Amino silicone oil usually refers to silane coupling agent containing amino groups connected to the structure of organosiloxane polymer. Common coupling agents are 602 (N-β-(aminoethyl)-γ-aminopropyl methyl dimethoxy silane), 902 (γ-aminopropyl methyl diethoxy silane). By increasing the surface polarity through the side chain of ammonia, they improve the activity of modified silicone oil, greatly improve the water emulsification and fabric anchoring of silicone oil and improve the softness, detergency and emulsion stability of silicone oil.
Basic Synthesis Method:
Select 80% ethyl ethylene oxide and corresponding silane coupling agent for ring-opening polymerization under the action of alkali catalyst. Stable amino silicone oil is produced after equilibrium reaction.
Note: The reaction temperature should be determined according to the alkali catalyst type selected. If potassium hydroxide is used and the temperature is under control, the reaction at 130°C -140°C needs to neutralize silicon or acetic acid. If tetramethylammonium hydroxide is used, it needs to be controlled at 105 °C -115 °C. The reaction needs to be heated during the removal of catalyst at 135°C -145°C.
Application: The polarity strength of amino silicone oil is different according to its ammonia value. The higher the ammonia value is, the higher the polarity is and the better the emulsifying property is. The amount of emulsifying agent is smaller, and the emulsifying stability is good. Its anchor points have good adsorption to textile fabrics. The flexibility of silicone chain is more obvious in the hand feeling of fabric. If the ammonia value is low, more emulsifiers are needed to emulsify it. If the anchor points of fabric are few, the flexibility effect is not obvious, but the sliding effect of macromolecular silicone chain is pronounced. Amino silicone oil is mostly used in cellulose fiber fabrics, because polar groups are more conducive to the adsorption of amino groups on cellulose fibers. Chemical fiber fabrics have fewer polar groups on the surface, denser internal structure and higher crystallinity, so they need better polymers which are compatible with their structure and have finishing agents with better hydrophilic permeability so as to obtain better applications.