JPS5923137Y2 - roofing material - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to cement-based roofing materials.

When manufacturing cement-based board materials, a water additive mixture of cement, silica sand, and fine aggregate is formed into a board shape, and this molded product, that is, the raw board, is autoclaved and cured in high-temperature, high-pressure saturated steam. It has been known.

According to the Karu production method, curing is forced, so
In addition to the advantage of improving production efficiency, silica sand reacts with the limestone in cement to produce tobermorite or zonolite, which is a strong crystal, which is also advantageous in improving the strength of the board.

When using cement-based board materials as roofing materials, the roofing material may deform due to repeated water absorption and drying, or the free lime in the roofing material may ooze out to the surface due to water absorption, and this may be absorbed into the air. It is necessary to prevent the phenomenon of reacting with carbon dioxide gas to produce calcium carbonate, that is, the efflorescence phenomenon.
It is required to provide sufficient waterproofness to the board material.

As a method of imparting waterproofness to the above cement-based board material,
It is possible to mix a water repellent, such as a metal stearate, into the above raw materials, but in this case, the water repellent inhibits the hydration reaction or calcium silicate reaction of cement, resulting in a decrease in the strength of the board. There are concerns.

Also known is a method of applying a plastic paint to the surface of the raw original plate described above and baking this plastic paint during the autoclave curing to form a film.

In this method, heating during autoclave curing is
It is used to form plastic films, and it is advantageous in terms of process since no special baking is required in the film forming process.

However, in this case, it is impossible to provide a waterproof membrane over the entire surface of the board.

In other words, when plastic paint is applied to the entire surface of a board, during autoclave curing, the moisture vapor in the original board is trapped inside the board by the plastic coating, and the pressure of this vapor increases rapidly, resulting in Inconveniences such as formation of numerous pinholes in the coating film cannot be avoided.

The cement-based roofing material according to the present invention was devised in view of the above-mentioned points, and a cement-based colored layer containing a water repellent is provided on the surface of a cement-based plate-like base material. A plastic coating is provided on the peripheral side surfaces and the back surface of the part, and the entire part is cured and hardened by high-temperature and high-pressure steam curing.

The present invention will be explained below with reference to the drawings.

In the figure, reference numeral 1 denotes a cement-based plate-like base material part, which has a structure in which a mixed raw material of cement I, silica sand, and fine aggregate is hardened by a hydration reaction.

2 is a cement-based colored layer containing a water repellent such as calcium stearate, and is integrally bonded to the surface of the base material 1 by a hydration reaction.

This cement-based coloring material contains cement, silica sand, pigment,
A compound containing calcium stearate is used.

Reference numeral 3 designates a plastic coating film baked onto the peripheral side surface and back surface of the base material 1, and is made of, for example, acrylic resin.

To manufacture the above roofing material, a water additive of a mixed raw material of cement, silica sand, and fine aggregate is formed into a plate shape, and a mixture of cement, silica sand, and pigment is applied to the surface of the formed product, that is, the plate-shaped upper base material. , calcium stearate, and a cement-based coloring agent added with water are applied, and an acrylic resin emulsion is applied to the peripheral side and back surface of the plate-shaped upper substrate, and then,
Curing treatment is performed by autoclape.

In this case, the plate-shaped substrate is hardened by the hydration reaction of the cement and the calcium silicate reaction between the silica sand and the lime content in the cement, and the cement-based coloring material layer is also hardened by the same reaction, and the coloring material layer and the plate-shaped substrate are hardened by the same reaction. The boundary with the substrate is firmly bonded by the above reaction.

On the other hand, plastic paints are baked into a film due to the heat during autoclave curing.

During curing, moisture vapor from the plate-like substrate can be completely removed from the cement coloring material layer, and the occurrence of pinholes in the plastic coating can be eliminated.

As mentioned above, in the roofing material according to the present invention, waterproofness on the surface is guaranteed by the water repellent in the cement-based colored layer, and waterproofness on the surrounding side and back surfaces is guaranteed by the plastic baked film.

Therefore, since the entire surface is waterproof, it is possible to reliably prevent water from entering the plate-like base material portion.

Furthermore, since the plate-like base material part does not contain a water repellent and has a strong structure, it is possible to provide a roofing material with excellent mechanical strength.

In addition, the heat during autoclave curing can be used for the hardening treatment of the cement-based colored layer and the baking of the plastic coating film, and no special heating process is required, which is advantageous in terms of manufacturing efficiency.

[Brief explanation of drawings]

The drawing is an explanatory cross-sectional view showing the roofing material of the present invention. In the figure, 1 is a plate-like base material part, 2 is a cement-based colored layer,
3 is a plastic coating film.

Claims (1)

[Scope of utility model registration request] A cement-based colored layer containing a water repellent is provided on the surface of the cement-based plate-like base material, and a plastic coating is provided on the surrounding sides and back surface of the base material, and the entire surface is cured with high-temperature and high-pressure steam. A roofing material that is cured and hardened.