Evaluating the Properties of a Coating Material with Polycaprolactone-Degradable Fluorinated Silicon-Containing Waterborne Polyurethane

Abstract

This study successfully synthesized fluorinated silicon-containing waterborne polyurethanes (FSWPUs) by using polycaprolactone (PCL) diol, 2,2,3,3-Tetrafluoro-1,4-butanediol, and [3-(2-Aminoethylamino)propyl] trimethoxysilane (AEAPTES ). The FSWPU’s particle size was examined using dynamic light scattering. After the FSWPUs were processed into a dry film, their molecular weight and basic properties were analyzed using gel permeation chromatography (GPC), Fourier-transform infrared spectroscopy (FTIR), and energy-dispersive X-ray spectroscopy (EDS). Additionally, the thermal stability of the FSWPUs was inspected by thermogravimetric analysis and dynamic mechanical analysis. The tensile strength and elongation at the break of the FSWPUs before and after hydrolysis were also analyzed, using a tensile testing machine. Subsequently, FSWPU emulsions were cast between the tiles, and hydrophilicity, hydrophobicity, and surface tension were then measured on a contact-angle measurement instrument. The tensile testing machine was again employed to test the sheer strength of the FSWPUs between the tiles, and a tape test was conducted to analyze their adhesion to the tiles. The results revealed that AEAPTES functional groups can reinforce the thermal stability, tensile strength, and water resistance of FSWPUs. Moreover, the AEAPTES functional groups increased the adhesion of FSWPUs to the tiles and reduced the surface energy of the tiles.

Study on Properties of Regenerated Fluorinated Polyurethane Rigid Foam Prepared by Degrading Waste Polyurethane

“…Moreover, more and more states explicitly prohibit its burial or incineration, and it is difficult to recycle, resulting in a waste of living space and chemical resources [1,4,[10][11][12][13][14]. Therefore, how to deal with the degradation and reuse of waste PU in a green and efficient manner is crucial to determine [15][16][17][18]. The recycling prospect of waste polyurethane is very broad and has great potential research value and significance.…”

Biodegradable cationic waterborne polyurethanes from poly(caprolactone)diol and trimethylol propane monooleate

“…A previous study demonstrated that polycaprolactone (PCL) could be used as PU soft segments and imparted degradability to the PU structure. 7 PCL is a hydrophobic aliphatic polyester that can be generated from petroleum or renewable resources (e.g., polysaccharides) via chemical synthesis. 8 It is often considered as a green polymer owing to its biocompatibility and biodegradability by microorganisms.…”

Self-Assembly of Amphiphilic Linear−Dendritic Carbosilane Block Surfactant for Waterborne Polyurethane Coating

“…Polyurethane coating is an important top-coat for agriculture, construction equipment and rail transit vehicles in the paint industry because of its excellent decoration and weather-resistant capability [1][2][3]. However, traditional solvent-based polyurethane coatings are changing to more environment-friendly waterborne coatings due to environmental pollution concerns [4,5]. The two-component waterborne polyurethane coatings are generally composed of a base and hardener [6].…”

“…After the evaporation of water, polyisocyanate reacts with the hydroxyl resin to form the polymer and solidify into film. The basic reactions are given by Equations (1)- (4) [11,12].…”

“…(1) (1) Since polyisocyanate is very active, some side reactions take place during the mixing of base and hardener (see Equations (2)-(4)). (2) (3) (4) It is worth noting that the side reaction between polyisocyanate and water, originating from the base and moisture, produces carbon dioxide gas [13]. This will cause defects, because if the applied wet film is too thick, the carbon dioxide gas, which cannot escape, will cause bubbles to form.…”