Study On The Properties Of Potassium Titanate Whiskers Reinforced Non-asbestos Gaskets By Beater-addition Process

Potassium titanate whiskers,a new-type fibrous sub-nanometer materials with excellent mechanical,physical and chemical stability,are widely used as friction materials,thermal insulation materials,and reinforcement materials.Some characteristics of them are also needed for the gasket,so this paper studies the feasibility of enhancing the performance of the gasket by introducing Potassium titanate whiskers into the Beater-addition process（BA）of non-asbestos gasket.Firstly,constructing a table of mixed-level uniform designsU₁₂（12⁴?3?4 ²）through Uniform Design Experimentation to determine the optimized formula of the seven variables including QY cotton fiber,mineral cotton fiber,paper fiber,aramid fiber,kaolin,nitrile latex and styrene-butadiene latex.Then adopting orthogonal experimentation₉L（3 ⁴）to explore the influence of Potassium titanate whiskers modified by different kinds of silane coupling agent in various concentation and duration on the Beater-addition process（BA）of non-asbestos gasket,and to determine the optimal surface modification scheme for treating potassium titanate whiskers with silane coupling agent.The dispersion of the modified potassium titanate whiskers was observed by SEM scanning electron microscope,and the physical and chemical changes of the potassium titanate whiskers before and after modification were analyzed by FTIR.Finally,exploring the optimal range of replacing kaolin with potassium titanate whiskers which have similar properties with the fomer in the process of BA of non-asbestos gasket,then observing micro-combination of gaskets by scanning electron microscope（SEM）and analyzing the reasons for performance enhancement as well as the element and compound composition of the gaskets with EDS and XRD.Through the above research,the following conclusions are drawn:（1）After Studying the seven influential factors in the gasket formula through the Uniform Design Experimentation,the relationship between each component and the performance was analyzed through the regression equation in order to optimize the formula,and the content ratio of the seven variables was obtained as follows:10%QY cotton composite fiber,15%paper fiber,15%mineral wool fiber,6%aramid fiber,20%kaolin,8%nitrile latex,and 3%styrene butadiene latex,which will be used in subsequent experiments.（2）The orthogonal experimentation was designed to research the influence of Potassium titanate whiskers modified by different kinds of silane coupling agent in various concentation and duration through the Beater-addition process（BA）of non-asbestos gasket,then the optimal treatment plan was obtained and verified.The optimal surface treatment scheme was:silane coupling agent KH-560 at a concentration of 3%,and the coupling reaction time is 2 hours.Through FTIR analysis,it was found that the potassium titanate whisker and the silane coupling agent formed a new Si-O-Si bond,which improved the dispersibility of the potassium titanate whisker.SEM found that the dispersion degree of potassium titanate whisker in the optimized scheme was better than other groups of experiments.（3）A single-factor test was used to explore the test plan for replacing the kaolin with potassium titanate whiskers in the BA of non-asbestos gasket.The optimal replacement range was 20%based on the data results,and the gasket prepared by the optimal replacement formula was found by SEM is superior to the gasket prepared by the optimized formula in the degree of combined adhesion.Both macroscopic performance and microscopic combination prove that potassium titanate whiskers are feasible in enhancing the performance of sealing gaskets.