57results about How to "Has biodegradable properties" patented technology

The invention discloses a Zn-Mg zinc alloy and a preparation method and application thereof. The zinc alloy contains Zn and Mg; and the weight percentage of Mg in the zinc alloy is 0-20%, 0 not included. The zinc alloy further contains microelements which are at least one of strontium, calcium, silicon, phosphorus, lithium, silver, tin and rare earth elements; and in the zinc alloy, the mass percentage of the microelements is 0-3%, 0 not included. The mechanical performance of the Zn-Mg zinc alloy accords with the strength and toughness requirements of a medical implant material; the Zn-Mg zinc alloy is non-toxic, has excellent histocompatibility and blood compatibility, and can be degraded in vivo; and metal ions obtained from dissolving can be absorbed and used by living bodies to promote bone growth, or can be removed from the bodies through metabolism.

The invention discloses an adsorption method for preparing hydroxyapatite pesticide and slow-release fertilizer compound, which comprises the following steps: soaking a nano hydroxyapatite carrier in phosphate buffer solution, then adding a starting material into the buffer solution and continuously stirring the mixture to form compound solution, finally centrifuging the compound solution to obtain sediment, and drying the sediment to obtain the compound. By using a porous structure of the nano hydroxyapatite self to embed medicaments into an internal grid of the carrier, the burst effect of the medicaments is avoided, the medicinal effect is long, the medicament residue is greatly reduced, and the medicaments are safer. A product obtained by using the nano hydroxyapatite as a pesticide and fertilizer carrier has the advantages of reliable quality, strong stability, safe use and low cost, greatly improves the medicament loading amount and adsorption amount, is easy for continuous production, and has good application prospect.

The invention relates to a method for preparing high-hydroscopicity resin in uniform-phase aqueous medium by using straw as a raw material. The method comprises the following steps: adopting a double-phase saline aqueous solution system of inorganic acid and polyethylene glycol to sequentially process the straw to obtain cellulose; then, adding the cellulose to a pre-prepared sodium hydroxide-urea aqueous solution or a lithium hydroxide-urea aqueous solution; putting the solution in a refrigerator to be cooled, taking out the solution for mechanically stirring to obtain a uniform cellulose solution; afterwards, adding propenyl monomer to the obtained cellulose aqueous solution and carrying out homogeneous glycerol polymerization to obtain the high-hydroscopicity resin. The hydroscopicity resin has the advantages of low cost, high hydroscopicity and potential biodegradable characteristic and has wide application space in the fields, such as agriculture, forestry, sanitary health products, building materials, perfume emission, and the like.

The invention discloses a preparation method for a lactide grafted plant fiber reinforced poly lactic acid composite material. The preparation method comprises: carrying out an alkali liquid soaking treatment on plant fibers, and drying; mixing the resulting plant fibers and a lactide monomer; carrying out a graft reaction under an anhydrous and anaerobic condition under a catalysis effect of stannous octanoate to obtain lactide grafted plant fibers; drying; mixing the dried lactide grafted plant fibers and ungrafted plant fibers; and carrying out blending, hot pressing molding and cooling shaping on the mixed fibers and completely-molten poly lactic acid to obtain the composite material. According to the present invention, lactide ring opening polymerization is adopted to carry out a graft treatment on plant fibers to change surface polarity of the fibers so as to improve interface compatibility between the plant fibers and the poly lactic acid matrix, and improve the whole performance of the composite material; compared with pure poly lactic acid and untreated plant fiber reinforced poly lactic acid composite materials, the composite material prepared by the preparation method of the present invention has the following characteristics that: interface properties between the plant fibers and the poly lactic acid matrix, and mechanical properties are significantly improved.

The invention discloses a Zn-Ca series zinc alloy as well as a preparation method and application of the Zn-Ca series zinc alloy. The zinc alloy comprises Zn and Ca, wherein the mass percent of Ca in the zinc alloy ranges from 0% to 30%, but is not equal to 0. The zinc alloy also comprises trace elements including Si, P, Li, Ag, Sn and at least one selected from rare earth elements, wherein the mass percent of the trace elements ranges from 0% to 3%, but is not equal to 0. The mechanical property of the Zn-Ca series zinc alloy disclosed by the invention meets the requirements for strength and toughness of a medical implant material, is nontoxic and favorable in tissue compatibility and blood compatibility, can be degraded by using body fluid and can be applied to preparation of medical implants; and the dissolved metal ions can be absorbed and utilized by living bodies to promote bone growth or can be discharged out of bodies through metabolism.

The invention discloses a method for feeding crayfishes by nano feeds. The method comprises the following steps: putting juvenile prawns into a paddy field with the characteristics of sufficient water source, convenience in irrigation and drainage, good water retention capability, non drought in dry weather, no flooding, good ecological environment, no pollution source, fertile soil and natural substrate, and then putting grass carp summer flowers, bighead carp summer flowers, snails and the like into the paddy field. By adding a compound microorganism fertilizer, the crayfishes can be promoted to grow quickly, the EPA (eicosapentaenoic acid) content can be increased, the diseases of the crayfishes are reduced, the fatality rate is reduced, beneficial microorganisms in a water body are added, and the final quality is improved.

The invention relates to a composite type polymeric flocculant which is mainly applied to the fields such as sewage treatment, sludge thickening, paper pulp recovery, petroleum extraction, etc. The composite type polymeric flocculant is characterized by being prepared by raw materials by weight percent: 40-45% of elm bark grass powder, 30-35% of cactus powder, 5-10% of sodium carboxymethyl cellulose and 15-20% of polyacrylamide. The flocculant can be normally used at higher temperature and under the condition of wider range of pH value.

Provided is a method for feeding myxocyprinus asiaticus by the adoption of nano controlled-release feed. A cultivating pool is a circular or square cement pool, the area of the cultivating pool is 12-20m<2>, and the depth of the cultivating pool is 0.7-1m; the method needs to meet the requirements for good water circulation and pollution discharge functions; water is transparent and clear and does not contain harmful heavy metal ions, water of 70-100cm depth flows into the pool for the first time, dbdmh of 0.3mg / L is used for disinfecting the water, and healthy individuals without disease are chosen to be placed in the cultivating pool. By the adoption of the method, scientific and refined feeding is carried out, the yield-increasing effect is obvious and survival rate is high within a short time, and the method is suitable for industrialized and large-scale development.

The invention discloses a method for breeding finless eel by nano feeds. The method comprises the following steps: selecting a pond which is in east and west directions, has a length-to-width ratio of 3 to 2, an area of 2000-10000m<2>, a pond ridge height of 1.8-2.0m and a stable water level of 1.4-1.5m, and is provided with perfect water drainage facilities as a breeding pond; disinfecting the pond in 10-15 days before finless eel fries are put into the pond, draining off water in the pond, checking whether holes are formed, cleaning the pond by unslaked lime, and feeding the finless eel fries with multifunctional microorganism feeds. Through comparison, and by adding a compound microorganism fertilizer, the finless eel can be promoted to grow quickly, the EPA (eicosapentaenoic acid) content can be increased, the finless eel diseases are reduced, the fatality rate is reduced, meanwhile beneficial microorganisms in a water body are added, and the final quality is improved.

The invention relates to the technical field of plastic modification and processing, particularly relates to polylactic acid bioplastic, and more particularly relates to high-fluidity PLA bioplastic. A formula of the bioplastic comprises 94.5-98.8% of polylactic acid (with the melt flow rate at 190 DEG C / 2.16 kg being 5 g / 10 min to 50 g / 10 min), 1-5% of an initiator and 0.1-0.5% of an assistant additive. The bioplastic is prepared by 1) weighing raw materials according to the formula, 2) adding the weighed raw materials into a high-speed mixer, and performing dry mixing, and 3) feeding the mixed raw materials into a twin-screw extruder, melting, extruding and granulating to obtain a product. By adoption of the technical scheme, the product is biodegradable, forming and processing of the product are stable and reliable because of the high-fluidity PLA, performance and quality of the product are improved, degradation of the product after the product is abandoned is rapid and free of pollution, and the bioplastic is environmental friendly, low in production cost, simple in process and easy in popularization and application.

The invention relates to a hyacinth plant based nano slow-release oil suspending agent and a preparation method thereof. The suspending agent provided by the invention can be used for soil treatment after planting before seedling, and has the characteristics of farmland weed eradication and broad-spectrum sterilization. Compared with the prior art, the formulation provided by the invention has the characteristics of favorable weed eradication effect, high safety for environment and the like, and the weed can not easily generate drug resistance, thereby having wide application prospects.

The invention discloses a microbial nano sustained-release fish feed and a preparation method thereof. The microbial fish guano comprises the following components in parts by weight: 2-4 parts of bacillus subtilis powder, 1-4 parts of ferment bacteria, 0.5-0.9 parts of solid photosynthetic bacteria, 0.8-1.2 parts of bdellovibrio bacteriovorus, 0.2-0.6 parts of vitamin additive, 10-16 parts of mineral additive, 0.2-0.4 parts of chelating agent, 60-80 parts of water hyacinth and the like. The microbial fertilizer added with the microbial fish guano disclosed by the invention can be used for promoting quick growth of fish and improving the quality and mass of the fish; moreover, beneficial microorganisms in water are increased, and the fish disease can be effectively prevented, so that the farming method adopting the microbial fish guano is economical and effective.

The invention discloses a process method for producing a magnesium silicate fiber blanket by smelting residual fusion slag of ferronickel through utilizing laterite-nickel ore. The method comprises the following steps of: by utilizing laterite-nickel ore fused waste residues as a basic raw material, adding limestone powder, dolomite powder, talc powder, basalt powder and kaolin powder into a maintaining furnace, entering a melt launder after thermally insulating for 40-50 minutes, passing through a four-roller centrifuge, preparing magnesium silicate fiber yarns in a fiber forming chamber by continuously throwing through the centrifuge and spraying through the high pressure air, extruding to cotton by a cotton collector, after forming the cotton, solidifying and cooling, entering an opposite puncture needle machine, needling to the magnesium silicate fiber blanket, thermally treating at 700-900 DEG C, and at last, cutting and forming according to the size. The magnesium silicate fiber blanket provided by the invention has high content of alkaline earth oxides, is a soluble fiber, and can be widely applied to the fireproof, heat insulation, thermal insulation and sound-proof fields.

The invention provides an anti-oxidation silver-plated nylon fiber with a protective film. An adhesive layer adopted in the fiber can not only stabilize and protect the silver element in the silver-plated nylon fiber on the inner side but also prevent external human sweat and air erosion; the nylon fiber is pretreated with a sodium hydroxide solution, so that the precipitation of silver metal on the surface of the nylon fiber in the later stage is facilitated; when the nylon fiber is soaked in a silver ammonia solution, the silver metal can be uniformly precipitated and adsorbed on the surfaceof the nylon fiber by using an ultrasonic device for oscillation. The adhesive layer not only utilizes the viscosity of silica gel, can be used as a good connecting agent between an inner layer and an outer layer, ensures the stability between the inner and outer layers, but also can prevent the silver-plated nylon fiber from being oxidized and consumed in a subsequent reaction. Pigment materialscontaining different compositions are added into the adhesive layer so that the outer surface of the fiber can have different colors, there is no need to conduct dip dyeing on the exterior of the fiber again, and oxidative corrosion caused by external chemicals to a silver material is avoided.

The invention discloses a degradable biological-based waterborne emulsion and a preparation method thereof. The preparation method comprises the following steps: carrying out a polymerization reaction on purified L-lactide, epsilon-caprolactone and polyol under the action of a catalyst, to obtain hydroxyl-terminated polyester polyol with the viscosity average molecular weight of 1000-10000; carrying out a reaction of hydroxyl-terminated polyester polyol, diisocyanate and a hydrophilic chain extender under the action of a catalyst, to obtain a prepolymer; and adding an emulsifier and water in the prepolymer, carrying out high-speed stirring emulsification, and carrying out a reaction with a crosslinking agent, to obtain the degradable waterborne emulsion. The degradable biological-based emulsion and the preparation method thereof are novel; the polylactide and caprolactone random copolymer which can be fully biodegradable is obtained, has relatively low glass transition temperature (Tg), has better emulsifying dispersion than polylactide, does not contain organic solvents, is biodegradable, can be widely applied in coatings, adhesives, fabric coating layers and other fields, is a quite good environmental-protection material, and has broad market prospects.

The invention discloses liquid fuel. The component of the liquid fuel comprises dialkyl carbonate with the molecular formula of CnH2n+1-[OCOO]-CmH2m+1, wherein the n is not smaller than 1 and is not greater than 8, and the m is not smaller than 2 and is not greater than 8. The liquid fuel disclosed by the invention has the characteristics of no toxin and biological degradation, has the advantages of traditional fossil-based and biological liquid fuel simultaneously, is better than fossil-based liquid fuel in the aspects of the lubricating property, the discharging property, the noise reducing property, the volatility, the safety, the environment-friendly property and the like and is better than biological liquid fuel in the aspects of the low-temperature property, the compatibility of a sealing material, the heat and oxidation stability, the corrosiveness, the price and the like. The liquid fuel disclosed by the invention has high comprehensive performance-price ratio, exceeds traditional liquid fuel in an omnibearing way in functions and can be widely used for the fuel of a motor vehicle, the fuel of weaponry and equipment, fuel for cooking, central heating and the like, fuel for power generation, fuel for an extremely harsh requirement to a working condition, fuel for a high requirement to environmental protection and fuel for a high requirement to the healthy safety.

The invention belongs to the technical field of novel nanometer medicinal preparation, and more specifically relates to a melittin liposome nanometer preparation, and a preparation method and applications thereof. The melittin liposome nanometer preparation contains melittin liposome which at least contains melittin, an anionic polymer, and a cationic lipid carrier. The raw materials are safe, andare easily available; the preparation method is simple in operation, and is high in repeatability; the particle size and uniformity of the liposome preparation are ideal, drug loading amount is large, preparation stability is excellent, storage is convenient, melittin leakage amount is low, no hemolysis is caused, the toxicity is low, biodegradable characteristic is achieved, functionalization modification can be realized, long circulation in a circulation system and tumor active and passive targeting distribution function are achieved, and large scale production can be realized.

The invention provides a preparation method of a biodegradable oil and water separation porous film. The preparation method comprises the following steps of using tetraethoxysilane and methanol solution as the raw materials, and adopting a sol-gel method to prepare a silicon dioxide gel; modifying in a hydrophobic way, and drying under the supercritical condition, so as to obtain a silicon dioxideaerogel; adding the silicon dioxide aerogel into an ethanol solution, so as to prepare a silicon dioxide aerogel / ethanol dispersing liquid for further use; preparing a polylactic acid thin film by anon-solvent induced phase separating method, dissolving the pretreated polylactic acid into a solvent, and stirring at constant temperature, so as to obtain a film casting liquid; pouring the film casting liquid onto the surface of a clean glass flat plate, scraping into a film by a scraping knife with certain thickness, soaking the preformed polylactic acid thin film into the ethanol dispersing liquid containing the silicon dioxide aerogel, curing, and drying, so as to obtain the silicon dioxide aerogel@polylactic acid thin film. The preparation method of the biodegradable oil and water separation porous film has the advantages that the preparation technology is simple, the oil and water separation property is excellent, the biodegradable effect is realized after use, and the applicationprospect is broad.

The invention relates to a corncob-decomposed organic nanometer fertilizer. The corncob-decomposed organic nanometer fertilizer is characterized by being prepared through the following active ingredients in parts by weight: 55-60 parts of corncobs, 1-15 parts of Chinese stellera root, 5-10 parts of European hop flower, 25-30 parts of pericarpium zanthoxyli, 25-30 parts of ginkgo seed peels, 26-30 parts of fructus cnidii and the like. The corncob-decomposed organic nanometer fertilizer can prevent and remove farmland weeds and has the broad-spectrum antibacterial characteristic; compared with the prior art, the corncob-decomposed organic nanometer fertilizer has the characteristics that weeding effect is good, environment is safe, weeds difficultly produce pesticide resistance and the like, thus the corncob-decomposed organic nanometer fertilizer is wide in application prospects.

The invention discloses a method for preparing polyether glycol with rape stalks as raw materials. The method comprises the following steps: firstly, crushing and baking rape stalks to obtain stalk powder; adding a liquefying agent and a catalyst into a container in sequence according to a mass ratio of 100:(1-5); heating the liquefying agent and the catalyst to 100-150 DEG C while stirring the liquefying agent and the catalyst so as to obtain a mixed solution; adding the stalk powder to the mixed solution according to the fact that the mass ratio of the liquefying agent to the stalk powder is (4-8):1; continuing to heat obtained mixture to 120-170 DEG C, reacting for 60-180 min; naturally cooling to the room temperature; adjusting the pH value of a reaction liquid to 6-7; finally, carrying out filtering and reduced pressure distillation, so as to obtain the polyether glycol with the rape stalks as the raw materials. The polyether glycol with the rape stalks as the raw materials has infrared characteristic absorption peaks at two wave numbers of 1108-1112 cm<-1> and 3420-3440 cm<-1>, the hydroxyl value of the polyether glycol with the rape stalks as the raw material is 150-480 mg KOH / g, and the viscosity of the polyether glycol with the rape stalks as the raw material is 400-4500 mPa.s / 25 DEG C.

The invention discloses a method for breeding artificial aeguidens rivulatus fries by nano feeds. The method comprises the following steps: selecting a breeding facility, namely a square pond with the characteristics of flat bottom, less sludge, convenience in irrigation and drainage and average water depth of 0.8m; disinfecting the pond by 10mg / L of trichloroisocyanuric acid in 10 days before aeguidens rivulatus is put into the pond; keeping clear water and the pH value to be 7.8, wherein aeguidens rivulatus fries are hatched out by fertilized ova after 2-3 days and can freely move for finding foods in another 5-6 days; feeding the aeguidens rivulatus fries with fairy shrimps or small water fleas for four times each day in the beginning; after half a month, feeding the aeguidens rivulatus fries with blood worms (cladocerans); after a month, feeding the aeguidens rivulatus fries with artificial compound feeds, optimally selecting and using feeds with high protein content such as fresh fish meat, shrimp meat and snail meat, also selecting and using compound feeds, and generally feeding the aeguidens rivulatus fries with animal feeds for improving the nutrition and promoting the gonad development of parent fishes in a breeding season.

The invention discloses a method for preparing a slow release feed for carps by adopting nano materials. A composite microorganism fish fertilizer specially used for the carps comprises the following components in parts by weight: 2-4 parts of nitrogen-fixing bacteria, 1-3 parts of phosphate solubilizing bacteria, 3-5 parts of enzyme bacteria, 50-60 parts of fish meal, 75-80 parts of bean cakes, 20-30 parts of bran, 70-80 parts of rice bran, 10-14 parts of brown sugar, 8-10 parts of yeast powder, 12-15 parts of edible salt and the like. The composite microorganism fertilizer disclosed by the invention can promote rapid growth of fish and also improve the grade and the quality of the fish, so that diseases of the fish can be reduced; meanwhile, beneficial microorganisms in water can be increased, and the growth of phycophyta in a fishpond is alleviated.

The invention relates to an environment-friendly deodorant and a preparation method thereof. The method comprises the following steps: firstly adding beta-cyclodextrin into a water body, then adjusting the pH value of the water body by using alkali liquor, and then adding a cationic etherifying agent and stirring, and adding hydrochloric acid to adjust pH, and then performing vacuum drying; dissolving the dried product with N, N-dimethylformamide, filtering, precipitating the filtrate with acetone, and carrying out vacuum drying on the obtained precipitate to obtain a modified beta-cyclodextrin; subjecting plant fibers to defibering to prepare a fiber suspension, and circularly grinding the fiber suspension in a colloid grinder; homogenizing by using a high-pressure homogenizer to obtain nano microfibrils; adding the nano microfibrils into water, then adding the modified beta-cyclodextrin and water-soluble chitosan, stirring, and finally carrying out ultrasonic treatment by using an ultrasonic cleaner to obtain the environment-friendly deodorant. The raw materials used by the environment-friendly deodorant are natural high polymer materials. The raw materials have the characteristics of simplicity, easiness in obtaining, reproducibility and the like, also have the characteristic of biodegradability, and are environment-friendly.

The invention relates to a humulus lupulus plant based nano slow-release oil suspending agent and a preparation method thereof. The suspending agent provided by the invention can be used for soil treatment after planting before seedling, and has the characteristics of farmland weed eradication and broad-spectrum sterilization. Compared with the prior art, the formulation provided by the invention has the characteristics of favorable weed eradication effect, high safety for environment and the like, and the weed can not easily generate drug resistance, thereby having wide application prospects.

The invention provides a nano calcium phosphate / polymer directional hole composite material and a preparation method thereof, which relate to an antibiotic medical vector material and a preparation method thereof. The nano calcium phosphate / polymer directional hole composite material consists of nano calcium phosphate, polymers and a directional hole structure, wherein the directional hole structure is that tubular holes are directionally distributed in a nano calcium phosphate / polymer substrate; the aperture is between 1 and 50 micrometers, and the porosity is between 30 and 80 percent; and hole walls can be partially communicated with each other. The preparation method comprises that: the nano calcium phosphate, a solvent and polymer organic phases are driven to form multiphase metastable state colloid by the action of a surfactant; the metastable state colloid is destabilized after freezing and subjected to water-phase separation; separated water is condensed into ice which is then taken as a template; water phase is induced to be solidified in certain direction by controlling the direction and the velocity of the freezing process; and the ice is sublimed by vacuum drying, and the directional porous structure is formed in the calcium phosphate / polymer composite material. The material has good biological structural hole characteristics, and can be taken as an engineering material of a tissue structure and a medical vector material for treating bone infection.

The embodiment of the invention discloses a degradable biomedical material Zn-Si-X zinc alloy and a preparation method, and belongs to the technical field of medical degradable alloys. The Zn-Si-X zinc alloy comprises the main elements of Zn, Si and X, X is at least one of Ga, Ge, Cu, Ag, Mn, Mg, Ca, Sr, Fe, Ti, Zr, Sn, Y, Nd and Yb, Si, in percentage by weight, is larger than 0 and smaller than or equal to 20 wt%, and X, in percentage by weight, is larger than or equal to 0 and smaller than or equal to 15 wt%. The preparation method comprises the following steps of mixing Zn, Si and X elements, smelting or sintering or applying a coating after smelting or sintering to obtain the Zn-Si-X alloy. According to the alloy and the method, the mechanical property of the prepared zinc alloy meets strength and toughness requirements of medical implants, meanwhile, the zinc alloy can be degraded in vivo, and the zinc alloy has a biological corrosion degradation characteristic and an appropriate corrosion rate so as to provide long-term and effective mechanical support dual characteristics.

The invention relates to a composite type polymeric flocculant which is mainly applied to the fields such as sewage treatment, sludge thickening, paper pulp recovery, petroleum extraction, etc. The composite type polymeric flocculant is characterized by being prepared by raw materials by weight percent: 40-45% of elm bark grass powder, 30-35% of cactus powder, 5-10% of sodium carboxymethyl cellulose and 15-20% of polyacrylamide. The flocculant can be normally used at higher temperature and under the condition of wider range of pH value.

The invention discloses a Zn-Ca series zinc alloy as well as a preparation method and application thereof. The zinc alloy of the present invention includes Zn and Ca; in terms of weight percentage, the mass percentage of Ca in the zinc alloy is 0-30%, but 0 is not included. The zinc alloy also includes trace elements, and the trace elements are at least one of silicon, phosphorus, lithium, silver, tin and rare earth elements; in the zinc alloy, the mass percentage of the trace elements is 0 ~3%, but excluding 0. The mechanical properties of the Zn-Ca-based zinc alloy of the present invention meet the requirements of the strength and toughness of medical implant materials, are non-toxic, have good tissue compatibility and blood compatibility, and can be degraded by body fluids at the same time, and the dissolved metal ions It can be absorbed and utilized by organisms to promote bone growth or be excreted from the body by metabolism, and can be applied to the preparation of medical implants.

The invention relates to a chitosan direct quaternary ammonium salt for low-salt dyeing of reactive dyes and a preparation method of the chitosan direct quaternary ammonium salt. With chitosan and methyl iodide as raw materials, and potassium iodide as a catalyst, chitosan derivatives are subjected to friedel-crafts reaction in an alkaline solution to generate the chitosan direct quaternary ammonium salt. The chitosan direct quaternary ammonium salt obtained by the preparation method is biodegradable, and is applied to low-salt dyeing assistants of reactive dye cotton fabrics; and the salt dosage when the reactive dye cotton fabrics are dyed is effectively reduced under the premise of not affecting the dye uptake of the reactive dyes.

The invention relates to a flanueria bidentis plant based nano slow-release oil suspending agent and a preparation method thereof. The suspending agent provided by the invention can be used for soil treatment after planting before seedling, and has the characteristics of farmland weed eradication and broad-spectrum sterilization. Compared with the prior art, the formulation provided by the invention has the characteristics of favorable weed eradication effect, high safety for environment and the like, and the weed can not easily generate drug resistance, thereby having wide application prospects.