dicarboxylic acids and dialcohols. - abrafati 2019
TRANSCRIPT
An unsaturated polyester is a macromoleculebuilt by a polycondensation reaction fromdicarboxylic acids and dialcohols.
Double Bond
Polyester
Monomer(Styrene)
OO
OHOH
O
O
Polycondensation reaction:
H2O
Dicarboxylicacid
Dialcohol
Unsaturated Polyester
An unsaturated polyester resin is a solution ofthe unsaturated polyester in a low viscositymonomer (styrene)
Unsaturated Polyester Resin
Curing process:
TMPDE TECHNOLOGY
• TMPDE ( TRIMETYLPROPANE DI-ALLYL ETHER ) is used especially for
increasing the glossy property in polyester coatings and also it is used in
order to improve the surface hardness. TMPDE works as a chain stopper
to improve oxidative drying properties and direct gloss.Incorporating
allylethers into the coatings system also increases the production rate and
your productivity.Resins cure faster with a higher content of allylether up
to a certain level, the normal range being 15-35% by weight.
• A higher TMPDE level ( 30-40% by weight on total resin ) allows to achieve
a good reactivity, sufficient to formulate “Styrene Free” products.
TMPDE TECHNOLOGY
• Chemistry
Free Radical,(cure by Co metal +Mek peroxyde)
-UPE MODIFIED ALLYLIC : CH2 O CH2 CH=CH2
CH3CH2C CH2 OH
CH2 O CH2 CH=CH2
A) SYNTEVEN : standard Styrene grade
B) SYNTEVEN : “Styrene free” systems
Low viscosity(0,75 mPa*s)
High availability
Good solvent and reactive monomer
Good perfomance of the final product
Flammable
Very hazardous in case di eye contact
Hazardous in case of skincontact, of ingestion, ofinhalation
Possible cancirogenfor humans!
STYRENE
Low price
“STYRENE FREE”
• METHACRYLATE GROUP LOW
IRRITATION
T0 REPLACE STYRENE
METHACRYLATE TECHNOLOGY
• HEMA Hydroxyethylmethacrylate
• HPMA Hydroxypropylmethacrylate
• PEG200DMA Polyethylenglycoldimethacrylate
HEMAGHS –LABELLING
Symbol(s)
Signal word : warning
Hazard statement :
H317-May cause
allergic skin reaction.
H319-Causes serious
eye irritation.
HPMAGHS –LABELLING
Symbol(s)
Signal word : warning
Hazard statement :
H317-May cause
allergic skin reaction.
H320-Causes eye
irritation.
PEG200DMANot a dangerous
substance or mixture
according to the
Globally Harmonized
System(GHS).
Classification
according to Directive
67/548/EEC or
1999/EC : Indication of
danger
Not dangerous
Galstaff MultiresineUnsaturated polyester resin sty free for redox system
Synteven 713 100% SOLID CONTENT
Synteven 704 80% Butyl Acetate
Synteven 728 AE 80% Ethyl Acetate
Synteven 462 2AB 75% Butyl Acetate
Plasticising resin:
Galstaff Multiresine SpA 13
STYRENE FREE:
•GOOD REACTIVITY •GOOD ADHESION ANDGOOD RESISTANCES
•NO SMELL•LONG GEL TIME•HIGH HARDNESS•HIGH GLOSSY PROPERTY
STYRENE:
• LOW COST• GOOD REACTIVITY•GOOD ADHESION AND GOOD RESISTANCES
•SHORT GEL TIME•STRONG SMELL •GOOD FLEXIBILITY
WORKABILITY DIFFERENCE
0%
20%
40%
60%
80%
100%
0 1 2 3 4 5 6 7 8 9
wo
rka
bil
ity
Working Time (hours)
styrene free
styrene
YELLOWING RESISTANCE
• QUV TEST(600 HOURS, by UV lamps type UV–A340):
To note that the QUV test has given the presence of
a little of yellowing, not in exposure part but in dark
room, typical phenomenon in UPE technology. It is
caused both from radical reaction with Co and Mek
Peroxide and from some inhibitor or stabilizer
additivies contained in the resins and monomers. In
spite of this it has been noted that the styrene free
yellowing it is a little bit lower than styrene, as
follow :
YELLOWING RESISTANCE
1. Δb in styrene system: 0.7
2. Δb in styrene free system: 0.5
Comparative chart
Standard product Sty free
Sandability
Wetting properties
Film hardness ++
Air release
Cold check
HARDNESS BY ERICHSON PENCIL
(MOD.318)
0
1
2
3
4
5
6
7
Styrene Styrene free 2K,PU
NW
HARDNESS
SANDING SEALER PROPERTY
Styrene : good after 18-24 hours fromapplication
Styrene free : good after 5-7 hours fromapplication
CONCLUSIONS
1. STYRENE FREE : it is based on synergist react
between the allylic polyester and
methacrylate monomer to replace styrene.
2. STYRENE FREE : it offers longer gel time and
no smell. Better safety and lower irritation.
3. STYRENE FREE : it offers better
performances in terms of sanding time
property as sanding sealer and better
hardness film when applied as top coat.
CONCLUSIONS4. STYRENE FREE : persist some yellowing in
dark room, but lower than std styrene.
5. In addition we can offer some detailed
formulation of ready warnish and
enamels,very accurated in terms of
composition and evaluation of the
performances.
Head Office:
via Stazione, 90 - 21020 Mornago - VA - ITALY
Ph: +39 0331 9014.52 Fax: +39 0331 904777
E-mail: [email protected]
Web: www.galstaffmultiresine.com
THANK YOU FOR
YOUR
ATTENTION