12results about How to "High insertion rate" patented technology

The invention belongs to the technical field of polyolefin, olefin products and olefin cascade polymerization reaction, and particularly relates to a cascade polymerization preparation method of branched polyethylene without inert media, the branched polyethylene and application. The invention provides a preparation method of cascade polymerization branched polyethylene without existence of an inert medium, which comprises the following steps: under the catalysis of an oligomerization-copolymerization cascade catalytic system, ethylene is oligomerized to generate even-carbon olefin, and ethylene and even-carbon olefin are copolymerized to prepare branched polyethylene, the even-number carbon olefins comprise C4 or above even-number carbon olefins; the oligomerization-copolymerization cascade catalytic system comprises an oligomerization catalyst and a copolymerization catalyst. According to the method disclosed by the embodiment of the invention, an inert medium does not need to be used, the concentration of the comonomer even-carbon olefin is high, the improvement of the insertion rate of the even-carbon olefin is facilitated, a part of oligomerization products can be simultaneously produced in the process of preparing the branched polyethylene, and the operation efficiency of a device is improved.

The invention provides a raw material pre-dissolving device, which comprises: a tank body, the top of the tank body is provided with an inlet, and the bottom of the tank body is provided with an outlet; the stirring device is arranged in the tank body; the flow guide cover is of a circular truncated cone structure and comprises a top face and a bottom face, the flow guide cover is arranged in the tank body, the top face is close to the top of the tank body, and the diameter of the top face is smaller than that of the bottom face. The flow guide cover is arranged in the raw material pre-dissolving device, liquid in the pre-dissolving tank can collide with the flow guide cover after rotating, the flow guide cover generates acting force in the opposite direction on the liquid, the liquid on the upper portion in the pre-dissolving tank flows downwards, the liquid on the edge in the tank and the liquid in the middle are further fully stirred, and mixing is more uniform.

The invention provides an ethylene copolymer and a preparation method thereof. A catalyst adopted by the preparation method is a metallocene catalyst, and the metallocene catalyst comprises a carrier for the metallocene catalyst, a metallocene compound and a cocatalyst; the carrier is prepared by the following steps: placing silicon dioxide aerogel microspheres in a container for microwave treatment; hot nitrogen is introduced for purging in the microwave treatment; stopping microwave treatment, vacuumizing, and introducing normal-temperature nitrogen for purging to obtain the carrier for the metallocene catalyst; the preparation method comprises a pre-polymerization step and a copolymerization reaction step, the prepolymerization comprises the following steps: mixing a metallocene catalyst and alkyl aluminum, and introducing ethylene for prepolymerization. According to the invention, the silicon dioxide aerogel microspheres are used as the carrier to load the metallocene catalyst, so that the loading capacity of the metallocene compound is improved, the vinyl monomer can be subjected to polymerization reaction on the surface of the silicon dioxide aerogel and in internal pores, the polymerization activity of the metallocene catalyst is improved, and the activity release of the catalyst is stable.

The invention provides a bimetallic compound as well as a preparation method and application thereof. The bimetallic compound provided by the invention is designed by comprising Cr, group IVB bimetallic and a specific ligand; according to the present invention, the catalyst has the excellent catalytic activity, the excellent high-temperature stability and the high alpha-olefin insertion rate in the ethylene polymerization reaction to prepare the polyolefin elastomer, and the polyolefin elastomer obtained through catalysis has advantages of high molecular weight and high 1-octene insertion rate, and can achieve the good rigid-tough balance and the good low-temperature cold brittleness resistance; good application prospects are realized.

The present invention proposes a restricted configuration metallocene compound and a preparation method and application thereof, belonging to the technical field of polyolefin catalysts. The restricted configuration metallocene compound has a structure as shown in the following formula: #imgabs0# or #imgabs1# wherein R1, R2 are independently selected from hydrogen, methyl, ethyl, C3-C6 alkyl or aromatic group; R3 is independently selected from methyl, ethyl, C3-C6 alkyl, aromatic group or adamantyl group; R4-R7 are independently selected from hydrogen or methyl group; M is independently selected from titanium or zirconium. The CGC catalyst of the above-mentioned novel structure is mainly used for olefin polymerization and copolymerization. By adjusting the substituent, a functional group with weak coordination and steric effect is introduced on the bridge, which is convenient for controlling the spatial effect and electronic effect of the metal center, improving the stability of the catalyst and the insertion rate of α-olefins, and then better regulating the distribution of polymer molecular weight and copolymerization performance, improving the metallocene copolymerization ability and polymerization reaction temperature, and having important significance for producing high molecular weight copolymerized olefins.

The present invention discloses a preparation method and application of an OP bidentate imine vanadium complex, and belongs to the technical field of olefin polymerization catalysts. The vanadium complex provided by the present invention is used as a main catalyst, and under the activation of a small amount of a co-catalyst, can catalyze the homopolymerization of ethylene, and has the advantages of high catalytic activity, good thermal stability, long service life, and applicability to a variety of solvent systems; it catalyzes the copolymerization of ethylene and α-olefins, and can obtain a polymer product with a high comonomer content with ultra-high activity catalysis; at the same time, the metal complex can also catalyze the copolymerization of ethylene and a hydroxyl-containing polar monomer to obtain a functionalized polyolefin product.

The application discloses a kind of cyclic olefin multi-block copolymer and its preparation method and application, it includes the following steps: S1, solvent, cocatalyst, cyclic olefin, chain shuttle agent are mixed to obtain mixed solution;Add olefin again;S2, catalyst I and catalyst II are added in step S1 and carry out polymerization reaction, post-processing is obtained cyclic olefin multi-block copolymer;Wherein, the structural formula of catalyst I and catalyst II are as follows:Wherein, M is titanium, zirconium or hafnium;X is halogen, C 1～10 Alkyl of C 1～10 Alkoxy or C 1～10 Alkylamine;R1 And R2 It is independently selected from C 1～10 Aliphatic group, substituted or unsubstituted C 6～15 Aromatic group;R3, R4, R5 And R6 Selected from C 1～10 Alkyl or C 6～15 Aromatic group.The cyclic olefin multi-block copolymer prepared by selecting specific structure catalyst I and catalyst II has cyclic olefin / olefin chain soft segment (low T g1 ) with low insertion rate and cyclic olefin / olefin chain hard segment (high T g2 ) with high insertion rate;The obtained material can solve the brittleness problem of COC plastic, and also can obtain COC elastomer.

This invention relates to the field of polyethylene technology, specifically to a polar-modified high-purity polyethylene, its preparation method, and its applications. The method includes the following steps: In the presence of a nickel phosphonate catalyst, ethylene is polymerized with a polar monomer to obtain polar-modified polyethylene. The nickel phosphonate catalyst has the structure shown in Formula C. This invention, by employing a novel nickel phosphonate catalyst, improves the catalyst's tolerance to polar comonomers, increases the insertion rate of polar groups, and prepares polar-modified high / ultra-high molecular weight polyethylene, thereby improving the properties of polyethylene.

The invention relates to a metal compound containing a dihydronaphthalene structure as well as a preparation method and application of the metal compound. The metal compound containing the dihydronaphthalene structure has a structure as shown in a formula (I). The metal compound containing the dihydronaphthalene structure provided by the invention takes dihydronaphthalene as a skeleton, has rigidity of an aromatic ring and flexibility of a naphthenic base, and is complexed with a fourth pair (IVB group) metal to form a stable complex. The metal compound has the advantages of being easy to prepare, high in activity, good in copolymerization performance and the like, a catalyst composition formed by the metal compound is suitable for preparing a polyolefin material through olefin slurry polymerization, and an obtained polymer has the advantages of being good in form, low in cost, high in molecular weight, low in extraction rate, high in bulk density and the like.

This invention relates to the field of polyolefin technology, specifically to a phosphonic sulfonic acid ligand for olefin polymerization, a nickel phosphonic sulfonate catalyst, its preparation method, and its application. The phosphonic sulfonic acid ligand structure is shown in Formula L, and the nickel phosphonic sulfonate catalyst is formed by a phosphonic sulfonic acid ligand and an organonitrile complex. The catalyst provided by this invention is a Drent-type catalyst composed of benzenesulfonic acid and 1,3,2-diazaphosphonic acid, which is resistant to polar comonomers and facilitates the preparation of high molecular weight polyolefins with biased polarity.

The invention provides a polyolefin elastomer and a preparation method thereof, and the preparation method comprises the following steps: in a solvent, carrying out a copolymerization reaction of ethylene and alpha-olefin by using a metallocene catalyst to obtain the polyolefin elastomer, the structural formula of the metallocene catalyst is shown in the specification, wherein M is selected from Ti or Zr; x1 and X2 are each independently selected from halogen or alkyl having 1 to 6 carbon atoms, and X1 and X2 are the same or different; r1 to R4 are respectively and independently selected from hydrogen or alkyl with 1 to 2 carbon atoms, and R1 to R4 are the same or different. According to the preparation method of the polyolefin elastomer, the polymerization temperature is relatively high, the catalyst has high temperature resistance, the solubility of a polymer in a solvent is remarkably improved, the viscosity of a solution system is reduced, pipeline blockage caused by polymer precipitation is prevented, and subsequent product separation is facilitated. The prepared polyolefin elastomer is narrow in molecular weight distribution and high in alpha-olefin insertion rate, and has important significance for industrialization of polyolefin elastomers.

The invention relates to a metal organic complex as well as a preparation method and application thereof. The metal organic complex has the structural characteristics as shown in the following formula I. The metal organic complex has higher catalytic activity on olefin polymerization. Formula I.