Hydrolysis-resistant fluorine-containing copolyester resin, hydrolysis-resistant fluorine-containing copolyester composite base film and preparation method thereof

Abstract

The invention discloses hydrolysis-resistant fluorine-containing copolyester resin, a hydrolysis-resistant fluorine-containing copolyester composite basal membrane and a preparation method thereof. The molecular weight of the hydrolysis-resistant fluorine-containing copolyester resin ranges from 14,000 to 25,000; the hydrolysis-resistant fluorine-containing copolyester resin is prepared through binary formic acid and ethanediol, the hydrolysis-resistant fluorine-containing copolyester resin and PET resin are fused through an extruder according to the mass ratio of (10-200) to 100, layered coextrusion through a resin fusion distributor, casting strip compound, longitudinal stretching, transverse stretching, heat setting, cooling and rolling are conducted, and the hydrolysis-resistant fluorine-containing copolyester composite basal membrane is prepared. According to the hydrolysis-resistant fluorine-containing copolyester resin, the hydrolysis-resistant fluorine-containing copolyester composite basal membrane and the preparation method thereof, the thickness of the hydrolysis-resistant fluorine-containing copolyester composite basal membrane ranges from 100 micrometers to 300 micrometers, and the hydrolysis-resistant fluorine-containing copolyester composite basal membrane is specially suitable for manufacturing of a release membrane and solar energy photovoltaic cell backplane materials, good in performance and strongin practicability.

Description

technical field [0001] The invention belongs to the preparation of polyester-based copolymer resin and its layered products, and relates to a hydrolysis-resistant fluorine-containing copolyester resin, a hydrolysis-resistant fluorine-containing copolyester composite base film and a preparation method thereof. The hydrolysis-resistant fluorine-containing copolyester resin and the hydrolysis-resistant fluorine-containing copolyester composite base film of the present invention are particularly suitable for the manufacture of release films and solar photovoltaic cell backboard materials. Background technique [0002] As we all know, PET (abbreviation for polyethylene terephthalate) biaxially stretched polyester film has excellent mechanical properties, chemical properties and optical properties, but there are a large number of ester bonds in the molecular chain that are prone to hydrolysis, making the film The decrease in intrinsic viscosity leads to a sharp drop in the mechani...

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Problems solved by technology

[0003] In the prior art, the research on the improvement of the hydrolysis resistance of the solar battery backplane base film with PET polyester (i.e.: polyethylene terephthalate) resin as the main material mainly focuses on four aspects: one is , Chinese Patent Publication CN101983432A, is to improve the hydrolysis resistance of PET film by mixing carbodiimide compound with polyester, but in the manufacture and application of film in this way, isocyanate and other mucous membrane irritating or harmful substances will be released. By-product and degradation product; The 2nd, Chinese patent disclosure CN101899198A adds the hydrolysis stabilizer based on epoxidized fatty acid ester and a certain amount of epoxidized fatty acid glyceride to improve the hydrolysis resistance of PET film in film, because The hydrolysis stabilizer of the epoxidized fatty acid ester will produce a small amount of gel in the production of the film, which will affect the appearance of the film on the one hand; Patent JP2002-026354 uses high molecular weight PET resin to improve the hydrolysis resistance of PET film. This method can improve the hydrolysis resistance of PET film to a certain extent, but in the film manufacturing process, due to the high molecular weight of PET, it is difficult to stretch the film. Transverse stretching is easy to disengage, and the film rupture rate is high; Fourth, Japanese patent JP2009-045888: using PEN and PET blends to improve the hydrolysis resistance of PET films, the PEN content of the PET / PEN blend system is 20% to 80% %, the system does not crystallize, which affects the physical and mechanical properties of the film, and the shrinkage rate of the film is large. If the PEN content is lower than 20%, the hydrolysis resistance of PET will not be improved; if the PEN content is higher than 80%, it will be difficult to make a film. It is difficult to achieve film pulling with the current PET film pulling device

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