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Nuclear magnetic resonance spectrum analysis method of biodegradable plastic

A technology of biodegradable plastics and nuclear magnetic resonance spectroscopy, applied in the field of detection and analysis, can solve the problems of long time, unfavorable wide application, and inability to quantify, and achieve the effect of rapid detection

Pending Publication Date: 2021-05-11
海南省产品质量监督检验所
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Problems solved by technology

[0004] At present, the methods for determining the biodegradation of plastics mainly include: growth classification method, Petri dish quantitative method, clear area method, soil burial method, radioactive method, etc. 14 C tracer method, etc., but the above methods are all qualitative detection methods, cannot be quantified, and need a long time, which is not conducive to wide application

Method used

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  • Nuclear magnetic resonance spectrum analysis method of biodegradable plastic
  • Nuclear magnetic resonance spectrum analysis method of biodegradable plastic
  • Nuclear magnetic resonance spectrum analysis method of biodegradable plastic

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Experimental program
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Embodiment 1

[0061] Embodiment 1 Biodegradable Plastics Qualitative Analysis

[0062] 1 Preparation of samples

[0063] 1.1 Make the sample to be tested into a small piece smaller than 2mm×2mm for the test. It is more convenient for the experiment operation to crush the sample into powder.

[0064] 1.2 Weigh the prepared sample m S : 0.5g~2.0g, accurate to 0.001g, put all into the filter paper tube. Put the filter paper cylinder into the extraction cylinder of the Soxhlet extractor, connect it to the receiving bottle that has been dried to constant weight, add chloroform from the upper end of the condenser tube of the extractor to two-thirds of the volume of the bottle, and place it in a water bath. Heat at 80°C±2°C to continuously reflux the chloroform for extraction (6 times / h to 8 times / h), generally for 6h to 8h, the degradable plastic components can be completely extracted by chloroform, and the filter paper tube Only insoluble components in chloroform remained.

[0065] 1.3 Remov...

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Abstract

The invention belongs to the technical field of detection and analysis, and particularly discloses a nuclear magnetic resonance spectrum analysis method for biodegradable plastics, which comprises the following steps: S1, extracting the biodegradable plastics by trichloromethane to obtain an extraction solution; S2, evaporating the extraction solution to dryness to obtain an extract for later use; S3, adding deuterated chloroform into the extract in the step S2, and dissolving to obtain a solute; and S4, detecting the dissolved matter in the step S3 by a nuclear magnetic resonance spectrum. The method at least has one of the following beneficial effects: trichloromethane is adopted to separate and extract the biodegradable plastic product, a nuclear magnetic resonance (NMR) spectrum method is adopted to qualitatively and quantitatively analyze the extract, and 1, 2, 4, 5-tetrachlorobenzene is taken as a quantitative internal standard to calculate the content of the degradable polymer in the to-be-detected sample. Therefore, rapid detection of the degradable components in the biodegradable product is realized.

Description

technical field [0001] The application belongs to the technical field of detection and analysis, more specifically, it relates to a nuclear magnetic resonance spectrum analysis method of biodegradable plastics. Background technique [0002] Biodegradable plastics refer to a class of plastics that are degraded by the action of naturally occurring microorganisms such as bacteria, molds (fungi) and algae. The ideal biodegradable plastic is a polymer material with excellent performance, which can be completely decomposed by environmental microorganisms after being discarded, and finally inorganicized to become an integral part of the carbon cycle in nature. [0003] Due to its good degradability, biodegradable plastics are mainly used as food soft and hard packaging materials, which is also its largest application field at this stage. Its main target markets are plastic packaging films, agricultural films, disposable plastic bags and disposable plastic tableware, etc. Compared...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 赵宏亮黄艳吴毓炜毛海梅汤苗罗腾谭若冰
Owner 海南省产品质量监督检验所
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