JP2919904B2 - Fire resistant plastic material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fire-resistant plastic material in which the fire resistance of a plastic foam is greatly enhanced.

[Conventional technology]

In general, it is known that plastic foam burns at about 100 ° C., melts at about 80 ° C., or carbonizes like phenol foam. In order to improve the fire resistance of plastics, foams to which pearlite grains, shirasu balloon, borax, sodium silicate, etc. are added are disclosed in JP-A-48-56716, JP-B-37-13334, and JP-B-63-16422. It is described in the gazette.

[Problems to be solved by the invention]

However, in the above, a composition obtained by simply adding an inorganic material, is a foam obtained by adding pearlite particles to a foam, and these known flame-retardant resin compositions have a flame retardancy of 3 in a test in JIS-A-1321. It had only fire protection of a class or semi-combustible material. When the flame retardancy is further increased, the plastic material is used as much as a welding agent, and it is hard to say that it is a plastic material or a plastic foam material. Of course, there is also a disadvantage that the resin is burned or carbonized by heating, and the inorganic powder falls off and cannot be maintained as a molded body.

[Means for solving the problem]

The present invention, in order to eliminate such defects, to mix the inorganic powder foaming under high heat in a plastic foam and bridging between the powder, and a glassy adhesive, a frit that forms an inorganic thin layer, It proposes a plastic material that can withstand high temperatures of about 1000 ° C.

〔Example〕

Hereinafter, the fire-resistant plastic material according to the present invention will be described in detail with reference to the drawings. That is, FIG. 1 is a perspective view showing an example of the refractory plastic material A, wherein 1 is a plastic foam, 2 is a frit, 3 is an expandable inorganic powder, and a frit 2 and an expandable inorganic powder 3 are formed in a plastic foam 1. It is a form that mixes the amount according to the purpose. To further explain, the plastic foam 1 may be either thermoplastic or thermosetting. For example, the former is a polystyrene resin, a vinyl chloride resin, and the latter is a polyurethane resin, a resin for polyisocyanurate foam, a phenol resin, a urea resin, It is made of one type of polyester resin and the like, and is made into a foam by using a foaming agent such as water, freon, carbon dioxide gas or the like for these resins. The frit 2 is made of a lead frit, a borate frit, a lead borate frit, or the like. As an example, a composition comprising lead circle, quartz, borax, limestone, kaolin, a composition comprising lead circle, quartz, boric acid, soda ash, saltpeter, quartz, limestone, a composition comprising kaolin, feldspar, A composition composed of limestone, barium carbonate, quartz, and zinc white; a lead circle, a composition composed of soda ash, feldspar, limestone, zinc white, kaolin, boric acid, zirconia, and fluorite. Of course, various known compositions can be used for the frit 2. The frit 2 has a size of about 20 to 250 mesh at 50 to 500 parts by weight with respect to 100 parts by weight of the plastic foam 1. The expandable inorganic powder 3 is made of one or more kinds of substances that expand under high heat, for example, powders such as shirasu and vermiculite. The powder 3 mainly foams under high heat and functions as a heat insulating material and a filler. The amount contained in the plastic foam 1 is about 50 to 300 parts by weight based on 100 parts by weight of the plastic foam 1. Yes, its size is about 20-1
It is about 50 mesh. When the refractory plastic material A formed as described above is exposed to a flame directly below 1000 ° C. as shown in FIG. 2, the frit 2 and the foamable inorganic powder 3 are bridged as shown in an enlarged manner, and The refractory and heat insulating layer 4 was formed.

 Next, examples will be described.

Example 1 100 parts by weight of a polyurethane foam raw material as plastic foam 1 and the above-mentioned component 5 as frit 2
0 parts by weight and 200 parts by weight of shirasu as the expandable inorganic powder 3 were prepared, added to the foam raw material, mixed, reacted and foamed to produce a refractory plastic material A having a density of 50 kg / m ³ and a plate thickness of 20 mm.

Example 2 100 parts by weight of a polyisocyanurate foam were prepared as a plastic foam 1 and the above-mentioned components were used as a frit 2 and 200 parts by weight of shirasu were prepared as an expandable inorganic powder 3 to produce the same fire-resistant plastic material A as in Example 1. did.

Example 3 100 parts by weight of a phenol foam raw material as a plastic foam 1 and 5 parts of the above-mentioned components as a frit 2
0 parts by weight and 200 parts by weight of shirasu were prepared as the expandable inorganic powder 3, and a fire-resistant plastic material A was produced in the same manner as in Example 1.

In Examples 4, 5, and 6, the types of the frit 2 and the expandable inorganic powder 3 were changed. In addition, as a test method of fire resistance, flammability test of JIS-A-1321 (1.
Class) and JIS-A-1304 fire resistance test. The results are collectively described in Examples 1 to 6. Further, as a comparative example, a foam obtained by adding 100 parts by weight of pearlite particles and 100 parts by weight of aluminum oxide to 100 parts by weight of a polyisocyanurate foam.

Although the semi-flammable test passed, the bridging between the frit 2 and the expandable inorganic powder 3 was partially achieved by the septum.
The plastic foam 1 itself burned, and only the foamable inorganic powder 3 and the frit 2 peeled off. (C) Due to the high temperature, the frit 2 and the foamable inorganic powder 3 were bridged and separated, and were bridged by a film-like glassy thin film. Niparite grains and aluminum oxide were not bridged, and were in a state of falling individually.

What has been described above is only one embodiment of the fire-resistant plastic material according to the present invention. As shown in FIGS. The surface materials 5 and 6 may be integrally formed, and the surface materials 5 and 6 may be colored steel plates, stainless steel plates, aluminum plates, sheet materials,
It is a composite board made of kraft paper or plastic film with a sandwich structure or canapé structure.

〔The invention's effect〕

As described above, according to the fire-resistant plastic material according to the present invention, the specific gravity is larger than that of a mere foam or a flame-retardant foam, but fire resistance and fire resistance are surely enhanced. Withstands over 1000 ° C heating. Has heat insulation and sound insulation. It is easy to manufacture and can be arbitrarily formed.
There are features and effects such as.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a fire-resistant plastic material according to the present invention, FIG. 2 is an explanatory view showing a fire resistance test method, and FIGS. 3 (a) and 3 (b) are explanatory views showing other embodiments. It is. 1 ... Plastic foam, 2 ... Frit, 3 ...
Foamable inorganic powder.

Claims (1)

(57) [Claims] 1. A refractory plastic material comprising a mixture of a frit and an expandable inorganic powder in a plastic foam.