Waterproofing principle of waterborne polyurethane fabric coating agent
- 2022-07-09 11:41:28
- admin
Waterborne polyurethane fabric coating agent can give the fabric a good soft and plump feel and skin feeling, and the anti-wrinkle, anti-shrinkage, resilience and flexure of the coated fabric have been greatly improved, waterproof waterproof polyurethane fabric coating agent has become the fabric manufacturers and consumers favored object.So how does waterborne polyurethane work as a waterproofing agent in fabrics.
Waterborne polyurethane can bond tightly to the surface of the fabric and form a continuous and dense film, which is the key to realize its waterproof performance.
The tighter the waterborne polyurethane membrane, the less water molecules are easy to penetrate, and the tighter the waterborne polyurethane and fabric bonding, the more water resistant and not easy to fall off.The adhesion between waterborne polyurethane and fabric is mainly related to the polar groups contained in the structure, such as ammonia ester bond, urea bond, ion bond, etc. There are coulomb force, van der Waals attraction and hydrogen bond between them and fabric surface.The ideal bonding state is that the adhesion between waterborne polyurethane and fabric is greater than the cohesion of fabric, but less than the cohesion between waterborne polyurethane.The density of film formation is related to the cohesive energy of waterborne polyurethane molecules. The greater the cohesive energy is, the smaller the distance between molecules is, the more compact the structure is, and the more dense the film formation is At the same time, in order to maximize the degree of waterproof, the surface tension of waterborne polyurethane film is reduced as much as possible, so that the contact Angle between water droplets and waterborne polyurethane film increases, water droplets are not easy to spread out on the surface of waterborne polyurethane, thus reducing the infiltration effect of water droplets on waterborne polyurethane coating agent.
Sinograce Chemical, specializing in the production of waterborne polyurethane series products for many years, non-toxic environmental protection we have a professional team, with a professional attitude, to solve the problems in practical application for you if you are interestedin our waterborne polyurethane products or have doubts,Sinograce Chemicalchemical welcome you to consult, this is our email sales@sinogracechem.com
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