The objective of this research was to enhance the corrosion resistance and mechanical properties of silica nanoparticles modified by a fluoropolymer (polyhexafluorobutyl acrylate, PHFBA) by incorporating them into a waterborne epoxy resin (WEP) coating system. Initially, polyhexafluorobutyl acrylate (PHFBA)-modified silica nanoparticles were synthesized using a two-step method, involving the grafting of 3-(isobutylloxy) propyl trimethoxysilane (KH570) onto SiO to produce SiO@KH570, followed by a random copolymerization of SiO@KH570 with hexafluorobutyl acrylate (HFBA) to obtain the fluoropolymer-modified SiO (FSiO). Subsequently, the chemical structure and elemental composition of SiO, as well as the prepared SiO@KH570 and FSiO nanoparticles, were comprehensively investigated. Moreover, FSiO/WEP composite coatings with different amounts of fluoropolymer-modified nanofillers and x-FSiO/WEP composite coatings with varying amounts of FSiO nanofillers were prepared and characterized. The findings revealed that the functionalized FSiO exhibits superior dispersion, interface, and size effects, significantly enhancing the overall performance of WEP coatings. Notably, when 0.1 wt% FSiO nanofiller was incorporated, the resulting 0.1-FSiO/WEP composite coating demonstrated a considerable impedance modulus (1.171 × 10 Ω∙cm), relatively low water absorption rate (about 11 % after 20 d of immersion in water), and robust mechanical properties: a tensile strength of 6.07 MPa and an elongation at break of 37.36 %. Moreover, the hardness and adhesion of the composite coating remain unaltered. Furthermore, after 20 days of salt spray testing, the electrochemical impedance still reached 8.765 × 10 Ω∙cm, indicating a favorable long-term anti-corrosion capability. Consequently, the integration of fluoropolymer-modified nanoparticles in water-based epoxy resins holds great potential.

中文翻译：

---

掺入含氟聚合物改性二氧化硅纳米填料改善水性环氧树脂的防腐性能

本研究的目的是将含氟聚合物（聚丙烯酸六氟丁酯，PHFBA）改性的二氧化硅纳米颗粒纳入水性环氧树脂（WEP）涂料体系中，以提高其耐腐蚀性和机械性能。最初，采用两步法合成了聚丙烯酸六氟丁酯（PHFBA）改性二氧化硅纳米颗粒，其中包括将3-（异丁氧基）丙基三甲氧基硅烷（KH570）接枝到SiO上生成SiO@KH570，然后进行SiO@的无规共聚。 KH570与丙烯酸六氟丁酯(HFBA)反应得到含氟聚合物改性的SiO(FSiO)。随后，对SiO以及制备的SiO@KH570和FSiO纳米粒子的化学结构和元素组成进行了全面研究。此外，制备并表征了具有不同含量的含氟聚合物改性纳米填料的FSiO/WEP复合涂层和具有不同含量的FSiO纳米填料的x-FSiO/WEP复合涂层。研究结果表明，功能化 FSiO 表现出优异的分散、界面和尺寸效应，显着提高了 WEP 涂层的整体性能。值得注意的是，当掺入 0.1 wt% FSiO 纳米填料时，所得的 0.1-FSiO/WEP 复合涂层表现出相当大的阻抗模量（1.171 × 10 Ω·cm）和相对较低的吸水率（在水中浸泡 20 d 后约为 11%）。 ）和强大的机械性能：拉伸强度为 6.07 MPa，断裂伸长率为 37.36 %。此外，复合涂层的硬度和附着力保持不变。此外，经过20天的盐雾测试，电化学阻抗仍达到8.765×10Ω·cm，具有良好的长期防腐能力。因此，含氟聚合物改性纳米粒子在水基环氧树脂中的整合具有巨大的潜力。