chpt1234 first half Flashcards
combining monomers with polymers
crosslinking
polymer foam
polyurethane
polymer cures by heat
thermoset
dry and react in a series of steps. the surface that is coated is turned into a coating with an electrochemica
conversion coating
volatile organic concentration . portion of the liquid coating wich evaporates into the atmosphere.
VOC
type of applications which are possible. uses seconds or krebs unit
viscosity
the degree of dispersion of the pigment in the vehicle. fine grind high gloss
fineness of grind
indicates how much of the coating must be used for the required film thickness
nonvolatile by volume
provides a measure of the solids compared to the solvent in the coating.
nonvolatile by weight
weight per gallon generally indicates something about the ingredients of the
specific gravity
pigments in the form of flakes or platelets prevents actinic rays of the sun from
metallic pigments
pigment used in primers which use the concept of inhibition
inhibitive pigments
also called extender pigment, it strengthens the film by various means
reinforcing pigment
pigment that provides the decorative characteristics of a coating
color pigment
hydrofuran and nitroparaffins
miscellaneous solvents
water
non volatile solvent
not used by industry but glycol ethers are
ethers
for highly polar binders such as phenolics ethyly alcohol
alcohols
oxygenated but have a pleasant odor butyl acetate
esters
oxygenated hydrocarbons of the acetone family
ketones
closed chain, like a ring, benzene, have a smell
aromatic
may also be called paraffins, straight chain molecule
hexane
aliphatic
binders of different types are emulsified to form a liquid binder. latex
coalescent
resin changed by heat from a solid to a liquid and back to solid again
film formation by change of phase
involves 3 reactions by ionizing the zinc
film formation by inorganic zinc
create large molecules out of smaller ones. cross linkage or catalyst. liquid resins converted to solids
film formation by polymerization
this film forms from drying oils, called triglycerides
film formation by oxidation
all the thermoplastic film formers are formed by _______ _______
film formation by solvent evaporation
materials that form a film are classified under two categories
thermoplastic and convertible
solvent evaporation, oxidation, polymerization, inorganic, change of phase, coalescent
film forming mechanisms
the corrosion at a break in the coating, growing back underneath the surface of the coating away from the break.
undercutting
ability of the coating, and the resins from which it is formulated, to resist breakdown by action to chemicals to which it is exposed.
chemical resistance
