Isocyanate microcapsule and preparation method thereof
A technology of isocyanate and diisocyanate, applied in the field of isocyanate microcapsules and its preparation, can solve problems such as instability and application impact
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[0043] The present invention also provides a method for preparing isocyanate microcapsules described in the above technical scheme, comprising the steps of:
[0044] Mixing and emulsifying isocyanate or isocyanate mixed solution with gum arabic aqueous solution to obtain isocyanate-gum arabic mixed solution; the isocyanate mixed solution is a mixture of one or both of stabilizer and diluent and isocyanate;
[0045] Agglomerating the isocyanate-gum arabic mixture with an aqueous gelatin solution, an acid regulator and the remainder of water to obtain an agglomerate;
[0046] curing the aggregate to obtain isocyanate microcapsules;
[0047] The mass concentrations of the gelatin aqueous solution and the gum arabic aqueous solution are independently 5-20%.
[0048] The invention mixes and emulsifies isocyanate or isocyanate mixed solution with gum arabic aqueous solution to obtain isocyanate-gum arabic mixed solution; the isocyanate mixed solution is a mixture of one or two of s...
Embodiment 1
[0057] The isocyanate microcapsules provided by the invention are obtained from raw materials comprising the following parts by mass:
[0058] Water: 70 parts; Gelatin: 4.2 parts; Gum Arabic: 4.0 parts; Polymethylene polyphenyl polyisocyanate: 16 parts; Octadecane: 0.8 parts; Toluene: 7.8 parts; Hydrochloric acid solution: 2.4 parts;
[0059] The specific preparation method is as follows:
[0060] Weigh gelatin and gum arabic, and prepare them into gelatin aqueous solution and gum arabic aqueous solution with a mass concentration of 10% and 15% respectively; add octadecane and toluene to polymethylene polyphenyl polyisocyanate to prepare a mixed solution ; The above mixed solution is added to the pre-prepared gum arabic aqueous solution and mechanically stirred, the stirring speed is 1000rpm, after stirring for 30min, polymethylene polyphenyl polyisocyanate-gum arabic mixed solution is obtained; the obtained polymethylene Under the condition of 50°C, add the pre-prepared aque...
Embodiment 2
[0068] The isocyanate microcapsules provided by the invention are obtained from raw materials comprising the following parts by mass:
[0069] Water: 90 parts; Gelatin: 1.33 parts; Gum Arabic: 1.33 parts; Hexamethylene isocyanate: 5.3 parts; Simethicone: 0.1 parts; Sulfuric acid solution: 1.94 parts;
[0070] The specific preparation method is as follows:
[0071]Weigh gelatin and gum arabic, and prepare them into gelatin aqueous solution and gum arabic aqueous solution with a mass concentration of 8% and 12% respectively; add dimethyl silicone oil to hexamethylene isocyanate to prepare a mixed solution; add the mixed solution to In the pre-prepared gum arabic aqueous solution and mechanically stirred, the stirring speed was 800rpm, and the time was 40min to obtain a hexamethylene isocyanate-gum arabic mixed solution; the obtained hexamethylene isocyanate-gum arabic mixed solution was placed in Under the condition of 40°C, add the pre-prepared gelatin aqueous solution into th...
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