Papers by Keyword: High Temperature Resistance

Abstract: The ampholytic surfactant Lauramidopropyl betaine (LAB) is a multifunctional amphoteric surfactant, which is widely used in washing formulations and is the main component of many softeners and detergent formulations. It has the advantages of less irritation to skin, mild performance and easy biodegradability. It is superior to other amphoteric surfactants. In this paper, new surfactants were synthesized by using LAB as the main component and the molar ratios of LAB to formaldehyde were 1:1, 1:2, 1:3 and 1:4, respectively. The new functional group hydroxymethyl was introduced into the LAB, and the effect of hydroxymethyl on the properties of raw materials was discussed. And the surface properties were studied, including high temperature resistance, methanol resistance and salt resistance. The results showed that the high temperature resistance of R2 is better below 50 °C, R0 has better high temperature resistance above 50 °C; In the aspect of methanol resistance, the methanol resistance of R4 is better at 10% and 20% methanol content; The effect of R0 is better in salt resistance. Finally, it can be concluded that the introduction of methylol groups improves the performance of the prepared new surfactants in certain properties.

Abstract: In this paper, Polyborosilazane (PBSZ) was successfully synthesized and used as curing agents for epoxy resin. FTIR, TGA, XRD, SEM were used to analyze the curing mechanism, curing temperature and thermal stability of the curing system. The results indicated that PBSZ could be used as curing agents for bisphenol A epoxy resin when its usage amount was 30-60 wt.% at the temperature between 100 ∼ 150 °C. Additionally, the thermal stability of PBSZ cured epoxy resin samples were better than that of epoxy resin cured with 4, 4-diaminodiphenylsulfone (DDS), showing a higher residual weight at 900°C. As PBSZ content increased, the residual weight of PBSZ cured epoxy resin at 900°C increased. When PBSZ content was 30%, the surface of cured epoxy resins was smooth without obvious defects. However, the surface became coarse when PBSZ content was further increased.

Abstract: This paper investigates the influence of high temperature on geopolymer reinforced by straw fibers from 25°C to 800 °C with a duration of 0 min, 30 min and 60 min, respectively. The effect of straw fiber content on the thermal properties and compressive strength have also been explored. It is found that the optimum range of straw fiber came to be 2-4 % with both excellent thermal insulation properties and a comparable compressive strength. The mechanical strength of the geopolymer with 3% straw fiber subjected to elevated temperatures show that the geopolymer composites possess significantly higher strength and better temperature resistance than the conventional thermal insulation materials. When exposure to 300 °C for 60 min, the specimen gives a satisfied result of 42.08 MPa. And the compressive strength drop is almost under 50% after exposure to 400 °C for 60 min. Thermal analysis is employed to explore the temperature damage.

Abstract: A novel dendritic thickening agent has been prepared on account of the poor temperature resistance performance and other shortcomings of conventional polymer thickening agent (HPAM), and has evaluated its monomer proportioning and the performance of formed fracturing fluid. Accordingly, it has derived that, when the concentration of the polar monomer AMPS and the functional monomer GL is 30% and 1%, respectively, this novel dendritic thickening agent is able to maintain the excellent temperature resistance and shear resistance of the fracturing fluid system at lower concentrations. The optimal formula of the formed fracturing fluid is: 0.4% thickening agent +0.15% pH adjusting agent +0.25% crosslinking agent +0.1% discharge aiding agent. Under the conditions of 170s^-1 and 150°C, it has tested its temperature resistance and shear resistance properties, and the final viscosity after shearing for 2h was 147.6 mPa.s. The gel breaking liquid is characterized by low viscosity, low surface tension, low interfacial tension, little residue content, and is conductive to the smooth flowback of the gel breaking liquid after fracturing construction. Compared with the conventional guanidine gum fracturing fluid system, this novel dendritic thickening agent fracturing fluid system has much lower residue content.

Abstract: Fluid loss additive is the main component of the cementing fluid. This article use monomer the monomers of 2-acrylamido-2-methyl-propanesulphonic acid (AMPS) and N, N-dimethyl acrylamide (DMAA) by the method of aqueous solution polymerization to synthesis the novel fluid loss additive ANMG1305. Discuss the amount of initiator, the molar ratio of monomer, reaction temperature, which the influence on the properties of the polymer. Through the infrared spectrum, thermo-gravimetric analyzer, viscometer, such as instrument on its microstructure and properties were characterized. We know that all the monomers are involved in the reaction and the polymer has an excellent thermal stability though the microstructural characterization and application performance of the novel fluid loss additive.

Abstract: A new glass-ceramic coating material on nickel based super alloy substrate had been found, the glass¬-ceramic coating material was developed from a glass based on MgO–Al2O3–TiO2 system. The coating material was characterized through X-ray diffractometry (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), hardness, thermal expansion coefficient testing. XRD analysis of the coating materials and the resultant coatings showed presence of a number of microcrystalline phases. SEM micrographs indicated microstructure of the material. Optical micrographs showed smooth glossy impervious free surface with defects. Hardness analysis showed the glass-ceramic coating material had higher microhardness. The thermal expansion coefficient of the nimonic alloy was much higher compared to the coating material at specific temperature.

Abstract: According to the requirements of aluminum conductor composite cores, a kind of resin system was developed with TGDDM as main body, and self-made flexible epoxy SUC-1 as auxiliary, plus methyl hexahydrophthalic anhydride as curing agent. The gel rate of the system was high enough to meet the demands of pultrusion technique. The heat deformation temperature of cured sample reached 194°C, and the tensile strength achieved 62.95Mpa. The elongation at break matched that of carbon fibers. The interfacial bonding between the matrix and the fibers, observed by scanning electron microscope, was tight without debonding phenomenon.

Abstract: To simplify the operation for the oil and gas development for drill and complete the well in the petroleum industry, a natural vegetable gum drilling and completion fluids system is developed for the industrial control and application. As the system combines the advantage of the drilling fluid and completion fluid, it need not change the two different fluids during the operation, which is beneficial to the operation control. In addition, it can improve the implementation of the oil and gas exploration for industrial application. An extensive laboratory work for the high-temperature resistance capability of the natural vegetable gum drilling and completion fluids system is carried out, including the formulation study of the detailed system and the corresponding performance evaluation. In the system, with the basic formula of the natural vegetable gum drilling and completion fluids system, several new formulas beneficial to improve the high-temperature resistance capability of the system have been described. The corresponding laboratory analysis has demonstrated that the prosperities of the system, with the temperature resistance capability up to 305℉, are proper for the industrial application.

Abstract: In aerospace field and submarine field, structure vibration is ubiquity and the work environments is very bad which is oily and work temperature is high. Damping material is a kind of high molecular polymer which has elastic solid property and viscous fluid property at the same time and can attenuate bending vibration of structures and reduce radiated noise. So using damping material to control the structures vibration is an effective method. By experimentations and performance testing of 200 formulas, a new kind of excellent damping material has been successfully developed which is oil resistance and high temperature resistance. At the same time, the paper has established the formula database of damping materials which is a good base for many different engineering applications of damping material with oil resistance and high temperature resistance.

Abstract: A new kind of high temperature solid lubricant coating was synthesized by adopting new technique and using graphite, MoS2, Sb2O3 and Al2O3. Its tribological behaviors and lubricate mechanism were studied by means of wear testers. The experiment results show that the friction coefficient of the solid lubricant coating decreases with the increase of load and slightly increases with the raise of temperature. The solid lubricant coating still has good lubrication in 400 .