JPS6140117A - Preparing fiber reinforced plastic ring - Google Patents

Abstract

PURPOSE:To secure a flat packing surface free from foam inside and on the surface, and excellent in electrically insulating properties, gas sealing properties and mechanical strength by supplying thermosetting resin composites into a pressure reduced mold. CONSTITUTION:The resin in the resin tank 2 is thermosetting resin composite and reduced in pressure and defoamed and injected from the resin inlet 17 into the pressure-reduced mold 3. The mold 3 is preheated by heat medium 6 introduced into the heater 5 and a vessel in atmospheric pressure, then, begins to be vacuumized by the vacuum piping 10 system. After vacuumization, the specified degree of vacuum or less must be confirmed to be kept. Then, the resin composites are mixed in the preheated resin tank 2 and the resin composites are defoamed in the resin piping 11 system. Thereafter, the resin composites are injected from the inlet 17. The laminated glass base 15 is impregnated with the resin composites. Hereby, it is possible to obtain a remarkably flat packing surface free from foam inside and on the surface and excellent not only in electrical insulating properties but gas sealing properties and mechanical strength.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing a fiber-reinforced plastic ring.

(Conventional technology) Conventionally, large-diameter fiber-reinforced plastic R (hereinafter referred to as

FRP rings) could be manufactured using methods such as the hand lay-up method in which air bubbles remain inside and on the surface, but their use was limited to general-purpose use, and they required advanced gas seals (airtight), liquid seals (oil-tight, etc.). ) and structures or parts that require electrical insulation. Under these circumstances, in recent years, there has been a demand for the development of large-diameter FRP rings with no air bubbles inside or on the surface, which can also be used as electrical insulating gaskets for large vacuum containers (about 4,000 mm in diameter) that require high vacuum, and as structural gas sealing materials. ing.

On the other hand, press molding is an alternative method for manufacturing large-diameter FRP wheels that alleviates the disadvantages of the hand lay-up method (resistance of air bubbles inside and on the surface). However, the press used for this method (press surface plate size 4000
Since the price of 300 mn square) is enormous, there is a huge problem in terms of cost.

(Objective of the Invention) The object of the present invention is to solve these problems and meet the above requirements without leaving any air bubbles inside or on the surface.

F-P can ensure not only electrical insulation but also excellent gas sealing (airtightness), mechanical strength, and a smooth packing surface! Niruru provides a manufacturing method suitable for manufacturing R.

(Structure of the Invention) The present invention supplies a laminated base material to an annular mold having an upper mold and a lower mold, and then brings the mold into a reduced pressure state to inject a thermosetting resin into the mold. supply things.

The present invention relates to a method for manufacturing 182 wheels which is then heated or heated and pressurized.

The laminated base material is inorganic fiber such as glass fiber.

Organic fibers such as polyester and aramid fibers are used.

As the thermosetting resin composition, an epoxy resin composition, an unsaturated polyester resin composition, etc. can be used, and there are no particular limitations.

The manufacturing method of the present invention has a large diameter (outer diameter of 1000 mm or more)
This product is suitable for manufacturing FRP wheels.

FIG. 1 shows an example of a manufacturing apparatus used in the manufacturing method of the present invention.

In Figure 1, 1 is a vacuum pump for creating a vacuum inside the resin tank 2 and mold 3. ! ! 3 is divided into upper and lower molds and tightened with tightening bolts and nuts 12 via an OIJ ring 13, and the inside of the mold is used as a vacuum vessel and a pressure vessel. Also, inside the mold.

A laminated base material 15 for the FRP wheel is sandwiched between the outbuilding boards 14 from above and below, and a spacer 16 for adjusting the thickness of the FRP wheel is installed.

The resin in the resin tank 2 is provided with a thermosetting resin composition,
After degassing under reduced pressure, the resin is injected through the resin injection port 17 into the mold 3 which has been brought into a reduced pressure state.

For heat retention and curing of ceramics and injected resin compositions.

A heater 5 or a heat medium 6 contained in a heat medium container 4 is used. A second mold is added to the mold into which the resin composition has been injected.
As shown in the figure, the pressure of a gas insoluble in the resin composition may be applied through the pressure port 21 to collapse the multi-cells that assist the impregnation of the resin composition into the laminated base material. Similarly, while this pressure is being applied, as shown in FIG.
Pressure cutter with 6KF1 safety pulp 20<-19t
- Set.

In Figures 1 and 2, 7 is a glass tube hopper, 8
9 is the resin tank vacuum gauge, and 9 is the mold vacuum gauge.

10 is mold vacuum piping, and 11 is resin tank vacuum piping.

18 is pulped.

(Example) Glass cloth (manufactured by Nitto Boseki, product name WE-35BX)
23 is cut into three fan-shaped rings with a finished outer diameter of 4,300 φ and an inner diameter of 3,700 wnφ as shown in FIG. Mold 3 in the figure (outer 4700 mmφ, inner diameter 33
00mφ, height 300mm) 128 sheets are stacked. Next, set the spacer 16 for thickness adjustment, and turn the upper mold into an O
Tighten with the tightening bolt/nut 12 via the ring 13. Next, the mold 3 is preheated to atmospheric pressure by the heater 5 and the heating medium (glycerin) 6 introduced into the container, and then evacuation is started by the mold vacuum piping lO system. After vacuuming, confirm that the vacuum level is below the specified level of 3 TOrr.

Next, an epoxy resin composition is blended in a resin tank 2 preheated to 75° C., and the epoxy resin composition is defoamed using a resin tank vacuum piping system 11 to remove air bubbles.

Thereafter, the above-mentioned epoxy resin composition is injected through the injection port 17 at the top of the mold to impregnate the laminated glass substrate 15. In addition, as an epoxy resin composition.

Epoxy resin (manufactured by UCC, product name ERL-4221) 1
00 parts by weight, curing agent (manufactured by Shin Nippon Rika, trade name: HHPA)
A mixture containing 100 parts by weight of C) and 0.5 parts by weight of a curing accelerator (manufactured by Nagashio Sangyo ■, trade name BDMA) was used.

゛ The completion of the injection is confirmed in the glass tube hopper 7. Thereafter, the mold and the resin tank vacuum piping system were removed, and as shown in FIG. 4ka/at? apply pressure. The injected epoxy resin composition was heated at 24°C at 75°C.
After curing for 1 hour, remove the mold from the mold and further cure for 13 hours.
After-curing was performed at 5°C for 24 hours to obtain a large-diameter FRP ring shown in Figure 4 a (top view) and b (@ side view).
(The unit of number is Kakuderuru).

Table 1 shows the characteristics of the large-diameter F-ring P ring obtained by the above method compared to the FRP board obtained by the hand lay-up method.

The rough FRP surface was machined and finally polished. PRPR has a surface roughness symbol of 0.8S to 6.
38 As for the packing (seal) surface.

Although we were able to secure sufficient flatness, the non-dray amplifier F
Since the RP plate has microbubbles inside and on the surface, it leaves recesses and a good polished surface cannot be obtained.

The amount of leakage refers to the amount of leakage (intrusion of air into the vacuum container) when an O-ring is applied to the packing surface and used as a sealing material for a vacuum container.

As shown in Table 1, the large-diameter FlaP ring obtained by the manufacturing method of the present invention has superior gas sealing properties and mechanical properties compared to /'% dry-up FB and P plates.

(Effects of the invention) Compared to the conventional hand lay-up method, the present invention leaves no air bubbles inside or on the surface, has excellent electrical insulation, and has excellent gas sealing (airtightness). It is possible to obtain an FRP wheel that is strong and has an ultra-smooth packing surface.

In addition, according to the present invention, compared to the manufacturing equipment (press etc.) using the above-mentioned press forming method, it is approximately 1/20 to 1/20
It can be produced at a cost of /30 and can be expected to have great effects.

[Brief explanation of drawings]

1 and 2 are views showing an example of the manufacturing apparatus used in the manufacturing method of the present invention, FIG. 3 is a cutaway view (plan view) of the glass cloth used in the example, and FIGS. 4a and 4b are 1A and 1B are a plan view and a side view, respectively, showing an FRP ring manufactured according to an embodiment of the present invention. Explanation of symbols 1...Vacuum pump 2...Resin tank 3...
・Mold 4... Heat medium container 5... Heater 6... Heat medium 7... Glass tube hopper 8... Resin tank vacuum gauge 9... Mold vacuum gauge 10... Mold Vacuum piping 11
...Resin tank vacuum piping 12...Tightening bolt/nut 13...0 ring 14...Release plate 15.
...Laminated base material 16...Spacer 17...
Resin injection port 18...Valve 19...Pressure chamber/bar 20...Safety pulp 21...Pressure port
22...Mekura camp 23...Glass cloth 24...Glass cloth butt part 25...Vacuum gauge set opening $ 1 Figure 1 Figure i4

Claims (1)

[Claims] 1. A laminated base material is supplied to an annular mold having an upper mold and a lower mold, the mold is then brought into a reduced pressure state, a thermosetting resin composition is supplied into the mold, and then heated. Or a method for producing a fiber-reinforced plastic ring characterized by heating and pressurizing.