KR102668691B1 - natural adhesive suspension composition for coated carbonized cork - Google Patents

Abstract

The present invention provides an adhesive suspension composition for carbonized cork coating comprising modified gum rosin and glycerol.

Description

Natural adhesive suspension composition for coated carbonized cork, method for producing coated carbonized cork using the same composition, and compression molded product containing coated carbonized cork obtained by the same method {natural adhesive suspension composition for coated carbonized cork}

The present invention relates to a natural adhesive suspension composition for carbonized cork and its application technology. The natural adhesive suspension composition and its manufacturing method and the application of the composition to carbonized cork have no harm to the human body, have excellent antibacterial activity and deodorizing effect, It relates to compression molded products that can be developed into various types of products and have significantly improved physical properties.

Cork is a protective tissue that grows massively around the stems, branches, and roots of evergreen trees belonging to the Quercus family and exhibits a regular arrangement of cells. The cell walls are formed by depositing a polymer of fatty acid called suberin to form a thick layer that allows water or water to pass through. It is difficult for gas to pass through, has a very low density due to its hexagonal porous structure, has excellent elasticity and shock absorption ability, is resistant to friction, and has very low thermal conductivity.

In addition, the main component of the cell wall is suberin, which is composed of hydrophobic poly-aliphatic and poly-aromatic substances, and has excellent material properties such as deodorization, dehumidification, and elasticity.

Currently, cork is a GRAS (generally recognized as safe) material and is used in various fields such as functional building materials such as insulation/waterproofing/interior, wine bottle caps, and materials for decoration of household goods.

Natural cork has very weak inter-particle cohesion, so in order to process it and develop it into a product, mixing chemical resins and molding it into a product is known to be a common manufacturing process. However, since natural materials can easily decompose due to microorganisms, sterilization and preservative treatment are recognized as essential manufacturing processes.

A method of increasing the usability of cork is proposed by manufacturing it with carbonized cork under high temperature and high pressure conditions. Carbonized cork is sterilized during the manufacturing process, so preservative treatment is not necessary.

Carbonized cork is manufactured in the form of granule particles through a grinding-particle size separation-dust removal process. Granule particles have a porous structure with high porosity and surface area and have a very low density. The ability of carbonized cork to adsorb organic compounds is due to the porous structural characteristics of cork and the increased activated carbon content during manufacturing at high temperature and pressure.

For this reason, carbonized cork has an excellent adsorption effect of hydrocarbons and organic compounds, which are the main components of bad odor and sick building syndrome, and can be developed into a natural deodorizing product for pillow fillers, wardrobes, shoe cabinets, refrigerators, and toilets that can be used in direct contact with consumers.

However, since the surface of carbonized cork granule particles is hydrophobic and the cohesion between particles is very low, it remains very difficult to manufacture them in various forms. In order to increase the processability of manufacturing into various structures such as plate, sphere, and cube shapes, using an adhesive can be an alternative.

Adhesives based on organic compounds have excellent adhesive properties and very high thermal stability, so they are actively used in various fields. However, because environmental hormones harmful to the human body are released, many studies are being attempted to replace them with natural raw materials. Natural adhesives can be divided into protein and polysaccharide types. The protein type includes glue, gelatin, albumin, casein, soy protein, fish glue (fish swim bladder), and the polysaccharide type includes dextrin, acid-modified starch, oxidized starch, starch derivatives, and gums ( It can be classified into gum arabic, gum karaya, gum locust, mannan, alginic acid, natural lactose, and resins (sendarac, sticklac, shellac, damar, rosin, etc.) and has excellent adhesion and thermal stability. There is.

However, protein-based and some carbohydrate-based adhesives have very high hygroscopicity, can be easily decomposed by microorganisms, and have lower relative physical properties compared to organic compound-based adhesives.

Accordingly, the present inventors sought a method to maintain the physicochemical properties of carbonized cork granule particles and increase the processing suitability, and thus arrived at the present invention.

The present invention was developed to solve the problems of the prior art as described above, and its main purpose is to establish the composition and composition ratio of an adhesive using natural materials in order to increase the processing suitability of carbonized cork, and to use this to It is intended to replace compound-based adhesives.

Another object of the present invention is to apply this adhesive to carbonized cork so that it does not harm the human body, has excellent antibacterial activity and deodorizing effect, and can be developed into various types of products, from which the physical properties such as strength, brittleness, and elasticity can be developed. The goal is to provide this significantly improved product.

The problems to be solved by the present invention are not limited to those mentioned above, and other problems to be solved that are not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the following description.

The technical object of the present invention as described above is achieved by the following means.

(1) Adhesive suspension composition for carbonized cork coating containing modified gum rosin and glycerol.

(2) In (1) above,

An adhesive suspension composition for carbonized cork coating, characterized in that it further comprises at least one member selected from the group of dextrin, starch, and ethylcellulose.

(3) In (1) above,

An adhesive suspension composition for carbonized cork coating, characterized in that modified gum rosin and glycerol are mixed in a weight ratio of 1:1 to 2:1 (w/w).

(4) Carbonized cork coated with any one of the compositions selected from (1) to (3) above.

(5) In (4) above,

The carbonized cork is a carbonized cork, characterized in that the carbonized cork is compression molded.

(6) adding modified gumrosin to ethanol and dissolving it while applying heat to obtain a first solution;

Obtaining a second solution by adding dextrin, starch, and glycerol to distilled water and applying heat;

Obtaining a third solution by dissolving ethyl cellulose in ethanol and applying heat;

mixing the first solution, the second solution, and the third solution and then using a homogenizer to obtain a homogeneous adhesive suspension solution; and

A method of manufacturing a compression molded product based on coated carbonized cork, comprising the steps of coating carbonized cork with the adhesive suspension solution and pressurizing it.

As described above, according to the present invention, the physicochemical properties of carbonized cork granule particles are maintained and the processability is increased. (1) The adhesive was manufactured using natural materials to provide adhesiveness to the carbonized cork particles, so it is environmentally friendly. It can be developed as a safe product without damage from hormones. (2) It maintains the porous cork structure and has excellent antibacterial activity and deodorizing effect due to the high activated carbon content. (3) Carbonized cork coated with natural adhesive suspension. It can be developed into various types of products using , and (4) it provides the effect of significantly improving the physical characteristics of the products manufactured from it, such as strength, brittleness, and elasticity.

Figure 1 is a manufacturing process diagram of a compression molded product using the adhesive suspension composition according to the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to be understood by those skilled in the art in the technical field to which the present invention pertains. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

In describing embodiments of the present invention, if a detailed description of a known function or configuration is judged to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. The terms described below are defined in consideration of functions in the embodiments of the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

The adhesive suspension composition for carbonized cork coating according to the present invention includes modified gum rosin and glycerol. The modified gum rosin is manufactured by reacting gum rosin, petroleum resin, polyhydric alcohol, phenol compound, and paraformaldehyde. More specifically, it is obtained by esterification reaction between a mixture containing gum rosin and petroleum resin and polyhydric alcohol. An intermediate prepared by reacting a phenol compound and paraformaldehyde can be purchased and used commercially.

Preferably, the suspension composition further includes at least one member selected from the group of dextrin, starch, and ethylcellulose.

The suspension composition according to the present invention is a mixture of modified gumrosin and glycerol in a weight ratio of 1:1 to 2:1 (w/w).

The method for producing a suspension composition according to the present invention includes the steps of (1) dissolving modified gum rosin in ethanol and applying heat to obtain a first solution; (2) adding dextrin, starch, and glycerol to distilled water and heating to obtain a second solution; (3) adding ethyl cellulose to ethanol and dissolving it while applying heat to obtain a third solution; and (4) mixing the first, second, and third solutions and then using a homogenizer to obtain a homogeneous adhesive suspension solution.

Among the above processes, preferably in step (1), the modified gumrosin is added to ethanol and stirred for 1 to 3 hours to ensure sufficient dissolution while applying heat at 25 to 35°C.

Preferably, in step (2), dextrin, starch, and glycerol are added to distilled water and stirred for 8 to 12 hours to sufficiently dissolve while applying heat at about 40 to 50°C.

Also, preferably, in step (3), ethyl cellulose is added to ethanol and stirred for 1 to 3 hours to ensure sufficient dissolution while applying heat at 30°C.

The first to third solutions prepared as above are mixed so that the final concentration is a predetermined composition ratio, and then homogenized as a suspension solution using a high-speed homogenizer (preferably 15,000 to 20,000 rpm, 1 to 10 minutes). You get

The suspension composition obtained as described above is coated on carbonized cork and manufactured into various types of molded articles.

For this purpose, the adhesive suspension is prepared by first adding carbonized cork to a known dragee and spraying the adhesive suspension composition obtained as above.

In an embodiment of the present invention, preferably, 0.1 to 2 kg of carbonized cork particles are placed in the dragee and rotated at a speed of 1 to 20 rpm. At this time, the adhesive suspension composition is sprayed using a top-spraying type using a two fluid nozzle. At this time, it is preferable that the adhesive suspension and compressed air injected are 2.0 to 3.0 ml/min and 1,500 to 2,500 kPa, respectively.

In this case, it is desirable to adjust the spray amount so that the amount of the adhesive suspension composition sprayed is uniformly sprayed at 5 to 20 ml/g (weight of carbonized cork particles). The carbonized cork onto which the adhesive suspension composition is uniformly applied is preferably placed in a cubic mold (e.g., 10×10×10 cm) and the pressure, temperature, and pressing time are set to 100 to 300 kPa, 80 to 95°C, and 1 to 10 cm, respectively. Pressure-molded coated carbonized cork is prepared by adjusting min. The compression-molded coated carbonized cork prototype prepared as described above is dried at 30-50°C for 12-36 hours and commercialized.

Hereinafter, the content of the present invention will be described in more detail with reference to examples. However, these examples are only presented to aid understanding of the present invention and should not be construed as limiting the scope of the present invention thereto.

[Example 1]

1. Experimental materials and methods

(1) Sample preparation

The carbonized cork particles were used in the experiment by grinding the carbonized cork with a grinder and adjusting the particle size to 3 × 3 × 3 cm (width × length × height) using a strainer.

(2) Preparation of natural material adhesive suspension composition

The natural adhesive suspension composition was prepared in the following manner according to the ingredient ratio in Table 1. A certain amount of modified gum rosin (Sealand Trading, Korea) was added to ethanol and stirred for 2 hours to ensure sufficient dissolution while applying heat at 30°C. A certain amount of dextrin, starch, and glycerol were added to distilled water and stirred for 10 hours to ensure sufficient dissolution while applying heat at about 40 to 50°C. Ethyl cellulose was added to ethanol and stirred for 2 hours to ensure sufficient dissolution while applying heat at 30°C. The solutions of gumrosin, dextrin, starch, and ethyl cellulose dissolved in distilled water and ethanol, respectively, were mixed so that the final concentration was the composition ratio shown in Table 1, and then used a high-speed homogenizer (17,000 rpm, 2 minutes) to form a homogeneous suspension solution. It was manufactured and used as an adhesive for the production of coated carbonized cork. Table 1 shows the ingredient ratio for manufacturing a natural adhesive suspension.

Ingredient composition ratio for manufacturing natural material adhesive suspension Sample Composition (%, w/w) Modified gum rosin glycerol dextrin starch Ethylcellulose Example 1 2 2 0 0 0 Example 2 2 2 2 0 0 Example 3 2 2 0 2 0 Example 4 2 2 0 0 2 Example 5 2 2 2 2 0 Example 6 4 2 0 0 0

(3) Coated carbonized cork manufacturing and molding

Carbonized cork coated with adhesive suspension was manufactured by placing carbonized cork in a dragee and spraying the adhesive suspension. 1 kg of carbonized cork particles were placed in the dragee and rotated at a speed of 10 rpm. At this time, the adhesive suspension was sprayed using a top-spraying type using a two fluid nozzle. The injected adhesive suspension and compressed air were 2.2 ml/min and 2,000 kPa, respectively. The amount of adhesive suspension to be sprayed was adjusted to be uniformly sprayed at 10 ml/g (weight of carbonized cork particles). The carbonized cork with the adhesive suspension uniformly applied is placed in a cubic mold (10 Cork was manufactured. The manufactured compression-molded coated carbonized cork prototype was dried at 45°C for 24 hours and used in the experiment.

2. Analysis method

(1) Evaluation of antibacterial activity and storage stability

The particle size of the carbonized cork sample coated with the adhesive suspension composition was divided into samples of uniform size of 3 × 3 × 3 cm (width × length × height) and used in the experiment. The antibacterial activity of coated carbonized cork and its effect on the growth of microorganisms during storage were confirmed using Escherichia coli and Staphylococcus aureus . First, E. coli and S. aureus were cultured for 35 and 48 hours in a liquid medium for general bacterial culture. Adjust the initial concentration of cultured E. coli and S. aureus by diluting it in 0.85% saline solution so that it ^{is 3.7} It was sprayed evenly. The storage conditions, temperature and relative humidity, were 25°C and 60%, respectively, and were measured at 24-hour intervals for 72 hours using Petri film, a selective medium for E. coli and S. aureus .

(2) Ammonia (NH ₃ ) deodorization ability evaluation

The particle size of coated carbonized cork samples was classified into sizes of 3 × 3 × 3 cm (width × length × height) and used in the experiment. The sample was placed in an acrylic container with a volume of 5 L, and the experiment was conducted after adjusting the temperature and relative humidity to 25°C and 60%, respectively. The acrylic container was sealed to completely block internal and external gases, and then the ammonia concentration was injected into the acrylic container so that the initial ammonia concentration was 100 ppm, and the change in ammonia concentration was measured every hour for 6 hours. At this time, the change in ammonia gas concentration was measured using a gas detection tube (KS l 2218:2009).

(3) Evaluation of physical properties of molded coated carbonized cork prototype

The molded coated carbonized cork prototype was placed in a cubic mold (10 × 10 × 10 cm) and manufactured into a cubic shape under the conditions of pressure, temperature, and pressing time of 200 kPa, 90°C, and 5 min, respectively. The physical properties of the molded coated carbonized cork prototype were evaluated using a texture analyzer. As for the analysis conditions of the physical property analyzer, the moving speed of the probe was 1 mm/s and the deformation ratio of the sample was 50%. Hardness, fractuurability, and elasticity were measured respectively. All experiments were repeated more than 20 times and expressed as mean and standard deviation.

3. Experiment results

(1) Evaluation of antibacterial activity and storage stability of adhesive suspension coated carbonized cork

To evaluate the antibacterial activity and storage stability of coated carbonized cork, the control group was divided into a sample without carbonized cork (blank) and a sample without coating adhesive suspension (UCC).

The initial concentrations of E. coli and S. aureus (E. coli and Staphylococcus aureus) in the control group without carbonized cork were 3.7 × 10 ⁵ and 3.2 × 10 ⁵ CFU/ml, respectively, after 72 hours of storage time. It was 6.9×10 ⁵ CFU/ml and 4.9×10 ⁵ CFU/ml, increasing in the range of 153-215%. However, the antibacterial activity of carbonized cork not coated with the adhesive suspension composition and carbonized cork coated with the adhesive suspension composition showed a similar trend, and in all experimental groups where Escherichia coli and Staphylococcus aureus were sprayed, it was confirmed that the antibacterial activity was reduced by more than 99%. In addition, it was confirmed that the antibacterial activity when the natural adhesive suspension composition was used as a coating agent was about 16% higher (Table 2: Antibacterial activity evaluation results against E. coli using adhesive suspension coated carbonized cork, Table 3: Antibacterial activity evaluation results against Staphylococcus aureus ( S. aureus ) using adhesive suspension coated carbonized cork).

¹⁾ Uncoated carbonized cork

¹⁾ Uncoated carbonized cork

(2) Ammonia (NH ₃ ) deodorization ability evaluation

To evaluate the ammonia deodorization ability of the carbonized cork coated with the adhesive suspension composition, the control group was divided into a sample to which carbonized cork was not added (blank) and a sample to which the adhesive suspension was not coated (UCC). The ammonia concentration of the blank sample used as a control ranged from 96 to 100%, and a slight decrease occurred, but it was judged that there was no significant change in ammonia concentration. However, in the carbonized cork sample (UCC) used as a control, it decreased to about 2.3 ppm after 6 hours. As a result of analyzing the ammonia concentration and deodorization ability of the carbonized cork sample coated with the adhesive suspension composition according to the present invention, the ammonia level decreased in a very similar trend to the carbonized cork used as a control. From these results, even when coated with the adhesive suspension, the carbonized cork It was confirmed that it had no effect on the deodorization ability. Therefore, it is judged that the natural materials presented in Table 1 can be sufficiently used as a carbonized cork adhesive suspension. (Table 4: NH ₃ deodorization ability evaluation results using adhesive suspension coated carbonized cork)

¹⁾ Uncoated carbonized cork

(3) Physical properties of compression-molded coated carbonized cork prototype

The physical properties of the prototype manufactured by uniformly coating the surface of carbonized cork with an adhesive suspension solution and compressing it into a cube shape under high temperature/high pressure conditions were evaluated by analyzing strength, brittleness, and elasticity, respectively. In the composition ratio of the adhesive suspension, glycerol was applied to all samples as a plasticizer to supplement the elasticity of the adhesive. When gumrojin was used alone, the elasticity was relatively very low at the level of 31 to 64% compared to other samples. From these results, although it maintained the shape of a cube, it was highly likely to break easily during external impact and use. It is judged that When dextrin, starch, and ethyl cellulose are applied, the elasticity, brittleness, and strength are significantly higher, ranging from 127.8 to 195.6%, 150.3 to 233.2%, and 155.6 to 300.0%, respectively, compared to when gumrosin is used alone. It was confirmed that there was a high level of improvement. In addition, when the amount of gum rosin added was increased from 2% to 4%, the elasticity tended to increase to about 255.6%. (Table 5: Physical property evaluation of compression-molded coated carbonized cork prototype manufactured according to the composition ratio of adhesive suspension)

4. Conclusion

Carbonized cork is a natural material with excellent antibacterial activity and deodorizing ability and can be developed into natural deodorizing products for pillow fillers, wardrobes, shoe cabinets, refrigerators, and toilets. However, because the surface of carbonized cork is hydrophobic, it is very difficult to manufacture crushed carbonized cork particles into molded products. Therefore, in this experiment, the component composition ratio of the natural adhesive suspension composition was established, and carbonized cork coated with the adhesive suspension composition was manufactured using this.

Therefore, in this experiment, conditions were applied to the high temperature/high pressure manufacturing process in order to develop various types of products using the manufactured coated carbonized cork. The antibacterial activity and deodorizing ability of carbonized cork coated with natural adhesive suspension were confirmed to be at a similar level or improved compared to the control group. In addition, the prototype of carbonized cork manufactured by the compression-molding process under high temperature/high pressure conditions showed excellent physical properties. Compared to the control group, strength was high, brittleness was relatively low, and elasticity was evaluated to be excellent.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope shall be construed as being included in the scope of rights of the present invention.

Claims (6)

delete delete delete delete delete Obtaining a first solution by adding modified gumrosin to ethanol and dissolving it while applying heat;
Obtaining a second solution by adding dextrin, starch, and glycerol to distilled water and applying heat;
Obtaining a third solution by dissolving ethyl cellulose in ethanol and applying heat;
mixing the first solution, the second solution, and the third solution and then using a homogenizer to obtain a homogeneous adhesive suspension solution; and
A method of manufacturing a compression molded product based on coated carbonized cork, comprising the steps of coating carbonized cork with the adhesive suspension solution and pressurizing it.