Copolimerização em Emulsão de Acetato de Vinila e Acrilato de Butila com Alto Teor de Sólidos
High Solid Contents Semi-Batch Emulsion Copolymerization of Vinyl Acetate and Butyl Acrylate
Giudici, Reinaldo; Palma, Mauri
http://dx.doi.org/10.1590/S0104-14282006000400005
Polímeros: Ciência e Tecnologia, vol.16, n4, p.269-275, 2006
Resumo
Neste trabalho foi investigada a influência da concentração de uma mistura dos emulsificantes nonilfenol etoxilado e sulfato sódico de nonilfenol etoxilado (não iônico e iônico, respectivamente) e concentração de protetor coloidal, poli (álcool vinílico) na estabilidade coloidal de látices do copolímero acetato de vinila (AV)/acrilato de butila (AB) com alto teor de sólidos. Foram determinados o teor de sólidos e o tamanho médio das partículas ao longo da reação e foram obtidas as viscosidades das emulsões finais. Os ensaios foram realizados de acordo com um projeto fatorial com 3 níveis de concentração de emulsificantes e de protetor coloidal. Foi verificado que são necessárias maiores quantidades relativas de emulsificantes e de protetor coloidal pela massa total de monômeros para se obter látices estáveis com teores de sólidos de 70 e 73% (m/m). Os tamanhos médios das partículas no final de cada ensaio foram relativamente elevados (800 a 1000 nm) e as viscosidades a 20°C relativamente baixas (500 mPa.s) para teor de sólidos de 67% (m/m); para teor de sólidos de 70% (m/m) as viscosidades variaram de 5.000 a 10.000 mPa.s e para teor de sólidos de 73% (m/m) a viscosidade foi de 365.000 mPa.s
Palavras-chave
Alto teor de sólidos, copolimerização, acrilato de butila, acetato de vinila, polimerização em emulsão, reator semi contínuo
Abstract
In this work the influence of the concentration of ionic (alkyl phenol polyglycol ether sodium sulfate), and non-ionic (alkyl phenol polyglycol ether), surfactants mixture and of protective colloid (polyvinyl alcohol) on the colloidal stability of high solid contents butyl acrylate/vinyl acetate copolymers latexes was investigated. Solid contents and particle diameter were determined along the reaction and, at the end of each run, also the emulsion viscosity. The experiments were carried out according to a factorial design with three levels of surfactant and protective colloid concentrations. Higher amounts of surfactant and protective colloid per total monomers were required for the colloidal stability of emulsions with total solid contents of 70 and 73 wt. (%). The particle diameters at the end of the experiment were rather large (800 to 1000 nm) and the viscosities at 20 °C rather small (500 mPa.s) for solid contents of 67 wt. (%); for higher values of solid contents (70 and 73 wt. (%)) the viscosities were as high as 5000 to 10000 and 365000 mPa.s, respectively.
Keywords
High solid contents, copolymerization, vinyl acetate, emulsion polymerization, semi-batch
References
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