The Difference In Epoxy Soy Oil Content Makes The Bond Strength Different
Since the epoxidized soybean oil improves the crosslinking degree of the polyurethane molecular chain, the cohesive force is correspondingly increased, thereby improving the bonding strength of the adhesive; however, as the amount of the epoxidized soybean oil is increased, the prepolymer is difficult to be emulsified, and the stability of the emulsion is stabilized. Decreased, resulting in a decrease in the bond strength of the polyurethane adhesive. On the other hand, the addition of epoxidized soybean oil reduces the viscosity of the aqueous polyurethane adhesive, which is beneficial to the wetting of the substrate by the adhesive, and also improves the bonding strength of the aqueous polyurethane adhesive.
As can be seen from the above description, when the epoxy soybean oil content is 4% to 6%, the polyurethane adhesive has better bonding ability. In order to ensure that the composite film is not delaminated, the peel strength of the interlayer adhesion shall not be less than 100 N/m. When the amount of epoxy soybean oil is 4% to 6%, the peeling strength of the water-based polyurethane adhesive on different films is more than 100N/m, indicating that the adhesive can be used for bonding various composite film materials.
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