A method for preparing a silicone rubber flame-retardant fire extinguishing tape and its application.

Abstract

This invention provides a method for preparing a silicone rubber flame-retardant fire extinguishing tape and its application, relating to the field of flame-retardant fire extinguishing technology. The method includes the following steps: silicone rubber is processed into sheets on a two-roll mill, with the amount of silicone rubber being 90-110 parts and the molecular weight being 400,000-500,000; while keeping the two-roll mill rotating, 100-120 parts of fire extinguishing microcapsules are evenly poured onto the silicone rubber sheets, and the mixture is stirred for 3 minutes to obtain mixed adhesive A. This invention uses silicone rubber with good flexibility and self-melting adhesion as the base material, replacing the gel-like resin in the prior art. Utilizing the inherent properties of silicone rubber, a freely wrappable tape product can be produced without the aid of external adhesive products. It will not break during the wrapping process and can firmly adhere to the surfaces of various equipment, expanding the product's applicable scenarios, especially suitable for areas requiring wrapping protection such as pipelines and circuit interfaces, filling the gap in existing tape-type fire extinguishing and flame-retardant products.

Description

Technical Field

[0001] This invention relates to the field of flame retardant fire extinguishing technology, and in particular to a method for preparing a silicone rubber type flame retardant fire extinguishing tape and its application. Background Technology

[0002] In current fire protection and fire scenario solutions, the participation of firefighters, specialized equipment, and related fire protection facilities is essential for fire prevention and control. The effective implementation of such solutions presupposes the discovery of a fire and the proactive initiation of response procedures. Fires have complex and diverse causes, and their initial stages are characterized by low temperatures, low hazard, and ease of extinguishing. However, some fires are highly concealed in their early stages, making them difficult to detect in time. By the time they are discovered, the fire has already developed to an uncontrollable level. Therefore, achieving rapid detection and effective extinguishing of fires in their initial stages is a crucial issue that urgently needs to be addressed in the fire protection field. Currently, commercially available fire extinguishing patches and tapes are mainly produced by mixing epoxy resin, acrylic resin, polyurethane resin, and other gel-like resins with perfluorohexanone microcapsules, adding an appropriate amount of curing agent, and then coating them. These products can achieve flame-retardant and fire-extinguishing functions to a certain extent and are widely used for the protection of various fire-prone areas.

[0003] Existing commercially available fire extinguishing products and manufacturing processes have the following drawbacks: First, the manufacturing process is cumbersome, with low production efficiency and large space requirements for coating. The coated product needs a semi-curing period before subsequent migration operations can be performed, and the long curing time severely restricts production efficiency. Second, the product lacks toughness; products made with the aforementioned resin have poor toughness after complete curing. If made into tape-type products, they are prone to breakage during wrapping, thus limiting their applicability to sheet-like products. Third, operation and cleaning are inconvenient; the resin has excessive initial viscosity, easily adhering to equipment surfaces, workbenches, and operators during production. Operators must take protective measures and use specialized tools and solvents for removal, increasing production steps and labor costs, and resulting in low cleaning efficiency. Therefore, this invention proposes a method for preparing a silicone rubber-based flame-retardant fire extinguishing tape and its application to solve the problems existing in the prior art. Summary of the Invention

[0004] To address the aforementioned issues, this invention proposes a method for preparing a silicone rubber-based flame-retardant fire extinguishing tape and its application. Silicone rubber, with its excellent flexibility and self-adhesive properties, is selected as the base material to replace the gel-like resins used in existing technologies. Utilizing the inherent properties of silicone rubber, a freely wrappable tape product can be produced without the aid of external adhesives. It does not break during the wrapping process and adheres firmly to the surfaces of various equipment, expanding the product's applicable scenarios. It is particularly suitable for areas requiring wrapping protection, such as pipelines and circuit interfaces, filling a gap in existing flame-retardant fire extinguishing tape products.

[0005] To achieve the objectives of this invention, the following technical solution is provided: a method for preparing a silicone rubber type flame-retardant fire extinguishing tape, comprising the following steps:

[0006] S1: Silicone rubber is processed into sheets on a two-roll mill, wherein the amount of silicone rubber used is 90-110 parts and the molecular weight is 400,000-500,000;

[0007] S2: Keep the open mill running, evenly pour 100-120 parts of fire extinguishing microcapsules into the silicone rubber sheet, and mix for 3 minutes to obtain mixed rubber A;

[0008] S3: Keep the open mill running, and evenly pour 25-30 parts of flame retardant filler, 14%-15% of antimony trioxide by weight of flame retardant filler and 1-2 parts of pigment into mixed rubber A, and mix for 5 minutes to obtain mixed rubber B.

[0009] S4: Cover the two rolls of the calender with two layers of PE film, put the mixed rubber B between the two layers of PE film, and calender to obtain a semi-finished tape. The operating temperature of the open mill and calender is ≤50℃.

[0010] S5: The semi-finished tape is subjected to electron cross-linking treatment with an irradiation intensity of 3.5-4 kGy;

[0011] S6: Peel off the PE film from one side of the semi-finished tape, wrap it around the core, and cut it into the required size to obtain the finished tape.

[0012] A further improvement is that, in S1, the silicone rubber is a viscous liquid at room temperature with only slight viscosity, achieving self-melting adhesion and ensuring that the tape can firmly adhere to the surface of the object being protected after being wrapped.

[0013] A further improvement is that, in S2, the fire extinguishing microcapsules are perfluorohexanone microcapsules with a particle size of <100μm, which prevents them from breaking during mixing and calendering, and allows them to release perfluorohexanone to extinguish the fire in the event of a fire.

[0014] A further improvement is made in S3, where the flame-retardant filler is selected from one or more of the following: decabromodiphenyl ethane, magnesium hydroxide, aluminum hydroxide, melamine, tributyl phosphate, dibromomethane, trichlorobromomethane, dichlorobromomethane, toluene-diphenyl phosphate, tricresyl phosphate, and triphenyl phosphate, which together form a synergistic flame-retardant effect with antimony trioxide, thereby improving the flame-retardant performance of the product.

[0015] A further improvement is that in S2 and S3, the mixing operation is repeated multiple times to ensure that the components are evenly dispersed and to avoid component agglomeration.

[0016] A further improvement is made in S3, where the pigment is selected from one or more of yellow, red, and blue to distinguish finished tapes of different specifications and application scenarios, so as to facilitate identification and selection in actual use.

[0017] A further improvement is that, in S4, the calendering parameters of the calender are matched with the texture of the mixed adhesive B to ensure that the semi-finished tape obtained by calendering has a uniform thickness, a smooth surface, and is free from defects such as bubbles and cracks.

[0018] A further improvement is that, in S5, the electron irradiation crosslinking treatment is used to enhance the structural stability and mechanical properties of the tape, and to prevent the tape from breaking during winding and use.

[0019] A further improvement is that, in S6, the specifications of the core are adjusted according to actual needs, and the size of the finished tape after slitting is adjusted according to different protection scenarios.

[0020] An application of a silicone rubber flame-retardant fire extinguishing tape, which is used in the field of fire prevention and control, fire protection of various electrical equipment, flame-retardant wrapping of pipes and cables, and emergency fire prevention in the fields of construction, chemical industry and aerospace. It is especially suitable for insulation protection of high-temperature electrical equipment. By wrapping the tape to the protective surface, it achieves the dual effects of flame retardancy and fire extinguishing.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention uses silicone rubber with good flexibility and self-adhesive properties as the base material to replace the gel-like resin in the prior art. By utilizing the inherent properties of silicone rubber, a freely wrappable tape product can be produced without the aid of external adhesive products. The tape will not break during the wrapping process and can firmly adhere to the surface of various equipment, expanding the application scenarios of the product. It is especially suitable for areas that require wrapping protection, such as pipelines and circuit interfaces, filling the gap in existing tape-type fire extinguishing and flame retardant products.

[0023] 2. This invention adopts a continuous process of open mixing, mixing, calendering, irradiation crosslinking, and winding and cutting to replace the coating process in the prior art. It eliminates the need to wait for the product to semi-cured and fully cured, which greatly shortens the production cycle. At the same time, the continuous process reduces the space occupation, simplifies the production process, and reduces the investment of manpower and equipment. It solves the problems of low production efficiency and large space occupation in the prior art, and is more suitable for large-scale production.

[0024] 3. The silicone rubber used in this invention has only slight stickiness. Compared with the excessively sticky gel-like resins in the prior art, it will not stick to the equipment surface, work surface and operator during the production process. Operators do not need to take additional protective measures. No special tools or specific solvents are needed for cleaning. Residual materials can be easily removed by hand. This not only reduces the difficulty of operation and protection costs, but also greatly improves cleaning efficiency and further reduces the overall production cost. Attached Figure Description

[0025] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0026] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0027] Example 1

[0028] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0029] Step 1. Adjust the required parameters of the open mill, and grind 100 parts of silicone rubber (molecular weight 400,000 to 500,000) into sheets on the open mill and wrap them around the entire roller, and fill the gap between the two rollers with silicone rubber;

[0030] Step 2. While the open mill is rotating, slowly and evenly pour 100 parts of fire extinguishing microcapsules (perfluorohexanone microcapsules, particle size <100μm) onto the silicone rubber. After multiple mixing operations for 3 minutes, a uniform mixed rubber A is obtained.

[0031] Step 3. While the open mill is rotating, pour 30 parts of flame retardant filler (selected by mixing magnesium hydroxide and triphenyl phosphate in a 1:1 ratio), 15% of the weight of antimony trioxide by the flame retardant filler, and 1 part of red pigment onto the mixed rubber A. After multiple mixing operations for 5 minutes, a uniform mixed rubber B is obtained.

[0032] Step 4. Adjust the calender to the required parameters, cover the gap between the two rollers with two layers of ordinary PE film, put the mixed rubber B between the two layers of film, and let it move with the rollers and PE film to obtain the required semi-finished silicone rubber flame retardant fire extinguishing tape.

[0033] Step 5. Adjust the irradiation intensity of the electron irradiation crosslinking equipment to 3.5 kGy, and spread the tape from Step 4 flat on the conveyor belt for irradiation crosslinking treatment;

[0034] Step 6. Peel off the PE film from any side of the tape from Step 5, wrap it around the corresponding core as needed, and then cut it into different sizes to obtain various specifications of fire extinguishing and flame retardant tape.

[0035] Composition: This embodiment uses the optimal formula and process parameters. The dosage of each component and the equipment parameters are all within the reasonable range disclosed in this invention. The silicone rubber, fire extinguishing microcapsules, flame retardant filler and antimony trioxide work synergistically. Effect: The prepared tape has good flexibility, no cracks when wrapped, excellent fire extinguishing and flame retardant properties, no abnormalities in the production process, and the best comprehensive performance, which can meet the protection needs of most scenarios.

[0036] Example 2

[0037] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0038] The silicone rubber in step 1 was adjusted to 90 parts (molecular weight 400,000 to 500,000), and the other steps remained the same as in Example 1.

[0039] Composition: The amount of silicone rubber is slightly lower than in Example 1, while the other components and process parameters remain unchanged; Effect: The prepared tape has good flexibility, no cracks when wrapped, and meets the standards for fire extinguishing and flame retardant properties. The production process is normal and it can be used in scenarios where there are slight requirements for tape thickness and weight.

[0040] Example 3

[0041] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0042] The silicone rubber in step 1 was adjusted to 80 parts (molecular weight 400,000 to 500,000), and the other steps remained the same as in Example 1.

[0043] Composition: The amount of silicone rubber is lower than the optimal range disclosed in this invention (90-110 parts), while the other components and process parameters remain unchanged; Effect: The prepared tape meets the flame retardant performance standard, but the fire extinguishing performance is unqualified. Cracks appear when it is wrapped. There are no abnormalities in the production process. The reason is that the amount of silicone rubber is insufficient, which cannot effectively support the fire extinguishing microcapsules and flame retardant fillers, resulting in uneven dispersion of fire extinguishing components and reduced toughness.

[0044] Example 4

[0045] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0046] The silicone rubber in step 1 was adjusted to 85 parts (molecular weight 400,000 to 500,000), and the other steps remained the same as in Example 1.

[0047] Composition: The amount of silicone rubber is lower than the optimal range, while the other components and process parameters remain unchanged; Effect: Similar to Example 3, the flame retardant performance of the tape meets the standard, but the fire extinguishing performance is unqualified. Cracks appear during wrapping. There are no abnormalities in the production process. This further verifies that when the amount of silicone rubber is lower than the reasonable range of 80-120 parts, it will affect the fire extinguishing performance and toughness of the product.

[0048] Example 5

[0049] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0050] The silicone rubber in step 1 was adjusted to 110 parts (molecular weight 400,000 to 500,000), and the other steps remained the same as in Example 1.

[0051] Composition: The amount of silicone rubber is at the upper limit of the optimal range, while the other components and process parameters remain unchanged; Effect: The prepared tape has good flexibility, no cracks when wrapped, and meets the standards for fire extinguishing and flame retardant properties. The production process is normal and it can be used in scenarios with high requirements for tape thickness and toughness.

[0052] Example 6

[0053] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0054] The silicone rubber in step 1 was adjusted to 115 parts (molecular weight 400,000 to 500,000), and the other steps remained the same as in Example 1.

[0055] Composition: The amount of silicone rubber is higher than the optimal range, while the other components and process parameters remain unchanged; Effect: The prepared tape has good flexibility, no cracks when wrapped, and meets the flame retardant performance standard, but the fire extinguishing performance is unqualified. There are no abnormalities in the production process. The reason is that the amount of silicone rubber is too large, which dilutes the concentration of the fire extinguishing microcapsules, resulting in a decrease in the fire extinguishing effect.

[0056] Example 7

[0057] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0058] The fire extinguishing microcapsules in step 2 were adjusted to 95 parts (perfluorohexanone microcapsules, particle size <100μm), and the other steps remained the same as in Example 1.

[0059] Composition: The amount of fire extinguishing microcapsules is lower than the optimal range (100-120 parts), while the other components and process parameters remain unchanged; Effect: The prepared tape has good flexibility, no cracks when wrapped, and meets the flame retardant performance standard, but the fire extinguishing performance is unqualified. There are no abnormalities in the production process. The reason is that the amount of fire extinguishing microcapsules is insufficient, and sufficient perfluorohexanone cannot be released to extinguish the fire when it occurs.

[0060] Example 8

[0061] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0062] The fire extinguishing microcapsules in step 2 were adjusted to 110 parts (perfluorohexanone microcapsules, particle size <100μm), and the other steps remained the same as in Example 1.

[0063] Composition: The amount of fire extinguishing microcapsules is within the optimal range, and the other components and process parameters remain unchanged; Effect: The prepared tape has good flexibility, no cracks when wrapped, and both fire extinguishing and flame retardant performance meet the standards. There are no abnormalities in the production process, and the overall performance is close to that of Example 1.

[0064] Example 9

[0065] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0066] The fire extinguishing microcapsules in step 2 were adjusted to 120 parts (perfluorohexanone microcapsules, particle size <100μm), and the other steps remained the same as in Example 1.

[0067] Composition: The amount of fire extinguishing microcapsules is at the upper limit of the optimal range, and the other components and process parameters remain unchanged; Effect: The prepared tape has good flexibility, no cracks when wrapped, and meets the standards for fire extinguishing and flame retardant performance. There are no abnormalities in the production process, and the fire extinguishing speed is slightly faster than that in Example 1.

[0068] Example 10

[0069] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0070] The fire extinguishing microcapsules in step 2 were adjusted to 125 parts (perfluorohexanone microcapsules, particle size <100μm), and the other steps remained the same as in Example 1.

[0071] Composition: The amount of fire extinguishing microcapsules is higher than the optimal range, while the other components and process parameters remain unchanged; Effect: The prepared tape meets the standards for flame retardancy and fire extinguishing performance, but cracks appear during winding. There are no abnormalities in the production process. The reason is that the amount of fire extinguishing microcapsules is too large, which affects the flexibility of silicone rubber and leads to a decrease in tape toughness.

[0072] Example 11

[0073] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0074] The flame-retardant filler in step 3 was adjusted to 25 parts (aluminum hydroxide and melamine were used in a 1:1 ratio), and the other steps were kept the same as in Example 1.

[0075] Composition: The amount of flame retardant filler is within the optimal range (25-30 parts), and the other components and process parameters remain unchanged; Effect: The prepared tape has good flexibility, no cracks when wrapped, and meets the standards for fire extinguishing and flame retardant performance. There are no abnormalities in the production process, and it can be used in scenarios with conventional requirements for flame retardant performance.

[0076] Example 12

[0077] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0078] The flame-retardant filler in step 3 was adjusted to 20 parts (aluminum hydroxide and melamine were used in a 1:1 ratio), and the other steps were kept the same as in Example 1.

[0079] Composition: The amount of flame retardant filler is lower than the optimal range, while the other components and process parameters remain unchanged; Effect: The prepared tape has good flexibility, no cracks when wrapped, and meets the fire extinguishing performance standard, but the flame retardant performance is unqualified. There are no abnormalities in the production process. The reason is that the amount of flame retardant filler is insufficient, which cannot form an effective flame retardant barrier and makes it difficult to prevent the spread of flames.

[0080] Example 13

[0081] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0082] The flame retardant filler in step 3 was adjusted to 22 parts (aluminum hydroxide and melamine were used in a 1:1 ratio), and the other steps were kept the same as in Example 1.

[0083] Composition: The amount of flame retardant filler is lower than the optimal range, while the other components and process parameters remain unchanged; Effect: Similar to Example 12, the tape has good flexibility, no cracks when wrapped, fire extinguishing performance meets the standard, flame retardant performance is unqualified, and there are no abnormalities in the production process. This further verifies that when the amount of flame retardant filler is lower than the reasonable range of 20-35 parts, it will affect the flame retardant performance of the product.

[0084] Example 14

[0085] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0086] The flame retardant filler in step 3 was adjusted to 24 parts (aluminum hydroxide and melamine were used in a 1:1 ratio), and the other steps were kept the same as in Example 1.

[0087] Composition: The amount of flame retardant filler is lower than the optimal range, while the other components and process parameters remain unchanged; Effect: Consistent with Examples 12 and 13, the tape has good flexibility, no cracks when wrapped, fire extinguishing performance meets the standard, flame retardant performance is unqualified, and there are no abnormalities in the production process.

[0088] Example 15

[0089] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0090] The flame retardant filler in step 3 was adjusted to 35 parts (aluminum hydroxide and melamine were used in a 1:1 ratio), and the other steps were kept the same as in Example 1.

[0091] Composition: The amount of flame retardant filler is higher than the optimal range, while the other components and process parameters remain unchanged; Effect: The prepared tape meets the standards for fire extinguishing and flame retardant performance, but cracks appear when it is wrapped. There are no abnormalities in the production process. The reason is that the amount of flame retardant filler is too large, which reduces the flexibility of silicone rubber and causes the tape to become tougher.

[0092] Example 16

[0093] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0094] In step 3, the ratio of antimony trioxide was adjusted to 14% of the flame-retardant filler, while the other steps remained the same as in Example 1.

[0095] Composition: The amount of antimony trioxide is within a reasonable range (14%-15%), and the other components and process parameters remain unchanged; Effect: The prepared tape has good flexibility, no cracks when wrapped, and meets the standards for fire extinguishing and flame retardant performance. There are no abnormalities in the production process. The flame retardant effect is slightly lower than that in Example 1, which verifies that the amount of antimony trioxide in the range of 14%-15% can achieve effective flame retardancy.

[0096] Example 17

[0097] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0098] The irradiation intensity in step 5 was adjusted to 4 kGy, while the other steps remained the same as in Example 1.

[0099] Composition: The irradiation intensity is within the optimal range (3.5-4 kGy), and the other components and process parameters remain unchanged; Effect: The prepared tape has good flexibility, no cracks when wrapped, and meets the standards for fire extinguishing and flame retardant performance. There are no abnormalities in the production process, and the structural stability of the tape is slightly higher than that of Example 1.

[0100] Example 18

[0101] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0102] The irradiation intensity in step 5 was adjusted to 4.5 kGy, while the other steps remained the same as in Example 1.

[0103] Composition: The irradiation intensity is higher than the optimal range, while the other components and process parameters remain unchanged; Effect: The prepared tape has good flexibility, no cracks when wrapped, and meets the flame retardant performance standard, but the fire extinguishing performance is unqualified. There are no abnormalities in the production process. The reason is that the irradiation intensity is too high, which causes the fire extinguishing microcapsules to partially rupture and perfluorohexanone to leak prematurely, affecting the fire extinguishing effect.

[0104] Example 19

[0105] according to Figure 1 As shown in the figure, this embodiment proposes a method for preparing silicone rubber type flame-retardant fire extinguishing tape and its application, including the following steps:

[0106] The irradiation intensity in step 5 was adjusted to 3 kGy, while the other steps remained the same as in Example 1.

[0107] Composition: Irradiation intensity is below the optimal range, while other components and process parameters remain unchanged; Effect: The prepared tape exhibits good flexibility, exhibits no cracks during winding, and meets flame retardant performance standards, but its fire extinguishing performance is substandard. The production process was normal, but the reason is insufficient irradiation intensity and inadequate tape structural stability, preventing the timely release of perfluorohexanone from the fire extinguishing microcapsules in the event of a fire.

[0108] Comparative Example 1:

[0109] The selected silicone rubber has a molecular weight of less than 400,000, and the other steps are consistent with those in Example 1.

[0110] Composition: The molecular weight of the silicone rubber exceeds the range of 400,000 to 500,000 defined in this invention. The remaining components and process parameters are the same as in Example 1. Effect: The prepared tape meets the flame retardant performance standard, but the fire extinguishing performance is unqualified. There are no cracks when it is wrapped and there are no abnormalities in the production process. The reason is that the molecular weight of the silicone rubber is too low, and it cannot form a stable polymer structure. It is difficult to effectively encapsulate the fire extinguishing microcapsules, which makes it impossible for the fire extinguishing microcapsules to effectively release perfluorohexanone during a fire.

[0111] Comparative Example 2:

[0112] The selected silicone rubber has a molecular weight greater than 500,000, and the other steps are consistent with those in Example 1.

[0113] Composition: The molecular weight of the silicone rubber exceeds the range defined in this invention, while the remaining components and process parameters are consistent with those in Example 1; Effect: The prepared tape meets the flame retardant performance standard, but the fire extinguishing performance is unqualified. There are no cracks when it is wrapped and there are no abnormalities in the production process. The reason is that the molecular weight of the silicone rubber is too high and the texture is too thick. During the mixing process, it cannot be evenly mixed with the fire extinguishing microcapsules and flame retardant fillers, resulting in uneven dispersion of the fire extinguishing components and failure to achieve effective fire extinguishing.

[0114] Comparative Example 3:

[0115] The selected fire extinguishing microcapsules had a particle size >100μm, and the other steps were consistent with those in Example 1.

[0116] Composition: The particle size of the fire extinguishing microcapsules exceeds the <100μm range specified in this invention. The remaining components and process parameters are the same as in Example 1. Effect: The prepared tape meets the flame retardant performance standard, but the fire extinguishing performance is unqualified. There are no cracks when it is wrapped. Liquid can be seen on the open mill during production. It is tested to be perfluorohexanone. The reason is that the particle size of the fire extinguishing microcapsules is too large. They are prone to breakage during the open mill mixing process, which leads to premature leakage of perfluorohexanone and makes it unable to play a fire extinguishing role in the event of a fire.

[0117] Comparative Example 4:

[0118] In steps 1, 2, and 3, the temperature of the open mill roll is >50°C, and the other steps are consistent with those in Example 1.

[0119] Composition: The operating temperature of the open mill exceeds the requirement of not exceeding 50°C as specified in this invention. The remaining components and process parameters are the same as in Example 1. Effect: The flame retardant performance of the prepared tape meets the standard, but the fire extinguishing performance is unqualified. There are no cracks when winding. Liquid can be seen on the open mill during production. After testing, it is found to be perfluorohexanone. The reason is that the temperature of the open mill roll is too high, which causes the fire extinguishing microcapsules to rupture due to heat. The perfluorohexanone leaks prematurely and loses its fire extinguishing effect.

[0120] Comparative Example 5:

[0121] In step 4, the temperature of the calendering roll is >50°C, and the other steps are consistent with those in Example 1.

[0122] Composition: The operating temperature of the calender exceeds the requirements of this invention, while the remaining components and process parameters are the same as in Example 1; Effect: The prepared tape meets the flame retardant performance standard, but the fire extinguishing performance is unqualified. There are no cracks when winding, but liquid can be seen on the calender during production. After testing, it is found to be perfluorohexanone. The reason is that the temperature of the calender roll is too high, which causes the fire extinguishing microcapsules to rupture due to heat, and the perfluorohexanone leaks prematurely, thus failing to achieve the fire extinguishing function.

[0123] Performance test results:

[0124] The product test results for each embodiment and comparative example are shown in the table below. The test items include whether the fire is extinguished, whether it is flame retardant, whether there are cracks during winding, and phenomena during production. The test conditions are uniform to ensure the accuracy and comparability of the test results:

[0125] Example 1 yes yes no No abnormalities Example 2 yes yes no No abnormalities Example 3 no yes yes No abnormalities Example 4 no yes yes No abnormalities Example 5 yes yes no No abnormalities Example 6 no yes no No abnormalities Example 7 no yes no No abnormalities Example 8 yes yes no No abnormalities Example 9 yes yes no No abnormalities Example 10 yes yes yes No abnormalities Example 11 yes yes no No abnormalities Example 12 yes no no No abnormalities Example 13 yes no no No abnormalities Example 14 yes no no No abnormalities Example 15 yes yes yes No abnormalities Example 16 yes yes no No abnormalities Example 17 yes yes no No abnormalities Example 18 no yes no No abnormalities Example 19 no yes no No abnormalities Comparative Example 1 no yes no No abnormalities Comparative Example 2 no yes no No abnormalities Comparative Example 3 no yes no The liquid observed on the open mill was identified as perfluorohexanone. Comparative Example 4 no yes no The liquid observed on the open mill was identified as perfluorohexanone. Comparative Example 5 no yes no A liquid was observed on the calendering machine, which was identified as perfluorohexanone.

[0126] Test results show that only when the dosage of each component and the equipment parameters are within the reasonable range defined by this invention can the prepared silicone rubber flame-retardant fire extinguishing tape simultaneously meet the requirements of fire extinguishing, flame retardancy, and being able to be wrapped without cracks, and the production process is normal. Once the limit is exceeded, the product performance will be unqualified, which further verifies the rationality of this invention.

[0127] This invention uses silicone rubber, which has good flexibility and self-adhesive properties, as the base material to replace the gel-like resin in existing technologies. Utilizing the inherent properties of silicone rubber, a freely wrappable tape product can be produced without the need for external adhesives. It does not break during the wrapping process and adheres firmly to the surfaces of various equipment, expanding the product's application scenarios. It is particularly suitable for areas requiring wrapping protection, such as pipelines and circuit interfaces, filling the gap in existing tape-type fire extinguishing and flame retardant products. This invention employs a continuous process of open mixing, compounding, calendering, irradiation crosslinking, and wrapping and cutting, replacing the coating process in existing technologies. This eliminates the need to wait for the product to partially or fully cure, significantly shortening the production cycle. Simultaneously, the continuous process reduces space requirements, simplifies the production process, and lowers labor and equipment investment, solving the problems of low production efficiency and large space requirements in existing technologies, making it more suitable for large-scale production. The silicone rubber used in this invention has only slight tackiness. Compared with the excessively sticky gel-like resins in the prior art, it will not stick to the equipment surface, work surface and operator's body during the production process. Operators do not need to take additional protective measures. No special tools or specific solvents are needed for cleaning. Residual materials can be easily removed by hand. This not only reduces the difficulty of operation and protection costs, but also greatly improves cleaning efficiency and further reduces the overall production cost.

[0128] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a silicone rubber type flame-retardant fire extinguishing tape, characterized in that, Includes the following steps: S1: Silicone rubber is processed into sheets on a two-roll mill, wherein the amount of silicone rubber used is 90-110 parts and the molecular weight is 400,000-500,000; S2: Keep the open mill running, evenly pour 100-120 parts of fire extinguishing microcapsules into the silicone rubber sheet, and mix for 3 minutes to obtain mixed rubber A; S3: Keep the open mill running, and evenly pour 25-30 parts of flame retardant filler, 14%-15% of antimony trioxide by weight of flame retardant filler and 1-2 parts of pigment into mixed rubber A, and mix for 5 minutes to obtain mixed rubber B. S4: Cover the two rolls of the calender with two layers of PE film, put the mixed rubber B between the two layers of PE film, and calender to obtain a semi-finished tape. The operating temperature of the open mill and calender is ≤50℃. S5: The semi-finished tape is subjected to electron cross-linking treatment with an irradiation intensity of 3.5-4 kGy; S6: Peel off the PE film from one side of the semi-finished tape, wrap it around the core, and cut it into the required size to obtain the finished tape.

2. The method for preparing a silicone rubber type flame-retardant fire extinguishing tape according to claim 1, characterized in that: In S1, the silicone rubber is a viscous liquid at room temperature with only slight viscosity, achieving self-melting adhesion and ensuring that the tape can firmly adhere to the surface of the object being protected after being wrapped.

3. The method for preparing a silicone rubber type flame-retardant fire extinguishing tape according to claim 1, characterized in that: In S2, the fire extinguishing microcapsules are perfluorohexanone microcapsules with a particle size of <100μm, which prevents them from breaking during mixing and calendering. When a fire occurs, they can release perfluorohexanone to extinguish the fire.

4. The method for preparing a silicone rubber type flame-retardant fire extinguishing tape according to claim 1, characterized in that: In S3, the flame-retardant filler is selected from one or more of the following: decabromodiphenyl ethane, magnesium hydroxide, aluminum hydroxide, melamine, tributyl phosphate, dibromomethane, trichlorobromomethane, dichlorobromomethane, toluene-diphenyl phosphate, tricresyl phosphate, and triphenyl phosphate, which form a synergistic flame-retardant effect with antimony trioxide and improve the flame-retardant performance of the product.

5. The method for preparing a silicone rubber type flame-retardant fire extinguishing tape according to claim 1, characterized in that: In S2 and S3, the mixing operation is repeated multiple times to ensure that the components are evenly dispersed and to avoid component agglomeration.

6. The method for preparing a silicone rubber type flame-retardant fire extinguishing tape according to claim 1, characterized in that: In step S3, the pigment is selected from one or more of yellow, red, and blue to distinguish finished tapes of different specifications and application scenarios, so as to identify and select them in actual use.

7. The method for preparing a silicone rubber type flame-retardant fire extinguishing tape according to claim 1, characterized in that: In step S4, the calendering parameters of the calender are matched with the texture of the mixed adhesive B to ensure that the semi-finished tape obtained by calendering has uniform thickness, a smooth surface, and is free from defects such as bubbles and cracks.

8. The method for preparing a silicone rubber type flame-retardant fire extinguishing tape according to claim 1, characterized in that: In step S5, electron irradiation crosslinking treatment is used to improve the structural stability and mechanical properties of the tape, and to prevent the tape from being damaged during winding and use.

9. The method for preparing a silicone rubber type flame-retardant fire extinguishing tape according to claim 1, characterized in that: In S6, the specifications of the core are adjusted according to actual needs, and the size of the finished tape after slitting is adjusted according to different protection scenarios.

10. The application of a silicone rubber flame-retardant fire extinguishing tape prepared by the method described in any one of claims 1-9, characterized in that, The aforementioned silicone rubber flame-retardant fire extinguishing tape is used in the field of fire prevention and control, fire protection of various electrical equipment, flame-retardant wrapping of pipes and cables, and emergency fire prevention in the fields of construction, chemical industry, and aerospace. It is especially suitable for insulation protection of high-temperature electrical equipment. By wrapping the tape to adhere to the protective surface, it achieves both flame-retardant and fire-extinguishing effects.

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