Polypropylene-calcium carbonate filling master batch and preparation method thereof

Abstract

The invention relates to a polypropylene-calcium carbonate filling master batch and a preparation method thereof. The filling master batch includes: 15-25 parts by weight of high rubber phase content polypropylene; and 75-85 parts by weight of calcium carbonate. The high rubber phase content polypropylene is a propylene-ethylene copolymer with a melt mass flow rate of 8-12g/10min, and the calcium carbonate is light calcium carbonate treated by a coupling agent. The preparation method includes: fully drying the calcium carbonate in a 120DEG C dryer, then putting the calcium carbonate into a 120DEG C high speed mixer, adding the coupling agent to conduct high speed stirring so as to activate the surface of the calcium carbonate, adding the high rubber phase content polypropylene, mixing them uniformly, and then carrying out extrusion granulation. The polypropylene composite material modified by the filling master batch prepared by the method can have effectively improved low temperature impact strength, flexural modulus, and load deformation temperature. Also, the preparation method provided by the invention is simple and is beneficial to operation. No expensive elastomer material is contained in the components, so that the material cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of plastic processing, and in particular relates to a polypropylene-calcium carbonate filler masterbatch and a preparation method thereof. Background technique [0002] As a general-purpose plastic, polypropylene is widely used in various fields of production and life. Filling and modifying polypropylene with inorganic rigid particles (such as calcium carbonate, talc, kaolin, etc.) is a common technical means, which can effectively reduce material costs and improve the flexural modulus and load of the material to a certain extent Deformation temperature and other properties, but at the same time it will lead to a reduction in the impact strength of the material. Adding elastomers (such as POE, ethylene-propylene rubber, etc.) to polypropylene can significantly increase the impact strength of the material, but its flexural modulus and load deformation temperature will be greatly reduced, while increasing the...

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Problems solved by technology

[0006] The above inventions and documents use surface-treated inorganic fillers to fill polypropylene to obtain composite materials. Some of them have complicated preparation processes and increased costs, and some can only improve the rigidity or toughness of the material alone.

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