38results about How to "Retain good properties" patented technology

The invention discloses a method for preparing spheroidal graphene, and a technical problem to be solved is to increase the density of graphene and make the transportation and storage convenient. The method comprises the following steps: dispersing graphene in water or alcohol, carrying out ultrasonic processing or ball milling, and carrying out granulation and drying to obtain the spheroidal graphene; or dispersing graphene in water with stirring, carrying out decentralized processing, and carrying out granulation and drying to obtain the spheroidal graphene. Compared with the prior art, by high temperature granulation or low temperature refrigeration granulation processing, the obtained graphene has uniform structure, small volume, large density, good electrical conductivity, and convenience in transportation, and can be applied in catalyst carrier, drug delivery, lithium ion battery and super capacitor as a carbosphere; by ultrasonic processing, the spheroidal graphene is dispersedinto graphene monomers with less than 10 layers, and the excellent properties of the graphene are kept, the obtained spheroidal graphene can be convenient for being applied in various fields, the safety performance is high, the continuous preparation production can be realized, the processing capacity can be controllable and adjustable, and the invention is suitable for large scale production.

The invention discloses an apple stock MM116 tissue culture rapid propagation method. The method comprises the steps as follows: firstly, conducting primary culture through adopting a culture medium containing MS+6-BA 0.5 mg / L+IBA 0.1 mg+PVP 500mg / L; secondly, conducting subculture by using MS+6-BA 0.6 mg / L+IBA 0.1 mg / L; thirdly, adopting a rooting culture medium of 1 / 2 MS+IBA 0.9 mg / L for rooting culture; fourthly, adopting pure saw dust for acclimatization and transplant. Through the method, the apple stock MM116 tissue culture rapid propagation is realized, a higher survival rate is guaranteed, the excellent characteristics of a stock is maintained, and a convenient method and approach are brought to the development and further expansion of the apple industry.

The invention discloses a rapid reproduction method for apple rootstocks T337. The method is used for rapidly reproducing the apple rootstocks T337 by virtue of primary culturing with a culture medium consisting of MS, 0.5mg / L of 6-BA, 0.1 milligram of IBA and 500mg / L of PVP, secondary culturing with MS (0.75mg / L of NH<4+> and 2.2mg / L of K<+>), 0.6mg / L of 6-BA and 0.5mg / L of IBA, rooting culturing with a rooting culture medium comprising 1 / 2MS and 0.9mg / L of IBA and acclimatization and transplantation with pure sawdust. According to the method, high survival rate is ensured, high properties of the rootstocks are also preserved, and a convenient method and convenient means are provided for the development and further expansion of the apple industry.

The invention relates to the field of macromolecules, and particularly relates to a micro-foaming polypropylene material and a preparation method thereof. The invention provides the micro-foaming polypropylene material with low density and high foaming rate and the preparation method thereof, wherein pores have uniform pore diameters and are mainly centralized in the material, no marks are formedon the surface and appearance is excellent. The preparation method comprises the following steps: preparing foaming agent composite powder with a particle size distribution D50 value of 1-10 microns through matrix particles and a composite foaming agent, uniformly loading the foaming agent on the matrix particles, carrying out mixing and extruding granulation on the foaming agent composite powderwith polypropylene resin, and carrying out injection molding to obtain the micro-foaming polypropylene material. Compared with a conventional micro-foaming mode, the method provided by the invention has lower cost and fewer requirements on special equipment, and excellent characteristics of pure polypropylene can be retained to the largest extent.

The invention discloses a back-hydrofoil high-speed wing rowboat, which comprises a boat body and a motive power device, wherein the bottom of the back end of the boat body is in an integral step lifting in a step shape, the bottom linetype of a front boat body is backwards and gradually transited to the shallow V-shaped transverse cross section from the V-shaped transverse cross section of a boat bow part, and then, the bottom linetype of a back boat body is in a horizontal or shallow reverse V-shaped or shallow reverse circular arc-shaped transverse cross section until the bottom linetype of the bow part of the back boat body is in a horizontal or shallow V-shaped transverse cross section. A back hydrofoil is arranged under the bottom of the back boat body, and two pairs of sheet bodies with tapered wing-shaped transverse cross section in horizontal staggered and transverse symmetry in the longitudinal direction respectively and obliquely extend from two sides of the front boat body. The back-hydrofoil high-speed wing rowboat has the advantages that the splashing kinetic energy of the sliding surface fluid can be better absorbed, and the comprehensive performance of the rowboat is better than that of a planing boat and a gliding-hydrofoil boat. The rapidity of the rowboat is improved by more than 10 percent than that of the planing boat, meanwhile, the transverse and longitudinal stability of the rowboat is greatly improved than that of the planing boat and the ordinary gliding-hydrofoil, and in addition, good character that the planing boat can surf the beach is reserved.

The invention belongs to the technical field of culturing of apple seedlings, and discloses a rapid propagation method of apple stock B9. The rapid propagation of the apple stocks can be realized by adding three-fifths field soil and upper part two-fifths vermiculite acclimating and transplanting through primary culture adopting the culture medium MS+6-BA0.6mg / L+IBA0.1mg / L+PVP600mg / L, subculture treated by MS+6-BA0.8mg / L+IBA0.1mg / L, and rooting culture adopting 1 / 2MS+IBA1.4mg / L+melatonin 0.01mg / L, not only can higher survival rate be guaranteed, but also the excellent property of the stocks can be kept, and convenient and fast method and approach can be provided for developing and further expanding apple industry; and the invention provides a rapid propagation method for culturing apple seedlings in China, so as to quicken the large-scale upgrading of apple in China.

The invention relates to a treatment process of high-salinity wastewater, and belongs to the technical field of wastewater. The treatment process of the high-salinity wastewater comprises the following steps: S1, recovering oil in extraction wastewater by adopting an oil removal method of adsorption resin adsorption, and conducting filtering to obtain oil-removed wastewater; and S2, adding metal ion exchange resin into the oil-removed wastewater to remove heavy metals. Metal ion exchange resin is used for adsorbing heavy metals, resource recycling of heavy metal ions and ammonium sulfate is performed after adsorption treatment, and evaporated water after wastewater treatment can be returned to each water use process for use, so that high-salinity wastewater can be subjected to resource utilization and harmless treatment, a large amount of water resources can be saved, moreover, the resource utilization of the wastewater is a new benefit growth point, and the method has important significance in realizing water conservation and emission reduction.

The invention discloses a method for preparing spheroidal graphene, and a technical problem to be solved is to increase the density of graphene and make the transportation and storage convenient. The method comprises the following steps: dispersing graphene in water or alcohol, carrying out ultrasonic processing or ball milling, and carrying out granulation and drying to obtain the spheroidal graphene; or dispersing graphene in water with stirring, carrying out decentralized processing, and carrying out granulation and drying to obtain the spheroidal graphene. Compared with the prior art, by high temperature granulation or low temperature refrigeration granulation processing, the obtained graphene has uniform structure, small volume, large density, good electrical conductivity, and convenience in transportation, and can be applied in catalyst carrier, drug delivery, lithium ion battery and super capacitor as a carbosphere; by ultrasonic processing, the spheroidal graphene is dispersedinto graphene monomers with less than 10 layers, and the excellent properties of the graphene are kept, the obtained spheroidal graphene can be convenient for being applied in various fields, the safety performance is high, the continuous preparation production can be realized, the processing capacity can be controllable and adjustable, and the invention is suitable for large scale production.

The invention discloses a hydrogen fluoride adsorbent, which comprises the following raw materials: polyacrylonitrile, and one or more of alkali metal fluoride, alkaline earth metal fluoride and alkali metal fluorine-hydrogen compound. The invention also discloses a preparation method and application of the hydrogen fluoride adsorbent. The treatment mode of hydrogen fluoride in the lithium hexafluorophosphate production process is improved through the novel adsorbent, hydrogen fluoride in waste gas is recycled as much as possible and used for upstream section production, energy is saved, cost is reduced, and benefits are improved.

The invention belongs to the technical field of apple seedling cultivation, and discloses a method for rapid propagation of apple rootstock SH38, by adopting a culture medium of MS+6-BA0.6mg / L+IBA0.1mg / L+PVP 500mg / L for primary culture , Subculture with MS+6‑BA 0.6mg / L+IBA 0.1mg / L, root culture with rooting medium 1 / 2MS+IBA1.2mg / L+melatonin 0.03mg / L, and then pure Sawdust hardening and transplanting; realized the rapid propagation of apple rootstock, not only ensured a high survival rate, but also retained the excellent characteristics of the rootstock, providing a convenient method and approach for the development and further expansion of the apple industry. The invention establishes a method for rapid propagation of apple rootstock SH38, which is of great significance for producing high-quality dwarf virus-free seedlings and has broad market prospects.

The invention relates to a preparation method for an ultraviolet-proof dyeing cloth and belongs to the field of bast fiber fabric after-treatment. The technological process is as follows: singeing, enzyme cooling reactor, low-temperature enzyme oxygen bleaching, steam whitening, ultraviolet-proof waterproof treatment, baking, air soft finishing and shrink-proof treatment. For solving the technical problems in development of ultraviolet-proof waterproof bleaching fiber dyeing cloth, the invention strives to make technological breakthrough at the aspects of fabric pretreatment, ultraviolet-proof treatment, water-proof agent, bleaching color fastness, and the like, settles the contradiction between thread count and ultraviolet-proof effect of summer clothing material and the contradiction between ultraviolet-proof treatment and waterproof settlement, solves the problem of bleaching color fastness and the problem of material wearing comfort, maintains the original excellent characteristics and overcomes the defects.

The invention discloses a back-hydrofoil high-speed wing rowboat, which comprises a boat body and a motive power device, wherein the bottom of the back end of the boat body is in an integral step lifting in a step shape, the bottom linetype of a front boat body is backwards and gradually transited to the shallow V-shaped transverse cross section from the V-shaped transverse cross section of a boat bow part, and then, the bottom linetype of a back boat body is in a horizontal or shallow reverse V-shaped or shallow reverse circular arc-shaped transverse cross section until the bottom linetype of the bow part of the back boat body is in a horizontal or shallow V-shaped transverse cross section. A back hydrofoil is arranged under the bottom of the back boat body, and two pairs of sheet bodies with tapered wing-shaped transverse cross section in horizontal staggered and transverse symmetry in the longitudinal direction respectively and obliquely extend from two sides of the front boat body. The back-hydrofoil high-speed wing rowboat has the advantages that the splashing kinetic energy of the sliding surface fluid can be better absorbed, and the comprehensive performance of the rowboat is better than that of a planing boat and a gliding-hydrofoil boat. The rapidity of the rowboat is improved by more than 10 percent than that of the planing boat, meanwhile, the transverse and longitudinal stability of the rowboat is greatly improved than that of the planing boat and the ordinary gliding-hydrofoil, and in addition, good character that the planing boat can surf the beach is reserved.

The invention relates to the technical field of navigation positioning and deep learning, and particularly discloses an improved derivative volume Kalman filtering integrated navigation method. The method comprises the following steps: establishing a state equation and a measurement equation according to a tight combination model, performing second-order Taylor expansion on pseudo-range measurement, and reducing measurement models caused by linear truncation. The SINS and GPS integrated navigation system is initialized; in the time updating process, CKF is made to filter in the same mode as KF, extra calculation caused by volume transformation of a state equation with linear characteristics is avoided, in the measurement updating process, a predicted value and a covariance thereof and a cross covariance between a state predicted value and a measurement value are calculated by adopting a volume point, the excellent characteristic of processing the nonlinear filtering problem through the CKF is ensured, and the redundant calculation problem of a tight combination system is solved. According to the method, the filtering precision of the system can be improved, the tracking capability of the filter on the system state is improved, the real-time performance of the system state is improved, and the robustness of the SINS / GPS integrated navigation system is enhanced.

The invention relates to a method for improving the antioxidant performance of raphanus sativus anthocyanins, and belongs to the technical field of anthocyanin performance modification. According to the method, by using raphanus sativus as a raw material and beta-glucosidase as a catalyst, after the steps of preparing raphanus sativus lyophilized powder, preparing a raphanus sativus anthocyanin crude extract, preparing a raphanus sativus anthocyanin solution, preparing beta-glucosidase lyophilized powder, and preparing hydrolyzed raphanus sativus anthocyanin lyophilized powder, the antioxidantperformance of the hydrolyzed raphanus sativus anthocyanin finally obtained is increased by 85.39 percentage points. The method is based on the principle of the antioxidant effect of the raphanus sativus anthocyanins, by hydrolyzing the glycosides and acylation groups which affect the antioxidant performance of the raphanus sativus anthocyanins by use of beta-glucosidase, the hydrolyzed raphanussativus anthocyanins are prepared, the reaction process conditions are mild, and the prepared hydrolyzed raphanus sativus anthocyanins retain the original excellent properties of the raphanus sativusanthocyanins; through determination of the total antioxidant performance, it is found that the total antioxidant performance of the raphanus sativus anthocyanins, through the method, is increased from25.18 U / mL to 46.68 U / mL, and the raphanus sativus anthocyanins can be widely used in food, medicine, cosmetics and other fields.

The invention relates to the technical field of pipeline conveying equipment, in particular to a functional steel pipe. The functional steel pipe comprises a pipe body, wherein the pipe body is formed by combining a stainless steel layer and a color master batch resin layer, the stainless steel layer is located on the inner layer of the pipe body, and the color master batch resin layer is located on the outer layer of the pipe body. The pipe body is designed to be of a combined structure of two kinds of materials, the stainless steel layer is located on the inner layer of the pipe body, the color master batch resin layer is located on the outer layer of the pipe body, the two kinds of materials complement each other, not only is the overall performance of the pipe body improved, but also the cost is saved, and the requirements for working environment are met.

The invention discloses a fig grafting cultivation method which solves the problems that in the prior art, fig trees are high and fruit picking is not easy. The method comprises the following steps that annual ficus hispida with the diameter of 0.5-0.8 cm serves as a stock; a strong annual semi-lignified branch collected from a fig mother tree serves as a scion; the stock and the scion are pruned, the pruned scion is rapidly inserted into a notch of the stock, and a scion forming layer is aligned with one side of the notch of the stock; a plastic film is used for sealing the joint and the upper end of the scion, and a bud eye of the scion is exposed when the plastic film is used for binding. The method has the advantages that the process is simple, operation is simple and convenient, the ficus hispida which is in the same family and genus as figs serves as the stock, the affinity is good, and the grafting survival rate is high. The excellent characteristics of the fig trees are maintained; meanwhile, tree bodies can be dwarfed, the yield of the figs is increased, picking is easy, economic benefits are improved, and the method is worthy of application and popularization.

The invention relates to the technical field of agriculture planting and in particular relates to a method for planting verbena in a desert area. The method comprises the following steps: digging verbena plants in the field, remaining main roots, cutting the main roots into sections, performing intermittent non-ionizing radiation induced treatment to generate high-temperature-resistant characteristics, transplanting the sectioned main roots into a root promoting medium for promoting rooting, coating the rooted main roots with a layer of coating medium, transplanting the roots into the desert for planting, and then manually watering thoroughly every 40-50 days to keep the moisture content of the coating medium at 80-85%. According to the method disclosed by the invention, the verbena is planted in the desert, so that the desert environment can be effectively improved. Moreover, with the adoption of the planting method disclosed by the invention, the planting survival rate of the verbena is 96% or higher, and due to desert planting, the content of verbenalin in the verbena can be effectively improved.

The invention discloses a manufacturing method of a polytetrafluoroethylene organic silicon pressure-sensitive adhesive tape. The manufacturing method comprises the following steps: 1) performing low-temperature and low-pressure plasma treatment on a polytetrafluoroethylene film; 2) coating the polytetrafluoroethylene base material subjected to plasma treatment with a primer; and (3) smearing an organic silicon pressure-sensitive adhesive on the surface of the polytetrafluoroethylene film coated with the primer, and conducting drying to obtain a final product. The preparation method is simple to operate and short in process, pollution can be effectively avoided, energy consumption is reduced, the appearance of the film is not affected after low-temperature and low-pressure plasma treatment is carried out on the polytetrafluoroethylene film, the excellent characteristics of polytetrafluoroethylene are reserved, the performance of the prepared polytetrafluoroethylene organic silicon pressure-sensitive adhesive tape can be effectively kept for a long time, a and the adhesive tape can be used in various environments and is wider in application range.

The invention discloses a method for transferring a graphene film on a metal substrate. The method comprises the steps of placing the metal substrate with the graphene film in an etching solution in awater tank, and carrying out complete etching on the metal substrate; pumping out the etching solution in the water tank through an injector, injecting cleaning liquid into the water tank, and cleaning the graphene film and the protective film for multiple times; pumping out the cleaning liquid, attaching and transferring the graphene film and the protective film to a target substrate, taking outthe target substrate, and heating and drying the target substrate for the first time; placing the heated and dried target substrate on the bottom surface of the water tank, injecting an acetone solution into the water tank to dissolve the protective film, and extracting the acetone solution; and taking out the target substrate and heating and drying the target substrate for the second time to finish the transfer of the graphene film, thereby realizing the technical effects of transferring the graphene of the metal substrate in a large area and reducing the breakage of the graphene film in thetransfer process.

The invention relates to the technical field of pipeline conveying equipment, in particular to a composite steel pipe. The composite steel pipe comprises a pipe body, wherein the pipe body is formed by a stainless steel layer and a PE resin layer in a combined mode, the stainless steel layer is located on the outer layer of the pipe body, and the PE resin layer is located on the inner layer of the pipe body. The pipe body is designed to the combined structure of two kinds of materials, the stainless steel layer is located on the outer layer of the pipe body, the PE resin layer is located on the inner layer of the pipe body, the two kinds of materials supplement each other, not only is the good performance of the stainless steel layer reserved, but also the anti-corrosion, anti-aging and long-service life advantages of the PE resin layer are played, the overall performance of the pipe body is improved, cost is saved, and the requirements of the work environment are met.

The invention discloses a printing and dyeing process of a Modal fiber elastic textile. The printing and dyeing process comprises the processes of singeing, cold stacking, refining, dyeing and post-finishing. During refining, real silk fibers are put into a refining solution, wherein the refining solution contains a refining agent, the refining agent is a mixture of sodium sulfite and dioctyl sebacate, and the ratio of sodium sulfite to dioctyl sebacate is 1:1; the refining solution is heated to 98 DEG C at the speed of 2 DEG C / minute, the temperature is maintained constant for 60 minutes, andthen water is added. During post-finishing, a nano finishing agent is adopted for prevention finishing in four aspects. The printing and dyeing process not only maintains the original excellent characteristics of a knitted fabric but also has the advantages that the performance of prevention in the four aspects is great, the strength loss is small, the dyeing fastness is high, a ventilation function is achieved, the printing and dyeing process is reasonable, and various chemical indexes of products meet the requirements of Oeko-Tex100 according to detection. Additionally, the printing and dyeing process has the advantages that the operation is easy and convenient and the process conditions are easily controlled.

The invention discloses a 3,4-perylene dicarboxylate ester compound, and a synthetic method and applications thereof. The structure of the 3,4-perylene dicarboxylate ester compound is represented by formula I, wherein R is used for representing hydrocarbon alkyl with 6 or fewer carbon atoms. The 3,4-perylene dicarboxylate ester compound possesses excellent fluorescence groups, and the benzene rings possess more reaction sites capable of realizing reaction with other substances. The synthetic method comprises following steps: a perylene-3,4-anhydride-9,10-perylene dicarboxylate compound is dissolved in quinoline; Cu2O is added; and the 3,4-perylene dicarboxylate ester compound is obtained via reflux reaction under oxygen-free conditions. The synthetic method is simple, is high in yield, and is suitable for industrialized production.

The invention discloses a ceramic Erhu, which comprises an Erhu cylinder, an Erhu rod, an Erhu shaft, an Erhu bridge, an Erhu bracket and the like, wherein the Erhu cylinder, and / or the Erhu rod, and / or the Erhu shaft, and / or the Erhu bridge, and / or the Erhu bracket are sintered and molded by fiber-reinforced ceramics. According to the present invention, by adding the high-strength ceramic fibersto the ceramic, the strength and the toughness of the ceramic are greatly improved; and compared with the traditional wooden Erhu, the Erhu of the present invention has the following characteristics that the Erhu body is not affected by the temperature, the humidity and the fatigue stress, the environment induced Erhu sound quality change cannot be generated, the water absorption rate and the expansion rate are extremely low, the material is fine, the physical properties at each place are uniform, the sound effect of the Erhu is consistent, the tuning time of the performer can be reduced, thestable and rich sound quality can be achieved compared with the traditional wooden Erhu body, and the playing effect of the Erhu is improved.

The invention discloses graphene based on lignin in-situ generation and a preparation method thereof, and belongs to the technical field of nano material preparation. The method comprises the following steps: by adopting a high-temperature sintering technology and taking lignin as a carbon source, carrying out high-temperature pyrolysis process treatment on the lignin, and then carrying out cooling process treatment, so as to prepare the graphene based on lignin in-situ generation. Therefore, the method disclosed by the invention is simple to operate and good in repeatability, avoids using an organic solvent, a dispersing agent, a chemical reducing agent and a stabilizing agent, and has the advantages of being green, environment-friendly, low in cost, economical and energy-saving. The lignin-based in-situ generated graphene prepared by the preparation method forms a crystal lamellar structure, and is single-layer graphene, multi-layer graphene or a mixture of the single-layer graphene and the multi-layer graphene, so that the lignin-based in-situ generated graphene has good dispersity and stability and has industrial production prospects and application value.

The invention discloses an organic photoelectric detector bottom electrode and a preparation method and application thereof, which belong to the technical field of semiconductor photoelectric devices.The organic photoelectric detector bottom electrode comprises a substrate; a bottom electrode structure composed of a main body layer and a function adjusting layer is arranged on the substrate; andthe main body layer and the function adjusting layer are respectively prepared through an electron beam evaporation method. A double-layer composite structure metal electrode (Al-NiCr) is adopted, themain body layer has high reflectivity from a visible band to an infrared band, and the absorption efficiency of incident light is improved; the growth function adjusting layer can be matched with thecathode buffer layer, protect the main body layer and prevent the main body layer from being oxidized and eroded by water vapor; and the application of the organic photoelectric detector can be greatly promoted.

The invention discloses an intermediate propagation method for tissue culture of leek. The intermediate propagation method comprises the following steps: pre-treating leak seeds, sterilizing and disinfecting the leek seeds, harvesting sterile seedlings, preparing cotyledon, stems and root section explants, inducing calluses and buds, performing rooting culture, performing acclimatizating and transplanting and the like. As the cotyledon, the stems and the root sections of the sterile seedlings of the leek can all successfully form regenerated plants in an induced differentiation manner, the utilization rates of different parts of the sterile seedlings are greatly increased, the regeneration frequency of the explants is remarkably increased, and a stable basis is made for intermediate propagation of tissue culture of the leek. In addition, by using a method that saw dust is adopted as a matrix in the transplanting process and water is sprayed to keep the saw dust wet in the period, the survival rate of the transplanted regenerated leek plants can be greatly increased, and a propagation technique for intermediate propagation of tissue culture of the leek is powerfully ensured.

The invention discloses an intermediate propagation method for tissue culture of leek. The intermediate propagation method comprises the following steps: pre-treating leak seeds, sterilizing and disinfecting the leek seeds, harvesting sterile seedlings, preparing cotyledon, stems and root section explants, inducing calluses and buds, performing rooting culture, performing acclimatizating and transplanting and the like. As the cotyledon, the stems and the root sections of the sterile seedlings of the leek can all successfully form regenerated plants in an induced differentiation manner, the utilization rates of different parts of the sterile seedlings are greatly increased, the regeneration frequency of the explants is remarkably increased, and a stable basis is made for intermediate propagation of tissue culture of the leek. In addition, by using a method that saw dust is adopted as a matrix in the transplanting process and water is sprayed to keep the saw dust wet in the period, the survival rate of the transplanted regenerated leek plants can be greatly increased, and a propagation technique for intermediate propagation of tissue culture of the leek is powerfully ensured.

The invention relates to reinforcing liquid for paper cultural relic protection. The reinforcing liquid for the paper cultural relic protection is prepared from the following raw materials by weight percent: 30% to 75% of hexamethylene diisocyanate trimer, 0.5% to 4% of nano silica, 0.1% to 0.3% of dibutyltin dilaurate and 20.7% to 68.9% of N,N-dimethylformamide, the nano silica is dried to obtaindried nano silica; the hexamethylene diisocyanate trimer is added into the N,N-dimethylformamide, dissolved, and kept warm for 5 to 10 minutes to obtain a mixed solution; the dried nano silica is added into the mixed solution, and the dibutyltin dilaurate is added and heated to 70 DEG C. When an isocyanate group content is up to 15% to 50%, the reinforcing liquid of the invention is obtained; thereinforcing liquid for the paper cultural relic protection is scientific and reasonable in composition, rich in raw materials, easy to produce and prepare, and good in use effect. The reinforcing liquid for the paper cultural relic protection is innovation of the reinforcing liquid for the paper cultural relic protection, and has enormous economic and social benefits.

The invention discloses a breeding method for reducing the cadmium content of rice grains. CRISPER / Cas9 technology is used to knock out the rice OsNCX8 gene in a targeted manner to obtain transgenic plants knocked out of the OsNCX8 gene, from which a homozygous plant with complete inactivation of the OsNCX8 protein is selected to finally obtain Plants without genetically modified ingredients and reduced cadmium content in rice. The OsNCX8 protein is the first member of the sodium-calcium exchange protein family identified in rice, and the inactivation of the OsNCX8 protein leads to a reduction of about 45% in grain cadmium content. Moreover, the agronomic traits of plants with OsNCX8 protein inactivation were not significantly changed compared with normal plants. at T 0 Homozygous plants with complete inactivation of the OsNCX8 protein can be obtained from the offspring plants, which greatly shortens the breeding time, and plants without transgenic components can be screened from their offspring, avoiding the safety hazards caused by transgenes.