Papers by Keyword: Water-Based

Abstract: A preparation of a kind of green water-based metal cleaning agent has been described in this paper. The reaction is using oleic acid and triethanolamine, by add the corresponding surface active agent. After a series of performance test, all kinds of metal has good corrosion resistance and cleaning effect, and no pollution to the environment.

Abstract: Printed electronic industry develops fast and has great potential. In order to prepare water-based nano-silver gravure conductive ink used for printed electronics, liquid chemical reduction method is used. Ag⁺ (5.89M) at high concentration acting as the precursor is reduced by hydrazine hydrate with PVP as the protecting agent. For one time of reaction, silver content of 9.25% is obtained. After washing and centrifuging the silver colloids for three times to purity, some amount of deionized water, resin and additives are added to the silver paste to fabricated water-based nano-silver conductive ink for gravure. Then, samples obtained by coating or proofing are dried and surface resistance and adhesion are measured. The results indicated that the silver particles prepared have size of about 50~100nm and most of the particles are spherical with small amount nanoplates. The nano-silver gravure conductive ink has 52.63% silver content and 3.58% PVP. Surface resistance of samples coated after sintering at 120°C for 30s can reach 129.5mΩ/sq and the resistivity is 1.49×10^-4Ω.cm. The ink layer surface has no drop after 3M method which indicating good adhesion. The ink is suitable for gravure and can be used in printed electronics.

Abstract: An high-performance water-based drilling fluid is a hot subject of research both at home and abroad in recent years. In this paper, the inhibition property and the influence of amino polyols AP-1 and aluminum polymer DLP-1 on drilling fluid properties were evaluated, on this basis, through the formula optimization, the high-performance water based drilling fluid was developed and and field applied. Both laboratory study and field application showed that aluminum polymer can reduce viscosity and filtration rate, and can effectively inhibit the hydration expansion of clay. Amino polyols had a little effect on the viscosity, gel strength and filtration of drilling fluid, but it had a good shale inhibition. This drilling fluid has good properties in rheology, filtration, inhibition and anti-contamination, with a satisfactory overall performance, which is helpful in solving wellbore instability that are due to unenven hydration or well developed micro fractures.

Abstract: Water-based anionic polycarbodiimide crosslinker which the storage stability is more than 6 months was synthesized by isophorone diisocyanate(IPDI), sodium hydroxyethyl sulfonate(SHES), 3-methyl-1-phenyl-2-phosopholene-1-oxide(MPPO). Polycarbodiimide crosslinker was characterized by Fourier transform infrared spectroscopy (FTIR) and was applied to aqueous polyurethane resin coating agents which containing carboxyl groups. The mechanical properties, the swelling ratio of the film in water, 0.05mol/L Sodium hydroxyl and butyl acetate and the dry and wet rub and abrasion resistance were tested. The infrared spectrogram shows the characteristic peak of -N=C=N- appeared at 2200～2100cm-1 and the characteristic peak of -SO3-appeared at 1105cm-1.The results of application indicated that: WAPC was applied to polyurethane resin, tensile strength of the film increased from 1.485MPa to 3.752 MPa. The swelling rate in water，0.05mol/L Sodium hydroxyl，butyl acetate decreased from 444.9% to 126.1%，181.9% to 92.5%，351.2% to 186.4% respectively; WPAC was added to top coating of coating agent, it was founded that the dry and wet rub resistance were both increased.

Abstract: The water based acrylic pressure sensitive adhesive was synthesized by seeded pre-emulsion polymerization, the influence of the amount of seeded pre-emulsion, and tri-functional aziridine crosslinker on the properties of the adhesive were studied. It was found that with the increase of the amount of seeded pre-emulsion, latex particle size decreases, contrasted with the increase of the viscosity, surface tension and contact angle of the emulsion; The aging performance of the adhesive can be significantly improved with the increase of the content of the crosslinker; compared with high temperature, high humidity has a more worse negative effect on the aging performance of the adhesive.

Abstract: A new water-based strippable protected coating was made by polyurethane emulsion and nano-CaCO₃ was put in the coating as the fillers. The influence of nano-CaCO₃ on the coating was discussed and the influence of film thickness on the coating was studied. The performance of the coating was tested, and when the dosage of nano-CaCO₃ was 2% and the film thickness was 0.13~0.14mm, the film had the best strippable ability. Its average mechanics intensity was 5.72MPa and average elongation at break was 258.35%.

Abstract: The nanoparticles of Fe3O4 were prepared with chemical precipitation method, and then used sodium oleate and the lauryl sulfonic aid sodium as bilayer to envelope the ultra-fine Fe3O4 particles. Then stabilized water base magnetic fluid was obtained. The crystallization behavior and the surface of Fe3O4 nanoparticles after the modification were investigated with XRD and IR respectively; the particle size was studied with TEM; the magnetic properties were studied with VSM. The mechanism of bilayer surfactants that modified Fe3O4 magnetic nanoparticles was explained, and influencing factors of the magnetic fluid were discussed.

Abstract: Stable water-based Fe3O4 ferrofluid was obtained by three steps. Fe3O4 nanoparticles with the size of about 10 nm were first prepared by chemical co-deposition method. In order to prevent Fe3O4 nanoparticles from agglomerating, they were coated by bilayer surfactants. Then, the coated Fe3O4 nanoparticles were dispersed well into water. Due to the actions of electrostatic force and hydrogen bond, the water-based Fe3O4 ferrofluids can keep stable for two years and no layered phenomenon occurred. The ferrofluid has high saturation magnetization, low remnant magnetization and coercive force.