Short-Branched Fluorinated Polyurethane Coating Exhibiting Good Comprehensive Performance and Potential UV Degradation in Leather Waterproofing Modification

Abstract

In the current leather market, waterproof leather occupies a large proportion, where waterproofness has become one of the important standards for leather selection. However, the most advanced fluorine-containing waterproofing agents on the market always have long chains of over eight carbons (C8), whose use has been restricted due to their bioaccumulation and recalcitrance in natural environment. Consequently, creating waterproof materials characterized by their environmentally friendly qualities and high performance is of great significance. Herein, we report a novel strategy for preparation of the fluorinated polyurethanes containing short branched fluorocarbon chains, and apply it in leather waterproofing. Because the fluorine-containing chain segments are enriched on the coating surface, the waterproof agent coating shows good hydrophobicity, low water absorption, high wear resistance and potential photodegradation of performances. Additionally, the water and oil proof performances of the coating are comparable to that of the marketed C8 waterproofing agent. Its solvent-resistant and antifouling performances are also outstanding. Therefore, the coating can meet the property requirements for daily use and has broad application prospects.

Study on Modification and Application of Functional Polyurethane in Leather Finishing

“…The branched structure of the synthesized HBPU is more effective at blocking water in the molecule than UT-200, which has an unreacted active group. Su et al [19] synthesized a PU emulsion containing short branched fluorocarbon chains and coated it onto the leather surface. The surface of the coating is enriched with fluorine chain segments, showing good hydrophobicity, high wear resistance and good mechanical ability.…”

Imparting Waterproofing Properties to Leather by Polymer Nanoemulsion Based on Long-Chain Alkyl Acrylate

“…Many chemicals have been developed as waterproof fatliquors, such as alkenyl succinic acid, chromium soaps, polysiloxanes, organic fluorine compounds, and amphiphilic polymeric fatliquors [ 5 , 6 , 7 ]. Among these chemicals, amphiphilic polymeric fatliquors have become a research hot spot due to their ability to integrate the retanning and fatliquoring process and shorten the processing time [ 8 , 9 , 10 ].…”

Preparation of modified CO2‐based polyurethane for wet‐type artificial leather with excellent alkali resistance

“…8,9 WPL is widely used in clothing, footwear, automobile decoration, office furniture and other fields. [10][11][12][13] PPCD synthesized from CO 2 and propylene oxide is a low molecular weight diol with the hydroxyl groups at the ends of its chains, which is one of the most widely used CO 2 -based oligomer. 14 Polyurethane prepared with PPCD as the soft segment has the mechanical properties of polyester-based polyurethane and the water resistance of polyether-based polyurethane due to the flexibility of ether bonds and the intermolecular force of polar carbonyl groups.…”