JPS6034381A - Heat-accumulating water tank - 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 relates to a heat storage water tank mainly used in a heat storage system.

In recent years, heat pump thermal storage systems that use late-night electricity have been used in building heating and cooling equipment to correct the imbalance in power supply and demand, or to operate cooling chillers at high efficiency.

A heat storage water tank is mainly used as the heat storage part.

A conventional heat storage water tank has a water tank body formed of concrete at a suitable location in the basement of a building, and various waterproof and heat insulating linings are provided on the inner surface of the water tank body. However, the history of such thermal storage water tanks is short, and there are considerable problems.

For example, there are problems with peeling of waterproof and heat insulating lining layers and chemical resistance of waterproof layers.

Generally, polyurethane foam, which is foamed at the time of construction on site, has excellent workability and heat insulation properties as a heat insulating layer, and it is conceivable to use this as a heat insulating layer for the lining of a heat storage water tank. However, since the insulation properties of polyurethane foam are impaired by water penetration, a waterproof layer is required for this polyurethane foam layer, and a common waterproof mortar (cement mortar) can be considered for this. When this J: Una insulation and waterproof lining is installed, durability is required for the heat storage tank. Its durability is determined by the fact that the water stored in the thermal storage tank is mixed with disinfectants and disinfectants, and that the water temperature is generally within the range of 5 to 25 °C in summer. Repeated daily fluctuations with a difference of 12'C (1':), iJ
: It is necessary to take into consideration the repeated daily fluctuations of about 15°C in temperature within the range of 40 to 60°C.

Regarding chemical resistance or corrosion resistance, for example, when chlorine is contained in water, calcium and sodium, which are components of conventional cement mortar, react with chlorine to produce calcium chloride and sodium chloride. However, there is a problem of neutralizing and deteriorating the mortar layer. Regarding temperature changes, the problem is whether the adhesiveness between the polyurethane foam layer and the cement mortar layer as a waterproof layer is sufficient. According to experiments, when a polyurethane foam layer is formed on the inner surface of the aquarium body and a waterproof mortar (cement mortar) layer is constructed on the inner surface as a waterproof tank,
Cracks occur in the mortar layer, allowing water to enter through the cracks.
It was found that water accumulates in the polyurethane foam layer, and the insulation effect decreases significantly after a certain amount of time.

Moreover, cracked areas tend to expand due to temperature changes, that is, changes in temperature due to heat input and output, which is the original role of the heat storage tank, and the adhesion between the polyurethane layer and the waterproof mortar layer decreases. It was found that deterioration (relatively) leads to peeling in () period. Sundabetsu (
(Polyurethane foam and expanded polystyrene produced as boards in factories can also be considered.These can be foamed on-site.
,', Although there is a difference in the TZ plane, the heat insulation properties are similarly good.

SUMMARY OF THE INVENTION An object of the present invention is therefore to provide a heat storage water tank that can ensure good heat insulation for a long period of time due to a polyurethane foam layer or a foamed polystyrene layer (which is excellent in terms of labor).

1ill: The structure of the hot water tank of this invention is a heat storage water tank in which the heat insulating layer provided on the inner surface of the water tank body is formed of rigid polyurethane foam or expanded polystyrene, and -11 on both sides of the heat insulating layer or on the water storage side. It is characterized by having a water-based epoxy resin mortar layer applied to the surface. The water-based epoxy resin of the water-based epoxy resin mortar used here is composed of a bisphenol A type epoxy as a main agent and a polyamide polyamine-based curing agent, each of which is emulsified and mixed at the time of use. This polyamide amine curing agent is superior to polyurethane and polystyrene. Water-based epoxy resin mortar is obtained by mixing bone phase (cement-based filler) with this water-based epoxy resin. This water-based epoxy resin mortar is difficult to crack and has extremely low moisture permeability.
It has very strong adhesive strength and excellent chemical resistance.

According to the above structure of the present invention, since the water-based epoxy resin mortar layer is hard to crack, the long-term waterproofing effect is extremely good, and therefore the polyurethane foam layer or foamed polystyrene layer and the water-based epoxy resin mortar layer are It is difficult for water to enter between them. Further, since the adhesion between the water-based epoxy resin mortar layer and the polyurethane foam layer or the foamed polystyrene layer is extremely strong and there is no water intrusion, there is no separation between the bonded surfaces even if there is a temperature change. Furthermore, the water-based epoxy resin mortar layer is not soaked in chlorine or other disinfectants. Therefore, according to the present invention, it is possible to provide a highly durable heat storage water tank in which the good heat insulation properties of the polyurethane foam, layer, or foamed polystyrene layer are maintained for a long period of 11 days ft.

The adhesive strength between the polyurethane foam layer and the water-based epoxy resin mortar layer can also be confirmed from the following test results. The test was conducted using five test pieces in which water-based epoxy resin mortar a was adhered to a hard polyurethane foam layer corresponding to the lining of the heat storage water tank of the present invention, and a hard polyurethane foam layer as a comparative example considered as a conventional heat-insulating waterproof lining. Five guest peas were prepared with a layer of ordinary waterproof mortar attached to them, and their adhesion strength was investigated. The results are shown in the table below.

The middle value in Table 1 is Kyf/ci, and the fracture surfaces of the test pieces of the comparative example are all interfacial peeling between layers, and the fracture surfaces of the test pieces corresponding to this invention are all polyurethane foam parts. It was broken. From this result, it can be seen that the adhesive strength between the polyurethane foam layer and the water-based epoxy resin mortar layer in the present invention is much superior to that in the comparative example, and that peeling on the W surface between the layers is unlikely. No. 11-1- relates to the adhesion between polyurethane foam and water-based epoxy resin mortar, but it has been experimentally confirmed that the adhesive strength between expanded polystyrene and water-based epoxy resin mortar is approximately the same.

In the structure of this invention, a water-based epoxy 41 mortar layer is applied on both sides of the heat insulating material layer.The heat storage water tank is generally installed underground in many cases, and in that case, groundwater flows from the outer surface of the concrete water tank body. There is no point in dealing with what is percolating. However, if the heat storage water tank is installed under conditions where underground water penetration does not need to be taken into consideration, this is not necessary, and therefore it is sufficient to install a water-based epoxy resin mortar layer only on one side of the water storage side of the insulation layer. It's good.

This invention will be explained in detail below.

Example 1 This heat storage water tank has 1 layer on the inner surface of the concrete water tank body.
112, a water-based epoxy resin waterproof layer, a water-based epoxy (ileum mortar layer, a rigid polyurethane foam layer, a water-based epoxy caustic mortar layer, and a water-based epoxy 9-layer layer) were sequentially formed.

The 111,111th I\-based epoxy resin waterproofing layer uses commercially available water-based Epogin resin (trade name: Hydro Ebogishi, Nippon Jitsukou Co., Ltd.), and the emulsion is mixed with cement-based filler. , the coating thickness is 1
It is painted so that the thickness is around +nm.

After painting, let it air dry for 4-5 hours before applying the next layer.

No. 2 [21 water-based epoxy resin mortar layer C] is a mixture of water-based epoxy resin 1ffi and bone (), which is a commercially available water-based epoxy resin mortar layer (trade name: Nippon Jikko Co., Ltd. product name "Hydromortar"). ), and this composition is described in Japanese Patent Publication No. 55-152633 (Japanese Patent Publication No. 152633) 7
770604) is disclosed in the publication. Apply this with a trowel (or brush or spray) to a thickness of 1 to 1.5
It is said to be mm. After application, leave for 12 to 15 hours before applying the next layer.

The third rigid urethane foam layer is a commercially available rigid polyurethane foam that foams when sprayed on site and has a density of 0.035 g/Cc. This was constructed so that the thickness was about 4 om. After construction 1
After natural curing for 2-15 hours, apply the next layer.

The water-based epoxy resin mortar layer No. 4 and 11 is the same as the second mortar layer, and is troweled to a thickness of 2 to 3 am. This is also left to stand for 12 to 15 hours before applying the next layer.

The fifth water-based epoxy resin layer is made by brushing (or spraying) a commercially available water-based epoxy resin (product name: "Hydroepoxy" by Nippon Jitsukou Co., Ltd.) to a thickness of about 0.1 to 15 mm. It is. After the construction of this 5th layer, the total curing period is about 1 at a temperature of about 20'C.
I left it for a week before using it.

The thermal storage water lining constructed in this way has not experienced any cracking or peeling even though it has been in use for 14 to 6 months. Because the water is highly airtight and working inside the layer is dangerous, it is difficult to use odor or toxic materials, but in this storage;
There is no problem at all with the water-based epoxy resin used in the ζ aquarium and other 6-layer compositions in 4 sizes.

In Example 1, 1 year and 6 months have passed since the elliptical construction, but there are about 30 similar construction examples in which 1 year and 6 months have passed since the construction. There are no cracks, peeling, etc. (7).

Example 2 This example is an example of a structure in which the second water-based epoxy resin mortar layer in Example 1 is omitted, and the construction method is almost the same except for the step of the omitted layer. 1 No. 1 @ “Layer 1 is a water-based epoxy resin waterproof layer with a thickness of 1.5 m.
The second layer is a rigid polyurethane foam layer that is foamed in place and has a thickness of 50 mm, the third layer is a water-based epoxy resin mortar layer that is 51 nm thick, and the fourth layer is a water-based epoxy resin mortar layer. The thickness is 0.25 to 4 mm (two coats).

Example 3 In this example, instead of the rigid polyurethane foam layer formed on site in Example 1, a rigid polyurethane foam produced as a board in a factory was used! It was cut and constructed according to the site, and all other layers are exactly the same.

Example 4 In this example, instead of the rigid polyurethane foam layer foamed on site in Example 2, foamed polystyrene produced as a board at a factory was cut and constructed according to the site, and the other layers were completely It's the same.

In Example 2.3.4 described above, each insulation layer is also effectively waterproofed and maintains its original good insulation properties for a long period of time.

In the above embodiment, the water-based epoxy resin waterproofing layer constructed between the concrete side and the water-based epoxy resin mortar layer is made of a commercially available synthetic resin emulsion coating film waterproofing material, such as vinyl chloride ethylene vinyl acetate copolymer, vinyl acetate Ethylene copolymer, ethylene styrene butadiene rubber copolymer, acrylic acid ester butadiene rubber copolymer, etc. may be substituted.

Patent applicant: Chugoku-Shikoku Beston Co., Ltd. Nippon Jikko Co., Ltd. Representative Tetsu Kiyomizu and 2 others

Claims (1)

[Claims] (1) In a heat storage water tank where the heat insulating layer provided on the inner surface of the water tank body is formed of rigid polyurethane foam or expanded polystyrene, a water-based epoxy resin mortar layer is applied to both sides of the heat insulating layer or the water storage side of the heat insulating layer described in 1. A heat storage water tank characterized by: