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The goal of the work is to study the effect of light stabilizers on the lightfastness of colours of cotton knit fabric dyed with reactive dyes. The study was carried out using a cotton 1+1 rib knit fabric with a surface weight of 150 g/cm2, prepared by the combined technology of boiling and bleaching. Dyeing of the fibrous material was carried out using Bezaktiv reactive dyes in a batch method at a concentration of 0.3% by weight of the material. UV absorbers 2,5-dihydroxyacetophenone, 2,4-dihydroxybenzophenone, phenyl salicylate and antioxidants – diatomic phenols – hydroquinone, pyrocatechol and resorcinol were chosen as light stabilizers. In the work, the light stabilization of cotton knit fabric was carried out after dyeing with reactive dyes and washing the dyed knit material. The technological mode of application of the studied light stabilizers was to impregnate a knit fabric, drying and curing the material. The individual effect of light stabilizers on the colour change of dyed knit fabric samples and the photodestruction kinetics of dyes were investigated. The insolation of the samples was carried out on a device with a mercury-tungsten lamp RF 1201 BS ("REFOND"). After treatment and insolation, the total colour difference dE of knit samples were determined compared to untreated material using a TCR-200 colorimeter ("PCE Instruments"). The results obtained indicate that the change in the initial colours after treatment with light stabilizers depends on the colour of the dye and on the type of light stabilizer. The greatest colour changes are observed with phenyl salicylate, pyrocatechol and resorcinol. It has been established that UV absorbers exhibit a light-shielding effect to a greater extent than antioxidants. The obtained experimental results also indicate the need for the simultaneous use of UV absorbers and antioxidants in order to efficiently stabilize dyed cotton knit fabric. The individual effect of light stabilizers – UV absorbers and antioxidants – on the lightfastness of colours of cotton knit fabric dyed with Bezaktiv reactive dyes is investigated. It was established that for effective light protection of colours of cotton knit fabric dyed with reactive dyes, the simultaneous use of UV absorbers and antioxidants is necessary. [ABSTRACT FROM AUTHOR]

Purpose. The purpose of the work is to study the effect of polymer coatings on the rigidity of cotton knitted fabric. Methodology. As the object of the study aqueous dispersions of acrylic copolymers and aliphatic polyurethanes are used. Standardized methods for studying the indicators of physicomechanical properties of polymer films and textile materials are used. The formed polymer films are characterized by their appearance and an indicator of relative elongation at break. Mechanical properties of cotton knitted fabric with polymer coating are evaluated in terms of rigidity. Findings. The paper presents the results of the study of the physicomechanical properties of polymer films of acrylic and urethane nature. The dependence of the elasticity of the formed films on the functional groups of the polymer and their relative position is shown. According to the results of the experiment, it was established that the rigidity of the finished knitted fabric depends primarily on the chemical structure of the polymer binder. It was determined that the studied acrylic copolymer with the adhesion promoter and aliphatic polyurethanes due to the high degree of cross-linking enhance the elastic properties of the polymerfiber composite formed. The necessity of choosing a polymer with high elasticity to form a coating on a knitted fabric was established. Originality. It is proved that the proposed styrene-acrylic copolymer due to the formation of a highly elastic film allows us to obtain a soft handle of cotton knitted fabric. Practical value. The results of the experiment are of practical importance for the development of new finishing compositions for textile materials. [ABSTRACT FROM AUTHOR]

Purpose. The goal of the work was to study the physico-chemical properties of styrene-acrylic polymer film to form a coating on a textile material. Methodology. A water dispersion of a styrene-acrylic copolymer was used as an object of study. Standardized methods for studying the indicators of the physicochemical properties of polymer films and physical properties of textile materials have been applied. The study of the structural parameters of an individual polymer film was carried out using the sol-gel method. The physical properties of the studied polymer material were evaluated according to the results of the resistance of the film to hydrolytic degradation at different processing temperatures and the effects of soap and soda solution. The quality of cotton knitted fabric with the formed polymer coating was evaluated by the change in hygroscopicity and breathability. Findings. The paper presents the results of a study of the structural and physical properties of polymer film based on the styrene-acrylic copolymer. The optimal polymer composition was determined to create a coating on the textile material and the concentration of the proposed composition was established, at which the hygienic properties of the cotton knitted fabric did not deteriorate. Originality. It is proved that the proposed polymer composition allows you to create a resistant coating on cotton knitted fabric and at the same time keeps hygroscopicity and breathability of knitted сloth. Practical value. The results of the experiment are of practical importance for the development of new finishing compositions for textile materials. [ABSTRACT FROM AUTHOR]

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