50results about How to "Increase the degree of cross-linking" patented technology

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.

The present application relates to the field of environment-friendly materials and its preparation technology, and particularly relates to a degradable environment-friendly paper cup interior coating and a preparation method thereof. The method comprises the following steps: firstly, synthesizing polymerizable quaternary ammonium salt surfactant (RPKO-X), and then introducing the polymerizable quaternary ammonium salt surfactant and a bio-based polymer solution into a polyacrylate molecular chain by a redox initiation polymerization method, so as to obtain a degradable acrylate emulsion for paper cup interior coating. By introducing the hydrophobic monomer RPKO-X with emulsifier characteristics, a stronger crosslinking network is formed, which can significantly improve the water resistance and oil resistance of the coating. Meanwhile, by introducing the bio-based material polyvinyl alcohol 2688, the environmental friendliness of the coating is enhanced, and the rapid degradation of the coating after use is promoted. By using the redox initiation polymerization system, the method is simple to prepare, can be prepared under mild conditions, and the emulsion particle size is uniform and stable.

The present application relates to the technical field of adhesive tape, in particular to the field of IPC B65H35, further to a high-temperature-resistant cutting adhesive tape and a preparation method thereof.From top to bottom, the high-temperature-resistant cutting adhesive tape comprises a protective layer, an adhesive layer and a substrate layer in sequence.The adhesive of the adhesive layer comprises the following raw materials in parts by mass: 70-90 parts of prepolymer, 20-50 parts of active diluent, 3-10 parts of photoinitiator, 1-4 parts of antioxidant and 3-6 parts of silane coupling agent.The present application selects to introduce bisphenol A epoxy acrylate and phenolic epoxy acrylate, and selects isobornyl acrylate and dipropylene glycol diacrylate to be used as the active diluent together, so that the cross-linking degree of the adhesive system is high, the system has a suitable curing shrinkage, the cohesive strength of the system is large, the high-temperature-resistant cutting adhesive tape has good bonding performance while the high-temperature-resistant performance is improved, and the prepared high-temperature-resistant cutting adhesive tape has excellent bonding performance and high-temperature-resistant performance.

This invention discloses an acid and alkali resistant polyamide membrane and its preparation method. The method is as follows: S1: Immerse the ultrafiltration base membrane in an aqueous sodium hydroxide solution for soaking and then set aside; S2: Treat the base membrane with a mixed aqueous solution of polyamine and aziridine crosslinking agent; S3: Wet the base membrane in an organic phase solution of polyacrylamide monomer to obtain a polyamide composite membrane; S4: Immerse the prepared polyamide composite membrane in an alcoholic solution of hydroxymethyl crosslinking agent, then dry it in a forced-air drying oven, and after washing with water, obtain the acid and alkali resistant polyamide membrane. This application uses two crosslinking agents, aziridine and hydroxymethyl, which can undergo specific crosslinking reactions with the carboxyl groups inside the polyamide membrane, to directly perform dual crosslinking modification on the membrane interior and surface, without introducing other polymer materials to avoid excessive increase in membrane permeation resistance. The polyamide membrane prepared by this method has both good acid and alkali resistance and water permeability.

The invention relates to the technical field of polymethyl methacrylate, and discloses a flame-retardant polymethyl methacrylate material and a preparation method thereof.The flame-retardant polymethyl methacrylate material is obtained by reacting polymethyl methacrylate, a hydroxyl-terminated flame retardant and p-toluenesulfonic acid. The linear polymethyl methacrylate is crosslinked into a three-dimensional network structure, so that the crosslinking degree between molecular chains is enhanced, the molecular chains are not easy to slip under stress, good structural stability is maintained, and the polymethyl methacrylate has high tensile strength and bending strength. The flame retardant contains piperazine rings and phosphate structures, forms an intumescent flame-retardant system, generates phosphoric acid substances, nitrogen and other gases during combustion, promotes dehydration of a matrix to form an intumescent carbon layer, isolates oxygen, prevents heat conduction, inhibits the combustion process, remarkably reduces the peak value of the heat release rate and the total heat release amount, and has excellent flame-retardant performance.

This invention discloses a high-performance polyamide desalination membrane, its preparation method, and its applications. It provides a porous supporting substrate membrane, an aqueous solution containing a multifunctional amine monomer and a polymerizable gemini surfactant, and an organic solution containing a multifunctional acyl chloride monomer. The supporting substrate membrane is sequentially contacted with the aqueous solution, and the polymerizable gemini surfactant is polymerized under ultraviolet light to form a monolayer interfacial polymer thin layer. The substrate membrane is then contacted with the organic solution, allowing the amine and acyl chloride monomers to undergo condensation polymerization at the interface, forming an ultrathin polyamide active separation layer with a wrinkled morphology. This invention features a simple process, is compatible with traditional processes, and the membrane material can be applied to various fields such as brackish water desalination, separation of multivalent / monovalent salts, and lithium extraction from salt lakes. It solves the problems of insufficient flux and unstable salt separation selectivity of traditional polyamide desalination membranes.

The invention relates to transparent light-heat curing acrylate modified epoxy resin and a preparation method and application thereof, and the transparent light-heat curing acrylate modified epoxy resin comprises the following components: aliphatic polyurethane acrylate oligomer, acrylate monomer, styrene-maleic anhydride copolymer, adhesion promoter, amino resin, photoinitiator, hydrogenated epoxy resin A and hydrogenated epoxy resin B, the composition is prepared from a thixotropic agent, an anti-aging agent, a UV absorbent, a light stabilizer, a curing agent and an accelerant. The problems that the requirement for glass fibers is high, holes are prone to occurring inside and the like due to insufficient infiltration of pure acrylic ester are solved, and the light photovoltaic flexible assembly prepared from the epoxy resin is excellent in performance and has good market application prospects.

This invention relates to the field of reinforcement materials technology, specifically to reactive low-temperature reinforcement materials for mining, their preparation methods, and applications. The reactive low-temperature reinforcement material for mining comprises component A and component B. Component A consists of polyester polyol, polyether polyol, silane coupling agent, and catalyst; component B consists of prepolymer and additives. The prepolymer is obtained by reacting polyether polyol b with polymethylene polyphenyl polyisocyanate. Polyether polyol b has a functionality of 3.1 and a hydroxyl value of 207 mg KOH / g, and is a polyether polyol polymerized with propylene oxide using maltitol, trimethylolpropane, hydroquinone, and triethylene glycol as initiators. The material prepared by this invention is primarily reactive in structure and flame-retardant, avoiding the impact of adding large amounts of additive flame retardants on material strength. The resulting material exhibits high compressive strength, low internal heat of reaction, and good flame-retardant properties.

This invention discloses a precipitated silica dispersant for rubber, its preparation method, and its application, relating to the field of rubber additives. The precipitated silica dispersant for rubber is made from raw materials comprising the following proportions: modified vegetable oil and hydroxide, wherein the molar ratio of the modified vegetable oil to the hydroxide is 1:(0.3-0.6), and the modified vegetable oil is copolymerized from vegetable oil monomers, benzene ring unsaturated monomers, and cashew nut phenol. This application provides an environmentally friendly and safe precipitated silica dispersant that can significantly improve the dispersibility of precipitated silica in rubber compounds while simultaneously improving the mechanical properties of the rubber compounds.

This invention provides a halogen-free flame-retardant UV-moisture-curing polyurethane conformal insulating resin and its preparation method, belonging to the field of polymer materials technology. The conformal insulating resin of this invention is prepared from the following raw materials in parts by weight: 100 parts HDI trimer, 50-120 parts organosilicon-modified polyol, 10-40 parts chain extender containing a hindered phenol-phosphate structure with bifunctional groups, 15-45 parts hydroxyl-containing acrylate, 2-10 parts photoinitiator, 0.1-1.5 parts polymerization inhibitor, and 20-80 parts reactive diluent. This invention embeds hindered phenol-phosphate synergistic flame-retardant groups into the polyurethane backbone, achieving a UL94V-0 rating and limiting oxygen index ≥32% under halogen-free conditions; the UV-moisture dual-curing mechanism increases the crosslinking degree in the shaded area from 65% to 95%, significantly improving the integrity of the insulation protection.

This invention relates to the field of coating technology and discloses a high-bonding-energy rare-earth nano-coating, its preparation method, and its application. The coating of this invention comprises 35-52 parts by weight of silica, 12-23 parts by weight of hydroxide, 0.3-0.8 parts by weight of lanthanum complex, and 26-34 parts by weight of filler, etc. The lanthanum complex tightly bonds the metal substrate to the silicate coating, improving the bonding energy and adhesion strength between the coating and the metal substrate, making the coating less prone to peeling. The lanthanum complex contains phthalonitrile groups. During high-temperature heat treatment, phthalonitrile undergoes self-crosslinking and cyclization to generate phthalocyanine and other aromatic heterocyclic structures with high-temperature resistance, which is beneficial to improving the heat resistance of the coating. Simultaneously, the formed chemical crosslinking system enhances the crosslinking degree within the silicate coating, inhibiting the entry of corrosive media such as acids and alkalis into the coating matrix, and improving the coating's resistance to acid and alkali corrosion.

This application relates to the field of membrane filtration, and in particular to an acid and alkali resistant and fouling-resistant nanofiltration membrane, its preparation method and filter. By first introducing isocyanate into the base membrane, and then forming a polyamide layer through the co-reaction of aromatic sulfonamide and PIP, the overall cross-linking degree of the system is improved by using isocyanate, and the cross-linking system with a certain rigidity is formed by using aromatic sulfonamide in the system. This ensures the water flux under high inlet water pressure, and also improves the acid and alkali resistance of the membrane.

The present application relates to the technical field of photographic paper coating, and particularly relates to a water-based coating for dye ink special PP synthetic photographic paper for increasing the film covering firmness of hot mounting film and a preparation method thereof, the water-based coating for dye ink special PP synthetic photographic paper for increasing the film covering firmness of hot mounting film contains the following components in 100% by mass: modified silicon dioxide 10-20%, polyvinyl alcohol 25-35%, polyurethane-acrylic hybrid emulsion 8-15%, nano boehmite 2.5-3.5%, dispersant 1.5-2.5%, thickening agent 0.5-0.7%, leveling agent 0.2-0.4%, defoaming agent 0.3-0.5%, expanding agent 2-4%, accelerator 0.5-1.5%, mildew-proof agent 0.1-0.3%, ammonia water 0.1-0.3%, and the rest is deionized water. The water-based coating prepared by the present application has good ink absorbability, strong film covering firmness after hot mounting film covering, and high ink adaptability.

This invention discloses a hierarchical guanidine resin-based CO2 adsorbent material and its preparation method, belonging to the field of polymer synthesis technology. The adsorbent material prepared by this invention has a composite spherical structure and a hierarchical pore structure, including micropores, mesopores, and macropores. By introducing a hierarchical pore structure, the adsorption capacity of the material for CO2 is effectively improved. The introduction of hierarchical pores can significantly reduce molecular diffusion resistance and increase the contact area between the adsorbent and CO2 molecules, thereby achieving rapid adsorption. Furthermore, pyridyl, polyamino compounds, and guanidine groups have strong basicity and chemical affinity for CO2. Through surface functionalization modification, the number of active sites on the material surface is significantly increased, thereby further improving the CO2 adsorption capacity and selectivity.

This invention belongs to the field of photocurable material preparation, specifically relating to a high-temperature resistant UV-curable adhesive for photovoltaic applications and its preparation method. The UV-curable adhesive comprises the following raw materials in parts by weight: 40-60 parts modified acrylate, 10-30 parts acrylate monomer, 20-50 parts tackifying resin, and 1-3 parts photoinitiator. The modified acrylate includes polyurethane acrylate and silicone-modified acrylate, and the tackifying resin is an acrylate copolymer. The UV-curable adhesive of this invention exhibits excellent high-temperature resistance and flexibility, not only reducing the risk of solder joint failure and solder ribbon misalignment during lamination due to UV-curable adhesive failure under high-temperature conditions, but also ensuring good intercalation with the adhesive film during lamination, avoiding interfacial delamination problems. The UV-curable adhesive of this invention also has advantages such as good bonding strength and fast curing speed.

The application discloses a coal-based hard carbon negative material of a sodium ion battery and a preparation method thereof, and the preparation method is as follows: coal powder and starch are uniformly mixed to obtain a coal-based hard carbon precursor; then the precursor is placed in a high-temperature and high-pressure device, the device is heated and pressurized, and the precursor is cross-linked and pre-carbonized, so that the cross-linking degree between the starch and the coal powder is greatly improved; then, the pre-carbonized material after treatment is secondarily crushed, after the crushing is completed, the material is placed in a high-temperature and inert gas atmosphere for carbonization, and finally, the coal-based hard carbon negative material with excellent performance is obtained. The coal-based hard carbon product interlayer distance can be obviously improved, the electrochemical performance of the coal-based hard carbon is improved, and the processing technology is simplified.

This disclosure relates to a method for producing a coating (2), the method comprising applying a coating composition to the surface of a carrier (1), curing the coating composition into a coating (2), and then applying pressure to the coating (2). This disclosure also relates to a method for producing architectural panels, and such architectural panels, and to a method for producing coated foil, and such coated foil.

Provided are a continuous flat pressing surface layer flame-retardant particle board and a preparation method thereof, which can reduce the burning growth rate index of the flame-retardant particle board and the influence of the flame retardant on the surface bonding strength of the particle board. The method comprises: simultaneously atomizing and applying, to raw material particles, 10-15% of the mass of the particles of a melamine modified urea-formaldehyde resin adhesive and 0.5-0.8% of the mass of the particles of a sodium hydroxide aqueous solution with a concentration of 0.4-0.6 mol / L to obtain pretreated surface layer particles, and blending the surface layer particles with a surface layer flame retardant PAP-Mg-Zn at a mass ratio of 100:15-17 to obtain flame-retardant surface layer particles; and laying the flame-retardant surface layer particles and core layer particles in a manner that the surface layer particles are in the upper and lower layers and the core layer particles are in the middle layer, and then continuously flat pressing the board blank at a hot pressing speed of 220-250 mm / s to obtain the continuous flat pressing surface layer flame-retardant particle board. The structural formula of PAP-Mg-Zn is as follows.

The invention discloses boron nitride coated high-strength elastic ceramic nanowire aerogel as well as a preparation method and application thereof, and belongs to the technical field of superelastic inorganic material preparation. Comprising the following steps: taking silicon carbide nanowire aerogel or silicon nitride nanowire aerogel as a framework, uniformly coating boron nitride on the surface of the framework by adopting a chemical vapor deposition method, and forming fixed boron nitride nodes between adjacent or contacted silicon carbide or silicon nitride nanowires. The strength of the prepared ceramic nanowire aerogel can reach 787.0 kPa, and the ceramic nanowire aerogel has good recovery capacity under the compression strain of 80% and is expected to be used as materials for high-temperature heat prevention and insulation, high-performance damping, heat sealing and the like in an extreme environment.

This invention relates to the field of papermaking technology, specifically to a high charge density composite retention and filtration aid, its preparation method, and its application. The invention uses montmorillonite as raw material, acidifying it with sulfuric acid and then treating it with 3-mercaptopropyltrimethoxysilane to obtain modified montmorillonite; subsequently, it is mixed with acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, and 10-undecenal, and polymerized under nitrogen atmosphere using sodium persulfate as an initiator to prepare polymer-modified montmorillonite powder; using linear corn starch as raw material, it is gelatinized and reacted with 3-chloro-2-hydroxypropyltrimethylammonium chloride to obtain cationic starch; the cationic starch is then compounded with polymer-modified montmorillonite to obtain a high charge density composite retention and filtration aid.

This invention relates to the field of polyurea technology and discloses an antistatic waterborne polyurea coating and its preparation method, comprising component A (100 parts by weight of terminal isocyanate prepolymer); component B (6.8-13.7 parts by weight of diamine chain extender, 42-60 parts by weight of polyvinylpyrrolidone copolymer, and 1-4 parts by weight of PVP-modified carbon nanotubes). After modification with PVP dispersant, the carbon nanotubes exhibit better dispersibility in the waterborne polyurea coating, forming a uniform conductive and thermally conductive network, thus improving antistatic and thermal conductivity, while also enhancing the mechanical properties of the polyurea. The polyvinylpyrrolidone copolymer contains hydrophilic carboxyl and amino groups, exhibiting excellent dispersibility in the waterborne polyurea coating. Furthermore, the amino groups can react with the isocyanate groups of the terminal isocyanate prepolymer, thereby forming a three-dimensional chemical crosslinking effect, which synergistically enhances the tensile and tear strength of the polyurea coating.

A method for preparing an ammonia nitrogen-rejecting reverse osmosis membrane based on a support layer with controllable amination degree is disclosed. This invention aims to address the problem of poor selective separation performance of ammonia nitrogen in reverse osmosis membranes prepared based on inert support layers. The method comprises: 1. Synthesizing APAEPO polymer with controllable amination degree; 2. Preparing a polymer support layer with controllable amination degree using a solvent-inducible phase inversion method; 3. Preparing an ammonia nitrogen-rejecting reverse osmosis membrane using interfacial polymerization. This invention allows for flexible control of the membrane's ammonia nitrogen rejection rate (92.2%~99.1%) and water flux by adjusting the amination degree of the support layer (0-80%), meeting the needs of different reclaimed water treatment scenarios (such as low-ammonia nitrogen wastewater reuse and high-ammonia nitrogen wastewater deep purification), thus having a wide range of applications. The preparation process of the amination polymer in this invention does not require the introduction of toxic modifiers, the polymerization reaction conditions are mild, secondary pollution is minimal, and it can be directly industrialized.

The application provides a double-network hydrogel microneedle sensor, a preparation method, a control method and application, and a conductive double-network hydrogel composed of sodium alginate, carrageenan and multi-walled carbon nanotubes is constructed. Based on the hydrogel material, a four-prism microneedle patch is prepared by a mold injection method, and a three-electrode system (a double working electrode) is integrated by a screen printing technology, glucose oxidase and lactate oxidase are loaded respectively, and selective detection of glucose and lactic acid is realized. By utilizing the photothermal effect of the multi-walled carbon nanotubes, the on-demand release of the temperature-responsive probucol nanoparticle hydrogel is realized by controlling the number of infrared light-emitting diodes turned on. The application can not only provide long-term accurate multi-marker monitoring data for patient prognosis, and provide drug release at different rates according to the situation, but also provide theoretical support and practical basis for intelligent diagnosis and treatment of prognosis.

The invention relates to the field of adhesives, and particularly discloses an adhesive for a water-based EAU heat preservation and decoration integrated plate and a preparation method of the adhesive. The adhesive for the water-based EAU heat preservation and decoration integrated plate comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1: (1.2-2); the component A is prepared from the following raw materials: water, acrylic polymer emulsion, nano calcium carbonate, silica powder, a cross-linking agent, a coalescing agent, hydroxyethyl cellulose ether, an anti-freezing agent, a dispersing agent, a defoaming agent, a thickening agent and a sterilizing agent; the component B is prepared from the following raw materials in percentage by mass: cement, quartz powder, quartz sand, a water reducing agent, a retarder and an early strength agent; the preparation method comprises the following steps: respectively preparing the component A and the component B, and uniformly mixing the component A and the component B according to the ratio. The adhesive for the water-based EAU heat preservation and decoration integrated plate has the advantages of being low in VOC, pollution and emission, safe and environmentally friendly.

The invention discloses a silica gel-based material with high biocompatibility and elasticity as well as a preparation method and application of the silica gel-based material. The silica gel-based material with high biocompatibility and elasticity is prepared from bio-based polyurethane and polyether modified siloxane. According to the preparation method, modified polypyrrolidone is taken as a chain extender, glycidyl is taken as an end-capping reagent, a polycaprolactone prepolymer is subjected to chain extension and end capping, bio-based polyurethane is prepared, and the bio-based polyurethane is enhanced through polyether modified polysiloxane, so that the biocompatibility of a silica gel-based material is effectively improved; the tensile property and the compressive deformation resistance of the material are also improved. The silica gel-based material disclosed by the invention can be used for preparing medical catheters or thrombus simulants, and is applied to interventional operations.

The application provides a preparation method of a biological macromolecule bridged alginate salt solvent-resistant gel membrane, selects biological macromolecule blended sodium alginate as a membrane casting liquid, coats the membrane on a non-woven fabric, and then immerses the non-woven fabric in a crosslinking agent solution containing metal ion salt to crosslink and form a membrane, so as to obtain a biological macromolecule bridged alginate salt gel membrane; the application utilizes the physical and chemical action between the biological macromolecule and the alginate salt to change the polymer network structure and improve the crosslinking degree, so that the membrane pore structure is more compact and stable, the gel membrane with high flux, good solvent resistance and strong mechanical property is obtained, and the gel membrane has wide application prospects in solute separation and solvent recovery in various organic solvent systems.

This invention relates to the field of polyurethane materials, specifically to a high-strength, high-toughness, self-healing modified polyurethane material and its preparation method. This invention addresses the problem that existing polyurethane materials are prone to damage, leading to performance degradation and even failure, and lack self-healing capabilities, thus limiting their application in applications requiring high toughness and durability. The preparation method uses polytetramethylene ether glycol and isophorone diisocyanate as main raw materials to prepare the polyurethane material. Adding D-A bond Schiff base tetraol to participate in the reaction enhances the crosslinking degree of the polyurethane material and imparts self-healing properties. Furthermore, 4,4'-dithiodiphenylamine further enhances the self-healing effect. Finally, adding isocyanate-based graphene improves the mechanical properties of the polyurethane material, resulting in a polyurethane material with high strength, toughness, and self-healing properties, thus enhancing the reliability and service life of the polyurethane material in practical applications.

This invention provides a film composition, a film, and a photovoltaic module. The film composition includes a graft-modified matrix resin, and based on 100 parts by weight of the graft-modified matrix resin, the film composition further includes 0.1 to 10 parts of a crosslinking agent and 0.001 to 3 parts of a catalyst. The graft-modified matrix resin has a molecular structure containing C=CH2 double bonds, and the total mass of the C=CH2 double bonds accounts for 0.01 wt.% to 8 wt.% of the total mass of the graft-modified matrix resin. The crosslinking agent has a molecular structure containing Si-H bonds with a functionality ≥2, and the total mass of the Si-H bonds accounts for 0.01 wt.% to 5 wt.% of the total mass of the graft-modified matrix resin. This invention controls the content of C=CH2 double bonds and adjusts the mass ratio of Si-H bonds to achieve low-temperature and efficient crosslinking, thereby realizing the preparation of a film with superior mechanical properties.

The present application relates to a kind of photocuring polyurethane acrylate coating, raw material component is according to 100% mass, including: polyurethane acrylate prepolymer 30~36%, active diluent 5~12%, polyethylene glycol 0.1~0.5%, photoinitiator 1~2%, leveling agent 0.1~1%, the rest is solvent;The active diluent is composed of six functional degree acrylate monomer and double functional degree acrylate monomer.The present application uses six functional degree and double functional degree acrylate compound as active diluent, improves coating crosslinking degree;While introducing polyethylene glycol reduces the friction coefficient of coating surface, through the synergistic effect of body crosslinking enhancement and interface lubrication friction reduction, effectively improves the friction resistance of coating.It is tested that the coating of the present application has no obvious scratch after 0000# steel wire reciprocating friction 3000 times under the condition of 1000g load.

The present application relates to the technical field of acoustic products, and discloses a diaphragm for a micro sound generating device and the micro sound generating device. The diaphragm comprises a rubber film layer formed by cross-linking reaction of an acrylate polymer, wherein the acrylate polymer contains a carboxylic acid group, and the cross-linking agent is an amine cross-linking agent. By using the acrylate polymer containing the carboxylic acid group and the amine cross-linking agent, the cross-linking degree is effectively improved, so that the diaphragm has excellent rebound performance and temperature resistance; meanwhile, the forming mode of the diaphragm is not limited, and the preparation cost is reduced; and the low-frequency performance of the micro sound generating device is also improved, so that the micro sound generating device has full bass and comfortable listening experience.