Coating solution used before thin film evaporation and preparation process thereof

Abstract

The invention relates to a coating liquid used before evaporation of CPP and PET substrates and its preparation process, which mainly includes bifunctional acrylate, long-chain bisthiol compound, photoinitiator and silane coupling agent pretreated nanometer During the preparation of particles, other additives and solvents, the molar ratio of double bonds and thiol groups in bifunctional acrylates and long-chain dithiol compounds is controlled within the range of 1:1.1-1:1.5. After irradiation with ultraviolet and visible light, A base coating is formed on the surface of the substrate. During the evaporation process of the base coating surface, the flexible long-chain thiol groups chemically bonded in the acrylate coating can bond with the inorganic metal or non-metal of the evaporation layer to form -S (M-S) or metal O-S (M‑O‑S), M represents the chemical bond of inorganic metal or non-metal in the evaporated thin film layer, which improves the bonding strength between the coating and the substrate and improves the adhesion of the inorganic coating, thereby obtaining better barrier properties.

Description

technical field [0001] The invention relates to the field of vapor deposition film manufacturing, in particular to a coating liquid applied before vapor deposition, in particular to a coating liquid pre-evaporated on CPP and PET substrates for improving the coating bonding strength and film barrier properties and its preparation method . Background technique [0002] For a long time, the barrier plastic film, which uses plastic film as the base material and forms an inorganic film on the surface of the plastic film substrate, has been widely used in the packaging of various items that need to block water vapor or oxygen, such as food, industrial supplies and pharmaceutical industries. Perishable packaging material. In recent years, barrier films have also been widely used in industrial fields such as solar cells, organic EL elements, semiconductor elements, electromagnetic wave shields, and color filters. [0003] Aluminum foil may be the material with the best barrier per...

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Problems solved by technology

[0009] Disclosed a kind of composite polyester film among CN201456502U, by coating water-soluble acrylic resin and aluminized layer composite on the surface of polyester film, can cook under the condition of 120 ℃ for 30min without cracking and not falling off, the deficiency of this product is aluminum The bonding fastness between the layer and the acrylic resin is not enough, and part of the acrylic resin and the aluminum layer often fall off during the boiling process.

[0012] Although the coating solution has been widely used in the above-mentioned patented technologies to enhance the adhesion between the polymer substrate and the inorganic coating film, the above-mentioned adhesion or bonding force is mostly physical force, and its bonding strength is weak, resulting in the coating Insufficient adhesion, the barrier properties of the product will also be insufficient

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