68 results about "Cyclobutene" patented technology

The invention belongs to the technical field of chemical engineering, particularly relates to a preparation method and a preparation device of electronic-grade hexafluorobutadiene, and aims to provide a brand-new hexafluorobutadiene synthesis route which can fundamentally solve the bottleneck problem in the existing hexafluorobutadiene production or preparation method. According to the preparation method, chlorotrifluoroethylene is taken as a main raw material, and the electronic grade 4N hexafluorobutadiene meeting the application of the semiconductor industry is prepared through two steps of catalytic polymerization and finished product rectification. The process raw materials and the device are high in utilization rate, impurities such as heptafluorobutene and hexafluorocyclobutene which are difficult to purify do not exist, the quality of the produced finished product can be effectively guaranteed under the condition that the cost is low, and then the technology is more competitive.

The invention relates to a preparation method of octafluorocyclobutane, which comprises the following steps: mixing hexafluorocyclobutene with preheated nitrogen trifluoride, carrying out addition reaction on the mixed gas, and condensing and collecting the octafluorocyclobutane after the reaction is completed. According to the method, octafluorocyclobutane is prepared by using nitrogen trifluoride, continuous production of octafluorocyclobutane with the purity being 99 wt% or above can be achieved, the preparation method has the advantages of being low in raw material cost, simple in process, low in energy consumption, simple in product separation, good in selectivity and convenient to purify, and amplified continuous production can be achieved easily.

The application relates to a preparation method of BOPP waste discharge adhesive tape and belongs to the technical field of adhesive tape. BOPP raw materials, an anti-blocking agent and color master batch are uniformly stirred and mixed, then are sent into an extruder for extrusion and chilling forming; the formed adhesive tape is longitudinally stretched, transversely stretched, pulled, subjected to surface corona treatment, wound, subjected to aging treatment, cut and packaged to obtain the BOPP waste discharge adhesive tape; the anti-blocking agent is prepared through polymerization reaction, centrifugal separation and drying by using a methacrylate, a methallyl nickel chloride dimer, 4-vinylbenzocyclobutene, a mercapto-beta-cyclodextrin and an initiator; the prepared BOPP waste discharge adhesive tape has excellent mechanical properties, low light transmittance and good light shielding performance.

The present application relates to a kind of conjugated microporous polymer, film and its preparation and application, the present application is respectively introduced 1,3,5-tri (4-aminophenyl) benzene, 2,4,6-tri (4-aminophenyl) -1,3,5-triazine or tri (4-aminophenyl) amine on the basis of 3,4-dihydroxy-3-cyclobutene-1,2-diketone, powder polymer is prepared, then through electroblasting technology obtains conjugated microporous polymer film.The conjugated microporous polymer film prepared by the present application realizes the detection of NO2 at room temperature, its preparation method is green and simple, low in price, overcomes the problem that conjugated microporous polymer is difficult to process, has good sensing application prospect.

This invention belongs to the field of solid-state electrolyte technology, specifically relating to a high-pressure resistant composite polymer solid-state electrolyte, its preparation method, and its application. The solid-state electrolyte comprises: a high-pressure resistant terpolymer, a PVDF-based polymer, mullite filler, and a lithium salt; the high-pressure resistant terpolymer is prepared from a high-pressure resistant additive, a crosslinking agent, ethylene ethylene carbonate monomer, and an initiator; the high-pressure resistant additive is selected from at least one of propylene-1,3-sulfonyl lactone, cyclobutene sulfone, and 3-methyl-3-cyclobutene sulfone. The preparation method is as follows: the high-pressure resistant additive, crosslinking agent, initiator, lithium salt, and ethylene ethylene carbonate monomer are mixed to obtain a precursor solution; the PVDF-based polymer and mullite filler are stirred and mixed in a solvent, coated into a film, and vacuum dried to obtain a base film; the base film is immersed in the precursor solution, and after immersion, it is cured to obtain the high-pressure resistant composite polymer solid-state electrolyte.

The invention belongs to the field of aviation composite material manufacturing, and particularly relates to a preparation method of a benzocyclobutene modified cyanate ester composite material. Common high-temperature-resistant resin cannot have the characteristics of low dielectric, low loss, high temperature resistance and thermal oxidative aging resistance at the same time. The preparation method comprises the following steps: adding chloroplatinic acid with the mass fraction of 1%-5% into a benzocyclobutene monomer, and carrying out prepolymerization to obtain a benzocyclobutene prepolymer with the viscosity of 500-1000 mpas; the preparation method comprises the following steps: carrying out copolymerization on a benzocyclobutene prepolymer and cyanate ester according to a molar ratio of (1: 9)-(1: 1) to obtain a benzocyclobutene modified cyanate ester copolymer with the viscosity of 5000mpas-20000mpas; coating the release paper with the modified cyanate ester copolymer by using a hot melting method prepreg machine, wherein the coating temperature is 50-100 DEG C; then the benzocyclobutene modified phenolic aldehyde type cyanate ester prepreg is obtained through compounding with a fiber fabric, the compounding temperature is 50-100 DEG C, and the glue content of the prepreg is 33%-43%; and laminating and curing a certain number of layers of prepreg according to the thickness. The high temperature resistance and thermo-oxidative aging resistance of the cyanate ester resin can be improved, and the characteristics of low dielectric constant and low loss of the cyanate ester resin are maintained. The requirements of the high-temperature-resistant thermo-oxidative-aging-resistant wave-transparent resin-based composite material for the radome are met.

The invention relates to the technical field of high-frequency and high-speed substrate resin and packaging materials of microelectronic devices, and particularly discloses hydrocarbon resin of dibenzocyclobutene fluorene and derivatives thereof and a preparation method of the hydrocarbon resin, and the hydrocarbon resin is prepared by mixing 9, 9-disubstituent-9H-fluorene and / or the dibenzocyclobutene fluorene derivatives according to a specific proportion, adding a solvent, and stirring to obtain the hydrocarbon resin of the dibenzocyclobutene fluorene and the derivatives of the dibenzocyclobutene fluorene and the derivatives of the dibenzocyclobutene fluorene. And carrying out a thermocuring reaction to obtain the product. The dibenzocyclobutene fluorene derivative is prepared by carrying out Heck reaction on 9, 9-disubstituent-9H-fluorene and halogenated benzocyclobutene under the catalysis of a base catalyst and a modified palladium catalyst, the prepared hydrocarbon resin has very low dielectric constant and dielectric loss and higher softening point and peel strength, and can better meet market requirements.

A photoalignable polymeric material for forming a liquid crystal alignment film comprises repeating units represented by formula (I), (I), wherein P1 is a divalent residue of a diamine HN2- Ar1-X1-NH2; and repeating units represented by formula (II), (II), wherein P2 is a divalent residue of a diamine HN2-Ar2-X2-Ar3-NH2; and wherein Q is a tetravalent residue of a cyclobutylene tetracarboxylic dianhydride Further provided is a process for producing the photoalignable polymeric material, a liquid crystal alignment film and a process for forming the film, as well as a liquid crystal alignment film optical device comprising the liquid crystal alignment film. The photoalignable polymeric material minimizes light leakage and improves the dark state of liquid crystal displays.

The invention discloses a preparation method of a substituted cyclobutene compound, which comprises the following specific operations: under the protection of inert gas, dissolving a compound shown as a formula (I) and a compound shown as a formula (II) in an aprotic solvent, adding an organic alkali while stirring, controlling the molar ratio of the compound shown as the formula (I) to the compound shown as the formula (II) to the organic alkali to be 3: 2: 6, and reacting for 2-4 hours; adding an aprotic solvent, reacting for 2-4 hours at the temperature of 0-60 DEG C, then adding water for quenching, filtering, washing, and drying by distillation under reduced pressure to obtain a product (III), then adding methanol, then adding NaBH4, and reducing for 6-12 hours, with the molar ratio of the product (III) to the NaBH4 being 1: 5; and adding water for quenching, filtering, washing, drying by distillation under reduced pressure, and carrying out column chromatography separation to obtain a product (IV). According to the invention, under the condition of no metal catalysis, a series of representative substituted cyclobutene compounds can be obtained through cyclization of a cinnamamide compound raw material which is simple and easy to obtain and a benzhydryl-3-phenylpropyl-2-alkyne-1-imine compound under an alkaline condition.

To provide a laminated adhesive film used in a modified benzocyclobutene-containing FC-BGA-mounted carrier board, a method for manufacturing the same and application.SOLUTION: A laminated adhesive film contains 45 to 100 pts.wt. of an epoxy resin, 40 to 100 pts.wt. of an inorganic filler, 25 to 45 pts.wt. of cyanate ester, 40 to 60 pts.wt. of modified benzocyclobutene, 5 to 10 pts.wt. of an acrylic resin, 5 to 10 pts.wt. of a phenoxide resin, 0.1 to 1 pts.wt. of a solidification accelerator, and 200 to 300 pts.wt. of an organic solvent. The modified benzocyclobutene is one or two of phosphorus-containing benzocyclobutene and nitrogen-containing benzocyclobutene. The performance of the laminated adhesive film is adjusted by further adding modified benzocyclobutene in addition to the epoxy resin, the phenoxide resin, the cyanate ester, and the solidification accelerator. The laminated adhesive film has excellent dielectric characteristics and can reduce dielectric loss, by adding various modified benzocyclobutene and other raw material components. The laminated adhesive film has excellent flame retardant performance, thereby the laminated adhesive film is used in an FC-BGA-mounted carrier board, and can satisfy needs of high-speed and high integration of the electronic component.SELECTED DRAWING: None

The invention discloses a BCB photoresist and a preparation method thereof, and belongs to the technical field of photoresists. Comprising the following raw materials in parts by weight: 60-70 parts of modified BCB resin, 20-30 parts of a solvent, 1-3 parts of anthraquinone-2-sodium sulfonate and 5-9 parts of triallyl isocyanurate. Wherein the modified BCB resin is prepared from the following raw materials: 4-vinyl benzocyclobutene, p-divinyl benzene, an RAFT (Reversible Addition-Fragmentation Chain Transfer) reagent and an anti-impact modifier, and the anti-impact modifier not only improves the impact resistance of the cured photoresist, but also has photosensitivity and broadens the ultraviolet response range; sodium anthraquinone-2-sulfonate is added into the raw materials of the BCB photoresist as a nano sensitizer, so that the ultraviolet absorption is further enhanced, and the developing contrast is improved; in conclusion, the photoresist prepared by the invention has both impact resistance and photosensitivity, is stable in performance, and has important application value in the technical field of photoresist.

The present invention relates to a process for producing trifluoroethylene in a reactor provided with a fixed catalytic bed comprising a catalyst, said process comprising a step a) of reacting a composition A comprising chlorotrifluoroethylene with hydrogen in the presence of a catalyst and in the gas phase to produce a stream B comprising trifluoroethylene, characterized in that said composition A also comprises at least one of the additional compounds C1 chosen from the group consisting of 1,1,1-trifluoroethane, 1,1,1,2-tetrafluoroethane, hexafluorocyclobutene, fluoroethane, 2-chloro-1,1,1-trifluoroethane, 1,2-dichlorohexafluorocyclobutane. The present invention also relates to a chlorotrifluoroethylene composition.

The application discloses a preparation of a thermosetting benzocyclobutene-based MQ silicone resin and application thereof in preparing a glass fiber composite material, and comprises the following steps: stirring and reacting an organic silicon source, a solvent, a catalyst and water at 30-50 DEG C for 30-90 min to form a mixed solution A; uniformly mixing divinylsiloxane-benzocyclobutene and the solvent to form a mixed solution B, adding the mixed solution B into the mixed solution A, and heating to 65-80 DEG C for 1-3 h; adding an organic phase after the reaction is completed, washing with water for several times until neutral, removing the solvent by vacuum distillation, and vacuum drying; and obtaining the thermosetting benzocyclobutene-based MQ silicone resin. The thermosetting benzocyclobutene-based MQ silicone resin has excellent dielectric properties, mechanical properties, heat resistance and chemical stability, and the cured resin formed by thermal crosslinking has the properties of low dielectric, high tensile strength, high bending strength, chemical stability and heat resistance.

The application belongs to the technical field of dielectric material monomer synthesis, and discloses a preparation method of 1-methylbenzocyclobutene. The application adopts 1-hydroxybenzocyclobutene as raw material, and reacts with p-toluenesulfonyl chloride (TsCl) to generate 1-p-toluenesulfonyloxybenzocyclobutene. Then, the 1-p-toluenesulfonyloxybenzocyclobutene reacts with methylmagnesium chloride under the action of a catalyst to obtain the target product 1-methylbenzocyclobutene. The target product is synthesized under relatively mild conditions mainly by controlling the reaction temperature, the feeding sequence and the feeding ratio. The process operation is simple, the experimental condition is mild, the product yield is high, and the method is suitable for industrial production.

The invention discloses a synthesis method of a high-purity benzocyclobutenyl organosilicone monomer for semiconductor packaging resin, which specifically comprises the following steps: by taking vinyl silane and 4-bromobenzocyclobutene as reaction raw materials, firstly preparing benzocyclobutene-vinyl silane through Heck reaction, and then preparing benzocyclobutene-vinyl silane by taking a Meerwein reagent as a medium and potassium carbonate as an additive, thereby obtaining the high-purity benzocyclobutenyl organosilicone monomer for semiconductor packaging resin. And carrying out mild reaction in a polar aprotic solvent to directly prepare the high-purity benzocyclobutene organic silicon monomer tetramethyl divinyl siloxane dibenzocyclobutene. Compared with the traditional preparation method, the method has the advantages of wide reaction raw material source, low price, few reaction steps and high yield in synthesis, and the reaction is beneficial to the high purification process of the monomer, so that the method is more suitable for industrial batch production.

The invention relates to the field of low dielectric materials, and provides a benzocyclobutene modified acenaphthene derivative as well as a preparation method and application thereof. At least one substituent group on an acenaphthene ring in the molecular structure of the benzocyclobutene modified acenaphthene derivative provided by the invention comprises a BCB group. The benzocyclobutene modified acenaphthene derivative is prepared by carrying out coupling reaction on acenaphthene and / or an acenaphthene derivative and a benzocyclobutene derivative. The benzocyclobutene modified acenaphthene derivative has a total hydrocarbon structure, resin prepared by taking the benzocyclobutene modified acenaphthene derivative as a raw material has lower dielectric constant and dielectric loss when being used for a photoelectric material and has excellent thermal stability, and the performance of the acenaphthene derivative is regulated by regulating substituent groups on an acenaphthene ring; and the application in the fields of high-performance PCBs, packaging and the like can be met.

The application discloses a high-temperature-resistant metalized capacitor film and a preparation method thereof, and belongs to the technical field of thin film or thick film capacitors. The application provides a novel method for preparing a metalized capacitor film, which comprises the following steps: taking 4-vinylbenzocyclobutene as raw material, and combining the raw material with hydrogen bromide after an addition reaction to obtain a substitution product; combining 2-methoxy-4-vinylphenol with the substitution product after demethylation to obtain a polymerization monomer containing a double bond and a cycloalkane structure; polymerizing the polymerization monomer with decafluorobiphenyl and 4-allylphenol to obtain a base film; and plating a metal layer on the base film to obtain the high-temperature-resistant metalized capacitor film. The application has good thermal stability, and solves the technical problem that a thermoplastic base film is deformed or decomposed at high temperature, and is difficult to meet the use requirement.

The present invention relates to a process for producing trifluoroethylene in a reactor equipped with a fixed catalytic bed comprising a catalyst, said process comprising a step a) of reacting a composition A comprising chlorotrifluoroethylene with hydrogen in the presence of a catalyst and in the gas phase in order to produce a stream B comprising trifluoroethylene, characterized in that said composition A also comprises at least one of the additional compounds C1 chosen from the group consisting of 1,1,1-trifluoroethane, 1,1,1,2-tetrafluoroethane, hexafluorocyclobutene, fluoroethane, 2-chloro-1,1,1-trifluoroethane and 1,2-dichlorohexafluorocyclobutane. The present invention also relates to a chlorotrifluoroethylene composition.

The invention relates to the technical field of preparation of low-dielectric films, and particularly discloses a preparation device and process of a benzocyclobutenyl low-dielectric film. The preparation method comprises the following steps: S1, under the protection of inert gas, mixing a benzocyclobutenyl monomer, a photosensitizer and a specific solvent in proportion, and carrying out ultrasonic stirring to obtain a uniform photosensitive precursor solution A; s2, pretreating the surface of the base material by adopting an atmospheric pressure non-equilibrium plasma technology, and introducing an active functional group to obtain a surface-activated base material B; s3, applying gradient change coating pressure to the base material B, and uniformly coating the photosensitive precursor solution A on the surface of the base material; s4, the coated base material B sequentially passes through multi-stage temperature control drying systems in different temperature areas, and gradient heating is conducted; and S5, in a nitrogen protection atmosphere, performing high-precision curing on the dried base material by adopting an infrared laser heating technology to form the low-dielectric film, so that the influence on the service life and the performance stability of the low-dielectric film is avoided.

The invention relates to the technical field of active resin, in particular to benzocyclobutenyl-terminated active ester resin as well as a preparation method and application thereof. The preparation method of the benzocyclobutenyl-terminated active ester resin comprises the following steps: stirring and mixing an acyl chloride-containing compound, diallyl bisphenol A, a benzocyclobutenyl end-capping reagent and a first organic solvent to obtain a first mixture; dropwise adding an acid-binding agent into the first mixture, and carrying out polymerization reaction to obtain a reaction product; and purifying the reaction product, and removing the first organic solvent to obtain the benzocyclobutenyl-terminated active ester resin. According to the preparation method, through the synergistic effect of flexible chain segment embedding, terminal group polarity adjustment, main chain polarity optimization and molecular weight control, the intermolecular acting force of BMI containing the BCB terminal group is effectively reduced, the compatibility of BMI molecules containing the BCB terminal group and an organic solvent is improved, and therefore the solubility of the BMI molecules is improved.

The present disclosure relates to compositions and methods useful for the functionalization of surfaces in the absence of a metal catalyst. The compositions include compounds of formula (I), which react with strained alkene-containing compounds, before or after molecular assembly catalyzed by tyrosinase, to afford cycloadducts. The strained alkene-containing compound may further comprise any molecule of interest, including small molecules and macromolecules, thereby enabling surface functionalization. In certain embodiments, the strained alkene-containing molecule comprises a moiety selected from the group consisting of a trans-cyclooctene (TCO), cyclopropene, cyclobutene, and norbornene.

The invention relates to a synthesis method of 2-butadiene sulfone. The synthesis method comprises the following steps: mixing a compound I with an alkaline substance, and carrying out elimination reaction to obtain the 2-butadiene sulfone. According to the method, 3-substituted sulfolane is simply stirred in an alkaline substance for elimination reaction, and then simple separation and extraction are carried out, so that 2-sulfolane can be conveniently prepared. The method is simple to operate, has high selectivity, can specifically generate the target product 2-butadiene sulfone, and does not generate a byproduct 3-butadiene sulfone, so that the synthesis yield and the purification efficiency are greatly improved. The synthesis method of 2-butadiene sulfone provided by the invention has the characteristics of simple and convenient synthesis conditions, high selectivity, high yield and high purity.

The application discloses a preparation method of a nickel-containing metal organic framework material and application of the material to an oxygen evolution material in an electrocatalytic water decomposition process, and particularly relates to a novel chromium-nickel heterometallic organic framework material obtained by self-assembly in a mixed solution of an organic ligand 3,4-dihydroxy-3-cyclobutene-1,2-diketone, nickel nitrate hexahydrate, chromium nitrate nonahydrate, sodium hydroxide and deionized water. The synthesized material is assembled into a three-electrode system and is used as a catalyst material for an oxygen evolution reaction to test the electrocatalytic performance. The metal organic framework material has the advantages that the ligand used in the material has low cost, simple synthesis process and high purity; the oxygen affinity of Cr and the synergistic effect of Ni are utilized to increase active sites and optimize and improve the electrocatalytic performance of the material. Through analysis of the experimental test data, it is found that the Cr 0.17 The Ni-MOF material has superior electrocatalytic oxygen evolution performance, and the overpotential is only 175 mv at 10 mA·cm ‑2 , which is superior to other proportions of chromium-doped metal organic framework materials.

The invention discloses a crosslinkable hole transport polymer and application thereof in preparation of a photoelectric device. The polymer has a triarylamine unit, and a group with chemical reaction activity is introduced to a side chain of the polymer; chemically reactive groups of styrene, benzocyclobutene and substituents or derivatives thereof; the cross-linkable hole transport polymer can be cross-linked and cured under the mild conditions of heat, light, an initiator and the like, and then has good solvent resistance, another layer of film can be prepared on the cross-linkable hole transport polymer through solution processing, and a multi-layer solution processing device is achieved. The cross-linkable hole transport polymer also has high optical transparency, has large potential as a hole transport polymer, and can realize different energy levels and carrier mobility by adjusting the content of a polymerization unit. The method can be used for preparing the hole injection layer of the photoelectric device.

The invention relates to the technical field of graded pore materials, in particular to a graded pore preparation method of a UTSA-280 material, the UTSA-280 material with a graded pore structure and application of the UTSA-280 material. The preparation method comprises the following steps: contacting a first dispersion liquid containing a calcium source and a first dispersing agent with a second dispersion liquid containing 3, 4-dihydroxy-3-cyclobutene-1, 2-diketone, alkali and a second dispersing agent, and reacting to obtain the UTSA-280 material with a hierarchical pore structure, wherein the reaction temperature is-10 DEG C to 15 DEG C. The UTSA-280 material provided by the invention has developed mesoporous and macroporous structures on the premise of retaining the original microporous structure, the mass transfer rate of adsorbate is remarkably improved, and the UTSA-280 material has good adsorption separation performance; when the UTSA-280 material is used for gas adsorption separation, the gas adsorption capacity is improved, and meanwhile, the separation factor is increased.

The application belongs to the field of organic chemistry and provides a 1,3-dithiane substituted cyclobutene derivative and a preparation method and application thereof. That is, with acetylenic thiane compound and cinnamate compound as raw materials, intermolecular cycloaddition occurs under the promotion of a base to obtain. And through negative ion relay chemistry, a more complex cyclobutene can be obtained. The structural feature is that it has a structure shown in formula (I), wherein R 1 , R 2 is aryl; R 3 is alkyl or aryl; X = oxygen (O) or sulfur (S); and E is hydrogen, alkyl or aryl. The method provided by the application uses a cheap strong base as a promoter, avoids using a noble metal catalyst, has mild reaction conditions, simple operation, wide substrate applicability, does not need anhydrous and oxygen-free operation, has strong practicability and a prospect of industrial application. The method provided by the application can be used for synthesis and later modification of natural products, drug molecules and functional material molecules.

The present invention provides a compound of formula (I) or a racemate or stereoisomer thereof, a pharmaceutically acceptable salt thereof, or a solvate of the compound of formula (I). The compound has good CCR6 inhibitory activity and better selectivity than CXCR2, while possessing excellent pharmacokinetics and pharmacodynamics.

The invention provides a benzo ring type carbon dioxide-philic microsphere as well as a preparation method and application thereof. The preparation method of the benzo ring type carbon dioxide-philic microspheres comprises the following steps: mixing acrylamide, a benzo ring monomer, a propanesulfonic acid monomer and a cross-linking agent, and carrying out polymerization reaction under the action of an initiator; wherein the benzoring monomer comprises one or a combination of more than two of 4-vinyl benzocyclobutene, benzoazetidine, benzoxetane, benzothietane, 2, 3-indoline, 2, 3-dihydrobenzofuran and 2, 3-dihydrobenzothiophene, and the benzoring monomer comprises one or a combination of more than two of 4-vinyl benzocyclobutene, benzoazetidine, benzoxetane, benzothietane, 2, 3-indoline, 2, 3-dihydrobenzofuran and 2, 3-dihydrobenzothiophene. The mass ratio of the acrylamide to the benzo ring monomer to the propanesulfonic acid monomer is (5-20): (0.08-0.8): (0.4-1.6); the temperature of the polymerization reaction is 30-55 DEG C, and the time is 6-10 hours. The microsphere material can form a high-strength three-dimensional network, and in-situ physical plugging of a gas channeling channel is achieved.

The invention discloses a resin composition and a product thereof, the resin composition comprises a vinyl-containing resin and a phosphorus-containing copolymer, and the phosphorus-containing copolymer is prepared by copolymerization of a mixture. The mixture comprises vinyl benzocyclobutene with a structure as shown in a formula (1) and a phosphorus-containing compound with a structure as shown in a formula (2). The resin composition can be made into various products, including resin films, prepregs, laminates or printed circuit boards, and is improved in one or more of dielectric loss, tensile force to copper foil, flame resistance, X-axis thermal expansion coefficient and other characteristics.

The invention provides a method for continuously preparing hexafluorobutadiene in a gas phase, which comprises the following steps: by taking chlorotrifluoroethylene as an initial raw material, carrying out a gas-phase catalytic telomerization reaction to obtain an intermediate 1, 2-dichlorohexafluorocyclobutane, then carrying out a gas-phase catalytic dichloro-removal reaction to obtain an intermediate hexafluorocyclobutene, and finally, carrying out a gas-phase catalytic telomerization reaction to obtain the hexafluorobutadiene. And finally, carrying out gas-phase catalytic isomerization reaction to obtain the target product hexafluorobutadiene. The method for synthesizing hexafluorobutadiene has the advantages of high one-way yield, high selectivity, short reaction time, easy realization of gas phase independent circulation continuous reaction, and high synthesis efficiency.