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Low-haze multi-layer co-extrusion two-way stretching polyamide film and preparation method

A polyamide film, multi-layer co-extrusion technology, applied in the field of packaging industry, can solve the problem of high haze of polyamide film, achieve the effects of low haze, improve toughness, and improve production yield

Inactive Publication Date: 2010-06-09
SHANGHAI ZIDONG CHEM MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of this invention is to provide a multi-layer co-extrusion biaxially stretched polyamide film with low haze, to solve the high problem of haze of existing polyamide film
[0007] Another object of the present invention is to provide a method for preparing a multi-layer co-extruded biaxially oriented polyamide film with low haze, so as to solve the problem of high haze of the polyamide film produced by the existing preparation method

Method used

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  • Low-haze multi-layer co-extrusion two-way stretching polyamide film and preparation method

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Embodiment Construction

[0023] The main idea of ​​the present invention is to add additives containing silica to polyamide raw materials, because there is good adhesion between silica and polyamide, so the voids on the film will be made after stretching the polyamide film less. Since voids are the main reason for the increase of film haze, the polyamide film added with silica can have good optical properties, such as very low haze, high gloss and transparency. Also, the smaller the silica particles used, the less voids there will be in the film and the lower the haze.

[0024] The low-haze multilayer co-extruded biaxially stretched polyamide film of the present invention comprises a three-layer structure: a surface layer A, a middle layer B and a surface layer C. The surface layer A and the surface layer C are respectively located on both sides of the middle layer B. The thickness of the surface layer A and the surface layer C can be the same or different, generally greater than 0.1 μm, usually in t...

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Abstract

The invention provides a low-haze multi-layer co-extrusion two-way stretching polyamide film and a preparation method. The two-way stretching polyamide film comprises at least three co-extrusion structures, namely a surface layer A, a surface layer C and a middle layer B, wherein the surface layer A and the surface layer C contain antiblocking agents. The invention also discloses a preparation method of the two-way stretching polyamide film, comprising the following steps of: preparing polyamide raw materials, extruding, casting pieces, thermoforming, slacking, drawing, winding, and the like. The two-way stretching polyamide film has the advantages of low haze, high gloss and high transparency and can be widely applied to the field of the packaging industry.

Description

technical field [0001] The invention relates to the field of packaging industry, in particular to a biaxially stretched polyamide film with low haze, high gloss and good processability and a preparation method. Background technique [0002] Polyamide film, also known as nylon film, has excellent mechanical properties, dimensional stability, heat resistance, oil resistance, solvent resistance, puncture resistance and gas barrier properties, so it is widely used in the packaging industry. [0003] However, polyamide is a highly crystalline polymer, and there are strong hydrogen bonds between its molecules, so that the viscosity and plasticity of polyamide films are very sensitive to temperature changes. Therefore, in the process of stretching the polyamide cast sheet into a film, if too many crystallized large particles are produced at the polyamide macromolecular level due to improper temperature control, it will cause the film to be damaged in the subsequent stretching proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/18B29C47/06B29C55/12B29C71/04B29B13/06
Inventor 庄国兴孙明杰
Owner SHANGHAI ZIDONG CHEM MATERIALS
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