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​Material and fabric structure of waterproof breathable membrane


Kunshan Xinzhenpin Film New Material Technology Co., Ltd.  is an overall solution company focusing on EPTFE membrane and focusing on design, research and development, production, processing, technical support, testing equipment research and development, sales and design.

Xinzhenpi has a strong R&D and design team that can provide customers with high-quality protective film products and continuously improved equipment R&D solutions. Customize modular protective products for customers. Xinzhenpi's products are mainly used in electronics, medical, automotive, packaging, small household appliances, acoustics and other fields. Products include waterproof breathable membranes, waterproof sound-permeable membranes, breathable patches, breathable plugs, breathable caps, breathable gaskets, etc. Xinzhenpi can provide relevant testing equipment and a complete set of independent research and development solutions and related equipment according to customer product needs. We hope to continue to provide customers with high-quality products through high-quality services, continuously innovative solutions, and professional technology.

The development of waterproof and breathable membranes is also a gradual process. From the initial waterproof glue that appeared to meet the waterproof requirements of shoes, clothing, and tents, to the PU film with stable but imperfect waterproof properties, to the TPU film improved and developed based on the PU film, to today's waterproof and breathable film.

Material and fabric structure of waterproof breathable membrane:

The waterproof breathable membrane has the functions of waterproofing, breathability, and thermal insulation. The realization of these functions is determined by the structural material and fabric of the waterproof breathable membrane.

Construction principle: The waterproof and breathable membrane is composed of polymer material + polyolefin microporous membrane + polymer material through hot pressing. The process is domestically pioneered and internationally advanced. The polyolefin microporous membrane has excellent breathability, and the product is durable and has a long service life. The polyolefin microporous membrane is not only resistant to corrosion and acid and alkali, but also has excellent elongation properties. It can rebound quickly after being pierced by a nail to increase the sealing performance. Its waterproof and breathable performance can allow water vapor in the room or insulation layer to pass out, and when the water vapor condenses into water droplets when it encounters cold, the water droplets will also be blocked outside the breathable film. This ensures the performance of the interior and the building, as well as thermal insulation. It is a new high-tech energy-saving and environmentally friendly material.

Its working principle is that the breathable working principle can be divided into two types: micropores and hydrophilic groups. Since the minimum diameter of water droplets is about 20 microns, while the diameter of water vapor molecules is only about 0.0004 microns, there is a huge difference between the diameters of the two. Water vapor can pass through the microporous membrane through the principle of diffusion. The surface tension of liquid water or water droplets prevents water molecules from passing through, thus preventing water penetration and making the breathable membrane waterproof.

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