Rheology behaviour of modified silicone-dammar as a natural resin coating

Modified silicone-dammar (SD) was prepared by various weight percent from 5 – 45 wt% of dammar added. The n-value (viscosity index) of silicone with 5 and 10 % were turn to be 1.6 and 1.3 of viscosity index. While 15, 20, 25 and 30 wt% of dammar added gave 0.7, 0.3, 0.2 and 0.1 of viscosity index. O...

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Bibliographic Details
Format: Conference Proceeding
Language:English
Subjects:
Protective coatings
Pseudoplasticity
Regression analysis
Regression models
Rheological properties
Rheology
Shear rate
Shear stress
Silicone resins
Viscoelasticity
Viscosity
Weight
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Summary:Modified silicone-dammar (SD) was prepared by various weight percent from 5 – 45 wt% of dammar added. The n-value (viscosity index) of silicone with 5 and 10 % were turn to be 1.6 and 1.3 of viscosity index. While 15, 20, 25 and 30 wt% of dammar added gave 0.7, 0.3, 0.2 and 0.1 of viscosity index. On the other hand, 35, 40 and 45 wt% of dammar gave a fixed value of viscosity index of 0.03. This n-value shows the dispersion quality of paint mixture indicates that the modified silicone-dammar was followed the Bingham’s Model. The rheology measurement of SD mixture was analysed by plotting ln shear stress vs shear rate value. Analysis of the graph showed a Bingham plastic model with regression R2 equivalent to 0.99. The linear viscoelastic behaviour of SD samples increased in parallel with increasing dammar content indicate that the suspension of dammar in silicone resin could flow steadily with time giving a pseudoplastic behaviour.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4928839