6 results about "Aluminium alkyl" patented technology

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.

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 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 relates to an external electron donor composition and its application. The composition is prepared by mixing the components of raw materials; wherein the raw materials include an alkylaluminum compound and two or more external electron donors, and the molar ratio of the two or more external electron donors to the alkylaluminum compound is 1:(0.01–0.1). One embodiment of the external electron donor composition of this invention can be used to prepare a catalytic system for propylene polymers, achieving a comprehensive optimization of high reactivity and high polymer performance.

The present invention relates to the field of olefin polymerization catalyst technology, and in particular, to a catalyst system, use thereof, and an olefin polymerization method. The catalyst system comprises: (1) a solid catalyst component, comprising titanium, magnesium, a halogen, and an internal electron donor, wherein the internal electron donor is a non-plasticizer compound; (2) an alkylaluminum compound, serving as a co-catalyst; and (3) an external electron donor, wherein the external electron donor is a silane compound of formula (I). The catalyst system can improve the polymerization activity and hydrogen regulation sensitivity of Z-N catalysts, and is particularly suitable for the polymerization of CH2=CHR olefins.

The application discloses an ONN-Ti / ONN-Cr bimetallic co-loaded heterogeneous catalyst and a method for preparing bimodal ultra-high molecular weight polyethylene (UHMWPE) in one pot. The catalyst uses inorganic oxide pretreated by alkyl aluminum as a carrier, and ONN-Ti catalyst for generating high molecular weight polyethylene components and ONN-Cr catalyst for generating low molecular weight polyethylene components are co-anchored on the surface of the same carrier. The carrier is selected from SiO2, MgO or ZnO, the pretreatment agent is selected from MAO, i Bu3Al or AlEtCl2. By adjusting the loading molar ratio of ONN-Ti and ONN-Cr, bimodal UHMWPE can be prepared in one pot in a single reactor. When the loading molar ratio of ONN-Ti / ONN-Cr is 1 / 1, the obtained polyethylene has a bimodal molecular weight distribution, and the overall weight average molecular weight M w is 1446*10 3 g·mol ‑1 , the molecular weight distribution D is 6.3, the high molecular weight component M w is 2180*10 3 g·mol ‑1 , and the low molecular weight component M w is 179*10 3 g·mol ‑1 ; the tensile strength of the bimodal UHMWPE material can reach 50 MPa, the elongation at break can reach 1400%, and the complex viscosity is lower than that of unimodal UHMWPE. In addition, the application can also improve the reactor fouling in slurry polymerization and control the morphology of the obtained polymer particles by co-loading, and is suitable for efficient preparation of bimodal UHMWPE.