Preparation method of solvent-free polyurethane adhesive
A polyurethane adhesive, solvent-free technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as long open time, adhesive penetration, inability to achieve large-scale industrial production, and achieve good mechanical properties. The effect of strength, good mechanical properties
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[0030] The preparation method of solvent-free polyurethane adhesive comprises the steps:
[0031] Step 1, the preparation of polyurethane emulsion:
[0032] In a three-neck flask equipped with a thermometer and a stirring rod, first put the self-made polyester diol in N2 Under protection, dehydrate under vacuum at 115°C for 100min, then cool to 70°C, adjust the rotating speed to 200r / min, slowly add isophorone diisocyanate and dibutyltin dilaurate (catalyst, the dosage is 0.01% of the mass of the reactant), and React at 90°C for 2.5h, use the di-n-butylamine method to measure the mass fraction of -NCO groups, when it reaches the theoretical value (9.59%-9.69%), cool to 78°C, add metered dimethylolbutyric acid and Dibutyltin dilaurate (the amount used is 0.01% of the mass of the reactant), adjust the rotating speed to 250r / min, and react at 80°C for 2.5h; then use the di-n-butylamine method to measure the mass fraction of the -NCO group, when it reaches the theoretical value A...
Embodiment 1
[0050] The preparation method of solvent-free polyurethane adhesive comprises the steps:
[0051] Step 1, the preparation of polyurethane emulsion:
[0052] In a three-neck flask equipped with a thermometer and a stirring rod, first put the self-made polyester diol in N 2 Under protection, dehydrate under vacuum at 115°C for 100min, then cool to 70°C, adjust the rotating speed to 200r / min, slowly add isophorone diisocyanate and dibutyltin dilaurate (catalyst, the dosage is 0.01% of the mass of the reactant), and React at 90°C for 2.5h, use the di-n-butylamine method to measure the mass fraction of -NCO groups, when it reaches the theoretical value (9.59%-9.69%), cool to 78°C, add metered dimethylolbutyric acid and Dibutyltin dilaurate (the amount used is 0.01% of the mass of the reactant), adjust the rotating speed to 250r / min, and react at 80°C for 2.5h; then use the di-n-butylamine method to measure the mass fraction of the -NCO group, when it reaches the theoretical value ...
Embodiment 2
[0063] The preparation method of solvent-free polyurethane adhesive comprises the steps:
[0064] Step 1, the preparation of polyurethane emulsion:
[0065] In a three-neck flask equipped with a thermometer and a stirring rod, first put the self-made polyester diol in N 2 Under protection, dehydrate under vacuum at 115°C for 100min, then cool to 70°C, adjust the rotating speed to 200r / min, slowly add isophorone diisocyanate and dibutyltin dilaurate (catalyst, the dosage is 0.01% of the mass of the reactant), and React at 90°C for 2.5h, use the di-n-butylamine method to measure the mass fraction of -NCO groups, when it reaches the theoretical value (9.59%-9.69%), cool to 78°C, add metered dimethylolbutyric acid and Dibutyltin dilaurate (the amount used is 0.01% of the mass of the reactant), adjust the rotating speed to 250r / min, and react at 80°C for 2.5h; then use the di-n-butylamine method to measure the mass fraction of the -NCO group, when it reaches the theoretical value ...
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