Protective coating
a technology of protective coating and film, applied in the direction of temporary coating, cellulose derivative coating, starch coating, etc., can solve the problems of inter alia water resistance destruction of the film properties of the coating
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example 1
[0045] To an aqueous solution containing 0.375% (w / v) of locust bean gum and 1.125% (w / v) of guar gum was added Lupasol SK, MW 2000 000 (BASF), to give a final concentration of 1.8% (w / v). The mixture was thoroughly mixed and the pH adjusted to 8. The resulting viscous solution was applied to lacquered test plates (0.5 L / m2).
[0046] Three methods of drying were used: [0047] 1. Forced drying in an oven at 70° C. for 20 min. [0048] 2. Forced drying using infrared heater for 10 min. [0049] 3. Drying in room temperature for 20 hrs.
[0050] The coating dried at elevated temperatures (1 and 2) and became very tough and were scratch resistant.
[0051] Showering the coatings with water at room temperature for 1 hour resulted in some swelling of the coatings (most apparent on the coating dried by method 3. but the coatings were essentially resistant to this water exposure at room temperature.
[0052] The coatings were tested according to test recommendations from Volvo AB including test with 1%...
example 2
[0054] The galactomannans guar gum and locust bean gum in the proportions 75:25 (w / w) were dissolved in water (2.2% at 90° C. and allowed to cool to 40° C. To the resulting solution was added polyethylenimine, Lupasol P, MW 750 000 (BASF) in a concentration of 3.6% (w / v). After careful mixing, the pH was adjusted to 8.0 by the addition of acetic acid. The resulting solution was sprayed on a lacquered metal surface (0.3 l / m2) and allowed to dry. During the drying process the solution changed into gel before forming a film. Using the experimental procedure as in Example 1 similar results were obtained.
example 3
[0055] To an aqueous solution of 1.5% (w / v) of locust bean gum was added Lupasol P to a final concentration of 1.2% (w / v) and the mixture was thoroughly mixed. The pH of the solution was adjusted to 12. The resulting solution was applied to solution to lacquered test plates (0.25 L / m2) and immersed into coastal waters at the East and West Coast of Sweden. After 3 months the test plates were inspected for barnacle and algae growth and it was found that the growth of these organisms was significantly reduced. The dirt that had accumulated and the coating could easily be removed by high-pressure water.
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