Coating liquid used before film evaporation and preparation process thereof

Abstract

The invention relates to a coating liquid used before evaporation of CPP and PET matrixes and a preparation process of the coating liquid; the coating liquid mainly comprises bifunctional acrylate, along-chain dithiol compound, a photoinitiator, silane coupling agent pretreated nanoparticles, other auxiliaries and a solvent. wherein the molar ratio of double bonds to thiol groups in the bifunctional acrylate and the long-chain dithiol compound is controlled in a range of 1: 1.1-1: 1.5, and after ultraviolet and visible light irradiation, a priming coat is formed on the surface of the matrix.In the evaporation process of the surface of the base coating, the flexible long-chain sulfydryl chemically bonded in the acrylate coating can be bonded with inorganic metal or nonmetal of an evaporation layer to form -S (M-S) or metal O-S (M-O-S), wherein M represents the chemical bond of the inorganic metal or nonmetal of an evaporation film layer, and the bonding strength of the coating and thematrix is improved; and the adhesive force of the inorganic coating is improved, so that a more excellent barrier property is obtained.

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...

AI Technical Summary

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

Images