Multifunctional polyester thin film and preparation method thereof

Abstract

The invention discloses a preparation method of a multifunctional polyester thin film. The preparation method comprises the steps: with use of a two-way stretching three-layer co-extrusion device, gathering and compositing a base film core layer polyester raw material, a base film upper surface layer polyester raw material and a base film lower surface layer polyester raw material at a film head, then co-extruding and molding, cooling by a 10-40 DEG C quenching roller, then preheating at the temperature of 60-100 DEG C, setting the stretching multiple to 2-5, and longitudinally stretching; preheating at the temperature of 70-130 DEG C, setting the stretching multiple to 2.5-5.5, and transversely stretching; and cooling, carrying out static elimination, rewinding and slitting, to obtain the multifunctional polyester thin film with the thickness 16 [mu]m-100 [mu]m. The polyester thin film prepared by the method can be widely used on the surface of view window glass of automobiles, trains, steamships, buildings and the like, and not only can keep a sterile and healthy environment, but also can achieve the energy saving effect of being cool in summer and warm in winter. The invention also relates to the multifunctional polyester thin film prepared by the method.

Description

technical field [0001] The invention relates to a preparation method of a high-transparency multifunctional polyester film, which involves the original technology of preparing ethylene glycol-based nano-silver solution, the technology of preparing ethylene glycol-based tin-tungsten-vanadium nano-slurry, and the preparation of ethylene glycol-based nano-silver The technology and process of europium slurry also involves the preparation of high-transparency antibacterial polyester raw materials and polyester raw materials with high-transparency infrared selective absorption function by MDT transesterification method and the preparation of high-transparency anti-ultraviolet polyester raw materials. Formula, and then through the three-layer co-extrusion biaxial stretching method to produce a multi-functional polyester film with high transparency, antibacterial, selective infrared absorption, UV protection and other functions. Background technique [0002] Energy is a non-renewabl...

AI Technical Summary

Problems solved by technology

[0002] Energy is a non-renewable substance. Energy conservation and environmental protection are the main themes of life that people are concerned about. Especially with the acceleration of urbanization, the urban construction industry and the automobile industry are developing by leaps and bounds. The task of energy conservation and emission reduction It is becoming more and more heavy, and the window glass in the construction and automobile industries is a part of high energy loss. Therefore, countries are vigorously developing heat insulation and energy-saving films for various window glass parts. Many heat insulation and energy-saving films can be seen on the market. Films and solar films in terms of quality and performance are varied. Chinese patent CN104669756A discloses a kind of anti-infrared nano-heat insulation polyester film and its preparation method, which discloses that the main components of the upper and lower surface layers are crystalline PET homopolymer and The core layer of the nano-oxide modified crystalline PET copolymer, the upper and lower surface layers are co-extruded with the core layer, and the main component of the core layer is the crystalline nano-inorganic modified PET copolymer. A polyester film with a barrier rate of 86% and a visible light transmittance of 70%. This patent only discloses that the main component of the core layer is terephthalic acid, phthalic acid, and ethylene glycol copolymer, but does not disclose nano-inorganic oxidation. The specific ingredients and composition of the compound and its preparation method. Moreover, the patent only refers to a single infrared-absorbing and blocking infrared-resistant polyester film, and does not involve the ability to selectively absorb a certain range of infrared wavelengths in the infrared wavelength region. function, and does not involve multi-functional polyester films such as antibacterial, UV protection, and heat insulation. In Chinese patent CN103640302A, a 3-layer co-extruded biaxially stretched functional polyester film structure is disclosed. In the 3-layer co-extrusion, at least one layer of polyester film is made of uniformly distributed vanadium dioxide VO2 nanopowder, which discloses a polyester film that can automatically adjust the temperature according to the change of ambient temperature. The thickness of the lower surface film is 0

5um to 5um, the thickness of the middle layer film is 5um to 100um, but the composition and chemical formula of vanadium dioxide powder are not disclosed, nor is it involved in the production process and formula of vanadium dioxide powder, let alone antibacterial, infrared How about selective absorption and UV protection, but actually a smart temperature-controlling mylar? The key factors such as heat insulation and energy saving effect, dispersibility, transparency, fog, reaction temperature and reaction time of nano powder in polyester film mainly depend on the preparation method and process of functional nano powder or nano slurry. etc. are closely related. Chinese patent CN103073942B discloses a vanadium dioxide composite powder and its preparation method. This patent only discloses intelligent temperature-control coatings and glass coatings for coatings.

The function is single, the infrared blocking band is very narrow, and the heat insulation performance is also poor. The film realized by coating has many disadvantages and defects, such as cracking, foaming, starting point, poor weather resistance, high production cost, and many other problems after a long time.