CN104867628A - Preparation method for PEP foaming cable - Google Patents
Preparation method for PEP foaming cable Download PDFInfo
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- CN104867628A CN104867628A CN201510250275.5A CN201510250275A CN104867628A CN 104867628 A CN104867628 A CN 104867628A CN 201510250275 A CN201510250275 A CN 201510250275A CN 104867628 A CN104867628 A CN 104867628A
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Abstract
The invention discloses a preparation method for a PEP foaming cable, and the method is characterized in that the insulating layer of the cable comprises an internal layer and an outer layer; the material of the internal layer and the material of the external layer serve as extruding materials which form the insulating layer of the cable in a coextrusion manner; the internal layer is attached to the metal core of the cable; the material of the internal layer is ether modified PEP resin, wherein the MFR value of the ether modified PEP resin is (greater than) from 15 g/min to 30 g/min; the material of the external layer employs cable-level FEP cable aggregates as the main material; and the cable-level FEP cable aggregates form the external layer through the technology of nitrogen physical foaming extrusion or the technology of chemical foaming extrusion. The method can retain the excellent performances of a conventional PEP foaming cable, and also can greatly improve the extrusion sped of the cable.
Description
Technical field
The present invention relates to a kind of FEP foamed cable preparation method.
Background technology
Due to fire prevention to high buildings demand, communication cable adopts fluororesin to get up as the cable application of insulating barrier gradually more, because cable molding technique needs such cable insulation to adopt the schemes such as FEP, PFA, ETFE, ECTFE, PVDF, wherein FEP and PFA class cable due to heat resistance good, dielectric property are excellent, can at 200 DEG C normal use, therefore become the market mainstream.Relative PFA class cable FEP class cable is advantageously becoming the most important fluorine-containing cable in market in price.
Early stage FEP cable adopts the mode of solid insulation, finds afterwards to adopt the mode of foaming can not only save the consumption of raw materials of FEP in a large number, more significantly can improve the transmission speed of FEP communication cable.Communications optical cable cable 2010 (4), " research and development of fluoroplastic cable high-foaming insulation manufacturing process " literary composition is for 50 conventional Ω coaxial cables, the FEP cable of physical blowing 50% is compared with solid insulation FEP cable, be promoted to while 81% in transmission speed from 66%, more can save the FEP raw material of 66%.Therefore gradually become main flow based on the exploitation of this principle FEP foamed cable, day by day increase in the coaxial cable field application of more than wire diameter 0.3mm.Chinese patent application 201310096313.7 discloses Foamex formed body, the manufacture method of foam insulated wire and cable and Foamex formed body, adopt the mode of chemical blowing two kinds of fluororesin co-extrusions, because adopted chemical foaming agent is azo-compound, acyl acyl compound, nitroso compound, semicarbazide compound, hydrazono-compound etc., its boiling point is lower than FEP melting point resin temperature, and be strict with the fusing point of a kind of fluororesin as ETFE (ethylene-tetrafluoroethylene polymer) or EFEP (ethylene-tetrafluoroethylene-hexafluoropropylene polymer) lower than FEP fusing point 40 DEG C, restriction due to chemical foaming agent temperature constrains cable extruding temperature, finally have impact on cable extruding speed.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and provide a kind of while reservation traditional F EP foamed cable excellent properties, the FEP foamed cable preparation method of the extruded velocity of cable can be increased substantially.
The present invention's adopted technical scheme that solves the problem is:
A kind of FEP foamed cable preparation method, it is characterized in that: the insulating barrier of cable comprises inside and outside two-layer, using the raw material of internal layer and outer field raw material as extruding raw material and being formed the insulating barrier of cable in the mode of coextrusion, wherein, internal layer is close to cable metal core, the raw material of internal layer adopts ether modification FEP resin, the MFR value of described ether modification FEP resin is 15 ~ 30g/min, outer field raw material adopts cable-grade FEP cable granules to be major ingredient, and cable-grade FEP cable granules forms skin by nitrogen physisorption foaming heat expressing technique or by the hot-extrudable technique of chemical blowing.
As preferably, in described ether modification FEP resin material, the weight ratio of ether is 0.2 ~ 3%, the fusing point 270 ~ 300 DEG C of described ether modification FEP resin material, and the consumption of described ether modification FEP resin material is extrude raw material total weight 3 ~ 40%.
As preferably, the MFR value of described cable-grade FEP cable granules is 8.1 ~ 15g/10min, the fusing point of cable-grade FEP cable granules 265 ~ 270 DEG C.
As preferably, outer field raw material contains nucleator, and described nucleator adopts boron nitride, silicon nitride or silicon fluoride, and the consumption of nucleator is extrude raw material total weight 0.005 ~ 2%.
As preferably, the extrusion temperature of described nitrogen physisorption foaming heat expressing technique is 400 ~ 410 DEG C.
The chemical foaming agent of the hot-extrudable technique of described chemical blowing adopts fluoropolyether, and the consumption of fluoropolyether is extrude raw material total weight 0.05 ~ 10%.
As preferably, the extrusion temperature of the hot-extrudable technique of chemical blowing is 390 ~ 400 DEG C.
As preferably, described fluoropolyether is the compound with lower unit: R1O (CF2CF (CF3) O) nR2, n is 8 ~ 25, R1 is the perfluor alkyl of carbon number 1 ~ 3 or the alkyl functional group of 1 ~ 3, R2 is hydrogen or fluorine element, and fluoropolyether consumption is extrude raw material total weight 1 ~ 3%.
The present invention compared with prior art, have the following advantages and effect: the results showed FEP foamed cable preparation method, by ether modification FEP resin and cable-grade FEP cable granules to be formed the insulating barrier of cable in the mode of coextrusion, while reservation traditional F EP foamed cable excellent properties, can the extruded velocity of raising cable by a relatively large margin.
Accompanying drawing explanation
Fig. 1 is in the embodiment of the present invention, when cable-grade FEP cable granules forms skin by nitrogen physisorption foaming heat expressing technique, and the technical process schematic diagram of FEP foamed cable preparation method.
Fig. 2 is the embodiment of the present invention, when cable-grade FEP cable granules forms skin by the hot-extrudable technique of chemical blowing, and the technical process schematic diagram of FEP foamed cable preparation method.
Fig. 3 is the cross-sectional view of embodiment of the present invention foamed cable.
Embodiment
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Form by from the skin 1, internal layer 2 and the copper core 3 that set gradually within outer see Fig. 3, FEP foamed cable.FEP foamed cable preparation method, as described below: using the raw material of internal layer 2 and outer 1 raw material as extruding raw material and being formed the insulating barrier of cable in the mode of coextrusion, wherein, internal layer 2 is close to cable metal core, the raw material of internal layer 2 adopts ether modification FEP resin, the MFR value of described ether modification FEP resin is 15 ~ 30g/min, in described ether modification FEP resin material, the weight ratio of ether is 0.2 ~ 3%, the fusing point 270 ~ 300 DEG C of described ether modification FEP resin material, the consumption of described ether modification FEP resin material is extrude raw material total weight 3 ~ 40%.
The raw material of outer 1 adopts cable-grade FEP cable granules to be major ingredient.The MFR value of described cable-grade FEP cable granules is 8.1 ~ 15g/10min, the fusing point of cable-grade FEP cable granules 265 ~ 270 DEG C.Outer field raw material contains nucleator, and described nucleator adopts boron nitride, silicon nitride or silicon fluoride, and the consumption of nucleator is extrude raw material total weight 0.005 ~ 2%.
Wherein, as shown in Figure 1, cable-grade FEP cable granules is by nitrogen physisorption foaming heat expressing technique, and the extrusion temperature of described nitrogen physisorption foaming heat expressing technique is 400 ~ 410 DEG C.
As shown in Figure 2, cable-grade FEP cable granules also forms skin by the hot-extrudable technique of chemical blowing.The chemical foaming agent of the hot-extrudable technique of described chemical blowing adopts fluoropolyether, described fluoropolyether is the compound with lower unit: R1O (CF2CF (CF3) O) nR2, n is 8 ~ 25, R1 is the perfluor alkyl of carbon number 1 ~ 3 or the alkyl functional group of 1 ~ 3, R2 is hydrogen or fluorine element, and fluoropolyether consumption is extrude raw material total weight 1 ~ 3%.The extrusion temperature of the hot-extrudable technique of chemical blowing is 390 ~ 400 DEG C.
Be prepared as example, copper core 0.93mm with 50 conventional Ω coaxial cables, according to above-mentioned FEP foamed cable preparation method, get different preparation parameters, carry out the preparation of 50 Ω coaxial cables, and the data of statistical experiment 1-9, obtain following table:
By upper Biao Ke get: the present invention, can the extruded velocity of raising cable by a relatively large margin while reservation traditional F EP foamed cable excellent properties.
Above content described in this specification is only made for the present invention illustrating.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from the content of specification of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (8)
1. a FEP foamed cable preparation method, it is characterized in that: the insulating barrier of cable comprises inside and outside two-layer, using the raw material of internal layer and outer field raw material as extruding raw material and being formed the insulating barrier of cable in the mode of coextrusion, wherein, internal layer is close to cable metal core, the raw material of internal layer adopts ether modification FEP resin, the MFR value of described ether modification FEP resin is 15 ~ 30g/min, outer field raw material adopts cable-grade FEP cable granules to be major ingredient, cable-grade FEP cable granules forms skin by nitrogen physisorption foaming heat expressing technique or by the hot-extrudable technique of chemical blowing.
2. FEP foamed cable preparation method described in claim 1, it is characterized in that: in described ether modification FEP resin material, the weight ratio of ether is 0.2 ~ 3%, the fusing point 270 ~ 300 DEG C of described ether modification FEP resin material, the consumption of described ether modification FEP resin material is extrude raw material total weight 3 ~ 40%.
3. FEP foamed cable preparation method described in claim 1, is characterized in that: the MFR value of described cable-grade FEP cable granules is 8.1 ~ 15g/10min, the fusing point of cable-grade FEP cable granules 265 ~ 270 DEG C.
4. FEP foamed cable preparation method described in claim 1, is characterized in that: outer field raw material contains nucleator, and described nucleator adopts boron nitride, silicon nitride or silicon fluoride, and the consumption of nucleator is extrude raw material total weight 0.005 ~ 2%.
5. FEP foamed cable preparation method described in claim 1, is characterized in that: the extrusion temperature of described nitrogen physisorption foaming heat expressing technique is 400 ~ 410 DEG C.
6. FEP foamed cable preparation method described in claim 1, is characterized in that: the chemical foaming agent of the hot-extrudable technique of described chemical blowing adopts fluoropolyether, and the consumption of fluoropolyether is extrude raw material total weight 0.05 ~ 10%.
7. FEP foamed cable preparation method described in claim 6, is characterized in that: the extrusion temperature of the hot-extrudable technique of chemical blowing is 390 ~ 400 DEG C.
8. FEP foamed cable preparation method described in claim 6, it is characterized in that: described fluoropolyether is the compound with lower unit: R1O (CF2CF (CF3) O) nR2, n is 8 ~ 25, R1 is the perfluor alkyl of carbon number 1 ~ 3 or the alkyl functional group of 1 ~ 3, R2 is hydrogen or fluorine element, is fluoropolyether consumption for extruding raw material (cable-grade FEP cable granules?) total weight 1 ~ 3%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105440361A (en) * | 2015-12-25 | 2016-03-30 | 赣州金信诺电缆技术有限公司 | Foamed sheath for foamed FEP (fluorinated ethylene propylene) cables and preparation method thereof |
| CN109659093A (en) * | 2018-11-23 | 2019-04-19 | 东莞庆龙电线电缆有限公司 | A kind of low direct capacitance core wire manufacturing process for HDMI data line |
| CN117567826A (en) * | 2023-12-20 | 2024-02-20 | 广州敬信高聚物科技有限公司 | Chemical foaming FEP cable material and preparation method thereof |
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| CN1767081A (en) * | 2004-10-29 | 2006-05-03 | 国光电子线股份有限公司 | Multi-layer insulated electrical wire |
| CN100354325C (en) * | 2002-01-17 | 2007-12-12 | 大金工业株式会社 | FEP pellet |
| CN101100099A (en) * | 2007-07-26 | 2008-01-09 | 王根顺 | Method for manufacturing coaxial cable insulated layer and foam material and material processing technology |
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| CN201868552U (en) * | 2010-12-01 | 2011-06-15 | 天津安讯达科技有限公司 | Physical foaming FEP (fluorinated ethylene propylene) insulating radio-frequency cable |
| CN103554326A (en) * | 2008-02-15 | 2014-02-05 | 大金美国股份有限公司 | Tetrafluoroethylene/hexafluoropropylene copolymer and the production method thereof, and electrical wire |
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2015
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| CN100354325C (en) * | 2002-01-17 | 2007-12-12 | 大金工业株式会社 | FEP pellet |
| CN1767081A (en) * | 2004-10-29 | 2006-05-03 | 国光电子线股份有限公司 | Multi-layer insulated electrical wire |
| CN101563407A (en) * | 2006-12-21 | 2009-10-21 | 纳幕尔杜邦公司 | Foamed fluoropolymer article |
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| CN103554326A (en) * | 2008-02-15 | 2014-02-05 | 大金美国股份有限公司 | Tetrafluoroethylene/hexafluoropropylene copolymer and the production method thereof, and electrical wire |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105440361A (en) * | 2015-12-25 | 2016-03-30 | 赣州金信诺电缆技术有限公司 | Foamed sheath for foamed FEP (fluorinated ethylene propylene) cables and preparation method thereof |
| CN109659093A (en) * | 2018-11-23 | 2019-04-19 | 东莞庆龙电线电缆有限公司 | A kind of low direct capacitance core wire manufacturing process for HDMI data line |
| CN117567826A (en) * | 2023-12-20 | 2024-02-20 | 广州敬信高聚物科技有限公司 | Chemical foaming FEP cable material and preparation method thereof |
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