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Film adhesives durability

Acrylic latex paints dominate the trade sales market for both exterior and interior use because of their balance of film adhesion, durability, flexibility, color stability and alkali resistance, together with resistance to blistering and chalking. Thermoplastic acrylic solvent-based paints are used in high volume applications, like automotive finishes, while thermoset acrylics are used to bake a hard enamel finish on large appliances. [Pg.115]

The chemical literature reveals relatively new and varied interests for nitrile elastomer-modification of epoxy resins in diverse areas of coatings and primers. Desirable properties such as impact resistance, mandrel bend and adhesion improvement are attainable with little or no sacrifice in critical film properties. In some instances, it is documented that proper elastomer modification of select epoxy coatings will enhance corrosion and moisture resistance. This may relate to better film/substrate adhesion durability. The combined literature, journal and patent, has led to continuing study of nitrile elastomer modified epoxy coatings. [Pg.16]

Uses Binder, antistat, slip control, gellant for textile and paper treatment antisticking aid in cellophane film binder in catalysts, inorg. film, ceramic fiber, precision casting, insulating materials refractory material glass fibers vehicle for paints and adhesives for fabric and paper improves adhesion, durability, abrasion resist, in coatings antislip in floor waxes in polishes for silicon semiconductor wafers metal surf, treatment batteries food pkg. applies. [Pg.762]

The results for the 120 C-curing epoxy film adhesives are shown in Fig. 9. Marked differences are noted here. The AF-44 nylon-toughened epoxy has very poor durability at any load and adhesion failure predominates. AF-126-2, the first-generation nitr ile-r ubber-f lexibilized epojiy has somewhat better durability and the failure mode is at least partially cohesive. AF-163 and AF-163-2, the second-generation-toughened epoxies, show a substantial... [Pg.635]

Sustained Load Durability Results for 177 c Cured Film Adhesives on Clad 2024T-3 Aluminum. (The metal was FPL etched, unless otherwise noted.)... [Pg.635]

Nylon-epoxy film adhesives have the tendency of picking up substantial amounts of water before use. They also tend to lose bond strength rapidly after use on exposure to water or moist air. After 18 months of exposure to 95% RH, conventional nitrile-phenolic adhesive loses only a fraction of its initial strength, going from 21 to 18 MPa in tensile shear. On the other hand, one of the best nylon-epoxy adhesives available degraded from about 34 to 6.8 MPa in just two months under the same test conditions. A considerable effort has been made to solve this moisture problem, but nitrile-epoxy or acetal-toughened epoxy film adhesives are still superior in durability. "" ... [Pg.103]

Figure 10.5 shows the data obtained on an epoxy-nitrile film adhesive on 5052-H34 aluminum alloy after immersion in hot water for 50, 100, 300, 500, and 1000 hours. This test is very useful because it permits a large number of adhesive-bonded specimens with different adhesives, adher-ends, and surface pretreatments to be tested at the same time with a relatively small investment in man hours and equipment. Figure 10.6 shows a comparison of the stressed-durability data and unstressed hot-water-soak data on the same epoxy-nitrile film adhesive, using 2024-T3 aluminum alloy. Note the parallelism of the plots. The curve in the lower left was obtained when lap-shear specimens were subjected to various levels of stress and then exposed to an environment of 60°C and 95% RH until failure. The failure time is plotted as a log function. The curve in the upper right portion is a plot of the data when the same types of lap-shear specimens were subjected to 60°C water for specified periods of time and then tested for their residual strength. In the first case, failure time was recorded. In the latter case, residual strength was determined. The same type of data is obtained with both curves. ... [Pg.246]

Figure 10.6 Comparison of stressed durability data and unstressed hot-water-soak data with epoxy-nitrile film adhesive on anodized 20242-T3 aluminum joints. ... Figure 10.6 Comparison of stressed durability data and unstressed hot-water-soak data with epoxy-nitrile film adhesive on anodized 20242-T3 aluminum joints. ...
Polyisocyanates are used with hydroxyl functional polyesters for ambient-cure two-component systems giving rise to films with an excellent combination of mechanical properties, solvent resistance, adhesion, durability and optical properties. More details can be found in Section 2.11. [Pg.63]

This mechanism has been clearly identified in the case of the durability of aluminium-alloy joints. One example [10] is that of aluminium-alloy joints bonded using an aerospace epoxy-film adhesive where the aluminium-alloy substrate was subjected to a phosphoric-acid anodising (PAA) surface treatment, but where the primer (which is normally used in such an adhesive system) was omitted. Under... [Pg.674]

Cost per gallon Spr ability Brightness Sag resistance Storage stability Dry film hardness Dry film durability Chalking properties Detergent resistance Lightfastness Scrubbability Dry film adhesion Salt resistance Blister resistance Odor... [Pg.108]

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See also in sourсe #XX -- [ Pg.358 ]



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