The advantages and disadvantages of polyamide wax

2022-04-01   Pageview:82

It has thixotropy through the intertwining of macromolecular chains to form a network structure. When sheared, the entangled molecules are pulled apart, thereby reducing the viscosity; when the shearing stops, the macromolecules are re-entangled and the viscosity increases. Since this new winding process is relatively slow, viscosity recovery is also slower, giving the wet film longer time to flow and level without causing runaway sag.

advantage:

1. The thixotropic performance is very good;

2. Good leveling and sag resistance;

3. Small influence on gloss;

4. Not easy to thicken.

shortcoming:

1. It needs to be activated in advance when using;

2. The price is relatively high.

The thixotropic properties of polyamide wax cas no have little dependence on temperature, and it still has good anti-sagging effect at higher temperatures. Very effective rheology additive in solid coatings, metallic coatings and high build coatings.

Anti-settling thixotropic agent can impart good thixotropic properties to coatings. Under the action of high shear rate, the external force is greater than the yield value of the thixotropic value, the weak cross-linking structure is destroyed, the viscosity of the coating is very low, and the fluidity is improved, which makes the coating easy to apply; The viscosity rises with appropriate hysteresis, so that it has good leveling and sag resistance, and the final coating will return to the original thixotropic state, preventing the sedimentation and coagulation of dispersed pigment and filler particles.

For paint workers, under different systems, according to the rheological requirements of different application scenarios, it is necessary to find different thickening thixotropic agents.

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