Polyetheralkanolamines ICE 2006
Transcript of Polyetheralkanolamines ICE 2006
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Use of Novel PolyetheralkanolamineComb Polymers as Pigment Dispersants
for Aqueous Coating Systems
Duy T. Nguyen, Ph.DHuntsman Performance Products
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Outline
Fundamental Structure-Property Relationship of Polyetheralkanolamine Copolymers
Optimization of PolyetheralkanolaminesStabilization mechanisms: steric and charge
Comparison with other conventional dispersants
Resin-containing pigment concentratesResin-free pigment concentrates
Conclusions
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Why use dispersants?
Good Dispersants
Flexibility Production capacity Quality
-VOC-free - Reduced milling time - Better dispersion stability-APE-free - Decreased dispersion viscosity - Increased color development-Compatible with binder to allow higher pigment loading - Maximun color acceptancetypes of all bases
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Polyetheralkanolamine Comb Polymers
P ERFANCE S PECIALTIES T ECHNOLOGY
Soluble chain
Anchoring group
Adsorption of a comb polymer at the pigment surface
Pigment
An effective dispersant should have:1) Anchoring groups2) Soluble chains3) Linkers
HydrophobicBackbone
HydrophilicChains
HydrophobicBackbone
HydrophilicChains
HydrophobicBackbone
HydrophilicChains
HydrophobicBackbone
HydrophilicChains
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Polyetheralkanolamine Comb Polymers (Patents Pending)
R O N OOH OH
O
O
x
y
R is aromatic or aliphatic
Hydrophilic teeth
2-3
CH3Nomenclature:P7E : x = 3 and y = 7P19E : x = 3 and y = 19P41E : x = 3 and y = 41P58E : x = 8 and y = 58
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Pigment Adsorption Studies
1) Fill the sample holder (made of aluminum and has small holes in bottom) with pigment
2) Compact with piston
3) Suspend the holder from the balance just above the surface of a liquid
4) The liquid is raised until it touches the bottom of the porous sample
5) Mass vs. time is then collected as the liquid penetrates into the solid
Kruss K12 Surface Tensiometer
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Particle Size and Zeta Potential Analysis
1) No dilution required (0.1- 50% by volume )
2) Wide particle size range ( 5nm – 1000 microns)
3) Small sample volume (20-110 ml)
4) Use of ultrasound technologies
DT-1200 Acoustic Spectrometer
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Outline
Fundamental Structure-Property Relationship of Polyetheralkanolamine Copolymers
Optimization of PolyetheralkanolaminesStabilization mechanisms: steric and charge
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Effect of EO on Surface Tension
40
42
44
46
48
50
0 20 40 60 80
Moles of EO
4% solution
Surf
ace
tens
ion,
dyn
e/cm
P7E
P19EP41E
P58E
Increasing water solubility
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Effect of EO on Interfacial Tension
89
101112131415
0 20 40 60 80Moles of Ethylene Oxide
1% solution
Dispersed phase: Mineral OilFlow rate: 1ml/hr
Inte
rfac
ial T
ensi
on, d
yne/
cm
P19E
P41E
P58E
Increasing water solubility
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Effect of EO on Wetting Effectiveness for 4% Polymer Solutions on Carbon Black
200
400
600
800
1000
1200
0 20 40 60 80Moles EO
Wet
ting
Effe
ctiv
enes
s,
mg
Wetting effectiveness = max amount of liquid gained into the carbon black column
P7E
P19EP41E P58E
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Effect of EO on Wetting Rate for 4% Polymer Solutions on Carbon Black
1
2
3
4
5
0 20 40 60 80Moles of EO
Wet
ting
rate
, mg/
s
Wetting rate = (weight of liquid gain at half saturation) / (time required for half saturation)
P7E P19E
P41E P58E
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Effect of Ethylene Oxide on Carbon Black Dispersion Viscosity
10
100
1000
10000
0 20 40 60 80
Moles of EO
Visc
osity
@ 0
.8/s
, cP
P7E
P19E
P41E
P58E
(Highest wetting rate: dynamic)
37% Carbon Black ; 15% Dispersant on Carbon Black
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STERIC STABILIZATION:Adsorption Layer Thickness and Effective Volume Fraction
Eq. (1)
δ
δ = adsorption layer thickness (5-10 nm)
δ
3/2
3/5
s
nl=δ R
• Where n is the number of EO units, l is the EO length (0.369 nm), and s is the average distance between the grafting points (1.6 nm)
• The adsorbed polymer layer can increase the particle radius and add to the volume fraction of the solid particles, φ, to yield an effective volume fraction, φeff
3 effective /R) (1 δφφ += Eq. (3)
Reffective = R +δ Eq.(2) Reff
Rδ
Where δ is the adsorption layer thickness and R is the radius of the carbon black particles (24nm)
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Calculation of steric thickness and effective volume fraction
• Adsorbed layer thickness of 5-10 nm is usually considered sufficientto screen the attractive Van der Waals forces
EO content δ (nm) φ φ µ, cpeff
7 (P7E) 1.39 0.29 0.24
19 (P19E) 3.05 0.35 0.24
41 (P41E) 6.11 0.48 0.24 100
58 (P58E) 9.16 0.65 0.24 2,000
NP 40 * 2.3
Note: Length of each EO unit is about 0.35 nm. For 41 EO’s, the length is 14.35 nm, comparedto 6.11 nm. It is concluded that the EO chain may loosely coil at the solid/liquid interfacerather than extend straight into the water
∗ C. Ma, Colloids Surfaces, Vol 66, pg 215, 1992
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Zeta
Pot
entia
l, m
V
IEP
IEP
-6-4-202468
10
0 2 4 6 8 10 12 14pH
UntreatedWith P41E (15% onpigment)
IEPIEP
Zeta Potential of 5% Carbon Black as a Function of pH
CHARGE STABILIZATION
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Particle Size Distribution
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
PSD
, wei
ght b
asis
10-1 100 101 102
Diameter [um]
5% carbon black (untreated)Bimodal:
Size 1 0.523 micron
Standard deviation 1 0.12
Size 2 16.9 micron
Standard deviation 2 0.12
Fitting error % 18.2
Cumulative
10% 0.3637 micron
16% 0.3936 micron
50% 0.5971 micron
84% 16.5313 micron
90% 18.5258 micron
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0.0
0.4
0.8
1.2
1.6
2.0
PSD
, wei
ght b
asis
10-2 10-1 100
Diameter [um]
5% carbon black with 20% active P41E on pigment
UnimodalMedian 0.0924 micronStandard deviation 0.187Fitting error % 5.8Cumulative
10% 0.0551 micron16% 0.0621 micron50% 0.0924 micron84% 0.1392 micron90% 0.1549 micron
Particle Size Distribution
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y = 0.9167xR2 = 0.9975
0
50
100
150
200
250
0 50 100 150 200 250 300
Total Concentration, ppm
Ads
orbe
d C
once
ntra
tion,
ppm
Total Concentration vs. Adsorbed Concentration For P41E on Carbon Black
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Outline
Comparison with other conventional dispersants
Resin-containing pigment concentratesModified SMA : a styrene maleic anhydride modified with polyethersAcetylenic Diol surfactantP41E : Polyetheralkanolamine comb polymer
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Receding Contact Angle of Carbon Black Treated with Dispersants
30
40
60
70
80
90
Untreated Modified SMA P41E
Con
tact
Ang
le, D
egre
es
50
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05000
1000015000200002500030000
0 20 40 60 80
Acetylenic DiolP41EModified SMAPolyethermonoamine
P.B 15:3 Dispersion Viscosities 37% Pigment, 5.3% Dispersant on Pigment; P:B =4.7
Visc
osity
, cps
Brookfield RPM
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PY 14 Dispersion Viscosities36% Pigment, 5.2% Dispersant on Pigment, P:B =4.7
100
1000
10000
100000
0 20 40 60 80Brookfield RPM
Visc
osity
, cps
Acetylenic DiolP41EPolyethermonoamine
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100
1100
2100
3100
4100
5100
6100
0 10 20 30 40 50 60 70
Visc
osity
, cps
P41E
Modified SMA
Carbon Black Dispersion Viscosities38% Pigment, 5.3% Dispersant on Pigment; P:B =4.7
Brookfield RPM
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PR 57:1 Dispersion Viscosities36% Pigment Loading, P:B = 4.7
100300500700900
110013001500170019002100
0 10 20 30 40 50 60 70
RPM
Visc
osity
, cps
P41E (2.78% on pigment)
Acetylenic Diol (2.78% on pigment)
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Yellow dispersion viscosities- aged three weeks
1
10
100
1000
10000
100000
P41E Acetylenic Diol
InitialAged
Visc
osity
, cps
at 1
2 rp
m
unmeasurable
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Tint Strength: Blue Pigment (PB 15:3) in Interior Latex Extra White (1:99 TiO2 White Reduction)
100101102103104105106107108
Col
or S
tren
gth
P41E Acetylenic Diol MSMA
MSMA is reference (100%)
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Tint Strength : Carbon Black in Interior Latex Extra White (1:99 TiO2 White Reduction)
100
102
104
106
108
110
112
Col
or S
tren
gth
P41E MSMA Acetylenic Diol
Acetylenic Diol is reference (100%)
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Outline
Comparison with other conventional dispersants
Resin-free pigment concentratesModified SMA : a styrene maleic anhydride modified with polyethersP41E : Polyetheralkanolamine comb polymerStyrene Acrylate copolymer
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Note: Dispersion with a modified SMA was too thick to mill
Resin-free lithol rubine initial dispersion viscosity45% pigment loading, 10% P41 E on pigment
0
10
20
30
40
50
60
0 100 200 300 400 500 600 700
Shear rate, 1/s
Visc
osity
, cP
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Viscosity of Resin-Free Pigment Concentrate45% PB 15:3; 20% dispersant on pigment
02000400060008000
1000012000
0 20 40 60 80
RPM
Visc
osity
(cP) P41E
Styrene Acrylate
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0100200300400500600700800
Fresh One week at 50C
Visc
osity
@ 1
1/s,
cP
Styrene acrylateP41E
Viscosity of 30% carbon black resin-free dispersion: 20% dispersant on pigment
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Color Strength of Carbon Black in High Gloss Latex Acrylate Paint
102.8
113
100100
102
104
106
108
110
112
114
MSMA P41E Styrene acrylate
40% active oncarbon black
Col
or S
tren
gth
Resin-Free Carbon Black Concentrate: 30 % carbon black, 40% active dispersant on pigment
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Color Strength of Carbon Black in Semi Gloss Latex Acrylate Paint
100
115.6
56.6
0
20
40
60
80
100
120
MSMA P41E Untreated
30% active on carbon black
Resin-Free Carbon Black Concentrate: 30 % carbon black, 30% active dispersant on pigment
Col
or S
tren
gth,
%
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Color Strength of Carbon Black in Alkyd Resin Paint
100
128
91.2
0
20
40
60
80
100
120
140
Styrene acrylate P41E Untreated
40% active on carbon black
Col
or S
tren
gth
Resin-Free Carbon Black Concentrate: 30 % carbon black,40% active dispersant on pigment
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Gloss 60oAngle of Carbon Black in Alkyd Resin Paint
59
74.2
16.4
46.3
01020304050607080
MSMA P41E Styreneacrylate
Untreated
40% active on carbon black
Resin-Free Carbon Black Concentrate: 30 % carbon black, 40% active dispersant on pigment
Glo
ss
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Compatibility of P41E in Different Binder Systems
Binder system Compatibility
2 Pack Epoxy Good
Polyester resins Good
Alkyd resins Good
PU dispersions Good
Acrylic dispersions Good
Melamine resins Good
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Properties of lithol rubine containing various dispersants in semi gloss latex paint
Dispersant Dosage on ∆E Color Water lithol rubine strength resistance
P41E 10% 0.49 111.09 Good
MSMA 20% 2.20 110.59 Good
Styrene acrylate
20% 0.67 100 Good
P41E is two times more effective than other dispersants!
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Properties of lithol rubine containing various dispersants in high gloss paint
Dispersant Dosage ∆E Gloss Color Wateron blue strength resistance
P41E 10% 0.15 33.83 100.55 Good
MSMA 20% 0.27 30.2 101.48 Good
Styrene acrylate
20% 0.20 30.03 100 Good
P41E is two times more effective than other dispersants!
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Properties of lithol rubine containing various dispersants in alkyd resin semi gloss paint
P41E 10% 1.00 28.93 263.98 Excellent
MSMA 20% 5.07 26.2 100.00 Excellent
Styrene acrylate
20% 0.87 10.6 180.01 Excellent
Dispersant Dosage ∆E Gloss Color Wateron blue strength resistance
P41E is two times more effective than other dispersants!
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Properties of phthalo blue containing various dispersants in flat latex paint
Dispersant Dosage on ∆E Color Waterblue pigment strength resistance
P41E 20% 0.09 104.90 Good
Styrene acrylate
20% 0.47 100 Blisters
MSMA 20% 0.16 102.9 Good
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CONCLUSIONS
PolyetheralkanolamineP41E
Flexibility Production capacity Quality
-VOC-free - Reduced milling time - Better dispersion stability-APE-free - Decreased dispersion viscosity - Increased color development-Compatible with binder to allow higher pigment loading - Maximun color acceptancetypes of all bases
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Special Thanks To:
Judy PerezLisa Fine
Thank you for your kind attention!www.huntsman.com/cprEmail:[email protected]