Síntese de nanolátices acrílicos por polimerização em emulsão para aplicação em tingimento de malha de fibra de soja

Abstract

In this work, nanolatexes were produced by semicontinuous emulsion polymerization. Parameters such as monomeric composition, initiator and surfactant type were investigated in order to obtain a nanolatex with small particle size and high functionalized surface area. Afterwards, the nanolatex was used as a binder to improve the dyeing process of soybean protein fiber (SBF) fabric with a cationic dye (Basic Red 46). The best monomer composition was the one with the following ratio in mass BA/MMA/MAA (5:4:1). The best performance as an initiator was presented by APS, and the SDS had the best performance as a surfactant. The polymeric particles were analyzed by several techniques such as: gravimetry, DLS, SEM, HRTEM, FTIR, ELS, tensiometry, and conductometry titration. Nanolatexes with particle size as small as 29 nm and surface charge up to 93.8 μC/cm2 were obtained through emulsion polymerization technique. The presence of nanolatex on the surface of the soybean fiber was verified by FTIR and TGA analysis. The nanolatex efficiency as an additive to modify the dyeing process was evaluated by colorimetric data using the Kubelka-Munk equation. Preliminary tests showed that the fabrics functionalized with nanolatex had an increase of up to 13% in color intensiity, showing its ability to be used as surface additive in the dyeing process.