Dyeing textile fibers polyester

Sulfur dyes are used mainly for dyeing textile ceUulosic materials or blends of ceUulosic fibers (qv) with synthetic fibers such as acryUc fibers, polyamides (nylons), and polyesters. They are also used for sHk (qv) and paper (qv) in limited quantities for specific appHcations. Solubilized sulfur dyes are used on certain types of leathers (qv). 

Classification by usage or appHcation is the principal system adopted by the Colour Index (5). Because the most important textile fibers are cotton (qv) and polyester, the most important dye types are those used for dyeing these two fibers, including polyester—cotton blends (see Fibers, polyester). 

Basic (Cationic) Dyes. The use of basic dyes is confined mainly to acryUc textile fibers, acetate, and as complementary dyes for acid-modified polyester fibers that accept this class of dyes. 

Polyester fibers represent the most important group of man-made fibers. With an annual production volume of 19.2 Mt, polyester fibers hold second position in world production of textile fibers [10]. Polyester is usually dyed with disperse dyes. 

Aramid fibers, i.e. polyamide textile fibers made from aromatic amines and dicar-boxylic acid [177] are similar to polyamide and polyester fibers and are highly heat resistant and flame retardant. Aramid fibers must be heat set by steaming before wet finishing and washed before dyeing for good leveling. 

Ink Dyes for Textiles. The two main textile fibers are cellulose (cotton) and polyester. Ink-jet dyes for cotton are existing textile reactive dyes [18,19] but purified... 

Azoic dyes. Azo dyes contain at least one azo group (—N=N—) attached to one or often two aromatic rings. They are produced in textile fibers (usually cotton, rayon, and polyester), by diazotization of a primary aromatic amine followed by coupling of the resulting diazonium salt with an electron-rich nucleophile (azo coupling). A variety of hues can be obtained... 

The world textile industry is one of the largest consumers of dyestuffs. An understanding of the chemistry of textile fibers is necessary to select an appropriate dye from each of the several dye classes so that the textile product requirements for proper shade, fastness, and economics are achieved. The properties of some of the more commercially important natural and synthetic fibers are briefly discussed in this section. The natural fibers may be from plant sources (such as cotton and flax), animal sources (such as wool and silk), or chemically modified natural materials (such as rayon and acetate fibers). The synthetic fibers include nylon, polyester, acrylics, polyolefins, and spindex. The various types of fiber along with the type of dye needed are summarized in Table 8.2. 

CAS 7128-64-5 EINECS/ELINCS 230-426-4 Uses Fluorescent whitener, optical brightener for thermoplastics (PVC, PE, PP, cellulose acetate, PS, PC, acrylics, polyolefins, PU, linear polyester, polyamides), adhesives, coatings, printing inks (for security bonds, bank notes), dyes, textiles (syn. fibers incl. PVC and acetate), molded articles, films, sheets, syn. leather, waxes, fats, and oils tracer in clear coatings... 

Urticaria is observed even less frequently. Pauluzzi et al. (1995), for example, examined a 36-year-old dressmaker who had chronic urticaria for two years. This condition developed a few months after the patient began making garments from polyester fabrics. Clinical features, challenge tests, and the patient s answers to the dermatologist s questions were consistent with a diagnosis of contact urticaria due to dyes of textile fibers. The specific allergen was not identified. Amin et al. (1997) review contact urticaria. 

In certain cases, identifying the specific garment or textile product and the allergen it contains will be an important undertaking. The fiber content of the fabric will narrow the possible dyes, as certain dyes are used to color certain fibers. Cotton, rayon, and linen fabrics are dyed with direct, fiber-reactive, mordant, azoic, sulfur, and vat dyes. Wool fabrics are dyed with acid, mordant, and fiber-reactive dyes. Polyester fabrics are dyed with disperse dyes unless the polyester is modified to accept basic dyes. Nylon fabrics are colored with acid and disperse dyes unless modified to accept basic dyes. Acrylic fabrics are dyed with basic and disperse dyes. Acetate fabrics are dyed with disperse dyes. Other synthetic fibers are dyed with disperse dyes. 

Dyes were extracted from polyester and diacetate textile fibers and analyzed... 

Cegarra R, Puente P. (1967), Considerations on the Kinetics of the Dyeing Process of Polyester Fibers with Dispersed Dyes Textile Research Journal, 37, 343-50. 

Uses Defoamer for atmospheric dyeing and finishing suitable for nylon, cellulosic, and polyester textile fibers... 

Antlblaze 19. Antiblaze 19 (Mobil), a flame retardant for polyester fibers (134), is a nontoxic mixture of cycHc phosphonate esters. Antiblaze 19 is 100% active, whereas Antiblaze 19T is a 93% active, low viscosity formulation for textile use. Both are miscible with water and are compatible with wetting agents, thickeners, buffers, and most disperse dye formulations. Antiblaze 19 or 19T can be diffused into 100% polyester fabrics by the Thermosol process for disperse dyeing and printing. This requires heating at 170—220°C for 30—60 s. 

Carpet. Carpet, an important textile, may also be treated to provide water and oU repeUency however, the principal functions of the current carpet treatments are to provide soU and stain resistance. High quaUty carpets, especiaUy those made from nylon, polyester, or wool, have a significant proportion of the surface coated with fluorochemical materials. The treatments can be spray-appUed to a finished carpet or appUed directly to the fiber during the spinning or dyeing operations. Suitable fluorinated resin materials are readily avaUable from 3M or DuPont. 

Disperse—Vat Combinations. These require a two-step fixation. The disperse dye is fixed first, usually by dry heat, followed by impregnating of the textile with an alkaU and reducing agent solution and short steam fixation for the vat dye. The selected disperse dyes fixed in the polyester fiber are not destroyed by the reducing agent, but disperse dye remaining on the cellulose is destroyed. 

Cellulosics and polyester together account for 78 % of world textile consumption. Following this trend, disperse dyes and dyes for cellulosic fibers reclaimed the principal market share (Table 4.2). 

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