1544 results about "Hydrogen bond" patented technology

The invention relates to the technical field of liquid-liquid homogeneous microextraction, in particular to a method for microextraction analysis of perfluorooctanoic acid by using a switchable eutectic solvent. Comprising the following steps: step 1, mixing a hydrogen bond acceptor and a hydrogen bond donor according to a set proportion value, and stirring and mixing at a set temperature value to obtain a eutectic solvent; step 2, filtering the water sample through a water-based filter membrane, then adding a set amount of deep eutectic solvent, dropwise adding an alkaline solution, carrying out full vortex mixing through a mixer, and then adding an acidic solution to form an emulsion; according to the method, the high selectivity of the green solvent with a specific structure on perfluorooctanoic acid and the characteristic that the solvent is switched between hydrophilic and hydrophobic forms are utilized, so that the microextraction time is shortened, and the impurity removal and enrichment effects are enhanced. The method is simple and convenient to operate, green, environment-friendly, low in cost and good in effect, has the advantage of efficiently and rapidly pretreating the batch small-size complex matrix sample, and has a relatively good application prospect.

The invention relates to the field of preparation of polyurethane damping materials, in particular to a preparation method of a repairable polyurethane damping material based on multiple hydrogen bonds and metal coordination. Compared with a traditional damping material, the damping material has a higher damping temperature range and has a good damping effect at the temperature of-20 DEG C to 60 DEG C. Multiple reversible hydrogen bonds are introduced through diamine containing amido bonds, the material is endowed with self-repairing and high mechanical strength, and damping and self-repairing performance is further enhanced through pyridine nitrogen atom metal coordination. Starting from molecular structure design, multiple hydrogen bonds and metal-ligand coordination bonds constructed on a polyurethane molecular main chain play a role in synergistic enhancement, energy can be effectively dissipated through dissociation and recombination of the multiple hydrogen bonds and fracture and association of the metal coordination bonds, and the energy consumption is reduced. The polyurethane material is endowed with excellent damping performance and self-healing capability by the dual dynamic action.

The invention discloses a multi-hydrogen bond enhanced fluorine-containing core-shell water-based binder as well as a preparation method and application thereof, and relates to the technical field of lithium ion silicon-based negative electrode binders. The preparation method comprises the following steps: dissolving methyl methacrylate, acrylonitrile and an emulsifier in water, carrying out a polymerization reaction to obtain a rigid core emulsion, adding acrylic acid long-chain ester, a fluorine-containing monomer and acrylamide, carrying out a mixing reaction to obtain a core-shell structure emulsion, mixing the core-shell structure emulsion with a sodium alginate solution, adding nano SiO2, and carrying out a polymerization reaction to obtain the high-temperature-resistant water-based acrylic emulsion. And after the reaction is finished, obtaining the multi-hydrogen bond enhanced fluorine-containing core-shell water-based adhesive. Through core-shell structure design and introduction of a multiple hydrogen bond network, the problem of bonding caused by volume expansion of the silicon negative electrode material in the charging and discharging process is successfully solved, the cycle life and stability of the battery are remarkably prolonged, meanwhile, the environment-friendly characteristic and the process simplicity are considered, and the preparation method is simple and convenient. And an efficient and sustainable development solution is provided for the field of lithium ion batteries.

The invention discloses a durable low-surface-energy polymer modifier capable of freezing on the surface of a matrix and a preparation method thereof, the main chain of the durable low-surface-energy polymer modifier comprises a polydentate hydrogen bond monomer structure, and the end group of the polymer chain is a fluorinated structure. The durable low-surface-energy polymer modifier disclosed by the invention is co-mixed with matrix resin through a conventional processing and mixing means in a standard production process, and is migrated to the surface of a material in processing, heat treatment and use processes, so that the durable low-surface-energy polymer modifier can achieve multiple effects of water resistance, pollution resistance, dust prevention, anticoagulation, antithrombosis, antibiosis, self-cleaning and the like; the multidentate hydrogen bond monomer structure in the modifier structure realizes freezing of the modifier on the surface of matrix resin, so that the risk of elution and loss of the modifier is effectively reduced, the possibility of migration, washing or dissolution in blood is reduced, and the low surface energy durability effect of the matrix surface is enhanced.

The invention discloses an in-situ autocatalytic forming gel epidermal electrode, an electrophysiological signal monitoring system and an electrophysiological signal monitoring device. The gel precursor includes a supramolecular solvent selected from a specific monomer, a metal ion catalyst, an initiator, a cross-linking agent, and a hydrogen bond acceptor and a hydrogen bond donor. The gel precursor provided by the invention can perform autocatalysis to initiate crosslinking to form a sensing medium with an interlocking structure, and meanwhile, can form a stable interface structure with the skin to ensure that the gel precursor is tightly attached to epidermal tissues, and motion artifacts caused by relative displacement in a motion process are reduced to the greatest extent. According to the invention, the electrode is formed by gelling the gel precursor on the skin surface, and the electrode has low interface impedance so as to ensure high signal fidelity, excellent mechanical stability, dynamic adhesion, stable electrochemical performance and biocompatibility, and can be reliably used for a long time. The method can be widely applied to wearable equipment, electronic skin, medical equipment and the like.

The invention discloses a xanthophyll-nicotinamide eutectic crystal and a preparation method and application thereof, the eutectic crystal is formed by xanthophyll and nicotinamide according to the molar ratio of 1: 1 through intermolecular interaction of hydrogen bonds, Van der Waals force and the like, and the molecular formula is C46H62N2O3. According to the invention, xanthophyll and nicotinamide are combined through a co-crystal technology, a novel co-crystal with good water solubility and high bioavailability is formed, and the solubility and absorption efficiency of xanthophyll are significantly improved.

The invention discloses a multi-network anti-freezing hydrogel electrolyte, a preparation method thereof and application of the multi-network anti-freezing hydrogel electrolyte in an electrochemical device. The hydrogel is prepared by using polyvinyl alcohol (PVA) and polyacrylamide (PAM) to form a basic network skeleton, introducing phytic acid, ethylene glycol and lithium / zinc bimetal salt (Li2SO4 / ZnSO4), and carrying out thermal initiation polymerization and freeze thawing. The hydrogel prepared by the invention has a multiple physical cross-linked network formed by polymer molecular chain entanglement, hydrogen-bond interaction among functional groups and metal coordinate bonds constructed between phosphate groups and divalent metal ions, so that the hydrogel electrolyte has excellent mechanical properties. Due to introduction of ethylene glycol, formation of ice crystals is effectively inhibited, and the hydrogel is endowed with excellent anti-freezing performance; the high-concentration Li < + > and Zn < 2 + > ensure the high ionic conductivity. The supercapacitor assembled by using the hydrogel electrolyte shows relatively high specific capacitance and good capacitance retention rate under bending and freezing conditions, and has good electrochemical properties and safety performance.

The invention relates to the technical field of pharmaceutical preparations, in particular to a preparation process of carbon dots for killing helicobacter pylori and application of the carbon dots in oral pharmaceutical preparations. The preparation method comprises the following steps: mixing microcrystalline cellulose and glycerol, freezing and crushing at an ultralow temperature, and selectively hydrolyzing by combining citric acid-malic acid mixed acid liquor to efficiently prepare a high-crystallinity cellulose nanocrystal template; the controllable synthesis of the carbon dots is realized by utilizing the hydrogen-bond interaction of hydroxyl / carboxyl on the surface of the cellulose nanocrystal and the nitrogen doping effect in the polymerization and carbonization process of citric acid and urea. Besides, when a sodium alginate-chitosan double-layer structure is constructed, carbon dots are introduced into the inner layer to endow the inner layer with special performance, a protein-polysaccharide network is formed on the outer layer through transglutaminase enzymatic crosslinking, and the oxidation resistance and mechanical strength are enhanced through secondary curing of tea polyphenol. According to the invention, food-grade raw materials are used for realizing high-efficiency antibiosis, the oral preparation safety specification is met, and the clinical transformation potential is realized.

The invention relates to the technical field of functional polymer materials and environmental pollution control, in particular to hydrogen bond self-assembled bio-based aerogel as well as a preparation method and application thereof. Quaternized chitosan and tannic acid are self-assembled in a water phase through hydrogen bonds and electrostatic interaction to form a three-dimensional network structure, no cross-linking agent or organic solvent is added, the specific surface area of the bio-based aerogel BET is 2-10 m / g, and through the strong electrostatic adsorption effect between cationic groups in the quaternized chitosan and anionic dye molecules (such as Congo red), the cationic groups in the quaternized chitosan and the anionic dye molecules (such as Congo red) are separated from the anionic dye molecules. The material shows excellent dye removal efficiency and adsorption capacity under the conditions of normal temperature and normal pressure and hydrogen bonds provided by rich phenolic hydroxyl groups in tannic acid molecules and a pi-pi accumulation effect, the aerogel can quickly adsorb anionic dye, the adsorption process is efficient, the selectivity is high, the structure is stable, and the aerogel is degradable and can be applied to the field of dye adsorption. And the method has good reproducibility and repeated use stability, and has wide practical application and popularization prospects.

The invention relates to a PVB (Polyvinyl Butyral) film for PDLC (Polymer Dispersed Liquid Crystal) dimming glass, a preparation method and the PDLC dimming glass, and belongs to the technical field of dimming glass. The PVB film for the PDLC dimming glass comprises PVB resin and a plasticizer, at least one end group of the plasticizer is a benzoate group, and the plasticizer belongs to benzoate. Through molecular structure design, the main chain of the plasticizer can be a polyether type [-CH2-CHY-O-] n chain segment or a polyol skeleton, and meanwhile, benzoate groups or specific end group structures (such as branched chain alkyl, aromatic hydrocarbon and the like) are introduced, so that the interaction (such as hydrogen bond damage, dipole interaction, pi-pi accumulation and the like) between the plasticizer and PVB resin is enhanced, and the plasticizer can be used for preparing PVB resin. By introducing structures such as branched chains and aromatic rings, the steric hindrance and rigidity of molecules are greatly improved, and migration and precipitation phenomena of the plasticizer in the PVB film are effectively inhibited.

Disclosed in the present invention are a gel having a regulatable free water content and morphology, a preparation method therefor, and the use thereof. The method comprises: S1, preparing a solution A from a natural polymer material; S2, mixing a small molecule material containing a positively charged polar group with the solution A to obtain a composite solution B; S3, mixing the composite solution B with a regulator to obtain a composite solution C, stirring same, then adding a condensing agent to the reaction system, and carrying out a curing crosslinking reaction; and S4, removing the regulator and the condensing agent to obtain the gel. By adjusting the concentrations of the natural polymer material and the regulator, gels having different morphologies can be prepared; the gel undergoes a physical process to remove hydrogen bond interaction between the gel and free water, so that the content of free water attached to the surface of the gel can be regulated, thereby regulating the physical and chemical properties of the gel. The gel of the present invention has regulatable morphology and controllable elastic modulus, and has many advantages such as good lubrication effect, good biocompatibility and biodegradability, capability of being biologically active, and capabilities of stimulating cell growth and accelerating wound repair.

The invention discloses a preparation method and application of a reproducible self-healing polyurethane elastomer with synergism of dynamic silicon oxygen bonds and multiple hydrogen bonds. The method comprises the following steps: (1) carrying out a pre-polymerization chain extension reaction on polytetrahydrofuran, isophorone diisocyanate and a catalyst; (2) adding a 3, 13-dihydroxy propyl octaphenyl double-layer silsesquioxane monomer to carry out a chain extension reaction, and then adding carbohydrazide to carry out a reaction; and (3) adding glycerol and camphorsulfonic acid, uniformly stirring, pouring into a mold, curing and drying, thereby obtaining the reproducible self-healing polyurethane elastomer with synergistic dynamic silicon-oxygen bonds and multiple hydrogen bonds. According to the invention, a common fabric is soaked in a dispersion liquid formed by uniformly mixing diluted polyurethane and hydrophobically modified MXene to obtain the multifunctional composite material with the functions of self-cleaning, self-repairing, photo-thermal conversion and human body sensing.

The invention discloses a high-strength and high-toughness liquid crystal elastomer and a preparation method and application thereof.The preparation method of the high-strength and high-toughness liquid crystal elastomer comprises the step that a sulfydryl-terminated liquid crystal oligomer, a rigid chain extender and a cross-linking agent react in the presence of a first catalyst and an optional first solvent, the high-strength and high-toughness liquid crystal elastomer is obtained. According to the high-strength and high-toughness liquid crystal elastomer disclosed by the invention, an effective solution is provided for realizing high strength and high toughness of the liquid crystal elastomer by introducing the rigid chain extender and a polyurethane structure hydrogen bond; the modulus and tensile strength of the liquid crystal elastomer are remarkably improved by a benzene ring rigid structure of the isocyanate-terminated chain extender; the multiplication of the hydrogen bond of the chain extender improves the strength of the material at room temperature on one hand, and on the other hand, the hydrogen bond is used as a sacrifice bond, an additional toughening mechanism is introduced again, and the liquid crystal elastomer has high strength and high toughness under the synergistic effect of multiple factors.

The invention discloses a gas separation mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas membrane separation. The mixed matrix membrane comprises a high polymer material matrix and a porous material, and through hydrogen-bond interaction formed by the high polymer material matrix and the porous material, the interfacial compatibility between a filler and the polymer matrix and the dispersity of the filler are remarkably enhanced; the pore material is used as a pore structure regulator, improves the chain accumulation mode of a polymer matrix and provides a selective gas separation window, and the gas screening capacity of the membrane is remarkably improved through the synergistic effect of the pore material and the pore structure regulator. The mixed matrix membrane is prepared by adopting a solution pouring method, the process is simple, the repeatability is high, large-area preparation is easy, the cost is low, the method is suitable for the fields of helium separation, hydrogen purification, natural gas purification, biogas purification and carbon capture, and the application prospect is wide.

The invention discloses an ionomer enhanced PA composite material and a preparation method thereof in the field of polyamide materials. The ionomer enhanced PA composite material comprises the following components in parts by weight: 70-80 parts of PA6, 20-30 parts of an ethylene-octylene copolymer, 1-3 parts of an enhancer, 0.02-0.05 part of an initiator and 0.05-0.1 part of an antioxidant. An ionomer reinforcing agent, ionic bonds and hydrogen bonds are added in a PA6 and POE system, so that the reinforcing agent and PA6 form a'synergistic stress network ', local stress concentration is reduced, strength is improved, 'strength-toughness-rigidity' synergistic improvement is achieved, an ionomer structure of the reinforcing agent is compatible with polar PA6 and a non-polar ethylene-octene copolymer at the same time, and the strength of the POE is improved. The phase separation defect is eliminated, and the material performance stability is high.

The invention discloses a surface defect and oxygen doping co-modified pore-rich g-C3N4 nano material as well as preparation and application thereof. The preparation method comprises the following steps: mixing a white viscous melamine-cyanuric acid suspension with an oxalic acid solution to obtain a melamine-cyanuric acid-oxalic acid suspension solution, carrying out hydrothermal treatment to obtain a hydrogen bond connected self-assembled supramolecular aggregate, and finally carrying out thermal polycondensation on the self-assembled supramolecular aggregate and formaldehyde to obtain the surface defect and oxygen doping co-modified porous g-C3N4. The surface defect and oxygen doping co-modified g-C3N4 nano material with different morphologies and physicochemical properties is obtained. The preparation method is simple in process flow, efficient, low in cost and suitable for large-scale production, and the synthesis process meets the green chemical requirement; the obtained nano material has a higher specific surface area and more active sites, and has higher catalytic reaction and adsorption performance on organic pollutants, namely levofloxacin, ciprofloxacin and tetracycline hydrochloride, in a water body.

The invention relates to the technical field of membrane separation, and discloses a polythiourea composite nanofiltration membrane as well as a preparation method and application thereof. The composite nanofiltration membrane comprises a bottom layer, a porous support layer and a polythiourea separation layer which are arranged in sequence, wherein the polythiourea separation layer comprises a structural unit A from polyamine and a structural unit B from a polyisothiocyano compound; wherein the structural unit A and the structural unit B are connected through a structure shown in a formula I, Ar1 is a residue obtained after a reaction of a compound containing polyisothiocyano groups, and Ar2 is a residue obtained after a reaction of polyamine. The separation layer structure of the polythiourea composite nanofiltration membrane contains C = S bonds, a large number of hydrogen bonds can be formed, the polythiourea composite nanofiltration membrane has excellent chemical stability, the structural stability of the composite nanofiltration membrane in a strong acid environment is remarkably improved on the premise that the separation performance of the composite nanofiltration membrane is guaranteed, and the acid resistance of the composite nanofiltration membrane is improved.

The invention provides a bio-based super-hydrophobic coating magnesium alloy material with anti-icing and corrosion-resistant functions as well as a preparation method and application of the bio-based super-hydrophobic coating magnesium alloy material. According to the material, a polylipoic acid-metal ion-hydrophobic carbon black coating is constructed on the surface of the pretreated magnesium alloy, so that the key problems that the corrosion rate of the magnesium alloy is high and the surface of the magnesium alloy is easy to freeze in practical application are solved. The coating is firmly combined with a matrix through multiple hydrogen bond effects, and the coating is endowed with rapid self-repairing capability by virtue of synergistic dynamic effects of disulfide bonds, hydrogen bonds and metal coordinate bonds. And meanwhile, the doped hydrophobic carbon black particles obviously improve the surface super-hydrophobic performance. The self-repairing characteristic is combined with the super-hydrophobic structure, so that corrosion medium infiltration is effectively blocked, and the corrosion process of the magnesium alloy is greatly delayed. In addition, the coating has photo-thermal and electrothermal effects, active anti-icing and efficient deicing can be achieved, and the application potential of the magnesium alloy in a severe environment is remarkably expanded.

The invention discloses an application of an ionic liquid in extraction of trioxymethylene, in the process of generating trioxymethylene by acid-catalyzed condensation of a formaldehyde aqueous solution, the ionic liquid is added as an extraction agent to extract and separate the trioxymethylene generated by reaction, and the ionic liquid is methyl tributyl phosphonium bis (trifluoromethanesulfonyl) imide salt; when the ionic liquid is used for extracting trioxymethylene, a ternary azeotropic system of trioxymethylene, water and methylene glycol can be broken, the ionic liquid and trioxymethylene are subjected to nonpolar Van der Waals' force interaction so as to realize extraction, and methylene glycol and water are left in a water phase through hydrogen-bond interaction, so that high-purity trioxymethylene with the purity of more than or equal to 99.5 wt.% is obtained.

The invention relates to the technical field of sewage treatment, in particular to a preparation method of a degradable bactericide for an oil field. According to the invention, a hydroxypropyl guanidine gum-polycaprolactone-ethylenediamine fragment copolymer is taken as a carrier, a methylisothiazolinone quaternary ammonium salt (Q-MIT) bactericide is loaded, and the degradable bactericide for the oil field is obtained by cooperating with a dodecyl ethyl sulfide (TC-SE) bactericide and combining with sodium polyaspartate. A carrier forms a hydrogen bond with a polar group on the surface of a biological membrane through a hydroxypropyl guanidine gum main chain to realize targeted anchoring, a polycaprolactone branched chain encapsulates Q-MIT through a hydrophobic effect, primary amino groups of ethylenediamine are introduced to form a pH sensitive Schiff base bond with Q-MIT, and the primary amino groups and adipic dihydrazide form a thermal response hydrazide bond to construct a dual dynamic covalent bond, so that controlled release of Q-MIT is realized, and the biomembrane is prepared. And moreover, the components of the whole system are connected through degradable chemical bonds, so that the environmental protection property and sustainability of oil field operation are guaranteed.

The invention relates to the technical field of lubricating oil, and discloses a low-temperature-resistant lubricating oil composition and a preparation method thereof. Mineral oil, modified polymethacrylate, a dispersing agent, an antioxidant and an oil defoaming agent are stirred and mixed and then filtered, and the low-temperature-resistant lubricating oil composition is obtained. The cross-linking agent enables polymethacrylate to form a light cross-linked structure, and stress can be dispersed during shearing; nitrogen atoms in triazinyl, pyridyl, pyrrolidone and Mannich base structures serve as hydrogen bond receptors, the hydrogen bond interaction with hydroxyl on a polymethacrylate molecular chain is enhanced, a physical cross-linked network is formed, and the shear resistance is further improved; in the modified low-temperature-resistant monomer, the glass-transition temperature can be remarkably reduced by high flexibility of silicon oxygen bonds in long straight-chain alkyl and silane groups, so that a molecular chain can still move at a low temperature, and the low-temperature fluidity of the lubricating oil is improved; the cyclic structure of cyclohexyl can effectively interfere with the ordered arrangement of wax crystals, reduce the pour point of the lubricating oil and improve the low-temperature fluidity.

A plasma cutting protection liquid, and a preparation method therefor, and a use thereof. The plasma cutting protection liquid comprises, in parts by mass: 8 to 40 parts of a water-soluble resin, 1 to 10 parts of a cosolvent, 0.1 to 8 parts of nanoscale inorganic particles, 0.5 to 3 parts of a flow promoter, 0.1 to 0.5 parts of an ultraviolet light absorber, and 50 to 100 parts of a solvent, wherein the water-soluble resin contains amide groups, and the water-soluble resin is a partially cross-linked resin. By using the partially cross-linked resin containing the amide groups, the partially cross-linked structure can form a three-dimensional network structure to inhibit molecular movement so as to improve the high-temperature resistance. The resin contains a large number of hydrophilic amide groups, which extremely easily form hydrogen bonds with water. After a cutting process is completed, a film layer formed by the protection liquid can be easily removed, and the cleaning process is simple. The inorganic particles can further improve the heat-resistant temperature of the cutting protection liquid and can also improve the compactness of the film layer, thereby facilitating the formation of a uniform film layer.

The invention provides a heterostructure salinity difference energy conversion film based on HOF / two-dimensional mesoporous carbon as well as a preparation method and application of the heterostructure salinity difference energy conversion film. The salinity difference energy conversion film comprises a two-dimensional mesoporous carbon layer serving as a hydrophobic layer and a hydrogen bond organic framework layer which covers one surface of the hydrophobic layer and serves as a hydrophilic layer, wherein the two-dimensional mesoporous carbon layer is formed by compounding a two-dimensional mesoporous carbon material with regular nanopores and aramid nanofibers; the hydrogen bond organic framework layer is formed by compounding a hydrogen bond organic framework material and aramid nanofibers; the heterogeneous Janus structure salinity gradient energy conversion membrane is constructed by adopting a hydrogen bond organic framework and a two-dimensional mesoporous carbon material, and when the heterogeneous Janus structure salinity gradient energy conversion membrane is applied to salinity gradient energy conversion, high ion selectivity, high structural stability and high ion migration flux can be considered.

The invention relates to a composite solid electrolyte and a preparation method thereof, the composite solid electrolyte comprises: a lithium zirconium phosphate (LZP) oligomer: a chain nanocluster with a polymerization degree of 5-10, the surface of which is modified by trimethyl phosphate (TMP) to form a phosphate group; a polymer matrix, namely PVDF-HFP; the lithium salt is lithium bis (trifluoromethanesulfonimide) LiFSI or LiDFOB, and the molar ratio of the lithium salt to the polymer repeating unit is (1: 8)-(1: 12); wherein the LZP oligomer and a-CF2 group of the PVDF-HFP form a hydrogen bond through a phosphate group of the TMP, and the LZP oligomer and the-CF2 group of the PVDF-HFP interact with each other through a dipole, so that molecular-level interface bonding is realized; the LZP oligomer constructs a continuous three-dimensional ion channel in the electrolyte, and the dielectric constant is 60-80; the electrolyte forms a film at 60 DEG C or below by a solution casting method.

The invention discloses a preparation method of an aronia extract and an application of the aronia extract in protecting an intestinal barrier function, and belongs to the technical field of natural product extraction. The method comprises the following steps: mixing a hydrogen bond acceptor and a hydrogen bond donor according to a molar ratio of 1: (1-3), heating, and continuously stirring to obtain a natural eutectic solvent; dissolving an enzyme in the natural eutectic solvent to obtain an enzyme solution; mixing the enzyme solution with the aronia fruit powder, and performing ultrasonic extraction, enzyme deactivation and purification to obtain the aronia extract. According to the method, a hydrogen bond donor in a natural eutectic solvent is comprehensively utilized to improve the stability and solubility of anthocyanin in a system, and the good regulation and control capability and molecular complexing stability of hydrogen bond receptor natural quaternary ammonium salt; the method is superior to a traditional method in the aspects of extraction rate, environmental friendliness and raw material availability, the content of the extracted effective components is increased by nearly two times or more, and the method is suitable for high-value utilization of anthocyanin-rich natural resources represented by aronia.

The invention relates to a high-performance positively charged composite membrane and a preparation method thereof, in particular to a nanofiltration membrane containing a sulfonated imino covalent organic framework (TpPa-SO3H) interlayer. The nanofiltration membrane adopts a three-layer structure design, and comprises a base membrane layer, a TpPa-SO3H middle interlayer and a positively charged separation surface layer. Wherein the TpPa-SO3H interlayer is formed by in-situ growth of polyphenol and sulfated amine under the action of an oxidizing agent, and the separation surface layer is assembled and constructed through electrostatic attraction and hydrogen-bond interaction between positively charged polyelectrolyte and sulfonic acid groups. The TpPa-SO3H interlayer is introduced to effectively regulate and control the pore size distribution and hydrophilicity of the surface of the substrate, the formed negative electricity interlayer can promote the assembly of a polyelectrolyte positive electricity layer, and the interception performance and the operation stability of the composite membrane on heavy metal cations are remarkably improved. Compared with a traditional nanofiltration membrane, the composite membrane prepared through the method keeps high water flux (larger than or equal to 40 L.m <-2 >. H <-1 >. Bar <-1 >), meanwhile, the rejection rate of heavy metal cations such as Cr < 3 + >, Mn < 2 + > and Co < 2 + > is larger than or equal to 95%, and the composite membrane has excellent long-term operation stability. The preparation method is simple in process and low in cost, and has a wide application prospect in the field of heavy metal wastewater treatment.

The invention belongs to the technical field of high polymer materials and electric power engineering protection, and particularly relates to an MPP power cable protection pipe containing a rare earth anti-aging system and a preparation method of the MPP power cable protection pipe. The protection tube is composed of rare earth coordination modified polypropylene, N, N '-bis (2-hydroxyethyl) adipamide, an antioxidant 1010, a light stabilizer 622, a hindered amine light stabilizer 944, a lubricant and an anti-ultraviolet absorbent. Rare earth ions and polypropylene grafted maleic anhydride form a stable coordination structure, small organic molecules enhance interface bonding through hydroxyl and acylamino hydrogen bonds, and multi-point stability of molecular chains is achieved. The thermal oxidation resistance, ultraviolet aging resistance and thermal deformation resistance of the material are remarkably improved, and the prepared cable protection tube has excellent mechanical strength, heat resistance and long-term weather resistance.

The application belongs to the field of polymer materials and power engineering protection technology, and particularly relates to a MPP power cable protection pipe containing a rare earth anti-aging system and a preparation method thereof. The protection pipe is composed of rare earth coordination modified polypropylene, N,N'-bis(2-hydroxyethyl)adipamide, antioxidant 1010, light stabilizer 622, hindered amine light stabilizer 944, lubricant and ultraviolet absorption agent. Rare earth ions and polypropylene grafted maleic anhydride form a stable coordination structure, and organic small molecules enhance the interface combination through hydrogen bonds of hydroxyl and amide groups, so that the molecular chain is stably connected at multiple points. The application significantly improves the thermal oxidation resistance, ultraviolet aging resistance and thermal deformation performance of the material, and the prepared cable protection pipe has excellent mechanical strength, heat resistance and long-term weather resistance.

The invention relates to the technical field of wave-absorbing coatings, and discloses a radar wave-absorbing coating and a preparation method thereof.The radar wave-absorbing coating is prepared from, by weight, 100 parts of waterborne polyurethane emulsion, 0.4-1.6 parts of graphene oxide, 0.3-2 parts of modified ferroferric oxide and the like; a plurality of hydrophilic hydroxyl groups and carboxyl groups are introduced on the surface of the nano ferroferric oxide, so that the surface hydrophilicity is improved, and the nano ferroferric oxide is uniformly dispersed in the waterborne polyurethane coating, so that the coating has higher mechanical strength and tensile property. And a plurality of hydroxyl groups and carboxyl groups introduced on the surface of the nano ferroferric oxide and hydroxyl groups and carboxyl groups on the surface of the graphene oxide interact with each other to form hydrogen bonds and the like, so that the interface action between the nano ferroferric oxide and the graphene oxide is improved, the impedance matching performance of the nano ferroferric oxide and the graphene oxide is improved, the interface polarization effect is formed, and the absorption effect of the coating on electromagnetic waves is improved.

The invention discloses a biomass-based thermal insulation coating as well as a preparation method and application thereof, and belongs to the technical field of thermal insulation materials. The heat-insulating coating is composed of a biomass-based supramolecular adhesive and a heat-insulating filler; the adhesive is formed by synergistic crosslinking of lipoic acid and tannic acid through dynamic covalent bonds and multiple hydrogen bonds, and the adhesive strength higher than 1.0 MPa can be provided; the heat insulation filler is a hollow glass bead system with optimized particle size and true density. The core of the invention lies in that a tough and dynamic supramolecular network formed by the biomass-based adhesive not only endows the coating with excellent interface bonding force and mechanical stability, but also can cooperatively construct a more efficient thermal barrier structure through tight compounding with a multi-scale thermal insulation filler, so that the heat conductivity coefficient of the coating can be as low as 0.03 W / (m.K). The coating has the comprehensive advantages of being environmentally friendly and efficient in heat insulation, and is suitable for the field with double strict requirements for reliability and heat insulation.