Rotational molding: A review of the models and materials

Ogila, K. O.; Shao, Mingfei; Yang, Wei; Tan, Jing

doi:10.3144/expresspolymlett.2017.75

Cited by 55 publications

(51 citation statements)

References 82 publications

(185 reference statements)

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“…The uniformity of wall thickness can be maintained to within ±10%, which is better than that normally obtainable through the blow molding process. Rotational molding also offers other significant advantages when compared with other molding techniques or thermoforming; costs for molds and tooling are relatively low, as well as the resin waste [26]. In recent years, preparation of polymer composites through rotomolding has received the attention of researchers.…”

Section: Introductionmentioning

confidence: 99%

Lightweight Poly(ε-Caprolactone) Composites with Surface Modified Hollow Glass Microspheres for Use in Rotational Molding: Thermal, Rheological and Mechanical Properties

et al. 2019

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In this work, novel composites based on poly(ε-caprolactone) (PCL) were prepared and characterized in terms of morphological, thermal, rheological and mechanical properties. Hollow glass microspheres (HGM), alone or surface modified by treatment with (3-aminopropyl)triethoxysilane (APTES) in order to enhance the compatibility between the inorganic particles and the polymer matrix, were used to obtain lightweight composites with improved properties. The silanization treatment implies a good dispersion of filler particles in the matrix and an enhanced filler–polymer adhesion. The addition of HGM to PCL has relevant implications on the rheological and mechanical properties enhancing the stiffness of the material. Furthermore, the presence of HGM strongly interferes with the crystallization behavior and thermo-oxidative degradation of PCL. The increase of PCL crystallization rate was observed as a function of the HGM amount in the composites. Finally, rotational molding tests demonstrated the possibility of successfully producing manufactured goods in PCL and PCL-based composites on both a laboratory and industrial scale.

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Section: Introductionmentioning

confidence: 99%

Lightweight Poly(ε-Caprolactone) Composites with Surface Modified Hollow Glass Microspheres for Use in Rotational Molding: Thermal, Rheological and Mechanical Properties

et al. 2019

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“…The use of rotomolding for thermosetting materials was also observed, such as epoxy resins, 39 polyurethane, 40 phenolic resins, 41 and unsaturated polyester. 1,42 Inorganic fillers used in rotomolded material include wollastonite 43 and halloysite clay, 44 calcium carbonate, 45 graphite, 30,46,47 silica, 48–51 carbon nanotubes, 52 glass fibers, 52–55 and carbon. 52…”

Section: Introductionmentioning

confidence: 99%

Rotomolding and polyethylene composites with rotomolded lignocellulosic materials: A review

León

Escócio

Visconte

et al. 2020

Journal of Reinforced Plastics and Composites

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Rotomolding is a versatile process used in the manufacture of thermoplastic polymeric materials to produce large hollow plastic parts. The aim of this review article was to discuss the rotomolding process and show the properties of the polyethylene composite and rotomolded lignocellulosic fibers, which are processed for prolonged periods under temperature. The main process parameters studied are the shaft speed of the equipment, molding temperature, polymer particle size, polymer melt flow index, and amount of material, which must be well controlled to achieve a non-degraded product with homogeneous thickness and no porosity. Rotomolded composites containing sisal, pine, coir, banana, flax, and maple wood fibers, among others, have been evaluated primarily for their mechanical (impact, flexural, and tensile strength) and morphological properties. The type, content, and treatment of lignocellulosic fillers are the most widely studied variables in polyethylene-based rotomolded composites. Fiber content was the variable that most influenced mechanical properties, particularly impact strength and hardness due to the voids formed by the hydrodynamic volume between the polymer matrix and lignocellulosic filler. Chemical treatment of the fiber by mercerization with NaOH made it more hydrophobic and the addition of maleic anhydride-grafted polyethylene as a coupling agent improved the interfacial adhesion between the non-polar polymer matrix and polar filler. However, the best mechanical property results were obtained with the use of maleic anhydride-grafted polyethylene.

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“…RM is a low-shear processing technology mainly used to produce medium-to-high size hollow plastic items. [1][2][3] The principle of RM is simple. In the first step of the process the hollow mold is charged with a known amount of plastic resin (in powder, granular, or liquid form).…”

Section: Introductionmentioning

confidence: 99%

“…Compared to other polymer processing technologies, RM offers several advantages, such as low residual stresses in the produced items, small amounts of plastic wastes, and not too expensive molds and machinery. 3 Furthermore, RM has made it possible the manufacturing of hollow single-piece items, closed or open, from small to large volume size (even more than 2 m 3 ) useful for different applications: industrial, agricultural and commercial storage tanks, automotive components, road barriers and cones, outdoor and indoor furnishings, sporting equipment. At present, RM industry has reached a high level of development, thanks to the introduction in the past decades of significant technical improvements, new machinery and molds as well as the availability of tailored materials.…”

Section: Introductionmentioning

confidence: 99%

Lightweight polyethylene‐hollow glass microspheres composites for rotational molding technology

Stagnaro¹,

Utzeri²,

Vignali

et al. 2020

J of Applied Polymer Sci

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Innovative composites based on polyethylene (PE) filled with hollow glass microspheres (HGMs) were formulated and successfully prepared as suitable plastic materials for rotational molding technology. The HGMs here used allow to attain lightweight materials with a reduced resin content and appealing aesthetical qualities. To enhance filler dispersion and phase adhesion, thus improving the ultimate properties of the composite materials, two compatibilization strategies were adopted: namely, surface modification of HGMs by dodecyl(triethoxy)silane or addition during mixing of a maleinized PE as insitu coupling agent. The effectiveness of the surface treatments on HGMs was assessed by attenuated total reflectance Fourier-transform infrared spectroscopy and thermogravimetric analysis investigations. PE-based composites at various HGMs contents (5, 10, and 20 wt%) were prepared by melt blending. Morphology of untreated and modified HGMs, their dispersion in the composites as well as filler/matrix adhesion were investigated by SEM microscopy. Thermal, rheological and mechanical properties of the composites were studied in comparison with neat PE. Rotational molding tests carried out both in laboratory and industrial site demonstrated the feasibility of producing lightweight plastic items (weight reduction up to 17%) of excellent aesthetics on a large scale.

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Rotational molding: A review of the models and materials

Cited by 55 publications

References 82 publications

Lightweight Poly(ε-Caprolactone) Composites with Surface Modified Hollow Glass Microspheres for Use in Rotational Molding: Thermal, Rheological and Mechanical Properties

Lightweight Poly(ε-Caprolactone) Composites with Surface Modified Hollow Glass Microspheres for Use in Rotational Molding: Thermal, Rheological and Mechanical Properties

Rotomolding and polyethylene composites with rotomolded lignocellulosic materials: A review

Lightweight polyethylene‐hollow glass microspheres composites for rotational molding technology

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