Tetrapotassium pyrophosphate
Product name: Potassium pyrophosphate
Molecular formula: K4P2O7
Molecular weight:330.34
CAS number:7320-34-5
EINECS:230-785-7
Customs code:28353990
Grade: food grade/industrial grade/electroplating grade
Tetrapotassium pyrophosphate has excellent complexing ability and can form stable complexes with Ca2+ and Mg2+ in hard water to soften hard water and improve Washing ability, remove dirt. It can also form a protective film on the surface of iron, lead, zinc and other metals to prevent corrosion on the surface of iron, lead, zinc and other metals. Pyrophosphate ions (P2O74-) have strong dispersing ability for finely dispersed solids and can promote the uniform mixing of fine and trace substances. It has stable pH buffering ability and can maintain the pH value of the solution for a long time.
Introduction to application fields and uses
Electroplating grade tetrapotassium pyrophosphate is used for cyanide-free electroplating. As a complexing agent for electroplating, it is also used for surface treatment, that is, as a pretreatment agent and Pyrophosphate plating solution.
Industrial grade tetrapotassium pyrophosphate is widely used in paints and coatings, detergents, boiler descaling, oil well drilling, textile printing and dyeing auxiliaries and other fields. It is used in industry Used as high-end detergents, cleaning agents, dispersants, buffers, etc., for the preparation of detergent components for clothing, metal surface cleaners and bottle detergent components, and additives for various detergents. It is used as clay dispersion in the ceramic industry. Agent, dispersant and buffer for pigments and dyes, used in the bleaching and dyeing industry to remove a small amount of ferric ions in water to improve the quality of bleaching and dyeing.
Food grade tetrapotassium pyrophosphate is used in food processing as food additives, milk thickeners, texture improvers, chelating agents, quality improvers, etc. In the food industry, it is used as an emulsifier, chelating agent, and raw material for alkaline aqueous agents used in flour products; to prevent discoloration of canned fruits; to increase the expansion of ice cream and the yield of ham and sausage; to enhance the water-holding capacity of fish, improve the taste of noodles, and increase the yield. , prevent cheese from aging, etc.
As a complexing agent in cyanide-free electroplating
1. It has excellent complexing ability for multivalent cations such as Cu2+, Sn2+, Ag+, Zn2+, Ni2+, Cr3+, Ca2+, Mg2+;
2. Add 2.5 (ml) m carbon black in 1% silver nitrate solution dropwise to 100ml of 1% potassium pyrophosphate solution. The white precipitate produced can be quickly complexed into a clear solution.
3. The plating solution has excellent polarization ability and current dispersion ability. The prepared plating solution can be electroplated directly without going through the electrolysis process. During electroplating, the plating speed is fast, the plating layer is uniform, the crystal structure is regular, fine, dense and non-porous. Liquid stability, strong anti-interference ability, and simple maintenance.
4. It has strong dispersing ability for finely dispersed solid substances;
5. Stable pH buffering capacity.
Determination of complexing ability
Weigh 1.000g potassium pyrophosphate, dissolve it in distilled water and adjust the volume to 100ml, make 100ml of 1% solution, add 1% silver nitrate dropwise into the 100ml solution Solution, stir until the white precipitate produced cannot be completely complexed. Record the amount (ml) of 1% silver nitrate solution added dropwise, which is the complexing ability index of potassium pyrophosphate.
