Heat-resistant aluminum-plastic composite pipe

Abstract

The application provides a heat-resistant aluminum-plastic composite pipe, which comprises an inner plastic layer, an inner adhesive resin layer, a metal aluminum layer, a heat insulation layer and an outer plastic layer. The heat insulation layer is arranged between the metal aluminum layer and the outer plastic layer, inorganic filler hollow glass microbeads and aerogel felt are used as the heat insulation and heat preservation materials, and a heat insulation support body is used to control the dimensional stability of the pipe, so that the use temperature of the aluminum-plastic composite pipe is improved, and the application field of the aluminum-plastic composite pipe is widened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum-plastic composite pipe, in particular to a heat-resistant aluminum-plastic composite pipe. BACKGROUND

[0002] The aluminum-plastic composite pipe is a multi-layer composite pipe with aluminum sandwiched between random copolymer polypropylene (PP-R) or high-density polyethylene (HDPE), and its specific structure is inner and outer plastic layers, a middle aluminum layer, and an adhesive resin layer connecting the aluminum layer and the inner and outer plastic layers. The inner and outer plastic layers have the characteristics of green environmental protection, good low-temperature resistance, good impact resistance, corrosion resistance, etc., and the middle aluminum layer endows the pipe with high pressure resistance and greatly reduces the bending degree during pipe laying. Therefore, the aluminum-plastic composite pipe has been widely used in various water supply pipeline laying projects since its development.

[0003] If it is a high-density polyethylene aluminum-plastic composite pipe, since the high-density polyethylene material is not suitable for transporting fluids above 45℃, such pipe material is not suitable for hot water pipelines. For random copolymer polypropylene aluminum-plastic composite pipe, although the thermal conductivity of PP-R is small, it can only be used for a long time below 0℃-70℃, but in some industries that need to transport fluids at higher temperatures, the use of such pipe material is limited, and the safety problem of the outer plastic layer and the heat loss problem of the fluid in the pipe due to the good thermal conductivity of the middle aluminum layer need to be solved. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present application is how to improve the use temperature and heat insulation of the aluminum-plastic composite pipe for transporting fluids.

[0005] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows: a heat-resistant aluminum-plastic composite pipe, comprising an inner plastic layer, an inner adhesive resin layer, a metal aluminum layer, a heat insulation layer, and an outer plastic layer. The heat-resistant aluminum-plastic composite pipe is in the shape of a hollow multi-layer composite pipe body, the innermost layer is the inner plastic layer, the inner adhesive resin layer is located outside the inner plastic layer, the metal aluminum layer is located outside the inner adhesive resin layer, the heat insulation layer is located outside the metal aluminum layer, and the outer plastic layer is located outside the heat insulation layer.

[0006] The material of the inner plastic layer is polyvinylidene fluoride.

[0007] The material of the inner adhesive resin layer is maleic anhydride grafted polyethylene.

[0008] The material of the metal aluminum layer is aluminum-manganese alloy or aluminum-copper alloy.

[0009] The material of the outer plastic layer is random copolymer polypropylene.

[0010] The heat insulation layer comprises a heat insulation support body, a filling layer and a heat preservation layer, the heat insulation support body is composed of an aluminum-copper hollow pipe body and a PP-R plastic profile, and the aluminum-copper hollow pipe body and the PP-R plastic profile are bonded through a maleic anhydride grafted polyethylene layer.

[0011] Further, the filling layer is a 5:1 mixture of hollow glass beads and PP-R.

[0012] Further, the heat preservation layer is aerogel felt.

[0013] Further, the heat insulation support body has four, which are evenly distributed in the heat insulation layer.

[0014] Further, the thickness of the heat insulation support body is equal to the sum of the thicknesses of the filling layer and the heat preservation layer.

[0015] Further, the thickness ratio of the aluminum-copper hollow pipe and the PP-R plastic profile is 1:(1-1.5).

[0016] Further, the thickness ratio of the filling layer and the heat preservation layer is (2-3):1.

[0017] Further, the PP-R plastic profile and the outer plastic layer are integrally formed.

[0018] Further, the curvature of the inner arc of the heat insulation support body is 0.08 rad-0.2 rad, and is completely matched with the outer surface of the metal aluminum layer.

[0019] The beneficial effects of the present application are that by setting the heat insulation layer between the metal aluminum layer and the outer plastic layer, the double-layer heat insulation design of the heat insulation layer is carried out by taking advantage of the low thermal conductivity of the hollow glass beads and the aerogel felt, the tendency of the heat of the fluid in the pipe to diffuse outward is effectively reduced, and the displacement of the metal pipe caused by the softening of the adhesive resin layer and the unstable size of the filling layer when the pipe body transports high-temperature fluid is avoided by designing the heat insulation support body in the heat insulation layer, thereby improving the use safety of the composite pipe. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a sectional view of a heat-resistant aluminum-plastic composite pipe.

[0021] Figure 2 It is a sectional view of a heat insulation support body.

[0022] The drawing label: 1 inner plastic layer; 2 inner adhesive resin layer; 3 metal aluminum layer; 4 heat insulation layer; 5 outer plastic layer; 6 heat insulation support body; filling layer 7; heat preservation layer 8; 61 PP-R plastic profile; 62 maleic anhydride grafted polyethylene layer; 63 aluminum-copper hollow pipe body; 64 heat insulation support body inner arc; 65 hollow structure. DETAILED DESCRIPTION

[0023] In order to further illustrate the technical points of the present application, the following content is described in combination with the drawings, further illustrating the present application.

[0024] Embodiment

[0025] A heat-resistant aluminum-plastic composite pipe comprises an inner plastic layer 1, an inner adhesive resin layer 2, a metal aluminum layer 3, a heat insulation layer 4 and an outer plastic layer 5. The heat-resistant aluminum-plastic composite pipe is in the shape of a hollow multi-layer composite pipe body, the innermost layer is the inner plastic layer 1, the inner adhesive resin layer 2 is located outside the inner plastic layer 1, the metal aluminum layer 3 is located outside the inner adhesive resin layer 2, the heat insulation layer 4 is located outside the metal aluminum layer 3, and the outer plastic layer 5 is located outside the heat insulation layer 4.

[0026] The material of the inner plastic layer 1 is polyvinylidene fluoride (PVDF), and the maximum long-term use temperature of polyvinylidene fluoride can reach 110-150℃, which can greatly improve the temperature of the pipe conveying liquid.

[0027] The material of the inner adhesive resin layer 2 is maleic anhydride grafted polyethylene.

[0028] The material of the metal aluminum layer 3 is aluminum-copper alloy.

[0029] The material of the outer plastic layer 5 is random copolymer polypropylene (PP-R), and the setting of the PP-R outer plastic layer has two advantages: first, the thermal conductivity of PP-R material is much lower than that of PE material, which has a certain heat insulation effect; second, it can be perfectly welded with PP-R pipe fittings during welding.

[0030] The heat insulation layer 4 comprises a heat insulation support body 6, a filling layer 7 and a heat preservation layer 8, the heat insulation support body 6 is composed of a special-shaped aluminum-copper hollow pipe body 63 and a PP-R plastic profile 61, and the special-shaped aluminum-copper hollow pipe body 63 and the PP-R plastic profile 61 are bonded by a maleic anhydride grafted polyethylene layer 62.

[0031] The heat insulation support body 6 can fix the metal aluminum layer 3 in a certain position by using its rigidity and the dimensional stability of the outer plastic layer 5, avoiding the small displacement between the pipe layers caused by the high temperature of the fluid conveyed in the pipe, and improving the dimensional stability and safety of the pipe material; the special-shaped aluminum-copper hollow pipe body 63 has a hollow structure 65, which has the advantages of reducing material cost and high compression resistance due to large inertia moment.

[0032] Further, the filling layer 7 is a 5:1 mixture of hollow glass beads and PP-R, which has the advantages of melting the PP-R in the filling layer to achieve sealing during pipe welding, and the hollow glass beads are light in weight, stable in composition and low in price, which is beneficial to cost reduction.

[0033] Further, the heat preservation layer 8 is aerogel felt, which is an inorganic fiber composite and has low thermal conductivity.

[0034] Further, the heat insulation support 6 is four in number and is uniformly distributed in the heat insulation layer.

[0035] Further, the thickness of the heat insulation support 6 is equal to the sum of the thicknesses of the filling layer 7 and the heat preservation layer 8.

[0036] Further, the thickness ratio of the special-shaped aluminum-copper hollow pipe 63 and the PP-R plastic profile 61 is 1:1.

[0037] Further, the thickness ratio of the filling layer 7 and the heat preservation layer 8 is 3:1, and under the condition of meeting certain heat insulation performance, the filling layer has a large thickness ratio, which can reduce the weight and cost of the pipe body.

[0038] Further, the PP-R plastic profile 61 and the outer plastic layer 5 are integrally formed.

[0039] Further, the curvature of the inner arc 64 of the heat insulation support is 0.08 rad, and the inner arc 64 is completely attached to the outer surface of the metal aluminum layer.

[0040] In the embodiment, the heat-resistant aluminum-plastic composite pipe can be easily connected with other pipes by the pipe fitting socket welding method, and the fusion effect is good.

[0041] The above embodiments describe the main features and advantages of the present application, and those skilled in the art should understand that the present application is not limited to the above embodiments, and equivalent transformations made without departing from the spirit and scope of the present application are also within the protection scope of the present application.

Claims

1. A heat-resistant aluminum-plastic composite pipe, characterized by comprising: The heat-resistant aluminum-plastic composite pipe comprises an inner plastic layer, an inner adhesive resin layer, a metal aluminum layer, a heat insulation layer and an outer plastic layer; the heat-resistant aluminum-plastic composite pipe is in the shape of a hollow multi-layer composite pipe body, the innermost layer is the inner plastic layer, the inner adhesive resin layer is located outside the inner plastic layer, the metal aluminum layer is located outside the inner adhesive resin layer, the heat insulation layer is located outside the metal aluminum layer, and the outer plastic layer is located outside the heat insulation layer; The material of the inner plastic layer is polyvinylidene fluoride; The material of the inner adhesive resin layer is maleic anhydride grafted polyethylene; The material of the metal aluminum layer is aluminum-manganese alloy or aluminum-copper alloy; The material of the outer plastic layer is random copolymerized polypropylene; The heat insulation layer comprises a heat insulation support body, a filling layer and a heat preservation layer; the heat insulation support body is composed of an aluminum-copper hollow pipe body and a PP-R plastic profile, and the aluminum-copper hollow pipe body and the PP-R plastic profile are bonded by a maleic anhydride grafted polyethylene layer.

2. The heat-resistant aluminum-plastic composite pipe according to claim 1, characterized by The filling layer is a 5:1 mixture of hollow glass beads and PP-R.

3. The heat-resistant aluminum-plastic composite pipe according to claim 1, characterized by The heat preservation layer is aerogel felt.

4. The heat-resistant aluminum-plastic composite pipe according to claim 1, characterized by The heat insulation support body has four heat insulation support bodies, which are evenly distributed in the heat insulation layer.

5. The heat-resistant aluminum-plastic composite pipe according to claim 1, characterized by The thickness of the heat insulation support body is equal to the sum of the thicknesses of the filling layer and the heat preservation layer.

6. The heat-resistant aluminum-plastic composite pipe according to claim 1, wherein The thickness ratio of the aluminum-copper hollow pipe body to the PP-R plastic profile is 1:(1-1.5).

7. The heat-resistant aluminum-plastic composite pipe according to claim 1, wherein The thickness ratio of the filling layer to the heat preservation layer is (2-3):

1.

8. The heat resistant aluminum-plastic composite pipe according to claim 1, characterized in that, The PP-R plastic profile and the outer plastic layer are integrally formed.

9. The heat resistant aluminum-plastic composite pipe according to claim 1, wherein The inner arc of the heat insulation support body has a curvature of 0.08 rad-0.2 rad and is completely attached to the outer surface of the metal aluminum layer.

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