Hollow glass beads have the advantages of low density, low thermal conductivity, high compressive strength, good fluidity, low oil absorption rate, corrosion resistance and chemical stability, and then surface treatment; it has broad application space in oil drilling, thermal insulation coating, engineering plastics, rubber elastomer, heavy anticorrosive coating, adhesive, buoyancy material, emulsion explosive, electromagnetic shielding material and other fields.
1.The application of hollow glass microbeads in oil-drilling cement mud
The application of hollow glass beads in oil drilling is mainly based on low density and high compressive strength characteristics. Minjiangbenet et al. used G-grade cement, closed-cell perlite, hollow glass beads, reinforcing materials, fly ash, and micro-silicon to prepare cementing cement slurry. When the content of hollow glass beads was 10% ~ 22%, low-density cement slurry with a density of 1.19 ~ 1.28g/cm3 and excellent performance could be prepared, and the compressive strength of 48h could reach 12.5MPa. It solves the technical problems that other low-density cement slurry can not take into account: low density, high compressive strength, strong pressure resistance, and leakproofing.
Liu Kai et al. investigated the compatibility, rheology, and stability of hollow glass microbeads and cement slurry and found that hollow glass microbeads and cement admixtures have good compatibility, which can effectively reduce the density of cement slurry. The hollow glass bead cement slurry has good rheology and can form a good spatial network structure with the cement slurry. The density difference between the upper and lower layers of the hollow glass bead cement slurry with different formulations is less than 0.05g/cm3, and the stability is good.
2. Hollow glass beads in the application of heat insulation coatin
Hollow glass beads have thin walls and hollow structures, so they have low thermal conductivity, the lowest thermal conductivity is 0.038W/ (m·K), and have broad application prospects in the thermal insulation properties of coatings.
Sun Weifang et al. use pure acrylic emulsion as a film-forming agent, rutile titanium dioxide as a reflective pigment, and hollow glass beads as a thermal insulation filler to prepare reflective thermal insulation coating for external walls, the reflectivity of sunlight reaches 0.88; the maximum temperature difference of thermal insulation is 12.5℃, and has a good reflective thermal insulation effect.
3. Hollow glass beads in the application of engineering plastics
With the progress of society, engineering plastics with high strength, stiffness, toughness, and fatigue resistance have been used as the main material of plastic strip steel and are widely used in the automotive industry, electronic appliances, power tools, sports equipment, and other fields. However, to meet the needs of lightweight, various engineering plastics are processed thinner and thinner, and there is a phenomenon of serious warping of thin-walled parts, mainly caused by the anisotropy of its reinforcing material. As a low-density, isotropic functional filling material, hollow glass beads can meet the needs of lightweight materials on the one hand and prevent material warping on the other hand.
Guo Tanghua et al. used nylon 6 as matrix material, hollow glass beads, and glass fiber as fillers and prepared low-density reinforced nylon 6 by twin-screw blending and extrusion. The results show that the extrusion machine can reduce the breakage of hollow glass beads by side feeding; adding hollow glass beads can reduce the density of the material, improve the dimensional stability of the material, and prevent the warping of the workpiece; the higher the proportion of hollow glass beads, the smaller the warping deformation. The pretreatment of hollow glass beads did not improve the material's mechanical properties.
4. Hollow glass beads in the application of rubber elastomer
The main application of rubber elastomer is to reduce the material density and volume cost by using the low density and high filling ratio of hollow glass beads. At the same time, the ball effect of hollow glass beads is a smooth, positive sphere to improve the processing flow of the material. In addition, the properties of low thermal conductivity are also used to prepare flame retardant and heat insulation rubber elastomer materials.
Hu Guangjun et al. added different contents of hollow glass microbeads and white carbon black in styrene-butadiene rubber for performance comparison. The results show that the addition of hollow glass beads has no effect on the wear resistance of rubber, but the tensile strength is slightly increased, and the processing viscosity is decreased. The rubber density and material cost are greatly reduced when hollow glass beads are added.
Technical Parameter of Hollow Glass Sphere Hollow Glass Beads:
| Product Name |
Content |
Particle Size |
True Density |
Bulk Density |
Color |
| Hollow Glass Sphere |
Borosilicate glass |
5- 100um |
0.12-0.70 g/cm3 |
0.10-0.40 g/cm3 |
White |
5. Hollow glass beads in the application of heavy anti-corrosion coatings
Hollow glass beads can also be important in epoxy zinc-rich heavy anticorrosive coatings. Anonymous elaborated on the irreplaceable role played by hollow glass beads in the "Pioneer Shield" epoxy zinc-rich primer of Haihong Old Man:
1)The volume effect of hollow glass beads helps improve zinc powder dispersion. Because its spherical structure is similar to ball bearings, it can improve the fluidity of the coating, prevent the settling of zinc powder and other conductive fillers, and improve the efficiency of zinc powder.
2)The isotropy of the hollow glass bead positive sphere, which prevents the warping or shrinking of the paint film due to the inconsistent stress, improves the anti-cracking ability of the paint film and prevents the expansion of the paint film micro-cracks, thus improving the water permeability resistance of the paint film.
3)The hollow glass beads also play an important role in the shielding function of the paint film.
The insoluble corrosion products (chloride, oxide) generated by the coating during the retest process will be deposited on the surface of the hollow glass beads, fill the paint film cracks, and perform self-healing cracks to prevent the corrosion products from contacting the steel matrix.
6.Application of hollow glass beads in adhesives
Building sealant and electronic potting adhesive are currently the largest sources of organic adhesive. With the development of modern technology, many new requirements have been put forward for these two types of adhesives: low density, energy saving, safety, reliability, and low cost, which require these adhesives to find new technological breakthroughs. As a multi-functional filler, Hollow glass beads also play an important role in the adhesive industry.
Cao prepared low-density flame-retardant and heat-conducting silicone potting adhesive using hollow glass microbeads. With the increase in hollow glass microbeads, the viscosity of the adhesive material gradually increased, and the flattening property worsened. Still, the density of the adhesive material gradually decreased, and the cost of the adhesive material decreased. When the amount of hollow glass microbeads is 10 parts, It can meet the requirements of low density, thermal conductivity, flame retardant, electrical insulation, and other indicators of power battery potting glue, especially with low density, which significantly reduces costs and lightweight vehicles.
7.Application of hollow glass beads in buoyancy materials
Buoyancy material is a composite material with low density, high strength, hydrostatic external pressure resistance, Marine corrosion resistance and low water absorption rate, which is an essential basic material for modern ocean deep diving technology. With the increased diving depth, the pressure increases sharply, which puts forward higher requirements for the compressive strength of solid buoyant materials. With the improvement of compressive strength of foam buoyancy material, its density will gradually increase, and hollow glass beads, as a functional filling material with high compressive strength, low density and low water absorption, can replace foam foaming technology to prepare high-performance solid buoyancy materials with high compressive strength, low density and low water absorption.
Meng Mingfan et al. prepared the solid buoyancy material of hollow glass beads with 0.25g/cm3 hollow glass beads and bisphenol A epoxy resin E51 as the filling material. The buoyancy material's uniaxial compressive strength and hydrostatic pressure strength decrease gradually with the filling amount of hollow glass beads. When the filling amount of hollow glass beads exceeds 18%, the material properties are greatly reduced, and the buoyant material density is about 0.7g/cm3. When the amount of hollow glass beads exceeds 18%, the system's viscosity will increase, mainly caused by the increased air bubble content.
8. Hollow glass beads in the application of emulsion explosives
In the traditional emulsion explosive, chemical blowing agent and perlite are commonly used as density regulators; the chemical blowing agent makes the explosive density difficult to control and unstable storage, and perlite particle size is uneven, with high oil absorption value, and easy to make the explosive strength and oil resistance is limited. Hollow glass microbeads are an ideal sensitizer and density regulator for emulsified explosives of many types, uniform and controllable density and particle size, low oil absorption value, and stable chemical properties.
The difference between chemical sensitizers, perlite, and hollow glass microbeads on the stability of explosives and sensitizers were compared, and it was pointed out that chemical sensitizers could easily cause gas leakage and make explosives ineffective due to environmental changes. The porous honeycomb structure of perlite has a high oil absorption rate, which easily causes the oil film to break and makes the explosive lose its sensitivity. At the same time, the blasting test of perlite and hollow glass microbeads as sensitizers is carried out. The results show that under the same geological conditions, the consumption of emulsified explosives using hollow glass microbeads is 10% ~ 30% less than that of other emulsified explosives. After blasting, the smoke is small, the field of view is clear, and the blasting surface is more flat.
9. the application of hollow glass beads in electromagnetic shielding materials
Electromagnetic shielding materials play the role of absorbing waves ma, mainly magnetic microwave absorbers, which can be electromagnetic waves in the way of insulation loss, magnetic loss, and impedance loss into heat energy consumption, to play the role of electromagnetic shielding. The most common wave-absorbing agents are magnetic metal powder and ferrite; although these materials have excellent wave-absorbing properties, their high density makes it difficult to meet the lightweight requirements of modern wave-absorbing materials.
Guo Lingyan et al. pointed out that by electroless plating of nickel, silver, cobalt, and copper on the surface of hollow glass microbeads, low-cost, lightweight, and good absorbing properties of hollow glass microbeads can be prepared.
By electroless plating, Liu Hao prepared hollow glass beads/Fe-Ni alloy composite particles and core-shell composite particles coated with hollow glass beads/iron. Under the same conditions, core-shell composite particles have magnetic loss performance, but hollow glass beads/Fe-Ni alloy composite particles have the largest reflection loss (-33.8dB).
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