The invention discloses a method for producing polystyrene extruded sheets by using a carbon dioxide foaming agent, which relates to a method for producing polystyrene extruded sheets. In the method, a polystyrene melt is used as a main ingredient, carbon dioxide is used as a main foaming agent, and a polymer melt of at least one of other foaming agents is used. The method comprises: mixing polystyrene particles and a processing assistant in a stirring and loading machine, feeding the mixture into a feed hopper of a first extruder, and heating in the first extruder to melt and mix the polystyrene material to obtain a polymer melt; mixing carbon dioxide with other foaming agents, and injecting the mixture into the melt from the middle section of the first extruder by using a foaming agent injection system to obtain foamable gel; raising the pressure of the system by regulating the first extruder to mixing the foaming agents and the polystyrene melt; and mixing and cooling in a second extruder and a static mixer to reduce the temperature of the gel to an optimal foaming temperature, and extruding the cooled gel through a mold to obtain the polystyrene extruded sheets.

Method for producing polystyrene extruded sheets by using carbon dioxide foaming agent

A method for producing particles, including: bringing a compressive fluid into contact with a pressure plastic material, so as to produce a melt of the pressure plastic material; and discharging the melt of the pressure plastic material by differential pressure to a space, so as to form particles, wherein the discharging includes at least one of (A) discharging the melt of the pressure plastic material while a compressive fluid is supplied to the melt of the pressure plastic material, and (B) discharging the melt of the pressure plastic material through one or more through-holes, to which vibration is applied, so as to change the shape of the melt of the pressure plastic material from a columnar shape, through the columnar shape with constrictions, into a particle shape.

Method for producing particles, method for producing toner, and apparatus for producing particles

The invention discloses a method for manufacturing carbon microspheres by using waste macromolecules as raw materials. The method is characterized by comprising the following steps of: sealing 75 to 300g/L of waste polyester, polypropylene or polyethylene and 300 to 600g/L of dry ice into a stainless steel autoclave based on the volume of the autoclave, heating the mixture to between 500 and 650 DEG C, preserving the heat for 180 minutes, and then cooling the mixture to room temperature to obtain micro-scale carbon spheres; annealing the prepared micro-scale carbon spheres for 1 hour under the vacuum condition of 1,500 DEG C to further obtain laminated carbon microspheres; and performing oxidation treatment of a Hummers method on the laminated carbon microspheres for 24 to 72 hours to obtain ellipsoidal laminated graphite carbon oxide microspheres. The method can improve the yield of solid carbon and greatly reduce the formation of carbon dioxide, and is suitable for industrialized production; and the obtained product has wide application prospect in the fields of adsorption and desorption, lithium ion batteries, catalyst carriers and the like.

Method for manufacturing carbon microspheres by using waste macromolecules

Here, we present a novel method to control the size of CuO nanoparticles (NPs) and Cu loading in SBA-15 via fast desorption of supercritical CO2 (scCO2). After calcination, the average size of the CuO NPs (6.47 ± 2.89∼2.18 ± 0.97 nm) decreased with the increase of the depressurization rate (20-14 MPa, 50 °C) from transmission electron microscopy, and the x-ray diffraction results also indicated the decrement of the average particle size (8.6∼4.3 nm by a Scherrer equation). Two reduction peaks situated at 195 °C and 220 °C were found from the temperature-programmed reductions with H2 profiles, and the intensity of the low-temperature peak increased with increasing the rate for a profile. The hydrogenation of dimethyl oxalate (DMO) to ethylene glycol (EG) was selected to evaluate the catalytic activity of the as-prepared sample. The reaction was conducted at p = 3.0 MPa, T = 200 °C, H2/DMO = 120, the weight hourly space velocity  = 1.2 h-1, and the EG selectivity remained at about 90% for over 100 h. The fast desorption of scCO2 caused mechanical perturbations and crystallization of the adsorbed salt ions on the supports, decreasing the particle size and increasing Cu loading (8∼12 wt%).

Desorption-dominated synthesis of CuO/SBA-15 with tunable particle size and loading in supercritical CO2.

We report the formation of self-organized nanostructured spherulitic crystal pattern in a modified Belousov–Zhabotinsky (BZ) type system. In liquid phase, we observed the reaction system to exhibit well distinguishable spatial patterns including stripe and hexagonal structures. The solid phase nucleation was found to occur in the colloidal phase and nanostructured spherulitic crystal patterns were obtained as one of the final products. Transmission electron microscopy, scanning electron microscopy, optical microscopy, powder X-ray diffraction and Fourier transform infrared spectroscopy were used to characterize the spherulitic crystal pattern. The average diameter of the grown crystals was found to be ∼30–100 nm. In situ UV–Visible spectroscopic measurement exhibited damped oscillatory nature corresponding to ferroin in the reaction system. This oscillation was found to be well conjugated to the spherulitic structures. The paper elucidates the roles of the various possible factors behind such phase-transformation along with the plausible explanation of the corresponding reaction pathways.

Self-organized nanostructured spherulitic crystal pattern formation in Belousov–Zhabotinsky type reaction system

We developed an efficient MoS2 nanosheet electrode coupled with CeO2via a hydrothermal process to facilitate water adsorption and dissociation, which displayed good HER activity and stability at a large current density of 500 mA cm-2. In situ Raman spectroscopy confirmed the formation of hydroxide ions based on the strengthening of the Ce-O bond during the HER.

Coupling MoS2 nanosheets with CeO2 for efficient electrocatalytic hydrogen evolution at large current densities.

The invention relates to a process for preparing polymer ultra-fine particles, in particular to a process for preparing polymer ultra-fine particles by applying supercritical fluid, which utilizes the supercritical fluid to process one type of polymer or a mixture of various types of polymers to prepare polymer ultra-fine particles or polymer microcapsule ultra-fine particles. As dissolubility to polymer is increased in a supercritical fluid state, polymer can be precipitated from the supercritical fluid after the supercritical fluid state is eliminated, and then polymer ultra-fine particles or polymer microcapsule ultra-fine particles with high degree of crystallinity and fine shape can be prepared after thermostatic treatment. Besides, the prepared ultra-fine particles are narrow in distribution, and shapes thereof can be controlled into regular spheres. The process is simple in technique and easy in operation without complex devices, the prepared ultra-fine particles are regular in shapes, stable in crystalline form, higher in crystallinity and higher in application value and are adoptable to industrialized production.

Process for preparing polymer ultra-fine particles by applying supercritical fluid

As a special two-dimensional layered perovskite material, CsPb2Br5 has attracted great attention with great stability and excellent photoelectric performance. Herein, a simple and environment-friendly two-step method was used to prepare...

Phase evolution and fluorescence stability of CsPb2Br5 microwires and its application to stable and sensitive photodetectors

Integrated micro-sized spherulites of ultrahigh molecular weight polyethylene (UHMWPE), with one clear homogeneous nucleation site and sheaf-like lamellae, have been successfully prepared from supercritical fluid of ethanol, supplying a propagating stage from sheaf-like dendrite to final spherical crystal.

Integrated polymer spherulites growing from one homogeneous nucleation site in supercritical fluid

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Coupling MoS2 nanosheets with CeO2 for efficient electrocatalytic hydrogen evolution at large current densities.

Process for preparing polymer ultra-fine particles by applying supercritical fluid

Phase evolution and fluorescence stability of CsPb2Br5 microwires and its application to stable and sensitive photodetectors

Integrated polymer spherulites growing from one homogeneous nucleation site in supercritical fluid