废PET降解制备Gemini表面活性剂

对废PET进行乙二醇降解，以醋酸锌作为催化剂，在N2保护下，降解为对苯二甲酸乙二醇酯（BHET），作为Gemini的连接基团。以马来酸酐、烷基醇（C8～C18）、亚硫酸氢钠为原料合成单链磺酸盐表面活性剂。纯化的BHET链接两个单链磺酸盐表面活性刺从而合成了新颖的多酯基Gemini表面活性剂。并对其性能进行了测定，表面张力为σ（γCMC）31．2mN／m，CMC值为0．95×10^-4mol／L，具有较低的CMC值和较高的表面活性。这样不仅保护了环境，而且变废为宝，实现了PET的循环利用。

Recycling of Waste PET into Gemini Surfactant

The waste PET was depolymerized using ethylene glycol in the presence of zinc acetate as a transesterification catalyst under nitrogen atmosphere, and obtained monomer bis （2-hydroxyethylene terephthalate） （BHET）, as the Gemini connect group. The single chain sulfonate surfactant was synthesized with maleic anhydride, long chain alcohol （C8-C18）and sodium bisulfite. The pured BHET then link the the single chain sulfonate surfaetant and obtained a new Gemini surfactant. Finally, the surface tension of Gemini was investigated. The surface tension was 31.2mN/m, and the CMC was 0.95×10^-4mol/L, with a more lower CMC value and a more higher tensiometric property. Then, we reuse the waste PET into Gemini surfactant, at the same time protect the environment.