Regenerated enamel glaze as well as preparation method and application thereof

Abstract

The invention relates to the technical field of enamel products, and provides regenerated enamel glaze as well as a preparation method and application thereof. The regenerated enamel glaze comprises enamel waste powder, a suspending agent and a cosolvent, and by taking the mass of the enamel waste powder as a reference, the addition amount of the suspending agent is 5-12%, and the addition amount of the cosolvent is 0.1-3%; the enamel waste powder is generated in an enamel glaze spraying operation process. According to the regenerated enamel glaze, the enamel waste powder is fully utilized, the solid waste treatment cost and the product manufacturing cost are reduced, and the environment is protected. The regenerated enamel glaze provided by the invention can be used for manufacturing enamel products with the acid-resistant standard of A + level, such as inner containers and baking trays of ovens, cooker panels, liquid bearing trays, barbecue oven accessories and the like.

Description

Technical Field

[0001] The invention relates to the technical field of enamel products, and in particular to a regenerated enamel glaze and a preparation method and application thereof. Background Art

[0002] Usually, the black glossy enamel liquid tray, black panel, beige panel and white panel of kitchen appliances such as gas stoves and range hoods are all painted by manual wet spraying.

[0003] During the spraying process, about 30% of enamel waste powder will be generated, forming solid waste. This part of enamel waste powder has complex components and contains multiple colors. It is generally discarded in this field, so it is necessary to ask a professional solid waste treatment company to treat it. The cost is generally as high as 7,000 yuan / ton, which increases the manufacturing cost, and the solid waste after treatment will still burden the environment. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a regenerated enamel glaze, which makes full use of enamel waste powder, reduces costs and is environmentally friendly.

[0005] The invention also provides a method for preparing the regenerated enamel glaze.

[0006] The invention also provides an application of the regenerated enamel glaze.

[0007] In the first aspect, the present invention provides a regenerated enamel glaze, including enamel waste powder, a suspending agent and a solubility aid. Based on the mass of the enamel waste powder, the added amount of the suspending agent is 5-12%, and the added amount of the solubility aid is 0.1-3%; the enamel waste powder is generated during the enamel glaze spraying operation.

[0008] According to the regenerated enamel provided by the present invention, the suspending agent is selected from one or more of kaolin and bentonite.

[0009] According to the regenerated enamel glaze provided by the present invention, the co-solvent is selected from one or more of anhydrous borax and sodium nitrite.

[0010] According to the regenerated enamel glaze provided by the present invention, the regenerated enamel glaze comprises the following components, measured in parts by weight: 100 parts of enamel waste powder, 5-10 parts of kaolin, 0.3-0.5 parts of anhydrous borax, 0.3-0.5 parts of sodium nitrite and 0.3-0.5 parts of bentonite.

[0011] According to the regenerated enamel glaze provided by the present invention, the slurry concentration of the regenerated enamel glaze is 170-180g / 100ml, and the 200-mesh sieve residue of the regenerated enamel glaze is 5-10g / 100ml.

[0012] In a second aspect, the present invention provides a method for preparing the above-mentioned regenerated enamel glaze.

[0013] The preparation method provided by the invention comprises the steps of mixing the components of the regenerated enamel glaze and performing wet ball milling.

[0014] According to the preparation method of the regenerated enamel glaze provided by the present invention, in the wet ball milling step, the slurry concentration is 170-180g / 100ml, the slurry accounts for 50%-70% of the total load of the ball mill, and the rotation speed is 25-35 rpm; Preferably, the mass ratio of large balls: small balls: medium balls during ball milling is 1:1:2.

[0015] In a third aspect, the present invention provides an enameled accessory, comprising a substrate and an enamel layer disposed on the substrate, wherein the raw materials for preparing the enamel layer include the above-mentioned regenerated enamel glaze.

[0016] According to the enamel accessories provided by the present invention, the preparation of the enamel accessories includes: spraying the regenerated enamel glaze on a substrate with a spraying thickness of 100-180 microns, and firing at 835-855° C. for 3.5-5.5 minutes.

[0017] According to the enamel fittings provided by the present invention, the enamel layer reaches the A+ grade acid resistance standard and the adhesion is ≥ grade 3.

[0018] In a fourth aspect, the present invention provides a kitchen utensil comprising the above-mentioned enamel accessories.

[0019] Preferably, the kitchen utensil is an oven, a gas stove, a range hood or a barbecue oven. The kitchen utensil also includes various daily tableware, such as cups, plates, bowls, dishes, basins, etc.

[0020] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: The regenerated enamel glaze of the invention makes full use of the waste enamel powder, reduces solid waste and manufacturing costs, and protects the environment.

[0021] Furthermore, the regenerated enamel glaze provided by the present invention can be used to manufacture acid-resistant standard A+ grade enamel products, such as oven inner tanks and baking trays, stove panels, liquid receiving trays, barbecue oven accessories, etc., which have a grayish-white appearance and have a better effect than the existing enamel glaze.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the standard diagram for judging adhesion levels 1 to 5; Figure 2 This is a rendering of the good appearance, acid resistance and adhesion of the enamel layer in the embodiment of the present invention; Figure 3 This is a rendering of the enamel layer in Comparative Example 2 of the present invention. DETAILED DESCRIPTION

[0024] The following examples are used to illustrate the present invention, but they are not intended to limit the scope of the present invention.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0026] In the first aspect, the present invention provides a regenerated enamel glaze, including enamel waste powder, a suspending agent and a solubility aid. Based on the mass of the enamel waste powder, the added amount of the suspending agent is 5-12%, and the added amount of the solubility aid is 0.1-3%; the enamel waste powder is generated during the enamel glaze spraying operation.

[0027] During the enamel powder spraying operation, about 30% of enamel waste powder will be generated. Due to the complex composition and multiple colors of enamel waste powder, technical personnel in this field have always believed that it cannot be used at all, so it is discarded and treated as solid waste, which increases manufacturing costs and harms the environment.

[0028] The present invention unexpectedly found that during the spraying process, the enamel powder mainly loses auxiliary agents such as cosolvents and suspending agents. The composition of the enamel waste powder is very close to that of enamel glaze. Although it contains multiple colors, it is mixed and ground again with auxiliary agents such as suspending agents and cosolvents, and various color substances can be dispersed and balanced again, so that the whole shows grayish white spots, which can be used for oven inner tanks, baking trays, etc., and its acid resistance can reach A+ level or even higher. The effect is equivalent to the grayish white spot glaze obtained by mixing commercially available enamel glaze in the prior art, and the cost is lower.

[0029] It should be noted that enamel glaze is a glassy substance composed of alkali-borosilicate system used for coating on metal blanks. After coating enamel glaze on metal blanks, it can be firmly bonded with the blanks after firing, and has a protective and decorative effect on the blanks. The basic components of enamel glaze are the following 5 kinds: ① Matrix agent: It accounts for 40~60% of the total amount of porcelain glaze and is the component that determines the main properties of enamel glaze. It includes silicon oxide, zirconium oxide, titanium oxide, etc.

[0030] ② Flux: Promotes the melting of enamel glaze and improves its processing performance and physical and chemical properties. It includes sodium oxide, potassium oxide and boron oxide.

[0031] ③Emulsifier: gives the green body good covering ability.

[0032] ④ Adhesive: It makes the porcelain glaze firmly bond with the body.

[0033] ⑤ Colorant: An ingredient that gives enamel glaze various colors to achieve decorative effects.

[0034] In addition, the acid resistance of enamel products is one of the most important properties. For daily enamelware or other kitchen utensils involving enamel layers, because they sometimes come into contact with organic acids (acetic acid, citric acid, lactic acid, etc.), the enamel layer must have good organic acid resistance.

[0035] The following are the citric acid resistance test methods and criteria for enamel products: 1. Preparation of materials: 1. Citric acid solution concentration 10%; 2. Glass or polyethylene lid with an outer diameter of about 30mm; 3. Filter paper with a diameter of about 30 mm; 4. Pencil: hardness is HB.

[0036] (II) Test methods: 1. Use a pipette to drop 2-4 drops of citric acid on each enameled steel plate, cover it immediately with a lid, and place it at 20-26°C for 15 minutes; 2. If the sample to be tested has a curved surface, place two pieces of filter paper on the sample, then drop 2 to 4 drops of citric acid on the filter paper, cover it immediately with a lid, and place it at 20 to 26°C for 15 minutes; 3. Remove the lid and filter paper, rinse with water, and then dry with a clean cotton towel.

[0037] (III) Determination level: 1. (Level 1) AA: There is no difference between the acid-treated area and the untreated area; 2. (Level 2) Grade A: There is a difference, but the acid-treated area has no gloss loss. Use a pencil to draw parallel lines in the two areas, and both can be wiped clean with a dry towel; 3. (Level 3) Level B: There is a difference, but the acid-treated area has no gloss loss. Draw parallel lines between the two areas with a pencil. It cannot be wiped clean with a dry towel, but can be wiped clean with a wet towel. 4. Unable to be graded: The acid-treated area loses its gloss and cannot be wiped clean even with a wet towel.

[0038] It can be understood that if the measurement result is between grade A and grade AA, it can be judged as grade A+, and the same applies to other grades.

[0039] In the present invention, the enamel glaze from which the enamel waste powder is produced needs to reach the acid resistance level of AA, so that the regenerated enamel glaze obtained by using the enamel waste powder can meet the acid resistance level of A+ or above.

[0040] In some embodiments of the present invention, the suspending agent is selected from one or more of kaolin and bentonite.

[0041] It can be understood that the role of the suspending agent is to improve the dispersion uniformity of the slurry, prevent the precipitation of enamel particles, help to coat the enamel evenly, and enhance the strength of the dry powder layer.

[0042] In some embodiments of the present invention, the auxiliary solvent is selected from one or more of anhydrous borax and sodium nitrite. The auxiliary solvent is used to help reduce the firing temperature of the enamel and increase fluidity.

[0043] In some embodiments of the present invention, the regenerated enamel glaze comprises the following components, measured in parts by weight: 100 parts of enamel waste powder, 5-10 parts of kaolin, 0.3-0.5 parts of anhydrous borax, 0.3-0.5 parts of sodium nitrite and 0.3-0.5 parts of bentonite.

[0044] Kaolin: Kaolin is a non-metallic mineral, a clay and clay rock mainly composed of kaolinite clay minerals. It is white in appearance and fine in texture. Its mineral components are mainly composed of kaolinite, halloysite, hydromica, illite, montmorillonite, quartz, feldspar and other minerals. Its chemical composition is 2SiO2·Al2O3·2H2O. Its crystal form belongs to 1:1 type layered silicate. The crystal is mainly composed of silicon oxygen tetrahedron and aluminum hydroxide octahedron. The silicon oxygen tetrahedron is connected along the two-dimensional direction in a shared vertex to form a hexagonal grid layer. The unshared apex oxygen of each silicon oxygen tetrahedron faces one side; the apex oxygen of the silicon oxygen tetrahedron layer shared by the silicon oxygen tetrahedron layer and the aluminum hydroxide octahedron layer forms a 1:1 unit layer, which provides high suspension of enamel slurry, prevents the precipitation of enamel particles, and enhances the strength of the dry powder layer.

[0045] Anhydrous borax: an inorganic compound that is easy to combine with oxides in enamel glazes, and has a very low melting point, and is easy to fuse with iron billets, so it is an important neutral flux that can reduce the firing temperature of enamel and increase fluidity. At the same time, borax is easily soluble in water, and the enamel slurry loses a lot after flushing.

[0046] Sodium nitrite: an inorganic compound with the chemical formula NaNO2. It is a white crystalline powder that acts as an electrolyte in enamel, thickening the glaze slurry and having good retention properties without causing rapid precipitation of particles in the slurry. It is also easily soluble in water and is easily lost with water after the enamel slurry is flushed.

[0047] Bentonite: A type of clay rock, also known as montmorillonite clay rock, often contains a small amount of illite, kaolinite, halloysite, chlorite, zeolite, quartz, feldspar, calcite, etc. The main chemical components are silicon dioxide, aluminum oxide and water, and also contain elements such as iron, magnesium, calcium, sodium, potassium, etc. It has a 2:1 crystal structure consisting of two silicon-oxygen tetrahedra sandwiched by a layer of aluminum-oxygen octahedrons. The crystals are in a layered structure, which can expand when absorbing water to form micelles, improve slurry-making properties, and improve the suspension of slurry.

[0048] Under the above-mentioned formulation conditions, the obtained regenerated enamel glaze is a grayish-white dot enamel glaze, which is firmly bonded to the substrate (metal) after coating, is evenly distributed, and has an acid resistance that can reach A+ level.

[0049] It is understood that the regenerated enamel glaze of the present invention also includes water. The slurry concentration of the regenerated enamel glaze is 170-180 g / 100 ml, and the 200 mesh sieve residue of the regenerated enamel glaze is 5-10 g / 100 ml.

[0050] Among them, controlling the 200 mesh sieve residue of the regenerated enamel glaze to 5-10g / 100ml is helpful to obtain an enamel surface with better appearance. The slurry concentration of the regenerated enamel glaze is controlled at 170-180g / 100ml to better cooperate with the subsequent enamel coating. It can be understood by those skilled in the art that in order to meet the needs of some customers, the regenerated enamel glaze can also be made into the form of enamel powder.

[0051] In a second aspect, the present invention provides a method for preparing the above-mentioned regenerated enamel glaze, comprising the step of mixing the components of the regenerated enamel glaze and performing wet ball milling.

[0052] In some embodiments of the present invention, in the wet ball milling step, the slurry concentration is 170-180 g / 100 ml, the slurry accounts for 50%-70% of the total load of the ball mill, and the rotation speed is 25-35 rpm. Further preferably, the mass ratio of large ball: small ball: medium ball during the ball milling process is 1:1:2.

[0053] It should be noted that the slurry concentration of 170-180g / 100ml means that 100ml of slurry contains 66-71g of solid powder, the rest is water, and the total weight of 100ml of slurry is 170-180g. During the ball milling process, the mass ratio of large ball: small ball: medium ball is 1:1:2, which helps to obtain the slurry with the target particle size by ball milling.

[0054] In some embodiments of the present invention, the process for preparing the above-mentioned regenerated enamel glaze is: add enamel waste powder according to the formula - add auxiliary materials - add water - grind - test - grind out - filter - store / age - wait for use.

[0055] In a third aspect, the present invention provides an enameled accessory, comprising a substrate and an enamel layer disposed on the substrate, wherein the raw materials for preparing the enamel layer include the above-mentioned regenerated enamel glaze.

[0056] The substrate of the present invention is a metal steel plate. The specific regenerated enamel glaze of the present invention is for the substrate steel plate. The effect of the present invention cannot be achieved by combining it with other substrates.

[0057] In some embodiments of the present invention, the preparation of the enamel accessories includes: spraying the regenerated enamel glaze on a substrate with a spraying thickness of 100-180 microns, and firing at 820-850° C. for 2.5-3.5 minutes.

[0058] The spraying can be carried out by pressure tank spraying, and the pressure is preferably controlled at 5.5-6.5 MPa.

[0059] By adopting the above formula and method, the enamel fittings provided by the present invention can have an enamel layer that meets the A+ acid resistance standard, that is, between the A and AA acid resistance standards, and has an adhesion of ≥3 levels.

[0060] The present invention can make full use of enamel waste powder, which is beyond expectations, reduces costs, and alleviates environmental burden. It can further prepare gray-white spot enamel porcelain surfaces with A+ grade acid-resistant standards, which can be applied to most usage scenarios. It has better effects than the existing method of glaze slurry preparation, and has made a huge contribution to the field of enamel products.

[0061] In a fourth aspect, the present invention provides a kitchen utensil comprising the above-mentioned enamel accessories.

[0062] In some embodiments of the present invention, the kitchen appliance is a gas stove. Further, its panel is an enamel accessory.

[0063] In some embodiments of the present invention, the kitchen appliance is a range hood. Further, the liquid receiving tray is an enamel accessory.

[0064] In some embodiments of the present invention, the kitchen utensil is an oven, and further, its inner pot and / or baking tray are enamel accessories.

[0065] In some embodiments of the present invention, the kitchen utensil is a barbecue grill, and some of its accessories are enamel accessories.

[0066] Specific embodiments will be described below.

[0067] In the following examples, unless otherwise specified, all materials used can be obtained through regular commercial channels.

[0068] In the following examples, the kaolin used is black kaolin produced by China Kaolin Company, and the enamel waste powder used is generated during the spraying operation of enamel glaze (acid resistance reaches AA grade, and the enamel glaze color is one or more of black gloss, black matte, kitchen white, and beige).

[0069] In the following examples, the acid resistance test method and determination are as described in the Summary of the Invention section.

[0070] The adhesion test method is: use an enamel impact instrument to test the adhesion of enamel parts. The test parameters are: H (height) = 600mm, W (weight) = 2LB; the testing instrument is an enamel impact instrument; the judgment standard is: after the test, the porcelain surface at the positive impact point is damaged into a silk screen, and the proportion of the base material exposed is observed. The specific 1 to 5 levels are as follows: Figure 1 As shown, level 5 is the best, with no substrate exposed, and level 3 means that the proportion of substrate exposed is less than two-thirds of the test point area.

[0071] The appearance inspection method must meet one of the following light source conditions: 1. "Standard light source D65 (color temperature 6500K)" 2. Incandescent lamp "A", 3. Fluorescent "TL84".

[0072] The criteria for judging good appearance are: the sample surface color is uniform, the gray and white spots are evenly distributed, the coating is firm, and there are no obvious flow marks, cracks, porcelain cracks and other defects on the surface. Specifically, there are no cracks, cracks, wrinkles, powder accumulation, long strip defects (including: welding marks, long shrinkage marks, air marks, color marks, silver marks, top white / top convex, burrs, orange peel marks, etc.); shrinkage holes and pits are not allowed on the front side, and the bottom surface is ≤Φ0.5mm2≤2 (the distance between bad spots should be greater than 300mm). If any of the conditions is not met, it is judged as poor appearance. Example 1

[0073] The present embodiment provides a regenerated enamel glaze, which is composed of the following components in parts by weight: 100 parts of enamel waste powder, 5 parts of kaolin, 0.3 parts of anhydrous borax, 0.3 parts of sodium nitrite and 0.3 parts of bentonite.

[0074] This embodiment also provides a method for preparing the above-mentioned regenerated enamel glaze, which is specifically as follows: The components of the above-mentioned enamel glaze are mixed and wet-milled, wherein the slurry concentration is 170g / 100ml, the slurry accounts for 50% of the total load of the ball mill, the rotation speed is 25 rpm, and the mass ratio of large ball: small ball: medium ball during the ball milling process is 1:1:2. Example 2

[0075] The present embodiment provides a regenerated enamel glaze, which is composed of the following components in parts by weight: 100 parts of enamel waste powder, 8 parts of kaolin, 0.4 parts of anhydrous borax, 0.4 parts of sodium nitrite and 0.4 parts of bentonite.

[0076] This embodiment also provides a method for preparing the above-mentioned regenerated enamel glaze, which is specifically as follows: The components of the above-mentioned regenerated enamel glaze are mixed and wet-milled, wherein the slurry concentration is 175g / 100ml, the slurry accounts for 60% of the total load of the ball mill, the rotation speed is 30 rpm, and the mass ratio of large ball: small ball: medium ball during the ball milling process is 1:1:2. Example 3

[0077] The present embodiment provides a regenerated enamel glaze, which is composed of the following components in parts by weight: 100 parts of enamel waste powder, 10 parts of kaolin, 0.5 parts of anhydrous borax, 0.5 parts of sodium nitrite and 0.5 parts of bentonite.

[0078] This embodiment also provides a method for preparing the above-mentioned regenerated enamel glaze, which is specifically as follows: The components of the above-mentioned regenerated enamel glaze are mixed and wet-milled, wherein the slurry concentration is 180g / 100ml, the slurry accounts for 70% of the total load of the ball mill, the rotation speed is 35 rpm, and the mass ratio of large ball: small ball: medium ball during the ball milling process is 1:1:2. Example 4

[0079] This embodiment provides an oven inner container, comprising a metal steel plate and an enamel layer disposed on the metal steel plate, wherein the enamel layer is prepared from the regenerated enamel glaze obtained in Example 1, and the specific steps are as follows: The regenerated enamel glaze obtained in Example 1 was sprayed using a pressure tank with a spraying thickness of 180 μm, a firing temperature of 850° C., and a firing time of 3.5 min.

[0080] After firing, the enamel layer has a good appearance, the adhesion is ≥ level 3 and can reach the A+ level acid resistance standard. The effect is shown in the figure Figure 2 shown. Example 5

[0081] This embodiment provides a gas stove panel, including a metal steel plate and an enamel layer arranged on the metal steel plate, wherein the enamel layer is prepared from the regenerated enamel glaze obtained in Example 2, and the specific steps are as follows: The regenerated enamel obtained in Example 2 was sprayed using a pressure tank with a spraying thickness of 100 μm, a firing temperature of 835° C., and a firing time of 5.5 min.

[0082] After firing, the enamel layer has a good appearance, adhesion ≥ level 3 and can reach A+ acid resistance standard. Example 6

[0083] This embodiment provides a liquid receiving tray of a range hood, comprising a metal steel plate and an enamel layer arranged on the metal steel plate, wherein the enamel layer is prepared from the regenerated enamel glaze obtained in Example 3, and the specific steps are as follows: The regenerated enamel glaze obtained in Example 3 was sprayed using a pressure tank with a spraying thickness of 100 μm, a firing temperature of 845° C., and a firing time of 4 min.

[0084] After firing, the enamel layer has a good appearance, adhesion ≥ level 3 and can reach A+ acid resistance standard. Comparative Example 1

[0085] This comparative example provides a grayish white enamel glaze, which is mixed with 85 parts by weight of SGC3366 (purchased from Hunan Xinnuo Technology Co., Ltd.) and 15 parts by weight of titanium dioxide glaze.

[0086] The above-mentioned enamel glaze is used to prepare an oven liner, and the preparation method is the same as that of Example 4.

[0087] After firing, the enamel layer has a good appearance, adhesion ≥ level 3 and can reach A+ acid resistance standard. Comparative Example 2

[0088] This comparative example provides a regenerated enamel powder. The enamel waste powder is directly sieved and used. The firing conditions are the same as those in Example 4. As a result, the enamel surface has particles / pits, dullness, orange peel, unqualified adhesion, and uneven distribution of different color points. Figure 3 shown. Comparative Example 3

[0089] This comparative example provides a regenerated enamel glaze, which is composed of the following components in parts by weight: 100 parts of enamel waste powder, 3 parts of kaolin, 0.3 parts of anhydrous borax, 0.3 parts of sodium nitrite and 0.3 parts of bentonite. As a result, the glaze slurry precipitates quickly and cannot be used normally. Comparative Example 4

[0090] This comparative example provides an oven inner container, comprising a metal steel plate and an enamel layer disposed on the metal steel plate, wherein the enamel layer is prepared from the regenerated enamel glaze obtained in Example 1, and the specific steps are as follows: The regenerated enamel glaze obtained in Example 1 was sprayed using a pressure tank with a spraying thickness of 180 μm, a firing temperature of 815° C., and a firing time of 5 min.

[0091] After firing, the acid resistance level of the enamel layer is B level, and the adhesion does not reach level 3.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A regenerated enamel glaze, characterized in that: The invention comprises enamel waste powder, suspending agent and auxiliary solvent. Based on the mass of the enamel waste powder, the addition amount of the suspending agent is 5-12%, and the addition amount of the auxiliary solvent is 0.1-3%. The enamel waste powder is generated during the enamel glaze spraying operation.

2. The regenerated enamel glaze according to claim 1, characterized in that: The suspending agent is selected from one or more of kaolin and bentonite; The co-solvent is selected from one or more of anhydrous borax and sodium nitrite.

3. The regenerated enamel glaze according to claim 2, characterized in that: The regenerated enamel glaze comprises the following components in parts by weight: 100 parts of enamel waste powder, 5-10 parts of kaolin, 0.3-0.5 parts of anhydrous borax, 0.3-0.5 parts of sodium nitrite and 0.3-0.5 parts of bentonite.

4. The regenerated enamel according to any one of claims 1 to 3, characterized in that: The slurry concentration of the regenerated enamel glaze is 170-180 g / 100 ml, and the 200-mesh sieve residue of the regenerated enamel glaze is 5-10 g / 100 ml.

5. The method for preparing the regenerated enamel glaze according to any one of claims 1 to 4, characterized in that: The method comprises the steps of mixing various components of the regenerated enamel glaze and performing wet ball milling.

6. The method for preparing regenerated enamel according to claim 5, characterized in that: In the wet ball milling step, the slurry concentration is 170-180 g / 100 ml, the slurry accounts for 50%-70% of the total load of the ball mill, and the rotation speed is 25-35 rpm; Preferably, the mass ratio of large balls: small balls: medium balls during ball milling is 1:1:

2.

7. An enamel accessory, characterized in that: The invention comprises a substrate and an enamel layer arranged on the substrate, wherein the raw material for preparing the enamel layer comprises the regenerated enamel glaze according to any one of claims 1 to 4.

8. The enamel fitting according to claim 7, characterized in that: The preparation of the enamel accessories includes: spraying the regenerated enamel glaze on a substrate with a spraying thickness of 100-180 microns, and firing at 835-855° C. for 3.5-5.5 minutes.

9. The enamel fitting according to claim 8, characterized in that: The enamel layer reaches A+ grade acid resistance standard and has adhesion ≥ grade 3.

10. A kitchen appliance, characterized in that: The enamel fitting comprising any one of claims 7 to 9; Preferably, the kitchen appliance is an oven, a gas stove, a range hood or a barbecue grill.

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