JPS5810229B2 - roofing material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roofing material with excellent weather resistance, heat retention, and durability.

Corrugated galvanized iron sheets have been used as roofing materials for a long time, but they have poor heat retention and are prone to corrosion.
Recently, roofing materials have been used that are made by laminating a heat insulating material such as asbestos on a metal plate such as an iron plate, and coating this with a resin such as acrylic resin.

Although this roofing material was improved in terms of heat retention, it was inferior in terms of water resistance, and its durability was unsatisfactory because water could pass through this resin layer and enter the interior, corroding the metal plates. .

Roofing materials are originally outdoors and are constantly exposed to sunlight, rain, wind, etc., and are required to have a wide range of performance requirements and to be able to withstand harsh conditions.

These required performances are enumerated as follows.

(1) Weather resistance (2) Water resistance and corrosion resistance (3) Chemical resistance (4) Heat retention (5) Toughness and excellent impact resistance, with no loss of these properties even at low temperatures.

(6) Excellent bending resistance and adhesive properties when laminating a heat insulating material and resin layer on a metal plate and bending it into a corrugated shape.

It is not easy to search for a roofing material that satisfies the various performances mentioned above.

As a result of extensive research into roofing materials having these various properties, the present inventors discovered that the object could be achieved by using polyester resin as the resin layer, and arrived at the present invention.

That is, the present invention provides a roofing material in which a metal plate, a fiber sheet-like heat insulating material, and a resin layer are sequentially laminated in this order.
~80 mol% (of the aromatic dicarboxylic acid component, terephthalic acid is 40 mol% or more) and 60 to 20 mol% of an aliphatic dicarboxylic acid component having 6 to 40 carbon atoms, and the glycol component has 2 to 40 carbon atoms. It is characterized by using a copolymerized polyester resin consisting of 8 glycols.

The structure of the roofing material of the present invention will be explained using the example of the drawings.
FIG. 1 is an example of a cross-sectional view of the roofing material of the present invention, in which 1 is a metal plate, 2 is an adhesive layer, 3 is a fiber sheet-like heat insulating material made of asbestos, glass fiber, etc., and 4 is the same material as described above. This is a resin layer made of polymerized polyester resin.

Further, 5 is a film layer for further improving weather resistance, and is provided as necessary.

Since the roofing material of the present invention has the above-described structure, it has excellent heat retention properties.

In addition, when bending the roofing material of the present invention into a corrugated shape, the copolymerized polyester resin layer 4 has good flexibility and good adhesion to the heat insulating material, so it does not crack or peel. There's nothing to do.

In addition, the fiber sheet-like heat insulating material 3 made of asbestos, glass fiber, etc. generally has low strength against bending, but the metal plate 1
Since it is supported by the resin layer 4 from both sides, it also has the advantage of not breaking or peeling during bending.

The metal plate 1 used in the roofing material of the present invention is usually a galvanized iron plate, but other metal plates, aluminum plates, etc. may also be used.

The fiber sheet-like heat insulating material 3 made of asbestos, glass fiber, etc. can be used regardless of whether it is a nonwoven fabric or a woven fabric.

In addition, the materials are not only asbestos fiber and glass fiber, but also
Natural fibers like cotton, linen, polyester, polyamide.

Synthetic fibers such as polyolefins and recycled fibers such as cellulose fibers can also be used.

Further, the adhesive 2 for bonding the metal plate 1 and the heat insulating material 3 is not particularly limited, and various adhesives such as epoxy adhesives and urethane adhesives can be used.

The use of fiber sheets for insulation is not only for heat retention;
This is because it has excellent flexibility and adhesiveness.

As mentioned above, the copolymerized polyester resin used for the resin layer 4 contains 40 to 80 mol% of an aromatic dicarboxylic acid component (terephthalic acid is 40 mol% or more of the aromatic dicarboxylic acid component) as a dicarboxylic acid component. A copolymerized polyester resin consisting of an aliphatic dicarboxylic acid component having 6 to 40 carbon atoms and 60 to 20 moles of an aliphatic dicarboxylic acid component having 6 to 40 carbon atoms, and a glycol having 2 to 8 carbon atoms as a glycol component is used.

Furthermore, it is preferable to use a crystalline copolyester resin having a heat of crystal fusion of 100 cm δ/g or more.

Examples of aromatic dicarboxylic acids other than terephthalic acid include isophthalic acid and naphthalene dicarboxylic acid, and examples of aliphatic dicarboxylic acids include adipic acid, azelaic acid, sebacic acid, decanedionic acid, dodecanedioic acid, and timoric acid.

In addition, glycol components include ethylene glycol, propylene glycol, trimethylene glycol, 1,4-
Butanediol, 1,5-bentanediol, 1,6-
Examples include alkylene glycols such as hexanediol and neopentyl glycol, alipidine glycols such as cyclohexanediol and cyclohexane dimetatool, and polyalkylene glycols such as diethylene glycol and triethylene glycol.

In particular, linear glycols are advantageous in that they yield assembling copolyester resins.

In addition, the copolymerization ratio of the aromatic dicarboxylic acid component and the aliphatic dicarboxylic acid component is 40 to 80:6 in the dicarboxylic acid component.
It is 0 to 20 (mol%).

If the aromatic dicarboxylic acid component is less than 40 molar percentage, the heat resistance, adhesiveness, and weather resistance of the copolyester resin produced will decrease.

If the aliphatic dicarboxylic acid component is less than 20 molar, the melting point will be high, resulting in poor workability such as flexibility.

Furthermore, the terephthalic acid component is among the aromatic dicarboxylic acid components.
It is necessary that the content be 40 mol% or more.

Terephthalic acid is 40 mol% in the aromatic dicarboxylic acid component
If it is less than 10%, physical properties such as strength and impact resistance will deteriorate.

The copolyester resin of the present invention is produced according to a conventional method.

For example, it is produced by adding an aromatic dicarboxylic acid or an ester-forming derivative thereof, a glycol, and a catalyst to a reaction vessel to perform a direct esterification reaction or transesterification reaction, and then performing a polycondensation reaction.

At this time, stabilizers, modifiers, colorants, etc. may be added.

Film layer 5 provided as necessary in the roofing material of the present invention
A film with excellent light resistance, such as a polymethacrylate film or a polyester film, is preferable.

By providing this film layer, weather resistance can be further improved.

Incidentally, pigment,
It is also possible to produce roofing materials incorporating colorants.

To manufacture the roofing material of the present invention, a fiber sheet-like heat insulating material is usually laminated on a flat metal plate using an adhesive, and a resin layer is applied thereon.

At this time, it is preferable to apply a hot melt coating method to the resin layer.

Of course, it is also possible to apply the resin in the form of an organic solvent solution or emulsion, but the hot melt coating method has a denser resin layer and superior water resistance.
Moreover, the adhesive property with the fiber sheet-like heat insulating material is also good.

Furthermore, since there is no need to evaporate solvent or water, there is an advantage that work efficiency is increased.

After the resin layer is formed, a film layer is provided if necessary, and the entire laminate is molded into an appropriate shape such as a corrugated shape, if desired.

At this time, the roofing material of the present invention can be molded with good workability without cracking or peeling.

Next, the present invention will be explained by implementing Shiogata.

In addition, the physical properties in Examples were measured as follows.

Reduced viscosity of polymer η sp/c Using a mixed solvent of phenol/tetrachloroethane = 6/4 (weight ratio), polymer concentration C = 0.1 g 10.25
dl, measured at 30°C.

(Unit: dl/g) The following physical properties were measured using a sample piece of mild steel plate (JISG-3141) treated with a zinc phosphate solution to a film thickness of 1.
A sample coated to a thickness of 5 to 20 μm was used.

It was irradiated with ultraviolet rays for 1000 hours using a weather-resistant weatherometer and visually judged.

No change in paint film ○, cracks occurred ×. Corrosion resistance It was measured according to the JIS-5400 measuring method.

The surface condition after being immersed in caustic soda for 500 hours was visually determined.

No abnormality ○, blister occurrence ×. ASTM-D- after being left at 50℃ and humidity of 98% or more for 100 hours using a humidity cabinet (manufactured by Toyo Seiki) according to Water Resistance NDS-2801.
It was determined by the substrate test according to 3359.

erichsen value It was measured according to the measuring method of JIS-Z-2247.

impact value It was measured according to the JIS-5400 measuring method.

(1/20.500gr) A flexible sample plate was bent 180 degrees and judged based on the state of cracking at the bent portion.

Example 1 A copolymerized polyester resin having the composition shown in Table 1 below was produced, and its properties were measured.

As is clear from Table 1 above, the copolymerized polyester resin of the polymer composition of the present invention exhibited good properties in terms of Erichsen value, impact value, and flexibility, but only the terephthalic acid component and isophthalic acid component of Comparative Example 5 The material (polymer 5) was hard and difficult to bend, and cracked when forced to bend, and had poor impact resistance, causing cracks.

Also, those with too little aromatic dicarboxylic acid (polymer 6
) had poor impact resistance and cracked.

Furthermore, cracks also occurred when bent.

Next, roofing materials were manufactured using these copolymerized polyester resins in the following manner.

That is, after applying an epoxy adhesive to one side of a flat galvanized iron plate and adhering an asbestos sheet, the above-mentioned copolyester resin mixed with titanium oxide and blue pigment was hot-melt coated to a thickness of 1 mm. ,
The whole was molded into a corrugated shape using a press.

Those using resins of Polymers 1 to 4 did not generate cracks when bent into a wave shape, and did not cause delamination between the layers.

This roofing material was also subjected to a weather resistance test in which UV irradiation and water sprinkling were repeated every hour, but no abnormality occurred on the resin surface after 30 days, and the iron plate did not rust at all.

Furthermore, this roofing material was stored in a freezing room at -15℃ for two days and nights.
A 5 kg weight was dropped onto this from a height of 1 m to examine its impact resistance, but no cracks were found.

On the other hand, the roofing materials using Polymers 5 and 6 developed fine cracks when bent into a wave shape, and it was clear that they could not be used as roofing materials.

Furthermore, the resin layer is coated with an acrylic resin emulsion to a thickness of 1 m.
Although it could be used for a while without cracking or peeling even when formed into a corrugated shape, it had poor water resistance, and after 30 days in the above weather resistance test, the steel plate failed. There was obvious rust on the surface.

Note that roofing materials in which a polymethyl methacrylate film was further laminated on the resin layer of the roofing material using Polymers 1 to 4 described above showed even more excellent weather resistance.

[Brief explanation of drawings]

FIG. 1 is an example of a cross-sectional view of the roofing material of the present invention. DESCRIPTION OF SYMBOLS 1... Metal plate, 2... Adhesive layer, 3... Fiber sheet-like heat insulating material, 4... Copolymerized polyester resin layer, 5...
...Film layer.

Claims (1)

[Claims] 1. In a roofing material in which a metal plate, a fiber sheet-like heat insulating material, and a resin layer are laminated in this order, the resin layer contains 40 to 80 mol% of an aromatic dicarboxylic acid component as a dicarboxylic acid component (
Of the aromatic dicarboxylic acid components, the terephthalic acid component is 40%
molar coefficient or higher) and 60 to 20 mol% of an aliphatic dicarboxylic acid component having 6 to 40 carbon atoms, and using a copolymerized polyester resin consisting of glycol having 2 to 8 carbon atoms as the glycol component. roofing material.