A kind of easy-to-pulpable die-cutting high-barrier food-coated cardboard and preparation method thereof

Abstract

The invention relates to an easy-to-pulp, die-cut high-barrier food coated cardboard and a preparation method thereof. The coating is composed of a coating layer composed of a polyvinyl alcohol aqueous solution and a polyacrylate emulsion with a low glass transition temperature and a coating layer of a high-barrier emulsion that are sequentially coated on a paper substrate; One side of the cardboard substrate is coated once with a polyvinyl alcohol aqueous solution and a polyacrylate emulsion compound with a low glass transition temperature, then dried, and then coated with a high-barrier emulsion for a second time, dried, and cooled. Can. Compared with the prior art, the coating of the present invention has small molecular elongation, brittle texture, low strength, is prone to natural disintegration, and is convenient for waste paper recycling, pulping and reuse, and is beneficial to ecological balance and environmental protection.

Description

A kind of easy-to-pulpable die-cutting high-barrier food-coated cardboard and preparation method thereof technical field The present invention relates to a kind of coated paper, especially relate to a kind of easy-to-pulp die-cutting high-barrier food coated paperboard and its preparation method. Background technique [0002] Laminated paper, also known as white plastic paper, anti-seepage paper, is mainly used to make paper boxes, paper cups, paper bags and packaging for food. shower Film paper is to melt and coat plastic particles (usually PE or PP) on the surface of the paper through a casting machine at high temperature, and then press and cool. The composite material prepared by the procedures such as cooling, winding and so on. Such products have low biodegradability, paper recycling is difficult, and recycling The cost of recycling is higher than the value of its own recycled pulp. Many paper mills give up the recycling and reuse of such packaging products, re...

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Problems solved by technology

The biodegradability of such products is low, paper recycling is difficult, and the cost of recycling is higher than the value of recycled pulp. Many paper mills abandon the recycling of such packaging products, resulting in waste of resources and environmental pollution.

[0003] There are many high-barrier water-based coatings on the market, but the mechanical properties of the coating formed by coating are poor

Especially when it is used on cardboard, the coating layer of the cardboard will be damaged by die-cutting, creasing and other processes, causing the folds to permeate and lose the barrier function. This defect limits the application of this type of coating

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