A kind of co-extruded biaxially stretched pet/pps composite film and preparation method thereof

Abstract

The invention discloses a co-extruded two-way stretching PET / PPS composite film. The film is characterized in that: the film is an ABA three-layer structure composite film with a total thickness of 60-135microm, wherein the layer A is modified PPS, the layer B is modified PET, the thickness of the layer A is 15-30microm, and the thickness of the layer B is 30-75microm. The preparation method includes: preparation of modified PET resin, preparation of modified PPS resin and preparation of the co-extruded two-way stretching PET / PPS composite film. The co-extruded two-way stretching PET / PPS composite film has a low-molecular weight xylene extraction value of 0.2%-0.42%, a long-term heat resistance temperature of 155DEG C, and a water vapor permeability of 2.3-3.8g / m<2>.24h. The composite filmprovided by the invention has the characteristics of high strength and dimensional stability, high temperature resistance, low water vapor permeability, high transparency and the like, and can be used for preparation of high temperature resistant film adhesive tapes, compressor insulation films, food packaging films, etc.

Description

technical field [0001] The invention belongs to different types of polymer materials to prepare composite films, and relates to a co-extruded biaxially stretched PET / PPS composite film and a preparation method thereof. The invention adopts polyethylene terephthalate (abbreviated as PET) and polyphenylene sulfide (abbreviated as PPS) to prepare a composite film through co-extrusion biaxial stretching, and the prepared composite film has high strength, stable size and high temperature resistance. , low water vapor transmission rate, and high transparency, etc., can be used to prepare high temperature resistant film tape, compressor insulation film and food packaging film, etc. Background technique [0002] At present, PET film has been widely used in liquid crystal display, adhesive tape, insulating motor, food packaging and other fields. The product has the advantages of high mechanical strength, good transparency, low price, good dimensional stability, and good insulation pe...

AI Technical Summary

Problems solved by technology

CN101797800A discloses a method for preparing an inorganic filler-modified PPS biaxially stretched film, the thermal deformation temperature of the obtained film is not lower than 163°C, the thickness change is not more than 4%, and the thermal shrinkage at 250°C is ≤1%; CN108003617A discloses a The preparation method of polyphenylene sulfide film for capacitors is reinforced with additives such as carbon fiber, and formed into film by extrusion blow molding, which makes up for the shortcomings of low orientation degree and low crystallinity of existing films; CN103937242A discloses a polyphenylene sulfide film Based on sulfide, with organic elastomer and inorganic filler as modified materials, blended film obtained by biaxial stretching

[0006] With the in-depth research on PET film and PPS film, a single film can no longer meet the increasing performance requirements. Therefore, how to combine the advantages of PET and PPS, learn from each other, solve the process problems in production, and ensure the mechanical strength of the material and Toughness is a new direction in the field of membrane materials

Under the existing technology, when PET and PPS are co-extruded and then biaxially stretched to prepare a composite film, there are two main problems: one is that the glass transition temperature of PET and PPS is different, so that the two materials cannot be produced at the same time. Stretching at high temperature, if the stretching temperature does not match, one layer cannot be stretched; second, because PET and PPS are two incompatible systems, the preparation of a three-layer composite film will be at two different heights. Significant delamination occurs between molecular material films or sheets

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