Preparation And Performance Of A Novel Salt-Tolerant Thickenner

In this paper, the novel salt-tolerant thickeners were prepared via inverseemulsion polymerization of acrylic acid and sodium acrylate, the long-chain reactivemonomer LP as a comonomer to improve the performance of polymer，s salt-tolerant.The ideal formula and process conditions were obtained through experiments. Themain performances of polymer were analysed and the studying content andconclusions were as follows:The first novel salt-tolerant thickener were prepared via inverse emulsionpolymerization of sodium acrylate and long-chain reactive monomer LP using sorbitanmonostearate （Span-60） and nonylphenol ethoxylates （TX-10）（HLB value of about7.66） as emulsifier, N,N-methylene bisacrylamide （MBAM） as crosslinker andpotassium persulphate （KPS） and sodium bisulfite （NaHSO₃） as initiators. Theresearches showed that the introduction of a certain amount of the long-chain reactivemonomer LP can improve the salt-tolerant of thickener, but it can not satisfy thepractical applications because of the poor thickening.Because of the poor salt-tolerant of sodium polyacrylate thickener, so wedeveloped another thickener of polyacrylic acid with better salt-tolerant property.In common, The second novel salt-tolerant thickener with better salt-tolerant andideal performance were prepared via inverse emulsion polymerization of acrylic acidand long-chain reactive monomer LP using sorbitan monostearate （Span-60） asemulsifier, N,N-methylene bisacrylamide （MBAM） as crosslinker and potassiumpersulphate （KPS） and sodium bisulfite （NaHSO₃） as initiators. The morphologies,polymer srructure and thermal performance were characterized. The influences of the amount of the emulsifier, the long-chain reative monomer LP, the crosslinkers and theinitiators on the salt-tolerant properties and the viscosity of thickening were studieddetailedly. As a result, the studies had shown that when the amount of the emulsifier,the long-chain reactive monomer LP, the initiator and crosslinker were accounted forthe total monomer of12%,6.7%,4‰and2‰, the product had the best thickeningeffect and salt-tolerance.