Preparation method of PET-based heat reflecting film

Abstract

The invention discloses a preparation method of a PET-based heat reflecting film. The preparation method comprises the following steps: (1) modifying PET through nano SiO2 particles to obtain modifiedPET, (2) carrying out pre-crystallization and drying treatment on the modified PET raw material, feeding into an extruder for melting and plasticizing, then carrying out die head treatment through apre-filter, a metering pump and a main filter, pressing on a quenching wheel by an electrostatic adsorption device, rapidly cooling to form a cast sheet, then sequentially stretching longitudinally and transversely and carrying out shaping, cooling, thickness measurement, edge cutting, electrostatic elimination treatment and online rolling on the base film, so that the PET thermal composite film is obtained, and (3) covering an aluminum plate with the PET thermal composite film, feeding the aluminum plate into a hot press and carrying out hot press molding. As a metal plate surface coating with excellent performance, the PET film has excellent wear resistance, heat resistance and better mechanical properties, according to the invention, the PET film is subjected to surface modification through the nano SiO2 particles, the PET film does not need to be coated with an adhesive of a middle layer while being laminated with a metal plate, and the PET film not only can play a role in laminating, but also can play a role in gluing.

Description

technical field [0001] The invention relates to the technical field of protective films compounded on metal materials, and more particularly to a preparation method of a PET-based heat reflective film. Background technique [0002] For a long time, the main method for anti-corrosion treatment of metal materials is to coat the metal surface. The polymer films used for the coating of metal materials include PP, PA, PE, PET, etc. Among them, PET film has the best comprehensive performance, and has the characteristics of easy molding, antibacterial, high hardness, high temperature resistance, wear resistance, and can be printed after special treatment. At present, it is a relatively common method to effectively bond PET to a substrate by coating an adhesive. [0003] For example, the Chinese patent document with publication number CN101143502A discloses a method for making a coated metal plate, which includes: 1) surface-treating the substrate to achieve the substrate state req...

AI Technical Summary

Problems solved by technology

However, during the preparation, use and processing of common adhesives, toxic or harmful and irritating substances will be produced, which will bring environmental problems; its thermal curing usually takes 5 days; and the adhesive has low yield, low production efficiency, and production High cost, poor anti-shedding performance, low peeling strength, no UV protection, etc.; especially in the case of changing climate and environmental conditions, the coating on the surface of the metal plate is easy to fall off, resulting in the exposure of the base layer of the metal plate, which is vulnerable to Corrosion; in high temperature environment, the coating on the surface of the metal plate will appear yellowing and fall off as a whole, which will seriously affect the appearance of the product; in addition, the global heat island effect is serious. After a long period of solar radiation, the metal plate will cause residential and commercial The temperature of roofs, exterior walls and indoors of buildings, offices, etc. rises sharply, which in turn increases the energy consumption of refrigeration equipment such as air conditioners, and further aggravates the global greenhouse effect.

Images