A water-based anti-wrinkle coating composition for the foundry industry

Abstract

This invention relates to the field of casting coating technology, and provides a water-based anti-veining coating composition for the casting industry. Based on refractory aggregate, the composition comprises, by weight, 100 parts refractory aggregate, 3-15 parts sintering agent, 60-100 parts water, 1-10 parts suspending agent, 0.1-5 parts binder, 0.01-1 part wetting agent, 0.01-1 part corrosion inhibitor, 0.01-1 part defoamer, and 0.1-10 parts pigment. The refractory aggregate comprises refractory aggregate A, refractory aggregate B, and refractory aggregate C, with a weight ratio of 1:(0.3-1.5):(2-8). Refractory aggregate A is a heavy refractory aggregate, refractory aggregate B is a low thermal conductivity refractory aggregate, and refractory aggregate C is a refractory aggregate with a microscopic particle structure having a particle size-to-thickness ratio ≥10 and exhibiting a flake-like morphology. It effectively solves the casting vein defects existing in cold box casting process and 3D sand printing casting process, with good performance and low cost.

Description

Technical Field

[0001] This invention relates to the field of casting coating technology, and more specifically, to a water-based anti-veining coating composition for the casting industry. Background Technology

[0002] Due to the presence of silica sand phase transformation and the high compactness and low yielding of the core-shooting process, castings produced by this process exhibit very obvious vein defects in the internal cavities. Furthermore, in the practice of 3D sand printing casting, castings produced using silica sand also show a significant tendency towards vein defects. These veins often exist in difficult-to-clean internal cavities, causing considerable cleaning difficulties and increasing cleaning costs. The presence of internal dark veins leads to the scrapping of many castings with flow channels, such as water jackets. Currently available commercial anti-veining coatings do not meet the performance requirements of actual field applications. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by proposing a water-based anti-veining coating composition for the foundry industry, solving the casting vein defect in cold box casting and 3D sand printing casting processes. To achieve its objective, this invention provides the following technical solution:

[0004] A water-based anti-vein coating composition for the foundry industry, based on refractory aggregate by weight, comprises 100 parts refractory aggregate, 3-15 parts sintering agent, 60-100 parts water, 1-10 parts suspending agent, 0.1-5 parts binder, 0.01-1 part wetting agent, 0.01-1 part corrosion inhibitor, 0.01-1 part defoamer, and 0.1-10 parts pigment;

[0005] The refractory aggregate comprises refractory aggregate A, refractory aggregate B, and refractory aggregate C, wherein the weight ratio of refractory aggregate A, refractory aggregate B, and refractory aggregate C is 1:(0.3-1.5):(2-8). Refractory aggregate A is a heavy refractory aggregate, refractory aggregate B is a low thermal conductivity refractory aggregate, and refractory aggregate C is a refractory aggregate with a microstructure in which the aggregate particle diameter-to-thickness ratio is ≥10 and it exhibits a flake-like morphology.

[0006] In one embodiment, the sintering agent is potassium oxide, sodium oxide, sodium fluorosilicate, and glass powder.

[0007] In one embodiment, the particle size range of the refractory aggregate is 50-1250 mesh, wherein the particle size of refractory aggregate A is 300-1250 mesh; the particle size range of refractory aggregate B is 100-400 mesh; and the particle size of refractory aggregate C is 50-200 mesh.

[0008] In one embodiment, preferably, the particle size of refractory aggregate A is 800-1000 mesh, the particle size of refractory aggregate B is 200-325 mesh, and the particle size of refractory aggregate C is 100-140 mesh.

[0009] In one embodiment, refractory aggregate A has a perfectly spherical structure, with the spherical surface covered by a resin film. The resin used for the coating is thermoplastic phenolic resin. Refractory aggregate A is one or more of the following: zircon powder, fused white corundum powder, sintered white corundum, brown corundum, sub-white corundum, chrome corundum, chromium ore powder, and high-alumina bauxite (alumina content ≥90%). The bulk density of refractory aggregate A is 4.0 g / cm³. 3 The above has a fire resistance of over 1600℃.

[0010] In one embodiment, refractory aggregate B has a microporous structure; refractory aggregate B is one or more of asbestos powder, vermiculite powder, perlite powder, closed-cell hollow artificial spherical aggregate particles, microporous calcium silicate, microporous calcium aluminate, and microporous magnesium carbonate; the thermal conductivity of refractory aggregate B is 0.5 W / (m·K). -1 The Mohs hardness of the aggregate crystals is in the range of 1 to 3; the refractoriness of refractory aggregate B is 1000 to 1500℃.

[0011] In one embodiment, the aspect ratio of the microparticles of refractory aggregate C is greater than 10:1; refractory aggregate C is one or more of muscovite, sericite, lepidolite, talc, kaolin, and illite; and the refractoriness of refractory aggregate C is 1200-1600℃.

[0012] In one embodiment, the suspending agent includes one or more of attapulgite, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, guar gum, synthetic polyacrylic acid, and polyurethane.

[0013] In one embodiment, the binder includes one or more of dextrin, VAE emulsion, and polyvinyl acetate emulsion.

[0014] In one embodiment, the wetting agent includes one or more of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, acetylation glycol polyoxyethylene ether, and sorbitol laurate polyoxyethylene ether.

[0015] In one embodiment, the preservative is one or more of BIT, CIT / CMIT, and DBNPA.

[0016] In one embodiment, the defoamer is a silicone defoamer.

[0017] In one embodiment, the pigment is one or more of iron oxide yellow, iron oxide brown, and iron oxide black.

[0018] In one embodiment, flake graphite may be added to the refractory aggregate to ensure a high refractoriness of the coating.

[0019] The present invention also provides a method for preparing a water-based anti-vein coating composition for the foundry industry, comprising the following preparation process:

[0020] S1: Turn on the high-speed dispersion kettle stirring motor and dispersion motor, and add water, binder, wetting agent, preservative and defoamer in sequence. Disperse at 1000rpm for 20 to 30 minutes.

[0021] S2: Add suspending agent and disperse at high speed of 1000 rpm for 10-30 minutes;

[0022] S3: Add pigments, sintering agents and refractory aggregates, and disperse at 1000 rpm for 30-50 minutes.

[0023] This invention also provides a method for using a water-based anti-veining coating composition for the foundry industry: the water-based anti-veining coating composition for the foundry industry is diluted with water to 30-40 Be before use. In use, the coating can be applied to sand mold areas prone to vein defects using a paint brush, or the entire mold can be dipped in the coating (typical applications include application to 3D printed sand molds and core-shooting sand molds). After dipping in the anti-veining coating of this invention, the sand mold is dried in a drying kiln or microwave drying equipment before subsequent use.

[0024] The beneficial effects of this invention are as follows:

[0025] The key to this water-based anti-veining coating lies in the special design of the refractory aggregate and the sintering agent. The refractory aggregate contains three types of aggregates with different characteristics. Refractory aggregate A has the finest aggregate particles, primarily to ensure the penetration depth of heavy aggregate A; this portion of aggregate preferentially penetrates to form the coating's penetration layer. Refractory aggregate C has the coarsest aggregate particle size, mainly forming the non-penetrating layer and is the main component forming the softening phase at high temperatures. Refractory aggregate B falls between the two. Heavy refractory aggregate A itself has a high density and a higher penetration tendency than other lightweight aggregates, thus ensuring a deeper penetration depth of the coating, which can strengthen the sand mold's strength and refractoriness, increasing the effective coating thickness. Refractory aggregate B has low thermal conductivity, which aims to reduce the rate of heat transfer from the molten metal to the sand mold after casting, preventing the sand mold temperature from rising too quickly, thereby delaying the phase transformation time of the silica sand and consequently delaying the occurrence of thermal cracking in the sand mold. By delaying the hot cracking time of the sand mold until after the molten metal solidifies, even if hot cracks occur in the sand mold, vein defects will not form. Refractory aggregate C is a refractory aggregate with a lamellar structure. Lamellar aggregate particles are impermeable; after coating application, spherical particles tend to penetrate into the sand core, while lamellar particles remain primarily on the impermeable layer of the sand core's outer surface. These aggregate particles also have a low Mohs hardness, allowing them to form a near-glassy softening phase in the casting state. This enables the sand mold to maintain a certain degree of thermoplasticity and resilience. This characteristic ensures that even if slight hot cracks occur in the sand mold, the coating remains intact, thereby reducing or completely eliminating vein defects. The sintering agent component in the formulation lowers the temperature at which the softening phase forms, thus promoting its formation. It also interacts with the silica sand, enhancing the high-temperature strength of the sand mold.

[0026] In 3D sand printing casting processes using silica sand as molding sand, the application scheme of the anti-veining coating of this invention—pre-applying it to areas prone to vein formation followed by overall immersion in conventional coatings (typically applied to 3D printing sand molds and core-shooting sand molds)—completely eliminates vein defects and sand adhesion within the casting cavity. In cold box casting processes using silica sand as molding sand, the application scheme of the anti-veining coating of this invention—pre-applying it to areas prone to vein formation followed by overall immersion in conventional coatings—significantly improves vein defects and sand adhesion within the casting cavity. The anti-veining coating of this invention has high permeability, penetrating to a depth of approximately 2 mm. The anti-veining coating of this invention has low cost, with raw material costs comparable to conventional water-based casting coatings. Detailed Implementation

[0027] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below.

[0028] Implementation Case 1:

[0029] This embodiment provides a water-based anti-veining coating composition for the foundry industry. The raw materials and their proportions are as follows: 1000 kg of refractory aggregate, 80 kg of sintering agent, 70 kg of water, 60 kg of attapulgite, 20 kg of polyvinyl alcohol, 5 kg of acetylenol polyoxyethylene ether, 5 kg of BIT waterborne coating preservative, 5 kg of silicone defoamer, and 50 kg of iron oxide yellow. The refractory aggregate includes 200 kg of zircon powder (refractory aggregate A), 100 kg of vermiculite powder (refractory aggregate B), and 700 kg of muscovite (refractory aggregate C); the sintering agent includes 10 kg of potassium oxide, 20 kg of sodium oxide, 20 kg of sodium fluorosilicate, and 30 kg of glass powder.

[0030] A method for preparing a water-based anti-vein coating composition for the foundry industry includes the following preparation process:

[0031] S1: Turn on the high-speed dispersion kettle stirring motor and dispersion motor, and add 70KG of water, 20KG of binder yellow dextrin, 5KG of wetting agent acetylsadiol polyoxyethylene ether, 5KG of preservative BIT water-based coating preservative, and 5KG of defoamer organosilicon defoamer in sequence, and disperse at 1000rpm for 20 minutes.

[0032] S2: Add 60KG of attapulgite suspending agent and disperse at 1000rpm for 10 minutes;

[0033] S3: Add 50KG of pigment iron oxide yellow, 80KG of sintering agent (including 10KG of potassium oxide, 20KG of sodium oxide, 20KG of sodium fluorosilicate and 30KG of glass powder), and 1000KG of refractory aggregate (including 200G of zircon powder, 100KG of vermiculite powder and 700KG of muscovite), and disperse at 1000rpm for 30 minutes.

[0034] The coating composition prepared by the above steps is used in the following process: The water-based anti-veining coating composition for the foundry industry is diluted with water to 35Be before use. When using, the coating can be applied to sand mold areas prone to vein defects using a paint brush or by overall dip coating. Typical applications include application to 3D printed sand molds and core-shooting sand molds. Implementation Case Two:

[0035] This embodiment provides a water-based anti-veining coating composition for the foundry industry. The raw materials and their proportions are as follows: 1000 kg of refractory aggregate, 50 kg of sintering agent, 70 kg of water, 80 kg of attapulgite, 30 kg of VAE emulsion, 5 kg of fatty alcohol polyoxyethylene ether, 5 kg of CIT / CMIT waterborne coating preservative, 5 kg of silicone defoamer, and 50 kg of iron oxide yellow. The refractory aggregate includes 200 kg of fused white corundum (refractory aggregate A), 100 kg of perlite (refractory aggregate B), and 700 kg of sericite (refractory aggregate C); the sintering agent includes 5 kg of potassium oxide, 5 kg of sodium oxide, 20 kg of sodium fluorosilicate, and 20 kg of glass powder.

[0036] A method for preparing a water-based anti-vein coating composition for the foundry industry includes the following preparation process:

[0037] S1: Turn on the high-speed dispersion kettle stirring motor and dispersion motor, and add 70KG of water, 30KG of binder VAE emulsion, 5KG of wetting agent fatty alcohol polyoxyethylene ether, 5KG of CIT / CMIT water-based coating preservative, and 5KG of defoamer organosilicon defoamer in sequence. Disperse at 1000rpm for 20 minutes.

[0038] S2: Add 80KG of attapulgite suspending agent and disperse at 1000rpm for 10 minutes;

[0039] S3: Add 50KG of pigment iron oxide yellow, 50KG of sintering agent (including 5KG of potassium oxide, 5KG of sodium oxide, 20KG of sodium fluorosilicate and 20KG of glass powder), and 1000KG of refractory aggregate (including 200KG of fused white corundum, 100KG of perlite and 700KG of sericite), and disperse at 1000rpm for 30 minutes.

[0040] The above preparation steps yield a coating composition. The specific application process includes diluting the water-based anti-veining coating composition with water to 30Be before use in the foundry industry. When using, the coating can be applied to sand mold areas prone to vein defects using a paint brush or by overall dip coating. Typical applications include application to 3D printed sand molds and core-shooting sand molds. Implementation Case 3:

[0041] This embodiment provides a water-based anti-veining coating composition for the foundry industry. The raw materials and their proportions are as follows: 1000 kg of refractory aggregate, 100 kg of sintering agent, 75 kg of water, 5 kg of hydroxyethyl cellulose, 40 kg of attapulgite, 25 kg of dextrin, 5 kg of alkylphenol polyoxyethylene ether, 5 kg of DBNPA waterborne coating preservative, 5 kg of silicone defoamer, and 50 kg of iron oxide brown. The refractory aggregate includes 200 kg of chromite powder (refractory aggregate A), 80 kg of asbestos powder (refractory aggregate B), and 720 kg of kaolin (refractory aggregate C); the sintering agent includes 50 kg of potassium oxide, 10 kg of sodium oxide, 10 kg of sodium fluorosilicate, and 30 kg of glass powder.

[0042] A method for preparing a water-based anti-vein coating composition for the foundry industry includes the following preparation process:

[0043] S1: Turn on the high-speed dispersion kettle stirring motor and dispersion motor, and add 70KG of water, 25KG of binder yellow dextrin, 5KG of wetting agent alkylphenol polyoxyethylene ether, 5KG of DBNPA water-based coating preservative, and 5KG of defoamer organosilicon defoamer in sequence. Disperse at 1000rpm for 20 minutes.

[0044] S2: Add 5KG of hydroxyethyl cellulose suspending agent and 40KG of attapulgite clay, and disperse at 1000rpm for 10 minutes;

[0045] S3: Add 50KG of pigment iron oxide brown, 100KG of sintering agent (including 50KG of potassium oxide, 10KG of sodium oxide, 10KG of sodium fluorosilicate and 30KG of glass powder), and 1000KG of refractory aggregate (including 200KG of chromite sand powder, 80KG of asbestos powder and 720KG of kaolin), and disperse at 1000rpm for 30 minutes.

[0046] The above preparation steps yield a coating composition. The specific application process includes diluting the water-based anti-veining coating composition with water to 40Be before use in the foundry industry. When using it, the coating can be applied to sand mold areas prone to vein defects using a paint brush or by overall dip-coating. Typical applications include application to 3D printed sand molds and core-shooting sand molds. Implementation Case Four:

[0047] This embodiment provides a water-based anti-veining coating composition for the foundry industry. The raw materials and their proportions are as follows: 1000 kg of refractory aggregate, 30 kg of sintering agent, 100 kg of water, 10 kg of carboxymethyl cellulose, 40 kg of attapulgite, 15 kg of polyvinyl alcohol (replaced with polyvinyl acetate solution), 5 kg of alkylphenol polyoxyethylene ether, 5 kg of CIT / CMIT waterborne coating preservative, 5 kg of silicone defoamer, and 90 kg of iron oxide black. The refractory aggregate includes 100 kg of brown corundum (refractory aggregate A), 100 kg of microporous calcium silicate (refractory aggregate B), and 750 kg of talc powder (refractory aggregate C); the sintering agent includes 2 kg of potassium oxide, 38 kg of sodium oxide, 2 kg of sodium fluorosilicate, and 8 kg of glass powder.

[0048] A method for preparing a water-based anti-vein coating composition for the foundry industry includes the following preparation process:

[0049] S1: Turn on the high-speed dispersion kettle stirring motor and dispersion motor, and add water 70KG, polyvinyl alcohol (replace with polyvinyl acetate solution) 15KG, wetting agent alkylphenol polyoxyethylene ether 5KG, CIT / CMIT water-based coating preservative 5KG, defoamer organosilicon defoamer 5KG, and disperse at high speed of 1000rpm for 20 minutes.

[0050] S2: Add 10KG of carboxymethyl cellulose suspending agent and 40KG of attapulgite clay, and disperse at 1000rpm for 10 minutes;

[0051] S3: Add 90KG of pigment iron oxide black, 30KG of sintering agent (2KG of potassium oxide, 38KG of sodium oxide, 2KG of sodium fluorosilicate and 8KG of glass powder), and 1000KG of refractory aggregate (100KG of brown fused alumina, 100KG of microporous calcium silicate and 750KG of talc powder), and disperse at 1000rpm for 30 minutes.

[0052] The above preparation steps yield a coating composition. The specific application process includes diluting the water-based anti-veining coating composition with water to 36Be before use in the foundry industry. When using it, the coating can be applied to sand mold areas prone to vein defects using a paint brush or by overall dip-coating. Typical applications include application to 3D printed sand molds and core-shooting sand molds. Implementation Case Five:

[0053] This embodiment provides a water-based anti-vein coating composition for the foundry industry, the raw materials and proportions of which are as follows: 1000KG refractory aggregate, 150KG sintering agent, 100KG water, 10KG methyl cellulose, 10KG attapulgite, 20KG carboxymethyl cellulose, 25KG VAE emulsion, 1KG sorbitan laurate polyoxyethylene ether, 1KG acetylacetonate polyoxyethylene ether, 1KG BIT waterborne coating preservative, 1KG CIT / CMIT waterborne coating preservative, 1KG DBNPA preservative, 10KG silicone defoamer, 30KG iron oxide black, and 10KG iron oxide brown. The refractory aggregates include: Refractory aggregate A consisting of 100 kg of zircon powder and 100 kg of white corundum; Refractory aggregate B consisting of 50 kg of microporous calcium aluminate and 100 kg of closed-cell hollow artificial spherical aggregate particles; Refractory aggregate C consisting of 350 kg of muscovite, 150 kg of lepidolite and 150 kg of talc powder; and sintering agents consisting of 5 kg of potassium oxide, 30 kg of sodium oxide, 50 kg of sodium fluorosilicate and 65 kg of glass powder.

[0054] A method for preparing a water-based anti-vein coating composition for the foundry industry includes the following preparation process:

[0055] S1: Turn on the high-speed dispersion kettle stirring motor and dispersion motor, and add 70KG of water, 25KG of binder VAE emulsion, 1KG of wetting agent sorbitol laurate polyoxyethylene ether and 1KG of acetylacetonate polyoxyethylene ether, 1KG of CIT / CMIT waterborne coating preservative and 1KG of DBNPA preservative, and 10KG of defoamer organosilicon defoamer in sequence. Disperse at 1000rpm for 20 minutes.

[0056] S2: Add 10KG of suspending agent methylcellulose, 10KG of attapulgite clay and 20KG of carboxymethyl cellulose, and disperse at 1000rpm for 10 minutes;

[0057] S3: Add 30KG of pigment iron oxide black and 10KG of iron oxide brown, 150KG of sintering agent (including 5KG of potassium oxide, 30KG of sodium oxide, 50KG of sodium fluorosilicate and 65KG of glass powder), and 1000KG of refractory aggregate (including 100KG of zircon powder, 100KG of white corundum, 50KG of microporous calcium aluminate, 100KG of closed-cell hollow artificial spherical aggregate particles, 350KG of muscovite, 150KG of lepidolite and 150KG of talc powder), and disperse at 1000rpm for 30 minutes.

[0058] The coating composition prepared by the above steps is used in the following specific process: the water-based anti-veining coating composition for the foundry industry is diluted with water to 32-40 Be before use. When using, the coating can be applied to sand mold areas prone to vein defects using a paint brush or by overall dip coating. Typical applications include application to 3D printed sand molds and core-shooting sand molds.

[0059] The anti-veining water-based coatings prepared in the above embodiments were diluted with water to 35±5Be, and then the 24-hour suspension and high-temperature exposure cracking level of the coatings were tested. Anti-veining coating application and anti-veining casting tests were conducted on 3D sand cores and cold-core sand cores. The results are shown in Table 1 below. The data in the table show that the 24-hour suspension of the anti-veining water-based coatings prepared in the embodiments was all above 97%, the high-temperature exposure cracking level was all Class I, and the coating remained intact without cracks after being burned at 1200℃ for 2 minutes. The anti-veining casting test results show that the anti-veining coatings of Examples 1-5 can completely eliminate the vein defects in the 3D sand core casting test blocks; the anti-veining coatings of Examples 1-5 can significantly improve the vein defects in the cold-core sand core casting test blocks.

[0060] Table 1 Comparison of data from the embodiments

[0061]

[0062]

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water-based anti-veining coating composition for the foundry industry, characterized in that, Based on refractory aggregate, the composition includes 100 parts refractory aggregate, 3-15 parts sintering agent, 60-100 parts water, 1-10 parts suspending agent, 0.1-5 parts binder, 0.01-1 part wetting agent, 0.01-1 part corrosion inhibitor, 0.01-1 part defoamer, and 0.1-10 parts pigment by weight. The refractory aggregate comprises refractory aggregate A, refractory aggregate B, and refractory aggregate C, wherein the weight ratio of refractory aggregate A, refractory aggregate B, and refractory aggregate C is 1:(0.3-1.5):(2-8). Refractory aggregate A is a heavy refractory aggregate, refractory aggregate B is a low thermal conductivity refractory aggregate, and refractory aggregate C is a refractory aggregate with a microstructure in which the aggregate particle diameter-to-thickness ratio is ≥10 and it exhibits a flake-like morphology. The refractory aggregate has a particle size range of 50-1250 mesh, wherein the particle size of refractory aggregate A is 300-1250 mesh; the particle size range of refractory aggregate B is 100-400 mesh; and the particle size of refractory aggregate C is 50-200 mesh. The sintering agent is potassium oxide, sodium oxide, sodium fluorosilicate, and glass powder.

2. The water-based anti-vein coating composition for the foundry industry according to claim 1, characterized in that, The refractory aggregate A has a perfectly spherical structure, with the spherical surface covered by a resin film. The resin used for the coating is thermoplastic phenolic resin. The refractory aggregate A is one or more of the following: zircon powder, fused white corundum powder, sintered white corundum, brown corundum, sub-white corundum, chrome corundum, chromium ore powder, and high-alumina bauxite. The bulk density of the refractory aggregate A is 4.0 g / cm³. 3 The above has a fire resistance of over 1600℃.

3. The water-based anti-vein coating composition for the foundry industry according to claim 1, characterized in that, The refractory aggregate B has a microporous structure; the refractory aggregate B is one or more of asbestos powder, vermiculite powder, perlite powder, closed-cell hollow artificial spherical aggregate particles, microporous calcium silicate, microporous calcium aluminate, and microporous magnesium carbonate; the thermal conductivity of the refractory aggregate B is 0.5 W / (m•K). -1 The Mohs hardness of the aggregate crystals is in the range of 1 to 3; the refractoriness of the refractory aggregate B is 1000 to 1500℃.

4. The water-based anti-vein coating composition for the foundry industry according to claim 1, characterized in that, The aspect ratio of the microparticles of the refractory aggregate C is greater than 10:1; the refractory aggregate C is one or more of muscovite, sericite, lepidolite, talc, kaolin, and illite; the refractoriness of the refractory aggregate C is 1200~1600℃.

5. The water-based anti-vein coating composition for the foundry industry according to claim 1, characterized in that, The suspending agent includes one or more of attapulgite, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, guar gum, alkali-swellable polyacrylic acid, and polyurethane.

6. The water-based anti-vein coating composition for the foundry industry according to claim 1, characterized in that, The binder includes one or more of dextrin, VAE emulsion, and polyvinyl acetate emulsion; the wetting agent includes one or more of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, acetylacetonate polyoxyethylene ether, and sorbitol laurate polyoxyethylene ether; the preservative is one or more of BIT, CIT / CMIT, and DBNPA; the defoamer is an organosilicone defoamer; and the pigment is one or more of iron oxide yellow, iron oxide brown, and iron oxide black.

7. A method for preparing a water-based anti-vein coating composition for the foundry industry as described in any one of claims 1-6, characterized in that, The preparation process includes the following: Turn on the stirring motor and dispersion motor of the high-speed dispersion kettle, and add water, binder, wetting agent, preservative and defoamer in sequence. Disperse at 1000 rpm for 20 to 30 minutes. Then add the suspending agent and disperse at high speed of 1000 rpm for 10-30 minutes; Finally, add pigments, sintering agents, and refractory aggregates, and disperse at high speed of 1000 rpm for 30-50 minutes.

8. A method of using a water-based anti-vein coating composition for the foundry industry as described in any one of claims 1-6, characterized in that, The method of use is as follows: The water-based anti-vein coating composition for the foundry industry is diluted with water to 30~40Be before use.

Images