Top Banner

Click here to load reader

L DOW IQUID EPOXY RESINS (DGEBA) is a solid. Factors that may encourage crystallization include thermal cycling and the presence of filler, which acts as seed material for crystal

Mar 09, 2020

ReportDownload

Documents

others

  • DOWLIQUID EPOXY

    RESINS

    DOWLIQUID EPOXY

    RESINS

  • ContentsContents Introduction . . . . . . . . . . . . . . . . . .2 Products and Properties . . . . . . . . . . .3 Resin Structure . . . . . . . . . . . . . . . . . .5

    Curing Agents . . . . . . . . . . . . . . . .6 Primary and Secondary

    Polyfunctional Amines . . . . . . . .6 Aliphatic Polyamines . . . . . . . . .7 Aromatic Polyamines . . . . . . . . .7 Calculation of

    Stoichiometric Ratios . . . . . . .7 Anhydrides . . . . . . . . . . . . . . . . . . . . .9 Polyamides . . . . . . . . . . . . . . . . . . . . .10 Catalytic Curing Agents . . . . . . . . . . .11

    Reactive Diluents, Modifiers, Fillers . . . . . . . . . . . . . .12 Reactive Diluents . . . . . . . . . . . . . . . .12 Resin Modifiers . . . . . . . . . . . . . . . . . .13 Fillers . . . . . . . . . . . . . . . . . . . . . . . . .14

    Epoxy Formulating Techniques . . . . . . . . . . . . . . . . . . .15 Equipment . . . . . . . . . . . . . . . . . . . . .15 Temperature Control . . . . . . . . . . . . .15 Viscosity vs Temperature of D.E.R.

    Liquid Epoxy Resins . . . . . . . . . .15

    Resin Performance Data . . . . . .16 Test Methods . . . . . . . . . . . . . . . . . . . .17 Chemical and Solvent Resistance . . . . . . . . . . . . . . . . . . . . . .17 Cure Schedules . . . . . . . . . . . . . . . . . .18

    Liquid Epoxy Resins Cured with D.E.H.* 24

    Physical Properties . . . . . . . . . . .19 Electrical Properties . . . . . . . . . .20 Chemical, Solvent Resistance, and

    Thermal Degradation . . . . . .21

    Liquid Epoxy Resins Cured with 1,2-Cyclohexane Diamine

    Physical Properties . . . . . . . . . . .22 Electrical Properties . . . . . . . . . .22 Chemical, Solvent Resistance, and

    Thermal Degradation . . . . . . .23

    Liquid Epoxy Resins Cured with Nadic Methyl Anhydride

    Physical Properties . . . . . . . . . . .24 Electrical Properties . . . . . . . . . .25 Chemical, Solvent Resistance, and

    Thermal Degradation . . . . . . .26

    Liquid Epoxy Resins Cured with BF3 · MEA

    Physical Properties . . . . . . . . . . .27 Electrical Properties . . . . . . . . . .28 Chemical, Solvent Resistance, and

    Thermal Degradation . . . . . . .29

    Liquid Epoxy Resins Cured with Polyamide Curing Agent

    Physical Properties . . . . . . . . . . .30 Electrical Properties . . . . . . . . . .31 Chemical, Solvent Resistance, and

    Thermal Degradation . . . . . . .32

    Liquid Epoxy Resins Containing a Reactive Diluent

    Physical Properties . . . . . . . . . . .32 Electrical Properties . . . . . . . . . .33 Chemical, Solvent Resistance, and

    Thermal Degradation . . . . . . .33

    Additional Property Data . . . . . .34

    Storage . . . . . . . . . . . . . . . . . . . . . . . .35

    Hazards And Handling Precautions . . . . . . . . . . . . . . . . . . . .36 Health Hazards . . . . . . . . . . . . . . . . . .36 Handling Precautions . . . . . . . . . . . . .38 Flammability . . . . . . . . . . . . . . . . . . .39 Spill Containment and Cleanup . . . . .39

    Appendix–Abbreviations . . . . . . .40

    Product Stewardship . . . . . . . . . .41

    DOWLIQUIDEPOXYRESINS DOWLIQUIDEPOXYRESINS

    Note: Safety information on the handling of novolac resins, epoxy resins, solvents, diluents, modifiers, and other common “epoxy” formulation materials is critical. However, plant conditions and environ- ments vary so widely, no warranty of any kind can be given. Formulators-customers should contact their suppliers of each of these materials for specific safe handling recommendations. Companion bulletins, DOW Epoxy Resins Product Stewardship,

    Safe Handling and Storage Manual (Form No. 296-00312) and DOW Epoxy Curing Agents Product Stewardship, Safe Handling and Storage Manual (Form No. 296-01331), are available from the Dow Plastics (Thermoset Applications) Department or your Dow sales representative. ©1966, 1969, 1976, 1988, 1990, 1998, 1999 The Dow Chemical Company All rights reserved.

    1

  • 2

    D.E.R.* liquid epoxy resins, developed and marketed by The Dow Chemical Company, are commercially established as major raw materials in the fields of tooling, encapsulation, adhesives, lami- nates, and coatings.

    Similar commercial success has been earned by the families of D.E.R. solid and solution epoxy resins, flexible epoxy resins, brominated epoxy resins, D.E.N.* epoxy novolac resins, and D.E.H.* epoxy curing agents … also produced and marketed by Dow. And since these products are used with various curing agents, diluents, and modifiers, an almost unlimited range and variety of properties may be obtained.

    This bulletin describes the bisphenol A- based liquid epoxy resins and aliphatic glycol epoxy resins offered by Dow. Information on other DOW epoxy and epoxy-related products may be obtained from your Dow sales repre- sentative or by calling 1-800-441-4369.

    The curing of a liquid epoxy resin — i.e., converting it to a thermoset solid — is fundamental to its commercial use. This is also true of epoxy, poly- ester, phenolic, and melamine resins. However, liquid epoxy resins, because of their structure and the method of their cure, are superior to these other resins in the following properties:

    • No volatile loss during cure of product.

    • Dimensional stability during cure. They exhibit little shrinkage and can be used for very accurate reproduction.

    • Chemical resistance. Good resistance to a variety of chemicals (including solvents, acids, and bases) results with properly cured formulations.

    • Chemical inertness. They accept a wide range of fillers and pigments; they do not affect encapsulated parts or common containers.

    • Durability. Cured formulations exhibit good hardness, impact strength, and toughness.

    • Adhesion. The tenacity of epoxy adhesion to almost any surface is without equal among organic coatings.

    • Versatility in curing agent choice and curing conditions.

    Typically, bisphenol A/epichlorohydrin based resins, novolac based epoxy resins, and other di- or multifunctional resins containing the aromatic ring structure will cure to hard, rigid com- positions having rather low impact and elongation characteristics. There are many approaches to improving these properties and increasing flexibility in epoxy resin systems. Among them are modifications with vegetable oils, polyamide or polysulfide curing agents, or long chain polyglycols. However,

    such modifiers often adversely affect the physical, chemical, or solvent resis- tance properties of an epoxy system, or they limit the choice of curing agents and thus limit use in many applications.

    D.E.R. 732 and D.E.R. 736 flexible epoxy resins are designed to overcome many of the specific disadvantages of these other flexibilizing systems. They are compatible with practically all other epoxy resins and are shelf stable after mixing. Because they are true epoxy resins, they react with all epoxy curing agents and become an integral part of the cured system.

    Table 1 on page 4 lists the typical properties of DOW liquid epoxy resins; Table 2 lists the typical properties of two liquid epoxy resins that contain a reactive diluent (a C12-C14 aliphatic glycidyl ether), which provides reduced viscosities. Each resin is briefly described in the following paragraphs. Table 3 lists the typical properties of two flexible epoxy resins.

    Note: Prior to handling any of these resins, or related curing agents, diluents, catalysts, or solvents, be certain you have acquired from your supplier(s) adequate information pertaining to safe operations for your workers and your plant. Request Material Safety Data (MSD) sheets for each product from its supplier. See “Hazards” section, pages 39-42, and the bulletins mentioned in the note on the inside of the front cover.

    INTRODUCTIONINTRODUCTION

    *Trademark of The Dow Chemical Company.

  • D.E.R. 317 Epoxy Resin A high viscosity, fast reacting (20% faster than D.E.R. 331) liquid epoxy resin designed for adhesive applications requiring quick gelling with amine cur- ing agents.

    D.E.R. 324 Epoxy Resin A formulated blend of D.E.R. 331 and a C12-C14 aliphatic glycidyl ether to produce a low viscosity product. The product has utility in filled formulations for flooring compounds, grouts, adhesives, decoupage coatings, and high solids coatings. Blend ratio is 83/17 D.E.R. 331 to diluent.

    D.E.R. 325 Epoxy Resin A medium viscosity resin blend of 92/8 ratio of D.E.R. 331 to C12-C14 aliphatic gly- cidyl ether. Used in same applications as D.E.R. 324.

    D.E.R. 330 Epoxy Resin A low epoxide equivalent weight liquid resin processed to give very low viscosi- ty without the use of a reactive diluent.

    D.E.R. 331 Epoxy Resin A general purpose, widely used liquid resin. It is recognized as a standard from which variations have been developed.

    D.E.R. 332 Epoxy Resin The uniqueness of D.E.R. 332 epoxy resin is reflected in its maximum epox- ide equivalent weight of 178 (chemically pure diglycidyl ether of bisphenol A would have an epoxide equivalent weight of 170). Because of its high purity and

    3

    lack of polymer fractions, D.E.R. 332 resin provides uni- form performance and excep- tionally low viscosity and

    color. Under some conditions of cure, as illustrated in the cure schedule and property data (pages 18-33), it gives improved elevated temperature proper- ties.

    D.E.R. 332 resin frequently crystallizes at room temperature. The pure digly- cidyl ether of bisphenol A is a solid with a

Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.