| Amino-silicone oil is widely used in after-finishing of various kinds of textile because of its excellent smoothness, softness and film forming characteristics. But in the application process the finished textile become water resistant and have yellowed phenomenon when treated at high temperature. So its application is limited. In this paper, common amino silicone oil is quaternary ammonium modified with epoxypropyl dodecyl dimethyl quaternary ammonium salt. Compared with the common amino-silicon oil the hydrophilicity and the whiteness of the fabric finished by the new quaternary ammonium modified amino-silicone are significantly improved while the good feeling remained.Epoxypropyl dodecyl dimethyl quaternary ammonium salt is synthesised by N, N-dimethyl dodecylamine and epoxy chloropropane. The epoxy value and the percent conversion are measured. The Epoxy value is 0.28 and the percent of conversion is 96% under the ultimately determined reaction conditions.The major raw materials used to synthesize amino-siloxane oil include N-(β-aminoethyl)-y-aminopropylmethylbimethoxy silane, hexamethyldisiloxane and octamethylcyclotetrasiloxane. Tetramethylammonium hydroxide is applied as alkaline catalyst in the bulk copolymerization. By adjusting the dosage of the coupling agent and the blocking agent, products with a series of amine value and viscosity are obtained.The amine value range at 0.90-1.00 mmol/g is choosed for the ring-opening reaction. In the solvent of isopropanol, primary amine of the amino silicone oil react with epoxy group of the epoxypropyl dodecyl dimethyl quaternary ammonium salt. Varying modification degrees are obtained by adjusting the proportion of primary amine and epoxy group. Not only the numbers of active hydrogen atoms are reduced, but also the hydrophilic groups are brought in, so the hydrophobic softener is changed into a hydrophilic one. Meanwhile, the new production has low yellowing character. The structure of the product is inspected and verified by analyzing the elemental analysis, infra-red spectrum and 1H-NMR spectra. In the study of the emulsifying rules, emulsifying agents and the complex of emulsifying agents were optimized based on the theory of hydrophilic-lipophilic balance. Different emulsifying agents, pH and the dosage of the emulsifiers were discussed. With blue light, transparent silicone softener emulsion was prepared. After evaluating the Transmittance and its average particle size, it is found that the emulsions before and after modification are both stable. At the same time, the emulsion after quaternary ammonium modification can be emulsified without emulsifying agents, so the dosage of emulsifying agents have been greatly reduced.The amino-modified silicone oil and quaternary ammonium modified amino-silicone oil emulsions are finished on cotton fabrics. The whiteness, breaking strength, tearing strength, hydrophilic and 11 KES parameters of the fabrics were analyzed. The test results showed that the fabrics finished with modified amino silicone oil emulsion have lower yellowing phenomenon, and higher hydrophilicity. When the emulsion is finished on cotton fabrics, the antimicrobial and the persistence of the sample were also studied in this thesis. The study shows the organ silicon antimicrobial can effectively destroy Escherichia coli, which also has a good persistence after series of bath. Simultaneously, the quaternary ammonium modified amino-silicone oil emulsion is also used in polyester fabric. The hydrophilicity is increased and the finished fabrics show good anti-static performance including electrostatic pressure and half decay time. Because of its excellent performance in softness, anti-yellowing and hydrophilic, the new modified softener will have good foreground in the future.
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