How to control the curing depth and speed of UV cured conductive silver paste?

Brief introduction

UV cured conductive silver pasteIt has a wide range of applications in various fields such as electronic packaging and printed circuit boards. Accurately controlling its curing depth and speed is crucial for ensuring product quality and improving production efficiency. This article will explore in depth the methods of controlling the curing depth and speed of UV cured conductive silver paste, and explain them with data. At the same time, it will introduce the relevant characteristics of the YB8632 UV cured conductive silver paste from Advanced Institute (Shenzhen) Technology Co., Ltd.

2、 The curing principle of UV cured conductive silver paste

UV cured conductive silver paste is mainly composed of silver powder, resin matrix, photoinitiator and other components. When exposed to ultraviolet (UV) radiation, the photoinitiator absorbs specific wavelengths of UV light energy, producing active substances such as free radicals or cations. These active substances trigger polymerization reactions in the resin matrix, thereby transforming the silver paste from liquid to solid and achieving solidification. During this process, the curing depth and speed are influenced by various factors.

3、 Methods for controlling curing depth

（1） UV light energy

1. The relationship between light intensity and curing depth
   • The intensity of UV light has a direct impact on the curing depth. Generally speaking, the stronger the light intensity, the greater the curing depth. For example, when using a UV light source with a power of 50mW/cm ², the curing depth may only be 0.5mm; When the light intensity is increased to 150mW/cm ², the curing depth can reach 1.5-2mm. This is because higher light intensity can activate more photoinitiators, thereby triggering deeper resin polymerization reactions.
   • regardingYB8632 UV cured conductive silver paste from Yanbo brandAt the appropriate wavelength, when the light intensity is increased from 50mW/cm ² to 150mW/cm ², the curing depth is increased by about 3-4 times.
2. Light penetrability
   • Different materials have varying levels of UV light penetration. If the silver paste contains a high amount of light blocking components (such as high content of silver powder), it will reduce the penetration depth of UV light, thereby affecting the curing depth. For example, when the silver powder content increases from 50% to 70%, the curing depth may decrease from 1.2mm to around 0.8mm due to the obstruction of UV light by silver powder.

（2） Silver paste composition

1. Photoinitiator concentration
   • The concentration of photoinitiator is an important factor affecting the curing depth. Appropriately increasing the concentration of photoinitiator can increase the curing depth. Research has shown that when the concentration of photoinitiator is increased from 1% to 3%, the curing depth can be increased by about 0.3-0.5mm. However, excessive concentration of photoinitiator may lead to a decrease in the performance of the cured silver paste, such as reduced conductivity.
   • Research Platinum Brand YB8632UV cured conductive silver pasteBy optimizing the concentration of the photoinitiator, good control of the curing depth was achieved while ensuring the conductivity of the silver paste.
2. Characteristics of resin matrix
   • The transparency, viscosity, and other characteristics of the resin matrix can affect the penetration and reactivity of UV light. A highly transparent resin matrix facilitates UV light penetration, thereby increasing the curing depth. For example, using acrylic resin matrix with higher transparency can increase the curing depth by about 0.2-0.3mm compared to ordinary resin matrix under the same conditions.

4、 Methods for controlling curing speed

（1） UV light energy

1. The relationship between light intensity and curing speed
   • There is a positive correlation between light intensity and curing speed. Higher light intensity can accelerate the activation of photoinitiators and the polymerization reaction of resins, thereby improving the curing speed. Experimental data shows that when the light intensity is 50mW/cm ², the curing time may take 60 seconds; When the light intensity is increased to 150mW/cm ², the curing time can be shortened to 10-15 seconds.
   • Under high-power UV light irradiation, the curing speed of YB8632 UV cured conductive silver paste from Yanbo brand is significantly improved. For example, under a light intensity of 150mW/cm ², its curing speed is 5-6 times faster than under a light intensity of 50mW/cm ².
2. ON-TIME
   • Extending the exposure time of UV light can increase the degree of curing, but prolonged exposure time may lead to excessive curing and affect the performance of the silver paste. Generally speaking, in the initial stage, the curing speed increases with the increase of irradiation time, and gradually slows down after reaching a certain time. For example, under a light intensity of 100mW/cm ², the curing speed is faster in the first 30 seconds, and then the curing speed gradually decreases.

（2） Silver paste composition

1. Type of photoinitiator
   • Different types of photoinitiators have different reaction activities. Choosing a highly reactive photoinitiator can improve the curing speed. For example, using a new type of acylphosphine oxide photoinitiator can increase the curing speed by about 30% -50% compared to traditional benzoin ether photoinitiators under the same UV intensity.
   • YB8632 UV cured conductive silver paste from Yanbo brandThe use of efficient photoinitiators has effectively improved the curing speed.
2. The impact of additives
   • Some additives can affect the activity of photoinitiators or the polymerization reaction rate of resins. For example, adding a small amount of active diluent (such as 1% -3%) can reduce the viscosity of the resin, making it easier for the photoinitiator to diffuse in the system, thereby increasing the curing speed.

5、 Conclusion

Controlling the curing depth and speed of UV cured conductive silver paste requires comprehensive consideration of multiple factors, including UV light energy, silver paste composition, etc. By precisely adjusting these factors, effective control of curing depth and speed can be achieved to meet the needs of different application scenarios. The research platinum brand YB8632 UV cured conductive silver paste from Advanced Institute (Shenzhen) Technology Co., Ltd. embodies advanced technological concepts in composition optimization and performance control, providing a reliable product selection for applications in related fields.
The above data is for reference only, and specific performance may vary due to production processes and product specifications.