KR20180138268A - Apparatus for concentrating VOCs and preparing method thereof and analyzing method using the same - Google Patents

Abstract

The present invention provides a volatile organic compound, comprising: a filter paper including cellulose; and a coating polymer layer formed on a surface of the filter paper, wherein the coating polymer layer is modified with a hydroxyl group (-OH) end group and bonded to a hydroxyl group (-OH) of the cellulose. Therefore, an economical volatile organic compound concentrator capable of mass production by replacing a high-priced volatile organic compound concentrator can be provided.

Description

TECHNICAL FIELD The present invention relates to a volatile organic compound concentrator, a method for producing the same, and a method for measuring the concentration of a volatile organic compound using the same.

The present invention relates to a volatile organic compound concentrator capable of analyzing the concentration of an organic compound by concentrating the volatile organic compound, a method for producing the same, and a method for measuring the concentration of volatile organic compounds using the same.

A volatile organic compound is a generic name of a liquid or gaseous organic compound which is composed of a hydrocarbon compound and has a high vapor pressure and is easily evaporated into the atmosphere. It is known as a substance that generates ozone and photochemical smog by causing photochemical reaction in the atmosphere.

In addition, if volatile organic compounds are volatilized in the air, it may cause bad odors, and cause nervous system disorders through skin contact or respiratory breathing.

Recently, regulations on the atmospheric environment have been tightened. Treatment techniques for odor components such as hydrogen sulfide and compounds such as toluene and xylene are continuously being developed.

In order to remove the volatile organic compounds, it is necessary to perform the analysis process by measuring the accurate concentration. However, the conventional concentration measuring method for directly extracting the headspace gas and measuring the relative standard error (RSD ) Is so large that the reliability of the measured data is very low.

Particularly, a method of concentrating volatile organic compounds in SPME, needle trap, tenax tube and the like is generally used by pretreatment analysis of volatile low-concentration artifacts, Is very expensive, and there are inconveniences to use additional accessory products for sampling such as portable pumps.

It is urgent to develop a volatile organic compound concentrator capable of collecting and collecting volatile organic compounds in a convenient and economical manner because frequent occurrence of volatile organic compounds in various accidents and indoors, It is true.

As a prior art related to this, there is a malodorous and volatile organic compound adsorption concentrator disclosed in Korean Patent No. 1711618 (Announcement: 2017.03.03).

Korean Patent No. 1711618 (Publication date 2017.03.03)

Accordingly, the present invention provides a volatile organic compound concentrator which can be produced more economically and can be concentrated and analyzed at a low concentration, and which is immediately available in the field, a method for producing the same, and a method for measuring the concentration of an organic compound using the same .

The problems to be solved by the present invention are not limited to the above-mentioned problem (s), and another problem (s) not mentioned can be understood by those skilled in the art from the following description.

In order to solve the above problems, the present invention provides a filter paper comprising cellulose; And a coating polymer layer formed on the surface of the filter paper, wherein the coating polymer layer is modified with a hydroxyl group (-OH) end group and bonded to a hydroxyl group (-OH) of the cellulose Volatile organic compound concentrator.

In addition, the coating polymer layer may be one obtained by reacting a precursor having increased reactivity by a crosslinking agent and a hydroxyl terminated polydimethylsiloxane to gel.

Also, the crosslinking agent is trifluoroacetic acid, the precursor is methyltrimethoxysilane, and the trifluoroacetic acid may increase the reactivity of methyltrimethoxysilane.

It may further comprise a carbon layer between the filter paper and the coating polymer layer.

The carbon layer may be any one selected from the group consisting of activated carbon, fullerene, and graphite.

According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: (a) forming a homogeneous mixture by mixing a precursor and a polymer; Adding a crosslinking agent to the mixture to prepare a coating liquid (second step); Applying the coating liquid to the filter paper and performing a gelation reaction to form a coating polymer layer (step 3); And recovering the filter paper on which the coating polymer layer is formed, followed by washing and drying (Step 4).

The crosslinking agent is 95% trifluoroacetic acid. The precursor is methyltrimethoxysilane. The crosslinking agent may be added in an amount of 10 to 50 parts by weight based on 100 parts by weight of the precursor.

Also, in the second step, the polymer is a hydroxyl terminated polydimethylsiloxane, and 150 to 800 parts by weight of the precursor may be mixed with 100 parts by weight of the polymer to prepare a coating solution.

In addition, the coating polymer layer of the third step may be formed by adding 100 to 400 L of polydimethylsiloxane to a filter paper having a diameter of 42.5 mm.

Also, the carbon material may be formed as a slurry before the third step, and a carbon layer may be formed by applying a slurry such that the carbon material is less than 1 wt% with respect to the coating liquid.

The carbon material may be any one selected from the group consisting of activated carbon, fullerene, and graphite.

According to another aspect of the present invention, there is provided a method of preparing a polymer electrolyte membrane, comprising: (a) mixing a precursor and a polymer to form a homogeneous mixture; (b) adding a crosslinking agent to the mixture to prepare a coating liquid; (c) applying the coating liquid to the filter paper and performing a gelation reaction to form a coating polymer layer; (d) recovering the filter paper on which the coating polymer layer is formed, and washing and drying to prepare a volatile organic compound concentrator; And (e) exposing the concentrator to a container headspace containing the volatile organic compound to measure the concentration of the volatile organic compound, wherein the relative standard deviation of the volatile organic compound concentration measurement value is reduced A method for measuring the concentration of a volatile organic compound using an organic compound concentrator is provided.

According to the present invention, there is provided an economical volatile organic compound concentrator capable of replacing an expensive volatile organic compound concentrator in mass production.

Also, by using a cellulose-based filter paper, a polymer material that can be concentrated by reacting with an organic compound on a substrate having a greatly increased surface area can be identified, and a new coating method can be provided.

Also, since the manufactured volatile organic compound concentrator can test various samples at the same time, it can be directly applied to the atmospheric environment monitoring in which the exposure evaluation of volatile organic compounds is simultaneously performed in a passive manner.

Also, since the relative standard error can be reduced by effectively concentrating the low concentration volatile organic compounds, the reliability of the measurement of the volatile organic compound concentration can be greatly increased.

1 shows a process sequence of a method for producing a volatile organic compound concentrator according to another aspect of the present invention.
2 is a schematic view showing a process of manufacturing a volatile organic compound concentrator according to another aspect of the present invention.
FIG. 3 shows a process sequence of a method for measuring a volatile organic compound concentration using a volatile organic compound concentrator according to another aspect of the present invention.
4 is a Fourier transform infrared spectroscopic analysis result of a volatile organic compound concentrator and a control group according to an embodiment of the present invention.
FIG. 5 is a scanning electron microscope (SEM) image of a surface of a coating liquid according to an embodiment of the present invention. FIG.
6 is a photograph of a process of concentrating volatile organic compounds in a vial using a volatile organic compound concentrator according to an embodiment of the present invention.
7 is a graph showing concentration efficiency according to additives of a volatile organic compound concentrator according to an embodiment of the present invention.

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

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving it will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The volatile organic compound concentrator according to the present invention comprises a filter paper and a coating polymer layer.

The filter paper is made of cellulose.

The filter paper can exhibit much better economical efficiency than a solid state microextraction (SPME) cartridge, which is a sampler used for analyzing volatile organic compounds in the past.

When the volatile organic compound concentrator is manufactured using the filter paper as a substrate, it can be mass-produced, easily deformed, and efficiently cope with various field and in-situ analyzes in which volatile organic compounds are generated.

Since the filter paper is made of cellulose, its surface area is very large as compared with the mass, which is very advantageous for concentration of volatile organic compounds.

The coating polymer layer may be formed by coating a hydrophobic polymer.

The coating polymer layer has a hydroxyl termination group (-OH terminated).

Accordingly, the coating polymer layer may be a hydroxyl terminated polydimethylsiloxane (OH-terminated PDMS) having a hydrophobic polymer.

The cellulose of the filter paper contains a large amount of hydroxyl groups (-OH) and can bind to the hydroxyl end groups of the polydimethylsiloxane.

The coating polymer layer may be gelated by reacting a precursor having increased reactivity by a cross-linking agent and a hydroxyl terminated polydimethylsiloxane (OH-terminated PDMS).

The crosslinking agent is trifluoroacetic acid (TFA), and the precursor is methyltrimethoxysilane.

TFA is strongly acidic due to the high electronegativity of the CF3 group and can act as an acid catalyst. TFA enhances the condensation reactivity between -OH of cellulose, hydroxyl-terminated PDMS, and Si-OMe of the precursor, thereby promoting the gelation on the surface of the filter paper. Also, since the boiling point of TFA is as low as 72.4 ° C, it is very easy to remove residues during the drying process of the concentrator post treatment.

The crosslinking agent of the polydimethylsiloxane is mainly an alkoxysilane-based material. The crosslinking agent of the polydimethylsiloxane is methyltrimethoxysilane in which one alkoxy group is substituted with an alkyl group as compared with tetraalkoxysilane, ) Can prevent cracking in the drying process, it is highly desirable to use methyltrimethoxysilane as a precursor.

The reactivity of methyltrimethoxysilane, which is a precursor, may be greatly increased by adding triroaacetic acid as the crosslinking agent.

A portion of the methyltrimethoxysilane with increased reactivity reacts with hydroxy groups of cellulose and some forms a coating polymer layer with a sol-gel reaction with OH-terminated PDMS.

The filter paper coated with polydimethylsiloxane and methyltrimethoxysilane (hereinafter referred to as 'PDMS-FP') can be used as a concentrator for volatile organic compounds and can be substituted for conventional SPME.

And a carbon layer between the filter paper and the coating polymer layer.

The carbon material may be any one selected from the group consisting of activated carbon, fullerene, and graphite.

When the carbon layer is formed, the concentration effect on the low molecular weight volatile organic compound may be greatly increased.

Particularly, when the carbon layer is formed of activated carbon, it can exhibit a much higher concentration efficiency than fullerene or graphite, which is highly desirable.

1 shows a process sequence of a method for producing a volatile organic compound concentrator according to another aspect of the present invention.

2 is a schematic view showing a process of manufacturing a volatile organic compound concentrator according to another aspect of the present invention.

1 and 2, a method for preparing a volatile organic compound concentrator according to the present invention comprises mixing a precursor and a polymer to form a homogeneous mixture (Step 1), mixing a precursor and a polymer to form a homogeneous mixture Step (first step); Adding a crosslinking agent to the mixture to prepare a coating liquid (second step); Applying the coating liquid to the filter paper and performing a gelation reaction to form a coating polymer layer (step 3); And recovering and washing the filter paper on which the coating polymer layer is formed (fourth step).

The reactivity of the precursor may be increased by adding a crosslinking agent to the precursor (S100).

Wherein the crosslinking agent is trifluoroacetic acid and the precursor is methyltrimethoxysilane.

The crosslinking agent may be added in an amount of 10 to 50 parts by weight based on 100 parts by weight of the precursor.

If the addition amount of the cross-linking agent is less than 10 parts by weight, it is difficult to increase the reactivity, and when it exceeds 50 parts by weight, the curing degree of the coating layer is high, and the concentrator is broken.

On the other hand, the polymer is a hydroxyl terminated polydimethylsiloxane having a hydroxyl end group.

The OH-terminated PDMS and methyltrimethoxysilane, which is a precursor having increased reactivity, may be mixed to prepare a coating solution (S20).

150 to 800 parts by weight of a precursor may be mixed with 100 parts by weight of the polymer to prepare a coating solution.

When the precursor is added in an amount of less than 150 parts by weight, it is difficult to uniformly form a coating layer when it is applied to a filter paper because of high viscosity. When 800 parts by weight or more of the precursor is added, viscosity is decreased, , The coating liquid is lost to the outside of the filter paper during the coating operation of the coating polymer layer.

Since the hydroxy group of the OH-terminated PDMS can be gelated with the precursor for sol-gel reaction, a coating polymer layer can be formed on the filter paper.

The coating liquid may be applied to the filter paper and gelated to form a coating polymer layer (S30).

The coating polymer layer may be added with 100 to 400 μL of the coating solution to the 42.5 mm diameter filter paper (Whatman GR1).

When the amount of the coating solution is increased, the volatile organic compounds to be concentrated are increased. However, when the amount of the coating solution is more than 400 μL, there is no difference in the concentration effect of the volatile organic compounds according to the excess amount, It does not work.

When the coating solution is less than 100 μL, the concentration efficiency drops sharply and the relative standard deviation (RSD) relative to the concentration measurement value is large, so that the reliability of the measured value is low.

The carbon material may be formed as a slurry before the third step, and a carbon layer may be formed by applying a slurry such that the carbon material is less than 1 wt% with respect to the coating liquid.

The carbon material may be any one selected from the group consisting of activated carbon, fullerene, and graphite.

When the carbon material is selected as the activated carbon, the concentration of the volatile organic compound is more preferable than that of the fullerene or graphite.

When the carbon layer is added within the above range, the concentration effect of the volatile organic compound can be greatly increased. In the range of the addition ratio of 0.2-1 wt%, the concentration effect tends to increase as the addition ratio increases.

According to another aspect of the present invention, there is provided a method for measuring a volatile organic compound concentration using a volatile organic compound concentrator.

FIG. 3 shows a process sequence of a method for measuring a volatile organic compound concentration using a volatile organic compound concentrator according to another aspect of the present invention.

Referring to FIG. 3, a volatile organic compound concentration measuring method according to the present invention comprises the steps of preparing a volatile organic compound concentrator according to FIG. 1, measuring the concentration of a volatile organic compound by exposing a concentrator to a container head space containing a volatile organic compound However, the relative standard deviation of the volatile organic compound concentration measurement value can be greatly reduced.

At this time, the volatile organic compound may be mixed with the solid phase material, and the concentrator may be disposed away from the solid phase material.

The solid phase material may be a preservative such as activated carbon, dried or montmorillonite.

The volatile organic compound may be a liquid phase material in which volatile organic compounds are mixed, and may have a concentration of 10 ppb or more.

Therefore, when measuring the concentration of volatile organic compounds by directly extracting the headspace, it is difficult to measure the concentration of volatile organic compounds quickly and accurately because the relative standard deviation of the error ratio is very large. However, when a small amount of activated carbon is used as the volatile organic compound The concentration of volatile organic compounds can be determined very accurately and quickly when placed with a concentrator.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples.

< Example  1> Volatile organic compounds  Thickener ( PDMS - FP ) Produce

25 mm diameter filter paper (Whatman GR1 filter paper, Sigma-Aldrich) was prepared.

The filter paper had a thickness of 180 μm, a pore size of 11 μm, an Ash content of 0.06% or less, and a density of 87 g / m ² .

2 mL of hydroxyl terminated polydimethylsiloxane (Sigma-Aldrich) and 0.5 mL of 95% trifluoroacetic acid (Sigma-Aldrich) were added to 4 mL methyltrimethoxysilane (Sigma-Aldrich) To prepare a coating solution.

The coating solution was mixed at a rate of 2000 rpm for 5 minutes using a planetary centrifugal mixer to homogenize the coating solution.

Apply 80 μL of the coating solution to each filter paper, dry at 110 ° C for 1 hour, and gradually lower the temperature to room temperature.

The filter paper was immersed in DI water and acetone for 24 hours to remove impurities, followed by washing and drying to prepare a volatile organic compound concentrator.

< Example  2> Containing carbon additive PDMS - FP  Produce

25 mm diameter filter paper (Whatman GR1 filter paper, Sigma-Aldrich) was prepared.

400 mg activated carbon, fullerene or graphite was dispersed by ball milling in 40 mL methyltrimethylsilane and the slurry was diluted 2 to 10 times with methyltrimethylsilane to prepare a carbon layer on the filter paper I write to coat.

The filter paper is placed on a spin-coater, and 120 μL of the carbon slurry is applied at a rotation speed of 400 rpm for 25 seconds, followed by drying at 110 ° C. for 1 hour.

2 mL of hydroxyl terminated polydimethylsiloxane (Sigma-Aldrich) and 0.5 mL of 95% trifluoroacetic acid (Sigma-Aldrich) were added to 4 mL methyltrimethoxysilane (Sigma-Aldrich) To prepare a coating solution.

The coating solution was mixed at a rate of 2000 rpm for 5 minutes using a planetary centrifugal mixer to homogenize the coating solution.

The filter paper coated with the carbon layer was coated with 80 liters of the coating solution, dried at 110 for 1 hour, and slowly cooled to room temperature.

The filter paper was immersed in DI water and acetone for 24 hours to remove impurities, followed by washing and drying to prepare a volatile organic compound concentrator.

< Experimental Example  1> Volatile organic compounds  Physical properties of thickener

The surface chemistry of the prepared volatile organic compound concentrator was analyzed using a Fourier transform infrared spectrometer (FT-IR / ATR) to confirm that a coating polymer layer was formed on the filter paper.

4 is a Fourier transform infrared spectroscopic analysis result of a volatile organic compound concentrator and a control group according to an embodiment of the present invention.

Referring to FIG. 4, it was confirmed that the -OH functional group was eliminated by cross-linking in the presence of trifluoroacetic acid in the filter paper and OH-terminated PDMS.

Therefore, it was confirmed that the triflouroacetic acid, which is a crosslinking agent, plays a determining role in cross-linking the filter paper and the polymer.

On the other hand, the morphology of the surface and cross section according to the OH-terminated PDMS content in the coating solution for the filter paper was observed using a scanning electron microscope (SEM).

FIG. 5 is a scanning electron microscope (SEM) image of a surface of a coating liquid according to an embodiment of the present invention. FIG.

Referring to FIG. 5, the fiber structure of the filter paper was maintained well when the amount of the coating solution was 100 to 200 μL, and the tendency of the fiber structure to be covered by the polymer coating surface was observed as the addition amount was increased there was.

< Experimental Example  2> Volatile organic compounds  Concentration analysis

In order to solve the problem of a large error rate (RSD) of the method of measuring the concentration of volatile organic compounds by direct extraction of the headspace gas, the volatile organic compound concentrator (hereinafter referred to as 'PDMS-FP' Were measured and compared with headspace gas headspace gas direct method results.

Direct analysis was performed by directly extracting 10 μL of vial headspace gas using a gas-tight syringe and injecting it directly into GC / MS.

6 is a photograph of a process of concentrating volatile organic compounds in a vial using a volatile organic compound concentrator according to an embodiment of the present invention.

Referring to FIG. 6, the method using PDMS-FP was performed by exposing the PDMS-FP to the vaporized toluene through a vial cap, collecting the concentrate, extracting with 2 mL of CS2, injecting 1 μL of the extracted solution into GC / Respectively.

Analysis method PDMS addition amount (μL) sampler concentration
(mg toluene / g
sampler) RSD (%) Headspace gas
Direct injection into GC-MS 0 NA 38.2 Extraction analysis after concentration of concentrator 100 0.7 257.8 200 51.7 12.5 300 50.3 37.3 400 59.2 11.2

Table 1 shows the results of extraction and analysis after concentration with a headspace gas and a concentrator.

The RSD value was lower when PDMS-FP was used than the headspace gas direct analysis method (except when the coating liquid injection volume was 100 μL), and toluene enrichment efficiency was higher as the coating liquid injection amount was larger. When the concentration of toluene was greater than 200 μL, the PDMS-FP tended to brittle as the injection amount increased, and the effect of increasing the surface area from the fiber structure on the surface of the filter paper was reduced. Was determined to be 200 μL.

< Experimental Example  3> Antiseptic  Use in performance evaluation

The volatilization inhibition performance of volatile organic compounds in PDMS-FP was investigated.

Referring to FIG. 6, 0.2 g of the volatile organic compound and the control agent g (20) are placed in a vial, and the vaporized organic compound is absorbed in the PDMS-FP 10 during mixing for 1 hour on a horizontal mixer.

Antiseptic Blank sample preparation
Samples containing preservative
Steam Generation ± RSD (%) Evaporation inhibitory effect Blank 100% ± 11% Benchmark
(Untreated control agent) Dryness 111% ± 5% -11% Montmorillonite 76% ± 4% 24% Activated carbon 6% ± 9% 94%

Blank results show the amount of volatile organic compounds vaporized in the headspace exposed to PDMS-FP in the presence of liquid phase volatile organic compounds without treatment, and the value is set as a 100% reference value.

When the remaining three inhibitors are mixed with volatile organic compounds, the amount of VOC exposed to PDMS-FP is compared with the blank value. 1) In case of VOC, ) In the case of activated carbon, it was found that the volatile matter was suppressed by the bag preparation of 94% of the amount of VOC to be volatilized without the treatment agent.

At this time, the RSD was significantly lower than that of the direct headspace gas analysis shown in Table 1, and it was confirmed that the reliability of the analysis was improved through the PDMS-FP concentration process.

< Experimental Example  4> Effect of coating liquid additive

Since carbonaceous materials with high surface area such as activated carbon and carbon nanotube have excellent adsorption ability of hydrophobic organic chemical, we performed experiments to improve the performance of PDMS-FP using this property .

Several carbon materials were added as 1 wt% of the coating solution.

Activated carbon (AC), fullerene (FL) and graphite (GP) were used as additive in the active carbon system as a typical carbon material. Ball-milling was used for homogeneous coating. Thereby increasing the degree of dispersion.

In order to prevent the disappearance of the carbon material during the final washing process, the carbon layer was protected by applying a carbon slurry, drying the carbon layer, and applying a polymer coating layer on the carbon layer.

To evaluate the performance of the prepared PDMS-FP, various volatile organic compounds were evaluated. A 25-mm diameter concentrator was inserted into a 40-ml vial lid, and 10 ml of deionized water (DI water) After 10 μL of VOC MIX (10 ppm) was added, the vial cap in which the concentrator was inserted was closed and left for 10 minutes.

The sample was transferred to a 20 ml vial and then extracted with CS2 for 30 min. The extract was analyzed by GC / MS.

7 is a graph showing concentration efficiency according to additives of a volatile organic compound concentrator according to an embodiment of the present invention.

Referring to FIG. 7, the concentration of the volatile organic compound increased remarkably when 1 wt% of activated carbon (AC) was added, compared with the case without the additive. In particular, the effect of the low molecular weight compound was great.

 The present invention provides a concentrator for analyzing volatile organic compounds generated from an accident site and an indoor environment by using a filter paper, and evaluates its performance.

The method of preparing cellulose-based filter paper and PDMS through sol-gel reaction is an untried method, and its application range can be extended if it is cost effective.

Compared with the headspace gas direct analysis method, when the volatile organic compound concentrator was used, the error rate was lowered and the effect of improving the quality of the analysis was confirmed. Also, the test time was shortened because a plurality of experimental conditions could be tested at the same time . Furthermore, experiments were carried out to examine whether the carbonaceous additives (activated carbon, graphite, fullerene) with a large surface area could be applied under the coating polymer layer to increase the concentration efficiency of volatile organic compounds. The concentration efficiency of EPA VOC MIX2 .

Particularly, it is pointed out that the low concentration of volatile low molecular weight substance is relatively low in PDMS based concentrator sampler (SPME, etc.), and this experimental result shows that this disadvantage can be improved by addition of small amount of activated carbon It suggests.

The volatile organic compound concentrator according to the present invention can be utilized in atmospheric environment monitoring in which exposure evaluation at various places is simultaneously performed in a passive manner.

Although the embodiments of the present invention have been described with respect to the method for measuring the concentration of volatile organic compounds using the volatile organic compound concentrator according to the present invention and the method for producing the same, various modifications may be made without departing from the scope of the present invention. Do.

Therefore, the scope of the present invention should not be construed as being limited to the embodiments described, but should be determined by equivalents to the appended claims, as well as the following claims.

It is to be understood that the foregoing embodiments are illustrative and not restrictive in all respects and that the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

Claims (12)

A filter paper comprising cellulose; And
And a coating polymer layer formed on a surface of the filter paper,
Wherein the coating polymer layer is modified with a hydroxy group (-OH) end group and bonded to a hydroxyl group (-OH) of the cellulose.
The method according to claim 1,
The coating polymer layer
Wherein a precursor having increased reactivity by a crosslinking agent and a hydroxyl terminated polydimethylsiloxane react with each other to be gelated.
3. The method of claim 2,
Wherein the crosslinking agent is trifluoroacetic acid, the precursor is methyltrimethoxysilane, and the trifluoroacetic acid is a volatile organic compound which is characterized by increasing the reactivity of methyltrimethoxysilane. Compound concentrator.
The method according to claim 1,
Further comprising a carbon layer between the filter paper and the coating polymer layer.
5. The method of claim 4,
The carbon layer
Wherein the volatile organic compound concentrate is any one selected from the group consisting of activated carbon, fullerene, and graphite.
Mixing the precursor and the polymer to form a homogeneous mixture (first step);
Adding a crosslinking agent to the mixture to prepare a coating liquid (second step);
Applying the coating liquid to the filter paper and performing a gelation reaction to form a coating polymer layer (step 3); And
And recovering and washing the filter paper on which the coating polymer layer is formed (step 4).
The method according to claim 6,
Wherein the crosslinking agent is 95% trifluoroacetic acid, the precursor is methyltrimethoxysilane,
Wherein the cross-linking agent is added in an amount of 10 to 50 parts by weight based on 100 parts by weight of the precursor.
The method according to claim 6,
In the second step,
The polymer is a hydroxyl terminated polydimethylsiloxane,
Wherein 150 to 800 parts by weight of the precursor is mixed with 100 parts by weight of the polymer to prepare a coating solution.
The method according to claim 6,
The coating polymer layer of the third step
And adding 100 to 400 μL of the coating solution to the 42.5 mm diameter filter paper (Whatman GR1).
The method according to claim 6,
Before the third step
The carbon material is produced as a slurry,
Wherein a carbon layer is formed by applying a slurry so that the carbon material is less than 1 wt% with respect to the coating liquid.
11. The method of claim 10,
The carbon material
Wherein the organic solvent is any one selected from the group consisting of activated carbon, fullerene, and graphite.
(a) mixing a precursor and a polymer to form a homogeneous mixture;
(b) adding a crosslinking agent to the mixture to prepare a coating liquid;
(c) applying the coating liquid to the filter paper and performing a gelation reaction to form a coating polymer layer;
(d) recovering the filter paper on which the coating polymer layer is formed, and washing and drying to prepare a volatile organic compound concentrator; And
(e) exposing the concentrator to a container headspace containing a volatile organic compound to measure the concentration of the volatile organic compound, wherein the relative standard deviation of the volatile organic compound concentration measurement value is reduced Determination of volatile organic compound concentration using concentrator.

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