47results about How to "Improve interface strength" patented technology

The invention belongs to the technical field of polymer plastic materials, and particularly relates to a high-temperature-resistant anti-corrosion polytetrafluoroethylene material and a preparation method thereof. The polytetrafluoroethylene is prepared from the following raw materials in parts by weight: 50 to 60 parts of polytetrafluoroethylene, 5 to 10 parts of fluorinated modified graphene oxide, 3 to 5 parts of aluminum powder, 5 to 8 parts of modified silicon carbide fiber, 3 to 5 parts of silane modified nano silicon dioxide, 2 to 3 parts of polyphenylene sulfide, 2 to 3 parts of polyimide, 0.5 to 0.8 part of dispersing agent and 0.5 to 1 part of antioxidant. The heat conduction performance and the interface bonding force are improved through the fluorinated modified graphene oxide, the impact resistance and the wear resistance are enhanced through the silicon carbide fibers, and the corrosion resistance and the wear resistance are improved through the aluminum powder; silane modified silicon dioxide enhances the mechanical property of the composite material by improving the dispersity of the filler, and PPS and PI interact with the surface of the filler through polar groups in molecular chains, so that the interface strength is improved, and the toughness and the thermal stability are improved.

The invention relates to the field of hot melt adhesives, and discloses a biodegradable hot melt adhesive based on castor oil and rosin resin and a preparation process thereof, the biodegradable hot melt adhesive comprises EVA resin, modified castor oil, rosin resin, a modified additive, a lubricant and an antioxidant; the modified castor oil is prepared by crosslinking castor oil and isophorone diisocyanate and reacting lignin, 1, 4-butanediol and isocyanate groups; the modified castor oil and the modified additive are added, the modified castor oil and the modified additive are added, the modified castor oil and the modified additive are added, the modified castor oil and the modified additive are added, the modified castor oil and the modified additive are added, the modified castor oil and the modified additive are added, and the modified castor oil and the modified additive are added, so that the modified castor oil and the modified additive are added, and the modified castor oil and the modified additive are added; the tensile property and the adhesive property of the hot melt adhesive are improved, and meanwhile, the flame retardant property and the high and low temperature resistance of the hot melt adhesive can be improved.

The invention belongs to the technical field of flame retardants, and relates to a high-strength hyperbranched halogen-free flame retardant as well as a preparation method and application thereof, the preparation method comprises the following steps: preparing a modified isocyanate silane coupling agent from bis (3-aminophenyl) phenylphosphine oxide and 3-isocyanatopropyltriethoxysilane; the preparation method comprises the following steps: preparing a modified amino silane coupling agent from triglyceride isocyanurate and 3-aminopropyltriethoxysilane; the high-strength hyperbranched halogen-free flame retardant is prepared from a modified isocyanate silane coupling agent and a modified amino silane coupling agent. The silane coupling agent is modified according to the principle that an isocyanate group on the surface of the silane coupling agent can chemically react with a tertiary amine group and an epoxy group can react with an amino group, the two modified silane coupling agents form the hyperbranched flame retardant after being hydrolyzed, the highly branched structure enables the intermolecular force to be small, and the hyperbranched flame retardant has the advantages of high flame retardance and high flame retardancy. And the flame retardant shows excellent mechanical strength and excellent flame retardant effect.

According to the preparation method, PET and graphene are compounded to form a high-strength layer by utilizing a high-speed mixing and hot-pressing technology, so that the mechanical property and the deformation resistance of the diaphragm are effectively enhanced, and the safety and stability of a battery structure are ensured; pI and a pore-foaming agent are combined to prepare a breathable layer with an optimized pore structure, so that the breathability and the structural strength are balanced, and the operation efficiency and the safety of the battery under high-rate charge and discharge conditions are improved; the breathable layer is coated with aluminum oxide through a chemical vapor deposition or sol-gel method to form a lyophilic layer, and the interlayer bonding force is enhanced by combining PU and a silane coupling agent, so that the lyophilic property and the interface strength are improved, the permeation efficiency of an electrolyte is optimized, and the internal resistance of the battery is reduced; the surface of the diaphragm is modified through plasma treatment, so that the overall performance is further improved; the defects of a traditional battery diaphragm in the aspects of mechanical support, air permeability, lyophilic property and the like are overcome, and the overall performance of the battery is remarkably improved.

The invention relates to the technical field of glass fiber reinforced plastics, and discloses a corrosion-resistant composite glass fiber reinforced plastic and a preparation method thereof. The preparation method comprises the following steps: carrying out Mannich reaction, reduction reaction and addition reaction on 2, 4 ', 4'-methylene triphenol, 5-aminoisophthalonitrile, formaldehyde, RaneyNi, 3-isocyanatopropyltriethoxysilane and the like which serve as raw materials to obtain benzoxazine polysilane, carrying out surface modification on basalt fibers and carbon fibers by using the benzoxazine polysilane to obtain modified hybrid fibers, and carrying out surface modification on the basalt fibers and the carbon fibers by using the modified hybrid fibers. P-fluorobenzaldehyde and aminopropyltriethoxysilane are used as raw materials, fluorine-containing silane is obtained through a Schiff base reaction, the fluorine-containing silane and hydroxyl on the surface of graphene oxide are subjected to a hydrolytic condensation reaction, fluorine-containing modified graphene oxide is obtained, finally, a curing agent, the modified hybrid fibers and the fluorine-containing modified graphene oxide are added into epoxy resin to be stirred and mixed to be uniform, curing is conducted, and the modified hybrid fibers are obtained. The corrosion-resistant composite glass fiber reinforced plastic is obtained. The composite glass fiber reinforced plastic prepared by the invention has excellent corrosion resistance, heat resistance and mechanical properties.

The invention discloses a carbon fiber sizing agent as well as a preparation method and a sizing method thereof in the technical field of fiber materials, and the carbon fiber sizing agent comprises the following components in parts by weight: 30-50 parts of epoxy resin, 15-25 parts of an epoxy emulsifier, 6-9 parts of modified graphene and 80-120 parts of distilled water; the epoxy emulsifier is epoxy resin grafted para aminobenzoic acid and octadecylamine; the modified graphene is graphene grafted lysine. A hydrophilic chain segment p-aminobenzoic acid and a lipophilic chain segment octadecylamine are introduced to modify epoxy resin, an epoxy emulsifier is prepared, the emulsion type carbon fiber sizing agent is prepared through a phase inversion emulsification method, the stability of the sizing agent is improved, modified graphene is added to stabilize sizing agent emulsion, and the interface performance of carbon fibers is improved.

The invention relates to the technical field of rubber waterstops, and discloses a rubber waterstop suitable for a low-temperature environment of a tunnel in a cold region and a preparation method of the rubber waterstop. The rubber waterstop suitable for the low-temperature environment of the tunnel in the cold region is prepared from the following raw materials in parts by mass: 100 to 150 parts of ethylene propylene diene monomer, 5 to 15 parts of homopolymerized epichlorohydrin rubber, 20 to 40 parts of acrylate rubber, 1 to 3 parts of liquid nitrile rubber, 0.01 to 0.1 part of phthalic anhydride, 5 to 10 parts of nano graphene oxide, 1 to 3 parts of tetraethoxysilane, 1 to 2 parts of amino silane and 40 to 60 parts of reinforcing agent. 1-3 parts of an anti-aging agent, 1-5 parts of a plasticizer, 1-2 parts of a vulcanizing agent and 1-2 parts of an accelerant. The obtained water stop belt is excellent in mechanical performance, tensile strength, tearing strength and compression set at the low temperature of-40 DEG C are excellent, cracking is avoided at the low temperature, and the water stop belt can better adapt to the extreme environment.

This invention discloses a concrete mix design and manufacturing method for underground engineering concrete in a coupled environment of underground environment and load, relating to the field of underground engineering concrete technology. It aims to address the problem that traditional concrete mix design does not fully consider the coupling effect of underground environment and load. The underground environment includes groundwater erosion, wet-dry cycle, and temperature fluctuation; the load includes stress ratio. α s Dynamic load frequency and dynamic load amplitude α d This leads to technical problems such as insufficient erosion resistance, crack resistance, and mechanical stability of concrete, resulting in a short service life. This mix design is based on quantitative analysis of coupled environmental parameters. With cement, composite admixtures, recycled aggregates, modifiers, water, and additives as core components, the basic mix proportion is determined through a mapping model between "environment-load" coupled parameters and component content. The target mix proportion is then obtained through orthogonal experimental optimization. The manufacturing method includes four core steps: raw material pretreatment, graded mixing, gradient curing, and coupled environmental simulation curing.

The invention discloses a tungsten alloy preparation method based on multi-element doping and wet ball-milling mixing, and relates to the technical field of powder metallurgy. The method comprises the following steps: weighing tungsten trioxide powder, nickel oxide powder and ferric oxide powder in proportion, and adding an isopropanol solvent for wet ball milling to obtain original slurry; carrying out ball material separation and drying on the original slurry, and fully reducing by using hydrogen to obtain W-Ni-Fe composite powder; multiple elements are doped in the W-Ni-Fe composite powder for secondary material mixing, and multi-element doped mixed powder is obtained; the multi-element doped mixed powder is put into a rubber sleeve and then subjected to cold isostatic pressing, and a W-Ni-Fe alloy bar blank is obtained; and the W-Ni-Fe alloy bar blank is subjected to sintering and vacuum annealing, and the W-Ni-Fe alloy is obtained. According to the embodiment of the invention, the problem that the raw material powder is difficult to mix uniformly in the dry mixing process is solved, and the distribution uniformity of Ni, Fe and doped elements in the multi-element doped mixed powder is improved.

The invention discloses a release agent for a carbon fiber composite material workpiece, and the release agent is prepared from the following raw materials in parts by weight: 5-8 parts of organic silicon modified epoxy resin, 2-5 parts of silicone oil, 0.1-1 part of an emulsifier, 1-2 parts of a defoaming agent, 1-2 parts of a dispersing agent, 3-5 parts of a stabilizer and 50-80 parts of an ionic aqueous solution. The invention also discloses a preparation process of the release agent for the carbon fiber composite material workpiece. The organic silicon resin is modified, and the polymethylphenylsiloxane and the interface modifier are added, so that the release agent is more uniform, the interface strength of the release agent is higher, the ductility and compactness of the release agent are increased, the release times of the release agent are increased, and the quality of the release agent is effectively improved.

The invention relates to the field of epoxy molding compounds, and discloses a preparation method and application of a modified carbon nanotube and a preparation method and application of an epoxy molding compound. The preparation method comprises the following steps: (1) mixing a mixed acid solution with a carbon nanotube for reaction to obtain an acidified carbon nanotube; (2) mixing a mixed solution of thionyl chloride and N, N-dimethylformamide with the acidified carbon nano tube for reaction to obtain an acylating chlorination carbon nano tube; (3) under the protection of an inert gas, mixing the acylating chlorination carbon nano tube with ethanediamine for reaction to obtain an amino modified carbon nano tube; and (4) carrying out ultrasonic treatment on the amino modified carbon nanotube and a modifier containing an epoxy group. The epoxy molding compound prepared from the modified carbon nanotube has excellent strength and toughness, can effectively solve the problems of insufficient strength and toughness and the like of the existing epoxy molding compound, and can be well used in the field of electronic packaging.

The invention relates to a construction method for improving the carbon sequestration performance of a cement concrete pavement, and belongs to the technical field of road construction.IPDA is used for treating the surface of the cement concrete pavement, amino functional groups in organic amine react with carbon dioxide, and the carbon sequestration performance of the cement concrete pavement is improved; the IPDA reacts with the carbon dioxide to promote calcium carbonate generated by the concrete to form a plurality of mechanical bonds between the base materials, so that the calcium carbonate is firmly bonded with the base materials; meanwhile, pores in the cement concrete pavement can be filled with calcium carbonate to form a continuous reinforced surface in any direction, so that the compactness and the interface strength of the cement concrete pavement are improved, and an original porous system is changed into a relatively compact system. The carbon dioxide trapping and fixing capacity of the cement concrete pavement is improved, and the breaking strength, the compressive strength, the waterproof performance and the durability of the pavement after carbon fixation are improved.

The application provides a live working insulation shielding blanket, which comprises a surface layer and an inner layer, the surface layer has two layers and is attached to the outer surface of the inner layer, the inner layer is a multi-layer structure arranged in a laminated mode, the raw material of the surface layer comprises EVA, montmorillonite loaded with imidazole polybasic borate complex, natural rubber, PA6 short fibers, EVA-g-MAH, a flame retardant, an antioxidant and a colorant, and the raw material of the inner layer comprises EVA, montmorillonite loaded with imidazole polybasic borate complex, natural rubber, EVA-g-MAH and a colorant. The montmorillonite loaded with imidazole polybasic borate complex is added to the surface layer and the inner layer in cooperation, multiple protections of outer molten prevention and inner collapse prevention are realized, the service life of the material in an extreme environment is effectively prolonged, and the problems of easy softening and insulation failure of a traditional EVA insulation shielding blanket under high temperature are solved.

The invention discloses a completely biodegradable floor and a preparation method thereof. The completely biodegradable floor comprises the following components in parts by weight: 45-70 parts of PLA (polylactic acid), 5-25 parts of PBAT (poly (butylene adipate-co-terephthalate)), 1-3 parts of a compatilizer, 0.3-0.5 part of a lubricant and 0.3-0.5 part of an antioxidant. The material is dried by the dryer to reduce the influence of moisture on the mixing quality of the material, the PBAT and the compatilizer are proportioned by weight and then added into a mixer to be mixed for 10 minutes, then a certain mass of PLA is added to be blended for 8 minutes, then the antioxidant and the lubricant are sequentially added into the mixer to be mixed and stirred for 15 minutes in the mixer, and the material is prepared. According to the present invention, the PLA / PBAT floor base material can be completely biodegraded through the compatibilizer, the compatibilizer has good compatibility with the base material, the compatibilizer is added to improve the interfacial strength of the PBAT and the PLA, and improve the interfacial bonding force of the filler and the PLA so as to improve the compatibility between the materials, and the compatibilizer and the PBAT material are added to provide the toughening effect on the PLA material.

The present application relates to a kind of low carbon environmental protection rock wool composite material and its preparation method.The method is first activated by using choline chloride-polyol constructed deep eutectic solvent to rock wool fiber, form more reaction sites;Subsequently, introduce phytic acid to construct stable multidentate chelation layer, improve the chemical reaction activity of fiber surface;Finally, through epoxy etherification end-capping, form the compact interface bonding structure, so that modified fiber has higher compatibility and interface stability.Modified rock wool fiber and halogen-free flame retardant, biological coupling agent, plant wax hydrophobic agent and organic small molecule are synergistically compounded, can construct stable and uniform three-dimensional reinforcing network.The obtained composite material is significantly improved in mechanical properties, water resistance, durability and flame retardant performance, while maintaining good processing adaptability and material stability.The present application is suitable for high-performance insulation board, building thermal insulation structure and weather-resistant composite material field.

The application relates to the technical field of ceramics, and discloses a high-strength high-temperature-resistant ceramic material and a preparation method, wherein graphene oxide and polyamide naphthalene sulfonate dispersant are reacted, then mixed with clay, quartz powder, talc powder, fly ash and the like through ball milling, calcined, and finally a high-strength high-temperature-resistant ceramic material is obtained. The polyamide naphthalene sulfonate is grafted to the surface of graphene, the dispersibility of the graphene is improved, and the mechanical strength of the ceramic material is improved. The main chain of the polyamide naphthalene sulfonate dispersant contains an amide bond, and the side chain contains a naphthalene sulfonate structure, so that the quartz, fly ash and the like can be dispersed, the apparent porosity of the ceramic is significantly reduced, and the bending strength and other mechanical properties are improved.

The present invention belongs to the field of resource utilization of industrial solid waste, and specifically relates to a geopolymer stabilized recycled aggregate road base material and a preparation method. The present invention uses industrial solid waste slag powder, fly ash, steel slag powder, and carbide slag to prepare geopolymer cementitious materials, uses brick-concrete recycled aggregate as aggregate, uses sodium metasilicate pentahydrate, sodium silicate, and sodium hydroxide as alkali activators, combines interface activators and nanocrystalline nucleating agents, proposes a surface activation and secondary activation method for brick-concrete recycled aggregate, and prepares a road base material that fully utilizes solid waste, has high interface strength, good crack resistance, is economical and environmentally friendly, has high mechanical strength, and has low drying shrinkage. It can reduce the carbon emissions and material costs of semi-rigid base construction, ensure the construction quality of brick-concrete recycled aggregate utilization, and effectively absorb a large amount of industrial solid waste.

The present application discloses a method for preparing a photoresist layer, which comprises: providing a substrate; forming a first photoresist layer on the substrate; and processing the first photoresist layer to form a second photoresist layer containing a graft copolymer. The second photoresist layer containing the graft copolymer is formed by processing the first photoresist layer after the first photoresist layer is formed. Since the second photoresist layer contains the graft copolymer, the adhesion of the second photoresist layer and the interface strength of the photoresist layer are improved, thereby reducing the risk of collapse of the second photoresist layer and improving the reliability of device quality.

The invention discloses a preparation method of anti-crack and anti-freezing fiber composite concrete, and relates to the field of concrete. The preparation method comprises the following steps: immersing bionic spider silk into a microbial mineralization solution, adding a photoresponse nano material, and adjusting illumination, so that calcium carbonate crystals are arranged in a honeycomb shape on the surface of the spider silk, bionic spider silk fibers and microbial mineralization layers are alternately deposited, and a'fiber-mineralization layer-fiber 'sandwich structure is constructed. The structure cooperates with a spider silk spiral and honeycomb mineralization layer, the concrete interface strength is greatly improved, shrinkage cracks are effectively inhibited, microorganisms are activated and mineralized in the cracks to repair the cracks, and the concrete is endowed with high crack resistance and self-repairing capacity. Meanwhile, the self-made nano-composite fiber takes polyvinyl alcohol and ethylene glycol copolymer as main materials, polylactic acid micro-cavities containing anhydrous calcium chloride are connected to two ends of the self-made nano-composite fiber, and the freezing resistance of the concrete is improved by the hydrophilicity of the polyvinyl alcohol and the heat release of the anhydrous calcium chloride. The anti-cracking and anti-freezing fiber composite concrete prepared by the invention has the effects of high cracking resistance and high freezing resistance.

This invention discloses a high-temperature resistant downhole emulsion explosive and its preparation method, belonging to the field of emulsion explosive technology. The emulsion explosive comprises an aqueous phase material, an oil phase material, and a sensitizer, with a mass ratio of (88-96):(4-12):(0.8-2.0). The aqueous phase material, by mass parts, includes the following raw materials: 70-80 parts ammonium nitrate, 4-6 parts sodium nitrate, 5-8 parts urea, 0.1-0.6 parts chitosan quaternary ammonium salt, and 10-20 parts water. The oil phase material, by mass parts, includes the following raw materials: 50-70 parts composite oil phase and 20-40 parts composite emulsifier, which includes Span80 and polyisobutylene succinimide derivatives. This invention involves adding the aqueous phase material to the oil phase material, adding the sensitizer to the emulsion matrix formed by emulsification, and stirring to prepare the emulsion explosive. The emulsion explosive provided by this invention is suitable for use in deep well high-temperature environments and exhibits good high-temperature stability.

The invention discloses a quick-repair expansion joint polyurethane elastomer composition in the field of polyurethane elastomer and a preparation method thereof, which is prepared from the following components in parts by weight: 53-62 parts of corn stalks, 32-46 parts of diphenylmethane-4,4'-diisocyanate, 7-10 parts of polytetrahydrofuran, 0.5-0.6 parts of pentamethyldiethylenetriamine, 6-9 parts of polyethylene glycol, 1.6-2.2 parts of 4,4'-dicarboxyl diphenyl disulfide, 3.5-5 parts of 1,4-butanediol and 0.9-1.6 parts of modified graphene. The present invention prepares a straw cellulose-polyurethane-graphene composite gel and introduces 4,4'-dicarboxyl diphenyl disulfide to achieve the improvement of the self-repairing effect of the material and the service life.

The application discloses an ultrahigh molecular weight polyethylene-acrylonitrile butadiene rubber composite elastic material, which comprises 70wt%-95wt% of ultrahigh molecular weight polyethylene and 5wt%-30wt% of acrylonitrile butadiene rubber powder, has an island-sea structure, wherein the acrylonitrile butadiene rubber powder is a dispersed phase, the ultrahigh molecular weight polyethylene is a continuous phase, and the dispersed phase and the continuous phase are connected by C-C chemical bonds; and the particle size of the acrylonitrile butadiene rubber powder is less than or equal to 0.7mm. By limiting the content of the ultrahigh molecular weight polyethylene and the acrylonitrile butadiene rubber powder, combining the connection between the two phases by C-C chemical bonds and limiting the particle size of the acrylonitrile butadiene rubber powder, the rubber particles in the composite elastic material are first deformed when the composite elastic material is subjected to external force, so that the composite elastic material has good resilience and lower permanent deformation at a smaller strain.

The invention discloses a carbon fiber transmission shaft and a forming mold and a forming method thereof, and relates to the field of carbon fiber composite materials. The carbon fiber transmission shaft comprises a transmission shaft body and a shaft head. The transmission shaft body is made of a carbon fiber composite material and is tubular, and shaft heads are arranged in cavities at two ends of the transmission shaft body; the shaft head is made of metal or alloy and is tubular; the shaft head and the transmission shaft body are installed in an inverted fit mode. And the shaft head and the transmission shaft body are co-cured integrally formed parts. The invention further discloses a forming die and a forming method, reverse buckling type connection and co-curing integrated forming of the transmission shaft body and the shaft head can be achieved on the basis of the forming die and the forming method, and the defects caused by the fact that in the prior art, a carbon fiber composite transmission shaft cannot be wound away after connection and after connection are overcome. The connection strength of the carbon fiber composite transmission shaft is improved, the dynamic balance of the transmission shaft is optimized, and the production efficiency is improved.

The invention discloses an anti-aging polyurethane sponge and a preparation method thereof, and belongs to the technical field of polyurethane preparation, adamantane modified graphene oxide is introduced in the preparation process of polyurethane to form a block copolymer, and the anti-aging performance and the mechanical performance of the material are improved; by introducing the ureido-modified polyethylene derivative, the water resistance, ultraviolet resistance and impact resistance of the polyurethane sponge are improved; the anti-aging polyurethane sponge prepared by the preparation method disclosed by the invention is excellent in anti-aging performance and excellent in mechanical property, and the service life of the polyurethane sponge is effectively prolonged.

The application discloses a coating material for optical fiber and a preparation method thereof, an optical fiber insulator and a preparation method thereof. The preparation raw material of the coating material comprises the following components in parts by weight: tetrahydrofuran acrylate 40-60 parts by weight, carboxyl modified polyurethane acrylate oligomer 30-50 parts by weight, silicone modified epoxy acrylate bifunctional linker 5-15 parts by weight, vinyl silane surface modified SiO2 nanoparticles 2-5 parts by weight, triaryl sulfonium hexafluoroantimonate cationic initiator 0.1-1 part by weight, and TPO free radical photoinitiator 0.5-4 parts by weight. According to the embodiment of the application, the silicone modified epoxy acrylate bifunctional linker in the coating layer realizes active chemical bonding between the optical fiber coating layer and the alicyclic epoxy resin sheath, reduces the physical gap and thermal stress mismatch of the multi-material interface, and thus can fundamentally improve the interface strength, internal insulation performance and long-term reliability of the optical fiber insulator.

The application provides a composite tungsten steel die and a preparation method, and comprises a composite structure with a radial gradient distribution, which at least comprises an inner working area, an intermediate transition area and an outer supporting area which are sequentially compounded, and the component content of the inner working area, the intermediate transition area and the outer supporting area continuously changes in a gradient manner. The hardness of the material gradually decreases from the inside to the outside, and the toughness gradually increases, so that the stress / strain field can be smoothly transmitted and distributed when the die bears a working load such as drawing, and stress peaks are avoided on a single interface, so that the material performance smoothly transitions from super-high hardness, high wear resistance to high hardness, high toughness, and then to high toughness and high strength from the inside to the outside.

This invention discloses a method for preparing epoxy resin, comprising the following steps: uniformly mixing a toughening agent and a curing agent to obtain a compound, wherein the curing agent is methylhexahydrophthalic anhydride and the toughening agent is ZIF-8; preheating bisphenol A type epoxy resin E51 at 60-80℃ for 15-20 min to obtain a pretreated epoxy resin; mixing the pretreated epoxy resin with the compound at 60-80℃; adding a defoamer and an accelerator under stirring; reacting at a constant temperature of 60-80℃ for 5-8 min to obtain a mixture; vacuum degassing the mixture, curing, and demolding to obtain the epoxy resin. The preparation method of this invention utilizes the synergistic effect of 2,4,6-tris(dimethylaminomethyl)phenol and ZIF-8 to toughen the epoxy resin, resulting in an epoxy resin with excellent mechanical properties, with an impact strength reaching up to 28.24 KJ / m². 2 .

The invention relates to the field of amorphous brazing filler metal and brazing, in particular to amorphous foil strip brazing filler metal for titanium and high-nitrogen steel brazing and a preparation method and application of the amorphous foil strip brazing filler metal. The amorphous foil strip brazing filler metal for brazing the titanium and the high-nitrogen steel comprises the following components in parts by weight: 35 to 65 parts of FexTi (100-x) alloy, 30 to 50 parts of Zr and 5 to 10 parts of Fe, wherein the value of x ranges from 10 to 50. The amorphous foil strip brazing filler metal for titanium and high-nitrogen steel brazing is uniform in chemical component, good in wettability, good in toughness, bright and neat in surface, excellent in performance when being used for a brazing joint of titanium and high-nitrogen steel, and not prone to cracking.

The application relates to the technical field of plastic packaging film, and particularly discloses a recyclable PE wrapping film and a preparation method thereof. The recyclable PE wrapping film comprises the following raw materials: PE recyclable material, ethylene-propylene-diene rubber, active phenolic resin, metal halide, metallocene POE, HDPE resin, tackifying masterbatch, and the balance of LLDPE resin; the preparation method is as follows: the LLDPE resin is mixed with the PE recyclable material and the ethylene-propylene-diene rubber, hot melting, the active phenolic resin and the metal halide are added from the side feeding, hot melting, and a melt is prepared; the melt is cast and cooled to prepare a cast sheet, the cast sheet is drawn and stretched, and then subjected to corona treatment, curling and slitting. The recyclable PE wrapping film does not add opening agents, slip agents and anti-fog agents, ensures that the product is easy to recycle, the recyclable material has high purity, a high content of PE recyclable material is added, and the recyclable PE wrapping film still has relatively high tensile strength, puncture resistance and transparency.

The invention discloses a method for preparing a sodium alginate composite fiber membrane antibacterial dressing. The invention spins sodium alginate and a carboxyl quaternary ammonium salt hyperbranched polymer through an electrostatic spinning machine, and then performs ion crosslinking in a calcium chloride solution to obtain a sodium alginate composite fiber membrane antibacterial dressing. The carboxyl quaternary ammonium salt hyperbranched polymer contains a large number of carboxyl groups. Under the crosslinking action of calcium chloride, its carboxyl groups can be ion crosslinked with the carboxyl groups of the sodium alginate fibers, so that the carboxyl quaternary ammonium salt hyperbranched polymer and the sodium alginate fibers are ion crosslinked to form a high crosslinking degree and a stable ion crosslinking network, thereby improving the tensile strength and elongation at break of the fiber membrane dressing. The hyperbranched polymer contains a large number of hydrophilic carboxyl groups and quaternary ammonium salt groups, which can improve the hydrophilicity, water absorption and antibacterial properties of the fiber membrane dressing.