WB PIGMENT CONCENTRATES A SUSTAINABLE APPROACH TO MODERN COATING TECHNOLOGY

Transcription

1 A SUSTAINABLE APPOACH TO MODEN COATING TECHNOLOGY WB PIGMENT CONCENTATES

2 A Sustainable Approach to Modern Coating Technology Patcham FZC is a wellestablished 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 PatAdd 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 effectiveness. Patcham has built a strong manufacturing and &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 welldeveloped robust supply chain network enables it to deliver its products and services to customers around the globe with minimal leadtime.

3 Introduction Pigment concentrates generally refers to any pigment dispersion used as tinting pastes or full mixing systems. Pigment concentrates contain high loading of pigments dispersed with or without a dispersing resin. Stainers, tinters, colorants, shading pastes are some of the alternate terms used. The advantages of pigment concentrates Faster delivery Lowers cost of production of small batches Immediate availability for a wide color spectrum educed cost of storage Simplify paint production with higher reproducibility equirements of a pigment concentrate Compatibility with a wide range of coating systems Good storage stability at the highest possible pigment level Color stable, no change in gloss, no haze, transparency, no flooding/floating No syneresis or settling Optimum rheology for computerized dispensing systems Easy incorporation, low shear should be sufficient for optimum dispersing

4 Patcham dispersing and wetting agents in focus The role of wetting agent is to gradually reduce the interfacial surface tension as a result of which the air entrapped on the pigment surface is replaced by the medium. This results in effective wetting of the pigment. Pigment wetting & dispersion During the wetting step, air and moisture occurring on the pigment surface are driven off and replaced by the liquid of the millbase Particle covered with wetting agent Wetting agents Entrapped air Dispersing medium Agglomerates Good wetting (adjusting surface tension liquids phase through wetting agent): Enabling high pigment loading low millbase viscosity high milling efficiency ight beaker: with wetting agent, flowable mill base Figure 2: Illustration of pigment wetting & dispersion The process of dispersing follows Figure 3, which illustrates that dispersion requires the input of energy to break up the agglomerates into primary particles. Mechanical forces such as grinding or high speed dispersion are required for the above process. Once the particles are mechanically broken down to their primary size, stabilization of the particles takes place through the adsorption of the dispersing additives. To ensure long term stability of the dispersed primary particles, the dispersant molecules have to be firmly adsorbed onto the pigment surface. This means that the additive require the effective pigment affinic groups or segments which can interact strongly in the pigment surface by ionic bonding, dipoledipole interactions or hydrogen bonding. Why are wetting & dispersing agents utilized Agglomerated/flocculated particles 1 particle Dispersion Primary particles > 100,000 particles Pigment powder Defloccuated Primary particles Electrostatic repulsion Stabilization increases with thickness of electrical double layer Polyelectrolytes Additives used for dispersion in waterborne systems High molecular weight products containing electrical charges in side chains Polyphosphates Polycarboxylates Steric hindrance Stabilization increases with thickness of electrical double layer esin/solvent compatible chains protruding into the surrounding vehicle. Figure 3: Pigment dispersion process Figure 4: Mechanism of pigment stabilization The mechanism of pigment stabilization as shown in Figure 4 is either by electrostatic repulsion or steric hindrance or both. In case of water based pigment concentrates it is electrostatic repulsion and steric hindrance and in solvent borne systems it is mainly steric hindrance.

5 HMV polymer dispersants Patcham's innovative High Molar Volume technology dispersants are specially designed polymers with a higher volume per mass as compared to conventional high molecular weight dispersing agents. Multiple anchoring groups and multi compatible polymeric chains make it most suitable for high structured carbon blacks, organic pigments and wide range of resin systems Key features of High Molar Volume technology : Dense network of anchoring groups provides best wetting of pigments 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 Wetting and dispersion process: Stabilization Stabilisation: DLVO theory interaction attractive/repulsive forces attraction repulslon V+ V epulsive, electrostatic and or steric Da: Distance at which particles agglomerate d: decreasing distance between 2 particles Vt= Va+Vrs (sum forces) Va= van der Waals attraction Vr= epulsion forces eference: Additives for coating, WileyVCH,Ed.Johan Bieleman Figure 5a: DLVO theory for attractive & repulsive forces Wetting and dispersion process Conventional polymeric dispersants: low volume per mass Pigment stabilization of HMV polymer Da: distance at which particles agglomerate (elatively) low layer thickness of the adsorbed layer cannot prevnt attractive forces to dominate stabilizing forces: agglomeration adsorption layer cannot prevent agglomeration... Da Higher volume contributes to thicker adsorbed layer, preventing attractive forces to dominate stabilizing forces: Stable dispersion! Thicker adsorption layer preventing agglomeration... Figure 5b: Comparative mechanism of conventional and HMV technology based dispersing agents

6 based pigment concentrates Architectural pigment concentrates PatAdd DA 603 HMV polymeric wetting and dispersing agent for all type of pigment dispersions For FPC, MPC architectural and WB industrial paints, high temperature baking coatings, OEM coatings Strong dispersing properties educes millbase viscosity, enabling high pigment loading Minimize tendency of flocculation in waterborne coatings Strong contribution on electrostatic pigment stabilization and steric stabilization on pigment Optimum color development Wide applicability: aqueous systems, paints, inks and colorants Figure 6: Flow behavior of pigment concentrates based on PatAdd DA 603

7 based pigment concentrates PG 7 PY 42 P 170 PBLK 7 Figure 7: Mass tone of WB pigment concentrates Low VOC pigment concentrates Table 1: Low VOC formulation with PatAdd DA 603 LV aw materials Hostaperm Novoperm Yellow H6G Quin. violet F3K70 Hostaperm Bayferrox ed iron aven 14 Green GNX L3920 oxide PY 175 PV 19 P 170 PG 7 PBk7 PY 42 P 101 Weight (%) PEG PatAdd DA 603 LV Biocide PatAdd AF 34 Pigment Letdown PatAdd heol % HEC solution PatAdd AF Total

8 based pigment concentrates FPC esin Free Pigment Concentrate (PG based) Table 2a: Black pigment concentrate with PatAdd DA 603 aw materials FW 200 PBlk 7 Monarch 1000 PBlk 7 Monarch 1300 PBlk 7 Emperor 2000 PBlk 7 aven 5000 PBlk 7 Black B PBlk 7 BLK oxide PBlk Propylene glycol PatAdd DA PatAdd AF 34 Biocide Pigment PatAdd heol PatAdd AF 34 PatAdd heol Total Table 2b: Black pigment concentrate with PatAdd DA 603 aw materials MOGUL L PINTEX G N 326 N 330 Powcarbon aven Special 1009G 1255 P Black 4 PBlk 7 PBlk 7 PBlk 7 PBlk 7 PBlk 7 PBlk 7 PBlk 7 Weight (%) Propylene glycol PatAdd DA PatAdd AF Biocide Pigment PatAdd AF PatAdd heol Total

9 based pigment concentrates FW 200 Monarch 1300 aven 5000 N 326 Black oxide Figure 8: Mass & tint tone of WB black pigment concentrates Special Black 4 Table 3: Organic pigments with PatAdd DA 603 aw materials Hostaperm violet L HANSA brilliant yellow 2GX70 Pigment orange 13 ed FG 70 Irgazin DPP red BO Hostaperm pink E Hostaperm green GNX Heliogen blue L 7080 PV 23 PY 74 PO 13 P 112 P 254 P 122 PG 7 PB 15.3 Weight (%) Propylene glycol PatAdd DA PatAdd AF 34 Biocide Pigment PatAdd AF 34 PatAdd heol 100 Total

10 based pigment concentrates Hostaperm violet L HANSA brillent yellow 2GX70 Hosptaperm green GNX Yellow iron oxide ed FG 70 Heliogen blue L 7080 Figure 9: Mass & tint tone of WB pigment concentrates Table 4: Inorganic pigments with PatAdd DA 603 Opaque iron oxides Transparent iron oxides aw materials PY 42 P 101 P 101 PY 42 Weight (%) Propylene glycol PatAdd DA 603 PatAdd AF 34 HEC Biocide Pigment Letdown PatAdd AF 34 PatAdd heol Total

11 based pigment concentrates Table 5: White pigments with PatAdd DA 603 aw materials Tipure 902 Tronox Tronox C 826 C 828 Weight (%) Titanium dioxide Propylene glycol PatAdd DA Biocide PatAdd AF 34 Titanium dioxide Letdown PatAdd AF 34 3% HEC solution Total Tipure 902 Tronox C 826 Titanium dioxide Figure 10: WB white pigment concentrates based on PatAdd DA 603

12 based pigment concentrates Table 6: MPC esin minimal pigment concentrate (styrene acrylic emulsion) aw materials Advitya dye chem phthalocyanine blue PB 15:3 Bayferrox L 3920 PY 42 Weight (%) Organic bright yellow PY 74 Napthol red P Propylene glycol Styrene acrylic resin Biocide 0.40 PatAdd DA Pigment PatAdd AF 34 Letdown PatAdd heol 100 PatAdd AF 34 Total Figure 11: MPC esin minimal pigment concentrate

13 based pigment concentrates Table 7 : Color measurement and stability of WB pigment concentrates Properties Advaitya dye chem phthalocyanine blue PB 15:3 Bayferrox L 3920 PY 42 Organic bright yellow PY 74 Napthol red P 112 * Initial viscosity of PC, cp After stability test viscosity of PC, cp Color measurement (Initial), tinting strength with 1% PC in white base L* a* b* E, rubouts Color measurement (after stability, 45 days), tinting strength with 1% PC in white base L* a* b* E, rubouts * PC Pigment concentrate PB 15:3 PY 42 PY 74 Figure 12: Mass & tint tone of pigment concentrates

14 PATCHAM (FZC) P.O. Box: 7753, Saif Zone, Sharjah, UAE Tel: Fax: PATCHAM INDIA B52, Pravasi Industrial Estate Vishweshwar Nagar, Off Aarey oad Goregoan (E), Mumbai (India) Tel: PATCHAM EUOPE BV Klavermaten DD Goor Netherlands PATCHAM USA LLC 700 Plaza Drive Suite 216 Secaucus, New Jersey Tel: (201) Fax: (201) The information given in this booklet is intended for technical guidance without obligation. Ver. 1.0