Showing papers on "Plastomer published in 2019"

Reclaimed Polymers as Asphalt Binder Modifiers for More Sustainable Roads: A Review

Abstract: The use of polymer-modified binders in asphalt mixtures has become more widespread due to their reduced thermal susceptibility and improved rutting and fatigue resistance. Nevertheless, their high cost limits their application, thus making the use of reclaimed polymers (RP) an interesting alternative for both reducing price and extending the service life of pavements. This paper; therefore, presents a comparative review of the recycled polymers most commonly studied as bitumen modifiers: polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), ethyl vinyl acetate (EVA), and ground tire rubber (GTR), in order to facilitate their selection and extend the use of the bitumen. The differences in terms of melting point, mixing conditions, and maximum quantity of added polymer are analyzed. Moreover, their effect on the mechanical behavior of the asphalt binders and their stability with and without the use of additives is presented. According to the literature revision, the performance of the new binder is more influenced by the kind of polymer that was incorporated and the mixing conditions than by the base bitumen that was chosen, although rheological evaluation is needed to fully understand the modification mechanisms of the modified binder. In general terms, plastomers have a stronger effect in terms of increasing the stiffness of the bitumen in comparison with crumb rubber (elastomers), thus providing an improved rutting resistance. The joint use of polyethylene (plastomer) and crumb rubber (elastomer) can be an interesting option for its recycling potential and mechanical performance, although further study is needed to achieve stable bitumen across the entire range of temperatures; additives, such as maleic anhydride (MA), are commonly employed to improve the stability of the binder and enhance its characteristics, but their use could limit the economic benefits of using recycled materials.

Evaluating Iraqi Modified Asphalt Concrete Moisture Resistance Based on Strength Ratio and Fracture Energy Parameters

Abstract: Two types of polymers (plastomer (functionalized polyethylene (PE)) and elastomer (styrene-butadiene-styrene (SBS))) were used for shifting up asphalt binder performance grade (PG) and tensile strength resistance (moisture damage) of the asphalt concrete mixture. It is found that adding 3.5% functionalized polyethylene (PE) polymer to the binder is more effective than adding 4% styrene-butadiene-styrene (SBS) to shift up asphalt PG by two grades to PG 76-16. Furthermore, the viscosity of the binder increased about 200% when using 4% SBS, while there is no significant effect on viscosity when 3.5% PE is used. Therefore, there is no need to increase the temperature of mixing and compaction which may affect polymers. The indirect tensile test was used for measuring tensile strength ratio of dry and wet samples (conditioned according to ASTM D4867) and found that this ratio increased by 10 to 18% when using 4% SBS and 3.5% PE, respectively. Fracture energy (area under the strength-strain curve) and elasticity were estimated for neat and modified mixture samples.

Response characteristic of the magnetorheological plastomer under different varying magnetic fields

Abstract: As a kind of novel magneto-sensitive smart soft material, magnetorheological plastomers (MPPs) have great application potential in the areas of absorber, damper and sensor. In this work, the mechanical behaviors of MRPs under several different varying magnetic fields were studied. The viscoelastic characteristic of the MRPs was seriously depended on the type of external magnetic field. A linearly changed magnetic field would cause the increase of zero field storage modulus ΔG0′ of MPRs for about 1 MPa, which would severely reduce the magnetorheological effect of MRPs (from 500% to 50%). The direction of the external magnetic field had no influence on the variation of G0′. While under the square wave magnetic field, no variation of the magnetic storage modulus was found when the external magnetic field was removed. A particle-level dynamics simulation was performed to observe the microstructure evolution of the MRP sample under different magnetic loading model. And a possible mechanism was proposed to explain the different residual storage modulus of the MRPs sample under different magnetic loading mode. The discovery would contribute to enhance the regulatory capacity of the MRP material in the application of the smart device.

Cement-based elastic grouting material suitable for repairing concrete cracks in deep water and preparation method thereof

Abstract: The invention relates to an engineering material and particularly relates to a grouting material for repairing concrete cracks in deep water. Cement, slag powder and rubber powder are taken as base materials, silica powder, gypsum powder, polyester fiber, a water reducing agent, water-based latex and a water-based curing agent are added according to a certain ratio, water is added, then the components are blended to form a groutable underwater non-dispersible plastomer, the plastomer is solidified to form an elastic solid capable of being bonded firmly to the interface of a concrete crack, andthe grouting material is mainly applied to the field of repair of concrete cracks in hydraulic engineering. The solidified cement-based elastic grouting material has the characteristics of high binding strength with underwater concrete, high head permeation resistance, high corrosion resistance, high elasticity, adaptability to concrete crack vibration and deformation, and the like.

Strip-shaped alumina agent, and extrusion molding method and application thereof

Abstract: The invention relates to the field of petrochemical catalysts, and discloses an alumina extrusion molding method, a strip-shaped alumina agent prepared by the method, and application of the strip-shaped alumina agent in catalysts. The alumina extrusion molding method includes the steps of (1) kneading alumina powder, protein-containing starch, dilute nitric acid and optional water to obtain a plastomer; (2) performing extrusion molding on the plastomer to obtain a wet molded body; (3) drying and calcining the wet molded body to obtain the strip-shaped alumina agent. The strip-shaped alumina agent prepared by the method has the advantages of uniform surface, less proneness to bonding and high mechanical strength.

Polyolefin blend compositions

Abstract: The present disclosure relates to polypropylene-based and polyethylene -based polyolefin compositions having improved impact properties. In at least one embodiment, a polyolefin composition includes an ethylene polymer, a propylene polymer, a propylene -based elastomer, and an ethylene-based plastomer. Compositions of the present disclosure can have one or more of: a Notched Charpy impact strength at 23°C of 8 kJ/m 2 or greater, a Notched Izod Impact Strength at 23°C of 6 ft-lb/in. or greater, an Unnotched Izod impact strength at 23°C of 10 ft-lb/in. or greater, and a portion of the composition having a submicron domain content of 50% or greater per mm 2 .

Silicon dioxide bar-shaped agent and extrusion moulding method and application thereof

Abstract: The invention relates to the field of petrochemical engineering catalysts and discloses a silicon dioxide extrusion moulding method, a silicon dioxide bar-shaped agent prepared by the method, and application of the silicon dioxide bar-shaped agent in catalysts. The silicon dioxide extrusion moulding method includes the steps of firstly, kneading silicon dioxide powder, starch containing protein, silica sol, optional dilute nitric acid and water to obtain plastomer; secondly, subjecting the plastomer to extrusion moulding to obtain a wet formed body; thirdly, drying and calcining the wet formedbody to obtain the silicon dioxide bar-shaped agent. By the method, the prepared silicon dioxide bar-shaped agent is uniform in surface, less prone to adhering and high in radial average mechanical strength.

Sealing member for use with fat containing compositions

Abstract: A sealing member for a container is provided having a bottom heat sealable layer. The sealing members herein may be suitable for sealing on glass containers and/or for use with fat and oil containing materials. The heat sealable layer may include ethylene acrylic acid and a polyolefin plastomer.

High temperature and high humidity resistant halogen-free flame-retardant polyether polyurethane elastomer and preparation method thereof

Abstract: The invention discloses a high temperature and high humidity resistant halogen-free flame-retardant polyether polyurethane elastomer which comprises the following components in parts by mass: 45-65 parts of a polyether polyurethane elastomer, 10-20 parts of a polyolefin plastomer, 5-10 parts of a compatilizer, 0.2-1 part of a cross-linking agent and 20-30 parts of a phosphorus-nitrogen flame retardant. POP (P-Octyl Phenol) of a low crystallinity degree and the polyurethane elastomer are commixed, under the condition that the raw materials are easy to obtain, the adsorption capability of the surface of a polymer with water molecules is reduced, and together with a chemical reaction grafting technique, the thermal resistance stability is improved while the compatibility is taken into account; meanwhile, due to adoption of the cross-linking agent, components are subjected to a cross-linking reaction, then the temperature resistance and thermal resistance of a finished product are improved, and the elastomer is qualified in testing of di85 for 1000 hours.

ZSM-5 molecular sieve strip forming agent and extrusion moulding method and application thereof

Abstract: The invention relates to the field of molecular sieves and discloses a ZSM-5 molecular sieve extrusion moulding method, a ZSM-5 molecular sieve strip forming agent prepared according to the method andapplication of the ZSM-5 molecular sieve strip forming agent to catalysts. The method includes steps: (1) kneading powdery ZSM-5 molecular sieves, protein-containing starch and water to obtain a plastomer; (2) subjecting the plastomer to extrusion moulding to obtain a wet moulded material; (3) drying and calcining the wet moulded material to obtain the ZSM-5 molecular sieve strip forming agent. The ZSM-5 molecular sieve strip forming agent prepared according to the method has advantages of surface uniformity, less proneness to adhesion and high mechanical strength.

Soft and transparent copolymers of propylene

Abstract: FIELD: manufacturing technology.SUBSTANCE: invention relates to a polypropylene composition (C) which is intended for making a film, a film made from said composition, as well as a method of producing a polypropylene composition (C). Polypropylene composition contains a heterophase propylene copolymer (RAHECO) and plastomer (PL). Heterophase propylene copolymer (RAHECO) contains a matrix (M) representing a disordered propylene copolymer (R-PP) and an elastomeric propylene copolymer (E) dispersed in said matrix (M). Comonomers of random copolymer of propylene (R-PP) and elastomeric copolymer of propylene (E) are ethylene and/or C-Colefins. Plastomer (PL) is a copolymer of ethylene and at least one C-Cα-olefin with density of less than 0.900 g/cmand melt flow rate MFR(190 °C/2.16 kg) from 10.0 to 40 g/10 minutes. Method of producing polypropylene composition (C) involves first polymerisation of propylene and ethylene and/or C-Cα-olefin in first reactor (R1). First fraction of a random copolymer of propylene (R-PP1) is obtained, which is transferred to a second reactor (R2). Further, polymerisation is carried out in the presence of a first fraction of a random copolymer of propylene (R-PP1) and ethylene and/or C-Cα-olefin. Second fraction of random copolymer of propylene (R-PP2) is obtained. First fraction of the random propylene copolymer (R-PP1) and the second fraction of the random propylene copolymer (R-PP2) form a random copolymer of propylene (R-PP), which is transferred to a third reactor (R3). After that, polymerisation is carried out in the presence of random copolymer of propylene (R-PP) and/or C-Cα-olefin. Third polymer fraction is obtained, which is an elastomeric copolymer (E). Propylene copolymer (R-PP) and the propylene elastomeric copolymer (E) form a heterophase propylene copolymer (RAHECO). Then a heterophase propylene copolymer (RAHECO) is mixed in the melt with a plastomer (PL). Film is made from said polypropylene composition.EFFECT: invention enables to obtain a polypropylene composition having improved optical and mechanical properties.13 cl, 1 dwg, 2 tbl, 3 ex