CN102013291B - Heat-shrinkable clad pipe - Google Patents
Heat-shrinkable clad pipe Download PDFInfo
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- CN102013291B CN102013291B CN2010102842434A CN201010284243A CN102013291B CN 102013291 B CN102013291 B CN 102013291B CN 2010102842434 A CN2010102842434 A CN 2010102842434A CN 201010284243 A CN201010284243 A CN 201010284243A CN 102013291 B CN102013291 B CN 102013291B
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- pyrocondensation
- insulating barrier
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- conductive layer
- insulating layer
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Abstract
A heat-shrinkable composite pipe comprises: a heat-shrinkable semi-conducting layer and an insulating layer which cling to each other. The insulating layer is arranged at the inner side, and the heat-shrinkable semi-conducting layer is arranged outside the insulating layer. The insulating layer made from elastic material can shrink depending on the self-elasticity. The insulating layer is mixed by one or more of the elastic materials: ethylene propylene diene monomer, silicon rubber and ethylene-vinyl acetate compolymer, wherein the mooney viscosity (1+4) of the ethylene propylene diene monomer at 125 DEG C is 30-50, the vinyl acetate content of the ethylene-vinyl acetate compolymer is more than 30%, and the Shore hardness of the insulating layer is not more than A/15:50. The inventive heat-shrinkable composite pipe can reduce the interface clearance between the insulating layer and the heat-shrinkable inner insulating pipe, and reduce partial discharge.
Description
Technical field
The present invention relates to a kind of multiple tube, relate in particular to the pyrocondensation multiple tube that a kind of internal layer has favorable elasticity.
Background technology
Present 35kV pyrocondensation electric cable fitting straight coupling, its structure all comprises insulated tube in pyrocondensation multiple tube and the pyrocondensation, and insulated tube is in the inboard in the pyrocondensation, and the pyrocondensation multiple tube is coated on the outside of insulated tube in the pyrocondensation.The pyrocondensation multiple tube is a double-layer structure, and outer is the pyrocondensation semi-conductive layer, and internal layer is an insulating barrier; Because the elasticity of insulating barrier is very poor; When its be in the inboard pyrocondensation after the insulated tube pyrocondensation together, exist interfacial gap between the insulated tube in insulating barrier and the pyrocondensation, cause 35kV pyrocondensation electric cable fitting straight coupling partial discharge excessive; Reach more than the 100pc, can not satisfy the partial discharge requirement of 35kV pyrocondensation electric cable fitting straight coupling.
Summary of the invention
The technical problem that the present invention will solve is: overcome in insulating barrier and the inboard pyrocondensation of existing pyrocondensation multiple tube and occur causing partial discharge excessive than the large interface gap between the insulated tube; Influence the problem of product quality, a kind of pyrocondensation multiple tube that reduces interfacial gap reduction partial discharge between insulating barrier and the interior insulated tube of pyrocondensation is provided.
In order to solve the problems of the technologies described above; The present invention proposes following technical scheme: a kind of pyrocondensation multiple tube; It comprises a pyrocondensation semi-conductive layer and an insulating barrier that is close together; This insulating barrier is positioned at the inboard, and this pyrocondensation semi-conductive layer is positioned at the outside of this insulating barrier, and this insulating barrier is to be processed and can be relied on himself elastic shrinkage by elastomeric material; This insulating barrier is made up of one or more mixing in the following elastomeric material: ethylene propylene diene rubber, silicon rubber, ethylene-vinyl acetate copolymer; The Mooney viscosity of ethylene propylene diene rubber (1+4) is 30-50 for 125 ℃, and the vinyl acetate content of ethylene-vinyl acetate copolymer is more than 30%, and the shore hardness of this insulating barrier is not more than A/15:50.
Preferably, this pyrocondensation semi-conductive layer forms an integral body with this insulating barrier through compound extruding, and finalizes the design and prepares the pyrocondensation multiple tube through crosslinking with radiation, expansion again.
Preferably, this insulating barrier is formed a circle by this pyrocondensation semi-conductive layer support.
The present invention has following beneficial effect: pyrocondensation multiple tube of the present invention, to form by pyrocondensation semi-conductive layer and insulating barrier, and insulating barrier is in the inboard; The pyrocondensation semi-conductive layer is in the outside of insulating barrier; This insulating barrier is processed by elastomeric material, receives the restriction of pyrocondensation semi-conductive layer, though tendencies toward shrinkage is arranged; But under the support of pyrocondensation semi-conductive layer, it can not shrink; After the pyrocondensation semi-conductive layer received thermal contraction, the restriction that insulating barrier receives the pyrocondensation semi-conductive layer was disengaged, and it is with regard to relying on himself elasticity and shrink.Because the insulating barrier hardness of this pyrocondensation multiple tube is very low; Has excellent elasticity; Can eliminate the interfacial gap between the insulated tube in pyrocondensation multiple tube and the pyrocondensation; Can reduce the partial discharge of 35kV pyrocondensation electric cable fitting straight coupling, it is reached below the 10pc, satisfy the requirement of 35kV pyrocondensation electric cable fitting straight coupling partial discharge.
Description of drawings
Fig. 1 is the cross-sectional view of pyrocondensation multiple tube of the present invention.
Embodiment
As shown in Figure 1, the present invention proposes a kind of pyrocondensation multiple tube, and it comprises a pyrocondensation semi-conductive layer 1 and an insulating barrier 2 that is close together.This insulating barrier 2 is positioned at the inboard, and this pyrocondensation semi-conductive layer 1 is positioned at the outside of this insulating barrier 2.
The material of this pyrocondensation semi-conductive layer 1 consists of: low density polyethylene (LDPE), ethylene-vinyl acetate copolymer (EVA) and superconduct carbon black.
The melt index of this low density polyethylene (LDPE) is 5.0g/10min.
Vinyl acetate (VA) content of this ethylene-vinyl acetate copolymer (EVA) be 18% and melt index be 5g/10min.
This pyrocondensation semi-conductive layer 1 has excellent conductive performance, and resistivity is 1*10
2Ω cm.
The shore hardness of this pyrocondensation semi-conductive layer 1 is A/15:92, and has the thermal contraction function.
The material of this insulating barrier 2 is formed: 125 ℃ of Mooney viscosities (1+4) are 35 ethylene propylene diene rubber, and its weight ratio is 70%, and vinyl acetate content is 35% ethylene-vinyl acetate copolymer, and its weight ratio is 30%.
This insulating barrier 2 can rely on himself elastic shrinkage.
The shore hardness of this insulating barrier 2 is not more than A/15:50.
Form an integral body through compound extruding between this pyrocondensation semi-conductive layer 1 and this insulating barrier 2, finalize the design and prepare the pyrocondensation multiple tube through crosslinking with radiation, expansion again.This pyrocondensation semi-conductive layer 1 is close together with this insulating barrier 2.
Because pyrocondensation semi-conductive layer 1 hardness is bigger, so this insulating barrier 2 is formed a circle by this pyrocondensation semi-conductive layer 1 support.
The 35kV pyrocondensation electric cable fitting straight coupling that uses this pyrocondensation multiple tube to make, partial discharge is very little, has only 6pc.
Pyrocondensation multiple tube of the present invention is made up of pyrocondensation semi-conductive layer 1 and insulating barrier 2, and insulating barrier 2 is in the inboard; Pyrocondensation semi-conductive layer 1 is in the outside of insulating barrier 2; This insulating barrier 2 is processed by elastomeric material, receives the restriction of pyrocondensation semi-conductive layer 1, though tendencies toward shrinkage is arranged; But under the support of pyrocondensation semi-conductive layer 1, it can not shrink; After pyrocondensation semi-conductive layer 1 received thermal contraction, the restriction that insulating barrier 2 receives pyrocondensation semi-conductive layer 1 was disengaged, and it is with regard to relying on himself elasticity and shrink.Because insulating barrier 2 hardness of this pyrocondensation multiple tube are very low; Has excellent elasticity; Can eliminate the interfacial gap between the insulated tube in pyrocondensation multiple tube and the pyrocondensation (figure does not show); Can reduce the partial discharge of 35kV pyrocondensation electric cable fitting straight coupling, it is reached below the 10pc, satisfy the requirement of 35kV pyrocondensation electric cable fitting straight coupling partial discharge.
Claims (3)
1. pyrocondensation multiple tube; It comprises a pyrocondensation semi-conductive layer and an insulating barrier that is close together; This insulating barrier is positioned at the inboard, and this pyrocondensation semi-conductive layer is positioned at the outside of this insulating barrier, it is characterized in that: this insulating barrier is to be processed and can be relied on himself elastic shrinkage by elastomeric material; This insulating barrier is made up of one or more mixing in the following elastomeric material: ethylene propylene diene rubber, silicon rubber, ethylene-vinyl acetate copolymer; The Mooney viscosity of ethylene propylene diene rubber (1+4) is 30-50 for 125 ℃, and the vinyl acetate content of ethylene-vinyl acetate copolymer is more than 30%, and the shore hardness of this insulating barrier is not more than A/15:50.
2. pyrocondensation multiple tube according to claim 1 is characterized in that: this pyrocondensation semi-conductive layer forms an integral body with this insulating barrier through compound extruding, and finalizes the design and prepares the pyrocondensation multiple tube through crosslinking with radiation, expansion again.
3. pyrocondensation multiple tube according to claim 1 and 2 is characterized in that: this insulating barrier is formed a circle by this pyrocondensation semi-conductive layer support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102842434A CN102013291B (en) | 2010-09-16 | 2010-09-16 | Heat-shrinkable clad pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102842434A CN102013291B (en) | 2010-09-16 | 2010-09-16 | Heat-shrinkable clad pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102013291A CN102013291A (en) | 2011-04-13 |
| CN102013291B true CN102013291B (en) | 2012-04-04 |
Family
ID=43843423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102842434A Active CN102013291B (en) | 2010-09-16 | 2010-09-16 | Heat-shrinkable clad pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102013291B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102760542A (en) * | 2012-07-12 | 2012-10-31 | 长园集团股份有限公司 | Three-layer thermal shrinkage composite tube |
| CN110092967A (en) * | 2019-04-26 | 2019-08-06 | 江苏达胜热缩防护用品有限公司 | A kind of preparation method of double layer continuous conduction insulated compound heat-shrink tube |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055841A (en) * | 1989-12-29 | 1991-10-30 | 明尼苏达州采矿制造公司 | Be used to seal the radially contractibility sleeve pipe of cable joint or cable socket |
| CN101330200A (en) * | 2007-09-21 | 2008-12-24 | 深圳市长园新材料股份有限公司 | Thermal shrinkage type composite casing tube for cable midst joint and manufacturing method thereof |
-
2010
- 2010-09-16 CN CN2010102842434A patent/CN102013291B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055841A (en) * | 1989-12-29 | 1991-10-30 | 明尼苏达州采矿制造公司 | Be used to seal the radially contractibility sleeve pipe of cable joint or cable socket |
| CN101330200A (en) * | 2007-09-21 | 2008-12-24 | 深圳市长园新材料股份有限公司 | Thermal shrinkage type composite casing tube for cable midst joint and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102013291A (en) | 2011-04-13 |
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180403 Address after: Nanshan District high tech Zone Guangdong streets Keyuan Road Changyuan new material Shenzhen port of Guangdong province 518000 city 5 floor of Building 2 Patentee after: Changyuan electronic (Group) Co., Ltd. Address before: 523419 Guangdong city of Shenzhen province Nanshan District science and Technology Park Keyuan Road Changyuan new material in Hong Kong Patentee before: ChangYuan Group Ltd. |