The Study On Microspheres/Polymer Compoisties And Interaction Of Coupling Agents

The application in the polymer material opens up a new field for the complex application of flyash. As a kind of ploymer compound additive, flyash microspheres must be activized and modified. In this paper, the coupling agent and the technological conditions used in the PVC, nature rubber and unsaturated polyester resin are defined, it provides the technical support for the coupling and modification of microspheres and other inorganic fillers.The synthesis of aluminate ester coupling agent consists of the synthesis of isopropanolaluminium and aluminate ester. The best synthesis conditions of isopropanolaluminium is as follows: reaction temperature is 80 , reaction time is 5 hours, the actual amount of isopropanolaluminium is 5 times of the theroetical amount, the collecting ratio is more than 90%. The experiment results show that the surface polarity of microspheres is changed through the treatment of coupling agent, its affinity and the dispersion properties in the liquid wax are improved. The modification effect of microspheres is good through the using of ester aluminate coupling agent and silane coupling agent. The experiment results show that the surface becomes oilphilic after the modification, the particle number of gathering state is decreased, the dispersion degree is improved.The main crystal phase of flyash includes mullite, magnetite, hematiite, sillimante and maghemite through the XRD analysis. The crystal phase is changed after roast with alkali, the main crystal phase, mullite and sillimante, disappears during the reaction process, and produces high form crystal phase NaAlSiO4. Through the SEM analysis, it shows that, after roast for 0.5 hour hi 1000, the reaction between flyash microspheres and aickle occured, the crystal phase was recombinated, part of the microspheres was surrounded by the destructive crystal phase. After 2 hours, the reaction finished, SEM photo shows that it has become compact uniform aggregate.The highest moment will decreased with the increasing filling amount of microspheres. Comparing with the PVC without microspheres, The highest moment and balance moment of microspheres/PVC system decreases, the thermal stable time is more than 30 minutes during the processing course, hi the active microspheres/PVC systems and active CaCO3/PVC systems tensile strength decreases with the increasing amount of fillers. The tensile strength of active microspheres/ PVC system is stronger than that of active CaCO3/PVC system. The SEM analysis shows that unactivemicrospheres are separated from the rosin clearly, the interface of microspheres is distinct, but the active microspheres have not distinct interface in the rosin system, the coupling agent links the microspheres and rosin. Through the against corrosion experiment, it proves that the anti-corrosion property of active microspheres/ PVC is better than that of active CaC03/PVC.Under the same preparing conditions, the hardness and tensile strength of unactivized microspheres/rubber composite as the same as CaCO3/rubber composite. So flyash microspheres can substitute CaCO3 as new filler in rubber. If the flyash microspheres are activized by aluminate ester and doped in NR, the extend ration and permanent set of NR is better than the NR doped with SRF and superfine CaCO3, but the hardness and tensile strength is worse than the last one. If the microspheres are activized by silane coupling agent and aluminate ester coupling agent, the mechanic properties of the first one are better than the second one.. If the microspheres are activized by silane coupling agent and doped in SBR/NR, the coal carbonization time is longer than the SBR/NR doped with SRF. The micropheres activized by composite silane coupling agent can partly subsitute SRF and be doped in SBR/NR.The gel time of unsaturated polyester resin shortens with the increasing of solidifying temperature. Check the microspheres activized by aluminate ester coupling agent against the microspheres activized by silane coupling agent and ester titanate coupling agent, we can get the ef...