KR20210029617A - Organogel, xerogel comprising catechol deratives and methods for preparing the same - Google Patents

Abstract

The present invention relates to an organogel including a catechol derivative represented by chemical formula 1, Fe ion and a solvent, wherein the catechol derivative and Fe ion form a dual network, and the solvent is supported in the dual network. In chemical formula 1, R represents a substituted or non-substituted C10-C30 alkyl group, substituted or non-substituted C10-C30 alkenyl group, or a substituted or non-substituted C10-C30 alkynyl group.

Description

Organic gel, xerogel comprising catechol deratives and methods for preparing the same {Organogel, xerogel comprising catechol deratives and methods for preparing the same}

The present invention relates to an organogel, a xerogel, and a method for preparing them, and more particularly, to an organogel including a catechol derivative, a xerogel, and a method for preparing the same.

Raw lacquer or lacquer liquid collected from Rhus verniciflua, traditionally a deciduous tree belonging to the family Anacardiaceae, is used as a natural paint and varnish for everyday items such as wooden cabinets, bowls, spoons, and tables. Have been used. Lacquerware, a lacquered product, is excellent in water resistance, chemical resistance, sturdiness, flame resistance, heat resistance, antiseptic resistance, insect repellency, and insulation, and boasts strong durability that lacquerware from hundreds of years ago was still unearthed.

In general, lacquer liquid is cured by an enzyme called laccase, and at this time, conditions such as room temperature, specifically, 25° C., humidity 40% to 100%, and oxygen atmosphere are required. In this case, while drying from the surface, there is a limit that the underlying layer of the film prevents contact with air, which hinders curing, and wrinkles are likely to occur. In addition, the curing method using lacase has a problem that it takes at least one day or more and the drying speed is very slow because curing proceeds by the oxidation reaction of the enzyme.

In addition, the material has to maintain morphological stability at 40% to 100% humidity, requires a thermo-hygrostat such as lacquer, there is a limit to the thickness that can be obtained with one painting, and furthermore, sufficient color and Due to the fact that 5 to 10 coatings are required in order to obtain gloss and excellent surface properties, the curing method of lacquer using laccase has industrially low productivity and economically inefficient problems.

The problem to be solved by the present invention is to provide an organic gel containing a catechol derivative. Furthermore, it is to provide a xerogel from the obtained organic gel.

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

In order to achieve the above technical problem, an embodiment of the present invention provides an organic gel. The organic gel is a catechol derivative represented by the following formula (1), an Fe ion, and a solvent, wherein in formula (1), R is a substituted or unsubstituted C10 to C30 alkyl group, a substituted or unsubstituted C10 to It may be a C30 alkenyl group, or a substituted or unsubstituted C10 to C30 alkynyl group.

[Formula 1]

It is formed as a double network of a network structure through chemical crosslinking between the catechol derivatives or/and physical crosslinking between the catechol derivative and the Fe ion, and the solvent may be supported in the double network of the network structure. .

The chemical cross-linking bond is a covalent bond, and the physical cross-linking bond may include a coordination bond.

The catechol derivative may include urushiol, laccol, or thithiol.

The urushiol may be a linear hydrocarbon group in which R in Formula 1 is C _a H _2a+1-2b (a is 15, 16, or 17, and b is an integer of 0 to 3).

The solvent may be an organic solvent.

In addition, another embodiment of the present invention may be to provide a method for manufacturing an organic gel. The method for preparing an organic gel may include mixing a catechol derivative, an Fe ion precursor, and a solvent represented by Chemical Formula 1, and reacting the mixed solution.

The step of preparing the catechol derivative prior to the reaction step further comprises the step of preparing the catechol derivative, urushiol, laccol, or thiol ( thitsiol). This may be to heat the filtered solution under reduced pressure after putting the urushiol, the racol, or a purification solvent that dissolves the thithiol into the saengchil.

The reacting step may be to react at 20 to 50° C. for 6 hours or more.

In addition, another embodiment of the present invention is to provide a xerogel, and the xerogel may include a catechol derivative represented by Formula 1 below and an Fe ion.

Chemical crosslinking between the catechol derivatives or/and physical crosslinking between the catechol derivatives and the Fe ions to form a double network of a network structure may have a porous structure.

As described above, the organic gel containing the catechol derivative according to the embodiments of the present invention can be cured without a high temperature and high humidity environment, and is formed as a double network of a network structure, so that it has excellent mechanical strength and flexibility, and self-healing. It may have a characteristic. In addition, according to another embodiment of the present invention, a porous xerogel may be formed from the organic gel.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a schematic diagram of an organic gel having a double network according to an embodiment of the present invention.
2A is a graph showing the complex viscosity according to the molar ratio of urushiol/Fe ions of an organic gel according to Preparation Examples 1A to 4F.
2B is a graph showing the complex viscosity according to the number of moles of Fe ions in the organic gel according to Preparation Examples 1A to 4F.
2C is a graph showing the complex viscosity according to the molar concentration _{of FeCl 3} in the organic gel according to Preparation Examples 1A to 4F.
3 is a graph showing a result of measuring FT-IR (Fourier Transform of Infrared Radiation) of an organic gel according to a preparation example of the present invention.
4 is a graph showing a result of thermogravimetric analysis (TGA) of an organic gel according to a preparation example of the present invention.
5A to 5D are images obtained by measuring cross-sections of xerogels obtained from organic gels according to Preparation Examples 2B, 2C, 2D, and 2E by SEM (Scanning Eklectron Microscope), respectively.

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude the possibility of preliminary exclusion.

Unless otherwise defined, all terms including technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

In "Cx to Cy" within this specification, it is to be understood that not only x and y, but also all integers therebetween are described.

Organogel

The organic gel according to an embodiment of the present invention may include a catechol derivative represented by Formula 1 below, an Fe ion, and a solvent.

The catechol derivative may be at least one compound represented by the following formula (1).

[Formula 1]

In Formula 1, R is a substituted or unsubstituted C10 to C30 alkyl group, a substituted or unsubstituted C10 to C30 alkenyl group, or a substituted or unsubstituted C10 to C30 alkynyl group. The alkyl group, alkenyl group, and alkynyl group may be a linear alkyl group, a linear alkenyl group, and a linear alkynyl group, respectively. Specifically, R may be C15 to C18.

As an example, the catechol derivative is urushiol represented by Formula 2a, also referred to as lacquer as a major component of lacquer, laccol represented by Formula 2b, or thithiol represented by Formula 2c. Can be The sumac tree (Rhus vernicifera) growing in Korea, China, and Japan for urushiol, Rhus succedanea growing in Vietnam and Taiwan for Lacol, and Myanmar, Cambodia and Thailand (Melanorrhoea usitata) for Tichiol. Can be obtained from

[Formula 2a]

[Formula 2b]

[Formula 2c]

As an example, urushiol is _{a linear hydrocarbon group in which R is C a} H _2a+1-2b (a is 15, 16, or 17, and b is an integer of 0 to 3) in Formula 1, R among catechol derivatives It may be a mixture of these different catechol derivatives. As an example, R is (CH ₂ ) ₇ CH=CHCH ₂ CH=CHCH=CHCH ₃ , (CH ₂ ) ₇ CH=CHCH ₂ CH=CHCH ₂ CH=CH ₂ , (CH ₂ ) ₇ CH=CHCH ₂ CH =CHCH=CHCH ₃ , (CH ₂ ) ₇ CH=CHCH ₂ CH=CH(CH ₂ ) ₂ CH ₃ , (CH ₂ ) ₇ CH=CH(CH ₂ ) ₅ CH ₃ , (CH ₂ ) ₉ CH=CH It may be (CH ₂ ) 3CH ₃ , or (CH ₂ ) ₁₄ CH ₃ .

The Fe ion may be an Fe trivalent cation. Fe ions may be induced to form an organic gel having a three-dimensional network structure of a network structure by self-assembling the catechol derivative by intermolecular force.

Specifically, among Fe ions, especially Fe trivalent cations may induce oxidation reactions of catechol derivatives. Reduction of Fe trivalent cations and oxidation of catechol derivatives may occur at a similar potential of approximately 0.75V. Therefore, it may be that the Fe trivalent cation is reduced to the Fe divalent cation and at the same time induces oxidation of the catechol derivative. Accordingly, the catechol derivative may be converted to a semi-quinone radical to generate an oxygen radical. The generated radical can oxidize any one of the two hydroxy groups in the catechol derivative group to a radical through reversible mutual conversion, as well as any one of the hydroxy groups present in the chain group of the catechol derivative. It may be to form a radical by oxidizing. In conclusion, the radical may induce a polymerization reaction between the catechol derivatives to form an ether bond (-O-).

Therefore, by forming a covalent bond between the catechol derivatives as shown in Formula 3a below, the organic gel may form a double network structure having a chemical crosslink.

[Formula 3a]

In addition, the Fe ions may form a coordination bond. Fe ions, such as Fe trivalent cations and Fe divalent cations, induce coordination bonds with the catechol derivatives, thereby creating the structure of a mono-complex, bis-complex, or tris-complex. It may be to form. That is, as shown in the following Chemical Formula 3b, two hydroxy groups in the catechol group of 3 molecules of the catechol derivative and one Fe ion are 6 coordinated to form a Tris complex. In addition, as shown in the following Chemical Formula 3c, a bis complex may be formed by coordinating the hydroxy group(s) in the catechol group of the catechol derivative or the hydroxy group in the chain group of the catechol derivative in four coordination with one Fe ion. .

Accordingly, the hydroxy group of the catechol derivative forms a coordination bond, and the organic gel may form a double network structure having a physical crosslink.

[Formula 3b]

[Formula 3c]

Conventionally, in particular, lacase was mainly used for hardening of lacquer, which requires oxygen, so the lacquer dries from the surface and the inner part that does not come into contact with air is slow to react, causing wrinkles on the surface. have. Therefore, when lacase is used as a curing agent, there may be a limitation in that the thickness of the organic gel must be adjusted to a maximum of 50 μm or less. In contrast, in the case of using Fe ions as a curing agent for lacquer, as in the present invention, there may be no restrictions on the thickness of the organic gel.

The solvent is supported in the organic gel having a double network obtained according to the above, and may be an organic solvent, and specifically, may be a polar aprotic solvent, a polar protic solvent, or a non-polar solvent. As an example, the polar aprotic solvent is acetone, dimethyl sulfoxide (DMSO), dimethylformamide (DMF), N-methyl-2-pyrrolidone (N-methyl- 2-pyrrolidone, NMP), gamma-butyrolactone (GBL), and the like. The polar protic solvent may be an alcohol such as ethanol. The non-polar solvent may be xylene, turpentine, or the like. However, it is not limited thereto.

1 is a schematic diagram of an organic gel having a double network according to an embodiment of the present invention.

Referring to FIG. 1, the organic gel according to an embodiment of the present invention may be formed as a double network having a network structure.

The organic gel may have a chemical crosslink by forming a covalent bond between the catechol derivatives. Chemical cross-linking may mean a bond that is not easily broken by connecting polymer chains through covalent bonds. As covalent bonds are formed, a strong bond between polymer chains may be formed, and thus chemical cross-linking may improve durability and physical properties of the polymer.

In addition, the organic gel may have a physical crosslink by forming a coordination bond between the catechol derivative and the Fe ion. Physical cross-linking may mean a reversible bond by force between atoms (or functional groups), not covalent bonds, and may include, for example, coordination bonds, π-π interactions, and the like. Such physical cross-linking may increase the flexibility of the polymer material, and since it enables reversible bond formation, it may be spontaneously re-formed even after the bond is destroyed due to external factors, thereby providing self-healing properties.

Furthermore, the organic gel may have a double network of a network structure through physical crosslinking as well as chemical crosslinking by forming covalent bonds between catechol derivatives and coordination bonds between catechol derivatives and Fe ions.

That is, the organic gel according to the present invention may have a double network structure, and thus has a robust property by chemical cross-linking and exhibits excellent mechanical strength, while securing flexibility and self-healing properties through physical cross-linking. However, when the network is formed, the density or structure of the organic gel obtained according to the bonding path may vary.

In particular, the polymer formed through curing of lacquer liquid has excellent chemical resistance, high stiffness, salt resistance and heat resistance to chemicals such as basicity, acidity or salt, so that organic gels using lacquer can have particularly strong durability.

Therefore, the organic gel manufactured by using this and having a double network structure has a considerably excellent mechanical strength and can exhibit flexibility at the same time, and thus can be usefully used for joints of robots that require high breakdown energy.

In addition, since the catechol derivative has a catechol group, it may have excellent adhesion properties. Therefore, it is also possible to impart adhesive properties by coating with the organic gel according to the present invention.

The organic gel may be prepared by mixing a catechol derivative, an Fe ion precursor, and a solvent. In detail, by dissolving an Fe ion precursor in a solvent and mixing it with a catechol derivative, as described above, a double network structure having a network structure may be formed. At the same time, an organic gel in which the solvent is supported may be formed in the double network structure.

The mixed solution may be one to perform a gelation reaction at a reaction temperature of 20 to 50°C. Specifically, the reaction temperature may be 25 to 40°C, or 25 to 35°C, and preferably 30°C. In this case, it may be to react at the reaction temperature for at least 6 hours or more.

The solvent is not particularly limited as long as it can form a gel from the catechol derivative, and may be an organic solvent. The organic solvent may be a polar aprotic solvent, a polar protic solvent, a non-polar solvent, or a mixture thereof. As an example, the polar aprotic solvent is acetone, dimethyl sulfoxide (DMSO), dimethylformamide (DMF), N-methyl-2-pyrrolidone (N-methyl- 2-pyrrolidone, NMP), gamma-butyrolactone (GBL), and the like. The polar protic solvent may be an alcohol such as ethanol. The non-polar solvent may be xylene, turpentine, or the like. However, it is not limited thereto. In particular, a polar aprotic solvent may be used as the solvent, and preferably, acetone may be used.

In addition, prior to the step of reacting, the step of preparing a catechol derivative may be further included. When the catechol derivative is lacquer, that is, urushiol, racol, or thithiol, the catechol derivative may be separated from the lacquer liquid and put into a purified one.

The lacquer solution is a sap (called saengchil) obtained by scratching the lacquer tree, and may be an emulsion solution containing urushiol, lacol, or thithiol as a main component. Specifically, it may be a mixture consisting of urushiol, glycoprotein, sugar water, and the like. It does not matter whether the saengchil is produced in any country, such as Korea, China, Japan, or Southeast Asian countries.

Obtained by separating only purified urushiol, laccol or thithiol from lacquer liquid is a method of heating the filtered solution under reduced pressure after adding a purified solvent that dissolves urushiol, racol or thithiol in fresh chil. It may be to use. That is, after removing impurities and precipitates obtained through filtration and phase separation, and obtaining a solution in which urushiol, racol, or thithiol is dissolved, it may be heated under reduced pressure at a temperature of 40°C to 80°C.

The purified solvent is not significantly limited as long as it can dissolve lacquer, and may be an organic solvent. For example, it may be acetone, xylene, or turpentine.

That is, in forming an organic gel, a method of further including a separate solvent after the step of purifying the catechol derivative from the lacquer solution, rather than using a mixture containing urushiol, water, etc., which are sap extracted from lacquer. It may be to use. In other words, the organic gel in which the solvent is supported in the double network may be formed according to the present invention by further including a solvent instead of using the liquid extracted from poison ivy.

The Fe ion precursor may be used without limitation as long as it provides Fe in the form of a trivalent cation. In particular, the Fe ion precursor may be an Fe salt, and in this case, the anion, which is a counter ion in the Fe salt, can ionically bond with the Fe ion to keep the organic gel neutral. The Fe salt may be, for example, a FeCl ₃ solution.

In particular, lacquer has the specificity of curing in a high temperature and high humidity environment. In particular, when using lacase as a curing agent as in the prior art, a humidity condition of 40 to 100% is required, and the curing reaction proceeds in a thermo-hygrostat during manufacture. Should be done. Therefore, there is a problem that it is difficult to increase productivity through a continuous process because it proceeds as a batch reaction. Furthermore, it proceeds to an oxidation reaction by an enzyme, and there may be a problem that productivity is lowered economically and industrially. On the other hand, as in the present invention, when using Fe ions as a curing agent for lacquer, there may be no restrictions on the reaction conditions.

Xerogel

The xerogel according to an embodiment of the present invention may be obtained from the organic gel.

The xerogel contains a catechol derivative and Fe ions represented by the following Formula 1, and as shown in FIG. 1, chemical cross-linking between catechol derivatives and physical cross-linking of catechol derivatives and Fe ions By forming a double network of a network structure, it may have a porous structure.

[Formula 1]

In Formula 1, R is a substituted or unsubstituted C10 to C30 alkyl group, a substituted or unsubstituted C10 to C30 alkenyl group, or a substituted or unsubstituted C10 to C30 alkynyl group.

This may be obtained by removing the solvent from the organic gel. That is, xerogel is obtained by removing the solvent supported in the double network of the network structure from the organic gel using methods such as freeze drying, vacuum drying, heat drying, precipitation using a non-solvent, and supercritical fluid extraction. I can. The method of removing the solvent is not limited to the above method.

On the other hand, in the case of using lacquer, that is, urushiol, lacol, or thithiol as the catechol derivative, as described above, in order to form the organic gel according to the present invention, the catechol derivative is a sap extracted from the lacquer tree, in the form of a lacquer solution. It is not added, but is purified from lacquer liquid, and can be added in the form of a concentrate.

That is, it may be to obtain a xerogel having a porous structure by removing the solvent again from the organic gel formed by using the purified catechol derivative and further including a separate solvent.

Therefore, in order to manufacture a xerogel having a porous structure, the solvent must be easily removed. In this case, when the catechol derivative is added in the form of lacquer liquid extracted from lacquer, the organic gel may collect about 30% of moisture. In this case, it may be somewhat difficult to remove water from the organic gel in which moisture is collected. On the other hand, in the present invention, since the solvent can be somewhat easily removed from the organic gel in which the organic solvent is collected by adding a separate solvent, a xerogel having a large surface area as a porous structure can be easily provided.

Hereinafter, a preferred experimental example is presented to aid in understanding of the present invention. However, the following experimental examples are only intended to aid understanding of the present invention, and the present invention is not limited by the following experimental examples.

[Experimental examples; Examples]

<Organic gel preparation example>

Saengchil and acetone were added in a weight ratio of 1:5 and stirred for 30 minutes to dissolve in acetone to obtain a saengchil/acetone solution separated into a water layer contained in saengchil and an acetone solution layer in which urushiol was dissolved. Impurities and precipitates were removed from the saengchil/acetone solution using a separatory funnel to obtain an acetone solution layer. After filtering the obtained acetone solution layer, the acetone was removed by heating under reduced pressure at 68°C to obtain purified urushiol.

_{After dissolving FeCl 3} in acetone solvent and mixing the purified urushiol obtained from the above, it was reacted in an oven at 30° C. until a gel was formed.

Rheology property

The rheological properties of the organic gel according to Preparation Example were measured using an MCR302 rotary rheometer. It was measured under conditions of 25°C and 10 rad/s frequency.

Table 1 shows the complex viscosity and shear modulus of an organic gel with a weight ratio of urushiol:acetone of 50:50 (0.5 g of urushiol).

[Table 1]

Table 2 shows the measurement of the complex viscosity and shear modulus of an organic gel with a weight ratio of urushiol:acetone of 60:40 (0.5 g of urushiol).

[Table 2]

Table 3 shows the measurement of the complex viscosity and shear modulus of an organic gel in which the weight ratio of urushiol:acetone is 70:30 (0.5 g of urushiol).

[Table 3]

Table 4 shows the measurement of the complex viscosity and shear modulus of an organic gel having a weight ratio of urushiol:acetone of 80:20 (0.5 g of urushiol).

[Table 4]

As shown in Tables 1 to 4, when the solute weight ratio and the molar ratio of urushiol to iron satisfy a specific value, it may be formed as an organic gel.

2A is a graph showing the complex viscosity according to the molar ratio of urushiol/Fe ions of an organic gel according to Preparation Examples 1A to 4F.

Each graph corresponds to the case where the weight ratio of the urushiol solute and acetone solvent is 50:50, 60:40, 70:30 and 80:20. In addition, the dots of each graph correspond to an organic gel prepared using 3.5M, 3M, 2.5M, 2M, 1.5M and 1M FeCl _{3 solutions from the left.}

Tables 1 to 4 and FIG. 2A show that the ratio of covalent bonds between urushiol formed in the organic gel and the ratio of coordination bonds between urushiol and Fe ions vary according to the weight ratio of urushiol and acetone and the molar ratio of urushiol and Fe ions. , It may indicate that the above two variables, that is, the weight ratio of urushiol and acetone, and the molar ratio of urushiol and Fe ions, determine the characteristics of the organic gel.

That is, the organic gel according to the present invention may mean that a chemical crosslink is formed and at the same time has a double network structure by physical crosslinking.

FIG. 2B is a graph showing the complex viscosity according to the number of moles of Fe ions in the organic gel according to Preparation Examples 1A to 4F, and in detail, the moles of Fe ions contained in _{FeCl 3 injected when forming the organic gel} It is a measure of viscosity according to the number. 2C is a graph showing the complex viscosity according to the molar concentration _{of FeCl 3} in the organic gel according to Preparation Examples 1A to 4F.

2C, when the weight ratio of urushiol and acetone is 50:50 to 80:20 and _{the molar concentration of FeCl 3} is 1.5M to 3.5M, in particular, the weight ratio of urushiol and acetone is 60:40 and the mole of _{FeCl 3} When the concentration is 2.5M, it can be seen that the organic gel according to the present invention has high mechanical strength.

This can be confirmed through the fact that the weight ratio of urushiol and acetone is in the same range as above, and has a much better viscosity than when the molar concentration of _{FeCl 3 is 1M.} On the other hand, when the weight ratio of urushiol and acetone is in the same range as above, and _{the molar concentration of FeCl 3} is 4M or more, Fe ions are not sufficiently dissolved and thus organic gel may not be formed.

That is, when the above range is satisfied, chemical crosslinking and physical crosslinking are formed, and by controlling the induction of oxidation reaction of the catechol derivative under Fe ions as the physical crosslinking bond is formed, the organic gel exhibits excellent physical properties. Can be.

Spectroscopic properties

3 is a graph showing a result of measuring FT-IR　 (Fourier Transform of Infrared Radiation) of an organic gel according to a preparation example of the present invention. In detail, the FT-IR spectrum from Day 1 to Day 11 was measured after urushiol and organogel formation reaction was performed.

Referring to FIG. 3, it is difficult to find in purified pure urushiol, but after day 2, more precisely, after day 3, a peak can be found at ^{1214 cm -1, which does not appear in pure urushiol.} The newly appearing peak corresponds to an aromatic ether, and the organic gel is thought to be a result of the formation of a radical polymerization reaction by ether bonds between urushiols.

In addition, the 1700 cm ^-1 peak may be caused by a quinone not coordinating with Fe ions, and the 1652 cm ^{-1 peak may be caused by a quinone coordinating with Fe ions.}

Thermogravimetric analysis

4 is a graph showing a result of thermogravimetric analysis (TGA) of an organic gel according to a preparation example of the present invention. Specifically, it was measured at a temperature of 30 to 900°C at a temperature increase rate of 20°C/min and a nitrogen gas flow rate of 20 mL/min.

Referring to FIG. 4, the organic gel according to the present invention exhibits thermal decomposition at approximately 300° C., and shows the most change at approximately 450° C., thereby confirming thermal stability.

<Xerogel production example>

The organic gel obtained above was freeze-dried for 3 days at -90°C and vacuum conditions to remove the solvent contained in the organic gel.

SEM analysis

5A to 5D are images obtained by measuring cross-sections of xerogels obtained from organic gels according to Preparation Examples 2B, 2C, 2D, and 2E by SEM (Scanning Electron Microscope), respectively.

Referring to FIG. 5, it can be seen that the xerogel according to the present invention has a porosity, and has a different porosity according to the synthesis conditions of the organic gel.

Therefore, by controlling the porosity by varying the synthesis conditions of the organic gel, it may be possible to use a wide range of xerogels.

Porosity Analysis

Table 5 shows the porosity of the xerogels obtained from organic gels 2B, 2C, and 2E according to the preparation example. Porosity was measured by adsorbing mercury on a sample sampled at 3 mm using a mercury porosity meter (PM33GT).

[Table 5]

Referring to Table 5, the total porosity of the xerogel according to the above is 50% or more, and the total surface area is 10 m ² /g or more, compared to the existing polyurethane foam. It can be seen that has a high value.

Although described with reference to the above embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention described in the following claims. I will be able to.

Claims (15)

An organic gel containing a catechol derivative represented by the following formula (1), an Fe ion, and a solvent:
[Formula 1]

In Formula 1, R is a substituted or unsubstituted C10 to C30 alkyl group, a substituted or unsubstituted C10 to C30 alkenyl group, or a substituted or unsubstituted C10 to C30 alkynyl group. The method according to claim 1,
It is formed as a double network of a network structure through chemical crosslinking between the catechol derivatives or physical crosslinking between the catechol derivatives and the Fe ions,
The organic gel in which the solvent is supported in the double network of the network structure. The method according to claim 1,
It is formed as a double network of a network structure through chemical crosslinking between the catechol derivatives and physical crosslinking between the catechol derivative and the Fe ion,
The organic gel in which the solvent is supported in the double network of the network structure. The method according to claim 1,
The chemical crosslinking bond is a covalent bond, and the physical crosslinking bond includes a coordination bond. The method according to claim 1,
The catechol derivative is an organic gel containing urushiol, laccol or thithiol. The method of claim 5,
The urushiol is a linear hydrocarbon group in which R in Formula 1 is C _a H _2a+1-2b (a is 15, 16, or 17, and b is an integer of 0 to 3), an organic gel. The method according to claim 1,
The solvent is an organic solvent, an organic gel. A method for preparing an organic gel comprising the step of reacting the mixed solution by mixing a catechol derivative represented by the following Formula 1, an Fe ion precursor, and a solvent:
[Formula 1]

In Formula 1, R is a substituted or unsubstituted C10 to C30 alkyl group, a substituted or unsubstituted C10 to C30 alkenyl group, or a substituted or unsubstituted C10 to C30 alkynyl group. The method of claim 8,
Prior to the step of reacting, further comprising preparing the catechol derivative,
The step of preparing the catechol derivative is to obtain purified urushiol, laccol, or thithiol in the form of a concentrated solution by separating from the lacquer liquid. The method of claim 9,
Obtaining in the form of the concentrate is to heat the filtered solution under reduced pressure after adding the urushiol, the racol, or a purification solvent that dissolves the thithiol in saengchil. The method of claim 8,
The step of reacting is to react at 20 to 50° C. for 6 hours or more. The method of claim 8,
The solvent is an organic solvent, an organic gel manufacturing method. A xerogel containing a catechol derivative and Fe ions represented by the following formula (1):
[Formula 1]

In Formula 1, R is a substituted or unsubstituted C10 to C30 alkyl group, a substituted or unsubstituted C10 to C30 alkenyl group, or a substituted or unsubstituted C10 to C30 alkynyl group. The method of claim 13,
Forming a chemical crosslinking bond between the catechol derivatives or a physical crosslinking bond between the catechol derivatives and the Fe ions to form a double network of a network structure, which has a porous structure. The method of claim 13,
Chemical crosslinking between the catechol derivatives and physical crosslinking between the catechol derivatives and the Fe ions to form a double network of a network structure, which has a porous structure.

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