JP2021146581A - Mesh sheet - Google Patents

Abstract

To provide a mesh sheet having excellent weather resistance when being used outdoors for a long period of time.SOLUTION: A mesh sheet has a base material having a mesh structure and a protective layer, in which the protective layer is provided on a first main surface side of the base material and on a side face side of an opening in the mesh structure of the base material, and the protective layer contains a hydroxyphenyltriazine compound represented by general formula (I).SELECTED DRAWING: Figure 1

Description

The present invention relates to a mesh sheet having excellent weather resistance.

Conventionally, at outdoor construction sites such as building construction sites, for the purpose of soundproofing, crime prevention, prevention of scattering of wood chips generated at the construction site, protection of buildings, etc., buildings and construction sites in the middle of work In order to cover the whole, a mesh sheet having transparency and ventilation as in Patent Document 1, for example, has been used. Generally, the construction period is from several months to one year or more, so such mesh sheets at construction sites are always visible to people during the construction period, so they have high design and information display. Function is required.

However, since the mesh sheet used at a construction site or the like as in Patent Document 1 does not have a receiving layer necessary for forming a print layer, for example, a print layer by inkjet printing can be formed with high adhesion. It was not possible, and the weather resistance of the print layer was insufficient, making it unsuitable for applications such as displaying information such as patterns and advertisements.

Therefore, Patent Document 2 proposes an inkjet base cloth made of fibers such as polyester.

Utility Model Registration No. 3140281 Japanese Unexamined Patent Publication No. 2003-201686

Since the inkjet base cloth of Patent Document 2 is suitable for inkjet printing, it has been possible to provide a sheet having a good design.
However, due to the characteristics of the inkjet printing machine, organic pigments are usually used for the inkjet ink. Therefore, when the sheet of Patent Document 2 is used outdoors, the inkjet ink is used for about one year due to ultraviolet rays from the sun or the like. There was a problem that the color faded.

Further, the inkjet base cloth itself has a problem that damage due to ultraviolet rays from the sun or the like is accumulated and the strength of the sheet is lowered.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a mesh sheet having excellent weather resistance when used outdoors for a long time.

［２］前記保護層が、さらに前記基材の第二主面側に設けられている、［１］に記載のメッシュシート。
［３］前記基材の第一主面と前記保護層との間に絵柄層を有する、［１］又は［２］に記載のメッシュシート
［４］前記絵柄層が有機顔料を含む、［３］に記載のメッシュシート
［５］前記基材の第一主面と前記絵柄層との間にプライマー層を有する、［３］又は［４］に記載のメッシュシート。
［６］前記基材が、メッシュ構造を有する織布又は不織布である、［１］〜［５］のいずれかに記載のメッシュシート。
［７］前記基材が、前記メッシュ構造を有する織布又は不織布の第一主面側に、樹脂が含浸又は被覆されており、かつメッシュ構造における開口部を有する、［６］に記載のメッシュシート。
［８］前記基材が、さらに、前記メッシュ構造を有する織布又は不織布の第二主面側及び、メッシュ構造における開口部の側面側に、樹脂が含浸又は被覆されており、かつメッシュ構造における開口部を有する、［７］に記載のメッシュシート。
［９］前記基材の、ＪＩＳ Ａ ８９５２：１９９５に規定される、引張強さ×伸びの値が、４４．１ｋＮ・ｍｍ以上である、［１］〜［８］のいずれかに記載のメッシュシート。 In order to solve the above problems, the present invention provides the following [1] to [9].
[1] A base material having a mesh structure and a protective layer are provided, and the protective layer is provided on the first main surface side of the base material and on the side surface side of an opening in the mesh structure of the base material. Further, a mesh sheet in which the protective layer contains a hydroxyphenyltriazine compound represented by the following general formula (I).

[2] The mesh sheet according to [1], wherein the protective layer is further provided on the second main surface side of the base material.
[3] The mesh sheet according to [1] or [2], which has a pattern layer between the first main surface of the substrate and the protective layer [4] The pattern layer contains an organic pigment, [3] [5] The mesh sheet according to [3] or [4], which has a primer layer between the first main surface of the base material and the pattern layer.
[6] The mesh sheet according to any one of [1] to [5], wherein the base material is a woven fabric or a non-woven fabric having a mesh structure.
[7] The mesh according to [6], wherein the base material is impregnated or coated with a resin on the first main surface side of the woven fabric or the non-woven fabric having the mesh structure, and has an opening in the mesh structure. Sheet.
[8] The base material is further impregnated or coated with a resin on the second main surface side of the woven fabric or non-woven fabric having the mesh structure and the side surface side of the opening in the mesh structure, and the mesh structure has the same structure. The mesh sheet according to [7], which has an opening.
[9] The mesh according to any one of [1] to [8], wherein the value of tensile strength × elongation specified in JIS A 8952: 1995 of the base material is 44.1 kN · mm or more. Sheet.

According to the present invention, it is possible to provide a mesh sheet having excellent weather resistance when used outdoors for a long time.

It is a perspective view which shows one Embodiment of the mesh sheet of this invention. It is a partial cross-sectional view which shows one Embodiment of the mesh sheet of this invention.

<Mesh sheet>
The mesh sheet of the present invention comprises a base material having a mesh structure and a protective layer, and the protective layer is the first main surface side of the base material and the side surface of an opening in the mesh structure of the base material. It is characterized in that the protective layer provided on the side further contains the hydroxyphenyltriazine compound represented by the general formula (I).

FIG. 1 is a perspective view showing a typical embodiment of the mesh sheet 100 and the mesh sheet 200 of the present invention (hereinafter, when both embodiments are collectively described, they are abbreviated as “mesh sheets 100 and 200”). be.

The base material 10 used for the mesh sheets 100 and 200 of FIG. 1 is made of a woven fabric or a non-woven fabric 10a having a mesh structure, and has an actual portion of the net and an opening penetrating from the first main surface 11 to the second main surface 12. 13 is provided. The opening 13 is located between the real parts of the net. The opening 13 has a side surface 14 of the opening that constitutes the opening 13.

The mesh sheets 100 and 200 of FIG. 1 have a protective layer 20 on the first main surface 11 side and the side surface 14 side of the opening of the base material 10. Further, the mesh sheets 100 and 200 of FIG. 1 include an opening 13 and a side surface 14 of the opening, similarly to the base material 10. In particular, in the case of the mesh sheet 200, a pattern layer, a primer layer and the like are further provided between the first main surface of the base material 10 and the protective layer 20, but these are not shown in FIG. 1 (mesh). The layer structure of the sheet 200 will be described in detail in the description of FIG. 2 described later).

Although not shown in FIG. 1, the mesh sheets 100 and 200 may further have a protective layer on the second main surface 12 side. Further, although not shown in FIG. 1, the base material 10 may be a base material having a coating resin on at least the first main surface side of the woven fabric or the non-woven fabric 10a, and further, the second main surface 12 side and the opening. A base material having a coating resin on the side surface 14 side of the above may be used. Further, although not shown in FIG. 1, the mesh sheets 100 and 200 may further have another functional layer between the first main surface of the base material 10 and the protective layer.

The layer structure of the mesh sheet 200 of the present invention will be described in more detail with reference to FIG.
FIG. 2 is a partial cross-sectional view showing a typical embodiment of the mesh sheet 200 of the present invention.
The partial cross-sectional view of FIG. 2 shows a cross-sectional view of a real portion of the net of the mesh sheet of the present invention. It corresponds to the cross section of the real part of the net when cut in a plane parallel to the plane.

The base material 10 used for the mesh sheet 200 of FIG. 2 is a base material in which the first main surface 11, the second main surface 12 and the side surface 14 of the opening of the woven fabric or the non-woven fabric 10a are coated with the coating resin 10b. be. The mesh sheet 200 of FIG. 2 has a primer layer 40 on the first main surface 11 side of the base material 10, a pattern layer on the primer layer 40, and further, the first main surface 11 side. The protective layer 20 is provided on the pattern layer 30 and on the coating resin on the side surface 14 side of the opening.

Although not shown in FIG. 2, the mesh sheet 200 may have a protective layer on the second main surface 12 side. Further, although not shown in FIG. 2, the primer layer 40 may be further provided on the side surface 14 side of the opening, or may be further provided on the second main surface 12 side. Further, although not shown in FIG. 2, the mesh sheet 200 may further have another functional layer.

<Base material>
The base material used for the mesh sheet of the present invention has a mesh structure. Since the base material has a mesh structure, the mesh sheet of the present invention has a mesh structure. If the mesh sheet does not have a mesh structure, the ventilation of the mesh sheet will be insufficient, and the wind will be strongly received when used outdoors. As a result, the mesh sheet will be easily damaged and will be damaged outdoors. Not suitable for use.

Further, as described above, the base material preferably has a filling rate of 0.90 or less, more preferably 0.85 or less, from the viewpoint of parrying the wind and preventing the mesh sheet from being damaged. Further, when the filling rate is 0.90 or less, it is possible to easily prevent the opening from being blocked when the protective layer described later is formed. The solidification rate of the base material is preferably 0.60 or more, more preferably 0.70 or more. When the filling rate of the base material is 0.60 or more, it becomes easy to form the pattern layer described later, and it is possible to easily impart good design to the mesh sheet.
The fulfillment rate represents the ratio of the actual area occupied by the mesh, and is calculated by the following formula.
Enrichment rate = actual area of the net / outer area of the net

The size of the opening of the base material is preferably 0.5 mm or more, more preferably 0.7 mm or more. When the size of the opening is 0.5 mm or more, ventilation is ensured, and it is possible to easily prevent damage to the mesh sheet by parrying the wind. Further, when forming the protective layer described later, it is possible to easily prevent the opening from being blocked. The size of the opening is preferably 10.0 mm or less, more preferably 5.0 mm or less, more preferably 3.5 mm or less, and particularly preferably 2.5 mm or less. When the size of the opening is 10 mm or less, it becomes easy to form the pattern layer described later, and it becomes easy to impart good design to the mesh sheet.
The size of the opening here refers to the mesh size of the mesh sheet specified in JIS A 8952: 1995.

The base material used for the mesh sheet of the present invention is preferably a woven fabric or a non-woven fabric, and particularly preferably a woven fabric. When the base material is a woven fabric or a non-woven fabric, it becomes easy to obtain a mesh sheet that is flexible and easy to handle and has sufficient durability for outdoor use.

As the fibers constituting the woven fabric or the non-woven fabric, fibers composed of synthetic fibers, natural fibers, semi-synthetic fibers, inorganic fibers and mixed fibers composed of two or more of these can be used.
Examples of synthetic fibers include nylon fibers, vinylon fibers, polypropylene fibers, polyethylene fibers and the like. Among these, it is preferable to use polyester fiber from the viewpoint of weight reduction of the mesh sheet and outdoor durability.

Examples of natural fibers include cotton and hemp, and examples of semi-synthetic fibers include rayon and acetate.

Examples of the inorganic fiber include glass fiber, silica fiber, alumina fiber, silica alumina fiber, carbon fiber and the like, and among these, glass fiber is preferably used from the viewpoint of durability and fire resistance of the mesh sheet.

It is preferable that at least the first main surface side of the base material used for the mesh sheet of the present invention is impregnated or coated with a resin. By impregnating or coating with a resin layer, the durability and weather resistance of the mesh sheet can be more easily enhanced. Further, it is preferable that the base material is further coated with a resin on the second main surface side and the side surface side of the opening in the mesh structure.

As the coating resin, a thermoplastic resin can be used, and it is particularly preferable to use a vinyl chloride resin. By using a vinyl chloride resin, the durability and weather resistance of the mesh sheet can be easily improved.

The vinyl chloride resin is a general term that means any of the following forms of resin.
(1) A homopolymer of a vinyl chloride monomer (monomer), that is, polyvinyl chloride in a narrow sense.
(2) Chlorinated polyvinyl chloride.
(3) A vinyl chloride copolymer obtained by copolymerizing a vinyl chloride monomer with another monomer copolymerizable with the vinyl chloride monomer. Examples of the other monomer include vinyl acetate. Examples thereof include ethylene, vinylidene chloride, vinyl fluoride, acrylonitrile, styrene, methyl acrylate, and methyl methacrylate. The copolymerization ratio of the other copolymerizable monomers is preferably 50 mol% or less from the viewpoint of fully expressing the properties peculiar to the vinyl chloride monomer.
(4) A mixture of any two or three of the polyvinyl chloride of (1), the chlorinated polyvinyl chloride of (2), and the vinyl chloride copolymer of (3).
(5) In any one or more of the above-mentioned polyvinyl chloride of (1), the above-mentioned chlorinated polyvinyl chloride of (2), and the above-mentioned vinyl chloride copolymer of (3), or a mixture of (4). , In addition, a mixture of other resins. Here, examples of other resins include acrylic resins, ethylene-vinyl acetate copolymers, styrene-butadiene copolymers, acrylonitrile-butadiene-styrene copolymers, and the like.

If necessary, various additives are added to the various vinyl chloride resins listed in (1) to (5) above. Examples of the additive include a plasticizer, a heat stabilizer, a light stabilizer (radical scavenger, etc.), an ultraviolet absorber (UVA), a surfactant, a colorant, a filler, an antistatic agent, and the like.

As the coating resin, for example, the coating resin can be formed by impregnating or coating the base material with a liquid thermoplastic resin by dipping or coating. Among these, by forming the coating resin by dipping, it is possible to form the coating resin not only on the first main surface side of the base material but also on the second main surface side and the side surface side of the opening, which is preferable. be.

As the liquid thermoplastic resin, an aqueous dispersion form such as an emulsion resin or a dispersion resin, a coating form in which the thermoplastic resin is dissolved in an organic solvent, a paste sol of a vinyl chloride resin, an organosol, a plastisol or the like is used. be able to.

From the viewpoint of the balance between workability and durability when the mesh sheet is installed, the thickness of the base material is preferably 100 μm or more and 2000 μm or less, more preferably 200 μm or more and 1500 μm or less, and further preferably 300 μm or more and 1000 μm or less.

^{The mass of the base material is preferably 100 g / m 2} or more and 1000 g / m ² or less, and 150 g / m ² or more and 800 g / m ² or less, from the viewpoint of the balance between workability and durability when installing the mesh sheet. It is preferable, and ^{more preferably 200 g / m 2} or more and 600 g / m ² or less.

It is preferable that the tensile strength × elongation specified in JIS A 8952: 1995 of the base material is 44.1 kN · mm or more. When the tensile strength x elongation of the base material is 44.1 kN · mm or more, it is possible to easily suppress deformation such as slack due to its own weight and damage due to wind when the mesh sheet is used outdoors.

<Protective layer>
The protective layer in the present invention is, for example, a layer formed to impart durability typified by weather resistance to the surface of a mesh sheet. In addition, the durability required for the protective layer includes stain resistance to various substances such as sludge and scratch resistance.

As described above, the protective layer needs to be formed on the first main surface side and the side surface side of the opening of the base material having the mesh structure.
For example, when a mesh sheet is used for an enclosure at a construction site, the first main surface of the mesh sheet faces the outside of the enclosure. That is, the first main surface of the mesh sheet is a surface exposed to sunlight when used outdoors. In addition, the side surface of the opening is also exposed to sunlight. Therefore, if the protective layer is not formed on the first main surface side and the side surface side of the opening, the base material and the pattern layer described later will be directly affected by ultraviolet rays and the like contained in sunlight, and the weather resistance of the mesh sheet will be affected. Will be low. Further, by forming the protective layer, it is possible to easily improve the scratch resistance of the mesh sheet.

The protective layer is further preferably formed on the second main surface side of the base material. By having a protective layer on the second main surface side of the base material, the influence of sunlight leaking from the first main surface side through the opening and ultraviolet rays contained in the lamp illuminated from the second main surface side is reduced. Therefore, it is possible to further improve the weather resistance of the mesh sheet.

The protective layer in the present invention needs to contain the hydroxyphenyltriazine compound represented by the above general formula (I) as an ultraviolet absorber. If the protective layer does not contain the hydroxyphenyltriazine compound represented by the general formula (I), the mesh sheet in the present invention cannot be imparted with long-term weather resistance.

The reason why the hydroxyphenyltriazine compound represented by the above general formula (I) can impart long-term weather resistance is that the molecule contains a structure such as an ester bond in which the molecular structure is easily changed when used outdoors. It is thought that this is because there is no such thing. Since it does not have a structure such as an ester bond, the molecular structure is less likely to be mutated, bleed-out is easily suppressed, and long-term weather resistance can be imparted.

The content of the hydroxyphenyltriazine compound represented by the general formula (I) contained in the protective layer is preferably 30 parts by mass or less, more preferably 15 parts by mass or less, and 10 parts by mass or less with respect to 100 parts by mass of the resin component. Is even more preferable, and 5 parts by mass or less is even more preferable. When the upper limit of the content of the hydroxyphenyltriazine compound represented by the general formula (I) is 30 parts by mass or less, the hydroxyphenyltriazine compound represented by the general formula (I) is on the outermost surface as in the present invention. Even when it is contained in the protective layer, which is a layer, it becomes easy to prevent bleeding out with time, and it becomes easy to maintain the weather resistance of the mesh sheet for a long period of time. The lower limit of the content of the hydroxyphenyltriazine compound represented by the general formula (I) is not particularly limited as long as it can impart weather resistance to the mesh sheet, but is usually 0.01 part by mass or more with respect to 100 parts by mass of the resin component. It is more preferably 0.1 part by mass or more, further preferably 0.5 part by mass or more, and further preferably 1 part by mass or more.

The protective layer of the mesh sheet of the present invention may contain an ultraviolet absorber other than the hydroxyphenyltriazine compound represented by the above general formula (I) as long as the effect of the present invention is not impaired.
The ratio of the hydroxyphenyltriazine compound represented by the above general formula (I) to the total ultraviolet absorber contained in the protective layer is preferably 80% by mass or more, more preferably 90% by mass or more, and 95% by mass or more. Is even more preferable, 99% by mass or more is even more preferable, and 100% by mass is most preferable.

From the viewpoint of improving scratch resistance, the protective layer preferably contains a cured product of a curable resin composition as a resin component. The ratio of the cured product of the curable resin composition to the total resin components constituting the protective layer is preferably 70% by mass or more, more preferably 90% by mass or more, and 95% by mass or more. It is more preferable to have 100% by mass, and it is particularly preferable to have 100% by mass.

Examples of the curable resin composition include a thermosetting resin composition containing a thermosetting resin, an ionizing radiation curable resin composition containing an ionizing radiation curable resin, and a mixture thereof. Among these, it is preferable to use a thermosetting resin composition from the viewpoint of processability.

The thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that is cured by heating. Examples of the thermosetting resin include acrylic resin, urethane resin, phenol resin, urea melamine resin, epoxy resin, unsaturated polyester resin, and silicone resin. These can be used alone or in combination of two or more. Further, the thermosetting resin composition may be obtained by adding a curing agent such as an isocyanate-based curing agent or an epoxy-based curing agent to these resins. Among these, an acrylic resin is preferable, and an acrylic resin to which an isocyanate curing agent is added is more preferable.

The ionizing radiation curable resin composition is a composition containing a compound having an ionizing radiation curable functional group (hereinafter, also referred to as “ionizing radiation curable compound”). The ionizing radiation curable functional group is a group that is crosslinked and cured by irradiation with ionizing radiation, and preferably includes a functional group having an ethylenic double bond such as a (meth) acryloyl group, a vinyl group, and an allyl group. In addition, in this specification, a (meth) acryloyl group means an acryloyl group or a metachloroyl group. Moreover, in this specification, (meth) acrylate means acrylate or methacrylate.
Further, ionizing radiation means an electromagnetic wave or a charged particle beam having an energy quantum capable of polymerizing or cross-linking a molecule, and usually, ultraviolet rays (UV) or electron beams (EB) are used. Electromagnetic waves such as X-rays and γ-rays, and charged particle rays such as α-rays and ion rays are also included.
Specifically, the ionizing radiation curable compound can be appropriately selected and used from the polymerizable monomers and polymerizable oligomers conventionally used as ionizing radiation curable resins.

As the polymerizable monomer, a (meth) acrylate-based monomer having a radically polymerizable unsaturated group in the molecule is preferable, and a polyfunctional (meth) acrylate monomer is particularly preferable. Here, "(meth) acrylate" means "acrylate or methacrylate".
Examples of the polyfunctional (meth) acrylate monomer include a (meth) acrylate monomer having two or more ionizing radiation-curable functional groups in the molecule and having at least a (meth) acryloyl group as the functional group.
From the viewpoint of improving processing characteristics, scratch resistance and weather resistance, the number of functional groups of the polyfunctional (meth) acrylate monomer is preferably 2 or more and 8 or less, more preferably 2 or more and 6 or less, and further preferably 2 or more and 4 or less. More preferably 2 or more and 3 or less. These polyfunctional (meth) acrylates may be used alone or in combination of two or more.

Examples of the polymerizable oligomer include a (meth) acrylate oligomer having two or more ionizing radiation-curable functional groups in the molecule and having at least a (meth) acryloyl group as the functional group. For example, urethane (meth) acrylate oligomer, epoxy (meth) acrylate oligomer, polyester (meth) acrylate oligomer, polyether (meth) acrylate oligomer, polycarbonate (meth) acrylate oligomer, acrylic (meth) acrylate oligomer and the like can be mentioned.
Further, as the polymerizable oligomer, a highly hydrophobic polybutadiene (meth) acrylate-based oligomer having a (meth) acrylate group in the side chain of the polybutadiene oligomer, and a silicone (meth) acrylate-based oligomer having a polysiloxane bond in the main chain. In molecules such as aminoplast resin (meth) acrylate-based oligomers modified from aminoplast resins having many reactive groups in small molecules, novolak type epoxy resins, bisphenol type epoxy resins, aliphatic vinyl ethers, aromatic vinyl ethers, etc. There are oligomers and the like having cationically polymerizable functional groups.

These polymerizable oligomers may be used alone or in combination of two or more. From the viewpoint of improving processing properties, scratch resistance and weather resistance, urethane (meth) acrylate oligomer, epoxy (meth) acrylate oligomer, polyester (meth) acrylate oligomer, polyether (meth) acrylate oligomer, polycarbonate (meth) acrylate. One or more selected from oligomers and acrylic (meth) acrylate oligomers is preferable, one or more selected from urethane (meth) acrylate oligomers and polycarbonate (meth) acrylate oligomers is more preferable, and urethane (meth) acrylate oligomers are even more preferable. ..

The number of functional groups of these polymerizable oligomers is preferably 2 or more and 8 or less, more preferably 6 or less, still more preferably 4 or less, from the viewpoint of improving processing characteristics, scratch resistance and weather resistance. 3 or less is even more preferable.
The weight average molecular weight of these polymerizable oligomers is preferably 2,500 or more and 7,500 or less, and more preferably 3,000 or more and 7,000 or less, from the viewpoint of improving processing characteristics, scratch resistance and weather resistance. , 3,500 or more and 6,000 or less are more preferable. As used herein, the weight average molecular weight is the average molecular weight measured by GPC analysis and converted to standard polystyrene.

A monofunctional (meth) acrylate can be used in combination with the ionizing radiation curable resin composition for the purpose of reducing the viscosity of the ionizing radiation curable resin composition. These monofunctional (meth) acrylates may be used alone or in combination of two or more.

When the ionizing radiation curable compound is an ultraviolet curable compound, it is preferable to include additives such as a photopolymerization initiator and a photopolymerization accelerator.
Examples of the photopolymerization initiator include one or more selected from acetophenone, benzophenone, α-hydroxyalkylphenone, Michler ketone, benzoin, benzyl dimethyl ketal, benzoyl benzoate, α-acyl oxime ester, acylphosphine oxide, thioxanthones and the like. Be done.
Further, the photopolymerization accelerator can reduce the polymerization inhibition by air at the time of curing and accelerate the curing rate. For example, from p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester and the like. One or more selected species can be mentioned.

The protective layer may contain other additives, if necessary, as long as the effects of the present invention are not impaired. As other additives, for example, it is preferable to use an antioxidant, a light stabilizer and the like.

The thickness of the protective layer is preferably 1.5 μm or more and 30 μm or less, more preferably 2 μm or more and 20 μm or less, and further preferably 3 μm or more and 15 μm or less from the viewpoint of the balance between processing characteristics, scratch resistance and weather resistance.

Examples of the method for forming the protective layer include a method of applying a coating liquid for forming a protective layer to a base material and coating the base material, and a method of dipping the base material into a coating liquid for forming a protective layer to form the protective layer. It is preferable to form. By forming the protective layer by dipping, it is easy to form the protective layer not only on the first main surface side of the base material but also on the side surface side and the second main surface side of the opening, so that the weather resistance of the mesh sheet is improved. It can be done easily.

<Pattern layer>
In the present invention, the pattern layer is, for example, a layer formed to impart designability to a mesh sheet. The pattern layer is preferably formed between the first main surface of the base material and the protective layer from the viewpoint of displaying a design such as an advertisement and enhancing the weather resistance of the pattern layer.

Examples of the pattern of the pattern layer include wood grain pattern, stone grain pattern, cloth grain pattern, leather pattern pattern, geometric pattern, character, symbol, line drawing, various abstract pattern patterns, single color solid pattern, and single color gradation. , These may be combined.

The pattern layer is a known method such as a printing method such as an offset printing method, a flexographic printing method, a gravure printing method, a screen printing method, a spray printing method and an inkjet printing method, and a transfer method for transferring a printed pattern. Can be formed by

The pattern layer in the present invention is particularly preferably a layer formed by an inkjet printing method from the viewpoint of enabling multicolor and high-definition printing and obtaining a mesh sheet having high designability. However, multicolor and high-definition printing for obtaining a mesh sheet having high designability is not limited to the inkjet printing method from the viewpoint only, and may be, for example, a gravure printing method. However, in the gravure printing method, it is necessary to prepare a plate cylinder for each type and ink color, and when switching types, it is necessary to replace the plate cylinder in the printing machine, and it is necessary to adjust the thickness for each ink color. It is not suitable for small-lot, high-mix production. Also in the offset printing method, it is necessary to prepare an original plate called a PS plate for each color (Y (yellow), M (magenta), C (cyan), K (black)). Like the gravure printing method, it is not suitable for small-lot, high-mix production, as the PS plate needs to be replaced.

On the other hand, by forming the pattern layer of the present invention by an inkjet printing method, it is not necessary to prepare a plate cylinder (or PS plate), and the plate cylinder (or PS plate) is replaced in the printing machine when switching types. No work is required. Furthermore, in color tone adjustment, there is no need for heavy-duty work such as meat adjustment work in the gravure printing method or re-production of the PS plate in the offset printing method, and only adjustment of the image data to be transmitted to the inkjet printing machine is required. It is possible to match the color tones of the faded pattern layer. That is, the inkjet printing method is a printing method suitable for the production of a large number of small quantities because the workload at the time of switching the product types and the preparation thereof is low. Therefore, the mesh sheet of the present invention can be suitably applied in the case of producing a wide variety of products in small quantities, or in the small-quantity production in which only the damaged portion is replaced with a mesh sheet whose color is matched to the color tone of the surrounding pattern layer.

The pattern layer is preferably a layer formed by an inkjet printing method using an ultraviolet curable ink. By using the ultraviolet curable ink, the ink after ejection can be instantly cured by the ultraviolet light source mounted on the print head portion, so that the ink can be easily thickened and a wider range of color tones can be expressed easily. Further, since it is not necessary to apply heat during curing (drying), the base material is less damaged by heat, and the curing (drying) time can be easily shortened. In addition, solvent-based inks generally have high gloss, but UV-curable inks can be adjusted from low gloss to high gloss similar to solvent-based inks according to preference, and can be used for mesh sheets. It becomes easy to give high design.

As the ultraviolet curable ink used for forming the pattern layer, a photopolymerization type is generally used, and mainly photopolymerizable oligomers, photopolymerization monomers, photopolymerization initiators, colorants composed of organic or inorganic pigments, etc. are used. Composition. In such an ultraviolet curable ink, radicals are generated from the photopolymerization initiator by ultraviolet irradiation to attack and activate reactive monomers and oligomers. After that, the activated reactive monomers and oligomers react with each other to be polymerized, which facilitates fixation on the above-mentioned base material and the above-mentioned primer layer.

The ultraviolet curable ink preferably contains an ionizing radiation curable resin composition, and particularly preferably contains an ultraviolet curable resin composition. As the ionizing radiation curable resin composition contained in the ultraviolet curable ink, the ionizing radiation curable resin composition exemplified in the above-mentioned protective layer can be used. Among these, it is preferable to use urethane (meth) acrylate oligomer as the polymerizable oligomer contained in the ionizing radiation curable resin composition.

Pigments contained in UV curable ink include carbon black (black), iron black, titanium white, antimony white, yellow lead, titanium yellow, petals, cadmium red, ultramarine blue, cobalt blue and other inorganic pigments, and quinacridone red. , Isoindolinone yellow, phthalocyanine blue and other organic pigments. Among these, it is preferable that an organic pigment is contained from the viewpoint of being suitable for an inkjet printing method and enabling multicolor and high-definition printing.

In general, organic pigments tend to be inferior in weather resistance, so that the pattern layer containing the organic pigment has low weather resistance and cannot withstand long-term outdoor use.
However, since the mesh sheet of the present invention has a protective layer containing the hydroxyphenyltriazine compound represented by the above general formula (I) as described above, it is possible to improve the weather resistance even when the pattern layer contains an organic pigment. This makes it possible to withstand long-term outdoor use.

The thickness of the pattern layer may be appropriately selected according to the desired pattern, but from the viewpoint of hiding the background color of the base material and improving the design, it is preferably 0.5 μm or more and 30 μm or less, and 1 μm or more and 20 μm or less. Is more preferable, and 2 μm or more and 10 μm or less is further preferable.

<Primer layer>
The primer layer of the present invention is preferably formed between the first main surface of the base material and the pattern layer. By being formed between the first main surface of the base material and the pattern layer, the adhesion between the base material and the pattern layer can be easily enhanced, and the weather resistance and durability of the mesh sheet can be further enhanced.

Further, the primer layer may be further formed on the second main surface side of the base material and the side surface side of the opening. By being formed on the second main surface side of the base material and the side surface side of the opening, it is easy to improve the adhesion between the above-mentioned protective layer and the base material, and it is possible to further improve the durability and weather resistance of the mesh sheet. ..

The primer layer preferably contains a cured product of the curable resin composition from the viewpoint of processability and adhesion to the pattern layer.

As the cured product of the curable resin composition contained in the primer layer, the cured product of the curable resin composition exemplified in the above-mentioned protective layer can be used. Among them, from the viewpoint of adhesion to the pattern layer, it is preferable to include a cured product of the thermosetting resin composition, and among these, a cured product of the thermosetting resin composition containing an acrylic resin is preferable, and acrylic. A cured product of a thermosetting resin composition obtained by cross-curing a resin with an isocyanate curing agent is more preferable.

The thickness of the primer layer is preferably 1 μm or more and 10 μm or less, more preferably 2 μm or more and 8 μm or less, and further preferably 3 μm or more and 6 μm or less from the viewpoint of processability and adhesion to the pattern layer.

<Manufacturing method of mesh sheet>
The method for producing a mesh sheet of the present invention includes at least a step of forming a protective layer on a base material having a mesh structure.

(Protective layer forming process)
The protective layer forming step is a step of forming a protective layer on the first main surface side of the base material having the mesh structure and on the side surface side of the opening in the mesh structure. As a method for forming the protective layer, for example, it can be formed by dipping the base material into the coating liquid for forming the protective layer, as described above. By forming the protective layer by dipping, it is easy to form the protective layer not only on the first main surface side of the base material but also on the side surface side and the second main surface side of the opening, so that the weather resistance of the mesh sheet is further improved. It can be easily raised. The protective layer may be further formed on the second main surface side of the base material.

(Pattern layer forming process)
In the method for producing a mesh sheet of the present invention, a pattern layer forming step may be further included before the protective layer forming step described above. The pattern layer forming step is a step of forming a pattern layer between the first main surface of the base material and the protective layer. As a method for forming the pattern layer, a known printing method can be used, and among them, it is preferably formed by an inkjet printing method. By forming the pattern layer by the inkjet printing method, as described above, it is possible to perform multicolor and higher definition printing, and it is possible to easily impart high design to the mesh sheet. Further, it is suitable for easy application in the case of producing a large number of varieties little by little, or in the case of small-quantity production in which only the damaged part is replaced with a mesh sheet that matches the color tone of the surrounding pattern layer that has faded.

(Primer layer forming step)
In the method for producing a mesh sheet of the present invention, a primer layer forming step may be further included before the pattern layer forming step described above. The primer layer forming step is a step of forming a primer layer between the first main surface of the base material and the pattern layer. As a method for forming the primer layer, a known coating method can be used, and for example, the substrate can be formed by impregnating or coating the substrate with a coating liquid for forming a primer layer by dipping. The primer layer may be further formed on the second main surface side of the base material and on the side surface side of the opening in the mesh structure.

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. The present invention is not limited to the embodiments described in the examples.

1. 1. Measurement and evaluation 1-1. Weather resistance (embrittlement start time)
The mesh sheets obtained in Examples and Comparative Examples were subjected to an accelerated weather resistance test using a metal halide lamp (MWOM) (a step of irradiating ultraviolet rays for 20 hours under the following irradiation conditions and then dew condensation under the following dew condensation conditions for 4 hours. As one cycle, a test in which the cycle was repeated) was carried out. The time when the weather resistance test was carried out and embrittlement due to fading was confirmed was defined as the embrittlement start time in the mesh sheets of the examples and comparative examples. The evaluation results are summarized in Table 1. If the embrittlement start time is 1500 hours or more, it can be judged that the embrittlement has excellent weather resistance. The test equipment, irradiation conditions, and dew condensation conditions for the accelerated weather resistance test are as follows.

<Test equipment>
Made by Daipla Wintes, trade name "Daipla Metal Weather"
<Irradiation conditions>
Illuminance: 65mW / cm ² , Black panel temperature: 63 ° C, Humidity in tank: 50% RH, Time: 20 hours <Condensation conditions>
Illuminance: 0 mW / cm ² , humidity in the tank: 98% RH, time: 4 hours

1-3. Bleed-out resistance The suction cup adhesive decorative sheets obtained in Examples and Comparative Examples were left in an environment with a temperature of 40 ° C. and a humidity of 90% RH for 1 week. The appearance of the suction cup adhesive sheet after being left to stand was visually observed from the protective layer side and evaluated according to the following criteria. The evaluation results are summarized in Table 1.
<Evaluation criteria>
A: No change in appearance was confirmed.
C: Appearance changes due to whitening, gloss change, precipitation of mesh sheet components, etc. were confirmed.

2. Fabrication of mesh sheet [Example 1]
A woven fabric having a mesh structure made of polyethylene fibers, the first main surface side, the side surface side of the opening, and the second main surface side of the base material A coated with polyvinyl chloride (mass 430 g / m ² , Hiraoka weaving dyeing). Inkjet printer (manufactured by EFI, trade name "VUTEk GS5500LXrpro", ink used: EFI VUTEk GSLXr 3M SuperFlex UV ink (ultraviolet curable type)) on the first main surface side of the product name "Admax SJM-1034FD" manufactured by the company. ) Was used to form a pattern layer having a thickness of 8 μm by inkjet printing.

Next, the coating liquid for forming a protective layer of the following formulation is applied to the base material on which the pattern layer is formed by dipping and then dried, and the thickness after drying is 5 μm on the pattern layer (first main base material). A protective layer was formed on the surface side), the side surface side of the opening, and the second main surface side to obtain the mesh sheet of Example 1.
<Coating liquid for forming a protective layer>
-Thermosetting resin (two-component curable acrylic-urethane resin) 100 parts by mass-Ultraviolet absorber (UVA1) 5 parts by mass (UVA1 represents a hydroxyphenyltriazine compound represented by the above general formula (I). )

[Example 2]
A mesh sheet of Example 2 was obtained in the same manner as in Example 1 except that the content of the ultraviolet absorber (UVA1) was changed to 21 parts by mass.

[Example 3]
^{Base material B (mass 470 g / m 2} , mass 470 g / m 2, Hiraoka Orizome Co., Ltd.) in which the first main surface side, the side surface side of the opening, and the second main surface side of a woven fabric having a mesh structure made of polyethylene fibers are coated with polyvinyl chloride. A thermosetting acrylic resin was applied and dried on the first main surface side of the trade name "Tarposcreen # 1003 (white)"), and a primer layer was formed so that the thickness after drying was 3 μm. ..

Next, on the primer layer, a pattern layer having a thickness of 3 μm was printed by inkjet printing using an inkjet printer (manufactured by EFI, trade name “VUTEk GS5500LXrpro”, ink used: EFI VUTEk GSLXr 3M SuperFlex UV ink (ultraviolet curable type)). Formed.

Next, the coating liquid for forming the protective layer of the above formulation is applied to the base material on which the pattern layer is formed by dipping and then dried, and the thickness after drying is 5 μm on the pattern layer (first main base material). A protective layer was formed on the surface side), the side surface side of the opening, and the second main surface side to obtain the mesh sheet of Example 3.

[Comparative Example 1]
A mesh sheet of Comparative Example 1 was obtained in the same manner as in Example 1 except that the ultraviolet absorber was changed to UVA2.
UVA2 represents a hydroxyphenyltriazine compound represented by the following general formula (II).

[Comparative Example 2]
A mesh sheet of Comparative Example 2 was obtained in the same manner as in Comparative Example 1 except that the content of the ultraviolet absorber (UVA2) was changed to 35 parts by mass.

[Comparative Example 3]
A mesh sheet of Comparative Example 3 was obtained in the same manner as in Example 1 except that the ultraviolet absorber was changed to UVA3.
UVA3 represents a hydroxyphenyltriazine compound represented by the following general formula (III).

[Comparative Example 4]
A mesh sheet of Comparative Example 4 was obtained in the same manner as in Comparative Example 3 except that the content of the ultraviolet absorber (UVA3) was changed to 35 parts by mass.

[Comparative Example 5]
A mesh sheet of Comparative Example 5 was obtained in the same manner as in Example 1 except that the protective layer was not formed.

From the results in Table 1, since the mesh sheets of Examples 1 to 3 can prolong the embrittlement start time and have excellent bleed-out resistance, they have excellent weather resistance when used outdoors for a long time. Can be confirmed to have.
Since Comparative Examples 1 to 4 used an ultraviolet absorber different from that of Examples 1 to 3, the result was that the weather resistance was inferior. In particular, the protective layers of Comparative Examples 2 and 4 were inferior in weather resistance to Examples 1 to 3 even though they contained more ultraviolet absorbers than Examples 1 to 3. Further, in Comparative Examples 2 and 4, the bleed-out resistance was inferior due to the increase in the content of the ultraviolet absorber.
In Comparative Example 5, since the configuration did not have a protective layer in the first place, the weather resistance was significantly inferior to that of the other configurations.

Since the mesh sheet of the present invention has excellent weather resistance when used outdoors for a long time, it is a mesh sheet used in an environment exposed to direct sunlight such as an exterior, a façade, an outdoor advertising signboard, etc. at a construction site. It is preferably used as.
For example, when it is used as a mesh sheet for the exterior of a construction site (outdoor side of a building) such as a so-called temporary enclosure, it covers at least the part that is the target of the purpose of use such as soundproofing, shatterproofing, and building protection. If possible, the peripheral and adjacent parts other than the minimum target part for the purpose of use may be covered as needed. Depending on the purpose of use and the object of use, the entire outside of the building including the roof of the building, the surrounding wall surface, etc. may be covered with the mesh sheet of the present invention. In addition to buildings, various vehicles such as automobiles and railroad vehicles, vehicles existing outdoors such as ships and aircraft; and various materials installed, stored, accumulated, or stocked outdoors such as building materials are protected. Or covering material for classification; insect nets and bird nets that prevent birds and insects from invading orchards, houses, power transmission and distribution facilities, etc .; can also be used as military or civilian camouflage nets, etc. can.

10 Base material 10a Woven fabric or non-woven fabric 10b Coating resin 11 First main surface (side)
12 Second main surface (side)
13 Opening 14 Side (side) of the opening
20 Protective layer 30 Picture layer 40 Primer layer 100, 200 Mesh sheet

Claims (9)

It has a base material with a mesh structure and a protective layer.
The protective layer is provided on the first main surface side of the base material and on the side surface side of the opening in the mesh structure of the base material.
A mesh sheet in which the protective layer further contains a hydroxyphenyltriazine compound represented by the following general formula (I).

The mesh sheet according to claim 1, wherein the protective layer is further provided on the second main surface side of the base material. The mesh sheet according to claim 1 or 2, which has a pattern layer between the first main surface of the base material and the protective layer. The mesh sheet according to claim 3, wherein the pattern layer contains an organic pigment. The mesh sheet according to claim 3 or 4, which has a primer layer between the first main surface of the base material and the pattern layer. The mesh sheet according to any one of claims 1 to 5, wherein the base material is a woven fabric or a non-woven fabric having a mesh structure. The mesh sheet according to claim 6, wherein the base material is impregnated or coated with a resin on the first main surface side of the woven fabric or the non-woven fabric having the mesh structure, and has an opening in the mesh structure. The base material is further impregnated or coated with resin on the second main surface side of the woven fabric or non-woven fabric having the mesh structure and the side surface side of the opening in the mesh structure, and the opening in the mesh structure is formed. The mesh sheet according to claim 7. The mesh sheet according to any one of claims 1 to 8, wherein the value of tensile strength × elongation specified in JIS A 8952: 1995 of the base material is 44.1 kN · mm or more.

Images