JPS585932B2 - Kairyosare Tapa Light Tounori Yushitai Oyobi Conopalite Tounori Yushitai Omochiitaika Tainetseigou Seijyushitai - Google Patents

Description

Detailed Description of the Invention The present invention implements a new treatment on inorganic porous grains such as pearlite grains, which have several characteristic physical properties as a refractory material, and improves the various physical properties of pearlite grains as a lightweight refractory material and aggregate. The present invention relates to a novel fire-resistant and heat-resistant synthetic resin foam in which so-called improved pearlite particles are mixed and dispersed.

As is well known, pearlite is a granular porous material made by firing kokuryokushi, perlite, and other volcanic rocks at high temperatures. It is also widely used as a lightweight aggregate for construction materials, etc.

In particular, in recent years, attempts have been made to improve the resin economy and the fire resistance and heat resistance of synthetic resin structures by filling or mixing pearlite particles into various synthetic resin foam structures. Many have been proposed.

There have been many proposals for flame-retardant and heat-resistant synthetic resin materials that are made by mixing pearlite powder and other refractory minerals with this type of foamable synthetic resin base material, and some of them have already been put into practical use. Not a few.

However, as mentioned earlier, pearlite grains themselves are lightweight cellular structures formed by firing and foaming, and as a practical matter, it is extremely difficult to uniformly mix them into the desired synthetic resin base material. The more viscous the resin base material, the more difficult it is to mix it homogeneously in its structure at a considerable mixing ratio.

In addition, if the desired synthetic resin is, for example, a foamable polyurethane resin and you try to mix and fill it with a considerable amount of pearlite particles, as mentioned above, it is difficult to mix the pearlite and resin as uniformly as you want. I can't go there.

The inhibition of urethane foaming when pearlite grains are present is as follows:
Porous pearlite grains are present within the viscous structure of the resin and maintain a fairly high degree of porosity, which pre-prepares low-pressure cavities within the unfoamed resin structure.
This allows internal diffusion of CO2 gas, air, etc. during resin foaming, and as a result, gases that should originally participate in resin foaming are dissipated into the interior, inhibiting the promotion of uniform structure formation of resin foaming, and preventing the formation of a foamed structure. This resulted in a decrease in mechanical strength.

Moreover, this tendency tended to increase as the amount of pearlite grains added increased.

Furthermore, when a synthetic resin foam is exposed to high temperatures, even if a certain percentage of non-combustible substances are mixed on average in the flammable organic substance structure, when viewed as a whole, the said substances are not necessarily present. However, it cannot be said that it is non-flammable.

After the flammable components are burned off at high temperatures,
Only non-combustible mixtures such as gypsum powder and perlite grains were left behind, and only an initial effect on heat resistance could be expected.

In other words, in panels and the like, only pearlite grains, etc. accumulated downward, and the burnt-off synthetic resin part became a space, and the fire resistance and heat resistance performance could not be expected at all.

Furthermore, when the synthetic resin is combusted, it emits a lot of smoke and also generates some unsophisticated gas.

In addition, conventionally, for example, within the structure of foamed polyurethane resin,
When normal pearlite particles are mixed, adjacent pearlite particles are pushed away and dispersed during the foaming process of the resin. In this case, only the thermal decomposition of the heat-sensitive resin composition becomes noticeable, and the resin component burns out before the heat-resistant temperature range of the pearlite mixture is reached.

In other words, because it is lightweight and bulky, uniform distribution is very difficult, and non-uniform distribution has the disadvantage that the weakest point in fire resistance and heat resistance becomes a foamed structure.

Furthermore, when a large amount of a material such as borax, which releases crystal water under high temperatures, expands, and forms an inorganic foam layer, is mixed into a material that has a dehydrating effect, such as polyurethane resin, the surface area becomes large, and this type of material The reaction ratio between the resin components changes, forming a rough foam structure.

Furthermore, since borax etc. are dehydrated, in the event of a fire, it cannot be expected that the desired inorganic foam layer will be formed and the synthetic resin foam will be reliably protected by bridging between the powders.

In addition, in terms of weather resistance, if a powder with a large surface area is distributed as it is in a synthetic resin foam, this type of member has the disadvantage that it will directly change its physical properties in terms of weather resistance.

In order to eliminate such drawbacks, the present invention utilizes a refractory material such as pearlite particles, and gradually foams and expands while releasing crystal water at high temperatures to produce a fire-resistant and heat-resistant inorganic foam layer. A fire-resistant and heat-resistant synthetic resin foam that protects a combustible synthetic resin foam layer by incorporating so-called improved pearlite particles, which are particles impregnated or coated with non-combustible fire-resistant pearlite particles, as a core, with an inorganic substance and protecting a combustible synthetic resin foam layer. I will provide a.

In the present invention, improved particles such as pearlite are particles such as pearlite, vermiculite, or shirasu balloon, which are made by firing pearlite or other volcanic rocks, and some or all of them contain inorganic substances that foam at high temperatures. This is an improved particle of pearlite or the like which is coated or impregnated with a so-called foamable inorganic material which is a mixture of one or two of the above.

The foamable inorganic material used as the coating material may be, for example, borax containing water of crystallization, sodium silicate, dibasic sodium phosphate, or a mixture of one or more of these.

Furthermore, as pearlite and the like used in the present invention, granules having a particle size of about 1 to 5 mm are mainly used.

This is because the porous structure and voids of porous inorganic particles such as pearlite particles are used as the filling part for the foamable inorganic material, and a large amount of the foamable inorganic material can be dispersed in a small surface area in the same way as when simply mixing pearlite grains. .

Further, particles such as pearlite grains act as aggregates, reinforcing materials, and protective materials.

In other words, it functions as the core and aggregate of the inorganic foam layer formed under normal conditions and at high temperatures, and when forming the inorganic foam layer, it is impregnated and coated with a large amount of foamable material even if it is unevenly dispersed. The inorganic foam layer easily bridges between these particles and protects the synthetic resin foam while cooling the surroundings.

Particles such as pearlite also function as a protective material that traps the foamable inorganic substance within the shell to provide weather resistance and prevent damage from external forces.

In the present invention, the synthetic resin foam is one that is made from polyurethane resin, for example, but is not necessarily limited to this, and can be used as a building material, and can also include inorganic materials,
Any material with physical properties that allow mixing may be used.

Next, an example will be explained.

For example, 40 parts by weight of pearlite with an average particle diameter of 3 mm, 20 parts by weight of a mixture of borax and sodium metasilicate melted and liquefied at a ratio of 1:1, coated with pearlite, dried, and 40 parts by weight of a two-component polyurethane resin. Furthermore, 10 parts by weight of borax was mixed with 10 parts by weight, and the mixture was discharged onto an iron plate, and aluminum foil was overlapped to increase the foaming ratio of the polyurethane to approximately 10 to 2.
A 10 mm thick plate was aged in a Cure Open at 50° C. for about 2 minutes to increase the thickness to about 0 times.

When this was heated for 10 minutes using a Punsen burner from the iron plate side, there was almost no smoke, and the foam was covered with an inorganic foam layer with pearlite grains as the core, and no collapse of the foam was observed, confirming sufficient fire resistance.

Synthetic resin foam-molded in this way has an extremely light apparent specific gravity, is large in bulk, has high mechanical strength, and has excellent workability. When used, it exhibits excellent heat insulation and soundproofing effects, and
When an abnormally high temperature occurs, such as a fire, the so-called foaming material components such as borax and sodium silicate mixed in the surface layer near the heat-exposed surface of the resin structure dehydrate and foam, creating a fine-grained and dense structure. A heat insulating inorganic foam layer is generated and used to block thermal effects on the interior of the resin structure.

The mixed foaming materials such as borax and sodium silicate exposed to heat accelerate each other and foam violently, expanding the inorganic foaming composition in such a manner that it penetrates into the resin structure between adjacent pearlite particles. Improves overall fire resistance.

As the temperature increases further, the coating foam material becomes a glass-like viscous composition, binds the pearlite grains mixed in the resin, and forms a so-called pearlite-based refractory structure. This results in a higher degree of heat resistance.

As explained above, the fire-resistant and heat-resistant synthetic resin foam using improved particles such as pearlite according to the present invention utilizes the unique and effective properties of pearlite particles etc. to allow at least a portion of the foam to be exposed to high temperature. The material is impregnated and coated with an inorganic foam material that gradually expands and expands while releasing crystal water to form an inorganic foam layer, thereby modifying the porous structure on the surface and removing the air contained in the pearlite grains. In addition, sufficient fire and heat resistance can be achieved by adding a small amount of inorganic material to a synthetic resin while containing a large amount of inorganic material as described above.

Also, unlike conventional powder-like or porous surface particles, the surface area can be significantly reduced, so that it can be added without disturbing the foamed structure of the synthetic resin, resulting in a significant improvement in resin economy.

Furthermore, since the foam structure of the synthetic resin becomes uniform and the hard aggregate is contained and distributed, there is an advantage that a synthetic resin foam with sufficient mechanical strength can be obtained without impairing the original heat insulation performance and soundproofing performance. .

Furthermore, since the surface of particles such as pearlite particles is improved to show alkalinity as a whole, even when it is mixed with foamed polyurethane resin, for example, the foaming properties of the resin will not be inhibited.

Moreover, when this synthetic resin foam is exposed to high temperatures, inorganic foam materials such as borax and sodium silicate or borax and dibasic sodium phosphate coexist harmoniously. Therefore, the dehydration and foaming phenomenon is extremely accelerated due to the mutual effect of the two, and the insulating refractory layer (the porous structure of inorganic porous grains such as pearlite grains) within the target tissue is effectively utilized, and the inorganic core is It is a revolutionary and ideal method to create a foam layer, and has the characteristic that it can coat combustible synthetic resin foams to greatly improve their fire and heat resistance.

Claims (1)

[Claims] 1. Particles obtained by impregnating or coating part or all of particles such as pearlite particles with one or two types of foamable inorganic substances that gradually expand and expand to form an inorganic foam layer while releasing crystal water at high temperatures. A fire-resistant and heat-resistant synthetic resin foam characterized by having bodies scattered within a synthetic resin foam.