7702 results about "Compatibilization" patented technology

The invention discloses a polypropylene composite material based on rare earth element modification and a preparation method and application thereof, and belongs to the technical field of medical instruments, and the polypropylene composite material comprises the following raw materials in parts by weight: 100 parts of medical grade PP, 3-8 parts of a rare earth organic complex, 5-10 parts of nano-hydroxyapatite, 2-5 parts of a maleic anhydride grafted PP compatilizer and 0.3-0.5 part of an antioxidant, the invention also provides specific preparation steps and application thereof. According to the invention, oxide + salt bimorphological rare earth and an organic ligand are complexed to form a rare earth organic complex, so that the problem of poor dispersity of inorganic rare earth is solved, and meanwhile, the material is endowed with antibacterial and antistatic functions; through a melt blending-in-situ fiber forming process, the rare earth complex forms gradient distribution in a polypropylene matrix, the surface layer is enriched with antibacterial components, and the inner layer is enhanced in mechanical property, so that a low-cost solution with high strength, antibacterial property and biocompatibility is provided for high-end medical instruments, and the market blank is filled.

The invention belongs to the technical field of flame retardants, and particularly relates to a high-thermal-stability polyphosphate flame retardant and a preparation method thereof. The DOPO is modified through the polyethylene glycol acrylate, methyl methacrylate and dicumyl peroxide composite solution, double bonds of the polyethylene glycol acrylate and P-H bonds of the DOPO can be subjected to nucleophilic addition to form stable C-P bonds, and thermal migration of the DOPO is hindered; dOPO has polymerization double bonds of methyl methacrylate and long carbon chains of polyethylene glycol acrylate, so that the compatibility of the polyphosphate flame retardant and a polymer substrate is improved, and phase separation is avoided; maleic anhydride grafted silicone oil is connected to the surface of an amino modified gamma-cyclodextrin-modified DOPO inclusion compound, so that the polyphosphate flame retardant has high thermal stability and high compatibility after long-chain alkyl modification; amino groups in the modified gamma-cyclodextrin react with maleic anhydride grafted silicone oil to generate an amido bond cross-linked network, so that the thermal migration of DOPO is reduced together, and the high thermal stability of the polyphosphate flame retardant is improved.

The invention discloses a preparation method of a curing agent with biological self-healing capability, which comprises the following steps: preparing a bacillus pasteurii bacterial solution, preparing the bacillus pasteurii bacterial solution into an endophytic spore solution, immersing polyvinyl alcohol fibers into a sodium alginate / endophytic spore solution, taking out the polyvinyl alcohol fibers, immediately immersing the polyvinyl alcohol fibers into a calcium acetate solution, drying the polyvinyl alcohol fibers to obtain core fibers with a hydrogel coating, and curing the core fibers with the hydrogel coating to obtain the curing agent with biological self-healing capability. The preparation method comprises the following steps: taking magnesium phosphate cement as a raw material, immediately immersing the magnesium phosphate cement into a chloroform solution of a polystyrene and polylactic acid polymer blend, drying to obtain a coated microbial liquid, premixing urea and glucose, doping the premixed urea and glucose into the magnesium phosphate cement, uniformly stirring, adding the coated microbial liquid, and uniformly stirring to obtain the product. According to the invention, phosphate cement is adopted as the curing agent, has the advantages of high strength, short setting time, strong durability, low alkalinity, good biocompatibility and the like, and compared with the curing agent in the prior art, the curing agent not only has a good curing effect, but also has a crack self-healing function, and is especially suitable for reinforcing foundation soil.

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 relates to the technical field of polypropylene, and discloses a high-strength polypropylene composite material as well as a preparation method and application thereof in an automobile bumper. The high-strength polypropylene composite material comprises the following components in parts by weight: 70-90 parts of polypropylene resin, 10-30 parts of polycarbonate resin, 25-40 parts of glass fibers, 3-10 parts of an allyl carbonate grafted polypropylene compatilizer and the like. The compatilizer contains carbonate groups similar to polycarbonate, so that the compatibility between polypropylene resin and polycarbonate resin is improved, and the compatilizer has higher mechanical properties. Moreover, the compatilizer contains carboxyl and can form interaction with the surface of the glass fiber, so that the compatibility between the glass fiber and the polypropylene resin is improved, the glass fiber has a better reinforcing effect, the tensile strength, the impact strength and the bending strength of the composite material are remarkably improved, and the compatilizer has good practical application in the aspects of automobile bumpers and the like.

The invention discloses a high-viscosity activated rubber powder grafted functionalized block copolymer composite modifier and preparation thereof, composite modified asphalt and preparation and application thereof, and belongs to the technical field of modified asphalt. The composite modifier disclosed by the invention is formed by grafting catechol / polyamine modified aminated rubber powder and an epoxidized block copolymer. A catechol / polyamine group and an amino group are subjected to a condensation reaction to jointly modify the surface of the rubber powder, so that the surface of the rubber powder has rich functional groups and active sites, the rubber powder and an epoxidized block copolymer are subjected to a chemical crosslinking reaction in the later period, and the effect of enhancing the full performance of asphalt by the composite modifier is achieved; the problems that the composite modifier and the modified asphalt are prone to agglomeration, poor in compatibility and the like are solved. A self-healing mixture prepared from the composite modified asphalt and a self-healing material together has synergistic effects of the composite modified asphalt and the self-healing material, so that the pavement performance and the use quality are effectively improved, the service life of a road is prolonged, the energy loss is reduced, and the composite modified asphalt has application value in the field of roads.

An aqueous ultraviolet-absorbing resin emulsion, and an aqueous resin emulsion composition containing the emulsion is provided, wherein the emulsion is excellent in compatibility with a synthetic resin and light resistance. Also, the emulsion improves stability in blending with an aqueous emulsion of the synthetic resin, and prevents bleed out of the ultraviolet-absorbing resin on the surface of a coating film. Further, the aqueous ultraviolet-absorbing resin emulsion imparts excellent alkali or solvent resistance to a synthetic resin poor in alkali or solvent resistance. More specifically, an aqueous resin emulsion composition comprising (I) an aqueous ultraviolet-absorbing resin emulsion and (II) an other aqueous resin emulsion is provided, wherein the emulsion (I) is obtained by urethanizing (A) a polyol component having an ultraviolet-absorbing group {e.g., 1,1-bis[3-(2H-benzotriazol-2-yl)-4-hydroxy-benzeneethanol]methane}, (B) a polyol if necessary, (C) an alkyl or aryl dialkanolamine compound, and (D) an organic polyisocyanate in (E) an organic solvent, diluting the reaction mixture with (F) an organic solvent having a boiling point lower than 100° C. to give a resin solution, neutralizing the resin solution with (G) a neutralizing agent, and dispersing the resultant in water.

The invention discloses reactive compatible ACR-PHA core-shell latex and application thereof, and belongs to the field of polymer chemistry and material science. The latex comprises composite particles with core-shell, gradient core-shell, raspberry-shaped or Janus heterostructure, interfaces of ACR phase and PHA phase of the latex are connected through covalent bonds, and the compatibility problem of physical blending is fundamentally solved. The latex particles have a Z-average particle size of 80-400 nm, a PDI of less than or equal to 0.30, and a minimum film formation temperature (MFFT) of-10 to 12 DEG C. The coating prepared by the invention has excellent high-humidity barrier stability (WVTR is less than or equal to 65g / m.d), low-temperature rapid heat sealability, water resistance, oil resistance and complete recoverability, does not contain PFAS, is an ideal alternative scheme of a traditional PE (Polyethylene) spraying film, and is suitable for the fields of food packaging paper, paper cups, bowls and the like.

The invention relates to a dynamic-covalent hybrid cross-linked hydrogel material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a component A-phenylboronic acid modified polymer derivative in a biocompatible medium to obtain a solution A; dissolving a component B, namely a macromolecular derivative containing a vicinal diol group, into a biocompatible medium to obtain a solution B; dissolving a component C-double bond group modified polymer derivative in a biocompatible medium to obtain a solution C; and mixing the solution A, the solution B and the solution C with certain concentrations for a certain time, and performing illumination under a photoinitiator for a certain time to obtain the dynamic-covalent hybrid cross-linked hydrogel material. Compared with single dynamic bond crosslinking or covalent bond crosslinking, the prepared hydrogel material has machinability and mechanical stability; the hydrogel material has plasticity, shear thinning, self-repairing property and the like in the early stage of crosslinking; enough mechanical strength and long-term stability are realized in the later stage of crosslinking.

The invention discloses a preparation method and application of a water-based polyamide acid sizing agent, and belongs to the technical field of sizing agents. The method comprises the following steps: synthesizing polyamic acid in an organic solvent by adopting dianhydride and diamine in a polymerization manner, after the reaction is finished, cooling a polyamic acid solution to room temperature, transferring into a dropping funnel, dropwise adding into a solvent of which the volume is 10-25 times that of the solution, separating, completely dropwise adding, collecting a precipitate, and drying to obtain solid polyamic acid; and adding a low-grade ester or low-grade ketone solvent into the deionized water, adding the polyamide acid powder into the mixed solvent according to the solid content of 1-20wt.%, stirring at room temperature until the solid disappears, and standing for liquid separation to obtain a lower layer which is the polyamide acid water-based sizing agent. The sizing agent disclosed by the invention shows excellent dispersity and long-term stability. After sizing, polyamide acid on the surface of the carbon fiber is converted into polyimide through a thermal imidization reaction, so that the carbon fiber has high thermal stability and excellent compatibility.

The invention provides a composite solid electrolyte and a preparation method thereof, and belongs to the technical field of solid electrolyte materials. The solid electrolyte powder, the photosensitive resin monomer, the lithium salt, the plasticizer and the photoinitiator are used as raw materials to prepare the composite solid electrolyte, the plasticizer can be inserted between polymer chains, the compatibility of the solid electrolyte powder and a polymer is improved, electrode interface contact is improved, the flexibility of the composite solid electrolyte is improved, and the service life of the composite solid electrolyte is prolonged. The ionic conductivity of the composite solid electrolyte is further improved; the photosensitive resin monomer and the photoinitiator can be subjected to photopolymerization in-situ curing, so that the composite solid electrolyte has better mechanical property and flexibility, electrode interface contact is improved, and the ion conductivity is improved.

The present invention uses commercially available 3-aminopropylsilane coupling agent, diallylamino polyether acrylate, and an alkylating agent, or γ-propanesultone, or γ-butyrolactone as raw materials, and through an aza-Michael addition reaction and a quaternization reaction, a multifunctional silane coupling agent containing one or more quaternary ammonium cations, or sulfobetaine, or carboxybetaine in its molecular structure is prepared, which is used for the surface modification of bioactive glass, and the bioactivity, antibacterial and antifungal properties, and hydrophilicity enhancement effects after the surface modification of bioactive glass are obtained.

The invention provides an anti-aging flame-retardant epoxy resin coating and a preparation process thereof, and belongs to the technical field of coating preparation. The preparation process comprises the following steps: preparing the flame-retardant additive; preparing a coated modified black phosphorus nanosheet; preparing modified hollow glass beads; preparing the epoxy resin coating. The preparation method comprises the following steps: dissolving 3, 4-dihydroxy benzaldehyde and 2-amino-4-methylphenol in absolute ethyl alcohol, carrying out a heating reflux reaction, carrying out dehydration condensation on an aldehyde group in the 3, 4-dihydroxy benzaldehyde and an amino group in the 2-amino-4-methylphenol to generate an imine bond-containing intermediate, respectively dissolving the intermediate and phosphonitrilic chloride trimer, and carrying out a reaction to obtain the phosphonitrilic chloride trimer. The preparation method comprises the following steps: firstly, adding phosphonitrilic chloride into an intermediate, then mixing for reaction, enabling phenolic hydroxyl groups in the intermediate and phosphonitrilic chloride trimer to be subjected to nucleophilic substitution reaction to generate the flame-retardant additive containing phosphorus and a Schiff base structure, and the flame-retardant additive has relatively good compatibility with an epoxy resin matrix, is not easy to separate out and can effectively improve the flame-retardant property of the epoxy resin coating.

The invention relates to the technical field of thermal management material preparation, solves the technical problems of loose heat conduction network structure and non-uniform heat conduction direction of a flexible composite phase change material, and particularly relates to a magnetic polymer-based flexible composite phase change material and a preparation method thereof. Comprising the following steps: preparing a modified polydimethylsiloxane prepolymer from a carbon nanotube dispersion liquid and a polydimethylsiloxane prepolymer; adopting a Pickering emulsion method to mix 42 # paraffin, the modified polydimethylsiloxane prepolymer and nano cellulose to prepare a composite phase change material emulsion; silver mirror reaction is adopted to carry out surface silver plating on the magnetic neodymium iron boron particles; the magnetic polymer-based flexible composite phase change material is prepared from the composite phase change material emulsion and the surface-silvered magnetic neodymium iron boron particles. The high flexibility and magnetism of the prepared material in a normal temperature state endow the material with a more convenient installation mode and lower contact thermal resistance, the heat conduction network structure and component compatibility of the material are improved, and the application requirements of a phase change thermal management technology can be met.

The invention discloses preparation of DOPO-based hollow polymer microspheres and application of the DOPO-based hollow polymer microspheres in flame-retardant polymers, and belongs to the technical field of high polymer materials. The preparation method of the DOPO-based hollow polymer microspheres comprises the following steps: preparing a template core through self-stable precipitation polymerization, then polymerizing a DOPO-based flame-retardant monomer, an anhydride monomer and a cross-linking agent on the surface of the template core to construct a cross-linking shell layer in situ to obtain copolymer microspheres with a core-shell structure, and finally removing the template through solvent etching to obtain the DOPO-based hollow polymer microspheres. And the DOPO-based hollow polymer microspheres are prepared. The compatibility between the DOPO-based hollow polymer microspheres and a polymer matrix is greatly improved through rich anhydride groups on the surfaces of the DOPO-based hollow polymer microspheres, the flame retardant property of the polymer composite material is improved, the mechanical property of the polymer composite material is greatly improved, and due to the unique hollow structure of the polymer composite material, the flame retardant property of the polymer composite material is greatly improved. The polymer material is endowed with excellent transparency and low dielectric property.

The invention discloses a food-grade high-temperature-resistant coating and a preparation method thereof. The high-temperature-resistant coating is prepared from 60-75% of matrix resin, 18-28% of surface hydrophobic modified nano functional filler and 10-20% of auxiliaries, and the nano functional filler is prepared from 10-15% of nano silicon dioxide, 5-8% of nano aluminum oxide and 3-5% of nano titanium dioxide. According to the food-grade high-temperature-resistant coating and the preparation method thereof, surface hydrophobic modification is carried out on nano particles through a silane coupling agent, the compatibility and dispersion stability of the nano particles in a resin matrix are remarkably improved, coating defects caused by agglomeration at high temperature are avoided, a hydrophobic barrier is formed by the modified nano filler, the moisture permeability is reduced, and the high-temperature-resistant performance of the food-grade high-temperature-resistant coating is improved. And the damp-heat aging resistance of the coating is enhanced.

The invention provides a photosensitive resin composition containing an anthracene methyl modified melamine photosensitizer, a photosensitive dry film and application of the photosensitive dry film, the photosensitizer adopts a melamine skeleton to connect three anthracene 9-methyl structures, and through a rigid structure of the melamine skeleton and a methylene bridging (-CH2-An) design of an anthracene group, the photosensitive resin composition has the remarkable advantages that the methylene bridging structure can be used for preparing a photosensitizer, and the photosensitizer can be used as a photosensitizer for photosensitization of the anthracene methyl modified melamine photosensitizer. The breakage of carbon-oxygen bonds on alkoxy caused by p-pi conjugation is avoided, so that the migration of small molecular fragments after initiation is reduced, permeable crystallization to a polyethylene protective film is effectively inhibited, and the risk of short circuit of a line is remarkably reduced; the light quantum yield can be greatly improved by introducing a plurality of light sensing units; the melamine skeleton is used, so that the adhesive force of the initiation system on the metal foil surface can be effectively improved; in addition, the photosensitizer also shows excellent solubility and formula compatibility, and can be widely applied to the photocuring fields of dry films, paints, coatings, printing inks, molding materials and the like.

The invention discloses a wearable medical monitoring equipment electrode which is composed of a layered structure and comprises a transparent flexible substrate layer which is made of a biocompatible flexible polymer material and is used for providing flexible support and isolating a metal electrode from the skin; the metal grid copper transparent electrode layer is formed on the surface of the transparent flexible substrate layer through a yellow light etching micro-nano processing technology; the conductive gel layer uniformly covers the surface of the metal grid copper electrode layer; the encapsulation layer is formed by spin-coating a polymethyl methacrylate solution on the surface of the conductive gel layer and forming a transparent protection layer after curing; the gradient line width bionic honeycomb-shaped copper grid design is adopted, the light transmittance is kept, meanwhile, the collection efficiency of physiological electric signals is remarkably improved, signal transmission loss is reduced, through the polyacrylamide and nanocellulose composite gel formula and micro-channel dynamic humidity adjustment, signal stability under long-term wearing is ensured, and the application range is wide. The problem of signal distortion caused by dryness of traditional gel is solved.

The invention relates to a protein-based phenylboronic acid ester dynamic crosslinking hydrogel material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a component A, namely a phenylboronic acid modified protein polymer derivative, in a biocompatible medium to obtain a solution A; dissolving a component B, namely a macromolecular derivative containing a vicinal diol group, into a biocompatible medium to obtain a solution B; and mixing the solution A and the solution B with a certain concentration for a certain time to obtain the protein-based phenylboronic acid ester dynamic crosslinking hydrogel material. The boric acid ester dynamic cross-linking bond belongs to reversible chemical cross-linking reaction, and the prepared protein-based hydrogel material has enough mechanical strength and cheap operability. The protein-based hydrogel material disclosed by the invention can provide the effects of cell adhesion, proliferation and differentiation promotion, tissue regeneration and the like, can load and slowly release beneficial components for promoting tissue repair, is an ideal tissue engineering scaffold material, and can be applied to defect regeneration and repair of soft tissues, cartilages, bones and the like.

The invention discloses a high-interface-stability composite solid electrolyte membrane as well as a preparation method and application thereof. The composite solid electrolyte membrane comprises a gradient aperture three-dimensional porous skeleton formed by sintering inorganic solid electrolyte particles, a polymer electrolyte filled in a pore channel, and a plastic interface stable layer positioned between the electrolyte membrane and an electrode. The preparation method comprises the following steps: preparing a gradient aperture porous framework through a pore-forming agent template method and a tape casting technology, dipping and filling a polymer electrolyte precursor solution in a solution, accelerating in-situ polymerization by adopting electric induction, and performing hot-pressing treatment. The composite solid-state electrolyte membrane has high ionic conductivity, excellent interface compatibility and high mechanical strength, can effectively inhibit the growth of lithium dendrites, can be applied to solid-state batteries such as lithium metal batteries, lithium sulfur batteries and lithium air batteries, and can remarkably prolong the cycle life and improve the safety performance of the batteries, and the preparation process is suitable for large-scale production.

The invention relates to the field of new materials, and discloses a method for preparing a composite material by filling PLA / PBS with fibers, and the composite material comprises the following raw materials by weight: 30-40 parts of polylactic acid, 10-20 parts of poly (butylene succinate), 40-50 parts of fibers, and 1-3 parts of maleic anhydride grafted polylactic acid. Comprising the following steps: S1, performing gradient modification on fibers: S101, pretreating the fibers by using a compound enzyme; s102, in a polylactic acid melt blending stage, adding maleic anhydride to carry out in-situ grafting compatibilization; s2, low-temperature high-shear dispersion: mixing the fibers modified in the step S1 with polylactic acid, poly (butylene succinate) and maleic anhydride grafted polylactic acid. Through a fiber gradient modification technology, bio-enzyme pretreatment and maleic anhydride in-situ grafting compatibilization are utilized, and an interpenetrating network structure of a polylactic acid chain segment is formed on the fiber surface, so that the tensile strength of the composite material is effectively improved to 80-90 MPa.

The invention discloses a high-strength corrosion-resistant aramid composite material and a preparation process thereof, and relates to the technical field of aramid composite materials, the high-strength corrosion-resistant aramid composite material comprises the following components by mass: 60-80 parts of ethylene propylene diene monomer, 20-40 parts of hydrogenated nitrile rubber, 10-15 parts of polytetrafluoroethylene, 18-30 parts of a filler, 10-15 parts of aramid fiber, 5-8 parts of a plasticizer, and 3-6 parts of a vulcanizing agent. The EPDM rubber, the hydrogenated nitrile rubber and the polytetrafluoroethylene are compounded, and the aramid fibers and the filler are added, so that the composite material with good mechanical property and corrosion resistance is obtained; by modifying the ethylene propylene diene monomer and the aramid fiber, the compatibility among the materials is improved, and the comprehensive performance of the composite material is further improved.

The invention relates to a composition of polyester particles and sodium hyaluronate, which is prepared by the following steps: preparing PCL (Polycaprolactone) microspheres with the particle size of 20-50 microns by an emulsion method; hA is selected, and a PBS buffer solution is used for preparing an HA solution; repeatedly freezing and thawing in a refrigerator at-80 DEG C for 3 times to form micro-crosslinked HA gel; and mixing the microspheres and the micro-crosslinked HA gel according to a mass ratio of 25: 75. The invention provides a technology of taking the physically micro-crosslinked HA as a suspension carrier, so that the polyester particles or microspheres can be stably suspended in an HA solution system without a chemical crosslinking agent, and an injection product has better biocompatibility and safety. HA which does not contain a chemical cross-linking agent and polyester particles / microspheres are mixed to serve as a medical beauty filling system, and the problem of stable suspension of the polyester particles / microspheres in the HA is solved by performing physical micro-crosslinking on the HA.

The invention discloses self-adhesion-crosslinking double modified bamboo powder, a preparation method and application, and relates to the technical field of composites.The preparation method of the modified bamboo powder comprises the following steps that S1, bamboo powder, 2, 5-dihydroxyterephthalic acid, 4-aminobenzoyl hydrazine, N, N '-diisopropylcarbodiimide and tris (hydroxymethyl) aminomethane are mixed for a reaction; and S2, trimesic acid is added into the solution obtained after the reaction in the S1 for a reaction, filtering, washing and drying are conducted, and the self-adhesion-crosslinking double modified bamboo powder is obtained. The prepared modified bamboo powder is green and environmentally friendly, through a self-adhesion mechanism, a cross-linking mechanism, a branched-chain phenyl heterogeneous nucleation mechanism and the like, the interfacial compatibility of PBAT and the bamboo powder and the crystallinity of PBAT are improved, and therefore the mechanical property of PBAT / bamboo powder is enhanced.

The invention relates to a dispersing agent for garnet type solid electrolyte and a preparation method thereof, a special powder dispersing agent for dispersing garnet type solid electrolyte (LLZO, Li7La3Zr2O12) in an ethanol or isopropanol system is a polycarboxylic acid-polyether colorless transparent viscous liquid copolymer, and the copolymer is anchored on the surface of powder particles through the strong adsorption effect of carboxyl, so that the dispersing agent can be used for dispersing the garnet type solid electrolyte (LLZO, Li7La3Zr2O12) in an ethanol or isopropanol system. Meanwhile, the polyether chain segment realizes solvent compatibility and steric hindrance effect, the preparation method for the dispersing agent is a controllable free radical polymerization method and specifically comprises dozens of specific steps and conditions, and the dispersing agent has the advantages that the grinding particle size of the garnet type solid electrolyte can be effectively reduced, stable dispersion of powder in slurry is realized, and the dispersing effect is good. Powder agglomeration is inhibited, and the grinding efficiency is improved, so that the mass production requirement of the high-safety solid-state lithium ion battery is met.

The invention discloses a flexible fireproof cable and a preparation method thereof, and belongs to the technical field of cables. The cable comprises a conductor, a mica insulation layer, a copper protection layer, a buffer layer and a cable sheath layer. The buffer layer is made of a polyurethane foaming material; the cable sheath layer is prepared from the following components in parts by weight: 80 to 100 parts of methyl vinyl silicone rubber, 18 to 20 parts of modified carbon black, 5 to 8 parts of titanium dioxide, 1 to 2 parts of platinum catalyst, 3 to 6 parts of hydroxyl silicone oil, 0.5 to 1 part of zinc stearate and 0.8 to 1 part of dicumyl peroxide. The modified carbon black is added into the raw materials of the sheath layer, so that the compatibility, the interface bonding force and the flame retardant property of the carbon black and a silicone rubber matrix are effectively improved, and the mechanical property, the wear resistance and the fireproof property of the cable sheath layer are remarkably enhanced.

The invention belongs to the field of high polymer material chemistry, and particularly relates to double-network hydrogel based on sodium alginate / gelatin, a preparation method and dressing. A chemical method of grafting modification is adopted, grafting modification is carried out by designing abundant active groups on side chains of gelatin and sodium alginate, and based on traditional gelatin or sodium alginate hydrogel, not only is the thermal stability of gelatin improved, but also the biological activity of sodium alginate is improved, and the antibacterial property is achieved; the finally prepared SD / GelMA dual-network hydrogel wound dressing not only has excellent mechanical properties, but also has very high biocompatibility and antibacterial activity, and has huge application prospects and potential in the aspect of skin wound healing.

The invention provides loofah sponge nanocellulose hydrogel and a preparation method thereof.The preparation method comprises the following steps that anhydrous citric acid, choline chloride and water are mixed to react, and a ternary eutectic solvent is obtained; dispersing loofah sponge purified cellulose in a ternary eutectic solvent, washing and filtering a product to be neutral, dispersing the product in water, and performing ultrasonic treatment to obtain loofah sponge nanocellulose turbid liquid; dissolving sodium lignin sulfonate and lithium chloride in a sodium hydroxide solution to obtain a precursor solution; mixing the loofah sponge nanocellulose suspension with water, polyacrylamide, ammonium persulfate and N, N-methylene bisacrylamide, pouring the precursor solution into the loofah sponge nanocellulose suspension, uniformly stirring the mixture, pouring the mixture into a mold, and sealing the mold; and forming to obtain the loofah sponge nanocellulose hydrogel. The invention also provides an application of the hydrogel. The hydrogel disclosed by the invention has excellent biocompatibility, mechanical property and conductivity, has a wide application prospect in the field of flexible electronics, and is simple in preparation process, low in cost, green and environment-friendly.

The invention discloses zwitter-ion supramolecular hydrogel based on anion-pi as well as a preparation method and application of the zwitter-ion supramolecular hydrogel. The hydrogel is formed by self-assembly of a zwitterionic copolymer and a p-styrenesulfonic acid copolymer. According to the supramolecular hydrogel disclosed by the invention, the supramolecular hydrogel can be rapidly formed only by simply mechanically mixing the zwitterionic polymer copolymer and the p-styrene sulfonate copolymer solution, and the supramolecular hydrogel is endowed with excellent injectability and self-repairing performance due to the dynamic cross-linking characteristic. The hydrogel is composed of zwitterions with excellent immunocompatibility and poly (p-styrene sulfonate) with heparin-imitating performance, so that the hydrogel has excellent immunocompatibility, can play a role in various in-vivo application scenes, and in addition, the hydrogel can be used for preparing an anti-inflammatory drug. The dynamic cross-linked network based on anion-pi interaction and the heparin-like structure are very beneficial to protein preservation, and have wide application prospects in the fields of protein delivery and cell encapsulation.

The invention relates to the field of concrete, and provides high-cracking-resistance concrete and a preparation method thereof.The concrete comprises a surface modified rubber fiber composition, surface modified end-hooked steel fibers, Portland cement, fly ash, silica fume, a superplasticizer, mineral powder, coarse aggregate, fine aggregate and water. The surface modified rubber fiber composition is composed of millimeter-sized and micron-sized rubber fibers, and is subjected to alkali treatment, oxidative sulfonation and amination modification, so that the cement compatibility and interface bonding force of the fibers are improved; the surface modified end-hooked steel fiber is subjected to dopamine hydrochloride auto-polymerization deposition and drying curing treatment, and the reinforcing effect is improved. The preparation method comprises the steps of fiber pretreatment, admixture mixing, aggregate dry mixing, slurry preparation, fiber uniform dispersion and concrete forming maintenance, and material uniformity and performance stability are ensured. By optimizing fiber modification and component proportion, the cracking resistance and durability of the concrete are improved, and the concrete is suitable for high-performance building structures and engineering application.