Disclosed is an infill for an artificial turf field, the infill comprising: from about 40 wt. % to about 60 wt. % of a polyvinyl chloride resin; from about 5 wt. % to about 30 wt. % of a plasticizer derived from a naturally occurring source; from about 2 wt. % to about 10 wt. % of a reflective pigment; from about 0.01 wt. % to about 0.1 wt. % of a blowing agent; and from about 5 wt. % to about 30 wt. % of a filler. The infill is pelletized and maintains the temperature of an artificial turf field, when disposed throughout the artificial turf field, at a temperature about 15° F. to about 25° F. less than a temperature of a comparative artificial turf under substantially similar ambient and environmental conditions, wherein a comparative infill of the comparative artificial turf consists essentially of crumbed rubber infill.

A method for preparing a thermoplastic polyurethane elastomer material with micro air holes is provided. The method comprises the following steps: (1) is feeding liquid raw materials such as diisocyanate molecules and solid additives into a double-screw reactor to trigger a polymerization type chain extension reaction and then obtain a macromolecular weight hot melt. (2) is pushing the macromolecular weight hot melt into a mixing extruder and allowing the reaction to continue to obtain a macromolecular thermoplastic polyurethane melt. (3) is continuously adding the obtained macromolecular thermoplastic polyurethane melt together with polymer particles into a foaming extruder, and extruding the high-pressure hot melt from a mold head into an underwater granulation chamber. (4) is delivering the particles obtained after granulation into a separator by process water via a multi-stage pressure-release process water pipeline, separating, screening and drying the required particles to obtain the target product.

A foamable composition comprising at least one cellulose acetate, a plasticizer, a nucleating agent, and either a chemical blowing agent or a physical blowing agent is disclosed. The composition is formed into foamed articles that are biodegradable.

Described herein is a Low TVOC flame-retardant polyurethane spray foam system, including at least one isocyanate as isocyanate component, and at least one substance reactive toward isocyanate, chain extender and/or crosslinking agent, flame retardant, blowing agent, catalysts, and additives and/or auxiliaries, as resin components, where the flame retardant includes expandable graphite and melamine, the amount of expandable graphite is in the range of from 5 wt % to less than 30 wt %, and the amount of melamine is in the range of from greater than 5 wt % to 30 wt %, each based on the total weight of the resin components. Also described herein are a polyurethane spray foam produced therefrom, the preparation thereof, and a method of use thereof in the application of heat insulation, sound insulation, cavity filling and damping packing.

The present application relates to the technical field of wastewater treatment and rapid pollutant detection, in particular to a chitosan-polyacrylamide composite porous hydrogel, preparation and use thereof, and a metal ion-adsorbing and detecting reagent and method. The chitosan-polyacrylamide composite porous hydrogel of the present application is prepared by in situ polymerization of a chitosan sol, an acrylamide, a crosslinking agent and a surfactant into a mixed solution comprising liquid droplets, followed by steps of curing, washing, and freeze-drying. The present application further provides a metal ion-detecting reagent, which is obtained by adsorbing a color developing agent into the chitosan-polyacrylamide composite porous hydrogel as described above, wherein the color developing agent is a dye that changes color when encountering metal ions. The chitosan-polyacrylamide composite porous hydrogel of the present application has balanced mechanical properties and porosity.

This invention relates to a foaming composition, comprising at least one ethylene-vinyl acetate (EVA) copolymer; at least one foaming agent; at least one peroxide compound; at least one polyamine; at least one crosslinking enhancer; at least one primary antioxidant; and at least one secondary antioxidant; the content of the crosslinking enhancer is from 0.1 to 3% by weight based on the total weight of the composition. A foaming article cured from the foaming composition under the temperature range of 80 to 120° C. according to the present invention exhibits high initial volume expansion ratio at the baking window from 130 to 200° C. and shows excellent stability after storage.

Expanded polypropylene beads are prepared from composite particles using a high-temperature and high-pressure kettle type foaming method. The composite particles include a core layer and a skin layer. The core layer includes one or more of the following components, for example in percentage by mass: 20-40% of polypropylene A, 60-80% of polypropylene B, 0-20% of polypropylene C and 0-10% of a thermal-conductive additive. The skin layer includes one or more of the following components, for example in percentage by mass: 40-80% of polypropylene D and 20-60% of polypropylene E. The composite particles are of a multi-layer structure with the skin layer covering the core layer. A resin of the skin layer is easy to sinter at low temperature and in compatibility with a main substrate resin of the core layer. The core layer resin adopts a selected mixture, which promotes molding expansibility.

Expanded polyethylene resin particles include an antistatic agent and a base resin. The expanded polyethylene resin particles are obtained by expanding polyethylene resin particles including the antistatic agent and the base resin, the polyethylene resin particles having a storage modulus of elasticity of 900 to 5000 Pa at an angular frequency of 1 rad/sec in dynamic viscoelastic behavior measurement at 190° C. and a storage modulus of elasticity of 100000 Pa or less at an angular frequency of 100 rad/sec in dynamic viscoelastic behavior measurement at 190° C. The expanded polyethylene resin particles have a low temperature side melting peak and a high temperature side melting peak on a differential scanning calorimetry (DSC) curve obtained when a temperature of the expanded polyethylene resin particles is increased from 20° C. to 220° C. at a heating rate of 10° C./min.

A method of producing a polyethylene resin expanded molded product includes filling a mold with expanded polyethylene resin particles, wherein an internal pressure of 0.12 to 0.16 MPa is applied to the expanded polyethylene resin particles in the mold, and forming the polyethylene resin expanded molded product by heating the expanded polyethylene resin particles and fusing the expanded polyethylene resin particles. The expanded polyethylene resin particles includes 100 parts by weight of a polyethylene resin, 0.08 to 0.25 parts by weight of a cell nucleating agent, 0.3 to 0.8 parts by weight of a polyhydric alcohol fatty acid ester, and 0.01 to 10 parts by weight of a hydrophilic compound, each of the expanded polyethylene resin particles having a weight of 2.5 to 3.5 mg. The polyethylene resin expanded molded product has a density of 0.017 to 0.021 g/cm.sup.3 and a thickness of 10 to 40 mm.

An expanded polyolefin resin particle is obtained by expanding a polyolefin resin particle using water and/or an inorganic gas as a foaming agent. The polyolefin resin particle includes a polyolefin resin, a product obtained by heating and kneading a mixture, and a water absorbing substance, wherein the mixture includes a first polypropylene resin, a polypropylene wax, a polyorganosiloxane including at least one silicon-atom-bound radical polymerizable functional group per molecule, and an organic peroxide.