CN109882664B - Steel strip reinforced helical bellows and production process thereof - Google Patents
Steel strip reinforced helical bellows and production process thereof Download PDFInfo
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Abstract
The invention relates to a steel strip reinforced helical bellows and a production process thereof, wherein a polyethylene inner layer and a polyethylene outer layer both comprise the following components of HDPE, carbon nano tubes, epoxidized soybean oil, aluminum nitride, a dispersing agent, a lubricating agent, a defoaming agent, a coupling agent, an antioxidant and black master batch; the black master batch comprises the following components of HDPE, active calcium, a dispersing agent, a lubricating agent, a toughening agent and carbon black. The preparation process comprises the following steps: steel strip texturing treatment, coating an adhesive resin layer on the surface, respectively preparing black master and adhesive resin, firstly extruding a polyethylene inner layer, then placing the steel strip on the polyethylene inner layer, then mixing the components of the polyethylene outer layer, granulating, and then extruding the polyethylene outer layer to be compounded on the steel strip. The material component selection of interior, skin is unanimous, and the substrate of bonding resin layer is unanimous with inlayer and outer substrate, has improved the condition of the layering that appears in the later stage of using, and has improved the carbonization that the processing condition of different materials caused and influence the inhomogeneous condition of material performance.
Description
Technical Field
The invention relates to the technical field of underground water pipes, in particular to a steel strip reinforced spiral corrugated pipe and a production process thereof.
Background
The steel band reinforced polyethylene spiral corrugated pipe is a structural wall pipe which takes high-density polyethylene as a matrix, takes a wave shape formed by a steel band coated with adhesive resin on the surface as a main supporting structure, and is wound and compounded with polyethylene materials into a whole. The steel strip reinforced polyethylene corrugated pipe well combines the high rigidity and high strength of steel and the flexibility, corrosion resistance, abrasion resistance and other properties of polyethylene, can meet the application requirements of various projects, is widely applied to the fields of freeways, urban municipal drainage engineering construction and the like, and is particularly applied to large-scale basic engineering projects requiring long service life.
Chinese patent publication No. CN108976562A discloses a polyethylene double-wall corrugated pipe and a preparation method thereof. The structure of the composite material comprises an inner layer and an outer layer, wherein the inner layer comprises 30-40 parts of polyethylene, 5-10 parts of thermoplastic polyurethane, 3-8 parts of calcium carbonate powder, 3-5 parts of a coupling agent, 1-3 parts of a dispersing agent and 1-2 parts of a lubricating agent; the outer layer comprises 60-70 parts of polyethylene, 10-15 parts of terpene resin, 2-5 parts of calcium carbonate powder, 6-8 parts of coupling agent, 2-3 parts of dispersing agent and 1-2 parts of lubricating agent.
The polyethylene double-wall corrugated pipe claimed in this document provides the inner pipe with a certain corrosion resistance by adding thermoplastic polyurethane to the inner pipe, while adding terpene resin to the outer pipe increases the rigidity of the outer pipe. However, in extrusion molding, the calcium carbonate powder is directly mixed with the resin, so that uneven dispersion is likely to occur, and even if the dispersant is added, the calcium carbonate powder may agglomerate, which affects the quality of the corrugated pipe.
Disclosure of Invention
The invention aims to provide a steel strip reinforced spiral corrugated pipe which is uniform in component mixing and good in corrugated pipe performance.
The above object of the present invention is achieved by the following technical solutions:
a steel strip reinforced spiral corrugated pipe sequentially comprises a polyethylene inner layer, a steel strip layer and a polyethylene layer outer layer from inside to outside, wherein a bonding resin layer is coated on the surface of the steel strip layer;
the polyethylene inner layer and the polyethylene outer layer respectively comprise the following components of HDPE, carbon nano tubes, epoxidized soybean oil, aluminum nitride, a dispersing agent, a lubricating agent, a defoaming agent, a coupling agent, an antioxidant and black master batch;
the black master batch comprises the following components of HDPE, active calcium, a dispersing agent, a lubricating agent, a toughening agent and carbon black.
By adopting the technical scheme, in the components of the polyethylene inner layer and the polyethylene outer layer, HDPE is high-density polyethylene, and the hardness, tensile strength and creep property of the HDPE are superior to those of low-density polyethylene; the wear resistance, the electrical insulation, the toughness and the cold resistance are good, the chemical stability is good, the permeability to water vapor and air is small, and the water absorption is low; the ageing resistance is poor, the environmental stress cracking resistance is inferior to that of low density polyethylene, and the thermal oxidation in particular reduces the performance. Therefore, carbon nanotubes are also added in the application document, and the carbon nanotubes are compounded with HDPE materials, so that the composite material has good strength, elasticity, fatigue resistance and isotropy.
The epoxidized soybean oil has excellent thermal stability and light stability, water resistance and oil resistance, can endow products with good mechanical strength, weather resistance and electrical property, and has the advantages of small volatility, low migration, heat resistance, light resistance and weather resistance.
The aluminum nitride is used in the raw materials of the corrugated pipe, and can play the roles of shearing resistance and tearing resistance.
The base material in the black master batch is HDPE, and can be well fused with components of a polyethylene inner layer or a polyethylene outer layer, so that the dispersion uniformity of carbon black is realized.
In order to improve the dispersion stability among the components and realize the stable performance of a final product, the black master batch is prepared into the color master batch, when the corrugated pipe is prepared, carbon black and active calcium in the color master batch can be uniformly distributed in the components, the base material of the black master batch is consistent with the aggregate of the inner polyvinyl chloride layer and the outer polyvinyl chloride layer, HDPE is selected, the dispersion among the components is uniform according to a similar compatibility principle, and the condition that the performance of the material is non-uniform due to carbonization in the processing process is avoided.
The invention is further configured to: in the inner polyvinyl chloride layer and the outer polyethylene layer, the dispersing agent is at least one of polyethylene wax, magnesium stearate, calcium stearate and zinc stearate; the lubricant is at least one of oleic acid amide, polyethylene wax and stearic acid amide; the coupling agent is at least one of silane coupling agent and phthalate coupling agent;
in the black master batch, the dispersing agent is at least one of polyethylene wax, magnesium stearate, calcium stearate and zinc stearate; the lubricant is at least one of oleic acid amide, polyethylene wax and stearic acid amide; the toughening agent is styrene-butadiene thermoplastic elastomer, ethylene propylene rubber or ethylene-vinyl acetate copolymer.
By adopting the technical scheme, the dispersing agent in the inner polyvinyl chloride layer and the outer polyvinyl chloride layer can improve the dispersion uniformity among the components and reduce the occurrence of deposition or agglomeration.
The lubricant can improve the fluidity of the polymer system corrugated pipe, weaken the adhesion of the polymer to a cylinder and a die and the friction and abrasion, prevent and reduce the retention, and improve the appearance and the gloss of the corrugated pipe product during the basic molding processing.
The coupling agent can firmly combine two materials which have different properties and are not easy to combine originally through chemical and physical actions.
The toughening agent can increase the flexibility of the adhesive film layer. Reduce brittleness and increase toughness.
The invention is further configured to: the bonding resin comprises the following components of HDPE, polyurethane resin, terpene resin, acrylic acid, filler and lubricant.
By adopting the technical scheme, the base material in the bonding resin component also comprises HDPE, and the base material has good crosslinking performance with the inner layer and the outer layer during action.
The invention is further configured to: the filler in the bonding resin is one of nano titanium dioxide and calcium carbonate whiskers; the lubricant is one of oleic acid amide, polyethylene wax and stearic acid amide.
By adopting the technical scheme, the cost can be reduced by adding the specific filler; the addition of a lubricant improves the dispersion properties of the components.
The invention is further configured to: the steel strip reinforced corrugated pipe comprises the following components in parts by weight,
the polyethylene layer comprises 170 parts of HDPE 120-one, 3-5 parts of carbon nano tubes, 5-10 parts of epoxidized soybean oil, 5-10 parts of aluminum nitride, 10-15 parts of dispersing agent, 5-10 parts of lubricating agent, 10-20 parts of defoaming agent, 5-10 parts of coupling agent, 5-10 parts of antioxidant and 15-20 parts of black master batch;
the black master batch comprises 30-50 parts of HDPE, 50-70 parts of active calcium, 2-5 parts of dispersant, 2-5 parts of lubricant, 3-5 parts of flexibilizer and 5-10 parts of carbon black;
the adhesive resin comprises 55-60 parts of HDPE, 10-20 parts of polyurethane resin, 3-5 parts of terpene resin, 50-60 parts of acrylic acid, 15-20 parts of filler and 1-3 parts of lubricant.
By adopting the technical scheme, the content of the specific component materials is selected within the range, and the finally prepared corrugated pipe has strong comprehensive performance and uniform performance.
The second invention aims to provide a production process of the steel strip reinforced spiral corrugated pipe, and the prepared corrugated pipe has excellent performance.
The second aim of the invention is realized by the following technical scheme: comprises the following preparation steps:
step 1: carrying out texturing treatment on the steel strip, and coating an adhesive resin layer on the surface of the steel strip under a heating condition for later use;
step 2: respectively preparing black master and bonding resin for later use;
and step 3: firstly, extruding a polyethylene inner layer, then placing a steel belt on the polyethylene inner layer, then mixing the components of the polyethylene outer layer, granulating, and then extruding the polyethylene outer layer and compounding the polyethylene outer layer on the steel belt to obtain the steel belt reinforced spiral corrugated pipe.
By adopting the technical scheme, the process from step 1 to step 3 can complete the preparation of the steel strip reinforced corrugated pipe.
The invention is further configured to: the steel strip texturing treatment in step 1 comprises the following steps,
s1, carrying out laser treatment on the surface of the steel strip to form a concave-convex structure;
s2, cleaning oil stains on the surface of the steel strip by using the cleaning liquid;
s3, heating the steel strip after cleaning;
and S4, galvanizing the surface of the steel strip, and drying after galvanizing.
By adopting the technical scheme, the steel belt is subjected to texturing treatment, so that the tightness of the connection between the steel belt and the inner layer and the outer layer can be enhanced; and secondly, the concave-convex structure formed in the preparation process can further improve the connection stability among components in the concave-convex structure, the surface oil stain removal treatment and the galvanization.
The invention is further configured to: the cleaning liquid medicine in the S2 comprises, by weight, 20-25% of sodium hydroxide, 5-20% of sodium carbonate, 10-20% of sodium bicarbonate and 15-40% of sodium molybdate.
By adopting the technical scheme, the added sodium hydroxide can play a role in neutralizing oil stains. The addition of sodium molybdate can further enhance the stability of the zinc coating.
In conclusion, the beneficial technical effects of the invention are as follows:
1. in the component selection of the steel strip reinforced spiral corrugated pipe in the application document, the material components of the inner layer and the outer layer are selected consistently, and the base material of the bonding resin layer is consistent with the base materials of the inner layer and the outer layer, so that the layering condition in the later use stage is improved, and the condition that the carbonization influences the material performance non-uniformly due to different processing conditions of different materials is improved;
HDPE has poor aging resistance and environmental stress cracking resistance when being used, which is not improved in the application document, and the existence of the carbon nano tube is added into the components, so that the strength of the corrugated pipe is enhanced;
3. the operation of galvanizing the surface of the steel strip enhances the bonding firmness of the steel strip and the bonding resin.
Detailed Description
Example 1
The steel strip reinforced spiral corrugated pipe comprises the following components in parts by weight:
the polyethylene layer comprises 120kg of HDPE120kg, 3kg of carbon nano tube, 5kg of epoxidized soybean oil, 5kg of aluminum nitride, 10kg of dispersing agent, 5kg of lubricating agent, 10kg of defoaming agent, 5kg of coupling agent, 10kg of antioxidant and 15kg of black master batch.
The production process of the corrugated pipe comprises the following steps:
step 1: carrying out texturing treatment on the steel strip, and coating an adhesive resin layer on the surface of the steel strip under a heating condition for later use;
step 2: respectively preparing black master and bonding resin for later use;
and step 3: the method comprises the steps of firstly extruding the mixture by an extruder to form a polyethylene inner layer, then placing a steel belt on the polyethylene inner layer, mixing the components of the polyethylene outer layer, granulating, extruding the polyethylene outer layer and compounding the polyethylene outer layer on the steel belt, and thus obtaining the steel belt reinforced spiral corrugated pipe.
The steel strip roughening treatment in step 1 comprises the following steps,
s1, carrying out laser treatment on the surface of the steel strip to form a concave-convex structure;
s2, cleaning oil stains on the surface of the steel strip by using the cleaning liquid; the medicinal liquid comprises 30% sodium hydroxide and 15% sodium hydroxide
Ammonium carbonate, 15% sodium bicarbonate, 40% sodium molybdate;
s3, heating the steel strip after cleaning, wherein the heating temperature is 300 ℃;
s4, galvanizing the surface of the steel strip, adding the heated steel strip into a zinc solution at 440 ℃, soaking for 30S, wherein the galvanizing components are as follows: 230g/L of sodium hydroxide, 15g/L of zinc oxide, 15g/L of brightening agent, 1.8g/L of chromic anhydride, 1.5g/L of hydrogen fluoride, 5mL/L of nitric acid and 2mL/L of sulfuric acid, and drying by blowing after galvanization for later use.
The black master batch comprises 30kg of HDPE30kg, 50kg of active calcium, 2kg of dispersant, 2kg of lubricant, 3kg of toughening agent and 5kg of carbon black.
The preparation process of the black master batch comprises the following steps: HDPE, active calcium, a dispersant, a lubricant, a flexibilizer and carbon black are uniformly mixed and then melted, extruded and granulated, and the temperature of an extruder is controlled within a range of 190-200 ℃ in the extrusion process.
The bonding resin comprises 55kg of HDPE, 10kg of polyurethane resin, 3kg of terpene resin, 50kg of acrylic acid, 15kg of filler and 1kg of lubricant.
The sticky resin is prepared by uniformly mixing HDPE, polyurethane resin, terpene resin, acrylic acid, filler and lubricant, and heating and melting at 200 deg.C.
Examples 2 to 10 differ from example 1 in the amount of the components, see in particular Table 1
Table 1 compositions of contents of polyethylene inner/outer layers and adhesive resins of examples 1 to 10.
Table 2 contents of additives in polyethylene inner/polyethylene outer layers of examples 1-10.
TABLE 3 component contents of adhesive resins of examples 1 to 10
Table 4 component contents of black master batches for examples 1-10
Table 5 component contents of additives for black concentrates of examples 1-10
Table 6 component contents of cleaning solutions of examples 1-10.
Comparative example
Comparative example 1
The difference between the comparative example 1 and the example 1 is that no black master is added in the inner polyethylene layer and the outer polyethylene layer, and 5kg of carbon black and 50kg of active calcium are directly added.
Comparative example 2
Comparative example 2 differs from example 1 in that the inner polyethylene layer and the outer polyethylene layer do not contain carbon nanotubes.
Comparative example 3
Comparative example 3 differs from example 1 in that the inner polyethylene layer and the outer polyethylene layer do not contain epoxidized soybean oil.
Comparative example 4
Comparative example 4 differs from example 1 in that the inner polyethylene layer and the outer polyethylene layer do not contain aluminum nitride.
Comparative example 5
Comparative example 5 differs from example 1 in that the inner polyethylene layer and the outer polyethylene layer do not contain aluminum nitride, epoxidized soybean oil, and carbon nanotubes.
Experimental detection
1. The impact performance, ring stiffness, ring flexibility and oven experimental performance of the double-wall corrugated pipe are tested according to GB/T19472.1-2004.
Ring flexibility: the sample is required to be smooth, has no reverse bending, no fracture and no separation of two walls;
and (3) oven test: no bubble, no delamination, no cracking are required.
TABLE 7 test results of experiments of examples 1 to 10 and comparative examples 1 to 2
| Detecting items | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Impact Performance (TIR)/%) | ≤3 | ≤5 | ≤5 | ≤4 | ≤2 |
| Ring stiffness (KN/m2) | 12.5 | 12.7 | 12.6 | 13.1 | 13.2 |
| Flexibility of the ring | Qualified | Qualified | Qualified | Qualified | Qualified |
| Oven experiment (110 ℃ C.) | Qualified | Qualified | Qualified | Qualified | Qualified |
| Detecting items | Example 6 | Example 7 | Example 8 | Example 9 | Example 10 |
| Impact Performance (TIR)/%) | ≤4 | ≤4 | ≤3 | ≤4 | ≤5 |
| Ring stiffness (KN/m2) | 13.1 | 13.2 | 13.4 | 13.5 | 13.6 |
| Flexibility of the ring | Qualified | Qualified | Qualified | Qualified | Qualified |
| Oven experiment (110 ℃ C.) | Qualified | Qualified | Qualified | Qualified | Qualified |
| Detecting items | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| Impact Performance (TIR)/%) | ≤8 | ≤7 | ≤8 | ≤8 | ≤10 |
| Ring stiffness (KN/m2) | 11.7 | 11.2 | 11.3 | 11.4 | 9.5 |
| Flexibility of the ring | With cracks | With cracks | With cracks | With cracks | Cracking of both walls |
| Oven experiment (110 ℃ C.) | Qualified | With a layer separation | Qualified | Qualified | With a layer separation |
Comparing the experimental results of examples 1-10 with comparative example 1, it can be seen from the above table that mixing carbon black and activated calcium with HDPE, and preparing a black masterbatch in advance can make the toner uniformly distributed, and improve the situation that the performance is affected by the non-uniform distribution.
Comparing the experimental results of examples 1-10 and comparative examples 2-4, it can be clearly shown that the addition of carbon nanotubes, epoxidized soybean oil and aluminum nitride to the composition can improve the properties of the material and enhance the impact resistance and ring stiffness of the HDPE pipe. The applicant can reasonably conclude that the added carbon nanotubes, epoxidized soybean oil and aluminum nitride can enhance the performance of the material.
Continuing to compare the experimental results of examples 1-10 with comparative example 5, it can be shown that the carbon nanotubes, epoxidized soybean oil, and aluminum nitride can interact with each other and can improve the flexibility and rigidity of HDPE. The applicant speculates that the addition of the carbon nanotubes, the epoxidized soybean oil and the aluminum nitride into the components of the polyethylene inner layer and the polyethylene outer layer can mainly improve the cross-linking property among resins and the dispersibility of additives in the components, and finally improve the performance of the material.
EXAMPLES 1-10 grades comparative examples 1-5
The defoaming agent in the polyethylene inner layer/polyethylene outer layer is purchased from a prestressed corrugated pipe defoaming agent in a plastic product factory of Longdao county;
selecting an antioxidant 1010 as the antioxidant;
the silane coupling agent is selected from KH-550, which is purchased from Jincheng administrative trade company, Jinan, Inc.;
phthalate coupling agent 311 is selected.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (6)
1. A steel band reinforcing helical bellows which characterized in that: the polyethylene rubber belt sequentially comprises a polyethylene inner layer, a steel belt layer and a polyethylene layer outer layer from inside to outside, wherein the surface of the steel belt layer is coated with a bonding resin layer;
the polyethylene inner layer and the polyethylene outer layer respectively comprise the following components of HDPE, carbon nano tubes, epoxidized soybean oil, aluminum nitride, a dispersing agent, a lubricating agent, a defoaming agent, a coupling agent, an antioxidant and black master batch;
the black master batch comprises the following components of HDPE, active calcium, a dispersing agent, a lubricating agent, a toughening agent and carbon black; the bonding resin comprises the following components of HDPE, polyurethane resin, terpene resin, acrylic acid, filler and lubricant; the filler in the bonding resin is one of nano titanium dioxide and calcium carbonate whiskers; the lubricant is one of oleic acid amide, polyethylene wax and stearic acid amide.
2. The steel strip reinforced helical bellows of claim 1, wherein: in the inner polyvinyl chloride layer and the outer polyethylene layer, the dispersing agent is at least one of polyethylene wax, magnesium stearate, calcium stearate and zinc stearate; the lubricant is at least one of oleic acid amide, polyethylene wax and stearic acid amide; the coupling agent is at least one of silane coupling agent and phthalate coupling agent;
in the black master batch, the dispersing agent is at least one of polyethylene wax, magnesium stearate, calcium stearate and zinc stearate; the lubricant is at least one of oleic acid amide, polyethylene wax and stearic acid amide; the toughening agent is styrene-butadiene thermoplastic elastomer, ethylene propylene rubber or ethylene-vinyl acetate copolymer.
3. The steel strip-reinforced helical bellows according to any one of claims 1 to 2, wherein: the steel strip reinforced spiral corrugated pipe comprises the following components in parts by weight,
the polyethylene layer comprises 170 parts of HDPE 120-one, 3-5 parts of carbon nano tubes, 5-10 parts of epoxidized soybean oil, 5-10 parts of aluminum nitride, 10-15 parts of dispersing agent, 5-10 parts of lubricating agent, 10-20 parts of defoaming agent, 5-10 parts of coupling agent, 5-10 parts of antioxidant and 15-20 parts of black master batch;
the black master batch comprises 30-50 parts of HDPE, 50-70 parts of active calcium, 2-5 parts of dispersant, 2-5 parts of lubricant, 3-5 parts of flexibilizer and 5-10 parts of carbon black;
the adhesive resin comprises 55-60 parts of HDPE, 10-20 parts of polyurethane resin, 3-5 parts of terpene resin, 50-60 parts of acrylic acid, 15-20 parts of filler and 1-3 parts of lubricant.
4. A process for producing a steel strip-reinforced helical bellows as claimed in claim 3, characterized in that: comprises the following preparation steps:
step 1: carrying out texturing treatment on the steel strip, and coating an adhesive resin layer on the surface of the steel strip under a heating condition for later use;
step 2: respectively preparing black master and bonding resin for later use;
and step 3: firstly, extruding a polyethylene inner layer, then placing a steel belt on the polyethylene inner layer, then mixing the components of the polyethylene outer layer, granulating, and then extruding the polyethylene outer layer and compounding the polyethylene outer layer on the steel belt to obtain the steel belt reinforced spiral corrugated pipe.
5. The process for producing a steel strip-reinforced helical bellows as claimed in claim 4, wherein the steel strip texturing in step 1 comprises the steps of,
s1, carrying out laser treatment on the surface of the steel strip to form a concave-convex structure;
s2, cleaning oil stains on the surface of the steel strip by using the cleaning liquid;
s3, heating the steel strip after cleaning;
and S4, galvanizing the surface of the steel strip, and drying after galvanizing.
6. The process for producing a steel strip reinforced helical bellows as claimed in claim 5, wherein the cleaning solution in S2 comprises, by weight, 30-40% of sodium hydroxide, 10-20% of sodium carbonate, 10-20% of sodium bicarbonate, and 25-40% of sodium molybdate.
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| CN110541976A (en) * | 2019-08-27 | 2019-12-06 | 安徽瑞通塑业有限公司 | Polyethylene steel strip reinforced spiral corrugated pipe and production process thereof |
| CN111004428A (en) * | 2019-12-23 | 2020-04-14 | 海南联塑科技实业有限公司 | Special color master batch for polyethylene water supply pipe and preparation method and application thereof |
| CN112497795A (en) * | 2020-11-11 | 2021-03-16 | 四川文诚管业有限公司 | Production process of high-density polyethylene plastic steel composite winding pipe and winding pipe prepared by production process |
| CN113502011A (en) * | 2021-06-30 | 2021-10-15 | 广西顺通高分子材料科技有限公司 | Steel wire mesh framework corrugated pipe and preparation method thereof |
| CN113462060A (en) * | 2021-07-30 | 2021-10-01 | 安徽豪洋管业科技有限公司 | HDPE double-wall corrugated pipe processing and extruding process |
| CN113878056A (en) * | 2021-09-07 | 2022-01-04 | 瓯亚管业有限公司 | Novel modification formula of steel belt pipe |
| CN114935049B (en) * | 2022-05-24 | 2023-12-12 | 乌鲁木齐联塑科技发展有限公司 | HDPE spiral reinforced composite drain pipe and preparation method thereof |
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| JP2005164031A (en) * | 2003-11-11 | 2005-06-23 | Nippon Techno:Kk | Flexible drain pipe |
| JP2007524531A (en) * | 2004-02-06 | 2007-08-30 | クーパー−スタンダード オートモーティブ、 インコーポレイテッド | Aromatic polyamide tubular material for application in vehicles |
| CN101987395B (en) * | 2009-08-03 | 2013-02-13 | 天津盛象塑料管业有限公司 | Steel belt texturing method for steel belt reinforced polyethylene helical bellow |
| CN102850628B (en) * | 2012-09-18 | 2015-04-22 | 浙江新大塑料管件有限公司 | Carbon-nano-tube-reinforced polyethylene tube |
| CN203215110U (en) * | 2013-04-19 | 2013-09-25 | 辽宁盛象塑料管业有限公司 | Galvanized steel strip enhanced polyethylene helical bellows |
| CN103554614A (en) * | 2013-10-30 | 2014-02-05 | 安徽国通高新管业股份有限公司 | High-hardness corrugated pipe |
| CN204372372U (en) * | 2014-11-24 | 2015-06-03 | 南京国晋塑胶制品有限公司 | Hdpe double-wall corrugated pipe |
| CN105805435A (en) * | 2016-05-30 | 2016-07-27 | 湖北飞歌科技有限公司 | High-density polyethylene (HDPE)-reinforced winding corrugated pipe |
| CN108864540A (en) * | 2018-07-18 | 2018-11-23 | 广西南宁荣威德新能源科技有限公司 | A kind of impact high density polyethylene (HDPE) feed pipe and preparation method thereof |
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Denomination of invention: Steel belt reinforced spiral corrugated pipe and its production technology Effective date of registration: 20220422 Granted publication date: 20201103 Pledgee: Xi'an Science and Technology Financial Service Center Co.,Ltd. Pledgor: SHAANXI FLYING PIPE TECHNOLOGY Co.,Ltd. Registration number: Y2022610000179 |
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