CN111909453A - Low-dielectric-loss thermoplastic polypropylene insulating composition at 125 ℃ for coaxial cable and preparation method and application thereof - Google Patents
Low-dielectric-loss thermoplastic polypropylene insulating composition at 125 ℃ for coaxial cable and preparation method and application thereof Download PDFInfo
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- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
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- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
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Abstract
The invention provides a thermoplastic polypropylene insulating composition with low dielectric loss at 125 ℃ for a coaxial cable, and a preparation method and application thereof. The polypropylene insulation composition comprises: 50-100 parts of composite polypropylene resin, 5-20 parts of high-density polyethylene resin, 5-15 parts of linear low-density polyethylene resin, 1.2-2.4 parts of antioxidant, 0.5-1.5 parts of lubricant, 0.5-1.5 parts of rheological agent and 10-40 parts of filler. The invention also provides a preparation method of the composition. The polypropylene composition of the invention can be used as a cable material.
Description
Technical Field
The invention relates to a polypropylene composition, in particular to a low dielectric loss thermoplastic polypropylene insulating composition, belonging to the technical field of polypropylene materials.
Background
As the infrastructure construction of China is continuously increased in recent years, the development of traffic, energy, communication, houses and automobiles brings new development opportunities to the coaxial cable industry. The special structure of the coaxial cable makes the coaxial cable have the characteristics of small radiation loss and strong anti-interference capability, but along with the continuous expansion of mobile communication coverage, the expansion of base station number and the continuous improvement of the requirements on mobile signals, the coaxial cable has higher requirements on radio frequency coaxial cables.
At present, the heat-resistant temperature of a coaxial cable is mainly 105 ℃, signal transmission is unstable when the environmental temperature is higher, signal distortion or too large attenuation is easily caused, and the electrical performance of the material is reduced and the service life is shortened; the irradiation crosslinking heat-resistant temperature of 125 ℃ of the insulating material of the coaxial cable inevitably adds a crosslinking agent or an auxiliary crosslinking agent into the insulating material in order to improve the extrusion processability of the cable, the addition of the auxiliary agent can seriously affect the electrical performance and signal attenuation of the coaxial cable, and the cable after cabling needs electron beam irradiation, thereby increasing the manufacturing cost of the cable and reducing the production efficiency. The coaxial cable usually adopts foamed polyethylene or polyethylene as an insulating layer, but the dielectric property of polyethylene is poor, so that the signal transmission of the cable is influenced, and the overall performance of the cable is adversely affected.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a low dielectric loss thermoplastic polypropylene insulating material which has excellent performance, high heat-resistant temperature, high pay-off speed and stable production process.
The invention also aims to provide a preparation method of the polypropylene insulating material.
It is a further object of the present invention to provide a cable that is heat resistant to 125 c.
In order to achieve any one of the above objects, the present invention provides a low dielectric loss thermoplastic polypropylene insulation composition, which comprises the following raw materials by weight:
in one embodiment of the present invention, the composite polypropylene resin used comprises a first polypropylene resin having a melt index of 0.1g/10min to 0.5g/10min and a second polypropylene resin having a melt index of 3.0 to 4.0g/10 min. In a further embodiment of the present invention, the mass ratio of the first polypropylene resin to the second polypropylene resin is 4-8: 1. In a further embodiment of the invention, the first polypropylene resin used is daqing refined EPS 30R; the second polypropylene resin used was Yanshan petrochemical SP 179.
In the invention, the first polypropylene resin can effectively improve the tensile strength, aging and electrical properties of the low dielectric loss thermoplastic polypropylene insulating composition, and the second polypropylene resin can improve the impact strength, environmental stress cracking resistance, material fluidity and extrusion processing manufacturability of the low dielectric loss thermoplastic polypropylene insulating composition. The two polypropylene resins are mixed for use, so that the polypropylene resins can form a 'bimodal' structure, the physical and mechanical properties, the electrical properties and the processing technology properties of the low dielectric loss thermoplastic polypropylene insulating composition are improved integrally, and the defect of using a single polypropylene resin is overcome.
In one embodiment of the present invention, the high density polyethylene resin has a melt index of 3.0g/10min to 6.0g/10 min; specifically, the adopted high-density polyethylene resin is the Mount mountain petrochemical DMDA-8008.
In one embodiment of the present invention, the linear low density polyethylene resin used has a melt index of 1.5g/10min to 2.5g/10 min; specifically, the linear low-density polyethylene resin used was the Dushan petrochemical DFDA-7042N.
In one embodiment of the present invention, the antioxidant used is at least three selected from the group consisting of antioxidant AO-60, antioxidant AO-80, antioxidant 1024, antioxidant 300 and antioxidant HP-10.
Specifically, the antioxidant is the antioxidant AO-60, the antioxidant 1024 and the antioxidant HP-10 in a weight ratio of 1.5-2.5:1: 1-2.
Specifically, the antioxidant is the antioxidant AO-80, the antioxidant 1024 and the antioxidant HP-10 in a weight ratio of 0.8-1.2:1: 1-2.
Specifically, the antioxidant is antioxidant 300, antioxidant 1024 and antioxidant HP-10, wherein the antioxidant is 1-1.5:1:1-2300 by weight ratio.
Specifically, the antioxidant is 0.8-1.5:0.8-1.5:1 by weight of AO-60, 300 and 1024.
In the invention, the specific antioxidant can effectively improve the heat resistance and the electrical performance of the thermoplastic polypropylene insulating composition with high and low dielectric loss. For the aging of the low dielectric loss thermoplastic polypropylene insulating material, if the traditional antioxidant is used, the addition amount of the antioxidant is greatly increased, which inevitably causes the increase of material cost, and the frost precipitation of the antioxidant in the using process of the cable, thereby influencing the electrical performance and the service performance of the cable. Meanwhile, if a single antioxidant is selected from the materials, the antioxidant cannot protect the aging performance and the cable discoloration of the materials in the production, processing, cable extrusion and use processes no matter how much the antioxidant is added, and the antioxidant for copper is required to be used due to the existence of a metal conductor in the automobile wire. In addition, the synergistic effect of the specific low-polarity antioxidants has certain influence on the electrical performance of the cable.
In one embodiment of the invention, the lubricant employed is polyethylene wax; specifically, the average molecular weight of the lubricant used was 3000-. For example, the polyethylene wax may be Honeywell AC 6A. The adopted rheological agent is a fluoropolymer processing aid; specifically, the content of the adopted fluoropolymer of the rheological agent is more than or equal to 80 percent. For example, the fluoropolymer processing aid can be ruffle chemical PPA2300 MA.
In the invention, the use of the lubricant and the rheological agent is beneficial to improving the problems of die residue accumulation and tape casting, rough cable line surface and incapability of high-speed extrusion processing of the cable in the high-speed extrusion processing process of the low-dielectric-loss thermoplastic polypropylene insulating composition, and can improve the extrusion processing speed and surface smoothness of the cable and be beneficial to improving the electrical performance of the cable.
In one embodiment of the present invention, the filler used is high performance hollow glass microspheres; specifically, the density of the filler used was 0.2g/cm3-0.6g/cm3The particle size (D50) is 45-60 μm. For example, the high performance hollow glass microspheres may be GS40 from medium steel microspheres, inc.
According to the invention, the high-performance hollow glass beads can effectively improve the dielectric property of the low-dielectric-loss thermoplastic polypropylene insulating composition, improve the attenuation of the cable in the signal transmission process and prolong the service life of the cable.
The invention also provides a preparation method of the low dielectric loss thermoplastic polypropylene insulating composition, which comprises the following steps:
the composite polypropylene resin, the high-density polyethylene resin, the linear low-density polyethylene resin, the antioxidant, the lubricant, the rheological agent and the filler are mixed at high speed, discharged after being mixed uniformly, fed into a BUSS high-speed shearing machine, and subjected to plasticization, single-screw granulation and drying to obtain the low-dielectric-loss thermoplastic polypropylene insulating composition.
In one embodiment of the invention, the high speed mixing may be performed in a high speed mixer. The high-speed mixing speed is 200rpm-275rpm, when the temperature is raised to 40 ℃, the high-speed mixing speed is adjusted to 400rpm-450rpm, and the material is discharged at 60 ℃.
In one embodiment of the present invention, the BUSS host screw temperature: 150 +/-10 ℃; temperature of the granulation screw: 180 plus or minus 5 ℃; temperature of the granulator: 185 +/-5 ℃; the variation amplitude of the rotation speed/torque of a screw of the main machine is 450 +/-50/50-70, the rotation speed/torque of a granulating screw is 55 +/-5/50-60, the rotation speed of a granulator is 750 +/-100, the temperature of the upper-stage material is 180 +/-5 ℃, and the pressure of a vacuum pump is 0.5-1.0 bar; the water spraying pressure is 0.5-2 bar.
The invention also provides a cable comprising the low dielectric loss thermoplastic polypropylene insulation composition of the invention. It should be noted that the cable includes, but is not limited to, a coaxial cable.
In the low dielectric loss thermoplastic polypropylene insulating composition, the composite polypropylene resin compounded by two polypropylene resins is adopted, so that the polypropylene resin can form a double-peak structure, the defect of using single resin is overcome, and a complementary effect is achieved; by adopting the composite antioxidant, the heat-resistant temperature and the processing technology performance of the low dielectric loss thermoplastic polypropylene insulating composition are improved on the whole; the addition of the lubricant and the rheological agent improves the problems of die residue deposition and tape casting, rough cable line surface and incapability of high-speed extrusion processing of the cable in the high-speed extrusion processing process of the low-dielectric-loss thermoplastic polypropylene insulating composition, can improve the extrusion processing speed and surface smoothness of the cable, and is beneficial to the improvement of the electrical performance of the cable; meanwhile, the high-performance hollow glass beads can improve the dielectric property of the low dielectric loss thermoplastic polypropylene insulating composition, improve the attenuation of the cable in the signal transmission process and prolong the service life of the cable.
The preparation method of the low dielectric loss thermoplastic polypropylene insulating composition adopts advanced Swiss line production, and has the advantages of stable process, large yield and high efficiency.
Detailed Description
Example 1
The embodiment provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for a coaxial cable, which comprises the following components in parts by weight:
75 parts of composite polypropylene resin; (the mass ratio of the first polypropylene resin to the second polypropylene resin is 6: 1. the first polypropylene resin is Daqing refined EPS30R, and the second polypropylene resin is Yanshan petrochemical SP179)
12.5 parts of high-density polyethylene resin (the melt index is 5.0g/10min, and the Mount mountain petrochemical DMDA-8008);
10 parts of linear low-density polyethylene resin (the melt index is 2.0g/10min, and the Mount-mountain petrochemical DFDA-7042N);
1.8 parts of an antioxidant; (the weight portion ratio of the antioxidant AO-60 to the antioxidant 1024 to the antioxidant HP-10 is 2:1:1, wherein 0.9 portion of the antioxidant AO-60, 0.45 portion of the antioxidant 1024 and 0.45 portion of the antioxidant HP-10)
0.75 part of lubricant (average molecular weight 4000, AC6A from Honeywell Co.);
0.75 part of rheological agent (fluoropolymer processing aid, the content of fluoropolymer is 90%, and the luring chemical PPA2300 MA);
25 parts of filler (density 0.4 g/cm)3GS40 high performance hollow glass bead with a particle size of 50 μm, manufactured by Medium Steel Microbeads).
The preparation method of the thermoplastic polypropylene insulating material with low dielectric loss at 125 ℃ for the coaxial cable comprises the following steps:
the production method comprises the steps of producing by adopting a Swiss import BUSS line, mixing weighed composite polypropylene resin, high-density polyethylene resin, linear low-density polyethylene resin, antioxidant, lubricant, rheological agent and filler at a high speed by adopting a high-speed mixer, discharging after mixing uniformly, feeding the mixture into a BUSS high-speed shearing machine, and obtaining the thermoplastic polypropylene insulating material with low dielectric loss at 125 ℃ for the coaxial cable through plasticizing, single-screw granulation and drying; wherein the parameter of the high-speed mixer is 200-275rpm, when the temperature is raised to 40 ℃, the rotating speed of the high-speed mixer is adjusted to 400-450rpm, and the material is discharged at 60 ℃; BUSS host screw temperature: 150 +/-10 ℃; temperature of the granulation screw: 180 plus or minus 5 ℃; temperature of the granulator: 185 +/-5 ℃; the variation amplitude of the rotation speed/torque of a screw of the main machine is 450 +/-50/50-70, the rotation speed/torque of a granulating screw is 55 +/-5/50-60, the rotation speed of a granulator is 750 +/-100, the temperature of the upper-stage material is 180 +/-5 ℃, and the pressure of a vacuum pump is 0.5-1.0 bar; the water spraying pressure is 0.5-2 bar.
Example 2
The embodiment provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for a coaxial cable, which has the same preparation method as the embodiment 1, except that the raw material components are different, and the insulating material comprises the following components in parts by weight:
100 parts of composite polypropylene resin; (the mass ratio of the first polypropylene resin to the second polypropylene resin is 6:1)
20 parts of high-density polyethylene resin;
15 parts of linear low-density polyethylene resin;
2.4 parts of an antioxidant; (the weight portion ratio of the antioxidant AO-60 to the antioxidant 1024 to the antioxidant HP-10 is 2:1:1, wherein 1.2 portions of the antioxidant AO-60, 0.6 portion of the antioxidant 1024 and 0.6 portion of the antioxidant HP-10)
1.5 parts of a lubricant;
1.5 parts of a rheological agent (fluoropolymer processing aid, fluoropolymer content 90%);
40 parts of filler (high-performance hollow glass beads).
Example 3
The embodiment provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for a coaxial cable, which has the same preparation method as the embodiment 1, except that the raw material components are different, and the insulating material comprises the following components in parts by weight:
50 parts of composite polypropylene resin; (the mass ratio of the first polypropylene resin to the second polypropylene resin is 6:1)
5 parts of high-density polyethylene resin;
5 parts of linear low-density polyethylene resin;
1.2 parts of an antioxidant; (the weight portion ratio of the antioxidant AO-60 to the antioxidant 1024 to the antioxidant HP-10 is 2:1:1, wherein 0.6 portion of the antioxidant AO-60, 0.3 portion of the antioxidant 1024 and 0.3 portion of the antioxidant HP-10)
0.5 part of a lubricant;
0.5 part of rheological agent (fluoropolymer processing aid, fluoropolymer content 90%);
10 parts of filler (high-performance hollow glass beads).
Example 4
The present example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, which has substantially the same formulation components as in example 1, and has the same preparation method, except that: the weight part ratio of the first polypropylene resin to the second polypropylene resin is different and is 4:1, wherein the weight part ratio of the first polypropylene resin is 60 parts, and the weight part ratio of the second polypropylene resin is 15 parts.
Example 5
The present example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, which has substantially the same formulation components as in example 1, and has the same preparation method, except that: the weight part ratio of the first polypropylene resin to the second polypropylene resin is different and is 8: 1.
Example 6
The invention provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for a coaxial cable, which has the same formula components as the embodiment 1, completely the same preparation method and the difference that: the antioxidant is antioxidant AO-80, antioxidant 1024, antioxidant HP-10, and the weight parts of the three are the same as those of the example 1, wherein 0.6 part of antioxidant AO-80, 0.6 part of antioxidant 1024, and 0.6 part of antioxidant HP-10.
Example 7
The present example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, which has substantially the same formulation components as in example 1, and has the same preparation method, except that: the antioxidant comprises 300 parts of antioxidant, 1024 parts of antioxidant and HP-10 parts of antioxidant, and the weight parts of the three are the same as those of the antioxidant in the embodiment 1, wherein 0.675 part of antioxidant 300, 0.45 part of antioxidant 1024 and 0.675 part of antioxidant HP-10.
Example 8
The present example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, which has substantially the same formulation components as in example 1, and has the same preparation method, except that: the antioxidant comprises antioxidant AO-60, antioxidant 300 and antioxidant 1024, and the weight parts ratio of the four ingredients is 1.25:1.25:1, wherein 0.65 part of antioxidant AO-60, 0.65 part of antioxidant 300 and 0.5 part of antioxidant 1024.
Example 9
The present example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, which has substantially the same formulation components as in example 1, and has the same preparation method, except that: the filler is 10 parts.
Example 10
The present example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, which has substantially the same formulation components as in example 1, and has the same preparation method, except that: 40 parts of a filler.
Comparative example 1
The comparative example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, the formula components of the insulating material are basically the same as those of the insulating material in the example 1, the preparation method is completely the same, and the differences are only that: the composite polypropylene resin was not added, and only 75 parts of the first polypropylene resin was added.
Comparative example 2
The comparative example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, the formula components of the insulating material are basically the same as those of the insulating material in the example 1, the preparation method is completely the same, and the differences are only that: 25 parts of composite polypropylene resin was added in the same weight ratio as in example 1.
Comparative example 3
The comparative example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, the formula components of the insulating material are basically the same as those of the insulating material in the example 1, the preparation method is completely the same, and the differences are only that: 130 parts of composite polypropylene resin was added, and the weight ratio of the two was the same as in example 1.
Comparative example 4
The comparative example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, the formula components of the insulating material are basically the same as those of the insulating material in the example 1, the preparation method is completely the same, and the differences are only that: the antioxidant is a single antioxidant, and 1.8 parts of antioxidant AO-60 is added.
Comparative example 5
The comparative example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, the formula components of the insulating material are basically the same as those of the insulating material in the example 1, the preparation method is completely the same, and the differences are only that: the antioxidant is two compound antioxidants, wherein 0.9 part of antioxidant AO-60 and 0.9 part of antioxidant 1024 are added.
Comparative example 6
The comparative example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, the formula components of the insulating material are basically the same as those of the insulating material in the example 1, the preparation method is completely the same, and the differences are only that: no rheology agent was added.
Comparative example 7
The comparative example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, the formula components of the insulating material are basically the same as those of the insulating material in the example 1, the preparation method is completely the same, and the differences are only that: the filler is 5 parts.
Comparative example 8
The comparative example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for coaxial cables, the formula components of the insulating material are basically the same as those of the insulating material in the example 1, the preparation method is completely the same, and the differences are only that: 60 parts of a filler.
Comparative example 9
The comparative example provides a 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for a coaxial cable, the formula components of the insulating material are completely the same as those in example 1, and the preparation method adopts a conventional process: the formula components are manually weighed and put into a high-speed mixer for mixing, and after being mixed for a certain time, the materials are fed into a double-screw extruder for melting, mixing and granulation.
TABLE 1 results of physical Property measurements of examples 1-9 (ref JB/T10437)
TABLE 2 results of physical Property measurements of example 10 and comparative examples 1 to 9 (reference JB/T10437)
As can be seen from examples 1, 4-5 and 1, the first polypropylene resin has a low melt index and a narrow molecular weight distribution, and when used alone, the cable has a reduced pay-off speed and a rough surface, which affects the electrical performance and signal attenuation of the cable.
From the examples 1, 4 to 5, it can be seen that the matching of different proportions of the composite polypropylene resin has a certain influence on the performance of the material: the improvement of the amount of the second polypropylene resin enables the mechanical property and the electrical property of the insulating material to be slightly reduced, mainly because the second polypropylene resin has large melt index and poor crystallinity and molecular chain regularity, but can improve the extrusion cabling speed of the material and the surface smoothness of the cable. The three high-density polyethylenes of the invention are all indispensable.
From example 1, example 4 to example 5 and comparative example 2 to comparative example 3, it can be seen that the excessive reduction of the amount of the composite polypropylene resin causes the filler proportion in the material to be too large, and the excessive filler blocks the movement of the polymer chain segment, thereby reducing the mechanical properties of the material; meanwhile, the surface of the extruded cable is rough and has particles, so that the standard requirement of the coaxial cable cannot be met. The excessive increase of the amount of the composite polypropylene resin reduces the proportion of the filler in the material, leads to the increase of the dielectric loss factor of the material, influences the signal transmission of the coaxial cable and has adverse effect on the overall performance of the cable.
As can be seen from the examples 1, 6 to 8 and the comparative examples 4 to 5, the single antioxidant AO-60 can not make the material meet the requirement of thermal aging, the mechanical property of the material after aging is obviously reduced, and the use requirement of the material can not be met, mainly because the antioxidant AO-60 has poor high-temperature heat stability, the material performance can not be effectively protected in the high-temperature and long-time aging process; the use of the antioxidant compounded by the antioxidant AO-60 and the antioxidant 1024 can not enable the material to meet the requirement of thermal aging, and the mechanical property of the aged material is obviously reduced, so that the cable can crack and can not meet the requirement of the material; in the materials of the examples, three or four antioxidants are compounded, and the aging resistance tests of the materials all pass.
It can be seen from example 1 and comparative example 6 that the absence of the added rheological agent results in reduced speed of paying-off and cabling, residue accumulation of a paying-off die, and rough surface of the cable, mainly because the rheological agent can migrate to the surface of the electric wire when the material is extruded for paying-off, and the wire surface extruded at high speed is protected at the die of the extruder. Due to the absence of the rheological agent, the wire loses lubrication protection when extruded from the die, the wire surface becomes rough and eruptions are formed, slag is formed, and the wire unwinding speed is reduced.
From example 1, example 9 to example 10 and comparative example 7 to comparative example 8, it can be seen that the addition of the filler improves the mechanical properties and the electrical properties of the material, mainly because the high-performance hollow glass beads have excellent fluidity and dispersibility, the glass beads are well combined with the resin matrix interface, the viscosity and the internal stress of the resin can be reduced, the hardness and the elastic modulus of the material are increased, the strength of the material is improved, but the excessive filler causes the surface of the extruded cable to be rough, and the transmission of the coaxial cable signal is influenced. Meanwhile, most of the volume of the hollow glass bead particles is occupied by air, so that the dielectric loss of the material can be reduced, but the extruded cable is rough due to excessive filler in the material, and slag is accumulated at a die, so that the signal transmission attenuation is intensified.
It can be seen from examples 1-10 and comparative example 9 that the productivity is greatly reduced by using the conventional twin-screw melt-kneading granulation method, the production efficiency is reduced by adopting the manual operation method, the product stability and consistency are reduced, and meanwhile, the production efficiency is reduced because no air extractor or air extractor is easy to block during continuous production in the twin-screw production process.
In summary, it can be seen from the examples and comparative examples that the composite polypropylene resin is selected to achieve both the mechanical properties and the surface smoothness of the material. The selection and the compound use of the antioxidant have a key influence on the aging performance of the material, which is the key to whether the temperature resistance grade of the insulating material can be achieved, and the selection of the nonpolar or low-polarity antioxidant can also reduce the dielectric loss factor of the material to a certain extent. The use of the rheological agent improves the problem of slag accumulation of the high-speed extrusion die of the material, improves the line surface quality of the coaxial cable, and improves the signal transmission and attenuation. The Swiss import BUSS production line can be used for greatly improving the production efficiency and stability of materials and ensuring the continuous extrusion stability of coaxial cables.
According to the results in tables 1 and 2, the thermoplastic polypropylene insulating material with low dielectric loss at 125 ℃ for the coaxial cable produced by the Swiss inlet BUSS wire has the advantages of good mechanical property, electrical property, heat resistance, high wire opening speed, good extrusion surface, high efficiency and high yield, and is suitable for producing high-performance coaxial cables. The preparation method of the 125 ℃ low dielectric loss thermoplastic polypropylene insulating material for the coaxial cable has high yield and stable process, the yield can reach 3.5 tons per hour, the preparation method is currently the first domestic manufacturer for producing the insulating material for the coaxial cable by using an imported BUSS wire, breaks through the process of producing by using a conventional internal mixer and a double screw, greatly improves the production efficiency, and is a good material for the future coaxial cable.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A low dielectric loss thermoplastic polypropylene insulation composition comprises the following raw materials in parts by weight:
2. the composition of claim 1, wherein the composite polypropylene resin comprises a first polypropylene resin having a melt index of 0.1-0.5 g/10min and a second polypropylene resin having a melt index of 3.0-4.0g/10 min.
3. The composition of claim 2, wherein the mass ratio of the first polypropylene resin to the second polypropylene resin is 4-8: 1.
4. The composition of claim 2 or 3, wherein the first polypropylene resin is Daqing refined EPS 30R;
preferably, the second polypropylene resin is Yanshan petrochemical SP 179.
5. The composition of claim 1, wherein the high density polyethylene resin has a melt index of 3.0g/10min to 6.0g/10 min; preferably, the high-density polyethylene resin is the Leisha oil DMDA-8008;
the linear low-density polyethylene resin has a melt index of 1.5g/10min-2.5g/10 min; preferably, the linear low density polyethylene resin is the Dushan petrochemical DFDA-7042N.
6. The composition of claim 1, wherein the antioxidant is selected from at least three of the group consisting of antioxidant AO-60, antioxidant AO-80, antioxidant 1024, antioxidant 300, and antioxidant HP-10.
Preferably, the antioxidant is the antioxidant AO-60, the antioxidant 1024 and the antioxidant HP-10 in a weight ratio of 1.5-2.5:1: 1-2;
preferably, the antioxidant is antioxidant AO-80, antioxidant 1024 and antioxidant HP-10 in a weight ratio of 0.8-1.2:1: 1-2;
preferably, the antioxidant is antioxidant 300, antioxidant 1024 and antioxidant HP-10, wherein the antioxidant is the antioxidant with the weight ratio of 1-1.5:1: 1-2300;
preferably, the antioxidant is 0.8-1.5:0.8-1.5:1 by weight of the antioxidant AO-60, the antioxidant 300 and the antioxidant 1024.
7. The composition of claim 1, wherein the lubricant is a polyethylene wax; preferably, the lubricant has an average molecular weight of 3000-;
the rheological agent is a fluoropolymer processing aid; preferably, the content of the fluoropolymer of the rheological agent is more than or equal to 80 percent;
the filler is high-performance hollow glass beads; preferably, the density of the filler is 0.2g/cm3-0.6g/cm3The particle diameter (D50) is 45 μm to 60 μm.
8. A process for preparing the low dielectric loss thermoplastic polypropylene insulation composition of any one of claims 1 to 7 comprising the steps of:
the composite polypropylene resin, the high-density polyethylene resin, the linear low-density polyethylene resin, the antioxidant, the lubricant, the rheological agent and the filler are mixed at high speed, discharged after being mixed uniformly, fed into a BUSS high-speed shearing machine, and subjected to plasticization, single-screw granulation and drying to obtain the low-dielectric-loss thermoplastic polypropylene insulating composition.
9. The preparation method according to claim 8, wherein the rotation speed of the high-speed mixing is 200rpm-275rpm, when the temperature is raised to 40 ℃, the rotation speed of the high-speed mixing is adjusted to 400rpm-450rpm, and when the temperature is 60 ℃, the material is discharged;
BUSS host screw temperature: 150 +/-10 ℃; temperature of the granulation screw: 180 plus or minus 5 ℃; temperature of the granulator: 185 +/-5 ℃; the variation amplitude of the rotation speed/torque of a screw of the main machine is 450 +/-50/50-70, the rotation speed/torque of a granulating screw is 55 +/-5/50-60, the rotation speed of a granulator is 750 +/-100, the temperature of the upper-stage material is 180 +/-5 ℃, and the pressure of a vacuum pump is 0.5-1.0 bar; the water spraying pressure is 0.5-2 bar.
10. A cable comprising the low dielectric loss thermoplastic polypropylene insulation composition of any one of claims 1 to 7.
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| CN202010813110.5A CN111909453B (en) | 2020-08-13 | 2020-08-13 | 125 ℃ low dielectric loss thermoplastic polypropylene insulation composition for coaxial cable and application thereof |
| PCT/CN2020/113167 WO2022032755A1 (en) | 2020-08-13 | 2020-09-03 | Thermoplastic polypropylene insulation composition with low dielectric loss at 125°c for coaxial cables, preparation method therefor and use thereof |
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| CN115873339A (en) * | 2022-05-27 | 2023-03-31 | 江苏上上电缆集团新材料有限公司 | High-electrical-property long-term-aging-resistant high-temperature-resistant polypropylene insulating material and preparation method thereof |
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| CN114539693B (en) * | 2022-03-07 | 2023-03-28 | 宁波市青湖弹性体科技有限公司 | Flame-retardant low-dielectric-constant polypropylene insulating material and preparation method thereof |
| CN115490965B (en) * | 2022-10-27 | 2023-07-04 | 郑州市彦峰塑料包装有限公司 | Food packaging film capable of being heated at high temperature and production process thereof |
| CN117511110B (en) * | 2023-11-09 | 2024-05-10 | 山东方特管业有限公司 | Polypropylene composite material for cable sheath and preparation method thereof |
| CN117343420B (en) * | 2023-12-05 | 2024-02-23 | 润海铁建科技发展有限公司 | Polymer waterproof material and composite waterproof coiled material as well as preparation method and application thereof |
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| EP0849324B1 (en) * | 1996-12-20 | 2003-05-02 | Benecke-Kaliko Aktiengesellschaft | Radio frequency weldable polymer blend |
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