What specific effects does high humidity have on adhesives?
Adhesives are a common bonding material widely used in industrial production. However, humidity significantly affects the performance and quality of adhesives, particularly in terms of curing, adhesive strength, weather resistance, and aging processes.
Shanghai Hinnel
2026/03/05
I. Interference with the curing reaction
In a high-humidity environment, moisture in the air absorbs some of the ultraviolet energy, thereby interfering. UV The photopolymerization process of adhesives can lead to incomplete curing or a slower curing rate. For non- UV Adhesive-like substances, such as Epoxy or polyurethane systems Moisture may trigger side reactions prematurely, affecting the formation of the crosslinked structure.
II. Reduce Adhesive Strength With aging
Moisture easily penetrates the interface between the adhesive layer and the substrate, displacing the chemical bonds or physical adsorption forces that have already formed, thereby causing... “ Hydrolysis ” The phenomenon significantly weakens adhesive bonding. This effect is particularly pronounced on highly polar surfaces such as metals and glass. Moreover, high-humidity environments can accelerate the aging process of adhesives, leading to a decline in their mechanical properties and bonding strength.
III. Promoting Corrosion and Decay
In humid environments, the accumulation of moisture can accelerate the chemical reactions between adhesives and substrates. Particularly on metal substrates, moisture may trigger corrosion, thereby compromising bonding performance. In fields such as automotive and electronics, the risk of corrosion to electronic components is even higher in humid conditions; thus, it is essential to use adhesives with superior waterproofing and moisture resistance properties.
Solution
( 1 Ensure the storage environment is dry.
For moisture-sensitive products such as adhesives, it’s crucial to ensure that the storage environment is dry. Try to avoid storing them in damp places like basements or storage rooms. You can opt for tightly sealed storage methods, such as sealed bags or airtight containers.
( 2 ) Control the humidity of the manufacturing environment.
For companies that manufacture adhesives, controlling the humidity of the manufacturing environment is also extremely important. Humidity in the manufacturing environment can be regulated through methods such as humidification and dehumidification. The relative humidity should be within... 40%~60% Between.
( 3 ) Use products with good humidity stability.
When selecting products such as adhesives, you should prioritize those with good moisture stability. This can effectively reduce the risk of product performance being affected by humidity and ensure consistent quality.
In short, the impact of humidity on adhesives cannot be overlooked. Therefore, during production, storage, and use, special attention must be paid to humidity conditions in order to ensure the quality and performance of the adhesives.
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