Interaction Between Al‐δ Layered Sodium Disilicate and Surfactant

This paper investigated the interaction of Al‐δ‐Na 2 Si 2 O 5 with surfactants (LAS, AOS, K12 and AEO‐9) under condition approximating the detergent spray drying process. Al‐δ‐Na 2 Si 2 O 5 and the interaction samples were characterized by XRD, TG, FT‐IR and Ca 2+ ion binding capacity. The experimental results showed that Al‐δ‐Na 2 Si 2 O 5 might remain as δ phase after interacting with LAS. Al‐δ‐Na 2 Si 2 O 5 had changed to a mixed phase of δ phase and kanemite after interacting with K12 (or AEO‐9, AOS). LAS provides protection for the Al‐δ‐Na 2 Si 2 O 5 structure and K12 also provides protection to Al‐δ‐Na 2 Si 2 O 5 though it changed to a mixed phase when m H 2 O / m sur / m solid was equal to 2:1:3. The m sur / m δ was equal to 0.5, interaction time was 60 min, temperature was 60 ± 2°C and the relative crystallinity of the above samples were 28 and 26% higher than that of blank (the sample without surfactant under the same experimental conditions), respectively. AEO‐9 provided no obvious protection for the Al‐δ‐Na 2 Si 2 O 5 structure. AOS had destructive effect to the crystal structure of Al‐δ‐Na 2 Si 2 O 5 with δ phase relative crystallinity 10% lower than that of the blank under the same experiment condition.