39 results about "Zirconocene dichloride" patented technology

Linear low density polyethylenes (LLDPEs) that have relatively high melt index ratios (MIR) and relatively high melt strength (MS) are described. This combination of melt properties is achieved by a substantially non-blended LLDPE. Catalysts used to produce these polyethylenes are generally a blend of bridged bisindenyl zirconocene dichlorides, where one zirconocene contains saturated indenyls and the other unsaturated indenyls.

The invention relates to a photosensitive Zr-B-Si-C ceramic precursor and an in-situ preparation method thereof. The method is as follows: mix methyl vinyl dichlorosilane and borane dimethyl sulfide evenly, then add metal sodium for dechlorination to obtain methyl vinyl borosilane; mix chloromethyl trichlorosilane, methyl chloride Methyldichlorosilane and dichlorozirconocene are mixed evenly, then metal magnesium is added for the first heat preservation reaction, and then a reducing agent is added for the second heat preservation reaction to obtain polyzirconium carbosilane; methylvinyl borosilane and polyzirconium Carbosilane is mixed uniformly to obtain vinyl Zr-B-Si-C alkane; vinyl Zr-B-Si-C alkane is mixed with mercaptopropionate evenly, and then a photoinitiator is added to initiate a polymerization reaction to obtain the ceramic Precursor. The invention solves the problems of high viscosity, large thermal stress, and attenuation of mechanical properties of structural parts in traditional light-curing systems, and provides high-quality raw materials for light-curing 3D printing ultra-high temperature ceramic structural parts.

The invention relates to a preparation method of a compound, in particular to a method for preparing liquid anaerobic polyzirconocarbosilane, relates to a preparation method of a compound, and provides a method for directly preparing the liquid anaerobic polyzirconocarbosilane through binary or ternary polymerization of chloromethylsilane and zirconocene dichloride. The method comprises the steps as follows: 1), under the protection of an inert atmosphere, the chloromethylsilane and the zirconocene dichloride are mixed simultaneously and dissolved in absolute ether; 2), magnesium metals are added into a mixed solution obtained in the step 1) in batches for reaction; 3), under the protection of the inert atmosphere, a reducing agent is added in batches into a reaction mixed material obtained in the step 2) for reaction; and 4), under the protection of the inert atmosphere, an organic solvent is added into a reaction mixed material obtained in the step 3), an organic phase is extracted, standing is performed, an upper-layer organic phase is separated, the organic solvent is removed through filtration, and the liquid anaerobic polyzirconocarbosilane is obtained.

A method for synthesizing an ultra-high temperature resistant ZrC / SiC composite ceramic precursor, comprising the following steps: (1) under the protection of an inert gas atmosphere, dissolving zirconocene dichloride in an organic solvent, stirring and adding an organolithium compound, a compound (2) Under the protection of an inert gas atmosphere, add the halosilane monomer to the active component a obtained in the stirring step (1), and a polymerization reaction occurs to obtain component b, drop The reaction is terminated by adding a terminator, concentrated by filtration, purified by precipitation, and dried in vacuum to obtain the precursor of ultra-high temperature resistant ZrC / SiC multiphase ceramics. The present invention starts from the monomer and polymerizes step by step, the product chain length is controllable and uniform, and ZrC / SiC multi-phase ceramics with high purity and good uniformity can be further prepared; the two-step process is simple and can be reacted at normal temperature and pressure , the conditions are easy to control, the raw materials are easy to obtain, and are suitable for large-scale production.

The invention discloses a method for preparing quinoline compounds by catalyzing zirconocene dichloride. The method uses 3-butyne-2-ketone compounds and anthranilobenzenethiol compounds as raw materials, As a catalyst, L-phenylalanine, tyrosine, etc. are used as catalyst ligands, N,N-dimethylformamide is used as a solvent, and elemental iodine, hydrogen peroxide, tert-butanol peroxide, etc. are used as oxidants, The quinoline compounds can be prepared efficiently and in high yield. The catalyst used in the present invention is low in cost, stable to air, mild in reaction conditions, and simple in operation. After the reaction is completed, the product is extracted and washed and separated by simple column chromatography to obtain quinoline compounds, which are quinoline compounds The preparation of opens a low-cost and high-efficiency way, and has broad application prospects.

The invention discloses an unsaturated compound hydrosilylation reaction taking metallocene as a catalyst. The catalyst comprises a metallocene coordination compound and metal powder, the molar ratioof the metallocene coordination compound to the metal powder is 1:1-1:3, the metallocene coordination compound is titanocene dichloride or zirconocene dichloride, and the metal powder is any of samarium, magnesium and aluminum or zinc. The prepared catalyst is a non-precious metal catalyst and has the advantages of low cost, simplicity in operation and the like, a new variety is increased for a hydrosilylation reaction catalyst, and the catalyst has excellent catalytic effects on hydrosilylation reaction of unsaturated olefins, can catalyze addition reaction of olefin, ketone and hydrogen-containing silane and is wide in applicability.

The invention provides a polymer cement-based waterproof coating. The polymer cement-based waterproof coating comprises a composition A and a composition B. The composition A is prepared from nonionicvinyl acetate-ethylene copolymer emulsion, nonionic emulsified asphalt and zirconium dibutyl zirconocene dichloride; the composition B is prepared from heavy calcium powder, chromic sulfide and JX-Iwaterproof agent, and the weight ratio of the composition A to the composition B is 1:(1-2.5). The invention further provides a preparing method of the polymer cement-based waterproof coating. The preparing method comprises the steps of firstly, uniformly mixing all the components of the composition A, continuously stirring the components, adding a uniform mixture of the composition B, and continuing to uniformly stir the mixture to obtain the polymer cement-based waterproof coating. After being molded and cured, the polymer cement-based waterproof coating is free of gaps, cracks or lap joint,is good in weather fastness, does not get cracked at minus 25 DEG C or deform at 100 DEG C, and has good surface hydrophobicity. Waterproof components permeating a base layer have the performance of enhancing self-waterproofing for the base layer; meanwhile, the function of self-restoring tiny fractures of the base layer is achieved.

The invention relates to a ZrC / SiC / C composite ceramic precursor material and a preparation method thereof; the precursor is pyrolyzed and converted into a composite ceramic at a temperature of 1600 DEG C, the zirconium content in the composite ceramic is not less than 50 wt%, and the silicon content in the composite ceramic is not less than 10 wt%. The preparation method of the precursor is characterized in that polysilylacetylene, zirconocene dichloride and n-butyllithium are subjected to a one-pot reaction under anhydrous and anaerobic conditions to synthesize the precursor, the zirconocenedichloride is used as a zirconium source, the polysilylacetylene is used as a silicon source, and the n-butyllithium is added at a low temperature to carry out a further reaction to prepare the precursor. The polymer precursor prepared by the method is expected to be used as a dipping matrix of a ceramic-based composite material and a carbon / carbon composite material so as to improve the ultrahigh-temperature oxidation resistance of the ceramic-based composite material and the carbon / carbon composite material.