683 results about "Alkylbenzenes" patented technology

The invention belongs to the technical field of building materials, and particularly relates to a micro-expansion anti-cracking waterproof composite deep groove filler and a preparation method thereof. The micro-bulking anti-cracking waterproof composite deep groove filler provided by the invention comprises cement, gypsum, mineral powder, nano silicon oxide, coarse aggregate, fine aggregate, modified fibers, an expanding agent, a polycarboxylate superplasticizer and water. According to the invention, polyacrylamide, calcium sulphoaluminate and magnesium oxide are adopted to jointly form an expanding agent, and early-stage-late-stage full-period shrinkage compensation is jointly formed in a concrete hydration process, so that the density of the concrete is effectively improved, and the waterproof performance of the concrete is further improved; according to the invention, sodium dodecyl benzene sulfonate and propylene glycol block polyether are adopted to carry out compound modification on graphene oxide, and gamma-aminopropyltriethoxysilane is connected to the surface of basalt fiber, so that the bonding strength of basalt fiber and a cement matrix and the compactness of the cement matrix are improved, and the waterproof and anti-cracking properties of concrete are further improved.

The invention discloses a combined inhibitor for high-mud-content scheelite flotation and application, belongs to the technical field of scheelite flotation, and aims to solve the technical problems that in the high-mud-content scheelite flotation process, argillaceous particle adsorption agents and gangue inhibition are not thorough, and an existing inhibitor is poor in selectivity, large in dosage and the like. The combined inhibitor comprises tannic acid / sodium humate and metal ions and is matched with the pH regulator to form a flotation reagent system, the collecting agent is prepared by compounding sodium oleate, oxidized paraffin soap and sodium dodecyl benzene sulfonate according to the mass ratio of 3: 1: 1, and the foaming agent is MIBC or terpenic oil. Through the synergistic effect of tannic acid / sodium humate-metal ions, mud dispersion and inhibition of fluorite and calcite can be synchronously achieved, and flotation of scheelite with the high mud content is enhanced; through one-stage roughing, three-stage scavenging and three-stage heating concentration, the grade and the recovery rate of WO in scheelite concentrate are improved, and the method is low in reagent dosage, environmentally friendly and suitable for industrial production.

The invention discloses a copper-clad plate material containing elastomer resin and a preparation method of the copper-clad plate material, and belongs to the technical field of new materials. The method comprises the following steps: mixing a styrene-butadiene-styrene block copolymer with polybutadiene rubber, adding nano-montmorillonite, and carrying out intercalation modification through hexadecyl trimethyl ammonium bromide to prepare nano-modified elastomer resin; the preparation method comprises the following steps: mixing polybutylene terephthalate with nano silicon dioxide, and carrying out surface modification by gamma-aminopropyltriethoxysilane and hexamethyldisilazane to obtain a resin matrix; mixing the two phases, adding citric acid, and carrying out microwave heating and high-shear dispersion to obtain a discrete material; carrying out hot pressing on the dispersion, adding polyurethane and polylactic acid, uniformly mixing, adding polydimethylsiloxane and sodium dodecyl benzene sulfonate, and curing to obtain a cured product; and coating the surface of the cured product with a nano-copper layer. The material has the characteristics of high peel strength, low dielectric loss, low water absorption and low thermal expansion, and is suitable for the field of high-speed low-loss copper-clad plates.

The application discloses an aluminum alloy surface fine polishing polishing composition, polishing liquid and application thereof, and particularly belongs to the technical field of metal surface treatment. The polishing composition comprises the following components in mass fraction: 70-80 parts of silica sol, 1-4 parts of dispersing agent, 5-7 parts of surfactant, 5-10 parts of corrosion inhibitor, and 0.5-2 parts of water-retaining agent; and the surfactant is composed of perfluoropolyether, coconut oil alkylolamide and sodium dodecyl benzene sulfonate. The polishing composition provided by the application has high polishing efficiency, can reduce polishing cost, improve product quality, has low material surface roughness and few scratches after polishing treatment, effectively improves the polishing surface quality, improves the overall appearance and durability of the material, and the polishing liquid does not contain toxic substances such as chromium / phosphorus, and is environment-friendly.

The present invention relates to liquid aqueous detergent compositions comprising a surfactant system comprising a primary surfactant being anionic surfactant and a secondary surfactant being amphoteric surfactant whilst the surfactant system is free of alkylbenzene sulphonates and derivatives thereof. The invention further relates to a method of cleaning a stainless-steel hard surface using the composition of the invention, as well as the use thereof.

The invention belongs to the technical field of medicinal chemistry, and particularly relates to a 3-sulfamoyl benzamide compound as well as a preparation method and application thereof. The 3-sulfamoyl benzamide compound has a structure as shown in a formula I. In the formula I, X is chlorine or trifluoromethyl; r1 and R2 are independently C1-4 alkyl or R1, R2 and N atoms connected with R1 and R2 jointly form a heterocyclic group, and the heterocyclic group is a substituted or unsubstituted five-membered or six-membered heterocyclic group; and when the heterocyclic group is a substituted heterocyclic group, the substituent group in the substituted heterocyclic group is one or more of C1-4 alkyl, phenyl and acetyl. The 3-sulfamoyl benzamide compound disclosed by the invention has a remarkable proliferation inhibition effect on HCT116 colon cancer cells, HeLa human cervical cancer cells, MDA-MB-231 human breast cancer cells and A375 human malignant melanoma cells.

The invention discloses a defoaming agent for industrial automobile paint and a preparation method of the defoaming agent. The defoaming agent is prepared from the following raw materials in parts by mass: 20-40 parts of a star block polyether-siloxane copolymer; 10 to 25 parts of nano hydrophobic silicon dioxide aerogel; 30-70 parts of an alkylbenzene solvent (boiling point gt: 200 DEG C); 3 to 8 parts of epoxy group modified polyether siloxane; and 1 to 3 parts of polyether modified polydimethylsiloxane. The molecular weight range of the star block polyether-siloxane copolymer can effectively balance the defoaming property and compatibility, the siloxane chain segment of the star block polyether-siloxane copolymer destroys the elasticity of a foam film, and the siloxane chain segment cooperates with alkylbenzene to reduce local surface tension and accelerate foam rupture. The polyether chain segment and the siloxane chain segment have a synergistic effect, and the polyether chain segment adjusts hydrophilicity to adapt to different environments.

The invention discloses a hydrogenation device scale inhibitor for heavy high-sulfur raw oil and a preparation method of the hydrogenation device scale inhibitor, and relates to the technical field of scale inhibitors. The scale inhibitor is prepared from a polyisobutylene succinimide dispersing agent, a high-temperature-resistant scale inhibition dispersing agent, an anti-rust agent, an imidazoline corrosion inhibitor, an antioxidant, a sulfide chelating agent, a clearing agent, cup carbazole alkylbenzene sulfonate and a solvent in specific parts by weight. The preparation method comprises the following steps: heating the solvent to 80-100 DEG C, sequentially adding the other components, and stirring for 30-40 minutes. Aiming at the characteristics of heavy high-sulfur raw oil, the scale inhibitor realizes high scale inhibition rate, excellent high-temperature stability and strong sulfur corrosion resistance through a multi-component synergistic effect, effectively solves the problems of scaling and corrosion of a hydrogenation device, prolongs the operation cycle of the device, and is suitable for a hydrogenation process of high-sulfur and high-asphaltene raw oil.

The invention relates to a high-toughness anti-crack magnetic decorative film and a preparation method thereof. The decorative film is prepared from the following raw materials in parts by weight: 40 to 60 parts of poly (dihydrothiophene-vinyl ether) copolymer, 10 to 25 parts of shell layer self-assembly modified Fe3O4 nanosheets, 5 to 15 parts of polyether ester block elastomer, 0.5 to 2 parts of sodium dodecyl benzene sulfonate, 0.5 to 1.5 parts of fluorosilane coupling agent, 0.1 to 1.0 part of 2-hydroxybenzotriazole ultraviolet absorbent, 3 to 6 parts of bisphenol A type epoxy curing agent and 0.05 to 0.5 part of imidazole catalyst. The flexible copolymer is synthesized through copolymerization of dihydrothiophene and vinyl ether, the modified Fe3O4 nanosheets form a Fe3O4 structure through coprecipitation of ferric chloride and ferrous chloride and regulation and control of ammonia water, and shell self-assembly coating is carried out through tetraethoxysilane and a block micromolecule interface agent. The material has excellent tensile strength, elongation at break, magnetic adsorption force and cycling stability, and is suitable for the application fields of flexible magnetic films and high-adhesion decorations.

The invention provides a compound with an electron transmission function, an organic electroluminescent device containing the compound and application of the compound, the structure of the compound takes 9-alkyl-9-phenyl fluorenyl, phenanthryl and a triazine group as main components, the 9-alkyl-9-phenyl fluorenyl is one of core structures, fluorene is a polycyclic aromatic hydrocarbon with better planarity, and the triazine group is one of the core structures. Alkyl and phenyl are introduced to the ninth site to generate strong spatial repulsive force with a fluorene ring, a three-dimensional and non-planar propeller-shaped structure is formed, and the non-planar structure can effectively inhibit close packing of molecules in a solid state, so that concentration quenching and excimer formation caused by pi-pi packing are prevented, and the stability of the fluorescent probe is improved. And moreover, the rigid and non-planar structure can also effectively improve the thermal stability of the material, and the service life of the device is prolonged. The compound provided by the invention is used as an electron transport layer and a hole blocking layer in a light-emitting device, so that the device has low driving voltage, high luminous efficiency and long service life.

The invention discloses a modified nano hydrated calcium silicate chloride ion curing agent as well as a preparation method and application thereof, and belongs to the technical field of chemical materials. The curing agent is composed of 65-75 parts of synergistically modified nano calcium silicate hydrate, 10-20 parts of mesoporous silica with a high specific surface area, a composite dispersion stabilizer with a specific ratio, and an active activator compounded by triethanolamine and anhydrous sodium sulfate. The nano calcium silicate hydrate is synergistically modified by gamma-aminopropyltriethoxysilane and sodium dodecyl benzene sulfonate, so that the nano calcium silicate hydrate has the excellent performance that the zeta-potential absolute value is greater than or equal to 25 mV, the dispersity is high, and the chloride ion binding capacity is improved by greater than or equal to 40%. Through the synergistic effect of all the components, the technical problems that an existing chloride ion curing agent is low in adsorption capacity, poor in selectivity, prone to agglomeration in concrete and the like are solved, and the chloride ion curing agent is particularly suitable for improving the durability of the concrete in harsh chloride salt environments such as port engineering and maritime work structures.

The invention provides an anisotropic ion transmission supercapacitor based on topological insulator electrolyte. Relates to the technical field of energy storage devices, and comprises an electrolyte module, the electrolyte module comprises an electrolyte, the electrolyte is a network formed by Bi2Se3 nanowires, and the Bi2Se3 nanowires form an anisotropic ion transport channel through a surface modification method of sodium dodecyl benzene sulfonate and vertical orientation arrangement. According to the anisotropic ion transmission supercapacitor based on the topological insulator electrolyte, an electrolyte module with anisotropic ion transmission characteristics is formed by adopting a network formed by topological insulator electrolyte Bi2Se3 nanowires and a surface modification technology. The electrode performance of the electrode module is enhanced through a vertical heterojunction structure, laser reduction, plasma etching and other processes, and therefore the excellent performance of the solid-state supercapacitor in the aspects of high energy density, low-temperature stability and structural stability is achieved.

Processes for dehydrogenating normal paraffins derived from natural oils to olefins are described. The feed stream is passed through an adsorption bed comprising alkaline or alkaline earth cation exchange X-Zeolite to removes essentially all oxygenates and aromatics from the feed stream. One or more additional adsorbent beds having different adsorbents can also be included to remove additional oxygenates and aromatics as well as sulfur compounds, nitrogen compounds, phosphorous compounds, or combinations thereof. The dehydrogenation process can be part of a process for producing alkylbenzenes from natural oils.

A refrigerating machine oil containing alkylbenzene and a hydrocarbon oil other than alkylbenzene having a refractive index of 1.445 or less at 20 DEG C.

The application discloses a kind of anti-freezing concrete and preparation method of multi-generation recycling, the concrete is by following raw material is formed according to weight parts: cement 405~418 parts, nano silicon dioxide 8~20 parts, river sand 680~735 parts, recycled coarse aggregate 865~890 parts, water 168~194 parts, polycarboxylate superplasticizer 2.2 parts and alkyl benzene sulfonate air entraining agent 0.05~0.1 parts.The application uses nano silicon dioxide as raw material, which has high specific surface area and pozzolanic activity, and the alkyl benzene sulfonate air entraining agent reduces the aggregation of nano silicon dioxide, not only promotes its uniform dispersion in concrete, but also makes the pore distribution in concrete uniform, thereby improving the mechanical properties and frost resistance of concrete, and the second generation and third generation recycled coarse aggregate obtained by crushing after 400 freeze-thaw cycles can be used in structural concrete in cold regions, greatly reducing material waste and environmental pollution.

The present application provides a photosensitive resin composition, dry film resist, photosensitive dry film and application thereof. The photosensitive resin composition comprises 45-60 parts of alkali-soluble resin, 35-50 parts of photopolymerization monomer, 2.5-5 parts of photoinitiator and 0.1-0.8 parts of sensitizer; the sensitizer is a compound shown in the general formula, R1 represents methylene or carbonyl, n represents 0 or 1; R2 represents phenyl, and any hydrogen atom on R2 is optionally substituted by methoxy, C1-C 10 alkyl, phenyl, benzyl or phenoxy. The sensitizer of the present application can make the product have better photosensitivity and resolution. Moreover, based on the above specific weight parts of alkali-soluble resin, photopolymerization monomer, photoinitiator and sensitizer, the comprehensive performance of the product of the present application is better.

The present application relates to a kind of preparation method of substituted alkylbenzene.The method includes: substituted aromatic ketone flows through catalyst bed and is reacted, the catalyst bed includes: hydrogenation catalytic bed and intramolecular dehydration catalytic bed of alternative arrangement, and the first section and the last section of the catalyst bed are hydrogenation catalytic bed;The reaction is carried out in the presence of non-alcohol solvent.The present application is in the presence of non-alcohol solvent, using substituted aromatic ketone is synthesized in the catalyst bed with hydrogenation catalytic bed and intramolecular dehydration catalytic bed of alternative arrangement, and the first section and the last section of the catalyst bed are hydrogenation catalytic bed, substituted alkylbenzene, with the advantages of high reactant conversion, high selectivity of product substituted aromatic ketone, simple post-processing.

The present invention relates to a bismuth-containing catalyst of formula (R1)2-(R2)-(Bi)3+ (I), wherein (R1)2- is a dianion of formula (II*), wherein A is unsubstituted or at least monosubstituted linear C3-30-alkylene, wherein at least two not adjacent CH2 groups of C3-30-alkylene are replaced by a heteroatom independently selected from the group consisting of O, S, 5 NH, N-C1-30-alkyl, N-C6-14-aryl and N-C7-30-aralkyl, wherein alkyl and aryl fragments of N-C1-30-alkyl, N-C6-14-aryl, N-C7-30-aralkyl may at least be monosubstituted by hydroxyl, halogen, -CF3, NH2, -NH-C1-6-alkyl, -NH- phenyl, -N(C1-6-alkyl)2, -N(phenyl)2, -SH, -S-C1-6-alkyl, -S-phenyl, -O-C1-6-alkyl or -O-phenyl, to process for the preparation of the bismuth containing catalyst, to a process for the preparation of a compound, oligomer or polymer comprising at least one urethane group using the bismuth-containing catalyst, to a composition comprising (i) at least one monoalcohol (B1) or polyol (B2), (ii) at least one polyisocyanate (A) and (iii) the bismuth-containing catalyst, to a coating or adhesive layer formed from the composition on a substrate, to a foam formed from the composition, and to the use of the bismuth-containing catalyst in for preparing compounds, oligomers or polymers comprising a urethane group, as esterification and transesterification catalyst and as catalyst for ring-opening polymerizations of lactones and epoxides.

The invention relates to a photocatalyst-based antibacterial modified cotton fiber and a preparation method thereof.The preparation method of the photocatalyst-based antibacterial modified cotton fiber comprises the following steps that S1, bismuth vanadate powder and sodium dodecyl benzene sulfonate are added into water and stirred, and a mixed solution is obtained; s2, adding starch octenyl succinate into water, and gelatinizing under a stirring condition to obtain gelatinized liquid; s3, mixing the gelatinized liquid and the mixed liquid, homogenizing, and spray-drying to obtain microcapsules; s4, adding microcapsules into ethanol, and adding azobisisoheptonitrile under a stirring condition, so as to obtain a modified solution; s5, cotton fibers are put into water in advance to be swelled and then put into the modification liquid, a reaction is carried out under the protective gas atmosphere, washing and drying are carried out, and the antibacterial modified cotton fibers based on the photocatalyst are prepared. The bismuth vanadate powder with photocatalytic activity is introduced into the cotton fiber in a chemical bonding manner, so that the cotton fiber is endowed with a lasting photodynamic antibacterial effect.

The invention belongs to the technical field of propellant treatment, and provides a composite decontaminant and a preparation method and application thereof in order to solve the problems that an existing neutralization decontaminant is complex in component, not high in stability and high in cost, and particularly, the composite decontaminant is prepared through the characteristic that transition metal coordination bonds are stabilized through Lewis acid metal ions and the coating effect of a surface active agent. Cu < 2 + >, Fe < 3 + >, sodium dodecyl benzene sulfonate and carboxyl-rich graphene oxide are compounded to prepare the composite decontamination agent. The composite decontaminating agent synthesized by the invention has a relatively good decontaminating effect on an unsymmetrical dimethylhydrazine propellant; the escape inhibition rate on unsymmetrical dimethylhydrazine reaches 35.1 percent.

A compound having formula I that is useful for preparing an anabaenopeptin or derivatives thereof is provided:or a salt thereof and / or stereoisomers thereof and / or isotopic variations thereof, wherein: X1, X2, X3, and X4 are alkyl, aryl, hydroxyl, alkyl phenyl, alkyl phenol, and benzyl groups; and R1, R2, R3, R4, and R5 are H or C1-10 alkyl, wherein at least one of X1, X2, X3, and X4 is alkyl phenol, with the proviso that at least one of X1, X2, X3, and X4 are alkyl phenol.

The present application belongs to the technical field of condensate, and particularly relates to a non-peptide small molecule condensate and preparation and application thereof. The present application provides a non-peptide small molecule condensate which is prepared by taking a small molecule shown in formula I as a precursor, wherein Y and Z are each independently NH, O or S, R = or X = O or S; R1 and R2 are each independently selected from H, C 3‑20 alkyl, -C 1‑8 alkylene-phenyl, -C 1‑8 alkylene-5-10-membered heteroaryl, -C 1‑8 alkylene-S-C 1‑8 alkyl, -C 1‑8 alkylene-SH, -C 1‑8 alkylene-O-C 1‑8 alkyl or -C 1‑8 alkylene-NH-C 1‑8 alkyl; and R1 and R2 are not H at the same time. The obtained condensate not only has good spontaneous non-classical fluorescence characteristics, but also has the abilities of drug loading and controllable release, and shows excellent resistance to enzymatic hydrolysis and good biocompatibility. Formula I

The invention discloses an efficient flame-retardant fire extinguishing agent for rapidly extinguishing a lithium battery fire and a preparation formula, and relates to the technical field of fire fighting. The fire extinguishing agent is composed of a liquid-phase component and a solid-phase component, wherein the liquid-phase component comprises ethylene glycol, triethanolamine, fluoroalkyl betaine, sodium dodecyl benzene sulfonate, a phosphate flame retardant, an orange peel extracting solution and purified water; the solid-phase component comprises dodecyl sulfate, ammonium phosphate, potassium perchlorate, sodium carboxymethyl cellulose, polyacrylamide, benzotriazole and the like. The method comprises the following steps: drying and activating solid-phase components after graded crushing, and stirring in a nitrogen atmosphere; carrying out segmented treatment on liquid-phase components, and carrying out ultrasonic emulsification on an orange peel extracting solution; and after solid-liquid mixing, carrying out vacuum defoaming, high-speed shearing dispersion and homogenization treatment. According to the lithium battery fire extinguishing agent, component particle sizes with different dissolution rates are matched through graded crushing, nanoscale dispersion is achieved through ultrasonic emulsification, the bubble residual rate is reduced through vacuum defoaming, and the problems that a traditional lithium battery fire extinguishing agent is low in insulativity, low in cooling efficiency and insufficient in flame retardant efficiency are solved.

A simple synthetic method of adamantane formate belongs to the technical field of adamantane formate, and comprises the following steps: 1) preparing adamantane formyl chloride: under the protection of nitrogen, carrying out heating reflux reaction on adamantane carboxylic acid and an acyl chloride reagent at 0-70 DEG C for 3-6 hours, and then carrying out rotary evaporation to obtain adamantane formyl chloride; dichloromethane, an acid-binding agent and an alkyl alcohol / alkylphenol mixture are added into the adamantane formyl chloride obtained in the step 1 through a dropping funnel, the mixture reacts for 8-10 h at the temperature of 0-30 DEG C, adamantane formate is synthesized and can be used for preparing lubricating oil, and the method is easy and convenient to implement, high in reaction rate, high in product yield and high in purity.

This invention provides a method for processing textile products that is highly effective in deodorizing odors caused by sebum stains on textile products after dehydration. [Solution] (a) A specific alkylbenzene sulfonic acid or a salt thereof, (b) General formula R 1 O-(EO) p -Specific compounds represented by SO3M, (c) General formula R 2 O-(A2O) n A method for treating textile products, comprising bringing a textile product to contact with a soiled textile product a treatment liquid containing a specific compound represented by -H, a fragrance composition containing a specific fragrance compound, and water, wherein the total content of component (a), component (b), and component (c) in the treatment liquid is 100 mg / kg or more and 800 mg / kg or less, the mass ratio of the content of component (b) to the content of component (a) [(b) / (a)] is 0.5 or more and 0.9 or less, and the mass ratio of the content of component (c) to the total content of component (a) and component (b) [(c) / {(a)+(b)}] is 0.2 or more and 0.7 or less.

The invention relates to a preparation method of a bamboo secondary particle coating and hard carbon sealing pore structure. According to the method, bamboo powder is used as a raw material, and the functional carbon material with a closed pore structure and a surface coating layer is prepared through the steps of staged carbonization, mechanical grinding, composite coating, aftertreatment and the like. Firstly, bamboo powder is subjected to low-temperature carbonization and high-temperature carbonization treatment, the heating and cooling rate is controlled under the nitrogen atmosphere, and carbonized bamboo powder is obtained; then mixing and grinding the mixture with a solid electrolyte and PVDF, and performing low-temperature carbonization again to form secondary particles; then, gelatin and calcium gluconate monohydrate are used as coating agents and stirred together in a sodium dodecyl benzene sulfonate solution, and surface coating is achieved; finally, freeze-drying, carbonizing at low temperature, pickling with hydrochloric acid, washing with water to be neutral, and drying to obtain a final product. The method is controllable in process and good in repeatability, and has good mechanical strength, chemical stability and function adjustability.

The invention belongs to the technical field of metal processing lubrication, and provides high-extreme-pressure anti-wear emulsion type expanding oil and a preparation method of the high-extreme-pressure anti-wear emulsion type expanding oil. Comprising the following steps: compounding naphthenic base oil, polyalkyl benzyl sulfide, vulcanized vegetable oil, sodium dodecyl benzene sulfonate, octylphenol polyoxyethylene ether, benzotriazole and methyldiethanolamine according to specific parts by mass to construct a carrier-extreme pressure-emulsification-corrosion prevention integrated system; wherein the naphthenic base oil (the kinematic viscosity at 40 DEG C is 350-400 mm / s) provides a stable carrier, the polyalkyl benzyl sulfide (the sulfur content is 20-30%) is a chloride-free extreme pressure core, the composite emulsifier ensures the stability of the system, and efficient protection is realized through double-component corrosion prevention; according to the invention, the 3% emulsion can be stably placed for more than or equal to 2 weeks, the maximum non-seizure load is more than 1800N, the emulsion is suitable for expanding large-diameter steel pipes made of Q235A, X70 / X80 and the like and cold forming processing of metal, the problems of insufficient extreme pressure, unstable emulsification, poor environmental protection property and the like of the existing product are solved, and the processing quality and efficiency are improved.

The application discloses a light heat-insulation material, which uses silicate cement as a basic material of the light heat-insulation material, uses hydrogen peroxide as a foaming agent, uses sodium dodecyl benzene sulfonate as a surfactant, reduces the surface tension of bubbles, uses calcium stearate as a foam stabilizer, uses PP fiber to improve the flexibility of the material, and adjusts the addition amount of metakaolin to obtain the light heat-insulation material, which meets the use requirements of porosity, thermal conductivity and compressive strength. Compared with the same material in the prior art, the raw material composition is simple, the preparation process is convenient, and production is efficient. In addition, if the addition amount of metakaolin is too low, the compressive strength of the light heat-insulation material is insufficient, and if the addition amount of metakaolin is too high, the porosity of the light heat-insulation material is too low and the thermal conductivity is too high. Therefore, compared with 100 parts by weight of the silicate cement, the addition amount of metakaolin needs to be controlled in a range of 36 parts by weight to 73 parts by weight.

The invention provides a modified maleimide prepolymer, a resin composition and application thereof, and the modified maleimide prepolymer is obtained by reacting the following components: 5-60 parts by weight of a first maleimide compound as shown in a structural formula (1); 10-70 parts by weight of a second maleimide compound represented by a structural formula (2); 5-50 parts by weight of a third maleimide compound represented by a structural formula (3); 20 to 70 parts by weight of a diamino compound; 0.1 to 10 parts by weight of a reaction aid; in the structural formula (1), R is hydrogen, C1-C5 alkyl, phenyl or n is an integer of 1-10; in the structural formula (2), n is an integer from 1 to 10; in the structural formula (3), R1 and R2 are respectively hydrogen or C1-C5 alkyl. The modified maleimide prepolymer provided by the invention has good solubility and reactivity.

The invention relates to the technical field of graphene modification, and particularly discloses a preparation method of modified graphene for lubricating oil, which comprises the following steps: ultrasonically dispersing graphene in water to obtain a graphene dispersion liquid; potassium octadecyl benzene sulfonate is added into the graphene dispersion liquid, and a stirring reaction is performed for 10-20 min; then adding ammonium molybdate and sodium sulfide into the system, adjusting the pH value of the reaction system to 4.5-6, and reacting for 1-2 hours under the reflux stirring action at 60-110 DEG C; adding hydroxylamine hydrochloride into the reaction system, and continuously stirring to react for 2-4 hours; and finally, carrying out centrifugal separation on the reaction liquid, washing with ethanol and distilled water for multiple times, and carrying out centrifugal separation to obtain the modified graphene. According to the preparation method of the modified graphene provided by the invention, a stable and uniform lubrication enhancement layer can be constructed on the surface of the graphene in situ, so that the graphene is endowed with excellent oil solubility and oil phase dispersion stability.