JPH0129698B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite board, and more particularly to a composite heat insulating board made by laminating a polystyrene foam board and a calcium carbonate foam board reinforced with inorganic fibers. The purpose is to propose a composite heat insulating board with extremely high heat insulating properties that improves the shortcomings of polystyrene foam boards such as low heat resistance, flammability, solvent solubility, and brittleness.

Polystyrene foam boards have extremely low thermal conductivity, high compressive strength, low moisture absorption, water resistance, shape retention, etc., and are widely used as insulation materials for buildings, warehouses, tanks, pipes, etc. However, it has drawbacks such as having a low heat resistance (approximately 80°C), being flammable, easily soluble in solvents such as benzene, and being mechanically fragile. Therefore, when polystyrene foam boards are used as a heat insulating material, there are often restrictions on where they can be used or under what conditions they can be used.

This invention was made in view of the above problems, and its gist is a composite board made by laminating a calcium carbonate foam board reinforced with inorganic fibers on at least one surface of a polystyrene foam board.

Calcium carbonate foam board reinforced with inorganic fibers (hereinafter referred to as charcoal board in this invention)
is calcium carbonate and glass fiber as a reinforcing material,
It is made by foam-molding inorganic fibers such as asbestos and carbon fibers with a small amount of synthetic resin binder. This charcoal plate, for example, asbestos as a reinforcing material,
A product using vinyl chloride resin as a binder (manufactured by Fuji Kasei Kogyo Co., Ltd., product name: Roxel Board)
has a thermal conductivity of 0.035 Kcal/mhr°C, which is inferior to that of polystyrene foam board (Styrofoam EK manufactured by Asahi Dow Co., Ltd. has a thermal conductivity of 0.023 Kcal/mhr°C), but
It can withstand high temperatures of 300℃, is nonflammable, is not brittle against impact or bending, and is insoluble in solvents, which has physical properties that compensate for the shortcomings of polystyrene foam boards.

Therefore, a composite board made by laminating a carbonaceous board on the surface of a polystyrene foam board has extremely high performance that is almost the same as that of a polystyrene foam board alone, although its insulation performance is slightly lower. , the heat resistance, fire resistance, solvent solubility, brittleness, etc. of the surface layer are improved, and the areas and conditions of use are significantly expanded. On the other hand, compared to the charcoal plate alone, the insulation performance is improved and the weight is reduced (polystyrene foam board 30~
40Kg/m ³ , carbonaceous plate 90-120Kg/m ³ ), making it possible to reduce costs and expand the usable range as a heat insulating material.

Examples will be described below with reference to the drawings.

Composite board A shown in Figure 1 consists of a polystyrene foam board 1 with a thickness of 25 mm and a charcoal plate 2 with a thickness of 10 mm on one surface.
It is made by bonding them with adhesive and laminating them.

This composite board A has improved brittleness compared to a polystyrene foam board alone, and has superior heat insulation performance compared to a charcoal plate of the same thickness alone. Therefore,
As shown in FIG. 2, an outer wall can be formed by applying mortar 3 directly to the surface of a charcoal board 2 that is attached as a heat insulating material to the outside of a wooden building and placed on the outdoor layer. The charcoal plate 2 supports the weight of the mortar 3, and also has a high adhesive strength with the mortar 3 and has practical strength without using lath wire mesh, etc. It is integrated with the polystyrene foam board of the inner layer, and has high heat insulation and moisture resistance. It can be said that it is effective.

The composite board B shown in FIG. 3 is the composite board A shown in FIG.
A thin steel plate 4 is adhesively laminated on two sides of a charcoal plate. In this embodiment, two adjacent edges of the thin steel plate 4 overhang from the edge of the composite plate A by a width of about 10 mm, and an overhanging edge 5 is provided.

FIG. 4 shows an example of thermal insulation using the composite plate A shown in FIG. 1 and the composite plate B shown in FIG. 3. This is done by attaching four curved composite plates A to the outer surface of a cylindrical tank 6 with the charcoal plate 2 inside, and four curved polystyrene foam plates 7 with a thickness of 50 mm on the top surface. It is constructed by attaching four composite plates B to the upper surface of the composite plate B in a curved manner with the steel plate 4 facing outward. The positions of the joints 8 between the inner layer composite plates A, the joints 9 between the middle layer polystyrene foam plates 6, and the joints 10 between the outer layer composite plates B are approximately equal to each other between the upper and lower layers.
The synthetic resin screws 11 are screwed into the lower layer composite board A and the polystyrene foam board 7 from the outside near the circumferential ends of the middle layer polystyrene foam board 7 and the outer layer composite board B at an angle of 45 degrees. The layers are connected, and the three-layer composite board A, polystyrene foam board 7, and composite board B are integrated to form an annular shape. At the same time, the overhanging edge 5 of the steel plate 4 located on the outside of the composite plate B is overlapped with the surface of the adjacent composite plate B, and the space between them is bonded with an adhesive, so that the joint 10 is completely closed.

In this usage example, even if the tank 6 reaches a high temperature of 80°C or higher, the material in contact with it is the charcoal plate 2 of the composite plate A, which has high heat resistance and low thermal conductivity, so the inner layer The polystyrene foam boards 1 and 7 are less likely to be damaged by heat. Further, since the outer surface is covered with a steel plate 4 and has high rigidity, and the charcoal plate 2 is arranged inside the steel plate 4, it is difficult to be damaged even if it is heated or subjected to impact from the outside.

The synthetic resin screw 11 is made of a material with high strength such as polyethylene, and has a diameter of 5.
~10mm, length 50~150mm, number of threads 3~10/10
cm, if the thickness of the tip and root part is not much different, the connection strength will be high, and if the joint positions between the upper and lower layers are staggered and the upper and lower layers are connected by screws, the whole will become annular and bonded. It can be installed easily and reliably even without strong adhesion using adhesives, and unlike metal materials, there is no drop in insulation properties.
Furthermore, when the temperature changes and the wall dimensions expand and contract like in this tank, adhesive bonding tends to cause peeling, but if it is installed in an annular shape, the insulation material will expand and contract as the wall expands and contracts. Will not be damaged or fall off. Also, if an overhanging edge 5 is provided and the joint is closed by overlapping it,
This is more preferable since the airtightness of the heat insulating material layer is improved.

The usage example shown in Fig. 6 is a low temperature cylindrical tank 1.
The composite plate A is curved and attached to the outer surface of the plate 2 with the charcoal plate 2 facing outside. One edge of the composite plates A and A, whose end surfaces are in contact, is made by cutting out 2 parts of the charcoal plate into a band shape, and the other edge is made by cutting out 1 part of the polystyrene foam board into a band shape, and the cut parts are joined together and joined together. At the joining part, a screw nail 11 made of synthetic resin is screwed from the outside to the polystyrene foam board 1 of the lower layer, so that the entire assembly is attached in an annular shape.

In this insulation structure, since the wall surface of the tank 12 is at a low temperature, the polystyrene foam board 1 in contact with it will not be damaged, and the outside is covered with a heat-resistant, nonflammable, and non-fragile charcoal board 2. Therefore, practical strength can be maintained without providing a protective layer on the outer surface. Further, by using the screw nails 11, the installation work is simplified, and there is no possibility of deterioration of heat insulation or damage caused by expansion and contraction of the tank wall surface.

The polystyrene foam board used in this invention has a density of
20-60Kg/ ^cm3 , preferably 25-40Kg/ ^m3 , and the thickness is usually 25mm-100mm, preferably an extruded foam molded plate. In addition, when attaching it to a curved surface, or when the wall surface to which it is attached expands and contracts or is exposed to extremely low temperatures, it is necessary to
It is preferable to use a foam board having an elongation of ~30% (for example, Styrofoam Flex, a product of Asahi Dow Co., Ltd.). An elongation at break of 7-30% allows for easy bending without cracking or breaking.
It absorbs and alleviates the expansion and contraction of the attached wall surface and the contraction due to low temperatures by its own elongation, making it difficult to cause cracks and damage, and preventing the joint gap from expanding.

The purpose of this composite board can be achieved if the charcoal plate is usually about 10mm thick. However, it can be selected within the range of about 5 mm to 20 mm depending on the purpose of use. When laminating with a polystine foam board, adhesives such as epoxy, urethane, rubber, and vinyl acetate latex-added mortar can be used to easily and firmly bond. Among these, epoxy-based, urethane-based, and latex-added mortars are preferred because they have high heat resistance.

The composite heat insulating board of the present invention is not limited to the one in which a charcoal plate is laminated on one surface of the polystyrene foam board mentioned in the example. If necessary, charcoal plates can be laminated on both sides.

The present invention is as described above, and this composite heat insulating board improves the drawbacks of polystyrene foam boards, and can achieve high heat insulating properties, weight reduction, and cost reduction that cannot be achieved with charcoal plates alone. , it can be used in a wide range of heat-insulating areas without being restricted by usage conditions.

[Brief explanation of drawings]

The drawings show embodiments of the invention,
Figure 1 is a longitudinal sectional view of a composite plate, Figure 2 is a sectional view of an external wall using the composite plate in Figure 1 as a heat insulator, and Figures 3a and b are sectional views and corners of a composite plate made of laminated steel plates. Figures 4 and 5 are a cross-sectional view and partially enlarged cross-sectional view when the outer circumferential surface of the tank is insulated, and Figure 6 is a partial cross-sectional view of another embodiment in which the outer circumferential surface of the tank is insulated. be. 1... Polystyrene foam board, 2... Inorganic fiber reinforced calcium carbonate foam board, 3... Mortar,
4... Steel plate, 5... Overhanging edge, 6... Tank, 7
...Polystyrene foam board, 8,9,10...Joint, 11...Synthetic resin screw nail, 12...Tank.
A... Composite board, B... Composite board made by laminating steel plates.

Claims (1)

[Scope of Claims] 1. A composite heat insulating board characterized by laminating a calcium carbonate foam board reinforced with inorganic fibers on at least one surface of a polystyrene foam board. 2. The composite heat insulating board according to claim 1, wherein the polystyrene foam board has a breaking elongation characteristic of 7 to 30% in one direction.