A polysiloxane, a method for preparing the same, and an application thereof

Abstract

The application discloses a polysiloxane and a preparation method and application thereof, and belongs to the technical field of chemical industry.The polysiloxane has a structure shown in formula I, and the polysiloxane is used as a flame retardant of polycarbonate material, high flame retardant performance can be realized through low addition amount, and the polycarbonate material has excellent performance in oxygen index, vertical combustion and cone calorimetry test.The impact strength of the polycarbonate material containing the polysiloxane flame retardant prepared by the application is greater than that of common polycarbonate material, and the polycarbonate material has better impact resistance, which provides a new idea for developing polycarbonate material with high flame retardance, low heat release and excellent mechanical properties.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chemical technology, and in particular to a polysiloxane and a preparation method and application thereof. BACKGROUND

[0002] Polycarbonate (PC) is one of the five engineering plastics, and bisphenol A polycarbonate (BPA-polycarbonate, hereinafter referred to as polycarbonate) is the most widely used in commerce. The polycarbonate has excellent comprehensive performance, balanced mechanical properties, good dimensional stability, easy coloring, excellent aging resistance and electrical insulation, and is widely used in electronics, electrical appliances, aerospace, machinery, automobile textiles, light industry and building industry. Compared with ordinary thermoplastic resins, the flame retardant performance of polycarbonate itself is better, the UL-94 vertical burning can reach V2 level, and the limiting oxygen index (LOI) can reach about 26%, but it still needs to further add flame retardant to improve its flame retardant property for application in the fields of automobile, household appliance, rail transit interior decoration, etc. However, most PC flame retardants are difficult to achieve a large reduction in heat release at a low addition amount, and PC is prone to dripping during combustion. The existing flame retardant system often adds fluorine-containing anti-dripping agent such as polytetrafluoroethylene, which is a permanent chemical product and has great harm to human body and environment. At the same time, the combustion of the material will release a large amount of heat and toxic smoke, which will also endanger the safety of personnel. Therefore, it is urgent to develop a PC material with high flame retardancy, low heat release and low smoke density. It is challenging to improve the flame retardant performance without affecting the mechanical properties, especially the impact resistance.

[0003] At present, the halogen-free flame retardant of PC mainly includes sulfonate flame retardant, phosphate flame retardant and silicon-based flame retardant. A small amount of sulfonate added in polycarbonate can achieve good flame retardant effect. The commonly used sulfonate flame retardant in industry includes sodium 2,4,5-trichlorobenzenesulfonate, potassium perfluorobutyl sulfonate and potassium benzenesulfonyl sulfonate. Among them, potassium benzenesulfonyl sulfonate is widely used, which is halogen-free, environmentally friendly and economical. The oxygen index of polycarbonate can be increased from 25.2% to 36.1% by adding 0.1% of KSS. The problem of sulfonate flame retardant is that the price is expensive, the addition amount is small and it is not easy to disperse uniformly, and the heat release reduction effect is not ideal when using the flame retardant alone. Bisphenol A bis(diphenyl phosphate) and resorcinol (diphenyl phosphate) are the main phosphoric acid ester flame retardants, but phosphoric acid ester can reduce the heat distortion temperature of polycarbonate material, and some have poor hydrolytic stability.

[0004] Silicone flame retardants have excellent flame retardant properties, good processing performance, environmental friendliness and other characteristics, and therefore have attracted extensive attention. However, it is difficult to achieve good flame retardant effect of polymers by using silicone flame retardants alone. Literature [Fire Science, 2021, 30, 80] prepared PC composite by compounding commercial silicone flame retardant with anti-dripping agent. PC reached V-0 level after adding 3wt% of silicone flame retardant, LOI increased to 34.5%, the peak value of heat release rate decreased by 58.86%, and the peak values of smoke and CO2 release rate decreased by 34.10% and 68.05% respectively, but the anti-dripping agent contains fluorine, which is harmful to the environment and human body. Literature [Chemical Industry and Engineering, 2012, 63, 3365] prepared polyborosiloxane flame retardant by using dimethyldimethoxysilane and diphenyldimethoxysilane as raw materials by two-step synthesis method. The limiting oxygen index of PC increased from 26% to 39.4% after adding 5% (mass fraction) of the flame retardant. Patent CN105670259 discloses a polyborosiloxane flame retardant. The borosiloxane intermediate is first generated by reacting triethoxyborane, silicon tetrachloride, metallocene catalyst and co-catalyst, and then the hydrolysis product of the reaction of the polyborosiloxane intermediate with tetrachlorosilane and water is washed and small molecules are removed to obtain the polyborosiloxane. The PC composite material added with only 0.5 parts of the polyborosiloxane can reach V-0 level of 1.6 mm, the oxygen index reaches 35.6%, and the tensile properties, bending properties, impact properties and transparency of the composite material are not affected, but the above two works do not investigate the effect of the flame retardant on the heat release of the PC composite material.

[0005] In summary, without adding fluorine-containing anti-dripping agent, it is difficult to simultaneously achieve excellent performance of PC in oxygen index, vertical burning, cone calorimetry and mechanical property test. SUMMARY

[0006] Therefore, the technical problem to be solved by the present application is to provide a polysiloxane and a preparation method and application thereof. The polysiloxane can achieve high flame retardant performance by low addition amount, and the mechanical properties of the material are not affected, and excellent performance is achieved in oxygen index, vertical burning, cone calorimetry test.

[0007] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0008] The present application provides a polysiloxane having the structure shown in formula I:

[0009]

[0010] wherein x and y are the degree of polymerization.

[0011] Preferably, x is selected from 100 to 2000.

[0012] Preferably, y is selected from 25 to 300.

[0013] m is selected from 0 or 1;

[0014] R is

[0015] R1 is a substituted or unsubstituted aryl group;

[0016] A is a substituted or unsubstituted aryl group;

[0017] Preferably, the substituent of the substituted aryl is selected from substituted or unsubstituted C1-C4 straight chain or branched alkyl, C1-C 18 One or more of alkoxy, cyano, nitro, and potassium sulfonate groups.

[0018] Preferably, the aryl group is selected from phenyl and / or naphthyl.

[0019] The C1-C4 straight-chain or branched alkyl group specifically includes, but is not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl, etc. Preferably, the C1-C4 straight-chain or branched alkyl group is selected from one or more of methyl, ethyl, and n-propyl.

[0020] The C1~C 18 The alkoxy group is preferably a C1-C3 alkoxy group, specifically including but not limited to methoxy, ethoxy, n-propoxy, isopropoxy and the like.

[0021] G in the above formula I is selected from one or more of hydrogen, methyl, ethyl, vinyl, and phenyl.

[0022] The polysiloxanes of the present invention include but are not limited to any one of the structures shown in formulas a to j:

[0023]

[0024] The present invention also provides a method for preparing polysiloxane, comprising the following steps:

[0025] 1) mixing cyclosiloxane and aminosiloxane uniformly, reacting with water and a ring-opening catalyst, and then removing the solvent to cause a polycondensation reaction to prepare an aminosilicone oil;

[0026] 2) reacting the amino silicone oil prepared in step 1) with aromatic anhydride or aromatic formaldehyde to prepare polysiloxane;

[0027] The amino silicone oil has the structure shown in Formula II:

[0028]

[0029] The x and y are the degrees of polymerization.

[0030] Preferably, x is selected from 100 to 2000.

[0031] Preferably, y is selected from 25 to 300.

[0032] Preferably, R2 is selected from 3-aminopropyl or N-aminoethyl-3-aminopropyl.

[0033] In the present invention, when the amino silicone oil reacts with an aromatic formaldehyde, a polysiloxane containing a Schiff base structure (containing imine or azomethine) is prepared. Preferably, the aromatic formaldehyde has any of the structures shown in Formulas 1-3:

[0034]

[0035] When the amino silicone oil reacts with the aromatic acid anhydride, a polysiloxane containing an acid anhydride structure is prepared.

[0036] Preferably, the aromatic anhydride has a structure shown in Formula 4 or Formula 5:

[0037]

[0038] Among them, R1-R 14 are independently selected from hydrogen or non-hydrogen substituents.

[0039] The non-hydrogen substituent is selected from substituted or unsubstituted C1-C4 straight chain or branched alkyl, C1-C 18 One or more of alkoxy, cyano, nitro, and potassium sulfonate groups.

[0040] The substituted or unsubstituted C1-C4 straight chain or branched alkyl, C1-C 18 The preferred range of the alkoxy group is the same as above and will not be repeated here.

[0041] Preferably, the cyclosiloxane in step 1) is selected from one or more of hexamethylcyclotrisiloxane, hexaphenylcyclotrisiloxane, trimethyl-1,3,5-triphenylcyclotrisiloxane, 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane, hexaethylcyclotrisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, octaphenylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetraphenylcyclotetrasiloxane, and decamethylcyclopentasiloxane; more preferably, hexamethylcyclotrisiloxane, hexaphenylcyclotrisiloxane, hexaethylcyclotrisiloxane, octamethylcyclotetrasiloxane, and 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane; and further preferably, octamethylcyclotetrasiloxane.

[0042] Preferably, the amino siloxane in step 1) is selected from one or more of 3- aminopropylmethyldiethoxysilane, 3-aminopropylmethyldimethoxysilane, N- aminoethyl-3-aminopropylmethyldimethoxysilane, N-aminoethyl-3- aminopropylmethyldiethoxysilane; more preferably 3-aminopropylmethyldiethoxysilane or N-aminoethyl-3-aminopropylmethyldiethoxysilane, and further preferably 3-aminopropylmethyldiethoxysilane.

[0043] Preferably, the ring-opening catalyst in step 1) is selected from one or more of tetramethylammonium hydroxide, cesium hydroxide, sodium hydroxide, potassium hydroxide; more preferably tetramethylammonium hydroxide or sodium hydroxide. In some embodiments of the present application, the ring-opening catalyst is selected from tetramethylammonium hydroxide.

[0044] Preferably, the ring-opening catalyst is 0.02wt% to 10wt% of the cyclic siloxane; more preferably 0.06wt% to 6wt%; and further preferably 0.08wt% to 4wt%. In some embodiments of the present application, the ring-opening catalyst is 0.08wt% of the cyclic siloxane.

[0045] Preferably, a co-catalyst is added in step 1) to facilitate the reaction.

[0046] The co-catalyst is selected from dimethyl sulfoxide.

[0047] The co-catalyst is added in an amount of 0 to 30 times the weight of the ring- opening catalyst.

[0048] The co-catalyst is 0 to 0.5 times the epoxy silane.

[0049] Preferably, the molar ratio of the cyclic siloxane to the amino siloxane is 1:(0.16 to 3.33); more preferably 1:(0.2 to 2.67); and further preferably 1:(0.2 to 0.45). In some embodiments of the present application, the molar ratio of the cyclic siloxane to the amino siloxane is preferably 1:0.2 or 1:0.45 or 1:2.67.

[0050] Preferably, the molar ratio of the water to the amino siloxane is (1 to 3):1; more preferably (2 to 3):1. In some embodiments of the present application, the molar ratio of the water to the amino siloxane is preferably 2:1.

[0051] Preferably, the molar ratio of the amino silicone oil to the aromatic anhydride is 1:(1 to 5); more preferably 1:(1 to 2); and further preferably 1:1.

[0052] Preferably, the molar ratio of the amino silicone oil to the aromatic formaldehyde is 1:(1-5). More preferably, it is 1:(1-2); further preferably, it is 1:1.

[0053] The present application also provides the use of the above-mentioned polysiloxane or the polysiloxane prepared by the above-mentioned preparation method as a polycarbonate flame retardant.

[0054] The present application also provides a polycarbonate material comprising polycarbonate and a flame retardant.

[0055] Preferably, the flame retardant is the above-mentioned polysiloxane or the polysiloxane prepared by the above-mentioned preparation method.

[0056] Preferably, the mass percentage content of the polycarbonate and the polysiloxane is:

[0057] Polycarbonate: 90%-99%;

[0058] Polysiloxane: 1%-10%.

[0059] Preferably, the content of the polycarbonate in the polycarbonate material is preferably 90wt%, 95wt%, 98wt% or 99wt%.

[0060] Preferably, the content of the polysiloxane in the polycarbonate material is preferably 1wt%, 2wt%, 5wt% or 10wt%.

[0061] Preferably, the polycarbonate material comprises the following components:

[0062] Polycarbonate: 90wt%;

[0063] The above-mentioned polysiloxane (flame retardant): 10wt%.

[0064] Preferably, the polycarbonate material comprises the following components:

[0065] Polycarbonate: 99wt%;

[0066] The above-mentioned polysiloxane (flame retardant): 1wt%.

[0067] Preferably, the polycarbonate material comprises the following components:

[0068] Polycarbonate: 95wt%;

[0069] The above-mentioned polysiloxane (flame retardant): 5wt%.

[0070] Preferably, the polycarbonate material comprises the following components:

[0071] Polycarbonate: 98wt%;

[0072] The polysiloxane (flame retardant) above: 2 wt%.

[0073] In the present application, the polycarbonate material contains 1 wt% to 10 wt% of polysiloxane as a flame retardant, which can achieve high flame retardant performance and low heat release, and make the polycarbonate material have better impact resistance.

[0074] Compared with the prior art, the polysiloxane provided by the present application has the structure shown in formula I, and the polysiloxane as a flame retardant for polycarbonate material can achieve high flame retardant performance by low addition amount and make the polycarbonate material have excellent performance in oxygen index, vertical burning and cone calorimetry. The impact strength of the polycarbonate material containing the polysiloxane flame retardant prepared by the present application is greater than that of ordinary polycarbonate material, and has better impact resistance, which provides a new idea for developing polycarbonate material with high flame retardancy, low heat release and excellent mechanical properties. BRIEF DESCRIPTION OF DRAWINGS

[0075] Figure 1 The nuclear magnetic resonance hydrogen spectrum of the polysiloxane containing Schiff base prepared for Example 1;

[0076] Figure 2 The nuclear magnetic resonance hydrogen spectrum of the polysiloxane containing Schiff base prepared for Example 2;

[0077] Figure 3 The nuclear magnetic resonance hydrogen spectrum of the polysiloxane containing Schiff base prepared for Example 3;

[0078] Figure 4 The nuclear magnetic resonance hydrogen spectrum of the polysiloxane containing Schiff base prepared for Example 6;

[0079] Figure 5 The nuclear magnetic resonance hydrogen spectrum of the polysiloxane containing Schiff base prepared for Example 7;

[0080] Figure 6 The nuclear magnetic resonance hydrogen spectrum of the polysiloxane containing naphthalene anhydride prepared for Example 8;

[0081] Figure 7 The nuclear magnetic resonance hydrogen spectrum of the polysiloxane containing naphthalene anhydride prepared for Example 9;

[0082] Figure 8 The nuclear magnetic resonance hydrogen spectrum of the polysiloxane containing naphthalene anhydride prepared for Example 10. DETAILED DESCRIPTION

[0083] In order to further illustrate the present application, the polysiloxane provided by the present application and the preparation method and application thereof are described in detail below in combination with examples.

[0084] The following reaction materials and solvents are all ordinary commercially available products, purchased from Adamas Reagent Co., Ltd.

[0085] Example 1

[0086] (1) Preparation of amino silicone oil

[0087] Into a reactor, 29.7 grams of octamethylcyclotetrasiloxane and 3.8 grams of 3- aminopropylmethyldiethoxysilane were stirred uniformly, then 0.72 grams of water, 0.018 grams of tetramethylammonium hydroxide pentahydrate and 0.36 grams of dimethyl sulfoxide were added, and the mixture was reacted at 100°C for 4 hours. Then, small molecules were removed by distillation under reduced pressure, and the condensation reaction was continued at 120°C for 24 hours. After the reaction was completed, the temperature was raised to 150°C, and the catalyst was deactivated and small molecule products were removed under reduced pressure for 0.5 hours to obtain amino silicone oil, with a yield of 87%.

[0088] Figure 1 NMR hydrogen spectrum of the Schiff base-containing polysiloxane prepared in Example 1.

[0089] (2) Preparation of polysiloxane

[0090] Into a reactor, 15.2 grams of the prepared amino silicone oil and 1.96 grams of trimethoxybenzaldehyde were dissolved in 10 milliliters of tetrahydrofuran, and then refluxed at 80°C for 12 hours. The solvent was removed by distillation under reduced pressure to obtain Schiff base-containing polysiloxane, with a yield of 95%.

[0091] (3) Preparation of polycarbonate material

[0092] Into a reactor, 10 grams of the prepared polysiloxane were added to 490 grams of polycarbonate to prepare a polycarbonate material, wherein the mass content of the polysiloxane was 2wt%, and the content of the polycarbonate was 98wt%.

[0093] Example 2

[0094] The specific operation was the same as in Example 1, except that 8.6 grams of 3- aminopropylmethyldiethoxysilane described in step (1) of Example 1 was used, 1.62 grams of water was used, 0.02 grams of tetramethylammonium hydroxide pentahydrate and 0.4 grams of dimethyl sulfoxide were used, and the yield of the obtained amino silicone oil was 86%. 7.8 grams of the amino silicone oil described in step (2) of Example 1 was used, and the yield of the obtained polysiloxane was 94%. Figure 2 NMR hydrogen spectrum of the Schiff base-containing polysiloxane prepared in Example 2.

[0095] Example 3

[0096] The procedure is the same as Example 1 except that 3-aminopropylmethyldiethoxysilane described in step (1) of Example 1 is charged at 51 grams, water is charged at 9.6 grams, and tetramethylammonium hydroxide pentahydrate and dimethylsulfoxide are charged at 0.05 grams and 0.8 grams, respectively, and the yield of the aminosilicone oil is 85%. The aminosilicone oil described in step (2) of Example is charged at 2.3 grams, and the yield of the polysiloxane is 92%. Figure 3 The proton nuclear magnetic resonance spectrum of the Schiff base-containing polysiloxane prepared in Example 3 is shown in Figure 3.

[0097] Example 4

[0098] The procedure is the same as Example 2 except that the content of the polysiloxane in the polycarbonate material described in step (3) is 10 wt%, and the content of the polycarbonate is 90 wt%.

[0099] Example 5

[0100] The procedure is the same as Example 2 except that the content of the polysiloxane in the polycarbonate material described in step (3) is 1 wt%, and the content of the polycarbonate is 99 wt%.

[0101] Example 6

[0102] The procedure is the same as Example 2 except that the trimethoxybenzaldehyde described in step (2) is replaced with dimethoxybenzaldehyde, and the amount charged is 1.7 grams, and the yield of the polysiloxane is 93%. Figure 4 The proton nuclear magnetic resonance spectrum of the Schiff base-containing polysiloxane prepared in Example 6 is shown in Figure 6.

[0103] Example 7

[0104] The procedure is the same as Example 2 except that the trimethoxybenzaldehyde described in step (2) is replaced with cyanobenzaldehyde, and the amount charged is 1.3 grams, and the yield of the polysiloxane is 92%. Figure 5 The proton nuclear magnetic resonance spectrum of the Schiff base-containing polysiloxane prepared in Example 7 is shown in Figure 7.

[0105] Example 8

[0106] The procedure is the same as Example 2 except that the trimethoxybenzaldehyde described in step (2) is replaced with 1,8-naphthalic anhydride, and the amount charged is 2 grams, and the yield of the polysiloxane is 90%. Figure 6 The proton nuclear magnetic resonance spectrum of the naphthalic anhydride-containing polysiloxane prepared in Example 8 is shown in Figure 8.

[0107] Example 9

[0108] The procedure was the same as in Example 3, except that the trimethoxyl benzaldehyde in step (2) was replaced by 1,8-naphthalic anhydride, and the amount of 1,8-naphthalic anhydride was 2 g. The yield of polysiloxane was 91%. Figure 7 The hydrogen nuclear magnetic resonance spectrum of the polysiloxane containing naphthalic anhydride prepared in Example 9 was obtained.

[0109] Example 10

[0110] The procedure was the same as in Example 8, except that the 1,8-naphthalic anhydride in step (2) was replaced by phthalic anhydride, and the amount of phthalic anhydride was 1.48 g. The yield of polysiloxane was 93%. And the content of polysiloxane in the polycarbonate material in step (3) was 5 wt%, and the content of polycarbonate was 95 wt%. Figure 8 The hydrogen nuclear magnetic resonance spectrum of the polysiloxane containing phthalic anhydride prepared in Example 10 was obtained.

[0111] Comparative Example 1

[0112] Commercial polycarbonate material, model PC2805, manufacturer Bayer Chemical.

[0113] The performance tests of the polycarbonate materials in Examples 1-10 above and the commercial polycarbonate in Comparative Example 1 were carried out, and the results are shown in Table 1.

[0114] Table 1 Performance test results of Examples 1-10 and Comparative Example 1

[0115]

[0116]

[0117] Note: PHRR is the maximum heat release rate, THR is the total heat release, MARHE is the maximum average heat release rate, and the side group refers to the substituent group in the aromatic anhydride or aromatic aldehyde.

[0118] The calculation formula of the side group content is as follows:

[0119] Side group content (mol%) = y / (4x+y)

[0120] Wherein, x is the number of moles of octamethylcyclotetrasiloxane, and y is the number of moles of 3-aminopropylmethyldiethoxysilane.

[0121] The vertical burning test was carried out according to the UL-94 standard, the limiting oxygen index LOI (%) was tested according to ASTM D2863, the Izod notched impact was tested according to GB1843-96, and the heat release rate was tested according to ISO 5660-1, with a measurement power of 35 kw / m 2 .

[0122] In summary, the polysiloxane as the flame retardant in the present application can achieve high flame retardant performance by low addition amount, and meanwhile has excellent performance in oxygen index, vertical burning and cone calorimeter test. Among them, the oxygen index is significantly improved, the flame retardant effect is better, the maximum heat release rate is reduced by 42%-77%, the total heat release is reduced by 7%-39%, the maximum average heat release rate is also significantly reduced, and the impact strength of the polycarbonate material containing the polysiloxane flame retardant prepared by the present application is greater than that of ordinary polycarbonate material, and has better impact resistance, which provides a train of thought for developing new polycarbonate materials with high flame retardancy, low heat release and excellent mechanical properties.

[0123] The above examples are only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A polysiloxane, characterized in that Having the structure shown in formula I: ； Formula I; Where x and y are the degrees of polymerization; m is selected from 0 or 1; R is 、 or ; R1 is a substituted aryl group, the substituent of the substituted aryl group is selected from C1~C 18 One or more of alkoxy and cyano groups; A is a substituted or unsubstituted aryl group, wherein the aryl group is selected from phenyl and / or naphthyl; G is selected from one or more of hydrogen, methyl, ethyl, vinyl, and phenyl.

2. The polysiloxane according to claim 1, wherein When A is a substituted aryl group, the substituent is selected from substituted or unsubstituted C1~C4 straight chain or branched alkyl, C1~C 18 One or more of alkoxy, cyano, nitro, and potassium sulfonate groups.

3. The polysiloxane according to claim 1, wherein The R1 is a substituted aryl group, and the aryl group is selected from phenyl and / or naphthyl.

4. A method for preparing polysiloxane, characterized in that: The following steps are involved: 1) Cyclosiloxane and aminosiloxane are uniformly mixed and reacted with water and a ring-opening catalyst, and then the solvent is removed to cause a polycondensation reaction to prepare an aminosilicone oil; 2) reacting the amino silicone oil prepared in step 1) with aromatic anhydride or aromatic formaldehyde to prepare polysiloxane; The amino silicone oil has the structure shown in Formula II: ； Formula II; The x and y are the degrees of polymerization; Said R2 is selected from 3-aminopropyl or N-aminoethyl-3-aminopropyl; The aromatic formaldehyde has any structure shown in Formula 1-3: ； The aromatic anhydride has a structure shown in Formula 4 or Formula 5: ； Wherein, R1-R6 are independently selected from hydrogen, C1~C 18 Alkoxy or cyano, R1-R6 are not hydrogen, R7-R 14 are independently selected from hydrogen or non-hydrogen substituents.

5. The preparation method according to claim 4, characterized in that The non-hydrogen substituent is selected from substituted or unsubstituted C1~C4 straight chain or branched alkyl, C1~C 18 One or more of alkoxy, cyano, nitro, and potassium sulfonate groups.

6. The preparation method according to claim 4, characterized in that The cyclosiloxane in step 1) is selected from one or more of hexamethylcyclotrisiloxane, hexaphenylcyclotrisiloxane, trimethyl-1,3,5-triphenylcyclotrisiloxane, 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane, hexaethylcyclotrisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, octaphenylcyclotetrasiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetraphenylcyclotetrasiloxane, and decamethylcyclopentasiloxane.

7. The preparation method according to claim 4, characterized in that The aminosiloxane in step 1) is selected from one or more of 3-aminopropylmethyldiethoxysilane, 3-aminopropylmethyldimethoxysilane, N-aminoethyl-3-aminopropylmethyldimethoxysilane, and N-aminoethyl-3-aminopropylmethyldiethoxysilane; The ring-opening catalyst in step 1) is selected from one or more of tetramethylammonium hydroxide, cesium hydroxide, sodium hydroxide, and potassium hydroxide.

8. The preparation method according to claim 4, characterized in that The ring-opening catalyst is 0.02 wt% to 10 wt% of the cyclosiloxane; The molar ratio of the cyclosiloxane to the aminosiloxane is 1:(0.16-3.33); The molar ratio of water to aminosilicone is (1-3):1; The molar ratio of the amino silicone oil to the aromatic anhydride is 1:(1-5); The molar ratio of the amino silicone oil to the aromatic formaldehyde is 1:(1-5).

9. Use of the polysiloxane according to any one of claims 1 to 3 or the polysiloxane prepared by the preparation method according to any one of claims 4 to 8 as a polycarbonate flame retardant.

10. A polycarbonate material, characterized in that: Includes polycarbonate and flame retardant; The flame retardant is the polysiloxane according to any one of claims 1 to 3 or the polysiloxane prepared by the preparation method according to any one of claims 4 to 8; The mass percentages of the polycarbonate and polysiloxane are: Polycarbonate: 90% to 99%; Polysiloxane: 1%~10%.

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