High-strength composite steel pipe with flame-retardant coating

Abstract

The utility model discloses a high-strength composite steel pipe with a flame-retardant coating, and belongs to the technical field of composite steel pipes. Comprising a composite steel pipe body, the composite steel pipe body comprises a high-strength metal base pipe layer and a first bonding layer which are sequentially arranged from inside to outside, the metal base pipe layer is made of a duplex stainless steel material and forms an austenite-ferrite duplex structure through solution treatment, the first bonding layer is a modified phenolic resin adhesive, and the second bonding layer is a modified phenolic resin adhesive. The metal base pipe layer is in covalent bond connection through chemical grafting reaction, a flame-retardant and heat-insulating dual-protection system can be formed through the double-layer design of the intumescent flame-retardant layer and the ceramic fiber heat-insulating layer, and when a fire disaster occurs, the intumescent flame-retardant layer is heated to expand to form a carbon barrier, and the ceramic fiber heat-insulating layer further blocks heat transfer, so that the heat-insulating property of the metal base pipe layer is improved. Therefore, the metal base pipe layer is effectively protected, and the fire propagation speed can be greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to composite steel pipe technical field especially relates to a high strength composite steel pipe with flame -retardant coating. BACKGROUND

[0002] As a kind of excellent performance pipe material, composite steel pipe, the advantages of metal steel pipe and other materials are fused, in building, municipal engineering, petroleum chemical industry and many other fields have been extremely widely used.This pipe material not only has the high strength of steel pipe, high toughness, can withstand greater pressure and external force impact, ensure the safe and stable operation of pipeline system, and combined with the corrosion resistance, insulating property and other characteristics of other materials, effectively prolong the service life of pipeline, reduce maintenance cost.

[0003] However, in actual application process, composite steel pipe faces severe fire safety problem, once fire occurs, ordinary composite steel pipe itself does not have flame retardant performance, easily become the channel of fire spread, accelerate the spread speed of fire, bring great threat to personnel life and property safety. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the problems that existing composite steel pipe itself does not have flame retardant performance, easily become the channel of fire spread, accelerate the spread speed of fire, bring great threat to personnel life and property safety, and provides a kind of high strength composite steel pipe with flame -retardant coating.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A kind of high strength composite steel pipe with flame -retardant coating, including composite steel pipe main body, the composite steel pipe main body includes high-strength metal base pipe layer arranged sequentially from inside to outside, the metal base pipe layer adopts duplex stainless steel material, forms austenite-ferrite duplex phase structure by solid solution treatment;

[0007] First bonding layer, the first bonding layer is modified phenol formaldehyde resin adhesive, and is connected by chemical grafting reaction and metal base pipe layer with covalent bond;

[0008] Intumescent flame retardant layer, the intumescent flame retardant layer is composed of acid source, carbon source, gas source and nano enhanced phase, and forms three-dimensional network structure by high-temperature sintering;

[0009] Ceramic fiber heat insulation layer, the ceramic fiber heat insulation layer is composed of mullite fiber and silica aerogel, and is formed into continuous felt structure by needle punching process;

[0010] Second bonding layer, the second bonding layer is polyurethane elastomer adhesive, and is connected with ceramic fiber heat insulation layer by hydrogen bond;

[0011] The protective layer is a cross-linked polyethylene layer, and nano zinc oxide and a hindered amine light stabilizer are added to form a weather-resistant system.

[0012] Preferably, the outer surface of the metal base pipe layer is subjected to shot blasting treatment and silane coupling agent pretreatment to form a micro-nano structure interface layer.

[0013] Preferably, the intumescent flame-retardant layer contains graphene nanosheets to enhance the compactness and high-temperature resistance of the carbon layer structure.

[0014] Preferably, the thickness of the ceramic fiber thermal insulation layer matches the wall thickness of the metal base pipe layer to form an effective thermal resistance barrier.

[0015] Preferably, the protective layer is made of cross-linked polyethylene material, which has sufficient mechanical strength and weather resistance to resist external environmental erosion.

[0016] Compared with the prior art, the high-strength composite steel pipe with a flame-retardant coating provided by the present application has the following beneficial effects:

[0017] 1、The double-layer design of the intumescent flame-retardant layer and the ceramic fiber thermal insulation layer can form a double-protection system of flame retardation and heat insulation. When a fire occurs, the intumescent flame-retardant layer expands to form a carbon barrier, and the ceramic fiber thermal insulation layer further blocks heat transfer, thereby effectively protecting the metal base pipe layer and greatly reducing the spread speed of the fire.

[0018] 2、The combination bonding system of modified phenolic resin and polyurethane elastomer can ensure that each structural layer remains stable and combined under temperature changes and mechanical stress. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a perspective view of the present application.

[0020] Fig. 2 It is a sectional view of the present application.

[0021] In the drawings:

[0022] 1、composite steel pipe main body;2、metal base pipe layer;3、first bonding layer;4、intumescent flame-retardant layer;5、ceramic fiber thermal insulation layer;6、second bonding layer;7、protective layer. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0024] Refer toFigs. 1-2 A high-strength composite steel pipe with a fire-retardant coating, comprising a composite steel pipe body 1, the composite steel pipe body 1 comprising a high-strength metal base pipe layer 2 arranged from inside to outside, the metal base pipe layer 2 being made of duplex stainless steel material, forming austenite-ferrite duplex phase structure after solid solution treatment, the outer surface of the metal base pipe layer 2 being subjected to shot blasting treatment and silane coupling agent pretreatment to form a micro-nano structure interface layer, the metal base pipe layer 2 being selected from high-quality carbon steel or alloy steel seamless steel pipe, having good mechanical properties and corrosion resistance, ensuring the stability and safety of the pipeline in long-term use.

[0025] A first bonding layer 3, the first bonding layer 3 being a modified phenolic resin adhesive, forming a covalent bond with the metal base pipe layer 2 through a chemical grafting reaction, a second bonding layer 6, the second bonding layer 6 being a polyurethane elastomer adhesive, forming a flexible connection with the ceramic fiber thermal insulation layer 5 through hydrogen bonding; the bonding layer adopts a combined bonding system of modified phenolic resin and polyurethane elastomer, the modified phenolic resin has good adhesion and high temperature resistance, and the polyurethane elastomer gives the bonding layer excellent elasticity and flexibility, ensuring stable bonding between the functional layers when the temperature changes.

[0026] An intumescent fire-retardant layer 4, the intumescent fire-retardant layer 4 being composed of an acid source, a carbon source, a gas source and a nano-enhanced phase, forming a three-dimensional network structure after high-temperature sintering, the intumescent fire-retardant layer 4 containing graphene nanosheets to enhance the compactness and high-temperature resistance of the carbon layer structure, the intumescent fire-retardant layer 4 being selected from high-performance intumescent fire-retardant coating, composed of various components such as flame retardant, carbon forming agent and foaming agent, the coating can rapidly expand to form a dense carbon layer to effectively block the conduction of flame and heat to the inside of the metal base pipe when a fire occurs;

[0027] A ceramic fiber thermal insulation layer 5, the ceramic fiber thermal insulation layer 5 being composed of mullite fibers and silica aerogel, forming a continuous felt-like structure through a needle punching process, the thickness of the ceramic fiber thermal insulation layer 5 being matched with the wall thickness of the metal base pipe layer 2 to form an effective thermal resistance barrier, the ceramic fiber thermal insulation layer 5 being made of ceramic fiber insulation felt or board, being made of high-temperature resistant ceramic fiber, having excellent thermal insulation performance and high-temperature resistance, being able to effectively reduce the surface temperature of the metal base pipe and improve the fire resistance limit of the pipeline;

[0028] A protective layer 7, the protective layer 7 being a cross-linked polyethylene layer, adding nano-zinc oxide and hindered amine light stabilizer to form a weather-resistant system, the protective layer 7 being made of cross-linked polyethylene material, having sufficient mechanical strength and weather resistance to resist external environmental erosion.

[0029] Through the double-layer design of the intumescent flame-retardant layer 4 and the ceramic fiber thermal insulation layer 5, a double-protection system of flame-retardant and thermal insulation can be formed, when encountering fire, the intumescent flame-retardant layer 4 expands to form a carbon barrier under heat, and the ceramic fiber thermal insulation layer 5 further blocks heat transfer, so as to realize effective protection of the metal base pipe layer 2, and then the propagation speed of the fire can be greatly reduced.

[0030] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-strength composite steel pipe having a fire-retardant coating, comprising a composite steel pipe main body (1), characterized by, The composite steel pipe body (1) comprises a high-strength metal base pipe layer (2) arranged from inside to outside, the metal base pipe layer (2) adopts a duplex stainless steel material, and an austenite-ferrite duplex phase structure is formed through solid solution treatment; A first bonding layer (3) is a modified phenolic resin adhesive, and is connected with the metal base pipe layer (2) through a chemical grafting reaction to form a covalent bond; An intumescent flame-retardant layer (4) is composed of an acid source, a carbon source, a gas source and a nano-enhanced phase, and a three-dimensional network structure is formed through high-temperature sintering; A ceramic fiber thermal insulation layer (5) is composed of mullite fibers and silica aerogel, and a continuous felt structure is formed through a needle punching process; A second bonding layer (6) is a polyurethane elastomer adhesive, and is connected with the ceramic fiber thermal insulation layer (5) through a hydrogen bond to form a flexible connection; A protective layer (7) is a cross-linked polyethylene layer, and a weather-resistant system is formed by adding nano-zinc oxide and a hindered amine light stabilizer.

2. A high strength composite steel pipe having a fire retardant coating according to claim 1, characterized in that, The outer surface of the metal base pipe layer (2) is subjected to a shot blasting treatment and a silane coupling agent pretreatment to form a micro-nano structure interface layer.

3. A high strength composite steel pipe having a fire retardant coating according to claim 1, characterized in that, The intumescent flame-retardant layer (4) contains graphene nanosheets to enhance the compactness and high-temperature resistance of the carbon layer structure.

4. The high strength composite pipe with fire retardant coating as claimed in claim 1, wherein, The thickness of the ceramic fiber thermal insulation layer (5) matches the wall thickness of the metal base pipe layer (2) to form an effective thermal resistance barrier.

5. The high strength composite pipe with fire retardant coating as claimed in claim 1, wherein, The protective layer (7) is made of cross-linked polyethylene material, has sufficient mechanical strength and weather resistance, and can resist external environmental erosion.

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