high performance acrylic dispersions for masonry and … · high performance acrylic dispersions...

High performance Acrylic Dispersions for Masonry and Wood Coatings

Harald Petri , Ulrich Désor , Dr. Matthias Junk

ASEFAPI, 5th November 2015 © Celanese

Agenda

► Polymer Dispersions – Basic Knowledge

► Homogeneous Acrylic Dispersions

► Advanced Polymerization Technologies

‒ Core/Shell -Technology

‒ New Gradual Composition (GC) –Technology from Celanese

► Application Test Results

► Summary

2 © Celanese High performance Acrylic Dispersions

Water Homogeneous Medium

Polymer Particle Heterogeneous Medium

Synonym

Polymer-Dispersion

Polymer Colloid

Latex

„Polymer-Emulsion“

What is a Polymer Emulsion ?

( in fact : Polymer Dispersion )

A polymer dispersion consists of very small polymer particles

distributed in the homogeneous phase water


Structure of a polymer particle

Colloidal Properties

Polymer Properties

A polymer particle is composed of a „polymer core“ and a

colloidal „shell“ which has a strong impact on workability

- chemical composition - glass transition temperature (Tg) - degree of crosslinking - molecular weight

- emulsifier, type, amount - number of sphere charges - number of charges in serum


5

Phase I Evaporation of water

Phase II Deformation of particles

Phase III Coalescence

Phase IV Interdiffusion of polymer chains

Proper film

formation only

occurs if ambient

temperature is

above MFFT !

Proper film formation needed to obtain a robust polymer film

© Celanese High performance Acrylic Dispersions

Film formation

The Minimum Film Formation Temperature ( MFFT ) is the lowest

temperature required to obtain a polymer film without any defects.

MFFT can vary from 0°C ( freezing water ) to 100°C ( boiling water )

! 6

Temperature Gradient

MFFT 0°C

18°C

>20°C

MFFT – Bench

0°C 20°C


Film formation Minimum Film Formation Temperature ( MFTT )

Plastic Coatings Masonry Coatings EWC

( Pure Acrylic ; Tg = 98°C ) ( Pure Acrylic ; Tg = 23°C ) ( Pure Acrylic ; Tg = -30°C )

Fibre Cement Coatings Masonry Coatings

( Pure Acrylic ; Tg = 48°C ) - low emission - ( Pure Acrylic; Tg = 6°C )

100 oC 25 oC -100 oC

stiff and briddle leather-like tacky

Polymer hardness Glass Transition Temperature ( Tg )

7

below Tg : Polymer chains like

uncooked Spaghetti ( rigid )

above Tg : Polymer chains like

cooked Spaghetti ( flexible )

Tg of Polymer Film


MFFT correlates with Tg in many cases, but is not the same.

Tg ≈ MFFT for hydrophobic polymers ( e.g. Styrene/Acrylic ).

MFFT can be lowered by adding suitable solvents and/or coalescing agents.

For hydrophilic polymers ( e.g. VAE ) water can act as coalescing agent ( Hydroplastification ).

Heterogeneous dispersions could have more than one Tg whereas every dispersions has only one MFFT.

MFF

T (°

C)

Tg (°C)

30

25

20

15

10

5

0

6 8 10 12 14 16 18 20 22 24 26 28 30 32 34

Styrene-Acrylic

VAE

Tg = MFFT

8

Correlation between MFFT and Tg


9

Lowering of MFFT by

adding suitable

coalescent agents

‘hard’

Dispersion

‘soft’

Dispersion Storage

Application

Production

Addition of

coalescent

agents

Hard Polymer Film

Soft Polymer Film

time

MFFT /Tg

[ °C ]

0

10

20

30

40

Drying typical ambient

temperature

Film Forming Process of homogenous

Polymer Dispersions ( „soft “ vs. „hard“ )

Evaporation of

coalescent

agents


Combining opposing properties

Film forming without any addition of

coalescent agents requires a “soft”

polymer dispersion and thereby a

relative soft polymer film hardness.

Low Glass Transition

Temperature (Tg)

To achieve a better polymer hard-

ness ( low blocking ) especially at

high temperatures “hard” polymer

dispersions are required.

High Glass Transition

Temperature (Tg)

Optimizing the balance between Soft Polymer Phase

( low Tg ) and Hard Polymer Phase ( high Tg ).

Soft phase enables the film forming at lower

temperatures and reduced demand of coalescing

agents whereas the high Tg phase improves film

hardness and block resistance.

Advanced Polymerization Technologies – Best of both worlds

10 © Celanese

?

High performance Acrylic Dispersions

Further optimization of the polymer

film properties

Cross-Cut Test

Improvement of adhesion on

critical substrates e.g. old alkyd

paints…

Improvement of durability e.g.

chemical resistance, stain

resistance …

11 © Celanese

Cross-linking Wet adhesion


Polymer Morphology

Low MFFT / Tg

- required to achieve a proper film

forming at low temperatures without

adding suitable coalescent agents.

High Tg

- for applications where a hard, no

blocking polymer film is required.

Cross-Linking

- improvement of mechanical and

chemical durability.

Wet adhesion

- optimized adhesion properties on

critical substrates.

Summary : Optimization tools

Monomer Composition Functionality

Advanced Polymer Dispersions

- high performance dispersion with

optimized balance between film formation

( MFFT ) and polymer hardness.


13

Mowilith® Homogeneous Acrylic Dispersions Product guide Masonry Coatings


LDM

7281

LDM

7709

LDM

7714

LDM

7719

LDM

7978

Nano

9420

Solids [ % ] 50 46 50 50 60 45

pH-Value 7,5 8,5 8,5 8,5 6,0 8,5

Viscosity [ mPas ] 2000 110 2000 4000 1500 55

MFFT [ °C ] ca. 13 ca. 1 ca. 15 ca. 0 ca. 0 ca. 6

Tg [ °C ] ca. 30 ca. 6 ca. 21 ca. 10 ca. - 30 ca. 18

Functionality ? no no yes yes yes no

Suggested

Applications

Exterior

Paints

Plasters

Textured

Coatings

Exterior

Paints

Plasters

Textured

Coatings

Masonry

Coatings

House

Paints

Concrete

Coatings

Masonry

Coatings

House

Paints

Elast Wall

Coatings

( EWC )

Nano

Hybrid

Paints

Binders based on homogeneous polymerization

14

Mowilith® Homogeneous Acrylic Dispersions Product guide Wood Coatings & Gloss Paints


LDM

7714

LDM

7719

LDM

7724

LDM

7774

Solids [ % ] 50 50 46 45

pH-Value 8,5 8,5 8,9 8,5

Viscosity [ mPas ] 2000 4000 7000 300

MFFT [ °C ] ca. 15 ca. 0 ca. 10 ca. 15

Tg [ °C ] ca. 21 ca. 10 ca. 23 ca. 25

Functionality ? yes yes yes yes

Suggested

Applications

Weather

protection

wood paints

Wood Stains

Weather

protection

wood paints

Wood Stains

Gloss / Trim

Paints

Wood Stains

Gloss / Trim

Paints

Binders based on homogeneous polymerization

© Celanese 15

Advanced Polymerization Technologies

How to combine opposed mechanical properties in one binder


Heterogeneous

Polymerization

Core-Shell

Particle

Particle with GC-

Technology

Celanese new Gradual Composition

( GC) - Technology

Core-Shell Particle Particle with GC Technology

16

► Defined phases of hard and soft parts

► Abrupt phase boundaries (breaking

point)

► Gradual change from hard to soft

polymer fraction

Two defined Tg

Temperature (°C)

Hea

t flow

(m

W)

broad Tg-range

Temperature (°C)

Hea

t flow

(m

W)


Advanced Polymerization Technologies Core-Shell vs. GC Technology

0

100

200

300

400

500

600

0

500

1000

1500

2000

2500

Homogeneous emulsion Heterogeneous emulsion

Elo

ng

ati

on

at

bre

ak

[ %

]

Blo

ck

ing

[ g

/6.5

cm

2 ]

50% MMA : 50 % BuA

phase 1: 20% MMA : 80 % BuA

phase 2: 80 % MMA : 20% BuA

phase 1 : phase 2 = 1 : 1

Tg2 = 80°C

Tg1 = -18°C

Tg =22°C

Blocking and Elongation of homogeneous and heterogeneous

dispersion with same total monomer ratio ( 50% MMA / 50% BuA )

Advanced Polymerization Technologies Impact of morphology

© Celanese High performance Acrylic Dispersions 17

( Core-Shell )

18

► Excellent balance between

blocking resistance and

elongation at break/elasticity

► Equipped with a broad

property profile to meet

market needs in gloss paints,

lacquers and trim paints area

0

20

40

60

80

100

0 1000 2000 3000El

on

gati

on

at

bre

ak (

%)

Blocking (50°C)

Dispersions with

GC-Technology

Core-Shell

Dispersions

LDM 7510

Advanced Polymerization Technologies New Gradual Composition (GC) - Technology

Mowilith® LDM 7510 is providing a unique balance between hardness

and elasticity enabled through the new GC-Technology


► Linear relation between blocking resistance

and elongation at break with different Core-

Shell-Grades

► Either good blocking resistance or good

elongation at break

19

Key advantages

► High gloss

► MFFT=0°C

► Styrene-free

► Excellent elasticity and at the same time highly

block resistant

► Excellent chemical and solvent resistance with

great wet adhesion (self crosslinking)

► Good outdoor durability – so far results are in line

with expectations

Advanced Polymerization Technologies New Gradual Composition (GC) - Technology

Mowilith® LDM 7510 : Unification of most important properties for

application in gloss paints, lacquers and trim paints


Gloss after 7 days of drying ( pigmented gloss paint – white )

20

54 53 54 50 54

77 77 78 78 78 78 82

107 104 98

0

20

40

60

80

100

120

Glo

ss u

nits

20° 60° Haze

sf = solvent-free formulation

sc = solvent-containing formulation

Application test results


Blocking after 1 day of drying at RT

(in white pigmented gloss paint)

Elongation at break after 28 days of

drying (in white pigmented gloss paint)

21

510

4500 5000 5000 5000

0

1000

2000

3000

4000

5000

6000

39 37

151

74

110

0

20

40

60

80

100

120

140

160

Drying: 1d at room temperature

Loading: 1 hour at 50 °C with 2kg/6,25 cm²



Mowilith® LDM 7510 : Excellent elongation at break / elasticity and at

the same time highly block resistant

Dry film resistance ( pigmented gloss paint – white )

22

Dispersion Recipe Scratch Alcohol Coffee

1d 7d

1d 7d 1d 7d 5 min 30 min 5 min 30 min

LDM 7510 sf L6045 FI 3 2 4 2 3 4 2 3

core/shell 1 sf L6045 FI 3 2 6 6 3 4 2 3

core/shell 2 sf L6045 FI 3 2 6 6 3 4 2 3

core/shell 3 sc L6003 FAI 4 2 2 2 1 2 1 2

homogeneous sc L6003 FAI 6 5 6 6 1 3 1 2

sf = solvent-free formulation

sc = solvent-containing formulation

Rating:

1: good

6: worse



Mowilith® LDM 7510 : Convincing dry film resistance performance,

even in solvent-free formulations

23

Mowilith® heterogeneous Acrylic Dispersions Product guide Wood Coatings & Gloss Paints


LDM

7411

LDM

7416

LDM

7451

LDM

7461

LDM

7510

Polymer

Morphology

Core Shell Core Shell Core Shell Core Shell Gradual

Composition

Solids [ % ] 50 50 47 46 48

pH-Value 8,5 8,5 8,5 7,5 8,5

Viscosity [ mPas ] 2500 2500 4500 1500 3250

MFFT [ °C ] ca. 1 ca. 0 ca. 8 ca. 24 ca. 0

Tg [ °C ] ca. -10 / 50 ca. -3 / 85 ca. 13 / 65 ca. 28 / 100 -

Functionality ? yes yes yes yes yes

Suggested

Applications

Wood

Stains

Gloss/Trim

Paints

Corrosion

Protection

Wood

Stains

Joinery

Coatings

Gloss/Trim

Paints

Wood

Stains

Furniture &

Parguet

Coatings

Gloss/Trim

Paints

( low VOC )

Summary

► Acrylic Dispersions are perfect alternatives to solvent-based binders to reduce the

VOC content of coatings while remaining the desired properties and application

performance.

► Acrylic Dispersions have a strong reputation regarding versatility, UV-resistance and

durability on various substrates including mineral, wood and metal.

► Mowilith® Acrylic Dispersions with homogeneous particle morphology enables the

formulation of high performance coatings with long term durability. Through the

further optimization of wet adhesion properties the coatings properties improved as

well, especially on wood.

► Mowilith® Acrylic Dispersions based on Core-Shell Technology offer excellent block

resistance in high gloss formulations at low pvc. Furthermore they provide excellent

properties in wood stain applications. ( e.g. early block resistance )

► Mowilith® LDM 7510 based on the new Gradual Composition (GC) - Technology

represents the next generation of Acrylic Dispersion with optimized and excellent

balance between high block resistance and elasticity. It’s the perfect binder for low

emission gloss paints and coatings applications in the professional and DIY segment.


25

Disclaimer

© 2015 Celanese or its affiliates. All rights reserved.

This publication was printed based on Celanese’s

present state of knowledge, and Celanese undertakes

no obligation to update it. Because conditions of

product use are outside Celanese’s control, Celanese

makes no warranties, express or implied, and assumes

no liability in connection with any use of this

information. Nothing herein is intended as a license to

operate under or a recommendation to infringe any

patents.

Celanese®, registered C-ball design and all other

trademarks herein with ®, TM, SM, unless otherwise

noted, are trademarks of Celanese or its affiliates.

Contact Information

Europe

Celanese

Industriepark Höchst

65926 Frankfurt am Main, Germany

[email protected]

celanese.com/emulsion-polymers


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