Flame-retardant polyester film and preparation method thereof

Abstract

The invention provides a flame-retardant polyester film and a preparation method thereof, and relates to the technical field of polyester films, the flame-retardant polyester film comprises a first-layer film, a second-layer film and a third-layer film, the first-layer film comprises the following components by weight: 70-90 parts of polyethylene glycol terephthalate, 10-18 parts of glass fiber, and 1-3 parts of a flexibilizer, and the third-layer film comprises the following components by weight: 1-3 parts of a flame retardant; 5-7 parts of an antioxidant; the second-layer film comprises the following components in parts by weight: 50-60 parts of polyethylene glycol terephthalate, 20-25 parts of a flame retardant, 5-8 parts of a stabilizer and 3-6 parts of an anti-blocking agent; and the third-layer film comprises the following components in percentage by weight: 80-85 parts of polyethylene glycol terephthalate. The flame-retardant polyester film is prepared by compounding the first-layer film, the second-layer film and the third-layer film, the glass fibers are added into the first-layer film to improve the strength, the second-layer film has the characteristic of high fire resistance, and the third-layer film can effectively inhibit static electricity, so that the flame-retardant polyester film is remarkable in advancement.

Description

technical field [0001] The invention relates to the technical field of polyester films, in particular to a flame-retardant polyester film and a preparation method thereof. Background technique [0002] Polyethylene terephthalate film has a wide range of applications in the field of electronic products, but because polyethylene terephthalate film is easy to burn, so the flame retardant properties of polyethylene terephthalate film Put forward certain requirements, flame retardant polyester film is born. [0003] Chinese Patent No. CN110041672A discloses a flame retardant polyester film and a preparation method thereof. The flame retardant polyester film is mainly prepared from the following weight components: 55-65% PET, 30-35% phosphorus-containing flame retardant, 3~5% stabilizer, 0.5~1.0% nano inorganic matter and 0~4% colorant, although this kind of flame retardant polyester film has flame retardant performance up to UL94VTM-0 level, the minimum film thickness can reach ...

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Problems solved by technology

[0003] Chinese Patent No. CN110041672A discloses a flame-retardant polyester film and its preparation method. The flame-retardant polyester film is mainly prepared from the following weight components: 55-65% PET, 30-35% phosphorus-containing flame retardant, 3-5% stabilizer, 0.5-1.0% nano-inorganic substances and 0-4% colorant, although this kind of flame-retardant polyester film has flame-retardant performance up to UL94VTM-0 grade, the minimum film thickness can reach 25μm , has the advantages of high cost performance, but there is a problem of low strength, which is prone to damage and affects the service life of the film

[0004] Chinese Patent No. CN109795197A discloses a halogen-free flame-retardant polyester film and its preparation method, which is an ABA three-layer film structure; wherein, the A-layer film is made by mixing the following components by mass: 67-75 parts poly Ethylene terephthalate and 25-33 parts of mixture; B-layer film is made by mixing the following parts by mass: 55-60 parts of polyethylene terephthalate, 20 parts of opening agent Chips and 20-25 parts of flame retardant masterbatch; wherein, the mixture is a mixture of flame retardant masterbatch or flame retardant masterbatch and titanium dioxide white masterbatch or a mixture of flame retardant masterbatch and blue polyester masterbatch; wherein, the The flame retardant masterbatch is prepared by the following method: add 10-40% of phenoxycyclophosphazene, 1-2% of antioxidant and 2-3% of dispersant to polyester by weight, and blend The flame retardant masterbatch is obtained by extruding and granulating after uniformity. Although the phenoxycyclophosphazene flame retardant is added to the polyester film through a special process, this kind of polyester film not only does not affect the mechanical properties and thermal properties of the polyester film. Stable performance and light transmittance, and also obtained a polyester film with high flame retardancy, but there is a problem of poor antistatic performance, so when the polyester film is applied to electronic products, it is easy to affect the normal use of electronic products

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