JPS60180974A - Heat insulating slate - 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 TECHNICAL FIELD The present invention relates to insulating slates, and more particularly to novel corrugated asbestos slates for use in roofing and having excellent insulating properties.

Prior Art Traditionally, there are two types of slate used for roofing: corrugated asbestos cement slate and corrugated plastic slate. However, assuming heat insulation effect, heat resistance, weather resistance,
From the viewpoint of light-shielding properties, corrugated asbestos slate is generally the mainstream.

However, even with commonly used corrugated asbestos-cement slate or reinforced corrugated slate made by impregnating rags, waste wire, chopped glass fiber, or asbestos with a synthetic resin adhesive, the insulation effect is only temporary. Go out and
If exposed to sunlight for a long time, the insulation effect will gradually disappear.

In order to find out the reason for this, the present inventor finally came to the following conclusion as a result of various species studies. In other words, the asbestos that is the main material of corrugated asbestos cement slate is 0.13 Koal/
Even if the thermal conductivity of hrm'c is low, its heat absorption rate is 0.96 or higher, so the surface of the corrugated slate constantly absorbs radiant heat from the sun, raising the surface temperature of the asbestos slate. . Over time, as the amount of heat entering and exiting the surface of the corrugated asbestos slate reach equilibrium, the surface temperature of the slate becomes constant. At that time, the sun's radiant heat absorbed by the corrugated slate passes directly into the room, and the insulation effect of the slate is almost completely eliminated. The indoor temperature will then gradually increase with the amount of time the roof is exposed to sunlight until thermal equilibrium is reached. At that time, the temperature difference between indoors and outdoors becomes smaller. And even at night, waveform sled)K
A portion of the absorbed heat is released into the room, so the indoor temperature does not drop easily.

Purpose of the Invention In view of the above points, as a result of study, the present inventor found that there are the following three methods for improving the heat insulation effect of corrugated asbestos slate. That is, (a) reducing the thermal conductivity of the corrugated slate, (b) reducing the heat absorption rate of the corrugated slate, and (0) improving the reflectance of the corrugated slate.

Therefore, one object of the present invention is to form on the surface of a corrugated asbestos slate a multilayer insulating mixture with low thermal conductivity,
The object of the present invention is to provide a heat insulating slate that can prevent heat conduction to the maximum extent.

Another object of the present invention is to provide an insulating slate with increased reflectivity using a white insulating mixture.

Another object of the present invention is to provide an insulating slate with a high scattering reflectance due to the insulating mixture surface layer having a uniform crystal distribution.

DESCRIPTION OF THE INVENTION Based on the above, the present invention uses corrugated asbestos slate as a base material layer, and on the surface thereof, a pickle mixture mainly composed of dolomite or magnesite and white cement are kneaded with water in a predetermined mixing ratio. It is characterized by a coagulation coating with an adhesive surface layer.

It is another feature of the invention that serpentine or calcite is further added to the above pickle mixture.

As described below, the heat insulating slate of the present invention configured as described above has low heat absorption and high reflectance in addition to low thermal conductivity, and thus exhibits excellent heat insulating properties.

The above-mentioned ingredients are usually kneaded in powder form.

In the above, the amount of white cement blended is not particularly limited, and is preferably around 3% of the total mixture forming the surface layer. If the amount is less than %, the coating strength of the surface layer will be reduced and the bonding property with the base material will be poor, and if it is more than h, the heat insulation effect will be significantly insufficient. Furthermore, dolomite and magnesite can be used in either fired or unfired form, or they can be used as a mixture of the two in a predetermined ratio. There is no particular limitation on the mixing ratio of unfired and smoked products, and it is 1:3.
A blending ratio of is preferred. Dolomite and magnesite are both white and form rhombohedral crystals, each with a reflectance of 1.
．． 68n and 1.7 On, it has an excellent reflection effect. Furthermore, serpentine has a monoclinic system and has a reflectance of 1.
．． 55n, calcite is rhombohedral and has a reflectance of 1.66.
Both types of n and n show excellent reflective effects.

Moreover, the above-mentioned dolomite and magnesite all have low thermal conductivity. Dolomy) (Mg(Oa003),
) thermally decomposes into calcium oxide, magnesium oxide and carbon dioxide9, while magnesite thermally decomposes into magnesium oxide and carbon dioxide. Calcium oxide and magnesium oxide have low thermal conductivity and heat absorption, and the carbon dioxide produced by smoking makes the mixture porous, further improving its heat insulating effect.

The above and other objects, features and advantages will become more apparent when the detailed description is given in conjunction with the accompanying drawings.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 is a perspective view of a corrugated asbestos slate according to an embodiment of the present invention. The corrugated asbestos slate 1 is composed of a base layer 10 and a covering surface layer 20. As shown in FIG. The base material layer 10 is mainly made of chopped glass fiber, asbestos, and a synthetic resin adhesive, and is formed into a corrugated acid part by a known method. surface layer 20
is a 1:1 ratio of dolomite, magnesite, and white cement.
It is formed by coating the surface of the base material layer 10 with a mixture mixed with water at a ratio of 1:1, and dolomite and magnesite are all composed of 30% unfired granular crystals and 70% Use roasted powder. 23 in FIG. 2 indicates a mixed solidified body of the roasted powder and cement.

FIG. 2 is an enlarged cross-sectional view of a portion of FIG. 1.

In Fig. 2, 21 is an unburnt dolomite crystal grain;
2 is an unburnt magnesite crystal grain, and 23 is a porous body made of a mixture of white cement, seeded dolomite, and burnt magnesite.

Therefore, when the corrugated asbestos slate 1 of the present invention is exposed to sunlight, the unburned dolomite 21 and the unsmoked magnesite 22 will diffusely reflect the incident light, creating a porous structure with low thermal conductivity and low heat absorption. The body 23 exhibits an excellent thermal insulation effect by blocking the introduction of heat.

The above corrugated asbestos slate 1 of the present invention was actually laid on the roof of a three-story building, and the outdoor and indoor temperatures were measured, and the results are shown in Table 1.

Table 1 As shown in Table 1, if the asbestos slate 1 of the present invention is used, the indoor temperature will not rise even in a true star, and 1
There is almost no difference in temperature between the floor and 3 PL, showing excellent insulation effects.

Effects of the Invention As described above, the present invention uses crystalline dolomite and magnesite, which have high reflectivity, as components of the coating surface layer of slate, and reflects heat, and also uses pile-fired dolomite, which has low thermal conductivity and low absorption rate. By using a mixture of magnesite and white cement to block the introduction of heat, the insulation is much better than the commonly used asbestos slate.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a corrugated asbestos slate showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a part of FIG. 1. 1... Corrugated asbestos slate, 10... Base material layer 6.20
...Surface layer, 21...Dolomite crystal grains, 22...
・, magnesite crystal grain, 23... porous body. 1 other person

Claims (5)

[Claims] (1) A heat insulating slate consisting of an asbestos slate base layer and a covering surface layer formed by coating the surface of the base layer, in which the surface layer is a pickled mixture mainly composed of dolomite, magnesite, or a mixture thereof. A heat insulating slate made by mixing a mixture of and white cement with water. (2) The heat insulating slate according to claim 1, wherein the base material layer is made of glass fiber and asbestos impregnated with a synthetic resin adhesive. (3) The insulating slate according to claim 1, wherein the amount of the white cement is a percentage of the weight of the mixture. ′ (4) Unfired granular crystals of the above dolomite 30
% by weight and 70% by weight of smoky powder. (5) Unfired granular crystals of the above magnesite 3
The heat insulating slate according to claim 1, characterized in that the heat insulating slate is composed of 0% by weight of scorched powder and 70% by weight of calcined powder.