CN204879094U - Thermoplasticity pipeline of relevant continuous fibers reinforcing - Google Patents

Abstract

The utility model relates to the technical field of glass fiber and pipe molding, and specifically relates to a continuous fiber-reinforced thermoplastic pipe. The pipe is composed of an inner layer and a braided reinforced structural layer on the inner layer, and a braided reinforced structural layer on the inner layer and the reinforced structural layer. The outer thermoplastic protective layer is composed of a three-layer structure formed at one time. The inner layer is made of thermoplastic film or sheet. The reinforcement layer is made of pre-impregnated thermoplastic fiber yarns that are woven, wound and arranged longitudinally. The outer layer is made of thermoplastic materials in the inner layer and reinforcement layer. It is extruded with an extruder and the three-layer structure is integrated into one. The pipe specification is D1000mm or less, and the operating pressure is 1-15MPa. This utility model retains the traditional three-layer structure of RTP pipes and changes the traditional step-by-step molding method to one-time molding, shortening the length of the production line by half, greatly reducing equipment investment, making the product quality more stable, and having very high compressive strength and impact resistance. , can be produced continuously.

Description

About Continuous Fiber Reinforced Thermoplastic Pipes

[technical field]

The utility model relates to the technical field of glass fiber and pipe forming, in particular to a continuous fiber reinforced thermoplastic pipe.

[Background technique]

In the past ten years, continuous fiber reinforced thermoplastic pipes (Reinforced Thermoplastic Pipes) have been a popular research direction in the international pipeline field, because it has very obvious advantages, which can not only exert the high strength of fibers, withstand high pressure, but also maintain the good flexibility of thermoplastics And corrosion resistance, it has a broad market in the application of high-pressure pipes such as oil pipelines, gas pipes, water supply and drainage pipes.

The traditional RTP pipe has a three-layer structure, that is, the inner and outer layers are extruded thermoplastic layers, and the middle layer is a fiber-reinforced layer or a steel wire-reinforced layer. The method adopted is to extrude a thermoplastic inner layer tube first, then wind a reinforcement layer on the inner layer, and finally extrude an outer surface protection layer. As described in the patent document CN103878990A, the products produced by this method have high compressive capacity and good safety, but the production line of this process is very long, generally about 80M long, and even more than 100M for multi-layer reinforced thick tubes. The technology of heating and melting between layers is relatively high, the control is not good, and quality problems are prone to occur. At present, the mature European production line needs about 20-30 million RMB. The domestic production line is still in the research and development stage, and it is expected to need 10 million RMB. Above, this kind of high cost investment and low efficiency production hinder the application of RTP pipe. Although the method described in the patent document CN102363363A is simple, the current online fiber dipping technology is far from meeting the requirements, the fiber is difficult to soak, and the product produced has too many microbubbles, so it cannot be used as a high-pressure resistant product. This approach simply does not work if the fibers are reinforced in a braided form.

[Content of the invention]

The purpose of this utility model is to overcome the defects of the traditional production of glass fiber reinforced thermoplastic pipes. According to the technical principle of thermosetting pultrusion and combined with thermoplastic extrusion methods, thermoplastic films or sheets are used to form the inner layer. Pre-impregnated thermoplastic fiber yarn is braided, wound and longitudinally arranged to form a reinforced layer, and an outer layer is arranged on the inner layer and the reinforced layer. The outer layer is extruded by an extruder, and the three-layer structure is integrated into a continuous molding process. Fiber reinforced thermoplastic pipes. This product has good toughness, high compression resistance, stable quality, corrosion resistance, and long service life. It has broad application prospects in the fields of water supply and drainage, gas pipes, oil pipelines, etc., and this method requires less investment in production equipment and occupies a small space. , which has important practical value.

In order to achieve the above purpose, a continuous fiber reinforced thermoplastic pipe is designed, which consists of a thermoplastic inner layer and a braided reinforced structural layer on the inner layer, and an outer thermoplastic protective layer on the inner layer and the reinforced structural layer. The three-layer structure is formed by pultrusion and extrusion mixing at one time, the inner layer is made of thermoplastic film or sheet; the reinforcing layer is made of pre-impregnated thermoplastic fiber yarn weaving, winding and longitudinal arrangement; The outer layer is extruded by an extruder on the inner tube and the reinforcing layer of thermoplastic material, and the three-layer structure is integrated; the specification of the pipeline is below D1000mm, and the working pressure is 1-15MPa.

The inner layer is made of a thermoplastic film or sheet in a winding or longitudinal manner, and forms an integral inner layer at a melting temperature with a thickness of about 0.2-2mm.

The reinforcing layer is made by braiding, winding and longitudinally disposing the fiber pre-impregnated with thermoplastic material on the inner layer according to the design requirements, and its thickness is determined by the strength requirement.

The outer layer is made of thermoplastic material, when the inner layer and the reinforcing layer are melted, the extruder is used to pressurize and extrude the supplementary material, so that the three-layer structure is integrated, and a thermoplastic layer with a thickness of 0.5-2mm is formed on the surface. The protective layer.

The fiber is adopted as glass fiber or basalt fiber or carbon fiber or aramid fiber.

The thermoplastic material is PVC or PE or HDPE or PP or PA or other modified thermoplastic matrix.

Compared with the prior art, the utility model has a reasonable product structure design, retains the existing three-layer structure of the RTP pipe, but is a complete whole formed at one time, and creatively adopts the pultrusion/extrusion mixing method to produce a The brand new product has made a leap in product quality. The product quality is more stable, with very high compressive strength and impact resistance. The thickness of the inner and outer layers of the product can reach about 0.5mm, which is impossible for traditional RTP pipes. , which greatly reduces the product cost and can be produced continuously.

[Description of drawings]

Fig. 1 is the sectional structure schematic diagram of the present utility model;

Fig. 2 is the structural representation of production line of the present utility model;

In Fig. 1: 21. Outer pipe 22. Reinforcing layer 23. Inner pipe;

In Figure 2: 1. Inner thermoplastic layer 2. Inner braiding machine 3. Winding machine 4. Outer braiding machine 5. Mandrel 6. Outer mold 7. Heating ring 8. Screw extruder 9. Extrusion die head 10. Inner Heating rod 11. Shaping sleeve 12. Vacuum calibrating box 13. Cooling box 14. Tractor 15. Cutting machine;

Designate Fig. 1 as the abstract accompanying drawing of the utility model.

[Detailed ways]

Below in conjunction with accompanying drawing, the utility model is further described, and the structure and principle of this device are very clear to those skilled in the art. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figure 1, the pipeline in the utility model is composed of an inner layer and a reinforced layer structure braided on the inner layer, and an outer layer is arranged on the reinforced layer structure. The three-layer structure is formed at one time, and the inner layer is made of thermoplastic film or sheet Composition, the reinforcing layer is made of pre-impregnated thermoplastic fiber yarn weaving, winding and longitudinal arrangement; when the thermoplastic material of the outer layer and the inner layer and the reinforcing layer are melted, the extruder is used to pressurize and extrude the supplementary material, so that the three-layer structure is fused. One piece, and form a thermoplastic protective layer on the surface. The pipe specification is below D1000mm, the working pressure is 1-15MPa, and the fibers are glass fiber, basalt fiber, carbon fiber, aramid fiber, etc. The thermoplastic material is PVC, PE, HDPE, PP, PA or modified thermoplastic matrix.

The production line designed by the utility model is shown in Figure 1. First, the inner thermoplastic layer is coated on the front-end mandrel, and then the multi-layer fiber structure is composed of inner weaving, winding and outer weaving of fibers. The middle section is the heated outer mold and mandrel. And extruder, die head, internal heating constitute the core. The latter part is the vacuum calibrating box, cooling box, tractor, cutting machine, etc. commonly used in thermoplastics production.

The specific production method is as follows: First, the thermoplastic film or sheet is evenly coated on the mandrel 5, and then the fibers with thermoplastic prepreg are woven through the inner braiding machine 2, and then the winding machine 3 is used to wrap the circumferential layer, and then through The outer braiding machine 4 weaves to form a multi-layer reinforced structure. Under the action of the tractor 14, it is sent into the cavity of the heated inner mold 5 and outer mold 6 for heating. The heating temperature is determined according to different materials, so that the thermoplastic material on the fiber surface reaches The molten state, and the thermoplastic material extruded by the screw extruder 8 are fused together at the die head 9 sections to form a whole. The heating of the die head is completed by the outer heating ring 7 and the inner heating rod 10. The pipe that comes out is shaped by the calibrating sleeve 11 and the vacuum calibrating box 12, and then completely cooled by the cooling box 13, and finally enters the cutting machine 15 through the tractor 14, and is processed according to the requirements. Cut to length to become a finished product.

Claims (6)

1. A thermoplastic pipe reinforced with continuous fibers, characterized in that: the pipe is composed of a thermoplastic inner layer and a braided reinforced structural layer on the inner layer, and an outer thermoplastic protective layer is arranged on the inner layer and the reinforced structural layer, The three-layer structure is formed by pultrusion and extrusion mixing at one time, the inner layer is made of thermoplastic film or sheet; the reinforcing layer is made of pre-impregnated thermoplastic fiber yarn weaving, winding and longitudinal arrangement; The outer layer is extruded from thermoplastic material on the inner layer and the reinforcing layer by an extruder, and the three-layer structure is integrated; the specification of the pipe is below D1000mm, and the working pressure is 1-15MPa. 2. A continuous fiber-reinforced thermoplastic pipe as claimed in claim 1, characterized in that the inner layer is made of thermoplastic film or sheet in a winding or longitudinal manner, forming an integral inner layer at the melting temperature, The thickness is about 0.2-2mm. 3. A continuous fiber-reinforced thermoplastic pipe as claimed in claim 1, characterized in that the reinforcement layer is braided, wound and longitudinally arranged on the inner layer of fibers pre-impregnated with thermoplastic materials according to design requirements , whose thickness is determined by the strength requirements. 4. A continuous fiber-reinforced thermoplastic pipe as claimed in claim 1, characterized in that the outer layer is made of thermoplastic material when the inner layer and the reinforcing layer are melted, and then pressurized and extruded by an extruder to make up The three-layer structure is integrated, and a thermoplastic protective layer with a thickness of 0.5-2mm is formed on its surface. 5. A continuous fiber-reinforced thermoplastic pipe as claimed in claim 1, characterized in that said fiber is glass fiber or basalt fiber or carbon fiber or aramid fiber. 6. A continuous fiber reinforced thermoplastic pipe as claimed in claim 1, characterized in that said thermoplastic material is PVC or PE or HDPE or PP or PA or other modified thermoplastic matrix.