Effect of Kaolin on Adhesion Property of Epoxidized Natural Rubber-based Pressure-sensitive Adhesive Using Gum Rosin as the Tackifier

Abstract

The viscosity, loop tack, and peel strength of kaolin-filled epoxidized natural rubber (ENR 25 grade) adhesive was investigated using gum rosin as the tackifying resin. Kaolin loading was varied from 10—50 parts per hundred parts of rubber (phr), whereas the gum rosin concentration was fixed at 40 phr. Toluene was used as the solvent throughout the study. Polyethylene terephthalate substrate was coated at various adhesive coating thicknesses, i.e., 30, 60, 90, and 120 µm using a SHEEN hand coater. A HAAKE Rotary Viscometer Viscosity was used to measure the viscosity of the adhesive. Loop tack and peel strength were determined by a Llyod Adhesion Tester operating at 30 cm/min. Results show that viscosity of the adhesive increases gradually with increase of kaolin loading due to the concentration effect of the filler. Loop tack and peel strength, however, show maximum value at 20 phr and 30 phr kaolin, respectively, an observation which is attributed to the maximum wettability and compatibility of adhesive on the substrate.

Keywords

adhesion kaolin rubber adhesive.

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References

Kraus, G. and Rollmann, K.W. ( 1977). The Entanglement Plateau in the Dynamic Modulus of Rubbery Styrene-diene Block Copolymers. Significance to Pressure-sensitive Adhesive Formulations, J. Appl. Polym. J., 21: 3311-3318.

Kraus, G. and Hashimoto, T. ( 1982). Structural Changes in Melts of Butadiene-styrene and Isoprene-styrene Block Polymer-based Pressure-sensitive Adhesives, J. Appl. Polym. J., 27: 1745-1757.

Leong, Y.C. , Lee, L.M.S. and Gan, S.N. ( 2003). The Viscoelastic Properties of Natural Rubber Pressure-sensitive Adhesive using Acrylic Resin as a Tackifier, J. Appl. Polym. Sci., 88: 2118-2123.

Poh, B.T. and Chang, Y.Y. (2006). Viscosity and Peel Strength of SMR 10-based Pressure-sensitive Adhesives, Polym.-Plast. Technol. Eng., 45: 1251-1256.

Poh, B.T. and Chee, C.L. (2007). Effect of Coumarone-indene Resin on Adhesion Property of SMR 20-based Pressure-sensitive Adhesives, Int. J. Polym. Mater., 56: 247-255.

Poh, B.T. and Kwo, H.K. (2007). Shear Strength of SMR-based Pressure-sensitive Adhesives, Polym.-Plast. Technol. Eng. , 46: 1021-1024.

Poh, B.T. and Kwo, H.K. (2007). Peel and Shear Strength of Pressure-sensitive Adhesives Prepared from Epoxidized Natural Rubber, J. Appl. Polym. Sci., 105: 680-684.

Poh, B.T. and Chow, S.K. (2007). Effect of Zinc Oxide on the Viscosity, Tack and Peel Strength of ENR 25-based Pressure-sensitive Adhesives, J. Appl. Polym. Sci., 106: 333-337.

Gierenz, G. and Karmann, W. (eds) (2001). Adhesives and Adhesive Tapes , New York, Wiley-VCH, p. 103.

10.

Skeist, I. (ed.) (1990). Handbook of Adhesives, 3rd edn, New York , Van Nostrand Reinhold, pp. 169, 179.

11.

Satas, D. ed. 1982. Handbook of Pressure-Sensitive Adhesive Technology, New York, Van Nostrand Reinhold, p. 41.

12.

Davies, C.K.L. , Wolfe, S.V. , Gelling, I.R. and Thomas, A.G. (1983). Strain Crystallization in Random Copolymers Produced by Epoxidation of cis 1,4-polyisoprene, Polymer, 24: 107-113.

13.

Poh, B.T. and Khok, G.K. (2000). Tensile Property of Epoxidized Natural Rubber/Natural Rubber Blends, Polym.-Plast. Technol. Eng., 39: 151-161.