Inner crosslinking type caster oil-based waterborne polyurethane emulsion and preparation method thereof
A water-based polyurethane and castor oil-based technology, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc., can solve problems such as low cross-linking activity and unsatisfactory cross-linking efficiency, and achieve The effect of high elongation at break, reduction of high energy consumption and complicated steps, and improvement of crosslinking efficiency
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Embodiment 1
[0040] Embodiment 1, the preparation of internal crosslinking castor oil-based aqueous polyurethane emulsion
[0041]Add 12g of polytetrahydrofuran ether glycol (PTMG-2000) and 12g of castor oil (CO) into the reaction reactor (wherein, the mass ratio of PTMG-2000 and CO is 1:1), and remove water under reduced pressure and vacuum at 120°C 1.5h, when the temperature of the system drops to 70°C, add 17.6g of isophorone diisocyanate (IPDI) and 0.0192g of phosphoric acid, the R value is 1.2, and react at 80°C for 2h under the protection of dry nitrogen; : Cool down to 75°C), add 2.2g of dimethylolpropionic acid (DMPA, small molecule chain extender) and 0.0144g of dibutyltin dilaurate (DBTDL, catalyst), and continue to react at a constant temperature of 80°C for about 1.5h.
[0042] Heat up to 85°C, add 2.2g of 1,4-butanediol (BDO), react for a certain period of time, stop when the -NCO group content reaches the set value, the set value of this embodiment is 7.71% (the mass fraction...
Embodiment 2
[0045] Embodiment 2, the preparation of internal crosslinking castor oil-based aqueous polyurethane emulsion
[0046] Add 12g of polycarbonate diol (PCDL-2000) and 12g of castor oil (CO) into the reaction reactor (wherein, the mass ratio of PCDL-2000 and CO is 1:1), and vacuum remove at 120°C Water for 1.5 hours, when the temperature of the system drops to 70°C, add 17.7g of isophorone diisocyanate (IPDI) and 0.016g of phosphoric acid, the R value is 1.2, and react at 85°C for 2h under the protection of dry nitrogen. Properly lower the temperature of the system (eg, to 75°C), add 2.4g of dimethylolpropionic acid (DMPA) and 0.012g of dibutyltin dilaurate (DBTDL), and continue to react at a constant temperature of 80°C for about 1.5h.
[0047] Heat up to 85°C, add 1.9g of 1,4-butanediol (BDO) and 0.24g of trishydroxymethylaminomethane (THAM) (accounting for 0.5% of the total prepolymer mass), react for a certain period of time, add 4.0g of butane Ketone (MEK) adjusts the viscos...
Embodiment 3
[0050] Embodiment 3, the preparation of internal crosslinking castor oil-based aqueous polyurethane emulsion
[0051] Add 12g of polycarbonate diol (PCDL-2000) and 12g of castor oil (CO) into the reaction reactor (wherein, the mass ratio of PCDL-2000 and CO is 1:1), and vacuum remove at 120°C Water for 1.5 hours, when the temperature of the system drops to 70°C, add 17.7g of isophorone diisocyanate (IPDI) and 0.0192g of phosphoric acid, the R value is 1.2, and react at 80°C for 2h under the protection of dry nitrogen. Properly lower the temperature of the system (eg, to 75°C), add 2.4g of dimethylolpropionic acid (DMPA) and 0.0144g of dibutyltin dilaurate (DBTDL), and continue to react at a constant temperature of 80°C for about 1.5h.
[0052] Raise the temperature to 85°C, add 1.7g of 1,4-butanediol (BDO) and 0.36g of trishydroxymethylaminomethane (THAM) (accounting for 0.75% of the total prepolymer mass), react for a certain period of time, and add 3.5g of butyl Ketone (MEK...
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