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Analysis method of random ethylene-propylene copolymer sequence structure distribution

An ethylene-propylene copolymer and analysis method technology, applied in the field of analysis, can solve the problems of no standardized test analysis method, time-consuming test technology, complicated operation, etc., and achieve the effects of shortening test time, easy operation, and simplifying calculation formulas

Pending Publication Date: 2022-05-13
PETROCHINA CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of the existing testing technology such as long time-consuming, complicated operation and no standardized testing analysis method, the present invention provides a normal temperature, simple and standardized analysis method and a simplified calculation formula of the sequence structure

Method used

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  • Analysis method of random ethylene-propylene copolymer sequence structure distribution
  • Analysis method of random ethylene-propylene copolymer sequence structure distribution
  • Analysis method of random ethylene-propylene copolymer sequence structure distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] (1) Sample processing: Weigh three parallel samples of 6.8, 7.2, and 8.0 mg, cut each sample into pieces with a particle size of less than 1 mm with a blade, and put them into three numbered NMR tubes with compressed air. Add 0.6ml of deuterated o-dichlorobenzene solvent, after swelling for 12 hours, heat and keep the temperature to 60°C to fully dissolve.

[0076] (2) Carry out room temperature nuclear magnetic resonance quantitative carbon spectrum experiment:

[0077] After the samples were placed at room temperature, Bruker 400M NMR spectrometer was used for 13 C-NMR quantitative test, the test time is 12h.

[0078] (3) Spectrogram analysis: the working frequency of the scanning magnetic field is 161.9MHz, the temperature of the probe is 298K, the acquisition pulse program is zgig30, the relaxation delay time is 10s; the accumulation times are 5000. Lock field, shimming, adjust gain, collect data, record attenuation signal, after the scan is over, perform Fourier ...

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Abstract

The invention relates to an analysis method for sequence structure distribution of a random ethylene-propylene copolymer. The analysis method comprises the following specific steps: (1) nuclear magnetic resonance quantitative carbon spectrum testing; (2) functional group type attribution; (3) integral interval division; and (4) deducing a calculation formula and calculating sequence distribution. The method for determining the sequence structure of the random ethylene propylene rubber is simple, convenient, safe and standard to operate, short in test time, capable of realizing stable operation of instruments, and suitable for screening the ethylene propylene rubber serving as a lubricating oil viscosity index improver.

Description

technical field [0001] The invention relates to an analysis method, in particular to a measurement and calculation method for inversion-gated decoupling carbon-nuclear magnetic resonance spectrum analysis of random ethylene-propylene copolymer mono- and ternary sequence structure distribution. Background technique [0002] Propylene monomers with asymmetric substituents (CH 2 =CHCH 3 ) and ethylene (CH 2 =CH 2 ) monomers are randomly bonded along the main chain to form a binary random ethylene-propylene copolymer. This random ethylene-propylene copolymer can adjust the viscosity-temperature performance of lubricating oil to obtain good low-temperature starting performance and maintain proper performance at high temperature. Viscosity multigrade engine oil. Generally, an ethylene-propylene copolymer with an ethylene content of about 50%-70% and a propylene content of about 30%-50% is selected as a viscosity index improver for lubricating oil. However, it is often encount...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08G01N1/28G16C20/20G16C20/70
CPCG01N24/08G01N1/286G16C20/20G16C20/70G01N2001/2873
Inventor 赵丹汤仲平李进安文杰汪利平刘佳束建华
Owner PETROCHINA CO LTD
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