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Epoxy Resins & Curing Agents

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Epoxy Resins & Curing Agents EPOTUF® Epoxy Resins & Curing Agents STRENGTHEN YOUR COATING CALCULATING MIX RATIOS PERFORMANCE WITH EPOTUF® Calculate the stoichiometric parts by weight of curing agent per 100 parts of epoxy resin (phr). Formulating coatings for marine, aerospace, industrial maintenance and flooring applications is a tough job made phr = AHEW of Curing Agent X 100 easier by using raw materials that provide tough performance. Reichhold’s EPOTUF® resins provide the epoxy EEW of Epoxy Resin coatings formulator with a broad selection of epoxy resins and curing agents. Example: EPOTUF® 37-127 epoxy resin EEW = 200 Epoxies are thermosetting resins that contain an oxirane or epoxide ring and form infusible, insoluble solids when EPOTUF® 37-601 curing agent AHEW = 85 crosslinked with amine or other types of curing agents. Curing agent selection and conditions are key factors which determine the final properties of epoxy systems. Typically curing agents crosslink epoxy resins in one of two ways: phr = 85 X 100 = 42.5 by reacting with the epoxide group to become part of the final polymer network or by acting as a catalyst to promote 200 homopolymerization of the resin. Therefore, 42.5 parts of EPOTUF® 37-601 curing agent are needed to cure 100 parts of EPOTUF® 37-127 epoxy resin for a 1:1 stoichiometric ratio. PERFORMANCE MAJOR MARKETS Calculate the AHEW of a blend of curing agents. • Excellent adhesion • Protective coatings • Low shrinkage • Construction / civil engineering AHEW of Curing Agent Blend = Total Weight of Curing Agent Blend Weight A Weight B • Excellent mechanical properties • Structural adhesives + AHEW AHEW • Excellent solvent & chemical resistance • Composites A B • Good electrical properties • Electronics / encapsulation Example: EPOTUF® 37-127 epoxy resin is being used with a curing agent blend consisting of 80 parts EPOTUF® 37-601 and 20 parts EPOTUF® 37-635. EPOTUF® EPOXY RESIN & CURING AGENT MIX RATIO To achieve the optimum performance results from an epoxy / amine curing agent system, it is important to use the EPOTUF® 37-127 epoxy resin EEW = 200 resin and curing agent in the appropriate stoichiometric mix ratio where calculations are based on the ratio of the EPOTUF® 37-601 curing agent AHEW = 85 reactive components. After testing the stoichiometric 1:1 ratio it may be necessary to vary the ratio of epoxy to amine EPOTUF® 37-635 curing agent AHEW = 74 depending on the application and desired physical properties. The table below highlights some general trends observed when excess amine or epoxy are used. AHEW of Curing Agent Blend = 100 = 83 phr = 83 X 100 = 41.5 80 20 200 + 85 74 Property Excess Amine Excess Epoxy Therefore, 41.5 parts of curing agent blend are needed to cure 100 parts of EPOTUF® 37-127 epoxy resin. Water Resistance Reduces Increases Calculate the EEW of a blend of epoxy resins. Heat Distortion Reduces Reduces EEW of Epoxy Resin Blend = Total Weight of Epoxy Resin Blend Acid Resistance Reduces Increases Weight A Weight B + Alkali Resistance No Effect No Effect EEWA EEWB Solvent Resistance Reduces Reduces Example: 90 parts of EPOTUF® 37-140 epoxy resin is being blended with 10 parts of EPOTUF® 37-051 reactive diluent Flexibility Increases Reduces to reduce the viscosity. This epoxy resin blend will be reacted with EPOTUF® 37-703 curing agent. To calculate the stoichiometric use ratio, the following information is needed: EPOTUF® 37-140 epoxy resin EEW = 185 • Amine Hydrogen Equivalent Weight (AHEW) of curing agent EPOTUF® 37-051 epoxy resin EEW = 675 EPOTUF® 37-703 curing agent AHEW = 93 AHEW = Molecular Weight of Amine or 56,100 EEW of Epoxy Resin Blend = 100 = 200 phr = 93 X 100 = 47 # of Amine Hydrogens (Amine Value) x (Average # H’s per N) 90 10 200 + 185 675 • Epoxide Equivalent Weight (EEW) of epoxy resin Therefore, 47 parts of EPOTUF® 37-703 curing agent are needed to cure 100 parts of the epoxy resin blend. EPOXY RESINS EEW OR GARDNER COLOR VISCOSITY COMPLIANCE PRODUCT TYPE % SOLIDS SOLVENT ACID VALUE DESCRIPTION (maximum) (cps @ 25°C) INFORMATION* SUGGESTED APPLICATIONS (on solids) Reactive Diluents High molecular weight aliphatic polyfunctional epoxy resin Adhesives, sealants, laminates, high-solids flexible EPOTUF® 37-051 Aliphatic Polyfunctional 100 — 1 250 EEW = 675 FDA 175.105 used as a modifier, improves adhesion, imparts flexibility and toughness, extends pot life, low viscosity coatings, filament winding, potting and encapsulation Aliphatic monofunctional epoxy diluent based on Alkyl Flooring, laminates, tooling, adhesives, water reducible EPOTUF® 37-058 Aliphatic Monofunctional 100 — 1 13 EEW = 290 FDA 175.300 Glycidyl Ether C12-C14, low viscosity, low volatility and toxicity, allows high filler levels coatings, castings, potting and encapsulation LiQuid Resins Undiluted liQuid epoxy resin based on diglycidyl ether of Bisphe- nol-F (Bis-F), used alone or as a modifier for EPOTUF® 37-140, High solids coatings, fiberglass reinforced plastics, EPOTUF® 37-138 LiQuid Bis-F Resin 100 — 2 3,600 EEW = 170 FDA 175.300 improves organic acid and solvent resistance, slows gel and electrical encapsulation and laminates, adhesives, thin film set times, greatly reduced crystallization potential flooring, sealants FDA 175.105, Standard undiluted liQuid epoxy resin based on Bisphenol-A Solvent-borne and high build coatings, high pressure EPOTUF® 37-140 LiQuid Bis-A Resin 100 — 1 12,000 EEW = 185 175.300, 176.170, (Bis-A), industry workhorse, good reactivity and resistance laminating, castings, adhesives, flooring, potting and 176.180, 177.2420 properties, high heat distortion temperature encapsulation Water-borne LiQuid Resin Dispersion of liQuid epoxy resin, can formulate compliant LiQuid Bis-A Resin Industrial maintenance coatings, concrete floor EPOTUF® 37-143 78 Water Milky 3,000 EEW = 200 — two component water-borne epoxy coatings when cured Dispersion with EPOTUF® 37-680 and 37-685, freeze/thaw stable coatings, architectural coatings, clear wood coatings, Diluted Resins 100% reactive Bis-A epoxy based resin diluted 20% by weight Adhesives, grouts, coating applications reQuiring high EPOTUF® 37-100 Aliphatic Polyfunctional 100 — 3 4,000 EEW = 220 FDA 175.105 with EPOTUF® 37-051, improves flexibility, extends pot life, solids and/or substantially improved toughness and good adhesion, medium viscosity flexibility ANSI 118.3 when 100% reactive Bis-A / Bis-F epoxy resin blend diluted 12% by High solids or 100% solids coatings and flooring, EPOTUF® 37-108 Aliphatic Bis-A / Bis-F Blend 100 — 2 1,400 EEW = 190 cured with weight with EPOTUF® 37-058, provides better thermal and EPOTUF® 37-628 chemical resistance than Bis-A based diluted epoxies water-washable grouts, adhesives, composites 100% reactive Bis-A epoxy based resin diluted 20% by weight FDA 175.300, Adhesives, grouts, coatings, flooring, wet lay-up EPOTUF® 37-127 Aliphatic Monofunctional 100 — 1 650 EEW = 200 with EPOTUF® 37-058, excellent toughness and flexibility, 176.170, 176.180 low color and viscosity laminating, potting and encapsulation 100% reactive Bis-A epoxy based resin diluted 35% by weight Wet lay-up laminating, coatings, flooring, potting EPOTUF® 37-128 Aromatic Monofunctional 100 — 2 750 EEW = 200 — with Phenol Glycidyl Ether C8-C10, excellent penetration, high filler loading, low viscosity and encapsulation, syntactic foam 100% reactive Bis-A epoxy based resin diluted 8% by weight EPOTUF® 95-406 Aliphatic Monofunctional 100 — 1 2,600 EEW = 190 — with EPOTUF® 37-058, excellent toughness, low color, Adhesives, flooring, grouts, coatings medium viscosity Solvent Cut Resins Solvent cut solid Bis-A epoxy resin, high molecular weight, fast High performance coatings, structural steel primers, EPOTUF® 38-501 Type 1 75 MIBK / Xylene 3 9,700 EEW = 525 FDA 175.300 dry, excellent toughness and impact resistance, good corrosion concrete sealers and surfacers, tank linings, container and chemical resistance coatings FDA 175.105, High performance coatings, structural steel primers, EPOTUF 38-505 Type 1 75 Xylene 3 11,000 EEW = 500 Solvent cut solid Bis-A epoxy resin, fast dry, good flexibility and concrete sealers and surfacers, tank linings, container ® 175.300,176.170, impact resistance, good corrosion and chemical resistance 176.180 coatings, flooring, marine coatings FDA 175.105, Solvent cut solid Bis-A epoxy resin, high hydroxyl content, good adhesion, improved toughness and impact resistance, good High performance coil, can, powder coatings and EPOTUF® 38-531 Type 6 55 PM Acetate 3 8,700 EEW = 1,825 175.300, 176.170, drum linings 176.180 corrosion and chemical resistance * For FDA applications, contact Reichhold product regulatory group for specific use limitation information. EPOXY RESINS EEW OR GARDNER COLOR VISCOSITY COMPLIANCE PRODUCT TYPE % SOLIDS SOLVENT ACID VALUE DESCRIPTION (maximum) (cps @ 25°C) INFORMATION* SUGGESTED APPLICATIONS (on solids) Modified Resins FDA 175.105, Modifier for epoxies, 2K urethanes and baking polyester High solids coatings, high peel strength adhesives, EPOTUF® 37-151 Flexible 100 — 5 50,000 EEW = 500 175.300, 176.170, systems to improve flexibility, adhesion and weathering, elastomeric coatings, potting and encapsulation 176.180 very fast viscosity reduction curve, elongation up to 25% Permanently flexible epoxy resin, excellent adhesion to a High performance 1K or 2K systems for coatings and EPOTUF® 38-572 Flexible 75 Xylene 7 2,400 EEW = 660 FDA 175.300 variety of substrates, good weathering resistance, good adhesives, rail car primers, DTM coatings chemical and solvent resistance, wide recoat window
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