CN113601873A - Preparation method of glass fiber reinforced plastic pipeline - Google Patents
Preparation method of glass fiber reinforced plastic pipeline Download PDFInfo
- Publication number
- CN113601873A CN113601873A CN202110791177.8A CN202110791177A CN113601873A CN 113601873 A CN113601873 A CN 113601873A CN 202110791177 A CN202110791177 A CN 202110791177A CN 113601873 A CN113601873 A CN 113601873A
- Authority
- CN
- China
- Prior art keywords
- winding
- preparing
- resin
- layer
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011152 fibreglass Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000004804 winding Methods 0.000 claims abstract description 63
- 229920005989 resin Polymers 0.000 claims abstract description 40
- 239000011347 resin Substances 0.000 claims abstract description 40
- HTZCNXWZYVXIMZ-UHFFFAOYSA-M benzyl(triethyl)azanium;chloride Chemical compound [Cl-].CC[N+](CC)(CC)CC1=CC=CC=C1 HTZCNXWZYVXIMZ-UHFFFAOYSA-M 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 12
- WFUGQJXVXHBTEM-UHFFFAOYSA-N 2-hydroperoxy-2-(2-hydroperoxybutan-2-ylperoxy)butane Chemical compound CCC(C)(OO)OOC(C)(CC)OO WFUGQJXVXHBTEM-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229920006267 polyester film Polymers 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 13
- 239000004744 fabric Substances 0.000 claims description 13
- 239000003365 glass fiber Substances 0.000 claims description 11
- 239000003822 epoxy resin Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 229920000647 polyepoxide Polymers 0.000 claims description 10
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract description 2
- 239000011527 polyurethane coating Substances 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 239000004593 Epoxy Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/70—Maintenance
- B29C33/72—Cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/76—Cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a preparation method of a glass fiber reinforced plastic pipeline, which comprises the following steps: the invention relates to the technical field of glass steel pipeline preparation, and the method comprises the following steps of cleaning the surface of a core mold, spraying wear-resistant gel coat on the surface of a polyester film, preparing an inner liner layer, preparing an inner winding layer, preparing a sand inclusion layer, preparing an outer winding layer, and curing and finishing; pressing through the compression roller and covering the bubble that produces in with the coating process and eliminating, guarantee the even integrality of inner liner, configuration winding layer resin adds methyl ethyl ketone peroxide and benzyl triethyl ammonium chloride in to epoxy, improves product performance through the synergism between each component, pipeline outside application polyurethane coating can further improve the waterproof corrosion resistance of pipeline, improves the whole life of pipeline, and the practicality of giving people has brought the convenience.
Description
Technical Field
The invention relates to the technical field of glass fiber reinforced plastic pipeline preparation, in particular to a preparation method of a glass fiber reinforced plastic pipeline.
Background
The glass fiber reinforced plastic pipeline is a light, high-strength and corrosion-resistant nonmetal pipeline. The glass fiber with resin matrix weight is wound on a rotating core mold layer by layer according to the technological requirement, and quartz sand is uniformly paved among the fibers at a long distance to serve as a sand inclusion layer. The pipe wall structure is reasonable and advanced, the function of materials can be fully exerted, the rigidity is improved on the premise of meeting the use strength, and the stability and the reliability of the product are ensured. The glass fiber reinforced plastic sand inclusion pipe has the advantages of excellent chemical corrosion resistance, light weight, high strength, no scale formation, strong shock resistance, long service life compared with the common steel pipe, low comprehensive cost, quick installation, safety, reliability and the like, and is accepted by the majority of users.
The glass fiber reinforced plastic pipeline is applied to the industries of petroleum, chemical engineering, drainage and the like. The production development of the glass fiber reinforced plastic pipeline in China is fast, the quantity is long year by year, and the application range and departments are wider and wider, so the demand of the glass fiber reinforced plastic pipeline is increased day by day.
Chinese patent CN107225784A discloses a process for producing glass fiber reinforced plastic pipeline, comprising the following steps: a) the preparation process of the glass fiber reinforced plastic inner liner comprises the following steps: adding a layer of wear-resistant gel coat during the lining manufacture, and particularly spraying the wear-resistant gel coat on the surface of the core mold; b) a winding process: after the lining layer is solidified, soaking the lining layer into a resin groove to soak urea-formaldehyde resin;
the process can be used for preparing the glass fiber reinforced plastic pipeline, but the process flow is simple, the prepared glass fiber reinforced plastic pipeline has the defects of insufficient strength, material waste, low efficiency and the like, and therefore a new production process is urgently needed to be developed to meet the production requirements of people.
Disclosure of Invention
The invention aims to provide a preparation method of a glass fiber reinforced plastic pipeline, and mainly aims to solve the problem of poor production effect of the existing process.
The technical scheme of the invention is that the preparation method of the glass fiber reinforced plastic pipeline comprises the following steps:
s1, cleaning the surface of the core mold to ensure that the surface of the core mold is smooth and free of impurities, and coating a polyester film on the surface of the core mold after cleaning;
s2, spraying wear-resistant gel coat on the surface of the polyester film;
s3, preparing an inner liner: winding a layer of glass fiber surface felt on the outer side of the wear-resistant gel coat, simultaneously uniformly coating lining resin on the core mold, winding a layer of glass fiber surface felt, uniformly coating the lining resin again, winding gridding cloth, and curing after heating;
s4, preparing an inner winding layer: preparing winding layer resin, immersing the untwisted roving into the winding layer resin, and winding the untwisted roving to the outer side of the lining layer;
s5, preparing a sand inclusion layer: mixing quartz sand and resin in proportion to form mortar, winding the mortar to the surface of the inner winding layer through a sand inclusion cloth, and then performing rolling operation;
s6, preparing an outer winding layer: immersing the twistless roving into the winding layer resin and then winding the twistless roving to the outer side of the sand inclusion layer;
s7, curing and finishing: and (4) heating and curing the pipeline obtained in the step (6), and finishing the pipeline port after curing to obtain the glass fiber reinforced plastic pipeline.
Preferably, the preparation method of the winding layer resin comprises the steps of sequentially adding methyl ethyl ketone peroxide and benzyl triethyl ammonium chloride into the epoxy resin, and then stirring to obtain the winding layer resin.
Preferably, the dosage of the methyl ethyl ketone peroxide is 1-3% of the weight of the epoxy resin, and the dosage of the benzyltriethylammonium chloride is 1-2% of the weight of the epoxy resin.
Preferably, the outer wall of the glass pipeline after the correction in step S7 is coated with a polyurethane paint.
Preferably, when the lining resin is applied in step S3, the lining resin is allowed to permeate the entire surface of the core mold without causing coating leakage.
Preferably, when winding the glass fiber surface felt, the gridding cloth and the twistless roving, a press roller is arranged at one side of the core mould to perform pressing and covering work, so that bubbles generated in the resin in the winding and coating process are eliminated.
Preferably, in steps S4 and S6, the winding method is hoop winding or cross winding.
Preferably, in step S3, the tensile strength of the mesh cloth is more than 2.5kg/cm, and the mesh diameter is 0.5-1.0 mm.
Preferably, the curing heating in step S7 is performed by far infrared heating.
Preferably, in the step S3, the content of the lining resin in the glass fiber surface felt is 90-95%.
The invention has the beneficial effects that:
1. according to the invention, the polyester film and the wear-resistant gel coat are added on the core mold, so that the inner liner is prevented from being directly contacted with the core mold, and the later-stage demolding is facilitated;
2. the outer side of the inner liner is coated with the mesh cloth, and air bubbles generated in the coating process are eliminated through press covering of the compression roller, so that the uniform integrity of the inner liner is ensured, and the pipeline strength is improved;
3. preparing winding layer resin, adding methyl ethyl ketone peroxide and benzyltriethylammonium chloride into epoxy resin, and improving the product performance through the synergistic effect of the components;
4. the polyurethane coating is coated on the outer side of the pipeline, so that the waterproof and anti-corrosion performance of the pipeline can be further improved, the overall service life of the pipeline is prolonged, and convenience is brought to people in practicability.
Detailed Description
The present invention will be further described with reference to the following examples.
A preparation method of a glass fiber reinforced plastic pipeline comprises the following steps:
s1, cleaning the surface of the core mold to ensure that the surface of the core mold is smooth and free of impurities, and coating a polyester film with the thickness of 25-35 mu m on the surface of the core mold after cleaning;
s2, spraying wear-resistant gel coat on the surface of the polyester film;
s3, preparing an inner liner: winding a layer of glass fiber surface felt on the outer side of the wear-resistant gel coat, simultaneously uniformly coating lining resin on the core mold, winding a layer of glass fiber surface felt, uniformly coating the lining resin again, enabling the lining resin to permeate the whole core mold surface without missing coating when the lining resin is coated, enabling the content of the lining resin in the glass fiber surface felt to be 90-95%, then winding gridding cloth, enabling the tensile strength of the gridding cloth to be more than 2.5kg/cm, enabling the diameter of a mesh to be 0.5-1.0 mm, and curing after heating;
s4, preparing an inner winding layer: the method comprises the steps of preparing a winding layer resin, wherein the winding layer resin is prepared by sequentially adding methyl ethyl ketone peroxide and benzyl triethyl ammonium chloride into epoxy resin and then stirring to obtain the winding layer resin, wherein the methyl ethyl ketone peroxide is used as a curing agent, the benzyl triethyl ammonium chloride is used as an accelerating agent, the dosage of the methyl ethyl ketone peroxide is 1-3% of the weight of the epoxy resin, the dosage of the benzyl triethyl ammonium chloride is 1-2% of the weight of the epoxy resin, twistless roving is immersed into the winding layer resin and then wound to the outer side of an inner liner, and the winding mode is annular winding or cross winding;
s5, preparing a sand inclusion layer: mixing quartz sand and resin in proportion to form mortar, winding the mortar to the surface of the inner winding layer through a sand inclusion cloth, and then performing rolling operation;
s6, preparing an outer winding layer: immersing the untwisted roving into the winding layer resin and then winding the untwisted roving to the outer side of the sand inclusion layer, wherein the winding mode is circumferential winding or cross winding, and when the glass fiber surface felt, the gridding cloth and the untwisted roving are wound, a press roll is required to be arranged at one side of the core mould for pressing and covering work, so that bubbles generated in the resin in the winding and coating process are eliminated;
s7, curing and finishing: and (4) heating and curing the pipeline obtained in the step (6) by adopting far infrared rays, finishing the pipeline port after curing to obtain the glass fiber reinforced plastic pipeline, and coating polyurethane paint on the outer wall of the glass fiber reinforced plastic pipeline after finishing correction.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The preparation method of the glass fiber reinforced plastic pipeline is characterized by comprising the following steps:
s1, cleaning the surface of the core mold to ensure that the surface of the core mold is smooth and free of impurities, and coating a polyester film on the surface of the core mold after cleaning;
s2, spraying wear-resistant gel coat on the surface of the polyester film;
s3, preparing an inner liner: winding a layer of glass fiber surface felt on the outer side of the wear-resistant gel coat, simultaneously uniformly coating lining resin on the core mold, winding a layer of glass fiber surface felt, uniformly coating the lining resin again, winding gridding cloth, and curing after heating;
s4, preparing an inner winding layer: preparing winding layer resin, immersing the untwisted roving into the winding layer resin, and winding the untwisted roving to the outer side of the lining layer;
s5, preparing a sand inclusion layer: mixing quartz sand and resin in proportion to form mortar, winding the mortar to the surface of the inner winding layer through a sand inclusion cloth, and then performing rolling operation;
s6, preparing an outer winding layer: immersing the twistless roving into the winding layer resin and then winding the twistless roving to the outer side of the sand inclusion layer;
s7, curing and finishing: and (4) heating and curing the pipeline obtained in the step (6), and finishing the pipeline port after curing to obtain the glass fiber reinforced plastic pipeline.
2. The method for preparing a FRP pipeline as claimed in claim 1 wherein the winding layer resin is prepared by adding methyl ethyl ketone peroxide and benzyltriethylammonium chloride to epoxy resin in sequence and stirring to obtain the winding layer resin.
3. The method for preparing the glass fiber reinforced plastic pipeline according to claim 2, wherein the dosage of the methyl ethyl ketone peroxide is 1-3% of the weight of the epoxy resin, and the dosage of the benzyltriethylammonium chloride is 1-2% of the weight of the epoxy resin.
4. The method for preparing a glass reinforced plastic pipeline according to claim 2, wherein the outer wall of the glass reinforced plastic pipeline after being corrected in the step S7 is coated with polyurethane paint.
5. The method of claim 1, wherein the lining resin is applied in step S3 such that the lining resin is impregnated into the entire surface of the core mold without coating leakage.
6. The method of claim 1, wherein a press roller is disposed at one side of the core mold for covering to eliminate bubbles generated in the resin during the winding and coating process when winding the fiber glass surfacing mat, the mesh fabric and the roving.
7. The method of claim 1, wherein the winding manner in steps S4 and S6 is hoop winding or cross winding.
8. The method of claim 1, wherein in step S3, the mesh cloth has a tensile strength of > 2.5kg/cm and a mesh diameter of 0.5-1.0 mm.
9. The method as claimed in claim 1, wherein the curing heating in step S7 is performed by far infrared heating.
10. The method for preparing a FRP pipe as claimed in claim 1 wherein in step S3, the content of lining resin in the fiberglass surfacing mat is 90-95%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110791177.8A CN113601873A (en) | 2021-07-13 | 2021-07-13 | Preparation method of glass fiber reinforced plastic pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110791177.8A CN113601873A (en) | 2021-07-13 | 2021-07-13 | Preparation method of glass fiber reinforced plastic pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113601873A true CN113601873A (en) | 2021-11-05 |
Family
ID=78304580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110791177.8A Pending CN113601873A (en) | 2021-07-13 | 2021-07-13 | Preparation method of glass fiber reinforced plastic pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113601873A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115157717A (en) * | 2022-06-29 | 2022-10-11 | 中化工程沧州冷却技术有限公司 | Production process of glass fiber reinforced plastic pipeline for cooling tower |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109571994A (en) * | 2018-11-30 | 2019-04-05 | 贵州西南管业股份有限公司 | GRP pipe and production technology |
-
2021
- 2021-07-13 CN CN202110791177.8A patent/CN113601873A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109571994A (en) * | 2018-11-30 | 2019-04-05 | 贵州西南管业股份有限公司 | GRP pipe and production technology |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115157717A (en) * | 2022-06-29 | 2022-10-11 | 中化工程沧州冷却技术有限公司 | Production process of glass fiber reinforced plastic pipeline for cooling tower |
| CN115157717B (en) * | 2022-06-29 | 2024-02-09 | 中化工程沧州冷却技术有限公司 | Production process of glass fiber reinforced plastic pipeline for cooling tower |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2017177709A1 (en) | Small-diameter bamboo-wound composite tube and manufacturing method thereof | |
| CN103742732B (en) | A kind of manufacture method of fiber reinforced plastic pipe | |
| CN104896211B (en) | High-performance wood base composite pressure delivery pipe and preparation method | |
| CN102371685A (en) | Process for manufacturing septic tank by using glass fibre reinforced plastic | |
| CN103009729A (en) | Carbon fiber composite, tank and preparation method thereof | |
| CN109571994A (en) | GRP pipe and production technology | |
| CN101117166A (en) | Glass reinforced plastic device for coal chemical industry engineering and method for preparing the same | |
| CN113601873A (en) | Preparation method of glass fiber reinforced plastic pipeline | |
| CN111645343A (en) | Corrosion-resistant high-strength glass fiber reinforced plastic storage tank and production method thereof | |
| CN109680801A (en) | Flitch keel, production equipment and the production method wrapped up based on felt-cloth, fiber | |
| CN107984772A (en) | The processing technology of new glass fibre reinforced plastic | |
| USRE27061E (en) | Method of making a reinforced composite concrete pipe | |
| CN104060767A (en) | Method of industrially preparing steel-continuous-fiber composite bar | |
| CN107721246B (en) | FRP reinforced prestressed steel cylinder concrete pressure pipeline manufacturing process | |
| CN105625791A (en) | Coated composite material pole tower and manufacturing method thereof | |
| CN106592869A (en) | Bamboo composite pipe-steel pipe internal-external constraint concrete composite structure | |
| CN103016857B (en) | A kind of concrete delivery pipe and preparation method thereof | |
| CN104060768A (en) | Industrial preparation method of steel-continuous-fiber composite bar with rib texture | |
| CN204665313U (en) | Bamboo is wound around composite chimney | |
| CN109822932A (en) | A kind of preparation process of glass fiber reinforced plastic sand-inclusion pipeline | |
| CN205664009U (en) | Glass fiber reinforced plastic composite pipe of antidetonation resistance to compression | |
| CN112571821A (en) | Production method of glass fiber reinforced plastic pipe | |
| CN103526880A (en) | Manufacturing method for FRP constraint PVC pipe-steel pipe internal filling concrete fireproof combination column | |
| CN104060766A (en) | Steel-continuous-fiber composite bar for building | |
| CN217500800U (en) | High-strength corrosion-resistant composite rib |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211105 |