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US 9,000,098 B2Granted
Method of fabricating highly cross-linked polymer spheres having uniform granular sizes
AssigneeChung-Shan Institute of Science and Technology, Armaments, Bureau, Ministry of National Defense
InventorsMing-Hsiung Wei, Yu-Wei Hou, Hui Chen, Chun-Lan Tseng
Life of this patent
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Abstract
Polymer spheres are fabricated. Dispersing polymerization and a two-stage swelling procedure are processed. The polymer spheres fabricated have uniform granular sizes and are highly cross-linking. Thus, the polymer spheres are heat-resistant and solvent-resistant.
Claims17
A method of fabricating cross-linked polymer spheres having uniform granular sizes, comprising the steps of:
- (a) obtaining a plurality of seeds through dispersion polymerization;
- (b) mixing a content of a swelling assistant and a content of a surfactant to be added with said plurality of seeds to obtain a seed solution, wherein said swelling assistant, said surfactant and said plurality of seeds are mixed through ultra-sonic vibration with magnetite for 30˜40 minutes (min) and, then, are stirred with a mechanical stirrer at a speed of 120˜160 rounds per minute (rpm) under a temperature of 25˜35 Celsius degrees (° C.) for a time period of 8˜12 hours (hr);
- (c) uniformly mixing a content of a monomer and a content of an initiator to be added with a content of a cross-linking agent and a content of a surfactant to obtain a monomer emulsion after homogenization;
- and
- (d) mixing said seed solution and said monomer emulsion to be stirred and added with a stabilizer and an inhibitor after processing monomer swelling;
- then, flowing in nitrogen and stirring to uniformly process mixing;
- and, then, heating up to process polymerization to obtain a plurality of cross-linked polymer spheres, wherein said spheres have an average granular diameter twice as big as that of said seeds.
4 more elements
A method of fabricating cross-linked polymer spheres having uniform granular sizes, comprising the steps of:
- (a) obtaining a plurality of seeds through dispersion polymerization;
- (b) mixing a content of a swelling assistant and a content of a surfactant to be added with said plurality of seeds to obtain a seed solution;
- (c) uniformly mixing a content of a monomer and a content of an initiator to be added with a content of a cross-linking agent and a content of a surfactant to obtain a monomer emulsion after homogenization, wherein said monomer, said initiator, said cross-linking agent and said surfactant are homogenized at a speed of about 8000 to about 12,000 rpm for 10˜20 min and, then, are uniformly dispersed with a ultra-sonic shaker for 10˜20 min to obtain said monomer emulsion;
- (d) mixing said seed solution and said monomer emulsion to be stirred and added with a stabilizer and an inhibitor after processing monomer swelling;
- then, flowing in nitrogen and stirring to uniformly process mixing;
- and, then, heating up to process polymerization to obtain a plurality of cross-linking polymer spheres, wherein said spheres have an average granular diameter twice as big as that of said seeds.
3 more elements
Dependencies are inferred from the claim text.