Hydrolyzed polymaleic anhydride HPMA
Alias: Polymaleic acid, Polymaleic acid
CAS No. 26099-09-02
Structural formula
Ⅰ. Performance and use
HPMA general relative molecular weight of 400 ~ 800, non-toxic, easily soluble in water, high chemical and thermal stability, decomposition temperature in 330℃ above. HPMA is suitable for alkaline environment. HPMA is widely used in seawater desalination flash evaporator, low pressure boiler and industrial circulating cooling water due to its excellent scale inhibition and high temperature resistance. In addition, HPMA has a certain corrosion inhibition effect, and zinc salt compound corrosion inhibition effect is better.
HPMA can also be used as cement admixture, saline soil improver.
Ⅱ.Technical indicators
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Item
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Indicators
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Pale yellow to reddish brown transparent liquid
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Solid content/%
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≥50.0
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pH(1% Aqueous solution)
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2.0～3.0
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Density(20℃)/g·cm-3
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1.22-1.25
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Bromine number/mg·g-1
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≤50.0
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Ⅲ. Method of use
When HPMA is used alone, the general usage concentration is 1-15mg/L, and it is often combined with organic phosphonate. It is used for the treatment of circulating cooling water and the in-furnace treatment of low-pressure boiler. It has a good effect on inhibiting scale formation and stripping old scale, and the scale inhibition rate can reach 98%. HPMA combined with zinc salt can effectively prevent corrosion of carbon steel.
Ⅳ. Safety and protection
HPMA is acidic, pay attention to labor protection when operating, should avoid contact with the skin, eyes, etc., after contact with plenty of water rinse.
Ⅴ. Packaging and storage
HPMA is packaged in plastic drums of 25kg each or as determined by the user. The storage period is twelve months.
