Optical Brightener DMS has two structures. The α-amorphous structure is light yellow powder, and the β-crystalline form is white crystals. β-crystal form has a good whitening effect. It has a high affinity for cellulose fibers. It is stable to chlorine bleaching agent and has a high whitening effect in the range of 20-100℃. The absorption peak wavelength is 349nm Chemicalbook, and the fluorescence emission wavelength is 442nm. The solubility in water is moderate, less than that of whitening agents VBL and JD-3. It can be dissolved in monoglycol and can be made into a 10% suspension with hot water. Anionic, can be blended with anionic surfactants, dyes, and non-ionic surfactants. The fluorescent hue is cyan.
Optical Brightener DMS is used for whitening cotton fiber, nylon and other fabrics. The washing powder formulated with this product has an excellent whitening effect on cotton, linen and synthetic fibers.
First add 850kg of water to the batching tank, add 285kg of DSD acid under stirring, and adjust the pH value to 6-7 with 10% sodium carbonate aqueous solution after heating to dissolve. Then move it into the high slot for use. Add 3000kg of ice water into the condensation kettle, and add 1400kg of 20% cyanuric acetone solution below 0°C. Stir to make it evenly dispersed, and then add DSD sodium aqueous solution dropwise at 0-5°C. Use 10% sodium carbonate solution to adjust the pH value at any time to maintain it at 6-7.5. After the drop of Chemicalbook, 156 kg of aniline was added. After reacting at 30～35℃ for 2h, add 170kg of morphine and react at 80℃ for another 2h. After the reaction is complete, distill acetone, add alkali to adjust pH to 6～7.5, heat to 120～130℃, At this temperature, the α-amorphous form becomes β-crystalline. After crystal transformation, cooling, filtering, washing the filter cake with water, adding a certain amount of sodium carbonate to kneading, drying at 80°C, blending with sodium sulfate (anhydrous sodium sulfate) to achieve the required fluorescence intensity to obtain the Optical Brightener DMS.