Transcript Coalescents in LA

Coalescent evaluation
Agenda
 Legislation
 Coalescents in LA
 Evaluation
 Results
 Discussion
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Legislation
 LA
• Only Mexico has standards for VOC, but it is not in place.
 Brazil
• Standards are under discussion in Brazilian Coatings
Manufacturing Association (ABRAFATI).
» Dow is participating on this discussion.
• It may be aligned with Europe standards.
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Coalescents in LA
 DALPAD E:
• Glycol ethers blend.
• It is known.
 Texanol / Nexcoat / UCAR Filmer IBT
• It is well known / Commodity.
• It works.
 ULTRASOLVE P240
• E serie glycol ether (DOWANOL EPh)
• Local producer (Oxiteno)
 DALPAD C (DOWANOL TPnB) and COASOL:
New !
• No VOC under Europe guidelines.
• DALPAD C has been sampled for few customers.
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Critical Customers Requirements
 Good Cost / Benefit balance.
 “Read to use”:
• Customers are not willing to make many evaluations
neither changing their formulations to the new coalescent.
• It is difficult to get their formulations to optimize coalescent
using at Dow’s facility.
 Low environmental impact:
• no VOC.
• Low odor.
• Renewal source.
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Evaluation
 Design of Experiments
• Latex: Dow Latex 3433 (SA).
• Concentrations: 0.5, 1, 2, 3 and 5%.
Coalescents:
• DALPAD E, DALPAD C, DOWANOL DPnB, COASOL and
Texanol.
Tests:
• MFFT, Scrub resistance, Drying time, Brookfield viscosity.
• Neat latex and samples.
• Triplicate analyzes.
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MFFT / Lowest temperature is
expected
18.0
16.0
MFFT (°C)
14.0
COASOL
12.0
DOWANOL DPnB
10.0
DALPAD C
8.0
DALPAD E
6.0
Texanol
4.0
2.0
0.0
0
1
2
3
4
5
Coalescent conc (%)
 Coasol: was the most effective coalescent to decrease MFFT, for
1, 2 and 3 %
• MFFT = 4°C: 2% Coasol or 5% DALPAD C
 DALPAD E, DOWANOL DPnB and Texanol had intermediate
performance.
 DALPAD C was not good.
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Scrub resistance / biggest # cycles is expected
Scrub resistance (cycles)
2500.0
2000.0
COASOL
1500.0
DOWANOL DPnB
DALPAD C
DALPAD E
1000.0
Texanol
500.0
0.0
0
1
2
3
4
5
Coale sce nt conc (%)
 It is variable result test.
 COASOL and Texanol had a good performance.
 DALPAD C was not good “again”.
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Drying time / shorter time is
expected
35.0
Drying time (min)
30.0
Coas ol
25.0
DPnB
20.0
DALPAD C
15.0
DALPAD E
10.0
Texanol
5.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Coalescent conc (%)
 Any significant difference was detected.
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Brookfield visco / shorter visco is expected
Brookfield Viscosity (cPs)
1800.0
1600.0
1400.0
Coasol
1200.0
DPnB
1000.0
DALPAD C
800.0
DALPAD E
600.0
Texanol
400.0
200.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Coalescent Conc (%)
 All coalescents were until 2 and 3%.
 By adding 5% of COASOL and Texanol visco increased too much
(comparing to the sample without coalescent.
• It is no exactly a problem because customers will not add 5% of
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coalescent.
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Results summary
 MFFT
• Coasol had good performance and the best, comparing to
other studied coalescents.
 Scrub resistance
• Coasol and Texanol were the best options.
 Drying time
• Any coalescent point out.
 Brookfield viscosity
• Any coalescent point out.
» Except for highest studied concentrations (5%).
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Next steps
 Validate these results with other emulsions systems.
 Evaluation blends of COASOL with other coalescents
(DOWANOL PPh, DOWANOL DPnB, DOWANOL TPnB,
etc.) in order to look for better cost / benefit balance.
 Evaluate commercial and logistics aspects
• Cost / Price for LA.
• Availability.
• Etc.
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