Synthesis of Reactive Polyurethane Adhesives and Studying the Effect of Ketonic Resins

Abstract

In this study, the effects of cyclohexanone formaldehyde ketonic resin (CFR) with different montmorillonite content on the viscosity, initial adhesion strength and temperature resistance of polyurethane one component adhesives were investigated. Cyclohexanone formaldehyde resin (CFR) with varying montmorillonite (MM) content were incorporated into formulation with a specified weight ratio (rate of 10% by weight of polyether polyol.) One-shot technique was used for synthesis. Blank polyurethane was synthesized using polyether polyol and polymeric 4,4'-methylene diphenyl diisocyanate (p-MDI). In experimental studies, the ratio of the isocyanate groups (NCO) to the hydroxyl group (OH) was 4.84. Reaction completion was followed by FTIR   spectroscopy. Choloroparaffine was used as a plasticizer to adjust the viscosity and to reduce the fragile structure of the product. The NCO % values of the synthesized adhesive PU were measured by titration. When TGA datas were examined, it was found that the heat resistance of the product increased with the addition of CFR and MM-CFR. As a result, it has been determined that the adhesion properties and thermal resistance were improved with the use of ketonic resins in one component reactive adhesives.

Keywords

• Polyurethane,ketonic resin,cyclohexanone-formaldehyde resin,adhesive

References

1. 1. Saunders J, Frisch K. Polyurethanes: Chemistry and technology. Part 1. New York: Interscience Publishers; 1962.
2. 2. Meier-Westhues U. Polyurethanes: coatings, adhesives and sealants. Vincentz Network GmbH; 2007.
3. 3. Randall D, Lee S. The polyurethanes book. Everberg, Belgium: Huntsman Polyurethanes; 2002.
4. 4. da Silva ALD, Martín-Martínez JM, Bordado JCM. Influence of the free isocyanate content in the adhesive properties of reactive trifunctional polyether urethane quasi-prepolymers. International journal of adhesion and adhesives. 2006;26(5):355–62.
5. 5. Clauβ S, Dijkstra DJ, Gabriel J, Kläusler O, Matner M, Meckel W, et al. Influence of the chemical structure of PUR prepolymers on thermal stability. International journal of adhesion and adhesives. 2011;31(6):513–23.
6. 6. Frihart C. Wood adhesion and adhesives. New York: CRC Press; 2005.
7. 7. Crocombe A. A.Single lap joint geometry. In: Da Silva L, Öchsner A, editors. Modeling of adhesively bonded joints. Springer; 2008.
8. 8. Dunky M. Urea–formaldehyde (UF) adhesive resins for wood. International Journal of Adhesion and Adhesives. 1998;18(2):95–107.

9. 9. Pizzi A, Mittal K. Wood adhesives. CRC Press; 2011.
10. 10. Poljanšek I, Fabjan E, Moderc D, Kukanja D. The effect of free isocyanate content on properties of one component urethane adhesive. International Journal of Adhesion and Adhesives. 2014;51:87–94.
11. 11. Uyanik N, Yalçinkaya H, Kizilcan N. Poly (dimethyl siloxane)-containing five-block copolymers: effects of resin blocks. Surface Coatings International Part B: Coatings Transactions. 2001;84(4):309–16.
12. 12. Gruenewaelder B, Schoetmer B, Haller W, Ness B, Single-Component Polyurethane Adhesive United States Patent US 7,259,207 B2 Aug. 21, 2007
13. 13. Frangi A, Fontana M, Mischler A, Shear behavior of bond lines in glued laminated timber beams at high temperatures. Wood Sci Technol (2004) 38: 119–126
14. 14. Richter K, Pizzi A, Despres. Thermal stability of Structural One- Component Polyurethane Adhesives for Wood-Structure- Property Relationship. Journal of Applied Polymer Science. 2006;102:5698–5707
15. 15. Kızılcan N, Ustamehmetoğlu B. Chemical polymerization of pyrrole in the presence of ketone–formaldehyde resins. Journal of Applied Polymer Science. 2005;96(3):618–24.
16. 16. Uhl FM, Davuluri SP, Wong S-C, Webster DC. Polymer films possessing nanoreinforcements via organically modified layered silicate. Chemistry of materials. 2004;16(6):1135–42.
17. 17. Chaiko DJ, Leyva AA. Thermal transitions and barrier properties of olefinic nanocomposites. Chemistry of materials. 2005;17(1):13–9.
18. 18. Ionescu M. Chemistry and technology of polyols for polyurethanes. 2nd edition. Vol. 1. Shawbury, Shrewsbury, Shropshire, United Kingdom: Smithers Rapra; 2016.
19. 19. F. Merger, G. Schleier and D. Schlotterbeck, Germ. Offen. DE 3,624,924(1988).