Hydrolysis and dyeing of polyester fabric using microwave irradiation

Abstract

Polyester fabric was hydrolysed using aqueous sodium hydroxide under microwave irradiation. Increasing levels of weight loss and thickness reduction were observed with increasing microwave intensity and increasing concentrations of sodium hydroxide. Comparison of the results obtained from the microwave irradiation method and the conventional heating method showed that the rate of hydrolysis was greater using microwave irradiation. The treated fabric was then dyed using microwave irradiation to heat the dyebath. Increased levels of dye uptake were observed with increasing weight loss of the hydrolysed polyester fabric.

The modification of the polyester knitted fabric for more economic dyeing

“…For example, similar results in the change of mass are noticed after the previous process of PES textile by microwave radiation [9]. Namely, the samples of the PES fabric treated with 1% solution of caustic soda in the presence of microwave radiation have shown the mass loss, approximately 5.2%.…”

“…The second one, the fineness of fibres is decreased, porosity is improved and thereby the input of moisture into the fabric is increased. However, when the mass loss of the fabric is very high, the fabric becomes thin and the distance between the fibres or yarn larger, and then the capillarity is partially decreased [9].…”

“…Similarly, the greater mass loss of the PES fabric due to alkali hydrolysis under microwave radiation causes the greater velocity of dye exhaustion, which means that the previously processed fabric can dye faster than the untreated fabric. Then, simultaneously, the percentage of the 6(2) (2017) 60-66 absorbed dye by PES fabric is larger, which again means that the time of dying can be shorten and the temperature of dyeing reduced [9].…”

Investigation Of The Effect Of The Dyeing Method On The Dyeing Properties Of Wool Fabrics Dyed With Natural Dyes Extracted From Vaccinium Corymbosum L.

“…Adjective dyes need some additives to provide colour, wash, and light fastness [1]. Textile industry has investigated new technologies to solve textile dyeing problems which are water pollution, usage a lot of dye and time consuming because of insufficient conventional systems [15][16][17][18][19][20][21]. New Textile technologies are plasma, ultrasonic and microwave systems.…”

“…Ultrasonic system provides dye efficiency increasing under lower temperature and lower chemical concentration as well as ultrasonic textile application has shorter reaction cycle, less expensive, ecological features and ultrasonic system provides better colourfastness and light fastness when compared to the conventional textile applications [3,5,6,12,13]. Another new textile application is microwave systems which are used to decrease the reaction cycle, energy consumption as well as dye efficiency increases after the microwave application [11][12][13][14][15][16][17][18][19][20]. In this study wool fabrics were dyed with the natural dyes extracted from Vaccinium Corymbosum L.via ultrasonic, microwave and conventional methods.…”