JPS5832172B2 - Mukikago Butsugan Yujiyushiyuseidantsuzaino Seizouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fireproof material made of synthetic resin containing an inorganic compound and effective as a lightweight material having properties such as nonflammability and fire resistance.

Its purpose is to respond to external high temperatures by self-interaction,
It is an object of the present invention to provide a method for producing a lightweight, non-combustible building material that forms a fire-resistant layer.

Much research has already been done into making foamed molded bodies that are made of silicates as a main component and synthetic resins added thereto as a conventional heat insulating material.

That is, silicates themselves are extremely fragile and have poor fire resistance, so they are not versatile.

Furthermore, by mixing these silicates and resins, lightweight building materials that are solidified by the combination of the silicates and the resins are also produced.

However, although it is true that such resin mixtures are extremely superior in various physical properties compared to silicate alone, the current situation is that it is still not possible to obtain sufficient heat resistance and fire resistance.

In order to solve these defects, in the present invention, using hydrated boric acid, calcium carbonate, and calcium hydroxide,
By forming a heat insulating layer of glass-like calcium salt and making it exist in the resin, the synthetic resin has fire resistance,
Due to the nonflammability and strong bonding effect between the compositions, the resin and its inorganic substances have been able to exhibit unique effects that cannot be seen alone.

The gist of this method is to add hydrated boric acid, calcium carbonate, and calcium hydroxide granules and powders to a synthetic resin, knead them, and then form the kneaded mixture into an unfired shape. .

The present invention will be explained in detail below.

As the hydrous boric acid according to the present invention, H2S2O8.10H
10 of 20 containing water of crystallization and H2S2O8.5
It refers to a compound containing 5 water of crystallization of H2°.

The synthetic resin includes both thermoplastic synthetic resins and thermosetting resins, and the former includes vinyl acetate resin, acrylic resin, polyvinyl alcohol resin, styrene resin, polyethylene, polypropylene, polyamide, and the like.

The latter includes melamine resin, urea resin, phenol resin, epoxy resin, silicone resin, polyurethane resin, and the like.

As described above, the present invention requires phase line mixing of hydrous boric acid, calcium carbonate, calcium hydroxide, and synthetic resin.

The reaction mechanism is that when the inorganic compound is blended into a synthetic resin, it exists in a stable mixture state or
When heated to ~450°C, it dissociates as shown below and exhibits a heat-resistant effect.

As shown in the above reaction formula, by heating to a high temperature, the water of crystallization in the hydrous boric acid is separated and evaporated, and together with the carbon dioxide gas produced at the same time, the foaming effect is promoted.

The basic calcium borate produced by the reaction is a needle-like crystalline substance that forms a fire-resistant heat insulating layer.

That is, when the mixed green body according to the present invention is used, for example, as a building material, and once heat is applied from the outside, a crystalline layer of calcium borate salt is formed in the resin, which cannot be seen at all in the resin alone. It is used to make heat-resistant resin.

In this way, the present invention provides that a mixture produced from an inorganic compound, particularly a composition of calcium carbonate, calcium hydroxide, and a synthetic resin, is a lightweight material that is nonflammable, has excellent heat resistance, and has heat retention properties. In particular, it can be provided at low cost as a coating material or lining material.

The production of the lightweight refractory material of the present invention will be described below with reference to Examples.

Example 1 Calcium carbonate 30 parts by weight Calcium hydroxide 30 parts by weight Hydrous boric acid
60 parts by weight acrylic resin 1
Calcium carbonate, calcium hydroxide, and hydrated boric acid powder granules are uniformly mixed in a mixer at a ratio of 20 parts by weight or more, and the acrylic resin is completely mixed with this mixture.
Dry and cure at a temperature of 0°C.

The molded plate thus obtained is extremely light, with a bulk specific gravity of 0.75, and forms a crystalline heat insulating layer against external high temperatures, that is, high temperatures of 700°C or higher, and can withstand high temperatures. It can be done.

That is, although it was ignited by the gas flame, it self-extinguished as soon as the gas flame was moved away.

Example 2 Calcium carbonate 30 parts by weight Calcium hydroxide 30 parts by weight Hydrous boric acid
30 parts by weight polyurethane resin
A polyurethane resin is mixed into a mixture of calcium carbonate, calcium hydroxide, and hydrated boric acid uniformly mixed in a mixer in a ratio of 90 parts by weight or more, and the mixture is completely homogenized.

Next, the mixture was molded into a plate shape at 120°C to obtain a lightweight molded product with a bulk specific gravity of 0.79.

Furthermore, the same effects as in Example 1 were obtained regarding flame resistance.

If the synthetic resin of the molded plate manufactured as described above is thermoplastic, it exhibits completely non-flammable properties, while in the case of thermosetting resin, it becomes non-flammable only when heat is applied from the outside. It shows.

That is, when heat is applied from the outside, this molded body forms a strong heat insulating layer as described above due to mutual chemical reactions in the mixture.

In any case, it is ideal as a noncombustible building material, and it has properties not found in conventional noncombustible building materials, namely, it is extremely lightweight and has excellent fire resistance, heat retention, and insulation properties, so it is expected to have a wide range of applications as a noncombustible material for building materials. It is possible to do so.

Claims (1)

[Claims] 1. Production of an inorganic compound-containing resin heat insulating material, which is characterized by blending and kneading hydrated boric acid and powdered compounds of calcium carbonate and calcium hydroxide with a synthetic resin, and forming the kneaded mixture into an unfired shape. Law.