MAGNETIC COMPOSITES FROM RECYCLED MATERIALS

Abstract

In the conditions of the increasingly accentuated development of industrial and household products, the reuse of material waste with the aim of reducing environmental pollution has become an increasingly important necessity. This study presents the obtain of flexible magnetic composites based on cotton fabrics, acrylic rubber, powder from used tires and magnetite powder. The textile support was purchased from the local market (Tesatura Iași, Romania) and was made from 100% recovered cotton fibbers, with a mass of 143g∙m-2 and an average thickness of 0.28mm. The rubber was an acrylate type (AR) (NipolR AR 51) with the next characteristics: (ρ = 1100Kg∙cm−3 at 25oC, Mooney viscosity ML (1+4) at 100oC = 55; Tg = -4 oC). The rubber powder (PW) (with more natural rubber in composition) was obtained by grinding at temperature under 10 oC from used motorcycle tires obtained from the local market. The characteristic of rubber powder was: particles size up to 100 μm, moisture content 0.25 %, density (ρ) = 1060 Kg∙m-3. Magnetite was obtained according to the literature [1]. The composites were obtained at the weight ratio of PW/AR/ (20/80) with added magnetite powder according to desired mass fraction. The materials and composites were characterized using infrared spectroscopy (FTIR), dynamic light scattering (DLS) technique, X-ray diffraction (WAXD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). These composites can be used as raw materials for smart materials in the high-tech applications in the production of the DC motors, recording apparatus, magnetic screens, radar technology, memory devices, magnetic and electromagnetic sensors, materials for medicine and environmental protection or in the electronic devices where flexibility is required.