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麦草乙醇木素通过先羟甲基化提高反应活性,再磺化的方法制备水泥减水剂,研究了改性乙醇木素水溶液的性质及其对水泥的影响,并用红外光谱法测定了乙醇木素改性前后的结构特征。结构表明:改性乙醇木素能提高水泥的净浆流动度,在水灰比为0.35,掺量为0.5%时净浆流动度为200mm。改性乙醇木素显著降低溶液的表面张力,具有表面活性剂的特征。掺入改性产物的水泥减水剂的水泥水化产物钒钙石晶体的生长较少,使得水化硅酸钙结构致密,水泥内部结构更加致密,孔隙较少,水泥渗水性,强度都会有所提高。相比乙醇木素,改性乙醇木素中含有-SO3H的特征吸收峰,乙醇木素发生了磺化反应。
Wheat straw lignin through the first methylation to improve reactivity, and then sulfonated cement superplasticizer prepared by the study of the nature of the modified ethanol lignin aqueous solution and its impact on the cement, and the determination of the ethanol by infrared spectroscopy Structural characteristics before and after modification. The results show that modified lignocellulose can increase the fluidity of cement paste. When the water-cement ratio is 0.35, the fluidity of cement paste is 200mm when the dosage is 0.5%. Modified ethanol lignin significantly reduces the surface tension of the solution, with surfactant characteristics. The cement hydration products of cement superplasticizer mixed with modified products have little growth of vanadite crystals, making the hydrated calcium silicate structure compact, the internal structure of the cement is more dense, the pores are less, the water permeability and strength of the cement will be Increased. Compared with ethanol lignin, modified lignin contains -SO3H characteristic absorption peak, lignin sulfonation occurred.