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TPU hot melt adhesive film is required to have water resistance
There are many performance requirements for TPU hot melt adhesive film. Water resistance is one of them, and it is also one of the more mentioned properties. Especially for the clothing industry, the washability of TPU hot melt adhesive film is very important. It is related to the wearability of the clothing using TPU hot melt adhesive film for seamless bonding.
2023-02-08
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TPU hot melt adhesive film is required to have water resistance

    There are many performance requirements for TPU hot melt adhesive film. Water resistance is one of them, and it is also one of the more mentioned properties. Especially for the clothing industry, the washability of TPU hot melt adhesive film is very important. It is related to the wearability of the clothing using TPU hot melt adhesive film for seamless bonding.

    Generally speaking, water washability means that the material (usually fabric) can maintain a high adhesive strength after being bonded by TPU hot melt adhesive film, soaked in water at a certain temperature and repeatedly rubbed.

    The hot melt adhesive film with good water washability is TPU hot melt adhesive film and PO hot melt adhesive film. Because it is often used in the field of clothing, there are usually certain requirements for the softness of the hot melt adhesive film, so TPU hot melt adhesive film is more commonly used. In addition, EVA hot-melt adhesive film with a wide range of applications also has certain water washability, but its effect is less than that of TPU hot melt adhesive film.

    Water washability is also divided into different grades, such as normal temperature water washing, 60 ℃ water washing, 90 ℃ water washing, etc. The higher the temperature, the higher the requirement for the washability of the hot-melt adhesive film. Take the TPU hot melt adhesive film for example, the resistance to normal temperature water washing is generally no problem for most TPU hot melt adhesive films.

    In terms of the characteristics of TPU hot melt adhesive film itself, the high temperature resistance of TPU hot melt adhesive film is relatively poor, because it is a thermoplastic material, which needs to be heated and melted, and then cooled and hardened to produce adhesion. The initial melting point of conventional TPU hot melt adhesive film is generally between 40 ℃ and 120 ℃, so in theory, the high temperature resistance is about 120 ℃. However, when the actual temperature is less than 120 ℃, the TPU hot melt adhesive film may soften to a certain extent, so the actual temperature resistance is a little lower than this temperature, which is about 100 ℃, which may be the peak of the current conventional TPU hot melt adhesive film film products.


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TPU hot melt adhesive film vs anaerobic adhesive: "Scene flexibility" difference in automotive interior bonding
2025-09-11
​From the perspective of curing conditions, TPU hot melt adhesive film does not need to rely on special environments, while anaerobic adhesives are severely restricted by "auerobicity". The curing principle of anaerobic glue is to undergo polymerization under conditions of lack of oxygen and catalyzed by metal ions (such as iron and copper). If it is in an environment where air circulation or metal substrates are not available, the curing speed will be greatly slowed down or even unable to cure. In automotive interiors, most bonding scenarios are "open" (such as bonding the door panel skin to PP substrate, and the ceiling fabric to the sponge), the air can freely contact the bonding surface, and the substrate is mostly non-metallic (PP, ABS, fabric, etc.), lacking metal ion catalysis, and additional catalyst is required when using anaerobic glue, and the curing time is as long as several hours, which is difficult to meet the needs of industrial production. The TPU hot melt adhesive film only needs to be melted by heating (120-160℃) and can be cured after pressurization and cooling. It does not need to rely on the ambient oxygen concentration or the base material. It can be cured stably in open or closed bonding scenarios, and the curing time only takes a few dozen seconds to a few minutes, adapting to the fast-paced needs of the interior production line.
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