JPS61284405A - Manufacture of abrasion-resistant extrusion molded board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a wear-resistant cement-based extrusion molded board that is highly useful as a building material.

(Problems to be solved by conventional techniques and inventions) Cement-based extruded plates have a wide range of uses as building and construction materials.
．． Surface coating has been carried out for the purpose of surface decoration or pattern formation, but the conventional methods rely on wet pouring or wet coating, and only require special equipment to adjust the mixture of materials. However, it also has drawbacks such as difficulty in adjusting the viscosity.

Original F! AI/'i eliminates these drawbacks of conventional methods and provides an efficient method for producing abrasion resistant extruded cement boards with superior quality surface coatings.

(Means for Solving the Problems and Actions/Effects) The present invention provides a roller at the top of an extrusion die for forming cement-based extrusion molded plates, and the gap between the roller and the die is used for hard aggregate, cement, and inorganic materials. The surface layer material mixed with an admixture is supplied in a dry state, leveled with a roller to a predetermined thickness and pressed onto an extrusion-molded raw board, and then glazed with approximately the amount of water required to harden the surface layer material. The amount of water that the surface layer material is scattered) is sprayed at a spray pressure that does not lose its shape, and after the surface layer material is fixed on the green board, the remaining water is sprayed at a higher spray pressure to form cement and A component of the invention is to deposit an inorganic admixture on the raw board and to expose the hard aggregate on the surface to fix the surface layer, thereby achieving wear-resistant extrusion molding of excellent quality. This made it possible to efficiently manufacture cement boards. The constituent elements of the present invention and their effects will be explained below.

First, in the present invention, the surface layer material is supplied in a dry state through the gap between the extrusion die and a roller provided at the upper part of the tip of the extrusion die, and this is leveled to a predetermined thickness by the roller and pressed onto the green plate. Therefore, the supply of surface material can be connected to the extrusion operation and carried out consistently and efficiently, without requiring special equipment as in the case of wet flow or coating methods. By installing the extrusion die so that its center is located slightly inside the tip of the extrusion die, the surface layer material forms a smooth surface layer in the form of being embedded in the molded raw board, and the thickness of the surface layer varies above and below the position of the roller. You can make arbitrary adjustments by setting 1.

Next, the present invention employs a unique two-step water sprinkling process to harden and fix the surface layer material pressed to the desired thickness on the green board as described above. That is, in the first stage and step 1, approximately the amount of water required to harden the surface layer material is sprayed at a low spray pressure that does not cause the surface layer material to scatter or lose its shape.
The surface material is fixed onto the raw board using a spray pressure of approximately 1 Kg/aa or less, usually 0.5 to 9/cd.
That's about it. Next, in the second stage, the remaining water is sprayed at a higher spray pressure than in the first stage to deposit cement and inorganic admixtures in the surface layer material, and as the hard aggregate is deposited on the surface. The surface layer itself is exposed and hardened and fixed onto the raw board. The spray pressure in this second stage is I Ky / a! Usually 1.5 to 2 Ky/
It is about cII. Spraying water in two stages in this way is not only to harden the surface layer, but also to expose the hard aggregate in the surface material to the surface to fully demonstrate wear resistance. As explained below, it is not possible to achieve the desired purpose with the repeated watering process. In other words, the total amount of water required for curing the surface layer material is O15Kf/cI.
Even if spraying I2 is carried out at once with a spray pressure of about I, the exposure of the hard aggregate is insufficient and the abrasion resistance cannot be fully exhibited. Furthermore, if water is sprayed at a spray pressure that sufficiently exposes the hard aggregate from the beginning, the dry surface layer material will scatter and lose its shape. Therefore, the two-stage watering process is an important essential process in the present invention.

Conventionally, when forming a colored layer on the surface of an extrusion-molded plate, a method is known in which the surface layer material is supplied dry (-1) and cured by spraying water (Japanese Patent Laid-Open No. 59-93309).
However, in this method, all of the water required for curing is sprayed at once, and no technology has been disclosed that is sufficient to suggest the two-stage water spraying process unique to the present invention. It goes without saying that it is difficult to fully expose the hard aggregate on the surface of the surface layer and improve wear resistance as in the present invention, even with conventional wet pouring or coating methods. .

The surface material of the present invention is hard aggregate (olivine sand,
The main ingredient is various types of silica stone, ceramic powder, etc.), and cement and inorganic admixtures (silica stone, diatomaceous earth, calcium carbonate, etc.) are blended with this. Use as little as possible without causing any harm. In addition, the particle size of the hard aggregate is usually about 1 to 3 u, and the thickness of the surface layer is about 1.5 to 3 u, but it is not limited to these. Note that the roll press pressure is about 5 to 6 Kq/ci.

Although the present invention can be efficiently implemented in the form shown in the drawings, this will be specifically explained below with reference to Examples.

(Example) Blend of extrusion materials Blend of surface layer materials Ordinary cement 100 parts by weight Foundry sand No. 3 100 parts by weight Silica powder 30 Ordinary cement 50 Asbestos
5 Sand stone powder 20 Pulp 1 Methylcellulose 1 Water 30 Extrusion molded raw board with the above composition (thickness 5 cm, width 60α)
The surface layer material was pressed on top with a roll press pressure of 5 and 9/Cl1 to a thickness of 2u, and the surface layer was hardened and fixed by spraying water at a rate of 118009/m, cut into lengths of 3 m, and dried in a conventional manner. The product is cured in an autoclave.

A (comparative example) Spraying 18009/mj at once at spray pressure a and sKg/crA.

B (present invention) 900 at a spray pressure of 0.5 Kp/i! ? Spread /m 1~
, after about 10-20 seconds, spray pressure 2, /d to 900,
! Spray /7F1″.

The performance of the A and B image processing products is as follows.

Surface layer adhesion strength Surface layer abrasion resistance (JIS K69
02) A 18Kg/d 46~/1
00 revolutions 8 25~/d 20■/10
0 rotation

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the method of carrying out the present invention, in which 1... extrusion die, 2... roller, 3... surface layer material supply container, 4... primary water sprinkler, 5... Secondary water sprinkler, 6.
...Extrusion molded raw board, 7...Surface layer.

Claims (1)

[Claims] Extrusion for forming cement-based extrusion molding plates: A roller is installed at the top of the tip of the die, and a surface layer material containing hard aggregate, cement, and inorganic admixtures is supplied in a dry state through the gap between the roller and the die, and the roller is used to form a predetermined sheet. While leveling the thickness, press it onto the extrusion-molded raw board, and then apply approximately 1/3 to 1/2 of the amount of water required to harden the surface layer material to an extent that the surface layer material does not scatter or lose its shape. After the surface layer material is fixed on the green board by spraying at a spray pressure of A method for manufacturing a wear-resistant extrusion-molded plate, characterized in that the surface layer is fixed by exposing the plate to.