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Further Applications of Reactive In-Mold Coating (IMC): Effect of Inhibitor and Carbon Nano-Particles

BHUYAN, MOHAMMAD SHAHAJAHAN KABIR
http://rave.ohiolink.edu/etdc/view?acc_num=osu1531178248132272

Abstract Details

2018, Doctor of Philosophy, Ohio State University, Industrial and Systems Engineering.
Environmentally friendly practices have led to a tendency of solvent reduction in finishing/painting applications. Traditional painting emits up to 380 gm/l volatile organic compounds (VOC) into the environment which makes work area hazardous and increases physiological and psychosocial risk factors. Lower emission during painting process is a requirement in any manufacturing industry. In-mold coating (IMC) being 100% solids upon polymerization (thus no VOC) is an environmentally friendly alternative to traditional painting/coating. In some applications such as in compression molded automotive and truck exterior body panels, IMC is already being used as an electrically conductive primer for subsequent electrostatic painting. To further increase the industrial acceptance of IMC, it is essential to continuously develop approaches to decrease the cycle time while maintaining adequate flow time and pot life so that molder gets enough time to fill the mold cavity before solidification. In this study, the effect of inhibitor (p-Benzoquinone) is evaluated as a way to improve the Pareto Frontier (PF), outlining the best compromises between cycle time and time available for flow. To do this a recursive Multi-criteria optimization (MCO) method is applied. At first glance, it would seem counterintuitive to use an inhibitor to decrease the cycle time because it delays the reaction process. However, increasing the inhibitor and the initiator allow us to run at higher molding temperatures and still have an adequate flow time. Increasing the inhibitor will also be beneficial to the pot life. Another benefit of IMC is to make the plastic part conductive for further electrostatic painting for higher paint transfer efficiency. In current IMC systems, Carbon black (CB) is used to provide the desired conductivity. Typically, 2.8% CB is required for electrostatic painting (10-10 to 10-5 S/cm) such an amount makes the coating black. If the conductivity of the particle used is high enough, there is the potential that the conductivity needed for making the coating conductive enough for further electrostatic painting application can be achieved at a level where the coating is clearer and as such can be colored by adding pigments, or require lower paint or top coat to achieve the desired final part color. In this work, extremely conductive filler, single wall carbon nanotube (SWCNT) is used instead of CB to develop a clearer version of IMC.
Jose Castro (Advisor)
227 p.
Industrial Engineering
In-Mold Coating, Differential Scanning Calorimetry, Multi-criteria optimization, Pareto frontier, Process Window

Recommended Citations

Citations

  • BHUYAN, M. S. K. (2018). Further Applications of Reactive In-Mold Coating (IMC): Effect of Inhibitor and Carbon Nano-Particles [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531178248132272

    APA Style (7th edition)

  • BHUYAN, MOHAMMAD SHAHAJAHAN KABIR. Further Applications of Reactive In-Mold Coating (IMC): Effect of Inhibitor and Carbon Nano-Particles. 2018. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1531178248132272.

    MLA Style (8th edition)

  • BHUYAN, MOHAMMAD SHAHAJAHAN KABIR. "Further Applications of Reactive In-Mold Coating (IMC): Effect of Inhibitor and Carbon Nano-Particles." Doctoral dissertation, Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531178248132272

    Chicago Manual of Style (17th edition)

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This open access ETD is published by The Ohio State University and OhioLINK.