CN201096235Y

CN201096235Y - Plastic pipe material with surface foaming layer

Info

Publication number: CN201096235Y
Application number: CNU2007201744423U
Authority: CN
Inventors: 骆光勤; 王佳仕
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-08-31
Filing date: 2007-08-31
Publication date: 2008-08-06
Anticipated expiration: 2017-08-31

Abstract

The utility model discloses a plastic pipe with a foamed outer layer, relating to plastic pipes used in low temperature. Aiming at solving the problem of poor cold resistance of current the plastic pipe of a water pipeline, the utility model provides a plastic pipe with a foamed outer layer, which comprises a plastic inner tube which is wrapped with a heat preservation layer at the outer wall. The plastic pipe with a foamed outer layer is not easy to craze under low temperature; therefore the plastic pipe of the utility model can not only be applied to a water pipeline under room temperature but also can be applied to a water pipeline under low temperature.

Description

The plastic tube of band epidermis foaming layer

Technical field

The utility model relates to plastic tube, particularly a kind of plastic tube that uses at low temperatures.

Background technique

In industry and residential construction, all be unable to do without feedwater piping, since country issues an order against after Coating Steel Pipe is used for the regulations of feedwater piping, existing feedwater piping material mainly adopts novel plastics pipe, for example: PP-R (atactic copolymerized polypropene) pipe, PE-RT (refractory polyethylene) pipe, PE-X (crosslinked polyethylene) pipe and PE (polyethylene) pipe etc.Above-mentioned novel plastics pipe all has good heat resistance, advantage such as anticorrosive, and still, it has a common shortcoming, under low temperature environment, has cold shortness.For example: the current feedwater piping material that the most generally uses---three type PP-R pipe, in the time of-10 ℃, the phenomenon that will occur ftractureing.

Described novel plastics pipe has cold shortness, and it is easy to cracking under low temperature environment, causes reduce the working life of tubing, and is unfavorable for that described novel plastics pipe is severe cold season or applying at northern area.

The model utility content

The utility model provides a kind of plastic tube with the epidermis foaming layer, the plastic tube of described band epidermis foaming layer can solve be used for feedwater piping in the prior art plastic tube under low temperature environment, the easy problem of cracking.

In order to solve the problems of the technologies described above, the plastic tube of the band epidermis foaming layer that the utility model provides comprises: plastic inner pipe, the outer wall of described plastic inner pipe is coated with thermal insulation layer.

The plastic tube of band epidermis provided by the utility model foaming layer, by coating one deck thermal insulation layer at the plastic inner pipe outer wall, extraneous cool air is blocked on outside the thermal insulation layer, and the temperature of the plastic tube self of band epidermis foaming layer can be very not low, the phenomenon of cold short cracking can not occur; Make the plastic tube of described band epidermis foaming layer compare with existing plastic tube, its winter resistance is higher; The plastic tube of this band epidermis foaming layer also can normally use at temperature lower winter and northern area; And, the plastic tube longer service life at low temperatures of described band epidermis foaming layer.

Description of drawings

The sectional view of the plastic tube of the band epidermis foaming layer that Fig. 1 provides for the utility model;

Fig. 2 is the preparation process flow chart of the used foaming master batch of the thermal insulation layer of plastic tube of band epidermis shown in Figure 1 foaming layer;

Fig. 3 is the preparation process flow chart of the plastic tube of band epidermis shown in Figure 1 foaming layer.

Embodiment

In order to solve existence is used for feedwater piping in the prior art plastic tube under low temperature environment, the problem of cracking easily, the utility model provides a kind of plastic tube with the epidermis foaming layer, below in conjunction with drawings and Examples the utility model is elaborated.

As shown in Figure 1, the plastic tube of band epidermis provided by the utility model foaming layer, comprise: plastic inner pipe 1, outer wall at described plastic inner pipe 1 is coated with thermal insulation layer 3, in order to make described thermal insulation layer 3 be difficult for coming off, be provided with adhesive-layer 2 between described plastic inner pipe 1 and the thermal insulation layer 3 from plastic inner pipe 1.

Described thermal insulation layer 3 can be made of any one thermal insulating material on the market, for example: polyethylene foamed closed cell thermal insulating material etc.Preferred a kind of foam material of design voluntarily of the utility model, as shown in Figure 2, the preparation process flow process of the foaming master batch of described foam material is: according to a certain percentage LDPE (low density polyethylene), stabilizer and various auxiliary agent (for example: cumyl peroxide, French chalk, Cornstarch and calcium stearate etc.) are mixed; The mixture that obtains is extruded behind high temperature, high pressure; Cooling forming, and cooled material is cut into a certain size particle; The material that obtains after the pelletizing is described foaming master batch.Described foaming master batch is mixed with PP (polypropylene) and cumyl peroxide, and with the gained mixture after high temperature, high pressure are extruded (this step, not shown), promptly obtain the thermal insulation layer that the foam material by the utility model design constitutes.The density of described foam material is little, abscess quantity is many, and its heat conductivity is compared lower with other thermal insulating materials, and antifreezing effect is better, and it has advantages such as sound-absorbing, buffering.

According to the purposes difference, all-plastic pipes such as described plastic inner pipe 1 not only can be managed for PP-R, PE-RT pipe, PE pipe or PE-X pipe also can be the composite pipe of plastics such as plastic-aluminum polypropylene random copolymer composite tube, plastic-aluminum atactic copolymerized polypropene stable state pipe or aluminium-plastic composite pipe and metal.

Described adhesive-layer 2 is can adhesion plastic inner pipe 1 and any one tackiness agent of thermal insulation layer 3, for example: polyvinyl chloride adhesive.

Be that the PP-R pipe is an example with described plastic inner pipe 1 below, describe:

As shown in Figure 3, the preparation process flow process of the plastic tube of the band epidermis foaming layer that provides of the utility model is: extrude PP-R pipe, adhesive-layer and thermal insulation layer respectively; Described PP-R pipe, adhesive-layer and thermal insulation layer are passed through a coextrusion mold technology, the plastic tube of the band epidermis foaming layer that formation the utility model provides; The plastic tube of described band epidermis foaming layer cuts according to predetermined length behind cooling and shaping, obtains finished product.

In the process of using, the Placement of the plastic tube of band epidermis provided by the utility model foaming layer has two kinds: hot melt connects and adopts copper pipe fitting to be connected.

Wherein, hot melt connect to be that at described plastic inner pipe for the material that can hot melt connects, for example: described plastic inner pipe is PP-R pipe, PE-RT pipe, PE pipe or plastic-aluminum PP-R composite pipe, plastic-aluminum PP-R stable state pipe etc.Before the plastic tube of described band epidermis foaming layer carries out the hot melt connection, earlier thermal insulation layer and adhesive-layer are dialled except that clean with special-purpose cutter, carry out the hot melt connection then.The melt process that provides in the method that described hot melt connects and the prior art is identical, repeats no more herein;

Adopt copper pipe fitting to connect mainly to be at the material that can not hot melt connects, for example: aluminium-plastic composite pipe and PE-X pipe etc.When the plastic tube of described band epidermis foaming layer utilizes copper pipe fitting to connect, do not need thermal insulation layer and adhesive-layer dialled and remove, can directly connect.

Plastic pipe with the epidermis foaming layer provided by the utility model is by coating at the plastic inner pipe outer wall The one layer of heat preservation layer, extraneous cold air is blocked on outside the heat-insulation layer, with the plastic pipe self of epidermis foaming layer Temperature can be very not low, the phenomenon of cold short cracking can not appear; So that described plastic tube with the epidermis foaming layer Material is compared with existing plastic tube, and its winter resistance is higher; This with the plastic pipe of epidermis foaming layer in temperature Low winter and northern area also can normally use; And, described plastic pipe with the epidermis foaming layer Longer service life at low temperatures.

Plastic pipe with the epidermis foaming layer provided by the utility model is difficult for cold short opening under low temperature environment Split, not only can use at normal temperatures in the feedwater piping, also can be applied in the feedwater piping under the low temperature environment In.

Claims

1. plastic tube with the epidermis foaming layer, comprising: plastic inner pipe is characterized in that the outer wall of described plastic inner pipe is coated with thermal insulation layer.

2. the plastic tube of band epidermis according to claim 1 foaming layer is characterized in that, is provided with adhesive-layer between described plastic inner pipe and the thermal insulation layer.

3. the plastic tube of band epidermis according to claim 1 and 2 foaming layer is characterized in that, described thermal insulation layer is that foam material constitutes.

4. the plastic tube of band epidermis according to claim 3 foaming layer is characterized in that, described plastic inner pipe is overall plastic pipe, perhaps is the composite pipe of plastics and metal.

5. the plastic tube of band epidermis according to claim 4 foaming layer is characterized in that, described overall plastic pipe is a polypropylene random copolymer pipe, perhaps refractory polyethylene pipe, perhaps polyethylene pipe, perhaps crosslinked polyethylene pipe.

6. the plastic tube of band epidermis according to claim 4 foaming layer is characterized in that, the composite pipe of described plastics and metal is the plastic-aluminum polypropylene random copolymer composite tube, perhaps plastic-aluminum atactic copolymerized polypropene stable state pipe, perhaps aluminium-plastic composite pipe.

7. the plastic tube of band epidermis according to claim 1 foaming layer is characterized in that, in use, the Placement of the plastic tube of described band epidermis foaming layer is that hot melt connects, and perhaps adopts copper pipe fitting to connect.