Polishing process of resin handicraft

Abstract

The invention relates to the field of resin handicraft polishing, in particular to a resin handicraft polishing process which comprises the following steps: S1, a pretreatment stage: carrying out steam cleaning on the surface of a resin handicraft to remove dust particles on the surface; s2, a polishing stage: adopting a polishing solution prepared by mixing aluminum oxide polishing powder and water, and polishing the resin handicraft through a Lauer polishing machine; s3, a coating stage: coating the surface of the resin handicraft with light-cured resin; s4, a surface modification stage: spraying a protective layer containing a fluorine-containing silane coupling agent on the surface of the resin handicraft to form a hydrophobic film with the thickness of 0.1-0.5 mu m; and S5, final inspection: detecting that the surface glossiness is greater than or equal to 90GU by adopting a glossiness meter, detecting that the hydrophobic angle is greater than or equal to 110 degrees by adopting a contact angle measuring instrument, and detecting that Ra is less than or equal to 0.1 mu m by adopting a surface roughness meter. The technical problems that when an existing resin handicraft adopts a mechanical polishing mode, the polishing effect is poor, and dust is large are solved.

Description

Technical Field

[0001] This invention relates to the field of polishing resin crafts, and more particularly to a polishing process for resin crafts. Background Technology

[0002] During the production of resin handicrafts, surface imperfections such as scratches, burrs, roughness, and unevenness often exist. These imperfections not only affect the aesthetics of the handicrafts but may also reduce their quality and value. Polishing can achieve a smooth, flat, and glossy surface for resin handicrafts, meeting consumers' demands for high-quality handicrafts.

[0003] Currently, the polishing method for resin crafts mainly adopts mechanical polishing. For example, Chinese Patent Publication No. CN113478366A discloses a resin polishing device and polishing method, which includes: a worktable with two support plates symmetrically arranged on it, and a first electric telescopic rod installed on the support plate, and a movable plate installed on the upper end of the first electric telescopic rod, the movable plate being in close contact with the support plate; a first motor placed on the movable plate, and the output end of the first motor being connected to a second rotating screw, the second rotating screw forming a rotating mechanism with the movable plate through a bearing installed on the movable plate; and a first slider connected to the second rotating screw through a threaded hole at its upper end.

[0004] Traditional mechanical polishing relies primarily on friction, which is insufficient for completely removing minute scratches and surface unevenness. Especially when processing resin crafts with complex shapes, polishing tools struggle to reach corners and edges, resulting in unsatisfactory polishing results and lingering surface imperfections. Furthermore, mechanical polishing generates significant amounts of dust, which not only pollutes the working environment but may also harm the health of operators. Additionally, dust can adhere to the surface of resin crafts, affecting subsequent coating and surface modification processes and reducing the final product quality. Summary of the Invention

[0005] Therefore, in view of the above problems, the present invention proposes a polishing process for resin handicrafts, which solves the technical problems of poor polishing effect and large amount of dust when using mechanical polishing methods for existing resin handicrafts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A polishing process for resin handicrafts includes the following steps: S1. Pre-treatment stage: Steam cleaning is performed on the surface of the resin crafts at a temperature of 85℃-110℃ to remove dust particles from the surface of the resin crafts. S2, Polishing stage: A polishing slurry made of alumina polishing powder and water is used to polish the resin crafts using a Raul polishing machine. The Raul polishing machine pressure is set to 0.3 bar-0.5 bar, the motor frequency to 48 Hz-52 Hz, the polishing slurry temperature to 10 ℃-15 ℃, and the polishing time to 3 minutes-8 minutes. S3. Coating stage: Apply UV-curable resin to the surface of the resin craft. The viscosity of the UV-curable resin is 150 MPa·s-200 MPa·s. Irradiate with a UV-curing lamp for 200s-240s. The density after UV curing is 1.05 g / cm³-1.13 g / cm³. S4. Surface modification stage: A protective layer containing fluorinated silane coupling agent is sprayed onto the surface of the resin craft. After the protective layer is cured, a hydrophobic film with a thickness of 0.1μm-0.5μm is formed. S5. Final inspection: The surface gloss is measured to be ≥90GU using a gloss meter, the hydrophobic angle is measured to be ≥110° using a contact angle meter, and the surface roughness is measured to be Ra≤0.1μm using a surface roughness meter.

[0007] Furthermore, the preparation method of the alumina polishing powder includes: S21. Mix the first pseudoboehmite with aluminum nitrate in water or alcohol to form a colloidal mixture. The mass of aluminum nitrate added accounts for 1.0%-4.0% of the mass of the first pseudoboehmite, so as to promote the uniformity and stability of the colloidal mixture. S22. Mix the gel-like mixture with the second pseudoboehmite evenly, let it stand for 5-20 hours to fully dissolve the gel, and then dry it to obtain the intermediate to be calcined; S23. The intermediate to be calcined is calcined at 1000℃-1060℃, and the specific surface area of ​​the material after calcination is controlled to be 15 m² / g-20 m² / g, so as to prepare alumina polishing powder with the expected particle size. The total amount of the first pseudoboehmite and the second pseudoboehmite is calculated as 100% by mass, with the first pseudoboehmite accounting for 7%-15% and the second pseudoboehmite accounting for 85%-93%.

[0008] Furthermore, in the polishing stage, the method for preparing the polishing liquid includes: wet ball milling the intermediate to be calcined until the D50 is 1.5μm-2.5μm and the D97 is less than 12μm; Sodium hexametaphosphate is added to the ball-milled material and mixed well. The amount of sodium hexametaphosphate added is 0.2%-2% of the ball-milled material. The mixture is then freeze-dried to produce alumina polishing powder with the desired particle size, so as to improve polishing efficiency and surface quality.

[0009] Furthermore, in the coating stage, the resin craft is electrostatically treated before coating to give it a positive or negative charge, and then the resin craft is vibrated to make the UV-cured resin spread evenly and remove excess UV-cured resin.

[0010] Furthermore, the coating stage is carried out in a constant temperature and humidity environment, with the ambient temperature controlled at 20℃-25℃ and the relative humidity at 40%-60%. When the resin craft is irradiated by the light curing lamp, it is in a plasma atmosphere to reduce the impact of electrostatic discharge on the light curing quality.

[0011] Furthermore, an intermediate cleaning step is added between the polishing stage and the coating stage: The cleaning process involves spraying deionized water at a temperature of 40℃-60℃, a spray pressure of 0.1MPa-0.3MPa, and a cleaning time of 2-5 minutes. Alternatively, place the resin crafts in a plasma atmosphere for 30-60 seconds.

[0012] Furthermore, the polishing wheel of the Raul polishing machine is made of polyurethane with a Shore A60-A80 hardness and has a spiral guide groove on its surface with a groove depth of 0.5mm-1.5mm.

[0013] Furthermore, the fluorosilane coupling agent in the surface modification stage is composed of the following components in the following mass ratio: 5%-15% perfluorooctyltriethoxysilane, 80%-90% anhydrous ethanol, 1%-5% glacial acetic acid, and 0.5%-3% nano-additives, wherein the nano-additives are composite particles composed of nano-titanium dioxide and nano-silica.

[0014] Furthermore, the protective layer in the surface modification stage is applied using electrostatic spraying, which atomizes the fluorinated silane coupling agent and imparts it with a positive or negative charge. This atomized agent is then applied to the grounded resin craft surface to improve the uniformity and adhesion of the protective layer.

[0015] Furthermore, after the spraying is completed, the resin crafts are placed in a curing chamber equipped with ultraviolet lamps and heating devices for curing. First, it is pre-cured under ultraviolet light with a wavelength of 365nm, with an energy density of 200mJ / cm²-500mJ / cm² and an irradiation time of 10min-20min; Then turn on the heating device and raise the temperature to 50℃-70℃. Keep it at that temperature for 30min-60min to allow the protective layer to fully solidify and form a stable hydrophobic film. Finally, a flexible polyester fiber cloth with polishing fluid is used to polish the surface of the protective layer for 1-3 minutes under a pressure of 0.1-0.2 bar and a rotation speed of 100-300 rpm to further improve the smoothness and flatness of the protective layer surface.

[0016] By adopting the aforementioned technical solution, the beneficial effects of the present invention are: 1. The polishing process of this resin craft involves multiple steps. The pretreatment stage, steam cleaning, effectively removes surface dust particles, providing a clean surface for subsequent polishing. The polishing stage uses a specific ratio of polishing fluid and appropriate polishing parameters to significantly improve the surface quality of the resin craft. The coating stage uses a UV-curable resin of a specific viscosity and controls the light exposure time to achieve excellent UV curing results. The surface modification stage forms a hydrophobic film, enhancing the craft's hydrophobic properties. Finally, the final inspection uses various instruments to test different indicators, ensuring that the surface quality of the craft reaches a high standard. The overall process comprehensively improves the appearance and performance of the resin craft.

[0017] 2. The preparation method of this alumina polishing powder, by controlling the addition ratio of aluminum nitrate, promotes the uniformity and stability of the colloidal mixture; by rationally allocating the feeding amount of the first and second pseudoboehmite, and through steps such as full gelation, drying, and calcination, the specific surface area of ​​the calcined material can be precisely controlled, and alumina polishing powder with the expected particle size can be obtained, which helps to improve the performance of the polishing powder and thus enhance the polishing effect of resin crafts.

[0018] 3. In the polishing liquid preparation method, the calcined alumina polishing powder is wet-milled to a specific particle size range and the D97 size is controlled to ensure the uniformity and appropriate particle size of the polishing powder particles; the addition of sodium hexametaphosphate and freeze-drying can further improve the polishing efficiency and surface quality, so that the resin crafts can obtain a smoother surface after polishing.

[0019] 4. Before the coating stage, the resin crafts are electrostatically treated and vibrated. After the resin crafts are charged, the photocurable resin can be more evenly diffused on the surface of the crafts due to the electrostatic effect. At the same time, the vibration can remove excess photocurable resin, ensuring the uniformity and thickness consistency of the coating and improving the coating quality.

[0020] 5. The coating stage is carried out in a constant temperature and humidity environment, which can reduce the impact of environmental factors on the performance of the UV-cured resin; when the UV curing lamp is irradiated, the resin crafts are placed in a plasma atmosphere, which can effectively reduce the impact of electrostatic discharge on the UV curing quality, ensure the stable progress of the UV curing process, and improve the UV curing quality.

[0021] 6. Adding an intermediate cleaning step between the polishing and coating stages, using deionized water spray cleaning or placing the product in a plasma atmosphere, can further remove surface static electricity and microparticles, preventing these impurities from affecting the adhesion and uniformity of the subsequent protective layer, thereby improving the performance of the protective layer and better protecting the surface of the resin crafts.

[0022] 7. The Raul polishing machine uses a polishing wheel made of polyurethane material with a specific hardness and has a spiral guide groove. During the polishing process, the appropriate hardness can ensure effective polishing of resin crafts without excessive wear on the surface of the crafts. The guide groove can promptly discharge the debris and excess polishing liquid generated during polishing, improving polishing efficiency and ensuring polishing quality.

[0023] 8. The protective layer in the surface modification stage is composed of components in a specific mass ratio. Perfluorooctyltriethoxysilane gives the protective layer good hydrophobic properties; anhydrous ethanol is used as a solvent; glacial acetic acid can adjust the pH value of the solution and promote the uniform mixing of the components; nano additives (composite particles composed of nano titanium dioxide and nano silica) can enhance the strength, wear resistance and other properties of the protective layer, and comprehensively improve the protective effect of the protective layer on the surface of resin crafts.

[0024] 9. In the surface modification stage, electrostatic spraying is used to atomize and charge the fluorinated silane coupling agent before applying it to the grounded resin craft surface. Utilizing the principle of electrostatic adsorption, the protective layer can be more evenly attached to the resin craft surface, improving the uniformity and adhesion of the protective layer and enhancing the protective effect.

[0025] 10. After spraying, the resin crafts are cured. First, they are initially cured under ultraviolet light of a specific wavelength, with the energy density and irradiation time controlled to allow the protective layer to initially take shape. Then, they are heated and kept warm to fully cure the protective layer and form a stable hydrophobic film. Finally, the surface of the protective layer is polished with a flexible polyester fiber cloth under specific conditions to further improve the smoothness and flatness of the protective layer surface, making the surface quality of the resin crafts even better. Attached Figure Description

[0026] Figure 1 This is a process flow diagram of the present invention.

[0027] Figure 2 This is a process flow diagram of the preparation method of alumina polishing powder. Detailed Implementation

[0028] The present invention will now be further described in conjunction with specific embodiments.

[0029] This embodiment provides a polishing process for resin handicrafts, including the following steps: S1. Pre-treatment stage: Steam cleaning is performed on the surface of the resin crafts at a temperature of 85℃-110℃ to remove dust particles from the surface of the resin crafts. S2, Polishing stage: A polishing slurry made of alumina polishing powder and water is used to polish the resin crafts using a Raul polishing machine. The Raul polishing machine pressure is set to 0.3 bar-0.5 bar, the motor frequency to 48 Hz-52 Hz, the polishing slurry temperature to 10 ℃-15 ℃, and the polishing time to 3 minutes-8 minutes. S3. Coating stage: Apply UV-curable resin to the surface of the resin craft. The viscosity of the UV-curable resin is 150 MPa·s-200 MPa·s. Irradiate with a UV-curing lamp for 200s-240s. The density after UV curing is 1.05 g / cm³-1.13 g / cm³. S4. Surface modification stage: A protective layer containing fluorinated silane coupling agent is sprayed onto the surface of the resin craft. After the protective layer is cured, a hydrophobic film with a thickness of 0.1μm-0.5μm is formed. S5. Final inspection: The surface gloss is measured to be ≥90GU using a gloss meter, the hydrophobic angle is measured to be ≥110° using a contact angle meter, and the surface roughness is measured to be Ra≤0.1μm using a surface roughness meter.

[0030] The above numerical ranges can be selected according to actual needs. Steam temperature can be 85℃, 90℃, 95℃, 100℃, 105℃, or 110℃. Pressure can be 0.3 bar, 0.35 bar, 0.4 bar, 0.45 bar, or 0.5 bar. Motor frequency can be 48Hz, 49Hz, 50Hz, 51Hz, or 52Hz. Polishing fluid temperature can be 10℃, 11℃, 12℃, 13℃, 14℃, or 15℃. Polishing time can be 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes, or 8 minutes. UV-curable resin viscosity can be 150 MPa·s, 160 MPa·s, 170 MPa·s, 180 MPa·s, 190 MPa·s, or 200 MPa·s. UV curing lamp irradiation time can be 200s, 210s, 220s, 230s, or 240s. The density after photocuring can be 1.05 g / cm³, 1.07 g / cm³, 1.09 g / cm³, 1.11 g / cm³, or 1.13 g / cm³. The protective layer thickness can be 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, or 0.5 μm. The surface gloss can be 90 GU, 95 GU, 100 GU, or higher. The hydrophobic angle can be 110°, 115°, 120°, or higher. The surface roughness Ra can be 0.1 μm, 0.09 μm, 0.08 μm, or lower.

[0031] The method for preparing the alumina polishing powder includes: S21. Mixing: The first pseudoboehmite and aluminum nitrate are mixed in water or alcohol to form a colloidal mixture. The mass of aluminum nitrate added accounts for 1.0%-4.0% of the mass of the first pseudoboehmite to promote the uniformity and stability of the colloidal mixture. S22. Let stand, mix the gel-like mixture with the second pseudoboehmite evenly, let stand for 5-20 hours to fully dissolve the gel, and then dry to obtain the intermediate to be calcined; S23. Calcination: The intermediate to be calcined is calcined at 1000℃-1060℃, and the specific surface area of ​​the material after calcination is controlled to be 15 m² / g-20 m² / g, to obtain alumina polishing powder with the desired particle size. The alumina polishing powder can also be mixed with additives such as dispersants, suspending agents, lubricants, co-solvents, or reinforcing and toughening agents. The total amount of the first pseudoboehmite and the second pseudoboehmite is calculated as 100% by mass, with the first pseudoboehmite accounting for 7%-15% and the second pseudoboehmite accounting for 85%-93%.

[0032] Dispersants, suspending agents, lubricants, cosolvents, or reinforcing and toughening agents can all be selected from conventional additives, such as polyethylene glycol, alkylamines, stearic acid, graphite, titanium dioxide, yttrium oxide, silicon carbide, boron nitride, rare earth oxides, chromium oxide, or cobalt oxide.

[0033] The mass percentage of aluminum nitrate added can be 1.0%, 2.0%, 3.0%, or 4.0%. The settling time can be 5 hours, 10 hours, 15 hours, or 20 hours. The calcination temperature can be 1000℃, 1020℃, 1040℃, 1050℃, or 1060℃. The specific surface area can be 15 m² / g, 16 m² / g, 17 m² / g, 18 m² / g, 19 m² / g, or 20 m² / g. The percentage of the first pseudoboehmite can be 7%, 9%, 11%, 13%, or 15%. The percentage of the second pseudoboehmite can be 85%, 87%, 89%, 91%, or 93%.

[0034] Furthermore, in the polishing stage, the preparation method of the polishing liquid also includes: calcining the intermediate and then wet ball milling it until the D50 is 1.5μm-2.5μm and the D97 is less than 12μm; adding sodium hexametaphosphate to the ball-milled material, mixing it evenly, the amount of sodium hexametaphosphate added is 0.2%-2% of the ball-milled material, and then freeze-drying it to prepare alumina polishing powder with the expected particle size, so as to improve polishing efficiency and surface quality.

[0035] D50 can be 1.5μm, 1.8μm, 2.0μm, 2.2μm, or 2.5μm. D97 can be 11μm, 10μm, 9μm, or lower. The percentage of sodium hexametaphosphate added can be 0.2%, 0.5%, 1.0%, 1.5%, or 2.0%.

[0036] During the coating stage, the resin craft is electrostatically treated before coating to impart a positive or negative charge. Then, the resin craft is vibrated to ensure uniform diffusion of the UV-curable resin and to remove excess resin. The coating stage is conducted in a constant temperature and humidity environment, with the ambient temperature controlled between 20℃ and 25℃ and the relative humidity between 40% and 60%. During UV curing, the resin craft is placed in a plasma atmosphere to minimize the impact of electrostatic discharge on the UV curing quality.

[0037] The ambient temperature can be 20℃, 21℃, 22℃, 23℃, 24℃, or 25℃. The relative humidity can be 40%, 45%, 50%, 55%, or 60%.

[0038] An intermediate cleaning step is added between the polishing stage and the coating stage: Deionized water spray cleaning is used, with the water temperature controlled at 40℃-60℃, the spray pressure at 0.1MPa-0.3MPa, and the cleaning time at 2-5 minutes; or the polished resin crafts are placed in a plasma atmosphere for 30-60 seconds to further remove surface static electricity and microparticles, and improve the adhesion and uniformity of the protective layer.

[0039] The deionized water temperature can be 40℃, 45℃, 50℃, 55℃, or 60℃. The spray pressure can be 0.1MPa, 0.15MPa, 0.2MPa, 0.25MPa, or 0.3MPa. The cleaning time can be 2 minutes, 3 minutes, 4 minutes, or 5 minutes. The plasma atmosphere treatment time can be 30 seconds, 40 seconds, 50 seconds, or 60 seconds.

[0040] The polishing wheel of the Raul polishing machine is made of polyurethane with a Shore A60-A80 hardness. Its surface has spiral guide grooves with a depth of 0.5mm-1.5mm. The polishing wheel hardness can be Shore A60, A65, A70, A75, or A80. The guide groove depth can be 0.5mm, 0.8mm, 1.0mm, 1.2mm, or 1.5mm.

[0041] The fluorosilane coupling agent in the surface modification stage is composed of the following components in the following mass ratio: 5%-15% perfluorooctyltriethoxysilane, 80%-90% anhydrous ethanol, 1%-5% glacial acetic acid, and 0.5%-3% nano-additives, wherein the nano-additives are composite particles composed of nano-titanium dioxide and nano-silica.

[0042] The percentage of perfluorooctyltriethoxysilane can be 5%, 8%, 10%, 12%, or 15%. The percentage of anhydrous ethanol can be 80%, 83%, 85%, 87%, or 90%. The percentage of glacial acetic acid can be 1%, 2%, 3%, 4%, or 5%. The percentage of nano-additives can be 0.5%, 1.0%, 1.5%, 2.0%, or 3.0%. The proportions of the above components can be selected according to actual needs, and any value within the above range can meet the functional requirements of the protective layer of this solution. The ratio of nano-titanium dioxide to nano-silica in the composite particles can be adjusted according to actual needs, such as a mass ratio of 2:8, 3:7, 4:6, or 5:5.

[0043] The protective layer in the surface modification stage is applied using electrostatic spraying, which atomizes the fluorinated silane coupling agent and gives it a positive or negative charge. The atomized agent is then applied to the grounded resin craft surface to improve the uniformity and adhesion of the protective layer.

[0044] After the spraying is completed, the resin crafts are placed in a curing chamber equipped with a UV lamp and a heating device for curing. First, the protective layer is initially cured under ultraviolet light with a wavelength of 365nm, an energy density of 200mJ / cm²-500mJ / cm², and an irradiation time of 10-20 minutes. Then, the heating device is turned on to raise the temperature to 50℃-70℃ and hold it for 30-60 minutes to fully cure the protective layer and form a stable hydrophobic film. Finally, the surface of the protective layer is polished for 1-3 minutes using a flexible polyester fiber cloth with polishing fluid under a pressure of 0.1bar-0.2bar and a rotation speed of 100rpm-300rpm to further improve the smoothness and flatness of the protective layer surface.

[0045] The energy density can be 200 mJ / cm², 300 mJ / cm², 400 mJ / cm², or 500 mJ / cm². The irradiation time can be 10 min, 13 min, 15 min, 17 min, or 20 min. The heating temperature can be 50℃, 55℃, 60℃, 65℃, or 70℃. The holding time can be 30 min, 40 min, 50 min, or 60 min. The pressure can be 0.1 bar, 0.12 bar, 0.15 bar, 0.18 bar, or 0.2 bar. The rotation speed can be 100 rpm, 150 rpm, 200 rpm, 250 rpm, or 300 rpm. The polishing time can be 1 min, 1.5 min, 2 min, 2.5 min, or 3 min.

[0046] A polishing slurry made by mixing alumina polishing powder with water is used to apply physical friction and chemical action to the surface of resin crafts using a Raul polishing machine. The alumina polishing powder has suitable hardness and particle size distribution, and under certain pressure, motor frequency, and temperature conditions, it can undergo relative motion with the surface of the resin crafts, removing microscopic protrusions and imperfections to achieve a smooth surface.

[0047] The polishing fluid temperature is controlled at 10℃-15℃. Lower temperatures can reduce the heat effect during the polishing process and prevent the resin crafts from deforming or changing their properties due to excessive temperature. The setting of pressure and motor frequency affects the contact strength and relative movement speed between the polishing powder and the surface of the resin crafts, thereby controlling the polishing efficiency and quality.

[0048] This effectively removes minor imperfections and unevenness that may still exist on the surface of resin crafts after pretreatment, improves surface smoothness, provides a good base surface for subsequent coating and other processes, and ensures that the surface quality of the final product reaches a high standard.

[0049] In addition, in the preparation of polishing powder, the first pseudoboehmite and aluminum nitrate are first mixed in water or alcohol to form a colloidal mixture. The addition of aluminum nitrate can promote the uniformity and stability of the colloidal mixture, providing a good foundation for subsequent reactions.

[0050] The gel-like mixture is mixed evenly with the second pseudoboehmite and fully gelled, and then dried to obtain the intermediate to be calcined. The composition and properties of the intermediate are adjusted by controlling the feeding ratio of the first pseudoboehmite and the second pseudoboehmite.

[0051] The intermediate to be calcined is calcined at 1000℃-1060℃, controlling the specific surface area of ​​the material after calcination to be 15-20 m² / g. High-temperature calcination causes physical and chemical changes in the material, forming alumina polishing powder with specific structure and properties. Additives can further adjust the properties of the alumina polishing powder.

[0052] The calcined alumina polishing powder is wet ball-milled to control the D50 to be 1.5μm-2.5μm and the D97 to be less than 12μm, so that the alumina polishing powder achieves a suitable particle size distribution. Sodium hexametaphosphate is added and mixed evenly before freeze-drying to prevent particle agglomeration and produce alumina polishing powder with the expected particle size, thereby improving the dispersibility and polishing performance of the polishing powder.

[0053] An alumina polishing powder with suitable particle size distribution, high specific surface area and good dispersibility was prepared. This alumina polishing powder can better contact the surface of resin crafts during the polishing process, improve polishing efficiency, reduce excessive wear on the surface of resin crafts, obtain a high-quality polished surface, and meet the surface smoothness requirements of resin crafts.

[0054] A UV-curable resin is applied to the polished surface of a resin craft. Then, it is irradiated with light of a specific wavelength emitted by a UV-curing lamp, triggering a chemical reaction in the photoinitiator within the resin, causing the resin to cure rapidly. The viscosity of the UV-curable resin is controlled between 150 mPa·s and 200 mPa·s; this suitable viscosity helps ensure uniform coating on the craft surface.

[0055] Before coating, the resin crafts are electrostatically treated to give them a positive or negative charge. This electrostatic adsorption helps the UV-cured resin adhere better to the surface of the crafts. Vibrating the resin crafts allows the UV-cured resin to spread evenly and removes excess resin, ensuring a uniform coating thickness.

[0056] Coating is performed in a constant temperature and humidity environment, with the ambient temperature controlled at 20℃-25℃ and the relative humidity at 40%-60%, which can reduce the impact of environmental factors on the performance of the photocurable resin. When the resin craft is irradiated by the photocuring lamp, it is in a plasma atmosphere, which can reduce the impact of electrostatic discharge on the photocuring quality, ensure the stable progress of the photocuring process, and form a high-quality cured coating.

[0057] To ensure uniform coating of the UV-cured resin on the surface of the resin crafts, avoid problems such as uneven coating thickness and sagging, and improve coating quality; reduce the adverse effects of external environmental factors and electrostatic discharge on the UV curing process, ensure that the UV-cured resin is fully cured, form a cured layer with good performance, and enhance the surface hardness and wear resistance of the resin crafts.

[0058] In addition, the protective layer is applied using electrostatic spraying during the surface modification stage. This atomizes the fluorinated silane coupling agent and imparts it with a positive or negative charge. By utilizing the principle of electrostatic adsorption, the atomized fluorinated silane coupling agent is evenly coated onto the grounded resin craft surface, thereby improving the uniformity and adhesion of the protective layer.

[0059] After spraying, the resin crafts are placed in a curing chamber equipped with ultraviolet lamps and heating devices for curing. First, they are initially cured under ultraviolet light with a wavelength of 365nm, causing some components in the protective layer to undergo a chemical reaction to form a preliminary cured structure. Then, the heating device is turned on to raise the temperature and maintain the temperature, allowing the protective layer to fully cure and form a stable hydrophobic film.

[0060] Finally, a flexible polyester fiber cloth with polishing fluid is used to polish the surface of the protective layer under specific pressure and rotation speed conditions, further improving the smoothness and flatness of the protective layer surface, so that the protective layer not only has good hydrophobic properties, but also has a smooth surface appearance.

[0061] To improve the uniformity and adhesion of the fluorinated silane coupling agent protective layer on the surface of resin crafts, ensuring that the protective layer can firmly adhere to the surface of the resin crafts and effectively exert its hydrophobic and other protective functions; through reasonable curing treatment and subsequent polishing, the protective layer forms a stable and smooth structure, improving the overall quality and performance of the surface of the resin crafts and meeting the product's requirements for surface hydrophobicity and appearance quality.

[0062] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A polishing process for resin handicrafts, characterized in that, Includes the following steps: S1. Pre-treatment stage: Steam cleaning is performed on the surface of the resin crafts at a temperature of 85℃-110℃ to remove dust particles from the surface of the resin crafts. S2, Polishing stage: A polishing slurry made of alumina polishing powder and water is used to polish the resin crafts using a Raul polishing machine. The Raul polishing machine pressure is set to 0.3 bar-0.5 bar, the motor frequency to 48 Hz-52 Hz, the polishing slurry temperature to 10 ℃-15 ℃, and the polishing time to 3 minutes-8 minutes. S3. Coating stage: Apply UV-curable resin to the surface of the resin craft. The viscosity of the UV-curable resin is 150 MPa·s-200 MPa·s. Irradiate with a UV-curing lamp for 200s-240s. The density after UV curing is 1.05 g / cm³-1.13 g / cm³. S4. Surface modification stage: A protective layer containing fluorinated silane coupling agent is sprayed onto the surface of the resin craft. After the protective layer is cured, a hydrophobic film with a thickness of 0.1μm-0.5μm is formed. S5. Final inspection: The surface gloss is measured to be ≥90GU using a gloss meter, the hydrophobic angle is measured to be ≥110° using a contact angle meter, and the surface roughness is measured to be Ra≤0.1μm using a surface roughness meter.

2. The polishing process for resin handicrafts according to claim 1, characterized in that, The preparation method of the alumina polishing powder includes: S21. Mix the first pseudoboehmite with aluminum nitrate in water or alcohol to form a colloidal mixture. The mass of aluminum nitrate added accounts for 1.0%-4.0% of the mass of the first pseudoboehmite, so as to promote the uniformity and stability of the colloidal mixture. S22. Mix the gel-like mixture with the second pseudoboehmite evenly, let it stand for 5-20 hours to fully dissolve the gel, and then dry it to obtain the intermediate to be calcined; S23. The intermediate to be calcined is calcined at 1000℃-1060℃, and the specific surface area of ​​the material after calcination is controlled to be 15m² / g-20m² / g, so as to prepare alumina polishing powder with the expected particle size. The total amount of the first pseudoboehmite and the second pseudoboehmite is calculated as 100% by mass, with the first pseudoboehmite accounting for 7%-15% and the second pseudoboehmite accounting for 85%-93%.

3. The polishing process for resin handicrafts according to claim 2, characterized in that, In the polishing stage, the polishing liquid is prepared by: wet ball milling the intermediate to be calcined until the D50 is 1.5μm-2.5μm and the D97 is less than 12μm; Sodium hexametaphosphate is added to the ball-milled material and mixed well. The amount of sodium hexametaphosphate added is 0.2%-2% of the ball-milled material. The mixture is then freeze-dried to produce alumina polishing powder with the desired particle size, so as to improve polishing efficiency and surface quality.

4. The polishing process for resin handicrafts according to claim 1, characterized in that, During the coating stage, the resin craft is electrostatically treated before coating to give it a positive or negative charge. Then, the resin craft is vibrated to make the UV-cured resin spread evenly and remove excess UV-cured resin.

5. The polishing process for resin handicrafts according to claim 1, characterized in that, The coating stage is carried out in a constant temperature and humidity environment, with the ambient temperature controlled at 20℃-25℃ and the relative humidity at 40%-60%. When the resin crafts are irradiated by the light curing lamp, they are in a plasma atmosphere to reduce the impact of electrostatic discharge on the light curing quality.

6. The polishing process for resin handicrafts according to claim 1, characterized in that, An intermediate cleaning step is added between the polishing stage and the coating stage: The cleaning process involves spraying deionized water at a temperature of 40℃-60℃, a spray pressure of 0.1MPa-0.3MPa, and a cleaning time of 2-5 minutes. Alternatively, place the resin crafts in a plasma atmosphere for 30-60 seconds.

7. The polishing process for resin handicrafts according to claim 1, characterized in that, The polishing wheel of the Raul polishing machine is made of polyurethane with a Shore A60-A80 hardness and has spiral guide grooves on its surface with a groove depth of 0.5mm-1.5mm.

8. The polishing process for resin handicrafts according to claim 1, characterized in that, The fluorosilane coupling agent in the surface modification stage is composed of the following components in the following mass ratio: 5%-15% perfluorooctyltriethoxysilane, 80%-90% anhydrous ethanol, 1%-5% glacial acetic acid, and 0.5%-3% nano-additives, wherein the nano-additives are composite particles composed of nano-titanium dioxide and nano-silica.

9. The polishing process for resin handicrafts according to claim 8, characterized in that, The protective layer in the surface modification stage is applied using electrostatic spraying, which atomizes the fluorinated silane coupling agent and gives it a positive or negative charge. The atomized agent is then applied to the grounded resin craft surface to improve the uniformity and adhesion of the protective layer.

10. The polishing process for a resin craft according to claim 9, characterized in that, After the spraying is completed, the resin crafts are placed in a curing chamber equipped with a UV lamp and a heating device for curing. First, it is pre-cured under ultraviolet light with a wavelength of 365nm, with an energy density of 200mJ / cm²-500mJ / cm² and an irradiation time of 10min-20min; Then turn on the heating device and raise the temperature to 50℃-70℃. Keep it at that temperature for 30min-60min to allow the protective layer to fully solidify and form a stable hydrophobic film. Finally, a flexible polyester fiber cloth with polishing fluid is used to polish the surface of the protective layer for 1-3 minutes under a pressure of 0.1-0.2 bar and a rotation speed of 100-300 rpm to further improve the smoothness and flatness of the protective layer surface.

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