High-temperature-resistant flame-retardant PVC (polyvinyl chloride) material and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant flame-retardant PVC (polyvinyl chloride) material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The PVC material is prepared from the following components: 8 to 12 weight percent of ABS (Acrylonitrile Butadiene Styrene) resin, 5.2 to 6.5 weight percent of temperature-resistant modified flame retardant, 1.8 to 2.3 weight percent of intumescent synergistic flame retardant, 20 to 25 weight percent of plasticizer, 1.3 to 1.6 weight percent of heat stabilizer, 2.4 to 2.8 weight percent of lubricant, 0.1 to 0.12 weight percent of antioxidant and the balance of PVC resin, the temperature-resistant modified flame retardant has a multi-branched-chain structure and good migration resistance, a multi-benzene-ring structure introduced on a branched-chain side chain and a chlorine group on a PVC macromolecular side chain form dipole-dipole interaction, the material is strengthened, meanwhile, a DOPO functional structure is anchored, migration is not prone to occurring at the high temperature, and the stable flame retardant effect is achieved; and the problem of mechanical property deterioration caused by internal defects formed by migration is relieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer composite materials, and specifically relates to a high-temperature resistant and flame-retardant PVC material and a preparation method thereof. Background Art

[0002] Polyvinyl chloride (PVC), as an important general-purpose plastic, is widely used in fields such as construction, wire and cable, and automotive interiors due to its excellent mechanical properties, chemical corrosion resistance, and cost advantages. However, the limiting oxygen index of PVC material itself is relatively low, and it is prone to combustion and release of toxic fumes in high-temperature or open-fire environments. Therefore, flame-retardant modification has become a key technical requirement for its application in high-safety scenarios.

[0003] Traditional flame-retardant technologies are mainly divided into two categories: inorganic flame-retardant systems and organic flame-retardant systems. Inorganic flame retardants (such as aluminum hydroxide, magnesium hydroxide, zinc borate, etc.) achieve flame retardancy through mechanisms such as endothermic decomposition and release of crystal water, and have the advantages of high thermal stability, smokeless and non-toxic. However, such flame retardants need to be added in high doses (usually ≥50 phr) to meet the flame-retardant standards, resulting in a significant increase in the hardness of the material and deterioration of flexibility, making it difficult to meet the mechanical property requirements of soft PVC products (such as cable sheaths, flexible films). In addition, excessive filling will also cause problems such as a decrease in processing fluidity and surface roughness.

[0004] In contrast, although organic flame retardants can achieve high-efficiency flame retardancy with a low addition amount and have less impact on the flexibility of the material, they have inherent defects in thermal stability. In the PVC processing or high-temperature use environment, organic flame retardants are prone to physical migration or thermal decomposition, resulting in uneven distribution of flame-retardant components inside the material. Especially in actual fire scenarios, during the heat-softening stage of PVC, the flame retardant escapes and migrates, forming weak areas with insufficient local flame retardant concentration, which instead accelerates the thermal decomposition of the material and reduces the ignition threshold. In addition, some organic flame retardants will also increase the smoke generation amount during combustion or release corrosive gases such as hydrogen halide, causing secondary hazards.

[0005] In summary, developing a flame-retardant system that combines low addition amount, high flame-retardant efficiency, excellent migration resistance, and does not affect the flexibility of PVC has become an important direction to break through the current technical bottleneck, especially for expanding the application of soft flame-retardant PVC materials in high-temperature and harsh environments, which has an urgent significance. Summary of the Invention

[0006] In order to solve the technical problems mentioned in the background art, the purpose of the present invention is to provide a high-temperature resistant and flame-retardant PVC material and a preparation method thereof.

[0007] The purpose of the present invention can be achieved by the following technical solutions: A high-temperature resistant and flame-retardant PVC material, whose components are: 8-12 wt% of ABS resin, 5.2-6.5 wt% of temperature-resistant modified flame retardant, 1.8-2.3 wt% of intumescent synergistic flame retardant, 20-25 wt% of plasticizer, 1.3-1.6 wt% of heat stabilizer, 2.4-2.8 wt% of lubricant, and 0.1-0.12 wt% of antioxidant, with the balance being PVC resin.

[0008] The temperature-resistant modified flame retardant is prepared by the following method: Step A1: Mix octaphenylcyclotetrasiloxane and dimethyl sulfoxide, then add 1,6-bis(trimethoxysilyl)hexane, potassium hydroxide and deionized water and mix. Heat up to 80-100 °C and stir for co-hydrolysis for 1-1.5 h. Then vacuum dry to remove water and protect with dry gas. Control the temperature at 30-45 °C and slowly add methylvinyldichlorosilane and stir for reaction for 2.5-3.5 h. After the reaction ends, add ethanol and mix, and rotary evaporate under reduced pressure to remove dimethyl sulfoxide to obtain an organosilicon matrix. Furthermore, the feeding ratio of 1,6-bis(trimethoxysilyl)hexane, octaphenylcyclotetrasiloxane, methylvinyldichlorosilane, potassium hydroxide, deionized water and dimethyl sulfoxide is 1 mmol: 15-18 mmol: 10-12 mmol: 0.1-0.15 g: 15-20 mL: 40-60 mL. 1,6-bis(trimethoxysilyl)hexane and octaphenylcyclotetrasiloxane are co-hydrolyzed, and then methylvinyldichlorosilane is used as an active bridging material for condensation to form a compound with multi-branched vinyl-containing organosilicon chains.

[0009] Step A2: Mix DOPO, the organosilicon matrix, benzoyl peroxide and dimethylformamide, pre-heat to 50-60 °C and stir for activation for 30-50 min. Then continue to heat up to 85-100 °C and stir for reaction for 3-4 h. After the reaction ends, add water for washing, centrifuge to remove the aqueous phase, and dry to obtain the temperature-resistant modified flame retardant. Furthermore, the feeding ratio of the organosilicon matrix, DOPO, benzoyl peroxide and dimethylformamide is 10 g: 8-10 mmol: 0.08-0.11 g: 25-30 mL. Benzoyl peroxide initiates the addition of DOPO to the vinyl group in the organosilicon matrix to introduce DOPO structural modification.

[0010] Preferably, the intumescent synergistic flame retardant is melamine cyanurate, which has a fast decomposition and expansion response at high temperature, quickly forms an expanded void structure in a high-temperature fire, and cooperates with the temperature-resistant modified flame retardant to form a stable flame-retardant and heat-insulating barrier to hinder the deepening of combustion.

[0011] Preferably, the plasticizer is glyceryl trioleate, which has good self-thermal stability and is not easy to migrate in the PVC composite system at high temperature, and can maintain good toughening effect at high temperature.

[0012] Preferably, the heat stabilizer is a calcium-zinc heat stabilizer, which can effectively prevent the degradation of PVC under high-temperature conditions and has a certain internal lubrication effect, facilitating the processing of PVC composite products.

[0013] Preferably, the lubricant is oxidized polyethylene wax, which maintains good lubricity at high temperatures.

[0014] A preparation method of a high-temperature resistant and flame-retardant PVC material is as follows: Mix each component, and plastify and extrude and pelletize through a twin-screw extruder at 180-190 °C to obtain the high-temperature resistant and flame-retardant PVC material.

[0015] The beneficial effects of the present invention: The present invention discloses a temperature-resistant modified flame retardant applicable to the PVC system, which is obtained by co-hydrolyzing 1,6-bis(trimethoxysilyl)hexane and octaphenylcyclotetrasiloxane, and then condensing with methylvinyldichlorosilane as an active bridging material to form a compound with multiple vinyl-containing organosilicon chains. Then, DOPO is added to the vinyl group on the side chain to introduce a DOPO structure with flame-retardant function for modification; compared with the existing organic flame retardants, in terms of molecular structure, the temperature-resistant modified flame retardant has a multi-branched structure, forms molecular entanglement with PVC macromolecules, and has strong temperature-resistant migration ability at high temperatures. In terms of molecular composition, the multi-branched chains are mainly composed of silicon chains, with excellent heat stability, and a multi-benzene ring structure is introduced on its side chain, which forms dipole-dipole interaction with the chlorine groups on the side chains of PVC macromolecules. On the one hand, it strengthens the PVC matrix, and on the other hand, it improves the anchoring strength between the temperature-resistant modified flame retardant and PVC macromolecules, is not easily migrated at high temperatures, plays a stable flame-retardant role, and reduces the problem of deterioration of mechanical properties caused by the formation of internal defects due to migration. In addition, during the combustion process, a multi-layer structure formed by the high-temperature resistant organosilicon chains and PVC macromolecules restricts the molten droplets, reduces the generation of molten droplets, and weakens the secondary disasters caused by the generation of molten droplets. Specific embodiments

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0017] Example 1, preparing a high-temperature resistant and flame-retardant PVC material, and the specific implementation method is as follows: I. Synthesis of the temperature-resistant modified flame retardant a1. Synthesis of organosilicon matrix: octaphenylcyclotetrasiloxane and dimethyl sulfoxide are stirred and mixed, and then 1,6-bistrimethoxysilylhexane, potassium hydroxide and deionized water are added and stirred and mixed evenly, the temperature is raised to 100°C, and co-hydrolyzed at 150 rpm for 1 hour, and then vacuum dried to remove moisture, dry air is introduced for protection, the temperature of the reaction system is controlled at 45°C in a water bath, and methylvinyldichlorosilane is slowly added and stirred for reaction for 2.5 hours, wherein the feed ratio of 1,6-bistrimethoxysilylhexane, octaphenylcyclotetrasiloxane, methylvinyldichlorosilane, potassium hydroxide, deionized water and dimethyl sulfoxide is 1mmol:18mmol:12mmol:0.15g:20mL:60mL. After the reaction is completed, 5wt% ethanol is added to the reaction system for washing, and dimethyl sulfoxide is removed by vacuum rotary evaporation to prepare an organosilicon matrix.

[0018] a2. Synthesis of heat-resistant modified flame retardant: DOPO, silicone matrix, benzoyl peroxide and dimethylformamide were mixed and stirred, preheated to 60°C, stirred at 60rpm for 30min, then continued to heat to 100°C, and increased the stirring rate to 120rpm for 3h. The feed ratio of silicone matrix, DOPO, benzoyl peroxide and dimethylformamide was 10g:10mmol:0.11g:30mL. After the reaction was completed, water 3 times the weight of the reaction system was added for washing, the aqueous phase was removed by centrifugation, and the substrate was dried to obtain a heat-resistant modified flame retardant.

[0019] 2. Preparation of high temperature resistant flame retardant PVC granules b1. Ingredients: Take raw materials according to weight percentage, ABS resin 8wt%, POLYLAC®PA-747 resin raw material; temperature-resistant modified flame retardant 5.2wt%, prepared in this embodiment; intumescent synergistic flame retardant 2.3wt%, XS-MC-151 melamine cyanurate; plasticizer 25wt%, industrial grade triolein; heat stabilizer 1.6wt%, GP-285 calcium zinc heat stabilizer; lubricant 2.8wt%, AC-316A oxidized polyethylene wax; antioxidant 0.1wt%, antioxidant 1010 and antioxidant 168 are used in a weight ratio of 2:1; the remainder is PVC resin, SG-5 type resin raw material is selected.

[0020] b2. Plasticizing: Mix the raw materials of each component at a high speed of 600 rpm for 10 minutes, then add the mixture into a twin-screw extruder, control the temperature of the plasticizing zone to 190°C, extrude and pelletize to obtain a high temperature resistant and flame retardant PVC material.

[0021] Example 2, preparation of high temperature resistant flame retardant PVC material, the specific implementation method is as follows: 1. Synthesis of temperature-resistant modified flame retardant a1. Synthesis of organosilicon matrix: octaphenylcyclotetrasiloxane and dimethyl sulfoxide are stirred and mixed, and then 1,6-bistrimethoxysilylhexane, potassium hydroxide and deionized water are added and stirred and mixed evenly, the temperature is raised to 80°C, and co-hydrolysis is stirred at 120rpm for 1.5h, and then vacuum drying is carried out to remove moisture, dry air is introduced for protection, the temperature of the reaction system is controlled at 30°C in a water bath, and methylvinyldichlorosilane is slowly added and stirred for 3.5h. Among them, the feed ratio of 1,6-bistrimethoxysilylhexane, octaphenylcyclotetrasiloxane, methylvinyldichlorosilane, potassium hydroxide, deionized water and dimethyl sulfoxide is 1mmol:15mmol:10mmol:0.1g:15mL:40mL. After the reaction is completed, 5wt% of ethanol is added to the reaction system for washing, and dimethyl sulfoxide is removed by vacuum rotary evaporation to prepare an organosilicon matrix.

[0022] a2. Synthesis of heat-resistant modified flame retardant: DOPO, silicone matrix, benzoyl peroxide and dimethylformamide were mixed and stirred, preheated to 50°C, stirred at 30rpm for 50min, then continued to heat to 85°C, increased the stirring rate to 90rpm and reacted for 4h, wherein the feed ratio of silicone matrix, DOPO, benzoyl peroxide and dimethylformamide was 10g:8mmol:0.08g:25mL, and after the reaction was completed, water 3 times the weight of the reaction system was added for washing, the aqueous phase was removed by centrifugation, and the substrate was dried to obtain the heat-resistant modified flame retardant.

[0023] 2. Preparation of high temperature resistant flame retardant PVC granules b1. Ingredients: Take raw materials according to weight percentage, ABS resin 12wt%, POLYLAC®PA-747 resin raw material; temperature-resistant modified flame retardant 6.5wt%, prepared in this embodiment; intumescent synergistic flame retardant 1.8wt%, XS-MC-151 melamine cyanurate; plasticizer 20wt%, industrial grade triolein; heat stabilizer 1.3wt%, GP-285 calcium zinc heat stabilizer; lubricant 2.4wt%, AC-316A oxidized polyethylene wax; antioxidant 0.12wt%, antioxidant 1010 and antioxidant 168 are used in a weight ratio of 2:1; the remainder is PVC resin, SG-5 type resin raw material is selected.

[0024] b2. Plasticizing: Mix the raw materials of each component at a high speed of 600 rpm for 10 minutes, then add the mixture into a twin-screw extruder, control the temperature of the plasticizing zone to 180°C, extrude and pelletize to obtain a high temperature resistant and flame retardant PVC material.

[0025] Example 3, preparation of high temperature resistant flame retardant PVC material, the specific implementation method is as follows: 1. Synthesis of temperature-resistant modified flame retardant a1. Synthesis of organosilicon matrix: octaphenylcyclotetrasiloxane and dimethyl sulfoxide are stirred and mixed, and then 1,6-bistrimethoxysilylhexane, potassium hydroxide and deionized water are added and stirred and mixed evenly, the temperature is raised to 90°C, and co-hydrolysis is stirred at 120rpm for 1.3h, and then vacuum drying is carried out to remove moisture, dry air is introduced for protection, the temperature of the reaction system is controlled at 40°C in a water bath, and methylvinyldichlorosilane is slowly added and stirred for reaction for 3h, wherein the feed ratio of 1,6-bistrimethoxysilylhexane, octaphenylcyclotetrasiloxane, methylvinyldichlorosilane, potassium hydroxide, deionized water and dimethyl sulfoxide is 1mmol:16mmol:12mmol:0.13g:18mL:50mL. After the reaction is completed, 5wt% ethanol is added to the reaction system for washing, and dimethyl sulfoxide is removed by vacuum rotary evaporation to prepare an organosilicon matrix.

[0026] a2. Synthesis of heat-resistant modified flame retardant: DOPO, silicone matrix, benzoyl peroxide and dimethylformamide were mixed and stirred, preheated to 55°C, stirred at 30rpm for 40min, then continued to heat to 95°C, increased the stirring rate to 120rpm and reacted for 3.5h, wherein the feed ratio of silicone matrix, DOPO, benzoyl peroxide and dimethylformamide was 10g:10mmol:0.1g:28mL. After the reaction was completed, water 3 times the weight of the reaction system was added for washing, the aqueous phase was removed by centrifugation, and the substrate was dried to obtain the heat-resistant modified flame retardant.

[0027] 2. Preparation of high temperature resistant flame retardant PVC granules b1. Ingredients: Take raw materials according to weight percentage, ABS resin 11wt%, POLYLAC®PA-747 type resin raw material; temperature-resistant modified flame retardant 5.8wt%, prepared in this embodiment; intumescent synergistic flame retardant 2.1wt%, XS-MC-151 type melamine cyanurate; plasticizer 22wt%, industrial grade triolein; heat stabilizer 1.5wt%, GP-285 type calcium zinc heat stabilizer; lubricant 2.6wt%, AC-316A type oxidized polyethylene wax; antioxidant 0.11wt%, antioxidant 1010 and antioxidant 168 are used in a weight ratio of 2:1; the remainder is PVC resin, SG-5 type resin raw material is selected.

[0028] b2. Plasticizing: Mix the raw materials of each component at a high speed of 600 rpm for 10 minutes, then add the mixture into a twin-screw extruder, control the temperature of the plasticizing zone to 190°C, extrude and pelletize to obtain a high temperature resistant and flame retardant PVC material.

[0029] Example 4, preparation of high temperature resistant flame retardant PVC material, the specific implementation method is as follows: 1. Synthesis of temperature-resistant modified flame retardant a1. Synthesis of organosilicon matrix: octaphenylcyclotetrasiloxane and dimethyl sulfoxide were stirred and mixed, and then 1,6-bistrimethoxysilylhexane, potassium hydroxide and deionized water were added and stirred and mixed evenly, the temperature was raised to 80°C, and co-hydrolyzed at 150rpm for 1.5h, and then vacuum dried to remove moisture, and dry air was introduced for protection. The temperature of the reaction system was controlled at 35°C in a water bath, and methylvinyldichlorosilane was slowly added and stirred for 3.2h. Among them, the feed ratio of 1,6-bistrimethoxysilylhexane, octaphenylcyclotetrasiloxane, methylvinyldichlorosilane, potassium hydroxide, deionized water and dimethyl sulfoxide was 1mmol:17mmol:11mmol:0.13g:20mL:55mL. After the reaction was completed, 5wt% of ethanol was added to the reaction system for washing, and dimethyl sulfoxide was removed by vacuum rotary evaporation to prepare an organosilicon matrix.

[0030] a2. Synthesis of heat-resistant modified flame retardant: DOPO, silicone matrix, benzoyl peroxide and dimethylformamide were mixed and stirred, preheated to 560°C, stirred at 60rpm for 40min, then continued to heat to 90°C, increased the stirring rate to 120rpm and reacted for 3.2h, wherein the feed ratio of silicone matrix, DOPO, benzoyl peroxide and dimethylformamide was 10g:10mmol:0.09g:25mL, and after the reaction was completed, water 3 times the weight of the reaction system was added for washing, the aqueous phase was removed by centrifugation, and the substrate was dried to obtain the heat-resistant modified flame retardant.

[0031] 2. Preparation of high temperature resistant flame retardant PVC granules b1. Ingredients: Take raw materials according to weight percentage, ABS resin 10wt%, POLYLAC®PA-747 resin raw material; temperature-resistant modified flame retardant 6wt%, prepared in this embodiment; intumescent synergistic flame retardant 2wt%, XS-MC-151 melamine cyanurate; plasticizer 23wt%, industrial grade triolein; heat stabilizer 1.4wt%, GP-285 calcium zinc heat stabilizer; lubricant 2.6wt%, AC-316A oxidized polyethylene wax; antioxidant 0.11wt%, antioxidant 1010 and antioxidant 168 are used in a weight ratio of 2:1; the remainder is PVC resin, SG-5 type resin raw material is selected.

[0032] b2. Plasticizing: Mix the raw materials of each component at a high speed of 600 rpm for 10 minutes, then add the mixture into a twin-screw extruder, control the temperature of the plasticizing zone to 190°C, extrude and pelletize to obtain a high temperature resistant and flame retardant PVC material.

[0033] Comparative Example 1, referring to Example 4, the temperature-resistant modified flame retardant was replaced with 1 wt % of DOPO and 5 wt % of the organosilicon flame retardant SFR-100, and the rest of the implementation process was exactly the same.

[0034] Comparative Example 2: Referring to Example 4, the temperature-resistant modified flame retardant was replaced with 1 wt% of high-temperature resistant flame retardant LFR-5009 and 5 wt% of silicone flame retardant SFR-100, and the rest of the implementation process was exactly the same.

[0035] Samples were taken from the PVC materials prepared as above and hot-pressed into sheet specimens at 160 °C and 10 MPa in a flat vulcanizing machine. Tensile property tests were carried out with reference to the standard of GB / T 1040.2-2022; oxygen index tests were carried out with reference to the standard of GB / T 2406.2-2009; vertical burning tests were carried out with reference to UL94. The specific test results are shown in Table 1: Table 1 Detection Results of Initial Performance Indexes Tensile strength / MPa Elongation at break / % Oxygen index / % UL94 rating Example 1 21.7 155.8 32.7 V-0 Example 2 26.4 132.9 38.2 V-0 Example 3 24.9 145.3 35.5 V-0 Example 4 24.1 151.7 36.9 V-0 Comparative example 1 16.3 148.9 32.9 V-1 Comparative example 2 15.5 153.0 34.7 V-1 It can be seen from the test results in Table 1 above that the PVC materials prepared in the examples have excellent toughness, and their mechanical properties are significantly better than those of the comparative examples. The limiting oxygen indexes all reach more than 30%, showing a flame-retardant property. In the vertical burning test, there were a small number of unignited molten drops in the comparative examples, and the flame-retardant grade only reached V-1.

[0036] To simulate the flame-retardant state of the PVC materials under high-temperature baking, the above specimens were placed in an oven under a nitrogen atmosphere and baked at 260 °C for 1 h. After cooling, the above tests were carried out again. The specific test results are shown in Table 2: Table 2 Detection Results of Performance Indexes after High-Temperature Baking Tensile strength / MPa Elongation at break / % Oxygen index / % UL94 rating Example 1 20.1 133.5 32.0 V-1 Example 2 23.2 109.5 35.9 V-0 Example 3 22.1 120.6 34.3 V-1 Example 4 21.9 135.3 36.2 V-0 Comparative example 1 10.4 84.9 26.5 V-2 Comparative example 2 11.1 96.4 28.1 V-2 It can be seen from the test results in Table 2 above that the mechanical properties of the PVC materials in the comparative examples deteriorated significantly, the oxygen index decreased, and a large number of molten drops appeared in the vertical burning test. The flame-retardant grade was only V-2.

[0037] In the description of the specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0038] The above content is only an example and illustration of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them. As long as they do not deviate from the invention or exceed the scope defined by the claims of the present invention, they should fall within the protection scope of the present invention.

Claims

1. A high temperature resistant flame retardant PVC material, characterized in that: The composition is: ABS resin 8-12wt%, temperature-resistant modified flame retardant 5.2-6.5wt%, intumescent synergistic flame retardant 1.8-2.3wt%, plasticizer 20-25wt%, heat stabilizer 1.3-1.6wt%, lubricant 2.4-2.8wt% and antioxidant 0.1-0.12wt%, and the balance is PVC resin; The temperature-resistant modified flame retardant is prepared by the following method: Step A1: octaphenylcyclotetrasiloxane and dimethyl sulfoxide are mixed, 1,6-bistrimethoxysilylhexane, potassium hydroxide and deionized water are added, the mixture is heated to 80-100° C. and stirred for co-hydrolysis for 1-1.5 hours, then vacuum dried to remove moisture and protected with dry gas, the temperature is controlled at 30-45° C., methylvinyldichlorosilane is slowly added and stirred for reaction for 2.5-3.5 hours, and ethanol is added after the reaction is completed, and the dimethyl sulfoxide is removed by vacuum rotary evaporation to obtain an organosilicon matrix; Step A2: DOPO, silicone matrix, benzoyl peroxide and dimethylformamide are mixed, preheated to 50-60°C and stirred for activation for 30-50 minutes, then continued to heat to 85-100°C and stirred for reaction for 3-4 hours. After the reaction is completed, water is added for washing, the water phase is removed by centrifugation, and the temperature-resistant modified flame retardant is obtained after drying.

2. A high temperature resistant flame retardant PVC material according to claim 1, characterized in that: The feed ratio of 1,6-bistrimethoxysilylhexane, octaphenylcyclotetrasiloxane, methylvinyldichlorosilane, potassium hydroxide, deionized water and dimethyl sulfoxide is 1 mmol: 15-18 mmol: 10-12 mmol: 0.1-0.15 g: 15-20 mL: 40-60 mL.

3. A high temperature resistant flame retardant PVC material according to claim 2, characterized in that: The feed ratio of the organosilicon matrix, DOPO, benzoyl peroxide and dimethylformamide is 10 g: 8-10 mmol: 0.08-0.11 g: 25-30 mL.

4. The high temperature resistant flame retardant PVC material according to claim 1, characterized in that: The intumescent synergistic flame retardant is melamine cyanurate.

5. The high temperature resistant flame retardant PVC material according to claim 1, characterized in that: The plasticizer is triolein.

6. The high temperature resistant flame retardant PVC material according to claim 1, characterized in that: The heat stabilizer is calcium zinc heat stabilizer.

7. The high temperature resistant flame retardant PVC material according to claim 1, characterized in that: The lubricant is oxidized polyethylene wax.

8. A high temperature resistant flame retardant PVC material according to any one of claims 1 to 7, characterized in that: Specifically, the components are mixed, plasticized and extruded at 180-190°C by a twin-screw extruder, and pelletized to obtain a high temperature resistant and flame retardant PVC material.