858 results about "Microcrystalline" patented technology

The invention provides an arc-shaped microcrystalline glass plate structure performance detection system, and belongs to the technical field of material performance testing. The system comprises a rack, a sample table, an impact mechanism, a swing rod, a swing part, a driving assembly and a medium taking and supplying assembly, the sample table is provided with an arc-shaped supporting surface and a medium cavity; the impact mechanism is positioned above the arc-shaped supporting surface; the swing rod is provided with a sliding channel. The bottom end of the swinging piece is used for driving the sample table to rotate; the driving assembly comprises a rotating output shaft, a transmission arm and a transmission sliding block which are connected in sequence, the rotating output shaft is connected to the rack and is parallel to the rotating shaft of the swing rod, and the transmission sliding block is contained in the sliding channel in a sliding mode; the medium taking and supplying assembly comprises a piston barrel and a piston rod, the piston barrel is fixedly connected with the swing rod and provided with a one-way inflow port and a one-way outflow port communicated with the medium cavity, a piston of the piston rod is slidably sealed with the piston barrel, and a rod body is in transmission connection with the transmission sliding block. The system can realize multi-position and variable-temperature detection, and the detection reliability is higher.

The application provides a chemically strengthened microcrystalline glass, a cover plate glass, an electronic device and a glass device, and belongs to the technical field of microcrystalline glass. The application makes the surface composition and stress structure of the chemically strengthened microcrystalline glass with lithium disilicate as the main crystal phase meet specific requirements, so that the chemically strengthened microcrystalline glass can meet high stress levels and also ensure good weather resistance, and can better ensure that the chemically strengthened microcrystalline glass meets application requirements.

The invention discloses a surface defect detection system based on a microcrystalline glass panel finished product, and relates to the technical field of surface defect detection. The defect full-dimensional dynamic state map construction module is used for constructing and updating a defect full-dimensional dynamic state map containing defect three-dimensional coordinate information, multi-modal feature confidence information, virtual-entity parameter deviation information and feature definition-registration precision linkage threshold information in real time; the structured light three-dimensional contour acquisition module is used for acquiring three-dimensional contour data of the surface of the microcrystalline glass panel; the multi-modal feature fusion module is used for collecting two-dimensional image data of multi-light-source imaging and extracting multi-modal feature information; the digital twin virtual debugging module is used for constructing a virtual detection environment based on the defect full-dimension dynamic state graph; the problem of feature confusion caused by light source combinational logic solidification in an existing multi-light-source switching system is effectively solved.

The invention belongs to the technical field of electronic ceramic substrate materials, and particularly relates to a preparation method of a microcrystalline glass composite silicon nitride ceramic substrate, which is prepared from the following raw materials: 1-5% of alpha-phase silicon nitride powder, 86-95% of beta-phase silicon nitride powder, 0.2-3% of metal silicon powder, 2.5-8% of glass powder and 1.3-8% of metal oxide. The preparation method comprises the following steps: S1, mixing and grinding raw materials to obtain ceramic slurry; s2, adding Arabic gum into the ceramic slurry as a binder, and carrying out spray granulation; granulation powder is obtained; s3, carrying out dry pressing molding and cold isostatic pressing treatment on the granulation powder to prepare a ceramic plate blank; and S4, sintering and crystallizing the ceramic plate blank. According to the invention, the glass ceramic powder is introduced as a sintering aid and a second phase, and the sintering temperature of the silicon nitride is obviously reduced from the conventional temperature of more than 1800 DEG C to 1500 DEG C by utilizing the liquid phase effect of the glass ceramic powder in the sintering process, so that two modes of air pressure sintering and normal pressure sintering can be used, and the energy consumption and the requirements on equipment are reduced.

The invention provides a coated microcrystal lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The positive electrode material is a lithium-rich manganese-based positive electrode material which is prepared from a lithium-rich manganese-based precursor and has primary particles formed in situ and secondary spheres with surface coatings. The positive electrode material has a unique core-shell structure, the core is a microcrystal lithium-rich material, the shell is a nanoscale solid electrolyte layer, and the shell layer coats primary particles and secondary spheres at the same time; the structure effectively inhibits the interface side reaction between the positive electrode material and the solid electrolyte, and stabilizes the interface structure; a continuous and short Li and charge transmission path is provided, the interface impedance in an all-solid-state battery is remarkably reduced, and the rate capability and the cycling stability of the material are improved.

The application provides a chemically strengthened microcrystalline glass, a cover plate glass, an electronic device and a glass device, and belongs to the technical field of microcrystalline glass; through the high lithium content microcrystalline glass with a specific composition and taking lithium disilicate as a main crystal phase, after chemical strengthening treatment, specific stress characteristics are met, especially the relationship between the molar percentage content of ZrO2 in the microcrystalline glass and the stress characteristic relationship A meets specific requirements, that is, the range requirement of the relationship B is met, not only can the problem of "surface cracking" of the prepared chemically strengthened microcrystalline glass be effectively overcome, but also the chemically strengthened microcrystalline glass can be ensured to have high mechanical strength performance, and further the chemically strengthened microcrystalline glass can be ensured to have excellent damage resistance.

The invention provides a high-temperature solid heat storage material based on industrial solid waste, a preparation method of the high-temperature solid heat storage material and a heat storage pile, and belongs to the technical field of energy and new energy storage and energy saving materials. The high-temperature solid heat storage material is prepared by introducing three functional additives with a synergistic effect: a composite alkali-boron activator is used for bonding and forming solid waste raw materials through a geological polymerization reaction at a low temperature, and is converted into a fluxing agent at a high temperature to promote low-temperature densification of the material; a core-shell structure thermal conductivity reinforcing agent with an anti-oxidation glass shell layer constructs an efficient three-dimensional heat conduction network in the material, and the heat conduction rate is increased; meanwhile, the Li-Al-Si vitrified precursor powder is induced to separate out low-thermal-expansion microcrystals in a third temperature stage, and the material is endowed with thermal shock resistance stability through a microstress compensation mechanism; the three additives have a synergistic effect to improve the heat storage performance and mechanical stability of the material.

The invention relates to a method for preparing a hard carbon material from a low-rank coal hot melt, the hard carbon material obtained by using the method, application of the hard carbon material and a sodium ion battery containing the hard carbon material. The method comprises the steps of raw material pretreatment, degradation solvent extraction, precipitation separation, spray granulation, crosslinking, primary carbonization, secondary carbonization, cooling and the like. According to the method, microcrystalline defects of the coal-based hard carbon material are regulated and controlled through self-foaming of the low-rank coal hot melt, effective regulation and control of the hard carbon microcrystalline structure are achieved, the ultrafine grinding process is omitted, meanwhile, in-situ oxygen element doping is achieved, and the surface activity of the material and the first efficiency of the negative electrode material are effectively improved. Through the method, the low-rank coal can be converted into the sodium battery hard carbon negative electrode material in a high-valued manner, the application scene of the low-rank coal is expanded, and the comprehensive utilization level of coal resources is improved.

The present application relates to a kind of composite phosphorus-free scale inhibitor and its preparation method, including 800-1200 parts by weight of desalted water, 1-3 parts by weight of modified lignin sulfonate, 2-4 parts by weight of calcium magnesium acetate, 0.5-1.5 parts by weight of azole, 400-600 parts by weight of soluble inorganic zinc salt and 50-150 parts by weight of copolymer A.The composite phosphorus-free scale inhibitor provided by the present application is clear and transparent concentrate, after the above concentrate is added to circulating water, the effective ingredient in it can form soluble chelate with Ca 2+ , Mg 2+ Forming, increase the saturation solubility of ion, hinder micro-fouling lattice formation, distort crystal growth, so that microcrystalline will not accumulate into scale, and can make old scale loose, gradually shed old scale;At the same time, the special corrosion inhibitor and other corrosion inhibitor produce synergistic effect, which can effectively control the pitting of stainless steel, achieve the purpose of preventing scale, and fundamentally reduce the efficiency of corrosion and scale inhibition.

The invention provides an efficient boiler scale and corrosion inhibition composite agent and a preparation method thereof, and belongs to the technical field of water treatment agents. The sulfonated polycarboxylic acid copolymer is introduced, crystal nucleus formation is inhibited through chelation of carboxylic acid groups of the sulfonated polycarboxylic acid copolymer, the dispersing capacity and hard water tolerance are improved through sulfonic acid groups, normal growth of microcrystals can be adsorbed and interfered through regulation and control of isopropanol on molecular weight, and loose scale bodies easy to remove are promoted to be formed; the polyether grafted copolymer is used as an efficient dispersing agent, the main chain of the polyether grafted copolymer is responsible for adsorbing and anchoring generated tiny scale bodies, and extended polyether long side chains of the polyether grafted copolymer form a steric hindrance shielding layer to wrap particles and suspend stably, so that the scale bodies are prevented from gathering and growing up; the two components cooperate to form a scale inhibition defense line, and cooperate with auxiliary agents such as the compound amine and the deoxidant in the system to construct a comprehensive protection network, so that long-period stable operation of the boiler system is guaranteed.

The invention discloses an LTCC (Low Temperature Co-Fired Ceramic) material with a controllable shrinkage rate and a preparation method thereof. The material comprises microcrystalline glass A and a glass devitrification material B, wherein the glass devitrification material B is obtained by devitrifying microcrystalline glass C according to a specific temperature system. The glass ceramic A and the glass ceramic C have different softening temperatures. And accurately regulating and controlling the crystallization state of the glass crystallization material B by regulating and controlling the crystallization treatment temperature and / or crystallization treatment time of the microcrystalline glass C. The LTCC substrate prepared from the LTCC material can be co-fired with a silver conductor while ensuring sintering compactness and excellent high-frequency performance, and the sintering shrinkage rate is controllable in the range of 14%-18% on the X / Y axis.

The invention provides an LTCC raw material belt with a high thermal expansion coefficient, an LTCC substrate and a preparation method of the LTCC substrate, the LTCC raw material belt with a smooth surface and a uniform thickness is obtained through tape casting by adjusting the proportion of silicon dioxide ceramic powder, MgTiO3 ceramic, SrTiO3 ceramic, Li2MgSiO4 ceramic, BCBS, ZABS and LASP microcrystalline glass powder, the LTCC raw material belt is sintered in a nitrogen furnace at 880-940 DEG C for 1-3 h, and the LTCC raw material belt can be co-fired with low-cost copper electrode slurry to be flat and tightly attached to the low-cost copper electrode slurry. The LTCC substrate with the thermal expansion coefficient larger than 11 ppm / DEG C is prepared, under the test frequency of 5 GHz, the dielectric constant of the LTCC substrate ranges from 5.1 to 6.1, the dielectric loss ranges from 0.0025 to 0.004, the bending strength ranges from 170 MPa to 230 MPa, the thermal expansion coefficient at the temperature ranging from 30 DEG C to 400 DEG C ranges from 11.0 ppm / DEG C to 13.0 ppm / DEG C, and acid resistance is good.

The invention discloses a preparation method of a high-performance bagasse hard carbon negative electrode material. According to the invention, bagasse is taken as a raw material, constant-temperature pickling treatment is carried out, carbonization conditions are accurately controlled, an oil bath auxiliary activator is adopted to activate the carbon material, carbon layer spacing is specifically enlarged, closed pores are constructed, and the structure and electrochemical performance of the hard carbon material are significantly improved. The solid activating agent is decomposed under the oil bath condition to generate a gas-phase oxidizing agent, hard carbon is mildly and uniformly etched and modified from the interior of particles, pores are created, meanwhile, a graphite microcrystalline structure beneficial to sodium storage is better reserved and optimized, and the first effect, the reversible specific capacity, the cycling stability and the platform capacity ratio of the hard carbon negative electrode material are improved.

The invention belongs to the technical field of digital printing heat transfer printing materials, and particularly relates to a static-free loose-powder DTF transfer printing film and a preparation method thereof. The invention aims to solve the problem of contradiction among antistatic function, ink adsorption and peel strength of the current DTF transfer film. According to the invention, the ionic liquid antistatic agent coated by the polymer microcapsule is dispersed in the water-based resin adhesive to form the lower antistatic network structure layer; meanwhile, the crystallization behavior of the crystalline polyester hot melt adhesive resin taking bio-based 2, 5-furandicarboxylic acid as a rigid component is regulated and controlled through surface modified boron nitride nanosheets, a phase separation curing process is utilized, so that an antistatic network stably exists at the lower part of the coating, and hot melt adhesive resin microcrystals are selectively enriched on the outermost surface of the coating; and a thermally induced phase change bonding layer is formed, so that no static electricity disturbs powder in the printing and powder scattering processes.

The invention discloses microcrystalline glass with excellent mechanical properties and weather resistance. Main crystalline phases of the microcrystalline glass are petalite and silicon lithium stone; the overall crystallinity of the microcrystalline glass is 85% or above; the mass fraction of Na2O on the surface of the microcrystalline is 1%-5%, the mass fraction of K2O is 1%-3%, the mass fraction ratio of Na2O to K2O is 1-3, and the microcrystalline glass is prepared through melting, heat treatment, slicing and two times of chemical strengthening. By designing a two-strong process with proper surface K2O and Na2O concentrations, the weatherability performance better than that in the prior art is obtained, and meanwhile, the performance of 4PB / ROR / falling ball / abrasive paper is improved to a certain extent.

The invention discloses oil shale waste / fly ash glass ceramics as well as a preparation method and application thereof, relates to the technical field of glass ceramics, and solves the problems that in the prior art, OSA post-treatment is serious in environmental harm and low in resource utilization rate, and when OSA is applied to glass ceramics preparation, the crystal phase structure is unstable, the process controllability is poor, and the production cost is high. And high quality, low cost and sustainable utilization of the microcrystalline glass are difficult to realize at the same time. The oil shale waste / fly ash glass ceramic is prepared from 80 parts of industrial waste residues, 4-6 parts of nucleating agent and 14-16 parts of auxiliary components, the industrial waste residue is composed of 50-75 parts of oil shale residue and 5-30 parts of fly ash; the preparation method comprises the following steps: mixing the oil shale waste with the fly ash, adding the nucleating agent and the auxiliary components, grinding, melting, preserving heat, pouring the melt into a mold, and annealing to obtain base glass; and carrying out polishing treatment and heat treatment on the base glass to obtain the microcrystalline glass. The invention can be applied to the fields of building decoration and electrical insulating materials.

1. The name of the design product: microcrystalline pen base. 2. The use of the design product: for placing articles such as microcrystalline pens or charging. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The utility model relates to the technical field of glass ceramic production, in particular to a glass ceramic raw material melting furnace which comprises an outer shell, a baffle ring is arranged at the bottom of the inner side of the outer shell, a flame nozzle is arranged in the baffle ring, a melting furnace is arranged in the outer shell, and a feeding channel is arranged at the top of the melting furnace. A mixing assembly is arranged on the melting furnace, a quick release assembly is arranged on the outer shell, a moving assembly is arranged at the bottom of the outer shell, a first motor drives a gear on a first rotating shaft to rotate, the gear drives the melting furnace to rotate through an annular rack, and meanwhile a second motor drives a plurality of stirring blades on a stirring shaft to rotate. Various raw materials in the melting furnace can be fully mixed through rotation of the stirring blades and the melting furnace, layered melting of different raw materials is avoided, the bottom of the melting furnace can be heated more uniformly through rotation of the melting furnace, various raw materials in the melting furnace are molten more fully, it is avoided that molten glass possibly contains part of particles, and the quality of a microcrystalline glass panel is improved.

The application discloses transparent microcrystalline glass and a preparation method thereof, relates to the technical field of microcrystalline glass preparation, and discloses a preparation method of transparent microcrystalline glass, which comprises the following steps: S1, placing a common glass sheet on a lifting loading platform in a high-temperature furnace, then driving a screw rod to rotate through a rotating motor, thereby driving a first nut block to move in an upward direction, and the first nut block drives a bottom base, the lifting loading platform and the glass sheet to move upward; when the outer surface of a heating rod in the high-temperature furnace is attached with a large amount of oxide layers, the cleaning mechanism can be used to open a vertical hydraulic rod to make a top frame descend into a microcrystalline chamber in the high-temperature furnace, at this time, a first motor is opened to drive a T-shaped sliding rail outside an upper arc-shaped brush to slide in an arc-shaped track, then the upper arc-shaped brush and a lower arc-shaped brush surround the heating rod, and the upper arc-shaped brush and the lower arc-shaped brush move up and down to clean the oxide layers on the heating rod in the microcrystalline chamber.

The invention relates to the technical field of glass ceramics, in particular to a silicon dioxide-containing glass ceramic wafer substrate and a preparation method thereof. The preparation method comprises the following steps: weighing aluminum oxide, hydroxyethyl urea, chromium dioxide, lithium oxide, magnesium oxide, titanium dioxide, a clarifying agent, a toughening agent and silicon dioxide; preparing an aqueous solution from hydroxyethyl urea, and putting the powder, a clarifying agent, a toughening agent and the aqueous solution into a ball milling tank to obtain slurry; carrying out vacuum defoaming, tape casting, drying, glue removal heat treatment, glass melting, rolling and annealing treatment to obtain a glass plate; and polishing, ultrasonically cleaning and drying the glass plate to obtain the wafer substrate. According to the preparation method, hydroxyethyl urea and chromium dioxide are combined under a specific controlled heat treatment system, so that the functions of a conventional dispersing agent are exceeded, a unique toughening phase existing in a grain boundary is generated through in-situ reaction, uniform formation of a superfine nanocrystalline structure is realized synergistically, and thus the fracture toughness and the surface flatness of the material are synchronously and remarkably improved.

The application discloses a kind of bismuth ferrite-barium titanate textured piezoelectric ceramics and preparation method thereof, belong to ceramic preparation technical field, the preparation method includes: with (001) crystal direction BaTiO3 flaky microcrystal as template, with (1-x) BiFeO3-xBaTiO3 ceramic matrix powder is mixed, through casting process, matrix powder is grown along the template crystal direction, during, by controlling the amount of BaTiO3 flaky microcrystal, so that the volume ratio of it and ceramic matrix powder does not exceed 0.06, the thickness of casting film is 30~50 μm, and high-temperature sintering and high-temperature quenching mode with temperature up to 970 ℃~1040 ℃ is used, finally form textured BF-BT ceramic, the formed ceramic has good piezoelectric property and texture degree, and the above method process is simple, without adding additional material.

The invention provides a manufacturing method of a doped microcrystalline silicon layer, a heterojunction solar cell and a preparation method of the heterojunction solar cell. The manufacturing method of the doped microcrystalline silicon layer comprises the steps that firstly, PECVD equipment is provided, the PECVD equipment comprises a reaction cavity, an upper polar plate and a lower polar plate, the upper polar plate and the lower polar plate are located in the reaction cavity and are oppositely arranged in parallel, and the upper polar plate is connected with a radio frequency power source; placing a silicon wafer on the lower polar plate and between the upper polar plate and the lower polar plate; the substrate distance between the upper pole plate and the lower pole plate is set as a first distance, a microcrystalline silicon seed layer is deposited through a doping deposition process, and the first distance ranges from 26 mm to 50 mm; and finally, the distance between the substrates is adjusted to be a second distance, the doping deposition process is carried out, a microcrystalline silicon main layer is deposited on the microcrystalline silicon seed layer, and the range of the second distance is 10-24 mm. According to the invention, the quality of the doped microcrystalline silicon layer can be improved, the stability of the heterojunction solar cell is improved, and the dark attenuation of the heterojunction solar cell is reduced.

The application provides a base glass, a preparation method of the base glass, a glass powder, a granulation powder, a glass insulator and a temperature sensor glass sealing workpiece. 3 The base glass comprises BaO 50-80 parts, B2O3 5-30 parts, SrO 1-10 parts, SiO2 1-25 parts, Al2O3 1-15 parts, CaF2 0.1-10 parts, TiO2 0.1-5 parts, rare earth oxide 0.7-3.1 parts and Nb2O5 0.1-3 parts; the rare earth oxide comprises La2O3 and Y2O3. The glass raw material of the application is lead-free, has high strength and air tightness, the lead-free microcrystalline glass system meets the insulation requirement of high-temperature sensors under long-time high-temperature environment, is resistant to repeated temperature impact and will not crack, the electric property does not attenuate, the problem of high-temperature resistance of metal sealing parts is solved, and the performance requirements of high-temperature resistance and high insulation are met.

This invention discloses a method for preparing a metal-doped anode material with high closed-pore ratio, comprising the following steps: pre-oxidation, liquid-phase coating, isostatic pressing, metal doping, and carbonization. By using glucose to liquid-phase coat pre-oxidized biomass char, followed by isostatic pressing to form a dense and uniform composite carbon framework, the pores are predominantly closed pores of 0.4-2 nm, and the carbon layer is tightly bonded to the matrix without cracks. Furthermore, by gas-phase doping with zinc, zinc is uniformly dispersed in the form of single atoms / clusters and embedded in the carbon lattice, forming a unique Zn-C coordination structure without metal particle agglomeration defects. Simultaneously, the high temperature of 1400-1600℃ promotes the migration of zinc atoms into the carbon lattice depth, improving the microcrystallinity of the carbon material while retaining sodium storage active sites, resulting in stronger structural stability and ultimately achieving a high closed-pore ratio, thereby improving the capacity and rate performance of the anode material.

The invention provides a silicon heterojunction cell, a preparation method and a photovoltaic module, and the method comprises the following steps: heating a pretreated substrate under a vacuum condition, and obtaining a heated substrate; sequentially growing an intrinsic amorphous silicon passivation layer, n-type doped hydrogenated microcrystalline silica, a transparent oxide conductive film and a metal electrode on the front surface of the heated substrate by adopting a chemical deposition method; sequentially growing an intrinsic amorphous silicon passivation layer, three p-type selective contact layers, a transparent oxide conductive film and a metal electrode on the back surface of the heated substrate by adopting a chemical deposition method; the three p-type selective contact layers comprise a p-type hydrogenated microcrystalline silicon layer, a CO2 lightly doped p-type hydrogenated microcrystalline silicon oxygen layer and a CO2 heavily doped p-type hydrogenated microcrystalline silicon oxygen layer; the three p-type selective contact layers constructed by the invention can provide excellent conductivity, transmittance and contact performance, and the filling factor of the cell is improved, so that the photoelectric conversion efficiency of the cell is improved.

The application relates to a composite type corrosion and scale inhibition water treatment agent, which is obtained by in-situ copolymerization of phosphono carboxylic acid copolymer after modification of nitrogen-doped carbon quantum dots on the surface of attapulgite as a carrier. The application has the beneficial effects that: the attapulgite is used as the carrier, can be used as a grafting bridge to load the carbon quantum dots on the surface and in-situ generate the phosphono carboxylic acid copolymer, and has a synergistic effect; the nitrogen-doped carbon quantum dots have rich amino, carboxyl and hydroxyl functional groups on the surface, make it difficult for calcium carbonate microcrystals to gather or interfere with the normal growth of the crystals to inhibit scale crystal generation, have high stability, are coated with zinc ions, improve the antibacterial property of the material, are modified on the surface of the attapulgite, have excellent adsorption performance, and can effectively remove organic matters, heavy metals and the like in water; the phosphono carboxylic acid copolymer is in-situ generated on the surface of the attapulgite, has a good compounding effect, has a good effect on corrosion inhibition, and has good corrosion inhibition performance.

A 3D microcrystalline heat dissipation device, provided with a capillary phase change heat conduction cavity and a liquid flow heat dissipation cavity which are attached to each other. The capillary phase change heat conduction cavity is of a sealed structure. A liquid inlet tube and a liquid outlet tube are sealedly connected to the liquid flow heat dissipation cavity. The liquid flow heat dissipation cavity is an immersion-type microcrystalline liquid flow heat dissipation cavity. A microcrystalline copper powder electroplated layer is provided on the bottom surface of an inner cavity of the immersion-type microcrystalline liquid flow heat dissipation cavity. In the 3D microcrystalline heat dissipation device, gas-liquid phase change is carried out by means of a refrigerant inside the capillary phase change heat conduction cavity, so that heat of a heat source is conducted to the liquid flow heat dissipation cavity, and then the heat is carried to the outside by the flowing refrigerant in the liquid flow heat dissipation cavity, thereby achieving an efficient heat dissipation effect.

This invention relates to the field of coating technology, specifically to a protective coating for stone surfaces with good waterproof performance and its preparation method, comprising the following steps: S1. Treating microcrystalline cellulose to obtain product 1 for later use; S2. Reacting product 1 from step S1 with titanium tetrachloride to obtain nano-titanium dioxide for later use; S3. Mixing the nano-titanium dioxide from step S2 with sodium oleate and adjusting the pH to 6.5-7.5 to obtain product 2 for later use; S4. Performing surface synergistic hydrophobic modification treatment on product 2 to obtain functional filler. This invention discloses a protective coating for stone surfaces with good waterproof performance, using fluorinated acrylic resin as the base resin, incorporating functional filler, and combining it with a curing agent, mixed solvent, defoamer, and leveling agent. Through the synergistic effect between the components, this protective coating for stone surfaces possesses good waterproof performance as well as good resistance to ultraviolet aging and acid corrosion.

The invention relates to the technical field of solar cells, and mainly provides a solar cell and a preparation method thereof. The solar cell comprises a silicon substrate with a light incident surface and a backlight surface which are oppositely arranged; the first intrinsic amorphous silicon layer and the first doping layer are located on the light incident surface and are sequentially stacked in the direction away from the silicon substrate; wherein the first doping layer comprises a nanocrystalline silicon oxide layer; the second intrinsic amorphous silicon layer, the second doping layer and the second transparent conductive oxide layer are located on the backlight surface and sequentially stacked in the direction away from the silicon substrate; wherein the second doping layer comprises a first microcrystalline silicon oxycarbide layer, a second microcrystalline silicon oxycarbide layer and a third microcrystalline silicon oxycarbide layer which are sequentially stacked in the direction away from the silicon substrate. According to the technical scheme, the solar cell is beneficial to migration of carriers, and the current density and the photoelectric conversion efficiency of the solar cell can be improved.