A surfactant composition and its preparation method and application

Abstract

The invention discloses a surfactant composition and a preparation method and application thereof, belonging to the technical field of waste gas treatment; the surfactant composition provided by the invention comprises the following components by weight: 8-32 parts of liquid paraffin, 0.8-12 parts of OP emulsifier, 0.3-6 parts of fatty acid methyl ester ethoxylate sulfonate, 0.2-3 parts of co-surfactant, 0.5-3 parts of buffer, and 60-80 parts of water; the number of carbon atoms in the liquid paraffin is 9-13. The surfactant composition provided by the invention has excellent absorption capacity for various waste gases in the plastic processing process, especially organic waste gases in the flame retardant ABS modified plastic processing process, and has a large saturated absorption capacity for main or characteristic organic waste gases.

Description

Technical Field

[0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a surfactant composition and a preparation method and application thereof. Background Art

[0002] During the processing and molding of the plastics industry, due to the high extrusion temperature, the residues in the resin will evaporate, and some flame retardants and antioxidants in the plastics may also degrade. In addition, some oligomers in the plastics and paraffin oil and lubricants used for dispersion may also be brought out with the smoke and become part of the exhaust gas. The above-mentioned exhaust gas is one of the important sources of air pollution and has adverse effects on the living environment and health of human beings. Therefore, the treatment of organic waste gas in the plastic materials industry has always been a research hotspot.

[0003] At present, the treatment of organic waste gas is mainly based on the composition of the waste gas and the amount of production. Different waste gas treatment devices are configured. Common waste gas treatment processes mainly include four parts: condensation device, spray device, waste gas absorption device and combustion device; among them, spray device and absorption device are the most widely used. The spray solution in the spray tower installed by different manufacturers is mainly divided into three types: circulating water, alkali solution and acid solution; however, the above three types have poor removal effects on waste gas containing a large amount of volatile organic compounds (VOCs). The main reason is that VOCs are mainly benzene, aldehydes, ketones, alkanes, phenols, and halogen-containing organic matter, which are hydrophobic components and have low solubility in water / acid solution / alkaline solution. Therefore, for the treatment of waste gas containing a large amount of VOCs, it is necessary to increase the solubility of organic matter in the spray solution and improve the removal rate of organic waste gas. The basic principle of the absorption method is to absorb and treat VOCs-containing waste gas through the principle of like dissolves like and the double-membrane mass transfer theory. It is a fast and efficient treatment method. However, the absorption method existing in the prior art has a series of problems. For example, patent CN108905516A discloses a microemulsion absorption liquid for treating "triphenyl" organic waste gas, which uses a microemulsion absorption liquid to treat benzene, toluene and xylene in the waste gas. The main components of the microemulsion are water, a mixed oil phase and a non-ionic surfactant. However, the waste water generated by the waste gas treatment using the microemulsion in this method needs to be fractionated and then recycled. The process equipment and recycling costs involved are high, and it is difficult to put it into large-scale use. In addition, the types of organic waste gas in the plastics industry are complex. This method cannot effectively reduce the concentration of multiple VOCs. Therefore, it cannot be applied to the waste gas generated in the plastic preparation process. For another example, patent CN115888331A discloses a VOCs absorbent and a preparation method thereof, in which a surfactant containing biodiesel with a high boiling point and low volatility, dimethyl silicone oil, a Span series surfactant and a TX series surfactant is used to treat toluene in the exhaust gas; however, the wastewater generated by the exhaust gas treatment using the surfactant solution in this method contains a large amount of dimethyl silicone oil, and the discharged absorption liquid waste is easy to pollute the environment; although heating distillation can be used to recover VOCs and regenerate the absorbent, there are problems of high energy consumption and secondary pollution.

[0004] That is, the prior art does not provide a technical solution that can effectively and environmentally absorb waste gas during the plastic processing and manufacturing process, and there is no research on waste gas during the processing of specific types of plastics. Modified ABS plastics, especially flame-retardant ABS modified plastics, not only have the advantages of high impact strength, good low temperature resistance, and easy processing and molding, but also have good flame retardancy; therefore, they are widely used in the fields of home appliances, automobiles, etc.; however, during the co-extrusion processing, injection molding or regeneration processing of flame-retardant ABS modified plastics, a large amount of organic waste gas will be generated, in addition to the organic waste gas containing benzene rings such as styrene, toluene, xylene, ethylbenzene, benzaldehyde, benzoic acid, etc. generated in the production of conventional polystyrene plastics, due to the structural characteristics of ABS plastics, nitrile and other organic waste gases will be generated, such as acrylonitrile, α-naphthyl acetonitrile and other substances. Therefore, how to provide a method that can effectively and environmentally absorb waste gas during the processing and manufacturing of plastics, especially flame-retardant ABS modified plastics, has become a research hotspot. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a surfactant composition that can be effectively used to absorb waste gas generated during the processing of plastics, especially flame-retardant ABS modified plastics.

[0006] To achieve the above object, in a first aspect of the present invention, the present invention provides a surfactant composition, the surfactant composition comprising the following components in parts by weight:

[0007] 8-32 parts of liquid paraffin, 0.8-12 parts of OP emulsifier, 0.3-6 parts of fatty acid methyl ester ethoxylate sulfonate, 0.2-3 parts of co-surfactant, 0.5-3 parts of buffer, 60-80 parts of water;

[0008] The number of carbon atoms in the liquid paraffin is 9-13.

[0009] The surfactant composition provided by the present invention selects water and liquid paraffin with carbon atoms of 9-13 as two-phase solvents, and adds specific surfactants, namely OP emulsifier and fatty acid methyl ester ethoxylate sulfonate, and can be effectively used for absorbing waste gas generated in the process of plastic processing in cooperation with a co-surfactant and a buffer. In particular, it can be well used for absorbing waste gas in the process of various flame-retardant ABS modified plastics. Moreover, after the surfactant composition provided by the present invention absorbs organic waste gas, there is a density difference between the liquid paraffin with carbon atoms of 9-13 and VOCs, so stratification occurs, and organic components can be transferred to the upper layer. Subsequently, the absorbed organic waste gas components can be transferred faster by physical methods, and the energy consumption of distillation separation from the surfactant aqueous solution is reduced. The separated water phase can be recycled and reused. That is, the surfactant composition provided by the present invention can achieve the purpose of simple and environmentally friendly absorption of organic waste gas.

[0010] Specifically, the present invention selects liquid paraffin with carbon number of 9-13, which has excellent fluidity and can reduce the pressure in the absorption process. The liquid paraffin with excellent fluidity can cooperate with OP emulsifier and fatty acid methyl ester ethoxylate sulfonate to ensure that OP emulsifier and fatty acid methyl ester ethoxylate sulfonate form a better affinity with nitrile substances in the process of flame-retardant ABS modified plastics, so as to achieve the effect of absorbing nitrile substances. On the basis of being able to absorb specific nitrile substances generated in the process of flame-retardant ABS modified plastics, the surfactant composition of the present invention also has a good absorption capacity for other types of waste gas generated in the process of plastics processing, such as benzene series (such as styrene, ethylbenzene, xylene, etc.), aldehydes and ketones (such as formaldehyde, acetaldehyde, acrolein, etc.), styrene oligomers, phenols, benzene-containing long-chain alkanes, benzoic acids, etc. In addition, the surfactant composition of the present invention also has a good absorption capacity for organic waste gas such as hydrogen chloride and phthalates generated in the process of other types of plastics such as modified polyvinyl chloride. At the same time, the surfactant provided by the present invention has simple and clear ingredients, little odor, is easy to obtain, and has low cost, which is conducive to actual production.

[0011] For example, the number of parts of the liquid paraffin can be any point value or any two point range values ​​between 8-32 parts, such as 10-30 parts, or 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, etc. ; The OP emulsifier can be any point value or any range value between 0.8-12, such as 1-10 parts, or 0.8 parts, 1 parts, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, etc.; The fatty acid methyl ester ethoxylate sulfonate can be any point value or any range value between 0.3-6 parts, such as 0.5-5 parts, or 0.3 parts, 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, etc.; the co-surfactant can be any point value or any two point range value between 0.2-3 parts, such as 0.2 parts, 0.3 parts, 0.5 parts, 0.7 parts, 0.9 parts, 1.1 parts, 1.3 parts, 1.5 parts, 1.7 parts, 1.9 parts, 2.1 parts, 2.3 parts, 2.5 parts, The buffer can be any point value between 0.5-3 parts or any range of two points, such as 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, etc.; the water can be any point value between 60-80 parts or any range of two points, such as 60 parts, 62 parts, 64 parts, 66 parts, 68 parts, 70 parts, 72 parts, 74 parts, 76 parts, 78 parts, 80 parts, etc.

[0012] In the surfactant composition, the mass percentage of liquid paraffin is greater than 6%.

[0013] As a preferred embodiment of the surfactant of the present invention, the surfactant composition comprises the following components in parts by weight:

[0014] 14-25 parts of liquid paraffin, 2-6 parts of OP emulsifier, 1-4 parts of fatty acid methyl ester ethoxylate sulfonate, 0.8-2 parts of co-surfactant, 1-2 parts of buffer, and 60-80 parts of water.

[0015] The present invention has found that the mass parts of the components in the surfactant composition will have a significant effect on the performance of the product. When the mass parts of the components in the composition are further selected to be within the above range, the obtained product has a higher absorption rate for various organic waste gases, and a greater absorption saturation amount for the main organic waste gases (including benzene ring organic waste gases) and unique organic waste gases (nitrile organic waste gases) in flame-retardant ABS modified plastics.

[0016] As a preferred embodiment of the surfactant of the present invention, the mass ratio of liquid paraffin, OP emulsifier and fatty acid methyl ester ethoxylate sulfonate is 1: (0.12-0.26): (0.05-0.18).

[0017] Exemplarily, the mass ratio of the liquid paraffin, OP emulsifier and fatty acid methyl ester ethoxylate sulfonate can be any point value or any two point range values ​​between 1: (0.12-0.26): (0.05-0.18), such as 1:0.12:0.05, 1:0.12:0.1, 1:0.12:0.15, 1:0.12:0.18, 1:0.14:0.05, 1:0.14:0.1, 1:0.14:0.15, 1:0.14:0.18, 1:0.18:0. :0.05, 1:0.18:0.1, 1:0.18:0.15, 1:0.18:0.18, 1:0.22:0.05, 1:0.32:0.1, 1:0.22:0.15, 1:0.22:0.18, 1:0.24:0.05, 1:0.24:0.1, 1:0.24:0.15, 1:0.24:0.18, 1:0.26:0.05, 1:0.26:0.1, 1:0.26:0.15, 1:0.26:0.18, etc.

[0018] The present invention has found that the mass ratio of liquid paraffin, OP emulsifier and fatty acid methyl ester ethoxylate sulfonate will affect the absorption performance of the product. When the mass ratio of the three is further selected to be within the above range, the synergistic effect of the three is better and the absorption rate of organic waste gas is higher.

[0019] As a preferred embodiment of the surfactant composition of the present invention, the OP emulsifier includes at least one of OP-10, OP-7 and OP-12.

[0020] The present invention has found that the OP emulsifier can interact with liquid paraffin and fatty acid methyl ester ethoxylate sulfonate, thereby improving the absorption capacity of different types of organic waste gases, especially the absorption of nitrile organic waste gases generated in the preparation process of flame-retardant ABS modified plastics; when the OP emulsifier is further selected as at least one of OP-10, OP-7, and OP-12, the comprehensive performance of the obtained product is better.

[0021] As a preferred embodiment of the surfactant composition of the present invention, the co-surfactant includes at least one of isopropyl alcohol, glycerol, butanediol, dimethylformamide, and N-methylpyrrolidone.

[0022] As a preferred embodiment of the surfactant composition of the present invention, the co-surfactant is glycerol and butylene glycol, and the mass ratio of glycerol to butylene glycol is 1:(0.5-1.5).

[0023] The present invention has found that the type of co-surfactant will affect the product's ability to absorb organic waste gas. When the co-surfactant is further selected as the above-mentioned type of substance, the obtained product has better absorption capacity for various organic waste gases; especially when the co-surfactant is further selected as a mixture of propylene glycol and butylene glycol in a mass ratio of 1: (0.5-1.5), the comprehensive performance of the obtained product is better.

[0024] Exemplarily, the mass ratio of propylene glycol to butanediol can be any point value or any two point range value between 1:(0.5-1.5), such as 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, etc.

[0025] As a preferred embodiment of the surfactant of the present invention, the buffer includes at least one of citric acid, sodium hydroxide, potassium hydroxide, sodium citrate, sodium bicarbonate, sodium carbonate, dipotassium hydrogen phosphate, and potassium dihydrogen phosphate.

[0026] Preferably, the buffer includes any one of citric acid and dipotassium hydrogen phosphate; or the buffer includes any one of sodium hydroxide, potassium hydroxide, sodium citrate, sodium bicarbonate, sodium carbonate, and potassium dihydrogen phosphate; or the buffer includes a mixture of any one of citric acid and dipotassium hydrogen phosphate and any one of sodium hydroxide, potassium hydroxide, sodium citrate, sodium bicarbonate, sodium carbonate, and potassium dihydrogen phosphate.

[0027] In the second aspect of the present invention, the present invention also provides a method for preparing the surfactant composition, which comprises the following steps: mixing liquid paraffin, OP emulsifier and co-surfactant, adding fatty acid methyl ester ethoxylate sulfonate, buffer and water and mixing evenly to obtain a surfactant composition.

[0028] In the third aspect of the present invention, the present invention also provides the use of the surfactant composition in absorbing waste gas generated in the process of plastic preparation.

[0029] As a preferred embodiment of the application of the present invention, the plastic includes any one of flame-retardant ABS modified plastic, polystyrene plastic, polyoxymethylene plastic, and polyvinyl chloride plastic.

[0030] As a preferred embodiment of the application of the present invention, the plastic is flame-retardant ABS modified plastic.

[0031] Illustratively, the flame-retardant ABS modified plastic includes ABS resin, brominated flame retardant / organophosphate flame retardant, antioxidant, lubricant, white mineral oil dispersant, ultraviolet absorber, organic colorant / carbon black, etc.

[0032] The present invention has been found through research that the surfactant composition provided by the present invention can effectively absorb various types of VOCs, such as benzene series (such as styrene, ethylbenzene, xylene, etc.), aldehydes and ketones (such as formaldehyde, acetaldehyde, acrolein, etc.), styrene oligomers, phenols, benzene-containing alkanes, benzoic acid, brominated substances, and nitriles (such as acrylonitrile, α-naphthylacetonitrile, etc.); therefore, the surfactant composition can be widely used in the absorption of organic waste gas generated in the process of plastic processing, especially can be effectively used in the absorption of organic waste gas generated in the process of flame-retardant ABS modified plastic processing or recycling.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The surfactant composition provided by the present invention can be effectively used for absorbing waste gas generated in the process of plastic processing by selecting water and liquid paraffin with carbon atoms of 9-13 as two-phase solvents, adding specific surfactants, namely OP emulsifier and fatty acid methyl ester ethoxylate sulfonate, in the cooperation of co-surfactant and buffer, and can be used for absorbing waste gas generated in the process of plastic processing, especially can be used for absorbing waste gas in various flame-retardant ABS modified plastic processing processes; and the surfactant composition provided by the present invention is initially a microemulsion with uniform phase state, and the oil phase realizes automatic stratification after absorbing a certain amount of organic waste gas, and the organic components can be transferred to the upper layer, and the absorbed organic waste gas components can be transferred quickly by physical methods later, reducing the energy consumption of distillation separation from the surfactant aqueous solution, and the separated water phase can be recycled, that is, the surfactant composition provided by the present invention can realize simple and environmentally friendly absorption of organic waste gas. At the same time, the surfactant provided by the present invention has simple and clear ingredients, small odor, simple acquisition, low cost, and is conducive to actual production. DETAILED DESCRIPTION

[0035] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0036] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0037] Liquid paraffin 1: carbon number 9, normal nonane, Tianjin Kemiou Chemical Reagent Co., Ltd.;

[0038] Liquid paraffin 2: carbon number 13, normal tridecanane, Tianjin Komiou Chemical Reagent Co., Ltd.;

[0039] Liquid paraffin 3: carbon number 7, n-heptane, Tianjin Komiou Chemical Reagent Co., Ltd.;

[0040] Liquid paraffin 4: carbon number is 15, normal pentadecane, Tianjin Komiou Chemical Reagent Co., Ltd.

[0041] Examples 1-13 and Comparative Examples 1-7

[0042] The component contents (parts by weight) of the surfactant compositions provided in the examples and comparative examples of the present invention are shown in Table 1-2;

[0043] Table 1

[0044]

[0045] Table 2

[0046]

[0047] The preparation method of the surfactant composition provided in Example 1 is:

[0048] Liquid paraffin, OP emulsifier and co-surfactant were mixed and stirred at a speed of 150 rpm to mix evenly, and then fatty acid methyl ester ethoxylate sulfonate, buffer and water were added and stirred at a speed of 300 rpm to mix evenly to obtain a surfactant composition.

[0049] The preparation methods of the surfactant compositions of Examples 2-13 and Comparative Examples 1-7 are consistent with that of Example 1, except that no relevant components are added.

[0050] Effect Example 1

[0051] The effect examples of the present invention verify the absorption performance of the surfactants prepared in Examples 1-13 and Comparative Examples 1-7 on organic waste gas. 3 Organic waste gas (collected during the processing of flame-retardant ABS modified plastics, composed of benzene, ethylbenzene, toluene, xylene, styrene, acetaldehyde, acetone, tribromophenol, stearate, styrene dimer, benzoic acid, butyl benzyl phthalate, acrylonitrile, α-naphthyl acetonitrile, etc.) with a volume of 6 m 3 / h, respectively, and the liquid-gas ratio was controlled to be 15 L / m 3, the absorption efficiency of organic waste gas is shown in Table 3-4; wherein, the calculation method of absorption efficiency is: using the air volume of 0.5m / s, the gas time of 30min and the theoretical air volume calculated according to the area of ​​the ventilation pipe to obtain the theoretical volume of waste gas introduced, then multiply the calculated theoretical volume of waste gas introduced by the mass concentration of the organic waste gas inlet to obtain the theoretical weight of the organic waste gas introduced, and then multiply the organic waste gas concentration at the outlet by the waste gas volume to obtain the weight of the organic waste gas not absorbed at the outlet, therefore, the organic waste gas absorption efficiency in Table 3-4 = (theoretical weight of organic waste gas introduced - weight of organic waste gas not absorbed at the outlet) / theoretical weight of organic waste gas introduced * 100%;

[0052] Table 3

[0053]

[0054] Table 4

[0055]

[0056] It can be seen from Table 3-4 that when the technical solution of the present invention is adopted, the obtained product has excellent absorption capacity for various substances in organic waste gas, the absorption efficiency is above 72%, and the total absorption efficiency is above 80%;

[0057] It can be seen from Examples 1-5 and Comparative Examples 1-2 that the mass fraction of the components in the surfactant composition will have a significant effect on the absorption efficiency. When the mass fraction of the components is further selected to be within the preferred range, the total absorption efficiency of the obtained surfactant is above 90%, and the absorption efficiency for each substance is above 84%; and when the mass fraction of the components in Comparative Examples 1-2 is not within the range given by the present invention, the total absorption capacity of the obtained product shows a significant downward trend, and the adsorption capacity for each substance also decreases significantly; It can be seen from Examples 1 and 6 that the mass ratio of liquid paraffin, OP emulsifier and fatty acid methyl ester ethoxylate sulfonate in the components will also affect the performance of the product. When the total mass fraction of the three in Example 6 remains unchanged but the mass ratio changes, the absorption capacity of the obtained product shows a downward trend, especially the absorption capacity for acrylonitrile and α-naphthyl acetonitrile decreases;

[0058] It can be seen from Example 1, Example 7 and Comparative Examples 3-4 that the selection of liquid paraffin will significantly affect the performance of the product. When the number of carbon atoms of the liquid paraffin used in Comparative Examples 3-4 is not within the range given by the present invention, good absorption capacity cannot be achieved, and the absorption capacity of the obtained product for most types of organic waste gas is significantly reduced; it can be seen from Example 1, Examples 8-10 and Comparative Examples 5-6 that the selection of emulsifier is more critical. When the OP emulsifier selected in Example 10 is also a preferred type of emulsifier of the present invention, the absorption capacity of the obtained product for certain types of organic waste gas is significantly reduced, especially the absorption capacity for acrylonitrile and α-naphthyl acetonitrile is significantly reduced, but it is still better than the comparative example and can meet the application requirements. When the OP emulsifier selected in Example 10 is not a preferred type of the present invention, the absorption capacity of the obtained product for certain types of organic waste gas is significantly reduced, especially the absorption capacity for acrylonitrile and α-naphthyl acetonitrile is significantly reduced, but it is still better than the comparative example and can meet the application requirements. When other types of emulsifiers are selected in Example 6, the total absorption capacity of the obtained product and the absorption capacity for acrylonitrile and α-naphthyl acetonitrile are significantly reduced; it can be seen from Example 1 and Examples 11-13 that the selection of co-surfactant will also affect the comprehensive performance of the product. When the co-surfactant is further preferably a mixture of propylene glycol and butanediol, and the mass ratio of the two is 1: (0.5-1.5), the comprehensive effect of the obtained product is excellent; it can be seen from Example 1 and Comparative Example 7 that when other types of sulfonate ionic surfactants are used to replace the fatty acid methyl ester ethoxylate sulfonate in the present invention, the absorption capacity of the obtained product for all types of organic waste gases is reduced, especially the absorption capacity for acrylonitrile and α-naphthyl acetonitrile is significantly reduced.

[0059] Effect Example 2

[0060] The present invention verifies the saturated absorption capacity of the surfactant composition prepared in the embodiment and the comparative example to toluene, acrylonitrile and α-naphthylacetonitrile. Taking toluene as an example, the present invention comprises the following steps: adding 6 m 3 / h and 600 mg / m 3 Toluene organic waste gas, control the liquid-gas ratio to 15 L / m 3 , until the weight of the surfactant composition no longer changes, it is considered that saturated absorption is reached, and the saturated absorption amount is calculated based on the difference in weight before and after; the results are shown in Table 5; the saturated absorption amounts of acrylonitrile and α-naphthylacetonitrile refer to the test method of toluene;

[0061] Table 5

[0062]

[0063] It can be clearly seen from Table 5 that when the technical scheme of the present invention is adopted, the saturated absorption capacity of the obtained product for toluene, acrylonitrile and α-naphthylacetonitrile is high, which is above 9.42g / 100g, above 8.28g / 100g and above 8.32g / 100g, respectively.

[0064] Finally, it should be noted that the above embodiments are intended to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A surfactant composition, characterized in that The surfactant composition comprises the following components in parts by weight: 8-32 parts of liquid paraffin, 0.8-12 parts of OP emulsifier, 0.3-6 parts of fatty acid methyl ester ethoxylate sulfonate, 0.2-3 parts of co-surfactant, 0.5-3 parts of buffer, 60-80 parts of water; The number of carbon atoms in the liquid paraffin is 9-13.

2. The surfactant composition according to claim 1, characterized in that The surfactant composition comprises the following components in parts by weight: 14-25 parts of liquid paraffin, 2-6 parts of OP emulsifier, 1-4 parts of fatty acid methyl ester ethoxylate sulfonate, 0.8-2 parts of co-surfactant, 1-2 parts of buffer, and 60-80 parts of water.

3. The surfactant composition according to claim 1, characterized in that The mass ratio of liquid paraffin, OP emulsifier and fatty acid methyl ester ethoxylate sulfonate is 1:(0.12-0.26):(0.05-0.18).

4. The surfactant composition according to claim 1, characterized in that The OP emulsifier includes at least one of OP-10, OP-7 and OP-12.

5. The surfactant composition according to claim 1, characterized in that The co-surfactant includes at least one of isopropyl alcohol, glycerol, butanediol, dimethylformamide and N-methylpyrrolidone.

6. The surfactant composition according to claim 5, characterized in that The auxiliary surfactant is propylene glycol and butylene glycol, and the mass ratio of propylene glycol to butylene glycol is 1:(0.5-1.5).

7. The surfactant composition according to claim 1, characterized in that The buffer comprises at least one of citric acid, sodium hydroxide, potassium hydroxide, sodium citrate, sodium bicarbonate, sodium carbonate, dipotassium hydrogen phosphate, and potassium dihydrogen phosphate.

8. The method for preparing the surfactant composition according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: mixing liquid paraffin, OP emulsifier and auxiliary surfactant, adding fatty acid methyl ester ethoxylate sulfonate, buffer and water and mixing evenly to obtain a surfactant composition.

9. Use of the surfactant composition as described in any one of claims 1 to 7 in absorbing waste gas generated in the process of plastic preparation.

10. The use according to claim 9, characterized in that: The plastic is flame retardant ABS modified plastic.

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