Synthesis And Pigment Dispersion Properties Of Styrene-maleic Hydride Resin And Modifiers

As a kind of important resin, Styrene-maleic anhydride copolymer (SMA) has been been deeplyconcerned by scientific workers in recent years. At present,the domestic production of SMA productsexsist some unresolved issues, such as deep color, heavy odor, and poor solubility. Therefore, thispaper focuses on basic development and research of SMA resin to explore their new products.Firstly, the basic research of SMA resin was developed,for which, styrene (St), maleicanhydride (MA) used as monomer, azobisisobutyronitrile (AIBN) as initiator,"chlorinatedhydrocarbons R with special structure" as the chain transfer agent and ethyl acetate as the solvent,and a free radical solution polymerization method was used (product number: SMA1000). Throughsingle factor and orthogonal experiment, influence of temperature and amount of initiator, chaintransfer agents, solvents on the SMA resin relative molecular weight (Mw) and distribution (MWD)were studyed, thus, the primary and secondary effects of each factor was arrived, and the optimalprocess is: initiator and chain transfer agent respectively accounted for2%and1%of the totalquality of monomer, the solvent is twice the amout of monomer, and the reaction temperature is70℃. Under this condition, the product smell, glass transition temperature, alkali soluble index andother indicators were consistent with those of the American sand sodom SMA1000.Secondly, this paper focus on the development of new products for the SMA. Taken styrene (St),maleic anhydride (MA), acrylic acid (AA) as monomer terpolymer, and then partially esterified toprepare St-MA-AA esterification, which determined by infrared analysis. Followed by single factorand orthogonal experiment, the influence of dosage of initiator, chain transfer agent, solvent andreaction temperature on molecular weight and distribution of St-MA-AA partial esterification resinwere studyed, and the optimal process is: initiator and chain transfer agent respectively accountedfor1%and1%of the total quality of monomer, the solvent is three times the amout of monomer, andthe reaction temperature is70℃. Under this condition, the product smell, glass transition, alkalisoluble index and other indicators were consistent with those of the American sand sodomSMA1440.Finally, the self-made partially esterified St-MA-AA was applied to the phthalocyanine bluepigment dispersion test as a polymer dispersant.(1) Influence of the different molecular weight anddistribution of resin on the surface treatment of pigment pigment average particle size, Zeta potential,Centrifugal stability, and relative tinting strength. The results show: the s best dispersant of elf-madeSt-MA-AA partial esterification in relative molecular mass (Mw) is7224, the molecular weightdistribution is1.46(2)The research of self-made St-MA-AA partial esterification of as polymericdispersant dosage on the average particle size of dispersion, viscosity, centrifugal stability, at thesame time Yishaduoma SMA1440as control experiments. Results show that the homemadeSt-MA-AA ester dispersing ability better, and obtained the optimum adding amount was10~15%.The test showed that the homemade St-MA-AA partial esterification can be used as a highperformance polymer dispersant.