188 results about "Magnesium fluoride" patented technology

The invention relates to the technical field of glass welding, in particular to a clamping device for metal-glass laser welding and a welding method. The device comprises a bottom plate, a cover frame and supporting columns connecting the bottom plate and the cover frame, and a lifting part is formed between the cover frame and the bottom plate. A mechanical lifting assembly with an adjusting rocker and a graduated scale is installed on the bottom plate in the lifting part, the lower end is connected with the bottom plate, and the upper end is connected with the machining table to drive the machining table to ascend and descend. And the center of the cover frame is provided with a quartz glass pressing plate plated with a magnesium fluoride antireflection film. A cylindrical metal mounting base coaxial with the glass pressing plate is arranged on the machining table and used for mounting metal to be welded. During welding, the adjusting rocker is rocked to lift the machining table so that to-be-welded glass can make contact with the glass pressing plate, and optical contact is achieved by observing the situation that an interface Newton ring disappears from appearing; the whole clamping device is moved to a laser machining platform, and welding is conducted through a glass pressing plate; and after completion, the machining table is lowered to disassemble the weldment.

An electrolyte solution for a lithium secondary battery is provided, comprising a lithium salt, a nonaqueous organic solvent with at least 50% FSA by volume, and a silver (Ag) compound additive selected from AgHFB, AgPFP, or silver trifluoroacetate. The additive is present in an amount of about 0.05 wt % to 0.2 wt % to promote stable SEI layer formation and reduce lithium deposition overvoltage. The solution may also include a secondary additive such as calcium hydride (CaH2) or magnesium fluoride (MgF2) to further suppress lithium dendrite growth. The lithium secondary battery incorporating this electrolyte is designed to form a lithium metal layer with a thickness of 40 to 45 μm and a surface pore average diameter of less than 1 μm during the initial charging process, optimizing performance and stability.

A hydrocarbon gas detection system including a longwave infrared camera, a spectral filter, and a computation unit. The spectral filter is disposed in the light path of the camera sensor. The spectral filter is made of a material selected from the group consisting of calcium fluoride, zinc sulfide, magnesium fluoride, and silicon. The computation unit is arranged to process image data of the longwave infrared camera for the hydrocarbon gas detection.

The invention discloses a near-net-shape preparation process of high-light-transmittance large-size magnesium aluminate spinel ceramic, and belongs to the technical field of preparation of high-performance transparent ceramic. The process comprises the following steps: firstly, mixing magnesium aluminate spinel raw material powder with a lithium-free composite sintering aid according to a mass ratio, wherein the composite sintering aid consists of magnesium fluoride, ytterbium fluoride and ytterbium oxide according to a molar ratio; performing cold isostatic pressing on the mixed powder to prepare a preformed blank, crushing, and performing high-low pressure circulation pressurization near-net forming. The obtained green body is firstly subjected to hot pressing and presintering, then placed in a fluorine-containing atmosphere to be treated and finally subjected to hot isostatic pressing sintering, and a finished product is obtained through aftertreatment. According to the technology, the bottleneck of large-size component preparation is successfully overcome, net forming of the magnesium aluminate spinel ceramic with the diagonal size larger than 400 mm is achieved, the light transmittance of a finished product in the wavelength range of 400 nm to 800 nm exceeds 93%, the breaking strength reaches 194 MPa or above, and meanwhile the raw material cost and equipment dependence are remarkably reduced.

The embodiment of the invention provides a friction material composition, a brake lining, a preparation method of the brake lining, a brake and a vehicle. The friction material composition comprises the following raw materials in parts by weight: 2-10 parts of a fluoride mixture, 8-15 parts of graphite, 8-12 parts of phenolic resin, 4-12 parts of a metal oxide, 15-40 parts of a fiber material and 20-40 parts of other fillers, wherein the fluoride mixture comprises at least two of calcium fluoride, barium fluoride, cerium fluoride, aluminum fluoride, magnesium fluoride, potassium fluoride, sodium fluoride, beryllium fluoride and manganese fluoride. The brake lining prepared from the friction material composition can solve the problems of high wear rate and heat fading at the same time, the service life of the brake lining is prolonged, and the braking effect is improved.

The invention provides a preparation method of alpha, omega-diiodo perfluoroalkane, and belongs to the technical field of iodo perfluoroalkane synthesis. The preparation method disclosed by the invention comprises the following steps: under a protective atmosphere, enabling a nano flower type magnesium fluoride catalyst, 1, 2-diiodo tetrafluoroethane and tetrafluoroethylene to react, so as to obtain 1, 4-diiodo perfluorobutane and 1, 6-diiodo perfluorohexane. The nano flower type magnesium fluoride catalyst has high specific surface area and abundant coordination unsaturated sites, can effectively activate reactant molecule bonding sites, and avoids the problems of side reaction and catalyst deactivation caused by free radical paths; by optimizing the pore structure and reaction conditions of the catalyst, efficient synergistic conversion of IPF-2 and TFE can be realized, and the selectivity and yield of IPF-4 and IPF-6 are remarkably improved. The method provided by the invention has the advantages of mild conditions, safe operation, adjustable product distribution and the like, and meets the requirements of industrial production on high-selectivity fluorine-containing bifunctional compounds.

Magnetic particles with a highly reflective protective membrane (300), comprising: a magnetic core (100), a shell (200) formed on the outer surface of the magnetic core (100), having a multi-layer structure and comprising a first shell (210) made of a dielectric material, and a second shell (220) made of metallic material, formed on the outer surface of the first shell (210) and being a multi-layer membrane in which two or more layers (221, 222, 223) of mutually different metallic materials are stacked on top of each other, and a highly reflective protective membrane (300) which is in contact with the second shell (220) and is formed on the outer surface of the shell (200), wherein the highly reflective protective membrane (300) comprises a multi-layer structure comprising a low refractive index membrane (310) formed on the outer surface of the shell (200) and having an optical thickness between 0.15 to 0.35 of the wavelength, and a high refractive index membrane (320) formed on the outer surface of the low refractive index membrane (310) and having an optical thickness between 0.15 to 0.35 of the wavelength, the dielectric material is one or more materials selected from a group comprising titanium dioxide, aluminum oxide, calcium carbonate, zirconium oxide, magnesium fluoride, zinc oxide and zinc sulfide, the metallic material is one or more materials selected from a group comprising copper, nickel, gold, platinum, silver, aluminum and chromium, the low refractive index membrane (310) consists of one or more materials selected from a group comprising silicon dioxide, magnesium fluoride, polystyrene, polymethyl methacrylate, polystyrene-co-butadiene, vanadium pentoxide, cadmium oxide, polyisobutylene and polyethylene, and the high refractive index membrane (320) consists of one or more materials selected from a group comprising titanium dioxide, aluminum oxide, zinc oxide, zirconium oxide and chromium oxide.

The invention relates to the technical field of lithium ion batteries, in particular to a nickel cobalt lithium manganate positive electrode material and a preparation method thereof. According to the invention, the technical problems of poor cycle performance and low specific capacity of the existing nickel cobalt lithium manganate positive electrode material are solved. The preparation method comprises the following steps: synthesizing precursor powder by adopting a coprecipitation process; then carrying out high-shear mixing on the precursor, lithium hydroxide, nano niobium oxide and magnesium fluoride; after the mixed material is subjected to pre-oxidation and high-temperature oxygen-enriched gradient sintering, a gradient reduction etching process is adopted in the cooling stage, and strong wind quenching is matched for surface shaping; and finally, carrying out air jet pulverization and demagnetization to obtain the nickel cobalt lithium manganate positive electrode material. According to the method, lattice respiration stress is effectively dissipated by constructing a radial ordered structure, a bulk phase structure is stabilized through multi-element synergistic doping, interfacial ion transport kinetics is optimized through reduction-induced surface oxygen vacancies and a lattice distortion layer, and the synergistic strategy ensures high stability of the material structure and meanwhile, the material structure has a good application prospect. And the de-intercalation efficiency of the active lithium is greatly improved.

The invention belongs to the field of electronic packaging materials, and particularly relates to a high-thermal-conductivity ceramic material for LED packaging and a manufacturing process of the high-thermal-conductivity ceramic material for LED packaging. The high-thermal-conductivity ceramic material is prepared from silicon nitride, aluminum nitride, magnesium fluoride, yttrium fluoride, lithium carbonate and two newly-designed modified compounds. The phase change regulator is composed of a boron-doped rare earth silicate nanocrystalline phase change regulator and a bimetallic chalcogenide compound interface modifier according to a specific weight part ratio. The preparation process mainly comprises the following steps: ball-milling and mixing the components, drying, granulating, and carrying out segmented hot pressed sintering in a protective atmosphere to finally obtain the compact ceramic material. The high-power LED packaging structure is particularly suitable for packaging of high-power LEDs, and the technical problem that heat dissipation and mechanical performance are difficult to consider at the same time is effectively solved.

A window according to one or more embodiments of the present disclosure includes a base layer, a first layer on the base layer, a second layer below the base layer, a third layer on the first layer, and a fourth layer on the third layer, each of the first and second layers including magnesium oxide (e.g., MgO), magnesium fluoride (e.g., MgF2), and yttrium oxyfluoride (e.g., YOF). In addition, a display device and an electronic device including the window are also provided.

This invention discloses a method for deep removal of calcium and magnesium from battery-grade manganese sulfate solution, belonging to the field of hydrometallurgical technology. The invention employs a three-stage purification process: pretreatment for impurity removal, gradient precipitation with manganese fluoride, selective extraction, and chelating resin refinement. First, the manganese sulfate leachate undergoes pretreatment to remove iron, aluminum, and heavy metals. Then, an in-situ / direct addition of manganese fluoride precipitation system using magnesium fluoride seeding and gradient fluoride supplementation efficiently removes most calcium and magnesium impurities from the solution, achieving a single-precipitation rate of over 93% for magnesium ions. Subsequently, a P507 / Cyanex272 / TBP compound saponification organic system is used with a reverse extraction logic of "extracting calcium and magnesium while retaining manganese in the aqueous phase" to precisely remove residual calcium and magnesium, avoiding the problems of competition between manganese and calcium and low magnesium extraction efficiency in traditional extraction methods. Finally, trace amounts of calcium, magnesium, and residual fluoride ions are completely removed through aluminum salt complexation for fluoride removal combined with deep refinement using aminocarboxylic acid chelating resin. This invention introduces no foreign impurities such as sodium and ammonium throughout the entire process, has a wide process window and strong industrial stability, and the final purified manganese sulfate solution can stably meet the high-end battery-grade index requirements of Ca²⁺≤5mg / l, Mg²⁺≤5mg / l, and F⁻≤1mg / l, making it suitable for the large-scale production of high-purity manganese sulfate, a raw material for lithium battery cathodes.

When an anti-reflective coating, conventionally applied to glass lenses, is applied to a plastic lens, the difference in thermal expansion between the plastic substrate and the anti-reflective coating causes significant expansion of the plastic substrate in high-temperature environments. This leads to a problem where the anti-reflective coating cannot keep up with the expansion of the substrate and is prone to fracture (cracking). Therefore, we aim to realize a new optical thin film that achieves both the desired optical properties and the suppression of crack formation. [Solution] The optical thin film of this disclosure includes one or more MO mixed layers (11) in which organometallic compounds are mixed within a layer formed by the physical deposition of magnesium fluoride.

The invention belongs to the technical field of electrical equipment insulating materials, and particularly relates to a short-wave sensitive type high-light-transmittance composite insulating material and a preparation method thereof. The short-wave sensitive high-transmittance composite insulating material comprises the following components in percentage by mass: 55-65% of epoxy resin, 30-40% of modified aluminum oxide filler, 2-5% of an interface enhancer and 3-5% of a curing agent, wherein the modified aluminum oxide filler is aluminum oxide particles of which the surfaces are coated with nanoscale magnesium fluoride coatings; the interface reinforcing agent is a compound of a silane coupling agent and polyvinyl alcohol.

An optical device includes, in sequence, a surface formed of a metal oxide, a samarium oxide-containing layer in contact with the surface formed of a metal oxide, and a magnesium fluoride-containing layer in contact with the samarium oxide-containing layer so as to suppress optical absorption resulting from high-rate sputter deposition of a magnesium fluoride-containing layer on a surface formed of a metal oxide.

An object is to provide a method for manufacturing a positive electrode active material that achieves high powder properties and high load resistance (e.g., rate performance and output resistance) when used in a lithium-ion secondary battery, within a short manufacturing cycle time and at low cost. To perform heat treatment at temperatures lower than the melting point of magnesium fluorine, lithium fluoride is mixed to melt magnesium fluorine and modify the surface of lithium cobalt oxide powder. By mixing lithium fluoride, magnesium fluorine can be melted at a temperature lower than its melting point, and a positive electrode active material is formed utilizing this eutectic phenomenon.

The present application relates to the technical field of nuclear fuel cycle, and particularly relates to a method for recycling uranium fluorination wastewater. The method is as follows: adjusting the concentration ratio of bicarbonate and carbonate in the uranium conversion leaching solution, carrying out decolorization and filtration treatment to obtain a filtrate; the filtrate is subjected to uranium adsorption through a resin, and the resin adsorbed with uranium is subjected to leaching; the adsorption tail liquid is added with magnesium hydroxide slurry to adjust the pH to above 11, and then filtered, and the filtrate is adsorbed by amidoamine-based adsorption fiber; the adsorption tail liquid is added with magnesium carbonate slurry to generate magnesium fluoride and carbonate ions, and then filtered to obtain a sediment and a filtrate respectively; the filtrate is returned as a leaching agent of fluorination tail gas or is discharged after treatment; the sediment is used together with new magnesium carbonate to participate in fluorine removal reaction again, and the unreacted magnesium carbonate is used again. The present application realizes efficient recovery of uranium in the leaching solution and recycling of the leaching solution, fully utilizes the residual alkali in the returned liquid, reduces the treatment cost of fluorination tail gas, controls the radioactivity of the waste residue, and realizes radioactivity exemption of the treated sediment.

This invention relates to the field of co-processing and resource utilization of fluorine- and silicon-containing solid waste, specifically disclosing a high-quality, tiered resource utilization process for fluorosilicone slag. This process uses fluorosilicone slag as raw material, sequentially undergoing alkali dissolution activation, acidification polymerization, primary defluorination crystallization, secondary deep defluorination, and salt resource recovery steps to produce washed silica, magnesium fluoride, cryolite, and sodium sulfate, while simultaneously achieving mother liquor recycling and wastewater reduction. This invention features a short process flow, closed-loop material circulation between units, and a SiO2 recovery rate of over 95% in the fluorosilicone slag. The silica, magnesium fluoride, cryolite, and sodium sulfate products meet relevant national or industry standards, achieving high-quality, tiered resource utilization and overall wastewater reduction for fluorosilicone slag.

The application provides a high-thermal-conductivity radiation refrigeration coating for a 5G communication base station cabinet and a preparation method thereof, and belongs to the technical field of coatings. A SiC@BN / TiB2 three-phase fiber framework obtained through three-stage calcination is bonded with methylphenyl silicone resin through a silane coupling agent to form a longitudinal high-speed thermal conduction framework. Starburst calcium titanate and edge in-situ magnesium fluoride form a refractive index ladder and a rough multi-faceted structure, which not only reflects ultraviolet-near infrared light, but also endows weather resistance. Holmium / ytterbium co-doped calcium fluoride nanosheets are transversely overlapped to scatter near infrared light and convert the near infrared light into medium-far infrared radiation which can penetrate the atmospheric window, thereby further dissipating heat. Through mutual cooperation of a longitudinal continuous heat conduction path, a transverse heat dissipation network, optical multiple scattering and energy downshift radiation, stable chemical bond network support is achieved to realize high-efficiency, long-term reliable heat dissipation performance.

The application belongs to the field of optical film and surface engineering, and provides a hydrophilic magnesium fluoride film preparation method based on magnetron sputtering, which realizes effective regulation and control of the hydrophilic performance of the magnesium fluoride film surface through sputtering power and maintains good optical transmittance. In the application, first, the substrate is subjected to ultrasonic cleaning treatment, then the substrate is placed in a vacuum chamber of a magnetron sputtering device, magnesium fluoride is used as target material, and the vacuum chamber is vacuumized to a base vacuum degree; then, inert gas is introduced into the vacuum chamber, the sputtering power is adjusted to 20-50 W, and the magnesium fluoride film is deposited on the substrate surface in a radio frequency magnetron sputtering mode; the application realizes continuous regulation and control of the hydrophilic performance of the magnesium fluoride film surface by regulating and controlling the sputtering power; with the increase of the sputtering power, the surface roughness of the film increases, the water contact angle significantly decreases, and the hydrophilicity is enhanced; and the method does not introduce additional materials, has simple process and good repeatability, and the prepared magnesium fluoride film maintains high transmittance in the visible light range.

The invention discloses a hydrogenation catalyst which is a supported catalyst, the catalyst is in a particle shape, the particles are porous metal fluoride embedded with palladium element, the porous metal fluoride is selected from one or more of aluminum fluoride, chromium fluoride, magnesium fluoride, barium fluoride, calcium fluoride, aluminum fluoride oxide and chromium fluoride oxide, and the palladium element is one or more of aluminum fluoride, chromium fluoride, magnesium fluoride, barium fluoride, calcium fluoride, aluminum fluoride oxide and chromium fluoride oxide. The invention also provides a preparation method of the catalyst. According to the catalyst prepared by the method, the synthesis yield and conversion rate are high in the process of synthesizing HFC-236ea from C3F6 and synthesizing HFC-245eb from HFO-1225ye, and the product purity and yield are excellent. According to the catalyst used in the invention, aluminum oxyfluoride is used as a carrier of metal palladium, Pd particles and a carrier interface are tightly combined, and a falling sign does not appear, so that the Pd component is excellent in dispersity, and the reaction rate and the raw material conversion rate are favorably improved.

The invention relates to the technical field of fluorine-containing and silicon-containing solid waste co-processing and resource utilization, and particularly discloses a fluorine-silicon slag gradient high-quality recycling process. According to the process, the fluorine-silicon slag is used as a raw material and is sequentially subjected to the steps of alkali dissolution activation, acidification polymerization, first-stage fluorine removal crystallization, second-stage deep fluorine removal and salt resource recovery, products such as washed white carbon black, magnesium fluoride, cryolite and sodium sulfate are prepared, and meanwhile mother liquor recycling and wastewater reduction are achieved. According to the method, the technological process is short, closed-loop circulation of materials is achieved among the units, the recovery rate of SiO2 in the fluorosilicon slag can reach 95% or above, white carbon black, magnesium fluoride, cryolite and sodium sulfate products meet relevant national or industrial standard requirements respectively, and gradient high-quality recycling and whole-process reduction of the fluorosilicon slag are achieved.

The invention relates to a method for treating aluminum electrolysis hazardous waste by using magnesium oxide, which comprises the following steps: carrying out pretreatment such as crushing and screening on the aluminum electrolysis hazardous waste, and then mixing with a proper amount of magnesium oxide; and adding ammonia water into the prepared alkaline solution, selectively leaching the mixed material, and filtering to obtain a lithium-containing leachate and a magnesium fluoride product. An alkaline solution serves as a leaching agent, magnesium oxide serves as a fluorine trapping agent, ammonia water serves as a magnesium ion activating agent, efficient treatment of fluorine and lithium resources in the waste aluminum electrolyte is achieved, lithium enters a liquid phase to be recycled, magnesium, fluorine and the like enter a slag phase in the form of magnesium fluoride, the purity is high after weak acid washing, and the waste aluminum electrolyte can be directly sold.

The invention relates to the technical field of coatings, and provides an aerogel heat insulation coating and a preparation method thereof.The aerogel heat insulation coating is prepared from, by weight, 8-12 parts of water, 15-25 parts of waterborne silicone acrylic emulsion, 12-20 parts of styrene acrylic emulsion, 3-5 parts of chopped fibers, 12-16 parts of hollow glass beads, 12-18 parts of silicon dioxide aerogel, 2.3-3.6 parts of filler, 4-7 parts of flame retardant and 1.6-4 parts of auxiliaries; the filler is prepared from titanium dioxide, aluminum oxide and modified magnesium oxide in a mass ratio of 0.8: 1.2: (0.6-1.4); the modified magnesium oxide is magnesium fluoride coated magnesium oxide. By means of the technical scheme, the problem that in the prior art, an aerogel heat insulation coating is insufficient in heat insulation performance is solved.

This invention discloses a mid-to-far-infrared ultra-wideband neutral beamsplitter based on KBr crystal, its fabrication method, and its applications, relating to the field of optical thin film technology. The KBr crystal-based mid-to-far-infrared ultra-wideband neutral beamsplitter includes a KBr crystal substrate; a front surface adhesive layer disposed on the front surface of the KBr crystal substrate; an ultra-wideband neutral beam splitter disposed on the surface of the front surface adhesive layer; a rear surface adhesive layer disposed on the rear surface of the KBr crystal substrate; and an ultra-wideband protective film disposed on the surface of the rear surface adhesive layer. The front and rear surface adhesive layers are both magnesium fluoride thin films; the ultra-wideband neutral beam splitter has a multilayer dielectric film structure; and the ultra-wideband protective film is a barium fluoride thin film. This invention innovatively introduces a double-sided composite thin film structure of "front surface adhesive layer + beam splitter system" and "rear surface adhesive layer + protective layer".

The invention belongs to the field of manganese sulfate solution purification and impurity removal, and discloses a low-cost method for adsorbing and purifying calcium and magnesium in a manganese sulfate solution, which comprises the following steps: (1) at normal temperature, firstly adding a fluorinating agent into the manganese sulfate solution to be subjected to calcium and magnesium purification, stirring for reaction, standing, and reserving calcium fluoride and magnesium slag at the bottom; and (2) adding a manganese sulfate solution of calcium and magnesium to be purified and a fluorinating agent into the calcium magnesium fluoride slag, stirring for reaction, standing, and reserving the calcium magnesium fluoride slag at the bottom for reuse. According to the method, the newly generated calcium fluoride magnesium slag is used for adsorbing and purifying calcium and magnesium in the manganese sulfate solution, a fluorinating agent can be efficiently utilized, steam heating is not used, the using amount of the fluorinating agent is reduced, meanwhile, the steam using cost is saved, the production cost of high-purity manganese sulfate is greatly reduced, operation is easy, and the adsorption and purification efficiency is high.

The present application relates to the technical field of underwater curable sealant, in particular to an underwater curable polyurethane sealant and a preparation method thereof.An underwater curable polyurethane sealant comprises glue, dioctyl terephthalate, wetting dispersant, water removing agent, thixotropic agent, filler, magnesium fluoride, carbon black and ultraviolet absorber; wherein the glue comprises the following raw materials in mass fraction: polyoxyethyl polyoxypropyl glycerol ether, polypropylene glycol, bio-based polyol, isocyanate propyl triethoxy silane, diphenyl methane diisocyanate, drier, coupling agent, defoaming agent, diluent and latent curing agent.The underwater curable polyurethane sealant of the present application can not only be quickly cured underwater, but also can quickly form a stable bonding interface after being cured underwater, effectively resist the penetration of water molecules, thereby ensuring long-term sealing effect and structural stability.

The invention discloses a preparation method of a low-oxygen magnesium fluoride crystal, and belongs to the technical field of crystal preparation. After the raw materials are molten, the mixed gas activated by the catalytic net is introduced into the crystal furnace in an intermittent pulse mode, active fluorine species in the mixed gas and oxygen impurities on the surface of the melt can be subjected to fluorination reaction so as to reduce the content of the oxygen impurities, airflow in the intermittent pulse ventilation mode is matched with rotation of the crucible to disturb the melt, a reaction interface is updated, and the reaction efficiency is improved. And finally, the low-oxygen magnesium fluoride crystal is obtained through a pulling method.

The application discloses a method for plating a magnesium fluoride film with nitrogen ion assistance, and relates to the field of vacuum plating, and comprises the following steps: preparing a vacuum cavity for plating; a substrate and magnesium fluoride material are arranged in the vacuum cavity; the temperature in the vacuum cavity is lower than 250 DEG C; preparing an ion source; the ion source is communicated with the vacuum cavity; nitrogen gas is filled into the ion source, and the nitrogen gas is ionized into nitrogen ions in the ion source; the nitrogen ions are introduced into the vacuum cavity, and the magnesium fluoride material is deposited on the surface of the substrate under the assistance of the nitrogen ions to form a magnesium fluoride film. The method for plating a magnesium fluoride film with nitrogen ion assistance provided in the specification can significantly reduce the lower limit of stress of the film layer and increase the adjustment window of the process.

The application discloses a kind of high-temperature-resistant, shear-resistant optical discoloration pigment and its application in plastic, the optical discoloration pigment includes: at least one metal layer and flexible buffer layer between metal layer;Metal layer includes alternately deposited reflection layer and dielectric layer;The reflection layer material is at least one of aluminum, titanium, silver, copper, nickel, platinum or chromium, and the dielectric layer material is at least one of silicon dioxide, titanium dioxide, aluminum oxide, aluminum fluoride or magnesium fluoride;The flexible buffer layer material is at least one of butadiene styrene rubber, organic silicon elastomer or polyolefin.The application breaks through the application bottleneck of traditional optical discoloration pigment in injection molding process by special film system structure design and surface graft modification, and prepares high-temperature-resistant, shear-resistant optical discoloration pigment suitable for injection molding industry, gives plastic product unique visual effect and high added value, and is expected to become important driving force for product upgrading of injection molding industry.