Modified magnesium hydroxide encapsulated by melamine cyanurate in flame-retardant polyamide-6
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ORIGINAL PAPER
Modified magnesium hydroxide encapsulated by melamine cyanurate in flame-retardant polyamide-6 Tao Zheng 1 & Wenning Xia 1 & Jing Guo 1 & Yaochi Liu 1 Received: 7 January 2020 / Accepted: 26 May 2020 # The Polymer Society, Taipei 2020
Abstract In this paper, a novel modified magnesium hydroxide (MH) was successfully prepared with γ-(2,3-epoxypropoxy)propyl trimethoxysilane (KH-560) via the wet process. The optimum modification conditions were obtained as follows: KH-560 dosage of 1.0 wt% at 80 °C for 2 h. The modified MH encapsulated by melamine cyanurate (MCA) at the mass ratio was 1:3. Using polyamide-6 (PA6) as matrix, MCA-MH as flame retardant, a series of flame-retardant PA6/MCA-MH composites were prepared by melt blending and injection molding. The flame retardancy, thermal property, and mechanical properties of PA6/ MCA-MH composites were investigated. The investigation results showed that MCA-MH could effectively suppress the meltdipping behavior and reinforce flame retardancy of PA6. PA6/MCA-MH composites successfully passed the vertical combustion (UL-94) V-0 rating and limiting oxygen index (LOI) as high as 32.5% with the incorporation of 20 wt% of MCA-MH. The residues of the PA6/MCA-MH composites were increased with the increasing MCA-MH. What’s more, the mechanical properties of the composites were also enhanced because of MCA-MH had better compatibility and dispersion in the PA6 matrix compared with MH. Therefore, PA6/MCA-MH composites with excellent flame retardancy while have maintained optimal mechanical properties can be obtained. Keywords Modified magnesium hydroxide . melamine cyanurate . flame-retardant polyamide-6 . halogen-free
Introduction As one of the earliest industrial polyamide products, polyamide-6 (PA6) has been extensively applied in automobiles, household appliances due to its wear resistance, good self-lubrication, high tensile strength, and high impact toughness mechanical properties [1–5]. However, their application has been limited in the areas with high flame-retardant requirements owing to it is flammable with limited oxygen index (LOI) of 23% and only UL94-V2 rating can be achieved. Therefore, improving the flame retardancy of PA6 has attracted a lot of researcher’s attention in recent years. Adding flame retardants is an effective method to reduce the flammability of PA6. So far, various flame retardants have been developed, such as halogen flame retardants, phosphorous flame retardants, inorganic flame retardants, and nitrogen
* Yaochi Liu [email protected] 1
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
flame retardants. Unfortunately, some flame retardants, such as halogen flame retardants. Although they can endow polymer materials with high flame retardancy, they also have some obvious disadvantages, such as releasing toxic gases, producing smoke, and producing corrosive substances [6, 7]. From the perspective of safety and environmental protection, halogen-free flame retardants have become an inevi
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