The Impact of Hollow Glass Beads on Adhesive Viscosity and Solutions for Thickening

Low viscosity indicates good flowability of the adhesive, but adding inorganic mineral fillers will increase the viscosity.

The degree of viscosity increase depends on the type, shape, and amount of filler. When the filler is at the nanoscale, with a large surface area and high oil absorption, viscosity rises significantly. Plate-like or fibrous fillers, due to the larger gaps between particles, also increase the adhesive’s viscosity. Additionally, fillers with a rough surface, such as calcium carbonate or fumed silica, make the adhesive harder to flow, resulting in higher viscosity.

Factors affecting viscosity:

1.Filler amount: The more filler added, the more difficult the flow, and the higher the viscosity.

2.Particle shape: Spherical particles have lower viscosity, while irregular or elongated particles increase viscosity.

3.Particle size distribution: Smaller particles increase viscosity, while uniform particle size can reduce it.

4.Surface roughness: Rougher particles lead to more difficult flow and higher viscosity.

Impact of Hollow Glass Beads:

Hollow glass beads are smooth-surfaced spheres with low oil absorption, thus having a minimal effect on adhesive viscosity.

Solutions for Thickening:

1. Adjust the adhesive formulation.
2. Replace existing fillers with fillers of the same volume fraction.
3. Choose larger-diameter hollow glass beads or apply surface treatments like coupling agents to reduce viscosity increases.

Through selecting appropriate fillers and adjusting formulations, the viscosity of adhesives can be controlled.

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