6301 results about "Ammonium persulfate" patented technology

The invention discloses a preparation method for sodium alginate-acrylamide-based hydrogel. The preparation method comprises the following steps of: dissolving sodium alginate powder in deionized water; then sequentially adding an acrylamide monomer, a methylene diacrylamide cross-linking agent, ammonium persulfate and an N,N,N',N'-tetramethylethylenediamine catalyst; uniformly stirring the materials, pouring the mixture into a glass die, and heating the mixture to obtain a hydrogel; completely soaking the hydrogel in a 0.01-1 mol / L non-monovalent cation aqueous solution for 1-10 hours, wherein cations diffuse and enter in a hydrogel network structure, and induce sodium alginate to cross-link, so as to generate the high-strength and high-toughness sodium alginate-acrylamide-based hydrogel during the process. The hydrogel disclosed by the invention has the following performances: the highest tensile strength can achieve 1 MPa, and the highest tensile elasticity modulus can achieve 250 KPa; a loading-unloading test is performed on the hydrogel, and when the great tensile multiple before unloading is 8, the highest dissipated energy can achieve 2180 KJ / m<3>.

The invention relates to a stable curing agent of repairing heavy metal and toxic organic matter combined polluted soil. The stable curing agent comprises the following raw materials in percentage by weight: 10-30% of cement, 10-30% of coal ash, 20-50% of clays, 2-10% of an activating agent and 2-20% of an oxidizing agent, wherein the activating agent is a composition of one or more than two of magnesium oxide, aluminum oxide, titanium dioxide or molybdenum trioxide, and the oxidizing agent is a composition of one or more than two of sodium persulfate, calcium peroxide, potassium persulfate and ammonium persulfate. The raw materials are put into a grinder to be uniformly grinded and mixed to prepare the stable curing agent with the specific surface area of 400-800 / kg. The stable curing agent provided by the invention has the characteristics of low cost, good soil repairing effect and simplicity in construction.

The invention relates to high temperature resistant amphoteric ion polymer fluid loss agent used for drilling fluid of a high temperature and high pressure drilling and a preparation method thereof. Four monomers, namely, acrylamide (AM), 2-acrylamide-2-methyl propane sulfonic acid (AMPS), dimethyl diallylammonium chloride (DMDAAC) and styrenesulfonate (SSS) are used as raw materials, wherein the mole ratio of AM:AMPS:DMDAAC:SSS is (9-11):(3-4):(0.5-1.5):(1.0-1.5); ammoniumpersulfate-sodium bisulfite as an initiator is added and solution is copolymerized through a polymerization method to compose the fluid loss agent. The fluid loss agent provided by the invention has the advantages of ideal high temperature resistant (more than 220 DEG C) reducing filtrate performance, shale inhibition performance and stable fluid rheology performance and simple preparation method, convenient operation and higher yield.

The present invention relates to the preparation of nano material. One-dimensional monocrystalline nano manganese dioxide wire of different crystal form is synthesized selectively via controlling thetemperature, period and material control of the hydrothermal reaction of two-valent manganese salt and ammohnium persulfate as raw material and ammonium sulfate as additive at 100-220 deg.c inside one sealed reactor. The process may be widely used in basic theory research in lithium ion cell, molecular sieve and relevant fields.

The present invention relates to methods of treating subterranean formations with viscosified aqueous well treating compositions which break into thin fluids at static temperatures in the range of from about 150° F. to about 200° F. A breaker system is included in the compositions comprised of an alkali metal or ammonium persulfate breaker and a breaker activity delaying agent comprised of an alkali metal chlorite or hypochlorite.

The invention discloses a fully synthetic cutting fluid which comprises anion active agent, non-ionic surface active agent, polyethylene glycol, borax, bactericide, foam suppressor, pH regulator, water and additive; wherein, the additive is prepared by the following method: the surface active agents are dissolved by acetone, the mixed solution is added with toluene and heated up to 50-60 DEG C, and the reaction system is dripped with acrylate monomer as well as azodiisobutyronitrile (AIBN) or ammonium persulfate (APS) evocating agent; after that, the temperature is preserved for 3-5h, the reaction stops, and organic solvent is removed, so that the additive is obtained. Compared with the existing fully synthetic cutting fluid, the fully synthetic cutting fluid of the invention can completely inhibit leaching of cobalt element in hard alloy containing cobalt when metal is processed, well solves the problem of separating the cobalt in the existing fully synthetic cutting fluid, and is environment-friendly and efficient.

The invention discloses postoperation anti-adhesion hydrogel and a preparing method thereof. The hydrogel is prepared from sodium alginate powder, chitosan powder, acrylamide monomers, N,N'-methylene bisacrylamide, calcium sulfate, ammonium persulfate and N,N,N',N'-tetramethylethylenediamine. The preparing method of the high-strength high-tenacity chitosan and sodium alginate compound hydrogel is easy to operate, parameters are controllable, the materials are easy to obtain, and the solvent is nontoxic or low in toxicity and safe to treat and use; the method integrates advantages of the two natural biological materials, and the requirement for postoperation adhesion prevention of patients and the requirement for nursing care and treatment of medical workers can be met well. The hydrogel is soft, can be attached to the skin easily, has good flexibility and can effectively prevent wound surface adhesion and be degraded and absorbed, secondary trauma is avoided, and the hydrogel is expected to become a novel postoperation anti-adhesion material.

The invention provides a preparation method of a flexible polyaniline conductive composite hydrogel material, and belongs to the technical field of functional polymer materials. According to the method, a flexible conductive material with good mechanical strength and electrochemical property is prepared by utilizing the properties and characteristics of polyatomic acid of phytic acid, by taking the phytic acid as an acid doping agent and a gel crosslinking factor and taking polyvinyl alcohol hydrogel as a skeleton. The method comprises the following steps: dissolving polyvinyl alcohol into water to form a solution and matching the solution with phenylamine and phytic acid at a proportion to form a solution A; dissolving initiating agent ammonium persulfate into water to form a solution B; quickly mixing the solution A and the solution B at a low temperature, so that in situ polymerization is performed on the phenylamine in a polyvinyl alcohol aqueous solution, so as to form phytic acid-doped polyaniline hydrogel; placing the phytic acid-doped polyaniline hydrogel into a refrigerator for freezing, so as to form the flexible polyaniline conductive composite hydrogel material by a cyclic freeze thawing. The flexible polyaniline conductive composite hydrogel material prepared by the method has good electrochemical property, mechanical strength and flexibility; the preparation method is simple, and the cost is low, and the preparation method has wide application prospect in the fields of flexible energy storage materials and biomedicine.

The invention relates to a preparation method of a modified activated carbon adsorption desulfurizing agent. Cocoa nut activated charcoal serves as a carrier; oxidant, such as concentrated nitric acid, concentrated sulfuric acid or ammonium sulphate and the like, is added for modification; active components, such as copper, silver, nipple, cerium and the like are loaded; the metallic oxide content of active components accounts for 1-20 wt% of activated carbon; the mixture is dried to obtain desulfurizing agent. Compared with the prior art, the preparation method has the characteristics of large sulfur adsorption capacity, high desulfurization precision, convenient reproduction and the like, and can be widely applied to producing ultra clean fuel oil in the petrochemical industry field.

The invention discloses an environmental-friendly white emulsion. The environmental-friendly white emulsion is prepared from the components in percentage by weight: 1.8-2.5 percent of polyvinyl alcohol PVA, 23-27 percent of vinyl acetate VAC, 0.3-0.8 percent of acrylic acid AA, 0.8-1.5 percent of acryl amide AM, 0.1-0.15 percent of ammonium persulfate, an anionic emulsifier A-102, alkyl polyoxyethylene ether LCN-287, a nonionic emulsifier, 5-7 percent of corn starch, a transparent powder, a plasticizer, 2.5-4 percent of diethylene glycol dibenzoate, 0.2-0.3 percent of preservative KSG-201, 0.1-0.2 percent of sodium hydroxide NaOH, 0.3-0.5 percent of methanol, 3-6 percent of functional filler, 0.15-0.3 percent of compound emulsifier and 56-58 percent of water. The environmental-friendly white emulsion is strong in the adhesive force and the adhesive strength, is low in the production cost and is good in the environmental protection performance.

The invention discloses a system and a method for desulfurizing, denitrifying and removing mercury based on photoactivation ammonium persulfate. The system is mainly provided with a boiler or kiln, a deduster, a flue gas temperature regulator, a photochemistry reactor, a liquid spraying system as well as a byproduct post-processing system. Flue gas discharged from the boiler or kiln enters the photochemistry reactor arranged on a flue channel after being subjected to dedusting and temperature regulation, and an ammonium persulfate solution from the liquid spraying system is sprayed into the photochemistry reactor in a mist form; an UV (ultraviolet) lamp in the photochemistry reactor emits UV light to perform catalytic decomposition on ammonium persulfate, releases sulfate radical free radicals with high oxidizing property (SO4-.), and meanwhile oxidizes and removes SO2, NOx and mercury in the flue gas. Oxidized products are subjected to resource utilization after being processed by the byproduct post-processing system. The method has the prominent advantages that the method can be used for removing multiple pollutants in coal burned flue gas synchronously, has no secondary pollution during removing, and can be used for transforming aging units and the like, and the system is a novel flue gas purifying system with a wide application prospect.

The invention discloses a preparation method for an iron-nitrogen co-doped porous carbon sphere material. The preparation method comprises the following steps: by taking 2-aminopyridine as a monomer and taking ammonium persulfate and ferric chloride as oxidants, performing in-situ polymerization reaction in a duct of a porous silicon dioxide template to obtain a precursor; performing high-temperature carbonization treatment on the precursor in a tubular furnace and an inert gas nitrogen-gas environment; and removing the silicon dioxide template by hydrofluoric acid to obtain the iron-nitrogen co-doped porous carbon sphere material which is taken as an electric catalyst to achieve good catalytic effect in oxygen gas reduction reaction. The preparation method has the advantages that the process is simple and easy to perform and the raw materials are cheap. The prepared carbon material contains a three-dimensional communicated pore structure, has a high specific surface area and a large pore volume, can effectively improve the electric catalytic activity through the heteroatom nitrogen-iron doping, has relatively high electric catalytic efficiency while being applied as a low-price electric catalyst, and has an important value and significance in the fields of doped type porous carbon material preparation and proton membrane fuel battery electric catalysis.

The invention discloses a binder and making method of modified urea-formaldehyde resin, which comprises the following steps: adopting urea-formaldehyde resin, fill, reinforcer, deoxidation agent, formaldehyde catching agent, anti-aging agent, anti-shrinking agent, hardener and auxiliary reinforcer; adopting modified copolymer of acrylic acid, sodium acrylate, N, N-dimethylamino propyl methyl acrylamide as anti-shrinking agent; making polyacrylamide solution reacted by acrylamide and ammonium persulphate as formaldehyde catching agent; allocating each component according to proportion; blending evenly; casting; extracting into vacuum; stripping; stewing; drying naturally; coating a layer of polymethacrylate paint on the surface of product; proceeding colorful paint; obtaining the product.

The invention relates to the technical field of synthesizing of graphene materials and provides a preparation method of nitrogen-doped graphene. The preparation method includes: using an improved Hummers method to prepare continuous large-piece graphene oxide; using a hydrothermal method to prepare the graphene oxide into graphene of a porous three-dimensional structure; ultrasonically dispersing the graphene of the porous three-dimensional structure into an acid solution with the pH being 1-5, adding aniline, well mixing, adding ammonium persulfate, well mixing, and transferring the obtained mixed liquid into a teflon container for hydrothermal reaction so as to obtain a porous three-dimensional graphene-polyaniline compound; performing high-temperature treatment under nitrogen protection to allow polyaniline to decompose out nitrogen sources so as to obtain the nitrogen-doped porous three-dimensional graphene. The method has the advantages that the nitrogen-doped graphene with high nitrogen content can be prepared, the structure of the three-dimensional graphene can be kept, the obtained nitrogen-doped porous three-dimensional graphene is good in electrochemical performance and quite suitable for being used for producing a super capacitor, and the method is convenient to operate and beneficial to industrial popularization.

The invention relates to a preparation method of a foamed porous graphene / polypyrrole composite oil absorption material, belonging to the technical fields of environmental protection and composite materials. The method is characterized by comprising the following steps: carrying out KH570 functionalization on graphite oxide prepared from graphite; carrying out ultrasonic treatment on the functionalized graphite oxide product to obtain a graphene oxide aqueous solution with a certain concentration, adding certain amounts of pyrrole, styrene or butyl methacrylate or lauryl methacrylate and an initiator (ammonium persulfate or potassium persulfate); carrying out thermostatic reaction in a hydrothermal reaction kettle for 10 hours, thereby obtaining a black solid; and carrying out freeze-drying on the black solid to obtain the foamed porous graphene / polypyrrole composite oil absorption material in a three-dimensional structure. The graphene / polypyrrole composite oil absorption material ina three-dimensional structure is prepared by a chemical process, so the material has hydrophobicity and large specific area of the graphene, can contain abundant oil molecules, and has high oil adsorbability. The preparation method is simple to operate, and has the advantage of mild reaction conditions.

The invention provides a method for preparing magnetic ferroferric oxide / conductive polyaniline light-weight composite hollow microspheres, which relates to a method for preparing a magnetic ferroferric oxide / conductive polyaniline composite material. The invention solves the problems of high density and easy agglomeration of the traditional magnetic nanometer particle / conductive polymer composite material. The method comprises the following steps of: regulating ferrous chloride and ferric chloride solutions to be alkaline, adding sodium dodecyl benzene sulfonate and reacting to obtain ferroferric oxide; and modifying hollow glass microspheres by using poly(diallyldimethylammonium chloride) solutions after alkaline cleaning, then reacting the hollow glass microspheres with the ferroferric oxide, sequentially immersing obtained solid particles by using the poly(diallyldimethylammonium chloride) solutions and polystyrene sulfonic acid solutions, then adding the solid particles to aniline solutions, initiating polymerization by using ammonium persulfate, and washing and drying the solid particles to obtain the composite hollow microspheres. The composite hollow microspheres have both conductivity and magnetism, the density is 0.78-0.8g / cm<3>, and the composite hollow microspheres are not easy to agglomerate and are used for fields of military equipment stealth technology and civil anti-electromagnetic radiation.

The invention discloses a preparation method of two-dimensional nano-graphene. The method includes: mixing acrylic acid and water according to the volume ratio of 1:1-1:2, adding hydrotalcite particles passing a sieve 20-50 in mesh into acrylic acid solution according to the quantity that each gram of hydrotalcite corresponds to 3-5mmol of the acrylic acid, stirring at the temperature of 60-70 DEG C, ageing, separating particles, adding the particles into isopropanol solution, adding ammonium persulfate, heating to 60-90 DEG C for reaction for 8-10h, drying at the temperature of 70-90 DEG C, grinding, and passing a sieve 20-40 in mesh to obtain powder; heating the power to 600-700 DEG C in vacuum, calcining for 2-4h, adding calcined powder into hydrochloric acid solution 20%-40% in concentration, stirring under the protection of nitrogen, precipitating, separating and drying; and heating an obtained product to 2000-2500 DEG C in vacuum, subjecting the product to heat treatment for 3-6h and cooling so that the two-dimensional nano-graphene is obtained. The method is simple in material sources and simple and mild in process.

A method for preparing polymer for PAN precursor, by copolymerizing the water phase suspend using ammonium persulphate-ammonium sulfite or ammonium bisulfite as a primosome, is disclosed. The polyacrylonitrile powder material is obtained by adding the first monomer acrylonitrile, the second monomer crylic acid, methyl acrylate or acrylamide, and the third itaconic acid, or the first monomer crylic acid, the second monomer methyl acrylate or itaconic acid, and inorganic oxidation-reduction primosome without any metallic ion which comprises ammonium persulphate, ammonium sulfite or ammonium bisulfite and acidified deionized water into the polymerization kettle in defined proportions, controlling the temperature and stirring to react for a time, and discharging by removing the residual monomer, washing and drying. The average molecular weight is from 17.5 myriads to 26.1 myriads, and the distribution index of molecular weight is from 2.70 to 2.91; the intension of polyacrylonitrile precursor tested by spinning sample is from 4.58 to 6.61 CN / dtex; and the carbon fiber strength is 3.61-5.06MPa.

The invention belongs to the technical field of soil remediation, and in particular relates to a soil remediation agent for treating heavy metal pollution and a production method of the soil remediation agent. The soil remediation agent consists of the following raw materials in percentage by weight: 35 to 65 percent of active molasses yeast waste water chelate powder, 5 to 20 percent of silicon dioxide, 5 to 15 percent of calcium oxide, 1 to 10 percent of magnesium oxide, 0.3 to 10 percent of ammonium persulfate, 5 to 28 percent of humic acid and derivatives thereof, 0.1 to 15 percent of microcapsule inoculants, 0.1 to 5 percent of a macromolecular water-retaining agent, 0.1 to 5 percent of a heavy metal passivant, 1 to 5 percent of auxiliary agents and 1 to 45 percent of inorganic mixed fertilizer. Compared with the prior art, the soil remediation agent provided by the invention has the advantages that the organic waste liquid of yeast industry serves as one of the main raw material, so the environmental pollution caused by the organic waste liquid is reduced and the cost of the soil remediation agent is reduced; precipitation and biological action are combined, so a good effect of treating the heavy metal pollution is achieved; the main components also comprise organic fertilizer and inorganic fertilizer, so the heavy metal pollution can be effectively treated, production and income of crops are increased, continuous cropping resistance of the crops is achieved, and potential application and popularization values are achieved.

An etchant for a metal is described. In one example, the etchant includes ammonium persulfate ((NH4)2S2O8), an azole compound and water. The etchant does not include hydrogen peroxide. Thus, the etchant may etch a metal layer including copper so that an etched copper layer has a tapered profile. Furthermore, the etchant may have a high stability to maintain etching ability for a longer time. Thus, manufacturing margins may be improved so that manufacturing costs may be reduced.

The invention relates to a preparation method for an acrylic resin / graphene oxide nanometer composite leather finishing agent. In the preparation method, a nanometer graphene oxide suspension liquid is formed through peeling and dispersing; and then the acrylic resin / graphene oxide nanometer composite acrylic resin finishing agent is prepared through in-situ polymerization. The preparation methodcomprises the following specific steps: carrying out oxidization and ultrasonic stripping on natural graphite powder to prepare graphene oxide; adding graphene oxide to a mixed monomer of methyl acrylate, ethyl acrylate, butyl acrylate, acrylic acid and hydroxyethyl acrylate under the action of ultrasonic waves; and carrying out in-situ free radical copolymerization reaction under the action of an initiator ammonium persulfate to obtain the acrylic resin / graphene oxide nanometer composite leather finishing agent. The preparation method has the characteristics that the acrylic resin / graphene oxide nanometer composite leather finishing agent with excellent film-forming hand feel, strength and anti-static performances and no heat bonding and cold brittleness defects is prepared by using the specific laminated structure and performance of graphene oxide.

The invention discloses a preparation method of absorbent polymer which is characterized in high speed rate of liquid absorption, good dispersibility and high dry-touch degree. Acrylic acid is added into sodium hydroxide aqueous solution, which is uniformly mixed with acrylamide and then crosslinking agent, and foam stabilizer aqueous solution is added; while being aerated with nitrogen gas, the solution is ordinally added with polymerization initiator azodi (2-amidinopropane hydrochloride) aqueous solution, ammonium persulphate aqueous solution, sodium bisulfite aqueous solution and uniformly mixed; the aeration of nitrogen gas is stopped, and when the temperature of the solution is raised to 35 to 45 DEG C, the solution is added with foamer aqueous solution and uniformly mixed, so that porous gel is obtained; when the temperature is raised to 100 DEG C to 110 DEG C, the porous gel is put in the temperature environment of 80 to 90 DEG C for two the three hours; after being cooled down, the porous gel is taken out of a container, scissored into pieces, dried, crumbled and filtered, and grains are collected; crosslinking treatment agent is sprayed on the surface of grains, and after stirring and heating, the absorbent polymer is obtained. In three minutes, the volume of saline absorbed by the product prepared by the invention can reach 70 ml / gSAP.

The invention relates to a grafted copolymerized cationic polysaccharide bioflocculant and a preparing method thereof. A product with the cationic degree (DC) of 3-63% is finally prepared through an aqueous solution polymerization technology with a present nonionic polysaccharide bioflocculant (Dx) as a raw material, one or more of dimethyl diallyl ammonium chloride (DMDAAC), methacryloxyethyltrimethyl ammonium chloride (DMC), acryloyloxyethyltrimethyl ammonium chloride (DAC), dimethylaminoethyl methacrylate (DMAEMA), dimethylaminoethyl acrylate (DMAEA) as a monomer, and one or two of ammonium persulfate / sodium bisulfate and dibenzoyl peroxide (BPO) (AIBA) as an initiator. The preparation method is simple, and is easy to control, and the product obtained in the invention has good flocculation effect and high treatment efficiency, and can be widely used in the field of treatment various sewages, the sludge dewatering field and the like.

The invention relates to an etchant composition and an etching method, wherein, the etchant composition comprises any two components of oxidants, acid and salt, and the pH value of the etchant composition is between 1 and 7. The oxidant components are selected from hydrogen peroxide, ammonium persulfate, potassium persulfate and ceric ammonium nitrate; the acid components are selected from chloric acid, perchlorate, acetic acid, nitric acid, hydrofluoric acid, sulfuric acid and oxalic acid, and the salt components are selected from ammonium fluoride, ammonium bifluoride, diammonium phosphate, ammonium phosphate, ammonium chloride and perfluorinated octyl sulfanilic acid (C8F17SO3NH4).

The invention discloses a lignosulfonate-polycarboxylic acid copolymerized composite high-performance water reducer and a preparation method thereof. The high-performance water reducer comprises the components in parts by weight: 5-30 parts of lignosulfonate, 20-30 parts of methyl allyl polyethenoxy ether, 2-5 parts of acrylic acid, 1-5 parts of ammonium persulfate, 4-15 parts of sodium hydroxide and water. The preparation method comprise the steps as follows: lignosulfonate, methyl allyl polyethenoxy ether and acrylic acid are directly synthesized under the action of ammonium persulfate, and the mixture is neutralized by sodium hydroxide to obtain the high-performance water reducer. As the high-performance water reducer is made from natural recycled materials, the high-performance water reducer is low in price, stable in performance, high in water-reducing rate, good in collapse prevention property, remarkable in improved effect, and is unlikely to bleed, separate and deposit after concrete is added, the quality problems of sand leakage, honeycomb-like phenomenon and leakage due to cracking in the middle and low-strength concretes are effectively avoided, and the safety performance is improved.

The invention discloses anticorrosive paint and a preparation method thereof. The method comprises the steps that a polymer monomer is dispersed into an organic acid water solution, an oxidized graphene water solution is added, stirring and ultrasonic treatment are performed, then ammonium persulphate is added continuously, filtering is performed after stirring is performed for 6-18 h, a filtered product is washed with water and washed with alcohol repeatedly till the cleanout fluid is neutral, and precursor powder is obtained after drying is performed; 2, the precursor powder, pigment, epoxy resin, a curing agent and water are mixed to obtain a sizing agent, and stirring is performed to obtain a suspension, so that the anticorrosive paint is obtained. According to the anticorrosive paint and the preparation method thereof, on the basis of conducting polymer intercalation oxidized graphene, the nanometer environment-friendly coating material with the water-soluble conducting polymer-sheet material of the sandwich structure as the body material is obtained, and the organic content is greatly lowered.

The present invention relates to conductive fiber preparing process and product. The preparation process includes the following steps: 1. pre-treating base fiber of polyester, viscose or wool successively with acetone, ethanol and distilled water under room temperature condition; 2. compounding fiber treating liquid with oxidant ferric trichloride or ammonium persulfate 2-32 wt%, dopant ammonium cetyl trimethyl bromide or hydrochloric acid 0.1-7 wt% and distilled water; and soaking the base fiber inside the fiber treating liquid for 30 min; and 3. making conductive fiber via coating conducting liquid of aniline, pyrrole or thiophene onto the base fiber inside a continuous coating machine of 1-10 m / min speed, washing with hot water at 50-90 deg.c and drying with hot blast at 60 deg.c to obtain the conductive fiber.

The invention relates to a multicomponent copolymerization oil well cement fluid loss additive and a preparation method thereof. The method comprises: 10-120 portions of 2-acrylamide-2-methyl-1-AMPSA, 1-5 portions of acrylic acid and 15-50 portions of deionized water are added, stirred and then added with sodium hydroxide aqueous solution with the mass fraction of 5-10 percent for neutralizing to pH equal to 3-11; then 10 portions of acrylamide, 0.1-1 portion of complexing agent EDTA and 0.01-1 portion of chain transfer agent are added, the chain transfer agent is isopropyl alcohol or sodium benzoate, the temperature is controlled between 30 DEG C and 60 DEG C and N2 is introduced for 30 minutes; 2-10 portions of N-vinyl pyrrolidone and 0.01-0.5 portion of initiator are added, the initiator is potassium persulfate or ammonium persulfate, and the reaction is carried out for 4-12 hours. The solution keeps still for 5 hours at the temperature of 180 DEG C, and is cooled through flowing water after being taken out, without sedimentation or water separating; and the water loss is zero at the temperature of 180 DEG C according to the standards of drilling fluid, and the water loss is 48ml according to the standards of cement.

The invention belonging to the nanometer material field relates to composite material made of carbon nanometer tubes enwrapped by polyaniline and ferroferric oxide and the preparation method thereof. The invention ultrasonically disperses the carbon nanometer tubes in an aqueous solution containing ferric iron ions and ferrous iron ions and obtains carbon nanometer tubes / ferroferric oxide composite material after adding ammonia. After washing and magnetic separation, the carbon nanometer tubes / ferroferric oxide composite material disperses in a mixed liquor containing aniline, phosphoric acid and ammonium persulfate and the composite material of the invention is obtained after agitation. After water and alcohol washing and magnetic separation, finished products are obtained through drying or dispersing in absolute ethyl alcohol. The material which has the functions of electrical conductivity, magnetism, absorption and capability of absorbing and releasing material carrying negative charge in an aqueous solution can be applicable to the fields such as enzyme immobilization, bioactive substance separation, target-oriented medicine preparation, biosensor, environmental protection, etc. The invention which has simple preparation art, low cost and high raw material utilization factor is suitable for volume production.