Low-smoke halogen-free irradiation cross-linked polyolefin flame retardant material suitable for high-speed extrusion and preparation method of low-smoke halogen-free irradiation cross-linked polyolefin flame retardant material

Abstract

The invention discloses a low-smoke halogen-free irradiation crosslinking polyolefin flame retardant material suitable for high-speed extrusion and a preparation method thereof. The flame retardant material is prepared from a component A and a component B, the component A comprises the following components: carboxylated polyolefin, a flame retardant, an antioxidant, a lubricant, a compatilizer, a drying agent and silanol; the component B comprises the following components: nano kaolinite, a surfactant, a flame retardant, color master batches, an antioxidant, a lubricant and a drying agent. According to the flame-retardant material disclosed by the invention, hydroxyl groups in the nano kaolinite can react with hydroxyl groups in silanol, and the hydroxyl groups in the nano kaolinite can also react with carboxyl groups in carboxylated polyolefin, so that the flame-retardant material integrates the advantages of the nano kaolinite, the silanol and the polyolefin, and the heat resistance, the heat insulation property, the flame retardance and the mechanical property can be improved; the flame retardant is prepared from modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate, the flame retardance of the flame retardant can be further improved, the overall preparation process is simple, and the flame retardant has high application value.

Description

Technical Field

[0001] The invention belongs to the technical field of cables, and in particular relates to a low-smoke halogen-free radiation cross-linked polyolefin flame retardant suitable for high-speed extrusion and a preparation method thereof. Background Art

[0002] With the continuous development of solar photovoltaic power generation technology, the application of photovoltaic cables has become more extensive, and the demand for photovoltaic cable materials has also increased. At present, the existing photovoltaic cable materials are mainly prepared from polyolefin resins, flame retardants, antioxidants, etc. Although the heat resistance and flame retardancy of photovoltaic cable materials have been improved to a certain extent, there is still a lot of room for improvement. Summary of the invention

[0003] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a low-smoke halogen-free radiation cross-linked polyolefin flame retardant suitable for high-speed extrusion and a preparation method thereof.

[0004] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:

[0005] A low-smoke halogen-free radiation cross-linked polyolefin flame retardant suitable for high-speed extrusion, wherein the raw materials for preparing the low-smoke halogen-free radiation cross-linked polyolefin flame retardant include component A and component B;

[0006] The A component includes the following components in parts by weight:

[0007] Carboxylated polyolefin 25-50 parts

[0008] Flame retardant 20-40 parts

[0009] Antioxidant 0.3-0.5 parts

[0010] Lubricant 0.3-1.5 parts

[0011] Compatibilizer 2-7 parts

[0012] 3-8 parts of desiccant

[0013] 1-10 parts of silanol;

[0014] The B component includes the following components in parts by weight:

[0015] Nano kaolinite 1-15 parts

[0016] Surfactant 2-8 parts

[0017] Flame retardant 15-25 parts

[0018] Masterbatch 1-3 parts

[0019] Antioxidant 0.2-0.5 parts

[0020] Lubricant 0.2-0.5 parts

[0021] 3-8 parts of desiccant.

[0022] Furthermore, the weight ratio of component A to component B is controlled at 1-5:2-8.

[0023] Furthermore, the flame retardant is prepared by modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate.

[0024] Furthermore, the modified hydrotalcite is a hydrotalcite with a carboxyl group prepared by acidifying hydrotalcite with sulfuric acid or hydrochloric acid.

[0025] Furthermore, the modified zinc oxide is nano zinc oxide with hydroxyl groups prepared by hydroxylating nano zinc oxide.

[0026] Furthermore, the weight ratio of the modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate is 1-4:1-5:2-3.

[0027] Furthermore, the lubricant is one or a combination of polyethylene wax, silicone, and zinc stearate.

[0028] Furthermore, the compatibilizer is at least one of polyethylene grafted with maleic anhydride and ethylene-vinyl acetate grafted with maleic anhydride.

[0029] The present invention also discloses a method for preparing a low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion, comprising the following steps:

[0030] 1) Preparation of component A:

[0031] By weight, 25-50 parts of carboxylated polyolefin, 20-40 parts of flame retardant, 0.3-0.5 parts of antioxidant, 0.3-1.5 parts of lubricant, 2-7 parts of compatibilizer, and 3-8 parts of desiccant are added into a high-speed mixer and mixed evenly, and then 1-10 parts of silanol are added, mixed evenly, and dried to obtain the desired component A;

[0032] 2) Preparation of component B:

[0033] By weight, 1-15 parts of nano-kaolinite, 2-8 parts of surfactant, 15-25 parts of flame retardant, 1-3 parts of masterbatch, 0.2-0.5 parts of antioxidant, 0.2-0.5 parts of lubricant, and 3-8 parts of desiccant are added into a high-speed mixer and mixed evenly, and the required B component can be obtained after drying;

[0034] 3) Component A and component B are mixed evenly according to the weight ratio, and then placed in an internal mixer, and subjected to high temperature and high pressure shearing and internal mixing for 5-20 minutes, and then sent to a twin-screw extruder for extrusion granulation, and the particles are packaged after cooling and screening.

[0035] Furthermore, the stirring rate of the high-speed stirrer is 260-350 r / min, the stirring time is 3-30 min, and the process temperature of the twin-screw extruder is 190-205° C.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The invention discloses a low-smoke halogen-free radiation cross-linked polyolefin flame retardant suitable for high-speed extrusion and a preparation method thereof. The raw materials for preparing the low-smoke halogen-free radiation cross-linked polyolefin flame retardant include component A and component B; component A includes the following components in parts by weight: 25-50 parts of carboxylated polyolefin, 20-40 parts of flame retardant, 0.3-0.5 parts of antioxidant, 0.3-1.5 parts of lubricant, 2-7 parts of compatibilizer, 3-8 parts of desiccant and 1-10 parts of silanol; component B includes the following components in parts by weight: 1-15 parts of nano-kaolinite, 2-8 parts of surfactant, 15-25 parts of flame retardant, 1-3 parts of masterbatch, 0.2-0.5 parts of antioxidant, 0.2-0.5 parts of lubricant and 3-8 parts of desiccant. In the present invention, the hydroxyl groups in the nano-kaolinite can react with the hydroxyl groups in the silanol to form a network structure, and the hydroxyl groups in the nano-kaolinite can also react with the carboxyl groups in the carboxylated polyolefin to enhance the binding force. The prepared flame retardant material integrates the advantages of nano-kaolinite, silanol and polyolefin, and has improved heat resistance, aging resistance, heat insulation, flame retardancy and mechanical properties. The flame retardant is prepared by modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate. The modified hydrotalcite and modified zinc oxide can react with each other to enhance the binding force and further improve the flame retardancy of the flame retardant material. The flame retardant material is low in smoke and environmentally friendly, does not contain halogens, heavy metals and other substances harmful to the environment, has a simple overall preparation process, has low requirements on irradiation conditions, is low in cost, can meet the needs of high-speed production, and can ensure that the surface of the finished product is free of abnormalities and has qualified physical properties, and has great promotion and application value. DETAILED DESCRIPTION

[0038] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0039] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0040] The invention discloses a low-smoke halogen-free radiation cross-linked polyolefin flame retardant suitable for high-speed extrusion, wherein the raw materials for preparing the low-smoke halogen-free radiation cross-linked polyolefin flame retardant include component A and component B;

[0041] Component A includes the following components in parts by weight:

[0042] Carboxylated polyolefin 25-50 parts

[0043] Flame retardant 20-40 parts

[0044] Antioxidant 0.3-0.5 parts

[0045] Lubricant 0.3-1.5 parts

[0046] Compatibilizer 2-7 parts

[0047] 3-8 parts of desiccant

[0048] 1-10 parts of silanol;

[0049] Component B includes the following components in parts by weight:

[0050] Nano kaolinite 1-15 parts

[0051] Surfactant 2-8 parts

[0052] Flame retardant 15-25 parts

[0053] Masterbatch 1-3 parts

[0054] Antioxidant 0.2-0.5 parts

[0055] Lubricant 0.2-0.5 parts

[0056] 3-8 parts of desiccant.

[0057] The weight ratio of component A to component B is controlled at 1-5:2-8.

[0058] The flame retardant is prepared by modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate, wherein the weight ratio of the modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate is 1-4:1-5:2-3. The modified hydrotalcite is a hydrotalcite with a carboxyl group prepared by acidifying the hydrotalcite with sulfuric acid or hydrochloric acid. The modified zinc oxide is a nano zinc oxide with a hydroxyl group prepared by hydroxylating nano zinc oxide.

[0059] The lubricant is one or a combination of polyethylene wax, silicone and zinc stearate.

[0060] The compatibilizer is at least one of polyethylene grafted maleic anhydride and ethylene-vinyl acetate grafted maleic anhydride.

[0061] The present invention also discloses a method for preparing a low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion, comprising the following steps:

[0062] 1) Preparation of component A:

[0063] By weight, 25-50 parts of carboxylated polyolefin, 20-40 parts of flame retardant, 0.3-0.5 parts of antioxidant, 0.3-1.5 parts of lubricant, 2-7 parts of compatibilizer, and 3-8 parts of desiccant are added into a high-speed mixer and mixed evenly, and then 1-10 parts of silanol are added, mixed evenly, and dried to obtain the desired component A;

[0064] 2) Preparation of component B:

[0065] By weight, 1-15 parts of nano-kaolinite, 2-8 parts of surfactant, 15-25 parts of flame retardant, 1-3 parts of masterbatch, 0.2-0.5 parts of antioxidant, 0.2-0.5 parts of lubricant, and 3-8 parts of desiccant are added into a high-speed mixer and mixed evenly, and the required B component can be obtained after drying;

[0066] 3) Component A and component B are mixed evenly according to the weight ratio, and then placed in an internal mixer, and subjected to high temperature and high pressure shearing and internal mixing for 5-20 minutes, and then sent to a twin-screw extruder for extrusion granulation, and the particles are packaged after cooling and screening.

[0067] The stirring rate of the high-speed stirrer is 260-350 r / min, the stirring time is 3-30 min, and the process temperature of the twin-screw extruder is 190-205° C.

[0068] Example 1

[0069] A low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion, wherein the raw materials for preparing the low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant include component A and component B;

[0070] Component A includes the following components in parts by weight:

[0071] 25 parts of carboxylated polyolefin

[0072] Flame retardant 40 parts

[0073] 0.4 parts of antioxidant

[0074] 1.5 parts of lubricant

[0075] 7 parts of compatibilizer

[0076] 8 parts of desiccant

[0077] 10 parts of silanol;

[0078] Component B includes the following components in parts by weight:

[0079] Nano kaolinite 15 parts

[0080] 4 parts surfactant

[0081] Flame retardant 15 parts

[0082] Masterbatch 1 part

[0083] Antioxidant 0.2 parts

[0084] 0.2 parts of lubricant

[0085] 3 parts of desiccant.

[0086] The weight ratio of component A to component B is controlled at 2:5.

[0087] The flame retardant is prepared by modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate, wherein the weight ratio of the modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate is 1:1:2. The modified hydrotalcite is a hydrotalcite with a carboxyl group prepared by acidifying hydrotalcite with sulfuric acid, and the modified zinc oxide is a nano zinc oxide with a hydroxyl group prepared by hydroxylating nano zinc oxide.

[0088] The lubricant is polyethylene wax.

[0089] The compatibilizer is polyethylene grafted with maleic anhydride.

[0090] The antioxidant is a hindered phenol antioxidant.

[0091] The desiccant is calcium chloride.

[0092] The surfactant is sodium glycocholate.

[0093] A method for preparing a low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion, comprising the following steps:

[0094] 1) Preparation of component A:

[0095] By weight, 25 parts of carboxylated polyolefin, 40 parts of flame retardant, 0.4 parts of antioxidant, 1.5 parts of lubricant, 7 parts of compatibilizer and 8 parts of desiccant were added into a high-speed mixer and mixed evenly, and then 10 parts of silanol were added, mixed evenly, and dried to obtain the required component A;

[0096] 2) Preparation of component B:

[0097] By weight, 15 parts of nano-kaolinite, 4 parts of surfactant, 15 parts of flame retardant, 1 part of masterbatch, 0.2 parts of antioxidant, 0.2 parts of lubricant and 3 parts of desiccant were added into a high-speed mixer and mixed evenly, and the required B component was obtained after drying;

[0098] 3) Component A and component B are mixed evenly according to the weight ratio, and then placed in an internal mixer, subjected to high temperature and high pressure shearing internal mixing for 10 minutes, and then sent to a twin-screw extruder for extrusion granulation, and the particles are packaged after cooling and screening.

[0099] The stirring rate of the high-speed mixer is 350r / min, the stirring time is 5min, the process temperature of the twin-screw extruder is 190-205°C, and the temperatures from zone one to zone six are 190°C, 195°C, 195°C, 195°C, 195°C, and 200°C respectively.

[0100] Example 2

[0101] A low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion, wherein the raw materials for preparing the low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant include component A and component B;

[0102] Component A includes the following components in parts by weight:

[0103] 50 parts of carboxylated polyolefin

[0104] Flame retardant 20 parts

[0105] 0.3 parts of antioxidant

[0106] 0.3 parts of lubricant

[0107] 2 parts of compatibilizer

[0108] 3 parts of desiccant

[0109] 1 part of silanol;

[0110] Component B includes the following components in parts by weight:

[0111] Nano kaolinite 10 parts

[0112] 5 parts surfactant

[0113] Flame retardant 25 parts

[0114] Masterbatch 3 parts

[0115] 0.5 parts of antioxidant

[0116] 0.5 parts of lubricant

[0117] 8 parts of desiccant.

[0118] The weight ratio of component A to component B is controlled at 1:2.

[0119] The flame retardant is prepared by modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate, wherein the weight ratio of the modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate is 1:1:2. The modified hydrotalcite is a hydrotalcite with a carboxyl group prepared by acidifying the hydrotalcite with hydrochloric acid, and the modified zinc oxide is a nano zinc oxide with a hydroxyl group prepared by hydroxylating nano zinc oxide.

[0120] The lubricant is zinc stearate.

[0121] The compatibilizer is polyethylene grafted with maleic anhydride.

[0122] The antioxidant is a hindered phenol antioxidant.

[0123] The desiccant is calcium chloride.

[0124] The surfactant is sodium glycocholate.

[0125] A method for preparing a low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion, comprising the following steps:

[0126] 1) Preparation of component A:

[0127] By weight, 50 parts of carboxylated polyolefin, 20 parts of flame retardant, 0.3 parts of antioxidant, 0.3 parts of lubricant, 2 parts of compatibilizer and 3 parts of desiccant were added into a high-speed mixer and mixed evenly, and then 1 part of silanol was added, mixed evenly, and dried to obtain the required component A;

[0128] 2) Preparation of component B:

[0129] By weight, 10 parts of nano-kaolinite, 5 parts of surfactant, 25 parts of flame retardant, 3 parts of masterbatch, 0.5 parts of antioxidant, 0.5 parts of lubricant and 8 parts of desiccant were added into a high-speed mixer and mixed evenly, and the required B component was obtained after drying;

[0130] 3) Component A and component B are mixed evenly according to the weight ratio, and then placed in an internal mixer, subjected to high temperature and high pressure shearing internal mixing for 20 minutes, and then sent to a twin-screw extruder for extrusion granulation, and the particles are packaged after cooling and screening.

[0131] The stirring rate of the high-speed mixer is 260r / min, the stirring time is 30min, the process temperature of the twin-screw extruder is 190-205°C, and the temperatures from zone one to zone six are 190°C, 195°C, 195°C, 195°C, 195°C, and 200°C respectively.

[0132] The rest is the same as in Example 1.

[0133] Example 3

[0134] A low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion, wherein the raw materials for preparing the low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant include component A and component B;

[0135] Component A includes the following components in parts by weight:

[0136] 40 parts of carboxylated polyolefin

[0137] Flame retardant 30 parts

[0138] 0.3 parts of antioxidant

[0139] 0.5 parts of lubricant

[0140] 3 parts of compatibilizer

[0141] Desiccant 5 parts

[0142] 6 parts of silanol;

[0143] Component B includes the following components in parts by weight:

[0144] 4 parts of nano kaolinite

[0145] 3 parts surfactant

[0146] Flame retardant 20 parts

[0147] 2 parts of masterbatch

[0148] 0.3 parts of antioxidant

[0149] 0.3 parts of lubricant

[0150] 6 parts of desiccant.

[0151] The weight ratio of component A to component B is controlled at 3:5.

[0152] The flame retardant is prepared by modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate, wherein the weight ratio of the modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate is 3:4:3. The modified hydrotalcite is a hydrotalcite with a carboxyl group prepared by acidifying hydrotalcite with sulfuric acid, and the modified zinc oxide is a nano zinc oxide with a hydroxyl group prepared by hydroxylating nano zinc oxide.

[0153] The lubricant is silicone.

[0154] The compatibilizer is polyethylene grafted with maleic anhydride.

[0155] A method for preparing a low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion, comprising the following steps:

[0156] 1) Preparation of component A:

[0157] By weight, 40 parts of carboxylated polyolefin, 30 parts of flame retardant, 0.3 parts of antioxidant, 0.5 parts of lubricant, 3 parts of compatibilizer and 5 parts of desiccant were added into a high-speed mixer and mixed evenly, and then 6 parts of silanol were added, mixed evenly, and dried to obtain the required component A;

[0158] 2) Preparation of component B:

[0159] By weight, 4 parts of nano-kaolinite, 3 parts of surfactant, 20 parts of flame retardant, 2 parts of masterbatch, 0.3 parts of antioxidant, 0.3 parts of lubricant and 6 parts of desiccant were added into a high-speed mixer and mixed evenly, and the required B component was obtained after drying;

[0160] 3) Component A and component B are mixed evenly according to the weight ratio, and then placed in an internal mixer, subjected to high temperature and high pressure shearing internal mixing for 15 minutes, and then sent to a twin-screw extruder for extrusion granulation, and the particles are packaged after cooling and screening.

[0161] The stirring rate of the high-speed mixer is 300r / min, and the stirring time is 20min. The process temperature of the twin-screw extruder is 190-205°C, and the temperatures from zone one to zone six are 190°C, 195°C, 195°C, 195°C, 195°C, and 200°C respectively.

[0162] The rest is the same as in Example 1.

[0163] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0164] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion, characterized in that: The raw materials for preparing the low-smoke halogen-free radiation cross-linked polyolefin flame retardant material include component A and component B; The A component includes the following components in parts by weight: Carboxylated polyolefin 25-50 parts Flame retardant 20-40 parts Antioxidant 0.3-0.5 parts Lubricant 0.3-1.5 parts Compatibilizer 2-7 parts 3-8 parts of desiccant 1-10 parts of silanol; The B component includes the following components in parts by weight: Nano kaolinite 1-15 parts Surfactant 2-8 parts Flame retardant 15-25 parts Masterbatch 1-3 parts Antioxidant 0.2-0.5 parts Lubricant 0.2-0.5 parts 3-8 parts of desiccant.

2. The low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion according to claim 1, characterized in that: The weight ratio of component A to component B is controlled at 1-5:2-8.

3. The low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion according to claim 1, characterized in that: The flame retardant is prepared by modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate.

4. The low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion according to claim 3, characterized in that: The modified hydrotalcite is a hydrotalcite with a carboxyl group prepared by acidifying hydrotalcite with sulfuric acid or hydrochloric acid.

5. The low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion according to claim 3, characterized in that: The modified zinc oxide is nano zinc oxide with hydroxyl groups prepared by hydroxylating nano zinc oxide.

6. The low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion according to claim 3, characterized in that: The weight ratio of the modified hydrotalcite, modified zinc oxide and piperazine pyrophosphate is 1-4:1-5:2-3.

7. The low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion according to claim 1, characterized in that: The lubricant is one or a combination of polyethylene wax, silicone, and zinc stearate.

8. The low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion according to claim 1, characterized in that: The compatibilizer is at least one of polyethylene grafted maleic anhydride and ethylene-vinyl acetate grafted maleic anhydride.

9. A method for preparing a low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion according to any one of claims 1 to 8, characterized in that: The following steps are involved: 1) Preparation of component A: By weight, 25-50 parts of carboxylated polyolefin, 20-40 parts of flame retardant, 0.3-0.5 parts of antioxidant, 0.3-1.5 parts of lubricant, 2-7 parts of compatibilizer, and 3-8 parts of desiccant are added into a high-speed mixer and mixed evenly, and then 1-10 parts of silanol are added, mixed evenly, and dried to obtain the desired component A; 2) Preparation of component B: By weight, 1-15 parts of nano-kaolinite, 2-8 parts of surfactant, 15-25 parts of flame retardant, 1-3 parts of masterbatch, 0.2-0.5 parts of antioxidant, 0.2-0.5 parts of lubricant, and 3-8 parts of desiccant are added into a high-speed mixer and mixed evenly, and the required B component can be obtained after drying; 3) Component A and component B are mixed evenly according to the weight ratio, and then placed in an internal mixer, and subjected to high temperature and high pressure shearing and internal mixing for 5-20 minutes, and then sent to a twin-screw extruder for extrusion granulation, and the particles are packaged after cooling and screening.

10. The method for preparing a low-smoke, halogen-free, radiation-crosslinked polyolefin flame retardant suitable for high-speed extrusion according to claim 9, characterized in that: The stirring rate of the high-speed stirrer is 260-350 r / min, the stirring time is 3-30 min, and the process temperature of the twin-screw extruder is 190-205° C.