JPS60947A - Cylindrical shape made of resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides fiber-reinforced thermosetting resin (hereinafter referred to as FRP) upper layer and FRP.
This relates to a resin M cylindrical molded product in which a plastic foam layer is used as a core material between the RP lower layer and the upper and lower layers are connected by a lip.

Conventionally, cylindrical molded products of FRP sandwich structure with a plastic foam layer as a core material have been put to practical use in water tanks, silos, insulated pipes, heat-retaining containers, etc. for the purpose of improving heat-retaining performance and rigidity.

The molding method used is to first mold an FRP cylindrical product using various molding methods such as hand lay-up method, spray-up method, filament winding method, centrifugal molding method, and rotational molding method. After that, various plastic foams are attached or molded to the molded body, and further F
A cylindrical molded product with an FRP sandwich inch structure was obtained by forming the IIP layer.

The sandwich-structured cylindrical molded product thus obtained is FR
The P upper layer and the FRP upper layer are supported by the strength of the plastic foam itself or by the adhesive strength between the FRP upper and lower layers and the plastic foam. Generally used plastic foams have significantly lower strength than the FRP upper and lower layers, so when a large load is applied, the plastic foams break due to shear stress and buckling stress. Also, if a local load is applied, the material will break due to concentrated stress. Furthermore, if excessive stress is repeatedly applied, the plastic foam becomes powdery and does not retain its shape.

In order to overcome these drawbacks, a method has been adopted in which a high-strength core material is bonded between the upper and lower FRP layers using a high-strength adhesive. However, generally high-strength core materials, such as high density and thermal conductivity, make 4i! Disadvantages appear in FF and heat retention. In addition, high-strength core material is generally sold in the form of a fixed-length plate, and when forming a cylindrical object, it is necessary to bend and attach the high-strength core material to match the radius of curvature of the upper and lower FRP layers. There is. In this case, since the high-strength core material has high rigidity, the rebound phenomenon is large, making it difficult to adhere with perfectly matching curvatures. Therefore, when attaching a high-strength core material, it is necessary to cut the high-strength core material into strips and attach them. The strength in the direction does not necessarily improve.

The inventors of the present invention have arrived at the present invention as a result of intensive research into a lightweight structure that uses plastic foam and has high strength and excellent heat retention.

That is, the present invention provides a cylindrical molded article having a plastic foam layer between the fiber-reinforced thermosetting resin upper layer and the fiber-reinforced thermosetting resin lower layer. The present invention relates to a cylindrical molded product made of resin, characterized in that the two are connected by a lip.

In the present invention, especially low-density plastic foam is used to improve heat retention and weight reduction, and to compensate for the shortcomings of low-density plastic foam by connecting the FRP upper layer and FRPT layer with a lip. To provide a cylindrical molded article having a structure that can be installed in a position where a concentrated load is applied to prevent destruction due to the concentrated load.

The cylindrical molded product referred to in the present invention is one having a circular, elliptical, polygonal, or other shape in cross section, and is parallel or tapered tubular.

The resin cylindrical molded article of the present invention includes, for example, (a step of molding an AIFRP lower layer, (B) a step of molding a plastic foam, (C) a step of cutting a groove in the plastic foam, (
D) Manufactured by a combination of the steps of molding the 17-ply and molding the +l115 FRP upper layer. That is, depending on the form and purpose of the reply, for example (A), (B), tc)
, (D), fE), (A), (
D), (odor), molded in the order of (B), (A), f
D), (B), (E) molded in the order, (A),
(B), (C), (DJ, (B), (those molded in the order of gradient), (N, (B), (D), (B), (those molded in the order of scent) can be mentioned.

The molding method in the above steps (A) and E) may be various molding methods such as hand lay-up method, spray-up method, filament winding method, centrifugal molding method, rotational molding method, etc. The molding methods for the and odor steps may be different.

The molding method in step (B) is (A), (B), and (C).
, (DJ, (Smell order, (AJ.

(D), (B), (smell order and (At, (B), (C
), (D), (B), (When molded in the order of odor, a fixed length plate of various low-density plastic foams may be attached, or spray foam molding may be used. Also, (A) ,
(D), (odor), (B) When molded in the order of 10, it is molded by injection foam molding.Furthermore, (A), (B), (D
When molding is performed in the order of J, (Bl, and (E)), spray foam molding is suitable.

(The process of C'l is FR by a plastic foam cutting machine.
This is done by cutting the plastic foam molded on the PT layer into grooves in the circumferential direction, axial direction, spiral direction, or base grain direction as required. The cross-sectional shape of the groove can be selected from any shape such as a square, a U-shape, a 7-shape, or a semicircle.

The molding methods in step (D) are (A), (B), and (C).
, (D), (Among those molded in the order of odor, when molded on the inner surface of a cylindrical mold, it is molded by hand lay-up method, spray-up method, centrifugal molding method, rotational molding method, etc.
When molding is performed on the outer surface of a cylindrical mold, the molding is performed by a hand lay-up method, a spray-up method, a filament winding method, or the like. Also, j of (N, (D), (E), (B)
In the case of forming by IH, a plate having a quadratic curved surface such as a corrugated plate is preformed by bonding a flat plate to one side, and this is bonded to the FRPT layer. (
Al.

(D), (B), (For those molded in the order of smell, when molded on the inner surface of a cylindrical mold, it is molded by hand lay-up method, spray-up method, rotary molding method, etc. When molding is performed on the outside of the mold, it is molded by hand lay-up method, spray-up method, filament winding method, etc. (N, (B), (Q, (D), (B), (E)) (Shu, (B), (DJ, (B), (8) When molding on the inner surface of a cylindrical mold in the order of 8, hand lay-up method, spray-up method, rotational molding method, etc. When molding is performed on the outer surface of a cylindrical mold, it is molded by a hand lay-up method, a spray-up method, or the like.

The fiber-reinforced phase used in the upper and lower layers of fiber-reinforced thermosetting resin is glass fiber, carbon fiber, aramid fiber (manufactured by DuPont,
Known fiber reinforcing materials such as Kevlar fiber) can be mentioned, and glass fiber is particularly preferred. Such reinforcing fibers are used in the form of mats, rovings, chopped rovings cut into appropriate lengths, etc., and combinations thereof can also be used. The amount of reinforcing material used is usually 10 to 80 percent, preferably 15 to 6 percent, in the molded product.
A suitable amount is 0% by weight, more preferably 20 to 50% by weight.

The thermosetting resin used in the upper and lower fiber reinforced thermosetting resin layers includes known liquid thermosetting resins such as unsaturated polyester resin, epoxy resin, phenol resin, and vinyl ester resin. Saturated polyester resins are preferred. When using this unsaturated polyester resin, it is preferable to use a method of curing using a combination of a peroxide or the like as a catalyst and a metal salt, an amine, or the like as a curing accelerator. Incidentally, such unsaturated polyester resin may be cured by other curing means such as ultraviolet curing.

The plastic foam used in the present invention is preferably one with a low density, such as general resins such as urethane resin, acrylic resin, polyvinyl chloride resin, urea resin, phenol resin, polyethylene resin, polystyrene resin, and copolymers thereof. Known low density plastic foams may be mentioned. Also, plastic foam may be used with footboards,
It may also be formed by spray foaming or injection foaming. The density of such plastic foam is 0.01-0.2 g/
crn” is preferred, more preferably 0.01 to 0.1
E/crI? It is.

The ribs in the present invention may have any structure as long as they connect the FRP upper layer and the FRPT layer, and the ribs may be in any of the circumferential direction, axial direction, or a combination of these in the base grain direction or spiral direction. The rib may have a height of 5 to 100 zm, preferably i D to 80 m,
Thickness 0.5~501RI11゜preferably 0.5~30
It's my friend. In addition, the spacing between the ribs depends on the rib dimensions, rib direction,
It is selected as appropriate depending on the required strength, etc.

The material of the ribs is preferably FRP due to the molding process and structure, but FRP is preferable.
Any material may be used as long as it is capable of adhesion to the RP upper layer and the FRPT layer and has a strength of at least twice, preferably at least three times, that of the core material used, and is appropriately selected from commonly known Hamura materials. .

Further, the ribs may be formed before or after the plastic foam is stretched or after the plastic foam is stretched, or preformed pieces may be bonded together.

As shown in Table 1, the cylindrical molded product formed in this way has excellent heat retention and high strength physical properties, and is different from conventional cylindrical molded products using low-density plastic foam. In comparison, the amount of deformation due to cylindrical deflection is % to %, and the amount of deformation is 2% due to local compression.
~6 times stronger. In addition, it has the same or % of the heat retention ability, and compared to a cylindrical molded product using a high-strength core material with the same strength, it has three times the heat retention ability and weighs 1/1.8 becomes.

Therefore, the cylindrical molded product of the present invention has good strength, heat retention, rigidity,
Due to its excellent performance such as weight reduction, it can be used for thermal tanks, water tanks,
It can be widely used in silos, heat insulation pipes, scrubbers, pig pens, etc.

Next, the present invention will be described in detail with reference to Examples.

Example 1 A cylindrical molded article having a structure as shown in FIG. 1-b and having a lip in the circumferential direction and having a diameter of 2 m and a length of 6 m was obtained.

The cylindrical mold was rotated at a circumferential speed of 22.5 m/min, and an unsaturated polyester resin (Polylye FG-104, manufactured by Dainippon Ink Chemical Co., Ltd.) and 6% as an accelerator were applied to the inner wall surface of the mold using a liquid thermosetting resin supply device. Cobalt naphthenate (manufactured by Inu Nippon Ink Chemical Co., Ltd. → 0.4 parts by weight and 1.0 parts of 55% methyl ethyl ketone peroxide (NOF M) as a catalyst were mixed and fed at a rate of 10 to 9 minutes, followed by fiber reinforcement. Glass fiber (Glass roving S P-1,
Asahi 7 (manufactured by Iper) was cut into chopped strands with a length of 501 m and fed at a rate of 5 kg/min.

Furthermore, they were pressed with six freely rotating steel pressing rolls with uneven surfaces. This suppression roll has a diameter of 15c.
rrL, length 60crrL, weight 10cm, and the interval between the six rolls was 10crrL each. Spray foaming was performed on the FRP lower layer with a thickness of 6 mm thus obtained using a urethane resin spray foaming device Mini Probler (manufactured by Nippon Ransburg). The resin used is Hyprox RP-986C (Dainippon Ink Chemical) as a polyol component, and Hyprox 5p-290 (Dainippon Ink Chemical) as a polyisocyanate component.
It was used. Is the discharge pressure at this time 6kl? /cf was used. The foam layer obtained in this way was approximately 40 pieces thick, but because the surface was uneven, a foam cutting machine was used to reduce the thickness to 6 pieces.
Cut to 0 dragon. In addition, the density of the foam is 0.059/cr
After this, the foam was cut to a depth of 50 g using a foam cutting machine.
A groove was cut in the circumferential direction with a groove width of 500 mtrt in a rectangular cross-sectional shape with a width of 40 mrn and a width of 40 mrn.

In the resulting groove, a lip connecting the upper and lower FRP layers was formed using the above-mentioned unsaturated polyester resin mixture and glass fiber m (Chopmat CM-455, manufactured by Asahi Fiber) by hand lay-up method.

After that, the FRP layer is formed using the same molding method as the FRPT layer described above.
The upper layer was molded to a thickness of 6 mm.

The thus obtained cylindrical molded product has a diameter of 2 m and a length of 6 m, the thickness of the FRP lower layer is 6 mm, the thickness of the urethane foam layer is 30 ii, and the thickness of the FRp upper layer is 6 nm.
It has FRP ribs connecting the lower layer and the FRP upper layer with a height of 60 mm and a width of 40 mm at intervals of 500 mm in the circumferential direction.

Example 2 A cylindrical molded article having a structure example and having a lip in the circumferential direction and having a diameter of 2 m and a length of 3 m was obtained as shown in FIG. 1-a.

Using the same unsaturated polyester resin mixture and chopped mat as in Example-1, an FRP lower layer with a thickness of 6 mm was molded on the outer surface of the cylindrical mold by the hand lay-up method, and on top of this, the same method as in Example-1 was applied. A polyurethane foam layer with a thickness of 60 mm was obtained.

In addition, in the same manner, grooves were cut in a rectangular shape with a height of 30mm and a width of 10mm at intervals of 50mm in the circumferential direction, and the unsaturated polyester resin mixture and the glass roving 5P- used in Example-1 were cut. 3 was used to form a lip by the filament Weingeng method.

Furthermore, an FRP upper layer having a thickness of 6 layers was molded on top of this using the same molding method as the FRP lower layer. The thus obtained cylindrical molded product has a diameter of 2 m, a length of 3 m, and a thickness of the FRP lower layer of 3 m.
The thickness of the urethane foam layer is 30 mm, the thickness of the FRP upper layer is 6 mm, and the height of the connection between the FRP lower layer and the FRP upper layer is 6 mm.
There are 10 FRP ribs with a width of 10 mm at intervals of 500 in the circumferential direction.

Example 3 As shown in Figure 2-a, a cylindrical molded product having a corrugated plate-like lip of the structural example and having a diameter of 2 m and a length of 3 m was obtained.

An FRP lower layer with a thickness of 5vn was molded in the same manner as in Example-1, and a JIS-A-
A 5701 FRP corrugated plate with 130 waves (thickness 1 mm, valley depth 36 bars, pitch 130 mm) was cut into 600 mm in the length direction, and one side had FRP 1 mm thick, 600 mg wide, and about 2 m long. The pieces were pasted onto a flat plate, spliced together, preformed, and pasted in the circumferential direction in such a direction that the corrugated sheet side was installed on the FRP lower layer described above.

Example-10 FR with a thickness of 3 dragons was made in the same way as the FRP upper layer.
A P upper layer was molded.

Further, injection and foaming work was performed in the space of the corrugated plate lip using a urethane resin injection and foaming device MS-203 (Polyurethane Engineering Co., Ltd.).

The resin used is Hyprox RP- as a polyol component.
959 (manufactured by Dainippon Ink Chemicals), Hybrox 5P-299 (manufactured by Dainippon Ink Chemicals) was used as the polyisocyanate component, and Freon 12 was used as the blowing agent. In addition, the density of the obtained foam is o, o s
&/ctrl.

The thus obtained cylindrical molded product has a diameter of 2 m and a length of 3 m, the FRP lower layer has a thickness of 5 mm, the urethane foam layer has a thickness of about 30 y + m, the FRP upper layer has a thickness of 3 mm, and the thickness is 1 m. It has a corrugated plate-like lip.

Example 4 A cylindrical molded article having a structure as shown in FIG. 1-a and having a lip in the circumferential direction, a diameter of 2 TIL, and a length of 6 m, having an occluded circular cross section was obtained.

Using the same unsaturated polyester resin mixture and glass fiber as in Example 2, an FRP lower layer with a thickness of 3 mm was molded into a cylindrical mold with an occluded cross section by a hand lay-up method. A 60 mm thick PIOCELAN board (manufactured by Miki Kaseihin Kogyo) was pasted on top of this, and FRP IJ was applied in the same manner as in Example-2.
The FRP upper layer was molded.

The thus obtained truncated cylindrical molded product has a diameter of 2 m, an inner part of 1 TrL, and a length of 3 mm, and the thickness of the FRP lower layer is 6 m.
The basket is made of FRP with a thickness of 60 mm for the foam layer, 6 mm for the FRP upper layer, and 30 mm in height and 10 mm in width connecting the FRP lower layer and the FRP upper layer in the circumferential direction. 500 intervals.

Comparative Example-1 For comparison, cylindrical deflection was performed on FRP sandwich inch cylindrical molding Note) *- under the same conditions as Example-1 except that FRP ribs were not installed.Example-1, 2, 3 and Comparative Example The cylindrical molded product molded in -1 was cut into a length of 1 m in the axial direction, and a load of ioookg was applied as a compressive load to the top of the cylinder, and the amount of circumferential displacement was measured.

*-2: Lip strength comparative example-1 has no lip, so the strength of the core material is listed.

*-6: In examples 1, 2, and 5 of local compression of the lip part, the rib part of the cylindrical molded product was compressed by approximately 30X.
3[] crrL, and in Comparative Example-1, a plate cut out to approximately 3Q x 30 cm at an appropriate location was applied a local compressive load to a steel cylinder with a diameter of 10 mm, and the load at the time of failure was divided by the cross-sectional area of the steel cylinder. This is what I did.

*-4: Heat retention The cylindrical molded products molded in Examples 1, 2, and 5 and Comparative Example-1 were cut into 1 m length in the axial direction, and a flat end plate with the same structure as the body was attached to this. After joining the upper and lower surfaces to create a cylindrical tank, 1008C hot water was poured into the tank, and the time required for the water temperature to rise from 80°C to 6D°C was measured. The molded product was placed on a rigid platform at a height of 50 crrL above the floor, the hot water was stirred by an h horsepower electric motor, and the outside temperature at this time was 20°C ± 6°C.

[Brief explanation of the drawing]

1.2 and 4 are partial sectional views perpendicular to the axis of the resin cylindrical molded product of the present invention. Further, FIG. 6 is a partial cross-sectional view of a corrugated plate-like rib used in the resin cylindrical molded article of the present invention. 1... FRP lower layer 2... Plastic foam 3... Lip 4... FRP upper layer 5... Flat plate 6...・Colgate Board Agent Patent Attorney Katsutoshi Takahashi

Claims (1)

[Claims] In a cylindrical molded article having a plastic foam layer between the fiber-reinforced thermosetting resin upper layer and the fiber-reinforced thermosetting resin lower layer, the fiber-reinforced thermosetting resin upper layer and the fiber-reinforced thermosetting resin lower layer are connected by a lip. A resin cylindrical molded product characterized by: