Efficient anti-burning sand casting coating and preparation method thereof
By using precise proportions and process optimization, and employing specific materials and additives, the anti-sticking sand coating solves the stability and thermal shock problems of traditional coatings under high-temperature environments, achieving efficient anti-sticking sand and improved casting quality.
Patent Information
- Application Number
- CN202511278013.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-09
- Publication Date
- 2025-12-09
AI Technical Summary
Traditional anti-sand-adhesion coatings are prone to thermal expansion, cracking, and peeling under high-temperature conditions, resulting in defects such as sand adhesion and sand holes on the surface of castings. Furthermore, their thermal shock buffering capacity is limited, affecting casting quality.
The coating utilizes materials such as chromite sand, graphite powder, nano-siloxane, modified bentonite, bio-based ethanol, inorganic silicate binder, ceramic glaze KT-2002, ultrafine titanium dioxide, and diatomaceous earth, along with additives such as super-dispersants, thickeners, leveling agents, antioxidants, and microcapsule phase change materials. Through precise proportioning, drying and pulverizing, multi-stage stirring, and vacuum degassing processes, the stability and thermal buffering performance of the coating are optimized.
It improves the high-temperature stability and corrosion resistance of the coating, reduces molten metal penetration and casting surface defects, enhances the thermal stability and construction adaptability of the coating, reduces the risk of coating peeling, and improves casting quality.
Smart Images
Figure CN121082811A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of casting materials, in particular to an efficient anti-sand sticking casting coating and a preparation method thereof. BACKGROUND
[0002] In the casting process, the main role of the anti-sand sticking coating is to prevent the physical or chemical adhesion of liquid metal to the sand mold during high-temperature casting, thereby affecting the surface quality of the casting. The traditional anti-sand sticking coating usually adopts a simple mixing method of refractory filler and binder, relying on the high-temperature resistance of the filler and the adhesion of the binder to form a protective layer. However, in a high-temperature casting environment, the thermal stability of the traditional coating is poor, and the structure is easily damaged after heating, leading to coating peeling or failure, allowing the metal liquid to penetrate into the sand mold, thereby forming casting defects such as sand sticking and sand holes. In addition, the temperature changes during casting can easily cause thermal stress concentration in the coating, leading to cracking and peeling, affecting the casting quality.
[0003] Another problem with existing anti-sand sticking coatings is that the coating has limited thermal shock buffering capacity. Because the particle size of the traditional filler is large, the materials with different thermal expansion coefficients are not tightly combined, and the coating structure is unstable due to uneven expansion when the temperature changes sharply, and there is a lack of efficient thermal buffering materials, so the coating cannot effectively absorb and release heat energy, further increasing the risk of peeling of the coating, leading to the occurrence of casting defects. SUMMARY
[0004] In view of the deficiencies of the prior art, the present application provides an efficient anti-sand sticking casting coating and a preparation method thereof, which solves the problem that the traditional anti-sand sticking coating is easily expanded, cracked and peeled under high-temperature environment, leading to defects such as sand sticking and sand holes on the surface of the casting, and the lack of effective thermal buffering materials, which can easily cause structural damage to the coating when the temperature changes sharply, further increasing the risk of peeling.
[0005] To achieve the above purpose, the present application is implemented by the following technical scheme: an efficient anti-sand sticking casting coating, comprising materials and additives:
[0006] The materials include chrome sand, graphite powder, nanosiloxane, modified bentonite, bio-based ethanol, inorganic silicate binder, ceramic glaze KT-2002, ultra-fine titanium dioxide, diatomite, and stearic amide.
[0007] The additives include superdispersant, thickening agent, leveling agent, dispersion aid, antioxidant, microcapsule phase change material, high-temperature lubricant, functionalized nanoparticles, and thermal conductivity enhancer.
[0008] The use amount of the material is respectively: the use amount of chrome ore sand is 30-40 parts, the use amount of graphite powder is 10-15 parts, the use amount of nano siloxane is 8-12 parts, the use amount of modified bentonite is 4-6 parts, the use amount of bio-based ethanol is 4-6 parts, the use amount of inorganic silicate binder is 4-6 parts, the use amount of ceramic glaze KT-2002 is 10-15 parts, the use amount of ultra-fine titanium dioxide is 6-10 parts, the use amount of diatomite is 4-6 parts, and the use amount of stearic acid amide is 4-6 parts;
[0009] The use amount of the auxiliary agent is respectively: the use amount of ultra-dispersant including sodium polycarboxylate and polyvinylpyrrolidone PVP is 0.5-1 part, the use amount of thickening agent including modified cellulose and xanthan gum is 0.2-0.5 part, the use amount of leveling agent including siloxane leveling agent is 0.2-0.5 part, the use amount of dispersion aid including sulfonate and polycarboxylate is 0.5-1 part, the use amount of antioxidant including nano-aluminum oxide and nano-zirconium oxide is 1-2 parts, the use amount of microcapsule phase change material including encapsulated Al2O3-SiO2 composite material is 1-2 parts, the use amount of high-temperature lubricant including boron nitride powder BN is 1-3 parts, the use amount of functionalized nanoparticles including nano-SiO2 and nano-TiO2 is 2-5 parts, and the use amount of thermal conductivity enhancer including graphene powder is 0.5-1 part.
[0010] A preparation method of high-efficiency anti-sticking sand casting paint, comprising the following steps:
[0011] S1, raw material pretreatment and batching: first, the materials are weighed according to the formula, then the preliminary treatment is carried out through the drying immersion equipment, and then the auxiliary agents are weighed according to the proportion for standby;
[0012] S2, liquid phase preparation: the weighed materials are added into a stirring kettle, bio-based ethanol and inorganic silicate binder are first added, and then ultra-dispersant, thickening agent, leveling agent and dispersion aid are sequentially added;
[0013] S3, dry-wet mixing: then the pretreated refractory filler is put into a high-speed dry mixer, and then the liquid phase system is gradually poured in, and then secondary dispersion stirring is carried out through a shearing machine;
[0014] S4, auxiliary agent addition and homogenization grinding: then the previously standby auxiliary agents are sequentially added, and a sand mill or a ball mill is used for grinding, so that the uniformity of the auxiliary agents is unified;
[0015] S5, vacuum defoaming and rheological adjustment: the slurry is defoamed through vacuum to remove bubbles and improve construction stability, the viscosity is determined by a rotary viscometer, the viscosity is adjusted by adjusting the proportion of bio-based ethanol or auxiliary agent when necessary, the shear performance is detected by a rheometer, and finally the undispersed particles are taken out through a filter screen and can be stored.
[0016] Preferably, the drying temperature of the drying equipment in S1 is 100-120℃, and the drying time is 2-3 hours, and the drying product is ground by ball milling or airflow crushing to 10-50μm to prevent agglomeration and improve dispersibility.
[0017] Preferably, in S2, the stirring time is 15-20 minutes, and the stirring speed of the stirring tank is 150-200 revolutions per minute until complete dissolution, and the stirring speed is 200-250 revolutions per minute when the super dispersant, thickening agent, leveling agent and dispersion aid are added, wherein the super dispersant is added first, stirred for 1-2 minutes, then the thickening agent, leveling agent and dispersion aid are added, and continue to stir for 10-15 minutes to form a stable and uniform liquid phase system until the stirring is uniform.
[0018] Preferably, in S3, the stirring time of the high-speed dry mixer is 10-15 minutes, and the high-speed shearing machine is used for 20-30 minutes at 1000-3000 revolutions per minute to fully wet and uniformly disperse the particles.
[0019] Preferably, in S4, the particle size after grinding is 10-50μm, and the addition sequence of the additives is: first, the antioxidant is added and stirred for 5-8 minutes at a speed of 300-500 revolutions per minute, then the microcapsule phase change material is added and stirred for 10-15 minutes at a speed of 800-1000 revolutions per minute, then the boron nitride powder is added and stirred for 12-18 minutes at a speed of 1000-1200 revolutions per minute, then the functionalized nanoparticles are added and stirred for 5-8 minutes at a speed of 800-1200 revolutions per minute, and finally the graphene powder is added and stirred for 15-20 minutes at a speed of 1200-1500 revolutions per minute until the mixture is uniform.
[0020] Preferably, in S5, the defoaming time is selected as 15-20 minutes when the initial volume of the slurry is greater than 100L, and the defoaming time is selected as 10-15 minutes when the initial volume of the slurry is less than or equal to 100L, the rotor with a diameter of 20-30mm is selected for viscosity measurement at a speed of 50-100 revolutions per minute, if the measured viscosity value is less than 500mPas, the proportion of thickening agent is increased, and the viscosity is re-measured every time the proportion of thickening agent is increased by 0.1, until the viscosity reaches the target range, if the measured viscosity value is greater than 1500mPas, the amount of bio-based ethanol is increased, and the viscosity is measured again after the amount of bio-based ethanol is increased by 0.5-1 each time, the un-dispersed particles are removed by filtering through a 200-250 mesh stainless steel screen, and the storage is carried out by loading into a sealed barrel and storing in a dry environment at 5-25℃.
[0021] The application provides a high-efficiency anti-sticking sand casting coating and a preparation method thereof.
[0022] 1、The application realizes the stability and erosion resistance of the coating under high-temperature conditions, improves the anti-sticking sand capacity, reduces the metal liquid penetration and casting surface defects, realizes the enhancement of the thermal stability of the coating and the optimization of the thermal shock buffering capacity by using the nano-functionalized particles and microcapsule phase change materials, and achieves the effects of reducing the peeling risk of the coating and improving the casting adaptability.
[0023] 2、The application realizes the high-temperature stability and uniform particle dispersion of the coating by using the accurate drying and crushing process, controlling the particle size of the refractory filler to be 10-50 mu m, and optimizing the proportion of the additives, thereby improving the anti-sticking sand effect and reducing the metal liquid penetration and casting surface defects.
[0024] 3、The application realizes the densification enhancement and particle agglomeration inhibition of the coating by using the multi-stage stirring and high-speed shearing mixing process, ensures the full wetting of the filler and the uniform dispersion of the additives, realizes the densification enhancement and particle agglomeration inhibition of the coating, and achieves the effects of smooth construction, uniform and stable coating, and reduction of brush marks and sagging.
[0025] 4、The application optimizes the rheological properties and storage stability of the coating by using the vacuum degassing, viscosity fine control and high-efficiency filtration technology, realizes the enhancement of the construction adaptability, and achieves the effects of improving the coating construction consistency, prolonging the storage life, and reducing the casting defects. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 The application provides a high-efficiency anti-sticking sand casting coating preparation method. DETAILED DESCRIPTION
[0027] The technical solutions of the application will be described clearly and completely below with reference to the drawings of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.
[0028] The application provides a high-efficiency anti-sticking sand casting coating, which comprises materials and additives,
[0029] The materials include chrome ore sand, graphite powder, nano-siloxane, modified bentonite, bio-based ethanol, inorganic silicate binder, ceramic glaze KT-2002, ultra-fine titanium dioxide, diatomite, stearic amide;
[0030] The assistants include super dispersant, thickening agent, leveling agent, dispersion aid, antioxidant, microcapsule phase change material, high-temperature lubricant, functionalized nanoparticles, thermal conductivity enhancer.
[0031] The use amounts of the materials are as follows: the use amount of chrome ore sand is 30-40 parts, the use amount of graphite powder is 10-15 parts, the use amount of nano-siloxane is 8-12 parts, the use amount of modified bentonite is 4-6 parts, the use amount of bio-based ethanol is 4-6 parts, the use amount of inorganic silicate binder is 4-6 parts, the use amount of ceramic glaze KT-2002 is 10-15 parts, the use amount of ultra-fine titanium dioxide is 6-10 parts, the use amount of diatomite is 4-6 parts, and the use amount of stearic amide is 4-6 parts;
[0032] The use amounts of the assistants are as follows: the use amount of super dispersant including sodium polycarboxylate and polyvinylpyrrolidone PVP is 0.5-1 part, the use amount of thickening agent including modified cellulose and xanthan gum is 0.2-0.5 part, the use amount of leveling agent including siloxane leveling agent is 0.2-0.5 part, the use amount of dispersion aid including sulfonate and polycarboxylate is 0.5-1 part, the use amount of antioxidant including nano-alumina and nano-zirconia is 1-2 parts, the use amount of microcapsule phase change material including encapsulated Al2O3-SiO2 composite material is 1-2 parts, the use amount of high-temperature lubricant including boron nitride powder BN is 1-3 parts, the use amount of functionalized nanoparticles including nano-SiO2 and nano-TiO2 is 2-5 parts, and the use amount of thermal conductivity enhancer including graphene powder is 0.5-1 part.
[0033] Specifically, the refractory filler, binder, solvent and various functional assistants are proportioned to improve the high-temperature stability, anti-sticking sand performance and construction adaptability of the coating. The coating system contains refractory components to enhance heat resistance and corrosion resistance, binder components to ensure coating strength, and assistant components to optimize construction and use performance, so that the coating exhibits excellent comprehensive properties during casting;
[0034] The refractory filler provides high-temperature corrosion resistance, improves coating uniformity and structural stability; the binder component enhances the adhesion of the coating, improves the overall strength and stability, the solvent adjusts the flowability of the system to ensure the convenience and environmental friendliness of the construction; the assistant component optimizes the microstructure of the coating, reduces particle agglomeration, improves dispersibility and construction adaptability, enhances oxidation resistance, optimizes lubrication effect and reduces adhesion tendency;
[0035] The application realizes efficient anti-sticking sand effect by precisely controlling the content of each component, optimizes the coating structure, improves the high-temperature stability and anti-adhesion performance, reduces casting defects, and improves the surface quality of castings, and is suitable for various casting processes.
[0036] Please refer to the attached Figure 1 A preparation method of the efficient anti-sticking sand casting coating, comprising the following steps:
[0037] S1, raw material pretreatment and batching: first, the materials are weighed according to the formula, then the preliminary treatment is carried out through the drying immersion equipment, and then the additives are weighed according to the proportion for standby;
[0038] S2, liquid phase preparation: the weighed materials are added into the stirring kettle, bio-based ethanol and inorganic silicate binder are first added, and then super dispersant, thickening agent, leveling agent and dispersion aid are sequentially added;
[0039] S3, dry and wet mixing: then the pretreated refractory filler is put into a high-speed dry mixer, and then the liquid phase system is gradually poured in, and then secondary dispersion stirring is carried out through a shearing machine;
[0040] S4, additive addition and homogenization grinding: then the previously standby additives are sequentially added, and a sand mill or a ball mill is used for grinding to unify the uniformity of the additives;
[0041] S5, vacuum degassing and rheological adjustment: the slurry is degassed by vacuum to remove bubbles and improve the construction stability, the viscosity is determined by a rotary viscometer, the viscosity is adjusted by adjusting the proportion of bio-based ethanol or additives when necessary, the shear performance is detected by a rheometer, and finally the undispersed particles are taken out through a filter screen and can be stored.
[0042] In S1, the drying temperature of the drying equipment is 100-120 DEG C, and the drying time is 2-3 hours, and after drying, the ball milling or air flow crushing is carried out to 10-50 microns, which is used to prevent agglomeration and improve the dispersibility.
[0043] Specifically, first, the raw materials used need to be accurately treated to ensure that the finally prepared efficient anti-sticking sand casting coating has excellent performance. The raw materials include chrome sand, graphite powder, nano-siloxane (SiO2), ultra-fine titanium dioxide (TiO2), diatomite, ceramic glaze and stearic amide, etc. Among these raw materials, chrome sand and graphite powder are the main refractory fillers, and nano-siloxane, ultra-fine titanium dioxide and diatomite, etc. have the effects of enhancing the high-temperature resistance, anti-sticking sand and oxidation resistance of the coating. In order to effectively prevent the formation of particle agglomeration during the preparation of the coating, it needs to be dried and crushed;
[0044] The raw materials are dried using a drying device, with the drying temperature controlled between 100-120°C and the drying time being 2-3 hours. This temperature and time setting can ensure that the moisture in the raw materials is fully removed, preventing the agglomeration and uneven dispersion of the raw materials due to the presence of moisture during the subsequent mixing process. In addition, after drying, the particles are refined to 10-50 μm through ball milling or air flow crushing, further improving the dispersibility and flowability of the powder, thereby avoiding the agglomeration phenomenon between particles. The crushed particles have better dispersibility and higher specific surface area, which helps to improve the uniformity and adhesion of the paint, thereby providing stronger anti-sand sticking effect for the paint during the high-temperature casting process. In this process, by precisely controlling the particle size and dispersibility of the crushed particles, the stability of the paint can be significantly improved, reducing problems such as sedimentation, stratification and uneven coating in actual application. In addition, the refined particles not only improve the anti-adhesion of the paint, but also improve the overall mechanical strength and high-temperature resistance of the coating, ensuring that the paint works stably for a long time during the casting process. Therefore, this drying and crushing step is crucial for improving the overall performance of the anti-sand sticking paint.
[0045] In S2, when bio-based ethanol and inorganic silicate binder are added, the stirring time is 15-20 minutes, the stirring tank rotation speed is 150-200 revolutions / minute until complete dissolution, when the hyperdispersant, thickening agent, leveling agent and dispersion aid are added, the stirring speed is 200-250 revolutions / minute, wherein the hyperdispersant is added first, stirring for 1-2 minutes, then the thickening agent, leveling agent and dispersion aid are added, continuing to stir for 10-15 minutes to form a stable and uniform liquid phase system.
[0046] Specifically, first, bio-based ethanol and inorganic silicate binder are added to the stirring tank, the stirring speed is set to 150-200 revolutions / minute, and the stirring is continued for 15-20 minutes until the binder is completely dissolved to form a uniform liquid phase system. Bio-based ethanol can reduce the surface tension of the system and improve the wettability of the filler, and inorganic silicate binder can enhance the structural strength of the coating and improve the heat resistance and stability.
[0047] After the binder is dissolved, the hyperdispersant, thickening agent, leveling agent and dispersion aid are gradually added. The stirring speed is increased to 200-250 revolutions / minute, the hyperdispersant is added first and stirred for 1-2 minutes to improve the wettability of the filler and prevent particle agglomeration. Then the thickening agent, leveling agent and dispersion aid are added in turn, and the stirring is continued for 10-15 minutes until uniform. The thickening agent adjusts the rheological properties of the paint to prevent sedimentation, the leveling agent improves the flatness of the coating to reduce brush marks and sagging, the dispersion aid optimizes the dispersion state of the filler to improve the storage stability, ensures the stability of the liquid phase system, lays the foundation for uniform dispersion of the filler, improves the construction adaptability of the paint, reduces the deposition phenomenon, improves the uniformity and high temperature resistance of the coating, thereby ensuring the reliability and excellent performance of the anti-sand sticking paint.
[0048] S3 in the high-speed dry mixer stirring time for 10-15 minutes, shear machine using high-speed shear machine 1000-3000 rpm, stirring time for 20-30 minutes, high-speed shear machine for making particles fully wet and evenly dispersed.
[0049] Specifically, first, the refractory filler after drying and crushing into a high-speed dry mixer for pre-mixing, stirring time set for 10-15 minutes to ensure uniform distribution of components, reduce the possibility of subsequent wet mixing process of particle agglomeration;
[0050] Then, the dry filler gradually prepared into the liquid phase system, using a high-speed shear wet mixing. Shear machine speed control at 1000-3000 rpm, stirring time for 20-30 minutes. The high-speed shear process can be broken by strong shear force filler agglomeration, particles fully wet and evenly dispersed in the liquid phase, improve the uniformity and stability of the coating. Fully wetted filler can better with the binder to enhance the adhesion and high temperature performance of the final coating, while reducing the filler settlement, improve the storage stability and construction adaptability, by reasonable control of stirring parameters, so that the filler evenly distributed in the coating system, avoid local concentration or particle agglomeration, improve the overall performance of the anti-stick sand coating, for subsequent grinding and coating provides a good foundation.
[0051] S4 in the particle size after grinding for 10-50 μm, the order of the addition of additives is first added antioxidant stirring 5-8 minutes, speed 300-500 rpm, followed by adding microcapsule phase change material stirring 10-15 minutes, speed 800-1000 rpm, then add boron nitride powder stirring 12-18 minutes, speed 1000-1200 rpm, then add functional nanoparticles stirring 5-8 minutes, speed 800-1200 rpm, and finally add graphene powder stirring 15-20 minutes, speed 1200-1500 rpm until evenly mixed.
[0052] Specifically, first, the paint slurry after pre-mixing and dispersion treatment enters the grinding stage, using a ball mill or sand mill for grinding, the particle size is controlled at 10-50 μm, to improve the fineness of the filler, to ensure the density and uniformity of the coating, after grinding, the system is added with additives in turn, and the stirring sequence and speed are controlled, the antioxidant (such as nano-aluminum oxide or nano-zirconium oxide) is added, and stirred at a speed of 300-500 rpm for 5-8 minutes, so that it is uniformly dispersed, and the oxidation resistance of the coating is improved. Subsequently, the microcapsule phase change material is added, and the stirring speed is increased to 800-1000 rpm, and stirred for 10-15 minutes, to improve the thermal stability of the coating, and reduce the influence of temperature fluctuation on the performance of the coating. Then, boron nitride powder (BN) is added, and the stirring speed is increased to 1000-1200 rpm, and the stirring is continued for 12-18 minutes, to enhance the high-temperature lubricity of the coating, and reduce the adhesion between the casting and the mold;
[0053] Subsequently, functionalized nanoparticles (such as nano-SiO2, nano-TiO2) are added, and the stirring speed is controlled at 800-1200 rpm, and the stirring is continued for 5-8 minutes, to optimize the dispersibility of the filler, and improve the high-temperature corrosion resistance of the coating. Finally, graphene powder is added, and the stirring speed is increased to 1200-1500 rpm, and the stirring is continued for 15-20 minutes, so that it is uniformly distributed in the paint system, to improve the thermal conductivity and wear resistance of the coating, and further enhance the anti-sand effect, to ensure uniform dispersion of each component, and improve the comprehensive performance of the paint. This step optimizes the high-temperature stability, oxidation resistance and lubricity of the coating, and lays a foundation for the efficient anti-sand performance of the paint in the final casting process.
[0054] S5, during the vacuum defoaming process, when the initial volume of the slurry is greater than 100 L, the defoaming time is selected as 15-20 minutes, and when the initial volume of the slurry is less than or equal to 100 L, the defoaming time is selected as 10-15 minutes, when measuring the viscosity with a rotary viscometer, a rotor with a diameter of 20-30 mm is selected, and the rotation speed is set as 50-100 rpm for measurement, if the measured viscosity value is less than 500 mPas, the proportion of thickening agent is preferentially increased, and the viscosity is re-measured every time the proportion of thickening agent is increased by 0.1 part, until the viscosity reaches the target range, if the measured viscosity value is greater than 1500 mPas, the amount of bio-based ethanol is preferentially increased, and the viscosity is measured again after increasing the amount of bio-based ethanol by 0.5-1 part each time, the un-dispersed particles are removed by filtering through a 200-250 mesh stainless steel screen, and the storage is carried out by loading into a sealed barrel and storing in a dry environment at 5-25 °C.
[0055] Specifically, first, for the possible bubbles remaining in the paint slurry, vacuum debubbling treatment is adopted to avoid the influence of bubbles on the quality of the coating. During debubbling, the appropriate debubbling time is selected according to the initial volume of the slurry. When the initial volume of the slurry is greater than 100 L, the debubbling time is controlled at 15-20 minutes, and when the initial volume of the slurry is less than or equal to 100 L, the debubbling time is set to 10-15 minutes. During the debubbling process, the vacuum degree is maintained at -0.08 to -0.1 MPa to effectively remove the bubbles in the slurry, improve the construction stability, and prevent pinholes or defects in the coating during application;
[0056] After debubbling is completed, the viscosity of the paint is measured using a rotational viscometer to ensure that it meets the construction requirements. When measuring, a rotor with a diameter of 20-30 mm is selected, and the rotation speed is set to 50-100 revolutions per minute to obtain accurate viscosity data. If the measurement result shows that the viscosity is less than 500 mPa·s, the proportion of thickening agent is preferentially increased, and after each increase of 0.1 part, the viscosity is re-measured until the viscosity reaches the target range. If the viscosity is greater than 1500 mPa·s, the amount of bio-based ethanol is preferentially increased, and after each increase of 0.5-1 part of bio-based ethanol, the viscosity is re-measured until the viscosity is adjusted to the appropriate range. Through this precise adjustment process, the construction performance of the paint is ensured, and sagging or settling is avoided, improving the applicability;
[0057] Subsequently, the adjusted paint is filtered through a 200-250 mesh stainless steel screen to remove particles that have not been fully dispersed, ensuring the uniformity and stability of the final paint system. Finally, the filtered paint is loaded into a sealed drum and stored in a dry environment at 5-25°C to maintain its physical and chemical stability and prevent solvent evaporation or analysis. This step ensures that the final prepared anti-stick sand paint has good construction performance and long-term use stability by reasonably controlling the debubbling, viscosity adjustment, and storage processes.
[0058] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A high-efficiency anti-sticking sand casting coating, comprising materials and additives, characterized in that: The materials include chromite sand, graphite powder, nano-siloxane, modified bentonite, bio-based ethanol, inorganic silicate binder, ceramic glaze KT-2002, ultrafine titanium dioxide, diatomaceous earth, and stearamide. The additives include superdispersants, thickeners, leveling agents, dispersants, antioxidants, microencapsulated phase change materials, high-temperature lubricants, functionalized nanoparticles, and thermal conductivity enhancers.
2. The high-efficiency anti-sticking sand casting coating according to claim 1, characterized in that: The materials used are as follows: 30-40 parts chromite sand, 10-15 parts graphite powder, 8-12 parts nano-siloxane, 4-6 parts modified bentonite, 4-6 parts bio-based ethanol, 4-6 parts inorganic silicate binder, 10-15 parts ceramic glaze KT-2002, 6-10 parts ultrafine titanium dioxide, 4-6 parts diatomaceous earth, and 4-6 parts stearamide. The usage amounts of the additives are as follows: superdispersants including sodium polycarboxylate and polyvinylpyrrolidone (PVP) are used at 0.5-1 parts; thickeners including modified cellulose and xanthan gum are used at 0.2-0.5 parts; leveling agents including siloxane leveling agents are used at 0.2-0.5 parts; dispersing aids including sulfonates and polycarboxylates are used at 0.5-1 parts; antioxidants including nano-alumina and nano-zirconia are used at 1-2 parts; microcapsule phase change materials including encapsulated Al2O3-SiO2 composite materials are used at 1-2 parts; high-temperature lubricants including boron nitride powder (BN) are used at 1-3 parts; functionalized nanoparticles including nano-SiO2 and nano-TiO2 are used at 2-5 parts; and thermal conductivity enhancers including graphene powder are used at 0.5-1 parts.
3. A method for preparing a high-efficiency anti-adhesion sand casting coating, applied to the high-efficiency anti-adhesion sand casting coating according to any one of claims 1 and 2, characterized in that, Includes the following steps: S1. Raw material pretreatment and batching: Weigh the materials according to the formula, then perform preliminary treatment through a drying and submerging equipment, and then weigh the additives according to the proportion for later use. S2, Liquid phase preparation: The weighed materials are added to a stirred tank. First, bio-based ethanol and inorganic silicate binder are added, and then super-dispersant, thickener, leveling agent and dispersant are added in sequence. S3. Dry and wet mixing: Then, the pretreated refractory filler is put into a high-speed dry mixer, and then gradually poured into the liquid phase system. Then, it is dispersed and stirred again by a shearing machine. S4. Additives and homogenization: Then, add the previously prepared additives in sequence and grind them using a sand mill or ball mill. Grinding is used to make the additives uniform. S5. Vacuum degassing and rheological adjustment: The slurry is degassed under vacuum to remove air bubbles and improve construction stability. The viscosity is measured with a rotational viscometer. If necessary, the viscosity is adjusted by adjusting the proportion of bio-based ethanol or additives. The shear properties are tested with a rheometer. Finally, undispersed particles are removed through a filter screen and stored.
4. The method for preparing a high-efficiency anti-sticking sand casting coating according to claim 3, characterized in that: In S1, the drying temperature of the drying equipment is 100-120℃, and the drying time is 2-3 hours. After drying, the material is ball-milled or air-jet pulverized to 10-50μm to prevent agglomeration and improve dispersibility.
5. The method for preparing a high-efficiency anti-sticking sand casting coating according to claim 3, characterized in that: In step S2, when adding bio-based ethanol and inorganic silicate binder, the stirring time is 15-20 minutes, and the stirring speed is 150-200 rpm until completely dissolved. When adding superdispersant, thickener, leveling agent and dispersing aid, the stirring speed is 200-250 rpm. Specifically, the superdispersant is added first and stirred for 1-2 minutes, and then the thickener, leveling agent and dispersing aid are added and stirred for another 10-15 minutes to form a stable and uniform liquid phase system until it is uniformly stirred.
6. The method for preparing a high-efficiency anti-sticking sand casting coating according to claim 3, characterized in that: In S3, the high-speed dry mixer is used for 10-15 minutes of mixing, and the shearing machine is a high-speed shearing machine with a speed of 1000-3000 rpm and a mixing time of 20-30 minutes. The high-speed shearing machine is used to fully wet and evenly disperse the particles.
7. The method for preparing a high-efficiency anti-sticking sand casting coating according to claim 3, characterized in that: In S4, the particle size after grinding is 10-50 μm. The order of adding the additives is as follows: first, add the antioxidant and stir for 5-8 minutes at a speed of 300-500 rpm; second, add the microcapsule phase change material and stir for 10-15 minutes at a speed of 800-1000 rpm; then add the boron nitride powder and stir for 12-18 minutes at a speed of 1000-1200 rpm; then add the functionalized nanoparticles and stir for 5-8 minutes at a speed of 800-1200 rpm; finally, add the graphene powder and stir for 15-20 minutes at a speed of 1200-1500 rpm until the mixture is uniform.
8. The method for preparing a high-efficiency anti-sticking sand casting coating according to claim 3, characterized in that: In S5, during the vacuum degassing process, when the initial volume of the slurry is greater than 100L, the degassing time is selected as 15-20 minutes; when the initial volume of the slurry is less than or equal to 100L, the degassing time is selected as 10-15 minutes. When measuring viscosity with a rotational viscometer, a rotor with a diameter of 20-30mm is selected, and the rotation speed is set to 50-100 rpm. If the measured viscosity value is less than 500mPas, the proportion of thickener is increased first. For each 0.1 part thickener added, the viscosity is measured again until the viscosity reaches the target range. If the measured viscosity value is greater than 1500mPas, the amount of bio-based ethanol is increased first. Each time 0.5-1 part bio-based ethanol is added, the viscosity is measured again. The filter screen uses a 200-250 mesh stainless steel screen to filter out undispersed particles. The storage is carried out by placing it in a sealed container and maintaining it in a dry environment at 5-25℃.