KR102250885B1 - Method of water-soluble coating paper and water-soluble coating liquid containg biodegradable catalyst, viscosity increasing agent - Google Patents

Abstract

The present invention comprises the steps of preparing a prepolymer by mixing polyol, dimethylol propionic acid (DMPA) and isocyanate; Neutralizing the prepolymer with a neutralizing agent diluted in an N-methylpinolidone (NMP) solution; Adding distilled water to the neutralized prepolymer to disperse it, and then adding a chain extender to prepare a water-dispersible polyurethane; Adding an acrylic monomer, a biodegradation catalyst, a thickener, and an initiator to the water-dispersible polyurethane, followed by stirring to prepare a water-soluble acrylic polyurethane; and dispersing the clay treated with an organic agent in the water-soluble acrylic polyurethane. It relates to a method for preparing a nano-clay dispersion water-soluble acrylic polyurethane coating solution, wherein the coating solution prepared by the method has excellent oil resistance, water resistance, oxygen barrier property, moisture-proof property, printability, heat sealability, and alkali dissociation property and is regenerated (recycled). This easy-to-use eco-friendly food packaging material can be usefully used for coating.

Description

Method for producing water-soluble paper coating liquid and water-soluble coating paper containing biodegradation catalyst and thickener {METHOD OF WATER-SOLUBLE COATING PAPER AND WATER-SOLUBLE COATING LIQUID CONTAING BIODEGRADABLE CATALYST, VISCOSITY INCREASING AGENT}

The present invention relates to a biodegradation catalyst for replacing polyethylene (PE) coated paper, which is not easily recycled when discarded after use, a water-soluble paper coating solution containing a thickener, and a water-soluble coating paper manufacturing method, and in more detail, nano-dispersion technology, water-soluble It is an eco-friendly coating technology that has excellent oil resistance, water resistance, oxygen barrier property, printability, heat sealing property, alkali dissociation property, and easy regeneration (recycling) by applying a polymer, a biodegradation catalyst and a thickener.

With the development of modern society, plastic packaging and containers bring convenience in life with excellent functions and low prices, and have made a great contribution to industrial development throughout the industry, but plastic waste, which is the main component of food packaging, due to the problem of disposal after use. Is recognized as one of the largest sources of environmental pollution.

Polyethylene is generally coated inside various food containers for reasons such as excellent food hygiene, excellent elongation, excellent processability, and low price, and is used for waterproofing purposes. In the process of disposal, it causes social and environmental problems such as the release of environmental hormones due to plasticizers added to plastics. In addition, the polyethylene-coated container packaging material has a disadvantage of increasing recycling costs because polyethylene, which does not dissociate in water, must undergo a sorting process in the process of dissociating for recycling after use.

It is emerging as a cause of serious environmental pollution, such as the leakage of other environmental hormones in the incineration or landfill of various waste vinyl, styrofoam, plastic containers, etc. that occur in large quantities, and air pollution due to incomplete combustion of highly toxic dioxin detection waste. As environmental problems emerge around the world due to degradable plastics, the development of materials that can minimize natural loads is becoming important, and the emergence of eco-friendly materials that do not cause environmental pollution by returning to the natural circulation system is required.

Among the conventional food packaging paper, paper packaging is manufactured by applying high-temperature heat to the polyethylene chip to dissolve it, and then heat-sealing it on the base paper, and at this time, volatile organic solvents (VOCs) that are estimated to be carcinogens in the melting process of polyethylene chips. Occurs, which causes air pollution. In addition, the recycling process is difficult and treatment costs are high, so most of them are incinerated. Moreover, conventional products have a high risk of releasing environmental hormones in the use/disposal process, which raises problems in terms of food hygiene and safety, and has limitations in terms of environmental destruction and recycling of resources.

By using a water-soluble cellulose technology-based coating solution that can be recycled and has the same effect as polyethylene in the food packaging paper manufacturing process, and through the production of eco-friendly food packaging paper, it is possible to realize pulp regeneration regardless of the type of food paper. Since the high-temperature process is not required, it provides an eco-friendly work environment while reducing process costs and eliminating the generation of volatile organic substances (VOCs) and air pollution at the same time. In addition, since it uses natural substances that do not generate environmental hormones, it is intended to be developed for eco-friendly food packaging that can protect the health of users.

Korean Patent Registration No. 10-1169203

It is harmless to the human body by complementing the shortcomings of existing paper packaging materials (including multi-layered laminated packaging materials) and containers (including plastic products), saving resources (reduction, reusability, recyclability, recyclability, ease of disposal) and eco-friendly incineration Its purpose is to provide an eco-friendly coating solution manufacturing method that has excellent alkali dissociation properties that can protect the environment due to its excellent ease of decomposition during embedding and landfill.

The present invention has been devised to solve the above problems, polytetramehtyleneglycol (PTMG), dimethylol propionic acid (DMPA), N-methylpinolidone (NMP) solution, and isophorone D

Preparing a prepolymer by mixing isocyanate (isophorone diisocyanate, IPDI); Neutralize the prepolymer with triethylamine (TEA) diluted in N-methylpinolidone (NMP) solution, and add distilled water to the neutralized prepolymer to disperse it. EDA) to prepare a water-dispersible polyurethane; Stirring after adding methyl methacrylate (MMA), ferric acetyl carbamate as a biodegradation catalyst, azobisisobutyronitrile (2,2'-azobis isobutyronitrile, AIBN) as a thickener and initiator to the water-dispersible polyurethane To prepare a water-soluble acrylic polyurethane; And dispersing the clay treated with an organic agent in the water-soluble acrylic polyurethane.

The coating solution prepared according to the present invention has excellent oil resistance, water resistance, oxygen barrier property, printability, heat sealing property, is biodegradable in nature when discarded after use, and is an eco-friendly food packaging material that is easy to regenerate (recycle) with alkali dissociation properties. It can be usefully used for paper coatings that are widely used.

1 is a flow chart showing a method of manufacturing the coating solution of the present invention according to an embodiment.
2 is a test report showing alkali dissociation and dispersibility according to the environmental labeling standards of a water-soluble coated paper using a coating solution according to the present invention.

Hereinafter, the present invention will be described in more detail.

A method for preparing a water-soluble paper coating solution according to an embodiment of the present invention,

Prepolymer is prepared by mixing polytetramehtyleneglycol (PTMG), dimethylol propionic acid (DMPA), N-methylpinolidone (NMP) solution, and isophorone diisocyanate (IPDI). step;

Neutralize the prepolymer with triethylamine (TEA) diluted in N-methylpinolidone (NMP) solution, and add distilled water to the neutralized prepolymer to disperse it. EDA) to prepare a water-dispersible polyurethane;

Stirring after adding methyl methacrylate (MMA), ferric acetyl carbamate as a biodegradation catalyst, azobisisobutyronitrile (2,2'-azobis isobutyronitrile, AIBN) as a thickener and initiator to the water-dispersible polyurethane To prepare a water-soluble acrylic polyurethane; And

And dispersing the clay treated with an organic agent in the water-soluble acrylic polyurethane.

The step of preparing the prepolymer may include dissolving 15 to 25 parts by weight of polytetramehtyleneglycol (PTMG) in a vacuum oven at 60 to 80°C with respect to 100 parts by weight of the prepolymer, and then replacing the internal air with nitrogen and stirring;

Stirring by adding 15 to 25 parts by weight of dimethylolpropionic acid based on 100 parts by weight of the prepolymer; And

After stirring by adding 1 to 5 parts by weight of N-methylpinolidone (NMP) solution and 50 to 65 parts by weight of isophorone diisocyanate (IPDI) to 100 parts by weight of the prepolymer, the temperature is lowered to 45 to 55°C. Step; is made, including.

Polytetramehtyleneglycol (PTMG), which is a polyether polyol, may be used in 15 to 25 parts by weight based on 100 parts by weight of water-soluble acrylic polyurethane, and if the amount is less than 15 parts by weight, cohesive strength may be lowered. And, if it exceeds 25 parts by weight, there is a concern that the hydrolysis resistance is deteriorated.

The dimethylol propionic acid (DMPA) may be used in 15 to 25 parts by weight based on 100 parts by weight of water-soluble acrylic polyurethane, and if the amount is less than 15 parts by weight, water dispersion stability may be lowered, and 25 parts by weight If it is exceeded, there is a fear that the hydrolysis resistance may decrease.

The isophorone diisocyanate (IPDI) may be used in an amount of 50 to 65 parts by weight based on 100 parts by weight of water-soluble acrylic polyurethane, and if it is out of the above range, polyurethane may not be sufficiently synthesized or water dispersion stability may be deteriorated. There is.

The step of preparing the water-dispersible polyurethane includes 25 to 45 parts by weight of the prepolymer and 1 to 3 parts by weight of the N-methylpinolidone (NMP) solution based on 100 parts by weight of the water-soluble polyurethane dispersion. TEA) neutralizing the prepolymer by mixing 2 to 6 parts by weight; Stirring while adding 40 to 60 parts by weight of distilled water; And adding 5 to 15 parts by weight of ethylene diamine (EDA) as a chain extender and stirring.

2 to 6 parts by weight of triethylamine (TEA) as the neutralizing agent may be used, and if the amount is less than 2 parts by weight, the water dispersion stability may be deteriorated, and if it exceeds 6 parts by weight, storage stability may be deteriorated. There is a risk of deteriorating physical properties by causing an addition reaction.

Ethylene diamine (EDA) is used as the chain extender, and if the amount is less than 5 parts by weight, the chain extension effect may be insufficient, and if it exceeds 15 parts by weight, storage stability may be deteriorated.

The step of preparing the water-soluble acrylic polyurethane includes 70 to 85 parts by weight of the water-dispersed polyurethane, 10 to 25 parts by weight of methylmetaacrylate (MMA), and 0.1 parts by weight of ferric acetyl carbamate based on 100 parts by weight of the water-soluble acrylic polyurethane. It is characterized by adding and stirring ~2 parts by weight, 0.2 to 1.5 parts by weight of a thickener, and 1 to 3 parts by weight of azobisisobutyronitrile (2,2'-azobis isobutyronitrile, AIBN).

The methylmetaacrylate (MMA) may be used in an amount of 10 to 25 parts by weight based on 100 parts by weight of water-soluble acrylic polyurethane, and if the amount is less than 10 parts by weight, the durability and water resistance improvement effect may be insufficient, and 25 parts by weight. If it exceeds part, there is a risk of deteriorating storage stability.

The ferric acetyl carbamate performs a function of reducing molecular weight and biodegradation of acrylic polyurethane through a photooxidation reaction, and 0.1 to 2 parts by weight may be used, and when used in less than 0.1 parts by weight, the final biodegradation period is prolonged. In addition, if it exceeds 2 parts by weight, the effect is excellent, but there is a disadvantage of increasing the price.

The thickener may be selected from Xanthan gum, carboxy methyl cellulose, guar gum, or starch, and preferably 0.2 to 1.5 parts by weight may be used. If it is used in parts by weight or less, the desired viscosity cannot be reached, and if it exceeds 1.5 parts by weight, the cost increases and the viscosity increases too much.

As an initiator for polymerization, 1 to 3 parts by weight of azobisisobutylonitrile (2,2'-azo-bisiso butyronitrile, AIBN) is used. When the AIBN content is less than 1 part by weight, the efficiency of the initiator is lowered and the reaction does not proceed easily, and when it is used in excess of 3 parts by weight, there is a problem in that a gel is generated due to an instantaneous exothermic reaction.

Dispersing the clay treated with the organic agent in the water-soluble acrylic polyurethane is characterized in that 2 to 5 parts by weight of the clay treated with the organic agent are dispersed in 95 to 98 parts by weight of the water-soluble acrylic polyurethane.

The clay treated with the organic agent is montmorillonite modified with a quaternary ammonium salt, and the quaternary ammonium salt is dimethylbenzyl hydrogenatedtallow quaternary ammonium, dimethyl dihydrogenatedtallow quaternary ammonium. , Methyl tallow bis-2-hydroxyethyl quaternary ammonium, dimethyl hydrogenated tallow 2-ethylhexyl quaternary ammonium, etc. Among them, it is most preferable to perform a modification treatment with dimethyl hydrogenated tallow 2-ethylhexyl quaternary ammonium.

There are many studies on polymer nanocomposites using montmorillonite (PM), a clay mineral of a layered structure. Nanocomposite materials containing montmorillonite known as nanoclays are known as inorganic additives that can provide various advantages such as not only enhancing mechanical properties, but also excellent heat resistance, low gas permeability, and imparting flame retardancy. When this nanoclay is made of a composite material, it improves the physical properties of the polymer/nanoclay composite when it is uniformly dispersed in a nano-size in a polymer matrix. Since nanoclay has strong hydrophilicity, it is often difficult to disperse when added to a polymer, so the surface of the clay is modified with an organic agent and then mixed and added.

According to another embodiment of the present invention,

Forming a coating layer by applying a coating solution prepared by the method of any one of claims 1 to 8 on an upper surface of a substrate made of coated or uncoated paper or kraft paper ^{by applying 4 to 5 g/m 2;}

Including the step of drying the coating layer with an ultraviolet drying device consisting of an ultraviolet lamp, a hot air device, and a cooling and cooling device,

The hot air is sprayed at a temperature of 50 to 200°C in the hot air device for 1 to 5 minutes, and the coating layer is rapidly cooled at a temperature of -10 to 10°C for 1 to 3 minutes while cooling wind is sprayed from the cooling and cooling device. It provides a method of manufacturing a food wrapper.

The coated paper that can be used as the substrate may be used by selecting any one of art paper, SC manila paper, ivory manila paper, royal ivory manila paper, and CCP (cast coated paper) paper. In addition, the uncoated paper that can be used as the substrate may be used by selecting any one of white paper, thin-leaf paper, and TOP Manila paper.

The ultraviolet drying device is a device to which sterilization and sterilization treatment, constant temperature, and humidity are applied, and by irradiating the food wrapper with ultraviolet rays and internally curing by ultraviolet rays, the coating layer is completely dried. In addition, the hardness of the coating layer is improved by changing the physical properties of the coating layer through the internal curing action.

In addition, it is preferable to spray hot air for 1 to 5 minutes at a temperature of 50 to 200°C in the hot air device. When the temperature and time of the hot air are less than 50°C and 1 minute, there is a problem in that the inside of the coating layer is not dried, and when the temperature and time are more than 200°C and 5 minutes, there is a problem that a part of the coated food wrapper is stained.

In addition, while cooling wind is sprayed from the cooling and cooling device, the coating layer is rapidly cooled at a temperature of -10 to 10°C for 1 to 3 minutes to prevent curling of the food wrapper. If the cooling temperature and time are less than -10°C and 1 minute, there is a problem that the coated food wrapper sticks to the roller provided in the UV drying device, and if it exceeds 10°C and 3 minutes, a part of the coated food wrapper is folded. There is a problem of losing

The coating solution is characterized in that coating is performed by selecting any one of knife coating, reverse roll coating, air knife coating, and wire rod coating.

In the knifeing coating method, the coating thickness and amount of the coating material can be adjusted by a knife or blade, and can be adjusted according to the number of meshes of the transfer roll. The quality of the coating depends on the angle and shape of the knife, the web passing speed, and the flow characteristics of the coating liquid.

In the reverse roll coating method, when the coating resin is applied to the web by the coating roll and then passes through the metering roll and the rubber backing roll, the excess coating liquid is removed and the surface is treated smoothly, so that the total thickness of the coated film is uniform. Is regulated.

The surface of the backing roll is a material with elasticity such as rubber, and the coating thickness can be adjusted by adjusting the pressure of the nip. The higher the nip pressure and the faster the rotational speed of the roll, the greater the amount of coating agent removed. It is applied in consideration of variables such as the thickness of the coating, the viscosity of the coating liquid, the amount of solids, thixotropy, and tack. .

The air knife coating method is a method of removing excess coating liquid by colliding laminar flow air against the paper surface.When the paper surface contacts a coating roll rotating on a pan with a coating material, a predetermined amount of coating thickness is obtained. Is applied. At this time, the amount of coating resin to be applied depends on the collision speed and collision angle of the air, the viscosity of the coating liquid, and the moving speed of the paper. The advantage of this method is that it uses air pressure without a coating knife, so it is uniformly coated regardless of the irregularities on the paper surface, and excellent coating effect occurs even if the thickness of the coating is thin.

4~5g/m ² of the coating solution is applied to form a coating layer, which guarantees production speed only when a small amount is coated, and a water-soluble solution is coated on paper. Phenomenon).

The coating layer may be made of 1 to 3 degrees, preferably forming a 3 degree, enhances the physical properties of the food wrapper. If coating 12~15g/m ² of coating solution at 1 degree at a time, the water resistance, oil resistance, barrier property and heat sealing properties required after coating will be inferior to that of continuous 3 degree coating.

Hereinafter, the present invention will be described in more detail through examples and experimental examples. However, these examples are only for helping the understanding of the present invention, and the scope of the present invention is not limited to these examples in any sense.

Preparation of reagents

To prepare a water-soluble water-dispersible polyurethane, polytetramehtyleneglycol (PTMG) (Mw=1,800 g/mole), an ether-type polyol, was vacuum-dried at 1mmHg and 60°C for about 10 hours or more to remove moisture. . In order to introduce a hydrophilic functional group in the urethane, dimethylol propionic acid (DMPA) was used as it was without further stasis. Triethylamine (TEA) was used as the neutralizing agent, and ethylenediamine (EDA) was used as the chain extender.

The acrylic monomer used in the manufacture of the acrylic-polyurethane hybrid was methyl metaacrylate (MMA), ferric acetyl carbamate was used as the biodegradation catalyst, xanthan gum as the thickener, and azobisiso as the initiator. Butyronitrile (2,2'-azobis isobutyronitrile, AIBN) was used. As other solvent, n-methyl-2-pyrrolidinone (NMP) was used.

Clay is Southern Clay Product's montmorillonite, pure montmorillonite (PM) with a cation exchange capacity (CEC) of 92.6 meq/100g, Cloisite 30B (CEC: 90.0 meq/100g) and Cloisite 25A ( CEC: 95.0 meq/100g) was used. 30B and 25A are clays modified with quaternary ammonium of methyl tallow bis-2-hydroxyethyl and quaternary ammonium of dimethyl dehydrogenated tallow 2-ethylhexyl, respectively.

<Example 1> Preparation of water-soluble acrylic urethane hybrid dispersion

First, Waterborne Polyurethane Dispersions (WPUDs) were synthesized. This is produced in a'two shot process' method in which PTMG and DMPA are first reacted with prepolymer in the mixing process, and isocyanate is then added. The two inlets of the stirrer are purged with nitrogen, and the other inlet is blocked and distilled water is added dropwise while proceeding.

1) Preparation of NCO-prepolymer

First, put PTMG in a stirrer, melt it in a vacuum oven (100°C), and install it in an oil bath. The impeller speed of the stirrer is fixed at 100 rpm and the air inside the stirrer is replaced with nitrogen for 30 minutes to start the reaction. Then, DMPA dried in a vacuum in advance is put into a stirrer without changing the reaction conditions and dissolved in PTMG.

After stirring for about 1 hour, NMP and IPDI are added. After stirring for an additional hour as it is, the temperature is lowered to 50° C., and then stirred for an additional hour to obtain an NCO-prepolymer.

[Table 1]

2) Preparation of water-soluble polyurethane dispersion

A neutralizing agent TEA diluted with an NMP solution is added to the prepared NCO-prepolymer and neutralized. Then, a certain amount of distilled water is added dropwise at a constant speed, and the stirring speed is increased to 300 rpm. Thereafter, EDA is put in a stirrer and stirring is carried out for a total of 3 hours in that state to finally obtain a water-soluble polyurethane dispersion.

[Table 2]

3) Preparation of acrylic-urethane hybrid dispersion

A water-soluble polyurethane dispersion prepared in the above manner is prepared. After stabilizing the MMA and the water-soluble polyurethane dispersion at a high speed of 1500 rpm for about 30 minutes, the impeller speed of the stirrer was installed in an oil bath and replaced with nitrogen for 30 minutes. When the inside of the stirrer is under nitrogen, a solution in which AIBN is dissolved in MMA is added and stirred at 300 rpm for about 1 hour to prepare a liquid waterborne acrylic-urethane hybrid dispersion (WAUDs).

[Table 3]

<Example 2> Preparation of nano-clay dispersion water-soluble acrylic polyurethane coating solution

In the liquid aqueous acrylic-urethane hybrid dispersion solution prepared in Example 1, 2.0 to 5.0 parts by weight of montmorillonite (Cloisite 30B or Cloisite 25A) whose surface has been modified with an organic agent relative to the total weight was added to the total weight, and ferric acetyl was used as a biodegradation catalyst. 0.3 parts by weight of carbamate and 1.0 part by weight of xanthan gum as a thickener were further added, followed by stirring at 50° C., and dispersing the nano-clay treated with an organic agent to prepare a water-soluble paper coating solution.

As a result of examining the interlayer spacing of the nanoclay, the interlayer distance of the nanoclay of Cloisite 25A increases, so that it is effectively dispersed in the resin, and the measurement result of the thermal properties of the acrylic resin/nanoclay composite material also shows that the glass transition temperature of the NAD resin including Cloisite 25A is increased. It was the highest, and the storage modulus was also observed to be superior to Cloisite 25A, so adding Cloisite 25A with nanoclay is the most effective.

<Comparative Example 1> 1 degree coating

After putting the substrate into the dry laminating coating machine, and coating the coating solution prepared in Example 2 on the upper surface of the substrate at a coating amount of 12 g/m2 to form a coating layer, the substrate was dried in an ultraviolet drying device, but irradiated with ultraviolet rays while hot air. The apparatus was dried by spraying hot air at 100° C. for 3 minutes, and then rapid cooling was performed at 5° C. and 3 minutes in a cooling and cooling apparatus, followed by drying.

<Comparative Example 2> 2nd degree coating

A base material was introduced into a dry laminating coating machine, and the coating solution prepared in Example 2 was coated on the top surface of the base material at a coating amount of 6 g/m 2 to form a first coating layer, and then 6 g/m 2 of the coating solution was applied to the top surface of the first coating layer. A second coating layer was formed by coating with the coating amount of. Then, dry the substrate on which the first coating layer and the second coating layer are formed in an ultraviolet drying device, and dry by spraying hot air for 100° C. and 3 minutes in a hot air device while irradiating with ultraviolet light, and then 5° C. and It was dried by rapid cooling for 3 minutes.

<Comparative Example 3> 3rd degree coating

A substrate was introduced into a dry laminating coating machine, and the coating solution prepared in Example 2 was coated on the upper surface of the substrate at a coating amount of 4 g/m 2 to form a first coating layer, and then 4 g/m 2 of the coating solution was applied to the upper surface of the first coating layer. After forming a second coating layer by coating with a coating amount of, a third coating layer was formed by coating the coating solution on the upper surface of the second coating layer at a coating amount of 4 g/m 2. Then, dry the substrate on which the first coating layer, the second coating layer, and the third coating layer are formed in an ultraviolet drying device, and dry by spraying hot air at 100° C. and for 3 minutes in a hot air device while irradiating with ultraviolet rays, and then cooling and cooling device It was dried by rapid cooling at 5° C. and 3 minutes.

<Experimental Example 1>

Comparative Examples 1 to 3 were tested for physical properties under the same conditions, and the results are summarized in [Table 4].

[Table 4]

<Test method>

Surface roughness (smoothness): KSM ISO 5627:2011

Induction resistance: KS M 7124:2008

Domestic water supply: KS M 7025: 2012:12

Speculative prayer: KS M 7020: 2006:11

Water vapor transmission rate (gravity method): KS M ISO 2528

Adhesion (heat sealing) strength: self-test

The surface roughness of the coated paper produced by the present invention was tested by the method of KSM ISO 5627:2011, oil resistance was tested by the method of KS M 7124:2008, and water resistance was tested by the method of KS M 7025:2012:12, The air permeability was tested by the method of KS M 7020:2006:11, the moisture permeability was tested by the method of KS M ISO 2528, and the thermal bonding (heat sealing) strength was tested through a self-test. Through the above test, it was found that the coated paper prepared in Comparative Example 3 was superior in physical properties compared to the case where the coated paper prepared in Comparative Examples 1 and 2 was coated.

In addition, the eco-friendliness of the coated paper prepared according to the present invention did not contain impurities and did not show adhesiveness in the alkali dissociation and dispersibility test of the product subject to environmental labeling of the Ministry of Environment of Korea and the certification standard EL 606. Therefore, a level of reusability has been achieved.

In addition, the coated paper manufactured according to the present invention can be safely used as a food packaging paper in accordance with the test standards of the processing equipment of the standards and standards for the Ministry of Food Safety and Security's food code mechanism and container packaging.

<Experimental Example 2>

In order to check whether the water-soluble coated papers prepared according to Comparative Examples 1 to 3 contain heavy metals and harmful substances, a test was conducted according to the "Standard Standards for Appliances and Containers", and the results are shown in [Table 5].

[Table 5]

Test standard: [Ministry of Food and Drug Safety] Standards for packaging equipment and containers for food

From the results of [Table 5], it can be seen that it meets the standard standards for packaging equipment and containers, is harmless to the human body, and the content of heavy metals is suitable.

As described above, what has been described in the present invention is merely an example for an eco-friendly water-soluble coated paper and a method of manufacturing the same using a multi-layer coating technology having oil resistance, water resistance, moisture resistance and heat sealing property, and the present invention is not limited to the above embodiment, but is not limited to each other. It can be implemented in various other forms, only this embodiment is provided to complete the disclosure of the present invention, and to completely inform the scope of the invention to those of ordinary skill in the technical field to which the present invention belongs, The invention is only defined by the scope of the claims.

Claims (8)

Prepolymer is prepared by mixing polytetramehtyleneglycol (PTMG), dimethylol propionic acid (DMPA), N-methylpinolidone (NMP) solution, and isophorone diisocyanate (IPDI). step;
Neutralize the prepolymer with triethylamine (TEA) diluted in N-methylpinolidone (NMP) solution, and add distilled water to the neutralized prepolymer to disperse it. EDA) to prepare a water-dispersible polyurethane;
Addition of methyl methacrylate (MMA), biodegradation catalyst ferric acetyl carbamate, thickener xanthan gum, and initiator azobisisobutyronitrile (2,2'-azobis isobutyronitrile, AIBN) to the water-dispersible polyurethane And then agitating to prepare a water-soluble acrylic polyurethane; And
Dispersing the clay treated with an organic agent in the water-soluble acrylic polyurethane; nano-clay dispersion water-soluble acrylic polyurethane coating solution manufacturing method comprising a.
The method of claim 1,
The step of preparing the prepolymer is
Dissolving 15 to 25 parts by weight of polytetramehtyleneglycol (PTMG) based on 100 parts by weight of the prepolymer at 60 to 80° C. in a vacuum oven, and then replacing the internal air with nitrogen and stirring;
Stirring by adding 15 to 25 parts by weight of dimethylolpropionic acid based on 100 parts by weight of the prepolymer; And
After stirring by adding 1 to 5 parts by weight of N-methylpinolidone (NMP) solution and 50 to 65 parts by weight of isophorone diisocyanate (IPDI) to 100 parts by weight of the prepolymer, the temperature is lowered to 45 to 55°C. Step; Method for producing a water-soluble acrylic polyurethane coating solution comprising a nano-clay dispersion.
The method of claim 1,
The step of preparing the water-dispersible polyurethane includes 25 to 45 parts by weight of the prepolymer and 1 to 3 parts by weight of the N-methylpinolidone (NMP) solution based on 100 parts by weight of the water-dispersion polyurethane dispersion. , TEA) neutralizing the prepolymer by mixing 2 to 6 parts by weight;
Stirring while adding 40 to 60 parts by weight of distilled water dropwise; And
A method for preparing a water-soluble acrylic polyurethane coating solution with nano-clay dispersion, comprising the step of adding and stirring 5 to 15 parts by weight of ethylene diamine (EDA) as a chain extender.
The method of claim 1,
The step of preparing the water-soluble acrylic polyurethane
Based on 100 parts by weight of water-soluble acrylic polyurethane, 70 to 85 parts by weight of the water-dispersed polyurethane, 10 to 25 parts by weight of methyl methacrylate (MMA), 0.1 to 2 parts by weight of ferric acetyl carbamate, 0.2 to 1.5 parts by weight of xanthan gum And azobisisobutyronitrile (2,2'-azobis isobutyronitrile, AIBN) 1 to 3 parts by weight and stirring.
The method of claim 1,
Dispersing the clay treated with an organic agent in the water-soluble acrylic polyurethane
Nano-clay dispersion water-soluble acrylic polyurethane coating solution, characterized in that dispersing 2 to 5% of clay treated with an organic agent in 95 to 98 wt% of water-soluble acrylic polyurethane.
The method of claim 1,
Clay treated with the organic agent is montmorillonite modified with a quaternary ammonium salt,
The quaternary ammonium salt is methyl tallow bis-2-hydroxyethyl quaternary ammonium or dimethyl hydrogenated
A method for preparing a water-soluble acrylic polyurethane coating solution with nano-clay dispersion, characterized in that it is dimethyl hydrogenatedtallow 2-ethylhexyl quaternary ammonium.
A coated paper or any one of claims 1 to 6 prepared by the method of any one of wherein the coating liquid on the upper surface of the non-substrate of Jiro known or kraft to form a 4 ~ 5g / m ² is applied to the coating layer;
Including the step of drying the coating layer with an ultraviolet drying device consisting of an ultraviolet lamp, a hot air device, and a cooling and cooling device,
The hot air is sprayed at a temperature of 50 to 200°C in the hot air device for 1 to 5 minutes, and the coating layer is rapidly cooled at a temperature of -10 to 10°C for 1 to 3 minutes while cooling wind is sprayed from the cooling and cooling device. How to make a food wrapper.
The method of claim 7,
The coating layer is a food wrapping paper manufacturing method, characterized in that consisting of 1 to 3 layers.

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