96results about How to "High hydrogen sensitivity" patented technology

The invention discloses a preparation method of polypropylene with high melt strength. The method includes i) a step of, under the action of a Ziegler-Natta catalyst containing a silane type external electron donor, subjecting propylene or propylene with other alpha-olefin to polymerization to obtain a polymer A having a melt mass flow rate of 0.01-0.4 g/min, with a hydrogen concentration being not more than 400 ppmV; ii) a step of adding a 1,3-diether type external electron donor and premixing the 1,3-diether type external electron donor and the polymer A; iii) a step of, under the existence of hydrogen and the premixed materials in the step ii), subjecting the propylene or the propylene with other alpha-olefin to polymerization to obtain a polymer B having a melt mass flow rate of 1.0-60 g/10min; and a step of preparing polypropylene C with high melt strength comprising the polymer A and the polymer B. The melt mass flow rate of the polypropylene C is 0.8-15 g/10min. The preparation method is simple and feasible and is convenient to operate and prone to industrial production. High-performance products with high melt strength and wide molecular weight distribution can be prepared by the method. The method has wide application prospect.

A catalyst active ingredient, its production and catalyst containing it are disclosed. The ingredient consists of magnesium 12.0-18.0 proportion, titanium 4.0-8.0 proportion, alkoxy 1.1-11.0 proportion, silicon 0.5-2.5 and halogen 55.0-75.0 proportion. The process is carried out by preparing magnesium alcoholate slurry, reacting it with electron, pre-carried titanium reacting and carried titanium reacting. It has higher catalytic activity and melt index, better physical mechanical and copolymer performances and hydrogen selectivity, and homogeneous grain distribution.

The invention belongs to polyethylene catalysts, and particularly relates to a titanium fluoride modified load type chrome alum double-active center catalyst. The titanium fluoride modified load type chrome alum double-active center catalyst comprises an inorganic carrier and loaded active components and modified components. The active components comprise chromium oxides and vanadium oxides, and the modified components comprise fluorine and titanium. According to the catalyst, the content and distribution of comonomers are improved, the number of the comonomers inserted into a low molecular weight end is reduced, the number of the comonomers inserted into a high molecular weight end is increased, and therefore more chalaza molecules can be formed easily, and polyethylene products with better performance are prepared. Meanwhile, the catalyst has the advantages of being high in activity, sensitive in hydrogen regulation response performance and the like. The invention further provides a preparation method of the catalyst. The inorganic carrier is firstly loaded with one of the modified components, and then loaded with the rest of the components, the process is reasonable, and industrial production is easy.

The invention discloses a catalyst component used for an ethylene polymerization reaction, a preparation method thereof and a catalyst prepared therefrom. The catalyst component comprises a magnesium alcohol adduct, a titanium compound, acrylate and a derivative thereof, an organic aluminum compound, a monoester compound and a free radical initiator. The catalyst is high in mechanical strength and hydrogen regulation sensitivity and is not liable to break during polymerization. A prepared polyethylene powder material is high in stacking density, is very concentrated in particle size distribution and is less in contents of thick powder and fine powder.

The invention provides an olefin polymerization catalyst, as well as a combined catalyst containing the same and an application thereof. The olefin polymerization catalyst contains reaction products of the following raw materials: a composite carrier prepared by spray-drying magnesium halide and silicon dioxide, at least one compound selected from a group composed of dihydric alcohol sulphonate compounds, at least one compound selected from a group composed of a monohydric fatty group carboxylic ester compound, a dihydric fatty group carboxylic ester compound, a monohydric aromatic carboxylic ester compound, a dihydric aromatic carboxylic ester compound and a diether compound, and a titanium halide compound. The combined catalyst contains the olefin polymerization catalyst, an alkyl aluminium compound and the like. The olefin polymerization catalyst adopts two kinds of internal electron donor compounds, and can guarantee the stereoregularity of a prepared polymer while guaranteeing the catalyst activity.

The invention provides a carrier for an ethylene polymerization catalyst and a catalyst of the carrier. The carrier comprises reactants of the following components: magnesium chloride/gallic acid derivatives/epoxy compounds with carbon-carbon double bonds/alcohol compounds/radical initiators. A mixed solution of the components is initiated by the radical initiators in the process of warming, and the carbon-carbon double bonds in a system can generate a polyreaction, so that the carrier with narrow particle size distribution and doped with polymers can be separated out. The polyethylene catalyst prepared through the carrier not only has the characteristic of narrow particle size distribution but also is high in hydrogen adjustment sensibility; the particle size distribution of obtained polymeric powder materials is particularly intensive, and less fine powder is generated.

The present invention relates to a high hydrogen response olefin polymerization catalyst component and a preparation method thereof, and an olefin polymerization method. According to the present invention, an organic silane compound and a diether internal electron donor compound are simultaneously introduced during a catalyst component preparation process, and the prepared catalyst component is used for polymerization, particularly for propylene polymerization, such that the hydrogen regulation performance of the catalyst system is increased, the particle morphology of the polymer is improved, and the original isotacticity and other high excellent performances of the catalyst system can be well maintained. In addition, the method of the present invention is suitable for a slurry polymerization method, a bulk polymerization method, a gas phase method, and a plurality of polymerization processes.

The invention discloses a catalyst component for olefin polymerization. The catalyst component contains titanium, magnesium, halogen and an internal electron donor compound, wherein the internal electron donor compound comprises an amino ester compound shown as general formula I in the description. A catalyst with excellent combination property can be obtained by adopting a novel internal electrondonor system, satisfactory polymerization yield can be realized when the catalyst is applied to propylene polymerization, hydrogen response of the catalyst is improved, the stereospecificity is higher, and development of polymers with different grades is facilitated.

The invention relates to a catalyst for ethylene polymerization. The catalyst comprises: A. a titanium-containing solid catalyst component, which is obtained by: dissolving magnesium halide in an organic epoxy compound and an organic phosphorus compound, then adding an electron donor compound to form a uniform solution, in the presence of an assistant precipitation agent, mixing the solution with a halide of titanium or its derivative, and conducting washing and drying to obtain a solid a; reacting a silicon compound with the solid a in an inert solvent, and performing washing and drying; and B. an organic aluminum compound with a general formula of AlRnX3-n, wherein n is alkyl with a hydrogen or carbon atom number of 1-20, X is an halogen atom, and n is an integer larger than 0 and smaller than or equal to 3. The catalyst component can have high catalyst activity and high hydrogen regulation sensitivity when it is applied to ethylene polymerization, and the obtained polymer can have a low fine powder content. The catalyst is suitable for slurry polymerization or gaseous polymerization of ethylene, and is especially suitable for an ethylene gaseous fluidized bed polymerization process with the catalyst fed in a slurry form.

The invention relates to a catalyst composition used in an olefin polymerization reaction. The catalyst composition includes a solid catalyst component A, aluminum alkyl B and an external electron donor halogen-free malonate C, wherein the solid catalyst component A includes at least one of magnesium, titanium, a halogen and an internal electron donor containing lone pair electrons, such as a dialcohol ester compound (I); and the external electron donor C is a halogen-free malonate compound represented as the general formula (II). When the olefin polymerization reaction is carried out with the solid catalyst component A in the presence of the external electron donor C, the solid catalyst component A is very high in activity and especially is greatly enhanced in hydrogen-regulation sensitivity. In addition, some molecular weight distributions of the catalyst become wider and the external electron donor has a high-temperature self-quenching function.

The invention relates to an F-P interference type multipoint measurement hydrogen sensor based on an FBG interrogator. The F-P interference type multipoint measurement hydrogen sensor based on the FBGinterrogator comprises the FBG interrogator, a long-distance single-mode transmission optical fiber, an arrayed waveguide grating, an FP sensing head and a PC; the FP sensing head is composed of a hollow optical fiber, a PDMS (polydimethylsiloxane) thin film and a Pt/WO3 (platinum-loaded tungsten trioxide ) hydrogen-sensitive material; when hydrogen concentration is increased, the Pt/WO3 hydrogen-sensitive material reacts with hydrogen to release heat, volume of the PDMS thin film is expanded, length of an air-filled cavity is reduced, an interference spectrum of the FP sensing head can drift, then reflected light intensity of the arrayed waveguide grating is changed, and measurement on the hydrogen concentration can be realized by detecting change of the reflected light intensity by virtue of the PC. The F-P interference type multipoint measurement hydrogen sensor provided by the invention is simple in structure and high in sensitivity and can measure multiple points at the same time.

The invention relates to a propylene polymer and a preparation method thereof. The MW of the polymer is 1.6-3.1*10<5>. The MW/Mn of the polymer is 3-15. The isotactic index of the polymer is 96.2-99.5%. The melt flow rate and the isotactic index satisfy the following formula: 101.0-1.1ln(x)-0.5<=y<=101.0-1.1ln(x)+0.5, wherein the y is the isotactic index and the x is the melt flow rate measured according to ASTM D1238-99 with the unit of g/10min. The isotactic index of the propylene polymer provided by the invention is higher than that of polypropylene in the prior art with the same melt index as the propylene polymer provided by the invention.

The invention relates to a catalyst ingredient used for ethylene polymerization or copolymerization. The catalyst ingredient is characterized in that: the catalyst ingredient is obtained via loading a magnesium/titanium-containing solid material with at least one inorganic titanium compound, at least one organic titanium compound, at least one electron donor compound, and at least one activator. The magnesium/titanium-containing solid material is prepared by following steps: a magnesium compound is dissolved in a solvent system containing an alcohol compound, an organic epoxy compound, and an organic phosphorous compound so as to obtain a uniform solution; a halide of transition metal titanium or a derivative thereof is added for mixing; and the magnesium/titanium-containing solid material is obtained via precipitation in the presence of a precipitation accessory ingredient mixture. The magnesium/titanium-containing solid material is selected as a carrier, so that when the catalyst ingredient is used for ethylene polymerization, catalyst activity and hydrogen response are relatively high; an obtained polymer is low in fine powder content; the catalyst ingredient is suitable for ethylene slurry polymerization or gas phase polymerization, and is especially suitable for ethylene gas phase fluidized bed polymerization technology in which the catalyst is charged in a slurry form.

The invention relates to an olefin polymerization method. The method comprises steps as follows: a hexane solution of triethyl aluminum, a hexane solution of cyclohexyldimethoxymethylsilane and a catalyst are sequentially added to a high-pressure reactor under the protection of nitrogen, the high-pressure reactor is closed, 1.5-8.0 L of hydrogen and liquid olefin are added, the components are heated to 60-80 DEG C to react for 1-2 h, cooled, subjected to pressure release, discharged and dried, and polymers are obtained. According to the olefin polymerization method, a supporter and the catalyst are improved, so that when the catalyst prepared from the supporter is used for polymerization of olefin, especially, polymerization of propylene, activity and hydrogen regulation sensitivity of the catalyst can be improved, particle morphology of obtained polymers is good, bulk density of the polymers can be reduced, and no special-shaped materials are produced basically.

The invention provides a catalyst component for vinyl polymerization. The catalyst component comprises Ti, Mg, halogens and 1-99% of olefin polymers. The catalyst component for vinyl polymerization not only has the characteristics of high activity, high bulk density, low breaking rate of polymeric particles and low fine powder content, but also has good hydrogen regulating performance.

The invention discloses a method for preparing a solid catalyst component for an olefin polymerization reaction. The method comprises the following steps of dissolving a magnesium compound in a solvent system containing a hydrocarbon compound and an alcohol compound, mixing a titanium compound and the above solution at a temperature of -40 to 0 DEG C, adding an electron donor compound into the mixture at a temperature of 50-150 DEG C, and carrying out washing by an inert diluent to obtain the solid catalyst component. The used electron donor is at least one of diol ester compounds shown in the general formula (I). The catalyst system provided by the invention has greatly improved polymerization activity, hydrogen response and stereospecificity. Through the solid catalyst component and the catalyst, a polymer having a high fusion index and high isotacticity is obtained. Compared with the prior art, the solid catalyst component has the advantages that if polymer melt indexes are the same, in other words, hydrogen response is the same, isotactic indexes are improved, and if polymer isotactic indexes are the same, the polymer melt indexes are improved, in other words, the hydrogen response is improved.