JPH05302373A - Heat insulating material - Google Patents

Abstract

PURPOSE:To prevent the occurrence of ignition by a method wherein a surface material formed of a polyethylene film in which an oxidation preventing material is blended is formed on at least one surface of a glass short fiber mat. CONSTITUTION:A number of small holes are formed in a polyethylene film mixed with 0.1-5wt.% an oxidation preventing agent being a sulfur, hindered phenol, or thioether organic compound. A surface covering material of the polyethylene film is adhered on at least one surface of a polyethylene film of a glass short fiber mat having density of 8-64kg/cm<3>. This constitution prevents the occurrence of ignition and prevents the generation of noxious gas during the occurrence of a fire.

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, particularly to a heat insulating material suitable for walls of a building.

[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 pressed to have a predetermined density. A low-density glass short fiber mat obtained by curing and bonding glass fibers to each other 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.
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 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 front 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. However, when a film with a large number of small holes is used as the surface covering 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 portion becomes chemically unstable, the air contained in the low-density mat is supplied to this portion, and ignition occurs from this portion. 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 easily 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 increases 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, a polyethylene film containing 0.1 to 5 wt% of an antioxidant is added to have a density of 8 to 64 kg / m ^3.
The heat insulating material is formed by providing the glass short fiber mat on at least one surface. In a preferred embodiment, phosphorus-based, phosphite-based hindered phenol-based, or thiether-based organic compounds are used alone or in combination as an antioxidant.

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 10 wt% of binder as solid content, preferably 3 to 8 wt%
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, a polyethylene film containing 0.1 to 5% by weight, preferably 0.2 to 2% by weight of an antioxidant and having a large number of small holes formed therein is used. The size of the small holes is about 0.3 to 3 mm, and the number thereof is about ^{2 to} 10 per cm ² . Antioxidants include ADEKA STAB 329K, PEP-8, HP-10,
PEP-36 (trade name, manufactured by Asahi Denka Kogyo Co., Ltd.), I
Phosphorus-based organic compounds such as RGAFOS 168 (trade name, manufactured by Ciba-Geigy), ADEKA STAB A0-23, A
0-503A (all are trade names, manufactured by Asahi Denka Kogyo Co., Ltd.), a thioether organic compound, or IRGANOX1
010, IRGANOX1035FF, IRGANOX
1076, IRGANOX 245 (both are trade names, manufactured by Ciba Geigy), ADEKA STAB A0-20, A0-
30, A0-40, A0-50, A0-60, 328
It is preferable to use a hindered phenolic organic compound such as (all trade names, manufactured by Asahi Denka Kogyo Co., Ltd.). 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 type organic compound and a thioether type organic compound also has a great effect following the phosphorus type.

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.
Although it is used in an amount of about 05 wt%, polyethylene is blended with these antioxidants in an amount of 0.1 to 5 wt%, preferably 0.2 to 2 wt%. It has been 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 suppresses the ignition of the polyethylene film at the ignition point by oxidizing itself. If the amount of the antioxidant is less than the above range, its action is insufficient, 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 the surface covering material provided on both surfaces. The material may be projected from the peripheral surface of the mat and the ears may be formed by bonding the surface materials together, or alternatively, the surface material may be used to cover one side and both sides of the mat. It is also possible to form a heat insulating material by folding back so as to cover even a part of the pine and 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: A surface covering material made of polyethylene film containing 0.1 to 5 wt% of an antioxidant is added to have a density of 8 to 64 kg /
An inexpensive polyethylene film is used by providing it on at least one surface of the m ³ short glass fiber mat, and ignition is suppressed even when a large number of small holes are formed in this film by an industrial method. Further, by using a phosphorus-based, hindered failure-based, or thiether-based organic compound as the antioxidant, the above effect is further enhanced.

[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 having a thickness of 400 Å and 5 0.8 mm small holes per cm ² perforated with a needle on the surface of a 10 μm thick polyethylene film containing 0.5 wt% of , 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 portion and the back surface which are not covered by the film on the back surface of the mat are covered to be the front and back materials. 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]

[Effects of the Invention] Short glass fiber pine is manufactured according to JIS A 952.
Prevents ignition from around the small holes drilled in the surface material when tested by method No. 2. Further, there is no environmental pollution in the manufacturing process, and the increase in cost is slight. No toxic gas is emitted during a fire.

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Claims (2)

[Claims] 1. A heat insulating material comprising a polyethylene film containing 0.1 to 5 wt% of an antioxidant, which is provided on at least one surface of a glass short fiber mat having a density of 8 to 64 kg / m ³ . 2. The heat insulating material according to claim 1, wherein the antioxidant is a phosphorus-based, hindered phenol-based, or thiether-based organic compound.