KR20220127216A - Eco-friendly bio-degradable adhesive composition - Google Patents

Abstract

The present invention relates to an adhesive composition in which natural materials such as starch are added to a cellulose solution, and a manufacturing method thereof. According to the present invention, since the adhesive composition has excellent adhesiveness and is capable of water separation and biodegradation, during recycling PET bottles, it is possible to completely remove a label and adhesive from an adherend when the label comes into contact with water in pure water, not by alkaline water (lye) treatment, thereby providing an advantage of providing recycled PET of high purity and high quality. In addition, since the adhesive composition is easily separated from a PET bottle, a regeneration process is simplified and use of caustic soda is excluded such that water contamination by washing water can be prevented, secondary environmental pollution can be prevented when the washing water is released, physical force of soil can be increased, and a deodorizing effect can be provided. A biodegradable adhesive composition comprises a cellulose solution, starch, dextrin, glycerin, glutinous rice flour, and oil.

Description

Eco-friendly bio-degradable adhesive composition

The present invention relates to a pressure-sensitive adhesive composition comprising a cellulose solution, starch, dextrin and glycerin, and a method for preparing the same.

Recently, the problem of environmental pollution by waste has been seriously highlighted. In particular, the environmental pollution of single-use plastic container waste is serious due to the volume occupied by the plastic and its recalcitrance. In the case of PET (Polyethylene terephthalate) bottles, which are widely used as beverage containers, production is increasing by about 7% every year, and imports are also increasing every year. Among the components of the bottle, PVC, PET, PP labels, paper or polyolefin labels must be completely removed. In particular, if PVC, PET, or PP labels are mixed with PET, chemical changes such as thermal decomposition and carbonization occur in the PET processing machine, making it difficult to process recycled PET and lowering the value of the product.

Labels attached to PET bottles include adhesive labels that are strongly attached with adhesive and tear-off labels that consumers can remove. They are often thrown away while stuck. In addition, the cost of the perforated label is high because the material used is entirely dependent on imports, and there are disadvantages in that a large cost is required for the installation of the equipment process for manufacturing it, and the separation is complicated as it sinks in water along with the PET bottle during recycling treatment. Since the recycling rate is low, the Ministry of Environment is applying the excellent recycling grade for adhesive labels. In order to separate the adhesive label from the PET bottle, it is put into a separation washing tank in which caustic soda (lye) is diluted in water at room temperature to separate it. The label has a lower specific gravity than that of water and floats, while the body (PET), which has a higher specific gravity than water, sinks to the bottom of the separation washing tank, making separation possible. There are advantages.

However, in order to separate the adhesive label from the PET bottle using such caustic soda, it must be washed in caustic soda (lye) at a high temperature of about 90°C for 30 minutes or more, about 10 times or more to separate the label from the PET bottle. A high cost is incurred in the process, and secondary environmental pollution problems of water quality and soil due to contaminated water occur. In addition, the toxic gas generated when dissolved in water may cause irritation to the respiratory tract and skin, and there is a risk of explosion if used carelessly. Excessive use of washing water produces a large amount of wastewater, which adversely affects the protection of river water quality. In addition, since the adhesive material is not completely removed, it is difficult to provide high-quality recycled PET.

In addition, adhesive materials generally use petroleum-derived monomers and oil-based solvents as raw materials and boil at a high temperature for application and adhesion. It creates an additional secondary environmental pollution problem. In addition, since most adhesive materials have monomer units formed of covalent bonds, they are difficult to decompose naturally, cannot be recycled after adhesion, and environmental pollution problems occur due to undecomposed polymers. For example, Henkel's adhesives, which are currently dominating the market as adhesives for PET bottle labels, contain industrial polyester and acrylic, which cause eye and skin irritation and itching when used. There is controversy about the harmfulness, such as exceeding twice. In addition, when using the ink for printing text on the PET bottle itself, there is no need to attach a label, and the ink component is easily erased by water, but it is difficult to completely remove, and due to the adhesive remaining on the PET surface, it is There is a problem that yellowing occurs. Patent Application No. 10-2011-0029509 is a natural adhesive containing protein and free sugar, and relates to a natural adhesive having antibacterial and antifungal toxicity containing alliinase and alacine. It does not deal with adhesive strength and water separation properties for use as adhesives.

Patent Document 1: Patent Application No. 10-2011-0029509

The present inventors are soluble in water, so there is no need to use harmful substances such as caustic soda when separated from the adherend. tried As a result, an adhesive composition in which edible materials such as starch and dextrin are added to a cellulose solution was devised and applied to plastic labels used for PET bottles, etc. The present invention was completed.

Accordingly, an object of the present invention is to provide an eco-friendly adhesive composition comprising a cellulose solution, starch, dextrin, etc. as an active ingredient and a method for preparing the same.

One aspect of the present invention for achieving the above object is cellulose; starch; Provided is an adhesive composition comprising dextrin and glycerin.

Adhesive articles obtained by coating and drying the adhesive composition on a substrate include, for example, PVC, PP, PE , PET labels, oriented polypropylene (OPP) tapes. When the adhesive composition is applied to the substrate and dried, an adhesive layer containing a viscoelastic material is formed on the substrate.

All of the above substrates can be used as long as the adhesive composition can be applied to an adherend in the art. The substrate may be, for example, a polymer film. The polymer film is, for example, polyethylene, polypropylene (PP), tylene / propylene copolymer, polybutene-1, ethylene / vinyl acetate copolymer, polyethylene / styrene butadiene rubber mixture, polyolefin films such as polyvinyl chloride film, etc. this can be used In addition, plastics such as polyethylene terephthalate (PET), polycarbonate, and poly(methyl methacrylate), polyurethane, and thermoplastic elastomers such as polyamide-polyol copolymer, and mixtures thereof may be used.

The adhesive composition of the present invention is suitable for labeling, sealing, painting, cigarette paper, adhesive block toys, sand sculpture, construction interior and exterior materials, food, food packaging, food container, bathroom kitchen cleaner, deodorization, animal ointment For spraying, exfoliating, fixing body hair, hair gel, hair essence, skin essence, soil stabilizer that removes fine dust such as yellow sand or dust generated in factories, water grass and intellectual strength enhancer, corrugated cardboard, adhesive for paper, etc. It is possible.

The adhesive composition of the present invention has water-separability. Accordingly, when the pressure-sensitive adhesive composition of the present invention is used as a pressure-sensitive adhesive, the pressure-sensitive adhesive is easily removed because it is dissociated by water when separated from or removed from the substrate or adherend to which the pressure-sensitive adhesive is applied. Specifically, the pressure-sensitive adhesive applied to the substrate or adherend may be dissociated within 1 hour, specifically within 30 minutes, and more specifically within 20 minutes using water at room temperature (25° C.) or higher. The adhesive composition of the present invention is environmentally friendly because it is easily dissociated with water and the dissociated component is also harmless to living organisms and the environment. In addition, the pressure-sensitive adhesive composition of the present invention increases the soil holding capacity and has a deodorizing effect. The adhesive composition of the present invention may be used for adhesion of a polymer film label to a PET bottle, and may be used for adhesion of a polymer film label to a plastic adherend such as PE or PP in addition to a PET bottle.

In one embodiment of the present invention, the concentration of the cellulose solution is in the range of 1 to 99% (w/v).

In one embodiment of the present invention, the starch is at least one selected from the group consisting of tapioca starch, corn starch, wheat starch, potato starch, banana starch and sweet potato starch, egg white starch, and hydroxyethyl cellulose.

In one embodiment of the present invention. The starch is characterized in that corn starch.

Corn starch has high crystallinity and amylose content compared to other types of starch, and has high heat resistance and water dispersibility, so that when mixed with dextrin, it shows excellent adhesion compared to mixing with other types of starch, and is suitable as an adhesive for PET labels. indicates the viscosity.

In one embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 100 to 4000 parts by weight, dextrin may be included in an amount of 300 to 7000 parts by weight, and glycerin may be included in an amount of 200 to 1000 parts by weight. When the amount of dextrin is less than 300 parts by weight based on 100 parts by weight of corn starch, the adhesive strength is insufficient to be used in a label using PET as an adherend, and when it contains more than 7000 parts by weight, the viscosity is too high and the spreadability of the adhesive is low. There is a problem with losing. In addition, when glycerin is included in an amount of less than 200 parts by weight, there is a problem in that the viscosity is lowered and the adhesive flows without being fixed. With respect to 100 parts by weight of corn starch, when the cellulose solution is less than 100 parts by weight, the viscosity decreases, and when it exceeds 4000 parts by weight, a long drying time is required.

In one embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 100 to 200 parts by weight, dextrin may be included in an amount of 200 to 400 parts by weight, and glycerin may be included in an amount of 100 to 300 parts by weight. In one embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 150 parts by weight, dextrin may be included in an amount of 300 parts by weight, and glycerin may be included in an amount of 200 parts by weight.

In one embodiment of the present invention, based on 100 parts by weight of the corn starch, 200 to 300 parts by weight of the cellulose solution, 20 to 80 parts by weight of dextrin, and 20 to 80 parts by weight of glycerin may be included. In an embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 250 parts by weight, dextrin may be included in an amount of 50 parts by weight, and glycerin may be included in an amount of 50 parts by weight. In this case, the adhesive strength is insufficient to be used as an adhesive for PET labels, but it has excellent viscosity stability with an average viscosity of 70,000 CP and excellent deodorization power, so it is suitable for use as an eco-friendly adhesive for office and stationery. In addition, it is non-irritating as a result of the skin irritation test and the physical force of the soil, and it has excellent stability, so it has properties suitable for home and office use. In one embodiment of the present invention, the curing speed may be increased by additionally including oil in the component. The oil may be coconut oil or palm oil, and the curing speed and adhesion of the adhesive may be improved by the addition of the oil.

In one embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 2000 to 4000 parts by weight, dextrin may be included in an amount of 5000 to 7000 parts by weight, and glycerin may be included in an amount of 700 to 900 parts by weight. In an embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 3000 parts by weight, dextrin may be included in an amount of 6000 parts by weight, and glycerin may be included in an amount of 800 parts by weight.

In one embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 1000 to 3000 parts by weight, dextrin may be included in an amount of 1000 to 2000 parts by weight, and glycerin may be included in an amount of 400 to 600 parts by weight. In an embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 2000 parts by weight, dextrin may be included in an amount of 1500 parts by weight, and glycerin may be included in an amount of 500 parts by weight.

In one embodiment of the present invention. The cellulose solution further includes one or more solvents selected from the group consisting of primary alcohols, polyhydric alcohols, diols and triols.

In another aspect of the present invention, the pressure-sensitive adhesive composition further comprises glutinous rice flour, xanthan gum, or a mixture thereof.

In one embodiment of the present invention, the glutinous rice flour, xanthan gum, or a mixture thereof is included in an amount of 1 to 100 parts by weight.

In one embodiment of the present invention, the corn starch and dextrin may be additionally subjected to a fermentation process after mixing, and the fermentation process may be performed at a temperature of 40 to 50° C. for 5 to 12 hours.

Another aspect of the present invention is

1) preparing a cellulose solution by stirring a mixture of cellulose and water; 2) preparing a starch system by mixing one or more starches selected from the group consisting of tapioca starch, corn starch, wheat starch, potato starch, banana starch, sweet potato starch, egg white starch and hydroxyethyl cellulose; 3) preparing a slurry by mixing dextrin and glycerin with the starch system and the cellulose solution; and 4) gelatinizing the slurry to prepare a paste solution.

In one embodiment of the present invention, the starch system in step 2) is prepared from corn starch.

In one embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 100 to 4000 parts by weight, dextrin may be included in an amount of 20 to 7000 parts by weight, and glycerin may be included in an amount of 20 to 1000 parts by weight.

When the amount of dextrin is less than 300 parts by weight based on 100 parts by weight of corn starch, the adhesive strength is insufficient to be used in a label using PET as an adherend, and when it contains more than 7000 parts by weight, the viscosity is too high and the spreadability of the adhesive is low. There is a problem with losing. In addition, when glycerin is included in an amount of less than 200 parts by weight, there is a problem in that the viscosity is lowered and the adhesive flows without being fixed. With respect to 100 parts by weight of corn starch, when the cellulose solution is less than 100 parts by weight, the viscosity decreases, and when it exceeds 4000 parts by weight, a long drying time is required.

In one embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 100 to 200 parts by weight, dextrin may be included in an amount of 200 to 400 parts by weight, and glycerin may be included in an amount of 100 to 300 parts by weight. In one embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 150 parts by weight, dextrin may be included in an amount of 300 parts by weight, and glycerin may be included in an amount of 200 parts by weight.

In one embodiment of the present invention, based on 100 parts by weight of the corn starch, 200 to 300 parts by weight of the cellulose solution, 20 to 80 parts by weight of dextrin, and 20 to 80 parts by weight of glycerin may be included. In an embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 250 parts by weight, dextrin may be included in an amount of 50 parts by weight, and glycerin may be included in an amount of 50 parts by weight. In this case, the adhesive strength is insufficient to be used as an adhesive for PET labels, but it has excellent viscosity stability with an average viscosity of 70,000 CP and excellent deodorization power, so it is suitable for use as an eco-friendly adhesive for office and stationery. In addition, it is non-irritating as a result of the skin irritation test and the physical force of the soil, and it has excellent stability, so it has properties suitable for home and office use. In one embodiment of the present invention, the curing speed may be increased by additionally including oil in the component. The oil may be coconut oil or palm oil, and the curing speed and adhesion of the adhesive may be improved by the addition of the oil.

In one embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 2000 to 4000 parts by weight, dextrin may be included in an amount of 5000 to 7000 parts by weight, and glycerin may be included in an amount of 700 to 900 parts by weight. In an embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 3000 parts by weight, dextrin may be included in an amount of 6000 parts by weight, and glycerin may be included in an amount of 800 parts by weight.

In one embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 1000 to 3000 parts by weight, dextrin may be included in an amount of 1000 to 2000 parts by weight, and glycerin may be included in an amount of 400 to 600 parts by weight. In an embodiment of the present invention, based on 100 parts by weight of the corn starch, the cellulose solution may be included in an amount of 2000 parts by weight, dextrin may be included in an amount of 1500 parts by weight, and glycerin may be included in an amount of 500 parts by weight.

In one embodiment of the present invention, glutinous rice flour, xanthan gum, or a mixture thereof is added in step 3) for preparing the slurry.

In one embodiment of the present invention, 1 to 100 parts by weight of the glutinous rice flour, xanthan gum or a mixture thereof is included.

In one embodiment of the present invention, the corn starch and dextrin may be additionally subjected to a fermentation process after mixing, and the fermentation process may be performed at a temperature of 40 to 50° C. for 5 to 12 hours.

Another aspect of the present invention comprises the steps of applying the pressure-sensitive adhesive composition to a first substrate to bond the pressure-sensitive adhesive composition to the first substrate; and contacting the first substrate to which the composition is bonded with the second substrate to attach the first substrate and the second substrate to each other; It provides a method of attaching a first substrate and a second substrate comprising a. In an embodiment of the present invention, the first substrate may be a PP, PET, or PVC substrate, and the second substrate may be a PP, PVC, or PET bottle.

In one embodiment of the present invention. The first substrate and the second substrate may be the same material. The pressure-sensitive adhesive composition or pressure-sensitive adhesive product according to one embodiment may be used as a water-removable pressure-sensitive adhesive for labels, adhesive tapes, spray-type pressure-sensitive adhesives, dust removers, etc. can be easily recycled. And when this composition or product is applied to pesticides and seed fields, there is an advantage that it can be easily removed with water after using the pressure-sensitive adhesive-containing composition, so that the range of application can be broadened.

The adhesive composition of the present invention described above uses an edible material as a raw material and is biodegradable when released and has high adhesive strength, and the substrate coated with the adhesive composition can be easily and completely removed from the adherend even in pure water that is not treated with alkaline water. Therefore, when the adhesive composition of the present invention is applied to a label used for a PET bottle, there is an advantage of providing good quality recycled PET. As the adhesive composition is easily separated from the PET bottle, the regeneration process is simplified, the use of caustic soda is excluded to prevent water pollution by washing water, and there is no concern of secondary environmental contamination when released, and the physical force of the soil This is an eco-friendly invention that has a deodorizing effect and is increased.

1 is a formulation example of the adhesive composition of the present invention.
2 is a test result of the adhesive strength of the present invention adhesive composition.
3 is a result of soil physical force analysis of the adhesive composition of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Detailed contents for carrying out the present invention will be described in detail with reference to the accompanying drawings below. Irrespective of the drawings, like reference numbers refer to like elements, and "and/or" includes each and every combination of one or more of the recited items.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

Hereinafter, an adhesive composition according to embodiments of the present invention and a manufacturing method thereof will be described.

Adhesive composition preparation

A starch system was prepared at the mixing ratio shown in Table 1 below. Blending was performed using a Hot Plate & Spindle Bar or a stirrer and a heating mantle under the conditions of 40 ~ 50 °C.

A slurry was prepared by mixing the starch-based solution with the cellulose solution at room temperature using a stirrer, and the slurry was gelatinized to prepare a paste to prepare a pressure-sensitive adhesive composition.

Adhesive compositions of Examples 1 to 4 and Comparative Examples 1 to 4 were prepared by mixing in the same ratio as in Table 1 below. Comparative Example 1 is a pressure-sensitive adhesive composition using an amino acid solution containing lysine, citric acid and water, which exists in the form of an aqueous salt solution and does not form a precipitate in the aqueous solution.

corn starch Cellulose solution dextrin glycerin glutinous rice flour Example 1 100 250 50 50 - Example 2 100 150 300 200 100 Example 3 100 3,000 6,000 800 100 Example 4 100 2,000 1,500 500 50 Comparative Example 1 - - (100, using amino acid solution) - - - Comparative Example 2 100 90 190 200 100 Comparative Example 3 100 2,100 7,100 200 100 Comparative Example 4 100 100 900 100 -

viscosity evaluation

The viscosity of the adhesive composition (Examples 1 to 4) prepared by the above method was measured using a viscometer (manufacturer: TA instrument Std, trade name: DHR1) using a rotary rheometer at 25° C., 0.1 to 900 (1/s) shear rate conditions were measured. The viscosity measured under the condition of 1 (1/s) shear rate is shown in Table 2.

Viscosity (cp) Example 1 73.980 Example 2 72.850 Example 3 70.230 Example 4 99.600 Comparative Example 1 31.500 Comparative Example 2 30.250 Comparative Example 3 80.780 Comparative Example 4 78.250

As a result, the viscosity of 80 to 120 (cp) was confirmed, and it was confirmed that this was an appropriate level as an adhesive used for PP, PET, and PVC substrates.

Adhesion evaluation

The adhesive composition (Examples 1 to 4) prepared by the above method was applied to a plastic label to perform an adhesion test. The test was performed by repeating the frozen state and the room temperature state 6 times. After moving from freezing to room temperature, adhesion was checked after water condensation occurred on the surface of the PET bottle, and it was confirmed that the adhesive force was maintained regardless of temperature change (FIG. 2). It was confirmed that the labels coated with Comparative Examples 2 to 4 also maintained the adhesive force regardless of the temperature change, but it was confirmed that the label coated with Comparative Example 1 was easily separated from the PET bottle according to the temperature change and did not maintain the adhesive force.

In addition, a light resistance test (ASTM G 154) of the peel strength specimen was performed for quantitative evaluation of the adhesive force. It was applied to a PP label, and an adhesion test was performed on PET and PP substrates. The substrate was manufactured to have a width of 2.5 x 10 cm and tested according to ASTM D 1876 at 60±3° C. for 24 hours and 48 hours, respectively.

Adhesive name Adhesive type Kgf/cm2 gf/cm2 Example 1 PP 3.712367 3712.367 PET 7.654781 7654.781 Example 2 PP 4.846939 4846.939 PET 14.54082 14540.82 Example 3 PP 3.571429 3571.429 PET 5.6122455 5612.245 Example 4 PP 3.398374 3398.374 PET 5.448734 5448.734 Comparative Example 1 PP 0.132435 132.435 PET 0.224545 224.545 Comparative Example 2 PP 3.212356 3212.356 PET 7.875687 7875.687 Comparative Example 3 PP 3.474534 3474.534 PET 8.223435 8223.435 Comparative Example 4 PP 0.412345 412.345 PET 0.734523 734.523

As a result, the pressure-sensitive adhesive compositions (Examples 1 to 4) exhibited an adhesive strength of 1,500 gf/cm ² or more at room temperature, which is a high level of adhesive strength that can be peeled off by applying force to a finger. In addition, it was confirmed that the adhesive composition of Example 2 exhibits a very high level of adhesion when PET is used as an adherend. It was confirmed that the adhesive compositions of Examples 1 to 4 prepared by the present invention had higher adhesive strength than Comparative Examples 1 to 3.

In addition, the adhesive composition of Examples 1 to 4 compared to the adhesive strength (average 3 kgf to 8 kgf) of the multi-purpose adhesive for metal, rubber, leather, cork, plastic, fiber (felt), leather, wood, and soft foam was confirmed to have a similar or high level of adhesion (3 kgf ~ 14 kgf).

water separation test

Water separation properties of the adhesive compositions (Examples 1 to 4) and Comparative Examples 1 to 3 of the present invention were evaluated. The method for evaluating the water-separability is as follows: The pressure-sensitive adhesive composition of the present application was applied to a thickness of 50 to 60 μm on a PP film, and then dried at 30° C. for 20 minutes. The dried resultant was cut into a size of 30 mm x 50 mm, attached to a PET bottle, and adhered by pressing using a hand roller to prepare a specimen. After immersing each specimen in distilled water completely at 200 rpm using a stirrer at 200 rpm i) After 1 minute ii) After 5 minutes iii) After 10 minutes iv) After 20 minutes ⅴ) After 30 minutes ⅵ) After 1 hour After that, the state of the specimen was confirmed. Then, the time until the pressure-sensitive adhesive composition or the pressure-sensitive adhesive is completely removed from the substrate was measured to evaluate the water-separability of the specimen. The evaluation results are shown in Table 4 below.

water separation Example 1 Disconnected within 30 minutes Example 2 Disconnected within 30 minutes Example 3 Disconnected within 30 minutes Example 4 Disconnected within 30 minutes Comparative Example 1 Disconnected within 30 minutes Comparative Example 2 Disconnected within 30 minutes Comparative Example 3 Disconnected within 40 minutes Comparative Example 4 Separated within 1 hour

As a result, the adhesive compositions of Examples 1 to 4 confirmed that the adhesive melted within 20 minutes after immersing the PET bottle in water and label separation was possible, and it was confirmed that the adhesive and adhesive marks did not remain on the PET bottle.

Deodorizing power evaluation

In order to evaluate the deodorizing power of the pressure-sensitive adhesive composition (Examples 1 to 4) prepared by the above method, a substrate having a size of 100 x 200 mm was placed in a 5L reactor and sealed. Test gas ammonia 50 μmol/mol, trimethylamine 50 μmol/mol, hydrogen sulfide 50 μmol/mol, methyl mercaptan 50 μmol/mol, acetaldehyde 50 μmol/mol, toluene 50 μmol/mol, formaldehyde 20 μmol/mol were injected as initial concentrations, The test gas concentration was measured at 0 min, 30 min, 60 min, 90 min, and 120 min, respectively. The concentration of the test gas was measured by a gas detection tube (SPS-KCLI2218-6218), and was measured at 23±5.0°C. As a control, the test was carried out in the absence of an adhesive composition, and the percentage reduction in the concentration of the test gas was indicated by the number of test completions.

As a result, compared to the control group, the deodorizing power for ammonia and trimethylamine in the pressure-sensitive adhesive composition (Examples 1 to 4) was 99.5% or more, which was very high, and hydrogen sulfide, methyl mercaptan, acetaldehyde, toluene, and formaldehyde It was confirmed that a high deodorizing power of 30% or more was exhibited. On the other hand, in Comparative Examples 1 and 4, the deodorizing power against ammonia and trimethylamine was lower than that of the Example, and hydrogen sulfide, methyl mercaptan, acetaldehyde, toluene, and formaldehyde showed less than 10% deodorizing power.

Soil physics evaluation

A solution in which the adhesive composition (Examples 1 to 4) prepared by the above method and water were mixed in a ratio of 1: 10 was added to the plant. It was confirmed that the stem found vitality, and it was confirmed that the growth of the plant was promoted when one month passed after the solution was added (FIG. 3).

Claims (18)

cellulose solution; starch; dextrin; glycerin; A biodegradable adhesive composition comprising glutinous rice flour and oil. According to claim 1,
Wherein the starch is at least one selected from the group consisting of tapioca starch, corn starch, wheat starch, potato starch, banana starch, sweet potato starch, and egg white starch. According to claim 1,
The starch is a biodegradable adhesive composition of corn starch. 4. The method of claim 3,
Based on 100 parts by weight of the corn starch, the cellulose solution is 100 to 200 parts by weight, dextrin is 200 to 400 parts by weight, glycerin is 100 to 300 parts by weight, and glutinous rice flour is 1 to 100 parts by weight. composition. According to claim 1,
The cellulose solution is a biodegradable adhesive composition further comprising one or more solvents selected from the group consisting of primary alcohols, polyhydric alcohols, diols and triols. According to claim 1,
The adhesive composition is a biodegradable adhesive composition that is applied to a label for PET. The method of claim 1,
A biodegradable adhesive composition further comprising xanthan gum. 8. The method of claim 7,
A biodegradable adhesive composition comprising 1 to 100 parts by weight of the xanthan gum. According to claim 1,
The starch and dextrin are fermented biodegradable adhesive composition. According to claim 1,
The oil is a biodegradable pressure-sensitive adhesive composition to increase the curing rate and adhesiveness of the pressure-sensitive adhesive. 11. The method of claim 10,
The oil is a biodegradable adhesive composition of coconut oil or palm oil. 1) preparing a cellulose solution by stirring a mixture of cellulose and water;
2) preparing a starch system by mixing one or more starches selected from the group consisting of tapioca starch, corn starch, wheat starch, potato starch, banana starch, sweet potato starch, and egg white starch;
3) preparing a slurry by mixing dextrin, glycerin, glutinous rice flour and oil with the starch system and the cellulose solution; and
4) A method for producing a biodegradable adhesive composition comprising the step of gelatinizing the slurry to prepare a paste. 13. The method of claim 12,
The method for preparing a biodegradable adhesive composition wherein the starch in step 2) is corn starch. 14. The method of claim 13,
Based on 100 parts by weight of the corn starch, the cellulose solution is 100 to 200 parts by weight, dextrin is 200 to 400 parts by weight, glycerin is 100 to 300 parts by weight, and glutinous rice flour is 1 to 100 parts by weight. A method for preparing an adhesive composition. 13. The method of claim 12,
3) A method for preparing a biodegradable adhesive composition for adding xanthan gum in the step of preparing a slurry. 16. The method of claim 15,
A method for preparing a biodegradable adhesive composition comprising the xanthan gum in an amount of 1 to 100 parts by weight. 13. The method of claim 12,
A method for producing a biodegradable adhesive composition further comprising a step of fermenting the starch and dextrin. 13. The method of claim 12,
The adhesive composition is a biodegradable adhesive composition manufacturing method that is applied to a label for PET.

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