Hollow glass microsphere is a kind of small size hollow glass sphere, belongs to inorganic non-metallic material. Typical particle size range of 10-180 microns, bulk density 0.1-0.25 grams/cubic centimeter, with lightweight, low thermal conductivity, sound insulation, high dispersion, electrical insulation and thermal stability and other advantages, is gradually developed as a wide range of applications, excellent performance of the new light material.
Common preparation method of hollow glass microspheres
1. Glass powder method
The glass powder method uses pre-prepared glass powder containing gases such as SO3 to pass through the flame at the temperature of 1100-1500℃. At this time, SO3 and other gases dissolved in the glass powder overflow from the inside of the glass due to the decrease in solubility and the change in the atmosphere of the kiln. At the same time, the glass powder becomes spherical under high temperature due to the surface tension. The spillage gas is sealed in the spherical particles to form hollow glass microsphere.
Advantages: can design a variety of glass systems, product types, high quality, suitable for high-performance hollow glass microsphere;
Disadvantages: hollow glass microsphere low yield, high cost.
2. Spray granulation method
Spray granulation method is made in advance with special auxiliary reagent (boric acid, urea, ammonium pentaborate) aqueous solution of sodium silicate, and then through the nozzle to the solution injection into the spray dryer, is expected to drop after drying to get a certain particle size of powder particles, the final will be powder particle heating foam-forming hollow glass microsphere. The United States 3M company is the first to use this process to produce hollow glass microsphere, because of the process in the product chemical stability and homogeneity and other aspects of the deficiency, people through the study of adding metal oxides with a low melting point, high viscosity, high surface tension trend, in order to improve the performance of hollow glass microsphere. China's current market sales of hollow glass advantages: hollow rate is high, relatively low cost;
Disadvantages: the physical and mechanical properties, especially the compressive strength properties are much lower than the hollow glass microsphere produced by the glass powder method.
3. The droplet method
The liquid drop method adopts the same raw materials as the spray granulation method. The raw materials are 500 copies of sodium silicate (M (SiO2): M (Na2O) =2), and the same amount of 10% ammonium perborate aqueous solution is added. After mixing evenly, the hollow glass microsphere are sprayed into the spray drying tower. Glass microsphere are produced in this way.
4. Dry gel method
The alkyl salt was added to dilute hydrochloric acid and decompose with water. After gelation, the gel was dried in two stages at 60℃ and 150℃ and then crushed by a ball mill. After grading, the dried gel powder was obtained, which was foamed in a vertical electric furnace at 1280℃ to prepare hollow glass microspheres.
Hollow glass microsphere supplier
As a global Hollow glass microsphere supplier, Tanki New Materials Co.Ltd has rich experiences in the properties, applications, and cost-effective manufacturing of advanced and engineered materials. Tanki New Materials Co.Ltd Aims to help All industries and Chemical Wholesalers to find high-quality, cheap price Nanomaterials and chemicals by providing turn-key customize manufacturing services. If you are looking for Hollow glass microsphere, please feel free to send an inquiry for the latest Hollow glass microsphere price.
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