乙二胺四甲叉膦酸鈉 edtmps
ethylene diamine tetra (methylene phosphonic acid) sodium
【cas】 1429-50-1
別名：乙二胺四亞甲基膦酸鈉 dequest:2040
分子式 c6h12o12n2p4na8c 相對分子質(zhì)量：612.13
一、性能：
edtmps是含氮有機多元膦酸，屬陰極型緩蝕劑，與無機聚磷酸鹽相比，緩蝕率高3~5倍。能與水混溶，無毒無污染，化學穩(wěn)定性及耐溫性好，在200℃下仍有良好的阻垢效果。edtmps在水溶液中能離解成8個正負離子，因而可以與多個金屬離子螯合，形成多個單體結(jié)構(gòu)大分子網(wǎng)狀絡(luò)合物，松散地分散于水中，使鈣垢正常結(jié)晶被破壞。edtmps對硫酸鈣、硫酸鋇垢的阻垢效果好。
二、質(zhì)量指標 符合hg/t 3538-2003
項 目 指 標
外 觀 黃棕色透明液體
活性組分（以edtmps計）％ ≥ 30.0
有機膦（以po43- 計）% ≥ 10.0
亞磷酸（以po33-計）% ≤ 5.0
磷酸（以po43-計）% ≤ 1.0
ph值（1%水溶液） 9.5-10.5
密度（20℃）g/cm3 ≥ 1.25
氯化物 （以cl-計）% ≤ 3.0
三、應(yīng)用范圍與使用方法
edtmps用于循環(huán)水和鍋爐水的緩蝕阻垢劑、無氰電鍍的絡(luò)合劑、紡織印染行業(yè)螯合劑和氧漂穩(wěn)定劑。在循環(huán)冷卻水中單獨投加時，一般劑量2~10mg/l。edtmps與hpma按1:3比例復(fù)配后，可用于低壓鍋爐爐內(nèi)水處理。edtmps也可與bta、paas、鋅鹽等復(fù)配使用。
四、包裝與貯存
edtmps用塑料桶包裝, 每桶25kg或根據(jù)用戶需要確定。貯于室內(nèi)陰涼處，貯存期十個月。
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ethylene diamine tetra (methylene phosphonic acid) sodium (edtmps)
cas no. 1429-50-1 dequest: 2040
molecular formula: c6h12o12n2p4na8 molecular weight: 612.13
structural formula:
properties:
edtmps is nitrogenous organic polyphosphonic acid, a part of cathodic corrosion inhibitor.its corrosion inhibition is 3~5 times better than that of inorganic polyphosphate. it can be fully dissolved in water, innocuous and none pollution to environment, has good chemical stability and thermal tolerance. it shows excellent scale inhibition ability under temperature 200℃. it can dissociate into 8 positive-negative ions, thus can chelate with many metal ions to form polymer reticulation complex, to destroy the normal crystallization of calcium scale. edtmps shows better antiscale effects to calcium sulfate and barium sulfate.
specification:
itemsindexappearanceclear yellow to umber transparent liquidactive component（edtmps）％ 30.0minorganic phosphonic acid（aspo4 ）％10.0minphosphorous acid（as po3）％5.0maxphosphoric acid （aspo4 ）％1.0maxph（1％ water solution）9.5-10.5density （20℃）g/cm1.25minchloride (as cl)％3.0max
usage:
edtmps can be used as corrosion inhibitor in circulating cool water system and boiler water. it is a chelating agent in non-cyanogen electroplating industry and a water-softening agent in printing & dyeing industry. when used alone, 2~10mg/l is preferred. when built with hpma by ratio etdmp:hpma=1:3, it can be used for low pressure boiler. it can also be built with bta, paas and zinc salt.
package and storage:
normally in 250kg net plastic drum, ibc drum can also be used as required. storage for ten months in room shady and dry place.
keywords: ethylene diamine tetra (methylene phosphonic acid) sodium,edtmps,edtmps china
緩蝕阻垢劑的類別有很多，兼具緩蝕與阻垢功能的產(chǎn)品主要有：
有機磷類阻垢緩蝕劑：如atmp、hedp、dtpmpa、edtmps、hpaa等；
另外少量的聚合物也含有一定的阻垢緩蝕功能，如膦酰基羧酸共聚物、綠色阻垢緩蝕劑pesa、pasp等。
阻垢緩蝕劑主要應(yīng)用于工業(yè)循環(huán)水系統(tǒng)如電廠、鋼鐵廠、化肥廠、油田注水系統(tǒng)等等。一般的終端用戶使用單一藥劑作為阻垢緩蝕劑的不多，要根據(jù)系統(tǒng)情況設(shè)定方案，投加專用的緩蝕阻垢劑。
另外還有很多專用的緩蝕劑，如mbt(銅緩蝕劑）、bta、tta、以及鹽酸酸洗緩蝕劑等。