Update:Polyurea spray: It is an elastomer substance produced by the reaction of isocyanate component and amino compound compone...
Polyurea spray: It is an elastomer substance produced by the reaction of isocyanate component and amino compound component. ZHEJIANG RUICO ADVANCED MATERIALS CO., LTD. introduces the primer treatment methods of polyurea spraying.
Isocyanates can be aromatic or aliphatic. Among them, the A component of the polyurea spray can be monomers, polymers, isocyanate derivatives, prepolymers and semi-prepolymers. Prepolymers and semi-prepolymers are prepared by reacting amino-terminated or hydroxyl-terminated compounds with isocyanates.
The R component of polyurea spraying must be composed of amino-terminated resin and amino-terminated chain extender. The amino-terminated resin must not contain any hydroxyl components and catalysts, but can contain additives that facilitate pigment dispersion.
Generally, substrate treatment is the key to ensuring the quality of polyurea spraying construction, which can be divided into metal substrates and concrete substrates. Here is how to deal with polyurea spray substrate
Metal substrate treatment: first sandblast the substrate to Sa2.5 level, and level the defective parts such as welds with epoxy putty, so that the entire substrate can be sprayed with polyurea to make the transition smooth, etc. Use an angle grinder after the epoxy putty is cured Smooth, then clean the substrate, roll or brush two matching primers.
Polyurea sprayed concrete substrate treatment: Shot blasting of precast concrete or using angle grinders and high-pressure water guns to remove dust and scum on the surface.
After the substrate is completely dry, use the caulking material to level the surface. The caulking part needs to be smoothed with an angle grinder after the caulking material is solidified. Then remove the dirt on the surface by brushing or rolling a matching primer for later use. The longest interval between primer recoating is 24 hours and the shortest is 3 hours.
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