CN1098761C - Preparation of foamed insulating polyethylene material for coaxial cable - Google Patents
Preparation of foamed insulating polyethylene material for coaxial cable Download PDFInfo
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- CN1098761C CN1098761C CN98111927A CN98111927A CN1098761C CN 1098761 C CN1098761 C CN 1098761C CN 98111927 A CN98111927 A CN 98111927A CN 98111927 A CN98111927 A CN 98111927A CN 1098761 C CN1098761 C CN 1098761C
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- nucleator
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Abstract
The present invention discloses a method for preparing insulating polyethylene foam materials of coaxial cables, which belongs to the field of plastic processing and application. The insulating polyethylene foam materials are prepared from raw materials of HDPE with melt indexes of 3 to 9 g/10 min, LDPE with melt indexes of 0.2 to 2 g/10 min and a nucleating agent by that the raw materials are mixed, melted, extruded and pelletized. The method has the advantages of simple, easy operation, wide source of raw materials and good product quality, especially coaxial cables prepared from the insulating polyethylene foam materials has excellent performance of natural impedance, return loss, insulating resistance, attenuation, etc. The insulating polyethylene foam materials can completely replace the imported physical forming insulating materials of coaxial cables and has conspicuous economic benefit, and per ton of insulating polyethylene foam materials can save capital of 2000 RMB.
Description
The present invention relates to plastic processing technology, belong to the used preparation of foamed insulating polyethylene material of coaxial cable physical blowing.
In the prior art, coaxial cable cellular insulation material manufacture method has two kinds: a kind of is by the direct synthetic foam Insulation Material of resin production plant, another kind is to form with high density polyethylene (HDPE) (HDPE) resin and the direct blending of low density polyethylene (LDPE) (LDPE) resin, and the coaxial cable producer is blending nucleator (CBA) more in use.Preceding a kind of method, because equipment investment is huge, the synthetic technology complexity, the product market price costliness, the CABLE MATERIALS production supplier of countries in the world seldom adopts.A kind of method in back is that the cable production supplier of countries in the world generally adopts, as U.S. Quantum Chemical Corp, the said firm is the main supplier of coaxial cable insulation cable material, the coaxial cable cellular insulation material that the provides preparation that comes to this.Promptly use HDPE (LS6081-00) resin and LDPE (NA951-000) resin to make in the direct blend of 1: 3～3: 1 ratio.And for example the Japan Patent spy opens the cellular insulation preparation method for material that tire 58-223210 discloses, and also belongs to this method.The concrete preparation method of this patent is, is that 80～97% HDPE resin and percentage by weight are 3～20% the direct blend of LDPE resin with percentage by weight, promptly makes Insulation Material.Wherein the density of HDPE (ρ) is 0.940～0.96g/cm
3, melt index (MI) (Mi) is 0.3～2g/10min; The density of LDPE (ρ) is 0.921～0.934g/cm
3, melt index (MI) (Mi) is less than 1.0g/10min.
Although a kind of method in back generally adopts for countries in the world cable insulating material production supplier, but still exist the place of some shortcomings.One prepares cable insulating material with HDPE resin and the direct according to a certain percentage blend of LDPE resin, and its mixing belongs to the solid mechanical mixture, and two kinds of mixed with resin are inhomogeneous.With mixing the cable insulation that uneven Insulation Material foaming is extruded, its surface smoothness and fineness are all relatively poor, and the cable footpath is wayward, and mutual capacitance is also unstable.It two is not contain nucleator in the Insulation Material, and nucleator is mixed voluntarily in proportion by the cable producer, uses inconvenient.Because it is not the foaming effect of the addition direct relation cable fluid insulation of nucleator is a key factor that influences cable quality, punctual again when the nucleator ratio that cables manufacturing person mixes voluntarily, will influence the foam quality of coaxial cable.Severe patient can make the foamed cable report from a liner of extruding useless, causes very big economic loss.
The method that the purpose of this invention is to provide a kind of simple and easy to do manufacturing coaxial cable polyethylene foam insulation material that HDPE, LDPE and CBA are combined together, process the coaxial cable of extruding with the Insulation Material that the present invention produces, its polyethylene foam insulation layer, surfacing is bright and clean, the control easily of line footpath, good electrical property, and the user uses very convenient.
Coaxial cable cellular insulation material performance requirement is higher, not only require to have good processing properties, so that when extrusion foaming, be easy to control line footpath, mutual capacitance and foam degrees, also good electrical properties will be arranged, the cable of promptly making will have good characteristic impedance, return loss, insulaion resistance, attenuation constant etc.Except that above-mentioned requirements, good mechanical performance and nucleation performance to be arranged also.Any at present resin all can not satisfy these requirements all sidedly.Blending and modifying is the effective ways that satisfy the above-mentioned performance of cellular insulation material.The inventor is based upon to carry out technical conceive on such basis, improves blend method to realize the above-mentioned purpose of invention.
As follows in order to realize technical scheme of the present invention:
It with percentage by weight 70% high density polyethylene (HDPE) (HDPE) resin, 29.85% low density polyethylene (LDPE) (LDPE) resin and 0.05% nucleator are raw material, blending under solid state earlier, fully mixing under molten condition then, the back extruding pelletization makes it to combine together, make the cellular insulation material, the operating temperature of melting mixing extrusion is controlled at and is not higher than 180 ℃, and in the melting mixing process, add the antioxidant of raw material total amount 0.1% (weight), wherein the nucleator as one of raw material components is the nucleator that contains the activator composition.The kind of nucleator is a lot, as Celogen Az; Azoformic acid barium; N, N '-subunit five methine tetramines etc.Antioxidant can be four [3-(3 ', 5 ')-di-t-butyl-4 '-hydroxy phenyl] propionic acid pentaerythritol ester; 1,1,3-three (2-methyl-4-hydroxyl-5-tert-butyl-phenyl) butane; 2,2 '-dihydroxy-3,3 '-two (Alpha-Methyl cyclohexyl)-5,5 '-dimethyl diphenylmethane; 4,4 '-methylene bis (2, the 6-DI-tert-butylphenol compounds) etc.Activator can be a metal oxide, as zinc oxide, aluminium oxide etc.; Also can be stearate, as cadmium stearate, zinc stearate, barium stearate etc.; Can also be nonmetallic compound, as glycerine, diethylene glycol etc.High density polyethylene (HDPE) (HDPE) as raw material can select density at 0.940～0.960g/cm
3, melt index (MI) is between 3～9g/10min; Low density polyethylene (LDPE) (LDPE) can select density at 0.910～0.925g/cm
3, melt index (MI) is 0.2～2.5g/10min; It is 190～210 ℃ that nucleator (CBA) can be selected decomposition temperature, and fineness is not less than 200 purposes.Preferably selecting melt index (MI) is the HDPE of 6～8g/10min, and melt index (MI) is the LDPE of 1.5～2g/10min, and decomposition temperature is 195～205 ℃ CBA.
Compared with the prior art the present invention has following relatively more outstanding advantage:
1. the present invention is with the blend under solid state earlier of raw material HDPE resin, LDPE resin and nucleator, and then it is fully mixing under molten condition, they are combined together, extruding pelletization prepares Insulation Material, with the Insulation Material of HDPE resin and the direct blend preparation of LDPE resin, the mixing of blend is very even compared to prior art.The coaxial cable insulated layer of manufacturing is extruded in Insulation Material foaming with the present invention's preparation, and its surfacing is bright and clean, and the insulating barrier presentation quality is very good.
2. the Insulation Material of prior art for preparing does not contain nucleator, and nucleator, is blended in the Insulation Material when producing cable by the Insulation Material user, disperses inhomogeneous.And the Insulation Material of the present invention's preparation has contained nucleator, and nucleator is by the solid blend, and melting mixing very is evenly dispersed in the resin.Insulating barrier is made in Insulation Material foaming with the present invention preparation, can obtain abscess densification, high-quality foaming body that all even foam degrees is high.Simultaneously also can avoid adding nucleator more in addition, and because the user adds the inaccurate quality accident that causes of ratio of nucleator voluntarily, and the user uses more convenient, quality is also more secure by the user.
3. the nucleator that uses of the present invention, it is the nucleator that contains the activator composition, the decomposition temperature of nucleator is low, therefore, when making coaxial cable insulated layer with the Insulation Material of the present invention's preparation, nucleator decomposes more abundant more fully, and decompose residues is almost 0, eliminated the corrosion of residue, improved the cable transmission effect the cable copper cash.
The present invention also has more otherwise advantages.
Of the present invention open, for people provide a kind of technology simple, realize easily, raw material sources are extensive, and production cost is low, the cable cellular insulation material production technology that economic benefit is considerable, and the cellular insulation material of preparation has contained finely dispersed nucleator, uses very convenient.Its performance can satisfy the coaxial cable physical blowing to the requirement of polyethylene foam insulation material all properties.With the direct blend Insulation Material of the Insulation Material substituting import one of the present invention preparation, per tonly economize on the use of funds 2000 yuan.
1 embodiment of the present invention is disclosed below:
Embodiment:
Density is 0.954g/cm
3, melt index (MI) is 6.5g/10min, consumption is the HDPE resin of 70% (weight); Density is 0.918g/cm
3Melt index (MI) is 1.8g/10min, consumption is that the LDPE resin and the molecular weight of 29.85% (weight) is 116, fineness is by 200 orders, gas forming amount is 285ml/g, decomposition temperature is 195 ℃, consumption is 0.05% (weight), and the Celogen Az nucleator that contains the zinc oxide activator earlier directly carries out blending, add again total amount 0.1% (weight) four (3-(3,5 ')-and di-t-butyl-4 '-hydroxy phenyl) propionic acid pentaerythritol ester antioxidant, be heated to 175 ℃, and then move into double screw extruder, fully mixing under molten condition, make its back extruding pelletization that combines together, promptly obtain coaxial cable physical blowing HDPE (high density polyethylene) cellular insulation material.Its performance such as subordinate list 1.
Table 1 polyethylene foam insulation material of the present invention performance
| Sequence number | Project name | Unit | Embodiment 1 |
| 1 | Melt flow rate (MFR) | g/10min | 4.8 |
| 2 | Density | g/cm 3 | 0.951 |
| 3 | Black brittleness-76 ℃ | Failure number | 0/10 |
| 4 | The anti-yield strength of stretching | Mpa | 20.5 |
| 5 | Elongation at break | ％ | 528 |
| 6 | Oxidation induction period | min | 55 |
| 7 | Dielectric constant 1MH2 | 2.30 | |
| 8 | Dielectric dissipation factor 1MHZ | 2.1×10 -4 | |
| 9 | Specific insulation | Ω.m | 4.5×10 13 |
| 10 | Frothing percentage | ％ | 50 |
| 11 | Expanded beads number | Grain/50g | 0 |
Claims (3)
1. preparation of foamed insulating polyethylene material for coaxial cable, it is characterized in that high density polyethylene (HDPE) with 70% (weight), the nucleator that the low density polyethylene (LDPE) of 29.85% (weight) and 0.05% (weight) contains the activator composition is a raw material, blending under solid state earlier, abundant mixing combining together under molten condition then, extruding pelletization, the melting mixing extrusion temperature is not higher than 180 ℃, and adds the antioxidant of raw material total amount 0.1% (weight) in melt extruding process.
2. preparation of foamed insulating polyethylene material for coaxial cable according to claim 1, the density that it is characterized in that said high density polyethylene (HDPE) is 0.940～0.960g/cm
3, melt index (MI) is 3～9g/10min; The density of low density polyethylene (LDPE) is 0.910～0.925g/cm
3, melt index (MI) is 0.2～2.5g/10min; The decomposition temperature of nucleator is 190～210 ℃, and fineness is not less than 200 orders.
3. preparation of foamed insulating polyethylene material for coaxial cable according to claim 1 and 2, the melt index (MI) that it is characterized in that high density polyethylene (HDPE) is 6～8g/10min, the melt index (MI) of low density polyethylene (LDPE) is 1.5～2g/10min, and the nucleator decomposition temperature is 195～205 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98111927A CN1098761C (en) | 1998-03-31 | 1998-03-31 | Preparation of foamed insulating polyethylene material for coaxial cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98111927A CN1098761C (en) | 1998-03-31 | 1998-03-31 | Preparation of foamed insulating polyethylene material for coaxial cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1230481A CN1230481A (en) | 1999-10-06 |
| CN1098761C true CN1098761C (en) | 2003-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN98111927A Expired - Fee Related CN1098761C (en) | 1998-03-31 | 1998-03-31 | Preparation of foamed insulating polyethylene material for coaxial cable |
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| CN100354987C (en) * | 2005-08-30 | 2007-12-12 | 上海乐庭电子线缆有限公司 | Method for fabricating fire resistant communication cable, and products |
| CN101633757B (en) * | 2009-08-27 | 2013-05-01 | 杭州临安光大线缆有限公司 | Method for preparing coaxial cable core wire foaming insulation layer composition |
| CN102627794A (en) * | 2012-03-28 | 2012-08-08 | 天津市普立泰高分子科技有限公司 | Physical foaming polyethylene insulating material and preparation method thereof |
| CN103035330B (en) * | 2012-12-13 | 2015-08-26 | 苏州亨利通信材料有限公司 | Be applied to foaming packing gasket and the preparation technology thereof of optical cable |
| CN103030860B (en) * | 2012-12-13 | 2015-04-29 | 苏州亨利通信材料有限公司 | Foaming filler yarn granule for optical cable and preparation process thereof |
| CN104693581A (en) * | 2012-12-13 | 2015-06-10 | 苏州亨利通信材料有限公司 | Granular filling rope material for anti-deformation cable |
| CN104698555B (en) * | 2012-12-13 | 2019-02-05 | 苏州亨利通信材料有限公司 | The manufacturing process of optical cable low bulk filler material |
| CN103035331B (en) * | 2012-12-13 | 2015-08-26 | 苏州亨利通信材料有限公司 | Water vapor gasket for packing and manufacturing process thereof |
| CN104166198B (en) * | 2012-12-13 | 2018-06-12 | 苏州亨利通信材料有限公司 | The manufacturing process of high intensity foaming packing gasket |
| CN103113653B (en) * | 2013-02-06 | 2015-05-13 | 常州大学 | HDPE (high-density polyethylene)/LDPE (low-density polyethylene) blended foam material and preparation method thereof |
| CN105551585B (en) * | 2015-12-16 | 2018-01-09 | 江苏亨通线缆科技有限公司 | High-intensity high combustion locomotive cable |
| CN105469867B (en) * | 2015-12-16 | 2018-04-13 | 江苏亨通线缆科技有限公司 | Wear-resistant special cable used for rolling stock |
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| CN1035328A (en) * | 1988-12-23 | 1989-09-06 | 杨景德 | The production method of high-strength polyethylene netting twine |
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| CN1122274A (en) * | 1995-01-17 | 1996-05-15 | 中国石化齐鲁石油化工公司 | Special material for polyethylene fuel tank 2 of automobile and preparation method thereof |
| CN1124258A (en) * | 1994-12-09 | 1996-06-12 | 天水电缆材料厂 | Black polyvinyl cable material and producing technology |
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1998
- 1998-03-31 CN CN98111927A patent/CN1098761C/en not_active Expired - Fee Related
Patent Citations (5)
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|---|---|---|---|---|
| CN1035328A (en) * | 1988-12-23 | 1989-09-06 | 杨景德 | The production method of high-strength polyethylene netting twine |
| CN1075489A (en) * | 1992-02-18 | 1993-08-25 | 齐鲁石油化工公司研究院 | Special material for polyethylene fuel tank of automobile and preparation method thereof |
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| CN1230481A (en) | 1999-10-06 |
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