PARALOID AE-1285 Acrylic Curing Agent for Isocyanate-Free, High-Solids, Durable Topcoats
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1 PARALOID AE-1285 Acrylic Curing Agent for Isocyanate-Free, High-Solids, Durable Topcoats Description PARALOID AE-1285 acrylic curing agent is a high solids acrylic resin that can be formulated with epoxy resins to a VOC at or below 3.5 lb/gallon (420 grams/liter) in ambient cure formulations. Two component, high performance topcoats, formulated with liquid "aromatic" bis-phenol A type epoxy resins such as Araldite GY-6010, offer a lower cost alternative to acrylic urethanes with similar performance. When PARALOID AE-1285 resin is used with "aliphatic," sorbitol based epoxy resins such as Erisys GE-60, a unique balance of properties is obtained which may be of interest to the epoxy formulator. Specifically, the coatings are more flexible and develop their ultimate properties faster. While early results indicate that coatings containing PARALOID AE-1285 resin with Erisys GE-60 are not as durable as coatings containing aromatic type epoxy resin, they are still significantly more durable than coatings based on non-acrylic curing agents with Erisys GE-60. Summary of Key Features and Benefits of Epoxy Coatings Based on PARALOID AE-1285 Feature Coating Benefit User Benefit Acrylic composition Light stable for long- Reduced need to repaint lasting appearance High solids Lower VOC Compliance with VOC regulations Crosslinking at ambient temperature Force drying or baking not required Can be used where acrylic urethanes are currently used Typical Physical Properties These properties are typical but do not constitute specifications. Non-Volatile Content, % (ASTM; one 110 C) 70 Viscosity at 25 C, cps 5000 Solvent, ratio, % as supplied Xylene Butanol Active Hydrogen Equivalent Weight Solids Basis As Supplied Density, lb/gal Solids Basis As Supplied Light Stabilizers Hindered amine light stabilizers (HALS), such as Tinuvin 292, are essential additives for these acrylic epoxy formulations. A starting point level of 2% based on total resin solids has significantly improved the color and gloss retention in exposure tests. Epoxy Resin Selection Although PARALOID AE-1285 acrylic resin would react with a wide variety of glycidyl-ether-functional resins, our initial formulation studies focused on the liquid types described in Table 1. Exposure studies to date indicate that coatings based on PARALOID AE-1285 acrylic resin and either epoxy have very good durability. The first and oldest exposure of a PARALOID AE-1285 prototype found the "aromatic" epoxy to have better appearance durability than the "aliphatic" epoxy.
2 Performance of Deeptone Blue Acrylic Epoxy Coatings This study was done in deeptone blue formulations, and it demonstrates the value of adding a light stabilizer to the formulation. Durability is determined by natural weathering versus various accelerated laboratory tests. Results are presented in Table 2. TABLE 1 Epoxy Crosslinker Type Effect on Performance Araldite GY-6010 bis-phenol A "aromatic" Better direct-to-metal corrosion protection Erisys GE-60 sorbitol polyglycidyl ether "aliphatic" Develops properties faster Imparts more flexibility TABLE 2 Coating Type Acrylic Epoxy Acrylic Urethane Polyamide Epoxy Curing Agent PARALOID AE-1285 PARALOID AU-608 HY 283 Type Acrylic Acrylic Polyol Polyamidoamine Crosslinker Epon 828 Erisys GE-60 Desmodur N-3300 Epon 828 Erisys GE-60 Type "Aromatic" Epoxy "Aliphatic" Epoxy Isocyanate "Aromatic" Epoxy "Aliphatic" Epoxy Initial 20 Gloss Natural Weathering 20 Gloss, without/with 2% Tinuvin 292 Florida, Black Box, South 5 6 months 84/84 79/81 70/78 25/15 74/68 11 months 64/69 40/53 0/0 0/0 17 months 52/64 10/30 48/54 chalking 0/0 28 months 1/34 1/1 23/30 eroding eroding Seabrooke, NJ, South months 62/71 42/42 66/67 0/0 0/0 28 months 32/42 10/14 39/39 eroding chalking Accelerated Weathering QUV (UVB-313) 375 hours 4/25 54/85 76/77 0/0 0/0 772 hours 1/2 1/39 71/74 chalking chalking Weather-O-Meter (Xenon arc) 2100 hours 51/65 49/70 68/69 0/0 14/ hours 14/43 21/23 65/68 0/0 1/4 Catalyst and Co-Curing Agents PARALOID AE-1285 acrylic resin contains a catalyst which gives it better reactivity and less water sensitivity than would be afforded by adding a less permanent catalyst to the formulation. Non-volatile amines and polyamides, however, can be useful co-curing agents for PARALOID AE Table 3 contains a summary of the effects determined in our laboratory for co-curing agents evaluated to date. All the amine co-curing agents are less weatherable than the acrylic, so there is some loss in durability. Better durability is expected with saturated polyamide resins such as Henkel's Versamid 1540.
3 TABLE 3 Viscosity, Co-curing Agent 100% solids Type Effect on Performance Hardener HY modified Improves solvent resistance polyamidoamine Increases flexibility and impact resistance of unweathered films Hardener Araldite HY modified polyamidoamine Hardener HY modified aliphatic amine Improves solvent resistance Does not improve flexibility Slows the dry times Lowers the VOC Harder and less flexible films Does not slow the dry nor yellow the films as much as the polyamidoamines Lowers the VOC Performance of Black Acrylic Epoxy Coatings The performance of black topcoats based on PARALOID AE-1285 acrylic resin, with and without Hardener HY 283, is demonstrated in aromatic (Araldite GY-6010) and aliphatic (Erisys GE-60) screening formulations. The durability of these black topcoats, with and without Hardener HY 283, is also demonstrated. Data are presented in Table 4. The durability of these black topcoats, with and without Hardener HY 283, is demonstrated in the results of actual exposure in black box South 5 in Florida and accelerated QUV exposure. The black screening formulations contained the light stabilizer Tinuvin 292 at the 2% level. The contribution of the acrylic to durability is clearly demonstrated. See Table 5. Standard QUV tests utilizing UVB-313 bulbs are not good predictors of exterior performance. This is particularly evident in the gloss retention of bis-phenol A ("aromatic") epoxies cured with PARALOID AE-1285 acrylic resin. This QUV test predicts that these coatings have much poorer durability than acrylic urethanes, whereas exposure tests to date suggest comparable durability. QUV results utilizing the UVA-340 bulbs which lack the UVB wavelengths seem to be better predictors of the weathering properties of these acrylic epoxy coatings relative to other coating systems. Accelerated weathering testing with the xenon-arc Weather-O-Meter is also preferable to the QUV/UVB tests.
4 TABLE 4 High Solids Acrylic Epoxy High Epoxy Crosslinker Erisys GE-60 Araldite GY-6010 Modified polyamidoamine Co-curing agent None HY-283 None HY-283 Application Characteristics Pot Life Viscosity (cps) after 2 hours after 4 hours Dry Speed Dry to Touch Tack Free (100g) Dry Hard (500g) Early Water Fog Resistance 60% Gloss retention after 8 hours rain films dried for: 1 75 F 2 47 F MEK Rub Resistance 7 47 F 7 75 F Properties after F Hardness KHN Pencil Impact Resistance Direct Reverse H H >140 > H Chemical Resistance Spot Test appearance after 24 hour exposure and 24 hour recovery 10% Acetic Acid 10% Hydrochloric Acid Xylene (1 hr exposure) Blister Lift Lift 30 2 Blister H 30 4 Blister Solids Acrylic Urethane H > TABLE 5 High Solids Acrylic Epoxy Epoxy Crosslinker Araldite Erisys GE-60 GY-6010 No Acrylic High Solids Acrylic Urethane Modified polyamidoamine Co-curing agent None HY-283 None HY-283 HY-283 Durability - 60 /20 gloss Initial 94/87 95/90 97/92 98/95 95/88 Natural Weathering Florida, Black box, South 5 6 Months 89/80 88/73 89/78 89/76 7/1 89/81 Accelerated Weathering QUV (UVB-313) 648 hrs 935 hrs 84/61 61/41 65/21 49/9 46/9 40/5 38/4 20/1 0/0 0/0 89/77 88/76 QUV (UVA-340) 625 hrs 911 hrs 1436 hrs 2011 hrs 89/80 88/74 86/70 85/67 84/61 92/86 92/85 91/83 89/77 90/78 89/74 89/75 87/69 77/45 12/1 1/0 0/0 90/82
5 TABLE 6 Black Acrylic Epoxy Enamels Based on PARALOID AE-1285 Screening Formulations Materials Lb Gal Lb Gal Lb Gal Lb Gal Acrylic Component "A" Sand Grind: PARALOID DM-55 (100%) Arcosolv PM Raven 420 Carbon Black Letdown: PARALOID AE-1285 (70%) Hardener HY-283 (100%) Butanol SF-1023 (flow aid) Tinuvin 292 (HALS) Epoxy Crosslinker, Component "B" Erisys GE-60 (100%) Araldite GY-6010 (100%) Totals Formulation Constants Weight solids, % Volume solids, % Resin solids, % Acrylic Polyamide HY Epoxy Erysis GE Araldite GY Initial viscosity (ICI; cps) Below constants are for 1, 2, 3, & 4 PVC, % 3 Pigment/binder ratio 5/95 Stoichiometry 1.25/1 epoxy to active H+ equivalents Calculated VOC, lb/gal 3.2 Tinuvin 292 (HALS), % 2 Performance of White Acrylic Epoxy Coatings The performance of white topcoats based on PARALOID AE-1285 acrylic resin, with and without Hardeners Araldite HY-360 and HY-2964, is demonstrated in aromatic (Araldite GY-6010) screening formulations. See Table 7.
6 TABLE 7 High Solids Commercial Epoxy High Solids Acrylic Epoxy Topcoat Epoxy Crosslinker Araldite GY-6010 HY-2964 Co-curing agent No Araldite HY-360 modified polyamidoamine modified aliphatic amine Pot life Viscosity (cps) after 2 hours after 4 hours Dry speed, hours Dry to Touch 1/2 4 6 Tack Free (100g) 2 24 Dry Hard (500g) 5 30 Early Water Fog Resistance % 60 Gloss Retention after 8 hours rain on films dried for 1 75 F Properties after F Hardness KHN Pencil H 2H 3H 4H Impact Resistance Direct Reverse 2 2 <2 20 Chemical Resistance Spot test appearance after 24 hour exposure and 24 hour recovery 10% Sodium hydroxide 10% Hydrochloric acid Xylene (1 hour exposure) Durability, QUV (UVA-340) Gloss retention Initial gloss (60 /20 ) 94/85 96/92 97/92 65/20 After 810 hrs (60 /20 ) 82/62 73/40 58/22 2/1 Color retention Initial color (b value) After 810 hrs (b value)
7 TABLE 8 White Acrylic Epoxy Enamels Based on PARALOID AE-1285 Screening Formulations Materials Lb Gal Lb Gal Lb Gal Acrylic Component A Grind preparation PARALOID AE-1285 (70%) BYK TiPure R-960 TiO Letdown PARALOID AE-1285 (70%) Hardener HY-360 (100%) Hardener HY-2964 (100%) MethylisoButyl Ketone Methylethyl Ketone Tinuvin 292 (HALS) Subtotal Epoxy Crosslinker Component B Araldite GY-6010 (100%) Arcosolv PM Methyliso Butyl Ketone _ _ _ _ Subtotal Totals Formulation Constants Weight solids, % Volume solids, % Resin solids, % Acrylic Polyamine HY Aliphatic amine HY Epoxy Araldite GY Initial viscosity (ICI; cps) PVC, % Calculated VOC, lb/gal Stoichiometry (epoxy/active H+) 1.5/1 1.25/1 1.25/1 Pigment/binder ratio 40/60 40/60 40/60 Tinuvin 292 (HALS), % 2 2 2
8 Raw Material Suppliers Trade Name Function Supplier PARALOID DM-55 Dispersant The Dow Chemical Company 2030 Dow Center Midland, MI Araldite GY-6010 Aromatic bis-phenol A epoxy resin VANTICO, Inc. 281 Fields Lane Brewster, NY Erisys GE-60 Aliphatic sorbitol polyglicidyl ether epoxy resin CVC Specialty Chemicals, Inc Route 73 North Maple Shade, NJ Arcosolv PM Solvent Lyondell Chemical Co West Chester Pike Newtown Square, PA BYK 300 Flow aid BYK Chemie 524 S. Cherry Street Wallingford, CT Hardener HY-283 Hardener HY-2964 Hardener HY-360 Polyamine Aliphatic amine Polyamine VANTICO, Inc. 281 Fields Lane Brewster, NY Raven 420 Carbon black Cabot Roofing Company 125 High Street Boston, MA SF1023 Flow aid General Electric Company Mechanicsville Road Waterford, NY Tinuvin 292 Light stabilizer VANTICO, Inc. 281 Fields Lane Brewster, NY TiPure R-960 Titanium dioxide E. I. du Pont de Nemours & Co. White Pigments & Mineral Pdts Market Street Wilmington, DE Safe Handling Information Dow Material Safety Data Sheets (MSDS) contain pertinent information that you may need to protect your employees and customers against any known health or safety hazards associated with our products. Under the OSHA Hazard Communication Standard, workers must have access to and understand MSDS on all hazardous substances to which they are exposed. Thus, it is important that you provide appropriate training and information to your employees and make sure they have available to them MSDS on any hazardous products in their workplace. The Dow Chemical Company sends MSDS on non-osha-hazardous as well as OSHA-hazardous products to its customers upon initial shipment, including samples. If you do not have access to one of these MSDS, please contact your local Dow representative for an additional copy. Updated MSDS are sent upon revision to all customers of record. In addition, MSDS are sent annually to all customers receiving products deemed hazardous under the Superfund Amendments and Reauthorization Act. MSDS should be obtained from your suppliers of other materials recommended in this bulletin. Additional safe handling information is available from Dow representatives.
9 The Dow Chemical Company is a member of the American Chemistry Council (ACC) and is committed to ACC s Responsible Care Program. PARALOID is a trademark of The Dow Chemical Company. These suggestions and data are based on information we believe to be reliable. They are offered in good faith, but without guarantee, as conditions and methods of use of our products are beyond our control. We recommend that the prospective user determine the suitability of our materials and suggestions before adopting them on a commercial scale. Suggestions for uses of our products or the inclusion of descriptive material from patents and the citation of specific patents in this publication should not be understood as recommending the use of our products in violation of any patent or as permission or license to use any patents of The Dow Chemical Company Rohm and Haas Company is a wholly owned subsidiary of The Dow Chemical Company. All rights reserved. April 1999
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