CN111363486A - Radiation cross-linked polyethylene composite belt for corrosion prevention of buried steel elbow pipe and preparation method thereof - Google Patents
Radiation cross-linked polyethylene composite belt for corrosion prevention of buried steel elbow pipe and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a radiation cross-linked polyethylene composite belt for corrosion prevention of a buried steel elbow, which consists of a double-layer structure, wherein one layer is a high-density polyolefin substrate layer subjected to radiation cross-linking, and the other layer is a polyolefin adhesive layer; wherein the radiation crosslinked high density polyolefin substrate layer comprises: 40-60% of high-density polyethylene, 20-40% of low-density polyethylene, 5-15% of polyolefin elastomer, 1-3% of carbon black, 0.5-2% of first antioxidant and 0.5-2% of ultraviolet stabilizer; the polyolefin adhesive layer comprising: 60-70% of polyethylene modified material, 10-30% of ethylene-ethylene ethyl acrylate-maleic anhydride terpolymer, 5-15% of ethylene propylene diene monomer rubber, 1-3% of carbon black and 0.5-2% of second antioxidant. According to the invention, the radiation crosslinking polyethylene composite belt is formed by thermally sealing a special polyethylene material and an adhesive by a cold belt hot winding polyethylene composite belt, so that the defect that the anticorrosion form of other bent pipes is not matched with the common 3LPE of straight pipes is overcome, the consistency of the anticorrosion quality of the bent pipes and the straight pipes is realized, and the anticorrosion performance and the reliability are greatly improved.
Description
Technical Field
The invention relates to the technical field of radiation cross-linked polyethylene composite belts, in particular to a radiation cross-linked polyethylene composite belt for corrosion prevention of a buried steel elbow pipe, and further relates to a preparation method of the polyethylene composite belt.
Background
For corrosion prevention of steel pipelines, due to the particularity of the shape of the hot-bending elbow, the coating operation of the outer corrosion-resistant layer is difficult and is often a weak link of the outer corrosion-resistant layer of the whole pipeline. The hot-bending bend is difficult to coat and operate and has higher requirements on transportation and stacking, so the outer anticorrosive layer of the hot-bending bend is made of materials with reliable performance, good technical economy and convenient transportation, stacking and construction operation. At present, the domestic hot-bending elbow mainly comprises five external anticorrosive materials, namely liquid epoxy coating, single-layer fusion bonded epoxy powder (single-layer FBE), a three-layer radiation cross-linked polyethylene heat shrinkage sleeve (belt), double-layer fusion bonded epoxy powder (double-layer FBE) and a polyethylene (propylene) adhesive belt.
The outer anticorrosive layer of the hot bending elbow can be divided into two types, one type is prefabricated on an anticorrosive operation line of the elbow, such as single-layer fusion bonding epoxy powder (single-layer FBE) and double-layer fusion bonding epoxy powder (double-layer FBE), and the outer anticorrosive layer has the advantages of being influenced by the external environment and relatively less restricted by operators once the coating parameters are well adjusted, and having stable anticorrosive layer effect. The defects are that the requirements on an operation line and a transportation link are high, the construction progress is influenced to a certain extent once the west-east gas is transported due to the prefabrication and transportation capacity lag of the double-layer FBE bent pipe, and the outer anticorrosive coating of the bent pipe is easy to damage in the transportation and carrying processes, so that the damage repairing workload is increased.
The other type can be operated on site, such as a liquid epoxy coating anticorrosive layer, a three-layer structure radiation crosslinking polyethylene heat-shrinkable sleeve (tape) and a polyethylene (propylene) adhesive tape. The main advantage of such an outer corrosion protection layer is the pressure on prefabrication and transport of the bent pipe, and the mechanical properties requirements can be suitably relaxed since long-distance transport is not required. The disadvantages are that the construction technology has higher requirements, and is influenced by external environments (such as rain, fog, sand and dust) and restricted by quality factors of operators.
In view of the above, there is a need to develop a novel radiation cross-linked polyethylene composite belt for corrosion prevention of buried steel elbow pipes, so as to overcome the disadvantages of the traditional corrosion prevention products and methods, and provide a more efficient and reliable corrosion prevention composite belt for corrosion prevention processing of elbow pipes.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a novel radiation crosslinking polyethylene composite belt for corrosion prevention of a buried steel elbow, the radiation crosslinking polyethylene composite belt is prepared by coating a high-performance adhesive on a high-strength polyethylene base material, the defects of the traditional corrosion prevention product and the traditional corrosion prevention mode are overcome, and a more efficient and reliable corrosion prevention product is provided for corrosion prevention processing of the elbow.
Specifically, the invention provides a radiation crosslinking polyethylene composite belt for corrosion prevention of a buried steel elbow, which is composed of a double-layer structure, wherein one layer is a high-density polyolefin substrate layer subjected to radiation crosslinking, and the other layer is a polyolefin adhesive layer.
The radiation crosslinked high-density polyolefin substrate layer comprises the following components in percentage by mass: 40-60% of high-density polyethylene, 20-40% of low-density polyethylene, 5-15% of polyolefin elastomer, 1-3% of carbon black, 0.5-2% of first antioxidant and 0.5-2% of ultraviolet stabilizer.
The polyolefin adhesive layer comprises the following components in percentage by mass: 60-70% of polyethylene modified material, 10-30% of ethylene-ethylene ethyl acrylate-maleic anhydride terpolymer, 5-15% of Ethylene Propylene Diene Monomer (EPDM), 1-3% of carbon black and 0.5-2% of second antioxidant.
In a preferred embodiment of the invention, the high density polyethylene has a density of between 0.94 and 0.96g/cm3The Shore hardness D is more than or equal to 60. The high-density polyethylene is used as a main material of a special polyethylene material, and the mechanical property of the polyethylene composite tape base material is ensured.
In a preferred embodiment of the invention, the low density polyethylene has a melt index of 1-3g/10min (190 ℃, 2.16 kg), low crystallinity, good flexibility, good mechanical properties, and good impact, tear and penetration resistance.
In a preferred embodiment of the present invention, the polyolefin elastomer is one or both of ethylene-octene copolymer (POE) and ethylene-propylene-diene monomer (EPDM). The polyolefin elastomer mainly improves the toughness of a system and improves the heat shrinkage of a high-density base material.
In a preferred embodiment of the present invention, the first antioxidant is selected from one or a combination of two of pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and n-octadecyl β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, typical examples of applications are antioxidant 1010 and antioxidant 1076.
In a preferred embodiment of the invention, the UV stabilizer may be selected from the group consisting of poly- { [6- [ (1, 1,3, 3-tetramethylbutyl) -imino ] -1,3, 5-triazine-2, 4-diyl ] [2- (2, 2,6, 6-tetramethylpiperidinyl) -azenyl ] -hexylene- [4- (2, 2,6, 6-tetramethylpiperidinyl) -amino ] }, a typical application example being UV-944 available from Bassfungs.
In a preferred embodiment of the present invention, the high density polyethylene substrate is irradiated by an electron radiation accelerator at a dose of 7 to 9 MeV.
In a preferred embodiment of the invention, the polyethylene modifier is a low density polyethylene grafted maleic anhydride (PE-g-MAH) modifier, the melt index is 5-20g/10min (190 ℃, 2.16 kg), and the grafting rate of the maleic anhydride is 0.8-1.5%.
In a preferred embodiment of the present invention, the ethylene-ethylene ethyl acrylate-maleic anhydride terpolymer has a melting point of 100 ℃ or higher, a melt index of 40-200g/10min (190 ℃, 2.16 kg), and a maleic anhydride content of 1.5-3%.
In a preferred embodiment of the invention, the ethylene-propylene-diene monomer (EPDM) has an ethylene component content of 65 to 75%.
In a preferred embodiment of the present invention, the second antioxidant is pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], and a typical example of application is antioxidant 1010.
The invention also aims to provide a preparation method of the radiation cross-linked polyethylene composite belt for corrosion prevention of the buried steel elbow, which mainly comprises two procedures, including the processing preparation of the high-density polyethylene base material and the coating processing preparation of the high-density polyethylene composite belt.
The processing and preparation steps of the high-density polyethylene substrate comprise: the base material raw materials are processed and formed by melt extrusion through a double-screw extrusion production line at the extrusion temperature of 160-200 ℃, and the high-density polyethylene base material sheet is prepared according to the required thickness and width and is wound. And then, conveying the polyethylene base material to an irradiation center, carrying out electron radiation crosslinking processing, and rolling for later use. The high-density polyethylene base material is subjected to irradiation processing by an electron radiation accelerator, and the irradiation processing dose is 7-9 MeV.
The coating processing preparation steps of the high-density polyethylene composite belt comprise: the raw materials of the polyolefin adhesive layer are extruded into sheets by heating and melting through a double-screw extrusion production line according to a certain proportion, and the sheets are coated on the surface of the high-density polyethylene base material by three-roller rolling, and then the sheets are cooled, cut and rolled. Wherein the extrusion temperature is 170-220 ℃.
The beneficial technical effects of the invention are as follows:
the invention relates to a radiation crosslinking polyethylene composite belt for corrosion prevention of a buried steel bent pipe, which is formed by thermally sealing a special polyethylene material and an adhesive in a mode of thermally winding the polyethylene composite belt by a cold belt. A winding machine is adopted to wind the composite belt on the surface of the bent pipe rotating along the curvature radius of the bent pipe, the composite belt is suitable for factory mechanical winding processing, the defect that the anticorrosion form of other bent pipes is not matched with the common 3LPE of the straight pipe is overcome, the consistency of the anticorrosion quality of the bent pipe and the straight pipe is realized, and the anticorrosion performance and the reliability are greatly improved. Meanwhile, the corrosion-resistant construction efficiency is high, the mechanical property is excellent, and the occurrence of collision and scratch in the bent pipe transportation process is avoided.
Detailed Description
The invention is further described with reference to specific examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
According to the mass percentage, the base material is high-density polyethylene (density is 0.94 g/cm)360 percent of Shore hardness D = 61), 30 percent of low-density polyethylene (the melt index is 1.2g/10 min), 5 percent of ethylene propylene diene monomer, 2.0 percent of carbon black, 10102.5 percent of antioxidant and 0.5 percent of ultraviolet stabilizer, and the high-density polyethylene base material is prepared by extrusion molding through a double-screw extrusion molding production line, wherein the extrusion temperature is 160-200 ℃ and then radiation processing is carried out according to the dose of 8 MeV.
65% of modified polyethylene material (PE-g-MAH) (the melt index is 14g/10min, and the grafting rate of maleic anhydride is 1.2%) as a raw material of a polyolefin adhesive, 20% of ethylene-ethylene ethyl acrylate-maleic anhydride terpolymer (the melting point is 110 ℃, the melt index is 40g/10min, and the content of maleic anhydride is 2.8%), 12% of ethylene propylene diene monomer, 1.5% of carbon black and 10101.5% of antioxidant are extruded and coated on the surface of a radiation crosslinking polyethylene base material through a double-screw extrusion production line to prepare a polyethylene composite belt, wherein the extrusion coating temperature is 170-220 ℃.
Example 2
According to the mass percentage, the base material is high-density polyethylene (density is 0.94 g/cm)3The high-density polyethylene base material is prepared by the following steps of 55% of Shore hardness D = 61), 32% of low-density polyethylene (with the melt index of 1.2g/10 min), 8% of ethylene-octene copolymer, 2.0% of carbon black, 10102.5% of antioxidant and 0.5% of ultraviolet stabilizer through extrusion molding by a double-screw extrusion molding production line, wherein the extrusion temperature is 160-200 ℃, and then radiation processing is carried out according to the dose of 7.5MeV to prepare the high-density polyethylene base material.
65% of modified polyethylene material (the melt index is 14g/10min, the grafting rate of maleic anhydride is 1.2%) as raw material of polyolefin adhesive, 22% of ethylene-ethylene ethyl acrylate-maleic anhydride terpolymer (the melting point is 110 ℃, the melt index is 200g/10min, and the content of maleic anhydride is 2.8%), 10% of ethylene propylene diene monomer, 1.5% of carbon black and 10101.5% of antioxidant are extruded and coated on the surface of a radiation crosslinking polyethylene base material through a double-screw extrusion production line to prepare the polyethylene composite belt, wherein the extrusion coating temperature is 170-220 ℃.
Example 3
According to the mass percentage, the base material is high-density polyethylene (density is 0.94 g/cm)3Shore hardness D = 61) 45%, low-density polyethylene (melt index 1.2g/10 min) 40%, ethylene propylene diene monomer 10%, carbon black 2.0%, antioxidant 10102.5% and ultraviolet stabilizer 0.5%, extruding and molding by a double-screw extrusion molding production line, wherein the extrusion temperature is 160-200 ℃, and then radiation processing is carried out according to the dose of 8MeV to prepare the high-density polyethylene base material.
70% of modified polyethylene material (PE-g-MAH) (the melt index is 14g/10min, and the grafting rate of maleic anhydride is 1.2%) as a raw material of a polyolefin adhesive, 15% of ethylene-ethylene ethyl acrylate-maleic anhydride terpolymer (the melting point is 110 ℃, the melt index is 40g/10min, and the content of maleic anhydride is 2.8%), 12% of ethylene propylene diene monomer, 1.5% of carbon black and 10101.5% of antioxidant are extruded and coated on the surface of a radiation crosslinking polyethylene base material through a double-screw extrusion production line to prepare a polyethylene composite belt, wherein the extrusion coating temperature is 170-220 ℃.
Comparative example 1
According to the mass percentage, the base material is high-density polyethylene (density is 0.94 g/cm)370 percent of Shore D hardness = 61), 20 percent of low-density polyethylene (the melt index is 1.2g/10 min), 5 percent of ethylene propylene diene monomer, 2.0 percent of carbon black, 10102.5 percent of antioxidant and 0.5 percent of ultraviolet stabilizer, and the high-density polyethylene base material is prepared by extrusion molding through a double-screw extrusion molding production line, wherein the extrusion temperature is 160-200 ℃, and then radiation processing is carried out according to the dose of 8 MeV.
70% of modified polyethylene material (PE-g-MAH) (the melt index is 14g/10min, and the grafting rate of maleic anhydride is 1.2%) as a raw material of a polyolefin adhesive, 15% of ethylene-ethylene ethyl acrylate-maleic anhydride terpolymer (the melting point is 110 ℃, the melt index is 40g/10min, and the content of maleic anhydride is 2.8%), 12% of ethylene propylene diene monomer, 1.5% of carbon black and 10101.5% of antioxidant are extruded and coated on the surface of a radiation crosslinking polyethylene base material through a double-screw extrusion production line to prepare a polyethylene composite belt, wherein the extrusion coating temperature is 170-220 ℃.
Comparative example 2
According to the mass percentage, the base material is high-density polyethylene (density is 0.94 g/cm)3Shore hardness D = 61) 45%, low-density polyethylene (melt index 1.2g/10 min) 40%, ethylene propylene diene monomer 10%, carbon black 2.0%, antioxidant 10102.5% and ultraviolet stabilizer 0.5%, extruding and molding by a double-screw extrusion molding production line, wherein the extrusion temperature is 160-200 ℃, and then radiation processing is carried out according to the dose of 8MeV to prepare the high-density polyethylene base material.
50% of modified polyethylene material (PE-g-MAH) (the melt index is 14g/10min, and the grafting rate of maleic anhydride is 1.2%) as a raw material of a polyolefin adhesive, 20% of ethylene-ethylene ethyl acrylate-maleic anhydride terpolymer (the melting point is 110 ℃, the melt index is 40g/10min, and the content of maleic anhydride is 2.8%), 27% of ethylene propylene diene monomer, 1.5% of carbon black and 10101.5% of antioxidant are extruded and coated on the surface of a radiation crosslinking polyethylene base material through a double-screw extrusion production line to prepare a polyethylene composite belt, wherein the extrusion coating temperature is 170-220 ℃.
The performance tests were performed on the radiation crosslinked polyethylene composite tapes of examples 1 to 3 and comparative examples 1 to 2, and the results are shown in table 1 below:
table 1:
remarking: the mechanical properties were tested according to GB/T1040, GB/T7124, and the adhesive properties were tested according to GB/T2790, SY/T0315.
From the data in Table 1, it can be seen that from examples 1-3 and comparative examples 1-2, too high a content of high density polyethylene leads to a decrease in room temperature tensile strength, while the amount of modified polyethylene material, ethylene-ethylene ethyl acrylate-maleic anhydride terpolymer, decreases, leading to a deterioration in adhesive properties and a deterioration in peel strength. Therefore, the balance between the reasonable amount of the high density polyethylene substrate and the polyolefin adhesive is needed to obtain the best mechanical properties of the radiation crosslinked polyethylene composite tape of the present invention.
Furthermore, the radiation cross-linked polyethylene composite strip obtained on the basis has proper strength, is suitable for winding the composite strip on the surface of a bent pipe rotating along the curvature radius of the bent pipe by using a winding machine, is more suitable for mechanical winding processing in factories, overcomes the defect that the anticorrosion forms of other bent pipes are not matched with the common 3LPE of a straight pipe, realizes the consistency of the anticorrosion quality of the bent pipe and the straight pipe, and greatly improves the anticorrosion performance and the reliability.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a bury anticorrosive compound area of radiation cross-linking polyethylene of ground steel return bend which characterized in that:
the radiation crosslinking polyethylene composite belt is composed of a double-layer structure, wherein one layer is a high-density polyolefin substrate layer subjected to radiation crosslinking, and the other layer is a polyolefin adhesive layer;
the radiation crosslinked high-density polyolefin substrate layer comprises the following components in percentage by mass: 40-60% of high-density polyethylene, 20-40% of low-density polyethylene, 5-15% of polyolefin elastomer, 1-3% of carbon black, 0.5-2% of first antioxidant and 0.5-2% of ultraviolet stabilizer;
the polyolefin adhesive layer comprises the following components in percentage by mass: 60-70% of polyethylene modified material, 10-30% of ethylene-ethylene ethyl acrylate-maleic anhydride terpolymer, 5-15% of ethylene propylene diene monomer rubber, 1-3% of carbon black and 0.5-2% of second antioxidant.
2. The radiation cross-linked polyethylene composite belt for corrosion prevention of the buried steel elbow pipe according to claim 1, wherein: the density of the high-density polyethylene is between 0.94 and 0.96g/cm3The Shore hardness D is more than or equal to 60.
3. The radiation cross-linked polyethylene composite belt for corrosion prevention of the buried steel elbow pipe according to claim 1, wherein: the low-density polyethylene has a melt index of 1-3g/10 min.
4. The radiation cross-linked polyethylene composite belt for corrosion prevention of the buried steel elbow pipe according to claim 1, wherein: the polyolefin elastomer is one or two selected from ethylene-octene copolymer and ethylene propylene diene monomer.
5. The radiation cross-linked polyethylene composite belt for corrosion prevention of the buried steel elbow pipe according to claim 1, wherein: the polyethylene modified material is low-density polyethylene grafted maleic anhydride modified material, the melt index is 5-20g/10min, and the grafting rate of maleic anhydride is 0.8-1.5%.
6. The radiation cross-linked polyethylene composite belt for corrosion prevention of the buried steel elbow pipe according to claim 1, wherein: the ethylene-ethylene ethyl acrylate-maleic anhydride terpolymer has a melting point of more than or equal to 100 ℃, a melt index of 40-200g/10min and a maleic anhydride content of 1.5-3%.
7. The radiation cross-linked polyethylene composite belt for corrosion prevention of the buried steel elbow pipe according to claim 1, wherein: the ethylene component content of the ethylene propylene diene monomer is 65-75%.
8. The radiation cross-linked polyethylene composite belt for corrosion prevention of the buried steel elbow pipe according to claim 1, wherein: the first antioxidant is selected from antioxidant 1010 or antioxidant 1076, and combinations thereof; the ultraviolet stabilizer is selected from UV-944; the second antioxidant is antioxidant 1010.
9. The preparation method of the radiation cross-linked polyethylene composite belt for corrosion prevention of the buried steel elbow pipe according to any one of claims 1 to 8, characterized by comprising the following steps: the preparation method mainly comprises two procedures, including a high-density polyethylene base material processing and preparation procedure and a high-density polyethylene composite belt coating and processing and preparation procedure;
the processing and preparation procedures of the high-density polyethylene substrate comprise the following steps: proportionally enabling the base material raw materials to pass through a double-screw extrusion production line, carrying out melt extrusion processing and forming, wherein the extrusion temperature is 160-200 ℃, preparing a high-density polyethylene base material sheet according to the required thickness and width, and rolling; then sending the high-density polyethylene base material to an irradiation center, carrying out electron radiation crosslinking processing, and rolling for later use;
the coating processing preparation procedures of the high-density polyethylene composite belt comprise the following steps: and (3) heating, melting and extruding the raw materials of the adhesive layer into sheets by a double-screw extrusion production line according to a certain proportion, coating the sheets on the surface of the high-density polyethylene base material by three-roller rolling, and then cooling, slitting and rolling.
10. The preparation method of the radiation cross-linked polyethylene composite belt for corrosion prevention of the buried steel elbow pipe according to claim 9, characterized by comprising the following steps: the high-density polyethylene base material is subjected to irradiation processing by an electron radiation accelerator, and the irradiation processing dose is 7-9 MeV; in the coating processing and preparation procedure of the high-density polyethylene composite tape, the extrusion temperature is 170-220 ℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113583327A (en) * | 2021-08-26 | 2021-11-02 | 济宁迅大管道防腐材料有限公司 | Polyethylene anticorrosive coating elbow pipe anticorrosive belt for buried steel pipeline |
| CN114087433A (en) * | 2021-10-12 | 2022-02-25 | 广州中燃城市燃气发展有限公司 | A anticorrosive pipeline for natural gas |
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| CN114087433A (en) * | 2021-10-12 | 2022-02-25 | 广州中燃城市燃气发展有限公司 | A anticorrosive pipeline for natural gas |
| CN114087433B (en) * | 2021-10-12 | 2024-04-16 | 广州中燃城市燃气发展有限公司 | Corrosion-resistant pipeline for natural gas |
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