Coating and adhesive testing

This standard specifies the use of high-performance liquid chromatography to determine the content of alkylphenol polyoxyethylene ether in water-based coatings. This standard is applicable to the determination of alkylphenol polyoxyethylene ether and alkylphenol in water-based coatings. The raw materials used for water-based coatings can also be executed according to this method. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 3186 Sampling of Raw Materials for Paints, Varnishes, and Varnishes GB/T6682-2008 Specification and Test Methods for Analytical Laboratory Water 3 Terms and Definitions The following terms and definitions apply to this document. 3.1 Alkylphenols (AP) Alkylphenols The molecular structure of alkyl phenols is R-C. H. - OH. This type of substance is commonly found in octylphenol (C, Hr-C. H-OH, abbreviated as OP) and nonylphenol (C, H-C.H-OH, abbreviated as NP). The molecular structure of alkyl phenol polyoxylates (APEO) is R-C. H - (OCH). OH; N-2-16,17-34,35-45. This type of substance is commonly found in octylphenol polyoxyethylene ether [CH, - CH, - (OC, H). OH, abbreviated as OP, EO] and nonylphenol polyoxyethylene ether [C. H: s-CHs - (OC: H.). OH, abbreviated as NP. EO]. Note that alkylphenol polyoxyethylene ether can be used as a surfactant in water-based coatings. Alkylphenol is a degradation product of alkylphenol polyoxyethylene ether. 4. Methanol and water are used as extraction solvents, and APEO is extracted from the sample using a combination of centrifugation and Soxhlet extraction. After the extraction liquid is concentrated, it is detected using high-performance liquid chromatography or current effective methods that can meet the accuracy requirements (such as liquid chromatography mass spectrometry, liquid chromatography tandem mass spectrometry, etc.). A determination method combining the determination of average ethoxy addition number of APEO using normal phase liquid chromatography and the determination of APEO content using reverse phase liquid chromatography, with external standard method for quantification. Note. The APEO in the sample can also be extracted using other confirmed extraction methods with similar recovery rates, such as high-speed centrifugal separation, ultrasonic extraction, etc