Synthesis And Application Of Dispersants Based On Modified Styrene-maleic Copolymer

The thesis is divided into two parts. For first part, the hyperbranched styrene-maleic anhydride polymers(BPSMA) had been successful formed through radical polymerization by using St and MA as common monomers and 4-vinyl benzyl thiol as chain transfer monomer. Through modification, the hyperbranched styrene-maleic anhydride polymers were reaction with alcohol to produce esterified esters of hyperbranched styrene-maleic anhydride copolymer(BPSME). Modification conditions were investigated in detail, such as reaction temperature, time, types and dosages of alcohol. Finally, various polymers, SMA, BPSMA and BPSME, had been used in dispersing red P. R122. BPSME was characterized by FTIR spectra, and its esterification degree has close related with reaction temperature, reaction time and esterifying agent, such as structure of alcohol and its dosage. The dispersing ability of SMA, BPSMA and BPSME to red P.R122 was as follows: BPSME > BPSMA > SMA. Interesting, BPSME showed high dispersity to red P.R122, that diameter was controlled about 152 nm and stabilities(centrifugal and heat /freeze resistance) were over 97 %.For the second part, a novel kind of reactive dispersant(SMD) was synthesized by modifying poly(styrene-maleic anhydride) with 4-(ethylsulfurate sulfonyl) aniline(D) through acylation reaction. The influence of modification conditions, such as time, temperature, dosages of catalyst and modifier D on grafting yield were investigated. Then, SMD were used to disperse carbon black(CB), the influence of sonication time, pH, contents of carbon black and structure of SMD on the dispersibility of pigment dispersion were detail studied. Besides, The CB dispersion was futher applicated on dyeing fabrics. Dyeing performance of dyed cotton fabrics with CB dispersion was explored and estimated by measuring color yield and fastness of dyed fabrics. The SMD was successfully characterized via infrared, 1H-NMR and UV-Vis spectroscopy. Compared to SMA, SMD had lower glass transition temperature(Tg) and higher critical water content(CWC). Meanwhile, its solubility and thermal stability also showed great changes. Regarding to acylation reaction, the grafting yield of SMD was closely related to mentioned modification conditions. The grafting yield of SMD was 39.72 % when mole ratio of anhydride to ethylsulfoaniline was 1.5:1, the mass fraction of p-toluenesulfonic acid to SMA was 5%, reaction temperature and time were 65? and 6h. The optimal preparation conditions for the CB dispersion were that the mass ratio of SMD(mole ratio of D to SMA 4:3) and CB was 3%, sonication time 20min at pH=8. The CB dispersion prepared under optimal conditions showed excellent stability and small particle size. The dyed cotton fabric with SMD dispersed nanoscale CB dispersion had higher K/S value, rubbing and washing fastness than of SMA, which indicated SMD absorbed CB surface could react with –OH groups to fix the CB onto cotton fabrics. The K/S value of the dyed cotton fabric with SMD dispersed nanoscale CB dispersion was 9.52, its dry and wet rubbing fastness, color fastness were respectively of grade 4, 2~3 and 4~5 when the mass ratio of SMD to CB was 10 %, concentration of CB was 10 g/L, dosage of binder was 10 g/L and dosage of alkali was 40 g/L, with steaming 10 min at 115?.