Thinly-coated high-viscosity pressure-sensitive adhesive, and pressure-sensitive adhesive tape

Abstract

The invention discloses a thinly-coated high-viscosity pressure-sensitive adhesive. The thinly-coated high-viscosity pressure-sensitive adhesive comprises the following components by weight: 100 partsof acrylate resin slurry, 0.1-3 parts of a curing agent and 15-50 parts of tackifying resin, wherein the acrylate resin slurry has a weight-average molecular weight of (30-200)*10<4> g/mol and a molecular weight distribution index PDI of 2.0 to 8.0; and the tackifying resin has a softening point of 10 DEG C to 140 DEG C and relative molecular mass of 300 g/mol to 2000 g/mol. On the basis of 100 parts of acrylate resin slurry, the tackifying resin comprises 10-25 parts of rosin resin and 5-25 parts of terpene resin. The pressure-sensitive adhesive has excellent initial adhesion and excellent stripping force, and good fluidity; and a prepared pressure-sensitive adhesive tape is thin in thickness and high in nanocrystalline bonding strength.

Description

technical field [0001] The invention relates to the technical field of pressure-sensitive adhesives, in particular to a thin-coated high-viscosity pressure-sensitive adhesive and a pressure-sensitive adhesive tape. Background technique [0002] In recent years, with the development of portable and thinner electronic products such as mobile phones and tablets, the thickness requirements of double-sided tapes that bond and fix internal components of electronic products tend to be thinner and thinner. The surface tape is thinned from the initial total thickness of 20um to 10um or even 5um. As a result, higher performance requirements are put forward for the double-sided tape used for bonding and fixing the internal components of the mobile phone: it can still maintain a high bonding strength at a very thin thickness, that is, the double-sided tape has the characteristics of "thin coating and high viscosity". ". Compared with the traditional double-sided pressure-sensitive tap...

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Problems solved by technology

[0004] Chinese patent 106459685A "High thermal conductivity ultra-thin tape based on synthetic graphite modification" effectively improves the thermal conductivity of the ultra-thin tape by adding synthetic graphite and high thermal conductivity powder to the pressure-sensitive adhesive, but the thickness of the ultra-thin tape made It can still only be controlled below 20um, and it does not show the advantages of its bonding performance (peeling force, initial adhesion) and the applicability to ferrite or nanocrystalline

Ultra-thin adhesive tape products of 5um and below 5um still have insufficient bonding performance, especially insufficient initial bonding, resulting in poor actual bonding effect on nanocrystals, which affects the good assembly of wireless charging modules for mobile phones and other electronic products. Rate

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