JPH0781330B2 - Insulation - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating material, and particularly to a heat insulating material suitable for a building wall.

[0002]

2. Description of the Related Art Short glass fibers produced by a centrifugal method or the like are coated with a binder such as an uncured phenol resin binder to collect cotton, which is then heated while being pinched to have a predetermined density. A low-density glass short fiber mat in which glass fibers are hardened and bonded together is lightweight, has excellent heat insulation and sound absorption, and is widely used as a heat insulating material. Short glass fiber mats are easy to irritate the skin and prevent irritation.
Also, to prevent short glass fibers from scattering from the mat,
A surface covering material such as a synthetic resin film is provided on the surface of the mat, and the surface covering material is brought into close contact with the surface. In order to improve the sound absorption characteristics of the heat insulating material as described above, and to prevent moisture from being condensed inside, a large number of small holes are formed on the surface of the surface covering material. Further, aluminum is vapor-deposited on the surface of the surface covering material in order to improve the heat insulating property.

[0003]

The prior art has the following problems. It is necessary for the heat insulating material to pass the ignition acceleration test specified in JIS A 9522, but if a film with many small holes is used as the surface material, it should be a film without small holes. In comparison, it is easier to catch fire. Although the cause is not clear, when a small hole is formed in the film, a pointed tip, an irregularly-shaped frayed shape, or the like is caused around the small hole due to the breakage of the film caused by the perforation. It is considered that when this occurs, this part becomes chemically unstable, the air contained in the low-density mat is supplied to this part, and ignition occurs from this part. Ignition can be suppressed by punching the film by punching and preventing the formation of such a portion, but the punching efficiency is lowered, and this method is not industrial. Ignition can be suppressed by using a flame-retardant film such as a vinyl chloride film, but a toxic gas such as hydrogen chloride is likely to be generated during a fire.
Further, although ignition can be suppressed by using a film such as a polyester film, the cost is likely to increase. Although it is possible to prevent ignition by mixing a flame retardant such as a brominated compound into the polyethylene film, mixing a flame retardant not only raises the cost, but also causes environmental pollution in the film manufacturing and aluminum deposition processes. To do. The present invention solves the above-mentioned problems of the prior art, and provides a heat insulating material that passes the above test even when an industrial perforation method of forming a small hole with a needle using an inexpensive polyethylene film is adopted. The purpose is to provide.

[0004]

In the present invention, in order to achieve the above object, phosphorus-based, hindered phenol-based,
Or 0.1-5 wt% of thioether type antioxidant
A heat insulating material is formed by providing a polyethylene film having a small hole formed by a needle on at least one surface of a glass short fiber mat having a density of 8 to 64 Kg / m ³ .

Next, the present invention will be described more specifically.
In the present invention, the glass fiber mat has a diameter of 4 to
12μ, preferably 6 to 8μ glass short fiber, 2 to 10wt% of binder as solid content, desirably 3 to 8wt%
A bulk density of 8 to 64 Kg / m ^3, preferably 10 to 40 Kg / m ³ , obtained by adding,
A thickness of 20 to 150 mm, preferably 30 to 100 mm, is suitable. As the binder, B-stage phenol resin, modified phenol resin, or the like can be preferably used. As the surface material, 0.1 to 5 wt% of the following antioxidants, preferably 0.2 to 2 w are used.
Polyethylene film containing t% has many small holes as needles.
Therefore, the punched one is used. Small hole size is 0.3 ~
It is about 3 mm, and the number thereof is about ^{2 to} 10 per cm ² . Antioxidant ADEKA STAB 329K, PE
P-8, HP-10, PEP-36 (all are trade names,
Asahi Denka Kogyo Co., Ltd., IRGAFOS168 (trade name, manufactured by Ciba-Geigy), phosphorus-based organic compounds, Adeka Stab A0-23, A0-503A (all are trade names,
Asahi Denka Kogyo Co., Ltd.) thioether organic compounds,
Or IRGANOX1010, IRGANOX1035
FF, IRGANOX 1076, IRGANOX 245
(All are trade names, manufactured by Ciba Geigy), Adeka Stab A0-20, A0-30, A0-40, A0-50,
A hindered phenolic organic compound such as A0-60,328 (all are trade names, manufactured by Asahi Denka Co., Ltd.) is used. In particular, a phosphorus-based organic compound has a great effect and is safe even if it is mixed in a food container during the manufacturing process, which is the most desirable. A mixture of a hindered phenol-based organic compound and a thioether-based organic compound also has a great effect following the phosphorus-based compound. Up
It is of course possible to use two or more kinds of the antioxidants together.
It

These antioxidants are added to the resin in order to prevent deterioration of weather resistance and heat resistance of the resin when the thermoplastic resin is extruded by an extruder, kneaded or injection-molded.
The compound is used in an amount of about 05 wt%, but by adding 0.1 to 5 wt%, preferably 0.2 to 2 wt% of these antioxidants to polyethylene, the chemical around the small holes as described above can be obtained. It was found that it is possible to suppress the ignition from a place that is physically unstable (called the ignition point). Although the mechanism is not clear, it is considered that the above-mentioned high-concentration antioxidant oxidizes itself to suppress the ignition of the polyethylene film at the ignition point. If the amount of the antioxidant is less than the above range, the action is not sufficient, and if the amount is more than the above range, not only the physical properties of the film are deteriorated but also the cost is increased.

There is no particular limitation on the method for providing the surface covering material on the surface of the short glass fiber pine, and the surface covering material may be adhered to one or both surfaces of the mat, or a surface provided on both surfaces. The covering material may be projected from the peripheral surface of the mat, and the front covering materials may be adhered to each other to form the ears, or alternatively, the front covering material may cover one surface and both side surfaces of the mat to cover the front covering material. It is also possible to form a heat insulating material by folding back so as to cover a part of the pine, and by adhering, for example, asphalt kraft paper to the exposed surface of the pine and the folded surface covering material. The heat insulating material of the present invention is particularly suitable for a wall of a building, but can also be used as a heat insulating material for a ceiling.

[0008]

[Function] Phosphorus, hindered phenol, or thioe
The surface covering material made of polyethylene film containing 0.1 to 5 wt% of an ether type antioxidant has a density of 8 to 64 kg /
By providing an inexpensive polyethylene film by providing it on at least one surface of the m ³ short glass fiber mat, the ignition is suppressed even when a large number of small holes are formed in this film by an industrial method.

[0009]

[Example] 3 kg by weight of a phenol resin binder as a solid content was added to a glass short fiber having an average diameter of 7 μ, and 10 kg
A glass short fiber mat having a thickness of / m ³ and a thickness of 50 mm was produced. ADEKA STAB 329K (trade name, manufactured by Asahi Denka Kogyo Co., Ltd.)
Is a surface coating of aluminum with a thickness of 400 Å and 5 0.8 mm small holes per 1 cm ^{2 on} the surface of a 10 μm thick polyethylene film containing 0.5% by weight. , The entire surface of one side (front surface) of the glass short fiber mat, the side surface and a part of the other surface (back surface) are covered, and the exposed part and the back surface which are not covered with the film on the back surface of the mat are covered and used as the front material. The asphalt kraft paper was adhered to produce a heat insulating material. This mat is JIS A 9522
It passed the ignition acceleration test of No. 1 and did not cause environmental pollution in the film production and vacuum evaporation processes.

[0010]

According to the present invention short glass fiber Ma Tsu door the JIS A 95
When tested by the method of No. 22, it prevents ignition from occurring around the small holes formed in the surface material. Further, no environmental pollution occurs in the manufacturing process, and the increase in cost is slight. No toxic gas is emitted during a fire. Sound absorption
It also has good properties and does not cause internal dew condensation.

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Claims (1)

[Claims] 1. A phosphorus-based, hindered phenol-based, or
0.1-5 wt% thioether type antioxidant
And a polyethylene film having small holes formed by needles provided on at least one surface of a glass short fiber mat having a density of 8 to 64 kg / m ³ .