本文選題：水煤漿　切入點(diǎn)：分散劑　出處：《陜西科技大學(xué)》2016年碩士論文

【摘要】：陜西彬長(zhǎng)煤和內(nèi)蒙霍林河煤的煤質(zhì)差,氧/碳比和內(nèi)水含量較高,變質(zhì)程度低,成漿性差。本文針這兩種煤,制備了新一代水煤漿分散劑,聚羧酸鹽水煤漿分散劑。該類分散劑分散性能優(yōu)異,制漿濃度高,添加量小、其制備工藝簡(jiǎn)單。但是由于各單體價(jià)格昂貴導(dǎo)致制備成本高,還未被廣泛應(yīng)用。制備出性能優(yōu)良,價(jià)格低廉的聚羧酸鹽分散劑是發(fā)展該類分散劑的關(guān)鍵。本文制備了一系列聚羧酸鹽分散劑,旨在降低合成成本,篩選出最經(jīng)濟(jì)有效的功能單體,提高聚羧酸鹽分散劑的應(yīng)用價(jià)值。本文的第一部分以甲基丙烯酸(MAA)和烯丙基磺酸鈉(SAS)為單體,以質(zhì)量分?jǐn)?shù)為10%的次亞磷酸鈉為鏈轉(zhuǎn)移劑,以4%(質(zhì)量分?jǐn)?shù))的過(guò)硫酸氨為引發(fā)劑,反應(yīng)溫度為80℃,反應(yīng)時(shí)間約為5h,通過(guò)自由基反應(yīng)共聚制得兩元聚羧酸鹽(PMAS)系列聚羧酸鹽分散劑。單體MAA:SAS的摩爾比分別為20.83,9.21,4.60,3.63,2.22的兩元分散劑,分別記為PMAS-0、 PMAS-1、PMAS-2、PMAS-3、PMAS-4。并通過(guò)水相電位滴定法測(cè)得-COO-1-SO3-1的實(shí)際摩爾比分別為15.67,6.93,3.23,1.78,0.94。并通過(guò)紅外光譜(FT-IR)、凝膠滲透色譜(GPC)表征了其分子結(jié)構(gòu)。將其作用于陜西彬長(zhǎng)煤制漿,在用量為0.4wt%,水煤漿漿濃為65%時(shí),考察了漿體的表觀粘度與-COO-1-SO3-1比值的關(guān)系,在不同濃度下的Zeta電位以及pH對(duì)水煤漿制漿應(yīng)用的影響等。結(jié)果表明當(dāng)-COO-1-SO3-1比值為約3.23時(shí),漿體的表觀粘度最低,穩(wěn)定性理想,此時(shí)漿體的Zeta能達(dá)到-38mV,水煤漿粘度隨著pH的增大逐漸降低,當(dāng)pH大于10時(shí)水煤漿粘度趨于穩(wěn)定。第二部分在二元分散劑的基礎(chǔ)上引入聚醚大單體,并改變磺酸鹽單體的種類,考察其應(yīng)用性能。用甲基丙烯酸(MAA)、烯丙基醇聚氧乙烯醚(APEG500)分別和苯乙烯磺酸鈉(SSS)、烯丙基磺酸鈉(SAS)、甲基烯丙基磺酸鈉(SMAS).2-丙烯酰胺-2-甲基丙磺酸(AMPS)按照一定比例,通過(guò)共聚反應(yīng)制得4種三元分散劑,分別記為PCSS、PCS、PCSM、 PCSA。通過(guò)紅外光譜(FT-IR)、凝膠滲透色譜(GPC)表征了結(jié)構(gòu)。以熱失重(TA)和差示掃描(DSC)分析,考察了其熱性能。將4種分散劑分別作用于霍林河煤制漿,分析了大單體APEG500的最佳用量。并考察了4種分散劑制漿時(shí)的表觀粘度、穩(wěn)定性、流變性、最大成漿濃度、最佳添加量等性能,篩選出性能最佳的磺酸鹽單體對(duì)應(yīng)的聚羧酸鹽分散劑。通過(guò)Zeta電位、吸附性能及其和煤的接觸角等作用機(jī)理,分析了幾種分散劑與煤的作用特點(diǎn)。結(jié)果表明,在MAA:S(磺酸鹽單體):APEG500=4:1.3:2時(shí),霍林河煤的最佳制漿濃度為57%,最佳添加量為0.4%。其中分散劑：PCSS的分散性能最好,制漿的表觀粘度和穩(wěn)定性俱佳,且PCSS的流變模型優(yōu)于其他三元分散劑制漿流變模型。分散齊PCSS在煤表面的吸附量最大,可達(dá)3.32mg/g,漿濃在57%時(shí),表觀粘度在644mPa·s, Zeta電位為-41mV,接觸角有34.11°。篩選出帶苯環(huán)的苯乙烯磺酸鈉是該三元分散劑的最佳磺酸鹽類單體。第三部分以甲基丙烯酸(MAA)、烯丙基醇聚氧乙烯醚(APEG500)、苯乙烯(St)分別和烯丙基磺酸鈉(SAS)、甲基烯丙基磺酸鈉(SMAS)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)共聚制得3種四元聚羧酸鹽分散劑。分別記為PCST、PCSMT、PCSAT。通過(guò)紅外光譜、熱重、凝膠滲透色譜等手段對(duì)分散劑的結(jié)構(gòu)、熱性能和相對(duì)分子質(zhì)量及其分布進(jìn)行了表征和分析。作用于霍林河煤,討論了St的最佳用量,考察了漿體的表觀粘度、穩(wěn)定性、流變性、最大成漿濃度、最佳添加量等性能。最后考察了分散劑的Zeta電位、吸附性能及其和煤的接觸角等作用機(jī)理。結(jié)果表明,在St用量為3.5Wt%時(shí),四元分散劑PCST的分散性能最好。此時(shí),霍林河煤的最佳制漿濃度為57%,最佳添加量為0.4%。其中分散劑PCST的分散性能最好,表觀粘度和穩(wěn)定性俱佳,流變模型為假塑型。分散齊IJPCST的的分散性能最好,漿濃在57%時(shí),表觀粘度在503.7 mPa·s,吸附量最大,可達(dá)3.19mg/g, Zeta電位為-36mV,接觸角有49.84°。
[Abstract]:Coal Shaanxi Binchang coal and Inner Mongolia Huolinhe Coal poor oxygen / carbon ratio and high water content, low degree of metamorphism, the pulp is poor. These two kinds of coal in this paper, the preparation of a new generation of water coal slurry dispersing agent, polycarboxylic acid salt water coal slurry dispersing agent. The dispersion agent with excellent performance the high concentration of the pulp, and add a small amount of the preparation process is simple. But because of the expensive monomer in the preparation of high cost, has not been widely used. The preparation of excellent performance, low price of polycarboxylate dispersant is the key to the development of dispersing agent. In this paper, the preparation of a series of polycarboxylate dispersant, in order to reduce the cost of synthesis, screening out the most economical and effective functional monomer, improve the application value of polycarboxylate dispersant. The first part of this paper using methacrylic acid (MAA) and sodium allyl sulfonate (SAS) as the monomer mass fraction of sodium hypophosphite as the chain 10% transfer agent, with 4% ( The mass fraction of) ammonium persulfate as the initiator, the reaction temperature is 80 DEG C, the reaction time is about 5h, prepared by the free radical reaction of 2 polycarboxylate (PMAS) series of polycarboxylate dispersant. The molar ratio of monomer MAA:SAS were 20.83,9.21,4.60,3.63,2.22 binary dispersant, respectively PMAS-0, PMAS-1. PMAS-2, PMAS-3, PMAS-4. and the actual molar ratio by an aqueous potentiometric titration of -COO-1-SO3-1 were measured by IR and 15.67,6.93,3.23,1.78,0.94. (FT-IR), gel permeation chromatography (GPC) to characterize the molecular structure. Its effect on Shaanxi Binchang coal slurry. When the dosage is 0.4wt%, the water coal slurry concentration is 65%. Explores the relationship between the apparent viscosity and the ratio of -COO-1-SO3-1 slurry table, under different concentrations of Zeta and the potential influence of pH on the preparation of coal water slurry application. The results show that when the -COO-1-SO3-1 ratio is about 3.23, paste table The lowest viscosity and stability of this ideal, paste Zeta can reach -38mV, coal water slurry viscosity gradually decreased with the increase of pH, when more than 10 pH coal water slurry viscosity tends to be stable. The second part is dispersed in two yuan agent is introduced based on the polyether macromonomer, and change the type of sulfonate monomer, the application performance. Using methacrylic acid (MAA), allyl alcohol polyoxyethylene ether (APEG500) and sodium styrene sulfonate (SSS), sodium allyl sulfonate (SAS), methyl allyl sulfonate (SMAS).2- acrylamide -2- methyl propane sulfonic acid (AMPS) according to a certain proportion, through the copolymerization reaction system 4 three Yuan dispersant, respectively PCSS, PCS, PCSM, PCSA. (FT-IR) by infrared spectroscopy, gel permeation chromatography (GPC) to characterize the structure. By thermogravimetry (TA) and differential scanning calorimetry (DSC) analysis, the thermal properties were investigated. The 4 kinds of dispersants were used to Huolinhe Coal Slurry. Analysis of the The optimal dosage of APEG500 monomer. And the effects of viscosity, 4 dispersant pulp surface stability, rheology, maximum slurry concentration, the optimal amount of performance, selected the best performance of the sulfonate monomer corresponding polycarboxylate dispersant. By Zeta potential, adsorption properties and coal and contact angle mechanism, analyzes several characteristics of dispersion agent and coal. The results showed that in MAA:S (sulfonate monomer): APEG500=4:1.3:2, the best concentration of pulp and Huolinhe Coal is 57%, the best dosage is 0.4%. the dispersant: PCSS dispersion can be the best, the apparent viscosity and good stability and table. And the PCSS rheological model is better than the other three yuan dispersant pulp rheological model. The maximum PCSS in homogeneous dispersion, adsorption of the coal surface can reach 3.32mg/g, pulp concentration is 57%, the apparent viscosity of 644mPa, s, Zeta potential is -41mV, the contact angle is 34.11 DEG. Screening With benzene sulfonic acid sodium is the three best dispersant sulfonate monomers. The third part of the methacrylic acid (MAA), allyl alcohol polyoxyethylene ether (APEG500), styrene (St) and sodium allyl sulfonate (SAS), methyl allyl sulfonate (SMAS), 2- -2- methyl acrylamide propane sulfonic acid (AMPS) prepared 3 yuan of four kinds of polycarboxylate dispersant. They were recorded as PCST, PCSMT, PCSAT. by infrared spectroscopy, thermogravimetry, gel permeation chromatography and other means of structure of dispersant, thermal properties and relative molecular mass and its distribution were characterized and analyzed. In Huolinhe Coal, discussion the optimal dosage of St, investigated the slurry apparent viscosity, stability, rheology, maximum slurry concentration, the optimal amount of performance. Finally we investigated the potential of Zeta dispersant, adsorption properties and the contact angle of coal and its mechanism. The results show that when the dosage of St is 3.5 Wt%, four yuan of dispersant PCST the best dispersant. At this time, the optimal pulping concentration Huolinhe Coal is 57%, the best dosage is 0.4%. the dispersion stability of disperse agent PCST best, apparent viscosity and stability and rheological model of pseudoplastic. Dispersion homogeneous IJPCST dispersion can be the best, in the pulp consistency 57%, the apparent viscosity at 503.7 mPa - s, the maximum adsorption amount, up to 3.19mg/g, the Zeta potential is -36mV, the contact angle is 49.84 degrees.

【學(xué)位授予單位】：陜西科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TQ536;O631
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本文編號(hào)：1660752