Acrylate–vinylidene chloride copolymers derived from corresponding water‐borne latexes: Influence of acrylate units on their potential as heavy‐duty anticorrosive coating materials

Abstract

A series of aqueous latexes with solid contents of 56%-59% were synthesized by binary emulsion copolymerization of vinylidene chloride (VDC) with an acrylate, namely methyl acrylate (MA), ethyl acrylate (EA), butyl acrylate (BA), hexyl acrylate (HA), or 2-ethylhexyl acrylate (EHA). Differential scanning calorimetry (DSC) and Fourier-transform infrared (FTIR) spectroscopy showed that the acrylate units with short ester side-chains, such as MA and EA, made the copolymers hard and the crystallization tendency of their PVDC segments was reduced. Hydrophobic acrylates with relatively long ester groups, such as HA and EHA, gave flexible copolymers, and favored the crystallization of their PVDC segments. BA endowed the copolymers with medium flexibility and crystallization tendency. As coating materials, the copolymers bearing MA and EA adhered poorly to the tinplate before or after 100 hr of salt-spray corrosion, whereas those bearing BA, HA, or EHA showed good adhesion to tinplate when they had little or no crystallinity. After 100 hr of salt-spray corrosion, only BA-VDC80, containing 80% VDC, retained both excellent adhesion to metal and excellent barrier performance. Further study demonstrated that BA-VDC80 could protect tinplate from rusting for at least 250 hr under harsh salt-spray corrosion. Scanning electron microscopy, FTIR-attenuated total reflectance spectroscopy and DSC were used to evaluate the corroded BA-VDC80 film.

Dual-Emissive Coating Films Prepared from Water-Borne Latexes of Acrylate–Vinylidene Chloride Copolymers: Their Room-Temperature Phosphorescence Properties and Sensing Abilities toward Solvents

“…The coating films formed from the HBN-doped acrylate–VDC copolymers were dual-emissive, including a normal fluorescence emission and RTP emission under ambient condition. Compared with the ever-used hydrophobic polymer matrices in literatures, − acrylate–VDC copolymers were less rigid due to their T g values around, even less than room temperature . Unlike the trend reported in the literature that increasing T g of polymers favored the RTP property, in the acrylate–VDC copolymer systems, a T g increase could not guarantee the effective RTP emission.…”

“…N -Hydroxyethyl 4-bromo-1,8-naphthalimide (HBN) was prepared according to the literature method . The aqueous latexes of acrylate-VDC copolymers were prepared by the emulsion polymerization as reported previously . The aqueous latexes of acrylate–VDC copolymers doped with HBN were prepared in the same way as the aqueous latexes of acrylate–VDC copolymers and only differed in the addition of HBN to the pre-emulsified monomer solution.…”

“…Copolymer latexes of vinylidene chloride (VDC) with (meth)­acrylate, acrylonitrile, or vinyl chloride have been targeted for the applications as coatings for paper, fibers, or packaging. − Moreover, the water-borne latexes of acrylate–VDC copolymers have been explored for the application as heavy-duty coating materials for metal protection. − The N -substituted 4-bromo-1,8-naphthalimides have been verified to be efficient RTP phosphors, which also had characteristics of good stability and facile preparation. ,− Thus, in this contribution, N -hydroxyethyl 4-bromo-1,8-naphthalimide (HBN) was chosen as RTP phosphor to dope the water-borne latexes of acrylate–VDC copolymers. The coating films formed from the HBN-doped acrylate–VDC copolymers were dual-emissive, including a normal fluorescence emission and RTP emission under ambient condition.…”

Study on a Novel Recyclable Anticorrosion Gel Coating Based on Ethyl Cellulose and Thermoplastic Polyurethane

“…The heavy-duty anticorrosion coatings are usually used to protect metallic constructions in marine corrosion [1][2][3][4]. However, for the mentioned particular structures, the good shielding property of anticorrosion coating not only depends on the nature of coating material but also requires high thickness and good elasticity of coating to cover the crevice and to withstand the structural deformation [5][6][7][8]. The recycling property of coating is desired because the disassembly and assembly operation of these connection structures during the regular maintenance will destroy the ordinary anticorrosion coating.…”

“…At present, most of the heavy-duty anticorrosive coatings are solvent-based crosslinking curing resins, such as epoxy resin [5,6], polyurethane [9], and acrylic resin [8,10]. In the process of connection structures installation and later maintenance, the disassembly and assembly operation are easy to cause damage to these coatings and reduce the protection performance of the coating.…”