我們利用噴霧塗佈加工的方式將PU塗佈在棉布或聚酯(PET)織品，旨在將原本具有親水性的棉布或PET織品表片呈現具疏水或疏油性質。塗佈加工過程是首先將聚胺酯(PU)預聚物、含氟化聚胺酯(PU)預聚物、含聚二甲基矽氧烷(PDMS)PU預聚物一定比例混掺，並以溶劑稀釋5％至3％噴霧塗佈在棉布或PET織品上之後，其含有氟素、矽氧烷基的PU預聚物會在織品表面上，利用常溫濕氣硬化反應，形成化學鍵結的互穿式網狀交聯(IPN)系統，崁入織物纖維之間，其高度架橋PU樹脂使其固定在織物纖維間，進而提高其耐水洗性。濕氣交聯型PU在最適加工條件下，經撥水加工後的織物其對水的接觸角超過140°，且經過50次洗滌後仍能維持其原有的撥水效果。 A moisture-curable NCO-terminated polyurethane (PU) prepolymers and fluoro- or polydimethylsiloxane (PDMS) containing PU oligomers are synthesized, respectively. The coating materials are obtained by blending of these PU oligomers and PU prepolymers, in different ratios. These coating materials are spray coated onto cotton and polyethylene terephthalate (PET) textiles of 5％ to 0.5％, aiming for hydrophobic surface of textiles. The spray coating on textile surface by blending of these PU prepolymer, fluorinated PU prepolymer or/and PDMS PU oligoemers, an inter-penetrating polymeric network (IPN) system will be resulted and anchored into on textile fibers upon drying and moisture-curing raction at ambient temperature. The resulted IPN coating system with highly cross-linked polymer anchored into fabric fibers that enhance water washing durability of treated textiles. The treated textile surface with fluoro- or/PDMS containing PU system that demonstrates the long lasting water repellency characters. A moisture-curable NCO-terminated polyurethane with the optimum coating treatment, the contact angle of textile could reach over 140° and remain the efficiency after 50 washing cycles.
