ADDITION OF BENTONITE AND CHITOSAN FILLING TO POLYURETHANE COATING PAINT IN AN EFFORT TO INCREASE RESISTANCE AGAINST HEAT AND ANTIBACTERIA

Abstract

The increasing market demand for polyurethane is due to its various functions, including being used as a coating material, adhesives, elastomers and hard foams.Polyurethane is a polymeric material that contains a functional group (-NHCOO-) in its main chain. In principle, polyurethane can be produced by reacting two reactive materials, polyol and isocyanate. Various researches are intensively carried out to synthesize polyurethane in order to improve the performance of polyurethane.Bentonite and chitosan are widely used as filler materials in polyurethane matrices to retain heat and improve the mechanical properties of polyurethane. The addition of bentonite and chitosan to polyurethane will affect the mechanical properties, thermal properties, and morphological structures which can be seen based on the FTIR test, TGA test, SEM test and Antibacterial test.In this study, variations of Bentonite and Chitosan 5.7.9% will be used, then the mixing process with Polyurethane will be carried out. The results showed that the results of the FTIR analysis showed that the mixing of Polyurethane and bentonite did not affect the wavelength absorption of the Polyurethane functional groups themselves. This was due to the mixing process which took place only physical bonds without chemical bonds. The results of thermogravimetric analysis (TGA) showed changes in the weight of the material when heated and it could be concluded that the best sample was B:K 9%, because it experienced less weight loss. Based on the results of the Morphological Structure test with a Scanning Electron Microscopy (SEM) chitosan chain dispersed well into the bentonite interlayer, as shown by testing using the SEM tool. The results of the antibacterial test showed that the more chitosan and bentonite added, the better the ability to inhibit the growth of Escherichia coli bacteria. In testing the activity of these bacteria it can be seen that chitosan and bentonite are better at inhibiting the growth of Escherichia coli than Staphylococcus aureus.