Research On The Anion Functional Finishing Method Of Dust Suppression Nets

In this paper,the dispersion effects of different dispersants were studied,and a variety of dispersants were combined to study the dispersion effects of anion powders.The effects of?-aminopropyl trimethoxysilane?KH-550?,polyvinyl acetate emulsion?PVAC?and polyethylene glycol?PEG200?on the dispersion efficiency were optimized using Design-Expert software with response surface methodology.The optimal technological conditions were obtained,with the concentration of KH-550 being 0.76 wt%,PEG being1.37 wt%and PVAC being 1.18 wt%.What's more,with the optimal technological conditions,the predicted dispersion efficiency would reach 50.9189%,which was very close to the real experimental value.Therefore,the model was reliable.Accordingly,scanning electron microscopy?SEM?,Infrared spectroscopy?FT-IR?,X-ray diffraction?XRD?,et al,were used to characterize the samples.The results showed that the anion powders were effectively dispersed,and the static anion release quantity of the anion powders increased after dispersion.The anion function finishing was performed on the polyester?PET?and polyethylene?PE?dust suppression nets under the same conditions with after-finishing method.The effects of dipping temperature,dipping time,drying temperature,et al,were investigated.After finishing,the highest dynamic anion release quantity of PET was 3200/cm³,and the maximum dynamic anion release quantity of PE was 2170/cm³.Obviously,the PET dust suppression nets shows better compatibility with anionic finishing agents.Moreover,the PET dust suppression nets were selected for further study.It was found that the after-finishing PET dust suppression nets?AnionPET?shows excellent washing performance,for its anion release performance can still be maintained at 2030/cm3 after30 times of washing.Furthermore,the anion powders were successfully attached on the surface of PET dust suppression nets by SEM,FT-IR and XRD,showing great finishing effect,without changing the main structure of PET.Monodisperse silica?SiO₂?microspheres were prepared by the St?ber sol-gel method,and the effects of ammonia's concentration,water's concentration,TEOS's concentration,drying environment,and reaction time on the morphology of SiO₂ were investigated.Meanwhile,the SiO₂/AnionPET were tested and analyzed.The XRD of the SiO₂ showed that the prepared SiO₂ was amorphous.The SEM images and FT-IR diagrams of the SiO₂/AnionPET showed that the SiO₂ microspheres were evenly distributed on the surface of PET fibers.Thermal gravimetric analysis?TG?showed that the thermal stability of PET fibers was enhanced after finishing,and the SiO₂ sol modification increased the moisture regain of the dust suppression nets to varying degrees.Furthermore,SiO₂/AnionPET exhibited stronger anion release capacity compared with Anion PET,and its anion release capacity decreased with the increase of particle size of SiO₂.In addition,the 120nm SiO₂sol-modified SiO₂/AnionPET had the best negative ion release ability and its anion release amount can reach to 3698/cm³.In summary,the anion after-finishing technology was applied to the dust suppression nets in this research.The organization structure of the dust suppression nets combined with the principle of negative ions doing Brownian motion in the air to eliminate ultra-fine dust particle,is expected to realize the comprehensive treatment of urban large particle dust and ultra-fine dust.The anion dust suppression nets exhibit great potential for their application in the field of environmental protection.