A multi-layer flame-retardant adhesive tape

Abstract

This utility model relates to the field of adhesive tape technology, specifically a multilayer flame-retardant adhesive tape, comprising a tape body, the tape body comprising, from top to bottom, a flame-retardant isolation layer, a first flame-retardant pressure-sensitive adhesive layer, a reinforcing substrate layer, a second flame-retardant pressure-sensitive adhesive layer, and a release layer, stacked sequentially. The flame-retardant isolation layer is a polymer film layer coated with a flame retardant. The first and second flame-retardant pressure-sensitive adhesive layers are both pressure-sensitive adhesive layers with added intumescent flame retardants. The release layer is a film layer coated with an organosilicon release agent. Beneficial effects: By designing a multilayer composite structure of a flame-retardant isolation layer, double-sided flame-retardant pressure-sensitive adhesive layers, and a reinforcing flame-retardant substrate layer, the flame-retardant isolation layer, as the outermost layer, primarily provides physical isolation and flame retardancy. The middle reinforcing substrate layer itself is flame-retardant and provides mechanical support. The double-sided flame-retardant pressure-sensitive adhesive layers can form an intumescent char layer when heated, effectively isolating heat and oxygen. Each layer can produce a synergistic flame-retardant effect during combustion.

Description

Technical Field

[0001] This utility model relates to the field of adhesive tape technology, specifically to a multi-layer flame-retardant adhesive tape. Background Technology

[0002] Adhesive tape, as an important industrial material and daily consumer product, is widely used in electronics, automobiles, construction, and other fields for insulation, fixing, shielding, and surface protection. In many applications, especially those involving power or high-temperature environments, stringent requirements are placed on the flame-retardant properties of adhesive tape. Ordinary adhesive tape typically consists of a base material and a pressure-sensitive adhesive layer, and its materials are mostly plastics or fabrics. These materials are highly flammable when exposed to open flames or high temperatures, posing a significant safety hazard.

[0003] Currently, to improve the flame retardancy of adhesive tapes, the common method is to add flame retardants, such as halogenated, phosphorus-based, nitrogen-based, or inorganic aluminum hydroxide and magnesium hydroxide, to the substrate or adhesive. However, simply adding flame retardants has some problems: First, adding large amounts of flame retardants may affect the mechanical properties of the substrate itself and the adhesive properties of the adhesive, leading to brittle tape and a decrease in initial tack and holding power; second, some flame retardants may migrate or leach out, affecting long-term flame retardant performance and product appearance; third, some flame retardants may produce large amounts of smoke or toxic and harmful gases when burning.

[0004] Therefore, we propose a multi-layer flame-retardant tape to solve the above problems. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model discloses a multilayer flame-retardant tape. The technical solution adopted is that it includes a tape body, which includes a flame-retardant isolation layer, a first flame-retardant pressure-sensitive adhesive layer, a reinforcing substrate layer, a second flame-retardant pressure-sensitive adhesive layer, and a release layer stacked from top to bottom. The flame-retardant isolation layer is a polymer film layer coated with a flame retardant. The first and second flame-retardant pressure-sensitive adhesive layers are both pressure-sensitive adhesive layers with added intumescent flame retardants. The release layer is a film layer coated with an organosilicon release agent.

[0006] As a preferred embodiment of this invention, the reinforcing substrate layer is a nonwoven fabric structure made of flame-retardant polymer.

[0007] As a preferred embodiment of this invention, the reinforcing substrate layer is a mesh structure made of flame-retardant polymer.

[0008] As a preferred embodiment of this invention, the material of the reinforcing substrate layer is one of flame-retardant modified polyethylene terephthalate, polyimide, polyamide, or aramid.

[0009] As a preferred embodiment of this invention, the basis weight of the reinforcing substrate layer is 30-100 g / m². 2 .

[0010] As a preferred embodiment of this utility model, the flame-retardant isolation layer is made of flame-retardant treated polyester film, polyimide film or polyethylene film, with a thickness of 10-50 μm.

[0011] As a preferred embodiment of this invention, the thickness of the first flame-retardant pressure-sensitive adhesive layer and the second flame-retardant pressure-sensitive adhesive layer are each 10-50 μm.

[0012] As a preferred technical solution of this utility model, the intumescent flame retardant is a phosphorus-nitrogen compound intumescent flame retardant, and its addition amount accounts for 15%-40% of the total mass of the pressure-sensitive adhesive layer.

[0013] As a preferred embodiment of this invention, the flame retardant is an inorganic hydroxide flame retardant coating.

[0014] As a preferred embodiment of this invention, the release layer is a polyester film or a polypropylene film coated with an organosilicon release agent.

[0015] The beneficial effects of this utility model are as follows: By designing a multi-layer composite structure consisting of a flame-retardant isolation layer, a double-sided flame-retardant pressure-sensitive adhesive layer, and a reinforced flame-retardant substrate layer, the flame-retardant isolation layer, as the outermost layer, first plays a role in physical isolation and flame retardancy. The middle reinforced substrate layer itself has flame retardancy and provides mechanical support. The double-sided flame-retardant pressure-sensitive adhesive layer can form an expanded char layer when heated, effectively isolating heat and oxygen. Each layer can produce a synergistic flame-retardant effect during combustion, greatly improving the overall flame retardancy level. The introduction of the reinforced substrate layer significantly improves the tensile strength, tear resistance, and flexibility of the tape, making it less prone to breakage during use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of Embodiment 1 of the present utility model;

[0019] Figure 3 This is a cross-sectional structural diagram of Embodiment 2 of the present invention.

[0020] In the diagram: 1. Tape body, 2. Flame-retardant isolation layer, 3. First flame-retardant pressure-sensitive adhesive layer, 4. Reinforcing substrate layer, 5. Second flame-retardant pressure-sensitive adhesive layer, 6. Release layer. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] like Figures 1 to 2 As shown, this utility model discloses a multilayer flame-retardant tape. The technical solution adopted is as follows: the tape body 1 includes a flame-retardant isolation layer 2, a first flame-retardant pressure-sensitive adhesive layer 3, a reinforcing substrate layer 4, a second flame-retardant pressure-sensitive adhesive layer 5, and a release layer 6, which are stacked sequentially from top to bottom. The flame-retardant isolation layer 2 is a polymer film layer coated with a flame retardant. The first flame-retardant pressure-sensitive adhesive layer 3 and the second flame-retardant pressure-sensitive adhesive layer 5 are both pressure-sensitive adhesive layers with added intumescent flame retardants. The release layer 6 is a film layer coated with an organosilicon release agent.

[0024] As a preferred technical solution of this utility model, the reinforcing substrate layer 4 is a non-woven fabric structure made of flame-retardant polymer.

[0025] As a preferred technical solution of this utility model, the material of the reinforcing substrate layer 4 is one of flame-retardant modified polyethylene terephthalate, polyimide, polyamide or aramid.

[0026] As a preferred embodiment of this invention, the basis weight of the reinforcing substrate layer 4 is 30-100 g / m². 2 .

[0027] As a preferred technical solution of this utility model, the flame-retardant isolation layer 2 is made of flame-retardant treated polyester film, polyimide film or polyethylene film, with a thickness of 10-50μm.

[0028] As a preferred technical solution of this utility model, the thickness of the first flame-retardant pressure-sensitive adhesive layer 3 and the second flame-retardant pressure-sensitive adhesive layer 5 are each independently 10-50μm.

[0029] As a preferred technical solution of this utility model, the intumescent flame retardant is a phosphorus-nitrogen compound intumescent flame retardant, and its addition amount accounts for 15%-40% of the total mass of the pressure-sensitive adhesive layer.

[0030] As a preferred technical solution of this utility model, the flame retardant is an inorganic hydroxide flame retardant coating.

[0031] As a preferred embodiment of this utility model, the release layer 6 is a polyester film or a polypropylene film coated with an organosilicon release agent.

[0032] Example 2

[0033] like Figures 1 to 3 As shown, this utility model discloses a multilayer flame-retardant tape. The technical solution adopted is as follows: the tape body 1 includes a flame-retardant isolation layer 2, a first flame-retardant pressure-sensitive adhesive layer 3, a reinforcing substrate layer 4, a second flame-retardant pressure-sensitive adhesive layer 5, and a release layer 6, which are stacked sequentially from top to bottom. The flame-retardant isolation layer 2 is a polymer film layer coated with a flame retardant. The first flame-retardant pressure-sensitive adhesive layer 3 and the second flame-retardant pressure-sensitive adhesive layer 5 are both pressure-sensitive adhesive layers with added intumescent flame retardants. The release layer 6 is a film layer coated with an organosilicon release agent.

[0034] As a preferred technical solution of this utility model, the reinforcing substrate layer 4 is a mesh structure made of flame-retardant polymer.

[0035] As a preferred technical solution of this utility model, the material of the reinforcing substrate layer 4 is one of flame-retardant modified polyethylene terephthalate, polyimide, polyamide or aramid.

[0036] As a preferred embodiment of this invention, the basis weight of the reinforcing substrate layer 4 is 30-100 g / m². 2 .

[0037] As a preferred technical solution of this utility model, the flame-retardant isolation layer 2 is made of flame-retardant treated polyester film, polyimide film or polyethylene film, with a thickness of 10-50μm.

[0038] As a preferred technical solution of this utility model, the thickness of the first flame-retardant pressure-sensitive adhesive layer 3 and the second flame-retardant pressure-sensitive adhesive layer 5 are each independently 10-50μm.

[0039] As a preferred technical solution of this utility model, the intumescent flame retardant is a phosphorus-nitrogen compound intumescent flame retardant, and its addition amount accounts for 15%-40% of the total mass of the pressure-sensitive adhesive layer.

[0040] As a preferred technical solution of this utility model, the flame retardant is an inorganic hydroxide flame retardant coating.

[0041] As a preferred embodiment of this utility model, the release layer 6 is a polyester film or a polypropylene film coated with an organosilicon release agent.

[0042] Example 3

[0043] Flame-retardant isolation layer 2: A 25μm thick polyester film is selected, and a flame-retardant coating containing aluminum hydroxide is coated on one side. After drying, the thickness of the flame-retardant coating is about 5μm.

[0044] The first flame-retardant pressure-sensitive adhesive layer 3 and the second flame-retardant pressure-sensitive adhesive layer 5 are made of acrylic pressure-sensitive adhesive, to which 25% of the total mass of the pressure-sensitive adhesive is added. They are coated on both sides of the reinforcing substrate layer 4 by a coating machine. After drying, the thickness of each adhesive layer is about 30μm.

[0045] Reinforcing substrate layer 4: 60 g / m² 2 Flame-retardant treated polyester mesh nonwoven fabric.

[0046] Release layer 6: A polyester film with a thickness of 50μm coated with an organosilicon release agent is selected.

[0047] The layers are laminated together using a pressing process, then wound up and cured before being slit to obtain the required width of tape.

[0048] Example 4

[0049] Flame-retardant isolation layer 2: A flame-retardant polyimide film with a thickness of 38μm is selected.

[0050] First flame-retardant pressure-sensitive adhesive layer 3 and second flame-retardant pressure-sensitive adhesive layer 5: rubber-based pressure-sensitive adhesive is used, and an intumescent flame-retardant system composed of microencapsulated red phosphorus and pentaerythritol is added, accounting for 30% of the total mass of the pressure-sensitive adhesive. After drying, the thickness of each adhesive layer is about 20μm.

[0051] Reinforcing substrate layer 4: 45 g / m² 2 Aramid nonwoven fabric.

[0052] Release layer 6: A 75μm thick polypropylene film coated with an organosilicon release agent is selected.

[0053] The preparation process is the same as in Example 1.

[0054] Components not described in detail in this article are existing technologies.

[0055] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.

Claims

1. A multi-layered flame-retardant adhesive tape comprising a tape body (1), characterized in that, The tape body (1) includes a flame-retardant isolation layer (2), a first flame-retardant pressure-sensitive adhesive layer (3), a reinforcing substrate layer (4), a second flame-retardant pressure-sensitive adhesive layer (5), and a release layer (6) stacked sequentially from top to bottom. The flame-retardant isolation layer (2) is a polymer film layer coated with a flame retardant. The first flame-retardant pressure-sensitive adhesive layer (3) and the second flame-retardant pressure-sensitive adhesive layer (5) are both pressure-sensitive adhesive layers with added intumescent flame retardants. The release layer (6) is a film layer coated with an organosilicon release agent.

2. The multi-layer flame resistant tape of claim 1, wherein, The reinforcing substrate layer (4) is a non-woven fabric structure made of flame-retardant polymer.

3. The multi-layer flame resistant tape of claim 1, wherein, The reinforcing substrate layer (4) is a mesh structure made of flame-retardant polymer.

4. The multi-layer flame-retardant adhesive tape according to claim 2 or 3, characterized in that, The material of the reinforcing substrate layer (4) is one of flame-retardant modified polyethylene terephthalate, polyimide, polyamide or aramid.

5. The multi-layer flame resistant tape of claim 4, wherein, The reinforcing substrate layer (4) has a grammage of 30-100 g / m 2 .

6. The multilayer flame-retardant tape according to claim 1, characterized in that, The flame-retardant isolation layer (2) is made of flame-retardant polyester film, polyimide film or polyethylene film, with a thickness of 10-50 μm.

7. The multi-layer flame resistant tape of claim 1, wherein, The thickness of the first flame-retardant pressure-sensitive adhesive layer (3) and the second flame-retardant pressure-sensitive adhesive layer (5) are each 10-50 μm.

8. The multi-layer flame-retardant adhesive tape according to claim 1 or 7, wherein The intumescent flame retardant is a phosphorus-nitrogen compound intumescent flame retardant, and its addition amount accounts for 15%-40% of the total mass of the pressure-sensitive adhesive layer.

9. The multi-layer flame-retardant adhesive tape according to claim 1 or 8, wherein The flame retardant is an inorganic hydroxide flame retardant coating.

10. The multi-layer flame resistant tape of claim 1, wherein, The release layer (6) is a polyester film or a polypropylene film coated with an organosilicon release agent.

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