Method for preparing ink holdout type metallized paper

Abstract

The invention discloses a method for preparing metallized paper used for label printing and other aspects and having ink holdout function, and in particular relates to innovation of a priming coat and a top coat used for vacuum metallized paper production. (The coating referred below comprises the priming coat and the top coat.) The ink holdout type coating is mainly characterized in that: water borne epoxy resin is taken as a main component and is dissolved in solvents of water and ethanol to form the two-component ink holdout coating, wherein the epoxy resin is high molecular weight bisphenol A water borne epoxy resin meeting the following standards: 1) the epoxy equivalent weight (g / eq) is 1,600 to 2,000; 2) the viscosity (cps, 150DEG C) is 1,300 to 10,000 (5.8); 3) the softening point (DEG C) is 125 to 142; and 4) the color (platinum-cobalt method) is 100 to 250Max. The metallized paper solves the problem that an aluminum layer and an ink layer fall off when a metallized paper label is soaked in aqueous alkali (NaOH); and the metallized paper produced and metallized paper beer labels printed by the invention have strong alkaline hydrolysis resistance and good permeability, and the aluminum layer and the ink layer do not fall off when the metallized paper and the metallized paper beer labels are soaked in the aqueous alkali (NaOH). The metallized paper has important environmental protection application value, and also has significance for reducing the production cost of beer producers and recycling waste.

Description

technical field [0001] The invention belongs to a functional paper, in particular to a method for preparing an aluminized paper with ink-carrying function, which is used for label printing and the like. Background technique [0002] At present, aluminized paper is widely used in many industries such as label printing and food packaging. It is a composite material that is processed by vacuum spraying aluminum on the surface of ordinary raw pulp paper (substrate) to form an aluminum layer with a thickness of 0.025μm±0.005μm. paper material. Its production process mainly includes: (1) Coating (base coating) on ​​the base paper with a layer of polyketone resin solvent coating; (2) Vacuum spraying aluminum on the surface of the primer; (3) Using a layer of polyketone resin solvent coating The ketone resin solvent-based coating is coated on the surface of the aluminum layer (top coating); (4) Finally, post-processing such as rewinding, moisture regain, slitting, and packaging is ...

AI Technical Summary

Problems solved by technology

The aluminum-plated paper used for printing beer labels, because the general primer is easily soluble in alkali and has poor alkali resistance, when cleaning beer bottles with alkaline water, it is easy to cause the ink and aluminum-plated layer on the beer labels to fall off, which is not only serious Contaminate the cleaning solution for cleaning beer bottles, and the peeled ink and aluminum layer will flow into the recycled bottles, causing secondary pollution to the recycled beer bottles

In order to ensure the cleaning effect, the cleaning fluid must be replaced continuously, which puts huge cost pressure on the recycling of beer bottles for beer production enterprises

At the same time, because the peeled ink and aluminum layer dissolve in the cleaning solution, the entire aluminized paper label becomes "fiber fluff" floating in the cleaning solution, which is difficult to filter and recycle.

[0007] The invention solves the problem that the aluminum layer and the ink layer fall off during the immersion of the aluminized paper label in an alkali solution (NaOH), and relates to the coating of the primer and the top coating in the production process of the aluminized paper

Images