As a new type of filling material, hollow glass beads have the following obvious advantages.
① The density of hollow glass microbeads is small, the packing density is 0.10~0.30g/cm³, the actual density is 0.10~0.50g/cm³, as a filler can significantly reduce the density of the material, so as to prepare low density composite materials.
The shape of hollow glass beads is smooth and round, with isotropy and no sharp corners, so there is no stress concentration phenomenon, which can effectively prevent stress cracking. Compared with other fillers, the specific surface area of spherical microbeads is the smallest, which means that the viscosity of the system changes little with the increase of filler amount.
(3) Because the glass beads are smooth and have considerable crushing resistance, the viscosity of the curing reaction system is not large, the wear of the kneading machine and the mold forming machine is small, and the fluidity in the flow channel and the mold is good.
(4) The expansion coefficient of hollow glass beads is small, good dispersion in the resin, and isotropy, so it can effectively reduce the shrinkage of products, prevent products caused by residual strain bending, warping deformation, so the product size stability is high.
⑤ Good thermal stability, flame retardant, thermal decomposition temperature is greater than 1450℃, not easy to deformation, as polymer filling material, can improve the flame retardant properties of polymer, can be used in building materials and paint industry; Good electrical insulation, can be used for various electrical switchgear, instrument panel, electronic packaging materials filler; High chemical stability, acid and alkali resistance, radiation resistance; Good transparency, can be used to make translucent products, glass beads can also absorb ultraviolet light, improve the light stability and reflection of products.
⑥ The packing density is very small, as a polymer filling material, less than other mineral fillers, small loading mass, save the amount of polymer, so it can reduce the cost of products. (Excerpt from 《Solid Buoyant Materials》)
