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General
- An adhesive is a
compound that adheres or bonds two items together.
- Adhesives may
come from either natural or synthetic sources.
- Adhesives,
from inorganic mineral sources, or biological sources such as
vegetable matter, starch (dextrin),
natural resins, animal skin, and bioadhesives
- Contact adhesive
is one which must be applied to both surfaces and allowed some time
to dry before the two surfaces are pushed together.
- Adhesives based
on elastomers, thermoplastic, and thermosetting adhesives.
Process
- Phenol (C6H50H),
the primary component of the resin used for the wood adhesives, is
made from petroleum.
- In making
adhesives and plastics from wood waste or other biomass uses solvent
lo exlraci and concentrale a phenolics and neutrals traction lrom
the pyrolysis oil.
- Ultrasonic energy
process is used to cure a structural adhesive used to bond two
pieces of 2024-T3 aluminum. Ultrasonic energy is absorbed by the
adhesive and is converted to heat.
Applications
- Cold-applied
systems are waterproofing or roofing applications that utilize a
cold adhesive (solvent-based or water-based) in the adherence or
fusion of the roof system.
- Insul-Lock II™
insulation adhesive is a one-part, easy-to-apply, solvent-free,
asphalt-free urethane. It quickly creates a strong bond with a
variety of insulations and deck types, and requires no special
application equipment.
- The main
advantages of adhesive bonding are threefold: adhesives provide a
continuous bond, with uniform distribution of load over wide areas;
adhesives can bond irregularly shaped surfaces; and adhesive bonds
are more resilient to stress and mechanical vibrations.
Technology
- Micro adhesive
bonding technology can be used for the assembly of microparts. But
the properties of adhesives in small dimension can be totally
different to those in classical macroscopic dimensions.
- A thermal
technique called laser-based microwelding, can be employed in the
joining of microdevices, such as stainless-steel catheters and
stents
Market
- Over 2.5 million
tons of pressure sensitive adhesives (PSAs) are annually produced in
the world.
- The estimated
total U.S. market alone for adhesives is about $10 billion dollars.
PSAs are commonly used in products such as labels, tapes,
removable note pads and self-adhesive postage stamps.
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Pressure-sensitive adhesives represent the third largest global
market segment in size and in expected demand growth. This segment
is growing at an annual rate about 10% higher than the average for
the total global adhesives and sealants market.
- The global
presentation identifies the Pressure Sensitive Adhesives demand in
the USA, Western Europe and Japan which, when combined, represents
about 80% of the world market place.
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