New hydrophobically modified acrylic technology to create cellulosics coatings rheology

21 Pages·2012·1.16 MB·English

New hydrophobically modified acrylic
technology to create cellulosics
coatings rheology
Pol Storme, Dow Coating Materials, Belgium
European Coatings WEB CONFERENCE
Novel additive developments
April 19, 2012
AGENDA
– Overview of rheology modifiers for emulsion paints
– Thickening mechanisms
– New HASE as cellulose ether alternative
–– CCoonncclluussiioonnss
© 2012 The Dow Chemical Company. All rights reserved
®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
COMMON RHEOLOGY MODIFIERS
FOR EMULSION PAINT
SYNTHETIC NATURAL DERIVATIVES
LL
AA
NN
OO •Alkali Soluble Emulsion
• Cellulose ethers
II
TT -ASE
NN • Other polysaccharides
EE -Acrylic type
VV
NN
OO
CC
E • Hydrophobically modified Alkali
V
Soluble Emulsion (HASE)
I
T • Hydrophobically modified
A • Non-Ionic Synthetic Associative
I cellulose ethers (HM cellulose
C
Thickeners
O ethers
S •Incl. Hydrophobically modified
S
A Ethylene oxide Urethane (HEUR)
C
I
P
O
•Titanium, Zirconium chelates •Clays
R
T
O
X
I
H
T
© 2012 The Dow Chemical Company. All rights reserved
®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
Overview of DCM Rheology Modifiers
According to chemistry
• Acrylic thickeners - ACRYSOL™ range
– Alkali-soluble emulsions (ASE)
– Hydrophobe modified alkali-soluble emulsions (HASE)
• Urethane thickeners ACRYSOL™ range
-
– Hydrophobically modified Ethylene oxide Urethane (HEUR)
• Cellulosic thickeners
– Hydroxyethyl cellulose (HEC) – CELLOSIZE™ range
– Hydroxyethyl Methyl cellulose (HEMC) – WALOCEL™ M range
– Carboxymethyl cellulose (CMC) - WALOCEL™ C range
© 2012 The Dow Chemical Company. All rights reserved
®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
Thickener Chemistry of focus
Cellulosic chemistry
Acrylic chemistry
© 2012 The Dow Chemical Company. All rights reserved
®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
Thickening mechanisms
Associative thickening Non-associative thickening
Thickener
Acrylic chemisty:
HASE ASE
Cellulosic chemistry:
HM cellulose ethers Cellulose ethers (HEC)
© 2012 The Dow Chemical Company. All rights reserved
®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
Need for cellulosics replacement by a HASE
• Ease of addition via liquid delivery
• Increasing speed of paint production avoiding a powder swelling step
• Avoid viscosity loss via enzyme resistance
• Reduce roller spatter with standard cellulosics
•• FFoorrmmuullaattiioonn ccoosstt bbeenneeffiittss ppoossssiibbllee
• Improve supply and availability situation
© 2012 The Dow Chemical Company. All rights reserved
®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
Development Concept
New HASE as cellulosic ether alternative
Cellulose
• HASE and ASE can each match
ether
some cellulosic ether properties
HASE ASE
New HASE
•• NNeeww HHAASSEE tteecchhnnoollooggyy ddeelliivveerrss
many of the positive attributes of
both HASE and ASE HASE ASE
New HASE
Cellulose
ether
• Result: Viable alternative to
cellulosic ethers
HASE ASE
© 2012 The Dow Chemical Company. All rights reserved
®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
Technical Requirements for cellulosics replacement
• Rheology
– High sag resistance
– High efficiency in flat-satin formulations
– Resistance to viscosity loss with colorant
– Resistance to viscosity loss on water dilution
– Roller pattern
–– ““aapppplliiccaattiioonn ffeeeell””
• Color
– Good color acceptance/color float
– Resistance to viscosity loss with colorant
• Dry-film properties
– Excellent water resistance
– Good scrub resistance
© 2012 The Dow Chemical Company. All rights reserved
®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow
New HASE : ACRYSOL™ DR-110 ER
Hydrophobically modified, alkali-soluble, emulsion-form thickener
alternative to cellulose ethers
(HASE) designed as an for latex
.
based paint thickening
Property Typical Values
Appearance Milky white emulsion
SSoolliiddss,, bbyy wweeiigghhtt,, %% 3300..00
Density (g/ml), wet 1.06
pH 4.3
Viscosity (Brookfield #2, 60 rpm), cps < 50
Stabilization Anionic
Storage precautions Protect from freezing

Properties are typical but do not constitute specifications
© 2012 The Dow Chemical Company. All rights reserved
®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow