JPS6210107Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat insulating corrugated plate having good heat insulation properties and excellent mechanical properties.

Buildings that require insulation such as cold storage warehouses, refrigerators,
BACKGROUND ART Various panels are used to form insulating walls in transportation means that require insulation, such as refrigerated ships. The insulation material in this panel is made of fibers such as glass fiber or foamed resins such as polyurethane foam or polystyrene foam, but insulation materials alone lack the strength as a structural material, and usually structures with high mechanical strength are used. Members are used together. For example, sanderch boards such as metal plates, asbestos slate boards, and wooden boards that have a heat insulating material inside are often used.

Corrugated sheet is a type of panel. Corrugated sheets have a higher load capacity than flat sheets and are widely used as roofing and sidewall materials. However, corrugated sheets with heat insulating properties are not well known. For example, it has been extremely difficult to manufacture a sandwich corrugated sheet having a heat insulating layer therein, and it has been difficult to commercialize it due to cost considerations. Previously known insulating corrugated sheets were asbestos slate corrugated sheets having a layer of polystyrene foam on one side. This heat-insulating corrugated sheet is manufactured by molding polystyrene foam into the same corrugated asbestos slate corrugated sheet and bonding it to the asbestos slate corrugated sheet with an adhesive. However, this heat-insulating corrugated sheet requires molding of polystyrene foam and adhesive processing, and also has the disadvantage that it is susceptible to peeling due to deterioration of the adhesive. As asbestos slate boards have water absorption properties, adhesives must be highly water resistant.
Since the adhesion process requires a lot of manpower, the manufacturing cost is quite high. moreover,
A further problem was that the heat insulation performance was not sufficiently high. That is, the thermal conductivity of normal polystyrene foam is 0.03Kca/
m·hr·°C, and those obtained by cutting and press-forming this into a corrugated shape had higher thermal conductivity and lower thermal insulation properties.

The present inventor further conducted various studies in order to find a heat insulating corrugated plate that has good heat insulation performance and is easy to manufacture, and as a result, he discovered a heat insulating corrugated plate having a hard polyurethane foam layer on one side. Rigid polyurethane foam has lower thermal conductivity (on the order of 0.017 Kca/m·hr·°C) and has better weather resistance than polystyrene foam.
As a structural member, fiber reinforced cement such as asbestos slate corrugated sheet is suitable, and the present invention is an insulating corrugated sheet having a hard polyurethane foam layer on one side. FIG. 1 is a partial sectional view showing an example of the heat insulating corrugated plate of the present invention. A hard polyurethane foam layer 2 is present on one side of an asbestos slate layer 1, and the entire surface is corrugated. As the fiber-reinforced cement, in addition to asbestos slate, inorganic cements having various reinforcing fibers such as glass fiber-reinforced cement and metal wire-reinforced cement can be used. The rigid polyurethane foam is a polyurethane foam having closed cells manufactured from polyisocyanates and an active hydrogen-containing compound, and may be a so-called hard polyisocyanurate foam that partially contains isocyanurate bonds.

The thickness of the fiber-reinforced cement layer is suitably 2 to 12 mm, and the thickness of the hard polyurethane foam layer is suitably 4 to 50 mm. The shape of the corrugated sheet in fiber-reinforced cement, such as the pitch of the waves, the total thickness, the length of the corrugated sheet, and the total width of the corrugated sheet, is not particularly limited. Convenient to use. In particular, it is convenient to use commercially available asbestos slate corrugated sheets as raw materials, so the thickness of the fiber-reinforced cement layer is 4 to 8 mm.
is appropriate. Furthermore, a ribbed corrugated plate commercially available as an asbestos slate corrugated plate can also be used. Since the rigid polyurethane foam layer is formed to match the fiber-reinforced cement corrugated sheet, its shape follows the fiber-reinforced cement corrugated sheet, and its thickness is determined by the required thermal insulation performance and required mechanical properties, and is usually is preferably 6 to 20 mm.

Unlike polystyrene foam, rigid polyurethane foam is a thermosetting resin foam, so
It is not possible to secondary form a foam plate into a corrugated plate. Furthermore, cutting out a corrugated sheet from a slab of rigid polyurethane foam results in extremely low utilization of the foam, making it practically unusable. Therefore, the heat insulating corrugated sheet of the present invention is manufactured by foaming and curing a rigid polyurethane foam stock solution on a fiber-reinforced cement corrugated sheet. That is, it is manufactured by uniformly spraying a hard polyurethane foam stock solution onto a fiber-reinforced corrugated sheet and then foaming and curing it as it is. Conventionally, there was no known means of dispersing rigid polyurethane foam stock solution extremely uniformly, but the inventor of the present invention has discovered a new method of dispersing using a brush roll (see Japanese Patent Application No. 53-26633). . Of course, it is also possible to spray using a conventional spray method, but it is preferable to use this method in order to spread evenly.

One of the features of manufacturing the heat insulating corrugated sheet of the present invention is that the hard polyurethane foam stock solution is uniformly and thinly spread on the fiber-reinforced cement layer and is allowed to freely foam and harden without using a mold. Of course, a mold can be used to form a hard polyurethane foam layer between the mold and the fiber-reinforced cement layer, but using a mold makes it difficult to align (for example, align the phases) the mold and the fiber-reinforced cement layer. It is difficult to do so, and there are also drawbacks such as uneven coloring on the surface if the raw solution flows parallel to the surface of the fiber-reinforced cement layer. Free foaming does not require a mold and the foam moves only perpendicular to the surface, so this problem does not occur. However, forming a free-foaming, uniformly thick rigid polyurethane foam layer requires extremely uniform distribution of the stock solution. The present invention was created by solving this problem of dispersion.

A second feature of this method is that it does not require the use of adhesives. That is, the hard polyurethane foam stock solution has adhesive properties and is bonded together by foaming and hardening on the fiber-reinforced cement corrugated plate. This adhesive has good water resistance and is less likely to cause problems such as peeling during use. Moreover, this method does not require any adhesive processing work, and the manufacturing method is simple, requiring less manpower and lowering manufacturing costs. Further, decorative paper, film, etc. can also be adhered to the surface of the rigid polyurethane foam during or after manufacturing the heat insulating corrugated sheet. Furthermore, various treatments and processing such as painting and waterproofing can be performed on the surface.

[Brief explanation of the drawing]

FIG. 1 shows a cross-sectional view of the heat-insulating corrugated plate of the present invention, which consists of a fiber-reinforced cement layer 1 and a hard polyurethane foam layer 2.

Claims (1)

[Claims for Utility Model Registration] 1. A fiber-reinforced cement layer with a thickness of 2 to 12 mm and a thickness formed integrally by foaming and curing a hard polyurethane foam stock solution on one side of the fiber-reinforced cement layer without using an adhesive. A heat-insulating corrugated sheet made of a hard polyurethane foam layer with a diameter of 4 to 50 mm. 2. The heat insulating corrugated board according to claim 1 of the utility model registration claim, characterized in that the fiber-reinforced cement is asbestos slate.