CN108794863B - Efficient flame-retardant cable material and preparation method thereof - Google Patents

Abstract

The invention provides a high-efficiency flame-retardant cable material and a preparation method thereof, wherein the high-efficiency flame-retardant cable material comprises the following raw materials: low-density polyethylene, ethylene-vinyl acetate copolymer, modified aluminum hypophosphite, moroxydine, ethylene glycol stearate, polypropylene wax, photocatalyst, aluminum-magnesium alloy powder and antioxidant; the modified aluminum hypophosphite comprises the following components in percentage by mass of 6: 2: 9: 1, aluminum hypophosphite, methylene dicarbamate, phenyl silicone oil and polyimide; the preparation method of the high-efficiency flame-retardant cable material comprises the following steps: s1, weighing the raw materials; s2, dispersing moroxydine into the modified aluminum hypophosphite; s3, mixing the raw materials; and S4, carrying out bracing, granulating, extruding and granulating to obtain the high-efficiency flame-retardant cable material. The cable material provided by the invention is reasonable in formula, the addition amount of raw materials playing a flame retardant role is small, the preparation method is simple, and the obtained cable material has excellent aging resistance, antibacterial property, corrosion resistance, flame retardance and mechanical properties.

Description

A kind of high-efficiency flame-retardant cable material and preparation method thereof

technical field

The invention relates to the technical field of cable materials, in particular to a high-efficiency flame-retardant cable material and a preparation method thereof.

Background technique

Cables are wire products used to transmit electrical energy, magnetic energy, information and realize electromagnetic energy conversion. The cable is mainly composed of conductor, conductor shielding layer, insulating layer, insulating shielding layer, buffer layer, metal sheath, outer sheath, etc. Most of the outer sheath is located at the outermost layer of the cable, which plays the role of protecting the cable. At present, plastic, rubber, etc. are mostly used as the main materials. However, traditional cables have poor flame retardancy and are prone to fire, resulting in property damage and casualties. Therefore, researchers are paying more and more attention to the problem of poor flame retardancy of cable materials. At first, the improvement of the flame retardant properties of cables was achieved by halogen polymers, but due to the fact that halogen-containing substances will produce a large amount of substances that are harmful to human body, equipment or the environment during heating or burning, they have been gradually restricted. use. In order to improve the flame retardant properties of cable materials, Chinese Patent Authorization Announcement No.: CN 104961962 B discloses a composite cable material with flame retardant effect and a preparation method thereof. The patent uses sodium bicarbonate, organic silicon microspheres The composite flame retardant composed of , yellow antimony stone powder, expandable graphite powder and zinc hydroxystannate is synergistically compounded with microencapsulated red phosphorus to achieve the flame retardant effect. However, in this patent, the added amount of composite flame retardant accounts for 35% of the total mass, the mass of microencapsulated red phosphorus accounts for 8% of the total mass, the mass of the two components that play a flame retardant role and the total mass of 43%, which will increase the difficulty of dispersing the composite flame retardant and microencapsulated red phosphorus in the cable material, and the addition of a large amount of additives will deteriorate the mechanical properties of the cable material and affect the service life of the cable material. Based on the deficiencies in the prior art, the present invention proposes a high-efficiency flame-retardant cable material and a preparation method thereof.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problems of the poor flame retardant performance of the existing cable materials, the large amount of flame retardant added in the flame retardant cable materials, and the easy deterioration of the mechanical properties of the cable materials, and the proposed high-efficiency flame retardant cable material and its preparation method.

To achieve the above purpose, the present invention is achieved through the following technical solutions:

A high-efficiency flame-retardant cable material, comprising the following raw materials in parts by weight: 80-120 parts of low-density polyethylene, 10-15 parts of ethylene-vinyl acetate copolymer, 0.4-3.2 parts of modified aluminum hypophosphite, and 0.1 part of morpholine guanidine ～0.4 part, 0.5-3 part of ethylene glycol stearate, 0.5-3 part of polypropylene wax, 0.4-1.6 part of photocatalyst, 1-4 part of aluminum-magnesium alloy powder, 0.2-0.5 part of anti-nutrient; The modified aluminum hypophosphite is prepared by mixing aluminum hypophosphite, methylene dicarbamate, phenyl silicone oil and polyimide in a mass ratio of 6:2:9:1.

Preferably, the high-efficiency flame-retardant cable material includes the following raw materials in parts by weight: 90-110 parts of low-density polyethylene, 11-14 parts of ethylene-vinyl acetate copolymer, 0.6-2.4 parts of modified aluminum hypophosphite, morpholine 0.15-0.3 parts of guanidine, 1-2.5 parts of ethylene glycol stearate, 1.5-2.5 parts of polypropylene wax, 0.6-1.2 parts of photocatalyst, 2-4 parts of aluminum-magnesium alloy powder, and 0.3-0.5 parts of anti-nutrients.

Preferably, the mass ratio of the modified aluminum hypophosphite to morpholineguanidine is 4-8:1, and further preferably, the mass ratio of the methylene dicarbamate to morpholineguanidine is 6:1.

Preferably, the high-efficiency flame-retardant cable material includes the following raw materials by weight: 100 parts of low-density polyethylene, 13 parts of ethylene-vinyl acetate copolymer, 1.5 parts of modified aluminum hypophosphite, 0.25 parts of morpholine guanidine, stearin 1.5 parts of ethylene glycol monoester, 2 parts of polypropylene wax, 0.9 parts of photocatalyst, 3 parts of aluminum-magnesium alloy powder, and 0.4 part of antioxidant.

The present invention also proposes a method for preparing a high-efficiency flame-retardant cable material, comprising the following steps:

S1. According to 80-120 parts of low-density polyethylene, 10-15 parts of ethylene-vinyl acetate copolymer, 0.4-3.2 parts of modified aluminum hypophosphite, 0.1-0.4 parts of morpholine guanidine, ethylene glycol stearate monoester 0.5-3 parts of polypropylene wax, 0.5-3 parts of polypropylene wax, 0.4-1.6 parts of photocatalyst, 1-4 parts of aluminum-magnesium alloy powder, and 0.2-0.5 part of anti-nutrients. Weigh each raw material for later use. The modified aluminum hypophosphite is composed of The mass ratio is 6:2:9:1 mixed with aluminum hypophosphite, methylene dicarbamate, phenyl silicone oil and polyimide;

S2, adding the morpholine guanidine weighed in step S1 into the modified aluminum hypophosphite, first stirring at a rotating speed of 100-200 r/min for 5-15 min, then heating up to 40-60 °C and stirring for 10-20 min to obtain mixture A ;

S3, the low-density polyethylene and the ethylene-vinyl acetate copolymer taken by step S1 are added into the internal mixer to carry out banburying to obtain mixture B, then the ethylene glycol stearate monoester, poly Add propylene wax, photocatalyst, aluminum-magnesium alloy powder, anti-nutrient and mixture A prepared in step S2 into mixture B in turn, and stir evenly at a rotating speed of 200-300 r/min to obtain mixture C;

S4. The mixture C is cut into pellets through a strand, and then extruded and pelletized through a screw rod to obtain a high-efficiency flame-retardant cable material.

Compared with the prior art, the high-efficiency flame-retardant cable material provided by the present invention has the following advantages:

1. The cable material proposed by the present invention has a reasonable formula, uses low-density polyethylene as the main material, and uses ethylene-vinyl acetate copolymer as the auxiliary material. The dispersion effect of photocatalyst and aluminum-magnesium alloy powder can also improve the fluidity of cable material raw materials, so that the product has excellent aging resistance, antibacterial property, corrosion resistance and good molding processability, and expands the use range of the product. At the same time, the modified aluminum hypophosphite and morpholine guanidine added to the cable material can not only maintain the good mechanical properties of the product, but also significantly improve the flame retardant properties of the product, and the addition amount of the two is small, accounting for only 3% of the total mass. 0.3% to 3.7%, much smaller than the existing technology.

2. The present invention modifies aluminum hypophosphite through a reasonable proportion of methylene dicarbamate, phenyl silicone oil and polyimide, which can increase the surface activity of aluminum hypophosphite and improve the dispersibility of aluminum hypophosphite. , the modified aluminum hypophosphite obtained by modification is easy to combine with morpholine guanidine in the cable material, which can significantly improve the flame retardant properties of the product, thereby reducing the amount of flame retardant used, and effectively solving the flame retardant properties of traditional cable materials. The problem of poor and flame-retardant cable materials with a large amount of flame retardants is easy to deteriorate the mechanical properties of the cable materials, and experiments have proved that the combination of the two in the cable materials can significantly improve the mechanical properties and flame retardant properties of the product. Especially when the mass ratio of methylene dicarbamate and morpholine guanidine is 6:1, the flame retardant performance of the cable material is the best, and the oxygen index can reach 46.7%;

3. The preparation method of the high-efficiency flame-retardant cable material proposed by the present invention has the advantages of simple operation and good mixing effect between the raw materials. Morpholine guanidine is firstly added to the modified aluminum hypophosphite, and the two are fully combined before mixing with the cable material. Mixing other raw materials in the mixture can improve the dispersion speed of the combined product in the main material, ensure the uniformity of the product, suitable for industrial production, and can improve the flame retardant performance and mechanical properties of the product.

Detailed ways

The present invention will be further explained below in conjunction with specific embodiments.

Example 1

The high-efficiency flame-retardant cable material proposed by the present invention includes the following raw materials in parts by weight: 80 parts of low-density polyethylene, 10 parts of ethylene-vinyl acetate copolymer, 0.4 part of modified aluminum hypophosphite, 0.1 part of morpholine guanidine, 0.5 part of ethylene glycol stearate, 0.5 part of polypropylene wax, 0.4 part of photocatalyst, 1 part of aluminum-magnesium alloy powder, 0.2 part of antioxidant; the mass ratio of the modified aluminum hypophosphite is 6:2:9 : 1 mixed with aluminum hypophosphite, methylene dicarbamate, phenyl silicone oil and polyimide; the antioxidant is antioxidant 168.

Its preparation method comprises the following steps:

S1. According to 80 parts of low density polyethylene, 10 parts of ethylene-vinyl acetate copolymer, 0.4 part of modified aluminum hypophosphite, 0.1 part of morpholine guanidine, 0.5 part of ethylene glycol stearate, and 0.5 part of polypropylene wax , 0.4 part of photocatalyst, 1 part of aluminum-magnesium alloy powder, and 0.2 part of antioxidant to weigh each raw material and set aside;

S2, adding the morpholine guanidine weighed in step S1 into the modified aluminum hypophosphite, first stirring for 15 min at a rotating speed of 100 r/min, then heating up to 60 °C and stirring for 10 min to obtain mixture A;

S3, the low-density polyethylene and the ethylene-vinyl acetate copolymer taken by step S1 are added into the internal mixer to carry out banburying to obtain mixture B, then the ethylene glycol stearate monoester, poly Acrylic wax, photocatalyst, aluminum-magnesium alloy powder, antioxidant and mixture A prepared in step S2 were added to mixture B in turn, and stirred uniformly at a rotating speed of 200 r/min to obtain mixture C;

S4. The mixture C is cut into pellets through a strand, and then extruded and pelletized through a screw rod to obtain a high-efficiency flame-retardant cable material.

Example 2

The high-efficiency flame-retardant cable material proposed by the present invention includes the following raw materials in parts by weight: 100 parts of low-density polyethylene, 13 parts of ethylene-vinyl acetate copolymer, 1.5 parts of modified aluminum hypophosphite, 0.25 parts of morpholine guanidine, 1.5 parts of ethylene glycol stearate, 2 parts of polypropylene wax, 0.9 parts of photocatalyst, 3 parts of aluminum-magnesium alloy powder, 0.4 parts of antioxidant; the mass ratio of the modified aluminum hypophosphite is 6:2:9 : 1 mixed with aluminum hypophosphite, methylene dicarbamate, phenyl silicone oil and polyimide; the antioxidant is antioxidant 626.

Its preparation method comprises the following steps:

S1. According to 100 parts of low-density polyethylene, 13 parts of ethylene-vinyl acetate copolymer, 1.5 parts of modified aluminum hypophosphite, 0.25 parts of morpholine guanidine, 1.5 parts of ethylene glycol stearate, and 2 parts of polypropylene wax , 0.9 parts of photocatalyst, 3 parts of aluminum-magnesium alloy powder, and 0.4 part of antioxidant to weigh each raw material and set aside;

S2, adding the morpholine guanidine weighed in step S1 into the modified aluminum hypophosphite, first stirring for 10 min at a rotating speed of 150 r/min, then heating to 50 °C and stirring for 15 min to obtain mixture A;

S3, the low-density polyethylene and the ethylene-vinyl acetate copolymer taken by step S1 are added into the internal mixer to carry out banburying to obtain mixture B, then the ethylene glycol stearate monoester, poly Acrylic wax, photocatalyst, aluminum-magnesium alloy powder, antioxidant and mixture A prepared in step S2 were added to mixture B in turn, and stirred uniformly at a rotating speed of 250 r/min to obtain mixture C;

S4. The mixture C is cut into pellets through a strand, and then extruded and pelletized through a screw rod to obtain a high-efficiency flame-retardant cable material.

Example 3

The high-efficiency flame-retardant cable material proposed by the present invention includes the following raw materials in parts by weight: 120 parts of low-density polyethylene, 15 parts of ethylene-vinyl acetate copolymer, 3.2 parts of modified aluminum hypophosphite, 0.4 parts of morpholine guanidine, 3 parts of ethylene glycol stearate, 3 parts of polypropylene wax, 1.6 parts of photocatalyst, 4 parts of aluminum-magnesium alloy powder, 0.5 part of antioxidant; the mass ratio of the modified aluminum hypophosphite is 6:2:9 : 1 mixed with aluminum hypophosphite, methylene dicarbamate, phenyl silicone oil and polyimide; the antioxidant is antioxidant 1010.

Its preparation method comprises the following steps:

S1. According to 120 parts of low density polyethylene, 15 parts of ethylene-vinyl acetate copolymer, 3.2 parts of modified aluminum hypophosphite, 0.4 parts of morpholine guanidine, 3 parts of ethylene glycol stearate, and 3 parts of polypropylene wax , 1.6 parts of photocatalyst, 4 parts of aluminum-magnesium alloy powder, and 0.5 part of antioxidant to weigh each raw material and set aside;

S2, adding the morpholine guanidine weighed in step S1 into the modified aluminum hypophosphite, first stirring for 5 min at a rotating speed of 200 r/min, then heating up to 40 °C and stirring for 20 min to obtain mixture A;

S3, the low-density polyethylene and the ethylene-vinyl acetate copolymer taken by step S1 are added into the internal mixer to carry out banburying to obtain mixture B, then the ethylene glycol stearate monoester, poly Acrylic wax, photocatalyst, aluminum-magnesium alloy powder, antioxidant and mixture A prepared in step S2 were added to mixture B in turn, and stirred uniformly at a rotating speed of 300 r/min to obtain mixture C;

S4. The mixture C is cut into pellets through a strand, and then extruded and pelletized through a screw rod to obtain a high-efficiency flame-retardant cable material.

Comparative Example 1

The composite cable material with flame retardant effect prepared according to China Patent Authorization Announcement No.: CN 104961962 B.

Comparative Example 2

The high-efficiency flame-retardant cable material proposed by the present invention includes the following raw materials in parts by weight: 80 parts of low-density polyethylene, 10 parts of ethylene-vinyl acetate copolymer, 0.4 part of aluminum hypophosphite, 0.1 part of morpholine guanidine, stearin 0.5 part of ethylene glycol monoester, 0.5 part of polypropylene wax, 0.4 part of photocatalyst, 1 part of aluminum-magnesium alloy powder, 0.2 part of antioxidant; antioxidant is antioxidant 168.

Its preparation method comprises the following steps:

S1. According to 80 parts of low density polyethylene, 10 parts of ethylene-vinyl acetate copolymer, 0.4 part of modified aluminum hypophosphite, 0.1 part of morpholine guanidine, 0.5 part of ethylene glycol stearate, and 0.5 part of polypropylene wax , 0.4 part of photocatalyst, 1 part of aluminum-magnesium alloy powder, and 0.2 part of antioxidant to weigh each raw material and set aside;

S2, adding the morpholine guanidine weighed in step S1 into the aluminum hypophosphite, first stirring for 15 minutes at a rotating speed of 100 r/min, then warming up to 60 °C and stirring for 10 minutes to obtain mixture A;

S3, the low-density polyethylene and the ethylene-vinyl acetate copolymer taken by step S1 are added into the internal mixer to carry out banburying to obtain mixture B, then the ethylene glycol stearate monoester, poly Acrylic wax, photocatalyst, aluminum-magnesium alloy powder, antioxidant and mixture A prepared in step S2 were added to mixture B in turn, and stirred uniformly at a rotating speed of 200 r/min to obtain mixture C;

S4. The mixture C is cut into pellets through a strand, and then extruded and pelletized through a screw rod to obtain a high-efficiency flame-retardant cable material.

Comparative Example 3

The high-efficiency flame-retardant cable material proposed by the present invention includes the following raw materials in parts by weight: 80 parts of low-density polyethylene, 10 parts of ethylene-vinyl acetate copolymer, 0.4 part of modified aluminum hypophosphite, 0.1 part of morpholine guanidine, 0.5 part of ethylene glycol stearate, 0.5 part of polypropylene wax, 0.4 part of photocatalyst, 1 part of aluminum-magnesium alloy powder, 0.2 part of antioxidant; the mass ratio of the modified aluminum hypophosphite is 6:2:9 : 1 mixed with aluminum hypophosphite, methylene dicarbamate, phenyl silicone oil and polyimide; the antioxidant is antioxidant 168.

Its preparation method comprises the following steps:

S1. According to 80 parts of low density polyethylene, 10 parts of ethylene-vinyl acetate copolymer, 0.4 part of modified aluminum hypophosphite, 0.1 part of morpholine guanidine, 0.5 part of ethylene glycol stearate, and 0.5 part of polypropylene wax , 0.4 part of photocatalyst, 1 part of aluminum-magnesium alloy powder, and 0.2 part of antioxidant to weigh each raw material and set aside;

S2, adding the low-density polyethylene and ethylene-vinyl acetate copolymer weighed in step S1 into the Banbury mixer to obtain mixture A, and then weighing the morpholine guanidine, modified aluminum hypophosphite, Ethylene glycol monoester of stearate, polypropylene wax, photocatalyst, aluminum-magnesium alloy powder, and antioxidant are successively added to mixture A, and stirred uniformly at a rotating speed of 200 r/min to obtain mixture B;

S4. The mixture B is then cut into pellets through a strand, and then extruded and pelletized through a screw rod to obtain a high-efficiency flame-retardant cable material.

The cable materials prepared in Examples 1-3 and the cable materials prepared in Comparative Examples 1-3 were tested for performance, and the results are shown in Table 1.

Table 1:

Test items Tensile strength (MPa) Elongation at break (%) Oxygen Index(%) UL-94 Example 1 18.8 586 40.4 V-O Example 2 25.4 623 46.7 V-O Example 3 19.3 599 41.6 V-O Comparative Example 1 14.2 531 35.2 V-O Comparative Example 2 9.8 456 33.3 V-1 Comparative Example 3 10.3 479 34.5 V-0

The experimental results in Table 1 show that the cable materials prepared in Examples 1 to 3 have excellent flame retardant properties, the oxygen index can reach more than 40%, the tensile strength can still reach more than 18MPa, and the elongation at break can reach more than 580%. In contrast, the oxygen index, tensile strength and elongation at break of the cable materials prepared in Comparative Examples 1 to 3 are lower than those of the cable materials prepared in Examples 1 to 3 of the present invention. In addition, Examples 1 to 3 prepared The UL-94 flame retardant grade test of the cable materials can reach the V-0 level, which shows that the cable material proposed by the present invention not only has excellent flame retardant performance, but also has excellent mechanical properties.

Under the condition that the total mass of the modified aluminum hypophosphite and morpholine guanidine remains unchanged, the modified aluminum hypophosphite and morpholine guanidine in Example 1 are replaced according to the weight parts in Table 2, and other conditions are the same as those in Example 1 The prepared cable materials were then tested for performance, and the results are shown in Table 2.

Table 2:

Modified Aluminum Hypophosphite Morpholineguanidine Tensile strength (MPa) Elongation at break (%) Oxygen Index(%) 0 0.5 12.4 433 32.6 0.5 0 10.5 425 33.9 0.125 0.375 12.6 458 34.6 0.167 0.333 12.7 471 34.7 0.25 0.25 15.3 525 35.8 0.333 0.167 16.6 542 36.7 0.375 0.125 16.9 548 37.1 0.4 0.1 18.8 586 40.4 0.417 0.083 19.2 603 42.5 0.429 0.071 25.1 618 45.3 0.438 0.062 20.3 605 41.5 0.444 0.056 19.0 592 40.9 0.45 0.05 16.9 553 37.6 0.462 0.038 16.5 541 36.9 0.469 0.031 16.4 533 36.6 0.484 0.016 16.2 529 35.8 0.485 0.015 15.8 512 35.2 0.486 0.014 12.6 463 34.6 0.467 0.013 12.5 439 34.1

The experimental results in Table 2 show that the oxygen index of the cable material obtained by using modified aluminum hypophosphite or morpholine guanidine alone is only about 33%, and the tensile strength and elongation at break are also low. After the compound addition of morpholineguanidine, the tensile strength, elongation at break and oxygen index of the obtained cable material were improved, but when the weight part of modified aluminum hypophosphite was less than 0.25 or greater than 0.485, the obtained cable material Tensile strength, elongation at break and oxygen index are not ideal, and when the weight part of modified aluminum hypophosphite is between 0.25 and 0.485 (that is, the mass ratio of modified aluminum hypophosphite and morpholine guanidine is 1 to 32: 1), the tensile strength of the obtained cable material can reach more than 15MPa, the elongation at break can reach more than 500%, the oxygen index can reach more than 35%, and the mechanical properties and flame retardant properties have been improved to a certain extent, especially modified When the weight part of aluminum hypophosphite is between 0.4 and 0.444 (that is, the mass ratio of modified aluminum hypophosphite and morpholine guanidine is 4 to 8:1), the tensile strength of the obtained cable material can reach more than 18MPa and the elongation at break The rate can reach more than 580%, the oxygen index can reach more than 40%, the mechanical properties and flame retardant properties are significantly improved, and when the weight part of modified aluminum hypophosphite is 0.429 (that is, modified aluminum hypophosphite and The mass ratio of guanidine is 6:1), the oxygen index of the obtained cable material can reach 45.3%, the tensile strength is 25.1MPa, the elongation at break can reach 618%, and the comprehensive performance is the best.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (6)

1. The efficient flame-retardant cable material is characterized by comprising the following raw materials in parts by weight: 80-120 parts of low-density polyethylene, 10-15 parts of ethylene-vinyl acetate copolymer, 0.4-3.2 parts of modified aluminum hypophosphite, 0.1-0.4 part of moroxydine, 0.5-3 parts of ethylene glycol stearate, 0.5-3 parts of polypropylene wax, 0.4-1.6 parts of photocatalyst, 1-4 parts of aluminum-magnesium alloy powder and 0.2-0.5 part of antioxidant; the modified aluminum hypophosphite comprises the following components in percentage by mass of 6: 2: 9: 1 of aluminum hypophosphite, methylene dicarbamate, phenyl silicone oil and polyimide.

2. The efficient flame-retardant cable material as claimed in claim 1, characterized by comprising the following raw materials in parts by weight: 90-110 parts of low-density polyethylene, 11-14 parts of ethylene-vinyl acetate copolymer, 0.6-2.4 parts of modified aluminum hypophosphite, 0.15-0.3 part of moroxydine, 1-2.5 parts of ethylene glycol stearate, 1.5-2.5 parts of polypropylene wax, 0.6-1.2 parts of photocatalyst, 2-4 parts of aluminum-magnesium alloy powder and 0.3-0.5 part of antioxidant.

3. The efficient flame-retardant cable material as claimed in claim 1 or 2, wherein the mass ratio of the modified aluminum hypophosphite to the moroxydine is 4-8: 1.

4. the efficient flame-retardant cable material as claimed in claim 1 or 2, characterized by comprising the following raw materials in parts by weight: 100 parts of low-density polyethylene, 13 parts of ethylene-vinyl acetate copolymer, 1.5 parts of modified aluminum hypophosphite, 0.25 part of moroxydine, 1.5 parts of ethylene glycol stearate, 2 parts of polypropylene wax, 0.9 part of photocatalyst, 3 parts of aluminum magnesium alloy powder and 0.4 part of antioxidant.

5. The high-efficiency flame-retardant cable material as claimed in claim 1 or 2, wherein the antioxidant is antioxidant 168, antioxidant 626 or antioxidant 1010.

6. The preparation method of the high-efficiency flame-retardant cable material is characterized by comprising the following steps of:

s1, weighing raw materials according to 80-120 parts of low-density polyethylene, 10-15 parts of ethylene-vinyl acetate copolymer, 0.4-3.2 parts of modified aluminum hypophosphite, 0.1-0.4 part of moroxydine, 0.5-3 parts of ethylene glycol stearate, 0.5-3 parts of polypropylene wax, 0.4-1.6 parts of photocatalyst, 1-4 parts of aluminum-magnesium alloy powder and 0.2-0.5 part of antioxidant for later use, wherein the modified aluminum hypophosphite is prepared by mixing the following raw materials in parts by mass: 2: 9: 1, aluminum hypophosphite, methylene dicarbamate, phenyl silicone oil and polyimide;

s2, adding moroxydine weighed in the step S1 into the modified aluminum hypophosphite, stirring for 5-15 min at the rotating speed of 100-200 r/min, and then heating to 40-60 ℃ and stirring for 10-20 min to obtain a mixture A;

s3, adding the low-density polyethylene and the ethylene-vinyl acetate copolymer weighed in the step S1 into an internal mixer for internal mixing to obtain a mixture B, then sequentially adding the ethylene glycol stearate weighed in the step S1, the polypropylene wax, the photocatalyst, the aluminum-magnesium alloy powder, the antioxidant and the mixture A prepared in the step S2 into the mixture B, and uniformly stirring at the rotating speed of 200-300 r/min to obtain a mixture C;

and S4, carrying out bracing and dicing on the mixture C, and carrying out extrusion and granulation by a screw rod to obtain the high-efficiency flame-retardant cable material.