Learn more about waterborne polyurethane resins and their applications in the textile field

Learn more about waterborne polyurethane resins and their applications in the textile field

2024-07-11 17:06:01
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Due to the hydrophobic properties of waterborne polyurethane resin, it is difficult to dissolve in water or disperse uniformly, and the high reactivity of isocyanate groups to water, the direct synthesis of waterborne polyurethane faces many challenges. Therefore, to achieve the preparation of waterborne polyurethane, the primary strategy is to cleverly integrate hydrophilic functional groups (such as carboxyl, sulfonic acid, etc.) into the polymer chain structure of waterborne polyurethane, and then use the force of these hydrophilic groups to promote the successful dispersion of polyurethane in the water phase, so as to prepare water-dispersed polyurethane.

In order to further optimize the comprehensive properties of waterborne polyurethane coatings, the researchers explored the technical path of introducing sealers. Specifically, the sealer is able to selectively react with part of the isocyanate group (i.e. -NCO) in the prepolymer to form a stable aminoester bond. In this process, the ammonia ester bond is like a "sleeping" isocyanate reservoir, which can "wake up" and split under appropriate heating conditions, re-release the isocyanate group, and then efficiently combine with the hydroxyl group on the fabric surface to form a strong polyurethane crosslinking network. This significantly enhances the adhesion strength and bonding firmness of the waterborne polyurethane coating and the fabric substrate.

Sinograce Chemical is specialized in the production of water based polyurethane resin used on the surface of textile supplies, welcome to consult.

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