Naphthalene sulfonate formaldehyde Condensate (FDN) is an anionic surfactant with water-phobic structure composed of methylene connected ban ring and water-philic structure with sulfonic acid group. It is widely used as water-reducing agent for concrete, dye dispersant and coal water slurry dispersant because of its mature synthetic process and excellent dispersant performance. FDN is prepared from industrial naphthalene by sulfonation, hydrolysis, condensation and neutralization with concentrated sulfuric acid.
In recent years, with the price of industrial naphthalene, which takes petroleum and coal as raw materials, rising, it brings high cost to the production of FDN. It is of economic significance to further improve the properties of FDN by physical and chemical modification or to find new materials to replace industrial naphthalene to synthesize FDN to reduce the production cost. CAS:36290-04-7
Naphthalene Sulfonate is currently synthesized as the FDN product Condensate has at the same time provide molecular aggregation degree, broad molecular weight distribution and other characteristics, to meet the needs of engineering application, this paper, by means of physical methods ultrafiltration will FDN according to molecular weight (also known as degree of polymerization) has carried on the classification, by mass spectrometry, elemental analyzer characterization of the structure characteristics of the different molecular level of FDN, and studied the different FDN on molecular level In order to get better dispersion performance of FDN grade. Sulfonated Naphthalene Condensate/ Sodium Salt.
In order to explore the difference of different molecular weight parts of FDN in cement dispersion application performance, this paper studied the adsorption behavior of FDN on the surface of cement particles, including electrokinetic potential, adsorption capacity, adsorption layer thickness, and by means of molecular self-assembly, obtained the influence of molecular weight, inorganic salts and hydrogen bond force on THE adsorption of FDN. In addition.
Post time: May-31-2022