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Format: MS WORD  |  Chapter: 1-5  |  Pages: 90  |  1079 Users found this project useful  |  Price NGN3,000





Car surfaces are vulnerable to scratches from environmental conditions, thereby prompting car users to visit car workshop for re-spray. This process does not usually bring permanent solution to scratches on car surfaces since they are often re-spray with non-self-healing paint. The aim of this work was to develop self-healing car paint. In doing this, response surface methodology (RSM) was used to obtain an optimum paint formulation which was then improved into a self-healing car paint by incorporating chitosan into the formulation, sprayed on substrates, allowed to dry, scratched with a pin, exposed with UV light from the sun and then investigated for self-healing using scanning electron microscope (SEM). The model developed for drying time and coverage responses using (ANOVA) in the RSM study were significant as their respective "Prob > F" values were less than 0.0500 with R2 values 0.8693 and 0.9204 respectively. The “lack of fit” in both cases were not significant which is desirable in statistical analysis of this nature. Physico-chemical analysis (viscosity, density and pH) were done on the 20-runs of formulated paint where runs 1, 3, 7, 8 and 13 had the best density values of 0.956 g/cm3, 0.977g/cm3, 0.875 g/cm3, 0.896 g/cm3 and 0.944 g/cm3respectively as compared to other runs. Runs 1, 3, 7, 8 and 13 viscosity values fall within range of “30±5 cp”,(ASTM, 2009; PAN, 2013) standard specification for car paint. The pH values of the twenty runs were in the range of 6.6 to 6.9. The physico-chemical test performance of runs 1, 3, 7, 8 and 13 was a criteria for their selection to undergophysico-mechanical test, in which run 8 among the other runs selected had the optimum performance in terms of gloss, film thickness, cross-scratch, punch, chemical resistance, heat resistance and colour stability tests as its results agreed closely to ASTM/PAN car paint standard specifications.The SEM analysis done on the coated substrates showed that chitosan has self-healing effect.




The surfaces of any object is vulnerable as it often makes continual contact with the corroding (or oxidizing) air, most especially when left in an open place, thereby bear the brunt of the sun, rain, fug, dew and snow (Rodger, 2008). Thus, under theseconditions, the surfaces tend to rust, disintegrate, corrode and crackresulting to wear of daily use. However, these effects can be prevented or managed with various surface coating medium such as wallpapers, plastic sheet, chrome, silver plating and paint which have being identified and applied to decorate and smooth out any surface roughness or irregularities (Jonathan, 2009). Paint is commonly used as compared to other surface coating due to its ease of application, maintenance and versatility (Jonathan, 2009).

Paint is defined as an engineered material made of several ingredients such as resin, solvent, pigments and additives that are mixed together to create a specific product with its own unique properties (Rodger, 2008). It is classified based on purposes and area of applications. A paint whose diluent of formulation and medium of cleanliness is solvent is refers to as „gloss paint. This type of paint can be formulated for car surface coating, refinery equipment coating, road marking purposes, varnishes and so on (Rodger, 2008; Alirezaet al., 2009). While a water base paint is term as an emulsion paint which can be applied for architectural building (Michael, 2005; Rodger, 2008). It can be formulated from four major components, be it solvent base or water base type(Michael, 2005). These components are resin (binder), pigments (sometimes in conjunction with extenders), solvent and additives (Rodger,2008).


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