Effect Of Adding Aluminum Borate Whisker On Mechanical Properties Of Silicone Rubber

Objective:The aluminum borate whiskers as an inorganic filler in a different quality than adding to the soft silicone rubber liner and test their physical and chemical properties, and does not add aluminum borate whiskers were observed in the control group were compared to the amount of aluminum borate whisker filled silicone rubber affect the performance of soft liner and its mechanism analysis based on the results of SEM observation.Methods:A mixed solution of a certain mass ratio of 4.0 to 5.0 Ethanol, distilled water and acetic acid dubbed PH value, then the mass fraction of 5% of a silane coupling agent added dropwise to the mixed solution to complete its pre-hydrolysis. The silane coupling agent is hydrolyzed by more than 2% by mass of aluminum borate whiskers added dropwise distilled water, stirring the dispersion after the ultrasonic vibration, the resulting slurry was allowed to stand for drying after removal of the water break, complete aluminum borate Surface Modification of whiskers. The silane coupling agent treatment after aluminum borate whiskers mass fraction of 2%, 3%, 4%, 5% addition is added to soft silicone rubber lining, which is not added as a control group whiskers, mixed After following national standards added to the previously prepared mold, made of different test items related specifications, the size of the specimen. Each mass fraction has four mechanical detection index, a test specimen produced 6, the same content recorded as a group, i.e., a total of 120 groups five specimens. Will be completely cured specimen placed in artificial saliva at 37 degrees C, 24 hours after removing the spare. With a Shore A hardness test its Shore hardness, with a computer-controlled universal dynamometer test the tensile strength, tensile elongation and changes in bond strength and other mechanical properties, respectively, in 7 days, 15 days, 30 days to measure its water absorption and dissolution rate. In the scanning electron microscope with different contents of aluminum borate whiskers soft silicone rubber dispersion of lining material. By adding a comparison group of 4 different concentrations whisker composite mechanical properties and the control group, according to test results analysis optimum filling amount of whiskers, and further a silicon rubber-like material provides a soft liner in the practical application of theory based on experimental data and prospects to expand its use.Results:1.Scanning electron microscopy: the concentration range of the mass ratio of aluminum borate whisker add this experiment, the dispersion of soft silicone rubber lining are ideal. When filling volume aluminum borate whisker whiskers does not exceed 3% of the sparse, when 4%, evenly distributed whiskers, no intertwining reunion phenomenon, but when the content continues to increase to 5% of visible whisker compact arrangement, part agglomeration occurs. Visible, with increasing amounts of aluminum borate whisker, increasing the degree of polymerization, the silicone rubber soft lining material dispersion is getting worse. 2.According to the test results of the mechanical properties of the analysis, with the increasing amount of aluminum borate whisker filled, the tensile strength of soft silicone rubber lining, tensile elongation showed decreasing trend after the first increase in the quality of filling reach a maximum ratio of 4%, the tensile elongation(362.56 ± 5.36)%, the tensile strength of(2.23 ± 0.14) Mpa than the control group increased by 13%, while the Shore hardness was gradually increased and are in the ideal range. Compared with the control group added aluminum borate whiskers soft silicone rubber lining material whose mechanical properties are improved, on the whole amount when added 4 percent, the best overall performance composites. 3. Over time, the same group of soft silicone rubber lining absorption in artificial saliva presented first increases and then decreases after the law, and the dissolution rate is increasing. For each group adds soft silicone rubber lining of different mass fraction of aluminum borate whisker water absorption and dissolution rate of the control group did not change significantly(P> 0.05) compared to the same period of time.Conclusion:Experiments found that when the weight ratio of aluminum borate whiskers is 4%, the silicone soft liner optimum mechanical properties, and is now the whiskers in the matrix dispersion is also good, no agglomeration, in favor of the matrix and reinforcing presenting intermediate force.