JPS60161382A - Manufacture of glazed cement product - 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 The present invention relates to a method of manufacturing a glazed cement product using a cutting technique.

Glazed cement products have a beautiful surface and have excellent surface strength and durability. Conventionally, glazed cement products are made by adding water and aggregate to cement, and if necessary, various additives and reinforcing fibers. It is manufactured by kneading the raw material composition, molding it by a molding method such as pressure molding, extrusion molding, or pouring, and then glazing and firing the resulting molded product, and then re-treating it with a water phase. . This method not only requires a large amount of energy to fire the entire cement product, but also has the problem that it is difficult to control leakage during firing. Furthermore, there was also the problem that large cement products such as cast concrete sheets and boards could not be glazed due to the size limitations of the kilns used.

On the other hand, although the technique of welding the flake-like glaze component to the hardened cement body using gas spraying or plasma spraying has been studied for a long time, it has not yet been put to practical use. This is because, compared to glazed cement products obtained by firing in a kiln, the glazed surface was not smooth and there were problems such as foaming and repellency.

The present invention rectifies the shortcomings of the conventional manufacturing method of glazed cement products, and its gist is that the raw material composition is made by adding water and, if necessary, aggregate, various additives, and reinforcing fibers to cement. A glazed cement product is produced by kneading, molding, and calcining 1q of hardened cement, and then welding a frit-like glaze component to its surface using scum spraying or plasma melting technology. It's in the manufacturing method.

The present invention will be explained below based on FIG.

First, we will describe the manufacturing method of hardened cement body 1.
The cement used in the present invention can be arbitrarily selected from commonly used cements such as portland cement (-) and alumina cement. -C can be used as needed for the mother shrine used for menting, glass fibers, asbestos, steel fibers, etc. may be added as reinforcing materials, and various additives such as water reducing agents can be added as desired. , a curing accelerator, etc. can also be used.Water is added to the above raw material composition, kneaded, molded into a desired shape by a molding method such as pouring, pressure molding, extrusion molding, etc., and hardened. A hardened cement body 1 is created.

Next, this hardened cement body is calcined in a furnace 2 at a temperature of 500°C or higher, preferably 600°C or higher, to eliminate adsorbed water adhering to the surface and decomposition during thermal spraying in the next process. The structural water contained in the cement and the gas generated by the decomposition of various additives are removed in advance.

Subsequently, a frit-like glaze component is welded to the surface of the hardened cement body using ordinary gas molten copper or plasma molten 9A3, thereby making it possible to obtain a glazed cement product.

The frit-like glaze component used here may be, for example, a mixture of crow powder and a commonly used auxiliary agent such as zinc white or zircon and an inorganic pigment.

The particle size of the frit-like glaze component is desirably adjusted to between 40 and 160 microns. The frit-like glaze component is not particularly limited, but it is preferably one that has the characteristics of being softened at as low a temperature as possible and having high wettability.

In conventional glaze spraying technology, during thermal spraying, the bound water of cement 1 to hardened cement hydrate (e.g. Ca(OH)2゜calcium silicate hydrate) is dehydrated and water vapor is generated, and additives are However, in the present invention, by pre-calcining the hardened cement, the evaporated components in the hardened cement are not present at the time of thermal spraying. As a result, the adhesion of the molten glaze is not inhibited, and a hardened cement body with a smooth glazed surface and an excellent glazed surface free from defects such as foaming and repellency is produced.

However, depending on the calcination temperature, the strength of the hardened product may deteriorate, but in this case, as the applicant once filed in Japanese Patent Application No. 52-87196, rehydration may be necessary. There is no problem with the strength, as the strength will be restored after treatment.

Note that the evacuation of water vapor and soot during calcination can be more reliably performed by performing it in a furnace as described above, but this is not necessarily the case. C may also be used by heating to a temperature of In particular, this case has the advantage that repairs can be made to buildings that have already been constructed.

(Example) Cement 100 parts by weight Hardened cement Aggregate 100 ll Raw material composition (Chamotte) Asbestos 5 II Water 35 The above raw material composition was kneaded and molded, and further hydrated and hardened to obtain a hardened cement.

Next, this cement L-hardened body was calcined in a furnace at 800°C for 2 hours.

Calcined cement 1~Wl! The following frit was molten copper on the surface of the composite.

Frit: M25 manufactured by Hyuga Sangyo Co., Ltd. Particle size adjusted to 60 to 100 μ The spray gun is a 5P gun manufactured by Metco. Conditions of 60°C x 100% Rl-I x 48 hours to recover the strength loss of hardened cement due to calcination. It was steam cured.

As a result, a hardened cement product with a smooth surface and a uniform glazed surface without foaming or repelling was obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention. 1...Cement hardened body 2...Furnace 3...Cast spraying or plasma spraying patent applicant Ina Seito Co., Ltd. Figure 1 02222 Cohe 7 ↓ Procedures ■ヱE book (method) % Formula % 1. Indication of the case Patent Application No. 13797 of 1982 2. Name of the invention Method for manufacturing glazed products 3. Person making the amendment Relationship to the case Patent applicant address 479 II Ehonmachi, Tokoname City, Aichi Prefecture 3-6 ff105693-5-2700 4. Date of amendment order: April 4, 1982 (shipment date: 59.4..24) 5.
Subject of amendment 1) Full text of the specification 6, Contents of amendment 1) Engraving of the specification (no change in content) Procedures 1 tj original copy (spontaneous) June 1, 1980 Commissioner of the Patent Office Mr. Wanu Wakasugi 2, Name of the invention Method for manufacturing glazed cement products 3, Relationship with the case of the person making the amendment Patent applicant address 3-6-3 Koiegicho, Tokoname City, Aichi Prefecture 479
05693-5-2700 4. Date of amendment order Voluntary amendment 6. Contents of amendment 1) From page 3, line 20 of the specification to page 4, line 1 of ``500°C or higher, preferably 60°C. "Temperature of 0°C or higher" is corrected to "Temperature of 200°C or higher, preferably 300°C or higher and 950°C or lower." 2) Insert the following words after "F Water," on page 4, line 4 of the statement box. "Various gases generated from the cement itself," 3) Page 4, line 9 of the specification [...can be done. Insert the following words after ``. [Gas spraying or plasma spraying 3 refers to blowing a molten glaze component onto a hardened cement body using gas or plasma (or welding it to the surface with a sprayer, or
As described in Publication No. 3, it refers to a technique in which a glaze component previously applied to the surface of a hardened cement body is melted using the gas or plasma. ”

Claims (1)

[Claims] C
A method for producing a glazed cement product, which comprises preliminarily calcining a hardened cement product, and then welding a glaze component onto the surface of the hardened cement product by gas spraying or plasma cutting.