JP2008174988A - Fence member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fence member superior in anticorrosiveness, and hardly cut by a cutter. <P>SOLUTION: This fence member 10 is composed of a bar-shaped core material 11 composed of a fiber reinforced resin hardened material impregnated with a matrix resin composition with reinforced fiber including hardly cutting fiber, and a surface layer 12 having nonwoven fabric. The surface layer 12 is composed of the hardened material hardened by being impregnated with a part of the matrix resin composition included in a fiber reinforced resin constituting of the core material 11 and the nonwoven fabric. The core material 11 and the surface layer 12 are integrated by the hardened material of the matrix resin composition of continuously existing both. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fence member.

  For example, in an outdoor facility such as an airfield, a protective fence is provided around the facility in order to prevent entry into the facility. Such a fence has such a height that it cannot be easily climbed over, and a pointed member called “reverse” may be provided on the upper part.

Patent Document 1 listed below as a conventional fence member describes a non-metallic fence in which a plastic net is stretched on a fiber reinforced plastic frame member. Patent Document 1 does not describe a material of fiber reinforced plastic.
As an airport protective fence, a fence made of a glass fiber reinforced plastic (product name: Plaalloy, manufactured by Asahi Glass Matex Co., Ltd.) is known.
JP 2000-192694 A

The demand for measures to prevent entry into airfields is increasing year by year, and it is required to develop protective fences that are difficult to cut, assuming that the fences are cut using a blade that can be easily concealed, such as a saw. Yes.
A protective fence made of glass fiber reinforced plastic has higher corrosion resistance than a metal fence, but is insufficient in performance of preventing cutting with a blade.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a fence member that has good corrosion resistance and is not easily cut by a blade.

  In order to solve the above-mentioned problem, the fence member of the present invention is formed by using a fiber reinforced resin impregnated with a matrix resin composition in a reinforcing fiber including a hard-cut fiber having a hard-to-cut property. .

  According to the present invention, it is possible to obtain a fence member that has good corrosion resistance and weather resistance and is difficult to be cut by a blade.

FIG. 1 is a perspective view showing an example of a protective fence provided around an airfield, for example. In the figure, reference numeral 1 is a support, 2 is a trunk edge, and 3 is a lattice. The upper part of the support column 1 is bent to form an inclined portion 1a, and a stencil line 4 is stretched so as to bridge between the inclined portions 1a of the adjacent support columns.
Since the fiber reinforced resin according to the present invention has a characteristic that it is difficult to be cut with a blade, it is suitable for an exposed member among the fence members constituting the fence, and is particularly a member that is easily cut when entering. It is more preferable to apply to.
In the example of FIG. 1, the support column 1, the trunk edge 2, and the lattice 3 are preferably applied as a fence member in the present invention, and the present invention is preferably applied to at least the lattice 3.
The shapes and dimensions of the support column 1, the trunk edge 2, and the lattice 3 can be set as appropriate according to the application. For example, in the case of a protective fence surrounding an airfield, the shapes of the support column 1, the trunk edge 2, and the lattice 3 are not particularly limited, but a round bar shape is preferable. Although the thickness is not particularly limited, the diameter of the support column 1 is preferably 50 to 130 mm, the diameter of the trunk edge 2 is 10 to 50 mm, and the diameter of the lattice 3 is preferably 5 to 25 mm.

FIG. 2 is a sectional view showing an embodiment of the fence member of the present invention. The fence member 10 according to the present embodiment includes a rod-shaped core 11 made of a cured fiber reinforced resin obtained by impregnating a matrix fiber composition with reinforcing fibers including difficult-to-cut fibers, and a surface layer 12 including a nonwoven fabric. ing. The surface layer 12 is made of a cured product obtained by impregnating a non-woven fabric with a part of the matrix resin composition contained in the fiber reinforced resin constituting the core material 11. That is, the core material 11 and the surface layer 12 are integrated by a cured product of the matrix resin composition that exists continuously across the both.
However, the surface layer 12 for improving the surface property is not essential. The material of the nonwoven fabric is not particularly limited. The basis weight of the nonwoven fabric is not particularly limited, but 20 to 140 g / m ² is preferable.

<Fiber reinforced resin>
The fiber reinforced resin constituting the core material 11 is obtained by impregnating a reinforcing fiber with a matrix resin composition. That is, the core material 11 consists of the hardened | cured material and reinforcement fiber of a matrix resin composition.
[Reinforcing fiber]
(Hard-cut fiber)
The reinforcing fibers constituting the fiber reinforced resin include difficult-to-cut fibers having difficult-to-cut properties. The hard-to-cut fibers in the present invention are fibers other than glass fibers and have properties that are difficult to cut with a blade. Specifically, a fiber having high toughness is used. Here, toughness refers to the tenacity of the material, and in order to express toughness quantitatively, the value of “total strain energy” corresponding to the area surrounded by the breaking point in the fiber stress-strain line curve is used. Yes (reference: FRP glossary, reinforced plastics association, 1983, p. 76). The larger the “total strain energy” value, the higher the toughness and the harder to cut. Specifically, the hard-cut fiber has a total strain energy per unit area and unit length of preferably 5 N · mm or more, more preferably 10 N · mm, and even more preferably 15 N · mm or more.

(How to obtain strain energy)
For example, in a stress-strain line curve obtained by a tensile test as shown in FIG. 3, the area (total strain energy) surrounded up to the breaking point is calculated by an integration method. In FIG. 3, the vertical axis represents stress (unit: N / mm ² ), and the horizontal axis represents strain (ε, unit is dimensionless). For example, in a 1 mm ² test piece, when the elongation (strain) is 4 [%] and the stress at that time is 1000 [N / mm ² ], the test piece is extended by 0.04 mm. Therefore, the strain energy at the elongation (strain) of 4 [%] is 1000 [N] × 0.04 [mm] = 40 [N · mm].
In FIG. 3, the total strain energy (U) is a stress-strain line curve represented by Y = F (x) and a straight line represented by X = ε _MAX (ε _MAX is the strain value at the breaking point). , Which corresponds to the area surrounded by the horizontal axis (indicated by the hatched portion in the figure), and is obtained by the following mathematical formula (1).

Specific examples of the difficult-to-cut fibers include aramid fibers, polyethylene fibers, polyester fibers, polyparaphenylene benzobisoxazole fibers (PBO fibers), polyvinyl alcohol fibers (PVA fibers), and metal fibers. Hardly cut fibers may be used alone or in combination of two or more.
Among the above, aramid fibers and metal fibers are particularly preferable from the viewpoint of cutting strength. Specific examples of the metal fiber include copper wire, aluminum wire, steel wire (including piano wire) and the like.
From the viewpoint of hardly causing radio interference, one or more non-metallic fibers selected from aramid fibers, polyethylene fibers, polyester fibers, polyparaphenylene benzobisoxazole fibers and polyvinyl alcohol fibers are preferable.

The hard-to-cut fibers are continuous fibers (long fibers), short fibers, or cloth materials, and are arranged so that the hard-cut fibers are present in the entire length of the core material 11. The thickness of the difficult-to-cut fiber is not particularly limited as long as the desired cut-resistant strength can be obtained. However, in consideration of manufacturability and cost, the fineness of the non-metallic fiber is preferably about 5 to 15000 tex. In the case of metal fibers, the wire diameter is preferably about 0.1 to 4 mm.
In addition, the nonwoven fabric which is the form in which the monofilament was entangled is not contained in the reinforcing fiber in this invention.

(Glass fiber)
In addition to the above-mentioned hard-to-cut fibers, the reinforcing fibers may include glass fibers. The glass fiber may be either a short fiber or a long fiber. Glass fibers include yarns made of E-glass fibers, S-glass fibers, alkali-resistant glass fibers, rovings, roving cloths, knit fabrics, blinds, CSM (continuous strand mats), CM (chopped strands). -Mat), knit mat, and strand are more preferable. The filament diameter of the glass fiber is preferably 6 to 35 μm (preferably 11 to 27 μm), and the strand count of 100 to 10,000 tex.

The ratio of difficult-to-cut fibers to the entire reinforcing fibers contained in the fiber reinforced resin is determined within a range in which the required cut resistance can be achieved. When the difficult-to-cut fiber is a non-metallic fiber, the volume is preferably 5% by volume or more, more preferably 10% by volume or more, and further preferably 25% by volume or more. When the hard-to-cut fiber is a metal fiber, 0.2% by volume or more is preferable, 0.8% by volume or more is more preferable, and 1.3% by volume or more is more preferable. In any case, good cutting resistance of the fence member can be obtained by setting the above lower limit value or more.
Cutting resistance improves as the proportion of hard-cutting fibers in the entire reinforcing fiber increases. The upper limit of the ratio of the difficult-to-cut fibers may be 100% by volume, but from the viewpoint of cost reduction, it is preferable to reduce the ratio of the difficult-to-cut fibers as long as the required cutting resistance can be achieved. For example, the ratio of the hard-cut fiber is preferably 95% by volume or less, more preferably 70% by volume or less, and further preferably 60% by volume or less.

[Matrix resin composition]
The matrix resin composition contains a matrix resin as a main component and other additives as necessary.
As the matrix resin, any of a thermosetting resin and a thermoplastic resin can be used and is not particularly limited. For example, thermosetting resins such as epoxy resin, unsaturated polyester resin, vinyl ester resin, phenol resin, urethane acrylate, polyester acrylate, diallyl phthalate; heat such as nylon resin, polyether ketone resin, polyphenyl sulfone resin, polyimide resin A plastic resin is mentioned. These resins may be used alone or in combination of two or more. Among these, thermosetting resins such as unsaturated polyester resins, vinyl ester resins, and epoxy resins are preferable.
Known additives can be appropriately used as additives to be added to the matrix resin composition. Specific examples include fillers, curing agents, mold release agents, colorants and the like.

  30-80 volume% is preferable, as for the content rate of the reinforcing fiber in the fiber reinforced resin (100 volume%) which concerns on this invention, 40-70 volume% is more preferable, and 45-65 volume% is further more preferable. By setting the content of the reinforcing fiber to be equal to or higher than the lower limit of the above range, good tensile strength and bending strength in the fence member can be obtained. By setting it to the upper limit of the above range or less, the quantitative balance between the reinforcing fiber and the matrix resin composition is improved, and good moldability, tensile strength and bending strength can be obtained.

[Production method]
The method for producing a fence member by curing the fiber reinforced resin according to the present invention includes a step of impregnating a matrix resin composition into a reinforcing fiber, molding the matrix resin composition into a desired shape, and curing the matrix resin composition. Can be manufactured. Specific molding methods include hand lay-up molding, resin injection molding, filament winding molding, pultrusion molding, press molding, extrusion molding, injection molding, infusion molding, and sheet winding molding. Etc. Among these, the filament winding molding method, the sheet winding molding method, and the pultrusion molding method are preferable from the viewpoint of good productivity, and the pultrusion molding method is particularly preferable from the viewpoint of continuous molding.

When manufacturing by a pultrusion molding method, specifically, these fibers are impregnated with the matrix resin composition by passing through the matrix resin composition while pulling the hard-cut fibers and the glass fibers at a predetermined speed. Subsequently, the difficult-to-cut fibers and glass fibers impregnated with the matrix resin composition are introduced into a heat-molding mold together with the nonwoven fabric, and the matrix resin is cured while passing through the mold. At this time, in the cross section perpendicular to the traveling direction in the thermoforming mold, the guide is placed so that the periphery of the reinforcing fibers (hardly cut fibers and glass fibers) impregnated with the matrix resin composition is surrounded by the nonwoven fabric. Used to guide the reinforcing fiber and the non-woven fabric into the heating mold.
In the thermoforming mold, the matrix resin composition is cured in a state where the matrix resin composition is also impregnated into the nonwoven fabric to form a long cured product. The cured product is continuously pulled out by a pulling device. The obtained long cured product is cut into a fence member.

The fence member 10 according to the present embodiment includes a core material 11 that is cured after impregnating the reinforcing fiber with the matrix resin composition, and a surface layer 12 that is cured after impregnating the nonwoven fabric with the matrix resin composition. Therefore, it is excellent in corrosion resistance compared with a metal fence member. Moreover, since the reinforcing fiber which comprises the core material 11 contains a difficult-to-cut fiber, it is hard to be cut | disconnected with a blade. For example, it has better cutting resistance than a conventional fence member made of glass fiber reinforced plastic. Preferably, it is possible to realize a fence member in which the time required for cutting with a saw is twice or more as compared with a conventional fence member made of glass fiber reinforced plastic. Therefore, it is possible to provide a high-performance protective fence that is excellent in corrosion resistance and can prevent cutting with a blade.
In particular, when non-metallic fibers such as aramid fibers are used as hard-to-cut fibers, radio interference is unlikely to occur, and therefore, it is suitable for a protective fence provided around an airfield.

Hereinafter, the present invention will be described in more detail using examples, but the present invention is not limited to these examples.
[Formulation Example 1: Formulation of matrix resin composition]
100 parts by mass of unsaturated polyester resin (manufactured by Iupika Japan, product name 7596), 25 parts by mass of calcium carbonate (manufactured by Nichez, product name: NA1200) as a filler, and BPO (benzoyl peroxide) (Nippon Yushi) as a curing agent 3 parts by mass, product name: Niper NS, purity 40% by mass) and 0.8 parts by mass of bis-peroxy-dicabonate (manufactured by Kayaku Akzo, product name: Parkadox 16), and phosphoric acid as a release agent A matrix resin composition was prepared by mixing 0.5 parts by mass of ester (product name: PS-125, manufactured by Accel Corporation).

[Reinforcing fiber]
Aramid long fibers (manufactured by Du Pont, Toray, product name: kevra49, fineness 800 tex) and piano wire (manufactured by Suzuki Metal Industries, wire diameter 1 mm, type: SWP-A, steel type: SWRS 82A Steel number: D60337) was prepared. Glass fibers (manufactured by OWENS CORNING, product name: R2220 TMF 08, fineness 2200 tex, long fibers) were prepared as other reinforcing fibers. The strain energy per unit area and unit length is about 36 [N · mm] for aramid fibers, about 28 [N · mm] for piano wires, and about 14 [N · mm] for glass fibers.

[Nonwoven fabric]
A nonwoven fabric made of polyester (manufactured by Du Pont, product name: 8010H, basis weight 44 g / m ² ) was prepared.

(Example 1)
A round bar-shaped fence member (lattice) having the configuration shown in FIG. 2 was manufactured by a drawing method. The reinforcing fibers were long fibers (continuous fibers) and were arranged so as to be parallel to the length direction of the fence member. The outer diameter of the fence member (lattice) was 8 mm including the surface layer.
20 glass fibers and 14 aramid fibers were used as reinforcing fibers. The proportion of glass fibers in the entire reinforcing fiber is 69% by volume, and the proportion of aramid fibers is 31% by volume.
First, the reinforcing fiber was impregnated with the matrix resin composition of Formulation Example 1 to obtain a fiber reinforced resin having a reinforcing fiber content (total of glass fiber and aramid fiber) of 50% by volume.
Next, a mold having a through-hole with an inner diameter of 8 mm is preliminarily set at a temperature of 130 ° C., and the matrix resin composition is cured while passing the fiber reinforced resin and the nonwoven fabric through the mold. Was drawn at a drawing speed of 50 cm / min.

(Examples 2 to 4)
A fence member (lattice) was produced in the same manner as in Example 1 except that the numbers of glass fibers and aramid fibers were changed as shown in Table 1. Example 4 is a comparative example using no aramid fiber.
Table 1 shows the ratio (unit: volume%) occupied by aramid fibers in the total volume of reinforcing fibers (volume of glass fibers + volume of aramid fibers). The content of reinforcing fibers in the fiber reinforced resin was 50% by volume.

(Evaluation of cutting resistance)
The same worker manually cuts the fence member (grid) obtained in Examples 1 to 4 using a steel saw blade (manufactured by Fujikoshi Co., Ltd., product name: “HAND HACK SAW BLADES” NACHI TH, length 250 mm). The time required for complete cutting (cutting time) was measured. The results are shown in Table 1.

  As shown in the results of Table 1, compared with Example 4 using only glass fibers as reinforcing fibers, Examples 1 to 3 using glass fibers and aramid fibers have increased cutting time and improved cutting resistance. You can see that In particular, Examples 1 and 2 in which the proportion of aramid fibers in the entire reinforcing fiber is 10% by volume or more have a cutting time increased by more than twice as compared with Example 4, and have sufficient cutting resistance. You can see that

(Example 5)
A fence member (lattice) was produced using a piano wire that is a metal fiber as a hard-to-cut fiber.
That is, a fence member (lattice) was manufactured in the same manner as in Example 1 except that 34 glass fibers (2200 tex) and one piano wire were used as reinforcing fibers. The proportion occupied by glass fibers in the entire reinforcing fiber is 97% by volume, and the proportion occupied by piano wire is 3% by volume. The content of reinforcing fibers in the fiber reinforced resin was 50% by volume.
When cutting resistance was evaluated in the same manner as in Example 1, it was not possible to cut with the steel saw blade.

It is a perspective view which shows the example of a protection fence. It is sectional drawing which shows one Embodiment of the fence member of this invention. It is a graph for demonstrating how to obtain | require total strain energy.

Explanation of symbols

1 ... post (fence member),
2 ... trunk edge (fence member),
3 ... lattice (fence member),
10 ... fence member,
11 ... Core material,
12 ... Surface layer.

Claims (4)

  The fence member characterized by forming using the fiber reinforced resin which impregnated the matrix resin composition in the reinforcement fiber containing the hard-to-cut fiber which has hard-to-cut property.   The fence member according to claim 1, wherein the reinforcing fiber includes glass fiber.   The hard-cut fiber is at least one selected from the group consisting of aramid fiber, polyethylene fiber, polyester fiber, polyparaphenylene benzobisoxazole fiber, and polyvinyl alcohol fiber, and 5% by volume or more of the reinforcing fiber is hard-cut. The fence member according to claim 1 or 2, which is a fiber.   The fence member according to claim 1 or 2, wherein the hard-to-cut fibers are metal fibers, and 0.2% by volume or more of the reinforcing fibers are hard-to-cut fibers.

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