Study On Clean And Efficient Production Technology Of High Compression Resilience Rubber Sealing Composites

At present,some western developed countries have successfully developed the wet-continuous and efficient production of high-performance non-asbestos rubber sealing composite materials technology,but the domestic use of this method is still in the exploration stage,and the material compression resilience performance is not ideal.In this paper,by studying the good retention and drainage system to ensure that the rubber sealing composite material is successfully copied into the shape,,and the three aspects of fiber,filler and vulcanization process are studied to improve the compression resilience of the product.The findings are as follows:Firstly,the rubber seal composite mixed slurry retention and drainage system was studied.The aluminum sulfate and CPAM/bentonite two retention and drainage systems were combined.The amount of aluminum sulfate was 6%,CPAM was 0.12%,and bentonite was 0.4%.At this point,the filtrate was clarified,the pH value was 7.37,the beating degree was 13.5°SR,and the retention rate was 95.8%.The retention and drainage effect was the best.Secondly,the effect of fiber composition on the performance of rubber sealing composites was studied.The polyacrylonitrile fiber had a highly fibrillated structure with a high content of fine fibers and a wide range of fiber length and width.When the addition amount was 20%,the sealing material had a compression ratio of 9.52%,a rebound rate of 28.0%,and a tensile strength of 21.27 MPa.The polyacrylonitrile fiber was hydrolyzed by alkali treatment,the hydrophobic group was converted into a hydrophilic group,and the surface of the fiber was etched,and the hydrophilicity was improved.The optimum modification condition was 6%NaOH concentration and 80℃ modification temperature.The modification time was 20 min.At this time,the compression ratio of the sealing material was 8.93%,the rebound rate was 35.53%,and the tensile strength was 23.60 MPa.The surface of the carbon fiber was uneven,and there were grooves arranged along the axial direction of the fiber,which could be well combined with other components by the sizing agent treatment.When the carbon fiber was added at 15%,the sealing material had a compression ratio of 15.48%,a rebound rate of 36.33%,and a tensile strength of 24.85 MPa.The glass fiber overlapped with each other in the sealing material to form a three-dimensional network structure.After treatment with KH-550,it could better adhere to components such as latex.When the amount was 15%,the compression ratio of the sealing material was 16.24%,and the rebound rate was 16.24%.It had a tensile strength of 16.34 MPa of 34.75%.Comparison of loss rate of sealing materials prepared by three kinds of fibers at 300℃and 600℃:glass fiber<carbon fiber<modacrylic fiber.Glass fiber was blended with mineral fiber.The amount of glass fiber was 20%,and the amount of Lapinus fiber was 5%.The sealing material had the best performance,the compression ratio was 15.73%,the rebound rate was 36.42%,and the tensile strength was 18.95 MPa.Finally,the effects of filler components and vulcanization processes on the performance of rubber-sealed composites were investigated.The microscopic morphology of the glass fiber powder was a smooth rod-like structure with different lengths.As the mesh size increases,the fiber length decreases,and the fine particles increase.The optimum mesh number was 500 mesh,and when the addition amount was 45%,the sealing material The compression ratio was 18.60%,the rebound rate was 47.20%,and the tensile strength was 7.80 MPa.The structure of the flexible graphite had no obvious change after oxidation,but the surface with non-polar groups was slightly oxidized,and the dispersibility in water was improved.It is used together with the glass fiber powder.The optimum addition amount was 10%of oxidized flexible graphite,glass fiber powder 35%,the sealing material had a compression ratio of 16.52%,a rebound rate of 51.60%,and a tensile strength of 12.42 MPa.Secondary vulcanization improved the performance of rubber-sealed composites,resulting in reduced compression,increased density,rebound,and tensile strength.The rubber sealing composite with 10%of oxidized flexible graphite and 35%of glass fiber powder had the best comprehensive performance after secondary vulcanization.At this time,the compression ratio was 14.66%,the rebound rate was 56.13%,and the tensile strength was 13.59 MPa.