自交联含氟丙烯酸酯共聚物的乳液合成与表征

Synthesis and Characterization of Self-Crosslinkable Fluorinated Acrylate Copolymer

以十二烷基硫酸钠(SDS)和OP-10为乳化剂,甲基丙烯酸十二氟庚酯(DFHM)为含氟单体,双丙酮丙烯酰胺(DAAM)和已二酰肼(ADH)为交联单体,采用饥饿态半连续种子乳液聚合方法,合成了一系列自交联含氟丙烯酸酯共聚物乳液。研究了氟单体对酮肼交联的影响以及交联反应对乳胶膜的表面性能以及力学性能的影响,采用FTIR、TEM、接触角测量仪对乳液及乳胶膜性能进行了表征。研究表明,酮羰基和酰肼的交联反应在室温下可以顺利进行;氟碳基团的引入,使一部分酮羰基被屏蔽,在一定程度上阻碍了交联反应的进行;通过引入氟碳基团可以极大地提高涂膜表面的疏水性,降低涂膜的吸水率,提高涂膜接触角;通过交联反应可以有效地提高氟碳乳液的综合性能,当DFHM为7.5%,DAAM为4%时,交联膜的接触角和吸水率分别达到96.8°和8.5%,拉伸强度为24.8MPa。

A series of synthesis and characterization of self-crosslinkable fluorinated acrylate copolymer was carded out by the starved semi-continuous seed emulsion polymerization.n-Butyl acrylate（BA）, with methyl methacrylate（MMA） and dodecafluoro- heptylmethacrylate（DFHM） served as the main monomers, sodium dodecyl sulfate SDS and OP-10 served as emulsifier, dodecafluoro-heptylmethacrylate（DFHM） served as Fluorinated monomer,diacetone acrylamide（DAAM） and adipic dihydrazide（ADH） served as crosslinking monomers. The effects of Fluorinated monomer to ketone-hydrazide crosslinking and the influences of ketone-hydrazide crosslinking to mechanical property and water absorption of latex film were studied. FTIR,TEM,SEM and contact angle measurement characterizing results displayed that the crosslinking reaction of keto group and hydrazine group can work smoothly at room temperature, the fluorocarbon hydrophobe shielded a fraction of keto group, blocked the crosslinking to a certain extent. The adding of fluorocarbon hydrophobe can increase coating surface＇ s hydrophobicity greatly, reducing its water absorption and increasing its contact angle. The crosslinking can improve the fluorocarbon emulsion＇ s comprehensive performance effectively, when the DFHM amount was 7.5 % （wt） and DAAM amount was 4 % （wt）, the crosslinked film exhibited good hydrophobic properties with the water contact angle of 96.8° , the water absorption of 8.5 %and the tensile strength of 24.8 MPa.