Flow additives for polyurethane systems
A polyurethane system technology, applied in flow additives, improving the flow field of two-component polyurethane system
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Embodiment 1
[0019] Example 1 Polyesters are prepared for use as part of solution-based polyurethane adhesives that can be applied at high solids concentrations.
[0020] 1. Diethylene glycol (343 lbs, 156kg), phthalic anhydride (440 lbs, 200kg) and 1 lb (454g) of Fascat9100 (C 4 h 9 SnO(OH), catalyst from Arkema) was charged to a 100 gallon (379 L) stainless steel reactor equipped with an enveloped fractionating column and condenser.
[0021] 2. The heterogeneous mixture was charged to 100-130°C and held at 120-130°C for 0.25-0.5 hours.
[0022] 3. The resin mixture was gradually heated to 225°C. At about 190°C, water began to distill out. After collecting 90-95% of the theoretical amount of water, samples were periodically drawn from the reactor for viscosity (100°C cone and plate) and acid value tests. When the acid value is less than 20 mg KOH / g sample, apply vacuum and continue distillation under reduced pressure. The initial pressure was set at 450-500 Torr. The vacuum was ...
Embodiment 2
[0024] Preparation of Example 2 Isocyanate Terminated Prepolymer
[0025] The jacket on the 5 gallon glass lined reactor was heated to 50°C. Molten ISONATE 125M (33.5 lbs, 15.2 kg) was charged to the reactor keeping the temperature above 50°C to prevent it from freezing. The reaction mixture was continuously stirred and kept under a dry nitrogen atmosphere. VORANOL CP450 (1.25 lbs, 0.57 kg) was added followed by 425 molar weight polypropylene glycol. The polyol is added at a rate that maintains the temperature in the reactor above 50°C. The reactor was heated and maintained at 60-65°C for 30 minutes. The temperature was increased to 80°C and held at 80-90°C for 1 hour. The reactor was cooled to 60°C, and 9 pounds (4.1 kg) of ethyl acetate and 8.2 grams of benzoyl chloride were added. Product analysis showed: 85.7% solids, 12.8% NCO, viscosity 394 mPas.
Embodiment 3
[0026] Example 3 High-speed lamination without additives
[0027] Lamination was performed on an Egan laminator. Drying oven zones 1-3 were set at 180°F (82°C), 170°F (77°C) and 180°F (82°C). The roll temperature was 180°F (82°C). Gravure cylinders with quadrangular cells embossed at 130-180 lines / inch (51-71 lines / cm) were used. The adhesives tested were prepared by mixing polyester (Example 1) with DESMODUR L-75 (Bayer Corporation) or the isocyanate-terminated prepolymer described in Example 2 (100 / 18 parts by weight) . The solution was diluted to the target percent solids with anhydrous ethyl acetate. Table 1 shows the binder, binder viscosity on solid run, additives, film, gravure cylinder used and coating weight applied. Typically, when the adhesive is first applied, the adhesive has a hazy appearance due to cell pattern transfer and changes in adhesive thickness. As the adhesive cures, the pressure of the film winding on the roll helps smooth the adhesive and parti...
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Abstract
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