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Preparation Of Color Nano - Latex Particles And Study On Their Agglomeration And Composite Technology

Posted on:2016-12-19Degree:MasterType:Thesis
Country:ChinaCandidate:J LiFull Text:PDF
GTID:2271330461978088Subject:Materials science
Abstract/Summary:PDF Full Text Request
As office supplies, Color toner’s dosage increased year by year. The preparation of color toner with chemical method, such as emulsion polymerization, suspension polymerization, had attracted more and more attention for its colorful and high resolution. Nano scale composite color latex particles with Multicomponent and one-component were prepared by emulsion polymerization method, and two kinds of condensation technology (inorganic salt coagulation and condensation of unlike charges) were studied in this paper. The nano scale color latex particle with controllable growth in size and narrow particle size distribution and morphology of smooth toner particles were finally achieved. The particle size, morphology and thermodynamic properties of composite latex particles were characterized by transmission electron microscopy(TEM), Zeta sizer, laser particle size instrument, thermal analysis(TG and DSC). The morphology, particle size and its distribution, coagulation kinetics of aggregated particles were characterized by scanning electron microscopy(SEM)and optical microscope, laser particle size instrument. The effect of emulsifier dosage on the diameter and morphology of latex particles, effect of stir speed, temperature, time, the ratio of SDS to TX-100 and curing on the diameter and structure of aggregated particles, the results are as following:For color latex particles:nano scale color latex particles with pigment as core were prepared by the ratio of SDS to TX-100 was 1:4, the latex particles size decreased from 160nm to 34nm and the clear core/shell structure gradually disappeared with the emulsifier dosage which based on the monomer increased from 1% to 25%, and the stability of emulsion increased with increasing the PH; For the Multicomponent color latex particles, color latex particles with pigments, PE wax and charge regulator as core were successfully prepared by SDS and TX-100 as emulsifier, emulsification process had big effect on the stability of emulsion, the latex particles increased at first and decreased then with emulsifier increased from 4% to 20%, and reached a peak value at about 16%.For the inorganic salt coagulation technology:one-component latex particles prepared by 8% of emulsifier were select for the coagulation. There were three main stage during the coagulation:the flocculation, the consolidation stage and curing stage. In the flocculation stage,floc size decreases with increasing the V and increased with C increased, when V increased to 1000 r/min, the effects of V on the size of floc decreased; In the consolidation stage,T has a great influence on strength of aggregated particles, glass transition temperature (Tg) was as the boundary, floc size increases with the rising the T when above Tg, there was no significant change when below the Tg, and the influence of C on the floc size can be ignored; Proper curing temperature and time can be structured particle morphology,reduce the number of small particles.Heterocoagulation Method:SDS and TX-100 were selected as the emulsifier for the anionic emulsion, TX-100 and CTAB were for the cationic emulsion, the opposite charge emulsions mixed to study the coagulation process. The investigation focus on the effect of mass ratio between ionic and non-ionic emulsifier on the size and stability of emulsion, the floc strength and flocculating rate during the heterocoagulation process, the effect of temperature, stirring and curing on the size and morphology of aggregated particles. Results showed that:the stability of emulsion increased and the latex particles size decreased with increasing the mass ratio of nonionic emulsifier. During the floccolation process, the floc strength increased, the floc rate decreased and the floc size increased with increasing the mass ratio of inonic emulsifier. The emulsion prepared by emulsifier mass ratio of SDS to TX-100 is 1:4 and CTAB to TX-100 is 2 were select as the mixed emulsion for the coagulation, with mixed rate of 1000r/min, consolidation temperature of 65℃ and curing temperature of 75℃, aggregated particles with suitable size and good morphology would be obtained.
Keywords/Search Tags:inorganic salt coagulation, stirring speed, heterogeneous condensation, color latex panicles
PDF Full Text Request
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