Jin Sheng Liang

Polyurethane MicroPCMs Containing N-Octadecane Applied in Building Materials Synthesized by Interfacial Polycondensation: Thermal Stability and Heat Absorption Simulation

Polyurethane microcapsules containing phase change materials (microPCMs) of n-octadecane applied in building materials were successfully synthesized by an interfacial polymerization in aqueous styrene-maleic anhydride (SMA) dispersion with diethylene triamine (DETA) as a chain extender reacting with toluene-2, 4-diisocyanate (TDI). FTIR and SEM morphologies results confirmed that the shell of microcapsules was polyurethane. Thermal stability and heat absorption simulation were investigated by TGA, DSC and an environmental simulation apparatus. TGA data showed that the decomposition of the microcapsules began at approximately 339oC at 2oC/min of increasing temperature and 320oC under 20% humidity, respectively. Shell structure was affected by environmental changes including temperature and humidity. The microcapsules will be compact and service longer time in practical application under gentle environmental changes. Also, the thermal absorption characterization was performed on a self-made design to improve the understanding of the thermal properties of dried microcapsules in practical application.

Effects of Sepiolite Mineral Nano-Fiber on Strength and Toughness of Ceramics

The effects of sepiolite mineral nanofiber on strength and toughness of ceramics were investigated by bone china with addition of sepiolite mineral nanofiber. The flexural strength and fracture toughness were tested by three point bending method and single edge notched beam (SENB) method, and the microstructure of the ceramics was studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and optical microscopy. The results indicated that the structure pattern of sepiolite mineral nanofiber became much shorter and thicker after calcinations. Proper addition of sepiolite mineral nanofiber would increase the strength and toughness of bone china. The sepiolite mineral nanofiber can yield the bone china with fracture toughness and flexural strength values as high as 5.65 MPa·m1/2 and 112.66 MPa to 5.87 MPa·m1/2 and 118.90 MPa, mainly due to crack bridging, crack deflection and pullout by sepiolite mineral nanofiber.

Thermal Insulation Coatings Containing Sepiolite Mineral Fibers and their Performance

In this text, the effective thermal conductivity of different shape filler particles was investigated. The thermal insulation coatings were prepared using hollow glass beads and sepiolite as thermal insulation fillers and the thermal insulation effect was evaluated. The results show that the optimum ratio of sepiolite and hollow glass beads is 6:1, and the temperature difference of upper box and lower box is up to 18 °C. The main reason for this phenomenon is that the thermal conduction chain is difficult to form in the direction of heat flow, thus leading to the increase of thermal resistance and decrease of thermal conductivity.

Preparation and Properties of Thermal Insulation Latex Paint for Exterior Wall Based on Defibred Sepiolite and Hollow Glass Microspheres

Thermal insulating latex paint for exterior wall was prepared by water as dispersing media, polyacrylic emulsion as basic material, defibered sepiolite and hollow glass microspheres as main functional additives. The thermal insulation effect and mechanism were studied by thermal insulation effect testing device and visible light reflectance tester. The results show that the optimum contents of functional additives are as follows: 8% defibred sepiolite fibers, 6% hollow glass microspheres. The coating could arrest heat transmission and reflect visible light effectively.

Research Progress on Resource Utilization of Iron Tailings and its Development Trend in China

The treatment of iron tailings has been a global issue, which has bought serious impact on the environment, it was considered to be a potential threat to human lives. In the present paper, the development situation of iron tailings utilization in China is investigated, the problems existed is analyzed and suggestions are provided, which are hoped to be valuable in the future research and the development of functional materials and products. Keywords: Iron tailings, resource utilization, functional materials, environment protection

Preparation and Characterization of Sepiolite Nanofibers by Microwave Chemical Methods

The sepiolite samples were defibered by using microwave chemical technique, and then different sepiolite samples were obtained with different treatment process. The effect of reaction time on the defibering for sepiolite fiber bundles was studied systematically. Through characterization by scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscope (FTIR), it was found that the defibered sepiolite samples had an average diameter of about 100 nm and length greater than 20μm. The defibering effect of sepiolite samples as prepared reached optimum at the reaction time of 13 min, and the structural stability of sepiolite was kept after defibering treatment.

Effect of Surface Active Agent on Defibering for Sepiolite Fiber Bundles

The cationic surfactant-octadecyl trimethyl ammonium chloride was added to the mixture of sepiolite powders and water with mechanical stirring. The effect of cationic surfactant on the defibering of fiber bundles was studied. The samples were characterized by X-Ray diffraction (XRD), bulk density, scanning electron microscope (SEM), FT-IR spectrum (FTIR) and thermal conductivity. The results indicated that the surface active agent could protect the structure of sepiolite fibers effectively, the bulk density and the thermal conductivity of the fibers could reach 0.06g/cm3 and 0.042W/(m.K), respectively.

Effect of mineral composite materials with far infrared radiation on diesel oil combustion

The powders of mineral materials with far infrared radiation (CTTP) were prepared using rare earth cerium nitrate, tourmaline and transition metal oxide by coprecipitation, and calcination at 1073K for 3h. The inorganic-organic mineral composite materials with far infrared radiation (CTTR) were prepared from CTTP and resin according to the weight ratio of 4:6. It was found by characterization with scanning electron microscope (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscope (FTIR), that the infrared radiance of the CTTR was 93%. The effects of the CTTR on the surface tension and the kinematic viscosity of diesel oil as well as the effects of the CTTR on oil consumption and air pollutant emissions of oil-burning boiler were investigated in this paper. The results showed that the diesel oil dealted with the CTTR resulted in the strengthenty of molecular movement and the decrease of intermolecular contacts. In laboratory, the surface tension of diesel oil was reduced from 27.287 to 27.254 mN/m and the kinematic viscosity of diesel oil was reduced from 2.85 to 2.81 mm2s-1. The oil-saving rate of the RBS•VH-1.5 boiler treated with the CTTR could reach 4.57%, and the reducing rates of CO and NO in the exhaust gas were 1.30 and 4.08%, respectively.

Zeta Potential of Sepiolite in Aqueous System

Zeta potential of purified sepiolite in aqueous system was studied as a function of pH and solid content. From the experimental results, it was found that sepiolite surface acquired a negative charge in water at natural pH, and the value of zeta potential decreased with the increase of pH value. Solid content had effect on zeta potential, but it can be minimized by the increase of time.

Researches and Development of Activated Water and its Effects on Biological Growth

Activated water is beneficial to healthcare due to its changes of physicochemical properties compared to ordinary water. Some related researches on activated water are reviewed in this paper. Take magnetized water, mineral and ceramic activated water and electrolyzed water for examples, activating materials and technologies are briefly introduced. Then, mechanism of activation devices and activated water are summarized and discussed. Finally, mechanism of activated water on biological growth is analyzed by comparing their different properties.