JP2006130732A - Manufacturing method of fiber reinforced resin molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a fiber reinforced resin molded product which prevents the curing failure of a fiber reinforced resin molded product by stepwise supplying a reactive resin material so as to divide it into at least two parts to cure the charged reactive resin material almost at the same time. <P>SOLUTION: In this inventive embodiment, all of the necessary reactive resin material Q is not adjusted in its gel time from the beginning but, for example, the reactive resin material Q of which the mount is about 1/3 the necessary amount of the reactive resin material Q (X line in Fig.) is first charged while adjusting a gel time in a necessary time for the impregnation of the whole of the reactive resin material Q and the remainder of a 2/3 amount (Y line in Fig.) of the reactive resin material Q is stepwise charged over several times by calculating the residual time necessary up to the impregnation of the whole and adjusting the gel time short. A gel time adjusting method is performed by an accelerator or a curing agent. However, when the gel time is adjusted by the curing agent, the gel time is preferably adjusted with a range not largely changed in physical properties. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for producing a resin molded product, and more specifically, a reaction resin material is used at least twice in a resin transfer molding method (RTM: Resin Transfer Molding) or a vacuum resin transfer molding method (VaRTM: Vacuum Bag Resin Transfer Molding). It is related with the manufacturing method of the fiber reinforced resin molding which improves the poor hardening of a resin molding by supplying in steps divided above.

  Conventionally, when a resin molded product such as a fiber reinforced plastic (FRP) sheet is manufactured by a resin transfer molding method (RTM) or a vacuum resin transfer molding method (VaRTM), the resin molded product has a shape (size) that can be fitted into an autoclave. Except for, a fiber reinforced base material such as glass fiber and a mat material such as a net are sequentially laminated on a metal mold such as iron, and then a release agent is applied, and the whole is covered with a film-like vacuum back, A method is known in which a reactive resin material is supplied to a laminate and impregnated and cured while the laminate in a vacuum bag is vacuumed (see, for example, Patent Document 1).

  By the way, in the molding method as described above, when adjusting the gel time of the reactive resin material, a necessary amount of resin is prepared in advance, and the entire gel material is charged with an accelerator or a curing agent before being charged. Was adjusting.

  However, if the resin charging time is a long time of 1 hour or more, a time error is likely to occur in the gel time due to the influence of the ambient temperature, weighing error, etc., so that the resin near the charging port is cured before the entire impregnation, and the resin May be difficult to continue.

In addition, if the gel time is made sufficiently long for safety, curing may be caused by a shortage of curing agent or accelerator, and conversely, if the gel time is adjusted to the impregnation completion time, the time for the resin to touch the air becomes long. As a result, the viscosity of the resin increases and the flow of the resin after charging may deteriorate, and there is a problem that it is difficult to adjust the gel time in RTM molding for a long time exceeding 1 hour.
JP 2003-39455 A

  The present invention has been devised by paying attention to such a conventional problem, and the reaction resin material that has been introduced is cured at substantially the same time by supplying the reaction resin material in stages at least twice. It is an object of the present invention to provide a method for producing a fiber-reinforced resin molding that prevents poor curing of the resin molding.

  In order to achieve the above object, the present invention lays a rubber-like elastic sheet on a metal base member, and after laminating at least one layer of a mat material and a fiber-reinforced base material on the rubber-like elastic sheet, The whole is covered with a film-like vacuum back, and when the reaction resin material is supplied in a state where the laminated body in the vacuum back is vacuumed, the reaction resin material is supplied in stages at least twice, The gist is to sequentially impregnate and cure the reaction resin material in the laminate.

  Here, the reaction resin material to be supplied after the second time is supplied by shortening the gel time stepwise, and a core material is interposed between the fiber reinforced base materials of the laminate, and further the base member However, a metal mold or a metal plate is used.

According to the present invention, a rubber-like elastic sheet is laid on a metal base member as described above, and at least one mat material and a fiber-reinforced base material are sequentially laminated on the rubber-like elastic sheet, When the reactive resin material is supplied in a state where the laminated body in the vacuum bag is vacuumed, the reactive resin material is divided into at least two steps and supplied in stages. Since the reactive resin materials are sequentially impregnated and cured, the following excellent effects can be obtained.
(A) The reaction resin material is supplied in stages at least twice, and the gel time is gradually reduced according to the number of times the reaction resin material is charged, so that an RTM for a long time, particularly 1 hour or more. Also in molding, early curing near the input tube can be prevented.
(B) Moreover, since it is added and added, the time during which the reactive resin material is in contact with the air can be shortened, and the flow of the resin is improved throughout.
(C) The curing reaction can be started simultaneously with the impregnation of the reaction resin material into the entire laminate, and defective curing of the resin molded product can be effectively prevented.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a partially enlarged cross-sectional view of a vacuum resin transfer molding apparatus in which a method for producing a fiber reinforced resin molded product such as fiber reinforced plastic (FRP) is performed, and FIGS. 2A to 2D are views of a resin molded product. The process explanatory drawing of a manufacturing method is shown, and the embodiment of this invention demonstrates the case where the resin molding W of the shape (size) which does not enter into an autoclave is manufactured.

  In the present invention, first, a rubber sheet having elasticity and smoothness and heat insulation as shown in FIG. 2 (b) on a metal base member 1 comprising a metal mold or metal plate shown in FIG. 2 (a). Alternatively, a rubber-like elastic sheet 2 such as a polyurethane sheet is laid.

  Next, as shown in FIG. 1, a mat material 3 such as a net material, a fiber reinforced base material 4 such as glass fiber, a core material 5 such as urethane, a fiber reinforced base material 4, a net material, etc. The mat members 3 are sequentially laminated and laid. Then, as shown in FIGS. 2 (c) and 2 (d), the entire laminated body thus formed is covered with a film-like vacuum back 8 in which the resin material inlet 6 and the vacuum pipe 7 are arranged at a part of the periphery. The peripheral edge is sealed on the base member 1 with an adhesive tape 9 or the like.

  Thereafter, the laminated body in the vacuum back 8 is vacuumed by a vacuum pump P connected to the vacuum piping 7, and the laminated body is cured at room temperature from the resin material inlet 6 connected to the resin material supply tank 10 in a vacuum state. A mold type reaction resin material Q (for example, a thermoplastic material such as vinyl ester) is supplied and impregnated and cured by reaction heat of the reaction resin material Q.

  In the embodiment of the present invention, not all of the necessary reaction resin material Q is adjusted from the beginning, but, for example, as shown in FIG. 3, the required amount is about 1/3 (X line in the figure) at the beginning. The reaction resin material Q is charged after adjusting the gel time by the time required for the entire impregnation, and the remaining 2/3 (Y line in the figure) of the reaction resin material Q is calculated by calculating the remaining time required for the entire impregnation. In a stepwise manner, the gel time is adjusted to be short and then divided into several times.

  In addition, the adjustment method of a gel time is performed with an accelerator or a hardening | curing agent. However, when adjusting with a hardening | curing agent, it is preferable to adjust in the range which a physical property does not change a lot.

  Moreover, it is also possible to carry out without interposing the core material 5 such as urethane between the fiber reinforced base materials 4.

  Conventionally, the gel time was adjusted before all of the required amount of resin was charged in advance, whereas in the embodiment of the present invention, the reaction resin material was supplied in stages in at least two steps, and the reaction was performed. By shortening the gel time stepwise according to the number of times the resin material is charged, early curing in the vicinity of the charging tube can be prevented even in RTM molding for a long time, particularly 1 hour or more.

  In addition, since it is added and added, the time for the reaction resin material to contact the air can be shortened, the flow of the resin is improved from beginning to end, and further, the reaction resin material is impregnated throughout the laminate and cured. The reaction can be started, and defective curing of the resin molded product can be effectively prevented.

  Moreover, since the rubber-like elastic sheet 2 also has a release effect on the resin material, it is not necessary to apply a release agent in advance, and the resin molded product W can be released or released smoothly from a metal mold or metal plate. I can do it. As a result, productivity can be improved.

It is a partial expanded sectional view of the vacuum resin transfer molding apparatus which implemented the manufacturing method of the fiber reinforced resin molding of this invention. (A)-(d) is process explanatory drawing of the manufacturing method of a resin molding. It is explanatory drawing of the injection method of the reaction resin material of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base member 2 Rubber-like elastic sheet 3 Mat material 4 Fiber reinforced base material 5 Core material 6 Resin material inlet 7 Vacuum piping 8 Vacuum back 9 Adhesive tape 10 Resin material supply tank W Resin molding Q Reaction resin material P Vacuum pump

Claims (4)

A rubber-like elastic sheet is laid on a metal base member, and at least one or more mat materials and fiber-reinforced base materials are sequentially laminated on the rubber-like elastic sheet, and then the whole is covered with a film-like vacuum back. When the reaction resin material is supplied in a state where the laminate in the vacuum back is vacuumed, the reaction resin material is supplied in stages at least twice, and the reaction resin material is sequentially impregnated and cured to the laminate. A method for producing a fiber-reinforced resin molded product. The method for producing a fiber-reinforced resin molded product according to claim 1, wherein the reactive resin material supplied after the second time is supplied with a gel time shortened stepwise. The manufacturing method of the fiber reinforced resin molding of Claim 1 or 2 which makes a core material interpose between the fiber reinforcement base materials of the said laminated body. The method for producing a fiber-reinforced resin molded product according to claim 1, wherein the base member is a metal mold or a metal plate.

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