1022results about How to "Improve thermal stability" patented technology

The invention provides an acetylacetone-based composite thermal stabilizer which is a mixture obtained by mixing zinc acetylacetonate, calcium acetylacetonate or magnesium acetylacetonate and hydrotalcite pro rata. The composite thermal stabilizer is suitable for chloride-containing high polymer, such as polyvinyl chloride, chlorinated polyethylene, chlorinated polyvinyl chloride, copolymer of vinyl chloride-ethylene or copolymer of vinyl chloride-vinyl acetate, has better thermal stability, prolongs the thermal aging time of the chloride-containing high polymer, and overcomes the shortcomings of poor long-term performance of single stabilizer of zinc acetylacetonate, poor transparency of stabilizer of calcium acetylacetonate, and poor initial colorability of stabilizer of hydrotalcite. The composite thermal stabilizer has low cost, good initial colorability, excellent long-term performance and good transparency, and is an efficient composite thermal stabilizer.

The invention relates to a fiber-reinforced aerogel composite material containing a carbon and titanium dioxide biphase hybrid opacifying agent as well as a preparation method and application of the fiber-reinforced aerogel composite material. The fiber reinforced aerogel composite material containing the carbon and titanium dioxide dual-phase hybrid opacifying agent comprises an inorganic aerogel matrix, wherein a reinforced fiber skeleton and the carbon / titanium dioxide dual-phase hybrid opacifying agent are dispersed in the inorganic aerogel matrix; the carbon / titanium dioxide biphase hybrid opacifying agent comprises a titanium dioxide shell layer and carbon / titanium dioxide core-shell structure particles, wherein the surface of a reinforced fiber skeleton is coated with the titanium dioxide shell layer in situ; gaps of the reinforced fiber skeleton are filled with the carbon / titanium dioxide core-shell structure particles. The problem to be solved is to construct a two-phase hybrid shading system in which carbon / titanium dioxide core-shell particles and a titanium dioxide coating layer on the fiber surface are combined through one-step in-situ synthesis, so that the heat insulation capacity of the composite material in a high-temperature environment is synergistically improved.

The invention provides a precise and small broadband hyperspectral imager, which is used for solving the technical problem that the existing broadband spectral imager from visible near-infrared to short-wave infrared for sceneries cannot meet the increasingly harsh imaging requirements. According to the small broadband hyperspectral imager, the front optical assembly of an off-axis two-reflection structure and the spectrometer assembly in a free-form surface reflector, optical path multiplexing and axis folding mode are adopted, the number of used lenses is greatly reduced, meanwhile, the length of a spectrometer is effectively reduced, and the imaging precision is improved. The volume and the weight of the spectral imager are greatly reduced; besides, front surfaces and rear surfaces of a first lens and a second lens in the spectrometer assembly are plated with broadband antireflection films from visible near-infrared to short-wave infrared according to light angles, and broadband detection from visible near-infrared to short-wave infrared can be realized in combination with a broadband refrigeration type detector. And the complexity and the installation and adjustment difficulty of the detector assembly and the circuit assembly are greatly reduced.

This invention discloses a copper-based ternary chalcogenide semiconductor material, its preparation method, and its applications. The material is prepared by mixing CuSn(OH)6 nanomaterials, thioacetamide, ethylenediaminetetraacetic acid, and water and carrying out a hydrothermal reaction to obtain Cu3SnS4 nanomaterials. This semiconductor material exhibits excellent photoelectrochemical properties. Photoelectrochemical sensors constructed based on this material demonstrate high detection accuracy, fast response speed, low detection limit, and strong stability, enabling rapid and accurate real-time detection of microplastic content. The preparation method is simple, low-cost, and suitable for industrial production.

The invention discloses ternary copolymerized low-dielectric polyimide based on fluorinated cross-linked side groups as well as a preparation method and application of the ternary copolymerized low-dielectric polyimide. According to the preparation method, two diamine monomers with a fluorine-containing group and a large-volume side chain group, namely fluorine-containing triarylmethane diamine and tetrafluorostyrene side group-containing diamine, are polymerized with 4, 4 '-(hexafluoroisopropenyl) diphthalic anhydride to obtain the ternary copolymerized polyimide (Co-FPAPI-x), and the preparation method is efficient, simple, convenient and low in cost. The tetrafluorostyrene group in the ternary copolymerized polyimide structure can form a hydrophobic cross-linked network through a thermal cross-linking reaction. Besides, by changing the proportion and thermal crosslinking degree of the two diamine monomers, the accumulation state, polarization behavior and the like of a molecular chain can be adjusted, so that the performance of the material is improved.

A heat-resistant insulated PVC material for communication cables comprises the following components and parts by weight: polyvinyl chloride 45-55; stabilizer 5-10; plasticizer 15-25; nitrile oxide 3-8; aluminum hydroxide 10-15; magnesium hydroxide 20-30; smoke suppressant 1-5; skin coupling agent 1-3; IPPP 10-20. The product obtained by this invention is lightweight, has good physical and mechanical properties, excellent mechanical balance, superior flame retardancy, good thermal stability, and no dripping.

The invention belongs to the technical field of synthesis of 2, 3-dipicolinic acid, and relates to a catalyst for synthesizing 2, 3-dipicolinic acid as well as a preparation method and application thereof, the catalyst is prepared from a carrier, and active components and auxiliaries loaded on the carrier; the carrier is boron nitride modified aluminum oxide, the active component is palladium-cobalt bimetal, and the auxiliary agent is magnesium; the catalyst comprises the following components in percentage by mass: 0.2 wt%-3wt% of palladium, 0.5 wt%-4wt% of cobalt, 0.05 wt%-0.3 wt% of magnesium, 5wt%-15wt% of boron nitride and the balance of an aluminum oxide carrier. The catalyst is prepared by adopting an ultrasonic-assisted sol-gel method, so that high dispersion and strong interaction of active components are realized. The catalyst shows high catalytic activity, high selectivity and excellent stability in a dichloropyridine carbonylation reaction, carbon monoxide is used as a carbonyl source, the atom economy is high, and the green chemical requirement is met.

This invention relates to the field of polymer technology, specifically disclosing an oxyfluorene-containing polyaryl suspended side-chain anion exchange polymer. By introducing an oxyfluorene structure, this invention successfully overcomes the defects of traditional polyaryl ether materials, such as easy main chain breakage and degradation under strong alkaline conditions, thus improving the chemical and thermal stability of the material. The suspension side-chain strategy introduces benzene rings, quaternary ammonium groups, or piperidine cationic groups, effectively promoting microphase separation within the polymer and constructing efficient ion transport channels. This allows the membrane material to maintain a low swelling ratio while achieving good hydroxide ion conductivity, reaching up to 170.2 mS / cm at 80°C. The polymer exhibits excellent mechanical properties, with outstanding dry membrane tensile strength and excellent alkali resistance and durability. After immersion in a strong alkaline (KOH) solution at 80°C for over 1800 hours, its conductivity loss is minimal. The anion exchange membrane prepared by this invention has good application value in fuel cells and water electrolysis for hydrogen production, demonstrating strong commercial potential.

The invention provides a nitrogen-doped hierarchical pore carbon material as well as a preparation method and application thereof, and the preparation method comprises the following steps: sequentially dissolving urea, alkali metal hydroxide and / or a pore-forming agent in water to obtain a mixed solution, cooling the mixed solution, adding cellulose-based biomass, and dissolving the cellulose-based biomass to obtain transparent sol; freezing the transparent sol into a solid, and performing vacuum freeze drying to obtain a white loose solid; mixing and grinding the liquid polymeric monomer and the white loose solid, and performing heat treatment to obtain a solid product; and carbonizing the solid product in an inert atmosphere, and then pickling and washing the carbonized product. According to the preparation method, chain-shaped arrangement in cellulose-based biomass molecules is converted into three-dimensional net-shaped arrangement through dissolution, macropores are formed, a macropore framework is kept stable and does not collapse in the carbonization process through polymerization reaction, and the formed hierarchical pore carbon material has a micropore / mesopore / macropore coexisting three-dimensional structure and controllable specific surface area and pore size distribution; meanwhile, in-situ nitrogen doping can also be realized.

The present application relates to a strain of Inhernia Bacillus and its application in ramie degumming, the strain is preserved in Guangdong Microbial Culture Collection Center on September 15, 2025, and the preservation number is GDMCC NO: 66966. When the strain is applied to ramie degumming, the degumming reaction can be carried out at a higher temperature, the degumming efficiency of ramie is effectively improved, the fiber is not damaged, the quality of the fiber is improved, and the strain has high application value in ramie degumming.

The present application relates to a kind of catalyst for hydrogen chloride oxidation preparation chlorine and its preparation method and application.The preparation method includes: after carrier substrate, metal tantalum powder, binder solution are mixed, extrusion forming is obtained green body, the green body is prepared composite carrier by calcination, the mass fraction of metal tantalum powder in the composite carrier is 5%-30%;Inorganic salt containing catalytically active element is made into solution and is placed in the composite carrier, and after drying, pre-product is obtained, and the pre-product is prepared catalyst by calcination.The preparation method described in the present application prepares high thermal conductivity composite carrier, not only effectively improves the heat conduction efficiency of catalyst, guarantees the effective activity of catalyst, but also guarantees the stability of composite carrier, thereby effectively prolongs the life of catalyst.

This invention belongs to the field of sodium-ion batteries, and relates to a fluorophenylphosphonate, its preparation method, and its application in sodium-ion batteries. The fluorophenylphosphonate includes di(trifluoroisopropyl)phenylphosphonate or di(hexafluoroisopropyl)phenylphosphonate; the preparation steps are as follows: using fluoroalcohol and phenylphosphonyl dichloride as raw materials, triethylamine as an acid-binding agent, and diethyl ether as a reaction solvent, the fluorophenylphosphonate is prepared by a condensation substitution reaction. Sodium-ion batteries prepared using fluorophenylphosphonate exhibit high ionic conductivity and an electrochemical stability window. This phosphonate additive preferentially decomposes at the electrode interface, inducing the formation of a thin, dense, uniform electrode-electrolyte interface phase rich in NaF inorganic components, and giving the electrolyte excellent flame-retardant properties. Sodium-ion batteries assembled with positive electrode materials exhibit good rate performance and cycle stability, with a cycle life exceeding 5000 cycles at room temperature. Simultaneously, this electrolyte also exhibits excellent cycle performance at a high temperature of 60°C.

The application discloses a Sinonovacula constricta glycoprotein nano-enzyme Sc-NZ and a preparation method thereof, and particularly relates to the technical field of nano-enzymes. The Sinonovacula constricta glycoprotein nano-enzyme Sc-NZ is a cluster-shaped nanoparticle obtained by treating a product separated and purified from Sinonovacula constricta under ultrahigh pressure, and the particle size distribution is 30-50 nm. The preparation method comprises the following steps: taking soft body tissue of Sinonovacula constricta, homogenizing and defatting, centrifuging to collect the precipitate to obtain defatted powder, extracting the defatted powder by an alkali extraction and alcohol precipitation method, adjusting the pH to 4.0-5.0, collecting and drying the precipitate to obtain a crude glycoprotein; subjecting the crude glycoprotein to enzymolysis, and then sequentially subjecting the glycoprotein to anion exchange chromatography and gel filtration chromatography to collect an active component to obtain a Sinonovacula constricta natural glycoprotein; adding deionized water or a phosphate buffer to the Sinonovacula constricta natural glycoprotein to prepare a solution, and placing the solution in an ultrahigh pressure device to obtain the Sinonovacula constricta glycoprotein nano-enzyme Sc-NZ. The Sinonovacula constricta glycoprotein nano-enzyme Sc-NZ has the advantages of being prepared by green physical modification, high activity, high stability and multifunction.

This invention relates to an air electrode material and its preparation method. The preparation method includes: using metal salts of Ce, Pr, La, Ba, and Sr, metal salts of Co, and a fluorine source as raw materials, and preparing a fluorine-containing perovskite precursor according to a stoichiometric ratio; pretreating the precursor and then sintering it to obtain a composite powder; the composite powder includes a fluorine-containing perovskite main phase and a fluorine-containing CeO2 nanophase; pulverizing and sieving the composite powder to obtain air electrode powder; the fluorine-containing perovskite main phase is an A-site high-entropy perovskite oxide; the fluorine-containing CeO2 nanophase is precipitated through the self-assembly of some Ce elements during sintering; the fluorine-containing CeO2 nanophase is dispersed inside the main phase grains or at grain boundaries, and forms a strongly coupled heterogeneous interface with the main phase. This invention solves the technical problems of poor surface exchange activity, bulk diffusion transport, and long-term stability of existing air electrodes.

The application belongs to the technical field of bioengineering, and particularly relates to a xanthan gum cleavage ancestral enzyme AncXLY196 based on ancestral sequence reconstruction, an amino acid sequence of which is shown as SEQ ID NO. 2. Based on the xanthan gum cleavage ancestral enzyme, a mutant AncXLY196-X7 is further obtained, an amino acid sequence of which is shown as SEQ ID NO. 4, xanthan gum degradation activity of which reaches 2.5 times of that of the xanthan gum cleavage ancestral enzyme, and the optimal catalytic temperature of the xanthan gum cleavage ancestral enzyme and the mutant thereof is increased to 45 DEG C, and the enzyme activity of the mutant of the xanthan gum cleavage ancestral enzyme is reserved by 50-80% after being treated at 45-55 DEG C for 12-24 h. The application provides a new enzyme resource for efficient enzymatic degradation of xanthan gum and preparation of functional oligosaccharides.

This invention relates to the field of polymer materials, specifically to an automotive interior material and its preparation method, comprising PVC resin and a composite heat stabilizer; the composite heat stabilizer comprises a calcium-zinc heat stabilizer, a polyol phosphate ester, and amino POSS, wherein the mass ratio of the PVC resin to the composite heat stabilizer is 20-40:1, and the mass ratio of the calcium-zinc heat stabilizer, the polyol phosphate ester, and the amino POSS is 1-5:1-5:1-5. The automotive interior material prepared by this invention has good thermal stability and mechanical properties, and excellent heat aging resistance.

The present application belongs to the technical field of high-performance nylon fiber materials, and particularly relates to a preparation method of antibacterial modified high-performance nylon fiber. The preparation method comprises the following steps: S1, a triazine ring-containing dicarboxylic acid is prepared by taking cyanuric chloride, 4-amino-2,2,6,6-tetramethylpiperidine and p-hydroxybenzoic acid as raw materials, triphenylphosphine oxide is subjected to nitration treatment and reduction treatment to obtain tris(3-aminophenyl)phosphine oxide, and the triazine ring-containing dicarboxylic acid and the tris(3-aminophenyl)phosphine oxide are mixed for a synthesis reaction to obtain modified hyperbranched polyamide; S2, polyamide masterbatch, modified hyperbranched polyamide, antibacterial material, zinc stearate and antioxidant are melt blended, extruded and granulated to obtain modified nylon chip; and S3, the modified nylon chip is subjected to melt spinning to obtain antibacterial modified high-performance nylon fiber. The present application not only ensures that the fiber has good antibacterial performance, but also effectively improves the breaking strength and flame retardant performance.

The invention relates to the technical field of anion exchange membrane fuel cells, in particular to a cation remote grafting type polycarbazole anion exchange membrane and a preparation method thereof. The membrane is prepared by the following steps: condensing N-(4-bromobutyl) carbazole, N-alkyl carbazole and 2, 3-butanedione to obtain a polymer skeleton, then carrying out Menshutkin reaction on the polymer skeleton and cations to obtain polyelectrolyte, and finally carrying out ion exchange on the polyelectrolyte and sodium hydroxide. Wherein the main chain of the polymer has no unstable ether bond, so that the membrane has strong alkali resistance. The flexible overhanging side chain improves dimensional stability and increases polarity differences. Cations are grafted away from a framework, the alkali resistance of the membrane is improved, the service life is prolonged, hydrophilic / hydrophobic microphase separation is enhanced, an ion transmission channel is formed, and the ion conductivity is high. The membrane has good mechanical strength and flexibility, the tensile strength reaches 55.34 MPa, the elongation at break reaches 22.49%, the application requirements of fuel cells are met, and the membrane has excellent thermal stability and wide application prospects in alkaline anion exchange membrane fuel cells.

The application belongs to the field of new materials, and discloses a lead-free perovskite X-ray shielding composite material and a preparation method and application thereof, and comprises the following steps: mixing ANF / DMSO dispersion liquid with ethanol to obtain re-protonated ANF dispersion liquid; mixing the re-protonated ANF dispersion liquid, CsI powder and ethanol, and stirring to obtain two portions of the same CsI / ANF dispersion liquid; mixing re-protonated ANF, Cs3Bi2I9 powder and ethanol, and stirring to obtain Cs3Bi2I9 / ANF dispersion liquid; sequentially filtering the first portion of CsI / ANF dispersion liquid, the Cs3Bi2I9 / ANF dispersion liquid and the second portion of CsI / ANF dispersion liquid by using a gel-gel method, and vacuum hot-pressing to obtain a composite gradient film with a biomimetic symmetrical structure, which is used as a lead-free perovskite X-ray shielding composite material; and the application realizes continuous and efficient X-ray shielding effect, and can improve the mechanical flexibility and thermal stability of the material.

The application discloses an electrode material based on MOF@COF / BC and application thereof in wastewater treatment and belongs to the technical field of wastewater treatment. The electrode material is prepared by the following method: NH2-MIL101(Fe), melamine and phthalocyanine molybdenum are dissolved in dimethyl sulfoxide, reaction is carried out at 160-200 DEG C for 10-14 h, the precipitate is collected after reaction, and washing, drying are carried out to prepare NH2-MIL101(Fe)@Mel-MoPc; the biochar and NH2-MIL101(Fe)@Mel-MoPc are mixed in deionized water, ultrasonic treatment is carried out for 8-12 min, stirring is carried out for 10-14 h, then the precipitate is collected by centrifugation, and washing, drying are carried out to prepare the electrode material. The application develops and designs a novel electrode material, which is used for electrocatalytic activation of peroxymonosulfate to degrade OFX wastewater, and the degradation efficiency of the OFX wastewater is greatly improved.

The invention relates to the technical field of high-performance polymer materials, in particular to low-dielectric and high-temperature-resistant modified cyanate ester resin and a preparation method thereof. Advantages and characteristics of bisphenol A type cyanate ester monomers and bisphenol M type cyanate ester monomers are combined, and the dielectric property and the thermal stability are remarkably improved. Diallyl bisphenol A is introduced as a network structure modifier, the phenolic hydroxyl group of the diallyl bisphenol A adjusts the curing reaction rate, and the allyl and bisphenol A structures of the diallyl bisphenol A finely regulate and control the rigid-flexible balance of a cross-linked network through chemical copolymerization, so that the curing process is controllable and the final network structure is optimized. Meanwhile, a toughening system is innovatively designed, epoxy-terminated liquid nitrile rubber is adopted for toughening, stable micron-scale rubber particles are formed in a resin matrix in a chemical bonding mode, and the fracture toughness is improved. The modified resin has excellent dielectric properties, high heat resistance and a wide process window, and meets the strict requirements of a new generation of low observability aircrafts on a bearing-stealth integrated composite material matrix.

The invention provides a lithium-rich manganese-based positive electrode material, a preparation method thereof and a lithium ion battery containing the lithium-rich manganese-based positive electrode material, and belongs to the field of lithium ion batteries. The chemical formula of the lithium-rich manganese-based positive electrode material is xLi < 2 > MnO < 3 >. (1-x) LiTMO2, 0 lt, xlt; 1, TM is selected from Ni, Co and Mn; the lithium-rich manganese-based positive electrode material comprises a monoclinic Li2MnO3 phase and a rhombic LiTMO2 phase, the content of the monoclinic Li2MnO3 phase is sequentially reduced from inside to outside, the content of the rhombic LiTMO2 phase is sequentially increased from inside to outside, and a spinel phase layer is arranged on the surface of the lithium-rich manganese-based positive electrode material. The lithium-rich manganese-based positive electrode material prepared by the method has the advantages of high thermal stability, high compactness and high cycle performance.

This utility model discloses a screw nut internal thread grinding machine, comprising: a bed, a fixed worktable on the front side of the bed, a headstock fixedly mounted on the left side of the worktable, and a movable center support on the right side of the worktable; a chuck for clamping the workpiece is mounted at one end of the headstock; a movable dual-axis worktable is mounted on the rear side of the bed, a movable grinding wheel head is mounted on one side of the dual-axis worktable, and a grinding wheel dresser is mounted on the other side; a retractable and rotatable grinding wheel grinding device is mounted at the front end of the grinding wheel head, and a grinding wheel drive device is connected to the grinding wheel grinding device. The bed of this utility model adopts a rectangular structure and is a grinding wheel head movable structure, which, compared with the traditional T-shaped structure machine tool with a movable worktable, has advantages such as high structural rigidity, fast dynamic response speed, good thermal stability, high machining accuracy, and small footprint.

The application belongs to the technical field of putty, and particularly relates to a high-temperature-resistant CHPO curing putty with good polishing performance and a preparation method thereof. The high-temperature-resistant CHPO curing putty with good polishing performance comprises an A component and a B component. The A component comprises the following raw materials in parts by weight: linseed oil modified unsaturated polyester resin 140-160 parts, oleic acid modified air-drying unsaturated polyester resin 40-60 parts, dicyclopentadiene modified unsaturated polyester resin 90-110 parts, styrene 30-40 parts, drier 5-8 parts, accelerator 0.1-1.2 parts, dispersant 3-5 parts, thixotropic agent 8-12 parts, titanium white powder 12-16 parts, talc powder 400-500 parts, and pre-expanded polymer microspheres 5-10 parts. The application effectively solves the problems of poor polishing performance, poor adhesion to water-based epoxy primer and poor high-temperature resistance of traditional CHPO curing putty.

The application provides a recyclable phase change microcapsule and a preparation method thereof, and comprises the following steps: (1) preparing a surfactant solution; (2) adding a phase change material into the surfactant solution and uniformly dispersing to obtain an emulsified solution; (3) adding a solution containing magnetic metal ions into the emulsified solution and uniformly stirring to obtain a mixed solution; (4) adding a solution containing carbonate or hydroxyl into the mixed solution, so that the carbonate or hydroxyl reacts with the magnetic metal ions to form a coating wall material of the capsule; (5) performing cooling treatment on the solution in the stirring state in (4) until the microcapsule is coagulated into a small spherical shape, and then the recyclable phase change microcapsule is obtained after separation, washing and drying. The application can realize the repeated use of the microcapsule, and the capsule wall of the microcapsule is all inorganic material with magnetism, which has high flame retardance, mechanical strength and thermal conductivity, so that the microcapsule can be better used in the field of building energy-saving materials.

The invention relates to the technical field of lithium ion batteries, in particular to a composite positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment. The invention provides a preparation method of a composite positive electrode material, which comprises the following steps: mixing a bulk phase dopant, a lithium source and a ternary precursor to obtain a mixture I, and respectively sintering at 815-830 DEG C for 12-14 hours and at 760-770 DEG C for 8-10 hours to obtain a sintered material I-1 and a sintered material I-2; a first coating agent and a second coating agent are mixed with the sintered material I-1 and the sintered material I-2 respectively and then coated, and a sintered material II-1 and a sintered material II-2 are obtained; and mixing the sintered material II-1 and the sintered material II-2 to obtain the composite positive electrode material. According to the invention, the bulk phase dopant and the doped ternary precursor core layer are firstly added, then the first coating agent and the second coating agent are added, and the surface functional layer is synthesized, so that the composite positive electrode material has both high capacity and high cycle stability under the synergistic effect of the bulk phase dopant and the doped ternary precursor core layer.

This invention relates to the field of metallic materials and hot working technology. The invention discloses a high-temperature resistant, low-activation steel and its preparation method. The chemical composition of the raw materials is as follows (by mass percentage): Cr: 8.0–10.0%, W: 1.0–2.0%, V: 0.2–0.5%, Ta: 0.05–0.2%, Y: 0.005–0.02%, Ce: 0.001–0.005%, B: 0.001–0.005%, C: 0.08–0.16%, N: 0.015–0.035%, Mn: 0.3–0.8%, with the balance being Fe. The steel matrix is ​​tempered martensite, with the original austenite grains having an equivalent size of less than 10 μm, and containing dispersed MX-type carbides (nitrides) and M... 23 C6 type carbides. The preparation process involves vacuum induction melting, homogenization and forging, multi-cycle thermomechanical treatment (TMT), and tempering. This significantly refines the austenite grains and martensite substructure, thereby enhancing the synergistic effect of strength and toughness. The material achieves excellent tensile strength at 650 °C while maintaining an impact absorption energy greater than 150 J at room temperature and -20 °C, making it suitable for use in nuclear fusion reactor core structural materials.

The application discloses a kind of synthesis of high-temperature pressure-resistant thermosetting resin plugging material and water-based drilling fluid, and relates to the field of oil and gas field drilling fluid technical treatment agent.The material is prepared from aromatic compound containing double bond and methoxy, aromatic compound containing carbonyl, epichlorohydrin, sodium dodecyl mercaptan and m-chloro-peroxybenzoic acid.Among them, the molar ratio of sodium dodecyl mercaptan and aromatic compound containing double bond and methoxy is 1:1-1:2, the molar ratio of epichlorohydrin and double bond-containing phenolic compound is 1.2:1-1.5:1, the molar ratio of two double bond compounds and m-chloro-peroxybenzoic acid is 1:2.0-1:2.4, and the molar ratio of aromatic compound containing carbonyl, formamide and formic acid is 1:2:1.5-1:5:3.Specifically, the temperature resistance of the resin plugging material is 363℃, and the uniaxial compressive strength can reach 160MPa.The application is suitable for plugging high-temperature and high-pressure formation loss during oil and gas drilling process, and has broad application prospect.

The invention discloses a beta 1, 3-galactosyl transferase Pm beta 3GalT-S207H and an application thereof, and belongs to the technical field of functional enzymes. And the amino acid sequence of the beta 1, 3-galactosyl transferase Pm beta 3GalT-S207H is as shown in SEQ ID NO. 3. The invention further discloses the application of the beta 1, 3-galactosyl transferase Pm beta 3GalT-S207H in the preparation of lactose-N-tetrasaccharide. According to the invention, 1, 3-galactosyl transferase Pm beta 3GalT is subjected to mutation modification to obtain a mutant enzyme, and compared with a wild enzyme, the enzyme activity of the mutant enzyme is improved by 157.21% and is obviously improved, and the thermal stability and alkali resistance are also obviously improved. The beta 1, 3-galactosyl transferase Pm beta 3GalT-S207H disclosed by the invention has important theoretical value and application value on the industrial production of LNT (Lipoxystrobin).

The application provides a triarylamine derivative and an organic electroluminescent device thereof, and particularly relates to the technical field of organic electroluminescence. In order to solve the problem of low device performance caused by the covering layer material in the prior art, the application provides a triarylamine derivative and an organic electroluminescent device thereof, which is applied to an organic electroluminescent device as a covering layer material to effectively improve the luminous efficiency and service life of the device. Since the triarylamine derivative has strong rigidity, a suitable glass transition temperature (Tg), good thermal stability and a high refractive index in the molecule, the coupling efficiency of light in the device is increased, the light extraction efficiency is improved, the generation of Joule heat is reduced, and the service performance of the device is improved.