CN-121719118-B - Beverage paper cup-to-seedling container system, preparation method and conversion method thereof, fluorine-free biodegradable barrier coating and barrier coating paper

CN121719118BCN 121719118 BCN121719118 BCN 121719118BCN-121719118-B

Abstract

The invention discloses a beverage paper cup transfer seedling container system, a preparation method and a conversion method thereof, a fluorine-free biodegradable barrier coating and barrier coating paper, and belongs to the technical field of green packaging and gardening seedling products. The system applies a special polyhydroxyalkanoate barrier coating on the inner wall of the paper cup and is matched with a unique opening structure, so that the function switching from a beverage container to a seedling container is realized. Compared with the commercial polyethylene coated paper cup, the scheme realizes more excellent barrier effect and processing toughness while reducing the addition amount of the film forming additive through the synergistic effect of the modified starch and the polysorbate. In addition, the invention strictly follows the environmental protection compliance requirement, and all components do not contain fluorine-containing substances, so that the environmental accumulation risk of the packaging material in the composting process is solved. Through the secondary utilization thought, the scheme not only reduces the resource investment in the seedling growing link, but also conforms to the industry development trend of green packaging and resource recycling in the future, and has remarkable social and economic benefits.

Inventors

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Assignees

都佰城新材料技术（上海）有限公司
博碳(上海)生物材料有限公司
中科联化有限公司
环涂士涂料有限公司
都佰城集团有限公司

Dates

Publication Date: 20260508
Application Date: 20260213

Claims (9)

1. A beverage paper cup to seedling container system, said container system comprising: a paper cup body, a paper cup body and a paper cup cover, the paper cup body comprises a cup wall and a cup bottom; The biodegradable barrier coating is arranged on the inner surface of the paper cup body, the film-forming polymer of the barrier coating comprises polyhydroxyalkanoate, and the aqueous phase stabilizer of the barrier coating is modified starch and/or sodium carboxymethyl cellulose, wherein the total organic fluorine content of the barrier coating measured by an oxygen bomb combustion-ion chromatography method is less than or equal to 5mg/kg; the transformation structure is used for enabling the paper cup body to be in a beverage mode when the primary beverage is contained and to be in a seedling raising mode when the secondary beverage is raised; The transformation structure comprises a water draining structure for opening the cup bottom, a root system penetrating guide structure for the cup wall and a cup height adjusting structure for the cup wall; the opening drainage structure comprises a drainage preset area arranged at the bottom of the cup and a biodegradable sealing component covering the drainage preset area, wherein the biodegradable sealing component seals the drainage preset area in a drink mode to realize sealing leakage prevention, and a drainage channel is formed by peeling the biodegradable sealing component in a seedling raising mode; the root system penetrating guide structure is arranged in the lower area or the circumferential area of the cup wall and comprises one or more of a longitudinal indentation weakening line, a semi-penetrating micropore array and/or a preset tearing window area, wherein the inner side biodegradable barrier coating of the cup wall in the area corresponding to the semi-penetrating micropore array continuously forms a film and has no penetrating defect, and the inner side biodegradable barrier coating of the preset tearing window area continuously forms a film and has no penetrating defect in a drink mode; The cup height adjusting structure is arranged in the upper area of the cup wall and is a circumferential tearing line, a circumferential folding line or a circumferential indentation line, wherein the cutting depth of the circumferential tearing line is smaller than the thickness of a base layer of the cup wallpaper and does not cut through the biodegradable barrier coating on the inner side of the cup wall, when the cup height adjusting structure is the circumferential tearing line, the cup wall on the upper portion of the cup opening is torn along the circumferential tearing line, when the cup height adjusting structure is the circumferential folding line or the circumferential indentation line, the upper portion of the cup opening is outwards folded along the circumferential folding line or the circumferential indentation line to form a reinforcing curled edge, and the biodegradable barrier coating comprises, in terms of dry coating solids and in parts by mass: 500 to 950 parts of polyhydroxyalkanoate film-forming component; 0 to 300 parts of a biodegradable polymer modified component which is a poly (adipic acid)/poly (butylene terephthalate) and/or poly (lactic acid); 30-130 parts of plasticizing and flexibility regulating component, wherein the plasticizing and flexibility regulating component is acetyl tributyl citrate; 0 to 50 parts of a hydrophobic barrier regulating component, wherein the hydrophobic barrier regulating component is carnauba wax; 0 to 100 parts of filler, wherein the filler is talcum powder and/or nano cellulose; 0.1 to 30 parts of auxiliary agent; Wherein the auxiliary agent comprises one or more of a water phase stabilizer, an emulsifying dispersion auxiliary agent, a dispersing agent, a wetting agent, a leveling agent, a defoaming agent, a thickening rheological agent and an anti-corrosion and mildew-proof agent; the aqueous phase stabilizer is modified starch and/or sodium carboxymethyl cellulose, and the emulsifying dispersion aid is polysorbate 80; The total organic fluorine content of the barrier coating measured by an oxygen bomb combustion-ion chromatography method is less than or equal to 5mg/kg.
2. The beverage paper cup rotary seedling raising container system according to claim 1, wherein said water draining structure is opened and comprises a water draining preset area arranged at the bottom of the cup, said water draining preset area is a prefabricated through hole area penetrating through the bottom paper layer of the cup; the prefabricated through hole area comprises 3 to 5 through holes, and the diameter of each through hole is 1.2mm to 1.8mm; the drainage preset area is closed by the biodegradable sealing member in a drink mode.
3. The beverage paper cup rotary seedling raising container system according to claim 1, wherein the biodegradable sealing component is a biodegradable sealing piece or a biodegradable sealing film, the biodegradable sealing component covers the drainage preset area and is attached to the outer surface of the cup bottom, and the biodegradable sealing component is in sealing connection with the outer surface of the cup bottom through heat sealing; the biodegradable sealing component is provided with a tearing tongue so as to be peeled off to form a drainage channel in a seedling raising mode; And the total organic fluorine content of the biodegradable sealing component measured by an oxygen bomb combustion-ion chromatography method is less than or equal to 5mg/kg.
4. The beverage paper cup rotary seedling raising container system according to claim 1, wherein the penetration depth of the semi-penetrating micropore array in the root system penetration guiding structure is smaller than the thickness of a base layer of the cup wallpaper, and the thickness of the base layer of the cup wallpaper is the thickness of the base layer of the cup wallpaper without the inner surface biodegradable barrier coating; the preset tearing window area in the root system penetrating guide structure is provided with a tearing guide line, and the root system penetrating guide structure is torn along the tearing guide line to form a root penetrating passage in a seedling raising mode.
5. The beverage paper cup transfer container system of claim 1 wherein the number of longitudinal or circumferential score lines is 4 to 8 and the score depth is 35% to 65% of the thickness of the cup wallpaper base layer.
6. The beverage paper cup transfer container system of claim 1 wherein said polyhydroxyalkanoate film forming component is selected from the group consisting of short chain polyhydroxyalkanoates, medium long chain polyhydroxyalkanoates, and copolymers between monomers that form short and medium long chain polyhydroxyalkanoates; The short-chain polyhydroxyalkanoate is selected from one or more of poly 3-hydroxybutyrate, poly 3-hydroxybutyrate-4-hydroxybutyrate copolymer and poly 3-hydroxybutyrate-3-hydroxyvalerate copolymer; the medium-long chain polyhydroxyalkanoate is selected from one or more of poly 3-hydroxycaproic acid ester, poly 3-hydroxyoctanoic acid ester and poly 3-hydroxydecanoic acid ester; the copolymer between the monomers forming the short-chain and medium-chain polyhydroxyalkanoates is selected from one or more of poly 3-hydroxybutyrate-3-hydroxyhexanoate copolymers.
7. A barrier coated paper comprising a paper-based material and the biodegradable barrier coating of claim 1 disposed on at least one side surface of the paper-based material; wherein the biodegradable polymer modified component comprises both poly (adipic acid)/poly (butylene terephthalate) and poly (lactic acid); The weight part of the acetyl tributyl citrate is 30-80 parts; The mass part of the carnauba wax is 20 to 50 parts; the filler comprises nanocellulose, and the mass part of the nanocellulose is 10 to 30 parts; A paper-philic base coat is also arranged between the surface of the paper-based material and the biodegradable barrier coating, and the paper-philic base coat comprises modified starch and/or sodium carboxymethyl cellulose.
8. A method of preparing the beverage paper cup transfer container system of claim 1, comprising the steps of: step 1, providing a paper-based material to obtain a paper-based material to be coated; Step 2, providing an aqueous dispersion containing polyhydroxyalkanoate, and mixing and dispersing the aqueous dispersion with the rest components of the biodegradable barrier coating according to claim 1 to obtain an aqueous coating liquid of which the aqueous phase stabilizer is modified starch and/or sodium carboxymethyl cellulose; step 3, applying the aqueous coating liquid obtained in the step 2 to at least one side surface of the paper base material to be coated obtained in the step 1 to obtain wet coated paper; step 4, drying the wet coated paper obtained in the step 3 to form a film to obtain barrier coated paper; step 5, forming the barrier coated paper obtained in the step 4 on a paper cup forming machine to obtain a paper cup body; Step 6, forming a drainage preset area at the cup bottom of the paper cup body obtained in the step 5, and forming a root penetration guide structure and a cup height adjusting structure on the cup wall to obtain the paper cup body provided with the conversion structure; Step 7, sealing the biodegradable sealing component on the outer surface of the cup bottom of the paper cup body provided with the conversion structure obtained in the step6 to cover a drainage preset area, so as to obtain a drink mode paper cup; Wherein the total organic fluorine content of the barrier coating paper and the biodegradable sealing component measured by an oxygen bomb combustion-ion chromatography method is less than or equal to 5mg/kg.
9. A method of converting a beverage paper cup to a container system for growing seedlings according to claim 1, said method comprising the steps of: step 1, providing a paper cup body in a beverage mode, and emptying the paper cup body after beverage use is completed to obtain a paper cup body to be converted; Step 2, peeling the biodegradable sealing component along a tearing tongue of the biodegradable sealing component to form a drainage channel in a drainage preset area at the bottom of the cup, so as to obtain a paper cup body with the drainage channel; Removing or folding the cup wall at the upper part of the cup mouth along a cup height adjusting structure of the cup wall to adjust the cup height, so as to obtain a cup body with the cup height adjusted, wherein the cup height adjusting structure is a circumferential tearing line, a circumferential folding line or a circumferential indentation line; And step 4, filling seedling raising matrix into the paper cup body with the cup height adjusted obtained in the step 3, and sowing or placing seedlings to obtain the paper cup container with the seedling raising mode.

Description

Beverage paper cup-to-seedling container system, preparation method and conversion method thereof, fluorine-free biodegradable barrier coating and barrier coating paper Technical Field The invention belongs to the technical field of green packaging and gardening seedling products, and particularly relates to a beverage paper cup seedling container system, a preparation method and a conversion method thereof, a fluorine-free biodegradable barrier coating and barrier coating paper. Background At present, a paper-based laminating process is generally adopted in the main-stream beverage paper cup on the market, namely, a layer of Polyethylene (PE) or polypropylene (PP) film is covered on the surface of paper through melt extrusion so as to realize the functions of water resistance, oil resistance and leakage prevention. However, the petroleum-based plastic coating is difficult to degrade in natural environment, and can also cause problems of high plastic paper separation cost, low fiber recovery rate and the like in the paper cup recovery process, carbon emission is generated if incineration treatment is carried out, and microplastic pollution is caused if landfill is carried out. In order to solve the above problems, biodegradable materials are introduced into the field of paper cup manufacturing. Polylactic acid (PLA) and poly (adipic acid)/butylene terephthalate (PBAT) are currently used as a more alternative material. However, PLA coated paper cups are poor in heat resistance, easy to deform when containing hot drinks, and the degradation rate of the PLA coated paper cups is very slow in natural soil or marine environment due to the fact that the PLA coated paper cups are usually dependent on industrial composting conditions (high temperature and high humidity), while PBAT is good in film forming property, but insufficient in rigidity and high in cost. In contrast, polyhydroxyalkanoate (PHA), which is a bio-polyester synthesized by microorganisms, has excellent biocompatibility, gas barrier property, and complete biodegradability in various environments such as soil, fresh water, and sea, and is considered to be an ideal next-generation green packaging material. Although PHA has a broad application prospect, the preparation of PHA into a high-performance aqueous paper-based barrier coating still faces a plurality of technical challenges. First, PHA has high crystallinity and strong hydrophobicity, and is difficult to disperse directly in aqueous phase to form stable emulsion system. In the prior art, polyvinyl alcohol (PVA) is usually introduced as protective colloid or stabilizer to assist in dispersion, but PVA contains a large amount of hydrophilic groups, so that the coating is extremely easy to absorb moisture and swell in a high-humidity environment, the wet strength and barrier property of the coating are seriously reduced, and the requirement of long-acting liquid containing cannot be met. Secondly, in order to impart excellent oil and grease resistance properties to paper cups (as required by Kit scale), conventional solutions often add perfluoro or polyfluoroalkyl substances (PFAS) as fluorine-containing auxiliaries. However, PFAS is known as a "permanent chemical", is extremely difficult to degrade in the environment and bioaccumulate, and increasingly stringent global environmental regulations (such as the european union REACH regulations) have begun to limit or prohibit its use in food contact materials. Therefore, developing a PHA aqueous barrier coating that is PVA-free, fluorine-free and stable in performance is a challenge for industry. On the other hand, with the rise of home gardening and urban agriculture, the demand of seedling containers has grown year by year. The traditional seedling raising pot is mostly made of Polystyrene (PS) or PE, so that white pollution is caused, air permeability is poor, a plant root system is easy to coil (nest root), the plant root system is required to be taken off during transplanting, the root system is extremely easily damaged, and transplanting shock is caused, so that the survival rate is influenced. Although some pulp molded seedling cups are on the market, the wet strength is usually insufficient, the seedling cups are easy to soften and collapse too early during seedling culture, or non-degradable adhesives are added for enhancing strength, so that root penetration is prevented after the seedling cups are buried. More importantly, a systematic scheme capable of effectively combining the functions of 'beverage packaging' and 'agricultural seedling raising' is lacking at present. The existing beverage paper cup is discarded after being used, so that huge waste of high-quality long-fiber pulp resources is caused. If the paper cup can be used for one-time use of beverage containing through the technical means, the paper cup can be directly changed into a seedling raising container with the functions of water drainage, ventilation, controllable degrada