JPS63277583A - Improved glaze for coating and flame-spraying and glaze application - Google Patents

Abstract

PURPOSE:To obtain the title glaze by mixing glass fritts with a heat-resistant adhering inorganic substance, thus giving products with homogeneous gloss without peeling of the glaze layer with high fusing adhesion to the substrate and melting at low temperature. CONSTITUTION:(A) 100pts.wt. of glass fritts, when needed, are mixed with clay, electrolytes, water, pigments or the like and milled in a ball mill or the like into fine particles. When needed, an appropriate amount of an organic binder such as PVA is added to the particles and the mixture is combined with (B) 1-40pts.wt. of a heat-resistant adhering inorganic substance such as water glass of 2.1-3.5 SiO2/alkali molar ratio to give the title glaze. An inorganic substrate is coated with the glaze on its surface so that the amount of coating becomes 0.5-5g/100cm<2>, the surface is flame-sprayed to melt the glaze layer to form the glassy glaze layer.

Description

DETAILED DESCRIPTION OF THE INVENTION E-INDUSTRIAL APPLICATION FIELD The present invention relates to an improved glass glaze for coating and thermal spraying and a method for applying the same. Specifically, the present invention relates to the above-mentioned glaze, which is made by adding and mixing a heat-resistant adhesion inorganic substance to the glaze, and which increases the adhesion force (fusion force) when the glaze is melted and coated onto a base material, and a method for applying the glaze.

[Prior art and its problems] When forming a glaze layer by applying glaze to a base material for building materials, especially a base material with relatively low heat resistance such as a concrete board or a slate board,
After the glaze is applied to the substrate, a plasma or gas spraying device or other surface heating device is moved or the substrate is moved so that the spray flame or heat from the device coats the substrate. A method is known in which a glaze is melted to form a glassy layer.

The glaze is conventionally manufactured by making a sufficient cotton layer of glass fritz, which is the raw material for the glaze, and adding an appropriate amount of an organic binder to this to stabilize it as a slurry with an appropriate viscosity. applied onto the substrate. The glaze layer formed by coating is melted using a thermal spray heating device such as the one described above, and is fused onto the base material as a glass layer.

However, in this case, there was a large risk that the coating layer would peel off before the glaze layer was melted by the force of the spray flame generated from a thermal spraying device or the like and the glass layer was formed. Furthermore, some base materials have poor wettability (compatibility) with the glaze, and the glaze layer may peel off when the glaze is melted by a thermal spray flame or the like.

The phenomenon described in item 2 does not occur if the entire glazed base material is fired in a tunnel kiln (approximately 30 hours) or in a high-speed firing furnace (approximately 1 hour or more). It is. On the other hand, in thermal spraying using plasma flame or gas flame irradiation, the glaze melts substantially instantaneously, so this phenomenon is thought to occur.

Accordingly, an object of the present invention is to provide a glaze that improves the low adhesion of conventional glazes to substrates during thermal spray melting and improves both wettability, and a method for using the same.

[Means for solving the problems] The improved glaze of the present invention has glass frit 1 in the glaze.
It is characterized in that about 1 to about 40 parts by weight of a water-soluble or sol-forming heat-resistant adhesion inorganic material is added and mixed to 00 parts by weight.

The above glaze is made by thoroughly layering glass frit as a glaze raw material and, if necessary, clay, electrolyte, water, pigment, etc. using a ball mill or the like, and adding an appropriate amount of organic binder (for example, methyl cellulose, polyvinyl alcohol,
It can be produced by adding the above-mentioned heat-resistant adhesive inorganic substance in an amount within the range 1 above with starch, etc., and mixing thoroughly.

Examples of the above-mentioned heat-resistant adhesive inorganic substances include water glass; phosphoric acid compounds (e.g. aluminum phosphate, sodium phosphate, potassium phosphate, magnesium phosphate, phosphoric acid and phosphoric esters), boric acid compounds ( For example, concentrated aqueous solutions or aqueous sols such as sodium borate, potassium borate, boric acid and boric acid esters), silicate esters, colloidal silica, and alumina sol are exemplified.

Water glass is typically used.

The above-mentioned water glass means a concentrated aqueous solution (usually about 30% by weight or more) of an alkali-silicate glass. Here, the alkali is generally NatOlLizO and/or Kto, and the molar ratio of 5ift/alkali is usually 2.
．． 1 to 3.5. For example, concentrated aqueous solutions of lithium silicate, sodium silicate, and potassium silicate are exemplified, and commercially available water glass [composition (weight ratio), 5rOt]
: 30%, NatO: 10%, and Water: 60%.

The amount of the heat-resistant adhesive inorganic substance added is generally about 1 to about 40 parts by weight, preferably about 3 to about 30 parts by weight, and more preferably about 5 parts by weight, based on 100 parts by weight of the glass frit in the glaze.
~ Approximately 20 degrees of weight.

To form a glaze layer on a substrate using the glaze of the present invention, first apply the glaze to the surface of the substrate by air spraying, curtaining method, etc., dry the glazed surface, and then use a plasma spraying device.
The glazed surface is heated using a flame spraying device, a far infrared furnace, etc. to melt at least the surface of the glaze layer, thereby obtaining a vitreous yuzu layer. If a thermal spray device is used, it is preferable to orient the thermal spray gun perpendicularly to the glazed surface to ensure efficient heat utilization.

If the heat-resistant adhesive inorganic substance described above is applied to the surface of the base material before applying the glaze, the peeling resistance of the glaze layer is further improved. In this case, the amount of heat-resistant adhesive inorganic material applied is usually 0.5
~about 5 g/100 cm'.

The inorganic material may be applied by brushing or spraying.

The glazes of the present invention are applied to the substrate at a rate comparable to conventional glazes, usually from about 1 to about 100 g/100 cm'', typically from about 2 to about 30 g/100 cm''. The thickness of the resulting glaze layer is typically from 0.1 mm to several mm.

The glaze of the present invention is useful for lubricating concrete boards, slate boards, etc., but it can also be advantageously used for ceramic tile boards, metal boards, and other relatively heat-resistant inorganic materials.

[Example] The present invention will be explained in more detail with reference to the following examples.

Example 1 Nigarasu frit (weight composition is as shown in Table 1 below) 2000
g and 800 g of water were placed in a porcelain ball mill and rotated for 4 days and nights. 200 to 300 g of a 3% carboxymethylcellulose solution and commercially available water glass (weight composition; 5ift: 30%, Na*O: 10%) were added to the obtained slurry.
, water: 60%) was added, and the mixture was stirred for 30 minutes. After mixing, the mixture was passed through a 100-mesh sieve to remove large clumps to prevent clogging during spraying. The glaze prepared in this way is applied to the concrete base (
50 g of the sample was applied onto a surface (size: 300 x 300 x 80 mm) using an air spray device. Thereafter, it was left to dry in the air for 1 hour. Next, PT-A200 manufactured by Plasma Technique Co., Ltd.
Using a type 0 plasma spray gun, only the glaze coating was melted under the following conditions. Plasma flame scanning speed: 50-15 mm/sec Scanning width: 2 mm Distance between substrate and plasma gun M: 9-12 cm Plasma generation conditions = 400- 600A.

65-75v.

Ar flow rate ~60Q/min.

H2 flow rate lO~1512/min.

Table 1 LigO0-5% Z n OO-10% Na tO
O~10%B tO31~20%K tOO~lO%A
lt030~15% MgO0~5% S i Ot 2
0-50% Ca0O-5% Z r Ot 5-10%
In this way, a glossy surface of the glaze layer was obtained. When a conventional glaze was used, the glaze layer often peeled off during thermal spraying, whereas the glaze layer of this example did not peel off at all. Furthermore, since the glaze has a somewhat lower melting point than conventional glazes, a good glossy surface could be obtained with low output.

Example 2: Approximately 50% of the glaze prepared in the same manner as in Example 1 was applied onto the unglazed tile base (loOXloOmm square) by air spraying.
g was applied. Thereafter, it was left in the air for about 1 hour to dry the glazed surface. Then, using the flame of a Metco 5F gun (gas spraying device), only the glaze coating was melted under the following conditions: Flame scanning speed = 5 to 20 mm/sec Scanning width: 5 to 20 mm Base material - Thermal spray gun Distance: 212~20cm Gas flow rate:
Oxygen 35a/min, acetylene 35Q/min.

In this way, a glossy surface of the glazed layer on the tile base was obtained. The glazed layer did not peel off at all during flame spraying. Furthermore, since the glaze used in this example had a somewhat lower melting point than conventional glazes, a good glossy surface was obtained even when the scanning speed was increased.

Example 3: Brush commercially available water glass (Sift: 30%) onto a tile unglazed base (100 x 100 mm square).

About 1 g of Na, O: IQ%, water = 60%) was applied, and on top of that, about 5 g of the water glass-added glaze prepared in Example 1 was applied by air spray. Thereafter, the oiled surface was dried by leaving it in the air for 2 hours. The glaze coating was then melted using the same equipment as in Example 2 under the same conditions to obtain a glossy surface. No peeling occurred on the oiled surface during thermal spraying, and the surface condition was good. Further, even when the scanning speed was increased, a good glossy surface was obtained.

[Action and effect]

Claims (6)

[Claims] (1) A glaze for coating and thermal spraying, characterized in that 1 to 40 parts by weight of a heat-resistant adhesive inorganic substance is added and mixed with 100 parts by weight of a glass frit component in the glaze. (2) the heat-resistant adhesive inorganic substance is water glass;
The glaze according to claim 1. (3) The glaze according to claim 1 or 2, wherein the amount of the heat-resistant adhesive inorganic substance added is 3 to 30 parts by weight per 100 parts by weight of the glass frit component. (4) Glass frit component 100% on the surface of the inorganic base material
Applying a glaze to which 1 to 40 parts by weight of a heat-resistant adhesive inorganic substance is added and mixed, and then heating and spraying the glazed surface to melt the glaze layer and form a vitreous glaze layer. A glazing method characterized by (5) The method according to claim 4, wherein a heat-resistant adhesive inorganic substance is applied onto the surface of the inorganic base material before applying the glaze. (6) the heat-resistant adhesive inorganic substance is water glass;
The method according to claim 4 or 5.