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Company Overview

Company Overview. Established in 1959, Pidilite Industries has become a dominant player in consumer and specialty chemicals Pidilite is market leader in Construction chemicals, Art and craft materials Some of our biggest brand are. Pidilite Industries Ltd.

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Company Overview

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  1. Pidilite Industries Ltd Company Overview • Established in 1959, Pidilite Industries has become a dominant player in consumer and specialty chemicals • Pidilite is market leader in Construction chemicals, Art and craft materials • Some of our biggest brand are

  2. Pidilite Industries Ltd EFFECT OF DISPERSION PROCESS AND ANIONIC TO NON-IONIC RATIO ON PROPERTIES OF WATERBORNE POLYURETHANE DISPERSIONs 3

  3. CONTENTS • Process flow for PU dispersion • Experimental Design • Critical Phase dispersion Process and impact of anionic: non-ionic ratio on phase inversion time • Effect of ionic content and process variation on: • Dispersion Properties • Particle size and viscosity, Electrolytic stability , shear stability • Molecular weight , Drying, Loss and storage modulus • Polymer Film properties • Drying time, Gloss, water, alkali and solvent resistance • Hardness , Tensile strength Pidilite Industries Ltd Pidilite Industries Ltd

  4. Pidilite Industries Ltd Process Flow for PU dispersion Schematic representation from -DSM resin Gail Pollano

  5. Experimental Design Terminology in abstract used was direct process -W/O and Reverse process O/W 6

  6. Pidilite Industries Ltd Critical Steps-Phase W/O Process , • Phase inversion phenomenon begins when water extends into the hydrophobic areas and their mobility decreases due to the occurrence of hydrophobic associates in the polymer matrix • The polymer -water interfaces then restructure and finally disintegrate into spherical dispersion particles enclosed by a continuous aqueous phase. Ref. Technical seminar, Delhi Feb. 2009 by Dr Dirk Reichel, Evonik

  7. Pidilite Industries Ltd The Phase inversion phenomenon is observed only in W/O process. In O/W process this phenomenon was not prominent or not observed. Time required to invert the phase (W/O to O/W) decreased with increasing the non-ionic and increases with increasing anionic

  8. Pidilite Industries Ltd With increasing anionic content the particle size decreases and corresponding viscosity increases. At 1:1 concentration of non-ionic and ionic, PUD made with O/W process displayed finer particle size and lower viscosity

  9. Pidilite Industries Ltd Effect of Process and Anionic: Non-ionic content on Shear Stability, @5000RPM/20min In both the process composition having higher content of non-ionic shows maximum viscosity increase, hence least stable. Similar phenomenon observed in higher anionic content, however, the extent of viscosity pickup is low in case of W/O process.

  10. Pidilite Industries Ltd Molecular weight and polydispersity • No specific trend observed in Mol.Wt. w.r.t. increase in non-ionic • There is an increasing trend in Mol. Wt. with increasing the anionic content • PUD made with O/W process displayed higher Mol. Wt. and higher polydispersity

  11. Pidilite Industries Ltd * Higher the coagulum lesser is the stability • In all the cases electrolytic stability (especially in HCL) of the PUD made with O/W process are more stable than W/O process. • As expected the ionic stability increases with increase in non-ionic concentration and decrease with increasing anionic

  12. Pidilite Industries Ltd Drying Time, Gloss @60º, Viscoelastic Properties

  13. Pidilite Industries Ltd Water , alkali and solvent resistance of the polymer film Spot Test ASTM 1308 In both the process the water resistance of the polymer film decreases with increasing the concentration of anionic and non-ionic. The water resistance is highest in absence of non-ionic and lowest at higher non- ionic content. In O/W process after 1:1 ratio decreasing trend was observed in alkali and water resistance. In both the process the solvent resistance improved with increase in non-ionic content and decreases with increasing an-ionic Polymer film of PUD made by O/W process displayed marginally higher solvent resistance than W/O process

  14. Pidilite Industries Ltd Pendulum Hardness, Tensile strength and Elongation • Pendulum hardness of the polymer film decreases with increasing the non –ionic in both the process . However, the trend is more prominent in O/W process than W/O. • The hardness is found to be highest when the anionic concentration became double. Interestingly, PUD made with W/O process are more harder in all cases Irrespective of the process the Tensile and elongation are the highest in absence of non-ionic and lowest at 1:1 ratio of non-ionic and anionic. In W/O process elongation increases with non-ionic /anionic content In W/O process increase in elongation is more prominent with increase in ionic/non -ionic content

  15. Pidilite Industries Ltd SUMMARY • It was also observed that change in Anionic: Non-ionic ratio of the dispersion has significant impact on the mechanical properties such as hardness, elongation and tensile, as well as surface properties like drying time, gloss. • Solvent , water and alkali resistance are highly dependent on ionic content than process variation • In all the compositions the viscoelastic properties such as storage and loss modulus are independent of the process or Anionic: Non-ionic ratio and showed highly resilient properties. • There were no cross over in loss and storage modulus hence no distinct transition observed. This indicated highly amorphous nature of the polymer • It is possible to alter the properties and performance of the polyurethane dispersion using different dispersion process.

  16. Pidilite Industries Ltd Acknowledgement • The authors are grateful to • Pidilite Industries limited for their support. • Thanks to the Analytical team for valuable inputs, and Yashika for assisting in experimental work.

  17. Pidilite Industries Ltd • Thanks • For your attention

  18. Pidilite Industries Ltd References • Phase W/O in polyurethane prepolymer-water dispersions, Ph. D. Thesis by Saw, Lin K, Loughborough University, August 2000 • Barni, A.; Levi, M. J Appl Polym Sci 2003, 88, 716. • M. J. Ferna´ndez-Berridi et al. J. Appl Polym Sci, 2011, 120(4) • 4. ASTM D523-89(1999) Standard Test Method for Specular Gloss

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