JPH0534235U - Building material board - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a building material board using coal ash / gypsum, and an object thereof is to obtain a building material board that is light in weight and prevents the strength from decreasing. [Composition] Coal ash, gypsum dihydrate, waste paper, and a sizing agent were kneaded to contain air bubbles.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a board for building materials using coal ash and gypsum discharged from a boiler of a coal-fired power plant.

[0002]

[Prior Art]

 Conventionally, there is a board in which water is added to a mixture of coal ash and α-type hemihydrate gypsum and ground waste paper and kneaded, and this is pressure-molded.

[0003]

[Problems to be solved by the device]

 The conventional board described above can easily manufacture a high-strength board in a short time. However, since the board has a high density, the weight per unit volume becomes large, which causes a problem in workability.

[0004]

[Means for Solving the Problems]

 Therefore, in order to eliminate the above-mentioned drawbacks, the present invention is characterized in that the main raw materials are coal ash and gypsum dihydrate, the admixture is waste paper, the admixture is a paste, and these raw materials are kneaded to contain air bubbles. It intends to provide a board for building materials.

[0005]

【Example】

 An embodiment of the present invention will be described with reference to Fig. 1. The main raw material (1) is a raw material (coal ash and α) obtained by autoclaving a mixture of coal ash which is a hardening raw material and gypsum dehydrated gypsum. It is a solidified mixture of hemihydrate gypsum). The waste paper (2), which is an admixture, can be any recyclable material such as newspaper, printed advertisement paper that is considered to be difficult to recycle, or any waste paper that is discarded such as magazines. Soak these in water. The mixture was agitated and crushed with a mixer, and 1 to 10 parts by weight was mixed with 100 parts by weight of the main raw material (1). The sizing agent (3) is prepared by mixing 1 to 3 parts by weight with respect to 100 parts by weight of the above-mentioned main raw material (1), using polyvinyl alcohol, starch, acrylic amide, latex or the like alone or as a mixture. 90 to 140 parts by weight of water is used with respect to 100 parts by weight of the main raw material (1). When water is added to the main raw material (1), the waste paper (2) and the sizing agent (3) and kneaded with a pin mixer, the pin mixer entrains air and generates many fine bubbles in the kneaded product. These bubbles become residual bubbles (4) after curing.

[0006] The fine residual air bubbles make the cured product a multi-foamed body, which is lightweight. While the main raw material (1) is a solidified body of spherical or short fiber coal ash and gypsum, the addition of the crushed waste paper improves the elasticity of the hardened body due to the long fibers. The addition of the sizing agent (3) contributes to the generation of fine bubbles during kneading and the improvement of the adhesive strength between coal ash, gypsum and fibers of the waste paper crushed material. The cured product becomes a multi-foamed product, and the strength seems to be relatively lower than that of a cured product that does not contain bubbles, but the adhesive (3) acts to add new adhesive force to compensate for the strength loss. To do. If the sizing agent (3) is not added and the residual bubbles (4) are not generated, the bulk density increases and the weight becomes heavier than the board containing the residual bubbles (4). Further, it is easily conceivable that the strength is increased as compared with the conventional board in which neither the sizing agent (3) nor the residual bubbles (4) are added.

[0007]

[Effect of the device]

 As a result, it is possible to provide a board having the same strength, a light weight, and excellent workability as compared with a board obtained by kneading a mixture of coal ash and α-type hemihydrate gypsum and crushed waste paper with water. It has a great effect on the effective use of coal ash, which generates 10 million tons per year at thermal power plants, and the improvement of added value.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a building material board of the present invention.

FIG. 2 is a table showing a comparison between bulk strength and bending strength.

[Explanation of symbols]

 1 Main material 2 Waste paper 3 Glue 4 Residual bubbles

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location // (C04B 28/14 18:08 B 2102-4G 18:24 Z 2102-4G 24:24) Z 2102- 4G

Claims (1)

[Scope of utility model registration request] 1. A board for building materials, characterized in that coal ash, gypsum dihydrate, waste paper and a sizing agent are kneaded to contain air bubbles.