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Preparation of montmorillonite modif ied phenolic resin for shell process

China Foundry 2009年第2期6卷 119-123页

作者： Xiong Jianmin Li Yuancai Wang Wenqing Xia Chun School of Material Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China School of Material Science and Engineering Nanchang Institute of Aeronautical Technology Nanchang 330063 P. R. China

The development of montmorillonite modified phenolic resin under microwave irradiation heating was *** effect of montmorillonite content and stirring time on the structure and morphology of synthetic resin was *** optimum processing procedure was found to be 45 min stirring time with 5.4% montmorillonite ***,the platelet spacing increases with stirring time till montmorillonite exfoliated to nanoscales *** montmorillonite is exfoliated,layered structure at nanoscale can be uniformly distributed in the *** overall performance of montmorillonite modi fied phenolic resin is improved remarkably,such as flow ability,tensile strength and toughness property of resin coated ***,the gelation speed decreased slightly by adding montmorillonite.

关键词： shell process phenolic resin montmorillonite comprehensive performance tensile strength

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Study on preparation of fast curing novolaks for the shell process

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China Foundry 2004年第2期1卷 106-111页

作者： Rongqi LI Yuancai LI Haoran ZHANG Wenqing WANG Xinji WANG Material Science and Engineering College Huazhong University of Science and TechnologyWuhan 430074 HubeiP.R.China Huawang Chemicals Co.Ltd. Shiyan 442000HubeiP.R.China

To save energy and raise molding and coremaking productivity, the synthetic procedure of novolaks for the shell process was investigated. The study indicated that it was difficult to obtain fast curing novolaks under strongly acidic conditions alone. A novel synthetic procedure was proposed for preparing novolaks in a two-step manner, a divalent metal salt catalyzed novolak preparation followed by a strong acid catalyzed novolak preparation. The optimum conditions for the two-step procedure were determined by orthogonal experiment design. The results showed that it was easy to prepare fast curing novolaks with cure time in the range of 20 s to 30 s and softening point in the range of 80℃ to 90℃ under complex catalysis conditions.

关键词： shell process fast curing novolaks complex catalysis orthogonal design

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