Preparation And Performance Study Of Environmentally Friendly Composite Dust Suppressan

The control of total suspended particulate matter（TSP）in the air has been a hot topic of research in urban air environment management.Studies have shown that dust is the main cause of urban air pollution,with dust generated from construction being the primary factor causing urban dust pollution.Therefore,effective control and management of dust emissions from construction sites is an important part of improving air quality.With the increasing emphasis on environmental protection at national and social levels,chemical dust suppression products are being researched to ensure that the effect of dust suppression is balanced with the impact on the environment.Therefore,it is necessary to develop an environmentally friendly composite and efficient dust suppression product.This thesis from the composite dust suppressant water retention agent,binder,surfactant and film-type enhancer perspective,through single,two-factor,orthogonal and other experiments to determine the best ratio of composite dust suppressant,and through a series of tests such as anti-evaporation,water resistance,wind corrosion resistance,degradation,etc.,to verify the composite dust suppressant comprehensive dust suppression performance and environmental adaptability.Firstly,through single-factor test,from sucrose,polyacrylic acid（PAA）and ethylene glycol（PG）,the polyacrylic acid with better water retention effect was selected as the raw material of water retention agent for environment-friendly compound dust suppressant;on the basis of solubility pre-experiment,the maximum ratio of viscosity value under different ratio of guar gum and xanthan gum（XG）was sought through two-factor test.The surfactant was selected as the surfactant raw material for the developed environmentally friendly dust suppressant by combining existing research on surfactants,referring to relevant literature at home and abroad,and making a horizontal comparison with similar products（sodium dodecyl sulfate SDS,sodium dodecyl sulfate SLS）from the molecular point of view.Through orthogonal experiments,the distribution formula of each group of dust suppressant was determined and verified by using intuitive analysis and extreme difference analysis.In order to enhance the mechanical properties of the solidified surface layer formed after dust suppressant spraying,the water content and hardness value were tested as indicators,and hydroxypropyl methylcellulose（HPMC）was selected as a film-type reinforcing agent added to the dust suppressant formulation.By field emission scanning electron microscopy（SEM）observation of dust suppressant spraying microscopic solidification layer surface morphology,the results show that:the developed dust suppressant in the spraying of the formation of solidification layer flat and smooth,dust particles are closely connected between the inter-particle gap filled by the dust suppressant.Comprehensive dust suppression test results show that:in the anti-evaporation test,the developed dust suppressant shows good cohesion effect,no cracking phenomenon after spraying solid layer,with continuous dust suppression effect;wind erosion resistance test,in the wind speed of7m/s experimental conditions,48h mass loss rate can still be maintained at a low level,in the expanded experiment,indoor PM_2.5,PM₁₀ concentration is still maintained in the standard range;after two water resistance experiments,the sample surface solidification layer still exists,no obvious loose particles on the surface,it is noteworthy that the test sample appeared small plant seedlings after spraying the second drying,from the side to verify the environmental friendliness of the developed dust suppressant;with good compressive strength and permeability;in the 5th cycle,more than half of the solidification layer has been degraded.In summary,the environmental friendly dust suppressant developed in this paper has good comprehensive dust suppression performance,in line with the concept of ecological protection,is a more ideal dust suppression material..Through the analysis of the dust suppressant components of the molecular structure of the material,from a microscopic point of view to explain the dust suppressant components of the mechanism of action,through the Materials studio to establish the corresponding structural model,and as a basis for the establishment of dust suppressant structure molecular model;dust suppressant aqueous solution in the spraying process by the influence of factors to explain the dust suppressant solution in the dust particles between the law of motion,to explain the dust suppressant after spraying and dust particles between the mechanism of action.