A kind of low surface tension waterborne polyurethane adhesive and preparation method thereof
A technology of water-based polyurethane and low surface tension, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problem of long synthesis cycle of modified silicone, high technical difficulty, high safety and environmental protection of production equipment stress and other issues
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[0031] The present invention also provides a kind of preparation method of above-mentioned low surface tension waterborne polyurethane adhesive, comprises the steps:
[0032] Step 1. Add glucoside, 2,2-dimethylolpropionic acid and polyol into the reaction kettle, raise the temperature to 110-120°C, and reduce the moisture in the material to 0.05-0.1% by vacuuming , and then lower the temperature to 40-50°C to obtain the first reactant;
[0033]Step 2. Add isocyanate to the first reactant obtained in step 1, raise the temperature to 50-90°C, react for 2-8 hours, and cool down to 40-50°C to obtain the second reactant;
[0034] Step 3. Add a chain extender and 200-500ml of acetone to the second reactant obtained in step 2, raise the temperature to 55-60°C, keep the acetone boiling, continue the reaction for 1-5 hours, and remove the acetone in the system by distillation under reduced pressure. At the same time, drop water to complete the emulsification process, adjust the pH of ...
Embodiment 1
[0039] Step 1. Add 1000g of AEG-12, 26g of 2,2-dimethylolpropionic acid and 780g of PEG-600 into the reaction kettle, raise the temperature to 120°C, and reduce the moisture in the material to 0.05% by vacuuming , and then cooled to 40°C;
[0040] Step 2. Slowly add 640g of MDI into the reactor, raise the temperature to 75°C, and cool down to 40°C after reacting for 6 hours;
[0041] Step 3. Add 7g DETA and 200ml acetone, raise the temperature to 55°C, keep the acetone boiling, after 5 hours of reaction, remove the acetone in the system by distillation under reduced pressure, stir vigorously while distilling and add 2200g water dropwise to complete the emulsification process, use an appropriate amount of three Ethylamine was used to adjust the pH of the system to 7 to obtain an aqueous polyurethane dispersion with a solid content of about 52%.
[0042] Step 4. Add 3g BYK-1785 and 5g Vesmody to the aqueous polyurethane dispersion in sequence TM U605 and 4gKathon TM LXE, di...
Embodiment 2
[0044] Step 1. Add 930g AEG-8, 25g 2,2-dimethylolpropionic acid and 1050g HSH-330 into the reaction kettle, raise the temperature to 120°C, and reduce the moisture in the material to 0.08% by vacuuming , and then lower the temperature to 45°C;
[0045] Step 2. Slowly add 680g of HDI into the reactor, raise the temperature to 85°C, and cool down to 45°C after reacting for 6 hours;
[0046] Step 3. Add 6g of ethylenediamine and 500ml of acetone, raise the temperature to 58°C, and keep the acetone boiling. After reacting for 4 hours, remove the acetone in the system by distillation under reduced pressure. While distilling, stir vigorously and add 2980g of water dropwise to complete the emulsification process. An appropriate amount of ammonia water was used to adjust the pH of the system to 8, and an aqueous polyurethane dispersion with a solid content of about 47% was obtained.
[0047] Step 4. Add 2g Tego Foamex-825 and 4g Vesmody in turn to the water-based polyurethane dispers...
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