JPH0483776A - Patterning of extrusion moldings of ceramics - 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] [Industrial Application Field J] The present invention relates to a method for patterning a ceramic extrusion molded body, and more specifically, it relates to a method for patterning a ceramic extrusion molded body, and more specifically, it relates to a method for patterning a ceramic extrusion molded body, and more specifically, by polishing the surface, it is possible to create a smooth surface that resembles a natural stone. This invention relates to a method for attaching a highly decorative pattern to a ceramic extrusion molded body.

[Prior Art] The present inventors have been engaged in the production of ceramic extrusion molded bodies and the development of high value-added molded bodies, especially the development of interior and exterior building materials with smooth surfaces and excellent decorative properties. A new method for patterning ceramic extrusion molded bodies, which is different from conventional and glazing methods, is: 1) Add pigment to the base material in the hopper of an extruder, extrude it, and then slice, dry, and fire the molded body.

(Japanese Patent Application No. 2-14782) (2) Particulate glass is press-fitted onto the surface of the extruded molded body and fired. (Japanese Patent Application No. 2-129306) (2) An electric plate is placed on the surface of the extruded molded body and fired in an oxidizing or reducing atmosphere. (Japanese Patent Application No. 2-12-12) Various methods were proposed, but there was a need to develop a method for patterning ceramic extrusion molded bodies with smooth surfaces and excellent decorative properties, such as imitations of natural stone.

[Problems to be solved by the invention] In order to solve the above-mentioned demands for the prior art, the present invention solves the following problems:
The purpose of the present invention is to provide a novel method for applying a pattern on the surface of a ceramic extrusion molded body, which has a smooth surface and is highly decorative, resembling a natural stone.

[Means for Solving the Problems] The present inventors have investigated compounds that have a color similar to that of colored natural minerals, and at the same time have developed methods for coloring ceramic extrusion molded bodies, such as the compatibility of these with ceramic raw materials and the density of the product. As a result of extensive research, we have established a method for patterning ceramic extrusion molded bodies that has excellent decorative properties and uniform physical properties.

The gist of the present invention is to provide a pattern on an extruded ceramic body by adding a pigment to a powder raw material, kneading it, granulating it, calcining it, crushing it, sizing it, and using it as a colored raw material. , the colored raw material is supplied to an extrusion molding machine simultaneously with the main raw material obtained by kneading the powdered raw material, the extruded body is dried and sintered,
This provides a method for patterning a ceramic extrusion molded body, which is characterized by polishing, in which the amount of pigment added to the powder raw material is 10% by weight or less, and the particle size of the coloring raw material is 0.25%.
It is preferable that the water absorption rate of the coloring raw material is 8 to 12%, and the mixing ratio of the coloring raw material to the main raw material is 5 to 20%.

[Function J] The powder raw materials used in the method of the present invention include powders of clay, pottery stone, feldspar, anti-flintstone, wollastonite, talc, chamotte, etc., taking into consideration moldability, strength after sintering, color tone, etc. used alone or in combination.

It is preferable that the fineness of the powder raw material is in the range of about 200 to 300 mesh. +200 mesh is insufficient in formability due to the small fineness, and the product after sintering will not be dense.
There is a risk that the strength etc. will be adversely affected, and on the other hand, if the powder is 1300 mesh and has a high degree of fineness, the grinding cost will increase, the cost of raw materials will increase, and ultimately the price of the product will increase, which is not preferable.

Pigments include blue, brown,
Colors such as green are used.

The amount of pigment added to the powder raw material is determined by the density of the pattern, but is preferably 10% by weight or less. 1
If it exceeds 0% by weight, the difference in composition between the coloring raw material and the main raw material becomes large (the difference in composition between the coloring raw material and the main raw material becomes large), the adhesion of the coloring raw material to the main raw material after sintering decreases, and there is a risk that the coloring raw material will peel off during polishing.

Water is added in an amount of about 15 to 25% by weight of the blended raw material to a blended raw material obtained by adding a pigment to a powdered raw material, and the mixture is granulated using a known granulator.

After drying, the granules are calcined at 700 to 900'C for 1 to 2 hours to obtain calcined granules.

Next, the calcined granules are crushed by a crusher, and the sieved material is sized using a sieve or the like. The particle size of the sized coloring raw material is 0.25
The thickness is preferably 1 mm, and the water absorption rate is 8
The content is preferably 12% to 12%, and the calcination conditions are determined taking these into consideration.

If the particle size of the coloring raw material is less than 0.25 mm, the pattern tends to be unclear, and if it exceeds 1 mm, mixing with the main raw material and extrusion moldability may become insufficient.

When the water absorption rate of the coloring raw material is 8 to 12%, it becomes compatible with the main raw material, has good mixing and extrusion moldability with the main raw material, and improves the adhesion of the coloring raw material to the substrate in the polishing process after sintering. The properties become better.

The coloring raw material is conveyed to the raw material supply port of the extrusion molding machine, and is supplied to the extrusion molding machine simultaneously with the main raw material obtained by kneading the powdered raw material, and an extrusion molded article of an arbitrary shape is molded.

The coloring raw materials are directly fed to the extruder at the same time as the main raw materials, so the coloring raw materials are not subject to unnecessary pulverization.

Moreover, since it is extruded in a non-uniformly dispersed state in the main raw material, when the molded body is sintered and polished, some of it will appear on the polished surface, creating a pattern similar to natural stone on the smooth polished surface. Can be attached.

The mixing ratio of coloring raw materials is 5 to 20% by weight based on the main raw materials.
It is preferable to have a clear pattern and good moldability.

After drying, the extrusion molded product obtained in this way is introduced into a firing furnace and sintered to obtain a ceramic extrusion molded product, and the surface is further polished with a stone polishing machine to produce a natural stone. A highly decorative patterned ceramic extrusion molded body having similar patterns is formed.

In the present invention, if the coloring material is JP-A-2-3084
When colored minerals such as marble and pyroxene are used in the hydraulic extrusion molded body disclosed in Publication No. 7, the molded body may explode during the sintering process, and the adhesion between the colored mineral and the body of the molded body is weak. However, in the present invention, since the base material composition of the coloring raw material is the same as that of the molded body, it is possible to ensure the uniformity of the physical properties of the molded body after sintering, that is, to make it into a ceramic, and the coloring material within the molded body peels off. There is no large difference in density, the pattern does not peel off during the polishing process, and the strength of the molded product is increased.

[Example] Powdery degree -200 mesh clay 36 parts, fineness -2
A powder raw material was prepared by mixing 15 parts by weight of chinastone of 00 mesh and 32 parts by weight of feldspar of -200 mesh, and 17 parts by weight of water was added to this powder raw material and kneaded to obtain the main raw material of the present invention.

On the other hand, 2 parts by weight of a pigment (manufactured by Isekyusha Co., Ltd., ocean blue) and 20 parts by weight of water were added to 100 parts by weight of the powder raw material prepared in the same manner as above, and the mixture was kneaded and made into particles with a diameter of about 10 mm using a granulator. It was grainy.

After sufficiently drying the granules, they were calcined in a reducing atmosphere furnace at 800°C for 1 hour, and the calcined granules were crushed using a ball mill and then sized to a size in the range of 0.25 to 1 mm using a vibrating sieve. It was granulated to create a colored raw material.

Using a screw extrusion molding machine with a screw diameter of 200 mm, both raw materials were mixed on a belt conveyor whose blending ratio between the main raw material and the coloring raw material was adjusted so that the coloring raw material was 10% by weight relative to the main raw material. Transfer to extrusion molding machine, width 30
A hollow extrusion molded body having a diameter of 0 mm, a thickness of 20 mm, and a length of 600 mm was created.

After drying this hollow extrusion molded body, the temperature of the fired body was 1100.
It was sintered in a firing furnace set at ℃ to obtain a ceramic extrusion molded body.

When the obtained molded body was fractured and its fractured surface and surface were observed with a scanning electron microscope, it was found to be dense with no voids.

In addition, after polishing the surface with a stone polisher, it had a good gloss (and a pattern that was even more decorative than natural stone).

[Effects of the Invention] By the patterning method of the ceramic extrusion molded body of the present invention, it was possible to produce an interior/exterior-like building material with a smooth surface that imitates natural stone and has excellent decorative properties.

Claims (1)

[Claims] 1. A method for patterning a ceramic extrusion molded body,
A pigment is added to the powder raw material, kneaded, granulated, calcined, crushed, and sized to obtain a coloring raw material, and the coloring raw material is put into an extrusion molding machine at the same time as the main raw material obtained by kneading the powder raw material. A method for patterning a ceramic extrusion molded body, which comprises supplying a ceramic extrusion molded body, drying the extrusion molded body, sintering the body, and polishing the extrusion molded body. 2. The method for patterning a ceramic extrusion molded body according to claim 1, wherein the amount of pigment added to the powder raw material is 10% by weight or less. 3. Claim 1, wherein the coloring raw material has a particle size of 0.25 to 1 mm.
The described method for patterning a ceramic extrusion molded body. 4. The method for patterning a ceramic extrusion molded body according to claim 1, wherein the coloring raw material has a water absorption rate of 8 to 12%. 5. The method for patterning a ceramic extrusion molded body according to claim 1, wherein the mixing ratio of the coloring raw material to the main raw material is 5 to 20% by weight.