The purpose of this work is the chemical modification of cotton fabrics with natural globular protein. Modification was carried out in the process of finishing cotton fabrics, after decoction and bleaching in a continuous mode. The effect of modification on the strength, protein content and functional groups of cotton fabric has been studied. According to the results obtained using the AUTOGRAPH AGS-N machine, it was found that the modification of cotton fabrics with a solution of globular protein increases the strength of the treated fabrics, depending on the concentration of the modifier and the temperature regime. Treatment with a highly concentrated protein solution completely fills the fabric structure, which reduces strength and breathability. Due to the fixation of the structure, the elongation at break is reduced to 15.5%, shrinkage - up to 1.6 times. High-temperature treatment of the fabric with a low concentration solution increases strength and reduces shrinkage by 2 times. Apparently, the relatively high-temperature regime of impregnation promotes better dissolution of the protein and thereby increases the diffusion of the protein into the tissue structure. This is confirmed by the protein content in the modified sample determined on the Hanon K1100F automatic analyzer. According to the results of IR Fourier spectral analysis, it was found that the modification of cotton fabrics with globule protein leads to an increase in hydrogen bonds of various nature, a decrease in the number of characteristic -CH2- and -CH3 groups of the protein globule in the spectrum. This may be due to the addition of protein to cellulose. Due to the increase in functional groups in the structure of modified cellulose, hydrogen bonds increase, and a decrease in the –COO– ion can be the reason for the chemical interaction of the ion with the hydroxyl groups of cellulose.

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