Typical PSA dispersion can be much improved in adhesive performance by adding tackifier dispersions. Especially the tack and peel on low surface energy sustrates like untreated PE and PP is affected positively, while cohesion is still sufficient for the application. When developing tackifier dispersions we need to walk a fine line between creating a stable final adhesive dispersion and not affecting the tackifier action negatively. In the current presentation we will show the nature and the action of the tackifier, the surfactant, and the influence of surfactant packages to come to a stable, fast running PSA dispersion which has excellent adhesive performance.
Text of Tackifier Dispersions
1. Tackifier Dispersions Creating Stable, Fast Running Waterborne Adhesives Evert SmitRonnie ZeemanWouter van der Meulen 34. MKVS October 19-21 20091
2. Content Introduction Arizona Chemical Sustainable, Green and low Carbon Footprint Rosin Ester Tackifiers Their action looking at molecular scale Chemistries Rosin Ester Dispersions How are they made? Stable adhesive dispersions with tackifiers Testing at high shear Performance Conclusions 2 3. At Arizona Chemical we believe the key to success is through understanding ourcustomers businesses, working in close partnerships for mutual benefit. 3 4. Our company 10 Manufacturing facilities Broad-based research and development Regional headquarters in Jacksonville, Florida and Almere, Netherlands 2 Research, Development & Technical Service labs Almere, The Netherlands Savannah, Georgia US4 5. Our locationsOuluSandarneSt. Petersburg Chester le StreetAlmere Dover GersthofenPensacolaSavannah Niort Valdosta Panama CityJacksonville Miami Singapore 10 production sites, 5 sales offices US Headquarters in Jacksonville, Florida European headquarters in Almere, The Netherlands Sales officesProduction sites5 6. Our raw material: Renewable resources from the forest 6 7. Sustainability Biorefining- A New Word for our Decades of Experience! Biorefinery:A facility that integrates biomass conversion processes and equipment toproduce fuels, power and added-value chemicals from biomassSource: WikipediaRenewable rawCo-product of pulp Refining andProviding sophisticated productsmaterial productionproducing chemicals for the global chemical industry ArizonaPULP MILL Chemical 7 8. Arizona Chemical creates value from the tree TOFACTO Pulp DTO RosinPitch CTOKraft Process CST -Pinene -PineneCST-3-Carene 8 9. Arizona Chemical- Biorefining in its Truest Sense By producing multiple products, a biorefinery takes advantage of the variouscomponents in biomass and their intermediates therefore maximising the valuederived from the biomass feedstock.Source: Wikipedia9 10. The CTO and CST derivatives produced by Arizona Chemical in Oulu and Sandarne have a lower carbon footprint compared to substitutes 10 11. Refinery Products: Value from the treeSylvalite RE 100Comparable C5-C9 Resin 11 12. Sustainable pine chemicals for daily life 12 13. Green in Three WaysTRUE BIOREFINERIES TRUE BIOREFINERIESExtracting the most value from Extracting the most value fromthe biomass the biomassLOW CARBON FOOTPRINTLOW CARBON FOOTPRINT CUSTOMERS GREEN ADVANTAGE CUSTOMERS GREEN ADVANTAGE Nordic refineries withNordic refineries withAdditional environmental benefits asAdditional environmental benefits as demonstrated low footprintdemonstrated low footprintan enhancement to the biorenewablean enhancement to the biorenewable compared with similar operationscompared with similar operationscontentcontent 13 14. Creating a sustainable future with pine chemicals 14 15. Tackifier Dispersions For Pressure Sensitive Adhesive Dispersions 15 16. Rosin Ester Dispersions Upgrade adhesive performance for dispersions Need for high solids content Easy in use Ever faster running coaters Green APEO free and renewable resource16 17. Why would an adhesive stick? What is the gain for the molecules? Basic thermodynamics: Free Energy G = H - T S17 18. Basic thermodynamics G = H - T S Free energy: gain if negativeEntropy: value order = loss(negative),Enthalpy: thus badinteraction = gain with polymer (negative value)chains 18 19. Adhering to low surface energy substrates No possibilities for specific interactions only Van der Waals The surface of PE is liquid-like and bonding to a liquid surface Very little inter-chain interaction(just Van der Waals) TopSmall difference in free energybulk and top-layerBulkVery mobile chains (Tg: -90 C!)Resulting in liquid floating top19 20. Tackifiers work by bridging the topWork almost like a surfactant Bonding two phases Adhesive polymer Tackifier molecules Small Molecules have little issue with Topentropy! Bulk G = H - T S20 21. Tackifying resins based on rosin Bonding The molecule has 2 distinct areasCH3 Lipophilicenabling embedding in apolar areasCH3CH3 Polarfor interaction with theadhesive polymerHO2 C21 22. Tackifying resins: Rosin derivatives Chemistry The 2 functional groups also allow versatile modificationsCH3 Esterification DisproportionationCH3CH3 Hydrogenation Polymerisationor dimerisation Fortification HO2 C 22 23. Esterification Rosin estersNumber of rosin molecules 2 34 CH3 H3CCH3 CO OC H2 COO H2CCH2 OOCO COOCHC COOH2C CH2 OOC H3C H2 H2 CH2 C OCCH3 CCC O OH2 H2OOC O H3CCH3Diethylene Glycol Ester H3CDi-esterGlycerol Ester Tri-ester Tetra-ester Rosin Pentaerythritol Ester liquid 85C 100CSoftening point,C23 24. Rosin ester dispersionsDispersion of a rosin ester in water with surfactant(s) and possibly other additives. CO OC H2 CO O C H C H2 O O CG lycerol Ester24 25. Dispersing rosin esters In a dispersion the rosin ester is considered to be the oil phaseHow does a rosin ester disperse in water? 25 26. Catastrophic InversionAdding water and surfactant to molten rosin ester 26 27. In real lifeCatastrophic Inversion 27 28. Adhesive dispersion Typically acrylate polymer dispersion Optimised for fast trouble free running Add 20 40 % rosin ester dispersion To improve tack and peel BUT: Polymer resin mixture can become sub-optimal for high speed running if not carefully designed re surfactant package Final dispersion mixture needs to be stable at high shear stresses28 29. Shear stability in high speed coating Suspect AdhesiveGood Adhesive25,000 sec-1 with a 20 micron gap - Suspect would run OK on Gravure or Curtain, but not on Slot-Die - Good adhesive runs well on all three29 30. Optimised surfactant packages Make the total adhesive tackifier dispersion mixture stable even at high loading, at the high shear stresses seen at high coating speeds Prevent sedimentation30 31. Effect of surfactant package Old formulationNew formulation low viscNew formulation high viscMarket sampleShear Rate = 25,000 s-1, Gap = 10 microns running time 31 32. Adhesive performance Surfactant undoubtedly has impact on adhesive performance It counteracts the surfactant action of the resin Hence negative for both peel and shear Lower surfactant level should be better need careful balance for optimal stability but this can be done! 32 33. Comparison performance14Optimised12surfactantpackage10system 86420Tackified system Tack PE Neat system Tack SteelPeel PEPeel Steel Shear 33 34. Examples commercial grades Aquatac XR4316 Aquatac XR4324 General purpose high solids Coater-ready when added productto adhesive polymer Designed for use on curtain Designed for use on curtain / coatersgravure / slot die coaters High mechanical stability Unique wetting package Low viscosityincluded High mechanical stability low viscosity Good adhesion / cohesion Good adhesion / cohesion properties with several polymers properties with severalpolymers APEO free APEO freeCopyright Arizona ChemicalConfidential34 35. Rosin Ester Dispersions Upgrade adhesive performance fordispersionsNeed for high solids contentEasy in useEver faster running coatersGreen APEO free and renewable resource 35 36. Conclusions It is possible to design optimal surfactant packages Combining excellent high shear stability Without impeding adhesive performance Rosin ester dispersion upgrade adhesive performance drastically Ideally, each polymer resin combination needs to be studied individually:Lets work together36 37. Contact DetailsDr Evert Smit Technical Leader ResinsArizona Chemical Transistorstraat 16 1322 CE Almere The NetherlandsMobile: +31 653 29 50 32 Office: +31 36 54 62 email@example.com://www.arizonachemical.com37