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

Yao-Tang Hsu,Wen-Hsin Wang,Wei-Hsi Hung

doi:10.3390/su12093745

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.

Highlights

In 2018, 359 million tons of plastic were produced, and the demand for polyurethane (PU) worldwide was 7.9%
The highly active –NH functional groups at both ends of AEAPTES increase the molecular weight of fluorinated silicon-containing waterborne polyurethanes (FSWPUs) when the AEAPTES content increases, which increases the viscosity of FSWPU emulsions and reduces their dispersal ability
Adhesion Test To assess the adhesion of FSWPUs to tiles, FSWPUs were cast between tiles, and a tensile testing machineT,oasasdseepssicttheed aindhFeigsiuorne o8f, wFSaWs ePmUpsltooyteidlesto, FeSvWalPuUatse wtheerier cshasetabresttwreenegnthti.leTsh, eantedstarteesnuslitlseare orgtaenstiiznegdmasacshionwe,n ains dTaebpliect5e.dTinheFsighuereer 8st,rwenagstehmopf lFoSyWedPtUo-e0v1awluiathteouthteAirEsAhPeaTrEsStrwenagst0h..7T8hMe Pa; whtielestthroeseulotsf FaSrWe oPrUg-a0n2izaendd aFsSWshPoUw-n03i,nwTitahbmle o5r.e TAhEeAsPhTeEerS,sgtreandgutahllyofinFcSrWeaPseUd-0a1ndwrietahcohuetd a maAxiEmAuPmTEoSf 1w.4asM0P.7a8

Summary

Introduction

In 2018, 359 million tons of plastic were produced, and the demand for polyurethane (PU) worldwide was 7.9%. In this study, silicon compounds and fluorinated compounds with two functional groups, which can react with NCO, were imported into WPU to resolve these concerns. Such chemical combinations could avoid the aggregation or precipitation of nanoparticles commonly occurring in traditional mixing methods, but could effectively increase the stability of the aqueous polyurethane lotion. This study used degradable segments as PU soft segments to improve its performance for environmental protection, and imported silicon compounds and fluorinated compounds with two functional groups to produce FSWPU emulsions. A tensile testing machine was used to analyze the sheer strength of the FSWPUs between the tiles, and an ASTM D3359 test was conducted to assess the adhesion of the FSWPUs to the tiles

Materials

2.10. Hydrolytic Stability

Emulsion and DLS

Basic Properties of FSWPUs

Surface Contact Angle

Conclusions