Tri-iso distributes a wide range of aliphatic polyamines that allow formulators to produce high quality polyureas. Polyamines contain reactive amine (NH) groups which react with isocyanate (NCO) groups on isocyanates to form polyureas. T
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here are several key characteristics which define what performance properties a given amine will impart in a given polyurea elastomer. These characteristics include: the type of polyamine selected (aliphatic or aromatic), the amine value (NH value), Amine equivalent weight, molecular weight, and the functionality of the polyamine. Aliphatic polyamines form light stable polyureas that are water-white clear, whereas aromatic polyamines form polyureas that are not UV stable and discolor, but are more chemically resistant and offer enhanced thermal performance.
Primary amines react much faster than secondary amines (especially sterically-hindered secondary amines).
Amine number (NH ) is the measure of the amine group content of gram of polyamine. Amine value is measured by titrating a known mass of polyamine against hydrochloric acid, and is expressed as mg KOH/g. Lower amine values indicates lower amine content and a higher molecular weight for the overall polyamine.
Amine equivalent weight is the number of grams of a given product that contains one equivalent of amine groups (NH). Equivalent weight = 56100/Amine
Molecular Weight is determined by multiplying the equivalent weight by the amine functionality
Amine functionality refers to the number of NH groups per molecule. Increasing the number of NH groups results in greater crosslinking. Greater crosslinking yields stiffer, harder products with enhanced chemical and thermal resistance.
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