Polyester base film for window film and manufacturing technology of polyester base film

Abstract

The invention belongs to the technical field of macromolecule protective films, and particularly relates to a polyester base film for a window film and a manufacturing technology of the polyester base film. The polyester base film is a thin film of a three-layer structure, the sandwich layer is a tearing resistance layer, and a high-barrier layer and an uvioresistant layer are arranged on the two sides of the sandwich layer. The tearing resistance layer is prepared from, by weight, 10%-15% of polyethylene glycol terephthalate-1,4-cyclohexane 2 methyl alcohol ester (PETG) and 85%-90% of optical grade PET polyester chips. The high-barrier layer is prepared from, by weight, 0.2%-0.35% of SO<2> particles and 99.65%-99.8% of poly naphthalene two formic acid glycol ester (PEN). The uvioresistant layer is prepared from, by weight, 3%-5% of ultraviolet ray absorption master batch and 95%-97% of optical grade PET polyester chips. The polyester base film can isolate ultraviolet rays, oxygen and vapor and prolong the service life of the window film, and has the advantages of being good in tearing resistance performance and optical performance. The invention provides a window film manufacturing technology which is easy to operate and low in cost.

Description

technical field [0001] The invention belongs to the technical field of polymer protective films, and is used in occasions where it is necessary to isolate ultraviolet rays, oxygen or water vapor, improve the impact strength of glass, etc., and specifically relates to a polyester base film for window films and a manufacturing process thereof. Background technique [0002] With the country's increasingly positive attitude towards "energy saving and emission reduction" environmental protection, window film has become one of the beneficiary industries under the policy of energy saving and environmental protection, and its future development prospects in my country are also very broad. Window film is mainly used for automobile glass and building door and window glass. It is pasted on the glass surface to improve the performance and strength of the glass, and to make it have thermal insulation, heat insulation, energy saving, explosion-proof, beautify the appearance, hide privacy...

AI Technical Summary

Problems solved by technology

[0004] (1) Most of the window films use ordinary optical-grade PET as the substrate. After 5 to 8 years of use, aging, discoloration and even cracking will occur. The main reason is that the substrate has been exposed to sunlight for a long time and moisture in the air, Oxygen erosion changes its structure, thereby reducing the life of the window film;

[0005] (2) The window film using PET as the base material has poor tear resistance, cannot play a good cushioning effect when impacted, and does not have the function of safety protection;

[0006] (3) In the prior art, the anti-ultraviolet window film realizes the anti-ultraviolet function by coating the anti-ultraviolet coating on the surface of the film, and the barrier type window film generally realizes the barrier function by compounding a layer of barrier film on the surface of the substrate. The above-mentioned processes are compared Complicated and expensive to produce;

[0007] (4) The tear resistance of window films is generally achieved by laminating multiple layers of PET substrates. This process not only has the disadvantages of complexity and high cost, but also affects the transparency of the window film and reduces the transmission of visible light. At the same time, the window film prepared by this process has poor aging resistance and is easy to be degummed and edged;

[0008] (5) The window film substrate in the prior art is mainly prepared by a step-by-step biaxial stretching process. During the biaxial stretching process, the film is in contact with the stretching roller, which will reduce the optical and surface properties of the film

Images