PO LY URET H ANES M A G A Z I N E I N T E R N AT I ON A L 04/2015 www.pu-magazine.com AUGUST/SEPTEMBER ustry ind foam le flexib ik n a e Evon , n e Europ lds L. Kje h t i an ntsm iew w u v r H e , t s In nkin t T. Ha h t i onten w c w d e e i l v yc Inter h rec t i w s yol r pol e t s e Poly ns olutio s e r fi ture Furni SIMPLER FORMULATIONS. GREATER POSSIBILITIES. Simplified formulations mean simplified processes and enhanced versatility to meet tomorrow’s challenges. Dow is making it happen with its broad portfolio of products, including VORANOL™ 425XL Mannich polyol. Complementing a wide array of innovative solutions, VORANOL 425XL Mannich polyol offers formulators exceptional spray foam formulating flexibility. This product features a built-in amine catalyst, providing superior green strength, dimensional stability and enhanced cold surface adhesion. It also offers significantly lower viscosity, enabling easier handling, higher loading levels, lower B-side viscosity, better A/B mixing and increased foam yield. VORANOL 425XL is just the beginning. As a global leader in polyurethane chemistry, Dow has the dedicated customer and technical services to help you simplify your processes – and expand your business. www.dow.com/polyurethanes ®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow M. Wintermantel, F. Schade, T. Schüttler, K. H. Wührer Efficient path to flexible floor coating New raw materials open up further possibilities for Pasquick polyaspartic technology Polyaspartic technology makes coating operations particularly cost-efficient, because fewer coating layers are required in many cases. What’s more, the layers cure very quickly. However, two factors have previously restricted the use of polyaspartic systems for floor coating applications. On the one hand, it was virtually impossible to formulate systems that could be applied manually. On the other, most polyaspartic coatings were not sufficiently flexible to bridge any cracks forming in the concrete. As part of its Pasquick program, Covestro (formerly Bayer MaterialScience) has developed new, low-viscosity raw materials that overcome these limitations of polyaspartic technology. 1 Introduction A building’s external floor surfaces need to withstand a great deal. Roof gardens and the various types of balconies are exposed to sunlight and weathering. What’s more, they are often subject to significant mechanical stresses. Consequently, the supporting concrete substrate needs to have a lightfast and resistant protective coating. appropriate protective coating, cracking allows moisture to penetrate into the concrete. When this freezes and subsequently thaws again, the concrete spalls in some places. In the case of balconies, this may lead to a reduced load-bearing capacity. The moisture may also penetrate into adjacent floor slabs. Like all systems for building applications, floor coatings also need to comply with the existing VOC (volatile organic compound) directives. The Decopaint Directive (2004/42/EU), which regulates trade coating, is the principal directive throughout the EU. There are also national regulations such as the evaluation system for VOC emissions of the AgBB (Committee for Health-Related Evaluation of Building Products) in Germany. Coating systems are available on the market that meet these requirements in principle but leave something to be desired in terms of their application and, in particular, cost-effectiveness. Covestro has now developed a system that delivers significant benefits in this respect. It is based on Pasquick polyaspartic technology, which has already demonstrated its effectiveness in other applications since the 1990s. Solvent-free polyaspartic coatings are based on the reaction of an aliphatic polyisocyanate with a polyaspartic ester. New, low-viscosity raw materials are now enabling this technology to move into the floor coating market – in particular for external building applications, but also for comfort and sports flooring. Please register to download the full article. This coating must retain its protective function even if cracks form in the concrete over time. This can happen, for example, as a result of the ground moving or the concrete drying out and shrinking. Without an Formulation Standard PAE* / g 1 2 3 4 5 80.0 100.0 80.0 100.0 80.0 Low-viscosity PAE / g – 20.0 – 20.0 20.0 Standard PIC1** / g 70.6 – – – 29.3 – 149.7 Tab. 1: Standard PIC2 / g Overview of various New PIC / g – – polyaspartic formulations Crosslinking / % 110 % 110 % tested. Formulations 3, 4 and 5 contain the new Viscosity / mPas HDI polyester prepolymer *PAE = polyaspartic ester; **PIC = polyisocyanate (new PIC) – – – 151 149.7 88 110 % 110 % 110 % <1,500 <1,500 <1,500 Dr. Matthias Wintermantel [email protected] 120 Frank Schade, Thomas Schüttler, 100 Working time / min Karl H. Wührer Business Unit Coatings, Adhesives, Specialties, Application Development Infrastructure-Coatings Covestro (formerly Bayer MaterialScience AG), Leverkusen 80 60 40 20 Paper, ETCC 2014 (European Technical Coatings 04/2015 AUGUST/SEPTEMBERPOLYURETHANES MAGAZINE INTERNATIONALEuropean fl exible foam industryInterview with L. Kjeldsen, EvonikInterview with T. Hankins, HuntsmanPolyester polyols with recycled contentwww.pu-magazine.comFurniture fi re solutionsSimplified formulations mean simplified processes andenhanced versatility to meet tomorrow’s challenges.Dow is making it happen with its broad portfolio ofproducts, including VORANOL™ 425XL Mannich polyol.Complementing a wide array of innovative solutions,VORANOL 425XL Mannich polyol offers formulatorsexceptional spray foam formulating flexibility. Thisproduct features a built-in amine catalyst, providingsuperior green strength, dimensional stability andenhanced cold surface adhesion. It also offerssignificantly lower viscosity, enabling easier handling,SIMPLER FORMULATIONS.GREATER POSSIBILITIES.higher loading levels, lower B-side viscosity, better A/Bmixing and increased foam yield.VORANOL 425XL is just the beginning. As a globalleader in polyurethane chemistry, Dow has thededicated customer and technical services to help yousimplify your processes – and expand your business.www.dow.com/polyurethanes®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow312 PU MAGAZINE – VOL. 12, NO. 4 – AUGUST/SEPTEMBER 2015M. Wintermantel, F. Schade, T. Schüttler, K. H. WührerDr. Matthias [email protected] Schade,Thomas Schüttler,Karl H. WührerBusiness Unit Coatings, Adhesives, Specialties,Application Development Infrastructure-CoatingsCovestro (formerly Bayer MaterialScience AG),LeverkusenPaper, ETCC 2014 (European Technical CoatingsCongress), 3 – 5 September 2014, Cologne, GermanyPublished with kind permission of FATIPEC1 IntroductionA building’s external fl oor surfaces need towithstand a great deal. Roof gardens and thevarious types of balconies are exposed tosunlight and weathering. What’s more, theyare often subject to signifi cant mechanicalstresses. Consequently, the supporting concretesubstrate needs to have a lightfast andresistant protective coating.This coating must retain its protective functioneven if cracks form in the concreteover time. This can happen, for example, asa result of the ground moving or the concretedrying out and shrinking. Without anappropriate protective coating, crackingallows moisture to penetrate into the concrete.When this freezes and subsequentlythaws again, the concrete spalls in someplaces. In the case of balconies, this maylead to a reduced load-bearing capacity.The moisture may also penetrate into adjacentfl oor slabs.Like all systems for building applications,fl oor coatings also need to comply with theexisting VOC (volatile organic compound)directives. The Decopaint Directive(2004/42/EU), which regulates trade coating,is the principal directive throughout theEU. There are also national regulations suchas the evaluation system for VOC emissionsof the AgBB (Committee for Health-RelatedEvaluation of Building Products) in Germany.Coating systems are available on the marketthat meet these requirements in principle butleave something to be desired in terms of theirapplication and, in particular, cost-effectiveness.Covestro has now developed a systemthat delivers signifi cant benefi ts in this respect.It is based on Pasquick polyaspartic technology,which has already demonstrated its effectivenessin other applications since the 1990s.Solvent-free polyaspartic coatings are basedon the reaction of an aliphatic polyisocyanatewith a polyaspartic ester. New, low-viscosityraw materials are now enabling this technologyto move into the fl oor coating market – in particularfor external building applications, butalso for comfort and sports fl ooring.Polyaspartic technology makes coating operations particularly cost-effi cient, becausefewer coating layers are required in many cases. What’s more, the layers cure very quickly.However, two factors have previously restricted the use of polyaspartic systems for fl oorcoating applications. On the one hand, it was virtually impossible to formulate systems thatcould be applied manually. On the other, most polyaspartic coatings were not suffi cientlyfl exible to bridge any cracks forming in the concrete. As part of its Pasquick program,Covestro (formerly Bayer MaterialScience) has developed new, low-viscosity raw materialsthat overcome these limitations of polyaspartic technology.Effi cient path tofl exible fl oor coatingNew raw materials open up further possibilities forPasquick polyaspartic technologyFormulation 1 2 3 4 5Standard PAE* / g 100.0 80.0 100.0 80.0 80.0Low-viscosity PAE / g – 20.0 – 20.0 20.0Standard PIC1** / g 70.6 – – – 29.3Standard PIC2 / g – 149.7 – – –New PIC / g – – 151 149.7 88Crosslinking / % 110 % 110 % 110 % 110 % 110 %Viscosity / mPas <1,500 <1,500 <1,500*PAE = polyaspartic ester; **PIC = polyisocyanateTab. 1: Overview of variouspolyaspartic formulationstested. Formulations 3, 4and 5 contain the newHDI polyester prepolymer(new PIC)Fig. 1: The working time ofvarious polyasparticformulations1 2 3Formulation4 5020406080100120Working time / minPU MAGAZINE – VOL. 12, NO. 4 – AUGUST/SEPTEMBER 2015 3132 Benefi t of polyasparticsPolyaspartic esters originally served as reactivediluents in solventborne, two-componentpolyurethane (PU) coatings. Nowadays, theyare mostly used as the main component forreaction with a polyisocyanate and enablethe formulation of coatings with very lowVOC contents. Polyaspartic coatings of thiskind offer a several benefi ts:• Easy to apply and require only standardequipment.• Quick curing at room temperature, whichenables the coated items to rapidly resumetheir function in machinery, buildingsor installations, and molded parts to leaveproduction quickly. This results in far lowertotal coating costs.• Good film formation. Fewer layers areneeded than in other systems to producethe same total coating thickness.This, too, boosts productivity and costefficiency.• Resistance to weathering matches thehigh level achieved by two-componentpolyurethane coatings.These benefi ts are key factors in the successalready enjoyed by polyaspartic systemsin a number of applications. Amongother things, they are used to protect industrialplants, wind turbines, bridges and agriculturalor construction machinery againstcorrosion and as an automotive refinishcoating. The systems are also already inuse for fl oor coatings, but the relevant formulationscannot be applied using a rolleror brush, and they are relatively hard andrigid.3 Low viscosity,new possibilitiesThe key to fl exible polyaspartic fl oor coatingsthat can be applied manually are bindersand crosslinking agents with a lowerviscosity than was previously available. Inthe polyaspartic ester context, Covestrointroduced a binder with a viscosity of just100 mPas and a comparatively low reactivityin 2013. It takes such formulations approximately1.5 hours to gel, which meansthe pot life is sufficiently long (formulation2; tab. 1 and fi g. 1). Previously, theonly polyaspartic binders available werelow-viscosity ones that gelled with thecrosslinking agent after just a few minutesor had a viscosity of around 1,000 mPas(formulation 1). In conjunction with establishedbinders and crosslinking agents, thelow-viscosity binder made it possible to producesolvent-free, two-component floorcoatings that were easy to apply with a rolleror brush. Thanks to the rapid curing,several layers of such polyaspartic systemscan be applied in a single day and the surfacecan be walked on within just a fewhours. This minimizes downtimes on buildingsites and cuts costs, but the coatingsare hard and cannot bridge cracks (formulation2: fi g. 2).Consequently, Covestro developed a newcrosslinking agent, a hexamethylene diisocyanate(HDI) polyester prepolymer, with lessthan a quarter of the viscosity of the standardproduct (1,350 mPas vs. 6,000 mPas).A patent is pending for this crosslinkingagent, which now also enables the formulationof fl exible, solvent-free fl oor coatings(formulations 3 – 5: fi g. 2). The fl exibility ofthese coatings is also shown in fi gure 3,which gives a comparison of the elongationat break. Polyaspartic formulations based onthe new crosslinking agent and the low-viscositybinder thus meet all the demandsplaced on fl oor coatings for external buildingapplications. The mechanical properties canbe tailored to the relevant application byvarying the mixing ratio of conventional andnew crosslinking agent, and of conventionaland low-viscosity binder.4 ConclusionA new HDI polyester prepolymer – a crosslinkingagent with very low viscosity – and alow-viscosity binder that has been availablesince 2013 are opening up completely newpotential applications for Pasquick polyaspartictechnology. The resulting coatings canbe applied using a roller, have crack-bridgingproperties, are lightfast and exhibit resistanceto chemicals and mechanical influences.They cure quickly, which helps reducedowntimes and cut costs. What’s more, theycontain no monomers or reactive diluentsand comply with all VOC directives. The propertiesof polyaspartic fl oor coatings are thusunique and have the edge over other systems.Fig. 2: Hardness (Shore A and D) of various polyaspartic formulationsFig. 3: Relation of nominal elongation at break for the new crosslinking agent and low-viscosity binder2 3Formulation4 530405060708090Hardness / Shore A1 2 530405060708090FormulationHardness / Shore D3 d RT14 d RT3 d RT + 3 d 50 °C3 d RT + 7 d 50 °C3 d RT14 d RT3 d RT + 3 d 50 °C3 d RT + 7 d 50 °C2 3 4 50100200300400Relative elongationat break / %1FormulationPublication information & contactsReference to common names, trade names, names of goods, etc., does not warrant the assumptionthat such names are unrestricted and may therefore be used by anyone. Legally protectedregistered trademarks are often involved, even if these are not expressly shown as such.Subscriptions, terms of receipt and delivery:Annual subscription fee EUR 120 (6 issues per year incl. delivery costs). 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GuptaDr. Isabella KappnerDipl.-Biol. Markus LindenDr. Stephanie Waschbüschin memoriam Dipl.-Chem. Frank A. Gupta †FreelancerDr. Stefan Albus (ALS)Angela Austin, M. Sc. (AA)David Vink (DV)Editorial assistantPatrizia SchmidtTel. +49 2102 9345-12AdvertisementIndira Gupta, Julian BäumerTel. +49 2102 9345-15SubscriptionNoemi JägerTel. +49 2102 9345-0LayoutUlrich Gewehr, Max GodenrathTel. +49 2102 9345-18Frequency of publication6 issues / yearPost distribution no. 66226ISSN 1864-5534Bank accountsDeutsche Postbank AGIBAN DE51 3601 0043 0516 1584 31BIC PBNKDEFFCommerzbank DüsseldorfIBAN DE43 3007 0024 0470 7170 00BIC DEUTDEDBDUE Congress), 3 – 5 September 2014, Cologne, Germany Published with kind permission of FATIPEC 312 Fig. 1: The working time of various polyaspartic formulations 0 1 2 3 Formulation 4 5 PU MAGAZINE – VOL. 12, NO. 4 – AUGUST/SEPTEMBER 2015
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