本文關(guān)鍵詞： 二氧化硅 硅灰石 復(fù)合顆粒 微觀形態(tài) 復(fù)合機(jī)理　出處：《遼寧科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：顆粒的復(fù)合化是構(gòu)建新物質(zhì)的重要途徑,還可以通過顆粒復(fù)合來(lái)促進(jìn)顆粒功能化,制備出的新物質(zhì)可以改變單一顆粒的表面性質(zhì),提高顆粒的分散性、流動(dòng)性等性能。二氧化硅具有優(yōu)異的物理化學(xué)性能,在塑料、橡膠等工業(yè)領(lǐng)域上有廣泛的應(yīng)用范圍。將無(wú)定型二氧化硅顆粒或膜包覆在硅灰石表面制備出二者的復(fù)合顆粒,即可發(fā)揮二氧化硅顆粒的補(bǔ)強(qiáng)功能,又可消除硅灰石顆粒的棱角、導(dǎo)致其表面粗糙,從而解決硅灰石與基體相容差等問題。本論文采用機(jī)械力化學(xué)法,通過二氧化硅顆粒的解聚分散、硅灰石的分散和二者濕法研磨方式復(fù)合等工序制備出二氧化硅/硅灰石復(fù)合顆粒,對(duì)制備過程中的影響因素進(jìn)行了考察和優(yōu)化,研究了制備復(fù)合顆粒材料的工藝和性能表征并對(duì)二氧化硅與硅灰石顆粒間的復(fù)合作用機(jī)理進(jìn)行了分析研究。試驗(yàn)采用單因素實(shí)驗(yàn)分別研究了二氧化硅與硅灰石在水介質(zhì)中的分散現(xiàn)象,優(yōu)化條件下實(shí)現(xiàn)了二氧化硅與硅灰石的分散。二氧化硅解聚分散的最佳優(yōu)化工藝參數(shù)為：球料比10：1、漿體濃度10%、研磨時(shí)間1.5h、分散劑用量10%,二氧化硅顆粒d50由18.434μm降為3.8μm,d90由44.17μm降為約8μm。對(duì)硅灰石分散的最佳優(yōu)化工藝參數(shù)為：機(jī)械攪拌時(shí)間40min,攪拌轉(zhuǎn)速600r/min,硅灰石顆粒d50從21.718μm下降至19.85μm,粗端粒徑d90也從86.592μm下降至83.65μm；研究了采用機(jī)械力化學(xué)法制備二氧化硅/硅灰石復(fù)合顆粒材料各主要工藝因素的影響。制備二氧化硅/硅灰石復(fù)合顆粒材料的優(yōu)化工藝為：二氧化硅與硅灰石比例為3：7,復(fù)合轉(zhuǎn)速1200r/min,反應(yīng)時(shí)間40min,球料比5：1,分散劑用量為6%；研究了二氧化硅/硅灰石復(fù)合顆粒材料的微觀形態(tài)及其復(fù)合作用機(jī)理。復(fù)合顆粒主要由二氧化硅顆粒團(tuán)聚體較均勻的包覆在硅灰石顆粒表面所形成,部分顆粒間存在著相互穿插。在二氧化硅/硅灰石復(fù)合顆粒上,二氧化硅與硅灰石之間通過各自表面羥基間的脫羥基作用實(shí)現(xiàn)具有化學(xué)性質(zhì)的結(jié)合。
[Abstract]:The composite of particles is an important way to construct new materials. It can also promote the functionalization of particles through particle compounding. The new materials can change the surface properties of single particles and improve the dispersion of particles. Fluidity and other properties. Silica has excellent physical and chemical properties in plastics. Rubber and other industrial fields have a wide range of applications. Amorphous silica particles or film coated on the surface of wollastonite to prepare the composite particles can play the role of the reinforcement of silica particles. It can also eliminate the edges of wollastonite particles, resulting in rough surface, so as to solve the problem of poor compatibility between wollastonite and matrix. In this paper, the mechanochemical method is used to depolymerize and disperse silica particles. Silica / wollastonite composite particles were prepared by the dispersion of wollastonite and the combination of the two wet grinding methods. The influencing factors in the preparation process were investigated and optimized. The preparation process and properties of composite granular materials were studied, and the mechanism of composite interaction between silica and wollastonite particles was analyzed. The single factor experiment was used to study the effect of silica and wollastonite on silica and wollastonite. Dispersion in water media. Under the optimized conditions, the dispersion of silica and wollastonite was realized. The optimum technological parameters of silica depolymerization and dispersion were as follows: ratio of ball to material 10: 1, slurry concentration 10: 1, grinding time 1.5 h. When the amount of dispersant was 10, the d50 of silica particles decreased from 18.434 渭 m to 3.8 渭 m. D90 was reduced from 44.17 渭 m to about 8 渭 m. The optimum technological parameters for wollastonite dispersion were as follows: mechanical stirring time 40 min, stirring speed 600 rpm. The d50 of wollastonite particles decreased from 21.718 渭 m to 19.85 渭 m, and the coarse end diameter d90 decreased from 86.592 渭 m to 83.65 渭 m. The influence of main technological factors on the preparation of silica / wollastonite composite granular material by mechanochemical method was studied. The optimized process of preparing silica / wollastonite composite granular material was as follows:. The ratio of silica to wollastonite is 3: 7. The compound speed is 1200 r / min, the reaction time is 40 min, the ratio of ball to material is 5: 1, and the amount of dispersant is 6. The microstructure and mechanism of silica / wollastonite composite particles were studied. The composite particles were mainly formed by the homogeneous coating of silica particles on the surface of wollastonite particles. On the silica / wollastonite composite particles, silica and wollastonite have chemical properties through the dehydroxylation of hydroxyl groups on the surface of the silica / wollastonite composite particles.
【學(xué)位授予單位】：遼寧科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ127.2;TB33

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本文編號(hào)：1479389