Polyurethane water remover
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Polyurethane water remover
The isocyanate in the curing agent component of polyurethane glue In the state, it reacts with water to form unstable carbamic acid first, but It is then decomposed into carbon dioxide by carbamate. The presence of carbon dioxide,Causes bubbles to appear on the bonding surface, reducing the surface area of the glue and the substrate
Low, and reduce the cohesion of the adhesive, reduce the bonding strength of the adhesive degree.
Especially the adhesive bonding between large-area plates
At this time, the generation of air bubbles will cause the plate to bulge and affect the bonding quality Volume, and due to the presence of trace moisture, the polyurethane glue The service life is greatly shortened.
In order to solve the problem of polyurethane foaming phenomenon and short pot life, water and carbon dioxide inhibitors need to be added to polyurethane resin.
In terms of foaming inhibition mechanism, there are two types of foaming inhibitors, one is dehydrating agent, and the other is carbon dioxide absorbent.
Zeolite molecular sieve is a commonly used and efficient water and carbon dioxide absorbent.
Because molecular sieve has the dual functions of dehydration and carbon dioxide absorption, molecular sieve is an ideal inhibitor of polyurethane adhesive water and carbon dioxide.
