68 results about "Aluminium alkyl" patented technology

1. A method for transitioning two different catalysts during the production of a polypropylene homopolymer or copolymer in a sequential multi-stage polymerization reaction, said method comprising: a) polymerizing propylene and optionally a comonomer in the presence of a first catalyst in a multi-stage polymerization reactor system comprising a prepolymerization reactor followed by a slurry reactor and then a gas phase reactor; b) discontinuing the supply of the first catalyst to the prepolymerization reactor; c) subsequently introducing propylene, optionally a comonomer, and a second catalyst into said prepolymerization reactor, and further introducing an aluminum alkyl into said polymerization reactor simultaneously with said introduction of said second catalyst; d) polymerizing propylene and optionally a comonomer in the presence of a second catalyst in said multi-stage polymerization reactor system. The process includes the steps of: wherein the first catalyst is a Ziegler-Natta catalyst and the second catalyst is a single-site catalyst; and wherein the amount of aluminum alkyl supplied in step c) is 0.5 to 10.0 g per ton of total propylene supplied into the prepolymerization reactor and the slurry reactor in steps c) and d). The method.

Method for gas phase atomic layer deposition (ALD) of aluminum oxide films on patterned substrates using a waterless oxidizer that includes an aluminum alkoxide gas. The method includes providing a substrate containing a dielectric layer and a metal layer or a semiconductor layer, and selectively depositing an aluminum oxide film on a surface of the dielectric layer relative to a surface of the metal layer or a surface of the semiconductor layer by a) exposing the substrate to an aluminum alkyl gas, an aluminum halide gas, or an aluminum hydride gas, and b) exposing the substrate to an aluminum alkoxide gas, where the aluminum alkoxide gas is the principal source of oxygen in the aluminum oxide film.

The invention relates to ethylene homopolymerized wax and a polymerization preparation method thereof. The invention relates to a polymerization preparation method of ethylene homopolymerized wax. The method comprises the following steps: under a catalytic system comprising one or more of a non-metallocene catalyst and a metallocene catalyst as a main catalyst and one or more of aluminoxane, boride, aluminum alkyl and aluminum alkyl chloride as a co-catalyst, carrying out a reaction on the main catalyst and the co-catalyst, ethylene is subjected to a polymerization reaction in the presence of hydrogen in an alkane solvent having a boiling point of 0-90 DEG C or a mixed alkane solvent having a saturated vapor pressure of 4-200 KPa at 20 DEG C as a polymerization solvent (preferably an alkane solvent having a boiling point of 25-82 DEG C or a mixed alkane solvent having a saturated vapor pressure of 30-160 KPa at 20 DEG C as a polymerization solvent). The ethylene homopolymer is narrow in molecular weight distribution, high in crystallinity, low in needle penetration, high in devolatilization efficiency and low in ash content, and the ethylene homopolymer wax shows excellent dispersity in the application of the color master batch and is excellent in processing performance.

The invention provides an ethylene non-selective oligomerization catalyst. The catalyst can be matched with co-catalysts such as alkyl aluminum and alkoxy aluminum which are commonly used for oligomerization to form a catalyst system, and ethylene is catalyzed to be subjected to oligomerization reaction. Due to the special steric hindrance effect of the tetrahedral center structure of the catalyst molecule, the stability of the active center can be protected during ethylene non-selective oligomerization, and the service life and the activity of the catalyst are improved; more importantly, the space structure can effectively limit the growth of an active ethylene chain, so that the repetitive unit of the active ethylene chain is controlled within a certain range, the formation of a long carbon chain is avoided, and the effective gain effects are that the generation of oligomerization wax components is reduced, the content of short-chain alpha-olefin is increased, and the generation of high-molecular-weight PE is prevented. The catalyst with high activity, high selectivity and no polymer generation has high industrial application value in the field of ethylene non-selective oligomerization.

The invention provides a metallocene catalyst and a preparation method and application thereof. The method comprises the following steps: providing a first silicate aqueous solution with the pH value of 9-10 as a base solution; mixing the second silicate aqueous solution, inorganic acid and the base solution, and aging at 70-80 DEG C to obtain a first mixed solution; mixing and reacting the first mixed solution, an alkaline substance and organic alcohol to obtain a second mixed solution; mixing and reacting the second mixed solution, an alkaline substance and organic alcohol to obtain a hydrogel system; mixing the hydrogel system with inorganic acid to obtain acidified gel; performing first post-treatment to obtain a silica gel carrier; carrying out thermal activation on the silica gel carrier, and mixing and reacting with an aluminum alkyl solution to obtain MAO modified silica gel; and mixing the MAO modified silica gel with a metallocene compound, reacting, and carrying out second post-treatment to obtain the metallocene catalyst, wherein the alkaline substance comprises one or a combination of more than two of ammonia water, ammonium carbonate and ammonium bicarbonate. The metallocene catalyst has good catalytic activity.

The present disclosure provides a heterogeneous photocatalyst, a preparation method and application thereof. The heterogeneous photocatalyst comprises a nano semiconductor with photocatalytic performance, polyolefin acid particles and an alpha-diazo nickel metal catalyst. The polyolefin acid particles are formed with the nano semiconductor as a condensation nucleus to form a catalytically active layer on the surface thereof, and the alpha-diazo nickel metal catalyst is loaded by using the carboxyl-metal ion dynamic crosslinking point contained in the polyolefin acid particles. The present disclosure also provides a preparation method of the heterogeneous photocatalyst, comprising: dissolving and uniformly mixing the nano semiconductor and alkyl aluminum protected olefin acid monomers at a first reaction temperature, and then adding a cocatalyst and an alpha-diazo nickel metal catalyst; allowing the polymerization reaction of the olefin acid monomers to occur at a second reaction temperature, and forming a polyolefin acid catalytically active layer on the surface of the nano semiconductor after heterogeneous nucleation, and then cooling to a third reaction temperature after standing or stirring for a period of time to obtain the heterogeneous photocatalyst.

This invention belongs to the field of synthetic rubber preparation technology, specifically relating to low Mooney viscosity atactic 1,2-polybutadiene, its preparation method, and its applications. The preparation method of the low Mooney viscosity atactic 1,2-polybutadiene includes the following steps: under a protective gas atmosphere, adding a phosphate ester compound to a molybdenum compound, aging and cooling, then adding toluene to obtain a main catalyst; placing a trialkylaluminum alkane solution in an ice-water bath, adding aryloxy ligands dropwise to the container, and reacting in an ice-water bath to obtain a co-catalyst; dissolving butadiene in an alkane solution, adding the co-catalyst, main catalyst, activator, and molecular weight regulator respectively, and carrying out a polymerization reaction to obtain low Mooney viscosity atactic 1,2-polybutadiene. This invention provides a method for preparing low Mooney viscosity atactic 1,2-polybutadiene with high conversion rate; the obtained 1,2-PB has a low Mooney value and a high 1,2-structure content; it can be applied to rubber additives and damping materials to improve their performance.

The invention relates to the technical field of organic alcohol preparation, and discloses a method for preparing iso-tridecanol from Fischer-Tropsch olefin. The method comprises the following steps: (1) mixing a Fischer-Tropsch C6 fraction section, aluminum alkyl and a supported metal, and then introducing hydrogen into the obtained mixture for polymerization reaction to obtain isododecene; (2) mixing the isododecene, a cobalt catalyst and a diphosphine ligand, then introducing synthesis gas into the obtained reaction mixture, and carrying out hydroformylation reaction to obtain isotridecanal; and (3) in the presence of a hydrogenation catalyst, mixing the iso-tridecanal with hydrogen to carry out aldehyde hydrogenation reaction. The method has the characteristics of easily available raw materials, high conversion rate, good selectivity, high yield of iso-tridecanol, mild reaction conditions and relatively strong process stability, and the method is simple and convenient to operate and good in economic benefit, highly conforms to large-scale industrial production requirements, and shows remarkable economic value and wide industrial application prospects.

The embodiment of the utility model provides an infrared light detection system for petroleum and petrochemical fires, and relates to the technical field of petrochemical engineering and fire fighting. The system comprises a sound-light alarm unit and an infrared detection dry powder fire extinguishing unit, wherein the infrared detection dry powder fire extinguishing unit comprises a trigger judgment device and a fire extinguishing tank which are connected with each other; wherein a dry powder extinguishing agent is stored in the fire extinguishing tank, the trigger judgment device comprises an infrared flame detector, a judgment unit and a trigger actuator which are connected in sequence, and the trigger actuator is connected with the fire extinguishing tank and the sound-light alarm unit; and the trigger judgment device is used for collecting flame infrared characteristics, controlling the fire extinguishing tank to spray a dry powder fire extinguishing agent and controlling the sound-light alarm unit to send out a sound-light alarm signal. The system aims at small-space fire disasters in the petrochemical industry field, especially alkyl aluminum fire disasters, can realize rapid fire extinguishing, mainly adopts infrared light detection, and is simple and convenient to install and maintain.

The invention discloses a naphthalene diimine ligand compound, and particularly relates to 1, 4, 5, 8-naphthalene tetraformyl diimide. The ligand compound is high in rigidity and coordination capacity, and N and O atoms on the ligand can participate in coordination, so that the catalyst composition is formed by the ligand compound, a transition metal compound and an aluminum alkyl cocatalyst, and when the catalyst composition is used for selective oligomerization of ethylene, the catalyst composition and transition metal can form a relatively stable complex, and the selectivity of ethylene is improved. The reaction has the characteristics of strong high temperature resistance, strong selectivity and less side reaction.

The invention discloses a method for preparing syndiotactic polystyrene through transition metal catalysis. According to the method, an aryl ether-transition metal chromium compound is adopted to catalyze styrene to polymerize so as to prepare syndiotactic polystyrene. According to the preparation method of the compound, an aryl ether compound reacts with tetrahydrofuran chromium trichloride to obtain a chromium complex, then the chromium complex and aluminum alkyl form a catalytic system, bulk polymerization is performed in styrene to obtain syndiotactic polystyrene, and the syndiotactic polystyrene has the advantages of good stereoselectivity and high activity.

The application relates to an ethylene selective oligomerization catalyst containing a saturated aliphatic ring skeleton biphosphine ligand and preparation and application thereof, the catalyst comprising a ligand, a transition metal compound and an activator, the chemical structural formula of the ligand being: wherein the groups R 1 to R 4 are each independently hydrogen, an alkyl group, an alkoxy group, an alkenyl group or an aromatic group; n is a positive integer, and the value range is 3-5; the transition metal in the transition metal compound is selected from iron, cobalt, nickel, copper, titanium, vanadium, chromium, manganese, molybdenum, tungsten or palladium; and the activator comprises an alkyl aluminum compound, an aluminoxane compound or an organic boron compound. Compared with the prior art, the catalyst provided by the application has higher catalytic activity and total selectivity of 1-hexene / 1-octene, and the polymer content is lower, so that the production cost is greatly reduced, the requirements of the industrial department can be met, and the catalyst has important application value.

Provided is a cyclic olefin copolymer production method that can produce, with high efficiency, a cyclic olefin copolymer that is a copolymer of a cyclic olefin monomer and an α-olefin monomer having 3-20 carbon atoms and that has excellent toughness.　According to the present invention, a copolymer of a cyclic olefin monomer and an α-olefin monomer having 3-20 carbon atoms is produced using a method comprising: a first polymerization for polymerizing monomers including the cyclic olefin monomer and the α-olefin monomer in a polymerization vessel in the presence of a titanocene catalyst, an alkyl aluminum compound, and a borate compound; addition of an alkyl aluminum compound solely to the polymerization vessel after the first polymerization; and a second polymerization for further adding the monomers into the polymerization vessel after the addition of the alkyl aluminum compound, and continuously polymerizing the monomers.

The invention discloses a preparation method of 2-(alkyl / aryl R substituted) acyl-1, 10-phenanthroline, a condensation amine ligand and a condensation amine transition metal complex and a composite catalyst. 1, 10-phenanthroline and a lithium diisopropylamide reagent are subjected to ortho-lithiation reaction and then subjected to nucleophilic reaction with an alkyl / aryl carboxylic acid compound, and the compound shown in the formula (a) is obtained. The nontoxic lithium diisopropylamide reagent (LDA) is adopted to be subjected to non-nucleophilic ortho-lithiation reaction, and a traditional synthesis reaction containing highly toxic cyanide is replaced; an expensive nucleophilic reagent such as aluminum alkyl or lithium alkyl is replaced; the 2-(alkyl / aryl R substituted) acyl-1, 10-phenanthroline amine transition metal complex as shown in the formula (e), which is prepared and synthesized by replacing nitrobenzene and toxic selenium dioxide with a cheap and nontoxic carboxylic acid compound, has stronger ligand skeleton expansibility and higher compound stability, and is convenient for storage of a catalyst.

The invention provides a preparation method of a vanadium polyethylene catalyst, which comprises the following steps: mixing and reacting a mixed solution of iodine, chloralkane and ether with metal magnesium to obtain an organic magnesium solution; the method comprises the following steps: mixing an organic magnesium solution with fatty acid ester for reaction to obtain a mixture, and then mixing the mixture with a chlorination reagent for reaction to obtain a solid magnesium-containing product; preparing a hydrocarbon solution of a solid magnesium-containing product, and mixing the hydrocarbon solution with an aluminum alkyl compound for reaction to obtain a magnesium-containing carrier; finally, adding a hydrocarbon solvent into the magnesium-containing carrier to obtain a magnesium-containing carrier suspension; wherein the chlorination reagent comprises halogenated aromatic hydrocarbon and carbon tetrachloride; and mixing the magnesium-containing carrier suspension and the vanadium-containing solution for reaction to obtain the vanadium polyethylene catalyst. The preparation method can further reduce the content of phenyl-containing compounds in the synthesis process of the vanadium polyethylene catalyst, and further improve the environmental friendliness of a polymerization product; the vanadium polyethylene catalyst prepared by the method is relatively high in vanadium content and has relatively high polymerization activity.

The invention provides a preparation method and a bromination method of low-molecular-weight functionalized polystyrene, and belongs to the technical field of high polymer materials. The nickel complex is used as a main catalyst, copolymerization of styrene and polar styrene is successfully catalyzed through aluminum alkyl activation, low-molecular-weight functionalized polystyrene is obtained, and the polar monomer insertion rate of the low-molecular-weight functionalized polystyrene can reach 60% at most. The system does not need complex ligand design and is low in cost, the yield of the obtained low-molecular-weight functionalized polystyrene is high, the low-molecular-weight functionalized polystyrene obtained through a copolymerization method can be further used for preparing low-molecular-weight functionalized brominated polystyrene, and the low-molecular-weight functionalized brominated polystyrene has excellent thermal stability and can be used for preparing the low-molecular-weight functionalized brominated polystyrene. Polar groups in the low-molecular-weight functionalized brominated polystyrene have stronger interaction with a polar polymer matrix, so that the low-molecular-weight functionalized brominated polystyrene shows better dispersion performance and interfacial compatibility in the polar polymer matrix, and the polar polymer matrix is endowed with excellent flame retardant property.

The invention relates to the technical field of olefin polymerization, discloses a method for improving gas-phase copolymerization activity of propylene and alpha-olefin and a polymer, and aims to solve the problems of low polymerization activity and non-uniform rubber phase distribution caused by residual inhibitory activity center of an external electron donor in a copolymerization stage of a conventional Ziegler-Natta catalyst. The preparation method comprises the following steps: pre-complexing, pre-polymerizing, carrying out two-stage polymerization and post-treating, firstly, pre-complexing and pre-polymerizing a titanium Z-N catalyst, triethyl aluminum and cyclohexylmethyldimethoxysilane, and then carrying out first-stage propylene homopolymerization to obtain a high-isotacticity intermediate; after transition treatment, a mixture of a compound activity accelerant and triethyl aluminum is added into the second-stage gas-phase reactor, gas-phase copolymerization is performed under certain conditions, the compound activity accelerant and alkyl aluminum synergistically peel off an external electron donor and release an inhibited active center, so that the activity in the copolymerization stage is improved by 50% or above, and the method is adaptive to an existing industrial device and has a wide application prospect. The method is suitable for the fields of high-end automobile parts, household appliance shells and the like.

The invention discloses an anti-yellowing SBS polymer and a preparation method thereof, and relates to the technical field of high-molecular copolymers. According to the preparation method of the yellowing-resistant SBS polymer, firstly, lithium alkyl or aluminum alkyl compound is used as an impurity breaking agent at a low temperature to react with unavoidable impurities in styrene and butadiene monomers and auto-polymers to form inert substances, then the inert substances are removed through a molecular sieve bed or distillation, and the yellowing-resistant SBS polymer is obtained. The anti-yellowing SBS polymer provided by the invention has the advantages that impurities in styrene and butadiene monomers are fully removed, the situation that a block copolymer SBS cannot be formed in the polymerization process is avoided, the anti-yellowing problem of the SBS polymer is radically solved, and on the basis, the anti-yellowing SBS polymer provided by the invention can be kept not yellowing for more than 2 hours under external thermal stimulation of 180 DEG C, and the anti-yellowing SBS polymer has good anti-yellowing performance. And under the double stimulation of 50 DEG C thermal stimulation and light and heat of a 500 W xenon lamp, the product can be kept without yellowing for more than 360 hours.

The present disclosure provides novel methods of making aluminum complexes with utility for promoting epoxide carbonylation reactions. Methods include reacting neutral metal carbonyl compounds with alkylaluminum complexes, such as the alkylaluminum complexes represented by Formula I, where Q is a nitrogen atom and the four Q groups are part of a single porphyrin ligand and Rq is selected from optionally substituted C1-12 aliphatic and optionally substituted aryl:

The invention provides a preparation method of polyethylene oil, which comprises the following steps: fully contacting ethylene with a nickel metal combined catalyst and carrying out polymerization reaction to obtain the polyethylene oil, wherein the nickel metal combined catalyst comprises a main catalyst and a co-catalyst in a molar ratio of 1: (100-1000), the co-catalyst is aluminum alkyl, and the main catalyst is a bidentate nitrogen-doped nickel complex. According to the present invention, the substituent group of the amido of the adopted bidentate aza-matched nickel complex in the nickel metal combination catalyst is the flexible alkyl group with small steric hindrance, and the substituent group of the imine is the rigid aryl group with large steric hindrance, such that the highly branched low molecular weight polyethylene oil can be prepared with the catalyst under the high pressure at the high activity so as to improve the polyethylene oil yield.

The invention provides a catalyst for COP (cycloolefin polymer) polymerization as well as a preparation method and application of the catalyst. The catalyst consists of an active component and an auxiliary agent. The active component is a homogeneous complex formed by divalent or trivalent ruthenium salt and a specific phosphine ligand, the auxiliary agent is an alkylaluminoxane compound, and the addition amount of the auxiliary agent is 3-8% of the mass of the active component. The preparation method of the catalyst comprises the steps of ruthenium precursor solution preparation, ligand complexation reaction, assistant introduction, crystallization and purification and the like, and is realized by accurately controlling reaction conditions and parameters. In application, the catalyst can act with a cycloolefin monomer under a ring-opening metathesis polymerization reaction condition, a new way is provided for synthesis of a cycloolefin polymer COP, the problems of low catalytic efficiency and many side reactions in COP polymerization are solved, and research and development of the catalyst have important significance on optimization of a COP polymerization process and improvement of polymer performance.

The invention discloses a method for obtaining different polar monomer copolymers and homopolymers through a catalyst composition, and particularly provides a catalyst composition composed of alkyl aluminum, organic boron salt and a catalyst. The composition can catalyze a block copolymerization reaction between a polymer with a repetitive unit as shown in a formula IV and a compound M to obtain a block copolymer III, the compound M can also be catalyzed to be subjected to polymerization reaction to obtain a polymer I with a repetitive unit as shown in the formula A. According to the method, coordination polymerization of polar monomers can be efficiently catalyzed, the used catalyst is high in stability, and the homopolymer and the block copolymer which are clear in structure can be obtained at high yield; the obtained polymer has a high glass transition temperature, and part of the polymer presents a dual glass transition behavior. .

The application discloses a preparation method of ultrahigh molecular weight poly-alpha-olefin, which uses one or more alpha-olefins as polymerization monomers, and carries out polymerization reaction under the action of a catalyst at-30-30 DEG C; the catalyst comprises a main catalyst, a cocatalyst and an external electron donor; the main catalyst is a solid catalyst component, which comprises magnesium, titanium, chlorine and an internal electron donor, and the mass ratio of the four is 1:10-100:20-400:1-5; the internal electron donor contains at least one dihydric alcohol ester compound; the cocatalyst is an alkyl aluminum compound; the external electron donor is selected from organosiloxane; and the molar ratio of the main catalyst (calculated according to titanium): the cocatalyst (calculated according to aluminum): the external electron donor (calculated according to silicon) is 1:10-500:0-500. The poly-alpha-olefin prepared by the method has a weight average molecular weight close to 10 million, and the drag reduction agent prepared from the poly-alpha-olefin has excellent drag reduction performance.

This invention relates to a supported transition metal catalyst system, its preparation, and its application. The catalyst system includes a main catalyst and a co-catalyst. The main catalyst is a supported transition metal catalyst, composed of a transition metal salt and a support, the surface of which contains one or more hydroxyl, mercapto, and nitrogen atoms. The co-catalyst is an alkylaluminum compound or an aluminoxane compound. The transition metal salt and the support are mixed in an organic solvent to prepare a supported transition metal catalyst linked by coordination, which is then reacted with the co-catalyst to obtain the supported transition metal catalyst system. This system is applied to the preparation of linear α-olefins and olefin polymers. The preparation method of this invention is simple; the obtained catalyst system is not only effective for olefin oligomerization but also catalyzes olefin polymerization to obtain high molecular weight polymers; this invention exhibits good product selectivity when used to prepare linear α-olefins and can produce high-density polyethylene when used to prepare olefin polymers.

The present application relates to the technical field of olefin polymerization, and discloses a catalyst system for preparing an olefin polymer and application thereof. The catalyst system comprises the following components: (1) a solid catalyst component containing Mg, Ti and an internal electron donor; (2) an alkyl aluminum compound; and (3) an external electron donor; wherein the internal electron donor is selected from at least one of main chain asymmetric glycol ester compounds; and the external electron donor is selected from at least one of halogen atom-free malonic acid ester compounds. The catalyst system has greatly improved hydrogen sensitivity when used in an olefin polymerization reaction, especially in a propylene polymerization reaction, and the polymer has a higher melt index.

The invention provides a method for preparing bimodal / wide molecular weight distribution polyethylene by using a single reactor, which comprises the following steps of: catalyzing ethylene homopolymerization or copolymerization of ethylene and alpha-olefin by using a hydrocarbon solvent as a dispersing agent and using a vanadium polyethylene catalyst and aluminum alkyl as a main catalyst and a cocatalyst respectively, hydrogen is used as a polymer molecular weight regulator in the reaction process; wherein the vanadium polyethylene catalyst comprises a magnesium-containing carrier and a vanadium compound loaded on the magnesium-containing carrier, the total weight of the vanadium polyethylene catalyst is 100%, the mass content of active metal vanadium is not less than 3.8%, the average particle size of the vanadium polyethylene catalyst is 9.0-13.5 [mu] m, and the particle size distribution SPAN value is less than 1. The vanadium polyethylene catalyst used in the invention has higher polymerization activity, and the obtained polymer has higher apparent density and lower fine powder and oligomer, and can be used for developing special resins for high-strength films, pressure-resistant pipes and the like.

The present application relates to the field of olefin catalytic polymerization, and aims to provide a catalytic system for preparing ultra-pure isotactic polypropylene and application thereof.The catalytic system comprises three components of a main catalyst, a cocatalyst and an external electron donor; wherein the main catalyst is a TiCl4 / MgCl2.ID supported high-efficiency spherical Ziegler-Natta catalyst, ID refers to diisobutyl phthalate or 2,2-diisobutyl-1,3-dimethoxypropane as an internal electron donor; the cocatalyst is a mixture of triethyl aluminum and triisobutyl aluminum; and the external electron donor is diisopropyl dimethoxysilane; or the cocatalyst is triethyl aluminum; and the external electron donor is a mixture of cyclohexyl methyl dimethoxysilane and dicyclopentyl dimethoxysilane.The catalytic system provided by the present application is simple to operate, does not need to synthesize complex-structure alkyl aluminum or siloxane, has controllable cost, and is easy to industrialize; and the product meets the requirements of low ash content, high polymerization activity and high isotacticity at the same time.

The utility model discloses an aluminum alkyl injection device and aims to solve the problems that an injection nozzle is easy to block and difficult to clean in the prior art. The device comprises a pipe nozzle assembly, wherein a first channel and a second channel which are communicated with each other are arranged in the pipe nozzle assembly; the aluminum alkyl feeding assembly is fixedly connected with the pipe nozzle assembly, and an aluminum alkyl injection channel of the aluminum alkyl feeding assembly intersects with the first channel at an acute angle, so that carrier gas is used for primary atomization; the three-way valve is detachably connected to the rear part of the pipe nozzle assembly and is used for switching a normal injection mode and a blockage clearing mode; and the unblocking overhauling assembly is connected to the rear end of the three-way valve, is composed of a second connecting piece and a detachable blind head, and is used for sealing the system under normal working conditions and providing a straight line entering channel of an unblocking tool when needed. According to the device, aluminum alkyl can be effectively scattered into mist in the pipe nozzle assembly, the mist aluminum alkyl is quickly dispersed after being injected into a reactor to initiate reaction, and the injection pipe nozzle is prevented from being blocked.

To provide a polybutadiene that can give a rubber composition that is excellent in tensile stress and low heat buildup.SOLUTION: There is provided a method for producing a block polybutadiene in which a cis-1,4-polybutadiene structure and a syndiotactic-1,2-polybutadiene structure are bonded, the method comprising: a step X of aging a halogen-containing organoaluminum and a first alkylaluminum in the presence of water; and a step Y of polymerizing 1,3-butadiene by mixing a polymerization catalyst and a second alkylaluminum in the presence of the resulting aged solution, wherein in step Y or before step Y, 1,3-butadiene is mixed with carbon disulfide, and wherein the concentration (A) of the halogen-containing organoaluminum, the concentration (B) of the first alkylaluminum, and the molar ratio (C) of the second alkylaluminum satisfy the following: 0.2≤(A) / {(B)+(C)}≤3.0...(1), 0.01≤(C) / (B)≤1.0...(2).SELECTED DRAWING: None

The invention belongs to the technical field of polymer material polymerization, and discloses long-chain branched polypropylene as well as a preparation method and application thereof. The preparation method of the long-chain branched polypropylene comprises the following steps: mixing propylene, hydrogen, a composite catalyst, an external electron donor and a functional agent, and carrying out polymerization reaction to obtain the long-chain branched polypropylene, the composite catalyst comprises a Ziegler-Natta catalyst and an aluminum alkyl catalyst. The preparation method of the long-chain branched polypropylene is economical and efficient, successfully overcomes the difficult problems of catalyst deactivation, processability degradation or unstable product performance easily caused by improvement of melt strength in the prior art, and can be used for preparing the long-chain branched polypropylene by accurately regulating and controlling the type and the dosage of peroxide. The long-chain branched polypropylene prepared by the preparation method disclosed by the invention is optimally balanced among melt strength, processing flowability and basic physical properties, and is particularly suitable for high-end application fields such as foaming, blow molding and thermal forming which have strict requirements on melt strength.