02 generic types grade1
Post on 03-Apr-2018
223 Views
Preview:
TRANSCRIPT
-
7/28/2019 02 Generic Types Grade1
1/34
Paint School1
Paint technology
-
7/28/2019 02 Generic Types Grade1
2/34
Paint School2
Manufacturing a paint
Paint production is a complex
production process
Here, we have simplified the
process by showing some ofthe most important steps.
Paint technology / What is paint1
-
7/28/2019 02 Generic Types Grade1
3/34
Paint School3
Paint consist of:
Binder
Colour pigments
Extenders
Solvents
Additives
-
7/28/2019 02 Generic Types Grade1
4/34
Paint School4
Hydro carbons
Composition of paints
Paints
Binder Pigments Solvents Additives
Natural Resin
Drying oil
Coal Tar
Nitrocellulose
Synthetic Resin
Alkyd
CR
Epoxy
Polyester
Polyurethane
Silicate
Vinyl
Colouring
Extender Anti-settling
Wetting agent
Inhibitive pigm.
Plasticiser
Anti-skinner
Drier
Cathodicallyprotective
Biocides
Ketones
Water
Alcohols
Esters
Ethers
-
7/28/2019 02 Generic Types Grade1
5/34
Paint School5
Generic types of paint
-
7/28/2019 02 Generic Types Grade1
6/34
Paint School6
The properties of a paint will be
decided by the binder
Three generic type of
binders are applied to test
panels: Alkyd, epoxy and
polyurethane
Exposed to sunlight,
water chemicals
Different properties are
demonstrated.
Important to select the
correct type of paint for
the purpose Paint technology / What is paint2
-
7/28/2019 02 Generic Types Grade1
7/34
Paint School7
Good application
properties
1-component
Good weather durability
Good wetting properties
Good recoatability
Good levelling properties Good gloss retention
Dry heat resistant up to
120 C.
Poor chemical resistance
(especially against
alkaline)
Limited water resistance
(submerged)
Limited solvent resistance
Limited film thickness per
coat
Poor adhesion to CR
Never to be used on Zinc
Alkyd paints
Properties
Advantages Limitations
-
7/28/2019 02 Generic Types Grade1
8/34
Paint School8
Ships
Industry
Newbuildings / Maintenance
All exterior and interior objects
Only above water
St 2 to Sa 2 or shop primedsteel
Segments
Objects
Surface preparation
Alkyd paint
Where to use
-
7/28/2019 02 Generic Types Grade1
9/34
Paint School9
Flaking of Alkyd on Zinc
1. Coat: Zinc rich coatings
2. Coat: Alkyd
Never use Alkyd on top ofZinc
Alkyd on Zinc will give
saponificationGjerde flaker
1-8
-
7/28/2019 02 Generic Types Grade1
10/34
Paint School10
Modified Alkyd paints
Styrene alkyds - Quicker drying
Silicone alkyds - better gloss retention
Urethane alkyds - Quicker drying, better water
and chemical resistance. Can be applied in thicker
coats (60-100 microns DFT)
-
7/28/2019 02 Generic Types Grade1
11/34
Paint School11
Advantages Limitations
Low solid content
Poor resistance against
strong solvents Dry heat resistant up to
approximately 80 C
Used for:
Vinyl paints
Properties
Physically drying
Good chemical resistance
Good water resistance
Quick drying
Not temperature dependent
One-component
Exterior objects above water
Offshore on top of Zinc-ethyl silicate
-
7/28/2019 02 Generic Types Grade1
12/34
Paint School12
Advantages
Higher content of
solids
Higher waterresistance
Better wetting
properties
Cost advantages
Disadvantages
Bleeding
Dark colours
Tar on cancer list
Used for:
Under water areas
Vinyl Tar - Modified type
Properties
-
7/28/2019 02 Generic Types Grade1
13/34
Paint School13
Pure Epoxy paints
-
7/28/2019 02 Generic Types Grade1
14/34
Paint School14
Part A:
Epoxy resinSolventsPigmentsExtendersAdditives
+Part B: Curing agentSolventChemical reaction
Evaporation of solvent
ResultInsoluble
3-dimensional
network
Epoxy paints
-
7/28/2019 02 Generic Types Grade1
15/34
Paint School15
Polyamides:
Normal epoxy paints
Amine and amine adduct:
Solvent free coatings
Tank coating
Isocyanates:
Low temperature curing
Reaction with -OH
Curing agents for Epoxy paints
-
7/28/2019 02 Generic Types Grade1
16/34
Paint School16
Advantages
Chemical curing
Very good chemical resistance High alkali resistance
Moderate resistance to acids
Good adhesion
Very low permeability
High mechanical strength Dry heat resistant up to 120 C
Limitations
Chalking
Temperature dependent 2 - component
Requires blast cleaning
Overcoating time
Pure Epoxy paints
Properties
-
7/28/2019 02 Generic Types Grade1
17/34
Paint School17
Pure Epoxy paints
Where to use
Ships
Offshore
Industry
New buildings / Maintenance
Chemical cargo tanks
Blast-cleaned to Sa 2 orshop primed steel
Segments
Objects
Surface preparation
-
7/28/2019 02 Generic Types Grade1
18/34
Paint School18
Modified Epoxy paints
-
7/28/2019 02 Generic Types Grade1
19/34
Paint School19
Modification of paints
We can modify a paint by replacing some of the original binderwith another, suitable binder. Examples of modified Epoxies are:
Epoxy mastic
Coal tar epoxy
Epoxy phenolic We can thereby achieve new properties, such as
Improved penetration
Better water resistance
Better chemical resistance
We will most probably also loose some of the original properties
-
7/28/2019 02 Generic Types Grade1
20/34
Paint School20
Advantages: Chemically curing
More flexible
Excellent water resistance
Better wetting properties
Dry heat resistant up to 90 C
Limitations: Dark colour
Temp. dependent
2-component
Recoating interval
Bleeding when overcoated
Coal Tar is carcinogenic
Epoxy Coal Tar
Properties
-
7/28/2019 02 Generic Types Grade1
21/34
Paint School21
Reduced chemical and solvent resistance
Reduced dry heat resistance
Increased water resistance Better wetting properties
Used for:
Submerged areas, cargo holds
and ballast tanks
Epoxy Coal Tar versus Pure Epoxy
-
7/28/2019 02 Generic Types Grade1
22/34
Paint School22
Epoxy - acrylic
Properties
Very good weather
resistance
Very good gloss retention Very good chemical
resistance
Very good solvent
resistance Cures down to 0 C
Potlife (24 timer)
2-pack
Overcoating time
Positive Limitations
-
7/28/2019 02 Generic Types Grade1
23/34
Paint School23
Epoxy - acrylic paints
Where to use
Ships
Offshore
Industry
New buildings / Maintenance Above water
Indoor and outdoor
Top coat on Epoxy, Epoxy
Mastic, Polyester glass flake
Segments
Objects
Surface preparation
-
7/28/2019 02 Generic Types Grade1
24/34
Paint School24
Epoxy Mastic paints
-
7/28/2019 02 Generic Types Grade1
25/34
Paint School25
Advantages
Chemically curing
Surface tolerant
Light colours Very good water resistance
Very good wetting properties
Good chemical resistance
High solid content
High build (Thick coats) Winter curing agent
Dry heat resistant up to 90 C
Limitations
Epoxy Mastic paints
Properties
Chalking
Temperature dependent
Not to be applied onthick coats of physically
drying paints
Minimum DFT 150 m
by airless spray
-
7/28/2019 02 Generic Types Grade1
26/34
Paint School26
Epoxy Mastic paints
Where to use
Ships
Offshore
Industry
Newbuildings / Maintenance
Ballast tanks and Cargo tanks
All exterior and interior surfaces,
above and below water
St 2 to Sa 2 or Water jetted,Magnesium descaled or shop
primed steel
Segments
Objects
Surface preparation
-
7/28/2019 02 Generic Types Grade1
27/34
Paint School27
Very good weather
resistance
Excellent glossdurability
Very good chemical
resistance
Very good solvent
resistance
Cures down to 0 C
2-pack
May cause skinirritation
Overcoating time
Polyurethane paints
Properties
Advantages Limitations
-
7/28/2019 02 Generic Types Grade1
28/34
Paint School28
Polyurethane paints
Where to use
Ships
Offshore
Industry
Newbuildings / Maintenance
All exterior substrates above
water (Also internal at times) On top of Epoxy, Epoxy Mastic
and Polyester coatings
Segments
Objects
Surface preparation
UV Light
-
7/28/2019 02 Generic Types Grade1
29/34
Paint School29
UV - Light
Gloss Retention for various paints
0
10
20
30
40
50
60
70
80
90
100
400 800 1200 1600 2200
Acrylic
PolyurethaneEpoxy
Alkyd
Gloss
Hours accelerated testing
-
7/28/2019 02 Generic Types Grade1
30/34
Paint School30
Zinc rich paints
Zi E
-
7/28/2019 02 Generic Types Grade1
31/34
Paint School31
Zinc Epoxy
Properties
Chemically curing
Good corrosion protection
Good adhesion
Require min. Sa 2
Good mechanical strength
May be recoated with all
types of paint, except Alkyd Dry heat resistant up to 120
C
Temperature dependent
2-component
Film thickness: 25 - 50 m
Not acid- and alkaline
resistant
(Resistant between pH 5-9)
Advantages Limitations
Zi E i
-
7/28/2019 02 Generic Types Grade1
32/34
Paint School32
Zinc Epoxy paints
Where to use
Ships
Offshore
Industry
Newbuildings / Maintenance
All exterior and interior objects
above and below water (as holding
primer for underwater use 20-30
microns).
Blast-cleaning to minimum Sa 2
Segments
Objects
Surface preparation
Zi Eth l ili t i t
-
7/28/2019 02 Generic Types Grade1
33/34
Paint School33
Zinc Ethyl silicate paints
Properties
Very good solvent resistance
Very high heath resistance
(max 400 oC)
Very high mechanical
strength
Very good adhesion to blast
cleaned steel
Relatively good re-
coatability
Requires humidity for
curing
2-pack
Max. DFT: 100 m
At higher DFT tendency
of mud-cracking or
checking
Advantages Limitations
Zi Eth l ili t i t
-
7/28/2019 02 Generic Types Grade1
34/34
Paint School
Zinc Ethylsilicate paints
Where to use
Ships
Offshore
Industry
Newbuildings / Maintenance
All exterior objects above the
waterline.
Tank coating and Water ballast tank
(No paint on top)
Blast-cleaning to minimum Sa 2
Segments
Objects
Surface preparation
top related