KR102469425B1 - Method of manufacturing water soluble film and water soluble film thereby - Google Patents

Abstract

The present invention provides a method for manufacturing a water dissociable film that is environmentally friendly and has excellent water dissociability and durability, and a water dissociable film.

Description

Manufacturing method of water dissociable film and water dissociable film {METHOD OF MANUFACTURING WATER SOLUBLE FILM AND WATER SOLUBLE FILM THEREBY}

The present invention relates to a method for preparing a water dissociable film and a water dissociable film. Specifically, it relates to a method for preparing a water-dissociable film having excellent water-dissociable property and a water-dissociable film.

Oil-based polymer-based plastics are inexpensive and easy to process. It has characteristics such as excellent physical properties and light weight, and is used for various purposes ranging from disposable products to industrial parts materials. As the consumption of plastics that bring convenience in life increases year by year, the amount of waste plastics is also rapidly increasing. Plastic is a non-degradable material that cannot be reduced to nature, and it is very important to increase the recycling rate of waste plastic because it causes serious environmental pollution in the process of incineration or landfill.

In general, disposable PET bottles used for packaging containers such as bottled water and beverages are recyclable materials. However, as adhesive labels that do not come off easily or are colored in the process of being packaged as products are often discharged without separating labels and PET bottles after use, the recycling rate is low and the cost of separating and removing labels is high. There is a problem. Therefore, various efforts are being made to develop eco-labels that are easily separated from PET bottles, such as water-separable adhesive labels or non-adhesive labels to increase the recycling rate of PET bottles.

Water-separable adhesive labels use adhesives that are easily soluble in water when attaching labels to the surface of PET bottles, and can be easily separated by washing with water during the PET bottle recycling process. However, it is cumbersome for the user to remove them one by one, and separate label processing costs are required. In addition, if the label is discharged without being removed, there is a problem in that the cost of removing it from the recycling company is incurred.

Cellulose, a natural biomass, is an eco-friendly resource abundant in nature, and nanofibrillated cellulose converted into nano-sized through chemical or mechanical processes is attracting attention as a new material. Since it has a large specific surface area and a high hydroxyl content, high-strength films and sheets can be produced by hard hydrogen bonding during film and sheet production. However, since the manufactured nanofibrillated cellulose has difficulty in water dissociation due to a strong hydrogen bond, there is a problem in that it cannot be recycled.

A technical problem to be achieved by the present invention is to provide a method for manufacturing a water-dissociable film that is environmentally friendly and has excellent water-dissociable property, and a water-dissociable film.

However, the problem to be solved by the present invention is not limited to the above-mentioned problem, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to one aspect of the present invention, preparing a lignocellulosic cellulose fiber suspension and seaweed pulp suspension; preparing a raw material mixture by mixing the lignocellulosic cellulose fiber suspension and the seaweed pulp suspension; Desolvating and drying the raw material mixture, wherein the raw material mixture includes 20 parts by weight to 500 parts by weight of the seaweed pulp based on 100 parts by weight of the lignocellulosic cellulose fibers. is provided.

According to one aspect of the present invention, a water dissociable film prepared by the above method and having a thickness of 10 μm to 500 μm is provided.

The method for manufacturing a water dissociable film according to an exemplary embodiment of the present invention can provide a water dissociable film that is environmentally friendly and has excellent water dissociability.

The water dissociable film according to an exemplary embodiment of the present invention can be used as a label material attached to a disposable PET bottle, and can be easily removed by washing with water even without removing the label after the disposable PET bottle is used, thereby increasing environmental protection efficiency. can improve

The water dissociable film according to an exemplary embodiment of the present invention has excellent durability and can be firmly attached to a disposable PET bottle as a label until use is completed.

Since the water-dissociable film according to an exemplary embodiment of the present invention uses biodegradable raw materials, it can be discarded without separate treatment, and thus has excellent economic feasibility and eco-friendliness.

Effects of the present invention are not limited to the above-mentioned effects, and effects not mentioned will be clearly understood by those skilled in the art from the present specification and accompanying drawings.

1 is a photograph of water dissociable films prepared in Examples 1 to 3 and Comparative Examples 1 to 2 after 30 seconds of water dissociability evaluation.

Throughout the present specification, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

Throughout the present specification, when a member is said to be located “on” another member, this includes not only a case where a member is in contact with another member, but also a case where another member exists between the two members.

Throughout the present specification, the unit "parts by weight" may mean the ratio of the weight of each component.

Throughout this specification, “size” may refer to fiber length with respect to fiber type.

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

According to an exemplary embodiment of the present invention, preparing a lignocellulosic cellulose fiber suspension and seaweed pulp suspension; preparing a raw material mixture by mixing the lignocellulosic cellulose fiber suspension and the seaweed pulp suspension; Desolvating and drying the raw material mixture, wherein the raw material mixture includes 20 parts by weight to 500 parts by weight of the seaweed pulp based on 100 parts by weight of the lignocellulosic cellulose fibers. is provided.

The method for manufacturing a water dissociable film according to an exemplary embodiment of the present invention can provide a water dissociable film that is environmentally friendly and has excellent water dissociability.

Hereinafter, the manufacturing method of the water dissociable film will be described in detail for each step.

According to one embodiment of the present invention, first, a lignocellulosic cellulose fiber suspension and a seaweed pulp suspension are prepared. The lignocellulosic fiber suspension may be prepared by a process comprising the steps of preparing lignocellulosic cellulose fibers and mixing the lignocellulosic fibers with a solvent, and the seaweed pulp suspension comprises the steps of preparing seaweed pulp and seaweed pulp It can be manufactured by a process comprising the step of mixing with a solvent.

According to an exemplary embodiment of the present invention, the seaweed pulp may be manufactured by a method known in the art, and for example, it may be produced by a method comprising pre-treating the seaweed raw material with an acidic solution and bleaching it with hydrogen peroxide. can

According to one embodiment of the present invention, the prepared seaweed pulp may be washed. Specifically, impurities contained in the seaweed pulp may be removed using distilled water.

According to an exemplary embodiment of the present invention, the seaweed raw material is not particularly limited, but may include brown algae, and specifically, capsular seaweed, kelp seaweed, crake seaweed, skein lash seaweed, and star fluff. It may include one or more of seaweeds, mountain algae, reticulum order seaweeds, Discosporangium order seaweeds, downy order seaweeds, and suborder seaweeds. Preferably, the seaweed raw material may include capsular seaweeds, for example, may include capsicum capsicum.

According to one embodiment of the present invention, the seaweed pulp may have a fiber length of 0.1 nm to 40 mm, 100 nm to 10 mm, or 10 μm to 500 μm, and a fiber width of 0.1 nm to 300 μm, 10 nm to 150 μm. , It may be from 10 μm to 100 μm. When seaweed pulp having a fiber length and fiber width within the above ranges is used, the water dissociable film may have excellent water decomposability.

According to one embodiment of the present invention, a suspension may be prepared by mixing the prepared seaweed pulp with a solvent. Distilled water, water, acetone, ethanol, methanol and the like can be used as the solvent.

According to an exemplary embodiment of the present invention, based on 100 parts by weight of the seaweed pulp suspension, the content of the seaweed pulp may be 0.01 parts by weight to 5 parts by weight.

Specifically, the amount of the seaweed pulp included in the seaweed pulp suspension is 0.01 part by weight to 5 parts by weight, 0.01 part by weight to 3 parts by weight, 0.05 part by weight to 3 parts by weight, based on 100 parts by weight of the seaweed pulp suspension. It may be 0.05 parts by weight to 2 parts by weight, 0.01 parts by weight to 1 part by weight, 0.05 parts by weight to 0.5 parts by weight, or 0.05 parts by weight to 0.3 parts by weight. By controlling the content of the seaweed pulp included in the seaweed pulp suspension within the above range, the water dissociable film can be effectively manufactured.

According to an exemplary embodiment of the present invention, the lignocellulosic cellulose fibers are prepared using a lignocellulosic biomass raw material to prepare pulp; preparing the lignocellulosic cellulose fibers comprising at least one of lignocellulosic cellulose microfibers and lignocellulosic cellulose fibrils from the lignocellulosic biomass pulp;

According to an exemplary embodiment of the present invention, the preparing of the woody biomass pulp may include reacting the woody biomass raw material with a mixed solvent of a glycol ether solvent and an acid.

According to an exemplary embodiment of the present invention, the wood-based biomass pulp may be manufactured by a process including reacting a wood-based biomass raw material with a mixed solvent of a glycol ether-based solvent and an acid. That is, organic solvent pulp can be produced using the wood-based biomass raw material. Specifically, pulp may be formed by reacting a wood-based biomass raw material with a mixed solvent of a glycol ether-based solvent and an acid. When pulp is formed by reacting a wood-based biomass raw material with a mixed solvent of a glycol ether-based solvent and an acid, physical properties such as durability of a water dissociable film can be effectively improved.

According to an exemplary embodiment of the present invention, the woody biomass raw material may include at least one of softwood wood chips and hardwood wood chips, but the type of the woody biomass raw material is not limited. By using the above-described lignocellulosic biomass raw material, the water dissociable film having high biodegradability and being an eco-friendly material can be manufactured.

According to an exemplary embodiment of the present invention, the mixed solvent may be a mixture of a glycol ether-based solvent and an acid. The glycol ether-based solvent is ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, propylene glycol methyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, and dipropylene glycol methyl ether. However, the type of the glycol ether-based solvent is not limited. In addition, hydrochloric acid, sulfuric acid, nitric acid, etc. may be used as the acid, but the type of acid is not limited.

According to an exemplary embodiment of the present invention, the volume ratio of the glycol ether-based solvent and the acid in the mixed solvent may be 95:5 to 99:1. Specifically, the volume ratio of the glycol ether-based solvent and the acid included in the mixed solvent may be 96:4 to 98.5:1.5, 96.5:3.5 to 98:2, or 97:3 to 97.5:2.5. When the volume ratio of the glycol ether-based solvent and the acid contained in the mixed solvent is within the above range, pulp can be effectively produced from the lignocellulosic biomass raw material.

According to an exemplary embodiment of the present invention, pulp may be prepared by reacting the mixed solvent at a mixing ratio of 1 L to 3 L with respect to 1 Kg of the lignocellulosic biomass raw material. Specifically, the mixing ratio of the mixed solvent to 1 Kg of the lignocellulosic biomass raw material may be 1.5L to 2.5L, or 2L. By adjusting the mixing ratio of the wood-based biomass raw material and the mixed solvent within the above-described range, the yield of the produced pulp may be improved.

According to one embodiment of the present invention, the step of forming the wood-based biomass pulp may be performed at a temperature of 100 °C to 150 °C. Specifically, the temperature in the step of forming the wood-based biomass pulp may be 110 °C to 140 °C, or 120 °C to 130 °C. The woody biomass pulp may be stably formed from the woody biomass raw material by adjusting the temperature at which the step of forming the woody biomass pulp is performed within the above range.

In addition, the forming of the wood-based biomass pulp may be performed for 60 minutes to 180 minutes, 90 minutes to 160 minutes, or 120 minutes to 150 minutes. When the time for performing the step of forming the woody biomass pulp is within the above range, the woody biomass pulp can be stably formed and the yield of the woody biomass pulp can be improved.

According to one embodiment of the present invention, the prepared wood-based biomass pulp may be washed. Specifically, impurities contained in the wood-based biomass pulp may be removed using distilled water.

According to an exemplary embodiment of the present invention, the preparing of the lignocellulosic cellulose fibers may include preparing a lignocellulosic biomass pulp slurry by mixing the lignocellulosic biomass pulp with a basic solution; and introducing the lignocellulosic biomass pulp slurry into a mixer and kneading to prepare the lignocellulosic cellulose microfibers.

According to an exemplary embodiment of the present invention, the basic solution may include a sodium hydroxide solution, a potassium hydroxide solution, and a lithium hydroxide solution, but the type of the basic solution is not limited.

According to one embodiment of the present invention, the concentration of the basic solution included in the wood-based biomass pulp slurry may be 0.1 N to 1 N. Specifically, the concentration of the basic solution may be 0.15 N to 0.8 N, 0.2 N to 0.6 N, or 0.25 N to 0.5 N. When the concentration of the basic solution is within the above range, lignocellulosic cellulose microfibers may be effectively formed from the lignocellulosic biomass pulp slurry.

According to an exemplary embodiment of the present invention, the pH of the lignocellulosic biomass pulp slurry may be 8 to 14. Specifically, the pH of the wood-based biomass pulp slurry may be 9 to 13 or 10 to 12. By adjusting the pH of the lignocellulosic biomass pulp slurry within the aforementioned range, lignocellulosic cellulose microfibers may be effectively formed from the lignocellulosic biomass pulp slurry. In addition, when the pH of the lignocellulosic biomass pulp slurry is within the above-described range, the swelling of the fibers included in the lignocellulosic biomass pulp slurry is promoted, thereby producing microfibres of lignocellulosic cellulose microfibers through a kneading process described later. can be produced effectively.

According to an exemplary embodiment of the present invention, the content of the wood-based biomass pulp may be 3 parts by weight to 15 parts by weight with respect to 100 parts by weight of the wood-based biomass pulp slurry. Specifically, with respect to 100 parts by weight of the lignocellulosic biomass pulp slurry, the content of the lignocellulosic biomass pulp is 4.5 parts by weight to 12.5 parts by weight, 5 parts by weight to 10 parts by weight, 3 parts by weight to 10 parts by weight, or 7.5 parts by weight to 15 parts by weight. For example, the content of the lignocellulosic biomass pulp included in the lignocellulosic biomass pulp slurry may be 3 wt% to 15 wt%.

By adjusting the content of the lignocellulosic biomass pulp included in the lignocellulosic biomass pulp slurry to the above-described range, friction and dispersion between fibers are efficiently performed during the kneading process using a mixer, thereby miniaturizing lignocellulosic cellulose micro Fibers can be easily produced. On the other hand, if the content of the lignocellulosic biomass pulp contained in the lignocellulosic biomass pulp slurry is too small, the efficiency of friction between fibers is reduced, making it impossible to easily manufacture miniaturized lignocellulosic cellulose microfibers. In addition, when the content of the lignocellulosic biomass pulp contained in the lignocellulosic biomass pulp slurry is too large, the lignocellulosic biomass pulp slurry has a high viscosity and is not smoothly kneaded.

According to one embodiment of the present invention, the kneading may be performed at a rotational speed of 100 rpm to 600 rpm. Specifically, the rotation speed at which the kneading step is performed may be 150 rpm to 550 rpm, 200 rpm to 500 rpm, 250 rpm to 450 rpm, or 300 rpm to 400 rpm. By adjusting the rotational speed at which the kneading step is performed within the above range, the manufactured lignocellulosic cellulose microfibers can be formed more stably. The rotational speed may mean the rotational speed of a mixer used in the kneading step.

According to an exemplary embodiment of the present invention, the kneading may be performed at a temperature of 20 °C to 35 °C. By adjusting the temperature in the kneading step within the above range, it is possible to suppress deformation and damage of the prepared wood-based cellulose microfibers.

According to an exemplary embodiment of the present invention, the manufacturing method of the lignocellulosic microfibers may control physical properties of the lignocellulosic microfibers by adjusting the kneading time. Specifically, the kneading may be performed for 1 hour to 3 hours. Through this, it is possible to effectively improve physical properties such as durability of the manufactured water dissociable film.

According to an exemplary embodiment of the present invention, the mixer into which the woody biomass pulp slurry is introduced is a kneader, and may be a Hobart mixer, a spiral mixer, or a vertical mixer. However, the type of mixer is not limited, and a known device capable of applying shear force to the wood-based biomass pulp slurry may be used.

According to an exemplary embodiment of the present invention, the preparing of the lignocellulosic cellulose fibers may include preparing the lignocellulosic cellulose fibrils by homogenizing the lignocellulosic biomass pulp. Specifically, lignocellulosic cellulose fibrils may be prepared by homogenizing the aforementioned organic solvent pulp. Through this, lignocellulosic cellulose nanofibrils (CNF) or lignocellulosic microfibrillated cellulose (MFC) can be prepared. In order to homogenize the wood-based biomass pulp, a high-pressure homogenizer or a high-pressure emulsifier used in the art may be used. For example, when the wood-based biomass pulp is homogenized using a high-pressure homogenizer, the number of times the wood-based biomass pulp is passed through the high-pressure homogenizer, the operating pressure of the high-pressure homogenizer, etc. are adjusted. The size and shape of the cellulose fibrils can be controlled.

According to an exemplary embodiment of the present invention, the lignocellulosic cellulose fiber may have a lignin content of 0.1% to 30% by weight. That is, the lignin content of the lignocellulosic cellulose microfibers prepared from the lignocellulosic biomass pulp may be 0.1% to 30% by weight, and the lignin content of the lignocellulosic cellulose fibrils prepared from the lignocellulosic biomass pulp It may be 0.1% to 30% by weight.

Specifically, the lignin content of the prepared lignocellulosic cellulose fibers (liginous cellulose microfibers or lignocellulosic cellulose fibrils) is 0.1% to 30% by weight, 1% to 28% by weight, 5% to 25% by weight , 10 wt % to 22.5 wt %, or 15 wt % to 20 wt %. Meanwhile, by removing lignin from the prepared lignocellulosic fibers by bleaching, lignocellulosic fibers having a lignin content of 0% by weight may be formed.

When the lignin content of the lignocellulosic cellulose fiber is within the above range, lignin is a hydrophobic material and cellulose is a hydrophilic material, so the higher the lignin content, the more hydrophobic it can be. In addition, the lower the lignin content of lignocellulosic cellulose fibers, the higher the whiteness of the film.

According to an exemplary embodiment of the present invention, the lignocellulosic cellulose fibers may have a fiber length of 0.1 nm to 40 mm, 100 nm to 10 mm, or 10 μm to 500 μm, and a fiber width of 0.1 nm to 300 μm, 10 nm to 500 μm. It may be 150 μm, 10 μm to 100 μm. In the case of using wood-based cellulose fibers having a fiber length and fiber width within the above ranges, the durability of the water dissociable film may be excellent.

According to one embodiment of the present invention, a suspension may be prepared by mixing the prepared lignocellulosic fibers with a solvent. Distilled water, water, acetone, ethanol, methanol and the like can be used as the solvent.

According to one embodiment of the present invention, based on 100 parts by weight of the lignocellulosic fiber suspension, the content of the lignocellulosic cellulose fibers may be 0.01 part by weight to 5 parts by weight.

Specifically, the content of the lignocellulosic fibers included in the lignocellulosic fiber suspension is 0.01 to 5 parts by weight, 0.01 to 3 parts by weight, 0.05 parts by weight based on 100 parts by weight of the lignocellulosic fiber suspension. part by weight to 3 parts by weight, 0.05 parts by weight to 2 parts by weight, 0.01 parts by weight to 1 part by weight, 0.05 parts by weight to 0.5 parts by weight, or 0.05 parts by weight to 0.3 parts by weight. By adjusting the content of the lignocellulosic fibers included in the lignocellulosic fiber suspension within the above range, the water dissociable film can be effectively prepared.

According to one embodiment of the present invention, a raw material mixture is prepared by mixing the seaweed pulp suspension prepared as above and the lignocellulosic cellulose fiber suspension.

The mixing may be performed by a method used in the art, and is not particularly limited.

According to one embodiment of the present invention, the raw material mixture may include lignocellulosic cellulose fibers, seaweed pulp, and a solvent. These components can be included by mixing the suspension.

According to one embodiment of the present invention, the total content of the lignocellulosic cellulose fibers and the seaweed pulp included in the raw material mixture is 1 to 5 parts by weight, 1 to 3 parts by weight based on 100 parts by weight of the raw material mixture part, 1.5 parts by weight to 3 parts by weight, 1.5 parts by weight to 5 parts by weight, 1.5 parts by weight to 2.5 parts by weight, 1 part by weight to 2.5 parts by weight, or 1.5 parts by weight to 2 parts by weight.

According to an exemplary embodiment of the present invention, the raw material mixture may include 20 parts by weight to 500 parts by weight of the seaweed pulp based on 100 parts by weight of the lignocellulosic cellulose fibers. That is, the seaweed pulp suspension and the lignocellulosic fiber suspension may be mixed so that the seaweed pulp included in the raw material mixture is included in an amount of 20 to 500 parts by weight based on 100 parts by weight of the lignocellulosic fibers.

Specifically, the raw material mixture includes 20 parts by weight to 500 parts by weight, 30 parts by weight to 400 parts by weight, 33.3 parts by weight to 300 parts by weight, and 50 parts by weight to 200 parts by weight of the seaweed pulp based on 100 parts by weight of the lignocellulosic cellulose fibers. It may be included in parts by weight, 50 parts by weight to 150 parts by weight, 80 parts by weight to 120 parts by weight, 90 parts by weight to 110 parts by weight or 100 parts by weight. When the lignocellulosic cellulose fiber and seaweed pulp are included in the content within the above range, the water-dissociable film produced later can have high durability and excellent water-dissociation property. After it is used, it can be removed only by washing with water for recycling.

According to an exemplary embodiment of the present invention, the amount of the lignocellulosic cellulose fiber and the seaweed pulp may be adjusted according to the use of the water dissociable film. For example, when the water dissociable film is used as a label that is used in a dry environment and requires durability, the content of lignocellulosic cellulose fibers may be relatively high, and as a label that is used in a humid environment and requires somewhat low water dissociability, When the water dissociable film is used, the content of seaweed pulp may be relatively large.

According to an exemplary embodiment of the present invention, a water dissociable film may be prepared by desolvating and drying the raw material mixture. Specifically, a water dissociable film may be prepared by forming the raw material mixture into a film shape, removing the solvent included in the raw material mixture, and drying to remove the remaining solvent.

The desolvation process may be performed by any one method selected from vacuum filtration, gravity filtration, compression filtration, and vacuum filtration, but is not limited thereto.

The drying process may be performed by a method used in the art, for example, drying may be performed at a temperature of 60 ° C to 100 ° C, and an adsorption dryer, a heat dryer, a vacuum dryer, or the like may be used.

According to one embodiment of the present invention, a water dissociable film prepared by the above method and having a thickness of 10 μm to 500 μm is provided.

The water dissociable film according to an exemplary embodiment of the present invention can be used as a label material attached to a disposable PET bottle, and can be easily removed by washing with water even without removing the label after the disposable PET bottle is used, thereby increasing environmental protection efficiency. It can be improved, and since biodegradable raw materials are used, it can be discarded without separate treatment, so economic feasibility and eco-friendliness can be excellent.

The water dissociable film according to an exemplary embodiment of the present invention may have a thickness of 10 μm to 500 μm, but is not limited thereto and may be variously adjusted according to the use of the water dissociable film.

According to an exemplary embodiment of the present invention, the water dissociable film may decompose in water within 30 seconds to 10 minutes, within 40 seconds to 5 minutes, within 50 seconds to 4 minutes, and within 1 minute to 3 minutes. In the case of water decomposition within the above range, the film can be removed by simple water washing, and when used as a label for a disposable PET bottle, it can be discarded without separate treatment, so the use of a disposable PET bottle is excellent in economics and eco-friendliness. In the process, it may not be decomposed by external moisture until use is completed.

According to an exemplary embodiment of the present invention, the water dissociable film has a tensile index of 50 Nm/g to 200 Nm/g, 60 Nm/g to 180 Nm/g, 80 Nm/g to 150 Nm/g, or 100 Nm/g. g to 140 Nm/g. When the tensile index is within the above range, the water dissociable film may have excellent durability.

According to one embodiment of the present invention, the water dissociable film may be manufactured and used as a single layer, or may be used in the form of a sheet in which two or more layers are laminated to further secure durability depending on the purpose. That is, according to another embodiment of the present invention, a water dissociable sheet composed of stacking two to ten layers of water dissociable films according to one embodiment of the present invention may be provided.

Hereinafter, examples will be described in detail to explain the present invention in detail. However, embodiments according to the present invention can be modified in many different forms, and the scope of the present invention is not construed as being limited to the embodiments described below. The embodiments herein are provided to more completely explain the present invention to those skilled in the art.

Preparation Example 1

Hardwood bleached kraft pulp (HwBKP) was pretreated with endoglucanase, a cellulose-based enzyme, and then passed through a high-pressure homogenizer at a pressure of 800-1000 bar 7 times to prepare lignocellulosic cellulose fibers having an average particle size of 29 μm.

Preparation Example 2

The hoeer caps were pretreated with an acidic solution and then bleached with hydrogen peroxide to produce hoeers capsular pulp with an average particle size of 37 μm.

Example 1

A lignocellulosic fiber suspension containing 0.0285 g of lignocellulosic cellulose fibers and 10 g of water prepared in Preparation Example 1 was prepared, and a seaweed pulp suspension containing 0.0095 g of crocodile pulp and 10 g of water prepared in Preparation Example 2 were prepared and mixed to prepare a raw material mixture.

A water dissociable film having a thickness of 50 μm and a basis weight of 30 gsm was prepared by drying at 70° C. using an adsorption dryer.

Example 2

A water dissociable film was prepared in the same manner as in Example 1, except that 0.019 g of the lignocellulosic cellulose fiber prepared in Preparation Example 1 was used and 0.019 g of the hoesaeng capsular pulp prepared in Preparation Example 2 was used.

Example 3

A water dissociable film was prepared in the same manner as in Example 1, except that 0.0095 g of the lignocellulosic cellulose fiber prepared in Preparation Example 1 was used and 0.0285 g of the hoesaeng capsular pulp prepared in Preparation Example 2 was used.

Comparative Example 1

The lignocellulosic fiber suspension containing 0.038 g of lignocellulosic cellulose fibers and 10 g of water prepared in Preparation Example 1 was filtered under reduced pressure, dehydrated, and dried at 70 ° C. using an adsorption dryer to obtain water dissociability with a thickness of 50 μm and a basis weight of 50 gsm. A film was made.

Comparative Example 2

The seaweed pulp suspension containing 0.038 g of hoesaeng capsular pulp and 10 g of water prepared in Preparation Example 2 was dehydrated by filtering under reduced pressure and dried using an adsorption dryer at 70° C. to obtain a water dissociable film having a thickness of 50 μm and a basis weight of 50 gsm. was manufactured.

Experimental Example 1: Durability evaluation

Samples were prepared by cutting the water dissociable films prepared in Examples 1 to 3 and Comparative Examples 1 to 2 into 0.5 cm wide and 3 cm long, and tested in accordance with ASTM D 822 using a tensile tester (OTT-005, Oriental TM, Korea). ), the tensile index of the sample was measured. At this time, the load cell load of the measuring instrument was 50 N, the tensile speed was 10 mm/min, and the distance between the measuring instruments was fixed at 3 cm. The measured tensile index is shown in Table 1 below.

Experimental Example 2: Evaluation of water dissociation

The water dissociable films prepared in Examples 1 to 3 and Comparative Examples 1 to 2 were stirred in 10 steps using a magnetic stirrer (Daehan Science, MSH-20D, Korea).

Specifically, the water dissociable films prepared in Examples 1 to 3 and Comparative Examples 1 to 2 were cut into 3 cm wide and 2 cm long, immersed in 50 g of water, and stirred in 10 steps using a magnetic stirrer, The time taken for the water dissociable film to be decomposed into particles having a size of 30% or less of the total area by the low shear force was measured and shown in Table 1 below.

In addition, after 30 seconds, pictures of the water dissociable films prepared in Examples 1 to 3 and Comparative Examples 1 to 2 are shown in FIG. 1 .

Tensile index (Nm/g) water dissociation time (s) Comparative Example 1 133.34 - Example 1 133.76 60 Example 2 91.75 50 Example 3 80.10 40 Comparative Example 2 52.61 30

Referring to Table 1, it can be seen that the water dissociable films prepared in Examples 1 to 3 including lignocellulosic cellulose and seaweed pulp have excellent water decomposability and high tensile index, thereby providing excellent durability. In addition, referring to FIG. 1 , it can be confirmed that the decomposition of the water dissociable films prepared in Examples 1 to 3 progressed to some extent after 30 seconds had passed.

On the other hand, Comparative Example 1 containing only lignocellulosic cellulose could not be measured because the water dissociation time was too long, and as shown in FIG.

In addition, it can be seen that Comparative Example 2 containing only seaweed pulp has a short water dissociation time but a low tensile index and inferior durability.

Although the present invention has been described by limited examples, the present invention is not limited thereto, and the technical spirit of the present invention and claims to be described below by those skilled in the art to which the present invention belongs Of course, various modifications and variations are possible within the equivalent range of.

Claims (12)

Preparing a wood-based biomass pulp using a wood-based biomass raw material;
preparing lignocellulosic cellulose fibers containing at least one of lignocellulosic cellulose microfibers and lignocellulosic cellulose fibrils from the lignocellulosic biomass pulp;
Preparing a suspension of the prepared lignocellulosic cellulose fibers and a suspension of seaweed pulp;
preparing a raw material mixture by mixing the suspension of lignocellulosic cellulose fibers and the suspension of seaweed pulp; and
A method for producing a water dissociable film comprising desolvating and drying the raw material mixture,
The raw material mixture comprises 20 parts by weight to 500 parts by weight of the seaweed pulp based on 100 parts by weight of the lignocellulosic cellulose fibers.
A method for producing a water dissociable film.
According to claim 1,
The seaweed pulp,
A method for producing a water dissociable film, which is produced by a method comprising the step of pre-treating seaweed raw materials with an acidic solution and bleaching them with hydrogen peroxide.
According to claim 2,
The seaweed raw material is selected from the group consisting of capsular seaweed, kelp seaweed, crake seaweed, skein and whipped seaweed, star down hair seaweed, mountain horsetail seaweed, net end seaweed, discosporangium seaweed, downy hair seaweed and shellfish seaweed A method for producing a water dissociable film comprising at least one kind.
According to claim 1,
Based on 100 parts by weight of the seaweed pulp suspension, the content of the seaweed pulp is 0.01 parts by weight to 5 parts by weight.
delete According to claim 1,
The step of preparing the wood-based biomass pulp,
A method for producing a water dissociable film comprising the step of reacting the lignocellulosic biomass raw material with a mixed solvent of glycol ether solvent and acid.
According to claim 1,
The step of preparing the lignocellulosic cellulose fibers,
preparing a wood-based biomass pulp slurry by mixing the wood-based biomass pulp with a basic solution; and
and preparing the lignocellulosic cellulose microfibers by introducing the lignocellulosic biomass pulp slurry into a mixer and kneading it.
According to claim 1,
The step of preparing the lignocellulosic cellulose fibers,
The manufacturing method of the water dissociable film comprising the step of preparing the lignocellulosic cellulose fibrils by homogenizing the lignocellulosic biomass pulp.
According to claim 1,
Based on 100 parts by weight of the lignocellulosic fiber suspension, the content of the lignocellulosic fiber is 0.01 part by weight to 5 parts by weight.
According to claim 1,
The method of manufacturing a water dissociable film in which the lignocellulosic fibers have a lignin content of 0.1% to 30% by weight.
A water dissociable film prepared by the method according to claim 1 and having a thickness of 10 μm to 500 μm.
According to claim 11,
The water dissociable film is a water dissociable film that decomposes within 30 seconds to 10 minutes.

Images