摘要:
Disclosed are a spherical carrier for olefin polymerization catalysts, a preparation method therefor and an application thereof, a catalyst and an application thereof, the carrier comprising at least one magnesium-containing compound having a structure represented by formula (1). The spherical carrier for olefin polymerization catalysts of the present invention has a relatively good particle morphology, and substantially no abnormally morphological particles will appear. The provided method may prepare a carrier having a small particle size and greatly expands the particle size range of the preparable carrier. When the catalyst prepared by using the obtained carrier is used for olefin polymerization, polymerization activity is good, substantially no abnormally morphological material is present, and hydrogen response is good.
摘要:
A process for preparing a solid particle-type catalyst component used for olefin polymerization which contains magnesium, titanium, a halogen and an electron donor as essential ingredients, a catalyst component obtained by said process, and a catalyst containing the catalyst component are disclosed.
摘要:
The present invention relates to the technical field of polypropylene materials, and provides a polypropylene microsphere and a preparation method therefor, a 3D printing raw material, and a use. The polypropylene microsphere comprises 0.2 wt%-10 wt% of a structural unit derived from ethylene and 90 wt%-99.8 wt% of a structural unit derived from propylene, wherein a melting heat absorption curve of the polypropylene microsphere is obtained by means of a differential scanning calorimeter (DSC), and a half-peak width (Wm) of the melting heat absorption curve of the polypropylene microsphere is 4-10 °C. According to the polypropylene microsphere of the present invention, the crystallization sequence distribution of the polypropylene microsphere is uniform, and when the polypropylene microsphere is used for 3D printing, 3D printing melting is uniform, a product is good in performance, and the polypropylene microsphere has an industrial application prospect.
摘要:
The present application relates to a carrier for an alkene polymerization catalyst, and a preparation method therefor and an application thereof. The carrier for an alkene polymerization catalyst comprises a magnesium-containing compound and sulfur. The sulfur is at least one of an elemental sulfur, a complex sulfur, and a compound sulfur. The carrier has good particle morphology and a smooth surface, hardly comprises special particles, and has narrow particle size distribution. The catalyst prepared from the carrier has high activity and good sensitivity to hydrogen regulation, and can improve the density of a polymer stack when being used for alkene polymerization.
摘要:
Disclosed is a propylene-butene copolymer. The copolymer contains, based on the total amount of structural units of the copolymer, 90-99 mol% of propylene structural units and 1-10 mol% of butene structural units. The xylene solubles content of the copolymer is less than or equal to 4 wt%, and preferably less than or equal to 3 wt%. The propylene-butene copolymer is substantially free of fraction having a molecular weight lower than 1000. The copolymer has a melt flow index of greater than or equal to 20 g/10 min as measured at 230 °C under a load of 2.16 kg. The propylene-butene copolymer of the present invention has the advantages of a high melt flow index and few xylene solubles, and does not contain a phthalate-type plasticizer, thereby being beneficial to the application thereof in fields such as food and medical and health services.
摘要:
A process for preparing a solid particle-type catalyst component used for olefin polymerization which contains magnesium, titanium, a halogen and an electron donor as essential ingredients, a catalyst component obtained by said process, and a catalyst containing the catalyst component are disclosed.
摘要:
The present invention provides an olefin polymerization catalyst component, a catalyst system, a prepolymerization catalyst composition and an olefin polymerization method, which belong to the field of olefin polymerization catalysts. The catalyst component contains magnesium, titanium, halogen, and an internal electron donor, and the internal electron donor comprises a compound A, a compound B and a compound C, wherein the compound A is selected from a hydroxybenzoyl compound represented by formula (I), the compound B is selected from one or more of an ester compound other than the compound A and an ether compound, and the compound C is selected from an alkoxysilane represented by formula RnSi(OR6)4-n, and wherein, a content of the compound A may be zero. When the catalyst system comprising the catalyst component and a co-catalyst component or a reaction product of the two, or a prepolymerization catalyst composition prepared by further prepolymerization is used for olefin copolymerization, an excellent olefin copolymerization ability is exhibited, and a good polymerization activity, stereospecificity and hydrogen adjustment sensitivity are maintained; in addition, polymer particles that are obtained have a good morphology and a high sphericity, and contain less fine powder.
摘要:
Disclosed in the present invention is a solid component for preparing an olefin polymerization catalyst, and a preparation method therefor and an application thereof. The solid component comprises: (i) a magnesium compound as represented by the following formula (1), (ii) a Lewis base (LB), and (iii) optionally, metal components other than magnesium, wherein the LB is a compound as shown in general formula (II) or an amide compound as shown in general formula (II'). The solid component prepared in the present invention has a better particle morphology, and a catalyst prepared by using the solid component as a carrier is less likely to be crushed, and has better stereostructural orientation in olefin polymerization, particularly propylene polymerization or copolymerization.
摘要:
Disclosed are a catalyst component and a catalyst for olefin polymerization, and an olefin polymerization method. The catalyst component comprises magnesium, titanium, a halogen and an internal electron donor, wherein the internal electron donor comprises a monocarboxylic acid ester compound and a diether compound, and the molar ratio of the monocarboxylic acid ester compound to the diether compound is (0.0035-0.7): 1. By using the catalyst, a polymer having both a high isotactic index and a high melt flow index can be prepared.
摘要:
The invention relates to a dialkoxyl magnesium carrier, which is a product produced by a reflux reaction of magnesium, an alcohol and mixed halogenated agents under an inert atmosphere. The mixed halogenated agents are iodine and magnesium chloride, and the weight ratio between iodine and magnesium chloride is 0.05:1-1:0.01. The dialkoxyl magnesium carrier is spheroid with uniform particle size distribution, excellent particle morphology and high bulk density. A solid catalyst component and a catalyst based on this carrier for olefin polymerization are also provided, and olefin polymers having a wide molecular weight distribution, good stereoregularity, excellent particle morphology and a low content of fine powders can be obtained.