Preparation of microencapsulated aluminum hypophosphite and its flame retardancy of the unsaturated polyester resin comp
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Preparation of microencapsulated aluminum hypophosphite and its flame retardancy of the unsaturated polyester resin composites Guorong Zhang1 · Yuan Yu1,2 · Yunshu Zhang1 · Zhongwei Chen1 · Tingting Chen1 · Juncheng Jiang1,2 Received: 5 May 2020 / Revised: 24 August 2020 / Accepted: 23 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A novel microencapsulated flame retardant (CP@AHP), aluminum hypophosphite (AHP) as the core material and chlorinated paraffin (CP) as the shell material, was successfully prepared and applied in unsaturated polyester resin (UPR) to prepare the UPR composites in this paper. The aim of microencapsulation AHP was to enhance the fire safety of the UPR composites. The structure, morphology and thermal behavior of CP@AHP were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, energydispersive X-ray spectroscopy and thermogravimetric analysis (TG), respectively. The thermal and flame-retardant properties of the UPR composites were evaluated by TG and cone calorimetry test (CCT), respectively. At the same time, the tensile and flexural properties of UPR composites were tested. Compared with pure UPR, the residue at 800 °C of UPR/CP@AHP-1:2 (UPR/CP@AHP with the mass ratio of CP:AHP = 1:2) under nitrogen atmosphere is from 6.9 to 31.6. The CCT results showed that the peak heat release rate (pHRR) and total heat release of UPR/CP@ AHP-1:2 decreased by 58.4 and 46.1%, respectively, in comparison with pure UPR. The results of TG and CCT indicated that CP@AHP could improve the thermal stability and flame retardancy of the UPR composites. Finally, based on the above results, the flame retardancy mechanism of CP@AHP was proposed. Keywords Unsaturated polyester resin · Microencapsulation · Flame retardancy · Aluminum hypophosphite · Chlorinated paraffin
* Yuan Yu [email protected] 1
College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211816, China
2
Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, Nanjing Tech University, Nanjing 211816, China
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Vol.:(0123456789)
Polymer Bulletin
Introduction Unsaturated polyester resin (UPR) is one of the most used types of thermosetting resins and widely used in fiber-reinforced polymer/plastic (FRP), artificial stone and handicrafts [1]. However, the molecular structure of UPR determines its highly flammable and low limiting oxygen index (LOI) (19%) [2, 3]. Therefore, it is of great significance to research the flame-retardant properties of the UPR composites and expand their application in various fields of the national economy [2–6]. Aluminum hypophosphite (AHP) is a new type of flame retardant. Due to its good thermal stability, high flame-retardant efficiency and low water solubility of the polymer [7–12], it has been widely used as a flame retardant in UPR [7], epoxy resins (EP) [13], polyurethanes (PU) [8, 10], polyamide-6 (PA-6) [11, 14, 15] and other polymers [16–20]. Wu et al. [7] synthesized
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