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Why Diluents ?

Why Diluents ?. That’s Why !!!!!!. Why Diluents ??. High processing viscosities of unmodified liquid epoxy resin systems Impregnating and wetting properties are favourably influenced by reducing the viscosity Larger filler amounts may be used cheaper formulation

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Why Diluents ?

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  1. Why Diluents ? That’s Why !!!!!!

  2. Why Diluents ?? • High processing viscosities of unmodified liquid epoxy resin systems • Impregnating and wetting properties are favourably influenced by reducing the viscosity • Larger filler amounts may be used • cheaper formulation • reduce the possible development of heat and shrinkage upon cure • Possible Disadvantages; • May sweat out of the binder system • Reduced flexibility • Influence the properties of the binder system • Hardness • Rate of cure • Adhesion, Intercoat adhesion • Chemical resistance

  3. CH2-OH OH Non-Reactive Diluents • Alcohols • Benzylalcohol • Furfurylalcohol • Nonyl phenol • Acceleration effect • Phthalates • Dibutylphthalate • Hydrocarbon Resins • Necirez-products • Epodil-L • Pine-oil

  4. O O O = O O C Reactive Diluents • Polypropylene glycol diepoxides • D.E.R.™ 732P liquid epoxy resin • D.E.R. 736P liquid epoxy resin • Alcoholglycidylethers & esters [ mono- or multi-functional ] • EMS [ Grilonit ] • Prümmer [ Polypox ] • Resolution [ Heloxy, Cardura E-10] • Air Products [ Epodil ] • Etc… ™ Trademark of The Dow Chemical Company

  5. Reactive Diluents

  6. Viscosity Cutting Powder p-tert. BP GE = R 7 BDDGE, o-CGE, HDDGE = R 3, 6, 18 C12-C14 AGE = R 24 2-EH GE = R 17

  7. General Observations • The addition of reactive diluents might have the following effects: • reduced viscosity, • changed surface tension [ wetting, air-release etc. ], • changed reactivity, especially for the mono-functional reactive diluents, • changed solvent resistance, • changed physical strength, • changed linear coefficient of expansion, • changed flexibility / impact resistance, • changed abrasion resistance • ......

  8. Reactive Diluents used by Dow o-Cresyl Glycidyl ether C12 - C14 alkyl Glycidyl ether Hexane diol di Glycidyl ether Compromise between Environmental, Hygiene & Safety aspects and performance.

  9. o-Cresyl Glycidyl ether Typical properties EEW 180 g/eq Viscosity 7 mPa.s @ 25 °C

  10. Hexane Diol Di Glycidyl ether Typical properties EEW 142 g/eq Viscosity 14 mPa.s @ 25 °C Total Chlorine ca 4 wt%

  11. C12 - C14 Alkyl Glycidyl Ether Typical properties EEW 280 g/eq Viscosity 7 mPa.s @ 25 °C Total Chlorine ca 3 wt% Remark : FDA approved for food contact applications

  12. Viscosity Cutting Power ™ Trademark of The Dow Chemical Company

  13. Influence on the chemical resistance

  14. Aromatic IPD-adduct DETA-adduct Polyamide D.E.R.™321 Dist. Water + 1.3 + 2.1 + 1.2 + 2.5 10 wt% HCl + 1.1 + 1.7 + 1.1 + 6.5 10 wt% NaOH + 1.1 + 1.7 + 1.0 + 2.0 10 wt% HAc + 1.4 + 5.4 + 20 Destroyed Xylene + 1.4 + 9.8 + 4.9 Destroyed Gasoline - 0.1 0 + 0.2 + 23 D.E.R.™330 Dist. Water + 1.4 + 1.4 10 wt% HCl + 1.1 + 1.3 10 wt% NaOH + 1.1 + 1.0 10 wt% HAc + 1.3 + 5.1 Xylene + 0.1 + 0.1 Gasoline + 0.1 0 Chemical Resistance ™ Trademark of The Dow Chemical Company

  15. Enough Chemistry !

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