A flame retardant and fire resistant silicone tape and preparation method thereof

Abstract

The present invention relates to the technical field of silicone tapes, and in particular to a flame retardant and fire-resistant silicone tape and a preparation method thereof. The biochar in the modified biomass carbon powder used can not only be used as a filler for silicone, but also as a carrier for an inorganic flame retardant, so that the magnesium hydroxide partially enters the porous structure of the biochar, which can greatly reduce the effect of the inorganic flame retardant directly added to the silicone on the mechanical properties of the material. The addition of γ-aminopropyltriethoxysilane increases the compatibility of the modified biomass carbon powder with the silicone system, and also reduces the agglomeration of magnesium hydroxide and expanded graphene in the silicone system, further enhancing the mechanical properties of the silicone. The addition of expanded graphene can further enhance the flame retardant effect. In summary, the biochar, magnesium hydroxide and expanded graphene in the modified biomass carbon powder in the flame retardant and fire-resistant silicone tape of the present invention cooperate with each other, which can greatly improve the flame retardant properties and ensure the mechanical properties of the silicone tape.

Description

Technical Field

[0001] The invention relates to the technical field of silicone tapes, and in particular to a flame retardant and fire resistant silicone tape and a preparation method thereof. Background Art

[0002] Silicone tape is mainly used as an insulating material. For example, it is directly wrapped around the outside of the wire during production, or after electricians inspect and repair the wires, they use silicone tape to wrap around the interface.

[0003] With the continuous development of society, in the field of industrial production, users of silicone tapes have higher and higher requirements for the quality of silicone tapes, especially for flame retardant properties. Fire-resistant cables wrapped with silicone tapes are prone to become brittle and fall off after a fire, which greatly reduces the fire-resistant effect and causes a short circuit in the line, making it difficult to ensure the safety and smooth flow of electricity and communications in the event of a fire.

[0004] In the prior art, various flame retardants are usually added directly to silicone rubber. However, the direct addition of flame retardants often reduces the mechanical properties of the silicone rubber belt. Summary of the invention

[0005] In view of the above technical problems, the object of the present invention is to provide a flame retardant and fire-resistant silicone belt with good flame retardant effect and excellent mechanical properties.

[0006] To achieve the purpose of the present invention, the present invention adopts the following technical solution:

[0007] A flame retardant and fire resistant silicone tape, which is composed of the following raw materials in parts by weight: 100-120 parts of methyl vinyl silicone rubber, 60-70 parts of fumed silica, 3-7 parts of terminal hydroxyl polydimethylsiloxane, 0.5-1 part of dioctyl acid phosphate, 2-6 parts of vinyl hydroxy silicone oil, 10-15 parts of modified biomass carbon powder, 0.2-0.4 parts of zinc stearate and 5.5-6.5 parts of a vulcanizing agent.

[0008] In particular, the dioctyl acid phosphate used in the present invention can satisfy both flame retardancy and compatibility.

[0009] The methyl vinyl silicone rubber of the present invention is methyl vinyl silicone rubber 110-2 purchased from China National Bluestar (Group) Co., Ltd.

[0010] Wherein, the modified biomass carbon powder is prepared by the following preparation method:

[0011] Step A, soaking 100-200g of biochar in 1000ml of magnesium hydroxide impregnation solution prepared by mixing ammonia water and magnesium chloride solution for 30-60min, so that more magnesium hydroxide can enter the internal pores of the biochar;

[0012] Step B, then add 20-50gγ-aminopropyltriethoxysilane ultrasonic vibration 60-120min, separate, 20-40 ℃ drying;

[0013] Step C: Mix the dried biomass carbon and expanded graphite in a weight ratio of (10-15):1, and perform ultrasonic vibration for 30-60 minutes to obtain modified biomass carbon powder.

[0014] The biomass charcoal used in the present invention is graphitized biomass charcoal obtained by pyrolyzing bamboo under nitrogen protection conditions at a pyrolysis temperature of 1300°C, a heating rate of 280°C / h, and a pyrolysis time of 2 h. This kind of biomass charcoal not only retains the original porous structure characteristics; but also the graphitized biomass charcoal can effectively enhance the stiffness and hardness of the composite material.

[0015] Among them, the expanded graphite uses expandable graphene produced by Qingdao Baixing Graphite Co., Ltd.

[0016] Wherein, the concentration of the magnesium chloride solution in step A is 1-1.5 mol / L; the concentration of the ammonia water is about 26 wt%; and the volume ratio of the magnesium chloride solution to the ammonia water is 100:(1-10).

[0017] The addition of γ-aminopropyltriethoxysilane increases the compatibility of modified biomass carbon powder with the silica gel system, and also reduces the agglomeration of magnesium hydroxide and expanded graphene in the silica gel system.

[0018] Wherein, the particle size of the biochar is 10-100 mesh, and the particle size of the expanded graphite is 200 mesh-300 mesh. Due to the small particle size of the expanded graphite, a small part can still partially enter the pores of the biochar, and the remaining part enters the silica gel system to play a role. Most of the magnesium hydroxide enters the pores of the biochar, and the remaining part enters the silica gel system to play a role. When encountering a fire, the first to play a role are the magnesium hydroxide and expanded graphite that enter the silica gel system. As time goes by and the temperature rises further, the expanded graphite that enters the pores of the biochar expands, causing the biochar pores to partially rupture, releasing the internal magnesium hydroxide, further extending the flame retardant time, and further improving the flame retardant effect.

[0019] The flame retardant and fire-resistant silicone tape of the present invention adopts modified biomass carbon powder, which not only has good flame retardant effect but also has low cost. Compared with the previous ceramic silicone tape product of the applicant, the cost is reduced by about 30%.

[0020] The fumed silica has a particle size of 25-35 nm and a specific surface area of ​​230 m 2 / g of fumed silica.

[0021] Wherein, the vulcanizing agent is a platinum vulcanizing agent, and BPX-800 produced by Xiamen Baipoxin Industry and Trade Co., Ltd. is used.

[0022] A method for preparing the flame retardant and fire resistant silicone tape comprises the following steps:

[0023] Step 1: firstly, methyl vinyl silicone rubber and fumed silica are firstly mixed, then terminal hydroxyl polydimethylsiloxane, dioctyl acid phosphate, vinyl hydroxy silicone oil, modified biomass carbon powder and zinc stearate are added to continue the second mixing, and finally, a vulcanizing agent is added to carry out the third mixing to obtain silicone rubber;

[0024] Step 2: Pressing the silicone rubber into sheets to obtain a molded silicone sheet;

[0025] Step 3: Apply glue on the silicone sheet, press the silicone sheet onto the glass fiber cloth, cut and package it to obtain the flame-retardant and fire-resistant silicone tape.

[0026] Among them, the first mixing temperature is 125-135°C, the mixing time is 1-3h, the second mixing temperature is 130-140°C, the mixing time is 1-3h, the third mixing temperature is 30-45°C, and the mixing time is 15-30min; the pressing temperature in the tableting process is 150-170°C, the pressing pressure is 8-12MPa, and the pressing time is 1-5h.

[0027] Compared with the prior art, the flame retardant and fire-resistant silicone tape designed by the present invention has the following advantages: the flame retardant and fire-resistant silicone tape of the present invention, the biochar in the modified biomass carbon powder used can not only be used as a filler for silica gel, but also can be used as a carrier of inorganic flame retardant, so that the magnesium hydroxide part enters into the porous structure of the biochar, which can greatly reduce the effect of the inorganic flame retardant directly added to the silica gel on the mechanical properties of the material, the addition of γ-aminopropyltriethoxysilane increases the compatibility of the modified biomass carbon powder with the silica gel system, and also reduces the agglomeration of magnesium hydroxide and expanded graphene in the silica gel system, further enhancing the mechanical properties of silica gel, and the addition of expanded graphene can further enhance the flame retardant effect. In summary, the biochar, magnesium hydroxide and expanded graphene in the modified biomass carbon powder cooperate with each other, which can not only greatly improve the flame retardant properties of silica gel, but also ensure the mechanical properties of silica gel, and the cost is low. Implementation

[0028] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments. Example 1

[0029] A flame retardant and fire-resistant silicone tape, which is composed of the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 60 parts of fumed silica, 3 parts of terminal hydroxyl polydimethylsiloxane, 0.5 parts of dioctyl acid phosphate, 2 parts of vinyl hydroxy silicone oil, 10 parts of modified biomass carbon powder, 0.2 parts of zinc stearate and 5.5 parts of vulcanizing agent.

[0030] Wherein, the modified biomass carbon powder is prepared by the following preparation method:

[0031] Step A, soaking 100g of biochar in 1000ml of magnesium hydroxide impregnation solution prepared by mixing ammonia water and magnesium chloride solution for 30min;

[0032] Step B, then add 20gγ-aminopropyltriethoxysilane ultrasonic vibration 60min, separate, and dry at 20 ℃;

[0033] Step C: Mix the dried biomass carbon and expanded graphite in a weight ratio of 10:1, and perform ultrasonic vibration for 30 minutes to obtain modified biomass carbon powder.

[0034] The biomass charcoal used in the present invention is graphitized biomass charcoal obtained by pyrolyzing bamboo under nitrogen protection conditions, with a pyrolysis temperature of 1300°C, a heating rate of 280°C / h, and a pyrolysis time of 2 h.

[0035] Wherein, the concentration of the magnesium chloride solution in step A is 1 mol / L; the concentration of the ammonia water is about 26 wt%; and the volume ratio of the magnesium chloride solution to the ammonia water is 100:1.

[0036] Wherein, the particle size of the biomass carbon powder is 10 meshes, and the particle size of the expanded graphite is 200 meshes.

[0037] The fumed silica has a particle size of 25 nm and a specific surface area of ​​230 m 2 / g of fumed silica.

[0038] Wherein, the vulcanizing agent is a platinum vulcanizing agent.

[0039] A method for preparing the flame retardant and fire resistant silicone tape comprises the following steps:

[0040] Step 1: firstly, methyl vinyl silicone rubber and fumed silica are firstly mixed, then terminal hydroxyl polydimethylsiloxane, dioctyl acid phosphate, vinyl hydroxy silicone oil, modified biomass carbon powder and zinc stearate are added to continue the second mixing, and finally, a vulcanizing agent is added to carry out the third mixing to obtain silicone rubber;

[0041] Step 2: Pressing the silicone rubber into sheets to obtain a molded silicone sheet;

[0042] Step 3: Apply glue on the silicone sheet, press the silicone sheet onto the glass fiber cloth, cut and package it to obtain the flame-retardant and fire-resistant silicone tape.

[0043] Among them, the first mixing temperature is 125°C, the mixing time is 3h, the second mixing temperature is 130°C, the mixing time is 3h, the third mixing temperature is 30°C, and the mixing time is 30min; the pressing temperature in the tableting process is 150°C, the pressing pressure is 12MPa, and the pressing time is 5h. Example 2

[0044] A flame retardant and fire resistant silicone tape, which is composed of the following raw materials in parts by weight: 110 parts of methyl vinyl silicone rubber, 65 parts of fumed silica, 5 parts of terminal hydroxyl polydimethylsiloxane, 0.8 parts of dioctyl acid phosphate, 4 parts of vinyl hydroxy silicone oil, 12 parts of modified biomass carbon powder, 0.3 parts of zinc stearate and 6.0 parts of vulcanizing agent.

[0045] Wherein, the modified biomass carbon powder is prepared by the following preparation method:

[0046] Step A, soaking 150g of biochar in 1000ml of magnesium hydroxide impregnation solution prepared by mixing ammonia water and magnesium chloride solution for 45min;

[0047] Step B, then add 35gγ-aminopropyltriethoxysilane ultrasonic vibration 100min, separate, and dry at 30 ℃;

[0048] Step C: Mix the dried biomass carbon and expanded graphite in a weight ratio of 12:1, and perform ultrasonic vibration for 40 minutes to obtain modified biomass carbon powder.

[0049] The biomass charcoal used in the present invention is graphitized biomass charcoal obtained by pyrolyzing bamboo under nitrogen protection conditions, with a pyrolysis temperature of 1300°C, a heating rate of 280°C / h, and a pyrolysis time of 2 h.

[0050] Wherein, the concentration of the magnesium chloride solution in step A is 1.3 mol / L; the concentration of the ammonia water is about 26 wt%; and the volume ratio of the magnesium chloride solution to the ammonia water is 100:5.

[0051] Wherein, the particle size of the biomass carbon is 50 meshes, and the particle size of the expanded graphite is 250 meshes.

[0052] The fumed silica has a particle size of 30 nm and a specific surface area of ​​230 m 2 / g of fumed silica.

[0053] Wherein, the vulcanizing agent is a platinum vulcanizing agent.

[0054] A method for preparing the flame retardant and fire resistant silicone tape comprises the following steps:

[0055] Step 1: firstly, methyl vinyl silicone rubber and fumed silica are firstly mixed, then terminal hydroxyl polydimethylsiloxane, dioctyl acid phosphate, vinyl hydroxy silicone oil, modified biomass carbon powder and zinc stearate are added to continue the second mixing, and finally, a vulcanizing agent is added to carry out the third mixing to obtain silicone rubber;

[0056] Step 2: Pressing the silicone rubber into sheets to obtain a molded silicone sheet;

[0057] Step 3: Apply glue on the silicone sheet, press the silicone sheet onto the glass fiber cloth, cut and package it to obtain the flame-retardant and fire-resistant silicone tape.

[0058] Among them, the first mixing temperature is 130°C, the mixing time is 2h, the second mixing temperature is 135°C, the mixing time is 2h, the third mixing temperature is 40°C, and the mixing time is 20min; the pressing temperature in the tableting process is 160°C, the pressing pressure is 10MPa, and the pressing time is 3h. Example 3

[0059] A flame retardant and fire resistant silicone tape, which is composed of the following raw materials in parts by weight: 120 parts of methyl vinyl silicone rubber, 70 parts of fumed silica, 7 parts of terminal hydroxyl polydimethylsiloxane, 1 part of dioctyl acid phosphate, 6 parts of vinyl hydroxy silicone oil, 15 parts of modified biomass carbon powder, 0.4 parts of zinc stearate and 6.5 parts of vulcanizing agent.

[0060] Wherein, the modified biomass carbon powder is prepared by the following preparation method:

[0061] Step A, soaking 200g of biochar in 1000ml of magnesium hydroxide impregnation solution prepared by mixing ammonia water and magnesium chloride solution for 60min;

[0062] Step B, then add 50gγ-aminopropyltriethoxysilane ultrasonic vibration 120min, separate, and dry at 40 ℃;

[0063] Step C: Mix the dried biomass carbon and expanded graphite in a weight ratio of 15:1, and perform ultrasonic vibration for 60 minutes to obtain modified biomass carbon powder.

[0064] Wherein, the concentration of the magnesium chloride solution in step A is 1.5 mol / L; the concentration of the ammonia water is about 26 wt%; and the volume ratio of the magnesium chloride solution to the ammonia water is 100:10.

[0065] Wherein, the particle size of the biomass carbon is 100 mesh, and the particle size of the expanded graphite is 300 mesh.

[0066] The biomass charcoal used in the present invention is graphitized biomass charcoal obtained by pyrolyzing bamboo under nitrogen protection conditions, with a pyrolysis temperature of 1300°C, a heating rate of 280°C / h, and a pyrolysis time of 2 h.

[0067] The fumed silica has a particle size of 35 nm and a specific surface area of ​​230 m 2 / g of fumed silica.

[0068] Wherein, the vulcanizing agent is a platinum vulcanizing agent.

[0069] A method for preparing the flame retardant and fire resistant silicone tape comprises the following steps:

[0070] Step 1: firstly, methyl vinyl silicone rubber and fumed silica are firstly mixed, then terminal hydroxyl polydimethylsiloxane, dioctyl acid phosphate, vinyl hydroxy silicone oil, modified biomass carbon powder and zinc stearate are added to continue the second mixing, and finally, a vulcanizing agent is added to carry out the third mixing to obtain silicone rubber;

[0071] Step 2: Pressing the silicone rubber into sheets to obtain a molded silicone sheet;

[0072] Step 3: Apply glue on the silicone sheet, press the silicone sheet onto the glass fiber cloth, cut and package it to obtain the flame-retardant and fire-resistant silicone tape.

[0073] Among them, the first mixing temperature is 135°C, the mixing time is 1h, the second mixing temperature is 140°C, the mixing time is 1h, the third mixing temperature is 45°C, and the mixing time is 15min; the pressing temperature in the tableting process is 170°C, the pressing pressure is 8MPa, and the pressing time is 1h. Comparative Example 1

[0074] The difference between this comparative example 1 and example 2 is that:

[0075] A flame retardant and fire resistant silicone tape, which is composed of the following raw materials in parts by weight: 110 parts of methyl vinyl silicone rubber, 65 parts of fumed silica, 5 parts of terminal hydroxyl polydimethylsiloxane, 0.8 parts of dioctyl acid phosphate, 4 parts of vinyl hydroxy silicone oil, 12 parts of magnesium hydroxide, 12 parts of modified biomass carbon powder, 0.3 parts of zinc stearate and 6.0 parts of vulcanizing agent.

[0076] Wherein, the modified biomass carbon powder is prepared by the following preparation method:

[0077] Step A, 150g of biochar was soaked in 1000ml of an aqueous solution containing 35g of γ-aminopropyltriethoxysilane and subjected to ultrasonic vibration for 100min, separated, and dried at 30°C;

[0078] Step B: Mix the dried biochar and expanded graphite in a weight ratio of 12:1, and perform ultrasonic vibration for 40 minutes to obtain modified biochar powder.

[0079] Wherein, the particle size of the biomass carbon is 50 meshes, and the particle size of the expanded graphite is 250 meshes.

[0080] The fumed silica has a particle size of 30 nm and a specific surface area of ​​230 m 2 / g of fumed silica.

[0081] Wherein, the vulcanizing agent is a platinum vulcanizing agent.

[0082] A method for preparing the flame retardant and fire resistant silicone tape comprises the following steps:

[0083] Step 1: firstly, methyl vinyl silicone rubber and fumed silica are firstly mixed, then terminal hydroxyl polydimethylsiloxane, dioctyl acid phosphate, vinyl hydroxy silicone oil, modified biomass carbon powder, magnesium hydroxide and zinc stearate are added to continue the second mixing, and finally, a vulcanizing agent is added to carry out the third mixing to obtain silicone rubber;

[0084] Step 2: Pressing the silicone rubber into sheets to obtain a molded silicone sheet;

[0085] Step 3: Apply glue on the silicone sheet, press the silicone sheet onto the glass fiber cloth, cut and package it to obtain the flame-retardant and fire-resistant silicone tape.

[0086] Among them, the first mixing temperature is 130°C, the mixing time is 2h, the second mixing temperature is 135°C, the mixing time is 2h, the third mixing temperature is 40°C, and the mixing time is 20min; the pressing temperature in the tableting process is 160°C, the pressing pressure is 10MPa, and the pressing time is 3h. Comparative Example 2

[0087] The difference between this comparative example 2 and example 2 is that the modified biomass carbon powder is prepared by the following preparation method:

[0088] Step A, soaking 150g of biochar in 1000ml of magnesium hydroxide impregnation solution prepared by mixing ammonia water and magnesium chloride solution for 45min;

[0089] Step B, then separated and dried at 30 ° C;

[0090] Step C: Mix the dried biomass carbon and expanded graphite in a weight ratio of 12:1, and perform ultrasonic vibration for 40 minutes to obtain modified biomass carbon powder.

[0091] Wherein, the concentration of the magnesium chloride solution in step A is 1.3 mol / L; the concentration of the ammonia water is about 26 wt%; and the volume ratio of the magnesium chloride solution to the ammonia water is 100:5. Comparative Example 3

[0092] The difference between this comparative example 3 and example 2 is that the modified biomass carbon powder is prepared by the following preparation method:

[0093] Step A, soaking 150g of biomass carbon powder in 1000ml of magnesium hydroxide impregnation solution prepared by mixing ammonia water and magnesium chloride solution for 45min;

[0094] Step B: then add 35 g of γ-aminopropyltriethoxysilane and vibrate ultrasonically for 100 min, separate, and dry at 30° C. to obtain modified biomass carbon powder.

[0095] Wherein, the concentration of the magnesium chloride solution in step A is 1.3 mol / L; the concentration of the ammonia water is about 26 wt%; and the volume ratio of the magnesium chloride solution to the ammonia water is 100:5.

[0096] The flame retardant and fire resistant silicone tapes prepared in the above Examples 1-3 and Comparative Examples 1-3 were tested, wherein the limiting oxygen index was tested according to GB / T 2406.2-2009, the tensile strength was tested according to GB / T 528-2009, the tear strength was tested according to GB / T529-2008, and the volume resistivity was tested according to GB / T 1692-2008.

[0097] .

[0098] Analysis of results: In Comparative Example 1, since magnesium hydroxide was directly added to the silica gel matrix, although the flame retardant properties were slightly reduced, its tensile strength and tear strength decreased sharply; in Comparative Example 2, since γ-aminopropyltriethoxysilane was not added to the biochar containing magnesium hydroxide and expanded graphite, partial agglomeration of magnesium hydroxide and expanded graphite was caused, which also affected the compatibility of biochar and silica gel system, resulting in a decrease in mechanical properties and flame retardant properties. In Comparative Example 3, no expanded graphite was added, and its tensile strength and tear strength were slightly reduced, but the flame retardant properties were greatly reduced.

[0099] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A flame retardant and fire resistant silicone belt, characterized in that: The silicone tape is composed of the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 60 parts of fumed silica, 3 parts of terminal hydroxyl polydimethylsiloxane, 0.5 parts of dioctyl acid phosphate, 2 parts of vinyl hydroxy silicone oil, 10 parts of modified biomass carbon powder, 0.2 parts of zinc stearate and 5.5 parts of vulcanizing agent. Wherein, the modified biomass carbon powder is prepared by the following preparation method: Step A, soaking 100g of biochar in 1000ml of magnesium hydroxide impregnation solution prepared by mixing ammonia water and magnesium chloride solution for 30min; Step B, then add 20gγ-aminopropyltriethoxysilane ultrasonic vibration 60min, separate, and dry at 20 ℃; Step C: Mix the dried biomass carbon and expanded graphite in a weight ratio of 10:1, and ultrasonically vibrate for 30 minutes to obtain modified biomass carbon powder. The biomass charcoal used is graphitized biomass charcoal obtained by pyrolysis of bamboo under nitrogen protection conditions, with a pyrolysis temperature of 1300°C, a heating rate of 280°C / h, and a pyrolysis time of 2 h. The concentration of the magnesium chloride solution in step A is 1 mol / L; the concentration of the ammonia water is about 26wt%; the volume ratio of the magnesium chloride solution to the ammonia water is 100:1, Wherein, the particle size of the biomass carbon powder is 10 mesh, and the particle size of the expanded graphite is 200 mesh. The fumed silica has a particle size of 25 nm and a specific surface area of ​​230 m 2 / g of fumed silica, The vulcanizing agent is a platinum vulcanizing agent, BPX-800 produced by Xiamen Baipoxin Industry and Trade Co., Ltd. The preparation method of the above-mentioned flame retardant and fire resistant silicone tape comprises the following steps: Step 1: firstly, methyl vinyl silicone rubber and fumed silica are mixed for the first time, then terminal hydroxyl polydimethylsiloxane, dioctyl acid phosphate, vinyl hydroxy silicone oil, modified biomass carbon powder and zinc stearate are added for the second mixing, and finally, a vulcanizing agent is added for the third mixing to obtain silicone rubber; Step 2: Pressing the silicone rubber into sheets to obtain a molded silicone sheet; Step 3: Apply glue on the silicone sheet, press the silicone sheet onto the glass fiber cloth, cut and package it to obtain the flame retardant and fire resistant silicone tape. Among them, the first mixing temperature is 125°C, the mixing time is 3h, the second mixing temperature is 130°C, the mixing time is 3h, the third mixing temperature is 30°C, and the mixing time is 30min; the pressing temperature in the tableting process is 150°C, the pressing pressure is 12MPa, and the pressing time is 5h.

2. A flame retardant and fire resistant silicone tape, characterized in that: The silicone tape is composed of the following raw materials in parts by weight: 110 parts of methyl vinyl silicone rubber, 65 parts of fumed silica, 5 parts of terminal hydroxyl polydimethylsiloxane, 0.8 parts of dioctyl acid phosphate, 4 parts of vinyl hydroxy silicone oil, 12 parts of modified biomass carbon powder, 0.3 parts of zinc stearate and 6.0 parts of vulcanizing agent. Wherein, the modified biomass carbon powder is prepared by the following preparation method: Step A, soaking 150g of biochar in 1000ml of magnesium hydroxide impregnation solution prepared by mixing ammonia water and magnesium chloride solution for 45min; Step B, then add 35gγ-aminopropyltriethoxysilane ultrasonic vibration 100min, separate, and dry at 30 ℃; Step C: Mix the dried biochar and expanded graphite in a weight ratio of 12:1, and ultrasonically vibrate for 40 minutes to obtain modified biochar powder. The biomass charcoal used is graphitized biomass charcoal obtained by pyrolysis of bamboo under nitrogen protection conditions, with a pyrolysis temperature of 1300°C, a heating rate of 280°C / h, and a pyrolysis time of 2 h. The concentration of the magnesium chloride solution in step A is 1.3 mol / L; the concentration of the ammonia water is about 26 wt%; the volume ratio of the magnesium chloride solution to the ammonia water is 100:

5. Wherein, the particle size of the biomass carbon is 50 mesh, and the particle size of the expanded graphite is 250 mesh. The fumed silica has a particle size of 30 nm and a specific surface area of ​​230 m 2 / g of fumed silica, The vulcanizing agent is a platinum vulcanizing agent, BPX-800 produced by Xiamen Baipoxin Industry and Trade Co., Ltd. A method for preparing the flame retardant and fire resistant silicone tape comprises the following steps: Step 1: firstly, methyl vinyl silicone rubber and fumed silica are mixed for the first time, then terminal hydroxyl polydimethylsiloxane, dioctyl acid phosphate, vinyl hydroxy silicone oil, modified biomass carbon powder and zinc stearate are added for the second mixing, and finally, a vulcanizing agent is added for the third mixing to obtain silicone rubber; Step 2: Pressing the silicone rubber into sheets to obtain a molded silicone sheet; Step 3: Apply glue on the silicone sheet, press the silicone sheet onto the glass fiber cloth, cut and package it to obtain the flame retardant and fire resistant silicone tape. Among them, the first mixing temperature is 130°C, the mixing time is 2h, the second mixing temperature is 135°C, the mixing time is 2h, the third mixing temperature is 40°C, and the mixing time is 20min; the pressing temperature in the tableting process is 160°C, the pressing pressure is 10MPa, and the pressing time is 3h.

3. A flame retardant and fire resistant silicone tape, characterized in that: The silicone tape is composed of the following raw materials in parts by weight: 120 parts of methyl vinyl silicone rubber, 70 parts of fumed silica, 7 parts of terminal hydroxyl polydimethylsiloxane, 1 part of dioctyl acid phosphate, 6 parts of vinyl hydroxy silicone oil, 15 parts of modified biomass carbon powder, 0.4 parts of zinc stearate and 6.5 parts of vulcanizing agent. Wherein, the modified biomass carbon powder is prepared by the following preparation method: Step A, soaking 200g of biochar in 1000ml of magnesium hydroxide impregnation solution prepared by mixing ammonia water and magnesium chloride solution for 60min; Step B, then add 50gγ-aminopropyltriethoxysilane ultrasonic vibration 120min, separate, and dry at 40 ℃; Step C: Mix the dried biomass carbon and expanded graphite in a weight ratio of 15:1, and ultrasonically vibrate for 60 minutes to obtain modified biomass carbon powder. Wherein, the concentration of the magnesium chloride solution in step A is 1.5 mol / L; the concentration of the ammonia water is about 26 wt%; the volume ratio of the magnesium chloride solution to the ammonia water is 100:10, Wherein, the particle size of the biomass carbon is 100 mesh, and the particle size of the expanded graphite is 300 mesh. The biochar used was graphitized biochar obtained by pyrolysis of bamboo under nitrogen protection, at a pyrolysis temperature of 1300°C, a heating rate of 280°C / h, and a pyrolysis time of 2 h. The fumed silica has a particle size of 35 nm and a specific surface area of ​​230 m 2 / g of fumed silica, The vulcanizing agent is a platinum vulcanizing agent, BPX-800 produced by Xiamen Baipoxin Industry and Trade Co., Ltd. A method for preparing the flame retardant and fire resistant silicone tape comprises the following steps: Step 1: firstly, methyl vinyl silicone rubber and fumed silica are mixed for the first time, then terminal hydroxyl polydimethylsiloxane, dioctyl acid phosphate, vinyl hydroxy silicone oil, modified biomass carbon powder and zinc stearate are added for the second mixing, and finally, a vulcanizing agent is added for the third mixing to obtain silicone rubber; Step 2: Pressing the silicone rubber into sheets to obtain a molded silicone sheet; Step 3: Apply glue on the silicone sheet, press the silicone sheet onto the glass fiber cloth, cut and package it to obtain the flame retardant and fire resistant silicone tape. Among them, the first mixing temperature is 135°C, the mixing time is 1h, the second mixing temperature is 140°C, the mixing time is 1h, the third mixing temperature is 45°C, and the mixing time is 15min; the pressing temperature in the tableting process is 170°C, the pressing pressure is 8MPa, and the pressing time is 1h.