Yuan Mingfen (anhydrous sodium sulfate / mirabilite) and industry of Yandu is composed of strong acid and strong alkali salt, easy to dissolve in water. The chemical name of Glauber's salt is sodium sulfate, chemically produced by sulfuric acid and caustic soda (H2SO4+2NaOH → Na2SO4+2H2O). The chemical name of industrial salt is sodium chloride, a chemical which is generated by hydrochloric acid and caustic soda (HCI+NaOH → NaCI+H2O). In the actual production costs, the two substances is a kind of mineral resources, by underground brine pumped evaporation and.
Yuan Mingfen (anhydrous sodium sulfate / mirabilite) as accelerating agent and industry of Yandu can be used for direct dyes, sulfur dyes, vat dyes, reactive dyes and soluble vat dye cotton fibers, adjustable dye on the fiber dyeing rate. Glauber's salt and industrial salt can also be used for dyeing wool and acrylic acid dye and cationic dye retarding agent, in order to reduce the adsorption of dye fiber speed, achieve levelling requirements. Glauber's salt and industrial salt in dye and fiber dyeing mechanism is basically the same, due to the direct dye dyeing rate is low, not easy to be sucked back fibers dyes, dyeing water residue dye more, adding sodium sulfate or industrial salt can reduce the solubility of dyes in water, promote the combination of dyes and fibers, increase the dye uptake rate. So the amount of dyes can be reduced, and the dyed color can deepen. And their dosage, dyeing rate depends on the dye and the dye depth of color, do not add too much or too fast, too much can make dye precipitation occurs, causing dyeing cloth. Too fast, dye color fast, easy to produce irregularity. Therefore, Glauber's salt and industrial salt with water dissolved before use, the filter before adding the dye bath. But it should be noted that the end can not be added before dyeing. Fixed before staining dye concentration is high, such as adding sodium sulfate or industrial salt, dye dyeing fiber too fast, easy to produce not leveling. Generally in the staining after a period of time, the sodium sulfate or industrial salt added, namely join or can be several times to join. Practice has proved that, using sodium sulfate as accelerating agent, the dyeing color more colorful, bright, and industrial salt as accelerating agent, the effect of poor. The purity of industrial salt. Because the salt in general industry, but contains a lot of calcium, magnesium in plasma, containing a small amount of iron ions, and some dye affected by iron ion will cause the light gray. Some people think that the industrial salt is cheap and do not intend to use sodium sulfate. Practice has proved: with light colored to China, should take the sodium sulfate is preferred, with dark can use industrial salt.
Yuan Mingfen (anhydrous sodium sulfate / mirabilite) and industrial salt for acid dye silk, wool as the corrosion mechanism of dye is: wool and silk are protein fiber. Fiber molecules containing NH2 base, when dyed with acid dyes in acidic solution, hydrogen ion H+ in acid liquid quickly spread to the inside of the fiber and NH2 combined with NH3+, the fiber with positive charge, and the pigment ion of acid dyes negatively charged D-, because the fibers and dyes with different charge the ionic bond, and synthesis of NH3 · D. When adding sodium sulfate or industrial salt solution, due to the hydrogen ion and sulfate ion SO42- industrial salt sodium sulfate negatively charged negatively charged energy and pigment ion D- dyes have competing dyeing and dyeing of -NH3+ fiber in the first position, synthesis of NH3CI and node (NH3) 2SO4, and the at high temperature, D- replaces the SO42- or CI- position, the dye uptake, thus retarding effect.
Yuan Mingfen (anhydrous sodium sulfate / mirabilite) in printing and dyeing production can also be printed silk fabric (or colored silk fabric). White color protecting agent. In the refining of printed or dyed silk fabric, dye may be peeling, so that the stain color or other training with the fabric, adding sodium sulfate can decrease the solubility of dye, so as not to dye stains the ground colour. Industrial salt can also be used as a naphthol bottoming when increasing the absorption quantity. Adding a certain amount of industrial salt in backing bath naphthol dyeing cotton yarns, which can greatly improve the absorption of AS naphthol, also can be used as sulfonated coal or sodium cation exchange resin with industrial salt, as activator activator and pancreatin. Using sodium sulfate had no effect.
The sodium sulfate (anhydrous sodium sulfate / mirabilite) and mechanism of industrial salt in dyeing and the difference, the difference between dosage, the two copies: 5 industrial salt = 6 copies of anhydrous sodium sulfate = 12 crystalline sodium sulfate. Anhydrous sodium sulfate 100 ≈ 100 industrial salts ≈ 227 crystal sodium sulfate. The crystallization of sodium sulfate as the molecular formula Na2SO4 and the molecular weight of 10H2O was 322.2, and the molecular anhydrous sodium sulfate as the molecular weight of Na2SO4 was 142.06, that of anhydrous sodium sulfate as the 2.27 times crystallized sodium sulfate. Therefore, anhydrous sodium sulfate and industrial salt consumption is basically the same. If the crystalline sodium sulfate, anhydrous sodium sulfate and its dosage is doubled or field dosage doubled.