118 results about "Phthalic anhydride" patented technology

The invention relates to the technical field of sound insulation materials, in particular to flame-retardant epoxy resin composite diatomite sound insulation cotton and a preparation method thereof. The flame-retardant epoxy resin composite diatomite sound insulation cotton is prepared from epoxy resin, diatomite, a composite flame retardant, a coupling agent, a curing agent, a diluent, a foaming agent and a charring agent. The composite flame retardant at least comprises ammonium polyphosphate and melamine; the coupling agent is a silane coupling agent or a titanate coupling agent; the curing agent is methyl tetrahydrophthalic anhydride; the diluent is n-butyl glycidyl ether; the foaming agent is azodicarbonamide; the charring agent is pentaerythritol. By optimizing the diatomite modification process and combining physical dispersion and chemical modification means, the compatibility of the diatomite and the epoxy resin is greatly improved, the pain point of filler agglomeration in the traditional process is thoroughly solved, the porous sound insulation potential of the diatomite is fully released, and the sound absorption and sound insulation performance of the material is qualitatively improved.

The invention relates to low-viscosity high-strength two-component epoxy winding resin and a preparation method and application thereof, the resin comprises a component A and a component B, and the mass ratio of the component A to the component B is 100: (80-110); the component A consists of the following raw materials in percentage by mass: 70-85% of modified epoxy resin, 14-20% of a functional reactive diluent and 1-10% of an impregnating compound; the modified epoxy resin is formed by compounding bisphenol A epoxy resin and polyether modified epoxy resin, and the functional active diluent is formed by compounding 1, 6-hexanediol diglycidyl ether and phenyl glycidyl ether; the component B is prepared from the following raw materials in percentage by mass: 85-96% of a composite anhydride curing agent, 2.5-10% of a high-efficiency accelerant and 1.5-5% of a defoaming agent; the composite anhydride curing agent is compounded by methyl tetrahydrophthalic anhydride and succinic anhydride, the efficient accelerant is compounded by imidazole and phosphine, and the defoaming agent is an organic silicon defoaming agent.

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.

The invention discloses a polyimide-aluminum oxide composite film material and a preparation method thereof, the composite film material is composed of a polyimide layer and an aluminum oxide layer deposited and combined on the upper surface of the polyimide layer, and the thickness of the polyimide layer and the thickness of the aluminum oxide layer are both nanoscale; the composite film material is prepared by using atomic layer deposition equipment, and the preparation method comprises the following steps: firstly, depositing a nanoscale polyimide layer on a monocrystalline silicon piece carrier according to a set program by taking pyromellitic dianhydride and hexamethylenediamine as precursor raw materials; and depositing and combining a nanoscale aluminum oxide layer on the upper surface of the polyimide layer according to a set program by taking trimethylaluminum and distilled water as precursor raw materials. The prepared composite film material is different from a current composite film material prepared by blending polyimide and aluminum oxide and then carrying out film casting, the composite film material has a nano-scale polyimide layer with uniform thickness and a nano-scale aluminum oxide layer deposited and combined on the upper surface of the polyimide layer, and the composite film material has a good radiation refrigeration effect.

The invention relates to the field of ceramic packaging materials, in particular to a packaging material for a high-voltage-resistant ceramic side wall and a preparation method of the packaging material. The packaging material is prepared from an epoxy-silica hybrid prepolymer, an aluminum oxide and silicon dioxide core-shell composite filler, methylhexahydrophthalic anhydride and 2-ethyl-4-methylimidazole, wherein the hybrid prepolymer is prepared by carrying out hydrolytic condensation on bisphenol A diglycidyl ether, hydroxyl-terminated PDMS (Polydimethylsiloxane) and 3-glycidoxypropyltrimethoxysilane; low viscosity and low volatile matter are realized; the core-shell filler takes aluminum oxide as a core and silicon dioxide as a shell, and a shell layer is grafted with epoxy silane so as to be chemically bonded with resin. And after curing, the power frequency short-time electrical strength of the packaging layer is greater than or equal to 20 kV / mm, the partial discharge initial voltage is greater than or equal to 3 kV, the volatile matter is less than or equal to 1.0 wt%, and the water content is less than or equal to 0.2 wt%.

The application provides a preparation method of an indobufen key intermediate. The method uses 2-(4-nitrophenyl) butyric acid and phthalic anhydride as raw materials, and obtains the target compound (I) through a one-pot method. The method has the advantages of simple operation, mild conditions, high reaction yield, reduced cost through mother liquor recycling and reuse, significantly reduced "three wastes" and environmental protection, and is suitable for large-scale industrial production.

This invention belongs to the field of stone adhesive technology, specifically relating to a transparent stone splicing adhesive and its preparation method. The adhesive comprises a resin component and a curing component. The resin component includes maleic anhydride, phthalic anhydride, diol, catalyst, polymerization inhibitor, and crosslinking monomers, etc., and the diol includes at least 1,2-propanediol. The curing component includes an accelerator composed of dimethylaniline and zinc adipate, and a benzoyl peroxide initiator. The adhesive of this invention is colorless and transparent after curing, exhibits excellent resistance to yellowing, is easy to apply, and after curing with fillers, possesses excellent shear strength, water shear strength, and impact resistance. It can be widely used in high-end stone splicing, repair, and craft bonding.

The invention discloses preparation and application of a double-sided aluminized polyimide film for ultralow-temperature multilayer vacuum insulation, and relates to the technical field of polyimide film preparation. The invention relates to an ultralow-temperature multilayer double-sided aluminized polyimide film for vacuum heat insulation, which consists of a polyimide base film and aluminized layers formed on two surfaces of the polyimide base film through a vacuum evaporation method, the polyimide base film is prepared from the following raw materials in parts by mass: 100 parts of pyromellitic dianhydride, 4, 4 '-diaminodiphenyl ether, 5-15 parts of a low-temperature-resistant modifier, 3-8 parts of nano silicon dioxide filler, 0.5-2 parts of a flatting agent, 0.5-1.5 parts of an anti-aging agent, 3-6 parts of a silane coupling agent and 5-15 parts of polyvinyl chloride. The anti-aging agent with a specific structure is adopted, the phenolic hydroxyl group and the benzotriazole structure have a synergistic effect, free radicals can be captured, ultraviolet rays can be absorbed, the compatibility with a polyimide matrix is good, precipitation at low temperature is avoided, the problems that a traditional anti-aging agent is poor in low-temperature dispersion and prone to failure are solved, and the service life of the film is prolonged.

The invention relates to a preparation method and application of a nucleating agent. The preparation method comprises the following steps: mixing solvent pure water, calcium hydroxide and fatty acid methyl ester sulfonate, and heating; dropwise adding hexahydrophthalic anhydride into the mixed solution, and after dropwise adding is completed, carrying out heat preservation reaction to obtain the calcium hexahydrophthalate. The product has excellent performance when used for thermoplastic resin such as polyolefin.

The application discloses a water-based polyurethane for nail polish and a preparation method thereof, and relates to the technical field of water-based polyurethane. The water-based polyurethane for nail polish comprises mixed polyols, polyisocyanate, functional monomers, a hydrophilic agent, a post-chain extender and deionized water, wherein the mixed polyols are a combination of polycaprolactone glycol, phthalic anhydride polyester polyol and polyether polyol, and the functional monomers comprise amino type furan monomers and amino type maleimide monomers. Through the technical scheme, the glossiness and surface hand feeling of the water-based polyurethane after film formation can be effectively improved, and the apparent quality and product value of the nail polish prepared from the water-based polyurethane are improved.

This invention discloses a class of quinalidine disperse yellow dyes with high sublimation fastness and their synthesis method, belonging to the field of disperse dye technology. This invention uses Disperse Yellow 54 as the parent core and introduces one of the following substituents at the 6-position of the quinalidine ring: ethyl, n-propyl, cyclopropyl, cyclobutyl, cyclopropylmethyl, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, cyclopropoxy, cyclobutoxy, cyclopropylmethoxy, 2-methoxyethoxy, fluorine, chlorine, bromine, cyano, or nitro. This invention uses 6-substituted-2-methyl-3-hydroxyquinoline-4-carboxylic acid and phthalic anhydride as raw materials, and synthesizes the target dye in one step via a high-temperature condensation reaction. Experimental results show that the sublimation fastness of the dye of this invention reaches grade 4-5 or 5, significantly improved compared to Disperse Yellow 54 (grade 2-3), while maintaining excellent resistance to rubbing, perspiration, and sunlight. This invention has a simple synthesis process, high yield, and high purity, possessing extremely high industrial production value and market application prospects.

The invention relates to the field of oilfield chemical industry. The invention relates to a temporary plugging agent, in particular to a temperature-resistant and compression-resistant temporary plugging agent and a preparation method and application thereof. The temperature-resistant and compression-resistant temporary plugging agent comprises the following raw material components in parts by weight: 60-80 parts of polyimide; 5-10 parts of calcium carbonate nanofibers of which the surfaces are assembled with amphiphilic block copolymers; 0.2 to 4 parts of an auxiliary agent; wherein the polyimide is prepared by taking biphenyl tetracarboxylic dianhydride, p-phenylenediamine and phenylacetylene phthalic anhydride as polymerization reaction raw materials; the amphiphilic block copolymer assembled on the surface of the calcium carbonate nanofiber is polystyrene-b-polyacrylic acid. The temperature-resistant and compression-resistant temporary plugging agent provided by the invention has excellent high temperature resistance, compression resistance and plugging capacity, can be quickly hydrolyzed and crushed after temporary plugging is finished, can realize quick plugging removal, and is suitable for a high-temperature and high-pressure mining environment with the formation temperature (use environment) of 281-295 DEG C and the formation pressure of more than or equal to 130 MPa.

This invention discloses a method for preparing high-performance wood wax oil, belonging to the field of coating technology. The raw materials used in this wood wax oil are soybean oleic acid, maleic anhydride, grafting catalyst, glycerol, phthalic anhydride, esterification catalyst, vanadium drier, zirconium drier, carnauba wax, and beeswax. Compared to wood wax oils based on tung oil and linseed oil, the wood wax oil of this invention uses soybean oleic acid as the main material, utilizing maleic anhydride to perform graft copolymerization at the α-position of the carbon-carbon double bond in soybean oleic acid, thereby increasing the iodine value of the resin system. Increased iodine value leads to increased crosslinking points, thus ensuring drying properties and improving the hardness, drying performance, and yellowing resistance of the wood wax oil; weather resistance is significantly improved, and drying time is accelerated; no heavy metal driers such as cobalt and manganese are added, making it environmentally friendly; the preparation process of the wood wax oil of this invention is simple and easy to operate, with low material costs.

The invention relates to the technical field of energy storage, and discloses a naphthalene-containing polyimide copolymer, a preparation method thereof and an electronic device. The naphthalene-containing polyimide copolymer has a structure shown in a formula (I), wherein the formula (I) is shown in the description; wherein R1 is independently selected from residues of naphthalene-containing dianhydride, and the naphthalene-containing dianhydride comprises at least one naphthalene ring connected with two anhydride groups; r2 is independently selected from residues of a diamine monomer, and the diamine monomer comprises at least one benzene ring; r3 is independently selected from residues of a dianhydride monomer comprising at least two phthalic anhydrides; the ratio range of x to y is (1: 99)-(30: 70). The naphthalene-containing polyimide copolymer provided by the invention has better stability at high temperature and has better dielectric properties such as high dielectric constant, low dielectric loss and high breakdown strength.

The application discloses raw material oil for naphthalene distillation device and a production process using the same as raw material, the raw material oil comprises dephenol naphthalene oil and naphthalene residue, the weight ratio of the dephenol naphthalene oil and the naphthalene residue is (90-105):1, the naphthalene content of the raw material oil is controlled to be 72-76%, the dephenol naphthalene oil is obtained by dephenolizing naphthalene oil collected from a side line of a distillation column of a tar distillation device, and the naphthalene residue is a by-product generated by a phthalic anhydride device; the production process using the raw material oil for naphthalene distillation device as raw material combines the naphthalene distillation device and the phthalic anhydride device, uses the raw material oil as raw material, and prepares high-quality industrial naphthalene by optimizing process parameters, so that the additional value of the naphthalene residue is improved, the raw material cost is reduced, and the comprehensive benefits are greatly improved.

The invention belongs to the technical field of ortho-process phthalic anhydride catalyst preparation and filling, and discloses a six-section bed ortho-process phthalic anhydride catalyst and a filling method thereof.The catalyst is divided into six sections including R0, R1, R2, R3, R4 and R5, and the filling height of each section is R0 3 cm; r1 is 20 to 130 cm; r2 is 30 to 130 cm; r3 is 30 to 60 cm; r4 is 30 to 60 cm; r5 is 50 to 100 cm; and the total filling height is 260 to 370 cm. The contents of the main components in each section are as follows in percentage by weight: 3.0-20.0% of V2O5; the TiO2 accounts for 80.0%-97.0%, and the Sb2O3 accounts for 0.2%-5.0%; and 0.05 to 0.60 percent of Cs2CO3. By adopting the prepared catalyst and the filling method thereof, the load can reach 95 grams of phthalic acid / standard cubic meter of air, the yield of crude anhydride can reach 114.5 percent (100 percent by weight), and after the catalyst is used for three years, the content of phthalide in the crude anhydride can be less than or equal to 0.15 percent.

The invention relates to the field of substance purity analysis methods, and discloses a method for analyzing the purity of o-phthalic anhydride by using gas chromatography, which comprises the following steps: firstly, preparing a standard solution of which the concentration of each component is close to that of each component in crude phthalic anhydride to be analyzed, and analyzing the standard solution for more than three times; calculating a correction factor of each substance after the peak area repeatability error of each substance is less than 3%; and inputting the correction factor into a method-component table, comparing the spectrogram of the to-be-detected sample solution with the spectrogram of the standard substance solution, determining peak localization of corresponding substances in the to-be-detected sample solution according to retention time, and calculating the purity of phthalic anhydride in the to-be-detected sample by adopting an area correction normalization method. The method is simple to operate, short in analysis time and good in stability and reproducibility.

This invention discloses polyimide, its preparation method, and polyester electronic adhesive. This invention provides a polyimide whose polymerizing monomers include dianhydride monomers and diamine monomers, wherein the dianhydride monomer is selected from one or more of 4,4'-(4,4'-isopropyldiphenoxy)bis(phthalic anhydride), 3,3',4,4'-benzophenone tetracarboxylic dianhydride, 4,4'-oxybis(phthalic anhydride), and 2,3,3',4'-biphenyltetracarboxylic dianhydride; and the diamine monomer is selected from one or more of aminophenyl sulfone, 1,3-bis(4'-aminophenoxy)benzene, 2,2'-bis[4-(4-aminophenoxyphenyl)]propane, 4,4'-bis(3-aminophenoxy)diphenyl sulfone, 1,3-cyclohexanedimethylamine, 4,4'-diaminodiphenyl ether, dimericadiamine, and trimericadiamine. The polyimide of this invention can modify polyester or epoxy systems, significantly improving flame retardancy and adhesive peel strength. The coating process involves evaporation at relatively low temperatures, and the solvent in the system has a low boiling point, meeting the requirements of existing processes.

This invention relates to the field of flame retardant chemical synthesis technology, and discloses ethylene bis(tetrabromophthalimide) and its preparation method and applications. The method includes reacting phthalic anhydride and ethylenediamine in an aqueous medium at a controlled mass ratio of 3.0-5.5:1 to obtain an intermediate; reacting the intermediate with bromine in a fuming sulfuric acid medium, controlling the dropping temperature at 45-60℃ and the holding temperature at 130-150℃; and washing the reaction product followed by high-temperature heat treatment at 150-220℃ to constant weight. This invention effectively inhibits residual active amino groups and organic carbonization by strictly controlling the intermediate synthesis ratio and the temperature range of the bromination reaction. By utilizing high-temperature heat treatment, it thoroughly removes deep-seated acidic volatiles that cannot be removed by conventional drying, solving the problems of yellowing appearance, poor heat resistance, and easy corrosion of processing equipment in existing products. It is applicable to the field of flame-retardant engineering plastics.

The application discloses a preparation method of 3,4,5,6-tetrahydrophthalic anhydride by catalytic isomerization, and nitrogen-doped porous carbon is prepared by carbonizing melamine sponge, the nickel is loaded by cooperating with wetting of a surfactant and ultrasonic cavitation, and the loaded nickel catalyst is obtained by roasting and reduction. 1,2,3,6-tetrahydrophthalic anhydride is heated and refluxed in an organic solvent and catalyst to isomerize, the catalyst is recovered by filtration, and the product is obtained by cooling and crystallizing the filtrate. The method utilizes the through macroporous structure to eliminate the mass transfer resistance, and the nitrogen-anchored nickel prevents agglomeration, so that the catalyst is low in cost, recyclable and free of waste water.

The present application relates to the technical field of oil well chemical sand control, and particularly relates to a water-dispersible epoxy resin sand consolidating agent and a preparation method thereof. The water-dispersible epoxy resin with hydrophilic segments and self-emulsifying function is prepared by grafting polyethylene glycol monomethyl ether and phthalic anhydride onto epoxy resin E51 to generate esterification reaction, and the water-dispersible epoxy resin sand consolidating agent is further prepared by compounding the water-dispersible epoxy resin with polyamine curing agent and water, so that the oil field sand consolidating agent with environmental protection and excellent sand consolidation performance is finally obtained. The epoxy resin prepared by the present application has self-emulsifying function, and no additional emulsifier is needed when preparing the emulsion. The sand consolidation effect is excellent, and almost no toxic and harmful volatile gas is generated in the field use, which greatly improves the safety of well site operation, improves the operation environment, significantly reduces the air pollution, ensures the sand consolidation effect, and reduces the complexity and cost of the sand consolidating agent preparation.

The invention provides a novel lubricating oil detergent, a preparation method thereof and a lubricating oil composition. The preparation method comprises the following steps: mixing alkylphenol, base oil, a vulcanizing agent and a first part of calcium source, adding a first part of accelerant, and carrying out vulcanization reaction; then adding cyclic anhydride to carry out esterification reaction; and adding a second part of accelerant and a second part of calcium source, then carrying out carbonation reaction, and purifying the product after the reaction is finished to obtain the novel lubricating oil detergent. Wherein the cyclic anhydride is selected from one or a combination of more than two of maleic anhydride, succinic anhydride, adipic anhydride and phthalic anhydride; the addition amount of the cyclic anhydride is 0.01-0.25 part by weight based on 1 part by weight of alkylphenol. The cyclic anhydride participates in the reaction, so that the content of free phenol in the product can be reduced, and the wear resistance of the product can be improved. The novel lubricating oil detergent provided by the invention has no free phenol residue, and has more excellent detergency, oxidation resistance, wear resistance and the like.

The invention provides an application of a benzoate compound in a synthesis process of copper phthalocyanine, which comprises the following steps: S1, adding 3g of benzoate compound, 310g of 100% phthalic anhydride, 231g of urea and 1500ml of solvent alkylbenzene into a 3000ml three-neck bottle provided with a stirring device, a thermometer and a condenser, uniformly heating to 170 DEG C within 4 hours while stirring, and keeping the temperature for 2 hours; s2, 231 g of urea is added, the temperature is evenly increased to 190 DEG C within one hour, and heat preservation is conducted for 2 hours; s3, adding 61 g of 100% cuprous chloride and 4 g of 100% ammonium molybdate, uniformly heating to 210 DEG C within 5 hours, carrying out heat preservation and stirring reaction for 6 hours, and cooling to 100 DEG C; according to the application of the benzoate compound in the synthesis process of the copper phthalocyanine, a proper amount of the benzoate compound is added in the synthesis process of the copper phthalocyanine, so that the product yield is increased, the consumption of raw materials is reduced, and the emission of three wastes is reduced, and therefore, the production cost is reduced, and the pollution to the environment is reduced.

The invention discloses a preparation method of a 4-methylphthalic anhydride compound, and the specific method is as follows: in the presence of a solvent, 4-methyl-1, 2, 3, 6-tetrahydrophthalic anhydride reacts with a dehydrogenation reagent to prepare the 4-methylphthalic anhydride, 1, 3-dihalo-5, 5-dimethyl hydantoin is used as a dehydrogenation reagent. The method can overcome the problems of overhigh cost and low production efficiency in the existing method for preparing 4-methylphthalic anhydride, and has the advantages of high yield, convenience and safety in operation, low production cost and environmental friendliness.

The application relates to the technical field of insulating materials, and discloses a high-temperature-resistant polyvinyl chloride insulating material and application thereof in cables, which is prepared from p-chloroaniline, formaldehyde, bisphenol S, diethanolamine, phthalic anhydride and the like as raw materials through Mannich reaction, substitution reaction and ring-opening polymerization reaction to obtain phthalic anhydride polyester polyol, and then the phthalic anhydride polyester polyol, 4,4-diphenyl methane diisocyanate and 1,4-butanediol are used as raw materials to obtain modified thermoplastic polyurethane; the modified thermoplastic polyurethane is initiated and crosslinked with polyvinyl chloride resin and the like, is uniformly mixed, and the high-temperature-resistant polyvinyl chloride insulating material is obtained; and the polyvinyl chloride insulating material prepared by the application has good high-temperature resistance and wear resistance.

The utility model relates to a crude phthalic anhydride refining device which comprises a first rectifying tower, a first tower top condenser arranged on the first rectifying tower, a second rectifying tower communicated with the first rectifying tower, a second tower top condenser arranged on the second rectifying tower, and a first heating conveying pipe arranged on the second rectifying tower. A first regulating valve, a liquid phase return pipe, a first booster pump, a first external slag discharge pipe, a second regulating valve, a first reboiler and a gas-liquid separation tank are arranged on the first heating conveying pipe, a first gas conveying pipe is arranged between the gas-liquid separation tank and the second rectifying tower, and the liquid phase return pipe is communicated with the gas-liquid separation tank; an inlet end of an evaporation reaction kettle is arranged on the first external slag discharging pipe, the evaporation reaction kettle is communicated with the first gas conveying pipe, and a third rectifying tower is communicated with the evaporation reaction kettle. And the phthalic anhydride content in the residues subjected to rectification treatment can be reduced. The utility model has the advantages of convenient use and wide market prospect.

This invention relates to the field of polyimide resin technology, specifically to a high-heat-resistant thermosetting polyimide resin and its preparation method. The method includes: mixing aromatic dianhydride, aromatic heterocyclic diamine, siloxane-containing diamine, and 4-phenylethynyl phthalic anhydride in an organic solvent, and performing a polycondensation reaction at room temperature to obtain a polyamic acid solution; preparing a polyimide oligomer solution from the polyamic acid solution using a chemical imidization method, followed by washing, filtration, and drying to obtain a thermosetting polyimide oligomer powder; cold-pressing the thermosetting polyimide oligomer powder into a mold, and then heat-sintering and curing to obtain a cured resin. This invention simultaneously introduces a high-heat-resistant heterocyclic diamine and a siloxane-containing diamine into the thermosetting polyimide resin system, synergistically improving the heat resistance of the material. Its comprehensive properties, including heat resistance, mechanical properties, and chemical stability, are excellent. Its close melting and crosslinking temperatures, i.e., a narrow processing window, allow for the development of new methods for PI resin powder molding.

The application belongs to the field of electronic and electrical device packaging materials, and provides a high-heat-dissipation composite functional material and a preparation method and application thereof. Bisphenol A diglycidyl ether, diphenyl diglycidyl ether, 1,4-butanediol diglycidyl ether, 3-glycidyl ether oxypropyl trimethoxysilane, polyimide shell-coated hexagonal boron nitride core-shell filler, spherical alumina, methyl hexahydrophthalic anhydride and 2-ethyl-4-methyl imidazole are cooperatively designed, and the material is obtained through mixing, degassing and segmented curing. The obtained material has relatively high apparent thermal conductivity, volume resistivity, bending strength and breakdown strength, the uncured composition has suitable viscosity, the problems of poor fluidity under high filling conditions, limited processing window and difficult to balance high thermal conductivity and high electrical insulation are solved, and the material has good electronic and electrical device packaging application value.

This invention relates to the field of composite material technology, specifically to an aramid honeycomb based on magnetic microwave absorbing prepreg and its preparation method. The aramid honeycomb includes an aramid honeycomb core and a magnetic microwave absorbing prepreg layer covering the surface of the honeycomb core. The magnetic microwave absorbing prepreg, by mass percentage, contains 25%-30% magnetic microwave absorbing component, 40%-45% resin matrix, 20%-25% reinforcing fiber, 5%-8% dispersant (based on the magnetic microwave absorbing component), and a curing agent with a mass ratio of 1:1.2 to the resin matrix. The magnetic microwave absorbing component is selected from one or more of coated Fe3O4@SiO2 nanoparticles, nickel-doped MXene (Ni-Ti3C2), and ultrafine Fe-Si-Cr alloy powder, mixed in any proportion. The resin matrix is ​​E-51 modified epoxy resin with a glass transition temperature Tg ≥ 120℃; the reinforcing fiber is para-aramid fiber cloth (Kevlar49) with a length of 0.15 micrometers to 0.5 millimeters; the dispersant is polyetherimide (PEI); and the curing agent is methyltetrahydrophthalic anhydride (MeTHPA).

The invention discloses a synthetic method and application of a perfluorinated resin / SBA-15 composite catalyst, and belongs to the technical field of catalysts. The synthesis method of the composite catalyst comprises the following steps: dissolving the perfluorinated resin with ethanol, heating to 58-62 DEG C, adding 0.5 g of SBA-15 molecular sieve, stirring for 2-4 hours, and drying at room temperature. The catalyst combines the strong acidity of the perfluorinated resin and the high specific surface area and ordered mesoporous structure of the SBA-15 molecular sieve, when the catalyst is used for catalyzing phthalic anhydride and isooctanol to synthesize DOP, the catalyst shows excellent catalytic activity, good cycle stability and low by-product characteristics, and meanwhile, the product is low in acid value, can replace a traditional corrosive catalyst, and is suitable for industrial application.