The service life of adhesives is affected by a variety of factors, mainly including the following aspects:
Factors related to the adhesive itself
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Chemical composition: Adhesives with different chemical compositions have significant differences in performance. For example, epoxy resin adhesives have good chemical stability and high bonding strength, and thus have a relatively long service life. However, some natural rubber - based adhesives have slightly poorer chemical stability and may be prone to aging in certain environments, limiting their service life.
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Formulation design: Additives such as plasticizers, fillers, and curing agents added to the adhesive can affect its performance. An appropriate amount of plasticizer can improve the flexibility of the adhesive, but an excessive amount may lead to a decrease in the heat resistance and durability of the adhesive, shortening its service life.
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Production process: Process parameters such as temperature, stirring speed, and reaction time during the production process are crucial to the quality and performance of the adhesive. If the reaction temperature is not properly controlled, it may result in an irregular molecular chain structure of the adhesive, reducing its comprehensive performance and affecting its service life.
Factors related to the adherend
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Material properties: Different materials have different surface chemical properties, roughness, hardness, etc. For example, the surface of metal is smooth, and the bonding force with the adhesive may be inferior to that of rough - surfaced wood or plastic. Moreover, metal may also react chemically with the adhesive, affecting the bonding effect and service life.
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Surface treatment: The cleanliness and flatness of the adherend surface have a direct impact on the adhesion and bonding strength of the adhesive. If there are impurities such as oil stains, dust, and rust on the surface, it will prevent the close combination of the adhesive and the adherend, resulting in poor bonding and shortening the service life.
