Papers by Keyword: Additive

Abstract: Magnetic cards are widely used as credit cards, gift cards and VIP cards. In many industries, the principal method for producing the magnetic stripe still employs magnetic tapes. Therefore, if magnetic inks could be printed directly on the poly (vinyl chloride) (PVC) cards, then there would be the potential to improve industrial efficiency significantly. In order to apply the magnetic inks to the credit cards or other PVC cards, the Screen printing technique was chosen as a suitable printing method.In formulation 19, it is easy to mix and disperse the iron oxide powders in binder, few agglomerates and agglomerates occurred in the dispersion and also the film thickness of this formulation is around 20 microns which is ideal for the magnetic stripe.

Abstract: In the present study, novel pyrocarbon samples were prepared by carbonization with phenolic resin as precursor and such as graphite nanosheets, carbon black, and TiO₂ with various ratios as additives. The microstructure, morphology, mechanical and anti-oxidation properties were investigated by X-ray diffraction, scanning electronic microscopy, electron universal testing machine, and oxidation weight loss method, respectively. The results show that the graphite nanosheets and carbon black can help to improve the mechanical properties and oxidation resistance of resin-based pyrocarbon because the structure of resin-based carbon will be effectively enhanced by these additives. TiO₂ will be restored in the coking process which led to destroy of the internal structure of pyrocarbon, thus the addition of TiO₂ will reduce the compressive strength and oxidation resistance of pyrocarbon. Mechanical property analysis indicate that the sample add graphite micro chip has the highest compressive strength of resin carbon, Numerical value for the sample is 17.3MPa, is 19 times of the sample which added graphite and boric acid, and 2 times of the sample which added TiO₂,graphite and boric. Oxidation experiment under 500 °C results show that add boric acid against oxidation resistance of resin carbon materials, without boric acid resin carbon the burning loss rate is only 40% of the sample. Oxidation experiment under 500 °C results show that added boric acid, TiO₂ and graphite sample of ignition loss rate is the lowest, the value of 71%, 25% lower compared to other samples.

Abstract: The influences on the performance of wet flue gas desulfurization system in mercury removing after adding mercury removal additive were studied. As a consequence, the mercury removal efficiency can be improved by this kind of additive, that the efficiency of elemental mercury and total mercury is raised along with the amount of additive is increased. And so can the desulfuration efficiency. The oxidation of calcium sulfite in desulfurization is promoted by the mercury removal additive, increase the reduce speed of calcium sulfite concentration.

Abstract: Non-Newtonian fluid is a kind of fluid that its shear stress is not always keeps a linear relationship with the shear strain rate. An overview of its applications was made here. Based on the special rheological properties, non-Newtonian fluids are divided into different types and used as additives, mediums and protective materials in many fields. The paper focuses on its applications in fluid rheological properties improving, damping devices, individual protection equipments and mechanical processing. The main achievements in application of the non-Newtonian fluid were introduced and a further prospect was also summarized.

Abstract: A new compound was successfully synthesized as an additive in electrolyte used for high-voltage lithium-ion batteries, owing to its unique structure with the sulfone group that can increase conductivity and broaden the electrochemical window of existing electrolyte. Its lowest unoccupied molecular orbital (LUMO) is-2.686 eV, respectively. The lower LUMO value results in formation of solid electrolyte interface (SEI) film on anode surface which is prior to other solvents and can impede the electrolyte composition. Through the electrochemical test, the electrolyte having this additive (0.2 wt%) showed wider voltage window, enduring the potential up to 5.5V higher than that of 4.8V performed by available commercial high-voltage electrolytes. The additive to electrolyte was effective not only for Li/Li₃V₂(PO₄)₃ cell but also for Li/LiMn₂O₄ cells with a cut-off range of 3.0-4.8 V.

Abstract: In this paper, the hydration process and strength of calcium acrylate (CA) modified cement under the effects of different additives, such as, initiator-hydrogen peroxide, accelerator-triethanolamine, and cross-linking agent-butyl acrylate, were studied. Through comprehensive analysis, the optimal content of additives of initiator, cross-linking agent, and accelerator is ascertained 3%, 10% and 3%, respectively. On the condition of optimal content of additives and CA, it can be obtained that CA can increase the exothermic rate of cement within one hour and accelerate the exothermic rate in the induction period, shorten the time of the induction period, and speed up the initial setting time of cement. Besides, CA can inhibit the transformation of AFm from AFt, improve the dispersion of cement paste, make later hydration more fully, and promote later strength.

Abstract: Acoustic microscopes can be used to measure Rayleigh and longitudinal wave velocities in a specimen at microscopic resolution. These velocities are deduced from the analysis of the so-called acoustic signatures or V(z) curves. Such curves are obtained by recording the output signal, V, as the specimen is defocused along the z axis of the lens. In this context, we investigate Co-Additives effects on reflectance functions, R(θ) and acoustic signatures. The elastic properties of Lithium cobalt mixed ferrites of different compositions from the experimentally and simulation observed that the values of longitudinal wave velocities vary from 5072 m/s to 6833 m/s whereas transverse velocities from 3084 m/s to 4105 m/s. The variation of the elastic moduli with composition was interpreted in terms of the binding forces between the atoms.

Abstract: At present, high temperature oil wells are known as the most problematic for cementing operation due to limitations of polymer. The polymers are significantly used as mutlifunctional additives for improving the properties of cement slurry. At high temperature, viscosity of polymer decreases and unable to obtained desired properties of cement slurry. It becomes then major cause of fluid loss and gas migration during cementing operations. Thus, it necessitates for polymers that can able to enhance viscosity of slurry at elevated temperatures. This paper is aiming to study Hydroxypropylmethylcellulose (HPMC) polymer at high temperature that is able to increase the viscosity at elevated temperature. In response, experiments were conducted to characterize rheological properties of HPMC at different temperatures (30 to 100 °C). Then it was incorporated as multifunctional additive in cement slurry for determining API properties (fluid loss, free water, thickening time and compressive strength). It was observed that HPMC polymer has remarkable rheological properties that can have higher viscosity with respect to high temperatures. The best concentration of HPMC was found from 0.30 to 0.50 gallon per sack. This concentration showed minimal fluid loss, zero free water, high compressive strength and wide range of thickening time in cement slurry. The results signified that HPMC polymer is becoming multifunctional additive in cement slurry to improve the API properties of cement slurry and unlock high temperature oil wells for cementing operations.

Abstract: Based on the removal of SO₂ as the research background, this paper focuses on the research of mono-component experiment and orthogonal experiment of compound sulfur-fixing agent composed of shell powder and red mud (at the mass ratio of 8:2) at the temperature of 1000°C and Ca/S was 2.0, by adding manganese dioxide, fly ash, magnesium oxide and potassium carbonate as the sulfur-fixing additive. The experimental results showed that the sulfur fixation capacity of desulfurizer is increased to different extents and the optimal ratio to additive is obtained after addition of the additive.

Abstract: Cement deep mixing method is a normal ground treatment method. However, it is less applied on the soft clay ground improvement. The test was carried out to the strength of cement mixing soft clay. The soft clay was mixed with cement to become cement mixing soil. The strength of cement mixing soil was analyzed at different maintenance ages. As the results, the strength was lower than the anticipation value. After mixing additive, the strength of cement mixing soil increased, but it still wasnt reached the design strength demand. So, the cement deep mixing method is careful to be as a ground treatment method for the project with thick soft clay ground and high design strength.