Disodium Hydrogen Phosphate Dodecahydrate：The “invisible assistant” of the printing and dyeing industry

In dyeing and printing factories, bolts of fabric undergo multiple processes to become colorful finished products. Among these processes, there is an “invisible assistant” that plays an indispensable role—Disodium Hydrogen Phosphate Dodecahydrate. Though it may seem ordinary, it plays a crucial role in several key stages of the dyeing and printing process.
1. Stable bleaching for purer fabrics
The first step in dyeing is usually bleaching, and hydrogen peroxide is a commonly used bleaching agent. However, hydrogen peroxide has a “temperamental” side, as metal ions can cause it to decompose uncontrollably, resulting in uneven bleaching and even damage to the fabric. This is where Disodium Hydrogen Phosphate Dodecahydrate comes into play. It acts as a precise “regulator,” stabilizing the solution's pH value within the weakly alkaline range of 8.8–9.2. In this environment, hydrogen peroxide can release oxygen steadily, uniformly removing pigments and impurities from the fabric, resulting in whiter and softer fabric after bleaching, laying a solid foundation for subsequent dyeing. Data shows that after using it, the tensile strength of fabrics in the hydrogen peroxide bleaching process can be improved by 15%, and the uneven bleaching rate can be reduced to below 2%.
2. Strengthening fibers and improving fabric quality
In the production of artificial silk, Disodium Hydrogen Phosphate Dodecahydrate transforms into a “strengthening agent.” When added as a filler to the spinning solution, it binds tightly with cellulose molecules, effectively “energizing” the fibers. Rayon treated in this manner exhibits significantly improved strength and elasticity, resulting in fabrics that are more comfortable to the touch and more durable. For example, adding 2% of this substance can increase the elastic modulus of rayon by 30%, meeting the quality requirements for high-end fabrics.
3. Enhancing dyeing for longer-lasting color
During the dyeing process, Disodium Hydrogen Phosphate Dodecahydrate is equally indispensable. It acts as a mordant and dispersant, helping dyes adhere evenly to the fiber surface and preventing dye precipitation and color spots. Whether using reactive dyes or acid dyes, with its assistance, colors can be better fixed, making the fabric's colors more vibrant and long-lasting. It acts like a “bridge” between the dye and the fiber, securely “locking” the color onto the fabric.
4. Environmentally friendly and cost-effective, with broad application prospects
In addition to its powerful functionality, Disodium Hydrogen Phosphate Dodecahydrate offers numerous advantages. When decomposed, it produces harmless phosphates and sodium ions, making it environmentally friendly and compliant with current environmental standards. Moreover, its raw materials are readily available, production costs are low, and it is used in small quantities during the dyeing process, typically accounting for 0.5%–2% of the bleaching solution concentration, helping businesses save significant costs.
Currently, there is high demand for it in the Asia-Pacific region, particularly in China, accounting for 58% of global consumption. As the textile industry continues to develop, its application in the dyeing industry will become increasingly widespread, continuing to contribute to our lives and the textile industry.

disodium hydrogen phosphate dodecahydrate molecular weight
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disodium hydrogen phosphate
disodium hydrogen phosphate dodecahydrate synonyms
disodium hydrogen orthophosphate dodecahydrate
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sodium dihydrogen phosphate dodecahydrate
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disodium hydrogen phosphate dihydrate synonym