so that the macromolecular crosslinked

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so that the macromolecular crosslinked.Indicate that the aqueous polyurethane adhesive, because the adhesive has more polar groups, such as urethane bond, urea bond, ionic bond, etc.,Cheap Nike Heels, and therefore a number of synthetic materials, particularly polar materials, porous materials have good adhesive properties, mainly by the physical interaction between the adhesive layer and the adherend and obtain excellent bonding effect. Nike Trainers, Compared with the solvent-based polyurethane adhesive, aqueous polyurethane adhesive of the solvent volatilization slower and needs a longer drying time and a higher temperature, and the surface tension of water, and poor wetting ability of the hydrophobic substrate, in large The disadvantage of part of the water yet volatile or porous substrate absorption suddenly heated dry, not easy to be a continuous and uniform layer, affecting the bonding effect.Further, Nike Heels, since most of the aqueous polyurethane adhesive as the main solid component is a polyurethane containing hydrophilic, and even further contains a water-soluble polymeric thickener, so unless a certain degree of cross-linking is formed in the film after drying, the water resistance does not Jia.However, if, by the selection of raw materials, formulation and preparation and bonding process, such as the use of aqueous surface treatment agent for hydrophobic shoe processing, it has a certain polarity and hydrophilicity, will cause the glue well infiltration, the formation of a continuous film, with suitable drying and curing techniques, will be able to get the desired adhesive strength, and to obtain the same excellent effect with the solvent-based polyurethane adhesive.
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