一种含有超支化结构的新型水泥助磨剂的合成及其应用研究

发布时间：2018-05-27 08:14

本文选题：超支化聚合物 + 水泥助磨剂　；参考：《济南大学》2015年硕士论文

【摘要】：水泥粉磨过程中耗能高、能量利用率低,掺加少量助磨剂就可以起到提高粉磨效率,改善水泥颗粒级配,提高水泥性能的作用。本文针对小分子助磨剂应用中的问题,以三乙醇胺作为核分子,合成了超支化型大分子水泥助磨剂,对其合成工艺、性能进行了系统研究,旨在开发新型超支化水泥助磨剂应用于水泥混凝土中,改善水泥性能和促进水泥厂的节能减排。本文研究具体内容和实验结果如下:1.合成两种不同类型AB2型增长单体,用三乙醇胺作核分子,通过酯交换和酯化反应分别生成了超支化聚胺-酯(HPE)和超支化聚酰胺-酯(HPAE),通过控制核分子和AB2单体比例为1:3,1:9,1:21分别合成了第一代,第二代,第三代超支化聚合物。对合成的两种超支化聚合物进行傅立叶红外分析、元素分析、羟值和热失重测试,结果表明合成的产物与设计的超支化分子结构相符,能应用到助磨剂领域。2.通过粉磨后水泥细度测试结果,超支化型助磨剂最佳掺量:HPE-G1、HPE-G2和HPAE-G1的最佳掺量是0.020%,45μm筛余分别降低了47.5%、52.5%和49.4%;HPE-G3、HPAE-G2和HPAE-G3的最佳掺量是0.010%,45μm筛余分别降低了48.7%、50.0%和46.8%;HPAE-M最佳掺量是0.015%,45μm筛余降低了48.1%。在它们最佳掺量时,掺加超支化助磨剂的水泥样品比三乙醇胺具有更高的比表面积,通过粒径分布结果遴选了HPE-G2、HPAE-G2和HPAE-M三种超支化型水泥助磨剂,它们3-32μm颗粒含量分别达到了68.8%、67.9%和66.4%,其中HPE-G2和HPAE-G2休止角分别降低了32.7%,25.0%。3.测试助磨剂对P·I水泥水化影响,与空白相比,在最佳掺量时,HPE-G2的3d和28d抗压强度增长率分别为18.1%和30.5%;HPAE-G2的3d和28d抗压强度增长率分别为15.7%、28.0%;HPAE-M的3d、28d增长率分别为26.4%、29.9%。掺加超支化型助磨剂的水泥样品与三乙醇胺相比,凝结时间更接近空白且水泥硬化浆体的化学结合水含量更高,3d时HPAE-M化学结合水含量最高为22.16%,28d时HPE-G2的化学结合水含量最高为23.32%。结合对水泥水化样3d和28d的XRD图谱和SEM照片分析,表明各超支化型助磨剂均能激发促进早期C3A和后期C3S的水化,这与超支化型助磨剂能提高水泥力学性能一致。4.实验室合成超支化型助磨剂与减水剂的适应性很好,提高了助磨剂适用范围,在助磨、增强方面表现优异。5.对于超支化助磨剂助磨增强的机理,通过其与三乙醇胺对比,探讨醇胺基团在水泥粉磨和水化过程中的作用机理,分析认为超支化型助磨剂具有多吸附位点,更易吸附在水泥颗粒表面,同时其空间位阻作用明显,提高了水泥颗粒分散性能,从而提高了粉磨效率、促进了水泥水化,起到了助磨增强作用。
[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.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ172.463

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