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The Synthesis of Vinylacetate-Methyl Methacrylate-Butyl Acrylate Terpolymer and Application of Sand-Fixing and Dust

Author: LiangXinJing
Tutor: ZhangLiDan
School: Beijing University of Chemical Technology
Course: Chemistry
Keywords: Emulsion Polymerization Dust suppressants Vinyl acetate Methyl methacrylate Butyl acrylate
CLC: X513
Type: Master's thesis
Year: 2010
Downloads: 144
Quote: 3
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Abstract


This thesis uses the seed emulsion polymerization method, the study was prepared by the vinyl acetate (referred to as VAC), methyl methacrylate (MMA), butyl acrylate (referred to as BA) copolymer emulsion, the emulsion is a water soluble good sand fixation dust suppressants. The dust suppressants can be used to inhibit the mines, docks, construction site dust flying, also combined with vegetation sand fixation for dust control. The subject of research on environmental protection and pollution control has a very important significance. Studied the optimization of of dust suppressants synthetic method and process conditions, the mass ratio of the three monomers, the amount of protective colloid, caused by factors such as the dosage of the compound amount of emulsifier and within than the performance of dust suppressants. Experimental results show that: vinyl acetate: methyl methacrylate: acrylic acid Dioxide three monomers mass ratio of 16:8:6, and the protective colloids used in an amount of 3.5% of the total monomers, the initiator over ammonium sulfate of monomer 0.8%, of the total mass of the the composite emulsifier (anionic: nonionic = 1:2) accounted for 3% of the total mass of the monomers, is the preferred process conditions. Obtained water-soluble sand fixing agent the viscosity can meet the requirements of the sand-fixation dust suppression and better dust suppression effects. The papers were used to characterize the physical and chemical properties of the of sand fixation dust suppression agent. Viscosity testing, Determination of solid content, surface tension measurement, infrared spectroscopy, differential thermal analysis and scanning electron microscope analysis. The study results show that: of dust suppressants viscosity at different temperatures, different storage time little change in surface tension experiment showed that dust suppression agent is added to the water, the surface tension decreased, infrared spectral characterization of the product characteristics of groups, differential thermal analysis showed dust suppressants from room temperature to 210 ℃ good thermal stability, and the transmissive scanning electron microscopy characterization placed in different time the dust suppressants dilute emulsion latex particles morphology, the dust suppressants have good water solubility; scanning electron microscopy (SEM) characterization of a sand-like surface appearance of the consolidation layer, to form a link between the dust suppressants sand, to meet the requirements of the sand fixation dust suppression application. The papers carried this the sand fixation dust suppressants application performance testing, water retention, water resistant to erosion, anti-wind erosion, frost temperature resistance and permeability were studied. The results show that: the water retention capacity of the sand mold sprayed with different solid content of dust suppressants, consolidation layer of sand surface water erosion, wind erosion resistance of good sand mold a certain degree of strength, and in severe cold and high temperature climate still showed good performance under the conditions, the dust suppressants has good sand fixation application performance can be seen from the experimental results. Sand fixation dust suppressants developed in this paper is a versatile polymer materials, wind and sand control dust suppression and able to meet the requirements of the dust-sand-fixation, and in accordance with the requirements of environmentally friendly, has a broad application prospects.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control > Particulate pollutants
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