JP2610154B2 - Manufacturing method of mixed reinforcing material for structural material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mixed reinforcing material for a structural material which is embedded in a structural material having a low tensile strength such as concrete and plastic to increase the tensile strength of the structural material. And a method for producing the same.

(Prior Art) According to Japanese Patent Application Laid-Open No. 64-29560, the applicant of the present invention bundles a plurality of short fibers having high tensile strength into a rod-shaped body and binds the short fibers to each other with a binder. In addition, the present invention provides a mixed reinforcing material for a structural material, in which a granular material is adhered on the surface of the rod-shaped body to firmly adhere to the structural material.

(Problems to be Solved by the Invention) An object of the present invention is to provide a simple and efficient method for producing the mixed reinforcing material for structural materials.

(Means for Solving the Problems) In the present invention, an uncured binder is impregnated into a thin bundle obtained by bundling a plurality of long fibers having high tensile strength, and then the binder is cured to form an elongated cured bundle. Then, the cured bundle is cut to the length of the mixed fiber for structural material to obtain a rod-shaped body, and then the granular material is adhered and fixed to the surface of the rod-shaped body with an adhesive, thereby achieving the above object. To achieve.

(Function) A cured bundle obtained by impregnating a binder into a bundle of long fibers having a large tensile strength and binding each long fiber to each other was easily cut and obtained before attaching particulate matter to the surface. Granules adhere to the surface of the rod.

(Example) Hereinafter, an example of the manufacturing method of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a process of forming a cured bundle, for example, a 1420 denier Kevlar as a bundle (2) of long fibers (1) made of aromatic polyamide fiber and having high tensile strength.
49 strands are wound around a bobbin (3), and the bundle (2) is passed through a binder impregnation tank (4) to impregnate the uncured binder in the tank (4). And then
The bundle (2) is passed through a heating furnace (5) to cure the binder to form a cured bundle (6), and the obtained cured bundle (6) is wound onto a winding bobbin (7). ). In the drawings, (8) and (8 ') indicate tension guides, and a tension of about 0.7 to 5 kg is applied to the bundle (2). In the drawing, (9) indicates a guide roller for the bundle (2).

FIG. 2 shows a cutting step of the cured bundle (6).
It is suitable for intermittently sending out the cured bundle (6) wound around the winding bobbin (7) obtained in the previous step and mixing it into the structural material by a cutter (10) comprising a cutter. It is cut into about 30 mm to obtain a rod-shaped body (11). In the drawing, (12) indicates a guide roller for the cured bundle (6).

In the illustrated embodiment, the cured bundle (6) is cut by the cutting material (10) made of a cutter, but may be cut by a water jet method or a plasma method.

FIG. 3 shows a step of attaching the granular material. The rod-like body (11) obtained in the previous step is stacked on a net conveyor (14) via a hopper (13), and the net conveyor (14) Is passed through an adhesive immersion tank (15) to adhere the uncured adhesive (16) in the tank (15) to the surface of the rod-shaped body (11). Adhesive (1 on the surface of the body (11)
After air-drying 6), the rod-shaped body (1) is vibrated to the belt conveyor (14) by a vibration generator (17).
1) Through the hopper (18), for example, particulate matter (19) such as sand
And then a bar (11) with granular material (19) attached
Is passed through a hot air drying oven (20) to harden the adhesive (16) to completely adhere the particulate matter (19) to the rod (11),
The reinforcing material for structural material shown in FIG. 4 is obtained. In the drawing, (21) indicates a guide conveyor.

In place of the step of attaching the particulate matter (19) of the above-described embodiment, in the step of cutting the cured bundle (6) of the above-described embodiment, the hardened bundle is cut and, at the same time, a binder is attached to the obtained rod-like body (11) You may make it spray a granular material.

In the illustrated example, one strand is used as the bundle (2) in which a plurality of long fibers (1) having high tensile strengths are bundled. However, even if the plurality of strands are aligned in parallel, Alternatively, a plurality of strands may be knitted into a braid. In the case of the braided shape, as shown in FIG. 5, the unevenness of the surface of the rod-shaped body (11) itself and the unevenness of the granular material (19) are combined, so that the adhesion to the structural material is extremely excellent.

The long fiber (1) having a large tensile strength is not limited to the above-mentioned aromatic polyamide fiber, but may be polyester fiber, high-strength polyolefin fiber, high-strength polyamide fiber, or the like.
Organic fibers such as high-strength polyvinyl alcohol fibers, inorganic fibers such as carbon fibers, glass fibers and ceramic fibers, and metal fibers such as steel fibers can be used alone or in combination.

Examples of the binder and the adhesive (16) include room temperature or thermosetting resins such as epoxy, polyester, vinyl ester, phenol, and polyimide, alkali metal silicate, colloidal silica, and phosphate. system,
A room temperature or heat-curable inorganic material such as a cement system, a room temperature or heat-curable organic / inorganic composite material, or the like can be used.

In addition, as the granular material (19), silica sand, metal particles, ceramic particles, plastic particles, or the like having a particle size of about 0.05 mm to 0.5 mm can be used.

The diameter and length of the obtained rod-shaped body (19) are arbitrary according to the required tensile strength, but the diameter is 0.2 mm to 2.0 m.
In general, the length is about 5 mm to 50 mm.

(Effect of the Invention) As described above, according to the method for producing a mixed reinforcing material for a structural material of the present invention, a hardened bundle obtained by impregnating a binder into a bundle of long fibers having a large tensile strength, and a granular material on the surface are formed. Since it is cut before being attached, the cutting is easy, the workability is excellent, and the mixed reinforcing material for structural materials that can sufficiently increase the tensile strength and toughness performance of the structural material can be efficiently manufactured. Having.

[Brief description of the drawings]

1 to 3 are explanatory diagrams of each step of an embodiment of the manufacturing method of the present invention, FIG. 4 is a perspective view of a mixed reinforcing material for a structural material obtained by the manufacturing method, and FIG. FIG. 9 is a perspective view of a mixed reinforcing material for a structural material obtained by another embodiment. DESCRIPTION OF SYMBOLS 1 ... Long fiber, 2 ... Bundle 4 ... Binder impregnation tank, 5 ... Heating furnace 6 ... Cured bundle, 10 ... Cutting machine 11 ... Bar-shaped body, 15 ... Adhesive immersion tank 16 …… Adhesive, 19 …… Particles 20 …… Hot air drying oven

Claims (1)

(57) [Claims] An uncured binder is impregnated into a thin bundle obtained by bundling a plurality of long fibers having high tensile strength, and then the binder is cured to form an elongated cured bundle. A method for producing a mixed reinforcing material for a structural material, comprising cutting a body into lengths of mixed fibers for a structural material to obtain a rod-shaped body, and then attaching and fixing a granular material to the surface of the rod-shaped body with an adhesive.