Environment-friendly degradable waterproof coating packaging paper and preparation method thereof

Abstract

The invention relates to environment-friendly degradable waterproof coating packaging paper and a preparation method thereof. An inner layer, a middle layer and an outer layer sequentially coat a paper base material in a co-extrusion manner, wherein the inner layer contains a polyvinyl alcohol acid copolymer and thermoplastic starch, the middle layer contains polyvinyl alcohol, thermoplastic starch, a plasticizer, a compatilizer and other assistants, and the outer layer contains a degradable polyester copolymer, thermoplastic starch, polydioxane ketone, a plasticizer, a compatilizer and otherassistants. The packaging paper provided by the invention adopts natural renewable raw materials, has biodegradability, effectively reduces environmental pollution caused by plastic products, and hasthe advantages of water resistance, oil resistance, high heat sealing strength, excellent mechanical properties, no toxicity and no harm. The preparation process is simple and is suitable for industrial popularization and application.

Description

technical field [0001] The invention relates to the technical field of environment-friendly wrapping paper, in particular to an environment-friendly degradable waterproof coated wrapping paper and a preparation method thereof, in particular to a food wrapping paper which is waterproof, oil-proof, highly heat-sealable, non-toxic and harmless. Background technique [0002] Since the paper product itself cannot be waterproof and oil-proof, in order to achieve the purpose of waterproof and oil-proof, most cardboards are covered with plastic film during use, and the materials of the plastic film are such as low-density polyethylene LDPE, polyvinyl chloride PVC, polyparaphenylene, etc. Ethylene diformate PET, ethylene vinyl acetate copolymer EVA, etc. cannot be degraded by themselves after being discarded. Even if incineration is used, a large amount of waste gas will be generated during the combustion process, which will become a major source of environmental pollution. And these ...

AI Technical Summary

Problems solved by technology

[0002] Since the paper product itself cannot be waterproof and oil-proof, in order to achieve the purpose of waterproof and oil-proof, most cardboards are covered with plastic film during use, and the materials of the plastic film are such as low-density polyethylene LDPE, polyvinyl chloride PVC, polyparaphenylene, etc. Ethylene diformate PET, ethylene vinyl acetate copolymer EVA, etc. cannot be degraded by themselves after being discarded. Even if incineration is used, a large amount of waste gas will be generated during the combustion process, which will become a major source of environmental pollution. And these plastics The raw material of the film comes from petroleum, which is a non-renewable resource. Extensive use of plastic film will aggravate the energy crisis

[0003] With the continuous enhancement of people's awareness of environmental protection, biodegradable materials have gradually become a research hotspot to replace traditional plastic materials due to their environmental protection and regeneration characteristics, but these biodegradable materials cannot really achieve the dual effects of environmental protection and economy, such as polylactic acid PLA has good biodegradability and mechanical properties, but it is hard and brittle at room temperature, has extremely low elongation at break and impact strength, and cannot form a film. Polyvinyl alcohol PVA can be used as a carbon source and energy by bacteria. Excellent oil resistance and gas barrier properties, but its production process is complex and costly. Polybutylene terephthalate PBAT has good flexibility, but its heat sealing performance is poor, its texture is soft, and it is easy to deform when stretched. Greatly limits the promotion and application of environmentally friendly degradable materials in the packaging field

[0004] At present, most of the environmentally friendly and degradable packaging papers prepared at home and abroad are modified by copolymerization and / or blending of various biodegradable materials, which improves the mechanical properties, but the waterproof and oil-proof performance is poor, and the heat-sealing strength is not enough. The cost is also higher and cannot compete with ordinary plastic wrapping paper in the market

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