以偶氮二异丁腈为引发剂,烯丙基聚氧乙烯醚(APE)、α-甲基苯乙烯(AMS)、甲基丙烯酸(MA)为主要单体,采用溶剂聚合法合成了一系列高分子丙烯酸嵌段共聚分散剂。分别利用傅里叶红外光谱(FT-IR)和凝胶渗透色谱(GPC)证实了丙烯酸嵌段共聚分散剂结构及测量了分散剂的分子量及分布。分别探讨了不同的亲水基与疏水基单体的化学计量比、不同分子量及分子量分布的分散剂对有机炭黑和无机颜料浆的分散效率及对涂料耐水性的影响。将试验合成的分散剂D3与市售水性通用型分散剂进行性能比较,表明其综合性能优于市售水性通用型分散剂,实用价值明显。

Using azodiisobutyronitrile as initiator,a series of acrylic block copolymers were synthesized by solvent polymerization with allyl polyoxyethylene ether(APE),Alpha-Methylstyrene(AMS)and methacrylic acid(MA)as main raw materials.The structure of acrylic block copolymerization dispersant was confirmed by Fourier infrared spectroscopy(FT-IR)and gel permeation chromatography(GPC),and the relative molecular weight and PDI of the dispersant were measured.The effects of stoichiometric ratios of hydrophilic and hydrophobic monomers,relative molecular weight and PDI of dispersants on the dispersion efficiency of organic carbon black and inorganic pigment pastes and on the water resistance of coatings were discussed.The performance of the synthesized dispersing agent D3 was compared with that of the commercially available water-based universal dispersing agent.The results showed that the synthesized dispersing agent D3 was superior to that of the commercially available water-based universal dispersing agent,and its practical value was obvious.