269 results about "Butyraldehyde" patented technology

The invention relates to the technical field of functional materials, in particular to a polyvinyl butyral flexible material as well as a preparation method and application thereof. The molecular chain regularity is destroyed through an isobutyraldehyde branched chain, the crystallinity is reduced, and the flexibility is improved; cesium-tin co-doped tungsten oxide has high infrared rejection rate and good dispersity, and the influence on the flexibility of the material is reduced; magnesium salicylate and magnesium formate are compounded, so that the reaction activity with resin is reduced, and the bonding stability in the bending process is ensured; the flexibility and migration resistance of the material are synergistically improved through the flexible plasticizer, and the interlayer sheet is prevented from being sticky; the flexible reinforcing agent polycaprolactone micro powder is used for forming an elastic node, bending stress is absorbed, and the recovery performance is improved. The polyvinyl butyral flexible material provided by the invention has flexible bending performance, an efficient infrared barrier function and stable bonding performance, is suitable for scenes such as curved building curtain walls, special-shaped automobile sunroofs or arc-shaped rail traffic windows, and has a wide application prospect.

The invention relates to the technical field of PVB (polyvinyl butyral) films, in particular to a full-wave-band heat-shielding modified PVB composite film as well as a preparation method and application thereof. The full-band heat shielding modified PVB composite film provided by the invention is of an asymmetric structure and comprises a modified PVB matrix and a heat shielding coating covering one side of the modified PVB matrix, the modified PVB matrix is prepared from the following components: polyvinyl butyral and an epoxy silane coupling agent; the heat shielding coating comprises the following components: CsWO3 nano powder, ZnO nano powder, water-based acrylic resin and a composite dispersion system; the composite dispersion system comprises triethylene glycol di-2-ethylhexoate, polyvinylpyrrolidone and diethylene glycol monobutyl ether. The full-wave-band heat shielding modified PVB composite film provided by the invention can realize 780-2500nm full-wave-band near-infrared high-efficiency barrier, improve the binding force and performance stability of a heat shielding coating, and meet the production requirements of light weight, environmental protection and industrialization at the same time.

The low-VOC modified melamine formaldehyde resin is prepared from the following components in parts by weight: 80 to 100 parts of melamine formaldehyde resin, 5 to 10 parts of hydroxyl-terminated hyperbranched polyester, 8 to 15 parts of epoxy-terminated polybutadiene, 1 to 3 parts of fumed silica, 5 to 15 parts of polyvinyl butyral, 0.1 to 0.2 part of a coupling agent, 1 to 3 parts of a catalyst and 2 to 5 parts of a cross-linking agent, the preparation method comprises the following steps: in a stirring state, adding hydroxyl-terminated hyperbranched polyester, epoxy-terminated polybutadiene, a polyvinyl butyral resin solution and coupling agent modified fumed silica into a melamino-formaldehyde resin solution, heating to 50-70 DEG C, and adding a catalyst and a cross-linking agent; the melamine modified resin prepared by the components and the preparation method has the characteristics of low formaldehyde volatilization, high toughness and durability.

The invention relates to a preparation method of quartz sand, and belongs to the technical field of quartz. The preparation method comprises the following steps: S1, adding a polyvinyl butyral solution into silica sol, and uniformly stirring to obtain silica sol dispersion liquid; the polyvinyl butyral solution comprises polyvinyl butyral (PVB) and tert-butyl alcohol; s2, performing spray drying on the silica sol dispersion liquid to obtain quartz microspheres; and S3, carrying out oxidation carbon removal treatment and vacuum dehydroxylation treatment on the quartz microspheres to obtain the quartz sand. Drying cracking and micro-hollow structure defects of the quartz sand can be effectively eliminated, it is ensured that the product is compact and free of pores, and the structural integrity and the use reliability are greatly improved; the density performance bottleneck of quartz sand is successfully broken through, and the bulk density after sintering is remarkably improved; the particle size distribution of the quartz sand can be accurately controlled, and the product particle size uniformity is ensured.

The invention discloses a water-based environment-friendly coating and local printing transfer paper thereof, and particularly relates to the technical field of water-based environment-friendly coatings. The water-based environment-friendly coating is prepared from a water-based epoxy ester dispersion, an organic silicon modified polyvinyl butyral emulsion, a gas-phase method aluminum oxide nano dispersion, a fluorocarbon surfactant, a self-crosslinking polyether thickening agent and a propylene glycol methyl ether acetate-water azeotropic quick-drying auxiliary agent. According to the coating, through cooperation of specific components and process control, the drying speed is remarkably increased, the surface drying time is shortened, meanwhile, shrinkage cavities are eliminated, the hardness of the coating is enhanced, and the edge transfer precision is improved. Corona treatment is adopted for the corresponding local printing transfer paper, gravure precise coating, infrared pre-drying and gradient hot air drying are matched, and finally clear separation and transfer of a coating are achieved through infrared laser scanning. The whole system is a water-based formula, is environment-friendly and safe, is suitable for the field of high-end printing, and has the comprehensive advantages of high drying speed, high precision, strong adhesive force, simplified process and the like.

The invention relates to the field of layered composite fabrics, and discloses a cooling and heat-insulating layered composite fabric and a preparation method thereof. The composite fabric has a multi-layer structure of a coating and a fabric layer, silicon dioxide microsphere loaded maleic anhydride modified PVB and organic silicon modified polyurethane acrylate are introduced into the coating, a light-oxygen dual-curing system is constructed, and silicon dioxide, polyvinyl butyral and polydimethylsiloxane which are good in intrinsic infrared emission performance are introduced, so that the intrinsic infrared emission performance of the composite fabric is improved, and the intrinsic infrared emission performance of the composite fabric is improved. The cooling performance of the coating material is improved through multi-component synergism of nano Al2O3 with good heat reflection performance, and the cooling and heat insulation performance of the composite fabric is comprehensively improved by combining the excellent heat insulation performance of the special-shaped cross-section fibers in the fabric layer.

The invention discloses a basalt fiber reinforced asphalt mixture based on solid waste synergy and a preparation method of the basalt fiber reinforced asphalt mixture, and belongs to the field of asphalt mixtures. The basalt fiber reinforced asphalt mixture based on solid waste synergy is prepared from the following raw material components in parts by mass: 1000 to 1200 parts of aggregate, 3 to 5 parts of modified basalt fiber, 50 to 73 parts of waste rubber modified asphalt, 2 to 4.38 parts of amphiphilic epoxy resin, 0.7 to 1.5 parts of curing agent and 0.06 to 0.13 part of accelerant, the modified basalt fiber is obtained by modifying triethoxysilyl butyraldehyde, 3-mercaptopropyltrimethoxysilane and allyl-1, 3-sultone, and the modified basalt fiber is prepared by modifying the triethoxysilyl butyraldehyde, the 3-mercaptopropyltrimethoxysilane and the allyl-1, 3-sultone; the amphiphilic epoxy resin is obtained by reacting dodecyl succinic anhydride, polyethylene glycol monomethyl ether 2000 and epoxy resin; m-phenylenediamine and 2-amino-4-cyanopyridine are adopted as the curing agent; n-methylimidazole is adopted as the accelerant; the asphalt mixture prepared by the invention has good rut resistance, crack resistance and water stability.

The utility model belongs to the technical field of chemical solvent preparation, and particularly relates to a tetrahydrofuran purification device. The utility model provides a tetrahydrofuran purification device. The tetrahydrofuran purification device comprises a feed port, a catalytic hydrogenation reaction part, a gas phase discharge port, a liquid phase discharge port, a heavy component removal tower and an absorption tower. In the application, through the catalytic hydrogenation part, the impurity dihydrofuran in the tetrahydrofuran is hydrogenated to generate the tetrahydrofuran, the impurities n-butyraldehyde and isobutyraldehyde are hydrogenated to generate alcohols which are easily separated from the tetrahydrofuran, through determination, the content of the impurity dihydrofuran in the purified tetrahydrofuran is reduced to 3 ppm or below, the alcohols are separated in the heavy component removal tower, and the content of the tetrahydrofuran in the tetrahydrofuran is reduced to 3 ppm or below. The purity and the quality of tetrahydrofuran are effectively improved, and the purification device structure and the purification process are simple.

The invention discloses an anti-ultraviolet heat-insulating radiation-proof water-based glass paint and a preparation process thereof. The anti-ultraviolet heat-insulating radiation-proof water-based glass paint is prepared from the following raw materials in parts by weight: 30-50 parts of acrylic resin, 5-10 parts of a coalescing agent, 3-8 parts of butyraldehyde, 10-20 parts of nano titanium dioxide, 8-15 parts of nano tin antimony oxide, 2-5 parts of a polyacrylate dispersant, 2-5 parts of a polyurethane thickener and 15-30 parts of deionized water. Comprising the following steps: S1, weighing deionized water, a polyacrylate dispersing agent and a polyurethane thickening agent according to a ratio, and adding into a stirring kettle; and stirring at the rotating speed of 400rpm for 8 minutes. Through the synergistic effect of the nano titanium dioxide and the nano tin antimony oxide, the anti-ultraviolet, heat-insulating and anti-radiation functions are achieved at the same time, and the problem that an existing glass paint is single in function is solved; the polyacrylate dispersing agent is adopted, so that the dispersity of the nano functional filler is effectively improved, the agglomeration phenomenon is avoided, and the uniformity of the paint film performance is ensured.

The invention relates to the technical field of coatings, in particular to a preparation method of an efficient anti-corrosion material for a flexible support. The component A is prepared from the following materials in parts by weight: 30 to 50 parts of organic silicon epoxy resin, 10 to 20 parts of bisphenol A epoxy resin, 5 to 15 parts of polyvinyl butyral, 5 to 15 parts of zinc phosphate, 5 to 20 parts of hollow ceramic powder, 20 to 30 parts of mixed solvent, 5 to 10 parts of modified powder, 3 to 5 parts of additive, 1 to 3 parts of wetting agent and 0.5 to 1.5 parts of flatting agent. According to the invention, a composite structure is formed by tubular halloysite and rectorite in the modified powder, and a flexible chain segment formed by reaction of a polyurea prepolymer and esterified xylitol in the additive endows the coating with excellent elasticity, so that stress generated by dynamic deformation can be uniformly dispersed, microcrack growth is inhibited, and the wear resistance of the coating is improved. And the anti-corrosion material can keep the structural integrity when bearing the dynamic deformation of the flexible bracket, so that the flexibility of the material is improved.

This invention relates to the field of polymer material synthesis technology, specifically to a modified PVB resin and its preparation method. The invention introduces a fluorinated acetal monoaldehyde derivative containing fluorine into the PVB resin. This derivative is mixed with n-butyraldehyde and glyoxal, thereby undergoing an acetalization reaction with the 1,3-o-diol structure of the PVB molecular chain, incorporating the fluorinated side link into the PVB molecular chain. Utilizing the high electronegativity and high C-F bond energy of fluorine atoms, it shields against the intrusion of external corrosive media, inhibits oxidative yellowing, and improves weather resistance. Furthermore, the invention introduces glyoxal as a crosslinking agent, containing dialdehyde groups, which can react between adjacent polyvinyl alcohol segments, causing slight crosslinking between the originally linear PVB resin segments, improving the resin's shielding performance, further reducing the intrusion of external corrosive media, and enhancing the stability of the PVB resin.

The invention discloses a Pd supported catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The Pd supported catalyst is prepared according to the following steps: dissolving TEOS and MSDS in absolute ethyl alcohol, stirring, adjusting the pH value, aging at room temperature, and drying to obtain a mixture; and extruding the mixture into a long strip shape, calcining to prepare a TiO2-SiO2 composite carrier, dipping the TiO2-SiO2 composite carrier in a palladium nanoparticle solution, filtering, washing, and drying in vacuum to obtain the catalyst. The preparation method is simple and green in process, the reaction process is safe and easy to control, the prepared Pd supported catalyst is good in crystallization, high-dispersion nano-particle morphology, uniform in size and uniform in dispersion, and when the Pd supported catalyst is applied to co-production of methyl isobutyl ketone and methyl isoamyl ketone from mixed aldehyde and ketone, the isobutyraldehyde conversion rate can be effectively increased, and the yield of methyl isobutyl ketone and methyl isoamyl ketone can be effectively increased. The selectivity on methyl isoamyl ketone is good, and organic impurities in the product are few.

This application discloses an acetaldehyde recovery device and method in the production of 1,3-butanediol, belonging to the field of fine chemicals. The device includes: a feed pump, a preheater, a distillation column, a falling film reboiler, a bottom circulating pump, a bottom cooler, a top primary condenser, a reflux ratio distributor, a top secondary condenser, a top product tank, a top transfer tank, a bottom product tank, a bottom transfer tank, a vacuum condenser, a vacuum pump inlet separator, a high vacuum unit, and a vacuum pump outlet separator. The horizontal condenser is directly installed at the top of the distillation column, giving it advantages such as simple structure, convenient operation, low pipeline loss, and high vacuum. A method for acetaldehyde recovery in the production of 1,3-butanediol using this device is also disclosed. Compared to existing technologies, this invention uses falling film evaporation combined with vacuum deep cooling, which avoids the thermal decomposition of 3-hydroxybutyraldehyde and achieves low-temperature, high-efficiency acetaldehyde recovery. It is suitable for continuous production.

The present application relates to the technical field of alcohol aldehyde condensation reaction, and discloses an alcohol aldehyde condensation reaction method.The alcohol aldehyde condensation reaction method is carried out in an alcohol aldehyde condensation reaction device, the alcohol aldehyde condensation reaction device comprises a micro-channel alcohol aldehyde condensation reactor and an alcohol aldehyde condensation tube reactor which are connected in series; in the presence of an alkali catalyst, a reaction raw material n-butyl aldehyde is subjected to a first alcohol aldehyde condensation reaction in the micro-channel alcohol aldehyde condensation reactor to obtain a first alcohol aldehyde condensation reaction product; and the first alcohol aldehyde condensation reaction product is subjected to a second alcohol aldehyde condensation reaction in the alcohol aldehyde condensation tube reactor.The method uses a micro-channel alcohol aldehyde condensation reactor and an alcohol aldehyde condensation tube reactor to replace a full-mixing kettle reactor in the prior art to carry out alcohol aldehyde condensation reaction, so that the yield of a by-product heavy carbon alcohol can be significantly reduced, and the yield of a target product can be improved.

The invention discloses a bending-resistant high-modulus cover film and a preparation method thereof, and particularly relates to the technical field of cover films, the bending-resistant high-modulus cover film comprises an adhesive film and release paper, the adhesive film comprises a film base material and an adhesive-containing bonding layer arranged on the lower surface of the film base material; the release paper is pressed on the bonding layer; wherein the adhesive is prepared from the following components in percentage by mass: 5 to 20 percent of bisphenol A type epoxy resin, 30 to 50 percent of polyvinyl butyral resin, 10 to 20 percent of organic silicon modified epoxy resin, 6 to 10 percent of modified nano silicon dioxide, 10 to 30 percent of flame retardant and 3.1 to 6.5 percent of additive. The covering film has higher glass transition temperature (Tg) and high bending resistance, can maintain the stability of the material, and reduces the plastic deformation caused by repeated bending; the invention also provides a preparation method of the high-modulus cover film.

The present application relates to the technical field of electrochromic, and more particularly to a high-hydroxyl polyvinyl acetal flame-retardant interlayer for electrochromic soundproof glass, and a preparation method thereof.The preparation process comprises the following steps: adding polyvinyl butyral with low acetalization degree into N,N-dimethylformamide, heating and stirring to dissolve, then adding plasticizer and electrolyte salt in sequence, heating and stirring to dissolve, pouring into a mold, vacuumizing to remove bubbles, and heating to remove solvent, thereby obtaining the flame-retardant interlayer.The present application solves the problems of liquid leakage, easy volatilization and safety hazards of the existing liquid reversible metal electrodeposition electrochromic device.

[Problem] To provide a means capable of more efficiently exerting an antibacterial effect against bacteria. [Solution] An antibacterial agent containing at least two compounds selected from the group consisting of trans-2-methyl-2-pentenal, 2-methylbutanal, trans-2-hexenal, propionaldehyde, 3-methylpentanol, and 2,5-dimethylfuran.

This invention belongs to the field of homogeneous catalysis technology, and particularly relates to a method for the hydroformylation of propylene to prepare isobutyraldehyde. The method includes: in the presence of a bidentate P-N ligand and a rhodium metal compound, introducing propylene and syngas to carry out a hydroformylation reaction to prepare isobutyraldehyde. The structural formula of the bidentate P-N ligand is as follows: [Insert structural formula here]. Wherein, R1 is selected from one of C2-C4 alkyl groups, substituted or unsubstituted phenyl groups; R2 is selected from one of hydrogen, C1-C4 alkyl groups, alkoxy groups, substituted or unsubstituted phenyl groups. This method provides a highly active P-N ligand, which, while reducing the amount of rhodium catalyst, maintains high activity and can significantly improve the conversion rate of propylene, as well as the selectivity and yield of isobutyraldehyde.

The invention relates to the technical field of polyvinyl butyral modified materials, and discloses a modified PVB (polyvinyl butyral) material based on nano-silica and a preparation method thereof, the modified PVB material is prepared from the following raw materials by weight: 100 parts of polyvinyl butyral resin; 25 to 45 parts of triethylene glycol di-2-ethylhexoate; 0.5 to 5.0 parts of nano silicon dioxide; 0.05 to 0.50 part of a titanate coupling agent; 0.02 to 0.15 part of magnesium stearate; and 1.0 to 5.0 parts of epoxidized soybean oil. The method comprises the following steps: dispersing silicon dioxide by a plasticizer, dehydrating, adding a coupling agent for in-situ grafting, and compounding a stabilizer to prepare mother liquor; infiltrating the mother liquor into the resin to obtain a swelling material; and performing temperature-controlled extrusion. The modified PVB material based on nano silicon dioxide prepared by the invention solves the problems of particle agglomeration and yellowing, and has high transparency, high strength and excellent heat aging resistance.

The application relates to the technical field of solar cells, in particular to a two-component organic carrier and a preparation method and application thereof, the organic carrier comprises A component and B component, preparation raw materials of the A component comprise a first resin base, a first solvent, a first thixotropic agent and a first auxiliary agent; preparation raw materials of the B component comprise a second resin base, a second solvent, a second thixotropic agent and a second auxiliary agent; preparation raw materials of the first resin base comprise polyvinyl butyral resin and first cellulose; and preparation raw materials of the second resin base comprise polyvinyl butyral resin and second cellulose. The prepared organic carrier is tested, the single consumption range of the organic carrier can be controlled within 20%, with the decrease of the single consumption, the machine welding tension and the aging tension are both stabilized above 3N, and the requirements of the reliability of the tension of the crystalline silicon solar cell piece can be met.

The application relates to the technical field of ceramic cutter production, and particularly discloses a high-strength ceramic cutter production process, which comprises the following steps: S1, whisker directional pretreatment; S2, ceramic base body mixing; S3, binder preparation: polyvinyl butyral is dissolved in anhydrous ethanol to form a solution, titanium ester coupling agent NDZ-201 is added, constant-temperature stirring is carried out until the solution is transparent and uniform, and a composite binder is obtained; S4, freeze-drying granulation: mixed powder and the composite binder are mixed, anhydrous ethanol is added, slurry is formed after stirring, the slurry is injected into a mold, freezing is carried out, drying is carried out in a freeze dryer, and the granulation powder is obtained by crushing and sieving; S5, gradient hot-pressing sintering: the granulation powder is loaded into a graphite mold and sintered in a vacuum hot-pressing furnace; and S6, laser surface strengthening: the sintered body is placed on a pulse laser processing platform, and a laser is used to perform laser cladding treatment on the cutter edge area.

A tackified ceramic fabric sheet includes a pre-preg layer having a fabric of woven ceramic tows and a tackifier compound surrounding the tows and comprising 15% to 60% polyvinyl butyral with ethanol. The sheet further includes a removable first backing film layer on a first side of the pre-preg layer.

The invention provides a resin composition for a cover film and the cover film. The resin composition for the cover film comprises the following components in parts by weight: 40-50 parts of phenoxy resin, 5-10 parts of polyvinyl butyral resin, 15-20 parts of epoxy resin, 5-10 parts of methacrylate-butadiene-styrene core-shell rubber and 5-20 parts of a curing agent, wherein the curing agent comprises an isocyanate curing agent and an amine curing agent. The covering film comprises a base film, an adhesive layer and a protective layer which are sequentially arranged in a stacked mode. The adhesive layer is prepared from the resin composition for the cover film. By designing the specific composition of the resin composition, the resin composition with high glass transition temperature, excellent processability and high reliability is obtained, the prepared cover film has good heat resistance, and the problems of curling of the cover film and adhesive falling during paper tearing are solved.

The utility model relates to the technical field of chemical liquid dropwise adding, and discloses a high-precision n-butyraldehyde dropwise adding and dynamic flow adjusting system which comprises a raw material storage tank, a dropwise adding tank, a dropwise adding control unit, a flow adjusting and feedback unit, an automatic control module and a sensing monitoring module. The input end of the main pump is communicated with the interior of the raw material storage tank, the output end of the main pump is communicated with a main feeding tank, the input end of the auxiliary pump is communicated with the interior of the raw material storage tank, the output end of the auxiliary pump is communicated with an adjusting pipeline, and proportioning valves are installed outside the adjusting pipeline and the main feeding pipeline. According to the system, the double-pump flow dividing device is adopted, precise feeding and intelligent control are combined, efficient, stable and automatic material feeding is achieved in the PVB resin powder production process, the quality and efficiency of the production process are remarkably improved, and the system has wide industrial application value.

The invention discloses a high-temperature-resistant anticorrosive primer suitable for steelmaking equipment. The primer consists of the following components: tetraethoxysilane, acrylic resin, a coupling agent and a diluent. According to the primer, the acrylic resin is used for replacing conventional polyvinyl butyral, the acrylic resin is used as a plasticizer of zinc powder, and the coupling agent is added, so that the technical problems that the inorganic zinc silicate heat-resistant primer in the prior art cannot be thickly coated, is poor in adhesive force after being thickly coated, is easy to crack during being thickly coated, is poor in toughness, is easy to damage during transportation and is poor in impact are solved.

The invention discloses a method for treating butyraldehyde-containing wastewater. The method comprises the following steps: introducing butyraldehyde-containing wastewater with a pH value of 6-9 into an anaerobic fluidized bed membrane bioreactor, adding a porous microbial carrier filler into the anaerobic fluidized bed membrane bioreactor, and adding a microbial composite strain into the anaerobic fluidized bed membrane bioreactor, loading the microbial composite strain onto the porous microbial carrier filler, and carrying out anaerobic treatment in the anaerobic fluidized bed membrane bioreactor under a stirring condition to obtain treated wastewater; the porous microbial carrier filler is a hydrophilic filler; the drying density of the porous microbial carrier filler is 20-80g / L, the density after water absorption is 1.02-1.08 kg / L, and the specific surface area is greater than or equal to 10000 m < 2 > / m; the concentration of butyraldehyde in the treated wastewater is less than or equal to 20mg / L. The method not only can be used for directly carrying out biochemical treatment on the wastewater containing high-concentration butyraldehyde (the concentration of butyraldehyde is greater than 100mg / L), but also can be efficiently and stably operated.

This invention provides the application of compounds in attracting or controlling midges, relating to the field of midge control technology. Through screening and identification, this invention has obtained five compounds (butyric acid, butyraldehyde, propionaldehyde, 2-hexanone, and acetophenone) with significant attractant activity against Formosan midge. These compounds can be used alone or in combination, are environmentally friendly and have a high affinity for non-target organisms, greatly enriching the candidate resource of midge attractants. They can be directly applied to the monitoring and large-scale trapping of midges, effectively reducing midge population density, thereby reducing midge bites and the spread of midge-borne diseases, which has significant public health implications.

The present invention relates to a film laminate, a smart window comprising the same, and a method for manufacturing the same, the film laminate being characterized by comprising a light-dimming laminate and a surface protective layer laminated on at least one of the upper surface and the lower surface of the light-dimming laminate, the surface protective layer is a low-temperature curable polyvinyl butyral (PVB) film that is cured at a temperature of 90 DEG C or less, has a thickness of 0.01-0.35 mm, and has a larger overall area than the area of the light-dimming laminate in contact with the surface protective layer. According to the present invention, it is possible to manufacture a film laminate which minimizes the pressure applied to a liquid crystal layer during glass bonding and does not cause liquid crystal displacement, thereby preventing the occurrence of liquid crystal speckles and having an excellent appearance.

The embodiment of the invention provides a preparation method of a wave-absorbing and heat-dissipating film and the wave-absorbing and heat-dissipating film. The preparation method comprises the following steps: carrying out amination modification on Ti < 3 > C < 2 > T < x > powder to obtain NH < 2 >-Ti < 3 > C < 2 > T < x > powder; the preparation method comprises the following steps: carrying out carboxylation modification on the Fe3O4 nano particles to obtain the Fe3O4-COOH particles. And mixing the NH2-Ti3C2Tx powder with the Fe3O4-COOH particles, and carrying out an amidation condensation reaction, so as to obtain the Ti3C2Tx-Fe3O4 complex. The preparation method comprises the following steps: dissolving polyvinyl butyral in ethanol, and stirring and mixing to obtain a precursor solution; adding the Ti3C2Tx-Fe3O4 complex and hexagonal boron nitride powder into the precursor solution, and stirring and dispersing to obtain a composite glue solution; and coating a substrate with the composite glue solution, drying, curing, and stripping from the substrate to obtain the wave-absorbing and heat-dissipating film. Multiple interfaces exist between Ti3C2Tx-Fe3O4 and h-BN, electromagnetic waves are reflected and scattered for multiple times between the interfaces with different dielectric constants, and the electromagnetic waves are fully lost. H-BN cooperates with Ti3C2Tx-Fe3O4 to jointly form a stable heat conduction channel, so that heat is rapidly conducted to the surface of the wave-absorbing heat dissipation film from a heat source and dissipated, and the situation of local overheating is reduced.

The invention discloses a preparation method and application of a 2, 5-diketopiperazine derivative, and belongs to the field of biological medicine. The preparation method comprises the following steps: by taking 1, 4-diacetyl piperazine-2, 5-diketone (II) as an initial raw material, firstly, carrying out condensation reaction on the initial raw material and isobutyraldehyde to prepare a key intermediate (III); meanwhile, 4-amino-1-butanol (IV) is converted into an intermediate (VI) through acylation and oxidation two-step reaction; and finally, carrying out condensation and elimination reaction on the intermediates (III) and VI to prepare the target compound (I). The preparation method provided by the invention has the advantages of reasonable route design, mild conditions and outstanding stereoselectivity. According to the method, on the basis of easily available raw materials, a product mainly comprising a Z configuration is efficiently constructed through a modular strategy and consistent mild base catalysis conditions. Experimental data show that the compound prepared by the invention can inhibit TG accumulation in nematode bodies and reduce nematode fat accumulation, and can be developed into efficient medicines for preventing and treating obesity.