Английская Википедия:Amine value
In organic chemistry, amine value is a measure of the nitrogen content of an organic molecule.[1] Specifically, it is usually used to measure the amine content of amine functional compounds.[2] It may be defined as the number of milligrams of potassium hydroxide (KOH) equivalent to one gram of epoxy hardener resin. The units are thus mg KOH/g.
List of ASTM methods
There are a number of ASTM analytical test methods to determine amine value. A number of states in the United States have adopted their own test methods but they are based on ASTM methods.[3] Although there are similarities with the method it is not the same as an acid value.
- ASTM D2073 - This is a potentiometric method.[4]
- ASTM D2074-07
- ASTM D2896 - potentiometric method with perchloric acid.[5]
- 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.[6][7][8]
It is the number of Nitrogens x 56.1 (Mwt of KOH) x 1000 (convert to milligrams) divided by molecular mass of the amine functional compound. 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 Amine Value of TEPA = 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
- Acid value
- Bromine number
- Epoxy value
- Hydroxyl value
- Iodine value
- Peroxide value
- Saponification value
References
Further reading
External links
- ↑ Шаблон:Cite book
- ↑ Howarth, GA. Master of Science thesis "The synthesis of a legislation compliant corrosion protection paint system, based on waterborne epoxy, urethane and oxazolidine technology". April 1997 Imperial College London Chapter 1.9.5 page 29
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Howarth, GA. Master of Science thesis "The synthesis of a legislation compliant corrosion protection paint system, based on waterborne epoxy, urethane and oxazolidine technology". April 1997 Imperial College London Chapter 3.2.3 Amine stoichiometry page 56
