Isocyanate derivative microcapsule and preparation method thereof
A technology of isocyanate and hexamethylene diisocyanate, which is applied in the field of isocyanate derivative microcapsules and its preparation, can solve the problems of undisclosed paint film and achieve the effect of prolonging the service life
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[0037] The invention provides a preparation method of isocyanate derivative microcapsules. Include the following steps:
[0038] a) mixing the auxiliary agent with the molten modified paraffin to obtain a mixture of paraffin wax and auxiliary agent;
[0039]b) adding isocyanate derivatives dropwise to the mixture of paraffin wax and additives obtained in step a), and stirring at a rate of 200r / min-1200r / min to obtain a microcapsule precursor;
[0040] c) Making the microcapsule precursor obtained in the step b) into granules to obtain isocyanate derivative microcapsules.
[0041] In the present invention, firstly, the auxiliary agent is mixed with the melted modified paraffin to obtain the mixture of paraffin wax and auxiliary agent. In the present invention, it is preferred to heat the modified paraffin above its melting point to melt the modified paraffin; then add additives to the melted modified paraffin and stir to make it evenly mixed. The present invention has no spe...
Embodiment 1
[0063] Take 3.5g of modified paraffin wax produced by BASF (BASF) in Germany and put it into a container, raise the temperature to 130°C, add 0.18g of gelatin to it, and stir for 10 minutes to make it evenly dispersed into the modified paraffin wax solution Get the HDI trimer of 6.32g again, dropwise join in the modified paraffin wax solution in 5 minutes, stir 30 minutes with the rotating speed of 300r / min, obtain the microcapsule precursor; The precursor is ejected, and the spraying pressure is 0.4 MPa to obtain the modified isocyanate derivative microcapsules.
[0064] The present invention detects that the average particle diameter of the isocyanate derivative microcapsules prepared in this example is 35 microns.
[0065] In the present invention, 10.0000 g of the isocyanate derivative microcapsules prepared in this example were stored at room temperature for 6 months without agglomeration, with a weight gain of 0.0427 g and a weight gain rate of 4.27‰, which shows that th...
Embodiment 2
[0068] Take 6.0g of modified paraffin wax produced by German BASF (BASF) company and put it into a container, raise the temperature to 70°C, add 0.12g of emulsifier to it, and stir for 10 minutes to make it evenly dispersed into the modified paraffin wax solution 3.88 g of HDI-TMP adduct was added dropwise to the paraffin solution within 5 minutes, and stirred at a speed of 1200 r / min for 30 minutes to obtain a microcapsule precursor;
[0069] The microcapsule precursor is sprayed out by an air spraying method, and the spraying pressure is 0.3 MPa to obtain the isocyanate derivative microcapsules.
[0070] The present invention detects that the average particle diameter of the isocyanate derivative microcapsules prepared in this example is 16 microns.
[0071] In the present invention, 10.0000 g of the isocyanate derivative microcapsules prepared in this example were stored at room temperature for 6 months without agglomeration, with a weight gain of 0.0639 g and a weight gain...
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