Environment-friendly high-barrier coating composition for aluminum-free backing paper and preparation method thereof

Abstract

The invention discloses an environment-friendly high-barrier coating composition for aluminum-free backing paper and a preparation method thereof; the coating composition comprises the following components in parts by weight: 30-55 parts of self-crosslinking acrylic emulsion, 20-35 parts of water-based polyurethane, 10-25 parts of co-solvent, 15-40 parts of deionized water, 0.2 part of wetting agent, 0.2 part of leveling agent, and 0.1 part of defoamer. When preparing, put the self-crosslinking acrylic emulsion and water-based polyurethane into the reaction kettle, and stir evenly at a low speed; after mixing the cosolvent and deionized water evenly, stir them into the reaction kettle, and stir at a low speed; add the wetting agent and leveling agent in turn, Stir at medium speed; add defoamer, stir at high speed, and filter. The coating formed by the coating composition of the present invention has excellent barrier properties and stable barrier properties, and only needs to be coated once (thickness ≥ 3 μm) to meet the barrier properties requirements. The coating application equipment is simple and no special coating equipment is required.

Description

technical field [0001] The invention relates to the field of water-based coatings, in particular to an environment-friendly high-barrier coating composition for aluminum-free backing paper and a preparation method thereof. Background technique [0002] As one of the important components of cigarette packaging materials, the lining paper mainly plays the role of preserving aroma and preventing moisture. Therefore, the lining paper is required to have a certain barrier property to air and water vapor; currently, the cigarette lining paper mainly includes aluminum foil composite inner There are three types of lining, transfer aluminum lining, and vacuum direct plating lining. The common point of the three is that they all contain a layer of aluminum to achieve the barrier effect. But there are the following deficiencies: (1) all consume non-ferrous metal aluminum, especially aluminum foil composite smoke lining, and aluminum is a non-renewable resource; (2) the product cannot b...

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Problems solved by technology

But there are the following deficiencies: (1) all consume non-ferrous metal aluminum, especially aluminum foil composite smoke lining, and aluminum is a non-renewable resource; (2) the product cannot be completely degraded after use, and the use of aluminum is difficult to recycle, resulting in waste of resources; (3) The equipment used in the production of aluminum foil or aluminum plating process has high cost and large power consumption; (4) the production process is complicated and the cost is high;

[0004] Through the search of existing documents, it is found that Chinese patent CN102966001 discloses an aluminum-free cigarette liner and its production method. Its barrier property is mainly determined by polyvinyl alcohol and agar in the barrier layer, but due to the water absorption of polyvinyl alcohol, Its barrier properties will be greatly reduced in high humidity environment; in addition, the addition of agar will lead to high viscosity or even gelation of the coating, which requires special equipment (reverse coating) to coat; Chinese patent CN102943416 discloses a coating with high barrier properties Easy-to-degradable cigarette lining paper, its barrier layer contains polyvinylidene chloride (PVDC), PVDC contains chlorine, will produce chlorine gas, dioxin and other toxic gases during waste incineration, and the thickness of the barrier layer is required >5μm, higher cost

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