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Dai W.,Soochow University of China | Xu L.,Soochow University of China | Xie H.,Soochow University of China | Chen D.,Suzhou Younuo Plastic Industry Co.
Journal of Soochow University Engineering Science Edition | Year: 2012

In this paper, acrylate copolymer latexes containing fluorine and silicon were prepared via semi continuous emulsion copolymerization in the presence of dodecyl-benzenesulfonic acid (DBSA). The effects of the contents of catalyst and monomers on the stability of emulsion were systemically investigated. FTIR, TEM and TGA were used to analyze the properties of the latexes and films. The results indicated that when the amount of D 3 F was 20%, DBSA was 0.7%, VTES was 3%, the final product was much more stable. The average particle size of the latexes was about 88 nm with a narrow distribution. The thermal stability of the film was improved and the water absorption rate was declined by the addition of fluorosilicone monomer.

Qiang Z.,Suzhou University | Dai W.,Suzhou University | Xie H.,Suzhou University | Chen D.,Suzhou Younuo Plastic Industry Co.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2012

Isopropyl alcohol was used to modify KH-570, isopropoxy with larger steric hindrance was partially or fully introduced to it, this made the modified production have hydrolysis resistance. The silicone-acrylate emulsions of different silicone content were prepared using vinyl siloxanes and grafting siloxanes. The effects of silicone content on the process of emulsion polymerization and transparence, the mechanical properties of latex film were studied. The results show that the hydrolysis resistance of organsilicone is improved with the introduction of isopropoxy, little coagulation is left in the system; the latex film has excellent general performance when the silicone content reaches 21% of total monomers.

Dai C.,Suzhou University | Chen L.,Suzhou University | Xie H.,Suzhou University | Chen D.,Suzhou Younuo Plastic Industry Co.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2012

The silicone with aminoethyl and aminopropyl reacted with sodium chloroacetate in this paper and formed a new structure. Silver ion was added to the modified silicone emulsified latex to form a kind of antibacterial fabric softener. The solvents, reaction temperature and reaction time were studied in this paper. The solvent chose ethanol, catalyst chose tetramethylammonium hydroxide and dosage was 1% of silicone raw material, sodium chloroacetate was 1.6% of silicone, reaction temperature was 80°C and reaction time was eight to ten hours. The emulsifier, which was composed of fatty alcohol-polyoxyethylene ether and isomerism-alcohol-polyoxyethylene ether, was selected according to hydrophile and lipophilic balance (HLB) value. The results indicate that the fabric finished with the latex has a full, soft hand feel and excellent antimicrobial activity.

Luo Z.,Soochow University of China | Hong R.Y.,Soochow University of China | Hong R.Y.,Fuzhou University | Xie H.D.,Soochow University of China | And 2 more authors.
Powder Technology | Year: 2012

Functionally modified silica nanoparticles were synthesized by a one-step method, based on the hydrolysis of tetraethyl orthosilicate in aqueous alcohol solutions with the addition of 3-methacryloyloxypropyl trimethoxy silane. The effects of the surfactant, water and ammonia concentration, and reaction temperature on the morphology and particles' size of silica were studied. The particles' size and size distribution of silica were characterized using transmission electron microscopy, scanning electron microscopy and dynamic light scattering. Monodisperse, spherical, functional silica nanoparticles were obtained at the optimal conditions. Afterwards, silica nanoparticles were dispersed in polyurethane (PU) coatings via solution blending to reinforce PU. The thermal and mechanical properties of PU films were measured by thermogravimetric analysis and universal testing machine, respectively. The results showed that the thermal and mechanical properties of PU films were improved with the addition of the modified silica nanoparticles. © 2011.

Gu H.,Changshu Institute of Technology | Tang X.,Soochow University of China | Hong R.Y.,Soochow University of China | Hong R.Y.,Fuzhou University | And 4 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2013

Fe3O4 nanoparticles were prepared by co-precipitation and coated by sodium dodecyl benzene sulfonate (SDBS) to obtain water-based magnetic fluid. The viscosity of the magnetic fluid was measured using an Ubbelohde viscometer. The effects of magnetic particles volume fraction, surfactant mass fraction and temperature on the viscosity were studied. Experimental results showed that the magnetic fluid with low magnetic particle volume fraction behaved as a Newtonian fluid and the viscosity of the magnetic fluid increased with an increase of the suspended magnetic particles volume fraction. The experimental data was compared with the results of a theoretically derived equation. The viscosity of the magnetic fluid also increased with an increase in surfactant mass portion, while it decreased with increasing temperature. Moreover, the viscosity increased with increasing the magnetic field intensity. Increasing the temperature and the surfactant mass fraction weakened the influence of the magnetic field on the viscosity of the magnetic fluid. © 2013 Elsevier B.V.

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