18 results about "Triethylaluminium" patented technology

The invention provides a high-pressure wear-resistant valve rubber. The valve rubber is prepared from the following raw materials in parts by weight: 100 parts of a polyurethane prepolymer, 20 to 30 parts of a chain extender, 12 to 18 parts of a polycaprolactone coated boron nitride / molybdenum disulfide composite material and 0.5 to 2 parts of an antioxidant. Wherein the polycaprolactone coated boron nitride / molybdenum disulfide composite material is obtained by polymerizing an amino silane coupling agent modified boron nitride / molybdenum disulfide composite material, triethyl aluminum and epsilon-caprolactone in an organic solvent at 35-45 DEG C in an inert atmosphere. A polycaprolactone-coated boron nitride / molybdenum disulfide composite material is used as a filler, and boron nitride / molybdenum disulfide as an inner core forms a synergistic structure of a reinforced substrate and a lubricating surface layer, so that high-pressure load bearing and friction coefficient reduction are facilitated; and the polycaprolactone flexible shell layer is compatible with the matrix, so that the filler is uniformly dispersed in the matrix.

The invention relates to the field of chemical synthesis, and discloses a method for constructing a full-alkyl quaternary carbon stereocenter through stereospecific conversion of chiral tertiary alcohol. The method successfully solves the industrial problem that the peralkyl quaternary carbon center is difficult to construct with high stereoselectivity due to huge steric hindrance and lack of electron difference, the process shows excellent stereospecificity and chemical selectivity, the ee value of the product is as high as 98%, the dr value is superior to 20: 1, and meanwhile, the excellent yield of 90% or above is kept; besides, according to the scheme, the substrate is wide in universality and can be compatible with various chemical small molecule substrates of different structures, the used reagents such as triethyl aluminum and KHMDS are cheap and easy to obtain, operation is easy and convenient, and a simple and efficient stereospecific conversion strategy with industrial application potential is provided for synthesis of complex drug intermediates.

The application discloses a preparation method of high-purity triethyl indium and relates to the technical field of metal organic source synthesis. Nowadays, high-purity indium source is a key raw material for MOCVD technology. Currently, the commonly used indium source is trimethyl indium. However, trimethyl indium is solid at room temperature, which easily causes problems such as excessive solid indium source residue, low solid molecule overflow rate, and hardening and channeling. Therefore, the solid indium source is worse than liquid source in vapor saturation and source content stability. In the application, the halide of indium and triethyl aluminum are reacted to generate triethyl indium under the protection of inert gas. The crude triethyl indium is purified by reduced pressure distillation. The finished triethyl indium is obtained by further purification. The whole process is simple in operation. In addition, the purity of the product is improved under the protection of inert gas, so that the preparation of triethyl indium is not affected by other solvents.

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 belongs to the technical field of high polymer material preparation, and particularly relates to a high-performance ethylene copolymer and a continuous preparation method and application thereof.The continuous preparation method comprises the following steps that a main catalyst and a co-catalyst are mixed and then subjected to pre-activation treatment, the main catalyst is a titanium-series Ziegler-Natta catalyst, and the co-catalyst is a titanium-series Ziegler-Natta catalyst; the cocatalyst is ethyl sesquialuminum chloride or triethyl aluminum; mixing the pre-activated main catalyst, the pre-activated cocatalyst, the ethylene monomer and the solvent in proportion, and then carrying out two-step polymerization reaction; carrying out flash evaporation on the glue solution after the polymerization reaction to remove volatile components; adsorbing and removing the residual catalyst from the glue solution from which the volatile components are removed by adopting modified aluminum oxide or a molecular sieve adsorbent; and mixing the glue solution without the catalyst with a composite antioxidant, and extruding and granulating to obtain the product. The technical problems that an ethylene copolymer prepared in the prior art is insufficient in mechanical property, poor in optical property, poor in oxidation resistance, wide in molecular weight distribution and the like can be effectively solved.

Provided are a preparation method and system for an alane and a use of the alane. The method comprises: preparation of triethylaluminum: using triethylaluminum as a seed and aluminum and hydrogen as raw materials to synthesize triethylaluminum by means of a direct synthesis method, wherein the newly synthesized triethylaluminum comprises triethylaluminum in an amount equal to the seed and triethylaluminum for alane synthesis; and preparation of alane: thermally decomposing the triethylaluminum for alane synthesis to obtain the alane, wherein the newly synthesized triethylaluminum in an amount equal to the seed is used as a new seed for new preparation of triethylaluminum. The present invention only consumes aluminum and hydrogen required for generating the alane during the preparation of alane, and other raw materials can achieve a balance between consumption and output during the production process, achieving recycling, low production costs, high safety performance, and low emissions.

The invention relates to an ion cluster catalyst, and belongs to the technical field of high polymer materials. The ion cluster catalyst is used for ethylene homopolymerization, and is formed by a connection reaction of a phosphine phenol nickel catalyst Ni 3 and a phenol ligand structure under the condition of a cocatalyst triisobutyl aluminum, trimethylaluminum or triethyl aluminum, the prepared ion cluster catalyst has excellent ethylene polymerization activity.

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.

This invention discloses a continuous purification method and system for triethylaluminum based on membrane separation and complexation. The method first uses a sterically hindered amine complexing agent to selectively pre-complex chloride-containing impurities in crude triethylaluminum. Then, it sequentially passes the crude triethylaluminum through an inorganic ceramic nanofiltration membrane to retain large molecular complexes, followed by the removal of small molecular volatile impurities using an organic pervaporation membrane. Finally, it undergoes deep purification via a composite adsorption tower. The entire process is carried out under mild conditions, is safe and efficient, and is easily operable continuously and automatically. It significantly reduces the content of chloride ions and colored impurities in the product, yielding high-purity triethylaluminum, making it particularly suitable for high-end polyolefin catalysis.

The utility model provides a kind of effectively improve reaction kettle device of triethylaluminium production efficiency, it solves the problems, such as aluminium powder reaction rate reduction and stirring system abrasion, it includes reaction kettle main part, reaction kettle main part inside rotation is installed with the stirring shaft extending along axial direction, fixed sleeve is installed between the stirring shaft lower end and reaction kettle main part, stirring disc connected with stirring shaft is rotationally installed at the bottom of reaction kettle main part, stirring blade is installed on stirring disc and adjusting assembly is arranged between stirring blade and stirring disc, high-pressure circulating pump is connected to the bottom and top of reaction kettle main part by circulation pipe.The utility model has the advantages of good reaction effect, stable structure and the like.

The present invention is in the field of coated organic particles, in particular comprising small molecules, by using atomic layer deposition. It relates to a process for preparing coated organic particles comprising: (a) bringing organic particles containing a halogen-containing organic compound in motion to each other, wherein the halogen-containing organic compound consists of nonmetals, (b) sequentially contacting the organic particles with triethyl aluminum and a decomposition compound in the gaseous state.

The invention belongs to the technical field of lubricating materials, and discloses ultralow-temperature anti-wear lubricating grease special for a robot. The lubricating grease is composed of 85%-92% of base oil, 6%-10% of a composite thickening agent, 1%-3% of a microencapsulation repairing agent and 0.5%-2% of an auxiliary additive. Wherein the microcapsule has a stress response type fracture characteristic, dicyclopentadiene and triethyl aluminum are released during local damage, and a high-hardness repair film is generated through in-situ polymerization; the composite thickening agent ensures thixotropic stability in a wide temperature range, and a base oil blending system ensures low viscosity and elasticity at-70 DEG C. According to the invention, a basic oil-composite thickening agent-stress response microcapsule three-in-one bionic lubricating system is constructed, so that the problem of irreversible wear caused by film embrittlement of traditional lubricating grease at-70 DEG C is solved; invalid consumption of the repairing agent is avoided; and the structural stability of the repairing film in subsequent operation is ensured. The method is suitable for application scenes such as polar region scientific investigation robots, deep space exploration mechanical arms and ultralow-temperature cold chain transfer robots which have strict requirements on joint reliability.

The disclosure provides a catalyst composition for the oligomerization of ethylene to produce one or more linear alpha olefins, the catalyst composition including a chromium compound, a heteroatomic multidentate ligand having an NPNPN backbone, wherein each P is an optionally substituted phosphino group and each N is an optionally substituted amino group, a methylaluminoxane, and triethyl-aluminum.

The utility model relates to a catalyst feeding system for a polyolefin device reactor. The catalyst feeding system comprises a reactor; a triethyl aluminum conveying pipeline; the feeding connecting pipe is connected to the catalyst injection port, the ethylene back flushing pipeline is connected with the feeding connecting pipe, and the connecting position of the ethylene back flushing pipeline and the feeding connecting pipe is located on the upstream of the connecting position of the triethyl aluminum conveying pipeline and the feeding connecting pipe. Ethylene gas conveyed by the ethylene back-blowing pipeline brings triethyl aluminum conveyed into the feeding connecting pipe from the triethyl aluminum conveying pipeline into the reactor, the section, used for being connected with the feeding connecting pipe, of the ethylene back-blowing pipeline is marked as a first pipeline section, and the section, used for being connected with the ethylene back-blowing pipeline, of the feeding connecting pipe is marked as a second pipeline section. The included angle between the material conveying direction in the first pipeline section and the material conveying direction in the second pipeline section is an acute angle. The device has the advantages that dead zones in the pipeline can be effectively eliminated, the pressure feed effect of the triethyl aluminum is enhanced, and then the potential safety hazard problem caused by pipeline blockage is solved.

The application discloses a process method for preparing a nano-limited NaAlH4 hydrogen storage material capable of low-pressure circulation with low energy consumption, and comprises the following preparation steps: (1) pretreating selected two-dimensional carrier materials; (2) placing aluminum powder, sodium, triethylaluminum and an organic solvent into a high-pressure reaction kettle in an argon-filled glove box; (3) dispersing the pretreated two-dimensional carrier materials in the organic solvent, and sealing the reaction kettle; (4) placing the reaction kettle in an ultrasonic machine for ultrasonic mixing and dispersion; (5) vacuumizing the reaction kettle, filling hydrogen into the reaction kettle, heating the reaction kettle at a certain heating rate, and keeping for a period of time; (6) after the reaction is completed, cooling the reaction kettle to room temperature, and discharging the remaining hydrogen pressure; (7) placing the mixture under dynamic vacuum for solvent removal and drying, and obtaining the nano-limited NaAlH4. Through the above method, the pressure and temperature of the loading process are effectively reduced, and the synthesis of NaAlH4 and nano-loading are combined.

The present disclosure provides an alane preparation method, a preparation system and an application thereof that includes: preparing triethylaluminum: taking triethylaluminum as seeds and aluminum and hydrogen as raw materials, synthesizing triethylaluminum via a direct synthesis method; the triethylaluminum that is newly synthesized contains triethylaluminum of an equal amount as the seeds and triethylaluminum configured to perform alane synthesis; preparing alane: performing thermal decomposition on triethylaluminum that is configured to perform alane synthesis, to obtain alane, wherein the newly synthesized triethylaluminum with an amount equivalent to that of the seeds are used as new seeds for the preparation of new triethylaluminum. The present disclosure only consumes aluminum and hydrogen that are necessary for preparing alane during the preparation process, other raw materials can achieve a balance between consumption and production during the production process.

The present application belongs to the technical field of catalyst, and particularly relates to a method for hydrogenation reaction in production of triethylaluminum catalyzed by aluminum hydrogen structure activator. The present application provides a method for hydrogenation reaction in production of triethylaluminum catalyzed by aluminum hydrogen structure activator, which comprises adding triethylaluminum mother liquor and aluminum powder mixture mixed with aluminum hydrogen structure activator in advance into a reaction kettle, heating under stirring, passing in hydrogen and pressurizing, continuously keeping hydrogen passing in during the reaction to ensure that the reaction kettle is in a constant pressure state, and obtaining target product diethylaluminum hydride and hydrogenolysis byproduct ethane after the reaction is completed. The present application provides a hydrogenation reaction with introduction of aluminum hydrogen structure activator, effectively improves the hydrogenation reaction speed and production efficiency, simultaneously reduces by-reactions and production cost, the activator is convenient to add, does not additionally increase process burden, related by-products are easy to remove and do not affect the environment and production safety.

The application is suitable for the technical field of metal source organic synthesis, and provides a trimethylaluminum purification device and process, which comprises a reaction device, a reflux device and a vacuum rectification device, the vacuum rectification device is connected with a shunt device through a pipeline connecting piece, the shunt device comprises a rotating cylinder, a rotating assembly is connected to the side wall of the rotating cylinder, a main flow pipe is installed in the rotating cylinder, one end of the main flow pipe is connected with the vacuum rectification device through a diversion pipe, and the other end of the main flow pipe is positioned and butt-jointed with a shunt assembly through a positioning assembly; by adding high-purity triethylaluminum into trimethylaluminum crude product containing dimethylaluminum chloride, pure trimethylaluminum can be obtained through rectification after reaction, and the purification of trimethylaluminum crude product is realized; in the process of rectifying the trimethylaluminum after reaction, the liquid obtained in the process of rising temperature and the liquid under the temperature stable state can be separated through the shunt device, and the purity of the trimethylaluminum can be further ensured.