CN105623038A - Polyethylene foaming thermal insulation pipe, and preparation method thereof - Google Patents
Polyethylene foaming thermal insulation pipe, and preparation method thereof Download PDFInfo
- Publication number
- CN105623038A CN105623038A CN201410608806.9A CN201410608806A CN105623038A CN 105623038 A CN105623038 A CN 105623038A CN 201410608806 A CN201410608806 A CN 201410608806A CN 105623038 A CN105623038 A CN 105623038A
- Authority
- CN
- China
- Prior art keywords
- layer
- foaming
- thermal insulation
- weight portion
- polyethylene foam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Thermal Insulation (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a polyethylene foaming thermal insulation pipe, and a preparation method thereof. The preparation method is used for solving problems of the prior art that thermal insulation properties and shock resistance of conventional solar energy pipelines are poor. The polyethylene foaming thermal insulation pipe possesses a three-layer structure; an outer layer is a protection layer; a middle layer is a thermal insulation layer; and an inner layer is a water delivery pipe. The thermal insulation layer comprises, by weight, 50 to 100 parts of a polyethylene foaming material, 0.1 to 0.6 part of an AC foaming agent, and 0.1 to 0.6 part of a foaming control agent. The polyethylene foaming thermal insulation pipe possesses the water delivery inner layer-the thermal insulation layer-the outer protection layer trinity structure; thermal insulation properties are better; the inner layer possesses antibacterial properties, so that pollution on fluid is not caused; foaming of the thermal insulation layer is realized with the polyethylene foaming material, the AC foaming agent, and ACR foaming control agent; the AC foaming agent and the ACR foaming control agent are mixed with polyethylene via physical blending, so that product surface is smooth, and impact resistance is excellent; and the outer protection layer made from a communication-grade cable material, and possesses relatively excellent aging resistance and ultraviolet resistance.
Description
Technical field
The present invention relates to solar energy aqueduct field, particularly relate to a kind of polyethylene Foam Insulating Pipe and preparation method thereof.
Background technology
Along with popularizing of Solar use, all kinds of solar water heaters arise at the historic moment, the main cause restricting Application of Solar Energy at present is that cost is high, estimate according to the market price in 2009, the price of the regular solar water heater in present market is at about 2000 yuan, and carry hot water to be typically in about 400-700 unit to the refractory metal pipeline at family, account for 1/3, reduce one of this part expense key factor just becoming reduction overall price, metallic conduit is in anti-corrosive properties, all opposed plastic material is poor to install the aspects such as convenience, additionally the world is energy-saving and cost-reducing in promotion, therefore people put into sight on plastic tube gradually, plastic tube in the market is mainly crosslinked polyethylene pipe and a small amount of resistance to thermal-enhanced polyethylene monolayer or bimetallic tube, these plastic tubes are under long-term illumination, fade aging soon, life-span is short, and cold, hot water alternately under, the impact resistance of pipeline is poor.
Summary of the invention
The present invention proposes a kind of polyethylene Foam Insulating Pipe and preparation method thereof, the problem solving polyethylene pipe poor thermal insulation property in prior art, impact resistance difference.
The technical scheme is that and be achieved in that, a kind of polyethylene Foam Insulating Pipe, described insulating tube is three-decker, and outer layer is protective layer, and intermediate layer is heat-insulation layer, internal layer is water-supply-pipe, and described heat-insulation layer comprises the raw material of following weight portion:
Polyethylene foam material 50��100 weight portion
AC foaming agent 0.1��0.6 weight portion
Foaming control agent 0.1��0.6 weight portion.
As preferred technical scheme, described heat-insulation layer comprises the raw material of following weight portion:
Polyethylene foam material 75 weight portion
AC foaming agent 0.2 weight portion
Foaming control agent 0.2 weight portion.
As preferred technical scheme, described foaming control agent is ACR, and described ACR is prepared from by step polymerization by methyl methacrylate, butyl acrylate, styrene, and the proportioning of wherein said methyl methacrylate and described butyl acrylate is 2: 3.
As preferred technical scheme, described outer layer is the one in TPE, EVA material, and described internal layer is the one in PE, PE-RT, PE-X, PP-R, metal tube material.
One prepares polyethylene Foam Insulating Pipe method, including following preparation process:
1) raw material of internal layer, intermediate layer and outer layer each layer raw material of Homogeneous phase mixing are weighed by weight proportion respectively;
2) mixed for described internal layer raw material is put in the first extruder, by vacuum sizing forming machine molding, is then involved by the first traction machine, pipe in preparing, after said inner tube delivered to co-extrusion type head place;
3) mixed for described intermediate layer raw material is put in the second extruder, the extruder temperature of described second extruder is 70��200 DEG C, pressure is 15��30MPa, and pass into catalytic gas in described screw rod, mixed material is made to melt to described co-extrusion type head place, same, outer layer extruded stock also delivers to described co-extrusion type head place;
4) by described intermediate layer extruded stock and institute's outer layer extruded stock at described co-extrusion type head endomixis, prepare and merge material;
5) being coated in said inner tube by described fusion after material is extruded, post-foaming prepares required pipeline, described pipeline is sent into cool wind box qualitative, the second traction machine involves, acquisition shaping pipe after the cutting of cleaved machine or winder rolling.
As preferred technical scheme, step 3) described in catalytic gas be the one in liquefied gas, butagas.
As preferred technical scheme, step 3) described in the screw speed 30��100rpm of the second extruder.
The present invention compares produced beneficial effect with background technology:
Insulating tube adopts water delivery internal layer, heat-insulation layer and the Trinitarian structure of external protection, heat-insulating property is better, and internal layer can be antibacterial, will not produce to pollute by convection cell, heat-insulation layer passes through polyethylene foam material, AC foaming agent, ACR foaming control agent carries out foaming and forms, AC is azodicarbonamide, it it is most widely used foaming agent, ACR is methyl methacrylate, the copolymer of acrylate monomer, adding portion styrene can reduce cost, improve the melt fluidity of polyethylene foam material, ACR is the best impact modifying agent developed in recent years, it can make the impact strength of material increase several ten times larger, it is particularly suited for PVC plastic goods impact modified of outdoor use, AC foaming agent and ACR foaming control agent introduce polyethylene by the method for physical blending, AC can be made, ACR granule is uniformly distributed in polyethylene, make product surface bright and clean, good impact resistant effect, external protection is communication stage CABLE MATERIALS, it is bonded into adult by high temperature heat seal and heat-insulation layer, there is stronger aging resistance, anti-ultraviolet performance, the present invention adopts the foam process of co-extrusion type, make three-layer pipe completely adhesion-molded, preparation is simple.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of polytene heat-insulation foaming tube of the present invention.
In figure: 1-outer layer; 2-intermediate layer; 3-internal layer.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
As it is shown in figure 1, a kind of polyethylene Foam Insulating Pipe, insulating tube is three-decker, and outer layer 1 is protective layer, and intermediate layer 2 is heat-insulation layer, and internal layer 3 is water-supply-pipe, and described heat-insulation layer comprises the raw material of following weight portion:
Polyethylene foam material 50��100 weight portion
AC foaming agent 0.1��0.6 weight portion
Foaming control agent 0.1��0.6 weight portion.
As preferred technical scheme, described heat-insulation layer comprises the raw material of following weight portion:
Polyethylene foam material 75 weight portion
AC foaming agent 0.2 weight portion
Foaming control agent 0.2 weight portion.
As preferred technical scheme, described foaming control agent is ACR, and described ACR is prepared from by step polymerization by methyl methacrylate, butyl acrylate, styrene, and the proportioning of wherein said methyl methacrylate and described butyl acrylate is 2: 3.
As preferred technical scheme, described outer layer 1 is the one in TPE, EVA material, and described internal layer 3 is the one in PE, PE-RT, PE-X, PP-R, metal tube material.
One prepares polyethylene Foam Insulating Pipe method, including following preparation process:
1) raw material of internal layer 3, intermediate layer 2 and outer layer 1 each layer raw material of Homogeneous phase mixing are weighed by weight proportion respectively;
2) the described mixed raw material of internal layer 3 is put in the first extruder, by vacuum sizing forming machine molding, is then involved by the first traction machine, pipe in preparing, after said inner tube delivered to co-extrusion type head place;
3) the mixed raw material in described intermediate layer 2 is put in the second extruder, the extruder temperature of described second extruder is 70��200 DEG C, pressure is 15��30MPa, and pass into catalytic gas in described screw rod, mixed material is made to melt to described co-extrusion type head place, same, outer layer 1 extruded stock also delivers to described co-extrusion type head place;
4) by described intermediate layer 2 extruded stock and institute's outer layer 1 extruded stock at described co-extrusion type head endomixis, prepare and merge material;
5) being coated in said inner tube by described fusion after material is extruded, post-foaming prepares required pipeline, described pipeline is sent into cool wind box qualitative, the second traction machine involves, acquisition shaping pipe after the cutting of cleaved machine or winder rolling.
As preferred technical scheme, step 3) described in catalytic gas be the one in liquefied gas, butagas.
As preferred technical scheme, step 3) described in the screw speed 30��100rpm of the second extruder.
Embodiment one
One prepares polyethylene Foam Insulating Pipe method, including following preparation process:
1) weigh the raw material of internal layer 3, intermediate layer 2 and outer layer 1 by weight proportion respectively, namely polyethylene foam material 50 weight portion, AC foaming agent 0.1 weight portion, ACR foaming control agent 0.1 weight portion, and each layer raw material of Homogeneous phase mixing;
2) the described mixed raw material of internal layer 3 is put in the first extruder, by vacuum sizing forming machine molding, is then involved by the first traction machine, pipe in preparing, after said inner tube delivered to co-extrusion type head place;
3) the mixed raw material in described intermediate layer 2 is put in the second extruder, the extruder temperature of described second extruder is 70��200 DEG C, pressure is 15MPa, and pass into catalytic gas in described screw rod, catalytic gas is liquefied gas, and screw speed is 30rpm so that mixed material melts to described co-extrusion type head place, same, outer layer 1 extruded stock also delivers to described co-extrusion type head place;
4) by described intermediate layer 2 extruded stock and institute's outer layer 1 extruded stock at described co-extrusion type head endomixis, prepare and merge material;
5) being coated in said inner tube by described fusion after material is extruded, post-foaming prepares required pipeline, described pipeline is sent into cool wind box qualitative, the second traction machine involves, acquisition shaping pipe after the cutting of cleaved machine or winder rolling.
Embodiment two
One prepares polyethylene Foam Insulating Pipe method, including following preparation process:
1) weigh the raw material of internal layer 3, intermediate layer 2 and outer layer 1 by weight proportion respectively, namely polyethylene foam material 75 weight portion, AC foaming agent 0.2 weight portion, ACR foaming control agent 0.2 weight portion, and each layer raw material of Homogeneous phase mixing;
2) the described mixed raw material of internal layer 3 is put in the first extruder, by vacuum sizing forming machine molding, is then involved by the first traction machine, pipe in preparing, after said inner tube delivered to co-extrusion type head place;
3) the mixed raw material in described intermediate layer 2 is put in the second extruder, the extruder temperature of described second extruder is 70��200 DEG C, pressure is 20MPa, and pass into catalytic gas in described screw rod, catalytic gas is butane, and screw speed is 70rpm so that mixed material melts to described co-extrusion type head place, same, outer layer 1 extruded stock also delivers to described co-extrusion type head place;
4) by described intermediate layer 2 extruded stock and institute's outer layer 1 extruded stock at described co-extrusion type head endomixis, prepare and merge material;
5) being coated in said inner tube by described fusion after material is extruded, post-foaming prepares required pipeline, described pipeline is sent into cool wind box qualitative, the second traction machine involves, acquisition shaping pipe after the cutting of cleaved machine or winder rolling.
Embodiment three
One prepares polyethylene Foam Insulating Pipe method, including following preparation process:
1) weigh the raw material of internal layer 3, intermediate layer 2 and outer layer 1 by weight proportion respectively, namely polyethylene foam material 80 weight portion, AC foaming agent 0.3 weight portion, ACR foaming control agent 0.4 weight portion, and each layer raw material of Homogeneous phase mixing;
2) the described mixed raw material of internal layer 3 is put in the first extruder, by vacuum sizing forming machine molding, is then involved by the first traction machine, pipe in preparing, after said inner tube delivered to co-extrusion type head place;
3) the mixed raw material in described intermediate layer 2 is put in the second extruder, the extruder temperature of described second extruder is 70��200 DEG C, pressure is 25MPa, and pass into catalytic gas in described screw rod, catalytic gas is liquefied gas, and screw speed is 80rpm so that mixed material melts to described co-extrusion type head place, same, outer layer 1 extruded stock also delivers to described co-extrusion type head place;
4) by described intermediate layer 2 extruded stock and institute's outer layer 1 extruded stock at described co-extrusion type head endomixis, prepare and merge material;
5) being coated in said inner tube by described fusion after material is extruded, post-foaming prepares required pipeline, described pipeline is sent into cool wind box qualitative, the second traction machine involves, acquisition shaping pipe after the cutting of cleaved machine or winder rolling.
Embodiment four
One prepares polyethylene Foam Insulating Pipe method, including following preparation process:
1) weigh the raw material of internal layer 3, intermediate layer 2 and outer layer 1 by weight proportion respectively, namely polyethylene foam material 100 weight portion, AC foaming agent 0.6 weight portion, ACR foaming control agent 0.6 weight portion, and each layer raw material of Homogeneous phase mixing;
2) the described mixed raw material of internal layer 3 is put in the first extruder, by vacuum sizing forming machine molding, is then involved by the first traction machine, pipe in preparing, after said inner tube delivered to co-extrusion type head place;
3) the mixed raw material in described intermediate layer 2 is put in the second extruder, the extruder temperature of described second extruder is 70��200 DEG C, pressure is 30MPa, and pass into catalytic gas in described screw rod, catalytic gas is liquefied gas, and screw speed is 100rpm so that mixed material melts to described co-extrusion type head place, same, outer layer 1 extruded stock also delivers to described co-extrusion type head place;
4) by described intermediate layer 2 extruded stock and institute's outer layer 1 extruded stock at described co-extrusion type head endomixis, prepare and merge material;
5) being coated in said inner tube by described fusion after material is extruded, post-foaming prepares required pipeline, described pipeline is sent into cool wind box qualitative, the second traction machine involves, acquisition shaping pipe after the cutting of cleaved machine or winder rolling.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (7)
1. a polyethylene Foam Insulating Pipe, described insulating tube is three-decker, and outer layer is protective layer, and intermediate layer is heat-insulation layer, and internal layer is water-supply-pipe, it is characterised in that described heat-insulation layer comprises the raw material of following weight portion:
Polyethylene foam material 50��100 weight portion
AC foaming agent 0.1��0.6 weight portion
Foaming control agent 0.1��0.6 weight portion.
2. a kind of polyethylene Foam Insulating Pipe as claimed in claim 1, it is characterised in that described heat-insulation layer comprises the raw material of following weight portion:
Polyethylene foam material 75 weight portion
AC foaming agent 0.2 weight portion
Foaming control agent 0.2 weight portion.
3. a kind of polyethylene Foam Insulating Pipe as described in any one of claim 1 to 2, it is characterised in that:
Described foaming control agent is ACR, and described ACR is prepared from by step polymerization by methyl methacrylate, butyl acrylate, styrene, and the proportioning of wherein said methyl methacrylate and described butyl acrylate is 2:3.
4. a kind of polyethylene Foam Insulating Pipe as claimed in claim 1, it is characterised in that:
Described outer layer is the one in TPE, EVA material, and described internal layer is the one in PE, PE-RT, PE-X, PP-R, metal tube material.
5. prepare polyethylene Foam Insulating Pipe method as claimed in claim 1 for one kind, it is characterised in that include following preparation process:
1) raw material of internal layer, intermediate layer and outer layer each layer raw material of Homogeneous phase mixing are weighed by weight proportion respectively;
2) mixed for described internal layer raw material is put in the first extruder, by vacuum sizing forming machine molding, is then involved by the first traction machine, pipe in preparing, after said inner tube delivered to co-extrusion type head place;
3) mixed for described intermediate layer raw material is put in the second extruder, the screw rod operating temperature of described second extruder is 70��200 DEG C, pressure is 15��30MPa, and pass into catalytic gas in described screw rod, mixed material is made to melt to described co-extrusion type head place, same, outer layer extruded stock also delivers to described co-extrusion type head place;
4) by described intermediate layer extruded stock and institute's outer layer extruded stock at described co-extrusion type head endomixis, prepare and merge material;
5) being coated in said inner tube by described fusion after material is extruded, post-foaming prepares required pipeline, described pipeline is sent into cool wind box qualitative, the second traction machine involves, acquisition shaping pipe after the cutting of cleaved machine or winder rolling.
6. a kind of polyethylene Foam Insulating Pipe preparation method as claimed in claim 4, it is characterised in that:
Step 3) described in catalytic gas be the one in liquefied gas, butagas.
7. a kind of polyethylene Foam Insulating Pipe preparation method as claimed in claim 4, it is characterised in that:
Step 3) described in the screw speed 30��100rpm of the second extruder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410608806.9A CN105623038A (en) | 2014-11-03 | 2014-11-03 | Polyethylene foaming thermal insulation pipe, and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410608806.9A CN105623038A (en) | 2014-11-03 | 2014-11-03 | Polyethylene foaming thermal insulation pipe, and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105623038A true CN105623038A (en) | 2016-06-01 |
Family
ID=56038412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410608806.9A Pending CN105623038A (en) | 2014-11-03 | 2014-11-03 | Polyethylene foaming thermal insulation pipe, and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105623038A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106113534A (en) * | 2016-06-20 | 2016-11-16 | 宁夏青龙塑料管材有限公司 | A kind of PERT II utilidor one step processing technique |
| CN106279875A (en) * | 2016-08-09 | 2017-01-04 | 大禹节水（天津）有限公司 | A kind of novel polyethylene floor heating pipe and preparation method |
| CN107061877A (en) * | 2017-06-12 | 2017-08-18 | 奥品科技有限公司 | A kind of new prefabricated thermal insulation is anti-to shine plastic composition pipeline and preparation method thereof |
| CN107269948A (en) * | 2017-06-07 | 2017-10-20 | 海宁亚丰塑业有限公司 | A kind of heat-insulated PPR pipe and its preparation technology |
| CN107314194A (en) * | 2017-06-07 | 2017-11-03 | 海宁亚丰塑业有限公司 | A kind of metal pipe with heat-insulating and its preparation technology |
| CN112592546A (en) * | 2021-02-26 | 2021-04-02 | 山东宏福化学有限公司 | Special composite ACR foaming regulator for PVC shoe material |
| CN113845712A (en) * | 2021-09-28 | 2021-12-28 | 日丰企业集团有限公司 | Flame-retardant mute high-rise PE drain pipe and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012323A (en) * | 2007-02-01 | 2007-08-08 | 徐晓冰 | Polythene physics foaming material and preparing method thereof |
| CN102155599A (en) * | 2011-04-28 | 2011-08-17 | 钜电(昆山)科技管线有限公司 | Bridging-type seamless polyethylene foamed thermal insulation pipe |
-
2014
- 2014-11-03 CN CN201410608806.9A patent/CN105623038A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012323A (en) * | 2007-02-01 | 2007-08-08 | 徐晓冰 | Polythene physics foaming material and preparing method thereof |
| CN102155599A (en) * | 2011-04-28 | 2011-08-17 | 钜电(昆山)科技管线有限公司 | Bridging-type seamless polyethylene foamed thermal insulation pipe |
Non-Patent Citations (3)
| Title |
|---|
| 张清玉主编: "《油气田工程实用防腐蚀技术》", 30 September 2009, 北京：中国石化出版社 * |
| 张玉龙主编: "《塑料配方及其组分设计宝典》", 31 January 2006, 北京：机械工业出版社 * |
| 陶子斌主编: "《丙烯酸生产与应用技术》", 28 February 2007, 北京：化学工业出版社 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106113534A (en) * | 2016-06-20 | 2016-11-16 | 宁夏青龙塑料管材有限公司 | A kind of PERT II utilidor one step processing technique |
| CN106113534B (en) * | 2016-06-20 | 2019-03-26 | 宁夏青龙塑料管材有限公司 | A kind of PERT utilidor one step processing technique |
| CN106279875A (en) * | 2016-08-09 | 2017-01-04 | 大禹节水（天津）有限公司 | A kind of novel polyethylene floor heating pipe and preparation method |
| CN107269948A (en) * | 2017-06-07 | 2017-10-20 | 海宁亚丰塑业有限公司 | A kind of heat-insulated PPR pipe and its preparation technology |
| CN107314194A (en) * | 2017-06-07 | 2017-11-03 | 海宁亚丰塑业有限公司 | A kind of metal pipe with heat-insulating and its preparation technology |
| CN107061877A (en) * | 2017-06-12 | 2017-08-18 | 奥品科技有限公司 | A kind of new prefabricated thermal insulation is anti-to shine plastic composition pipeline and preparation method thereof |
| CN112592546A (en) * | 2021-02-26 | 2021-04-02 | 山东宏福化学有限公司 | Special composite ACR foaming regulator for PVC shoe material |
| CN113845712A (en) * | 2021-09-28 | 2021-12-28 | 日丰企业集团有限公司 | Flame-retardant mute high-rise PE drain pipe and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105623038A (en) | Polyethylene foaming thermal insulation pipe, and preparation method thereof | |
| CN105987237B (en) | The high-strength pipe of thermoplastic continuous fibers prepreg tape and its manufacturing method and manufacturing equipment | |
| CN106641585B (en) | A kind of house ornamentation PPR composite insulating pipes and preparation method thereof | |
| CN105757357B (en) | A kind of glass fiber reinforcement PERT pipelines are prefabricated direct-buried heat-preservation plastic pipeline of instrumentation tubes and preparation method thereof | |
| CN105965903B (en) | Prefabricated direct-buried heat preservation PPR compound pipeline complex pipelines of one kind and preparation method thereof | |
| CN105823108A (en) | Ultra-distance steam conveying pipeline | |
| CN209309492U (en) | A kind of expanded polystyrene (EPS) direct-burried thermal insulating plastic composite tube road | |
| CN207922346U (en) | Tube-in-tube and the pipe fitting for connecting tube-in-tube | |
| CN104945799A (en) | Thermal insulation plastic pipeline | |
| CN106881891A (en) | The production moulding process of the dual anti-PP multiple tubes of steel wire under coal mine net/fiber mesh skeleton | |
| CN205371846U (en) | Ground heating coil | |
| CN101418887A (en) | Aluminum plastic laminated tube and method for producing the same | |
| CN211344279U (en) | Continuous glass fiber tape polyethylene composite pipe | |
| CN204477518U (en) | A kind of central air-conditioner prefabricated thermal insulation plastic composite pipe | |
| CN203082397U (en) | Direct-melting type steady-state tube | |
| CN209469896U (en) | A kind of novel multi-pipeline mixing heat preservation piping | |
| CN202266763U (en) | Double-orientation fiber reinforcement random copolymerization polypropylene three-layer composite pipe | |
| CN201795184U (en) | Composite pipe | |
| CN202868105U (en) | Steel wire mesh framework normal temperature rapid self-crosslinking PE composite pipe | |
| CN206943695U (en) | A kind of house ornamentation PPR composite insulating pipes | |
| CN206130403U (en) | Hot melt formula RTP high -pressure pipe joint | |
| CN205479775U (en) | Compound pipe of steel mesh skeleton plastics | |
| CN112696535A (en) | Prefabricated heat-preservation continuous glass fiber prepreg tape reinforced pipe | |
| CN206988594U (en) | A kind of thermal-insulation heat-resistant type PP R pipes | |
| CN207922345U (en) | A kind of thermal cycle system with water knockout drum |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160601 |