L. V. Redina

Efficacy of using domestic and imported preparations for giving fibre materials oil- and water-repellent properties

The efficacy of using domestic (LFM-3) and imported (Oleophobol C and Scotchgard FC-251) preparations for decreasing the wettability of fibre materials was investigated. A significant difference in the chemical composition of the preparations, latex particle charge, and stability of dispersions was found. It was shown that the domestic and imported products are equally effective for giving fibre materials oil- and water-repellent properties, and LFM is more technologically effective.

Electrospinning of Ultrahydrophobic Copoly(Fluoroalkyl Acrylate) Materials

The properties of solutions of copolymers of 1,1,5-trihydroperfluoroamylacrylate and styrene in various ratios, i.e., the polymer—solvent solubility parameter, rheological characteristics, and surface tension, were studied to produce nanofibrous materials with improved anti-adhesive properties. The copolymer composition and electrospinning conditions that produced nanofibrous materials with ultrahydrophobic and improved acid-repellent properties were determined.

Modification of acetate fibers by adding fluoropolymers to the spinning solution

The ability to prepare modified acetate fiber by adding fluoropolymer to the spinning solution was examined. Poly-2-perfluoropentoxytetrafluoropropylacrylate was used as the modifier. The rheological properties of the spinning solution of secondary cellulose acetate with added fluoropolymer were investigated. Fibers were spun from composite solutions of secondary cellulose acetate and various amounts of poly-2-perfluoropentoxytetrapropylacrylate using a coagulation (wet) method. Their lipophobic properties were studied. The thermal properties of the modified acetate fiber were studied using thermogravimetric analysis.

Comparative Effectiveness of Use of Fluorine-Containing Polymer Modifiers to Reduce the Wettability of Viscose Fibres

The comparative effectiveness of using polyfluoroalkyl acrylates, which have the structure of a fluoroalkyl radical, in reducing the wettability of viscose fibres was investigated. It was shown that incorporation of an oxygen atom in the fluoroalkyl chain decreases the efficiency of modification with all other conditions being equal. An important increase in the level of unwettability can be attained by regulating the colloid chemical indexes of polyfluoroalkyl acrylate latexes, their particle charge values in particular.

Modification of Polyester Fibres to Give Them Nonstick Properties

A method for modifying polyester fibres by incorporating a fluorine-containing polymer in the surface layer of the fibres was developed to give the fibres nonstick properties with respect to liquids of different chemical nature. It is best to use polyfluoroalkyl acrylate latex stabilized with a cationic or nonionogenic SF for modification, since it gives the fibre antistatic as well as nonstick properties.

Efficiency of using electrolytes in fabrication of fibre materials with low wettability

The efficiency of using electrolytes in fabrication of fibre materials with reduced wettability by treatment with latexes of fluorine-containing copolymers was investigated. The aggregate stability of LFM-2 latex with respect to electrolytes and the effect of the character of the electrolyte on the rate of sorption of latex particles by the fibre were investigated. It was found that the rate of sorption of the polymer by the fibre is only a function of the concentration of electrolyte and differs insignificantly for electrolytes of different types. For the same concentration of polymer modifier in the fibre, the greatest decrease in wettability is attained in processing with a composite containing aluminum sulfate.

New methods of modifying the surface of chemical fibres to decrease wettability

The effectiveness of using latexes of polymers with a composite particle structure for decreasing the wettability of fibres was investigated. It was found that systems prepared by mixing poly-(1, 1-dihydroperfluoroheptyl acrylate) (PPHA) (LFM-3) with the latexes of unfluorinated polymers can be used to decrease the wettability of viscose fibres and materials made from them, and the maximum effect of decreasing the wettability is attained when a mixture of LFM-3 and SKD-1 is used in the ratio of 60:40 wt. %.

Viscose materials with soil-repellent properties

The possibility of fabricating viscose fibres with soil-repellent properties by modifying them with composites based on fluorine-containing copolymer latexes produced by domestic industry was investigated. It was shown that the use of composite systems based on fluorine-containing copolymers will allow obtaining viscose materials with a high level of soil-repellent properties, especially with respect to organic contaminants and water systems.

Use of new fluorine-containing copolymers for fabrication of fibres with low wettability

The effectiveness of using new fluorine-containing copolymers of different molar and molecular composition for decreasing the wettability of fibres was investigated. It was shown that copolymers of 1,1′-dihydroperfluoroheptyl acrylate and 1,1′, 5-trihydroperfluoroamyl acrylate, 1,1′-dihydroperfluoroamyl methacrylate, and 1,1′, 5-trihydroperfluoroamyl acrylate containing 30–35 wt. % of the second component, which is less expensive and more available, can be used instead of the expensive polymer modifier polyperfluoroheptyl acrylate to decrease the wettability of viscose and polyester fibres and materials based on them, and to give them oil- and acid-repellent properties.