Flame-retardant SFP high-speed wire and preparation method thereof
By preparing flame-retardant SFP high-speed lines using modified PP flame-retardant compounds and specific processes, the problem of unstable flame-retardant performance and SI signal integrity was solved, achieving a balance between cost and benefit and meeting the requirements of VW-1 flame-retardant testing and signal integrity.
Patent Information
- Application Number
- CN202510915584.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-03
- Publication Date
- 2025-11-04
AI Technical Summary
Existing high-speed wires have insufficient flame retardant properties and cannot pass the VW-1 flame retardant test. They also have problems with unstable SI signal integrity, and the FEP compound is expensive and unsuitable for cost-sensitive products.
Modified PP flame-retardant compound is used as the insulation layer. It contains components such as polypropylene, lubricant, decabromodiphenyl ethane and antimony trioxide. Flame-retardant SFP high-speed wire is prepared through specific extrusion and wire pressing processes to ensure that the dielectric and flame-retardant properties of the compound meet the requirements.
It achieves a balance between SI signal integrity and VW-1 flame retardant performance, reduces costs, and meets the product's performance stability and safety requirements.
Smart Images
Figure CN120895321A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of wires, in particular to a flame-retardant SFP high-speed wire and a preparation method thereof. BACKGROUND
[0002] The continuous progress of information technology promotes the continuous iteration and update of communication products, and the demand for high-speed wire products is also increasing. Wire is a branch of SFP high-speed cable, and the core wire of the wire is usually made of conventional adhesive, such as polypropylene, polyethylene, cross-linked polyethylene, foamed polyethylene, etc. as an insulating outer layer. The wire prepared by using the core wire can meet the performance requirements of SI signal integrity, but the flame-retardant performance is insufficient and cannot pass the VW-1 flame-retardant test. When the conventional PP flame-retardant adhesive is used as the core wire insulation to prepare the SAS high-speed wire, the SI signal integrity performance is unstable, so the contradiction between the flame-retardant performance and the SI performance cannot be balanced. At present, only FEP adhesive on the market can solve the above-mentioned contradiction, but the FEP insulating adhesive has the disadvantage of high cost, which is not suitable for popularization on products with cost requirements and is not conducive to product sales. Based on the above-mentioned problem points, it can be found that how to balance the product cost control and the product performance stability and safety is a problem that needs to be solved in the development of high-speed cable. SUMMARY
[0003] In order to solve the above technical problems, the application provides a flame-retardant SFP high-speed wire, which comprises two core wires composed of a center conductor and an insulating layer, a ground wire arranged on both sides of the core wire, and a shielding layer and a polyester tape wrapped outside the core wire and the ground wire; the insulating layer is made of modified PP flame-retardant adhesive, and the modified PP flame-retardant adhesive comprises the following components in parts by weight: 100 parts of polypropylene, 1.5-3 parts of lubricant, 18-29 parts of decabromodiphenyl ethane, 12-20 parts of antimony trioxide, and 0.4-0.9 parts of antioxidant.
[0004] Preferably, the center conductor is one of a silver-plated conductor, a tin-plated conductor and a bare copper conductor.
[0005] Preferably, the shielding layer comprises an aluminum layer and a Mylar layer wrapped outside the aluminum layer, the aluminum layer is tightly attached to the outside of the insulating layer and the ground wire, and the adhesive surface of the polyester tape is tightly adhered to the outside of the Mylar layer.
[0006] Preferably, the polyester tape is composed of a PET layer and a glue layer, and the glue layer is tightly adhered to the outside of the Mylar layer.
[0007] Preferably, a preparation method is used to prepare the above-mentioned flame-retardant SFP high-speed wire, which comprises the following steps:
[0008] S1, preparing modified PP flame-retardant adhesive, comprising the following steps,
[0009] A1. Add the components of the PP flame-retardant compound according to the ratio to a mixer, mix the materials by physical blending for 60 s, and reserve;
[0010] A2. Add the mixed compound to the hopper of a double-screw extruder, and extrude the rubber strip by the double-screw extruder at a temperature of 170-190℃ to complete the first granulation;
[0011] A3. After completing the first granulation, uniformly mix the collected rubber particles by physical mixing, and dry them in an oven at 80℃ for 10 min to ensure that the compound is dry;
[0012] A4. Repeat the above A2 step for the second granulation for the compound that is uniformly mixed and sufficiently dried, and prepare the modified PP flame-retardant compound after the second granulation and cooling and drying.
[0013] S2. After drying the modified PP flame-retardant compound at 80℃ for 4 h, extrude the insulating layer by a wire pressing machine around the conductor to obtain a core wire;
[0014] S3. Place two core wires in parallel, and place two ground wires in parallel on the two sides of the two core wires, wherein the center line of the center conductors of the two core wires coincides with the center line of the two ground wires, and the two parallel ground wires are tightly attached to the outer wall of the core wire, then sequentially wrap the shielding layer and the polyester tape around the outer periphery, and then pass through an oven for curing to ensure that the polyester tape wrapping and the shielding layer are tightly attached, to obtain the flame-retardant SFP high-speed wire.
[0015] Preferably, in step S3, the wrapping direction of the polyester tape is opposite to the wrapping direction of the shielding layer.
[0016] Preferably, in step A2, the screw temperature of the feeding section of the double-screw extruder is set to 80℃, and the temperature of the extrusion melting section is set to: 100℃ for the first section, 150℃ for the second section, 160℃ for the third section, 170℃ for the fourth section, 175℃ for the fifth section, 175℃ for the sixth section, 175℃ for the seventh section, 175℃ for the eighth section, 175℃ for the ninth section, 175℃ for the tenth section, 180℃ for the eleventh section, 180℃ for the twelfth section, and 176℃ for the extruder head.
[0017] Preferably, in step S2, the temperature parameters of each section of the wire pressing machine are set to: 180℃ for the first section, 200℃ for the second section, 215℃ for the third section, 225℃ for the fourth section, 225℃ for the fifth section, and 225℃ for the sixth section.
[0018] As can be seen from the above, the following beneficial effects can be obtained by applying the method provided in this application: through the modified PP compound formulation and modification process of this solution, the dielectric constant and dielectric loss of the compound meet the usage requirements of the outer layer of the core wire insulation, the SI signal integrity test of the obtained insulated core wire meets the product control requirements, and at the same time meets the VW-1 flame retardant performance requirements, taking into account the cost control, product performance stability and safety of wire products. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only a part of the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a structural diagram of a flame-retardant SFP high-speed line according to an embodiment of this application;
[0021] Figure 2 This is a flowchart illustrating the method for preparing a flame-retardant SFP high-speed line according to an embodiment of this application. Detailed Implementation
[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0023] Example 1
[0024] To address the aforementioned technical problems, this embodiment provides a flame-retardant SFP high-speed line, such as... Figure 1 As shown, it includes two core wires consisting of a central conductor 10 and an insulation layer 20, ground wires 30 disposed on both sides of the core wires, and a shielding layer 40 and a polyester wrapping tape 50 covering the outer periphery of the core wires and ground wires 30; the insulation layer 20 is made of modified PP flame retardant rubber, which includes the following components in parts by weight: 100 parts polypropylene, 1.5 to 3 parts lubricant, 18 to 29 parts decabromodiphenyl ethane, 12 to 20 parts antimony trioxide, and 0.4 to 0.9 parts antioxidant.
[0025] Furthermore, the center conductor 10 is one of a silver-plated conductor, a tin-plated conductor, or a bare copper conductor. The shielding layer 40 includes an aluminum layer and a Mylar layer covering the outer periphery of the aluminum layer. The aluminum layer is tightly bonded to the outer side of the insulating layer 20 and the ground wire 30, and the adhesive side of the polyester wrapping tape 50 is tightly bonded to the outer side of the Mylar layer. The polyester wrapping tape 50 is composed of a PET layer and an adhesive layer, with the adhesive layer tightly bonded to the outer side of the Mylar layer.
[0026] On the other hand, this embodiment provides a preparation method for preparing the above-mentioned flame-retardant SFP high-speed line, such as... Figure 2 As shown, it includes the following steps:
[0027] S1. Preparation of modified PP flame-retardant compound, including the following steps:
[0028] A1. Add the components of the PP flame retardant compound to the mixer according to the ratio, and mix the materials by physical blending for 60 seconds, then set aside.
[0029] Preferably, in this step, 100 parts of PP resin, 2 parts of dispersant, 23 parts of decabromodiphenyl ethane, 15 parts of antimony trioxide, and 0.6 parts of antioxidant are weighed sequentially and then placed into a mixer for mixing.
[0030] A2. Add the mixed batch material to the hopper of a twin-screw extruder, and extrude the rubber strip through the twin screw at a temperature of 170-190℃ to complete the first granulation.
[0031] In step A2 of this embodiment, the mixed material is then transferred to a twin-screw extruder for granulation. The screw temperature of the twin-screw feed section is set to 80°C, and the extrusion melting section temperatures are set as follows: 100°C for the first section, 150°C for the second section, 160°C for the third section, 170°C for the fourth section, 175°C for the fifth section, 175°C for the sixth section, 175°C for the seventh section, 175°C for the eighth section, 175°C for the ninth section, 175°C for the tenth section, 180°C for the eleventh section, and 180°C for the twelfth section. The extruder head temperature is 176°C.
[0032] A3. After the first granulation is completed, the collected granules are physically mixed evenly and dried in an oven at 80℃ for 10 minutes to ensure the rubber compound is dry;
[0033] A4. Repeat step A2 above to granulate the well-mixed and fully dried rubber compound a second time. After cooling and drying, the rubber compound after the second granulation is used to prepare the modified PP flame retardant rubber compound. In this step, the temperature of the twin-screw extruder is the same during the first and second granulation.
[0034] S2. After drying the modified PP flame-retardant compound at 80℃ for 4 hours, an insulation layer is formed on the outer periphery of the central conductor using a wire extrusion machine, thereby obtaining a flame-retardant core wire. The diameter of the central conductor is 0.26 mm, and the thickness of the insulation layer is 0.21 mm.
[0035] In step S2, the temperature parameters of each segment of the wire pressing machine are set as follows: first segment temperature 180℃, second segment temperature 200℃, third segment temperature 215℃, fourth segment temperature 225℃, fifth segment temperature 225℃, and sixth segment temperature 225℃.
[0036] S3. Two core wires are placed parallel to each other, and two ground wires are placed parallel to each other on both sides of the two core wires. The center line connecting the center conductors of the two core wires coincides with the center line connecting the two ground wires, and the two parallel ground wires are tightly attached to the outer wall of the core wires. Then, a shielding layer and a polyester wrapping tape are wrapped around the outer perimeter in sequence, with the wrapping direction of the polyester wrapping tape opposite to that of the shielding layer. The circuit is then cured in an oven to ensure a tight fit between the polyester wrapping tape and the shielding layer, resulting in a flame-retardant SFP high-speed cable.
[0037] Example 2
[0038] This embodiment provides a method for preparing flame-retardant SFP high-speed wires. Unlike Embodiment 1, the modified PP flame-retardant compound in this embodiment comprises the following components by weight: 100 parts PP resin, 2 parts dispersant, 23 parts decabromodiphenyl ethane, 15 parts antimony trioxide, and 0.6 parts antioxidant. The remaining steps are the same as in Embodiment 1, resulting in a flame-retardant core wire.
[0039] Example 3
[0040] This embodiment provides a method for preparing flame-retardant SFP high-speed wires. Unlike Example 1, the modified PP flame-retardant compound in this embodiment comprises the following components by weight: 100 parts PP resin, 2 parts dispersant, 29 parts decabromodiphenyl ethane, 20 parts antimony trioxide, and 0.8 parts antioxidant. The remaining steps are the same as in Example 1, resulting in a flame-retardant core wire.
[0041] Example 4
[0042] This embodiment provides a method for preparing flame-retardant SFP high-speed wires. Unlike Example 1, the modified PP flame-retardant compound in this embodiment comprises the following components by weight: 100 parts PP resin, 1.5 parts dispersant, 18 parts decabromodiphenyl ethane, 12 parts antimony trioxide, and 0.5 parts antioxidant. The remaining steps are the same as in Example 1, resulting in a flame-retardant core wire.
[0043] Comparative Example 1
[0044] This embodiment provides a method for preparing flame-retardant SFP high-speed wires. Unlike embodiment 1, this embodiment uses only 100 parts of PP resin as the adhesive for the insulating layer. The remaining steps are the same as in embodiment 1, and a flame-retardant core wire is obtained.
[0045] Comparative Example 2
[0046] This embodiment provides a method for preparing flame-retardant SFP high-speed wires. Unlike Embodiment 1, the modified PP flame-retardant adhesive used in the insulation layer of this embodiment is composed of the following parts by weight: 100 parts PP resin, 5 parts dispersant, 23 parts decabromodiphenyl ethane, 15 parts antimony trioxide, and 0.6 parts antioxidant. The parts are weighed according to the granulation weight ratio and then put into a mixer. The remaining steps are the same as in Embodiment 1 to obtain the flame-retardant core wire.
[0047] Comparative Example 3
[0048] This embodiment provides a method for preparing flame-retardant SFP high-speed wires. Unlike Example 1, the modified PP flame-retardant adhesive in this embodiment is composed of the following parts by weight: 100 parts PP resin, 2 parts dispersant, 35 parts decabromodiphenyl ethane, 28 parts antimony trioxide, and 0.9 parts antioxidant. The remaining steps are the same as in Example 1, and a flame-retardant core wire is obtained.
[0049] Comparative Example 4
[0050] This embodiment provides a method for preparing flame-retardant SFP high-speed wires. Unlike Example 1, the modified PP flame-retardant adhesive in this embodiment is composed of the following parts by weight: 100 parts PP resin, 1 part dispersant, 23 parts decabromodiphenyl ethane, 15 parts antimony trioxide, and 0.6 parts antioxidant. The remaining steps are the same as in Example 1, and flame-retardant core wires are obtained.
[0051] Comparative Example 5
[0052] This embodiment provides a method for preparing flame-retardant SFP high-speed wires. Unlike Embodiment 1, the modified PP flame-retardant adhesive in this embodiment is composed of the following parts by weight: 100 parts PP resin, 1.5 parts dispersant, 18 parts decabromodiphenyl ethane, 12 parts antimony trioxide, and 0.5 parts antioxidant. The remaining steps are the same as in Embodiment 1 to obtain the flame-retardant core wire.
[0053]
[0054]
[0055] Table 1
[0056]
[0057]
[0058] Table 2
[0059] Table 1 above shows the formulation of the adhesive used in the insulation layer of Examples 1-4 and Comparative Examples 5-9. Table 2 shows the test data of the flame-retardant core wires of Examples 1-4 and Comparative Examples 5-9, including SI signal integrity test and VW-1 flame retardant test.
[0060] As shown in Table 1-2 above, the difference between Example 1 and Example 2 lies in the amount of dispersant used. Test results show that increasing the amount of dispersant increases the dielectric constant and dielectric loss of the PP flame-retardant compound, worsens the SI signal integrity performance of the wire, and shortens the flame-retardant time in the VW-1 combustion test.
[0061] The difference between Example 1 and Example 3 lies in the amount of flame retardant used. Test results show that increasing the amount of flame retardant results in higher dielectric constant and dielectric loss in the PP flame-retardant compound, poorer SI signal integrity performance of the wire, and a shorter flame delay time in the VW-1 combustion test.
[0062] The difference between Example 1 and Example 4 lies in the amount of flame retardant used. Test results show that reducing the amount of flame retardant results in lower dielectric constant and dielectric loss in the PP flame-retardant compound, better SI signal integrity performance of the wire, and increased flame delay time in the VW-1 combustion test.
[0063] The difference between Comparative Example 1 and other embodiments and comparative examples is that no flame retardants or other modifying agents were added. Test results show that the core wire without added modifying agents has a lower dielectric constant and dielectric loss, lower SI signal integrity test data, and less signal loss, but it fails the VW-1 combustion test.
[0064] The difference between Example 2 and Comparative Example 2 lies in the amount of dispersant used. Test results show that further increasing the amount of dispersant increases its proportion in the formulation system, leading to a higher overall polarity of the adhesive compound. This results in increased dielectric constant and dielectric loss in the PP flame-retardant adhesive compound, and a deterioration in the SI signal integrity performance of the wire. Furthermore, because the dispersant is not flame-retardant, the flame delay time in the VW-1 combustion test becomes longer.
[0065] The difference between Example 3 and Comparative Example 3 lies in the amount of flame retardant used. Test results show that with a further increase in the amount of flame retardant added, the solid content of the formulation increases, the core wire insulation becomes rougher, and the SI signal integrity is significantly attenuated.
[0066] The difference between Example 1 and Comparative Example 4 lies in the amount of dispersant used. Test results show that as the amount of dispersant continuously decreased, the dispersibility worsened, resulting in a rougher appearance of the core wire insulation, significant filler agglomeration, poor dielectric uniformity, failure to pass the SI signal integrity test, and failure to pass the VW-1 flame retardant performance test.
[0067] The difference between Example 4 and Comparative Example 5 lies in the amount of flame retardant used. Test results show that with a further reduction in the amount of flame retardant added, VW-1 failed the flame retardancy test.
[0068] Compared with Examples 2, 2, and 4, Example 1 differs in the amount of dispersant added. Test results show that when the amount of dispersant added is within the range of 1.5-3 parts, the dielectric constant and dielectric loss of the adhesive meet the requirements for the outer insulation layer of the core wire, and the SI signal integrity test meets product control requirements, while also meeting the VW-1 flame retardant performance requirements. Adding more dispersant than the set range results in failure of both the SI signal integrity and VW-1 flame retardant performance tests. Excessive dispersant addition will affect the SI signal integrity of the wire; insufficient dispersant addition will result in failure of the VW-1 flame retardant test and increased roughness.
[0069] Compared with Examples 3, 7, and 9, Example 1 differs in the content of added flame retardants. Test results show that when the amounts of the flame retardants decabromodiphenyl ethane and antimony trioxide are in the ranges of 18-29 and 10-20 parts respectively, the dielectric constant and dielectric loss of the adhesive meet the requirements for the outer insulation layer of the core wire. Furthermore, the SI signal integrity test meets product control requirements, and the VW-1 flame retardant performance requirements are also met. If the amount of flame retardant added exceeds the set limit, the SI signal integrity test will fail; if the amount added is less than the set limit, the VW-1 flame retardant test will fail. By improving the PP adhesive to replace the FEP adhesive as the core wire insulation layer, and because PP adhesive is much cheaper than FEP adhesive, the wire can simultaneously meet the SI signal integrity test requirements, product control requirements, and VW-1 flame retardant performance requirements, achieving a balance between cost control, product performance stability, and safety.
[0070] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.
Claims
1. A flame-retardant SFP high-speed line, characterized in that: It includes two core wires consisting of a central conductor (10) and an insulating layer (20), ground wires (30) disposed on both sides of the core wires, and a shielding layer (40) and a polyester wrapping tape (50) covering the outer periphery of the core wires and ground wires (30); the insulating layer (20) is made of modified PP flame retardant rubber, which includes the following components in parts by weight: 100 parts polypropylene, 1.5 to 3 parts lubricant, 18 to 29 parts decabromodiphenyl ethane, 12 to 20 parts antimony trioxide, and 0.4 to 0.9 parts antioxidant.
2. The flame-retardant SFP high-speed line according to claim 1, characterized in that: The center conductor (10) is one of silver-plated conductor, tin-plated conductor, or bare copper conductor.
3. The flame-retardant SFP high-speed line according to claim 1, characterized in that: The shielding layer (40) comprises an aluminum layer and a Mylar layer covering the outer periphery of the aluminum layer. The aluminum layer is closely attached to the outer side of the insulating layer (20) and the ground wire (30). The adhesive side of the polyester tape (50) is tightly bonded to the outer side of the Mylar layer.
4. The flame-retardant SFP high-speed line according to claim 2, characterized in that: The polyester tape (50) is composed of a PET layer and an adhesive layer, with the adhesive layer tightly bonded to the outside of the Mylar layer.
5. A preparation method for preparing the flame-retardant SFP high-speed line according to any one of claims 1-4, characterized in that: Includes the following steps: S1. Preparation of modified PP flame-retardant compound, including the following steps: A1. Add the components of the modified PP flame retardant compound to the mixer according to the ratio, and mix the compound by physical blending for 60 seconds, then set aside. A2. Add the mixed batch material to the hopper of a twin-screw extruder, and extrude the rubber strip through the twin screw at a temperature of 170-190℃ to complete the first granulation. A3. After the first granulation is completed, the collected granules are physically mixed evenly and dried in an oven at 80℃ for 10 minutes to ensure the rubber compound is dry; A4. Repeat step A2 above to granulate the well-mixed and fully dried rubber compound a second time. After cooling and drying, the rubber compound after the second granulation is used to prepare the modified PP flame retardant rubber compound. S2. After the modified PP flame-retardant rubber compound is dried at 80℃ for 4 hours, it is extruded on the outer periphery of the central conductor by a wire extrusion machine to form an insulation layer, thereby obtaining the core wire; S3. Two core wires are placed in parallel, and two ground wires are placed in parallel on both sides of the two core wires. The center line connecting the center conductors of the two core wires coincides with the center line connecting the two ground wires, and the two parallel ground wires are tightly attached to the outer wall of the core wires. Then, a shielding layer and polyester tape are wrapped around the outer perimeter in sequence, and then cured in an oven to ensure that the polyester tape wrapping is tightly attached to the shielding layer, thus obtaining a flame-retardant SFP high-speed line.
6. The preparation method according to claim 5, characterized in that: In step S3, the wrapping direction of the polyester tape is opposite to the wrapping direction of the shielding layer.
7. The preparation method according to claim 5, characterized in that: In step A2, the screw temperature of the twin-screw feeding section is set to 80℃, and the extrusion melting section temperature is set as follows: first section 100℃, second section 150℃, third section 160℃, fourth section 170℃, fifth section 175℃, sixth section 175℃, seventh section 175℃, eighth section 175℃, ninth section 175℃, tenth section 175℃, eleventh section 180℃, twelfth section 180℃, and the extruder head temperature is 176℃.
8. The preparation method according to claim 5, characterized in that: In step S2, the temperature parameters of each segment of the wire pressing machine are set as follows: first segment temperature 180℃, second segment temperature 200℃, third segment temperature 215℃, fourth segment temperature 225℃, fifth segment temperature 225℃, and sixth segment temperature 225℃.