The synthetic thermoplastic known as Nylon was created in 1935 and initially used as a fabric at the New York World's Fair in 1939. You may also find references to Nylon using the chemical abbreviation "PA." It is frequently offered in black, white, and off-white, which is also its natural hue or beige. The raw material for injection molding, fibers, filaments, sheet stock, and films can all be made from Nylon. Wallace Carothers, a research chemist with DuPont, invented nylon bushings. His invention became known as Nylon 66, which is still one of the most widely used varieties of Nylon today. Other forms, nevertheless, with various repeating monomer groups, may give improved characteristics.
The Many Uses of Nylon
Injection molding uses Nylon in a huge range of different applications.
They consist of:
- automobile
parts
- bushings,
plastic bearings, and gears
- Points
of impact on furniture
- Sports
equipment
Nylon is particularly useful in parts that come into contact with
various substances. Additionally, it performs well in components that must
maintain strength and withstand heavy wear.
Remarkable Characteristics of Nylon
Numerous characteristics of Nylon make it popular in plastic injection
molding. Examples include:
- very
powerful
- easy
to clean and resistant to many chemicals
- elastic
and tough
- resistive
to heat (a very high melting point of 220 degrees Celsius, though it is
flammable when exposed to open flame)
- Low
friction and resistant to abrasion
Nylon is a wonderful contender for replacing metal because it may even
be used in place of low-strength metals. To increase tensile and flexural
strength, glass fibers are frequently used. Additional additions can enhance a
material's flammability, impact, and electrical resistance. The strength of
Nylon can also be increased by "conditioning," which involves
reintroducing moisture into the plastic after molding to increase flexibility
and strength.
Moulded Nylon Bushings: Four Quick Facts
1. Nylon Bushings: Surface Characteristics
Since nylon bushings are self-lubricating, no further lubrication is
necessary. They are practically zero-maintenance bushings as a result.
Additionally, they have a very low coefficient of friction. They are
non-galling and have a Rockwell hardness value of about 80 D.
2. Nylon Bushings: Performance and Strength
Non-reinforced Nylon bushings have a PV (pressure-velocity) value of
3000 ft/min/psi. The tensile, compressive, and flexural strengths of
unreinforced Nylon are 12 ksi, 15 ksi, and about 15 ksi, respectively.
Additionally, compared to their metal counterparts, they are incredibly
lightweight.
3. Environmental Aspects of Nylon Bushings
Molded nylon bearings operate at a constant temperature of about 250°F.
Their adaptation to cryogenic conditions is poor. Nylon has an extremely low
coefficient of thermal expansion—5.510-5in/in/°F—which shows that it maintains
its dimensions even when exposed to large temperature swings. The hygroscopic
characteristic of nylons must be considered in design since its usual moisture
absorption rate ranges from 3–7%.
4. Chemical Compatibility of Nylon Bushings
Nylon has good chemical resistance to weak acids, alkalis, organic
solvents, and most fuels. In the presence of alcohols and hydrocarbons, several
varieties of Nylon function exceptionally well. Strong acids are their greatest
vulnerability.
With a maximum continuous operating temperature of about 250°F, nylon bushings are
dimensionally stable. Numerous engineers who wanted to save weight and money
while retaining dependable performance have chosen them because of their wide
range of chemical resistance.
No comments:
Post a Comment