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Study on the Colloidal and Film Properties of Natural Rubber-Styrene Butadiene Rubber and Natural Rubber-Neoprene Rubber Latex Blends

Author: WangZuo
Tutor: TanHaiSheng；LiaoXiaoXue
School: Hainan University
Course: Materials Science
Keywords: natural rubber latex styrene butadiene rubber latex neoprene latex blend properties
CLC: TQ330.1
Type: Master's thesis
Year: 2011
Downloads: 143
Quote: 0
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Abstract


Because of integrated performances, natural rubber latex had a very wide range of applications, but mechanical properties such as anti-aging, heat and solvent resistances of latex products needed to be improved. Synthetic latex had a good special performance.Natural rubber latex and synthetic latex blends could overcome some of the weaknesseses, improve performances of latex products, expand latex industrial raw materials,lower production costs and make up for the lack of natural rubber latex. Rubber protective layer of material composition, content and saturation on rubber particle surface had a great impact on colloidal properties when different latex blended, the curing characteristics were different too.Therefore, latex blend was a complex issue.The article studyed on the colloidal and film properties of NRL/SBRL and NRL/CRL blends with natural rubber latex(NRL), styrene-butadiene rubber(SBRL), neoprene latex(CRL). Researched on the effect of the proportion、storage time、the type and amount of stabilizers on the viscosity of NRL/SBRL blends; Researched on the effect of the proportion、storage time on the viscosity of NRL/CRL blends; the effect of proportion on surface tension of natural latex and synthetic latex blends was invested.The effect of proportion, amount of sodium laurate and Zinc oxide, curing temperature on mechanical properties of NRL/SBRL sulfided film was discussed; the influence of proportion, amount of Zinc oxide, compatibilizer on mechanical properties of NRL/CRL sulfided film was studied. The heat and oil resistance of vulcanized film was studied. Researched on the difference of colloidal and film properties between NRL/SBRL and NRL/CRL vulcanized films.The experimental results showed that:the viscosity of NRL/SBRL and NRL/CRL blends had a substantial increase with the increasing amount of NRL, the viscosity change through the maximum with a ratio of 70/30 and then decreased, and when the proportion was less than 30/70, the viscosity curve of NRL/SBRL and NRL/CRL blends were similar, when the proportion was higher than 30/70, the increase viscosity curve of NRL/SBRL was greater than NRL/CRL blends,with the extension of storage time, the viscosity decreased; added anionic stabilizer in NRL/SBRL system can reduce thicken the initial latex,1% sodium dodecyl sulfate can effectively reduce the thickening of latex blends.The surface tension of latex blends increased when the amount of NRL increased,the change trend of NRL/SBRL blends about surface tension were bigger than NRL/CRL blends.When the proportion of natural rubber latex increased,the mechanical properties of NRL/CRL vulcanized films increased,the mechanical properties of NRL/SBRL vulcanized films were best with a ratio of 90/10 and then decreased. With the ratio of NRL/SBRL 90/10 for the study, mechanical properties of vulcanized film were best with 0.5% sodium laurate,3% zinc oxide,100℃vulcanization temperature. With the ratio of NRL/CRL 70/30 for the study, NRL/CRL vulcanized films had good mechanical properties with 3% zinc oxide and epoxy latex 25. The aging resistance, heat resistance, oil resistance of blends vulcanized films were improved when added styrene-butadiene rubber and neoprene latex to natural rubber latex Thermogravimetric analysis showed that when the ratios of NRL/SBRL, NRL/CRL were 90/10 and 70/30, latex blends compatibility were better.

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