CN114413078A - Continuous fiber prepreg rib plate winding reinforced composite pipe and production method - Google Patents

Abstract

The invention provides a winding reinforced composite pipe with continuous fiber pre-impregnated rib plates and a production method thereof, wherein the winding reinforced composite pipe comprises a composite pipe intermediate layer, a composite pipe inner layer compounded on the inner wall of the composite pipe intermediate layer and a composite pipe outer layer compounded on the outer wall of the composite pipe intermediate layer; the composite pipe middle layer comprises a hollow polyolefin pipe spirally wound on the outer wall of the composite pipe inner layer. The invention has the advantages that: the reinforced composite pipe reinforced by the three layers can well overcome the defects of plastic material performance, can save 30 to 70 percent of raw materials compared with a solid-wall pipe, and is a novel pipeline which integrates rigidity and flexibility into a whole, is environment-friendly and energy-saving in a real sense.

Description

A kind of continuous fiber prepreg rib winding reinforced composite pipe and production method

【Technical field】

The invention relates to the technical field of composite pipes, in particular to a continuous fiber pre-impregnated rib winding reinforced composite pipe and a production method thereof, which are suitable for oil and gas transportation, medium and high pressure water transportation, thermal insulation pipelines, agricultural drainage and irrigation, urban rainwater and sewage discharge, and low-pressure transportation. Water, buried fire pipe network, mining wear-resistant pipes, trenchless pipes, rainwater and sewage manhole inspection wells and other fields.

【Background technique】

Polyethylene is a thermoplastic with good cold resistance, chemical stability, water resistance and excellent dielectric properties. It has good molding technology and low price, and is widely used in the pipeline industry. However, due to its low strength, poor rigidity, large linear expansion coefficient, large molding shrinkage, and easy environmental stress cracking, its application in large-diameter, high internal pressure, and high external pressure environments is limited.

At present, there are polyethylene as the matrix material and glass fiber as the reinforcing material on the market, that is, the polyethylene composite material is obtained by adding glass fiber to the polyethylene material to achieve the purpose of material reinforcement. When the glass fiber content is 30%, the impact strength of the polyethylene composite material is the strongest, the maximum value is 16.0KJ/㎡, which is 1.19 times that of pure HDPE polyethylene; when the glass fiber content is 35%, the polyethylene composite The tensile strength of the material reaches the maximum, the maximum value is 31.6Mpa, which is 1.36 times that of pure HDPE polyethylene; when the glass fiber content is 40%, the hardness of the polyethylene composite material is the highest, the maximum value is 81, which is pure HDPE polyethylene. 1.35 times that of ethylene; when the addition of glass fiber is 40%, the elongation at break of the polyethylene composite is at least 15%, which is 98.2% lower than that of pure HDPE polyethylene. Experiments show that simple material reinforcement cannot significantly improve the performance of the pipe. In view of the above-mentioned problems, the inventor of this case conducted in-depth research on the problem, and this case came into being.

[Content of the invention]

The technical problem to be solved by the present invention is to provide a continuous fiber prepreg rib winding reinforced composite pipe and a production method, which solves the problem that the existing simple material reinforcement cannot significantly improve the performance of the pipe, resulting in easy damage to the pipe during use.

The present invention is realized in this way:

In a first aspect, a continuous fiber prepreg rib winding reinforced composite pipe includes a composite pipe intermediate layer, a composite pipe inner layer compounded on the inner wall of the composite pipe intermediate layer, and a composite pipe inner layer compounded on the outer wall of the composite pipe intermediate layer. The outer layer of the composite pipe; the middle layer of the composite pipe comprises a hollow polyolefin pipe spirally wound on the outer wall of the inner layer of the composite pipe; the outer wall of the hollow polyolefin pipe is sequentially compounded with a first plastic layer and a second A continuous fiber layer.

Further, the inner layer of the composite pipe includes a second plastic layer and a second continuous fiber layer compounded on the outer wall of the second plastic layer, and the hollow polyolefin pipe is spirally wound on the outer wall of the second continuous fiber layer. .

Further, the outer layer of the composite pipe material includes a third continuous fiber layer compounded on the outer wall of the intermediate layer of the composite pipe material and a third plastic layer compounded on the outer wall of the third continuous fiber layer.

Further, the hollow polyolefin pipe is a square pipe, a round pipe, a triangular pipe or a trapezoidal pipe.

Further, the second plastic layer has a smooth inner wall.

In a second aspect, a method for producing a continuous fiber prepreg rib wrapping reinforced composite pipe, the production method comprising:

Step S1, forming the second plastic layer by extrusion molding, and compounding the second continuous fiber layer on the outer surface of the second plastic layer by hot-melting, thereby obtaining the inner layer of the composite pipe;

Step S2, spirally winding the prefabricated hollow polyolefin pipe on the outer surface of the second continuous fiber layer, thereby obtaining the intermediate layer of the composite pipe;

Step S3, compound a third continuous fiber layer on the outer surface of the wound hollow polyolefin tube by hot-melting, and form a third plastic layer on the outer surface of the third continuous fiber layer by extrusion molding, thereby The outer layer of the composite pipe is obtained;

Step S4, after the reinforced composite pipe is formed, the reinforced composite pipe is cooled down.

Further, before the prefabricated hollow polyolefin tube is helically wound on the outer surface of the second continuous fiber layer, a prefabricated hollow polyolefin tube is also included, specifically including: by extrusion molding on the outer surface of the hollow polyolefin tube A first plastic layer is formed, and a first continuous fiber layer is laminated on the outer surface of the first plastic layer by means of heat fusion.

By adopting the technical solution of the present invention, at least the following beneficial effects are obtained: the middle layer of the composite pipe is reinforced by the first continuous fiber layer, the inner layer of the composite pipe is reinforced by the second continuous fiber layer, and the inner layer of the composite pipe is strengthened by the second continuous fiber layer, and the The outer layer of the composite pipe is reinforced; the reinforced composite pipe reinforced by three layers can well solve the deficiencies in the performance of plastic materials, and the reinforced composite pipe can save 30%-70% of raw materials compared with the solid wall pipe (the larger the diameter, the It is a new type of pipeline that integrates rigidity and flexibility, environmental protection and energy saving, and can completely replace traditional cement pipes, PCCP pipes, glass steel pipes, plastic corrugated pipes, HDPE winding reinforced pipes, and steel belt spiral corrugated pipes. , PE pipe, ductile iron pipe, spiral steel pipe, etc.

【Description of drawings】

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Fig. 1 is the sectional view of the reinforced composite pipe of the present invention along the length direction;

Fig. 2 is a cross-sectional view of a hollow polyolefin pipe compounded with a first plastic layer, a first continuous fiber layer and a second plastic layer according to the present invention.

Description of reference numbers:

Description of reference numbers:

100-reinforced composite pipe;

1- composite pipe intermediate layer, 11- hollow polyolefin pipe, 12- first plastic layer, 13- first continuous fiber layer;

2- composite pipe inner layer, 21- second plastic layer, 211- smooth inner wall, 22- second continuous fiber layer;

3- composite pipe outer layer, 31- third continuous fiber layer, 32- third plastic layer of outer wall.

【Detailed ways】

In order to better understand the technical solutions of the present invention, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

It should be noted here that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", "vertical", " The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing these embodiments and simplifying the description, and It is not indicated or implied that the indicated device or element must have a particular orientation, be constructed and operate in a particular orientation. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature.

Example 1

1 and 2, a preferred embodiment of the present invention is a continuous fiber prepreg rib wrapping reinforced composite pipe 100. The reinforced composite pipe 100 includes a composite pipe intermediate layer 1, which is compounded on the composite pipe intermediate layer. The composite pipe inner layer 2 of the inner wall of 1 and the composite pipe outer layer 3 composited on the outer wall of the composite pipe intermediate layer 1; the composite pipe intermediate layer 1 includes a hollow spiral wound on the outer wall of the composite pipe inner layer 2 Polyolefin pipe 11; the outer wall of the hollow polyolefin pipe 11 is sequentially compounded with a first plastic layer 12 and a first continuous fiber layer 13 from the inside to the outside.

In the present invention, the composite pipe intermediate layer 1 of the reinforced composite pipe 100 is designed to include a hollow polyolefin pipe 11 spirally wound on the outer wall of the inner layer 2 of the composite pipe, and the outer wall of the hollow polyolefin pipe 11 is sequentially compounded from inside to outside. The first plastic layer 12 and the first continuous fiber layer 13, because the continuous fibers have the advantages of high pressure resistance, high temperature resistance, corrosion resistance, good insulation performance, high mechanical strength, low longitudinal shrinkage rate, low creep ratio, etc. The intermediate layer 1 of the composite pipe plays a very good reinforcing role.

In the embodiment of the present invention, the inner layer 2 of the composite pipe includes a second plastic layer 21 and a second continuous fiber layer 22 compounded on the outer wall of the second plastic layer 21 , and the hollow polyolefin pipe 11 is spirally wound on the outer wall of the second continuous fiber layer 22 .

In the present invention, the inner layer 2 of the composite pipe is designed to include the second plastic layer 21 and the second continuous fiber layer 22 compounded on the outer wall of the second plastic layer 21. Because the continuous fibers have high pressure resistance, high temperature resistance, corrosion resistance, good insulation performance, It has the advantages of high mechanical strength, low longitudinal retraction rate, low creep rate, etc., so it can play a good role in strengthening the inner layer 2 of the composite pipe.

In the embodiment of the present invention, the outer layer 3 of the composite pipe material includes a third continuous fiber layer 31 compounded on the outer wall of the intermediate layer 1 of the composite pipe material and a third continuous fiber layer 31 compounded on the outer wall of the third continuous fiber layer 31 Plastic layer 32 .

In the present invention, the outer layer 3 of the composite pipe is designed to include the third continuous fiber layer 31 and the third plastic layer 32 compounded on the outer wall of the third continuous fiber layer 31. Because the continuous fiber has high pressure resistance, high temperature resistance, corrosion resistance and good insulation performance , high mechanical strength, low longitudinal retraction rate, low creep rate and other advantages, so it can play a good role in strengthening the outer layer 3 of the composite pipe. At the same time, since the continuous fibers between the first continuous fiber layer 13 and the second continuous fiber layer 22 and between the first continuous fiber layer 13 and the third continuous fiber layer 31 are staggered in an "I" shape, the reinforced composite The overall performance of the tube 100 is well improved.

In the embodiment of the present invention, the fibers of the first continuous fiber layer 13, the second continuous fiber layer 22 and the third continuous fiber layer 31 can be carbon fibers, glass fibers, steel fibers, aramid fibers, polyester fibers, etc.; The first plastic layer 12, the second plastic layer 21 and the third plastic layer 32 may be polypropylene, polyethylene, polybutylene, polyvinyl chloride and other materials.

The reinforced composite pipe 100 of the present invention is constructed by reinforcing the intermediate layer 1 of the composite pipe with the first continuous fiber layer 13, the inner layer 2 of the composite pipe with the second continuous fiber layer 22, and the composite pipe with the third continuous fiber layer 31. The outer layer 3 is reinforced. The reinforced composite pipe 100 reinforced by three layers has a tensile strength of 250Mpa, which is more than ten times that of pure HDPE polyethylene, which is close to the steel pipe, but the relative density is about 1.6, which is about 1/5 of the steel pipe, so the strength is high. ; The thermal conductivity of the reinforced composite pipe 100 is 0.36W/(m·K), which is only 1% of that of the steel pipe, and the thermal insulation performance is good; Roughness, medium flow friction resistance is small; reinforced composite pipe 100 has good corrosion resistance to various strong acids, strong alkalis, inorganic salt solutions, oxidizing media, hydrogen sulfide, surfactants, polymer solutions, organic solvents, etc. ; The number of bending fatigue cycles of the reinforced composite pipe 100 can reach more than 10,000 times, and the fatigue resistance is good; the working pressure of the reinforced composite pipe 100 is 0.6-25Mpa, and the ring stiffness of the large-diameter reinforced composite pipe 100 can also reach more than 20KJ/㎡ , can well fill the gap of insufficient rigidity of pure plastic pipes above 3000mm.

In the embodiment of the present invention, the hollow polyolefin pipe 11 is a square pipe, a circular pipe, a triangular pipe or a trapezoidal pipe, that is, in the specific implementation, the hollow polyolefin pipe 11 can be a square pipe, a circular pipe, a triangular pipe Either pipe or trapezoidal pipe.

In the embodiment of the present invention, the second plastic layer 21 has a smooth inner wall 211 to reduce the friction between the fluid transported in the reinforced composite pipe 100 and the inner wall of the reinforced composite pipe 100 to ensure smoother delivery of the fluid.

In specific applications, the reinforced composite pipe 100 of the present invention is suitable for oil and gas transportation, medium and high pressure water transportation, thermal insulation pipelines, agricultural irrigation and drainage, urban rain and sewage discharge, low pressure water transportation, buried fire-fighting pipe network, mine wear-resistant pipeline, trenchless pipelines and other fields.

To sum up, after the reinforced composite pipe 100 of the present invention is reinforced by three layers of the first continuous fiber layer 13 , the second continuous fiber layer 22 and the third continuous fiber layer 31 , it can well solve the performance problems of plastic materials. In addition, the reinforced composite pipe 100 can save 30%-70% of raw materials compared with the solid wall pipe (the larger the diameter, the more the material is saved). Traditional cement pipes, PCCP pipes, glass steel pipes, plastic corrugated pipes, HDPE winding reinforced pipes, spiral corrugated pipes with steel strips, PE pipes, ductile iron pipes, spiral steel pipes, etc. are used.

Example 2

Please refer to FIG. 1 and FIG. 2 , a production method of a continuous fiber prepreg rib wrapping reinforced composite pipe 100 of the present invention, the production method includes:

Step S1, forming the second plastic layer 21 by extrusion molding, and compounding the second continuous fiber layer 22 on the outer surface of the second plastic layer 21 by hot-melting, thereby obtaining the inner layer 2 of the composite pipe; The second continuous fiber layer 22 can strengthen the inner layer 2 of the entire composite pipe, the second continuous fiber layer 22 can be carbon fiber, glass fiber, steel fiber, aramid fiber, polyester fiber, etc.; the second plastic layer 21 can be poly Propylene, polyethylene, polybutene, polyvinyl chloride and other materials.

Step S2, the prefabricated hollow polyolefin tube 11 is spirally wound on the outer surface of the second continuous fiber layer 22, thereby obtaining the composite pipe intermediate layer 1; by spirally winding the prefabricated hollow polyolefin tube 11 on the second continuous fiber layer The composite pipe intermediate layer 1 is obtained on the layer 22, which can achieve the purpose of saving raw materials.

Step S3, compound the third continuous fiber layer 31 on the outer surface of the wound hollow polyolefin tube 11 by hot-melting, and form a third plastic on the outer surface of the third continuous fiber layer 31 by extrusion molding layer 32 to obtain the outer layer 3 of the composite pipe; the third continuous fiber layer 31 can enhance the outer layer 3 of the composite pipe, and the third continuous fiber layer 31 can be carbon fiber, glass fiber, steel fiber, aramid fiber, Polyester fiber, etc.; the third plastic layer 32 can be polypropylene, polyethylene, polybutylene, polyvinyl chloride and other materials.

Step S4 , after the reinforced composite pipe 100 is formed, the reinforced composite pipe 100 is cooled down.

In the embodiment of the present invention, before the prefabricated hollow polyolefin tube 11 is spirally wound on the outer surface of the second continuous fiber layer 22, the prefabricated hollow polyolefin tube 11 is also included, specifically including: by extrusion molding A first plastic layer 12 is formed on the outer surface of the hollow polyolefin tube 11 , and a first continuous fiber layer 13 is laminated on the outer surface of the first plastic layer 12 by heat fusion. Wherein, the first continuous fiber layer 13 can strengthen the intermediate layer 1 of the composite pipe, and the first continuous fiber layer 13 can be carbon fiber, glass fiber, steel fiber, aramid fiber, polyester fiber, etc.; the first plastic layer 12 It can be polypropylene, polyethylene, polybutene, polyvinyl chloride and other materials.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we describe are only illustrative, rather than used to limit the scope of the present invention. Equivalent modifications and changes made by a skilled person in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims (7)

1. A continuous fiber prepreg rib winding reinforced composite pipe is characterized in that: comprising a composite pipe material intermediate layer, a composite pipe material inner layer compounded on the inner wall of the composite pipe material intermediate layer, and a composite pipe material inner layer compounded in the composite pipe material intermediate layer. The outer layer of the composite pipe material of the outer wall; the middle layer of the composite pipe material comprises a hollow polyolefin pipe spirally wound on the outer wall of the inner layer of the composite pipe material; the outer wall of the hollow polyolefin pipe is sequentially compounded with a first plastic layer from the inside to the outside and a first continuous fiber layer. 2 . The reinforced composite pipe according to claim 1 , wherein the inner layer of the composite pipe comprises a second plastic layer and a second continuous fiber layer compounded on the outer wall of the second plastic layer, and the hollow poly An olefin tube is helically wound around the outer wall of the second continuous fiber layer. 3 . The reinforced composite pipe according to claim 1 , wherein the outer layer of the composite pipe comprises a third continuous fiber layer compounded on the outer wall of the intermediate layer of the composite pipe and a third continuous fiber layer compounded on the third continuous fiber layer. 4 . The third plastic layer of the outer wall. 4. The reinforced composite pipe according to claim 1, wherein the hollow polyolefin pipe is a square pipe, a circular pipe, a triangular pipe or a trapezoidal pipe. 5. The reinforced composite pipe of claim 2, wherein the second plastic layer has a smooth inner wall. 6. A production method for continuous fiber prepreg rib winding reinforced composite pipe, characterized in that: the production method comprises: Step S1, forming the second plastic layer by extrusion molding, and compounding the second continuous fiber layer on the outer surface of the second plastic layer by hot-melting, thereby obtaining the inner layer of the composite pipe; Step S2, spirally winding the prefabricated hollow polyolefin pipe on the outer surface of the second continuous fiber layer, thereby obtaining the intermediate layer of the composite pipe; Step S3, compound a third continuous fiber layer on the outer surface of the wound hollow polyolefin tube by hot-melting, and form a third plastic layer on the outer surface of the third continuous fiber layer by extrusion molding, thereby The outer layer of the composite pipe is obtained; Step S4, after the reinforced composite pipe is formed, the reinforced composite pipe is cooled down. 7. The production method according to claim 6, characterized in that: before the prefabricated hollow polyolefin tube is spirally wound on the outer surface of the second continuous fiber layer, the prefabricated hollow polyolefin tube is also included, specifically comprising: The first plastic layer is formed on the outer surface of the hollow polyolefin tube by extrusion molding, and the first continuous fiber layer is laminated on the outer surface of the first plastic layer by hot melting.

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