A kind of preparation method of low n-hexane dissolution polyethylene film

Abstract

The invention relates to a preparation method for a polyethylene film dissolved out by low-normal hexane. The polyethylene film is prepared by blending the following components in parts by weight: 1-2 parts of low-density polyethylene with a melt index of 0.2g / 10min to 0.4g / 10min and 1-4 parts of linear low-density polyethylene with the melt index of 0.9g / 10min-1.0g / 10min, as well as 1-4 parts of metallocene linear low-density polyethylene with the melt index of 0.1g / 10min-0.2g / 10min. The polyethylene film prepared by the preparation method disclosed by the invention has low-normal hexane dissolution rate, and strong mechanical performances, and is capable of satisfying the inner packaging requirements of products such as drugs, material medicines, medical intermediates and chemical products.

Description

technical field [0001] The invention relates to the technical field of new polymer materials, in particular to a polyethylene blend film, in particular to a preparation method of a low-n-hexane elution polyethylene film. Background technique [0002] Pharmaceutical low-density polyethylene film bags are widely used in the inner packaging of pharmaceuticals, raw materials, pharmaceutical intermediates, and chemical products. They have excellent characteristics such as moisture-proof, tear-resistant, no odor, low dissolution, no threshing, and extended product shelf life. . [0003] The basic structure of polyethylene is -(CH 2 -CH 2 )-n, depending on the polymerization method, molecular weight, and chain structure, it can be divided into high-density polyethylene (HDPE), low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE). If the resin raw material is unreasonable due to the unreasonable formula design, it will lead to a high amount of n-hexane diss...

AI Technical Summary

Problems solved by technology

Excessively high n-hexane extractables will affect the safety of medicines and food

[0005] The pharmaceutical packaging industry standard (YBB00072005) requires that the non-volatile residue of n-hexane should not exceed 30mg / 600cm 2 , but at present, the membranes produced by most domestic manufacturers often exceed the standard

In November 2010, at the council of the National Pharmaceutical Packaging Industry Association held in Huangshan, everyone discussed this problem. At present, all domestic manufacturers use domestic raw materials to produce films with a film thickness exceeding 0.08mm, and the unqualified rate of n-hexane dissolution is as high as 98%. % or more, but at present, the thickness of the packaging film of the inner packaging of domestic raw materials mostly exceeds 0.08mm, or even reaches 0.1mm. The problem of n-hexane dissolution is more prominent and has become an urgent problem to be solved.

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