Definition And Expression Of Sodium Tripolyphosphate
May 24, 2021
Sodium tripolyphosphate is a kind of amorphous water soluble strip polyphosphate. It stops at both sides with na2po4, chemical equation na5p3o10 and relative molecular weight of 367.86. It is commonly used in food, which is used as water maintenance agent, bread improver, pH conditioner and antioxidant of metal materials.
Sodium tripolyphosphate is also known as tripetamipine. There are no water and hexahydrate, which is a condensation reaction polyphosphate with network structure.
No water was divided into high temperature type (type I) and ultra low temperature type (type II). Milky white crystalline or crystalline powder. The molecular weight of the relative molecule is 367.86, the density is 2.49, and the solution point is 662 ℃. Soluble strong electrolyte (14.5g/100g at 25 ℃, 23.20g/100g at 80 ℃). The solution is weak alkaline, and the pH of 1% solution is 9.7. In the solution, the reaction will be hydrolyzed slowly to form pyrophosphate or orthophosphate. It has complex effect on alkali metal and heavy metal ions, and can soften water treatment. It also has the ability of ion exchange method, which can make the mixture into water solution and has strong dispersibility. The type I is more rapid than type II, so type II is also called slow hydrolysis reaction type. The type II changed to type I at 417 ℃.
The hexahydrate na5p3o10 · 6H2O is a triaxial orthogonal and crystal structure milky white prism crystal, which can be weathered with a density of 1.786. The solution point is 53 ℃, and the water is dissolved. The product is degradable during the whole process of processing and hardening. Even if the sealing property is, it can be dissolved to be dipetamipine at indoor temperature. The product can not be stored and now it is ready for use.
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