JP2009235306A - Prepreg sheet for reinforcement, and reinforcing method for structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a prepreg sheet for reinforcement having excellent mechanical strengths and excellent in lightweight properties. <P>SOLUTION: The prepreg sheet for reinforcement can be preferably used for applications where lightweight properties and strength are required such as a blade for wind power generation or the like because it is excellent in lightweight properties and develops an excellent strength and it is characterized by impregnating an uncured curable resin on a mesh-like body formed by the bundle of fibers containing aramide fibers and basalt fibers. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

    The present invention relates to a reinforcing prepreg sheet and a method for reinforcing a structure using the same.

  In recent years, global warming has progressed, and the global environment is being preserved globally. As part of this effort, efforts are being made mainly in Europe to shift power supply from conventional thermal power generation to power generation using the natural power of wind power generation.

  Many blades for wind power generation have been proposed, including Patent Document 1. In order to improve the power generation efficiency of wind power generation, an increase in the size of the blade is required, and although glass fiber is used to improve the strength accompanying the increase in size, the glass fiber is heavy and the blade is As a result, there was a limit to increasing the size of the blade.

Japanese Patent Application Laid-Open No. 9-100774

  The present invention provides a reinforcing prepreg sheet having excellent mechanical strength and excellent lightness, and a method for reinforcing a structure using the same.

  The present invention is characterized in that an uncured thermosetting resin is impregnated into a network formed from a fiber bundle containing the aramid fiber or basalt fiber of the present invention. Aramid fibers exhibit the same performance as carbon fibers in terms of strength, have a specific gravity about half that of glass fibers, and are excellent in lightness. The aramid fiber includes a para type and a meta type, but the para type is preferable because the strength is excellent.

  Further, the basalt fiber exhibits the same performance as the carbon fiber in terms of heat resistance, incombustibility, and weather resistance, and the composition is made of basalt.

  A fiber bundle containing an aramid fiber or a basalt fiber is a bundle of monofilaments, which is called a multifilament, and may be a monofilament twisted or untwisted, The monofilament is preferably untwisted because it is excellent in impregnation of the curable resin and can uniformly and sufficiently impregnate the net-like body.

  As a net-like body formed from fiber bundles, for example, as shown in FIG. 1 or FIG. 2, many fiber bundles 1a, 1a... Are arranged in parallel at predetermined intervals, preferably every 5 to 20 mm. A fiber bundle row 1B formed by juxtaposing a plurality of fiber bundles 1b, 1b,... At a predetermined interval in a direction oblique or perpendicular to the fiber bundle 1a of the fiber bundle row 1A. A plurality of through holes 1c are provided by integrating the intersections of the fiber bundles 1a and 1b of these fiber bundle rows 1A and 1B by a known means such as heat fusion or adhesive. As shown in FIG. 3 or FIG. 4, a large number of fiber bundles 1d, 1d,... Are arranged on a surface of the mesh body obtained in this way at predetermined intervals, preferably every 5 to 20 mm. The formed fiber bundle row 1D is superposed in the direction oblique to the two rows of fiber bundle rows 1A and 1B forming the network, and the fiber bundle 1a of the fiber bundle row 1A (1B) is formed. 1b) and a net-like body formed by integrating a crossing portion of the fiber bundle row 1D with the fiber bundle 1d by an adhesive or heat fusion to provide a plurality of through holes 1c, as shown in FIG. As described above, a plurality of fiber bundles 1d, 1d... Are arranged in parallel at predetermined intervals, preferably every 5 to 20 mm, and a fiber bundle row 1D and a plurality of fiber bundles 1e, 1e. The fiber bundle row 1E arranged in parallel at every interval, preferably every 5 to 20 mm, is overlapped in the oblique direction to the two fiber bundle rows 1A and 1B forming the network, and the fiber bundle row 1A (1B) fiber bundle 1a (1b) and fiber bundle row 1D, 1E fiber bundles 1d, 1e are integrated by adhesive or heat fusion to form a large number of through holes 1c The network shown in FIG. 5, which is excellent in strength in various directions, is preferable.

  The network is impregnated with a thermosetting resin. Such a thermosetting resin is not particularly limited, and examples thereof include an epoxy resin, a phenol resin, a vinyl ester resin, a polyimide resin, an unsaturated polyester resin, and the like, and an epoxy resin is preferable.

  Further, an ultraviolet absorber and an antioxidant may be added to the thermosetting resin. Thus, by containing the ultraviolet absorber and the antioxidant, excellent strength can be maintained over a long period even when used outdoors.

  The ultraviolet absorber is not particularly limited, and for example, 2,4-dihydroxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2′-dihydroxy-4- Benzophenone ultraviolet absorbers such as methoxybenzophenone, 2,2′-hydroxy-4,4′-dimethoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, 2- (2′-hydroxy-5′-tert) -Butylphenyl) benzotriazole, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole 2- (2′-hydroxy-3 ′, 5′-di-t benzotriazole ultraviolet absorbers such as rt-butylphenyl) -5-chlorobenzotriazole and 2- (2′-hydroxy-3 ′, 5′-di-tert-amylphenyl) -5-chlorobenzotriazole, salicylic acid esters Type ultraviolet absorbers, cyanoacrylate type ultraviolet absorbers, and the like. These may be used alone or in combination of two or more.

  The antioxidant is not particularly limited, and any conventionally known antioxidant may be used. Usually, there are many which have an effect as the heat stabilizer, for example, carboxylic acid. Examples include chelators such as metal salts, phenolic antioxidants, and organic phosphites. These antioxidants may be used alone or in combination of two or more.

  If the content of the UV absorber and antioxidant in the thermosetting resin is small, the effect of adding the UV absorber may not be manifested. If the content is large, the mechanical strength of the thermosetting resin is only lowered. Instead, the saturation of the additive may make it difficult to achieve the effect, so 0.1 to 5 parts by weight is preferable with respect to 100 parts by weight of the thermosetting resin.

  And, as a method for impregnating the net-like body with the thermosetting resin, a known method is used, and a simpler method such as a hand lay-up method may be used in addition to a vacuum resin impregnation method and a pressure resin impregnation method. .

  The reinforcing prepreg sheet thus configured can be suitably used for reinforcing a structure, and can be suitably used as a reinforcing material for a blade for wind power generation that requires strength and light weight.

  Next, the point which reinforces the blade for wind power generation using the reinforcing prepreg sheet of the present invention will be described with reference to FIGS. The blade 2 for wind power generation is constituted by a main girder 21 having a predetermined length and a foam 22 such as a polyurethane resin foam disposed so as to cover the main girder 21.

  In order to reinforce the wind power generation blade 2, the reinforcing prepreg sheet A is spirally wound from the end portion in the length direction of the wind power generation blade 2 in a state where parts are overlapped with each other spirally. The wind power generation blade 2 is entirely covered with the reinforcing prepreg sheet A. At this time, since the reinforcing prepreg sheet A is excellent in flexibility, the reinforcing prepreg sheet A can be reliably wound around the surface of the wind power generation blade 2 without a gap.

  After that, the reinforcing prepreg sheet A is hardened by heating the reinforcing prepreg sheet A to make the reinforcing prepreg sheet strong, and the reinforcing prepreg sheet A portions that are overlapped with each other are integrated. The power generation blade 2 can be entirely covered with the reinforcing prepreg sheet A to be reinforced.

  In addition, although the case where the blade for wind power generation was reinforced with the prepreg sheet A for reinforcement was described, the present invention is not limited to this, and examples of the structural body include a vehicle housing and a board housing.

  The reinforcing prepreg sheet of the present invention is characterized by being impregnated with an uncured thermosetting resin into a network formed from a fiber bundle containing aramid fibers or basalt fibers, and thus is excellent in lightness. At the same time, since it exhibits excellent mechanical strength by being cured, it can be suitably used for applications that require light weight and strength, such as blades for wind power generation.

  In the reinforcing prepreg sheet, when the monofilaments of the fiber bundle are bundled in a non-twisted manner, the thermosetting resin can be uniformly and surely impregnated into the mesh body.

  Further, in the reinforcing prepreg sheet, when the thermosetting resin contains an ultraviolet absorber, excellent strength is maintained over a long period even when used outdoors.

It is the top view which showed the net-like body which comprises the prepreg sheet for reinforcement of this invention. It is the top view which showed another example of the mesh body which comprises the prepreg sheet for reinforcement of this invention. It is the top view which showed another example of the mesh body which comprises the prepreg sheet for reinforcement of this invention. It is the top view which showed another example of the mesh body which comprises the prepreg sheet for reinforcement of this invention. It is the top view which showed another example of the mesh body which comprises the prepreg sheet for reinforcement of this invention. It is the perspective view which showed the point which reinforces the blade for wind power generation using the prepreg sheet for reinforcement of this invention. It is the perspective view which showed the state which reinforced the braid | blade for wind power generation using the prepreg sheet for reinforcement of this invention.

Explanation of symbols

1 Mesh 2 Blade for wind power generation
21 Main digit
22 Foam A Reinforced prepreg sheet

Claims (5)

A reinforcing prepreg sheet obtained by impregnating an uncured thermosetting resin into a net formed from a fiber bundle containing aramid fibers or basalt fibers. The reinforcing prepreg sheet according to claim 1, wherein the fiber bundle is formed by bundling monofilaments in a non-twisted manner. The reinforcing prepreg sheet according to claim 1, wherein the thermosetting resin contains an ultraviolet absorber. A reinforcing prepreg sheet formed by impregnating an uncured thermosetting resin into a network made of aramid fiber bundles is wound around the surface of the structure, and then the thermosetting resin is cured. Reinforcement method. The structure reinforcing method according to claim 4, wherein the structure is a blade for wind power generation.

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