Raw Materials for Automotive Refinish Systems
Desmodur®/Desmophen®Bayhydrol®/Bayhydur®
Roskydal®
This brochure provides information on automotive refinishing as •coating build-up
•development of 2K PUR systems •VOC legislation
•chemical and physical aspects •coating raw material data and application properties
Raw Materials for Automotive Refinish Systems
Desmodur ®/Desmophen ®–Bayhydrol ®/Bayhydur ®–Roskydal ®Bayer MaterialScience AG markets the product ranges Desmodur ®/Desmophen ®,Bayhydrol ®/Bayhydur ®and Roskydal ®.
Bayer MaterialScience AG – one of the world’s leading producers of coating raw
materials – therefore possesses a comprehensive portfolio of high-grade building blocks for polyurethane coating systems.
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1.Introduction Page 4
-Historical development of car refinish systems
-Reasons for the success of 2K-PUR in car refinish
-Chemistry of 2K polyurethane systems
2.VOC compliant systems Page 6
-VOC-legislation for car refinish in europe
-Bayer MaterialScience VOC compliant raw materials for car refinish
3.Desmodur®polyisocyanate hardeners Page 7
-Aliphatic polyisocyanate hardeners for 2K-PUR coatings
-HDI-Biuret hardeners
-HDI-Isocyanurate hardeners
-IPDI-based hardeners
-Low viscous HDI-based hardeners
-Reactivity of different aliphatic polyisocyanate hardeners
-Functionality versus viscosity for different HDI based hardeners
4.Desmophen®polyols and reactive diluents Page 12
-Polyols for primers, surfacers, top and clearcoats
-Applications and properties
-Relationship between drying and VOC-value
-Reactive diluents for very high solids
5.Bayhydrol®/Bayhydur®for waterborne systems Page 16
-Waterborne 2K-PUR systems
-Polyols for waterborne 2K-PUR systems
-Hydrophilic polyisocyanates
-Polyisocyanates for waterborne 2K-PUR systems
New technologies for car refinish systems Page 19
6.Roskydal®unsaturated putty-polyesters Page 20
-Unsaturated polyesters for refinish & marble putties
-Unsaturated polyesters for spray & industrial putties
31. Introduction
Driven by Technology: • Film Quality • Optical Properties • Efficiency
4Chemistry of 2K polyurethane systems
52. VOC compliant systems
1) VOC= Volatile Organic Compounds
2) VHS= Very High Solids: VOC ≤ 250 g/l
3) HS= High Solids: VOC ≤ 420 g/l
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*also in butyl acetate
MPA –methoxy propyl acetate X –xylene
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3. Desmodur ®polyisocyanate hardeners
HDI-Biuret hardeners
HDI-Isocyanurate hardeners
*also in BA – butyl acetate, SN–solvent naphta 100
Desmodur®N3790, N 3300, N 3390 and N 3600 are all TSCA listed
n=number of monomeric units incorporated
Trimer
Pentamer
Heptamer
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HDI-Trimer IPDI-Trimer
T g –glass temperature
approx. –
60° C approx. +60° C
Viscosity 3,000 mPas solid (2,000 mPas at 70 % in SN*)
IPDI-Trimers have:
a significant faster physical drying also secondary NCO groups
lower reactivity a significant higher viscosity
higher VOC
compromise:
use of IPDI hardeners in combination with HDI-based hardeners
use of lower viscous IPDI allophanate Desmodur ®XP 2565
G G
G
G
G
9
IPDI-based hardeners
SN – solvent naphta 100
MPA –methoxy propyl acetate X – xylene
SN –solvent naphta 100BA
– butyl acetate
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*100% version of Desmodur®N3790, not commercial available
114. Desmophen®polyols and reactive diluents
BA–butyl acetate
X–xylene
MPA– methoxy propyl acetate
SN 100– solvent naphta 100
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*=in combination with other resins
134.Desmophen®polyols and reactive diluents
14Reactive diluents for very high solids
BA–butyl acetate
155. Bayhydrol®/Bayhydur®for waterborne systems
Polyols for waterborne 2K-PUR systems
PES:Polyester,PAC: Polyacrylate, *: % on solids, °: % on supply form
DMEA– dimethyl ethanolamin
BG– butylglycol
PnB– propylenglycol butyl ether
SN 100– solvent naphta 100
16Hydrophilic polyisocyanates
17Polyisocyanates for waterborne 2K PUR systems Hydrophilic types Bayhydur®Hydrophobic, low viscous types Desmodur®
MPA– methoxy propyl acetate
X– xylene
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New technologies for car refinish systems
1based on Desmophen®A/Desmodur®N
2based on Bayhydrol®/Bayhydur®/Desmodur®
3based on Desmophen®NH reactive diluents/Desmodur®N
4Bayer MaterialScience products under development.
For further information please contact our Technical Service.
196. Roskydal®unsaturated putty-polyesters
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Technical Service Contacts
Europe, Middle East, Africa:
Car Refinish Systems:
Jörg Schmitz
+49-214-30-57054
Holger Mundstock
+49-214-30-55578
Michael Ehlers
+49-214-30-573
Waterborne Systems:
Martin Melchiors
+49-214-30-52435
NAFTA:
Car Refinish Systems:
Scott Grace
+1-412-777-7657
Dave Zielinski
+1-412-777-7652
South America:
Car Refinish Systems:
Alberto Hassessian
+50-11-5694-5148
Asia:
Car Refinish Systems:
Osamu Kirihara
+81-6-97-2166
22If you have any questions
regarding the technical details
presented in this brochure,
please contact us at:
info@bayercoatings.com
Additional information is available on the Internet at:
www.bayercoatings.com
23This information and our technical advice – whether verbal, in writing or by way of trials – are given in good faith but without warranty, and this also applies where proprietary rights of third parties are involved. Our advice does not release you from the obligation to verify the information currently provided – especially that contained in our safety data and technical information sheets – and to test our products as to their suitability for the intended processes
and uses. The application, use and processing of our pro-ducts and the products manufactured by you on the basis of our technical advice are beyond our control and, therefore, entirely your own responsibility. Our products are sold in accordance with the current version of our General Conditions of Sale and Delivery.
Edition: 2005-02-MH
Printed in Germany · E
Bayer MaterialScience AG Coatings, Adhesives & Sealants 51368 Leverkusen
Germany
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