JPS5832174B2 - Taika Tainetseijiyuushisosebutsu - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fire-resistant and heat-resistant resin composition that is excellent in fire resistance and heat resistance, has a large expansion coefficient, and has extremely high weather resistance.

In the past, in order to make resin flame retardant, alkali silicates or alkali borates, commonly called water glass, were blended into synthetic resins to create fire-resistant, heat-resistant, lightweight weight materials. .

However, the above-mentioned alkali silicates etc.
It has a fire resistance of about 1000℃ and also has a fairly good foaming expansion rate. For example, when it is blended with room temperature curable synthetic resin, it foams and expands sufficiently when heated, penetrating between the synthetic resin compositions and coating the synthetic resin. It plays the role of protecting the material and preventing it from emitting smoke and burning, and as mentioned above, its fire resistance is approximately 800 to 1000 degrees Celsius, so it has a protective power of about 1200 degrees Celsius in the event of an actual fire. It is recognized that the temperature rises to about ℃.

In addition, the foaming materials mixed in these materials contain alkali metals such as alkali silicates and alkali borates, so there are concerns about weather resistance, and there is a risk that the usage conditions will be limited, making them unsuitable for practical use. It is often done.

The present invention has been researched and developed to improve the drawbacks of such conventional products.

The present invention proposes a fire-resistant and heat-resistant resin composition characterized by blending a boron compound or boron hydrate, an ammonium phosphate salt, a gel-like substance, etc. into a synthetic resin.

The boron oxide, boron hydrate, or ammonium phosphate salt used in the present invention does not foam when heated alone, but it foams vigorously when mixed in a certain proportion, and has a fire resistance temperature of 1500°C. It was observed that the increase in

The reason why one of the compositions mixed into the resin body according to the present invention is particularly excellent in fire resistance is that ammonium phosphate converts into polyphosphoric acid and metaphosphoric acid, and further into polymetaphosphoric acid, resulting in the infinite chain structure of this metaphosphate. This seems to be due to the fact that the structure is difficult to destroy.

Further, the practical mixing ratio of boron oxide and ammonium phosphate is in the range of 3:2 to 8:2, preferably 4:2.
The ratio is in the range of 6 to 5:5.

A mixture of such proportions will foam when heated by a flame.

Furthermore, when we investigated the foaming properties and foaming expansion rate when water was added at a weight ratio of 1/1° in the above blending ratio, the ratio of boron oxide and ammonium phosphate was 2:8 to 8:
Foaming was observed only in the range of 2, but even within this range, maximum foaming was observed in the range of 4:6 to 5:5.

Here, the presence or absence of the foaming property is determined by what can be seen with the naked eye.

Furthermore, regarding the above blending ratio, we investigated the fire resistance temperature of the foam and found that it has a fire resistance of 1,200 to 1,300 degrees Celsius, and in particular, at a ratio of 2:8 to 3 near, the foam does not melt even when heated to 1,500 degrees Celsius or higher. It was not possible to investigate higher temperatures due to equipment limitations.

In addition, boric acid H3BO3 and ammonium phosphate were used as boron hydrate, and the blending ratio of ammonium borate diphosphate was O.
When the ratio of ammonium borate diphosphate was in the range of 2:8 to 8:2, it was found that foaming was achieved when the ratio of ammonium borate diphosphate was in the range of 2:8 to 8:2. was recognized.

When the expansion ratio was compared, even within the above range, the expansion ratio was maximum in the range of 4:6 to 5:5.

When we compared the case where water was added in the same way as above, foaming was observed only in the range of 2:8 to 8:2.
Moreover, foaming was maximum in the range of 4:6 to 5:5.

In addition, as a result of testing regarding fire resistance temperature, it was found that the material had a high fire resistance comparable to that mentioned above.

As described above, the mixture added to the fire-resistant and heat-resistant synthetic resin composition of the present invention foams when heated by blending boron oxide or boron hydrate and ammonium phosphate in the ratio, and the foaming expansion also occurs. Moreover, the foam itself has extremely high fire resistance.

Further, in the present invention, one or more of gel-like substances, inorganic hollow particles, granulated refractory materials, and other inorganic materials are added to this mixture.

In addition, boron oxide or boron hydrate used in the present invention includes boron oxide, boric acid, and metaboric acid, and ammonium phosphate salts include ammonium dihydrogen phosphate,
Ammonium phosphate *Metaphosphoric acid such as ammonium triphosphate is also included.

In addition, as mentioned above, there was no particular difference in the presence or absence of water during mixing, but when boron hydrate is used, water is released during the heating reaction, so its use should be avoided. You can refrain from doing so.

Next, the gel-like substance has a water content of about 90% or more, and is essential for flame retardancy and self-extinguishing properties.

The amount of this gel-like material to be added is approximately 5 to 50 parts by weight, depending on the expansion ratio of the synthetic resin.

When adding a gel-like material to a resin, for example, a polyurethane resin, the gel-like material may not only be added as is, but may also be formed into particles or small pieces, and the outer layer may be dried to some extent before being mixed.

As this gel-like substance, ■ Sodium alginate and divalent C
Those using either a ion, trivalent AI ion, or divalent Fe ion, @horivinyl alcohol and borax,
○Milk casein and trivalent Ca ions, ■Acid, carboxymethyl cellulose and trivalent AI ions, etc.
The particle size is about 0.1 to 10 mm.

Of course, aluminum hydroxide, gypsum, etc. may be added to this granular material.

A second invention according to the present invention is a fire-resistant and heat-resistant resin composition obtained by mixing the above-described composition with a boric acid metal salt such as borax, sodium metaborate, and/or a mixture thereof. When it is heated, it first melts, then 120~20
It foams at 0°C and is useful for protecting flammable synthetic resins with an inorganic foam layer.

In particular, this type of inorganic material has the physical property of foaming again if water is supplied, so a large inorganic foam layer can be formed by replenishing water with a gel-like material or the like.

Further, the third invention according to the present invention is to add one or more types of inorganic materials, inorganic porous particles, granulated fireproofing materials, etc. to the synthetic resin, which contributes to flame retardancy and acts as an aggregate and filler. It also acts to strengthen the mechanical strength of the body.

Such substances include calcium carbonate, gypsum, alumina, aluminum hydroxide, soda carbonate, perlite grains,
Shirasu balloons, vermiculite, kaolin, and the above-mentioned foamable inorganic materials, etc., and one or more of these can be granulated or impregnated into pearlite particles,
The granules thus formed are coated with a resin or the like.

Next, examples of the present invention will be described.

Example 1 Compounding ratio Polyurethane resin 100 parts by weight Boron oxide 1.7 Ua 7) ■ °° Parts by weight Borax, 1. I=-7,77.

−7,)■ ′. Part by weight: First, polyurethane resin solutions A and B are mixed and then discharged onto a metal plate. At the same time as foaming starts, the composition (■) and the gel-like substance (■) are added. Aluminum foil is then layered on top of the mixture to form an integral part. Form.

This was molded into a plate of a constant thickness while being heated and pressurized.

When this was heated over an open flame at 900° C. for 5 minutes, there was no significant thermal deformation, and even if the fire was ignited, it was self-extinguished by the moisture in the gel-like material, and there was no afterflame.

Example 2 Mixing ratio of pearlite grains (average particle size 3rILrILφ) 15 parts by weight or more was molded into the same plate as in Example 1.

In this case, since the amount of inorganic material was increased, there were less thermal changes and less ignition than in Example 1.

Example 3 Blending ratio: 30 parts by weight of borax,
After mixing polyurethane resins A and B, this is mixed with borax and pearlite grains, and the mixture is discharged onto a metal plate.

On top of that, boron oxide etc. (1) and gel-like material (2) were spread in pieces, and aluminum foil was layered on top of that to form a plate.

When this plate was exposed to a direct flame at 1200° C. for 10 minutes, the resin was protected by a highly fire-resistant inorganic foam layer made of boron oxide, etc., and no internal destruction was found.

As described above, the fire-resistant and heat-resistant resin composition according to the present invention can withstand high temperatures.

Moreover, its application range is wide, and it exhibits superior effects as a fireproof composition compared to conventional compositions.

Claims (1)

[Claims] 1. A mixture of ammonium phosphate salt added to one of boron compounds or boron hydrates, with or without addition of water, and a gel-like substance mixed into a synthetic resin. Fire-resistant, heat-resistant resin composition. 2. A fire-resistant and heat-resistant resin composition comprising an inorganic foaming material according to claim 1. 3. A fire-resistant and heat-resistant resin composition according to claims 1 and 2, which comprises at least one of inorganic porous particles, a granulated fire-resistant material, and an inorganic material.