粉煤灰提铝残渣改性制备橡胶填料

Preparation of rubber filler by modified residue after extracting alumina from fly ash

以酸法提铝后的粉煤灰残渣为填料,通过研磨改性等处理后用于增强丁苯橡胶,研究残渣的添加量、粒径、不同改性剂处理对丁苯橡胶补强效果的影响,并对不同改性剂改性效果和机理进行探讨。结果表明:当残渣和白炭黑质量相当时,改性产品拉伸强度为5.33 MPa,断裂伸长率较白炭黑增大30%左右,为851.26%;当残渣研磨60 min(d50=5.35μm)时其拉伸强度为5.70 MPa,断裂伸长率可以达903%;经过4种改性剂处理后,橡胶的断裂伸长率和拉伸强度有明显的变化,其中硅烷偶联剂KH550改性后,其拉伸强度高达9.12 MPa,硅油改性后断裂伸长率增大到949.86%。

Residue after extracting alumina from fly ash by acid method, used as filler, was applied into reinforcing SBR by grind and modification etc. The influence was studied on the effect of the reinforcement for SBR by the residue addition, granularity and different modifiers and finally discussed the effect and mechanism of different modifiers. The results show that, if using equal amount of residue and silica, tensile strength of the former is 5.33 MPa and result in rupture elongation improvement about 30%more than silica, up to 851.26%. With the residue being grinder for 60 min（d50=0.35 μm）, the tensile strength is 5.70 MPa and the rupture elongation can be up to 903%. After being modified, there is an obvious change in rubber＇s tensile strength and elongation at rupture. The tensile strength of modified KH550 can be up to 9.12 MPa, and the elongation at rupture of modified silicone oil is improved to 949.86%.