三聚磷酸钠Sodium tripolyphosphate(STPP)
别名：磷酸五钠
化学式： Na5P3O10
分子量： 367.86
执行标准：GB/T9983-2004（工业级）
QB1034-91（食品级）
性状：
白色粉末,熔点622℃,易溶于水,对钙镁等金属离子有显著的螯合能力,能软化硬水,使悬浮液变成溶液,有弱碱性,无腐蚀性,是一种无机物表面活性剂,对润滑油和脂肪有强烈的乳化作用,堆密度通常分为低密度0.35-0.5g/cm3,中密度0.51-0.65g/cm3,高密度0.66-0.9g/cm3;五钠有I型(高温型)和II型(低温型)两种结晶形态,二者化学性质相同,区别在于热稳定性和吸湿性I型高于II型,同时二者的溶解度,溶解时水合热量都不同。
用途：
用作合成洗涤剂的主要助剂,肥皂增效剂,制革予鞣剂,工业用水的软水剂;油漆,高龄土,氧化镁,碳酸钙钻井泥浆等悬浮液处理的有效散剂;造纸用作防油污剂;食品工业中用于罐头,果汁饮料,奶制品,豆乳等的品质改良剂,主要供火腿罐头嫩化,蚕豆罐头中使豆皮软化,亦可用作软化剂和增稠剂。
包装与贮运：
内塑外编，每袋净重25、50、1000kg。防潮、防水、不可露天堆放。
技术指标：
|
序号 |
指标名称 |
工业级 |
食品级 |
|
1 |
主含量（以Na5P3O10计）%≥ |
94.0 |
95.0 |
|
2 |
***%≥ |
57.0 |
57.0 |
|
3 |
水不溶物%≤ |
0.1 |
0.05 |
|
4 |
铁（Fe）%≤ |
0.01 |
0.01 |
|
5 |
PH值（1%水溶物） |
9.2-10.0 |
9.5-10.0 |
|
6 |
***(以Pb计) %≤ |
|
0.001 |
|
7 |
***(以As计) %≤ |
|
0.0003 |
|
8 |
氟化物(以F计) %≤ |
|
0.003 |
|
9 |
粒度
普通粉末
细粉 |
|
|
|
10 |
白度%≥ |
90.0 |
90.0 |
Sodium tripolyphosphate（STPP）
Byname:Pent-sodium Phosphate
Molecular formula: Na5P3O10
Molecular Weight: 367.86
Standard executed : GB/T9983-2004(technical grade)
QB1034-91(food grade)
CAS Number: 7758-29-4
Properties:
White powder; Melting point 622°C; Easily soluble in water; It has got salient chelating capacity to i*** of Ca and Mg etc. and can soften hard water to make suspension solution become into clear solution; It has got weak alkalinity but no corrosiveness. It is a surfactant, and has got outstanding emulsification to lubricants and fat. It has different bulk density, i.e. low density 0.35-0.5g/cm3, medium density 0.51-0.65g/cm3 and high density 0.66-0.9g/cm3. This product has two crystalline forms, namely Type I (high temperature type) and Type II (low temperature type). The chemical properties of the two types are the same, and the difference between them lies in the thermostability, hygroscopicity, solubility and hydration heat when dissolving .
Uses:
Used as one of the main auxiliaries for synthetic detergent, synergist for soap; water softener, tanning agent for leather making, auxiliary for dyeing; As an effective dispersion agent for suspension soluti*** of coatings, kaolin, magnesium oxide, calcium carbonate and drilling mud etc.; As an oil contamination resistance agent in paper production. In foodstuff industry it is used as quality improver in the process of canned food, fruit juice drinks, foodstuffs from milk or soybeans. It may tender the meat in canned ham and soften the skin of horse bean in canned horse bean. It may also serves as a softener or densifier in foodstuff industry.