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에어로졸 반응기를 이용한 기상에서의 Polyurea 미립자의 제조
Preparation of Polyurea Fine Particles Using Aerosol Reactor
HWAHAK KONGHAK, December 1993, 31(6), 723-734(12), NONE
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Abstract
구형의 단분산 polyurea 고분자 입자를 에어로졸상에서 중합하여 만들었다. 단량체인 toluene diisocyanate, 또는 hexamethylene diisocyanate를 증발-응축시켜 미세한 액방울을 만든 다음 이를 ethylene diamine 증기와 반응시켰다. NaCl입자로 된 seed를 사용하여 불균일 핵생성을 시키면 입자의 크기가 더욱 고르게 되고 입자의 크기를 줄일 수 있었다. 제조된 입자의 크기는 단량체의 증발관 온도에 따라 커지고 운반기체의 유량이 감소하면 약간 커졌다. 재증발관을 사용하면 입자의 크기가 더욱 단분산되었으며 입자의 형태는 입자크기가 작을수록, 입자내 확산속도에 비해 반응속도가 늦을수록 안이 차고 표면이 매끄러워졌다. 중합때와 같은 방법으로 titanium tetraethoxide 액방울을 이용하여 이 입자를 적시고 이를 수증기와 반응시킴으로써 표면을 TiO2로 코팅하여 복합입자의 제조를 시도하였다. 또 이 방법을 polyamide입자의 제조에까지 응용하여 그 범용성을 보이었다.
Spherical polymer particles with narrow size distribution have been prepared by aerosol-phase polymerization. The polyurea particles were prepared by the reaction of TDI(toluene-2,4-diisocyanate) or HDI(hexamethylene diisocyanate) droplets with EDA(ethylene diamine) vapor. The use of seed(NaCl) nuclei helped the polymer particles smaller in size and made the size distribution of the particles narrower. The particle size increased substantially with boiler temperature and decreased slightly with increasing the carrier gas flow rate. Increase in reboiler temperature improved the monodispersity of the particle size. Sphericity and surface smoothness of the particles were improved by decreasing particle size and controlling the reaction rates. The coating of TiO2 on the surface of the prepared polymer particles was carried out by condensing Ti(Oet)4 on the particle surface and subsequently reacting the liquid film with water vapor. The reaction system was also applied to prepare polyamide particles successfully.
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