Abstract: A COF@hydromagnesite composite material and its preparation method and application are disclosed. The preparation method of the composite material includes the following steps. Firstly, diisocyanate organic matters are used as a modifier to carry out chemical reaction with the hydromagnesite powder to obtain modified hydromagnesite powder particles. Secondly, tris(4-aminophenyl)amine and 2,5-dihydroxyterephthalaldehyde are adopted as reaction monomers for reacting to obtain the Covalent Organic Framework (COF) material. And finally, taking modified hydromagnesite powder particle as a core and COF as a shell, the COF@hydromagnesite composite material is prepared. The COF@hydromagnesite composite material synthesized by the method disclosed by the disclosure is simple in preparation process, high in stability and good in selectivity, which can be used for adsorption treatment of lead ions in water.

Abstract: The present invention provides an ultrafine modified hydromagnesite powder, and a preparation method and application thereof. The preparation method comprises the following steps: drying ultrafine hydromagnesite, then adding a certain amount of organic dispersion reagent, isocyanate compound and catalyst, stirring at a certain temperature for a period of time, filtering, washing and drying to obtain powder 1; taking the powder 1, a certain amount of organic dispersion reagent and fatty amine, stirring at a certain temperature for a period of time, filtering, washing and drying to obtain the ultrafine modified hydromagnesite powder. The powder is mixed with polyethylene and an auxiliary agent, and extruded for granulation at 160-200° C. to obtain polyethylene composite material. The material has excellent tensile strength and flame retardant property.

Abstract: A method for preparing modified calcined kaolin particles with surface amphiphilicity. The method includes the steps of drying and sieving the calcined kaolin particles, adding ethanol, and stirring to obtain a suspension A, preparing an ethanol solution of a vinyl silane coupling agent, and stirring for a period of time at a certain temperature to obtain a solution B, dripping the solution B into the solution A, and stirring for a period of time at a certain temperature to obtain a suspension C, reducing the temperature of the suspension C, introducing nitrogen, adding a certain amount of sulfhydryl compound, stirring for a period of time at a certain temperature to obtain a suspension D, filtering, washing and drying to obtain the modified calcined kaolin particles.

Abstract: The present invention provides an ultrafine modified hydromagnesite powder, and a preparation method and application thereof. The preparation method comprises the following steps: drying ultrafine hydromagnesite, then adding a certain amount of organic dispersion reagent, isocyanate compound and catalyst, stirring at a certain temperature for a period of time, filtering, washing and drying to obtain powder 1; taking the powder 1, a certain amount of organic dispersion reagent and fatty amine, stirring at a certain temperature for a period of time, filtering, washing and drying to obtain the ultrafine modified hydromagnesite powder. The powder is mixed with polyethylene and an auxiliary agent, and extruded for granulation at 160-200° C. to obtain polyethylene composite material. The material has excellent tensile strength and flame retardant property.

Abstract: A method for preparing modified calcined kaolin particles with surface amphiphilicity. The method includes the steps of drying and sieving the calcined kaolin particles, adding ethanol, and stirring to obtain a suspension A, preparing an ethanol solution of a vinyl silane coupling agent, and stirring for a period of time at a certain temperature to obtain a solution B, dripping the solution B into the solution A, and stirring for a period of time at a certain temperature to obtain a suspension C, reducing the temperature of the suspension C, introducing nitrogen, adding a certain amount of sulfhydryl compound, stirring for a period of time at a certain temperature to obtain a suspension D, filtering, washing and drying to obtain the modified calcined kaolin particles.