Preparation and properties of fluorine modified butyl acrylate/methyl methacrylate/ vinyl acetate/ tertiary vinyl carbonate quaternary polymer latex
Zheqing Gong, Lijun Chen
Том 87 №1
7 просмотров;
Acrylate polymer latex and vinyl acetate-tert-carbonatepolymer latex have been widely used as waterborne coating polymers for many industrial applications. A large number of open literatures have reported on the preparation and modification of acrylate latex or vinyl acetate-tert-vinyl carbonate latex, which are synthesized with semi-continuous seeded or soap-free emulsion polymerization or other advanced emulsion polymerization technology. However, the fluorine modified BA/MMA/VAc/VeoVa10 quaternary cross-linked polymer latex has not been reported in the open literatures. In this study, butyl acrylate (BA), methyl methacrylate (MMA), vinyl acetate (VAc), tertiary vinyl carbonate (VeoVa10) are the main monomers, and sulfosuccinateethoxyether alkyl monoester disodium salt(X-40) and alkylphenolpolyoxyethylene ether (LB-407) are used as the emulsifiers. Hydroxypropylmethacrylate (HPMA) and hexafluorobutyl methacrylate (HFMA) are used as the modified monomers. Potassium persulfate (KPS) is the initiator. The fluorine modified polymer latex is prepared via the semi-continuous seeded emulsion polymerization. The structure of the latex film is characterized by Fourier transform infrared spectroscopy (FTIR). Latex films are tested by the thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and contact angle (CA). The particle size of the latex is measured with the Zetatrac dynamic light scattering instrument. The conditions for preparing the resultant latex is optimized and obtained as follows: the amount of emulsifier is 7wt%; the amount of initiator is 0.8wt%; the amount of HFMA is 5wt%. The appearance of the resultant latex is translucent and blue and the average particle size of the polymer latex and its distribution are small, which is 57.89nm and 0.048, respectively. The water contact angle increased to 95.45°.Thermal decomposition temperature of the film of the fluorine modified polymer latex is 17.33°C higher than that of the film of conventional polymer latex.