Polyurethane microcapsule and preparation method thereof
A technology of polyurethane microcapsules and polymers, which is applied in the preparation of microcapsule preparations and microspheres, etc., can solve the problems of inability to get rid of dependence, and achieve the effect of easy realization of synthesis process, easy regulation, and improved thermal stability
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Embodiment 1
[0063] Prepare a polyurethane microcapsule.
[0064] 1. Preparation of oxazolidine compounds: 16 parts of 2-isopropyl-3-hydroxyethyl-1,3-oxazolidine and 11 parts of isophorone diisocyanate were mixed in molar ratio; Then the mixture was placed in a dry Erlenmeyer flask, added with a rotor, sealed at the mouth of the bottle, and stirred on a magnetic stirrer at room temperature for 6 hours to obtain oxazolidine compounds, which were stored in a drying tower.
[0065] 2. Preparation of polyurethane microcapsules: counting by weight, take 45 parts of gum arabic and mix them into distilled water, stir fully at room temperature, stirring speed is 500rpm, stirring time is 2-4 hours, then add 1 part of photoinitiated Agent 2959 was stirred; then 25 parts of trimethylolpropane tris (3-mercaptopropionate) (TMMP), 15 parts of trithiophene (TTT), 13 parts of isophorone diisocyanate and the oxane prepared in step 1 The oxazolidine compound is added to the above suspension, and then mecha...
Embodiment 2
[0067] Prepare a polyurethane microcapsule.
[0068] 1. Preparation of oxazolidine compounds: counting by molar ratio, take 16 parts of 2-isopropyl-3-hydroxyethyl-1,3-oxazolidine and 13 parts of diphenylmethane-4,4' -Diisocyanates are mixed; then the mixture is placed in a dry Erlenmeyer flask, added to the rotor, sealed at the bottle mouth, placed on a magnetic stirrer at room temperature and stirred for 8 hours to obtain oxazolidine compounds, stored in dry tower.
[0069] 2. Prepare polyurethane microcapsules: count in parts by weight, get 50 parts of polyglycidyl methacrylate (PGMA) and stir and mix it into distilled water, stir fully at room temperature, the stirring speed is 500rpm, and the stirring time is 2-4 Hour, then add 1 part of photoinitiator 819 and stir; Then 25 parts of trimethylolpropane three (3-mercaptopropionate) (TMMP), 15 parts of trithiophene (TTT), 21 parts of diphenylmethane- Add 4,4′-diisocyanate and the oxazolidine compound prepared in step 1 to t...
experiment example
[0074] The physical and chemical properties of the oxazolidine compounds and polyurethane microcapsules in Example 1 were detected.
[0075] 1. Characterize the structure of the polyurethane microcapsules prepared in Example 1 by infrared spectroscopy, as figure 1 shown. As can be seen from the figure, at 2264cm -1 The asymmetric stretching vibration peak of -N═C═O appears at 1705cm -1 The stretching vibration absorption peak of -C═O in carbamate appears at 3336cm -1 It is the N-H stretching vibration peak in the carbamate, and the infrared spectrum of the shell part does not appear to have a distinctive 2264cm -1 The asymmetric stretching vibration peak of -N═C═O at the position shows that the core layer of the microcapsules contains isocyanate. The infrared analysis showed that the designed polyurethane microcapsules were indeed synthesized.
[0076] 2. Characterize the structure of the oxazolidine compounds prepared in Example 1 by infrared spectroscopy, as figure 2 ...
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