6results about How to "High insertion rate" patented technology

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 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.

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.