Functional master batch suitable for thin-wall high-length-diameter-ratio polypropylene cable tie as well as preparation method and application of functional master batch

Abstract

The invention discloses a functional master batch suitable for a thin-wall high-length-diameter-ratio polypropylene cable tie as well as a preparation method and application of the functional master batch. The functional master batch comprises an ethylene-octylene copolymer, a first functional aid and a second functional aid, the first functional aid comprises a lubricant, an antioxidant and a nucleating agent, and the second functional aid comprises at least one of an ultraviolet light absorber, an antistatic agent and an anti-copper agent; the functional master batch is prepared by mixing, extruding and granulating all the components, the processing temperature is controlled so that the solid ethylene-octylene copolymer is partially melted, and in the prepared functional master batch, the ethylene-octylene copolymer coats other components; the master batch can be directly mixed with polypropylene to be subjected to injection molding to form the thin-wall polypropylene cable tie with the high length-diameter ratio, multiple times of hot processing of the polypropylene can be avoided, the auxiliary powder is well dispersed in a system in the injection molding process, and the system is endowed with excellent low-temperature resistance, mechanical (mechanical) performance and other functions.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and processing, in particular to thin-walled high aspect ratio plastic products, in particular to a functional masterbatch suitable for thin-walled high aspect ratio polypropylene cable ties, and a preparation method and application thereof. Background technique [0002] Thin-walled plastic molding technology is a relative concept, and the definition in the industry is usually divided into three situations: [0003] (1) Injection molding with a ratio of flow length to thickness L / T above 100 or 150 is a thin-walled high aspect ratio injection molding, L is the flow length from the melt entering the mold to the farthest point of the cavity where the melt must be filled, T is the corresponding average wall thickness; [0004] (2) The thickness of the molded plastic part is less than 1mm, and the projected area of ​​the plastic part is 50cm 2 The above injection molding method; [0005] ...

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Problems solved by technology

[0009] However, due to the unique structure of polypropylene itself, it has the defects of poor low temperature toughness and low notched impact strength, it is not resistant to ultraviolet radiation, and is prone to static electricity accumulation; at the same time, in the process of manufacturing thin-walled high aspect ratio cable ties Among them, in order to improve the fluidity of polypropylene and shorten the molding cycle, it is usually necessary to add a nucleating agent in the formulation design to increase the crystallization rate of polypropylene and reduce the crystal size, and the addition of nucleating agent can improve the crystallization behavior of polypropylene At the same time, it also brings the problem that the low-temperature toughness of polypropylene is worse and the notched impact strength is lower; in addition, because the preparation of the cable tie needs to prepare the polypropylene composition first, and then injection molded into the cable tie, that is, the polypropylene needs to go through Multiple thermal processing, there is a potential risk of reducing the physical and mechanical properties of thin-walled high aspect ratio polypropylene cable ties, which limits the application of polypropylene cable ties

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