Transparent UV glue is essential in various industries, from electronic manufacturing to medical applications, due to its fast curing and long-lasting bonding properties. However, over time, the application of UV glue may experience discoloration, where the cured glue turns yellow. This phenomenon will seriously affect the functional performance and aesthetics of the product. So, why does UV glue turn yellow? How to effectively solve this problem? Now let’s explore the key factors that cause UV glue to turn yellow with Yi Lian, and find ways to alleviate and prevent it!
Why UV glue turns yellow and how to prevent it
The yellowing phenomenon of UV glue refers to the gradual discoloration of the originally transparent UV glue due to various factors during use. Here are some of the main reasons for UV glue yellowing:
Degradation of UV stabilizers: In order to protect UV adhesives from the effects of ultraviolet (UV) radiation, many manufacturers add UV stabilizers to adhesive formulations. However, prolonged exposure to ultraviolet radiation can lead to the degradation of these stabilizers, reducing their protective effectiveness. Eventually, the adhesive will start to turn yellow and lose its original transparency.
Oxidation reaction: Components in UV adhesives, such as resins and additives, are prone to oxidation when exposed to light and oxygen in the air. Oxidation produces peroxide structures and free radicals, leading to discoloration of transparent materials. Oxygen is particularly destructive to materials containing unsaturated double bonds or easily oxidizable functional groups. At high temperatures, oxidation reactions accelerate, and even stable single bonds like C-C can break, leading to yellowing. Long term exposure to strong light or high temperature will further intensify oxidation, making yellowing more severe.
Exposure to light and high temperatures: When UV adhesives are directly exposed to sunlight or strong artificial light for a long time, the ultraviolet rays in the light can cause oxidation reactions, leading to discoloration.
Curing process:
Excessive curing: During the curing process, excessive light intensity or exposure can increase the risk of yellowing.
Insufficient curing: On the other hand, insufficient light intensity or curing time can cause the photoinitiator in the adhesive to not react. Over time, these unreacted components will interact with environmental factors, causing the adhesive to turn yellow.
Solution to prevent and solve yellowing of UV adhesives
In response to the problem of UV glue yellowing, Yilian Electronic Adhesive has taken the following measures to effectively prevent this phenomenon from occurring:
Choosing high-quality UV glue: Using UV glue from reputable and reliable suppliers can help minimize the risk of yellowing. Poor quality glue may contain unstable components that are prone to oxidation and discoloration over time.
Control curing conditions: The UV glue curing process must strictly control the light intensity, exposure time, and wavelength. These parameters should match the UV glue used. Improper light intensity, inappropriate wavelength, long or short exposure time can all cause the glue to turn yellow.
Avoid direct sunlight: Store the adhesive in a cool place, away from direct sunlight to reduce UV exposure. This can slow down the yellowing of the adhesive and extend the product’s lifespan.
Check the UV resistance of the adhesive: When selecting UV adhesive, users should check the information with the manufacturer to ensure that the product has sufficient UV resistance.
The key to controlling UV glue yellowing is to control the aging process of the adhesive. However, this process is extremely complex and influenced by multiple factors, making it difficult to achieve ideal prevention in any situation.
Yilian Solution: Anti yellowing UV Adhesive
BEMA UV 1016 UV cured acrylic adhesive UV 1016 is a single component UV/visible light cured modified acrylic adhesive
Acid ester structural adhesive, with low odor, good workability, fast curing, and adhesive properties
High strength, high toughness, strong impact resistance, yellowing resistance, water resistance, and
Excellent heat and cold resistance, with a purple transparent adhesive layer and a volume shrinkage rate after curing
Small size, good waterproof performance, and other characteristics; Its viscosity is moderate and can be manually adjusted
Mechanical adhesive coating.
BEMA UV 1028 UV cured acrylic adhesive UV 1028 is a single component UV/visible light cured modified acrylic adhesive
Acid ester structural adhesive, with low odor, good workability, fast curing, and adhesive properties
High strength, high toughness, strong impact resistance, yellowing resistance, water resistance, and
Excellent heat and cold resistance, colorless and transparent adhesive layer after curing, and volume shrinkage rate
Small size, good waterproof performance, and other characteristics; Its viscosity is moderate and can be manually adjusted
Mechanical adhesive coating. The product contains fluorescent indicator trackers.
Tags: UV glue · UV curing glue
