Publish Time: 2023-01-04 Origin: Site
STPP, an inorganic compound with the chemical formula Na5P3O10, is an amorphous water-soluble linear polyphosphate, commonly used in food as a moisture retention agent, quality improver, pH adjuster, and metal chelating agent.
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The information on STPP
The function of STPP
Sodium tripolyphosphate has two crystalline states, type I (high-temperature type) and type II (low-temperature type). The difference is that the bond lengths and bond angles of the two are different, and the chemical properties of the two are the same, but the thermal stability and hygroscopicity of type I are higher than that of type II.
Sodium tripolyphosphate has the functions of chelation, suspension, dispersion, gum solubility, emulsification, pH buffer, etc. It can be used as the main auxiliary of synthetic detergent, industrial water softener, tanning pre-tanning agent, dyeing auxiliary, organic synthesis catalyst, pharmaceutical industry dispersant, food additive, etc. Except for the export of STPP, domestic STPP consumption is mainly concentrated in the detergent industry, food, ceramics, etc.
Sodium tripolyphosphate is used for the curing of raw meat of ham. For every 100kg of meat, add 2.2kg of No.3 mixed salt (91.65% refined salt, 8% sugar, 0.35% sodium nitrite) and 85g sodium tripolyphosphate, mix well, and curing in cold storage at 0~4℃ for 48~72h, with good effect. Used for canned fava beans production, can make bean skin soften. Many fruits and vegetables have tough outer skin, with the maturity of fruits and vegetables, the tougher the outer skin, in the fruit and vegetable processing hot blanching or soaking with water, adding polyphosphate, can complex calcium, thereby reducing the toughness of the outer skin
Chelating effect on heavy metal ions: In the washing process, heavy metal ions in water can combine with detergent molecules to form insoluble metal salts, reducing the washing ability or even completely losing its effect. Therefore, the need to add a chelating agent to the detergent, chelating agent can make the heavy metal ions contained in the water into harmless substances. Sodium tripolyphosphate has a strong chelating effect on heavy metal ions, which can close them and eliminate their adverse effects on washing. In addition, it can capture various metal components contained in the dirt and play a role in dissociating the dirt during the washing process, and can also be used as a soap booster to prevent soap grease precipitation and frosting
Second, the role of the dirt as a decoupling, emulsification, and dispersion: dirt often contains human secretions (mainly proteins and fatty substances), as well as external sand and dust. Sodium tripolyphosphate can dissolve and dissolve the proteins in the dirt, thus making it a de-stick. Promotes fat emulsification; disperses solid dirt; has a strong emulsifying effect on lubricants and fats, and can be used to adjust the PH value of buffer soap.
Third, it has the effect of preventing caking on detergents: powdered synthetic detergents are hygroscopic and will cake if stored in places with high humidity. Caking detergent is very inconvenient to use. In contrast, sodium tripolyphosphate forms a hexahydrate after absorbing water and dries dry. When a large amount of detergent is used in the formulation, it prevents caking due to moisture absorption and keeps the synthetic detergent dry and granular.
Fourth, STPP has a large alkaline buffering effect: it keeps the pH of the detergent solution at about 9.4, thus facilitating the removal of acidic dirt.
Sodium tripolyphosphate can be divided into white powdered anhydrous gypsum and hexahedrons matter crystallized in right-angled parallel hexahedra by structure and shape, which can be divided into type I and type II. Industrial sodium tripolyphosphate is a mixture of type I and type II. type I dissolves quickly, hydrates to form hexahydrates with a large thermal effect, and is prone to moisture absorption and caking in the atmosphere. Type II is slow to absorb moisture, and not easy to clump. Therefore, the content of type I in sodium tripolyphosphate for detergents should not be too high, generally controlled at 10 ~ 30%.
Nanjing Jiayi Sunway Chemical Co., Ltd. conducts many tests on STPP for connection before they leave the factory, and the quality qualification rate is guaranteed. If you are in STPP, you can consider our cost-effective products.