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Primer surfacer for OEM finishes


Primer surfacer are very important for the long-lasting good appearance of automotive finishes. Polyurethane-based primer surfacers offer the best possible balance between elasticity (stone chip protection) and hardness (sandabilty), which are actually opposing properties. This property profile has made them a standard technology in Europe. Solventborne one-component polyurethane primer surfacers and similar waterborne systems are well established in the market.

Our product range for fillers
  • Waterborne polyurethane dispersions
  • Hydrophilized blocked polyisocyanates
  • Blocked polyisocyanates
  • Polyester-polyols
  • Self-crosslinking stoving coatings for one-component systems
  • Polyesters for melamine crosslinking systems
  • Self-crosslinking dispersions

Some raw matials for waterborne primer/surfacers (hydro fillers)

Polyurethane dispersions:

Type
Solids
in %
% OH
on solids
Viscosity
mPas
at 23°C
Characteristics
Bayhydrol®
E 270
Oil-free polyester
70
2.9
12000
In combination with waterborne amino resins for low co-solvent containing waterbased primer surfacers, good pigment wetting, good levelling
Bayhydrol®
U 241
Polyester-
polyurethane dispersion
41
2.5
1000
For waterborne primer surfacers, good flexibility and stone chip resistance

Polyisocyanate crosslinkers for waterbased dispersions:

Type
Solids
in %
% NCO
(blocked)
on solids
Viscosity
mPas
at 23°C
Characteristics
Bayhydur®
BL 2805 XP
W / HDI-
poly-isocyanate
39.5
4,0
blocked NCO,
on supply form
8000
In combination with Bayhydrol® polyols for of lightfast 1K polyurethane stoving coatings or as an additive for stoving systems, for improved elasticity, impact resistance and adhesion, good sandability
Bayhydur®
BL XP 2706
HDI-IPDI poly-isocyanate
42
8.6
600
In combination with Byhydrol® polyols for lightfast 1K stoving coatings, or as additive for stoving systems to improve hardness, impact resistance, chemical resistance and adhesion, co-solvent-free
Bayhydur®
BL 2781 XP
HDI-poly-isocyanate
38
9.7
blocked NCO,
on supply form
5500
In combination with Bayhydrol®- polyols for lightfast 1K polyurethane stoving coatings or as additive for stoving systems for improved elasticity, impact resistance and adhesion, good stone chip resistance

Self-crosslinking urethanes:

Type
Solids
in %
pH
Viscosity
mPas
at 23°C
Characteristics
Bayhytherm®
3146
Self-crosslinking
HDI-urethane
46
7.9
700
As binder for waterborne one-component stoving systems, high reactivity, no thermal yellowing
Bayhytherm®
2782 XP
Self-crosslinking
HDI-urethane
46
8.3
1000
Co-solvent-free version of Bayhytherm® 3146

Selection of starting formulations:

RR 4113One-component polyurethane hydro stoving filler (Bayhydrol® E 270/ Bayhydrol® U 241/ Bayhydur® BL 2805 XP)

RR 4115One-component polyurethane hydro stoving filler (Bayhydrol® E 270/ Bayhytherm® 3146)

Some raw materials for solventborne primer surfacers

Type
Solids in %
% NCO or OH
on solids
Viscosity
mPas 23°C
Characteristics
Desmodur®
BL 3175 SN
HDI-Polyisocyanate
75
14.8
blocked NCO,
on supply form
3300
For lightfast one-component systems or as an additive in conventional baking systems, enhances elasticity and adhesion
Desmodur®
BL 4265 SN
IPDI- Polyisocyanate
65
12.5
blocked NCO,
on supply form
11000
For one-component lightfast stoving systems, good sandability
Desmodur®
PL 340
60% BA/SN
IPDI- Polyisocyanate
60
12.2
blocked NCO,
on supply form
600
for lightfast one-component stoving systems
Desmodur®
PL 350
75% MPA/SN
HDI-
Polyisocyanate
75
14.0
blocked NCO,
on supply form
4300
In combination with polyol components for lightfast, one-component stoving systems
Desmophen®
T 1665 SN/IB
Saturated Polyester
65
2.6 OH
2700
In combination with amino- or crosslinking baking urethanes, good sandability, very good stone chip resistance
Desmophen®
670 BA
Polyester
80
3.4 OH
3000
For weatherable, elastic coatings, results in very cold-resistant and elastic films
Desmotherm®
2170
Self-crosslinking MDI-Urethane resin
69
-
2000
Aromatic, self-crosslinking stoving urethane resin, as binder for highly elastic reactive one-component stoving systems

Selection of suggested formulations:

RR 4104One-component polyurethane stoving filler
(Desmodur® BL 3175 / Desmophen® T 1665 SN/IB / Desmophen® 670)

RR 4105One-component polyurethane high solid – stoving filler
(Desmotherm® VP LS 2218 / Desmodur® BL 3175/ Desmophen® T 1665 / Desmophen® 670)

RR 4106One-component polyurethane stoving filler
(Desmodur® PL 340 / Desmodur® PL 350 / Desmophen® T 1665 SN/IB / Desmophen® 670)

RR 4123One-component polyurethane stoving filler (NT)
(Desmotherm® 2170 / Desmophen® T 1665 SN/IB)

Have a look at this detailed information:


Produktbroschüre Dispersionen
Dispersions - Products and Applications
Produktbroschüre - Isocyanate und Prepolymere
Polyisocyanates and Prepolymers: Products and Applications
Toolbox for waterborne 2K Polyurethane-Coating-Systems
Produktbroschüre Polyole und Aspartics
Resins - Polyols and Aspartics for reaction with Polyisocyanates

"Raw materials for one-component stoving coatings - OEM and Industrial"
"Blocked Polyisocyanates Examples of applications"



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