A kind of polyester film for optical high permeability glue protection and preparation method thereof

Abstract

The invention relates to the field of polyester films, and discloses a polyester film used for protecting optical high-transmittance adhesive and a preparation method of the polyester film. The polyester film used for protecting the optical high-transmittance adhesive comprises a first base material layer (1), a second base material layer (2) and a middle core layer (3). The preparation method of the polyester film used for protecting the optical high-transmittance adhesive comprises mixing silicon dioxide, a silane coupling agent and bottle grade polyester chips to prepare MB10 master batches, mixing a nanometer ITO antistatic agent and bottle grade polyester chips to prepare ATS 10 antistatic master batches, and performing material feeding, crystallization, drying, melting by an extruder, sheet casting, longitudinal stretch, transverse stretch, moulding, pulling, corona processing and winding of a three-layer co-extrusion BOPET production line to obtain the polyester film used for protecting the optical high-transmittance adhesive provided by the invention. The film is in a clean shop during the whole production process. The technical scheme disclosed by the invention can effectively reduce inner and outer defects of the polyester film used for protecting the optical high-transmittance adhesive, and increase the smooth, clean and flat degrees of the film surfaces.

Description

technical field [0001] The invention relates to the field of polyester films, in particular to a polyester film for optical high-permeability adhesive protection and a preparation method thereof. Background technique [0002] The polyester film for optical adhesive protection belongs to the high-end release film and protective film in the fields of electronics and optics; when the optical high-transparency adhesive is formed, the film is used as the base material, and after the optical high-transparency adhesive is formed, the film is used as Protective film, this film is used as a release film when optically transparent adhesive is used. [0003] The polyester film for optical high-transparency protection requires few internal and external defects, high surface smoothness, high haze, and high light transmittance; the current existing biaxially stretched polyester film production line and raw material formula are difficult to achieve the above-mentioned Technical requiremen...

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Problems solved by technology

[0003] The polyester film for optical high-transparency protection requires few internal and external defects, high surface smoothness, high haze, and high light transmittance; the current existing biaxially stretched polyester film production line and raw material formula are difficult to achieve the above-mentioned Technical requirements; one is that during the production process of the film, static electricity will absorb the particle powder layer in the air and form impurities inside the film, which need to be removed by high-precision filters, which is very costly, and it is difficult to remove the defects inside and outside the film Clean, the remaining impurities have the function of removing gel, so that the defects inside and outside the film cannot be removed, and the anti-blocking agent used in the prior art will make the surface roughness of the film relatively high, which will eventually cause defects on the surface of the optical high-transparency adhesive film , if it is used in optical components, it will affect the performance of optical components; and the polyester protective film used for the protection of ordinary release optical glue used in industrial products in the market currently relies on foreign imports, and foreign production processes are protected as trade secrets and have not been disclosed. , and the defects inside and outside the film of the produced product are relatively large, the defects above 200 microns are more than 50 per square meter, and the surface roughness of the film is generally Ra>0.06

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