Polyvinyl Butyral Synthesis Process Based on Deep Eutectic Solvent as a Catalyst
Po Li
School of Chemical Engineering, East China University of Science and Technology, 200237 Shanghai, China.
Weilan Xue *
School of Chemical Engineering, East China University of Science and Technology, 200237 Shanghai, China.
Zuoxiang Zeng
School of Chemical Engineering, East China University of Science and Technology, 200237 Shanghai, China.
Li Sun
School of Chemical Engineering, East China University of Science and Technology, 200237 Shanghai, China.
Yu Bai
Sinopec Shanghai Research Institute of Petrochemical Technology, 201208 Shanghai, China.
*Author to whom correspondence should be addressed.
Abstract
Polyvinyl butyral (PVB) was prepared by the condensation reaction of polyvinyl alcohol (PVA) with n-butyraldehyde using a catalyst which is a kind of deep eutectic solvent (DES) made of dodecyltrimethylammonium chloride and p-toluenesulfonic acid. The raw materials and products were characterized by Fourier transform infrared spectroscopy (FT-IR). The effects of the following reaction conditions on the degree of PVB acetal, yield and agglomeration of the products were investigated: the mass ratio of n-butyraldehyde to PVA (mBA/mPVA) of 0.48-0.96, the mass ratio of catalyst to PVA (mcat/mPVA) of 0.16-0.64, the low temperature reaction temperature (5-20℃), and the low temperature reaction time (1-3h). The results showed that at mBA/mPVA =0.8, mcat/mPVA =0.32, low temperature reaction temperature of 15°C and low temperature reaction time of 2 hours, the obtained PVB was a homogeneous powder with the highest acetal degree of 73.85%.
Keywords: Polyvinyl butyral, catalyst, synthesis