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采用原位无皂乳液聚合工艺,以丙烯酸单体为溶剂,双丙酮丙烯酰胺(DAAM)和己二酰肼(ADH)为交联体系得到室温自交联水性含氟聚氨酯聚丙烯酸酯(WFPUA)。通过红外光谱(FTIR)、透射电镜(TEM)和原子力显微镜(AFM)对聚合物结构进行了表征。同时,考察了含氟量、酮肼交联比例对WFPUA胶膜性能的影响。结果显示,当含氟量为8%、酮肼摩尔比为1∶1时,接触角能达到110.5°,吸水率下降至8.8%,抗拉强度从18.12 MPa提高至28.55 MPa。热重分析表明,酮肼交联的引入有效提高了乳胶膜的热稳定性。
In-situ soap-free emulsion polymerization was used to obtain self-crosslinking aqueous fluorinated polyurethane polyacrylate (WFPUA) with acrylic monomer as monomer, diacetone acrylamide (DAAM) and adipic acid hydrazide (ADH) as crosslinking system. The polymer structure was characterized by infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and atomic force microscopy (AFM). At the same time, the influence of the content of fluorine and the proportion of ketonic hydrazine on WFPUA film was investigated. The results show that the contact angle can reach 110.5 ° when the fluorine content is 8% and the molar ratio of ketohydrazide is 1: 1. The water absorption decreases to 8.8% and the tensile strength increases from 18.12 MPa to 28.55 MPa. Thermogravimetric analysis showed that the introduction of ketonic hydrazine cross-linking effectively enhanced the thermal stability of latex films.