High-low-viscosity acrylic double-sided tape with adjustable stripping force and antistatic function

Abstract

A high-low-viscosity acrylic double-sided adhesive tape with adjustable stripping force and an antistatic function belongs to the technical field of pressure-sensitive adhesive related adhesives, and comprises a polyester base layer, a low-viscosity adhesive layer with antistatic performance is arranged on the upper side surface of the polyester base layer, and a high-viscosity adhesive layer is arranged on the lower side surface of the polyester base layer; and release film layers are arranged on the outer surfaces of the low adhesive layer and the high adhesive layer. Aiming at the problem that the existing double-sided adhesive tape cannot be applied to the field needing high-precision adhesion and static electricity resistance, the invention provides the high-low-viscosity acrylic double-sided adhesive tape which is designed into a three-layer structure and has adjustable stripping force and static electricity resistance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pressure-sensitive adhesive related adhesives, and particularly relates to a high-low-adhesion acrylic double-sided adhesive tape with adjustable peeling force and antistatic function. BACKGROUND

[0002] With the development of electronic devices towards light and thin, high performance, higher requirements are put forward for the integration and assembly accuracy of internal components. The traditional double-sided adhesive tape mainly uses polyethylene terephthalate (PET) film, non-woven fabric or polyurethane (PU) as the substrate, combined with an acrylate pressure-sensitive adhesive layer, which has certain bonding strength and versatility, but there are certain problems in ultra-thin, elastic recovery, heat conduction efficiency and process compatibility.

[0003] In the prior art, in the disclosure number CN120310458A, an ultra-thin double-sided adhesive tape and its preparation method are disclosed, which are from top to bottom: release film, glue layer, substrate layer, glue layer and release film; the thickness of the glue layer is 1-3 microns, and the thickness of the substrate layer is 1-2 microns; the preparation raw materials of the glue layer include adhesive, curing agent and glue layer solvent; the preparation raw materials of the substrate layer include: soft monomer, hard monomer, chain extender, catalyst, crosslinking agent, end-capping agent and substrate layer solvent.

[0004] However, the technical solution in the prior art is aimed at precision electronic products, such as graphite sheets, nanocrystalline heat dissipation sheets, etc. The core requirement for double-sided adhesive tape in this field is that the thickness needs to be ultra-thin, the total thickness is ≤5 microns, and the thickness of the substrate layer is 1-2 microns; then it needs to achieve high elasticity, and the specific value is 600-700 MPa of elastic modulus.

[0005] However, in the field of consumer electronics and new energy, with increasingly high performance requirements and lightweight requirements, the requirements for adhesives and adhesive tapes are becoming higher and higher. For example, the adhesive fixing of the hinge area module of the new folding screen mobile phone, the anti-shake mechanism of the miniature camera module, and the ultra-thin medical sensor bonding. The double-sided adhesive tape needs to have certain adhesive strength, and also needs to reduce the thickness as much as possible, and also needs to have good antistatic performance. The double-sided adhesive tape in the prior art cannot meet the needs. SUMMARY

[0006] The purpose of the present application is to solve the problem that the existing double-sided adhesive cannot be applied in the field of high-precision bonding and antistatic, and to provide a three-layer structure design of high-low-adhesion acrylic double-sided adhesive tape with adjustable peeling force and antistatic performance.

[0007] In order to achieve the above technical purposes, the present application provides the following technical scheme: a high-low adhesion acrylic double-sided tape with adjustable peeling force and anti-static function, comprising a polyester base layer, the upper side of the polyester base layer is provided with a low-adhesion adhesive layer with anti-static performance, and the lower side of the polyester base layer is provided with a high-adhesion adhesive layer; a release film layer is arranged on the outer surface of the low-adhesion adhesive layer and the high-adhesion adhesive layer.

[0008] In an implementable manner, the thickness of the polyester base layer is 10-15 μm; the thickness of the low-adhesion adhesive layer is 20-25 μm; and the thickness of the high-adhesion adhesive layer is 10-15 μm.

[0009] The polyester base layer, the low-adhesion adhesive layer and the high-adhesion adhesive layer constitute a use layer, and the total thickness of the use layer is 50 μm±3 μm.

[0010] In an implementable manner, the low-adhesion adhesive layer comprises the following components in parts by weight: 100 parts of an acrylate copolymer, 0.01-2 parts of a curing agent, 0.01-2 parts of an anti-static agent, and 100 parts of a solvent.

[0011] In an implementable manner, the high-adhesion adhesive layer comprises the following components in parts by weight: 100 parts of an acrylate copolymer, 0.01-1 parts of a curing agent, and 100 parts of a solvent.

[0012] In an implementable manner, the acrylate copolymer is composed of one or more of a soft monomer and a hard monomer.

[0013] The soft monomer is selected from one or two or more of n-butyl acrylate, isooctyl acrylate, hydroxybutyl acrylate, ethyl acrylate, lauryl acrylate, isobutyl acrylate and hydroxyethyl acrylate.

[0014] The hard monomer is selected from one or two or more of acrylic acid, isobornyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, acryloyl morpholine, ethyl methacrylate and n-butyl methacrylate.

[0015] In an implementable manner, the curing agent is one or two or more of a polyisocyanate curing agent, an epoxy curing agent and a metal salt curing agent.

[0016] In an implementable manner, the anti-static agent is an ionic anti-static agent, which is generally one or two or more of a quaternary ammonium salt, an alkyl sulfonate and a betaine derivative. Preferably, the quaternary ammonium salt is preferably stearyl trimethyl ammonium chloride.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] By adopting a three-layer composite structure of high and low adhesion double-sided tape, differentiated peel force is achieved, solving the peel force defects of double-sided tape structures. The low adhesion side has a peel force of 189gf / 25mm, and the high adhesion side has a peel force of 1596gf / 25mm, which meets the bonding requirements of different materials. For example, the low adhesion side with antistatic properties can be bonded to hinge metal brackets, while the high adhesion side can be bonded to metal frames, achieving perfect bonding of two material components and realizing long-term reliable bonding of metal-polymer composite structures.

[0019] By adding an ionic antistatic agent to the low-tack layer, the obstacle to achieving the antistatic function was also overcome, and the surface resistivity of the low-tack layer reached 10. 9 With an Ω rating, it can effectively eliminate static electricity buildup and is more suitable for precision assembly of electronic components.

[0020] By optimizing the monomer composition and curing system of the acrylic copolymer, the problem of poor mechanical properties was solved, specifically improving the tape's temperature resistance (holding a 1000g load at 105℃ for 24 hours) and durability (holding power at room temperature >12 hours). It exhibits excellent adhesion strength to heating plates (aluminum plates or PI heating films) and good thermal conductivity, demonstrating good reliability in high-temperature environments.

[0021] This application also employs precision coating process control, which can integrate multiple functions such as antistatic properties, high and low viscosity, and high temperature resistance within a total thickness of 50μm±3μm. Attached Figure Description

[0022] 1. Polyester base layer, 2. Low-adhesion layer, 3. High-adhesion layer, 4. Release film layer, 5. Service layer.

[0023] Figure 1 A cross-sectional schematic diagram of this embodiment; Detailed Implementation

[0024] like Figure 1 The illustrated embodiment provides a high- and low-adhesion acrylic double-sided tape with adjustable peel force and antistatic properties. It includes a polyester base layer 1, a low-adhesion layer 2 with antistatic properties on the upper side of the polyester base layer 1, and a high-adhesion layer 3 on the lower side of the polyester base layer 1. A release film layer 4 is disposed on the outer surfaces of the low-adhesion layer 2 and the high-adhesion layer 3. In this embodiment, the polyester base layer 1, the low-adhesion layer 2, and the high-adhesion layer 3 constitute the service layer 5. The thicknesses of each layer in this embodiment are as follows: the polyester base layer 1 is 12 μm thick; the low-adhesion layer 2 is 23 μm thick; the high-adhesion layer 3 is 15 μm thick; and the total thickness of the service layer 5 is 50 μm.

[0025] In the present embodiment, in order to solve the peeling force defect of double-sided adhesive structure, the anti-static function implementation barrier, and the mechanical performance problem, the low-adhesive layer 2 comprises acrylate copolymer, isocyanate curing agent, anti-static agent and other components; specifically, the low-adhesive layer 2 comprises the following components in parts by weight: acrylate copolymer 100 parts, curing agent 0.01-2 parts, anti-static agent 0.01-2 parts, solvent 100 parts.

[0026] The high-adhesive layer 3 comprises acrylate copolymer, epoxy curing agent and other components. Specifically, the high-adhesive layer 3 comprises the following components in parts by weight: acrylate copolymer 100 parts, curing agent 0.01-1 parts, solvent 100 parts.

[0027] In the present embodiment, the acrylate copolymer is composed of one or more kinds of soft monomers and hard monomers; wherein the soft monomers are selected from one or more of n-butyl acrylate, isooctyl acrylate, hydroxybutyl acrylate, ethyl acrylate, lauryl acrylate, isobutyl acrylate, hydroxyethyl acrylate; and the hard monomers are selected from one or more of acrylic acid, isobornyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, acryloyl morpholine, ethyl methacrylate, n-butyl methacrylate.

[0028] The curing agent is one or more of polyisocyanate curing agent, epoxy curing agent, and metal salt curing agent.

[0029] The anti-static agent is an ionic anti-static agent, which is generally one or more of quaternary ammonium salt, alkyl sulfonate, and betaine derivative. The preferred quaternary ammonium salt is stearyl trimethyl ammonium chloride.

[0030] In this embodiment, the method for preparing high-low adhesion acrylic double-sided tape with adjustable peel force and antistatic function is as follows: first, prepare the coating liquid A of the low-adhesion adhesive layer 2, specifically, 100 parts of acrylic copolymer, 2 parts of isocyanate curing agent, 1.5 parts of antistatic agent, and 50 parts of solvent ethyl acetate. Place the above components in a glue preparation container and stir at a speed of 300 rpm for 0.5 H to fully mix and evenly distribute. The coating liquid A of the low-adhesion adhesive layer 2 is obtained. Second, prepare the coating liquid B of the high-adhesion adhesive layer 3, specifically, 100 parts of acrylic ester copolymer, 50 parts of solvent ethyl acetate, and 50 parts of epoxy curing agent. Place the above components in a glue preparation container and stir at a speed of 300 rpm for 0.5 H to fully mix and evenly distribute. The coating liquid B of the high-adhesion adhesive layer 3 is obtained. Third, use a comma-shaped doctor blade to coat the coating liquid A on one side of the polyester base layer 1, with a coating thickness of 23 μm, a coating line speed of 15 m / min, and a heat curing film formation temperature of 120 °C to form the low-adhesion adhesive layer 2. Then, attach a 25 μm thick release film layer 4 to the surface of the low-adhesion adhesive layer 2. Fourth, use a comma-shaped doctor blade to coat the coating liquid B on the other side of the polyester base layer 1, with a coating thickness of 15 μm, a coating speed of 15 m / min, and a heat curing film formation temperature of 120 °C to form the high-adhesion adhesive layer 3. Then, attach a 36 μm thick release film layer 4 to the surface of the high-adhesion adhesive layer 3. Fifth, the formed double-sided tape is aged at 50 °C for 72 H to obtain the finished product.

[0031] The high-low adhesion acrylic double-sided tape with adjustable peel force and antistatic function prepared by the above method needs to be tested in three aspects. First, peel strength test, reference standard GB / T2792-2014, test sample width 24 mm, use 25 μm PET reinforcement, attached to standard mirror steel plate and aluminum plate, normal temperature static 72 H, test 180 ° peel strength, test rate 300 mm / min. Second, high temperature load, test sample width 24 mm, length 100 mm, use 25 μm PET reinforcement, attached to standard mirror steel plate, static 20 min, place the test sample in a 105 °C oven, the tail end of the tape forms a 90 ° angle with the steel plate, the tail end hangs a 1000 g weight, and the tape is placed in an 85 °C environment for 24 H. The displacement amount of the tape is observed and recorded. Third, thermal conductivity, reference standard ASTM D5470, test sample size 25.4*25.4 mm, temperature difference 50-80 °C, test time 20 min.

[0032] After testing, the peel strength of the low-adhesion adhesive layer 2 in this embodiment is: the 180 ° peel strength of the low-adhesion side to the steel plate is 189 gf / 25 mm. The peel parameters of the high-adhesion adhesive layer 3 are: the 180 ° peel strength of the high-adhesion side to the steel plate is 1596 gf / 25 mm.

[0033] The temperature of the low-adhesion layer 2 in this embodiment is kept as follows: the low-adhesion surface is kept at room temperature for more than 12 hours. The temperature of the high-adhesion layer 3 is kept as follows: the high-adhesion surface is kept at room temperature for more than 12 hours.

[0034] Finally, the surface resistance of the low-adhesion layer is 10 9 Ω level, which can effectively eliminate static accumulation and is more suitable for precise assembly of electronic components.

[0035] In the description of this specification, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the technical solutions of the patent and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the patent application.

[0036] In this specification, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, they can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in this specification can be understood according to the specific circumstances.

[0037] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0038] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A high- and low-adhesion acrylic double-sided tape with adjustable peel force and antistatic function, characterized in that, It includes a polyester base layer (1), the upper side of which is provided with a low-adhesion layer (2) with antistatic properties, and the lower side of which is provided with a high-adhesion layer (3); a release film layer (4) is provided on the outer surface of the low-adhesion layer (2) and the high-adhesion layer (3).

2. The high- and low-adhesion acrylic double-sided tape with adjustable peel force and antistatic function according to claim 1, characterized in that, The thickness of the polyester base layer (1) is 10μm-15μm; the thickness of the low-viscosity adhesive layer (2) is 20μm-25μm; and the thickness of the high-viscosity adhesive layer (3) is 10μm-15μm. The polyester base layer (1), the low-adhesion layer (2), and the high-adhesion layer (3) constitute the service layer (5), and the total thickness of the service layer (5) is 50μm±3μm.

3. The high- and low-adhesion acrylic double-sided tape with adjustable peel force and antistatic function according to claim 1, characterized in that, The low-tack adhesive layer (2) comprises the following components in parts by weight: 100 parts of acrylate copolymer, 0.01 to 2 parts of curing agent, 0.01 to 2 parts of antistatic agent, and 100 parts of solvent.

4. The high- and low-adhesion acrylic double-sided tape with adjustable peel force and antistatic function according to claim 1, characterized in that, The high-viscosity adhesive layer (3) comprises the following components in parts by weight: 100 parts of acrylate copolymer, 0.01 to 1 part of curing agent, and 100 parts of solvent.

5. The high- and low-adhesion acrylic double-sided tape with adjustable peel force and antistatic function according to claim 3 or 4, characterized in that, The acrylate copolymer is composed of one or more soft monomers and hard monomers; wherein the soft monomers are selected from one or more of n-butyl acrylate, isooctyl acrylate, hydroxybutyl acrylate, ethyl acrylate, lauryl acrylate, isobutyl acrylate, and hydroxyethyl acrylate. The hard monomer is selected from one or more of acrylic acid, isobornyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, acrylomorpholine, ethyl methacrylate, and n-butyl methacrylate.

6. The high- and low-adhesion acrylic double-sided tape with adjustable peel force and antistatic function according to claim 3 or 4, characterized in that, The curing agent is one or more of the following: polyisocyanate curing agent, epoxy curing agent, and metal salt curing agent.

7. The high- and low-adhesion acrylic double-sided tape with adjustable peel force and antistatic function according to claim 3, characterized in that, The antistatic agent is an ionic antistatic agent, generally one or more of quaternary ammonium salts, alkyl sulfonates, and betaine derivatives.

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