Method for preparing stable latex of copolymer containing fluorinated acrylic ester

Abstract

The present method of fluorine-contained acrylic ester copolymer stable emulsion includes the following steps: in the container equipped with stirrer, reflux condenser tube, N2 gas protection and charging device adding anionic / non-ionic composite emulsifier, then placing the water, polymerization monomer, acetone, chain transfer agent and initiator into said container, severaly stirring for 0.5-2 hr at normal temperature to obtain uniform pre-emulsion; dividing said pre-emulsion into two portions, heating one-third of the pre-emulsion to 55 deg.C-75 deg.C ioinitiate polymerization reaction, after the reaction liquor produces blue light, drop-adding residual pre-emulsion, drop-adding time is 1.5h-2.5h, after the drop additionis completed, adding residual initiator, heat-insulating reaction for 2-6 hr, stirring and cooling to room temperature so as to obtain the invented product.

Description

technical field [0001] The present invention relates to a process for the preparation of stable fluoroacrylate copolymer emulsions for imparting water and oil repellency to fabrics. Background technique [0002] The surface tension of the fluorine-containing acrylate copolymer emulsion can be as low as 10-15 dyn / cm, and it can be used as a surface treatment agent for textiles, showing excellent water and oil repellency. Fluorine-containing acrylate polymers usually contain pendant perfluoroalkyl groups with 3 or more carbon atoms, and these perfluoroalkyl groups are generally connected to the fluorine-free backbone polymer chain through various linking groups Above, these backbone polymers can be (meth)acrylate, vinyl, vinylidene or other groups. At the same time, some non-fluorine monomers are used in the synthesis of fluorine-containing acrylate copolymer emulsions. The use of these non-fluorine monomers is mainly used to adjust the performance of ...

AI Technical Summary

Problems solved by technology

Although the effect of the fluorine-containing acrylate copolymer emulsion disclosed in the prior art is satisfactory under certain application conditions, the emulsion has poor stability under some conditions

For example: in high temperature, low temperature, high pH environment, or left for too long, the emulsion will produce flocculation or precipitation, which reduces the performance of the emulsion and affects the application of the emulsion