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Detection method of bio-based degradable material polybutylene adipate/terephthalate
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A technology of butylene terephthalate and polyadipic acid, which is applied in the field of analysis and detection, can solve problems such as inability to quantify, and achieve the effect of simple operation and accurate results
Active Publication Date: 2022-05-27
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Problems solved by technology
[0006] However, the inventors found that: the current pyrolysis GC-MS technology uses solid sample injection, which can only qualitatively determine polymers such as PBAT, but cannot quantify
Method used
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Embodiment 1
[0036] Example 1: Quantitative / qualitative detection of samples
[0037] The present invention adopts a production enterprise to provide 4 types of biodegradable plastic products containing PBAT, namely: I, biodegradable plastic film, II biodegradable lunch box, II biodegradable shopping bag, IV biodegradable express packaging film, respectively representing the most widely used and most widely used For the representative degradable materials, 3 batches of samples were selected for each type, and the specific information is shown in Table 1 below.
[0038] Table 1 Experimental sample information
[0039]
[0040] 1) Preparation of PBAT standard solution
[0041]Since PBAT has good solubility in dichloromethane solvent, the present invention adopts dichloromethane as solvent to prepare PBAT standard solution (1000mg / L), respectively draws 0, 0.1, 1, and 10 mL of standard mother liquor into a 100 mL volumetric flask, and uses two After the volume of methyl chloride was dete...
Embodiment 2
[0056] Example 2: Accuracy and precision experiments of the method
[0057] The preparation and testing method of the test solution are the same as those in Example 1.
[0058] The blank simulated solution (dichloromethane solution) was spiked to test the recovery rate and relative standard deviation. The method recovery rate and precision test results are shown in Table 5.
[0059] Table 5 Accuracy and precision experiments
[0060]
Embodiment 3
[0061] Example 3: Comparison of thermal cracking GC-MS technology and nuclear magnetic resonance (hydrogen spectroscopy) method
[0062] The preparation and testing method of the test solution are the same as those in Example 1.
[0063] In order to verify the reliability of the method, the present invention adopts nuclear magnetic resonance method and pyrolysis gas chromatography-mass spectrometry technology to select a certain biodegradable shopping bag (marked as PBAT+CaCO2). 3 ) 3 batches of products were tested, and the results are shown in Table 6. From the test results, it can be seen that the relative deviation of the two test methods at the 20% level of PBAT content is within 10%.
[0064] Table 6 Comparison of results of different test methods
[0065]
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Abstract
The invention belongs to the field of analysis and detection, and relates to a detection method of bio-based degradation material polybutylene adipate / terephthalate, which adopts thermal cracking gas chromatography method to analyze polybutylene adipate / terephthalate ( PBAT) for qualitative and / or quantitative analysis. The method provided by the invention can qualitatively and quantitatively detect the content of PBAT in degradable plastic products, without complicated, harsh and time-consuming pretreatment process. The method of the invention is simple, fast and accurate, and is suitable for qualitative and quantitative rapid screening and detection of the cracked components of the degradable material PBAT. The detection method is simple and easy to operate, and the result is accurate.
Description
technical field [0001] The invention belongs to the field of analysis and detection, and in particular relates to a rapid detection method of a bio-based degradable material polyadipate / butylene terephthalate (PBAT). Background technique [0002] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] Polybutylene adipate / terephthalate (PBAT) is a thermoplastic biodegradable plastic, which is a copolymer of butylene adipate and butylene terephthalate. It has both the characteristics of PBA and PBT. It not only has good ductility and elongation at break, but also has good heat resistance and impact performance; in addition, it also has excellent biodegradability, which is very active in the research of biodeg...
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