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

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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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 chromatogram had mixed peaks It has a great impact and fails to fully reflect the actual composition of acetone solubles (Ma Lisheng. Research on the extraction and separation of acetone solubles in natural rubber and its impact on rubber properties [D]. Hainan University, 2011.)

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