Aerogel modified gas-phase TPE (thermoplastic elastomer) flame-retardant material and preparation method thereof

Abstract

The invention relates to the technical field of high polymer materials, and discloses an aerogel modified gas-phase TPE (thermoplastic elastomer) flame-retardant material which comprises the following components in parts by weight: 70-90 parts of TPE, 10-30 parts of a flame retardant and 0.1-0.5 part of an antioxidant, wherein the flame retardant is prepared from the following components in parts by weight: 30 to 60 parts of aerogel modified diethyl aluminum hypophosphite, 20 to 50 parts of a high-phosphorus polymer, 5 to 20 parts of a synergistic agent, 0.5 to 2 parts of a surface modifier and 0.5 to 5 parts of petroleum rubber processing oil; the preparation method comprises the following steps: uniformly mixing the TPE, the flame retardant and the antioxidant, adding the mixture into a double-screw extruder, controlling the rotating speed of a main machine to be 350-550r / min, the processing temperature of a first area to be 140-180 DEG C, the processing temperature of other areas to be 150-200 DEG C and the temperature of a machine head to be 170-200 DEG C, and carrying out melt blending and extrusion granulation to obtain the aerogel modified gas-phase TPE flame-retardant material. According to the technical scheme, the TPE flame-retardant material which is excellent in flame retardant property, remarkable in heat insulation effect and excellent in mechanical property can be obtained, meanwhile, the material does not have the molten drop phenomenon in the using process, and industrial production can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to an aerogel-modified gas-phase TPE flame-retardant material and a preparation method thereof. Background Art

[0002] It is a material that has the characteristics of high elasticity, high strength, high resilience and injection molding of rubber. It mainly includes 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 automobiles, electronic appliances, medical equipment, sports equipment, household goods, etc. However, since TPE is usually composed of a variety of polymers and often contains a large number of flammable hydrocarbon chain structures, it poses a great fire hazard under certain circumstances. For example, in the field of electronic appliances, if ordinary TPE materials are used for components such as wires and cables, electrical housings, and sockets, when a circuit failure, overload or short circuit occurs and an open flame is generated, TPE will burn rapidly, which is very likely to cause a serious fire, causing immeasurable casualties and property losses. In view of this, it is very important to modify TPE to be flame retardant.

[0003] At present, the flame retardants commonly used in TPE are halogen, nitrogen-phosphorus and inorganic. Materials containing halogen flame retardants will produce a lot of smoke and toxic corrosive gases when burning. Many countries, including the European Union, have formulated relevant laws and regulations to control the use of halogen flame retardants. The amount of inorganic flame retardants added is relatively large, usually around 50%. Although it can achieve a flame retardant effect, it seriously affects the processing performance and mechanical properties of the material. However, after a large amount of phosphorus-nitrogen flame retardants are added to TPE materials (especially TPEE and TPU) on the market, there is still a phenomenon of melting droplets, and it can ignite flammable materials such as cotton, which seriously affects the flame retardant grade and the chain reaction caused by combustion (such as igniting other flammable materials after low temperature). Therefore, the development of a TPE flame retardant material that does not melt droplets, is highly flame retardant, heat-insulating, has good mechanical properties, and can be industrially produced is an urgent problem that needs to be solved in the current market. Summary of the invention

[0004] The present invention aims to provide an aerogel-modified gas-phase TPE flame-retardant material and a preparation method thereof, so as to obtain a TPE flame-retardant material with excellent flame retardancy, significant heat insulation effect and excellent mechanical properties. At the same time, the material will not have a melting droplet phenomenon during use and can be industrially produced.

[0005] To achieve the above object, the present invention adopts the following technical scheme: an aerogel-modified gas-phase TPE flame-retardant material, comprising the following components in parts by weight: 70-90 parts of TPE, 10-30 parts of flame retardant, and 0.1-0.5 parts of antioxidant;

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

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

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

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

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

[0011] Preferably, the method for preparing the flame retardant comprises the following steps:

[0012] S1: Weigh a certain amount of amino silica aerogel powder and diethyl aluminum hypophosphite respectively and place them in a high-speed stirrer at a speed of 500-1500 r / min at 80-130°C for 10-30 min;

[0013] S2: Add high phosphorus polymer, aluminum oxide and titanium dioxide to the high-speed mixer in S1 in sequence, and then spray the surface modifier during the stirring process;

[0014] S3, after the surface modifier is sprayed, add petroleum-based rubber processing oil and continue stirring for 12-20 minutes to obtain a flame retardant.

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

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

[0017] The present invention also provides another technical solution, a method for preparing an aerogel-modified gas-phase TPE flame-retardant material, wherein TPE, a flame retardant and an antioxidant are uniformly mixed, added into a twin-screw extruder, the main engine speed is controlled at 350-550r / min, the processing temperature of the first zone is at 140-180°C, the processing temperature of other zones is at 150-200°C, the head temperature is at 170-200°C, melt blending and extrusion granulation are performed to obtain an aerogel-modified gas-phase TPE flame-retardant material.

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

[0019] Mechanism of action:

[0020] In this technical solution, due to the addition of aminated silica aerogel powder, aminated silica aerogel is a porous network structure material with high porosity and small pore size. After other components produce non-combustible gas due to combustion, it can quickly reach the combustion site through the high-porosity nanopores, hindering the combustion process and reducing the flame propagation speed. In addition, the thermal conductivity of aminated silica aerogel is extremely low, and 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, play an insulating protective effect, and thus play a role in promoting the gas phase.

[0021] In this technical solution, due to the addition of alumina and titanium dioxide, titanium dioxide and alumina titanium particles can cover the surface of the material to form a protective layer, especially after the aerogel silica molecules are involved, the synergistic effect is produced, and the stability of the carbon layer is significantly improved. At the same time, they will undergo a crystal transformation during the heating process. This process is endothermic, which quickly cools the formed carbon layer and further plays a fixing role. Therefore, for TPE materials that are prone to dripping, alumina and titanium dioxide are fixed carbon layers.

[0022] Due to the addition of ammonium polyphosphate in this technical solution, the flame retardant mechanism of ammonium polyphosphate (APP) mainly includes the following aspects: Expansion and carbonization: ammonium polyphosphate will expand and form a carbonized layer when heated. This carbonized layer can isolate oxygen and heat, thereby preventing the spread of fire. Isolating air: polyphosphoric acid and non-combustible gases produced by the decomposition of ammonium polyphosphate cover the surface of the material, forming an isolation layer to prevent oxygen from entering the interior of the material. Heat insulation: the non-combustible gas and carbonized layer produced by the decomposition of ammonium polyphosphate can lower the temperature of the material and reduce heat transfer. Release of non-combustible gas: ammonium polyphosphate releases non-combustible gases such as nitrogen and ammonia when decomposed by heat. These 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, which decomposes and releases inorganic acid at a relatively low temperature; at a temperature slightly higher than the temperature at which the acid source releases the acid, the inorganic acid released by the decomposition reacts with the alcohol to undergo an esterification reaction, and the flame retardant material gradually melts and softens before and during the esterification process. The water vapor generated during the reaction and the incombustible gas released by the gas source cause the entire molten system to foam and expand, and at the same time, the ester is dehydrated and carbonized to form inorganic and carbon residues. Subsequently, the system gels and solidifies to form a porous foam carbon layer, and the reaction ends. These steps occur almost simultaneously, but must be carried out in a strict order. If any of the reactions cannot be carried out in a timely manner, it cannot play the role of expansion and flame retardancy. The formed carbon layer itself is non-combustible, and has the functions of heat insulation and oxygen isolation, 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 prevent the diffusion and transfer of oxygen into the polymer. When the combustion does not obtain enough oxygen and heat energy, the combustion process is terminated.

[0024] In this technical solution, due to the addition of piperazine polyphosphate, piperazine polyphosphate decomposes to produce phosphoric acid and polyphosphoric acid at the initial stage of combustion at a relatively low temperature, catalyzing the degradation of the matrix material to produce a carbon layer. Then, because the piperazine structure on piperazine polyphosphate has excellent carbon-forming properties, the carbon layer formed after combustion can block heat, combustible volatiles and oxygen, further protecting the matrix material. Furthermore, its decomposition products, phosphorus oxy and phosphorus free radicals, will interrupt the exothermic process and inhibit combustion through a free radical mechanism through the gas phase channel (including the high porosity present in the silica aerogel). In addition, the focused piperazine phosphate will produce non-flammable gases such as N2 and NH3 during the combustion process to dilute the combustible gas and inhibit combustion. Finally, the piperazine ring structure is similar to the benzene ring and has outstanding thermal stability. The piperazine segment will improve the interaction between titanium dioxide, aluminum oxide and the elastomer material matrix in the component.

[0025] This technical solution improves the overall performance of the flame retardant system through the synergistic effect of silica aerogel, high phosphorus polymers and synergists, such as by improving the efficiency of carbon layer generation, enhancing the stability of carbon layer, optimizing carbon layer structure or enhancing gas phase inhibition, etc. In particular, silica aerogel mainly acts as a bridge to connect various components through nanopores.

[0026] Compared with the prior art, the beneficial effects of this solution are:

[0027] (1) The aerogel-modified gas-phase TPE flame-retardant material provided and prepared by the technical scheme has a high pore density of aerogel-modified diethyl aluminum hypophosphite. By increasing the nanopores to promote the gas phase effect, the gas phase flame retardant produces a strong gas phase flame retardant effect without destroying the fixed carbon layer produced during the original combustion, and has a dual flame retardant effect of gas phase and carbonization.

[0028] (2) The aerogel-modified gas-phase TPE flame-retardant material provided and prepared by the present technical solution has the advantages of a small amount of flame retardant added, no droplet 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 by the present technical solution can reduce the thermal conductivity of the material, thereby making the material have the advantage of good thermal insulation.

[0030] (4) The aerogel-modified gas-phase TPE flame-retardant material provided and prepared by this technical solution greatly improves the flame-retardant effect while having a lower impact on mechanical properties through the inorganic / organic dual synergistic effect.

[0031] (5) Compared with traditional surface modifiers, the surface modifier selected in the present technical solution can improve the compatibility between TPE and flame retardant, and at the same time, can further improve the mechanical properties of the material, while ensuring that the material is fed evenly during processing.

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

[0033] (7) In the preparation method of the aerogel-modified gas-phase TPE flame-retardant material provided by the technical solution, during the preparation process of the material, the processing temperature of the first zone is set at 140-180°C, the processing temperature of other zones is set at 150-200°C, and the head temperature is set at 170-200°C. This can prevent the temperature from being too high, which may cause the TPE flame-retardant material to degrade and affect the performance of the material. At the same time, it can also prevent the temperature from being too low, which may cause the TPE flame-retardant material and the flame retardant powder to have a poor plasticizing effect and affect the performance of the material.

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

[0035] Figure 1 This is the thermogravimetric (TG) diagram of the flame retardant prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0036] The following is further described in detail through specific implementation methods:

[0037] Example 1

[0038] An aerogel-modified gas-phase TPE flame-retardant material comprises the following components in parts by weight: 70-90 parts of TPE, 10-30 parts of flame retardant, and 0.1-0.5 parts of antioxidant; 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] Wherein, the flame retardant includes the following components in parts by weight: 30-60 parts of aerogel-modified diethyl aluminum hypophosphite, 20-50 parts of high-phosphorus polymer, 5-20 parts of synergist, 0.5-2 parts of surface modifier, and 0.5-5 parts of petroleum rubber processing oil, wherein the petroleum rubber processing oil is any one of aromatic oil, cyclohexane 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, and the petroleum rubber processing oil is paraffin oil, the amount of paraffin oil is 6g, and the manufacturer of paraffin oil is Formosa Petrochemical Corporation;

[0040] Aerogel modified diethyl aluminum hypophosphite includes the following components in parts by weight: 2-10 parts of aminated silica aerogel powder and 80-100 parts of diethyl aluminum hypophosphite. In this embodiment, the amount of aminated silica aerogel powder is 6 g, and the amount of diethyl aluminum hypophosphite is 144 g. The manufacturer of aminated silica aerogel powder is China Chemical Hualu New Materials Co., Ltd., and the manufacturer of diethyl aluminum hypophosphite is Chongqing Kejufu New Materials Co., Ltd.

[0041] TPE is any one of thermoplastic polyurethane elastomer (TPU), thermoplastic polyester elastomer (TPEE), thermoplastic polyolefin elastomer (TPO), thermoplastic dynamic vulcanized rubber (TPV), and thermoplastic rubber (TPR); thermoplastic polyurethane elastomer (TPU) is any one of polyester TPU and polyether TPU. In the present embodiment, TPE uses polyether TPU, and the manufacturer of polyether TPU is American Lubrizol Company;

[0042] The high-phosphorus polymer is any one of piperazine polyphosphate and ammonium polyphosphate. In this embodiment, ammonium polyphosphate is selected as the high-phosphorus polymer. The manufacturers of piperazine polyphosphate and ammonium polyphosphate are Shifang Changfeng Chemical Co., Ltd.

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

[0044] The antioxidant is any one of antioxidant 1010 and antioxidant 168 or a combination of the two. In this embodiment, the antioxidant is antioxidant 1010, and the manufacturer is BASF AG of Germany;

[0045] The surface modifier is any one of amino polymers, vinyl oligomers, alkylamino copolymers, and titanium chelates, or a combination of the two. The addition of the surface modifier mainly improves the compatibility of the flame retardant with TPE, and at the same time, can improve the water resistance and oil resistance of the flame retardant. In this embodiment, the surface modifier is N-phenyl-3-aminopropyltrimethoxysilane, and the surface modifier is commercially available.

[0046] The method for preparing a flame retardant comprises the following steps:

[0047] S1: Weigh a certain amount of aminated silica aerogel powder and diethyl aluminum hypophosphite respectively and place them in a high-speed stirrer. The speed of the stirrer is 500-1500 r / min. The mixture is stirred at high speed for 10-30 min at 80-130° C., wherein the mass ratio of aminated silica aerogel powder to diethyl aluminum hypophosphite is 1:(20-30). In this embodiment, the mass ratio of aminated silica aerogel powder to diethyl aluminum hypophosphite is 1:24. The mixture is stirred at high speed for 15 min at 100° C., and the speed of the stirrer is 800 r / min.

[0048] S2: adding ammonium polyphosphate, alumina and titanium dioxide to the high-speed mixer in S1 in sequence, and then spraying a surface modifier during the stirring process, wherein the mass ratio of ammonium polyphosphate, titanium dioxide and alumina is (30-40):(12-6):(8-4) in sequence. In this embodiment, the mass ratio of ammonium polyphosphate, titanium dioxide and alumina is 20:3:2 in sequence, and the amount of the surface modifier is 3 g;

[0049] S3, after the surface modifier is sprayed, paraffin oil is added and stirring is continued for 12-20 minutes to obtain a flame retardant. In this embodiment, stirring is performed for 15 minutes.

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

[0051] Examples 1-6 According to the raw materials and amounts of the aerogel-modified gas-phase TPE flame-retardant materials shown in Table 1 and the preparation method of Example 1, various aerogel-modified gas-phase TPE flame-retardant materials were prepared.

[0052] The raw materials and amounts used in preparing 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 manufacturer of the thermoplastic polyester elastomer used is LG Chemical Co., Ltd. of South Korea; the manufacturer of the thermoplastic polyolefin elastomer used in Examples 5-6 is Wanhua Chemical Group Co., Ltd.

[0056] Comparative Example 1

[0057] Different from Example 1, 2700 g of commercially available polyether TPU was taken and its performance was tested. The results are shown in Table 2.

[0058] Comparative Example 2

[0059] Different from Example 1, in an aerogel-modified gas-phase TPE flame retardant material, silica aerogel powder is used in the flame retardant to replace the aminated silica aerogel powder, and the amount of silica aerogel powder used is 6 g.

[0060] In the method for preparing a flame retardant, in S1, 6 g of silica aerogel powder is used to replace 6 g of amination silica aerogel powder.

[0061] Comparative Example 3

[0062] Different from Example 1, in the aerogel-modified gas-phase TPE flame retardant material, the flame retardant does not contain amino-containing silica aerogel powder, and the amount of amino-containing silica aerogel powder added is 0 g.

[0063] In the method for preparing a flame retardant, in S1, no aminated silica aerogel powder is added.

[0064] Comparative Example 4

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

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

[0067] Comparative Example 5

[0068] Different from Example 1, in an aerogel-modified gas-phase TPE flame retardant material, the mass ratio of the aminated silica aerogel powder to diethylaluminum hypophosphite is 1:49, that is, the amount of the aminated silica aerogel powder is 3 g, and the amount of diethylaluminum hypophosphite is 147 g.

[0069] Preparation method of flame retardant: In S1, the amount of amino-treated silica aerogel powder is 3 g, and the amount of diethyl aluminum hypophosphite is 147 g.

[0070] Comparative Example 6

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

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

[0073] Comparative Example 7

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

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

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

[0077] Table 2

[0078]

[0079]

[0080] like Figure 1 It can be seen that the flame retardant prepared in Example 1 has a thermal decomposition temperature of more than 300° C., while the general processing temperature of TPE elastomer materials is 200° C. Therefore, during the material processing, the flame retardant in this patent will not suffer from a decrease in material properties such as thermal properties and mechanical properties due to thermal decomposition of the flame retardant.

[0081] It can be seen from Table 2 that the aerogel-modified gas-phase TPE flame-retardant materials provided and prepared in Examples 1-6 have the advantages of excellent flame-retardant properties and mechanical properties, and the material will not have a melting droplet phenomenon during use.

[0082] It can be seen from Table 2 that, by comparing Example 1 with Comparative Example 1, although the mechanical properties of the pure polyether TPU material are relatively good, its flame retardant properties are relatively poor and are accompanied by a droplet phenomenon.

[0083] As can be seen from Table 2, by comparing Example 1 with Comparative Example 2, after replacing the amino-treated silica aerogel powder with silica aerogel powder, the flame retardant properties of the material are comparable to those of Example 1, but the mechanical properties of Comparative Example 2 are relatively poor.

[0084] It can be seen from Table 2 that, by comparing Example 1 with Comparative Example 3, if the amino-containing silica aerogel powder is not added to the flame retardant, the mechanical properties and flame retardant properties of the material are relatively poor, and are accompanied by a droplet phenomenon.

[0085] As can be seen from Table 2, by comparing Example 1 with Comparative Examples 4-5, the amount of amino-containing silica aerogel powder used is too much or too little. Although its mechanical properties are better than those of Example 1, its flame retardant properties are significantly lower than those of Example 1, and are accompanied by a droplet phenomenon.

[0086] As can be seen from Table 2, by comparing Example 1 with Comparative Example 6, no aluminum oxide is added to the flame retardant. Although its mechanical properties are better than those of Example 1, its flame retardant properties are significantly lower than those of Example 1, and are accompanied by a droplet phenomenon.

[0087] As can be seen from Table 2, by comparing Example 1 with Comparative Example 7, titanium dioxide is not added to the flame retardant. Although its mechanical properties are better than those of Example 1, its flame retardant properties are significantly lower than those of Example 1, and are accompanied by a droplet phenomenon.

[0088] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An aerogel-modified gas-phase TPE flame-retardant material, characterized in that: The composition comprises the following components in parts by weight: 70-90 parts of TPE, 10-30 parts of flame retardant, and 0.1-0.5 parts of antioxidant; The flame retardant comprises the following components in parts by weight: 30-60 parts of aerogel-modified diethyl aluminum hypophosphite, 20-50 parts of high-phosphorus polymer, 5-20 parts of synergist, 0.5-2 parts of surface modifier, and 0.5-5 parts of petroleum-based rubber processing oil.

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

3. The aerogel-modified gas-phase TPE flame-retardant material according to claim 1, characterized in that: The high-phosphorus polymer is any one of piperazine polyphosphate and ammonium polyphosphate.

4. An aerogel-modified gas-phase TPE flame-retardant material according to any one of claims 1 to 3, characterized in that: The aerogel-modified diethyl aluminum hypophosphite comprises the following components in parts by weight: 2-10 parts of amino-treated silicon dioxide aerogel powder and 80-100 parts of diethyl aluminum hypophosphite.

5. The aerogel-modified gas-phase TPE flame-retardant material according to claim 4, characterized in that: The synergist comprises the following components in parts by weight: 4-15 parts of titanium dioxide and 3-10 parts of aluminum oxide.

6. The aerogel-modified gas-phase TPE flame-retardant material according to claim 5, characterized in that: The method for preparing a flame retardant comprises the following steps: S1: Weigh a certain amount of amino silica aerogel powder and diethyl aluminum hypophosphite respectively and place them in a high-speed stirrer at a speed of 500-1500 r / min at 80-130°C for 10-30 min; S2: Add high phosphorus polymer, aluminum oxide and titanium dioxide to the high-speed mixer in S1 in sequence, and then spray the surface modifier during the stirring process; S3, after the surface modifier is sprayed, add petroleum-based rubber processing oil and continue stirring for 12-20 minutes to obtain a flame retardant.

7. The aerogel-modified gas-phase TPE flame-retardant material according to claim 6, characterized in that: In S1, the mass ratio of the aminated silica aerogel powder to diethylaluminum hypophosphite is 1:(20-30).

8. The aerogel-modified gas-phase TPE flame-retardant material according to claim 7, characterized in that: In S2, the mass ratios of ammonium polyphosphate, titanium dioxide and aluminum oxide are (30-40):(12-6):(8-4) respectively.

9. The method for preparing an aerogel-modified gas-phase TPE flame-retardant material according to claim 8, characterized in that: The TPE, flame retardant and antioxidant are mixed evenly, added into a twin-screw extruder, the main engine speed is controlled at 350-550r / min, the processing temperature of the first zone is controlled at 140-180°C, the processing temperature of other zones is controlled at 150-200°C, the head temperature is controlled at 170-200°C, melt blending and extrusion granulation are performed to obtain an aerogel modified gas phase TPE flame retardant material.

10. The method for preparing an aerogel-modified gas-phase TPE flame-retardant material according to claim 9, characterized in that: The aspect ratio of the extrusion screw is (20-30):1.

Images