Nanocellulose coating agent and eco-friendly nanocellulose packaging material using same

Abstract

The present invention relates to a nanocellulose coating agent and an eco-friendly nanocellulose packaging material using same. The nanocellulose coating agent of the present invention comprises nanocellulose, water, and an additive.

Description

Nanocellulose coating agent and eco-friendly nanocellulose packaging material using the same

[0001] The present invention relates to a nanocellulose coating agent and an eco-friendly nanocellulose packaging material using the same.

[0002] Conventional packaging materials, often multilayered composites or plastics with aluminum or aluminum-deposited films, possess excellent properties to block moisture and oxygen. However, the inclusion of aluminum in these packaging materials presents a challenge: they are impossible to recycle. Furthermore, conventional packaging materials fail to decompose after disposal in the natural environment, causing serious environmental pollution. These issues have led to a growing need for packaging materials, including regulations on plastics. Therefore, there is a growing demand for packaging materials that do not contain aluminum, yet possess sufficient barrier properties to protect the contents or food from spoilage and are biodegradable / biodegradable in natural environments. Furthermore, the global demand for environmental friendliness has recently become increasingly important, and the demand for eco-friendly packaging materials is also on the rise in Korea.

[0003] An eco-friendly alternative can be produced by coating a coating solution containing nanocellulose on a plastic film. However, although existing nanocellulose has excellent barrier properties, it is not easy to coat, and when coated on plastic, problems such as peeling and uneven film production occur.

[0004] The background technology described above is technology that the inventor possessed or acquired in the process of deriving the disclosure of the present application, and cannot necessarily be said to be publicly known technology disclosed to the general public prior to the present application.

[0005] To solve the above-described problem, the present invention aims to provide a nanocellulose coating agent and an eco-friendly nanocellulose packaging material using the same.

[0006] Specifically, according to the present invention, a method for manufacturing an eco-friendly nanocellulose packaging material having excellent barrier properties by coating a coating agent containing nanocellulose that can be applied uniformly and stably on a plastic film, and an eco-friendly nanocellulose packaging material are provided.

[0007] However, the problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by a person having ordinary skill in the relevant technical field from the description below.

[0008] The nanocellulose coating agent of the present invention comprises nanocellulose; water; and an additive.

[0009] In one embodiment, the nanocellulose may comprise a nanocellulose hydrogel, a nanocellulose slurry, or both.

[0010] According to one embodiment, in the coating agent, the nanocellulose may be present in an amount of 0.1 wt% to 10 wt%, and the additive may be present in an amount of 0.1 wt% to 10 wt%.

[0011] In one embodiment, the additive may include an emulsifier, a thickener, and a surfactant.

[0012] According to one embodiment, based on 100 parts by weight of the nanocellulose, the emulsifier and the thickener may each be in an amount of 10 to 100 parts by weight.

[0013] According to one embodiment, the surfactant may be present in an amount of 20 to 100 parts by weight based on 100 parts by weight of the nanocellulose.

[0014] In one embodiment, the surfactant may include at least one selected from the group consisting of ethanol, sorbitan esters (Span), ethoxylated sorbitan esters (Tween), alkyl polyglucosides (APG), alkyl glucamides (AG), and sugar esters (SE).

[0015] The nanocellulose packaging material of the present invention comprises a substrate layer; and a coating layer formed on the substrate layer; wherein the coating layer may include a nanocellulose coating agent.

[0016] According to one embodiment, the substrate layer may include at least one selected from the group consisting of polyethylene terephthalate (PET), polybutylene adipate terephthalate (PBAT), polybutylene succinate (PBS), polyhydroxy aldehyde (PHA), polylactic acid (PLA), thermoplastic starch (TPS), polyvinyl alcohol (PVA), polycaprolactam (PCL), polyethylene (PE), polypropylene (PP), Oxo-PE, Oxo-PP, Bio-PE, Bio-PP, Bio-PET, ethylene vinyl acetate (EVA), ethylene vinyl alcohol (EVOH), polyvinylidene chloride (PVDC), and nylon.

[0017] In one embodiment, the nanocellulose packaging material is adhesive-free and has a gas permeability of 0.01 cc·mil / m 2 ·It may be less than a day.

[0018] According to one embodiment, the coating layer may be 5 to 20 parts by weight based on 100 parts by weight of the nanocellulose packaging material, and the thickness of the coating layer may be 0.5 ㎛ to 10 ㎛.

[0019] According to one embodiment, the thickness ratio of the substrate layer to the coating layer may be 100:1 to 5:1.

[0020] The method for manufacturing a nanocellulose packaging material of the present invention comprises the steps of: preparing a nanocellulose coating agent; coating the nanocellulose coating agent on a substrate to form a coating layer; and drying the substrate on which the coating layer is formed.

[0021] According to one embodiment, the step of forming the coating layer may be forming the coating layer by a spin coating method, a spray coating method, a slot die coating method, a gravure coating method, a bar coating method, or a blade coating method.

[0022] According to one embodiment, the step of drying the substrate on which the coating layer is formed may be performed at a temperature of 25° C. to 110° C. for 15 minutes to 2 hours.

[0023] The present invention can provide a nanocellulose coating agent and a method for manufacturing an eco-friendly nanocellulose packaging material using the same, and an eco-friendly nanocellulose packaging material manufactured therefrom.

[0024] The present invention produces a film with excellent gas barrier properties containing a nanocellulose coating agent, which can replace the difficult-to-recycle layers currently used in retrofit packaging. This allows for the production of eco-friendly packaging that enhances the recyclability of packaging materials. Furthermore, because the coating stability is improved, it can be coated on various substrates, and the present invention can contribute to the production of various types of food packaging materials. The introduction of a scalable coating method or the use of a mass-production coating method for eco-friendly nanocellulose packaging materials has the advantage of facilitating the commercialization of eco-friendly nanocellulose packaging materials.

[0025] Figure 1 shows a graph of gas permeability of packaging materials according to examples and comparative examples of the present invention.

[0026] Figure 2 is an actual image of an eco-friendly nanocellulose packaging material according to the present invention.

[0027] Figure 3a is an actual image of a slot die in which a nanocellulose coating agent is coated on a substrate according to the present invention, and Figure 3b is an actual image in which coating with a nanocellulose coating agent on a substrate is completed.

[0028] Fig. 4a is an actual image of a slot die coating machine according to the present invention, showing a side view of the entire machine, Fig. 4b is a front view of the entire machine, Fig. 4c is a side view of the slot die, and Fig. 4d is a front view of the slot die.

[0029] Hereinafter, embodiments are described in detail with reference to the attached drawings. However, the embodiments may be modified in various ways, and the scope of the patent application is not limited or restricted by these embodiments. It should be understood that all modifications, equivalents, or alternatives to the embodiments are included within the scope of the patent application.

[0030] The terms used in the examples are for illustrative purposes only and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "comprise" or "have" are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but should be understood to not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0031] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments pertain. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0032] In addition, when describing with reference to the attached drawings, the same components will be given the same reference numerals regardless of the drawing numbers, and redundant descriptions thereof will be omitted. When describing an embodiment, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the embodiment, the detailed description thereof will be omitted. In addition, when describing a component of an embodiment, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only to distinguish the component from other components, and the nature, order, or sequence of the component is not limited by the terms. When a component is described as being "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but another component may also be "connected," "coupled," or "connected" between each component.

[0033] Components included in one embodiment and components with common functions will be described using the same names in other embodiments. Unless otherwise stated, the descriptions given in one embodiment can be applied to other embodiments, and detailed descriptions will be omitted to the extent of overlap.

[0034]

[0035] The nanocellulose coating agent of the present invention comprises nanocellulose; water; and an additive.

[0036] Conventional nanocellulose has excellent barrier properties, but it is not easy to coat, and when coated on plastic, there are problems such as peeling and uneven film formation.

[0037] According to one embodiment, the nanocellulose coating agent of the present invention can be applied uniformly and stably, has excellent coatability, and can be coated using a mass-production coating technique, so that when the coating agent is coated on a plastic film, an eco-friendly nanocellulose packaging material with excellent barrier properties can be manufactured, and commercialization of the packaging material can be facilitated.

[0038]

[0039] In one embodiment, the nanocellulose may comprise a nanocellulose hydrogel, a nanocellulose slurry, or both.

[0040] In one embodiment, the nanocellulose hydrogel may be prepared by chemical treatment and the nanocellulose slurry may be prepared by enzymatic treatment.

[0041] Nanocellulose possesses diverse properties, including high strength and surface area, low thermal deformation, and excellent dimensional stability. Consequently, it offers superior mechanical properties and high safety compared to other materials, making it a valuable packaging material. Furthermore, it can contribute to carbon neutrality and, through its biodegradability, provide eco-friendly packaging. In particular, it can be used as a coating agent for food packaging. It can address the environmental pollution caused by conventional synthetic polymers and, by addressing their poor physical properties, offer a novel, eco-friendly alternative to existing food packaging.

[0042]

[0043] According to one embodiment, in the coating agent, the nanocellulose may be present in an amount of 0.1 wt% to 10 wt%, and the additive may be present in an amount of 0.1 wt% to 10 wt%.

[0044] In one embodiment, in the coating agent, the nanocellulose may be present in an amount of 0.1 wt% to 10 wt%; 0.1 wt% to 8 wt%; 0.1 wt% to 6 wt%; 0.1 wt% to 4 wt%; 0.1 wt% to 2 wt%; 0.1 wt% to 1 wt%; 0.1 wt% to 0.5 wt%; 0.5 wt% to 10 wt%; 1 wt% to 10 wt%; 3 wt% to 10 wt%; 5 wt% to 10 wt%; 7 wt% to 10 wt%; 9 wt% to 10 wt%; 0.5 wt% to 3 wt%; 1 wt% to 4 wt%; 3 wt% to 7 wt%.

[0045] According to one embodiment, among the coating agents, if the nanocellulose is less than 0.1 wt%, there may be a problem in securing barrier properties, and if it is more than 10 wt%, there may be a problem in coating properties on the substrate.

[0046] In one embodiment, in the coating agent, the additive may be present in an amount of 0.1 wt% to 10 wt%; 0.1 wt% to 8 wt%; 0.1 wt% to 6 wt%; 0.1 wt% to 4 wt%; 0.1 wt% to 2 wt%; 0.1 wt% to 1 wt%; 0.1 wt% to 0.5 wt%; 0.5 wt% to 10 wt%; 1 wt% to 10 wt%; 3 wt% to 10 wt%; 5 wt% to 10 wt%; 7 wt% to 10 wt%; 9 wt% to 10 wt%; 0.5 wt% to 3 wt%; 1 wt% to 4 wt%; 3 wt% to 7 wt%.

[0047] In one embodiment, among the coating agents, the additive may have a problem with coatability if the weight % is outside the above range.

[0048]

[0049] In one embodiment, the additive may include an emulsifier, a thickener, and a surfactant. The emulsifier may increase the compatibility of the nanocellulose and the surfactant included in the nanocellulose coating agent of the present invention. The thickener may increase the viscosity of the nanocellulose coating agent of the present invention, thereby helping to improve the coatability. The surfactant may improve the coatability on the packaging substrate of the present invention.

[0050] In one embodiment, the nanocellulose coating may be manufactured by mixing nanocellulose, water, and an additive. The nanocellulose coating may be manufactured by mixing through a high-speed homogenizer, and the speed of the high-speed homogenizer may be 1000 RPM to 10000 RPM or less, and the mixing time may not exceed 5 minutes. The nanocellulose coating may be manufactured by re-mixing through a high-pressure homogenizer for further homogenization and nano-ization of the nanocellulose coating mixed through the high-speed homogenizer. The nanocellulose coating may be manufactured by performing a finishing treatment of removing air contained in the re-mixed nanocellulose coating through a centrifugal deaerator.

[0051]

[0052] According to one embodiment, based on 100 parts by weight of the nanocellulose, the emulsifier and the thickener may each be in an amount of 10 to 100 parts by weight.

[0053] According to one embodiment, based on 100 parts by weight of the nanocellulose, the emulsifier and the thickener are each present in an amount of 10 parts by weight to 100 parts by weight; 10 parts by weight to 90 parts by weight; 10 parts by weight to 80 parts by weight; 10 parts by weight to 70 parts by weight; 10 parts by weight to 60 parts by weight; 10 parts by weight to 50 parts by weight; 10 parts by weight to 40 parts by weight; 10 parts by weight to 30 parts by weight; 10 parts by weight to 20 parts by weight; 20 parts by weight to 100 parts by weight; 30 parts by weight to 100 parts by weight; 40 parts by weight to 100 parts by weight; 50 parts by weight to 100 parts by weight; 60 parts by weight to 100 parts by weight; 70 parts by weight to 100 parts by weight; 80 parts by weight to 100 parts by weight; It may be 90 parts by weight to 100 parts by weight.

[0054] According to one embodiment, when the emulsifier is less than 10 parts by weight based on 100 parts by weight of the nanocellulose, there may be a problem with the miscibility of the nanocellulose and the surfactant, and when it is more than 100 parts by weight, there may be a problem with reduced gas barrier properties.

[0055] According to one embodiment, based on 100 parts by weight of the nanocellulose, if the thickener is less than 10 parts by weight, there may be a problem with the coatability due to low viscosity, and if it is more than 100 parts by weight, there may be a problem with the coatability due to low flowability.

[0056]

[0057] According to one embodiment, the surfactant may be present in an amount of 20 to 100 parts by weight based on 100 parts by weight of the nanocellulose.

[0058] According to one embodiment, based on 100 parts by weight of the nanocellulose, the surfactant may be present in an amount of 20 parts by weight to 100 parts by weight; 30 parts by weight to 100 parts by weight; 40 parts by weight to 100 parts by weight; 50 parts by weight to 100 parts by weight; 60 parts by weight to 100 parts by weight; 70 parts by weight to 100 parts by weight; 80 parts by weight to 100 parts by weight; 90 parts by weight to 100 parts by weight; 20 parts by weight to 90 parts by weight; 20 parts by weight to 80 parts by weight; 20 parts by weight to 70 parts by weight; 20 parts by weight to 60 parts by weight; 20 parts by weight to 50 parts by weight; 20 parts by weight to 40 parts by weight; 20 parts by weight to 30 parts by weight.

[0059] According to one embodiment, based on 100 parts by weight of the nanocellulose, if the surfactant is less than 20 parts by weight, there may be a problem with the coating property, and if it is more than 100 parts by weight, there may be a problem with the gas barrier property being reduced.

[0060]

[0061] In one embodiment, the surfactant may include at least one selected from the group consisting of ethanol, sorbitan esters (Span), ethoxylated sorbitan esters (Tween), alkyl polyglucosides (APG), alkyl glucamides (AG), and sugar esters (SE).

[0062]

[0063] The nanocellulose packaging material of the present invention comprises a substrate layer; and a coating layer formed on the substrate layer; wherein the coating layer may include a nanocellulose coating agent.

[0064] Figure 2 is an actual image of an eco-friendly nanocellulose packaging material according to the present invention.

[0065] According to one embodiment, the coating layer may be coated on the substrate layer. The coating layer may perform a barrier function to preserve the contents within the packaging material by blocking gas and moisture from the outside of the packaging material. The coating layer may be formed by coating a nanocellulose coating agent on the surface of the substrate layer. In the case of multilayer films constituting conventional packaging materials, films of different materials, such as aluminum thin films, were used to prevent deterioration of items stored inside. However, the packaging material according to one embodiment performs the gas and moisture barrier function through the coating layer coated on the surface of the substrate layer. Therefore, the packaging material can be recycled without a separate process to remove different materials, such as aluminum, during the post-use treatment of the eco-friendly packaging material, thereby achieving a high eco-friendliness effect.

[0066]

[0067] According to one embodiment, the substrate layer may include at least one selected from the group consisting of polyethylene terephthalate (PET), polybutylene adipate terephthalate (PBAT), polybutylene succinate (PBS), polyhydroxy aldehyde (PHA), polylactic acid (PLA), thermoplastic starch (TPS), polyvinyl alcohol (PVA), polycaprolactam (PCL), polyethylene (PE), polypropylene (PP), Oxo-PE, Oxo-PP, Bio-PE, Bio-PP, Bio-PET, ethylene vinyl acetate (EVA), ethylene vinyl alcohol (EVOH), polyvinylidene chloride (PVDC), and nylon.

[0068]

[0069] In one embodiment, the nanocellulose packaging material is adhesive-free and has a gas permeability of 0.01 cc·mil / m 2 ·It may be less than a day.

[0070] Figure 1 shows a graph of gas permeability of packaging materials according to examples and comparative examples of the present invention.

[0071] Referring to Figure 1, the gas permeability graphs of PET Film as a comparative example, T-CNF coating solution on PET Film, and E-CNF coating solution on PET Film as examples are shown. The gas permeability was measured using Ox-Tran 2 / 22 from Mocon according to the standard of ASTM D3985. The gas permeability of the comparative example is 58.81 cc·mil / m 2 ·day, the gas permeability of the example is 0.082 cc·mil / m 2 ·day and 0.004 cc·mil / m 2 ·day was shown. Low gas permeability means high gas barrier property, and it can be confirmed that the gas barrier property of the example is improved by approximately 14,627 times compared to the comparative example.

[0072] According to one embodiment, when the gas permeability of the nanocellulose packaging material satisfies the above range, the freshness of food within the packaging material can be maintained and the shelf life can be improved, thereby exhibiting excellent properties as a food packaging material. In addition, when the nanocellulose packaging material has a permeability value within the above numerical range, it helps prevent external oxygen from entering and reacting with the contents, and as a packaging material, it minimizes denaturation of the contents, thereby enabling stable storage.

[0073] According to one embodiment, if the gas permeability of the nanocellulose packaging material is outside the above range, the packaging material may not have a barrier property that can be used as a packaging material, and in the case of food packaging, the preservation of the contents may be reduced, or in the case of industrial packaging, the moisture blocking effect may be reduced, which may cause accelerated corrosion of parts.

[0074] According to one embodiment, the nanocellulose packaging material is adhesive-free and consists only of a substrate layer and a coating layer formed on the substrate layer, so that it can have excellent recyclability.

[0075] In one embodiment, the nanocellulose packaging material is adhesive-free, and the adhesive may include at least one selected from the group consisting of solvent-free, ethyl acetate (EA), methyl ethyl ketone (MEK), toluene, isopropyl alcohol (IPA), methanol, cyclohexane, and acetone. The adhesive may be a hazardous substance regulated by the Chemical Substances Control Act, the Ministry of Food and Drug Safety, etc. The present invention may have environmentally friendly characteristics and excellent economic effects by not including an adhesive.

[0076]

[0077] According to one embodiment, the coating layer may be 5 to 20 parts by weight based on 100 parts by weight of the nanocellulose packaging material, and the thickness of the coating layer may be 0.5 ㎛ to 10 ㎛.

[0078] According to one embodiment, the coating layer may be in an amount of 5 parts by weight to 20 parts by weight, 5 parts by weight to 18 parts by weight, 5 parts by weight to 16 parts by weight, 5 parts by weight to 14 parts by weight, 5 parts by weight to 12 parts by weight, 5 parts by weight to 10 parts by weight, 5 parts by weight to 8 parts by weight, 5 parts by weight to 7 parts by weight, 7 parts by weight to 20 parts by weight, 9 parts by weight to 20 parts by weight, 11 parts by weight to 20 parts by weight, 13 parts by weight to 20 parts by weight, 15 parts by weight to 20 parts by weight, 17 parts by weight to 20 parts by weight, 10 parts by weight to 15 parts by weight, based on 100 parts by weight of the nanocellulose packaging material.

[0079] According to one embodiment, when the coating layer is less than 5 parts by weight based on 100 parts by weight of the nanocellulose packaging material, there may be a problem of reduced gas barrier properties, and when it is more than 20 parts by weight, there may be a problem of cracking of the packaging material due to weight.

[0080] According to one embodiment, the thickness of the coating layer may be 0.5 μm to 10 μm; 1 μm to 10 μm; 3 μm to 10 μm; 4 μm to 10 μm; 5 μm to 10 μm; 6 μm to 10 μm; 7 μm to 10 μm; 8 μm to 10 μm; 9 μm to 10 μm; 0.5 μm to 9 μm; 0.5 μm to 8 μm; 0.5 μm to 7 μm; 0.5 μm to 6 μm; 0.5 μm to 5 μm; 0.5 μm to 4 μm; 0.5 μm to 3 μm; 0.5 to 2 μm; 3 μm to 5 μm; 4 μm to 6 μm; 5 μm to 8 μm.

[0081] According to one embodiment, if the thickness of the coating layer is less than 0.5 ㎛, there may be a problem of reduced gas barrier properties due to inclusion of air bubbles when manufacturing the packaging material, and if it exceeds 10 ㎛, there may be a problem of uneven thickness of the packaging material due to excessive coating application when manufacturing the packaging material.

[0082]

[0083] According to one embodiment, the thickness ratio of the substrate layer to the coating layer may be 100:1 to 5:1.

[0084] According to one embodiment, the thickness ratio of the substrate layer: the coating layer is 100:1 to 5:1; 90:1 to 5:1; 80:1 to 5:1; 70:1 to 5:1; 50:1 to 5:1; 30:1 to 5:1; 20:1 to 5:1; 10:1 to 5:1; 7:1 to 5:1; 100:1 to 10:1; 100:1 to 20:1; 100:1 to 30:1; 100:1 to 40:1; 100:1 to 50:1; 100:1 to 60:1; 100:1 to 70:1; It may be 100:1 to 80:1; 100:1 to 90:1; 100:1 to 95:1;

[0085] According to one embodiment, if the thickness ratio of the substrate layer: the coating layer is outside the above range, defects such as bubbles and cracks may occur during the manufacturing of the packaging material, which may result in a problem of reduced gas barrier properties.

[0086]

[0087] The method for manufacturing a nanocellulose packaging material of the present invention comprises the steps of: preparing a nanocellulose coating agent; coating the nanocellulose coating agent on a substrate to form a coating layer; and drying the substrate on which the coating layer is formed.

[0088] Figure 3a is an actual image of a slot die in which a nanocellulose coating agent is coated on a substrate according to the present invention, and Figure 3b is an actual image in which coating with a nanocellulose coating agent on a substrate is completed.

[0089] Fig. 4a is an actual image of a slot die coating machine according to the present invention, showing a side view of the entire machine, Fig. 4b is a front view of the entire machine, Fig. 4c is a side view of the slot die, and Fig. 4d is a front view of the slot die.

[0090] Referring to FIGS. 3a and 3b, in the step of forming a coating layer by coating the nanocellulose coating agent on a substrate, a slot die coating technique was used, the width of the slot die coater was 50 mm or more and 350 mm or less, the speed of the movable substrate was 1 mm / s or more and 50 mm / s or less, and the distance between the substrate and the slot die coater was 100 um or more and 2000 um or less, and the nanocellulose coating agent was coated on the substrate to form a coating layer.

[0091] Transfer a coating containing nanocellulose (50 mL to 1,000 mL) into a syringe and install it on a syringe pump. Set the syringe pump flow rate to 0.1 mL / min to 30 mL / min. You can see the coating containing nanocellulose being applied to a plastic film placed on a movable substrate, creating an eco-friendly packaging material.

[0092]

[0093] According to one embodiment, the step of forming the coating layer may be forming the coating layer by a spin coating method, a spray coating method, a slot die coating method, a gravure coating method, a bar coating method, or a blade coating method.

[0094] According to one embodiment, the step of forming the coating layer can introduce a scalable coating method for mass production of eco-friendly nanocellulose packaging materials by using the nanocellulose coating agent of the present invention, which can be uniformly and stably applied and thus has improved coating stability. In addition, there is an advantage in that a mass-production coating method such as spin coating, spray coating, slot die coating, gravure coating, bar coating, or blade coating can be used, thereby facilitating the commercialization of eco-friendly nanocellulose packaging materials.

[0095]

[0096] According to one embodiment, the step of drying the substrate on which the coating layer is formed may be performed at a temperature of 25° C. to 110° C. for 15 minutes to 2 hours.

[0097] According to one embodiment, the step of drying the substrate on which the coating layer is formed may be performed for 15 minutes to 2 hours; 30 minutes to 2 hours; 45 minutes to 2 hours; 60 minutes to 2 hours; 75 minutes to 2 hours; 90 minutes to 2 hours; 105 minutes to 2 hours; 15 minutes to 105 minutes; 15 minutes to 90 minutes; 15 minutes to 75 minutes; 15 minutes to 60 minutes; 15 minutes to 45 minutes; 15 minutes to 30 minutes.

[0098] According to one embodiment, if the step of drying the substrate on which the coating layer is formed is performed for less than 15 minutes, there may be a problem that the coating agent is not completely dried, and if it is performed for more than 2 hours, there may be a problem that the coating layer is hardened and peels off from the substrate.

[0099] According to one embodiment, the step of drying the substrate on which the coating layer is formed may be performed at a temperature of 25°C to 110°C; 35°C to 110°C; 45°C to 110°C; 55°C to 110°C; 65°C to 110°C; 75°C to 110°C; 85°C to 110°C; 95°C to 110°C; 105°C to 110°C; 25°C to 100°C; 25°C to 90°C; 25°C to 80°C; 25°C to 70°C; 25°C to 60°C; 25°C to 50°C; 25°C to 40°C; 25°C to 30°C.

[0100] According to one embodiment, the step of drying the substrate on which the coating layer is formed; if performed at a temperature lower than 25°C, there may be a problem that the drying time becomes longer and production efficiency decreases, and if performed at a temperature higher than 110°C, there may be a problem that the substrate becomes deformed due to heat.

[0101]

[0102] Although the embodiments have been described above, those skilled in the art will appreciate that various technical modifications and variations can be applied based on the above. For example, appropriate results can still be achieved even if the described techniques are performed in a different order than described, and / or components of the described systems, structures, devices, circuits, etc. are combined or combined in a different manner than described, or are replaced or substituted with other components or equivalents.

[0103] Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims described below.

Claims

1. Nanocellulose; water; and containing additives; Nanocellulose coating agent.

2. In paragraph 1, The above nanocellulose comprises nanocellulose hydrogel, nanocellulose slurry or both. Nanocellulose coating agent.

3. In paragraph 1, Among the above coating agents, The above nanocellulose is 0.1 wt% to 10 wt%, The above additive is 0.1 wt% to 10 wt%, Nanocellulose coating agent.

4. In paragraph 1, The above additives include emulsifiers, thickeners and surfactants. Nanocellulose coating agent 5. In paragraph 4, Based on 100 parts by weight of the above nanocellulose, the emulsifier and the thickener are each 10 parts by weight to 100 parts by weight. Nanocellulose coating agent.

6. In paragraph 4, Based on 100 parts by weight of the above nanocellulose, The surfactant is, 20 to 100 parts by weight, Nanocellulose coating agent.

7. In paragraph 4, The surfactant comprises at least one selected from the group consisting of ethanol, sorbitan esters (Span), ethoxylated sorbitan esters (Tween), alkyl polyglucoside (APG), alkyl glucamide (AG), and sugar esters (SE). Nanocellulose coating agent.

8. Base layer; and A coating layer formed on the above substrate layer; The above coating layer comprises a nanocellulose coating agent, Nanocellulose packaging material.

9. In paragraph 8, The above-mentioned base layer includes at least one selected from the group consisting of PET (polyethylene terephthalate), PBAT (polybutylene adipate terephthalate), PBS (polybutylene succinate), PHA (polyhydroxy aldehyde), PLA (polylactic acid), TPS (thermoplastic starch), PVA (polyvinyl alcohol), PCL (polycaprolactam), PE (polyethylene), PP (polypropylene), Oxo-PE, Oxo-PP, Bio-PE, Bio-PP, Bio-PET, EVA (ethylene vinyl acetate), EVOH (ethylene vinyl alcohol), PVDC (polyvinylidene chloride), and nylon. Nanocellulose packaging material.

10. In paragraph 8, The above nanocellulose packaging material, It is adhesive-free, Gas permeability of 0.01 cc·mil / m 2 ·Day or less, Nanocellulose packaging material.

11. In paragraph 8, The above coating layer is 5 to 20 parts by weight based on 100 parts by weight of the nanocellulose packaging material, The thickness of the above coating layer is 0.5 ㎛ to 10 ㎛, Nanocellulose packaging material.

12. In paragraph 8, The thickness ratio of the above substrate layer: the above coating layer is 100:1 to 5:1, Nanocellulose packaging material.

13. Step of preparing a nanocellulose coating agent; A step of forming a coating layer by coating the nanocellulose coating agent on a substrate; and A step of drying the substrate on which the coating layer is formed; comprising; Method for manufacturing nanocellulose packaging material.

14. In paragraph 13, The step of forming the above coating layer; Forming a coating layer by spin coating, spray coating, slot die coating, gravure coating, bar coating or blade coating, Method for manufacturing nanocellulose packaging material.

15. In paragraph 13, The step of drying the substrate on which the coating layer is formed; It is performed at a temperature of 25 ℃ to 110 ℃ for 15 minutes to 2 hours, Method for manufacturing nanocellulose packaging material.

Images