HDPE (high-density polyethylene) solid insulation material for network cable and preparation method of HDPE solid insulation material

Abstract

The invention belongs to the technical field of network cable materials, and particularly relates to an HDPE solid insulation material for network cables and a preparation method of the HDPE solid insulation material. The composite material comprises the following components in parts by weight: 65-75 parts of HDPE, 10-20 parts of LLDPE, 5-10 parts of an ethylene-octylene copolymer, 2-5 parts of nano silicon dioxide, 0.5-1 part of an antioxidant, 0.5-1 part of an ultraviolet light absorber, 0.5-2 parts of a lubricant and 0.5-1 part of a coupling agent. Adding into a high-speed mixer and mixing to obtain a premix; and adding the premix into a twin-screw extruder to obtain the HDPE solid insulation material for the network cable. Through reasonable formula design and optimized preparation process, the HDPE solid insulation material for the network cable, which is excellent in physical property, good in dielectric property and relatively good in environment resistance and meets the actual use requirements of the network cable, is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of network cable materials, and particularly relates to a HDPE solid insulating material for network cables and a preparation method thereof. Background Art

[0002] With the rapid development of internet technology, the demand for network communications is growing. As a crucial carrier of network transmission, the performance of network cables is crucial. Insulation, a key component of network cables, has a direct impact on their signal transmission quality, anti-interference capabilities, and service life. Currently, commonly used network cable insulation materials are extruded and granulated using a blend of high-density polyethylene (HDPE) and low-density polyethylene (LDPE). However, these materials present several challenges in practical use, including suboptimal dielectric properties, leading to signal attenuation and interference during transmission; poor material stability and environmental resistance, resulting in aging and performance degradation in harsh environments such as high temperature and humidity, impacting the cable's performance; and poor flexibility, which limits flexibility in routing cables in confined spaces. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a HDPE solid insulation material for network cables and a preparation method thereof.

[0004] The specific technical scheme is as follows: a method for preparing HDPE solid insulation material for network cables, comprising, by weight: 65-75 parts of HDPE, 10-20 parts of LLDPE, 5-10 parts of ethylene-octene copolymer, 2-5 parts of nano-silicon dioxide, 0.5-1 part of antioxidant, 0.5-1 part of ultraviolet absorber, 0.5-2 parts of lubricant and 0.5-1 part of coupling agent; Preparation steps: S1. Weigh the raw materials according to the above weight parts, add HDPE, LLDPE, and ethylene-octene copolymer into a high-speed mixer at a speed of 500-800 rpm and mix for 5-8 min; S2, continue to add nano-silica, antioxidant, ultraviolet absorber, lubricant and coupling agent to the high-speed mixer, rotate at 500-800 rpm, and continue mixing for 5-8 minutes to obtain a premix; S3. Add the premix into a twin-screw extruder, melt and extrude at 170-210°C, set the main engine speed to 300-400 rpm, open the vacuum pressure to 0.06MPa-0.09MPa, and the die pressure ≤15MPa. After water cooling and pelletizing, HDPE solid insulation material for network cables is obtained.

[0005] Preferably, the antioxidant is a compound of a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 2:1.

[0006] Preferably, 65 parts of HDPE, 20 parts of LLDPE, 10 parts of ethylene-octene copolymer, 2 parts of nano-silica, 1 part of antioxidant, 0.5 parts of benzophenone ultraviolet absorber, 1 part of zinc stearate and 0.5 parts of silane coupling agent.

[0007] Preferably, HDPE 70 parts, LLDPE 20 parts, ethylene-octene copolymer 5 parts, nano-silica 3 parts, antioxidant 0.5 parts, benzophenone ultraviolet absorber 0.5 parts, zinc stearate 0.5 parts and silane coupling agent 0.5 parts.

[0008] Preferably, the composition comprises 75 parts of HDPE, 10 parts of LLDPE, 5 parts of ethylene-octene copolymer, 5 parts of nano-silicon dioxide, 1 part of antioxidant, 1 part of benzophenone ultraviolet absorber, 2 parts of zinc stearate and 1 part of silane coupling agent.

[0009] Preferably, in step S1 and step S2, the high-speed mixer is set to a rotation speed of 800 rpm and the mixing is performed for 5 minutes.

[0010] Preferably, in step S1, the high-speed mixer rotates at a speed of 500 rpm and mixes for 8 minutes; in step S2, the high-speed mixer rotates at a speed of 800 rpm and mixes for 5 minutes.

[0011] The HDPE solid insulation material for network cables is prepared by the above preparation method.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The network cable insulation material prepared by the present invention has excellent mechanical properties, good processing fluidity, and good environmental resistance; 2. It improves the dielectric properties of traditional HDPE network cable insulation materials, reduces attenuation and interference during signal transmission, and helps improve the signal transmission quality of the network cable; 3. The present invention improves the flexibility of HDPE network cable insulation materials, and has good wiring flexibility; In summary, the present invention obtains HDPE solid insulation material for network cables with excellent physical properties, good dielectric properties, good environmental resistance, and meeting the actual use requirements YD / T760-95 of network cables through reasonable formula design and optimized preparation process. DETAILED DESCRIPTION

[0013] To facilitate understanding of the present invention, the present invention will be described in more detail below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the present invention more thorough and comprehensive.

[0014] Example 1: Preparation method of HDPE solid insulation material for network cable: weigh 65 parts of HDPE, 20 parts of LLDPE, 10 parts of ethylene-octene copolymer, 2 parts of nano-silica, 1 part of antioxidant (a compound of hindered phenol antioxidant and phosphite antioxidant, mass ratio 2:1), 0.5 part of benzophenone ultraviolet absorber, 1 part of zinc stearate, and 0.5 part of silane coupling agent.

[0015] The preparation method is as follows: S1. First, add HDPE, LLDPE and ethylene-octene copolymer into a high-speed mixer, set the speed to 800 rpm, and mix for 5-8 minutes.

[0016] S2. Add nano-silica, antioxidant, benzophenone ultraviolet absorber, zinc stearate and silane coupling agent, keep the high-speed mixer at the same speed, and continue mixing for 5-8 minutes to obtain a premix.

[0017] S3. Then add the premix into a twin-screw extruder, melt and extrude at 170℃-190℃, set the main engine speed to 300-400 rpm, open the vacuum pressure to 0.06MPa-0.09MPa, and the head pressure ≤15MPa. After water cooling and pelletizing, finally obtain HDPE solid insulation material for network cable.

[0018] Example 2: Preparation method of HDPE solid insulation material for network cable: weigh 70 parts of HDPE, 20 parts of LLDPE, 5 parts of ethylene-octene copolymer, 3 parts of nano-silica, 0.5 parts of antioxidant, 0.5 parts of benzophenone ultraviolet absorber, 0.5 parts of zinc stearate, and 0.5 parts of silane coupling agent.

[0019] The preparation method is as follows: S1. First, add HDPE, LLDPE and ethylene-octene copolymer into a high-speed mixer, set the speed to 800 rpm, and mix for 5 minutes.

[0020] S2. Add nano-silica, antioxidant, benzophenone-based UV absorber, zinc stearate and silane coupling agent, keep the high-speed mixer at the same speed, and continue mixing for 5 minutes to obtain a premix.

[0021] S3. Then add the premix into a twin-screw extruder, melt extrude at 190°C, set the main engine speed to 300-400 rpm, open the vacuum pressure to 0.06MPa-0.09MPa, and the head pressure ≤15MPa. After water cooling and pelletizing, HDPE solid insulation material for network cables is obtained.

[0022] Example 3: Preparation method of HDPE solid insulation material for network cable: weigh 75 parts of HDPE, 10 parts of LLDPE, 5 parts of ethylene-octene copolymer, 5 parts of nano-silica, 1 part of antioxidant, 1 part of benzophenone ultraviolet absorber, 2 parts of zinc stearate, and 1 part of silane coupling agent.

[0023] The preparation method is as follows: S1. First, add HDPE, LLDPE and ethylene-octene copolymer into a high-speed mixer, set the speed to 500 rpm, and mix for 8 minutes; S2. Add nano-silica, antioxidant, benzophenone-based UV absorber, zinc stearate and silane coupling agent into the high-speed mixer, rotate at 800 rpm, and continue mixing for 5 minutes to obtain a premix.

[0024] S3. Then add the premix into a twin-screw extruder, melt extrude at 210°C, set the main engine speed to 300-400 rpm, open the vacuum pressure to 0.06MPa-0.09MPa, and the die pressure ≤15MPa. After water cooling and pelletizing, HDPE solid insulation material for network cables is obtained.

[0025] Comparative Example: Weigh, by weight, 65 parts HDPE, 20 parts LDPE, 10 parts ethylene-octene copolymer, 2 parts nano-silica, 1 part antioxidant (a combination of hindered phenol antioxidant and phosphite antioxidant, mass ratio 2:1), 0.5 part benzophenone UV absorber, 1 part zinc stearate, and 0.5 part silane coupling agent. The preparation method is the same as in Example 1. In step S1, HDPE, LDPE, and ethylene-octene copolymer are added and mixed.

[0026] All raw materials used in this application are commercially available. A summary of the formulations for Examples 1-3 and the comparative examples is shown in Table 1. The relevant properties of the network cable materials produced in Examples 1-3 and the comparative examples were tested, and the test results and corresponding testing standards are shown in Table 2. The technical requirements for HDPE solid insulation materials in the communications industry standard are shown in Table 3, which are from "Polyolefin Insulation Materials for Urban Communications Cables YD / T760-95."

[0027] Table 1 Summary of formulas for Examples 1-3 and Comparative Examples Table 2 Performance test results of network cable materials obtained in Examples 1-3 and Comparative Examples Table 3 HDPE solid insulation material related technical requirements As shown in Table 2, Examples 1-3 significantly outperform the Comparative Example in terms of tensile strength, elongation at break, and environmental stress cracking resistance. This demonstrates that the HDPE solid insulation materials for network cables prepared in these Examples exhibit excellent physical properties and good environmental resistance. Furthermore, the dielectric constant, dielectric loss factor, and volume resistivity demonstrate good dielectric properties, which helps reduce attenuation and interference during signal transmission, improve the signal transmission quality of the network cable, and stabilize signal transmission. Furthermore, Table 3 demonstrates that the HDPE solid insulation materials prepared in Examples 1-3 and the Comparative Example meet the relevant technical requirements of YDT760-95.

[0028] After testing, the HDPE solid insulation material for network cables prepared by the present invention has excellent physical properties, good dielectric properties and good environmental resistance, and meets the actual use requirements YD / T760-95 for network cables.

[0029] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A method for preparing HDPE solid insulation material for network cables, characterized in that: The composition comprises, by weight: 65-75 parts of HDPE, 10-20 parts of LLDPE, 5-10 parts of ethylene-octene copolymer, 2-5 parts of nano-silicon dioxide, 0.5-1 part of antioxidant, 0.5-1 part of ultraviolet absorber, 0.5-2 parts of lubricant and 0.5-1 part of coupling agent; Preparation steps: S1. Weigh the raw materials according to the above weight parts, add HDPE, LLDPE, and ethylene-octene copolymer into a high-speed mixer at a speed of 500-800 rpm and mix for 5-8 minutes; S2, continue to add nano-silica, antioxidant, ultraviolet absorber, lubricant and coupling agent to the high-speed mixer, rotate at 500-800 rpm, and continue mixing for 5-8 minutes to obtain a premix; S3. Add the premix into a twin-screw extruder, melt and extrude at 170-210°C, set the main engine speed to 300-400 rpm, open the vacuum pressure to 0.06MPa-0.09MPa, and the die pressure ≤15MPa. After water cooling and pelletizing, HDPE solid insulation material for network cables is obtained.

2. The method for preparing HDPE solid insulation material for network cable according to claim 1, characterized in that: The antioxidant is a compound of a hindered phenol antioxidant and a phosphite antioxidant, with a mass ratio of 2:

1.

3. The method for preparing HDPE solid insulation material for network cable according to claim 2, characterized in that: 65 parts of HDPE, 20 parts of LLDPE, 10 parts of ethylene-octene copolymer, 2 parts of nano-silicon dioxide, 1 part of antioxidant, 0.5 parts of benzophenone ultraviolet absorber, 1 part of zinc stearate and 0.5 parts of silane coupling agent.

4. The method for preparing HDPE solid insulation material for network cable according to claim 2, characterized in that: 70 parts of HDPE, 20 parts of LLDPE, 5 parts of ethylene-octene copolymer, 3 parts of nano-silicon dioxide, 0.5 parts of antioxidant, 0.5 parts of benzophenone ultraviolet absorber, 0.5 parts of zinc stearate and 0.5 parts of silane coupling agent.

5. The method for preparing HDPE solid insulation material for network cable according to claim 2, characterized in that: 75 parts of HDPE, 10 parts of LLDPE, 5 parts of ethylene-octene copolymer, 5 parts of nano-silicon dioxide, 1 part of antioxidant, 1 part of benzophenone ultraviolet absorber, 2 parts of zinc stearate and 1 part of silane coupling agent.

6. The method for preparing HDPE solid insulation material for network cables according to claim 1, characterized in that: In step S1 and step S2, the high-speed mixer is set to a rotation speed of 800 rpm and the mixing is performed for 5 minutes.

7. The method for preparing HDPE solid insulation material for network cables according to claim 1, characterized in that: In step S1, the high-speed mixer rotates at a speed of 500 rpm and mixes for 8 minutes; in step S2, the high-speed mixer rotates at a speed of 800 rpm and mixes for 5 minutes.

8. HDPE solid insulation material for network cables prepared by the preparation method according to any one of claims 1 to 7.

Images