Halogen-containing flame-retardant weather-resistant polyethylene composition as well as preparation and application thereof

Abstract

The invention relates to the technical field of magnesium alloys, in particular to a halogen-containing flame-retardant weather-resistant polyethylene composition as well as preparation and application thereof. The halogen-containing flame-retardant weather-resistant polyethylene composition comprises the following raw materials in parts by weight: 60-80 parts of polyethylene, 20-30 parts of an inorganic flame retardant, 10-20 parts of a halogen-containing flame retardant, 6-12 parts of filler, 2-4 parts of a lubricant, 2-4 parts of an additive and 1-3 parts of an antioxidant. In the invention, after the bamboo fiber, sepiolite, aloe oil and flax fiber adopted in the filler are matched and prepared, a link structure can be formed in the structure of the polyethylene composition by utilizing the rich fiber structure in the bamboo fiber, and the link structure is matched with the crude fiber of the flax fiber to further play a role in enhancing; the sepiolite can be filled in the bamboo fibers and the linen fibers to play a role in absorbing ultraviolet rays, so that the polyethylene composition is unlikely to be damaged due to ultraviolet irradiation in a weather-proof process under the action of structure enhancement.

Description

Technical Field

[0001] The invention relates to the technical field of magnesium alloys, in particular to a halogen-containing flame-retardant and weather-resistant polyethylene composition and a preparation method and application thereof. Background Art

[0002] The flame-retardant and weather-resistant polyethylene composition is made of polyethylene as the matrix with the addition of flame retardants, light stabilizers and other additives. It can effectively prevent combustion, delay the spread of flames, and improve fire resistance. It is widely used in the fields of wires and cables.

[0003] In the prior art, polyethylene compositions need to be coated and used outdoors for a long time. However, under the condition of long-term use, long-term ultraviolet radiation will cause cracking and damage to the surface of the material, making it impossible to effectively protect the coated object, affecting the flame retardant protection effect of the coated object. Based on this, the present invention provides a halogen-containing flame-retardant and weather-resistant polyethylene composition and its preparation and application. Summary of the invention

[0004] The purpose of the present invention is to provide a halogen-containing flame-retardant and weather-resistant polyethylene composition and its preparation and application. The halogen-containing flame-retardant and weather-resistant polyethylene composition prepared by the present invention has good aging resistance and effectively improves the use performance of the halogen-containing flame-retardant and weather-resistant polyethylene composition.

[0005] To achieve the above object, the present invention provides the following technical solution: a halogen flame retardant weather-resistant polyethylene composition, comprising the following raw materials in parts by weight: 60 to 80 parts of polyethylene, 20 to 30 parts of inorganic flame retardant, 10 to 20 parts of halogen flame retardant, 6 to 12 parts of filler, 2 to 4 parts of lubricant, 2 to 4 parts of additives and 1 to 3 parts of antioxidant; The raw materials of the filler are composed of bamboo fiber, sepiolite, aloe oil and flax fiber, and the mass ratio of the bamboo fiber, sepiolite, aloe oil and flax fiber is 1: (0.8-1.2): (0.6-0.8): (0.4-0.6); The raw materials of the additive are carbon nanotubes, montmorillonite, nanocellulose and additives, and the mass ratio of the carbon nanotubes, montmorillonite, nanocellulose and additives is 1: (0.4-0.6): (0.6-0.8): (0.1-0.3).

[0006] Furthermore, the bamboo fiber and the flax fiber are pretreated, and the pretreatment method of the bamboo fiber and the flax fiber is as follows: the bamboo fiber and the flax fiber are scattered and sent into an oven, the oven is set at 40-50° C. for drying for 20-30 minutes, and then they are cut and ground into powder with a particle size of 80-100 μm. The obtained powder and aloe vera oil are added into a mixer, and the mixer is set at 200-300 r / min for stirring for 8-12 minutes to obtain a first mixture.

[0007] Furthermore, the sepiolite is powdered material with a particle size of 80 to 100 μm.

[0008] Furthermore, the filler is prepared by the following method: a first mixture and sepiolite are added to a mixer, the mixer is set at 120-160 r / min and stirred for 10-20 minutes to obtain a second mixture, the second mixture is sent to an oven, the oven is set at 40-50° C. and dried for 20-30 minutes, and then crushed and ground into powder with a particle size of 40-80 μm to obtain a filler.

[0009] Furthermore, the additive is prepared by the following method: tributylamine and phosphate are added to a reactor, methanol is added to the reactor, the mass of the methanol is 12 to 14 times the mass of the tributylamine, the mass ratio of the tributylamine to the phosphate is 1:(1.2 to 1.4), the reactor is set to heat up to 60 to 80°C, the stirring speed is 40 to 80r / min, the heat preservation and stirring treatment is carried out for 4 to 6 hours, and then washing and filtering are carried out, and the reactor is sent to an oven set at 50 to 70°C for drying for 40 to 60 minutes to prepare the additive.

[0010] Furthermore, the additive is prepared by the following method: montmorillonite and deionized water are mixed and added into a mixer, the mass of the deionized water is 20-30% of the mass of the montmorillonite, the mixer is set at 120-160 r / min and stirred for 8-12 minutes, then carbon nanotubes, nanocellulose and additives are added into the mixer, and the mixer is set at 300-400 r / min and stirred for 20-30 minutes to prepare the additive.

[0011] Furthermore, the polyethylene is selected from high-density polyethylene, the inorganic flame retardant is selected from any one of magnesium hydroxide, aluminum hydroxide, and zinc borate, and the halogenated flame retardant is selected from any one of decabromodiphenyl ether, chlorinated paraffin, and hexabromocyclododecane.

[0012] Furthermore, the lubricant is selected from any one of butyl stearate, glyceryl tristearate, and oleamide, and the antioxidant is selected from any one of rosin pentaerythritol ester and phosphite.

[0013] Furthermore, a method for preparing a halogen-containing flame-retardant and weather-resistant polyethylene composition comprises the following steps: S1: polyethylene, inorganic flame retardant, halogen flame retardant, lubricant and antioxidant are weighed as needed and added into a mixer, and the mixer is set at 800-1000 r / min for stirring for 6-8 minutes to obtain a third mixture; S2: The third mixed material is fed into an internal mixer, the internal mixer is set at 140-180°C, 40-60r / min, and mixing is performed for 16-22min. Fillers and additives are added into the internal mixer, the internal mixer is set at 160-200°C, 80-100r / min, and mixing is performed for 12-16min. The obtained product is fed into a twin-screw extruder, the twin-screw extruder is set at 120-220r / min, the temperature is 140-240°C, and after extrusion, it is cooled and granulated to obtain a halogenated flame-retardant and weather-resistant polyethylene composition.

[0014] Furthermore, an application of a halogen-containing flame-retardant and weather-resistant polyethylene composition is provided, wherein the halogen-containing flame-retardant and weather-resistant polyethylene composition is used for flame-retardant coating of electric wires, cables and optical cables.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, fillers are added in the preparation of the polyethylene composition. After the bamboo fiber, sepiolite, aloe oil and flax fiber used in the filler are prepared in combination, the rich fiber structure of the bamboo fiber can form a link structure in the structure of the polyethylene composition, and further play a reinforcing role when combined with the crude fiber of the flax fiber. The sepiolite can be filled in the bamboo fiber and the flax fiber to absorb ultraviolet rays. Under the effect of structural reinforcement, the polyethylene composition is not easily damaged by ultraviolet radiation during the weathering process.

[0016] 2. In the present invention, additives are added, wherein the light absorbing ability of carbon nanotubes is utilized to absorb and scatter light. At the same time, carbon nanotubes have good thermal stability, which can make the polyethylene composition heated more evenly when used outdoors, thereby improving the overall thermal stability of the material, and further improving the weather resistance of the material. At the same time, montmorillonite and nanocellulose can play a role in synergistic structural reinforcement, so that the polyethylene composition can dissipate heat faster in a high temperature environment, reduce thermal damage during the use of the polyethylene composition, and further improve the weather resistance of the material.

[0017] 3. In the present invention, an ionic liquid is prepared by adding additives in the preparation of the polyethylene composition, and tributylamine and a phosphate are mixed. The ionic liquid can produce a synergistic effect with the halogenated flame retardant. When combustion occurs at the location where the material is used, the ionic liquid can promote carbonization of the material surface and inhibit the combustion reaction, thereby improving the flame retardant properties of the polyethylene composition. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] It should be noted that the raw materials used in the following examples are all commercially available raw materials. Embodiment 1:

[0020] A halogen flame-retardant and weather-resistant polyethylene composition comprises the following raw materials in parts by weight: 60 parts of polyethylene, 20 parts of inorganic flame retardant, 10 parts of halogen flame retardant, 6 parts of filler, 2 parts of lubricant, 2 parts of additive and 1 part of antioxidant; The raw materials of the filler are composed of bamboo fiber, sepiolite, aloe oil and flax fiber, and the mass ratio of bamboo fiber, sepiolite, aloe oil and flax fiber is 1: (0.8): (0.6): (0.4); The raw materials of the additive are carbon nanotubes, montmorillonite, nanocellulose and additives, and the mass ratio of the carbon nanotubes, montmorillonite, nanocellulose and additives is 1: (0.4): (0.6): (0.1).

[0021] The bamboo fiber and the flax fiber are pretreated. The pretreatment method of the bamboo fiber and the flax fiber is as follows: the bamboo fiber and the flax fiber are scattered and sent into an oven, the oven is set at 40° C. for drying for 20 minutes, and then they are cut and ground into powder with a particle size of 80 μm. The obtained powder and aloe vera oil are added into a mixer, and the mixer is set at 200 r / min for stirring for 8 minutes to obtain a first mixture.

[0022] The sepiolite is powdered material with a particle size of 80 μm.

[0023] The filler is prepared by the following method: the first mixture and sepiolite are added to a mixer, the mixer is set at 120r / min and stirred for 10 minutes to obtain a second mixture, the second mixture is sent to an oven, the oven is set at 40°C and dried for 20 minutes, and then crushed and ground into powder with a particle size of 40μm to obtain a filler.

[0024] The additive is prepared by the following method: tributylamine and phosphate are added to a reactor, methanol is added to the reactor, the mass of methanol is 12 times the mass of tributylamine, the mass ratio of tributylamine to phosphate is 1:(1.2), the reactor is set to heat up to 60°C, the stirring speed is 40r / min, the heat preservation and stirring treatment is carried out for 4h, then washing and filtering are carried out, and the reactor is sent to an oven set at 50°C for drying for 40min to prepare the additive.

[0025] The additive is prepared by the following method: montmorillonite and deionized water are mixed and added into a mixer, the mass of the deionized water is 20% of the mass of the montmorillonite, the mixer is set at 120 r / min and stirred for 8 minutes, then carbon nanotubes, nanocellulose and additives are added into the mixer, and the mixer is set at 300 r / min and stirred for 20 minutes to prepare the additive.

[0026] The polyethylene selected is high-density polyethylene, the inorganic flame retardant selected is magnesium hydroxide, and the halogenated flame retardant selected is decabromodiphenyl ether.

[0027] Butyl stearate is used as lubricant and pentaerythritol rosin is used as antioxidant.

[0028] A method for preparing a halogen-containing flame-retardant and weather-resistant polyethylene composition comprises the following steps: S1: polyethylene, inorganic flame retardant, halogen flame retardant, lubricant and antioxidant are weighed as needed and added into a mixer, and the mixer is set to 800 r / min and stirred for 6 minutes to obtain a third mixture; S2: The third mixed material is fed into an internal mixer, the internal mixer is set at 140°C, 40r / min, and mixing is performed for 16min. Fillers and additives are added into the internal mixer, the internal mixer is set at 160°C, 80r / min, and mixing is performed for 12min. The obtained product is fed into a twin-screw extruder, the twin-screw extruder is set at 120r / min, the temperature is 140°C, and after extrusion, it is cooled and granulated to obtain a halogen-containing flame-retardant and weather-resistant polyethylene composition. Embodiment 2:

[0029] A halogen flame-retardant and weather-resistant polyethylene composition comprises the following raw materials in parts by weight: 70 parts of polyethylene, 25 parts of inorganic flame retardant, 15 parts of halogen flame retardant, 9 parts of filler, 3 parts of lubricant, 3 parts of additive and 2 parts of antioxidant; The raw materials of the filler are composed of bamboo fiber, sepiolite, aloe oil and flax fiber, and the mass ratio of bamboo fiber, sepiolite, aloe oil and flax fiber is 1: (1): (0.7): (0.5); The raw materials of the additive are carbon nanotubes, montmorillonite, nanocellulose and additives, and the mass ratio of the carbon nanotubes, montmorillonite, nanocellulose and additives is 1: (0.5): (0.7): (0.2).

[0030] The bamboo fiber and the flax fiber are pretreated. The pretreatment method of the bamboo fiber and the flax fiber is as follows: the bamboo fiber and the flax fiber are scattered and sent into an oven, the oven is set at 45° C. for drying for 25 minutes, and then they are cut and ground into powder with a particle size of 90 μm. The obtained powder and aloe vera oil are added into a mixer, and the mixer is set at 250 r / min for stirring for 10 minutes to obtain a first mixture.

[0031] The sepiolite is powdered material with a particle size of 90 μm.

[0032] The filler is prepared by the following method: the first mixture and sepiolite are added to a mixer, the mixer is set at 140r / min and stirred for 15 minutes to obtain a second mixture, the second mixture is sent to an oven, the oven is set at 45°C and dried for 25 minutes, and then crushed and ground into powder with a particle size of 60μm to obtain the filler.

[0033] The additive is prepared by the following method: tributylamine and phosphate are added to a reactor, methanol is added to the reactor, the mass of methanol is 13 times the mass of tributylamine, the mass ratio of tributylamine to phosphate is 1:(1.3), the reactor is set to be heated to 70°C, the stirring speed is 60r / min, the heat preservation and stirring treatment is carried out for 5 hours, and then washing and filtering are carried out, and the reactor is sent to an oven set at 60°C for drying for 50 minutes to prepare the additive.

[0034] The additive is prepared by the following method: montmorillonite and deionized water are mixed and added into a mixer, the mass of the deionized water is 25% of the mass of the montmorillonite, the mixer is set at 140r / min and stirred for 10 minutes, then carbon nanotubes, nanocellulose and additives are added into the mixer, and the mixer is set at 350r / min and stirred for 25 minutes to prepare the additive.

[0035] The polyethylene selected is high-density polyethylene, the inorganic flame retardant selects aluminum hydroxide, and the halogenated flame retardant selects chlorinated paraffin.

[0036] The lubricant is glyceryl tristearate, and the antioxidant is phosphite.

[0037] A method for preparing a halogen-containing flame-retardant and weather-resistant polyethylene composition comprises the following steps: S1: polyethylene, inorganic flame retardant, halogen flame retardant, lubricant and antioxidant are weighed as needed and added into a mixer, and the mixer is set at 900 r / min and stirred for 7 minutes to obtain a third mixture; S2: The third mixed material is fed into an internal mixer, the internal mixer is set at 160°C, 50r / min, and mixing is carried out for 20min. Fillers and additives are added into the internal mixer, the internal mixer is set at 180°C, 90r / min, and mixing is carried out for 14min. The obtained product is fed into a twin-screw extruder, the twin-screw extruder is set at 170r / min, the temperature is 190°C, and after extrusion, it is cooled and granulated to obtain a halogen-containing flame-retardant and weather-resistant polyethylene composition. Embodiment three:

[0038] A halogen flame-retardant and weather-resistant polyethylene composition comprises the following raw materials in parts by weight: 80 parts of polyethylene, 30 parts of inorganic flame retardant, 20 parts of halogen flame retardant, 12 parts of filler, 4 parts of lubricant, 4 parts of additive and 3 parts of antioxidant; The raw materials of the filler are composed of bamboo fiber, sepiolite, aloe oil and flax fiber, and the mass ratio of bamboo fiber, sepiolite, aloe oil and flax fiber is 1: (1.2): (0.8): (0.6); The raw materials of the additive are carbon nanotubes, montmorillonite, nanocellulose and additives, and the mass ratio of the carbon nanotubes, montmorillonite, nanocellulose and additives is 1: (0.6): (0.8): (0.3).

[0039] The bamboo fiber and the flax fiber are pretreated. The pretreatment method of the bamboo fiber and the flax fiber is as follows: the bamboo fiber and the flax fiber are scattered and sent into an oven, the oven is set at 50° C. for drying for 30 minutes, and then they are cut and ground into powder with a particle size of 100 μm. The obtained powder and aloe vera oil are added into a mixer, and the mixer is set at 300 r / min for stirring for 12 minutes to obtain a first mixture.

[0040] The sepiolite is powdered material with a particle size of 100 μm.

[0041] The filler is prepared by the following method: the first mixture and sepiolite are added to a mixer, the mixer is set at 160r / min and stirred for 20 minutes to obtain a second mixture, the second mixture is sent to an oven, the oven is set at 50°C and dried for 30 minutes, and then crushed and ground into powder with a particle size of 80μm to obtain the filler.

[0042] The additive is prepared by the following method: tributylamine and phosphate are added to a reactor, methanol is added to the reactor, the mass of methanol is 14 times the mass of tributylamine, the mass ratio of tributylamine to phosphate is 1:(1.4), the reactor is set to be heated to 80°C, the stirring speed is 80r / min, the heat preservation and stirring treatment is carried out for 6 hours, then washing and filtering are carried out, and the reactor is sent to an oven set at 70°C for drying for 60 minutes to prepare the additive.

[0043] The additive is prepared by the following method: montmorillonite and deionized water are mixed and added into a mixer, the mass of the deionized water is 30% of the mass of the montmorillonite, the mixer is set at 160r / min and stirred for 12 minutes, then carbon nanotubes, nanocellulose and additives are added into the mixer, and the mixer is set at 400r / min and stirred for 30 minutes to prepare the additive.

[0044] The polyethylene selected is high-density polyethylene, the inorganic flame retardant selected is zinc borate, and the halogenated flame retardant selected is hexabromocyclododecane.

[0045] Oleic acid amide is used as lubricant and phosphite is used as antioxidant.

[0046] A method for preparing a halogen-containing flame-retardant and weather-resistant polyethylene composition comprises the following steps: S1: polyethylene, inorganic flame retardant, halogen flame retardant, lubricant and antioxidant are weighed as needed and added into a mixer, and the mixer is set to stir at 1000 r / min for 8 minutes to obtain a third mixture; S2: The third mixed material is fed into an internal mixer, the internal mixer is set at 180°C, 60r / min, and mixing is performed for 22min. Fillers and additives are added into the internal mixer, the internal mixer is set at 200°C, 100r / min, and mixing is performed for 16min. The obtained product is fed into a twin-screw extruder, the twin-screw extruder is set at 220r / min, the temperature is 240°C, and after extrusion, it is cooled and granulated to obtain a halogen-containing flame-retardant and weather-resistant polyethylene composition.

[0047] Comparative Example 1: The difference between this comparative example and Example 1 is that this comparative example does not contain an antioxidant.

[0048] Comparative Example 2: The difference between this comparative example and Example 1 is that this comparative example does not contain any additive.

[0049] Comparative Example 3: The difference between this comparative example and Example 1 is that this comparative example does not contain filler.

[0050] Comparative Example 4: The difference between this comparative example and Example 1 is that this comparative example does not contain fillers and additives.

[0051] Performance test: The halogen flame retardant and weather resistant polyethylene compositions treated in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were subjected to performance tests, and the test data obtained are recorded in the following table:

[0052] In the performance test, the halogen flame retardant and weather-resistant polyethylene compositions treated in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were tested for tensile strength and elongation at break. After the test, ultraviolet irradiation was performed to simulate outdoor aging conditions. The irradiation was performed using a UVA lamp with a wavelength of 340 nm and a light intensity of 1 W / m 2 The irradiation time is 30d. After the irradiation is completed, the halogen-containing flame-retardant and weather-resistant polyethylene compositions treated in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 are again tested for tensile strength and elongation at break.

[0053] It can be seen that the performance degradation data of the halogen-containing flame-retardant and weather-resistant polyethylene compositions prepared in Comparative Examples 1, 2, 3 and 4 after completing the simulated aging are all lower than those in Examples 1, 2 and 3; this indicates that: by adding fillers in the preparation of the polyethylene composition, the bamboo fiber, sepiolite, aloe oil and flax fiber used in the filler are combined to complete the preparation, and the rich fiber structure in the bamboo fiber can form a link structure in the structure of the polyethylene composition, and further play a reinforcing role in combination with the crude fiber of the flax fiber. The sepiolite can be filled in the bamboo fiber and the flax fiber to absorb ultraviolet rays. Under the effect of structural reinforcement, the polyethylene composition is not easily damaged by ultraviolet radiation during the weathering process.

[0054] By comparing and analyzing the relevant data in the table, it can be seen that the halogen flame retardant weather-resistant polyethylene composition prepared by the present invention has good aging resistance. This shows that the halogen flame retardant weather-resistant polyethylene composition provided by the present invention and its preparation and application have broader market prospects and are more suitable for promotion.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A halogen-containing flame-retardant and weather-resistant polyethylene composition, characterized in that: The invention comprises the following raw materials in parts by weight: 60 to 80 parts of polyethylene, 20 to 30 parts of inorganic flame retardant, 10 to 20 parts of halogen flame retardant, 6 to 12 parts of filler, 2 to 4 parts of lubricant, 2 to 4 parts of additive and 1 to 3 parts of antioxidant; The raw materials of the filler are composed of bamboo fiber, sepiolite, aloe oil and flax fiber, and the mass ratio of the bamboo fiber, sepiolite, aloe oil and flax fiber is 1: (0.8-1.2): (0.6-0.8): (0.4-0.6); The raw materials of the additive are carbon nanotubes, montmorillonite, nanocellulose and additives, and the mass ratio of the carbon nanotubes, montmorillonite, nanocellulose and additives is 1: (0.4-0.6): (0.6-0.8): (0.1-0.3).

2. The halogen-containing flame-retardant and weather-resistant polyethylene composition according to claim 1, characterized in that: The bamboo fiber and the flax fiber are pretreated, and the pretreatment method of the bamboo fiber and the flax fiber is as follows: the bamboo fiber and the flax fiber are scattered and sent into an oven, the oven is set at 40-50° C. for drying for 20-30 minutes, and then they are cut and ground into powder, the powder particle size is 80-100 μm, the obtained powder and aloe vera oil are added into a mixer, the mixer is set at 200-300 r / min for stirring for 8-12 minutes, and a first mixture is obtained.

3. The halogen-containing flame-retardant and weather-resistant polyethylene composition according to claim 1, characterized in that: The sepiolite is powdered material with a particle size of 80 to 100 μm.

4. The halogen-containing flame-retardant and weather-resistant polyethylene composition according to claim 2, characterized in that: The filler is prepared by the following method: a first mixture and sepiolite are added to a mixer, the mixer is set at 120-160 r / min and stirred for 10-20 minutes to obtain a second mixture, the second mixture is sent to an oven, the oven is set at 40-50° C. and dried for 20-30 minutes, and then crushed and ground to obtain a filler with a particle size of 40-80 μm.

5. The halogen-containing flame-retardant and weather-resistant polyethylene composition according to claim 1, characterized in that: The additive is prepared by the following method: tributylamine and phosphate are added into a reaction kettle, methanol is added into the reaction kettle, the mass of the methanol is 12 to 14 times the mass of the tributylamine, the mass ratio of the tributylamine to the phosphate is 1:(1.2 to 1.4), the temperature of the reaction kettle is set to 60 to 80°C, the stirring speed is 40 to 80 r / min, the temperature is kept and stirred for 4 to 6 hours, then washing and filtering are carried out, and the reaction kettle is sent into an oven set at 50 to 70°C for drying for 40 to 60 minutes to prepare the additive.

6. The halogen-containing flame-retardant and weather-resistant polyethylene composition according to claim 1, characterized in that: The additive is prepared by the following method: montmorillonite and deionized water are mixed and added into a mixer, the mass of the deionized water is 20-30% of the mass of the montmorillonite, the mixer is set at 120-160 r / min and stirred for 8-12 minutes, then carbon nanotubes, nanocellulose and additives are added into the mixer, the mixer is set at 300-400 r / min and stirred for 20-30 minutes to prepare the additive.

7. The halogen-containing flame-retardant and weather-resistant polyethylene composition according to claim 1, characterized in that: The polyethylene is selected from high-density polyethylene, the inorganic flame retardant is selected from any one of magnesium hydroxide, aluminum hydroxide, and zinc borate, and the halogenated flame retardant is selected from any one of decabromodiphenyl ether, chlorinated paraffin, and hexabromocyclododecane.

8. The halogen-containing flame-retardant and weather-resistant polyethylene composition according to claim 1, characterized in that: The lubricant is selected from any one of butyl stearate, glyceryl tristearate, and oleamide, and the antioxidant is selected from any one of rosin pentaerythritol ester and phosphite.

9. A method for preparing the halogen-containing flame-retardant and weather-resistant polyethylene composition according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: polyethylene, inorganic flame retardant, halogen flame retardant, lubricant and antioxidant are weighed as needed and added into a mixer, and the mixer is set at 800-1000 r / min for stirring for 6-8 minutes to obtain a third mixture; S2: The third mixed material is fed into an internal mixer, the internal mixer is set at 140-180°C, 40-60r / min, and mixing is performed for 16-22min. Fillers and additives are added into the internal mixer, the internal mixer is set at 160-200°C, 80-100r / min, and mixing is performed for 12-16min. The obtained product is fed into a twin-screw extruder, the twin-screw extruder is set at 120-220r / min, the temperature is 140-240°C, and after extrusion, it is cooled and granulated to obtain a halogenated flame-retardant and weather-resistant polyethylene composition.

10. An application of the halogen-containing flame-retardant and weather-resistant polyethylene composition according to claim 9, characterized in that: The halogen-containing flame-retardant and weather-resistant polyethylene composition is used for flame-retardant coating of electric wires, cables and optical cables.

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