Continuous fiber reinforced thermoplastic composite tube and forming method thereof

Abstract

The invention discloses a continuous fiber reinforced thermoplastic composite tube and a forming method thereof. The continuous fiber reinforced thermoplastic composite tube comprises an SFT extruding layer and an CFRT winding reinforcing layer, which are alternatively wound, and are extruded and wound on a winding mould. With the adoption of the scheme, the manufactured tube structurally changes a three-layer structure of a lining layer, a reinforcing layer and a protective layer of a conventional reinforcing tube, and a production mode is changed into a one-step process from a conventional three-section process, so that the biggest advantages are that the efficiency is improved and energy consumption is reduced; and extruding and winding are performed through one step, so that the tube has designability and meets requirements of different application fields. The tube is wide in applicability, can be used for manufacturing small-caliber tubes and also can be used for manufacturing large-caliber tubes; compared with energy consumption of a conventional winding tube, energy consumption of the large-caliber tubes is reduced by 30%-50%; and manufactured products and generated leftover materials can be recycled and utilized again, so that the forming method belongs to the green product technology.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a continuous fiber reinforced thermoplastic composite pipe and a forming method thereof. Background technique [0002] The importance of oil and gas extraction to the country is well known. In the past, most of the oil and gas extraction industry used various steel pipes, and the most prominent problem was corrosion. With the development of industry and the advancement of technology, it is urgent to break through the limitations of traditional pipelines and seek new pipelines with better technical and economic performance. In recent years, the oil and gas industry has increasingly adopted non-metallic pipelines. In China, due to the abundance of oil and gas resources in deserts, swamps, oceans and beaches (from shallow sea to deep sea), it is corrosion-resistant, high-pressure resistant, flexible and flexible, and can be made into reinforced thermoplasti...

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Problems solved by technology

[0004] Chinese patent 201220074379.7 A glass fiber reinforced thermoplastic pipe discloses a glass fiber reinforced thermoplastic pipe, which is divided into an inner layer, a reinforcement layer and a protective layer. The material of the protective layer is glass fiber roving or glass fiber rope or glass fiber Fiber surface-treated ropes are plastic-coated to become reinforcing tapes and wound into tubes. Due to the high viscosity of thermoplastic resins, it is difficult for rovings, glass fiber ropes, and glass fiber-treated ropes to fully infiltrate with them, resulting in dry yarns More, it is difficult to achieve the theoretical strength of the design. To achieve the theoretical strength, it is necessary to add layers, which will inevitably lead to an increase in the rigidity of the RTP pipe, which is not conducive to its coiling and transportation. The most important thing is that it will increase its cost, which is not conducive to its to promote

[0005] Chinese patent 201220580156.8 is a basalt fiber-reinforced thermoplastic pipe, including an inner liner, a fiber-reinforced layer wound outside the inner-lined pipe, and an outer protective sleeve wrapped around the fiber-reinforced layer. Although basalt fiber-reinforced thermoplastic composites have been developed, Most of them are products in the experimental stage, and basalt fiber is difficult to disperse, has poor bonding force with thermoplastic resin, and the corresponding compatibilizer and grafting agent are not well developed. The price and performance are basically compared with glass fiber reinforced thermoplastic composite materials. The application can only make related conceptual products, and cannot achieve mass production or even civilian use

At present, the domestic use of this kind of pipe is the traditional method. First, extrude the thermoplastic inner pipe, then wind the reinforcing layer on the inner pipe, and finally extrude the outer surface protective layer. The forming method of this method belongs to the three-step forming method. Many processes require high processing precision

And at present, the mature European production line needs about 20-30 million RMB, and the domestic production line is still in the research and development stage, and it is expected to need more than 10 million RMB. This kind of high cost investment and low efficiency production hinder the application of RTP pipe

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