A method for analyzing and evaluating the anti-degradation performance of plastics by linear extrapolation based on the results of aerobic biodegradation tests under controlled composting conditions

Abstract

The present invention relates to a method for analyzing and evaluating the degradation resistance of plastics based on the linear extrapolation of aerobic biodegradation test results under controlled composting conditions. The method comprises: conducting an aerobic biodegradation test on the plastic under controlled composting conditions to obtain the test results; performing logarithmic processing on the biodegradation rate or relative biodegradation rate and / or time, and plotting a scatter plot of the logarithmic decomposition rate versus time or logarithmic time; dividing the scatter plot into segments and performing linear fitting and linear extrapolation, respectively, to obtain the slopes of the two fitted lines and their intersection as the output of the method. The present invention relates to a data analysis method that can quantitatively describe the differences between the non-microbial chemical degradation and microbial biodegradation behaviors of plastics in the early and middle stages of an aerobic biodegradation test, as well as their critical transition points. The method can be used to quantitatively evaluate the hydrolysis resistance or hydrolysis resistance of plastics of different types, processes, formulations, and batches.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer material analysis, and in particular relates to a method for evaluating the anti-degradation performance of plastics, and also relates to a system, equipment and medium thereof adopting the method. Background Art

[0002] The invention and use of plastics have greatly facilitated people's lives, but at the same time have also caused serious environmental pollution. Biodegradable polymer materials represented by polylactic acid and polybutylene adipate terephthalate are committed to solving the problem of plastic / microplastic pollution. In addition, in the engineering field, high-performance polymer materials represented by polyamide are also increasingly widely used. However, most of the above materials are hydrolyzable, that is, they meet the necessary conditions for hydrolysis. For example, the ester bond (-COO-) in polyester materials and the amide bond (-CO-NH-) in polyamide materials can undergo hydrolysis in the presence of water and catalysts, resulting in a significant decrease in the molecular weight of the polymer and a rapid deterioration of the material properties. Therefore, scientifically and reliably characterizing and evaluating the hydrolysis resistance or hydrolysis resistance of plastics is an important means to ensure the large-scale promotion and application of such plastics, and is of great significance.

[0003] At present, some characterization and analysis techniques have been developed to evaluate properties related to plastic degradation. For example, visual observation, weight loss weighing, mechanical property evaluation, molecular weight evaluation, melt index evaluation, etc. can reflect the degree of degradation of the tested plastic at a certain moment to a certain extent, but each has its own defects. For example, the visual observation method requires a high time cost to make the sample achieve visible degradation, and the results are somewhat subjective; the weight loss weighing method cannot measure short-term degradation fluctuations and cannot reflect the impact of rapid changes in process parameters on the degradation rate of plastics; the mechanical property evaluation method cannot be used to test plastics that are broken during the degradation process; the molecular weight evaluation method requires the use of advanced chromatographic instruments to separate and characterize polymer chains of different molecular weights during the degradation process, which places high demands on testing instruments and testers; the melt index evaluation method measures the comprehensive properties of a mixture of degraded and undegraded polymers. In particular, the effect of a small amount of degraded polymers on the overall melt index in the early stages of degradation may be lower than the accidental error of the method, and accurate results cannot be obtained. As is known in the art, these prior art testing and evaluation methods are often destructive to the samples being tested. Consequently, they require numerous parallel sample tests to determine temporal trends in relevant properties. These methods place high demands on the samples, personnel, equipment, and environment used for testing, and exhibit poor test repeatability. Furthermore, these methods are generally insensitive to initial or minor degradation of plastics, and are unable to accurately and accurately reflect the degradation resistance (e.g., hydrolysis resistance) of the tested plastic.

[0004] Therefore, there is still a need to develop characterization and analytical methods for evaluating the degradation properties of plastics that can achieve a simple test and analysis process without relying on a large number of parallel sample tests. More ideally, the method should be able to sensitively and accurately reflect the hydrolysis resistance or hydrolysis resistance of plastics.

[0005] The present inventors unexpectedly discovered that by analyzing and characterizing the results of aerobic biodegradation tests of plastics known in the art under controlled composting conditions, the critical transition time point (i.e., critical point) in the early, middle, or initial stages of the test, which transitions from a chemical degradation process involving no microorganisms (i.e., the hysteresis stage) to a biochemical process involving microorganisms (i.e., the biodegradation stage), can be obtained. The numerical value of this critical point accurately reflects the length of time or speed required for the plastic to degrade to a molecular weight level that can be digested and absorbed by microorganisms under aerobic controlled composting conditions, thereby addressing the above-mentioned deficiencies of the prior art and further serving as an indicator parameter for evaluating the hydrolysis resistance or hydrolysis resistance of plastics. Summary of the Invention

[0006] One object of the present invention is to overcome at least one shortcoming of the prior art, and in particular to provide a method for evaluating the degradation resistance of plastics. The method is based on the linear extrapolation method to analyze the results of aerobic biodegradation tests of plastics under controlled composting conditions. The method can quantitatively describe the differences and critical transition points between the chemical degradation behaviors (mainly hydrolysis reactions) involving non-microbial participation and the biodegradation behaviors involving microorganisms in the early, middle or early stages of the aerobic biodegradation test, thereby being used to evaluate the hydrolysis resistance or hydrolysis resistance of plastics (especially hydrolyzable plastics such as polyesters and polyamides) of different types, processes, formulas and batches.

[0007] According to a first aspect of the present invention, a method for analyzing and evaluating the degradation resistance of plastics based on the linear extrapolation method of aerobic biodegradation test results under controlled composting conditions is provided, characterized in that the method comprises the following steps:

[0008] (1) conducting aerobic biodegradation tests on plastics under controlled composting conditions and obtaining the results of said tests,

[0009] Wherein, the plastic is i The biodegradation rate (%) of |i=1,2,3,...,n} is recorded as

[0010] (2) performing data processing and graphing on the biodegradability of the plastic,

[0011] Among them, the logarithmic operation is used to convert the obtained value in step (1) into Convert to And draw a scatter plot of y1 with respect to t, and record the scatter plot as P1={(y 1i ,t i )|i=1,2,3,...,n}, where {a1>0∩a1≠1|a1∈R}, that is, a1>0 and not equal to 1, and Right now

[0012] (3) Perform linear fitting and linear extrapolation on the scatter plot P1 in step (2),

[0013] The scatter plot P1 is divided into at least two segments that are substantially linear and contain as many consecutive data points as possible. A linear fit is performed on the data points of each segment, and the data point of the segment with the largest slope of the linear fit is recorded as P. 1A , its linear fitting equation is expressed as Equation 1:

[0014] Y 1A =k 1A t+c 1A Equation 1

[0015] P 1A The data point of the segment with the smallest slope of the linear fit on the left is recorded as P 1B , its linear fitting equation is expressed as Equation 2:

[0016] Y 1B =k 1B t+c 1B Equation 2

[0017] where k 1A >0, and k 1A >k 1B ,

[0018] And wherein, the straight lines described by equation 1 and equation 2 are linearly extrapolated to obtain the intersection point, and the time t corresponding to the intersection point is obtained. c1 ;and

[0019] (4) Output analysis results,

[0020] The result includes the parameter t obtained in step (3) c1 , optionally also including k 1A and / or k 1B .

[0021] According to a second aspect of the present invention, a method for analyzing and evaluating the degradation resistance of plastics based on the linear extrapolation method of aerobic biodegradation test results under controlled composting conditions is provided, characterized in that the method comprises the following steps:

[0022] (1) conducting aerobic biodegradation tests on plastics under controlled composting conditions and obtaining the results of said tests,

[0023] Wherein, the plastic is i The biodegradation rate (%) of |i=1,2,3,...,n} is recorded as

[0024] (2) performing data processing and graphing on the biodegradability of the plastic,

[0025] Among them, the logarithmic operation is used to convert the obtained value in step (1) into Convert to And convert time t into And draw a scatter plot of y2 relative to x1, and record the scatter plot as P2={(y 2i ,x 1i )|i=1,2,3,...,n}, where {a2>0∩a2≠1|a2∈R}, that is, a2>0 and not equal to 1, and Right now

[0026] (3) Perform linear fitting and linear extrapolation on the scatter plot P2 in step (2),

[0027] The scatter plot P2 is divided into at least two segments that are substantially linear and contain as many consecutive data points as possible. A linear fit is performed on the data points of each segment, and the data point of the segment with the largest slope of the linear fit is recorded as P. 2A , its linear fitting equation is expressed as Equation 3:

[0028] Y 2A =k 2A x1+c 2A Equation 3

[0029] P 2A The data point of the segment with the smallest slope of the linear fit on the left is recorded as P 2B , its linear fitting equation is expressed as Equation 4:

[0030] Y 2B =k 2B x1+c 2B Equation 4

[0031] where k 2A >0, and k 2A >k 2B ,

[0032] And wherein, the straight lines described by equation 3 and equation 4 are linearly extrapolated to obtain the intersection point, and the x corresponding to the intersection point is obtained. c2 and by the equation Obtain the time t corresponding to the intersection point c2 ;and

[0033] (4) Output analysis results,

[0034] The result includes the parameter t obtained in step (3) c2 , optionally also including k 2A and / or k 2B .

[0035] According to a third aspect of the present invention, there is provided a method for analyzing and evaluating the degradation resistance of plastics based on the linear extrapolation method of aerobic biodegradation test results under controlled composting conditions, characterized in that the method comprises the following steps:

[0036] (1) conducting aerobic biodegradation tests on plastics under controlled composting conditions and obtaining the results of said tests,

[0037] Wherein, the plastic and the reference material are i The biodegradation rates (%) of |i=1,2,3,...,n} are respectively expressed as and The relative biodegradation rate of the plastic is further obtained according to Equation 5:

[0038]

[0039] (2) performing data processing and graphing on the relative biodegradability of the plastic,

[0040] Among them, the logarithmic operation is used to convert the Convert to And draw a scatter plot of y3 with respect to t, and record the scatter plot as P3={(y 3i ,t i )|i=1,2,3,...,n}, where {a3>0∩a3≠1|a3∈R}, that is, a3>0 and not equal to 1, and Right now

[0041] (3) Perform linear fitting and linear extrapolation on the scatter plot P3 in step (2),

[0042] The scatter plot P3 is divided into at least two segments that are substantially linear and contain as many consecutive data points as possible. A linear fit is performed on the data points of each segment, and the data point of the segment with the largest slope of the linear fit is recorded as P.3A , its linear fitting equation is expressed as Equation 6:

[0043] Y 3A =k 3A t+c 3A Equation 6

[0044] P 3A The data point of the segment with the smallest slope of the linear fit on the left is recorded as P 3B , its linear fitting equation is expressed as Equation 7:

[0045] Y 3B =k 3B t+c 3B Equation 7

[0046] where k 3A >0, and k 3A >k 3B ,

[0047] And wherein, the straight lines described by equation 6 and equation 7 are linearly extrapolated to obtain their intersection, and the time t corresponding to the intersection is obtained. c3 ;and

[0048] (4) Output analysis results,

[0049] The result includes the parameter t obtained in step (3) c3 , optionally also including k 3A and / or k 3B .

[0050] According to a fourth aspect of the present invention, there is provided a method for analyzing and evaluating the degradation resistance of plastics based on the linear extrapolation method of aerobic biodegradation test results under controlled composting conditions, characterized in that the method comprises the following steps:

[0051] (1) conducting aerobic biodegradation tests on plastics under controlled composting conditions and obtaining the results of said tests,

[0052] Wherein, the plastic and the reference material are i The biodegradation rates (%) of |i=1,2,3,...,n} are respectively expressed as and The relative biodegradation rate of the plastic is further obtained according to Equation 5:

[0053]

[0054] (2) performing data processing and graphing on the biodegradability of the plastic,

[0055] Among them, the logarithmic operation is used to convert the obtained value in step (1) into Convert to And convert time t into And draw a scatter plot of y4 relative to x2, and record the scatter plot as P4={(y 4i ,x 2i )|i=1,2,3,...,n}, where {a4>0∩a4≠1|a4∈R}, that is, a4>0 and not equal to 1, and Right now

[0056] (3) Perform linear fitting and linear extrapolation on the scatter plot P4 in step (2),

[0057] The scatter plot P4 is divided into at least two segments that are substantially linear and contain as many consecutive data points as possible. A linear fit is performed on the data points of each segment, and the data point of the segment with the largest slope of the linear fit is recorded as P. 4A , its linear fitting equation is expressed as Equation 8:

[0058] Y 4A =k 4A x2+c 4A Equation 8

[0059] P 4A The data point of the segment with the smallest slope of the linear fit on the left is recorded as P 4B , its linear fitting equation is expressed as Equation 9:

[0060] Y 4B =k 4B x2+c 4B Equation 9

[0061] where k 4A >0, and k 4A >k 4B ,

[0062] And wherein, the straight lines described by equation 8 and equation 9 are linearly extrapolated to obtain their intersection point, and the x corresponding to the intersection point is obtained. c4 and by the equation Obtain the time t corresponding to the intersection point c4 ;and

[0063] (4) Output analysis results,

[0064] The result includes the parameter t obtained in step (3) c4 , optionally also including k 4A and / or k 4B .

[0065] According to a fifth aspect of the present invention, a system for evaluating the degradation resistance of plastics is provided, characterized in that the system adopts the method according to any of the above aspects.

[0066] According to a sixth aspect of the present invention, there is provided a computer device, characterized in that it comprises:

[0067] processor; and

[0068] a memory for storing executable instructions;

[0069] The processor is configured to read and execute the executable instructions from the memory to implement the method described above.

[0070] According to a seventh aspect of the present invention, a computer-readable storage medium is provided, characterized in that it stores a computer program, and when the computer program is executed by a processor, the method described above is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 The scatter plot and analysis results of Example 1 are shown.

[0072] Figure 2 The scatter plot and analysis results of Example 2 are shown.

[0073] Figure 3 The scatter plot and analysis results of Example 3 are shown.

[0074] Figure 4 The scatter plot and analysis results of Example 4 are shown. DETAILED DESCRIPTION

[0075] The present invention is described in more detail in the following paragraphs. Unless explicitly stated otherwise, each aspect of description may be combined with any other one or more aspects. In particular, any feature indicated as preferred may be combined with any other one or more features indicated as preferred.

[0076] The recitation of numerical endpoints includes all numbers and fractions within the corresponding range, as well as the recited endpoints. It should be noted that in specifying any range of numerical values, any particular upper value can be associated with any particular lower value.

[0077] All references cited in this specification are hereby incorporated by reference in their entirety.

[0078] In the context of the present invention, unless otherwise defined, all terms used in the present invention, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

[0079] As used herein, the terms "comprising" and "consisting of" are synonymous with "including" or "containing" and are inclusive or open-ended and do not exclude additional, unrecited ingredients, components, or process steps.

[0080] As used herein, the term "degradation" or "decomposition" refers to the significant changes in the chemical structure of plastics under specific environmental conditions, resulting in the loss of certain properties. This can be any process that results in a decrease in the molecular weight of polymers or the conversion of long-chain structures into shorter, low-molecular-weight substances. Depending on the process involved, plastics can be degraded in three main ways: biological degradation, chemical degradation, and physicochemical degradation.

[0081] As used herein, the term "biodegradation" refers to the process by which plastics, acting as a nutrient source for microbial life, are digested and absorbed by organisms such as bacteria, fungi, and certain algae, transforming them into simpler compounds and ultimately into small molecules such as methane, carbon dioxide, and water. For example, the degradation of biodegradable plastics relies on biological processes that utilize the carbon-containing substances present in the plastics as a nutrient source for microorganisms.

[0082] As used herein, the term "chemical degradation" refers to the process by which plastics degrade through oxidative degradation, photodegradation, or hydrolysis, including oxidatively degradable plastics, photodegradable plastics, and hydrolytically degradable plastics. Specifically, chemical degradation in the present invention refers to the degradation process before plastics can be digested and absorbed by organisms. As known to those skilled in the art, the aerobic biodegradation test under controlled composting conditions of the present invention is conducted under specified temperature, oxygen concentration, humidity, and darkness or low light conditions. Therefore, the chemical degradation involved is primarily hydrolytic degradation.

[0083] As used herein, the term "physicochemical degradation" refers to the process by which plastics degrade under the influence of physical fields such as heat, electric fields, and stress. Specifically, physicochemical degradation in this context refers to the degradation of plastics before they can be digested and absorbed by organisms. As known to those skilled in the art, the aerobic biodegradation tests under controlled composting conditions described herein are conducted in darkness or low light conditions, and therefore the physicochemical degradation effects involved are relatively weak.

[0084] It is known in the art that the degradation rate of plastics is affected by numerous factors, including environmental factors such as temperature, humidity, pH, chemical media, and light exposure, as well as factors inherent to the plastic itself, such as the polymer's primary, secondary, and tertiary structures, molecular weight and distribution, as well as composition, interfacial structure, physical morphology, porosity, and impurities. One objective of the present invention is to demonstrate the comprehensive anti-degradation properties of plastics through the methods of the present invention.

[0085] As used herein, the term "aerobic biodegradation test under controlled composting conditions" refers to determining the ultimate aerobic biodegradability and degree of disintegration of a plastic material by measuring the amount of carbon dioxide emitted by the plastic material as an organic compound under controlled composting conditions according to methods known in the art. By observing the temporal trend of its biodegradation rate or relative biodegradation rate, it can be found that the plastic material has a zero or even negative decomposition rate in the initial stage of degradation, which is referred to as the "hysteresis phase." Related research has found (Handbook of Biodegradable Polymers, Edited by Abraham J. Domb, Joseph Kost and David M. Wiseman, published in 1997 by CRC Press, pages 451-453) that, in the hysteresis phase, the plastic undergoes chemical degradation (such as hydrolysis, oxidative degradation, photodegradation, etc.) before biodegradation, under the influence of factors such as water, temperature, pH, and chemical substances, which can cause changes in its chemical structure. For example, before aerobic biodegradation begins, polylactic acid first needs to break ester bonds and reduce its molecular weight through a hydrolysis reaction (Hamad, Kotiba, et al. Properties and medical applications of polylactic acid: A review. Express polymer letters, 2015, 9 (5): 435-455). When the molecular weight is low to a certain threshold, for example, below 10 kDa, its oligomers or monomers are water-soluble and can be digested and absorbed by microorganisms or cells (Lunt, J. Large-scale production, properties and commercial applications of polylactic acid polymers. Polymer Degradation and Stability, 1998, 59: 145-152). In the biochemical process involving aerobic microorganisms, its oligomers or monomers can be further decomposed into small molecules until they are finally decomposed into carbon dioxide and water.

[0086] As is known in the art, during aerobic biodegradation tests under controlled composting conditions, the cumulative amount of carbon dioxide released is calculated by continuously monitoring and periodically measuring the carbon dioxide production in the test container and a blank container. The biodegradation rate is the ratio of the actual amount of carbon dioxide released by the plastic test material during the test to the theoretical amount of carbon dioxide that the material can produce. Those skilled in the art are aware that the aerobic biodegradability test of plastic test materials under controlled composting conditions can be carried out according to the test procedures in the following standards: GB / T 19277.1 “Determination of the ultimate aerobic biodegradability of plastic materials under controlled composting conditions—Method by analysis of evolved carbon dioxide—Part 1: General method”, or GB / T 19277.2 “Determination of the ultimate aerobic biodegradability of plastic materials under controlled composting conditions—Method by analysis of evolved carbon dioxide—Part 2: Gravimetric measurement of carbon dioxide evolved in a laboratory-scale test”, or ISO 14855-1, or ISO 14855-2, or ASTM D5929 “Standard Test Method for Determining Biodegradability of Materials Exposed to Source-Separated Organic Municipal Solid Waste Mesophilic Composting Conditions by Respirometryor ASTM D5338 “Standard Test Method for Determining Aerobic Biodegradation of Plastic Materials Under Controlled Composting Conditions, Incorporating Thermophilic Temperatures”, or EN ISO 14855-1, or EN ISO 14855-2, or BS EN ISO 14855-1, or BS EN ISO 14855-2, or DIN EN ISO 14855-1, or DIN EN ISO 14855-2, or KS T ISO 20200 “Plastics—Determination of the degree of disintegration of plastic materials under simulated composting conditions in a laboratory-scale test”, or UNE-EN 14995 “Plastics—Evaluation of compostability—Test scheme andspecifications” (test protocols and specifications for the assessment of the compostability of plastics), or AS5810 “Biodegradable plastics—Biodegradable plastics suitable for home composting” (biodegradable plastics—biodegradable plastics suitable for home composting).

[0087] The "biodegradation rate" used in the present invention can be determined according to methods known in the art. For example, the biodegradation rate of the plastic test material can be calculated according to the following equation in GB / T 19277.1:

[0088]

[0089] Of which (CO2) T The cumulative amount of carbon dioxide released from the compost container containing the test material (CO2) B is the average amount of carbon dioxide released from the blank container, and ThCO2 is the theoretical amount of carbon dioxide released by the test material. The same equation applies to the biodegradation rate of the reference material.

[0090] The aerobic biodegradation test under controlled composting conditions of the present invention can be carried out in a container or indoors, in darkness or weak light, without any steam that may affect the growth of microorganisms.

[0091] The "relative biodegradability" used in the present invention can be determined according to methods known in the art. For example, the relative biodegradability of the plastic test material can be further obtained according to the following equation:

[0092]

[0093] in, and are the plastic and the reference material at each time point {t i |i=1,2,3,...,n}Biodegradation rate (%).

[0094] The term "digestion vessel / composting vessel" as used herein refers to a vessel known in the art for aerobic biodegradation testing under controlled composting conditions. The digestion vessel can typically comprise a tightly connected glass container or a vessel made of other materials that does not affect the composting effect to avoid gas loss. The container may include a container containing a test material, a container containing a reference material, or a blank container. The container may be connected to an air system and a carbon dioxide measurement system.

[0095] As used herein, the term "plastic" refers to all types of plastics generally known in the art, in particular plastics that can be used in aerobic biodegradation tests under controlled composting conditions, such as plastics that can be tested for aerobic biodegradation under controlled composting conditions according to the 15 standards mentioned above. Such plastics may include, but are not limited to, all polymer compounds containing chemical bonds such as ester bonds, anhydride bonds (-RCOOOC-), orthoester bonds (-OCOR'R"OR-), carbonate bonds (-ROCOO-), phosphate bonds (-OPOR'OOR-), ketal bonds (-OCR'R"OR-), acetal bonds (-OCHR'OR-), imino-carbonate bonds (-ROCNHO-), peptide bonds / amide bonds (-CONH-), and / or phosphazene bonds (-RR'P=N-) in the polymer main chain or branched chain skeleton structure.

[0096] The term "critical point" or "critical transition time point" as used herein refers to the critical state of transition from a chemical degradation process (such as hydrolytic degradation, oxidative degradation, etc.) involving no microorganisms to a biochemical process (biodegradation stage) involving microorganisms. The critical point is defined in the present invention as the time at which the chemical degradation process (such as hydrolytic degradation, oxidative degradation, etc.) involving no microorganisms changes. c .

[0097] As used herein, the term "substantially linear" means that a set of data points are substantially aligned in a straight line in a scatter plot. Specifically, a substantially linear relationship is defined by a linear fit where the residual sum of squares (RSS) obtained from the linear fit should be <0.05, <0.025, <0.01, or <0.001. As known to those skilled in the art, a linear relationship between two variables in a scatter plot includes both positive and negative correlations.

[0098] The validity of the results of the aerobic biodegradation test under controlled composting conditions obtained in step (1) of the method of the present invention can be evaluated according to methods known in the art, for example, according to the methods required in standards GB / T 19277.1 or GB / T 19277.2.

[0099] The plastic test material used in the present invention may be in a form known in the art for aerobic biodegradation testing under controlled composting conditions, and may be added in a solid form, typically in the form of a film, granules, powder, or a simple shape (e.g., dumbbell shape). Preferably, it is in the form of granules or powder, and more preferably in the form of granules, such as plastic masterbatch. Generally, the maximum surface area of each piece of plastic test material should not exceed 4 cm 2 , wherein if the size of the test material element exceeds the maximum surface area, the size may be reduced to meet the requirement. For example, the test material may be in the form of particles having a diameter of about 1 cm or less, such as particles having a diameter of less than about 9 mm, less than about 8 mm, less than about 7 mm, less than about 6 mm, less than about 5 mm, less than about 4 mm, less than about 3 mm, less than about 2 mm, or less.

[0100] According to the method of the first aspect of the present invention, the aerobic biodegradation test in step (1) can be carried out under conditions of constant temperature and darkness or dim light, and the constant temperature can be at least 45°C, at least 46°C, at least 47°C, at least 48°C, at least 49°C, at least 50°C, at least 51°C, at least 52°C, at least 53°C, at least 54°C, at least 55°C, at least 56°C, at least 57°C, at least 58°C, at least 59°C, at least 60°C or higher. Preferably, the aerobic biodegradation test can be carried out under conditions of a constant temperature of 58°C±2°C and darkness or dim light.

[0101] According to the method of the first aspect of the present invention, the time described in step (1) can be in minutes (m), hours (h), or days (d). In some preferred embodiments, the time is in days (d).

[0102] For the method according to the first aspect of the present invention, t in Equation 2 may be at least 1, at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, or at least 8 days. In some preferred embodiments, t may be at least 4 days, preferably at least 5 days, more preferably at least 6 days, particularly preferably at least 7 days, and most preferably at least 8 days.

[0103] For the method according to the first aspect of the present invention, the section divided in step (3) may contain at least 5 consecutive data points, preferably at least 6, more preferably at least 7, still more preferably at least 8, still more preferably at least 9, still more preferably at least 10, still more preferably at least 15, and still more preferably at least 20 consecutive data points.

[0104] For the method according to the first aspect of the present invention, the base of the logarithmic operation in step (2) should satisfy {a1>0 ∩ a1≠1 | a1∈R}, that is, a1>0 and not equal to 1. For example, a1>1, such as 2, 3, 4, 5, 6, 7, 8, 9, 10 or greater. Usually, it can be 10 or the natural constant e.

[0105] For the method according to the first aspect of the present invention, the parameter b1 in step (2) should satisfy That is In some embodiments, the parameter b1 may satisfy 0% < b1 < 100%, or 0% < b1 < 90%, or 1% < b1 < 60%, or 2% < b1 < 40%, or 5% < b1 < 20%, or b1 = 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 7%, 75%, 80%, 85%, 90%, or 95%.

[0106] In some embodiments of the present invention, the maximum value of the biodegradation rate obtained in step (1) of the method according to the first aspect may be less than 10%, less than 9%, less than 8%, less than 7%, less than 10%, less than 9%, less than 8%, less than 7%, less than 6%, less than 5%, less than 4.5%, less than 4%, less than 3.5%, less than 3%, less than 2.5%, less than 2%, or less than 1.5%.

[0107] In some embodiments of the present invention, the maximum value of the biodegradation rate obtained in step (1) of the method according to the first aspect may be at least 1%, at least 1.5%, at least 2%, at least 2.5%, at least 3%, at least 3.5%, at least 4%, at least 4.5%, at least 5%, at least 6%, at least 7%, at least 8%, at least 9%, or at least 10%.

[0108] In some embodiments of the present invention, the time t in step (1) of the method of the first aspect is n It can be at least 48 hours, at least 3, at least 4, at least 5, at least 10, at least 15, at least 20, at least 25, at least 30, at least 35, at least 45, at least 60 or at least 90 days.

[0109] According to the method of the second aspect of the present invention, the aerobic biodegradation test in step (1) can be carried out under conditions of constant high temperature and darkness or dim light, and the constant high temperature can be at least 45°C, at least 46°C, at least 47°C, at least 48°C, at least 49°C, at least 50°C, at least 51°C, at least 52°C, at least 53°C, at least 54°C, at least 55°C, at least 56°C, at least 57°C, at least 58°C, at least 59°C, at least 60°C or higher. Preferably, the aerobic biodegradation test can be carried out under conditions of a constant temperature of 58°C±2°C and darkness or dim light.

[0110] According to the method of the second aspect of the present invention, the time in step (1) can be in hours (h) or days (d). In some preferred embodiments, the time is in days (d).

[0111] According to the method of the second aspect of the present invention, the t corresponding to x1 in Equation 4 may be at least 1, at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, or at least 8 days. In some preferred embodiments, the t may be at least 4 days, preferably at least 5 days, more preferably at least 6 days, particularly preferably at least 7 days, and most preferably at least 8 days.

[0112] According to the method of the second aspect of the present invention, the segments divided in step (3) may contain at least 5 consecutive data points, preferably at least 6, more preferably at least 7, even more preferably at least 8, still more preferably at least 9, still more preferably at least 10, still more preferably at least 15, still more preferably at least 20 consecutive data points.

[0113] According to the method of the second aspect of the present invention, the base of the logarithmic operation in step (2) should satisfy {a2>0∩a2≠1|a2∈R}, that is, a2>0 and is not equal to 1, for example, a2>1, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10 or larger, usually 10 or the natural constant e.

[0114] According to the method of the second aspect of the present invention, the parameter b2 in step (2) should satisfy Right now In some embodiments, the parameter b2 may satisfy 0% < b2 < 100%, or 0% < b2 < 90%, or 1% < b2 < 60%, or 2% < b2 < 40%, or 5% < b2 < 20%, or b2 = 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95%.

[0115] In some embodiments of the present invention, the biodegradation rate is obtained in step (1) of the method of the second aspect The maximum value of may be less than 10%, less than 9%, less than 8%, less than 7%, less than 10%, less than 9%, less than 8%, less than 7%, less than 6%, less than 5%, less than 4.5%, less than 4%, less than 3.5%, less than 3%, less than 2.5%, less than 2%, or less than 1.5%.

[0116] In some embodiments of the present invention, the biodegradation rate is obtained in step (1) of the method of the second aspect The maximum value of may be at least 1%, at least 1.5%, at least 2%, at least 2.5%, at least 3%, at least 3.5%, at least 4%, at least 4.5%, at least 5%, at least 6%, at least 7%, at least 8%, at least 9%, or at least 10%.

[0117] In some embodiments of the present invention, the time t in step (1) of the method of the second aspect n May be at least 48 hours, at least 3, at least 4, at least 5, at least 10, at least 15, at least 20, at least 25, at least 30, at least 35, at least 45, at least 60 or at least 90 days.

[0118] According to the method of the third aspect of the present invention, the aerobic biodegradation test in step (1) can be carried out under conditions of constant high temperature and darkness or weak light, and the constant high temperature can be at least 45 °C, at least 46 °C, at least 47 °C, at least 48 °C, at least 49 °C, at least 50 °C, at least 51 °C, at least 52 °C, at least 53 °C, at least 54 °C, at least 55 °C, at least 56 °C, at least 57 °C, at least 58 °C, at least 59 °C, at least 60 °C or higher. Preferably, the aerobic biodegradation test can be carried out under conditions of a constant temperature of 58 °C ± 2 °C and darkness or weak light.

[0119] According to the method of the third aspect of the present invention, the reference material in step (1) can be any reference material known in the art for aerobic biodegradation tests, for example, it can be cellulose. In some embodiments of the present invention, the reference material can be α-cellulose powder with a particle size less than 25 μm.

[0120] For the method according to the third aspect of the present invention, the time described in step (1) may be in hours (h) or in days (d). In some preferred embodiments, the time is in days (d).

[0121] For the method according to the third aspect of the present invention, t in Equation 7 may be at least 1, at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, or at least 8 days. In some preferred embodiments, t may be at least 4 days, preferably at least 5 days, more preferably at least 6 days, particularly preferably at least 7 days, and most preferably at least 8 days.

[0122] For the method according to the third aspect of the present invention, the segments divided in step (3) may contain at least 5 consecutive data points, preferably at least 6, more preferably at least 7, still more preferably at least 8, still more preferably at least 9, still more preferably at least 10, still more preferably at least 15, and still more preferably at least 20 consecutive data points.

[0123] For the method according to the third aspect of the present invention, the base of the logarithmic operation in step (2) should satisfy {a3>0 ∩ a3≠1|a3∈R}, that is, a3>0 and not equal to 1. For example, a3>1, such as 2, 3, 4, 5, 6, 7, 8, 9, 10 or greater. Usually, it can be 10 or the natural constant e.

[0124] For the method according to the third aspect of the present invention, the parameter b3 in step (2) should satisfy That is In some embodiments, the parameter b3 may satisfy 0% < b3 < 100%, or 0% < b3 < 90%, or 1% < b3 < 60%, or 2% < b3 < 40%, or 5% < b3 < 20%, or b3 = 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95%.

[0125] In some embodiments of the present invention, the maximum value of the relative biodegradation rate obtained in step (1) of the method according to the third aspect may be less than 10%, less than 9%, less than 8%, less than 7%, less than 10%, less than 9%, less than 8%, less than 7%, less than 6%, less than 5%, less than 4.5%, less than 4%, less than 3.5%, less than 3%, less than 2.5%, less than 2%, or less than 1.5%.

[0126] In some embodiments of the present invention, the relative biodegradability is obtained in step (1) of the method of the third aspect. The maximum value may be at least 1%, at least 1.5%, at least 2%, at least 2.5%, at least 3%, at least 3.5%, at least 4%, at least 4.5%, at least 5%, at least 6%, at least 7%, at least 8%, at least 9%, or at least 10%.

[0127] In some embodiments of the present invention, the time t in step (1) of the method of the third aspect is n It can be at least 48 hours, at least 3, at least 4, at least 5, at least 10, at least 15, at least 20, at least 25, at least 30, at least 35, at least 45, at least 60 or at least 90 days.

[0128] According to the method of the fourth aspect of the present invention, the aerobic biodegradation test in step (1) can be carried out under conditions of a constant high temperature and darkness or dim light, and the constant high temperature can be at least 45°C, at least 46°C, at least 47°C, at least 48°C, at least 49°C, at least 50°C, at least 51°C, at least 52°C, at least 53°C, at least 54°C, at least 55°C, at least 56°C, at least 57°C, at least 58°C, at least 59°C, at least 60°C or higher. Preferably, the aerobic biodegradation test can be carried out under conditions of a constant temperature of 58°C±2°C and darkness or dim light.

[0129] According to the method of the fourth aspect of the present invention, the reference material in step (1) can be any reference material known in the art for use in aerobic biodegradation tests, for example, cellulose. In some embodiments of the present invention, the reference material can be α-cellulose powder with a particle size of less than 25 μm.

[0130] According to the method of the fourth aspect of the present invention, the time in step (1) can be in hours (h) or days (d). In some preferred embodiments, the time is in days (d).

[0131] According to the method of the fourth aspect of the present invention, the t corresponding to x2 in Equation 9 may be at least 1, at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, or at least 8 days. In some preferred embodiments, the t may be at least 4 days, preferably at least 5 days, more preferably at least 6 days, particularly preferably at least 7 days, and most preferably at least 8 days.

[0132] According to the method of the fourth aspect of the present invention, the segments divided in step (3) may contain at least 5 consecutive data points, preferably at least 6, more preferably at least 7, still more preferably at least 8, still more preferably at least 9, still more preferably at least 10, still more preferably at least 15, still more preferably at least 20 consecutive data points.

[0133] According to the method of the fourth aspect of the present invention, the base of the logarithmic operation in step (2) should satisfy {a4>0 ∩ a4≠1|a4∈R}, that is, a4>0 and not equal to 1. For example, a4>1, such as 2, 3, 4, 5, 6, 7, 8, 9, 10 or greater. Usually, it can be 10 or the natural constant e.

[0134] According to the method of the fourth aspect of the present invention, the parameter b4 in step (2) should satisfy That is In some embodiments, the parameter b4 may satisfy 0% < b4 < 100%, or 0% < b4 < 90%, or 1% < b4 < 60%, or 2% < b4 < 40%, or 5% < b4 < 20%, or b4 = 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95%.

[0135] In some embodiments of the present invention, the relative biodegradation rate is obtained in step (1) of the method of the fourth aspect The maximum value of which may be less than 10%, less than 9%, less than 8%, less than 7%, less than 10%, less than 9%, less than 8%, less than 7%, less than 6%, less than 5%, less than 4.5%, less than 4%, less than 3.5%, less than 3%, less than 2.5%, less than 2%, or less than 1.5%.

[0136] In some embodiments of the present invention, the relative biodegradation rate is obtained in step (1) of the method of the fourth aspect <00004​​​​​​

[0138] Example

[0139] In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

[0140] The materials and test instruments used in the aerobic biodegradation tests in Examples 1 to 4 are shown below:

[0141] -Testing instrument: Bioprocess Control Sweden AB's Gas Endeavour biodegradation test system;

[0142] -Plastic: All are polyester plastics, specifically poly (L-lactic acid) resin (PLA, CAS: 26100-51-6, molecular formula (C3H4O2) n ), the dosage is 7.5g, in the form of particles with a diameter of about 3mm, wherein the melting point of poly (L-lactic acid) resin 1# is 160.0℃, the melt index is 17.1g / 10min (190℃, 2.16kg), the molecular weight distribution index is 1.65, the glass transition temperature (T g ) is 58.7°C and the density is 1.25g / cm 3 , lactide content is 0.33%, the melting point of poly (L-lactic acid) resin 2# is 174.6℃, the melt index is 4.9g / 10min (190℃, 2.16kg), the molecular weight distribution index is 1.58, the glass transition temperature (T g ) is 59.9℃ and the density is 1.25g / cm 3 , lactide content is 0.11%, the melting point of poly (L-lactic acid) resin 3# is 177.3℃, the melt index is 4.6g / 10min (190℃, 2.16kg), the molecular weight distribution index is 1.62, and the glass transition temperature (T g ) is 60.8℃ and the density is 1.25g / cm 3 , lactide content is 0.20%, the performance index test method of the above poly (L-lactic acid) resin refers to the national standard GB / T 29284-2024 "polylactic acid"; the modified polylactic acid resin, the amount is 7.5g, in the form of particles with a diameter of about 3mm, including 181 type modified polylactic acid resin.

[0143] -Inoculum: All were aerobic compost from Bipu Instrument (Zhejiang) Co., Ltd., with a dosage of 500g;

[0144] - Reference material: cellulose powder (α-cellulose powder, CAS: 9004-34-6, particle size ≤ 25 μm) from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0145] -Digestion vessel: 1L Schott blue cap glass reagent bottle.

[0146] Example 1

[0147] According to GB / T 19277.1 "Determination of the ultimate aerobic biodegradability of materials under controlled composting conditions by determination of released carbon dioxide - Part 1: General method", poly (L-lactic acid) resin 1# was tested for aerobic biodegradation under controlled composting conditions. α-cellulose powder was used as the reference material and the test was conducted at a temperature of 58°C ± 2°C under low light conditions. The cumulative carbon dioxide gas release in each digestion container was counted and recorded on a daily basis, and the biodegradation rate of the test material was calculated.

[0148] Through logarithmic operation, the above Convert to Where a1=10, b1=1%, and a scatter plot of y1 versus t is drawn. Figure 1 As shown. Figure 1 It can be clearly observed from the scatter plot that the segment (i) corresponding to the continuous data points of 13 days ≤ t ≤ 18 days is basically linear, and compared with other segments, y1 in segment (i) has a more significant positive linear correlation with t, that is, the slope of its linear fit is larger. In addition, on the left side of the above segment (i), the segment (ii) corresponding to the continuous data points of 3 days ≤ t ≤ 9 days is also basically linear, and compared with other segments, y1 in segment (ii) has a more significant negative linear correlation with t, that is, the slope of its linear fit is smaller. Linear fitting is performed on the data points of the above two segments respectively, and the corresponding linear equation Y is obtained. 1A =0.06137t-2.05894, and the residual sum of squares is 7.99182×10 -4 , and Y 1B =-0.00083t-1.43625, and the residual sum of squares is 0.00188. The intersection of the two straight lines is obtained by linear extrapolation, and the critical point time t is obtained. c1 =10.02d, the slope of the linear region to the left of the critical point is k 1B =-0.00083d -1, the slope k of the linear region to the right of the critical point 1A =0.06137d -1 .

[0149] Example 2

[0150] According to ISO 14855-1 "Determination of the ultimate aerobic biodegradability of plastic materials under controlled composting conditions - Method by analysis of evolved carbon dioxide - Part 1: General method", poly (L-lactic acid) resin 2# was subjected to aerobic biodegradation testing, using α-cellulose powder as the reference material. The test was conducted at a temperature of 58°C ± 2°C under low light conditions. The cumulative carbon dioxide gas release in each digestion container was counted and recorded on a daily basis, and the biodegradation rate of the test material was calculated.

[0151] Through logarithmic operation, the above and time t are converted into and Where a2 = e (natural constant), b2 = 10%, and a scatter plot of y2 versus x1 is drawn. The scatter plot is as follows: Figure 2 As shown. Figure 2 It can be clearly observed from the scatter plot that the segment (i) corresponding to the continuous data points of 3.13549≤x1≤3.82864 (i.e. 22 days≤t≤45 days) is basically linear, and compared with other segments, y2 and x1 in segment (i) have a more significant positive linear correlation, that is, the slope of its linear fit is larger. In addition, on the left side of the above segment (i), the segment (ii) corresponding to the continuous data points of 2.19722≤x1≤2.89037 (i.e. 8 days≤t≤17 days) is also basically linear, and compared with other segments, y2 and x1 in segment (ii) have a more significant negative linear correlation, that is, the slope of its linear fit is smaller. Linear fitting is performed on the data points of the above two segments respectively, and the corresponding linear equation Y is obtained. 2A =1.30844x1-7.18075, the residual sum of squares is 0.03784, and Y 2B =-0.93412x1-0.43712, and the residual sum of squares is 0.00218. By linear extrapolation, we can get the intersection of the two straight lines and obtain x c2 =3.0089, that is, the critical point time tc2 =19.27d, the slope of the linear region to the left of the critical point is k 2B =-0.93412d -1 , the slope k of the linear region to the right of the critical point 2A =1.30844d -1 .

[0152] Example 3

[0153] Aerobic biodegradability tests were conducted on poly(L-lactic acid) resin 3# in accordance with EN ISO 14855-1, "Determination of the ultimate aerobic biodegradability of plastic materials under controlled composting conditions - Method by analysis of evolved carbon dioxide - Part 1: General method." α-cellulose powder was used as the reference material. The tests were conducted at a temperature of 58°C ± 2°C and under low light conditions. The cumulative carbon dioxide gas release in each digestion container was counted and recorded on a daily basis, and the biodegradation rate of the test material was calculated. and relative biodegradability

[0154] Through logarithmic operation, the above Convert to Where a3 = e (natural constant), b3 = 10%, and a scatter plot of y3 versus t is drawn. The scatter plot is as follows: Figure 3 As shown. Figure 3 It can be clearly observed from the scatter plot that the segment (i) corresponding to the continuous data points of 28 days ≤ t ≤ 41 days is basically linear, and compared with other segments, y3 in segment (i) has a more significant positive linear correlation with t, that is, the slope of its linear fit is larger. In addition, on the left side of the above segment (i), the segment (ii) corresponding to the continuous data points of 8 days ≤ t ≤ 16 days is also basically linear, and compared with other segments that can be linearly fitted, y3 in segment (ii) has a more significant negative linear correlation with t, that is, the slope of its linear fit is smaller. Linear fitting is performed on the data points of the above two segments respectively, and the corresponding linear equation Y is obtained. 3A =0.05758t-4.56372, the residual sum of squares is 0.03572, and Y 3B =-0.05612t-2.17358, and the residual sum of squares is 0.02663. The intersection of the two straight lines is obtained by linear extrapolation, and the critical point time t is obtained. c3=21.02d, the slope of the linear region to the left of the critical point is k 3B =-0.05612d -1 , the slope k of the linear region to the right of the critical point 3A =0.05758d -1 .

[0155] Example 4

[0156] According to DIN EN ISO 14855-1 “Determination of the ultimate aerobic biodegradability of plastic materials under controlled composting conditions-Method by analysis of evolved carbon dioxide-Part 1: General method”, the aerobic biodegradability of plastic materials from Zhejiang Hisun Biomaterials Co., Ltd. was analyzed. Aerobic biodegradation tests were conducted on 181 type modified polylactic acid resin, using α-cellulose powder as the reference material, at a temperature of 58°C ± 2°C under weak light conditions. The cumulative carbon dioxide gas release in each digestion container was counted and recorded in units of days (d), and the biodegradation rate of the test material was calculated. and relative biodegradability

[0157] Through logarithmic operation, the above Convert to and Where a4=10, b2=15%, and a scatter plot of y4 versus x2 is drawn. Figure 4 As shown. Figure 4 It can be clearly observed from the scatter plot that the segment (i) corresponding to the continuous data points of 1.25527≤x2≤1.59106 (i.e. 17 days≤t≤38 days) is basically linear, and compared with other segments, y4 in segment (i) has a more significant positive linear correlation with x2, that is, the slope of its linear fit is larger. In addition, on the left side of the above segment (i), the segment (ii) corresponding to the continuous data points of 0.8451≤x2≤1.25527 (i.e. 6 days≤t≤17 days) is also basically linear, and compared with other segments that can be linearly fitted, y4 in segment (ii) has a more significant negative linear correlation with x2, that is, the slope of its linear fit is smaller. Linear fitting is performed on the data points of the above two segments respectively, and the corresponding linear equation Y is obtained. 4A =1.55824x2-3.12165, the residual sum of squares is 0.01192, and Y4B =-0.65664x2-0.36744, and the residual sum of squares is 0.0037. By linear extrapolation, we can get the intersection of the two straight lines and obtain x c4 =1.2439, that is, the critical point time t c4 =16.53d, the slope of the linear region to the left of the critical point is k 4B =-0.65664d -1 , the slope k of the linear region to the right of the critical point 4A =1.55824d -1 .

[0158] As can be seen from Examples 1 to 4, when processing the initial data of the complex aerobic biodegradation test of plastics, the method of the present invention can simply convert the "rough" raw data reflecting the initial aerobic degradation characteristics of the degradable plastic into an accurate mathematical equation through the linear fitting operation, and then use this mathematical equation to clearly define and calculate the output results reflecting the corresponding degradation characteristics of the degradable plastic. It is believed that t c The larger the value, the better the plastic's resistance to chemical degradation.

Claims

1. A method for analyzing and evaluating the degradation resistance of plastics based on the linear extrapolation method of aerobic biodegradation test results under controlled composting conditions, characterized in that: The method comprises the following steps: (1) conducting aerobic biodegradation tests on plastics under controlled composting conditions and obtaining the results of said tests, Wherein, the plastic is i The biodegradation rate (%) of |i=1,2,3,...,n} is recorded as (2) performing data processing and graphing on the biodegradability of the plastic, Among them, the logarithmic operation is used to convert the obtained value in step (1) into Convert to And draw a scatter plot of y1 with respect to t, and record the scatter plot as P1={(y 1i ,t i )|i=1,2,3,...,n}, where {a1>0∩a1≠1|a1∈R}, that is, a1>0 and not equal to 1, and Right now (3) Perform linear fitting and linear extrapolation on the scatter plot P1 in step (2), The scatter plot R1 is divided into at least two segments that are substantially linear and contain as many consecutive data points as possible. A linear fit is performed on the data points of each segment, and the data point of the segment with the largest slope of the linear fit is recorded as P. 1A , its linear fitting equation is expressed as Equation 1: Y 1A =k 1A t+c 1A Equation 1 P 1A The data point of the segment with the smallest slope of the linear fit on the left is recorded as P 1B , its linear fitting equation is expressed as Equation 2: Y 1B =k 1B t+c 1B Equation 2 where k 1A >0, and k 1A >k 1B , And wherein, the straight lines described by equation 1 and equation 2 are linearly extrapolated to obtain the intersection point, and the time t corresponding to the intersection point is obtained. c1 ;and (4) Output analysis results, The result includes the parameter t obtained in step (3) c1 .

2. The method according to claim 1, characterized in that The result of step (4) also includes k 1A and / or k 1B .

3. The method according to claim 1, characterized in that The aerobic biodegradation test in step (1) is carried out at a constant temperature of 58°C ± 2°C and in darkness or dim light.

4. The method according to claim 1, wherein The time described in step (1) is in days (d).

5. The method according to claim 4, characterized in that The t in Equation 2 is at least 4 days.

6. The method according to claim 4, characterized in that The t in Equation 2 is at least 5 days.

7. The method according to claim 4, characterized in that The t in Equation 2 is at least 6 days.

8. The method according to claim 4, characterized in that The t in Equation 2 is at least 7 days.

9. The method according to claim 4, characterized in that The t in Equation 2 is at least 8 days.

10. The method according to any one of claims 4 to 9, characterized in that The segment divided in step (3) contains at least 6 consecutive data points.

11. The method according to any one of claims 4 to 9, characterized in that The segment divided in step (3) contains at least 7 consecutive data points.

12. The method according to any one of claims 4 to 9, characterized in that The segment divided in step (3) contains at least 8 consecutive data points.

13. The method according to any one of claims 4 to 9, characterized in that The segment divided in step (3) contains at least 9 consecutive data points.

14. The method according to any one of claims 4 to 9, characterized in that The segment divided in step (3) contains at least 10 consecutive data points.

15. The method according to any one of claims 4 to 9, characterized in that The segment divided in step (3) contains at least 15 consecutive data points.

16. The method according to any one of claims 1 to 9, characterized in that The base a1 of the logarithm operation in step (2) is >1.

17. The method according to any one of claims 1 to 9, characterized in that The base a1 of the logarithm operation in step (2) is 10 or the natural constant e.

18. The method according to any one of claims 1 to 9, characterized in that The parameter b1 in step (2) satisfies 0% <b1<100%。 19. The method according to any one of claims 1 to 9, characterized in that The parameter b1 in step (2) satisfies 0% <b1<90%。 20. The method according to any one of claims 1 to 9, characterized in that The parameter b1 in step (2) satisfies 1% <b1<60%。 21. The method according to any one of claims 1 to 9, characterized in that The parameter b1 in step (2) satisfies 2% <b1<40%。 22. The method according to any one of claims 1 to 9, characterized in that The parameter b1 in step (2) satisfies 5% <b1<20%。 23. The method according to any one of claims 1 to 9, characterized in that The parameter b1 in step (2) satisfies b1=1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95%.

24. A method for analyzing and evaluating the degradation resistance of plastics based on the linear extrapolation method of aerobic biodegradation test results under controlled composting conditions, characterized in that: The method comprises the following steps: (1) conducting aerobic biodegradation tests on plastics under controlled composting conditions and obtaining the results of said tests, Wherein, the plastic is i The biodegradation rate (%) of |i=1,2,3,...,n} is recorded as (2) performing data processing and graphing on the biodegradability of the plastic, Among them, the logarithmic operation is used to convert the obtained value in step (1) into Convert to And convert time t into And draw a scatter plot of y2 relative to x1, and record the scatter plot as P2={(y 2i ,x 1i )|i=1,2,3,...,n}, where {a2>0∩a2≠1|a2∈R}, that is, a2>0 and not equal to 1, and Right now (3) Perform linear fitting and linear extrapolation on the scatter plot P2 in step (2), The scatter plot P2 is divided into at least two segments that are substantially linear and contain as many consecutive data points as possible. A linear fit is performed on the data points of each segment, and the data point of the segment with the largest slope of the linear fit is recorded as P. 2A , its linear fitting equation is expressed as Equation 3: Y 2A =k 2A x1+c 2A Equation 3 P 2A The data point of the segment with the smallest slope of the linear fit on the left is recorded as P 2B , its linear fitting equation is expressed as Equation 4: Y 2B =k 2B x1+c 2B Equation 4 where k 2A >0, and k 2A >k 2B , And wherein, the straight lines described by equation 3 and equation 4 are linearly extrapolated to obtain the intersection point, and the x corresponding to the intersection point is obtained. c2 and by the equation Obtain the time t corresponding to the intersection point c2 ;and (4) Output analysis results, The result includes the parameter t obtained in step (3) c2 .

25. The method according to claim 24, characterized in that The result of step (4) also includes k 2A and / or k 2B .

26. The method according to claim 24, characterized in that The aerobic biodegradation test in step (1) is carried out at a constant temperature of 58°C ± 2°C and in darkness or dim light.

27. The method according to claim 24, characterized in that The time described in step (1) is in days (d).

28. The method according to claim 27, characterized in that The t corresponding to x1 in equation 4 is at least 4 days.

29. The method according to claim 27, characterized in that The t corresponding to x1 in Equation 4 is at least 5 days.

30. The method according to claim 27, wherein The t corresponding to x1 in Equation 4 is at least 6 days.

31. The method according to claim 27, wherein The t corresponding to x1 in Equation 4 is at least 7 days.

32. The method according to claim 27, wherein The t corresponding to x1 in Equation 4 is at least 8 days.

33. The method according to any one of claims 27 to 32, characterized in that The segment divided in step (3) contains at least 6 consecutive data points.

34. The method according to any one of claims 27 to 32, characterized in that The segment divided in step (3) contains at least 7 consecutive data points.

35. The method according to any one of claims 27 to 32, characterized in that The segment divided in step (3) contains at least 8 consecutive data points.

36. The method according to any one of claims 27 to 32, characterized in that The segment divided in step (3) contains at least 9 consecutive data points.

37. The method according to any one of claims 27 to 32, characterized in that The segment divided in step (3) contains at least 10 consecutive data points.

38. The method according to any one of claims 27 to 32, characterized in that The segment divided in step (3) contains at least 15 consecutive data points.

39. The method according to any one of claims 24 to 32, characterized in that The base a2 of the logarithm operation in step (2) is >1.

40. The method according to any one of claims 24 to 32, characterized in that The base a2 of the logarithm operation in step (2) is 10 or the natural constant e.

41. The method according to any one of claims 24 to 32, characterized in that The parameter b2 in step (2) satisfies 0% <b2<100%。 42. The method according to any one of claims 24 to 32, characterized in that The parameter b2 in step (2) satisfies 0% <b2<90%。 43. The method according to any one of claims 24 to 32, characterized in that The parameter b2 in step (2) satisfies 1% <b2<60%。 44. The method according to any one of claims 24 to 32, characterized in that The parameter b2 in step (2) satisfies 2% <b2<40%。 45. The method according to any one of claims 24 to 32, characterized in that The parameter b2 in step (2) satisfies 5% <b2<20%。 46. The method according to any one of claims 24 to 32, characterized in that The parameter b2 in step (2) satisfies b2=1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95%.

47. A method for analyzing and evaluating the degradation resistance of plastics based on the linear extrapolation method of aerobic biodegradation test results under controlled composting conditions, characterized in that: The method comprises the following steps: (1) conducting aerobic biodegradation tests on plastics under controlled composting conditions and obtaining the results of said tests, Wherein, the plastic and the reference material are i The biodegradation rates (%) of |i=1,2,3,...,n} are respectively expressed as and The relative biodegradation rate of the plastic is further obtained according to Equation 5: (2) performing data processing and graphing on the relative biodegradability of the plastic, Among them, the logarithmic operation is used to convert the Convert to And draw a scatter plot of y3 with respect to t, and record the scatter plot as P3={(y 3i ,t i )|i=1,2,3,...,n}, where {a3>0∩a3≠1|a3∈R}, that is, a3>0 and not equal to 1, and Right now (3) Perform linear fitting and linear extrapolation on the scatter plot P3 in step (2), The scatter plot P3 is divided into at least two segments that are substantially linear and contain as many consecutive data points as possible. A linear fit is performed on the data points of each segment, and the data point of the segment with the largest slope of the linear fit is recorded as P. 3A , and its linear fitting equation is expressed as Equation 6: Y 3A =k 3A t+c 3A Equation 6 P 3A The data point of the segment with the smallest slope of the linear fit on the left is recorded as P 3B , its linear fitting equation is expressed as Equation 7: Y 3B =k 3B t+c 3B Equation 7 where k 3A >0, and k 3A >k 3B , And wherein, the straight lines described by equation 6 and equation 7 are linearly extrapolated to obtain their intersection, and the time t corresponding to the intersection is obtained. c3 ;and (4) Output analysis results, The result includes the parameter t obtained in step (3) c3 .

48. The method according to claim 47, wherein The result of step (4) also includes k 3A and / or k 3B .

49. The method according to claim 47, wherein The aerobic biodegradation test in step (1) is carried out at a constant temperature of 58°C ± 2°C and in darkness or dim light.

50. The method according to claim 47, wherein The reference material in step (1) is α-cellulose powder with a particle size of less than 25 μm.

51. The method according to claim 47, wherein The time described in step (1) is in days (d).

52. The method according to claim 51, characterized in that The t in Equation 7 is at least 4 days.

53. The method according to claim 51, characterized in that The t in Equation 7 is at least 5 days.

54. The method according to claim 51, characterized in that The t in Equation 7 is at least 6 days.

55. The method according to claim 51, wherein The t in Equation 7 is at least 7 days.

56. The method according to claim 51, wherein The t in Equation 7 is at least 8 days.

57. The method according to any one of claims 51 to 56, characterized in that The segment divided in step (3) contains at least 6 consecutive data points.

58. The method according to any one of claims 51 to 56, characterized in that The segment divided in step (3) contains at least 7 consecutive data points.

59. The method according to any one of claims 51 to 56, characterized in that The segment divided in step (3) contains at least 8 consecutive data points.

60. The method according to any one of claims 51 to 56, characterized in that The segment divided in step (3) contains at least 9 consecutive data points.

61. The method according to any one of claims 51 to 56, characterized in that The segment divided in step (3) contains at least 10 consecutive data points.

62. The method according to any one of claims 51 to 56, characterized in that The segment divided in step (3) contains at least 15 consecutive data points.

63. The method according to any one of claims 47 to 56, characterized in that The base a3 of the logarithm operation in step (2) is >1.

64. The method according to any one of claims 47 to 56, wherein: The base a3 of the logarithm operation in step (2) is 10 or the natural constant e.

65. The method according to any one of claims 47 to 56, characterized in that The parameter b3 in step (2) satisfies 0% <b3<100%。 66. The method according to any one of claims 47 to 56, characterized in that The parameter b3 in step (2) satisfies 0% <b3<90%。 67. The method according to any one of claims 47 to 56, characterized in that The parameter b3 in step (2) satisfies 1% <b3<60%。 68. The method according to any one of claims 47 to 56, characterized in that The parameter b3 in step (2) satisfies 2% <b3<40%。 69. The method according to any one of claims 47 to 56, characterized in that The parameter b3 in step (2) satisfies 5% <b3<20%。 70. The method according to any one of claims 47 to 56, characterized in that The parameter b3 in step (2) satisfies b3=1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95%.

71. A method for analyzing and evaluating the degradation resistance of plastics based on the linear extrapolation method of aerobic biodegradation test results under controlled composting conditions, characterized in that: The method comprises the following steps: (1) conducting aerobic biodegradation tests on plastics under controlled composting conditions and obtaining the results of said tests, Wherein, the plastic and the reference material are i The biodegradation rates (%) of |i=1,2,3,...,n} are respectively expressed as and The relative biodegradation rate of the plastic is further obtained according to Equation 5: (2) performing data processing and graphing on the biodegradability of the plastic, Among them, the logarithmic operation is used to convert the obtained value in step (1) into Convert to And convert time t into And draw a scatter plot of y4 relative to x2, and record the scatter plot as P4={(y 4i ,x 2i )|i=1,2,3,...,n}, where {a4>0∩a4≠1|a4∈R}, that is, a4>0 and not equal to 1, and Right now (3) Perform linear fitting and linear extrapolation on the scatter plot P4 in step (2), The scatter plot P4 is divided into at least two segments that are substantially linear and contain as many consecutive data points as possible. A linear fit is performed on the data points of each segment, and the data point of the segment with the largest slope of the linear fit is recorded as P. 4A , its linear fitting equation is expressed as Equation 8: Y 4A =k 4A x2+c 4A Equation 8 P 4A The data point of the segment with the smallest slope of the linear fit on the left is recorded as P 4b , its linear fitting equation is expressed as Equation 9: Y 4B =k 4B x2+c 4B Equation 9 where k 4A >0, and k 4A >k 4B , And wherein, the straight lines described by equation 8 and equation 9 are linearly extrapolated to obtain their intersection point, and the x corresponding to the intersection point is obtained. c4 and by the equation Obtain the time t corresponding to the intersection point c4 ;and (4) Output analysis results, The result includes the parameter t obtained in step (3) c4 .

72. The method according to claim 71, characterized in that The result of step (4) also includes k 4A and / or k 4B .

73. The method according to claim 71, characterized in that The aerobic biodegradation test in step (1) is carried out at a constant temperature of 58°C ± 2°C and in darkness or dim light.

74. The method according to claim 71, characterized in that The reference material in step (1) is α-cellulose powder with a particle size of less than 25 μm.

75. The method according to claim 71, wherein The time described in step (1) is in days (d).

76. The method according to claim 75, characterized in that The t corresponding to x2 in Equation 9 is at least 4 days.

77. The method according to claim 75, characterized in that The t corresponding to x2 in Equation 9 is at least 5 days.

78. The method according to claim 75, characterized in that The x2 in Equation 9 corresponds to t of at least 6 days.

79. The method according to claim 75, characterized in that The x2 in Equation 9 corresponds to t of at least 7 days.

80. The method of claim 75, wherein: The t corresponding to x2 in Equation 9 is at least 8 days.

81. The method according to any one of claims 75 to 80, wherein: The segment divided in step (3) contains at least 6 consecutive data points.

82. The method according to any one of claims 75 to 80, wherein: The segment divided in step (3) contains at least 7 consecutive data points.

83. The method according to any one of claims 75 to 80, wherein: The segment divided in step (3) contains at least 8 consecutive data points.

84. The method according to any one of claims 75 to 80, wherein: The segment divided in step (3) contains at least 9 consecutive data points.

85. The method according to any one of claims 75 to 80, wherein: The segment divided in step (3) contains at least 10 consecutive data points.

86. The method according to any one of claims 75 to 80, wherein: The segment divided in step (3) contains at least 15 consecutive data points.

87. The method according to any one of claims 71 to 80, characterized in that The base a4 of the logarithm operation in step (2) is >1.

88. The method according to any one of claims 71 to 80, characterized in that The base a4 of the logarithm operation in step (2) is 10 or the natural constant e.

89. The method according to any one of claims 71 to 80, characterized in that The parameter b4 in step (2) satisfies 0% <b4<100%。 90. The method according to any one of claims 71 to 80, characterized in that The parameter b4 in step (2) satisfies 0% <b4<90%。 91. The method according to any one of claims 71 to 80, wherein: The parameter b4 in step (2) satisfies 1% <b4<60%。 92. The method according to any one of claims 71 to 80, characterized in that The parameter b4 in step (2) satisfies 2% <b4<40%。 93. The method according to any one of claims 71 to 80, characterized in that The parameter b4 in step (2) satisfies 5% <b4<20%。 94. The method according to any one of claims 71 to 80, characterized in that The parameter b4 in step (2) satisfies b4=1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95%.

95. A system for evaluating the anti-degradation performance of plastics, characterized in that: The system employs a method according to any one of the preceding claims.

96. A computer device, characterized in that It includes: processor; and a memory for storing executable instructions; The processor is configured to read and execute the executable instructions from the memory to implement the method according to any one of claims 1 to 94.

97. A computer-readable storage medium, characterized in that It stores a computer program, which, when executed by a processor, enables the method according to any one of claims 1 to 94 to be implemented.

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