納米重晶石的合成及表面改性
發(fā)布時間：2019-07-01 16:53
【摘要】：納米重晶石具有優(yōu)秀的理化特性。而在制備過程中,尺寸,粒度分布及分散性是主要的工藝參數(shù)。如何制備粒徑小、分散性好的硫酸鋇納米顆粒,是當(dāng)今研究的重點。本文通過混合溶劑法(醇、水等),絡(luò)合法(EDTA等)進(jìn)行制備硫酸鋇顆粒,通過多種分析方法對不同反應(yīng)條件下樣品的形貌、分散性、粒徑分布及大小進(jìn)行了表征�；旌先軇┓ㄖ苽浼{米硫酸鋇的研究表明：反應(yīng)物濃度的增加,會導(dǎo)致產(chǎn)物粒徑變大,并伴有團(tuán)聚現(xiàn)象；乙醇含量對產(chǎn)物分散性、粒徑分布影響較大。EDTA絡(luò)合法制備硫酸鋇時研究不同反應(yīng)條件對產(chǎn)物的影響：反應(yīng)物濃度對產(chǎn)物的粒徑大小和分布都有較大影響,體系pH值在8.0時,產(chǎn)物形貌最好。石油鉆井泥漿的加重劑使用最多的是重晶石,但其表面能較大,易團(tuán)聚,懸浮性較差,對重晶石進(jìn)行表面改性,改變其等電點,增強(qiáng)其在鉆井液中的分散性和懸浮性。本文通過不同鏈長脂肪酸、硅酸鋇及二氧化硅對納米重晶石顆粒進(jìn)行改性,并通過XRD、TEM、FT-IR和粒徑分布等手段表征改性后的形貌、分散性等。不同鏈長脂肪酸包覆改性硫酸鋇顆粒時,活化指數(shù)和吸油量等表征手段都表明硫酸鋇顆粒表面有部分被改性,但整體改性效果不佳。硅酸鋇包覆硫酸鋇粒子時,攪拌速度太快會使剛包覆在硫酸鋇表面上的包覆膜脫落,pH值對包覆層結(jié)構(gòu)影響較大,直接影響離子的存在形式,pH值在10.0時,會形成明顯的核殼結(jié)構(gòu)。二氧化硅改性硫酸鋇,pH值在9.8-10.0時,硫酸鋇顆粒表面形成一層致密包覆膜,加入水玻璃體積過少會引起包覆層膜太薄,水玻璃體積為40 mL時,具有良好的包覆效果,分散性也較好。
[Abstract]:The nano barite has excellent physical and chemical properties. In the preparation process, the size, particle size distribution and dispersivity are the main process parameters. How to prepare the nano-particles with small particle size and good dispersibility is the focus of the present study. The morphology, dispersion, particle size distribution and size of samples under different reaction conditions were characterized by a mixed solvent method (alcohol, water, etc.), complexing method (EDTA, etc.). The results of the preparation of the nano-sulfuric acid by the mixed solvent method show that the concentration of the reactants is increased, and the particle size of the product is increased, and the agglomeration phenomenon is accompanied; the content of the ethanol has great influence on the dispersion and the particle size distribution of the product. The effect of different reaction conditions on the product is studied by EDTA-complexing method. The concentration of reactants has a great influence on the particle size and distribution of the product, and the pH value of the system is at 8.0, and the product has the best appearance. The weighting agent for petroleum drilling mud uses the most barite, but its surface can be large, easy to agglomerate, poor in suspension property, the barite is surface modified, its isoelectric point is changed, and its dispersibility and suspension in the drilling fluid are enhanced. The nano barite particles were modified by different chain length fatty acids, silicic acid and silica, and the morphology and dispersivity of the modified barite were characterized by XRD, TEM, FT-IR and particle size distribution. The activation index and the oil absorption and other characterization means indicate that the surface of the sulfate particles is partially modified, but the overall modification effect is not good. When the silicic acid is coated with the sulfate particles, the stirring speed is too fast, so that the coating film just coated on the surface of the sulfuric acid is dropped off, the pH value is greatly influenced by the structure of the coating layer, the existence form of the ions is directly affected, and when the pH value is 10.0, the obvious core-shell structure is formed. When the pH value of the silicon dioxide modified sulfuric acid solution is 9.8-10.0, a layer of dense coating film is formed on the surface of the surface of the sodium sulfate particles, the volume of the water glass is too small to cause the coating film to be too thin, and when the volume of the water glass is 40 mL, the silicon dioxide modified sulfuric acid solution has good coating effect and good dispersibility.
【學(xué)位授予單位】：上海應(yīng)用技術(shù)學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.1
本文編號：2508644
[Abstract]:The nano barite has excellent physical and chemical properties. In the preparation process, the size, particle size distribution and dispersivity are the main process parameters. How to prepare the nano-particles with small particle size and good dispersibility is the focus of the present study. The morphology, dispersion, particle size distribution and size of samples under different reaction conditions were characterized by a mixed solvent method (alcohol, water, etc.), complexing method (EDTA, etc.). The results of the preparation of the nano-sulfuric acid by the mixed solvent method show that the concentration of the reactants is increased, and the particle size of the product is increased, and the agglomeration phenomenon is accompanied; the content of the ethanol has great influence on the dispersion and the particle size distribution of the product. The effect of different reaction conditions on the product is studied by EDTA-complexing method. The concentration of reactants has a great influence on the particle size and distribution of the product, and the pH value of the system is at 8.0, and the product has the best appearance. The weighting agent for petroleum drilling mud uses the most barite, but its surface can be large, easy to agglomerate, poor in suspension property, the barite is surface modified, its isoelectric point is changed, and its dispersibility and suspension in the drilling fluid are enhanced. The nano barite particles were modified by different chain length fatty acids, silicic acid and silica, and the morphology and dispersivity of the modified barite were characterized by XRD, TEM, FT-IR and particle size distribution. The activation index and the oil absorption and other characterization means indicate that the surface of the sulfate particles is partially modified, but the overall modification effect is not good. When the silicic acid is coated with the sulfate particles, the stirring speed is too fast, so that the coating film just coated on the surface of the sulfuric acid is dropped off, the pH value is greatly influenced by the structure of the coating layer, the existence form of the ions is directly affected, and when the pH value is 10.0, the obvious core-shell structure is formed. When the pH value of the silicon dioxide modified sulfuric acid solution is 9.8-10.0, a layer of dense coating film is formed on the surface of the surface of the sodium sulfate particles, the volume of the water glass is too small to cause the coating film to be too thin, and when the volume of the water glass is 40 mL, the silicon dioxide modified sulfuric acid solution has good coating effect and good dispersibility.
【學(xué)位授予單位】：上海應(yīng)用技術(shù)學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.1
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