KR20210011892A - Eco-friendly bio-degradable adhesive composition - Google Patents

Abstract

The present invention relates to an adhesive composition having a natural material, such as starch, added to a cellulous solution, and a method for preparing the same. An excellent adhesive strength is provided and separation by water and bio-degrading are possible, such that a label and an adhesive agent are completely removed from a label-attached object through pure water instead of treatment using alkaline water (lye) when a polyethylene terephthalate (PET) bottle is recycled. Accordingly, high-quality recycled PET having high purity may be provided. As the adhesive composition is easily separated from a PET bottle, a recycling process may be simplified and the use of caustic soda is excluded, thereby preventing water from being contaminated by cleaning water. When the cleaning water is discharged, there is no concern of secondary environmental contamination, the physical force of soil is increased, and a deodorizing effect is produced, thereby providing an eco-friendly invention.

Description

Eco-friendly bio-degradable adhesive composition}

The present invention relates to an adhesive composition comprising a cellulose solution, starch, dextrin and glycerin, and a method for producing the same.

Recently, the problem of environmental pollution caused by waste has been seriously raised. In particular, environmental pollution of disposable plastic container waste is serious due to the volume occupied by the plastic and its non-degradability. 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. PET bottles are shredded and recycled as materials such as sewing fibers. Among the components of the bottle, PVC, PET, PP labels, paper or polyolefin labels, etc. must be completely removed. In particular, if even a part of PVC, PET, and PP labels are mixed with PET, chemical changes such as thermal decomposition and carbonization in the PET processing machine occur, making it difficult to process recycled PET and deteriorating the value of the product.

Labels on PET bottles include adhesive labels that are strongly adhered with adhesive and tear-off labels that can be removed by consumers. However, in the case of tear-off labels, the label is not aware that the consumer must remove the label to recycle plastic. It is often discarded in a stuck state. In addition, tear-off labels have a disadvantage that the cost is high because the material used is entirely dependent on imports, and it requires enormous costs to install the facility process to produce them.When recycling treatment, it is soaked in water along with the PET bottle, so separation is complicated. And because of the disadvantage of lowering the recycling rate, the Ministry of Environment applies an excellent recycling grade for adhesive labels. In order to separate the adhesive label from the PET bottle, it is separated by putting it into a separate washing tank in which caustic soda (lye) is diluted in room temperature water. Labels have a lower specific gravity than water, so they float, while a body (pet) with a higher specific gravity than water sinks to the bottom of the separate washing tank and can be separated, and production costs are 4 times lower than that of tear-off labels. There is an advantage.

However, in order to separate the adhesive label from the PET bottle using this caustic soda, the label can be separated from the PET bottle after washing it in caustic soda at a high temperature around 90°C for 30 minutes or more, about 10 times or more. High costs are incurred in the process, and secondary environmental pollution of water and soil due to contaminated water occurs. In addition, the toxic gas generated when dissolved in water may cause irritation to the respiratory system and skin, and there is a risk of explosion if carelessly used. Due to the use of excessive washing water, the amount of wastewater is generated, which adversely affects the water quality protection of the river. In addition, there is a disadvantage that it is difficult to provide high-quality recycled PET because the adhesive material is not completely removed.

In addition, since the adhesive material generally uses petroleum-derived monomers and oil-based solvents as raw materials, boils and bonds them at a high temperature, environmental hormones, ultrafine dust, and raw material molecules generated during manufacture are released into the environment as they are. It creates additional secondary environmental pollution problems. In addition, since most of the adhesive materials consist of a covalent bond in a monomer unit, natural decomposition is difficult, recyclability is impossible after bonding, and environmental pollution problems due to undegraded polymers occur. For example, Henkel's adhesives, which currently dominate the market as adhesives for PET bottle labels, have problems of eye/skin irritation and itchiness when used, including industrial polyester, acrylic, etc. There is a controversy over harmfulness, such as more than twice as many. In addition, when using ink that prints text on the PET bottle itself, there is an advantage in that there is no need to attach a label and the ink component is easily removed by water, but it is difficult to completely remove it, and during recycling due to the adhesive remaining on the PET bottle There is a problem that yellowing occurs. Patent Application No. 10-2011-0029509 relates to a natural adhesive containing protein and free sugar, which exhibits antibacterial and anti-fungal toxicity including allinase and alacine. It does not deal with adhesion and water separation properties for use as adhesives.

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

The inventors of the present invention intend to develop an adhesive composition that can be biodegradable upon release by using natural, starchy, and starch-based edible materials as raw materials, since it is soluble in water, so there is no need to use harmful substances such as caustic soda when separating from the adherend. I tried. As a result, by devising an adhesive composition in which edible materials such as starch and dextrin are added to a cellulose solution, and when applied to plastic labels used in PET bottles, it increases the water holding power with excellent adhesion and water separability, and confirms the odor adsorption effect. The present invention has been completed.

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

One aspect of the present invention for achieving the problem to be solved is cellulose; Starch; It provides an adhesive composition comprising dextrin and glycerin.

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

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

The adhesive composition of the present invention is for labels, sealing, paper, cigarette paper, adhesive block toys, sand sculpting, construction interior and exterior materials, food, food packaging, food container, bathroom kitchen cleaner, deodorant, animal ointment Spray, exfoliating, body hair fixation, hair gel, hair essence, skin essence, soil stabilizer that removes fine dust such as yellow dust or dust generated in factories, water grass and strength enhancer, corrugated board, adhesive for belt, etc. It is possible.

The adhesive composition of the present invention has water separation. Therefore, when the pressure-sensitive adhesive composition of the present invention is used as a pressure-sensitive adhesive, it is easily removed because it is dissociated by water when the pressure-sensitive adhesive is separated from or removed from the substrate or adherend to which it 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 easily dissociated with water, and the dissociated component is also environmentally friendly because it is harmless to living organisms and the environment. In addition, the adhesive composition of the present invention increases soil water retention 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 adhesive such as PE or PP in addition to PET bottles.

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 it is corn starch.

Corn starch has higher crystallinity and amylose content than other types of starch, and has high heat resistance and water dispersibility, so when mixed with dextrin, it exhibits 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 corn starch, the cellulose solution is 100 to 4000 parts by weight, dextrin is 300 to 7000 parts by weight, and glycerin may be included in 200 to 1000 parts by weight. With respect to 100 parts by weight of corn starch, if less than 300 parts by weight of dextrin is included, the adhesive strength is insufficient for use in a label using PET as an adherend, and if it contains more than 7000 parts by weight, the viscosity is too high, so the spreadability of the adhesive is low. There is a problem of losing. In addition, when the glycerin is included in an amount of less than 200 parts by weight, the viscosity decreases and the adhesive is not fixed and flows. 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, it takes a long time to dry.

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

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

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

In one embodiment of the present invention, based on 100 parts by weight of corn starch, the cellulose solution is 1000 to 3000 parts by weight, dextrin is 1000 to 2000 parts by weight, and glycerin may be included in 400 to 600 parts by weight. In an embodiment of the present invention, based on 100 parts by weight of corn starch, the cellulose solution is 2000 parts by weight, dextrin is 1500 parts by weight, and glycerin may be included in 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 adhesive composition further comprises glutinous rice flour, xanthan gum, or a mixture thereof.

In one embodiment of the present invention, the glutinous rice powder, 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 in a range of 5 to 12 hours at a temperature of 40 to 50°C.

Another aspect of the present invention

1) preparing a cellulose solution for stirring a mixture of cellulose and water; 2) preparing a starch system by mixing at least one starch 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 thickening liquid.

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

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

With respect to 100 parts by weight of corn starch, if less than 300 parts by weight of dextrin is included, the adhesive strength is insufficient for use in a label using PET as an adherend, and if it contains more than 7000 parts by weight, the viscosity is too high, so the spreadability of the adhesive is low. There is a problem of losing. In addition, when the glycerin is included in an amount of less than 200 parts by weight, the viscosity decreases and the adhesive is not fixed and flows. 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, it takes a long time to dry.

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

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

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

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

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

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 in a range of 5 to 12 hours at a temperature of 40 to 50°C.

Another aspect of the present invention is a step of bonding the adhesive composition to the first substrate by applying the adhesive composition to the first substrate; And attaching the first substrate and the second substrate to each other by contacting the first substrate to which the composition is bonded to the second substrate. It provides a method of attaching the first substrate and the 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 and second substrates may be the same material. The adhesive composition or adhesive product according to an embodiment is a water-separable adhesive, which can be used as a label, an adhesive tape, a spray-type adhesive, a dust remover, etc., and can be easily removed without damaging the adherend using water, and a packaging material Can be easily recycled. And when this composition or product is applied to the fields of pesticides and seeds, it has the advantage that it can be easily removed with water after using the adhesive-containing composition, so that the scope 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 to which the adhesive composition is applied can be easily and completely removed from the adherend even in pure water not treated with alkaline water. So, when the adhesive composition of the present invention is applied to a label used for a PET bottle, there is an advantage of providing high 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, there is no concern of secondary environmental pollution when discharged, and the physical force of the soil It is an environmentally friendly invention that increases and has a deodorizing effect.

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

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms different from each other, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims. With reference to the accompanying drawings below will be described in detail for the implementation of the present invention. Regardless of the drawings, the same reference numerals refer to the same elements, and "and/or" includes each and all combinations of one or more of the mentioned items.

The terms used in the present specification are for describing exemplary embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, “comprises” and/or “comprising” do not exclude the presence or addition of one or more other elements other than the mentioned elements.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings that can be 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 interpreted ideally or excessively unless explicitly defined specifically.

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

Preparation of adhesive composition

A starch system was prepared in 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 ℃.

The starch system and the cellulose solution were mixed to prepare a slurry using a stirrer at room temperature, and the slurry was gelatinized to prepare a thin liquid to prepare an adhesive composition.

The 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 an adhesive composition using an amino acid solution containing lysine, citric acid, and water that 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

Using a viscometer (manufacturer: TA instrument Std, brand name: DHR1) using a rotary rheometer to determine the viscosity of the adhesive composition (Examples 1 to 4) prepared by the above method, 25°C, 0.1 to 900 (1/s) Shear rate It was measured under conditions. 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, a viscosity of 80 to 120 (cp) was confirmed, and it was confirmed that it is 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 conducted by repeating the frozen state and the room temperature state 6 times. After moving from freezing to room temperature, water condensation occurred on the surface of the PET bottle, and then adhesion was checked, and it was confirmed that the adhesion was maintained regardless of temperature change (FIG. 2). It was confirmed that the adhesive strength of the labels coated with Comparative Examples 2 to 4 was also maintained regardless of the temperature change, but it was confirmed that the label to which Comparative Example 1 was applied was easily separated from the PET bottle according to the temperature change and thus the adhesion was not maintained.

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

Adhesive name Type of adherend 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 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 adhesive strength that can be peeled off only when force is applied to a finger. In addition, it was confirmed that the adhesive composition of Example 2 exhibited a very high level of adhesive strength when using PET as an adhesive. It was confirmed that the adhesive compositions of Examples 1 to 4 prepared by the present invention have higher adhesive strength compared to Comparative Examples 1 to 3.

In addition, the adhesive composition of Examples 1 to 4 compared to the adhesion (average 3 kgf to 8 kgf) of a multipurpose adhesive targeting metal, rubber, leather, cork, plastic, fiber (felt), leather, wood, and soft foam. It was confirmed that it has a similar or high level of adhesion (3 kgf ~ 14 kgf).

Water separation test

The 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: After applying the adhesive composition of the present application to a thickness of 50 ~ 60㎛ on the top of the PP film and dried at 30 ℃ for 20 minutes. The dried result was cut into a size of 30 mm x 50 mm, attached to a PET bottle, and pressed and bonded using a hand roller to prepare a specimen. Each specimen is completely immersed in distilled water at 200 rpm using a stirrer i) After 1 minute ii) After 5 minutes iii) After 10 minutes iv) After 20 minutes ⅴ) After 30 minutes ⅵ) After 1 hour Then, the state of the specimen was checked. Thereafter, the time until the adhesive composition or the adhesive was completely removed from the substrate from the specimen was measured to evaluate the water separability of the specimen. The evaluation results are shown in Table 4 below.

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

As a result, it was confirmed that the adhesive compositions of Examples 1 to 4 dissolve the adhesive within 20 minutes after immersing the PET bottle in water and separate the label, and it was confirmed that no adhesive and adhesive marks were left on the PET bottle.

Deodorization power evaluation

In order to evaluate the deodorizing power of the adhesive compositions (Examples 1 to 4) prepared by the above method, a substrate having a size of 100 x 200 mm was put into a 5 L reactor and sealed. Test gases 50 μmol/mol of ammonia, 50 μmol/mol of trimethylamine, 50 μmol/mol of hydrogen sulfide, 50 μmol/mol of methylmercaptan, 50 μmol/mol of acetaldehyde, 50 μmol/mol of toluene, and 20 μmol/mol of formaldehyde were injected at the initial concentration, The concentration of the test gas was measured at 0 minutes, 30 minutes, 60 minutes, 90 minutes, and 120 minutes, 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 conducted in the absence of the adhesive composition, and the concentration reduction rate of the test gas at the end of the test was expressed in %.

As a result, compared to the control group, the adhesive composition (Examples 1 to 4) showed very high deodorizing power for ammonia and trimethylamine at 99.5% or more, and also in hydrogen sulfide, methylmercaptan, acetaldehyde, toluene, and formaldehyde. It was confirmed that it showed a high deodorizing power of 30% or more. On the other hand, in Comparative Examples 1 and 4, the deodorizing power for ammonia and trimethylamine was lower than in the examples, 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. As a result, the leaves of the plant that died 2 weeks after the solution was added, It was confirmed that the stem found vitality, and it was confirmed that the growth of the plant was promoted 1 month after the solution was added (FIG. 3).

Claims (16)

Cellulose solution ; Starch; Adhesive composition comprising dextrin and glycerin. The adhesive composition of 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. The adhesive composition of claim 1, wherein the starch is corn starch. The adhesive composition of claim 3, wherein the cellulose solution is 100 to 200 parts by weight, dextrin 200 to 400 parts by weight, and glycerin is 100 to 300 parts by weight, based on 100 parts by weight of corn starch. The adhesive composition of claim 1, wherein the cellulose solution further comprises one or more solvents selected from the group consisting of primary alcohols, polyhydric alcohols, diols and triols. The adhesive composition of claim 1, wherein the adhesive composition is applied to a PET label. The adhesive composition according to any one of claims 1 to 6, further comprising glutinous rice powder, xanthan gum, or a mixture thereof. The adhesive composition of claim 7, wherein the adhesive composition comprises 1 to 100 parts by weight of the glutinous rice powder, xanthan gum, or a mixture thereof. The adhesive composition according to any one of claims 1 to 8, wherein the starch and dextrin are fermented. 1) preparing a cellulose solution for stirring a mixture of cellulose and water;
2) preparing a starch system by mixing at least one starch 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 and glycerin with the starch system and the cellulose solution; And
4) A method for producing an adhesive composition comprising the step of preparing a thick liquid by gelatinizing the slurry. The method of claim 10, wherein the starch in step 2) is corn starch. The method of claim 11, wherein the cellulose solution is 100 to 200 parts by weight, dextrin 200 to 400 parts by weight, and glycerin is 100 to 300 parts by weight based on 100 parts by weight of the corn starch. The method for preparing an adhesive composition according to claim 10, wherein glutinous rice powder, xanthan gum, or a mixture thereof is added to the step 3) preparing the slurry. The method of claim 13, wherein the glutinous rice powder, xanthan gum, or a mixture thereof is 1 to 100 parts by weight. The method of claim 10, further comprising a step of fermenting the starch and dextrin. The method of claim 10, wherein the adhesive composition is applied to a PET label.

Images