Alkylated 4-aminobenzyl-4-aminocyclohexane
A technology of alkyl group and curing agent, applied in the field of aliphatic secondary diamine curing agent
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Embodiment 1
[0042] Example 1: Preparation of 4-aminobenzyl-4-aminocyclohexane reduction alkylate
[0043] 179.6 grams (g) of 4-aminobenzyl-4-aminocyclohexane was placed in a 1 liter Parr reactor followed by 2.6 g of palladium on carbon (5% Pd / C) catalyst , 2.6 grams of platinum on carbon (5% Pt / C) catalyst and 525 grams of acetone (Aldrich #179124). The molar ratio of acetone to amine is 1.2 / 1. The reactor was sealed and then filled with N 2 Blow several times to remove trapped air. then use H 2 Purge and leak test at 120 psi gauge (psig). The agitation rate was set to 800-1000 revolutions per minute (rpm), and the temperature of the vessel was ramped to 60°C while maintaining 300 psig of hydrogen. These conditions were held constant until the rate at which hydrogen gas was absorbed into the reaction from the 1 liter hydrogen ballast tank dropped to less than 1 psig / minute. The temperature was then raised to 120°C and the hydrogen pressure was increased to 500-800 psig and held for ...
Embodiment 2
[0045] Example 2: Preparation of 4-aminobenzyl-4-aminocyclohexane reduction alkylate
[0046] 224.3 g of 4-aminobenzyl-4-aminocyclohexane was placed in a 1 liter Parr reactor followed by 1.0 g of Pd / C catalyst, 1.0 g of Pt / C catalyst, 1.0 g of Pt / S / C ( platinum sulfur on carbon catalyst), and 150.7 grams of acetone (Aldrich #179124). The molar ratio of acetone to amine is 2.5 / 1. The reactor was sealed and then filled with N 2 Blow several times to remove trapped air. then use H 2 Purge and leak check at 120 psig. The agitation rate was set to 800-1000 rpm and the temperature of the vessel was raised to 60°C while maintaining 300 psig of hydrogen. These conditions were held constant until the rate at which hydrogen was drawn into the reaction from the 1 liter hydrogen ballast tank dropped to less than 1 psig / min. The temperature was then raised to 120°C and the hydrogen pressure was increased to 500-800 psig and held for 0.5-1.5 hours until the reaction was complete. The...
Embodiment 3
[0048] Example 3: Preparation of polyurea coatings containing alkylated 4-aminobenzyl-4-aminocyclohexane (di-isopropyl reduced alkylate)
[0049] A polyurea elastomeric spray coating containing the reduced alkylate of Example 2 was prepared in the following manner. First, by mixing 42% diisopropyl 4-aminobenzyl-4-aminocyclohexane with 58% JEFFAMINE D-2000 (supplied by Huntsman Corporation) was mixed to prepare the amine resin component (B component). A commercially available 14.5% IPDI quasi-prepolymer (Cap 100 supplied by Specialty Products, Inc. TM ) as the isocyanate component (A component). Add both components A and B to the Quadro In a double-barrelpneumatic joint-filler gun of a Mixer static mixing head (8.7 / 24 x 161 millimeters (mm), supplied by Sulzer Chem Tech). The two components were shot through the gun in a 1:1 volume ratio onto a release liner at a pressure of 60 pounds per square inch (psi). The samples were allowed to cure at ambient conditions for 2 days...
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