JP2003063851A - Inorganic formed body and producing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize massive effective use of waste materials of woody cement boards and KIRA (mica) and to provide an inorganic formed body being lightweight, having sufficient strength. SOLUTION: An inorganic formed body comprising a cured product of a raw material mixture which consists mainly of cement-based inorganic materials, crushed wastes of woody cement boards, and KIRA (mica) is provided. Containing woody components, the crushed wastes contribute to the weight saving of the formed body. Contained inorganic components have remained reactivity and KIRA (mica) contains a large amount of silica components relating to the curing of the formed body, so that a large amount of the inorganic components and KIRA (mica) can be added to the body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic molding used for a building board, an interior decorative board, etc., and a method for producing the inorganic molding.

[0002]

2. Description of the Related Art A wood cement board is a material in which wood reinforcing materials such as wood chips, wood fibers and pulp are mixed with cement, molded into a plate and then cured and hardened. Currently, it is widely used as a building material such as outer wall material. ing. Therefore, a large amount of wood cement board waste material is generated when a building using the wood cement board is destroyed or repaired. Further, chips and scraps are also generated in the manufacturing process of the wood cement board. Recently, it has been considered to grind the wood cement board waste material and reuse it as one raw material of the wood cement board. On the other hand, Kira refers to clay with a large particle size that remains after collecting silica sand and frog grain clay from the clay.

[0003]

When the waste wood cement board waste material is reused as one raw material of the wood cement board, it cannot be added in a large amount from the viewpoint of ensuring the strength of the product. At present, the efficiency of use is low and most of them are discarded as industrial waste. In addition, Kira has no special reuse purpose, and almost all of them are currently discarded as industrial waste.

[0004]

As a means for solving the above conventional problems, the present invention provides a cement-based inorganic material,
It is intended to provide an inorganic molded body composed of a pulverized waste material of a wood cement board and a cured product of a raw material mixture mainly composed of kira. The average particle size of the pulverized waste wood cement board is 2
0 to 50 μm, and the average particle size of the glitter is 40 to 7
The content of the inorganic component in the ground waste material of the wood cement board is preferably 80 to 90% by weight, and the content of the wood component is preferably 10 to 20% by weight. It is desirable that the pulverized waste material of the wood cement board and kira are contained in a total amount of 50% by weight or less. The present invention further provides a method for producing an inorganic molded body, in which water is added to the above-mentioned raw material mixture, the mixture is filled in a mold and pressed to mold the molded product, and the molded product is cured and cured.

[0005]

In the present invention, since the inorganic molded body is mixed with the wood component derived from the pulverized waste wood cement board, the weight is reduced accordingly. Further, since the wood component has water absorbency and water retention, the apparent water ratio becomes low even if the water content is increased. Therefore, the shape retention of the raw material mixture is improved, the handling is facilitated, and the productivity is increased.

Since the shape retention of the raw material mixture is improved as described above even after molding and before curing, the molded product before curing does not lose its shape and can be easily transported together with the mold.

Further, since the inorganic component in the pulverized wood cement board waste material remains reactive, and the kira also contains a large amount of silica, it participates in the curing reaction of the molded product. Therefore, the strength of the molded product does not decrease even when a large amount of the pulverized wood cement board waste material or kira is mixed.

As described above, no effective recycling method has been found for the waste wood chips and shavings of the wood cement board, but according to the present invention, a maximum of 50% by weight of waste materials can be mixed in the compact. You can do it, and you can open the way for effective reuse.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
[Cement-based inorganic material] As the cement-based inorganic material used in the present invention, Portland cement, blast furnace slag cement, silica cement, fly ash cement,
There are cements such as alumina cement. The above cements may be used as a mixture of two or more, also silica powder,
Silica-containing substances such as silica sand, silica stone powder, water glass, silica fume, shirasu balloon, perlite, diatomaceous earth and dolomite may be mixed.

[Aggregate] In the present invention, an aggregate is usually added to the above-mentioned cement-based inorganic material. As the aggregate, for example, river sand, sea sand, crushed stone powder, crushed steel slag, pearlite, etc., may be used as a mixture of two or more kinds. The aggregate is usually added in a weight ratio of 30:70 to 70:30 with respect to the cement-based inorganic material.

[Crushed wood cement board waste material] The wood cement board waste material targeted by the present invention means a cement board reinforced by a wood reinforcing material such as wood chips, wood fibers or pulp, for example, as an outer wall material or a homogeneous member. These are waste materials generated when the building is demolished, refurbished, etc., or chips, scraps, etc., generated in the cutting process and the like when manufacturing the wood cement board.

The above-mentioned waste wood cement board is pulverized by an impact type pulverizer into a primary pulverized product having a particle size of usually 0.5 to 2.0 mm, and the primary pulverized product is secondary pulverized by a grinding type pulverizer to 1 μm or more. A secondary pulverized product having a particle size of 1000 μm or less is used as a raw material. The impact type crusher includes a hammer mill, an impact mill, and the like, and the attrition type crusher includes a centrifugal roller mill, a bawl mill, a Zego mill, an Ong mill, and a vertical mill using a vertical roller.

It is desirable that the secondary pulverized product has an average particle size of 20 to 50 μm by sieving or air classification. The inorganic component is 80 to 90% by weight and the wood component is 10 to 20.
The content of the pulverized product is preferably such that the pulverized product is sufficiently involved in the curing reaction of the molded product and the weight of the molded product is sufficiently reduced.

[Kira] Kira is composed of clay having a large particle size, which remains after collecting silica sand and fine grain frog clay from the clay. Kira particle size is usually 40-70 μm
Is.

[Third Component] In addition to the above materials, in the present invention, for example, pigments, dyes, water reducing agents, cement hardening accelerators,
A water repellent or the like may be used.

[Preparation of Raw Material Mixture] The above-mentioned cement-based inorganic material is added and mixed with the above-mentioned wood cement board waste material and kira. As described above, the wood-based cement board waste material and kira are the hardening of the cement-based inorganic material. Since the wood cement board waste material and the kira are included in the raw material mixture, a total of 5
It can be added up to 0% by weight.

[Molding] The inorganic molded body of the present invention is usually molded by casting into a predetermined shape, for example, a plate shape.
In cast molding, 15 to 20 parts by weight of water is added and kneaded to 100 parts by weight of the raw material mixture, and the mixture is filled into a molding die and pressed by a top plate from above. After molding, the product is immediately demolded, primary cured at a low temperature of 40 to 60 ° C. for 10 to 15 hours, and then autoclaved at 160 to 170 ° C. for 5 to 10 hours to obtain a product. A paint, a water repellent or the like may be applied to the surface of the above product. Examples and comparative examples of the present invention will be described below.

[Examples and Comparative Examples] As an example, a wood cement board waste material having the following composition was primarily pulverized by a hammer mill, and the primary pulverized material was ground by a roller mill, and then air-classified to have an average particle diameter of 40 μm. The thing was collected. This pulverized wood cement board waste material contains 8 inorganic components.
5% by weight and 15% by weight of wood component.

[Composition of Wood Cement Board Waste Material] Cement 37.5% by weight Quartz sand 10.5 〃 Fly ash 14.5 〃 Wood piece 8.5 〃 Wood fiber bundle 6.5 〃 Reject 18.0 〃 Expanded polystyrene beads 1.0 〃 Hardener 2.0 〃

A raw material mixture having the composition shown in Table 1 containing mainly cement-based inorganic material, the above-mentioned pulverized wood cement board waste material, and Kira was mixed and prepared by forced agitation using an Eyrich mixer. The raw material mixture was in a moist state, the raw material mixture was filled in a forming die, and the raw material mixture filled in the forming die was pressed with a top plate at a pressure of 20MP.
Pressed at a. After demolding, primary cure at 50 ° C for 12 hours,
After that, a sealer (non-transparent) was applied, and the autoclave secondary curing was performed at 165 ° C. for 8 hours.

[0021]

[Table 1]

As a comparative example, 50% by weight cement and 2 kira
A molded body was produced in the same manner as in the above-mentioned example using a raw material mixture containing 0% by weight and not containing the pulverized wood cement board waste material (Comparative Example 1). Furthermore, in addition to 36% by weight of cement, a raw material mixture (Comparative Example 2) in which the crushed waste material and kira are added in a total amount of 50% by weight or more (64% by weight), and the average particle size of the crushed waste material is 50 μm or more (75 μm). )
And the content of inorganic components is 55% by weight, and the content of wood components is 4
A molded body was produced in the same manner as in the above-mentioned example using the raw material mixture (Comparative Example 3) in which 5% by weight (20% by weight or more) was added by 30% by weight. Table 2 shows the results of measuring the physical properties of the above molded products.

[0023]

[Table 2]

As shown in Table 2, Examples 1, 2, 3, and 4 in which the raw material mixture contains the crushed wood cement board waste material and kira in a total amount of 50% by weight or less, Physical properties such as specific gravity, strength, and dimensional stability are stable even when compared to Comparative Example 1 not containing it, and the total amount of the pulverized waste material and kira is 50 wt%
The strength of Comparative Example 2 added as described above is remarkably reduced, and Comparative Example 3 containing 30% by weight of a pulverized waste material having an average particle size of 50 μm or more also has a low specific gravity, but is inferior in strength and dimensional stability.

[0025]

INDUSTRIAL APPLICABILITY In the present invention, a large amount of waste wood cement board and kira can be effectively used to obtain an inorganic molded body which is lightweight and has sufficient strength. Such an inorganic molded article is useful for a building board, an interior decorative board, and the like.

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) // C04B 111: 40 C04B 111: 40 F term (reference) 2E110 AA46 AB04 AB22 BA12 GA23W GA33W GA43W GB12W GB23W GB62W 4G012 PA25 PA30 PC11 PC12 PE03 PE06 4G054 AA01 AA20 AC04 BA02

Claims (6)

[Claims] 1. An inorganic molded article comprising a cement-based inorganic material, a pulverized waste material of a wood cement board, and a cured product of a raw material mixture mainly containing kira. 2. The inorganic molded body according to claim 1, wherein the crushed material of the wood cement board has an average particle size of 20 to 50 μm. 3. The molded inorganic material according to claim 1, wherein the average particle diameter of the glitter is 40 to 70 μm. 4. The content of inorganic components in the pulverized waste material of the wood cement board is 80 to 90% by weight, and the content of wood components is 10 to 10.
20% by weight, The inorganic molded body according to claim 1. 5. The inorganic molded body according to claim 1, wherein the raw material mixture contains a pulverized waste material of the wood cement board and kira in a total amount of 50% by weight or less. 6. The inorganic substance according to claim 1, wherein water is added to the raw material mixture, the mixture is filled in a mold and pressed to form a molded product, and the molded product is cured by curing. Molded body manufacturing method