JPS5849851A - Hot water storage tank - Google Patents

Abstract

PURPOSE:To facilitate the forming of a layer and as well as enhance the hot water resistance of the layer by a method wherein a reinforced plastic layer is laminated on an unimpregnated side of a partly impregnated polypropylene sheet into fabrics. CONSTITUTION:Flexible fabrics 4 made of reinforcement fibers are forced halfway into the polypropylene sheet 1a by heat-pressing so as to partially impregnate. Further, the polypropylene sheet 1a is worked in the form of the inside liquid-contacting layer 1 of the hot water storage tank with said fabrics facing outside. After that, the portion of the fabrics not impregnated with polypropylene is impregnated with thermosetting resin and laminated with a reinforced plastic layer 1b consisting of thermosetting resin and reinforcement fibers in order to form the inside liquid-contacting layer 1.

Description

Detailed Description of the Invention The present invention provides a hot water storage tank with a three-layer structure consisting of an inner liquid layer, an intermediate heat insulating layer, and an outer skin layer, in which the inner wetted layer is impregnated with a stretchable fabric made of one reinforcing fiber. It is made by laminating a reinforced plastic made of a thermosetting resin and reinforcing fibers on the unimpregnated woven fabric side of a polypropylene sheet, at least a part of which is not impregnated, and the polypropylene side is in contact with the wjL.
The present invention relates to a hot water storage tank characterized by having a flat surface.

A hot water tank is generally used to store hot water that has been heated by a solar collector, or to store hot water that has been heated using surplus power at night. be. Therefore, in addition to strength and rigidity, hot water resistance (hereinafter referred to simply as hot water resistance) is important when used for long periods of time (poor hot water resistance may cause cracks on the wetted surface, causing water leakage and corrosion). It must be composed of three layers: a certain inner liquid layer, a central insulation layer with good heat retention, and an outer skin layer with excellent weather resistance, corrosion resistance, and a good appearance.

Conventionally, the three-layered hot water storage tank used as a hot water storage tank has an inner liquid layer made of unsaturated polyester and glass fiber, and due to its hot water resistance, corrosion resistance, and durability, the usable temperature is 80°C or lower. Met. When the temperature exceeds that temperature, the wetted inner tank has been manufactured using enameled steel plate or stainless steel plate, but these have the drawbacks of corrosion due to defects such as pinholes after many years of use, and are expensive. There is nothing to be gained. In order to solve this problem, the present inventors have conducted various studies and have impregnated a polypropylene sheet with a reinforcing fiber fabric having elasticity, and at least a portion of the reinforcing fiber fabric is impregnated onto the unimpregnated surface of the polypropylene sheet. Then, a reinforced plastic made of a thermosetting resin and reinforced fibers (hereinafter simply referred to as reinforced plastic) is laminated and cured. Therefore, the polypropylene layer and the reinforced plastic layer are formed using the reinforced fiber fabric as an intermediary. Obtaining a composite material with extremely strong mechanical bonding,
The inventors have discovered that it is extremely effective to use the polypropylene surface of the composite material as the liquid contact surface for the inner liquid layer of a hot water storage tank, and have completed the present invention.

Since the reinforced fiber fabric impregnated with the polypropylene sheet of the present invention has elasticity, it can be easily drawn and shaped into a relatively arbitrary shape by bending or vacuum forming. Because of the integration, the drawn polypropylene sheet does not deform after forming, and polypropylene has very good hot water resistance, making it highly suitable as a liquid layer on the inner surface of a hot water storage tank.

Next, as an example of the present invention, a cylindrical hot water storage tank will be explained in detail with reference to the drawings. FIG. 1 is a partially cutaway perspective view of a cylindrical hot water storage tank, FIG. 2 is an enlarged partial sectional view of FIG. 1, and FIG. 3 is a sectional view of the cylindrical hot water storage tank.

The hot water storage tank of the present invention is composed of an inner surface liquid layer 1, an intermediate heat insulating layer 2, and an outer skin layer 303, with an inner polypropylene sheet layer 1a for hot water resistance, a reinforced plastic layer 1b for strength and rigidity, and an intermediate heat retention property. The heat insulating layer 2 and the outer skin layer 3 share the roles of appearance and weather resistance, forming a hot water storage tank.

Reference numeral 11 in FIG. 2 is a polypropylene sheet layer, which is impregnated with reinforcing fibers 4 having elasticity. The sheet itself preferably has a grain size of α5 to 5.0, and may contain various commonly used additives and fillers. Methods for impregnating the stretchable reinforcing fiber fabric include, for example, a continuous press-fitting method using a heated rail, a hot press-fitting method using a heated hydraulic press, and the like. The heating temperature in this case is 5 to 20 degrees higher than the melting point of polypropylene (MCI method).
The temperature is preferably as low as 140 to 155°C. Although this polypropylene sheet can withstand 1 m of hot water, its strength and rigidity are low, so the lack of strength and rigidity is compensated for by backing it with a reinforced plastic layer using an impregnated reinforcing fiber fabric as a mediator. That is, by impregnating a polypropylene sheet with at least a portion of the reinforced fiber fabric having elasticity, laminating the reinforced plastic on the surface of the non-impregnated fabric and curing it, the polypropylene sheet was not impregnated. The fabric is impregnated into the reinforced plastic layer to form an extremely strong and integrated internal liquid layer. The reinforcing fiber fabric used here includes reinforcing fibers such as glass fibers, carbon fibers, vinylon fibers, Tetpn fibers, voripsibylene fibers, and Keppra fibers, among which glass fibers are the most suitable. These reinforcing fibers are woven into a harp-like tricot knitting or stockinette knitting, making it a stretchable fabric. Examples of the thermosetting resin forming the reinforced plastic layer include unsaturated polyester resin, epoxy resin, and phenol resin, and examples of the reinforcing fiber include glass fiber.゛Conventionally, there are sheets on the market that are made by mixing glass chop with resin and extruding it, but when bending or drawing by vacuum forming, the glass fibers in the resin peel off at the interface with the resin. This results in a decrease in strength and hot water resistance.
It had the disadvantage that the internal solution seeped out during long-term use. On the other hand, since the polypropylene of the present invention is impregnated with a stretchable reinforcing fiber fabric, it easily follows deformation during bending and vacuum forming, and the interfacial peeling between the polypropylene sheet and the fabric is prevented. Does not occur. Furthermore, the reinforced plastic is layered on the surface of the unimpregnated fabric and cured, so the polypropylene and reinforced plastic are strongly integrated using the fabric as an intermediary.
An inner rkJ wetted layer with hot water resistance, strength, rigidity, and properties can be obtained.

In addition, the intermediate insulation layer is made of urethane resin, polyester resin,
Foams such as phenol resin or glass wool are usually used for the outer skin layer, and steel plates, thermoplastic plastics, reinforced plastics, etc. are used for the outer skin layer.

Here, a cylindrical hot water storage tank is shown as an example, but in the case of a square hot water storage tank or a panel assembly hot water storage tank, a hot water storage tank having a three-layer structure shown in Figure 2, which is similar to the cross section of a cylindrical hot water tank, is made. Example 1 In manufacturing the cylindrical hot water storage tank shown in Fig. 3, first, a 200#/m'' tricot knitted fabric of polypropylene sheet and glass yarn with a thickness of 511 mm was placed on a flat plate mold of a heated hydraulic press with a thickness of 11 cm. and the temperature is 145-150℃.
The woven fabric was pressed into the polypropylene sheet by about a hand under hot press-fitting conditions of 20 Y/l of pressure and 60 seconds of pressurization time to obtain a polypropylene sheet impregnated with a stretchable reinforcing fiber fabric. Next, this polypropylene sheet was bent into a cylindrical shape with the woven side facing outward, the sheet ends were wrapped, and the outside and inside ends were welded using a polypropylene welding rod made of the same material as the sheet. In addition, a bottom plate and an upper mirror plate were respectively created by shaping using vacuum forming. Next, 6.
6. By welding and joining as shown in T, a storage tank was manufactured using the polypropylene layer of the inner surface liquid layer 1. Sosis 7
After applying a mixed resin containing 15 parts of cobal thenate to the surface of the unimpregnated fabric and thoroughly impregnating it,
Chopped strand mats of 45 ON/♂ were laminated using a mixed resin of the same composition and cured to form a reinforced plastic layer strongly integrated with the polypropylene layer, and a storage tank with an inner liquid layer IVC was obtained. Next K, 8M in advance
The side wall, bottom plate, and upper mirror plate of the outer skin layer 3 were formed by press molding using C molding material DICMAT-2454 (manufactured by Dainippon Ink and Chemicals Co., Ltd.). In this case, in order to keep the thickness of the intermediate heat insulating layer uniform, a spacer block 8 made of urethane block with a thickness of 70 m was installed. Next, two holes with a diameter of 12 m were drilled in a part of the upper end plate, and one hole was Intermediate heat insulating layer 2 was formed by injecting a urethane resin. Finally, a manhole 9, which was separately formed in the same manner, was set to complete the cylindrical hot water storage tank.

Example 2 A polypropylene sheet with a width of 155 mm (MHI, 15 m thick) was continuously extruded from an extruder with 250 glass yarns.
When knitted glass cloth knitted with II/♂ is put together and passed through a hot pressure hole heated to about 150℃, from k,
Cut the glass cloth into X13QQmifi and make it 10001
@X1 [Vacuum formed into a box shape of 10 rows x 150M. In this case, the surface into which the glass cloth was pushed should be the inside of the box, and then set it in the mold.

Charge 3 pieces of glass fiber (45ON/-; Ntenyas filament mat) and apply flk polylite P to the surface.
5 parts of calcium carbonate per 100 parts of a-261 (unsaturated polyester resin manufactured by Dainippon Ink and Chemicals Co., Ltd.)
0 parts, 1 part of methyl ethyl ketone peroxide as catalyst
After pouring a resin compound containing 0.1 part of α6% cobalt naphthenate as an accelerator, a urethane foam of 992MX992MX70mWI was placed on top of the resin compound, and then a glass fiber (450I/3cm of continua foam) was placed on top of it. When two sheets of filament mat (filament mat) are charged, the resin compaland is poured onto the surface, and the mold temperature is 80°C, the molding pressure is 101qF/m, and the pressurization time is 10 minutes. A unit panel board for square non-sticks with a three-layer structure was obtained. These panel plates were joined with bolts and nuts via packing to obtain a panel type square hot water storage tank.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway perspective view of a cylindrical hot water storage tank, and Figure 2 is a partially cutaway perspective view of a cylindrical hot water storage tank.
FIG. 3 is an enlarged partial cross-sectional view of the figure, and FIG. 3 is a cross-sectional view of a cylindrical hot water storage tank. 1...Inner surface liquid layer (1m...Polypropylene sheet layer, 1b...Reinforced plastic layer), 2...Curved intermediate insulation layer, 3... Outer skin layer, 4.
...Stretchable reinforced fiber fabric, 5.6.7.
・”-Contact 4rllll, s...Suh?-7' Lock, 9...Manhole.

Claims (1)

[Claims] In a hot water storage tank with a three-layer structure consisting of an inner liquid layer, an intermediate heat insulating layer, and an outer skin layer, the inner liquid layer impregnates a stretchable fabric made of reinforcing fibers, and at least a part of the inner liquid layer is not impregnated. A hot water storage tank comprising a laminated reinforced plastic made of an ILhK thermosetting resin and reinforcing fibers having an unimpregnated fabric of polypropylene sheets, and having a polypropylene surface as a liquid contact surface.