1454 results about "Polymethyl methacrylate" patented technology

The invention discloses a toughened epoxy resin and a curing method thereof, and relates to the technical field of epoxy resins, the toughened epoxy resin comprises the following components: 100 parts of an epoxy resin matrix, specifically a mixture of bisphenol A epoxy resin and alicyclic epoxy resin, 5-35 parts of a composite amine curing agent, and 5-20 parts of a nano toughening agent, in particular to core-shell rubber particles grafted with epoxy groups on the surfaces, the core layer of each core-shell rubber particle is cross-linked polybutadiene, the shell layer of each core-shell rubber particle is polymethyl methacrylate, 0.5-3 parts of an accelerant comprising a bi-component synergistic accelerant, 1-5 parts of an interface enhancer, and a mixture of gamma-glycidyl ether oxypropyl trimethoxy silane and a titanate coupling agent, a bisphenol A type epoxy resin and a specific proportion of alicyclic epoxy resin are combined to construct an epoxy resin matrix according to a mass ratio of 2: 1, the epoxy resin matrix is matched with a composite amine curing agent prepared by carrying out a special three-step reaction on long-chain polyether diamine, aromatic diamine and anhydride, and key parameters such as molecular weight, functionality and molar ratio of the components are accurately regulated and controlled.

The invention provides a SiO2 / TiO2 / PMMA radiation refrigeration film and a preparation method thereof, and relates to the technical field of passive daytime radiation refrigeration films. The radiation refrigeration film is prepared from the following raw materials: N, N-dimethylformamide, polymethyl methacrylate, silicon dioxide and titanium dioxide. The invention relates to a preparation method of a SiO2 / TiO2 / PMMA radiation refrigeration film. The preparation method comprises the steps of preparing silicon dioxide, preparing titanium dioxide, synthesizing composite sol and preparing the SiO2 / TiO2 / PMMA radiation refrigeration film. The SiO2 / TiO2 / PMMA radiation refrigeration film prepared by the invention has high reflectivity in the ultraviolet-visible-near infrared band and high emissivity in the infrared band, can realize 8.4 DEG C sub-environment refrigeration, and is low in cost and simple in process flow.

The invention discloses a phase change microcapsule modification method which comprises the following steps: S1, selecting a paraffin phase change material or a hydrated salt phase change material, and adding 0.5-1.5 wt% of a chemical stabilizer to modify the thermal stability of the phase change material; s2, compounding a microcapsule wall material by using polyurethane (PU) and nano silicon dioxide (SiO2), and adding 1wt% of carbon nanotubes (CNT) and 0.5-2wt% of nano silicon dioxide (SiO2); s3, the microcapsule wall material is subjected to surface hydrophobic coating treatment, polymethyl methacrylate (PMMA) is sprayed to form a waterproof isolation layer, the modified microcapsule phase change material is obtained, and in the step S1, 0.5-1.5 wt% of graphene oxide (GO) is added for modification when the paraffin phase change material is selected. The preparation method is reasonable in design, energy storage, heat preservation and mechanical properties of PCM-UHPC are remarkably improved through multi-layer composite modification of the PCM microcapsules and the nano-enhancement technology of the UHPC matrix, and the preparation method is suitable for the fields of energy-saving buildings, temperature control infrastructures and the like and has wide application prospects.

The invention relates to a spinel type high-entropy oxide photo-thermal super-hydrophobic anti-icing coating. The anti-icing coating is prepared from the following raw materials in parts by weight: 10 to 20 parts of spinel type high-entropy oxide, 20 to 40 parts of epoxy resin, 1 to 5 parts of stearic acid solution, 1 to 5 parts of polymethyl methacrylate solution, 5 to 10 parts of polydimethylsiloxane, 0.1 to 1 part of flatting agent, 0.1 to 1 part of dispersing agent, 0.1 to 1 part of defoaming agent, 0.5 to 1 part of curing agent and 30 to 60 parts of solvent. The spinel type high-entropy oxide is a powder material with the particle size of 50-600 nm, and the molecular formula of the spinel type high-entropy oxide is (A) 3O4. Meanwhile, the invention further discloses a preparation method of the coating. A coating prepared from the coating disclosed by the invention realizes coupling characteristics of photothermal conversion and super-hydrophobicity, not only has excellent super-hydrophobicity and light absorption characteristics, but also has good performance stability and durability in corrosion and wear environments.

The invention discloses a wearable medical monitoring equipment electrode which is composed of a layered structure and comprises a transparent flexible substrate layer which is made of a biocompatible flexible polymer material and is used for providing flexible support and isolating a metal electrode from the skin; the metal grid copper transparent electrode layer is formed on the surface of the transparent flexible substrate layer through a yellow light etching micro-nano processing technology; the conductive gel layer uniformly covers the surface of the metal grid copper electrode layer; the encapsulation layer is formed by spin-coating a polymethyl methacrylate solution on the surface of the conductive gel layer and forming a transparent protection layer after curing; the gradient line width bionic honeycomb-shaped copper grid design is adopted, the light transmittance is kept, meanwhile, the collection efficiency of physiological electric signals is remarkably improved, signal transmission loss is reduced, through the polyacrylamide and nanocellulose composite gel formula and micro-channel dynamic humidity adjustment, signal stability under long-term wearing is ensured, and the application range is wide. The problem of signal distortion caused by dryness of traditional gel is solved.

The invention discloses a high-RAP-doping-amount cold-mixed asphalt regenerant, and particularly relates to the technical field of asphalt regenerant, the high-RAP-doping-amount cold-mixed asphalt regenerant comprises the following raw materials: hydrogenated extract oil, acetyl tributyl citrate, a low-temperature penetrant, pre-swelling SEBS master batch, a crosslinking catalyst and a microcapsule antioxidant. Molecular-level branched-chain alkyl sodium sulfonate can be wedged into aged asphalt microcracks at the temperature of 65 DEG C, lost light components are balanced and supplemented through hydrogenated extract oil, an SEBS micro-crosslinking network forms an in-situ reinforcement effect at the temperature of 90 DEG C, the triple regeneration effect of regenerated asphalt is achieved, and the service life of the regenerated asphalt is prolonged. Nano-zinc oxide is treated by a silane coupling agent and then is modified by using methyl methacrylate and potassium persulfate, so that the nano-zinc oxide is coated with polymethyl methacrylate, the compatibility of the microcapsule antioxidant and the recycled asphalt can be improved, and the anti-aging performance of the recycled asphalt is improved.

The invention provides a thermoplastic resin composition as well as a preparation method and application thereof. The thermoplastic resin composition is prepared from the following components in parts by weight: 10 to 40 parts of acrylonitrile-butadiene-styrene resin material, 30 to 70 parts of polymethyl methacrylate, 1 to 10 parts of modified hollow ceramic microbeads and 1 to 20 parts of toughening agent, the modified hollow ceramic microbeads comprise hollow ceramic microbeads modified by a coupling agent and stearate. The thermoplastic resin composition disclosed by the invention has the advantages of excellent wear resistance, good sound insulation effect and high surface hardness and impact strength.

The invention discloses a high-temperature-resistant perfluoroether rubber preparation method which comprises the following steps: mixing perfluoroether rubber, modified silicon carbide and modified boron nitride nanosheets, adding a cross-linking agent, uniformly mixing, and carrying out segmented vulcanization to obtain the high-temperature-resistant perfluoroether rubber, wherein in the preparation process of the modified boron nitride nanosheet, nano silicon carbide, the boron nitride nanosheet, polymethyl methacrylate, a catalyst and a solvent are uniformly mixed, the surface of a matrix is coated with the mixture, a thin film is formed through drying, the thin film is sintered and crushed, and an intermediate is obtained; and carrying out graft modification on the intermediate by using a silane coupling agent containing a carbon-carbon double bond to obtain the modified boron nitride nanosheet. The perfluoroether rubber prepared by the invention has good thermal conductivity, high temperature resistance and plasma resistance.

The invention relates to the technical field of BOPP (biaxially-oriented polypropylene) films, in particular to a scratch-resistant adhesive-free matt film and a preparation method thereof, and the scratch-resistant adhesive-free matt film comprises a matt layer, a core layer and a thermal composite layer which are sequentially arranged, the matt layer comprises co-polypropylene, high-density polyethylene, 2.0-2.5 wt% of linear alkyl silicone (the weight-average molecular weight is 12-150 thousands, and the surface tension is 42-45 mN / m) taking maleic anhydride modified aziridine as a terminal group, and 2000-4000 ppm of spherical polymethyl methacrylate (the particle size D50 is 4.0-5.0 microns); the core layer comprises homo-polypropylene; and the thermal composite layer comprises an ethylene-vinyl acetate copolymer and 2000 to 4000 ppm of a spherical anti-blocking agent. According to the scratch-resistant adhesive-free matt film, through collaborative design of the components of the matt layer and the thermal composite layer, balance of scratch resistance, high surface tension (printing applicability) and winding and unwinding smoothness of the surface of the matt layer is achieved, and a solution for the scratch-resistant generality problem of the matt surface of the high-end BOPP matt film is provided.

The invention provides primer coating liquid, a PMMA (polymethyl methacrylate) film as well as a preparation method and application of the PMMA film. The primer coating liquid comprises the following components in parts by weight: 2-6 parts of waterborne polyurethane resin; 1 to 5 parts of hydrophobic polyurethane resin; 2-8 parts of a cross-linking agent; 0.5 to 2 parts of a compatilizer; 0.1 to 0.5 part of a dispersant; 1-6 parts of silicon dioxide particles; and 100 to 120 parts of water. The waterborne polyurethane resin and the hydrophobic polyurethane resin are matched, so that the base film is endowed with more excellent water resistance and chemical stability, the service life of the base film is effectively prolonged, and the overall durability and reliability of the base film are improved; the coating liquid shows excellent dispersity, and is beneficial to improving the transmittance of a base film, so that the light transmission is more efficient.

The invention relates to a polymethyl methacrylate composite material as well as a preparation method and application thereof, and belongs to the technical field of compositions of high-molecular compounds. The polymethyl methacrylate composite material comprises the following components in parts by weight: 70-95 parts of PMMA resin, 2-15 parts of a toughening agent, 3-10 parts of activated shell powder and 1.2-6 parts of a functional additive, the specific surface area of the activated shell powder is greater than or equal to 0.8 m < 2 > / g; the functional additive comprises at least one of an antibacterial agent, a lubricant, an antioxidant and a weather-resistant agent. The polymethyl methacrylate composite material has high wear resistance and high toughness, and the surface of the polymethyl methacrylate composite material is not easy to absorb moisture and become sticky.

The invention discloses a batch processing technology of micro-fluidic chips, and relates to the technical field of chip processing. The method comprises the following steps: firstly, providing at least two layers of polymer coiled materials, namely a first coiled material for forming a micro-channel structure and a second coiled material for closing a micro-channel, the coiled materials are continuous coiled materials selected from polyethylene glycol terephthalate (PET), cycloolefin polymer (COP), polycarbonate (PC) or polymethyl methacrylate (PMMA), and the coiled materials are continuous coiled materials selected from polyethylene glycol terephthalate (PET), cycloolefin polymer (COP), polycarbonate (PC) or polymethyl methacrylate (PMMA); the thickness of the coiled material is 50-500 microns; secondly, carrying out continuous compression molding processing on the surface of the first coiled material through a roll-to-roll processing platform; through a roll-to-roll continuous process, micro-channel mold pressing, functional deposition, precise alignment bonding and online cutting are integrated, high-efficiency, high-consistency and high-integration-level batch manufacturing of the micro-fluidic chip is realized, and manual intervention and production cost are remarkably reduced.

The invention belongs to the field of metal materials, and discloses a preparation method of porous iron, which specifically comprises the following steps: step 1, granulating iron powder, PMMA (polymethyl methacrylate) powder and carbon powder to obtain granulated powder; 2, mixing the granulation powder obtained in the step 1 with solid wax which is solid at normal temperature to obtain a mold pressing material; 3, the mold pressing material prepared in the step 2 is subjected to compression molding, and a green body is obtained; and 4, the green body obtained in the step 3 is degreased, burnt, reduced and sintered, and the finished porous iron is obtained. According to the porous iron, the raw materials are firstly granulated and then mixed with the PE wax, so that the pore effect of the finished product in both macroscopic and microscopic levels is greatly improved, and meanwhile, the invention further discloses the porous iron.

The invention discloses a 6H scratch-resistant acrylic plate as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The acrylic plate comprises a first hardening coating, a PMMA (polymethyl methacrylate) layer and a second hardening coating from top to bottom. The scratch-resistant acrylic plate provided by the invention adopts an innovative hard liquid composition, and comprises polyurethane acrylic resin, an active monomer, metal oxide nanoparticles, a photoinitiator and an auxiliary agent. Compared with an existing scratch-resistant coating material, the scratch-resistant coating material has the advantages that the polyurethane acrylic resin is used as a main film forming substance and is combined with the active monomer and the photoinitiator, so that a high-hardness coating can be quickly formed under a photocuring condition, the formula of the coating is simplified, and the wear resistance, the toughness and the optical performance of the coating are effectively improved; the composition avoids dependence on traditional hardeners and solvents, reduces emission of volatile organic compounds, and is more environment-friendly.

The invention belongs to a material modification technology, relates to high-surface-quality plastic, and particularly relates to preparation and application of a high-glossiness PMMA / PC / ASA composite material, in particular to application of the high-glossiness PMMA / PC / ASA composite material to an automobile exterior trimming panel. The high-glossiness PMMA / PC / ASA composite material is prepared by taking polymethyl methacrylate resin, polycarbonate, a toughening agent, a compatilizer, a coloring agent and an auxiliary agent as raw materials. The invention mainly solves the problem that the surface appearance and performance are difficult to balance when the PMMA / ASA alloy material is compounded with the PC material, thereby obtaining the PMMA / PC / ASA alloy material with high glossiness, high heat resistance and high weather resistance.

Disclosed is a method for preparing one-dimensional platinum diselenide nanobelts, which can simultaneously achieve large-scale, high-quality preparation and self-oriented preparation. The method comprises: (1) preparing a one-dimensional platinum diselenide nanobelt on a SiO 2 (1) spin-coating polymethyl methacrylate (PMMA) on a Si substrate and using electron beam exposure to produce a nanobelt pattern; (2) using a developer to dissolve the PMMA in the exposed part and removing the residual developer with a fixer; (3) using electron beam evaporation to deposit a layer of metal platinum on the substrate, using anhydrous acetone to dissolve the PMMA, and stripping off the metal platinum in the non-nanobelt area to obtain a metal platinum nanobelt; (4) placing the metal platinum nanobelt in the middle position of a tubular furnace, placing a selenium source at an upstream position, and heating the selenium source to 220-300°C; (5) sealing the cavity of the tubular furnace and evacuating it, using nitrogen with a flow rate of 40-70sccm as the carrier gas, heating the cavity to 420-500°C for one hour, and then naturally cooling to room temperature to obtain a platinum diselenide nanobelt.

The invention discloses a waterproof long-lasting oil-control gel composition and a preparation method thereof, and belongs to the technical field of cosmetics. The composition comprises 4-6 parts of an oil absorption compound A, 9-13 parts of an oil absorption compound B and 70-95 parts of a gel matrix, wherein the oil absorption compound A is prepared from mesoporous silica and poloxamer 407, and the aperture of the oil absorption compound A is 5-10 nm; the oil absorption compound B is prepared from polymethyl methacrylate microspheres, isododecane and polyglycerol-3 diisostearate, and the pore diameter of the oil absorption compound B is 150 to 300 nm. According to the invention, through dual mechanisms of temperature response and volatilization driving, a dynamic gradient structure of bottom layer small aperture-surface layer large aperture is formed at skin temperature, and directional migration of grease is realized; meanwhile, the surface property transformation of the material after oil absorption is creatively utilized, a hydrophobic membrane is formed on the surface of the polymethyl methacrylate microsphere, a self-enhanced waterproof barrier is constructed, the unique effect that the more oil is absorbed, the more water is resisted is achieved, the problem of makeup removal caused by sebum and sweat can be effectively solved, and the makeup lasting time is remarkably prolonged.

The invention relates to a perovskite photovoltaic cell high-transmittance low-scattering coating material and a preparation method thereof, and belongs to the technical field of photovoltaic cells. The coating material is prepared from the following components in percentage by weight: 7.2 to 8.5 percent of PMMA (Polymethyl Methacrylate) resin, 0.17 to 0.22 percent of modified nano titanium dioxide, 0.09 to 0.11 percent of flatting agent, 0.03 to 0.04 percent of defoaming agent and the balance of solvent, the modified nano titanium dioxide is prepared into an intermediate through addition reaction of triallylamine and mercaptoethanol, and then a modifier with a network molecular structure is formed through substitution reaction of trifluoropropyl trichlorosilane and hydroxyl at the end part of an intermediate molecule; a thioether chain segment in a modifier molecule and similar nitrogen and oxygen elements form a strong chelation effect to coat the nano titanium dioxide; the introduction of the modified nano titanium dioxide makes up the problem of light transmission reduction caused by traditional titanium dioxide reinforcement.

The invention relates to the field of bimetal composite boards, and discloses a fireproof bimetal composite board and a preparation method thereof.The preparation method comprises the following steps that an aluminum board is selected as a base layer, the upper surface of the aluminum board is coated with a polymeric membrane to form a bonding layer, the upper surface of the bonding layer is coated with a copper board, and the fireproof bimetal composite board is prepared through compounding at the temperature of 150-200 DEG C; the polymeric membrane comprises an ethylene-vinyl acetate copolymer, epoxy resin, polymethyl methacrylate, modified polyglycidyl methacrylate, a composite filler and polyamide. The bimetallic composite plate prepared by the invention is prepared by coating the copper plate with the polymeric membrane on the aluminum plate; the composite filler and the modified polyglycidyl methacrylate are added into the polymeric membrane, so that the peel strength and the mechanical property of the polymeric membrane are improved, and the polymeric membrane is excellent in oxidation resistance and corrosion resistance and high in flame retardant property and fireproof grade.

The invention discloses an inorganic composite phase change energy storage concrete material and a preparation method thereof, belongs to the technical field of concrete materials, and is used for solving the technical problems of poor freeze-thaw resistance and mechanical property of a common concrete material in the prior art. The inorganic composite phase-change micro-capsule cement comprises cement, inorganic composite phase-change micro-capsules, natural coarse aggregate, an air entraining agent and a modified water reducing agent, and is prepared by taking a phase-change material paraffin, fly ash, diatomite and expanded perlite mixture as a core material and a compound of organic modified apatite and polymethyl methacrylate as a wall material. The prepared inorganic composite phase change microcapsule not only has excellent heat storage performance and continuous freeze-thaw resistance, but also has excellent mechanical properties, and can replace fine aggregate in a concrete material, and a modified water reducing agent prepared by addition polymerization of multiple monomers has the advantages of high water reducing rate and good dispersity.

The embodiment of the invention provides a negative electrode active material, a preparation method thereof and a related device. The negative electrode active material comprises a negative electrode active material and a coating layer, the coating layer coats the surface of the negative electrode active material, and the coating layer comprises at least one of polymethyl methacrylate, sodium maleate and oleic diethanolamide borate. According to the technical scheme, the cycle performance and the first-circle coulombic efficiency of the battery can be improved.

The invention discloses a preparation method of a flexible magneto-optical composite material which is low in cost and easy to form, Fe3O4 or CoFe2O4 or NiFe2O4 nanoparticles which have a strong magneto-optical effect but are extremely easy to agglomerate are uniformly dispersed in ZIF-8 with fixed pores by adopting an in-situ symbiosis technology, and PgC5Cu is used for modifying the surface of the ZIF-8 to serve as a bridging agent, so that the ZIF-8 is uniformly dispersed in PMMA (Polymethyl Methacrylate); and the composite material with excellent magneto-optical characteristics is successfully constructed. The innovative design not only maintains the original structural stability and optical transparency of the material, but also endows the material with unprecedented flexibility and machinability, and provides possibility for realizing light weight, portability and flexibility of magneto-optical devices. Compared with traditional pure inorganic magneto-optical crystals, magneto-optical glass and other materials, the preparation method is simple, the production period is short, energy consumption and cost are remarkably reduced, and the material has the advantages of being easy to form, high in flexibility and the like and can adapt to wider application scenes.

The invention provides a toughened polylactic acid blend as well as a preparation method and application thereof, and belongs to the technical field of new materials. According to the invention, poly (p-dioxanone), chitin, polymethyl acrylate, glycerol, polycaprolactone, epoxypropane and polymethyl methacrylate in a specific ratio are adopted as a modified composite material, and the modified composite material and polylactic acid are subjected to melt blending under specific conditions to realize toughening modification of a polylactic acid material. Experiments prove that the toughening type polylactic acid blending material prepared by the method can effectively improve the toughness of polylactic acid, can also improve the degradation speed of polylactic acid, and has a wide application prospect.

The invention relates to a high-wear-resistance nano-particle composite polyester fiber spinning oil agent and a preparation method thereof. The oil agent contains 3-7wt% of an anti-wear agent composed of modified nano-hydroxyl magnesium silicate, polyoxypropylene stearate and polymethyl methacrylate; and 45-55 wt% of a smoothing agent composed of pentaerythritol oleate and trimethylolpropane fatty acid ester. The preparation method of the oiling agent comprises the following steps: firstly, weighing the components according to the weight; sequentially adding a smoothing agent, an emulsifying agent, a penetrating agent, a bundling agent, an antistatic agent, an anti-wear agent and an anti-coking agent; and finally, reacting for 1.5-3 hours at the temperature of 40-50 DEG C and at the stirring speed of 500-900 r / min to obtain the high-wear-resistance nano-particle composite polyester fiber spinning oil. The oiling agent has excellent wear resistance and smoothness, the manufacturing process is simple, and the oiling agent can well meet the spinning process of nano-particle composite polyester fibers.

The invention discloses an artistic mirror based on an acrylic material and a preparation method of the artistic mirror. The artistic mirror comprises a middle PMMA layer, an aluminum coating, an upper protective layer and a lower protective layer, wherein the PMMA layer comprises an anti-aging agent and polymethyl methacrylate; the protective layer comprises a super-hydrophilic self-cleaning protective film layer structure and a protective coating of an aluminum coating. As the art mirror is made of an acrylic material, the image is clear and is not easy to break, and the use safety is greatly enhanced; a layer of high-transparency and super-hydrophilic self-cleaning protective film layer structure is attached to the surface of the artistic mirror, so that the artistic mirror is not easy to fog and stain, the composite coating has antibacterial, anti-ultraviolet and flame-retardant properties and the like due to the addition of components, the related flame-retardant property and service life requirements can be met, and the mirror is light in weight and convenient to carry and install.

The invention relates to the technical field of plastic materials, in particular to a transparent flame-retardant polymethyl methacrylate composite material and a preparation method thereof. The transparent flame-retardant polymethyl methacrylate composite material is prepared from the following raw materials in parts by weight: 75 to 82 parts of polymethyl methacrylate, 15 to 20 parts of acrylate rubber grafted methyl ester acrylate, 15 to 18 parts of a flame retardant, 4 to 7 parts of a toughening agent, 1 to 1.5 parts of a coupling agent, 0.3 to 0.5 part of an antioxidant and 0.3 to 0.5 part of a lubricating agent, the flame retardant is prepared by mixing modified hexaphenoxy cyclotriphosphazene and modified hexa (4-aminophenoxy) cyclotriphosphazene. The transparent flame-retardant polymethyl methacrylate composite material prepared by the invention has multiple advantages, is suitable for the field of electronic and electric appliances requiring high flame retardance, good transparency and excellent mechanical properties, and has relatively high application value and market potential.

The invention discloses a preparation method and an application method of a catalyst for producing aromatic aldehyde by oxidizing agricultural waste lignin, and belongs to the field of lignin resource utilization. The preparation method of the catalyst for producing aromatic aldehyde through lignin oxidation comprises the following steps: mixing lanthanum salt, B-site metal salt and citric acid in a solvent to obtain a precursor solution; and soaking a polymethyl methacrylate template in the precursor solution, reacting, and calcining to obtain the catalyst for producing aromatic aldehyde by lignin oxidation. The catalyst for producing aromatic aldehyde through lignin oxidation, provided by the invention, has the advantages of low cost, adjustable electronic structure, high oxygen mobility, excellent oxidation-reduction performance and the like, has good catalytic performance, and is suitable for being used as a lignin alkali-free oxidation catalyst. The prepared porous catalytic material with micropores, mesopores and macropores is beneficial to mass transfer of lignin macromolecules and the catalyst, beta-O-4 bonds of lignin can be efficiently broken, and alkali-free oxidation production of value-added aromatic aldehyde chemicals is facilitated.

A method for manufacturing a pickleball racket includes the following steps: (a) impregnating a composite material with resin; (b) wrapping a core mold, made of PolyMethylMethAcrylimide (PMI), with at least one location to form an elastic layer; wrapping the composite material around the elastic layer and the core mold to form a composite material layer, to form a semi-finished product; (c) placing the semi-finished product into a mold and heating the mold to a predetermined temperature to form internal pressure within the semi-finished product; (d) stopping heating and cooling the semi-finished product to solidify it; (e) removing a pickleball racket from the mold. The pickleball racket forms an integral structure in the order of a core mold, an elastomer layer, and a composite material layer. The pickleball racket is light in weight and has strength and rigidity. The striking surfaces of the pickle racket has hitting elasticity, and shock absorption.

The invention relates to a binder, an electrode material and a battery. The binder comprises the following preparation raw materials: a temperature-sensitive polymer and a conductive agent, the temperature-sensitive polymer comprises at least one of polyalkyl pyrrole, polyalkyl thiophene, polymethyl methacrylate, ethylene-vinyl acetate copolymer, polypropylene or polyimide. The structure and properties of the temperature-sensitive polymer can be changed when the temperature rises, so that the conductivity, the adhesive property and the mechanical strength of the material are adjusted, the adhesive can automatically insulate reaction in a battery cell and prevent thermal runaway, and the adhesive is good in stability at high temperature, does not decompose or degrade to release toxic gas, and is safe and reliable. The safety performance of the product is greatly improved; by combining with the conductive agent, a network structure with strong adhesive force, good conductivity and high heat conduction efficiency can be formed, and the obtained adhesive has good adhesive force and conductivity at room temperature and excellent insulativity and safety performance at high temperature.

Example embodiments described herein involve a static dome assembly for light detection and ranging (LiDAR) systems. The system may include a base. At least one LiDAR system may be coupled to the base. The at least one LiDAR system may be configured to transmit and receive light having one or more wavelengths. The assembly may further include a housing encompassing the at least one LiDAR system. The housing may be statically coupled to the base. The housing may further include a dome. The dome may include a wall that is transparent to the one or more wavelengths. The wall may also include a high impact polymethyl methacrylate (PMMA) material having an index of refraction of less than 1.55.