We use cookies to give you the best experience and to help improve our website
Find out what cookies we use and how to disable them
Standards Development
This proposal describes a HPLC method for determining the average relative molecular mass of aliphatic alkyl trimethylammonium chloride.
Quaternary ammonium salt is an important cationic surfactant, which has a good adjustment effect and bactericidal effect, and is widely used in fabric softeners, disinfectants, shampoo and hair care products and other product formulations. aliphatic alkyltrimethylammonium chloride is the most basic and most commonly used quaternary ammonium salt surfactant, and the common products can be divided into cetyltrimethylammonium chloride and octadecylammonium chloride according to the different carbon chains of the main components, which are referred to as 1631 and 1831 in the industry.
When determining the cationic active ingredient content of aliphatic alkyltrimethylammonium chloride in surfactants or detergents, it is generally determined according to the two-phase titration method, which requires the average relative molecular weight of the active ingredient to be accurately quantified. The China light industry standard QB/T 1914-2013 stipulates that the average relative molecular weight of quaternary ammonium salt is determined by gas chromatography, and the quaternary ammonium salt is pyrolyzed in the vaporization chamber to generate aliphatic alkyl dimethylamine, and the average relative molecular weight of aliphatic alkyltrimethylammonium chloride is indirectly determined and calculated by the homolog distribution of aliphatic alkyl dimethylamine. The whole process adopts a program to heat up, and the operation is more cumbersome. To solve this problem, a high-performance liquid chromatography method was developed. This method is different from the indirect determination of gas chromatography in that the sample is injected directly, the sample is chromatographically separated under the set chromatographic conditions, and the average relative molecular weight of the sample is calculated by area normalization method according to the carbon chain distribution. The results of the HPLC method and the GC method described in QB/T 1914-2013 were statistically analyzed by F-test combined with t-test, and the results showed that there was no significant difference between the method and the gas chromatography.
In this proposal, the method is proposed to be developed as "Surface active agents—Determination of average relative molecular mass of aliphatic alkyltrimethylammonium chloride— PART 2: HPLC method".
You are now following this standard. Weekly digest emails will be sent to update you on the following activities:
You can manage your follow preferences from your Account. Please check your mailbox junk folder if you don't receive the weekly email.
You have successfully unsubscribed from weekly updates for this standard.
Comment on proposal
Required form fields are indicated by an asterisk (*) character.