Epoxy-polyamide coatings

In the freeboard areas, commercial ships use organic 2inc-rich primers extensively and usually topcoat them with a two- or three-coat epoxy system. U.S. Navy ships use an organic 2inc-rich primer, two to three coats of an epoxy-polyamide coatings, and a siUcone-alkyd topcoat (16) the entire dry system is 150—225 )J.m thick. 

Fig. 17. Cathodic delamination rates of galvanized steel/epoxy-polyamide coating systems when a 0.1 M CoCl2 dipping pretreatment was applied to the metal substrate prior to the application of the coating 91K (Reprinted with permission from Ref. 91Copyright (1981) American Chemical Society)...

Standish, J. V., Leidheiser, Jr., H. The effect of water on the dielectric properties of a corrosion-protective epoxy-polyamide coating, ACS Div. Org. Coat. Plast. Chem. Prepr. 43, 565(1980)... 

By far the most important coatings that make use of liquid amino-containing dimer polyamides and fatty amido amines are what is referred to as epoxy-polyamide coatings. These coatings are used widely as maintenance paints. 

In addition, the film has a long life and is resistant to the water, solvents, chemicals, acids, and alkali normally found in chemical and industrial environments. The epoxy-polyamide coatings have less resistance to strong solvents than do amine-cured systems, and their heat resistance tends to be somewhat lower. The properties of these coatings have been described in detail in several publications (32. 33). 

The dramatic corrosion resistance of epoxy-polyamide coatings is demonstrated by the data in a Government military specification, Mil-P-24441 (ships). This specification coating, at a relatively high solids of 61% by volume, is formulated entirely without... 

ATBN-modified epoxy/polyamide coatings (Table IX) exhibit excellent impact strength, CTBN-modified versions merit special attention (Table XI). 

Other. 2-Nitro-1-butanol is an excellent solvent for many polyamide resins, cellulose acetate butyrate, and ethylceUulose. It can be utilized in paint removers for epoxy-based coatings. 2-Hydroxymethyl-2-nitro-l,3-propanediol is usebil for control of odors in chemical toilets. Its slow release of formaldehyde ensures prolonged action to control odor, and there is no reodorant problem which sometimes is associated with the use of free formaldehyde. 2-Hydroxymethyl-2-nitro-l,3-propanediol solutions are effective preservative and embalming fluids. The slow Uberation of formaldehyde permits thorough penetration of the tissues before hardening. 

An unplgmented epoxy-polyamide top coat (Shell EPON 1001-T75 epoxy and Versamld 115 amldopolyamlne). 

Duvis, T., Papaspyrides, C.D. and Skourlis, T. (1993). Polyamide coating on carbon fibers and potential application in carbon/Kevlar/epoxy hybrid composites. Composites Sci. Technol. 48, 127-133. 

Epoxy coatings. A high solids two-component epoxy coating was prepared (Ciba Geigy Araldiate 6010 epoxy/Polyamide 840 hardener) and spray-applied to CRS and aluminum (Table 8). The coating was cured at 25°C and 50% relative humidity for 7 days. 

A typical starting formulation for a two-component epoxy-polyamide emulsion is shown in Table 14.3. This formulation can be used as either a coating or an adhesive. In either application, once the mixed emulsion is applied to the substrate, the water must be evaporated. In the case of the adhesive application, this must be completed before nonporous... 

Coating formulations and properties have been detailed in technical bulletins (31). The epoxy-polyamide system is popular because it provides an unusual degree of inherent corrosion resistance. This will be discussed in detail later. The system is unusually tolerant as compared to related systems, such as amine cured, since the ratio of components is not particularly critical. Tolerance is also demonstrated because it may be applied to wet surfaces and to surfaces with tightly bound rust. Indeed, formulations are available that may be applied under water to structures such as submarines and off-shore oil well riggings. Both the corrosion resistance and the tolerance relative to application on poorly prepared wet surfaces are believed to be functions of the surface activity of the polyamide resin. Related also to the surface activity are the unusually strong adhesive properties that the system demonstrates with a broad range of substrates. 

The epoxy-polyamide system may also provide a base for paper and board coatings applied by rotogravure or roller-coating techniques. It is useful for coating plastics and particularly valuable as a resin system for zinc-rich paints. It may be formulated with exempt solvents specified under Rule 66 (37). Higher solid formulations, particularly those formulated with fatty amido amines, are available. These formulations reduce solvent pollution and allow for higher film builds (37, 38). 

Dura-Pox Epoxy. [Soudiem Coatings] Polyamide epoxy. 

Thicker epoxy-based coatings, highly flexibllized with amine-reactive nitrile liquid polymer, have been described by Mendelsohn (50) in which the flexibilizing hardener is comprised of an admixture of ATBN, fatty polyamide and boron trifluoride/amine complex. This coating ages well at 100°C and has excellent toughness/ flex with good abrasion and vibration absorption properties. 

This study of elastomer-modified solution epoxy coatings uses typical epoxy-polyamide and epoxy-polyfunctional amine based models. 

Epoxy resins form a durable protective coating only when polymerized with amine, polyamide, or esterified fatty acids. Coal-tar epoxies are modified with coal-tar fiUer to improve moisture resistance. Coatings highly resistant to solvents, acids, and alkahs are based on phenoHc cross-linked epoxies. These coatings are used to protect process equipment. When the phenolformaldehyde constituent of phenol is used to cross-hnk epoxy resin instead of amine, the coating has improved resistivity to alkahs. 

Uses Used to mfg. polyamides or hardeners used with epoxies for coatings or adhesives... 

Chem. Descrip. N-P-(Aminoelhyl)-Y-aminopropylmethyldimethoxysilane CAS 3069-29-2 EINECS/ELINCS 221-336-6 Uses Coupling agent in acrylic, epoxy, polyamide, polyether, silicone, vinyl polymers, cellulosics, furan, melamine, nitrocellulose, PU, polyvinyl butyral, and urea-formaldehyde, for adhesives, coatings, filler Ireat-menL foundry, inks, rubber, sealants, and textile applies. 

VOC reducer, epoxy polyamide topcoats Boroslllcate glass VOC reducer, paints/coatings Borosilicate glass VOC reducer, primers Borosilicate glass... 

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