Polyester film with high barrier property and preparation and application thereof
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A polyester film, high-barrier technology, applied in the field of film materials, can solve the problems of coating adhesion, increased production cost, unevenness, etc., to improve heat aging resistance and weather resistance, enhance impact resistance, and improve heat resistance. shrinkage effect
Inactive Publication Date: 2022-02-22
河南源宏高分子新材料有限公司
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However, among the above methods, for the method of depositing inorganic coatings, usually when depositing inorganic coatings, the surface of the deposited inorganic coatings is likely to be rough, uneven, not compact, and prone to vacuum, cracks and other disadvantages, resulting in production failures. The barrier property of the inorganic coating decreases, which eventually leads to a decrease in the quality of the high-barrier polyester film; for PVDC emulsion coating methods, coating adhesion and peeling are prone to occur in harsh environments, which directly affects the service life of the polyester film; for PVDC, EVOH and more The method of layer compounding not only complicates the production process, but also increases the production time and raw material consumption, thereby increasing its production cost
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[0042] The polyester films of Examples 1-5 are all composed of an outer skin, an inner skin and a central core layer arranged between the outer skin and the inner skin, wherein the raw material components of the outer skin and the inner skin and their parts by weight are as shown in Table 1-1 shown.
[0043] project PET PEN PET-g-MAH Anti-shrinkage agent chain extender Anti-ultraviolet agent Heat stabilizers Example 1 70 30 10 2 1 0.1 0.2 Example 2 75 25 8 3 1 0.3 0.4 Example 3 78 22 5 4 2 0.5 0.5 Example 4 82 18 3 4 2 0.5 0.6 Example 5 85 15 1 5 3 0.6 0.8
[0044] The intrinsic viscosities of PET and PEN used in the raw material components of the outer and inner layers of Examples 1-5 are shown in Table 1-2 below.
[0045] project Example 1 Example 2 Example 3 Example 4 Example 5 PET intrinsic viscosity 0.6 dL / g 0.62 dL / g 0.65 dL / g 0.68 dL / g 0.7 dL / g P...
Embodiment 5
[0060] In embodiment 5, PET and dibenzoyl peroxide, maleic anhydride, two [ethyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)] 2,2-oxalamide by mass ratio The ratio is 100:0.1:5:0.3, and the temperature of the twin-screw extruder is controlled at 290°C.
[0061] The starch-modified superfine montmorillonite used in the raw material components of the core layer of embodiment 1-5 is prepared by the following method:
[0062] Grind montmorillonite, pass through a 1000-mesh sieve, add the sieved montmorillonite and starch into the aqueous solution containing sodium dodecylsulfonate, stir and mix evenly at 60°C, and then ultrasonically disperse at 40°C , to obtain a stable suspension; then use a high-pressure spray dryer to dry the suspension to solidify the starch, that is, to obtain a starch-modified ultrafine montmorillonite.
[0063] In the above-mentioned process of preparing starch-modified ultrafine montmorillonite:
Embodiment 1
[0064] In embodiment 1, add the sodium lauryl sulfate of 1 weight part, the montmorillonite of 10 weight parts and the starch of 18 weight parts in the water of every 100 weight parts;
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Abstract
The invention relates to a polyester film with high barrier property, wherein the polyester film comprises an outer surface layer, an inner surface layer and a middle core layer arranged between the outer surface layer and the inner surface layer, wherein the outer surface layer and the inner surface layer are prepared from the following raw materials in parts by weight: 70 to 85 parts of PET, 15 to 30 parts of PEN, 1 to 10 parts of PET-g-MAH, 2 to 5 parts aofn anti-shrinking agent, 1 to 3 parts of a chain extender, 0.1 to 0.6 part of an anti-ultraviolet agent and 0.2 to 0.8 part of a heat stabilizer; and the middle core layer is prepared from the following raw materials in parts by weight: 60 to 80 parts of PET, 20 to 40 parts of PMMA, 1 to 10 parts of PET-g-MAH, 5 to 20 parts of starch modified superfine montmorillonite, 2 to 8 parts of a chain extender, 0.1 to 1 part of an antioxidant and 0.2 to 0.5 part of a hydrolysis-resistant stabilizer. Compared with the prior art, the polyester film provided by the invention has excellent water vapor barrier property and thermal shrinkage resistance, good flexibility and weather resistance, simple and efficient preparation process, and good application prospect.
Description
technical field [0001] The invention belongs to the technical field of film materials, and relates to a polyester film with high barrier performance and its preparation and application. Background technique [0002] At present, polyester film has been widely used in packaging, encapsulation and other fields, but in the actual use process of polyester film, with the prolongation of use time, its water vapor barrier performance will be significantly reduced, and in order to improve and maintain the polyester film Water vapor barrier properties, usually the following methods can be used: 1) Use plasma enhanced chemical vapor deposition, vacuum sputtering or evaporation to deposit some kind of inorganic coating on plastic substrates; 2) Use PVDC to make emulsion, on polyester film Coating on the substrate; 3) Using PVDC, EVOH to carry out multi-layer composite with polyester film. However, among the above methods, for the method of depositing inorganic coatings, usually when de...
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