JPS59167230A - Preparation of molded material - Google Patents

Abstract

PURPOSE:To enable long FRP cylindrical molded material to be prepared with a simplified cantilever structure by fixing a fiber reinforcing material supplier, a liquid thermosetting resin supplier and a compression roller device to a cantilever body. CONSTITUTION:A cylindrical molded body A is revolved by a roller 5 transmitting the drive-force of a motor 2. Resin and fiber reinforcing material are supplied from the fitting portion C of a molding material supplier and a compression roll mounted on the cantilever body B into the inner surface of a revolving mold, and directly after that compressed by a compression roller D. In that case, the mold body A moves forward and backward for the promotion of molding in accordance with the supply of the molding material from the fitting portion C of the molding material supplier and the compression roll. The speeds of revolution and longitudinal movement of the mold body A are selected suitably by speed change gears 3, 6 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a fiber-reinforced thermosetting resin (hereinafter referred to as FRP) cylindrical molded article.

Low-speed rotary molding of FRP cylindrical moldings is described in Japanese Patent Application Laid-open No. 54-11.
1577. That is, using a device in which a sliding part is provided on a cantilever beam body so that the cylindrical mold does not move in the direction of the rotation axis and the FRP molding material delivery part can move relative to each other, the mold is 4 rpm (peripheral speed 5~10r
rL/min), a suppression roller is installed parallel to the rotation axis direction of the mold, the rotation of the mold and the rotation of the suppression roller are synchronously rotated from the drive unit using a chain and a wheel, and the suppression roller is rotated by an air cylinder. A molding method has been proposed in which the reinforcing material is impregnated with resin and defoamed while adjusting the reinforcing material by moving it up and down, that is, by pressing or releasing pressure.

However, in this forming method, the molding material supply device and the suppression roller move along the guide rails on the side of the cantilevered beam, which changes the bending moment acting on the beam, which causes the beam to deflect. arise. This knowledge makes it impossible to keep the suppression roller connected to the guide rail installed on the cantilever beam body horizontally, resulting in uneven thickness and
This causes the molding material to become entangled with the suppression roller.

In addition, in this method, when the material supply device is moved from the leading end to the rear end with the material supply stopped, the fiber reinforcement material is long fibers before being cut with a cutter on the device, so it becomes sagging. Problems such as getting entangled with the part 0 or coming into contact with the mold surface occur. Furthermore, since the conduit for transporting the liquid thermosetting resin needs to have a telescopic structure, the inside of the conduit cannot be completely cleaned. Moreover, since the structure is complicated, the number of conduits is limited.

Furthermore, this method requires the mold to be perfectly circular because the suppression roller rotates in synchronization with the rotation of the cylindrical mold by means of a chimney motion, and is suitable for manufacturing molded products with shapes other than perfect circles, such as ellipses, missing circles, and polygons. is not suitable. Moreover, since the suppression roller is rotated in synchronization with the mold, there is a drawback that molding becomes difficult if the molding material becomes entangled with the roller.

The present inventors conducted extensive research to improve these drawbacks, and as a result, they arrived at the present invention.

That is, the present invention rotates with a centrifugal force less than twice the gravity,
A fiber reinforcing material supply device and a liquid thermosetting resin are fixed to a detachable beam body located in the mold interior space, and a fiber reinforcing material supplying device and a liquid thermosetting resin are applied to the inner wall surface of a cylindrical mold that reciprocates in the axial direction. The resin is supplied by a resin supply device, and then the upper reinforcing material and the resin are pressed by at least one press roller fixed to the cantilever beam body and freely rotated to impregnate and remove dirt. A method for manufacturing a molded article is provided.

In the present invention, the structure of the cantilever beam can be simplified by fixing the fiber reinforcement supply device, the liquid thermosetting resin supply device, and the suppression roller device 4 to the cantilever beam. Can increase body length. This makes it possible to manufacture a long FRP cylindrical molded product. In addition, each conduit for transferring the fiber reinforcement material and liquid thermosetting resin to each supply device can be fixed, eliminating the need for an expandable mechanism, and in addition, it is possible to significantly reduce the weight.

Incidentally, since the liquid thermosetting resin supply device can have a mechanism for mixing just before or after the discharge port, the catalyst, accelerator, etc. can be completely mixed.

The cylindrical mold used in the present invention is preferably one that can be opened and closed in at least two parts, as shown in FIG. 1, and is tightened into an integral cylindrical shape using bolts. The mold is rotated, for example, by multiple transmission rollers driven by a motor. The rotational speed of the cylindrical mold is such that the centrifugal force is less than twice the force of gravity. For example, if it is a cylindrical type with a diameter of 2rrL, it is 30 rp, m.

The rotation speed is as follows. In addition, the cylindrical mold is moved in the axial direction of the mold from 0 to 2 by the cylindrical mold moving device, for example, while lying on the guide rail.
A 6M4 type is used, which can reciprocate at a constant speed or at a variable speed in the range of 0 m/min, and also allows the mold itself to be reversed back and forth using, for example, a guide rail, and the sentence pattern can be rotated both left and right.

Incidentally, the axial movement of the mold may be driven by wheels, or may be driven by wheels, wires, gears, or the like.

As shown in Figure 2, the fiber reinforcement supply device guides and transports the fiber reinforcement material, for example a string-like material, using a rubber roller, and is composed of a rubber roller and a shearing blade roller having radial shearing blades. The fiber reinforced material can be cut and supplied by activation and release, or the fiber reinforced material can be supplied in the form of a string by replacing the shearing blade roller with a roller without shearing blades in Figure 2. What the organization has is used. The amount of supply can be freely selected, and when it is supplied in the form of a string, it can be supplied in parallel spirally in the circumferential direction in synchronization with the circumferential speed, or it can be supplied in a random loop at a higher speed.

It is also permissible to supply a combination of these.

The liquid thermosetting resin supply device mixes the liquid thermosetting resin, curing catalyst, etc. before supplying it to the inner wall surface of the cylindrical mold, as shown in Figure 4, and preferably the liquid thermosetting resin It can be mixed immediately before or after the discharge port.

A method of supplying this device when unsaturated polyester resin is used as the liquid thermosetting resin will be described. Unsaturated polyester resin and accelerator, e.g. 6% naphthenic acid
1) Transfer the mixture to a line mixer using a pump.

In addition, in another line, a catalyst such as 55% methyl ethyl ketone (-oxide (MEKPO)) is transferred to a line mixer using a Q pump. Both are mixed by a line mixer and discharged from a discharge port. It is preferable to have pores on the bottom surface of the tube so that it is discharged in the form of a shower, or it may be discharged in the form of slits or mist.

The pump to transfer unsaturated polyester resin and 55% MEKPO is usually a foot pump, with a transfer ratio of 100:0.2 to 100:5, a set of gears,
Either air pump type or pressure feeding type is available.

In addition, the unsaturated polyester resin, accelerator, and catalyst are transferred through separate lines, and two line mixers (C
It's okay to mix and supply more.

For example, as shown in Figure 4 (IC), the suppression roller rotates freely without being forced to synchronize with the rotating mold, impregnates the reinforcing material with resin by the pressing force of its own weight, and defoams the bubbles in the molding material. It is preferable to provide at least one crank so that it can be carried forward.

For such a suppression roller, 2 Kft is 950 to 400 I per 1 cIrL of roller length, and the length can be freely selected according to the length of the molded product, and usually 10 to 1 [1
A range of 0α is preferable. Further, its diameter may be any size that does not hinder rotation, and is preferably in the range of 5 to 40 m. It should be noted that the suppression rollers preferably have a mechanism that can be moved up and down using an air cylinder, and there are usually three or more rollers, with an interval of 1 to 50 cIIL between each roll, preferably 5 to 20 cIIL.
It is used at about cWL.

The seedling fiber reinforcement used in the present invention is glass fiber, carbon fiber, aramid fiber (Kevlar fiber, manufactured by Teyubon)
Generally known fiber reinforcing materials such as the like can be used, and glass fiber is preferable. The suitable form of this fiber is mat, tape, roving (thread), or chopped strands obtained by cutting the roving into appropriate lengths, preferably 12 to 75 mm, and combinations thereof. It is also possible to configure The content of the fiber reinforcing material in the molded product is 10 to 80% by weight, preferably 20 to 80% by weight.
A range of 60% by weight is suitable.

The liquid thermosetting resin used in the present invention can be a generally known liquid thermosetting resin such as unsaturated polyester resin, vinyl ester resin, epoxy resin, or phenol resin, and preferably unsaturated polyester resin or vinyl ester resin. Resin is used. The viscosity of the liquid thermosetting resin is usually in the range of 0.5 to 20 poise (Brookfield viscosity), preferably 2 to 20 poise.

When an unsaturated polyester resin or a vinyl ester resin is used as the liquid thermosetting resin, a vinyl monomer such as styrene or methyl methacrylate is mixed with the unsaturated polyester or vinyl ester as a constituent component.

Further, naphthene may be added to these resins in advance with a curing aid such as cobalt, octene cobalt, lead naphthenate, or octenolead. Of course, it may also be added when supplying the resin to the rotary mold.

Next, the manufacturing method of the present invention will be explained using an apparatus.

FIG. 1 shows an example of a molding apparatus in which a molding material supply section, a pressing roll, etc. are installed so as not to move in the direction of the rotation axis of the mold, and the mold can move in the direction of the rotation axis. With this device,
A cylindrical molding die A is rotated by a roller 5 that transmits the drive of a motor 2. To attach the molding material supply device and the pressure roll provided on the cantilever beam B, resin and fiber reinforcing material are supplied from part C to the rotating inner surface of the mold, and immediately after being supplied, they are pressed by a pressure roller D. At this time, the molding mold body A is mounted with a molding material supply device and a press roll and is moved forward or backward as the molding material is supplied from the part C to proceed with molding. Further, the speeds of the rotation and back and forth movement of the mold body A are appropriately selected by the respective transmissions 3 and 6.

According to the present invention, it is possible to make the material supply section and the cantilever beam body compact, and it is possible to obtain a long FRP cylindrical molded product having a large diameter to a small diameter, and it is also possible to manufacture irregularly shaped pipes.

Furthermore, a fiber reinforced material such as glass roving can be supplied without being cut, and a high-strength FRP cylindrical molded product can be obtained. Furthermore, since the liquid thermosetting resin and the curing catalyst are completely mixed, an FRP cylindrical molded product with no uneven color can be obtained.

The present invention will be explained using an example.

Example 1 Molding was carried out using a manufacturing apparatus as shown in FIG. 1, in which the mold body A had an inner diameter of 1.8 m and a length of 6 m.

Eight glass fibers (Glass Roving 5P-3, manufactured by Asahi Fiber) were chopped with a length of 50 by the fiber reinforcement supply device installed at the tip of the cantilever beam B with a length of 3.5 mm. Cut it into strands and feed it with a discharge lid at a rate of 4 feeds/minute.
The unsaturated polyester resin (
Polylite FB, -105 (manufactured by Inu Nippon Ink Kagaku Kogyo Co., Ltd.) 100 parts by weight + 6% cobalt naphthenate O, 4i parts) and a catalyst (55% MEKPO) in a proportion of 1.0 parts by weight of catalyst per 100 parts by weight of resin. The mixture was mixed in proportions and fed onto the glass fibers in a shower at a discharge rate of sh/min using a liquid thermosetting resin feeder. After that, the top is pressed with six pressure rollers to impregnate and defoam, and it is continuously molded. When about 3 m is molded, the supply of glass fiber and resin is stopped and mold A for single-layer molding is formed. was separated from cantilever beam body B. Flip the mold body A back and forth, so that the beam body B becomes the mold body A.
The mold was moved so as to fit inside the mold, and the mold was molded in the same manner as above, following the previous mold, to a length of 75 m.

A cylindrical molded product with a thickness of 9M was manufactured. Table 1 shows the physical properties of this molded product. In addition, each suppression roller has a diameter of 15 cWL,
The length is 60 degrees, the weight is 10 degrees, and the distance between each roller is 10 degrees.
It is α.

Example 2 Diameter 2.
The cylindrical mold A, which is 8 m long and 6 m long, is rotated at a rotation speed of 2.8 r, p, m (peripheral speed 24.6 m/min) and ols is rotated in the axial direction.
It was moved reciprocatingly at a constant speed of 7 m and was molded under the same supply conditions as in Example 1, with a thickness of 3 mm and a length of 7. At the time of molding, the glass fibers are not made into chopped strands, but are continuously supplied randomly in the form of long fibers, that is, in the form of rovings,
It was molded to a thickness of 3 mm. The glass fibers in the form of chopped strands were again supplied on top of the glass fibers, and the glass fibers were molded in the same manner as in Example 1 to obtain a cylindrical molded product with a length of 3 m and a thickness of 9 cm. It was done. The physical properties of this molded product are shown in Table 1.

Table-1

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a rotary molding apparatus used in the present invention, in which a molding material supply section is fixed to a cantilevered beam body and a cylindrical mold body can move back and forth. Figure-
2 is a partial view showing a fiber reinforcement supply device. Figure-3
FIG. 1 is a schematic diagram of a liquid thermosetting resin supply device. Moreover, FIG. 4 is a partial view showing the state of the molding material supply device and the suppression roller attached to the cantilever beam body. A・・・・・・Mold body for molding, B・・・・・・
・・・Cantilever beam body, C・・・・・・Moving material supply device and suppression roller mounting part q, D・・・・・・・・・・
・Press roller...--Guide rail, 2...--...
・・Motor, 6・−・・−・・・Transmission,
4・−・・・・・・・Chain, 5・・・・・・・・・
Motor, 6--...Transmission, 7--...
...Belt, 8...
Conduction roller, 9... Butterfly knob part,
1o・・・・・Moving wheels, 11・・・・・・・
...Fiber m reinforcement s, 12...Rubber roller, 13...Reinforcement locker, 14
・・・・・・・・・Motor, 15・・・・・・・・・
Belt, 16...Crack #Decoration port ° Supply port, 17...-Air cylinder, 18.
Curved/Liquid resin tank, 19... Catalyst tank, 20... Instep/Transfer pump, 21...
・・・・・・・・・Opening/closing valve, 22・・・・・・・・・
Line mixer, 26...--Resin liquid discharge device, 24 pieces/instep/air cylinder, 25...
...Arm, 26-...Crank crank, 2
7.-- Press roller bearing, 28.- Medium.
Suppression roller shaft diagram-2 +1 ・11. -No diagram-3

Claims (1)

[Claims] A cantilevered beam positioned in the inner space of a cylindrical mold that rotates with a centrifugal force less than twice the force of gravity and is capable of reciprocating in the axial direction, with a fiber reinforced material and a liquid thermosetting resin on the inner wall surface of the mold. The reinforcing material is supplied by a fiber reinforcing material supplying device fixed to the body, and then the reinforcing material and resin are pressed by at least one press roller fixed to the cantilever beam body and freely rotated to impregnate and defoam. A method for producing a molded article consisting of: