AerosilR202 (SiO2)
AerosilR202 (SiO2)
CAS:
Molecular Formula: SiO2
AerosilR202 (SiO2) - Names and Identifiers
| Name | AerosilR202 (SiO2) |
| Synonyms | AerosilR202 (SiO2) |
AerosilR202 (SiO2) - Physico-chemical Properties
| Molecular Formula | SiO2 |
| Molar Mass | 60.08 |
| Melting Point | >1600℃ |
| Boling Point | 2230℃ |
| Appearance | White lens |
| Storage Condition | Room Temprature |
| Sensitive | Easily absorbing moisture |
| MDL | MFCD00011232 |
| Use | Use fumed silica can also improve the weather resistance and scratch resistance of the coating, and improve the bonding strength between the coating and the substrate. At the same time, fumed silica has strong ultraviolet absorption and infrared light reflection characteristics, which can improve the anti-aging performance of the coating when added to the coating. |
AerosilR202 (SiO2) - Introduction
It has interesting thickening, thixotropy and huge external area.
Last Update：2022-10-16 17:30:54
AerosilR202 (SiO2) - Uses and synthesis methods
ratio and system properties
The fumed silica is added to the coating as an auxiliary agent, and there is the best addition amount. If the addition amount is insufficient, it will not have the expected effect. However, too much addition is not only a waste, but also may have side effects, which will reduce the quality of coating products. To give full play to the function of fumed silica, it is necessary to fully understand the coating formula, analyze which raw materials will hinder or promote the function of fumed silica, and select the best addition amount. Usually raw materials with multiple hydrogen bonds can improve their efficiency. In addition, the PH value of the aqueous system has a great influence on the function of fumed silica. When the PH is between 7.5 and 8.5, unless additives are added, fumed silica will not effectively play its role. When the PH value is greater than 10.8, fumed silica will dissolve in water.
action
The specific surface area of fumed silica is large, the surface energy is high, and it is very easy to agglomerate. It must be properly dispersed during the application process to obtain the most effective effect. In the coating production process, the surface treatment, addition method, and selection of dispersion equipment of fumed silica affect the dispersion state of fumed silica in the coating. If the dispersion is insufficient, the three-dimensional network structure cannot be fully formed, and excessive dispersion can only form a small part of the network. Similar to other thickeners, the ratio of the slurry during dispersion directly determines the dispersion efficiency, and only the appropriate ratio can be completely dispersed; the addition order also affects the dispersion efficiency. In general, it is best to first disperse the white carbon black into a pre-slurry, and then put into the powder dispersion fineness. If white carbon black and powder are fed and dispersed together at the same time, the dispersion efficiency will be reduced and the thickening and anti-settling effects of white carbon black will be directly affected.
Last Update：2024-04-09 01:59:50
