Improvement wool dying processes

It is known that the dyeing process used in laboratory conditions does not allow taking into account the influence of such parameters as the flow rate of the dye solution, the density when placing the dyed fibers, etc. In this regard, the article considers the use of a plant for dyeing textile materials, including dyeing fibers weighing 1-10 grams. In this regard, the article considers the use of a plant for dyeing textile materials, including dyeing fibers weighing 1-10 grams. The influence of the speed of movement of the dyeing system in the range of 1.1 to 1.8 m/min and the weight of the fiber in the dyeing volume in the range of 27.7-125 kg/m3 on the absorption of dyes from the dye bath was studied. When changing the speed of the flow of the dyeing system in the range of 1.1-1.43 m/min, an increase in the content of the dye on the fiber and an increase in the brightness of the color in the range of 37.5-48.9 are observed. It should be noted that with an increase in the flow rate of the dyeing system over 1.43 m/min, the amount of dye on the fiber decreases the brightness to 41.6. This can be judged from the results of measuring the brightness of the color and the coefficient of unevenness, which amounted to 11.24%. The use of the considered installation for dyeing textile materials in the conditions of dyeing shops of the finishing production of the textile industry will allow you to quickly introduce new dyeing recipes and significantly reduce the time for their practical implementation

Chemical nature of dye interaction when dying fur sheepskin

The article substantiates the use of active dyes with vinylsulfone and chlorotriazine groups in leather and fur production in order to obtain fur sheepskin with an improved set of consumer properties. The kinetic regularities of the processes of diffusion, fixation and hydrolysis of active dyes have been studied. This makes it possible to increase the efficiency of the process of dyeing fur sheepskin and the completeness of the use of active dyes. In monofunctional active bright blue 53Sh, only 56.7 % of 72.2 % of the total amount of sorbed dye is fixed by covalent bonds, in mono-bifunctional active brown - 65.9 % of 73.7 %, in hetero-bifunctional active bright red 5CX - 71.6 % of 77.1 %. The anomalous nature of the chemical reactions of active dyes with water and with woolen fiber has been established. The practical significance lies in the development of theoretical foundations for predicting changes in the degree of fixation and the efficiency indicator of the process of dyeing fur sheepskin under the influence of temperature, pH and other factors

Processing of hybrid wood plastic composite reinforced with short PET fibers

Poly(ethylene terephthalate) (PET) fibers (virgin, waste, and mixed) were incorporated in the composite poly(methyl methacrylate) (PMMA)-wood. Hybrid composite panels were prepared by pressure molding. Toluene-2,4-diisocyanate (TDI) and (3-mercaptopropyl)trimethoxysilane (MPTMS) were used as cross-linking bonding agents for modification of wood fibers. Influence of cross-linking bonding agents, structure, and composition of PET fibers was examined by studying thermomechanical properties as well as moisture absorption. Moisture absorption was lower for composites with bonding agents. Mechanical testing revealed that the addition of PET fibers drastically enhances properties of the composites. Covalent and hydrogen bonds formed with the addition of bonding agents have also improved mechanical properties compared to the untreated composites