Method for screening key peculiar smell capturing target in polyvinyl chloride artificial leather

Abstract

The invention relates to the technical field of peculiar smell recognition, in particular to a method for screening key peculiar smell capturing targets in polyvinyl chloride artificial leather. The method comprises the following steps: adsorbing and enriching volatile organic compounds in a pretreated polyvinyl chloride artificial leather sample by using a sampling tube filled with filler; carrying out thermal desorption on the volatile organic compounds adsorbed and enriched by the sampling tube by using a thermal desorption technology, carrying out qualitative analysis and quantitative analysis on the volatile organic compounds by combining a gas chromatography-mass spectrometry technology, and obtaining olfaction information of the corresponding volatile organic compounds by using a gas chromatography olfaction technology; and when the odor activity value of the volatile organic compound is greater than or equal to 1 and the dilution factor of the volatile organic compound is greater than or equal to 64, determining that the volatile organic compound is the key odor capture target in the polyvinyl chloride artificial leather. The method can effectively reduce deviation caused by judgment only depending on the types or contents of the components, so that a reliable target basis is provided for capturing and controlling the peculiar smell of the polyvinyl chloride artificial leather.

Description

Technical Field

[0001] This invention relates to the field of odor identification technology, and in particular to a method for screening key odor-capturing targets in polyvinyl chloride artificial leather. Background Technology

[0002] With the development of the automotive industry and consumers' increasing attention to in-car air quality, the odor of automotive interior materials has gradually become an important factor affecting ride comfort and product competitiveness. Polyvinyl chloride (PVC) artificial leather is widely used in car seats, door panels, and dashboards due to its advantages such as wear resistance, aging resistance, and controllable cost. However, it emits a foul and irritating odor at room temperature. This odor can affect the health and mood of passengers, with more than half of users reporting headaches, nausea, and other discomfort due to in-car odors. Therefore, accurately analyzing which substances produce the odor is essential.

[0003] Current research on the odor problem of polyvinyl chloride (PVC) artificial leather mainly focuses on the detection and identification of volatile odor substances. Dozens or even hundreds of volatile components can be detected using adsorption-thermal desorption combined with gas chromatography-mass spectrometry (GC-MS). However, research and practice show that not all detected volatile odor substances contribute substantially to the overall odor of the material. Some volatile substances with higher content may have a high odor threshold and limited impact on sensory odor, while certain substances with lower content but stronger odor activity may dominate the odor characteristics of the material.

[0004] In existing odor control practices, if odor improvement plans are formulated solely based on the types or relative contents of volatile components in the test results, it is often difficult to identify which odor substances should be the primary targets for control. This leads to insufficient targeting of subsequent odor capture, suppression, or replacement measures, limiting the efficiency and stability of the control efforts. Patent CN108918724A discloses a method for detecting the characteristic odor of polyurethane synthetic leather, which uses adsorption thermal desorption technology combined with gas chromatography-mass spectrometry to detect and identify characteristic odor substances in polyurethane synthetic leather. This method can detect volatile odor substances in samples and has good detection efficiency and reliability. However, its main technical purpose is to "detect characteristic odor substances," still focusing on the discovery and characterization of odor substances. For the overall odor of the material, this method has not further distinguished the contribution of different odor substances to the overall odor, nor has it established key target screening rules for subsequent odor capture and control. Therefore, it is difficult to directly answer the question of "which odor substances should be prioritized for control."

[0005] Therefore, there is an urgent need for a technical method that can identify key odor targets in polyvinyl chloride (PVC) artificial leather that play a decisive role in the overall odor and are suitable as targets for subsequent odor capture or control. This provides an important reference for effectively removing a specific substance that is harmful to human health, provides theoretical support for manufacturers to carefully select green additives for the manufacture of PVC artificial leather, and helps to reduce the odor of PVC artificial leather from the source, thereby improving the air quality inside the vehicle. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a method for screening key odor-capturing targets in polyvinyl chloride (PVC) artificial leather. This invention utilizes gas chromatography-mass spectrometry-olfactometry (GC-MS-O) combined with odor activity value (OAV) and odor extract dilution analysis (OEDA) to screen key odor substances from PVC artificial leather that significantly contribute to the overall odor and are suitable for subsequent odor capture and control. By combining objective instrumental analysis with olfactory evaluation, and achieving repeatable determination of dilution factors through programmed splitting, the bias caused by relying solely on component type or content can be effectively reduced, thus providing a reliable target basis for odor capture and control in PVC artificial leather.

[0007] The objective of this invention can be achieved through the following technical solutions: This invention provides a method for screening key odor-capturing targets in polyvinyl chloride (PVC) artificial leather, comprising the following steps: (S1) The pretreated polyvinyl chloride artificial leather sample was subjected to adsorption and enrichment of volatile organic compounds using a sampling tube filled with packing material; One end of the sampling tube is connected to a sampling bottle containing the sample, and the other end is connected to an atmospheric sampling pump. (S2) Thermal desorption technology is used to thermally desorb the volatile organic compounds adsorbed and enriched in the sampling tube, and gas chromatography-mass spectrometry is used to perform qualitative and quantitative analysis of the volatile organic compounds. At the same time, olfactory information of the corresponding volatile organic compounds is obtained through gas chromatography-olfactory technology. (S3) Based on the odor activity value method and odor extract dilution analysis method, volatile organic compounds were comprehensively evaluated, and key odor capture targets that significantly contribute to the overall odor of polyvinyl chloride artificial leather were screened.

[0008] In one embodiment of the present invention, the preprocessing in step (S1) specifically includes the following: Cut the polyvinyl chloride artificial leather sample into pieces of 0.3–0.7 cm. 3 Small fragments.

[0009] In one embodiment of the present invention, in step (S1), during the adsorption enrichment process, the sample size of the polyvinyl chloride artificial leather sample is 5~10 g, the temperature is 23~100 ℃, and the time is 30~60 min.

[0010] In one embodiment of the present invention, in step (S1), the filler is selected from Tenax TA or Tenax GR.

[0011] In one embodiment of the present invention, in step (S2), the heating procedure during thermal desorption is as follows: The initial temperature was 38~42 ℃, held for 0.4~0.6 min, and then increased to 235~245 ℃ at a rate of 115~125 ℃ / min, held for 7~9 min. Preferably, the initial temperature is 40 °C, held for 0.5 min, and then increased to 240 °C at a rate of 120 °C / min, held for 8 min.

[0012] In one embodiment of the present invention, in step (S2), the gas chromatography-mass spectrometry (GC-MS) technique is specifically performed as follows: Chromatographic conditions: HP-5ms capillary column, 30 m * 0.25 mm * 0.25 μm; Temperature program: Initial temperature 38–42 °C, hold for 1.6–2.4 min, increase to 93–97 °C at 5–7 °C / min, do not hold, then increase to 155–165 °C at 1.5–2.5 °C / min, hold for 1.5–2.5 min, and finally increase to 225–235 °C at 4–6 °C / min, hold for 8–12 min; Carrier gas: helium, flow rate 1.1–1.3 mL / min, splitless injection. Preferably, the chromatographic conditions are as follows: HP-5ms capillary column, 30 m * 0.25 mm * 0.25 μm; temperature program: initial temperature 40 ℃, hold for 2 min, increase to 95 ℃ at 6 ℃ / min, do not hold, then increase to 160 ℃ at 2 ℃ / min, hold for 2 min, and finally increase to 230 ℃ at 5 ℃ / min, hold for 10 min; the carrier gas is helium, the carrier gas flow rate is 1.2 mL / min, and the injection method is splitless injection. Mass spectrometry conditions: EI ion source; electron energy 68~72 eV; transfer line temperature 245~255 ℃; ion source temperature 225~235 ℃; quadrupole temperature 145~155 ℃; mass scan range 30~450 amu; solvent delay 3~4 min; Preferably, the mass spectrometry conditions are as follows: EI ion source; electron energy 70 eV; transfer line temperature 250 ℃; ion source temperature 230 ℃; quadrupole temperature 150 ℃; mass scan range of 30~450 amu; solvent delay 3.5 min.

[0013] In one embodiment of the present invention, the qualitative analysis in step (S2) is as follows: The obtained volatile organic compound data were imported into the retrieval system, and the spectra were compared in the NIST 17 and Wiley 7n.1 standard spectral libraries. Qualitative analysis was then performed in conjunction with the retention index.

[0014] In one embodiment of the present invention, in step (S2), the internal standard method is used for calculation during quantitative analysis.

[0015] In one embodiment of the present invention, in step (S2), the gas chromatography-olfactometry (GC-O) technique is specifically as follows: A gas chromatograph was coupled to an olfactory detection port with a transmission temperature of 245–255 °C and an outlet temperature of 145–155 °C. Moist air at a flow rate of 45–55 mL / min was continuously injected into the olfactory detection port to quickly moisten the nasal cavity of the person smelling the odor. When the odor of volatile organic compounds was detected, the retention time, odor description, and odor intensity were recorded. Preferably, the transmission temperature of the olfactory detection port is 250 ℃ and the outlet temperature is 150 ℃; humid air at a flow rate of 50 mL / min is continuously injected into the olfactory detection port to quickly moisten the nasal cavity; 3 to 6 professionally trained olfactory personnel sniff at the olfactory detection port, and when the odor is perceived, the odor retention time (RT), odor description, and odor intensity (OI) are recorded.

[0016] In one embodiment of the present invention, in step (S3), the odor activity value method is to divide the concentration of volatile organic compounds obtained by quantitative analysis by the olfactory threshold concentration of the substance, and screen out volatile organic compounds with a ratio greater than 1. The odor extract dilution analysis method is achieved by adjusting the split ratio of the thermal desorption unit and the cooling syringe system. The split ratio is used for stepwise dilution in multiples of 2 to obtain the dilution factor (FD) of each volatile organic compound.

[0017] In one embodiment of the present invention, the key odor capture target is determined by a comprehensive assessment based on the odor activity value (OAV) and dilution factor evaluation results.

[0018] Patent CN108918724A targets polyurethane synthetic leather, whose material system, source of residual components and volatile odor characteristics are different from those of polyvinyl chloride artificial leather. Therefore, its detection approach cannot be directly applied to the determination of key odor targets in polyvinyl chloride artificial leather.

[0019] Compared with the prior art, the present invention has the following beneficial effects: (1) Clear target guidance: This invention screens the contribution of volatile organic compounds in polyvinyl chloride artificial leather by comprehensively considering the odor activity value and dilution factor of odor substances. It can accurately identify key odor substances that have a decisive influence on the overall odor, avoiding the bias caused by judging solely based on the type or content of volatile organic compounds.

[0020] (2) High recognition accuracy and good repeatability: This invention uses GC-MS-O and combined with programmed diversion to realize the dilution analysis of odor extracts, which effectively reduces human operation error and improves the accuracy and repeatability of the identification results of key odor substances.

[0021] (3) Strong application targeting: This invention focuses on the research of finished polyvinyl chloride artificial leather, without relying on the material preparation process. The key odor capture targets identified can be directly used to determine the odor control objects and guide the formulation of capture, suppression and alternative solutions, thereby improving the targeting and efficiency of odor control and having good engineering application value.

[0022] Furthermore, existing technologies typically focus on identifying the types and determining the content of volatile organic compounds (VOCs), or evaluating odor based on a single indicator. This makes it difficult to simultaneously consider both quantifiable concentration information and perceptible odor contribution within the same technical process, easily leading to biases such as "high content but insignificant odor contribution" or "low content but significant odor contribution." This invention, based on qualitative and quantitative analysis using GC-MS, introduces GC-O olfactory information and uses a comprehensive evaluation rule combining OAV and FD to screen key odor-capturing targets. This allows for the direct identification of key components that decisively contribute to the overall odor in finished PVC artificial leather samples, providing clear and actionable target information for subsequent odor capture, suppression, or alternative measures. Attached Figure Description

[0023] Figure 1 A graph showing the quantity and content of volatile organic compounds in various types of polyvinyl chloride (PVC) artificial leather; Figure 2 OAV-FD-OI multidimensional bubble diagram of key odor capture targets for polyvinyl chloride artificial leather. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] Unless otherwise specified, all reagents used in the following embodiments are commercially available reagents, and all detection methods and techniques used are conventional detection methods and techniques in the art.

[0026] Examples 1-16 This embodiment provides a method for screening key odor-capturing targets in polyvinyl chloride (PVC) artificial leather, specifically including the following steps: (1) Identification process of key odor targets Using commercially available finished polyvinyl chloride (PVC) artificial leather as the research object, we identified key odor-capturing targets that significantly contribute to the overall odor. The specific steps are as follows: (A) Aging treatment of Tenax TA sampling tubes: Tenax TA sampling tubes were aged using an aging apparatus before the experiment. High-purity nitrogen gas was introduced during the aging process, and the sampling tubes were placed in the aging apparatus. The aging temperature program was as follows: the initial temperature was 40 ℃, and the temperature was increased to 300 ℃ at a rate of 10 ℃ / min and held for 1 h to remove any background interference that may remain in the sampling tubes.

[0027] (B) Pretreatment of PVC artificial leather samples: Cut the PVC artificial leather into 0.5 cm pieces. 3 Weigh 10 g of small fragments and place them in a gas sampling bottle, along with an internal standard. Place the sampling bottle in a constant-temperature oil bath at 80 ℃. Connect one end of the TenaxTA sampling tube to the sampling bottle and the other end to the sampling pump. Turn on the sampling pump to perform dynamic sampling for 1 h at a temperature of 80 ℃ and a gas flow rate of 0.5 L / min, thereby achieving the full release and enrichment of volatile organic compounds in polyvinyl chloride artificial leather.

[0028] Table 1 Optimization results of various factors in pretreatment technology As shown in Table 1, the number of odor compounds and key odor compounds generally increased with the increase of sample amount, sampling temperature, and sampling time. When the sampling temperature reached 80 ℃, the number of key odor compounds tended to stabilize, and further increasing the temperature had no significant impact on the identification results of key odor capture targets. Considering the number of key odor targets identified, method stability, and experimental operability, a sample amount of 10 g, a sampling temperature of 80 ℃, and a sampling time of 1 h were selected as the preferred conditions (the conditions provided in Example 12).

[0029] (C) Thermal Desorption and Desorption of Sampling Tubes: The enriched Tenax TA sampling tubes were placed in the thermal desorption unit for thermal desorption. The thermal desorption temperature program was as follows: initial temperature 40 °C, held for 0.5 min, then increased to 240 °C at 120 °C / min, held for 8 min. The desorbed volatile organic compounds entered the cooling injection system, where they were frozen and accumulated at -50 °C (with liquid nitrogen purging), and then heated to 300 °C at 10 °C / s to rapidly release the volatile organic compounds into the analysis system.

[0030] (D) Analysis of volatile organic compounds using gas chromatography-mass spectrometry: Chromatographic conditions were as follows: HP-5ms capillary column (30 m * 0.25 mm * 0.25 μm); temperature program: initial temperature 40℃, hold for 2 min, increase to 95℃ at 6℃ / min, do not hold, increase to 160℃ at 2℃ / min, hold for 2 min, and finally increase to 230℃ at 5℃ / min, hold for 10 min; helium was used as the carrier gas at a flow rate of 1.2 mL / min, and the injection was splitless.

[0031] The mass spectrometry conditions were as follows: EI ion source, electron energy 70 eV, transfer line temperature 250 ℃, ion source temperature 230 ℃, quadrupole temperature 150 ℃, mass scan range 30~450 amu, and solvent delay 3.5 min.

[0032] (E) Qualitative and quantitative analysis of volatile organic compounds: The obtained volatile organic compound data were compared with the NIST 17 and Wiley 7n.1 standard spectral libraries by computer, and the retention index was calculated in combination with n-alkanes to perform qualitative analysis of volatile organic compounds; the content of each volatile organic compound was calculated by internal standard method to complete the quantitative analysis.

[0033] (F) Olfactory Recognition of Odor Compounds: Substances separated by gas chromatography are fed into the mass spectrometer detector and the olfactory detection port via a Y-type splitter. The olfactory detection port has a transmission temperature of 250 ℃ and an outlet temperature of 150 ℃, with humid air continuously flowing through at a rate of 50 mL / min to moisten the olfactory cavity. Three professionally trained olfactory personnel continuously sniff at the olfactory detection port. When an odor is perceived, the corresponding RT, odor description, and OI are recorded, thereby establishing the correspondence between chemical components and odor perception.

[0034] (G) Calculation of OAV: The ratio of the concentration of volatile organic compounds obtained from quantitative analysis to their olfactory threshold concentration is calculated to obtain the odor activity value of each volatile organic compound. Volatile organic compounds with an odor activity value greater than 1 are considered to have a real contribution to the overall odor of polyvinyl chloride artificial leather.

[0035] (H) Determination of FD of volatile organic compounds using OEDA: Odor components were progressively diluted by adjusting the split ratio of the thermal desorption unit and the cooling injection system. The initial split ratio was set to 2:1, and then successively adjusted to 4:1, 8:1, 16:1, 32:1, 64:1, 128:1, etc., until the odor could no longer be perceived at the olfactory detection port. The maximum dilution factor that could be smelled was taken as the FD of the volatile organic compound. The higher the FD, the more significant the contribution of the volatile organic compound to the overall odor.

[0036] (2) Qualitative and quantitative analysis of volatile organic compounds in polyvinyl chloride artificial leather Using the above method, 71 volatile organic compounds were detected in the polyvinyl chloride artificial leather sample, with a total content of 711.81 mg / m³. 3 It is mainly divided into alkanes, alkenes, alcohols, phenols, ethers, aldehydes, ketones, acid and ester compounds, aromatic compounds, and others. Among them, there are 13 types of alkanes, with a content of 97.66 mg / m³. 3 There were 4 types of olefins, with a content of 107.36 mg / m³. 3 There were 10 types of alcoholic phenolic ethers, with a content of 164.59 mg / m³. 3 There were 7 types of aldehydes and ketones, with a content of 53.82 mg / m³. 3 There were 11 types of esters, with a content of 123.93 mg / m³. 3 There were 23 aromatic compounds, with a content of 87.53 mg / m³. 3 There were three other types of compounds, with a content of 87.53 mg / m³. 3 (like Figure 1 (As shown).

[0037] (3) Determination of key odor capture targets Thirty-three odor compounds with distinct odor characteristics were identified at the olfactory detection port. Of these, 24 compounds had an OAV value ≥ 1 (see Table 2), excluding seven that could not be detected at the air threshold. The OAV values, from highest to lowest, were: nonanal, 2-methylnaphthalene, octanal, N,N-dimethylformamide, decanal, 1,2,4,5-tetramethylbenzene, naphthalene, 2-ethylhexanol, lauryl alcohol, propylene glycol methyl ether acetate, pinene, benzaldehyde, styrene, mesitylene, 1-methylnaphthalene, heptanal, benzoic acid, ethylene glycol monobutyl ether, p-xylene, isopropylbenzene, methylheptenone, cyclohexanone, ethylbenzene, and 2-ethyltoluene. In addition, N-methylpyrrolidone and dibutyl phthalate had OAV values ​​less than 1, but were still detectable at the ODP end. This may be due to the high temperature and airflow at the ODP end, making these compounds more easily detected than at room temperature.

[0038] Subsequently, by varying the split ratio and performing serial dilutions at a ratio of 2, the FD factors of each compound were obtained. A higher FD factor indicates a more critical volatile organic compound. Nonanal and octanal had the highest FD values, both at 256; benzaldehyde, 1,3-dimethyl-2-ethylbenzene, 1,2,4,5-tetramethylbenzene, naphthalene, and decanal had the same FD value of 128. Three substances had an FD value of 64.

[0039] Volatile organic compounds (VOCs) were screened based on a comprehensive evaluation of odor activity value (OAV) and dilution factor (FD). The results showed that when both OAV > 1 and FD were high (≥ 64), the VOC made a decisive contribution to the overall odor of PVC artificial leather. Based on the above criteria, nonanal, octanal, benzaldehyde, 1,2,4,5-tetramethylbenzene, naphthalene, decanal, mesitylene, and 2-methylnaphthalene were ultimately identified as key odor-capturing targets in PVC artificial leather that significantly contribute to the overall odor (e.g., odor activity value and dilution factor). Figure 2 (As shown). Utilizing Figure 2 Further, by combining odor intensity (OI) with the sensory intensity visualization characterization of key odor capture targets, the results showed that the key odor compounds screened had significant characteristics in both the contribution and sensory intensity dimensions.

[0040] Table 2. Qualitative and quantitative table of volatile organic compounds in polyvinyl chloride artificial leather Note: a Not found.

[0041] As can be seen from the above embodiments, the method for screening key odor-capturing targets in polyvinyl chloride artificial leather proposed in this invention can accurately screen out key odor-capturing targets that play a dominant role in the overall odor from the finished material without involving the polyvinyl chloride artificial leather preparation process, providing a clear target basis for subsequent odor control research.

[0042] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the interpretation of the present invention, without departing from the scope of the invention, should be within the protection scope of the present invention.

Claims

1. A method for screening key odor-capturing targets in polyvinyl chloride artificial leather, characterized in that, Includes the following steps: (S1) The pretreated polyvinyl chloride artificial leather sample was subjected to adsorption and enrichment of volatile organic compounds using a sampling tube filled with packing material; (S2) Thermal desorption technology is used to thermally desorb the volatile organic compounds adsorbed and enriched in the sampling tube, and gas chromatography-mass spectrometry is used to perform qualitative and quantitative analysis of the volatile organic compounds. At the same time, olfactory information of the corresponding volatile organic compounds is obtained through gas chromatography-olfactory technology. (S3) Volatile organic compounds are comprehensively evaluated based on the odor activity value method and the odor extract dilution analysis method. When the odor activity value of a volatile organic compound is ≥1 and the dilution factor of the volatile organic compound is ≥64, the volatile organic compound is determined to be a key odor capture target in polyvinyl chloride artificial leather.

2. The method for screening key odor-capturing targets in polyvinyl chloride artificial leather according to claim 1, characterized in that, In step (S1), the preprocessing is specifically as follows: Cut the polyvinyl chloride artificial leather sample into pieces of 0.3–0.7 cm. 3 Small fragments.

3. The method for screening key odor-capturing targets in polyvinyl chloride artificial leather according to claim 1, characterized in that, In step (S1), during the adsorption and enrichment process, the sample size of polyvinyl chloride artificial leather is 5~10 g, the temperature is 23~100 ℃, and the time is 30~60 min.

4. The method for screening key odor-capturing targets in polyvinyl chloride artificial leather according to claim 1, characterized in that, In step (S1), the filler is selected from either Tenax TA or Tenax GR.

5. The method for screening key odor-capturing targets in polyvinyl chloride artificial leather according to claim 1, characterized in that, In step (S2), the heating procedure during thermal desorption is as follows: The initial temperature is 38~42 ℃, held for 0.4~0.6 min, and then increased to 235~245 ℃ at a rate of 115~125 ℃ / min, held for 7~9 min.

6. The method for screening key odor-capturing targets in polyvinyl chloride artificial leather according to claim 1, characterized in that, In step (S2), the gas chromatography-mass spectrometry (GC-MS) technique is used, and the specific procedure is as follows: Chromatographic conditions: HP-5ms capillary column, 30 m * 0.25 mm * 0.25 μm; Temperature program: Initial temperature 38–42℃, hold for 1.6–2.4 min, increase to 93–97℃ at 5–7℃ / min, do not hold, then increase to 155–165℃ at 1.5–2.5℃ / min, hold for 1.5–2.5 min, and finally increase to 225–235℃ at 4–6℃ / min, hold for 8–12 min; Carrier gas: helium, flow rate 1.1–1.3 mL / min, injection method: splitless injection; Mass spectrometry conditions: EI ion source; electron energy 68~72 eV; transfer line temperature 245~255 ℃; ion source temperature 225~235 ℃; quadrupole temperature 145~155 ℃; mass scan range 30~450 amu; solvent delay 3~4 min.

7. The method for screening key odor-capturing targets in polyvinyl chloride artificial leather according to claim 1, characterized in that, In step (S2), the qualitative analysis is as follows: The obtained volatile organic compound data were imported into the retrieval system, and the spectra were compared in the NIST 17 and Wiley 7n.1 standard spectral libraries. Qualitative analysis was then performed in conjunction with the retention index.

8. The method for screening key odor-capturing targets in polyvinyl chloride artificial leather according to claim 1, characterized in that, In step (S2), the internal standard method is used for quantitative analysis.

9. The method for screening key odor-capturing targets in polyvinyl chloride artificial leather according to claim 1, characterized in that, In step (S2), the gas chromatography olfaction is specifically performed as follows: A gas chromatograph was coupled to an olfactory detection port with a transmission temperature of 245–255 °C and an outlet temperature of 145–155 °C. Moist air at a flow rate of 45–55 mL / min was continuously injected into the olfactory detection port to quickly moisten the nasal cavity of the person smelling the odor. When the odor of volatile organic compounds was detected, the retention time, odor description, and odor intensity were recorded.

10. The method for screening key odor-capturing targets in polyvinyl chloride artificial leather according to claim 1, characterized in that, In step (S3), when calculating the odor activity value, the concentration of volatile organic compounds obtained from quantitative analysis is divided by the olfactory threshold concentration of the substance; The dilution factor is calculated by adjusting the split ratio of the thermal desorption unit and the cooling injector system, with the split ratio being a multiple of 2 for stepwise dilution.

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