JPS61195825A - Frp molding material and frp bend molding method making use of this material - Google Patents

Abstract

PURPOSE:To obtain easily an FRP molded member partly having a shape other than a linear one, by making the same contain a resin-uncured part or resin- unimpregnated part. CONSTITUTION:Although a glass roving 2 of a wound bundle 1 is introduced into a resin impregnation tank 3 or 3' and impregnated with thermosetting resin, when the roving (part necessary to be bent) of a target part is passed, an immersion roll is ascended and it is made not to impregnate with the resin. The roving like this is dispersed, oriented at equal intervals through an orientation plate 4 and introduced into a heating mold 6 through a squeezing mold 5. This glass fiber base 7 is pulled out from a heating mold 6 under a cured state excepting that a part impregnated with the resin to which polymerization inhibitor has been added becomes an uncured part 8. As for quarter-round press molds 10, 11 pressing and heating the uncured part 8, when the uncured part 8 arrives at the position, pressing and heating are kept on while the same is being moved by interlocking with a pulling-out speed. Simultaneously with completion of bend molding a molded material is cut off by a cutter 12 and a process is completed.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a long rod-shaped or tubular glass fiber-reinforced glass molding material having an uncured resin portion or an unimpregnated portion, and a molding material using the same. The present invention relates to a method of manufacturing an F'RP molded body having a bent part.

BACKGROUND OF THE INVENTION Long glass fiber-reinforced plastics having a constant cross-sectional shape, such as a rod or a tube, are widely used as general-purpose materials.

The most suitable manufacturing method for this is the continuous pultrusion method, which has extremely high productivity, but this manufacturing method generally only allows for the production of straight-shaped molded products, and is somewhat limited by its intended use. It was something. The present invention relates to a molding material and a molding method using the same, for easily obtaining a long rod-shaped or tubular glass fiber-reinforced plastic molded product having a partially bent portion by a highly productive continuous pultrusion method. It is related to.

[Prior art]

Traditionally, the filament winding method and the continuous pultrusion method have been well known as methods for producing glass fiber-reinforced plastic molded bodies in the shape of long straight rods or tubes, but the filament winding method requires special shape,
For example, it is advantageous to obtain a molded body having a bent part or a molded body whose cross-sectional shape differs depending on its position in the longitudinal direction, but the productivity is poor. Because it cannot be used, it has the disadvantage of low tensile strength in the longitudinal direction.

On the other hand, the continuous pultrusion method allows for continuous production when obtaining a long molded article with a constant cross-sectional shape, and therefore has extremely high productivity and is an optimal method for producing general-purpose materials. The key point of this molding method is that nine glass fibers impregnated with a thermosetting resin are continuously introduced into a heating mold for molding having a desired cross-sectional shape, continuously drawn and molded, and then the desired shape is formed. The method is to cut it to length.

In this method, since the drawing direction is in a straight line from the mold to the thermosetting furnace, only a linear shaped body can be obtained. In order to solve this problem, a method has been proposed in which the mold itself is configured to have a desired curvature, but this method only yields a continuous molded body with a constant curvature, and only a part of the molded body has a bent part. It is not possible.

Considering this purpose alone, it is possible to use the dry-up and press-forming methods, but the productivity of the dry-up method is extremely low, and both molding methods require a mold that covers the entire molded product. Therefore, it is not suitable as a method for obtaining a long molded body having only a part of it bent.

[Specific Means for Solving the Problems] The present invention eliminates the drawbacks of the above-mentioned conventional methods.

That is, the first aspect of the present invention is an FRP molding material characterized by having an uncured resin portion or a non-resin impregnated portion in a long FRP molded body obtained by continuous pultrusion molding.

Further, the second aspect of the present invention @5 is a method of obtaining a molded article having a bent portion using the molding material.

In other words, the second uninvented method is to introduce a resin-impregnated fiber base material into a heating mold in a continuous pultrusion method, pull it out from the heating mold with uncured portions left at regular intervals, and then remove the uncured portions. This is an FRP bending method characterized by hot pressing and molding using a mold of a desired shape.

And, in the continuous pultrusion method, i@5 of the present invention
A resin-impregnated fiber base material having resin-unimpregnated parts at regular intervals is introduced into a heating mold, pulled out from the heating mold, and then the resin-unimpregnated parts are molded into a desired shape by resin injection. This is the FRB bending method.

In the second aspect of the invention, the following method can be used to pull out the mold from the heated mold while leaving the uncured portion.

■ A method in which only the desired area is impregnated with resin containing a polymerization inhibitor to prevent gelation due to heating within the mold.

■ A method to prevent gelation due to heating in the mold by increasing the molding speed (pulling speed) only for the desired part.

Further, in the fifth invention, as a method for obtaining a cured product containing a resin-unimpregnated portion, there are the following methods.

■ A method that does not immerse only the desired part in the impregnation tank.

■ Method of protecting only the desired area with masking tape and impregnating it.

■ After the resin has been deposited, only the desired area is cleaned with a solvent such as acetone to remove the resin.

Next, a method for obtaining a rod-shaped body having a 90° bend according to the second aspect of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a schematic plan view showing one example of the apparatus used to carry out the invention, l is a bundle of crow rovings;
The glass roving 2 is introduced into a resin impregnation chamber 3 or 3' and impregnated with thermosetting resin. 31 is filled with resin to which a polymerization inhibitor has been added. Normally, a dipping roll (not shown) waits above and rolls the roving of the desired part (the part that requires bending) without impregnating the resin. As it passes, the dip roll is lowered and impregnated with resin. On the other hand, in resin impregnation #3, the dipping roll (not shown) is normally lowered to impregnate the resin, but when the roving (required bending part) of the target part passes, the dipping roll to prevent it from rising and impregnating the resin.

The roving impregnated with resin in this way is dispersed and oriented at equal intervals by an orientation plate 4 in which a large number of holes are provided at regular intervals, and then heated through a squeeze mold 5 to remove excess resin. It is introduced into a mold 6 for use.

The resin-impregnated glass fiber base material 7 heated in the heating mold 6 is completely cured except for the part impregnated with the resin to which the polymerization inhibitor has been added, which becomes the uncured part 8.
more drawn out.

9 is a pulling device for pulling out the cured product.

10.11 is 174 for press heating the uncured part 8
It is a circular press mold and indicates the standby state.

When the uncured s8 reaches that position, it is activated and continues press heating while moving to the right in conjunction with the drawing speed.

10' and 111 are the press molds showing the state at the end of press heating, and the press molds 10' and 111 are turned on again at the same time as the bending is completed. The molded body returns to the position If, and the molded body is cut by the cutter 12 provided at the desired position, thus completing one process.

Above, an example using a polymerization inhibitor has been described in detail for g2 of the present invention, but basically the same operation can be performed for the method of shortening the time for passing an uncured portion through a heating mold and for 533 of the present invention. Bye.

In this method, the FRP molding material according to the first aspect of the present invention can be obtained by cutting the molded body to a desired length before applying the press mold or the resin injection mold. can.

In the present invention, the reinforcing fibers are not limited to glass fibers, but may also be carbon fibers, organic fibers, gold F4 fibers, etc., and their shapes are not limited to rovings, mats, cloths, etc. Furthermore, it is of course possible to wind it not only in the length direction but also in the circumferential direction. The resin to be used is not particularly limited, but examples include resins obtained by adding carbonized calcium, organic peroxide, and wax as a mold release agent to general unsaturated polyester resin. In addition, as polymerization inhibitors, 100-nones, polyhydric phenols, etc. can be used, and the amount added is 0.01 to 5
The amount is preferably about 1 part by weight, more preferably 0.02 to 1 part by weight.

In addition, the temperature of the heating mold depends on the type of resin, the length of the heating mold,
It depends on the pulling speed, but in general! A temperature of about 20 to 150°C is selected.

There is no particular limit to the drawing speed, but it is usually 0.5 to s, O
m/min aK.

Naturally, the first molding material of the present invention can be molded into a second molding material in the same process.
According to the third invention, it is possible to obtain an FRP molded body having continuous bent portions, or it is of course possible to use the molded body as a product as it is. In this case, it can be molded into a desired shape by the user by press molding, roll molding, resin injection molding, etc., and can be used for a wide variety of purposes.

Further, when bending is performed in the present invention, it is not limited to a rod shape, but by using a mandrel, a tubular body can also be formed, and the bending thin shape is not limited to 90° but can be widely applied.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Shima Example 1 Using the device shown in Figure 5g1, a 20 mm φ rond with a 90° bend S in the center (straight section 1ffl).

The bending part was 8 crn and the straight part was 5 IFF.

The roving used was No. 4620, and the resin impregnation tank 5 contained 100 mt of unsaturated polyester and l calcium carbonate.
Parts by weight of O, double fi parts of styrene polymer, 5 parts by weight of carnauba wax, 4 parts of BPO as a hardening agent, and 15 parts of resin gold. 51 was filled with a resin having a composition of 0.1 x tst of hydroquinone added to the above resin as a polymerization thread stopper, the drawing speed was set to 0.5 m/min, and in the resin tank 5, after being impregnated for 4 minutes, Raise the dipping roll for a second to avoid impregnation with the resin, and for resin N5', after impregnating it for 10 seconds, it is heated to 130°C without impregnating for 4 minutes, and the length of 500-
1 was introduced into a heating mold with an inner diameter of 20fi. The cured product pulled out from the mold was completely cured over a length of 2 m, and had 8 uncured parts in a B-stage state.

A 90° curved press mold 1O111 having a semicircular cross section with an inner diameter of 2011110 and a length of 1OcIR, which was heated to 130°C and was heated to 2m to the right of the heating mold, was placed on standby, and when the uncured part reached the 9th point, they were activated simultaneously. The press was moved 0.5 m to the right at the same speed as the drawing speed, and after 60 seconds, the press was released and returned to the standby state, and the cutter located 1.5 m to the right of the heating mold was activated to perform cutting. About 2.
An L-shaped rod having a length of 1 m and a central portion bent at 90° was obtained. 1
The time required to complete the process was 4 minutes. The physical properties of the obtained molded article are shown in Table 1.

igl Table Example 2 Device 1'f without 3' in Fig. 1: used, drawing speed K
t O, 5m/min for 4 minutes, t m/min f
e A molded body was obtained in the same manner as in Example 1 except that the repetition was repeated for 5 seconds. The physical properties of the obtained molded product are shown in Table 1.9.

Example 5 In Fig. 1, using a device without a deformation, the resin impregnation in step 3 was continued for 4 minutes, and then the resin impregnation was not carried out for 10 seconds, and this was repeated. Molding was carried out in the same manner as in Example 1, except that a resin injection mold of the same size was used, and a resin of the same composition was injected from the resin injection port provided in the mold. The physical properties of the obtained molded product are shown in Table g1.

Example 4.5 In Example 3, the resin impregnation in 3 was continued.

Wash and remove the impregnated resin using acetone over a length of 8 pores at 2 m intervals (Example 4), or wrap the rovings with cellophane tape at 2 m intervals to a length of about 81:1 IFm. After continuing to impregnate the masked roving with resin, molding was carried out in the same manner as in Example 3, except that the tape was removed (Example 5). Table 1 shows the physical properties of the molded product obtained.

〔Effect of the invention〕

According to the present invention, since the molding material has an uncured resin part or an unimpregnated part tV with resin, it is possible to easily obtain an FRP molded article having a part with a shape other than a straight line.
It is extremely economical because the mold can be small. Furthermore, by using such a forming material, a long rod-shaped or tubular F'RP having a partially bent part can be obtained continuously and extremely efficiently, and conventional pultrusion equipment can simply produce only the bent part. This is an extremely economical method because it can be molded simply by adding a small press device or an injection pupil.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one example of an apparatus used to carry out the present invention.

Claims (3)

[Claims] (1) A material for FRP molding, characterized in that it has an uncured resin portion or a non-resin impregnated portion in a long FRP molded body obtained by continuous pultrusion molding. (2) In the continuous pultrusion method, a resin-impregnated fiber base material is introduced into a heating mold, and is pulled out from the heating mold with uncured portions remaining at regular intervals.Then, the uncured portions are shaped into the desired shape. An FRP bending method characterized by hot pressing and shaping using a mold. (3) In the continuous pultrusion method, a resin-impregnated fiber base material having non-resin-impregnated parts at regular intervals is introduced into a heating mold, pulled out from the heating mold, and then the resin-unimpregnated parts are molded into the desired shape by resin injection. FRP bending method characterized by forming into a shape.