The Study On Improvement Of Commercial Coating And Its Anti-radon Performance

Objective:At present,the exposure of radon and its daughters is a serious public health problem.Anti-radon coating is a more effective method of radon prevention than ventilation,but there are not many varieties of anti-radon coatings on the market,which is expensive and the production process is complicated.Therefore,the aim of this work is to explore the effect of irradiation dose,silane couplig agent(KH550)concentration,water addition and stirring time on the anti-radon effect of coating based on the commercially available coatings.The improved anti-radon coatings were prepared,which were analyzed various properties.Methods:1.Common market topcoats were selected,including Nippon,Chenyang,Dulux,Skshu,Shewin-williams,the anti-radon effect of these five topcoats was measured by the RAD7 radon analyzer,and the best-effect coating was highlighted on demand.2.Single-factor experiment of gamma-ray irradiation dose was carried out to study the effect of different irradiation doses on best-effect coating.Single-factor experiments of water addition,silane couplig agent(KH550)concentration and stirring time were carried out,and the radon prevention effect of these factors was confirmed by means of DSC,FTIR,SEM.3.The best anti-radon coating formula was obtained by analyzing the results of single factor experiments,and conducting an orthogonal test of four factors and two levels with the interaction analysis.4.After a period of time,re-measure the anti-radon efficiency of the improved coating and evaluate its natural aging performance.Results:1.The optimal combination was verified through the single factor analysis,orthogonal experiment and the various characterization methods.The result showed that silane couplig agent(KH550)concentration was 0.3%,water addition was 10%and stirring time was 15min,the efficiency of radon protection was up to 81.4%when irradiation dose was 3kGy.2.FTIR test showed that some of the epoxy groups reacted with carboxyl groups sufficiently after irradiation.Silane coupling agent(KH550)was successfully linked to the topcoat.3.DSC test showed that the modified coating film had enhanced thermal stability,enhanced heat resistance,improved overall cross-linking effect.4.SEM showed that the porosity of the modified coating film was reduced and the block was increased.The film forming effect of the coating was obviously improved.5.In the case of natural aging,the anti-caries efficiency of the modified coating could still reach 80.5%within half one year,indicating that the coating had good aging resistance after modification.Conclusion:In this paper,the effects of irradiation treatment,addition of silane coupling agent(KH550),water addition and stirring time on the anti-radon efficiency were studied by single factor analysis and orthogonal experiment.The optimal combination formula was developed to develop anti-radon coating,which confirmed irradiation and silane coupling agent(KH550)can strengthen the cross-linking between the interfaces of building coatings,form a denser film,reduce porosity,improve the anti-radon efficiency of the film,and have a certain resistance to natural aging.