Elastic pressure-sensitive adhesive layer, pressure-sensitive adhesive tape, and preparation method of pressure-sensitive adhesive tape

Abstract

The invention provides an elastic pressure-sensitive adhesive layer, a pressure-sensitive adhesive tape, and a preparation method of the pressure-sensitive adhesive tape. The elastic pressure-sensitive adhesive layer and the elastic pressure-sensitive adhesive tape utilize a technology that a main body material structure reacts with water to generate a gas causing volume expansion, so that the elastic pressure-sensitive adhesive layer and the elastic pressure-sensitive adhesive tape have elasticity; the limitation of a traditional foam tape is broken through, the elastic pressure-sensitive adhesive layer and the elastic pressure-sensitive adhesive tape can have good buffering performance and compressibility without using foam as a base material, and are superior to a foam adhesive tape inthe aspect of die cutting stability; and the thickness, the viscosity and the compressibility of the elastic pressure-sensitive adhesive layer and the elastic pressure-sensitive adhesive tape can be customized according to actual application requirements, so the elastic pressure-sensitive adhesive layer and the elastic pressure-sensitive adhesive tape have very flexible practicability.

Description

technical field [0001] The invention relates to the technical field of pressure-sensitive adhesive tapes, in particular to an elastic pressure-sensitive adhesive layer, an elastic pressure-sensitive adhesive tape and a preparation method of the elastic pressure-sensitive adhesive tape. Background technique [0002] As all kinds of smart electronic products have more and more stringent requirements on anti-drop, anti-deformation, waterproof and dustproof, hardware manufacturers urgently need high-performance cushioning and energy-absorbing materials to realize the above functions. The mainstream design solution currently on the market is to use various types of foam tapes to achieve these functions. [0003] Foam tape is a kind of tape product made of foam as the base material. This tape is thicker than ordinary tape, has better sealing and shock absorption effect, and can be used in many occasions. Common foams are polyolefin or polyurethane foaming materials. Polyolefin or...

AI Technical Summary

Problems solved by technology

[0004] Due to the characteristics of the foam tape itself, this kind of foam tape often has some inherent deficiencies in its manufacture and application: (1) Since the foam material is made of polyolefin or polyurethane materials, the heat resistance is not good. Well, when there is not enough external tension support, different degrees of shrinkage, arching and other deformations will occur at 80°C, which makes the foam strips unable to undergo high-temperature processing, which means that glue cannot be used directly on the surface of the foam. Coating process to make foam tape: solvent-based glue needs high temperature to remove solvent and cure, UV-type glue will also generate high temperature during UV curing, both of which will cause foam deformation, so only by applying pressure-sensitive adhesive layer The foam tape is produced by transfer coating on the surface of the foam; the surface energy of the foam is mostly below 32 dynes, which leads to the need to pass corona, pre-coating adhesion promoter and other methods when making the foam tape. To improve the surface energy of the foam, in order to ensure that the pressure-sensitive adhesive layer can be bonded to the surface of the foam, the bonding strength is sufficient, the process is complicated, and the manufacturing cost is high

(2) Before the foam tape is assembled into the interior of the smart electronic product, cushioning devices of various shapes need to be processed through a die-cutting process. During the die-cutting process, since polyolefin or polyurethane itself is relatively brittle, it is prone to dust , and electronic products have high requirements on cleanliness, which makes it necessary to always pay attention to whether the devices with foam tape produce dust during the assembly process, which increases the cost of quality

However, the cushioning performance of this solution is inferior to that of the foam base tape, and the foam structure is still needed for reinforcement.

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