80 results about "Polyetherketoneketone" patented technology

The invention discloses a polyetherketoneketone high-temperature-resistant wear-resistant non-stick coating and a preparation method thereof. The coating is prepared from the following components in parts by mass: 13 to 30 parts of a resin matrix group (containing 12 to 25 parts of titanium modified polyether ketone ketone resin, 1 to 5 parts of fluorine-free viscous resin and 0.65 to 6 parts of aluminum oxide), 0.5 to 3 parts of a nano reinforced group (containing 0.5 to 3 parts of KH-550 modified nano titanium dioxide, 0.025 to 0.6 part of cerium dioxide and 0.5 to 3 parts of boron nitride) and 62 to 71 parts of an auxiliary agent group. The preparation method comprises the following steps: 1) taking diphenyl ether, paraphthaloyl chloride and isophthaloyl chloride as monomers, and synthesizing titanium modified polyether ketone ketone resins with different viscosities through segmented polymerization (1.5-2.0 hours or 3.0-4.0 hours); 2) respectively preparing a smooth bottom layer water dispersion slurry and a wrinkled surface layer water dispersion slurry; and (3) forming a compact bottom layer and a micro-wrinkle surface layer on the base material by adopting a layered spraying and stepped sintering process (280-320 DEG C, 10-20 minutes). The whole system of the coating is fluorine-free and has temperature resistance gt; the coating has the characteristics of high temperature resistance (350DEG C), wear resistance (Taber wear rate of 3-5mg / 1000r), non-sticking (contact angle gt, 100 DEG C) and heavy corrosion resistance, and is suitable for cooking utensils and chemical equipment.

The invention discloses a high-toughness polyetherketoneketone polymer and a preparation method thereof, and belongs to the technical field of macromolecular special engineering plastics. The high-toughness polyether ketone ketone polymer is obtained by reacting diphenyl ether, paraphthaloyl chloride, a compound 1 and anhydrous aluminum trichloride according to a molar ratio of 1: a: (1-a): (3-5), the value of a is 0.5-0.9, and the compound 1 is isophthaloyl chloride with a flexible polyether side chain. According to the high-toughness PEKK polymer disclosed by the invention, a flexible polyether side chain is introduced into a rigid polymer main chain, so that compared with a traditional PEKK polymer molecule with a pure rigid structure, the high-toughness PEKK polymer shows better flexibility, and harmony and unification of strength, rigidity and flexibility are realized.

The synthesis process comprises the following steps: (1) introducing inert gas into a reactor, adding a solvent, a Lewis acid catalyst and diphenyl ether, then dropwise adding an acyl chloride monomer solution, and synthesizing an intermediate M with a short-chain small molecular structure; (2) continuously dropwise adding an acyl chloride monomer solution into the reactor for reaction, and then adding an end-capping reagent for reaction; and (3) quenching, washing and drying the reaction product in the step (2) to obtain the product. Under the condition that only the Lewis acid is used as the catalyst, the one-pot method is adopted for synthesizing PEKK in two steps, side reactions can be reduced, meanwhile, the dosage of the catalyst is reduced, the production cost is reduced, the post-treatment process is simplified, and the obtained polyether ketone ketone is high in molecular weight and good in heat resistance and mechanical performance.

A process for manufacturing a polyether ketone ketone, involving: placing an aromatic ether or a mixture of aromatic ethers, including at least 50 mol % of 1,3-bis(4-phenoxybenzoyl)benzene, 1,4-bis(4-phenoxybenzoyl)benzene or a mixture thereof, relative to the total number of moles of aromatic ether(s), in contact with an acyl chloride or a mixture of acyl chlorides, and a Lewis acid, in all or part of a reaction solvent, so as to form a reaction mixture, the 1,3-bis(4-phenoxybenzoyl)benzene and / or 1,4-bis(4-phenoxybenzoyl)benzene essentially not being dissolved in the reaction solvent at the end of the step of placing in contact; and, polymerizing the reaction mixture, the polymerization being performed, at least in part, at a temperature Tp greater than or equal to 50° C.; the process including a step of gradual heating of the reaction mixture until acceleration of the polymerization reaction is achieved.

The application discloses a kind of electrospinning preparation methods of superfine, no adhesion polyether ketone ketone nanofiber membrane: polyether ketone ketone is dissolved in solvent to obtain polyether ketone ketone spinning solution;Polyether ketone ketone spinning solution is loaded in the injector of electrospinning device, and spinning is carried out;The concentration of ethanol or water in spinning environment is improved using solvent atomization between injector needle and collecting device, and polyether ketone ketone jet phase separation is accelerated;The nascent polyether ketone ketone nanofiber is collected into membrane;The fiber membrane collected is soaked in coagulation liquid to make solvent remaining in fiber precipitate, after taking out, dry, obtain polyether ketone ketone nanofiber membrane.The application realizes low concentration electrospinning using the unique interchain topological entanglement of polyether ketone ketone, and promotes phase separation by introducing solvent atomization between spinneret and collecting device, overcome the problem that other polymers are difficult to obtain continuous fiber and fiber is easy to adhere in low concentration electrospinning, and prepare superfine, no adhesion polyether ketone ketone nanofiber membrane.

The invention discloses a preparation method of polyetherketoneketone, polyetherketoneketone and application. The method comprises the following steps: (1) mixing raw materials at a first temperature, the raw materials comprising acyl chloride, a solvent, Lewis base, diphenyl ether and Lewis acid, carrying out heat preservation, heating to a second temperature, and carrying out a first reaction stage; (2) heating to a third temperature for reaction, and carrying out a second reaction stage; (3) adding a terminator into the reaction mixture in the step (2); the heating rate in the step (1) and the heating rate in the step (2) are respectively and independently 0.1-5 DEG C / min, the weight-average molecular weight of the polyetherketoneketone prepared by the method is 5000-200000, and the molecular weight distribution coefficient is 2.5-4.5. The polyetherketoneketone with relatively narrow molecular weight distribution is obtained through an electrophilic substitution path.

To provide a resin film for thrust bearings which improves heat resistance or durability, can prevent a recess, etc., from being generated in a bearing portion and can be manufactured in a short time and at low cost, and a manufacturing method thereof.SOLUTION: A resin film 7 for thrust bearings supports a lower end 3 of a rotary shaft 2 of a motor 1, which is an actuator, in a slide contact manner. The resin film for thrust bearings is extrusion-molded by a molding material 9 containing at least a crystalline polyether ether ketone resin. A degree of crystallinity is 7.0% or more to 35.0% or less and a heating dimension change rate in an extrusion direction and a width direction at 200°C and 250°C is -7.9% or more to 5.0% or less when measured according to the JIS K7133, and a taper abrasion amount at 23°C is 3.9 mg or more to 20.0 mg or less when measured according to the JIS K7204. The molding material 9 of the resin film 7 for thrust bearings is the polyether ether ketone resin, thereby obtaining excellent abrasion resistance, heat resistance, etc.SELECTED DRAWING: Figure 1

The present invention relates to a high-temperature-resistant thermoplastic water-based composite sizing agent for carbon fibers and its preparation method. The sizing agent comprises amino-polyetherketoneketone, carboxylated carbon nanotubes, and deionized water. Compared with the prior art, the sizing agent of the present invention is a composite water-based sizing agent that does not contain any other additives and is environmentally friendly. Furthermore, this sizing agent addresses the issues of existing sizing agents being heat-resistant and unsuitable for carbon fiber-reinforced high-performance thermoplastic composites, significantly improving the interfacial bonding strength of carbon fiber-reinforced high-performance thermoplastic resin-based composites.

The invention discloses a purification method of a polyetherketoneketone crude product, and relates to the technical field of engineering resin materials, and the purification method comprises the following steps: quenching the polyetherketoneketone crude product, and pulverizing to obtain polyetherketoneketone crude powder; acid and a solvent are selected and mixed to obtain a mixed solvent; adding the polyetherketoneketone coarse powder into a reactor, adding a mixed solvent, stirring, swelling the polyetherketoneketone coarse powder, and releasing inorganic salt components wrapped in the polyetherketoneketone coarse powder; adding a hydrochloric acid ethanol water solution, refluxing, filtering, washing and decomplexing inorganic salt to obtain a purified polyetherketoneketone sample; and adding an ethanol water solution, washing, filtering and drying to obtain a purified product of polyether ketone ketone. According to the invention, the acid with good solubility to polyether ketone ketone and the solvent have a synergistic effect, so that the swelling effect is obviously improved, and the wrapped aluminum salt is fully released; the aluminum ions are decomplexed step by step through the hydrochloric acid ethanol water solution, and are subjected to multiple times of reflux washing, so that the aluminum residual quantity is reduced to 30 ppm or below, and the purification efficiency is improved by 90% or above.

The invention discloses a polyetherketoneketone fiber anti-adhesion porous spinning method. The method comprises the following steps: dissolving polyetherketoneketone to obtain a spinning solution, and extruding the spinning solution through a porous spinneret plate to form a plurality of spinning trickles; the trickles enter a first coagulating bath to be preliminarily coagulated and formed, and fibers are obtained; dividing the fibers by a split type dividing plate, guiding the fibers into a second coagulating bath by a godet, washing with water, applying oil, and then drying; fibers enter the hot drafting device to be subjected to multi-stage hot drafting, and after heat setting, the fibers are tidied and wound by the buncher. The first coagulating bath is provided with a bath lotion supplementing unit, a circulating filtering system and an ultrasonic generator which are combined to quickly and uniformly update components of the coagulating bath; and the split type filament separating plate keeps a distance between fibers, prevents mutual adhesion and improves the double-diffusion efficiency in the second coagulating bath. The ultrasonic-assisted circulating filtration system is used for updating the synergistic effect of the coagulating bath and the split type filament separating plate, so that the problems that fibers are easy to adhere and are uneven in evenness and performance are effectively solved.

Use of a composite as a heat and fire shielding material particularly in batteries, wherein the composite comprises at least one layer of a thermoplastic material, wherein said at least one layer is based on an at least partial consolidation of a mixture of: a. one or more thermoplastic fibers selected from the group consisting of polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyether ketone-ketone (PEKK), polyether imide (PEI), polyether sulfone (PES), polysulfone (PSU), polyphenylene sulfone (PPSU), polyimide (PI), polycarbonate (PC), polyamide (PA), polyaryletherketone (PAEK) or any combination thereof; and b. one or more reinforcement fibers; wherein at least 90 vol % of the one or more reinforcement fibers have an average length according to a gaussian normal distribution of at least 6 mm, preferably of at least 10 mm, more preferably of at least 20 mm.

The invention relates to an assembly comprising a first part and a second part, each part comprising a polymer; and a film located between and adhered to the first part and the second part. The film comprises a blend of at least two poly(ether ketone ketone) (PEKK) polymers and optionally at least one nucleating agent. The assembly has improved fracture toughness and overall good mechanical properties.

Polyaryletherketone aerogels. In particular, a method of making polyaryletherketone aerogels using environmentally benign solvents for gel formation. In addition, a method is provided for 3D printing of such polyaryletherketone aerogels. The polyaryletherketone aerogels may specifically be sourced from poly(ether ether ketone) (PEEK) or poly(ether ketone ketone) (PEKK).

The invention relates to a binder, slurry, a lithium battery positive electrode and a lithium battery, the binder comprises a first polymer, a second polymer, a third polymer and a fourth polymer, the first polymer is selected from at least one of polyvinylidene fluoride-hexafluoropropylene, polyvinyl alcohol, polyvinylidene fluoride, polyacrylonitrile, polycarbonate and polyacrylic acid, and the second polymer is selected from at least one of polyvinylidene fluoride-hexafluoropropylene, polyvinyl alcohol, polyvinylidene fluoride, polyacrylonitrile, polycarbonate and polyacrylic acid. The second polymer is selected from at least one of sulfonated polyetheretherketone, sulfonated polyethersulfone, sulfonated polyetheretherketone, sulfonated polyetheretherketone lithium, sulfonated polyethersulfone lithium and sulfonated polyetheretherketone lithium, the third polymer is a conductive polymer, and the fourth polymer is a copolymer of ethylene and acrylic acid. The binder disclosed by the invention has relatively good lithium ion conduction effect, electron conduction effect and binding performance.

The invention relates to a composition comprising: a poly(ether ketone ketone), PEKK1; a thermoplastic polyimide having a glass transition temperature greater than or equal to 230°C, TPI; and optionally, a poly(aryl ether ketone), PAEK, PAEK being distinct from PEKK1. PEKK1 represents at least 50% by weight, relative to the total weight of PEKK1, TPI and, where applicable, PAEK, of the composition. PAEK is necessarily present when the TPI content is greater than or equal to 20% by weight, and preferably when the TPI content is greater than or equal to 15% by weight, relative to the total weight of PEKK1 and TPI of the composition.

The invention discloses a visual all-polymer prepared chromatographic column and a prepared chromatographic purification method thereof. The visual all-polymer prepared chromatographic column comprises a column tube made of a transparent amorphous polyether ketone ketone material and end covers connected to the two ends of the column tube, a multi-stage sealing structure is arranged between the end cover and the column tube, so that the column tube forms a continuous visual window for observing the separation process in the column in real time; the multistage sealing structure comprises at least one radial sealing ring arranged between the end cover and the inner wall of the column pipe, a buffer gasket arranged between the end face of the end cover and the end face of the column pipe, and a locking hoop used for providing axial pressing force for the radial sealing ring and the buffer gasket. The column tube provided by the invention is fully transparent, allows real-time visual observation, has high-pressure sealing reliability, high chemical inertness and good mechanical strength, and can improve the preparation and purification efficiency, intuition and reliability.

The invention relates to the field of macromolecules, and discloses a method for refining polyetherketoneketone and a polyetherketoneketone refined product. The method comprises the following steps: (1) treating a polyetherketoneketone complex by adopting a pretreatment agent; (2) the polyether ketone ketone crude product and a mixed chain supporting solution are mixed and washed, a first product is obtained, the mixed chain supporting solution comprises a main chain supporting agent and a cosolvent, the main chain supporting agent comprises one or more selected from parachlorophenol, trifluoroacetic acid, difluoroacetic acid, dichloroacetic acid and chloroacetic acid, the cosolvent comprises one or more selected from N, N-dimethylformamide and dimethyl sulfoxide, and the main chain supporting agent comprises one or more selected from dichlorophenol, trifluoroacetic acid, difluoroacetic acid, dichloroacetic acid and chloroacetic acid. The solvent is one or more of water, N-methyl pyrrolidone and N-methyl formamide; (3) adding a mixed aqueous solution into the first product to remove at least part of metal ions to obtain a second product; and (4) washing the second product for multiple times by using an organic solvent, and washing and drying to obtain the refined polyether ketone ketone. The content of aluminum ions in the polyetherketoneketone prepared by the method is low.

The application discloses a kind of polyether ketone ketone and preparation method thereof, the application is first added terephthaloyl chloride or isophthaloyl chloride and diphenyl ether, then under the condition of adding catalyst anhydrous aluminium chloride, low-temperature prepolymerization for a certain time, then the remaining diphenyl ether is added to complete the short-chain end-capping reaction.The application reduces the temperature in the early stage of the starting reaction process and adopts the reflux method in the selection of the washing reagent in the later stage, so that the purity and molecular weight of the obtained high molecular polymer polyether ketone ketone are high.The content of aluminum, a catalyst contained in PEKK, is lower, and the intrinsic viscosity (molecular weight) and tensile strength of the tested product are higher.

The invention relates to a method for producing a polyetherketoneketone which comprises bringing an aromatic ether which is diphenyl ether, 1,3-bis(4-phenoxybenzoyl)benzene, 1,4-bis (4-phenoxybenzoyl) benzene or a mixture thereof into contact with an acyl chloride which is isophthaloyl chloride, terephthaloyl chloride or a mixture thereof, a Lewis acid, and a first fraction s1 of a reaction solvent, so as to form a premix at a temperature T0 of less than or equal to 25°C, and bringing the premix formed at T0 into contact with a fraction s2 of the reaction solvent, the fraction s2 of reaction solvent being preheated, so as to form a reaction mixture brought to a temperature T1.

The invention relates to the technical field of multi-thread screw extrusion, in particular to a multi-thread screw extrusion system of a polyetherketoneketone composite material and a use method of the polyetherketoneketone composite material, the multi-thread screw extrusion system comprises a double-screw extruder feed hopper used for feeding the polyetherketoneketone composite material, and the double-screw extruder feed hopper comprises a hopper body; a supporting hole for mounting a connecting pipeline is formed in the hopper body; a mixing assembly is installed in the middle of the upper end of a feeding hopper of the double-screw extruder, and four sets of batching pipelines with the adjacent included angles being 90 degrees are installed on the periphery of the upper end of the mixing assembly. Various materials can be preliminarily mixed before entering the double-screw extruder, so that the mixing uniformity degree in the material processing process is improved, and the mixing efficiency is improved; and meanwhile, in the process that the materials enter the material mixing assembly, collision can occur, dust on the surfaces of the materials can be raised conveniently, the dust can be treated in time in cooperation with the arranged dust removal assembly, and the production quality is effectively improved.

The invention discloses a production method and application of polyetherketoneketone, and relates to the technical field of polymer synthesis. The production method of the polyetherketoneketone comprises the following steps: a method I: in an inert atmosphere, carrying out polymerization reaction on acyl chloride and diphenyl ether in the presence of Lewis base, Lewis acid and a reaction solvent for a period of time, adding a fluorine-containing end-capping reagent, and continuously reacting for 2-5 hours to obtain end-capped polyetherketoneketone; or the method II comprises the following steps: in an inert atmosphere, carrying out polymerization reaction on acyl chloride, diphenyl ether and a fluorine-containing end-capping reagent in the presence of Lewis base, Lewis acid and a reaction solvent to obtain the end-capped polyether ketone ketone. The fluorine-containing end-capping reagent is adopted for end capping of PEKK, so that the molecular weight and molecular weight distribution of PEKK are effectively controlled, the thermal stability and chemical inertness of the end group of PEKK are remarkably enhanced, and the hydrophobicity of PEKK is improved.

The invention discloses a method for preparing polyetherketoneketone and polyetherketoneketone prepared through the polyetherketoneketone, and the method comprises the steps that 1, a first part of raw materials, diphenyl ether and a solvent are added into a reaction container, and the first part of raw materials comprise part of lewis acid and part of lewis base; (2) adding a first acyl chloride solution at a first dropwise adding rate; (3) after heating, adding a second part of raw materials, and dropwise adding a second acyl chloride solution at a second dropwise adding rate, the second part of raw materials comprising the rest Lewis acid and Lewis base, and the molar ratio of the Lewis acid and Lewis base in the first part of raw materials to the Lewis acid and Lewis base in the second part of raw materials is (5-9): (5-1); the mass ratio of acyl chloride in the first acyl chloride solution to acyl chloride in the second acyl chloride solution is (5-9): (5-1), and the first dropwise adding rate and the second dropwise adding rate are 2.2% vol / min-6. 6% vol / min. The polyetherketoneketone prepared by the method is narrow in molecular weight distribution.

The application discloses a method for preparing polyether ketone ketone and polyether ketone ketone prepared by the method, and the method comprises the following steps: (1) adding a first part of raw materials and diphenyl ether and a solvent into a reaction container, wherein the first part of raw materials comprises part of a Lewis acid and part of a Lewis base; (2) adding a first acyl chloride solution at a first dropping speed; (3) after temperature rising, adding a second part of raw materials and adding a second acyl chloride solution at a second dropping speed, wherein the second part of raw materials comprises the remaining Lewis acid and Lewis base, the molar ratio of the Lewis acid and the Lewis base in the first part of raw materials to the Lewis acid and the Lewis base in the second part of raw materials is (5-9):(5-1), the mass ratio of acyl chloride in the first acyl chloride solution to acyl chloride in the second acyl chloride solution is (5-9):(5-1), and the first and second dropping speeds are 2.2%vol / min-6.6%vol / min. The polyether ketone ketone prepared by the method has a narrow molecular weight distribution.

The invention discloses a preparation method of a 1, 4-bis (4-phenoxy benzoyl) benzene-AlCl3 complex, and belongs to the technical field of polymer monomer preparation, aromatic diacyl chloride and aromatic ether are used as raw materials, a crude product of the 1, 4-bis (4-phenoxy benzoyl) benzene-AlCl3 complex is continuously synthesized under the catalysis condition of a Lewis acid catalyst, and the crude product of the 1, 4-bis (4-phenoxy benzoyl) benzene-AlCl3 complex is subjected to post-treatment to obtain the 1, 4-bis (4-phenoxy benzoyl) benzene-AlCl3 complex. The high-purity 1, 4-bis (4-phenoxy benzoyl) benzene-AlCl3 complex can be used as a polyether ketone ketone active monomer, and the effect of the active monomer can be exerted without adding aluminum in the polymerization reaction process.

The application discloses a method for improving the hydrophilicity of a PEKK chromatographic column screen plate by surface treatment and a modified screen plate thereof, relates to the technical field of PEKK chromatographic column screen plates, and comprises a screen plate, wherein the base material of the screen plate is polyether ketone ketone (PEKK) containing a diketone group (-CO-CO-) in the molecular structure. The application realizes efficient and directional surface modification by precisely utilizing the unique diketone group of PEKK as an advantageous modification site through a series of structures. The strong anchoring effect of the diketone group makes the formed hydrophilic layer combined with the base material exceptionally firmly, and significantly improves the durability of the coating. Compared with a traditional PEEK screen plate, the product can effectively inhibit bubble generation and retention in a high-aqueous-phase mobile phase, thereby ensuring stable system pressure and obtaining a smooth baseline, and finally greatly improving the reproducibility, sensitivity and column efficiency of chromatographic analysis.

The present invention relates to a method for producing polyetherketoneketone (PEKK). The method for producing PEKK includes the steps of: a) mixing 1,4-EKKE, terephthaloyl chloride (TCL) and isophthaloyl chloride (ICL) with an aprotic solvent under cooling to obtain a reaction solution; b) mixing a Lewis acid and the reaction solution to obtain a product mixture containing a PEKK-Lewis acid complex; c) deactivating the PEKK-Lewis acid complex by contacting the product mixture obtained in step b) with an aliphatic alcohol and subsequently adding water to obtain PEKK, where the amount of water in step c) is not less than 25 wt% of the total amount of aprotic solvent and aliphatic alcohol; d) isolating the PEKK obtained in step c) by washing with a protic solvent and drying. The method provides for the production of recyclable PEKK under conditions in which the reaction medium formed during synthesis has low corrosivity, thus making it possible to reduce the likelihood of metals from the material of the reaction equipment being incorporated into the resulting polymer powder.

The present invention belongs to the technical field of composite materials, and in particular to a carbon fiber reinforced thermoplastic resin-based composite material and its preparation method and application. The material preparation steps are as follows: preparing a polyetherketoneketone suspension, using the polyetherketoneketone suspension to prepare carbon fiber reinforced polyetherketoneketone prepregs with carbon fiber contents of 60-80wt%, 40-60wt% and 20-40wt% respectively; mixing polyetherketoneketone powder and nanofiller, and spraying them onto the surface of the obtained carbon fiber reinforced polyetherketoneketone prepreg; laying the obtained carbon fiber reinforced polyetherketoneketone prepregs in the order of carbon fiber content from low to high on a surface layer without carbon fiber; and forming by hot pressing with the aid of infrared radiation heating to obtain the carbon fiber reinforced thermoplastic composite material; the carbon fiber reinforced thermoplastic composite material of the present invention has both anti-low temperature medium leakage, anti-static function and excellent mechanical strength.

A powder composition suitable for use in selective laser sintering for printing an object. The powder composition includes a first fraction having a polyetherketoneketone (PEKK) powder having a plurality of particles. The powder composition includes a second fraction having a plurality of siloxane particles that is dry blended with the PEKK powder prior to selective laser sintering of the powder. In some embodiments, the powder composition includes a third fraction of carbon fiber. The powder composition when used in selective laser sintering results in parts with more consistent results and improves process economics.

The invention discloses a high-strength polyetherketoneketone polymer and a preparation method thereof, and belongs to the technical field of macromolecular special engineering plastics. The high-strength polyether ketone ketone polymer is obtained by reacting diaryl ether, paraphthaloyl chloride, isophthaloyl chloride and anhydrous aluminum trichloride in a molar ratio of 1: m: (1-m): (3-5), wherein m is 0-1. According to the high-strength PEKK polymer, two large condensed rings and one benzene ring form a minimum repetitive unit, and compared with a traditional PEKK polymer which forms a minimum repetitive unit by three benzene rings, a molecular main chain of the high-strength PEKK polymer has higher rigidity, and an engineering material prepared from the high-strength PEKK polymer also has higher mechanical strength and high temperature resistance.

The invention discloses a production process of fine powder polyetherketoneketone, and belongs to the technical field of high-molecular polymer preparation, aromatic ether and aromatic diacyl chloride are used as raw materials, and the fine powder polyetherketoneketone is prepared through continuous flow reaction prepolymerization, molecular weight regulation, intermittent kettle type polymerization and post-treatment under the catalytic action of Lewis acid. The method is characterized in that the homogenized and sheared raw materials are subjected to prepolymerization and molecular weight regulation and control processes in a reactor with strong mass and heat transfer characteristics, so that the problems of wall adhesion and scaling in the traditional process can be avoided, rapid nucleation is induced to produce a fine powdery polyether ketone ketone product of which the average particle size is not greater than 100 microns, and the fine powdery material is easy to post-treat and purify and has good industrial application prospects. The production cost and the three-waste output are obviously reduced.