High-temperature-resistant shading type cotton paper double-sided adhesive tape as well as preparation method and application thereof

Abstract

The invention relates to a high-temperature-resistant shading type cotton paper double-sided adhesive tape and a preparation method and application thereof. The high-temperature-resistant shading type cotton paper double-sided adhesive tape comprises a first layered high-temperature-resistant shading adhesive layer, a base material layer and a second layered high-temperature-resistant shading adhesive layer which are sequentially stacked, the first high-temperature-resistant middle layer is arranged on the first layered high-temperature-resistant shading adhesive layer; the second high-temperature-resistant middle layer is arranged on the second layered high-temperature-resistant shading adhesive layer; the base material layer is tissue paper containing polyether-ether-ketone powder; the first high-temperature-resistant middle layer and the second high-temperature-resistant middle layer respectively comprise glass fiber cloth; the first layered high-temperature-resistant shading adhesive layer comprises a first shading adhesive layer and a first high-temperature-resistant adhesive layer; the second layered high-temperature-resistant shading adhesive layer comprises a second shading adhesive layer and a second high-temperature-resistant adhesive layer; the first high-temperature-resistant adhesive layer and the second high-temperature-resistant adhesive layer contain silicon dioxide, and the first shading adhesive layer and the second shading adhesive layer contain shading materials. The high-temperature-resistant shading type cotton paper double-sided adhesive tape can be used for a long time in a high-temperature environment of 150 DEG C or above, and has good shading performance and bonding performance at the same time.

Description

Technical Field

[0001] This invention relates to the field of adhesive tapes, specifically to a high-temperature resistant, light-shielding double-sided cotton paper tape, its preparation method, and its application. Background Technology

[0002] In modern industrial production and daily life, double-sided tape is widely used as a common adhesive material, especially in electronic equipment manufacturing (such as automotive electronic systems, installation of electronic components inside high-temperature industrial equipment), optical instrument manufacturing, and display production. It has stringent requirements for performance: on the one hand, it must withstand the high temperatures generated by equipment operation or working conditions to ensure bonding stability; on the other hand, it must shield light to avoid leakage interference and ensure the performance of optical products.

[0003] Although various types of double-sided tapes are available on the market (such as the cotton paper double-sided tape disclosed in patent CN105349072B), most of them only focus on basic bonding functions. Existing double-sided tapes generally have the following drawbacks:

[0004] (1) Insufficient temperature resistance: The adhesive layer of the existing ordinary cotton paper double-sided tape softens and flows at 80~120℃, and the adhesion drops significantly. In addition, the cotton paper substrate itself has poor temperature resistance (it is easy to carbonize above 120℃), which makes the components easy to fall off in high temperature environments and cannot be adapted to industrial / electronic working conditions above 150℃ (such as electronic components in the engine compartment of automobiles).

[0005] (2) Conflict between light blocking and adhesion: Although some tapes add light blocking agents, they adopt a single adhesive layer design. If the amount of light blocking agent (such as carbon black) added is insufficient, the light blocking effect will be poor (light transmittance > 5%). If the amount added is too high, it will destroy the adhesive layer adhesion, resulting in the peel force dropping to below 8N / 24mm, and it will be impossible to balance light blocking and adhesion.

[0006] (3) Single function: Most existing technologies only optimize temperature resistance and light shielding, without forming a synergistic design of "temperature resistance-light shielding-adhesion". It is difficult to meet the combined needs of high-temperature electronic and optical scenarios at the same time, which limits its application in special fields. Existing technologies do not target the synergistic temperature resistance design of "substrate-adhesive layer", but only optimize the performance by adjusting the parameters of a single adhesive layer. This cannot meet the combined needs of high-temperature bonding and light shielding at the same time, thus limiting the applicable scenarios. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the primary objective of this invention is to provide a high-temperature resistant, light-shielding double-sided cotton paper tape. This high-temperature resistant, light-shielding double-sided cotton paper tape exhibits significantly improved temperature resistance, allowing for prolonged use in high-temperature environments above 150°C. The adhesive layer does not melt or flow, and the substrate does not carbonize. Simultaneously, it possesses excellent light-shielding and adhesive properties.

[0008] The second objective of this invention is to provide a method for preparing the high-temperature resistant, light-shielding double-sided cotton paper tape.

[0009] A third objective of this invention is to provide the application of this high-temperature resistant, light-shielding double-sided cotton paper tape.

[0010] To achieve the first objective of this invention, a high-temperature resistant, light-shielding cotton paper double-sided adhesive tape is provided, comprising a first layer of high-temperature resistant, light-shielding adhesive, a substrate layer, a second layer of high-temperature resistant, light-shielding adhesive, and a release layer, stacked sequentially, and a first high-temperature resistant intermediate layer disposed on the first layer of high-temperature resistant, light-shielding adhesive and a second high-temperature resistant intermediate layer disposed on the second layer of high-temperature resistant, light-shielding adhesive; the substrate layer is cotton paper containing polyetheretherketone powder; the first and second high-temperature resistant intermediate layers each comprise fiberglass cloth; the first layer of high-temperature resistant, light-shielding adhesive includes a first light-shielding adhesive layer and a first high-temperature resistant adhesive layer, the first light-shielding adhesive layer being closer to the substrate layer than the first high-temperature resistant adhesive layer; the second layer of high-temperature resistant, light-shielding adhesive includes a second light-shielding adhesive layer and a second high-temperature resistant adhesive layer, the second light-shielding adhesive layer being closer to the substrate layer than the second high-temperature resistant adhesive layer; the first and second high-temperature resistant adhesive layers contain silica, and the first and second light-shielding adhesive layers contain light-shielding materials.

[0011] In some embodiments of the present invention, the substrate layer further contains polyamide epichlorohydrin.

[0012] In some embodiments of the present invention, the substrate layer contains, by weight, 100 parts of cotton paper base material, 5-10 parts of polyether ether ketone powder, and 2-5 parts of polyamide epichlorohydrin.

[0013] In some embodiments of the present invention, the substrate layer is a paper made of pulp formed by dispersing a paper base material, polyetheretherketone powder and polyamide epichlorohydrin.

[0014] In some embodiments of the present invention, the thickness of the substrate layer is 40~80μm, the pore size is 10~20μm, and the air permeability is 50~80mm / s.

[0015] In some embodiments of the present invention, the particle size of the polyether ether ketone powder is 5~15 μm.

[0016] In some embodiments of the present invention, the thickness of the glass fiber cloth is 5~15μm, the basis weight is 10~15g / m², and the pore size is 5~10μm.

[0017] In some embodiments of the present invention, the thickness of the first high-temperature resistant adhesive layer or the second high-temperature resistant adhesive layer is 6~10μm.

[0018] In some embodiments of the present invention, the first high-temperature resistant adhesive layer or the second high-temperature resistant adhesive layer contains, by weight, 80-90 parts of a first acrylate monomer polymer, 2-5 parts of silica, and 1-3 parts of a first isocyanate crosslinking agent; the polymeric monomers of the first acrylate monomer polymer include butyl acrylate, methyl methacrylate, and hydroxyethyl acrylate in a mass ratio of (60-70):(20-30):(5-10), and the Tg of the first acrylate monomer polymer is -30℃ to -20℃.

[0019] In some embodiments of the present invention, the particle size of the silicon dioxide is 1~3μm.

[0020] In some embodiments of the present invention, the thickness of the first light-shielding adhesive layer or the second light-shielding adhesive layer is 4~8μm.

[0021] In some embodiments of the present invention, the first or second light-shielding adhesive layer contains, by weight, 75-85 parts of a second acrylate monomer polymer, 2-4 parts of light-shielding material, 3-5 parts of plasticizer, and 1-3 parts of a second isocyanate crosslinking agent; the polymer monomers of the second acrylate monomer polymer include butyl acrylate, methyl methacrylate, and hydroxyethyl acrylate in a mass ratio of (60-70):(20-30):(5-10), and the Tg of the second acrylate monomer polymer is -30℃ to -20℃.

[0022] In some embodiments of the present invention, the light-shielding material is carbon black with a particle size of 20-50 nm.

[0023] In some embodiments of the present invention, the light-shielding material forms a color paste for use in the light-shielding top layer, the color paste having a solid content of 25-35 wt% and also containing a dispersant.

[0024] In some embodiments of the present invention, the plasticizer is dibutyl phthalate.

[0025] In some embodiments of the present invention, the thickness of the release layer is 100~140μm.

[0026] In some embodiments of the present invention, the release layer comprises PET and a polydimethylsiloxane release agent coated on the surface of the PET.

[0027] In some embodiments of the present invention, the release force of the release layer is ≤40g / 24mm.

[0028] To achieve the second objective of this invention, this invention provides a method for preparing a high-temperature resistant, light-shielding double-sided cotton paper tape as described in any of the above embodiments, comprising the following steps:

[0029] Step 1: Apply a high-temperature resistant adhesive to the surface of the release layer and dry it to obtain a second high-temperature resistant adhesive layer. Then, laminate glass fiber cloth onto the surface of the second high-temperature resistant adhesive layer to form a second high-temperature resistant intermediate layer. Apply a light-shielding adhesive to the surface of the second high-temperature resistant intermediate layer and dry it to obtain a second light-shielding adhesive layer. Finally, laminate a substrate layer onto the surface of the second light-shielding adhesive layer to obtain the first semi-finished product.

[0030] Step 2: Coat the surface of the release paper with a high-temperature resistant adhesive and dry it to obtain the first high-temperature resistant adhesive layer. Then, laminate glass fiber cloth onto the surface of the first high-temperature resistant adhesive layer to form the first high-temperature resistant intermediate layer. Finally, coat the surface of the first high-temperature resistant intermediate layer with a light-shielding adhesive and dry it to form the first light-shielding adhesive layer, thus obtaining the second semi-finished product.

[0031] Step 3: Composite the substrate layer of the first semi-finished product with the first light-shielding adhesive layer of the second semi-finished product to obtain a high-temperature resistant light-shielding cotton paper double-sided adhesive tape.

[0032] In some embodiments of the present invention, the high-temperature resistant adhesive is prepared by adding acrylate monomer polymer, silica, isocyanate crosslinking agent and first solvent into a stirring device and stirring at a rate of 300~500 r / min for 20~40 min until the mixture is homogeneous.

[0033] In some embodiments of the present invention, the preparation method of the light-shielding adhesive is as follows: adding acrylate monomer polymer, color paste containing light-shielding material, plasticizer, isocyanate crosslinking agent and second solvent into a stirring device, stirring at a rate of 300~500 r / min for 20~40 min, and mixing evenly.

[0034] In some embodiments of the present invention, the preparation method of the substrate layer is as follows: polyether ether ketone powder and polyamide epichlorohydrin are added to pulp with a base material concentration of 10% for cotton paper, stirred at 200~400r / min for 10~30min, uniformly dispersed, and then made into cotton paper.

[0035] In some embodiments of the present invention, the color paste is prepared by dispersing a light-shielding material in ethyl acetate / propylene glycol methyl ether containing 0.5-1% dispersant, wherein the volume ratio of ethyl acetate to propylene glycol is 7:3.

[0036] In some embodiments of the present invention, in steps one and two, the drying temperature of the high-temperature resistant adhesive is 80~90℃, the drying time is 8~15min, and the glass fiber cloth is laminated after cooling; the drying temperature of the light-shielding adhesive is 75~85℃, the drying time is 5~10min; the second light-shielding adhesive layer in step one is laminated with the substrate layer after cooling.

[0037] In some embodiments of the present invention, in step three, after the substrate layer of the first semi-finished product is laminated with the first light-shielding adhesive layer of the second semi-finished product, the resulting tape is rolled up and left to stand at room temperature for at least 4 days.

[0038] To achieve the third objective of this invention, this invention provides an application of a high-temperature resistant, light-shielding double-sided cotton paper tape as described in any of the above-mentioned solutions. The high-temperature resistant, light-shielding double-sided cotton paper tape is used for the installation of electronic components in automotive engine compartments, the installation of electronic components inside high-temperature industrial equipment, the manufacturing of optical instruments, or the production of displays.

[0039] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0040] The high-temperature resistant light-shielding double-sided adhesive tape of the present invention adopts a structure of a first layer of high-temperature resistant light-shielding adhesive layer - substrate layer - second layer of high-temperature resistant light-shielding adhesive layer - release layer, and provides a first high-temperature resistant intermediate layer and a second high-temperature resistant intermediate layer in the two layers of high-temperature resistant light-shielding adhesive layer respectively. The addition of polyetheretherketone powder in the substrate layer can prevent the cotton paper from carbonizing. The two high-temperature resistant intermediate layers can block the conduction of high temperature and further protect the substrate from carbonization. The two layers of high-temperature resistant light-shielding adhesive layer avoid the conflict between light-shielding and temperature resistance performance through the division of labor and cooperation between the heat-resistant layer and the light-shielding layer. Ultimately, the tape can be used for a long time in high-temperature environments above 150°C without the adhesive layer melting or flowing, and the substrate not carbonizing. At the same time, it has good light-shielding and adhesion performance. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of an embodiment of the high-temperature resistant light-blocking double-sided cotton paper tape of the present invention; Figure 2 This is a schematic diagram of another embodiment of the high-temperature resistant, light-shielding double-sided cotton paper tape of the present invention.

[0042] In the figure, 10-first layer of high temperature resistant light-shielding adhesive layer, 11-first high temperature resistant adhesive layer, 12-first light-shielding adhesive layer, 20-substrate layer, 30-second layer of high temperature resistant light-shielding adhesive layer, 31-first high temperature resistant adhesive layer, 32-first light-shielding adhesive layer, 40-release layer, 50-first high temperature resistant intermediate layer, 60-second high temperature resistant intermediate layer.

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0044] This invention provides a high-temperature resistant, light-shielding double-sided cotton paper tape. This tape can be used for extended periods in environments exceeding 150°C without melting or flowing, and without carbonization of the substrate. It also exhibits excellent light-shielding and adhesive properties, making it suitable for installing electronic components in automotive engine compartments, installing electronic components inside high-temperature industrial equipment, manufacturing optical instruments, or producing displays. It is adaptable to industrial / electronic operating conditions exceeding 150°C. This high-temperature resistant, light-shielding double-sided cotton paper tape can be retained in the product as an adhesive material for bonding and installing different components, or it can be used as an adhesive material for positioning and bonding components, semi-finished products, or finished products during the manufacturing process, without being retained in the product itself. Of course, this high-temperature resistant, light-shielding double-sided cotton paper tape can also be used in other fields and scenarios.

[0045] Specifically, the high-temperature resistant light-shielding double-sided adhesive tape of this embodiment includes a first layer of high-temperature resistant light-shielding adhesive, a substrate layer, and a second layer of high-temperature resistant light-shielding adhesive, which are stacked sequentially. The first layer of high-temperature resistant light-shielding adhesive and the second layer of high-temperature resistant light-shielding adhesive are respectively disposed on both sides of the substrate layer. The high-temperature resistant light-shielding double-sided adhesive tape of this embodiment also includes a first high-temperature resistant intermediate layer disposed on the first layer of high-temperature resistant light-shielding adhesive and a second high-temperature resistant intermediate layer disposed on the second layer of high-temperature resistant light-shielding adhesive.

[0046] The substrate layer is a cotton paper containing polyetheretherketone (PEEK) powder. The cotton paper provides support for the adhesive tape and has good flexibility, allowing it to bond to various shapes and materials. Adding PEEK powder to the cotton paper as a high-temperature resistant additive prevents carbonization.

[0047] The first and second high-temperature resistant intermediate layers each comprise fiberglass cloth. The fiberglass cloth protects the substrate layer, blocks high-temperature conduction to the substrate layer, further prevents carbonization of the substrate layer, and improves the overall tensile strength. The first and second high-temperature resistant intermediate layers can be located between the first layer of high-temperature resistant light-shielding adhesive and the second high-temperature resistant intermediate layer, or they can be located close to the substrate layer. The first and second high-temperature resistant intermediate layers are located on both sides of the substrate layer along the thickness direction of the tape, but not on the outermost side of the corresponding first layer of high-temperature resistant light-shielding adhesive and the second high-temperature resistant intermediate layer. This protects the substrate layer from carbonization without affecting the adhesion performance on both sides of the tape.

[0048] The first layer of high-temperature resistant light-shielding adhesive includes a first light-shielding adhesive layer and a first high-temperature resistant adhesive layer. The first light-shielding adhesive layer is closer to the substrate layer than the first high-temperature resistant adhesive layer. Similarly, the second layer of high-temperature resistant light-shielding adhesive includes a second light-shielding adhesive layer and a second high-temperature resistant adhesive layer. The second light-shielding adhesive layer is closer to the substrate layer than the second high-temperature resistant adhesive layer. With this structure, the high-temperature resistant adhesive layer and the light-shielding adhesive layer are separated, preventing the light-shielding material from being directly added to the high-temperature resistant adhesive layer and affecting its high-temperature resistance, adhesion, and mechanical properties. The high-temperature resistant adhesive layer improves the tape's temperature resistance. Located on the outer side of the tape, it comes into contact with the heat source first, giving the tape better overall high-temperature resistance. It does not soften at 150°C while maintaining adhesion. The light-shielding adhesive layer blocks light, resulting in lower visible light transmittance for the tape.

[0049] The first and second high-temperature resistant adhesive layers contain silica, which improves the high-temperature resistance of the adhesive layers while maintaining good adhesion and high peel strength. The first and second light-shielding adhesive layers contain light-shielding materials, which impart good light-shielding properties to the adhesive layers, reducing visible light transmittance.

[0050] As can be seen from the above, the high-temperature resistant light-shielding double-sided adhesive tape of this embodiment adopts a layered high-temperature resistant light-shielding adhesive layer and a high-temperature resistant intermediate layer, and optimizes the layered design of the adhesive layer. The high-temperature resistant intermediate layer is used to block high temperature conduction and protect the substrate layer from carbonization; the layered high-temperature resistant light-shielding adhesive layer avoids the performance conflict between the light-shielding agent and the heat-resistant component through the division of labor between the heat-resistant layer and the light-shielding layer. Finally, a composite effect of high temperature resistance, low visible light transmittance, and high peel strength is achieved.

[0051] Compared to the simple structure of existing technologies with a single adhesive layer and a common substrate, the high-temperature resistant light-shielding double-sided adhesive tape of this embodiment significantly improves temperature resistance. Through the synergy of layered high-temperature resistant light-shielding adhesive layers and high-temperature resistant intermediate layers, the tape can be used for a long time in high-temperature environments above 150°C without melting or flowing of the adhesive layer or carbonization of the substrate. This meets the long-term bonding requirements of scenarios such as automotive engine compartments and high-temperature industrial equipment, while the upper limit of existing tapes is usually 120°C. The high-temperature resistant light-shielding double-sided adhesive tape of this embodiment can also achieve light-shielding performance. The layered high-temperature resistant light-shielding adhesive layers enable the light-shielding adhesive layer to achieve low visible light transmittance, while the high-temperature resistant adhesive layer maintains high peel strength. This solves the contradiction of existing technologies where "light-shielding reduces adhesion, and strong adhesion results in poor light-shielding", making it suitable for scenarios such as optical instruments and display backlight modules. The high-temperature resistant, light-shielding double-sided adhesive tape of this embodiment combines versatility and stability. The substrate layer retains the flexibility of cotton paper, making it suitable for bonding various shapes and materials. Furthermore, the addition of polyetheretherketone powder prevents carbonization of the substrate layer and improves the temperature resistance of the adhesive layer.

[0052] In some examples, the structure of the high-temperature resistant light-blocking double-sided adhesive tape of this embodiment is as follows: Figure 1 As shown, the first layered high-temperature resistant light-shielding adhesive layer 10 includes a first high-temperature resistant adhesive layer 11 and a first light-shielding adhesive layer 12. A first high-temperature resistant intermediate layer 50 is located on the side of the first light-shielding adhesive layer 12 away from the first high-temperature resistant adhesive layer 11. The substrate layer 20 and the layered high-temperature resistant light-shielding adhesive layer 10 are connected by a high-temperature resistant intermediate layer 50. The first light-shielding adhesive layer 12 can penetrate to the side of the first high-temperature resistant intermediate layer 50 adjacent to the substrate layer 20, thereby bonding the first high-temperature resistant intermediate layer 50 and the substrate layer 20. Alternatively, other adhesives can be applied between the first high-temperature resistant intermediate layer 50 and the substrate layer 20 to achieve bonding. The second layered high-temperature resistant light-shielding adhesive layer 30 can be substantially symmetrical with respect to the substrate layer 20 with respect to the first layered high-temperature resistant light-shielding adhesive layer 10. The tape comprises a first high-temperature resistant adhesive layer 11, a first light-shielding adhesive layer 12, a first high-temperature resistant intermediate layer 50, a substrate layer 20, a second high-temperature resistant intermediate layer 60, a second light-shielding adhesive layer 32, a second high-temperature resistant adhesive layer 31, and a release layer 40, which are stacked sequentially.

[0053] In some examples, the structure of the high-temperature resistant light-blocking double-sided adhesive tape of this embodiment is as follows: Figure 2 As shown, the first layer of high-temperature resistant light-shielding adhesive layer 10 includes a first high-temperature resistant adhesive layer 11 and a first light-shielding adhesive layer 12. A first high-temperature resistant intermediate layer 50 is located between the first high-temperature resistant adhesive layer 11 and the first light-shielding adhesive layer 12. The first light-shielding adhesive layer 12 also serves to bond the first high-temperature resistant intermediate layer 50 and the substrate layer 20. The second layer of high-temperature resistant light-shielding adhesive layer 30 is substantially symmetrical with respect to the substrate layer 20 relative to the first layer of high-temperature resistant light-shielding adhesive layer 10. The tape includes, in sequence, a first high-temperature resistant adhesive layer 11, a first high-temperature resistant intermediate layer 50, a first light-shielding adhesive layer 12, a substrate layer 20, a second light-shielding adhesive layer 32, a second high-temperature resistant intermediate layer 60, a second high-temperature resistant adhesive layer 31, and a release layer 40.

[0054] In some examples, the substrate layer also contains polyamide epichlorohydrin as a wet strength agent, which can improve the strength of the tissue paper in a wet state, so that the tissue paper maintains structural stability during the tape preparation process.

[0055] In some examples, the substrate layer, by weight, contains 100 parts of cotton paper base material, 5-10 parts of polyetheretherketone powder, and 2-5 parts of polyamide epichlorohydrin, based on the amount of raw materials used in the substrate layer itself. The cotton paper base material may, for example, include cotton paper fibers. Relative to 100 parts by weight of the cotton paper base material, the amount of polyetheretherketone powder can be 5, 6, 7, 8, 9, or 10 parts, and the amount of polyamide epichlorohydrin can be 2, 3, 4, or 5 parts, etc. Using these weight proportions allows the substrate layer to possess both good flexibility and high-temperature resistance to carbonization.

[0056] In some examples, the substrate layer is made of cotton paper, which is a pulp formed by dispersing cotton paper base material, polyetheretherketone powder and polyamide epichlorohydrin. The cotton paper base material, polyetheretherketone powder and polyamide epichlorohydrin are evenly dispersed by pulping, and then the substrate layer can be made by conventional cotton paper process.

[0057] In some examples, the thickness of the substrate layer is 40~80μm, for example, it can be 40μm, 50μm, 60μm, 70μm, 80μm, etc. The pore size is 10~20μm, the air permeability is 50~80mm / s, and the substrate layer is high-permeability cotton paper or high-density cotton paper, which has good density, tensile strength and heat resistance.

[0058] In some examples, the particle size of polyetheretherketone powder is 5~15μm. If the particle size of polyetheretherketone powder is too small, it is easy to agglomerate. If the particle size of polyetheretherketone powder is too large, it will affect the flexibility of cotton paper.

[0059] In some examples, the fiberglass cloth has a thickness of 5~15μm, a basis weight of 10~15g / m², and a pore size of 5~10μm, which can improve high temperature resistance and has a good reinforcing effect.

[0060] In some examples, the first and second high-temperature resistant adhesive layers may have the same or different thicknesses. The thickness of the first or second high-temperature resistant adhesive layer is 6 to 10 μm, such as 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc., and the thickness within the above range enables the high-temperature resistant adhesive layer to have good bonding properties.

[0061] In some examples, the first and second high-temperature resistant adhesive layers can have the same or different compositions. In terms of the amount of raw materials used in the adhesive layer itself, by mass, the first or second high-temperature resistant adhesive layer contains 80-90 parts of a first acrylate monomer polymer, 2-5 parts of silica, and 1-3 parts of a first isocyanate crosslinking agent. For example, the mass parts of the first acrylate monomer polymer can be 80, 81, 82, 83, 84, 85, 86, 87, 89, or 90 parts, the mass parts of silica can be 2, 3, 4, or 5 parts, and the mass parts of the first isocyanate crosslinking agent can be 1, 2, or 3 parts. The resulting adhesive layer has improved high-temperature resistance, does not soften at 150°C, and also has good adhesion with a peel force ≥14N / 24mm.

[0062] In some examples, the monomers of the first acrylate monomer polymer include butyl acrylate, methyl methacrylate, and hydroxyethyl acrylate in a mass ratio of (60~70):(20~30):(5~10), and the resulting first acrylate monomer polymer has a Tg of -30℃ to -20℃. For example, in the first acrylate monomer polymer, in terms of the amount of raw materials used in the first acrylate monomer polymer itself, by mass fraction, the amount of butyl acrylate can be 60 parts, 61 parts, 62 parts, 63 parts, 64 parts, 65 parts, 66 parts, 67 parts, 68 parts, 69 parts, 70 parts, etc.; the amount of methyl methacrylate can be 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, etc.; and the amount of hydroxyethyl acrylate can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc. By combining the above-mentioned proportions of soft monomers, hard monomers, and functional monomers, an adhesive layer with good bonding properties and mechanical strength can be obtained.

[0063] In some examples, the particle size of silica is 1~3μm, which is beneficial for the uniform dispersion of silica in the adhesive layer, thereby better improving the high temperature resistance.

[0064] In some examples, the first and second light-shielding adhesive layers can have the same or different thicknesses. The thickness of the first or second light-shielding adhesive layer is 4 to 8 μm, for example, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, etc. The thickness of the light-shielding adhesive layer within the above range can ensure a low visible light transmittance.

[0065] In some examples, the first or second light-shielding adhesive layer, by weight, contains 75-85 parts of a second acrylate monomer polymer, 2-4 parts of a light-shielding material, 3-5 parts of a plasticizer, and 1-3 parts of a second isocyanate crosslinking agent, based on the amount of raw materials used in the adhesive layer itself. For example, the weight percentages of the second acrylate monomer polymer can be 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, or 85 parts, etc.; the weight percentages of the light-shielding material can be 2, 3, or 4 parts, etc.; the weight percentages of the plasticizer can be 3, 4, or 5 parts, etc.; and the weight percentages of the second isocyanate crosslinking agent can be 1, 2, or 3 parts, etc. Using the above raw materials and formulation, the light-shielding adhesive layer can have good light-shielding properties, with a visible light transmittance of <0.1%. Furthermore, the addition of the plasticizer increases the flexibility of the adhesive layer, preventing the addition of the light-shielding material from causing the adhesive layer to become brittle and prone to cracking.

[0066] In some examples, the second acrylate monomer polymer may be the same as or different from the first acrylate monomer polymer. The polymerizable monomers of the second acrylate monomer polymer include butyl acrylate, methyl methacrylate and hydroxyethyl acrylate in a mass ratio of (60~70):(20~30):(5~10), and the resulting second acrylate monomer polymer has a Tg of -30℃ to -20℃. For example, in the second acrylate monomer polymer, the amount of butyl acrylate by mass fraction can be 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, or 70 parts; the amount of methyl methacrylate can be 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 parts; and the amount of hydroxyethyl acrylate can be 5, 6, 7, 8, 9, or 10 parts. By using the above proportions of soft monomers, hard monomers, and functional monomers, an adhesive layer with good bonding properties and mechanical strength can be obtained.

[0067] In some examples, the light-shielding material is carbon black with a particle size of 20~50nm, which has good light-shielding properties.

[0068] In some examples, the light-blocking material forms a color paste for the top layer of the light-blocking material. The solid content of the color paste is 25-35 wt%, and the color paste also contains a dispersant to facilitate the dispersion of the light-blocking material in the light-blocking adhesive layer. The above-mentioned 2-4 parts of light-blocking material refers to the solid substance of the light-blocking material. If converted to color paste, relative to 75-85 parts of the second acrylate monomer polymer, the amount of color paste can be 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, etc.

[0069] In some examples, the plasticizer is dibutyl phthalate, which is readily available, has good compatibility with light-shielding colloids, and has good plasticizing properties.

[0070] In some examples, the thickness of the release layer is 100~140μm, such as 100μm, 110μm, 120μm, 130μm, 140μm, etc. The release layer can protect the adhesive layer and is easy to peel off during use.

[0071] In some examples, the release layer includes PET and a polydimethylsiloxane release agent coated on the surface of the PET. PET has good mechanical properties, and the polydimethylsiloxane release agent can reduce the release force.

[0072] In some examples, the release force of the release layer is ≤40g / 24mm, ensuring easy peeling without damaging the adhesive layer during use.

[0073] In some examples, the preparation method of the above-mentioned high-temperature resistant light-blocking double-sided cotton paper tape may include the following steps:

[0074] Step 1: Apply a high-temperature resistant adhesive to the surface of the release layer and dry it to obtain a second high-temperature resistant adhesive layer. Then, laminate glass fiber cloth onto the surface of the second high-temperature resistant adhesive layer to form a second high-temperature resistant intermediate layer. Apply a light-shielding adhesive to the surface of the second high-temperature resistant intermediate layer and dry it to obtain a second light-shielding adhesive layer. Finally, laminate a substrate layer onto the surface of the second light-shielding adhesive layer to obtain the first semi-finished product.

[0075] Step 2: Coat the surface of the release paper with a high-temperature resistant adhesive and dry it to obtain the first high-temperature resistant adhesive layer. Then, laminate glass fiber cloth onto the surface of the first high-temperature resistant adhesive layer to form the first high-temperature resistant intermediate layer. Finally, coat the surface of the first high-temperature resistant intermediate layer with a light-shielding adhesive and dry it to form the first light-shielding adhesive layer, thus obtaining the second semi-finished product.

[0076] Step 3: Composite the substrate layer of the first semi-finished product with the first light-shielding adhesive layer of the second semi-finished product to obtain a high-temperature resistant light-shielding cotton paper double-sided adhesive tape.

[0077] The high-temperature resistant, light-shielding cotton paper double-sided adhesive tape of this embodiment can be prepared by the above method. This preparation method has the advantages of strong operability and mass production capability.

[0078] In some examples, the high-temperature resistant adhesive is prepared by adding a first acrylate monomer polymer, silica, isocyanate crosslinking agent, and a first solvent to a stirring device and stirring at a rate of 300-500 r / min for 20-40 min until homogeneous. The first solvent can be removed during the drying process. The first solvent can be, for example, ethyl acetate. The mass proportions of each raw material in the high-temperature resistant adhesive can be 80-90 parts of the first acrylate monomer polymer, 2-5 parts of silica, 1-3 parts of toluene diisocyanate, and 10-20 parts of the first solvent, for example, the solvent can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc.

[0079] In some examples, the preparation method of the light-blocking adhesive is as follows: A second acrylate monomer polymer, a color paste containing the light-blocking material, a plasticizer, an isocyanate crosslinking agent, and a second solvent are added to a stirring device and stirred at a rate of 300-500 r / min for 20-40 min until homogeneous. The second solvent can be removed during the drying process. The second solvent can be, for example, ethyl acetate. The mass percentages of each raw material in the light-blocking adhesive can be 75-85 parts of the second acrylate monomer polymer, 8-12 parts of the color paste containing the light-blocking material, 3-5 parts of dibutyl phthalate, 1-3 parts of toluene diisocyanate, and 10-20 parts of the second solvent. For example, the solvent can be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 parts, etc.

[0080] In some examples, the substrate layer is prepared by adding polyetheretherketone powder and polyamide epichlorohydrin to a pulp with a base material concentration of 10%, stirring at 200-400 r / min for 10-30 min to disperse it evenly, and then making cotton paper according to conventional cotton paper production process, so that the polyetheretherketone powder and polyamide epichlorohydrin are evenly dispersed in the cotton paper.

[0081] In some examples, the color paste is prepared by dispersing the light-shielding material in ethyl acetate / propylene glycol methyl ether containing 0.5-1% dispersant, with a volume ratio of ethyl acetate to propylene glycol of 7:3, which is beneficial for the dispersion of the light-shielding material.

[0082] In some examples, in steps one and two, the drying temperature of the high-temperature resistant adhesive is 80~90℃ and the drying time is 8~15min. After cooling, the glass fiber cloth is laminated. The drying temperature of the light-shielding adhesive is 75~85℃ and the drying time is 5~10min. The second light-shielding adhesive layer in step one is cooled before the substrate layer is laminated, so that the solvent in the adhesive can evaporate and be removed at a stable rate, ensuring the surface smoothness of the adhesive layer.

[0083] In some examples, in step three, after the substrate layer of the first semi-finished product is laminated with the first light-shielding adhesive layer of the second semi-finished product, the resulting tape is wound up and left to stand at room temperature for at least 4 days to ensure that the adhesive layer is fully cured. Before winding, the release paper can be torn open, and the first high-temperature resistant adhesive layer can be bonded to the other surface of the release layer.

[0084] The technical solution of the present invention will be further described in detail below through specific embodiments. In the following embodiments and comparative examples, raw materials with the same name have the same material composition and source.

[0085] The preparation steps of the adhesive tapes in the following examples and comparative examples are as follows.

[0086] (1) Raw material preparation

[0087] Acrylic ester monomer polymers: polymers obtained by polymerizing butyl acrylate, methyl methacrylate and hydroxyethyl acrylate in a mass ratio of 65:25:10, with a Tg of approximately -25℃.

[0088] Light-shielding carbon black paste: 30% solids content, dispersion system is ethyl acetate / propylene glycol methyl ether volume ratio 7:3, contains 0.5% dispersant, and the average particle size of carbon black is about 30nm.

[0089] Silica: Particle size approximately 2μm.

[0090] Crosslinking agent: toluene diisocyanate.

[0091] Plasticizer: Dibutyl phthalate.

[0092] Solvent: Ethyl acetate.

[0093] PET composite release paper, release force ≤40g / 24mm.

[0094] Polyetheretherketone powder: particle size approximately 10 μm.

[0095] (2) Preparation of layered adhesive

[0096] High-temperature resistant adhesive: Add acrylate monomer polymer, silica, toluene diisocyanate and ethyl acetate to a stirring device and stir at 400 r / min for 30 min until uniformly mixed.

[0097] Light-shielding layer adhesive: Add acrylate monomer polymer, light-shielding carbon black paste, dibutyl phthalate, toluene diisocyanate and ethyl acetate to a stirring device and stir at a rate of 500 r / min for 30 min until uniformly mixed.

[0098] (3) Tape making

[0099] ① Underlayer adhesive coating: First, apply a high-temperature resistant underlayer adhesive to the surface of the release layer, control the thickness, put it into an 85℃ oven to dry for 10 minutes, and after cooling to room temperature, laminate glass fiber cloth onto the surface of the underlayer adhesive.

[0100] ② Top layer adhesive coating: Apply a light-shielding top layer adhesive to the surface of the high-temperature resistant intermediate layer, control the thickness, and dry it in an 80℃ oven for 8 minutes. After cooling, laminate it with a high-permeability cotton paper substrate to obtain a semi-finished product of "release layer - layered adhesive (with high-temperature resistant intermediate layer) - substrate".

[0101] ③ Double-sided lamination: Repeat the first half of steps ① and ② to obtain "layered adhesive (with high temperature resistant intermediate layer) - release layer". Lay "layered adhesive (with high temperature resistant intermediate layer) - release layer" on the other side of the substrate of the semi-finished product. After winding, let it stand at room temperature for 4 days to finally obtain high temperature resistant light-blocking cotton paper double-sided adhesive tape.

[0102] If the corresponding raw materials or layer structures are omitted in some comparative examples, then the corresponding steps are also omitted.

[0103] In Comparative Example 4, there was no high-temperature resistant intermediate layer. In step ①-②, after the high-temperature resistant adhesive layer was dried and cooled to room temperature, the light-shielding top layer adhesive was directly applied for step ②.

[0104] In Comparative Example 5, the light-shielding top layer and the high-temperature resistant bottom layer were mixed. The high-temperature resistant bottom layer was prepared by mixing acrylic monomer polymers, silica, toluene diisocyanate, and ethyl acetate in a mass ratio of 85:3:2:15. The light-shielding top layer was prepared by mixing acrylic monomer polymers, light-shielding carbon black paste, dibutyl phthalate, toluene diisocyanate, and ethyl acetate in a mass ratio of 80:10:4:2:15. The high-temperature resistant bottom layer and the light-shielding top layer were then mixed in a ratio of 8:6 to prepare a mixed adhesive. In step ①, the mixed adhesive was first applied to the surface of the release layer, with a thickness of 8 μm. The layer was then dried in an 85°C oven for 10 min. After cooling to room temperature, fiberglass cloth was laminated onto the bottom layer. In step ②, the mixed adhesive was applied to the surface of the bottom layer, with a thickness of 6 μm. The layer was then dried in an 80°C oven for 8 min. After cooling, a high-permeability cotton paper substrate was laminated onto the bottom layer.

[0105] In Comparative Example 9, no plasticizer was used; that is, dibutyl phthalate was not added during the preparation of the light-shielding layer adhesive.

[0106] (4) Performance testing

[0107] Temperature resistance: Place in a 150℃ oven for 24 hours, observe whether the adhesive layer melts or carbonizes, and test the peel strength.

[0108] Light blocking: Tests light transmittance.

[0109] Flexibility: Bend 180° 10 times and observe whether it cracks.

[0110] The raw material usage and test results for each embodiment and comparative example are shown in Tables 1 and 2 below. In the tables, the raw material usage for each layer refers only to that layer, and the raw material usage for different layers is not mixed. The relationship between the usage of different layers is reflected by the thickness.

[0111] Table 1. Raw material usage and test results for Examples 1 to 7

[0112]

[0113] Table 2. Raw material usage and test results for Comparative Examples 1 to 9

[0114]

[0115] As can be seen from the test results of the above embodiments and comparative examples, the tapes obtained in Examples 1 to 7 within the scope of protection of this invention can be used for a long time at 150°C, with a peel force ≥14N / 24mm, and can withstand high temperatures. Even after high-temperature treatment, they still have good adhesive properties, and the light transmittance is less than or equal to 0.1%, indicating good light-blocking properties. After high and low temperature cycling (-20°C to 150°C), the tack decay rate of the embodiments of this invention is <10%, and their performance stability is superior to existing products.

[0116] In Comparative Example 1, the substrate layer was not modified with polyetheretherketone (PEEK) powder, resulting in poor high-temperature resistance and carbonization. The overall high-temperature resistance of the tape was poor, and the adhesive layer melted. In Comparative Example 2, excessive PEEK powder made the paper brittle and prone to cracking. In Comparative Example 3, insufficient PEEK powder resulted in poor high-temperature resistance, carbonization, and adhesive layer melting. In Comparative Example 4, the absence of a high-temperature resistant intermediate layer reduced the overall high-temperature resistance of the tape, leading to carbonization and adhesive layer melting. In Comparative Example 5, mixing light-blocking and high-temperature resistant adhesives deteriorated the mechanical properties of the adhesive layer, causing cracking. In Comparative Example 6, insufficient carbon black resulted in poor light-blocking properties. In Comparative Example 7, excessive carbon black caused the adhesive layer to become brittle and crack. In Comparative Example 8, excessive plasticizer caused the adhesive layer to melt and become sticky. In Comparative Example 9, no plasticizer was added, resulting in adhesive layer cracking. The above comparative examples do not achieve the technical effects of this invention.

[0117] Finally, it should be emphasized that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-temperature resistant, light-shielding double-sided cotton paper tape, characterized in that... It includes a first layer of high-temperature resistant light-shielding adhesive layer, a substrate layer, a second layer of high-temperature resistant light-shielding adhesive layer and a release layer, which are stacked in sequence, as well as a first high-temperature resistant intermediate layer disposed on the first layer of high-temperature resistant light-shielding adhesive layer and a second high-temperature resistant intermediate layer disposed on the second layer of high-temperature resistant light-shielding adhesive layer. The substrate layer is a cotton paper containing polyetheretherketone powder; The first high-temperature resistant intermediate layer and the second high-temperature resistant intermediate layer each comprise glass fiber cloth; The first layered high-temperature resistant light-shielding adhesive layer includes a first light-shielding adhesive layer and a first high-temperature resistant adhesive layer, wherein the first light-shielding adhesive layer is closer to the substrate layer than the first high-temperature resistant adhesive layer. The second layer of high-temperature resistant light-shielding adhesive layer includes a second light-shielding adhesive layer and a second high-temperature resistant adhesive layer, wherein the second light-shielding adhesive layer is closer to the substrate layer than the second high-temperature resistant adhesive layer. The first high-temperature resistant adhesive layer and the second high-temperature resistant adhesive layer contain silicon dioxide, and the first light-shielding adhesive layer and the second light-shielding adhesive layer contain light-shielding materials.

2. The high-temperature resistant, light-shielding double-sided cotton paper tape according to claim 1, characterized in that... The substrate layer also contains polyamide epichlorohydrin; By weight, the substrate layer contains 100 parts of cotton paper base material, 5-10 parts of polyether ether ketone powder, and 2-5 parts of polyamide epichlorohydrin; The substrate layer is a paper made of paper pulp formed by dispersing paper base material, polyetheretherketone powder and polyamide epichlorohydrin; The thickness of the substrate layer is 40~80μm, the pore size is 10~20μm, and the air permeability is 50~80mm / s; The particle size of the polyetheretherketone powder is 5~15μm.

3. A high-temperature resistant, light-shielding double-sided adhesive tape for cotton paper according to claim 1 or 2, characterized in that... The glass fiber cloth has a thickness of 5~15μm, a basis weight of 10~15g / m², and a pore size of 5~10μm.

4. A high-temperature resistant, light-shielding double-sided adhesive tape for cotton paper according to claim 1 or 2, characterized in that... The thickness of the first high-temperature resistant adhesive layer or the second high-temperature resistant adhesive layer is 6~10μm; By weight, the first high-temperature resistant adhesive layer or the second high-temperature resistant adhesive layer contains 80-90 parts of a first acrylate monomer polymer, 2-5 parts of silica, and 1-3 parts of a first isocyanate crosslinking agent; the polymeric monomers of the first acrylate monomer polymer include butyl acrylate, methyl methacrylate, and hydroxyethyl acrylate in a mass ratio of (60-70):(20-30):(5-10), and the Tg of the first acrylate monomer polymer is -30℃ to -20℃; The silica has a particle size of 1~3μm.

5. A high-temperature resistant, light-shielding double-sided adhesive tape for cotton paper according to claim 1 or 2, characterized in that... The thickness of the first or second light-shielding adhesive layer is 4~8μm; By weight, the first or second light-shielding adhesive layer contains 75-85 parts of a second acrylate monomer polymer, 2-4 parts of light-shielding material, 3-5 parts of plasticizer, and 1-3 parts of a second isocyanate crosslinking agent; the polymer monomers of the second acrylate monomer polymer include butyl acrylate, methyl methacrylate, and hydroxyethyl acrylate in a mass ratio of (60-70):(20-30):(5-10), and the Tg of the second acrylate monomer polymer is -30℃ to -20℃; The light-shielding material is carbon black with a particle size of 20~50nm; The light-shielding material forms a color paste for use in the light-shielding top layer. The solid content of the color paste is 25-35 wt%, and the color paste also contains a dispersant. The plasticizer is dibutyl phthalate.

6. A high-temperature resistant, light-shielding double-sided adhesive tape for cotton paper according to claim 1 or 2, characterized in that... The thickness of the release layer is 100~140μm; The release layer includes PET and a polydimethylsiloxane release agent coated on the surface of PET; The release force of the release layer is ≤40g / 24mm.

7. A method for preparing a high-temperature resistant, light-shielding double-sided cotton paper tape according to any one of claims 1 to 6, characterized in that... Includes the following steps: Step 1: Apply a high-temperature resistant adhesive to the surface of the release layer and dry it to obtain a second high-temperature resistant adhesive layer. Then, laminate glass fiber cloth onto the surface of the second high-temperature resistant adhesive layer to form a second high-temperature resistant intermediate layer. Apply a light-shielding adhesive to the surface of the second high-temperature resistant intermediate layer and dry it to obtain a second light-shielding adhesive layer. Finally, laminate a substrate layer onto the surface of the second light-shielding adhesive layer to obtain the first semi-finished product. Step 2: Coat the surface of the release paper with a high-temperature resistant adhesive and dry it to obtain the first high-temperature resistant adhesive layer. Then, laminate glass fiber cloth onto the surface of the first high-temperature resistant adhesive layer to form the first high-temperature resistant intermediate layer. Finally, coat the surface of the first high-temperature resistant intermediate layer with a light-shielding adhesive and dry it to form the first light-shielding adhesive layer, thus obtaining the second semi-finished product. Step 3: Composite the substrate layer of the first semi-finished product with the first light-shielding adhesive layer of the second semi-finished product to obtain a high-temperature resistant light-shielding cotton paper double-sided adhesive tape.

8. The preparation method according to claim 7, characterized in that... The preparation method of the high-temperature resistant adhesive is as follows: the first acrylate monomer polymer, silica, isocyanate crosslinking agent and the first solvent are added to the stirring device and stirred at a rate of 300~500r / min for 20~40min until they are mixed evenly; The preparation method of the light-shielding adhesive is as follows: the second acrylate monomer polymer, the color paste containing the light-shielding material, the plasticizer, the isocyanate crosslinking agent and the second solvent are added to the stirring equipment and stirred at a rate of 300~500r / min for 20~40min until they are mixed evenly. The preparation method of the substrate layer is as follows: add polyether ether ketone powder and polyamide epichlorohydrin to pulp with a base material concentration of 10%, stir at 200~400r / min for 10~30min, disperse evenly, and then make cotton paper; The color paste is prepared by dispersing the light-shielding material in ethyl acetate / propylene glycol methyl ether containing 0.5-1% dispersant, wherein the volume ratio of ethyl acetate to propylene glycol is 7:

3.

9. The preparation method according to claim 7, characterized in that... In steps one and two, the drying temperature of the high-temperature resistant adhesive is 80~90℃, the drying time is 8~15min, and the glass fiber cloth is laminated after cooling. The drying temperature of the light-shielding adhesive is 75~85℃, the drying time is 5~10min. The second light-shielding adhesive layer in step one is laminated with the substrate layer after cooling. In step three, after the substrate layer of the first semi-finished product is laminated with the first light-shielding adhesive layer of the second semi-finished product, the resulting tape is rolled up and left to stand at room temperature for at least 4 days.

10. The application of a high-temperature resistant, light-shielding double-sided adhesive tape made of cotton paper, characterized in that... The high-temperature resistant light-shielding cotton paper double-sided tape is a high-temperature resistant light-shielding cotton paper double-sided tape as described in any one of claims 1 to 6 or a high-temperature resistant light-shielding cotton paper double-sided tape obtained by the preparation method described in any one of claims 7 to 9. The high-temperature resistant light-shielding cotton paper double-sided tape is used for the installation of electronic components in automobile engine compartments, the installation of electronic components inside high-temperature industrial equipment, the manufacturing of optical instruments, or the production of displays.

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