A SUSTAINABLE APPROACH TO AUTOMOTIVE MODERN …patchamltd.com/.../2015/02/Automotive-Refinish-Coatings1.pdf · 2017-04-03 · A Sustainable Approach to Modern Coating Technology Patcham

AUTOMOTIVE REFINISH COATINGS

A SUSTAINABLE APPROACH TO

MODERN COATING TECHNOLOGY

A Sustainable Approach to Modern Coating Technology

Patcham FZC is a well-established manufacturer of specialty additives headquartered in the United Arab Emirates. Since its inception, Patcham has steadily grown into a leading supplier of specialty additives for the Paint & Coatings, Ink, PVC and Composite industries.

The company’s Pat-Add range of coating additives includes wetting & dispersing agents, defoamers, slip & leveling agents, rheology modifiers. Whilst keeping focus on environmental sustainability, the company produces products using green raw materials that are APEO free and have low or no VOC.

These products are multi functional and multi compatible, which simplifies the production process, reduces the chance of errors and minimizes inventory thus improving cost effective-ness.

Patcham has built a strong manufacturing and R&D infrastructure that enables the rapid transition from concept to products. The company has strategically located technical service laboratories, offices and representatives around the world to provide the most efficient customer service. In addition, a well-developed robust supply chain network enables it to deliver its products and services to customers around the globe with minimal lead-time.

w w w . p a t c h a m l t d . c o m

Contents

Introduction

Common issues and solutions for auto refinish systems

Performance of Pat-Add DA 1666 in auto refinish primers

Auto refinished base coats

High Molar Volume technology for resin minimal pigment

concentrates (Tinters)

Impact of HMV technology on pigment grinding

Multi Compatibility of HMV Technology

Ultra Charge Technology for superior performance

Pat-Add DA 1666 for effect pigment concentrates (Tinters)

Multi functional leveling additives for auto refinish systems

Pigment top coat / Clear coat system

Patcham's defoamer for auto refinish top coats and clear coats

Auto refinish system with Pat-Add additives

Body fillers and Putties


1

2

3

6

7

8

10

13

14

15

19

20

21

22

1

Figure 1: Sequence of coating process in auto-refinish systems

Introduction

The automotive refinish segment has been a key growing sector in the automotive paint industry for more than two decades. Paints and coatings developed for the automotive industry are also the most demanding in terms of quality and aesthetic value desired by the end use customers. The high expectations and demands of the end user drives the car manufacturers and body shop owners to maintain a uniformly high quality, so as to avoid any paint defects that would eventually add cost through rework.

Patcham additives provide the tools to meet the requirements of automotive industries in terms of paint quality and productivity. Patcham has a full range of additives that address all the stringent needs of refinish industries.

Refinish products Resin systems

Polyester putty, Body filler

Epoxy primer

2K PU primer surfacer

1K Primer surfacer

1K Basecoat

Solid pigment concentrates

Effect pigment concentrates

Clear coat

Unsaturated polyester

Epoxy

Acrylic polyol

Thermoplastic acrylic

Polyester : Cellulose acetate butyrate : Melamine formaldehyde

Polyester, Universal grinding resins

Polyester polyol, Acrylic polyol

Acrylic polyol

Table 1: Auto refinish product portfolio and resin system

Paint and resin systems in auto refinish industry.

w w w . p a t c h a m l t d . c o m 1


Common issues and solutions for auto refinish systems

2K epoxy primer

2K PU primer surfacer

Solid pigment concentrates

Effect pigment concentrates

Base coat binder

2K PU Clear coat

Substrate wetting, craters, cissing, drying, settling, medium separation, floatation, viscosity pick up, gelation

Pigment loading,colour development, transparency, long term stability, settling, medium separation etc.,

Pigment loading, anti settling, long term stability

Separation, dewetting, flocculation, floatation

Dewetting, orangepeel, popping, surface defects like craters, sagging etc.

Table 2: Paint systems, issues and Pat-Add solutions

Multipurpose additive for dispersing, anti settling, deflocculating additive and long term stability. Reduces surface tension, improves substrate wetting, leveling, eliminates surface defects like craters, cissing, and dewetting.

Improved flow, leveling, gloss and no intercoat adhesion issues.

Patcham's High Molar Volume technology can efficiently disperse and stabilize all kind of carbon blacks, organic pigments and inorganic pigments.

Dispersing and anti settling property for effect pigment concentrates.

Improves wetting over primer, avoid surface defects. Improves orientation of effect pigments

Better compatibility gives best DOI, good gloss, improves wetting, levelling, eliminates surface defects. No negative impact on intercoat or recoat adhesion.

Fluoro modified leveling agent, most efficient surface tension reducer

Improved flow, leveling, gloss, maintain good good adhesion and does not affect intercoat adhesion

Polymeric defoamer for low pigment or non pigmented systems. Maintains good intercoat adhesion

Pat-AddDA 1666

Pat-AddLE 1020

Pat-AddFL 7

Pat-AddDA 932; Pat-AddDA 3204

Pat-AddDA 1666

Pat-AddLE 1010, Pat-AddLE 1020

Pat-AddLE 1020

Pat-AddLE 1019

Pat-Add LE 1477

Pat-Add FL 7

0.5 - 1.0Millbase/Letdown

0.1 - 0.5Letdown stage


On SOP2.0 - 5.0

(Wetting/soaking stage)


0.1 - 0.5

0.05- 0.2Letdown stage



Pat-Add AF 62


Coats Common issues AdvantagesPatcham additives

Dossage on total paint formulation (%)

* SOP : Solid of additive on pigment

On SOP (Grinding stage)White pigment : 1-5Low structured carbon black: 30 to 50High structured carbon black : 50 to 120Inorganic pigments : 10-20Organic Blue /Green : 40-60Organic Red/Violet/Yellow : 30-70

*

*

2



Pat-Add DA 1666 is a multi-functional and multi-compatible additive that helps in :

Primer surfacers provide adhesion to subsequent coats and protect the substrate, along with filling of the dents or smoothening an uneven surface. The formulations for surface primer are based on various types of pigments, fillers and extenders. Higher extender loadings help formulators to get good corrosion resistance and improved sanding properties that are desired for good quality and faster repair. It also helps to reduce the formulation cost and operating cost. If these extenders are not sufficiently wetted and dispersed, they re-agglomerate and settle over a period of time leading to hard settling.

Figure 2: Multi-functionality and multi-compatibility of Pat-Add DA 1666

Wetting anddispersing

Acrylicresin

Epoxy

AlkydOthercombinationsof resins

Compatibilizer

Anti-settlingagent

Anti-saggingagent

Dispersing heavy pigments like oxides and extenders such as barytes and zinc phosphate with anti-settling and anti-sagging properties.

Achieving good compatibility in PU, Epoxy, TPA and other combination resins used in automotive coatings.

Formulating general industrial top coats and primers

3



Table 3: Formulation of Epoxy zinc phosphate primer

Raw materials Weight (%) Part AAcrylic polyol

Butyl acetate

Organo clay thickener

Pat-Add DA 1666

Zinc phosphate

China clay

Barytes

Titanium dioxide

Epoxy resin

1% Patcat 3001 (DBTDL)

Butyl acetate

Xylene Total

Part B

Polyisocyanate hardener

24.00

5.00

0.30

0.70

3.00

16.50

22.00

15.00

0.50

1.00

5.00

7.00

100.00

10.00

Table 4: Formulation of 2K PU primer surfacer

Raw materials Weight (%)

Pat-Add DA 1666 Reference

Figure 3: After 3 months stability at room stabiity

4

Advantages of Pat-Add DA 1666

Anti settling- Pat-Add DA 1666 gives better anti settling in high pigmented primers even after 1 week oven stability @ 50°c and 3 months stability at room temperature. Refer Figure 3.

Part AEpoxy resin

Pat-Add DA 1666

Organo clay thickener

Titanium dioxideZinc phosphate

Barytes

Talc

Solvent C9

Butyl Cellosolve

Total

Part B

Polyamide hardener

33.00

0.50

0.50

8.00

8.00

12.00

16.50

13.50

8.00

100.00

10.00



Figure 7: Pat-Add DA 1666 adhesion and flexibility test results

Figure 4: Representation of better anti-sagging property in 2K PU primer with Pat-Add DA 1666

Anti sagging - Pat-Add DA 1666 also gives better anti sagging in Epoxy, PU, Alkyd and other solventborne paints and applications. See Figure 4

Multi compatible - Pigment affinic groups for the various types of pigments present in co-grinding systems prevents agglomeration and subsequently lowers the risk of pigment floatation. Post addition of DA 1666 can also solve flocculation issues in co-grinding systems. See Figure 5

Floatation issue Pat-Add DA 1666

Figure 5: Pat-Add DA 1666 solvesflocculation issues in co-grinding systems

Reference Pat-Add DA 1666

Figure 6: Salt spray (400 hrs) results of primer made with Pat-Add DA 1666 vs reference

Adhesion test1MM X 1MM

Flexibility testConical mandrel

Multifunctional and multi-compatible - Ease of mixing with solventborne epoxy, PU and alkyd facilitates anti-sagging, anti-settling and no medium separation after long term storage stability of paints. Pigment affinic groups allow easy anchoring to the pigment surface and form a strong association thereby supporting anti-corrosion property of the final paint. This is shown in Figure 6.

Sagging limit

Reference Pat-Add DA 1666

Sagging limit

WFT inmicrons

75 µm

100 µm

125 µm

150 µm

175 µm

200 µm

225 µm

250 µm

275 µm

300 µm

5


Auto refinished base coats

Auto refinish basecoat colour formulations are provided in a database developed by the paint manufacturing companies for the automotive refinish market. Base coat for auto refinish is commonly divided into three categories:

• Solid base coat• Metallic base coat • Pearlescent base coat

The desired shade or colour is prepared in body shops on the spot by mixing base coat binder and pigment concentrates (also called as tinters) as per the color formulation. All the colorants, binders and primers are stored on tinting racks, as shown Figure 8.

The pigment concentrates are available in two types:

• Solid pigments - for solid basecoats• Effect pigments - for metallic for pearlescent basecoats

The basecoat provides color effects to the refinish system which is aided by an efficient dispersing and leveling agent that delivers the color and aesthetic appeal which attract customers.

Figure 8: Tinting rack for auto refinish coatings

Solid pigment concentrates Effect pigment concentrate

Figure 9: Types of pigment concentrates

Auto Refinish Tinting rack

6


High Molar Volume technology for resin minimal pigment concentrates (Tinters)

Patcham offers a range of additives for formulating solventborne solid and effect pigment concentrates.

Patcham’s innovative High Molar Volume technology is a specially designed polymer with a higher volume per mass as compared to conventional high molecular weight dispersing agents. Its higher volume results in a thicker adsorbed layer around the pigments which increases resistance to attractive forces and hence leads to more stable pigment dispersions. Multiple anchoring groups and multi compatible polymeric chains make it most suitable for high structured carbon black, organic pigments and various resin systems.

Key features of High Molar Volume technology:

Dense network of anchoring groups provide best wetting of pigments

Contributes to optimum mill base viscosity and reduced milling time

High jetness and blue under tone

Provides excellent long term stability of pigment dispersions

Superior gloss and transparency

Raw materials PW 6 PY 42 PB 15:3

Table 5: Guide formulation for resin minimal pigment concentrates based on Pat-Add DA 932

Laropal® A-81 solution

Pat-Add DA 932

Pigment

Fumed silica

MPA/Xylene

Letdown

Laropal A-81 solution

MPA/Xylene

Total

25.00

18.00

20.00

-

15.00

9.00

13.00

100.00

20.00

3.50

65.00

0.20

6.00

-

5.30

100.00

20.00

8.20

54.00

0.80

10.00

3.00

4.00

100.00

36.00

15.50

19.00

-

11.00

10.00

8.50

100.00

Figure 10: Consistency of the pigment concentrates after 3 months stability at room temperature

Special Black 4 PY 74 PW 6 PR 101FW 200PB 15:3

Special black 4

Pat-Add DA 932 – High Molar Volume technology

7

® ®

®

Save time

Save energy

Save $$$$



Current challenges in pigment grinding

Substantial energy and efforts are put in paint grinding process. This in turn has led to evolving better and efficient grinding machines and process technology to a certain extent. PATCHAM's HMV technology dispersing additives have proved to be helpful to save time, energy and cost for the customer.

Pigment loading - Making pigment concentrates with higher pigment loading and to get maximum performance in terms of colour development

Operating cost - Higher energy consumption and operating cost for grinding of pigments like high channel carbon blacks and organic pigments

Inventory hurdles - Multiple dispersing agents for carbon black, organic and inorganic pigments, multiple set of colorants for multiple resin systems

Stability – Hard settling, viscosity pick up, poor compatibility, flow and color development

Advantages of HMV technology in pigment grinding

Faster wetting mechanism for pigments with different morphologies

Optimum mill base viscosity enables higher pigment loading

Optimum mill base viscosity gives desired shear and flow properties

Less efforts for ginding reduces energy consumption

Reduced inventory, ease of processing and reduction in energy consumption contributes to lesser operating cost and increased profit.

8



Direct grinding of FW 200 carbon black optimum millbase viscosity and reduces grinding with Pat-Add DA 932 provides time

Influence of HMV technology on jetness and blue under tone

Figure 13: Higher jetness and bluer undertone with Pat-Add DA 932 vs reference in direct grinding formulations

Figure 14: Influence on jetness with time for Pat-Add DA 932 vs reference sample in direct grinding formulations

Figure 12: Fineness of paint vs grinding timeFigure 11: Viscosity of paint vs grinding time

FOG

, µm

Pat-Add DA 932 Reference25

20

15

10

5

030min 60min 90min 120min 180min

Pat-Add DA 932 Reference350300250200150100500

Initial 30min 60min 90min 120min 180min

Mass tone of 2K PU black vs reference in various grinding times

30 min

DA 932

DA 932

1 hour 90 min 120 min 180 min

Ref DA 932 RefRef DA

932 RefDA 932 Ref

290

285

280

275

270

265

260

Mc values of samples in various grinding time

Mc

valu

es

Initi

al

Afte

r

Initi

al


Afte

r

Initi

al

Afte

r

Initi

al

Afte

r

Initi

al

Afte

r

NB: Higher Mc values indicates higher jetness NB: Positive dM values indicates bluer undertone

dM v

alue

s

dM values of samples in various grinding time

5

4

3

2

1

0

-1

-2

-3

-4

Initi

al

Afte

r

Initi

al

Afte

r

Initi

al

Afte

r

Initi

al

Afte

r

Initi

al

Afte

r

30 min 60 min 90 min 120 min 180 min30 min 60 min 90 min 120 min 180 min


®

Visc

osity

in c

P

9


Multi Compatibility of HMV Technology

Table 8: Direct grinding of FW 200 carbon black in thermoplastic resin (TPA) with and without CAB

Figure 15: Color development and gloss of FW 200 black dispersion in TPA with/without CAB

Pat-Add DA 932 Ref-1 Ref-2 Ref-3

Mill base With CAB

W/O CAB

With CAB

W/O CAB

With CAB

W/O CAB

With CAB

W/O CAB

Thermoplastic resin (TPA)

Organic clay

Dispersant

Pigment FW 200

TPA solvent (XYL/MEK/EA)

Letdown

Thermoplastic resin (TPA)

Pat-Add LE 1020

CAB 381-0.5 (25% Sol in BA)

TPA solvent (XYL/MEK/EA)

Total

Raw materials

®

®

®

Pat-Add DA 932 Ref - 1 Ref - 2 Ref - 3

Gloss of direct grinding of FW 200 black in TPA with CAB

8070605040302010

0


Color development of FW 200 black in TPA with CAB

2.5

2

1.5

1

0.5

0

L* b*

30.00

0.50

1.80

2.00

15.00

30.30

0.20

5.00

15.20

100.00

30.00

0.50

1.80

2.00

15.00

30.30

0.00

0.00

20.20

100.00

30.00

0.50

2.82

2.00

15.00

30.30

0.20

5.00

14.18

100.00

30.00

0.50

2.82

2.00

15.00

30.30

0.00

0.00

19.18

100.00

30.00

0.50

1.83

2.00

15.00

30.30

0.20

5.00

15.17

100.00

30.00

0.50

1.83

2.00

15.00

30.30

0.00

0.00

20.17

100.00

30.00

0.50

1.62

2.00

15.00

30.30

0.20

5.00

15.38

100.00

30.00

0.50

1.62

2.00

15.00

30.30

0.00

0.00

20.38

100.00

10

®

®

CIE

lab

valu

esG

loss

val

ue

20° 60°


Multi compatibility of HMV technology

Table 9: Direct grinding of FW 200 in 2K PU system

Table 10: Direct grinding of PB 15:3 in 2K PU system

Results of direct grinding of FW 200 in 2K PU system

Acrylic polyol

Organic clay

Dispersant

Pigment FW 200

PU solvent

Letdown

Acrylic polyol

Pat-Add LE 1020

Patcat 3001 (1% Sol)

PU solvent

Total

Pat-Add DA 932

20.00

1.50

1.80

2.00

10.00

49.23

0.20

0.20

15.07

100.00

20.00

1.50

2.83

2.00

10.00

49.23

0.20

0.20

14.04

100.00

20.00

1.50

1.84

2.00

10.00

49.23

0.20

0.20

15.03

100.00

20.00

1.50

2.12

2.00

10.00

49.23

0.20

0.20

14.75

100.00

Acrylic polyol

Dispersant

PB 15:3

PU solvent

Letdown

Acrylic polyol

Pat-Add LE 1020

Patcat 3001 (1% Sol)

PU solvent

Total

Ref-1 Ref-2 Ref-3

12.00

2.87

4.50

10.00

57.23

0.30

0.20

12.90

100.00

12.00

4.50

4.50

10.00

57.23

0.30

0.20

11.27

100.00

12.00

2.93

4.50

10.00

57.23

0.30

0.20

12.84

100.00

12.00

3.37

4.50

10.00

57.23

0.30

0.20

12.40

100.00

Ref-1 Ref-2 Ref-3

Pat-Add DA 932

Raw materials

Raw materials

®

®

®

Figure 17: Color development of FW 200 black dispersion in 2K PU

®

L* and b* value of pigment FW 200 in 2K PU

L* b*

1.5

1

0.5

0

-0.5


Color and transparency of PB 15:3 in 2K PU

25

20

15

10

5

0


b* Transparency

Figure 16: Color and transperancy of PB 15:3 in 2K PU

11

®


Multi compatibility of HMV technology

Performance in organic pigments formulations

Raw materials

Laropal A-81 solution

Pat-Add DA 2650

Dispersant

Pigment

Aerosil

MPA/Xylene

Laropal® A-81 solution

MPA/Xylene

Total

27.00

0.50

15.50

10.00

-

20.35

6.30

20.35

100.00

27.00

0.50

24.28

10.00

-

20.35

6.30

11.57

100.00

27.00

0.50

15.83

10.00

-

20.35

6.30

20.02

100.00

27.00

0.50

14.00

10.00

-

20.35

6.30

21.85

100.00

36.37

0.50

15.40

19.00

-

10.74

9.39

8.60

100.00

36.37

0.50

24.00

19.00

-

10.74

9.39

0.00

100.00

36.37

0.50

15.70

19.00

-

10.74

9.39

8.30

100.00

36.37

0.50

13.90

19.00

-

10.74

9.39

10.10

100.00

RMPC Black FW 200 RMPC Blue PB 15:3

DA 932 Ref 1 Ref 2 Ref 3 DA 932 Ref 1 Ref 2 Ref 3

Transparency of RMPC blue PB 15:3

Ref - 1 Pat-Add DA 932 Ref - 2 Ref - 3

35

30

25

20

15

10

5

0Acrylic polyol Epoxy TPA

®

b* value of FW 200


0.80.70.60.50.40.30.20.1

0-0.1-0.2-0.3

Acrylic polyol Epoxy TPA

L* value of FW 200


1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0Acrylic polyol Epoxy TPA

Figure 18: Color development in acrylic, epoxy and TPA resin system

®

® ®

12

Table 11: Resin minimal pigment concentrate formulations

Figure 19: Bluer undertone of FW 200 RMPC letdown in acrylic, epoxy and TPA

Figure 20: Transparency of PB 15:3 RMPC let down in acrylic, epoxy and TPA resin

Tran

sper

ancy

, �E

L v

alue

s

b va

lues

*

*


Advanced version of High Molar Volume technology. i.e. Ultra Charge Technology (UCT) for developing high performance resin free or resin minimal pigment concentrates used in high end or premium quality automotive OEM and refinish coatings, where superior jetness and transparency is required.

Key features of Ultra Charge High Molar Volume technology:

Pat-Add DA 3204 – Ultra Charge technology

Multiple poles of charges provide good adhesion of anchoring groups on the pigment surface

Strong anchoring to pigments with various geometry and porosity like organic, inorganic and difficult to grind carbon blacks

Minimal risk of desorption: Chances of desorption under adverse conditions only, such as strong diluted dispersions, strong solvents, inert pigments

® ®®

13

309

301

277

304

290

270

Raven 5000 Monarch 1300 FW200

Pat-Add DA 3204 Reference A

Performance of Pat-Add DA 3204 in High structured carbon blacks

Performance of Pat-Add DA 3204 in difficult to grind organic red and violetReduce risk of desorption and losing protection under adverse conditions, such as strong-diluted dispersions, strong solvents, inert pigments

Figure 22: Transparency of organic red and violet pigments in 2K PU direct grind system

Figure 21: Jetness improvement in popular high structue carbon blacks in 2K PU direct grind system

Ultra Charge Technology for superior performance

PR 122

Pat - Add DA 3204 Reference

PV 23

Pat - Add DA 3204 Reference


Pat-Add DA 1666 for effect pigment concentrates (Tinters)

Pat-Add DA 1666 for effect pigment concentrate

Pat-Add for effect pigment concentrates

Pat-Add DA 1666 plays an important role in the preparation of effect pigment concentrates. It acts as wetting, dispersing, stabilizing and anti-settling agent. These characteristics help to impart excellent long term stability to the effect pigments. Pat-Add DA 1666 is unique in being able to stabilize different types of pigments and extenders, with excellent anti-settling, anti-sagging properties. It also acts as a compatibilizer to resolve floatation and flocculation issues. Owing to the multi functional properties of Pat-Add DA 1666 the additive can replace several conventional additives in the formulation and help reduce inventory with potential cost saving.

CAB 381.20 solution in BA (20%)

Polyamide wax solution (10%)

Polyester polyol

Melamine formaldehyde

Plasticizer

Pat-Add LE 1020

Xylene

Butyl acetate

Total

Basecoat clear binder

Raw materials Weight (%)

Raw materials Weight (%) Raw materials Weight (%)

50.00

10.00

10.001.50

1.50

0.20

19.80

7.00

100.00

Polyester polyol

Pearlescent effect pigment

Pat-Add DA 1666

Organo clay thickner (5%)

Xylene

Total

50.20

28.00

0.80

17.00

4.00

100.00

Pearlescent pigment concentratePearlescent pigment concentrate

Table 6: Pearl pigment concentrate Table 7: Colour formulation

Base coat binder

Pearlescent pigment concentrate

Resin minimal pigment concentrate based on Pat-Add DA 932

Total

88.812.31

8.88

100.00

Guide formulations

14



Figure 23: Advantages of Patcham surface modifiers

Best compatibility

Figure 24: Compatibility in epoxy and PU resin (0.3% additive in resin)

Pat-Add LE 1019 Reference Pat-Add LE 1019 Reference

Compatibility in epoxy resin Compatibility in acrylic resin

Multi compatible

Most effective surface tension reduction

Improved substrate wetting

Leveling and wet look

Best anti-cratering and eliminates surface defects

Improved slip properties

Improved orientation of effect pigments

No adverse impact on intercoat, recoat adhesion

Minimal foam stabilization

15



10

20

30

40

50

Blank 0.3% Pat-Add LE 1010

0.3% Pat-Add LE 1020



0.3% Pat-Add FL7

mN

/m

Improved flow, leveling and gloss

Pat-Add LE 1020 allows for surface tension reduction, improved substrate wetting and compatibility with different resins and helps with good flow, leveling, DOI and gloss of a coating.

Figure 29: Excellent gloss and DOI with Pat-Add leveling agents

16

Pat -Add LE 1477 Reference ReferencePat-Add FL 7

Surface tension reduction with Pat-Add surface modifiers

Surface tension (mN/m) 0.3% surface modifier in butyl acetate

Figure 27: Water contact angle of paint film made with Fluoro modified leveling agent

Figure 28: Water contact angle of paint film made with Polymeric leveling agent

Figure 26: Water contact angle of paint film made with Polysiloxane leveling agent

Figure 25: Surface tension (mN/m) of 0.3% surface modifier in butyl acetate

ReferencePat-Add LE 1020

Pat-Add surface modifiers efficiently reduce the surface tension of the coating to achieve excellent and smooth surfaces. The surface tension of the liquid paint with Pat-Add LEs are measured and recorded in Table. Water contact angle on the paint film shows higher contact angle for Pat-Add LEs than the reference samples. This implies that Patcham surface modifiers efficiently reduce the surface tension and hence the surface energy of the coatings. Higher value of water contact angle provides more water repellency and high performance to the coatings.



Improved orientation of effect pigments

Figure 30: Pat-Add LE 1020 influence on orientation of effect pigments (pour out test for base coat on transparent PVC sheets)

Figure 31: Pat-Add LE 1019, SL 1120 influence on orientation of various effect pigments

2K PU clear without additvie

2K PU clear with 0.3% Pat-Add LE 1019 Pat-Add SL- 1120 Effect pigments

Copper pigments

Aluminium pigments

Matting agents

17

The influence of Pat-Add leveling additives on the orientation of effect pigment is best explained by observing the surface tension changes in the drying of the film upon adding the leveling agent. If the leveling agent is not present there is a surface tension difference between the top & bottom layers of the coating film upon solvent evaporation, causing pigments & matting agent to be swirled around, leading to Benard Cell formation. Reducing the surface tension of the paint film to a point, such that the difference between the uppermost & the innermost layers of the coating film is not too drastic, results in a more uniform surface tension across the film and hence a more uniform layered effect pigment with less defects like mottling, spiking etc.

ReferencePat-Add LE 1020



No negative impact of polysiloxane based leveling agents onintercoat / recoat adhesion

No negative impact of fluoro modified leveling agents onintercoat / recoat adhesion

System of application: Substrate - Polypropylene1K Conductive primer with Pat-Add DA 932Base coat with Pat-Add LE 1020Clear coat with Pat-Add LE 10202 x 2 Adhesion of silver base coat +2K PU clear system

Figure 31: Intercoat adhesion of metallic base coat

Figure 32 : Intercoat adhesion of 2K PU Top coat system

Figure 33: Superior slip performance of Pat-Add SL 1120

0.29

0.28

0.27

0.26

0.25

0.24

0.23

0.22

Pat-Add SL 1120 Reference

Coefficient of friction

Pat-Add LE 1477 Reference

Non sanded Non sanded

Sanded Sanded0.2% 0.5% 1% 0.2% 0.5% 1%

Passes

Passes

Passes

Passes

Passes

Passes

Passes

Passes

Passes

Inferior

Inferior

Passes

18

Improved slip properties with Pat-Add SL 1120


Pigment top coat / Clear coat system

Substrate wetting, wetting of base over primer and clear coat over base coat

Flow and leveling and enhanced the wet look

Eliminate surface defects like craters, cissing, orange peel etc.

Provide excellent slip and mar resistance

No adverse effects such as intercoat or recoat adhesion

Good polishability

Patcham's LE series are a set of multi functional additives, with the following features:

Some of the best performing surface modifiers with the above characteristics for Auto refinish top coats and clear coats are:

Pat-Add LE 1020 - Solvent based surface modifier for effective surface tension reduction, improved substrate wetting and leveling along with slip properties

Pat-Add LE 1019 - Unique solvent free surface modifier suitable for solventborne, solvent free and waterborne formulations and provides dynamic surface tension reduction at very low dosage.

Pat-Add LE 1070 - Polymeric, silicon free leveling agent improving flow and leveling without any side effects. Helps to reduce short waves in clear and pigmented top coats. Gives best results when combined with other polysiloxane based leveling additives

Pat-Add FL 7 - Polymeric, silicon free polymeric leveling agent for best balance of flow, leveling and sag without any side effects on intercoat adhesion

Pat-Add SL 1120 - Gives superior slip performance and improves mar resistance

Pat-Add LE 1477 - Fluoro modified polyacrylate polymer, most efficient surface tension reducer, effective anti cratering additive suitable for plastic coatings and automotive coatings as well. It gives superior performance in surface tension reduction, anti cratering, leveling and wet look It has no adverse impact on intercoat/recoat adhesion of the paint film.

19


Pat-Add LE 1020 - Solvent based surface modifier for effective surface tension reduction, improved substrate wetting and leveling along with slip properties

Pat-Add LE 1019 - Unique solvent free surface modifier suitable for solventborne, solvent free and waterborne formulations and provides dynamic surface tension reduction at very low dosage.

Pat-Add LE 1070 - Polymeric, silicon free leveling agent improving flow and leveling without any side effects. Helps to reduce short waves in clear and pigmented top coats. Gives best results when combined with other polysiloxane based leveling additives

Pat-Add FL 7 - Polymeric, silicon free polymeric leveling agent for best balance of flow, leveling and sag without any side effects on intercoat adhesion

Pat-Add SL 1120 - Gives superior slip performance and improves mar resistance

Pat-Add LE 1477 - Fluoro modified polyacrylate polymer, most efficient surface tension reducer, effective anti cratering additive suitable for plastic coatings and automotive coatings as well. It gives superior performance in surface tension reduction, anti cratering, leveling and wet look It has no adverse impact on intercoat/recoat adhesion of the paint film.

Raw materials Quantity (%)

Patcham's defoamer for auto refinish top coats and clear coats

Pat-Add AF 62 is a silicone free defoamer with fast defoaming properties. It supports level-ing additives in avoiding film defects by destroying the foam generated in mixing, filling at the manufacturer's end. It helps to eliminate errors during the filling in terms of erroneous volumes. It also destroys the foam generated during atomization of paint during spraying and also it supports faster deaeration of foam from the wet film.

Figure 34 : Ease of incorporation with no adverse impact in final film properties

Figure 35: Ladderized study of defoamer in 2K PU clear

Table 12: 2K PU clar coat formulation

2K PU clear coat

Part A

Acrylic polyol

Pat-Add LE 1019

Pat-Add LE 1070

Hindered amine light stabilizers

UV absorber

1% Patcat 3001 (DBTDL)

Pat-Add AF 62

PU solvent (BA : Xylene: MPA) (1:1:1)

Total

Part B

Aliphatic polyisocyanate

60.00

0.10

0.40

0.20

0.40

2.00

0.05

36.85

100.00

28.00

Glo

ss @

20

Deg

90888684828078

Blank 0.025 0.05 0.1 0.4

82

8887 87

88

Ladderized study in 2K PU clear

Dosage of Pat-ADD AF 62 in 2K PU clear (%)

Actual appearance after spray Adhesion test Flexibility test cone manorel

20

No adverse effect on gloss and clarity


Substrate:- Plastic (ABS)Cleaned and wiped with IPA

Coat -1 Primer surfacer -- Air drying for 2 hrsCoat -2 Blue base coat -- Flash off 10 minCoat -3 2K PU clear coat -- Air drying overnight

Figure 36: Demo car painted with auto refinish system

Primed with primer surfacer

2K PU clear coat withPat-Add LE 1020 and Pat-Add AF 621K base coat blue with

Pat-Add DA 1666 and Pat-Add LE 1020

21

Auto refinish system with Pat-Add additives


Body fillers and Putties

Repairing dents with Body fillers and Putties

Pat-Add DA 816, Pat-Add DA 1666 work as good wetting agents for such formulations. Pat-Add Rheol 253 gives the required rheology to the putty so that upon mixing with hardener and during application on a vertical substrate, unwanted side effects such as dripping and sagging can be avoided.For severe dents body filler is applied to fill the dent to make the surface even flat and ready for putty application. After the body filler application is complete, the putty is applied over it to seal and level the dent.Once the putty is dry and sanded, normal surfacer and base coat clear coat can be followed as per the desired colour.

Figure 37 : Putty application and sanding

Table 13: Guide formulation body filler and putty

Raw materials Body filler Putty

Unsaturated polyester resin

Organo clay

Styrene monomer

Fumed silica

Pat-Add DA 1666

Titanium dioxide

Micronised talc

Calcium magnesium carbonate

Calcium carbonate 240 mesh

Barium sulfate

Microspheres

Pat-Add Rheol 253

Total

32.00

0.00

3.70

0.30

0.50

3.00

25.00

0.00

24.00

7.00

4.00

0.50

100.00

39.00

0.50

2.70

0.30

0.50

3.00

30.00

15.00

8.50

0.00

0.00

0.50

100.00

22


Repairing dents with Body fillers and Putties

Pat-Add DA 816, Pat-Add DA 1666 work as good wetting agents for such formulations. Pat-Add Rheol 253 gives the required rheology to the putty so that upon mixing with hardener and during application on a vertical substrate, unwanted side effects such as dripping and sagging can be avoided.For severe dents body filler is applied to fill the dent to make the surface even flat and ready for putty application. After the body filler application is complete, the putty is applied over it to seal and level the dent.Once the putty is dry and sanded, normal surfacer and base coat clear coat can be followed as per the desired colour.

Notes


Notes

w w w . p a t c h a m l t d . c o m 17w w w . p a t c h a m l t d . c o m

www.patchamltd.com

PATCHAM (FZC)

P.O. Box: 7753,Saif Zone, Sharjah, UAETel: +971-6-5570035Fax: +971-6-5570038Email: [email protected]

PATCHAM EUROPE BV

Klavermaten 65-1 7472 DD GoorNetherlandsEmail: [email protected]

PATCHAM INDIA

B-52, Pravasi Industrial Estate Vishweshwar Nagar, Off Aarey Road Goregoan (E), Mumbai - 400 063 (India) Tel: +91-22-29272471Email: [email protected]

PATCHAM USA LLC

10 Commerce RoadFairfield, New Jersey – 07004Tel: (201) 293-4282Fax: (201) 820-0818Email: [email protected]

The information given in this booklet is intended for technical guidance without obligation. Ver. 1.0

Documents

A SUSTAINABLE APPROACH TO AUTOMOTIVE MODERN …patchamltd.com/.../2015/02/Automotive-Refinish-Coatings1.pdf · 2017-04-03 · A Sustainable Approach to Modern Coating Technology Patcham