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Author: Subject: Woodpaint
lipiman
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sad.gif posted on 13-11-2005 at 21:55
Woodpaint


Hi there, right now I want to make a woodpaint or metalpaint. Does anyone know how to make them?

Thanks.
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DrP
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[*] posted on 14-11-2005 at 01:32


What's the application (internal / external; decorative / protective)? - how much do you need to make? Do you want it to be waterbased or solvent based?

Paints are essentially a polymer binder, pigment, inert inexpensive filler and some dispersing agents (surfactants) with maybe some biocide. You can then add things for rust prevention, fire protection , anti graffiti etc...
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lipiman
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[*] posted on 14-11-2005 at 03:43
Woodpaint composition and how to make


I want to know the composition and ingredients for making a woodpaint? Thanks.

Quote:
Originally posted by DrP
What's the application (internal / external; decorative / protective)? - how much do you need to make? Do you want it to be waterbased or solvent based?

Paints are essentially a polymer binder, pigment, inert inexpensive filler and some dispersing agents (surfactants) with maybe some biocide. You can then add things for rust prevention, fire protection , anti graffiti etc...
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DrP
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[*] posted on 14-11-2005 at 06:10


For a waterbased basic white formulation try:

75% Acrylic Binder in water emulsion (50%)
15 - 20 % TiO2 pigment
2% dispersing agent (commercial one for TiO2)
Maybe some Glycol as antifreeze - 0.5 -2 %
0.2% commercial biocide if shelf life is required.
aprox 1% (to the required thickness)thickening agent (high MW acrylic resin, celluose or std commercially available thickening agent)


For better resiliance externally try an Alkyd resin. Here is an idea for a start formulation:

~ 80% Alkyd resin (50 % emulsion in water)
~19% TiO2 (white pigment - finely ground)
~ 0.5 to 2 % standard commercial dispersing agent
Maybe some antifreeze ~ 0.5%
Maybe some cobalt based drying agent if curing times are important (loads of commercially available ones)
Thickner (of your choise) - amount depends on thickness required.


If this is just for a one off job/experiment then you could get away with the bare minimum of the following stirred well:

Aprox 80% Binder (acrylic or alkyd dispersion in water)
20% TiO2 pigment



In all cases:
The standard way to mix these is by
1)addind the pigment with a small amount of the binder or water and mixing into a thick paste (mill stage)
2) mix in the surfactants and additives
3) gradually add the rest of the binder/liquid with high stirring (Let down)
4) thicken to required viscosity with your chosen thickening agent.


Hope this helps.

[Edited on 14-11-2005 by DrP]
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