Hollow polymer particle and manufacturing method thereof
A manufacturing method and polymer technology, which can be used in the preparation of microspheres, microcapsule preparations, temperature recording methods, etc., can solve the problems of low hollow particles and other problems, reduce the generation of concave particles, improve the thermal insulation effect, and make a leap in recording sensitivity Sex-enhancing effect
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[0075] [Example 1]
[0076] In a 1000 ml four-neck flask containing 201.2 g of deionized water, 0.6 g of adipic acid and diethanolamine condensate was dissolved as a dispersing aid, and 8.5 g of colloidal silica was added as a dispersant. The pH of this aqueous solution was adjusted to 3.0 with 4.5 g of a 3% dilute sulfuric acid aqueous solution, and it was used as an aqueous phase.
[0077] 11.2 g of methyl methacrylate and 1.3 g of acrylonitrile were used as polymerizable monomers, 12.5 g of trimethacrylic acid trimethylolpropane as a crosslinking agent, and 150.0 g of n-heptane as an organic solvent were mixed to form an oil phase.
[0078] The water phase and the oil phase are mixed, and stirred with a TK automatic homogenizer M type (manufactured by Special Chemical Industry Co., Ltd.) at a rotation speed of 12000 rpm for 6 minutes. After adjusting the particle size to 1-10 μm, add 2,2'-azo As a polymerization initiator, 0.1 g of bisisobutyronitrile was replaced with nitrogen, ...
Example Embodiment
[0085] [Example 2]
[0086] As a diluent containing n-heptane inside and a fine particle dispersion after polymerization, 385.0 g of warm water (85°C) above 79°C, which is the azeotropic point of n-heptane and water, was added. By the same operation, polymer particles with high hollow rate in a wet state are produced.
[0087] Maintaining the temperature of the dispersion from the start of the polymerization reaction to the vaporization and removal of the organic solvent from the uncooled state, the same operation as in Example 1 was performed to vaporize and remove the n-heptane contained in the microparticles to obtain Produce hollow particles in a wet state.
[0088] The enlarged image obtained by photographing the obtained polymer particles with an electron microscope is shown in image 3 . By this image 3 It can be confirmed that the obtained polymer particles are different from the hollow polymer particles manufactured based on the existing method ( figure 1 ), or compared ...
Example Embodiment
[0092] [Example 3]
[0093] The deionized water used in the preparation of the aqueous phase was 586.2 g, and the diluent was not used after the emulsification dispersion and suspension polymerization, except that the same operation as in Example 2 was carried out to carry out the n-heptane contained in the particles. The gasification and removal, so as to obtain hollow particles in a wet state.
[0094] It was confirmed that the recessed concave particles in the polymer particles decreased, and the hollow polymer particles with a high hollow rate further increased, and this degree was approximately the same as in Example 2.
[0095] The visual shape of the particles obtained in Example 3 is shown in Table 1, and the recording sensitivity of the thermosensitive recording medium using the particles as a heat insulating material is shown in Table 2.
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