Paper plastic glue-free composite bidirectional stretching polypropylene film and its preparation method

Abstract

The invention discloses a biaxially stretched polypropylene film for paper-plastic glue-free compounding and a preparation method thereof. The film includes a surface layer, a core layer and a core layer which are arranged in sequence and co-extruded, and can be directly combined with paper materials and pre-printed paper. The composite functional layer of the material or the film containing this layer, the upper surface layer is arranged between the surface layer and the core layer, and the next surface layer is arranged between the core layer and the functional layer. The surface layer, the upper surface layer, the core layer, the lower surface layer and the functional layer are co-extruded by two-way stretching according to the corresponding components. The preparation method of the present invention is as follows: the selected raw materials are fed into the extruder to be plasticized into a melt, and the melt is quenched into a thick sheet by casting a cast sheet, and the thick sheet is biaxially stretched into a film, and the film is corona treated or Flame treatment to form the mother film, the mother roll is subjected to aging treatment, and finally cut into film products. The biaxially stretched polypropylene film of the invention can realize the glue-free composite of paper and plastic, and also has the advantages of simple structure, high heat-sealing strength and high peeling strength, which is beneficial to the manufacture and promotion of products.

Description

technical field [0001] The invention relates to a biaxially stretched polypropylene film for paper-plastic glue-free compounding and a preparation method thereof. Background technique [0002] At present, there are mainly the following methods for paper-plastic compounding in industry: one is the glue method (dry compounding and wet compounding), but this method will emit more toxic solvents into the atmosphere and seriously pollute the environment; The second is a solvent-free compounding method, and the initial tack of the composite product obtained by this method is extremely low; the third is a pre-coating method, although this method can use no solvent, but there are many processes and increase costs. In addition, the time dependence of the peel strength of the adhesive layer of the composite product obtained by the above method is obvious. Therefore, in order to overcome the shortcomings of paper-plastic composites in the prior art, Chinese patent ZL03226653.7 disclos...

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Problems solved by technology

However, although this patent discloses a paper-plastic glue-free composite structure, it does not disclose the specific composition of the film layer and its preparation method. In actual use, it is difficult for people to carry out accurate production reproduction. In the paper-plastic composite technology It is difficult to promote and apply in the field

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