Gantrade’s GCLink P-series is a family of specialty oligomeric polyether diamine curatives based on the p-aminobenzoate ester. In polyureas, they show excellent dynamic properties, resiliency, high tensile strength, and abrasion resistance.
These aromatic diamine-terminated polyethers are designed to be formulated with monomeric isocyanates.
Because of their reduced amine reactivity and liquid or low melting nature, these oligomeric diamines enable significant processing advantages with MDI and TDI systems, including a processing window at lower temperatures and lower shrink values due to lower cure temperatures. Their built-in flexibility and toughness, water, chemical and abrasion resistance, and excellent dynamic properties provide polyureas with superior performance characteristics. In addition, our oligomeric diamines function as epoxy hardeners.
Typical applications for the GCLink P-series include cast elastomers, protective coatings, energy absorption, adhesives, sealants, and polyurea spray systems. The GCLink P-series family of diamines are the preferred curatives in the design of polyurea ballistic armor and blast mitigation coatings.
Gantrade’s GCLink P-series is a family of diamines based on the p-aminobenzoate esters of varying molecular weight grades of PTMEG:
GCLink 740 is a monomeric diamine based on the p-aminobenzoate ester of 1,3-propanediol. The variant GCLink 740M is FDA compliant for direct contact with dry foods.
With MDIs, including the carbodiimide-modified MDIs, formulators may customize polyurea properties by varying the diamine molecular weight, stoichiometry (NCO index), and isocyanate chemistry. Durometer values can be achieved from below 80A to above 60D.
The data below compares the properties of p-aminobenzoate-capped PTMEG 650, 1000, and 2000 polyureas cured with a multifunctional carbodiimide-modified MDI, MM103. These systems exhibit a unique combination of high tensile strengths, elongations, and tear resistance over a wide range of hardness.
|Reaction with MM103||GCLink P-650||GCLink P-1000||
|Durometer Hardness: Shore A/D||63D||95A||85A|
|100% Modulus: psi||3170||1100||550|
|300% Modulus: psi||6150||1850||780|
|Ultimate Tensile: psi||7300||8000||6000|
|Die C Tear, pli||1016||373||280|
|Split Tear, pli||2302||1906||150|
Tabor Abrasion, 1000 cycles
|12 mg.||10 mg.||5 mg.|
The sales specifications for the GCLink P-series diamines are provided below. Total Equivalent Weight should be used in calculating stoichiometries, since mono-hydroxy fractions exist.
|Specifications||GCLink P-650||GCLink P-1000||GCLink P-2000||GCLink 740M|
|Appearance at RT||Amber Liquid||Amber Liquid||Yellow Wax||Off-white Powder|
Viscosity, mPa.s, 30 °C
|Total Equivalent Weight||380-450||550-600||1050-1150|
For more information on the GCLink family of curatives, contact Gantrade today. Gantrade provides experienced technical support, working with our customers to solve problems and to develop unique products.