A method for preparing enamel slurry and enamel plate

Abstract

The invention discloses an enamel slurry, which comprises the following substances in parts by weight: 100 parts of basic glaze; 3 to 8 parts of suspending agent; 4 to 20 parts of whiskers; 0.1 to 0.5 parts of auxiliary agent; and 40 to 60 parts of water. The invention also discloses a method for preparing an enamel plate, which comprises the following steps: applying the enamel slurry to a substrate by dipping or wet spraying, drying, and firing to obtain a whisker-toughened enamel plate. The invention utilizes whiskers to toughen while improving the construction performance of the glaze, and the Vickers hardness and fracture toughness of the enamel plate obtained by the invention are improved.

Description

Technical Field

[0001] The invention relates to the technical field of enamel glaze and enamel plate, in particular to a preparation method of enamel glaze slurry and enamel plate. Background Art

[0002] Enamel technology gives steel plates many properties such as corrosion resistance, weather resistance and decorative properties. At the same time, due to the brittleness of the enamel layer itself, small cracks that are not easily detected will appear when encountering certain impacts during transportation, installation and use. In addition, due to the poor fracture toughness of the enamel layer, small cracks will continue to develop and form large cracks, thus affecting the decorativeness and performance of the enamel plate. Summary of the invention

[0003] The purpose of the present invention is to provide an enamel glaze slurry, which utilizes whiskers to increase toughness and improve the construction performance of the glaze.

[0004] In order to solve this technical problem, the technical solution of the present invention is: an enamel slurry, comprising the following substances in parts by weight:

[0005] 100 parts of basic glaze;

[0006] 3 to 8 parts of suspending agent;

[0007] Whiskers 4 to 20 parts;

[0008] 0.1 to 0.5 parts of additives;

[0009] 40 to 60 parts water;

[0010] Appropriate amount of pigment.

[0011] Preferably, the base glaze is titanium glaze.

[0012] Preferably, the basic glaze comprises the following substances in terms of mass percentage:

[0013] B2O3 10.0~20.0 parts; Li2O 0.50~1.50 parts; Na2O 10.0~15.0 parts;

[0014] MgO 0.50-1.50 parts; Al2O3 1.00-3.00 parts; SiO2 30.0-40.0 parts;

[0015] P2O5 1.00~3.00 parts; K2O 2.00~4.00 parts; BaO 3.00~5.00 parts;

[0016] CaO 0.50~2.00 parts; TiO2 10.0~15.0 parts.

[0017] Preferably, the suspending agent is clay, the main component of which is aluminosilicate, and its purpose is to prevent the precipitation of particles in the glaze slurry, improve the strength of the powder blank, and ensure that the porcelain surface of the enamel plate is smooth and delicate.

[0018] It is further preferred that the whisker material is mullite whisker. Mullite is a general term for a series of minerals composed of aluminum silicates, and has a similar chemical composition to the suspending agent used in enamel glazes, so mullite whiskers have good compatibility with enamel glaze systems.

[0019] Preferably, the auxiliary agent is one or more of potassium fluorosilicate, potassium chloride and potassium carbonate. In the present invention, the auxiliary agent adjusts the viscosity of the glaze slurry, makes the glaze slurry easier to spray, and ensures the workability of the obtained glaze slurry.

[0020] Another object of the present invention is to provide a method for preparing an enamel plate. The present invention improves the Vickers hardness and fracture toughness of the obtained enamel plate by combining whiskers with various components.

[0021] To solve this technical problem, the technical solution of the present invention is: a method for preparing an enamel plate, comprising the following steps:

[0022] The enamel slurry of the present invention is sprayed on a 1.5 mm enamel substrate by dipping or wet spraying, dried, and fired to obtain a whisker-toughened enamel plate.

[0023] The preferred spraying thickness is 100-300 μm. The distance between the spray gun and the plate embryo is 15-25 cm; the moving speed of the spray gun is 2-5 cm / s; the angle between the gun nozzle and the plate embryo is 80°-100°. The spraying thickness mainly affects the impact resistance of the enamel plate. Generally, the impact resistance of the porcelain layer will decrease as the thickness increases. The enamel plate obtained by the present invention has good wear resistance. For white or gray enamel plates, the spraying thickness is generally thin, about 100 μm to 140 μm. However, for other colored enamel plates, spraying too thin will make the color appear obviously uneven, so the method of spraying twice is often adopted to make the color presented fuller, and the thickness reaches 200-300 μm. If the spray gun is too close to the plate, the surface of the fired plate will appear orange peel wrinkles, and if it is too far away, the porcelain layer will be too thin and the glaze powder will be wasted. The present invention effectively combines the composition of the glaze to determine the spraying process and ensure a good porcelain surface effect. In addition, if polishing and other measures are required later, spraying twice will also be adopted. The test sample of the present invention needs to be polished before the fracture toughness test, so the sample is produced by spraying twice.

[0024] Preferably, the drying temperature is 110° C. to 130° C., and the drying time is 3 min to 5 min.

[0025] Preferably, the firing temperature is 790° C. to 840° C., and the firing time is 3.5 min to 4.5 min.

[0026] The particles in the enamel slurry are preferably ground to a coarseness of 0.05g to 0.20g and a bulk density of 1.53g / ml to 1.86g / ml; the glaze obtained by the present invention ensures thixotropy during the construction process by controlling the grinding and is easy to spray; the glaze slurry has good suspension, a fine porcelain surface, a stable structure, and is combined with whiskers to improve the overall toughness and hardness, while being acid and alkali resistant.

[0027] By adopting the above technical solution, the beneficial effects of the present invention are:

[0028] The present invention adds whisker materials to the glaze formula and combines it with the preparation method of the present invention to obtain a new type of enamel decorative plate with high toughness, which meets the requirements of technical regulations and maintains the inherent characteristics and advantages of ordinary enamel decorative plates. The present invention combines whisker materials with enamel decorative plates, which has a major breakthrough in improving the fracture toughness of enamel plates.

[0029] The invention relates to an enamel material for steel plates. The enamel material is based on the whisker toughening principle and utilizes the crack bridging, crack deflection and pull-out effects of whiskers to make the generated cracks encounter sufficient resistance during the propagation process, thereby preventing the cracks from developing too quickly. After high-temperature calcination, the enamel material can give the enamel a higher fracture toughness, slow down the expansion speed of cracks on the enamel surface, and increase the service life of the enamel.

[0030] Thereby achieving the above-mentioned purpose of the present invention. DETAILED DESCRIPTION

[0031] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0032] Example 1

[0033] The composition of the enamel glaze slurry of this embodiment, the proportion of each component of the basic titanium glaze, and the coarseness and bulk density of the glaze slurry are shown in Table 1.

[0034] The method for preparing the enamel slurry in this embodiment comprises the following steps: (1) accurately weighing the components of the glaze slurry listed in Table 1 and Table 2 using an electronic balance with an accuracy of 0.01 g and then putting them into a ball mill; (2) ball milling at a rotation speed of 1000 r / min for 16 minutes.

[0035] The preparation method of the enamel plate of this embodiment is: the glaze slurry is applied to the substrate by dipping or wet spraying, and the enamel plate is obtained after drying and firing. The manufacturing process parameters of the enamel plate of this embodiment are shown in Table 3 and Table 4.

[0036] Example 2

[0037] The main differences between this embodiment and embodiment 1 are shown in Table 1 and Table 2.

[0038] Example 3

[0039] The main differences between this embodiment and embodiment 1 are shown in Table 1 and Table 2.

[0040] Comparative Example

[0041] This comparative example uses enamel slurry without mullite whiskers as the test slurry. The main differences from Example 1 are shown in Tables 1 to 4.

[0042] The properties of the enameled panels obtained in Examples 1 to 3 and the enameled panels of the comparative example are shown in Table 5. The present invention adds whisker materials to the glaze formula and combines it with the preparation method of the present invention to obtain a new type of enamel decorative plate with high toughness, which meets the requirements of technical regulations and maintains the inherent characteristics and advantages of ordinary enamel decorative plates. The present invention combines whisker materials with enamel decorative plates, which has a major breakthrough in improving the fracture toughness of enamel plates.

[0043] The enamel glaze slurry of the present invention is based on the whisker toughening principle, and utilizes the crack bridging, crack deflection and pull-out effects of the whiskers to make the generated cracks encounter sufficient resistance during the propagation process, thereby preventing the cracks from developing too quickly; after high-temperature calcination, the glaze can give the enamel a higher fracture toughness, slow down the expansion speed of the cracks on the enamel surface, and increase the service life of the enamel. At the same time, the chemical composition of mullite and the suspending agent is similar, so the mullite whisker has good compatibility with the enamel glaze system, the obtained glaze has good construction performance, and the Vickers hardness and fracture toughness of the obtained enamel plate are improved.

Claims

1. An enamel slurry, characterized in that: The following materials are included in parts by weight: 100 parts of basic glaze; 3 parts of suspension concentrate; Whiskers 4 to 20 parts; 0.1 to 0.5 parts of additives; 40 to 60 parts water; The basic glaze is titanium glaze; The basic glaze comprises the following substances in parts by mass: B2O3 10.0~20.0 parts; Li2O 0.50~1.50 parts; Na2O 10.0~15.0 parts; MgO 0.50-1.50 parts; Al2O3 1.00-3.00 parts; SiO2 30.0-40.0 parts; P2O5 1.00~3.00 parts; K2O 2.00~4.00 parts; BaO 3.00~5.00 parts; CaO 0.50-2.00 parts; TiO2 10.0-15.0 parts; The whisker material is mullite whisker; The suspending agent is clay; The auxiliary agent is one or more of potassium fluorosilicate, potassium chloride and potassium carbonate.

2. A method for preparing an enamel plate, characterized in that: The following steps are involved: The enamel slurry described in claim 1 is applied to a 1.5 mm enamel substrate by dipping or wet spraying, dried, and fired to obtain a whisker-toughened enamel plate.

3. The preparation method according to claim 2, characterized in that: The coating thickness is 100-300 μm; the distance between the spray gun and the plate blank is 15-25 cm; the moving speed of the spray gun is 2-5 cm / s; and the angle between the gun nozzle and the plate blank is 80° to 100°.

4. The preparation method according to claim 3, characterized in that: The drying temperature is 110°C to 130°C, and the drying time is 3min to 5min.

5. The preparation method according to claim 3, characterized in that: The firing temperature is 790°C to 840°C, and the firing time is 3.5 min to 4.5 min.

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