磺化聚天冬氨酸减水剂的制备与性能研究

发布时间：2018-04-03 19:16

本文选题：磺化聚天冬氨酸　切入点：减水剂　出处：《混凝土》2017年12期

【摘要】：以L-天冬氨酸为原料通过热缩聚反应制得不同相对分子质量的聚琥珀酰亚胺(PSI),将PSI与氨基磺酸按照不同摩尔比进行接枝,水解后制备出磺化聚天冬氨酸减水剂(SPAsp)。探讨了PSI相对分子质量、摩尔比和减水剂掺入量对水泥净浆流动性的影响,研究了聚天冬氨酸减水剂(PAsp)和SPAsp对混凝土的坍落度、抗折强度以及水泥水化物颗粒表面zeta电位的影响;采用FT-IR对所制备的减水剂进行了表征。结果表明:在PSI相对分子质量为56 398,摩尔比为0.75∶1时制备的SPAsp综合性能最好,当其掺量为1.2%时,水泥净浆流动度达到249 mm,与PAsp相比提高了52.17%,120 min后混凝土坍落度经时损失率为4.3%;摩尔比为0.5∶1时制备的SPAsp,其掺量为1.2%时,混凝土28 d的抗折强度最大,为5.514 MPa;SPAsp的加入提高了水泥水化物颗粒表面zeta电位电负性绝对值,表明磺酸基的引入能够增加水泥水化物颗粒间的静电斥力。
[Abstract]:Poly (succinimide) with different molecular weight was prepared by thermal condensation of L- aspartic acid. PSI was grafted with amino sulfonic acid at different molar ratios to prepare sulfonated polyaspartic acid superplasticizer Spa.The effects of relative molecular weight of PSI, molar ratio and water reducing agent content on the fluidity of cement paste were discussed. The slump of concrete by polyaspartic acid water reducer (SPAsp) and polyaspartic acid water reducer (SPAsp) was studied.The effects of flexural strength and zeta potential on the surface of cement hydrate particles were investigated, and the water reducer was characterized by FT-IR.The results show that when the molecular weight of PSI is 56.398 and the molar ratio is 0.75: 1, the comprehensive properties of SPAsp are the best.The absolute value of zeta potential electronegativity on the surface of cement hydrate particles was increased with the addition of 5.514 MPA ~ (2 +), which indicated that the introduction of sulfonic group could increase the electrostatic repulsion between cement hydrate particles.
【作者单位】：太原理工大学化学化工学院;
【基金】：国家自然科学基金青年基金(201304066) 山西省科技攻关项目(20100311117)
【分类号】：TU528.042.2

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