42results about How to "Improve optical performance" patented technology

The invention discloses a wide-angle lens with a larger hole diameter and a 80 degrees wide vision angle; the wide-angle lens comprises the following elements from the object to the image: a first lens, a second lens, a third lens and a balsaming lens, wherein, the first lens is a negative lens with high refractive index, the first surface of the first lens located at the side of the object is a convexity facing to the object, and the first surface also adopts a non-spherical design; the second lens is a crescent positive lens which is arranged behind an iris(not shown in the figure) and faces to the object, the crescent positive lens is provided with at least one non-spherical face; the third lens is also a crescent positive lens which is provided with at least one non-spherical face; the balsaming lens is made by gluing a fourth lens and a fifth lens and is of plus power. The wide-angle lens satisfies a particular condition, so the whole length of the lens can be more effectively shortened and the product is compacter.

Provided is a polymerizable quantum dot. The surface of the quantum dot is modified with ligands, and at least one part of the ligands comprise polymerizable groups which can be subjected to copolymerization with other monomers or prepolymers. According to the polymerizable quantum dot, more quantum dots can be dissolved in a high polymer material, the concentration of the quantum dots in the high polymer material can be increased, a better optical property is achieved, and application of the quantum dots is promoted. The invention further provides a quantum dot dispersoid, a quantum dot packaging body, a backlight module, a lighting device and a preparation method of the quantum dot packaging body.

The invention discloses a display module and a display device, and relates to the technical field of display. The display module comprises a cover plate; a display panel, a backlight unit and a metalsleeve, wherein the display panel is arranged on one side of the cover plate; the display panel comprises a hollow part, a first non-display area, display area and the second non-display area; the first non-display area surrounds the hollow part; the display area surrounds the first non-display area; the second non-display area surrounds the display area; the backlight unit is arranged on one side, far away from the cover plate, of the display panel; the backlight unit comprises a backlight hole which corresponds to the hollow part and penetrates through the backlight unit in the thickness direction of the backlight unit; the backlight unit further comprises an iron frame, wherein the iron frame comprises a main body part corresponding to the display area and a first bent part arranged around the inner side wall of the backlight hole; and the metal sleeve is arranged between the first bent part and the cover plate and is arranged around the inner side wall of the backlight hole. Therefore, the first bent part and the metal sleeve are arranged on the inner side wall of the backlight hole, so that the display module is beneficial for improving the light leakage problem in the corresponding positions of the backlight hole and the hollowed part.

The invention discloses a quantum dot diaphragm comprising a quantum dot layer. The quantum dot layer comprises a high-molecular material and quantum dots which are uniformly distributed in the high-molecular material. The quantum dot diaphragm is characterized in that the high-molecular material also comprises a microstructure body which is used for controlling a thickness of the quantum dot layer and has a preset particle size. The quantum dot diaphragm has good uniformity and can be thinner. The microstructure in the quantum dot diaphragm can diffuse particles and thus enhance optical performance of the quantum dot diaphragm. The invention also discloses an optical member, a backlight module, a quantum dot diaphragm and a preparation method for the same.

Providing a zoom lens system having a high zoom ratio being compact with high optical performance. The system includes, in order from an object along an optical axis, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, at least one lens group having positive refractive power, and an n-th lens group GN being disposed to the most image side. The n-th lens group GN with positive refractive power includes, in order from the object, a front group GNa and a rear group GNb having positive refractive power. Focusing on an object is carried out by moving the rear group GNb along the optical axis, and a given conditional expression is satisfied.

The present invention discloses a preparation method of a colorless transparent polyimide film. The preparation method comprises: under the protection of nitrogen gas, adding an aromatic dianhydride and an aromatic diamine in a polar aprotic solvent according to a molar ratio of 1:1, and carrying out a condensation polymerization reaction to obtain a polyamic acid solution; cooling to a temperature of -30 to -10 DEG C, adding an imidization reagent to the polyamic acid solution, carrying out stirring mixing, and carrying out defoaming treatment; and casting the defoamed solution onto a support body, drying, and carrying out imidization to obtain the polyimide film. According to the present invention, by introducing the fluorine element, the sulfone group or the ether bond in the main chain of the polyimide, the co-planarity of the molecular structure can be destroyed, and the light transmittance of the film can be improved; and with the chemical imidization method, the energy consumption can be reduced while the optical property of the film can be improved.

Apparatuses, systems and methods for providing improved intraocular lenses (IOLs), include features for reducing side effects, such as halos, glare and best focus shifts, in multifocal refractive lenses and extended depth of focus lenses. Exemplary ophthalmic lenses can include a continuous, power progressive aspheric surface based on two or more merged optical zones, the aspheric surface being defined by a single aspheric equation. Continuous power progressive intraocular lenses can mitigate optical side effects that typically result from abrupt optical steps. Aspheric power progressive and aspheric extended depth of focus lenses can be combined with diffractive lens profiles to further enhance visual performance while minimizing dysphotopsia effects. The combination can provide an increased depth of focus that is greater than an individual depth of focus of either the refractive profile or the diffractive profile

The invention relates to the technical field of optical imaging, and discloses an optical lens. The optical lens successively comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power and a fourth lens group with positive focal power from an object side to an image side along the direction of an optical axis. Through designing the successive arrangement sequence of each optical lens from the object side to the image side, focal power distribution of each optical lens and the like, such parameters as the structural form of a zooming optical lens, focal power distribution, a refractive index of optical glass, a dispersion coefficient and the like are enabled to match imaging conditions well, spherical aberration, coma, astigmatism, field curvature, chromatic difference of magnification and position aberration of the optical lens are well corrected, the optical lens can meet a higher resolution demand and achieve a better infrared night vision effect, all-weather ultrahigh-resolution video monitoring is realized, and the development demand of an ultrahigh-resolution safety protection monitoring system at present and in the future can be satisfied.

An optical image pick-up lens includes an aperture, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in order along an optical axis from an object side toward an image side. The first lens is a positive plastic biconvex lens, the second lens is a negative plastic meniscus lens, the third lens is a positive plastic meniscus lens, the fourth lens is a positive glass meniscus lens, and the fifth lens is a plastic lens. All the surfaces of the first to the fifth lenses are aspheric surfaces. A refractive index of the fourth lens is greater than 1.7. The fifth lens gradually changes from negative to positive from a center, where the optical axis passes through, to an edge.

The invention claims a method for manufacturing a micro lens array based on a digital mask lithography technology. The method comprises the following steps of: equally dividing the height of each lens in the array into n micro elements; calculating the diameter of a plane circular corresponding to each equal stage according to the Pythagorean theorem; performing rounding off to obtain the integer and make the obtained integer be integral multiple of the single pixel of a digital micro mirror device (DMD); and obtaining an exposure image by using an imaging optimization technology, and exposing and developing to obtain an embossment structure of the micro lens array. The method has the advantages of: 1, reducing the error of the device produced by the traditional method in design, making a micro lens have more precise surface profile structure and greatly improving the optical usability of the micro lens array; 2, combining the imaging optimization technologies such as digital real-time, shaping and rotating, improving alignment precision, reducing the data quantity of masks and saving a large storage space; and 3, keeping superfine structures of more lenses so as to ensure less limitation of the shape of the surface of the lens in preparation.

A variable magnification optical system includes, in order from the object side: a positive first lens group (G1); a negative second lens group (G2); a positive third lens group (G3); a negative fourth lens group (G4); and a positive fifth lens group (G5). When changing magnification from the wide angle end to the telephoto end, the first and third lens groups are fixed with respect to an image formation plane, the second lens group moves toward the image side, the fourth lens group moves, and the distance between the fourth and fifth lens groups changes. A rearward lens group (GR) constituted by the third, fourth, and fifth lens groups has a positive refractive power throughout the variable magnification range. The transverse magnification ratio of the fourth lens group when focused on an object at infinity is negative throughout the variable magnification range.

The invention discloses a circuit board flame-retardant anti-rusting paint. The circuit board flame-retardant anti-rusting paint is characterized by being prepared from the following raw materials in parts by weight: 55-60 parts of E-12 epoxy resin, 1-2 parts of zinc powder, 0.8-1.2 parts of tributyl phosphate, 2-3 parts of aminopropyl triethoxysilane. 20-24 parts of amino resin, 2-3 parts of polyvinyl alcohol, 1-2 parts of aluminum hydroxide, 8-12 parts of diatomite, 30-35 parts of polyesteracrylate, 1-2 parts of triethanolamine, 3-4 parts of mica powder, 2-3 parts of polyisobutene, 14-18 parts of ethyl acetate and 3-4 parts of dispersing aid. According to the circuit board flame-retardant anti-rusting paint disclosed by the invention, the dispersing aid can be used for improving the optical performance, so that the paint is uniformly dispersed and the stability of the paint is kept. The circuit board flame-retardant anti-rusting paint disclosed by the invention has extremely strong corrosion resistance and rusting resistance for metals, is high-temperature-resistant and flame-retardant, can be used for overcoming the defects of the conventional epoxy paint, and is simple in preparation process and especially suitable for being used as a protective paint of metals.

The invention relates to a preparation method and application of a hypochloric acid-responsive fluorescence sensing material, belonging to the technical field of chemiluminescence sensing materials. The hypochloric acid-responsive fluorescence sensing material provided by the invention is a chemiluminescence sensing material prepared through an electrophilic substitution reaction with coumarin-6-carboxylic acid and thiosemicarbazide as basic raw materials and absolute methanol as a solvent. The fluorescence sensing material prepared in the invention has good water-solubility and biocompatibility, is rapid in response, and can realize sensitive and selective recognition of OCl<->; the changes of fluorescence signals are visible to naked eyes under the illumination of an ultraviolet lamp; interference caused by other common negative ions and active oxygen substances is small; and the fluorescence sensing material successfully realizes imaging of target ions in biological cells.

The invention discloses an adhesive for an iodine polarizer, a preparation method of the adhesive and the iodine polarizer. The adhesive is prepared from the following components in percentage by weight: 1.9-7 percent of an adhesive raw material, 90-97 percent of pure water, 0.2-0.5 percent of a crosslinking agent, 0.1-3.5 percent of EXP, 0.2-0.5 percent of ethylene glycol and 0.1-1 percent of glyoxal. With adoption of the adhesive, the purpose that the iodine polarizer is durable in the performance is achieved. After the adhesive is adhered to a PVA film, in the drying process, iodine ions in the PVA film can be better fixed and kept in an ordered chain state under the condition of 95 DEG C*500H and high temperature and high humidity of 65 DEG C*95 percent*1000H, so that the variation of the optical stability of the polarizer is no larger than 5 percent after and before a test under the conditions, the application range of the corresponding iodine polarizer is expanded, and the optical performance of an electronic product which applies the iodine polarizer is also improved.

The invention discloses antirust paint for a circuit board. The antirust paint is characterized by being prepared from the following raw materials in parts by weight: 30-35 parts of alkyd resin, 40-45 parts of E-12 epoxy resin, 12-15 parts of amino resin, 10-14 parts of xylene, 2-3 parts of anilino-methyl-triethoxysilane, 1-2 parts of an antioxidant 1010, 12-14 parts of sepiolite, 2-3 parts of polyglycerol fatty acid ester, 1-2 parts of phenyl trichlorosilane, 1-2 parts of zirconium oxide, 1-2 parts of titanium dioxide, 1-2 parts of sodium hydrogen carbonate, 2-3 parts of tung oil, 10-12 parts of ethyl acetate and 3-4 parts of a dispersing auxiliary. The dispersing auxiliary improves the optical property, so that the paint is uniformly dispersed, and the stability of the paint is maintained. The paint disclosed by the invention is firm in interlayer bonding, good in overbaking performance, good in decorativeness, low in cost and high in hardness, and has good decorative effect and wear resistance.

The invention discloses a switch cabinet spraying priming paint. The switch cabinet spraying priming paint is prepared by using the following raw materials, by weight, 40-45 parts of polyurethane acrylate, 23-28 parts of epoxy acrylate, 3-4 parts of titanium dioxide, 2-3 parts of hydrophobic silica, 2-3 parts of zinc cyanurate, 3-4 parts of zinc oxide, 2-3 parts of alum powder, 1-2 parts of isopropyl thioxanthone, 3-4 parts of benzoin bis-methyl ether, 1-2 parts of methyl methacrylate, 3-5 parts of ethylene glycol ethyl ether acetate, 8-10 parts of dipentaerythritol hexaacrylate, 7-9 parts of ethyl acetate and 3-4 parts of a dispersion assistant. The dispersion assistant improves the optical performance, makes the paint uniformly dispersed and maintains the stability of the paint. The switch cabinet spraying priming paint has the advantages of sagging resistance, abundant films, strong adhesion, rapid solidification, and substantial improvement of the work efficiency.

The invention discloses a method for improving the optical performance of paper through a composite structure of stuffing and fiber and belongs to the technical field of paper making. The method comprises the steps that (1) pulp is disintegrated and dehydrated, and therefore size is manufactured; (2) the stuffing is manufactured into stuffing suspension liquid, and the stuffing suspension liquid is fully stirred and dispersed; (3) the stuffing suspension liquid is mixed with the size, water is added for dilution until the system total solid content concentration ranges from 9% to 12%, and then a mixed size is obtained; (4) size grinding is conducted on the mixed size until the final beating degree of the mixed size ranges from 30 oSR to 50 oSR; (5) firstly, the mixed size obtained after size grinding is diluted until the concentration ranges from 0.1% to 0.3%, secondly, a retention aid is added, and finally, formed wet paper is squeezed and dried. According to the paper, manufactured according to the method, with stuffing, on the premise that the strength performance of the paper is not changed, the whiteness and the light scattering coefficient of the paper can be effectively increased, and the effect of improving the optical performance is achieved.

The invention provides a hafnium diboride-zirconium diboride-based high-temperature solar energy absorbing coating and a preparation method thereof. The hafnium diboride-zirconium diboride-based high-temperature solar energy absorbing coating is composed of two layers of films and sequentially comprises an absorbing layer and an anti-reflection layer upwards from the substrate surface; and the absorbing layer is constituted by a composite ceramic thin film prepared from hafnium diboride, hafnium dioxide, zirconium diboride and zirconium dioxide, and the anti-reflection layer is constituted byaluminum oxide. The hafnium diboride-zirconium diboride-based high-temperature solar energy absorbing coating provided by the invention has the high visible-infrared spectrum absorptivity, the low infrared spectrum emissivity and good heat stability, a preparation process of the coating is simple and convenient, operation is convenient, control is easy, and the production period is shortened.

The invention discloses a nanometer antifouling coating liquid. The preparation raw materials comprise the following components: tetraethyl orthosilicate, organic modifiers, deionized water, organic solvents, and catalysts. After the nanometer antifouling coating liquid coats the surface of a photovoltaic glass substrate, a firm nanometer antifouling coating with a thickness of about tens of nanometers can be formed on the surface of the photovoltaic glass substrate in a self-assembly manner, the nanometer antifouling coating is colorless, odorless, smooth and transparent, and has the properties which are similar to those of a lotus leaf surface, such as good water resistance, oil proofness, anti-fouling performance and the like. Most of polar groups such as silicon hydroxyl in the photovoltaic glass substrate are isolated from the outside world by the nanometer antifouling coating, and dust is not easy to accumulate on the surface of a photovoltaic power generation panel inclined at an angle of a certain degree under the protection of the nanometer coating, so that the difficulty and frequency of cleaning the photovoltaic power generation panel are reduced, operation and maintenance costs of a photovoltaic power station are reduced, and the yield rate of the photovoltaic power generation is improved.

Provided are: an optical communication lens which exhibits improved formability, is capable of suppressing contamination and the like during the production step, and reduces costs; an optical communication module using the same; and a molding die. After the material cools, a movable mold (MM) is displaced so as to integrally move away from a fixed mold (FM). During this displacement, the contact surface (FM3) of the fixed mold (FM) is positioned at Δ2=L/10 to L/2 in the optical axis direction from the innermost point of the fixed mold (FM); hence, the molded product is stuck to the movable-mold (MM) side. Also, even if for example a burr is formed along the parting line, there is little risk that the broken burr would adhere to the optical surface of the lens. Furthermore, the contact surface (FM3) of the fixed mold (FM) is positioned at Δ2=L/10 to L/2 in the optical axis direction from the innermost point of the fixed mold (FM); hence, it is possible to separate the gate (GT) from the optical surface (S2), and when cutting the gate and performing the polishing treatment, the adhesion of plastic bits and polished material to the optical surface (S2) is suppressed.

The invention discloses an image obtaining method based on a lens with two integrated segments and a camera body with a single offset sensor, wherein digital images are obtained by an image obtaining system. The image obtaining system comprises the camera body (1) and the lens (2), wherein the image sensor (13) is arranged in the camera body and deviated from the axis of a circular opening; the integrated lens (2) of a two-segment structure is composed of the front segment (22) and the rear segment (21); the rear segment is clamped or fixed with the circular opening of the camera body; the front segment can coaxially rotate relative to the rear segment to switch sub lenses; and the camera body is equipped with a display screen. The image obtaining method based on the lens with the two integrated segments and the camera body with the single offset sensor is easy to implement, and ingenious in conception; and can combine the excellent optical performance of multiple prime lenses with the portability of the structure consisting of one camera body and one lens.

The invention provides a random block type aromatic polycarbodiimide compound which is synthesized from two types of aromatic diisocyanate by condensation reaction and end-capping reaction. The structural formula of the random block type aromatic polycarbodiimide compound is shown in the description. According to the random block type aromatic polycarbodiimide compound, the random structure is formed in random block type aromatic polycarbodiimide, so that the crystallizing degree of a molecular chain structure of polycarbodiimide is reduced; the mechanical properties are obviously improved bybeing compared with those of simple component; the optical property is obviously improved; the transparence is improved; the color of a polymer product is greatly improved; and the processing is easily carried out; the polymerizing degree is greatly increased; the thermal stability of a carbodiimide composition is improved; and the content of carbodiimide group is correspondingly increased, so that the hydrolysis resistance is improved, and moreover, the ageing resistance is correspondingly improved.

The invention discloses a switch cabinet finish. The switch cabinet finish is prepared by using the following raw materials, by weight, 40-45 parts of alkyd resin, 32-37 parts of E-44 epoxy resin, 4-5 parts of bentonite, 12-14 parts of xylene, 3-3 parts of polytetrafluoroethylene, 1-2 parts of an aluminate coupling agent DL-411, 4-5 parts of ferrocene, 2-3 parts of bistetradecyl ester, 5-7 parts of propylene glycol, 2-3 parts of sulfenyl isooctyl acetate, 3-4 parts of polyvinyl butyral, 20-30 parts of xylenediamine trimer, 12-15 parts of ethyl acetate, 2-3 parts of 3-aminopropyltriethoxysilane, 1-2 parts of zinc stearate and 3-4 parts of a dispersion aid. The dispersion assistant improves the optical performance, makes the finish uniformly dispersed and maintains the stability of the finish; a film formed by using the finish has the advantages of good fullness, high luster, high hardness, good adhesion, excellent mechanical performances, weatherability, wear resistance, and good acid, alkali, alcohol and gasoline resistance.

The invention provides a method for preparing an AZO film. The method is characterized by comprising the following steps: (1) carrying out magnetron sputtering: in direct-current magnetron sputtering equipment, by adopting an Al2O3 doped ZnO ceramic target as a cathode sputtering target and adopting argon gas as working gas, enabling argon gas to bombard the cathode sputtering target at the working gas pressure of 10<-2> to 10<-1>Pa, carrying out pre-sputtering for 8-10 minutes, taking a quartz substrate as an anode after the process of pre-sputtering is ended, enabling the quartz substrate to automatically rotate at the rate of 3-6r/min, enabling argon gas to bombard the cathode sputtering target, and carrying out magnetron sputtering for 8 minutes, so as to deposit an AZO film on the quartz substrate; (2) etching a grating microstructure: coating the surface of the AZO film with a layer of photoresist, covering the surface of the photoresist with a grating mask plate, exposing the photoresist, developing the photoresist with a developing solution, and forming grating grooves in the surface of the AZO film through etching by adopting an argon ion beam etching technology.

The invention relates to a hot bending glass graded forming die which comprises a preforming frame, a forming frame and a control module for controlling the preforming frame to move up and down. The preforming frame comprises a plurality of first arc-shaped fixing frames and a pair of movable preforming shelves connected to the two ends of the first fixing frame in a pivoted mode. The forming frame comprises a plurality of second arc-shaped fixing frames and forming shelves arranged at the two ends of the second arc-shaped fixing frames. Gaps are formed between the first arc-shaped fixing frames and the second arc-shaped fixing frames, and the first arc-shaped fixing frames are staggered above the second arc-shaped fixing frames. Through the graded formation, the problem that glass generates fold lines due to stress oppression is solved, frills caused by too large local deformation of the glass resulting from one-time self weight forming of a conventional die are avoided, the optical distortion is greatly reduced, the optical property of a glass plate is improved, die hinge traces are eliminated, and the product appearance quality is improved.

The invention discloses a perovskite quantum dot and metal organic framework composite luminescent material as well as a preparation method and application thereof. The method comprises the following steps: mixing lead halide, cesium halide, an imidazole ligand and a central metal atom compound, and conducting grinding for 5-50 minutes to obtain the perovskite quantum dot and metal organic framework composite luminescent material, wherein the central metal atom compound is one or more of zinc oxide, cobalt hydroxide or zinc acetate. The perovskite quantum dot and metal organic framework composite luminescent material is synthesized in one step through mechanical grinding, and the problem that in the prior art, a surfactant needs to be used for reducing the size of perovskite is solved. The method disclosed by the invention is green and environment-friendly, and the optical performance of the composite material is also improved while the stability of the perovskite quantum dots is improved.

The invention discloses an image obtaining system based on a lens with two integrated segments and a camera body with a single offset sensor. The image obtaining system comprises the camera body (1) and the lens (2), wherein the front panel of the camera body is equipped with a circular opening which is used as a lens interface, and the integrated lens is in butt joint with the circular opening; the image sensor (13) is arranged in the camera body (1) and deviated from the axis of the circular opening; the integrated lens (2) of a two-segment structure is composed of the front segment (22) and the rear segment (21); the rear segment is clamped or fixed with the circular opening of the camera body; the front segment can coaxially rotate relative to the rear segment to switch sub lenses; and the camera body is equipped with a display screen. The image obtaining system based on the lens with the two integrated segments and the camera body with the single offset sensor is high in integrated level, and convenient to use; and can combine the excellent optical performance of multiple prime lenses with the portability of the structure consisting of one camera body and one lens.

The invention provides a preparation method of amorphous boron-doped graphite phase carbon nitride quantum dots, and belongs to the field of fluorescent materials. The method includes the following steps: (1) taking citric acid as a carbon source, boric acid as a boron source and urea as a nitrogen source, adding a proper amount of deionized water, and uniformly grinding the components to obtain a mixture; (2) putting the mixture into a high-pressure reaction kettle, heating the reaction kettle to 180 DEG C, and reacting for 1.5-2.5 hours; (3) naturally cooling the product to normal temperature to obtain a reaction solution, mixing the reaction solution with deionized water, and carrying out ultrasonic treatment; (4) filtering the solution obtained in the step (3) through a filter membrane, and collecting supernate; and (5) diluting the supernate, so as to obtain the amorphous B-CNQDs suspension. The invention also provides the amorphous boron-doped graphite phase carbon nitride quantum dot prepared by the method and application of the amorphous boron-doped graphite phase carbon nitride quantum dot in fluorescence imaging and heavy metal ion detection. The amorphous B-CNQDs have the advantages of high fluorescence quantum yield, no excitation wavelength dependence, strong fluorescence stability, and very high selectivity and sensitivity to Fe < 2 + > and Cd < 2 + > in a trace (ppb) range.

The invention relates to an antibacterial high-temperature-aging-resistant polyimide film and a preparation method thereof. The method comprises the following steps: (1) adding diamine and a solvent,then adding dianhydride and an antibacterial functional monomer, and carrying out reaction for 10-24h so as to obtain polyamide acid containing the antibacterial functional monomer; (2) activating SiO2 at 250-280 DEG C under the reflux of anhydrous toluene, and then, carrying out surface treatment by using perfluorooctyl triethoxysilane; (3) adding maleic anhydride and SiO2 subjected to the surface treatment into polyamide acid, performing stirring for 2-3 hours, and performing gradient heating and thermal imidization to obtain polyimide; (4) adding nano TiO2 into a polyvinyl alcohol colloidalsolution with a concentration of 10%, and performing uniform stirring; (5) uniformly mixing a product obtained in the step (3) and a mixture obtained in the step (4), and performing granulating; and(6) performing film blowing to form the polyimide film. According to the invention, the SiO2, the TiO2 and the antibacterial functional monomers are added into the polyimide, so that the obtained polyimide film has excellent high temperature aging resistance and long-acting antibacterial property, and is suitable for food packaging under African hot weather conditions.

The invention relates to C08F, in particular to a cycloolefin copolymer with polar groups and a preparation method of the cycloolefin copolymer. Structural units of the cycloolefin copolymer comprise a vinyl unit A, a non-polar unit B and a polar unit. According to the cycloolefin copolymer provided by the invention, the polar cyclic unit is introduced, so that the compatibility and cohesiveness of the material in the use process can be promoted, and meanwhile, the structure of the non-polar unit and the polar unit can be controlled, so that the cycloolefin copolymer has high light transmission and provides high optical performance under different vinyl chain unit copolymers. By adjusting the use amount of a polar unit and a non-polar unit relative to a vinyl unit, the inventor finds that the polar copolymer is controlled to have a wide-range adjustable glass transition temperature, the formation of an amorphous structure can be promoted, the generation of a crystalline chain segment is avoided, and the improvement of optical characteristics is further promoted; the copolymer application range is expanded.