AATCC 154:2006 pdf download.Thermal Fixation Properties of Disperse Dyes
1.1 This test method is used to deter- mine the fixation properties of disperse dyes on polyester/cellulose blends as a function of fixation conditions. The vari- able described herein is temperature; however, variations in time and/or con- centration of dyes and/or auxiliaries may be studied by this method.
2. Principle
2.1 The dye is padded onto the blend fabric at a specified concentration; the fabric is dried and the dye is fixed by ex- posure to controlled conditions of time and temperature. The cotton portion of the blend is dissolved in concentrated sul- furic acid followed by neutralization and thorough rinsing.
2.2 The reflectance values of the dyed fabrics, exposed to the several fixation conditions, are determined by spectro- photometry and the concentrations of dye relative to the heaviest dyeing (as 100%) are evaluated by applying the Kubelka- Munk function (K/S). These results ex- press the relative dye fixation for a partic- ular set of dyeing conditions. Alterna- tively, the dye on the fabric can be extracted with a suitable solvent and the concentrations of dye determined by transmittance spectrophotometry. When the dye concentrations on the fixed sam- ples are compared to the corresponding concentration on a padded but unfixed sample, a measure of the true dye fixa- tion, as a function of applied dye, may be obtained.
8.2 As an alternate method of evalua- tion, an accurately weighed sample (250 mg) may be individually extracted in sev- eral small portions of chlorobenzene at the boil (132°C or 270°F). When the dye is completely removed from the sub- strate, transfer the extract quantitatively to a volumetric flask and dilute with addi- tional chlorobenzene (see 11.7). Trans- mittance measurements made at the point of minimum transmittance or maximum absorption in the visible area of the spec- trum of the extracts of fixed samples are compared to the corresponding measure- ments of extracts of the padded, unfixed sample (as 100%). AATCC 154 pdf download.