TRIMET TME in Fast Air Drying Water Soluble Alkyd Enamels

Transcription

1 TRIMET TME in Fast Air Drying Water Soluble Alkyd Enamels TRIMET TME TECHNICAL BULLETIN #5 North America 300 Brookside Avenue Building #23, Suite 100 Ambler, PA USA (Toll Free ) Europe Charleston Road Hardley, Hythe Southampton, Hampshire SO45 3ZG UK PaintsandCoatings@geosc.com

2 Trimethylolethane CH 2 OH CH 3 C CH 2 OH CH 2 OH CAS Registry No EINECS Registry No Introduction TRIMET TME Trimethylolethane, manufactured by GEO Specialty Chemicals Inc., is a polyol useful in the preparation of alkyd resins. This bulletin compares a water-soluble resin based on TME with a similar resin based on glycerol. Such resins are appropriate for a wide range of industrial coatings, including implement coatings. TME is the polyol of preference over glycerol for the formulation of fast air drying, water-soluble resins. The TME-based resin affords a faster cure, lower colour and water reducibility. The resultant resins are chemically analogous to the short oil alkyd resins traditionally used in implement enamel. They are expected to offer similar good weathering properties and, with proper modifications, good resistance to water. Resin Formulation TME is an excellent polyol for use in the manufacture of fast air drying, water-soluble resins. The basic resin chosen for this study can be modified with different fatty acids depending on cost, availability, and the degree of whiteness retention desired. Although acid functionality is necessary for water solubility, excessive acidity in the finished resin can be a cause of water resistance problems. To obtain optimal properties, it is necessary that the resin be processed to a specific endpoint. The basic resin formulation is shown in Table 1. Enamel Formulations White enamels were prepared, applied to Bondrite 1000 panels and allowed to air dry prior to testing. In all cases, naphthenate driers were employed. The enamel based on the TME resin showed faster drying and improved gloss retention, adhesion, hardness and flexibility. For those applications which call for additional whiteness retention and impact resistance, along with improved weathering and salt spray resistance, it is recommended that a chelate dryer system and a hard resin be incorporated. The choice of enamel formulation for a particular application will of course depend on the requirements of the specific end use. In general, implement enamels require a fast dry, water resistance and good weatherability. Many less demanding industrial applications will find basic unmodified formulations to be of utility. 2

3 Table - Water Soluble Alkyd Resin WS101 and WS102 (Parts by weight) Resin Designation WS101 WS102 Linoleic Fatty Acid TRIMET TME Glycerol Isophthalic Acid Trimellitic Anhydride Total Processing: 1. Charge fatty acid, polyol and isophthalic acid to the reaction kettle. Heat rapidly with agitation to 175 C where esterification begins. 2. Heat over a 3 hour period to 238 C and hold for an acid number below Cool to 175 C, add trimellitic anhydride and hold at 175 C for an acid number of 50 to 60 and an 18 to 22 sec. cure. 4. Cool to 150 C and thin to 75% solids in co-solvent. Resin Characteristics WS101 WS102 Acid Number (Solids), mgkoh / g Viscosity, Gardner Z6 Z6 to Z7 Non-volatile matter (NVM) % Co-solvent 1:1 Butanol / Butyl Cellosolve C 20 sec. 22 sec. Colour, Gardner 7 8 Table 2 - General Purpose Gloss Enamel Alkyd Resin (75% NVM ) BE Ammonium Hydroxide 17.0 Titanium Dioxide % Cobalt Naphthenate 2.0 6% Manganese Naphthenate 2.0 Drier Accelerator Anti-skin Agent Water Flow Agent Pamolyn 200, Hercules Inc. 5 Ti-Pure R-901 E.I DuPont de Nemours & Co. 2 IPA-85, BP Amoco Chemical Co. 6 Activ-9, R.T. Vanderbilt Co. 3 Paint Formulation Quantity (Grams) TMA, BP Amoco Chemical Co. 4 Union Carbide 8 FC-430, 3M Co. 7 Exkin No 2, Nuodex Div. Tenneco Co. 3

4 Table 3 - Solution Properties & Dry Film Test Resin Designation WS101 WS102 Polyol TRIMET TME Glycerol ph Spray Viscosity #4 Ford 25 C 100 sec. 100 sec. Drying Characteristics 25 C, 58% Relative Humidity Dry to Touch, minutes 8 7 Dry to cotton, minutes gram Zapon, hours 2 3 Hardness 24 hours B 2B 48 hours B 2B 72 hours HB 2B 1 week H HB 1/8 Conical Bend, Pass % Gloss Cross Hatch Adhesion, Pass % Physical Performances of Cured Enamels Table 4-24 Hour Water Immersion Both enamels were applied to Bondrite 1000 panels at a film thickness of mm. Panels were aged for one week, backed with a primer and edge coated with paraffin. One panel of each paint (*) was scribed with a sharp razor to expose the bare metal. All panels were immersed in distilled water for 24 hours. Resin Designation 101- A 101- B* 102- A 102- B* Polyol TRIMET TME TRIMET TME Glycerol Glycerol Original Gloss hour Gloss Loss in Gloss

5 Table Hour Salt Spray Resistance Both enamels were applied to Bondrite 1000 panels at a film thickness of mm. Panels were aged for one week, backed with a primer and edge-coated with paraffin. One panel of each paint (*) was scribed with a sharp razor to expose the bare metal. All panels were placed in a salt spray chamber and exposed to a 5% salt solution and a cabinet temperature of 32 C for 100 hours. Resin Designation 101- A 101- B* 102- A 102- B* Polyol TRIMET TME TRIMET TME Glycerol Glycerol Film Thickness, mil Original Gloss hour Gloss Loss in Gloss Panel Condition severe fine blisters, rusting at bottom fine blisters, mm creepage at scribe severe blisters, severe rusting severe blisters, mm creepage at scribe Table 6 - Impact Resistance Both enamels were applied to Bondrite 1000 panels at a film thickness of mm. Panels were then aged for one week. Panel Number Direct Impact 10 pounds pass - 20 pounds pass fail 30 pounds - fail Reverse Impact 10 pounds pounds fail fail TRIMET is a registered trademark of GEO Specialty Chemicals, Inc. All information and data, including the formulations and procedures discussed herein, are believed to be correct. However, this should not be accepted as a guarantee of their accuracy, and confirming tests should be run in your laboratory or plant. No statement should be construed as a recommendation for any use which would violate any patent rights. Sales of all products are pursuant to terms and conditions included in GEO Specialty Chemicals sales documents. Nothing contained therein shall constitute a guarantee or warranty with respect to the products described or their use. Safety information regarding these products is contained in their Safety Data Sheets. Users of these products are urged to review and use this information. 5 Reviewed: November 2017