control structure provided on the grass sheet is disclosed. In this document, a commercially available high-density spunbonded non-woven fabric made of polyester fiber is described as the weed-proof sheet. Furthermore, it is stated that rainwater does not penetrate into the soil improvement material layer, and the water remaining on the surface evaporates rapidly due to solar heat and wind, so that there is no water and germination of flying seeds can be prevented.

However, this structure is a complicated structure in which a land improvement layer is further laid on the weed control sheet, and the workability is low. Furthermore, since the land improvement material is formed of silicone-coated sand or the like, for example, when it is applied to a slope, the soil improvement material layer easily collapses, so that the weed control effect on the weed control sheet is not sufficient. .. In addition, the weed control effect on the plants growing on the soil improvement material layer is not sufficient.

JP-A-9-67571 (Claim 1, paragraphs [0011] [0013] [0014])

Therefore, an object of the present invention is to provide a weed-proof sheet capable of suppressing the growth of plants such as weeds with a simple structure and a method of using the same.

Another object of the present invention is to provide a weed-proof sheet and a method of using the same, which can prevent water accumulation on the surface and suppress the growth of the plant even if the seeds of the plant fly onto the sheet.

Another object of the present invention is to provide a weed-proof sheet which can be easily applied to a slope or a ground having an uneven shape and which can maintain a weed-proof effect and a method of using the same.

As a result of diligent studies to achieve the above problems, the present inventors have found that the growth of plants such as weeds can be suppressed by combining a cloth and a water repellent with a simple structure, and completed the present invention.

That is, the weed-proof sheet of the present invention is a weed-proof sheet for suppressing the growth of plants, and includes a cloth and a water repellent. The water repellent may be attached to the surface of the fibers constituting the fabric. The water repellent may be a fluorine-based water repellent. The fabric may be a non-woven fabric (particularly a short-fiber non-woven fabric containing polyester fibers). The short fiber non-woven fabric may further contain binder fibers. The fabric may have a basis weight of 50 to 1000 g / m ² and an apparent density of 0.05 to 0.5 g / cm ³ . The shading rate of the fabric may be 90% or more. The ratio of the water repellent is about 0.1 to 10 parts by mass with respect to 100 parts by mass of the fabric. The weed-proof sheet of the present invention may have a water absorption of 100 g / m ² or less. Further, the weed-proof sheet of the present invention may have a breathability of 1 to 100 m / kPa · s.

The present invention also includes a method of using the weed-proof sheet by laying the weed-proof sheet on the ground to suppress the growth of plants.

In the present invention, since the cloth and the water repellent are combined, the growth of plants such as weeds can be suppressed with a simple structure. In addition, it is possible to prevent water accumulation on the surface, and even if the seeds of the plant fly onto the sheet, the growth of the plant can be suppressed. Further, since the weed-proof sheet of the present invention is formed of the cloth alone, it is flexible and can be easily applied to the ground having a slope or uneven shape, and the water repellent agent is applied to the surface of the fibers constituting the cloth. It is an object of the present invention to provide a weed control sheet capable of sustaining the weed control effect because it is attached and a method of using the same.

[Fabric]
The weed-proof sheet of the present invention contains a cloth and a water-repellent agent, and is usually formed of a sheet-like cloth containing the water-repellent agent.

Examples of the cloth include woven cloth, knitted cloth, net, paper, non-woven fabric and the like. Of these, woven fabrics, knitted fabrics, and non-woven fabrics are preferable from the viewpoint of excellent holding power and light-shielding property of water repellent, and non-woven fabric is particularly preferable from the viewpoint of excellent weed resistance. The non-woven fabric may be made of either organic fiber or inorganic fiber.

Examples of organic fibers include natural fibers (cellulose fibers such as cotton, caboc, hemp, protein fibers such as wool and silk), regenerated fibers (rayon, polynosic, cupra, lyocell, etc.), and semi-synthetic fibers (triacetate fibers, etc.). Acetate fiber, etc.), synthetic fiber [polyamide fiber (polyamide fiber, polypropylene fiber, etc.), styrene fiber, tetrafluoroethylene fiber, acrylic fiber, vinyl alcohol fiber (ethylene vinyl alcohol fiber, etc.), polychloride Vinyl-based fibers, fluorine fibers, polyester fibers (poly-C _2-4 alkylene allylate fibers such as polyethylene terephthalate and polyethylene naphthalate, all-aromatic polyester fibers such as liquid crystal polyester fibers, etc.), polyamide fibers (polyamide 6, polyamide 66, etc.) (Adipose polyamide fiber, total aromatic polyamide fiber such as aramid fiber, etc.), polyurethane fiber, polyacetal fiber, benzoate fiber, polyphenylene sulfide fiber, heterocyclic polymer fiber, etc.] and the like. These organic fibers can be used alone or in combination of two or more.

Examples of the inorganic fiber include glass fiber, carbon fiber, activated carbon fiber, alumina fiber, silicon carbide fiber, boron fiber, tyranno fiber, and metal fiber (gold fiber, silver fiber, copper fiber, steel fiber, aluminum fiber, stainless steel). (Fiber, etc.) and the like. These inorganic fibers can be used alone or in combination of two or more.

Further, organic fibers and inorganic fibers may be combined. Among these fibers, organic fibers are preferable because they are excellent in lightness and flexibility, synthetic fibers such as polyolefin fibers, polyester fibers, and polyamide fibers are widely used, and polypropylene fibers are used in terms of mechanical properties. , Polyester fiber is preferable, and polyester fiber is particularly preferable from the viewpoint of non-woven fabric processability and the like.

The fibers constituting the fabric may be spun yarn, monofilament, multifilament or the like depending on the type of fiber, and the cross-sectional shape thereof (in the case of multifilament, the cross-sectional shape of the monofilament) is a general solid. The cross-sectional shape is not limited to a round cross-section or atypical cross-section [flat, elliptical, polygonal, 3 to 14 leaf-shaped, T-shaped, H-shaped, V-shaped, dogbone (I-shaped), etc.] , Hollow cross section, etc., but usually has a round cross section. The short fiber is usually a spun yarn or a monofilament cut yarn.

The average fineness of the fiber may be, for example, 0.1 to 20 dtex, preferably 0.3 to 10 dtex, and more preferably about 0.5 to 7 dtex. If the average fineness is too small, plants may grow on the sheet that has absorbed water, and if it is too large, the gaps between the fibers may become large and the shading rate may decrease.

The fiber may be a long fiber having a length of more than 150 mm (for example, a long fiber having an infinite length), but a short fiber is preferable because it has a low basis weight and it is easy to adjust a uniform density and thickness. The average fiber length of the short fibers may be about 150 mm or less, for example, 10 to 150 mm, preferably 15 to 100 mm (for example, 20 to 80 mm), and more preferably about 25 to 70 mm (particularly 30 to 60 mm). If the fiber length of the short fibers is too long, the water retention capacity and flexibility may decrease, and it may be difficult to adjust the uniform density and thickness. If the short fibers are too long, the morphological stability may decrease.

The fabric can be produced by a conventional method. For example, in the case of a short fiber non-woven fabric, the fabric can be prepared through a web forming step containing the fibers and a web bonding step. Specifically, a card method using staple fibers or the like. After forming the web by a dry method such as the air array method, the web may be bonded by a chemical bond, a thermal bond, a spunlace, a needle punch, a stitch bond method or the like. Among these bonding methods, the chemical bond method and the thermal bond method are preferable from the viewpoint of high uniformity of the fiber structure, and the needle punch method is particularly preferable from the viewpoint of obtaining a bulky non-woven fabric having excellent water permeability. Further, the chemical bond or thermal bond method and the needle punch method may be combined.

When a binder is used in the chemical bond or thermal bond method, a conventional binder can be used as the binder, but it is preferable to use a binder fiber from the viewpoint of the productivity of the non-woven fabric. The binder fiber may be a fiber having a low melting point resin at least on the surface of the fiber. For example, a core having a sheath made of a low melting point resin (polyethylene resin such as polyethylene, amorphous polyester, etc.) Examples thereof include sheath-type binder fibers (for example, core-sheath-type binder fibers formed of a sheath portion made of a polyethylene resin and a core portion made of polyester). The proportion of the binder fiber is, for example, 0.1 to 50% by mass, preferably 1 to 30% by mass, and more preferably 2 to 20% by mass (particularly 3 to 10% by mass) with respect to the entire fabric.

Further, the long-fiber non-woven fabric can be produced by a conventional method, for example, a direct spinning method such as spunbonding, melt blowing, or flash spinning. Of these, the non-woven fabric obtained by the spunbond method is widely used from the viewpoint of economy and the like.

As the cloth, a plurality of cloths may be laminated, or different kinds of cloths, for example, a short fiber non-woven fabric and a long fiber non-woven fabric may be laminated. When a plurality of fabrics are laminated, the number of laminated fabrics is, for example, about 2 to 6 (particularly 2 to 4).

The fabric (or the fibers constituting the fabric) may contain a colorant such as a dye or a pigment, and depending on the intended use, it may be contained inside the fiber or adhered to the fiber surface to give a desired color. You may. For example, a black colorant may be included in order to improve the shading rate. Further, a plurality of colorants may be combined, a colorant for imparting decorativeness to the fibers on the surface of the sheet may be contained, and a colorant for improving the light shielding rate may be contained inside the sheet. The ratio of the colorant is, for example, 0.01 to 10% by mass, preferably 0.05 to 5% by mass, and more preferably 0.1 to 3% by mass with respect to the entire fabric.

The fibers that make up the fabric are further conventional additives such as stabilizers (light-resistant stabilizers, heat-resistant stabilizers, antioxidants, etc.), fillers, flame retardants, antistatic agents, surfactants, plasticizers, foaming agents. It may contain an agent, a defoaming agent, a plant repellent (root repellent), an insect repellent (anticide, etc.), an antiseptic (antifungal agent, antibacterial agent, etc.) and the like.

The basis weight of the fabric (particularly the non-woven fabric) is, for example, 50 to 1000 g / m ² , preferably 100 to 900 g / m ² (for example, 200 to 800 g / m ² ), and more preferably 300 to 750 g / m ² (particularly 500 to 700 g / m ² ). It is about m ² ). If the basis weight is too large, the flexibility may be lowered, and if it is too small, the light-shielding property may be lowered and the mechanical properties may be lowered.

The apparent density of the fabric (particularly the non-woven fabric) is, for example, 0.05 to 0.5 g / cm ³ , preferably 0.07 to 0.4 g / cm ³ (particularly 0.08 to 0.3 g / cm ³ ), and further. It is preferably about 0.1 to 0.2 g / cm ³ (particularly 0.12 to 0.15 g / cm ³ ). If the density is too high, plants may grow on the sheet that has absorbed water, and if it is too low, the gaps between the fibers may become large and the shading rate may decrease.

The light-shielding rate of the fabric (particularly the non-woven fabric) is preferably high, for example, 90% or more, preferably 95% or more, still more preferably 99% or more, from the viewpoint of suppressing the growth of plants through the weed-proof sheet. (Especially 100%). In addition, within the scope of the present specification and claims, the shading rate can be measured by a method conforming to JIS L1055.

The proportion of fibers in the fabric is 50% by mass or more, for example 60% by mass or more, preferably 80% by mass or more, still more preferably 90% by mass or more, and the fabric is usually substantially only fibers (100% by mass). ) May be formed.

[Water repellent]
The weed-proof sheet of the present invention further contains a water repellent. The water repellent is usually attached to the surface of the fibers constituting the fabric, and is preferably adhered uniformly to the entire fibers constituting the fabric from the viewpoint of improving the weed resistance. In the present invention, in addition to the light-shielding property of the cloth, the cloth contains a water repellent, so that the evaporation of water from the ground (permeation of water vapor from the ground) and the accompanying exudation of nutrients are caused by the water repellency of the water repellent. Probably because it can be suppressed, the growth of plants on the weed control sheet can be suppressed.

The water repellent is not particularly limited as long as it can impart water repellency to the fabric, and examples thereof include wax-based water repellents (paraffin wax, polyethylene wax, etc.), fluorine-based water repellents, and silicone-based water repellents.

The water contact angle of the water repellent may be 110 ° or more, for example, 110 to 150 °, preferably 115 to 140 °, and more preferably 120 to 130 °. If the water contact angle is too small, the water repellency will be low and the weed control property may be lowered. In the present specification and claims, the water contact angle can be measured by the method described in Examples described later.

Of these water repellents, fluorine-based water repellents are preferable because they have high hydrophobicity and can impart high water repellency.

As the fluorine-based water repellent, for example, a fluoroalkane in which a radically polymerizable group and / or a hydrolyzable condensable group is linked via a direct bond or a linker (for example, fluoroC _1-12 alkane, preferably _{fluoroC 2- 10} alkanes, more preferably fluoro C _4-8 alkanes) and the like. Examples of the linker include a divalent linker, for example, an alkyleneoxy group (such as a C _2-4 alkyleneoxy group such as an ethyleneoxy group or a propyleneoxy group) in which an oxygen atom or a fluorine atom may be substituted.

Examples of the radically polymerizable group include a vinyl group in which a fluorine atom may be substituted, a (meth) acryloyl group, and the like. The hydrolysis-condensable group includes a substituted silyl group, for example, a halosilyl group (chlorosilyl group, etc.), a hydroxysilyl group, an alkoxysilyl group ( _C1-4 alkoxysilyl group such as methoxysilyl group, ethoxysilyl group, etc.). , Aryloxysilyl group and the like can be exemplified. The fluorine compound may have a plurality of (for example, 2 to 4, preferably about 2 to 3) radically polymerizable groups or hydrolyzable condensable groups.

Examples of the fluorine-based water repellent having a radically polymerizable group include fluoroC _2-6 olefins such as vinylfluorolide, vinylidenefluorolide, chlorotrifluoroethylene, tetrafluoroethylene, and hexafluoropropylene; perfluoro (methyl vinyl ether). ), Perfluoro (ethyl vinyl ether), fluoro (C _1-6 alkyl vinyl ether) such as perfluoro (propyl vinyl ether); 2,2,2-trifluoroethyl (meth) acrylate, 2,2,3,3-tetra Fluoropropyl (meth) acrylate, 1H, 1H, 5H-octafluoropentyl (meth) acrylate, 2- (perfluorobutyl) ethyl (meth) acrylate, 2- (perfluorohexyl) ethyl (meth) acrylate, 2- ( Examples thereof include _{fluoroC 1-12} alkyl (meth) acrylates such as perfluorooctyl) ethyl (meth) acrylates.

Examples of the fluorine-based water repellent having a hydrolyzable condensing group include 3,3,3-trifluoropropyltrimethoxysilane, 3,3,3-trifluoropropyltriethoxysilane, and 2- (perfluorobutyl). Ethyltrimethoxysilane, 2- (perfluorobutyl) ethyltriethoxysilane, 2- (perfluorohexyl) ethyltrimethoxysilane, 2- (perfluorohexyl) ethyltriethoxysilane, 2- (perfluorooctyl) ethyltri FluoroC _1-12alkyl C _1-4 alkoxysilanes such as methoxysilane, 2- (perfluorooctyl) ethyltriethoxysilane; (fluoroC _1-6 alkoxy) such as 3- (perfluoroisopropoxy) propyltrimethoxysilane C _1-6 alkyl) C _1-4 alkoxysilane; 3,3,3-trifluoropropylmethyldichlorosilane, 3,3,3-trifluoropropyltrichlorosilane, 2- (perfluorobutyl) ethyldimethylchlorosilane, 2 -(Perfluorobutyl) ethylmethyldichlorosilane, 2- (perfluorobutyl) ethyltrichlorosilane, 2- (perfluorohexyl) ethylmethyldichlorosilane, 2- (perfluorohexyl) ethyltrichlorosilane, 2- (perfluorohexyl) FluoroC _1-12 alkylhalosilanes such as octyl) ethylmethyldichlorosilane, 2- (perfluorooctyl) ethyltrichlorosilane; (fluoroC _1-6 alkoxyC ₁ ) such as 3- (perfluoroisopropoxy) propyltrichlorosilane _-6alkyl ) halosilane; silanol corresponding to these silane compounds; partial hydrolysates of these silane compounds can be exemplified.

Examples of the fluorine-based water repellent having both a radically polymerizable group and a hydrolyzable condensing group include 1H, 1H, 2H, 2H, 11H, 12H, and 12H-hexadecafluorododecane-11-ene-1-yl. Fluoro C _2-12 alkenyl C _1-4 alkoxysilanes such as trimethoxysilane; fluoro C such as 1H, 1H, 2H, 2H, 11H, 12H, 12H-hexadecafluorododecane-11-ene-1-yltrichlorosilane Examples thereof include _2-12 alkenylhalosilanes; silanols corresponding to these silane compounds; and partial hydrolysates of these silane compounds.

These fluorine-based water repellents can be used alone or in combination of two or more. Among these fluorine-based water repellents, fluoroC _1-12 alkane in which a radical polymerizable group and / or a hydrolyzable condensable group is directly bonded, for example, fluoroC _1-12 alkyl (meth) acrylate, fluoroC _{1- 12} Alkyl C _1-4 alkoxysilanes (eg, fluoroC _1-12 alkyltri C _1-4 alkoxysilanes), fluoroC _1-12 alkylhalosilanes (eg, fluoroC _1-12 alkyltrihalosilanes) are preferred, and in particular. , Perfluoro C _4-8 alkyl C _2-4 alkyl (meth) acrylate, perfluoro C _4-8 alkyl C _2-4 alkyl tri C _1-2 alkoxysilane, perfluoro C _4-8 alkyl C _2-4 alkyl Trihalosilane is preferred.

In the fluorine-based water repellent (or fluoroalkyl chain portion), the number of carbon atoms substituted by fluorine atoms (the number of substitutions of fluorine atoms in one molecule) is, for example, 1 to 12, preferably 1 to 10, and further. It may be preferably about 1 to 8 (particularly 1 to 6), and usually about 2 to 10 (particularly 4 to 8). If the number of carbon atoms substituted by fluorine atoms is too small, the water repellency may not be sufficiently improved, and if it is too large, the cost increases, decomposition in the natural world becomes difficult, and the environmental load increases.

The ratio of the water repellent agent may be 1 part by mass or more with respect to 100 parts by mass of the cloth, for example, 0.1 to 10 parts by mass, preferably 0.2 to 8 parts by mass (for example, 0.3 to 5 parts by mass). Parts), more preferably about 0.5 to 3 parts by mass (particularly 1 to 2 parts by mass). If the proportion of the water repellent is too small, the weed resistance may decrease.

[Weed control sheet]
The weed-proof sheet of the present invention has excellent water repellency and may have a water contact angle of 110 ° or more, for example, at 110 to 150 °, preferably 115 to 140 °, and more preferably about 120 to 130 °. There may be. If the water contact angle is too small, the water repellency will be low and the weed control property may be lowered.

Anti-weed sheet of the present invention has a low water absorption, water absorption degree may also be 100 g / ^{m 2} or less, for example 1 to 100 g / ^{m 2,} preferably from 5 to 50 g / ^{m 2,} more preferably 10~30g It is about / m ² (particularly 15 to 25 g / m ² ). If the degree of water absorption is too high, the weed resistance may decrease or water may accumulate on the sheet surface. In addition, within the scope of this specification and claims, the water absorption degree can be measured in accordance with JIS P8140: 1998, and in detail, it can be measured by the method described in Examples described later.

The weed-proof sheet of the present invention has high water permeability and may have a water permeability coefficient of 0.01 cm / s or more, for example, 0.01 to 0.1 cm / s, preferably 0.015 to 0.05 cm / s. More preferably, it is about 0.02 to 0.03 cm / s. If the water permeability coefficient is too low, the weed resistance may decrease or water may accumulate on the sheet surface. In addition, within the scope of this specification and claims, the water permeability can be measured in accordance with JIS A1218, and in detail, it can be measured by the method described in Examples described later.

The weed-proof sheet of the present invention has appropriate air permeability, and the air permeability is, for example, 1 to 100 m / kPa · s, preferably 2 to 50 m / kPa · s, and more preferably 3 to 20 m / kPa · s. It is about s (particularly 5 to 10 m / kPa · s). If the air permeability is too high, the light-shielding property and the weed-proof property may be lowered, and if it is too low, the weed-proof property may be lowered or water may be accumulated on the sheet surface. In addition, within the scope of this specification and claims, the air permeability can be calculated by measuring the pressure loss ventilation resistance, and in detail, it can be measured by the method described in Examples described later.

The average thickness of the weed-proof sheet of the present invention may be, for example, 0.3 mm or more, for example, 0.4 to 10 mm, preferably 0.5 to 8 mm, more preferably 2 to 6 mm (particularly 3 to 5 mm). There may be. If the thickness is too thin, the weed control effect may decrease.

The weed-proof sheet of the present invention exhibits excellent weed-proof properties by itself, but may further include a conventional functional layer, for example, a repellent layer.

The method for producing a weed-proof sheet of the present invention is not particularly limited as long as a water-repellent agent can be attached to the surface of the fibers constituting the fabric, but usually, the fabric is composed of a liquid composition (treatment agent) containing the water-repellent agent. This is a method of surface-treating fibers. Examples of the surface treatment method include coating, dipping, spraying, and the like, and after these treatments, drying may be performed if necessary. The drying temperature is, for example, 50 to 200 ° C, preferably 70 to 170 ° C, and more preferably about 80 to 150 ° C. The drying time is, for example, 1 second to 30 minutes, preferably 2 seconds to 15 minutes, and more preferably 5 seconds to 1 minute.

The treatment agent usually contains a solvent in addition to the water repellent. Examples of the solvent include water-based solvents such as water, alcohols (ethanol, ethylene glycol, etc.), ketones (acetone, etc.), cyclic ethers (dioxane, tetrahydrofuran, etc.), cellosolves (methyl cellosolve, ethyl cellosolve, etc.), and calvi. Examples thereof include tolls (methylcarbitol, ethylcarbitol, etc.), glycol ether esters (cellosolve acetate, etc.), and the like. These solvents can be used alone or as a mixed solvent.

The ratio of the solvent is, for example, 3 to 1100 parts by mass (for example, 5 to 1000 parts by mass), preferably 10 to 800 parts by mass (for example, 100 to 600 parts) with respect to 1 part by mass of the water repellent (particularly the fluorine-based water repellent). By mass), more preferably about 150 to 500 parts by mass (particularly 200 to 300 parts by mass). If the proportion of the solvent is too small, it becomes difficult to perform a uniform surface treatment and the water repellency may decrease. If the proportion of the solvent is too large, the fluidity of the treatment agent becomes high and it easily spills from the material to be treated. There is a risk that the water repellency will decrease.

If necessary, the treatment agent may contain other additives such as stabilizers, thickeners, viscosity modifiers, defoamers, dispersants, leveling agents, colorants and the like.

The ratio of the water repellent (particularly the fluorine-based water repellent) to 100 parts by mass of the entire treatment agent can be selected from the range of, for example, about 0.1 to 40 parts by mass (for example, 0.2 to 35 parts by mass). For example, it is about 0.1 to 1 part by mass, preferably 0.2 to 0.6 part by mass, and more preferably about 0.3 to 0.5 part by mass (particularly 0.4 to 0.5 part by mass).

The weed-proof sheet of the present invention can suppress the growth of plants such as weeds by a simple method of simply laying it on the ground. Further, since the weed-proof sheet of the present invention has a sheet shape, it can be easily applied to a slope or the like, and because it has excellent flexibility, it can follow an uneven ground. Further, the weed control sheet of the present invention may be laid on the surface of an existing weed control sheet to suppress the growth of plants due to seeds flying to the surface.

Further, the weed-proof sheet of the present invention may be laid alone on the ground in the plane direction of the ground, but usually, a plurality of weed-proof sheets are laid in combination on the ground. When a plurality of weed control sheets are combined, it is preferable to stack the ends of the adjacent weed control sheets in order to prevent the growth of plants from the joints between the adjacent weed control sheets. The stacking width between the ends (the width of the overlapping portion due to stacking) may be, for example, 30 mm or more, for example, 40 to 150 mm, preferably 60 to 120 mm, and more preferably about 80 to 100 mm. If the stacking width is too small, plants may easily grow from the seams between the ends.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. The materials used in the examples and the method for measuring each physical property value in the examples are shown below.

[Material used]
Polyester short fiber non-woven fabric A: "NAUSG felt" manufactured by Unix Co., Ltd., grain size 120 g / m ² , apparent density 0.075 g / cm ³ , average thickness 1.6 mm, shading rate 94.23%, formed of polyethylene. Contains 5% by mass of core-sheath type binder fiber having a sheath and a core made of polyester Polyester short fiber non-woven fabric B: "NAUSG felt" manufactured by Unix Co., Ltd., grain 240 g / m ² , apparent density 0. 12 g / cm ³ , average thickness 2.01 mm, shading rate 99.85%, 5% by mass of core-sheath type binder fiber having a sheath made of polyethylene and a core made of polyester Polyester short fiber non-woven fabric C: "Needful weed control sheet" manufactured by Tanaka Co., Ltd., grain size 600 g / m ² , apparent density 0.15 g / cm ³ , average thickness 4 mm, shading rate 100%, formed of sheath and polyester made of polyethylene. Containing 5% by mass of core-sheath type binder fiber having a core part, needle punched non-woven fabric, water-permeable non-woven fabric with a thickness of 1 mm on one side being green and the other part being black Laminated polyester non-woven fabric D: manufactured by Shirasaki Corporation "Chigaya sheet", grain size 310g / m ² , apparent density 0.16g / cm ³ , average thickness 2.0mm, shading rate 99.99%, laminated sheet of short polyester fiber non-woven fabric and long polyester fiber non-woven fabric Laminated polypropylene length Fiber non-woven fabric E: "Zaburn weed-proof sheet" manufactured by DuPont, with a grain of 136 g / m ² , apparent density of 0.34 g / cm ³ , average thickness of 0.4 mm, shading rate of 94.54%, 4-layer polypropylene long-fiber non-woven fabric Laminated sheet Polypropylene long fiber non-woven fabric F: HANIL SYNTHETIC FIBER "PD3080UG1N", grain 80g / m ² , apparent density 0.20g / cm ³ , average thickness 0.4mm, shading rate 97.63%
Water repellent: "AGE060" manufactured by Asahi Glass Co., Ltd., a fluorine-based water repellent having an acryloyl group and having 6 substitutions of fluorine atoms in one molecule, an aqueous dispersion having a solid content of 20% by mass.

[Average thickness]
The measurement was performed using a stylus having a diameter of 5 mm and a mass of 20 g according to the JIS K6250 10.1 A method.

[Shading rate]
The measurement was performed by a method conforming to JIS L1055.

[Weed control (germination test)]
After filling the pot with soil, a weed control sheet was laid so as to completely cover the surface of the soil. Thirty Western turf seeds were uniformly sown on the laid weed control sheet, and the soil was piled on it to a thickness of 15 mm. In addition, 20 ml of distilled water was added daily, and the growth status of all plants was confirmed 20 days later. As a blank, when the growth condition was confirmed without laying a weed control sheet, the number of germination of 16 or more could be confirmed. As an evaluation of weed control, the length of the above-ground stem of the grown plant was measured, and as the growth rate, a numerical value compared with the average length of the blank was obtained and evaluated according to the following criteria. Furthermore, the number of germinated germination was confirmed and evaluated according to the following criteria, and then evaluated according to the following criteria. The change in the growth rate indicates the inhibitory ability of the weed control sheet to the elongation growth of the plant, and the change in the germination number indicates the inhibitory ability of the weed control sheet to the germination of the plant.

(Growth rate)
◯: Less than 30% Δ: 30% or more and less than 50% ×: 50% or more.

(Number of germination)
◯: 10 or less Δ: 11 or more and 15 or less ×: 16 or more.

[Water absorption]
In accordance with JIS P8140: 1998 "Paper and Paperboard-Water Absorption Test Method-Cobb Method", the test was conducted using 5 test pieces for each type of weed control sheet with a contact time of 60 seconds. In addition, since this test assumes water from below the ground, the measurement was performed using only the side in contact with the ground during construction.

[Breathability]
Using a breathability tester (“KES-F8-API” manufactured by Kato Tech Co., Ltd.), pass a 50 mm × 50 mm square test piece and release / suck a constant flow rate of air (4 cc · cm ² / s). The pressure loss ventilation resistance (kPa · s / m) at that time was measured, and the air permeability (m / kPa · s) was calculated based on this resistance value.

[Permeability]
The hydraulic conductivity (cm / s) was measured by the constant hydraulic conductivity test method in accordance with JIS A1218 "Soil hydraulic conductivity test method".

Example 1
To 38.9 g of ethanol, 1.1 g of a water repellent treatment agent was added and stirred at room temperature for 5 minutes to prepare a treatment agent. A polyester short fiber non-woven fabric A (size 150 mm × 200 mm) was immersed in the obtained treatment agent for 5 minutes, then the non-woven fabric A was taken out from the treatment agent and dried in a constant temperature bath at 125 ° C. for 3 minutes to prepare a weed-proof sheet. .. In the obtained weed-proof sheet, the ratio (adhesion amount) of the water-repellent agent was 4.23 g in terms of solid content with respect to 100 g of the polyester short fiber non-woven fabric A.

Example 2
A weed-proof sheet was produced by the same method as in Example 1 except that the polyester short-fiber nonwoven fabric A was changed to the polyester short-fiber nonwoven fabric B. In the obtained weed-proof sheet, the ratio (adhesion amount) of the water-repellent agent was 3.64 g in terms of solid content with respect to 100 g of the polyester short fiber non-woven fabric B.

Example 3
A weed-proof sheet was produced by the same method as in Example 1 except that the polyester short-fiber nonwoven fabric A was changed to the polyester short-fiber nonwoven fabric C. In the obtained weed-proof sheet, the ratio (adhesion amount) of the water-repellent agent was 7.19 g in terms of solid content with respect to 100 g of the polyester short fiber non-woven fabric C.

Example 4
A weed-proof sheet was produced by the same method as in Example 1 except that the polyester short fiber nonwoven fabric A was changed to the laminated polyester nonwoven fabric D. In the obtained weed-proof sheet, the ratio (adhesion amount) of the water-repellent agent was 19.08 g in terms of solid content with respect to 100 g of the laminated polyester nonwoven fabric D.

Example 5
A weed-proof sheet was produced by the same method as in Example 1 except that the polyester short-fiber nonwoven fabric A was changed to the laminated polypropylene long-fiber nonwoven fabric E. In the obtained weed-proof sheet, the ratio (adhesion amount) of the water-repellent agent was 7.52 g in terms of solid content with respect to 100 g of the laminated polypropylene long-fiber non-woven fabric E.

Example 6
A weed-proof sheet was produced by the same method as in Example 1 except that the polyester short-fiber nonwoven fabric A was changed to the polypropylene long-fiber nonwoven fabric F. In the obtained weed-proof sheet, the ratio (adhesion amount) of the water-repellent agent was 3.95 g in terms of solid content with respect to 100 g of the polypropylene long fiber non-woven fabric F.

Comparative Example 1
The polyester short fiber non-woven fabric A was used as a weed-proof sheet without being treated with a water repellent.

Comparative Example 2
The polyester short fiber non-woven fabric B was used as a weed-proof sheet without being treated with a water repellent.

Comparative Example 3
The polyester short fiber non-woven fabric C was used as a weed-proof sheet without being treated with a water repellent.

Comparative Example 4
The laminated polypropylene non-woven fabric E was used as a weed-proof sheet without being treated with a water repellent.

Table 1 shows the results of evaluating the weed control, water absorption, breathability, and water permeability of the weed control boards of Examples and Comparative Examples.

As is clear from the results in Table 1, the weed-proof sheet of the example was excellent in weed-proof property, but the weed-proof sheet of the comparative example was low in weed-proof property.

The weed-proof sheet of the present invention is a weed-proof sheet for suppressing the growth of plants such as weeds on roads (roadways, sidewalks, etc.), railroad tracks, parks, farms, afforestation gardens, their surroundings, riverbeds, and the like. Can be used.

Claims (10)

A weed-proof sheet for suppressing the growth of plants, which has a water absorption rate of 15 to 100 g / m ² , a water contact angle of 110 ° or more, is formed of a cloth containing a water repellent , and has a water repellency. A weed-proof sheet in which a liquid agent adheres to the surface of fibers constituting the fabric. The weed-proof sheet according to claim 1, wherein the water repellent is a fluorine-based water repellent. The weed-proof sheet according to claim 1 or 2, wherein the cloth is a non-woven fabric. The weed-proof sheet according to claim 3, wherein the non-woven fabric is a short-fiber non-woven fabric containing polyester fibers. The weed-proof sheet according to claim 4, wherein the short-fiber non-woven fabric further contains binder fibers. The weed-proof sheet according to any one of claims 1 to 5, wherein the fabric has a basis weight of 50 to 1000 g / m ² and an apparent density of 0.05 to 0.5 g / cm ³ . The weed-proof sheet according to any one of claims 1 to 6, wherein the light-shielding rate of the fabric is 90% or more. The weed-proof sheet according to any one of claims 1 to 7, wherein the ratio of the water repellent agent is 0.1 to 10 parts by mass with respect to 100 parts by mass of the fabric. The weed-proof sheet according to any one of claims 1 to 8, wherein the air permeability is 1 to 100 m / kPa · s. A method for using the weed-proof sheet according to any one of claims 1 to 9 by laying the weed-proof sheet on the ground to suppress the growth of plants.