The effect of acrylate on structure and properties of waterborne polyurethane porous coated fabrics

Abstract

Porous-coated fabrics used for synthetic leather were prepared by mechanical foaming method using blends of waterborne polyurethanes (WPUs) and polyacrylate (AC). The effect of AC on structure and properties of WPU/AC coated fabrics was investigated. Fourier transform infrared spectroscopy and differential scanning calorimetry results indicated that there is hydrogen bonding between WPU and AC and the compatibility of the blend system gets worse after AC/WPU ratio is higher than 30/70. Thermogravimetric analysis demonstrated that the thermal stability of porous coatings is improved with increasing AC. Scanning electron microscopy images showed that porous coatings have semi-open cellular structure with a great number of surface pores and window pores, imparting excellent air permeability and water vapor permeability to coated fabrics. On the basis of morphology analysis, the forming process of cell structure of WPU/AC coated fabrics was proposed. Performance tests showed that the overall performance of coated fabrics is best with AC/WPU ratio ranging from 15/85 to 30/70.

Polyurethane: Recent Engineering Contributions

“…The H bonds between the polymers were proved by FTIR and DSC. The best performance of coated fabrics was found at the ratios from 15/85 to 30/70 polyacrylate /PU [34]. Novel PU coatings were produced by polycondensation of hydroxylationterminated poly (L-lactide) (PLLA) functionalized graphene (G-g-PLLA) and isocyanate terminated PU oligomer with dimethylsiloxane.…”

Sustainable and greener coatings produced from accelerator‐ and sulfur‐free polyurethane dispersion/carboxylated nitrile butadiene latex blends

“…10,11 Polymer blending has long been recognized as a costeffective method for achieving the desired final properties of the polymers resulting from the synergistic effect of the component polymers in the blending system. 12,13 Some efforts have been made to blend PUD (as a major or minor phase) with other polymeric materials, for example, casein-caprolactam, 14 soy protein derivatives, [15][16][17] kefiran, 18 polyethylene oxide, 19 polyacrylate, 20 and sodium alginate. 21 The PUD blending demonstrated improvements in selected properties as well as the sustainability of the final products.…”

Synthesis and properties of polydimethylsiloxane/graphene oxide modified, water‐based polyurethane/polyacrylate

“…However, hydrophilic components (mostly linear polymers with relatively low molecular weights) must be introduced during the synthesis of WPU to maintain durability; this retards the mechanical properties and water and weather resistance of the final WPU. With this connection, the introduction of polyacrylate (PA) into WPU results in waterborne polyurethane acrylate (WPUA), which supplements its water resistance and weather resistance to a certain extent …”