27results about How to "Reduce van der Waals forces" patented technology

The invention discloses a high-performance polyacrylonitrile-based carbon fiber and a preparation method thereof, and the preparation method comprises the following steps: proportionally mixing polyacrylonitrile, a solvent and a plasticizer, heating and stirring to obtain a uniform spinning solution; the plasticizer is diphenyl phthalate, bisphenol A-bis (diphenyl) phosphate ester or resorcinol bis (diphenyl) phosphate ester; spinning the spinning solution to prepare a polyacrylonitrile fiber precursor; carrying out hot drawing treatment on the polyacrylonitrile fiber precursor, and then carrying out pre-oxidation and carbonization treatment to obtain polyacrylonitrile-based carbon fibers; the pre-oxidation temperature ranges from 200 DEG C to 300 DEG C, and the pre-oxidation time ranges from 80 min to 160 min. The preparation method of the carbon fiber can effectively improve the spinnability and the draftability of the PAN fiber, and can promote the crystallinity and the graphitization degree of the carbon fiber to be improved, so that the mechanical property of the fiber is enhanced.

The invention relates to the technical field of polyester fibers, in particular to a modified polyester fiber and a preparation method thereof.The modified polyester fiber is prepared from, by weight, 92-95% of modified copolyester and 5-8% of modified graphene. The modified polyester fiber disclosed by the invention has the advantages of good compatibility of all components, good antistatic and antibacterial effects, and better tensile property, moisture-resistant stability and aging resistance at the same time.

The invention relates to the technical field of coatings, in particular to an easy-to-clean coating material and a preparation method thereof.The coating material is prepared from, by weight, 100 parts of inorganic silicate solution, 5-10 parts of filler, 0.5-2 parts of dispersing agent, 0.5-2 parts of defoaming agent, 0.5-2 parts of flatting agent, 10-20 parts of super-hydrophilic functional component and 20-60 parts of deionized water; the super-hydrophilic functional component is a silanized carbon nano tube loaded with nano zinc oxide. Compared with the prior art, the coating obtained by the invention has excellent hydrophilicity, strong adhesive force, qualified impact resistance and easy cleaning compared with the coating obtained by a contrast, and in addition, the easy-to-clean coating material is simple in preparation method, can be prepared at room temperature, and can be produced on a large scale.

The invention relates to the technical field of ceramic powder, in particular to high-performance ceramic composite spraying powder and a preparation method thereof.The preparation method comprises the steps that a carbon layer is deposited on the surface of nano silicon carbide powder, acid treatment is conducted, and modified nano silicon carbide powder is obtained; preparing aluminum oxide powder and zirconium oxide powder into a suspension; adding modified nano silicon carbide powder into the suspension, and filtering, washing, drying, ball-milling and sieving the formed precipitate to obtain a composite material; the composite material and silicon boride powder are fully mixed, and the high-performance ceramic composite spraying powder is prepared. According to the preparation method, the nano silicon carbide powder is subjected to deposition treatment and acid treatment in sequence, so that the nano silicon carbide powder, the aluminum oxide powder and the zirconium oxide powder can be fully mixed, dispersed and combined, the non-uniform dispersion of the nano silicon carbide powder caused by agglomeration is prevented, and then the silicon boride powder with relatively small particle size is added; the self-healing performance of the ceramic composite spraying powder on surface cracks is improved, so that the quality of the ceramic composite spraying powder is greatly improved.

The present application relates to the technical field of polyethylene pipes, and in particular to a modified graphene oxide and a polyethylene modified composite pipe and a preparation method thereof. The modified graphene oxide has the following preparation method: S1, respectively preparing equimolar amounts of diethanolamine solution and anhydride solution, mixing and stirring to obtain a polyamide-ester monomer; the anhydride is a mixture of phthalic anhydride and succinic anhydride; S2, using toluene as a water-carrying agent and toluenesulfonic acid as a catalyst, the polyamide-ester monomer obtained in S1 is reacted with propylene glycol to obtain a hyperbranched polyamide-ester; S3, using toluene as a water-carrying agent and toluenesulfonic acid as a catalyst, the hyperbranched polyamide-ester obtained in S2 is reacted with graphene oxide to obtain a modified graphene oxide; the modified graphene oxide has the advantages of reducing the curling rate of graphene oxide in the system and improving the mechanical properties of the polyethylene pipe.

The invention discloses a composite solution for realizing a temperature sensing function of a cement-based material, a temperature sensor and a preparation method of the temperature sensor, and the composite solution comprises the following components in parts by mass: 0.2-0.4 part of carbon nanotubes; 1-3 parts of a super plasticizer; 8 to 14 parts of ethylene-vinyl acetate copolymer emulsion; and 18-22 parts of water. According to the invention, the ethylene-vinyl acetate copolymer emulsion and the super plasticizer are added while the carbon nanotubes are added into the cement-based temperature sensing composite solution, so that not only can the dispersion uniformity and stability of the carbon nanotubes be improved, but also a carbon nanotube conductive network coated with a polymer film surface can be formed in a cement hydration process. When used as a sensor under natural conditions, the sensor has a good temperature self-monitoring function. And especially under the negative temperature condition, the temperature identification accuracy and stability of the sensor can be effectively improved.

The invention discloses a method for optimizing the cycle performance of a battery, a current collector and a pole piece, diphenylmethane diisocyanate and nano crystalline cellulose are doped into conductive slurry, the mixture is uniformly mixed and then coated to a foil material to prepare the current collector, and the current collector is adopted to prepare the pole piece of the battery. According to the invention, trace nano crystalline cellulose and diphenylmethane diisocyanate are introduced into the conductive layer of the current collector, so that irreversible deformation of a pole piece after long-time charging and discharging of the battery can be prevented, and the influence of non-uniform density distribution of a conductive layer surface caused by agglomeration of particles in conductive slurry on the cycle performance of a battery end can be avoided; and the cycle performance of the battery is obviously improved.

The present application relates to a kind of synergistic flame-retardant low melting point polyester chip for polyester sheath-core and its preparation method, the melting point of product is reduced by introducing part of asymmetric isomer of terephthalic acid in esterification process, while introducing part of symmetric structure alcohol with small difference with ethylene glycol, the chain regularity is less damaged, a small amount of introduction will not significantly damage the crystallization ability of product while reducing the melting point. After esterification, by means of blending and co-melting and alcoholysis repolymerization, flexible chain segment (‑O‑(CH2)4‑O‑) with fast crystallization speed is introduced to improve the crystallization performance of product, and finally the modified synergistic flame retardant is added. Nitrogen, phosphorus and silicon elements are introduced into the product chain segment during polycondensation reaction, and a triple protection system covering condensed phase, gas phase and interface is formed through the multidimensional complementary action of the three elements during combustion. Through the above steps, polyester chip for polyester sheath-core with high flame retardancy, low melting point and high crystallinity is finally synthesized.

The invention discloses a skin-nourishing makeup-maintaining liquid foundation for oily skin, which comprises a water phase and an oil phase, and also comprises bis-diglycerol polyacyl adipate, trimethylsiloxy silicate ester, titanium dioxide subjected to surface treatment and toner, the bis-diglycerol polyacyl adipate-2, the titanium dioxide subjected to surface treatment, the toner and the trimethylsiloxy silicate ester are pretreated and then mixed with the water phase and the oil phase, the liquid foundation obtained through the method is fine and smooth and fit, the makeup effect durability is good in oily skin test, and the liquid foundation can preserve moisture and control oil.

The invention relates to the field of spherical silicon micropowder preparation, and discloses a method for preparing spherical silicon micropowder for LED display device packaging material. The method comprises the following steps: taking fatty alcohol polyoxyethylene ether, anhydrous ethanol, a sodium silicate solution and ethyl acetate to react to obtain a filter cake; adding PEG1500 to the filter cake to obtain powder A; calcining the powder A in a nitrogen atmosphere and an air atmosphere in sequence to obtain a primary product; taking the primary product and adding sodium chloroacetate to react to obtain a carboxylation primary product; taking the carboxylation primary product and adding thionyl chloride to react to obtain an acyl chloride primary product; and modifying the acyl chloride primary product with an antioxidant to obtain the spherical silicon micropowder. According to the invention, PEG1500 is added and calcined in nitrogen and air atmospheres to block high-temperature hard agglomeration of particles, and an antioxidant is modified on the surface of the primary product, which is beneficial to the dispersion of the spherical silicon micropowder in an organic matrix of an epoxy molding compound, and at the same time, the epoxy molding compound is given more excellent mechanical properties and antioxidant properties.

The invention belongs to the technical field of nano-antibacterial materials, and provides a micromolecule coated nano-zinc oxide monodisperse antibacterial colloid, the colloid comprises nano-zinc oxide powder, a dispersant and water, the total mass ratio of the nano-zinc oxide powder to the dispersant is (1: 1)-(10: 1), the mass ratio of the nano-zinc oxide powder to the water is (1: 100)-(1: 10000), the total mass ratio of the nano-zinc oxide powder to the dispersant is (1: 1)-(1: 10000), and the mass ratio of the nano-zinc oxide powder to the water is (1: 100)-(1: 10000). The diameter of the nano zinc oxide particles in the colloid is 60 nm to 100 nm. According to the invention, the micro-molecular dispersant is introduced to modify the nano-zinc oxide, and the total mass ratio of the nano-zinc oxide powder to the dispersant and the mass ratio of the nano-zinc oxide powder to water are optimized, so that the nano-zinc oxide can be completely coated with the nano-zinc oxide powder by micro-molecules, and the surface energy of the nano-zinc oxide and Van der Waals force and electrostatic attraction among particles are reduced; and the dispersion performance of the nano-zinc oxide in water can be improved.

The invention relates to a hydroxyl-rich defective carbon nitride rare earth adsorbent as well as a preparation method and application thereof. The hydroxyl-rich defective carbon nitride rare earth adsorbent is prepared from the following raw materials: a precursor, alkali metal chloride, ammonium chloride and water, a precursor, alkali chloride, ammonium chloride and water are mixed to obtain a mixture, the obtained mixture is subjected to an ion-induced thermal polymerization strategy, and the hydroxyl-rich defective carbon nitride rare earth adsorbent is prepared and has an expanded nanopore structure; the hydroxyl-rich defective carbon nitride rare earth adsorbent has the advantages of high adsorption capacity, rapid adsorption kinetics, high selectivity and good cycle stability, the recovery efficiency of rare earth ions in ore leaching tail liquid is high, the preparation raw materials are low in price, and the preparation process is simple.

The invention relates to the technical field of conductive coatings, in particular to an electrostatic attraction type graphene conductive coating solution and a preparation method thereof. The surface active agent is added into the solution, so that the surface tension of the solution can be effectively reduced, graphene is prevented from being agglomerated in the coating solution, and the graphene in the solvent is dispersed more uniformly. The anionic surfactant and the cationic surfactant are used at the same time, bonding between graphene sheet layers and bonding between graphene and a copper wire are firmer by means of mutual attraction of positive and negative charges ionized from a solution, the surface roughness of the coating is effectively reduced, the graphene sheet layers are not prone to falling off, and the graphene coating is more stable. And good continuity of graphene in the coating is maintained. The bonding effect of the graphene and the copper wire can be improved, and the conductivity of the copper wire is improved.

The invention relates to the technical field of polyethylene pipes, in particular to modified graphene oxide and a polyethylene modified composite pipe and a preparation method thereof.The preparation method of the modified graphene oxide comprises the following steps that S1, a diethanol amine solution and an anhydride solution which are equal in molar weight are prepared respectively, and a polyamide-ester monomer is obtained through mixing and stirring reaction; the anhydride is a mixture of phthalic anhydride and succinic anhydride; s2, by taking toluene as a water-carrying agent and toluenesulfonic acid as a catalyst, reacting the polyamide-ester monomer prepared in the step S1 with glycerol to obtain hyperbranched polyamide-ester; s3, by taking toluene as a water-carrying agent and toluenesulfonic acid as a catalyst, reacting the hyperbranched polyamide-ester prepared in S2 with graphene oxide to obtain modified graphene oxide; the method has the advantages that the curling rate of graphene oxide in a system is reduced, and the mechanical property of the polyethylene pipe is improved.

The present disclosure relates to an organic compound including a benzoxazole group and a spirocyclic structure shown in Formula I and its use as an electron transport material. In the disclosed compound structure, the benzoxazole group has a higher electron affinity, so that it has excellent electron conduction characteristics, and the benzoxazole group has a lower LUMO energy level, and the electrons can be effectively transmitted to the light-emitting layer, so that the recombination probability of electrons and holes in the light-emitting layer is increased, and the device shows a high luminous efficiency; the spirocyclic structure has an orthogonal spatial stereo configuration, and the van der Waals force between molecules can be reduced, which is beneficial to prevent the crystallization of the electron transport material, and the structure is made more rigid at the same time, so that the compound has a higher glass transition temperature, and the film forming property and thermal stability of the compound are improved. Therefore, the disclosed compound is used as an electron transport material for an organic electroluminescent device, and the device can be made to have a lower voltage and good luminous efficiency and a longer service life.

The invention discloses a high-content graphene pre-dispersion for epoxy resin and a preparation method of the high-content graphene pre-dispersion, and relates to the technical field of carbon material dispers.The preparation method comprises the following operation steps that an epoxy diluent, a dispersing agent and a stabilizer are evenly mixed for 10-30 min at the rotating speed of 200-1000 r / min, and a dispersion carrier is obtained; the preparation method comprises the following steps: uniformly mixing graphene with a dispersion carrier, and grinding by a three-roller machine to obtain a high-content graphene pre-dispersion; the high-content graphene pre-dispersion is applied to epoxy resin and a binder.

The invention provides a marine fuel synergist and a preparation method thereof, and the marine fuel synergist specifically comprises the following raw materials by weight: 50-65 parts of a cleaning synergist; the part number of the tension cyclic hydrocarbon is 20 to 40; 5 to 15 parts of a nitro compound; the cleaning synergist is aviation 3 # jet fuel treated by a fuel additive production device, and the high-tension cyclic hydrocarbon is one or more of a cyclopropane derivative, a cyclobutane derivative, a cyclopropene derivative, a cyclobutene derivative and a tricycloalkane derivative. The nitro compound is one or more of nitromethane, nitroethane and nitropropane. By adding the fuel synergist, sufficient combustion of marine fuel oil is achieved, emission of harmful substances such as carbon monoxide, hydrocarbon, oxynitride and particulate matter can be reduced at the same time, and the problem of carbon deposition at positions such as an air inlet valve, an oil nozzle and a combustion chamber of an engine is effectively solved and inhibited.

The invention discloses an online crushing device and method for carbon nanotube fibers. An atomizing nozzle sprays a graphene oxide aqueous solution into a collecting device, so that the carbon nanotube aerosol and the graphene oxide water are easily and fully contacted to form composite fibers. A heating component heats the collecting device. The composite fibers inside the collecting device evaporate along with the water in a high temperature and inert atmosphere. The graphene oxide is in situ attached to the carbon nanotube wall or the surface of the tube bundle under the capillary action. The graphene oxide is deoxidized and reduced in the heating zone, releasing a large amount of gas, and the carbon nanotube fibers are crushed into a powder state. Since the nano-sized spatial steric hindrance of graphene oxide can prevent the tube bundles of the carbon nanotube aerosol from aggregating, the van der Waals force between the carbon nanotubes is reduced, which is conducive to crushing. No metal impurities are introduced into the online crushing device and method for carbon nanotube fibers, and the microstructure of the carbon nanotubes is not damaged, thereby ensuring its excellent electrical properties, and the crushing efficiency of the carbon nanotube fibers is high and the cost is low.

The invention discloses an anti-aging sealing strip material and a preparation method thereof.The anti-aging sealing strip material is prepared by enabling chlorine atom sites on pretreated silicone rubber and alcoholic hydroxyl groups on a modified additive to react under the action of triethylamine of the pretreated silicone rubber and the modified additive, and the anti-aging sealing strip material contains a hindered phenol structure, so that the anti-aging performance of the anti-aging sealing strip material is improved, and the service life of the anti-aging sealing strip material is prolonged. The hindered phenol structure can capture free radicals and convert peroxy free radicals into hydroperoxide so as to prevent linkage oxidation reaction caused by the free radicals, the molecular structure contains a large number of unsaturated double bonds, the unsaturated double bonds are of flexible structures, the electron cloud density is low, the van der Waals force between molecules can be weakened, and meanwhile, due to the existence of the polyrotaxane structure, the molecular structure can be used for preparing the polymer. According to the present invention, with the introduction of the disulfide bond and the elastomer structure, the material does not deform under the long-term compression state so as to ensure the sealing effect;

The invention belongs to the technical field of PET sheets, and particularly relates to an energy-saving type polyester PET sheet and a production method thereof.The energy-saving type polyester PET sheet comprises two body layers, a reinforcing layer is arranged between the two body layers, and the reinforcing layer is bonded with the body layers; wherein the body layer is prepared from the following raw materials in parts by weight; the invention relates to a PET (polyethylene terephthalate) composite material, which is prepared from the following components in parts by weight: 80 to 100 parts of PET resin, 2 to 5 parts of dioctyl phthalate, 0.5 to 1 part of polyethylene wax, 0.1 to 0.3 part of hindered phenol antioxidant and 0.2 to 0.5 part of zinc stearate. The molecules of the added dioctyl phthalate are small and can be inserted between PET molecular chains to increase the degree of freedom of motion between the molecular chains, so that the glass transition temperature of the PET resin can be reduced, mutual attraction between the molecular chains is reduced, the molecular chains are easier to move, the PET temperature in a molten state is reduced, and the PET film has the advantages of being high in heat resistance, good in heat resistance and the like. Meanwhile, the PET melt has good fluidity, so that the low-temperature production of the PET sheet is realized, the energy loss in the production process is reduced, and the energy-saving property of the production process is improved.

The invention discloses a composite hydrogen storage material based on invalid hydrogen storage alloy powder and a preparation method thereof.The preparation method comprises the following steps that waste hydrogen storage powder alloy blocks are crushed in an inert atmosphere under the hammer type impact effect, the impact pressure is 10-90 MPa, and the waste hydrogen storage powder alloy blocks form mechanical tablets while being crushed; and after the crushed powdered alloy is screened, the crushed powdered alloy is uniformly mixed with an aerosol lubricant in proportion, and the mixing process is carried out in an inert atmosphere. The aerosol lubricant and the treated and recycled hydrogen storage alloy are used for preparing the composite hydrogen storage material, so that the powder fluidity is improved, crushing, compaction and stress accumulation in the circulation process are reduced, the resource utilization rate is increased, and environmental pollution is reduced.

The present invention relates to the technical field of inorganic materials, and discloses a highly dispersed barite powder and a preparation method thereof. The cation and anion groups in a betaine-type dispersant can produce strong adsorption and steric hindrance effects on the surface of barite, achieve strong inhibition of polymers, effectively prevent particles from aggregating with each other, reduce the average particle size of the barite powder, increase the electrostatic repulsion between the barites, and effectively improve the dispersion effect of the barites; the carboxylate and sulfonate groups dissociated in the disodium betaine structure can form a complex with barium ions on the surface of barium sulfate particles through ion exchange, generate electrostatic stability and play a role in particle dispersion, and the hydrophilic group with a positive charge at the other end forms an organic shell layer of a certain thickness on the surface of the barite particles, so that the van der Waals force between the particles is weakened, the sedimentation rate and sedimentation volume of the barite powder in the system are reduced, and the dispersion stability is improved.

The application discloses a preparation process of modified activated carbon for benzene adsorption of natural gas, and comprises the following steps: S1, graphite powder and milk are weighed according to a mass ratio of 1:100, and the weighed graphite powder is added into the weighed milk to be mixed to obtain a mixed solution; S2, the mixed solution in the step S1 is added into a homogenizer to be peeled, the setting pressure of the homogenizer is 50-100 MPa, and the homogenizer is circulated for 10-50 times to obtain a graphene dispersion liquid; and S3, the graphene dispersion liquid in the step S2 is washed by hot water at 60-80 DEG C to remove protein and lecithin in the solution, and the washing times are 3-8 times. The application effectively solves the problems of small activated carbon adsorption capacity, poor selectivity, complex process and high cost in the prior art.

The invention belongs to the field of material preparation, and discloses a method for carrying out steam-assisted coplanar stretching orientation on a two-dimensional lamella, the method can be used for carrying out isotropic stretching and steam treatment on a film material containing the two-dimensional lamella at the same time, and steam adopted in the steam treatment contains plasticizing steam. The plasticizing steam is formed by evaporating a plasticizing solvent which has a plasticizing effect on the two-dimensional sheet layer. According to the preparation method, the interlayer Van der Waals force can be weakened, the deformability of the sheet layers can be improved, meanwhile, wrinkles, wrinkles and other irregular forms of the sheet layers are removed or reduced through isotropic stretching, so that the sheet layers can be assembled more uniformly, the assembly orderliness of the sheet layers is improved, the interlayer binding force is increased, the orientation degree of a sheet layer stacking area is improved, and the sheet layers can be assembled more uniformly. The overall performance of the membrane is enhanced.

The utility model relates to an exposure equipment and exposure platform thereof. The exposure platform comprises a base and a plurality of support bosses arranged on the base. The upper surface of the support boss is a support surface. The support surfaces of the support bosses are located on the same horizontal plane. Adjacent support bosses form a hollow area. The support surfaces of at least some support bosses are provided with suction holes. The plurality of support bosses are arranged on the base. The support surfaces of the support bosses are located on the same horizontal plane to ensure the flatness of the battery piece. The support surfaces of at least some support bosses are provided with suction holes to adsorb and fix the battery piece. Adjacent support bosses form a hollow area to reduce the generation of a vacuum layer between the battery piece and the exposure platform, reduce the contact area between the battery piece and the exposure platform, and reduce the van der Waals force between the battery piece and the exposure platform. The battery piece and the exposure platform are easily separated, the battery piece is not broken when the fork contacts the battery piece, and the mask is not scratched by the fragments.

The invention provides preparation of a modified antimony tin oxide water-based antibacterial colloid and application of the modified antimony tin oxide water-based antibacterial colloid in a heat-insulating glass coating. The modified antimony tin oxide material comprises antimony tin oxide grafted or coated with small molecules and a dispersing agent on the surface; wherein the small molecule polyethylene glycol-2000 dispersing agent is sodium polyacrylate (food grade), sodium hexametaphosphate (food grade) and sodium methylene bis-naphthalene sulfonate (analytically pure), after stirring dispersion and ultrasonic dispersion are conducted to be uniform, grinding dispersion is conducted through a sand mill, and 0.2 zirconium oxide beads serve as a grinding medium. The industrial production is easy; no waste is generated; and the like.

The invention discloses dispersed yttrium oxide powder as well as a preparation method and application thereof.The preparation method comprises the following steps: firstly, weighing the following raw materials in percentage by mass: 0.5% of yttrium oxide powder and the balance of distilled water; the addition amount of the polyoxyethylene is 0.5-1.5% of the mass of the yttrium oxide powder; mixing the weighed yttrium oxide powder and polyoxyethylene in distilled water to form a suspension, and dispersing the suspension by using an ultrasonic dispersion machine; loading the suspension into a culture dish, and placing the culture dish in a drying oven for vacuum drying to volatilize polyoxyethylene and water; and finally, taking out the culture dish from the oven, and naturally cooling to room temperature to obtain dispersed yttrium oxide powder in the culture dish. According to the invention, the surface charge of yttrium oxide particles and the effect of Van der Waals force are reduced, and the yttrium oxide powder with excellent fluffy dispersion effect is prepared.