Platinum flame retardant for silicone rubber and method for preparing the same

Abstract

The application discloses to the technical field of catalysts, and particularly relates to a platinum gold flame retardant for silicone rubber and a preparation method thereof, which comprises raw materials, and the raw materials comprise, in terms of parts, allyl phenolic compounds, an organic solvent, alkali, PCl3, a silane coupling agent SM1, AIBN, an alkoxy hydrogen silane SM2, aluminum hydroxide powder, chloroplatinic acid, isopropyl alcohol, sodium bicarbonate, 1,3-divinyl tetramethyl disiloxane and alcohol. The silane coupling agent SG-1 modified by phosphine is prepared by firstly coupling the silane coupling agent containing mercapto type, the alkoxy silicon hydrogen silane and the phosphite ester, then modifying the aluminum hydroxide, and then the ligand exchange is carried out between the SG-1 and the Karstedt catalyst to prepare the single-component platinum catalyst SG-2. The complex of the single-component platinum catalyst SG-2 can be used as an effective catalyst for the silicon hydrogen addition reaction, and no additional inhibitor needs to be added when the single-component platinum catalyst SG-2 is used, so that the single-component platinum catalyst SG-2 can be used in the field of silicone rubber and has excellent flame retardant performance.

Description

Technical Field

[0001] This invention relates to the field of catalyst technology, specifically to a platinum flame retardant for silicone rubber and its preparation method. Background Technology

[0002] Silicone rubber possesses excellent properties such as resistance to high and low temperatures and oxygen; however, its inherent flammability limits its further development in the electronics, electrical, automotive, and aerospace fields. Therefore, the preparation of flame-retardant silicone rubber is of great research significance. Currently, the most widely used flame retardants for silicone rubber are halogen-free flame retardants, such as aluminum hydroxide, which are typically used in synergistic flame retardancy with platinum catalysts. However, this process presents the following problems:

[0003] 1) The most widely used platinum catalyst is the cassiterite catalyst, but it is unstable at high temperatures, which seriously affects its flame retardant performance. Therefore, it is necessary to introduce alkynyl alcohols, phosphites, and benzotriazole inhibitors to protect the catalyst.

[0004] 2) When aluminum hydroxide and platinum catalyst are physically mixed, they can synergistically retard flame. Platinum catalyst has poor dispersion performance in aluminum hydroxide and is prone to agglomeration, which leads to a decrease in platinum utilization.

[0005] In view of the shortcomings of existing technologies, this invention provides a platinum flame retardant for silicone rubber and its preparation method, which chemically combines silane coupling agent-modified aluminum hydroxide and platinum, thereby improving the utilization rate of platinum and introducing phosphite ester-type ligands to enhance the stability of platinum. This novel platinum catalyst exhibits excellent flame retardant properties when applied to silicone rubber. Summary of the Invention

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0007] A platinum flame retardant for silicone rubber comprises raw materials, which, by weight, include: 4-6 parts of 2-allylphenol compound, 100-160 parts of organic solvent, 1-2 parts of alkali, 4-6 parts of PCl3, 13-7 parts of silane coupling agent SM1, 0.4-0.6 parts of AIBN, 3-7 parts of alkoxyhydrosilane SM2, 4-8 parts of aluminum hydroxide powder, 18-22 parts of chloroplatinic acid, 250-270 parts of isopropanol, 25-27 parts of sodium bicarbonate, 80-100 parts of 1,3-divinyltetramethyldisiloxane, and 110-130 parts of alcohol.

[0008] A method for preparing a platinum flame retardant for silicone rubber includes the following specific steps:

[0009] Step 1, Synthesis of S1: 2-Allylphenol compounds were dissolved in an organic solvent, and a base was slowly added at 0°C while stirring at 0°C for 30 min. PCl3 was then added, and the reaction was heated for three hours. After monitoring the reaction to ensure completion, the product was quenched, cooled, and filtered to obtain the target product S1, as shown in the following structural formula:

[0010]

[0011] Step 2, Synthesis of S2: The synthesis of S2 includes the following methods:

[0012] Method 1: Add S1 and silane coupling agent SM1 to an organic solvent, then add AIBN, heat and react for three hours. After monitoring the reaction of the raw materials, cool, filter, and wash with alcohol to obtain the target product S2.

[0013] Method 2: Add S1 and alkoxysilane SM2 to an organic solvent, then add a caster catalyst, heat the mixture for two hours, monitor the reaction of the raw materials until the reaction is complete, and then cool, filter, and wash with alcohol to obtain the target product S2.

[0014] Step 3, Synthesis of SG-1: Take the dried aluminum hydroxide powder, put it into a universal pulverizer, add S2, and pulverize it in the pulverizer for ten minutes to obtain silane coupling agent modified aluminum hydroxide SG-1.

[0015] Step 4, synthesis of the Castel catalyst: chloroplatinic acid, isopropanol, sodium bicarbonate and 1,3-divinyltetramethyldisiloxane are added to a reaction vessel and reacted at 70°C for one hour. The mixture is then filtered and concentrated under reduced pressure to obtain the Castel catalyst.

[0016] Step 5, Synthesis of SG-2: Castella catalyst, SG-1 and organic solvent are added to a flask and stirred under N2. The reaction is then monitored using GCMS. After that, alcohol is added to the precipitate, and the mixture is stirred, filtered, and the precipitate is washed with alcohol before drying to obtain the target product SG-2.

[0017] In a preferred embodiment of the preparation method of the platinum flame retardant for silicone rubber according to the present invention, the 2-allylphenol compound refers to a class of compounds with the following structure:

[0018]

[0019] R1 is an alkyl group containing 1 to 6 carbon atoms.

[0020] In a preferred embodiment of the preparation method of the platinum flame retardant for silicone rubber according to the present invention, the organic solvent is one or more of toluene, tetrahydrofuran, N,N-dimethylformamide, dichloromethane, and petroleum ether.

[0021] In a preferred embodiment of the preparation method of the platinum flame retardant for silicone rubber according to the present invention, the alkali is one or more of sodium hydride, triethylamine, sodium carbonate, sodium bicarbonate, sodium hydroxide, and potassium hydroxide.

[0022] In a preferred embodiment of the preparation method of the platinum flame retardant for silicone rubber according to the present invention, the heating temperature in step one is 50-90℃, and the heating temperature in step two is 50-90℃.

[0023] In a preferred embodiment of the preparation method of the platinum flame retardant for silicone rubber according to the present invention, the silane coupling agent SM1 is one or more of 3-mercaptopropyltriethoxysilane, mercaptopropyltrimethoxysilane, and 2-mercaptoethyltriethoxysilane.

[0024] In a preferred embodiment of the preparation method of the platinum flame retardant for silicone rubber described in this invention, the alkoxysilane SM2 is one or more of trimethoxysilane and triethoxysilane.

[0025] In a preferred embodiment of the preparation method of the platinum flame retardant for silicone rubber according to the present invention, the alcohol is one or more of methanol, ethanol, and isopropanol.

[0026] Compared with existing technologies:

[0027] The preparation method provided by this invention utilizes the reaction of unsaturated phosphite with a sulfur-containing hydrocarbon silane coupling agent or an alkoxyhydrosilane to prepare a novel silane coupling agent S2. Then, aluminum hydroxide is modified to prepare a novel silane coupling agent-modified aluminum hydroxide SG-1. Next, SG-1 is combined with a cascade catalyst via ligand exchange to prepare a single-component platinum catalyst SG-2. This single-component catalyst is suitable for hydrosilylation reactions. Utilizing the electronic and steric effects of phosphine, the single-component catalyst exhibits low catalytic activity at room temperature, while rapid catalysis of hydrosilylation reactions occurs with increased temperature. Furthermore, the chemical combination of the novel silane coupling agent-modified aluminum hydroxide and platinum can produce silicone rubber products with excellent flame-retardant properties. Attached Figure Description

[0028] Figure 1 This is a schematic diagram illustrating the synthesis and ligand exchange process of the phosphine-modified silane coupling agent of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below.

[0030] Example 1:

[0031] This invention provides a method for preparing a platinum flame retardant for silicone rubber, comprising the following specific steps:

[0032] Step 1: Dissolve 5g of 2-allylphenol in 50mL of tetrahydrofuran, slowly add 1.5g of NaH at 0°C, stir at 0°C for 30min, then add 5g of PCl3, react at 60°C for 3 hours, monitor the reaction of the raw materials until it is complete, quench the reaction, cool and filter, wash with ethanol, and concentrate under reduced pressure to obtain 15g of the target product S1.

[0033] Step 2: Add 2g S1 and 6g 3-mercaptopropyltriethoxysilane to 50mL toluene, then add 0.5g AIBN, react at 60℃ for three hours, monitor the reaction of the raw materials until it is complete, cool, filter, and wash with ethanol to obtain 7g of the target product S2;

[0034] Step 3: Take 50g of aluminum hydroxide powder dried in a 120℃ oven (specific surface area 100m²). 2 / g), put it into a universal grinder, add 5.7g S2 in batches, grind in the grinder for 20 minutes to obtain 55.7g of 3-mercaptopropyltriethoxysilane modified aluminum hydroxide SG-1A;

[0035] Step 4: Preheat the reactor to 70°C, adjust the rotation speed to a suitable level, add 20g chloroplatinic acid, 260mL isopropanol, 26g sodium bicarbonate, and 90mL 1,3-divinyltetramethyldisiloxane, and react at 70°C for one hour. Cool to room temperature, filter the mixture three times, and concentrate the filtrate under reduced pressure to remove the solvent and other volatile impurities, obtaining 100g of caster catalyst, which is then diluted to 5000ppm for the next step.

[0036] Step 5: Add 20g of caster catalyst (equivalent to 512.8umol), 5.7g of SG-1A, and 20mL of toluene solution to a three-necked round-bottom flask and react completely at 60℃ under N2. Add isopropanol to the precipitate, stir and mix, filter, wash the precipitate three times with isopropanol, concentrate and dry under vacuum to obtain 5g of the target product SG-2A.

[0037] Example 2:

[0038] This invention provides a method for preparing a platinum flame retardant for silicone rubber, comprising the following specific steps:

[0039] Step 1: Dissolve 5g of 2-allylphenol in 50mL of tetrahydrofuran, slowly add 1.5g of NaH at 0°C, stir at 0°C for 30min, then add 5g of PCl3, react at 60°C for 3 hours, monitor the reaction of the raw materials until it is complete, quench the reaction, cool and filter, wash with ethanol, and concentrate under reduced pressure to obtain 15g of the target product S1.

[0040] Step 2: Add 2g S1 and 6g mercaptopropyltrimethoxysilane to 50mL toluene, then add 0.5g AIBN, react at 60℃ for three hours, monitor the reaction of the starting materials until it is complete, cool, filter, and wash with ethanol to obtain 6.9g of the target product S2;

[0041] Step 3: Take 50g of aluminum hydroxide powder dried in a 120℃ oven (specific surface area 100m²). 2 / g), put it into a universal grinder, add 5.1g S2 in batches, grind in the grinder for 20 minutes to obtain 55.1g of mercaptopropyltrimethoxysilane modified aluminum hydroxide SG-1B;

[0042] Step 4: Preheat the reactor to 70°C, adjust the rotation speed to a suitable level, add 20g chloroplatinic acid, 260mL isopropanol, 26g sodium bicarbonate, and 90mL 1,3-divinyltetramethyldisiloxane, and react at 70°C for one hour. Cool to room temperature, filter the mixture three times, and concentrate the filtrate under reduced pressure to remove the solvent and other volatile impurities, obtaining 100g of caster catalyst, which is then diluted to 5000ppm for the next step.

[0043] Step 5: Add 20g of caster catalyst (equivalent to 512.8umol), 5.6g of SG-1B, and 20mL of toluene solution to a three-necked round-bottom flask and react completely at 60℃ under N2. Add isopropanol to the precipitate, stir and mix, filter, wash the precipitate three times with isopropanol, concentrate and dry under vacuum to obtain 5.1g of the target product SG-2B.

[0044] Example 3:

[0045] This invention provides a method for preparing a platinum flame retardant for silicone rubber, comprising the following specific steps:

[0046] Step 1: Dissolve 5g of 2-allylphenol in 50mL of tetrahydrofuran, slowly add 1.5g of NaH at 0°C, stir at 0°C for 30min, then add 5g of PCl3, react at 60°C for 3 hours, monitor the reaction of the raw materials until it is complete, quench the reaction, cool and filter, wash with ethanol, and concentrate under reduced pressure to obtain 15g of the target product S1.

[0047] Step 2: Add 2g S1 and 6g 2-mercaptoethyltriethoxysilane to 50mL toluene, then add 0.5g AIBN, react at 60℃ for three hours, monitor the reaction of the raw materials until it is complete, cool, filter, and wash with ethanol to obtain 7.5g of the target product S2;

[0048] Step 3: Take 50g of aluminum hydroxide powder dried in a 120℃ oven (specific surface area 100m²). 2 / g), put it into a universal grinder, add 4.9g S2 in batches, grind in the grinder for 20 minutes to obtain 54.9g of 2-mercaptoethyltriethoxysilane modified aluminum hydroxide SG-1C;

[0049] Step 4: Preheat the reactor to 70°C, adjust the rotation speed to a suitable level, add 20g chloroplatinic acid, 260mL isopropanol, 26g sodium bicarbonate, and 90mL 1,3-divinyltetramethyldisiloxane, and react at 70°C for one hour. Cool to room temperature, filter the mixture three times, and concentrate the filtrate under reduced pressure to remove the solvent and other volatile impurities, obtaining 100g of caster catalyst, which is then diluted to 5000ppm for the next step.

[0050] Step 5: Add 20g of caster catalyst (equivalent to 512.8umol), 5.7g of SG-1C, and 20mL of toluene solution to a three-necked round-bottom flask and react completely at 60℃ under N2. Add isopropanol to the precipitate, stir and mix, filter, wash the precipitate three times with isopropanol, concentrate and dry under vacuum to obtain 5.0g of the target product SG-2C.

[0051] Example 4:

[0052] This invention provides a method for preparing a platinum flame retardant for silicone rubber, comprising the following specific steps:

[0053] Step 1: Dissolve 5g of 2-allylphenol in 50mL of tetrahydrofuran, slowly add 1.5g of NaH at 0°C, stir at 0°C for 30min, then add 5g of PCl3, react at 60°C for 3 hours, monitor the reaction of the raw materials until it is complete, quench the reaction, cool and filter, wash with ethanol, and concentrate under reduced pressure to obtain 15g of the target product S1.

[0054] Step 2: Add 4g S1 and 3.4g trimethoxysilane to 60mL toluene, then add 1 drop of 0.1M castor catalyst, react at 80℃ for two hours, monitor the reaction of the raw materials until it is complete, cool, filter, and wash with methanol to obtain 7.3g of the target product S2;

[0055] Step 3: Take 50g of aluminum hydroxide powder dried in a 120℃ oven (specific surface area 100m²). 2 / g), put it into a universal grinder, add 3.98g S2 in batches, grind in the grinder for 20 minutes, and you can get 54.0g of trimethoxysilane modified aluminum hydroxide SG-1D;

[0056] Step 4: Preheat the reactor to 70°C, adjust the rotation speed to a suitable level, add 20g chloroplatinic acid, 260mL isopropanol, 26g sodium bicarbonate, and 90mL 1,3-divinyltetramethyldisiloxane, and react at 70°C for one hour. Cool to room temperature, filter the mixture three times, and concentrate the filtrate under reduced pressure to remove the solvent and other volatile impurities, obtaining 100g of caster catalyst, which is then diluted to 5000ppm for the next step.

[0057] Step 5: Add 20g of caster catalyst (equivalent to 512.8umol), 5.53g of SG-1D, and 20mL of toluene solution to a three-necked round-bottom flask and react completely at 60℃ under N2. Add isopropanol to the precipitate, stir and mix, filter, wash the precipitate three times with isopropanol, concentrate and dry under vacuum to obtain 5.3g of the target product SG-2D.

[0058] Example 5:

[0059] This invention provides a method for preparing a platinum flame retardant for silicone rubber, comprising the following specific steps:

[0060] Step 1: Dissolve 5g of 2-allylphenol in 50mL of tetrahydrofuran, slowly add 1.5g of NaH at 0°C, stir at 0°C for 30min, then add 5g of PCl3, react at 60°C for 3 hours, monitor the reaction of the raw materials until it is complete, quench the reaction, cool and filter, wash with ethanol, and concentrate under reduced pressure to obtain 15g of the target product S1.

[0061] Step 2: Add 4g S1 and 4.6g triethoxysilane to 80mL toluene, then add 1 drop of 0.1M castor catalyst, react at 80℃ for two hours, monitor the reaction of the raw materials until it is complete, cool, filter, and wash with methanol to obtain 8.5g of the target product S2;

[0062] Step 3: Take 50g of aluminum hydroxide powder dried in a 120℃ oven (specific surface area 100m²). 2 / g), put it into a universal grinder, add 4.61g S2 in batches, grind in the grinder for 20 minutes, and you can get 54.0g of triethoxysilane modified aluminum hydroxide SG-1E;

[0063] Step 4: Preheat the reactor to 70°C, adjust the rotation speed to a suitable level, add 20g chloroplatinic acid, 260mL isopropanol, 26g sodium bicarbonate, and 90mL 1,3-divinyltetramethyldisiloxane, and react at 70°C for one hour. Cool to room temperature, filter the mixture three times, and concentrate the filtrate under reduced pressure to remove the solvent and other volatile impurities, obtaining 100g of caster catalyst, which is then diluted to 5000ppm for the next step.

[0064] Step 5: Add 20g of caster catalyst (equivalent to 512.8ummol), 5.60g of SG-1E, and 20mL of toluene solution to a three-necked round-bottom flask and react completely at 60℃ under N2. Add isopropanol to the precipitate, stir and mix, filter, wash the precipitate three times with isopropanol, concentrate and dry under vacuum to obtain 5.5g of the target product SG-2E.

[0065] Comparative Example 1:

[0066] The preparation process is similar to that in Example 1, except that step (3) is omitted and S2 obtained in step 2 is directly exchanged with the cassiterite catalyst to prepare S2-2A'.

[0067] Comparative Example 2:

[0068] The preparation process is similar to that in Example 4, except that step (3) is omitted and S2 obtained in step 2 is directly exchanged with the cassiterite catalyst to prepare S2-2D'.

[0069] a. Testing of high-temperature vulcanization performance

[0070] Take 100g of methyl vinyl solid silicone rubber HS-2161 (Hesheng Silicon Industry Co., Ltd.), add 2.4g of hydrogen-containing silicone oil (hydrogen content 0.75%) and 5g of the catalysts SG-2A, SG-2B, SG-2C, SG-2D, SG-2E, SG-2A', and SG-2D' prepared above, and roll them in a triangular shape 10 times in a two-roll mill to obtain the final rubber compound. Then, vulcanize and mold it at a temperature of 160℃ for 3 minutes to obtain silicone rubber samples A, B, C, D, E, A', and D'.

[0071] Table 1 below shows the vulcanization results of silicone rubber samples A, B, C, D, E, A', and D' prepared in the examples and comparative examples.

[0072] Table 1. High-temperature catalysis results of examples and comparative examples.

[0073]

[0074] As shown in Table 1, the catalysts SG-2A, SG-2B, SG-2C, SG-2D, and SG-2E prepared in Examples 1, 2, 3, 4, and 5 have similar vulcanization effects on high-temperature catalytic silicone rubber compositions to those catalysts SG-2A' and SG-2D' prepared in Comparative Examples 1 and 2, and do not affect the vulcanization performance.

[0075] b. Flame retardant performance test

[0076] The flame retardancy rating of silicone rubber samples containing the single-component platinum flame retardant used in the examples and comparative examples was determined using the UL94 standard.

[0077] Take 100g of methyl vinyl silicone rubber HS-2161 (Hesheng Silicon Industry Co., Ltd.), add 2.4g of hydrogen-containing silicone oil (hydrogen content 0.75%), and 5g of the catalysts SG-2A, SG-2B, SG-2C, SG-2D, SG-2E, SG-2A', and SG-2D' prepared above, and knead them in a triangular shape 10 times to obtain the final rubber compound. Then, vulcanize and mold it at a temperature of 160℃ for 3 minutes to obtain silicone rubber samples A, B, C, D, E, A', and D', with a thickness of 2mm.

[0078] The flame retardant performance testing standard is as follows:

[0079] Limiting oxygen index is tested according to GB / T 10707-2008;

[0080] Vertical burning performance (i.e., flame retardancy rating) shall be tested in accordance with GB / T13488-2008;

[0081] Table 2 below shows the flame retardant test results of silicone rubber samples A, B, C, D, E, A', and D' prepared with the catalysts prepared in the examples and comparative examples.

[0082] Table 2 Flame retardant test results for A, B, C, D, E, A', and D'

[0083] Sample Limiting oxygen index Vertical combustion performance A 30.9％ UL94V-0 B 30.3％ UL94V-0 C 29.8％ UL94V-1 D 30.5％ UL94V-0 E 30.0％ UL94V-0 A’ 25％ UL94V-2 D’ 23％ UL94V-2

[0084] As shown in Table 2, the catalysts SG-2A, SG-2B, SG-2C, SG-2D, and SG-2E prepared in Examples 1, 2, 3, 4, and 5 can achieve UL94V-0 and UL94V-1 flame retardant ratings, respectively, while the catalysts SG-2A' and SG-2D' prepared in the comparative examples can only achieve UL94V-2 ratings.

[0085] Based on the above, the synthesis of the phosphine-modified silane coupling agent and the ligand exchange process in this invention are specifically as follows: Figure 1 As shown.

[0086] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for preparing a platinum flame retardant for silicone rubber, characterized in that, The specific steps are as follows: Step 1, Synthesis of S1: 2-Allylphenol compounds were dissolved in an organic solvent, and a base was slowly added at 0°C while stirring at 0°C for 30 min. PCl3 was then added, and the reaction was heated for three hours. After monitoring the reaction to ensure completion, the product was quenched, cooled, and filtered to obtain the target product S1, as shown in the following structural formula: ； Step 2, Synthesis of S2: The synthesis of S2 includes the following methods: Method 1: Add S1 and silane coupling agent SM1 to an organic solvent, then add AIBN, heat and react for three hours. After monitoring the reaction of the raw materials, cool, filter, and wash with alcohol to obtain the target product S2; the silane coupling agent SM1 is one or a mixture of 3-mercaptopropyltriethoxysilane, mercaptopropyltrimethoxysilane, and 2-mercaptoethyltriethoxysilane. Method 2: Add S1 and alkoxysilane SM2 to an organic solvent, then add a caster catalyst, heat the mixture for two hours, monitor the reaction until the reactants have reacted, and after cooling, filtration, and washing with alcohol, the target product S2 can be obtained; the alkoxysilane SM2 is one or more of trimethoxysilane and triethoxysilane; Step 3, Synthesis of SG-1: Take the dried aluminum hydroxide powder, put it into a universal pulverizer, add S2, and pulverize it in the pulverizer for ten minutes to obtain silane coupling agent modified aluminum hydroxide SG-1. Step 4, synthesis of the Castel catalyst: chloroplatinic acid, isopropanol, sodium bicarbonate and 1,3-divinyltetramethyldisiloxane are added to a reaction vessel and reacted at 70°C for one hour. The mixture is then filtered and concentrated under reduced pressure to obtain the Castel catalyst. Step 5, Synthesis of SG-2: Castella catalyst, SG-1 and organic solvent are added to a flask and stirred under N2. The reaction is then monitored using GCMS. After that, alcohol is added to the precipitate, and the mixture is stirred, filtered, and the precipitate is washed with alcohol before drying to obtain the target product SG-2.

2. The method for preparing a platinum flame retardant for silicone rubber according to claim 1, characterized in that, The 2-allylphenol compounds refer to a class of compounds with the following structural formula: R1 is an alkyl group containing 1 to 6 carbon atoms.

3. The method for preparing a platinum flame retardant for silicone rubber according to claim 1, characterized in that, The organic solvent is one or more of toluene, tetrahydrofuran, N,N-dimethylformamide, dichloromethane, and petroleum ether.

4. The method for preparing a platinum flame retardant for silicone rubber according to claim 1, characterized in that, The alkali is one or more of sodium hydride, triethylamine, sodium carbonate, sodium bicarbonate, sodium hydroxide, and potassium hydroxide.

5. The method for preparing a platinum flame retardant for silicone rubber according to claim 1, characterized in that, The heating temperature in step one is 50-90℃, and the heating temperature in step two is 50-90℃.

6. The method for preparing a platinum flame retardant for silicone rubber according to claim 1, characterized in that, The alcohol is one or a mixture of methanol, ethanol, and isopropanol.

7. The platinum flame retardant for silicone rubber is prepared by any one of claims 1-6.

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