Water-based environment-friendly cleaning solution for 3D printing dental cast as well as preparation method and application of water-based environment-friendly cleaning solution

Abstract

The embodiment of the invention provides a water-based environment-friendly cleaning solution for a 3D printing dental cast as well as a preparation method and application of the water-based environment-friendly cleaning solution. The water-based environment-friendly cleaning solution for the 3D printing dental cast is prepared from the following components in percentage by mass: 70 to 90 percent of deionized water, 10 to 25 percent of organic solvent complex liquid, 1.5 to 6.5 percent of surfactant, 1.1 to 2.7 percent of pH buffer agent, 1 to 5 percent of zirconium oxide nano particles and 0.05 to 0.5 percent of stabilizer. The water-based environment-friendly cleaning fluid for the 3D printing dental cast has efficient cleaning capacity, the single-time cleaning amount can reach 75 dental cast / L, a good cleaning effect can still be kept after the cleaning fluid is recycled for 10 times, and it can be guaranteed that the dental cast does not have the swelling deformation problem. The flash point of the water-based environment-friendly cleaning fluid for the 3D printing dental cast is larger than 100 DEG C, flammable and explosive risks do not exist, the VOC emission amount is lower than 50 g / L, environmental protection laws and regulations are met, in addition, the cost is low, and large-scale production and application are convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cleaning, in particular to a 3D printed dental model water-based environment-friendly cleaning solution. BACKGROUND

[0002] With the popularization of digital oral medical treatment, 3D printed dental models have become a core link of denture manufacturing and orthodontic scheme design. The printing precision of dental models based on light solidification (SLA / DLP) and fused deposition (FDM) technology can reach microns, but the un-solidified resin, dust and support structure remaining on the surface thereof need to be completely removed through a special cleaning solution, otherwise the yield of products in subsequent processes such as bonding and coloring will be affected.

[0003] At present, the conventional cleaning solution is an organic solution cleaning solution, especially alcohol solvents dominate. The traditional alcohol solvents (such as anhydrous ethanol and isopropyl alcohol) have a flash point lower than 20℃, and the cleaning workshop needs to be strictly managed for explosion prevention, safety accidents occur frequently, the number of dental models that can be cleaned is limited, the solvents cannot be recycled, the waste liquid needs to be disposed as hazardous waste, and the comprehensive cost is high.

[0004] In view of the problems existing in the prior art, it is necessary to develop a new type of 3D printed dental model water-based environment-friendly cleaning solution.

[0005] It should be noted that the above content is not necessarily prior art, and is not used to limit the patent protection scope of the present application. SUMMARY

[0006] The embodiments of the present application provide a 3D printed dental model water-based environment-friendly cleaning solution, a preparation method and application thereof, so as to solve or alleviate one or more technical problems proposed above.

[0007] The first aspect of the embodiments of the present application provides a 3D printed dental model water-based environment-friendly cleaning solution, which comprises: deionized water with a mass percentage of 75-90%, an organic solvent composite liquid with a mass percentage of 10-25%, a surfactant with a mass percentage of 1.5-6.5%, a pH buffer with a mass percentage of 1.1-2.7%, zirconium oxide nanoparticles with a mass percentage of 1-5%, and a stabilizer with a mass percentage of 0.05-0.5%.

[0008] Optionally, the organic solvent composite liquid comprises a combination of cyclohexane, ethyl acetate, triethylene glycol dimethyl acrylate, hydroxyethyl methacrylate and ethanol. Optionally, based on 100% of the mass percentage of the organic solvent composite liquid, the organic solvent composite liquid comprises cyclohexane with a mass percentage of 30-40%, ethyl acetate with a mass percentage of 10-25%, triethylene glycol dimethyl acrylate with a mass percentage of 5-15%, hydroxyethyl methacrylate with a mass percentage of 5-15%, and ethanol with a mass percentage of 1-5%.

[0009] Optionally, the surfactant comprises sodium dodecyl benzene sulfonate and sodium laureth sulfate; Optionally, the surfactant comprises sodium dodecyl benzene sulfonate and sodium laureth sulfate in a mass percentage of 1-5% and 0.5-1.5%, respectively.

[0010] Optionally, the pH buffer comprises a combination of sodium hydroxide and sodium bicarbonate in a mass percentage of 0.1-0.7% and 1-2%, respectively.

[0011] Optionally, the pH buffer has a pH of 8.5-9.5.

[0012] Optionally, the zirconium oxide nanoparticles have an average particle size of 50-100 nm. The stabilizer is a combination of 2,6-di-tert-butyl-p-cresol and p-methoxyphenol in a mass ratio of 1:(0.5-1.5).

[0013] In a second aspect, the embodiments of the present application provide a preparation method of the 3D printing dental model water-based environmentally friendly cleaning solution of the first aspect, and the preparation method comprises the following steps: (1) Under stirring, 75-90% of deionized water, 1.5-6.5% of surfactant, and 1.1-2.7% of pH buffer are mixed at 50-60°C for 0.5-2 h, and then 1-3% of ethanol is added and mixed for 10-20 min to obtain an aqueous phase; (2) Under stirring, the rest of the organic solvent composite liquid and 0.05-0.5% of stabilizer are mixed at 40-50°C for 10-30 min, and then 1-5% of zirconium oxide nanoparticles are ultrasonically treated for 20-40 min to obtain an organic phase; (3) Under stirring and ultrasonic conditions, the aqueous phase obtained in step (1) and the organic phase obtained in step (2) are mixed at 40-50°C for 20-100 min to obtain the 3D printing dental model water-based environmentally friendly cleaning solution.

[0014] Optionally, the stirring rate in step (1) is 500-2000 rpm. Optionally, the stirring rate in step (2) is 500-2000 rpm. Optionally, the ultrasonic frequency in step (2) is 30-50 KHz. Optionally, the stirring rate in step (3) is 500-2000 rpm. Optionally, the ultrasonic frequency in step (3) is 30-50 KHz.

[0015] In a third aspect, the 3D printing dental mold water-based environment-friendly cleaning solution of the first aspect is used for cyclic cleaning of the dental mold.

[0016] Optionally, the device for cyclic cleaning comprises a reaction unit, a light curing unit, a filtration unit and an intelligent control unit connected in sequence. The reaction unit comprises a reaction tank and a stirring system. The light curing unit comprises a double light source UV-LED array. The filtration unit is a three-stage gradient filtration unit comprising a first filtration unit with a filtration particle size of 40-60 mesh, a second filtration unit with a filtration particle size of 100-200 mesh and a third filtration unit with a filtration particle size of 250-350 mesh.

[0017] Optionally, the method for cyclic cleaning comprises: (1) After 70-80 dental molds are cleaned with the cleaning solution, the temperature of the waste liquid after cleaning is controlled to be 25-50℃, and the waste liquid is stirred at a stirring rate of 400-600 rpm for 5-15 min, and then the waste liquid is subjected to ultraviolet irradiation at a temperature of 30-40℃ for 20-90 s, so that the resin impurities generated during cleaning of the dental mold are cross-linked and solidified, and a mixed liquid is obtained. (2) The mixed liquid obtained in step (1) is gradiently filtered to obtain a filtrate, and the filtrate is supplemented with cleaning solution for further cleaning.

[0018] The technical solutions of the embodiments of the present application can have the following advantages: The 3D printing dental mold water-based environment-friendly cleaning solution has high cleaning efficiency, and the single cleaning capacity can reach 75 dental molds / L, and the dental mold can be prevented from swelling and deforming.

[0019] The 3D printing dental mold water-based environment-friendly cleaning solution has a flash point greater than 100℃, no risk of flammability and explosion, and a VOC emission of less than 50g / L, which meets environmental protection regulations. In addition, the cost is low, and it is convenient for large-scale production and application.

[0020] The 3D printing dental mold water-based environment-friendly cleaning solution in the present application can be recycled for not less than 10 times through the light curing waste liquid regeneration technology, and the cleaning efficiency can still be maintained at more than 93% after at least 10 cycles. BRIEF DESCRIPTION OF DRAWINGS

[0021] In the drawings, identical reference numerals designate identical or similar parts throughout the several views. The drawings are not necessarily to scale. It should be understood that the drawings only depict some embodiments in accordance with the present disclosure and should not be considered limiting of the scope of the disclosure.

[0022] Figure 1The structure schematic diagram of the circulating cleaning device used for the 3D printing dental mold water-based environment-friendly cleaning liquid provided by the embodiment 1 of the present application for the circulating cleaning of the dental mold. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. In the drawings, the size and relative sizes of layers, regions, elements, and the like can be exaggerated for clarity. The same or similar elements or elements having the same or similar functions are denoted by the same reference numerals throughout the drawings. The embodiments described below by reference to the drawings are exemplary only, and are used only for explanation of the present application, and cannot be understood as limiting the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0024] It should be understood that when an element or layer is referred to as being "on", "adjacent", "connected to", or "coupled to" another element or layer, it can be directly on, adjacent, connected or coupled to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly adjacent", "directly connected to", or "directly coupled to" another element or layer, then there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Therefore, the first element, component, region, layer or section discussed below can be represented as the second element, component, region, layer or section without departing from the teachings of the present application. When the second element, component, region, layer or section is discussed, it does not mean that the first element, component, region, layer or section necessarily exists.

[0025] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] It is to be understood that the terms "first", "second", and the like, used in the description and the claims of the present application as well as the above description of the drawings merely refer to structure that is different, and not necessarily to an order or precedence. It is also to be understood that the terms "comprises" and / or "comprising", or "includes" and / or "including" when used in this specification, specify the presence of stated features, steps, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, elements, components, and / or groups thereof.

[0027] In the present application, when referring to a numerical interval (i.e. a numerical range), the distribution of the selectable values within the numerical interval is considered continuous and includes both numerical end points (i.e. the minimum and maximum values) of the numerical interval and every value between the two numerical end points, unless otherwise specified. When a numerical interval refers only to integers within the numerical interval, unless otherwise specified, the two end point integers and every integer between the two end point integers, equivalent to directly listing every integer, are included. When multiple numerical ranges are provided to describe a characteristic or property, the numerical ranges can be combined. In other words, unless otherwise indicated, numerical ranges disclosed herein are to be understood to include any and all sub-ranges of the same, as well as the individual values comprising the range. A "value" in a numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. A "numerical interval" is intended to broadly include quantitative intervals, such as percentage intervals, ratio intervals, value intervals, etc.

[0028] The embodiment of the present application provides a 3D printing dental mold water-based environment-friendly cleaning liquid, a preparation method and application technical solutions. Details are shown in the following.

[0029] The exemplary embodiments according to the present application will be described more fully hereinafter with reference to the accompanying drawings. As this exemplary embodiment can be implemented in a variety of different forms, it should not be construed as being limited to the embodiments set forth herein.

[0030] The embodiment of the present application provides a 3D printing dental mold water-based environment-friendly cleaning solution, the 3D printing dental mold water-based environment-friendly cleaning solution comprises: deionized water with a mass percentage of 75-90% (for example, the mass percentage is 75%, 78%, 80%, 82%, 85%, 88%, 90%, etc.), 10-25% (for example, the mass percentage is 10%, 12%, 15%, 18%, 20%, 25%, etc.) of an organic solvent composite liquid, 1.5-6.5% (for example, the mass percentage is 1.5%, 2%, 3%, 4%, 5%, 6%, 6.5%, etc.) of a surfactant, 1.1-2.7% (for example, the mass percentage is 1.1%, 1.3%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.7%, etc.) of a pH buffer, 1-5% (for example, the mass percentage is 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc.) of zirconium oxide nanoparticles and 0.05-0.5% (for example, the mass percentage is 0.05%, 0.08%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, etc.) of a stabilizer.

[0031] It should be noted that the conventional cleaning method is to clean the dental mold by using ethanol or isopropanol, the solvent has a low flash point, has a major safety hazard, and the solvent volatilizes, does not meet the environmental protection requirements, has a high cleaning cost, and the solvent cannot be recycled.

[0032] The present application provides a two-phase cleaning system, which has a high cleaning capacity, and the single cleaning capacity can reach 75 dental molds / L, and the dental mold cannot be swollen and deformed.

[0033] The 3D printing dental mold water-based environment-friendly cleaning solution provided by the present application has a flash point greater than 100 DEG C, has no risk of flammability and explosion, and has a VOC emission less than 50 g / L, which meets the environmental protection regulations, and in addition, has a low cost and is convenient for large-scale production and application.

[0034] In the present application, the water phase and the organic phase synergistically enhance the solubility; the organic solvent in the organic phase has a strong solubility to the unreacted monomers, oligomers and other hydrophobic components on the surface of the 3D printing dental mold, can penetrate into the intermolecular gap of the resin surface, and make the residual resin swell and loosen; the surfactant in the water phase can wrap the hydrophobic dirt dissolved by the organic phase through emulsification to form a dispersible microemulsion; in the cleaning process, the water phase and the organic phase can independently dissolve impurities, and the two-phase interface reaches a dynamic balance under the regulation of the surfactant and forms a microemulsion, and the dissolved substances in the organic phase form a package in the water phase, so that the organic phase always maintains a saturated solubility.

[0035] In the present application, the surfactant can significantly reduce the water / oil interfacial tension, disperse the organic phase in the water phase in the form of nanoscale oil droplets, increase the contact area, and improve the cleaning efficiency; at the same time, the micelles formed by the hydrophobic tail can wrap the resin fragments to prevent them from re-attaching to the surface of the dental mold. The zirconium oxide powder in the system further adsorbs the hydrophobic dirt in the micelles, enhancing the "dirt carrying" ability. The weak alkaline environment (pH 8.5-9.5) provided by the pH buffer can hydrolyze the ester groups in the resin residues, allowing them to break down into water-soluble small molecules, facilitating their dissolution and removal. At the same time, the alkaline conditions can neutralize the acidic by-products (such as carboxylic acid) after the resin solidifies, reducing the risk of surface corrosion.

[0036] In the present application, the 3D printed dental mold water-based environmentally friendly cleaning solution is designed with a two-phase structure of water phase and organic phase, which has the characteristics of two-phase synergy, surfactant directional adsorption, and PH regulation and resin degradation assistance, and ultimately achieves the "1+1>2" effect.

[0037] In some embodiments, the organic solvent composite liquid includes a combination of cyclohexane, ethyl acetate, triethylene glycol dimethacrylate, hydroxyethyl methacrylate, and ethanol.

[0038] In some embodiments, the organic solvent composite liquid includes, based on 100% by mass of the organic solvent composite liquid, 30-40% (exemplary: 30%, 32%, 35%, 38%, 40%, etc.) by mass of cyclohexane, 10-25% (exemplary: 10%, 12%, 15%, 18%, 20%, 22%, 25%, etc.) by mass of ethyl acetate, 5-15% (exemplary: 5%, 8%, 10%, 12%, 15%, etc.) by mass of triethylene glycol dimethacrylate, 5-15% (exemplary: 5%, 8%, 10%, 12%, 15%, etc.) by mass of hydroxyethyl methacrylate, and 1-5% (exemplary: 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc.) by mass of ethanol.

[0039] In the present application, the organic solvent composite liquid includes cyclohexane, ethyl acetate, triethylene glycol dimethacrylate, hydroxyethyl methacrylate, and ethanol, which not only can quickly dissolve the residual hydrophobic resin on the surface of the dental mold, but also can bond with the resin molecules through free radicals, expanding the range of dirt dissolution.

[0040] In some embodiments, the surfactant includes sodium dodecylbenzenesulfonate and sodium laureth sulfate.

[0041] In some embodiments, the surfactant comprises sodium dodecyl benzene sulfonate at a mass percentage of 1-5% (for example, 1%, 2%, 3%, 4%, 5%, etc.) and sodium lauryl ether sulfate at a mass percentage of 0.5-1.5% (for example, 0.5%, 0.7%, 1%, 1.2%, 1.5%, etc.).

[0042] In the present application, the surfactant is a combination of sodium dodecyl benzene sulfonate and sodium lauryl ether sulfate, which can enhance the decontamination ability, reduce the surface tension, accelerate the dissolution of dirt, enhance the emulsification effect, and cooperate with the pH buffer to maintain the stability of the cleaning solution.

[0043] In some embodiments, the pH of the pH buffer is 8.5-9.5 (for example, 8.5, 8.8, 9, 9.2, 9.5, etc.). In some embodiments, the pH buffer comprises a combination of sodium hydroxide at a mass percentage of 0.1-0.7% (for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, etc.) and sodium bicarbonate at a mass percentage of 1-2% (for example, 1%, 1.2%, 1.5%, 1.7%, 2%, etc.).

[0044] In some embodiments, the average particle size of the zirconium oxide nanoparticles is 50-100 nm (for example, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, 100 nm, etc.). In some embodiments, the stabilizer is a combination of 2,6-di-tert-butyl-p-cresol and p-methoxyphenol, and the mass ratio of the 2,6-di-tert-butyl-p-cresol and the p-methoxyphenol is 1:(0.5-1.5) (for example, 1:0.5, 1:0.8, 1:1, 1:1.2, 1:1.5, etc.).

[0045] The present application provides a preparation method of a 3D printing dental model water-based environmentally friendly cleaning solution, which comprises the following steps: (1) under stirring, mixing 75-90% of deionized water, 1.5-6.5% of surfactant and 1.1-2.7% of pH buffer at 50-60℃ (for example, the temperature is 50℃, 52℃, 55℃, 58℃, 60℃, etc.) for 0.5-2 h (for example, the time is 0.5 h, 0.8 h, 1 h, 1.2 h, 1.5 h, 1.8 h, 2 h, etc.), then adding 1-3% of ethanol, mixing for 10-20 min (for example, the time is 10 min, 12 min, 15 min, 17 min, 20 min, etc.), to obtain the water phase; (2) under stirring, mixing the rest 10-25% of organic solvent compound and 0.05-0.5% of stabilizer at 40-50℃ (for example, the temperature is 40℃, 42℃, 45℃, 48℃, 50℃, etc.) for 10-30 min (for example, the time is 10 min, 12 min, 15 min, 17 min, 20 min, 22 min, 25 min, 27 min, 30 min, etc.), then adding 1-5% of zirconium oxide nanoparticles, ultrasonic treatment for 20-40 min (for example, the time is 20 min, 22 min, 25 min, 27 min, 30 min, 32 min, 35 min, 37 min, 40 min, etc.), to obtain the organic phase; (3) under stirring and ultrasonic, mixing the water phase obtained in step (1) and the organic phase obtained in step (2) at 40-50℃ (for example, the temperature is 40℃, 42℃, 45℃, 47℃, 50℃, etc.) for 20-100 min (for example, the time is 20 min, 30 min, 40 min, 50 min, 60 min, 70 min, 80 min, 90 min, 100 min, etc.), to obtain the 3D printing dental model water-based environmental cleaning solution.

[0046] In some embodiments, the stirring rate in step (1) is 500-2000 rpm (for example, the stirring rate is 500 rpm, 800 rpm, 1000 rpm, 1200 rpm, 1500 rpm, 1800 rpm, 2000 rpm, etc.).

[0047] In some embodiments, the stirring rate in step (2) is 500-2000 rpm (for example, the stirring rate is 500 rpm, 800 rpm, 1000 rpm, 1200 rpm, 1500 rpm, 1800 rpm, 2000 rpm, etc.).

[0048] In some embodiments, the frequency of the ultrasonic in step (2) is 30-50 KHz (for example, the frequency is 30 KHz, 32 KHz, 35 KHz, 38 KHz, 40 KHz, 42 KHz, 45 KHz, 48 KHz, 50 KHz, etc.). In some embodiments, the stirring rate in step (3) is 500-2000 rpm (for example, the stirring rate is 500 rpm, 800 rpm, 1000 rpm, 1200 rpm, 1500 rpm, 1800 rpm, 2000 rpm, etc.). In some embodiments, the frequency of the ultrasonic in step (3) is 30-50 KHz (for example, the frequency is 30 KHz, 32 KHz, 35 KHz, 38 KHz, 40 KHz, 42 KHz, 45 KHz, 48 KHz, 50 KHz, etc.).

[0049] The embodiments of the present application provide a 3D printing dental mold water-based environment-friendly cleaning solution for cyclic cleaning of a dental mold.

[0050] In some embodiments, as shown in Figure 1 The device for cyclic cleaning comprises, in sequence, a reaction unit, a light curing unit, a filtering unit, and an intelligent control unit. The reaction unit comprises a reaction tank and a stirring system. The light curing unit comprises a double light source UV-LED array. The filtering unit is a three-stage gradient filtering unit, comprising a first filtering unit with a filtering particle size of 40-60 mesh (for example, the particle size is 40 mesh, 45 mesh, 50 mesh, 55 mesh, 60 mesh, etc.), a second filtering unit with a filtering particle size of 100-200 mesh (for example, the particle size is 100 mesh, 110 mesh, 120 mesh, 130 mesh, 140 mesh, 150 mesh, 160 mesh, 170 mesh, 180 mesh, 190 mesh, 200 mesh, etc.), and a third filtering unit with a filtering particle size of 250-350 mesh (for example, the particle size is 250 mesh, 260 mesh, 270 mesh, 280 mesh, 290 mesh, 300 mesh, 310 mesh, 320 mesh, 330 mesh, 340 mesh, 350 mesh, etc.).

[0051] In some embodiments, the reaction unit is a core container for waste liquid treatment, used to provide a space for waste liquid storage, reaction, and solid-liquid separation; the light curing unit is used to induce cross-linking and curing of the unreacted resin monomers in the cleaning solution through ultraviolet light induction, so as to convert the unreacted resin monomers into filterable solids; the filtering unit is used to filter the mixture after light curing in stages, so as to obtain clear and renewable cleaning solution; the cleaning solution is mixed with newly supplemented cleaning solution, and the cyclic cleaning of the 3D dental mold is performed.

[0052] The reaction unit comprises a reaction tank and a stirring system. The reaction tank is a space for providing waste liquid storage, reaction and solid-liquid separation. The material of the reaction tank is preferably a high-transmittance material, which facilitates observation of the internal reaction state.

[0053] The stirring system can accelerate the reaction and mixing process together with the photocuring unit, accelerate the crosslinking of the resin, prevent the sedimentation of solid particles, ensure sufficient reaction, and improve efficiency. In the specific implementation process, the type of stirring paddle and the stirring rate are not limited, and those skilled in the art can adjust them according to actual needs. Preferably, ultrasonic-assisted mechanical stirring is used. The mechanical stirring uses a frequency conversion motor to drive a paddle or turbine stirrer, with a rotation speed range of 50-2000 rpm. The ultrasonic wave uses a 30-50 KHz ultrasonic transducer to strengthen the dispersion of zirconium oxide powder and the dissociation of resin in the waste liquid.

[0054] The photocuring unit uses a 365 nm / 405 nm dual-wavelength UV-LED array, which can take into account the curing of resins with 365 nm or 405 nm different initiation systems commonly used in 3D dental model printing, achieving the effect of fully removing unreacted monomers. In the specific implementation process, the power and time of photocuring are not limited, and those skilled in the art can adjust them according to actual needs. Preferably, the power is 50-500 W, and the irradiation time is 30-120 s.

[0055] The filtration unit uses a three-stage filtration system. The first-stage filtration is used to remove large particles with an average particle size of 250-350 microns. The second-stage filtration is used to remove residual particles with an average particle size of 100-250 microns. The third-stage filtration is used to remove impurities such as colloidal particles with a particle size of less than 100 microns, thereby ensuring the filtration effect and obtaining clear filtrate.

[0056] In some embodiments, a monitoring unit is further included. In the first aspect, the process parameters of the reaction unit and the photocuring unit can be controlled, which exemplarily include controlling the temperature of the reaction unit, real-time feedback of the light intensity of the photocuring unit, and automatic compensation for the attenuation. In the second aspect, the turbidity of the liquid after filtration can be detected, and when the turbidity is lower than the requirement, the liquid can be returned to the reaction unit. In the third aspect, new cleaning liquid can be supplemented according to the temperature and turbidity data of the liquid returned to the reaction unit, thereby maintaining the effective components of the cleaning liquid.

[0057] In some embodiments, the method for cyclic cleaning comprises: (1) After 70-80 dental models (for example, the number of dental models is 70, 72, 75, 77, 80, etc.) are cleaned with the cleaning solution, the waste liquid after cleaning is controlled at a temperature of 25-50°C (for example, the temperature is 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, etc.), and is stirred at a stirring rate of 400-600 rpm (for example, the stirring rate is 400 rpm, 420 rpm, 450 rpm, 480 rpm, 500 rpm, 520 rpm, 550 rpm, 580 rpm, 600 rpm, etc.) for 5-15 min (for example, the time is 5 min, 8 min, 10 min, 12 min, 15 min, etc.), and then is subjected to ultraviolet irradiation at a temperature of 30-40°C (for example, the temperature is 30°C, 32°C, 35°C, 37°C, 40°C, etc.) for 20-90 s (for example, the time is 20 s, 30 s, 40 s, 50 s, 60 s, 70 s, 80 s, 90 s, etc.), so that the dissolved resin is cross-linked and cured to obtain a mixed liquid; (2) The mixed liquid obtained in step (1) is gradiently filtered to obtain a filtrate, and the filtrate is supplemented with cleaning solution for further cleaning.

[0058] In this application, after 70-80 dental models are cleaned with the cleaning solution in a single cleaning process, the organic phase dissolving capacity is close to saturation, and the viscosity of the cleaning solution increases. First, the cleaning solution is placed in a reaction tank, stirred at 25-50°C for 5-15 min, and the zirconium oxide particles and large particle impurities are preliminarily suspended. Second, under the action of ultraviolet light, the residual uninitiated monomers in the solution are initiated to polymerize and cross-link to form resin particles or suspensions, and the temperature is controlled at 30-40°C to accelerate the kinetics of photochemical reaction. Then, by gradient filtration, resin polymers and metal debris, polymer gels and small molecular impurities are intercepted in sequence, so that the filtrate can be reused for cleaning after being supplemented with fresh cleaning solution. In some embodiments, when gradient filtration is performed, three-stage gradient filtration is performed, including first filtering large particle size resin blocks and metal debris using a first filter unit with a particle size of 40-60 mesh, recycling the backwash water, then removing polymer gels using a second filter unit with a particle size of 100-200 mesh, and then filtering the filtrate into a temporary storage tank using a third filter unit with a particle size of 250-350 mesh to ensure that the turbidity is less than 5, and the filtrate is supplemented with fresh cleaning solution for re-cleaning.

[0059] In some embodiments, the filter cake filtered by the filter unit can recover zirconium oxide therein by a magnetic frame, and the recovered zirconium oxide can be reused after ultrasonic cleaning.

[0060] In some embodiments, according to the results of real-time monitoring, the surfactant, pH regulator, etc. are supplemented into the filtrate adaptively.

[0061] The 3D printed dental mold water-based environmentally friendly cleaning fluid or manufacturing method or recycling provided by the embodiments of the application and the related comparative examples will be tested for performance.

[0062] Embodiments 1-4 and Comparative Examples 1-3 provide a formula and process parameters for a 3D printed dental mold water-based environmentally friendly cleaning fluid, as shown in Table 1:

[0063] Table 1 The cleaning fluids configured in embodiments 1-4 and comparative examples 1-3 are tested for performance as follows: (1) Cleaning accuracy: clean 75 dental molds, and judge the cleaning accuracy and whether there is deformation according to the tightness of the trial dental mold; (2) Cleaning effect: whether the touch is sticky, and whether the dentures are smoothly brought in; (3) Cleaning quantity: standard operation, counting method.

[0064] The test results are shown in Table 2:

[0065] Table 2 As can be seen from Table 2, the cleaning fluid obtained by the technical solution of the application has good cleaning effect and cleaning quantity, and the cleaning quantity can reach 70-75 L per piece, which is better than the technical effect of the comparative examples.

[0066] After cleaning 75 dental molds with 1 L of cleaning fluid in embodiment 1, the viscosity of the cleaning fluid is tested and found to increase by 15%. The following treatment is performed: (1) Pour the cleaning fluid into a high-transparency reaction tank with a custom volume of 10 L, start stirring at a speed of 500 rpm for 10 min, and then irradiate with a UV-LED array (405 nm / 365 nm, power 300 W) at a temperature of 35°C for 30 s to make the dissolved resin crosslink and solidify, obtaining a mixed liquid; (2) The mixed liquid is subjected to three-stage gradient filtration, including first-stage filtration with a 50-mesh stainless steel filter screen, second-stage filtration with a 150-mesh filter screen, and third-stage filtration with a 300-mesh filter screen, and the turbidity of the obtained filtrate is less than 5; (3) Supplement 15% of fresh cleaning fluid to the filtrate, and circulate it for not less than 5 times.

[0067] Among them, the key parameter control is shown in Table 3:

[0068] Table 3 After 75 dental models were cleaned by the cleaning solution of Example 1, 10 times of recycling were performed, and the recycling performance is shown in Table 4:

[0069] Table 4 As can be seen from Table 4, after the tenth cycle: the cleaning efficiency retention rate is 93.3%; the size change rate is 0.06±0.02%; the surface roughness is Ra<0.8 μm; and the performance requirements of the cleaning solution for 3D printing dental models can still be met.

[0070] The economic indicators are: single cleaning cost: 0.42 yuan per piece (traditional alcohol: 0.68 yuan per piece); and the waste liquid treatment cost is reduced by 65%.

[0071] It should be noted that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. The orientation terms "inner" and "outer" refer to the inner and outer of the profile of each component itself. For example, if the devices in the drawings are inverted, the devices described as "above" or "on" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The devices can also be positioned in other different ways (rotated by 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0072] It should also be noted that "one embodiment", "another embodiment", "embodiment", and the like in the present application refer to specific features, structures or characteristics described in conjunction with the embodiment, which are included in at least one embodiment described generally in the present application. The same description appearing in several places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the implementation of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present application.

[0073] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0074] It also needs to be explained that the above is only the preferred embodiment of the application, and does not limit the patent protection scope of the application, and any equivalent structure or equivalent process transformation using the content of the application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the application.

Claims

1. A water-based environmentally friendly cleaning solution for 3D printed dental molds, characterized in that, The 3D printed dental mold water-based environmentally friendly cleaning solution includes: 75-90% deionized water, 10-25% organic solvent composite solution, 1.5-6.5% surfactant, 1.1-2.7% pH buffer, 1-5% zirconium oxide nanoparticles, and 0.05-0.5% stabilizer.

2. The water-based environmentally friendly cleaning solution for 3D printed dental molds according to claim 1, characterized in that, The organic solvent complex comprises a combination of cyclohexane, ethyl acetate, triethylene glycol dimethacrylate, hydroxyethyl methacrylate, and ethanol; Based on a mass percentage of 100%, the organic solvent composite liquid comprises 30-40% cyclohexane, 10-25% ethyl acetate, 5-15% triethylene glycol dimethacrylate, 5-15% hydroxyethyl methacrylate, and 1-5% ethanol.

3. The water-based environmentally friendly cleaning solution for 3D printed dental molds according to claim 1, characterized in that, The surfactants include sodium dodecylbenzenesulfonate and sodium lauryl ether sulfate; The surfactant comprises sodium dodecylbenzenesulfonate at a mass percentage of 1-5% and sodium lauryl ether sulfate at a mass percentage of 0.5-1.5%.

4. The water-based environmentally friendly cleaning solution for 3D printed dental molds according to claim 1, characterized in that, The pH of the pH buffer is 8.5-9.5; The pH buffer comprises a combination of sodium hydroxide at a mass percentage of 0.1-0.7% and sodium bicarbonate at a mass percentage of 1-2%.

5. The water-based environmentally friendly cleaning solution for 3D printed dental molds according to claim 1, characterized in that, The average particle size of the zirconium oxide nanoparticles is 50-100 nm. The stabilizer is a combination of 2,6-di-tert-butyl-p-cresol and p-methoxyphenol, wherein the mass ratio of 2,6-di-tert-butyl-p-cresol to p-methoxyphenol is 1:(0.5-1.5).

6. The method for preparing the water-based environmentally friendly cleaning solution for 3D printed dental molds according to any one of claims 1-5, characterized in that, The preparation method includes the following steps: (1) Under stirring conditions, 75-90% deionized water, 1.5-6.5% surfactant and 1.1-2.7% pH buffer are mixed at 50-60℃ for 0.5-2 h, and then 1-3% ethanol is added and mixed for 10-20 min to obtain an aqueous phase. (2) Under stirring conditions, the remaining organic solvent composite liquid and 0.05-0.5% of stabilizer are mixed at 40-50℃ for 10-30 min, and then 1-5% by mass of zirconium oxide nanoparticles are added and ultrasonically treated for 20-40 min to obtain the organic phase; (3) Under stirring and ultrasonic conditions, the aqueous phase obtained in step (1) and the organic phase obtained in step (2) are mixed at 40-50℃ for 20-100 min to obtain a water-based environmentally friendly cleaning solution for 3D printed dental molds.

7. The preparation method according to claim 6, characterized in that, The stirring rate in step (1) is 500-2000 rpm; The stirring rate in step (2) is 500-2000 rpm; The frequency of the ultrasound in step (2) is 30-50 kHz; The stirring speed in step (3) is 500-2000 rpm; The frequency of the ultrasound in step (3) is 30-50 kHz.

8. The water-based environmentally friendly cleaning solution for 3D printed dental molds according to any one of claims 1-5 is used for circulating cleaning of dental molds.

9. The application according to claim 8, characterized in that, The circulating cleaning device includes a reaction unit, a photocuring unit, a filtration unit, and an intelligent control unit connected in sequence. The reaction unit includes a reaction vessel and a stirring system; The photocuring unit includes a dual-source UV-LED array; The filtration unit is a three-stage gradient filtration unit, including a first filtration unit with a particle size of 40-60 mesh, a second filtration unit with a particle size of 100-200 mesh, and a third filtration unit with a particle size of 250-350 mesh.

10. The application according to claim 9, characterized in that, The cyclic cleaning method includes: (1) After cleaning 70-80 dental molds with cleaning solution, control the temperature of the waste liquid after cleaning at 25-50℃ and stir for 5-15 min at a stirring speed of 400-600 rpm. Then, irradiate with ultraviolet light at a temperature of 30-40℃ for 20-90 s to crosslink and solidify the resin impurities generated during cleaning of the dental molds, and obtain a mixture. (2) The mixture obtained in step (1) is filtered by gradient to obtain filtrate, and the filtrate is supplemented with cleaning solution to continue cleaning.

Images