CN102295801B - Physical foam insulating material for high-compression-resistance railway digital signal cable and preparation as well as application thereof - Google Patents
Physical foam insulating material for high-compression-resistance railway digital signal cable and preparation as well as application thereof Download PDFInfo
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- CN102295801B CN102295801B CN 201010209553 CN201010209553A CN102295801B CN 102295801 B CN102295801 B CN 102295801B CN 201010209553 CN201010209553 CN 201010209553 CN 201010209553 A CN201010209553 A CN 201010209553A CN 102295801 B CN102295801 B CN 102295801B
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Abstract
The invention relates to a physical foam insulating material for a high-compression-resistance railway digital signal cable and preparation as well as application thereof. The physical foam insulating material for the railway digital signal cable comprises the following components in percentage by weight: 50-80 percent of polypropylene, 17-47 percent of low-density polyethylene, 0.1-1 percent of nucleating agent, 0.2-1 percent of antioxidant and 0.2-1 percent of lubricating agent. The invention also discloses preparation and application of the insulating material. Compared with the prior art, the prepared physical foam insulating material for the railway digital signal cable has the characteristics of stable production process, uniform core wire foam, high compression resistance and the like.
Description
Technical field
The present invention relates to technical field of polymer materials, relate in particular to a kind of high resistance compression railway digital signal cable physical foam insulation material and preparation method thereof and application.
Background technology
According to Ministry of Railways's Mid-term and Long-term Plan of the Railway Network, from 2005 to the year two thousand twenty, the Ministry of Railways will drop into 2,000,000,000,000 funds and carry out railway construction, make an investment in every year on average more than 1,000 hundred million yuan.From 2004, the railway fixed assets investment began to increase, and according to medium-term and long-term plans, since 2006 to 2010, estimated the annual railway fixed assets investment that 1,600 hundred million yuan of left and right are arranged.To the year two thousand twenty, the china railway revenue kilometres by 2004 7.2 ten thousand kilometers reach 100,000 kilometers, newly-increased 2.8 ten thousand kilometers, existing railway is carried out 3.5 ten thousand kilometers of electrification innovations.
Therefore, within longer for some time from now on, greatly developing of the track traffic industries such as railway will pull the develop rapidly of industry industrial chain, give cable industry particularly physical blowing railway digital cable industry bring unprecedented opportunity to develop and new round investment fever.
At present, railway digital signal cable mostly is HDPE insulating material with the physical foam insulation material, as HE4873, the HE1106 etc. of Borealis.But also there is certain shortcoming in high density polyethylene(HDPE), and is relatively poor with the wide degree of the physical blowing cable abscess of its production, the anti-compression properties that is cable is relatively poor, when cable joining or in the subsequent applications process, abscess easily subsides at heart yearn in process of production, transmission making troubles to signal.
Summary of the invention
Purpose of the present invention is exactly in order to overcome the deficiency of current material on market, a kind of high resistance compression railway digital signal cable physical foam insulation material and preparation method thereof to be provided.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of railway digital signal cable physical foam insulation material comprises following feed composition and weight percentage:
Polypropylene 50～80%;
Low Density Polyethylene 17～47%;
Nucleator 0.1～1%;
Oxidation inhibitor 0.1～1%;
Lubricant 0.1～1%;
Described polypropylene is a kind of of homo-polypropylene or Co-polypropylene, and its melting index is 3-20g/10min;
Its melting index of described Low Density Polyethylene is 0.1-10g/10min, density range 0.915-0.940g/cm
3
Above-mentioned polyacrylic melting index is under 230 ℃ of load 2.16kg conditions and detects, and the melting index of Low Density Polyethylene is under 190 ℃ of load 2.16kg conditions and detects.
Described nucleator is the azo nucleator, as Diisopropyl azodicarboxylate, Cellmic C 121 etc.;
Described oxidation inhibitor is antioxidant 1076 (β-(4-hydroxy phenyl-3, the positive octadecanol ester of propionic acid) and the compound of irgasfos 168 (three [2.4-di-tert-butyl-phenyl] phosphorous acid ester) the 5-di-t-butyl), better, the weight ratio of antioxidant 1076 and irgasfos 168 is 1: 1.
Described lubricant is fatty amide series lubricant agent such as ethylene bis stearamide (EBS) etc.;
The preparation method of railway digital signal cable physical foam insulation material of the present invention comprises the following steps:
(1) raw material is put into high-speed mixer according to proportioning, high speed 1500-3000rpm mixing 1-3 minute;
(2) low speed 500-1000rpm discharging;
(3) raw material that mixes is put into the dual-screw-stem machine extruding pelletization, the rotating speed of forcing machine is 180-600 rev/min, and temperature is 150-180 ℃, makes high resistance compression railway digital signal cable physical foam insulation material.
High resistance compression railway digital signal cable physical foam insulation material property of the present invention can be excellent, can be applicable to the physical blowing railway digital signal cable.
It is base-material that the present invention adopts polypropylene and Low Density Polyethylene, adds the auxiliary agents such as nucleator, oxidation inhibitor, lubricant, is specifically designed to the physical foaming material of railway digital signal cable by twin-screw extrusion production.
Polyacrylic hardness is substantially all greater than Shao Shi 70D, and the hardness of high density polyethylene(HDPE) only has Shao Shi 65D left and right, therefore adopts polypropylene, can effectively improve the hardness of material, increases the wide degree of abscess in foamed cable, improves the anti-compression properties of core wire.Yet simple polypropylene is because its molecule becomes linear, and foam performance is bad, can't reach the foam degrees more than 60%.When foam degrees was low, specific inductivity and the dielectric loss angle tangent of material were larger, and the diminution factor of cable is larger, i.e. the signal attenuation of transmission is more, therefore can't use separately polypropylene as foam material.Low Density Polyethylene because containing more long-chain branch in its molecular structure, can well foam, and when it uses separately, foam degrees can reach more than 80%.Therefore, polypropylene and Low Density Polyethylene are used in conjunction with, can obtain all materials preferably of hardness and foam degrees, can improve the anti-compression properties of cable, also do not reduce the signal transmission capabilities of cable.
Compared with prior art, utilize the prepared railway digital signal physical blowing cable of the present invention to have the characteristics such as stable processing technique, the heart yearn abscess is even, resistance to compression is good.
Embodiment
The invention will be further described below in conjunction with specific embodiment, and protection scope of the present invention includes but not limited to following embodiment.
Embodiment 1-4
The preparation method of railway digital signal cable physical foam insulation material, the method comprises the following steps:
(1) get the raw materials ready according to the listed component of embodiment in table 1 and content;
(2) above-mentioned raw materials is put into high-speed mixer, (1500～3000rpm) mixed approximately 1-3 minute at a high speed;
(3) low speed (500～1000rpm) dischargings;
(4) raw material that mixes is put into the dual-screw-stem machine extruding pelletization.The rotating speed of forcing machine is controlled at 180-600 rev/min, and temperature is in the scope of 150-180 ℃, to make railway digital signal cable physical foam insulation material.
The railway digital signal cable physical foam insulation material that comparative example and embodiment 1～embodiment 3 are made carries out performance test, and its result is as shown in table 2.
The formula table of table 1 embodiment 1-4 (unit: kilogram)
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| Polypropylene 1 | 50 | / | / | / |
| Polypropylene 2 | / | 80 | / | 80 |
| Polypropylene 3 | 70 | / | ||
| Low Density Polyethylene 1 | 47 | / | / | |
| Low Density Polyethylene 2 | / | 17 | / | 17 |
| Low Density Polyethylene 3 | 28 | / | ||
| Diisopropyl azodicarboxylate | 1 | / | / | / |
| Cellmic C 121 | / | 1 | 0.5 | 0.1 |
| Antioxidant 1076 | 0.5 | 0.5 | 0.5 | 0.05 |
| Irgasfos 168 | 0.5 | 0.5 | 0.5 | 0.05 |
| Lubricate EBS | 1 | 1 | 0.5 | 0.1 |
In table 1: polypropylene 1 is homo-polypropylene, and melting index is 3g/10min;
Polypropylene 2 is Co-polypropylene, and melting index is 20g/10min;
Polypropylene 3 is homo-polypropylene, and melting index is 10g/10min;
Low Density Polyethylene 1, melting index are 10g/10min, density: 0.920g/cm
3
Low Density Polyethylene 2, melting index are 0.1g/10min, density: 0.915g/cm
3
Low Density Polyethylene 3, melting index are 2g/10min, density: 0.940g/cm
3
The performance of table 2 high resistance compression railway digital signal cable physical foam insulation material
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| Melt flow rate (MFR) | 5 | 8 | 5.5 | 7.8 |
| (140℃×5kg) | ||||
| Density (g/cm 3) | 0.921 | 0.923 | 0.955 | 0.923 |
| Tensile strength (MPa) | 26 | 28 | 11 | 28 |
| Elongation at break (%) | 590 | 630 | 600 | 630 |
| 20 ℃ of volume specific resistances (Ω m) | 2×10 15 | 3×10 15 | 2×10 15 | 3×10 15 |
| Specific inductivity, 1MHz (test frequency) | 2.36 | 2.32 | 2.3 | 2.31 |
| Dielectric loss angle tangent, 1MHz (test frequency) | 0.001 | 0.001 | 0.001 | 0.001 |
| Hardness (Shao Shi D) | 68 | 73 | 71 | 73 |
In table 2, the testing method of each project is as follows:
The mensuration of melt flow rate (MFR) is carried out according to the regulation of the mensuration of GB3682-2000 thermoplastics melt mass flow rate and melt volume-flow rate.
The mensuration of density is according to the mensuration part 1 of the non-foam plastic density of GB1033.1-2008 plastics: the regulation of pickling process, liquid specific gravity bottle method and volumetry is carried out.
The mensuration of tensile strength is carried out according to GB/T 1040-1992 plastic tensile method for testing performance regulation, during test with the speed stretching sample of 25mm/min.
The mensuration of elongation at break is carried out according to GB/T 1040-1992 plastic tensile method for testing performance regulation, during test with the speed stretching sample of 25mm/min.
The mensuration of 20 ℃ of lower volume resistivity is carried out according to GB/T 1410-1989 solid insulating material volume specific resistance and surface resistivity test method regulation.
The mensuration of specific inductivity is carried out in the test method regulation of power frequency, audio frequency, the lower relative permittivity of high frequency (comprising metric wave length) and dielectric dissipation factor according to GB 1409-88 solid insulating material.
The mensuration of dielectric dissipation factor is carried out in the test method regulation of power frequency, audio frequency, the lower relative permittivity of high frequency (comprising metric wave length) and dielectric dissipation factor according to GB 1409-88 solid insulating material.
The mensuration of shore hardness is carried out according to GB 2411-1980 plastics shore hardness test method regulation.
Shielding group core wire test result such as the table 3 extruded on wheat Raphael's railway digital signal cable specific equipment TEL35E with embodiment 3 and import high density polyethylene(HDPE) foamed material:
The test result of table 3 railway digital signal cable shielding core assembly line
| Project | The import high density polyethylene(HDPE) | Embodiment 3 |
| Conductor diameter (mm) | 1.01 | 1.01 |
| Heart yearn external diameter (mm) | 2.73 | 2.72 |
| Tensile strength (MPa) | 8 | 9 |
| Elongation at break (%) | 600 | 619 |
| Anti-compression properties | 750N | 1050N |
In table 3, the testing method of each project is all according to TB/T 3100.1～5-2004 " railway digital signal cable ", with and revise and singly test.
This shows, the railway digital signal cable physical foam insulation material of the present invention's preparation has higher anti-compression properties.
Claims (6)
1. railway digital signal cable physical foam insulation material comprises following component and weight percentage:
Described nucleator is the azo nucleator, is selected from Diisopropyl azodicarboxylate and Cellmic C 121;
Described oxidation inhibitor is the compound of antioxidant 1076 and irgasfos 168;
Described lubricant is ethylene bis stearamide.
2. railway digital signal cable physical foam insulation material according to claim 1, is characterized in that, described polypropylene is homo-polypropylene or Co-polypropylene.
3. railway digital signal cable physical foam insulation material according to claim 2, is characterized in that, described polyacrylic melting index is 3-20g/10min; Described polyacrylic melting index is under 230 ℃ of load 2.16kg conditions and detects.
4. railway digital signal cable physical foam insulation material according to claim 1, is characterized in that, the melting index of described Low Density Polyethylene is 0.1-10g/10min; The melting index of described Low Density Polyethylene is under 190 ℃ of load 2.16kg conditions and detects.
5. the preparation method of the described railway digital signal cable of claim as arbitrary in claim 1-4 physical foam insulation material comprises the following steps:
(1) raw material is put into high-speed mixer according to proportioning, high speed 1500-3000rpm mixes;
(2) low speed 500-1000rpm discharging;
(3) raw material that mixes is put into the dual-screw-stem machine extruding pelletization, the rotating speed of forcing machine is 180-600 rev/min, and temperature is 150-180 ℃.
6. the described railway digital signal cable of claim as arbitrary in claim 1-4 physical foam insulation material is for the preparation of the purposes of physical blowing railway digital signal cable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010209553 CN102295801B (en) | 2010-06-24 | 2010-06-24 | Physical foam insulating material for high-compression-resistance railway digital signal cable and preparation as well as application thereof |
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| CN 201010209553 CN102295801B (en) | 2010-06-24 | 2010-06-24 | Physical foam insulating material for high-compression-resistance railway digital signal cable and preparation as well as application thereof |
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| CN102295801A CN102295801A (en) | 2011-12-28 |
| CN102295801B true CN102295801B (en) | 2013-06-05 |
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| CN103554665A (en) * | 2013-10-31 | 2014-02-05 | 合肥得润电子器件有限公司 | Weather-proof and wet-resistant polypropylene insulating material for wire harnesses of communication equipment |
| CN104761817A (en) * | 2015-04-21 | 2015-07-08 | 昆山金大化纤科技有限公司 | Foamed floating ball and production process thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1146607A (en) * | 1995-06-07 | 1997-04-02 | 三菱电线工业株式会社 | Isulation material for coaxial cable, coaxial cable and method for making same |
| CN1741199A (en) * | 2004-08-26 | 2006-03-01 | 深圳市联嘉祥电线电缆实业有限公司 | Method for producing physical foamed insulation material of coaxle cable |
| CN101655589A (en) * | 2009-05-21 | 2010-02-24 | 蒋菊生 | Cable-filling material and manufacture method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1146607A (en) * | 1995-06-07 | 1997-04-02 | 三菱电线工业株式会社 | Isulation material for coaxial cable, coaxial cable and method for making same |
| CN1741199A (en) * | 2004-08-26 | 2006-03-01 | 深圳市联嘉祥电线电缆实业有限公司 | Method for producing physical foamed insulation material of coaxle cable |
| CN101655589A (en) * | 2009-05-21 | 2010-02-24 | 蒋菊生 | Cable-filling material and manufacture method thereof |
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Address after: 201802 Shanghai City, Jiading District Nanxiang Town Yongle Village No. 271 Patentee after: Shanghai Kaibo cable special material Co., Ltd Address before: 201802 Shanghai City, Jiading District Nanxiang Town Yongle Village No. 271 Patentee before: SHANGHAI KAIBO SPECIAL CABLE FACTORY Co.,Ltd. |