Abstract
In polyurethane resin systems, Anjikon dispersant was selected to disperse titanium dioxide and carbon black for evaluation experiments. The dispersant's effectiveness was assessed by observing paste viscosity, scraper finger rub color difference, and floating pigments in the can. Polyurethane resin, titanium dioxide, and carbon black were ground into color paste, formulated into paint, and observed. Coatings prepared with Anjikon dispersant exhibited a ΔE ≤ 0.3 color difference after 7 days of static storage at 60°C, with no floating color observed in the can.
Keywords: dispersant, finger rub color difference
1. Experiment Objective
Compare dispersants provided by suppliers to select those with superior viscosity reduction and anti-floating color properties.
2. Experimental Procedure
Apply dispersants to polyurethane resin systems, grind color pastes, observe paste consistency, formulate paint, and conduct finger rub tests on scrapers to evaluate color differences.
3. Results and Discussion
3.1 procedure
Prepare color paste according to the formulation in Table 1 below. After grinding, filter out glass beads, perform finger rubbing with a scraper, and test the color difference of the rubbed area using a color difference meter. Place the paste in a 60°C oven for 24 hours for observation.
Prepare black and white monochrome color pastes according to Table 1. After grinding, test viscosity and color development.
Prepare gray paint according to Table 2. Perform finger rubbing with a scraper and test the color difference of the finger-rubbed section using a color difference meter. Place the paste in a 60°C oven for 7 days for observation.
3.2 Performance Testing
3.2.1 Experimental Formulations
Black and White Monochrome Formula
| |
White Paste |
Black Paste |
Remarks |
| Polyurethane Resin |
10 |
10 |
PU-5335 |
| solvent |
23.5 |
63 |
DMF |
| dispersant |
1.5 |
2 |
|
| Titanium Dioxide |
65 |
|
Lomon R996 |
| Carbon Black |
|
25 |
Zhihua C311 |
| Total |
100 |
100 |
|
Prepare the slurry according to the formula in the table above. Add glass beads (particle size 3 mm) equivalent to 1.2 times the slurry mass. Place the mixture in a shaker and grind to a fineness of ≤ 5 μm.
Black and White Monochrome Paint Formulation
| |
Amount |
Remarks |
| Polyurethane Resin |
45 |
PU-5335 |
| solvent |
15 |
DMF |
| White Paste |
36 |
|
| Black Paste |
4 |
|
| Total |
100 |
|
Mix thoroughly according to the table above to prepare the gray paint.
3.2.3 Experimental Results and Discussion
Color Paste Comparison
| mpa.s（25℃） |
White Paste |
Black Paste |
| |
Sample 1 |
AJK
6150
|
Sample 2 |
AJK
6130
|
| Initial Viscosity |
1300 |
1320 |
2350 |
2400 |
| Initial Fineness |
≤ 5 μm |
≤ 5 μm |
≤ 5 μm |
≤ 5 μm |
Anjeka dispersant exhibits nearly identical viscosity reduction properties to the sample dispersant. When used with white paste, Anjeka dispersant yields a brighter white hue, while with black paste, it produces a deeper black color.
60°C*7 days
Scraper finger comparison:
| ∆E |
Sample 1 White Paste+
Sample 2 Black Paste
|
AJK 6150 White Paste+
AJK 6130 Black Paste
|
| Initial Finger-Pressed Color Difference |
0.28 |
0.17 |
| Heat Storage Finger-Pressed Color Difference |
0.5 |
0.3 |
| Color Difference Before and After Heat Storage |
0.4 |
0.1 |
Initial Finger Research Post-Heat Storage Finger Research
Anjeka dispersant exhibits minimal color difference in both finger rub and heat storage tests compared to the sample.
Anjekon Dispersant Sample Dispersant
No floating color Slight floating black
4. Conclusions
Testing demonstrated that in polyurethane resin systems, white paste prepared using Anjeka 6150 dispersant and black paste prepared using Anjeka 6130 exhibit excellent viscosity reduction properties and stability against color floating.
Uw bericht moet tussen de 20-3.000 tekens bevatten!