CN-121989506-A - Multi-layer composite fireproof carbon fiber pipeline suitable for offshore platform and preparation method thereof

CN121989506ACN 121989506 ACN121989506 ACN 121989506ACN-121989506-A

Abstract

The invention provides a multi-layer composite fireproof carbon fiber pipeline suitable for an offshore platform and a preparation method thereof, and relates to the technical field of composite pipeline preparation, wherein the multi-layer composite fireproof carbon fiber pipeline comprises an inner layer, an intermediate layer and an outer layer, the inner layer is a carbon fiber reinforced polymer layer, the intermediate layer is a graphene reinforced fireproof layer, and the outer layer is a corrosion-resistant polymer coating; the inner layer comprises bio-based carbon fiber cloth and bio-based epoxy resin, the middle layer comprises bio-based epoxy resin, a fireproof additive and a filler, and the outer layer comprises a base polymer, a reinforcing filler and an anti-corrosion additive. The invention has the beneficial effects of improving the corrosion resistance of the pipeline, effectively prolonging the service life of the pipeline and improving the safety and fireproof property.

Inventors

ZHU KEHAI
LI QIANG
ZHAO YING
CHEN YUMING
MA YANRONG
GAO SHENG
WANG HONGJUN

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司胜利油田分公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. A multi-layer composite fireproof carbon fiber pipeline suitable for offshore platforms is characterized by comprising The inner layer is a carbon fiber reinforced polymer layer, the middle layer is a graphene reinforced fireproof layer, and the outer layer is a corrosion-resistant polymer coating; The inner layer comprises bio-based carbon fiber cloth and bio-based epoxy resin; The interlayer comprises graphene nano sheets and fireproof resin, wherein the fireproof resin comprises bio-based epoxy resin, fireproof additive and filler; The outer layer includes a base polymer, a reinforcing filler, and a preservative additive.
2. The multi-layer composite fire-resistant carbon fiber pipeline suitable for offshore platforms according to claim 1, wherein the weight ratio of the bio-based carbon fiber cloth to bio-based epoxy resin of the inner layer is 50-60:40-50; The fireproof resin comprises 53-65% of bio-based epoxy resin, 25-35% of fireproof additive and 10-14% of filler, wherein the fireproof additive is aluminum phosphate, and the filler is silicon particles; the outer layer comprises 64-74% of base polymer, 18-26% of reinforcing filler and 8-10% of preservative additive, wherein the base polymer is polyurethane, the reinforcing filler is nano silicon particles, and the preservative additive is zinc powder.
3. The method for preparing the multi-layer composite fireproof carbon fiber pipeline suitable for the offshore platform according to claim 1, which comprises the steps of preparing an inner layer: Step A, preparing bio-based carbon fiber and bio-based epoxy resin; Step B, attaching a bio-based carbon fiber cloth layer pre-impregnated in epoxy resin to a pipeline mould according to design arrangement; step C, curing the laminated carbon fiber under the control of temperature; comprises the preparation of an intermediate layer: step A, mixing graphene nano sheets with fireproof resin; step B, pretreatment of the inner layer surface; Step C, uniformly coating the surface of the cured inner layer with the graphene reinforced fireproof layer by adopting a spraying or brushing technology; Comprises the steps of preparing an outer layer: step A, preparing a corrosion-resistant and high-elasticity polymer mixture; Step B, surface pretreatment of the intermediate layer; And C, coating a polymer coating on the intermediate layer in a spraying mode.
4. The method for preparing the multi-layer composite fireproof carbon fiber pipeline suitable for the offshore platform according to claim 3, wherein the inner layer preparation step A comprises the steps of: a, fermenting corn sugar to obtain ethanol; b, extracting ethanol from the fermentation broth by a distillation method, heating the purified ethanol, and adding an aluminum oxide catalyst to generate ethylene gas; c, purifying the generated ethylene gas; d reacting ethylene with hydrogen cyanide at high temperature and pressure using a copper-based catalyst to produce acrylonitrile; e, converting the acrylonitrile monomer into polyacrylonitrile by free radical polymerization; f converting the bio-based PAN into fibers by wet spinning, and heating the PAN fibers to 250-300 ℃ in air to stabilize the PAN fibers; heating the stabilized fiber to above 1000 ℃ in an inert gas environment to carbonize the fiber; h, carrying out surface treatment and stretching on the carbonized fiber; the preparation method of the bio-based epoxy resin comprises the following steps: a, reacting soybean oil with hydrogen peroxide under the action of a catalyst formic acid to generate epoxidized soybean oil; b, mixing epoxidized soybean oil and ethylene oxide to react to form a prepolymer; c, adding a curing agent into the prepolymer for curing.
5. The method for preparing a multi-layer composite fire-resistant carbon fiber pipe suitable for use on an offshore platform according to claim 4, wherein the inner layer preparing step B comprises: a, cutting the carbon fiber cloth by using the obtained bio-based carbon fiber cloth with the thickness of 0.15-0.25mm, so that the length of the carbon fiber cloth is matched with the length of a pipeline; b, putting the cut carbon fiber cloth into resin; c, removing redundant resin and ensuring uniform resin distribution; And d, winding the carbon fiber cloth impregnated with the resin on a die in sequence, and arranging the carbon fiber cloth in different directions in an alternating manner including 0 degree (longitudinal direction), 45 degrees and 90 degrees (transverse direction).
6. The method for preparing a multi-layered composite fire-resistant carbon fiber pipe for offshore platform according to claim 3, wherein the inner layer preparing step C comprises: a, placing the impregnated carbon fiber into a vacuum environment, and pumping out air; b, solidifying under the controlled temperature and pressure, wherein the pressure range is 0.7-1.4MPa, the solidifying temperature is 120-180 ℃, the solidifying time is 2-4h, and after the solidifying is completed, slowly cooling to room temperature; c, after the solidification is finished, taking out the pipeline, carrying out post-treatment, and polishing the surface.
7. The method for preparing a multi-layered composite fire-resistant carbon fiber pipe suitable for use on an offshore platform according to claim 3, wherein the intermediate layer preparing step a comprises: Uniformly mixing the bio-based epoxy resin, the fireproof additive and the filler which are obtained by the same preparation method as the inner layer with the graphene nano sheet by using a high shear mixer for 30min so as to ensure full mixing, wherein the rotating speed is 2000-3000rpm; b, placing the mixed materials in a vacuum deaeration machine, and controlling the vacuum degree to be-0.1 MPa for 15min.
8. The method for preparing a multi-layered composite fire-resistant carbon fiber pipe for offshore platform according to claim 3, wherein the intermediate layer preparing step B comprises: a, cleaning the surface of the pipeline; b lightly sanding the inner surface of the pipe; c, sanding by using sand paper with proper granularity, and cleaning dust on the surface by using clean cloth or an air gun after sanding; d final cleaning of the sanded and treated surface using a nonwoven fabric and a small amount of a surface treatment agent such as a silane coupling agent; The intermediate layer preparation step C comprises the following steps: a, spraying the mixed material to the outer surface of the inner layer, wherein the thickness of the mixed material is 0.5-1mm; b curing for 24h at room temperature.
9. The method for preparing a multi-layered composite fire-resistant carbon fiber pipe for offshore platform according to claim 3, wherein the outer layer preparation step a comprises: a, mixing a base polymer, a reinforcing filler and a preservative additive for 20 minutes; b, placing the mixture in a vacuum deaeration machine to remove bubbles, wherein the vacuum degree is controlled to be 0-0.1MPa, and the duration is 10 minutes.
10. The method for preparing a multi-layered composite fire-resistant carbon fiber pipe for offshore platform according to claim 3, wherein the outer layer preparation step B comprises: a, lightly sanding the surface of the pipeline; b, cleaning dust on the surface by using clean cloth or an air gun after polishing; c, finally cleaning the treated surface by using non-woven fabrics and a proper amount of acetone or isopropanol solvent; The outer layer preparation step C comprises the following steps: a, spraying by using an air spray gun, wherein the thickness of the coating is 0.3-0.5mm; b naturally curing at room temperature for 24 hours.

Description

Multi-layer composite fireproof carbon fiber pipeline suitable for offshore platform and preparation method thereof Technical Field The invention relates to the technical field of composite pipeline preparation, in particular to a multilayer composite fireproof carbon fiber pipeline suitable for an offshore platform and a preparation method thereof. Background In the field of modern ocean engineering and offshore platform applications, the design and material selection of the piping system is critical. These pipes are commonly used to transport various fluids, including oil, gas, and various chemicals, while also being subject to extreme environmental challenges, such as brine corrosion, high pressures, mechanical stress, and fire risks. Conventional piping systems rely primarily on metallic materials, such as steel and aluminum, but these materials suffer from a number of drawbacks and limitations. Currently, in the prior art, metal pipes are very susceptible to corrosion in marine environments, especially in high salinity waters. Long-term brine exposure can lead to accelerated corrosion of the material, thereby reducing the service life and reliability of the pipeline. The weight of the metallic material is large, which may cause additional structural burden and installation difficulty in offshore platforms and the like. At the same time, high material costs and maintenance costs are another important issue for metal pipes. The maintenance and replacement requirements caused by corrosion and wear add to the long-term operating costs, and metal pipes often lack sufficient flexibility and have limited resistance to shock and vibration, which can be a problem in dynamically changing marine environments. Currently, in the case of fire, metal pipes may not be able to effectively insulate the fire, which is a serious safety hazard for pipes carrying flammable substances. In addition, the production and processing of metal pipes have a significant environmental impact, in particular in terms of energy consumption and carbon emissions. In addition to the above problems, conventional metal pipes have limited flexibility in the design and manufacturing process. Custom requirements for a particular application, such as a particular size or shape, metal tubing may be difficult to meet and costs may increase significantly. How to solve the technical problems is the subject of the present invention. Disclosure of Invention In order to solve the defects in the prior art, the invention provides a multilayer composite fireproof carbon fiber pipeline suitable for an offshore platform and a preparation method thereof. The invention provides a multi-layer composite fireproof carbon fiber pipeline suitable for an offshore platform, which comprises an inner layer, an intermediate layer and an outer layer, wherein the inner layer is a carbon fiber reinforced polymer layer, the intermediate layer is a graphene reinforced fireproof layer, and the outer layer is a corrosion-resistant polymer coating; The inner layer comprises a biobased carbon fiber cloth and biobased epoxy resin, and the weight ratio of the biobased carbon fiber cloth to the biobased epoxy resin of the inner layer is 60:40; The intermediate layer comprises graphene nano sheets and fireproof resin, wherein the fireproof resin comprises 53-65% of bio-based epoxy resin, 25-35% of fireproof additive and 10-14% of filler, the fireproof additive is aluminum phosphate, and the filler is silicon particles; The outer layer comprises 64-74% of a base polymer, 18-26% of a reinforcing filler and 8-10% of a corrosion-resistant additive, wherein the base polymer is polyurethane, the reinforcing filler is nano silicon particles, and the corrosion-resistant additive is zinc powder. A preparation method of a multi-layer composite fireproof carbon fiber pipeline suitable for an offshore platform comprises the following steps of: step A, preparing a bio-based carbon fiber and a bio-based epoxy resin, wherein the preparation of the bio-based carbon fiber comprises the following steps: Fermenting corn sugar, adding yeast into the mixed solution, adding 1-5g of dry yeast per liter of medium, maintaining the temperature at 30 ℃ and the pH value at 4-6, ensuring the stability of a fermentation environment, and fermenting under anaerobic conditions for 24-48 hours to obtain ethanol; b extracting ethanol from the fermentation broth by a distillation method, heating the purified ethanol to 300-350 ℃, and adding an aluminum oxide catalyst accounting for 1-5% of the weight of the ethanol to generate ethylene gas; c, purifying the generated ethylene gas; d reacting ethylene with hydrogen cyanide at a high temperature of 200-300 ℃ and a pressure, wherein the molar ratio of hydrogen cyanide to ethylene is 1:1-1.5:1, and a copper-based catalyst with the weight of ethylene being 0.1-1% is used to produce acrylonitrile; e, converting the acrylonitrile monomer into polyacrylonitrile by free radica