Past and Future of Universal Colorants in Coatings. Gülcay Bükrü, Evonik Resource Efficiency

Transcription

1 Past and Future of Universal Colorants in Coatings Gülcay Bükrü, Evonik Resource Efficiency 1

2 Universal Colorants can be described as colorants that color waterborne and solventborne architectural coatings. Grinding Resin Dispersants Pigments Humectants Solvent/Water 2

3 Universal Colorants are a challenge Dispersions have to be stable and portioned via dispenser Waterborne White Base Tinted Base Paint They have to be compatible in waterborne and solventborne architectural coatings and should give high color strength Pigment Concentrate Their influence on other properties of the coating should be acceptable Solventborne White Base Tinted Base Paint 3

4 The Colorant Market Pigment concentrates for coatings by technology 2013 [%] Universal 100% Solid 10% <5% WB Binder free SB ~25% ~55% WB Binder Containing <5% Total 2013: 513 kt Source: IHS Studies for Carbon black, titanium dioxide, organic color pigments, inorganic color pigments and effect pigments, BL AB Analysis 4

5 Past and Future of Universal Colorants in Coatings APEs and replacements Present Solutions for Compatibility Outlook 5

6 Past and Future of Universal Colorants in Coatings APEs and replacements Present Solutions for Compatibility Outlook 6

7 NPE structures non-ionic anionic 7

8 The Nonylphenol Issue H 3 C CH 3 OH Degradation H Nonylphenolethoxylate (NPE) HO Nonylphenol HO H H 17β-estradiol NPE is very toxic to fish and other water dwelling organisms and is considered a hormone disrupting substance, mimicking estrogen. 8

9 Polyether and polyether phosphates as replacement 9

10 Compatibility of replacements delta E 1,0 0,8 0,6 0,4 0,2 0,1 Heliogen Blue L 7101F 0,7 0,3 0,1 0,4 0,8 Acceptable Limit E values, white base tinted with 10% colorant w/b PUR/Acrylic s/b Alkyd 0,0 polyether phosphate Polyether phosphate Fatty acid derivative 1,0 Bayferrox ,9 delta E 0,8 0,6 0,4 0,6 0,3 0,5 0,3 0,7 Acceptable Limit 0,2 0,0 Polyether phosphate Polyether phosphate Fatty acid derivative 10

11 Polyether phosphates show low influence on Water Uptake at High Addition Levels w24-value 1,2 1,1 1,0 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 0,1 0,8 0,4 <0,1 <0,1 1,0 0,5 0,15 <0,1 1,1 1,0 0,3 0,2 W24-values [kg/m² 24h] acc. to DIN EN , Class 3: w24 < 0,1 Tinted with 10% PR 101 pigment concentrate 0,0 not tinted Polyether phosphate Fatty acid derivative 1st watering 2nd watering 3rd watering 4th watering Target limit after 4th cycle acc. to DIN EN

12 The Critical Year 2010 Viscosity increase after tinting High solid alkyd paints with VOC < 300 g/l have a very limited ability to emulsify water. Two major problems: High rub-out values 12

13 Viscosity Increase Depends on Water Content Universal colorant based on PB 15:4 in 2010 HS alkyd paint 3000 paint viscosity afetr tinting in mpas water content of colorant in % 13

14 Many Universal Colorants show Low Compatibility in new Alkyds Rub - out values with Bayferrox Red 130 M 4,00 3,50 PUR/Acrylic w/b Alkyd s/b HS ,00 delta E - value 2,50 2,00 1,50 1,00 0,50 0,00 Sample A Sample B Sample C Sample D Sample E Sample F Sample G 14

15 Past and Future of Universal Colorants in Coatings APEs and replacements Present Solutions for Compatibility Outlook 15

16 1% Water added to Alkyd-Base without Compatibilizer Large water droplets 16

17 1% Water added to Alkyd-Base with Compatibilizer Much better distribution of water 17

18 Without Compatibilizer With Compatibilizer 18

19 1% Pigment Paste added to clear Alkyd-Base droplets up to about µm in diameter 19

20 1% Pigment Paste added to clear Alkyd-Base with compatibilizer droplets significantly smaller with compatibilizer 20

21 Without Compatibilizer With Compatibilizer 21

22 Interface Colorant/Base Interface Colorant/Base with Compatibilizer 22

23 Compatibilizer Mechanism Effect in Solventborne Systems Pigments stabilized in water are added to solventborne paint Water is emulsified Hydrophobic chain of additive can take over stabilization 23

24 Universal Colorant based on PR 101 in White Alkyd Base blank delta E 5 4 1,0% sample C 3 0,5% sample C 0,5% sample A 2,0% sample A 1,0% sample B 2 2,0% sample C 2,0% sample B 1 0,5% sample B 1,0% sample A abs. color strength F 24

25 Viscosity of White Base Viscosity [mpas] % 3% 3% blank Sample A Sample B Sample C Viscosity: 24h after production at sherrate: [1/s] in mpa*s storage after 1 week at 40 C storage after 2 weeks at 40 C storage after 4 weeks at 40 C 25

26 Drying time of White Base 09:36 08:24 07:12 06:00 hours 04:48 03:36 02:24 01:12 00:00 Nullprobe 3% Sample A 3% Sample B 3% Sample C Phase 1 Phase 2 Phase 3 26

27 The Chemistry with Good Color Performance and Low Influence Amidoamine 27

28 Past and Future of Universal Colorants in Coatings APEs and replacements Present Solutions for Compatibility Outlook 28

29 Universal Colorants for Industrial Coatings water based main binders 2p PU 1p PU/acrylic 1p (styrene) acrylic solvent based main binders 2p PU PES/melamine alkyd/melamine TPA, CAB alkyd 29

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