Synthesis And Application Of The Aluminum Titanium Coupling Agent

Two kinds of aluminum titanium(Al-Ti) coupling agents weresuccessfully synthesized in this paper by using the polyaluminiumchloride and the butyl titanate as the main raw materials which modifiedwith stearic acid and myristic acid respectively. The structure of theas-prepared samples were characterized and analyzed by the FTIRspectra. The synthesis procedure of Al-Ti coupling agents was alsostudied and then Al-Ti coupling agents were applied to modify thesurfaces of the powders (CaCO3/TiO2). Comparing the powders beforeand after modification, we observed and studied the changes of thepowders’ surface performances. The CaCO3unmodified and modifiedwere applied in the paper coating, and then the physical performancesof the papers were measured.In the synthesis process of the aluminum titanium coupling agents,the first step was synthesizing Sec-propanolato aluminum chlorohydratecomplex. The better reactive conditions were as follows: the reactiontemperature was100°C, the reaction time was1h, the mass proportionof the polyaluminium chloride and the1,2-propanediol was5:2. Thesecond step was to synthesize aluminum titanium coupling agents byreacting the synthetic alcohol aluminum complex with the butyl titanate.The results indicated that the optimal technological conditions tosynthesize the aluminum titanium coupling agents (the stearic acid asthe organ functions) with yield of91%were as follows: the componentproportion of the stearic acid and the butyl titanate was2:3, the reactiontime was2h, the reaction temperature was105°C; While the optimaltechnological conditions to synthesize the aluminum titanium couplingagents (the myristic acid as the organ functions) with yield of88%wereas follows: the component proportion of the of the myristic acid and thebutyl titanate was2:3, the reaction time was1.5h, the reaction temperature was115°C.Compared with the unmodified inorganic powders(CaCO3/TiO2),the modified powders have better performance. For example, theactivation degree was increased and viscosity and settling velocity inthe liquid paraffin was reduced. At the same time, thelipophilic-hydrophobic property was enhanced and the dispersity wasimproved after modification. Therefore the effect of the surfacemodification to inorganic powders by Al-Ti coupling agents wasexcellent. What’s more, the phase of the powders did not change aftermodification. This result showed that the Al-Ti coupling agents wereadsorbed physically on the surfaces of the inorganic powders rather thanchemical reaction.Compared with the coating papers added the unmodified CaCO3,the papers added the modified CaCO3have better performance,including the significant improvement of the tensile strength, burstingstrength and tear resistance and the printing ink absorption performancewas also improved greatly.The above study showed that the physical performance of thecoating paper can be improved through adding the synthetic Al-Ticoupling agents. However, the reports about Al-Ti coupling agentapplied in the coated paper are rare. Thus this research has utility valueand great meaning.