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Quick determination method of structural composition of polypropylene glycol ethylene oxide adduct

A rapid determination technology of polypropylene glycol ethylene oxide, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of complex operation procedures, large test errors, high sensitivity and resolution of nuclear magnetic resonance, and achieve simple establishment and detection process, The effect of low equipment investment cost and rapid analysis

Inactive Publication Date: 2014-03-26
QUAKER CHEM CHINA
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Problems solved by technology

[0010] The above-mentioned methods are complicated in operation procedures, cannot meet the requirements of rapid analysis, and are difficult to popularize in industrial production
High-performance liquid chromatography is not often used due to poor resolution performance and large test errors
The sensitivity and resolution of nuclear magnetic resonance are high. Using nuclear magnetic resonance to study the structure and composition of polyoxyethylene and polyoxypropylene can accurately and quantitatively analyze the content of ethylene oxide in copolymers. However, due to the expensive nuclear magnetic resonance instruments, the operation of analytical instruments is complicated, and the analysis cycle Long, not suitable for the requirements of large-scale industrial production

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  • Quick determination method of structural composition of polypropylene glycol ethylene oxide adduct

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with examples.

[0022] 1. Test equipment:

[0023] American Thermo Fisher iS10 Fourier Transform Infrared Spectrometer

[0024] Resolution 4.0cm -1

[0025] Number of scans: 32 times

[0026] 2. Test conditions:

[0027] Test environment temperature: 25±5℃

[0028] Test environment humidity: RH≤60%

[0029] 3. Test steps:

[0030] 1) Before the test, check whether the temperature and humidity of the test environment meet the requirements, and operate under the specified temperature and humidity.

[0031] 2) After the FTIR infrared spectrometer is turned on, check whether the resolution and energy of the instrument meet the standards.

[0032] 3) At 4000cm -1 to 600cm -1 Air was used as the background for background scanning.

[0033] 4) Evenly coat the sample of the copolymer to be tested on the ATR crystal of the Fourier transform infrared spectrometer, and measure the transmittance infrar...

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Abstract

The invention discloses a quick determination method of structural composition of a polypropylene glycol ethylene oxide adduct. The method comprises the steps of determining infrared absorbance spectrum of a sample to be determined, based on a wave trough position within the wavelength interval of 1450-1400cm<-1>, reading peak heights of wave peaks within the wavelength intervals of 1380-1370cm<-1> and 1350-1340cm<-1> relative to the baseline, recording as X1 and X2, calculating to obtain a peak height ratio X2 / X1, determining standard samples with different ethylene oxide mass percentage contents, and establishing a standard working curve, and calculating to obtain an ethylene oxide mass percentage content by bringing X2 / X1 of the sample to be determined into the standard working curve. Compared with the traditional determination method, the method employs the fourier infrared spectrum, the equipment input cost is low, an establishment and detection process of the method is simpler, the requirement on an operator is lower, the ethylene oxide mass percentage content information can be obtained within 3-5min, the requirement of rapid analysis is met, and the method is easy to popularize in the industrial production.

Description

technical field [0001] The invention relates to a rapid determination method for the structure and composition of polypropylene glycol ethylene oxide adducts. Background technique [0002] The ethylene oxide adduct of polypropylene glycol (polyether type nonionic surfactant) is produced by addition polymerization of propylene oxide to polypropylene glycol, which is a compound with a relative molecular mass of 1000-15000. Due to the steric barrier of the methyl group in the molecule, its water solubility is very small and it is suitable as a lipophilic raw material for surfactants. When polypropylene glycol is added to ethylene oxide or copolymerized with ethylene oxide and propylene oxide, it forms a copolymer polymer surfactant embedded with polyoxyethylene and polyoxypropylene. This type of product is called polyether non-toxic Ionic surfactants, the general formula is RO(C 3 h 6 0) m (C 2 h 4 O) nH. [0003] Polyether-type nonionic surfactants have the ability to re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35
Inventor 谭芳李果莉孙杰
Owner QUAKER CHEM CHINA
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