Pressure sensitive adhesive coated on release film by laboratory coater

abstract

In this experiment, the process of using laboratory coater Spreader silicone Pressure sensitive adhesive on release film was investigated. The effect of coater parameters, including Spreader speed, Spreader thickness and drying temperature, on the silicone Pressure sensitive adhesive coating performance was evaluated. The experimental results show that Spreader speed, thickness and drying temperature have significant effects on the adhesion and uniformity of silicone Pressure sensitive adhesives.

Introduction

Silicone Pressure sensitive adhesives are widely used in electronics, medical and Encasement fields. Release films are widely used as Spreader substrates due to their excellent release performance. In order to ensure the performance of silicone Pressure sensitive adhesive coatings, Spreader process parameters need to be optimized. This experiment aims to optimize Spreader parameters through laboratory coaters and increase coating mass.

experimental part

Materials and equipment

Spreader Material: Silicone Pressure sensitive adhesive, Release film

Equipment: laboratory coater (model XXX), oven (model YYY), Spreader thickness measurement instrument, adhesion tester

experimental steps

Preparation: Clean the coater and release film to ensure that there are no impurities.

Spreader process parameter settings:

Spreader speed: 5 m/min, 10 m/min, 15 m/min

Spreader thickness: 10μm, 20μm, 30μm

Drying temperature: 80 ° C, 100 ° C, 120 ° C

Spreader process:

Adjust the coater speed and Spreader head clearance to start Spreader.

Spreader is completed, the release film in the oven for drying.

Performance testing:

Coating thickness measurement instrument was used.

Adhesion tester measurement coating initial adhesion and adhesive strength.

Results and Discussion

• Effect of Spreader Speed on coating performance

When the Spreader speed is slow (5 m/min), the coating is more uniform, but the production efficiency is low. If the speed is too fast (15 m/min), it is easy to cause the problem of uneven coating. The optimal Spreader speed is 10 m/min, taking into account coating uniformity and production efficiency.

• Effect of Spreader Thickness on coating performance

Spreader thickness has a significant effect on the adhesion of silicone Pressure sensitive adhesives. When the coating is too thin (10 μm), the adhesion is insufficient; when it is too thick (30 μm), the adhesive layer flows easily, resulting in a decrease in adhesion. Coating thickness of 20 μm exhibits the best initial adhesion and adhesive strength.

• Effect of drying temperature on coating performance

Drying temperature has a significant effect on the curing effect of silicone Pressure sensitive adhesives. At 80 ° C, the curing is insufficient and affects the adhesion. At 120 ° C, the adhesive layer may be over-cured, resulting in a decrease in adhesion. The optimum drying temperature is 100 ° C, which ensures good adhesion and coating Stability.

conclusion

The performance of silicone Pressure sensitive adhesive coatings can be significantly improved by optimizing Spreader speed, Spreader thickness and drying temperature. The optimal process parameters are: Spreader speed 10 m/min, Spreader thickness 20 μm, drying temperature 100 ° C. This study provides a reference for the optimization of Spreader process for silicone Pressure sensitive adhesives in industrial production.