本文選題：超支化聚合物 + 水泥助磨劑��； 參考：《濟(jì)南大學(xué)》2015年碩士論文

【摘要】：水泥粉磨過程中耗能高、能量利用率低,摻加少量助磨劑就可以起到提高粉磨效率,改善水泥顆粒級配,提高水泥性能的作用。本文針對小分子助磨劑應(yīng)用中的問題,以三乙醇胺作為核分子,合成了超支化型大分子水泥助磨劑,對其合成工藝、性能進(jìn)行了系統(tǒng)研究,旨在開發(fā)新型超支化水泥助磨劑應(yīng)用于水泥混凝土中,改善水泥性能和促進(jìn)水泥廠的節(jié)能減排。本文研究具體內(nèi)容和實驗結(jié)果如下:1.合成兩種不同類型AB2型增長單體,用三乙醇胺作核分子,通過酯交換和酯化反應(yīng)分別生成了超支化聚胺-酯(HPE)和超支化聚酰胺-酯(HPAE),通過控制核分子和AB2單體比例為1:3,1:9,1:21分別合成了第一代,第二代,第三代超支化聚合物。對合成的兩種超支化聚合物進(jìn)行傅立葉紅外分析、元素分析、羥值和熱失重測試,結(jié)果表明合成的產(chǎn)物與設(shè)計的超支化分子結(jié)構(gòu)相符,能應(yīng)用到助磨劑領(lǐng)域。2.通過粉磨后水泥細(xì)度測試結(jié)果,超支化型助磨劑最佳摻量:HPE-G1、HPE-G2和HPAE-G1的最佳摻量是0.020%,45μm篩余分別降低了47.5%、52.5%和49.4%;HPE-G3、HPAE-G2和HPAE-G3的最佳摻量是0.010%,45μm篩余分別降低了48.7%、50.0%和46.8%;HPAE-M最佳摻量是0.015%,45μm篩余降低了48.1%。在它們最佳摻量時,摻加超支化助磨劑的水泥樣品比三乙醇胺具有更高的比表面積,通過粒徑分布結(jié)果遴選了HPE-G2、HPAE-G2和HPAE-M三種超支化型水泥助磨劑,它們3-32μm顆粒含量分別達(dá)到了68.8%、67.9%和66.4%,其中HPE-G2和HPAE-G2休止角分別降低了32.7%,25.0%。3.測試助磨劑對P·I水泥水化影響,與空白相比,在最佳摻量時,HPE-G2的3d和28d抗壓強(qiáng)度增長率分別為18.1%和30.5%;HPAE-G2的3d和28d抗壓強(qiáng)度增長率分別為15.7%、28.0%;HPAE-M的3d、28d增長率分別為26.4%、29.9%。摻加超支化型助磨劑的水泥樣品與三乙醇胺相比,凝結(jié)時間更接近空白且水泥硬化漿體的化學(xué)結(jié)合水含量更高,3d時HPAE-M化學(xué)結(jié)合水含量最高為22.16%,28d時HPE-G2的化學(xué)結(jié)合水含量最高為23.32%。結(jié)合對水泥水化樣3d和28d的XRD圖譜和SEM照片分析,表明各超支化型助磨劑均能激發(fā)促進(jìn)早期C3A和后期C3S的水化,這與超支化型助磨劑能提高水泥力學(xué)性能一致。4.實驗室合成超支化型助磨劑與減水劑的適應(yīng)性很好,提高了助磨劑適用范圍,在助磨、增強(qiáng)方面表現(xiàn)優(yōu)異。5.對于超支化助磨劑助磨增強(qiáng)的機(jī)理,通過其與三乙醇胺對比,探討醇胺基團(tuán)在水泥粉磨和水化過程中的作用機(jī)理,分析認(rèn)為超支化型助磨劑具有多吸附位點,更易吸附在水泥顆粒表面,同時其空間位阻作用明顯,提高了水泥顆粒分散性能,從而提高了粉磨效率、促進(jìn)了水泥水化,起到了助磨增強(qiáng)作用。
[Abstract]:In the process of cement grinding, energy consumption is high and energy utilization ratio is low. Adding a small amount of grinding aids can improve grinding efficiency, improve cement particle gradation and improve cement performance. In this paper, the hyperbranched macromolecular cement grinding aids were synthesized by using triethanolamine as the nuclear molecule to solve the problems in the application of small molecular grinding aids. The synthesis process and properties of hyperbranched macromolecular cement grinding aids were systematically studied. The purpose of this paper is to develop a new type of hyperbranched cement grinding aids used in cement concrete to improve the performance of cement and to promote energy saving and emission reduction in cement plants. In this paper, the specific contents and experimental results are as follows: 1. Two kinds of AB2 growth monomers were synthesized, and triethanolamine was used as nuclear molecule. By transesterification and esterification, the hyperbranched polyamide-ester (HPE) and hyperbranched polyamide-ester (HPAEN) were obtained, respectively. The first generation, the second generation and the third generation of hyperbranched polymers were synthesized by controlling the ratio of nuclear molecules to AB2 monomer at 1: 3: 1: 9: 1: 21, respectively. Fourier transform infrared (FTIR), elemental analysis, hydroxyl value and thermogravimetric analysis were used to analyze the two kinds of hyperbranched polymers. The results showed that the synthesized products were consistent with the designed hyperbranched molecular structure and could be applied to the field of grinding aids. 2. Through the fineness test of cement after grinding, the optimum content of hyperbranched grinding aids was 0.020% HPE-G1HPE-G2 and HPAE-G1. The optimum addition of HPE-G3HPAE-G2 and HPAE-G3 was decreased by 47.52.5% and 49.4HPE-G3HPAE-G2 and HPAE-G3 respectively by 47.52.5% and 48.1mm respectively, and the optimum dosage of HPAE-M was 0.01545 渭 m and 48.15 渭 m respectively. The cement samples with hyperbranched grinding aids have higher specific surface area than triethanolamine when they are best added. HPE-G2HPAE-G2 and HPAE-M hyperbranched cement grinding aids are selected according to the results of particle size distribution. The contents of 3-32 渭 m particles reached 68.9% and 66.4%, respectively, in which the angle of repose of HPE-G2 and HPAE-G2 decreased 32.725% and 25.0%, respectively. The effect of grinding aids on the hydration of Pi cement was tested. Compared with the blank, the compressive strength growth rates of HPE-G2 at 3 d and 28 d were 18.1% and 30.5%, respectively, and the compressive strength growth rates of HPAE-G2 on 3 d and 28 d of HPAE-G2 were 15.7% and 28.0%, respectively, and the 3 d and 28 d growth rates of HPE-G2 were 26.449% and 26.429.9d, respectively. Compared with triethanolamine, the setting time of cement with hyperbranched grinding aids is closer to blank and the chemically bound water content of cement hardened paste is higher than that of triethanolamine. When the chemical binding water content of HPAE-M is 22.16 ~ 28 days, the chemical binding water content of HPE-G2 is 23.32%. Combined with the XRD and SEM analysis of cement hydration samples for 3D and 28d, it was shown that all hyperbranched grinding aids could stimulate the hydration of C 3A and C 3s in the early and late stages, which was consistent with that of hyperbranched grinding aids in improving the mechanical properties of cement. The laboratory synthesis of hyperbranched grinding aids and water reducing agents is very good adaptability, improve the scope of application of grinding aids, in the grinding, enhance the performance of excellent .5. Compared with triethanolamine, the mechanism of hyperbranched grinding aids in cement grinding and hydration is discussed. It is concluded that the hyperbranched grinding aids have multiple adsorption sites. It is easier to be adsorbed on the surface of cement particles, and its space steric resistance is obvious, which improves the dispersion performance of cement particles, thus improves the grinding efficiency, promotes the hydration of cement, and plays the role of grinding enhancement.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ172.463

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