JP2008126615A - Method for manufacturing fiber-reinforced plastic member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an FRP member controllable of an amount of a matrix resin and a rate of fiber volume contained in a multilayered FRP layer. <P>SOLUTION: This method for manufacturing an FRP member comprises forming a multilayered FRP layer by winding fibers containing matrix resins 12a, 12b and 12c, respectively around a substrate material 20 employing the filament winding process, and heating to cure the multilayered FRP layer, wherein the matrix resins used have each different starting temperature of curing for every single layer or a plurality of layers in the multilayered FRP layer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for manufacturing a FRP member by a filament winding method.

  BACKGROUND ART A pressure vessel (gas cylinder) mounted on a propeller shaft for a vehicle such as an automobile or an electric vehicle uses an FRP (Fiber Reinforced Plastic) member that is superior in weight and toughness compared to iron or the like. The FRP member includes, for example, a base material such as a resin and an FRP layer (or a multilayer FRP layer) that is a fiber layer containing a matrix resin.

  As a method for forming a multilayer FRP layer, a filament winding method is generally known. In the filament winding method, for example, a fiber impregnated with a matrix resin is wound around a cylindrical substrate to form a multilayer FRP layer.

  The FRP member is obtained by forming a multilayer FRP layer using a filament winding method and heat-curing the multilayer FRP layer.

  For example, Patent Documents 1 and 2 describe that a multilayer FRP layer is formed by winding a fiber impregnated with a matrix resin around a cylindrical base material having a gas barrier property, and heating and curing the multilayer FRP layer. A method of manufacturing a gas cylinder by making them equal is proposed.

  However, in the manufacturing methods of Patent Documents 1 and 2, the same type of matrix resin in the multilayer FRP layer is used. Therefore, the matrix resin whose viscosity has been reduced when the multilayer FRP layer is heat-cured flows out of the multilayer FRP layer. In particular, the matrix resin on the inner layer side (base material side) of the multilayer FRP layer tends to ooze out to the outer layer side (side opposite to the base material) before curing.

  If it does so, content of the matrix resin of the whole multilayer FRP layer will reduce, fiber volume content rate (Vf) will become high, and the intensity | strength of the FRP member obtained will fall.

  Usually, in order to prevent the matrix resin on the inner layer side of the multilayer FRP layer from exuding to the outer layer side during heat curing, the tension (filament winding tension: hereinafter referred to as FW tension) for winding the fiber containing the matrix resin around the substrate It is also possible to prepare. However, when prepared with FW tension or the like, the entire multilayer FRP layer becomes rich in the matrix resin and the fiber volume content decreases, so that there may be an increase in the weight of the FRP member, a decrease in quality, a decrease in rigidity, a decrease in strength, and the like.

  Thus, normally, the filament winding method cannot control the content of the matrix resin and the fiber volume content of each layer of the multilayer FRP layer. This is particularly difficult with the wet filament winding method described below. In addition, by controlling the matrix resin content and fiber volume content of each layer of the multilayer FRP layer, the inner layer side of the multilayer FRP layer is rich in matrix resin (that is, low fiber volume content), and the outer layer side contains a high fiber volume. It is effective in terms of improving the strength, weight reduction, quality improvement, etc. of the FRP member.

JP-A-8-216277 JP-A-8-219391

  This invention is a manufacturing method of the FRP member which can control the content of the matrix resin of each layer of a multilayer FRP layer, and fiber volume content rate. In particular, this is a method for producing an FRP member in which the inner layer side of the multilayer FRP layer is rich in matrix resin and the outer layer side can have a high fiber volume content.

  The present invention is a method of manufacturing an FRP member in which a fiber including a matrix resin is wound around a substrate using a filament winding method to form a multilayer FRP layer, and the multilayer FRP layer is heated and cured to manufacture an FRP member. A matrix resin having a different curing start temperature is used for each single layer or each of the plurality of layers of the multilayer FRP layer.

  In addition, the present invention is a method for manufacturing an FRP member in which a fiber including a matrix resin is wound around a substrate using a filament winding method to form a multilayer FRP layer, and the multilayer FRP layer is heated and cured to manufacture an FRP member. Then, a matrix resin having a different curing start temperature and different viscosity at the start of curing is used for each single layer or each of the plurality of layers of the multilayer FRP layer.

  Moreover, in the manufacturing method of the FRP member, it is preferable to use a matrix resin having a lower curing start temperature toward the outer layer in the multilayer FRP layer.

  Moreover, in the manufacturing method of the said FRP member, it is preferable to use matrix resin with a high hardening start temperature, so that it goes to an outer layer among the said multilayer FRP layers.

  Moreover, in the manufacturing method of the said FRP member, it is preferable to use the matrix resin whose viscosity at the time of a hardening start is so low that it goes to an outer layer among the said multilayer FRP layers.

  According to the present invention, the matrix resin content and the fiber volume content of each layer of the multilayer FRP layer are controlled by using a matrix resin having a different curing start temperature for each single layer or multiple layers of the multilayer FRP layer. The manufacturing method of the FRP member which can be provided can be provided.

  Embodiments of the present invention will be described below.

  The manufacturing method of the FRP member according to the present embodiment is a method of manufacturing a FRP member by winding a fiber including a matrix resin around a substrate using a filament winding method to form a multilayer FRP layer, and heat-curing the multilayer FRP layer. And the matrix resin from which hardening start temperature differs is used for every single layer or multiple layers of a multilayer FRP layer.

  The filament winding method used in this embodiment includes a wet filament winding method, a dry filament winding method, and the like.

  FIG. 1 is a diagram showing a production example of a multilayer FRP layer by a wet filament winding method. In the present embodiment, an example using three types of matrix resins having different curing start temperatures will be described.

  As shown in FIG. 1, after the fiber 16 drawn out from the reel 14a is immersed in the matrix resin 12a in the resin bath 10a, the excess matrix resin 12a in the fiber 16 is removed by the roll 18a. Thereafter, the fibers 16 in which the matrix resin 12a is immersed are wound around the base material 20 to form a single layer or a plurality of FRP layers. Thereafter, in the same manner as described above, the fibers 16 in which the matrix resin 12b is immersed are wound around the base material 20 and the fibers 16 in which the matrix resin 12c is immersed are sequentially wound around the base material 20 to form a single layer or a plurality of FRP layers. Is done. In this way, a multilayer FRP layer is formed.

  On the other hand, the production of the multilayer FRP layer by the dry filament winding method is performed by, for example, sequentially impregnating fibers with resins A, B, and C having different curing start temperatures (prepregs A, B, and C) on the base material in order. Wrapping to form a multilayer FRP layer.

  Next, an example of how to wind the fiber (including prepreg) containing the matrix resin by the filament winding method will be described. 2A is a schematic diagram illustrating an example of hoop winding in the filament winding method, and FIG. 2B is a schematic diagram illustrating an example of helical winding in the filament winding method. As shown in FIG. 2A, the hoop winding is to wind the matrix resin-containing fibers 16 substantially perpendicularly to the axial direction (arrow X) of the substrate 20. Further, as shown in FIG. 2B, the helical winding is to wind the matrix resin-containing fibers 16 in a spiral shape along the axial direction (arrow X) of the substrate 20. Although the FRP layer can be formed on the substrate 20 by the above hoop winding, helical winding, or the like, the winding method of the present embodiment is not limited to the above hoop winding or helical winding.

  FIG. 3 is a partial schematic cross-sectional view of a multilayer FRP layer produced by a filament winding method. As shown in FIG. 3, the multilayer FRP layer 22 formed on the surface of the substrate 20 is formed by forming a plurality of FRP layers by the above-described hoop winding, helical winding, or the like. In the present embodiment, as shown in FIG. 3, an example in which six FRP layers (24a, 24b, 24c, 24d, 24e, 24f) are formed will be described.

  The multilayer FRP layer 22 may be formed by hoop winding (hereinafter referred to as Ho) or helical winding (hereinafter referred to as He) alone, or may be formed by combining hoop winding or helical winding. Good. The combination of the hoop winding and the helical winding is not particularly limited. For example, from the inner layer side of the multilayer FRP layer 22, that is, from the FRP layer 24a, Ho-He-Ho-He-Ho-He and Ho-Ho -He-He-Ho-Ho, He-Ho-Ho-He-Ho-He, etc. are mentioned.

  Next, the matrix resin used in this embodiment will be described.

  As the matrix resin, one having a different curing start temperature is used for each single layer (for example, 24a shown in FIG. 3) of the multilayer FRP layer or for each of a plurality of layers (for example, 24a to 24c shown in FIG. 3). As a thing with different hardening start temperature, although the difference of the hardening start temperature of the matrix resin used for every single layer or every several layers of a multilayer FRP layer should just be different, what is 10 degreeC or more is preferable. For example, when three kinds of matrix resins having different curing start temperatures are used, for example, if the curing start temperature of the matrix resin A is 80 ° C., the curing start temperature of the matrix resin B is 90 ° C. or higher (or 70 ° C. or lower). If the curing start temperature of the matrix resin B is 90 ° C. (or 70 ° C.), the curing start temperature of the matrix resin C is preferably 100 ° C. or higher (or 60 ° C. or lower). When the multilayer FRP layer 22 shown in FIG. 3 is formed using the matrix resins A, B, and C (hereinafter simply referred to as “A”, “B”, and “C”), for example, the inner layer of the multilayer FRP layer 22 may be used. From the side, that is, from the FRP layer 24a, A-B-C-A-B-C, A-A-B-B-C-C, and the like can be mentioned. Thus, among the multilayer FRP layers, the matrix resin content and the fiber volume content of each layer of the multilayer FRP layer are arbitrarily controlled by using a matrix resin having a different curing start temperature for each single layer or for each of a plurality of layers. be able to. Therefore, a multilayer FRP layer having a complicated layer configuration can be formed.

  Here, the fiber volume content represents the volume occupied by the fibers per unit volume of the FRP layer. Further, when the fiber volume content is high, the amount of the matrix resin per unit volume of the FRP layer is small, and when the fiber volume content is low, the amount of the matrix resin per unit volume of the FRP layer is large.

  After the formation of the multilayer FRP layer, the FRP member is obtained by heat-curing the multilayer FRP layer. The heating conditions are appropriately set depending on the thickness of the multilayer FRP layer, the type of matrix resin to be used, and the like, and are not particularly limited.

  FIG. 4 is a diagram for explaining the curing start temperature of the matrix resin, and is a temperature rising viscosity curve of the matrix resin. The curing start temperature of the matrix resin refers to a temperature at which the slope changes from zero to positive (plus) in the temperature rising viscosity curve of the matrix resin shown in FIG.

  In addition, it is preferable that the matrix resin has a different curing start temperature for each single layer or each of a plurality of layers and also has a different viscosity at the start of curing. As the difference in viscosity at the start of curing, the difference in viscosity at the start of curing of the matrix resin used for each single layer or every plurality of layers may be different, but is preferably 10 Pa · s or more. . For example, if the matrix resin A (curing start temperature 80 ° C.), B (curing start temperature 90 ° C.), and C (curing start temperature 100 ° C.) are used, for example, the viscosity at the start of curing of the matrix resin A is 310 Pa · If it is s, the viscosity at the start of curing of the matrix resin B is preferably 400 Pa · s or more, and if the viscosity at the start of curing of the matrix resin B is 400 Pa · s, the viscosity at the start of curing of the matrix resin C The viscosity is preferably 410 Pa · s or more.

  Further, the viscosity at the start of curing of the matrix resin refers to the viscosity at the curing start temperature described above in the temperature rising viscosity curve of the matrix resin shown in FIG. Thus, the matrix resin content and the fiber volume content of each layer of the multilayer FRP layer can be more efficiently controlled by using matrix resins having different curing start temperatures and different viscosity at the start of curing.

  The viscosity curve (or viscosity at the start of curing) of the matrix resin as shown in FIG. 4 can be measured by a viscosity measuring apparatus (manufactured by Eiko Instruments Co., Ltd., Rheo Stress RS600).

  Moreover, it is preferable to form a multilayer FRP layer using matrix resin with a low hardening start temperature, so that it goes to an outer layer among the multilayer FRP layers (arrow Y shown in FIG. 3). It is possible to cure from the outer layer of the multilayer FRP layer, that is, from the matrix resin in the FRP layer 24f shown in FIG. 3, by using a matrix resin having a lower curing start temperature toward the outer layer (arrow Y shown in FIG. 3). Become. That is, the outer layer (for example, FRP layer 24f) in which the matrix resin is cured first becomes a wall, and the matrix resin of the inner layer (for example, FRP layer 24a) can be prevented from oozing out of the FRP layer. Therefore, since the inner layer side in the multilayer FRP layer can be made matrix resin rich (that is, low fiber volume content) and the outer layer side can be made high fiber volume content, the strength improvement, weight reduction, quality, etc. of the FRP member can be improved. Effective in terms.

  Further, it is more preferable to form the multilayer FRP layer using a matrix resin having a higher curing start temperature toward the outer layer (arrow Y shown in FIG. 3) among the multilayer FRP layers. By using a matrix resin having a higher curing start temperature toward the outer layer, the matrix resin on the inner layer side is cured before oozing out to the outer layer side, so that a multilayer resin is used rather than a matrix resin having a lower curing start temperature toward the outer layer. The inner layer side of the FRP layer can be made rich in matrix resin and the outer layer side can be made high fiber volume content.

  Moreover, it is more preferable to form a multilayer FRP layer using the matrix resin whose viscosity at the time of a hardening start is so low that it goes to an outer layer among the multilayer FRP layers (arrow Y of FIG. 3). By using a matrix resin having a lower viscosity at the start of curing as it goes to the outer layer of the multilayer FRP layer, the matrix resin on the inner layer side hardly flows and the matrix resin on the outer layer side easily flows. The resin can be rich, and the outer layer side can have a high fiber volume content.

  In this embodiment, in order to use a matrix resin having a different curing start temperature for each single layer or multiple layers of the multilayer FRP layer, the type of the matrix resin used, the molecular structure, or the type of the curing agent to be added is changed. Etc. are necessary.

  Examples of the matrix resin include, but are not limited to, phenol resin, urea resin, unsaturated polyester resin, vinyl ester resin, polyimide resin, bismaleimide resin, polyurethane resin, diallyl phthalate resin, and epoxy resin. is not. In the present embodiment, for example, a plurality of matrix resins having different curing start temperatures can be selected from the above resins and the like, and can be used for each single layer or each of the plurality of layers of the multilayer FRP layer.

  Examples of the molecular structure of the matrix resin include, in the case of an epoxy resin, bisphenol A type epoxy resin, bisphenol AD type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, and the like. . In the present embodiment, for example, a plurality of matrix resins having different curing start temperatures can be selected from the above resins and the like, and can be used for each single layer or each of the plurality of layers of the multilayer FRP layer.

  Examples of the curing agent added to the matrix resin include aliphatic amines such as ethylenediamine, aliphatic polyamines such as diethylenetriamine, aromatic amines such as metaphenylenediamine or diaminodiphenylsulfone, piperidine, diazapicycloundecene, and the like. Examples thereof include acid anhydride curing agents such as primary and tertiary amines and methyltetrahydrophthalic anhydride. In the present embodiment, for example, a plurality of curing agents that can vary the curing start temperature of the matrix resin can be selected and used for each single layer or each of the multiple layers of the multilayer FRP layer.

  Examples of the base material used in this embodiment include metal materials such as stainless steel, aluminum, aluminum alloy, and iron, polyethylene resin, polypropylene resin, polyamide resin, ABS resin, polybutylene terephthalate resin, polyacetal resin, and polycarbonate resin. And other thermoplastic resins.

  Examples of the fiber used in the present embodiment include carbon fiber, glass fiber, aramid fiber, boron fiber, polyethylene fiber, steel fiber, zylon fiber, and vinylon fiber. The number of fibers (filaments) of the fibers used in the present embodiment is not particularly limited, but is in the range of 1000 to 50000 filaments, preferably 3000 to 30000 filaments. If the number of fibers of the fiber used in the present embodiment is lower than 1000 filaments, the content of the matrix resin contained in the fibers may be reduced. If the number of fibers exceeds 50000 filaments, the fibers are thickened to form a multilayer FRP layer. May be difficult. In particular, carbon fiber is preferable from the viewpoint of high strength, high elastic modulus and light weight.

  As described above, the manufacturing method of the FRP member according to the present embodiment uses the matrix resin having a different curing start temperature for each single layer or a plurality of layers of the multilayer FRP layer. The content and the fiber volume content can be arbitrarily controlled. In addition, by using a matrix resin having a lower curing start temperature or a matrix resin having a higher curing start temperature, the inner layer side of the multilayer FRP layer is made rich in the matrix resin and the outer layer side is higher in the fiber. Since it can be set as a volume content rate, the strength improvement, weight reduction, quality improvement, etc. of an FRP member can be aimed at.

  The manufacturing method of the FRP member according to the present embodiment includes, for example, propeller shafts for vehicles such as automobiles, air, oxygen, liquefied propane gas, liquefied natural gas, etc. used for vehicles, fire fighting, medical, leisure, etc. It can be used as a method for producing a pressure vessel (gas cylinder) or the like.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated more concretely, this invention is not limited to a following example.

  The manufacturing method of the pressure vessel used for vehicles etc. is demonstrated below as an example.

(Example 1)
<Various materials used for manufacturing pressure vessels>
First, the base material constituting the pressure vessel, that is, the base material on which the fiber containing the matrix resin is wound using the filament winding method will be described. FIG. 5 is a schematic cross-sectional view of a substrate on which fibers containing a matrix resin are wound using a filament winding method. The base material 26 includes a base portion 28, a body portion 30, and a boss 32.

  The trunk portion 30 may be any one having gas impermeability, and the cavity portion 34 in the trunk portion 30 is filled with gas. The trunk | drum 30 is formed with the metal, resin, etc. which were demonstrated above, for example.

  The nozzle part 28 is provided with a nozzle that fills the cavity 34 with gas and takes out the gas from the cavity 34. The base portion 28 and the boss 32 are used as shafts for rotating the base material 26 when a fiber containing a matrix resin is wound around the base material 26 using the filament winding method. The base portion 28 and the boss 32 are formed of the above-described metal or the like in terms of strength. In Example 1, the base part 28 and the boss 32 were formed of aluminum or SUS.

  Next, the matrix resin used in Example 1 will be described. FIG. 6 is a diagram showing a temperature rising viscosity curve of the matrix resin used in Example 1. The temperature rising viscosity curve was measured with a viscosity measuring device (manufactured by Eiko Seiki Co., Ltd., Rheo Stress RS600). Three types of matrix resins A1, B1, and C1 having different curing start temperatures as shown in FIG. 6 were used. The matrix resin A1 is an epoxy resin. From the temperature rising viscosity curve of FIG. 6, the curing start temperature was 85 ° C., and the viscosity at the start of curing was 210 Pa · s. The matrix resin B1 is an epoxy resin, and from the temperature rising viscosity curve of FIG. 6, the curing start temperature was 95 ° C., and the viscosity at the start of curing was 320 Pa · s. The matrix resin C1 is an epoxy resin. From the temperature rising viscosity curve of FIG. 6, the curing start temperature was 150 ° C., and the viscosity at the start of curing was 420 Pa · s.

  In Example 1, carbon fibers of about 24,000 filaments were used.

<Formation of multilayer FRP layer and FRP member>
A wet filament winding method as shown in FIG. 1 was used to form the multilayer FRP layer. In Example 1, the multilayer FRP layer was formed using a matrix resin having a lower curing start temperature toward the outer layer among the multilayer FRP layers. This will be specifically described below.

  1 was immersed in the matrix resin C1 in the resin bathtub 10a, and then the excess matrix resin C1 in the fiber 16 was removed by the roll 18a. Then, the fiber 16 in which the matrix resin C1 was immersed was wound around the base material 26 shown in FIG. 5 by hoop winding to form two FRP layers. Thereafter, in the same manner as described above, the fibers 16 in which the matrix resin B1 is immersed are helically wound on the base material 26 shown in FIG. 5, and the fibers 16 in which the matrix resin A1 is immersed are successively wound on the base material 26 shown in FIG. Winding and two FRP layers were formed. That is, a multilayer FRP layer having a total of 6 FRP layers was formed.

  After the formation of the multilayer FRP layer, the multilayer FRP layer was heated and cured at 90 ° C. for 1 hour, 100 ° C. for 1 hour, 110 ° C. for 1 hour, and 140 ° C. for 2 hours to obtain a pressure vessel as an FRP member.

  FIG. 7 is a schematic cross-sectional view of a pressure vessel. FIG. 8 is an enlarged schematic cross-sectional view of the pressure vessel in a dotted frame r shown in FIG. In Example 1, in the FRP member 1 shown in FIGS. 7 and 8, the FRP layers 36a and 36b of the multilayer FRP layer 35 are provided with a matrix resin C1, and the FRP layers 36c and 36d are provided with a matrix resin B1 and an FRP layer 36e, For 36f, matrix resin A1 was used.

  Thus, by using the matrix resin having a lower curing start temperature toward the outer layer among the multilayer FRP layer 35, it is possible to cure from the outer layer (for example, FRP layers 36e and 36f) of the multilayer FRP layer 35, It was possible to prevent the matrix resin C1 of the inner layer (for example, the FRP layers 36a and 36b) from oozing out of the FRP layer. As a result, the multilayer FRP layer of the pressure vessel of Example 1 is such that the inner layer side (for example, FRP layers 36a, 36b) is matrix resin rich (ie, low fiber volume content), and the outer layer side (for example, FRP layer 36e, 36f) was a high fiber volume content.

(Example 2)
The matrix resin used in Example 2 will be described. FIG. 9 is a diagram showing a temperature rising viscosity curve of the matrix resin used in Example 2. As shown in FIG. 9, three types of matrix resins A2, B2, and C2 having different thermosetting start temperatures were used. The matrix resin A2 is an epoxy resin. From the temperature rising viscosity curve of FIG. 9, the curing start temperature was 80 ° C., and the viscosity at the start of curing was 380 Pa · s. The matrix resin B2 is an epoxy resin, and from the temperature rising viscosity curve of FIG. 9, the curing start temperature was 90 ° C., and the viscosity at the start of curing was 320 Pa · s. The matrix resin C2 is an epoxy resin. From the temperature rising viscosity curve of FIG. 9, the curing start temperature was 100 ° C., and the viscosity at the start of curing was 200 Pa · s. Moreover, about the base material and the fiber, those similar to those in Example 1 were used.

<Formation of multilayer FRP layer and FRP member>
A wet filament winding method as shown in FIG. 1 was used to form the multilayer FRP layer. In Example 2, the multilayer FRP layer was formed using a matrix resin having a higher curing start temperature toward the outer layer among the multilayer FRP layers. This will be specifically described below.

  After the fibers 16 (fibers described above) fed from the reel 14a were immersed in the matrix resin A2 in the resin bath 10a, the excess matrix resin A2 in the fibers 16 was removed by the roll 18a. Then, the fiber 16 in which the matrix resin A2 was immersed was wound around the base material 26 shown in FIG. 5 by hoop winding to form two FRP layers. Thereafter, in the same manner as described above, the fibers 16 in which the matrix resin B2 is immersed are helically wound on the base material 26 shown in FIG. 5, and the fibers 16 in which the matrix resin C2 is immersed are sequentially wound on the base material 26 shown in FIG. Winding and two FRP layers were formed. That is, a multilayer FRP layer having a total of 6 FRP layers was formed.

  After the formation of the multilayer FRP layer, the multilayer FRP layer was heated and cured at 85 ° C. for 1 hour, 95 ° C. for 1 hour, 105 ° C. for 1 hour, and 135 ° C. for 2 hours to obtain a pressure vessel as an FRP member.

  In Example 2, in the FRP member 1 shown in FIGS. 7 and 8, the FRP layers 36a and 36b of the multilayer FRP layer 35 are provided with a matrix resin A2, and the FRP layers 36c and 36d are provided with a matrix resin B2 and an FRP layer 36e, For 36f, matrix resin C2 was used.

  Thus, by using a matrix resin having a higher curing start temperature toward the outer layer in the multilayer FRP layer 35, the inner layer (for example, the FRP layers 36a and 36b) is suppressed because the resin is cured from the outer layer and the resin on the inner layer side is suppressed. ) Of the matrix resin C1 was suppressed from oozing out of the FRP layer. As a result, in the multilayer FRP layer of the pressure vessel of Example 2, the inner layer side (for example, FRP layers 36a and 36b) is rich in matrix resin, and the outer layer side (for example, FRP layers 36e and 36f) has a high fiber volume content. Met.

  Thus, by using a matrix resin having a higher or lower curing start temperature toward the outer layer among the multilayer FRP layers, the inner layer side could be made rich in the matrix resin and the outer layer side could be made to have a high fiber volume content. . In particular, among the multilayer FRP layers, by using a matrix resin having a lower curing start temperature toward the outer layer, the inner layer side could be made rich in the matrix resin, and the outer layer side could have a higher fiber volume content.

It is a figure which shows the example of preparation of the multilayer FRP layer by the wet filament winding method. It is a schematic diagram which shows an example of the hoop winding and helical winding in a filament winding method. It is a partial schematic cross section of the multilayer FRP layer produced by the filament winding method. It is a figure for demonstrating the hardening start temperature of matrix resin, and is a temperature rising viscosity curve of matrix resin. It is a schematic cross section of the base material around which the fiber containing a matrix resin is wound using the filament winding method. 2 is a graph showing a temperature rising viscosity curve of a matrix resin used in Example 1. FIG. It is a schematic cross section of a pressure vessel. It is an expansion schematic cross section of the pressure vessel in the dotted-line frame r shown in FIG. 4 is a diagram showing a temperature rising viscosity curve of a matrix resin used in Example 2. FIG.

Explanation of symbols

  1 FRP member, 10a, 10b, 10c resin bathtub, 12a, 12b, 12c matrix resin, 14a, 14b, 14c reel, 16 fibers, 18a, 18b, 18c roll, 20, 26 base material, 22, 35 multilayer FRP layer, 24a-24f, 36a-36f FRP layer, 28 base part, 30 trunk part, 32 boss, 34 cavity part.

Claims (5)

A method of manufacturing an FRP member, in which a fiber including a matrix resin is wound around a substrate using a filament winding method to form a multilayer FRP layer, and the multilayer FRP layer is heated and cured to manufacture an FRP member,
A method for manufacturing an FRP member, wherein a matrix resin having a different curing start temperature is used for each single layer or for each of a plurality of layers of the multilayer FRP layer. A method of manufacturing an FRP member, in which a fiber including a matrix resin is wound around a substrate using a filament winding method to form a multilayer FRP layer, and the multilayer FRP layer is heated and cured to manufacture an FRP member,
A method for producing an FRP member, wherein a matrix resin having a different curing start temperature and different viscosity at the start of curing is used for each single layer or each of the plurality of layers of the multilayer FRP layer.   3. The method for manufacturing an FRP member according to claim 1, wherein a matrix resin having a lower curing start temperature is used toward the outer layer of the multilayer FRP layer. 4.   3. The method of manufacturing an FRP member according to claim 1, wherein a matrix resin having a higher curing start temperature is used toward the outer layer of the multilayer FRP layer. 4.   6. The method of manufacturing an FRP member according to claim 4, wherein a matrix resin having a lower viscosity at the start of curing is used as it goes toward the outer layer of the multilayer FRP layer.

Images