Method for identifying structure and composition of non-rubber component in natural rubber through thermogravimetry-PGC (pyrolysis gas chromatography)-MS (mass spectrum)

A technology for pyrolysis gas chromatography and natural rubber, which is applied in the field of identification of molecular structure and composition, and can solve the problems of failing to fully reflect the actual composition of acetone solubles and the large influence of chromatographic peaks, achieving information integrity and timeliness sexually superior effect

Inactive Publication Date: 2017-12-29
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

Ma Lisheng used PyGC-MS to study the composition of acetone solubles in natural rubber at a temperature of 250 °C. Although the approximate composition distribution of the mixture was obtained, it was not accurate to the specific molecular structure of the substance, and the...

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  • Method for identifying structure and composition of non-rubber component in natural rubber through thermogravimetry-PGC (pyrolysis gas chromatography)-MS (mass spectrum)
  • Method for identifying structure and composition of non-rubber component in natural rubber through thermogravimetry-PGC (pyrolysis gas chromatography)-MS (mass spectrum)
  • Method for identifying structure and composition of non-rubber component in natural rubber through thermogravimetry-PGC (pyrolysis gas chromatography)-MS (mass spectrum)

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[0027] The specific implementation of the present invention will be further described below in conjunction with the examples and drawings, but the implementation of the present invention is not limited thereto.

[0028] 1. Use acetone to extract raw natural rubber for 72 hours, then rotary steam at 70°C for 10 minutes, and finally dry in an oven at 60°C for 10 hours to obtain concentrated acetone-soluble AS.

[0029] 2. Take 5 mg of acetone soluble matter AS, and conduct thermogravimetric analysis under a nitrogen atmosphere. The temperature range is 30°C to 600°C, and the heating rate is 20°C / min. The thermogravimetric curve of AS (WF-AS) is obtained, which shows obvious The two thermogravity steps of , such as figure 1 shown.

[0030]3. In view of the two obvious weight loss steps presented in the AS thermogravimetric curve, a two-step cracking method was further used to analyze the mixture. The JHI-07Hybrid Curie point cracker is directly connected to the inlet of the HP ...

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Abstract

The invention discloses a method for identifying a structure and composition of a non-rubber component in natural rubber through thermogravimetry-PGC (pyrolysis gas chromatography)-MS (mass spectrum). The method comprises the following steps: (1) concentrating and drying the non-rubber component obtained from the natural rubber; (2) making a thermogravimetry detection analysis on a sample obtained after drying; (3) analyzing the composition of the sample with a step-by-step cracking method according to a result of the thermogravimetry detection analysis, effectively separating a split product in each step by using a chromatographic column, obtaining corresponding molecular structure information of the split product by using mass spectrum search and primarily judging composition characteristics of substances in the original sample according to the strong and weak degree of signal peaks in a total ion chromatorgraphy. Through application of the method disclosed by the invention, the molecular structure and the composition of the non-rubber component in the natural rubber can be analyzed quickly and accurately, the basic application theory of the natural rubber is enriched, and the technical guidance is provided for perfection of planting, processing and quality evaluation systems of the natural rubber and product production.

Description

technical field [0001] The invention relates to the field of molecular structure and composition identification of non-glue components in natural rubber, in particular to a method for identifying the structure and composition of non-glue components in natural rubber by thermogravimetry-cracking gas chromatography-mass spectrometry. Background technique [0002] Natural rubber is obtained by coagulating the latex collected from Hevea brasiliensis. The natural rubber that people usually know is a mixture, including the rubber hydrocarbon and non-rubber hydrocarbon parts of polyisoprene. The non-rubber Hydrocarbons (non-rubber components) include proteins, phospholipids, acetone solubles, etc., accounting for about 5wt% to 8wt% of the total amount of natural rubber. [0003] For a long time, due to the limitations of different industries, the planting and raw rubber processing of natural rubber have been out of touch with the production and performance requirements of downstrea...

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Application Information

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IPC IPC(8): G01N30/02G01N5/00
CPCG01N30/02G01N5/00
Inventor 罗远芳许体文林静傅伟文贾志欣贾德民
Owner SOUTH CHINA UNIV OF TECH
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