843 results about "Molecular materials" patented technology

The invention discloses a high-weather-resistance halogen-free flame-retardant polyamide composite material and a preparation method thereof, and belongs to the technical field of high polymer materials. The composite material comprises the following raw materials in parts by weight: 20-60 parts of polyamide resin A, 0-20 parts of polyamide resin B, 10-50 parts of glass fibers, 0.1-2 parts of an ultraviolet absorbent, 0.1-2 parts of a free radical scavenger, 10-20 parts of a halogen-free flame retardant, 1-15 parts of a flame retardant synergist and 0.5-5 parts of a conventional auxiliary agent. The preparation method comprises the following steps: uniformly mixing the polyamide resin A, the polyamide resin B, the ultraviolet absorbent, the free radical scavenger, the flame-retardant synergist and the conventional auxiliary agent in a high-speed mixer according to the proportion to obtain a mixture, then adding the mixture into a double-screw extruder through main feeding, side feeding of the halogen-free flame retardant through a first side feeding and side feeding of the glass fiber through a second side feeding, and carrying out extrusion molding to obtain the flame-retardant polyamide composite material. And carrying out melt blending and extrusion granulation to obtain the high-weather-resistance halogen-free flame-retardant polyamide composite material. The obtained high-weather-resistance halogen-free flame-retardant glass fiber reinforced polyamide composite material is excellent in mechanical property, flame retardance and weather resistance.

The invention relates to a special engineering plastic polyethersulfone microcellular foam material and a preparation method thereof, belongs to the technical field of high polymer material foaming, and solves the problem that high foaming ratio, a microcellular structure and excellent mechanical properties cannot be simultaneously obtained when a macromolecular polyethersulfone material adopts an injection foaming technology in the prior art. The method comprises the following steps: step 1, pretreating raw materials; 2, melt blending: mixing the PES base material, the second component, the functional filler, the cross-linking agent and the foam stabilizer, carrying out melt blending, granulating, and drying to obtain granules; 3, injection foaming: injecting the granules into an injection machine, adding a composite foaming agent into the injection machine, mixing, and performing injection foaming molding to obtain an injection-molded foaming material; and 4, curing: irradiating the injection-molded foam material with rays to obtain the special engineering plastic PES microcellular foam material.

The utility model relates to the field of high polymer materials, in particular to a polyaryletherketone resin pre-impregnated line material winding and forming device which is used for preparing polyaryletherketone resin pre-impregnated line materials and comprises a translation table top, a material impregnating groove, a guide column and a tensioning pulley. According to the present invention, with the structural design such as a driving system and the like, the carbon fiber can be immersed in the polyaryletherketone resin at low cost and high efficiency to obtain the sheet-shaped prepreg, the sheet-shaped prepreg is subjected to hot pressing to form the polyaryletherketone resin-based composite material of the fiber fabric, and the composite material has characteristics of excellent strength, wide application, and easy promotion and application. Wide application prospects are realized in the fields of aviation, aerospace equipment and high-end civil use.

The invention discloses a degradable express bag material and a preparation method thereof, and relates to the technical field of high polymer materials. The invention discloses a degradable express bag material. The composite material is prepared from the following raw materials in parts by weight: 40 to 50 parts of poly (butylene adipate-co-terephthalate), 20 to 30 parts of polycaprolactone, 5 to 8 parts of modified bamboo fiber, 2 to 4 parts of modified nano montmorillonite, 3 to 6 parts of tributyl citrate, 0.1 to 0.3 part of antioxidant 1076, 1 to 2 parts of iron dithiocarbamate master batch, 2 to 3 parts of maleic anhydride grafted poly (butylene adipate-co-terephthalate) and 0.3 to 0.6 part of zinc stearate. 0.1 to 0.3 part of baicalein; and 1 to 3 parts of chitosan-sorbitol composite coating liquid. According to the degradable express bag material, poly (butylene adipate-co-terephthalate) and polycaprolactone are used as main degradable raw materials, modified bamboo fibers and modified nano-montmorillonite are matched to enhance the mechanical property, an antioxidant 1076, baicalein and the like are added to guarantee the stability and functionality, temperature is accurately controlled in the preparation process, multi-step modification is adopted for optimizing component combination, and the degradable express bag material is prepared. The performance is improved through the composite coating, degradability is achieved, and good usability is achieved.

The invention discloses a carbon fiber-glass bead synergistically reinforced PA56 / PPO composite material and a preparation method thereof, and relates to the technical field of high polymer materials. The PA56 / PPO composite material comprises the following components in percentage by mass: 20%-40% of PA56 resin, 20%-30% of PPO resin, 20%-40% of modified carbon fibers, 10%-20% of silane modified glass beads, 0.5%-5% of a toughening agent and 0.5%-5% of a compatilizer. Through compound use of the modified carbon fibers and the silane modified glass beads, the addition amount of a single carbon fiber material can be reduced, and weight reduction is realized while the cost is reduced; the toughening agent has good compatibility with matrix resin and can generate a better toughness modification effect after being added into a PA56 / PPO system, and the added compatilizer can improve the interfacial effect among the components so as to effectively improve the mechanical properties and antistatic properties of the composite material. The carbon fiber-glass bead synergistically reinforced PA56 / PPO composite material provided by the invention is balanced in rigidity, toughness and antistatic property, and can be used in automotive electronic and electrical products with requirements on high strength, high toughness and antistatic property.

The invention relates to microcapsule phase change cooling liquid and a preparation method thereof, and belongs to the technical field of high polymer materials. The microcapsule phase change cooling liquid comprises the following components in parts by weight: 40-55 parts of ethylene glycol, 30-45 parts of deionized water, 5-14 parts of a core material, 3-6 parts of a wall material, 0.1-0.4 part of a dispersion stabilizer, 0.1-0.4 part of a corrosion inhibitor and 0.1-0.4 part of a modified antirust agent, the microcapsule phase change cooling liquid prepared by the invention not only has a good cooling effect, but also has excellent rust-proof and flame-retardant effects.

The invention discloses a recycled modified polypropylene composite material preparation system and a resource recovery method, and relates to the technical field of high polymer material science and engineering. The raw material pretreatment module adopts near infrared spectrum classification, multi-stage cleaning, drying and crushing, and the moisture content is controlled to be less than 0.5%; the melt blending module melts the materials at 180-220 DEG C, modifiers and additives are added, and vacuum degassing is performed to remove impurities; adding a reinforcing agent into the modification reinforcing module, and performing ultrasonic dispersion and dynamic vulcanization; the molding processing module is used for manufacturing a product through extrusion, injection molding or calendaring; the quality detection module is used for detecting mechanical and thermal properties; the waste recovery module is used for crushing and melting granulation to realize a closed loop; the intelligent control module uses a PLC to coordinate each module. Integrated treatment of waste polypropylene is achieved, the purity of raw materials and the performance of a composite material are improved, the resource utilization rate is increased through closed-loop recycling, manual intervention is reduced through intelligent control, product stability is guaranteed, economic and environment-friendly benefits are achieved, and high-valued circulation of waste plastic is promoted.

The invention relates to the field of high polymer materials, and particularly discloses a high-oxygen-barrier moisture-barrier PE film and a process. The high-oxygen-barrier moisture-barrier PE film comprises a corona layer, a barrier layer and a heat sealing layer which are connected in sequence, the barrier layer comprises the following raw materials in parts by weight: 90-95 parts of polyethylene and 5-10 parts of polyvinylidene chloride, and the heat sealing layer is made of a polyethylene material; in addition, the preparation method provided by the invention has the advantages that the oxygen and moisture resistance of the polyethylene single film is improved, and meanwhile, the printing requirement is met.

The invention discloses a low-dielectric-constant polyamide material, and relates to the technical field of high polymer materials. The invention discloses a low-dielectric-constant polyamide material. The composite material is prepared from the following raw materials in parts by weight: 35 to 45 parts of polyamide 66, 5 to 10 parts of polytetrafluoroethylene micro powder, 8 to 12 parts of modified porous siloxane microspheres, 3 to 7 parts of modified nano zinc oxide, 10 to 15 parts of glass fibers, 4 to 8 parts of polyether-ether-ketone, 1 to 3 parts of graphene nanosheets, 3 to 5 parts of fluororubber, 1 to 2 parts of a titanate coupling agent, 0.3 to 0.7 part of an antioxidant 1010, 0.5 to 1.0 part of ethylene bis stearamide and 0.1 to 0.3 part of an ultraviolet absorbent UV-531. The low-dielectric-constant polyamide material has the remarkable advantages that the raw materials are scientifically proportioned, and various modified components are contained to enhance the performance; all the components are subjected to special treatment, so that the compatibility is good; the preparation process is rigorous, and the material has excellent dielectric properties; and the material also has good heat resistance and weather resistance and strong mechanical properties, and is suitable for various scenes with high dielectric constant requirements.

The invention discloses SIS (styrene-isoprene-styrene) containing dynamic reversible bonds and a preparation method thereof, and belongs to the technical field of high polymer materials. The copolymer is prepared through a Diels-Alder reaction with bismaleimide on the basis of a polystyrene construction unit with two tail ends capped with furan and a polyisoprene construction unit module with two tail ends capped with furan. Wherein the DA bond has a thermal reversible characteristic. The furan end-capped building unit module with controllable molecular weight and narrow distribution is prepared, and reversible connection and dissociation of blocks are realized through a modularization strategy. According to the invention, an inverse Diels-Alder reaction can be carried out at 120-140 DEG C, and is dissociated into an original construction unit module, so that the proportion of soft and hard segments of a copolymer is changed by supplementing a specific construction unit feeding amount and carrying out the Diels-Alder reaction again; the SIS has the advantages of being accurate in structure and designable in performance at the same time, flexible regulation and control over the block proportion are achieved through the SIS containing the dynamic reversible bonds, and meanwhile the SIS has wide application prospects in the fields of recyclable adhesives, intelligent packaging, flexible electronics and the like.

The invention discloses a high-CTI (comparative tracking index) halogen-free flame-retardant PA66 (polyamide 66) composite material and a preparation method thereof, and belongs to the technical field of high polymer materials. The composite material comprises the following components in parts by weight: 52-64 parts of PA66 resin, 20-30 parts of glass fibers, 12-15 parts of a phosphorus-based flame retardant, 0.5-1.5 parts of a flame-retardant synergist, 0.3-0.7 part of a lubricant and 0.1-0.5 part of an antioxidant, and the flame-retardant synergist is aliphatic dicarboxylic acid with the carbon atom number greater than or equal to 8. The material surface energy is reduced and electrolyte is repelled through long-carbon-chain hydrophobic groups, and meanwhile, the CTI value is increased to 600 V or above while it is guaranteed that the material reaches the UL94 V0 flame retardant grade (1.6 mm) by utilizing interaction of carboxyl and a PA66 matrix and cooperating with a phosphorus flame retardant. The invention also provides a preparation method of the material, the process is simple, the material is suitable for industrial production, and the product can be widely applied to electronic and electrical components with high safety requirements.

The invention discloses an AI-driven polymer composite material process optimization method, and aims to solve the problems of data islands, process optimization lag and insufficient model timeliness in a polymer material production process. The method comprises the following steps: collecting full-link data according to a six-level customer product coding specification; the state parameters of the high-frequency equipment are safely stored in the sub-table 1 through encryption and identity authentication; constructing a structured database based on the production batch number association main table, the raw material sub-table set, the sub-table 2 and the sub-table 3; training a multi-model artificial intelligence system fusing gradient boosting regression, Bayesian optimization, a neural network and a random forest, and realizing a bidirectional linkage closed loop of formula recommendation, process optimization and performance prediction; and incremental learning is carried out by adopting a sliding window mechanism in combination with an online gradient descent and elastic weight consolidation strategy. According to the technical scheme, intelligent, efficient and safe optimization of the high polymer material process can be achieved, and the product quality and the production efficiency are remarkably improved.

The invention provides a high-strength corrosion-resistant CPVC plate and a preparation method thereof, and belongs to the technical field of high polymer materials, the preparation method comprises the following steps: S1, preparing Si-MBS; s2, mixing CPVC resin powder, Si-MBS, chlorinated polyethylene, a stabilizer, a processing aid, a lubricant and a coupling agent-hollow microsphere, melting, plasticizing, extruding, calendaring to form a plate, and cooling and shaping to obtain a CPVC base material; and S3, spraying the coating slurry containing ZIF-67 / GO-coated BTA / PEI powder on the surface of the CPVC base material, vacuumizing, and curing to obtain the high-strength corrosion-resistant CPVC plate. The overall strength and impact resistance can be improved, and meanwhile the overall corrosion resistance is improved.

The invention relates to the technical field of screen production, in particular to a double-sided composite reinforced printing screen and a manufacturing method thereof. Weaving metal wires to obtain screen cloth, and fixing the screen cloth on a screen frame; coating the bottom surface of the screen cloth with a high polymer material to form a first high polymer material layer on the screen cloth; etching the first high polymer material layer in a laser etching mode to form an opening pattern; coating a PI composite material on the top surface of the screen cloth to obtain a PI layer; coating the front surface of the PI layer with a high polymer material to form a second high polymer material layer; the second high polymer material layer is etched in a laser etching mode, the double-sided composite reinforced printing screen is obtained, the first high polymer material layer and the second high polymer material layer are additionally arranged, screen point position abrasion caused by the downward pressing pressure and the depth of a scraper is avoided, and the printing service life is prolonged.

The invention belongs to the technical field of preparation of molecular materials and adhesive tapes, and discloses a degradable mylar adhesive tape and a preparation method thereof, the degradable mylar adhesive tape comprises a degradable base material layer and a degradable adhesive layer; the degradable base material layer is prepared from the following raw materials in parts by mass: 25-35 parts of poly (butylene succinate) (PBS), 20-30 parts of polylactic acid (PLA), 10-15 parts of polycaprolactone (PCL), 8-12 parts of modified bamboo fiber powder, 3-5 parts of a compatibilizer and 0.5-1 part of an antioxidant; the degradable adhesive layer is prepared from the following raw materials in parts by mass: 40 to 50 parts of a modified starch-based adhesive, 15 to 25 parts of poly (butylene adipate-co-terephthalate) (PBAT), 10 to 15 parts of polyhydroxyalkanoate (PHA), 5 to 8 parts of sodium alginate-chitosan composite gel, 5 to 8 parts of an epoxypropane modifier, 1 to 2 parts of a cross-linking agent and 0.3 to 0.5 part of a de-foaming agent; by optimizing the raw material composition and the preparation process of the base material and the adhesive, the full-life-cycle degradability of the adhesive tape is realized, and meanwhile, excellent mechanical properties, insulativity and temperature resistance are ensured.

The invention discloses an energy-saving dimming assembly and a manufacturing method, and relates to the technical field of building energy-saving facilities, and the energy-saving dimming assembly is sequentially provided with a first transparent layer, a second transparent layer, a third transparent layer and a fourth transparent layer from outside to inside, the temperature response functional layer comprises a mixture of at least two thermochromic high polymer materials and is configured to realize adjustment of light transmittance in a preset temperature interval; the second transparent layer is used for supporting the temperature response functional layer; and an optical regulation and control layer configured to have a low-radiation characteristic in a long-wave infrared region. According to the invention, the transmittance of visible light and infrared light of the window can be changed along with the change of temperature at 20-38 DEG C. Meanwhile, programmed adjustment of the corresponding temperature response interval can be achieved through temperature change; and the gradual change of the transmittance of visible light and infrared light can be regulated and controlled in a programmed manner through the temperature change, so that the effects of regulating the indoor brightness and temperature and protecting the visual comfort of a user are realized, and the aim of saving energy is fulfilled.

The present application relates to the technical field of high polymer material design, and particularly relates to a high polymer material formula design optimization method and system.The method comprises: performing formula iteration according to multiple preliminary experimental data to obtain a target material formula; wherein the i-th iteration in the formula iteration comprises: according to multiple real data of the i-th iteration, performing prediction on multiple preset material formulas of the i-th iteration respectively to obtain multiple virtual data of the i-th iteration; and then performing model training to obtain a prediction model of the i-th iteration; and then determining a candidate material formula of the i-th iteration, and analyzing the difference between the real performance and the model prediction performance of the candidate material formula of the i-th iteration, and terminating the iteration when the difference is less than a preset deviation threshold.The present application can reduce the number of real experiments on material formulas under the premise of ensuring the search accuracy of the material formulas, and reduce the search cost of the optimal formula of the high polymer material.

The invention discloses a high-strength antistatic composite film and a preparation method thereof, and belongs to the technical field of high polymer materials. The antistatic composite film comprises the following components in parts by weight: 80-100 parts of high-density polyethylene, 10-25 parts of a composite antistatic agent, 1-2.5 parts of a lubricant, 3-5 parts of polypropylene grafted maleic anhydride and 0.1-1 part of an antioxidant. According to the invention, the high-density polyethylene is used as a matrix, the composite antistatic agent is added through blending, and an external coating mode is not adopted, so that the antistatic composite film is prepared; the prepared composite film has a long-term antistatic effect, the surface performance of the composite film can be remarkably improved, the comprehensive mechanical property and processing adaptability of the film can be guaranteed, and the composite film is suitable for various packaging scenes with high requirements for the surface performance.

The application discloses a kind of polymer material 3D printing additive and subtractive integrated machine and its control method, including rack body, movement module, milling cutter module, material spraying module, camera module, rack body is the frame structure of near body face opening, movement module is set in the middle frame of rack body;Movement module includes X-axis movement component, Y-axis movement component, Z-axis movement component, and the model of 3D printing forming is formed on the bearing platform by material spraying module;The cutter is provided below the milling cutter module by R-axis connecting seat, and the printed model is polished by the rotation of cutter.The control method provided by the application corrects the model sprayed by milling cutter module to material spraying module, and adopts the way of layer-by-layer spraying and layer-by-layer correction, which greatly improves the precision of spraying forming.

The invention relates to a heat-resistant dealcoholized heat-conducting organic silicon adhesive and a preparation method thereof, and belongs to the technical field of high polymer materials. The adhesive is prepared from the following raw materials in parts by weight: 100 parts of trimethoxysilyl terminated polydimethylsiloxane, 1 to 20 parts of a heat-resistant plasticizer, 100 to 800 parts of heat-conducting powder, 3 to 10 parts of heat-resistant filler, 1 to 15 parts of a silane crosslinking agent and 0.5 to 5 parts of a titanate catalyst. The heat-resistant filler is selected from one or more of ferric oxide, cerium oxide, titanium dioxide, zirconium dioxide, carbon black and phthalocyanine blue. Through reasonable proportioning of the raw materials and addition of the heat-resistant filler, the adhesive forms a compact siloxane network after being cured, has excellent heat conductivity, heat resistance and adhesive performance, and is suitable for heat dissipation and adhesive application in the fields of high-power electronic equipment, new energy automobiles, aerospace and the like. The preparation method is simple and easy for industrial production.

The invention discloses a polyarylene ether nitrile nanofiber membrane and a preparation method of the polyarylene ether nitrile nanofiber membrane through double-solvent synergistic electrostatic spinning, and relates to the field of high polymer material preparation. The method comprises the following steps: preparing two electrostatic spinning solutions with obvious volatilization rate and dissolution parameter difference, and alternately depositing two types of fibers on a collecting surface by adopting dual-channel synergistic electrostatic spinning; in the deposition and drying process, chain segments at fiber cross points are induced to swell, mutually diffuse and cure in situ to form bonding points by utilizing the poor evaporation rate of a high / low volatile solvent and the poor solvent-polymer compatibility, so that the self-densification and the structure stabilization of the nanofiber membrane are realized. The obtained nanofiber membrane has high-density in-situ bonding points and remarkably improved mechanical properties, does not need additional post-treatment such as hot pressing or solvent spraying, and is suitable for application such as interlayer reinforcement and interface toughening of composite materials. The process has continuity and controllability, and the density and mechanical properties of the membrane body can be customized by adjusting a solvent system and spinning parameters.

The invention provides a thermoplastic bistable tube and a preparation method thereof, and belongs to the technical field of high polymer materials. The preparation method of the thermoplastic bistable tube comprises the following steps: mixing PMMA (polymethyl methacrylate) and MMA (methyl methacrylate) monomers to obtain a binary resin solution, and adding an oxidizing agent and a reducing agent into the binary resin solution for secondary mixing to obtain a solution for filling; and compounding the solution for perfusion and the continuous fibers through a vacuum or high-pressure flow guide forming method, and then curing to obtain the thermoplastic bistable-state tube. The PMMA / MMA binary resin mixed solution is adopted, implosion cannot occur, the performance of the composite material cannot be damaged, electric energy does not need to be consumed for heating, the design cost and the machining cost of the composite material mold are reduced, and double cost saving and efficiency increasing are achieved.

This invention discloses a flame-retardant masterbatch and its preparation process, belonging to the field of polymer materials technology. The flame-retardant masterbatch comprises the following raw materials in parts by weight: carrier resin: 65-90 parts, modified magnesium hydroxide: 25-45 parts, colorant: 15-45 parts, dispersant: 1-5 parts, and antioxidant: 0.05-1 part. The preparation steps are as follows: S1, Weigh the carrier resin, modified magnesium hydroxide, colorant, dispersant, and antioxidant according to their weight proportions and add them to a high-speed mixer for uniform mixing to obtain a mixture; S2, Transfer the mixture to a twin-screw extruder, and after melt mixing, extrusion granulation, and drying, obtain the flame-retardant masterbatch. The prepared flame-retardant masterbatch has excellent flame-retardant and mechanical properties, and is stable and durable. Furthermore, the raw materials for preparing the flame-retardant masterbatch are readily available, the processing is simple, and it can be widely promoted.

The invention relates to the technical field of high polymer material and automobile part manufacturing, and discloses a high-durability high-low temperature resistant automobile composite sealing strip, which is prepared from the following raw materials: ethylene propylene diene monomer, polyisoprene grafted maleic anhydride, pre-dispersed master batch, carbon black and a vulcanization system. The pre-dispersed master batch takes oxidized polyethlene wax as a carrier to wrap zinc oxide and D-mannitol. The phase change characteristic of the carrier is utilized, active components are isolated in the mixing and extruding stage, and scorching is prevented; the components are released in the high-temperature vulcanization stage to initiate anhydride ring opening, and a double cross-linked network with coexistence of covalent bonds and ionic bonds is constructed. According to the sealing strip, the macromolecular reactive plasticizer is used for replacing part of liquid paraffin, the atomization problem caused by micromolecule migration is solved, the high-temperature compression permanent deformation rate is remarkably reduced through a thermal reversible mechanism of an ion cluster, and excellent low-temperature rebound resilience and processing safety are both considered.

The invention belongs to the technical field of high polymer materials, and discloses copolyester based on 4-aryl-epsilon-caprolactone and lactide as well as a preparation method and application of the copolyester. The copolyester is composed of a lactide structural unit and a 4-aryl-epsilon-caprolactone structural unit. A rigid benzene ring is introduced into a molecular chain, so that the synergistic balance of toughness and rigidity is successfully realized, and the toughness is remarkably improved while the high strength of the material is maintained. In addition, the introduction of phenyl endows the material with intrinsic ultraviolet resistance, the material can be used as an efficient ultraviolet absorbent, protective spherical protrusions are formed on the surface of the material under ultraviolet irradiation, and photooxidative degradation is effectively delayed. The material can be widely applied to the fields of high-performance degradable packaging, biomedical materials, outdoor articles, textiles and the like.

The invention provides a high-thermal-conductivity flexible epoxy composite material as well as a preparation method and application thereof, and belongs to the field of high polymer materials. The composite material disclosed by the invention is prepared by adding polydopamine modified BN and FG which are jointly used as fillers into an epoxy matrix and adopting polyether amine as a curing agent. The polydopamine modified BN and the FG are jointly used, so that a synergistic interaction effect can be achieved in the aspects of heat-conducting property, dielectric property and mechanical strength. The epoxy composite material disclosed by the invention can obtain excellent heat-conducting property, dielectric property and insulating property under the compatibility of specific raw materials. And when the curing agent with a long molecular chain is adopted, the epoxy composite material can obtain excellent flexibility, and the problem of brittleness of the existing epoxy composite material is solved. A research basis is provided for preparation and performance research of the flexible epoxy composite material, and the flexible epoxy composite material has a good application prospect.

The invention provides a cell magnetic sorting column and a preparation method thereof, and belongs to the technical field of cell magnetic sorting, the method comprises the following steps: S1, pretreating balls; s2, coating the surface of the ball with a thermoplastic high polymer material layer by adopting an electro-deposition process to form magnetic matrix particles; s3, sequentially putting a lower-layer filter screen, magnetic matrix particles and an upper-layer filter screen into the bottom shell of the separation column; s4, the upper sealing cover and the bottom shell are connected through ultrasonic welding; s5, centrifuging the sorting column subjected to ultrasonic welding; and S6, curing the centrifuged separation column. The cell magnetic separation column and the preparation method thereof are particularly suitable for magnetic separation of nanoscale magnetic beads, the problems that a traditional separation column is high in magnetic bead wastage rate, uneven in magnetic field, prone to blockage, prone to cell damage and the like can be solved, a high-purity and high-activity cell source is provided for cell therapy such as CAR-T, and the cell magnetic separation column is suitable for magnetic separation of nanoscale magnetic beads. And the process is simple and suitable for large-scale standardized production.

The invention relates to the technical field of high polymer materials, and particularly discloses a composite membrane material. The composite membrane material comprises a glass fiber reinforced acrylic prepreg with the thickness of 200-400 microns and a thermoplastic organic functional layer with the thickness of 10-30 microns, the glass fiber reinforced acrylic prepreg comprises a base material and a reinforcing material, the base material is prepared from the following raw materials in parts by weight: 90 to 110 parts of acrylic resin, 0.8 to 2.5 parts of an initiator and 0.2 to 0.8 part of an antioxidant; the acrylic resin is a methyl methacrylate-hydroxyethyl acrylate copolymer and / or hyperbranched epoxy modified acrylic resin; the thermoplastic functional coating comprises the following raw materials in parts by weight: 5-15 parts of polyimide / polymethyl methacrylate, 0-2 parts of a plasticizer and 2-8 parts of an organic solvent. The composite membrane material disclosed by the invention has the advantages of high mechanical strength, good interface compatibility, low surface roughness and the like, and has a very good application prospect.

This invention discloses an MPP pipe for power cables and its preparation method, relating to the field of polymer materials technology. The invention comprises, by weight, 80-90 parts of a toughening nucleating agent; 40-45 parts of an insulating nucleating agent obtained by in-situ composite and gradient temperature imidization treatment of a polyamic acid prepolymer prepared from hexagonal boron nitride nanosheets (prepared by surface modification with dopamine hydrochloride, followed by modification with octyltriethoxysilane) to obtain a silanized boron nitride suspension; 40-45 parts of melamine cyanurate; 2.1-2.4 parts of an antioxidant; 2.6-3 parts of a light stabilizer; 8-9 parts of a lubricant; and 1340-1500 parts of polypropylene. The introduction of the toughening nucleating agent and insulating nucleating agent in this invention effectively improves the flame retardancy, low-temperature rigidity-toughness balance, and aging resistance of the MPP pipe.

Provided is an electro-acoustic transducer capable of maintaining stable performance. An electro-acoustic transducer (1) for transmitting vibrations to a bone is provided with: a main frame (10) having at least a cylindrical section; a vibration unit (30) that is disposed on the inside of the main frame and vibrates in the axial direction of the main frame in accordance with an input signal; and an elastic member (20) that is connected to at least the vibrating part and is formed from an organic material or a polymer material.