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Easy-to-pulping die-cutting high-barrier food coating paperboard and preparation method thereof

A high-barrier, cloth card paper technology, applied in the field of coated paper, can solve problems such as environmental pollution, difficulty in paper recycling, and low biodegradability

Active Publication Date: 2020-07-07
SHANGHAI ZIDAN FOOD PACKAGING & PRINTING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Easy-to-pulping die-cutting high-barrier food coating paperboard and preparation method thereof
  • Easy-to-pulping die-cutting high-barrier food coating paperboard and preparation method thereof
  • Easy-to-pulping die-cutting high-barrier food coating paperboard and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An easy-to-pulp die-cuttable high-barrier food-coated cardboard including 350g / m 2 Cardboard substrate, the surface of the cardboard substrate is coated with two layers of water-based composite coating, and the water-based composite coating is composed of polyvinyl alcohol PVA1788 aqueous solution and isopropyl acrylic acid copolymerized acrylic acid sequentially coated on the paper substrate The film layer composed of methyl ester emulsion and the existing high-barrier emulsion film layer on the market. The high barrier emulsion is BASF Epotal SP-222D.

[0021] The coating film layer of polyvinyl alcohol in this embodiment adopts PVA1788. The coating layer of polyacrylate adopts isopropyl acrylate copolymerized methyl acrylate emulsion with an average molecular weight of 180,000 and a glass transition temperature of -20°C. The dry weight ratio of polyvinyl alcohol and isopropyl acrylate copolymerized methyl acrylate is 1:5, and the coating amount of the first layer i...

Embodiment 2

[0026] An easy-to-pulp die-cuttable high-barrier food-coated cardboard consisting of 260g / m 2 Cardboard substrate, the surface of the cardboard substrate is coated with two layers of water-based composite coating, the water-based composite coating is composed of polyvinyl alcohol PVA1799 aqueous solution and butyl acrylate copolymerized methyl It consists of a coating layer compounded with methyl acrylate emulsion and an existing high-barrier emulsion coating layer on the market. The high barrier emulsion is Henkel YODOSOL GD900.

[0027] The coating film layer of polyvinyl alcohol in this embodiment adopts PVA1799. The coating layer of polyacrylate adopts butyl acrylate copolymerized methyl methacrylate emulsion, the average molecular weight is 210,000, and the glass transition temperature is -7°C. The dry weight ratio of polyvinyl alcohol and isopropyl acrylate copolymerized methyl acrylate is 1:1, and the coating amount of the first layer is dry dry 5g / m 2 (dry weight). ...

Embodiment 3

[0051] This example is basically the same as Example 1, except that in this example, isooctyl acrylate is used as the soft monomer of the polyacrylate emulsion with a low glass transition temperature.

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Abstract

The invention relates to an easy-to-pulping die-cutting high-barrier food coating paperboard and a preparation method thereof. The coated paper comprises a paperboard base material, wherein the surface of the paperboard base material is coated with two layers of water-based composite coatings, and each water-based composite coating is composed of a film coating layer compounded by a polyvinyl alcohol aqueous solution and polyacrylate emulsion with low glass-transition temperature and a film coating layer of emulsion with high barrier property, which are sequentially coated on the paperboard base material; during preparation, a polyvinyl alcohol aqueous solution and polyacrylate emulsion compound solution with low glass-transition temperature coat one surface of a paperboard base material for one time, then the paperboard base material is dried and is coated with a high-barrier emulsion for the second time, and the paper is dried and cooled to obtain the coated paper. Compared with theprior art, the coating disclosed by the invention is small in molecular elongation, relatively crisp in texture, low in strength, easy to naturally crush, convenient for waste paper recycling, pulpingand reusing, and beneficial to ecological balance and environmental protection.

Description

technical field [0001] The invention relates to a coated paper, in particular to an easy-to-pulp die-cut high-barrier food coated cardboard and a preparation method thereof. Background technique [0002] Coated paper, also known as white plastic paper and anti-seepage paper, is mainly used to make paper boxes, paper cups, paper bags and packaging for food. Coated paper is a composite material prepared by melting and coating plastic particles (usually PE or PP) on the surface of paper through a casting machine at high temperature, and then going through processes such as pressing, cooling, and winding. 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 give up 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/20D21H19/82D21H21/14C08F220/18C08F220/14
CPCD21H19/824D21H19/20D21H21/14C08F220/18Y02A40/90
Inventor 于广伟陈德苍何从友彭翠玲
Owner SHANGHAI ZIDAN FOOD PACKAGING & PRINTING CO LTD
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