318results about How to "Modification method is simple" patented technology

The invention discloses a preparation process of modifying ammonium polyphosphate with amino silane coupling agent, relating to the flame-retardant technology in chemical field. The invention provides a surface organic modified technology which can significantly reduce the water-solubility of ammonium polyphosphate, increases the compatibility of ammonium polyphosphate expansion flame-proof macromolecule material and the flame-proof efficiency, aiming to the problems existing the current ammonium polyphosphate flame-retardant that the current ammonium polyphosphate flame-retardant has higher dissolvability in water, and serious mechanical loss after applied on flame-proof plastic. The invention is conducted through two steps that firstly mixing amino silane coupling agent with deionized water according to weight ratio to hydrolyze, and secondly conducting surface organic modifying processing for ammonium polyphosphate (II type) with hydrolyzed amino silane coupling agent, which makes the dissolvability of II type ammonium polyphosphate in water be reduced to 0.43g / 100mL H2O from 1.101g / 100mL H2O, and respectively increases elongation at break and tension strength by 39.4% and 8.0% through applying modified ammonium polyphosphate on expansion flame-proof polypropylene. The modified ammonium polyphosphate can be extensively applied on the expansion flame-proof of polyolefins plastic, textile, lumber, paper and painting.

The invention relates to modified biomass charcoal and a remediation method of heavy metal contaminated soil. The modified biomass charcoal is prepared by the following steps: (1) sieving biomass charcoal, and washing so as to remove surface fly dust and impurities until the pH value of a scrubbing solution is 6.5-7.5; (2) uniformly mixing the biomass charcoal and a phosphoric acid solution according to the mass ratio of 1 to (1.5-2.5), and then soaking at room temperature for 24 hours above, wherein the mass percent concentration of the phosphoric acid solution is 10-40%; and (3) carrying out solid-liquid separation on the soaking solution, and then drying the obtained a solid material, namely the modified biomass charcoal. The modified biomass charcoal is reasonable in design, is simple in technology, and overcomes the technical difficulty for a long time; phosphoric acid is detained in the biomass charcoal in the form of metaphosphoric acid, and especially can form sediment substances together with active heavy metal ions under a water containing condition, thereby intensifying the passivation or fixing effect to the heavy metal ions by the biomass charcoal.

The invention relates to a residual oil hydrogenation catalyst, a preparation method and application thereof. The residual oil hydrogenation catalyst contains modified kaolin; the process for modifying the kaolin mainly comprises the steps of roasting and treating raw kaolin, and then treating the raw kaolin with mixed acid of strong acid and weak acid; and the modified kaolin has larger aperture and proper surface property, and is properly used as a carrier material of the residual oil hydrogenation catalyst. The residual oil hydrogenation catalyst adopts an impregnation method to load active metal components of VIB and VIII families; and the prepared catalyst can be applied in the field of hydrogenation demetallization, hydrogenation desulfurization, hydrogenation conversion, and the like of heavy oil or residual oil, and has good using performance.

The invention provides a method for industrially preparing graphene coated aluminum nanopowders. The method comprises the steps of dissolving graphene in an organic solvent to prepare graphene dispersion liquid; treating the graphene dispersion liquid by vacuum pumping until the vacuum degree exceeds 10<-2>Pa, wherein the weight of graphene is 1 to 99% of the total weight of the graphene dispersion liquid; adding aluminum nanopowders to the graphene dispersion liquid treated by vacuum pumping under inert atmosphere; agitating at the speed of 600 to 3000rpm for 30 to 100 minutes; treating by vacuum pumping until the vacuum degree exceeds 10<-2>Pa so as to obtain a rough product, wherein the weight of the aluminum nanopowders is 1 to 99% of the total weight of the rough product; thermally treating the rough product at high temperature of water so as to coat the aluminum nanopowders with the grahene. With the adoption of the method, the formation of an aluminum oxide passive film on the surface of the aluminum nanopowders can be effectively inhibited; the problem that the surfaces of the aluminum nanopowders are easily oxidized can be solved.

The invention belongs to the technical field of semiconductor photocatalysis and particularly relates to a surface sulfur vacancy defect mode structure-enriched sulfur-indium-zinc (ZnIn2S4) photocatalyst and a preparation method thereof. The preparation method of the surface sulfur vacancy defect mode structure-enriched sulfur-indium-zinc photocatalyst is characterized in that after high-temperature and high-pressure hydrogenation, a large number of sulfur vacancy defect mode structures are formed on the surface of the sulfur-indium-zinc photocatalyst. Compared with unmodified sulfur-indium-zinc photocatalysts, the surface sulfur vacancy defect mode structure-enriched sulfur-indium-zinc photocatalyst has a large number of the sulfur vacancy defect mode structures on the surface, surface sulfur vacancy defects can form photo-generated carrier capturing 'traps', separation of photo-generated charges can be effectively promoted, compounding of photo-generated electron-hole pairs can be reduced, and further the photocatalytic hydrogen production performance is greatly improved. The surface sulfur vacancy defect mode structure-enriched sulfur-indium-zinc photocatalyst and the preparation method thereof provide a new idea and a new way for designing and developing novel efficient visible light catalysts.

The invention belongs to the technical field of biodegradable materials, and discloses a bagasse / cassava starch polylactic acid biodegradable material and a preparation method thereof. The bagasse / cassava starch polylactic acid biodegradable material comprises the following components in percentage by mass: 5-20% of bagasse, 10-40% of cassava starch, 20-60% of polylactic acid, 5-20% of polycaprolactone, 0.5-3% of coupling agent, 0.5-5% of plasticizer, and 1-5% of lubricant and heat stabilizer. The preparation method comprises the following steps: uniformly mixing the components, adding into a double screw extruder, and carrying out extrusion granulation at the extrusion temperature of 80-140 DEG C at the screw speed of 40-100 r / min to obtain the bagasse / cassava starch polylactic acid biodegradable material. The material has favorable biodegradability and mechanical properties, and can be used for preparing daily plastic products.

The invention discloses a preparation method for a hollow porous carbon composite material. The preparation method comprises the following steps that 1, solid phases are self-assembled to synthesize a metal complex; 2, the metal complex is subjected to in-situ thermolysis and carbothermic reduction to synthesize the hollow porous carbon composite material with embedded metal or metal oxide nano-particles. Furthermore, the carbon composite material is modified and reacts with proper acid, the metal or metal oxide nano-particles in the carbon composite material are removed, and then a graded porous carbon composite material is further obtained. According to the preparation method, a simple one-pot solid-phase reaction method is adopted, step-by-step temperature control is carried out, and then the hollow porous carbon composite material with the evenly embedded metal or metal oxide nano-particles is obtained. Various carbon composite materials synthesized through the method have the advantages of being good in charge and discharge capacity stability, high in specific capacity, excellent in rate capability and the like, and can be applied to lithium ion batteries, electrochemical capacitors and new energy fields.

The invention discloses a flexible environment-friendly polyolefin cable material and a preparation method of the flexible environment-friendly polyolefin cable material. The flexible environment-friendly polyolefin cable material is prepared from the following components in following parts by weight: 65 to 85 parts of EVA (ethylene vinyl acetate), 15 to 35 parts of POE (polyolefin elastomer), 70 to 130 parts of inorganic flame retardant agent, 10 to 30 parts of flame retardant adjuvant, 5 to 8 parts of modifier, 8 to 13 parts of compatilizer, 1.5 to 2.5 parts of antioxidant, and 3 to 5 parts of lubricant. A flexible thermoplastic elastomer is used as a matrix resin, and a certain proportion of flame retardant adjuvant is added, so on the premise of not affecting the flame retardant property of the cable material, the adding quantity of the inorganic flame retardant agent is greatly reduced, and then the flexible environment-friendly polyolefin cable material is prepared. The flexible environment-friendly polyolefin cable material has the advantages that the flexibility is high, the mechanical property is high, and the flexible environment-friendly polyolefin cable material is suitable for the industries with higher requirements on the flexibility of cables, such as communication cables and weak current cables.

The invention discloses a preparation method of an ultrafiltration membrane for improving antibacterial property and anti-fouling performance through modified graphene. The preparation method comprises the following steps in sequence: modifying graphene; drying; adding an organic solvent in modified graphene; dispersing and treating uniformly; adding a membrane additive and a membrane material and uniformly mixing, so as to obtain the membrane casting solution; defoaming the membrane casting solution under vacuum; pouring the membrane casting solution on the surface of a dried and flat plate; stably and quickly scrapping through a membrane scraper; and transferring to gel solution, so as to obtain the ultrafiltration membrane. According to the preparation method, the modified graphene is added, so that the antibacterial property of the ultrafiltration membrane is improved, the application value is high, and the capacities of resisting other pollutions are improved to a certain extent; the modified graphene can be uniformly dispersed into the solvent or the membrane casting solution well, so that the contact and the compatibility of the modified graphene and the membrane can be greatly improved, and more benefits are provided for realizing the characteristics of the modified graphene; and the graphene serving as the raw material is convenient to prepare, and the graphene modification method is simple and easy for industrial production and application.

The invention provides a method for improving performance of an ethylene trimerization catalyst. The ethylene trimerization catalyst at least comprises the following catalyst components: a chromium-containing compound a, a pyrrole derivative b, an alkyl aluminum compound c and a chlorinated compound d as a modifier; and three of the catalyst components a, b, c and d are dispersed in an organic solvent and radiated by microwave. The modification method of trimerization catalyst provided by the invention is simple, practical, easy for implement, green and environment-friendly; the catalyst modified by microwave irradiation has high catalytic activity; and purity of an ethylene trimerization reaction product 1-hexene increases substantially.

The invention relates to the field of anode electrocatalysts for PEMFC (Proton Exchange Membrane Fuel Cells) (including direct-methanol fuel cells, direct-formic-acid fuel cells and the like), and provides a high-performance Pd / C catalyst material and a preparation method thereof. The palladium-carbon nanocatalyst is characterized in that a modified high-area carbon is formed by two-step liquid-phase reaction methods, Pd particles are uniformly dispersed on the surface of the high-area carbon through liquid-phase complexing coreduction. The mass ratio activity of the catalyst to the formic acid electro-oxidation at room temperature is larger than 1,800mA / mg<-1>Pd, and the palladium-carbon nanocatalyst can be used in the field of anode catalysts for PEMFCs.

The invention relates to a high-strength, abrasion-resistant, high-absorption, high-sweat-discharge anti-wrinkle and anti-ultraviolet business wear fabric production technology. The technology is characterized in that blended core-spun yarn twine composed of Supercool / long stapled cotton and dacron textured yarn serves as the raw material of the fabric. The production technology includes the steps that coloring agents are added into hydrophilic softener, and sizing and weaving processes are omitted to guarantee that moisture absorbing and quick drying functions of original yarn are not damaged, and hand feel of the fabric is improved through the deoiling and cleaning process, the high-alkali mercerization process and the decatizing process. According to the fabric, original features of dacron fibers are maintained, good moisture absorbing and quick drying functions are developed, and a modification method is simple. Novel environment-friendly modified materials are used, the fabric does not need to be finished through chemical additives and is free of sizing, production procedures are concise, and meanwhile the requirement of environment protection is met.

The invention discloses a hyperbranched polymer-modified polymer film, and a production method and an application thereof, and belongs to the field of modified polymer films having an antifouling property. In order to overcome the disadvantage of a series of temporary or permanent pollution of proteins, oils and other pollutants to polymer films in the prior art due to low surface energy, a specially-structured hyperbranched polymer is prepared through benzyl group protection and deprotection by starting with an initiator, and plant polyphenols are used to graft the film of a polymer film withthe specially-structured hyperbranched polymer in order to produce the hyperbranched polymer-modified polymer film. The hyperbranched polymer-modified polymer film has the advantages of remarkable antipollution and antibiosis property, improved hydrophilicity, and excellent application prospect in the field of sewage treatment. An easily-operated, strong-universal and effective way is opened up for the modification of polymer films under mild conditions.

The invention discloses a preparation method of a modified metal-organic framework and a composite nano-filtration membrane. The preparation method of the modified metal-organic framework includes thesteps: modifying the surface of the metal-organic framework by the aid of plant polyphenol; forming a hollow structure in the metal-organic framework to obtain the modified metal-organic framework. The preparation method of the composite nano-filtration membrane containing the modified metal-organic framework includes the steps: loading the metal-organic framework into an aromatic polymer function surface layer of a porous supporting membrane by an interfacial polymerization method in situ to obtain the composite nano-filtration membrane. The modified metal-organic framework in the compositenano-filtration membrane is effectively loaded on the membrane and interacted with a surface layer polymer through a chemical bond, water flux, hydrophilcity and pollution resistance of the compositemembrane are improved, and structure stability and chlorine resistance of the composite nano-filtration membrane can be improved. The preparation method is simple and low in production cost and has good industrial production bases and wide application prospects, and the comprehensive performance of the membrane is remarkably improved.

An modified Ca-base adsorbent for cleaning the fume of garbage incinerator by removing the acidic gas, heavy metal, dioxin, etc from it is prepared from industrial light calcium carbonate (CaCO3) and Na salt as modifier through proportionally immersing the powder of light calcium carbonate in the solution of Na salt, heating while stirring, and calcining.

The invention relates to the production process of the fiber used for high-strength and low-extension polypropylene rope, which is mainly applied in the aspects of preparing high-strength ropes, project reinforcement, etc. The invention is a high-strength and low-extension modified polypropylene fiber, comprising interpolymer modified from polypropylene raw material, the adjusting screw of a twin screw extruding machine, the length-diameter ratio of which is increased, a mixing device added at the plasticizing section of the screw and a high pressure spray; after having been sprayed under high pressure, shockchilling is carried out immediately to enhance the monofilament crystallinity of the fiber; a high-temperature oil bath stretching leads the fiber molecular chain to be extended in symmetrical arrangement; a high-temperature steam stretching leads the polypropylene fiber molecular chain to be stretched fully and arranged evenly with high-strength and low-extension; the synnema of a multifilament twisting is encircled as the product fiber. The total denier of the gained high-strength and low-extension polypropylene twisting fiber of the invention is of 5000 deniers to 30000 deniers differently, the fiber strength is 8g / denier to 15 g / denier, and the fiber extensibility is 5% to 8%.

The present invention is one kind of ionic liquid catalyst for produce alkylated oil and its preparation process. The catalyst is ionic liquid modified with sulfur or oxygen containing organic compound, benzene or alkyl derivative of benzene, and is used in preparing alkylated oil. It possesses alkylation selectivity, and the alkylated oil product has high octane number, C8 component accounting for 70-90 %, and the outstanding advantage of trimethylpentane proportion in the C8 component over 90 %. In addition, the catalyst can result in product yield up to 170-180 vol% of olefin feed.

The invention discloses modified MXenes powder as well as a preparation method and application thereof. The modified MXenes powder is prepared from a MXenes matrix which is of a layer structure and anano metal particle which is distributed between layers and / or on the external surface of the MXenes matrix; the modified MXenes powder is prepared through a metal ion intercalation method; the modified MXenes powder is used as a reinforcing phase to reinforce a metal material; and an obtained metal based composite material not only has excellent mechanical characteristics of high strength, high hardness, high wear resistance and high ductility and the like, but also has favorable electric conductivity and heat conductivity.

The invention discloses a cellulose fiber modification method, modified cellulose fibers prepared according to the method and application of the modified cellulose fibers. The method includes: pretreating cellulose fibers with alkoxide, drying, mixing with epoxy monomers, stirring, allowing reaction under heating, removing the epoxy monomers in a reaction system after reaction is finished, cleaning residues, and drying to obtain the modified cellulose fibers. The modified cellulose fibers are applied to filling modification of polymer materials. The cellulose fiber modification method has advantages of simplicity, safety, low cost and improvement of interfacial compatibility and interfacial force between the modified cellulose fibers and the polymer materials. The modified cellulose fibers are excellent in fiber dispersity, and the polymer materials adopting the modified cellulose fibers for filling modification are remarkably improved in water resistance.

Plastic-used high-flowability modified calcium carbonate comprises the following raw materials by weight: 0.3 to 0.4 part of sodium bicarbonate, 0.5 to 0.8 part of stannous chloride, 1 to 1.3 parts of sodium polyacrylate, 2 to 3 parts of nano iron-ore slag, 1 to 2 parts of isopropyl palmitate, 0.5 to 0.8 part of pre-gelatinized starch, 0.7 to 1 part of magnesium stearate, 0.5 to 0.8 part of cerium dioxide, 200 to 220 parts of heavy calcium carbonate, 5 to 9 parts of additives, and 20 to 30 parts of water. The modified calcium carbonate is simple in modification method, and is uniformly modified, and is higher in flowability and compressibility due to the addition of stannous chloride, isopropyl palmitate, pre-gelatinized starch, white dextrin and magnesium stearate, thereby ensuring uniform piece weight during a tabletting step and reducing the size of tablets under the same condition; due to the addition of cerium dioxide, the oxidation resistance and the abrasion resistance of plastic adopting the high-flowability modified calcium carbonate can be enhanced.

The invention relates to a gas-solid separation ceramic film and a preparation method thereof, belonging to the technical field of high temperature dedusting. Under extremely severe working conditions like high temperature and high pressure, a ceramic film supporting body and a film suffer from brittle rupture due to poor toughness of materials. According to gas-solid separation ceramic film modification methods in the invention, a small amount of micrometer toughening aids like zirconia powder, alumina silicate fiber and mullite are added into raw materials used for preparation of a ceramic film supporting body and a small amount of nanometer toughening aids like zirconia are added into raw materials used for preparation of a gas-solid separation film, so the toughness of the gas-solid separation silicon carbide ceramic film can be effectively improved; and with the two modification methods, on the premise that each excellent performance of the gas-solid separation ceramic film is not reduced, the toughness of the gas-solid separation ceramic film is improved and does not suffer brittle rupture and the like under severe working conditions.

The invention provides a nitrogen-doped carbon nano composite material coated by hollow copper doped monocrystalline silicon and a preparation method. The nitrogen-doped carbon nano composite materialcoated by hollow copper doped monocrystalline silicon is characterized by comprising a hollow nitrogen-doped carbon material, the hollow nitrogen-doped carbon material is externally coated with copper doped cobaltous nickel oxide. The prepared composite material has the characteristic of uniform structure and morphology, the ZIF-67 and polyaniline derived hollow nitrogen-doped porous carbon material supports the hollow polyhedral structure of the composite material, a doped copper element changes charge distribution of the eigenstate of cobaltous nickel oxide, and its catalytic performance isimproved; the copper doped cobaltous nickel oxide uniformly grow outside the hollow nitrogen-doped carbon material, and the problem is avoided that metallic oxide is easy to agglomerate. The nitrogen-doped carbon nano composite material has the advantages of being large in specific surface area, good in electrical conductivity, stable in physicochemical property, superior in electrochemical performance and the like.

The invention discloses a high heat conductive thermally-vulcanized silicone rubber composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 100 parts of silicone rubber, 0.5 to 5 parts of vulcanizer, and 1 to 1000 parts of heat conducting agent. The preparation method comprises the following steps: carrying a modification treatment on the heat conducting agent, rolling the silicone rubber on a roller, adding the modified heat conducting agent taken as the filling material, and the vulcanizer in order, evenly mixing, pressing into sheets, placing the sheets into a mould, and finally carrying out vulcanization in a flat vulcanizing machine, wherein the vulcanizing time is 5 to 10 minutes, the vulcanizing temperature is 160 to 190 DEG C, and the vulcanizing pressure is 10 to 12 MPa. The provided silicone rubber composite material has the characteristics of good mechanical performance and high heat conductive coefficient.

Aiming at the problem that hydrophilicity and thermal stability of a polypropylene lithium-ion battery separator are poor, the invention provides a method for layer-by-layer self-assembly of polyelectrolyte on the surface of a separator so as to improve the hydrophilicity and thermal stability of the polypropylene lithium-ion battery separator. According to the technical scheme, an aqueous solution polymerization method is adopted for respectively preparing anion polyelectrolyte containing an anion structural unit and cation polyelectrolyte containing a cation structural unit, and a pretreated polypropylene separator is repeatedly and alternately soaked in two polyelectrolyte solutions, so that macromolecule polyelectrolyte is self assembled onto the surface of the polypropylene separator under the action of an electrostatic force; the polypropylene lithium-ion battery separator prepared by adopting the method provided by the invention has high hydrophilicity and thermal stability, a static water contact angle is as low as 30 degrees; after the polypropylene lithium-ion battery separator is treated for 4 hours at the temperature of 130 DEG C, thermal shrinkage of the polypropylene lithium-ion battery separator is about 15% only; the method is easy to operate and strong in practicability, the defects of chemical modification and a general coating method are overcome, and the method disclosed by the invention can be put into industrial production.

The invention relates to a furan resin synthesized with modifying lignin. The furan resin is mainly prepared from, by weight, 8-15 parts of lignin, 3-5 parts of maleic anhydride, 1-3 parts of xylitol, 3-8 parts of urea, 80-120 parts of furfuryl alcohol and 8-20 parts of formaldehyde. In the process of synthesizing the furan resin, the modifying lignin serves as an intermediate and is added into a reaction system, the modifying method is simple, and the effect is good. The furan resin modified by the lignin is stable in product performance, low in free formaldehyde content and capable of meeting the performance requirements of most casting resin sand.

The invention discloses application of sulfated codonopsis pilosul polysaccharide to preparation of a herpes simplex virus type I resistance medicament and a preparation method of the herpes simplex virus type I resistance medicament. According to the invention, a sulphamic acid method is adopted to carry out sulphating modification on codonopsis pilosul polysaccharide, a modification method is optimized and an excellent prevention and treatment effect of codonopsis pilosul polysaccharide on the herpes simplex virus type I is found. Meanwhile, the sulfated codonopsis pilosul polysaccharide (the substituted ratio is 0.763) with the best activity is also screened out; no matter prevention administration or treatment administration, the cell survival rate of the sulfated codonopsis pilosul polysaccharide is higher than that of a virus control group (P is smaller than 0.01), the prevention effect of the sulfated codonopsis pilosul polysaccharide is equivalent to that of acyclovir (P is greater than 0.05) and the treatment effect of the sulfated codonopsis pilosul polysaccharide is superior to that of acyclovir (P is smaller than 0.05). The effect that the antiviral activity of the sulfated codonopsis pilosul polysaccharide is the highest is shown; the sulfated codonopsis pilosul polysaccharide can be used as a material for developing the novel HSV-I ( herpes simplex virus type I) resistance medicament and the material and theoretical foundation are provided for development of the novel HSV-I resistance medicament.

The invention relates to a HPLC (high-performance liquid chromatography) chromatographic column packing modification method. The method includes: putting HPLC chromatographic column packing in diazonium resin solution, stirring for reaction for 2-4h at the room temperature in a dark environment, carrying out centrifugal separation, washing and drying products, and performing exposure treatment under ultraviolet light for 10-20min. By adoption of photosensitive macromolecular diazonium resin as surface modifier, hydrogen-bonding interaction between the diazonium resin and surface silanol groups of silicon dioxide microspheres is converted into covalent bonding interaction by means of photo-crosslinking reaction, and accordingly hydrophobic groups can be introduced to the surface of the microsphere, and the modified chromatographic column packing has excellent separation effects.

The invention discloses a quick preparation method for a flexible strain sensor on the basis of a biaxial drawing technology. The preparation method comprises the following steps that: dispersing activated carbon materials in N, N-dimethylformamide solvent to be subjected to ultrasonic dispersion for 1h; then, adding a polymer material in the mixture, carrying out heating and stirring under a condition of 80DEG C until the polymer material is completely dissolved, and then, carrying out ultrasonic dispersion for 2h to obtain polymer nanocomposite solution; importing the solution into a mould,and moving into a drying oven to be dried; carrying out hot-pressing molding on the nanocomposite to obtain a nanocomposite sheet material; and finally, carrying out sequential biaxial drawing on thesheet material on a biaxial drawing machine to obtain a composite film, and connecting with an electrode and a conductor to manufacture the sensor. By use of the quick preparation method, the structure of an electric conduction filler can be quickly and conveniently regulated and controlled, the active filler is arranged in parallel and is favorably dispersed in a polymer matrix, in addition, thenanometer material can form a regular electric conduction network in the polymer matrix, and meanwhile, the method is favorable for improving the sensitivity of the strain sensor.

The invention discloses a manufacturing method of making sulfonating calixarene modify on the surface of nano silver to obtain the nano silver sol. The specific procedures are that: firstly, silver nitrate solution and sulfonating calixarene solution with same value and same viscosity are prepared, then the solution are added in secondary distilled water, sodium borohydride is added after mixing, and the nano silver sol modified by sulfonating calixarene is obtained through continuous mixing. With simple technics, the invention synthesizes the nano silver sol modified by sulfonating calixarene, wherein, nano silver sol modified by sulfonating [4] calixarene can conduct color comparison testing to isocarbophos, with higher selectivity and sensitivity, which not only has low cost, but also the reaction is quick and sensitive. The testing limit can reach 10 <-7> mol / L and can realize on-site testing. Besides, the preparation technics are simple and easy to practice, and the operability is strong; the common laboratory has condition to finish, thus having wide application prospect.

The invention belongs to the field of materials technology and specifically relates to a preparation method of modified expanded graphite grafted with silicon-phosphorous element. The preparation method comprises the following specific steps: hydrolyzing by the use of a silane coupling agent in an organic solvent containing water so as to produce silicon hydroxyl; carrying out a dehydration-condensation reaction between silicon hydroxyl and hydroxyl or carboxyl functional group on the surface of EG so as to generate C-O-Si bond, adding phosphoric acid to carry out a reaction between phosphoric acid and silicon hydroxyl on the surface of EG so as to generate Si-O-P bond, washing with ethanol or water, filtering, and drying to obtain modified EG. Heat resistance of the product is obviously enhanced. As the surface of EG is grafted with organic matter, interfacial compatibility between the EG and a polymer matrix is improved, the EG has good dispersity in the polymer matrix. Thus, flame retardant property of the EG can be fully performed. The prepared modified EG can be applied to many polymer matrixes, thus realizing expanding polymer flame-retardant modification application.