High strength hollow glass microspheres with diameter no more than 1 mm are attractive for hydrogen storage and transport. Microspheres were made by drop tower techniques with 150-250 μm diameter and 0.9-4.0 μm membrane thickness . By immersion in high pressure hydrogen for a period of time at an elevated temperature the microspheres could bu filled with hydrogen. The hydrogen pressure was equal to that of gas-filled chamber at 350℃ for 6-10 h. With the help of Fick’s first law and the ideal gas law the pressure in the microspheres could be calculated. Based on the Arrhenius expression, permeability conefficient decreased as temperature dropped. The half-life time for hydrogen retention in hollow glass microspheres was about 40-50 d at room temperature. The maximun hydrogen pressure could reach 20-25 MPa in the hollow glass microspheres with 200 μm diameter and 2 μm membrane thickness. The hydrogen mass fraction was 13% to 16%.
Titanium doped hollow glass microsphere preparation process
Sol-gel technology is metal organic or inorganic compound as precursor, uniform and hydrolysis under liquid phase polycondensation reaction, after solution, sol and gel and curing, after heat treatment and the technological process of the solid oxide or other compounds.Sol-gel technology provides a low temperature chemical new ways of cutting and control in the microstructure of the material. Tell from the principle of doping, titanium doped glass sol – gel titanium doped glass – titanium doped dry gel particles – titanium doped hollow glass microspheres in furnace pelletization process each link of uniform doping control technology properly, can realize Ti – the titanium HGM uniform doping.
Doped Ti hollow glass microspheres prepared in the furnace
Doped Ti of hollow glass microspheres pelletization process inside the furnace is in a composite of high temperature oven dry gel microsphere was prepared. Doped titanium dry gel particles from the feed zone into free fall after high temperature, in turn after absorption of heat, encapsulation, foaming, refining, cooling process, the final settlement in the collection the collection vessel.
After 2000 , the abroad and targeted has carried on the related technology development, further broaden the hollow glass microballoon application in the field of high-end products, such as the United States of F117A stealth aircraft has adopted the carbonyl ferrite single core ball; Use the narrow heart glass microballoon filled polymer synthesis of deep-sea high buoyancy material has been applied in submarine.
Production status at home and abroad
Internationally leading technology and the ability to mass production and operation of hollow glass microspheres famous enterprises: American Potters Company, 3M Company, Emerson & Cuming Company, the Belgian company Glaverbel, Pittsburgh Corning Company, Philadephia Quartz Company.
The fly ash hollow glass microspheres franchise businesses have Hargreaves PFA Marketing Ltd, most notably the United States and Belgium Potters company Glaverbel company, they can be mass production of hollow glass beads, high refractive index glass beads and solid beading and so many different series, uses beads products, annual production of 100,000 t or more.Japan, the largest output in Asia, but the Japanese domestic demand for large hollow glass microspheres, still need to import large quantities each year. After 20 years of efforts of scientific research personnel, research and development of hollow glass microspheres has been some progress.
Steel Horse Mine Hospital developed high-performance hollow glass microspheres product has been fully put on the market.
Proportioning cost, because of the large dosage of hollow glass beads are relatively high, can be recycled to become important factors restricting the popularization and application of the glass beads drilling fluid can, and only when the beads for 50 ~ 100%, the recovery of hollow glass microsphere, the cost of drilling fluid can with the cost of conventional water-base drilling fluid.
Belonged to non-newtonian fluid, drilling fluid for non-newtonian fluid, the sedimentation rate related to the rheology, has nothing to do with the density difference between the medium. Based on this principle: recycling glass microsphere, especially in the water-base fluid recycling glass beads, water damage fluid rheological property can be used qualitative methods.In essence, is the drilling fluid from the Newton fluid into the Newtonian fluid. A series of data show that recovery rate and final reduced with increase with the increase of the amount of dilution. This method is applicable at the scene, only will be separated from the solids control equipment of the drilling fluid and completion fluid discharge to prepare a good pool, and then add plenty of water, good beads will be floating on the surface of the water.
Reflective powder Uses
Reflective powder is a production of reflective fabric, reflective film, reflective paint, reflective signs, promotional materials, clothing materials, standards stadium runway, shoes, hats, bags, land and air rescue supplies and other new light functional composites core materials.It has a return-reflective properties and the resulting strong retroreflective effect, no external power supply, can be widely used in roads, ports, mining, fire and other fields. As a security mark, greatly improved the safety and reliability of the user.
Since the thermal conductivity is extremely small, used for various insulation plastic filler; for example lighter components can be used to prepare;It can enhance or improve the water resistance, compressive strength and impact strength; very high specific resistance, and low water absorption, it can be widely used in processing the production of cable insulation material; the low porosity and specific surface area, the beads absorb resin small, so even if a lot of filling, viscosity is not high, good processing properties, processing can reduce power consumption, help to improve productivity;Products have good anti-cracking performance; low oil absorption, especially for soft PVC products production, processing, reduce the amount of plasticizer, or for products containing PTFE piston rings and other special products; product size and stability, due to the micro Pearl isotropic orientation caused not generated in different parts of the problem of inconsistent shrinkage, warping, resolves profile, large injection molding process long-standing problem of distortion;With special optical properties, it can be used as a filler for plastics reflective, luminous paint and the like; products are easy to handle after such as drilling, cutting and polishing and so on. These advantages can be reflected in the molding of the finished product is completed.
Problems with the production of raw materials, grading and other issues, promote the use of hollow glass microspheres speed in the plastics industry has gradually accelerated, and will become the new century plastics industry fillers star.
Based on the world with innovative strength. Mine is not the first hospital started to develop hollow glass beads business, but the difference lies in the “high performance.” “There are a lot of glass beads on the market now, but its quality and performance, there are gaps.
“Our aim is the world’s leading-edge technology, the world’s leading-edge products, we use the most advanced hollow glass microsphere material pioneered a new strategic service China, again the global launch of China’s high-performance hollow glass beads products, let the world know China’s as good as the product. “Xu Chuanhua”said. In order to continue to stabilize, market, Xuchuan Hua and his research group is still on the product for further development: Continue to improve the product line, and continuously improve product quality, efforts to extend the industrial chain, because “Innovation is endless.”
This article comes from the Ma On Shan Government Portal
Little beads but full tech, which embodies the wisdom and sweat is unable to use a digital measurement. It is a number of research institutes and research who uphold the conviction of most like performance.
What is a high-performance hollow glass beads? What are its unique properties? What areas can be applied?
The most convincing examples should be known as “dragon” was. June 27, 2012, Chinese “dragon” to achieve maximum dive depth of 7062.68 meters, creating a new record for China’s manned dive. The ship shell looks very thick “monster”, the weight in air is not more than 22 tons, it is made of hollow glass microspheres and an epoxy resin composition. Moreover, due to the characteristics of hollow glass microspheres have both thermal insulation, but also has sound-absorbing function, which often become the first choice of large aircraft weight loss. As in hollow glass beads coated with a nickel-cobalt and other metals, not only can reduce the weight of the aircraft, more absorbing stealth.
Hollow glass microspheres Application Features:
There filling performance energy efficient, low low oil, density, added 5% (wt) will be able to make the finished product increased by 25% to 35%, so as not to increase or even reduce the cost per unit volume of the coating. Hollow glass beads particles confined hollow spheres added to the coating formation of many independent microscopic cavity insulation, thus greatly improving the coating on the thermal and sound insulation, play a very good thermal insulation and noise reduction effect. The coating has a more waterproof, anti-fouling, corrosion resistance. When the surface of the hollow glass microspheres are chemically inert chemical resistance, as the film tightly packed particles of glass beads, the formation of low porosity, the coating formed on the surface of the moisture and corrosion caused by the blocking effect of ions protective film, played well protective effect.
Hollow glass beads spherical structure makes the impact force and stress have a good dispersion, added to the paint can well improve the resistance to external impact properties of the film, and the coating can be reduced due to thermal expansion and contraction the stress cracking.
At home and abroad choose carved hollow glass beads from fly ash can be divided into two methods. First, the use of dry mechanical sorting cenospheres; two is wet sorting hollow glass beads. Specifically using the method according to the actual situation.
In China, the use of sorting dry mechanical method, there is gravity separation Sieve Series sorting equipment hollow glass microspheres, can handle daily 30t ash. The sorting process includes a reference to the election cenospheres, and can choose the iron, the election of carbon, as well as a variety of hollow glass microspheres particle size classification.
Hollow glass beads sorting device consists of three main parts, namely sorting, splitters, collector.
