Flame-retardant tissue paper adhesive tape as well as preparation method and application thereof

Abstract

The invention relates to the technical field of adhesive tapes, in particular to a tissue paper flame-retardant adhesive tape and a preparation method and application thereof.The tissue paper flame-retardant adhesive tape sequentially comprises a flame-retardant acrylic acid pressure-sensitive adhesive layer, a tissue paper layer, a flame-retardant acrylic acid pressure-sensitive adhesive layer and a release layer from top to bottom, comprising the following raw materials in parts by weight: 95-100 parts of acrylic resin, 15-25 parts of flame-retardant powder and 0.5-1.5 parts of a curing agent. The prepared tissue paper adhesive tape is good in cohesiveness and has a good flame retardant effect.

Description

Technical Field

[0001] This invention relates to the field of adhesive tape technology, specifically to a flame-retardant paper tape, its preparation method, and its application. Background Technology

[0002] In modern industrial production and daily life, adhesive tape is a commonly used bonding material with extremely wide applications. Among them, tissue paper tape, with its advantages of soft texture, good adhesion, and excellent breathability, is highly favored in many industries such as electronics, automotive, packaging, and construction. For example, in the electronics industry, tissue paper tape can be used for fixing, insulating, and protecting electronic components; in automotive manufacturing, it can be used for bonding and sealing automotive interiors; in the packaging industry, it is commonly used for product packaging and labeling; and in the construction field, it can be used for wall decoration and gap filling. To improve the performance of tissue paper tape, researchers in this field have conducted extensive research.

[0003] For example, patent CN108410377B discloses a method for preparing anti-tampering cotton paper tape. The specific steps are as follows: A preferred acrylic pressure-sensitive adhesive, a silane coupling agent, and an isocyanate crosslinking agent are mixed evenly. The tape is coated onto a substrate film, dried, and then cotton paper is attached. Adhesive is then applied to the cotton paper, dried, and rolled up. If the tape is torn after use, the cotton paper inside will be 100% destroyed, and the packaging paper will also be damaged. Used in the express packaging industry, it can effectively prevent theft and secondary packaging.

[0004] Patent CN117050663A discloses the preparation of an acrylic adhesive and its application in tissue paper tape, specifically relating to the field of acrylic adhesive technology, including the following components and their weight parts: thickener 3 10 parts, accelerator 1 3 parts, methyl methacrylate 10 30 parts, plasticizer 1 4 parts, epoxy resin 3 6 portions, bamboo charcoal fiber 2 6 portions, deionized water 1 5 parts, crosslinking agent 1 3 parts, defoamer 0.8g 1.4 parts, talcum powder 1 3 parts and antifreeze 0.8 1.6 parts. The acrylic adhesive prepared by this invention has significantly improved bonding strength, durability, heat and cold resistance, and flowability compared to the comparative ratio. It has strong alkali resistance and adhesion to paint films. In particular, the antibacterial, bacteriostatic, deodorizing, and UV-resistant effects of the acrylic adhesive are enhanced, especially for metals. Moreover, the prepared acrylic adhesive has a low amount of internal air bubbles.

[0005] While the above patents have improved some properties of cotton paper tape from different perspectives, there is relatively little research on flame retardancy. Flame retardancy affects the application range of cotton paper tape. Therefore, there is an urgent need for a flame retardant cotton paper tape on the market. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a paper flame-retardant tape with good adhesion and flame retardant effect.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of the present invention provides a cotton paper flame-retardant tape, which comprises, from top to bottom, a flame-retardant acrylic pressure-sensitive adhesive layer, a cotton paper layer, a flame-retardant acrylic pressure-sensitive adhesive layer, and a release layer. The flame-retardant acrylic pressure-sensitive adhesive layer is prepared by weight of the following raw materials: 95-100 parts of acrylic resin, 15-25 parts of flame retardant powder, and 0.5-1.5 parts of curing agent.

[0008] In some embodiments, the curing agent is an isocyanate.

[0009] In some embodiments, the method for preparing the acrylic resin includes the following steps: (1) Add the basic monomer and the functional monomer to the solvent and stir at 60-70℃ to obtain a mixture; (2) Add the initiator to the solvent to obtain an initiator solution. Under a nitrogen atmosphere at 70-80℃, add part of the initiator solution to the mixture in step (1) and stir for 0.5-1.5h. Then add the remaining initiator solution and stir for 4-5h at 80-90℃. Then cool to 30-40℃, add tackifying resin and solvent to obtain acrylic resin.

[0010] In some embodiments, the base monomers include trimethylolpropane triacrylate, 3,4-dihydroxystyrene, and acrylic acid in a mass ratio of (1-2):(1.5-2):1.

[0011] In some embodiments, the method for preparing the functional monomer includes the following steps: (1) Add pentaerythritol phosphate and acrylic acid to 1,2-dichloroethane, then add a catalyst, react at 55-65℃ for 5-6 h, and then precipitate by column chromatography to obtain the compound; (2) Add the compound obtained in step (1), chitosan, and sodium ethoxide to anhydrous ethanol, react at 55-65℃ for 30-60 min, and then wash, filter, and dry to obtain the functional monomer.

[0012] Acrylic resin can be used as the main raw material for acrylic pressure-sensitive adhesives, exhibiting good bonding performance. However, for some special applications, not only good bonding performance is required, but also a certain degree of flame retardancy. This invention uses basic monomers and functional monomers containing active groups and good heat resistance as raw materials to prepare acrylic resins with good bonding strength and flame retardancy. The possible reason is that the basic monomers with multiple active groups form a cross-linked structure with the curing agent, increasing the cohesive strength between the monomers and increasing the heat resistance of acrylic acid. In addition, after reacting pentaerythritol phosphate with acrylic acid, chitosan is grafted onto it. Chitosan contains multiple active groups, which further enhances the degree of cross-linking of the acrylic resin, forming a network structure. At the same time, flame-retardant groups are introduced into the resin matrix, giving the acrylic resin flame retardancy. Furthermore, the multiple active groups of chitosan can enhance the affinity between the pressure-sensitive adhesive and the substrate. Moreover, with the presence of the network cross-linked structure and multiple active groups, the tackifying resin and flame-retardant powder can be "fixed" in the network, thus improving both the bonding performance and flame retardancy.

[0013] In some embodiments, the mass ratio of the compound and chitosan in step (2) is 1:(0.1-0.4).

[0014] In some embodiments, the mass ratio of the base monomer to the functional monomer is 1:(0.5-0.8).

[0015] In some embodiments, the method for preparing the flame retardant powder includes the following steps: Magnesium hydroxide and silane coupling agent are added to ethanol and stirred at 40-50℃ for 30-60 min. Then, an initiator and 4-methacryloyloxybenzophenone are added and the temperature is raised to 55-65℃ for 1-2 h. The mixture is then filtered and washed to obtain flame retardant powder.

[0016] In some embodiments, the mass ratio of magnesium hydroxide to 4-methacryloyloxybenzophenone is 1:(0.2-0.5).

[0017] Magnesium hydroxide, when added as a flame retardant powder to acrylic resin systems, exhibits poor compatibility, is prone to secondary agglomeration, and has unsatisfactory flame retardancy. This invention addresses this by modifying magnesium hydroxide with silane and then reacting it with 4-methacryloyloxybenzophenone, thereby increasing its compatibility with acrylic resin. Simultaneously, the presence of alkane segments compensates for the poor adhesion of the pressure-sensitive adhesive caused by excessive crosslinking density and the presence of numerous benzene ring structures. Furthermore, the carbonyl group in the benzophenone structure may act as a hydrogen bond acceptor, forming a dynamic crosslinking network with the hydroxyl or carboxyl groups in the acrylic resin, thus improving the system's viscosity and cohesive strength, and enhancing the flame retardancy and adhesion of the pressure-sensitive adhesive.

[0018] A second aspect of this invention provides a method for preparing a paper flame-retardant tape, comprising the following steps: S1. Stir acrylic resin, flame retardant powder and curing agent at 20-30℃ for 20-30 minutes to obtain a mixture; S2. The mixture obtained in step S1 is uniformly coated onto the upper and lower surfaces of the cotton paper layer under dust-free conditions, with a coating thickness of 20-25μm. After drying at 85-95℃, a flame-retardant acrylic pressure-sensitive adhesive layer is obtained. Then, the release layer is unwound onto the flame-retardant acrylic pressure-sensitive adhesive layer on the lower surface of the cotton paper layer and wound up to obtain a flame-retardant cotton paper tape.

[0019] A third aspect of the present invention provides an application of a flame-retardant paper tape, which is used for bonding and fixing heat insulation cotton, polyurethane foam, PC insulation board, and cushioning foam.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention prepares a flame-retardant acrylic pressure-sensitive adhesive by using acrylic resin, flame-retardant powder, and curing agent. Then, a flame-retardant acrylic pressure-sensitive adhesive layer, a cotton paper layer, a flame-retardant acrylic pressure-sensitive adhesive layer, and a release layer are composited to obtain a cotton paper flame-retardant tape with high peel strength and good adhesion.

[0021] 2. This invention selects basic monomers containing active groups and good heat resistance, and prepares functional monomers by grafting chitosan onto pentaerythritol phosphate after reacting it with acrylic acid. The cross-linked structure formed by the monomers and curing agent increases the cohesive strength between the monomers, enhances the degree of cross-linking of the acrylic resin, and facilitates the formation of a network structure. At the same time, flame-retardant groups are introduced into the resin matrix, giving the acrylic resin flame retardancy. Moreover, in the presence of the network cross-linked structure and multiple active groups, the tackifying resin and flame-retardant powder can be "fixed" in the network, thus improving both the bonding effect and the flame retardancy.

[0022] 3. This invention improves the compatibility of magnesium hydroxide with acrylic resin by modifying it with silane and then reacting it with 4-methacryloyloxybenzophenone. At the same time, the presence of alkane segments compensates for the problem of poor adhesion of pressure-sensitive adhesive caused by excessive crosslinking density and the presence of a large number of benzene ring structures. It also improves the viscosity and cohesive strength of the system, and enhances the flame retardancy and adhesion of the pressure-sensitive adhesive. Detailed Implementation

[0023] The present invention will be described below with reference to specific embodiments. It should be noted that the examples and comparative examples below are for illustrative purposes only and are not intended to limit the invention. Other combinations and various modifications within the scope of the invention can be made without departing from its spirit or scope.

[0024] To facilitate implementation of this invention by those skilled in the art, the following description is provided regarding some of the raw materials and manufacturers used in the embodiments and comparative examples: The compounds and related reagents used in the following examples and comparative examples are all commercially available. The release layer is a double-silicone release paper with a thickness of 0.115 mm; the cotton paper layer has a thickness of 100 μm; the terpene resin is of type T100; and the magnesium hydroxide has a particle size of 50-100 nm.

[0025] Preparation Example 1 The preparation method of functional monomer-1 includes the following steps: (1) Add 18g pentaerythritol phosphate and 72g acrylic acid to 500ml of 1,2-dichloroethane, then add 0.9g of 85wt% concentrated sulfuric acid, react at 60℃ for 5.5h, and then precipitate by column chromatography to obtain the compound; (2) Add 10g of the compound, 2g of chitosan and 0.1g of sodium ethoxide obtained in step (1) to 100ml of anhydrous ethanol, react at 60℃ for 45min, wash, filter and dry to obtain functional monomer-1.

[0026] Preparation Example 2 The preparation method of functional monomer-2 is the same as that in preparation example 1, except that the amount of chitosan added is 0.7g.

[0027] Preparation Example 3 The preparation method of acrylic resin-1 includes the following steps: (1) Add 10g of the basic monomer and 7g of the functional monomer-1 to 17ml of toluene and stir at 65℃ to obtain a mixture; (2) Add 0.1g of azobisisobutyronitrile to 5ml of toluene to obtain an azobisisobutyronitrile solution. Under a nitrogen atmosphere at 75℃, add 2.5ml of the azobisisobutyronitrile solution to the entire mixture in step (1) and stir for 1h. Then add the remaining azobisisobutyronitrile solution and stir for 4.5h at 85℃. After cooling to 35℃, add 0.5g of terpene resin and 5ml of toluene to obtain acrylic resin-1. The basic monomers include trimethylolpropane triacrylate, 3,4-dihydroxystyrene and acrylic acid, in a mass ratio of 1.5:1.7:1.

[0028] Preparation Example 4 The preparation method of acrylic resin-2 is the same as that in preparation example 3, except that the amount of functional monomer-1 added is 9g.

[0029] Preparation Example 5 The preparation method of acrylic resin-3 is the same as that of preparation example 3, except that the basic monomers include trimethylolpropane triacrylate, 3,4-dihydroxystyrene and acrylic acid, with a mass ratio of 1.5:2.3:1.

[0030] Preparation Example 6 The preparation method of acrylic resin-4 is the same as that in preparation example 3, except that functional monomer-1 is replaced by functional monomer-2 in equal amounts.

[0031] Preparation Example 7 The preparation method of acrylic resin-5 includes the following steps: (1) Add 10g of acrylate to 7ml of toluene and stir at 65℃ to obtain a mixture; (2) Add 0.1g of azobisisobutyronitrile to 5ml of toluene to obtain an azobisisobutyronitrile solution. Under a nitrogen atmosphere at 75℃, add 2.5ml of the azobisisobutyronitrile solution to the entire mixture in step (1) and stir for 1h. Then add the remaining azobisisobutyronitrile solution and stir for 4.5h at 85℃. After cooling to 35℃, add 0.5g of terpene resin and 5ml of toluene to obtain acrylic resin-5. The acrylates include trimethylolpropane triacrylate, 3,4-dihydroxystyrene and acrylic acid, in a mass ratio of 1.5:1.7:1.

[0032] Preparation Example 8 The preparation method of flame retardant powder-1 includes the following steps: Add 10g magnesium hydroxide and 5g vinyltriethoxysilane to 100ml 80wt% aqueous ethanol solution, stir at 45℃ for 50min, then add 0.1g azobisisobutyronitrile and 4g 4-methacryloyloxybenzophenone, heat to 60℃ and react for 1.5h, filter, wash, and obtain flame retardant powder-1.

[0033] Preparation Example 9 The preparation method of flame retardant powder-2 is the same as that of preparation example 8, except that the amount of 4-methacryloyloxybenzophenone added is 6g.

[0034] Preparation Example 10 The preparation method of flame retardant powder-3 includes the following steps: Add 10g magnesium hydroxide and 5g vinyltriethoxysilane to 100ml 80wt% ethanol aqueous solution, stir at 45℃ for 50min, then add 4g 4-methacryloyloxybenzophenone and heat to 60℃ for 1.5h. Filter to obtain flame retardant powder-3.

[0035] Example 1 A flame-retardant paper tape comprises, from top to bottom, a flame-retardant acrylic pressure-sensitive adhesive layer, a paper layer, a flame-retardant acrylic pressure-sensitive adhesive layer, and a release layer. The flame-retardant acrylic pressure-sensitive adhesive layer is prepared by weight of the following raw materials: 198 parts acrylic resin, 120 parts flame-retardant powder, and 1 part triphenylmethane triisocyanate.

[0036] The preparation method of the cotton paper flame-retardant tape in this embodiment includes the following steps: S1. Acrylic resin-1, flame retardant powder-1 and triphenylmethane triisocyanate are stirred at 25°C for 25 min to obtain a mixture; S2. The mixture obtained in step S1 is uniformly coated onto the upper and lower surfaces of the cotton paper layer under dust-free conditions, with a coating thickness of 23μm. After drying at 90℃, a flame-retardant acrylic pressure-sensitive adhesive layer is obtained. Then, the release layer is unwound onto the flame-retardant acrylic pressure-sensitive adhesive layer on the lower surface of the cotton paper layer and wound up to obtain a flame-retardant cotton paper tape.

[0037] Example 2 A flame-retardant paper tape comprises, from top to bottom, a flame-retardant acrylic pressure-sensitive adhesive layer, a paper layer, a flame-retardant acrylic pressure-sensitive adhesive layer, and a release layer. The flame-retardant acrylic pressure-sensitive adhesive layer is prepared by weight of the following raw materials: 195 parts acrylic resin, 115 parts flame-retardant powder, and 0.5 parts triphenylmethane triisocyanate.

[0038] The preparation method of the cotton paper flame-retardant tape in this embodiment includes the following steps: S1. Acrylic resin-1, flame retardant powder-1 and triphenylmethane triisocyanate are stirred at 20°C for 30 min to obtain a mixture; S2. The mixture obtained in step S1 is uniformly coated onto the upper and lower surfaces of the cotton paper layer under dust-free conditions, with a coating thickness of 20μm. After drying at 85℃, a flame-retardant acrylic pressure-sensitive adhesive layer is obtained. Then, the release layer is unwound onto the flame-retardant acrylic pressure-sensitive adhesive layer on the lower surface of the cotton paper layer and wound up to obtain a flame-retardant cotton paper tape.

[0039] Example 3 A flame-retardant paper tape comprises, from top to bottom, a flame-retardant acrylic pressure-sensitive adhesive layer, a paper layer, a flame-retardant acrylic pressure-sensitive adhesive layer, and a release layer. The flame-retardant acrylic pressure-sensitive adhesive layer is prepared by weight of the following raw materials: 1,100 parts acrylic resin, 1,25 parts flame-retardant powder, and 1.5 parts triphenylmethane triisocyanate.

[0040] The preparation method of the cotton paper flame-retardant tape in this embodiment includes the following steps: S1. Acrylic resin-1, flame retardant powder-1 and triphenylmethane triisocyanate are stirred at 30°C for 20 min to obtain a mixture; S2. The mixture obtained in step S1 is uniformly coated onto the upper and lower surfaces of the cotton paper layer under dust-free conditions, with a coating thickness of 25μm. After drying at 95℃, a flame-retardant acrylic pressure-sensitive adhesive layer is obtained. Then, the release layer is unwound onto the flame-retardant acrylic pressure-sensitive adhesive layer on the lower surface of the cotton paper layer and wound up to obtain a flame-retardant cotton paper tape.

[0041] Example 4 A flame-retardant paper tape and its preparation method are described. The specific implementation method is the same as in Example 1, except that acrylic resin-1 is replaced with an equal amount of acrylic resin-2.

[0042] Example 5 A flame-retardant paper tape and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that acrylic resin-1 is replaced with acrylic resin-3 in equal amounts.

[0043] Example 6 A flame-retardant paper tape and its preparation method are disclosed. The specific implementation method is the same as that in Example 1, except that acrylic resin-1 is replaced with acrylic resin-4 in equal amounts.

[0044] Example 7 A flame-retardant paper tape and its preparation method are disclosed. The specific implementation method is the same as that in Example 1, except that acrylic resin-1 is replaced with acrylic resin-5 in equal amounts.

[0045] Example 8 A flame-retardant paper tape and its preparation method are described. The specific implementation method is the same as in Example 1, except that flame-retardant powder-1 is replaced with flame-retardant powder-2 in equal amounts.

[0046] Example 9 A flame-retardant paper tape and its preparation method are described. The specific implementation method is the same as in Example 1, except that flame-retardant powder-1 is replaced with flame-retardant powder-3 in equal amounts.

[0047] Example 10 A flame-retardant paper tape and its preparation method are described. The specific implementation method is the same as in Example 1, except that flame-retardant powder-1 is replaced with magnesium hydroxide in equal amounts.

[0048] Performance testing 1. Peel strength: The test was conducted in accordance with the ASTM D3330 standard for peel strength testing of pressure-sensitive tapes. The paper tapes obtained in each example were attached to a PC insulating board, pressed with a 2kg roller, and left to stand at room temperature for 20 minutes. A 180° peel test was then performed, and the average force in the peel range was recorded. The test temperature was 23±2℃, the relative humidity was 50%, and the test speed was 300mm / min.

[0049] 2. Flame retardancy: Tested according to UL94 vertical burning test.

[0050] The test results are shown in Table 1.

[0051] Table 1

[0052] A comparison of the data from Examples 1-3 in Table 1 shows that the flame-retardant cotton paper tape has high peel strength, high adhesion, and good flame-retardant effect. A comparison between Example 1 and Example 4 shows that changing the ratio of the base monomer to the functional monomer may lead to the destruction of the cohesion of the pressure-sensitive adhesive layer, molecular chain slippage, decreased peel strength, and reduced adhesion. A comparison between Example 1 and Example 5 shows that changing the ratio of trimethylolpropane triacrylate, 3,4-dihydroxystyrene, and acrylic acid weakens the interaction between the adhesive and the matrix, resulting in lower peel strength. A comparison between Example 1 and Example 6 shows that replacing functional monomer-1 with an equal amount of functional monomer-2 changes the relationship between the compound and the shell. The change in the polysaccharide ratio leads to excessive cross-linking and a decrease in peel strength. A comparison of Examples 1 and 7 shows that without the addition of functional monomers, both the peel strength and flame retardancy of the tape decrease. A comparison of Examples 1 and 8 shows that changing the ratio of magnesium hydroxide to 4-methacryloyloxybenzophenone may result in excessively rigid molecular chains in the pressure-sensitive adhesive, leading to decreased pressure sensitivity and peel strength. A comparison of Examples 1 and 9 shows that directly adding 4-methacryloyloxybenzophenone may result in a decrease in peel strength due to the lack of alkane segments. A comparison of Examples 1 and 10 shows that directly using magnesium hydroxide results in poor dispersibility, leading to a decrease in both the peel strength and flame retardancy of the tape.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A flame-retardant paper tape, characterized in that, From top to bottom, the layers are: flame-retardant acrylic pressure-sensitive adhesive layer, cotton paper layer, flame-retardant acrylic pressure-sensitive adhesive layer, and release layer. The flame-retardant acrylic pressure-sensitive adhesive layer is prepared by weight of the following raw materials: 95-100 parts acrylic resin, 15-25 parts flame retardant powder, and 0.5-1.5 parts curing agent.

2. The flame-retardant paper tape according to claim 1, characterized in that, The method for preparing the acrylic resin includes the following steps: (1) Add the basic monomer and the functional monomer to the solvent and stir at 60-70℃ to obtain a mixture; (2) Add the initiator to the solvent to obtain an initiator solution. Under a nitrogen atmosphere at 70-80℃, add part of the initiator solution to the mixture in step (1) and stir for 0.5-1.5h. Then add the remaining initiator solution and stir for 4-5h at 80-90℃. Then cool to 30-40℃, add tackifying resin and solvent to obtain acrylic resin.

3. The flame-retardant paper tape according to claim 2, characterized in that, The basic monomers include trimethylolpropane triacrylate, 3,4-dihydroxystyrene and acrylic acid, in a mass ratio of (1-2):(1.5-2):

1.

4. The flame-retardant paper tape according to claim 2, characterized in that, The method for preparing the functional monomer includes the following steps: (1) Add pentaerythritol phosphate and acrylic acid to 1,2-dichloroethane, then add a catalyst, react at 55-65℃ for 5-6 h, and then precipitate by column chromatography to obtain the compound; (2) Add the compound obtained in step (1), chitosan, and sodium ethoxide to anhydrous ethanol, react at 55-65℃ for 30-60 min, and then wash, filter, and dry to obtain the functional monomer.

5. The flame-retardant paper tape according to claim 4, characterized in that, The mass ratio of the compound and chitosan in step (2) is 1:(0.1-0.4).

6. The flame-retardant paper tape according to claim 2, characterized in that, The mass ratio of the basic monomer to the functional monomer is 1:(0.5-0.8).

7. The flame-retardant paper tape according to claim 1, characterized in that, The method for preparing the flame retardant powder includes the following steps: Magnesium hydroxide and silane coupling agent are added to ethanol and stirred at 40-50℃ for 30-60 min. Then, an initiator and 4-methacryloyloxybenzophenone are added and the temperature is raised to 55-65℃ for 1-2 h. The mixture is then filtered and washed to obtain flame retardant powder.

8. The flame-retardant adhesive tape for cotton paper according to claim 7, characterized in that, The mass ratio of magnesium hydroxide to 4-methacryloyloxybenzophenone is 1:(0.2-0.5).

9. A method for preparing the flame-retardant adhesive tape made of cotton paper according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Stir acrylic resin, flame retardant powder and curing agent at 20-30℃ for 20-30 minutes to obtain a mixture; S2. The mixture obtained in step S1 is uniformly coated onto the upper and lower surfaces of the cotton paper layer under dust-free conditions, with a coating thickness of 20-25μm. After drying at 85-95℃, a flame-retardant acrylic pressure-sensitive adhesive layer is obtained. Then, the release layer is unwound onto the flame-retardant acrylic pressure-sensitive adhesive layer on the lower surface of the cotton paper layer and wound up to obtain a flame-retardant cotton paper tape.

10. The application of a flame-retardant paper tape according to any one of claims 1-8 or a flame-retardant paper tape obtained by the preparation method according to claim 9, characterized in that, The flame-retardant paper tape is used for bonding and fixing heat insulation cotton, polyurethane foam, PC insulation board, and cushioning foam.

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