Novel Processing Additives for Rotational Molding of Polyethylene

Kulikov, O. L.; Hornung, Klaus; Wagner, Manfred

doi:10.3139/217.2296

Cited by 13 publications

(7 citation statements)

References 10 publications

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“…Polymers specially manufactured in the form of pellets have already been developed for rotomolding. 69,70 The mold is then hermetically sealed using clamps or screws. 71 Stage 2.…”

Section: Technical Aspects Of Rotomoldingmentioning

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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“…Polymers specially manufactured in the form of pellets have already been developed for rotomolding. 69,70 The mold is then hermetically sealed using clamps or screws. 71 Stage 2.…”

Section: Technical Aspects Of Rotomoldingmentioning

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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“…Surprisingly, we observed shorter times to sinter LLDPE particulates with additives of a composition that is identical to the proposed PPA for extrusion of LLDPE resins. Details of these experiments are published in [96].…”

Section: Mechanisms Of Lubricationmentioning

confidence: 99%

Low viscous hydrophilic processing additives for extrusion of polyethylene at reduced temperatures

Kulikov

Hornung

Wagner

2010

Polymer Engineering & Sci

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Industry is using fluorinated polymer processing additives (PPA) to delay the onset of sharkskin to higher rates of extrusion of PE resins. Yet it is necessary to keep elevated temperatures during extrusion to reduce apparent melt viscosity. We propose to use low viscous PPA made from reacting mixtures of polyethylene glycol with organic polyacids, phosphoric acid, and polyesters of oxiacids of Phosphorus. Surprisingly, extrusion pressures and apparent viscosity with the novel PPA at reduced temperatures are less, than at elevated temperatures. In total, extrusion pressures can be reduced 2-5 times for concentrations of PPA from 0.1 to 0.5 wt%, while sharkskin melt fracture can be eliminated for concentrations of PPA above 0.02 wt%. Extrusion with the novel PPA at reduced temperatures potentially increases productivity, reduces production cost, and allows processing of PE resins of higher MW and highly filled polymer composites.The use of novel PPA is a challenging opportunity to simplify processing of PO resins. The use of low viscous PEG in the composition of PPA with existing machinery has to be combined with changes in the die design for film blowing, blow molding, and pipe extrusion to extract

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“…More than 85% of the publications wherein the manufacturing method is rotational molding choose Polyethylene (PE) [21][22][23]; however, using other polymers is an interesting matter. A special PA11 powder (Rilsan® Roto 11) grade was used for rotational molding [24].…”

Section: Introductionmentioning

confidence: 99%

Rotational Molding of Polyamide-12 Nanocomposites: Modeling of the Viscoelastic Behavior

et al. 2020

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Nowadays, polyamide 12 (PA-12) is considered as an interesting polymer in the rotomolding process to manufacture different pieces like the liner part in the storage hydrogen tank (type IV). In this study, the pure polyamide-12 and PA12 pieces, incorporated with 0.5%, 1% and 3% wt Nano Carbon Black (NCB), were manufactured by the rotomolding process. Different rotomolding parameters such as heating temperature, time of heating, and cooling rate have been optimized to obtain the ideal piece. The effect of volume fraction of NCB in terms of physicochemical and mechanical properties has been studied. Afterward, the optimal volume fraction of NCB is revealed using different characterization methods. The tensile results specified the addition of NCBs until 0.5% improved the tensile behavior. The addition of NCBs more than 0.5% decreases the mechanical properties in terms of failure stress and strain, while it has no significant effect on the elastic modulus of PA-12. The bi-parabolic the Perez model has been used to study the viscoelastic behavior of PA-12 using the Cole-Cole method. The constants of the Perez model indicate a good correlation between viscoelastic experimental results and the model used.

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Novel Processing Additives for Rotational Molding of Polyethylene

Cited by 13 publications

References 10 publications

Rotomolding and polyethylene composites with rotomolded lignocellulosic materials: A review

Rotomolding and polyethylene composites with rotomolded lignocellulosic materials: A review

Low viscous hydrophilic processing additives for extrusion of polyethylene at reduced temperatures

Rotational Molding of Polyamide-12 Nanocomposites: Modeling of the Viscoelastic Behavior

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