Study on preparation and properties of solid buoyancy materials by vacuum vibration casting

doi:10.19936/j.cnki.2096-8000.20230528.008

Abstract

Abstract: A novel process by combination of vacuum and vibration was developed for the preparation of solid buoyancy materials (SBM). Epoxy resin is used as the matrix and two kinds of hollow glass microspheres with different sizes were mixed as the lightweight fillers. The influence of the vibration time on the curing temperature of the hollow glass microspheres/epoxy system, as well as on the bubble defects, density, water absorption and mechanical properties of SBM were studied at a certain vibration frequency. The results show that the vibration time is an important factor affecting the quality and performances of the SBM. If the vibration time is too long, the center temperature of the hollow glass microspheres/epoxy system increases too fast, and the accumulation of curing and vibration heat leads to the resin exploding. If the vibration time is too short, the hollow glass microspheres/epoxy system will not uniformly mixed, leading to the unevenly distributed density of SBM, and the resultant SBM will have to many pores defect. The optimal vibration time is 90 min, the SBM sample prepared under this condition has a low density (0.51 g/cm³), low water absorption rate (0.37wt%), and excellent mechanical properties (e.g. the compressive strength of 31.6 MPa and the impact strength of 5.29 kJ/m²) as well as a uniform distribution. This newly developed process is suitable for the preparation of large-sized SBMs, and it can meet the requirements for the application of SBMs for the infrastructure construction of both marine equipment and offshore platforms within 1 000 meters of water.

Key words: solid buoyant material, vacuum vibration casting, epoxy/amine curing agents, hollow glass beads, vibration time, composites

CLC Number:

TB332

JI Youping, ZHANG Zuochao, YANG Wentao. Study on preparation and properties of solid buoyancy materials by vacuum vibration casting[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(5): 53-58.

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