Liquid flame-retardant coating silicone rubber and preparation process thereof

Abstract

The invention relates to the field of flame-retardant silicone rubber, and discloses liquid flame-retardant coating silicone rubber and a preparation process thereof. The liquid flame-retardant coating silicone rubber is double-component addition type liquid silicone rubber and is composed of a component A and a component B. The component A is prepared from the following raw materials in parts by weight: 20-30 parts of vinyl silicone oil, 15-25 parts of phenyl vinyl silicone oil, 12-18 parts of fumed silica, 5-10 parts of aluminum hydroxide, 10-15 parts of aluminum silicate fibers and 0.2-0.4 part of a platinum catalyst. The component B is prepared from the following raw materials in parts by weight: 20-30 parts of vinyl silicone oil, 6-8 parts of a crosslinking aid, 4-6 parts of a silane coupling agent, 12-18 parts of hydrogen-containing silicone oil and 0.05-0.15 part of an inhibitor. The liquid flame-retardant coating silicone rubber prepared by the invention has relatively good flexibility and adhesion stability, has relatively good flame retardance when being applied to materials such as fireproof cloth and the like, and is not easy to crack and fall off after being used for a long time.

Description

Technical Field

[0001] The present application relates to the field of flame retardant silicone rubber, and more specifically, to a liquid flame retardant coated silicone rubber and a preparation process thereof. Background Art

[0002] Liquid silicone rubber is a silicone rubber with silicon-oxygen bonds as the main chain. Compared with solid silicone rubber, liquid silicone rubber has better fluidity and easy processing performance, fast vulcanization, and is more environmentally friendly and safe. It can be widely used in electronics, aerospace, anti-fouling coatings, biomedicine, transportation and other fields.

[0003] Although liquid silicone rubber has excellent tear strength, resilience, thermal stability, water resistance, air permeability, heat aging resistance and weather resistance, when liquid silicone rubber is used in products such as fireproof cloth, liquid silicone rubber is generally used as a coating layer of fireproof cloth, which plays the role of flexibility, stability, high temperature resistance and corrosion resistance. However, its flame retardancy has obvious defects.

[0004] In order to improve the flame retardancy of liquid silicone rubber, the relevant technology adds flame retardant fillers into the liquid silicone rubber. The flame retardant fillers suitable for the silicone system generally include magnesium hydroxide, aluminum hydroxide, etc., but the proportion of flame retardant fillers used in liquid silicone rubber is relatively large. Although it can give liquid silicone rubber excellent flame retardancy, it will reduce the fracture performance and adhesion performance of liquid silicone rubber, making the coating layer of the fireproof cloth prone to cracking or falling off during use, reducing the performance of the fireproof cloth. Summary of the invention

[0005] In order to solve the problem that the existing liquid silicone rubber used in fireproof cloth cannot take into account the flame retardancy, adhesion and mechanical properties well, the present application provides a liquid flame retardant coated silicone rubber and a preparation process thereof.

[0006] In a first aspect, the present application provides a liquid flame retardant coated silicone rubber, which adopts the following technical solution: A liquid flame retardant coated silicone rubber, which is a two-component addition-type liquid silicone rubber, and consists of a component A and a component B. The component A is prepared from the following raw materials in parts by weight: 20-30 parts of vinyl silicone oil, 15-25 parts of phenyl vinyl silicone oil, 12-18 parts of fumed silica, 5-10 parts of aluminum hydroxide, 10-15 parts of aluminum silicate fiber, and 0.2-0.4 parts of a platinum catalyst; and the component B is prepared from the following raw materials in parts by weight: 20-30 parts of vinyl silicone oil, 6-8 parts of a crosslinking aid, 4-6 parts of a silane coupling agent, 12-18 parts of hydrogen-containing silicone oil, and 0.05-0.15 parts of an inhibitor.

[0007] By adopting the above technical scheme, the liquid flame-retardant coated silicone rubber of the present application is a two-component addition type liquid silicone rubber. When used, component A and component B are mixed to form a coated silicone rubber with viscosity and fluidity. Under the action of platinum catalyst, vinyl silicone oil and phenyl vinyl silicone oil provide vinyl, and react with hydrogen-containing silicone oil to form a silicone rubber cross-linked structure, thereby obtaining a silicone rubber coating with good flexibility and adhesion. By adding aluminum silicate fiber and aluminum hydroxide to the silicone rubber system for compounding, an efficient flame retardant system is formed, which can significantly reduce the amount of flame retardant, so that the coated silicone rubber has good flexibility and adhesion while having good flame retardancy; the cross-linking aid can further improve the cross-linking density of the silicone rubber system, thereby improving the flame retardancy, flexibility and adhesion of the prepared coated silicone rubber. The liquid flame-retardant coated silicone rubber prepared in the present application is used as a coating material for materials such as fireproof cloth and fireproof curtains, and has good flame retardancy, and is not easy to crack or fall off after long-term use.

[0008] Preferably, the aluminum silicate fiber is a modified aluminum silicate fiber, and the modified aluminum silicate fiber is prepared by modifying the following raw materials in parts by weight: Aluminum silicate fiber 70-80 parts 100-120 parts of 3-6wt% fluorotitanic acid aqueous solution Activator 1-3 parts Modifier 6-10 parts; The activator is composed of ammonium persulfate and oleylamine polyoxyethylene (2) ether in a weight ratio of 1:(0.5-1); the modifier is composed of dodecyl triethoxysilane and pentaerythritol triallyl ether in a weight ratio of 1:(1-2).

[0009] Preferably, the modified aluminum silicate fiber is prepared by the following steps: S1. Add aluminum silicate fiber to a fluorotitanic acid aqueous solution, add an activator, heat to 50-60° C., react for 20-40 minutes, filter, wash with water, and dry to obtain pretreated aluminum silicate fiber; S2. Kneading the pretreated aluminum silicate fiber and the modifier at a temperature of 70-80° C. to obtain modified aluminum silicate fiber.

[0010] By adopting the above technical scheme, ammonium persulfate and oleylamine polyoxyethylene (2) ether in a preferred weight ratio are used as activators. Under the action of the activator, the preferred reaction temperature and time are controlled so that the fluorotitanic acid aqueous solution micro-corrodes the surface of the aluminum silicate fiber, and the aluminum silicate fiber forms a rough surface without damaging the performance of the aluminum silicate fiber, thereby obtaining pretreated aluminum silicate fiber. The activator increases the dispersion distance between the aluminum silicate fiber molecules, and improves the dispersion and bonding performance of the subsequent modifier with the surface of the pretreated aluminum silicate fiber; then, ten of the pretreated aluminum silicate fibers are added in a preferred weight ratio. Dialkyl triethoxysilane and pentaerythritol triallyl ether are used as modifiers, and the aluminum silicate fiber and the modifier are kneaded under optimal temperature conditions, so that the modifier is dispersed and attached to the rough surface of the aluminum silicate fiber, and the dispersibility of the aluminum silicate fiber in the silicone rubber system is improved, thereby preparing modified aluminum silicate fiber. The modified aluminum silicate fiber can improve the compatibility of aluminum hydroxide and the silicone rubber system while further cross-linking with the silicone rubber system, thereby further improving the flexibility and adhesion of the prepared coated silicone rubber while improving the flame retardancy.

[0011] Preferably, the hydrogen-containing silicone oil is methyl hydrogen-containing silicone oil, and the hydrogen content is 1-1.3%.

[0012] By adopting the above technical solution, methyl hydrogen silicone oil is used as hydrogen silicone oil, and the hydrogen content in the methyl hydrogen silicone oil is controlled at 1-1.3%, a more uniform cross-linked network structure can be formed in the silicone rubber system, effectively improving the flexibility and adhesion performance of the prepared coated silicone rubber.

[0013] Preferably, the vinyl silicone oil in the component A and the component B is vinyl-terminated polydimethylsiloxane, and the vinyl content is 0.8-1.2%.

[0014] By adopting the above technical scheme, using terminal vinyl polydimethylsiloxane as the vinyl silicone oil in component A and component B, and controlling the vinyl content to 0.8-1.2%, the crosslinking density and intermolecular interaction force of the liquid flame-retardant coated silicone rubber can be effectively improved, so that the silicone rubber system has good viscosity and fluidity while improving the crosslinking stability with hydrogen-containing silicone oil, thereby improving the performance of the prepared coated silicone rubber.

[0015] Preferably, the phenyl vinyl silicone oil is vinyl terminated phenyl methyl siloxane with a vinyl content of 1.3-1.7%.

[0016] By adopting the above technical scheme, vinyl-terminated phenylmethylsiloxane is used as phenylvinyl silicone oil, and the vinyl content is controlled at 1.3-1.7%, which can produce a good synergistic effect with vinyl silicone oil, thereby improving the performance of the prepared coated silicone rubber.

[0017] Preferably, the crosslinking aid is composed of vinyl-terminated T-type phenyl polysiloxane and polyethylene glycol monoallyl ether in a weight ratio of 1:(1-3).

[0018] By adopting the above technical scheme, using vinyl-terminated T-phenyl polysiloxane and polyethylene glycol monoallyl ether in an optimal weight ratio as cross-linking aids, the cross-linking density of the silicone rubber system can be significantly improved, and a good synergistic effect can be produced with the modified aluminum silicate fiber, further improving the dispersion and interweaving stability of the modified aluminum silicate fiber and aluminum hydroxide in the silicone rubber system, thereby improving the flame retardant properties of the liquid flame retardant coated silicone rubber, while improving the adhesion and flexibility of the liquid flame retardant coated silicone rubber.

[0019] Preferably, the silane coupling agent is composed of vinyl tris(2-methoxyethoxy)silane and divinyltetramethyldisiloxane in a weight ratio of (0.2-0.5):1.

[0020] By adopting the above technical solution, the combination of vinyl tris (2-methoxyethoxy) silane and divinyl tetramethyl disiloxane can form a more stable chemical bond in the silicone rubber system, enhance the interfacial bonding force, and further improve the flame retardancy, adhesion and flexibility of the prepared liquid flame retardant coated silicone rubber. Preferably, the inhibitor is any one or a combination of acetylene cyclohexanol and methyl butynol.

[0021] By adopting the above technical solution, the above inhibitor can effectively control the activity of the platinum catalyst, prevent the premature cross-linking reaction during the silicone rubber mixing process, and improve the stability of the obtained liquid flame-retardant coated silicone rubber.

[0022] In a second aspect, the present application provides a preparation process of a liquid flame retardant coated silicone rubber, which adopts the following technical solution: A preparation process of liquid flame retardant coated silicone rubber comprises the following steps: Component A: vinyl silicone oil, phenyl vinyl silicone oil, fumed silica, aluminum hydroxide, aluminum silicate fiber and platinum catalyst are mixed to prepare component A; Component B: Vinyl silicone oil, a cross-linking aid, a silane coupling agent, hydrogen-containing silicone oil and an inhibitor are mixed to prepare component B.

[0023] By adopting the above technical solution, the preparation process of the present application is simple, and the preparation process can effectively prepare a liquid flame retardant coated silicone rubber with excellent flame retardancy, adhesion and flexibility.

[0024] In summary, this application has the following beneficial effects: 1. The liquid flame-retardant coated silicone rubber of the present application is a two-component addition-type liquid silicone rubber. When used, component A and component B are mixed to form a coated silicone rubber with viscosity and fluidity. Component A is composed of vinyl silicone oil, phenyl vinyl silicone oil, fumed silica, aluminum hydroxide, aluminum silicate fiber and platinum catalyst, and component B is composed of vinyl silicone oil, cross-linking aid, silane coupling agent, hydrogen-containing silicone oil and inhibitor. By adding aluminum silicate fiber and aluminum hydroxide to the silicone rubber system for compounding, an efficient flame retardant system is formed, which can significantly reduce the amount of flame retardant, and compounding with the cross-linking aid makes the coated silicone rubber have good flame retardancy while having good flexibility and adhesion. The liquid flame-retardant coated silicone rubber prepared in the present application is used as a coating material for fireproof cloth, etc. It has good flame retardancy and is not easy to crack or fall off after long-term use.

[0025] 2. Aluminum silicate fibers are modified using ammonium persulfate and oleylamine polyoxyethylene (2) ether as activators, and dodecyl triethoxysilane and pentaerythritol triallyl ether as modifiers. The modified aluminum silicate fibers can improve the compatibility of aluminum hydroxide and silicone rubber systems while further cross-linking with the silicone rubber system, thereby improving the flame retardancy and further improving the flexibility and adhesion of the coated silicone rubber.

[0026] 3. Using vinyl-terminated T-phenyl polysiloxane and polyethylene glycol monoallyl ether in an optimal weight ratio as cross-linking aids can significantly improve the cross-linking density of the silicone rubber system, produce a good synergistic effect with modified aluminum silicate fibers, and further improve the dispersion and interweaving stability of modified aluminum silicate fibers and aluminum hydroxide in the silicone rubber system, thereby improving the flame retardant properties of liquid flame retardant coated silicone rubber, while improving the adhesion and flexibility of the liquid flame retardant coated silicone rubber.

[0027] 4. By using vinyl tri(2-methoxyethoxy)silane and divinyltetramethyldisiloxane in combination, a more stable chemical bond can be formed in the silicone rubber system, the interfacial bonding force can be enhanced, and the flame retardancy, adhesion and flexibility of the prepared liquid flame retardant coated silicone rubber can be further improved. DETAILED DESCRIPTION

[0028] The present application is further described in detail below with reference to the embodiments.

[0029] The following are the sources and specifications of some raw materials of this application. The raw materials used in the preparation examples and embodiments of this application can be obtained from the market, including but not limited to the raw materials of the following models and manufacturers. Raw materials with equivalent performance can be used: 1. Vinyl silicone oil: vinyl-terminated polydimethylsiloxane, Jipeng, vinyl content 0.8-1.2%.

[0030] 2. Phenyl vinyl silicone oil: vinyl terminated phenyl methylsiloxane, model IOTA 252, vinyl content of 1.3-1.7%; 3. Hydrogenated silicone oil: Jipeng, methyl hydrogenated silicone oil, hydrogen content 1-1.3%; 4. Fumed silica: Cabot LM150; 5. Aluminum hydroxide: particle size 0.1-0.3μm, specific surface area 180-240m 2 / g; 6. Aluminum silicate fiber: diameter 10-20μm, length 0.1-1mm; 7. Oleylamine polyoxyethylene (2) ether: CAS No. 13127-82-7, content 99%; 8. Vinyl-terminated T-phenyl polysiloxane: Model IOTA253, vinyl content 1.5-2mmol / g; 9. Polyethylene glycol monoallyl ether: Haishihua, CAS No. 27274-31-3; 10. Platinum catalyst: platinum content 10000-20000ppm.

[0031] Preparation example of modified aluminum silicate fiber Preparation Example 1 Preparation Example 1 discloses a modified aluminum silicate fiber, which is prepared by the following steps: S1. Add 7 kg of aluminum silicate fiber to 10 kg of 3 wt % fluorotitanic acid aqueous solution, add 0.3 kg of activator (composed of ammonium persulfate and sodium dodecyl sulfate in a weight ratio of 1:0.5), heat to 50° C., react for 40 min, filter, wash with water, and dry to obtain pretreated aluminum silicate fiber; S2. The pretreated aluminum silicate fiber and 0.8 kg of vinyl trimethoxy silane as a modifier are kneaded at a temperature of 70° C. for 30 minutes to obtain modified aluminum silicate fiber.

[0032] Preparation Example 2-3 The difference between Preparation Example 2-3 and Preparation Example 1 is that the amount of raw materials used and the preparation conditions are different, see Table 1 below for details.

[0033] Table 1 Parameters of Preparation Examples 1-3 Preparation Example 4 The difference between Preparation Example 4 and Preparation Example 1 is that the type of activator is different. The activator in Preparation Example 4 is composed of ammonium persulfate and oleylamine polyoxyethylene (2) ether in a weight ratio of 1:0.5, and the rest is the same as Preparation Example 1.

[0034] Preparation Example 5 The difference between Preparation Example 5 and Preparation Example 1 is that the activator in Preparation Example 5 is composed of ammonium persulfate and oleylamine polyoxyethylene (2) ether in a weight ratio of 1:1, and the rest is the same as Preparation Example 1.

[0035] Preparation Example 6 The difference between Preparation Example 6 and Preparation Example 5 is that the modifier is different. The modifier in Preparation Example 6 is composed of dodecyltriethoxysilane and pentaerythritol triallyl ether in a weight ratio of 1:1, and the rest is the same as Preparation Example 5.

[0036] Preparation Example 7 The difference between Preparation Example 7 and Preparation Example 5 is that the modifier in Preparation Example 7 is composed of dodecyltriethoxysilane and pentaerythritol triallyl ether in a weight ratio of 1:2, and the rest is the same as Preparation Example 5. Example

[0037] Example 1 Example 1 discloses a liquid flame retardant coated silicone rubber, which is a two-component addition-type liquid silicone rubber, consisting of component A and component B. Component A is prepared by the following steps: 2kg of vinyl silicone oil, 2.5kg of phenyl vinyl silicone oil, 1.2kg of fumed silica, 0.5kg of aluminum hydroxide, 1.5kg of aluminum silicate fiber and 0.02kg of platinum catalyst are mixed to prepare component A; component B is prepared by the following steps: 2kg of vinyl silicone oil, 0.6kg of a cross-linking aid (composed of 3-aminopropyldiethoxymethylsilane: polyethylene glycol monoallyl ether in a weight ratio of 1:1), 0.4kg of divinyltetramethyldisiloxane as a silane coupling agent, 1.2kg of hydrogen-containing silicone oil and 0.005kg of acetylene cyclohexanol as an inhibitor are mixed to prepare component B.

[0038] Example 2-3 The difference between Example 2-3 and Example 1 is that the raw material composition, dosage and preparation parameters are different, see Table 2 below for details.

[0039] Table 2 Parameters of Examples 1-3 Embodiment 4-10 The difference between Examples 4-10 and Example 1 is that the sources of aluminum silicate fibers are different, see Table 3 below for details.

[0040] Table 3 Sources of aluminum silicate fibers of Examples 4-10 Example Aluminum silicate fiber source Example 4 Preparation Example 1 Example 5 Preparation Example 2 Example 6 Preparation Example 3 Example 7 Preparation Example 4 Example 8 Preparation Example 5 Example 9 Preparation Example 6 Example 10 Preparation Example 7 Embodiment 11 The difference between Example 11 and Example 10 is that the crosslinking aid is different. The crosslinking aid in Example 11 is composed of vinyl-terminated T-phenyl polysiloxane and polyethylene glycol monoallyl ether in a weight ratio of 1:1, and the rest is the same as Example 10.

[0041] Example 12 The difference between Example 12 and Example 10 is that the crosslinking auxiliary agent consists of vinyl-terminated T-type phenyl polysiloxane and polyethylene glycol monoallyl ether in a weight ratio of 1:3, and the rest is the same as Example 10.

[0042] Example 13 The difference between Example 13 and Example 11 is that the silane coupling agent is different. The silane coupling agent in Example 13 is composed of vinyl tris (2-methoxyethoxy) silane and divinyl tetramethyl disiloxane in a weight ratio of 0.2:1, and the rest is the same as Example 11.

[0043] Embodiment 14 The difference between Example 14 and Example 11 is that the silane coupling agent consists of vinyl tris (2-methoxyethoxy) silane and divinyl tetramethyl disiloxane in a weight ratio of 0.5:1, and the rest is the same as Example 11.

[0044] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that an equal amount of aluminum silicate fiber is replaced by ammonium phosphate flame retardant, and the rest is the same as Example 1.

[0045] Performance testing The following is a performance test of the liquid flame retardant coated silicone rubber obtained in Examples 1-14 and Comparative Example 1: Mix component A and component B of liquid flame retardant silicone rubber in a weight ratio of 1:1. 2 Both sides of the plain woven glass fiber cloth are coated, and the coating amount on each side is 30g / m 2 , and then vulcanized at a temperature of 140°C to form a silicone rubber coating to obtain a fireproof cloth.

[0046] 1. Tear strength test Refer to the test method in GB / T 529-2009 to test the tear strength of the fireproof cloth (unit: MPa), test and record the test results; 2. Peel strength test Use a tensile testing machine to test the peel strength (unit: MPa) of the silicone rubber coating of the fireproof cloth, and test and record the test results; 3. Limiting oxygen index test According to the test method in GB / T 10707-2008, the fireproof fabric is tested for limiting oxygen index, and the test results are recorded.

[0047] The following are the performance test data of the liquid flame retardant coated silicone rubber prepared in Examples 1-14 and Comparative Example 1, see Table 4 below for details.

[0048] Table 4 Performance data of liquid flame retardant coated silicone rubber Combining Examples 1-3 and Comparative Example 1 and Table 4, it can be concluded that the use of the aluminum hydroxide and aluminum silicate fibers of the present application for compounding and adding them to the silicone rubber of the present application as a flame retardant can improve the flame retardancy, adhesion and flexibility of the silicone rubber with a small addition amount. Compared with Comparative Example 1, Example 1 has a limiting oxygen index increased by 1.9%, a peel strength increased by 4.1 MPa, and a tear strength increased by 13.9 MPa. This may be because the interwoven system of aluminum silicate fibers and aluminum hydroxide improves the dispersibility and compatibility of the flame retardant with the rubber.

[0049] Combining Examples 1-3 and Examples 4-10 and Table 4, it can be concluded that by optimizing the amount and ratio of the activator and the modifier, the limiting oxygen index of the silicone rubber obtained is increased by 3.8%, the peel strength is increased by 3.8 MPa, and the tear strength is increased by 4 MPa, indicating that surface modification of the aluminum silicate fiber of the present application can significantly improve the flame retardancy of the silicone rubber obtained, while improving the adhesion and flexibility of the silicone rubber.

[0050] Further combined with Example 10 and Examples 11-14 and Table 4, it can be concluded that further optimizing the crosslinking aid and silane coupling agent used in the silicone rubber can further improve the flame retardancy, adhesion and flexibility of the silicone rubber. Compared with Example 10, the tear strength and peel strength of Examples 11-12 are improved, and the limiting oxygen index is also improved, which may be because the crosslinking aid with a better weight ratio further improves the crosslinking density of the silicone rubber; Compared with Example 11, the tear strength and peel strength of Examples 13-14 are improved, and the limiting oxygen index is also improved, which may be because the selection of the silane coupling agent with a better weight ratio further improves the compatibility and dispersibility of the system.

[0051] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A liquid flame retardant coated silicone rubber, characterized in that: The liquid flame retardant coated silicone rubber is a two-component addition-type liquid silicone rubber, which consists of component A and component B. Component A is prepared from the following raw materials in parts by weight: 20-30 parts of vinyl silicone oil, 15-25 parts of phenyl vinyl silicone oil, 12-18 parts of fumed silica, 5-10 parts of aluminum hydroxide, 10-15 parts of aluminum silicate fiber, and 0.2-0.4 parts of platinum catalyst; component B is prepared from the following raw materials in parts by weight: 20-30 parts of vinyl silicone oil, 6-8 parts of crosslinking aid, 4-6 parts of silane coupling agent, 12-18 parts of hydrogen-containing silicone oil, and 0.05-0.15 parts of inhibitor.

2. The liquid flame retardant coated silicone rubber according to claim 1, characterized in that: The aluminum silicate fiber is a modified aluminum silicate fiber, and the modified aluminum silicate fiber is prepared by modifying the following raw materials in parts by weight: Aluminum silicate fiber 70-80 parts 100-120 parts of 3-6wt% fluorotitanic acid aqueous solution Activator 1-3 parts Modifier 6-10 parts; The activator is composed of ammonium persulfate and oleylamine polyoxyethylene (2) ether in a weight ratio of 1: (0.5-1); the modifier is composed of dodecyl triethoxysilane and pentaerythritol triallyl ether in a weight ratio of 1: (1-2).

3. The liquid flame retardant coated silicone rubber according to claim 2, characterized in that: The modified aluminum silicate fiber is prepared by the following steps: S1. Add aluminum silicate fiber to a fluorotitanic acid aqueous solution, add an activator, heat to 50-60° C., react for 20-40 min, filter, wash with water, and dry to obtain pretreated aluminum silicate fiber; S2. Kneading the pretreated aluminum silicate fiber and the modifier at a temperature of 70-80° C. to obtain modified aluminum silicate fiber.

4. The liquid flame retardant coated silicone rubber according to claim 1, characterized in that: The hydrogen-containing silicone oil is methyl hydrogen-containing silicone oil, and the hydrogen content is 1-1.3%.

5. The liquid flame retardant coated silicone rubber according to claim 1, characterized in that: The vinyl silicone oils in the component A and the component B are both vinyl-terminated polydimethylsiloxane, and the vinyl content is 0.8-1.2%.

6. The liquid flame retardant coated silicone rubber according to claim 1, characterized in that: The phenyl vinyl silicone oil is vinyl-terminated phenyl methyl siloxane with a vinyl content of 1.3-1.7%.

7. The liquid flame retardant coated silicone rubber according to claim 1, characterized in that: The cross-linking auxiliary agent is composed of vinyl-terminated T-type phenyl polysiloxane and polyethylene glycol monoallyl ether in a weight ratio of 1:(1-3).

8. The liquid flame retardant coated silicone rubber according to claim 1, characterized in that: The silane coupling agent is composed of vinyl tris(2-methoxyethoxy) silane and divinyl tetramethyl disiloxane in a weight ratio of (0.2-0.5):

1.

9. The liquid flame retardant coated silicone rubber according to claim 1, characterized in that: The inhibitor is any one or a combination of acetylene cyclohexanol and methyl butynol.

10. A process for preparing a liquid flame retardant coated silicone rubber as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Component A: vinyl silicone oil, phenyl vinyl silicone oil, fumed silica, aluminum hydroxide, aluminum silicate fiber and platinum catalyst are mixed to prepare component A; Component B: Vinyl silicone oil, a cross-linking aid, a silane coupling agent, hydrogen-containing silicone oil and an inhibitor are mixed to prepare component B.

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