聚丙烯酸类增稠剂的合成及其应用性能

以航空煤油等为连续相,丙烯酸和丙烯酰胺为共聚单体,丙烯酸异辛酯为疏水性单体用量,水为介质,Span-80为乳化剂,N,N’-亚甲基双丙烯酰胺为交联剂,过硫酸钾为引发剂,采用反向乳液聚合法合成增稠剂,在反应结束时用Tween-80进行反转相。探讨连续相种类、交联剂用量、丙烯酸用量、疏水性单体用量对增稠剂黏度及粒径的影响。优化合成工艺为:航空煤油为连续相,交联剂用量0.5%,丙烯酸、丙烯酰胺质量比3∶1,疏水性单体用量0.8%。自制增稠剂乳胶粒子形貌均匀,稳定性良好,分散均匀,没有出现过度聚合。采用自制增稠剂进行印花,成糊具有一定的耐电解质性能,印花图案清晰,得色量高,线条清晰,手感柔软,无渗边现象,符合分散染料印花对增稠剂的要求。

Synthesis and application properties of polyacrylic acid thickener

The thickener was synthesized by reverse emulsion polymerization using aviation kerosene as continuous phase,acrylic acid and acrylamide as copolymer monomer,isooctyl acrylate as hydrophobic monomer,water as medium,Span-80 as emulsifier,N,N’-methylene bisacrylamide as cross-linking agent and potassium persulfate as initiator.At the end of the reaction,Tween-80 was used to reverse the phase.The effects of the type of continuous phase,the dosage of cross-linking agent,acrylic acid and hydrophobic monomer on the viscosity and particle size of thickener were discussed.The optimized synthesis process was as follows:using aviation kerosene as continuous phase,the dosage of cross-linking agent 0.5%,the mass ratio of acrylic acid and acrylamide 3∶1,the dosage of hydrophobic monomer 0.8%.The emulsion particles of selfmade thickener had uniform morphology,good stability and uniform dispersion,and there was no over-polymerization.Using self-made thickener for printing,the paste had certain electrolyte resistance,clear printing pattern,high color yield,clear lines,soft feel and no edge penetration,which met the requirements of thickener for disperse dye printing.