JPH03257052A - Production of building material - Google Patents

Abstract

PURPOSE:To improve workability such as especially nailing for building material produced by extrusion by blending both the organic lightweight aggregate and a water-soluble high polymer exclusive of a thickener with a raw material for extrusion which incorporates a hydraulic binder and reinforcing fiber as an essential component. CONSTITUTION:In the case of producing building material by extruding a raw material which is constituted of at least a hydraulic binder and reinforcing fiber, organic lightweight aggregate and a water-soluble high polymer exclusive of a thickener are blended with the above-mentioned raw material. As the organic lightweight aggregate, wood flour and chaff powder, etc., are shown and its usage is preferably regulated to 2-10wt.%. As the water-soluble high polymer exclusive of the thickener, such substance is desirably utilized that it is made insoluble at a time for mixing and kneading the raw material and dissolved during curing and impregnated into a matrix. For example, PVA having the degree of saponification of 95-100% is utilized at about 0. 5-3wt.%. As the thickener, methyl cellulose is preferably utilized. As the hydraulic binder, e.g. normal portland cement and alumina cement, etc., are utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a method for manufacturing building materials by extrusion molding.

<Prior art> Inorganic extrusion molded building materials obtained by extrusion molding are widely used as building materials mainly for exterior wall materials, and their manufacturing methods include cement, hydraulic binders such as slag, asbestos, A mixture containing reinforcing fibers such as bulbs and thickeners such as methylcellulose is extruded while being shaped, and products are obtained by steam curing at normal pressure or high temperature and pressure.

In addition, general building materials require workability such as nailability. In order to impart this performance, it is widely practiced to add inorganic lightweight aggregates (perlite, shirasu balloons, etc.).

However, in extrusion-molded building materials, sufficient workability such as nailing performance cannot be ensured simply by adding inorganic lightweight aggregates (perlite, shirasu balloons, etc.).

<Problems to be Solved by the Invention> The present invention aims to solve the problems of the prior art, that is, to provide a method for manufacturing extrusion-molded building materials with improved workability, particularly nailing properties. It is something.

Means for Solving the Problems> That is, the present invention provides a method for manufacturing building materials by extrusion molding a raw material composed of at least a hydraulic binder and reinforcing fibers, by adding an organic lightweight aggregate and a thickening agent to the raw material. The present invention provides a method for producing a building material characterized by containing a water-soluble polymer other than the above.

The present invention will be explained in detail below.

In the present invention, the hydraulic binder may be any commercially available ordinary Portland cement, alumina cement, etc. as long as it hardens by hydrolysis and has a binding effect. In addition, when performing high-temperature and high-pressure curing, calcareous raw materials such as quicklime and slaked lime, and silicic raw materials such as silica sand, diatomaceous earth, clay, silica gel, and white carbon.

Silica dust etc. can be used.

As the reinforcing fibers, the type is not specified as long as they are reinforcing fibers, but in general, fibers conventionally used for reinforcing cement materials can be used, and asbestos may not be used. That is, inorganic fibers such as alkali-resistant glass fibers and carbon fibers, and organic fibers such as various natural fibers and synthetic fibers can be used. The amount of reinforcing fiber used is generally 0.5
~10% by weight is used. If it is less than 0.5%, the reinforcing effect of the fibers will not be exhibited, and if it is added in an amount of 10% or more, extrusion molding becomes extremely difficult. It is desirable to add less than 5% of organic fibers, such as bulbs and rayon, if fire resistance is required.

The organic lightweight aggregate preferably has a bulk specific gravity of less than 0.7, an elastic modulus of less than 0.6 x lo'kg/cm'', and an average particle size of 0.3 to 2.0 mm. If the average particle size is less than 0.3 mm, the effect of improving workability will not be fully exhibited, and the solubility ratio of sugars may cause poor curing.If the average particle size is 2.0 mm or more, the effect of improving workability will not be fully exhibited. However, it is not preferable because it significantly impairs the surface properties.Also, it is not preferable if the bulk specific gravity is 0.7 or more or the elastic modulus is 0.
．． If it exceeds 6 x 10'kg/cm", it is undesirable because the nailing performance deteriorates. Examples of organic lightweight aggregates include wood flour and rice husk flour.

The amount of organic lightweight aggregate used is preferably 2 to 10% by weight, and if it is less than 2%, the effect of improving workability will not be sufficiently exhibited. If it exceeds 10%, it is not preferable because it causes a significant decrease in strength.

The water-soluble polymer other than the thickener is desirably one that is insoluble in water at the time of raw material mixing and mixing, but dissolves during curing and is impregnated into the matrix. Water-soluble polymers other than thickeners have a saponification degree of 95.
-100% polyvinyl alcohol, etc. are exemplified.

The amount used is 0.5-3% by weight. If it is less than 0.5%, the effect of improving workability will not be sufficiently exhibited, and if it is more than 3%, there is a risk that the effect will be poor.

Methyl cellulose is preferred as the thickener, and the amount used is generally 0.2 to 2% by weight. If it is less than 0.2%, sufficient thickening effect will not be exhibited, and if it is more than 2%, the effect may be significantly delayed.

The molding water is preferably 35 to 70% by weight based on the total solid content, and if it is less than 35%, the extrusion molding pressure becomes high and molding becomes extremely difficult. If it exceeds 70%, extrusion is possible, but
It becomes difficult to maintain the desired shape.

The raw materials blended in this way are extruded, and if necessary,
Primary curing is performed under saturated steam at 0 to 80°C to obtain handling strength of the molded product. This is then cured at high temperature and pressure as necessary. The saturated steam temperature at this time is preferably 120 to 200°C.

<Examples> The present invention will be described below with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Examples 1 to 3 and Comparative Examples 1 to 3 The compositions and blending ratios shown in Table 1 were used. The raw materials and extrusion molding equipment used on each side are as follows.

Raw material cement; Fuji ordinary Portland cement silica powder; Chichibu powdered silica methyl cellulose; Shin-Etsu Chemical Co., Ltd.'s "Metrose 90SHJ" Glass fiber; Asahi Glass Co., Ltd.'s "Alfiber mmj"Perlite; Toko Perlite "Tobuco 2B" Wood powder; Sawdust (average particle size 0 .3-2 mm) Rice husk powder: "Sumicelco C" manufactured by Sumikin Bussan Co., Ltd. Polyvinyl alcohol: "Poval" manufactured by Kuraray Co., Ltd. Extrusion molding device: rDE-130 type manufactured by Honda Iron Works Co., Ltd."
The raw materials were thoroughly mixed in powder form according to Table 1, then kneaded with water and molded in an extruder using a die having the shape shown in FIG. This molded body was heated at 60℃ under saturated steam for 16 hours.
After being cured for several hours, the sample was cured in an autoclave at a saturated vapor pressure temperature of 150°C for a holding time of 8 hours.

The results are shown in Table 2. As a result, in Comparative Example 1, the extrusion molding pressure was too high to carry out extrusion molding. In Comparative Example 2, extrusion was possible, but the shape could not be maintained. In Comparative Example 3, nailing performance could not be ensured. In contrast,
In Example 1-3, it is possible to manufacture an extrusion molded product having a complex shape that is excellent in nailing and workability and has sufficient bending strength.

Table 1 W is the amount of water added, S is the total solid content including fibers Table 2 It was determined whether the body could be obtained or not. × indicates that no molded body was obtained.

*2) Nailing performance was determined by determining whether or not a stainless steel nail with a diameter of 2.2 mm could be driven.

× indicates that nailing is not possible, or that chipping or cracking has occurred.

3) Workability was determined by whether it could be cut and cut with a cutter knife.

× indicates that cutting is not possible.

<Effects of the Invention> According to the present invention, an extrusion-molded product can be obtained that has excellent workability such as nailing ability, does not sag even when formed into a complicated shape, and has strength as a building material.

[Brief explanation of drawings]

FIG. 1 is a cross section of the die used for moldability evaluation.

Claims (1)

[Claims] A building material characterized in that, in manufacturing a building material by extrusion molding a raw material composed of at least a hydraulic binder and reinforcing fibers, the raw material contains an organic lightweight aggregate and a water-soluble polymer other than a thickener. manufacturing method.