The purpose of this paper is to demonstrate that 1,3-divinyltetramethyldisiloxane (DVMS) and dodecafluoroheptyl methacrylate (DFMA) are used to modify the p(BA-MMA-VAc-Veova10) latex. The heat resistance and water resistance of the resultant film latex have been improved. In addition, the mixture of allyl alkyl alcohol polyoxyethylene ether monoester ammonium sulfonate (X-616), a reactive anionic surfactant and isomeric tridecyl polyoxyethylene(9) ether (1309) nonionic emulsifier is used as the emulsifier, which brings the new application of the above surfactants.
The p(BA-MMA-VAc-Veova10) latex has been successfully synthesized via the semicontinuous seeded emulsion polymerization, butyl acrylate (BA), methyl methacrylate (MMA), vinyl acetate (VAc), tertiary vinyl carbonate (VeoVa10) are the main monomers and reactive anionic surfactant of X-616 and the nonionic emulsifier of 1309 are used as the emulsifier. DVMS and DFMA are used as the modified monomers. Potassium persulfate is the initiator. The structure of the resultant film is characterized by Fourier transform infrared spectroscopy. The films of the resultant latexes are tested by the thermogravimetric analysis, differential scanning calorimetry and contact angle (CA). The particle size of the latex is measured with the Zetatrac dynamic light scattering instrument.
A detailed investigation was conducted on the factors influencing the properties of the latex and film. The conditions for the best comprehensive performance of the latex and its resultant film are as follows: the amount of emulsifier is 5 wt%; the mass ratio of X-616 to 1309 is 1:1; the amount of initiator is 0.6 wt%; the amount of DVMS and DFMA is 4 and 2 wt%, respectively. The latex has good mechanical and chemical stability and ideal storage stability. The appearance of the resultant latex is translucent and blue with a small particle size. The water CA increased from 67.17° to 98.63° and the thermal decomposition temperature increased from 285.50° to 292.17° before and after fluorosilicon modification.
The resultant latex can be used in both the waterborne interior and exterior wall coatings and other fields, which can satisfy the high demand for thermal stability and hydrophobicity.
The modification of p(BA-MMA-VAc-Veova10) latex with the new emulsifiers and the fluorosilicone monomers has not been widely reported. In this study, the p(BA-MMA-VAc-Veova10) latex has been successfully synthesized via the semicontinuous seeded emulsion polymerization, BA, MMA, VAc and VeoVa10 are the main monomers, and X-616, which is a reactive anionic surfactant and 1309, which is a nonionic emulsifier, are used as the emulsifiers. DVMS and DFMA are used as the modified monomers.
