Method for performing lossless identification on brands of steel structure fireproof paints by applying near infrared spectroscopy

Abstract

The invention relates to a method for performing lossless identification on brands of steel structure fireproof paints by applying near infrared spectroscopy. The method comprises the following steps: adopting different brands of steel structure fireproof paint samples, collecting near infrared spectrums for several times at different positions on the surfaces of the coated steel structure fireproof paints by utilizing near infrared spectrum equipment, after spectrum pretreatment, establishing different brands of mahalanobis distance discriminant analysis models, calculating the mahalanobis distance average value and the mahalanobis distance critical value of each brand through comparing the validation set of different brands with the mahalanobis distance discriminant analysis models, collecting the near infrared spectrums of unknown samples to be contrasted with the established model of each brand, comparing the calculated minimum mahalanobis distance value of the unknown samples with the mahalanobis distance critical values of the brands, and judging the brands of the unknown samples. The method has the technical effects that the result is accurate, the operation is simple and convenient, the analysis is quick and the analysis cost is low, no pollution is caused to the environment, and the method is suitable for quick on-site lossless detection and identification for the quality and brands of the steel structure fireproof paints.

Description

technical field [0001] The invention relates to quality detection of fireproof coatings for steel structures, in particular to a method for non-destructively identifying brands of fireproof coatings for steel structures using near-infrared spectrum technology. Background technique [0002] Steel structure fire retardant coating is a special coating widely used on the surface of steel structure, which can retard the rapid spread of fire and improve the fire resistance limit of steel structure materials. At present, the technical performance test of fireproof coatings for steel structures is carried out in accordance with GB14907-2002 "Fireproof Coatings for Steel Structures". It is necessary to coat fireproof coatings on test specimens, dry and cure in natural environments, and conduct tests on specific experimental devices or test furnaces. This kind of test has a long detection period, complicated process and high test cost, and only a few professional institutions can carr...

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Problems solved by technology

Deng Xiaobo and others published the article "Research Status, Application, Development Direction and Research on Fireproof Performance Testing Methods of Fireproof Coatings for Steel Structures", which introduced in detail the cone calorimeter method, photoelectron spectroscopy, scanning electron microscopy, infrared spectroscopy, etc. Application methods for detecting fireproof coatings for steel structures, but the detection equipment of these methods is large in size and the detection time is long, so it is not suitable for rapid detection on site

In the paper "Research on Rapid Detection Technology of Fireproof Materials and Fire Extinguishing Agents" published by Hu Aiqin, a SIMCA identification model for steel structure fireproof coatings and ordinary coatings was established by using near-infrared spectroscopy technology. The established model can only be used to distinguish steel structure fireproof coatings from ordinary For coatings, the coating of fire-resistant coatings was not carried out according to the method of GB14907-2002 "Steel Structure Fire-proof Coatings", and the spectral range was not optimized, and no specific on-site judgment method and judgment basis were given.

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