Multipolymer resin, multipolymer compound base film and preparation method of multipolymer compound base film

Abstract

The invention discloses multipolymer resin, a multipolymer compound base film and a preparation method of the multipolymer compound base film. The molecular weight of the multipolymer resin is 6000-28000. The preparation method includes the steps that binary formic acid and a dyhydroxyl-containing compound are reacted to prepare the multipolymer resin, then the multipolymer resin and PET resin are fused through extruders respectively at the mass ratio of (10-200):100, layered co-extrusion is carried out through a resin fusion distributor, casting sheet compounding, longitudinal drawing, transverse drawing, heat shaping, cooling and winding are carried out, and the multipolymer compound base film is obtained. The thickness of the multipolymer compound base film ranges from 100 micrometers to 300 micrometers, and the multipolymer compound base film is especially suitable for preparing film materials in various hot and humid environments, wherein the film materials include materials for weather-proof films (agricultural films or films used in special environments), release films, photovoltaic cell backboard films and the like.

Description

technical field [0001] The invention belongs to the preparation of polyester-based copolymer resin and layered products thereof, and relates to a multi-component copolymer resin, a multi-component copolymer composite base film and a preparation method thereof. The multi-component copolymer resin and multi-component copolymer composite base film of the present invention are especially suitable for the manufacture of film materials under various hot and humid environmental conditions, such as weather-resistant films (agricultural or special environments), release films, materials for photovoltaic battery backplane films Wait. 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 redu...

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Problems solved by technology

[0003] In the prior art, the researches on improving the weather-resistant high barrier and the hydrolysis resistance of the solar battery backplane base film with PET polyester (ie: polyethylene terephthalate) resin as the main material mainly focus on five Aspects: First, use the high reactivity of fluorine gas as a fluorinating agent to modify the surface of polymers in polyester films (research progress in direct fluorinated surface modification technology, Polymer Bulletin, Issue 4, 2010 and Carbon Research on the reaction mechanism of fluorine plasma modified PET surface, Chemical Journal of Chinese Universities, Volume 11 in 1998), can significantly improve the barrier performance of the film, thereby improving the hydrolysis resistance of the film, but the fluorine gas in this way is easily It is flammable and explosive, and the HF gas produced by the fluorination process pollutes the environment; the second is that Chinese patent publication CN101899198A adds a hydrolysis stabilizer based on epoxidized fatty acid esters and a certain amount of epoxidized fatty acid glycerides to the film. Improve the hydrolysis resistance of PET film, because the hydrolysis stabilizer of epoxidized fatty acid ester will produce a small amount of gel in film production, which will affect the appearance of the film on the one hand; The process is easy to break the film; the third is that the Japanese patent JP2002-026354 improves the hydrolysis resistance of PET film by using high molecular weight PET resin. This method can improve the hydrolysis resistance of PET film to a certain extent, but in the film manufacturing process, due to PET has a high molecular weight, it is difficult to stretch the film, and it is easy to unclip in the transverse stretching, and the film rupture rate is high. The PEN content of the mixed system is 20% to 80%, the system is not crystallized, 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 high If it is less than 80%, it is difficult to make a film. It is difficult to realize the film drawing with the current PET film drawing device.

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