A kind of siloxane-polyester copolymer resin, siloxane-polyester copolymer composite base film and preparation method thereof

Abstract

The invention discloses siloxane-polyester copolymer resin, a siloxane-polyester copolymer compound substrate membrane, and methods for preparing the siloxane-polyester copolymer resin and the siloxane-polyester copolymer compound substrate membrane. The molecular weight of the siloxane-polyester copolymer resin is 10000-25000. The siloxane-polyester copolymer resin is prepared through reaction between terephthalic acid and a compound containing dyhydroxy. The siloxane-polyester copolymer resin and PET resin are molten through an extruder based on the mass ratio of (10-200) : 100, and then delamination coextrusion with a resin melting distributor, casting strip combination, longitudinal drawing, horizontal drawing, heat setting, cooling and coiling are conducted to obtain the siloxane-polyester copolymer compound substrate membrane. The thickness of the compound substrate membrane prepared from the siloxane-polyester copolymer is 100-300 microns, and the compound substrate membrane is especially suitable for manufacturing of release films and hydrolysis resistance materials for solar photovoltaic cell backboards and is high in performance and practicality.

Description

technical field [0001] The invention belongs to the preparation of polyester-based copolymer resin and layered products thereof, and relates to a siloxane-polyester copolymer resin, a siloxane-polyester copolymer composite base film and a preparation method thereof. The siloxane-polyester copolymer resin and the siloxane-polyester copolymer composite base film of the present invention are particularly suitable for the manufacture of materials such as release films and solar photovoltaic battery backplanes for hydrolysis resistance. 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 intrinsic viscosity is reduced, resulting in a significant decrease in the mechanical properties of the film and a signifi...

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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 five aspects: one is , use silicone oil or fluorine-containing silicone oil to coat PET film off-line to reduce the surface tension of the film and achieve the purpose of hydrophobicity, thereby improving the hydrolysis resistance of the film. However, this method generally uses the solvent method, and the static electricity in the production process is likely to cause the solvent to be flammable and explosive; the second is , Chinese Patent Publication CN101899198A adds a hydrolysis stabilizer based on epoxidized fatty acid ester and a certain amount of epoxidized fatty acid glyceride to the film to improve the hydrolysis resistance of PET film, due to the epoxidized fatty acid ester The hydrolysis stabilizer 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; on the other hand, the gel will cause stress concentration, and the film is easy to break during the film making process; the third is that the Japanese patent JP2002-026354 uses high molecular weight PET resin is used to improve the hydrolysis resistance of PET film. This method can improve the hydrolysis resistance of PET film to a certain extent. However, in the film manufacturing process, due to the high molecular weight of PET, it is difficult to stretch the film, and it is easy to detach when stretching in the transverse direction. High rate of membrane rupture; Fourth, Japanese Patent JP2009-045888: Blending of PEN and PET is used to improve the hydrolysis resistance of the PET film. The PEN content of the PET / PEN blend system is 20% to 80%, and the system does not crystallize, which affects the film. Physical and mechanical properties, the shrinkage rate of the film is large, if the PEN content is lower than 20%, the hydrolysis resistance of PET is basically not improved; if the PEN content is higher than 80%, it is difficult to make a film, and it is very difficult to use the current PET film drawing device. Difficult to pull film

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