A slip composition suitable for thin edge pots and a method of making the same

Abstract

The application relates to the technical field of glazes, and particularly provides a glaze composition suitable for a thin-edge basin and a preparation method thereof. Solid raw material components of the glaze composition of the thin-edge basin according to the application include, in terms of weight fractions, 15-30 parts of potassium feldspar, 3-10 parts of spodumene, 20-30 parts of quartz powder, 5-16 parts of kaolin, 1-8 parts of alumina powder, 2-7 parts of calcite, 20-28 parts of wollastonite, 0.5-3 parts of zinc oxide, 1-5 parts of talc powder and 5-11 parts of zirconium silicate. Further, the spodumene, the calcite, the zinc oxide and the talc powder can be pre-blended and calcined. Further, a small amount of silicone resin microspheres can be added to the solid raw material components. The glaze composition according to the application has the characteristics of few pinholes, low water absorption, high gloss and few cracks.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glaze, in particular to a glaze composition suitable for thin-edge basin and a preparation method thereof. BACKGROUND

[0002] The sanitary product of thin-edge basin has more beautiful features. In order to realize the thin-edge basin, the slurry used must adopt the low-shrinkage mud, but the volume shrinkage rate of the conventional glaze slurry and the low-shrinkage mud is quite different after sintering, which leads to the easy cracking of the glaze surface after sintering, commonly known as shocking glaze, glaze cracking, shocking wind, and exploding glaze, etc., affecting the appearance and quality of the product. In the prior art, lithium mica is added to the glaze to reduce the volume shrinkage rate, and the lithium mica also has the effect of dissolving agent, which can reduce the sintering temperature, improve the mechanical strength, thermal shock resistance and chemical stability, etc. Since the edge of the thin-edge basin is thinner, the volume shrinkage after sintering is more obvious, therefore, it is necessary to further analyze the glaze to reduce the cracking after sintering. SUMMARY

[0003] In order to further improve the performance of the glaze, the inventors have carried out a large number of tests and research analysis. Based on this, the present application proposes a glaze composition suitable for thin-edge basin and a preparation method thereof.

[0004] The present application adopts the following technical scheme:

[0005] A glaze composition suitable for thin-edge basin, the solid raw material components of the glaze composition, by weight fraction, include: 15-30 parts of potassium feldspar, 3-10 parts of lithium mica, 20-30 parts of quartz powder, 5-16 parts of kaolin, 1-8 parts of alumina powder, 2-7 parts of

[0006] calcite, 20-28 parts of wollastonite, 0.5-3 parts of zinc oxide, 1-5 parts of talc powder and 5-11 parts of zirconium silicate.

[0007] Preferably, the lithium mica accounts for 3-10% of the weight percentage of the solid raw material components.

[0008] Preferably, the kaolin is composed of uncalcined kaolin and calcined kaolin in a weight ratio of 1:1-3.

[0009] Preferably, the lithium mica, the calcite, the zinc oxide and the talc powder are pretreated by the following method: after mixing the lithium mica, the calcite, the zinc oxide and the talc powder, grinding to not more than 100 mesh, heating to 1100-1200℃ for calcination for 0.5-2 hours, cooling, and grinding to not more than 100 mesh.

[0010] More preferably, the oxygen volume percentage content in the atmosphere of the calcination is not more than 10%.

[0011] More preferably, the volume percentage of inert gas in the calcination atmosphere is not less than 85%.

[0012] More preferably, the specific process of temperature rising is as follows: 1-3 hours from room temperature to 600-700℃, constant temperature for 0.5-2 hours, continue to rise for 1-2 hours to 1100-1200℃, constant temperature calcination for 0.5-2 hours.

[0013] A preparation method of the glaze paste composition suitable for the rimmed basin according to any one of the above embodiments, comprising: mixing each of the solid raw material components, adding water, ball milling to a residue of 325 mesh not more than 0.1%, and a weight content of the raw material components with a particle size less than 10μm of 65-78%, and obtaining.

[0014] Preferably, after mixing each of the solid raw material components and adding water, before the ball milling, further comprising: adding 0.1-0.5% of the weight of each of the solid raw material components of silicone resin microspheres.

[0015] More preferably, the average particle size of the silicone resin microspheres is 0.1-10μm.

[0016] In summary, the present application has the following beneficial effects:

[0017] 1. In the present application, spodumene, calcite, zinc oxide and talc powder are mixed together and calcined, and it is found that when added to the glaze paste composition, the shrinkage rate of the glaze paste and the shrinkage rate of the body are more matched, and the cracking of the glaze surface is less.

[0018] 2. In the present application, lower particle size silicone resin microspheres are added during the preparation of the glaze paste, and it is found that the number of pinholes and cracking of the glaze surface can be further reduced. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described in detail below.

[0020] Throughout this specification, unless otherwise specifically indicated, the terms used herein are understood to have the meanings commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs. If there is a contradiction, the present specification takes precedence.

[0021] The application provides a glaze composition for a thin-edge basin, and the solid raw material component of the glaze composition comprises, in parts by weight, 15-30 parts of potassium feldspar, 3-10 parts of spodumene, 20-30 parts of quartz powder, 5-16 parts of kaolin, 1-8 parts of alumina powder, 2-7 parts of calcite, 20-28 parts of wollastonite, 0.5-3 parts of zinc oxide, 1-5 parts of talc powder and 5-11 parts of zirconium silicate.

[0022] Li2O in the spodumene is the strongest flux among alkali metal oxides, can accelerate the melting process of the glaze, and improve the gloss, chemical stability and elasticity of the glaze, and can simultaneously solve part of the pinhole and uneven glaze defects, so that the glaze has the characteristics of good gloss, high thermal stability and high product quality. The spodumene is added in the glaze composition of the thin-edge basin, so that the volume shrinkage rate of the glaze can be reduced, and the volume shrinkage rate of the glaze body of the thin-edge basin is more matched.

[0023] In a preferred embodiment of the application, the weight percentage of the spodumene in the solid raw material component is 3-10%. If the spodumene is added too much, the glaze is prone to overfiring. If the spodumene is not enough, it is not easy to reduce the shrinkage rate. For example, the weight percentage of the spodumene in the solid raw material component can be 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11% and the like, but is not limited to the above examples.

[0024] In a preferred embodiment of the application, the kaolin is composed of uncalcined kaolin and calcined kaolin at a weight ratio of 1:1-3. Compared with uncalcined kaolin, calcined kaolin has reduced water content, increased silicon dioxide and aluminum trioxide content, increased active points, changed structure, smaller and more uniform particle size, but the use of calcined kaolin may also increase the sintering temperature of the glaze composition, resulting in a dry and dull glaze. The kaolin composed of uncalcined kaolin and calcined kaolin can take advantage of the characteristics of calcined kaolin and avoid the influence of its adverse factors.

[0025] In a preferred embodiment of the application, the spodumene, calcite, zinc oxide and talc powder are pretreated in the following manner: the spodumene, calcite, zinc oxide and talc powder are mixed and ground to not more than 100 mesh, calcined at 1100-1200℃ for 0.5-2 hours, cooled and ground to not more than 100 mesh. By using the above technical solution, the spodumene, calcite, zinc oxide and talc powder are pretreated and sintered, which is found to further reduce the cracking and pinhole phenomenon of the glaze, lower the water absorption rate, and improve the flatness of the glaze and the gloss.

[0026] In a more preferred embodiment of the present application, the volume percentage of oxygen in the calcination atmosphere is not more than 10%. Controlling the content of oxygen in the calcination atmosphere can avoid affecting the quality of the product. Preferably, the volume percentage of oxygen is not less than 3%, for example, the volume percentage of oxygen can be 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, or 10%, but is not limited to the above examples.

[0027] In a more preferred embodiment of the present application, the volume percentage of inert gas in the calcination atmosphere is not less than 85%. In the present application, the inert gas can be nitrogen, helium, argon, or other gases that do not react with spodumene, calcite, zinc oxide, and talc powder at the calcination temperature. From the cost point of view, it is more appropriate to use nitrogen as the inert gas. For example, the volume percentage of inert gas can be 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, or the like, but is not limited to the above examples.

[0028] In a more preferred embodiment of the present application, the specific procedure for temperature rising is as follows: 1-3 hours from room temperature to 600-700°C, constant temperature for 0.5-2 hours, continue to rise for 1-2 hours to 1100-1200°C, constant temperature calcination for 0.5-2 hours. Preferably, the temperature for constant temperature calcination is 1100-1160°C.

[0029] Another aspect of the present application provides a preparation method of the glaze slip composition suitable for the thin-edge basin according to any one of the above embodiments, comprising: mixing the solid raw material components, adding water, and ball milling to obtain a raw material component with a weight content of 65-78% and a particle size of not more than 10 μm. Preferably, the weight content of the raw material component with a particle size of less than 10 μm is 70-78%. In the present application, the relative specific gravity of the glaze slip composition is preferably 1.32-1.50, or more preferably, the relative specific gravity is 1.36-1.48.

[0030] In one preferred embodiment of the present application, after the solid raw material components are mixed and added to water, before ball milling, the method further comprises adding 0.1-0.5% of silicone resin microspheres by weight of the solid raw material components. The silicone resin microspheres have a good spherical structure, and when added during ball milling of the solid raw material components, can reduce the frictional resistance between the solid raw material components, thereby improving the efficiency of ball milling, allowing better dispersion of the solid raw material components, and reducing the carbon content of the silicone resin microspheres, thereby not affecting the quality of the glaze and improving the performance of the glaze slurry composition. In the present application, the silicone resin microspheres can also be mixed with the solid raw material components in advance and then added to water for ball milling. For example, the weight of the silicone resin microspheres can be 0.1%, 0.12%, 0.15%, 0.18%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, etc., but is not limited to the above examples.

[0031] In a more preferred embodiment of the present application, the average particle size of the silicone resin microspheres is 0.1-10 μm. For example, the average particle size of the silicone resin microspheres can be 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc., but is not limited to the above examples.

[0032] The technical solutions of the present application are described in detail below with reference to examples and comparative examples. Unless otherwise specified, the parts in the following examples and comparative examples are parts by weight.

[0033] Example 1

[0034] The solid raw material components, 21 parts of potassium feldspar, 7 parts of spodumene, 21 parts of quartz powder, 8 parts of calcined kaolin, 5 parts of alumina powder, 3 parts of calcite, 23 parts of wollastonite, 1.5 parts of zinc oxide, 3 parts of talc powder, and 7.5 parts of zirconium silicate, are added to water, the weight ratio of high-alumina stone ball to the slurry is 1.7:1, the filling rate is 0.35, and the ball milling is performed until the weight content of the raw material components with a particle size of less than 10 μm and a sieve residue of not more than 0.1% is 72%. After filtration, a glaze slurry composition is obtained, and the relative specific gravity is measured to be 1.417.

[0035] Example 2

[0036] In Example 1, the 8 parts of calcined kaolin are adjusted to a combination of 3 parts of uncalcined kaolin and 5 parts of calcined kaolin, and the remaining steps remain unchanged.

[0037] Example 3

[0038] In Example 2, the spodumene, calcite, zinc oxide and talc powder are pre-processed as follows: the spodumene, calcite, zinc oxide and talc powder are mixed and ground to not more than 100 mesh, and then added to a calcining furnace, the atmosphere of which is composed of oxygen and nitrogen in a volume ratio of 7:93, and heated from room temperature to 650°C over 2 hours, held at this temperature for 1 hour, and then heated to 1120-1150°C over 1.5 hours and calcined for 1 hour, and then cooled and ground to not more than 100 mesh. The remaining steps remain unchanged.

[0039] Example 4

[0040] In Example 2, after the solid raw material components are added to water, 0.3 parts of silicone resin microspheres having an average particle size of 3 μm are added, and then ball-milling is performed. The remaining steps remain unchanged.

[0041] Example 5

[0042] The solid raw material components are 24.5 parts of potassium feldspar, 5.3 parts of spodumene, 26.6 parts of quartz powder, 4 parts of uncalcined kaolin, 5.2 parts of calcined kaolin, 6.3 parts of alumina powder, 5.5 parts of calcite, 25 parts of wollastonite, 2 parts of zinc oxide, 3.2 parts of talc powder, and 7.4 parts of zirconium silicate. The solid raw material components are added to water, the weight ratio of the high-alumina stone ball to the slurry is 1.9:1, the filling rate is 0.36, the ball-milling is performed until the weight content of the raw material components having a particle size of not more than 10 μm and not more than 0.1% on a 325 mesh sieve is 70%, and then filtration is performed to obtain a glaze slurry composition, and the relative specific gravity is measured to be 1.404.

[0043] Example 6

[0044] In Example 5, after the solid raw material components are added to water, 0.14 parts of silicone resin microspheres having an average particle size of 3 μm are added, and then ball-milling is performed. The remaining steps remain unchanged.

[0045] Example 7

[0046] In Example 6, the silicone resin microspheres are changed from 0.14 parts to 0.29 parts. The remaining steps remain unchanged.

[0047] Example 8

[0048] In Example 6, the silicone resin microspheres are changed from 0.14 parts to 0.52 parts. The remaining steps remain unchanged.

[0049] Comparative Example 1

[0050] In Example 1, the spodumene is not added. The remaining steps remain unchanged.

[0051] Comparative Example 2

[0052] In Example 4, the silicone resin microspheres were replaced with equal weight of spherical silica with an average particle size of 2.5 μm, and the remaining steps were kept unchanged.

[0053] The thin slab body was prepared according to the following formula: 6.4 parts of potassium feldspar, 5.1 parts of quartz powder, 3.2 parts of calcined talc, 48.7 parts of alumina, 1.1 parts of dolomite, and water was ball milled to less than 1% on a 325 mesh sieve, and then according to 25.2 parts of white clay, 8.6 parts of black clay, and 4.4 parts of uncalcined kaolin, the slurry was prepared, the slurry specific gravity was 1.837, the flow rate was adjusted to 52 seconds, the iron was removed by sieving, and the slurry was adjusted after aging for 7 days. The slurry was made into a thin slab body with a size of 40 cm x 40 cm x (1.5 ± 0.1) mm, dried, and fired at a high temperature of 650°C for 5 hours to obtain a green body. The green body was sprayed with the glaze compositions of Examples 1-8 and Comparative Examples 1-2, respectively, with a wet glaze thickness of 0.4 mm, and then dried at a temperature of 55°C and a humidity of 20% or less for 4 hours. The temperature was then increased to 1250°C at a rate of 10°C / min and fired for 2 hours, and then naturally cooled to room temperature to obtain a thin plate.

[0054] Water absorption: The thin plate was placed in an oven at 80°C for 4 hours, cooled, weighed, soaked in clean water for 72 hours, taken out, surface water removed, weighed, and the water absorption was measured. Water absorption = (W1-W0) / W0 x 100%, where W1 is the weight of the thin plate after water absorption test, and W0 is the weight of the thin plate after baking before water absorption test. Test in triplicate and take the average value.

[0055] Glossiness test: According to the provisions of the national standard GB / T 3295-1996 "Ceramic products 45° mirror glossiness test method", the glossiness meter was used for testing. Test in triplicate and take the average value.

[0056] Cracking: 20 thin plates were randomly selected for each glaze composition, and the number of cracks on the thin plate and the number of thin plates without cracks were counted.

[0057] The results are shown in Table 1 below.

[0058] Table 1 Test Results

[0059]

[0060]

[0061] From the data in Table 1 above, it can be seen that the glaze composition of the present application has fewer pinholes, better water absorption, better glossiness, and fewer cracks after the thin plate is fired.

[0062] The embodiments are only illustrative of the present application, and are not intended to limit the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A slip composition suitable for use in thin edge pots, characterized in that, The solid raw material components of the enamel composition include, by weight fraction, 15-30 parts of potassium feldspar, 3-10 parts of spodumene, 20-30 parts of quartz powder, 5-16 parts of kaolin, 1-8 parts of alumina powder, 2-7 parts of calcite, 20-28 parts of wollastonite, 0.5-3 parts of zinc oxide, 1-5 parts of talc powder, and 5-11 parts of zirconium silicate. The spodumene accounts for 3-10% of the solid raw material components by weight percentage; The kaolin is composed of uncalcined kaolin and calcined kaolin at a weight ratio of 1:1-3; The spodumene, calcite, zinc oxide, and talc powder are pretreated by mixing the spodumene, calcite, zinc oxide, and talc powder, grinding to no more than 100 mesh, calcining at 1100-1200°C for 0.5-2 hours, cooling, and grinding to no more than 100 mesh; The oxygen volume percentage in the calcination atmosphere is no more than 10%, and the inert gas volume percentage is no less than 85%. The specific procedure for heating is as follows: 1-3 hours from room temperature to 600-700°C, constant temperature for 0.5-2 hours, continue to heat for 1-2 hours to 1100-1200°C, constant temperature calcination for 0.5-2 hours.

2. A method of preparing the slip composition for use in the thin edge pot according to claim 1, characterized by, Including: After mixing the solid raw material components and adding water, ball milling to a 325 mesh residue of no more than 0.1%, and the weight content of raw material components with a particle size of less than 10μm is 65-78%, and the product is obtained.

3. The method for preparing a slip composition suitable for thin edge pots according to claim 2, characterized in that, After mixing the solid raw material components and adding water, before ball milling, it also includes adding 0.1-0.5% of silicone resin microspheres to the weight of the solid raw material components.

4. The method for preparing the slip composition suitable for the thin edge pot according to claim 3, characterized in that, The average particle size of the silicone resin microspheres is 0.1-10μm.

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