JP2566858B2 - Method for producing inorganic civil engineering building structural material and molding material used therefor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an inorganic civil engineering and construction material and a molding material used therefor.

[0002]

2. Description of the Related Art There are known methods for mixing inorganic particles and a liquid epoxy resin composition, molding the mixture, and curing the mixture in order to obtain an inorganic civil construction material. However, in the case of this method, since the epoxy resin composition used as the binder is a viscous liquid, there is a problem that the mixing workability is poor, and the mixing step and the molding step must be performed in the same place. There was an inconvenience.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above problems found in the prior art, is excellent in workability, and has a step of mixing inorganic particles and an epoxy resin composition, and a step of molding the mixture. It is an object of the present invention to provide a method for producing an inorganic civil construction material and a molding material used therefor, which can be carried out in different places.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention. That is, according to the present invention, the average particle size is 0.1 to 7
a step of adhering a fine powder of an epoxy resin composition having an average particle size of 50 μm or less on the surface of the inorganic particles of mm, and a step of molding the inorganic molding material obtained in this step into a required shape
There is provided a method for producing an inorganic civil engineering building material comprising a step of heating the molded body obtained in this step to cure the epoxy resin composition contained in the molded body. Further, according to the present invention, there is provided a molding material for inorganic civil engineering and construction materials, comprising fine particles of an epoxy resin composition having an average particle size of 50 μm or less attached to the surface of the inorganic particles having an average particle size of 0.1 to 7 mm. It

As the inorganic particles used in the present invention, those having an average particle size of 0.1 to 7 mm are used. When the average particle diameter of the inorganic particles is less than 0.1 mm, the air permeability and water permeability of the structural material are poor, and when it exceeds 7 mm, the bonding area becomes small and the bonding strength of the structural material decreases. The shape is preferably spherical, but is not necessarily spherical and may be a crushed material such as rock. Also, various shapes may be mixed. Examples of such inorganic particles include silica beads, alumina beads, zirconia beads, clay-calcined spheres, shirasu balloon, perlite, leucite, zeolite and the like.

The binder used in the present invention is a fine powder of an epoxy resin composition. In this case, any epoxy resin composition may be used as long as it is solid at room temperature. This contains an epoxy resin and a curing agent, and if necessary, auxiliary components such as a curing accelerator and an inorganic filler. In the present invention, in order to prevent the melt of the epoxy resin composition at the time of heat curing from flowing down from the surface of the inorganic particles due to its gravity, one having a high viscosity during melting, usually a viscosity of the melt at 150 ° C. of 500 poise or more. It is preferable to use one having a poise of 1000 poise or more. In the present invention, this epoxy resin composition needs to be used in the form of fine powder, and its average particle size is 5
It is 0 μm or less, preferably 30 μm or less. If the average particle size of the fine powder of the epoxy resin composition is larger than 50 μm, the adhesive bondability of the fine powder of the epoxy resin composition to the surface of the inorganic particles will be insufficient, and therefore the epoxy resin composition will be affected by external force such as vibration. The fine powder of the product is easily peeled off from the surface of the inorganic particle, and the fine powder of the epoxy resin composition is non-uniformly adhered and bonded to the surface of the inorganic particle. In addition, the structural material obtained from this has a structure in which aggregates of inorganic particles are bonded non-uniformly, and the surface thereof is non-uniformly coated with an epoxy resin composition, and therefore has breathability. And the water permeability becomes insufficient.

In the present invention, first, the inorganic particles and the fine powder of the epoxy resin composition are mixed. This mixture is
It can be performed using various conventionally known mixers. The use ratio of the fine powder of the epoxy resin composition is the inorganic particles 10
2 to 30 parts by weight, preferably 3 to 20 parts by weight relative to 0 parts by weight
The ratio is parts by weight. By this mixing step, the inorganic particles in which the fine powder of the epoxy resin composition is firmly adhered and bonded to the surface are obtained. With this product, even if an external force such as vibration is applied to it, the fine powder of the epoxy resin composition attached to the surface thereof does not easily peel off. Therefore, this product can be circulated in the market as a molding material for inorganic civil engineering and construction materials, and the molding process can be performed at another place.

[0008] Next, the molding material obtained as described above is molded into a desired shape, heated, and made into a civil engineering / construction structural material in which the whole is integrally bonded. The heating temperature is the temperature at which the fine powder of the epoxy resin composition attached to the surface of the inorganic particles melts and cures. The molding can be performed using a mold or a frame. In the case of obtaining a molded product with good dimensional accuracy, it is preferable to use a heat and pressure press for the heat molding.
The heating of the molded body can also be performed in a heating furnace. When molding using a mold, the molding using the mold is performed under heating for a short period of time, the molded body is demolded while the epoxy resin composition is gelled, and this molded body is further heated. Then, the epoxy resin composition can be completely cured. In this case, since the mold can be opened in a short time, the use efficiency of the mold is improved.

[0009]

INDUSTRIAL APPLICABILITY In the present invention, the mixing step of the inorganic particles and the epoxy resin composition is performed under dry conditions, so that the workability can be improved and the resulting mixture can be applied to the surface of the inorganic particles. Since the epoxy resin composition is in the form of fine powder and strongly adhered to it, there is an advantage that it can be distributed and sold as a molding material for inorganic civil engineering and construction materials and molded at another place. The inorganic civil engineering building material of the present invention comprises an aggregate of inorganic particles,
In addition, the particles have a structure in which the contact surface is joined via a cured product of the epoxy resin composition. This material has excellent air permeability and water permeability, and is used as a floor material and a wall material, and is also used as a surface structural material in a paved road.

[0010]

Next, the present invention will be described in more detail with reference to examples. Example 1 As an epoxy resin composition fine powder, the average particle size is about 9μ.
The fine powder of the flame-retardant epoxy resin composition of m was used. Further, as the inorganic particles, a spherical body of viscous fired body (“Cerapearl”, manufactured by Nippon Steel Corporation, average particle diameter of about 2.0 mm) was used. 100 parts by weight of the inorganic particles and 10 parts by weight of fine powder of the epoxy resin composition were put into a powder mixer and mixed and stirred. It was confirmed that the mixture thus obtained was one in which fine powder of the epoxy resin composition was uniformly and strongly adhered to the surface of the inorganic particles. Next, this mixture was used as a molding material, which was 40 mm long and 40 mm wide.
It is filled in a box-shaped mold having a depth of 160 mm and a depth of 40 mm, and a heat press is used on the box-shaped mold.
It was heated and pressed for 60 minutes under the condition of cm ² . The molded body thus obtained has a structure in which the aggregates of the inorganic particles are integrally bonded, and the surface of which the inorganic particles coated with the epoxy resin composition are exposed. It had water permeability, and was effective as a surface structure material on paved roads. Example 2 As a fine powder of a flame-retardant epoxy resin composition, an average particle size of 3
A molded product was obtained in the same manner as in Example 1 except that the one having a thickness of 0 μm was used. The obtained molded product had a structure in which the aggregates of the inorganic particles were integrally bonded, as in Example 1, and the inorganic particles coated uniformly with the epoxy resin composition were exposed on the surface thereof. It was water permeable and was effective as a surface structure material on paved roads. Comparative Example 1 As a fine powder of a flame-retardant epoxy resin composition, an average particle size of 6
A mixture of the both and a molded product were obtained in the same manner as in Example 1 except that the one having a thickness of 0 μm was used. In this case, since the resulting mixture has insufficient adhesive bondability of the fine powder of the epoxy resin composition to the surface of the inorganic particles, when an external force such as vibration is applied, the fine powder of the epoxy resin composition is separated from the surface of the inorganic particles. It was easily peeled off, and had a structure in which fine powder of the epoxy resin composition was non-uniformly adhered and bonded to the surface of the inorganic particles. Further, the molded product obtained from this has a structure in which aggregates of inorganic particles are bonded non-uniformly, and the surface thereof is non-uniformly coated with an epoxy resin composition, and therefore has breathability. And the water permeability is insufficient,
It did not function as a surface structural material on paved roads.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masami Nakamura 4-11-2 Ginza, Chuo-ku, Tokyo Somer Co., Ltd. (72) Inventor Katsuji Kitagawa 4-11-2 Ginza, Chuo-ku, Tokyo Somer Co., Ltd. (56) Reference JP-A-60-207302 (JP, A) JP-B-52-26264 (JP, B2)

Claims (2)

(57) [Claims] 1. A step of adhering a fine powder of an epoxy resin composition having an average particle size of 50 μm or less to the surface of an inorganic particle having an average particle diameter of 0.1 to 7 mm, and the inorganic molding material obtained in this step is formed into a required shape. A method for producing an inorganic civil engineering building material comprising a step of molding and a step of heating the molded body obtained in this step to cure the epoxy resin composition contained in the molded body. 2. A molding material for inorganic civil engineering and construction materials, comprising fine particles of an epoxy resin composition having an average particle size of 50 μm or less adhered to the surface of inorganic particles having an average particle size of 0.1 to 7 mm.