CN114989554A - A kind of low dielectric loss halogen-free flame retardant cable material and preparation method thereof - Google Patents

Abstract

The invention discloses a low dielectric loss halogen-free flame retardant cable material and a preparation method thereof. The low dielectric loss halogen free flame retardant cable material is composed of the following components: polyethylene, styrene-ethylene-butylene-styrene embedded Segmented copolymer, ethylene-propylene rubber, halogen-free flame retardant, red phosphorus, tridecanol polyoxyethylene ether phosphate, antioxidant additives, ethyl acetate, 2,5-dimethyl-2,5-bis Hexane; the low dielectric loss halogen-free flame retardant cable material product prepared by the invention has smooth and smooth appearance, excellent flame retardant performance, and has the characteristics of low polarization loss and low free loss. When transmitting high-frequency signals, it has significant advantages such as good flame retardant performance, small signal attenuation, and long transmission distance.

Description

A kind of low dielectric loss halogen-free flame retardant cable material and preparation method thereof

technical field

The invention belongs to the technical field of cable materials, and in particular relates to a low dielectric loss halogen-free flame retardant cable material and a preparation method thereof.

Background technique

In the prior art, cables used for long-distance high-frequency signal transmission generally use non-flame retardant polyethylene as insulation and sheath material. Because polyethylene has the advantages of small dielectric loss angle, good insulation performance and stable physical and chemical properties. However, polyethylene has poor flame retardant performance. When a fire occurs, polyethylene will form a melt flow, expand the combustion range, and increase the hazard of fire. However, although the flame retardant modified polyethylene on the market has good flame retardant performance, it is used as a The resulting cable produces high polarization loss when transmitting signals; at the same time, due to the relatively low decomposition temperature of the traditional flame retardant used, the cable material is prone to micro-bubbles during production, and the wires and cables made of it will generate free air. loss. Under the influence of these two factors, traditional commercial low-smoke halogen-free flame retardant cable materials cannot be used to manufacture cables for long-distance high-frequency signal transmission.

SUMMARY OF THE INVENTION

The purpose of this section is to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the application to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions may not be used to limit the scope of the invention.

The present invention has been made in view of the above and/or problems existing in the prior art.

Therefore, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a halogen-free flame retardant cable material with low dielectric loss.

In order to solve the above-mentioned technical problems, the present invention provides the following technical solutions: including,

Polyethylene, Styrene-Ethylene-Butene-Styrene Block Copolymer, Ethylene-Propylene Rubber, Halogen-Free Flame Retardant, Red Phosphorus, Surface Treatment Agent, Antioxidant Additive, Thinner, 2,5-Dimethyl -2,5-Dihexane.

As a preferred solution of the present invention, wherein: the halogen-free flame retardant cable material, in terms of mass percentage, the contents of each component are: polyethylene 8-15%, styrene-ethylene-butylene-benzene Ethylene block copolymer 10-15%, ethylene-propylene rubber 10-15%, halogen-free flame retardant 45-60%, red phosphorus 1-4%, surface treatment agent 1-2%, antioxidant 1-3 %, 1-2% of diluent, 0.01-0.05% of 2,5-dimethyl-2,5-bishexane, and the sum of the mass percentages of each component is 100%.

As a preferred solution of the present invention, wherein: the density of the styrene-ethylene-butylene-styrene block copolymer is 0.910g/cm ³ , and the styrene content is 33%; The density was 0.87 g/cm ³ , and the mass percentage of ethylene was 70%.

As a preferred solution of the present invention, wherein: the halogen-free flame retardant is magnesium hydroxide, with a purity of ≥99.5%.

As a preferred solution of the present invention, wherein: the antioxidant auxiliary is prepared by co-mixing disulfide and tetra-4,4-biphenyl diphosphite in a mass ratio of 1:1.

As a preferred solution of the present invention, wherein: the diluent is ethyl acetate with a purity of ≥98%.

Another object of the present invention is to overcome the deficiencies in the prior art and provide a method for preparing a halogen-free flame retardant cable material with low dielectric loss.

In order to solve the above-mentioned technical problems, the present invention provides the following technical solutions: including,

Weigh each component by mass percentage:

Add the halogen-free flame retardant into the high-speed mixer, and then add the mixed surface treatment agent and diluent into the high-speed mixer through the nozzle, and mix until the diluent is completely discharged to obtain the treated halogen-free flame retardant;

Add the treated halogen-free flame retardant, polyethylene, styrene-ethylene-butylene-styrene block copolymer, ethylene-propylene rubber, red phosphorus, and antioxidant additives into a pressurized internal mixer, and mix. Refined to obtain a soft gelatinous substance;

The obtained jelly is put into the twin-screw extruder, and 2,5-dimethyl-2,5-bis-hexane is fed into the barrel during this process, and the granular cable material is extruded. Package.

As a preferred solution of the present invention, wherein: the twin-screw extruder is connected to a vacuum pump, wherein the temperature in the first zone is 130-145°C, the temperature in the second zone is 130-145°C, and the temperature in the third zone is 130-145°C. The temperature in the fourth zone is 130-145°C, the temperature in the fifth zone is 130-145°C, the temperature in the sixth zone is 130-145°C, the temperature in the seventh zone is 130-145°C, and the temperature in the eighth zone is 130-145°C. The temperature of the ninth zone is 130-145°C, the temperature of the die head is 140-155°C, and the vacuum pump pressure is set to 0.1-0.2ATM.

As a preferred solution of the present invention, wherein: the 2,5-dimethyl-2,5-dihexane is fed into the barrel, wherein the feeding is by side feeding in the third zone feed.

Beneficial effects of the present invention:

(1) The present invention selects tridecyl alcohol polyoxyethylene ether phosphate, a surface treatment agent with very low polarity, to modify the halogen-free flame retardant, which can not only enhance the compatibility of the flame retardant with the substrate resin , can also reduce the polarity of halogen-free flame retardants.

(2) The present invention selects low-boiling, non-toxic ethyl acetate as the diluent, which can coat the surface treatment agent tridecyl alcohol polyoxyethylene ether phosphate more uniformly on the surface of the flame retardant, and at the same time, under the high temperature After mixing in the mixer for a certain period of time, it can be fully excluded without affecting the material properties.

(3) The present invention utilizes two resins of ethylene-ethylene-butylene-styrene block copolymer and ethylene-propylene rubber, which have the characteristics of good filling and are non-polar materials at the same time, so these two materials are selected to replace traditional low-smoke materials. The very polar ethylene-vinyl acetate copolymer used in halogen-free flame retardant materials can effectively reduce the polarity of the material while satisfying mechanical stability.

(4) In the present invention, when the material is extruded through the twin-screw, the third stage injects bis(2,5-dimethyl-2,5-bishexane) into the barrel through a micro-metering pump. Because the reactivity of double 25 at high temperature is very high, if it reacts with the resin directly in the mixer, the air will be in direct contact with the high-temperature compounded rubber, then the oxygen in the air may interact with the free energy generated by the decomposition of double 25. The base reacts, resulting in incomplete utilization of double-two-five, which in turn leads to fluctuations in the physical and chemical properties of the material.

(5) In the present invention, a vacuum pump is connected to the twin screw to create a negative pressure environment, which can further remove trace water vapor, air, low molecular compounds, etc. contained in the material, so that the material particles are denser and the free loss of the cable is reduced.

Detailed ways

In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention will be described in detail below with reference to the embodiments of the specification.

Many specific details are set forth in the following description to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can do so without departing from the connotation of the present invention. Similar promotion, therefore, the present invention is not limited by the specific embodiments disclosed below.

Second, reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure, or characteristic that may be included in at least one implementation of the present invention. The appearances of "in one embodiment" in various places in this specification are not all referring to the same embodiment, nor are they separate or selectively mutually exclusive from other embodiments.

The raw materials used in the present invention are all commercially available, wherein:

The density of polyethylene is 0.912g/cm ³ , the melt index is 2.0g/10min (190℃*2.16kg), the dielectric loss factor is less than or equal to 0.002, extrusion grade;

Ethylene-ethylene-butylene-styrene block copolymer (SEBS) has a linear structure, the density is 0.910g/cm ³ , the styrene content is 33%, and the viscosity of 10% toluene solution at 25°C is 1500MPa.s;

The density of the ethylene-propylene rubber is 0.87g/cm ³ , the mass percentage content of ethylene is 70%, the Mooney viscosity of the ethylene-propylene rubber is 70MU, and the content of the third monomer ENB is 5%;

Magnesium hydroxide, particle size D50: 80～100nm, D90≤300nm, purity ≥99.5%;

Red phosphorus, particle size D50≤5μm, D90≤10μm, purity >95%;

Tridecyl alcohol polyoxyethylene ether phosphate, industrial grade, purity ≥95%, appearance is light yellow liquid;

Ethyl acetate is industrial grade, the purity is ≥98%, and the appearance is transparent liquid;

2,5-dimethyl-2,5-bishexane (hereinafter referred to as double-two-five) industrial grade, purity 99%.

Example 1

Weigh the following components by mass ratio:

Polyethylene 10%, styrene-ethylene-butylene-styrene block copolymer 13%, ethylene propylene rubber 12%, magnesium hydroxide 57%, red phosphorus 4%, tridecanol polyoxyethylene ether phosphate 1.2 %, antioxidant aid 1.58%, ethyl acetate 1.2%, 2,5-dimethyl-2,5-bishexane 0.02%.

Add magnesium hydroxide into the high mixer, set the speed of the high mixer to 2000rpm, and set the temperature to 145°C; mix tridecyl alcohol polyoxyethylene ether phosphate and ethyl acetate evenly, and add it at a speed of 200ml/min through the nozzle In the high-mixer, at the same time, the speed of the high-mixer is increased to 3000rpm, mixed for 8min, and the ethyl acetate used as the diluent is completely removed to obtain the treated halogen-free flame retardant;

The treated halogen-free flame retardant, polyethylene, styrene-ethylene-butylene-styrene block copolymer, ethylene-propylene rubber, red phosphorus, and antioxidant additives are put into the pressurized internal mixer, and the density is controlled. The maximum pressure of the mixer is 3MPa, and the mixer is mixed to 175°C, so that the various components are mixed evenly to obtain a mixed soft jelly;

The obtained mixed soft jelly was put into a twin-screw extruder connected to a vacuum pump and extruded, and 2,5-dimethyl-2,5-bishexane was fed in the third zone by side feeding. Feeding into the barrel, the temperature of the twin-screw extruder is: 130-145°C in the first zone, 130-145°C in the second zone, 130-145°C in the third zone, 130-145°C in the fourth zone, and 130-130°C in the fifth zone. 145℃, sixth zone 130～145℃, seventh zone 130～145℃, eighth zone 130～145℃, ninth zone 130～145℃, die head 140～155℃, set vacuum pump pressure 0.1～0.2ATM ;

Through the above process, the cable material extruded into pellets can be obtained and packaged after air cooling.

Example 2

Weigh the following components by mass ratio:

Polyethylene 9%, styrene-ethylene-butylene-styrene block copolymer 12%, ethylene propylene rubber 14%, magnesium hydroxide 58%, red phosphorus 3%, tridecanol polyoxyethylene ether phosphate 1.3 %, antioxidant aid 1.37%, ethyl acetate 1.3%, 2,5-dimethyl-2,5-bishexane 0.03%.

Add magnesium hydroxide into the high mixer, set the speed of the high mixer to 2000rpm, and set the temperature to 145°C; mix tridecyl alcohol polyoxyethylene ether phosphate and ethyl acetate evenly, and add it at a speed of 200ml/min through the nozzle In the high-mixer, at the same time, the speed of the high-mixer is increased to 3000rpm, mixed for 8min, and the ethyl acetate used as the diluent is completely removed to obtain the treated halogen-free flame retardant;

The treated halogen-free flame retardant, polyethylene, styrene-ethylene-butylene-styrene block copolymer, ethylene-propylene rubber, red phosphorus, and antioxidant additives are put into the pressurized internal mixer, and the density is controlled. The maximum pressure of the mixer is 3MPa, and the mixer is mixed to 175°C, so that the various components are mixed evenly to obtain a mixed soft jelly;

The obtained mixed soft jelly was put into a twin-screw extruder connected to a vacuum pump and extruded, and 2,5-dimethyl-2,5-bishexane was fed in the third zone by side feeding. Feeding into the barrel, the temperature of the twin-screw extruder is: 130-145°C in the first zone, 130-145°C in the second zone, 130-145°C in the third zone, 130-145°C in the fourth zone, and 130-130°C in the fifth zone. 145℃, sixth zone 130～145℃, seventh zone 130～145℃, eighth zone 130～145℃, ninth zone 130～145℃, die head 140～155℃, set vacuum pump pressure 0.1～0.2ATM ;

Through the above process, the cable material extruded into pellets can be obtained and packaged after air cooling.

Example 3

Weigh the following components by mass ratio:

Polyethylene 12%, styrene-ethylene-butylene-styrene block copolymer 11%, ethylene propylene rubber 11%, magnesium hydroxide 59%, red phosphorus 2%, tridecanol polyoxyethylene ether phosphate 1.5 %, antioxidant aid 1.97%, ethyl acetate 1.5%, 2,5-dimethyl-2,5-bishexane 0.03%.

Add magnesium hydroxide into the high mixer, set the speed of the high mixer to 2000rpm, and set the temperature to 145°C; mix tridecyl alcohol polyoxyethylene ether phosphate and ethyl acetate evenly, and add it at a speed of 200ml/min through the nozzle In the high-mixer, at the same time, the speed of the high-mixer is increased to 3000rpm, mixed for 8min, and the ethyl acetate used as the diluent is completely removed to obtain the treated halogen-free flame retardant;

The treated halogen-free flame retardant, polyethylene, styrene-ethylene-butylene-styrene block copolymer, ethylene-propylene rubber, red phosphorus, and antioxidant additives are put into the pressurized internal mixer, and the density is controlled. The maximum pressure of the mixer is 3MPa, and the mixer is mixed to 175°C, so that the various components are mixed evenly to obtain a mixed soft jelly;

The obtained mixed soft jelly was put into a twin-screw extruder connected to a vacuum pump and extruded, and 2,5-dimethyl-2,5-bishexane was fed in the third zone by side feeding. Feeding into the barrel, the temperature of the twin-screw extruder is: 130-145°C in the first zone, 130-145°C in the second zone, 130-145°C in the third zone, 130-145°C in the fourth zone, and 130-130°C in the fifth zone. 145℃, sixth zone 130～145℃, seventh zone 130～145℃, eighth zone 130～145℃, ninth zone 130～145℃, die head 140～155℃, set vacuum pump pressure 0.1～0.2ATM ;

Through the above process, the cable material extruded into pellets can be obtained and packaged after air cooling.

Comparative Example 1

Weigh the following components by mass ratio:

Polyethylene 10%, styrene-ethylene-butylene-styrene block copolymer 13%, ethylene propylene rubber 12%, magnesium hydroxide 57%, red phosphorus 4%, vinyl trisilane 1.2%, antioxidant additives 1.58%, ethyl acetate 1.2%, 2,5-dimethyl-2,5-bishexane 0.02%.

Add magnesium hydroxide to the high mixer, set the high mixer speed to 2000rpm and set the temperature to 145°C; mix vinyl trisilane and ethyl acetate evenly, and add it to the high mixer through the nozzle at a speed of 200ml/min, At the same time, the rotating speed of the high mixer was increased to 3000rpm, mixed for 8min, and the ethyl acetate used as the diluent was completely removed to obtain the treated halogen-free flame retardant;

The treated halogen-free flame retardant, polyethylene, styrene-ethylene-butylene-styrene block copolymer, ethylene-propylene rubber, red phosphorus, and antioxidant additives are put into the pressurized internal mixer, and the density is controlled. The maximum pressure of the mixer is 3MPa, and the mixer is mixed to 175°C, so that the various components are mixed evenly to obtain a mixed soft jelly;

The obtained mixed soft jelly was put into a twin-screw extruder connected to a vacuum pump and extruded, and 2,5-dimethyl-2,5-bishexane was fed in the third zone by side feeding. Feeding into the barrel, the temperature of the twin-screw extruder is: 130-145°C in the first zone, 130-145°C in the second zone, 130-145°C in the third zone, 130-145°C in the fourth zone, and 130-130°C in the fifth zone. 145℃, sixth zone 130～145℃, seventh zone 130～145℃, eighth zone 130～145℃, ninth zone 130～145℃, die head 140～155℃, set vacuum pump pressure 0.1～0.2ATM ;

Through the above process, the cable material extruded into pellets can be obtained and packaged after air cooling.

Comparative Example 2

Weigh the following components by mass ratio:

Polyethylene 10%, styrene-ethylene-butylene-styrene block copolymer 13%, ethylene propylene rubber 12%, aluminum hydroxide 57%, red phosphorus 4%, tridecanol polyoxyethylene ether phosphate 1.2 %, antioxidant aid 1.58%, ethyl acetate 1.2%, 2,5-dimethyl-2,5-bishexane 0.02%.

Add aluminum hydroxide into the high mixer, set the high mixer speed to 2000rpm, and set the temperature to 145°C; mix tridecyl alcohol polyoxyethylene ether phosphate and ethyl acetate evenly, and add it at a speed of 200ml/min through the nozzle In the high-mixer, at the same time, the speed of the high-mixer is increased to 3000rpm, mixed for 8min, and the ethyl acetate used as the diluent is completely removed to obtain the treated halogen-free flame retardant;

The treated halogen-free flame retardant, polyethylene, styrene-ethylene-butylene-styrene block copolymer, ethylene-propylene rubber, red phosphorus, and antioxidant additives are put into the pressurized internal mixer, and the density is controlled. The maximum pressure of the mixer is 3MPa, and the mixer is mixed to 175°C, so that the various components are mixed evenly to obtain a mixed soft jelly;

The obtained mixed soft jelly was put into a twin-screw extruder connected to a vacuum pump and extruded, and 2,5-dimethyl-2,5-bishexane was fed in the third zone by side feeding. Feeding into the barrel, the temperature of the twin-screw extruder is: 130-145°C in the first zone, 130-145°C in the second zone, 130-145°C in the third zone, 130-145°C in the fourth zone, and 130-130°C in the fifth zone. 145℃, sixth zone 130～145℃, seventh zone 130～145℃, eighth zone 130～145℃, ninth zone 130～145℃, die head 140～155℃, set vacuum pump pressure 0.1～0.2ATM ;

Through the above process, the cable material extruded into pellets can be obtained and packaged after air cooling.

Comparative Example 3

Weigh the following components by mass ratio:

Polyethylene 10%, styrene-ethylene-butylene-styrene block copolymer 13%, ethylene propylene rubber 12%, magnesium hydroxide 57%, red phosphorus 4%, tridecanol polyoxyethylene ether phosphate 1.2 %, antioxidant aid 1.58%, ethyl acetate 1.2%, 2,5-dimethyl-2,5-bishexane 0.02%.

Add magnesium hydroxide into the high mixer, set the speed of the high mixer to 2000rpm, and set the temperature to 145°C; mix tridecyl alcohol polyoxyethylene ether phosphate and ethyl acetate evenly, and add it at a speed of 200ml/min through the nozzle In the high-mixer, at the same time, the speed of the high-mixer is increased to 3000rpm, mixed for 8min, and the ethyl acetate used as the diluent is completely removed to obtain the treated halogen-free flame retardant;

Put the treated halogen-free flame retardant, polyethylene, styrene-ethylene-butylene-styrene block copolymer, ethylene-propylene rubber, red phosphorus, antioxidant additives, and double-two-five into the pressure mixer In the middle, control the maximum pressure of the internal mixer to 3MPa, and mix it in the internal mixer to 175 ℃, so that the various components are mixed evenly, and the mixed soft jelly is obtained;

The obtained mixed soft jelly is put into a twin-screw extruder connected to a vacuum pump and extruded. The temperature of the twin-screw extruder is: 130-145° C. in the first zone, 130-145° C. in the second zone, and 130-145° C. in the third zone. Zone 130～145℃, Fourth Zone 130～145℃, Fifth Zone 130～145℃, Sixth Zone 130～145℃, Seventh Zone 130～145℃, Eighth Zone 130～145℃, Ninth Zone 130℃ ～145℃, die head 140～155℃, set vacuum pump pressure 0.1～0.2ATM;

Through the above process, the cable material extruded into pellets can be obtained and packaged after air cooling.

Example 4

In this example, the cable materials prepared in Examples 1 to 3 and Comparative Examples 1 to 3, as well as commercially available communication cable insulating cable materials (hereinafter referred to as A cable material), and commercially available low-smoke halogen-free flame retardant cable materials (hereinafter referred to as B Cable material) has been tested for performance, the test method is shown in Table 1, Table 2 is the performance test results of the cable materials prepared in Examples 1 to 3, A cable material, B cable material, and Table 3 is Comparative Examples 1 to 3 The performance test results of the prepared cable material:

Table 1 Test method of cable material performance

Pilot projects testing method Tensile strength/MPa IEC 60811 Elongation at break/% IEC 60811 20℃ volume resistivity/Ω.cm IEC 60167 Dielectric constant GB/T 1409 dielectric loss factor GB/T 1409 Burning test/V0 UL94 Oxygen Index/% ISO 4589-2

Table 2 The cable materials prepared in Examples 1-3 and the performance test results of A cable material and B cable material

As shown in Table 2, comparing the three indicators of ① to ③, it can be seen that the volume resistivity, dielectric constant and dielectric loss factor of commercially available low-smoke halogen-free flame retardant cable materials are significantly lower than those of Examples 1 to 3. The prepared cable material.

It can be seen from the two indicators of ④ and ⑤ that the commercially available communication cable insulating material has no flame retardant effect at all, which will cause the cable to be quickly burned when a fire occurs, and the communication function will be lost. At the same time, the flame spreads rapidly and ignites. The cable material prepared in the embodiment has better flame retardant effect, so in the event of a fire, the cable can ensure normal communication in a short time, and has a certain self-extinguishing performance to slow down the spread of the fire.

Index ⑥ simulates the long-term working condition of the cable under the high temperature of the equipment room. From this index, it can be seen that the properties of the products prepared in each example did not deteriorate significantly after aging, the retention rates of tensile strength and elongation at break were both ≥75%, and the change rate of dielectric constant did not exceed ± 25%, and the change rate of the dielectric loss factor does not exceed ±25%, which shows that Embodiments 1 to 3 can meet the long-term high temperature use of the communication cable.

Index ⑦ simulates the long-term working condition of the cable under high temperature and high humidity conditions. It can be seen from this index that the properties of the products prepared in the examples do not deteriorate significantly after being soaked in hot water. The retention rate of tensile strength and elongation at break are both ≥75%, the change rate of dielectric constant does not exceed ±25%, and the change rate of dielectric loss factor does not exceed ±25%, indicating that the cable materials prepared in Examples 1 to 3 can ensure Communication cables are used for a long time under high temperature and high humidity conditions; compared with the commercially available low-smoke halogen-free flame retardant cable materials, the change rate of dielectric constant is +63.81%, and the change rate of dielectric loss factor is +913.63%. The signal attenuation is very serious, which also shows that the cables made of commercially available low-smoke halogen-free flame-retardant cable materials cannot be used normally under high temperature and high humidity conditions.

Table 3 Test results of various properties of the cable materials prepared in Comparative Examples 1 to 3

The present invention selects tridecyl alcohol polyoxyethylene ether phosphate, a surface treatment agent with very low polarity, to modify the halogen-free flame retardant, which can not only enhance the compatibility between the flame retardant and the base resin, but also improve the Reduce the polarity of halogen-free flame retardants; at the same time, as a diluent, ethyl acetate can not only coat the surface treatment agent tridecyl alcohol polyoxyethylene ether phosphate more uniformly on the surface of the flame retardant, and at the same time at high temperature. After mixing in the high mixer for a certain period of time, it can be fully excluded without affecting the material properties.

In the present invention, when the material is extruded through the twin-screw, the double-two-five is injected into the barrel through the micro-metering pump from the third stage, because the reactivity of the double-two-five at high temperature is very high, if it directly reacts with the resin in the mixer , the air will be in direct contact with the high-temperature compounded rubber, then the oxygen in the air may react with the free radicals generated by the decomposition of double-25, resulting in incomplete utilization of double-25, which in turn leads to fluctuations in the physical and chemical properties of the material.

To sum up, it can be seen that the low dielectric loss halogen-free flame retardant cable material product prepared by the present invention has smooth and smooth appearance, excellent flame retardant performance, and has the characteristics of low polarization loss and low free loss. When transmitting high-frequency signals, it has significant advantages such as good flame retardant performance, small signal attenuation, and long transmission distance.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent substitutions without departing from the spirit and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. a halogen-free flame retardant cable material with low dielectric loss, characterized in that: comprising, Polyethylene, Styrene-Ethylene-Butene-Styrene Block Copolymer, Ethylene-Propylene Rubber, Halogen-Free Flame Retardant, Red Phosphorus, Surface Treatment Agent, Antioxidant Additive, Thinner, 2,5-Dimethyl -2,5-Dihexane. 2. The halogen-free flame-retardant cable material with low dielectric loss as claimed in claim 1, characterized in that: the halogen-free flame-retardant cable material, in terms of mass percentage, the content of each component is: polyethylene 8-15% , styrene-ethylene-butylene-styrene block copolymer 10-15%, ethylene-propylene rubber 10-15%, halogen-free flame retardant 45-60%, red phosphorus 1-4%, surface treatment agent 1- 2%, antioxidant 1-3%, diluent 1-2%, 2,5-dimethyl-2,5-bishexane 0.01-0.05%, the sum of the mass percentages of each component is 100% . 3. The low dielectric loss halogen-free flame retardant cable material according to claim 1, wherein the density of the styrene-ethylene-butylene-styrene block copolymer is 0.910 g/cm ³ , the styrene The content is 33%; the density of the ethylene-propylene rubber is 0.87g/cm ³ , and the mass percentage content of ethylene is 70%. 4 . The halogen-free flame retardant cable material with low dielectric loss according to claim 1 , wherein the halogen-free flame retardant is magnesium hydroxide with a purity of ≥99.5%. 5 . 5 . The halogen-free flame retardant cable material with low dielectric loss according to claim 1 , wherein the surface treatment agent is tridecyl alcohol polyoxyethylene ether phosphate. 6 . 6. The halogen-free flame retardant cable material with low dielectric loss as claimed in claim 1, characterized in that: the antioxidant auxiliary is disulfide and tetra-4,4-biphenyl diphosphite by mass ratio 1:1 co-mixing system. 7 . The halogen-free flame retardant cable material with low dielectric loss according to claim 1 , wherein the diluent is ethyl acetate, and the purity is ≥98%. 8 . 8. A preparation method of low dielectric loss halogen-free flame retardant cable material, characterized in that: comprising, Weigh each component by mass percentage: Add the halogen-free flame retardant into the high-speed mixer, and then add the mixed surface treatment agent and diluent into the high-speed mixer through the nozzle, and mix until the diluent is completely discharged to obtain the treated halogen-free flame retardant; Add the treated halogen-free flame retardant, polyethylene, styrene-ethylene-butylene-styrene block copolymer, ethylene-propylene rubber, red phosphorus, and antioxidant additives into a pressurized internal mixer, and mix. Refined to obtain a soft jelly; The obtained jelly is put into the twin-screw extruder, and 2,5-dimethyl-2,5-bis-hexane is fed into the barrel during this process, and the granular cable material is extruded. Package. 9 . The preparation method of low dielectric loss halogen-free flame retardant cable material according to claim 8 , wherein the twin-screw extruder is connected to a vacuum pump, wherein the temperature in the first zone is 130-145° C., and the temperature in the first zone is 130-145° C. The temperature in the second zone is 130-145°C, the temperature in the third zone is 130-145°C, the temperature in the fourth zone is 130-145°C, the temperature in the fifth zone is 130-145°C, the temperature in the sixth zone is 130-145°C, and the temperature in the sixth zone is 130-145°C. The temperature of the seventh zone is 130-145°C, the temperature of the eighth zone is 130-145°C, the temperature of the ninth zone is 130-145°C, the die temperature is 140-155°C, and the vacuum pump pressure is set to 0.1-0.2ATM. 10. The preparation method of low dielectric loss halogen-free flame retardant cable material according to claim 8, characterized in that: the 2,5-dimethyl-2,5-bishexane is fed into the barrel, wherein , the feeding is by side feeding in the third zone.