Flexible double-sided adhesive tape and preparation process thereof

Abstract

The invention discloses a flexible double-sided adhesive tape and a preparation process thereof. The flexible double-sided adhesive tape sequentially comprises a first release film, a first adhesive layer, a base layer, a second adhesive layer and a second release film from one side to the other side. The flexible double-sided adhesive tape is characterized in that the base layer is a TPU base film layer. When the flexible double-sided adhesive tape provided by the invention is stretched by 100%, the elastic modulus E of the flexible double-sided adhesive tape is less than 2Mpa, the bending resistance of the flexible double-sided adhesive tape is good, and the risk of folding fracture of the flexible double-sided adhesive tape can be reduced; the peel strength of the flexible double-sidedadhesive tape relative to a steel plate or glass is greater than 14N / 25mm and less than 22N / 25mm, the adhesive force of the flexible double-sided adhesive tape is good, the size of the flexible double-sided adhesive tape is proper, and the condition that the flexible double-sided adhesive tape is not easy to peel off due to overlarge peel strength can be avoided; the environment resistance of theflexible double-sided adhesive tape is good; the elongation at break of the flexible double-sided adhesive tape is greater than 1000%; the elastic deformation of the flexible double-sided adhesive tape is large during stripping; no residual adhesive is left; and the reworkability of the flexible double-sided adhesive tape is good.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a flexible double-sided adhesive tape and a preparation process thereof. Background technique [0002] With the development of science and technology and new market demands, flexible and foldable smartphones were launched at the Mobile World Congress in 2019. In order to meet the needs of current consumers for portability and diverse functions, major mobile phone manufacturers are committed to research on foldable smartphones. Therefore, in order to meet the folding requirements, the internal part link tape of the mobile phone needs to match the flexible and repeatable folding. [0003] The folding screen tape in the prior art generally includes a 50 μm release film, a 15-20 μm pressure-sensitive adhesive layer, a 25-50 μm ordinary TPU or foam, a 15-20 μm pressure-sensitive adhesive layer, and a 50 μm pressure-sensitive adhesive layer from top to bottom. Release film, the proc...

AI Technical Summary

Problems solved by technology

[0005] 1. Ordinary TPU base material has high breaking strength and elastic modulus, and relatively poor bending resistance, which cannot meet the needs of AMOLED internal components such as folding screens.

[0006] 2. The foam base material will have creases after bending. Because it is directly pasted under the folding screen, the creases of the foam will be exposed, which will affect the appearance effect

[0007] 3. After the PSA layer is bonded to the steel plate or glass, the peeling force is relatively large, and it is not easy to peel off. It will deform the folding screen and the substrate steel plate, and the reworkability is poor.

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