Bi-axially oriented static polyolefin film and preparation method thereof

Abstract

The invention discloses a bi-axially oriented static polyolefin film and a preparation method thereof. The bi-axially oriented electrostatic polyolefin film adopts a five-layer structure comprising an upper surface layer, three core layers and a lower surface layer which are distributed in sequence, wherein the upper surface layer is prepared from components as follows: 93-97 parts of propylene copolymers and 3-7 parts of an anti-adhesion agent; each core layer is prepared from components as follows: 99-100 parts of linear low-density alkene copolymers and 0.1-1 part of a slipping agent; the lower surface layer is prepared from components as follows: 88-97 parts of propylene copolymers, 2-7 parts of the anti-adhesion agent and 1-5 parts of an antistatic agent. According to the technical scheme, transparency and thermal sealing property of a product can be remarkably improved, and by means of matching with a static sealing mode, materials can be effectively utilized, waste of leftover materials is reduced, and environment is not polluted; the bi-axially oriented static polyolefin film can meet packaging requirements of high-speed packaging and static sealing, keeps the thermal sealing property, can be applicable to traditional thermal sealing and meets requirements of different packaging modes.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyolefin biaxially stretched electrostatic film and a preparation method thereof. Background technique [0002] Polyolefin heat-shrinkable film (POF) is generally made of PP and PE co-extruded compound, which contains the advantages of polyethylene and polypropylene, and its performance is better than polyethylene film and polypropylene film, such as high transparency, low temperature resistance , high strength, comprehensive performance of rubbing resistance. POF films are widely used in industrial and retail industries for bundling and packaging applications of various products such as food, cosmetics, pharmaceuticals, and electronics. POF film generally has a 3-5 layer co-extrusion structure, and the biaxial stretching process mainly consists of the following processes: batching and mixing, extruding from an extruder, extruding through a co-extrusion die to fo...

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Problems solved by technology

[0003] In the prior art, as the patent No. CN 103085415A discloses a co-extruded polyolefin biaxially stretched film and a preparation method thereof, the film prepared by this method has the characteristics of high strength and high stiffness, which helps Due to the thinning and lightening of the film, however, because the surface layer of the film is generally a polymer material, the surface resistance volume is generally greater than 10 to the 12th power, and it is prone to poor sealing during high-speed electrostatic sealing, resulting in high cost. and the problem of polluting the environment

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