Abstract
Polyurethane is a polymer adaptable to different scientific and industrial requirements; nevertheless it is also extremely susceptible to UV radiation, which compromises the physical and mechanical functionality. In this framework, our study investigated the effect of waterborne polyurethane dispersion (WPUD) applied to a polyester (PET)-based fabric, through the impregnation method, on the puncturing and water resistance of the pristine material, before and after UV weathering. Results confirmed an increment of both features in the prepared fabrics, attributed to the PUR textile treatment; but a partially loss of the gained properties in the samples due to the UV weathering. In order to improve the efficiency of the impregnating dispersions, in protecting the durability of the treated materials, the addition of different UV light stabilizers, or/and of crosslinking agent into WPUD was also tested. From the experimental data, it can be concluded that formulations based on WPUD, containing both the crosslinker and UV organic absorber, have displayed an increment of their perforation and water resistance for the treated samples with respect to the starting textile, and contemporary have preserved the features against the UV light. Finally, microscopic and spectroscopic analyses have been performed as further characterization techniques of the samples surface.
Highlights
IntroductionPolyurethanes (PURs) are a class of polymers (thermoplastic or thermosetting) obtained by a chemical reaction between aliphatic or aromatic isocyanate groups (R-(N=C=O)n ) with polyols (R0 -(OH)n ), mainly polyester or polyether-based
Polyurethanes (PURs) are a class of polymers obtained by a chemical reaction between aliphatic or aromatic isocyanate groups (R-(N=C=O)n ) with polyols (R0 -(OH)n ), mainly polyester or polyether-based
It can be concluded that formulations based on waterborne polyurethane dispersion (WPUD), containing both the crosslinker and UV organic absorber, have displayed an increment of their perforation and water resistance for the treated samples with respect to the starting textile, and contemporary have preserved the features against the UV light
Summary
Polyurethanes (PURs) are a class of polymers (thermoplastic or thermosetting) obtained by a chemical reaction between aliphatic or aromatic isocyanate groups (R-(N=C=O)n ) with polyols (R0 -(OH)n ), mainly polyester or polyether-based. PURs are the mostly used polymers in the textile coating industry because they may be made strong and rigid or soft and elastic by varying their chemical structures They possesses good washproofness and cleaning resistance, good adhesion to fabrics, good chemical and abrasion resistance, along with a pleasurable and soft to the touch surface. The production of traditional PUR polymers is based on petroleum, as the main raw material, and this implies the adverse emission of volatile organic compounds (VOC) and other harmful substances.
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