CN9030: Acrylic Oligomer For UV/EB Corrosion Resistant and Weatherable Coatings

Benefits:

  • Corrosion resistance
  • Weatherability
  • Toughness, i.e., combined flexibility and strength
  • Adhesion to a variety of substrates
  • Chemical resistance

Target Markets:

  • Metal and plastic coatings
  • Litho, flexo, screen, and inkjet inks
  • Laminating adhesives
  • Electronics

Additional Information:

Description:

CN9030 is a new difunctional aliphatic urethane acrylate oligomer designed for highend UV/EB-cure coating applications - especially coatings for metal surfaces where resistance to yellowing and corrosion are required. CN9030 demonstrates adhesion to challenging substrates, including metals and plastics, and produces films that are strong and flexible. In addition, CN9030 is resistant to harsh chemicals, such as methyl ethyl ketone (MEK) and concentrated NaOH.

 

Typical physical properties for CN9030 are presented in Table 1.

Table 1. CN9030 Typical Physical Properties

Property Typical Value
Appearance Clear Liquid
Color, APHA 45
Density, g/cm3 1.12
Refractive index @25° C  1.483
Tensile strenght, psi1  4,500
1% Modulus, psi1 38,000 
Elongation, %1  125
Tg, peak of Loss Modulus, °C1  23
Tg, peak of Tan Delta, °C1  66
Viscosity, cP @ 60° C 22,000

 

1. Cured film properties:
Formulation: 96% CN9030 and 4% Esacure KT046 (Lamberti, SpA)
Film thickness: 5-6 mil.
Cure parameters: 50 ft/min under (2) 300 W/in Hg lamps in air.
Energy: 1440 mJ/cm2

Adhesion:

The formulation in Table 2 was used to examine crosshatch adhesion (ASTM

D3359) of CN9030 on a variety of substrates.

Table 2. Adhesion Study Base Formulation

Component Quantity (wt. %)
Oligomer2 75
SR238 (hexanediol diacrylate)2 15
CD9053 (acid functional monomer)2 5
Darocur® 11733 5

 

2. Sartomer USA, LLC.

3. Darocur is a registered trademark of BASF.

Figure 1 compares CN9030 crosshatch adhesion performance with that of typical

epoxy and polyester acrylate oligomers on a variety of substrates, including

aluminum, cold-rolled steel, tin-plated steel, and PET. CN9030 significantly

outperforms each oligomer on all substrates.

 

Figure 1. ASTM D3359 Crosshatch Adhesion on Various Substrates Showing Percent Adhered Coating After Tape Removal

 

 

4. Study based on Table 2 formulation.

Film thickness: 0.5 mils

Cure parameters: 100 ft/min under two 300 W/in Hg lamps in air.

Test protocol: Crosshatch adhesion –  ASTM D3359

Corrosion Resistance:

Figure 2 illustrates corrosion resistance of CN9030 versus BPADGE diacrylate

oligomer (epoxy acrylate). Both specimens were exposed to a continuous 21-day,

35° C salt spray based on ASTM B117. Corrosion of the cold rolled steel was

considerably more severe with the epoxy acrylate coating than with the CN9030

coating.

Figure 2. Salt Fog Testing (ASTM B117) of an Industry Standard Epoxy Acrylate Versus CN9030 on Cold-Rolled Steel

The above results illustrate the baseline for an expansive study for which a link is

provided below. Although the study is beyond the scope of this newsletter, Figure 3

shows that a CN9030-based coating can be optimized to provide superior corrosion

resistance - a result not attained with the epoxy control.

 

Figure 3. Salt Fog Test Results Based on Optimized CN9030 Coating Per Study

Weatherability:

Sartomer's CN9001 is an aliphatic urethane oligomer that has shown exceptional

performance after seven years of Florida exposure and is used as an internal

standard for weathering.

 

Figure 4, which plots yellowness index against twelve months of Florida exposure,

shows that CN9030 exhibits very good yellowing resistance and is comparable to

CN9001.

 

Figure 4. Yellowness Index (ASTM E313) for CN9030 Versus CN9001 Based on 12 Months of Florida Exposure

5. Formulation: 97% oligomer; 3% TPO

Film thickness: 1.5 mils

 

Cure parameters: 
25 ft/min under one 600 W/in "V" lamp in air and then

25 ft/min under one 600 W/in "H" lamp in nitrogen

 

Test protocol: Yellowness index – ASTM E313

 

Figure 5 shows the impact of 12 months of Florida exposure on gloss for the two

products. Again, CN9030 shows excellent gloss retention and results that are similar

to CN9001.

 

Figure 5. Percent Loss of 60° Gloss (ASTM D523) for CN9030 Versus CN9001 Based on 12 Months of Florida Exposure

6. Formulation: 97% oligomer, 3% TPO

Film thickness: 1.5 mils

Cure parameters:

25 ft/min under one 600 W/in "V" lamp in air and then

25 ft/min under one 600 W/in "H" lamp in nitrogen

 

Test protocol: 60° Gloss – ASTM D523

*The listed properties are illustrative only, and not product specifications. Sartomer USA, LLC disclaims any liability in connection with the use of the information, and does not warrant against infringement by reason of the use of its products in connection with other materials or in any process.

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