1624 results about "Grafting" patented technology

The invention relates to the technical field of polymeric membrane materials, and particularly discloses an antistatic polyethylene composite membrane and a preparation method thereof. Comprising the following raw materials in parts by weight: 100 parts of low-density polyethylene, 5-9 parts of high-density polyethylene, 10-20 parts of maleic anhydride grafted polyethylene, 8-15 parts of a polyvinyl alcohol modified material, 3-5 parts of antistatic modified carbon black, 0.5-1 part of an antioxidant and 1-2 parts of a dispersing agent, the polyethylene composite film has excellent dispersibility, can effectively enhance the mechanical properties of the polyethylene composite film through the synergistic effect of physical filling and chemical grafting, forms a layer of conductive network structure, namely a conductive film, on the surface of the material through the combined effect of the polyethylene composite film and the antistatic agent, prevents the generation and accumulation of static electricity, and has good compatibility among the raw materials. And the material has excellent mechanical property and antistatic property.

The invention relates to the technical field of high polymer material preparation, and discloses a bamboo fiber graft modified full-biodegradable composite membrane material preparation process which comprises the following steps: firstly, performing hot mixing and cooling on dried bamboo fiber powder, anhydrous citric acid, choline chloride, activated zinc oxide and pentaerythritol to prepare a bamboo fiber modified premix; then mixing the biodegradable polyester resin with the premix; adding the mixture into an extruder, injecting epoxidized soybean oil into a barrel through a liquid metering device, and performing melt extrusion granulation under a vacuum exhaust condition; and finally carrying out blow molding to form the film. Through in-situ reaction extrusion of multi-component synergism, surface grafting of bamboo fibers, chain extension of a polyester matrix and interface chemical bonding of the bamboo fibers and the polyester matrix are achieved, interface compatibility is effectively improved, degradation of the material in the processing process is inhibited, and the mechanical property and thermal stability of the composite film material are remarkably improved; the process is efficient and environment-friendly, and the cost is controllable.

The invention discloses a preparation method of a Mg (OH) 2 / polydopamine multi-scale synergistic modified carbon fiber / epoxy resin composite material, and relates to the technical field of composite material preparation, and the preparation method comprises the following steps: S1, preparing a material solution and equipment; s2, preparation of the polydopamine modified carbon fiber; s3, preparing the Mg (OH) 2 / polydopamine multi-scale synergistic modified carbon fiber; and S4, preparing the Mg (OH) 2 / polydopamine multi-scale synergistic modified carbon fiber / epoxy resin composite material. Nano Mg (OH) 2 is introduced to the surface of the polydopamine modified carbon fiber by taking a coordinate bond as an acting force, so that an organic-inorganic combined three-dimensional structure interface layer is formed, and meanwhile, the wettability and the bonding effect between the carbon fiber and a matrix are improved by the method, so that the bending property of the composite material is more excellent; the method for introducing nano Mg (OH) 2 through coordinate bonds is simple, rapid and efficient, the original structure of the carbon fiber cannot be damaged, and complex operations such as chemical grafting and oxidation treatment are avoided.

The invention discloses an epoxy group modified zwitterionic polymer / heparin composite coating and a preparation method thereof. The preparation method comprises the following steps: firstly, constructing an amino-containing adhesion layer on the surface of a substrate by adopting a dip-coating method; then, the substrate is soaked in a mixed solution of the zwitterionic polymer and the heparin, and grafting of the zwitterionic polymer and the heparin on the surface of the medical material is completed through incubation. The coating provided by the invention has excellent hydrophilicity, can form a hydration layer, provides a physical barrier, and remarkably prevents adhesion and colonization of microorganisms. The inhibition rate of the coating on escherichia coli and staphylococcus aureus exceeds 99%, protein adhesion is remarkably reduced in an anti-protein adhesion experiment, and the coating is simple in strategy design, has a potential application prospect in the aspect of preventing blood contact catheter related infection and thrombosis, and has a wide application prospect. The complication occurrence rate and the medical care cost can be reduced.

The invention discloses a preparation method of a natural fiber prepreg with an improved impregnation effect, and relates to the technical field of composite material preparation, the method comprises the following steps: carrying out synergistic modification through fiber surface plasma activation and silane grafting, and combining a gradient pressure-temperature coupling impregnation system and ultrasonic-assisted permeation to prepare the natural fiber prepreg with the improved impregnation effect. And gradient filling and interface chemical bonding strengthening of the resin in the fiber bundle are realized. The core process comprises the following steps: pretreating fibers to improve surface energy and roughness, introducing a reactive diluent and a block copolymer into a resin system to regulate and control viscosity and transport capacity, constructing a pressure gradient by a multi-stage compression roller to drive resin to permeate into a bundle core, promoting uniform impregnation by infrared temperature control and ultrasonic cavitation, and finally obtaining uniform resin distribution and porosity lt. The interlayer shear strength is gt; and the high-performance prepreg is stable in batch under the pressure of 45 MPa. Reliable technical support and process guarantee are provided for large-scale engineering application of the high-performance natural fiber composite material.

The invention discloses a Zhejiang camellia japonica clone tissue culture and rapid propagation method. A Zhejiang camellia japonica clone tissue culture and rapid propagation technical system is established by taking a non-lignified tender stem as an explant, sterilizing and then performing primary induction, subculture multiplication, strong bud culture and rooting culture. The explants are soaked before primary inoculation, and vitamin C and polyvinylpyrrolidone with certain concentration are added into a primary induction culture medium, so that browning of the explants can be effectively inhibited; hormone regulation and control and nutrient addition are combined, so that the primary induction rate reaches up to 95.3%, the multiplication coefficient reaches about 6.8, the rooting rate reaches 83.5%, efficient and rapid propagation can be realized, and the method is not limited by factors such as seasons, climate and regions. The rapid propagation offspring obtained by the system can maintain all excellent characters of a stock plant, and the strong bud obtained in the process can be used as a scion for grafting propagation, so that a technical support is provided for protection, development and utilization of rare germplasm resources and excellent clone of the Zhejiang red camellia.

The invention relates to the technical field of intelligent materials, in particular to low-temperature-resistant magnetorheological fluid and a preparation method thereof.The low-temperature-resistant magnetorheological fluid is prepared from, by weight, 60-75 parts of magnetic particles; 3 to 15 parts of modified magnetic particles; 10-25 parts of low-temperature-based carrier liquid, which comprises 40-60% of silicone oil and / or mineral oil, 20-30% of synthetic ester and 10-20% of poly-alpha-olefin; 0.1 to 1.0 part of a dispersant; 0.5 to 2.0 parts of an anticoagulant; wherein the modified magnetic particles are prepared by coating magnetic particles with SiO2 aerogel and grafting the coated magnetic particles with fluorine-containing silane; the preparation method comprises the steps that magnetic particles are sequentially subjected to silane coupling agent treatment, aerogel deposition and fluorine-containing silane gas-phase grafting, and modified magnetic particles are prepared; carrying out ultrasonic mixing on the base carrier liquid and an anticoagulant at 40-60 DEG C for 30 minutes; adding magnetic particles, modified magnetic particles and a dispersing agent, dispersing by adopting a micro-jet homogenizer, and then carrying out gradient cooling treatment. The low-temperature-resistant magnetorheological fluid has the effect of improving the low-temperature-resistant performance of the magnetorheological fluid.

The invention relates to the field of optical protection materials, and provides a transparent film with laser eavesdropping prevention performance and a preparation method thereof.The transparent film is composed of surface-modified doped tungsten oxide nanosheets, amino-isocyanate bifunctional lithium niobate nanowires, urethane acrylate, an ultraviolet light absorber, a silane coupling agent, a dispersing agent and a flatting agent; the molybdenum-doped tungsten oxide nanosheets are obtained through silane coupling modification after hydrothermal synthesis, and the lithium niobate nanowires are prepared through a gradient modification process of hydrothermal synthesis-silane coupling-isocyanate grafting-phenol end capping. A modified nano material is uniformly dispersed in a resin matrix through an ultrasonic dispersion composite technology, and through blade coating forming, ultraviolet curing and constant-temperature and constant-humidity post-treatment, compared with the prior art, the scheme overcomes the problems that a traditional protective film is insufficient in optical transparency, laser eavesdropping prevention function and dynamic viscoelasticity, and is suitable for the field of high-end security and protection.

The invention discloses a light telegraph pole cement material and a preparation method thereof, and relates to the technical field of cement concrete. The method comprises the following steps: firstly, carrying out acid pickling, silane coupling agent grafting and nanoparticle vacuum impregnation treatment on shale ceramsite to obtain modified light ceramsite; the preparation method comprises the following steps: ultrasonically dispersing graphene oxide, compounding with Portland cement clinker and modified fly ash, and reacting with epoxy resin emulsion, a curing agent and a silane coupling agent to prepare organic-inorganic composite modified cement; the bamboo skeleton is subjected to silane coupling agent pretreatment to obtain a modified skeleton; then, mixing composite cement, an additive and water into slurry, adding the modified ceramsite and aggregate, and performing high-speed stirring and ultrasonic dispersion to form homogeneous concrete slurry; and finally, putting the modified bamboo skeleton into a mold, injecting the slurry, and performing centrifugal forming, steam curing and natural curing to obtain the cement material. The prepared lightweight telegraph pole cement material has excellent mechanical strength.

The invention discloses an SBS modifier and a preparation method and application thereof, an asphalt coating material composition and a preparation method thereof, and a waterproof coiled material. The preparation method of the SBS modifier comprises the following steps: dissolving SBS in a first solvent to obtain an SBS solution; the method comprises the following steps: adding a sulfydryl compound into an SBS solution, and carrying out solution graft polymerization at 50-90 DEG C to obtain graft modified SBS which is grafted with alkyl containing any one of hydroxyl and carboxyl through sulfydryl, or grafted with sulfydryl and grafted with hydroxyl substituted or unsubstituted alkyl through sulfydryl; adding the biomass carbon aerogel and the graft modified SBS into a second solvent according to a mass ratio of 1: (0.5-1.5) to obtain a first mixed solution; adding concentrated sulfuric acid and sodium hypophosphite into the first mixed solution, and reacting at the temperature of 120-130 DEG C to obtain the SBS modifier. According to the preparation method of the SBS modifier, the polarity of the SBS is changed through sulfydryl grafting of the SBS, namely the polarity of the SBS is closer to that of asphalt; and the grafted modified SBS reacts with the biomass carbon aerogel to form a macromolecular compound, so that the performance degradation in the aging process of the coiled material is prevented.

The invention relates to the technical field of photovoltaics, in particular to a method for testing the grafting rate of silane grafted polyolefin for a photovoltaic packaging adhesive film. Comprising the following steps: S1, extracting a silane grafted polyolefin grafting material in an organic solvent to remove unreacted silane or residual peroxide, washing for multiple times after extraction is completed, and drying for later use; and S2, weighing and recording the mass of the crucible and the extracted silane grafted polyolefin colloidal particles, then putting the crucible filled with the colloidal particles into TGA for calcination, weighing the total mass of the crucible and the sample after calcination is finished, and converting the relative grafting rate by using the ash content of the TGA. According to the invention, the grafting rate of silane grafted polyolefin can be timely and effectively tested and evaluated, so that the grafting stability in the grafting material production process can be truly reflected. Meanwhile, the grafting rate testing method is high in efficiency, simple and reliable to operate.

The invention relates to the technical field of fibers, and discloses an antistatic warm-keeping fiber and a preparation method thereof. The preparation method comprises the following steps: carrying out graft modification on a far infrared material graphene oxide through functionalized POSS, introducing the modified graphene oxide and an ionic liquid into polypropylene, carrying out melt grafting to prepare an antistatic polypropylene master batch, introducing the master batch into polypropylene slices for spinning, and carrying out a synergistic antistatic effect of an inorganic antistatic agent graphene and an organic antistatic agent ionic liquid to prepare a composite material. The prepared fiber has antistatic performance and far infrared heating performance, and meanwhile, the POSS structure with excellent thermal stability is introduced, so that the heat resistance of the fiber is further improved.

The invention discloses silicon-based synthetic leather and a preparation method thereof. The synthetic leather comprises base cloth, a silicone rubber layer and a surface treatment layer, wherein the surface treatment layer comprises vinyl-terminated polysiloxane, hydrogen-containing polysiloxane, a reaction inhibitor, a platinum catalyst, silicon dioxide microspheres, hyperbranched vinyl polyurethane and cyclic siloxane; the molar ratio of vinyl in the vinyl-terminated polysiloxane to silicon hydrogen in the vinyl-terminated polysiloxane is 1: (1.05-1.12), and the hyperbranched vinyl polyurethane is prepared by carrying out condensation polymerization on polyol acrylate and isocyanate in the presence of a catalyst and then carrying out end-capping reaction with a vinyl end-capping agent. The formula of the surface treatment layer is optimized, the molar ratio of vinyl to silicon hydrogen is 1: (1.05-1.12), dense vinyl of hyperbranched vinyl polyurethane (HVPUA) reacts with residual Si-H, interface bonding is enhanced by combining amino silane grafting, and silicone oil precipitation is reduced synergistically.

The invention provides a degradable biological membrane and a preparation method thereof. The degradable biological membrane is prepared from the following raw materials in parts by weight: 60-70 parts of PBAT, 30-40 parts of PLA, 5-10 parts of microcrystalline cellulose composite modified particles, 0.5-2 parts of a chain extender, 1-2 parts of a coupling agent, 0.5-1 part of an anti-hydrolysis agent and 0.5-1 part of an antioxidant. The degradable biological membrane is obtained through the working procedures of mixing, extrusion granulation, curtain coating cooling, two-way stretching and the like. Wherein the microcrystalline cellulose is modified through the procedures of carboxylation, cross-linking, monohydroxyl end-capping grafting and the like at a specific degree to prepare composite modified particles, so that the degradable biological membrane has good mechanical properties and waterproof and breathable functions.

The invention discloses a high-survival-rate method for grafting pinus sylvestris on pinus sylvestris in an alpine region. The grafting adaptability and the survival rate are improved through multi-dimensional innovation. A rising slope is arranged on the sunny side of a pinus sylvestris rootstock, double connectors of a falling slope are arranged on the shady side of the pinus sylvestris rootstock and matched with double wedge-shaped parts of Tibetan white bark pine scion buds, and the rootstock-scion contact face is increased; a photo-thermal response shape memory polymer bandage is adopted for fixation, germs are inhibited, and callus differentiation is promoted; a double-layer protection structure is constructed, a humidity control group is arranged in an inner-layer moisturizing breathable film to maintain the humidity of a connector to be larger than or equal to 60%, and an outer-layer anti-UV windproof net is intelligently adjusted to cope with sand wind and strong light. Furthermore, the callus differentiation is accurately regulated and controlled by pre-embedding pH responsive cellulose microspheres, or an intelligent temperature control film and an aerogel layer are additionally arranged to stabilize the temperature difference, and the freezing resistance is enhanced in combination with scion bud low-temperature domestication and abscisic acid treatment. The method remarkably improves the grafting survival rate, is suitable for efficient introduction of the Tibetan white bark pine in the alpine region, and is high in process synergy and high in environmental adaptability.

The invention discloses an antifouling wear-resistant auxiliary agent and a preparation method and application thereof, and belongs to the technical field of fluorine-containing functional preparations, the antifouling wear-resistant auxiliary agent is prepared from the following raw materials by mole: 1-2 parts of single-ended active perfluoropolyether alcohol PFPE-OH; 1 to 2 parts of isophorone diisocyanate; 1 part of nano silicon dioxide containing hydroxyl groups on the surface; 2 to 5 parts of monoisocyanate containing unsaturated bonds; 2 to 25 parts of acrylic acid hydroxyl ester; 40 to 400 parts of a comonomer; 2-20 parts of a reaction active monomer; the reactive monomer contains an unsaturated bond and is used for side chain grafting. The antifouling wear-resistant auxiliary agent comprises a nano silicon dioxide hybrid multi-branched polymer containing a perfluoropolyether group, contains a plurality of unsaturated sites, is suitable for a UV curing coating system, and can significantly improve the antifouling and anti-fingerprint characteristics and wear resistance of the surface of a coating.

The invention relates to the technical field of proton exchange membranes, and provides a covalent grafted heteropoly acid modified perfluorosulfonic acid membrane as well as a preparation method and application thereof. According to the invention, polypropylene glycol monoalkyl ether and Keggin type vacancy heteropoly acid are subjected to covalent grafting, and then the obtained covalent grafted heteropoly acid is used as an additive to modify the perfluorosulfonic acid membrane, so that the leakage problem of heteropoly acid in the proton exchange membrane can be effectively relieved, and meanwhile, the excellent proton conduction performance of heteropoly acid is also retained; moreover, the polypropylene glycol monoalkyl ether has relatively large molecular weight, so that the heteropoly acid can be anchored more firmly in the perfluorosulfonic acid membrane, and the proton conduction capability of the heteropoly acid is fully exerted. The result of the embodiment shows that the covalent grafted heteropoly acid modified perfluorosulfonic acid membrane provided by the invention shows excellent proton conduction performance and chemical stability, and has a wide application prospect.

The invention relates to the technical field of packaging materials, in particular to a chip inductor packaging material and a preparation method thereof. The packaging material is prepared from epoxy resin serving as a matrix, composite boron nitride modified hollow glass beads, spherical silica powder, a silane coupling agent, a curing agent, an accelerant and a defoaming agent. Wherein the boron nitride modified hollow glass beads are obtained by constructing a boron nitride functional layer through branched polyamidoamine grafting and a melamine-boric acid in-situ method and carrying out high-temperature calcination. By means of the innovative structural design, efficient bonding of a filler interface and ordered construction of a heat conduction path are achieved, the heat conduction performance and the mechanical strength of the composite material are remarkably improved, and the dielectric constant and the dielectric loss are effectively reduced. The packaging material provided by the invention has excellent electrical, thermal and mechanical comprehensive performance, meets the requirements of light weight and high reliability packaging of a new generation of high-performance chip inductor devices, and has important industrialization and application prospects.

The invention discloses an epoxy resin tack coat oil material suitable for a steel bridge deck, which constructs a multi-scale toughening composite system through the synergistic effect of an epoxy-terminated polyurethane elastomer toughening agent (molecular-scale chemical grafting) and a nano-scale elastomer filler (nano dispersion toughening), and solves the problem of rigidity-flexibility imbalance of the traditional epoxy tack coat oil. The material has the advantages of fast curing (surface drying at 25 DEG C is less than or equal to 4 hours), high toughness (the elongation at break is greater than or equal to 250%) and excellent weather resistance (the performance retention rate is greater than or equal to 85% after ultraviolet aging for 500 hours), and is suitable for interlayer interface bonding of steel bridge deck pit slot and crack repair. According to the preparation method, uniform dispersion and interface chemical bonding of the nanofiller are achieved through a segmented stirring process, the comprehensive performance of the material is remarkably improved, and the important engineering application value is achieved.

The invention relates to the technical field of pavement materials, in particular to a solid waste-based cementing material stable coal-based solid waste road base material and a preparation method thereof. According to the material, secondary modified regenerated coarse and fine aggregate is used as a framework, coal gangue powder and granulated blast furnace slag micro powder are matched, and two-step engineering of dopamine / double-amino-terminated polyethylene glycol co-deposition grafting and high-modulus silicate pre-coating is adopted, so that the synergistic improvement of the surface wettability and the interface density of the aggregate is realized. The system is cooperated with low-modulus excitation liquid and polypropylene fibers, and the mixing uniformity of the material and the quality of an interface transition area are optimized through a thin-pulp stone-wrapping and densification segmentation process. The material gives consideration to high resilience modulus, rut resistance and durability, significantly reduces the problems of high water absorption, weak interface, early cracks and the like of the recycled aggregate, is adaptive to a traditional road construction window, and has good application prospects.

The invention relates to the technical field of functional fabrics, in particular to an electromagnetic shielding flame-retardant fabric and a preparation method thereof. The preparation method comprises the following steps: S1, mixing an activated phosphate ester solution with polyaniline for reaction, and then adding a cross-linking agent for reaction to obtain a composite grafting agent; s2, the Ti < 3 > C < 2 > T < x > and the composite grafting agent are subjected to a reaction, and multifunctional grafting modified Ti < 3 > C < 2 > T < x > is obtained; and S3, immersing a polyester fabric into a dispersion liquid containing the multifunctional grafting modified Ti3C2Tx, and drying to obtain the electromagnetic shielding flame-retardant fabric. According to the preparation method, Ti3C2Tx is subjected to multifunctional grafting modification by adopting a halogen-free flame retardant and a water-based process, and the Ti3C2Tx is combined with triethyl phosphate and polyaniline to prepare the composite material with dual functions of electromagnetic shielding and flame retardance. The composite material is adopted to modify polyester fabric, and fabric with efficient electromagnetic shielding and flame retardant functions and high mechanical strength can be prepared.

The invention discloses a multi-plant parallel grafting, seedling gathering, rough cutting and positioning device for solanaceae vegetables and a method thereof, and belongs to the field of agricultural machinery. In the device, a rough cutting seedling feeding mechanism is used for positioning scion seedlings, cutting off scion seedling matrixes and clamping scions; the scion seedling gathering mechanism is used for gathering and positioning the scions clamped by the rough cutting seedling feeding mechanism; the rootstock seedling gathering mechanism is used for gathering the rootstocks. The device is used for rough cutting, positioning and seedling gathering of multiple scion seedlings and seedling gathering of rootstocks during full-automatic grafting of solanaceae, useless rhizome matrix parts below the scion seedlings can be sheared, follow-up grafting operation of multiple scions and rootstocks can be completed synchronously, the positioning speed of the scions and the rootstocks is increased, grafting efficiency is improved, and operation difficulty is reduced; according to the method, multiple scion seedlings and stocks can be treated at a time, manual single-plant operation is not needed, the production efficiency is effectively improved, the labor cost is saved, and convenience is provided for subsequent grafting work.

The invention relates to the technical field of aerogel, in particular to flexible flame-retardant aerogel and a preparation method thereof.The flexible flame-retardant aerogel is prepared from modified graphene, modified polyvinyl alcohol, silver nanowires, phytic acid and epoxy resin E-51; the furan group is introduced into the aerogel through the modified graphene, the furan group and the maleimide group are subjected to a D-A reaction, an adhesive is prevented from being used when the aerogel is bonded with a screen backboard, the D-A reaction is reversible, and lossless reworking can be realized. PVA and epoxy resin E-51 are added together, so that the heat resistance and mechanical strength of the material are improved. PVA is grafted with a large-steric-hindrance amine group, weak interaction with a furan group is generated, side reaction with an epoxy group of epoxy resin E-51 is avoided, and when aerogel is bonded to an OLED screen backboard, the protective layer is reversibly released, so that D-A reaction can be smoothly carried out. The hydrophobic treatment of the modified graphene and the modified grafting of the polyethylene to the mPEG can effectively improve the agglomeration of the modified graphene and ensure the uniform dispersion of the modified graphene.

The invention relates to the technical field of composite materials, and particularly discloses a SiO2-coated LDHs nano composite material with high adsorption efficiency and a preparation method thereof.The preparation method comprises the steps that SiO2 nano particles are modified through double coupling agents, chitosan and F127 double template agents are combined to synthesize an LDHs precursor, and then the LDHs precursor is prepared into the SiO2-coated LDHs nano composite material. In-situ growth of a core-shell structure is realized by using a micro-channel reactor, an interface is strengthened by depositing Al2O3 through ALD, and interlayer ions are finally pre-loaded through hierarchical pore carbonization and thermo-sensitive-light response polymer grafting, so that the SiO2 (at) LDHs composite material with triple interface protection, a hierarchical pore structure and an intelligent response function is formed, the adsorption capacity and the cycling stability are remarkably improved, and the application range is wide. And the production cost is greatly reduced.

The invention provides an ultra-high molecular weight polyethylene fiber resin composite material interface regulation composition which comprises the following components in parts by weight: 100 parts of ultra-high molecular weight polyethylene fiber, 12 parts of polyethylene, 0.6 part of a compatilizer, 0.03 part of an initiator, 2.5 parts of gallic acid, 1 part of tetraethylenepentamine and 5 parts of nano silicon dioxide. The compatilizer is used for melt grafting with polyethylene, and the initiator is used for initiating melt grafting of the compatilizer and polyethylene. The invention also provides a method for carrying out interface regulation and control by adopting the interface regulation and control composition and an ultra-high molecular weight polyethylene fiber resin composite material prepared by the method. The ultra-high molecular weight polyethylene fiber resin composite material obtained by carrying out interface regulation and control treatment on the ultra-high molecular weight polyethylene fiber resin composite material interface regulation and control composition has a good interface state, excellent mechanical properties and good impact resistance.

The invention discloses a crown ether grafted polyarylether sulfone ion separation membrane as well as a preparation method and application thereof, and belongs to the technical field of ion separation membranes, collaborative optimization is realized through crown ether accurate grafting and ultrathin ordered membrane formation: a main chain of polyarylether sulfone is grafted with 4 '-aminobenzo-12-crown-4 to form an inherent channel adapted to Li, and the specific surface area of the main chain is increased; the ultrathin film is prepared by a water surface spreading method, and the ion transmission path is shortened. Finally, in a LiCl / MgCl system, Liion flux has high selectivity, high permeation-high selectivity cooperation is preliminarily realized, the chemical synthesis step can be amplified to a kilogram level, and after a DPAES-g-CE / dichloromethane solution is dropwise added to the water surface, the DPAES-g-CE / dichloromethane solution is rapidly spread to form a film without precise equipment; the raw materials are industrial-grade monomers and have no toxic residues, the membrane can be recycled and reused through dichloromethane, the equipment cost is reduced by about 90%, and industrialization is easy; the main chain of the polyaryl ether sulfone is high in rigidity and resistant to high temperature and chemical corrosion; crown ether grafting avoids molecular chain agglomeration, and the swelling rate is far lower than that of a traditional sulfonated membrane.

The invention discloses a flame-retardant thermoplastic polyurethane elastomer material and a preparation method thereof, and belongs to the technical field of modified nano materials. The preparation method comprises the following steps: dissolving melamine, phytic acid and boron nitride in deionized water, carrying out oil bath, adding a coupling agent, stirring, carrying out vacuum filtration, washing with water, and drying to obtain a layered nano flame retardant; the preparation method comprises the following steps: dispersing a flame retardant in deionized water containing a nonionic dispersant, and carrying out ultrasonic treatment; the preparation method comprises the following steps: reacting polyether polyol with diisocyanate to obtain a primary prepolymer; adding other auxiliary agents, stirring, and carrying out gradient heating polymerization; and injecting into a mold, curing for 6-12 hours at 105-125 DEG C, and drying for 12-24 hours at 80-90 DEG C. A phosphorus-nitrogen-silicon ternary synergistic flame-retardant system is introduced, the boron nitride nanosheet surface grafting and dynamic pre-polymerization-gradient heating process is optimized, the dispersity is improved, and smoke suppression and thermal stability are achieved. Compared with the prior art, the flame retardant efficiency is high, the mechanical property is excellent, and environmental friendliness is achieved.

The invention provides an exosome enrichment method based on a modified cellulose material, which comprises the following steps: carrying out TEMPO oxidation on plant residue cellulose to prepare a cellulose material with a carboxyl structure; the cellulose structure is further refined by adopting mechanical shearing and high-pressure homogenizing means, so that the specific surface area and the dispersion stability are remarkably improved; through polyethyleneimine PEI grafting, a large number of amino functional groups are introduced, the surface electropositivity of the material is enhanced, and efficient adsorption and enrichment of exosomes with negative charges are achieved. The invention also provides the exosome prepared by the method. The modified cellulose material disclosed by the invention is wide in source, simple and convenient to prepare and mild in enrichment process, the separation purity and the enrichment efficiency of the exosome can be remarkably improved, and the modified cellulose material has good biocompatibility and environmental friendliness; compared with existing ultracentrifugation, density gradient centrifugation and immunoaffinity separation methods, the method has the advantages that the operation process is simplified, the equipment dependence and reagent cost are reduced, and the potential of large-scale production and clinical application is achieved.

The invention provides a uniaxially stretched polyethylene composite film material as well as a preparation method and application thereof, and belongs to the technical field of film materials. According to the invention, through ultrasonic stripping, 3-aminopropyltriethoxysilane modification and N, N-dimethyl octadecyl ammonium chloride intercalation, the dispersibility and interfacial compatibility of montmorillonite are improved, and zinc oxide is introduced to endow antibacterial and ultraviolet shielding functions; maleic anhydride grafting enhances the interface bonding force; in metallocene polyethylene modification, through synergistic grafting of maleic anhydride and glycidyl methacrylate, a polar group is introduced, so that the compatibility of the metallocene polyethylene and a polar nano material is improved, and the flexibility and the processability are improved; magnesium chloride promotes grafting efficiency, and tributyl phosphate improves dispersibility and fluidity. The barrier property, the mechanical property and the processability of the composite material are enhanced through the synergistic effect, and the application requirement of a high-performance film is met.

The invention provides organic phosphonic acid betaine and a preparation method thereof, and particularly relates to glycidyl-containing ammonium-phosphine type betaine, the organic phosphonic acid betaine can be used as a functional monomer for surface free radical grafting modification of high polymer materials such as polyolefin, or can be used as a functional monomer for copolymerization of acrylic ester, acrylonitrile or other olefin monomers, or can be used as a functional monomer for surface free radical grafting modification of high polymer materials such as polyolefin, or can be used as a functional monomer for surface free radical grafting modification of high polymer materials such as polyolefin. The amphiprotic ionomer can also be used for ring-opening grafting modification of starch, cellulose, polyurethane, polyamide and other high polymer materials containing amino or hydroxyl in the structure, and meanwhile, the obtained high polymer materials are endowed with the functional effects of amphiprotic ionization, hydrophilicity, antibacterial property, antifouling property and the like of phosphonic acid betaine. And the chemical stability in an acid-base water environment is high.