CN117123731A - A kind of water-based anti-veining coating composition for foundry industry - Google Patents
A kind of water-based anti-veining coating composition for foundry industry Download PDFInfo
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- CN117123731A CN117123731A CN202311106579.5A CN202311106579A CN117123731A CN 117123731 A CN117123731 A CN 117123731A CN 202311106579 A CN202311106579 A CN 202311106579A CN 117123731 A CN117123731 A CN 117123731A
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Abstract
本发明涉及铸造涂料技术领域，提供一种铸造工业用水基防脉纹涂料组合物，按质量份计，以耐火骨料为基准，组成成分包括耐火骨料100份、烧结剂3～15份、水60～100份、悬浮剂1～10份、粘结剂0.1～5份、润湿剂0.01～1份、防腐剂0.01～1份、消泡剂0.01～1份、颜料0.1～10份；耐火骨料的组分包含耐火骨料A、耐火骨料B、耐火骨料C，耐火骨料A、耐火骨料B和耐火骨料C重量比例为1:(0.3‑1.5)：(2‑8)，其中，耐火骨料A为重质耐火骨料，耐火骨料B为低热导率耐火骨料，耐火骨料C为微观粒子结构为骨料颗粒径厚比≥10，呈现片状形貌的耐火骨料。有效解决冷芯盒铸造工艺、3D砂型打印铸造工艺中存在的铸件脉纹缺陷，性能好、成本低。The invention relates to the technical field of casting coatings and provides a water-based anti-veining coating composition for the foundry industry. In terms of parts by mass and based on refractory aggregate, the composition includes 100 parts of refractory aggregate, 3 to 15 parts of sintering agent, 60 to 100 parts of water, 1 to 10 parts of suspending agent, 0.1 to 5 parts of binder, 0.01 to 1 part of wetting agent, 0.01 to 1 part of preservative, 0.01 to 1 part of defoaming agent, and 0.1 to 10 parts of pigment; The components of refractory aggregate include refractory aggregate A, refractory aggregate B and refractory aggregate C. The weight ratio of refractory aggregate A, refractory aggregate B and refractory aggregate C is 1:(0.3‑1.5): (2‑ 8), among which, refractory aggregate A is heavy refractory aggregate, refractory aggregate B is low thermal conductivity refractory aggregate, refractory aggregate C has a micro-particle structure with an aggregate particle diameter-thickness ratio ≥ 10, showing a flake shape. Beautiful refractory aggregate. It effectively solves the casting vein defects existing in the cold core box casting process and 3D sand printing casting process, with good performance and low cost.
Description
Technical Field
The invention relates to the technical field of casting coating, in particular to a water-based vein-proof coating composition for casting industry.
Background
Because of the existence of silica sand phase transition, the higher compactness and lower deformability of the core shooting itself, the casting produced by the core shooting process has very obvious vein defects at the inner cavity part; in addition, in the practice of 3D sand mold print casting processes, it has been found that castings produced by 3D sand mold print casting processes using silica sand also have a considerable tendency to streak. These veins often exist in the interior cavity where cleaning is not easy, which makes cleaning difficult, resulting in increased cleaning costs, and the presence of internal dark veins results in many existing runners such as water jacket castings being scrapped. The performance of the commercial vein-preventing paint on the market at present can not meet the actual field requirements.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a water-based vein-proof coating composition for casting industry, which solves the casting vein defects existing in cold box casting technology and 3D sand mould printing casting technology. The invention provides the following technical scheme for achieving the purpose:
the water-based vein-preventing coating composition for the foundry industry comprises, by mass, 100 parts of refractory aggregate, 3-15 parts of sintering agent, 60-100 parts of water, 1-10 parts of suspending agent, 0.1-5 parts of binder, 0.01-1 part of wetting agent, 0.01-1 part of preservative, 0.01-1 part of defoaming agent and 0.1-10 parts of pigment;
the refractory aggregate comprises a refractory aggregate A, a refractory aggregate B and a refractory aggregate C, wherein the weight ratio of the refractory aggregate A to the refractory aggregate B to the refractory aggregate C is 1 (0.3-1.5): (2-8), wherein the refractory aggregate A is heavy refractory aggregate, the refractory aggregate B is low-heat-conductivity refractory aggregate, and the refractory aggregate C is a refractory aggregate with a microscopic particle structure that the particle size thickness ratio of the aggregate is more than or equal to 10 and is in a flaky shape.
In one embodiment, the sintering agent is potassium oxide, sodium fluorosilicate, or glass frit.
In one embodiment, the refractory aggregate has a particle size in the range of 50-1250 mesh, wherein the refractory aggregate A has a particle size in the range of 300-1250 mesh; the granularity range of the refractory aggregate B is 100-400 meshes; the granularity of the refractory aggregate C is 50-200 meshes.
In one embodiment, preferably, the refractory aggregate A has a particle size of 800 to 1000 mesh, the refractory aggregate B has a particle size of 200 to 325 mesh, and the refractory aggregate C has a particle size of 100 to 140 mesh.
In one embodiment, the refractory aggregate A is of a complete spherical structure, the spherical surface is coated with a resin film, and the resin component is thermoplastic phenolic resin; the refractory aggregate A is one or more of zircon powder, electro-fused white corundum powder, sintered white corundum, brown corundum, sub-white corundum, chrome ore sand powder and high-aluminum bauxite (the alumina content is more than or equal to 90 percent); the bulk density of the refractory aggregate A was 4.0g/cm 3 The fire resistance is above 1600 ℃.
In one embodiment, the refractory aggregate B has a micro-porous 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 heat conductivity of the refractory aggregate B is 0.5W/(m.K) -1 The Mohs hardness of the aggregate crystal ranges from 1 to 3; the refractoriness of the refractory aggregate B is 1000-1500 ℃.
In one embodiment, the diameter-to-thickness ratio of the refractory aggregate C microparticles is above 10:1; the refractory aggregate C is one or more of muscovite, sericite, lepidolite, talcum powder, kaolin and illite; the refractoriness of the refractory aggregate C is 1200-1600 ℃.
In one embodiment, the suspending agent comprises one or more of attapulgite, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, guar gum, synthetic polyacrylic acid and polyurethane.
In one embodiment, the binder comprises one or more of yellow dextrin, VAE emulsion, polyvinyl acetate emulsion.
In one embodiment, the wetting agent comprises one or more of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, acetylene glycol polyoxyethylene ether and sorbitol laurate polyoxyethylene ether.
In one embodiment, the preservative is one or more of BIT, CIT/CMIT, DBNPA.
In one embodiment, the defoamer is a silicone defoamer.
In one embodiment, the pigment is one or more of yellow iron oxide, brown iron oxide and black iron oxide.
In one embodiment, flake graphite can be additionally added into the refractory aggregate to ensure higher refractoriness of the coating.
The invention also provides a preparation method of the water-based vein-proof coating composition for the foundry industry, which comprises the following preparation processes:
s1, starting a dispersing motor of a stirring motor box of a high-speed dispersing kettle, sequentially adding water, a binder, a wetting agent, a preservative and a defoaming agent, and dispersing at a high speed of 1000rpm for 20-30 minutes;
s2, adding a suspending agent, and dispersing at a high speed of 1000rpm for 10-30 minutes;
and S3, adding pigment, sintering agent and refractory aggregate, and dispersing at 1000rpm for 30-50 minutes.
The invention also provides a use method of the water-based vein-proof coating composition for the foundry industry, which comprises the following steps: the water-based vein-proof coating composition for the foundry industry is diluted to 30-40 Be by adding water and then used. When the anti-vein paint is used, the paint brush pen can be adopted to brush paint on the sand mould part which is easy to generate vein defects or to carry out integral dip coating (typically applied to a 3D printing sand mould and a core shooting sand mould), the vein paint is dip coated, and the sand mould after the paint is applied is put into a drying kiln or microwave drying equipment for drying, and is transferred into a subsequent use.
The invention has the beneficial effects that:
the water-based vein-proof coating is characterized by being designed on special refractory aggregate and sintering agent. The refractory aggregate contains aggregates of three types of characteristics. The refractory aggregate A has the finest aggregate particles, mainly for ensuring the penetration depth of the heavy aggregate A, and the part of aggregate preferentially penetrates to form a coating penetration layer. The refractory aggregate C has the coarsest aggregate particle size, mainly forms an impermeable layer and is a main component for forming a softened phase at high temperature. Refractory aggregate B is interposed therebetween. The heavy refractory aggregate A has high density and higher penetration tendency than other lightweight aggregates, so that the deeper penetration depth of the coating can be ensured, the functions of reinforcing the strength and the refractoriness of the sand mould can be achieved, and the effective thickness of the coating is increased. The refractory aggregate B has the characteristic of low heat conductivity, and aims to reduce the conduction rate of heat from molten metal to a sand mold after pouring, and the temperature of the sand mold is not too fast, so that the phase change time of silica sand can be delayed, and the occurrence time of sand mold hot cracking can be further delayed. After the hot cracking time of the sand mold is delayed until the molten metal is solidified, even if the sand mold generates hot cracks, the pulse defect can not be generated. The refractory aggregate C is a refractory aggregate with a flaky structure morphology, aggregate particles with a flaky structure have the characteristic of impermeability, particles with a spherical morphology tend to permeate into a sand core after the coating is applied, the flaky particles basically stay in the impermeable layer on the outer surface of the sand core, the Mohs hardness of the aggregate particles is low, a near-glassy softening phase can be formed in a casting state, a certain thermoplasticity and a certain yield can be kept for a sand mold, and the characteristic can ensure that even if slight hot cracks are generated by the sand mold, the integrity of a coating can be ensured, so that the pulse defect is reduced or completely eliminated. The sintering agent component in the formula can reduce the temperature for forming a softening phase, thereby being more beneficial to the formation of the softening phase, and can also act with silica sand to improve the high-temperature strength of the sand mold.
In the 3D sand mould printing and casting process adopting silica sand as molding sand, the pulse-preventing paint is adopted to brush the position which is easy to generate pulse, and then the pulse-preventing paint is applied Tu Fangan (typically applied to a 3D printing sand mould and a core shooting sand mould) of the conventional paint in an integral dip-coating way, so that pulse defect and pulse-sticking sand at the inner cavity of the casting are completely eliminated. In the cold box casting process adopting silica sand as molding sand, the pulse-pattern-preventing coating is adopted to brush the position which is easy to generate pulse patterns in advance and then dip-coat the coating Tu Fangan of the conventional coating integrally, so that the pulse pattern defect and the pulse pattern sand bonding at the inner cavity of the casting are obviously improved. The vein-proof coating provided by the invention has high permeability, and the penetration depth reaches about 2 mm. The vein-proof paint of the invention has lower cost, and the cost price of the raw material of the paint is equivalent to that of the conventional casting water-based paint.
Detailed Description
The present invention will be described more fully hereinafter in order to facilitate an understanding of the present invention.
Embodiment case one:
the embodiment provides a water-based vein-proof coating composition for foundry industry, which comprises the following raw materials in parts by weight: 1000KG of refractory aggregate, 80KG of sintering agent, 70KG of water, 60KG of attapulgite, 20KG of polyvinyl alcohol, 5KG of acetylene glycol polyoxyethylene ether, 5KG of BIT water-based paint preservative, 5KG of organosilicon defoamer and 50KG of iron oxide yellow. Wherein: the refractory aggregate comprises refractory aggregate A which is zircon powder 200KG, refractory aggregate B which is vermiculite powder 100KG and refractory aggregate C which is muscovite 700KG; the sintering agent comprises 10KG of potassium oxide, 20KG of sodium fluosilicate and 30KG of glass powder.
A method for preparing a water-based vein-proof coating composition for foundry industry, which comprises the following preparation processes:
s1, starting a stirring motor box of a high-speed dispersing kettle to disperse a motor, sequentially adding water 70KG, adhesive yellow dextrin 20KG, wetting agent acetylene glycol polyoxyethylene ether 5KG, preservative BIT water-based paint preservative 5KG and defoamer organosilicon defoamer 5KG, and dispersing for 20 minutes at high speed at 1000 rpm;
s2, adding 60KG of attapulgite serving as a suspending agent, and dispersing at a high speed for 10 minutes at 1000 rpm;
and S3, adding pigment iron oxide yellow 50KG, sintering agent 80KG (wherein potassium oxide 10KG, sodium oxide 20KG, sodium fluosilicate 20KG and glass powder 30 KG) and refractory aggregate 1000KG (wherein zircon powder 200G, vermiculite powder 100KG and muscovite 700 KG), and dispersing at 1000rpm for 30 minutes.
The coating composition prepared by the preparation steps comprises the following specific use processes: the water-based vein-proof coating composition for the foundry industry is diluted to 35Be by adding water and then used. When the paint brush is used, the paint brush pen can be used for brushing the paint on the sand mold position which is easy to generate vein defects or carrying out integral dip coating, and the paint brush pen is typically applied to a 3D printing sand mold and a core shooting sand mold. Implementation case two:
the embodiment provides a water-based vein-proof coating composition for foundry industry, which comprises the following raw materials in parts by weight: 1000KG of refractory aggregate, 50KG of sintering agent, 70KG of water, 80KG of attapulgite, 30KG of VAE emulsion, 5KG of fatty alcohol-polyoxyethylene ether, 5KG of CIT/CMIT water-based paint preservative, 5KG of organosilicon defoamer and 50KG of iron oxide yellow. Wherein: the refractory aggregate comprises 200KG of refractory aggregate A which is electro-fused white corundum, 100KG of perlite of refractory aggregate B and 700KG of refractory aggregate C which is sericite; the sintering agent comprises potassium oxide 5KG, sodium fluosilicate 20KG and glass powder 20KG.
A method for preparing a water-based vein-proof coating composition for foundry industry, which comprises the following preparation processes:
s1, starting a stirring motor box of a high-speed dispersing kettle to disperse a motor, sequentially adding water 70KG, adhesive VAE emulsion 30KG, wetting agent fatty alcohol polyoxyethylene ether 5KG, CIT/CMIT water-based paint preservative 5KG and defoamer organosilicon defoamer 5KG, and dispersing for 20 minutes at 1000 rpm;
s2, adding a suspending agent attapulgite 80KG, and dispersing at 1000rpm for 10 minutes at high speed;
and S3, adding pigment iron oxide yellow 50KG, sintering agent 50KG (wherein potassium oxide 5KG, sodium fluosilicate 20KG and glass powder 20 KG) and refractory aggregate 1000KG (wherein electrically fused white corundum 200KG, perlite 100KG and sericite 700 KG), and dispersing at 1000rpm for 30 minutes.
The coating composition prepared by the preparation steps comprises the following specific use processes: the water-based vein-proof coating composition for the foundry industry is diluted to 30Be by adding water and then used. When the paint brush is used, the paint brush pen can be used for brushing the paint on the sand mold position which is easy to generate vein defects or carrying out integral dip coating, and the paint brush pen is typically applied to a 3D printing sand mold and a core shooting sand mold. Implementation case three:
the embodiment provides a water-based vein-proof coating composition for foundry industry, which comprises the following raw materials in parts by weight: 1000KG of refractory aggregate, 100KG of sintering agent, 75KG of water, 5KG of hydroxyethyl cellulose, 40KG of attapulgite, 25KG of yellow dextrin, 5KG of alkylphenol ethoxylate, 5KG of DBNPA water-based paint preservative, 5KG of organosilicon defoamer and 50KG of iron oxide brown. Wherein: the refractory aggregate comprises 200KG of chromium ore powder as refractory aggregate A, 80KG of asbestos powder as refractory aggregate B and 720KG of kaolin as refractory aggregate C; the sintering agent comprises 50KG of potassium oxide, 10KG of sodium fluosilicate and 30KG of glass powder.
A method for preparing a water-based vein-proof coating composition for foundry industry, which comprises the following preparation processes:
s1, starting a stirring motor box of a high-speed dispersing kettle to disperse a motor, sequentially adding water 70KG, adhesive yellow dextrin 25KG, wetting agent alkylphenol ethoxylate 5KG, DBNPA water-based paint preservative 5KG and defoamer organosilicon defoamer 5KG, and dispersing for 20 minutes at high speed at 1000 rpm;
s2, adding 5KG of hydroxyethyl cellulose serving as a suspending agent and 40KG of attapulgite, and dispersing at 1000rpm for 10 minutes at high speed;
and S3, adding pigment iron oxide brown 50KG, sintering agent 100KG (wherein potassium oxide 50KG, sodium oxide 10KG, sodium fluosilicate 10KG and glass powder 30 KG) and refractory aggregate 1000KG (wherein chrome ore sand powder 200KG, asbestos powder 80KG and kaolin 720 KG), and dispersing at 1000rpm for 30 minutes.
The coating composition prepared by the preparation steps comprises the following specific use processes: the water-based vein-proof coating composition for the foundry industry is diluted to 40Be by adding water and then used. When the paint brush is used, the paint brush pen can be used for brushing the paint on the sand mold position which is easy to generate vein defects or carrying out integral dip coating, and the paint brush pen is typically applied to a 3D printing sand mold and a core shooting sand mold. Implementation case four:
the embodiment provides a water-based vein-proof coating composition for foundry industry, which comprises the following raw materials in parts by weight: 1000KG of refractory aggregate, 30KG of sintering agent, 100KG of water, 10KG of carboxymethyl cellulose, 40KG of attapulgite, 15KG of polyvinyl alcohol (changed into polyvinyl acetate solution), 5KG of alkylphenol ethoxylate, 5KG of CIT/CMIT water-based paint preservative, 5KG of organosilicon defoamer and 90KG of iron oxide black. Wherein: the refractory aggregate comprises 100KG of brown corundum as refractory aggregate A, 100KG of microporous calcium silicate as refractory aggregate B and 750KG of talcum powder as refractory aggregate C; the sintering agent comprises potassium oxide 2KG, sodium oxide 38KG, sodium fluosilicate 2KG and glass powder 8KG.
A method for preparing a water-based vein-proof coating composition for foundry industry, which comprises the following preparation processes:
s1, starting a stirring motor box of a high-speed dispersing kettle to disperse a motor, sequentially adding water 70KG, polyvinyl alcohol (changed into polyvinyl acetate solution) 15KG, a wetting agent alkylphenol ethoxylate 5KG, a CIT/CMIT water-based paint preservative 5KG and a defoaming agent organosilicon defoaming agent 5KG, and dispersing at 1000rpm for 20 minutes at high speed;
s2, adding suspending agent carboxymethyl cellulose 10KG and attapulgite 40KG1000rpm for high-speed dispersion for 10 minutes;
and S3, adding pigment iron oxide black 90KG, sintering agent 30KG (potassium oxide 2KG, sodium oxide 38KG, sodium fluosilicate 2KG and glass powder 8 KG), refractory aggregate 1000KG (brown corundum 100KG, microporous calcium silicate 100KG and talcum powder 750 KG) and dispersing at 1000rpm for 30 min.
The coating composition prepared by the preparation steps comprises the following specific use processes: the water-based vein-proof coating composition for the foundry industry is diluted to 36Be by adding water for use. When the paint brush is used, the paint brush pen can be used for brushing the paint on the sand mold position which is easy to generate vein defects or carrying out integral dip coating, and the paint brush pen is typically applied to a 3D printing sand mold and a core shooting sand mold. Implementation case five:
the embodiment provides a water-based vein-proof coating composition for foundry industry, which comprises the following raw materials in parts by weight: 1000KG of refractory aggregate, 150KG of sintering agent, 100KG of water, 10KG of methylcellulose, 10KG of attapulgite, 20KG of carboxymethyl cellulose, 25KG of VAE emulsion, 1KG of sorbitol laurate polyoxyethylene ether, 1KG of acetylenic glycol polyoxyethylene ether, 1KG of BIT water-based paint preservative, 1KG of CIT/CMIT water-based paint preservative, 1KG of DBNPA preservative, 10KG of organosilicon defoamer, 30KG of iron oxide black and 10KG of iron oxide brown. Wherein: the refractory aggregate comprises refractory aggregate A which is zircon powder 100KG, white corundum 100KG, refractory aggregate B which is microporous calcium aluminate 50KG and closed-pore hollow artificial spherical aggregate particles 100KG, and refractory aggregate C which is muscovite 350KG, lepidolite 150KG and talcum powder 150KG; the sintering agent comprises potassium oxide 5KG, sodium oxide 30KG, sodium fluosilicate 50KG and glass powder 65KG.
A method for preparing a water-based vein-proof coating composition for foundry industry, which comprises the following preparation processes:
s1, starting a dispersing motor of a stirring motor box of a high-speed dispersing kettle, sequentially adding water 70KG, a binder VAE emulsion 25KG, a wetting agent sorbitol laurate polyoxyethylene ether 1KG, an acetylenic diol polyoxyethylene ether 1KG, a CIT/CMIT water-based paint preservative 1KG, a DBNPA preservative 1KG, a defoaming agent organosilicon defoaming agent 10KG and 1000rpm for high-speed dispersion for 20 minutes;
s2, adding suspending agents of 10KG of methylcellulose, 10KG of attapulgite and 20KG of carboxymethylcellulose, and dispersing at 1000rpm for 10 minutes at high speed;
and S3, adding pigment iron oxide black 30KG and iron oxide brown 10KG, sintering agent 150KG (wherein potassium oxide 5KG, sodium oxide 30KG, sodium fluosilicate 50KG and glass powder 65 KG), refractory aggregate 1000KG (wherein zircon powder 100KG, white corundum 100KG, microporous calcium aluminate 50KG, closed-cell hollow artificial spherical aggregate particles 100KG, white mica 350KG, lepidolite 150KG and talcum powder 150 KG), and dispersing at 1000rpm for 30 minutes.
The coating composition prepared by the preparation steps comprises the following specific use processes: the water-based vein-proof coating composition for the foundry industry is diluted to 32 to 40Be by adding water and then used. When the paint brush is used, the paint brush pen can be used for brushing the paint on the sand mold position which is easy to generate vein defects or carrying out integral dip coating, and the paint brush pen is typically applied to a 3D printing sand mold and a core shooting sand mold.
The anti-pulsation water-based paint prepared in each of the above examples was diluted to 35.+ -.5 Be with water, and then the paint was tested for 24h suspension property, high temperature heat crack rating, and the anti-pulsation paint application and anti-pulsation casting test of the 3D sand core and the cold core sand core were performed, with the results shown in Table 1 below. As can be seen from the data in the table, the 24h suspension property of the anti-pulse water-based paint prepared in the examples is more than 97%, the high-temperature heat-exposure cracking grade is grade I, and the coating is complete and has no crack after being burned for 2 minutes at 1200 ℃. The results of the vein casting test show that: the vein-preventing coating of examples 1-5 can completely eliminate vein defects of the 3D sand core casting test block; the vein-proofing coating of examples 1-5 can significantly improve the vein defects of cold box sand core casting test blocks.
Table 1 example data comparison
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limited thereto; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The water-based vein-preventing coating composition for the foundry industry is characterized by comprising, by mass, 100 parts of refractory aggregate, 3-15 parts of sintering agent, 60-100 parts of water, 1-10 parts of suspending agent, 0.1-5 parts of binder, 0.01-1 part of wetting agent, 0.01-1 part of preservative, 0.01-1 part of defoaming agent and 0.1-10 parts of pigment;
the refractory aggregate comprises a refractory aggregate A, a refractory aggregate B and a refractory aggregate C, wherein the weight ratio of the refractory aggregate A to the refractory aggregate B to the refractory aggregate C is 1 (0.3-1.5): (2-8), wherein the refractory aggregate A is heavy refractory aggregate, the refractory aggregate B is low-heat-conductivity refractory aggregate, and the refractory aggregate C is a refractory aggregate with a microscopic particle structure that the particle size thickness ratio of the aggregate is more than or equal to 10 and is in a flaky shape.
2. The water-based vein-proofing coating composition for foundry industry according to claim 1, wherein said sintering agent is potassium oxide, sodium fluosilicate and glass frit.
3. The water-based vein-proofing coating composition for foundry industry according to claim 1, wherein the refractory aggregate has a particle size ranging from 50 to 1250 mesh, wherein the refractory aggregate a has a particle size ranging from 300 to 1250 mesh; the granularity range of the refractory aggregate B is 100-400 meshes; the granularity of the refractory aggregate C is 50-200 meshes.
4. The water-based vein-proofing coating composition for foundry industry according to claim 1, wherein the refractory aggregate a has a completely spherical structure, the spherical surface is coated with a resin film, and the resin component is a thermoplastic phenolic resin; the refractory aggregate A is one or more of zircon powder, electric melting white corundum powder, sintering white corundum, brown corundum, sub-white corundum, chrome ore powder and high-aluminum bauxite (the aluminum oxide content is more than or equal to 90 percent); the bulk density of the refractory aggregate A is 4.0g/cm 3 The fire resistance is above 1600 ℃.
5. A foundry industry water-based vein-proofing coating composition according to claim 1, wherein said refractory aggregate B has a micro-porous 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 heat conductivity of the refractory aggregate B is 0.5W/(m.K) -1 The Mohs hardness of the aggregate crystal ranges from 1 to 3; the refractoriness of the refractory aggregate B is 1000-1500 ℃.
6. The water-based vein-proofing coating composition for foundry industry according to claim 1, wherein the diameter-to-thickness ratio of refractory aggregate C microparticles is 10:1 or more; the refractory aggregate C is one or more of muscovite, sericite, lepidolite, talcum powder, kaolin and illite; the refractoriness of the refractory aggregate C is 1200-1600 ℃.
7. The water-based vein-proofing coating composition for foundry industry according to claim 1, wherein the suspending agent comprises one or more of attapulgite, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, guar gum, alkali-swellable polyacrylic acid, polyurethane.
8. The water-based vein-proofing coating composition for foundry industry according to claim 1, wherein said binder comprises one or more of yellow dextrin, VAE emulsion, polyvinyl acetate emulsion; the wetting agent comprises one or more of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, acetylene glycol polyoxyethylene ether and sorbitol laurate polyoxyethylene ether; the preservative is one or more of BIT, CIT/CMIT and DBNPA; the defoaming agent is an organosilicon defoaming agent; the pigment is one or more of iron oxide yellow, iron oxide brown and iron oxide black.
9. A process for preparing a water-based vein-proofing coating composition for foundry industry as claimed in any one of claims 1 to 8, which comprises the following steps:
starting a stirring motor box of the high-speed dispersing kettle to disperse a motor, sequentially adding water, a binder, a wetting agent, a preservative and a defoaming agent, and dispersing at 1000rpm for 20-30 minutes;
then adding suspending agent, dispersing at 1000rpm for 10-30 minutes;
finally adding pigment, sintering agent and refractory aggregate, and dispersing at 1000rpm for 30-50 min.
10. A method of using the aqueous anti-vein coating composition for foundry industry as set forth in any one of claims 1 to 8, characterized by the following method of use: the water-based vein-proof coating composition for the foundry industry is diluted to 30-40 Be by adding water and then used.
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| EP4656310A1 (en) * | 2024-05-28 | 2025-12-03 | Safran | Method for making an improved core for a lost wax casting process |
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