21388 results about "Macromolecule" patented technology

The invention discloses high-toughness ultra-high performance concrete and a preparation method thereof, and relates to the technical field of polymer modified materials thereof. The concrete is composed of a cementitious material composite system, a fiber-reinforced system and a polymer modifier, the cementitious material comprises Portland cement, nano-silica, a rice hull ash-based auxiliary cementitious material and gradient grading quartz powder, and the fiber system adopts steel fiber / basalt fiber / polypropylene fiber multi-scale composite reinforcement. And a polyurethane emulsion interface modifier is matched. During preparation, a dry mixing-fiber dispersion-wet mixing three-stage process is combined with a microfluidization emulsification and segmented polymerization technology, so that uniform dispersion of fibers and matrix-fiber interface reinforcement are realized. The scheme has high strength, high toughness and industrial feasibility, and is suitable for harsh engineering scenes such as bridge joints and explosion-proof structures.

The invention discloses spherical aluminum oxide and a silicone rubber heat conduction composite material thereof, and belongs to the technical field of functional polymer materials. The spherical aluminum oxide is subjected to surface modification through an amphiphilic fluorosilicone heat conduction interface synergist; comprising the following raw materials in parts by weight: 100-200 parts of vinyl silicone oil, 1-6 parts of side hydrogen-containing silicone oil, 1-6 parts of end hydrogen-containing silicone oil, 0.2-2 parts of a platinum catalyst, 0.01-0.1 part of an inhibitor and 2500-6000 parts of amphiphilic fluorine-silicon heat-conducting interface synergistic spherical aluminum oxide powder. Through surface modification of spherical aluminum oxide, the prepared silicone rubber heat-conducting composite material realizes synergistic gain of heat conduction, insulation and flexibility, and can meet the requirements of multiple fields such as power battery pack heat dissipation gaskets, high-frequency circuit packaging and wearable equipment.

The invention discloses a submarine cable insulation multi-field aging prediction method and system, and relates to the technical field of material science and engineering. An existing model has the problems that parameter interaction effect analysis is insufficient, feature weight distribution is not scientific, a data standardization method is insufficient, and the capacity of capturing dynamic response and nonlinear aging behaviors is weak. The method comprises the steps of multi-physics field accelerated aging experiment design and data acquisition, key characteristic parameter screening through grey correlation analysis, support vector machine modeling and optimization, dynamic aging behavior evaluation and service life prediction and feedback adjustment. According to the technical scheme, aging behaviors are comprehensively captured through a multi-physics field cooperation experiment, key parameters are scientifically screened in combination with grey correlation analysis, a nonlinear relation is optimized through support vector machine modeling, long-term prediction precision is improved through dynamic feedback adjustment, and reliability is enhanced through quantitative life evaluation; the aging characteristics of the submarine cable insulating material in multiple physical fields are comprehensively and accurately reflected, and a scientific basis is provided for multi-dimensional evaluation of the aging performance of a high polymer material.

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 a layered drug-loading microneedle patch as well as a preparation method and application thereof. The preparation method of the layered drug-loading microneedle patch comprises the following steps: S1, dissolving a drug and a soluble high-molecular polymer in a solvent according to a mass ratio of (2: 1)-(1: 12) to form a needle tip solution, then filling a needle tip cavity of a microneedle mold with the needle tip solution, drying, and removing redundant drug residues on the surface to form a drug-loading needle tip layer; and S2, filling a mold containing the drug-loading needle tip layer with a photocurable polymer, performing ultraviolet curing for 10-30 seconds under the wavelength of 365-405 nm, and then performing demolding to form a substrate layer, thereby obtaining the layered drug-loading microneedle patch. According to the method, one-time filling of the needle tip part is successfully achieved by combining needle tip auxiliary material proportion optimization, meanwhile, the curing process is rapid, the medicine utilization rate and the process stability are remarkably improved, the medicine stability is good, and the method is suitable for industrial production.

The invention discloses a pure bio-based PHA aqueous dispersion as well as a preparation method and application thereof, and belongs to the technical field of pure bio-based polymer aqueous dispersion. According to the dispersion, polyhydroxyalkanoate is used as a unique film forming matter, Pickering solid particles and a natural surfactant are adopted for synergistic stabilization, and a bio-based plasticizer can be selected. The emulsion or slurry with the polyhydroxyalkanoate content of 40-85wt% and the particle size of 0.2-3m is prepared through a melting high-pressure homogenization method, a low-temperature wet grinding method or a solvent replacement method. The coating does not contain petrochemical polymer protective colloid and perfluorinated and polyfluoroalkyl substances, and the bio-based content is greater than or equal to 99%. Due to the excellent stability, rheological property and film-forming property of the modified starch, the modified starch becomes an ideal basic material for constructing a multi-layer programmable controlled release and degradation functional coating system, can be used in the fields of paper-based barrier coatings, adhesives, advanced crop seed coats and the like, realizes excellent barrier, bonding and controlled release properties, meets the industrial compost and repulping property standards, and has wide application prospects. The method has green, environment-friendly and industrial potential.

A preparation method of a self-suspending proppant for hydraulic fracturing is characterized in that solid ceramsite is changed into a porous reinforced structure, a self-repairing function is introduced, bio-based macromolecules are adopted to replace a traditional surfactant, the environmental protection property is improved, nano-deposition and microwave technologies are introduced, the performance is improved, meanwhile, the energy consumption is reduced, and the compression resistance enhancement and self-repairing characteristics are newly added; and the method adapts to more complex stratum working conditions.

The invention discloses a preparation method of flame-retardant silicone rubber resistant to long-term thermal aging, and relates to the technical field of high-molecular compound composition anti-aging rubber. The flame-retardant silicone rubber is prepared from the following components in parts by mass: 75 to 100 parts of methyl vinyl silicone rubber raw rubber, 18 to 28 parts of fumed silica, 20 to 35 parts of aluminum oxide trihydrate, 0.5 to 3 parts of platinum flame-retardant synergist, 2 to 5 parts of heat-resistant additive, 1.5 to 2.5 parts of structured control agent, 1 to 2 parts of cross-linking agent, 2 to 10 parts of anti-aging agent and 8 to 13 parts of fluorinated silicone rubber. Through a synergistic flame-retardant system, the silicone rubber disclosed by the invention shows obvious advantages in flame-retardant capability, can reach a higher flame-retardant grade, effectively delays flame propagation, and reduces the risk of fire disasters. The weather resistance of the silicone rubber is remarkably improved due to the ultraviolet absorption function and the anti-oxidation function of the anti-aging agent, so that the silicone rubber can effectively resist ultraviolet rays and oxidation under the long-term outdoor solarization condition, and the performance reduction and the appearance deterioration are reduced.

The invention belongs to the technical field of high polymer material design and intelligent manufacturing, and discloses a machine learning driven epoxy resin based composite material thermal-mechanical property aided design method, which comprises the following steps: S1, data acquisition and feature construction; s2, performing feature screening; s3, constructing and training an interpretable prediction model; s4, carrying out reverse design and optimization; and S5, performing closed-loop verification and updating. According to the method, the quantitative relation of structure-process-performance is constructed through an interpretable machine learning model, and the contribution mechanism of each factor is revealed by means of SHAP analysis. And finally, reversely designing an optimal epoxy resin monomer structure and a matched curing process according to the performance target. The limitation of a traditional trial and error method is broken through, collaborative optimization of the material structure and the forming process can be achieved, and the development efficiency of the epoxy resin-based carbon fiber composite material is remarkably improved.

The invention discloses a polylactic acid injection molding mold based on a gradient heat conduction composite structure and a heat management method thereof, and belongs to the technical field of high polymer material molding processing equipment.The polylactic acid injection molding mold comprises a) a surface high heat conduction layer which is made of a copper-based composite material, has the heat conduction coefficient larger than or equal to 400 W / m.K and is used for rapidly and directionally transferring heat to the surface of a mold cavity; and b) an intermediate transition layer composed of a titanium alloy porous structure. High-efficiency production is realized through innovative design and advanced technology. Integrated metallurgical bonding of the gradient heat conduction structure is achieved through the selective laser melting technology, and the heat flow directivity is enhanced; the dual-mode cooling system is combined with closed-loop temperature control, and the temperature is accurately regulated and controlled; the high-performance material improves the comprehensive performance of the mold; and the structural stability is guaranteed through accurate technological parameters. According to the thermal management method, through multi-physical field simulation optimization, rapid heating and cooling are achieved, the forming period is shortened to 16-18 seconds, the calculation efficiency is improved by 80%, and the production efficiency and the product quality are effectively improved.

The invention discloses a multi-layer controllable degradation coating composition as well as a preparation method and application thereof, and belongs to the field of biodegradable high polymer materials and coating compositions. The coating composition comprises an outer protective layer and an inner functional layer, and the inner functional layer is arranged between a substrate and the outer protective layer and comprises a plurality of microcapsules. The key innovation lies in that the microcapsule encapsulates an enzyme capable of catalytically degrading the outer protective layer and is configured to be released after a predetermined delay time. The pH buffer system is integrated in the inner functional layer, and an optimal catalytic microenvironment is created for released enzyme, so that the outer protective layer is actively and quickly degraded, and programmable time-controlled removal is realized. The problem that the degradation rate of an existing biodegradable material is passive and uncontrollable is solved, and the coating has a remarkable application value in the field of seed coating or fertilizer controlled release by endowing the coating with a unique two-stage degradation characteristic.

The invention relates to the field of disposable hygienic products, in particular to a high-diffusion baby paper diaper and a preparation method thereof.The prepared baby paper diaper has the advantages of being good in flow guide effect and high in absorption efficiency. The absorption core layer comprises a top layer non-woven fabric, a middle non-woven fabric, a bulky non-woven fabric, a bottom layer non-woven fabric, a wood pulp fiber layer, a first absorption material layer and a second absorption material layer, the first absorption material layer comprises first polymer water-absorbent resin particles and first wood pulp fibers, and the second absorption material layer comprises second polymer water-absorbent resin particles. The second absorbing material layer is arranged between the bulky non-woven fabric and the bottom layer non-woven fabric, part of the second macromolecule water-absorbent resin particles on the second absorbing material layer are embedded in pores of the bulky non-woven fabric, and the first absorbing material layer is arranged between the bulky non-woven fabric and the middle non-woven fabric. And a part of the first high-molecular water-absorbent resin particles on the first absorbing material layer are embedded in pores of the bulky non-woven fabric.

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 high polymer materials, and particularly provides a self-repairing type UV curing alumite color layer coating and a preparation method thereof. The water-based ink is prepared from, by weight, 30-50 parts of polyurethane acrylic resin, 10-25 parts of modified acrylic oligomer containing dynamic covalent bonds, 2-5 parts of photoinitiator, 3-8 parts of hydrophobic modified nano filler and 1-3 parts of cross-linking agent, and the dynamic covalent bonds are selected from at least one of hydrazide bonds, boric acid ester bonds and Diels-Alder bonds. By introducing a gradient energy collaborative network of dynamic covalent bonds and quadruple hydrogen bonds, rapid self-repairing of the coating at normal temperature and thermal triggering recombination of deep damage are achieved, and meanwhile through the micro-phase separation design of the hydrophobic core-shell filler and the graft modified silicon carbide nanowires, the hydrolysis resistance is improved.

The invention relates to the technical field of high polymer material processing, in particular to an insulation board extrusion molding control method and system.The method comprises the steps that 1, multi-dimensional parameters are collected in real time, at least three detection sections are arranged on an outlet section of a die head of an extruding machine in the material flowing direction, and each section synchronously collects the following data; 2, evaluating the rheological state of the melt in real time; 3, dynamically reconstructing a temperature field, dividing the die cavity into an axial independent temperature control section and a circumferential heating unit, and dynamically adjusting the power of the heating unit according to a state judgment result in the step 2; 4, pressure-rotating speed cooperative compensation is carried out; and 5, closed-loop verification is carried out, the density uniformity of the formed plate is detected after the adjustment instruction is executed, and if the density range exceeds the limit, the step 2 is executed again. By accurately controlling the temperature and the concentration of the foaming agent, the feasibility of high-proportion mixing of the reclaimed material is optimized, the quality fluctuation caused by temperature and viscosity fluctuation is reduced, and green manufacturing, energy conservation and consumption reduction are promoted.

The invention relates to the technical field of high polymer materials, in particular to ethylene-vinyl acetate copolymer modified polypropylene high-toughness plastic particles and a preparation process thereof. The composite material is prepared from the following raw materials in parts by weight: 60 to 80 parts of polypropylene, 15 to 30 parts of ethylene-vinyl acetate copolymer, 5 to 10 parts of maleic anhydride-2-ethylhexyl acrylate copolymer grafted ethylene-vinyl acetate copolymer, 3 to 8 parts of nano silicon dioxide / graphene quantum dot composite filler, 5 to 12 parts of polyolefin elastomer, 0.5 to 2 parts of antioxidant and 0.5 to 2 parts of lubricant. The content of vinyl acetate in the ethylene-vinyl acetate copolymer is 20-33 wt%, the composite filler is modified through a silane coupling agent KH-560, the grafting rate of the grafted ethylene-vinyl acetate copolymer is 1.5-3.5 wt%, and the composite filler is prepared through a melt grafting method. Through multi-component collaborative design and process optimization, the low-temperature toughness, rigidity, heat resistance and aging resistance of the material are improved, the problems of rigidity and toughness imbalance, low-temperature brittleness, poor stability and the like of a traditional modification system are solved, and the material is excellent in comprehensive performance and wide in application range.

The invention discloses a scratch repair coating and a preparation method thereof, and relates to the technical field of high polymer materials. When the scratch repair coating is prepared, hydroxylated boron nitride reacts with 1-(3-triethoxysilylpropyl)-2-imidazoline to prepare pre-modified boron nitride, and then the pre-modified boron nitride and 4-chloro-1-butene are subjected to quaternization to prepare modified boron nitride; the preparation method comprises the following steps: reacting styryl phosphonic dichloride with 4, 4, 5, 5, 6, 6, 7, 7, 7-nonafluoro-1, 2-heptanediol to prepare a hydroxyl-terminated phosphorus-fluorine-containing polymer; the preparation method comprises the following steps: reacting isophorone diisocyanate with a hydroxyl-terminated phosphorus and fluorine-containing polymer to prepare a polyurethane prepolymer; reacting the polyurethane prepolymer with hydroxyl-terminated coumarin to generate modified polyurethane; and uniformly mixing the modified polyurethane, the modified boron nitride and a photoinitiator to prepare the scratch repair coating. The scratch repairing coating prepared by the invention has good self-repairing performance, flame retardant property, corrosion resistance and mechanical property.

The invention discloses a high-strength polyethylene film and a preparation method thereof, and relates to the technical field of high polymer materials. The invention discloses a high-strength polyethylene film. The high-density polyethylene composite material is prepared from the following raw materials in parts by weight: 35 to 45 parts of high-density polyethylene, 25 to 35 parts of linear low-density polyethylene, 12 to 18 parts of ethylene-vinyl acetate copolymer, 5 to 10 parts of nano silicon dioxide, 3 to 7 parts of organic montmorillonite, 1.5 to 3.5 parts of hindered amine light stabilizer, 1.5 to 2.5 parts of antioxidant 1010, 0.8 to 1.2 parts of calcium stearate, 0.8 to 1.2 parts of zinc stearate, 0.8 to 1.2 parts of silane coupling agent and 4 to 6 parts of maleic anhydride grafted polyethylene. The composite material is prepared from the following components in parts by weight: 1.5-3.5 parts of a quaternized chitosan-nano silver compound, 6-9 parts of a modified toughening agent, 4-7 parts of a modified heat-resistant agent, 1.5-3.5 parts of a processing aid, 0.15-0.35 part of dibenzoyl peroxide and 0.5-1.5 parts of a nucleating agent DBS. The composite material is excellent in comprehensive performance, high in strength, good in flexibility and puncture resistance, excellent in aging resistance, heat resistance, chemical resistance and antibacterial property, good in processability, capable of meeting the requirements of multiple fields such as packaging and agriculture, scientific in preparation method and high in practical value.

The invention provides a high polymer material performance prediction method based on deep learning, and relates to the technical field of material performance prediction.The method comprises the specific steps that variable parameters influencing high polymer material performance are determined, multiple sets of samples are prepared and subjected to a tensile test and an accelerated aging test, and initial and final tensile performance parameters are obtained; and constructing and training an initial performance prediction model and an aging performance prediction model based on a deep learning network model, inputting related parameters into the models to obtain performance parameters, generating an environment severe coefficient through data processing, calculating a performance evaluation index in combination with a tensile performance parameter variation, and comparing the performance evaluation index with a preset threshold value to evaluate the material performance. According to the method, the performance change of the aged material can be accurately predicted, the performance evolution can be reflected, the prediction result is closer to reality, the material performance can be comprehensively evaluated, and an effective reference and a scientific basis are provided for long-term use, selection and application of the material.

The invention relates to the technical field of lithium battery polymer solid electrolyte materials, and discloses a high-pressure-resistant in-situ polymerization quasi-solid electrolyte membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out esterification reaction on bacterial cellulose and 2-bromoisobutyryl bromide to obtain bromine-modified bacterial cellulose, grafting a double-block polymer side chain on the surface of the bromine-modified bacterial cellulose to obtain a one-dimensional polymer brush, and preparing a one-dimensional polymer brush film; a one-dimensional polymer brush film is used as a supporting film, an in-situ polymerization precursor solution is dropwise added to the surface of the supporting film, and the high-pressure-resistant in-situ polymerization quasi-solid electrolyte film is obtained through in-situ ring opening polymerization. The prepared high-pressure-resistant in-situ polymerization quasi-solid-state electrolyte membrane has excellent mechanical performance, the thickness of polymer electrolyte can be reduced, and growth of lithium dendrites can be inhibited; the rich pore structure is beneficial to rapid transmission of lithium ions; and the block in the side chain is beneficial to lithium ion transmission and lithium metal uniform deposition, and improves the stability of the electrolyte membrane in a high-voltage environment.

The invention provides a PHA dispersion emulsion as well as a preparation method and application thereof, and belongs to the field of high polymer materials. The invention aims to solve the technical problem that the prior art cannot simultaneously meet the requirements of the polyhydroxyalkanoate water dispersion system on extremely low temperature natural film-forming property, excellent comprehensive performance after film formation and long-term storage stability. The method is characterized in that a polyhydroxyalkanoate polymer with specific molecular weight and polydispersity index range, a coalescing agent 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate with a specific chemical structure and a specific type of aliphatic polyisocyanate cross-linking agent compatible with water dispersion are strictly limited and combined. Through the synergistic effect generated by the unique ternary combination, the minimum film forming temperature of the prepared emulsion can be reduced to 6-10 DEG C, a film can be naturally formed without hot pressing, and the formed film has excellent mechanical property, water resistance and adhesive force and has excellent storage stability of at least one year.

The invention discloses an immunoregulation hydrogel as well as a preparation method and application thereof, and relates to the technical field of medical materials, amino-derived cationic polysaccharide, carboxyl-derived anionic polysaccharide and dopa-modified protein biopolymer materials are used as biological matrix materials, spermidine is used as a bioactive functional component, and the immunoregulation hydrogel is prepared by a one-step method. The preparation method comprises the following steps: by taking a benzaldehyde-terminated high polymer material as a cross-linking agent, forming a first layer of dynamic reversible cross-linked network structure through Schiff base reaction; then calcium ions are introduced, and the calcium ions and carboxylate radicals are complexed and cross-linked to form a second layer of static irreversible cross-linked network structure which can be used for an ESD (Electro-Static Discharge) operation. By adopting a step-by-step cross-linking mode, the first-step cross-linked single-network hydrogel has injectability, self-repairability, tissue adhesiveness and an immune regulation function, and the second-step cross-linking further ensures stable and lasting performance, so that the problems that a submucosal injection material is easy to disperse, short in lasting time and poor in stability are solved. The immunoregulation function effect of the wound repair material is poor.

The invention discloses a solvent-resistant foaming material and a preparation method thereof, and relates to the technical field of high-molecular compound rubber foaming materials. The solvent-resistant foaming material is prepared from the following raw materials in parts by mass: 90 parts of a basic polymer, 5-25 parts of a chemical foaming agent, 0.5-5 parts of a cross-linking agent, 0.5-8 parts of a foaming aid, 5-40 parts of filler, 10-30 parts of a solvent-resistant modifier, 0.5-5 parts of a processing aid and 0.5-1.5 parts of an anti-aging agent. Through the synergistic effect of the base polymer (the nitrile rubber and the butadiene rubber are mixed according to the ratio of 1: 1) and the solvent-resistant modifier (such as polytetrafluoroethylene powder), the problem that a traditional foaming material is easy to swell and deform in an organic solvent environment is solved. On the trend, the volume swelling rate and the mass change of the material in a solvent are effectively reduced, the infiltration resistance is enhanced, the structural integrity of the material is kept when the material is in contact with lubricating oil or an alcohol solvent for a long time, and therefore the service life of a sealing piece is prolonged.

The invention discloses an environment-friendly high-strength water-stop belt and a preparation method thereof, and relates to the technical field of high-molecular compound composition water-stop belts. The environment-friendly high-strength water-stop belt is prepared from the following components in parts by mass: 100 parts of ethylene propylene diene monomer, 40 to 70 parts of reinforcing filler, 10 to 25 parts of environment-friendly plasticizer, 1 to 5 parts of interface modifier, 1.5 to 3.5 parts of vulcanizing agent, 3 to 8 parts of active agent, 1 to 3 parts of anti-aging agent and 5 to 15 parts of flame retardant. White carbon black and calcium carbonate are adopted as reinforcing filler to replace traditional carbon black, and energy consumption and pollution emission in the production process are remarkably reduced. By optimizing the formula and the preparation process, the tensile strength, the elongation at break, the tearing strength and other mechanical properties of the waterstop are remarkably improved. Aluminum hydroxide is added as a flame retardant, absorbs heat during thermal decomposition and forms a barrier layer, so that oxygen is effectively diluted, and fire spreading is prevented.

The invention discloses a low-temperature-resistant PVC / SEBS modified material and a preparation method thereof, and belongs to the technical field of high polymer materials. The PVC / SEBS modified material comprises the following raw materials in parts by weight: 80-100 parts of PVC, 20-40 parts of SEBS, 5-20 parts of a plasticizer, 6-10 parts of a cold-resistant agent, 2-4 parts of a flame retardant, 5-8 parts of an anti-aging agent, 2-3 parts of a stabilizer and 3-5 parts of a lubricant. The PVC / SEBS modified material prepared by the invention has excellent cold resistance.

The invention belongs to the technical field of flame-retardant macromolecules, and particularly relates to intrinsic heat-conducting flame-retardant recycled epoxy resin and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out a reaction on diethanol amine and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) to obtain an intermediate A; and (2) carrying out condensation polymerization on the intermediate A and phenylphosphonic acid to prepare the phosphate-terminated polyester flame retardant (PEF). And (3) carrying out epoxidation on 4, 4 '-biphenol to prepare the liquid crystal epoxy precursor LEP. And (4) mixing PEF, LEP and 3, 3 '-dithiodipropionic acid, and heating and curing to prepare the epoxy resin. The prepared epoxy resin has intrinsic heat conduction, flame retardance and efficient recoverability, and is a high polymer material with great potential.

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 discloses a micro proportional valve gradient composite coating and a preparation method thereof, and belongs to the technical field of micro proportional valve surface strengthening manufacturing. Aiming at the corrosion-resistant and wear-resistant requirements of the micro proportional valve under the working conditions of strong corrosion, multiple impurities and high pressure difference, the interface strengthening and corrosion-resistant and wear-resistant performance optimization of a metal matrix and a functional coating are combined, and metal / ceramic / polymer gradient material design, spraying parameter suitability research and a coating porosity / bonding strength control method are covered; the valve core and valve seat protection device is suitable for high-efficiency protection technical systems of valve cores and valve seats of precise instruments such as gas chromatographs and mass spectrometers.

The invention belongs to the technical field of biomedical materials, and particularly relates to adipose-derived mesenchymal stem cell loaded conductive hydrogel and a preparation method and application thereof, the preparation method comprises the following steps: step S1, after hyaluronic acid is subjected to oxidation treatment, dopamine is grafted to oxidized hyaluronic acid, and oxidized hyaluronic acid-dopamine is obtained; step S2, carrying out amination treatment on gelatin to obtain aminated gelatin; s3, mixing the oxidized hyaluronic acid-dopamine with the aminated gelatin, and carrying out Schiff base crosslinking, so as to obtain hydrogel; and step S4, loading the adipose tissue-derived stromal cells by using the hydrogel. Dopamine is grafted on an oxidized hyaluronic acid macromolecular chain through amidation reaction, the hydrophilicity and the electrical property of the macromolecular chain are improved, a catechol structure is provided to provide possibility for iron ion coordination, the tissue adhesion, the injectability, the mechanical property and the electrical conductivity of the hydrogel are improved, and the hydrogel can be applied to the field of biomedical materials. After being applied to a spinal cord injury rat model, the functional recovery can be promoted.

A nasal spray device comprises a non-pressurized reservoir for containing a liquid formulation; a spray nozzle; and a manually energizable pump, configured to pressurize a quantity of said liquid formulation and causing the liquid formulation to move through the spray nozzle such that the liquid formulation is discharged from the spray nozzle as an aerosol spray. The spray nozzle comprises a membrane having a plurality of micropores of a substantially identical size below 8 micron and beyond 3 micron through which the liquid formulation passes as the liquid formulation is discharged from the device. Said membrane is configured to release said dose of said liquid formulation in a period of at least 500 milliseconds as a conically shaped plume having an apex. An energy of less than 20 Joule / gram is being dissipated in the liquid to preserve the molecular integrity of macromolecules within the liquid.