Special polyethylene coloring masterbatch for white thin film and preparation method of masterbatch

Abstract

The invention discloses a special polyethylene coloring masterbatch for a white thin film. The special polyethylene coloring masterbatch is prepared from the following raw materials in parts by weight: 20-38 parts of resin, 5-10 parts of polyethylene wax, 0.5-1.5 parts of white oil, 0.5-1.5 parts of zinc stearate, 10-35 parts of titanium dioxide and 25-40 parts of ground calcium carbonate; the resin is a mixture of low-density high pressure polyethylene and linear low-density polyethylene in the ratio of (5-8):3. A preparation method of the special polyethylene coloring masterbatch comprises the steps of weighing the raw materials, namely the mixed resin, titanium dioxide, ground calcium carbonate, polyethylene wax, zinc stearate and white oil, orderly adding the raw materials to a high-speed mixer and mixing thoroughly; after finishing mixing, transferring the mixture to a twin-screw extruder for melt extrusion, and then cooling, drying and pelleting, and finally, packaging. The special polyethylene coloring masterbatch is applied to the plastic industry, and is good in dispersity, high in heat resistance and low in production cost, and meanwhile, capable of improving the mechanical properties and the printing performance of the thin film products, and has outstanding price and quality advantages.

Description

technical field [0001] The invention relates to a polyethylene coloring masterbatch and a preparation method thereof, in particular to a polyethylene coloring masterbatch special for white films and a preparation method thereof, belonging to the field of plastic additives. Background technique [0002] White film has a wide range of applications, and can be used in different fields according to different whiteness, thickness and dispersion, such as: agricultural film, supermarket shopping bags, food packaging bags, etc. In 2012, the national output of plastic films was 10.8935 million tons, a year-on-year increase of 7.61%, of which white films accounted for the majority, and the demand for coloring masterbatches needed to produce white films also increased. The conventional production of white film is generally to mix resin, titanium dioxide, dispersant, coupling agent, etc. through a high-speed mixer, and then directly melt extrude, cool, dry, and granulate. The use of or...

AI Technical Summary

Problems solved by technology

The use of ordinary white masterbatch in the field of film processing will bring two problems: 1. Poor dispersion due to uneven mixing or insufficient melting; 2. High production cost; 3. Poor heat resistance of the masterbatch , leading to yellowing of film products

Especially when the proportion of pigment is large, although high-concentration white masterbatch can be prepared, when it is used in film production, the dispersibility will be seriously affected, and the production cost is high