JPH01110129A - Resin molded body for vehicle - Google Patents

Abstract

PURPOSE:To obtain strength and flexibility and to prevent the scattering of broken pieces at the time of the destruction of a resin molded body, by interposing a fabric, wherein a region impregnated with a resin and mutually bonding upper and lower resin layers and a region impregnated with no resin and not bonding said upper and lower resin layers are alternately formed, between the resin layers of the resin molded body. CONSTITUTION:Each of the upper and lower glass cloth layers 111, 112 constituting an engine hood 10 is formed by laminating a plurality of resin layers each obtained by impregnating a glass fiber with an epoxy resin. A fabric 12 having flexibility composed of a glass fiber, an aramid fiber, a carbon fiber or a combination thereof easy to be impregnated with the resin to be infiltrated in the glass fiber and two resin tapes 13 holding the fabric 12 therebetween are interposed between the upper and lower glass cloth layers 111, 112. A large number of holes 131 permitting the impregnation of the fabric 12 with the resin are provided to the tapes 13. Therefore, only the regions corresponding to the holes 131 of the fabric 12 are impregnated with the resin at the time of the manufacturing of the engine hood, and the resin impregnated parts and the resin non- impregnated parts are alternately arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a resin molded article for a vehicle using fiber-reinforced plastic or the like.

B. Conventional technology In order to reduce the weight of vehicles, bonnets and door guard bars are sometimes made of fiber-reinforced plastic (FRP), etc.
No. 219165).

This type of FRP generally uses fibers impregnated with resin, so it has high strength but lacks flexibility against bending and twisting, ■ has low energy absorption, and ■ is used for vehicle parts because the load decreases rapidly when it breaks. When used as a vehicle, consideration must be given to preventing scattering during destruction and transmitting a certain amount of force to the vehicle body upon destruction.

Problems to be Solved by the C0 Invention Therefore, if a fabric made of fibers not impregnated with resin is simply interposed in FRF', the fabric will have flexibility because it is not impregnated with resin, but the fabric and resin will not be impregnated. There is a problem in that the fabric is left unbonded and the resin layer is not prevented from scattering when it is broken.

An object of the present invention is to provide a resin molded article for a vehicle that has improved scattering prevention effect while ensuring strength.

The first invention will be explained with reference to FIG. 1 showing an embodiment of means for solving the D0 problem.
The first invention is applied to a resin molded body for a vehicle, which is formed by laminating a plurality of glass cloth layers 111 and 112 as resin layers in which resin is applied to fibers impregnated with resin. The above-mentioned problem is that the fabric 12 made of fibers impregnated with resin is interposed between either of the glass cloth layers 111 and 112, and the fabric 12 is impregnated with resin on the upper and lower surfaces of the fabric 12. The area where the upper and lower glass cloth layers 111 and 112 are bonded to each other and the upper and lower glass cloth layers 1 without being impregnated with resin
This problem can be solved by alternately forming regions 11 and 112 that are not bonded.

The second invention will be explained with reference to FIG. 8 showing one embodiment.
The second invention is applied to a resin molded body for a vehicle in which a plurality of glass cloth layers 211 and 212 are laminated as resin layers in which resin is applied to fibers impregnated with resin. The above-mentioned problem is solved by interposing the fabric 22 in which fibers impregnated with resin and fibers not impregnated with resin are alternately woven between either of the glass cloth layers 211 and 212.

E0 effect In the first invention, when the fabric 12 is interposed between the lamination of the glass cloth layers 111 and 112, the upper and lower surfaces of the fabric 12 are impregnated with resin, and the upper and lower glass cloth layers 111, 112 are impregnated with resin.
112 are bonded to each other and areas where the upper and lower glass cloth layers are not impregnated with resin are formed alternately, so the area impregnated with resin ensures strength, and the area where resin is not impregnated ensures the strength of the glass cloth. Cross layer 111°11
This prevents fragments from scattering when the item 2 is destroyed.

In the second invention, the fabric 22 in which resin-impregnated fibers and non-resin-impregnated fibers are alternately woven is interposed in the lamination of the glass cloth layers 211 and 212, so that the same effects as in the first invention can be obtained. can get.

F. Embodiment 1 Embodiment of the first invention - An embodiment in which the first invention is applied to an engine hood of an automobile will be described based on FIGS. 1 to 3.

Fig. 1 is an exploded perspective view schematically showing an engine hood that is a resin molded body, Fig. 2 is a perspective view showing the external appearance of the engine hood, and Fig. 3 is a cross-sectional view taken along line mm in Fig. 2. It is.

The upper and lower glass cloth layers 111 and 112 (resin layers) constituting the engine hood 10 are formed by laminating a plurality of resin layers made of glass fibers impregnated with an epoxy resin. Upper and lower glass cloth layers 111, 112
In between, a fabric 12 having a flexibility of 4- is made of any fiber such as glass fiber, aramid fiber, or carbon fiber that is easily impregnated with the resin to be impregnated into the glass fiber, or a combination of a plurality of fibers; This fabric 12 is sandwiched between two resin tapes (for example, vinyl tape) 13 (duct tape may also be used).
is interposed. The tape 13 has a plurality of holes 131 that allow the resin to impregnate the fabric 12. During the engine hood manufacturing process, the resin passes through these holes 131 and impregnates the fabric 12, and also impregnates the upper and lower glass cloth layers. 111,1
12 is adhesively bonded through this hole 131. Therefore, the entire area of the fabric 12 is not impregnated with resin, but only the areas corresponding to the holes 131 are impregnated with resin, and resin-impregnated parts and non-impregnated parts are arranged regularly and alternately. In addition, the upper and lower tapes 1
Tape the upper and lower tapes 13 so that the positions of the holes 131 of 3 match.
It is preferable to position them and then attach them to the upper and lower surfaces of the fabric 12.

As a method of forming the engine hood 10 having such a structure,
There are hand lay-up methods, bag methods, cold press methods, resin injection methods, etc., and here, as an example, a molding procedure using the hand lay-up method will be explained.

First, a release agent is applied to the mold, and then a gel coat is applied on top of it. As the mold release agent, wax type agents such as solid wax and silicone wax are mainly used. Thereafter, glass cloth made of glass fibers impregnated with epoxy resin is laminated and pressed with a roller. In addition to epoxy, impregnated resins include unsaturated polyester, vinyl ester,
A resin such as phenol may also be used. The upper glass cloth layer 111 is formed by repeating this lamination of glass cloth and roller pressing until a predetermined thickness is achieved. Next, the fabric 12 on which the tape 13 has been positioned and pasted on the upper and lower surfaces is laminated, and the glass cloth is laminated on top of the fabric 12 and the roller pressing is repeated in the same manner until a predetermined thickness is reached. A glass cloth layer 112 is formed. As a result, the resin passes through the holes 131 of the upper and lower tapes 13 and impregnates the fabric 12 from above and below.
Combined with the fabric 12, the upper and lower glass cloth layers 1
11.112 are adhesively bonded together.

The engine hood 10 produced by the above-described molding method has a flexible fabric 12 in which regions impregnated with resin and regions not impregnated with resin are regularly arranged by tape 13 between upper and lower glass cloth layers 111 and 112. It is constructed by intervening. Therefore, the area impregnated with resin ensures strength, and the area not impregnated with resin provides flexibility, and when the glass cloth layer breaks, the fibers in the area not impregnated with resin hold the decomposed fragments together. This prevents it from scattering. Further, the regions impregnated with the resin and the regions not impregnated with the resin may be formed in a staggered manner, or either of the two regions may be formed in a lattice shape. In this case, it is better to form a large number of regions impregnated with resin and regions that are not impregnated with resin, or to form them in a shape that is intricately intertwined with each other, in order to prevent the resin from scattering even if it is broken down into small pieces. selected.

Note that when the mold 51 shown in FIG. 4(a) is placed on the upper and lower surfaces of the resin-impregnated fabric 52 (FIG. 4(b)) and a mold release agent is applied, the mold is released at the holes 511 of the mold 51. Since the agent is fixed to the upper and lower surfaces of the fabric 52 and these parts are not impregnated with resin, this fabric 52 is applied to the upper and lower glass cloth layers 11 in the same manner as described above.
A similar resin molded body can be produced even if it is interposed between 1 and 112.

Further, FIGS. 5(a), (b), and 6 show an example in which the first invention is applied to a door guard bar, in which a square or rectangular shape is formed on a fabric 31 made of resin-impregnated fibers in the same manner as described above. Resin-impregnated areas and non-impregnated areas are provided regularly and alternately, and the upper and lower glass cloth layers 11 are formed by the method described above.
1 and 112 (FIG. 1) to obtain the same effect.

Note that the fibers of the glass cloth may be in the form of a filler or a fabric. Further, instead of glass cloth, a resin layer using aramid fiber or carbon fiber may be used.

-Second Embodiment- An embodiment in which the second invention is applied to a front fender of a vehicle will be described based on FIGS. 7 to 9.

7 is a perspective view showing the front fender 20, FIG. 8 is a perspective view schematically showing the front fender 20 in an exploded manner, and FIG. 9 is a sectional view taken along the line ■--■ in FIG. 7.

As described above, the upper and lower glass cloth layers 211 and 212 are formed by laminating a plurality of glass cloths made by impregnating resin-impregnated glass fiber fabrics that are easily impregnated with resin. This upper and lower glass cloth layer 211, 212
A flexible fabric 22 is interposed between them. The fabric 22 is made by alternately weaving fibers that are easily impregnated with resin and fibers that are difficult to impregnate with resin in every other row or every plural rows. Fibers that are easily impregnated with resin include glass fibers, carbon fibers, and aramid fibers that have been treated to be easily impregnated with resin. Fibers that are difficult to impregnate are polyethylene, unsaturated polyester, high-strength polyester, etc. Aramid fibers or the like that have not been subjected to oxidation treatment or chemical treatment to facilitate impregnation are used. These fibers may be used alone or in combination.

The upper and lower glass cloth layers 211 and 212 are made of fabric 22.
However, the fabric 22 has fiber portions impregnated with resin and fiber portions not impregnated with resin, which are arranged alternately. Therefore, as mentioned above, strength is ensured by the part impregnated with resin, flexibility is obtained by the part not impregnated with resin, and when the glass cloth layer breaks, the fibers in the part not impregnated with resin decompose. Debris can be held together, preventing it from scattering. Further, unlike the first invention, there is no need to attach tape or the like to the fabric.

Although the example in which only one layer of the fabric 12 or 22 is interposed has been shown above, it is also possible to interpose a plurality of layers. In this case, it is necessary to increase the thickness compared to the case of one layer to ensure strength.

As shown in FIG. 10, knots 3 are provided at each knot of a fabric 2 made of fibers 1 such as acrylic which are not impregnated with resin in a mesh pattern, and this fabric is interposed between the above-mentioned glass cloth to improve its flexibility. In addition, when the glass cloth layer is broken, the fragments may be mechanically caught on these bumps 3 to prevent them from scattering.

G0 Effect of the Invention According to the first invention, there is a region between the resin layers of a resin molded body that is impregnated with resin to bond the upper and lower resin layers to each other and a region that is not impregnated with resin and does not bond the upper and lower resin layers. Since the fabric is interposed with alternating regions, the resin-impregnated regions ensure strength, the non-resin-impregnated regions provide flexibility, and prevent fragments from scattering when the resin molded object breaks. be done.

According to the second invention, a fabric in which fibers impregnated with resin and fibers not impregnated with resin are interwoven alternately is interposed between the resin layers of the resin molded body, so that the first invention can be carried out without attaching tape or the like to the fabric. The same effect as the invention can be obtained.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the first invention, and FIG. 1 is an exploded perspective view schematically showing an engine hood;
Fig. 2 is a perspective view showing the external appearance of the engine hood, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, and Figs. 4 (a) and (b) show another example of the resin molding process. Figure 5(a), (
b) and FIG. 6 show other embodiments in which the first invention is applied to a door guard bar, and FIG. 5(a) shows another embodiment in which the first invention is applied to a door guard bar.
FIG. 5(b) is a sectional view taken along line bb--FIG. 6 is a perspective view of another door guard bar. 7 to 9 show an embodiment of the second invention, FIG. 7 is a perspective view showing the appearance of the front fender, FIG. 8 is an exploded perspective view schematically showing the front fender, 9th
The figure is a sectional view taken along the line IX-IX in FIG. 7, and FIG. 10 is a diagram showing a modification. 12.22: Fabric 13: Tape 111.211: Upper glass cloth layer 112.212: Lower glass cloth layer

Claims (1)

[Scope of Claims] 1) In a resin molded article for a vehicle comprising a plurality of laminated resin layers in which resin-impregnated fibers are coated with resin, between the plurality of resin layers, there is a layer formed from the resin-impregnated fibers. The upper and lower surfaces of this fabric are alternately divided into areas where the resin is impregnated into the fabric to bond the upper and lower resin layers to each other and areas where the resin is not impregnated and the upper and lower resin layers are not bonded to each other. A resin molded article for a vehicle, characterized in that it is formed in the following manner. 2) In a resin molded article for a vehicle comprising a plurality of laminated resin layers in which fibers impregnated with resin are coated with resin, fibers impregnated with the resin and fibers not impregnated with the resin are alternately arranged between the plurality of resin layers. A resin molded article for a vehicle, characterized in that a woven fiber member is interposed therein.