Method for characterizing components and content of polyurethane foaming gas product

Abstract

The invention discloses a characterization method for components and content of a polyurethane foaming gas product, and belongs to the technical field of in-situ characterization of non-bulk substances to be detected. The characterization method comprises the following steps: acquiring infrared spectrum acquisition parameters; scanning a background; injecting a polyurethane foaming raw material of a specific gas product with gradient mass into a closed material bin without infrared absorption, and calculating and fitting a standard curve related to the mass of the specific gas product and the infrared peak intensity after the infrared peak intensity of the foaming specific gas product of the polyurethane foaming raw material is represented on line through the infrared spectrum acquisition parameters; after a polyurethane foaming raw material with unknown gas product content is injected into a closed material bin without infrared absorption, infrared peak intensity in the foaming process is represented online through the infrared spectrum acquisition parameters, functional groups are compared and analyzed according to an infrared standard spectrogram so as to determine the components of the gas product, and the content of the gas product is calculated according to a standard curve.

Description

Technical Field

[0001] This application belongs to the technical field of in-situ characterization of substances to be measured other than the main body, and particularly relates to a method for characterizing the components and contents of the gas products generated during polyurethane foaming. Background Art

[0002] Polyurethane foam is a foaming material formed by polymerizing isocyanate and polyol monomers. It has a flexible and designable cell structure and has been widely used in fields such as building materials, home materials, and automotive components. However, small molecule gas products generated during polyurethane foaming will remain in large quantities in the foam, affecting the performance of polyurethane foam and reducing its service life. Therefore, continuously and synchronously analyzing the small molecule gas products generated during polyurethane foaming is extremely important for preparing high-performance polyurethane foam.

[0003] Currently, related technologies have disclosed that the in-situ infrared technology (FTIR) can be used to in-situ characterize the laws of samples to be measured changing with time, temperature, pressure, and environment. For example, Liu Yang et al. monitored and analyzed the mechanism and products of visible light catalytic oxidation of NO by N-BOC / CdSeQDs through in-situ infrared spectroscopy, indicating that NO was deeply oxidized to NO3.

[0004] However, the current in-situ infrared technology is generally used for the monitoring and analysis of the main body of samples to be measured, especially for the in-situ characterization of catalysts. There has been no in-situ characterization of small molecule substances generated by polymer materials under external action. In particular, the expansion coefficient of foamed polyurethane is as high as 20-25 times, and the foam expansion is extremely likely to block the capture of the signals of small molecule gas products released during polyurethane foaming, restricting the detection of volatile small molecule gas products during polyurethane foaming, making the in-situ characterization of volatile small molecule products during polyurethane foaming still blank. Summary of the Invention

[0005] This application discloses a method for characterizing the components and contents of the gas products generated during polyurethane foaming. By optimizing the infrared spectrum acquisition parameters and designing a reasonable material bin, the in-situ characterization of volatile small molecule products during polyurethane foaming is realized for the first time.

[0006] To achieve the above object, the technical solution adopted in this application is:

[0007] The first aspect of this application provides a method for characterizing the components and contents of the gas products generated during polyurethane foaming, and its steps include:

[0008] S1: Obtain the infrared spectrum acquisition parameters;

[0009] S2: Scan the background;

[0010] S3: Inject the polyurethane foam raw material of a specific gas product with a certain gradient quality into a closed material bin without infrared absorption. After online characterizing the infrared peak intensity of the specific gas product generated by the foaming of the polyurethane foam raw material according to the infrared spectrum acquisition parameters, calculate and fit the standard curve related to the mass of the specific gas product and the infrared peak intensity, where the specific gas product is cyclopentane or carbon dioxide;

[0011] When the specific gas product is cyclopentane, the standard curve is shown in the following formula (1);

[0012] y = 0.14x + 0.0053 (1)

[0013] When the specific gas product is carbon dioxide, the standard curve is shown in the following formula (2);

[0014] y = 0.0013x - 0.0005 (2)

[0015] In formulas (1) and (2), x is the mass of the specific gas product, and y is the infrared peak intensity;

[0016] S4: After injecting the polyurethane foam raw material with an unknown gas product content into a closed material bin without infrared absorption, online characterize the infrared peak intensity during the foaming process according to the infrared spectrum acquisition parameters, compare and analyze the functional groups by referring to the infrared standard spectrum to determine the gas product components, and calculate the content of the gas product according to the standard curve.

[0017] According to the characterization method disclosed in the present application, the obtaining of the infrared spectrum acquisition parameters includes:

[0018] Establish experimental acquisition parameters including scanning resolution, scanning times, and scanning time;

[0019] Obtain experimental acquisition optimization parameters according to the infrared spectrum quality of the experimental acquisition parameters;

[0020] Determine the acquisition interval parameter according to the number of spectra obtained according to the experimental acquisition optimization parameters, that is, obtain the infrared spectrum acquisition parameters including scanning resolution, scanning times, scanning time, and acquisition interval.

[0021] According to the characterization method disclosed in the present application, the infrared spectrum acquisition parameters include:

[0022] (a) The scanning resolution is 4, 8; (b) The scanning times are 4, 8, 12;

[0023] (c) The scanning time is not more than 11 s; (d) The acquisition interval is 5 s;

[0024] Among them, the numerical difference between the scanning times and the scanning resolution is not more than 4.

[0025] According to the characterization method disclosed in the present application, the polyurethane foaming raw materials include:

[0026] Isocyanate pm2010; and

[0027] One of the polyols RCM6002-101, RCB6003-401, RCB6003-201, RCB6027-301.

[0028] According to the characterization method disclosed in the present application, the polyurethane foaming raw materials are a mixture of isocyanate pm2010 and polyol RCM6002-101;

[0029] The mass ratio of the isocyanate pm2010 to the polyol RCM6002-101 is 1 to 1.5.

[0030] According to the characterization method disclosed in the present application, the non-infrared absorption material bin is selected as a closed material bin for injecting inert gas to displace air;

[0031] Among them, the inert gas is one of helium, neon, and argon.

[0032] According to the characterization method disclosed in the present application, the standard curve for calculating the correlation between the mass of a specific gas product and the infrared peak intensity includes:

[0033] Using the least squares method to fit the correlation between the mass of a specific gas product and the infrared peak intensity, and obtaining the standard curve by binomial fitting.

[0034] According to the characterization method disclosed in the present application, when the specific gas product is cyclopentane, the gradient contents of cyclopentane are set to 0, 0.2, 0.4, 0.6, and 0.85 in sequence.

[0035] According to the characterization method disclosed in the present application, when the specific gas product is carbon dioxide, the gradient contents of carbon dioxide are set to 0, 1, 2, 3, and 5 in sequence.

[0036] In a second aspect, the present application also provides an application of the above-mentioned characterization method in the real-time monitoring of the release process of polyurethane foaming gas products.

[0037] Compared with the prior art, the advantages or beneficial effects of the embodiments of the present application at least include:

[0038] By reasonably designing the closed material bin and constructing the infrared spectrum acquisition parameters of the scanning resolution, scanning times, scanning time, and acquisition interval, the present invention ensures the polyurethane foaming ratio while reducing the blockage of the infrared light path by the foam, so as to be able to efficiently and accurately in-situ collect the infrared spectrum of the volatile gas products generated by polyurethane foaming, achieving real-time dynamic monitoring of the volatile gas products generated by polyurethane foaming. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 This is the infrared standard spectrum of cyclopentane generated by polyurethane foaming provided by the present application;

[0041] Figure 2 This is the standard curve of cyclopentane generated by polyurethane foaming provided by the present application;

[0042] Figure 3 This is the infrared standard spectrum of carbon dioxide generated by polyurethane foaming provided by the present application;

[0043] Figure 4 This is the standard curve of carbon dioxide generated by polyurethane foaming provided by the present application;

[0044] Figure 5 This is the infrared spectrum during the polyurethane foaming process provided by the present application;

[0045] Figure 6 This is the fitting curve of cyclopentane generated by polyurethane foaming provided by the present application;

[0046] Figure 7 This is the fitting curve of carbon dioxide generated by polyurethane foaming provided by the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0048] In the relevant description of the present application, the term "and / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: the situation of A alone, the situation of B alone, and the situation of both A and B existing at the same time. Where A and B can be singular or plural.

[0049] In the relevant description of this application, the term "at least one" means one or more, where "multiple" means two or more. "At least one of the following" or its similar description refers to any combination of these items, including any combination of single item or multiple items. For example, "at least one of A, B or C", or "at least one of A, B and C", both represent one of A, B, C, or A + B, or A + C, or B + C, or A + B + C, where A, B, C can be single or multiple respectively.

[0050] In the relevant description of this application, the sequence number precedence does not mean the precedence of the execution order. Some or all steps can be executed in parallel or sequentially. The execution order of each process should be specifically determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of this application.

[0051] In the relevant description of this application, the numerical range should be understood as specifically disclosing each intermediate value between the upper and lower limits of the range. The intermediate value within any stated value or stated range, as well as each smaller range between any other stated value or intermediate value within the stated range, is also included in this application. The upper and lower limits of these smaller ranges can be independently included or excluded from the range.

[0052] Unless otherwise specified, the technical / scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the art. Although this application only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein can also be used in the implementation or experiment of this application. In addition, all documents mentioned in this application are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In case of conflict with any incorporated document, the content of this specification shall prevail.

[0053] In a first aspect, an embodiment of this application provides a method for characterizing the composition and content of polyurethane foaming gas products, and its steps include:

[0054] S1: Obtain infrared spectrum acquisition parameters;

[0055] S2: Scan the background;

[0056] S3: Inject polyurethane foaming raw materials of specific gas products with gradient quality into a closed material bin without infrared absorption, and after online characterizing the infrared peak intensity of the polyurethane foaming raw materials foaming specific gas products by the infrared spectrum acquisition parameters, calculate and fit the standard curve related to the mass of the specific gas product and the infrared peak intensity, where the specific gas product is cyclopentane or carbon dioxide;

[0057] When the specific gas product is cyclopentane, the standard curve is shown in the following formula (1);

[0058] y = 0.14x + 0.0053 (1)

[0059] When the specific gas product is carbon dioxide, the standard curve is shown by the following formula (2);

[0060] y = 0.0013x - 0.0005 (2)

[0061] In formulas (1) and (2), x is the mass of the specific gas product, and y is the infrared peak intensity;

[0062] S4: After injecting the polyurethane foaming raw material with unknown gas product content into the airtight material bin without infrared absorption, the infrared peak intensity during the foaming process is characterized online according to the infrared spectrum acquisition parameters, and the functional groups are compared and analyzed by comparing with the infrared standard spectrum to determine the gas product components, and the content of the gas product is calculated according to the standard curve.

[0063] Among them, the polyurethane foaming raw material refers to the raw material monomers for preparing polyurethane by foaming, specifically a mixture of isocyanate and polyol combined according to a ratio; the infrared wavelength of the infrared spectrum acquisition parameters is preferably 2000 - 3500 cm -1 .

[0064] By reasonably designing the airtight material bin and constructing the infrared spectrum acquisition parameters of the scanning resolution, scanning times, scanning time and acquisition interval, the present invention ensures the polyurethane foaming ratio while reducing the blocking of the infrared optical path by the foam, so as to be able to efficiently and accurately in-situ collect the infrared spectrum of the volatile gas product generated by polyurethane foaming, achieving real-time dynamic monitoring of the volatile gas product generated by polyurethane foaming.

[0065] According to the exemplary scheme of the present disclosure, the obtaining of the infrared spectrum acquisition parameters includes:

[0066] Establishing experimental acquisition parameters including scanning resolution, scanning times and scanning time;

[0067] Obtaining experimental acquisition optimization parameters according to the infrared spectrum quality of the experimental acquisition parameters;

[0068] Determining the acquisition interval parameter according to the number of spectra obtained from the experimental acquisition optimization parameters, that is, obtaining the infrared spectrum acquisition parameters including scanning resolution, scanning times, scanning time and acquisition interval.

[0069] It should be noted that by the above optimization strategy, the infrared spectrum acquisition parameters including the scanning resolution, the number of scans, the scanning time, and the acquisition interval are established in the embodiments of the present application. It can not only complete the instant acquisition of data, effectively achieve the real-time online monitoring of the release process of the polyurethane foaming gas products, but also optimize the capture effect of the trace gas product signals, and accurately and efficiently detect various small molecule gas products generated in the polyurethane foaming.

[0070] According to the exemplary solution of the present disclosure, the infrared spectrum acquisition parameters include:

[0071] (a) The scanning resolution is 4, 8; (b) The number of scans is 4, 8, 12;

[0072] (c) The scanning time is not more than 11 s; (d) The acquisition interval is 5 s;

[0073] Among them, the numerical difference between the number of scans and the scanning resolution is not more than 4.

[0074] It should be noted that by the above optimization strategy, the infrared spectrum acquisition parameters including the scanning resolution, the number of scans, the scanning time, and the acquisition interval are established in the embodiments of the present application. It can not only complete the instant acquisition of data, effectively achieve the real-time online monitoring of the release process of the polyurethane foaming gas products, but also optimize the detection effect of the trace gas product signals, and accurately and efficiently detect various small molecule gas products generated in the polyurethane foaming.

[0075] According to the exemplary solution of the present disclosure, the polyurethane foaming raw material is a mixture of isocyanate and polyol, preferably one of polyols RCM6002 - 101, RCB6003 - 401, RCB6003 - 201, RCB6027 - 301; and, a mixture with isocyanate pm2010. Among them, there are no special limitations on the sources of the isocyanate and polyol in the present application, and they can be obtained through commercial purchase.

[0076] According to the exemplary solution of the present disclosure, the polyurethane foaming raw material is preferably a mixture of isocyanate pm2010 and polyol RCM6002 - 101, and the mass ratio of isocyanate pm2010 to polyol RCM6002 - 101 is preferably 1 to 1.5. Among them, the mass ratio refers to the numerical value of the mass ratio of isocyanate pm2010 to polyol RCM6002 - 101.

[0077] According to the exemplary solution of the present disclosure, the airtight material bin without infrared absorption is selected as an airtight material bin injected with an inert gas to displace air, and its volume is calculated according to 20 - 60 g / mL with respect to the mass of the polyurethane foaming material. Among them, the inert gas is one of helium, neon, and argon.

[0078] It should be noted that the air composition in the material bin will interfere with the accurate detection and analysis of the sample. Using inert gases such as helium, neon, and argon to exclude air can avoid air interference, enabling the detected infrared signal to more accurately reflect the characteristics of the sample itself, thereby improving the accuracy and reliability of experimental data.

[0079] According to the exemplary scheme of the present disclosure, the standard curve for calculating the correlation between the mass of a specific gas product and the infrared peak intensity includes: fitting the correlation between the mass of the specific gas product and the infrared peak intensity using the least squares method, and obtaining the standard curve by binomial fitting. Among them, the present invention does not have special limitations on the specific process of fitting the standard curve, and it can be directly output by using software such as origin.

[0080] According to the exemplary scheme of the present disclosure, when the specific gas product is cyclopentane, the gradient contents of cyclopentane are sequentially set to 0, 0.2, 0.4, 0.6, and 0.85.

[0081] According to the exemplary scheme of the present disclosure, when the specific gas product is carbon dioxide, the gradient contents of carbon dioxide are sequentially set to 0, 1, 2, 3, and 5.

[0082] In a second aspect, the embodiments of the present application also disclose the application of the above-described characterization method of the present application. Specifically, the characterization method is used for real-time monitoring of the release process of polyurethane foaming gas products. Among them, since the characterization method of the present application can instantaneously and accurately collect the infrared spectral information of cyclopentane and carbon dioxide generated during the polyurethane foaming process, it can be used for real-time monitoring of the release process of polyurethane foaming gas products.

[0083] The technical solutions of the present application will be further elaborated below in conjunction with specific embodiments.

[0084] 1. Experimental part

[0085] The near-infrared spectrometer used is Thermo ANTARIS II: InGaAs detector, configured with a transmission sampling module; the material bin is a colorless glass tube with an inner diameter of 5 mm, an outer diameter of 6 mm, and a height of 50 mm, and a volume of 1 mL, sealed with a silicone rubber soft plug with a surface coating of polytetrafluoroethylene (formed without air after argon displacement); TQ Analyst 8 analysis software.

[0086] 2. Obtain infrared spectrum acquisition parameters

[0087] Put the standard sample isocyanate pm2010 (13.56 g) and polyol RCM6002 - 101 (10 g) into the pre - treated material bin, and online characterize the infrared spectrum during the foaming process of the standard sample according to the experimental acquisition parameters described in Table 1 to obtain the infrared peak intensity during the polyurethane foaming process, and obtain the optimized experimental acquisition parameters by integrating the spectral quality and scanning time.

[0088] Table 1: Experimental acquisition parameters

[0089]

[0090]

[0091] According to Table 1, to ensure high - quality and real - time acquisition of small - molecule gas products generated during polyurethane foaming, the scanning time and resolution should be reasonably selected. The present invention specifically selects the optimized experimental acquisition parameters of Experiments 13, 14, 17, 18, and 19.

[0092] Establish an experiment related to the acquisition interval according to the optimized experimental acquisition parameters described above, and optimize the acquisition interval based on the number of infrared spectra obtained. Specifically, it is shown in Table 2.

[0093] Table 2: Experiments related to the acquisition interval

[0094]

[0095] According to Table 2, to obtain as many spectra as possible during the polyurethane foaming process, the present invention preferably selects the acquisition intervals of Experiment 25 and Experiment 33.

[0096] 3. Scan the background;

[0097] 4. Establish a standard curve

[0098] 4.1 Online characterize the infrared spectrum of cyclopentane (see specifically Figure 1 ) and the infrared peak intensity, and establish a standard curve related to the mass of cyclopentane and the infrared peak intensity. The specific method is as follows:

[0099] After putting the polyurethane foaming raw material sample with known gradient cyclopentane mass into the material bin, online characterize to obtain the standard infrared peak intensity of cyclopentane during the foaming process of the polyurethane foaming raw material sample through the infrared spectrum acquisition parameters. Specifically, it is shown in Table 3.

[0100] Table 3: Standard infrared peak intensity of cyclopentane

[0101] x y 0 0.0043 0.2 0.0329 0.4 0.0641 0.6 0.0835 0.85 0.123

[0102] Respectively, plot the standard working curve with the cyclopentane mass x as the abscissa and the infrared peak intensity y as the ordinate. The result is Figure 2As shown, the correlation between the mass of cyclopentane and the infrared peak intensity was fitted using the least squares method, and the regression equation of the standard curve shown in the following formula (1) was obtained by binomial fitting;

[0103] y = 0.14x + 0.0053, with R being 0.994 (1)

[0104] 4.2 Online characterization of the infrared spectrum of carbon dioxide (see specifically Figure 3 ), as well as the infrared peak intensity, and establish a standard curve related to the mass of carbon dioxide and the infrared peak intensity. The specific method is as follows:

[0105] After putting the polyurethane foam raw material with known gradient water content into the material bin, the standard infrared peak intensity of carbon dioxide during the foaming process of the polyurethane foaming raw material sample was obtained by online characterization through infrared spectrum acquisition parameters, as shown in Table 4 specifically.

[0106] Table 4: Standard infrared peak intensity of carbon dioxide

[0107] x y 0 -0.0006 1 0.0008 2 0.0025 3 0.0034 5 0.006

[0108] Using the mass of carbon dioxide x as the abscissa and the infrared peak intensity y as the ordinate to plot the standard working curve, the result is Figure 4 As shown, and the correlation between the mass of carbon dioxide and the infrared peak intensity was fitted using the least squares method, and the regression equation of the standard curve shown in the following formula (2) was obtained by binomial fitting;

[0109] y = 0.0013x - 0.0005, with R being 0.992 (2)

[0110] 5. Characterization of the composition and content of the gas products generated by polyurethane foaming

[0111] Put the to-be-tested sample isocyanate pm2010 and polyol RCM6002 - 101 into the pre-treated material bin, and perform online characterization of the infrared spectrum during the foaming process of the standard sample according to the infrared spectrum acquisition parameters in Table 5 to obtain the infrared spectrum and infrared peak intensity during the polyurethane foaming process. Among them, the infrared spectrum is Figure 5 As shown.

[0112] Taking the Figure 1 and Figure 3 infrared spectra as references, analyze the infrared spectrum obtained during the detection of polyurethane foaming, determine that the volatile small molecule gas products generated during the polyurethane foaming process are cyclopentane and carbon dioxide respectively, and record the infrared peak intensity of each gas product in Table 5 below. Figure 5

[0113] Table 5: In-situ infrared data of unknown samples

[0114] ​

[0115]

[0116] The content of the volatile small molecule gas products generated during the polyurethane foaming process was calculated based on the infrared peak intensities in Table 5, and the release process during the polyurethane foaming process was fitted with time as the abscissa and the content of the volatile small molecule gas products as the ordinate. The results are Figures 6 - 7 as shown.

[0117] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized.

[0118] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A method for characterizing the composition and content of a polyurethane foaming gas product, characterized in that, Comprising: S1: Obtain infrared spectrum acquisition parameters; S2: Scan the background; S3: Inject the polyurethane foam raw material of a specific gas product with gradient quality into a closed material bin without infrared absorption. After online characterizing the infrared peak intensity of the specific gas product generated by the foaming of the polyurethane foam raw material according to the infrared spectrum acquisition parameters, calculate and fit the standard curve related to the mass of the specific gas product and the infrared peak intensity. Among them, the specific gas product is cyclopentane or carbon dioxide; When the specific gas product is cyclopentane, the standard curve is shown in the following formula (1); y = 0.14x + 0.0053 (1) When the specific gas product is carbon dioxide, the standard curve is shown in the following formula (2); y = 0.0013x - 0.0005 (2) In formulas (1) and (2), x is the mass of the specific gas product, and y is the infrared peak intensity; S4: After injecting the polyurethane foam raw material with an unknown gas product content into a closed material bin without infrared absorption, online characterize the infrared peak intensity during the foaming process according to the infrared spectrum acquisition parameters, and compare and analyze the functional groups with the infrared standard spectrum to determine the gas product components, and calculate the content of the gas product according to the standard curve.

2. The characterization method according to claim 1, characterized in that, The obtaining of the infrared spectrum acquisition parameters comprises: Establish experimental acquisition parameters including scanning resolution, scanning times, and scanning time; Obtain experimental acquisition optimization parameters according to the infrared spectrum quality of the experimental acquisition parameters; Determine the acquisition interval parameter according to the number of spectra obtained from the experimental acquisition optimization parameters, that is, obtain the infrared spectrum acquisition parameters including scanning resolution, scanning times, scanning time, and acquisition interval.

3. The characterization method according to claim 2, characterized in that, The infrared spectrum acquisition parameters include: (a) The scanning resolution is 4, 8; (b) The scanning times are 4, 8, 12; (c) The scanning time is not more than 11 s; (d) The acquisition interval is 5 s; Among them, the numerical difference between the scanning times and the scanning resolution is not more than 4.

4. The characterization method according to claim 1, characterized in that, The polyurethane foam raw material comprises: Isocyanate pm2010; and One of polyols RCM6002 - 101, RCB6003 - 401, RCB6003 - 201, RCB6027 - 301.

5. The characterization method according to claim 1, characterized in that, The polyurethane foam raw material is a mixture of isocyanate pm2010 and polyol RCM6002 - 101; The mass ratio of the isocyanate pm2010 to the polyol RCM6002 - 101 is 1 to 1.

5.

6. The characterization method according to claim 1, wherein The closed material bin without infrared absorption is selected as a closed material bin into which an inert gas is injected to displace air; Among them, the inert gas is one of helium, neon, and argon.

7. The characterization method according to claim 1, characterized in that, The calculating and fitting of the standard curve related to the mass of the specific gas product and the infrared peak intensity comprises: Use the least squares method to fit the correlation between the mass of the specific gas product and the infrared peak intensity, and obtain the standard curve by binomial fitting.

8. The characterization method according to claim 1, characterized in that, When the specific gas product is cyclopentane, the gradient contents of cyclopentane are set to 0, 0.2, 0.4, 0.6, 0.85 in sequence.

9. The characterization method according to claim 1, characterized in that, When the specific gas product is carbon dioxide, the gradient contents of carbon dioxide are set to 0, 1, 2, 3, 5 in sequence.

10. Use of the characterization method according to any one of claims 1 to 9 in real-time monitoring of the release process of polyurethane foaming gas products.

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