Amine value
Amine value is a measure of the nitrogen content of an organic molecule.[1] Although there are similarities with the method it is not the same as an acid value. Specifically it is usually used to measure the amine content of amine functional compounds.[2] There are a number of ASTM analytical test methods to determine amine value. It may be defined as: the number of milligrams of KOH equivalent to one gram of hardener resin.[3] The units are thus mg KOH/g.[4] A number of states in the USA have adopted their own test methods but they are based on ASTM methods.[5]
List of ASTM methods
- ASTM D2073 - This is a potentiometric method.[6]
- ASTM D2074-07
- ASTM D2896 - potentiometric method with perchloric acid[7]
- ASTM D6979-03
First principles
The amine value is useful in helping determine the correct stoichiometry of a two component amine cure epoxy resin system.[8][9][10]
It is the number of Nitrogens x 56.1 (Mwt of KOH) x 1000 (convert to milligrams) divided by Molecular weight. So using Tetraethylenepentamine (TEPA) as an example: Mwt = 189, number of nitrogen atoms = 5
So 5 x 1000 x 56.1/189 = 1484. So the TEPA Amine Value = 1484
Other amines
All numbers are in units of mg KOH/g.
- Ethylenediamine. Amine value = 1870
- Diethylenetriamine. Amine value = 1634
- Triethylenetetramine. Amine value = 1537
- Aminoethylpiperazine. Amine value = 1305
- Isophorone diamine. Amine value = 660
- Hexamethylenediamine. Amine value = 967
- 1,2-Diaminocyclohexane. Amine value = 984
- 1,3-BAC. Amine value = 790
- 2-Methylpentamethylenediamine -Dytek A. Amine value = 967
- m-Xylylenediamine -MXDA. Amine value = 825
See also
References
- ↑ Lee, Henry (1967). Handbook of epoxy resins. Kris Neville ([2nd, expanded work] ed.). New York: McGraw-Hill. ISBN 0-07-036997-6. OCLC 311631322. Search this book on
- ↑ "Amines | Introduction to Chemistry". courses.lumenlearning.com. Retrieved 2021-07-22.
- ↑ Epoxy resin technology. Paul F. Bruins, Polytechnic Institute of Brooklyn. New York: Interscience Publishers. 1968. ISBN 0-470-11390-1. OCLC 182890. Search this book on
- ↑ Waterborne coatings and additives. Karsa, D. R., Davies, W. D., Royal Society of Chemistry (Great Britain), Society of Chemical Industry (Great Britain). Cambridge, UK: Royal Society of Chemistry. 1995. ISBN 0-85404-740-9. OCLC 33164476. Search this book on
- ↑ "DETERMINING EPOXIDE EQUIVALENT AND AMINE VALUE OF RESINS" (PDF). Texas.gov. Unknown parameter
|url-status=ignored (help) - ↑ "ASTM D2073 - Standard Test Methods for Total, Primary, Secondary, and Tertiary Amine Values of Fatty Amines, Amidoamines, and Diamines by Referee Potentiometric Method | Engineering360". standards.globalspec.com. Retrieved 2021-07-22.
- ↑ "Epikure 3378 tds" (PDF). Peninsula Polymers. Unknown parameter
|url-status=ignored (help) - ↑ Flick, Ernest W. (1993). Epoxy resins, curing agents, compounds, and modifiers : an industrial guide. Park Ridge, NJ. ISBN 978-0-8155-1708-5. OCLC 915134542. Search this book on
- ↑ Howarth, Graham (1995-01-01). "The use of water‐based epoxies for anti‐corrosive primers". Pigment & Resin Technology. 24 (6): 3–6. doi:10.1108/eb043156. ISSN 0369-9420.
- ↑ Howarth G.A "Synthesis of a legislation compliant corrosion protection coating system based on urethane, oxazolidine and waterborne epoxy technology" Master of Science Thesis April 1997 Imperial College London
External links
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