59results about How to "To achieve the purpose of modification" patented technology

The invention provides a preparation method of hydroxyl modified poly-p-phenylene benzo imidazolinyl resin and application of the resin in high performance fiber preparation. 1,2,4,5-tetraaminobenzene hydrochloride and two hydroxy terephthalic acid are utilized as raw materials, hydrogen chloride is desorbed from polyphosphoric acid, and the hydroxyl modified resin is prepared by temperature programming mixed with polycondensation. The resin can be applied to spinning processing and made into high performance fiber, particularly poly-1, 4-(2, 5-dyhydroxy) phenylene-2, 6-benzo diimidazole resin can directly utilize poly phosphoric acid liquid crystal basic solution when polymerization is finished to conduct manual wire drawing or dry-jet wet spinning to obtain poly-1, 4-(2, 5-dyhydroxy) phenylene-2, 6-benzo diimidazole fiber, compression and composite adhesive performance of the fiber are improved, and production cost is reduced. The preparation method and the application provide a new way for replacing PBO and M5 fiber to implement commercialization production of the high-performance fiber and developing research direction of high-technology materials.

The invention relates to a white slag refining agent for an LF (Ladle Furnace) refining furnace, belonging to the technical field of steel making, in particular to the technical field of ladle slag modification treatment of the LF refining furnace. The invention aims to provide the white slag refining agent which has the advantages of low cost and strong inclusion adsorption capacity. The white slag refining agent for the LF refining furnace is characterized by comprising the following components in percentage by weight: 40-50 percent of calcium carbide, 8-14 percent of fluorite, 24-30 percent of limestone, 4-6 percent of bauxite and 4-12 percent of dolomite. The white slag refining agent has the advantages of low cost and wider application range and is suitable for a non Al deoxidized steel (a kind of steel, strictly controlling the aluminum content), for example. After being added into the LF refining furnace, the white slag refining agent can fulfill the functions of rapid deoxidation and white slag production and can enable the content of FeO and MnO in ladle slag to be no more than 1.5 percent to satisfy the smelting needs of high-grade steels.

The invention provides a method for modifying a carbon porous material, characterized in that by applying a high pressure pulse voltage on two opposite plate electrodes and inserting an electrolyte plate which has a high dielectric constant and a compact structure and has an area that is slightly larger than the size of the plate electrodes between the two opposite plate electrodes, a uniform discharge plasma reaction zone is formed between the plate electrodes; mixed gasses containing oxygen are uniformly mixed at normal temperatures and pressures, the mixed gasses are subject to ionization activation by the plasma reaction zone to generate a plurality of oxygen-containing plasma gasses, after gas distribution is carried out, the gasses vertically flow through a pre-cleaned carbon porous material in the thickness direction to react to obtain the activated carbon porous material. The method has the advantages of environmental protection, low cost, mild treatment conditions, easy control of function group quantity, and outstanding improvement of the activity of the electrode material, and the method can realize gradient treatment, can reduce the area resistance of the contacting surface of the porous material and the bipolar plate, so as to increase the battery efficiency. The method uses devices, thus the method is easy for industrialized operation.

The invention discloses an antibacterial and hemostatic bifunctional material and a preparation method thereof. Through oxidation grafting of polyethyleneimine, various forms of powder, film, gel, non-woven fabric or textile are obtained according to different cellulose substrates; the material provided by the invention has both antibacterial and hemostatic properties, and the antibacterial property is durable and stable, and can quickly stop bleeding and diminish inflammation without any medicine; and the preparation method of antibacterial cloth and an antibacterial and hemostatic dressing has the advantages of low reaction temperature, simple condition, low energy consumption, and easy large-scale industrial production.

The invention relates to a sludge dewatering process combining physical and chemical methods, in particular to a sludge treatment process which combines physical and chemical methods to achieve a higher dewatering rate. The process comprises the following steps: 1) delivering primary sludge into a sludge modifying machine; 2) adding a dewatering assistant into the sludge modifying machine, and stirring for 5-10 minutes; 3) adding a second dewatering assistant into the sludge modifying machine, and continuing to stir for 5-10 minutes; 4) discharging the sludge from the sludge modifying machine to obtain modified sludge; and 5) mechanically dewatering the modified sludge to obtain sludge cakes of which the water content is not higher than 40%. When being used for treating sludge, the invention has the advantages of high efficiency, low investment and low operating cost.

The invention discloses a lithium-ion battery positive pole piece which comprises a current collector and a positive active material layer coating the surface of the current collector, the positive active material layer mainly comprises a positive active material, a conductive agent, additives and a binder, and the additives are aluminum phosphate and lithium phosphate. The preparation method comprises the following steps: (1) uniformly mixing the positive electrode active material, the binder, the conductive agent, the aluminum phosphate, the lithium phosphate and an organic solvent to obtainpositive electrode slurry; and (2) coating the surface of the current collector with the positive pole slurry, and drying to obtain the positive pole piece of a lithium-ion battery. The aluminum phosphate and the lithium phosphate are introduced into the positive active material layer of the positive pole piece of the lithium-ion battery at the same time to serve as the additives, and the comprehensive electrical properties such as high-temperature cycle, high-temperature storage performance and rate capability of the battery are synergistically improved.

The invention discloses a doping modification method for a CVD (Chemical Vapor Deposition) ZnS crystal material. The doping modification method comprises the following steps: before deposition, adding a metal M into a zinc crucible, or an alloy Zn-M of M and zinc as a doping agent, performing heating melting, and uniformly mixing so as to obtain an M-doped zinc raw material; further performing chemcial vapor deposition, after deposition is completed, performing constant-temperature constant-pressure thermal treatment, thereby improving the mechanical and mechanical properties of the CVD ZnS crystal material. By adopting the method, on premise that the infrared permeation property of the CVD ZnS crystal material is not remarkably affected, the effect of improving the mechanical property of the CVD ZnS is achieved, the mechanical properties of the CVD ZnS crystal material are improved, the mechanical strength of the CVD ZnS crystal material is improved, the corrosion resistance and the thermal impact resistance is improved, and the method is applicable to on-scale production and commercial application.

The invention discloses a preparation method of hydrophobic silica powder. The method comprises the following steps: mixing a silane coupling agent N-phenyl gamma-aminopropyltrimethoxysilane, isopropanol and water, carrying out a hydrolysis reaction to obtain a silane coupling agent hydrolysate, atomizing the silane coupling agent hydrolysate by using an atomizer, mixing the atomized silane coupling agent hydrolysate with silica powder, and carrying out a modification reaction to obtain the hydrophobic silica powder. The method is simple in process, the prepared modified silica powder is high in activity, good in hydrophobicity and low in surface hydroxyl, and when the modified silica powder is applied to epoxy resin, the viscosity of the epoxy resin can be greatly reduced, and the dispersity of the epoxy resin in the resin is improved.

The invention relates to the technical field of food preservation, in particular to a treatment method for reducing the influence of SO2 preservatives on cherry pulp colors. Before cherry fruits are picked, the cherry fruits on trees are irradiated by ultraviolet lamps with illumination of 1-1.5mW / cm<2> at 10-12 o'clock every night for 40-50 minutes, the cherry fruits are continuously irradiated for 3 days, and the cherry fruits with stems are picked and preserved by the SO2 preservatives. Combination of anthocyanin and organic acid in the cherry fruits is promoted, acidized anthocyanin is formed, the anthocyanin is modified, stability of the anthocyanin is improved, the influence of SO2 on the anthocyanin is reduced, and cherry colors can keep a certain stability in the later period of preservation of the cherry fruits by the SO2 preservatives.

The invention relates to a method for preparing a modified urea resin. During the production process of urea resin, a small molecule methyl silanol aqueous solution which accounts for 0.4 percent to 30 percent of the total feeding amount by weight is added into raw material to carry out modification; or a small molecule methyl silanol aqueous solution with weight percentage of 0.4 percent to 30 percent is directly added into and mixed with the prepared urea resin. The method achieves the purpose of reducing formaldehyde release through changing the molecule structure and controlling the existence of free formaldehyde and methylene ether link and can also improve the resistance to water, weather and aging resistance and bonding strength of the urea resin.

The invention discloses a genistein positive ion nano lipid carrier and a preparation method thereof. Every 100ml of nano lipid carrier comprises the following components: 0.01-0.1g of genistein, 0.8-1.5g of solid lipid material, 0.5-1g of liquid lipid material, 0.1-0.2g of PEG (polyethylene glycol) modified liquid lipid material, 2-4g of emulsifier, 0.1-1g of copolymer of methacrylic acid and methacrylate and the balance of water. The prepared genistein positive ion nano lipid carrier is round in appearance and uniform in mass, encapsulation efficiency is more than 85%, and biocompatibility and biodegradability are good. By adopting the genistein positive ion nano lipid carrier, solubility of genistein is improved, in vitro release of genistein is prolonged, and the aims of prolonging intraocular preparation retention time and reducing toxic and side effects of a medicine are achieved.

The invention discloses a cobalt salt adhesive for adhering ethylen e-propylene-diene mischpolymere and a bare steel framework and a preparation method thereof. The adhesive comprises a compound adhesive, phenolic resin and aids, wherein the compound adhesive consists of a main adhesive and an auxiliary adhesive; the main adhesive comprises cobalt boroacylate and cobalt neocaprate; the auxiliary adhesive is vanadium isooctanoate and cerium isooctanoate; the phenolic resin comprises a methyl donor and a methyl receptor; and the aids comprise a toughening agent, an activator, a curing activator, a silane coupling agent and a curing agent. The preparation method comprises the following steps of: dispersing the compound adhesive in the phenolic resin carrier, and matching with the aids; and adhsdissolving by using a mixed solvent to prepare adhesive cement to obtain the cobalt salt adhesive for adhering the ethylen e-propylene-diene mischpolymere and the bare steel framework. The cobalt salt adhesive has the advantages of high thermal stability, high dynamic mechanical properties, direct coating, low cost, and application to adhering ethylen e-propylene-diene mischpolymere including mixed rubber of the ethylen e-propylene-diene mischpolymere, natural rubber, reclaimed rubber or reclaimed rubber powder and the bare steel framework material.

The invention relates to a rubber homogenization wear-resistant agent. According to a formula, the rubber homogenization wear-resistant agent comprises, by weight: 30 of a urea-aldehyde acid sodium polymer, 12 of hexamethylenetetramine, and 2.5 of NH4CL. Preferably, the rubber homogenization wear-resistant agent can be added with 15 of octadecanol, 20 of white carbon black, and 20 of a plasticizer. The rubber homogenization wear-resistant agent creatively can promote uniform dispersion of high viscosity rubber and the additives, and can well reach the effects of solubilizing, wear resisting, and wetting, etc. The raw materials and the formed product are compatible with rubber, and do not get in the way of rubber products. The rubber homogenization wear-resistant agent has easily available raw materials, a low cost and economical efficiency. During sulfidation of rubber, a cross-linking effect can be generated, and a new sulfidation network can be formed, thus reaching the purpose of modification. The rubber homogenization wear-resistant agent provided in the invention can reduce wear by 13-24%.

The invention discloses a hydrophilic / hydrophobic polyacrylamide and polystyrene interpenetrating polymer network and application thereof. The particle size distribution of the hydrophilic / hydrophobicpolyacrylamide and polystyrene interpenetrating polymer network is 0.25-0.85mm, the average aperture is 8-40nm, the active amino content is 0.6-2.2mmol / g, the average specific surface area is 150-1000m<2> / g, and the total pore volume is 0.5-1.3cm<3> / g. The hydrophilic / hydrophobic polyacrylamide and polystyrene interpenetrating polymer network is prepared, hydrophilic amide groups and hydrophobicfunctional groups are introduced, straw hydrolysate is subjected to detoxification treatment, thus intermolecular hydrogen bonds are formed between the hydrophilic amide groups and the hydrophobic functional groups and hydrophilic fermentation inhibitors in the hydrolysate, most hydrophilic fermentation inhibitors can be removed, and the content of straw dilute acid hydrolysis byproducts can be reduced.

The invention discloses a modification method for strengthening and toughening polylactic acid. Sulfonated polystyrene ionomers containing sulfonated rigid segments and thermoplastic elastic flexiblesegments are blended by melting with the polylactic acid to modify the polylactic acid material and achieve the effects of strengthening and toughening. The sulfonated polystyrene ionomers are obtained by sulfonating polystyrene segments of polystyrene block copolymers such as poly (styrene-butadiene-styrene) (SEBS) and the like to different degrees, and the flexible segments play a role in toughening the polylactic acid composite material.

The invention is suitable for the fields of data processing and transmission, and provides a method and a system for modifying files stored in electronic terminals. The method comprises the following steps that: a first electronic terminal receives and stores a file which is to be processed and sent by a second electronic terminal through a wireless network, wherein the file is stored in a preset storage region of the first electronic terminal; the first electronic terminal modifies the file in the storage region, converts a modification instruction into a universal instruction, and sends the universal instruction to the second electronic terminal; and the second electronic terminal receives the universal instruction and correspondingly modifies the locally stored file according to the universal instruction. According to the embodiment of the invention, the file which is to be processed and sent by the second electronic terminal is copied to the first electronic terminal, and the second electronic terminal modifies the locally stored file according to a file operation instruction from the first electronic terminal, so that the aim that the second electronic terminal modifies the local file is fulfilled.

The invention discloses a cobalt salt bonding agent for bonding nitrile butadiene rubber with a bare steel framework and a preparation method thereof, the bonding agent consists of a composite bonding agent, phenolic resin and auxiliaries, the composite bonding agent comprises a main bonding agent and an auxiliary bonding agent, wherein the main bonding agent comprises cobalt boroacylate and cobalt neocaprate, the auxiliary bonding agent is a composite organic salt containing vanadium, nickel and cerium, the phenolic resin comprises a methylene donor and a methylene acceptor, and the auxiliaries comprise a toughener, an activating agent, a vulcanizing activator, a silane coupling agent and a vulcanizing agent; and the cobalt salt bonding agent for bonding the nitrile butadiene rubber with the bare steel framework is obtained by dispersing the composite bonding agent in a phenolic resin carrier, using the auxiliaries for matching and dissolving in mixed solvent for preparing rubber slurry. The cobalt salt bonding agent has the advantages of good thermal stability, good dynamic mechanical properties, capability of being directly coated for use and low cost, and is applicable to high-strength bonding mixed rubber of the nitrile butadiene rubber and regenerated rubber or regenerated rubber powder with material of the bare steel framework.

The invention discloses a cobalt salt bonding agent for bonding ethylene propylene diene monomer with a copper or zinc framework and a preparation method thereof, the bonding agent consists of a composite bonding agent, phenolic resin and auxiliaries, the composite bonding agent comprises a main bonding agent and an auxiliary bonding agent, wherein the main bonding agent comprises cobalt boroacylate and cobalt neocaprate, the auxiliary bonding agent is cerium 2-ethylhexanoate, the phenolic resin comprises a methyl donor and a methyl acceptor, and the auxiliaries comprise a toughener, an activating agent, a vulcanizing activator, a silane coupling agent and a vulcanizing agent; and the cobalt salt bonding agent for bonding the ethylene propylene diene monomer with the copper or zinc framework is obtained by dispersing the composite bonding agent in a phenolic resin carrier, using the auxiliaries for matching and dissolving in mixed solvent for preparing into glue slurry. The cobalt salt bonding agent has the advantages of good thermal stability, good dynamic mechanical properties, direct coating for use and low cost, and is applicable to high-strength bonding the ethylene propylene diene monomer including mixed rubber of the ethylene propylene diene monomer, natural rubber and reclaimed rubber or reclaimed rubber powder with the copper, zinc, copper alloy, zinc alloy, zinc-plated and brass-plated frameworks.

The invention relates to an asphalt mixing material performance enhancing agent and a preparation method thereof, and belongs to the technical field of road materials. The asphalt mixing material performance enhancing agent is composed of rock asphalt and an extra additive. The mass ratio of the rock asphalt to the extra additive is larger than 9:1. The invention further provides the preparation method of the asphalt mixing material performance enhancing agent. The asphalt mixing material performance enhancing agent can be easily molten and distributed into an asphalt mixing material, the efficacy of improving performance of the asphalt mixing material can be brought into full play, the high-temperature stable performance is kept, and meanwhile the better water stability and low-temperature anti-cracking performance are achieved.

The invention relates to the technical field of bottom mud dredging, and discloses environment-friendly dredging and curing modification integrated equipment for bottom mud dredging, wherein the equipment comprises a sand-water separator; with a cutter suction dredging vessel, bottom mud dredging is achieved under the condition of not constructing a cofferdam, disturbance of traditional water conservancy dredging to natural water is avoided, and release of pollutants in bottom mud to non-flowing water is limited; the environment quality of a water body is comprehensively improved to the maximum extent through ex-situ treatment of the pollutants in water body sediments, according to the technological process of solidification modification treatment and resource utilization of the dredged bottom mud, firstly, impurities in the bottom mud are separated through a vibrating screen so as to protect follow-up treatment equipment; secondly, an organic conditioner is added to improve the water holding performance of the bottom mud, and bottom mud concentration and reduction and enhancement of water holding are achieved; and finally, a dehydration curing agent is added into the concentrated bottom mud, dehydrating and drying are achieved by using mechanical filter pressing equipment, and a dried mud cake is transported outwards for resource utilization.

The invention relates to the field of polyurethane modified resin type organic silicon softener emulsion for finishing hand feeling styles of various textiles, and discloses comb-shaped associative polyurethane composite modified organic silicon softener emulsion and a preparation method thereof. The method comprises the following steps: preparing raw materials; performing prepolymerization; and carrying out chain extension and mixing emulsification. The softener emulsion disclosed by the invention is novel in structure and remarkable in effect. Various macromolecules in the emulsion can be effectively associated with each other, and blending modification of a traditional organic silicon softener is realized on textile fibers in a molecular blending manner. The self-made polyurethane modified polysiloxane polymer main chain has better extensibility, and polysiloxane long chains and polyether long chains are distributed in the side direction of the self-made polyurethane modified polysiloxane polymer main chain in an echelon manner; compared with a traditional amino modified organic silicon softener, the product provided by the invention can endow various textiles with obviously better hydrophilicity and elastic hand feeling; and the product is low in emulsifier content, safe, environmentally friendly and convenient to use, and has a good market prospect.

The invention belongs to the technical field of new materials, and provides a new wear-resistant tire material and a preparation method thereof. The wear-resistant tire comprises the following raw materials in parts by weight: 50-85 parts of natural rubber, 12-28 parts of chlorohydrin rubber, 8-12 parts of alkali-free glass fiber, 8-23 parts of silicon dioxide, 7-21 parts of carbon black, 1-8 parts of stearic acid, 2-18 parts of octyl oleate, 1-9 parts of magnesium salt whisker, N 2-12 parts of tert-butyl-2-benzothiazole sulfonamide, 0.08-0.23 parts of silane coupling agent, 1-3 parts of protective wax, 0.1-1.9 parts of leveling agent, the crystals of the magnesium salt whiskers The whisker diameter is less than 1 μm, the alkali-free glass fiber is chopped fiber, and the leveling agent includes the following raw materials in parts by weight: 30-40 parts of sodium urealate polymer, 12-15 parts of hexamethylenetetramine, Sodium chloride 1.8-2.5 parts. The above-mentioned raw materials are kneaded and heated to form new tire materials, and the Acron wear is between 0.18-0.24cm3, achieving the effect of improving wear resistance.

The invention discloses niobium-modified active aluminum oxide for formaldehyde purifying as well as a preparation method and application thereof. Active aluminum oxide is put into a niobium salt solution with certain concentration, a proper amount of hydrochloric acid is added, and suction filtration is performed after ultrasonic processing is performed for 5-12 hours; and an obtained sample is used after being separately treated by two temperatures. The active aluminum oxide treated by low-concentration niobium salt with niobium concentration being greater than 0 and smaller than or equal to 0.012 mol / L is put into a drying oven of 50 DEG C to be dried for 12 hours, and then is applied to formaldehyde purifying; and the active aluminum oxide treated by high-concentration niobium salt with niobium concentration being greater than 0.012 mol / L and smaller than or equal to 0.020 mol / L is put into into the drying oven of 50 DEG C to be dried for 12 hours, and is roasted under air atmosphere for 4-5 hours at a roasting temperature of 400-500 DEG C. The preparation method disclosed by the invention can be suitable for modifying of the active aluminum oxide and molecular sieve, can improve performance to be 2-5 times of those of an unprocessed sample; and the niobium-modified active aluminum oxide is not liable to desorption when environmental condition changes, so that secondary pollution is avoided.

The invention relates to the technical field of bottom mud dredging, and discloses a dredged bottom mud solidification modification method, which comprises the following steps: sludge enters a grit chamber after garbage sorting, sand and stone separation is carried out in the grit chamber, and substances with low ash content and high carbon content are added into the grit chamber, so that the adsorption performance of a sludge derived adsorbent is improved, and heavy metal ions are adsorbed. Separated sand stone is settled and then is dug at regular intervals, then interstitial water in the sludge is separated out through a gravity concentration method under the natural gravity settling effect, and the water content of the sludge is reduced. Through concentrating, the solid content of sludge is improved, subsequent treatment is facilitated, the sludge conveyed from a concentration tank is received by a sludge conditioning device, a curing agent is added, the dehydration performance is improved, the activity of pollutants is reduced, and the leaching rate of heavy metals is reduced, so that the purpose of sludge modification is achieved. Then, the conditioned sludge is pumped into a squeezer through a squeezing feed pump, the sludge is dehydrated into a sludge cake with the water content of less than 50%, and the dehydrated sludge cake is transported out for resource utilization.

The invention discloses a cobalt salt adhesive for the adhesion of acrylonitrile-butadiene rubber and bare steel skeletons and a preparation method thereof; the adhesive comprises a composite adhesive, rubber, and an additive; the composite adhesive, which comprises a main adhesive and an auxiliary adhesive, is the A component, wherein the main adhesive comprises cobalt boracylate and cobalt neodecanoate, and the auxiliary adhesive is 2-ethylcaproate containing vanadium and cerium; the rubber is acrylonitrile-butadiene rubber; the additive comprises an antioxidant, a plasticizer, a reinforcing agent, a promoter, an activator, and a vulcanizing agent; the A component is dispersed in a acrylonitrile-butadiene rubber carrier, and is combined with the additive to forms an adhesive mother rubber B; the adhesive mother rubber B is dissolved by a solvent of ethyl acetate to prepare rubber slurry so as to obtain the cobalt salt adhesive for the adhesion of acrylonitrile-butadiene rubber and bare steel skeletons. The cobalt salt adhesive of the invention has the advantages of good heat stability, good dynamic mechanical properties, direct coating application, and low cost, and is applicable to the high-strength adhesion of acrylonitrile-butadiene rubber and bare steel skeleton materials.

The embodiment of the invention discloses a data processing method applied to a board game data processing system. The system comprises chess pieces and a plurality of chessboard units, wherein readable attribute information is set in the chess pieces; and readable chessboard attribute information is set in the chessboard units. The method comprises the following steps of: reading the attribute information of the chess pieces and the attribute information of the chessboard units of the chess pieces; converting the attribute information into control signals, and sending the control signals; displaying animation modes corresponding to the received attribute information according to the preset corresponding relationship between the control signals and the animation modes; modifying the attribute information of the chess pieces according to the preset corresponding relationship between the attribute information of the chess pieces and the attribute information of the chessboard units; and storing the modified attribute information of the chess pieces. According to the data processing method applied to the game system, the purpose of modifying the attributes of the chess pieces according to the terrain attribute information of a chessboard is fulfilled, the attribute values of the chess pieces are variable, and the game process is more interesting.

The invention discloses a high-strength and high-perviousness filtering cloth material. The filtering cloth material is prepared from the following raw materials in parts by weight: polyethylene, polypropylene, polyvinylpyrrolidone, carbon nanotube, polyethylene glycol, carbon fiber, modified polyethylene acrylate, ionic modified clay, surface modifying agent, thermoplastic polyurethane, anti-ageing agent and lubricating agent. The high-strength and high-perviousness filtering cloth material disclosed by the invention has the beneficial effects that by scientific proportioning of all the materials and components, under the synergistic effect of all the components, the strength and the perviousness of the filtering cloth material are improved, so that the filtering cloth material can be applicable to the condition of rapid filtration and has a wide application range; meanwhile, by the comprehensive effect of the ionic modified clay, the surface properties of the polyethylene and the polypropylene are improved, and the filtering effect is improved; due to addition of the modified polyethylene acrylate and the thermoplastic polyurethane, the filtering effect of the filtering cloth material is further improved, and the filtering capability of the filtering cloth is improved, so that the high-strength and high-perviousness filtering cloth material has great promotion value.

The invention discloses a multi-mixed composite salt monomer and multi-element polybenzodiazole liquid crystal polymer with antioxidant stability and preparation and application of the multi-mixed composite salt monomer and multielement polybenzodiazole liquid crystal polymer. The structure of the multi-mixed composite salt monomer is shown as a formula I, a formula II or a formula III. The invention further discloses a preparation method of the multi-mixed composite salt monomer, application of the multi-mixed composite salt monomer in preparation of the multi-element polybenzodiazole liquidcrystal polymer and the fiber thereof through self-polycondensation, the multi-element polybenzodiazole liquid crystal polymer obtained according to the multi-element polybenzodiazole liquid crystal polymer and the fiber thereof, and the structure of the multi-element polybenzodiazole liquid crystal polymer is shown as a formula V, VI or VII. The multi-mixed composite salt monomer integrates the structure and potential performance of a material, has excellent oxidation resistance stability, can effectively solve the comprehensive performance of the material when being applied to self-polycondensation preparation of modified PBO composite fibers, and has the advantages of high polymerization speed, unique fiber solidification equipment and process, high productivity, convenience in operation, low cost and the like.