CN115144499A - Method for discriminating degradable plastic and product thereof and application - Google Patents

Method for discriminating degradable plastic and product thereof and application Download PDF

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CN115144499A
CN115144499A CN202210781578.XA CN202210781578A CN115144499A CN 115144499 A CN115144499 A CN 115144499A CN 202210781578 A CN202210781578 A CN 202210781578A CN 115144499 A CN115144499 A CN 115144499A
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temperature
products
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plastics
degradable
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潘斐
许越超
董晓明
袁翔
姚杰
胡广君
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CR Chemical Materials Technology Inc
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N30/04—Preparation or injection of sample to be analysed
    • G01N30/06—Preparation
    • G01N30/12—Preparation by evaporation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N30/62—Detectors specially adapted therefor
    • G01N30/72—Mass spectrometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N2030/022—Column chromatography characterised by the kind of separation mechanism
    • G01N2030/025—Gas chromatography
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N30/04—Preparation or injection of sample to be analysed
    • G01N30/06—Preparation
    • G01N30/12—Preparation by evaporation
    • G01N2030/125—Preparation by evaporation pyrolising

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Abstract

The invention discloses a method for discriminating degradable plastics and products thereof, belonging to the technical field of analysis and detection; the method comprises the steps of (1) thermally cracking plastics and products thereof; (2) Testing the thermal cracking product by a gas chromatography-mass spectrometer, and analyzing a chromatogram so as to finish the discrimination of the degradable plastic and the product thereof; the test conditions in the gas chromatograph-mass spectrometer test are as follows: carrier gas and mode: helium and constant current; column flow rate: 1-1.5mL/min; temperature rising procedure: maintaining at 40-50 deg.C for 1-3min, heating to 290-300 deg.C at 15-25 deg.C/min, and maintaining for 8-12min; sample inlet temperature: 300-320 ℃; sample introduction mode: split-flow sample injection with a split-flow ratio of 100 (1-1.2); transmission line temperature: 300-305 ℃; ion source temperature: 300-305 ℃; scanning mode: EI, full Scan (35-500 m/z). By adopting the technical scheme of the invention, all characteristic peaks can be collected within 30 min; therefore, the method for discriminating the degradable plastic and the product thereof provided by the invention is simple, rapid, accurate and high in universality.

Description

Method for discriminating degradable plastic and product thereof and application
Technical Field
The invention belongs to the technical field of analysis and detection, and particularly relates to a method for discriminating degradable plastics and products thereof and application thereof.
Background
The polymer material has excellent mechanical property and thermal property, is stable to use and is ubiquitous in human life, so that the polymer material is greatly convenient for human life, and particularly, the polyester material mainly takes polyethylene terephthalate (PET) and has stable mechanical property and thermal property, no toxicity and transparency, so that the polymer material is widely applied to the fields of packaging materials, textile materials, electronic materials and the like. However, due to its excellent stability, plastics can be stably present in nature for a long period of time, in short, for decades, and in long, for hundreds of years, without completely decomposing naturally, eventually forming "white pollution". In the process, the 'white pollution' can not only seriously damage the natural environment and the ecological system, but also can finally enter human bodies through an ecological chain, and is harmful to the life health of human beings. Only China has the total output of plastic product industry in each year, and as can be imagined, the earth bears great environmental pressure. Therefore, the 'plastic limit' and 'plastic forbidding' orders are actively issued and implemented all over the world, and the degradable polyester material is vigorously developed.
At present, the number of degradable plastics which can be actually produced industrially is still small, for example, poly (butylene adipate terephthalate) (PBAT), poly (butylene succinate) (PBS), poly (lactic acid) (PLA) and the like, and the environmental protection concept is pushed forward by national decisions, and after non-degradable plastic products are forbidden, various manufacturers start to produce more environment-friendly plastic bags. However, the standards of the novel plastic bags are not completely unified, so that the quality of the current shopping bags is uneven. The degradable shopping bags are produced by different families, and even some merchants can buy the bags for getting violence and sell the bags at high price by directly marking the degradable labels on the common shopping bags. The result of this is that the ecological environment continues to deteriorate, and the goal of protecting the environment is gradually going far away.
Therefore, how to distinguish between true and false degradable plasticsThis is particularly important. In fact, the complete degradation of plastic products is a complex physical, chemical and biological process, generally, plastic products are first subjected to the action of heat, oxygen, microorganisms and the like, become thin and brittle, and then become finer fragments, at the moment, high molecular long chains are broken into low molecular oligomers, then microorganisms further decompose the low molecular oligomers, carbon in the low molecular oligomers is converted into inorganic state from organic state, and finally carbon dioxide (CO) is converted 2 ) Methane (CH) 4 ) And water (H) 2 O), this process is called final biological decomposition. The current method for detecting degradable plastics is mainly to collect or measure CO generated in the decomposition process 2 And methane (CH) 4 ) And calculating its CO release by detecting the initial content of total organic carbon in the material 2 Or/and methane (CH) 4 ) The ratio of the two is used as the biodegradation rate of the plastic, so as to judge whether the material is degradable plastic. The method has good accuracy, but the testing time is too long, namely one month or two months for short and more than half a year for long, so that the significance of developing an accurate, efficient and rapid identification method is great.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method and application for accurately, efficiently and quickly discriminating degradable plastics and products thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: a method of screening degradable plastics and articles thereof, the method comprising the steps of:
(1) Thermally cracking plastics and products thereof;
(2) Testing the thermal cracking product by a gas chromatography-mass spectrometer, and analyzing a chromatogram so as to finish the discrimination of the degradable plastic and the product thereof;
the test conditions in the gas chromatography-mass spectrometer test are as follows;
and (3) chromatographic column: TG-5SilMS (30m 0.25mm 0.25um);
carrier gas and mode: helium and constant current;
column flow rate: 1-1.5mL/min;
temperature rising procedure: maintaining at 40-50 deg.C for 1-3min, heating to 290-300 deg.C at 15-25 deg.C/min, and maintaining for 8-12min;
sample inlet temperature: 300-320 ℃;
sample introduction mode: split-flow sample injection with a split-flow ratio of 100 (1-1.2);
transmission line temperature: 295 to 305 ℃;
ion source temperature: 295 to 305 ℃;
scanning mode: EI, full Scan (35-500 m/z).
According to the method for discriminating the degradable plastics and the products thereof, provided by the invention, the plastic and the products thereof are researched and analyzed by adopting a thermal cracking combined gas chromatography-mass spectrometer, so that various plastics and products thereof can be analyzed under the same condition provided by the invention, and the discrimination method does not need to be changed according to the change of the plastics and the products thereof, so that the method provided by the invention has universality; meanwhile, the method provided by the invention does not need to carry out complex and time-consuming sample treatment, the sample directly enters the cracking furnace, and enters the gas chromatography-mass spectrometer for characteristic peak collection after cracking, under the conditions of gas chromatography and mass spectrometry provided by the invention, most of cracked characteristic products of the plastic and products thereof can generate peaks within 20min, and then the corresponding characteristic peaks are analyzed, so that the types of the plastic and whether the plastic has degradability or not are obtained.
As a preferred embodiment of the method of the present invention, the test conditions in the GC MS test are as follows;
column flow rate: 1.0mL/min;
temperature rising procedure: maintaining at 50 deg.C for 2min, heating to 300 deg.C at 20 deg.C/min, and maintaining for 10min;
sample inlet temperature: 300 ℃;
sample introduction mode: split-flow sample injection is carried out, and the split-flow ratio is 100;
transmission line temperature: 300 ℃;
ion source temperature: at 300 deg.c.
The inventor researches and discovers that under the conditions of gas chromatography and mass spectrometry, the analysis time of various plastics and products thereof can be controlled within 30 minutes, and the efficiency of the method is remarkably improved.
As a preferred embodiment of the process according to the invention, the thermal cracking temperature is from 500 to 650 ℃.
As a preferred embodiment of the process according to the invention, the thermal cracking time is from 0.1 to 0.4min.
As a preferred embodiment of the process of the present invention, the thermal cracking conditions are: the furnace temperature is 600 ℃, the cracking time is 0.2min, and the interface temperature is 300 ℃.
The inventor researches and discovers that the plastic and the products thereof can be fully cracked by cracking at the furnace temperature of 600 ℃, the cracking time of 0.2min and the interface temperature of 300 ℃, and under the conditions, the requirement on the cracking temperature is low, the cracking time is short and the method efficiency is high.
As a preferred embodiment of the method of the present invention, the degradable plastic comprises PLA, PBAT, PBS, PCL, PBA, PBC, PPC, PHA and PGA.
In addition, the invention also provides an application of the method in distinguishing degradable plastics and products thereof from non-degradable plastics and products thereof.
As a preferred embodiment of the use according to the invention, the non-degradable plastics comprise PET, PP and PE.
Compared with the prior art, the invention has the beneficial effects that:
the method for discriminating the degradable plastics and the products thereof adopts thermal cracking and a corresponding gas chromatography-mass spectrometry method, can detect various degradable or non-degradable plastics and the products thereof under the same condition, and further analyzes characteristic peaks in a spectrogram to obtain whether the corresponding plastics and the products thereof are degradable or not; by adopting the technical scheme provided by the invention, all characteristic peaks indispensable to complete identification can be collected within 30 min; therefore, the method for screening the degradable plastics and the products thereof provided by the invention is simple, rapid, accurate and high in universality.
Drawings
FIG. 1 is a total ion flux chromatogram of polylactic acid PLA in example 1;
FIG. 2 is a total ion flow chromatogram of poly (terephthalic acid)/adipic acid/butylene terephthalate PBAT from example 2;
FIG. 3 is a total ion flow chromatogram of PBS (polybutylene succinate) in example 3;
FIG. 4 is a total ion current chromatogram of polycaprolactone PCL in example 4;
FIG. 5 is a total ion current chromatogram of polybutylene adipate PBA in example 5;
FIG. 6 is a total ion flow chromatogram of polybutadiene carbonate PBC in example 6;
FIG. 7 is a partial view of a total ion flow chromatogram of PPC of polypropylene carbonate in example 7;
FIG. 8 is a total ion flux chromatogram of PGA as polyglycolic acid in example 8;
FIG. 9 is a total ion current chromatogram of polypropylene PP from example 9;
FIG. 10 is a total ion current chromatogram of polyethylene PE in example 10;
FIG. 11 is a total ion flux chromatogram of polyethylene terephthalate PET in example 11;
FIG. 12 is a total ion flux chromatogram of polylactic acid PLA in comparative example 1;
fig. 13 is a total ion flux chromatogram of polylactic acid PLA in comparative example 2.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
In this example, the identification of polylactic acid PLA specifically includes the following steps:
taking 0.1mg of conventional PLA slices, setting the temperature of a thermal cracking furnace at 600 ℃, the cracking time at 0.2min and the interface temperature at 300 ℃, and analyzing by a gas chromatography-mass spectrometer after cracking; the specific parameters of the gas chromatography-mass spectrometer are as follows:
a chromatographic column: TG-5SilMS (30m 0.25mm 0.25um);
carrier gas and mode: helium and constant current;
column flow rate: 1.0mL/min;
temperature rising procedure: keeping at 50 deg.C for 2min, heating to 300 deg.C at 20 deg.C/min, and keeping for 10min;
sample inlet temperature: 300 ℃;
sample introduction mode: split-flow sample injection is carried out, and the split-flow ratio is 60;
transmission line temperature: 300 ℃;
ion source temperature: 300 ℃;
scanning mode: EI, full Scan (29-500 m/z);
the mass number scanning range is 35-500m/z;
the obtained map is shown in FIG. 1.
Example 2
In this example, poly (terephthalic acid)/adipic acid/butylene terephthalate (PBAT) is identified, and the only difference between this example and example 1 is the difference of the plastic, and the obtained map is shown in FIG. 2.
Example 3
In the present example, poly (butylene succinate) PBS is identified, and the only difference between the present example and example 1 is the difference of plastics, and the obtained map is shown in FIG. 3.
Example 4
In this example, polycaprolactone PCL was identified, and the only difference between this example and example 1 is the difference between plastics, and the obtained map is shown in fig. 4.
Example 5
In this example, PBA was identified, and the only difference between this example and example 1 is the difference in the plastic, and the obtained spectrum is shown in FIG. 5.
Example 6
The polybutadiene carbonate PBC was identified in this example, and the only difference between this example and example 1 is the difference in plastics, and the obtained map is shown in FIG. 6.
Example 7
This example identifies polypropylene carbonate PPC, and the only difference between this example and example 1 is the difference in plastics, and the resulting map is shown in fig. 7.
Example 8
Polyglycolic acid PGA was identified in this example, and the only difference between this example and example 1 is the difference in plastic, and the obtained map is shown in fig. 8.
Example 9
The polypropylene PP was identified in this example, and the only difference between this example and example 1 is the difference between the plastics, and the obtained map is shown in FIG. 9.
Example 10
The polyethylene PE was identified in this example, and the only difference between this example and example 1 is the difference between the plastics, and the obtained map is shown in FIG. 10.
Example 11
The example identifies polyethylene terephthalate PET, and the only difference between this example and example 1 is the difference between the plastics, and the obtained map is shown in FIG. 11.
Example 12
In this example, the identification of polylactic acid PLA specifically includes the following steps:
taking 0.1mg of conventional PLA slices, setting the temperature of a thermal cracking furnace at 500 ℃, the cracking time at 0.4min and the interface temperature at 300 ℃, and analyzing by a gas chromatography-mass spectrometer after cracking; the specific parameters of the gas chromatography-mass spectrometer are as follows:
and (3) chromatographic column: TG-5SilMS (30m 0.25mm 0.25um);
carrier gas and mode: helium gas and constant current;
column flow rate: 1.0mL/min;
temperature rising procedure: keeping at 50 deg.C for 2min, heating to 300 deg.C at 20 deg.C/min, and keeping for 10min;
sample inlet temperature: 300 ℃;
sample introduction mode: split-flow sample injection is carried out, and the split-flow ratio is 60;
transmission line temperature: 300 ℃;
ion source temperature: 300 ℃;
scanning mode: EI, full Scan (29-500 m/z);
the mass number scanning range is 35-500m/z.
Example 13
In this example, the identification of polylactic acid PLA specifically includes the following steps:
taking 0.1mg of conventional PLA slices, setting the temperature of a thermal cracking furnace at 600 ℃, the cracking time at 0.2min and the interface temperature at 300 ℃, and analyzing by a gas chromatograph-mass spectrometer after cracking; the specific parameters of the gas chromatography-mass spectrometer are as follows:
and (3) chromatographic column: TG-5SilMS (30m 0.25mm 0.25um);
carrier gas and mode: helium and constant current;
column flow rate: 1.5mL/min;
temperature rising procedure: keeping at 50 deg.C for 2min, heating to 300 deg.C at 15 deg.C/min, and keeping for 12min;
sample inlet temperature: 300 ℃;
sample introduction mode: split-flow sample injection is carried out, and the split-flow ratio is 60;
transmission line temperature: 305 ℃;
ion source temperature: 305 ℃;
scanning mode: EI, full Scan (29-500 m/z);
the mass number scanning range is 35-500m/z.
Example 14
In this example, the identification of polylactic acid PLA specifically includes the following steps:
taking 0.1mg of conventional PLA slices, setting the temperature of a thermal cracking furnace at 600 ℃, the cracking time at 0.2min and the interface temperature at 300 ℃, and analyzing by a gas chromatography-mass spectrometer after cracking; the specific parameters of the gas chromatography-mass spectrometer are as follows:
a chromatographic column: TG-5SilMS (30m 0.25mm 0.25um);
carrier gas and mode: helium and constant current;
column flow rate: 1.2mL/min;
temperature rising procedure: maintaining at 40 deg.C for 3min, heating to 290 deg.C at 25 deg.C/min, and maintaining for 8min;
sample inlet temperature: 320 ℃;
sample introduction mode: split-flow sample injection, wherein the split-flow ratio is 60;
transmission line temperature: 295 ℃;
ion source temperature: 295 ℃;
scanning mode: EI, full Scan (29-500 m/z);
the mass number scanning range is 35-500m/z.
Comparative example 1
The comparative example identifies polylactic acid (PLA), and specifically comprises the following steps:
taking 0.1mg of conventional PLA slices, setting the temperature of a thermal cracking furnace at 600 ℃, the cracking time at 0.2min and the interface temperature at 300 ℃, and analyzing by a gas chromatography-mass spectrometer after cracking; the specific parameters of the gas chromatography-mass spectrometer are as follows:
a chromatographic column: TG-5SilMS (30m 0.25mm 0.25um);
carrier gas and mode: helium and constant current;
column flow rate: 1.0mL/min;
temperature rising procedure: keeping at 50 deg.C for 2min, heating to 300 deg.C at 12 deg.C/min, and keeping for 10min;
sample inlet temperature: 300 ℃;
sample introduction mode: split-flow sample injection, wherein the split-flow ratio is 60;
transmission line temperature: 300 ℃;
ion source temperature: 300 ℃;
scanning mode: EI, full Scan (29-500 m/z);
the mass number scanning range is 35-500m/z;
the resulting map is shown in FIG. 12.
Comparative example 2
The comparative example identifies polylactic acid (PLA), and specifically comprises the following steps:
taking 0.1mg of conventional PLA slices, setting the temperature of a thermal cracking furnace to be 350 ℃, the cracking time to be 0.2min and the interface temperature to be 300 ℃, and analyzing by a gas chromatography-mass spectrometer after cracking; the specific gas chromatography-mass spectrometer parameters are as follows:
a chromatographic column: TG-5SilMS (30m 0.25mm 0.25um);
carrier gas and mode: helium and constant current;
column flow rate: 1.0mL/min;
temperature rising procedure: keeping at 50 deg.C for 2min, heating to 300 deg.C at 20 deg.C/min, and keeping for 10min;
sample inlet temperature: 300 ℃;
sample introduction mode: split-flow sample injection, wherein the split-flow ratio is 60;
transmission line temperature: 300 ℃;
ion source temperature: 300 ℃;
scanning mode: EI, full Scan (29-500 m/z);
the mass number scanning range is 35-500m/z;
the resulting map is shown in FIG. 13.
Examples of effects
FIGS. 1 to 11 obtained in examples 1 to 11 were analyzed, the graphs were labeled respectively, and the labels of characteristic peaks of the corresponding plastics were recorded in tables 1 to 11;
1. the PLA profile in example 1 was analyzed as follows:
TABLE 1
Figure BDA0003729110010000091
Figure BDA0003729110010000101
It can be seen from fig. 1 that the characteristic peak-off time is 8 minutes before.
2. PBAT mapping in example 2 was analyzed as follows:
TABLE 2
Figure BDA0003729110010000102
It can be seen in conjunction with fig. 2 that the characteristic peak-off time is before 14 minutes.
3. The PBS profile in example 3 was analyzed as follows:
TABLE 3
Figure BDA0003729110010000103
It can be seen in conjunction with fig. 3 that the characteristic peak-off time is before 10 minutes.
4. PCL mapping in example 4 was analyzed as follows:
TABLE 4
Figure BDA0003729110010000104
Figure BDA0003729110010000111
It can be seen in conjunction with fig. 4 that the characteristic peak-off time is 24 minutes ago.
5. The PBA mapping in example 5 was analyzed as follows:
TABLE 5
1, 3-butadiene 3-buten-1-ol Cyclopentanone Adipic acid 3-butenoic ester Dibutylene adipate
Marking C4 A CP B C
Characteristic ion fragment 39,53,54 39,42,72 41,55,84 55,111,129 111,129,183,
It can be seen in conjunction with fig. 5 that the characteristic peak-off time is before 12 minutes.
6. PBC mapping in example 6 was analyzed as follows:
TABLE 6
Carbon dioxide 1, 3-butadiene Tetrahydrofuran (THF) Butanediol Beta-butyrolactone
Marking CO2 A THF B C
Characteristic ion fragment 44 39,53,54 42,71,72 42,57,71 42,43
It can be seen in conjunction with fig. 6 that the characteristic peak-off time is 8 minutes ago.
7. The PPC profile of example 7 was analyzed as follows:
TABLE 7
Propylene (PA) Propylene oxide 3-buten-1-ol Propylene carbonate
Marking C3 A B C
Characteristic ion fragment 39,41,42 43,58 39,42,72 43,57,87
It can be seen in conjunction with fig. 7 that the characteristic peak-off time is 6 minutes ago.
8. The PGA mapping analysis in example 8 was as follows:
TABLE 8
Figure BDA0003729110010000112
Figure BDA0003729110010000121
It can be seen from fig. 8 that the characteristic peak-off time is 8 minutes before.
9. The PP profile in example 9 was analyzed as follows:
TABLE 9
Figure BDA0003729110010000122
It can be seen in conjunction with fig. 9 that the characteristic peak-off time is before 28 minutes.
10. The PE profile in example 10 was analyzed as follows:
watch 10
Figure BDA0003729110010000123
It can be seen from fig. 10 that the characteristic peak-off time is before 22 minutes.
11. The PET profile in example 11 was analyzed as follows:
TABLE 11
Figure BDA0003729110010000131
It can be seen from fig. 11 that the characteristic peak-off time is before 22 minutes.
As can be seen from examples 1 to 11 and fig. 1 to 11, the corresponding plastics obtained by the technical scheme of the present invention have peak discharge times within 30 minutes, mostly within 15 minutes, and as can be seen from the graphs, the peak shape is sharp, and the separation degree of the peak is good, so that it can be seen that the plastics can be rapidly, accurately, simply and conveniently distinguished by the method of the present invention;
the thermal cracking temperature and the parameters of the test were changed in example 1 and examples 12 to 14, but they were within the range given by the present invention, wherein the results obtained using the solutions of examples 12 to 14 were almost identical to the results of example 1.
As can be seen from example 1 and comparative examples 1 to 2 or from FIGS. 1 and 12 to 13, when the temperature for thermal cracking was lowered, a disordered pattern was obtained, and no useful peak was observed; when the temperature rise program in the gas phase condition is changed, the peak-out time of the obtained characteristic peak becomes long, reducing the efficiency of the identification method.
Finally, it should be noted that the above embodiments are intended to illustrate the technical solutions of the present invention and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (7)

1. A method for screening degradable plastics and products thereof, characterized in that the method comprises the following steps:
(1) Thermally cracking plastics and products thereof;
(2) Testing the thermal cracking product by a gas chromatography-mass spectrometer, and analyzing a chromatogram so as to finish the discrimination of the degradable plastic and the product thereof;
the test conditions in the gas chromatography-mass spectrometer test are as follows;
carrier gas and mode: helium gas and constant current;
column flow rate: 1-1.5mL/min;
temperature rising procedure: maintaining at 40-50 deg.C for 1-3min, heating to 290-300 deg.C at 15-25 deg.C/min, and maintaining for 8-12min;
sample inlet temperature: 300-320 ℃;
sample introduction mode: split-flow sample injection with a split-flow ratio of 100 (1-1.2);
transmission line temperature: 295 to 305 ℃;
ion source temperature: 295 to 305 ℃;
scanning mode: EI, full Scan (35-500 m/z).
2. The method of claim 1, wherein the test conditions in the gc-ms test are as follows;
column flow rate: 1.0mL/min;
temperature rising procedure: keeping at 50 deg.C for 2min, heating to 300 deg.C at 20 deg.C/min, and keeping for 10min;
sample inlet temperature: 300 ℃;
sample introduction mode: split-flow sample injection, wherein the split-flow ratio is 100;
transmission line temperature: 300 ℃;
ion source temperature: at 300 deg.c.
3. The method of claim 1, wherein the thermal cracking temperature is 500-650 ℃.
4. The method of claim 1, wherein the thermal cracking time is 0.1-0.4min.
5. The method of claim 1, wherein the thermal cracking conditions are: the test mode is that the furnace temperature is 600 ℃, the cracking time is 0.2min, and the interface temperature is 300 ℃.
6. The method of claim 1, wherein the degradable plastic comprises PLA, PBAT, PBS, PCL, PBA, PBC, PPC, PHA, and PGA.
7. Use of the method according to any one of claims 1 to 6 for distinguishing between degradable plastics and their products and non-degradable plastics and their products.
CN202210781578.XA 2022-07-04 2022-07-04 Method for discriminating degradable plastic and product thereof and application Pending CN115144499A (en)

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Citations (12)

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