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September 27, 2022
Hollow glass microspheres is pure white powders, which is hollow and transparent spheres under the microscope, hollow and contain thin air. The main component is borosilicate. It is an inorganic non-metallic material.
Due to its hollow characteristics, compared with ordinary glass beads, it has the advantages of light weight, low thermal conductivity, sound insulation, high dispersion, good electrical insulation and thermal stability. Usually the particle size range is 10-180 microns and the bulk density is 0.10-0.62 g/cm3. The highest compressive strength is 3000 PSI, and the thermal conductivity is 0.038-0.085w/m.k. It is a new lightweight material with a wide range of uses and excellent performance.
Main characteristics of hollow glass microspheres
1. Hollow Glass Microspheres have a scattering effect on light in the full visible spectrum
The glass material is actually colorless and transparent, but because the glass beads have a scattering effect on the light in the full visible spectrum, the color appears to be white. But when it is added to a colored material, it scatters the light of the material color, so it can be widely used in any material that has requirements on the appearance color without affecting the original material color.
2.The density of hollow glass microspheres is low.
The density of hollow glass microspheres is 0.12-1.60 g/cm3, about one tenth of the density of traditional filler particles. After filling, the basis weight of the product can be greatly reduced, and the larger volume enables it to replace a large amount of Other raw materials reduce product cost.
3. High dispersion and good liquidity.
Since hollow glass microspheres are tiny spheres, they have better fluidity in liquid resins than flake, needle or irregular fillers, so they have excellent mold filling performance. More importantly, the small microspheres are isotropic, so there is no disadvantage of inconsistent shrinkage rates in different parts due to orientation, which ensures the dimensional stability of the product and will not warp.
4. Heat insulation, sound insulation, insulation and low water absorption.
The inside of hollow glass microspheres is a thin gas, so it has the characteristics of sound insulation and heat insulation, and it is an excellent filler for various thermal insulation and sound insulation products. The insulating properties of hollow glass microspheres can also be used to protect products from thermal shock caused by alternating between rapid heating and rapid cooling conditions. High specific resistance and extremely low water absorption make it widely used in the production of cable insulation materials.
5. Low oil absorption rate.
The particle size of the sphere determines that it has the smallest specific surface area and low oil absorption rate, and the amount of resin can be greatly reduced during use. Increase production efficiency by 10% to 20%.
The application of hollow glass microspheres
1. Low density drilling fluid and cementing cement
Application of Hollow Glass Sphere in Low Density Drilling Fluid and Cementing Slurry
Because of low density and high compressive strength, Hollow Glass Sphere is very suitable in preparing low-density drilling fluids. It is widely used in deep oil wells to keep the constant stability of the density of drilling fluids;
Round spherical shape, very good fluidity, perfect lubrication function, these characteristics of Hollow Glass Sphere can reduce friction during drilling process, extend the service life of drill pipes and drill bits, and greatly improve drilling effect as well as drilling performance;
The low-density and high-strength slurry system prepared by Hollow Glass Sphere is one of the main ways to resolve the low pressure and the loss of cementing slurry which is easy to leak.
2. Thermal insulation coatings and marine anti-corrosion coatings
The hollow glass microspheres can be directly added to the coating system in the form of filler, so that the coating film formed by curing the coating has thermal insulation properties.
As a coating filler, it also has the following advantages: efficient filling, low oil absorption, low density, adding 5% (weight percentage) can increase the finished product by 25% to 35% (volume or coating area percentage), Thereby reducing the unit volume cost of the coating.
The surface of glass microspheres is more resistant to chemical corrosion and has a reflective effect on light. Therefore, the paint coating is anti-fouling, anti-corrosion, anti-UV, anti-yellowing and anti-scratch. Hollow glass microspheres are closed hollow spheres, which are added into the coating to form many microscopic independent thermal insulation cavities, thereby greatly improving the insulation of the coating film against heat and sound, and playing a good role in heat insulation and noise reduction. Make the coating more waterproof, anti-fouling and anti-corrosion properties.
The chemically inert surface of the microspheres is resistant to chemical corrosion. When the film is formed, the particles of the glass microspheres are closely arranged to form a low porosity, so that the coating surface forms a protective film that has a blocking effect on moisture and corrosive ions, which plays a good role in protection
Hollow glass microspheres are commonly used widely used in various advanced lubricating oils, high temperature insulating paints, high wear-resistant and anti-corrosion paints, advanced furniture paints, ship rust anti-corrosion paints, automotive advanced paints, exterior paints for various mechanical equipment , interior and exterior wall coatings for buildings, etc.
3. Modified plastics
Hollow glass microspheres for filling of ultra-high molecular weight polyethylene materials
It not only acts as a solid lubricant to improve processing fluidity, but also can modify the comprehensive mechanical properties of ultra-high molecular weight polyethylene materials to improve its strength and wear resistance. The tensile strength, impact strength, hardness and other mechanical properties of nylon with hollow glass microspheres are improved, and it can prevent material aging caused by light and heat.
Filling rigid PVC with hollow glass microspheres to produce profiles, pipes and sheets can make the material have good dimensional stability, improve rigidity and heat-resistant temperature, and improve production efficiency; filling with ABS can improve the dimensional stability of the material , reduce shrinkage, increase compressive strength and flexural modulus, and improve surface paint performance.
Hollow glass beads are widely used in lightweight vehicles, such as car dashboards, car door trims, car door guards, car bumpers, passenger car seats, and engine covers.
The common adhesive filler, heavy calcium carbonate, has a density of 2.8g/ml, and the density of hollow glass beads is very low. Only a small amount of mass (1%-2% by mass) can be added to reduce the cost. Hollow glass beads are used as adhesive additives, which can improve the chemical resistance of adhesives, reduce shrinkage and warpage, reduce resin consumption, and reduce VOC.
5. Emulsion Explosives
In the early stage of emulsion explosives, the commonly used density regulators are expanded perlite and chemical foaming agents. Such explosives are easily limited by their particle size, strength and oil resistance, and have low explosive performance, short storage period, and difficult explosive density. control issues.
The introduction of hollow glass microbeads in the emulsion explosive overcomes the above shortcomings, greatly improves the detonation performance of the explosive and significantly improves the storage stability. Its main feature is the use of the sensitization effect of hollow glass microspheres. It can significantly improve the detonation performance of emulsion explosives and prolong the storage period.
6. Marine solid buoyancy materials
The density of hollow glass beads can be adjusted to better adjust the specific gravity of buoyant materials, the volume filling rate is higher, and the water absorption rate is reduced. Commonly used marine solid buoyancy materials, such as offshore platforms, offshore oil pipeline systems: oil transportation, exploration pipelines, deep sea carrying equipment, underwater engineering testing instruments, etc.
Hollow glass microspheres is also used for rubber and plastic elasyomers and 5G communications...
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