| Pearl fiber is an excellent anti-ultraviolet functional fibers filled with nano-meter pearl power by blend spinning.But the pearl powder distributed in the fibers will be easily acidolysis when go through the coagulation bath which composed of sulfuric acid and its salts solution.So a kind of acid resistant pearl powder is esssntial to meet the requirements of pearl fiber preparation.In this thesis,firstly,a series amphiphilic polymer dispersant SMH hydrolyzed from SMA which was synthesized from styrene(St) and maleic anhydride(MAn) by homogeneous solution polymerization.Influencing factors of SMA intrinsic viscosity and the content of MAn in the copolymer including the molar ratio of St to MAn,dosage of initiator and polymerization temperature were researched.The results showed that the content of MAn in the copolymer increased with the MAn monomer increased,but the increasing trends slowly.And the content of MAn in copolymer is less than 50%.The intrinsic viscosity of SMA significantly reduced with the polymerization temperature and initiator concntration increased.The main component of pearl powder is CaCO3,so use ultra-fine CaCO3 to simulate pearl powder in this research.The ultra-fine CaCO3 was prepared with the sanding dispersant machine,the effect of the polymer dispersant SMH on the ultra-fine CaCO3 was studied,and the grinding process parameters on particle size and scattered stability was also studied.The results showed that it can obtain ultra-fine CaCO3 powders from sanding dispersant.The ultra-fine CaCO3 powders have good dispersion stability and the average diameter is about 0.2μm.The optimum conditions were determined:concentration of slurry was 60%,the dosage of dispersant SMH was 4%,which hydrolyzed from copolymer SMA in which the maleic anhydride content was 33%,the amount ofΦ2mm zirconia beads was 40mL,sanding machines rotating speed was 1500r.min-1,grinding 4 hours.In this thesis,the microencapsulation of self-made ultra-fine CaCO3 was prepared from St and acrylate acid(AA) by polymerization method.The effct on acid-resistant and average size of the ultra-fine CaCO3 was researched,including the monomer adding methods,concentration of monomer,qualities ratio of monomers to ultra-fine CaCO3 powders,initiator concentration,reaction temperature and reaction time.It was found that the better monomer adding method was adding initiator to the CaCO3 slurry before dropping monomer.Under the following conditions:total mass of monomer to the quality of CaCO3 was 0.7,m(AA)/m(St) was 0.5,the relative quality percent of APS to CaCO3 was 0.6%,the polymerization temperature was 90℃and polymerization reaction time was 12h,the acid-resistant of ultra-fine CaCO3 was up to 65%at pH=2,and its average size was about 1μm.
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