Hollow particles, method for producing same, and usage of same
A manufacturing method and hollow technology, which is applied in the preparation of microspheres, microcapsule preparations, instruments, etc., can solve the problems of reduced mechanical strength and surface scratch resistance of formed objects, and achieve the effect of preventing the hollow part from being crushed
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Embodiment 1
[0265](1) Add 1440 parts by mass of ion-exchanged water, 2.4 parts by mass of sodium p-styrenesulfonate, and 0.8 parts by mass of potassium persulfate to a 2L reactor equipped with a stirrer and a thermometer, raise the temperature to 70°C, and replace the internal system with nitrogen. into a nitrogen atmosphere. Mix 70.4 parts by mass of glycidyl methacrylate, 9.6 parts by mass of 3-methacryloxypropyl triethoxysilane, 1.6 parts by mass of n-octyl mercaptan, and 80 parts by mass of toluene, and use internal ultrasonic The mixed solution was irradiated with ultrasonic waves for 10 minutes by an emulsifier (manufactured by Branson Corporation, model number: SONIFIER 450) to perform forced emulsification. Emulsion polymerization was performed for 2 hours while stirring in a reactor heated to 70°C. At this stage, a large number of epoxy groups remain in the particles.
[0266] Next, in order to superpose|polymerize the epoxy group which remained, 40 mass parts of ethylenediamin...
Embodiment 2
[0270] A hollow particle isopropanol dispersion was obtained in the same manner as in Example 1, except that the polymerization temperature after adding ethylenediamine was 70° C. and the polymerization time was 40 hours. The amount of epoxy groups remaining after the phase separation step was 0.45 mmol / g. Observation with a transmission electron microscope revealed spherical particles with cavities inside. The dispersed particle size of the above-mentioned hollow particles in isopropanol was 103 nm, and the hollow rate was 42% by volume. In addition, the residual amount of unreacted epoxy groups in the hollow particles in isopropanol was 0.006. In addition, the total light transmittance of the cured product containing hollow particles is as high as 95.0%. In addition, the appearance of the hollow particle-containing cured product after the alkali resistance test was the same as that of the surrounding area, and it was a cured product excellent in alkali resistance.
Embodiment 3
[0272] Except changing ethylenediamine into diethylenetriamine, it carried out similarly to Example 2, and obtained the hollow particle isopropanol dispersion liquid. The amount of epoxy groups remaining after the phase separation step was 0.62 mmol / g. Observation with a transmission electron microscope revealed spherical particles with cavities inside. The dispersed particle size of the above-mentioned hollow particles in isopropanol was 106 nm, and the hollow rate was 44% by volume. In addition, the residual amount of unreacted epoxy groups in the hollow particles in isopropanol was 0.009. In addition, the total light transmittance of the cured product containing hollow particles is as high as 95.1%. In addition, the appearance of the hollow particle-containing cured product after the alkali resistance test was the same as that of the surrounding area, and it was a cured product excellent in alkali resistance.
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