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POLYVINYL HALIDE (POLY(VINYL CHLORIDE) & VINYL CHLORIDE COPOLYMERS.
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POLYVINYL HALIDE
POLY(VINYL CHLORIDE) & VINYL CHLORIDE COPOLYMERS.
1.Poly(vinyl chloride)
2.Chlorinated poly(vinyl chloride)
3.Vinyl chloride copolymers
- PVC
- soluble in solvents ~ rarely used as binder
- to significant extent in form of paste-forming PVC powders in plastisols & organosols
- both adhere poorly to metals ~ promoters
Plastisols?
- PVC dispersions in plasticizers
- contain stabilizers, extenders, pigments & processing agents
Organosols?
- contain solvent-soluble binders
- :green_cross:combined with adhesive resins ~ metals
- Film formation at (160-200 C)
- properties depends on type & amount of PVC, plasticizers, extenders.
- used in powder coatings ~ fluidized-bed coatings & electrostatic spraying
PVC, WHAT FOR?
:arrow_right: it's for corrosion protection ~metal furniture, wire, aluminium front elements for building, road marking posts
FEATURES :star:
- favorable mechanical properties
- :arrow_up:abrasion resistance
- :arrow_up:chemical resistance
- CHLORINATED POLY(VINYL CHLORIDE)
Advantages :star: :
- :+1::skin-tone-2: chemical & weather resistance.
- :+1::skin-tone-2: solubility in most conventional solvents
- VINYL CHLORIDE COPOLYMERS (VCC)
Advantages :star: :
- solubility higher than PVC homopolymer
- :+1::skin-tone-3: chemical resistance
- :arrow_down: taste & odor
Properties :
- physically drying binders
- :+1::skin-tone-3: water resistance.
- outstanding resistance to alkalis, dilute mineral acids, salt solutions, oils, fats, greases, alcohols & gasoline
FLUOROPOLYMER COATINGS
1.Coatings with Thermoplastic Fluoropolymers
2.Coatings with Amorphous Cyclic Perfluoropolymer
3.Coatings with Curable Fluoropolymers
- Thermoplastics Fluoropolymers
- Poly(vinylidene Fluoride), PVDF
- Polytetrafluoroethylene, PTFE
- Tetrafluoroethylene Copolymers, TFEC
PVDF ~ conventional thermoplastic
used : commercial product
- coil coatings of galvanized Fe & Al sheets.
- maintanence-free coating for walls
- roofing of industrial constructions
Adv :star: -
-soluble :arrow_up_small: in polar solvents
-lifetime >20 years
PTFE ~ aq dispersion produced by emulsion polymerization of TFE
Properties?
- coating is vulnerable to scratching (soft coat)
- film is tough&scratch-resistant (hard coat)
Hard coat film used in hot cooking ware ~ non-stick & easily lubricate
Adv :star: :
- :arrow_up_small: melt viscosity
- :red_cross: adhere to many substrate
TFEC - TFE-hexafluoroethylene & TFE-perfluoroalkoxyethylene (used as dispersion coatings)
Adv :star: :
- :arrow_heading_down: melt viscosity
- :arrow_heading_down: vicosity at baking temp.
TFE-ethylene's properties
- :arrow_down_small: melt viscosity
- :arrow_down_small: mp (280C)
- :+1: processability than PTFE
- electrostatic coating = thick finishes w/o pinholes that have :+1::skin-tone-4: anticorrosive&antistick characteristic
- Amorphous Cyclic Perfluoropolymer
Properties :
- solubility in specific perfluorosolvents
- :arrow_heading_up: transparency
- :arrow_heading_down: refractive index
- :arrow_down: dielectric constant
- :arrow_down_small: water absorption
Adv :star: :
- coated by various methods ~ uniform & pinholeless
- :+1:electrical&optical properties ~ enable apply to protect coat for :electric_plug: & anti reflection coat for display device
- Curable Fluoropolymes
Properties
- highly weatherable, strongly adhering, solventborne coating on metals/cellulosic materials after UV curing
Hydroxyl-containing fluoropolymer (FP)
Adv :star:
- form highly cross-linkable liquid mixtures
- can be applied at :arrow_down_small: temp.
- can be applied as an excellent scratch-resistant coating on plastic obj
FO-vinyl ether terpolymer (Lumiflon)
Characteristics : weatherability, transparency & hardness
Properties :check:
- :+1: weatherability
- room/ :arrow_up:temp cure
waterborne&solvent forms
clear, transparent films
- :arrow_up: gloss
- :arrow_down_small: refractive index
- :+1: adhesion
- :+1: mechanical properties
- :+1: chemical resistance
- easy to clean
- on-site repair & touch up
Uses :!:
- protective paints for buildings, bridges, vehicles (air, water, land), swimming pools, etc
- coil coating of metals ~ Cu, stainless steel, Al & Fe for construction and architectural deco
- paints&coatings for on-site repair of PVDF surfaces
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