Polyurea compositions and methods of use thereof
A composition, polyoxymethylene technology, applied in the directions of polyurea/polyurethane adhesives, chemical instruments and methods, polyurea/polyurethane coatings, etc.
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Embodiment 1
[0222] Polyoxymethylene polyol
[0223] Thiodiglycol (1833g), p-formaldehyde (95% purity) (360g), AMBERLYST TM 15 (319 g, obtained from Dow Chemical Company) and toluene (1000 mL) were charged into a 5 L 4 neck round bottom flask. The flask was equipped with a heating mantle, thermocouple, temperature controller and fitted with a reflux condenser, dropping funnel and a Dean-Stark adapter for nitrogen positive pressure inlet. The reaction was stirred under nitrogen, heated to 118 °C and held at 118 °C for approximately 7 h. During this period, the collected water was periodically removed from the Dean-Stark adapter. The reaction mixture was then cooled to room temperature and filtered through a coarse fused Buchner funnel (600 mL volume) with 9.0 cm diameter Whatman GF / A filter paper on a frit. The flask and filter cake were washed with 500 mL of toluene. Obtain filtrate. The filtrate was then vacuum dried using a 2L round bottom flask (rotary evaporator, 7 torr final va...
Embodiment 2
[0225] H 12 MDI-terminated polyoxymethylene-isocyanate prepolymer
[0226] The thiodiethylene glycol polyoxymethylene polyol (450 g) of Example 1 was charged into a 1000 mL 4-neck round bottom flask. The flask was equipped with a heating mantle, thermocouple, temperature controller, inlet to provide a positive pressure of nitrogen and a mechanical stirrer (PTFE paddle and bearing). The polyoxymethylene polyol was stirred and heated to 76.6°C (170°F) at about 200rpm, then added W(H 12 MDI) (99.5g) and a solution (5.50g) of 0.01% dibutyltin dilaurate dissolved in methyl ethyl ketone. The reaction mixture was maintained at 76.6 °C for 7 h and then cooled to room temperature. A solution of 1% benzyl chloride dissolved in methyl ethyl ketone (5.50 g) was then added to the reaction mixture. The isocyanate content of the formed thiodiglycol polyoxymethylene-isocyanate prepolymer was 3.73% and the viscosity was 356 poise.
Embodiment 3
[0228] HDI-uretdione terminated polyoxymethylene-isocyanate prepolymer
[0229] The thiodiethylene glycol polyoxymethylene polyol (101 g) of Example 1 was charged into a 500 mL 4-neck round bottom flask. The flask was equipped with a heating mantle, thermocouple, temperature controller, inlet to provide a positive pressure of nitrogen and a mechanical stirrer (PTFE paddle and bearing). The polyoxymethylene polyol was stirred and heated to 76.6°C (170°F) at about 200rpm, then added XP-2730 (HDI-uretdione aliphatic polyisocyanate) (33.4 g) and a solution of 0.01% dibutyltin dilaurate dissolved in methyl ethyl ketone (1.4 g). The reaction mixture was maintained at 76.6 °C for 7 h and then cooled to room temperature. A solution of 1% benzyl chloride dissolved in methyl ethyl ketone (1.4 g) was then added to the reaction mixture. The resulting prepolymer had an isocyanate content of 3.41% and a viscosity of 695 poise.
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