KR102563318B1 - Synthesis of high hydrophobic silica particle and preparation method of non-stick paste using thereof - Google Patents

Abstract

According to one embodiment of the present invention, a spherical skeleton composed of alternating bonds of silicon atoms and oxygen atoms is included, and at least one of the silicon atoms constituting the spherical skeleton has a group represented by Formula 1 are combined, and R ¹ , R ² and R ³ in Formula 1 are each independently a C1 to C5 hydrocarbon compound, superhydrophobic nano silica particles are provided.

Description

Synthesis of super-hydrophobic nano silica particles and method of manufacturing non-stick paint using the same

The present invention relates to a method for synthesizing super-hydrophobic nano silica particles in a non-stick paint that can be used for kitchen utensils and the like.

Ceramic coating is a high-hardness fine ceramic with strong corrosion resistance, heat resistance and abrasion resistance, which forms an inorganic coating film on the surface of the product. The characteristics of this ceramic coating are that it can be cured at a low temperature of 150 ~ 250 ℃, and it is compatible with wood, glass, metal and plastic. It can be applied to various coating base materials such as

Industrial fields that apply these characteristics of ceramic coating include heat-resistant devices, industrial materials such as electronics and semiconductors, building interior and exterior materials, and kitchen utensils. Due to the demand, ceramic coatings with excellent heat resistance, durability, and corrosion resistance are applied, and the introduction of a non-stick function that prevents food from sticking to these ceramic coatings has been researched and developed and applied.

A typical ceramic coating paint forms a coating layer through a sol-gel reaction of water-based colloidal silica having a hydrophilic particle surface with organosilane. The paint is manufactured by physically mixing, but the non-stick performance of silicone oil tends to rapidly decrease due to separation and decomposition due to external stimuli, resulting in a short lifespan of the coating.

In order to overcome this, research is being conducted in various directions, such as changing the substituent of silicone oil, improving the durability of silicone oil according to viscosity, or modifying the surface of colloidal silica having different particle sizes with organosilane and mixing it. Since the miscibility between water used as the main solvent of ceramic coating and silicone oil is low, there are limitations in this method due to non-uniformity in non-stick performance and difficulty in redispersing silicone oil, and reactive colloids of a certain size or more In modifying the surface of silica with organosilane, surface modification is limited because it is impossible to control the bonding between silica particles or the bonding between organosilanes.

Therefore, there is a need for a ceramic coating that is improved over conventional ceramic coatings and has excellent durability.

An object of the present invention is to provide a nonstick paint having excellent durability that can withstand harsh conditions such as physical impact and heating.

According to an embodiment of the present invention, a spherical skeleton composed of alternating bonds of silicon atoms and oxygen atoms is included, and at least one of the silicon atoms constituting the spherical skeleton has the following formula (1) A group is bonded, and R ¹ , R ² and R ³ in Formula 1 are each independently a C1 to C5 hydrocarbon compound, and a non-stick paint is provided.

[Formula 1]

According to one embodiment of the present invention, the spherical skeleton composed of alternating bonds of silicon atoms and oxygen atoms is a compound of Formula 2 below, in which Si ^a , Si ^b , Si ^c , Si ^d and Si ^e is independently bonded to the group of Formula 1, and R ¹ , R ² and R ³ in the compound of Formula 1 bonded to each of Si ^a , Si ^b , Si ^c , Si ^d and Si ^e in Formula 2 are The same or different non-stick paints are provided.

[Formula 2]

According to one embodiment of the present invention, a non-stick paint containing a compound represented by Formula 3 is provided.

[Formula 3]

In Formula 3, R ¹ to R ¹⁸ are each independently a methyl group (Methyl) or an ethyl group (Ethyl).

According to one embodiment of the present invention, a first step of hydrolyzing tetramethyl orthosilicate (Tetramehtylorthosilicate) in monomeric form; and a second step of synthesizing a hydrophobic compound including a spherical skeleton composed of alternating silicon atoms and oxygen atoms by condensation polymerization of hydrolyzed tetramethylorthosilicate. Synthesized, Superhydrophobic nano silica particles are provided.

According to one embodiment of the present invention, a first step of hydrolyzing tetramethyl orthosilicate (Tetramehtylorthosilicate) in monomeric form; and a second step of synthesizing a hydrophobic compound including a spherical skeleton composed of alternating silicon and oxygen atoms by condensation polymerization of hydrolyzed tetramethylorthosilicate, In the first step and the second step, at least one compound selected from the group consisting of alkyl silane, alkoxy silane, and silazne is added during hydrolysis and condensation polymerization, respectively. A method for synthesizing superhydrophobic nano silica particles is provided.

According to one embodiment of the present invention, trimethylchlorosilane is added in the first step to promote the hydrolysis reaction of tetramethylorthosilicate in an acidic atmosphere without the addition of other acidic compounds, super-hydrophobic nano silica A particle synthesis method is provided.

According to one embodiment of the present invention, in the second step, hexamethyldisilazane is added to promote the condensation polymerization reaction of tetramethylorthosilicate hydrolyzed in a basic state, and at the same time, the spherical shape A method for synthesizing superhydrophobic nano-silica particles in which a methyl group is introduced on a skeleton is provided.

According to one embodiment of the present invention, there is provided a method for synthesizing superhydrophobic nano silica particles, in which an alcohol solvent is further added to control the rate of condensation polymerization of tetramethylorthosilicate hydrolyzed in the second step.

According to one embodiment of the present invention, in the second step, methyltrimethoxysilane is further added to modify the hydroxyl group provided on the surface of the spherical skeleton to a methyl group, a method for synthesizing superhydrophobic nano silica particles is provided.

According to one embodiment of the present invention, the hydrophobic compound synthesized after performing the second step includes a spherical skeleton composed of alternating bonds of silicon atoms and oxygen atoms, and constitutes the spherical skeleton. A group of formula 1 is bonded to at least one of the silicon atoms, and in formula 1, R ¹ , R ² and R ³ are each independently a C1 to C5 hydrocarbon compound, a method for synthesizing superhydrophobic nano silica particles is provided .

According to the present invention, physical impact, heating, etc. It is possible to provide super-hydrophobic nano-silica particles that do not lose their hydrophobicity even under harsh conditions and a non-stick paint containing the same.

1 is a flowchart illustrating a method for synthesizing a non-stick paint according to an embodiment of the present invention.
2 is a block diagram showing a mixing sequence of reactants in a method for synthesizing a non-stick paint according to an embodiment of the present invention.
3a and 3b are reaction structural formulas showing some of the reactions occurring in the nonstick paint synthesis method according to an embodiment of the present invention.
4 is TEM analysis data of the hydrophobic TMOS precursor and superhydrophobic TMOS particles prepared according to Example 1.
5 is a result of FT-IR analysis of superhydrophobic silica particles, TMOS, and a hydrophobic precursor prepared according to Example 1.
Figure 6 is an image of the dispersion stability according to the reaction time between the preparation of the hydrophobic TMOS precursor according to Example 3.
7 is TEM analysis data for partial aggregation according to pH control in the formation of superhydrophobic TMOS particles according to Example 3.
8 is a photograph of a comparison of contact angles between a general ceramic coating according to Example 4 and a ceramic coating in which a hydrophobic TMOS precursor and superhydrophobic TMOS particles are introduced.

Since the present invention may have various changes and various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, it should be understood that this is not intended to limit the present invention to the specific disclosed form, and includes all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Like reference numerals have been used for like elements throughout the description of each figure. In the accompanying drawings, the dimensions of the structures are shown enlarged than actual for clarity of the present invention. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof. In addition, when a part such as a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where it is "directly on" the other part, but also the case where another part is present in the middle. In addition, in this specification, when it is said that a part such as a layer, film, region, plate, etc. is formed on another part, the formed direction is not limited to the upper direction, but includes those formed in the lateral or lower direction. . Conversely, when a part such as a layer, film, region, plate, etc. is said to be "under" another part, this includes not only the case where it is "directly below" the other part, but also the case where another part exists in the middle.

In this specification, 'upper surface' and 'lower surface' are used as relative concepts in order to easily understand the technical concept of the present invention. Therefore, 'upper surface' and 'lower surface' do not refer to specific directions, locations or components, but may be interchanged with each other. For example, 'upper surface' may be interpreted as 'lower surface', and 'lower surface' may be interpreted as 'upper surface'. Accordingly, the 'top surface' may be expressed as 'first' and the 'bottom surface' may be expressed as 'second', or the 'bottom surface' may be expressed as 'first' and the 'upper surface' may be expressed as 'second'. However, in one embodiment, 'upper surface' and 'lower surface' are not used interchangeably.

According to an embodiment of the present invention, in providing a ceramic coating, the particles constituting the ceramic coating are synthesized to have strong hydrophobicity without a hydrophobic additive such as PDMS oil, so that the nonstick properties can be maintained even when high temperature and external impact are applied. let it be

1 is a flowchart illustrating a method for synthesizing a non-stick paint according to an embodiment of the present invention. 2 is a block diagram showing a mixing sequence of reactants in a method for synthesizing a non-stick paint according to an embodiment of the present invention.

Referring to FIGS. 1 and 2 , a first step (S100) of hydrolyzing monomeric tetramethylorthosilicate (Tetramehtylorthosilicate; TMOS); and a second step (S200) of synthesizing a hydrophobic compound including a spherical skeleton composed of alternating silicon atoms and oxygen atoms by condensation polymerization of hydrolyzed tetramethylorthosilicate (S200). And, in the first step (S100) and the second step (S200), in the group consisting of alkyl silane, alkoxy silane, and silazne during hydrolysis and condensation polymerization, respectively A method for synthesizing a nonstick paint, in which at least one selected compound is added, is provided.

Looking in detail at each step of the non-stick paint synthesis method, in the first step (S100), monomeric tetramethylorthosilicate (Tetramehtylorthosilicate) is hydrolyzed. As a result of hydrolysis of tetramethylorthosilicate, a hydrophobic precursor may be provided in the form of a sol. The hydrophobic precursor in the form of a sol provided by hydrolysis in the first step (S100) may include at least one or more siloxane compounds, as can be seen in the figure.

In the first step (S100), the hydrolysis reaction may be performed in an acidic atmosphere. As hydrolysis of tetramethylorthosilicate is carried out in an acidic atmosphere, hydrolysis can be promoted. If the hydrolysis reaction time is excessively long, hydrophobic precursors formed by hydrolysis of tetramethylorthosilicate may aggregate and gelation of the solution may occur. In this case, it is difficult to form superhydrophobic silica particles with a desired size. For example, the size of superhydrophobic silica particles may be excessively increased due to aggregation of the hydrophobic precursor, and in this case, it may be difficult to utilize the synthesized hydrophobic precursor as a nonstick paint.

In the first step (S100), at least one compound selected from the group consisting of alkyl silane, alkoxy silane, and silazne may be added to carry out a hydrolysis reaction in an acidic atmosphere. there is. In some cases, the compound added in the first step (S100) may be trimethylchlorosilane (TMSC). By adding trimethylchlorosilane, a hydrolysis reaction can be performed without adding another acidic compound in the first step (S100). For example, hydrolysis using trimethylchlorosilane and tetramethylorthosilicate without adding formic acid, acetic acid, hydrochloric acid, etc., which are commonly used acid catalysts for hydrolysis reactions reaction can be performed.

By using trimethylchlorosilane to create an acidic atmosphere in the first step (S100), it is possible to suppress the aggregation reaction between hydrophobic precursors generated by the decomposition of tetramethylorthosilicate and maintain a stable sol state. Specifically, trimethylchlorosilane reacts with a solvent in a reaction solution to be divided into hydrochloric acid (HCl) and trimethylsilyl ((CH ₃ ) ₃ -Si-). Hydrochloric acid promotes a hydrolysis reaction as an acidic catalyst, and trimethylsilyl ((CH ₃ ) ₃ -Si-) groups may be bonded to tetramethylorthosilicate to impart hydrophobicity to the surface of the hydrophobic precursor. Accordingly, it is possible to prevent the hydrophobic precursors from reacting with each other and aggregating, and the sol state can be maintained after hydrolysis in the first step (S100).

In the first step (S100), water may be further added to perform a hydrolysis reaction. It may be added in a range of 4 moles or less per mole of the hydrophobic precursor mixture. By adding a relatively small amount of water as described above, it is possible to prevent gelation from occurring in the hydrolysis reaction.

Since tetramethylorthosilicate decomposed in the first step (S100) has high reactivity, it is difficult to maintain the stability of hydrophobic precursors produced as a result of hydrolysis. Therefore, by using trimethylchlorosilane in the first step (S100), hydrolysis can be accelerated and stability of the hydrolyzed hydrophobic precursor can be maintained.

Next, a second step (S200) of performing a condensation polymerization reaction on the hydrophobic precursors produced by hydrolysis of tetramethylorthosilicate is performed.

In the second step (S200), a hydrophobic compound including a spherical skeleton composed of alternating silicon atoms and oxygen atoms is synthesized by condensation polymerization of hydrolyzed tetramethylorthosilicate.

The second step (S200) may be performed in a basic atmosphere. Hydrophobic precursors hydrolyzed in a basic atmosphere may undergo condensation polymerization, and thus a hydrophobic compound having a spherical skeleton may be synthesized.

The hydrophobic compound having a spherical skeleton synthesized in the second step (S200) exhibits hydrophobicity itself because the skeleton of the compound is composed of alternating bonds of silicon atoms and oxygen atoms. In addition, hydrophobic functional groups may be bound to the surface of the hydrophobic compound, for which at least one compound selected from the group consisting of alkyl silane, alkoxy silane, and silazne may be added. .

The compound added in the second step (S200) may be hexamethyldisilazane (HMDS) in some cases. Hexamethyldisilazane can promote the condensation reaction by creating a basic atmosphere. In addition, hexamethyldisilazane may react on the surface of the hydrophobic compound particle to provide a trimethylsilyl group on the surface of the hydrophobic compound particle (spherical framework). Due to the introduction of the trimethylsilyl group, the hydrophobicity of the hydrophobic compound particle having a spherical framework may be increased. In addition, since the trimethylsilyl group is provided as a covalent bond on the spherical skeleton, it is not decomposed and separated by heating or physical impact. Therefore, the non-stick property of the coating provided using the hydrophobic compound can be maintained for a long time.

When adding hexamethyldisilazane in the second step (S200), hexamethyldisilazane may be added after being diluted in an alcohol solvent. For example, hexamethyldisilazane may be diluted in isopropylalcohol (IPA) and added into the hydrophobic precursor solution. Accordingly, it is possible to prevent rapid pH change and local aggregation due to mixing of hexamethyldisilazane. Hexamethyldisilazane may be diluted in isopropyl alcohol and added in a diluted state to 0.4 wt% to 0.8 wt% .

The second step (S200) may be performed in a sol state. By using the sol-gel synthesis method in the first step (S100) and the second step (S200), the size and shape of the synthesized superhydrophobic silica particles can be effectively controlled.

In performing the second step (S200), methyltrimethoxysilane (MTMS) may be further added. Methyltrimethoxysilane reacts with hydroxyl groups that may exist on the surface of the spherical framework to modify them into hydrophobic groups such as methoxy groups.

An alcohol solvent may be further provided in the second step (S200). The alcohol solvent may be isopropylalcohol (IPA) in some cases. The alcohol solvent serves to control the polymerization reaction rate in the second step (S200). In the case of the present invention, water is added in the first step, the hydrolysis step (mixing with TMCS), and a relatively small amount of water (eg, 4 moles or less) may be added. When the amount of water added in the first step (S100) is increased, an unwanted condensation polymerization reaction rate increases in the first step (S100), and a gelation phenomenon may occur. Therefore, the gelation phenomenon as described above can be prevented by adding 4 mol or less of water in the first step and mixing and adding IPA and HMDS in the second step of condensation polymerization.

3a and 3b are reaction structural formulas showing some of the reactions occurring in the nonstick paint synthesis method according to an embodiment of the present invention.

Figure 3a shows the first step reaction described above, and it can be seen that tetramethylorthosilicate (TMOS) and trimethylchlorosilane (TMSC) are hydrolyzed to produce a hydrophobic precursor compound. As can be seen in the figure, the hydrophobic precursor compound may include at least one or more siloxane compounds.

Next, referring to FIG. 3B , it can be confirmed that the hydrophobic precursor compound undergoes condensation polymerization with hexamethyldisilazane (HMDS) and methyltrimethoxysilane (MTMS), and thus hydrophobic compound particles are synthesized.

The synthesized hydrophobic compound particle includes a spherical skeleton composed of alternating bonds of silicon atoms and oxygen atoms, and at least one of the silicon atoms constituting the spherical skeleton has a group represented by Formula 1 bonded thereto. And, in Formula 1, R ¹ , R ² and R ³ may each independently be a C1 to C5 hydrocarbon compound.

[Formula 1]

Such a compound has a skeleton composed of silicon atoms and oxygen atoms, and thus has excellent durability like silica, and exhibits hydrophobicity itself. In addition, the hydrophobic group represented by Chemical Formula 1 is provided on the surface, so that the hydrophobic property is great. In particular, since the hydrophobic group of Chemical Formula 1 is covalently bonded to the surface of the spherical skeleton, it is not decomposed even at a high temperature in a cooking utensil. Therefore, even if a product provided with a coating is used at a high temperature, there is no fear that the coating is decomposed and the hydrophobicity is deteriorated.

In some cases, the spherical framework provided to the above-described hydrophobic compound particles may be represented by Formula 2 below.

[Formula 2]

In Formula 2, Si ^a , Si ^b , Si ^c , Si ^d and Si ^e are each independently bonded to the group represented by Formula 1, and each of Si ^a , Si ^b , S ^c , Si ^d and Si ^e in Formula 2 In the compound of Formula 1 bonded to R ¹ , R ² and R ³ may be the same as or different from each other.

In addition, in some cases, the superhydrophobic silica particles including the skeleton according to Formula 2 may have a form shown in Formula 3 below.

[Formula 3]

In Formula 3, R ¹ to R ¹⁸ are each independently a methyl group (Methyl) or an ethyl group (Ethyl).

As described above, the spherical particles of the compound itself exhibit hydrophobicity, and a large number of alkyl silane groups are provided on the surface to exhibit excellent hydrophobicity. In addition, since an alkyl silane group providing hydrophobicity is covalently bonded to the particles, thermal stability is also excellent.

The superhydrophobic silica particles having the structures of Formulas 1 to 3 described above may be dispersed in an alcohol solvent and provided in the form of a paint. The paint may be coated on kitchen utensils and the like, thereby providing a non-stick coating in which food does not stick.

In the above, the non-stick paint and the non-stick paint manufacturing method according to an embodiment of the present invention have been looked at. Hereinafter, the results of analyzing the characteristics of the non-stick paint according to the experimental example will be reviewed.

Example 1. Preparation of superhydrophobic TMOS particles

4 is TEM analysis data of the hydrophobic TMOS precursor and superhydrophobic TMOS particles prepared according to Example 1.

TMOS, MTMS, and IPA were mixed in a weight ratio of 1:1:2, and 0.8 to 1.0 wt% of TMCS diluted with distilled water and IPA was added to control the pH to 2 to 3, followed by stirring for 2 hours to hydrolyze TMOS. As a result, a hydrophobic precursor was prepared. Next, 0.4-0.8% of the HMDS mixed solution diluted with IPA and 20-30% of MTMS were added to the prepared hydrophobic precursor, and stirred for 8 hours while maintaining pH 6-7 to prepare superhydrophobic silica particles. did

Looking at the TEM image of FIG. 4 , it can be seen that superhydrophobic silica particles having a diameter of about 25 nm were synthesized.

Example 2. FT-IR analysis of superhydrophobic silica particles

5 is a result of FT-IR analysis of superhydrophobic silica particles, TMOS, and a hydrophobic precursor prepared according to Example 1.

FT-IR analysis was performed to confirm the structure of the prepared superhydrophobic silica particles. As a comparative group, analysis of TMOS and hydrophobic precursors produced by TMOS hydrolysis was performed together.

In the case of TMOS, a Si-O-Si peak at 1040-1100 cm ^-1 and -OH peak at 3420 cm ^-1 are observed, but in the case of a hydrophobic TMOS precursor and a superhydrophobic silica particle, as the reaction proceeds It can be seen that CH peaks and Si-CH ₃ peaks appear at 1253 and 2960 cm ^-1 . In particular, it can be seen that the sizes of the CH peak and the Si-CH ₃ peak appear larger in the superhydrophobic silica particles than in the hydrophobic precursor. Accordingly, it can be confirmed that the hydrophobicization of the particle surface is performed according to the progress of the polymerization reaction.

Example 3. Characterization of superhydrophobic silica particles according to hydrolysis reaction time

Figure 6 is an image of the dispersion stability according to the reaction time between the preparation of the hydrophobic TMOS precursor according to Example 3.

Regarding the reaction for preparing the superhydrophobic silica particles of Example 1, the reaction times of TMOS and TMCS for preparing the hydrophobic precursor were adjusted to 2 hours, 3 hours, and 4 hours, respectively. It was confirmed that as the reaction time of TMOS and TMSC was varied, the degree of hydrolysis reaction of TMOS was changed, and accordingly, the reaction mode of superhydrophobic silica particle condensation polymerization was changed. Specifically, when HMDS and MTMS were added in the condensation polymerization reaction, the pH changed from acidic to basic, and at this time, it was confirmed that interparticle aggregation occurred depending on the degree of hydrolysis of TMOS. Specifically, when the hydrolysis reaction proceeded for about 4 hours, it was confirmed that precipitation occurred due to partial gelation in the condensation polymerization reaction. When the hydrolysis reaction proceeded for about 2 hours, it was confirmed that precipitation due to gelation did not occur in the condensation polymerization reaction.

7 is TEM analysis data for partial aggregation according to pH control in the formation of superhydrophobic TMOS particles according to Example 3.

When HMDS was added to the hydrophobic precursor formed after the hydrolysis reaction, it was confirmed through TEM analysis that non-uniformity between particles occurred due to local aggregation according to pH control and the dispersion stability of the solution was lowered.

Example 4. Contact angle measurement

8 is a photograph of a comparison of contact angles between a general ceramic coating according to Example 4 and a ceramic coating in which a hydrophobic TMOS precursor and superhydrophobic TMOS particles are introduced.

After adding a hydrophobic precursor and superhydrophobic silica particles to a general ceramic coating solution, respectively, the solution was coated on the substrate. Next, distilled water was dropped on the solution-coated substrate with a #3 needle of a 0.05 mL syringe, and the contact angle of a water drop within 3 mm was measured to compare the degree of hydrophobicity. In the case of the general ceramic coating, the contact angle was 90.4 °, and the ceramic coating to which the hydrophobic precursor and superhydrophobic silica particles were added showed a significant increase from 107.4 ° to 155.4 °, respectively. Therefore, it can be confirmed that a superhydrophobic surface of 140° or more can be formed when the superhydrophobic silica particles are added.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art or those having ordinary knowledge in the art do not deviate from the spirit and technical scope of the present invention described in the claims to be described later. It will be understood that the present invention can be variously modified and changed within the scope not specified.

Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (10)

A superhydrophobic nano silica particle containing a spherical skeleton composed of alternating bonds of silicon and oxygen atoms,
The superhydrophobic nano silica particles are a compound represented by Formula 3 below, super hydrophobic nano silica particles.
[Formula 3]

In Formula 3, R ¹ to R ¹⁸ are each independently a methyl group (Methyl) or an ethyl group (Ethyl).
delete delete According to claim 1,
A first step of hydrolyzing monomeric tetramethylorthosilicate (Tetramehtylorthosilicate); and
Second, synthesized through the second step of synthesizing a hydrophobic compound including a spherical skeleton composed of alternating silicon and oxygen atoms by condensation polymerization of hydrolyzed tetramethylorthosilicate. Hydrophobic nano silica particles. A first step of hydrolyzing monomeric tetramethylorthosilicate (Tetramehtylorthosilicate); and
A second step of synthesizing a hydrophobic compound including a spherical skeleton composed of alternating silicon atoms and oxygen atoms by condensation polymerization of hydrolyzed tetramethylorthosilicate,
In the first step and the second step, at least one compound selected from the group consisting of alkyl silane, alkoxy silane, and silazne is added during hydrolysis and condensation polymerization, respectively. , as a method for synthesizing superhydrophobic nano silica particles,
The superhydrophobic nano silica particles are a compound of Formula 3 below, a method for synthesizing super hydrophobic nano silica particles.
[Formula 3]

In Formula 3, R ¹ to R ¹⁸ are each independently a methyl group (Methyl) or an ethyl group (Ethyl). According to claim 5,
Trimethylchlorosilane is added in the first step to promote the hydrolysis reaction of tetramethylorthosilicate in an acidic atmosphere without the addition of other acidic compounds. Method for synthesizing superhydrophobic nano silica particles. According to claim 5,
In the second step, hexamethyldisilazane is added to promote the condensation polymerization reaction of tetramethylorthosilicate hydrolyzed in a basic state, and at the same time, a methyl group is introduced on the spherical skeleton. A method for synthesizing hydrophobic nano silica particles. According to claim 5,
Method for synthesizing superhydrophobic nano silica particles, wherein an alcohol solvent is further added to control the rate of condensation polymerization of tetramethylorthosilicate hydrolyzed in the second step. According to claim 5,
In the second step, methyltrimethoxysilane is further added to modify the hydroxy group provided on the surface of the spherical skeleton to a methyl group. According to claim 5,
The hydrophobic compound synthesized after performing the second step includes a spherical skeleton composed of alternating bonds of silicon atoms and oxygen atoms,
A group represented by Formula 1 is bonded to at least one of the silicon atoms constituting the spherical framework,
[Formula 1]

In Formula 1, R ¹ , R ² and R ³ are each independently a C1 to C5 hydrocarbon compound, a method for synthesizing superhydrophobic nano silica particles.