PE mesh steel belt spiral winding pipe and preparation method thereof

Abstract

The invention discloses a PE mesh steel belt spiral winding pipe and a preparation method thereof, and belongs to the technical field of winding pipes, the PE mesh steel belt spiral winding pipe comprises the following raw materials by weight: 91 parts of a polyethylene pipeline material, 5 parts of a polyethylene octylene copolymer, 10-15 parts of a functional component, 1 part of an antioxidant, and 0.5 part of a lubricant; the mesh steel belt is adopted to replace a traditional non-porous steel belt, on one hand, raw materials are saved, the production cost is reduced, on the other hand, the contact area of the steel belt and the polyethylene composite material is increased, the bonding strength of the steel belt and the polyethylene composite material is improved, and it is guaranteed that the PE mesh steel belt spiral winding pipe has the good mechanical property; the mechanical property, the aging resistance and the flame retardant property of the PE mesh steel belt spiral winding pipe are favorably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wound pipes, and in particular relates to a PE mesh steel belt spirally wound pipe and a preparation method thereof. Background Art

[0002] PE steel belt spirally wrapped pipe forms a composite structure by spirally embedding steel belt into polyethylene (PE) material, which greatly improves the rigidity and strength of the pipe. The high rigidity and high strength of the steel belt combined with the corrosion resistance and wear resistance of the PE material make the pipe perform well in terms of bearing external pressure, soil load and groundwater pressure. According to professional data, the ring stiffness of this pipe can reach multiple levels such as SN8, SN12.5, SN16, etc., which is especially suitable for the needs of large-diameter pipes, ensuring the stability and safety of the pipeline system.

[0003] For example, Chinese patent CN104534192 discloses a high-rigidity steel belt reinforced polyethylene threaded pipe and a preparation method thereof, which includes a polyethylene inner tube, a formed steel belt and a polyethylene outer tube. The formed steel belt is wrapped around the outer surface of the polyethylene inner tube, and the formed steel belt is coated with the polyethylene outer tube. Due to the huge difference in properties between organic materials and inorganic materials, the bonding between the steel belt and the polyethylene inner tube and the polyethylene outer tube is poor, which ultimately leads to poor mechanical properties of the pipe. Summary of the invention

[0004] The purpose of the present invention is to provide a PE mesh steel belt spirally wound pipe and a preparation method thereof, so as to solve the problem of poor mechanical properties of the PE steel belt spirally wound pipe in the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A PE mesh steel belt spirally wound pipe, comprising the following raw materials in parts by weight:

[0007] 91 parts of polyethylene pipe material, 5 parts of polyethylene octene copolymer, 10-15 parts of functional components, 1 part of antioxidant, and 0.5 part of lubricant.

[0008] Further, the functional component is prepared by the following steps:

[0009] Mix epoxy PEG thiol, 2-aminoethylphosphonic acid and DMF evenly, stir and react at 40-60°C for 3-4 hours, then add 2-hydroxy-4-acryloxybenzophenone and azobisisobutyronitrile, heat to 65°C, stir and react for 2-3 hours. After the reaction is completed, remove DMF by vacuum distillation to obtain functional components.

[0010] Further, the molar ratio of epoxy PEG thiol, 2-aminoethylphosphonic acid and 2-hydroxy-4-acryloxybenzophenone is 1:1:1.

[0011] Furthermore, the amount of DMF used is 8-15 times the mass of the epoxy PEG thiol group.

[0012] Furthermore, the amount of azobisisobutyronitrile is 2% of the amount of 2-hydroxy-4-acryloxybenzophenone.

[0013] Furthermore, the molecular weight of epoxy PEG thiol is 400-600 and is purchased from Xi'an Kaixin Technology Co., Ltd.

[0014] Furthermore, the polyethylene pipe material is 100 grade polyethylene pipe material, with a melt mass flow rate of 0.15-0.45 g / 10 min, industrial grade, model PN049-030-122, purchased from SABIC (Tianjin) Petrochemical Co., Ltd.

[0015] Furthermore, the melt mass flow rate of the polyethylene octene copolymer is 1.1 g / 10 min, and the model is LC 170, industrial grade.

[0016] Further, the antioxidant is at least one of antioxidant 1010 , antioxidant 168 , antioxidant 330 and antioxidant 1076 .

[0017] Furthermore, the lubricant is at least one of zinc stearate, calcium stearate and polyethylene wax.

[0018] The method for preparing the PE mesh steel belt spirally wound pipe comprises the following steps:

[0019] S1, adding polyethylene pipe material, polyethylene octene copolymer, functional components, antioxidant and lubricant into a mixer, mixing at a speed of 200-500 r / min for 20 min, then transferring to a twin-screw extruder, melt-extruding and granulating to obtain a masterbatch;

[0020] S2. The masterbatch is fed into the extruder, and the mesh steel belt is added into the extrusion die. Through the extrusion process, the mesh steel belt is completely covered in the composite material formed by extrusion of the masterbatch. The extrusion temperature is 160-180°C to obtain a plate with a thickness of 10-20 mm, which is then wound to obtain a PE mesh steel belt spirally wound tube.

[0021] Furthermore, in the twin-screw extruder, the temperature of zone 1 is 130-140°C, the temperature of zone 2 is 170-180°C, the temperature of zone 3 is 180-190°C, the temperature of zone 4 is 175-185°C, and the temperature of the die head is 180-190°C.

[0022] Furthermore, the mesh steel belt has a thickness of 6.0-18 mm.

[0023] Furthermore, the inner diameter of the PE mesh steel belt spirally wound pipe is 300-3000mm.

[0024] Beneficial effects of the present invention:

[0025] 1. The present invention provides a PE mesh steel belt spirally wound pipe, which adopts a mesh steel belt to replace the traditional non-porous steel belt. On the one hand, it saves raw materials and reduces production costs. On the other hand, it increases the contact area between the steel belt and the polyethylene composite material, improves the bonding strength between the two, and ensures that the PE mesh steel belt spirally wound pipe has good mechanical properties.

[0026] 2. The present invention introduces a functional component into the masterbatch, and the functional component is prepared from epoxy PEG thiol, 2-aminoethylphosphonic acid and 2-hydroxy-4-acryloxybenzophenone. The reaction mechanism includes a ring-opening reaction between the amino group and the epoxy group, and a thiol-ene click reaction. When it is applied to the winding tube, the introduction of the flexible long chain of polyethylene glycol (PEG) and the rigid ring of benzophenone can play a reinforcing and toughening role, which is beneficial to improving the mechanical properties of the winding tube; in addition, the benzophenone structure has the function of absorbing ultraviolet rays, and the formation of thioether bonds during the reaction process further enhances the absorption of ultraviolet rays, significantly improving the light aging resistance of the winding tube, and the introduction of the phosphate group, on the one hand, through the good coordination relationship with the metal ions, improves the bonding between the polymer matrix and the steel plate, further improves the mechanical properties of the winding tube, and on the other hand, forms a flame retardant system of nitrogen, phosphorus and sulfur, and improves the flame retardant properties of the winding tube. DETAILED DESCRIPTION

[0027] The following will be combined with 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.

[0028] The polyethylene pipe material in this application is 100 grade polyethylene pipe material, with a melt mass flow rate of 0.15-0.45 g / 10 min, industrial grade, model PN049-030-122, purchased from China SABIC (Tianjin) Petrochemical Co., Ltd., and the melt mass flow rate of polyethylene octene copolymer is 1.1 g / 10 min, model LC 170, industrial grade.

[0029] Preparation Example 1

[0030] The functional components are prepared by the following steps:

[0031] 0.1 mol epoxy PEG thiol, 0.1 mol 2-aminoethylphosphonic acid and 3.2 L DMF were mixed evenly, stirred and reacted at 40 ° C for 4 hours, then 0.1 mol 2-hydroxy-4-acryloxybenzophenone and 0.328 g azobisisobutyronitrile were added, the temperature was raised to 65 ° C, and the reaction was stirred for 2 hours. After the reaction was completed, DMF was removed by reduced pressure distillation to obtain functional components.

[0032] The molecular weight of epoxy PEG thiol was 400 and was purchased from Xi'an Kaixin Technology Co., Ltd.

[0033] Preparation Example 2

[0034] The functional components are prepared by the following steps:

[0035] 0.1 mol epoxy PEG thiol, 0.1 mol 2-aminoethylphosphonic acid and 9 L DMF were mixed evenly, stirred and reacted at 60 ° C for 4 h, then 0.1 mol 2-hydroxy-4-acryloxybenzophenone and 0.328 g azobisisobutyronitrile were added, the temperature was raised to 65 ° C, and the reaction was stirred for 3 h. After the reaction was completed, DMF was removed by reduced pressure distillation to obtain functional components.

[0036] The molecular weight of epoxy PEG thiol was 600 and was purchased from Xi'an Kaixin Technology Co., Ltd.

[0037] Comparative Example 1

[0038] The functional components are prepared by the following steps:

[0039] 0.1 mol epoxy PEG thiol, 0.1 mol 2-aminoethylphosphonic acid and 9 L DMF were mixed evenly, stirred at 60°C for 4 h, and after the reaction was completed, DMF was removed by vacuum distillation to obtain functional components.

[0040] The molecular weight of epoxy PEG thiol is 600 and was purchased from Xi'an Kaixin Technology Co., Ltd.

[0041] Comparative Example 2

[0042] The functional components are prepared by the following steps:

[0043] 0.1 mol epoxy PEG thiol and 3.2 L DMF were mixed evenly, and then 0.1 mol 2-hydroxy-4-acryloxybenzophenone and 0.328 g azobisisobutyronitrile were added, the temperature was raised to 65°C, and the reaction was stirred for 2 h. After the reaction was completed, DMF was removed by vacuum distillation to obtain the functional component.

[0044] The molecular weight of epoxy PEG thiol was 400 and was purchased from Xi'an Kaixin Technology Co., Ltd.

[0045] Example 1

[0046] A PE mesh steel belt spirally wound pipe, comprising the following raw materials in parts by weight:

[0047] 91 parts of polyethylene pipe material, 5 parts of polyethylene octene copolymer, 10 parts of the functional component of Preparation Example 1, 10101 parts of antioxidant, and 0.5 parts of zinc stearate.

[0048] The method for preparing the PE mesh steel belt spirally wound pipe comprises the following steps:

[0049] S1. Add polyethylene pipe material, polyethylene octene copolymer, functional component, antioxidant 1010 and zinc stearate into a mixer, mix at 200 r / min for 20 min, and then transfer to a twin-screw extruder, melt-extrude and granulate to obtain masterbatch. The temperature of the first zone of the twin-screw extruder is 130° C., the temperature of the second zone is 170° C., the temperature of the third zone is 180° C., the temperature of the fourth zone is 180° C., and the temperature of the die head is 185° C.;

[0050] S2. The masterbatch is fed into the extruder, and the mesh steel belt is added into the extrusion die. Through the extrusion process, the mesh steel belt is completely covered in the composite material formed by extrusion of the masterbatch. The extrusion temperature is 160°C to obtain a plate with a thickness of 20 mm, which is then wound to obtain a PE mesh steel belt spiral winding tube with an inner diameter of 600 mm.

[0051] The thickness of the mesh steel belt is 18mm.

[0052] Example 2

[0053] A PE mesh steel belt spirally wound pipe, comprising the following raw materials in parts by weight:

[0054] 91 parts of polyethylene pipe material, 5 parts of polyethylene octene copolymer, 12 parts of the functional component of Preparation Example 2, 1681 parts of antioxidant, and 0.5 parts of calcium stearate.

[0055] The method for preparing the PE mesh steel belt spirally wound pipe comprises the following steps:

[0056] S1, adding polyethylene pipe material, polyethylene octene copolymer, functional component, antioxidant 168 and calcium stearate into a mixer, mixing at a speed of 400r / min for 20min, then transferring to a twin-screw extruder, melt extruding and granulating to obtain masterbatch, the temperature of the first zone of the twin-screw extruder is 135°C, the temperature of the second zone is 175°C, the temperature of the third zone is 185°C, the temperature of the fourth zone is 180°C, and the temperature of the die head is 185°C;

[0057] S2. The masterbatch is fed into the extruder, and the mesh steel belt is added into the extrusion die. Through the extrusion process, the mesh steel belt is completely covered in the composite material formed by extrusion of the masterbatch. The extrusion temperature is 170°C to obtain a plate with a thickness of 20 mm, which is then wound to obtain a PE mesh steel belt spiral winding tube with an inner diameter of 600 mm.

[0058] The thickness of the mesh steel belt is 18mm.

[0059] Example 3

[0060] A PE mesh steel belt spirally wound pipe, comprising the following raw materials in parts by weight:

[0061] 91 parts of polyethylene pipe material, 5 parts of polyethylene octene copolymer, 15 parts of the functional component of Preparation Example 2, 1681 parts of antioxidant, and 0.5 parts of calcium stearate.

[0062] The method for preparing the PE mesh steel belt spirally wound pipe comprises the following steps:

[0063] S1. Add polyethylene pipe material, polyethylene octene copolymer, functional component, antioxidant 168 and calcium stearate into a mixer, mix at 500 r / min for 20 min, and then transfer to a twin-screw extruder, melt-extrude and granulate to obtain masterbatch. The temperature of the first zone of the twin-screw extruder is 140° C., the temperature of the second zone is 180° C., the temperature of the third zone is 190° C., the temperature of the fourth zone is 185° C., and the temperature of the die head is 190° C.;

[0064] S2. The masterbatch is fed into the extruder, and the mesh steel belt is added into the extrusion die. Through the extrusion process, the mesh steel belt is completely covered in the composite material formed by extrusion of the masterbatch. The extrusion temperature is 160-180°C to obtain a plate with a thickness of 20 mm, which is then wound to obtain a PE mesh steel belt spiral winding tube with an inner diameter of 600 mm.

[0065] The thickness of the mesh steel belt is 18mm.

[0066] Comparative Example 1

[0067] A PE mesh steel belt spirally wound pipe. Compared with Example 1, the functional components in Example 1 are replaced by a mixture of epoxy PEG mercapto, 2-aminoethylphosphonic acid and 2-hydroxy-4-acryloxybenzophenone in a molar ratio of 1:1:1, and the remaining raw materials, parameters and preparation process are the same as those in Example 1.

[0068] Comparative Example 2

[0069] A PE mesh steel belt spirally wound pipe, compared with Example 1, the functional components in Example 1 are replaced with the product prepared in Control Example 1, and the remaining raw materials, parameters and preparation process are the same as Example 1.

[0070] Comparative Example 3

[0071] A PE mesh steel strip spirally wound pipe. Compared with Example 1, the functional components in Example 1 are replaced with the product prepared in Control Example 2, and the remaining raw materials, parameters and preparation process are the same as Example 1.

[0072] Comparative Example 4

[0073] A PE mesh steel belt spirally wound pipe, compared with Example 1, the functional component in Example 1 is replaced by polyethylene glycol (molecular weight of 400), and the other raw materials, parameters and preparation process are the same as Example 1.

[0074] The masterbatch obtained in the preparation process of the PE mesh steel belt spirally wound pipe described in Examples 1 to 3 and Comparative Examples 1 to 4 was pressed into a 4 mm thick sample at 200°C. According to the UV aging resistance method in Appendix J of GB / T23257-2017, 60°C, 8 h of ultraviolet fluorescence irradiation and 50°C, 4 h of condensation exposure were alternately cycled, and the irradiance was 0.89 W / (m 2 ·nm), and then aged for 336h. The tensile strength and elongation at break of the samples before and after aging were tested. The flame retardant grade was tested by the vertical and horizontal combustion tester: PX-03-01. The test results are shown in Table 1:

[0075] Table 1

[0076]

[0077]

[0078] It can be seen from Table 1 that, compared with Comparative Examples 1 to 4, the samples prepared with the masterbatch described in Examples 1 to 3 have better mechanical properties, flame retardant properties and aging resistance.

[0079] The ring stiffness test of the PE mesh steel belt spirally wound pipes described in Examples 1 to 3 and Comparative Examples 1 to 4 was carried out in accordance with GB / T9647-2003. The test results are shown in Table 2:

[0080] Table 2

[0081]

[0082] It can be seen from Table 2 that compared with Comparative Examples 1 to 4, the PE mesh steel belt spirally wound pipes described in Examples 1 to 3 have higher mechanical properties.

[0083] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0084] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PE mesh steel belt spirally wound pipe, characterized in that: It includes the following raw materials in parts by weight: 91 parts of polyethylene pipe material, 5 parts of polyethylene octene copolymer, 10-15 parts of functional components, 1 part of antioxidant, and 0.5 part of lubricant.

2. A PE mesh steel belt spirally wound pipe according to claim 1, characterized in that: The functional components are prepared by the following steps: Mix epoxy PEG thiol, 2-aminoethylphosphonic acid and DMF, stir and react at 40-60°C for 3-4 hours, then add 2-hydroxy-4-acryloxybenzophenone and azobisisobutyronitrile, heat to 65°C, stir and react for 2-3 hours. After the reaction is completed, remove DMF by vacuum distillation to obtain functional components.

3. The PE mesh steel belt spirally wound pipe according to claim 2, characterized in that: The molar ratio of epoxy PEG thiol, 2-aminoethylphosphonic acid and 2-hydroxy-4-acryloxybenzophenone is 1:1:

1.

4. The PE mesh steel belt spirally wound pipe according to claim 2, characterized in that: The amount of azobisisobutyronitrile used is 2% of the amount of 2-hydroxy-4-acryloyloxybenzophenone substance.

5. The PE mesh steel belt spirally wound pipe according to claim 2, characterized in that: The molecular weight of epoxy PEG thiol is 400-600.

6. The PE mesh steel belt spirally wound pipe according to claim 1, characterized in that: The polyethylene pipe material is 100 grade polyethylene pipe material with a melt mass flow rate of 0.15-0.45 g / 10 min.

7. The PE mesh steel belt spirally wound pipe according to claim 1, characterized in that: The melt mass flow rate of the polyethylene octene copolymer was 1.1 g / 10 min.

8. A method for preparing a PE mesh steel strip spirally wound pipe as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1, adding polyethylene pipe material, polyethylene octene copolymer, functional components, antioxidant and lubricant into a mixer, mixing for 20 minutes, then transferring to a twin-screw extruder, melt extruding and granulating to obtain a masterbatch; S2. The masterbatch is fed into the extruder, and the mesh steel belt is added into the extrusion die. Through the extrusion process, the mesh steel belt is completely covered in the composite material formed by extrusion of the masterbatch. The extrusion temperature is 160-180°C to obtain a plate with a thickness of 10-20 mm, which is then wound to obtain a PE mesh steel belt spirally wound tube.

9. The method for preparing a PE mesh steel belt spirally wound pipe according to claim 8, characterized in that: The thickness of the mesh steel belt is 6.0-18mm.

10. The method for preparing a PE mesh steel belt spirally wound pipe according to claim 8, characterized in that: The inner diameter of the PE mesh steel belt spirally wound pipe is 300-3000mm.

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