Study On Amino Silicone Oil Synthesis And The Relationship Between Its Structure And Performance

Amino-silicone oil has many advantages such as reactivity, lubricity and flexibility due to the amino groups attached on the molecular, so it is widely used in softener, brightener and resin modifier manufacturing areas. This paper researched on the relationship between amino-silicone oil's structure and its corresponding performance. And we prepared amino-silicone oil from α,ω dihy-droxypoiydimethylsioxane and N-β-aminoethyl-γ-aminopropylmethydimethyoxysilane under alkaline catalysts. We used "~1H-NMR tracking method" to follow the synthesis process of amino-silicone oil and this method gives us qualitative and quantitative analysis of the products after different reaction times. By analyzing chemical shift of H atoms on methoxyl group and integral area of ~1H-NMR graphs, we achieved the relationship between chemical structures, reactants' concentration and conversion. This paper also presented a new method to control molecular weight, which is controlling the amount of alkaline catalysts. The expected amino-silicone oil is obtained better when the concentration of the alkaline catalyst, reaction temperature and reaction time are 5%, 363 K and 300 min respectively.Two nonionic surfactants, AEO-3 and TX-10, had been used in our experiments as emulsifier to prepare amino-silicone oil emulsion. Under experiment conditions, the suitable HLB value of the compound emulsifier for this amino-silicone oil is 10.5 ± 0.5. When stirring rate was 300 r/min, stirring time was 60 mins and under 40℃ circumstances, by adding 6.41% of emulsifier and 3.85% amino-silicone oil into the system, we could obtain the best emulsifying condition by simple mechanical stirring.We studied the relationship between amino-silicone oil's structure and its corresponding performance systematically. The results showed that when amino groups in the middle of the macro molecular chain, the emulsion prepared had better softening ability then that of amino groups at the ends of macro molecular chain.Besides, different neutralization extents of the amino-silicone oil emulsion have different effects on softness. For 50% neutralization, the prepared emulsion gives us a better softness. Further more, other factors such as amine equivalence, molecular weight and softener concentration may affect the performance. For cotton textiles, we found when amine equivalence, molecular weight and softener concentration are 0.6mmol/g, 130,000 and 3.15% respectively, it shows best ssoftning performance; while for silk fabrics, those numbers should be 0.33mmol/g, 50,000 and 1.83% respectively.