Filling masterbatch for plastic films and preparation method thereof

Abstract

The invention belongs to the field of plastic film manufacture and relates to a filling masterbatch for plastic functional films and a method for preparing the masterbatch. The plastic film filling masterbatch comprises the following components by weight: main ingredients: 70 to 90 parts of calcium carbonate powder body and 10 to 30 parts of carrier resins, and auxiliary ingredients of dispersants for pretreatment (polyethylene wax), wherein the calcium carbonate powder body can satisfy the requirements that the grain size of the powder body is not larger than 5 mu m, average grain size is (2.5-0.5) mu m to (2.5+0.5) mu m, the moisture of the powder body is not larger than 0.1%, the whiteness of the powder body is 95 to 100%, and the volatilization content of micromolecule substances of the powder body is not larger than 0.2%; the carrier resins should satisfy the requirement that melt mass flow rate is 40 to 80 g / 10 min; the micromolecule volatilization content of the dispersants for pretreatment is not larger than 0.2%, and the weight part of the dispersants for pretreatment is 1 to 2% of the weight part of calcium carbonate powder. The preparation method comprises the steps of strictly choosing the main ingredients and the auxiliary ingredients and specially processing the main ingredients of the calcium carbonate powder body. When the filling masterbatch is manufactured, the temperature of every temperature zone of an extruding machine is controlled not to exceed 170 DEG C to manufacture the recyclable filling masterbatch for functional films, which has high concentration, high addition rate and high dispersity.

Description

technical field [0001] The invention relates to the field of plastic film manufacture, in particular to a filler masterbatch used in the manufacture of functional plastic films and a preparation method. [0002] Background technique [0003] In 2010, my country produced and consumed 80 million tons of plastics, with an annual growth rate of 8%. According to the calculation that 10% of various non-metallic ore powder materials need to be filled in the production of plastics in the plastics industry, the calcium carbonate filled will reach more than 70%. In 2010, the calcium carbonate used as filling materials in my country's plastics industry was 5.6 million tons. Synthetic resin is used to make plastic film, and 3 tons of petroleum are consumed for every ton of synthetic resin produced. Excluding the impact of substitution caused by density differences, in 2010 my country's plastics industry saved 16.8 million tons of oil by using calcium carbonate as a filler. However, l...

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Problems solved by technology

[0006] The purpose of the present invention is to provide enterprises with a filling masterbatch for manufacturing plastic films and its preparation method for the difficult problems in the dispersion of fillers in the manufacture of plastic films, especially high-transparency films, in my country's plastic production industry.

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