PE/PP薄膜油墨用低温自交联丙烯酸酯乳液的合成及表征

Synthesis and Characterization of Low-temperature Self-crosslinkable Acrylate Emulsion for PE/PP Film Ink

摘要:

以甲基丙烯酸甲酯、丙烯酸丁酯、双丙酮丙烯酰胺、丙烯酸为共聚单体，采用半连续种子乳液聚合工艺合成PE/PP薄膜油墨用低温自交联丙烯酸酯乳液，采用FTIR、TEM、DSC等对乳液结构及固化性能进行了表征。结果表明：随着w(DAAM)增加，乳液粒径和凝胶率均有不同程度的增大，油墨的耐水时间和附着牢度先增大再减小，当w(DAAM)为2%，m(ADH)/m(DAAM)为0.8时，油墨附着牢度＞90%，耐水时间≤150h，揉搓牢度合格；FTIR结果表明乳液在固化成膜过程中发生酮肼交联反应，DSC结果表明发生酮肼交联反应后聚合物的玻璃化转变温度提高5.2℃，TEM结果表明乳液粒子呈规则球形，有明显的核壳结构。

Abstract:

The low-temperature self-crosslinkable acrylate emulsion with core-shell structure was synthesized by semi-continuous seed emulsion polymerization technology, using methyl methacrylate (MMA), butyl acrylate (BA), methacrylic acid (MAA), diacetone acrylamide (DAAM) as comonomers, and characterized by FTIR, TEM and DSC. The results show that the particle size and gel amount increased with w(DAAM). When w(DAAM)= 2%, m(ADH)/m(DAAM)=0.8, the adhesion was up to 90%, water resistant time was up to 150h. FTIR test confirmed that crosslinking reaction between DAAM and ADH could occur when film forming at low temperature. DSC analysis indicated that the glass transition temperature of the film after crosslinking is increased by 5.2℃. The TEM images confirmed spherical latex particles with core-shell structure.