Thermoplastic composite film special for EPS (Expandable Polystyrene) and production process thereof

Abstract

The invention discloses a thermoplastic composite film special for EPS (Expandable Polystyrene) and a production process thereof. The composite film comprises an anti-wear layer, a toughening layer, ahardening layer and an adhesive layer which are arranged from the outside to the inside in sequence; a raw material of the anti-wear layer is a polypropylene high-density polyethylene blended modified material; a raw material of the toughening layer is a polypropylene modified material; a raw material of the hardening layer is a polypropylene high-density polyethylene blended modified material; araw material of the adhesive layer is an EEA (ethylene-propylene acetate) imported resin. During preparation of the composite film, four layers of screw rods and a mold are respectively heated to temperatures required for processing, and the raw materials of the anti-wear layer, the toughening layer, the hardening layer and the adhesive layer are vacuum-fed; the raw materials are uniformly converged, superimposed and fused under a condition of completely uniform distribution and then are subjected to swelling, crystallization for shaping and winding through a circular mold port. The compositefilm disclosed by the invention not only satisfies good adhesion with EPS, but also has good resistance to cracking, strength, hardness and high and low temperature weather resistance, has relativelylow cost compared with the cost of similar products, and meets the production requirements of automated online integrated molding.

Description

Technical field [0001] The invention relates to the technical field of composite membranes, in particular to a thermoplastic composite membrane dedicated to EPS and its production process. Background technique [0002] Polystyrene foam (EPS) is a kind of foam with a rigid closed-cell structure formed by adding a foaming agent to polystyrene resin and softened by heating. It has high rigidity, high glass transition temperature, brittleness, and thermal insulation. Heat and other characteristics, widely used in building walls, roof insulation, floor heating, decoration and carving and other fields. In the process of packaging and protecting the material by polystyrene foam, due to the defects of poor drop resistance and wear resistance, it is prone to breakage and damage, resulting in the separation of the packaged items, and there are hidden safety hazards. In view of the above problems, the conventional method currently used is to laminate a layer of EPS special thermoplastic co...

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Problems solved by technology

[0004] At present, the commonly used thermoplastic composite film for EPS uses thermoplastic resin materials such as polyethylene or polypropylene as the matrix. After adding some functional additives, it can be heated, melted, extruded, and stretched. There are the following problems: 1. The function is relatively single. , poor weather resistance and mechanical properties. When EPS is transported under long-term sunshine, rain, and high-pressure environments, it is prone to wrinkle and cracking of the composite film, and the protective performance of EPS will deteriorate; 2. Lack of reasonable production The process design cannot make the components fully compatible and extrude, and the processing temperature and size cannot be accurately controlled, so that the composite film cannot be integrally formed, the product quality is uneven, and the production process needs to be further improved.

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