JPH08142266A - Panel for reservoir - Google Patents

Abstract

PURPOSE: To obtain a panel for a reservoir which can be easily manufactured and has high strength by using continuous glass fiber-reinforced sheet molding compound formed of swirl-like random continuous long glass fiber and thermosetting resin composition. CONSTITUTION: The mat of continuous glass fiber-reinforced sheet mounting compound(SMC) formed of swirl-like random continuous long glass fiber and thermosetting resin composition is used as at least one layer of a panel for a reservoir in which the mat of the SMC using glass fiber bundle cut material having a length of 1 to 5cm is used. The one mat 15 is placed as the lowermost layer on a lower mold 10 having a protruding lower mold center 11 and a lower mold step 12 for forming a flange at the peripheral edge, suitable number of SMC mats 16 using the glass fiber bundle cut material of 1 to 5cm are superposed at the bottom, top and side plate, an upper mold having the recess upper mold center is superposed, pressurized, heated and molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage tank panel such as a water tank or an oil tank.

[0002]

2. Description of the Related Art Conventionally, for storage tank panels such as water tanks and oil tanks, a molding material composed of an unsaturated polyester resin, a filler, a thickener and the like is impregnated into a cut glass fiber bundle having a length of 1 to 5 cm. A plurality of SMC (sheet molding compound) mats are laminated and press-molded. In this case, since strength is insufficient only by stacking SMC mats using a cut glass fiber bundle having a length of 1 to 5 cm, glass cloth is used for both the uppermost layer and the lowermost layer of the laminate, or one of them. Reinforcing is common practice.

[0003]

As described above, the conventional SMC-only laminated body using a glass fiber bundle having a length of 1 to 5 cm has insufficient strength, and cracks are generated particularly in the bolted portion during panel assembly. There was a problem such as occurrence. When an SMC mat and a glass cloth for reinforcement are used, the glass cloth may be broken or twisted due to the flow of the SMC mat when several SMC mats are laminated and press-molded. It was Further, if the fluidity is too large, the glass fibers in the SMC are partially oriented, which causes directionality in the strength, and the strength varies depending on the location and direction, and the strength decreases as a whole. there were.

As described above, SMC alone using a cut glass fiber bundle having a length of 1 to 5 cm is insufficient in strength, and when a glass cloth is used for a thick FRP molded product, an SMC mat is used. There is a problem that it is difficult to press-form a plurality of laminated layers. The present invention has been made in view of such a conventional technique, and provides a storage tank panel that can be more easily manufactured and has high strength.

[0005]

In the present invention, the above problems are solved by using continuous glass fiber reinforced SMC comprising swirl random continuous glass long fibers and a thermosetting resin composition. This continuous glass fiber reinforced SM
C may be used alone or in combination with SMC made of a thermosetting resin composition in which cut pieces of a glass fiber bundle having a length of 1 to 5 cm are randomly oriented. That is, by using a continuous glass fiber reinforced SMC mat for at least one layer of a storage tank panel laminated with an SMC mat using a glass fiber bundle cut product having a length of 1 to 5 cm, a glass cloth is not used. Also provides a storage tank panel having sufficient strength and a method for manufacturing the same.

Continuous glass fiber reinforced SM used in the present invention
C (sheet molding compound) is a sheet-like material obtained by impregnating a continuous glass fiber in a swirl shape, that is, randomly oriented while drawing a loop with a liquid thermosetting resin. Glass roving is used as the continuous glass fiber of the reinforcing material, and particularly 1100 to 4800t.
ex, fiber diameter is 9 to 23 μ, and number of bundles is 50 to 4000
Book continuous glass fibers are preferred.

Continuous glass fiber reinforced SM used in the present invention
C is an unsaturated polyester resin as a thermosetting resin,
Known SMC such as vinyl ester resin and phenol resin
What is used for can be used. The low-shrinking agent, the filler, the curing agent and the like are the same and are not particularly limited.

[0008]

In the present invention, by using continuous glass fiber reinforced SMC comprising swirl random continuous glass long fibers and a thermosetting resin composition, a storage tank panel having sufficient strength without using glass cloth. Therefore, it is possible to reduce the number of steps and save extra cost.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. FIG. 1 shows a storage tank 1 that uses a panel 2 for an assembled storage tank.
2 is a partially cutaway sectional view of FIG. Assembled storage tank panel 2 has flanges 3 formed around its four sides.
A bottom wall 4, a side wall 5 and a ceiling wall 6 are formed by sequentially connecting the flanges 3. FIG. 2 is a partially cutaway perspective view of the assembly-type storage tank panel 2. The flange 3 is provided with a hole 7 into which a fastening bolt is assembled when the storage tank 1 is assembled. FIG. 3 is a partially enlarged sectional view in the vicinity of the flange 3. SMC layer (22% by weight of iso-neopen unsaturated polyester resin, 32% by weight of calcium carbonate having an average particle diameter of 2 μm, 31% by weight of roving glass fiber cut into 2.5 cm) 8 and continuous glass fiber reinforced SM
Layer C (22% by weight of iso-neopen unsaturated polyester resin, 32% by weight of calcium carbonate having an average particle diameter of 2 μm,
Roving glass fiber (31% by weight) 9 which is not cut. A method of manufacturing the assembly-type storage tank panel 2 according to the embodiment of the present invention will be described with reference to FIG. The lower mold 10 is
It is provided with a convex lower die central portion 11 and a lower die step portion 12 forming a flange 3 of the assembly panel 2 on the peripheral portion thereof. The upper mold 13 is provided with a concave upper mold central portion 14. Continuous glass fiber reinforced SMC mat 15 on the lower mold 10
One sheet (thickness: 1.5 mm) is placed as the lowermost layer, and the SMC mat 16 (thickness: 2 mm) is laid on it. Overlapping SM
The number of C mats is 6 for the bottom plate and 2 for the top plate.
The first side plate is three, the second side plate is four, the third side plate is five, and the fourth side plate is six. Further, the upper mold 13 is put thereon and heated under pressure. Pressure is 35Kg / c
The m ² and heating temperature are about 130 ° C to 150 ° C. The assembled storage tank panel 2 thus formed is used as a bottom plate, a side plate, and a top plate, respectively, to form a storage layer 1 (2 m × 2 m × 4).
m) was assembled. Further, a hydraulic strength test was conducted using the bottom plate. The water pressure strength test is a test method in which four sides of the storage tank panel 2 are sealed so as not to leak water, water pressure is applied to the surface portion, and the water pressure leading to breakage is measured.

As Comparative Example 1, only the SMC mat 16 is used for the bottom plate, 7 for the top plate, 3 for the top plate, 4 for the first side plate, and 5 for the second side plate. There are 6 side plates,
For the fourth side plate, another seven plates were used. Comparative Example 2
As a storage tank panel, an assembly type storage tank panel formed by molding one glass cloth (YEM2103, manufactured by Mie Woven Co., Ltd.) in the lowermost layer was assembled in the same manner as in Example,
Similarly, a hydraulic strength test was conducted. Table 1 shows the results.
In Comparative Example 1 including only the SMC mat, many cracks were generated around the holes when the bolts were tightened during panel assembly.
In the example of the present invention and the comparative example 2 using the glass cloth, no cracks occurred. Moreover, the hydraulic strength is about 10% higher than that of the comparative example. In this manner, by using the continuous glass fiber reinforced SMC mat, a storage tank panel having sufficient strength without cracks during assembly without a glass cloth was obtained.

[Table 1]

[0011]

As is apparent from the above description, by using the continuous glass fiber reinforced SMC mat, it was possible to obtain a sufficiently strong storage panel without using glass cloth together. As a result, the continuous glass fiber reinforced SMC mat alone or the continuous glass fiber reinforced SMC mat and the SMC mat alone can be molded, so that the number of steps can be omitted and the cost can be further reduced.

[0012]

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a storage tank.

FIG. 2 is a partially cutaway perspective view of a panel for a prefabricated storage tank.

FIG. 3 is a cross-sectional view in the vicinity of a flange of the assembly-type storage tank panel.

FIG. 4 is an explanatory view at the time of molding a panel for a prefabricated storage tank.

[Explanation of symbols]

 1: Storage tank 2: Storage tank panel 3: Flange 4: Storage tank bottom wall 5: Storage tank side wall 6: Storage tank ceiling wall 7: Holes for fastening bolts 8: SMC layer 9: Continuous glass fiber reinforced SMC layer 10: Bottom Mold 11: Lower mold center 12: Lower mold step 13: Upper mold 14: Upper mold central 15: Continuous glass fiber reinforced SMC mat 16: SMC mat

Claims (2)

[Claims] 1. A continuous glass fiber-reinforced SMC comprising swirl random continuous continuous glass fibers and a thermosetting resin composition.
A panel for a storage tank characterized by using. 2. A continuous glass fiber reinforced SMC comprising swirl random continuous continuous glass fibers and a thermosetting resin composition.
And a SMC comprising a thermosetting resin composition in which cut glass fiber bundles having a length of 1 to 5 cm are randomly oriented, and the storage tank panel according to claim 1.