Industrial Polymers
PLASTICS-FILMS-FIBRES-ELASTOMERS
Plastic, Man-Made Fiber
and Film Industries
Plastic Industries
Overview
• A plastic is a material that contains a polymerized
organic substance of large molecular weight as an
essential...
History
• The development of commercial phenolic resin in 1909 by
Baekland was the start of the synthetic plastic industr...
Classification
• Thermosetting plastics are processed by heat
curing to produce an infusible or insoluble
product.
• Therm...
Applications and Uses
Common Resin Types and Applications
Resin Type
Applications
Polyesters
Construction, auto repair ...
Applications and Uses
Common Resin Types and Applications
Resin Type
Applications
Epoxies
Laminates, adhesives, floorin...
Applications and Uses
Common Resin Types and Applications
Resin Type
Applications
Polyvinyl chloride
Pipe and tubing, p...
Plastics in Everyday Life
Standard Symbols
Raw Materials
• Monomers: vinyl chloride, ethylene, propylene
and similar simple hydrocarbons
• Chemical intermediates : p...
Manufacturing Processes
Bulk
Polymerization
Solution
Polymerization
• is carried out in the liquid or vapor state.
• The...
Manufacturing Processes
Suspension
Polymerization
Emulsion
Polymerization
• is the process where the monomer is suspende...
Polyethylene
• It is the first and the largest in production of
polyolefin plastic.
• High-density polyethylene (HDPE), pr...
Polyethylene
The Process Flow of LDPE Production
Individual Process Descriptions
1. Demethanization and Deethanization – The
feed for the process is a mixture of methane,
...
Individual Process Descriptions
2. Compression of Ethylene and Catalyst Ethylene and the catalyst (free-radical yielding
s...
Individual Process Descriptions
3. Solution Polymerization – In a tubular reactor
maintained at 190°C, solution polymeriza...
Individual Process Descriptions
4. Pressure Separation
– At this stage, the
unconverted ethylene is
removed and recycled.
Individual Process Descriptions
5. Extrusion and Pelletizing – The polyethylene
is extruded and pelletized.
Individual Process Descriptions
6. Quench Cooling – This hardens the
polyethylene pellets by addition of cold water.
Individual Process Descriptions
7. Water Separation and Drying – These involve
the removal of water from the pellets to
ob...
Man-Made Fiber and
Film Industries
Classification
According to Spinning Procedures
• Melt spinning involves pumping molten polymer through
capillaries or sp...
Overview
• Fibers were originally of natural origin and were
produced from wool, silk, cotton, flax, and similar
materials...
Synthetic Fibers and their
Applications
• Polyamides –They are used in home furnishings,
especially carpets.
• Acrylics an...
Vinyls and Vinylidines
• Saran is the copolymer of vinyl chloride and and
vinylidene chloride. It is resistant to mildew, ...
Other Synthetic Fibers
• Polyolefins – They excel in special cases, such as ropes,
laundy nets, carpets, blankets and back...
Multicomponent fibers
• Multicomponent fibers have been prepared
which possess superior properties to either
component if ...
Finishing and Dyeing of Textiles
• Dyeing, bleaching, printing, and special finishing (such as for crease
recovery, dimens...
Films
• are made from
different
polymers such as
polyesters,
polyvinyl chloride,
etc.
3 Common Types of Film Processing
• Slit-die process – produces flat sheets by extruding the
molten polymer through a slit...
Nylon 6.6
• Nylon 6.6 was the first all-synthetic fiber made
commercially and opened up the entire field.
• It is the prod...
PFD for Nylon Production
Raw Materials
• The raw materials for fiber production are just
the same as in plastics production and will
depend on the ...
Individual Process Description
1. Nylon Salt Formation - The reaction between equimolar proportions
of the two raw materia...
Individual Process Description
2. Evaporation – The water produced from the reaction is evaporated in an
evaporator and a ...
Individual Process Description
3. Casting Wheel – Each 900-kg batch is extruded as rapidly as possible.
• A ribbon of poly...
Individual Process
Description
4. Blender and Hopper – The ribbons are cut into
small chips or flakes, blended and emptied...
Individual Process Description
• Melt Spinning – A typical spinning unit is composed of a metal vessel
surrounded by a Dow...
Melt Spinning
Individual Process Description
6. Cold Drawing – After lubrication on
a finish roll, the yarn is stretched
or drawn to the...
THANQ Reference
Austin, G.T. Shreve’s Chemical Process
Industries (5th Ed). New York: McGrawHill, Inc., 1984.
Polymer industries
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Polymer industries

These synthetic materials have added new manufacturing methods and supplemented metals, wood and even ceramics in construction.
Published on: Mar 4, 2016
Published in: Technology      Business      Lifestyle      
Source: www.slideshare.net


Transcripts - Polymer industries

  • 1. Industrial Polymers PLASTICS-FILMS-FIBRES-ELASTOMERS
  • 2. Plastic, Man-Made Fiber and Film Industries
  • 3. Plastic Industries
  • 4. Overview • A plastic is a material that contains a polymerized organic substance of large molecular weight as an essential ingredient, is solid in its finished state, and at some stage in its manufacture or its processing into finished articles can be shaped by flow. • The plastic industries have developed and grown then, since their discovery. Plastics can be used in various applications because of their toughness, water resistance, excellent resistance to corrosion, ease of fabrication, and remarkable color range.
  • 5. History • The development of commercial phenolic resin in 1909 by Baekland was the start of the synthetic plastic industry. His discovery stimulated the search for other plastics. • The first plastic of industrial significance was cellulose nitrate (Celluloid) and was discovered about the middle of the nineteenth century. It was first used in 1869 by Hyatt who was searching for an ivory substitute.
  • 6. Classification • Thermosetting plastics are processed by heat curing to produce an infusible or insoluble product. • Thermoplastics are processed by heating to soften them and cooling to harden them. • On the basis of derivation, they may also be grouped as natural resins, cellulose derivatives, protein products, and synthetic resins.
  • 7. Applications and Uses Common Resin Types and Applications Resin Type Applications Polyesters Construction, auto repair putty, laminates, skis, fishing rods, boats and aircraft component, coatings, decorative fixtures, bottles Polyurethanes Insulation, foam inner liners for clothing, rocket fuel binders, elastomers, adhesives Polyethers Coatings, pump gears, water-meter parts, bearing surfaces, valves
  • 8. Applications and Uses Common Resin Types and Applications Resin Type Applications Epoxies Laminates, adhesives, flooring, linings, propellers, surface coatings Polyethylene Packaging films and sheets, containers, wire cable insulation, pipe, linings, coatings, molds, toys, housewares Polypropylene Housewares, medical equipment (can be sterilized), appliances, toys, electronic components, tubings and pipes, fibers and filaments, coatings
  • 9. Applications and Uses Common Resin Types and Applications Resin Type Applications Polyvinyl chloride Pipe and tubing, pipe fittings, adhesives, raincoats and baby pants, building panels Acrylics Decorative and structural panels, massive glazing domes, automotive lens systems, illuminated translucent floor tiles, windows, and canopies Polystyrene Insulation, pipe, foams, cooling towers, thin-walled containers, appliances, instruments and panels rubbers, automotive
  • 10. Plastics in Everyday Life
  • 11. Standard Symbols
  • 12. Raw Materials • Monomers: vinyl chloride, ethylene, propylene and similar simple hydrocarbons • Chemical intermediates : phenol, formaldehyde, hexamethylenetetramine, phthalic anhydride, methyl acrylate and methacrylate • Other raw materials: plasticizers, fillers, and reinforcements are also added to alter the properties of the plastic products.
  • 13. Manufacturing Processes Bulk Polymerization Solution Polymerization • is carried out in the liquid or vapor state. • The monomers and activator are mixed in a reactor and heated or cooled as needed. • is used when the exothermic heat is too great to be controlled in bulk polymerization. • The monomer and initiator are dissolved in a nonreactive solvent which serves to slow the reaction and thus moderate the heat given off.
  • 14. Manufacturing Processes Suspension Polymerization Emulsion Polymerization • is the process where the monomer is suspended in water by agitation. • stabilizers (i.e. talc, fuller’s earth, and bentonite) are added to stabilize the suspension and prevent polymer globules from adhering to each other. • is similar to suspension polymerization but the monomer is broken up into droplets that form aggregates called micelles. • The monomer is on the interior of the micelles, and the initiator is in the water. Soap or another emulsifying agent is used to stabilize the micelles.
  • 15. Polyethylene • It is the first and the largest in production of polyolefin plastic. • High-density polyethylene (HDPE), produced by low-pressure methods, is used mainly for blowmolded containers and injection-molded articles and pipe. • Low-density polyethylene (LDPE), produced by high-pressure methods, is used mainly for plastic films.
  • 16. Polyethylene
  • 17. The Process Flow of LDPE Production
  • 18. Individual Process Descriptions 1. Demethanization and Deethanization – The feed for the process is a mixture of methane, ethane, and ethylene. Since ethylene is the monomer to be used ethylene has to be separated from methane and ethane. High purity ethylene is used (99.8%).
  • 19. Individual Process Descriptions 2. Compression of Ethylene and Catalyst Ethylene and the catalyst (free-radical yielding such as oxygen or peroxide) are compressed to operating pressure (150 MPa).
  • 20. Individual Process Descriptions 3. Solution Polymerization – In a tubular reactor maintained at 190°C, solution polymerization occurs to convert ethylene to polyethylene. About 30% conversion is achieved per pass.
  • 21. Individual Process Descriptions 4. Pressure Separation – At this stage, the unconverted ethylene is removed and recycled.
  • 22. Individual Process Descriptions 5. Extrusion and Pelletizing – The polyethylene is extruded and pelletized.
  • 23. Individual Process Descriptions 6. Quench Cooling – This hardens the polyethylene pellets by addition of cold water.
  • 24. Individual Process Descriptions 7. Water Separation and Drying – These involve the removal of water from the pellets to obtain the final product.
  • 25. Man-Made Fiber and Film Industries
  • 26. Classification According to Spinning Procedures • Melt spinning involves pumping molten polymer through capillaries or spinnerets and the polymer streams that emerge are solidified by quenching in cool air. • In dry spinning, the polymer is dissolved in a suitable organic solvent. The solution is forced through spinnerets and dry filaments are formed upon evaporation of the solvent. • Wet spinning involves spinning of a solution of polymer and coagulation of the fiber in a chemical bath.
  • 27. Overview • Fibers were originally of natural origin and were produced from wool, silk, cotton, flax, and similar materials. • The first man-made fibers were made by Swan in 1883 when he squirted a solution of cellulose nitrate in acetic acid through holes. • Fibers have three important general properties: length, crimp and denier.
  • 28. Synthetic Fibers and their Applications • Polyamides –They are used in home furnishings, especially carpets. • Acrylics and Modacrylics – polyacrylonitrile is the major component of several industrial textile fibers. • Spandex – It is used in foundation garments, hose, swimwear and other elastic products.
  • 29. Vinyls and Vinylidines • Saran is the copolymer of vinyl chloride and and vinylidene chloride. It is resistant to mildew, bacterial and insect attack. Automobile seat covers and home upholstery are its prime applications. • Vinyon is the trade name of copolymers of 90% vinyl chloride and 10% vinyl acetate. Resistance to acids and alkalies, sunlight, and aging makes Vinyon useful in heat-sealing fabrics and clothing.
  • 30. Other Synthetic Fibers • Polyolefins – They excel in special cases, such as ropes, laundy nets, carpets, blankets and backing for tuffed carpets, but are difficult to dye and their melting point is low. • Fluorocarbons – It is widely used in pump packings and shaft bearings. • Glass Fibers – are used for electrical insulation in motors and generators, structural reinforcement of plastics, fire-proof wall coverings and tire cords.
  • 31. Multicomponent fibers • Multicomponent fibers have been prepared which possess superior properties to either component if spun alone. They correspond to better dyeability, permanent crimp, or silklike feel, etc.
  • 32. Finishing and Dyeing of Textiles • Dyeing, bleaching, printing, and special finishing (such as for crease recovery, dimensional stability, resistance to microbial attack and ultraviolet light) involve unit operations such as filtering, heating, cooling, evaporation and mixing.
  • 33. Films • are made from different polymers such as polyesters, polyvinyl chloride, etc.
  • 34. 3 Common Types of Film Processing • Slit-die process – produces flat sheets by extruding the molten polymer through a slit-die into a quenching water bath or onto a chilled roller. • Blow-extrusion Process – produces tubular film by using air pressure to force the molten polymer around a mandrel. • Calendering – preparation of film is produced by feeding a plastic mix of polymer, stabilizer, and plasticizers between two heated roll where it is squeezed into a film.
  • 35. Nylon 6.6 • Nylon 6.6 was the first all-synthetic fiber made commercially and opened up the entire field. • It is the product resulting from the polymerization of adipic acid and hexamethylene diamine.
  • 36. PFD for Nylon Production
  • 37. Raw Materials • The raw materials for fiber production are just the same as in plastics production and will depend on the type of material the fiber is made up of. • For the production of nylon yarn, however, the raw materials cited are adipic acid and hexamethylene diamine (“hexa”). • Utilities such as steam and water will also be used.
  • 38. Individual Process Description 1. Nylon Salt Formation - The reaction between equimolar proportions of the two raw materials produces nylon salt solution. Acetic acid is added to the (“hexa”) to to stabilize chain length.
  • 39. Individual Process Description 2. Evaporation – The water produced from the reaction is evaporated in an evaporator and a jacketed autoclave. • In the jacketed autoclave, pure nitrogen at 175-345 kPa forces the material downward. TiO2 dispersion is also added.
  • 40. Individual Process Description 3. Casting Wheel – Each 900-kg batch is extruded as rapidly as possible. • A ribbon of polymer about 30 cm wide and 6 mm thick flows on the 1.8-m cat drum. • Water sprays on the inside cools and harden the underside of the ribbon, the outer is cooled by air and water.
  • 41. Individual Process Description 4. Blender and Hopper – The ribbons are cut into small chips or flakes, blended and emptied to hoppers.
  • 42. Individual Process Description • Melt Spinning – A typical spinning unit is composed of a metal vessel surrounded by a Dowtherm vapor heated jacket which keeps the temperature of the vessel above melting temperature (263°C). • As the nylon flake enters the vessel, it strikes a grid, where it melts and flows through to the melt chamber below. • The molten polymer passes through the portholes in this chamber to gear spinning pump. • They deliver it to a sand filter, which is followed by screens and a spinneret plate. • The filaments are solidified by air and passed in a bundle through steamhumidifying chamber.
  • 43. Melt Spinning
  • 44. Individual Process Description 6. Cold Drawing – After lubrication on a finish roll, the yarn is stretched or drawn to the desired degree. 7. Bobbin – The nylon yarn passes through a bobbin system and is shipped to various manufacturers for processing.
  • 45. THANQ Reference Austin, G.T. Shreve’s Chemical Process Industries (5th Ed). New York: McGrawHill, Inc., 1984.

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