Research of Liquid Paraffin-Emulsion
Paraffin emulsion was prepared from liquid paraffin by the means of adding coemulsifier. The effects of the emulsifie species and their dosages, water dosage, emulsifying temperature, and emulsifying time on the paraffin emulsion properties were studied. The results showed that composite emulsifiers could provide better performance for the paraffin emulsion. The influencing factors can be arranged in order:water dosage>emulsifier dosage>emulsifying temperature>emulsifying time. Stable paraffin emulsion can be prepared under the optimum conditions:m(glycerol monostearate)/m(Tween80)=3∶4, emulsifier dosage 0.9%,emulsifying temperature 85 ℃,emulsifying time 50 min,water dosage 62.0% and stirring speed 1 100 r/min. The experimental result indicated that the liquid paraffinemulsion had better stability density and dispersibility.
The Preparation of Epoxy Acrylate Pre-Polymers Modified by Isocyanate
The prepared epoxy acrylate was modified by toluene diisocyanate (TDI), affording the urethane modified acrylate pre-polymer with interpenetrating network structure. The effects of modifier dosage, reaction time, reaction temperature, catalyst type and amount on the conversion rate were studied. Infrared spectroscopy was used to characterize the structure of the modified product. In the mean time, the modified product ensile strength of the cured film and curing film elongation at break were analyzed. The highest conversion rate was obtained under the following condition: the amount of modifying agent (TDI) and epoxy acrylate mole ratio was 0.25∶1, reaction time 5 h, the reaction temperature was 75 ℃, the mass ratio of the composite catalyst(triethylamine and DBTD)was 1:1, added in an amount of 0.1%. IR spectra confirmed the formation of the modified pre-polymer.
Study on SBR-C9 Petroleum Resin-Modified Asphalt
he effects of styrene butadiene rubber (SBR) on softening point, penetration and ductility of C9 petroleum resin modified asphalt were studied. The mechanism for SBR- C9 petroleum resin-modified asphalt was also discussed. The results show that SBR can effectively improve the softening point of C9 petroleum resin-modified asphalt. When introducing 4.0% mass fraction of SBR, the performance of modified asphalt could meet the required standard of JTJ036-98. The four components (saturation, aromatic, resin and asphaltene) analytical results indicate that the aromatics content of the modified asphalt system can be increased after adding C9 petroleum, thus the swelling and adsorption of SBR in the C9 petroleum resin modified asphalt can be promoted. Electron microscopy result demonstrates that, when the SBR content is 5.0%, the C9 petroleum resin modified asphalt shows good compatibility, stability, and numerous crazes. A three pitch stable polymer network structure might be formed for the SBR, C9 petroleum resin, and asphalt system.
Preparation of C9 Petroleum Resin-Modified Asphalt