Micronized polyethylene wax for improving the surface properties of various solvent-based paints, powder coatings and printing inks, improving scratch resistance and surface slip. Particularly suitable for baking systems.
Composition: Teflon micronized polyethylene powder
Density: 2.28 g/ml
Particle size distribution (laser diffraction, volume distribution).
D50: 3 microns
D90: 6 microns
Offered as: micronized powder
The slurry added with the colloidal modifier has good color development, the pigment is more uniformly dispersed, and the prepared slurry is brighter, while the pigment slurry without the colloidal modifier is dark.
The slurry added with colloidal modifier has a certain degree of thixotropy, and the viscosity is higher when placed at rest, which can prevent sedimentation. When subjected to shearing, the viscosity drops a lot, and it has good flow and leveling properties.
The addition amount of the colloidal modifier should not be too much. Excessive amount will easily lead to the production of foam and cause the difficulty of defoaming. Therefore, it is necessary to determine the best dosage according to experiments, generally between 0.4% and 1%. It should be noted that more than 0.8% will make defoaming difficult, especially the elimination of microbubbles. Therefore, to make a complete set of formulas, it is more important to select defoamers that match the colloidal modifiers.
Both latex paints have better performance.
In short, there are many additives used in latex paint, which should be considered in a comprehensive and balanced manner to maximize its positive effects and minimize its negative effects to achieve the goal of reducing costs and improving performance.
Examples of formulations using colloidal modifiers and pure associative thickeners to prepare high-solids and low-viscosity coatings. First determine the amount of colloidal modifier, and then use the gradient method to determine the amount of associative thickener. Usually the associative thickener is within a certain dosage range, and the thickening system is not within the range of the bridge frame flocculation and volume limit flocculation, and the paint has a good appearance.
The amount of colloidal modifier is determined: according to the above formula, disperse the pigments, fillers, and water into them. In addition to H-34, put the materials in proportion, and then add a certain amount (0.1g, 0.2g, 0.3g, 0.4g, 0.5g, 0.6g, 0.7g) H-34, dispersed at 2000r/min for 5min, and tested the viscosity of 12r/min.
Make H-34 dispersion curve graph 2870015, the lowest point of dispersion viscosity is 6000.25, take the value according to the lowest point of dispersion curve 5001.5~3 times, Hy-400 in the formula
The dosage of 300drop al at 34 (H-34) is 2000.7 parts.
Use gradient method to determine associative increase 0
0.20.40.608 Thickener dosage: use the associative thickening H-34 adding amount/agent gradient method to let down the paint, and the storage performance of the dispersion curve of H-34 of several coatings in Figure 28-15H-34 is shown in Table 28-17. Accordingly
Table, the amount of associative thickener can be 0.4~0.8, 0.6 is better.
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