Aerogel modified flame retardant gas phase tpe material and its preparation method

Abstract

The application relates to the technical field of high polymer materials, and discloses an aerogel modified gas-phase TPE flame-retardant material, which comprises the following components in parts by weight: TPE 70-90 parts, a flame retardant 10-30 parts, and an antioxidant 0.1-0.5 parts; wherein the flame retardant comprises the following components in parts by weight: aerogel modified diethyl aluminum hypophosphite 30-60 parts, a high-phosphorus polymer 20-50 parts, a synergist 5-20 parts, a surface modifier 0.5-2 parts, and petroleum rubber processing oil 0.5-5 parts; and the preparation method is as follows: the TPE, the flame retardant and the antioxidant are uniformly mixed, are added into a double-screw extruder, the rotating speed of a main machine is controlled to be 350-550 r / min, the processing temperature of a first area is controlled to be 140-180 DEG C, the processing temperatures of other areas are controlled to be 150-200 DEG C, the head temperature is controlled to be 170-200 DEG C, and then melting blending, extrusion granulation are carried out to obtain the aerogel modified gas-phase TPE flame-retardant material. The technical scheme can obtain a TPE flame-retardant material which is excellent in flame-retardant performance, remarkable in heat insulation effect and excellent in mechanical properties, meanwhile, the material cannot appear a melt dripping phenomenon in the use process, and can realize industrialized production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer materials, in particular to a kind of aerogel modified fume TPE flame-retardant material and preparation method thereof. BACKGROUND

[0002] It is a kind of material with high elasticity, high strength, high resilience and injection molding processing characteristics, mainly including thermoplastic polyester elastomer, thermoplastic polyolefin elastomer, thermoplastic dynamic vulcanized rubber, polyether TPU, polyester TPU and thermoplastic rubber. TPE is widely used in many industries such as automobile, electronic and electrical appliances, medical devices, sports equipment, household supplies. However, since TPE is usually composed of multiple polymers, and often contains a large amount of flammable carbon-hydrogen chain structure, there is a great fire hazard in certain circumstances. For example, in the field of electronic and electrical appliances, if ordinary TPE materials are used for wire and cable, electrical appliance shell, socket and other components, when circuit failure, overload or short circuit occurs and produces open flame, TPE will burn quickly, which may cause serious fire and cause irreparable personnel casualties and property losses. Therefore, it is very important to modify TPE for flame retardation.

[0003] At present, the commonly used flame retardants for TPE include halogen-based, nitrogen-phosphorus-based and inorganic-based. Materials containing halogen-based flame retardants will produce a large amount of smoke and toxic corrosive gases during combustion. Many countries, including the European Union, have enacted relevant laws and regulations to control the use of halogen-based flame retardants. Inorganic flame retardants are usually added in large amounts, typically about 50%, which can achieve flame retardation effect, but seriously affect the processing performance and mechanical properties of the material. At present, the phosphorus-nitrogen-based flame retardant in the market still has the phenomenon of melt dripping after being added in large amounts in TPE materials (especially in TPEE and TPU), which can also ignite flammable materials such as cotton, seriously affecting the flame retardant grade and the chain reaction caused during combustion (such as igniting other flammable materials after falling). Therefore, it is an urgent problem to develop a TPE flame-retardant material that does not melt and drip, has high efficiency, good mechanical properties and can be mass produced. SUMMARY

[0004] The present application aims to provide a kind of aerogel modified fume TPE flame-retardant material and preparation method thereof, to obtain a kind of TPE flame-retardant material with excellent flame retardant performance, significant heat insulation effect and excellent mechanical properties, and the material will not appear melt dripping phenomenon during use, and can realize industrial production.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a kind of aerogel modified fume TPE flame-retardant material, comprising the following components by weight fraction: TPE 70-90 parts, flame retardant 10-30 parts, antioxidant 0.1-0.5 parts;

[0006] The flame retardant comprises the following components in parts by weight: aerogel modified diethyl aluminum hypophosphite 30-60 parts, high phosphorus polymer 20-50 parts, synergist 5-20 parts, surface modifier 0.5-2 parts, and petroleum-based rubber processing oil 0.5-5 parts.

[0007] Preferably, the TPE is any one of thermoplastic polyurethane elastomer, thermoplastic polyester elastomer, thermoplastic polyolefin elastomer, thermoplastic dynamically vulcanized rubber, and thermoplastic rubber.

[0008] Preferably, the high phosphorus polymer is any one of polyphosphazene and ammonium polyphosphate.

[0009] Preferably, the aerogel modified diethyl aluminum hypophosphite comprises the following components in parts by weight: amino-silica aerogel powder 2-10 parts and diethyl aluminum hypophosphite 80-100 parts.

[0010] Preferably, the synergist comprises the following components in parts by weight: titanium dioxide 4-15 parts and aluminum oxide 3-10 parts.

[0011] Preferably, the preparation method of the flame retardant comprises the following steps:

[0012] S1: a certain amount of amino-silica aerogel powder and diethyl aluminum hypophosphite are respectively weighed and placed in a high-speed mixer, the rotating speed of the mixer is 500-1500 r / min, and the mixture is stirred at 80-130℃ for 10-30 min;

[0013] S2: high phosphorus polymer, aluminum oxide and titanium dioxide are sequentially added to the high-speed mixer in S1, and then the surface modifier is sprayed during the stirring process;

[0014] S3: after the spraying of the surface modifier is completed, petroleum-based rubber processing oil is added, and the stirring is continued for 12-20 min to obtain the flame retardant.

[0015] Preferably, in S1, the mass ratio of the amino-silica aerogel powder to the diethyl aluminum hypophosphite is 1:(20-30).

[0016] Preferably, in S2, the mass ratio of the ammonium polyphosphate, titanium dioxide and aluminum oxide is (30-40):(12-6):(8-4) in sequence.

[0017] The application also provides another technical solution, a preparation method of aerogel modified gas phase TPE flame-retardant material, TPE, flame retardant and antioxidant are uniformly mixed, and are added into a double screw extruder, the main machine speed is controlled at 350-550 r / min, the first zone processing temperature is 140-180 DEG C, the processing temperature of other zones is 150-200 DEG C, and the die head temperature is 170-200 DEG C, melt blending, extrusion granulation are carried out, and the aerogel modified gas phase TPE flame-retardant material is obtained.

[0018] Preferably, the length-diameter ratio of the extrusion screw is (20-30):1.

[0019] Mechanism of action:

[0020] The technical solution adds the amino-silica aerogel powder, the amino-silica aerogel is a porous network structure material, the porosity is high, the pore size is small, after other components produce non-combustible gas due to combustion, the non-combustible gas can quickly reach the combustion place through the high porosity nano-pores, hinder the combustion process, and reduce the flame propagation speed. Moreover, the thermal conductivity of the amino-silica aerogel is extremely low, the infinitely extended heat conduction path can absorb the heat brought by combustion, reduce the flame temperature, make it difficult to maintain the thermal decomposition temperature, and play a heat insulation protection effect, thereby playing a role in promoting the gas phase.

[0021] The technical solution adds the alumina and titanium dioxide, the titanium dioxide and alumina titanium particles can cover on the material surface, form a protective layer, especially after the intervention of the aerogel silica molecules, the synergistic effect is generated, and the stability of the carbon layer is obviously improved. Meanwhile, the crystal type of the alumina and titanium dioxide will change during the heating process, and the process is endothermic, which can rapidly cool the formed carbon layer, and further play a fixing role. Therefore, for the TPE material prone to dripping, the alumina and titanium dioxide are the fixing carbon layer.

[0022] The technical solution adds the ammonium polyphosphate, the flame-retardant mechanism of the ammonium polyphosphate (APP) mainly includes the following aspects: expansion and carbonization: the ammonium polyphosphate will expand and form a carbonization layer when heated, and the carbonization layer can isolate oxygen and heat, thereby preventing the spread of fire. Isolation of air: the polyphosphoric acid and non-combustible gas generated by the decomposition of the ammonium polyphosphate cover on the material surface, form an isolation layer, and prevent oxygen from entering the material interior. Heat insulation: the non-combustible gas and carbonization layer generated by the decomposition of the ammonium polyphosphate can reduce the temperature of the material and reduce the heat transfer. Release of non-combustible gas: the ammonium polyphosphate releases nitrogen, ammonia and other non-combustible gases when heated, and the gases can dilute the oxygen in the air, thereby blocking the supply of oxygen.

[0023] The process of forming the carbon layer in the technical solution is as follows: ammonium polyphosphate is used as an acid source to release inorganic acid at a relatively low temperature; the inorganic acid released at a temperature slightly higher than the temperature at which the acid source releases the acid undergoes esterification with alcohol; the flame-retardant material gradually melts and softens before and during the esterification; water vapor generated during the reaction and non-combustible gas released by the gas source make the whole molten system foam and expand; meanwhile, the ester is dehydrated and carbonized to form inorganic matter and carbon residues; then the system is gelled and solidified to form a porous carbon layer, and the reaction ends. These steps occur almost simultaneously, but must be carried out in strict order. If any of the reactions cannot be carried out in time, the effect of expansion and flame retardation cannot be achieved. The carbon layer formed is itself non-combustible and has the effects of heat insulation and oxygen insulation, which can weaken the heat conduction between the polymer matrix and the external heat source and prevent the combustible gas generated by degradation from entering the combustion zone as fuel to support combustion. At the same time, the carbon layer can also prevent the diffusion and transmission of oxygen to the inside of the polymer. When the combustion cannot obtain sufficient oxygen and heat energy, the combustion process is stopped.

[0024] The technical solution adds piperazine polyphosphate, which decomposes to generate phosphoric acid and polyphosphoric acid at a relatively low temperature in the initial stage of combustion, catalyzes the degradation of the matrix material to form a carbon layer, and then the piperazine structure on the piperazine polyphosphate has excellent carbon formation performance, so that the carbon layer formed after combustion can block heat, combustible volatile matter and oxygen, further protecting the matrix material. Furthermore, the decomposition products phosphorus-oxygen group and phosphorus free radical will interrupt the heat release process and inhibit combustion through the gas phase channel (including the high porosity existing in the silica aerogel) by the free radical mechanism. In addition, the non-combustible gases such as N2 and NH3 generated by the piperazine polyphosphate during combustion can dilute the combustible gases and inhibit combustion. Finally, the piperazine ring structure is similar to the benzene ring and has outstanding thermal stability, and the piperazine segment can improve the interaction between the titanium dioxide, aluminum oxide and the elastomer material matrix in the component.

[0025] The technical solution synergistically acts with silica aerogel, high-phosphorus polymer and synergistic agent, etc., such as by improving the generation efficiency of the carbon layer, enhancing the stability of the carbon layer, optimizing the structure of the carbon layer or enhancing the gas phase inhibition effect, etc., to collectively improve the overall performance of the flame-retardant system. In particular, the silica aerogel mainly plays a bridging role through nano-pores to connect various components.

[0026] Compared with the prior art, the technical solution has the following beneficial effects:

[0027] (1) The aerogel modified gas phase TPE flame-retardant material provided and prepared by the technical solution has a high pore density of the aerogel modified aluminum diethyl hypophosphite, increases the nano-pores to promote the gas phase effect, makes the gas phase flame-retardant effect of the gas phase flame retardant strong, and does not destroy the fixed carbon layer generated during combustion, having both gas phase and carbon formation flame-retardant effects.

[0028] (2) The aerogel modified gas phase TPE flame-retardant material provided and prepared in the technical solution has the advantages of less flame retardant addition amount, no melt dripping phenomenon during combustion, and high bonding strength between the combustion layer and the secondary combustion layer.

[0029] (3) The aerogel modified gas phase TPE flame-retardant material provided and prepared in the technical solution can reduce the thermal conductivity of the material, thereby having the advantage of good heat insulation.

[0030] (4) The aerogel modified gas phase TPE flame-retardant material provided and prepared in the technical solution greatly improves the flame-retardant effect through inorganic / organic dual synergistic effect with low influence on mechanical properties.

[0031] (5) Compared with traditional surface modifiers, the surface modifier selected in the technical solution can improve the compatibility between the TPE and the flame retardant, further improve the mechanical properties of the material, and ensure uniform material discharge during processing.

[0032] (6) The aerogel modified gas phase TPE flame-retardant material provided and prepared in the technical solution can reduce the dust of the flame retardant due to the addition of petroleum-based rubber processing oil, and improve lubricity.

[0033] (7) The preparation method of the aerogel modified gas phase TPE flame-retardant material provided in the technical solution sets the first zone processing temperature at 140-180℃, the processing temperature of other zones at 150-200℃, and the die temperature at 170-200℃, which can prevent the TPE flame-retardant material from degrading due to excessively high temperature, affecting the performance of the material, and also prevent the TPE flame-retardant material from having poor plasticizing effect due to excessively low temperature, affecting the performance of the material.

[0034] (8) The preparation method of the aerogel modified gas phase TPE flame-retardant material provided in the technical solution can realize industrial production and has a simple preparation process. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 Thermogravimetric (TG) diagram of the flame retardant prepared in Example 1 of the present application. DETAILED DESCRIPTION

[0036] The following will be further described in detail through specific embodiments:

[0037] Example 1

[0038] An aerogel modified gas phase TPE flame retardant material, comprising the following components in parts by weight: TPE 70-90 parts, flame retardant 10-30 parts, antioxidant 0.1-0.5 parts; in this embodiment, the amount of TPE is 2700g, the amount of flame retardant is 309g, and the amount of antioxidant is 0.9g;

[0039] The flame retardant comprises the following components in parts by weight: aerogel modified diethyl aluminum hypophosphite 30-60 parts, high phosphorus polymer 20-50 parts, synergist 5-20 parts, surface modifier 0.5-2 parts, and petroleum-based rubber processing oil 0.5-5 parts, wherein the petroleum-based rubber processing oil is any one of aromatic oil, naphthenic oil, and paraffin oil. In this embodiment, the amount of aerogel modified diethyl aluminum hypophosphite is 150g, the amount of high phosphorus polymer is 120g, the amount of synergist is 30g, the amount of surface modifier is 3g, the petroleum-based rubber processing oil selected is paraffin oil, the amount of paraffin oil is 6g, and the manufacturer of paraffin oil is Taipu Petrochemical Co., Ltd.

[0040] The aerogel modified diethyl aluminum hypophosphite comprises the following components in parts by weight: aminosilica aerogel powder 2-10 parts and diethyl aluminum hypophosphite 80-100 parts. In this embodiment, the amount of aminosilica aerogel powder is 6g, and the amount of diethyl aluminum hypophosphite is 144g. The manufacturer of aminosilica aerogel powder is Zhonghua Lu New Material Co., Ltd., and the manufacturer of diethyl aluminum hypophosphite is Chongqing Ke Polu New Material Co., Ltd.

[0041] The TPE is any one of thermoplastic polyurethane elastomer (TPU), thermoplastic polyester elastomer (TPEE), thermoplastic polyolefin elastomer (TPO), thermoplastic dynamic vulcanization rubber (TPV), and thermoplastic rubber (TPR). The thermoplastic polyurethane elastomer (TPU) is any one of polyester TPU and polyether TPU. In this embodiment, the TPE is polyether TPU, and the manufacturer of polyether TPU is Lubrizol Company, USA.

[0042] The high phosphorus polymer is any one of polyphosphazene and ammonium polyphosphate. In this embodiment, the high phosphorus polymer is ammonium polyphosphate. The manufacturers of polyphosphazene and ammonium polyphosphate are both Changfeng Chemical Co., Ltd. in Shifang City.

[0043] The synergist comprises the following components in parts by weight: titanium dioxide 4-15 parts and aluminum oxide 3-10 parts. In this embodiment, the amount of titanium dioxide is 18g, and the amount of aluminum oxide is 12g. Both titanium dioxide and aluminum oxide are commercially available products.

[0044] The antioxidant is any one or a combination of antioxidant 1010 and antioxidant 168, and in the embodiment, the antioxidant 1010 is selected, and the manufacturer is BASF SE, Germany;

[0045] The surface modifier is any one or a combination of amino polymer, vinyl oligomer, alkyl amino copolymer, titanium chelate, and the addition of the surface modifier mainly improves the compatibility of the flame retardant and the TPE, and at the same time, the water resistance and oil resistance of the flame retardant can be improved. In the embodiment, the surface modifier is N-phenyl-3-aminopropyl trimethoxysilane, and the surface modifier is commercially available.

[0046] The preparation method of the flame retardant comprises the following steps:

[0047] S1: a certain amount of aminosilica aerogel powder and diethyl aluminum hypophosphite are weighed and placed in a high-speed mixer, the rotating speed of the mixer is 500-1500 r / min, and the high-speed stirring is carried out at 80-130℃ for 10-30 min, wherein the mass ratio of the aminosilica aerogel powder to the diethyl aluminum hypophosphite is 1:(20-30), and in the embodiment, the mass ratio of the aminosilica aerogel powder to the diethyl aluminum hypophosphite is 1:24, the high-speed stirring is carried out at 100℃ for 15 min, and the rotating speed of the mixer is 800 r / min;

[0048] S2: the high-speed mixer in S1 is sequentially added with ammonium polyphosphate, aluminum oxide and titanium dioxide, and then the surface modifier is sprayed in the stirring process, wherein the mass ratio of the ammonium polyphosphate, the titanium dioxide and the aluminum oxide is (30-40):(12-6):(8-4) in turn, and in the embodiment, the mass ratio of the ammonium polyphosphate, the titanium dioxide and the aluminum oxide is 20:3:2 in turn, and the amount of the surface modifier is 3 g;

[0049] S3: after the spraying of the surface modifier is completed, paraffin oil is further added and stirred for 12-20 min to obtain the flame retardant, and in the embodiment, the stirring is carried out for 15 min.

[0050] A preparation method of an aerogel modified gas phase TPE flame retardant material is as follows: 2700g of polyether TPU, 309g of a flame retardant, and 0.9g of an antioxidant are uniformly mixed, and are added into a double-screw extruder, the main machine speed is controlled at 350-550r / min, the first zone processing temperature is at 140-180℃, the processing temperature of other zones is at 150-200℃, the head temperature is at 170-200℃, the main machine current is less than the rated current, the length-diameter ratio of the extrusion screw is at (20-30):1, melt blending, extrusion granulation are carried out, and the aerogel modified gas phase TPE flame retardant material is obtained; in this embodiment, the main machine speed is 400r / min, the first zone processing temperature is 150℃, the processing temperature of other zones is 160℃, the head temperature is 180℃, and the length-diameter ratio of the extrusion screw is 20:1,

[0051] Examples 1-6 are prepared according to the preparation raw materials and their amounts of the aerogel modified gas phase TPE flame retardant materials shown in Table 1, and a plurality of different aerogel modified gas phase TPE flame retardant materials are prepared according to the preparation method of Example 1.

[0052] The preparation raw materials and their amounts of the aerogel modified gas phase TPE flame retardant materials of Examples 1-6 are shown in Table 1.

[0053] Table 1

[0054]

[0055] In Examples 3-4, the thermoplastic polyester elastomer is produced by LG Chemical Co., Ltd. of South Korea; and in Examples 5-6, the thermoplastic polyolefin elastomer is produced by Wanhua Chemical Group Co., Ltd.

[0056] Comparative Example 1

[0057] Different from Example 1, 2700g of commercially available polyether TPU is taken, and the performance is detected, and the results are shown in Table 2.

[0058] Comparative Example 2

[0059] Different from Example 1, an aerogel modified gas phase TPE flame retardant material is prepared, the amino-silica aerogel powder in the flame retardant is replaced by silica aerogel powder, and the amount of the silica aerogel powder is 6g.

[0060] The preparation method of the flame retardant is as follows: in S1, 6g of silica aerogel powder is used to replace 6g of amino-silica aerogel powder.

[0061] Comparative Example 3

[0062] Different from Example 1, an aerogel modified gas phase TPE flame retardant material is prepared, and the amino-silica aerogel powder in the flame retardant is not contained, and the addition amount of the amino-silica aerogel powder is 0g.

[0063] The preparation method of the flame retardant, in S1, no amino silica aerogel powder is added.

[0064] Comparative Example 4

[0065] Different from Example 1, a kind of aerogel modified gas phase TPE flame retardant material, the mass ratio of amino silica aerogel powder and diethyl aluminum hypophosphite is 1:14, that is, the amount of amino silica aerogel powder is 10g, and the amount of diethyl aluminum hypophosphite is 140g.

[0066] The preparation method of the flame retardant, in S1, the amount of amino silica aerogel powder is 6g, and the amount of diethyl aluminum hypophosphite is 120g.

[0067] Comparative Example 5

[0068] Different from Example 1, a kind of aerogel modified gas phase TPE flame retardant material, the mass ratio of amino silica aerogel powder and diethyl aluminum hypophosphite is 1:49, that is, the amount of amino silica aerogel powder is 3g, and the amount of diethyl aluminum hypophosphite is 147g.

[0069] The preparation method of the flame retardant, in S1, the amount of amino silica aerogel powder is 3g, and the amount of diethyl aluminum hypophosphite is 147g.

[0070] Comparative Example 6

[0071] Different from Example 1, a kind of aerogel modified gas phase TPE flame retardant material, in the flame retardant, the synergist only includes titanium dioxide, does not contain aluminum oxide, and the amount of titanium dioxide is 30g.

[0072] The preparation method of the flame retardant, in S2, the amount of aluminum oxide added is 0g, and the amount of titanium dioxide is 30g.

[0073] Comparative Example 7

[0074] Different from Example 1, a kind of aerogel modified gas phase TPE flame retardant material, in the flame retardant, the synergist only includes aluminum oxide, does not include titanium dioxide, and the amount of aluminum oxide is 30g.

[0075] The preparation method of the flame retardant, in S2, the amount of aluminum oxide added is 30g, and the amount of titanium dioxide is 0g.

[0076] The detection results of Examples 1-6 and Comparative Examples 1-11 are shown in Table 2.

[0077] Table 2

[0078]

[0079]

[0080] As Figure 1 It can be seen that the thermal decomposition temperature of the flame retardant prepared in Example 1 can reach more than 300℃, while the general processing temperature of TPE elastomer material is 200℃. Therefore, the flame retardant in the present patent will not cause the decline of material properties such as thermal performance and mechanical performance of the material due to thermal decomposition of the flame retardant during the material processing.

[0081] As can be seen from Table 2, the aerogel modified gas phase TPE flame retardant material provided and prepared in Examples 1-6 has the advantages of excellent flame retardant performance and mechanical performance, and the material will not have the phenomenon of melt dripping during use.

[0082] As can be seen from Table 2, compared with Comparative Example 1, the mechanical performance of the pure polyether type TPU material is relatively good, but the flame retardant performance is relatively poor, and is accompanied by the phenomenon of melt dripping.

[0083] As can be seen from Table 2, compared with Comparative Example 2, after replacing the aminosilica aerogel powder with silica aerogel powder, the flame retardant performance of the material is equivalent to that of Example 1, but the mechanical performance of Comparative Example 2 is relatively poor.

[0084] As can be seen from Table 2, compared with Comparative Example 3, if the aminosilica aerogel powder is not added in the flame retardant, the mechanical performance and the flame retardant performance of the material are both relatively poor, and are accompanied by the phenomenon of melt dripping.

[0085] As can be seen from Table 2, compared with Comparative Examples 4-5, if the amount of aminosilica aerogel powder is too much or too little, although the mechanical performance is better than that of Example 1, the flame retardant performance is significantly lower than that of Example 1, and is accompanied by the phenomenon of melt dripping.

[0086] As can be seen from Table 2, compared with Comparative Example 6, if the alumina is not added in the flame retardant, although the mechanical performance is better than that of Example 1, the flame retardant performance is significantly lower than that of Example 1, and is accompanied by the phenomenon of melt dripping.

[0087] As can be seen from Table 2, compared with Comparative Example 7, if the titanium dioxide is not added in the flame retardant, although the mechanical performance is better than that of Example 1, the flame retardant performance is significantly lower than that of Example 1, and is accompanied by the phenomenon of melt dripping.

[0088] The above-mentioned are only embodiments of the present application, and common technical solutions and / or common knowledge of the scheme are not described in detail. It should be pointed out that, for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the patent. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. An aerogel modified aerogel-free TPE flame retardant material characterized by: The components include the following components in parts by weight: TPE 70-90 parts, flame retardant 10-30 parts, antioxidant 0.1-0.5 parts; The flame retardant includes the following components in parts by weight: aerogel modified diethyl aluminum hypophosphite 30-60 parts, high-phosphorus polymer 20-50 parts, synergist 5-20 parts, surface modifier 0.5-2 parts, petroleum rubber processing oil 0.5-5 parts; The high-phosphorus polymer is any one of polyphosphazene and ammonium polyphosphate; The synergist includes the following components in parts by weight: titanium dioxide 4-15 parts, aluminum oxide 3-10 parts; The aerogel modified diethyl aluminum hypophosphite includes amino silica aerogel powder and diethyl aluminum hypophosphite, and the mass ratio of the amino silica aerogel powder to the diethyl aluminum hypophosphite is 1: (20-30).

2. The aerogel modified gas phase TPE flame retardant material according to claim 1, characterized in that: The TPE is any one of thermoplastic polyurethane elastomer (TPU), thermoplastic polyester elastomer (TPEE), thermoplastic polyolefin elastomer (TPO), thermoplastic dynamic vulcanization rubber (TPV), and thermoplastic rubber (TPR).

3. The aerogel modified gas phase TPE flame retardant material according to claim 2, characterized in that: The preparation method of the flame retardant includes the following steps: S1: respectively take a certain amount of amino silica aerogel powder and diethyl aluminum hypophosphite into a high-speed mixer, the rotating speed of the mixer is 500-1500 r / min, and the high-speed stirring is carried out at 80-130 ℃ for 10-30 min; S2: further add the high-phosphorus polymer, aluminum oxide and titanium dioxide into the high-speed mixer in S1 in sequence, and then spray the surface modifier in the stirring process; S3: after the spraying of the surface modifier is completed, further add the petroleum rubber processing oil, and continue to stir for 12-20 min to obtain the flame retardant.

4. The aerogel modified gas phase TPE flame retardant material according to claim 3, characterized in that: In S2, the mass ratio of the ammonium polyphosphate, titanium dioxide and aluminum oxide is (30-40):(12-6):(8-4) in sequence.

5. The preparation method of an aerogel-modified gaseous TPE flame-retardant material according to claim 4, characterized in that: The TPE, the flame retardant and the antioxidant are mixed uniformly, and are added into a double-screw extruder, the rotating speed of the main machine is controlled at 350-550 r / min, the processing temperature of the first area is controlled at 140-180 ℃, the processing temperature of other areas is controlled at 150-200 ℃, and the die head temperature is controlled at 170-200 ℃, so that the melt blending, extrusion and granulation are carried out to obtain the aerogel modified gas-phase TPE flame retardant material.

6. The method for preparing an aerogel-modified fumed TPE flame-retardant material according to claim 5, characterized in that: The length-diameter ratio of the extrusion screw is (20-30):1.

Images