Color-stable, fast-setting aliphatic Polyurea - PDA Europepda-europe.org/documents/7.KHW_Bayer.pdf · PDA Europe 2012 Annual Conference –Istanbul, 12-14 November Bayer MaterialScience

PDA Europe 2012 Annual Conference –Istanbul, 12-14 November

Bayer MaterialScience AG Karl H. Wuehrer

CAS Mkt/BD PICS PTFS AT CON

Color-stable, fast-setting

aliphatic Polyurea



aliphatic Polyurea

Target: Same type of coating but total aliphatic.



aliphatic Polyurea

Agenda:

- Challenges

- Products

- Tests

- Outlook



aliphatic Polyurea

Challenges

· No catalyst

· skull-crossbones free labeling

· correct mixing / design of the spray gun

· Sagging



aliphatic Polyurea

Challenges

· No catalyst

· skull-crossbones free labeling

· correct mixing / design of the spray gun

· Sagging

Aliphatic isos less reactive as aromatic isos.

Simple solution with catalyst, but stability issues.

Recently change in the labeling of known low viscose HDIs

Standard Fusion® gun do not deliver sufficient mixing

Due to the absence of DETDA no chemical thixotropy



aliphatic Polyurea

Products

· Amines

- Desmophen NH range

. Desmophen NH 1220 high reactive

100 mPa·s , 234 g/mol

. Desmophen NH 1420 medium reactive

900 mPa·s , 276 g/mol

- Chainextender

. Ethacure 90*

17 mPa·s , 142 g/mol

* Albermarle Corp.



aliphatic Polyurea

Products

· Isocyanates

- Desmodur N range

. Desmodur N 3800 HDI-based prepolymer

6000 mPa·s , 382 g/mol

. Desmophen N 3900 asymetric HDI-trimer

700 mPa·s , 179 g/mol

. Desmophen XP 2580 HDI-allophante

450 mPa·s , 215 g/mol

- Desmodur E range

. Desmodur VP LS 2371 IPDI-PET-prepolymer

11000 mPa·s , 1100 g/mol



aliphatic Polyurea

Products

· Anti-sagging

. HDK H2000 pyrogenic silica

Wacker Chemie AG

. Cab-O-Sil TS 720 fumed silica

Cabot Corp.

. Disparlon 6500, PA wax

Kusumoto Chemicals



aliphatic Polyurea

Products

· Filler

. Socal 312 N, calcium carbonate

Solvay Chemicals Int.

· Pigments

. Bayferrox 140 , ironoxid red

Lanxess AG.

. Ijmocolor RE, amin-based pigment paste

De Ijssel Coatings bv

. Nefa PUR A, amin-based pigment paste

Caparol Industrial Solutions GmbH



aliphatic Polyurea

Formulation

Formulation WKHB 255/2 – Composition of the components

Comp. A Desmophen NH 1220 46.5 p.b.w.

Desmophen NH 1420 16.8 p.b.w.

Ethacure 90 6.7 p.b.w.

Socal 312 23.3 p.b.w.

Ijmocolor RE paste 6.7 p.b.w.

100.0 p.b.w.

Viscosity @ 23°C 792 mPa·s


Comp. B Desmodur N 3800 50 p.b.w.

Desmodur XP 2580 50 p.b.w.

100.0 p.b.w.





aliphatic Polyurea

Formulation

Formulation WKHB 255/2 – data

Coating properities Pot life 2 min

Sagging see next page

Mechcanical

properties after

aging 7d @ RT

Tensile strength 10.6 N/mm²

Elongation 140 %

Tear propagation

resistance

23.7 N/mm

Taber abrasion H22

1000 cycles, 1 kg

310 mg

Spray conditions:

·Graco Reactor E-XP 2, 70°C , 170-190 bar



aliphatic Polyurea

Sagging

· Basic formulation:

→ sagging limit < 500 µm

· Cab-O-Sil TS 720, approx. 2%:

→ sagging limit < 1 mm

· Cab-O-Sil TS 720, 1.5% + Disparlon 6500, 1%:

→ sagging limit ≈ 1,5 mm

· HDK H 2000, 3% + Cab-O-Sil TS 720, 1%:

→ sagging limit ≈ 7 mm



aliphatic Polyurea

Mixing

· Fusion Gun (Air Purge Gun):

→ not proper mixing

· Conventional 2K spray gun with static mixer:

→ proper mixing,

but pot life issue



aliphatic Polyurea

Spray testing



aliphatic Polyurea

Spray testing



aliphatic Polyurea

Testing

· Adhesion on concrete

- without primer:

→ adhesion failure

- 2K EP primer*:

→ cohesion failure concrete

- MCU primer**:

→ cohesion failure concrete

- MCU primer with sand broadcasted:

→ adhesion failure PUA



aliphatic Polyurea

First results natural weathering

Industrial climate, roof Leverkusen

approx. 9 months

∆E approx. 2.5

no dirt pick up

no chalking



aliphatic Polyurea

Formulation

Formulation WKHB 255/2 – Composition of the components

Comp. A Desmophen NH 1220 46.5 p.b.w.

Desmophen NH 1420 16.8 p.b.w.

Ethacure 90 6.7 p.b.w.

Socal 312 23.3 p.b.w.

Ijmocolor RE paste 6.7 p.b.w.

100.0 p.b.w.



Comp. B Desmodur N 3800 50 p.b.w.

Desmodur XP 2580 50 p.b.w.

100.0 p.b.w.





aliphatic Polyurea

Modified formulations

Formulation WKHB 255/2 – Iso-modifications

Standard Trial-Iso 1 Trial-Iso 2

Comp. A Desmophen NH 1220 46.5 p.b.w. 46.5 p.b.w. 46.5 p.b.w.

Desmophen NH 1420 16.8 p.b.w. 16.8 p.b.w. 16.8 p.b.w.

Ethacure 90 6.7 p.b.w. 6.7 p.b.w. 6.7 p.b.w.

Socal 312 23.3 p.b.w. 23.3 p.b.w. 23.3 p.b.w.

Ijmocolor RE paste 6.7 p.b.w. 6.7 p.b.w. 6.7 p.b.w.

100.0 p.b.w. 100.0 p.b.w. 100.0 p.b.w.

Comp. B Desmodur N 3800 50 p.b.w. - -

Desmodur XP 2580 50 p.b.w. - -

Trial-Iso 1 - 100 p.b.w. -

Trial-Iso 2 - - 100 p.b.w.

Data Elongation 140 % 90 % 130 %

Tensile strength 11 N/mm² 20 N/mm² 18 N/mm²

Tear propagation resistance 24 N/mm 60 N/mm 70 N/mm



aliphatic Polyurea

Outlook

· Cooperation with an equipment manufacturer for

setting up a suitable spray gun

· Long time testing an evaluation of current

developed formulations

· Testing UV-stability under different climates

· Field trials

· Formulation modification to set up a kit of products



aliphatic Polyurea

Contribution:

- Mr. J. Weller, Spray Technology Group

Bayer MaterialScience AG, CAS EMEA/LA BD UV, Leverkusen, D

- F. Schade, Application Technology Construction

Bayer MaterialScience AG, CAS EMEA/LA BD PICS, Leverkusen, D

- Mr. D. Zielinski, Application Technology

Bayer MaterialScience LLC, CAS NAFTA BD PICS, Pittsburgh, USA



aliphatic Polyurea

Thank you for your attention

Contacts:

- Mr. Karl H. Wuehrer [email protected]

- Mrs. Zehra Butun, Bayer Turk Kimya San. Ltd. Sti [email protected]

or your local Bayer MaterialScience sales force www.bayercoatings.com

mailto:[email protected]

mailto:[email protected]

http://www.bayercoatings.com/

Documents

Color-stable, fast-setting aliphatic Polyurea - PDA Europepda-europe.org/documents/7.KHW_Bayer.pdf · PDA Europe 2012 Annual Conference –Istanbul, 12-14 November Bayer MaterialScience