Preparation method of environmentally-friendly aqueous polyurethane adhesive
A water-based polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of inconvenience for large-scale production, increase production costs, and difficulty in operation, and achieve energy saving, The initial viscosity is strong, and the effect of not easy to agglomerate and precipitate
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[0022] The raw material composition of this environmentally-friendly waterborne polyurethane adhesive preparation method is calculated by mass percentage:
[0023] 10-50% of polymerized diols with a number average molecular weight of 500-5000,
[0024] A hydrophobic chain extender with a number average molecular weight of 61-400 0.1-10%,
[0025] Internal crosslinking agent 0~5%,
[0026] Hydrophilic chain extender 0.1~10%,
[0027] Diisocyanate 2~30%,
[0028] Catalyst 0.001~0.1%,
[0029] Organic solvent 0~10%,
[0030] Neutralizer 0.2~5%;
[0031] Deionized water 40~80%;
[0032] The preparation process is as follows:
[0033] (a) Add the polymerized glycol, hydrophobic chain extender, internal crosslinking agent, and hydrophilic chain extender into the reactor, under the protection of nitrogen, heat up to 110~120℃, vacuum dehydration for 15~30 minutes ;
[0034] (b) Cool to 50~60℃, add diisocyanate, the molar ratio of diisocyanate to active hydrogen compound can be controlled at (1.1~3.5)...
Example Embodiment
[0048] Example one
[0049] 1. The polyoxypropylene glycol 160g (number average molecular weight is 2000), the hydrophobic small molecule chain extender neopentyl glycol 4.16g, the internal crosslinking agent trimethylolpropane 0.54g, the hydrophilic chain extender two Add 8.58g of DMPA to a four-neck reactor equipped with a thermometer, a condenser and a stirring device. Under the protection of nitrogen, the temperature is raised to 120°C, dehydrated under vacuum for 30 minutes, cooled to 60°C, and added 45.91g isophorone diisocyanate (IPDI) (the molar ratio of diisocyanate to active hydrogen compound is 1.1:1), react at 90°C for 2 hours, then lower the temperature to 80°C, add 0.05g tetraisopropyl titanate Alcohol ester, react for 3 hours.
[0050] 2. Under the action of high-speed shearing force (stirring speed at 2000r / min), add the neutralizer triethylamine aqueous solution (triethylamine 3.88g, deionized water 520g) into the reaction kettle, neutralizer three The molar rati...
Example Embodiment
[0051] Example two
[0052] 1. Add 160g of polyoxyethylene glycol (number average molecular weight of 2000), 4.16g of neopentyl glycol, 0.54g of trimethylolpropane, and 8.58g of dimethylolpropionic acid into the reactor, under the protection of nitrogen After heating to 120°C, vacuum dehydration for 30 minutes, cooling to 60°C, adding 45.91g of isophorone diisocyanate (the molar ratio of diisocyanate to active hydrogen compound is 1.1:1), reacting at 90°C for 2 hours, and then The temperature was lowered to 80° C., 0.05 g of tetraisopropanol titanate was added and reacted for 3 hours.
[0053] 2. Under the action of high-speed shearing force (stirring speed at 2000r / min), add the aqueous solution of triethylamine (triethylamine 3.88g, deionized water 520g) into the reaction kettle and stir for 15 minutes to obtain a viscosity of A translucent waterborne polyurethane adhesive with 40CPS / 25°C, 30.10% solid content, 7.5 pH, and no organic solvents.
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