Polyamide wax is a low molecular weight wax obtained by polycondensation reaction of dibasic acid and dibasic amine, and then a slurry obtained by low temperature activation. Polyethylene wax slurry is a pregel made from modified polyethylene wax by swelling and cooling.
The purpose of using anti-settling thixotropic additives is to easily adjust the viscosity of different fluids: for example, Newtonian fluids and pseudoplastic fluids are adjusted to thixotropic fluids, so that the coating system can have a lower viscosity during construction, which is beneficial to the coating film. Flow, after storage or spraying, it has a higher viscosity, which is convenient to prevent the sedimentation of the pigment and filler and prevent the coating film from sagging. Based on the above purpose, there are more than seven different substances on the market to change the viscosity, such as fumed silica, polyethylene wax slurry, polyamide wax slurry, bentonite, modified sesame oil, uret compound, polyurethane associative type, etc. The principle of polyethylene and polyacyl wax is further expressed as follows:
Polyethylene wax slurry is a kind of colloid, which is deflocculated by high shear force to achieve an activated and dispersed colloid state. Its advantages are to prevent hard precipitation, less influence on gloss, good viscosity stability, and little effect on temperature. sensitive
Polyamide wax is rich in hydroxyl and amide groups, which can form a strong hydrogen bond chemical force and form a network structure, thereby increasing the viscosity of the system to achieve anti-settling and anti-sagging. Each polyamide wax is intertwined to form needles When the external stress is applied, the network structure is broken into a single needle-like independent structure, and when the external stress or shear force disappears, they re-form a tangled network structure.
The difference between polyamide wax anti-settling agent and polyethylene wax anti-settling agent in application
Polyethylene wax is generally oxidized polyethylene wax, which makes the original non-polar polyethylene carry carboxyl groups, carbonyl groups, etc. to form the necessary conditions for hydrogen bonding.
However, because these hydrogen bonds are weaker than those of polyamide and the time to return to the original state is different, the performance is different.
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