TEMP derivative and inorganic metal compound synergistic flame-retardant weather-resistant high polymer material and preparation method thereof

Abstract

The invention discloses a TEMP derivative and inorganic metal compound synergistic flame-retardant weather-resistant high polymer material and a preparation method thereof, and particularly relates to the technical field of grinding. The material is composed of the following components: 38-82 wt% of a polymer matrix, 0.5-5 wt% of a TEMP derivative, 15-40 wt% of an oxide or hydroxide flame retardant, 0.5-2 wt% of a silane coupling agent, and 0.3-15 wt% of a synergistic auxiliary agent, the TEMP derivative in the polymer material can capture H., OH. And other active free radicals in a combustion process, inhibit a chain combustion reaction, and improve the flame retardance of the polymer material. The oxide or hydroxide flame retardant generates a heat-insulating metal oxide layer in the decomposition process, carbonization is promoted, a physical barrier is formed, and efficient flame retardance under the low addition amount is achieved through the synergistic effect of the oxide or hydroxide flame retardant and the physical barrier.

Description

Technical Field

[0001] The present invention belongs to the technical field of flame retardancy and weather resistance of polymer materials, and particularly relates to a synergistic flame retardant and weather resistant polymer material composed of a TEMP derivative and an inorganic metal compound and a preparation method thereof. Background Art

[0002] Under the current technical background, due to the wide application of polymer materials in key fields such as electronics, automobiles, and construction, the problems of their flammability and insufficient weather resistance have become increasingly prominent, becoming key factors restricting their further application. Traditional inorganic metal compound flame retardants, such as magnesium hydroxide and aluminum hydroxide, although they can achieve flame retardant effects through endothermic decomposition and heat insulation layer formation mechanisms, the high dosage requirements not only increase production costs but also significantly affect the mechanical properties and processing properties of the materials.

[0003] TEMP derivatives, with their excellent thermal stability and free radical capture ability, show certain application potential in the field of flame retardancy and are often used as weather resistant additives. However, when used alone, their flame retardant efficiency is limited and it is difficult to meet the strict requirements for the weather resistance of materials in practical applications. Especially in the research on the combination of TEMP derivatives and flame retardant synergy, the existing achievements are still scarce. Although preliminary studies have revealed the possible flame retardant synergy of TEMP derivatives, how to maximize their synergy and simultaneously improve the flame retardancy and weather resistance of materials remains a technical problem to be solved urgently. Summary of the Invention

[0004] The main object of the present invention is to provide a polymer material and a preparation method thereof that achieve high-efficiency flame retardancy and weather resistance through the synergistic effect of a TEMP derivative and an inorganic metal compound. By reasonably controlling the ratio of the TEMP derivative to the inorganic metal compound and adopting a pre-dispersion technology, the two are evenly distributed in the polymer matrix, thereby achieving better flame retardant effects and weather resistance.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A synergistic flame retardant and weather resistant polymer material composed of a TEMP derivative and an inorganic metal compound, which is composed of the following components: the content of the polymer matrix is 38 - 82 wt%, the content of the TEMP derivative is 0.5 - 5 wt%, the content of the oxide or hydroxide flame retardant is 15 - 40 wt%, the content of the silane coupling agent is 0.5 - 2 wt%, and the content of the synergistic additive is 0.3 - 15 wt%.

[0007] As a preferred technical solution of the present invention, the polymer matrix is selected from any one of polypropylene, polyethylene, ethylene-vinyl acetate copolymer, polyester, and epoxy resin.

[0008] As a preferred technical solution of the present invention, the polyester is selected from any one of PET and PBT.

[0009] As a preferred technical solution of the present invention, the TEMP derivative is selected from one or more of poly{[6-[(1,1,3,3-tetramethylbutyl]amino]-1,3,5-triazine-2,4-[(2,2,6,6-tetramethyl-4-piperidyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidyl)imino]}, poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethanol) succinate, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, and 1,5,8,12-tetra(4,6-bis(n-butyl-n-1,2,2,6,6-pentamethyl-4-piperidylamino)-1,3,5-triazin-2-yl)-1,5,8,12-tetraazadodecane.

[0010] As a preferred technical solution of the present invention, the inorganic metal compound flame retardant is selected from any one of magnesium hydroxide, aluminum hydroxide, zinc oxide, magnesium oxide, aluminum oxide, and layered double hydroxides.

[0011] As a preferred technical solution of the present invention, the mass ratio of the TEMP derivative to the oxide or hydroxide flame retardant is 1:7 to 1:70.

[0012] As a preferred technical solution of the present invention, the silane coupling agent is an amino silane coupling agent, and is selected from any one of 3-aminopropyltriethoxysilane, highly active bisamino trialkoxysilane, N,N-dimethylpropylenediaminepropylmethyldimethoxysilane, anilinopropyltrimethoxysilane, 3-ureidopropyltriethoxysilane, N-n-butyl-3-aminopropyltrimethoxysilane, and N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane.

[0013] As a preferred technical solution of the present invention, the synergistic auxiliary agent is selected from one or more of phosphorus-based flame retardants, silicon-based flame retardants, sulfur-based antioxidants, and carbon source enhancers.

[0014] As a preferred technical solution of the present invention, the phosphorus-based flame retardant is selected from one or several of ammonium polyphosphate, red phosphorus, and triphenyl phosphate; the silicon-based flame retardant is selected from one or several of montmorillonite, kaolin, wollastonite, and organosilicon; the sulfur-based antioxidant is distearyl thiodipropionate; and the carbon source enhancer is pentaerythritol or a triazine carbon-forming agent.

[0015] A preparation method of a TEMP derivative and an inorganic metal compound synergistically flame-retarded and weather-resistant polymer material, comprising the following steps:

[0016] (1) Place the oxide or hydroxide flame retardant and the amino-silane coupling agent in a high-speed mixer. Adjust the rotation speed to 1500 - 2000 rpm and control the temperature at 80 - 100 °C. After high-speed mixing for 15 minutes, a surface-modified flame retardant is obtained. When the material temperature of the surface-modified flame retardant drops to 50 °C, add the TEMP derivative and the synergistic auxiliary agent in the high-speed mixer, and continue to mix at a rotation speed of 1500 - 2000 rpm for 5 minutes. Then discharge the material to obtain a premix with a synergistic effect;

[0017] (2) Add the uniformly mixed premix to a twin-screw extruder with a length-to-diameter ratio of 52 through a loss-in-weight feeder from the main feeding port, and add the polymer matrix through a loss-in-weight feeder from the side feeding port. Adjust the rotation speed of the twin-screw extruder to 350 - 500 rpm and set the temperature range at 150 - 260 °C for extrusion granulation to obtain a highly flame-retardant and weather-resistant polymer material.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. Synergistic flame-retardant mechanism: The TEMP derivative can capture active free radicals such as H· and OH· during the combustion process to inhibit the chain combustion reaction; the inorganic metal compound forms a dense heat-insulating metal oxide layer during the combustion process, promotes carbonization, and forms a physical barrier. The two work together to achieve high-efficiency flame retardancy at low addition amounts.

[0020] 2. High-efficiency flame retardancy and weather resistance, low addition amount: By adjusting the ratio of the TEMP derivative to the inorganic metal compound (for example, 1:8 - 1:70), without compromising the mechanical properties and processing properties of the matrix, the flame-retardant standard of UL 94V0 is achieved, and the LOI value is significantly increased, thereby greatly increasing the service life of the material.

[0021] 3. Optimization of modification and dispersion technology: The surface of the inorganic metal compound is modified to improve its compatibility and dispersibility with the polymer matrix, thereby enhancing the synergistic flame-retardant effect.

[0022] 4. Environmental friendliness: The materials used are all environmentally friendly, meeting international environmental protection standards and reducing the negative impact on the environment.

[0023] 5. Wide range of application fields: It is applicable to industries such as electronics and electrical, automotive, construction, and aerospace, meeting the flame-retardant and weather-resistant requirements in various scenarios and improving the comprehensive performance of the material. Specific embodiments

[0024] The following further clarifies the present invention in combination with specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0025] A TEMP derivative and an inorganic metal compound synergistically flame-retardant and weather-resistant polymer material, which is composed of the following components: the content of the polymer matrix is 38-82 wt%, the content of the TEMP derivative is 0.5-5 wt%, the content of the oxide or hydroxide flame retardant is 15-40 wt%, the content of the amino silane coupling agent is 0.5 wt%, and the content of the synergistic auxiliary agent is 0.3-15 wt%.

[0026] The polymer matrix is selected from any one of polypropylene (PP), polyethylene (PE), ethylene-vinyl acetate copolymer (EVA), polyester, and epoxy resin (EP), or other thermoplastic or thermosetting polymers. Among them, the polyester is selected from any one of PET and PBT.

[0027] The TEMP derivative is selected from one or more of poly{[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-[(2,2,6,6-tetramethyl-4-piperidyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidyl)imino]}, poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethyl) succinate, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, and 1,5,8,12-tetra(4,6-bis(n-butyl-n-1,2,2,6,6-pentamethyl-4-piperidylamino)-1,3,5-triazin-2-yl)-1,5,8,12-tetraazadodecane.

[0028] The TEMP derivative is 2,2,6,6-tetramethylpiperidine oxide and its esterification, amidation, or polymerization modification products, and the TEMP derivative contains substances with the TEMP as the parent structure. The structures of the above TEMP derivatives are as follows:

[0029]

[0030] Poly{[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-[(2,2,6,6-tetramethyl-4-piperidyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidyl)imino]}

[0031]

[0032] Poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethyl) succinate

[0033]

[0034] 1,5,8,12 - tetra(4,6 - bis(n - butyl - n - 1,2,2,6,6 - pentamethyl - 4 - piperidinylamino) - 1,3,5 - triazin - 2 - yl) - 1,5,8,12 - tetraazadodecane

[0035] The inorganic metal compound, namely the oxide or hydroxide flame retardant, is selected from any one of magnesium hydroxide, aluminum hydroxide, zinc oxide, magnesium oxide, aluminum oxide, and layered double hydroxide.

[0036] The amino - silane coupling agent is an amino - silane coupling agent, selected from any one of 3 - aminopropyltriethoxysilane, highly active bis - amino - trialkoxysilane, N,N - dimethylpropylenediaminepropylmethyldimethoxysilane, anilinopropyltrimethoxysilane, 3 - ureidopropyltriethoxysilane, N - n - butyl - 3 - aminopropyltrimethoxysilane, and N-(2 - aminoethyl) - 3 - aminopropylmethyldimethoxysilane.

[0037] The synergistic auxiliary agent is selected from one or more of a phosphorus - based flame retardant, a silicon - based flame retardant, a sulfur - based antioxidant, and a carbon - source enhancer. The phosphorus - based flame retardant is selected from one or several of ammonium polyphosphate, red phosphorus, and triphenyl phosphate. The silicon - based flame retardant is selected from one or several of montmorillonite, kaolin, wollastonite, and organosilicon. The sulfur - based antioxidant is dilauryl thiodipropionate, and the carbon - source enhancer is pentaerythritol or a triazine carbon - forming agent.

[0038] A preparation method of a TEMP derivative and an inorganic metal compound synergistically flame - retarding and weather - resistant polymer material, comprising the following steps:

[0039] (1) Place the oxide or hydroxide flame retardant and the amino - silane coupling agent in a high - speed mixer, adjust the rotation speed to 1500 - 2000 rpm, control the temperature at 80 - 100 °C, and mix at high speed for 15 min to obtain a surface - modified flame retardant. When the material temperature of the surface - modified flame retardant drops to 50 °C, add the TEMP derivative and the synergistic auxiliary agent to the high - speed mixer, and continue to mix at a rotation speed of 1500 - 2000 rpm for 5 min, then discharge to obtain a premix.

[0040] (2) Add the uniformly mixed premix to a twin - screw extruder with a length - to - diameter ratio of 52 through a loss - in - weight feeder from the main feeding port, and add the polymer matrix through a loss - in - weight feeder from the side feeding port. Adjust the rotation speed of the twin - screw extruder to 350 - 500 rpm, and set the temperature range to 150 - 260 °C (the temperature of the twin - screw extruder is generally set as a range), and perform extrusion granulation to obtain a highly flame - retarding and weather - resistant polymer material.

[0041] Drugs used in the examples and comparative examples:

[0042] Poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethanol succinate), dilauryl thiodipropionate, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate and poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethanol succinate), selected from Suqian Liansheng Technology Co., Ltd., with industrial purity.

[0043] Ammonium polyphosphate is selected from Nihuo New Materials Co., Ltd., with industrial purity.

[0044] Polypropylene is selected from SELLCO K8003.

[0045] Polyethylene is selected from ExxonMobil 6101.

[0046] Magnesium hydroxide is selected from Jiangsu Aitek Flame Retardant Materials Co., Ltd., with a content of ≥98.5%.

[0047] Aluminum hydroxide is selected from Luoyang Zhongchao New Materials Co., Ltd., with a content of 99%.

[0048] Ethylene-vinyl acetate copolymer is selected from Yangzi Petrochemical-BASF Co., Ltd. V6110MC.

[0049] 3-Aminopropyltriethoxysilane is selected from Chenguang New Materials Co., Ltd., with industrial purity.

[0050] Experimental instruments used in the examples and comparative examples:

[0051] The high-speed mixer is selected from Suzhou Songyuan Environmental Protection Technology Co., Ltd., with the model SHR-110L.

[0052] The twin-screw extruder is selected from Nanjing Kabelon Co., Ltd., with the model STS50.

[0053] The injection molding machine is selected from Haitian Plastic Machinery Group Co., Ltd., with the model MA900I / 280SE.

[0054] Example 1

[0055] A TEMP derivative and an inorganic metal compound synergistically flame-retardant and weather-resistant polymer material, with the following raw material ratios:

[0056]

[0057] A preparation method of a TEMP derivative and an inorganic metal compound synergistically flame-retardant and weather-resistant polymer material, comprising the following steps:

[0058] (1) Place magnesium hydroxide and 3-aminopropyltriethoxysilane in a high-speed mixer, adjust the rotation speed to 1600 rpm, control the temperature at 80 °C and mix at high speed for 15 min to obtain a surface-modified magnesium hydroxide flame retardant. When the material temperature of the surface-modified magnesium hydroxide flame retardant drops to 50 °C, add poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinoethanol) succinate, ammonium polyphosphate and dilauryl thiodipropionate in the high-speed mixer, and continue to mix at a rotation speed of 1600 rpm for 5 min, then discharge to obtain a premix with a synergistic effect.

[0059] (2) Add the uniformly mixed premix to a twin-screw extruder with a length-to-diameter ratio of 52 through a loss-in-weight feeder from the main feed port, and add polypropylene through a loss-in-weight feeder from the side feed port. Adjust the rotation speed of the twin-screw extruder to 350 rpm, and set the temperature range to 150 - 260 °C, where the feeding section is 160 °C - 180 °C, the compression section is 180 °C - 200 °C, the melting and mixing section is 260 °C, and the die head is 180 °C for extrusion granulation to obtain a highly flame-retardant and weather-resistant polymer material.

[0060] (3) Finally, perform a shaping process, and prepare standard flame-retardant, mechanical and accelerated aging specimens from the melt-blended material through an injection molding process. Conduct strict UL-94, limiting oxygen index (LOI), mechanical properties and anti-aging performance tests on the prepared specimens.

[0061] Example 2

[0062] A synergistic flame-retardant and weather-resistant polymer material of a TEMP derivative and an inorganic metal compound, with the following raw material ratios:

[0063]

[0064] A preparation method of a synergistic flame-retardant and weather-resistant polymer material of a TEMP derivative and an inorganic metal compound, comprising the following steps:

[0065] (1) Place aluminum hydroxide and 3-aminopropyltriethoxysilane in a high-speed mixer, adjust the rotation speed to 2000 rpm, control the temperature at 90 °C and mix at high speed for 15 min to obtain a surface-modified aluminum hydroxide flame retardant. When the material temperature of the surface-modified aluminum hydroxide flame retardant drops to 50 °C, add bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, ammonium polyphosphate and dilauryl thiodipropionate in the high-speed mixer, and continue to mix at a rotation speed of 2000 rpm for 5 min, then discharge to obtain a premix with a synergistic effect.

[0066] (2) Add the uniformly mixed premix into a twin-screw extruder with a length-diameter ratio of 52 through a loss-in-weight feeder from the main feeding port, and add polypropylene through a loss-in-weight feeder from the side feeding port. Adjust the rotational speed of the twin-screw extruder to 350 rpm, and set the temperature range to 150 - 200 °C, where the feeding section is 160 - 180 °C, the compression section is 180 - 200 °C, the melting and mixing section is 200 °C, and the die head is 180 °C, then carry out extrusion granulation to obtain a highly efficient flame-retardant and weather-resistant polymer material.

[0067] (3) Finally, carry out forming treatment, and prepare standard flame-retardant, mechanical and accelerated aging specimens from the melt-blended material through an injection molding process. Conduct strict UL 94, limiting oxygen index (LOI), mechanical properties, and anti-aging performance tests on the prepared specimens.

[0068] Example 3

[0069] A synergistic flame-retardant and weather-resistant polymer material of a TEMP derivative and an inorganic metal compound, with the following raw material ratios:

[0070]

[0071] A preparation method of a synergistic flame-retardant and weather-resistant polymer material of a TEMP derivative and an inorganic metal compound, comprising the following steps:

[0072] (1) Place aluminum hydroxide and 3-aminopropyltriethoxysilane in a high-speed mixer, adjust the rotational speed to 1600 rpm, control the temperature at 100 °C and mix at high speed for 15 min to obtain a surface-modified aluminum hydroxide flame retardant. Wait until the material temperature of the surface-modified aluminum hydroxide flame retardant drops to 50 °C, then add bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethyl) succinate, ammonium polyphosphate, and dilauryl thiodipropionate in the high-speed mixer, and continue to mix at a rotational speed of 1600 rpm for 5 min, then discharge to obtain a premix with a synergistic effect.

[0073] (2) Add the uniformly mixed premix into a twin-screw extruder with a length-diameter ratio of 52 through a loss-in-weight feeder from the main feeding port, and add polypropylene through a loss-in-weight feeder from the side feeding port. Adjust the rotational speed of the twin-screw extruder to 350 rpm, and set the temperature range to 150 - 260 °C, the feeding section is 160 °C - 180 °C, the compression section is 180 °C - 200 °C, the melting and mixing section is 220 - 260 °C, and the die head is 180 °C, then carry out extrusion granulation to obtain a highly efficient flame-retardant and weather-resistant polymer material.

[0074] (3) Finally, carry out forming treatment, and prepare standard flame-retardant, mechanical and accelerated aging specimens from the melt-blended material through an injection molding process. Conduct strict UL-94, limiting oxygen index (LOI), mechanical properties, and anti-aging performance tests on the prepared specimens.

[0075] Example 4

[0076] A synergistic flame-retardant and weather-resistant polymer material composed of a TEMP derivative and an inorganic metal compound, with the following raw material ratios:

[0077]

[0078] A preparation method of a synergistic flame-retardant and weather-resistant polymer material composed of a TEMP derivative and an inorganic metal compound, comprising the following steps:

[0079] (1) Place aluminum hydroxide and an amino-silane coupling agent in a high-speed mixer, adjust the rotation speed to 1600 rpm, control the temperature at 90 °C, and mix at high speed for 15 min to obtain a surface-modified aluminum hydroxide flame retardant. Wait until the material temperature of the surface-modified aluminum hydroxide flame retardant drops to 50 °C, then add bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, ammonium polyphosphate, and dilauryl thiodipropionate in the high-speed mixer, and continue to mix at a rotation speed of 1600 rpm for 5 min, and discharge to obtain a premix with a synergistic effect.

[0080] (2) Add the uniformly mixed premix to a twin-screw extruder with a length-to-diameter ratio of 52 through a loss-in-weight feeder from the main feed port, and add polyethylene through a loss-in-weight feeder from the side feed port. Adjust the rotation speed of the twin-screw extruder to 500 rpm, set the temperature range to 150 - 200 °C, the feeding section to 160 - 180 °C, the compression section to 180 - 200 °C, the melting and mixing section to 200 °C, and the die head to 180 °C, and perform extrusion granulation to obtain a highly efficient flame-retardant and weather-resistant polymer material.

[0081] (3) Finally, perform a forming process, and prepare standard flame-retardant, mechanical, and accelerated aging specimens from the melt-blended material through an injection molding process. Conduct strict UL-94, limiting oxygen index (LOI), mechanical property, and anti-aging property tests on the prepared specimens.

[0082] Example 5

[0083] A synergistic flame-retardant and weather-resistant polymer material composed of a TEMP derivative and an inorganic metal compound, with the following raw material ratios:

[0084]

[0085] A preparation method of a synergistic flame-retardant and weather-resistant polymer material composed of a TEMP derivative and an inorganic metal compound, comprising the following steps:

[0086] (1) Put aluminum hydroxide and an amino-silane coupling agent into a high-speed mixer. Adjust the rotation speed to 1600 rpm and control the temperature at 90 °C for high-speed mixing for 15 min to obtain a surface-modified aluminum hydroxide flame retardant. When the material temperature of the surface-modified aluminum hydroxide flame retardant drops to 50 °C, add bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, ammonium polyphosphate, and dilauryl thiodipropionate synergistic auxiliaries into the high-speed mixer, and continue to mix at a rotation speed of 1600 rpm for 5 min, then discharge to obtain a premix with a synergistic effect.

[0087] (2) Add the uniformly mixed premix into a twin-screw extruder with a length-to-diameter ratio of 52 through a loss-in-weight feeder from the main feeding port, and add ethylene-vinyl acetate copolymer through a loss-in-weight feeder from the side feeding port. Adjust the rotation speed of the twin-screw extruder to 350 rpm, set the temperature range at 150 - 200 °C, the feeding section at 160 - 180 °C, the compression section at 180 - 200 °C, the melting and mixing section at 200 °C, and the die head at 180 °C, and carry out extrusion granulation to obtain a highly efficient flame-retardant and weather-resistant polymer material.

[0088] (3) Finally, carry out a forming process, and prepare standard flame-retardant, mechanical, and accelerated aging specimens from the melt-blended material through an injection molding process. Conduct strict UL-94, limiting oxygen index (LOI), mechanical properties, and anti-aging performance tests on the prepared specimens.

[0089] Comparative Example 1

[0090] An inorganic flame-retardant polymer material, with the following raw material ratios:

[0091]

[0092] A preparation method of an inorganic flame-retardant polymer material, comprising the following steps:

[0093] (1) Put magnesium hydroxide, ammonium polyphosphate, and dilauryl thiodipropionate into a high-speed mixer. Adjust the rotation speed to 1600 rpm and control the temperature at 90 °C for high-speed mixing for 15 min. When the material temperature drops to 50 °C, continue to mix at a rotation speed of 1600 rpm for 5 min, then discharge to obtain a flame-retardant premix.

[0094] (2) Add the uniformly mixed premix into a twin-screw extruder with a length-to-diameter ratio of 52 through a loss-in-weight feeder from the main feeding port, and add polypropylene through a loss-in-weight feeder from the side feeding port. Adjust the rotation speed of the twin-screw extruder to 350 rpm, set the temperature range at 150 - 260 °C, the feeding section at 160 - 180 °C, the compression section at 180 - 200 °C, the melting and mixing section at 220 - 260 °C, and the die head at 180 °C, and carry out extrusion granulation to obtain a flame-retardant polymer material.

[0095] (3) Finally, perform the forming process. The material after melt blending is prepared into standard specimens for flame retardancy, mechanical properties, and accelerated aging through an injection molding process. Rigorous tests on UL-94, limiting oxygen index (LOI), mechanical properties, and anti-aging properties are conducted on the prepared specimens.

[0096] Comparative Example 2

[0097] A synergistic flame-retardant and weather-resistant polymer material composed of a TEMP derivative and an inorganic metal compound has the following raw material proportions:

[0098]

[0099]

[0100] A preparation method for a synergistic flame-retardant and weather-resistant polymer material composed of a TEMP derivative and an inorganic metal compound includes the following steps:

[0101] (1) Place magnesium hydroxide and an amino silane coupling agent in a high-speed mixer. Adjust the rotation speed to 1600 rpm and control the temperature at 90 °C for high-speed mixing for 15 min to obtain a surface-modified magnesium hydroxide flame retardant. Wait until the material temperature of the surface-modified magnesium hydroxide flame retardant drops to 50 °C, and then add poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethanol) succinate, ammonium polyphosphate, and dilauryl thiodipropionate in the high-speed mixer. Continue to mix at a rotation speed of 1600 rpm for 5 min, and then discharge the material to obtain a premix with a synergistic effect.

[0102] (2) Add the uniformly mixed premix to a twin-screw extruder with a length-to-diameter ratio of 52 through a loss-in-weight feeder, and add polypropylene through a loss-in-weight feeder from the side feeder. Adjust the rotation speed of the twin-screw extruder to 350 rpm, and set the temperature range to 150 - 260 °C, with the feeding section at 160 - 180 °C, the compression section at 180 - 200 °C, the melting and mixing section at 220 - 260 °C, and the die head at 180 °C. Then, perform extrusion granulation to obtain a highly efficient flame-retardant and weather-resistant polymer material.

[0103] (3) Finally, perform the forming process. The material after melt blending is prepared into standard specimens for flame retardancy, mechanical properties, and accelerated aging through an injection molding process. Rigorous tests on UL-94, limiting oxygen index (LOI), mechanical properties, and anti-aging properties are conducted on the prepared specimens.

[0104] Comparative Example 3

[0105] A synergistic flame-retardant and weather-resistant polymer material composed of a TEMP derivative and an inorganic metal compound has the following raw material proportions:

[0106]

[0107] A preparation method of a synergistic flame-retardant and weather-resistant polymer material with a TEMP derivative and an inorganic metal compound, comprising the following steps:

[0108] (1) Add magnesium hydroxide, poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethanol) succinate, ammonium polyphosphate, and dilauryl thiodipropionate to a high-speed mixer, and mix at 70 °C at a rotation speed of 1600 rpm for 15 min, then discharge to obtain a premix.

[0109] (2) Add the uniformly mixed premix to a twin-screw extruder with a length-diameter ratio of 52 through a loss-in-weight feeder from the main feeding port, and add polypropylene through a loss-in-weight feeder from the side feeding port. Adjust the rotation speed of the twin-screw extruder to 350 rpm, and set the temperature range to 150 - 260 °C, the feeding section to 160 - 180 °C, the compression section to 180 - 200 °C, the melting and mixing section to 220 - 260 °C, and the die head to 180 °C, and carry out extrusion granulation to obtain a highly efficient flame-retardant and weather-resistant polymer material.

[0110] (3) Finally, perform a molding process, and prepare standard flame-retardant, mechanical, and accelerated aging specimens from the melt-blended material through an injection molding process. Conduct strict UL-94, limiting oxygen index (LOI), mechanical property, and anti-aging property tests on the prepared specimens.

[0111] Comparative Example 4

[0112] A synergistic flame-retardant and weather-resistant polymer material with a TEMP derivative and an inorganic metal compound, with the following raw material ratios:

[0113]

[0114] A preparation method of a synergistic flame-retardant and weather-resistant polymer material with a TEMP derivative and an inorganic metal compound, comprising the following steps:

[0115] (1) Place magnesium hydroxide and an amino-silane coupling agent in a high-speed mixer, adjust the rotation speed to 1000 rpm, and control the temperature at 50 °C for high-speed mixing for 5 min to obtain a surface-modified magnesium hydroxide flame retardant. Wait until the material temperature of the surface-modified magnesium hydroxide flame retardant drops to 50 °C, and add poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethanol) succinate, ammonium polyphosphate, and dilauryl thiodipropionate to the high-speed mixer, and continue to mix at a rotation speed of 1000 rpm for 5 min, then discharge to obtain a premix with a synergistic effect.

[0116] (2) The premix that is evenly mixed is added into a twin-screw extruder with a length-diameter ratio of 52 through a loss-in-weight feeder from the main feeding port, and polypropylene is added through a loss-in-weight feeder from the side feeding port. The rotational speed of the twin-screw extruder is adjusted to 350 rpm, and the temperature range is set to 150 - 260 °C, with the feeding section at 160 - 180 °C, the compression section at 180 - 200 °C, the melting and mixing section at 220 - 260 °C, and the die head at 180 °C. Then, extrusion granulation is carried out to obtain a highly efficient flame-retardant and weather-resistant polymer material.

[0117] (3) Finally, a forming treatment is carried out. The melt-blended material is prepared into standard flame-retardant, mechanical, and accelerated aging specimens through an injection molding process. Strict UL-94, limiting oxygen index (LOI), mechanical properties, and anti-aging performance tests are conducted on the prepared specimens.

[0118] Comparative Example 5

[0119] A TEMP derivative and a flame-retardant synergist synergistically flame-retardant and weather-resistant polymer material, with the raw material proportions as follows:

[0120]

[0121] A preparation method of a TEMP derivative and a flame-retardant synergist synergistically flame-retardant and weather-resistant polymer material, comprising the following steps:

[0122] (1) Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, ammonium polyphosphate, and dodecyl thiodipropionate are placed in a high-speed mixer. The rotational speed is adjusted to 1600 rpm, and the temperature is controlled at 90 °C for high-speed mixing for 15 min. Polyethylene resin is added to the high-speed mixer, and mixing is continued at a rotational speed of 1600 rpm for 5 min. Then, the material is discharged to obtain a premix.

[0123] (2) The premix that is evenly mixed is added into a twin-screw extruder with a length-diameter ratio of 52 through a loss-in-weight feeder from the main feeding port, and polypropylene is added through a loss-in-weight feeder from the side feeding port. The rotational speed of the twin-screw extruder is adjusted to 350 rpm, and the temperature range is set to 150 - 220 °C, with the feeding section at 160 - 180 °C, the compression section at 180 - 200 °C, the melting and mixing section at 200 - 220 °C, and the die head at 180 °C. Then, extrusion granulation is carried out to obtain a highly efficient flame-retardant and weather-resistant polymer material.

[0124] (3) Finally, a forming treatment is carried out. The melt-blended material is prepared into standard flame-retardant, mechanical, and accelerated aging specimens through an injection molding process. Strict UL-94, limiting oxygen index (LOI), mechanical properties, and anti-aging performance tests are conducted on the prepared specimens.

[0125] Performance detection:

[0126] The above standard specimens were tested according to the standard. Among them, the accelerated aging test was carried out using UVA 340 fluorescent ultraviolet accelerated aging, and the test standard was ISO 4892-3, with an irradiance of 0.76 W / m 2 .nm. The performance comparison results are shown in the following table.

[0127]

[0128] NR in the table indicates no flame retardant level.

[0129] The results show that the synergistic effect of TEMP derivatives and inorganic metal compounds significantly enhances the flame retardancy and weather resistance of the material, and even maintains a high LOI and tensile strength after aging. This proves the effectiveness of this method. In contrast, the control materials without using this technology perform poorly in terms of flame retardancy, weather resistance and mechanical properties. Further research shows that the synergistic system still maintains a good flame retardant effect after long-term ultraviolet accelerated aging, and there are no obvious aging signs on the material surface, showing excellent comprehensive performance. The experimental data support that the composite application of TEMP derivatives and inorganic metal compounds is an effective technical route for developing high-performance flame retardant and weather resistant polymer materials. In addition, this material has good stability during long-term use and is suitable for a variety of extreme environments, opening up broad prospects for industrial applications.

[0130] It should be noted that the above content only illustrates the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements all fall within the protection scope of the claims of the present invention.

Claims

1. A synergistic flame-retardant and weather-resistant polymer material composed of a TEMP derivative and an inorganic metal compound, characterized in that, The material consists of the following components: the content of the polymer matrix is 38 - 82 wt%, the content of the TEMP derivative is 0.5 - 5 wt%, the content of the oxide or hydroxide flame retardant is 15 - 40 wt%, the content of the silane coupling agent is 0.5 - 2 wt%, and the content of the synergistic auxiliary agent is 0.3 - 15 wt%.

2. The synergistic flame-retardant and weather-resistant polymer material of a TEMP derivative and an inorganic metal compound according to claim 1, characterized in that The polymer matrix is selected from any one of polypropylene, polyethylene, ethylene - vinyl acetate copolymer, polyester, and epoxy resin.

3. The synergistic flame-retardant and weather-resistant polymer material of a TEMP derivative and an inorganic metal compound according to claim 2, wherein The polyester is selected from any one of PET and PBT.

4. A synergistic flame-retardant and weather-resistant polymer material composed of a TEMP derivative and an inorganic metal compound according to claim 1, characterized in that, The TEMP derivative is selected from poly{[6 - [(1,1,3,3 - tetramethylbutyl]amino]-1,3,5 - triazine -2,4 - [(2,2,6,6 - tetramethyl - 4 - piperidyl)imino]-1,6 - hexanediyl[(2,2,6,6 - tetramethyl - 4 - piperidyl)imino]}, poly(4 - hydroxy - 2,2,6,6 - tetramethyl - 1 - piperidylethanol) succinate, bis(2,2,6,6 - tetramethyl - 4 - piperidyl) sebacate, one or more of 1,5,8,12 - tetra(4,6 - bis(n - butyl - n - 1,2,2,6,6 - pentamethyl - 4 - piperidylamino)-1,3,5 - triazin - 2 - yl)-1,5,8,12 - tetraazadodecane.

5. A TEMP derivative and inorganic metal compound synergistic flame-retardant and weather-resistant polymer material according to claim 1, characterized in that The inorganic metal compound is selected from any one of magnesium hydroxide, aluminum hydroxide, zinc oxide, magnesium oxide, aluminum oxide, and layered double hydroxide.

6. The synergistic flame-retardant and weather-resistant polymer material of a TEMP derivative and an inorganic metal compound according to claim 1, wherein The mass ratio of the TEMP derivative to the oxide or hydroxide flame retardant is 1:7 - 1:

70.

7. A TEMP derivative and an inorganic metal compound synergistically flame-retarded weather-resistant polymer material according to claim 1, characterized in that The silane coupling agent is an amino - silane coupling agent, and is selected from any one of 3 - aminopropyltriethoxysilane, highly active bis - amino - trialkoxysilane, N,N - dimethylpropylenediaminepropylmethyldimethoxysilane, anilinopropyltrimethoxysilane, 3 - ureidopropyltriethoxysilane, N - n - butyl - 3 - aminopropyltrimethoxysilane, and N-(2 - aminoethyl)-3 - aminopropylmethyldimethoxysilane.

8. A TEMP derivative and an inorganic metal compound synergistically flame-retardant and weather-resistant polymer material according to claim 1, characterized in that, The synergistic auxiliary agent is selected from one or more of a phosphorus - based flame retardant, a silicon - based flame retardant, a sulfur - based antioxidant, and a carbon source enhancer.

9. A synergistic flame-retardant and weather-resistant polymer material of a TEMP derivative and an inorganic metal compound according to claim 8, characterized in that, The phosphorus - based flame retardant is selected from one or several of ammonium polyphosphate, red phosphorus, and triphenyl phosphate; the silicon - based flame retardant is selected from one or several of montmorillonite, kaolin, wollastonite, and organosilicon; the sulfur - based antioxidant is dilauryl thiodipropionate; and the carbon source enhancer is pentaerythritol or a triazine carbon - forming agent.

10. A method for preparing a synergistic flame-retardant and weather-resistant polymer material by using a TEMP derivative as described in any one of claims 1-9 and an inorganic metal compound, characterized in that, It includes the following steps: (1) Place the oxide or hydroxide flame retardant and the amino - silane coupling agent in a high - speed mixer, adjust the rotation speed to 1500 - 2000 rpm, control the temperature at 80 - 100 °C, and mix at high speed for 15 min to obtain a surface - modified flame retardant. When the material temperature of the surface - modified flame retardant drops to 50 °C, add the TEMP derivative and the synergistic auxiliary agent to the high - speed mixer, and continue to mix at a rotation speed of 1500 - 2000 rpm for 5 min, then discharge to obtain a premix with a synergistic effect; (2) Add the premix that has been evenly mixed into a twin-screw extruder with a length-diameter ratio of 52 through a loss-in-weight feeder. The polymer matrix is added through a side feeder using a loss-in-weight feeder. Adjust the rotational speed of the twin-screw extruder to 350 - 500 rpm and set the temperature range to 150 - 260 °C, then carry out extrusion granulation to obtain a highly flame-retardant and weather-resistant polymer material.

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