36results about How to "Slow volatilization" patented technology

The invention provides a catalyst layer structure capable of effectively reducing fuel cell platinum (Pt) loading capacity. A catalyst layer is composed of a plurality of layers of single catalyst layers in different ingredients, and catalyst Pt loading capacity, ion conductor type, Pt loading capacity and a preparation process of each layer are different, so that the purposes of improving catalyst utilization rate and reducing the Pt loading capacity can be realized. In the reaction time of fuel cells, oxygen molecules diffuse from the catalyst layers to the interiors of the catalyst layers, and react with hydrogen protons moved from anodes. According to characteristics of the reaction of the fuel cells, oxygen diffuses from diffusion layers to the interiors of the catalyst layers and reacts with the hydrogen protons transmitted from the anodes to produce water. In the design of the catalyst layer structure, the Pt concentration and the ion conductor concentration of a catalyst layer close to the membrane side are improved in an emphasis mode so that reaction efficiency under intermediate and low current density is improved.

The invention provides a sort of ink manufactured by raw materials with the following mass percent: 10-15 percent of butadiene acrylonitrile rubber, 9-15 percent of neoprene, 5-10 percent of acetone, 5-10 percent of toluene, 10-15 percent of glycol butyl et her, 9-15 percent of linseed oil, 5-11 percent of silicon oil, 1-5 percent of titanate coupling agent, 10-25 percent of pigment, 1-4 percent of polyethylene wax, and 0.5-3 percent of aluminum stearate; the ink of the invention is mainly applicable to printing of various plastic material carriers and is provided with high adhesive attraction and good adhesive effect. In the applying facet, superficial treatment is not needed to be carried out to the plastic material carrier when used; printing can be carried out directly, thus guaranteeing good printing effect.

The invention discloses a functional traditional Chinese medicine sachet and a preparation method thereof, and relates to the technical field of traditional Chinese medicine sachets. The functional traditional Chinese medicine sachet comprises the following traditional Chinese medicines in parts by weight: rhizoma atractylodis, agastache rugosus, fructus evodiae, folium artemisiae argyi, cinnamon,fructus amomi, acorus calamus, radix angelicae, eupatorium, mint, clove, white chrysanthemum, tuber fleeceflower stem, albizia flower, juncus effuses, white sandalwood, borneol, flos magnoliae, ligusticum wallichii, schizonepeta, cassia twig, eupatorium, purple perilla and asarum. The traditional Chinese medicine sachet provided by the invention has the following advantages: volatile components of the traditional Chinese medicines are emitted in air and absorbed into the body through the respiratory tract and the skin to generate medicine effects; screened medicine powder is subpackaged and uniformly mixed according to different proportions to be divided into a small sachet A, a small sachet B and a small sachet C; the small sachet A, the small sachet B and the small sachet C are then loaded into a sachet together; and the effects of exorcising evil spirits, repelling mosquitoes, concentrating mind, calming qi, clearing heat and removing toxicity are achieved.

The invention relates to a kind of high-speed carbon ribbon ink coating material and its preparation, including: 30-50% of binder, 10-16% of security phosphor, 40-60% of toluene. Its preparation include the following steps: Firstly, it mixes 50% of petroleum resin, 50% of wax, and heats the mixture at 85 degree in the atmospheric environment for 2 hours to produce binder. Secondly, it mixes 30-50% of binder, 10-16% of phosphor powder, and 40-60% of toluene in high-speed dispersion machine for 1 hour to achieve carbon ribbon ink. Thirdly, it coats the carbon ribbon ink on the PET film by using thermal coating machine to achieve the carbon ribbon.

The invention discloses a manufacturing method for an Nb3Al superconducting wire. The manufacturing method comprises the steps of: melting and uniformly mixing Nb and Al1-x Nbx intermediate alloy; slowly cooling the mixture and quenching the mixture to generate Nb(Al)ss supersaturated sosoloid; processing the sosoloid to form powder, and filling the powder into a Cu tube, and processing the powder to form a Cu / Nb-Al wire; and finally carrying out thermal treatment on the formed Cu / Nb-Al wire. According to the manufacturing method disclosed by the invention, a normal powder in tube processes the Nb(Al)ss supersaturated sosoloid powder to be a guide wire, and phase-forming thermal treatment is conducted on the guide wire to obtain a high-performance Nb3Al superconducting wire. The manufacturing method disclosed by the invention is simple, and a complicated thermal treatment device is not needed, so that a difficulty that the wire is frequently broken in a common method is solved; and moreover, according to the manufacturing method, the cost is low, the Nb3Al is suitable for industrial production and helpful for large-scale popularization.

The invention relates to the technical field of fertilizer, in particular to efficient environment-friendly inorganic fertilizer based on biomass charcoal and a production process thereof. The production process includes the following steps that 1, the biomass charcoal and phosphoric acid are mixed to obtain a mixed solution; 2, ammonia gas is introduced into the mixed solution to obtain a reaction solution; 3, carbon dioxide is introduced into the reaction solution to react, and the efficient environment-friendly inorganic fertilizer is prepared through drying. The efficient environment-friendly inorganic fertilizer based on the biomass charcoal is prepared through the production process. The efficient environment-friendly inorganic fertilizer has slow-release and long-acting functions, ammonia gas volatilization speed is low, nitrate leaching loss is small, the inorganic fertilizer can be efficiently absorbed by plants, and the nitrogen use ratio is high.

The invention relates to a bird repellent ointment. The bird repellent ointment is prepared from components in percentage by weight as follows: 8%-35% of garlicin, 6%-20% of peppermint essential oil,5%-15% of Artemisia absinthium essential oil, 6%-25% of ethyl alcohol, 5%-15% of a binder and 30%-65% of paraffin. The garlicin, the peppermint essential oil, the Artemisia absinthium essential oil and ethyl alcohol are mixed and stirred under the action of ultrasonic waves, then the binder and the paraffin are added sequentially, and the bird repellent ointment is prepared by stirring. The bird repellent ointment containing the binder and the paraffin volatilizes slowly, and has long in bird repellent time and stable bird repellent effect; the bird repellent ointment containing the garlicin,the peppermint essential oil and the Artemisia absinthium essential oil can repel birds effectively, does not produce irreversible continuous harm to the birds and is convenient to use, and a preparation method is simple.

The invention provides a method for repairing an automobile hub scratch and relates to the technical field of automobiles. The method for repairing the automobile hub scratch includes the following steps of (1) hub scratch pre-treatment, (2) blending agent blade coating, (3) refinishing paint spraying, (4) varnish spraying and (5) polishing. By the adoption of the method for repairing the automobile hub scratch, the hub scratch position is repaired, the whole repairing process is simple and easy to achieve, an action effect is remarkable, repairing used time is short, work efficiency is improved, and the effect that time and labor are saved is achieved.

The invention provides a repair method for car paint, and relates to the technical field of cars. The repair method for the car paint comprises the following steps of (1) pretreatment of damaged partsof the car paint, (2) spraying of a painting make-up agent, (3) spraying of colored paint, (4) spraying of varnish and (5) grinding and polishing. The repair method for the car paint repairs the damaged parts of the car paint, the whole repair process is simple and easy to realize, the effect is obvious, time for painting make-up is short, the working efficiency is improved, and the time-saving and labor-saving effect is achieved.

The invention discloses a novel efficient working solution for a cutting machine. The efficient working solution comprises the following components in percentage by weight: 15%-30% of base oil, 25%-35% of deionized water, 8%-10% of higher aliphatic alcohol, 8%-12% of polyether, 3%-7% of a surfactant, 2%-6% of a blasting agent, 1%-3% of a preservative, 2%-5% of a rust inhibitor, 3%-5% of a solubilizer, 1.5-2% of an anti-mildew bactericide and 3%-5% of an extreme pressure additive. The novel efficient working solution has the advantages that 1) the processability is good, and a work-piece of which the maximal thickness is 1200nm can be processed; 2) the surface smoothness is good, and the efficiency is improved by 20% in comparison with a water-based working solution when hard metal materials such as chromium are processed; 3) the novel efficient working solution accords with the environmental protection requirements, does not contain toxic and harmful substances, and does not generate lampblack in the processing process; and 4) the evaporation speed is low; the phenomena of corrosion and rust deposition are not generated on a work bench after long-time use.

The invention discloses a method for accelerating complexing and aging of wine. The method comprises the following steps of: (1) carrying out high-frequency oscillation on new wine liquid so as to enable the new wine liquid to be dissociated into small molecular groups in a monomolecular or associated state; (2) filtering the wine liquid after high-frequency oscillation by adopting minerals, and enabling metal ions in the minerals to be dissolved into the wine liquid; (3) performing mixing on the wine liquid into which plenty of the metal ions are dissolved, and enabling sol complex adopting the metal ions as colloidal nucleus to be formed in the wine liquid; (4) irradiating the wine liquid with the colloidal complex by adopting ultraviolet light with the wavelength being 100-400nm, enabling the wine liquid to be stable, and obtaining the aged wine liquid. The invention also discloses a device for accelerating complexing and aging of the wine by adopting the method. The method and the device provided by the invention have the advantages that large number of storage containers are not needed, the aging and alcoholizing time is shortened, simultaneously the impurity removing effect is obvious, the richness of the metal ions is greatly improved compared with that of the traditional method, the wine body is stable and the taste and the physical and chemical indexes are better.

The invention discloses water-soluble tea tree oil and a method for preparing the same. The water-soluble tea tree oil comprises from 5.00 to 50.00 parts of tea tree oil, from 1.40 to 6.50 parts of emulsifiers, from 0.05 to 0.20 part of antibacterial agents, from 0.01 to 0.05 part of antifoaming agents, from 0.01 to 0.15 part of essence and from 43.0 to 90.0 parts of water. The method includes (1), adding the emulsifiers, the antibacterial agents and the defoaming agents into the tea tree oil, heating the tea tree oil with the emulsifiers, the antibacterial agents and the defoaming agents until the temperature of the tea tree oil reaches an emulsification temperature, and uniformly stirring the tea tree oil to obtain a mixture; and (2), dissolving the essence in the water, heating the water with the essence so that the temperature of the water reaches an emulsification temperature, slowly adding the water with the essence into the mixture, and uniformly stirring the water and the mixture to obtain the water-soluble tea tree oil. The water-soluble tea tree oil and the method have the advantages that operation is simple, the production cost is low, and the prepared water-soluble tea tree oil is low in volatilization speed, high in efficacy, free of layering, skinning, oil slick and pollution and good in flowability and diffusion performance, is non-toxic, nonflammable, non-explosive, safe, stable and environment-friendly, and can be dissolved in water solution.

The invention discloses an aqueous cleaning agent. The aqueous cleaning agent is prepared from 2-3 parts by weight of dodecyl dimethyl betaine, 2-3 parts by weight of sodium dodecyl sulfate, 2-3 parts by weight of essence and 30-40 parts by weight of deionized water. The aqueous cleaning agent mainly comprises an activator and a penetrant, permeates into a stain and / or residual glue part to be removed and activates stain and / or residual glue characteristics so that stain and residual glue removal is realized. The aqueous cleaning agent can be efficiently used for removing stain and glue on metal, glass and ceramic surfaces and has the advantages of static resistance, low volatilization speed and use convenience.

The invention relates to the technical field of fertilizer, in particular to an efficient environment-friendly nitrogen fertilizer based on biomass charcoal and a production process thereof. The efficient environment-friendly nitrogen fertilizer is prepared from, by weight, 100 parts of urea, 1-5 parts of biomass charcoal, 0.1-0.5 part of phosphoric acid, 1-5 parts of dicyandiamide and 0.5-1.5 parts of starch gel. The efficient environment-friendly nitrogen fertilizer has a slow release function and is long-acting, ammonia gas volatilization speed is low, leaching loss of nitrate is small, the nitrogen fertilizer can be efficiently absorbed by plants, and the nitrogen use ratio is large.

The invention discloses a novel detergent for printing ink. The novel detergent for printing ink is characterized by being prepared from the following raw materials in parts by weight: 30-34 pars of kerosene, 10-12 parts of acetone, 4-6 parts of ethyl acetate, 3-5 parts of tween 20, 1-2 parts of pine tar, 1-2 parts of cyanuric acid zinc, 1-2 parts of lignosulfonate, 1-2 parts of 2,6-Di-tert-butyl-4-methylphenol, 5-7 parts of glycolic acid, 10-12 parts of nitroethane, 4-5 parts of an addition agent, and 100-110 parts of water. Due to the addition of the addition agent, the processing property of the detergent is improved, and toxic and side effects and contamination to environment are reduced; the novel detergent for printing ink has strong cleaning capacity, has no toxicity, is unharmful to human bodies, has no corrosivity, is low in production cost, has small use level compared with pure solvent type detergents such as kerosene and gasoline, has low volatilization speed, can fully exert the cleaning effect and greatly saves the use level.

The invention relates to the field of health-care medicine essence, and discloses a Tibetan-medicine medicine essence with effects of soothing nerves and cultivating nature and a preparation method. The Tibetan-medicine medicine essence is technically characterized by being prepared from the following raw materials of stigma croci, frankincense, flos caraganae franchetianae, herba artemisiae apiaceae, rhizoma nerdostachyos, sappanwood, black Chinese angelica root, white Chinese angelica root and modified plant sticky powder. The preparation method comprises the following steps of firstly, cleaning the raw materials, drying the raw materials in a shady area, crushing the raw materials into powder by a crushing machine, mixing the raw materials, and uniformly mixing, so as to obtain the mixed medicine powder; coating the mixed medicine powder, putting into wine, soaking, mixing the soaked mixed medicine powder and the modified plant sticky powder in parts by weight, and forming by a mold. The Tibetan-medicine medicine essence has the advantages that the components are changed on the basis of the existing southern Tibetan-medicine medicine essence, the protected animal, namely pangolin, is not used, and the functions are mutually coordinated on the basis of medicine property of noble herbal medicines.

The invention discloses a volatilizing-preventing gluing box for patches of elastic bodies and belongs to the technical field of design of mechanical devices. The gluing box comprises a glue storage box, a transverse cover plate, a longitudinal cover plate, a base, a fixed seat, a transverse slide and a transverse sliding block; the glue storage box is a cubic structure with a square inner groove and is fixed on a workbench; the longitudinal cover plate is fixed on the base through a screw; the transverse cover plate is fixed on the transverse sliding block; the transverse slide is fixed on the fixed seat; the transverse sliding block is embedded in a track groove of the transverse slide and can move leftwards and rightwards on the transverse slide; and before the elastic bodies are glued, the transverse cover plate moves leftwards, a gluing brush moves to the upper side of the glue storage box and extends into the glue storage box to be dipped in glue, the transverse cover plate moves rightwards after the gluing brush leaves, the top of the glue storage box is covered, and the glue is prevented from volatilizing quickly. With the gluing box, the glue in the glue storage box volatilizes slowly, the gluing brush is dipped in the glue conveniently, and the moving resistance of the transverse sliding block relative to the transverse slide is low.

A method for improving the silicon dioxide optical property through surface crystallization comprises following steps: firstly, a silicon wafer is evenly coated with chemically-modified colloidal silica sol particles; secondly, the silicon wafer, coated with the silicon dioxide, in the first step is subject to high-pressure inert gas heat treatment in a furnace, the heat treatment temperature ranges from 100 DEG C to 1800 DEG C, the gas pressure ranges from 0.1 MPa to 6 MPa, the heat treatment time ranges from 1 h to 10 h, and a uniform silicon dioxide film layer with the particle surface partly crystallized is obtained. The optical property of the silicon dioxide film layer subject to high-pressure inert atmosphere rapid temperature increasing and decreasing heat treatment is improved, the refractive index is improved, and is continuously adjusted, the film layer can serve as an ideal material of a solar cell gradient refractive index antireflection layer, and the film layer is simple in preparing process, low in raw material cost and beneficial to large-scale industrial production.

The invention provides a sort of ink manufactured by raw materials with the following mass percent: 10-15 percent of butadiene acrylonitrile rubber, 9-15 percent of neoprene, 5-10 percent of acetone, 5-10 percent of toluene, 10-15 percent of glycol butyl et her, 9-15 percent of linseed oil, 5-11 percent of silicon oil, 1-5 percent of titanate coupling agent, 10-25 percent of pigment, 1-4 percent of polyethylene wax, and 0.5-3 percent of aluminum stearate; the ink of the invention is mainly applicable to printing of various plastic material carriers and is provided with high adhesive attraction and good adhesive effect. In the applying facet, superficial treatment is not needed to be carried out to the plastic material carrier when used; printing can be carried out directly, thus guaranteeing good printing effect.

The invention provides a catalyst layer structure capable of effectively reducing fuel cell platinum (Pt) loading capacity. A catalyst layer is composed of a plurality of layers of single catalyst layers in different ingredients, and catalyst Pt loading capacity, ion conductor type, Pt loading capacity and a preparation process of each layer are different, so that the purposes of improving catalyst utilization rate and reducing the Pt loading capacity can be realized. In the reaction time of fuel cells, oxygen molecules diffuse from the catalyst layers to the interiors of the catalyst layers, and react with hydrogen protons moved from anodes. According to characteristics of the reaction of the fuel cells, oxygen diffuses from diffusion layers to the interiors of the catalyst layers and reacts with the hydrogen protons transmitted from the anodes to produce water. In the design of the catalyst layer structure, the Pt concentration and the ion conductor concentration of a catalyst layer close to the membrane side are improved in an emphasis mode so that reaction efficiency under intermediate and low current density is improved.

A paint remover for polyester and polyesterimide enamelled copper round wire paint film, including formic acid, chloroform, mixed cresol, and additives, the content percentage of each component is as follows: formic acid: 30%-50% , Chloroform: 30%-40%, mixed cresols: 5%-35%, additives: 0%-5%, add formic acid, mixed cresols and additives into chloroform, stir and mix evenly . The paint remover provided by the invention can remove the primer as polyester or non-weldable polyesterimide thermosetting self-adhesive enameled wire paint film in a very short period of time (for example, within 4MIN) at normal temperature, with good effect and high efficiency ,low cost.

The invention provides a preparation method of oily solid powder essence, and belongs to the field of solid powder essence preparation. The preparation method of the oily solid powder essence comprises the following steps: (1) dissolution; (2) swelling; (3) mixing; (4) high-speed stirring and dispersion; (5) high-pressure homogenization; (6) addition of a spray carrier; (7) spray drying; and (8) packaging. The oily solid powder essence prepared by the method has the following advantages: 1, the oily solid powder essence does not explode and catch fire when placed in a car, the safety factor ishigh, and the safety of perfume used in the car can be effectively guaranteed; 2, the oily solid powder essence has a slower volatilization speed than that of liquid perfume, and can continuously release fragrance for a long time; and 3, the oily solid powder essence produced by the patent method is nano-particle powder, the essence is uniformly supported, the properties are stable, and the fragrance emitted by the essence is uniform and not pungent.

The invention discloses a green insect-repelling preparation and a package thereof. In the green insect-repelling preparation, the mass ratio of anisole, fenchone, allicin, propylene sulfide, clove oil, anisaldehyde, camphor oil, alcohol and musk is (1-10):1:0.5:(1-2):5:(0.5-2):1:10:(0.5-2.5). a preparation method comprises the steps of 1, dispersing anisole, fenchone, allicin, propylene sulfide,clove oil, anisaldehyde and camphor oil evenly in alcohol having the concentration of 90-95% by weight; and 2, adding the mixture of the step 1 into musk, and dispersing evenly to obtain the green insect-repelling preparation. The package herein comprises a bottle body to hold the insect-repelling preparation, a bottlecap covering an opening of the bottle body, and a cotton cord having the bottomend soaked in the insect-repelling preparation and the top end which may penetrate the opening. The insect-repelling preparation has long acting time can repel insects over large areas.

The invention provides a single-component polyurethane foam joint mixture and a preparation method thereof, and is characterized in that the single-component polyurethane foam joint mixture comprises the following raw material components: 7-11 parts of mixed polyether, 2-4 parts of a foam stabilizer, 36-42 parts of seed wrapping wax, 1-3 parts of a catalyst, 1.5-4.5 parts of a bactericide, 2-4 parts of an insecticide, 1.5-4.5 parts of a rooting agent, 19-23 parts of polymerized MDI, and 20-24 parts of a propellant. The invention has the advantages that: 1, the product adopts a sterilization insecticide, so that corresponding agricultural crop plants are prevented from being damaged by bacteria, mildewing and diseases and pests; 2, the rooting agent is added, so that plant root growth is promoted, plants can absorb nutrients, and healthy and strong growth of the plants is promoted; 3, the slow-rebound polyether polyol and the delayed catalyst have a synergistic effect, a propellant with a slow volatilization speed is preferably selected, and the post-foaming effect is obvious; and 4, the seeds are coated with paraffin, thereby being environment-friendly, non-toxic and beneficial to improving the fertilizer utilization rate. The invention also discloses a preparation method of the single-component polyurethane foam joint mixture.

The invention discloses a coating method capable of reducing surface chalking of a plastic part. The method comprises the following steps: (1) uniformly mixing and continuously stirring epoxy resin and acetone until epoxy resin is totally dissolved, adding an organosilicone oligomer containing double-hydroxyl functional groups to the mixture, heating the mixture, continuing to add an initiator tothe mixture, and performing insulation treatment to prepare a copolymer emulsion; (2) uniformly mixing the copolymer emulsion, isopropoxyboronic acid pinacol ester and octabromobisphenol-S to preparea coating for the plastic part; (3) removing dirt and oil from the surface of the plastic part, then uniformly brushing the coating for the plastic part to the surface of the plastic part, placing theplastic part in a drying oven for drying to prepare a finished product. The surface of the prepared plastic part has excellent wear resistance, high-temperature resistance and corrosion resistance and is not prone to chalking after coating, and the quality of the plastic part is improved greatly.

The invention relates to a tire tread color line ruling device which is used for a tire tread extrusion line and is composed of a rubber cement box, a rubber cement tube communicated with the rubber cement box and a ruling needle cooperated on the end part of the rubber cement tube, wherein the rubber cement tube is provided with a stop valve for controlling the rubber cement to circulate. The tire tread color line ruling device is characterized in that the rubber cement tube is provided with a flow control valve, and the ruling needle adopts an air needle of which the internal diameter is 1mm. The tire tread color line ruling device can be used for conveniently controlling the flow and easily regulating the color line width. The thicknesses of the tire tread color lines are even, the tire tread percent of pass is improved, and the pipeline of the ruling needle has small possibility of being blocked. The tire tread color line ruling device is convenient to operate, is smooth to rule and has the advantages of high ruling quality and small rubber cement use amount.

The invention discloses water-soluble tea tree oil and a method for preparing the same. The water-soluble tea tree oil comprises from 5.00 to 50.00 parts of tea tree oil, from 1.40 to 6.50 parts of emulsifiers, from 0.05 to 0.20 part of antibacterial agents, from 0.01 to 0.05 part of antifoaming agents, from 0.01 to 0.15 part of essence and from 43.0 to 90.0 parts of water. The method includes (1), adding the emulsifiers, the antibacterial agents and the defoaming agents into the tea tree oil, heating the tea tree oil with the emulsifiers, the antibacterial agents and the defoaming agents until the temperature of the tea tree oil reaches an emulsification temperature, and uniformly stirring the tea tree oil to obtain a mixture; and (2), dissolving the essence in the water, heating the water with the essence so that the temperature of the water reaches an emulsification temperature, slowly adding the water with the essence into the mixture, and uniformly stirring the water and the mixture to obtain the water-soluble tea tree oil. The water-soluble tea tree oil and the method have the advantages that operation is simple, the production cost is low, and the prepared water-soluble tea tree oil is low in volatilization speed, high in efficacy, free of layering, skinning, oil slick and pollution and good in flowability and diffusion performance, is non-toxic, nonflammable, non-explosive, safe, stable and environment-friendly, and can be dissolved in water solution.

The invention discloses a clean laboratory sterilization pad, and belongs to the field of sterilizing devices. The clean laboratory sterilization pad is mainly composed of a liquid storage part located on the lower side of the whole device and a liquid seepage part located on the upper side. A disinfectant is conveyed from the liquid storage part to the liquid seepage part through a liquid absorption material, and the disinfectant is slowly released to the sole through a filler in the liquid seepage part. Due to the design, the defects that the contact surface between the disinfectant and air is large, the disinfectant is easy to volatilize, the disinfectant needs to be frequently sprayed and supplemented, and when the disinfectant is sprayed, a large amount of disinfectant can be sprayed into the air except the disinfectant sprayed to the 'disinfection device', so that the disinfectant is wasted are overcome. The clean laboratory sterilization pad has the advantages that disinfectant can be stored, the liquid seepage part playing a role in disinfection is separated from the liquid storage part playing a role in storing the disinfectant, and the surface, making contact with a shoe sole, of the clean laboratory sterilization pad can 'retain' the disinfectant for a long time.

A method for improving the silicon dioxide optical property through surface crystallization comprises following steps: firstly, a silicon wafer is evenly coated with chemically-modified colloidal silica sol particles; secondly, the silicon wafer, coated with the silicon dioxide, in the first step is subject to high-pressure inert gas heat treatment in a furnace, the heat treatment temperature ranges from 100 DEG C to 1800 DEG C, the gas pressure ranges from 0.1 MPa to 6 MPa, the heat treatment time ranges from 1 h to 10 h, and a uniform silicon dioxide film layer with the particle surface partly crystallized is obtained. The optical property of the silicon dioxide film layer subject to high-pressure inert atmosphere rapid temperature increasing and decreasing heat treatment is improved, the refractive index is improved, and is continuously adjusted, the film layer can serve as an ideal material of a solar cell gradient refractive index antireflection layer, and the film layer is simple in preparing process, low in raw material cost and beneficial to large-scale industrial production.