emulson ag/tp1: acrylic polymer dispersant from lamberti
DESCRIPTION
Dispersant to disperse solid particles or liquid droplets in continuous phase. Multi ancor points leads to strong (irreversible) adsorption Building of steric barrier and behaviour of polyelectrolyte (electrostatic repulsion) Reducing viscosity Compatibility agent Milling aids: easy grinding Product can be used in aqueous dispersions (mainly aqueous suspension concentrate SC) or in preparation of slurry to be spray dried as dispersant or co-dispersant (in combination with other polymer and/or traditional surfactant) as milling aid High tolerance to extreme conditions of ionic strength and temperature.TRANSCRIPT
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EMULSON AG/TP1
THE AQUEOUS
CONCENTRATE OF ANIONIC
ACRYLIC COMPOUND
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Chemical Description
Aqueous dispersion (colloidal solution) of
anionic acrylic polymer
Copolymer of alkylmethacrylate and AMPS
Low molar content of hydrophobic monomer
(alkylmethacrylate)
Random distribution of structure units
Similar to comb-like (grafted) polymer
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Structure of AMPS
AMPS: Acrylamido-
methyl-propane
sulfonate
HN
O
SO3H
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Structure of Alkylmethacrylate
O
O
R
Alkyl
2-methyl-propenoic
ester
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Random Distribution of Three Linkages
Monomer A - Monomer A
Monomer A - Monomer B
Monomer B - Monomer B
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Structures
What’s the right
structure??
A polymer with idrophobic
and idrophilic groups
MeMe
OO
OO
OROR
NHRNHR
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Specification (properties incertificate of analysis)
Milky dispersion
pH (indiluted form):
5
Low viscous liquid:
<1000 mPa.s at 20 °C
using Brookfield
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Functions to be recognised
Dispersant to dispers solid particles or liquid
droplets in continuous phase
Multi ancor points leads to strong (irreversible)
adsorption
Building of steric barrier and behaviour of
polyelectrolyte (electrostatic repulsion)
Reducing viscosity
Compatibility agent
Milling aids: easy grinding
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Like Polyelectrolyte
Hydrophilic monomer
(AMPS) consists of sulfonic
group
High molar ratio of AMPS
provides high charge density
Sulfonic groups are neutralised (sodium salt);
full dissociation particularly in pH >7
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Dispersion – Colloidal Solution
Sulfonic groups (in AMPS monomers) improve
solubility of copolymer in water,
Alkyl chains (in methacrylate monomers) improve the
adsorption and accumulation at polar/apolar interface
Due to relatively high molecular weight of copolymer ,
solubility characteristics of monomers and molar ratio
the aqueous colloidal solution is being produced
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Application Product can be used in aqueous dispersions (mainly
aqueous suspension concentrate SC) or in preparation of
slurry to be spray dried
as dispersant or co-dispersant (in combination with
other polymer and/or traditional surfactant)
as milling aid
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Application and Guides for SC
Usually 2-5 % Emulson AG/TP1 gives desired results (regarding suspension stability, rheological
characteristics)
Good compatibility with other anionic coformulants (phosphates, sulfonates)
Good compatibility with non-ionic alkoxylates (ethoxylates, EO/PO adducts)
Good compatibility with xanthan gum
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SC Formulations of following Active Ingredients were examined obtaining
suitable results
Inorganic solid actives
Bordoeaux Mixture
Copper oxychloride
Sulfur
Organic solid actives
Diuron
Fluometuron
Bendiocarb
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Advantages
High tolerance to extreme conditions of ionic
strength and temperature
Ideal for solvent-free aqueous system including
SUSPENSIONS (slurries)
Usualy no wetting agent required
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Theta Conditions
Using NaCl (4M), CaCl2 (1M)and Na2SO4 (2M)
the salt tolerance is excellent: no flucculation,
precipitation occur
Heating up to 70 °C no flucculation and noincrease
in viscosity