Odor suppressant based on fluorocarbon-hydrocarbon binary surfactant and preparation method thereof

Abstract

The invention discloses an odor inhibitor based on a fluorocarbon-hydrogen binary surfactant, belonging to the technical field of odor control for contaminated soil restoration. The odor inhibitor comprises the following components by mass percentage: 0.5%-1.5% of a fluorocarbon surfactant, 2.0%-4.0% of dodecyl betaine, 15.0%-25.0% of polyvinyl alcohol, 1.0%-3.0% of sodium carboxymethyl cellulose, 1.0%-3.0% of xanthan gum, 2.0%-3.0% of alkyl glycoside, 1.0%-2.0% of ammonium sulfate, and the balance is water, and the sum of the above components is 100%. The inhibitor is highly efficient, durable, inexpensive and stable, and the preparation method is simple and easy.

Description

Technical Field

[0001] The invention relates to an odor inhibitor and a preparation method thereof, in particular to an odor inhibitor based on a fluorocarbon-hydrocarbon binary surfactant and a preparation method thereof, belonging to the technical field of odor control in contaminated soil remediation. Background Art

[0002] With the rapid development of industry and the improvement of people's quality of life, environmental pollution problems are emerging one after another. Among them, the organic pollution of soil not only wastes the land, but also disturbs people's peace with the odor emitted by organic matter. There are two main methods to deal with this odor problem, film covering and foam covering, but both methods have corresponding problems in the use process. The film covering method requires the construction of a greenhouse. Even for the restoration of a small area of ​​contaminated soil, it requires a lot of manpower and material resources. In the film covering method, the used film is difficult to recycle, which is easy to cause re-contamination of organic matter. The foam covering method can completely isolate the air and soil, and achieve complete isolation of volatile organic matter. However, the existing foaming agents are mainly composed of strong oxidizing substances such as sodium hypochlorite and chlorine dioxide, which use their strong oxidizing properties to oxidize petroleum hydrocarbon pollutants with pungent odors. However, sodium hypochlorite and chlorine dioxide are prone to produce carcinogenic, teratogenic and mutagenic substances (such as chloroform) while oxidizing petroleum hydrocarbon pollutants, which greatly damage the functional activity of the soil itself, not only affecting the growth of crops, but also endangering human health. In addition, the foam duration of the existing foaming agents is short, and long-term isolation cannot be achieved.

[0003] At present, patent CN113856452A discloses an odor inhibitor for contaminated soil and a preparation method thereof. The inhibitor comprises polysorbate, slaked lime, sodium permanganate, starch, lignin and water. The method can improve the synergistic effect between the raw materials by limiting the order of adding the raw materials. The odor inhibitor for contaminated soil prepared can effectively solve the problem of odor and irritating odor in organic contaminated soil such as petroleum hydrocarbons during restoration, and will not cause secondary pollution to the soil. It can also improve the fertility of the soil and the activity of soil microorganisms. However, the onset time, duration of onset and inhibitory effect of the inhibitor are not improved, and it is only to avoid secondary pollution.

[0004] Patent CN114535283A discloses an odor inhibitor for organic pollution and its preparation method and application, including a film former, a stabilizer, a plasticizer, a thickener, a foaming agent, a dispersant, diatomaceous earth as an adsorbent, and water. The inhibitor blocks and adsorbs the odorous gas generated by the contaminated soil by producing foam and liquid ground film and adsorbent, thereby achieving the purpose of odor control. From the experimental data in the specification, it can be seen that the inhibitor can form a complete liquid ground film within 30 minutes after the foam dissipates, and the foam lasts for about 8 hours. After 48 hours, the blocking rate is maintained at 61.8-65%. The duration and blocking rate of the foam need to be improved. Therefore, the development of an odor inhibitor and its preparation method that can overcome the above defects has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The technical problem to be solved by the present invention is to propose an odor inhibitor based on fluorocarbon-hydrocarbon binary surfactant and a preparation method thereof in view of the shortcomings of the above prior art. The inhibitor is efficient, durable, cheap and stable, and the preparation method is simple and easy.

[0006] The technical solution of the present invention to solve the above technical problems is:

[0007] The invention discloses an odor suppressant based on a fluorocarbon-hydrocarbon binary surfactant. The odor suppressant comprises the following components by mass percentage: 0.5%-1.5% fluorocarbon surfactant, 2.0%-4.0% dodecyl betaine, 15.0%-25.0% polyvinyl alcohol, 1.0%-3.0% sodium carboxymethyl cellulose, 1.0%-3.0% xanthan gum, 2.0%-3.0% alkyl glycoside, 1.0%-2.0% ammonium sulfate, and the balance is water, wherein the sum of the above components is 100%.

[0008] The technical solution further defined in the present invention is:

[0009] Furthermore, in the aforementioned odor suppressant based on fluorocarbon-hydrocarbon binary surfactant, the odor suppressant comprises the following components by mass percentage: fluorocarbon surfactant: 1.0%, dodecyl betaine: 3.0%, polyvinyl alcohol: 20.0%, sodium carboxymethyl cellulose: 2.0%, xanthan gum: 2.0%, alkyl glycoside: 2.5%, ammonium sulfate: 1.5%, and water: 68%.

[0010] In the above-mentioned odor suppressant based on fluorocarbon-hydrocarbon binary surfactant, the water is purified water with a pH value of 6.5-8.5.

[0011] In the aforementioned odor suppressant based on fluorocarbon-hydrocarbon binary surfactant, the polyvinyl alcohol is PVA-124, and the viscosity of sodium carboxymethyl cellulose is 600-1000 mPa·s.

[0012] In the above-mentioned odor suppressant based on fluorocarbon-hydrocarbon binary surfactant, the dodecyl betaine is dodecyl dimethyl betaine; and the alkyl glycoside is alkyl glycoside 0810.

[0013] In the aforementioned odor suppressant based on fluorocarbon-hydrocarbon binary surfactant, the fluorocarbon surfactant is a perfluorinated branched short-chain anionic surfactant containing a double hydrophobic fluorocarbon chain, and its structure is as follows:

[0014]

[0015] The present invention also provides a method for preparing an odor suppressant based on a fluorocarbon-hydrocarbon binary surfactant, which specifically comprises the following steps:

[0016] (1) Prepare water, add polyvinyl alcohol and sodium carboxymethyl cellulose to the water, stir evenly at room temperature, and stir for 20-40 minutes;

[0017] (2) heating the mixture in step (1) to 70-80° C., adding ammonium sulfate, and stirring for 20-30 min;

[0018] (3) Dissolve xanthan gum, dodecyl betaine, alkyl glucoside, and fluorocarbon surfactant in water and stir for 5-15 minutes;

[0019] (4) Add the liquid obtained in step (3) to the mixed solution obtained in step (2), and stir for 5-15 minutes to obtain the odor suppressant.

[0020] The technical solution further defined in the present invention is:

[0021] Furthermore, in the aforementioned method for preparing an odor inhibitor based on a fluorocarbon-hydrocarbon binary surfactant, the stirring time in step (1) is 30 minutes.

[0022] In the above-mentioned method for preparing the odor inhibitor based on fluorocarbon-hydrocarbon binary surfactant, the heating temperature in step (2) is 75° C. and the stirring time is 25 min.

[0023] In the above-mentioned method for preparing the odor inhibitor based on fluorocarbon-hydrocarbon binary surfactant, the stirring time in step (3) is 10 min; the stirring time in step (4) is 10 min.

[0024] The beneficial effects of the present invention are:

[0025] (1) The odor suppressant of the present invention adds a fluorocarbon surfactant, and the foam produced has a smaller diameter and a denser arrangement. In addition, the barrier effect of the liquid ground film can more effectively block the spread of odor, and the odor suppression effect is good.

[0026] (2) The foam of the present invention has a longer duration and film-forming time, and can wrap the odorous soil better and faster, thereby achieving faster and more complete odor isolation and higher deodorization efficiency.

[0027] (3) The present invention can greatly improve the stability and durability of foam and liquid film during the odor suppression process by adding thickeners (sodium carboxymethyl cellulose, xanthan gum), stabilizers (ammonium sulfate) and foam stabilizers (alkyl polyglycosides). Fluorocarbon surfactants have good foam stability, which can make the generated foam smaller in diameter and more densely arranged, thereby achieving the purpose of long-term and high-efficiency odor suppression with a more lasting effect.

[0028] Dodecyl betaine can make the product produce a large amount of foam, but these foams have a large diameter, are easy to break and produce cavities. If used directly, the generated ground film will have holes and the odor suppression effect is not good; fluorocarbon surfactants can make the generated foam smaller in diameter and more densely arranged, but cannot make the foam stable for a long time; the addition of thickeners (carboxymethyl cellulose, xanthan gum) can make the foam stable for a long time, but will weaken the product's ability to generate foam; alkyl glycosides can enhance the product's ability to generate foam, and ammonium sulfate can enhance the product's stability; general fluorocarbon surfactants and hydrocarbon surfactants will lose their effect after mixing due to the interaction of charges, so it is necessary to select the corresponding hydrocarbon surfactant according to the structure, electrical properties and charge of the fluorocarbon surfactant. The present invention needs to overcome the above difficulties, so the fluorocarbon surfactant and dodecyl betaine are not a random combination, but a compound obtained after a series of screening, and some of the components have a complementary effect: the addition of sodium carboxymethyl cellulose and xanthan gum will thicken but reduce the foaming of the product, but after adding them together with alkyl glycosides, they can also thicken, but the foaming ability of the product is not affected.

[0029] Fluorocarbon-hydrocarbon binary surfactant is one of the commonly used high-efficiency foaming agents in the field of fine chemicals, combining the foaming property of hydrocarbon surfactant and the foam stability of fluorocarbon surfactant. After the foaming process, the two surfactant molecules are regularly arranged on the foam surface, and the stability of the foam is enhanced by inhibiting the gas diffusion between bubbles and slowing down the discharge of liquid. Biodegradable mulch is a type of plastic film that can be degraded by microorganisms in the natural environment, using natural biomass such as cellulose and starch and petroleum-based polymers such as dibasic acid diol copolyester as raw materials. The odor inhibitor of the present invention combines the advantages of fluorocarbon-hydrocarbon binary surfactant and biodegradable mulch, and can form dense foam after spraying (the addition of dodecyl betaine is conducive to the generation of a large amount of foam, and the addition of fluorocarbon surfactant will make the generated foam smaller in diameter and more tightly arranged, so dense foam will be formed after spraying), quickly covering the contaminated soil, and isolating harmful gases from diffusing into the environment under the dual effects of foam and polymer film. Under the action of fluorocarbon surfactants, the interfacial tension between foam and air decreases, which enhances the stability of foam from the level of individual foams; under the action of multiple thickeners (sodium carboxymethyl cellulose and xanthan gum), the viscosity between foams increases sharply, the correlation is enhanced, and the stability of foams is enhanced from the level of foam clusters. Under the action of film-forming agents (polyvinyl alcohol), dense foams will gradually form dense polymer films, further inhibiting the overflow of harmful gases. Therefore, the odor inhibitor of the present invention can achieve rapid and efficient inhibition of harmful gases, has a good inhibitory effect on harmful gases in polluted soil, and the ingredients used can be degraded in the natural environment, solving the problem of residual odor inhibitors. DETAILED DESCRIPTION

[0030] The present invention will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] The present embodiment provides an odor suppressant based on a fluorocarbon-hydrocarbon binary surfactant, which includes the following ingredients: fluorocarbon surfactant: 1.0 g, dodecyl betaine: 3.0 g, polyvinyl alcohol: 20.0 g, sodium carboxymethyl cellulose: 2.0 g, xanthan gum: 2.0 g, alkyl glycoside: 2.5 g, ammonium sulfate: 1.5 g, and water: 68 g.

[0033] The preparation method of the odor suppressant based on the fluorocarbon-hydrocarbon binary surfactant specifically comprises the following steps:

[0034] (1) Take purified water with an appropriate pH value of 6.5 according to the proportion of the above odor suppressant components, add polyvinyl alcohol and sodium carboxymethyl cellulose with a viscosity of 600 mPa·s to the water, stir evenly at room temperature, and stir for 30 minutes;

[0035] (2) heating the mixture in step (1) to 75° C., adding ammonium sulfate, and stirring for 25 min;

[0036] (3) Dissolve xanthan gum, dodecyl betaine, alkyl glycoside, and fluorocarbon surfactant in water and stir for 10 minutes;

[0037] (4) Add the liquid obtained in step (3) to the mixed solution obtained in step (2), and stir for 10 minutes to obtain the odor suppressant.

[0038] Example 2

[0039] This embodiment provides an odor suppressant based on a fluorocarbon-hydrocarbon binary surfactant, which includes the following ingredients: fluorocarbon surfactant: 0.5 g, dodecyl betaine: 2.0 g, polyvinyl alcohol: 15.0 g, sodium carboxymethyl cellulose: 1.0 g, xanthan gum: 1.0 g, alkyl glycoside: 2.0 g, ammonium sulfate: 1.0 g, and water: 77.5 g.

[0040] The preparation method of the odor suppressant based on the fluorocarbon-hydrocarbon binary surfactant specifically comprises the following steps:

[0041] (1) Take purified water with an appropriate pH value of 7.0 according to the proportion of the above odor suppressant components, add polyvinyl alcohol and sodium carboxymethyl cellulose with a viscosity of 750 mPa·s to the water, stir evenly at room temperature, and stir for 20 minutes;

[0042] (2) heating the mixture in step (1) to 70° C., adding ammonium sulfate, and stirring for 20 min;

[0043] (3) Dissolve xanthan gum, dodecyl betaine, alkyl glycoside, and fluorocarbon surfactant in water and stir for 5 minutes;

[0044] (4) Add the liquid obtained in step (3) to the mixed solution obtained in step (2), and stir for 5 minutes to obtain the odor suppressant.

[0045] Example 3

[0046] This embodiment provides an odor suppressant based on a fluorocarbon-hydrocarbon binary surfactant, which includes the following ingredients: fluorocarbon surfactant: 1.5 g, dodecyl betaine: 4.0 g, polyvinyl alcohol: 25.0 g, sodium carboxymethyl cellulose: 3.0 g, xanthan gum: 3.0 g, alkyl glycoside: 3.0 g, ammonium sulfate: 2.0 g, and water: 58.5 g.

[0047] The preparation method of the odor suppressant based on the fluorocarbon-hydrocarbon binary surfactant specifically comprises the following steps:

[0048] (1) taking purified water with an appropriate pH value of 7.5 according to the proportion of the above odor suppressant components, adding polyvinyl alcohol and sodium carboxymethyl cellulose with a viscosity of 900 mPa·s to the water, stirring evenly at room temperature for 40 minutes;

[0049] (2) heating the mixture in step (1) to 80° C., adding ammonium sulfate, and stirring for 30 min;

[0050] (3) Dissolve xanthan gum, dodecyl betaine, alkyl glycoside, and fluorocarbon surfactant in water and stir for 15 minutes;

[0051] (4) Add the liquid obtained in step (3) to the mixed solution obtained in step (2), and stir for 15 minutes to obtain the odor suppressant.

[0052] Example 4

[0053] This embodiment provides an odor suppressant based on a fluorocarbon-hydrocarbon binary surfactant, which includes the following ingredients: fluorocarbon surfactant: 0.5 g, dodecyl betaine: 2.0 g, polyvinyl alcohol: 25.0 g, sodium carboxymethyl cellulose: 1.0 g, xanthan gum: 3.0 g, alkyl glycoside: 3.0 g, ammonium sulfate: 1.0 g, and water: 64.5 g.

[0054] The preparation method of the odor suppressant based on the fluorocarbon-hydrocarbon binary surfactant specifically comprises the following steps:

[0055] (1) Take purified water with an appropriate pH value of 8.5 according to the proportion of the above odor suppressant components, add polyvinyl alcohol and sodium carboxymethyl cellulose with a viscosity of 1000 mPa·s to the water, stir evenly at room temperature, and stir for 20 minutes;

[0056] (2) heating the mixture in step (1) to 80° C., adding ammonium sulfate, and stirring for 20 min;

[0057] (3) Dissolve xanthan gum, dodecyl betaine, alkyl glycoside, and fluorocarbon surfactant in water and stir for 15 minutes;

[0058] (4) Add the liquid obtained in step (3) to the mixed solution obtained in step (2), and stir for 5 minutes to obtain the odor suppressant.

[0059] Example 1 - Effect Verification Experiment

[0060] Experimental purpose: To verify the odor suppressing effect of the odor suppressing agent of the present invention on volatile organic compounds in contaminated soil. Experimental design: The effect of the odor suppressing agent of the present invention is demonstrated through a control experiment. An existing total volatile organic compound detector (TVOC) is used to detect the organic matter concentration of contaminated soil at different times when the odor suppressing agent of the present invention is used and when the odor suppressing agent of the present invention is not used.

[0061] Experimental operation: The soil used in the experiment was volatile organic contaminated soil from a chemical accident site in Yancheng City. Four portions of 400g of contaminated soil were taken and placed in three 600ml (diameter: height = 8cm: 13cm) beakers, and the odor inhibitor of Example 1 (labeled S1, S2 and S3) with a thickness of 1.0cm, 1.5cm and 2.0cm was sprayed on the soil surface of three portions respectively, and the other portion was not treated (labeled S0). The concentration of volatile organic matter at the mouth of the beaker was detected by TVOC at intervals, and the foam duration and film-forming effect were observed during this period.

[0062] Experimental results:

[0063] (1) Concentration of volatile organic compounds (mg / m 3 )

[0064] Table 1 Concentrations of volatile organic compounds in each experimental group at different times (mg / m 3 )

[0065]

[0066] (2) Film formation time and foam duration

[0067] The film-forming time of 1.0cm foam is about 10-15min, and the foam lasts for 30-35h. As the water in the foam gathers inward, under the action of the film-forming agent, the film takes 3.5-4h from the beginning to the complete formation; the film-forming time of 1.5cm foam is 10-20min, and the foam lasts for 35-45h. As the water in the foam gathers inward, under the action of the film-forming agent, the film takes 3.5-4h from the beginning to the complete formation; the film-forming time of 2.0cm foam is 10-20min, and the foam lasts for more than 48h (exceeding the test time). As the water in the foam gathers inward, under the action of the film-forming agent, the film takes about 4h from the beginning to the complete formation.

[0068] It can be seen that the present invention can achieve rapid, efficient and long-lasting suppression of harmful gases, and can quickly suppress harmful gases by forming a film in 15 minutes. Compared with the foam duration of the inhibitor in the prior art of 8 hours, the foam duration of the present invention is greater than 48 hours, and can better and more durably wrap the odorous soil, achieving more complete and longer-lasting odor isolation, and the ingredients used can be degraded in the natural environment, solving the problem of residual odor inhibitors.

[0069] The content of volatile organic matter in the contaminated soil in Table 1 is limited and will gradually decrease with volatilization, and the volatilized gas will escape into the atmosphere, so the concentration will decrease slightly after a period of time; secondly, the foam of the inhibitor has a certain adsorption effect on volatile organic matter.

[0070] Comparative experiment Experimental purpose: To verify that the odor inhibitor of the present invention has a more efficient and lasting odor suppression effect on contaminated soil compared with the prior art Experimental design: Two soil remediation odor inhibitors currently on the market were selected for comparative experiments with the odor inhibitor of the present invention, and a total volatile organic compound detector (TVOC) was used to detect the organic matter concentration of contaminated soil at different times when using different odor inhibitors. The soil remediation odor inhibitors selected on the market are Dongguan Wanqing Environmental Protection Co., Ltd., model WQ-8516 (Wanqing soil remediation odor inhibitor, foam type odor inhibitor) and Shanghai Qingxun Environmental Protection Technology Co., Ltd., model QXHB-NS (Qingxun soil remediation odor inhibitor, nano-film type odor inhibitor).

[0071] Experimental operation: The soil used in the experiment is volatile organic contaminated soil from a chemical accident site in Yancheng City. Take four portions of 400g of contaminated soil and put them into three 600ml (diameter: height = 8cm: 13cm) beakers respectively. Spray the odor inhibitor of Example 1 with a thickness of 2.0cm, the soil remediation odor inhibitor of Dongguan Wanqing Environmental Protection Co., Ltd. with a thickness of 2.0cm, and the soil remediation odor inhibitor of Shanghai Qingxun Environmental Protection Technology Co., Ltd. with a thickness of 2.0cm (the labels are S1, S2 and S3 respectively), and the other portion is not treated (labeled S0). Use TVOC to detect the concentration of volatile organic matter at the mouth of the beaker at intervals, and observe the foam duration and film-forming effect during this period.

[0072] Experimental results:

[0073] (1) Concentration of volatile organic compounds (mg / m 3 )

[0074] Table 1 Concentration of volatile organic compounds in each experimental group at different times (mg / m3)

[0075]

[0076] (2) Film formation time and foam duration

[0077] The odor inhibitor foam of Example 1 starts to form a film in 10-15 minutes, and the foam lasts for more than 48 hours (exceeding the test time). As the water in the foam gathers inward, under the action of the film-forming agent, the film takes 3.5-4 hours from the beginning to the complete formation; Dongguan Wanqing Environmental Protection Co., Ltd., the Wanqing soil remediation odor inhibitor model WQ-8516, starts to form a film in 1-1.5 hours, the film is formed from the beginning to the complete formation of 4.5-5 hours, and the foam lasts for 6.0-6.5 hours; Shanghai Qingxun Environmental Protection Technology Co., Ltd., the soil remediation odor inhibitor model QXHB-NS starts to form a film in 30 minutes to 1 hour, and the film is formed from the beginning to the complete formation of 7-8 hours. Compared with the foam-type odor inhibitor in the prior art, the foam of the present invention forms a film more quickly, and the foam lasts much longer than the existing inhibitors, which can better and more lastingly wrap the odorous soil, and achieve more complete and lasting odor isolation. The film-forming time is shorter, and the odor can be blocked more quickly and efficiently. In addition, the inhibitor of the present invention is simple to prepare, inexpensive, easy to store, and simple and easy to use.

[0078] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. An odor suppressant based on a fluorocarbon-hydrocarbon binary surfactant, characterized in that: The odor suppressant comprises the following components by mass percentage: 0.5%-1.5% fluorocarbon surfactant, 2.0%-4.0% dodecyl betaine, 15.0%-25.0% polyvinyl alcohol, 1.0%-3.0% sodium carboxymethyl cellulose, 1.0%-3.0% xanthan gum, 2.0%-3.0% alkyl glycoside, 1.0%-2.0% ammonium sulfate, and the balance is water. The sum of the mass percentages of the above components is 100%. The fluorocarbon surfactant is a perfluorinated branched short-chain anionic surfactant containing a double hydrophobic fluorocarbon chain, and its structure is as follows: 。 2. The odor suppressant based on fluorocarbon-hydrocarbon binary surfactant according to claim 1, characterized in that: The odor suppressant comprises the following components by mass percentage: 1.0% fluorocarbon surfactant, 3.0% dodecyl betaine, 20.0% polyvinyl alcohol, 2.0% sodium carboxymethyl cellulose, 2.0% xanthan gum, 2.5% alkyl glycoside, 1.5% ammonium sulfate and 68% water.

3. The odor suppressant based on fluorocarbon-hydrocarbon binary surfactant according to claim 1, characterized in that: The water is pure water with a pH value of 6.5-8.

5.

4. The odor suppressant based on fluorocarbon-hydrocarbon binary surfactant according to claim 1, characterized in that: The polyvinyl alcohol is PVA-124, and the viscosity of the sodium carboxymethyl cellulose is 600-1000 mPa·s.

5. The odor suppressant based on fluorocarbon-hydrocarbon binary surfactant according to claim 1, characterized in that: The dodecyl betaine is dodecyl dimethyl betaine; and the alkyl glycoside is alkyl glycoside 0810.

6. The method for preparing an odor suppressant based on a fluorocarbon-hydrocarbon binary surfactant according to claim 1, characterized in that: The specific steps include: (1) Prepare water, add polyvinyl alcohol and sodium carboxymethyl cellulose to the water, stir evenly at room temperature, and stir for 20-40 minutes; (2) heating the mixture in step (1) to 70-80°C, adding ammonium sulfate, and stirring for 20-30 minutes; (3) Dissolve xanthan gum, dodecyl betaine, alkyl glycoside and fluorocarbon surfactant in water and stir for 5-15 minutes; (4) Add the liquid obtained in step (3) to the mixed solution obtained in step (2), and stir for 5-15 minutes to obtain the odor suppressant.

7. The method for preparing an odor suppressant based on a fluorocarbon-hydrocarbon binary surfactant according to claim 6, characterized in that: The stirring time in step (1) is 30 min.

8. The method for preparing an odor suppressant based on a fluorocarbon-hydrocarbon binary surfactant according to claim 6, characterized in that: The heating temperature in step (2) is 75° C. and the stirring time is 25 min.

9. The method for preparing an odor suppressant based on a fluorocarbon-hydrocarbon binary surfactant according to claim 6, characterized in that: The stirring time in step (3) is 10 min; the stirring time in step (4) is 10 min.

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