KR100301360B1 - Process for preparing filament winding product - Google Patents

Abstract

The present invention is to manufacture a filament winding molded article that can manufacture voidless FRP products that can be applied to high voltage devices, which are economical and excellent in mechanical strength as well as excellent in corrosion resistance and electrical properties, even in long molded articles. To provide a way.

In the resin impregnation step, the glass roving 3 is passed on the surface of the drum 2 repeatedly in a plurality of times under atmospheric pressure to impregnate the resin liquid 7 in the glass roving 3. Thus, the impregnation state of the glass roving 3 is made good by performing the resin impregnation process, and the resin liquid 7 and air are fully substituted, and the void level is raised to obtain the FW molded article 6 excellent in corrosion resistance and electrical characteristics. Can be.

Description

Process for preparing filament winding product

The present invention relates to a filament winding method for producing a tubular fiber-reinforced plastic by winding a reinforcing fiber material continuously on a rotating mandrel in a method for producing a fiber-reinforced plastic, and in particular, a reinforcing fiber material on a rotating drum. It is an improvement of the drum method to impregnate the resin.

Conventionally, fiber reinforced plastic so-called FRP is widely used in various fields as a material having excellent mechanical strength and insulation property. As a method for producing FRP, a filament winding (hereinafter abbreviated as FW) method, a drawing molding method, a vacuum impregnation method and the like are known.

Among them, the FW method is a manufacturing method for forming long articles at atmospheric pressure, and reinforcing fibers at a predetermined winding angle while impregnating the resin in the reinforcing fibers by performing replacement of air contained in the surface of the reinforcing fibers with a thermosetting resin. This is a relatively simple way of winding the ash onto the mandrel continuously.

The FW method is roughly divided into a dipping method and a drum method according to the difference of the resin impregnation method. The dipping method is a method of impregnating a resin in a reinforcing fiber material in an impregnation tank filled with a resin liquid, and the drum method is a method of impregnating a resin in a reinforcing fiber material on a rotating drum. Among these two methods, the dipping method has to be arranged in a straight line, so that the impregnation tank has to be large. On the other hand, the drum method allows the impregnation tank to be compact since the reinforcing fiber material is passed while contacting the curved surface portion of the drum surface.

In the FW method, in any of the above-described methods, after impregnating the resin, the reinforcing fiber material is wound on the mandel to manufacture a wound product, the wound product is cured, and the core is removed. FW molded parts manufactured in this order are widely used as structures requiring mechanical strength, such as water pipes, storage tanks, and spacecraft.

In addition, the vacuum impregnation method is a method of manufacturing a voidless FRP by impregnating a resin in a vacuum atmosphere. In the vacuum impregnation method, first, a glass cloth (specifically, about 1 m in width) is wound on a mold, and the entire mold is set in a vacuum tank. The pressure in the vacuum tank is reduced to 1 Torr or less with a vacuum pump. Under this condition, the resin is dropped onto the glass cross in a vacuum atmosphere, and the glass cross is impregnated with the resin. After impregnating the resin in this way, the entire mold is moved to a pressure tank (autoclave), pressurized and cured at a pressure of 30 kg / cm 2 · G, and mold release can be performed to produce a voidless FRP. Since the voidless FRP has not only mechanical strength but also excellent corrosion resistance and electrical characteristics, high voltage equipment is suitable for the purpose of the voidless FRP.

However, the FW method and the vacuum impregnation method have the following problems. That is, in the FW method, the resin impregnation step is carried out at atmospheric pressure, so that air in the atmosphere is mixed with the reinforcing fiber material or the resin when impregnating the resin, so that the air cannot be sufficiently replaced with the resin. Therefore, many fine voids are included in the manufactured FW molded article. As a result, the FW molded article is poor in corrosion resistance and electrical characteristics, and thus is not suitable for electrical applications applied to high voltage equipment.

On the other hand, in the vacuum impregnation method, the resin impregnation process is carried out in a vacuum tank and a hardening process in a pressurized tank, so that the manufacturing cost is high and the molded article becomes very expensive. In particular, when the long product is molded by the vacuum impregnation method, it is economically disadvantageous because the vacuum tank and the pressurized tank increase in size with the size of the molded product.

The present invention has been proposed to solve the above problems, and its object is to provide a filament that can produce a voidless FRP product that can be applied to a high voltage device excellent in corrosion resistance and electrical properties as well as economical and mechanical strength even in a long molded article. It is to provide a method for producing a winding molded article.

1 is a configuration diagram of a first embodiment of the present invention.

Fig. 2 (a) is a front view of the FW molded article according to the first embodiment, and Fig. 2 (b) is an ipsilateral side view.

Fig. 3 is a graph of the electrical characteristics (intrinsic pulse test) of the FW molded article according to the first embodiment and the FRP manufactured by the vacuum impregnation method and the conventional FW molded article.

4 is a configuration diagram of a second embodiment;

Code Description

1. Impregnation tank

2. Drum

3. Grass Roving

4. Mandrel

5. Winding article

6. FW molded parts

7. Resin Liquid

8. Scrub

9. Receiving Container

In order to achieve the above object, the invention of claim 1 is a rotatable drum disposed so that the impregnating tank filled with the resin liquid and the resin liquid in the impregnation tank at least contact the surface, and a rotatable mandrel disposed adjacent to the drum. And impregnating the reinforcing fiber material on the drum surface by passing the reinforcing fiber material on the surface of the drum without immersing the resin liquid in the impregnation tank and rotating the drum. Then, a curing step of winding the resin-impregnated reinforcing fiber material continuously to the rotating mandrel to produce a wound product, and further curing the wound product to remove the core of the mandrel. A method for producing a filament-winding molded article, which is an insulator made of fiber-reinforced plastic, by performing a removing step, wherein By saliva in the process, passing the reinforcing fiber material by repeating a plurality of times on the surface of the drum from atmospheric pressure characterized in that for impregnating the resin into the reinforcing fiber material.

In the invention of claim 1 as described above, since the reinforcing fiber material is impregnated with resin on the drum surface a plurality of times, the impregnated state of the reinforcing fiber material is good, and air in the air does not mix with the reinforcing fiber material or resin, Can be sufficiently substituted. Therefore, it is possible to suppress the generation of fine voids, excellent corrosion resistance, electrical characteristics and mechanical strength, even economically can be produced voidless FW molded articles.

In addition, the invention of claim 1 includes an impregnating tank filled with a resin liquid, a rotatable drum disposed so that the resin liquid in the impregnation tank contacts at least a surface thereof, and a rotatable mandrel disposed adjacent to the drum. An impregnation step is performed in which the resin is impregnated into the reinforcing fiber material on the surface of the drum by passing on the surface of the drum without being immersed in the resin liquid in the impregnation tank and rotating the drum. It is made of fiber-reinforced plastics by carrying out a winding step of continuously winding the mandrel rotating the fiber material to produce a wound product, and curing and removing the core of the mandrel after curing the wound product. In the method for producing a filament-winding molded article which is an insulator of the above, in the impregnation step, the table of the drum On to the said resin, it characterized in that the not enter the resin mixture in the impregnating bath of bubbles generated when impregnated into the reinforcing fiber material.

In addition, in the invention of claim 1 described above, bubbles are generated when the resin is impregnated into the reinforcing fiber material on the drum surface. However, since the bubbles do not enter the resin liquid in the impregnation tank, the reinforcing fiber material is the bubble in the resin liquid. The frequency of inclusion of bubbles in contact with is reduced, so that air and resin can be sufficiently substituted. Therefore, it is possible to economically manufacture a voidless FW molded article excellent in corrosion resistance, electrical characteristics, and mechanical strength by suppressing generation of minute voids.

According to a third aspect of the present invention, in the method for producing a filament-winding molded article according to claim 1, the air bubbles are removed from the impregnation tank.

According to the invention of claim 3, even if the resin liquid in the impregnation tank contains a large amount of bubbles, the bubbles are removed out of the impregnation tank so that the reinforcing fiber material does not come into contact with the bubbles in the resin liquid, thereby ensuring the substitution of air and resin. I can do it.

According to a fourth aspect of the present invention, in the method for producing a filament-wound molded article according to claim 1 or 3, the drum is rotated by passing the reinforcing fiber material while touching the drum surface.

In the invention of claim 4, since the reinforcing fiber material rotates the drum using a force contacting the drum surface, the driving source for rotating the drum is not necessary, so that the configuration can be simplified.

According to a fifth aspect of the invention, in the method for producing a filament-wound molded article according to claim 1 or 3, the drum itself is rotated.

In the invention of claim 5, since the drum itself rotates, the reinforcing fiber material can be smoothly passed on the surface of the drum.

According to a sixth aspect of the present invention, in the method for producing a filament-winding molded article according to claim 1, a plurality of impregnation tanks are provided.

In the invention of claim 6, the reinforcing fiber material can be impregnated with resin more reliably by providing a plurality of impregnation tanks.

Example

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail, taking a 1st and 2nd embodiment as an example. The first embodiment corresponds to the invention of claims 1 and 4, which will be described with reference to the configuration diagram of FIG. 2A is a front view of the FW molded article according to the first embodiment, FIG. 2B is an isometric view, and FIG. 3 is an electrical characteristic of the FW molded article according to the first embodiment and the FRP formed by the vacuum impregnation method and the conventional FW molded article. (Inner pulse test) It is a graph. In addition, although 2nd Embodiment respond | corresponds to description of Claims 1 and 3, it demonstrates with reference to the block diagram of FIG.

In all the embodiments, E glass roving (RS110RR-520, manufactured by Nitto Boseki) was used as the reinforcing fiber material, and the number of the pulled out and aligned pieces was set to 10 pieces. As the reinforcing fiber material, not only E glass roving but also glass fiber, carbon fiber, aramid fiber, alumina fiber and the like can be used. As the resin liquid, an epoxy resin EP827, an acid anhydride type curing agent HHPA as the curing agent, and an amine accelerator K61B as the accelerator were used, and the resin temperature was set to 50 to 60 ° C.

(1) First embodiment

As shown in Fig. 1, in the first embodiment, a plurality of impregnation tanks filled with the resin liquid 7 are disposed, and in each impregnation tank 1, a drum 2 for rotating the liquid surface of the resin liquid 7 is shown. ) Is installed. In this 1st Embodiment, the FW molded article which was FRP insulation cylinder was manufactured as follows.

① Resin impregnation process

First, the glass roving 3 was taken out while making contact with the surface of the drum 2 at a yarn speed of 0.1 to 30 m / min, preferably a 0.5 to 20 m / min. The drum 2 is rotated by the force generated on the contact surface between the glass roving 3 and the drum 2, and the surface of the drum 2 to which the resin liquid 7 is attached is brought into contact with the glass roving 3 The roving 3 was impregnated with the resin liquid 7. At that time, the amount of the resin liquid 7 adhered to the drum 2 surface was appropriately adjusted in accordance with the number of times of the glass roving 3.

The first embodiment is characterized in that the glass roving 3 is impregnated with the resin liquid 7 by passing the glass roving 3 on the surface of the drum 2 repeatedly a plurality of times. In such a resin impregnation process, a vacuum process was not performed at all and it was implemented in atmospheric pressure.

② Winding process

Winding article 5 having an outer diameter of 250 × inner diameter of 230 × length of 1000 mm by winding the glass roving 3 in which the resin liquid 7 is sufficiently impregnated by passing through the plurality of drums 2 and rotating in the mandrel 4. Prepared.

③ Hardening and core removal process

Even when hardening the resin liquid 7, it hardened 100 degreeC / 2 hours and 130 degreeC / 3 hours in atmospheric pressure, without pressurizing. Thereafter, the core of the mandrel 4 was removed to manufacture the FW molded article 6 shown in Figs. 2 (a) and 2 (b).

In the first embodiment as described above, the glass roving 3 is impregnated with the resin liquid 7 on the drum 2 repeatedly, and the impregnated state of the glass roving 3 is good. The air | atmosphere in air | atmosphere was not mixed in the resin liquid 7. Therefore, since air can be substituted with the resin liquid 7 sufficiently, generation | occurrence | production of a fine void was suppressed.

Specifically, the void content of the FW molded article 6 (based on JIS-K-7053) is 1 wt% or less, and the void level of the conventional FW molded article is 4.5 to 5.0 wt%. I could secure it. As a result, as shown in Fig. 3, the electrical characteristics (inner pulse test) equivalent to those of the FRP produced by the vacuum impregnation method were obtained.

According to the first embodiment, by adopting the FW method, even long molded articles can be manufactured economically, and an excellent void level can be ensured, and thus corrosion resistance, electrical characteristics and mechanical strength are improved, and mechanical strength is required. It is possible to manufacture FW molded articles which can be suitably used for high voltage equipment as well as structures. In the first embodiment, the glass roving 3 rotates the drum 2 by using a force that contacts the surface of the drum 2. Therefore, since a drive source for rotating the drum 2 is not necessary, the configuration can be simplified.

(2) Second Embodiment

As shown in Fig. 4, in the second embodiment, a scrubber 8 and a receiving container 9 are disposed in the impregnation tank 1, and in the resin impregnation step, bubbles are contained from the impregnation tank 1. It is characterized by removing the resin liquid 7 with the scrubber 8 and discharging it out of the impregnation tank 1 from the container 9 to which it is received. The winding process and the hardening / core removal process are the same as that of the said 1st Embodiment.

In this second embodiment, when the resin liquid 7 in the impregnation tank 1 contains a large amount of bubbles after the completion of impregnation, the scrubber 8 and the receiving container 9 impregnate the bubbles ( It can be removed out of tank from 1). Therefore, it is possible to prevent the glass roving 3 from contacting the bubbles in the resin liquid 7 and containing them. Therefore, as in the first embodiment, the generation of fine voids can be suppressed to produce a low-cost voidless FW molded article 6 excellent in corrosion resistance, electrical characteristics, and mechanical strength, and the FW molded article 6 can be manufactured in a high voltage device. Applicable to

(3) another embodiment

The present invention is not limited to the above embodiments, and polyester resins, vinyl ester resins, phenol resins, melamine resins and the like can be used as the thermosetting resin, in addition to epoxy resins. The curing agent or curing accelerator may be arbitrarily selected according to the type of thermosetting resin to be used, and other components such as a defoaming agent, a lubricant, a silane coupling agent, etc. may be added and blended within the range not required for the purpose of the present invention or as necessary. Can be.

In addition, according to the required void level, electrical characteristics, mechanical characteristics, the fiber diameter, the number of draws, the number of reinforcement fibers can be arbitrarily selected. In addition, the shape of the mandrel can be changed to obtain FW molded articles of various shapes such as cylindrical, conical, polygonal, elliptic, and the like. The embodiment of the invention according to claim 4 is characterized in that the drum itself rotates. It also includes a manufacturing method. According to this embodiment, a reinforcing fiber material can be passed smoothly.

In addition, in the said embodiment, although having shown and demonstrated having provided two impregnation tanks, three or more impregnation tanks may be provided. According to this embodiment, since the number of resin impregnations of the reinforcing fiber material can be increased, the resin can be impregnated with the reinforcing fiber material more reliably.

As can be clearly seen from the above description, according to the manufacturing method of the filament-winding molded article of the present invention, the reinforcing fiber material is impregnated with a resin repeatedly at a plurality of times under atmospheric pressure, so that even a long molded article is economical and not only in mechanical strength but also in corrosion resistance. And a voidless FRP product which can be applied to a high voltage device having excellent electrical characteristics.

Claims (5)

An impregnating tank filled with a resin liquid, a rotatable drum disposed so that the resin liquid in the impregnation tank contacts at least a surface thereof, and a rotatable mandrel disposed adjacent to the drum, wherein the resin in the impregnation tank The impregnation step of impregnating the resin with the reinforcing fiber material on the drum surface by passing the drum on the surface of the drum without being immersed in the liquid, followed by rotating the reinforcing fiber material impregnated with the resin. Winding process of winding up the mandrel continuously to manufacture a wound product, and after hardening the wound product again, hardening and core removal process of removing the core of the mandrel is performed, and the filament-winding which is an insulator made of fiber-reinforced plastic In the method of manufacturing a molded article, In the impregnation step, the reinforcing fiber material is impregnated with the resin on the surface of the drum by passing the reinforcing fiber material on the surface of the drum repeatedly in a plurality of times under atmospheric pressure, and the resin is impregnated with the reinforcing fiber material on the surface of the drum. A method for producing a filament-wound molded article, wherein bubbles generated during the injection are prevented from entering the resin liquid in the impregnation tank. The method of claim 1, A method for producing a filament-wound molded article, wherein the bubble is removed from the impregnation bath. The method according to claim 1 or 3, The drum is rotated by passing the reinforcing fiber material in contact with the drum surface, wherein the drum is manufactured. The method according to claim 1 or 3, A method for producing a filament-wound molded article, wherein the drum itself is rotated. The method of claim 1, A method for producing a filament-winding molded article, characterized in that a plurality of impregnation tanks are provided.