2-羥基瞵酰基乙酸（HPAA）
2-Hydroxyphosphonocarboxylic Acid
別名： 膦酰基羥基乙酸、羥基磷酰乙酸、羥基膦乙酸、HPA
分子式： C2H5O6P 相對分子質量： 156
Molecular formula: C2H5O6P Relative molecular weight: 156
CAS No. 23783-26-8
結構式：
Structural formula:
1、產品性能Product performance
本產品化學穩定性好，抗酸堿干擾性強，不易水解，使用安全可靠，無毒無污染。分子結構中含有羥基、羧基、膦酸基，與傳統有機膦比較，有較高的阻垢分散效果。本品能提高鋅離子的溶解度，具有*的碳鋼緩蝕作用。HPAA緩蝕性能比HEDP、EDTMP高5～8倍，常用來作為碳鋼材質的緩蝕劑。HPAA與低分子量的聚合物一起組成的有機緩蝕阻垢劑性能優良。
HPAA is chemically stable, hard to be destroyed by acid or alkali, hard to be hydrolyzed, safety in use, no toxicity, no pollution. With hydroxyl, carboxyl and phosphonyl in molecular structure, it has better effect of anti-scale and dispersion than traditional organic phosphorus. HPAA can improve zinc solubility and has very strong corrosion inhibition on carbon steel. Its corrosion inhibition ability is 5-8 times better than that of HEDP and EDTMP, hence it is often taken as corrosion inhibitor on carbon steel materials. When built with low molecular polymers, its corrosion inhibition effect is even better.
2、質量指標 Quality index
| 指 標 名 稱 Index Name | 指 標 Index |
| 外觀 Appearance | 深紅棕色液體 Dark reddish brown fluid |
| 固含量 % ≥ Solid content % ≥ | 50.0 |
| 亞磷酸（以PO33-計）含量％ ≤ Phosphorous acid （as PO33-） % ≤ | 3.0 |
| 磷酸（以PO43-計）含量％ ≤ Phosphoric acid （asPO43-）% ≤ | 1.5 |
| 有機膦（以PO43-計）% ≥ Organic phosphorus （as PO43-） % ≥ | 25.0 |
| PH值（1％水溶液） ≤ Ph value （1% water solution） ≤ | 3.5±1.0 |
| 密度：（20℃）g/cm3 ≥ Density:（20℃）g/cm3 ≥ | 1.28 |
3、應用濃度與使用方法 Application concentration and method
HPAA主要用做金屬的陰極緩蝕劑，廣泛用于鋼鐵、石化、電力、醫藥等行業的循環冷卻水系統的緩蝕阻垢，一般使用濃度為適合用作我國南方低硬度、易腐蝕水質的緩蝕劑，HPAA與鋅鹽復配效果更佳。
HPAA is mainly used as cathode corrosion inhibitor in oilfield refill water system in fields such as steel & iron, petrochemical, power plant and medical industries. The normal concentration is to suit the water in low hardness and corrosive quality of Southern part of china. When built with zinc salt, the effect is even better.
4、包裝與貯存 Packing and storage
HPAA用塑料桶包裝，每桶30kg或250kg。貯于室內陰涼處，貯存期為十四個月。Pack in 30kg or 250kg plastic drum. Be stored for 14 months in room shady place.
5、安全與防護 Safety and Protection
本產品為酸性液體，應避免與皮膚、眼睛等接觸，一旦濺到身上，應立即用大量清水沖洗。
Acidity. Avoid contact with eye and skin, once contacted, flush with water.
