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| Reactive Hot Melt Adhesives |
| Reactive hot melt adhesives combine the speed of hot melts with the strength of structural thermosetting adhesives.
Because reactive hot melts are applied like traditional hot melts, they require no mixing, and have excellent initial handling strength over traditional thermosetting adhesives.
Best of all, theyíre solvent free. These adhesives are cured by a reaction with water. In most cases, sufficient moisture already exists in the air or in the materials being bonded. These one-component adhesive systems form semi-structural bonds on a variety of substrates, including non-porous materials. Like other thermosetting adhesives, reactive hot melts provide lasting bonds. They produce extremely durable, highly elastic bonds that perform well in temperature extremes |
| One-Part Liquid Moisture Cure Adhesives (LMCs) |
| One-part Liquid Moisture Cure adhesives (LMCs) also form permanent bonds by a chemical reaction with moisture from the substrate or environment.
These products are liquid at room temperature, as such, parts bonded with LMCís require fixturing during cure.
These one-component adhesive systems form structural bonds on a variety of substrates, including non-porous materials.
They are especially good for wood-to-wood bonding. Like other thermosetting adhesives, they provide lasting bonds.
They produce extremely durable, highly elastic bonds that perform well in temperature extremes. |
| One-Part Heat Cured Polyurethane |
| One-part Heat Cured Polyurethane these adhesives require heat to complete the chemical reaction.
H.B. Fuller markets these adhesives under the AccuthaneÆ brand name. This thermosetting technology is based on two-part polyurethane technology in a one part form.
The polyol is a solid component dispersed in a liquid isocyanate.
Under heat the solid polyol melts and reacts with the isocyanate.
An alternative manufacturing processes to traditional two-part urethane systems, these adhesives, like reactive hot melts, require no premixing of the adhesive.
They typically require heat of 250 to 300ƒ F for 15 to 45 minutes, to cure.
Accuthane products have very good solvent resistance and are used on metals and other substrates that can withstand the curing temperatures.
They are typically used when the performance of a two-part polyurethane is required, but the ease of a one-part system is desired. |
| Two-Part Polyurethane |
| Two-part Polyurethane adhesives are used for structural bonding of engineering plastics, fabrics, wood and metals.
Two-part polyurethanes are packages in two containers: an A part or polyol and a B part or isocyanate.
The two parts are mixed, either mechanically or by hand.
Upon mixing a chemical reaction takes place to form the crosslinked adhesive.
These can be applied at room temperature and do not need heat or moisture to cure.
Handling strength and cure rates can range from a few seconds to 12 hours depending on the adhesive and environmental conditions. |
| Epoxies |
| Epoxies are primarily used for bonding metals and wood in structurally demanding applications.
They typically have better heat and chemical resistance than polyurethanes but are not as versatile in their curing characteristics.
Some of the largest structural bonding applications for epoxies include automotive metals (hoods and doors),
aerospace composites, batteries, electrical components, paint rollers, hardware and sporting goods. Epoxies for structural bonding fall into two categories. Two-Part Epoxies One-part adhesives require heat to cure and form a bond. Typical oven bake times are 30 to 60 minutes at 350 to 400ƒ F. Handling strength can be achieved rapidly with the use of induction cure, 6 seconds at 325 to 425ƒ F, but must be followed by an oven bake to reach full cure in most cases. One-Part Epoxies One-part adhesives require heat to cure and form a bond. Typical oven bake times are 30 to 60 minutes at 350 to 400ƒ F. Handling strength can be achieved rapidly with the use of induction cure, 6 seconds at 325 to 425ƒ F, but must be followed by an oven bake to reach full cure in most cases. |
| Polysulfides |
| Polysulfides are two part adhesives and sealants used when low temperature flexibility and solvent or fuel resistance is required.
Their cure times are similar to polyurethanes but have lower structural strength when fully cured.
Some of the larger applications for polysulfides include aerospace sealants and semi trailers. |
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