3LPP pipeline anticorrosive coating repair material and preparation method

Abstract

The application provides a 3LPP pipeline anticorrosive coating repair material and a preparation method thereof, and the preparation method comprises the following steps: uniformly mixing raw materials of a repair material substrate, extruding and granulating to obtain repair material substrate granules; the repair material substrate comprises the following components and their mass percentages are as follows: 55-65% of metallocene polypropylene, 10-20% of metallocene polyethylene, 12-18% of a terpolymer of ethylene-propylene grafted maleic anhydride, 3-5% of polyether ether ketone, 1-3% of nano organic montmorillonite, 1-2% of a sensitizer, 1-2% of an antioxidant and 1-2% of a color masterbatch; after the granules are dried, the granules are extruded into repair material sheets, the repair material sheets are crosslinked through radiation to obtain repair material substrate, and polypropylene hot melt adhesive is coated to obtain the repair material. The 3LPP pipeline anticorrosive coating repair material can be directly installed through flame baking, the repair cost and difficulty of the 3LPP pipeline are reduced, and the construction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas pipeline anticorrosion, and particularly relates to a 3LPP pipeline anticorrosion layer repair material and a preparation method. BACKGROUND

[0002] The new anticorrosion structure, 3-layer polyethylene (3LPE), is still the most important anticorrosion structure in pipeline construction. Since the Vicat softening temperature of PE is relatively low (about 90 DEG C), the 3LPE coating will soften when the temperature is greater than 80 DEG C, and the mechanical strength becomes very poor, so the 3LPE coating cannot be used for anticorrosion and heat preservation of oil and gas pipelines with high operating temperature and high soil stress requirement. Polypropylene has a high Vicat softening temperature (above 135 DEG C), high insulation strength, high temperature resistance and other advantages, and is particularly suitable for outer wall anticorrosion of long-distance crude oil and product oil pipelines. The 3-layer polypropylene (3LPP) coating has been widely used in oil and gas pipeline projects and offshore crude oil transportation projects. Similar to the 3LPE pipeline, the 3LPP pipeline also needs to be repaired and repaired at the construction site during laying. Since PP is a non-polar material and has poor compatibility with PE, the traditional PE repair and repair material cannot be applied to the 3LPP pipeline, and PP heat shrinkable tape and PP repair and repair material capable of forming good adhesion with PP need to be developed.

[0003] During construction, the 3LPP layer will inevitably be damaged, and the damage of the 3LPP anticorrosion layer of the pipeline itself allows on-site repair. The anticorrosion repair process is determined according to the damage degree and the damage area. According to the damage degree, the 3LPP damage can be divided into two types: bare metal or primer and outer skin slight damage, and then the repair material and repair process are selected according to the size of the damage area. According to the standard requirements, when the damage area is greater than 50 cm 2 , PP heat shrinkable tape is needed to be installed for overall wrapping for anticorrosion layer repair; when the damage area is less than or equal to 50 cm 2 , patch type PP repair and repair material is used for repair with PP hot melt adhesive.

[0004] Since no manufacturer has developed a patch type repair material for 3LPP pipeline repair and repair, PP anticorrosion layer defects can only be repaired by using PP heat shrinkable tape for overall wrapping. Since the melting point of PP hot melt adhesive is usually above 140 DEG C, the temperature needs to be baked to above 180 DEG C during installation of the PP heat shrinkable tape, so that the heat shrinkable tape and the anticorrosion layer form good adhesion. And since PP is prone to high-temperature degradation, the PP substrate is prone to oil degradation when directly using a liquefied gas spray torch to bake for more than 15 minutes. There are also medium frequency heating devices to reduce the open flame baking time.

[0005] However, using PP heat shrink tape for repair, there are still the following problems: first, the price of PP heat shrink tape is expensive, and all defects need to be repaired with heat shrink tape, which will greatly increase the cost of pipeline construction; second, in order to repair small defects, a complete set of heat shrink tape is used, causing material and energy waste; third, PP heat shrink tape installation basically needs to use medium frequency equipment, otherwise the heating temperature is difficult to reach, but the medium frequency equipment must be equipped with large lifting equipment and large power generation equipment, the installation operation is difficult, the demand for professional personnel is large, and the pipeline construction investment is large.

[0006] Therefore, it is necessary to develop a 3LPP pipeline anticorrosive coating repair material which can be directly flame baked and installed, to reduce the repair cost and difficulty of 3LPP pipeline, and to improve the construction efficiency. SUMMARY

[0007] In view of the above technical problems, the present application discloses a 3LPP pipeline anticorrosive coating repair material and a preparation method, which can be directly flame baked and installed, to reduce the repair cost and difficulty of 3LPP pipeline, and to improve the construction efficiency.

[0008] To this end, the technical scheme adopted by the present application is as follows:

[0009] A preparation method of a 3LPP pipeline anticorrosive coating repair material, comprising the following steps:

[0010] Step S1, uniformly mix the repair material base material raw materials, extrude and granulate to obtain repair material base material granules; wherein the repair material base material contains the following components and their mass percentages:

[0011] Metallocene polypropylene (mPP) 55-65%, metallocene polyethylene (mPE) 10%-20%, ternary ethylene-propylene copolymer grafted maleic anhydride 12%-18%, polyether ether ketone (PEEK) 3%-5%, nano-organic montmorillonite 1%-3%, sensitizer 1%-2%, antioxidant 1%-2%, color master 1%-2%; the maleic anhydride grafting rate of the ternary ethylene-propylene copolymer grafted maleic anhydride is 1.0-1.5%;

[0012] Step S2, after drying the repair material base material granules, extruding to form a repair material sheet;

[0013] Step S3, the repair material sheet is crosslinked by radiation to obtain a repair material base material, and the radiation crosslinking dose is 120-170 kGy;

[0014] Step S4, coating polypropylene hot melt adhesive on the repair material base material to obtain the 3LPP pipeline anticorrosive coating repair material.

[0015] The 3LPP pipeline anticorrosion layer repairing material obtained by the technical scheme can be used for repairing the anticorrosion layer damage of the 3LPP pipeline, has excellent soil stress resistance, can withstand more than 50 times of back and forth dragging in a sand box at high temperature, can withstand the open fire baking of a liquefied gas spray gun for a long time (at least 30 minutes) without degradation phenomena such as oil bleeding and carbonization, can form good adhesion with the polypropylene anticorrosion layer, and after being exposed to the sun for a long time (90 days), the edge is warped, the surface is not cracked and not powdered, and has a very small shrinkage rate (both the circumferential and axial shrinkage rates are less than 5%). Most importantly, the 3LPP pipeline anticorrosion layer repairing material can be directly installed by flame baking, which reduces the construction difficulty and repairing cost and improves the construction efficiency.

[0016] As a further improvement of the present application, the metallocene polypropylene has a melt flow index of 8-15 g / 10 min and a melting point of 140-150 DEG C.

[0017] As a further improvement of the present application, the metallocene polyethylene has a melt flow index of 0.5-5 g / 10 min.

[0018] As a further improvement of the present application, the metallocene polypropylene includes at least one of RM5500 of LyondellBasell, MR10MX0 of Dow, and MFX3 of Japan Polypropylene Corporation.

[0019] As a further improvement of the present application, the metallocene polyethylene includes at least one of mPE K4750 of Asahi Kasei, mPE 3527PA of ExxonMobil, mPE 2018CA of ExxonMobil, and mPE 8656MA of ExxonMobil.

[0020] As a further improvement of the present application, the polyether ether ketone includes at least one of VESTOSINT 450PF, VESTOSINT 150PF, 550P of Zhongyan Gaosu, and KT-820P of Solvay.

[0021] As a further improvement of the present application, the ethylene-propylene-diene copolymer grafted with maleic anhydride has an ethylene content of 65%-75% and a propylene content of 25%-35%.

[0022] As a further improvement of the present application, the ethylene-propylene-diene copolymer grafted with maleic anhydride includes at least one of 3092PM of Mitsui, 3720P of Dow Chemical, and 725P of Dow Chemical.

[0023] As a further improvement of the present application, the nano organic montmorillonite is nano montmorillonite modified by a silane coupling agent.

[0024] As a further improvement of the present application, the sensitizer is at least one of a trifunctional acrylate or a trifunctional allyl ester.

[0025] As a further improvement of the present application, the antioxidant comprises a primary antioxidant and a secondary antioxidant, further, the primary antioxidant is at least one of antioxidant 1010, antioxidant 1076 or antioxidant SKY-1035, and the secondary antioxidant is at least one of antioxidant DLTDP, antioxidant DSTDP or antioxidant 168.

[0026] As a further improvement of the present application, the color masterbatch is a black color masterbatch, and the content of carbon black is 35-55%.

[0027] As a further improvement of the present application, in step S1, the granulation adopts a double screw extruder, and the barrel and die temperature of the double screw extruder is set as follows:

[0028] Barrel: 100-120℃ for the first zone, 120-140℃ for the second zone, 140-160℃ for the third zone, 170-190℃ for the fourth zone, 190-210℃ for the fifth zone, 210-230℃ for the sixth zone, 220-240℃ for the seventh zone, and 210-230℃ for the eighth zone;

[0029] Die: 210-230℃.

[0030] As a further improvement of the present application, in step S2, after drying the granulated material of the repair material base material, a double screw extruder is adopted to extrude and form a sheet, and the barrel and die temperature of the double screw extruder for extruding and forming the sheet is set as follows:

[0031] Barrel: 100-120℃ for the first zone, 120-140℃ for the second zone, 140-160℃ for the third zone, 170-190℃ for the fourth zone, 190-210℃ for the fifth zone, 210-230℃ for the sixth zone, 220-240℃ for the seventh zone, and 210-230℃ for the eighth zone;

[0032] Die: 210-230℃.

[0033] As a further improvement of the present application, in step S3, the radiation crosslinking adopts an electron accelerator for radiation crosslinking.

[0034] As a further improvement of the present application, in step S4, the thickness of the polypropylene hot melt adhesive is 0.7-1.0mm. Further preferably, the thickness of the polypropylene hot melt adhesive is 0.8mm. Wherein, the polypropylene hot melt adhesive adopts the prior art.

[0035] As a further improvement of the present application, the preparation method of the ethylene-propylene-diene terpolymer grafted with maleic anhydride comprises: adding the ethylene-propylene-diene terpolymer into a twin-screw extruder for melting, then calculating the required mass of MAH monomer according to the set grafting rate, adding the MAH monomer and a thermal initiator into the middle part of the screw through a metering pump for melt grafting, and obtaining the ethylene-propylene-diene terpolymer grafted with maleic anhydride after granulation.

[0036] Further, the temperature of the twin-screw extruder is set to 170-190℃, and the rotation speed is 50-70r / min.

[0037] Further, the thermal initiator is BPO. The present application also discloses a 3LPP pipeline anticorrosive coating repair material prepared by the preparation method of any one of the above.

[0038] Compared with the prior art, the present application has the following beneficial effects:

[0039] The repair material adopting the technical solution of the present application improves the internal strength and radiation crosslinking degree of the material by selecting metallocene polypropylene and metallocene polyethylene with appropriate properties as the main material, and selecting the ethylene-propylene-diene terpolymer grafted with maleic anhydride as the compatibilizer of polypropylene, polyethylene, polyether ether ketone and a sensitizer, and combining the radiation crosslinking mode, thereby improving the fire baking performance of the sheet, and greatly improving the dimensional stability (low shrinkage rate), fire baking performance, long-term sunlight exposure performance, scratch resistance and soil stress resistance of the repair material. In addition, by adding the nano organic montmorillonite in the repair material substrate, oxygen is effectively blocked, so that the repair material substrate is not easily degraded during electron accelerator irradiation and sunlight exposure, and the weather resistance and radiation resistance of the material are improved. DETAILED DESCRIPTION

[0040] The following further describes a preferred embodiment of the present application.

[0041] The 3LPP pipeline anticorrosive coating repair material is mainly used for repairing the anticorrosive coating damage of the pipe body of the 3LPP pipeline, and the repair material is required to meet the following requirements: ①, it has excellent soil stress resistance and can withstand more than 50 times of dragging in the sand box at high temperature; ②, it can withstand the fire baking of the liquefied gas spray gun for a long time (at least 30 minutes) without degradation phenomena such as oil bleeding and carbonization; ③, it can form good adhesion with the polypropylene anticorrosive coating, and the edge is not warped and the surface is not cracked and powdered after long-term (90 days) exposure to sunlight; ④, it has a very small shrinkage rate (the circumferential and axial shrinkage rates are both less than 5%). The 3LPP pipeline anticorrosive coating repair material comprises a repair material substrate and a hot melt adhesive part.

[0042] The repair material substrate is obtained by breaking through the formula, selecting a suitable formula, and performing processes such as batching, mixing, double-screw extrusion granulation, double-screw extrusion sheet, and electron accelerator irradiation crosslinking. The preparation method comprises the following steps:

[0043] In step S1, the raw materials of the repair material substrate are weighed according to the formula, mixed, and uniformly mixed raw materials of the repair material substrate are fed into the discharge port of the double-screw extruder through a hopper, melted, extruded and pelletized according to the following process, and granulated repair material substrate is obtained:

[0044] The formula of the raw materials of the repair material substrate, i.e., the components and their mass percentages, is as follows: metallocene polypropylene (mPP) 55-65%; metallocene polyethylene (mPE) 10%-20%; ethylene-propylene-diene monomer grafted maleic anhydride (EPDM-g-MAH) 12%-18%; polyether ether ketone (PEEK) 3%-5%; nano-organic montmorillonite 1%-3%; sensitizer 1%-2%; primary antioxidant 0.5%-1%; secondary antioxidant 0.5%-1%; black masterbatch 1%-2%.

[0045] The metallocene polypropylene has a melt flow index of 8-15 g / 10 min and a melting point of 140-150℃, and can be selected from RM5500 (MI=15 g / 10 min) of LyondellBasell, MR10MX0 (MI=10 g / 10 min) of Dow, MFX3 (MI=8 g / 10 min) of Japan Polypropylene Co., Ltd., etc.

[0046] The metallocene polyethylene has a melt flow index of 0.5-5 g / 10 min and is an extrusion grade, and can be selected from mPE K4750 (MI=5.0 g / 10 min) of Asahi Kasei, mPE 3527PA (MI=3.5 g / 10 min) of ExxonMobil, mPE 2018CA (MI=2.0 g / 10 min) of ExxonMobil, mPE 8656MA (MI=0.5 g / 10 min) of ExxonMobil, etc.

[0047] The ethylene-propylene-diene monomer grafted maleic anhydride is independently processed and modified, and has a maleic anhydride grafting rate of 1.0-1.5%. The ethylene content of the selected ethylene-propylene-diene monomer is 65%-75%, and the propylene content is 25%-35%. The ethylene-propylene-diene monomer that can be used for grafting modification can be selected from 3092PM of Mitsui, 3720P of Dow Chemical, 725P of Dow Chemical, etc.

[0048] The polyether ether ketone is micron-sized PEEK in the form of a powder, and can be selected from 450PF, 150PF of Victrex, 550P of Zhongyan Gao Sui, KT-820P of Solvay, etc.

[0049] The nano-organic montmorillonite is nano-montmorillonite modified by a silane coupling agent.

[0050] The sensitizer is at least one of a trifunctional acrylate or a trifunctional allyl ester, and specifically can be at least one of trimethylolpropane trimethacrylate (TMPTMA), trihydroxypropane triacrylate (TMPTA), triallyl cyanurate (TAC), triallyl isocyanurate (TAIC), etc.

[0051] The primary antioxidant is at least one of antioxidant 1010, antioxidant 1076, or antioxidant SKY-1035.

[0052] The secondary antioxidant is at least one of antioxidant DLTDP, antioxidant DSTDP, or antioxidant 168.

[0053] The black masterbatch is a polyethylene special black masterbatch with a carbon black content of 50%.

[0054] The temperature settings of the twin-screw extruder are as follows:

[0055] The barrel is as follows:

[0056] The first zone is 110±10°C, the second zone is 130±10°C, the third zone is 150±10°C, the fourth zone is 180±10°C, the fifth zone is 200±10°C, the sixth zone is 220±10°C, the seventh zone is 230±10°C, and the eighth zone is 220±10°C.

[0057] The die head is as follows:

[0058] The first zone is 220±10°C, the second zone is 220±10°C, and the third zone is 220±10°C.

[0059] The repair material base material granules are placed in a dryer at 90°C for heating and drying moisture, and the drying time is 30 min.

[0060] In step S2, the repair material base material granules are placed in a dryer at 90°C for heating and drying moisture, and the drying time is 30 min. The dried repair material base material granules are added to the discharge port of the twin-screw extruder through a hopper, and are subjected to the following processes: melting, extrusion of a sheet, three-roll calendering and stretching, cooling and slitting, to obtain a non-irradiated repair material base material with a thickness of 1.0±0.01 mm and a shrinkage rate of 10-15%. In this step, the temperature settings of the twin-screw extruder are as follows:

[0061] The barrel is as follows:

[0062] First zone: 110 ± 10°C, second zone: 130 ± 10°C; third zone: 150 ± 10°C; fourth zone: 180 ± 10°C; fifth zone: 200 ± 10°C; sixth zone: 220 ± 10°C; seventh zone: 230 ± 10°C; eighth zone 220 ± 10°C;

[0063] Die:

[0064] First zone: 220 ± 10°C; second zone: 220 ± 10°C; third zone: 220 ± 10°C; fourth zone: 220 ± 10°C; fifth zone: 220 ± 10°C.

[0065] Step S3, after the cut repair material substrate is irradiated by the electron accelerator at a high dose (irradiation dose 120-170 kGy) to crosslink, a radiation crosslinked repair material substrate with good fire resistance, circumferential shrinkage and axial shrinkage less than 5% is obtained.

[0066] Step S4, a double screw extruder is used to coat 0.8 mm thick polypropylene hot melt adhesive (using commercially available products, such as polypropylene hot melt adhesive prepared according to Chinese patent 202010045372.1 or French Arkema PP Arkema 18751, etc.) on the repair material substrate, to obtain a 3LPP pipeline anticorrosive coating repair material that can be directly installed by liquefied gas spray torch open flame baking, has excellent soil stress resistance, and will not warp, crack and powder after long time exposure to sunlight.

[0067] The repair material substrate is a key component of the 3LPP pipeline anticorrosive coating repair material, and its performance directly determines the installation performance and use performance of the 3LPP pipeline anticorrosive coating repair material. The repair material substrate in the embodiment of the present application improves the internal strength and radiation crosslinking degree of the material by selecting a suitable formula, thereby improving the open flame baking performance of the sheet; and combined with high-dose electron accelerator irradiation, polyether ether ketone molecular chain segments are introduced into the crosslinked network of the repair material substrate, greatly improving the dimensional stability (low shrinkage), open flame baking performance, long-term sunlight exposure performance, scratch resistance and soil stress resistance of the repair material. In addition, the addition of nano-organic montmorillonite in the repair material substrate can effectively block oxygen, so that the repair material substrate is not easily degraded during electron accelerator irradiation and sunlight exposure, improving the weather resistance and radiation resistance of the material.

[0068] The above method is used in combination with specific examples for illustration.

[0069] Example 1

[0070] In this embodiment, the repair material substrate contains the following components and their mass percentages: metallocene polypropylene (MR10MX0) 55%; metallocene polyethylene (K4750) 20%; ethylene-propylene-diene terpolymer grafted with maleic anhyth (3092PM-g-MAH) 18% (maleic anhydride grafting rate 1.0%); polyether ether ketone (150PF) 3%; nano organic montmorillonite 1.0%; sensitizer (TAIC) 1.0%; primary antioxidant (1076) 0.5%; secondary antioxidant (DLTDP) 0.5%; black masterbatch 1%. Other steps and process parameters are the same as described above.

[0071] The ethylene-propylene-diene terpolymer grafted with maleic anhydride is prepared by the following steps: the twin-screw extruder is heated to 180°C, the twin-screw extruder is started at a speed of 60 r / min, and the ethylene-propylene-diene terpolymer is added to be completely melted; then, according to the required grafting rate, a certain amount of MAH monomer and initiator BPO are added in the middle of the screw through a metering pump for melt grafting, and the ethylene-propylene-diene terpolymer grafted with maleic anhydride is obtained after granulation.

[0072] Example 2

[0073] On the basis of Example 1, the difference between this embodiment is that the formula of the repair material substrate is different. In this embodiment, the repair material substrate contains the following components and their mass percentages: metallocene polypropylene (MFX3) 65%; metallocene polyethylene (2018CA) 10%; ethylene-propylene-diene terpolymer grafted with maleic anhydride (725P-g-MAH) (maleic anhydride grafting rate 1.0%) 12%; polyether ether ketone (550P) 5%; nano organic montmorillonite 3%; sensitizer (TMPTMA) 1.5%; primary antioxidant (1010) 0.8%; secondary antioxidant (DSTDP) 0.7%; black masterbatch 2.0%. Other steps and process parameters are the same as described in Example 1.

[0074] Example 3

[0075] On the basis of Example 1, the difference between this embodiment is that the formula of the repair material substrate is different. In this embodiment, the repair material substrate contains the following components and their mass percentages: metallocene polypropylene (RM5500) 60%; metallocene polyethylene (3527PA) 15%; ethylene-propylene-diene terpolymer grafted with maleic anhydride (3720P-g-MAH) 15% (maleic anhydride grafting rate 1.5 wt.%); polyether ether ketone (450PF) 4%; nano organic montmorillonite 2%; sensitizer (TMPTMA / TAIC) 1.5%; primary antioxidant (1010) 0.8%; secondary antioxidant (DSTDP) 0.7%; black masterbatch 1%. Other steps and process parameters are the same as described in Example 1.

[0076] Example 4

[0077] On the basis of Example 1, the difference of the present example is that the formulation of the repair material substrate is different, in the present example, the repair material substrate comprises the following components and their mass percentages: metallocene polypropylene (RM5500) 60%; metallocene polyethylene (3527PA) 20%; ternary ethylene-propylene copolymer grafted maleic anhydride (3720P-g-MAH) 12% (maleic anhydride grafting rate 1.5 wt.%); polyether ether ketone (450PF) 3%; nano organic montmorillonite 1%; sensitizer (TMPTMA / TAIC) 1.0%; primary antioxidant (1010) 1.0%; secondary antioxidant (DSTDP) 0.5%; black masterbatch 1.5%. Other steps and process parameters are the same as those of Example 1.

[0078] Example 5

[0079] On the basis of Example 1, the difference of the present example is that the formulation of the repair material substrate is different, in the present example, the repair material substrate comprises the following components and their mass percentages: metallocene polypropylene (RM5500) 60%; metallocene polyethylene (3527PA) 20%; ternary ethylene-propylene copolymer grafted maleic anhydride (3720P-g-MAH) 12% (maleic anhydride grafting rate 1.5 wt.%); polyether ether ketone (450PF) 3%; nano organic montmorillonite 1%; sensitizer (TMPTMA / TAIC) 1.0%; primary antioxidant (1010) 1.0%; secondary antioxidant (DSTDP) 0.5%; black masterbatch 1.5%. Other steps and process parameters are the same as those of Example 1.

[0080] In Examples 1-5, the 3LPP pipeline anticorrosive coating repair substrate obtained in step S1 is detected according to the contents of Table 1. The 3LPP pipeline anticorrosive coating repair material obtained in step S4 is detected according to Table 2, and the obtained performance is shown in Tables 3 and 4.

[0081] Table 1 Performance indicators of 3LPP pipeline anticorrosive coating repair substrate

[0082]

[0083] Table 2 Performance indicators of 3LPP pipeline anticorrosive coating repair material

[0084]

[0085] Table 3 Performance test results of the substrate of Examples 1-5

[0086]

[0087] Table 4 Performance test results of the repair material of Examples 1-5

[0088]

[0089] Comparative Example 1

[0090] On the basis of Example 3, the difference of the present comparative example is that the formulation of the repair material substrate is different, in the present comparative example, the repair material substrate comprises the following components and their mass percentages: metallocene polypropylene (RM5500) 50%; metallocene polyethylene (3527PA) 25%; ethylene-propylene-diene terpolymer grafted maleic anhydride (3720P-g-MAH) 15% (maleic anhydride grafting rate 1.5 wt.%); polyether ether ketone (450PF) 4%; nano-organic montmorillonite 2%; sensitizer (TMPTMA / TAIC) 1.5%; primary antioxidant (1010) 0.8%; secondary antioxidant (DSTDP) 0.7%; black masterbatch 1%. Other steps and process parameters are the same as those of Example 1.

[0091] Comparative Example 2

[0092] On the basis of Comparative Example 1, in the present comparative example, the repair material substrate comprises the following components and their mass percentages: metallocene polypropylene (RM5500) 70%; metallocene polyethylene (3527PA) 5%; ethylene-propylene-diene terpolymer grafted maleic anhydride (3720P-g-MAH) 15% (maleic anhydride grafting rate 1.5 wt.%); polyether ether ketone (450PF) 4%; nano-organic montmorillonite 2%; sensitizer (TMPTMA / TAIC) 1.5%; primary antioxidant (1010) 0.8%; secondary antioxidant (DSTDP) 0.7%; black masterbatch 1%. Other steps and process parameters are the same as those of Example 1.

[0093] Comparative Example 3

[0094] On the basis of Comparative Example 1, in the present comparative example, the repair material substrate comprises the following components and their mass percentages: metallocene polypropylene (RM5500) 60%; metallocene polyethylene (3527PA) 20%; ethylene-propylene-diene terpolymer grafted maleic anhydride (3720P-g-MAH) 10% (maleic anhydride grafting rate 1.5 wt.%); polyether ether ketone (450PF) 3%; nano-organic montmorillonite 2%; sensitizer (TMPTMA / TAIC) 1.0%; primary antioxidant (1010) 1.0%; secondary antioxidant (DSTDP) 1.0%; black masterbatch 2.0%. Other steps and process parameters are the same as those of Example 1.

[0095] Comparative Example 4

[0096] On the basis of Comparative Example 3, in this comparative example, the components and their mass percentages contained in the repair material substrate are: metallocene polypropylene (RM5500) 58%; metallocene polyethylene (3527PA) 10%; ethylene-propylene-diene terpolymer grafted with maleic anhydride (3720P-g-MAH) 20% (maleic anhydride grafting rate 1.5 wt.%); polyether ether ketone (450PF) 5%; nano-organic montmorillonite 1.0%; sensitizer (TMPTMA / TAIC) 2.0%; primary antioxidant (1010) 1.0%; secondary antioxidant (DSTDP) 1.0%; black masterbatch 2.0%. Other steps and process parameters are the same as in Example 1.

[0097] Comparative Example 5

[0098] On the basis of Example 1, in this comparative example, the components and their mass percentages contained in the repair material substrate are: metallocene polypropylene (MR10MX0) 60%; metallocene polyethylene (K4750) 20%; ethylene-propylene-diene terpolymer grafted with maleic anhydride (3092PM-g-MAH) 10% (maleic anhydride grafting rate 1.0%); polyether ether ketone (150PF) 3%; nano-organic montmorillonite 1.0%; sensitizer (TAIC) 2.0%; primary antioxidant (1076) 1.0%; secondary antioxidant (DLTDP) 1.0%; black masterbatch 2.0%. Other steps and process parameters are the same as in Example 1.

[0099] Comparative Example 6

[0100] On the basis of Comparative Example 5, in this comparative example, the components and their mass percentages contained in the repair material substrate are: metallocene polypropylene (MR10MX0) 58%; metallocene polyethylene (K4750) 10%; ethylene-propylene-diene terpolymer grafted with maleic anhydride (3092PM-g-MAH) 20% (maleic anhydride grafting rate 1.0%); polyether ether ketone (150PF) 5%; nano-organic montmorillonite 1.0%; sensitizer (TAIC) 2.0%; primary antioxidant (1076) 1.0%; secondary antioxidant (DLTDP) 1.0%; black masterbatch 2.0%. Other steps and process parameters are the same as in Example 1.

[0101] Comparative Example 7

[0102] On the basis of Comparative Example 5, in this comparative example, the components and their mass percentages contained in the repair material substrate are: metallocene polypropylene (MR10MX0) 60%; metallocene polyethylene (K4750) 15%; ethylene-propylene-diene terpolymer grafted with maleic anhydride (3092PM-g-MAH) 15% (maleic anhydride grafting rate 0.5%); polyether ether ketone (150PF) 4%; nano-organic montmorillonite 2.0%; sensitizer (TAIC) 1.5%; primary antioxidant (1076) 0.8%; secondary antioxidant (DLTDP) 0.7%; black masterbatch 1.0%. Other steps and process parameters are the same as in Example 1.

[0103] Comparative Example 8

[0104] On the basis of Comparative Example 7, in this comparative example, the components and their mass percentages contained in the repair material substrate are: metallocene polypropylene (MR10MX0) 60%; metallocene polyethylene (K4750) 15%; ethylene-propylene-diene terpolymer grafted with maleic anhydride (3092PM-g-MAH) 15% (maleic anhydride grafting rate 1.8%); polyether ether ketone (150PF) 4%; nano-organic montmorillonite 2.0%; sensitizer (TAIC) 1.5%; primary antioxidant (1076) 0.8%; secondary antioxidant (DLTDP) 0.7%; black masterbatch 1.0%. Other steps and process parameters are the same as in Example 1.

[0105] Comparative Example 9

[0106] On the basis of Comparative Example 7, in this comparative example, the components and their mass percentages contained in the repair material substrate are: metallocene polypropylene (MR10MX0) 60%; metallocene polyethylene (K4750) 15%; ethylene-propylene-diene terpolymer (3092PM) 15%; polyether ether ketone (150PF) 4%; nano-organic montmorillonite 2.0%; sensitizer (TAIC) 1.5%; primary antioxidant (1076) 0.8%; secondary antioxidant (DLTDP) 0.7%; black masterbatch 1.0%. Other steps and process parameters are the same as in Example 1.

[0107] Comparative Example 10

[0108] On the basis of Example 3, in this comparative example, the repair material substrate contains the following components and their mass percentages: metallocene polypropylene (RM5500) 60%; metallocene polyethylene (3527PA) 17%; ethylene-propylene-diene terpolymer grafted with maleic anhydride (3720P-g-MAH) 15% (maleic anhydride grafting rate 1.5 wt.%); polyether ether ketone (450PF) 2%; nano-organic montmorillonite 2%; sensitizer (TMPTMA / TAIC) 1.5%; primary antioxidant (1010) 0.8%; secondary antioxidant (DSTDP) 0.7%; black masterbatch 1.0%. Other steps and process parameters are the same as in Example 1.

[0109] Comparative Example 11

[0110] On the basis of Comparative Example 10, in this comparative example, the repair material substrate contains the following components and their mass percentages: metallocene polypropylene (RM5500) 60%; metallocene polyethylene (3527PA) 13%; ethylene-propylene-diene terpolymer grafted with maleic anhydride (3720P-g-MAH) 15% (maleic anhydride grafting rate 1.5 wt.%); polyether ether ketone (450PF) 6%; nano-organic montmorillonite 2%; sensitizer (TMPTMA / TAIC) 1.5%; primary antioxidant (1010) 0.8%; secondary antioxidant (DSTDP) 0.7%; black masterbatch 1.0%. Other steps and process parameters are the same as in Example 1.

[0111] Comparative Example 12

[0112] On the basis of Example 3, in this comparative example, the repair material substrate contains the following components and their mass percentages: conventional polypropylene (Yanshan Petrochemical K7912) 60%; metallocene polyethylene (3527PA) 15%; ethylene-propylene-diene terpolymer grafted with maleic anhydride (3720P-g-MAH) 15% (maleic anhydride grafting rate 1.5 wt.%); polyether ether ketone (450PF) 4%; nano-organic montmorillonite 2%; sensitizer (TMPTMA / TAIC) 1.5%; primary antioxidant (1010) 0.8%; secondary antioxidant (DSTDP) 0.7%; black masterbatch 1%. Other steps and process parameters are the same as in Example 1.

[0113] Comparative Example 13

[0114] On the basis of Example 3, in the present comparative example, the components and their mass percentages in the repair material substrate are as follows: metallocene polypropylene (RM5500) 60%; conventional low-density polyethylene (Yanshan Petrochemical LD607) 15%; ethylene-propylene-diene terpolymer grafted with maleic anhydride (3720P-g-MAH) 15% (maleic anhydride grafting rate 1.5 wt.%); polyether ether ketone (450PF) 4%; nano-organic montmorillonite 2%; sensitizer (TMPTMA / TAIC) 1.5%; primary antioxidant (1010) 0.8%; secondary antioxidant (DSTDP) 0.7%; black masterbatch 1%. Other steps and process parameters are the same as those in Example 1.

[0115] Comparative Examples 1-13 were tested according to the requirements of the above examples, and the results are shown in Tables 5-8.

[0116] Table 5 Substrate performance test results of Comparative Examples 1-6

[0117]

[0118] Table 6 Repair material performance test results of Comparative Examples 1-6

[0119]

[0120] Table 7 Substrate performance test results of Comparative Examples 7-13

[0121]

[0122] Table 8 Repair material performance test results of Comparative Examples 7-13

[0123]

[0124] As can be seen from the performance comparison of the examples and comparative examples in Tables 3-8, the repair substrate of the present application has low shrinkage, conventional performance meets standard requirements, good dimensional stability, and the 3LPP pipeline anticorrosion coating repair material has good performance in terms of resistance to open flame baking, long-term resistance to sunlight, scratch resistance and soil stress resistance, can be directly installed by flame baking, reduces the repair cost and difficulty of 3LPP pipeline, and improves the construction efficiency.

[0125] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application should not be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all of these should be considered as falling within the protection scope of the present application.

Claims

1. A method for preparing a 3LPP pipeline anti-corrosion coating repair material, characterized in that: Includes the following steps: Step S1: Mix the raw materials of the repair material substrate evenly, and then granulate them to obtain granulated repair material substrate; wherein, the components and their mass percentages contained in the repair material substrate are as follows: The composition includes 55-65% metallocene polypropylene, 10-20% metallocene polyethylene, 12-18% ethylene propylene diene copolymer grafted with maleic anhydride, 3-5% polyether ether ketone, 1-3% nano-organo-montmorillonite, 1-2% sensitizer, 1-2% antioxidant, and 1-2% color masterbatch; the maleic anhydride grafting rate of the ethylene propylene diene copolymer grafted with maleic anhydride is 1.0-1.5%. Step S2: After drying the granulated material of the repair material substrate, it is extruded into a repair material sheet. Step S3: The repair material sheet is subjected to radiation crosslinking to obtain a repair material substrate, wherein the radiation crosslinking irradiation dose is 120-170 kGy; Step S4: Coat the repair material substrate with polypropylene hot melt adhesive to obtain the 3LPP pipeline anti-corrosion layer repair material.

2. The preparation method of the 3LPP pipeline anti-corrosion coating repair material according to claim 1, characterized in that: The metallocene polypropylene has a melt flow index of 8–15 g / 10 min and a melting point of 140–150 °C; the metallocene polyethylene has a melt flow index of 0.5–5 g / 10 min.

3. The preparation method of the 3LPP pipeline anti-corrosion coating repair material according to claim 2, characterized in that: The metallocene polypropylene includes at least one of LyondellBasell's RM5500, Total's MR10MX0, and Nippon Polypropylene's MFX3. The metallocene polyethylene includes at least one of Asahi Kasei's mPE K4750, ExxonMobil's mPE 3527PA, ExxonMobil's mPE 2018CA, and ExxonMobil's mPE 8656MA. The polyetheretherketone includes at least one of Vigus 450PF, Vigus 150PF, Zhongyan Gaosu 550P, and Solvay KT-820P.

4. The preparation method of the 3LPP pipeline anti-corrosion coating repair material according to claim 2, characterized in that: The ethylene content of the EPDM grafted with maleic anhydride is 65%–75%, and the propylene content is 25%–35%.

5. The preparation method of the 3LPP pipeline anti-corrosion coating repair material according to claim 4, characterized in that: The EPDM copolymer grafted with maleic anhydride includes at least one of Mitsui Chemicals' 3092PM, Dow Chemical's 3720P, and Dow Chemical's 725P.

6. The preparation method of the 3LPP pipeline anti-corrosion coating repair material according to claim 5, characterized in that: The nano-organic montmorillonite is nano-montmorillonite modified with a silane coupling agent; the sensitizer is at least one of trifunctional acrylate or trifunctional allyl ester; the antioxidant includes a primary antioxidant and a secondary antioxidant, wherein the primary antioxidant is at least one of antioxidant 1010, antioxidant 1076 or antioxidant SKY-1035, and the secondary antioxidant is at least one of antioxidant DLTDP, antioxidant DSTDP or antioxidant 168.

7. The method for preparing the 3LPP pipeline anti-corrosion coating repair material according to any one of claims 1 to 6, characterized in that: The masterbatch is a black masterbatch with a carbon black content of 35-55%.

8. The method for preparing the 3LPP pipeline anti-corrosion coating repair material according to any one of claims 1 to 6, characterized in that: In step S1, the granulation is performed using a twin-screw extruder, and the barrel and die temperatures of the twin-screw extruder are set as follows: Barrel: Zone 1 100-120℃, Zone 2 120-140℃, Zone 3 140-160℃, Zone 4 170-190℃, Zone 5 190-210℃, Zone 6 210-230℃, Zone 7 220-240℃, Zone 8 210-230℃; Die head: 210-230℃; Step S2: After drying the dried repair material substrate granules, extrude and form sheets using a twin-screw extruder. The barrel and die temperatures of the twin-screw extruder for extruding the sheets are set as follows: Barrel: Zone 1 100-120℃, Zone 2 120-140℃, Zone 3 140-160℃, Zone 4 170-190℃, Zone 5 190-210℃, Zone 6 210-230℃, Zone 7 220-240℃, Zone 8 210-230℃; Die head: 210-230℃.

9. The preparation method of the 3LPP pipeline anti-corrosion coating repair material according to claim 8, characterized in that: In step S3, the radiation crosslinking is performed using an electron accelerator.

10. A 3LPP pipeline anti-corrosion coating repair material, characterized in that: It is prepared using the preparation method of the 3LPP pipeline anti-corrosion layer repair material as described in any one of claims 1 to 9.

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