Thermal sublimation photographic paper electrostatic resistance coatings

Abstract

The invention discloses an antistatic coating of thermal dye sublimation photo paper. The antistatic coating comprises an antistatic agent, an acrylic resin and a solvent, the antistatic agent comprises a permanent antistatic agent which takes polyamide and polyether hindered anime as the basis for synthesis and a nano TiO2 conductive powder auxiliary antistatic agent which is coated by SnO2 and is carried out the Sb2O5 doping processing. As the technical proposal of the invention has excellent antistatic property, the antistatic coating can ensure the effectivity and the permanent property of the usage under the wide conditions of a relative humidity; in addition, as the polyethylene terephthalate and other plastic films have good adhesive property, the antistatic coating is applicable to the formation of the uniform and firm antistatic coating by the coating method, and the fastness of the coating is good.

Description

technical field [0001] The invention relates to the technical field of photographic paper, in particular to an antistatic coating for sublimation photographic paper. Background technique [0002] In dye-sublimation digital photo paper, antistatic is a very important indicator. It is required that the back coating has a low and stable surface resistance, which should reach 10 9 -10 10 Ω, in order to effectively eliminate static electricity. The commonly known method of eliminating static electricity is to add antistatic agents to the coating resin, such as hydroxyethylated fatty amines, sulfonates, quaternary ammonium salt compounds, fatty acid esters, etc., but such antistatic agents rely on bare The hydrophilic group on the surface of the coating absorbs moisture in the ambient air to form a molecular water film, reduces the surface resistance, and derives static charges to eliminate static electricity. This type of antistatic agent is greatly affected by the relative hum...

AI Technical Summary

Problems solved by technology

The commonly known method of eliminating static electricity is to add antistatic agents to the coating resin, such as hydroxyethylated fatty amines, sulfonates, quaternary ammonium salt compounds, fatty acid esters, etc., but such antistatic agents rely on bare The hydrophilic group on the surface of the coating absorbs moisture in the ambient air to form a molecular water film, reduces the surface resistance, and derives static charges to eliminate static electricity. This type of antistatic agent is greatly affected by the relative humidity of the environment, and the surface resistance varies in a wide range , when the relative humidity of the environment is high, the surface will become damp, and the hand will feel sticky, causing paper feeding obstacles during printing. When the relative humidity is low, the surface cannot form a continuous molecular water film, and the surface resistance increases to 10 12 Ω or more, the antistatic effect is lost; because the hydrophilic group of the antistatic agent is either alkaline such as quaternary ammonium salts, or acidic such as sulfonates, it will contaminate the image receiving layer, and the change in pH value will eventually affect The dye cannot develop color normally, reducing the dyeing intensity and causing color distortion. The use of quaternary ammonium salt antistatic agents has the greatest impact; another disadvantage of this type of antistatic agent is migration, which migrates to the surface of the coating over time. Dye-sublimation digital photo paper is stacked facing the back during storage. The antistatic agent on the back is contaminated with the image receiving layer, which will destroy its anti-fingerprint property. After printing, there will be obvious brown-red fingerprints on the image. At the same time reduce the adhesion and fastness of the protective film and image receiving layer, and reduce the storage time of photos

Simultaneously, have added quaternary ammonium salts, the antistatic coating composition of sulfonate antistatic agent can make this composition deteriorate to the adhesive fastness of plastic films such as polyethylene terephthalate

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