119 results about "Tio2 nanoparticles" patented technology

Disclosed in the present invention are a fluorosilicone-modified low-surface-energy antifouling coating and a preparation method therefor. The coating comprises the following components in parts by weight: 11-15 parts of butyl acrylate, 3-4 parts of dodecafluoroheptyl methacrylate, 3-4 parts of vinyl-terminated polydimethylsiloxane, 3-4 parts of 2-hydroxy-4-acryloyloxybenzophenone, 30-38 parts of methyl isobutyl ketone, 0.15-0.25 parts of azobisisobutyronitrile, 0.1-0.2 parts of sodium hydroxide, 2-3 parts of modified titanium dioxide nanoparticles, and 0.5-1.5 parts of 3-aminopropyltriethoxysilane. In the present invention, vinylpentamethyldisiloxane reacts with decamethylcyclopentasiloxane to prepare vinyl-terminated polydimethylsiloxane; a titanium dioxide precursor is mixed with polydopamine nanoparticles for modification to prepare modified titanium dioxide nanoparticles; and then the components above are mixed to prepare the fluorosilicone-modified low-surface-energy antifouling coating. The coating has low surface energy and good adhesion and ultraviolet resistance.

The invention discloses a super-hydrophobic road ice-inhibiting coating based on a photothermal effect and nano modified particles and a preparation method of the super-hydrophobic road ice-inhibiting coating. The preparation method comprises the following steps: introducing silane modified nano silicon dioxide (SiO2) and titanium dioxide (TiO2) particles into a polyaniline solution, and preparing the composite super-hydrophobic powder through a chemical oxidation polymerization method. The preparation method comprises the following steps: firstly, modifying the surfaces of SiO2 and TiO2 nanoparticles by adopting a silane coupling agent, and endowing the SiO2 and TiO2 nanoparticles with low surface energy and hydrophobic property; and then adding the modified nano-particles into an aniline monomer solution, reacting with doped acid and an oxidizing agent, so that polyaniline molecules are subjected to in-situ polymerization on the surfaces of the particles, and the composite super-hydrophobic powder with a micro-nano structure is formed. The obtained composite material has excellent photothermal conversion performance and super-hydrophobic performance at the same time, and the efficient photothermal material heat absorption ice melting effect and the synergistic ice restraining effect of the photothermal material and the super-hydrophobic material can be achieved. Compared with a traditional ice-inhibiting coating, the coating disclosed by the invention shows stronger ice-resisting capability in a low-temperature and high-humidity environment, has good durability, mechanical stability and environmental protection property, and is suitable for the field of ice prevention and ice inhibition in cold regions such as roads, bridges, airport runways and the like.

A magnetic nanoparticle composite microcapsule, and a preparation method therefor and the use thereof. The preparation method comprises: diluting concentrated ammonia water with absolute ethanol in which nano-Fe3O4 is dispersed, stirring same and adding ethyl orthosilicate, centrifuging same, and then performing washing to obtain Fe3O4 / SiO2 particles; dispersing same in anhydrous ethanol, then adding isopropanol containing tetrabutyl titanate, and performing a treatment to obtain Fe3O4 / SiO2 / TiO2 nanoparticles; adding polyurethane TDI prepolymer to the Fe3O4 / SiO2 / TiO2 nanoparticles, adding same to a core material, then dripping an emulsifier, and stirring same to obtain a core material emulsion; and heating same in a water bath, dropwise adding butanediol, and performing heating, stirring and vacuum filtration to obtain a magnetic nanoparticle composite microcapsule. By means of the loading with a core material having a repair function, the prepared magnetic microcapsule can actively repair damage to an insulating material caused by electrical and mechanical stress, thereby improving the reliability of a device.

The invention discloses a waterborne polyurethane composite material as well as a preparation method and application thereof. According to the innovative material, PTMG / PCDL-WPU is taken as basic resin, and silicon dioxide coated titanium dioxide (SiO2 and TiO2) nanoparticles are introduced in a physical blending manner, so that the composite waterborne polyurethane material with excellent performance is constructed. The compounded WPU shows remarkably enhanced mechanical properties and waterproof performance, specifically, the tensile strength is 47MPa, the elongation at break is 780%, and the water absorption is 16%. The developed WPU can significantly improve the hydrostatic pressure resistance of fabrics, provides a new solution for functional modification and structural enhancement of polyamide / polyester flexible textile composite materials, and has important industrial application prospects.

The invention belongs to the technical field of textile materials, and discloses an easy-to-dye composite polyester fiber and a preparation method thereof. The preparation method comprises the following steps: by taking polyethylene glycol terephthalate as a core layer and low-melting-point polyester as a skin layer, carrying out melt spinning to prepare skin-core composite fibers; after heating and melting a skin layer, bombarding by using a titanium dioxide nano particle flow to obtain roughened fibers; after plasma treatment, dipping with an activating solution of triethylamine and 4-methylbenzenesulfonyl chloride to obtain activated fibers; carrying out ultrasonic reaction on the activated fiber and a modifier under the catalysis of tetrabutyl titanate, and washing and drying to obtain the easy-to-dye composite polyester fiber. The prepared composite polyester fiber not only has the advantage of being easy to dye, but also has excellent antibacterial performance and flame retardant performance, and the quality of the composite polyester fiber is effectively guaranteed.

The invention discloses a formaldehyde-free composite board for a cabinet and a preparation method of the formaldehyde-free composite board, and relates to the technical field of artificial board manufacturing. The preparation method of the formaldehyde-free composite board for the cabinet comprises the following steps: mixing high amylose with a choline chloride / urea deep eutectic solution, stirring, adding concentrated hydrochloric acid for reaction, adjusting the pH value, and adding ammonium persulfate to obtain pretreated oxidized starch; methacrylic acid dehydrated glyceride is added into the pretreated oxidized starch for a grafting reaction, then modified polyvinyl alcohol is added for blending, sodium metaphosphate is added for crosslinking, finally, heating and curing are conducted, modified titanium dioxide nanoparticles are added, and the formaldehyde-free starch adhesive is obtained. The wood shavings and the formaldehyde-free starch adhesive are mixed, and a core material is obtained; and arranging the core material between the formaldehyde-free veneers, and carrying out hot press molding to obtain the formaldehyde-free composite board. The formaldehyde-free composite board for the cabinet has excellent mechanical strength, bonding performance and water resistance.

The invention relates to a super-amphiphobic coating with a dual self-repairing function and a preparation method of the super-amphiphobic coating. According to the super-amphiphobic coating, crack self-repairing is achieved through dynamic disulfide bonds, and low-surface-energy substance self-repairing is achieved through microcapsules. The preparation method comprises the following steps: firstly, modifying hydroxyl-terminated polydimethylsiloxane by using an isocyanate prepolymer containing disulfide bonds, then modifying TiO2 nanoparticles by using 3-aminopropyltriethoxysilane and octadecyltrimethoxysilane, and preparing a microcapsule which takes polyamide as a shell and perfluorooctyltriethoxysilane as a core material, and finally, carrying out ball-milling mixing on the disulfide bond-containing polyurethane modified organic silicon resin, the modified TiO nanoparticles, microcapsules and 2-hydroxy-2-methyl propiophenone, and spraying the mixture on the surface of a base material to obtain the super-amphiphobic coating with the dual self-repairing function. According to the super-amphiphobic coating with the dual self-repairing function and the preparation technology thereof, the coating achieves high durability through dual self-repairing, and the hydrophobic and oleophobic performance is high.

The invention provides a preparation method and application of a high-sensitivity imprinted membrane for selectively detecting microcystic toxins (MC-LR) in water based on surface enhanced Raman scattering. The preparation method comprises the following steps: step 1, preparation of silver nanocubes; step 2, preparation of Ag NCs-coated TiO2 nanoparticles; step 3, preparation of an Ag NCs-coated TiO2 / PDMS composite membrane; according to the invention, a membrane technology, an SERS technology and MIT are combined, so that the prepared product has excellent physical and chemical properties of a PDMS membrane, high sensitivity of an SERS detection technology and high selectivity of MIT; the invention provides a new method for SERS detection and widens the application range.

The invention relates to the technical field of photocatalytic processes, in particular to a catalyst for preparing methanol through photocatalytic reduction of CO2 as well as a preparation method and application of the catalyst. The catalyst comprises a composite carrier and active sites dispersed on the surface or in pores of the composite carrier, the composite carrier is of a heterojunction composite structure formed by a hollow TiO2 sphere and MCN, the hollow TiO2 sphere comprises a shell layer and a spherical cavity structure located in the shell layer, the shell layer is formed by TiO2 nanoparticles, and the MCN has a mesoporous pore structure; a II-type or Z-type heterojunction interface is formed between the hollow TiO2 spheres and the MCN through physical contact and chemical action; the active sites comprise copper nano species, sulfur vacancy defects and amino groups; the copper nano species are copper nano particles or clusters, and the valence state of copper is 0 and / or + 1 valence amino is grafted on the surface of the composite carrier through an organic long chain. The catalyst provided by the invention can greatly improve the yield and selectivity of methanol prepared by photocatalytic reduction of carbon dioxide.

The invention relates to a microencapsulated thermochromic material. The microencapsulated thermochromic material comprises an inner core and a shell coating the inner core, the shell is prepared from melamine formaldehyde resin and anti-ultraviolet composite particles according to the volume ratio of (70 to 60) to (30 to 40); the inner core is a mixture of an electron transfer type organic compound and an inorganic phase change reinforcing agent, and the inorganic phase change reinforcing agent is composed of TiO2 loaded with 5-15 wt% of AgI nanoparticles; the anti-ultraviolet composite particles are formed by grafting silane coupling agent modified nano zinc oxide and a benzotriazole ultraviolet absorbent. The invention further relates to a color-changing floor prepared from the microencapsulated thermochromic material, and the color-changing floor is good in weather resistance and high in heat stability and temperature sensitivity.

The invention belongs to the field of new materials, and particularly relates to a super-hydrophobic composite coating with mechanical firmness, self-cleaning property and high wear resistance, a method and application thereof. According to the preparation method, epoxy resin (E51) is adopted as a binder, quartz sand, modified F-TiO nano particles and SiO nano particles are combined, and the quartz sand / F-TiO / SiO coated EP super-hydrophobic composite coating of a double-layer structure is prepared through a simple and convenient blade coating-spraying process. According to the coating, through multi-scale hierarchical structure design and low surface energy modification, a static water contact angle of 151 degrees and 1t are achieved; the rolling angle of 5 degrees shows excellent self-cleaning performance on liquid and solid pollutants. A mechanical stability test shows that in a Taber abrasion test, the coating still keeps good hydrophobicity after being abraded for 3000 cycles under the load of 250 g and abraded for 600 cycles under the load of 750 g; after 500 times of adhesive tape stripping experiments, the static water contact angle is still greater than 120 degrees, the rolling angle is as low as 5 degrees, and excellent wear resistance and substrate adhesion are shown.

This invention discloses an energy storage type TiO2 / CN X The photoanode of WO3 composite material and its preparation method include the following steps: preparing WO3 nanorods by hydrothermal method; adding WO3 nanorods and anionic surfactant to water, sonicating, adding pyrrole, stirring, and then adding an initiator solution dropwise under ice bath conditions, stirring, and obtaining WO3 / PPy composite after reaction; adding WO3 / PPy composite and anionic surfactant to an alcohol solution, sonicating and stirring, adding tetrabutyl titanate, glacial acetic acid and acetone, and then adding an aqueous alcohol solution dropwise, transferring to a hydrothermal reactor for reaction, obtaining precursor TiO2 / PPy / WO3 composite after hydrothermal reaction; loading the precursor TiO2 / PPy / WO3 composite onto a conductive substrate. TiO2 / CN X / WO3's excellent sustained photocathode protection performance can be attributed to the highly conductive CN X In synergy with WO3, a narrow-bandgap semiconductor with energy storage properties, TiO2 nanoparticles with stable photoelectrochemical properties serve as the main material, ensuring the stability of the photoelectric performance of ternary materials.

The application discloses a kind of photocatalytic performance composite materials, the composite material is schulte mineral-titanium dioxide supported biochar, the surface of the biochar is loaded with schulte mineral and titanium dioxide, and the schulte mineral is also connected titanium dioxide.The composite material obtained by the application has excellent structural effect, the surface of the biochar with wrinkle structure is uniformly covered with schulte mineral and TiO2, wherein the schulte mineral is also combined with TiO2 closely.The composite material of the application can effectively enhance the electron transfer efficiency of photoelectronic and hole, increase the catalytic efficiency of catalyst.The composite material of the application has the advantages of short processing time and large capacity of processing.The precursor material for material synthesis is derived from waste biomass resources, FeSO4·7H2O is widely available and low in price, and TiO2 nanoparticles is low in price, so the catalyst in the application has the advantages of low cost, easy popularization and easy operation.

The invention discloses a photochromic TiO2-PEG200 (Polyethylene Glycol 200) nano particle and an application of the photochromic TiO2-PEG200 nano particle in photocatalytic oxidation of a C-H bond. The catalyst is synthesized through a solvothermal method, PEG200 is used as a solvent and a modifier, and self-doped Ti < 3 + > and surface oxygen vacancies are introduced into TiO2. Under the irradiation of blue light (405nm), the catalyst generates a photochromic effect, Ti < 4 + > is reduced into high-concentration Ti < 3 + > in situ, and meanwhile, a large amount of superoxide free radicals (O < 2 + >) are generated. A photo-generated hole directly activates an ethylbenzene alpha-C-H bond to generate a benzyl free radical, and the benzyl free radical reacts with a superoxide free radical (O2.) and is finally converted into acetophenone. The catalyst has excellent visible light response and charge separation efficiency, and the acetophenone yield is up to 56 mmol.g <-1 >. H <-1 > and is 10 times that of traditional TiO2. The reversible circulation of Ti < 3 + > / Ti < 4 + > enables the catalyst to maintain good stability, and the activity is still maintained at 95% or above after five times of circulation. The operation conditions are mild (room temperature and normal pressure), a strong oxidant is not needed, an efficient, stable and environment-friendly photocatalysis solution is provided for C-H bond activation, and the method has important application value in the field of fine chemical synthesis.

This invention provides a method for preparing a superhydrophobic silk / ultrafine viscose high-softness fabric, comprising the following steps: S1. Degumming the silk / ultrafine viscose fabric to obtain a degummed silk / ultrafine viscose fabric; S2. Adding hydrophobic micron-sized flake-like aerogel powder to ethyl acetate solvent and stirring to mix evenly to obtain a hydrophobic finishing solution; S3. Applying the hydrophobic finishing solution prepared in S2 to the surface of the fabric after degumming in step S1 in one direction, and then drying the fabric, repeating the application in the same direction as the first application to obtain a silk / ultrafine viscose fabric with a surface covered with flake-like powder; S4. Adding PDMS and hydrophobic nano-TiO2 nanoparticles to a spinnable tetraethyl orthosilicate solution, mixing and stirring evenly, and aging to a spinnable viscosity, using the side of the fabric surface covered with flake-like powder as the receiving surface, and performing electrospinning to obtain a superhydrophobic silk / ultrafine viscose high-softness fabric.

A titanium dioxide (TiO2) composition and methods of use, the composition containing surface-modified doped TiO2 nanoparticles (sm-TiO2 NPs) disposed in a polymer matrix material, wherein each sm-TiO2 NP has an outer surface having a plurality of bifunctional linker molecules attached thereto and a plurality of protein molecules linked to the sm-TiO2 NP via the bifunctional linker molecules; and wherein the polymer matrix comprises a polymer precursor component.

The invention discloses a full-spectrum response type aerogel photocatalyst as well as a preparation method and application thereof. The full-spectrum response type aerogel photocatalyst has a multi-heterostructure, and the multi-heterostructure comprises an in-plane heterostructure of amorphous carbon, graphite carbon and a BCN ring and a TiO2 mixed crystal phase structure of anatase type TiO2 and rutile type TiO2. The catalyst can be applied to preparation of methanol through photo-thermal catalytic reduction of CO2 in any single wave band range or combined wave band range in ultraviolet light, visible light and near-infrared light; the preparation method of the full-spectrum response type aerogel photocatalyst comprises the following steps: a) preparation of reduced TiO2 nanoparticles; b) preparation of aerogel; and c) high-temperature carbonization. The aerogel photocatalyst not only can realize full-spectrum response, but also can realize in-situ generation and regulation of oxygen vacancies in photo-thermal catalysis, so that the efficiency of reducing CO2 to prepare methanol is improved.

The invention discloses a preparation method of a three-dimensional moisture transport fabric, specifically comprising the following steps: (1) first 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane is dissolved in ethanol, stirred, and then TiO2 nanoparticles are added, mixed, and a suspension is obtained; (2) cotton fabric is added to the suspension and soaked, taken out and cleaned, and aired to obtain a super-hydrophobic cotton fabric; (3) the outside of the super-hydrophobic cotton fabric is subjected to ultraviolet irradiation, and a wetting gradient is constructed in the outside length direction; (4) the inside of the super-hydrophobic cotton fabric is subjected to ultraviolet irradiation, and a wetting gradient is constructed in thickness direction. The present invention transports and manages moisture outside the fabric, which will be conducive to improving the comfort of the inside of the fabric, and avoids the fabric moisture management ability decline caused by water saturation outside the fabric.

The invention provides a UV-curable optical adhesive with high refractive index, high light transmittance and yellowing resistance and an optical film layer. The optical adhesive comprises the following components in percentage by weight: 20-90% of titanium dioxide nanoparticles; 5%-40% of an organic component; 0.1%-2% of a leveling agent; 0.1%-2% of a defoaming agent; 0.5% to 10% of an anti-ultraviolet agent; 0.5%-10% of an initiator; the cured and high-hardness organic components endow the high-refractive-index organic film with the characteristics of high hardness, wear resistance, water resistance and the like; the leveling agent is endowed with the characteristics of easiness in leveling during film forming, easiness in demolding during nanoimprint and the like; the defoaming agent can reduce bubble residues during film formation and prevent generation of shrinkage cavities; the anti-ultraviolet component can absorb low-wavelength ultraviolet light and convert the low-wavelength ultraviolet light into high-wavelength visible light, so that yellowing is slowed down; the initiator can link all the components into a net-shaped structure; the refractive index of the optical film layer prepared by using the formula is gt; in addition, the high-transmittance and anti-yellowing optical film has the characteristics of high light transmittance and yellowing resistance, and can be well applied to the fields of optical coatings, nanoimprint and the like.

The invention discloses a preparation method of a high-temperature-resistant antibacterial polyethylene composite plastic, which comprises the following steps: S1, by taking alkyl imidazole and M-dicarbon closed dodecaborane-1, 7-dicarboxylic acid as double ligands, carrying out thermal self-assembly on the double ligands and a metal salt solvent to obtain MOF (Metal Organic Framework); s2, dispersing the TiO2 / double-ligand MOF in an ammonium fluotitanate solution, adding a surfactant and inorganic weak acid, and performing in-situ deposition on TiO2 nanoparticles to prepare a TiO2 / double-ligand MOF compound; s3, carrying out melt extrusion granulation on the antibacterial master batch, polyethylene resin and an auxiliary agent to form antibacterial master batch; and S4, enriching the master batch on the surface layer by adopting a multi-layer co-extrusion process, keeping pure PE on the core layer, and cooling to obtain a finished product. According to the preparation method disclosed by the invention, the polyethylene composite material is endowed with excellent heat resistance and antibacterial durability, and the material has good anti-ultraviolet, self-cleaning, flame-retardant and smoke-suppressing properties, and is suitable for the fields with strict requirements on high-performance environment-friendly antibacterial plastics, such as food packaging, medical equipment, household appliance shells and the like.

The invention provides photocatalyst nanoparticles for air sterilization and a preparation method of the photocatalyst nanoparticles. The preparation method of the photocatalyst nano-particles for air sterilization comprises the steps of preparing nitrogen-doped titanium dioxide precursor sol, preparing nitrogen-doped titanium dioxide nano-particles, preparing a second mixed system and preparing Ag / Cu bimetallic loaded nitrogen-doped titanium dioxide nano-particles. According to the preparation method, the nitrogen doping amount, the calcining temperature and the heat preservation time are synergistically optimized, so that the obtained nitrogen-doped TiO2 nanoparticles have relatively high crystallinity and relatively large specific surface area while keeping stable existence of an anatase phase, thereby improving the separation efficiency of photo-induced electron-hole pairs and the number of surface active sites; under the irradiation of visible light, more hydroxyl free radicals, superoxide anion free radicals and peroxides can be generated, and bacteria, viruses and volatile organic compounds in the air can be efficiently oxidized, decomposed and inactivated. The invention also provides an air filtration nanofiber membrane.

The invention provides a titanium dioxide-copper core-shell catalyst, a preparation method and application of the catalyst in methanol synthesis, and the preparation method comprises the following steps: dispersing TiO2 nanoparticles in deionized water, adding a copper salt solution and a reducing agent into an obtained dispersion system, reducing Cu < 2 + > in the dispersion system into Cu nanoparticles in a protective atmosphere at the temperature of 40-60 DEG C, and carrying out vacuum drying to obtain the titanium dioxide-copper core-shell catalyst. Depositing on the outer surfaces of the TiO2 nanoparticles, and drying to obtain a catalyst precursor; and calcining the catalyst precursor at the temperature of 300-450 DEG C for 1-4 hours to form the titanium dioxide-copper core-shell catalyst. The TiO2 core in the catalyst can effectively isolate and stabilize the Cu nanoparticles, improve the anti-sintering ability of the Cu nanoparticles, reduce the side reaction of carbon deposition and prolong the service life of the catalyst. Under the illumination condition, photo-induced electrons of TiO2 and the plasma effect of Cu have a synergistic effect, the reaction temperature can be reduced, the methanol yield can be increased, and efficient photo-thermal synergistic catalysis is achieved.

According to the application of the difunctional microcapsule in formaldehyde degradation, the difunctional microcapsule is of a core-shell structure, the core is a phase change material, and the shell is a polymer layer containing TiO2 nanoparticles. According to the technical scheme, the photo-generated carrier separation efficiency can be remarkably improved, the durability is enhanced, meanwhile, the inner core part of the microcapsule can further play an energy storage or heat management function, and the dual-function cooperation of photocatalysis and energy regulation and control is achieved.

The application relates to the field of slow-release fertilizers, and particularly discloses a nano-selenium drought-resistant and high-temperature-resistant slow-release fertilizer and a preparation method thereof. 0 The method comprises the following steps: fixing glucose oxidase on the surface of TiO2 nanoparticles, and performing cascade reaction of the glucose oxidase, glucose and sodium selenite under mild conditions to realize synchronous synthesis of Se The method is green, mild and controllable, the obtained selenium fertilizer has excellent stability and slow-release performance, can significantly improve the selenium content and yield of crops, and is suitable for selenium-rich functional agriculture.

The invention discloses a method for synthesizing rutile type TiO2 nanorods by a molten salt method, and belongs to the technical field of material synthesis. The invention provides a method for synthesizing rutile type TiO2 nanorods by a molten salt method, which comprises the following steps: by taking anatase TiO2 nanoparticles as an initial raw material and KCl and K2CO3 as molten salts, carrying out dry grinding and mixing, and then calcining to obtain the rutile type TiO2 nanorods with uniform morphology and high length-diameter ratio, and the purity of the rutile phase exceeds 92%. The method is easy to operate, only simple ball milling is needed, no solvent or complex reaction equipment needs to be introduced, the synthesis time is only several hours, and the rutile TiO2 nanorod is efficiently synthesized in a short time.

This invention relates to the field of plastic composite materials technology, and discloses an aging-resistant plastic composite material and its preparation method, specifically including: synthesizing an aging-resistant silane coupling agent and an aldehyde-modified aging-resistant silane coupling agent; based on the silanol-hydroxyl condensation reaction mechanism, jointly modifying the aging-resistant silane coupling agent and the aldehyde-modified aging-resistant silane coupling agent onto the surface of rutile TiO2 nanoparticles; then, based on the aldehyde-amino Schiff base reaction mechanism, combining the TiO2 nanoparticles with aldehyde functional groups on the surface with amino-functionalized kaolin to obtain an aging-resistant modifier; based on the π-π stacking effect, combining the aging-resistant modifier with SBR rubber, and obtaining aging-resistant SBR rubber particles through a crushing process; and compounding the aging-resistant SBR rubber particles with a polyurethane adhesive to obtain an aging-resistant plastic composite material, which exhibits excellent resistance to photo-oxidative aging and thermo-oxidative aging.

The invention belongs to the technical field of silicone rubber, and particularly relates to Fe-doped TiO2 modified silicone rubber as well as a preparation method and application thereof. According to the Fe-doped TiO2 modified silicone rubber provided by the invention, Fe-TiO2 nanoparticles are prepared by using a flame spray pyrolysis method, the silicone rubber is modified, the Fe-TiO2 nanoparticles can be uniformly dispersed in the silicone rubber, and through dual effects of maintaining completeness of a main chain of the silicone rubber and reducing an excessive cross-linking reaction between silicon chains and oxygen chains in a high-temperature environment, the silicon rubber can be effectively modified, so that the silicon rubber can be effectively modified, and the service life of the silicon rubber is prolonged. The thermal aging resistance of the silicone rubber is remarkably improved, and the technical problem that high-performance thermal aging resistant silicone rubber is lacked in the prior art is solved.

The application relates to a Janus PVDF hollow fiber ultrafiltration membrane and a preparation method thereof, the Janus PVDF hollow fiber ultrafiltration membrane comprising a PVDF hollow fiber ultrafiltration base film and Janus particles; the PVDF hollow fiber ultrafiltration base film is prepared by hydrophilic modification of a polyester fiber hollow braided tube and a PVDF polymer casting solution; one side of the Janus particles is TiO2-PVDF, and the other side is modified epoxy resin; the TiO2-PVDF is prepared from a first spinning solution, and the first spinning solution comprises TiO2 nanoparticles and PVDF; the modified epoxy resin is prepared from a second spinning solution, and the second spinning solution comprises epoxy resin, an epoxy-containing silane coupling agent and an amine curing agent. The Janus PVDF hollow fiber ultrafiltration membrane has the advantages that the Janus particle TiO2-PVDF side plays a role in improving the hydrophilicity and antibacterial property of the membrane, the modified epoxy resin side mainly plays a bonding role, the hydrophilicity of the membrane is further improved, and the problem of material loss caused by poor compatibility is overcome.

The present invention provides a preparation method and application of a modified white clay adsorbent for deolefination / decolorization, including: mixing tetrabutyl titanate with anhydrous ethanol to obtain a precursor solution; mixing anhydrous ethanol, glacial acetic acid and deionized water to obtain a composite solvent, dispersing the modified white clay in the composite solvent to obtain a white clay dispersion; under stirring, dropping the precursor solution into the white clay dispersion, mixing uniformly to obtain a mixed sol, and performing static aging, heating and drying, and high-temperature roasting on the mixed sol to obtain a modified white clay adsorbent. The present invention is treated with acid activation and modified by intercalation of quaternized carboxymethyl chitosan, and a sol-gel method is used to fix catalytically active titanium dioxide nanoparticles between the interlayers of the modified white clay, thereby further improving the adsorption effect of the modified white clay adsorbent on olefins and organic dyes.

The present invention relates to a low-odor recycled polypropylene composite material, its preparation method, and application. The composite material comprises 60-80 parts of polypropylene resin; 5-10 parts of a toughening agent; 20-30 parts of a filler; 0.2-0.5 parts of an antioxidant; 0.2-0.5 parts of a lubricant; 0.2-3 parts of a compatibilizer; and 0.3-1.5 parts of an odor suppressant. The odor suppressant is a compound of a metal oxidizing framework (MOF) material and TiO2 nanoparticles. The MOFs material prepared by the present invention not only has high porosity, high specific surface area, and a micro-mesoporous structure, but is also rich in conjugated benzene ring structures and oxygen-containing functional groups. It can absorb volatile odorous substances generated by recycled polypropylene during melt extrusion. Combined with the photocatalytic effect of TiO2, it further effectively decomposes organic molecules emitted by the material system, achieving a significant improvement in odor through synergistic effects. The MOFs material can be applied to automotive interior and exterior trims, effectively promoting the recycling of waste polypropylene.