A multilayer composite heat-resistant pipe for desert use and preparation method thereof

Abstract

The present invention discloses a multilayer composite heat-resistant pipe for use in deserts and a preparation method thereof, comprising a plastic outer layer, a sealing rubber ring and an aluminum alloy inner layer, wherein the plastic outer layer comprises an anti-ultraviolet aging protective layer and a plastic protective layer, and a hot melt adhesive layer is provided between the aluminum alloy inner tube and the sealing rubber ring. The processing steps of the multilayer composite heat-resistant pipe for use in deserts are as follows: coating the outer surface of the aluminum alloy inner tube with hot melt adhesive, inserting the sealing rubber ring on the surface of the hot melt adhesive to extrude it for firm bonding, and then inserting the plastic outer layer along the direction of the sealing rubber ring. The multilayer composite heat-resistant pipe for use in deserts provided by the present invention has strong resistance to high and low temperatures and ultraviolet aging, is light in weight, and is easy to install.

Description

Technical Field

[0001] The invention relates to the technical field of pipes, in particular to a multilayer composite heat-resistant pipe for deserts and a preparation method thereof. Background Art

[0002] At present, PE, PPR, and PVC-U plastic drinking water pipes have been widely used in municipal engineering and urban building drinking water pipe networks due to their advantages of environmental safety, corrosion resistance, light weight, easy installation, and strong pressure bearing capacity. However, the existing PE, PPR, and PVC-U plastic drinking water pipes have many defects when used in desert areas, such as:

[0003] 1. The PPR water supply pipes in the prior art have poor resistance to low temperature and are generally installed underground in residential buildings. However, when used in desert areas, the temperature difference between day and night is large, and the lowest temperature in winter can reach below -5°C. The PPR pipes are prone to brittle cracking or bursting, so they cannot meet the requirements of the prior art.

[0004] 2. The PE water supply pipe of the prior art has good low temperature resistance and the long-term use temperature is below 60°C. When the temperature is too high, the PE pipe will deform, so it cannot meet the requirements of the prior art.

[0005] 3. The PVC-U pipes of the prior art have poor resistance to ultraviolet aging and are very susceptible to degradation, especially under high temperature and sunlight conditions, and therefore cannot meet the requirements of the prior art.

[0006] 4. The aluminum tubes in the prior art have high processing and manufacturing costs, consume natural resources, are easily corroded, and have poor thermal insulation properties, so they cannot meet the requirements of the prior art. Summary of the invention

[0007] The object of the present invention is to provide a multilayer composite heat-resistant pipe for desert use and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multi-layer composite heat-resistant pipe for desert use, comprising a plastic outer layer, a sealing rubber ring and an aluminum alloy inner tube, the plastic outer layer comprising an anti-ultraviolet aging protective layer and a plastic protective layer, a hot melt adhesive layer is provided between the aluminum alloy inner tube and the sealing rubber ring, the sealing rubber ring comprises a sealing rubber ring body and four blades, the blades are arranged in a clockwise direction, and a layer of silicone lubricant is provided on the outer surface of the blade.

[0009] Furthermore, the anti-ultraviolet aging protective layer is a highly weather-resistant ASA external anti-ultraviolet aging protective layer or an EVA external anti-ultraviolet aging protective layer.

[0010] Furthermore, the plastic protective layer is a PE plastic protective layer or a PVC-U plastic protective layer.

[0011] Furthermore, the anti-ultraviolet aging protective layer and the plastic protective layer are co-extruded by two extruders to form a plastic outer layer.

[0012] Furthermore, the sealing rubber ring is made of PVC sealing rubber ring, rubber sealing rubber ring or silicone sealing rubber ring.

[0013] Furthermore, the preparation method thereof comprises the following steps:

[0014] 1) The anti-ultraviolet aging protective layer and the plastic protective layer are co-extruded by two extruders, and then vacuum-shaped, cooled and dried to complete the extrusion of the plastic outer layer. The anti-ultraviolet aging protective layer is EVA material, and the plastic protective layer (PVC-U plastic;

[0015] 2) Extrude the sealing rubber ring, vacuum shape it, cool and dry it, then apply a layer of silicone lubricant on the outer layer of the blade of the sealing rubber ring and cool it naturally;

[0016] 3) The aluminum strip is welded into an aluminum alloy inner tube, which is a full circle;

[0017] 4) Apply hot melt adhesive on the outer wall of the aluminum alloy inner tube;

[0018] 5) Put the aluminum alloy inner tube coated with hot melt adhesive and the sealing rubber ring coated with silicone lubricant into the die cavity of the co-extrusion die head to complete the sleeve bonding of the sealant;

[0019] 6) Insert the outer plastic layer clockwise onto the outer surface of the sealing rubber ring in step 5).

[0020] Furthermore, in step 2), when the sealing rubber ring (2) is PVC-U plastic, it is made of the following components by weight percentage: 30-40 parts of polyvinyl chloride resin SG-5 type, 25-35 parts of calcium carbonate, 1-3 parts of calcium zinc stabilizer, 45-55 parts of plasticizer, 2-4 parts of lubricant, and 1-3 parts of carbon black pigment.

[0021] Furthermore, in step 1), when the plastic protective layer (12) is PVC-U plastic, it is made of the following components by weight percentage: 25-35 parts of polyvinyl chloride resin SG-5, 30-40 parts of chlorinated polyvinyl chloride resin, 15-25 parts of nano calcium carbonate, 5-9 parts of calcium zinc stabilizer, 0.05-0.15 parts of titanium dioxide, 2-4 parts of impact modifier, and 0.05-0.15 parts of lubricant.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention is provided with the anti-ultraviolet aging protective layer, which has high heat resistance and strong anti-ultraviolet aging ability, thus ensuring the service life of the product.

[0024] 2. The present invention is also provided with a plastic protective layer, which can improve the thermal insulation performance of the present invention, improve the high and low temperature resistance of the product, and reduce the risk of deformation or cracking.

[0025] 3. The present invention arranges a sealing rubber ring between the aluminum alloy inner tube and the plastic outer layer, which can not only ensure the sealing between the layers of the product, but also ensure the close connection between the inner layer and the outer layer; the organic silicon lubricant layer coated on the outer surface of the sealing rubber ring can significantly improve the wearability of the plastic outer layer.

[0026] 4. The present invention uses a special process and formula to prepare a multi-layer composite heat-resistant pipe suitable for use in deserts, which has strong resistance to high and low temperatures, UV aging, is light in weight, and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of the multi-layer composite heat-resistant pipe for desert use of the present invention;

[0028] Figure 2 It is a structural diagram of the sealing rubber ring of the present invention.

[0029] In the figure: 1. Plastic outer layer; 2. Sealing rubber ring; 3. Aluminum alloy inner tube; 4. Hot melt adhesive layer; 11. Anti-ultraviolet aging protective layer; 12. Plastic protective layer; 21. Sealing rubber ring body; 22. Blades; 23. Silicone lubricant layer. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figure 1-2The present invention provides an embodiment: a multi-layer composite heat-resistant pipe for desert use, comprising a plastic outer layer 1, a sealing rubber ring 2 and an aluminum alloy inner tube 3, wherein the plastic outer layer 1 comprises an anti-ultraviolet aging protective layer 11 and a plastic protective layer 12, and a hot melt adhesive layer 4 is provided between the aluminum alloy inner tube 3 and the sealing rubber ring 2. The anti-ultraviolet aging protective layer 11 is a highly weather-resistant ASA outer anti-ultraviolet aging protective layer 11 or an EVA outer anti-ultraviolet aging protective layer 11, and pigments can be added to give various colors. The plastic protective layer 12 is a PE plastic protective layer 12 or a PVC-U plastic protective layer 12. The anti-ultraviolet aging protective layer 11 and the plastic protective layer 12 are co-extruded by two extruders to form a plastic outer layer 1. The sealing rubber ring 2 includes a sealing rubber ring body 21 and four blades 22. The blades 22 are arranged in a clockwise direction. A layer of silicone lubricant layer 23 is provided on the outer surface of the blades 22. The sealing rubber ring 2 is made of a rubber sealing rubber ring 2 or a silicone sealing rubber ring 2. When the sealing rubber ring 2 is squeezed by an external force, the blades 22 can be tightly attached to the sealing rubber ring 2 to achieve a sealing effect.

[0033] The preparation method thereof comprises the following steps:

[0034] 1) The anti-ultraviolet aging protective layer 11 and the plastic protective layer 12 are co-extruded by two extruders, and then vacuum-formed, cooled and dried to complete the extrusion of the plastic outer layer 1. The anti-ultraviolet aging protective layer is EVA material, and the plastic protective layer 12 is PVC-U plastic;

[0035] 2) Extruding the sealing rubber ring 2, vacuum shaping, cooling and drying, and then coating the outer layer of the blade of the sealing rubber ring 2 with a layer of organic silicon lubricant 23, and cooling naturally;

[0036] 3) The aluminum strip is welded into an aluminum alloy inner tube 3, which is a full circle;

[0037] 4) Apply hot melt adhesive to the outer wall of the aluminum alloy inner tube 3;

[0038] 5) Put the aluminum alloy inner tube 3 coated with hot melt adhesive and the sealing rubber ring 2 coated with silicone lubricant into the mold cavity of the co-extrusion die head to complete the sleeve bonding of the sealing rubber ring 2;

[0039] 6) Insert the plastic outer layer 1 clockwise onto the outer surface of the sealing rubber ring 2 in step 5).

[0040] In step 2), when the sealing rubber ring 2 is PVC-U plastic, it is made of the following components by weight percentage: 30 parts of polyvinyl chloride resin SG-5, 25 parts of calcium carbonate, 1 part of calcium zinc stabilizer, 45 parts of plasticizer, 2 parts of lubricant, and 1 part of carbon black pigment.

[0041] In step 1), when the plastic protective layer 12 is PVC-U plastic, it is made of the following components by weight percentage: 25 parts of polyvinyl chloride resin SG-5, 30 parts of chlorinated polyvinyl chloride resin, 15 parts of nano calcium carbonate, 5 parts of calcium zinc stabilizer, 0.05 parts of titanium dioxide, 2 parts of impact modifier, and 0.05 parts of lubricant.

[0042] Example 2

[0043] See also Figure 1-2 The present invention provides an embodiment: a multi-layer composite heat-resistant pipe for desert use, comprising a plastic outer layer 1, a sealing rubber ring 2 and an aluminum alloy inner tube 3, wherein the plastic outer layer 1 comprises an anti-ultraviolet aging protective layer 11 and a plastic protective layer 12, and a hot melt adhesive layer 4 is provided between the aluminum alloy inner tube 3 and the sealing rubber ring 2. The anti-ultraviolet aging protective layer 11 is a highly weather-resistant ASA outer anti-ultraviolet aging protective layer 11 or an EVA outer anti-ultraviolet aging protective layer 11, and pigments can be added to give various colors. The plastic protective layer 12 is a PE plastic protective layer 12 or a PVC-U plastic protective layer 12. The anti-ultraviolet aging protective layer 11 and the plastic protective layer 12 are co-extruded by two extruders to form a plastic outer layer 1. The sealing rubber ring 2 includes a sealing rubber ring body 21 and four blades 22. The blades 22 are arranged in a clockwise direction. A layer of silicone lubricant layer 23 is provided on the outer surface of the blades 22. The sealing rubber ring 2 is made of a rubber sealing rubber ring 2 or a silicone sealing rubber ring 2. When the sealing rubber ring 2 is squeezed by an external force, the blades 22 can be tightly attached to the sealing rubber ring 2 to achieve a sealing effect.

[0044] The preparation method thereof comprises the following steps:

[0045] 1) The anti-ultraviolet aging protective layer 11 and the plastic protective layer 12 are co-extruded by two extruders, and then vacuum-formed, cooled and dried to complete the extrusion of the plastic outer layer 1. The anti-ultraviolet aging protective layer is EVA material, and the plastic protective layer 12 is PVC-U plastic;

[0046] 2) Extruding the sealing rubber ring 2, vacuum shaping, cooling and drying, and then coating the outer layer of the blade of the sealing rubber ring 2 with a layer of organic silicon lubricant 23, and cooling naturally;

[0047] 3) The aluminum strip is welded into an aluminum alloy inner tube 3, which is a full circle;

[0048] 4) Apply hot melt adhesive to the outer wall of the aluminum alloy inner tube 3;

[0049] 5) Put the aluminum alloy inner tube 3 coated with hot melt adhesive and the sealing rubber ring 2 coated with silicone lubricant into the mold cavity of the co-extrusion die head to complete the sleeve bonding of the sealing rubber ring 2;

[0050] 6) Insert the plastic outer layer 1 clockwise onto the outer surface of the sealing rubber ring 2 in step 5).

[0051] In step 2), when the sealing rubber ring is PVC-U plastic, it is made of the following components by weight percentage: 35 parts of polyvinyl chloride PVC resin SG-5 type, 30 parts of calcium carbonate, 2 parts of calcium zinc stabilizer, 50 parts of plasticizer, 3 parts of lubricant, and 2 parts of carbon black pigment.

[0052] In step 1), when the plastic protective layer 12 is PVC-U plastic, it is made of the following components by weight percentage: 30 parts of polyvinyl chloride (PVC) resin SG-5 type, 35 parts of chlorinated polyvinyl chloride resin, 20 parts of nano calcium carbonate, 7 parts of calcium zinc stabilizer, 0.1 parts of titanium dioxide, 3 parts of impact modifier, and 0.1 parts of lubricant.

[0053] Example 3

[0054] See also Figure 1-2 The present invention provides an embodiment: a multi-layer composite heat-resistant pipe for desert use, comprising a plastic outer layer 1, a sealing rubber ring 2 and an aluminum alloy inner tube 3, wherein the plastic outer layer 1 comprises an anti-ultraviolet aging protective layer 11 and a plastic protective layer 12, and a hot melt adhesive layer 4 is provided between the aluminum alloy inner tube 3 and the sealing rubber ring 2. The anti-ultraviolet aging protective layer 11 is a highly weather-resistant ASA outer anti-ultraviolet aging protective layer 11 or an EVA outer anti-ultraviolet aging protective layer 11, and pigments can be added to give various colors. The plastic protective layer 12 is a PE plastic protective layer 12 or a PVC-U plastic protective layer 12. The anti-ultraviolet aging protective layer 11 and the plastic protective layer 12 are co-extruded by two extruders to form a plastic outer layer 1. The sealing rubber ring 2 includes a sealing rubber ring body 21 and four blades 22. The blades 22 are arranged in a clockwise direction. A layer of silicone lubricant layer 23 is provided on the outer surface of the blades 22. The sealing rubber ring 2 is made of a rubber sealing rubber ring 2 or a silicone sealing rubber ring 2. When the sealing rubber ring 2 is squeezed by an external force, the blades 22 can be tightly attached to the sealing rubber ring 2 to achieve a sealing effect.

[0055] The preparation method thereof comprises the following steps:

[0056] 1) The anti-ultraviolet aging protective layer 11 and the plastic protective layer 12 are co-extruded by two extruders, and then vacuum-formed, cooled and dried to complete the extrusion of the plastic outer layer 1. The anti-ultraviolet aging protective layer is EVA material, and the plastic protective layer 12 is PVC-U plastic;

[0057] 2) Extruding the sealing rubber ring 2, vacuum shaping, cooling and drying, and then coating the outer layer of the blade of the sealing rubber ring 2 with a layer of organic silicon lubricant 23, and cooling naturally;

[0058] 3) The aluminum strip is welded into an aluminum alloy inner tube 3, which is a full circle;

[0059] 4) Apply hot melt adhesive to the outer wall of the aluminum alloy inner tube 3;

[0060] 5) Put the aluminum alloy inner tube 3 coated with hot melt adhesive and the sealing rubber ring 2 coated with silicone lubricant into the mold cavity of the co-extrusion die head to complete the sleeve bonding of the sealing rubber ring 2;

[0061] 6) Insert the plastic outer layer 1 clockwise onto the outer surface of the sealing rubber ring 2 in step 5).

[0062] In step 2), when the sealing rubber ring 2 is PVC-U plastic, it is made of the following components by weight percentage: 40 parts of polyvinyl chloride resin SG-5, 35 parts of calcium carbonate, 3 parts of calcium zinc stabilizer, 55 parts of plasticizer, 4 parts of lubricant, and 3 parts of carbon black pigment.

[0063] In step 1), when the plastic protective layer 12 is PVC-U plastic, it is made of the following components by weight percentage: 35 parts of polyvinyl chloride resin SG-5, 40 parts of chlorinated polyvinyl chloride resin, 25 parts of nano calcium carbonate, 9 parts of calcium zinc stabilizer, 0.15 parts of titanium dioxide, 4 parts of impact modifier, and 0.15 parts of lubricant.

[0064] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A multilayer composite heat-resistant pipe for use in deserts, comprising a plastic outer layer (1), a sealing rubber ring (2) and an aluminum alloy inner pipe (3), characterized in that: The plastic outer layer (1) comprises an anti-ultraviolet aging protective layer (11) and a plastic protective layer (12); a hot melt adhesive layer (4) is provided between the aluminum alloy inner tube (3) and the sealing rubber ring (2); the sealing rubber ring (2) comprises a sealing rubber ring body (21) and four blades (22); the blades (22) are arranged in a clockwise direction; a layer of organic silicon lubricant layer (23) is provided on the outer surface of the blades (22); the anti-ultraviolet aging protective layer (11) and the plastic protective layer (12) are co-extruded by two extruders to form the plastic outer layer (1); the preparation method of the multi-layer composite heat-resistant pipe for desert use comprises the following steps: 1) The anti-ultraviolet aging protective layer (11) and the plastic protective layer (12) are co-extruded by two extruders, and then vacuum-shaped, cooled and dried to complete the extrusion of the plastic outer layer (1); the anti-ultraviolet aging protective layer is EVA material, and the plastic protective layer (12) is PVC-U plastic, which is made of the following components in weight percentage: 25-35 parts of polyvinyl chloride resin SG-5, 30-40 parts of chlorinated polyvinyl chloride resin, 15-25 parts of nano calcium carbonate, 5-9 parts of calcium zinc stabilizer, 0.05-0.15 parts of titanium dioxide, 2-4 parts of impact modifier, and 0.05-0.15 parts of lubricant; 2) Extruding the sealing rubber ring (2), vacuum shaping, cooling and drying, and then coating the outer layer of the blade of the sealing rubber ring (2) with a layer of organic silicon lubricant (23), and cooling naturally. The sealing rubber ring (2) is PVC-U plastic, and is made of the following components by weight percentage: 30-40 parts of polyvinyl chloride resin SG-5 type, 25-35 parts of calcium carbonate, 1-3 parts of calcium zinc stabilizer, 45-55 parts of plasticizer, 2-4 parts of lubricant, and 1-3 parts of carbon black pigment; 3) The aluminum strip is welded into an aluminum alloy inner tube (3) to form a full circle; 4) applying hot melt adhesive to the outer wall of the aluminum alloy inner tube (3); 5) placing the aluminum alloy inner tube (3) coated with hot melt adhesive and the sealing rubber ring (2) coated with silicone lubricant into the mold cavity of the co-extrusion die head to complete the sleeve bonding of the sealing rubber ring (2); 6) Insert the plastic outer layer (1) clockwise onto the outer surface of the sealing rubber ring (2) in step 5).

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