dispersing agents – the key to unlocking the performance of waterborne direct-to-metal coatings
TRANSCRIPT
150 years Dispersing agents – the key to unlocking the performance of waterborne direct-to-metal coatings Joncryl® PRO, Dispex® Ultra and Hydropalat®
150 years
Dr. Rainer Erhardt, Dr. Sascha OestreichEuropean Coatings Show 2015
150 years
Table of contents
Dispersion: Joncryl® PRO 1522
Dispersing agents
Formulation
Corrosion testing Salt spray test Condensation water test
and water spot test
Conclusion
Key drivers for water-borne DTM coatings
® = Registered trademark of the BASF Group 2
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Key drivers for water-borne DTM coatings for protective / industrial applications
Keyword sustainability: ecological, economical and social compontents
Influenced by SHE legislation:
- Safety (low flammability)
- Health (exposure to VOCs)
- Environment (waste, etc.)
Ease/cost of use: one layer only
Advances in technical performance of acrylicdispersions based coatings
Improved corrosion protection (but still limited to C1-C3*)
Fast drying & recoating times
Improved chemical resistance
Good UV resistance
* Corrosion classes for coatings on steelaccording to EN ISO 12944
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Dispersion: Joncryl PRO 1522
Specifically developed for DTM-coatings:
Non-migrating protective colloid
Superior light stability
Physical data:Solid content in % 45Viscosity at 25 °C (Brookfield) 400Density in g/cm3 1.056pH-value 9Glass transition temperature (Tg, DSC) 34Minimum film-forming temperature (MFT) 26Freeze/thaw-stable Yes
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Dispersants: low molecular weight
Dispex® Ultra FA 4404: phosphonate
Dispex Ultra FA 4483: phosphoric acid ester
Hydropalat® WE 3425: phosphoric acid ester
Dispex Ultra FA 4416: mixture of ionic and non-ionic emulsifiers (APEO free)
® = Registered trademark of the BASF Group 5
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Dispersants: high molecular weight
Dispex Ultra PA 4550, PA 4560: modified polyacrylates
Dispex Ultra PA 4570: universal modified polyacrylate(for water-borne and solvent-borne)
Dispex Ultra PA 4580: acrylic emulsion polymer (neutralized)
Dispex Ultra PA 4590: modified polyacrylate
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Dispersants: high molecular weight polycarboxylates
Dispex Ultra CX 4231: hydrophobic polycarboxylatecopolymer
Polyacrylic acid Polycarboxylatecopolymers
Hydrophobic Polycarboxylatecopolymers
Hydrophobic character
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High molecular weight dispersants Modes of stabilization
Electrostaticstabilization
Electrostericstabilization
Improved electrostericstabilization
Stericstabilization
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Dispersants: high molecular weight, CFRP* based
Dispex Ultra PX 4575: acrylic block copolymer with improved electrosteric stabilization
Dispex Ultra PX 4585: acrylic block copolymer
*CFRP: Controlled Free-Radical Polymerization
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Model system: water-borne DTM coatingCoating Formulation
GrindWater 7.83Dispersant See tableHydropalat® WE 3650 0.07 (1)FoamStar® SI 2210 0.12 (1)Ammonia 25 % 0.07KRONOS® 2190 17.89 (2)Grind 30 min at 3400 rpm to Hegman grind 7 (< 10 µm)
Let-down, add while stirringJoncryl® PRO 1522 59.26 (1)
Add mix ofWater 1.86Solvenon® PnB 4.01 (1)Solvenon® DPnB 4.01 (1)
AddFoamStar® SI 2210 0.08 (1)Halox® 515 1.88 (3)BenzoflexTM 9-88 1.33 (4)Ammonia 25 % 0.16
Total app. 100pH app. 9Density in g/cm3 1.21PVC in % 14.1Solids in % 47.8VOC in g/l 200
(1) BASF SE(2) KRONOS Worldwide. Inc.(3) ICL\Advanced Additives(4) Eastman Chemical Company
® = Registered trademark of the BASF Group 10
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Dispersants: Dosage and properties
DispersantDispex® Ultra
Hydropalat®
WE 3425
Dispex® UltraComp. A
FA 4404 FA 4483
FA 4416
CX 4231
PA 4550
PA 4560
PA 4570
PA 4580
PA 4590
PX 4575
PX 4585
Mass dispersantin g 0.40 0.60 0.30* 0.60 1.00 1.00 1.00 1.00 2.00 1.00 1.43 1.00 1.50
Solid contentdispersant 0.50 0.30 1.00 0.75 0.30 0.50 0.40 0.60 0.40 0.40 0.40 0.50 0.40
Dispersant on pigment ratio in %
1.12 1.01 1.68 2.52 1.68 2.79 2.24 3.35 4.47 2.24 3.20 2.79 3.35
Viscosity in m Pa*s (plane-cone, shear rate 500 1/s)
204 82 167 360 226 79 69 133 226 75 126 104 95
*Please note:Hydropalat® WE 3425 has to be dissolved and neutralized prior to use (in 10 g water, neutralize with ammonia; reduce amount of water in recipe accordingly)
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Salt Spray Test according to DIN EN ISO 9227: (on cold rolled steel (CRS); degree of blistering: ISO 4628-2, degree of rusting: ISO 4628-3)
Dispersant DispexUltra FA 4404
DispexUltra FA 4483
HydropalatWE 3425
DispexUltra FA 4416
DispexUltra CX 4231
DispexUltra PA 4550
DispexUltra PA 4560
DispexUltra PA 4570
DispexUltra PA 4580
DispexUltra PA 4590
DispexUltra PX 4575
DispexUltra PX 4585
Comp. A
DFT in µm 61 64 65 65 66 59 70 76 73 63 63 74 66
SST 48h
Degree of blistering 2(S3)* 0(S0) 0(S0) 0(S0)** 2(S4)* 0(S0)* 0(S0)* 0(S0) 0(S0) 0(S0) 0(S0) 0(S0) 0(S0)
Degree of rusting Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0
SST 120h
Degree of blistering 5(S3)* 0(S0)* 0(S0)* 2(S3)* 5(S5)* 4(S5)* 2(S4)* 0(S0)* 0(S0) 0(S0)* 0(S0)* 2(S3) 2(S3)*
Degree of rusting Ri 5 Ri 0 Ri 0 Ri 2 Ri 5 Ri 5 Ri 3 Ri 0 Ri 0 Ri 0 Ri 0 Ri 2 Ri 2
SST 144h
Degree of blistering 0(S0)* 2(S2)* 2(S4)* 0(S0)* 0(S0) 0(S0)* 0(S0)* 2(S3)* 2(S4)*
Degree of rusting Ri 1 Ri 3 Ri 3 Ri 0 Ri 0 Ri 0 Ri 0 Ri 2 Ri 3
SST 168h
Degree of blistering 0(S0)* 0(S0) 0(S0)* 0(S0)* 2(S3)* 2(S4)*
Degree of rustting Ri 0 Ri 0 Ri 1 Ri 0 Ri 2 Ri 4
SST 216h
Degree of blistering 0(S0)* 0(S0) 0(S0)* 0(S0)*
Degree of rusting Ri 1 Ri 0 Ri 2 Ri 2
SST 288h
Degree of blistering 2(S3)* 0(S0)* 2(S3)* 0(S0)*
Degree of rusting Ri 2 Ri 0 Ri 2 Ri 2* Additionally blisters at the scribe were observed; to determine the degree of blistering according to ISO 4628-2 only the area on top of the scribe was used** no blisters observed but some structure on the surface = test finished already 12
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Photos of CRS panels after 120 h Salt Spray Test
1313
4231 45504404 4483 44163425
45854575 Comp. A4560 4570 4580 4590
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Water Spot Test / Condensation water test DIN EN ISO 6270-2 on CRS
Dispersant Dispex Ultra FA 4404
Dispex Ultra FA 4483
HydropalatWE 3425
Dispex Ultra FA 4416
Dispex Ultra CX 4231
Dispex Ultra PA 4550
Wasser Spot Test (drop of demin. water, 24 h) Cross cut immediately GT5 GT5 GT5 GT5 GT 5 GT524 h after exposure GT1 GT2 GT5 GT5 GT 3 GT2Comment Brown imprint - - - Small blisters -
Condensation Water Test according to DIN EN ISO 6270-2Gloss @ 60° before exposure: 84-8624 hDegree of blistering ISO 4628-2 3(S3) 0(S0) 0(S0) 0(S0) 0(S0) 0(S0)Degree of rusting ISO 4628-3 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0336 hDegree of blistering ISO 4628-2 3(S3) 0(S0) 0(S0) 0(S0) 0(S0) 0(S0)Degree of rusting ISO 4628-3 Ri 4 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0Gloss @ 60°, 24 h after exposure 28 57 75 73* 23 81
* Pinholes observed 14
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Water Spot Test / Condensation water test DIN EN ISO 6270-2
Dispersant DispexUltra PA 4560
DispexUltra PA 4570
DispexUltra PA 4580
DispexUltra PA 4590
DispexUltra PX 4575
DispexUltra PX 4585
Comp. A
Wasser Spot Test (drop of demin. water, 24 h) Cross cut immediately GT5 GT5 GT5 GT5 GT5 GT5 GT524 h after exposure GT1 GT1 GT2 GT1 GT2 GT2 GT1Comment - - - - - - -
Condensation Water Test according to DIN EN ISO 6270-2Gloss @ 60° before exposure: 84-8624 hDegree of blistering ISO 4628-2 0(S0) 0(S0) 0(S0) 0(S0) 0(S0) 0(S0) 0(S0)Degree of rusting ISO 4628-3 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0336 hDegree of blistering ISO 4628-2 0(S0) 0(S0) 0(S0) 0(S0) 0(S0) 0(S0) 0(S0)Degree of rusting ISO 4628-3 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0 Ri 0Gloss @ 60°, 24 h after exposure 51 61 38 34 36 54 51
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Shows excellent anti-corrosive performance in combination with the suitable dispersant
Conclusion
Shows superior salt spray performance
Good in both, salt spray and condensation water test
(Not shown): Results can be transferred to other (suitable) dispersions and inorganic pigments
Joncryl PRO 1522 Dispex Ultra PA 4580 Dispex Ultra PA 4570
• Compatibility with binder matrix seems to be very important: both products are acrylics
• Both Dispex types are multifunctional and contain both amino and hydroxy moieties
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Please get in touchYou are highly welcome at our BASF booth No. 523, hall 7a
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Dr. Rainer ErhardtTechnical [email protected]
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