Different cross-linking strategies: Self-crosslinking acrylic for 1K and 2K waterborne woodcoatings European Coatings CONFERENCE Parquet and furniture coatings 04 – 05 February 2014, Düsseldorf | Germany Dr. Eva Tejada, Dr. Maria Almató, Dr. Hans Grablowitz Agenda/ Content Introduction Comparison of different acrylic dispersions New OH acrylic dispersion Conclusions Demands on industrial furniture coatings Mechanical properties Scratch resistance Mar resistance Chemical properties Water resistance Stain resistance Solvent resistance Domestic compounds Appearance properties Transparency / Wood warmth Matt / Gloss ✔ Resistance responsible for durability and appearance for attractiveness of the coating Page 3 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Demands on industrial furniture coatings Product & application properties Storage stability Easy to apply Competitive price Drying & curing time Stackability Sandability Blocking resistance Laws and regulations e.g.: SED 1999/13 National regulations Page 4 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Types of WB dispersions PES PUDPAC PUD PESPUD PAC Secondary dispersions Self-crosslinking PESPAC Page 5 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Core-shell OH functional Primary dispersions Si functional Types of WB dispersions Secondary dispersions PAC Self-crosslinking OH functional Primary dispersions Page 6 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Primary vs. secondary dispersions Emulsion polymerisation: water + surfactants Multistep process: Polymerization in solvent Neutralization + Dispersion Primary dispersion Strong physical drying High Mw: ~106 Secondary dispersion High gloss and transparency Low Mw: ~ 104 Primary and secondary PAC to meet all wood coating requirements Page 7 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Types of WB dispersions Secondary dispersions PAC Self-crosslinking OH functional Primary dispersions Page 8 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Self-crosslinking mechanisms 1K system • • • • … Self-condensation of methylolacrylamide Metal complex (chelates, salts) Self-condensation of organofunctional silanes Ketone acid / dihydrazine Page 9 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Types of WB dispersions Secondary dispersions PAC Self-crosslinking OH functional Primary dispersions Page 10 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf 2K Crosslinking systems functional polymer dispersion 2K system • • • • … Carboxi group + melamine Carboxi group + aziridine Carboxi group + carbodiimide Polyol + polyisocyanate X Pot-life X X X= functional group Page 11 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf 2K Systems Polyurethane + + Polyaddition (Crosslinking, curing) Polyol (Component A) + Polyisocyanate (Component B, PIC) Polyurethane Polymer Polyisocyante phase is dispersed and homogenized Result: "Polyisocyanate-in-polyol“ emulsion The polyisocyanate is mixed into polyol. Polyolparticle Polyisocyante droplet Page 12 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf The choice of polyisocyanate • Hydrophilisation level: easiness of mixing, film appearance, chemical resistance Low viscosity, hydrophobic Hydrophillic 0 100 0 100 0 100 Highly hydrophillic • Hydrophillisation type: chemical resistance PET-PIC External emulsifier PET modified Highest chemical resistance Anionic modified Page 13 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf An-PIC Agenda/ Content Introduction Comparison of different acrylic dispersions New OH acrylic dispersion Conclusions Types of WB dispersions Secondary dispersions PAC Self-crosslinking OH functional Primary dispersions Page 15 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Acrylic dispersions PAC 1 OH PAC 1 Primary dispersion OH funtional OH PAC 2 PAC 2 Self-Xlinked Secondary dispersion Page 16 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf New OH PAC Products comparison PAC 1 PAC 2 New OH PAC OH PAC 1 OH PAC 2 Primary Primary Primary Primary Secondary Technology 1K 1K 1K/2K 2K 2K Self-X-linking No No No Solids (%) 40 43 38 42 40 MFFT (ºC) 60 45 70 70 10 Tg(ºC) 60 50 65 90 50 % OH 0 0 1,5 2 3 Type of disp. Page 17 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Products comparison: 1K PAC 1 PAC 2 New OH PAC Primary Primary Primary Technology 1K 1K 1K/2K Self-X-linking No Solids (%) 40 43 38 MFFT (ºC) 60 45 70 Tg(ºC) 60 50 65 % OH 0 0 1,5 Type of disp. Page 18 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Performance comparison in 1K 5 4 3 New OH PAC PAC 1 2 PAC 2 1 0 Stains Resistance • Solvent Resistance Fast Drying Sandability Blocking Anfeuerung Self-X-linking is necessary to improve: Resistance against solvent Drying and consequently sandability and blocking Page 19 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Products comparison: 2K New OH PAC OH PAC 1 OH PAC 2 Type of disp. Primary Primary Secondary Technology 1K/2K 2K 2K Self-X-linking No No Solids (%) 38 42 40 MFFT (ºC) 70 70 10 Tg(ºC) 65 90 50 % OH 1,5 2 3 Page 20 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Performance comparison in 2K 5 4 3 New OH PAC OH PAC1 2 OH PAC 2 1 0 Stains Resistance • • • Fast Drying Sandability Stackability Anfeuerung Pot-life Primary dispersions are faster in drying and leads to higher productivity Secondary dispersions give better appearance on wood High molecular weight leads to shorter pot-life Page 21 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Agenda/ Content Introduction Comparison of different acrylic dispersions New OH acrylic dispersion Conclusions New OH PAC properties Self-crosslinking OH functional PAC dispersion for 1K and 2K WB applications Product highlights Suited for clear and pigmented coatings, primers and topcoats Useful for 1K and 2K applications VOC content < 130 g/l possible High chemical resistance High solvents resistance Low cost 2K coating formulation possible Page 23 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf New OH PAC 1K system OH X X drying, RT X OH OH X OH 2K system OH OH OH NCO OH OH OH OH NCO OH OH OH OH OH OH OH OH OH OH OH OH OH OH X= functional group OH OH OH OH OH OH OH OH Page 24 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf OH OH OH New OH PAC Coating properties: 1K and 2K 1K clear 1K clear +10 % AnPIC 2K pigmented + 20% AnPIC 50 / 70 / 100” 150” 65 / 85 / 100” 120” 70 / 127 / 145“ 150” Sand dry (T1) approx. 30’ approx. 30’ approx. 30’ Total dry (T4) approx. 50’ approx. 80’ approx. 7h Gloss 20º / 60º / Haze (%) 81 / 91 /30 83 / 90 / 30 70 / 87 / 70 5 5 5 5/3 5/5 5/5 Red wine resistance - 6 h 3 5 5 American mustard resistance - 6 h 5 5 5 Ethanol 48% resistance - 1 h 5 5 5 Acetone resistance - 1 min 5 5 5 Pendulum hardness (König), 1 / 3 / 7 d at RT 16 h at 50ºC Water resistance - 16 h Coffee resistance - 1h / 16 h Drying measured over glass (200mm wet) at 23ºC and 50% RH. Chemical resistance evaluated on coated birch panel ( 5=very good; 1= very bad). Page 25 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf DIN 68861 Test New OH PAC Chemical resistance New OH PAC Self-crosslinking OH functional PAC dispersion New OH PAC 1K IKEA R2 2K Clear Pigmented Clear Pigmented DIN 68861 1B Good chemical resistance is achieved as 1K Higher level achieved by addition of a polyisocyanate Page 26 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf New OH PAC Industrial application data Sandability Blocking Resistance 5 5 4 4 3 3 1K formulation 2 2K formulation 1 2 1 0 0 0 2 4 Test details: - Application: - Drying: - Stacking: - Evaluation 6 8 10 12 14 16 18 20 22 24 Drying time (h) at 40ºC g/m 2 120 wet on leneta foil 15’ flash-off at RT before drying at 40ºC Face to face for 1h at 40ºC, 100 g/cm 2 5: Best, 0: Worse No anti-blocking additives/waxes have been used in this test 0 2 Test details: Application: Drying: Sanding: Evaluation 4 6 8 10 12 14 16 18 20 22 24 Drying time (h) at RT 120 g/m 2 wet on Sapelly wood RT 320 grit sand paper 5: Best, 0: Worse No sanding aids have been used in this test Page 27 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf New OH PAC Results on parquet coating New OH PAC 1K New OH PAC 2K 10 % PETPIC PUD1 1K PUD1 / New OH PAC 7:3 1K 30 / 65 100 80 / 100 110 54 / 57 60 67 / 70 73 Sand dry (T1) approx. 30’ approx. 40’ approx. 40’ approx. 40’ Total dry (T4) approx. 60’ approx. 80’ approx. 105’ approx. 90’ Gloss 20º / 60º / Haze (%) 80 / 89 / 40 68 / 83 / 40 82 / 89 / 7 84 / 90 / 11 Water resistance - 4 h / 24 h 5/4 5/5 5/5 5/5 Scratch water resistance - 4h / 24 h 5/5 5/5 5/5 5/5 EtOH resistance – 5’ / 30’ 5/5 5/5 5/3 5/3 Scratch EtOH resistance - 5’ / 30’ 5/4 5/5 5/3 5/3 3 5 3 3 83 / 91 80 / 90 15 / 4 21 / 20 Pendulum hardness (s,König), 1 / 7d at RT 16 h at 50ºC Black Heel Mar Resistance Abrasion Taber CS10 / CS17 – mg lost after 1000 rev (10N load) Drying and pendulum hardness measured over glass (200mm wet) at 23ºC and 50% RH. Chemical resistance evaluated on coated oak panel (3 x 120mm wet) ( 5=very good; 1= very bad). Product not assessed in VOC emission tests New OH PAC could be used in parquet coating in 1K, 2K or as combination partner with a PUD Page 28 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf New OH PAC Results on exterior 100 Gloss at 60º 80 60 40 20 0 0 500 1000 1500 hours QUV A Test 2000 2500 New OH PAC New OH PAC/PUD 2 1:1 New OH PAC/PUD 2 3:7 PUD 2 New OH PAC New OH PAC/ PUD 2, 1:1 New OH PAC/ PUD 2, 3:7 PUD 2 Evaluation under UNE_EN 927-6:2007. Formulation containing HALS Testing conditions: 24h of condensation / 48 cycles of 3h consisting of 2,5h UV + 0,5h water spray Total length of the test: 2016 hours (12 weeks) Application: 3 x 150g/m2 on massive pinewood Clear coatings based on New OH PAC passes weathering test according DIN EN ISO 927-6 (QUV-Spray). It can be used alone or as combination partner for PUDs. Page 29 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Summarizing… A comparison study has been made for different acrylic dispersions for wood coatings both in 1K as well in 2K systems. Primary dispersions have stronger physical drying resulting in better productivity (faster sandability and blocking development) both in 1K as well in 2K systems. Transparency and gloss of the coating will be inferior than with secondary dispersions. Crosslinking is necessary to have good solvent resistance. Real 2K polyurethane systems are necessary for the formulation of pigmented coatings with high level of chemical resistance. The use of the New OH PAC, allows the formulation of both 1K as well as 2K with a medium-high performance respectively, giving lot of freedom and versatility to the formulator and end-user to get the desired level of coating performance: IKEA R2 requirements for 1K clear coatings and DIN 68861 at level 1B in 2K clear or pigmented. Different applications opportunities are seen for this new resin. Page 30 • European Coatings CONFERENCE Parquet and furniture coatings • 04 – 05 February 2014, Düsseldorf Thank you!
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