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TPU hot melt adhesive film is sensitive to ultraviolet radiation
​1、 Introduction ​TPU hot melt adhesive film is a high-performance adhesive material widely used in various fields. However, this type of adhesive film is sensitive to ultraviolet radiation and is easily affected by it. This article will explore the sensitivity of TPU hot melt adhesive film to ultraviolet radiation and its reasons, as well as how to reduce this impact.
2023-12-07
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TPU hot melt adhesive film is sensitive to ultraviolet radiation

    1、 Introduction

    TPU hot melt adhesive film is a high-performance adhesive material widely used in various fields. However, this type of adhesive film is sensitive to ultraviolet radiation and is easily affected by it. This article will explore the sensitivity of TPU hot melt adhesive film to ultraviolet radiation and its reasons, as well as how to reduce this impact.

    2、 Characteristics of TPU hot melt adhesive film

    TPU hot melt adhesive film is a type of polyurethane hot melt adhesive film, which has excellent adhesion performance, weather resistance, wear resistance, and chemical corrosion resistance. However, it also has certain drawbacks, one of which is its sensitivity to ultraviolet radiation. Under long-term or high-intensity ultraviolet radiation, TPU hot melt adhesive film is prone to yellowing, degradation, and loss of adhesion.

    3、 Reasons for UV sensitivity

    The sensitivity of TPU hot melt adhesive film to ultraviolet radiation is mainly related to its chemical structure. TPU molecular chains contain polyurethane groups, which are prone to photo oxidation reactions under UV irradiation, leading to a decrease in material properties. In addition, ultraviolet radiation can also trigger free radical reactions, further accelerating material degradation.

    4、 Methods to reduce UV sensitivity

    To reduce the sensitivity of TPU hot melt adhesive film to ultraviolet radiation, the following methods can be adopted:

    1. Adding UV resistant agent: Adding an appropriate amount of UV resistant agent to the TPU hot melt adhesive film can effectively absorb UV rays and reduce their impact on the adhesive film. Common anti UV agents include organosilicon, zinc oxide powder, etc.

    2. Surface coating: Apply a layer of UV resistant coating on the surface of TPU hot melt adhesive film, which can effectively block the influence of UV on the adhesive film. Common coating materials include acrylic resin, polyurethane, etc.

    3. Control the usage environment: Try to avoid using TPU hot melt adhesive film in strong sunlight to reduce the impact of ultraviolet rays. Meanwhile, avoid prolonged exposure to sunlight or high-temperature baking during use.

    4. Choose TPU raw materials with good stability: Selecting TPU raw materials with stable structure and not easily affected by ultraviolet radiation can effectively improve the stability of TPU hot melt adhesive film

    5. Optimize formula: By optimizing the formula of TPU hot melt adhesive film, reduce its photosensitivity. For example, adding fillers appropriately or reducing the proportion of polyurethane groups.

    6. Double sided bonding: Using TPU hot melt adhesive film in a double-sided bonding method can reduce the time it takes for ultraviolet rays to directly irradiate the surface of the adhesive film, thereby reducing its impact.

    7. Add a protective layer: Add a protective layer above the TPU hot melt adhesive film, such as PET film, to block the impact of ultraviolet radiation on it.

    8. Reasonable structure design: When designing products, arrange the structure reasonably to reduce the chance of ultraviolet radiation on TPU hot melt adhesive film. For example, using shading structure design or adding shading materials.

    9. Use of alternative materials: In certain application scenarios, alternative materials can be considered to replace TPU hot melt adhesive films to avoid the influence of ultraviolet radiation. For example, bonding of materials can be achieved through methods such as hot pressing composite and electromagnetic induction heating.

    10. Strengthen storage management: During the storage process, avoid direct sunlight and high temperature environments, and try to choose a cool and dry place to store TPU hot melt adhesive film. At the same time, it is necessary to regularly check the storage situation to ensure stable material quality.

    5、 Conclusion

    In summary, the sensitivity of TPU hot melt adhesive film to ultraviolet radiation can be alleviated through various methods. In practical applications, appropriate methods should be selected based on specific usage scenarios and requirements to improve its stability and extend its service life.

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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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