The Effect of Secondary Diamine Content in Spray Polyurea Coatings

November 29, 2001

Polyurea Development AssociationOrlando, Florida

Ray Scott, John Leon

UOP LLC

1 2 3 4

A-SideRubinate 9480 (%) 100.00 100.00 100.00 100.00

% NCO 15.4 15.4 15.4 15.4Index 105 105 105 105

B-SideJEFFAMINE D-2000 (%) 65.68 62.55 57.65 52.02JEFFAMINE T-5000 (%) 5.57 5.06 5.17 5.33

Unilink 4200 (%) 0.00 8.1 18.6 29.85 DETDA (%) 28.76 24.29 18.6 12.79

Volume Ratio (A:B) 1.000 1.000 1.000 1.000

Formulations for the Effect of Unilink 4200on Sprayed Polyurethane Coatings

Proportioner: Gusmer H-20/35Spray gun: Gusmer GX-7 Series 400Pressure - 2000psi; Temperature - 160F

Secondary Amine

NH H

N

Effect of Percent Unilink 4200 on Gel and Tack FreeTimes

0

10

20

30

40

50

Gel

and

Tac

k Fr

ee T

imes

, se

c

0 8.1 18.6 29.85

Percent Unilink 4200

Gel TimeTack Free

Rubinate 9480, D-2000, T-5000, DETDA, and Unilink 4200

Effect of Percent Unilink 4200 on Hardness

0

10

20

30

40

50

60H

ardn

ess,

Sho

re D

0 8.1 18.6 29.85

Percent Unilink 4200

InstantAfter 10 sec

Rubinate 9480, D-2000, T-5000, DETDA, and Unilink 4200

Effect of Percent Unilink 4200 on Modulus and Tensile Strength

0

1000

2000

3000

Mod

ulus

, Ten

sile

, psi

0 8.1 18.6 29.9

100 Modulus

300 Modulus

Tensile

Unilink 4200, %

1025-1028 Series: Rubinate 9495, D-2000, T-5000, DETDA, and Unilink 4200

Effect of Percent Unilink 4200 on Elongation

0100200300400500600700800

Elon

gatio

n, %

0 8.1 18.6 29.85

Percent Unilink 4200

Rubinate 9480, D-2000, T-5000, DETDA, and Unilink 4200

Effect of Percent Unilink 4200 on Tear Strength

0100200300400500600700800

Tear

Str

engt

h, p

li

0 8.1 18.6 29.85

Percent Unilink 4200

Rubinate 9480, D-2000, T-5000, DETDA, and Unilink 4200

Effect of Percent Unilink 4200 on Load Bearing

0

10

20

30Lo

ad B

earin

g, p

si

0 8.1 18.6 29.85

Percent Unilink 4200

Rubinate 9480, D-2000, T-5000, DETDA, and Unilink 4200

Summary

In general, increasing Unilink 4200 in this polyureaformulation retards gel time, increases elongation, withlittle effect on tensile, and a small loss of tear strength.

What is the #1 reason for using Unilink 4200 in spraypolyurea coating systems?

Comments From an EXPERT Applicator

After Spraying a System With 30 php Unilink 4200

“I would love to have material like this to use for all of our spray demonstrations”

Tom Rivera, Gusmer Corporation

“I always knew that some systems had an additive in them that made it easier tospray…now I know what it is!”

Robert Crawford, Glas-Craft INC.

Spray Pattern

Substrate Benefits

Surface Quality

Equipment Benefits

Polymer Properties

Spray Pattern

Smaller droplet size

Better spray pattern

Less “fingering” and “roping”

Better coverage

Lower mix viscosity

Substrate Benefits

Better wetting and flow

Better substrate adhesion

Better inter-coat adhesion

Less de-lamination

Longer “open” time between multiple coats

Surface QualityLess orange peel effect

Better flow-out

Better self-leveling

Less shrinkage

Reduced spray lines especially at the tie-in pass

Better surface quality especially on vertical surfaces

Equipment BenefitsLonger gel times

Less build-up on gun tip

Less nozzle plugging

Improved mechanical mixing

More forgiving at lower temperatures and pressures

Less change in physical properties with fluctuations in temperature and pressure

Higher productivity with less down time

Greater control on thickness

Polymer PropertiesControlled gel times

More flexibility

Better cold temperature properties

Less shrinkage

Lower water absorption

Higher impact resistance

Better abrasion resistance

Better chip resistance

More forgiving to formulation change and index

50,000 ft2 concrete coating application generic primer ($30/gal)

Polyurea spray elastomer system @ 50 mils with 15% loss ($35/gal)

Only power wash surface preparation required

Polyurea system cost $1.25 / ft2

Application cost $0.25 / ft2

Power washing costs $0.21 / ft2

Priming $0.40 / ft2

Equipment depreciation $0.10 / ft2

Total $2.21 / ft2

Job size Multiplier 1.10

Minimum Total Cost $2.43 / ft2

Courtesy of Primeaux Associates LLC

Polyurea spray elastomer system @ 60 mils ($35/gal)

18.6% Unilink 4200 in B-Side Resin blend

Minimum Total Cost ($2.43 / ft2)

Unilink 4200 Costs Just $0.05 /ft2

Polyurea system cost $1.25 / ft2

Save 3 mils thickness Pays for 15 php Unilink(Due to improved application control)

Application cost $0.25 / ft2

Save 5 hours over the project Pays for 15 php Unilink(Due to improved productivity)

Power washing costs $0.21 / ft2

Priming $0.40 / ft2

Equipment depreciation $0.10 / ft2

Total $2.21 / ft2

Job size multiplier 1.10

Minimum Total Cost $2.43 / ft2

AcknowledgementDr. Jerry Reddinger of Huntsman Corp.

for the Unilink 4200 level study and polyurea data

Dudley Primeaux of Primeaux Associates LLCfor Cost Estimating Data and helpful suggestions

Dr. David House of UOP LLCfor physical testing and collaboration