Prepn process of naometer calcium carbonate with non-polar surface

Abstract

The preparation process of nano calcium carbonate with non-polar surface includes dispersing nano calcium carbonate particles in hot polypropylene solution homogeneously via high speed stirring; adding reactive monomer as modifier and initiating in-situ reaction of the reactive monomer with initiator under heat action to form macromolecular compatibilizing agent; and crystallizing polypropylene on the surface of nano calcium carbonate by means of the heterogeneous nucleation action of nano calcium carbonate on polypropylene under high speed stirring and slowly lowering temperature to obtain nano calcium carbonate particles with non-polar surface coated with reactive monomer grafted polypropylene. The composite nanometer calcium carbonate/polypropylene material with the nano calcium carbonate of the present invention added has high calcium carbonate dispersivity, raised interface adhesion, etc.

Description

technical field [0001] The invention belongs to the technical field of filler surface treatment, and in particular relates to a preparation method of nano-calcium carbonate with non-polar surface coated with reactive monomer grafted polypropylene. Background technique [0002] As a polymer additive, nano-calcium carbonate has the functions of increment, flame retardancy, reinforcement and toughening, but in order to effectively strengthen and toughen, good dispersion and interfacial bonding must be achieved. Due to the high surface energy of nano-calcium carbonate, the tendency of agglomeration is serious, the polarity difference with polypropylene is large, the compatibility is poor, and the melt viscosity of polypropylene during processing is high, so that nano-calcium carbonate cannot achieve effective dispersion and interfacial bonding. , so it cannot play an effective role in strengthening and toughening in polypropylene. Although the commonly used dispersants can play...

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a kind of preparation method of the nano-calcium carbonate with non-polar surface, after this nano-calcium carbonate is added polypropylene, can improve dispersibility and interfacial cohesiveness simultaneously, to solve the nano-carbonic acid that prior art handles Calcium has high surface energy, serious agglomeration, poor interfacial bonding, and difficulty in achieving nano-dispersion in polymers