Coating technology: evaluation of uncertainty of formaldehyde content measurement results in Waterborne Coatings

It is suggested that the measurement result of formaldehyde content in water-based coatings is a parameter related to the measurement result It represents the dispersion between the measured values reasonably assigned to it It quantitatively explains the quality of the measurement result and can find out the main factors of the quality of the measurement result 1 Purpose of measurement ① Acetylacetone spectrophotometry was used to determine the content of free formaldehyde in water-based interior wall coating (including water-based putty) Through the analysis and quantification of the uncertainty components affecting the measurement results, the evaluation method of the uncertainty of the measurement results of free formaldehyde content in water-based coating was given (2) in Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Coating home news: the measurement result of formaldehyde content in water-based coating is a parameter related to the measurement result It represents the dispersion between the measured values, which quantitatively explains the quality of the measurement result and can find out the main factors of the quality of the measurement result 1 Measurement objective ① the content of free formaldehyde in water-based interior wall coating (including water-based putty) was determined by acetylacetone spectrophotometry Through the analysis and quantification of the uncertainty components affecting the measurement results, the evaluation method of the uncertainty of the measurement results of free formaldehyde content in water-based interior wall coating was given ② When the measurement result is in a critical state, it is used to make a correct judgment on the measurement result ③ It is used to evaluate the quality of laboratory measurement comparison results 2 The scope of application is applicable to the uncertainty evaluation of the measurement results of free formaldehyde content in all kinds of water-based interior wall coatings (including water-based putty) tested according to Appendix C (normative appendix) free formaldehyde content test method in GB / T 18582-2008 limit of harmful substances in interior wall coatings for interior decoration materials 3 According to the evaluation and expression of measurement uncertainty (JJF1059-1999) GB / T 18582-2008 limit of harmful substances in interior wall coatings for interior decoration materials (GB / T 23993-2009) 4 uncertainty evaluation (1) principle, free formaldehyde in samples is evaporated by distillation In the buffer solution of acetic acid ammonium acetate with pH = 6, formaldehyde in the fraction reacts with acetylacetone under the condition of heating to form a stable yellow complex After cooling, the absorbance is measured at the wavelength of 412nm According to the standard working curve, the content of free formaldehyde in the sample was calculated ② Environmental conditions room temperature (23 ± 2) ℃; relative humidity (55 ± 5)%; normal atmospheric pressure ③ measurement procedure Figure 1 free formaldehyde content detection procedure ④ establish mathematical model necttype = "rect" O: extrusio NOK = "F" style = "margin top: 0px; margin right: 0px; margin bottom: 0px; margin left: 0px; padding top: 0px; padding right: 0px; padding bottom: 0px; Padding left: 0px; word wrap: break word; line height: 25px; "> where: ω - free formaldehyde content, unit: m g / kg; m - formaldehyde mass measured from standard working curve, unit: μ g; m ′ - sample mass, unit: G; F - dilution factor; figure 2 cause and effect diagram of uncertainty source of free formaldehyde content Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,