Research On Preparation And Performance Of Solid Buoyancy Materials

This thesis aimed at research on preparation and performance of solid buoyancy materials. Solid buoyancy materials which has lower density, higher strength were manufactured, using epoxy resin E51 as substrate and hollow glass microballoon(HGM)S38HS as filling material. The effects of the volume fraction of hollow glass microballoon on the properties of solid buoyancy materials are systematically studied, and coupling agent activation treatment on hollow glass microballoon, ultrasonic treatment on carbon nanotubes and adding carbon nanotubes to solid buoyancy materials are researched, then the properties such as density, strength and water imbibition are analysised.(1)For density, with the increasing of volume fraction of hollow glass microballoon, the density of solid buoyancy materials decreases. During the preparation of the hollow glass solid buoyancy materials/epoxy resin solid buoyancy material, air bubble are introduced into the system, so the real density value of solid buoyancy materials is generally lower than the calculated density valve.(2) When the volume fraction of hollow glass microballoon is low, resin matrix is the main subject to bear the load; when the volume fraction of hollow glass microballoon is high, the hollow glass microballoon is the main subject to bear the load. When the volume fraction of hollow glass microballoon is rather than 40%, with the increasing of volume fraction of hollow glass microballoon, the degree of broken hollow glass microballoon becomes strong, and compressive strength and compression work of solid buoyancy materials reduces. When the volume fraction of hollow glass beads is in a range of 40%～60%, the specific compression strength of solid buoyancy materials, it means that compressive strength and density become to a balance, and the materials is more in line with the conditions of use.(3)For water imbibition, within a certain range (volume fraction of hollow glass microballoon< 60%), with the increasing of volume fraction of hollow glass microballoon, water imbibition of solid buoyancy materials reduces. But when the volume fraction of hollow glass microballoon exceeds 60%, water imbibition of solid buoyancy materials is very big. As the extension of suction time, bibulous rate of solid buoyancy materials become small. The water imbibition of solid buoyancy materials in simulated sea water is generally less than that of solid buoyancy materials in distilled water.Coupling agent activation treatment on hollow glass microballoon can improve the combination of hollow glass microballoon with epoxy resin, then effectively improve the mechanical properties of solid buoyancy materials. Add carbon nanotubes to solid buoyancy materials, and explore its effect on the mechanical properties of solid buoyancy materials. The results show that adding carbon nanotubes can effectively improve the mechanical properties of solid buoyancy materials.Applying ultrasonic treatment on carbon nanotubes, and explore the dispersion of carbon nanotubes in the matrix. Results show that applying ultrasonic treatment on carbon nanotubes can reduce the scale of carbon nanotubes group, then improve the dispersion of carbon nanotubes in the matrix, thus have a positive effect on the mechanical properties of solid buoyancy materials. But, only when the mass fraction of carbon nanotubes is at a high level, carbon nanotubes will shows serious phenomenon of union in the matrix, in this case, the ultrasonic treatment can effectively improve the phenomenon of union, ultimately reflect in the improvement of the mechanical properties of the solid buoyancy materials.In this paper, the density of the solid buoyancy materials is from 0.50 to 0.89 g/cm3, its compressive strength is from 47.5 to 98.9 MPa, its specific compression strength is from79.0 to 119.8 MPa·cm3/g, its compression work is from 31.1 to 98.1 kj/m2, and its bibulous rate is generally less than 1%.