CN102913689A - Thermal insulating pipe and manufacturing method of thermal insulating pipe - Google Patents
Thermal insulating pipe and manufacturing method of thermal insulating pipe Download PDFInfo
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- CN102913689A CN102913689A CN2012104072048A CN201210407204A CN102913689A CN 102913689 A CN102913689 A CN 102913689A CN 2012104072048 A CN2012104072048 A CN 2012104072048A CN 201210407204 A CN201210407204 A CN 201210407204A CN 102913689 A CN102913689 A CN 102913689A
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Abstract
The invention provides a thermal insulating pipe and a manufacturing method of the thermal insulating pipe. The thermal insulating pipe is composed of a crosslinked polyethylene layer, a polyethylene thermal insulating layer and an ultraviolet radiation resisting polyethylene layer which are arranged from inside to outside in sequence, wherein an electric heating device is arranged between the crosslinked polyethylene layer and the polyethylene thermal insulating layer. Compared with the existing split-type single piece water conveying thermal insulating pipe, the thermal insulating pipe is an integer composed of the crosslinked polyethylene layer, the polyethylene thermal insulating layer, the ultraviolet radiation resisting polyethylene layer and the electric heating device; firstly, the aging resistance performance of the thermal insulating pipe is improved by the ultraviolet radiation resisting polyethylene layer; secondly, as the thermal insulating pipe is an integer, no thermal insulating materials need to be wrapped, so that the use is convenient, and the working quantity during the installation process is reduced; thirdly, as the electric heating device is added, the electric heating can be carried out, so that the liquid is prevented from being refrozen in a low temperature environment; and moreover the crosslinked polyethylene layer is used as the inner layer of a water conveying pipe, and crosslinking can be carried out slowing by using the heat of the liquid, thus the heat-resisting oxidation susceptibility of the water conveying pipe is improved.
Description
Technical field
The invention belongs to the pipe technology field, relate in particular to a kind of thermal insulation pipe and preparation method thereof.
Background technique
Pipeline (such as water pipe or tracheae) need not insulation and needs insulation (being thermal insulation pipe) two types, and the former be general commonly used pipeline, and such as running water pipe etc., interior temperature and the external environment of water pipe is consistent, and this pipeline only plays conveying; The latter is the pipeline of specific use, such as the heat supply water pipe, for cold water pipe, steam tube etc.Existing insulation pipe is identical with the material of general pipeline, its main material is steel or plastics, but all there is same problem in this bi-material, namely heat is transmitted faster, the energy (heat or cold) of the medium (such as water or gas etc.) in the pipeline is dispersed in the air by the heat transmission of pipeline, cause energy loss larger, cause energy waste, also be unfavorable for environmental protection.
The solution of insulation mainly is to coat the one layer of heat preservation layer in the outside of pipeline, and the defective of this method is: install cumbersomely, coat thermal insulation layer temporarily; Because artificial coating makes larger space is arranged between thermal insulation layer and the pipeline outer wall, the effect of described insulation is not ideal enough, still has larger energy to leak; Owing to existing energy to leak, thus safe not, particularly in the situation that the thermal insulation layer breakage, be easy to scald or the security incident such as frostbite and shorten working life of thermal insulation pipe.
The problem of bringing for solving artificial coating, in the production of foam folder shell thermal insulation pipe and cage walls, the extruding and moulding of mainly polyethylene being heated is coated on steel pipe or the foam layer, thereby forms even compact, continuous thermal insulation layer.This production method, inner tube are steel pipe, need steel pipe is fixed on the workbench; Outer is the PE pipe, injects polyurethane foams toward middle space.Polyurethane foam also claims polyurethane rigid foam plastic, how by the active hydrogen such as polyether polyol and isocyanates be main raw material under catalyst action, form through the chemical reaction foaming.The foaming tube of moulding in this way, the shortcoming such as because inner tube is steel pipe, cost is expensive, and does not accomplish continuous production, causes quality low, and cost is high, steel pipe gets rusty easily and working life is low.
At present, the employed water delivery thermal insulation pipe of solar energy water delivery water heater still is the split single-piece, be that inner tube is that high density polyethylene (HDPE) is coated outside polytene heat-insulation material, fix with the adhesive tape winding package again, the method has not only increased hand labor intensity, and fixedly the adhesive tape of usefulness easily owing to the ultraviolet irradiation skin that wears out is crisp, causes thermal insulating material to come off.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of thermal insulation pipe and preparation method thereof, and this thermal insulation pipe is ageing-resistant and easy to use.
The invention provides a kind of thermal insulation pipe, be followed successively by from inside to outside crosslinked polyethylene layer, polytene heat-insulation layer and UV resistant radiation polyethylene layer, have Electric heating appliance between described crosslinked polyethylene layer and the described polytene heat-insulation layer.
Preferably, the thickness of described crosslinked polyethylene layer is 1.9 ~ 2.1mm.
Preferably, the thickness of described polytene heat-insulation layer is 7 ~ 8mm.
Preferably, the thickness of described UV resistant radiation polyethylene layer is 0.45 ~ 0.55mm.
Preferably, described crosslinked polyethylene layer is by the high density polyethylene (HDPE) of 55 ~ 65 weight portions, the Low Density Polyethylene of 35 ~ 45 weight portions, the silane of 1 ~ 3 weight portion, 0.5 the antioxidant of ~ 1 weight portion, the di-n-butyltin dilaurate of the cumyl peroxide of 0.1 ~ 0.25 weight portion and 0.1 ~ 0.2 weight portion is made.
Preferably, described polytene heat-insulation layer is made by the Low Density Polyethylene of 100 weight portions, the stabilizer of 8 ~ 10 weight portions and the equal infusion of lubricant oil of 2 ~ 3 weight portions.
Preferably, described stabilizer is the butane stabilizer.
Preferably, described UV resistant radiation polyethylene layer is made by the ethylene-vinyl acetate copolymer of 15 ~ 20 weight portions, the Low Density Polyethylene of 60 ~ 65 weight portions, the calcium carbonate of 15 ~ 20 weight portions, the pigment of 1.5 ~ 2.5 weight portions and the ultraviolet protecting agent of 0.8 ~ 1.5 weight portion.
Preferably, described pigment is the blue or green serial pigment of titanium.
The present invention also provides a kind of preparation method of thermal insulation pipe, may further comprise the steps:
With the crosslinked polyethylene pellet, extrude and first one-step forming, obtain the crosslinked polyethylene layer of interior sky; Electric heating appliance is laid on the described crosslinked polyethylene layer, then the polytene heat-insulation pellet is extruded, be laid on the crosslinked polyethylene layer that contains Electric heating appliance, obtain the polytene heat-insulation layer; UV resistant radiation polyethylene pellet is extruded, be laid on the described polytene heat-insulation layer, then cooling and shaping obtains thermal insulation pipe.
The invention provides a kind of thermal insulation pipe and preparation method thereof, this thermal insulation pipe is followed successively by crosslinked polyethylene layer, polytene heat-insulation layer and UV resistant radiation polyethylene layer from inside to outside, has Electric heating appliance between described crosslinked polyethylene layer and the described polytene heat-insulation layer.Compare with existing split single-piece water delivery thermal insulation pipe, thermal insulation pipe of the present invention is the integral body that crosslinked polyethylene layer, polytene heat-insulation layer, UV resistant radiation polyethylene layer and Electric heating appliance form.At first, UV resistant radiation polyethylene layer has the effect of UV resistant radiation, has improved the ageing-resistant performance of thermal insulation pipe; Secondly, thermal insulation pipe of the present invention is an integral body, and it has thermal insulation layer, need not to wrap up thermal insulating material again, and is easy to use, has reduced the workload in the installation process; Again, contain Electric heating appliance, can carry out electric heating, thereby prevent that liquid from freezing under low temperature environment; And conduit pipe internal layer of the present invention is the crosslinked polyethylene layer, can utilize the temperature of liquid slowly to carry out crosslinked, has improved the heatproof oxidation performance energy of conduit pipe.
Description of drawings
Fig. 1 is thermal insulation pipe cross-sectional view of the present invention;
Fig. 2 is thermal insulation pipe preparation flow figure of the present invention.
Embodiment
The invention provides a kind of thermal insulation pipe, this thermal insulation pipe is followed successively by crosslinked polyethylene layer, polytene heat-insulation layer and UV resistant radiation polyethylene layer from inside to outside, has Electric heating appliance between described crosslinked polyethylene layer and the described polytene heat-insulation layer.
Wherein, the blank pipe internal diameter of described thermal insulation pipe is well known to those skilled in the art, can decide according to the requirement of using, and among the present invention, is preferably 11.5 ~ 12.5mm.
Described crosslinked polyethylene layer is internal layer, and its thickness is 1.9 ~ 2.1mm, is preferably 1.95 ~ 2.05mm.Described crosslinked polyethylene layer is by the high density polyethylene (HDPE) of 55 ~ 65 weight portions, the Low Density Polyethylene of 35 ~ 45 weight portions, the silane of 1 ~ 3 weight portion, the antioxidant of 0.5 ~ 1 weight portion, the di-n-butyltin dilaurate of the cumyl peroxide of 0.1 ~ 0.25 weight portion and 0.1 ~ 0.2 weight portion is made.
Wherein, described high density polyethylene (HDPE) is preferably 58 ~ 62 weight portions, more preferably 59 ~ 61 weight portions; Described Low Density Polyethylene is preferably 38 ~ 42 weight portions, more preferably 39 ~ 41 weight portions.
Described silane is preferably 1.5 ~ 2.5 weight portions, more preferably 1.8 ~ 2.2 weight portions.
Described antioxidant is antioxidant well known to those skilled in the art, is preferably phenol antioxidant, antioxidant 1010 more preferably, and its content is preferably 0.6 ~ 0.8 weight portion.
Described cumyl peroxide is preferably 0.15 ~ 0.2 weight portion, and described cumyl peroxide is chemical cross-linking agent, and its effect is to make between the polyethylene molecule to form reticular structure, improves resistance to high temperature and the intensity of material.
Described di-n-butyltin dilaurate is preferably 0.14 ~ 0.16 weight portion.
Among the present invention, described crosslinked polyethylene layer utilizes carries the temperature of liquid slowly to carry out crosslinked in the thermal insulation pipe, thereby the physical property of thermal insulation pipe and heatproof oxidation performance can all be improved, prolonged the working life of thermal insulation pipe, and cross-linking polyethylene materials also have higher cold tolerance.
The thickness of described polytene heat-insulation layer is 7 ~ 8mm, is preferably 7.4 ~ 7.8mm.Described polytene heat-insulation layer is made by the Low Density Polyethylene of 100 weight portions, the stabilizer of 8 ~ 10 weight portions and the equal infusion of lubricant oil of 2 ~ 3 weight portions.
Wherein, described stabilizer is stabilizer well known to those skilled in the art, is preferably the butane stabilizer, and its content is preferably 8 ~ 9.5 weight portions, more preferably 8 ~ 8.5 weight portions.
The equal infusion of described lubricant oil is equal infusion well known to those skilled in the art, is preferably the equal infusion of monoglyceride lubricant oil among the present invention, and its content is preferably 2.2 ~ 2.8 weight portions, more preferably 2.2 ~ 2.4 weight portions.
According to the present invention, the thickness of described UV resistant radiation polyethylene layer is 0.45 ~ 0.55mm, is preferably 0.48 ~ 0.52mm, more preferably 0.49 ~ 0.51mm.Described UV resistant radiation polyethylene layer is made by the ethylene-vinyl acetate copolymer of 15 ~ 20 weight portions, the Low Density Polyethylene of 60 ~ 65 weight portions, the calcium carbonate of 15 ~ 20 weight portions, the pigment of 1.5 ~ 2.5 weight portions and the ultraviolet protecting agent of 0.8 ~ 1.5 weight portion.
Wherein, described ethylene-vinyl acetate copolymer is preferably 18 ~ 20 weight portions; Described Low Density Polyethylene is preferably 60 ~ 63 weight portions; Described calcium carbonate is preferably 16 ~ 19 weight portions, more preferably 16 ~ 18 weight portions.
Described pigment is pigment well known to those skilled in the art, is preferably the blue or green serial pigment of titanium, and its content is preferably 1.8 ~ 2.4 weight portions, more preferably 1.8 ~ 2.2 weight portions.
Described ultraviolet protecting agent is ultraviolet protecting agent well known to those skilled in the art, is preferably ultraviolet light absorber among the present invention, ultraviolet absorbent UV-531 more preferably, and its content is preferably 0.8 ~ 1.2 weight portion.
Among the present invention, described UV resistant radiation polyethylene layer is added with ultraviolet protecting agent, has the effect of UV resistant radiation, has improved the ageing-resistant performance of thermal insulation pipe.
Electric heating appliance described in the present invention is Electric heating appliance well known to those skilled in the art, is preferably electrically-heated-wire, and it is between described crosslinked polyethylene layer and described polytene heat-insulation layer, it can become separately one deck, also be the part of one deck, do not occupy holostrome, there is no special restriction.Described Electric heating appliance can carry out electric heating, freezes phenomenon thereby can prevent from being incubated liquid in pipe under low temperature environment.
Thermal insulation pipe of the present invention is the integral body that crosslinked polyethylene layer, polytene heat-insulation layer, UV resistant radiation polyethylene layer and Electric heating appliance form; its cross section as shown in Figure 1; wherein 1 is UV resistant radiation polyethylene layer; 2 is the polyethylene protective layer; 3 is Electric heating appliance, and 4 is the crosslinked polyethylene layer.This aspect thermal insulation pipe self contains thermal insulation layer, need not to wrap up thermal insulating material again, and is easy to use, reduced the workload in the installation process.
The present invention also provides a kind of preparation method of thermal insulation pipe, may further comprise the steps: the crosslinked polyethylene pellet through No. 1 extruder, is extruded and first one-step forming, obtained the crosslinked polyethylene layer of interior sky; Electric heating appliance drawn through head be laid on the described crosslinked polyethylene layer, then through No. 2 extruders the polytene heat-insulation pellet is extruded, be laid on the crosslinked polyethylene layer that contains Electric heating appliance, obtain the polytene heat-insulation layer; UV resistant radiation polyethylene pellet is extruded through No. 3 extruders, be laid on the described polytene heat-insulation layer, then cooling and shaping obtains thermal insulation pipe.Described crosslinked polyethylene layer, described polytene heat-insulation layer, described UV resistant radiation polyethylene layer and described Electric heating appliance are same as above, do not repeat them here.
According to the present invention, described crosslinked polyethylene pellet is preferably by the high density polyethylene (HDPE) of 55 ~ 65 weight portions, the Low Density Polyethylene of 35 ~ 45 weight portions, the silane of 1 ~ 3 weight portion, 0.5 the antioxidant of ~ 1 weight portion, the di-n-butyltin dilaurate of the cumyl peroxide of 0.1 ~ 0.25 weight portion and 0.1 ~ 0.2 weight portion obtains through granulation, and the method for described granulation is well known to those skilled in the art, there is no special restriction, preferred prilling temperature is no more than 130 ℃ in the present invention.High density polyethylene (HDPE) described in the present invention, described Low Density Polyethylene, described silane, described antioxidant, described cumyl peroxide and described di-n-butyltin dilaurate are all same as above, do not repeat them here.
Described polytene heat-insulation pellet is preferably obtained through granulation by the Low Density Polyethylene of 100 weight portions, the stabilizer of 8 ~ 10 weight portions and the equal infusion of lubricant oil of 2 ~ 3 weight portions, the method of described granulation is well known to those skilled in the art, there is no special restriction, preferred prilling temperature is 110 ℃ ~ 130 ℃ in the present invention.Low Density Polyethylene described in the present invention, described stabilizer and the equal infusion of described lubricant oil are all same as above, do not repeat them here.
Described UV resistant radiation polyethylene pellet is obtained through granulation by the ethylene-vinyl acetate copolymer of 15 ~ 20 weight portions, the Low Density Polyethylene of 60 ~ 65 weight portions, the calcium carbonate of 15 ~ 20 weight portions, the pigment of 1.5 ~ 2.5 weight portions and the ultraviolet protecting agent of 0.8 ~ 1.5 weight portion, the method of described granulation is well known to those skilled in the art, there is no special restriction.Ethylene-vinyl acetate copolymer described in the present invention, described Low Density Polyethylene, described calcium carbonate, described pigment and described ultraviolet protecting agent are all same as above, do not repeat them here.
According to the present invention, the temperature of described No. 1 extruder is 115 ℃ ~ 120 ℃, is preferably 118 ℃ ~ 120 ℃.The method that described just one-step forming forms the crosslinked polyethylene layer of interior sky is method well known to those skilled in the art, there is no special restriction, and its blank pipe internal diameter is preferably 11.5 ~ 12.5mm.
The temperature of described No. 2 extruders is 170 ℃ ~ 180 ℃, is preferably 174 ℃ ~ 180 ℃, more preferably 175 ℃ ~ 178 ℃.
The temperature of described No. 3 extruders is 140 ℃ ~ 150 ℃, is preferably 142 ℃ ~ 148 ℃, more preferably 144 ℃ ~ 146 ℃.
The temperature of described cooling and shaping is 40 ℃ ~ 50 ℃, is preferably 42 ℃ ~ 48 ℃.
Behind cooling and shaping of the present invention, preferably also comprise rolling, the required internal diameter of described rolling is at least 1.5m.
The preparation method of thermal insulation pipe of the present invention is preferably a production technology production line, adopt the time processing forming technique, its preparation flow as shown in Figure 2, wherein A is No. 1 extruder, and B is head, and C is No. 2 extruders, D is No. 3 extruders, E is the cooling and shaping device, and F is meter-measuring device, and H is wrap-up.
In order to further specify the present invention, below in conjunction with embodiment a kind of thermal insulation pipe provided by the invention and preparation method thereof is described in detail.
Agents useful for same and electrically-heated-wire are commercially available in following examples.
1.1 the di-n-butyltin dilaurate of 60 weight portion high density polyethylene (HDPE)s, 40 weight portion Low Density Polyethylenes, 2 weight portion silane, 0.8 weight portion antioxidant 1010,0.2 weight portion cumyl peroxide and 0.15 weight portion is added Granulation Equipments, obtain the crosslinked polyethylene pellet, it is added No. 1 extruder, be to extrude under 120 ℃ the condition in temperature, just obtaining the blank pipe internal diameter behind the one-step forming is that 12mm crosslinked polyethylene layer thickness is the inner tube of 2mm, and heater wire is laid on the described crosslinked polyethylene layer through head.
1.2 the lubricated equal infusion of 100 weight portion Low Density Polyethylenes, 8 weight portion butane stabilizers and 2 weight portion monoglycerides is added Granulation Equipments, obtain polytene heat-insulation layer pellet, it is added No. 2 extruders, be to extrude under 175 ℃ the condition in temperature, be laid on the crosslinked polyethylene layer that contains heater wire that obtains in 1.1, form the polytene heat-insulation layer, its thickness is 7mm.
1.3 20 parts by weight of ethylene-acetate ethylene copolymer, 60 weight portion Low Density Polyethylenes, 17 weight portion calcium carbonate, the blue or green pigment of 2 weight portion titaniums and 1 weight portion ultraviolet absorbent UV-531 are added Granulation Equipments, obtain UV resistant radiation polyethylene pellet, it is added No. 3 extruders, be to extrude under 145 ℃ the condition in temperature, be laid on the polytene heat-insulation layer that forms in 1.2, form UV resistant radiation polyethylene layer, its thickness is 0.5mm, then through cooling and shaping device cooling and shaping under 45 ℃ of conditions, obtain the water delivery thermal insulation pipe.
Embodiment 2
2.1 the di-n-butyltin dilaurate of 62 weight portion high density polyethylene (HDPE)s, 42 weight portion Low Density Polyethylenes, 1 weight portion silane, 0.5 weight portion antioxidant 1010,0.2 weight portion cumyl peroxide and 0.15 weight portion is added Granulation Equipments, obtain the crosslinked polyethylene pellet, it is added No. 1 extruder, be to extrude under 120 ℃ the condition in temperature, just obtaining the blank pipe internal diameter behind the one-step forming is that 12mm crosslinked polyethylene layer thickness is the inner tube of 2mm, and heater wire is laid on the described crosslinked polyethylene layer through head.
2.2 the lubricated equal infusion of 100 weight portion Low Density Polyethylenes, 9 weight portion butane stabilizers and 2.5 weight portion monoglycerides is added Granulation Equipments, obtain polytene heat-insulation layer pellet, it is added No. 2 extruders, be to extrude under 175 ℃ the condition in temperature, be laid on the crosslinked polyethylene layer that contains heater wire that obtains in 2.1, form the polytene heat-insulation layer, its thickness is 7mm.
2.3 18 parts by weight of ethylene-acetate ethylene copolymer, 60 weight portion Low Density Polyethylenes, 17 weight portion calcium carbonate, the blue or green pigment of 2.2 weight portion titaniums and 1 weight portion ultraviolet absorbent UV-531 are added Granulation Equipments, obtain UV resistant radiation polyethylene pellet, it is added No. 3 extruders, be to extrude under 145 ℃ the condition in temperature, be laid on the polytene heat-insulation layer that forms in 2.2, form UV resistant radiation polyethylene layer, its thickness is 0.5mm, then through cooling and shaping device cooling and shaping under 45 ℃ of conditions, obtain the water delivery thermal insulation pipe.
Embodiment 3
3.1 the di-n-butyltin dilaurate of 55 weight portion high density polyethylene (HDPE)s, 40 weight portion Low Density Polyethylenes, 2 weight portion silane, 0.8 weight portion antioxidant 1010,0.22 weight portion cumyl peroxide and 0.2 weight portion is added Granulation Equipments, obtain the crosslinked polyethylene pellet, it is added No. 1 extruder, be to extrude under 120 ℃ the condition in temperature, just obtaining the blank pipe internal diameter behind the one-step forming is that 12mm crosslinked polyethylene layer thickness is the inner tube of 2mm, and heater wire is laid on the described crosslinked polyethylene layer through head.
3.2 the lubricated equal infusion of 100 weight portion Low Density Polyethylenes, 8 weight portion butane stabilizers and 2 weight portion monoglycerides is added Granulation Equipments, obtain polytene heat-insulation layer pellet, it is added No. 2 extruders, be to extrude under 175 ℃ the condition in temperature, be laid on the crosslinked polyethylene layer that contains heater wire that obtains in 3.1, form the polytene heat-insulation layer, its thickness is 7mm.
3.3 15 parts by weight of ethylene-acetate ethylene copolymer, 65 weight portion Low Density Polyethylenes, 17 weight portion calcium carbonate, the blue or green pigment of 2 weight portion titaniums and 1 weight portion ultraviolet absorbent UV-531 are added Granulation Equipments, obtain UV resistant radiation polyethylene pellet, it is added No. 3 extruders, be to extrude under 145 ℃ the condition in temperature, be laid on the polytene heat-insulation layer that forms in 3.2, form UV resistant radiation polyethylene layer, its thickness is 0.5mm, then through cooling and shaping device cooling and shaping under 45 ℃ of conditions, obtain the water delivery thermal insulation pipe.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a thermal insulation pipe is characterized in that, is followed successively by from inside to outside crosslinked polyethylene layer, polytene heat-insulation layer and UV resistant radiation polyethylene layer, has Electric heating appliance between described crosslinked polyethylene layer and the described polytene heat-insulation layer.
2. thermal insulation pipe according to claim 1 is characterized in that, the thickness of described crosslinked polyethylene layer is 1.9 ~ 2.1mm.
3. thermal insulation pipe according to claim 1 is characterized in that, the thickness of described polytene heat-insulation layer is 7 ~ 8mm.
4. thermal insulation pipe according to claim 1 is characterized in that, the thickness of described UV resistant radiation polyethylene layer is 0.45 ~ 0.55mm.
5. thermal insulation pipe according to claim 1, it is characterized in that, described crosslinked polyethylene layer is by the high density polyethylene (HDPE) of 55 ~ 65 weight portions, the Low Density Polyethylene of 35 ~ 45 weight portions, the silane of 1 ~ 3 weight portion, 0.5 the antioxidant of ~ 1 weight portion, the di-n-butyltin dilaurate of the cumyl peroxide of 0.1 ~ 0.25 weight portion and 0.1 ~ 0.2 weight portion is made.
6. thermal insulation pipe according to claim 1 is characterized in that, described polytene heat-insulation layer is made by the Low Density Polyethylene of 100 weight portions, the stabilizer of 8 ~ 10 weight portions and the equal infusion of lubricant oil of 2 ~ 3 weight portions.
7. thermal insulation pipe according to claim 6 is characterized in that, described stabilizer is the butane stabilizer.
8. thermal insulation pipe according to claim 1, it is characterized in that, described UV resistant radiation polyethylene layer is made by the ethylene-vinyl acetate copolymer of 15 ~ 20 weight portions, the Low Density Polyethylene of 60 ~ 65 weight portions, the calcium carbonate of 15 ~ 20 weight portions, the pigment of 1.5 ~ 2.5 weight portions and the ultraviolet protecting agent of 0.8 ~ 1.5 weight portion.
9. thermal insulation pipe according to claim 8 is characterized in that, described pigment is the blue or green serial pigment of titanium.
10. the preparation method of a thermal insulation pipe is characterized in that, may further comprise the steps:
With the crosslinked polyethylene pellet, extrude and first one-step forming, obtain the crosslinked polyethylene layer of interior sky; Electric heating appliance is laid on the described crosslinked polyethylene layer, then the polytene heat-insulation pellet is extruded, be laid on the crosslinked polyethylene layer that contains Electric heating appliance, obtain the polytene heat-insulation layer; UV resistant radiation polyethylene pellet is extruded, be laid on the described polytene heat-insulation layer, then cooling and shaping obtains thermal insulation pipe.
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| CN114573895A (en) * | 2021-11-26 | 2022-06-03 | 浙江中财管道科技股份有限公司 | Heat-insulation integrated heat-resistant polyethylene pipe and preparation method thereof |
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| CN113700949A (en) * | 2021-09-02 | 2021-11-26 | 芜湖达锦新材料科技有限公司 | Thermal insulation pipe with good stability for air conditioner made of modified polyethylene material and preparation method of thermal insulation pipe |
| CN114573895A (en) * | 2021-11-26 | 2022-06-03 | 浙江中财管道科技股份有限公司 | Heat-insulation integrated heat-resistant polyethylene pipe and preparation method thereof |
| CN114573895B (en) * | 2021-11-26 | 2023-08-29 | 浙江中财管道科技股份有限公司 | Heat-insulating integrated heat-resistant polyethylene pipe and preparation method thereof |
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| CN102913689B (en) | 2016-02-24 |
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