I、Usage

When CFS-534 is used as an additive, the amount of silane added is generally 0.5-3.0% of the formula amount, and the most suitable amount needs to be determined by experiment. This product is particularly suitable for applications where the environmental humidity is high. As with other silanes, CFS-534 can be prepared as an aqueous solution with a concentration of 0.1-1.0%, which is prepared by adding the product directly to deionized water with stirring. Stir continuously until the solution becomes clear and transparent. The surface of inorganic materials can be treated with aqueous silane solutions by spraying, coating or dipping. CFS-534 is also possible to mix the silane directly with the filler under high shear without adding any solvent. After the surface of the filler is treated with silane, it can be dried naturally or for a short time at 105°C to 120°C to complete the condensation of the silanol groups on the surface and remove methanol and water. The optimum addition amount, use and drying conditions (such as time and temperature, etc.) for each application are to be obtained by experiment. CFS-534 produces a small amount of low molecular alcohols during the reaction, which should be handled by considering a proper ventilation system during the production process.

II、 Solubility

CFS-534 is easily hydrolyzed and soluble in organic solvents such as isopropyl alcohol, acetone, toluene, xylene and mineral oil. Generally speaking, silane is soluble in many common organic solvents, but when using a specific solvent, the solubility and stability of silane in that solvent should be verified. 

III、Volatiles and active parts 

For silanes, most of the methods to detect volatile and active parts by measuring the change in mass of the substance at a set temperature, such as GB/T 1725-2007, ASTM#D2369, etc., are not applicable to the determination of silanes. Because alkoxysilanes tend to hydrolyze during the testing process, some of the more reactive silanes also hydrolyze with more other reaction tendencies. Once hydrolysis occurs, a large number of lower alcohols will be produced, which will affect the mass determination of low boiling point substances and make the test results seriously deviate from the actual situation. The most reliable method for determining the volatile and active parts of silicones is gas or liquid chromatography.

IV、Alkoxy Reactivity 

Silanes containing alkoxy groups have the typical chemical properties of alkoxy groups. Alkoxy silanes are prone to hydrolysis reactions in an environment containing water, resulting in silanol structures. Theoretically, silanol structures are prone to self-condensation reactions and are less stable, but silanols diluted to a certain concentration can have proper stability in polar solvents such as water or alcohol, and are more stable in weakly acidic systems. The silanol structure can undergo condensation reactions with the hydroxyl groups on the surface of the substrate, and the remaining silanol bonds can undergo condensation reactions with silanol bonds on other silane molecules or form hydrogen bonds. Through this combination of covalent and hydrogen bonds, the silane adheres to the surface of the substrate and thus acts as a surface modifier for the substrate. At the same time, other organic functional groups on the silane molecule maintain the chemical activity of the subsequent reaction.