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Transcript of Chem 151
- As the data suggests, the amount of linseed oil added increased, it in turn affected both the paint consistency and drying time. Drying time increased as the amount of linseed increased and the paint consistency became more like a grainy liquid rather than a consistent paint thickness.
- From the data, the most ideal paint for proper paint consistency and fast drying time is the paint formulation with four drops of linseed oil added to the hexane and paint pigment.
-By testing on a small scale, the results for drying time and paint consistency may be slightly different thus producing less desired paint properties.
The main goal of this lab was to develop one or more paint formulations that give improved performance and/or expand the range of possible art applications.
Also, the goal of the resulting paint prepared needs to have a potential market and the projected material cost permitting competitive pricing
- Synthetic inorganic pigments can be used to make paint, and can often be easier to use than taking materials straight from the Earth because they can be chemically processed and mass produced.
-The goal of paint manufacturing companies is to distinguish its brand by offering artist paints with superior performance properties at competitive prices.
-The goal of this experiment is to develop a paint formulation that provides improved performance and possibly expanded range of application for different arts.
- In this experiment, we made Prussian Blue paint which was made with Iron (III) Chloride and Potassium Ferricyanide pigment, and the properties of the paint are conveniently
and economically tested on a small scale to be
efficient and predict the behavior of the paint
beyond the range of conditions tested.
-Preparing the pigment-
-Begin by dissolving .56 grams of Iron (III) chloride into just enough water for the solid to dissolve.
-In a separate beaker, dissolve .57 grams of Potassium ferricyanide into just enough water for the solid to dissolve.
-Combine the two inorganic pigment solutions:
4FeCl3(aq) + 3K4[Fe(CN)6](aq)→→ Fe4[Fe(CN)6]3 +12KCl
(Having the pigments dissolve in the smallest amount of water will allow for a stronger pigment to be effectively produced when vacuum filtration is used.)
*This will yield a Prussian blue pigment*
- Use vacuum filtration to separate the precipitate from
- Pour the Prussian Blue solution into the
- Give the solution sufficient time to filter
fully (This should be around 10 min.)
- Separate the solid and leave on a glass plate
overnight to ensure all the excess liquid has
evaporated off the solid (the pigments should be a fine powder-like solid)
-To begin making the paint, finely crush the solid dry pigment using a mortar and pestle
(by crushing the pigment
into a fine powder, this
will allow it to dissolve
more readily in the vehicle
and solvent to make the paint)
-Making the Paint-
- Separate the pigment into three amounts and place into separate beakers each with the same amount of pigment (.045 grams)
In this experiment, the paint consistency changed from thick and grainy to liquidy and grainy as more linseed oil was added
The amount of time needed for the paint to dry increased as the amount of linseed oil increased
- Add .5 ml of Hexane to each beaker and vigorously stir until the pigment is dissolved into the Hexane
- Add 3 drops of linseed oil to beaker 1
- Add 4 drops of linseed oil to beaker 2
- Add 5 drops of linseed oil to beaker 3
-Testing the Paint-
- Streak paint onto brown paper
(by doing this, the properties of the paint can be tested on this surface specifically with the varying amounts of linseed oil)
- Record dry time and solid consistency
(these properties are effected by the amount of linseed oil that is mixed into the pigment and binder)
1 min 7 sec
1 min 26 sec
2 min 3 sec
How do we design, prepare and evaluate paint that has superior performance qualities and be sold at a competitive price?
Paint is a complex mixture of four major components: pigment, vehicle, solvent and additives which impact the desired properties of that paint
Pigments give the paint its color, Vehicles make up the bulk of the paint controlling much of the paint's properties, the solvent is a volatile substance that helps solubilize the vehicle and pigment and additives can be included which also impacts the properties of the paint
Most of these inorganic pigments are light colored to begin with, then when mixed can make very bold colors.
-Amount of Linseed oil
(changing the solvent of the solution will impact paint properties like drying time and paint consistency)
-Weight of pigment
-Test Surface (Brown Paper)
- In future experiments, a larger quantity of paint should be produced and tested for these properties on more than one surface to fully analyze the potential applicable surfaces that the paint works effectively on.
-This in turn would either validate the results gathered or invalidate them.