WO2022267074A1 - Device and method for compounding reinforced composite pipe of completely bonded type - Google Patents

Abstract

The present invention belongs to the technical field of composite pipe compounding, and discloses a device and method for compounding a reinforced composite pipe of a completely bonded type. The device comprises a plasma generation device and air heating devices, wherein the air heating devices are arranged on two side edges of the plasma generation device. After the device is mounted, hot air injection nozzles of the air heating devices on the two sides face a pipe needing to be compounded and a reinforced strip to be compounded to the pipe, and a plasma injection nozzle of the plasma generation device faces a position between the pipe needing to be compounded and the reinforced strip, so that a plasma treatment can be carried out after heating. In the present invention, by means of a plasma treatment, the compounding temperature is lowered, the compounding performance and compounding efficiency of the reinforced pipe of the completely bonded type are improved, and time required for machining operations is saved.

Description

A device and method for fully bonded reinforced composite pipe compounding technical field

The invention belongs to the technical field of compound pipe compounding, and in particular relates to a device and method for compounding fully bonded reinforced compound pipes.

Background technique

Fiber-reinforced thermoplastic composite pipes can be divided into two types: non-bonded type and fully bonded type. Because the fully bonded reinforced composite pipe has better overall performance and excellent fatigue resistance, it is widely accepted by the market. The fully bonded reinforced composite pipes currently on the market have poor bonding effects. During use, with the fluctuation of temperature, pressure and other loads, the bonding layer gradually fails. The main reasons are: the existing fully bonded The compounding process is carried out from the three dimensions of compounding temperature, compounding pressure and compounding time. The existing defects are: 1) the surface of the core tube to be composited has an oxide layer, which cannot be processed, and the composite effect is poor; 2) the surface temperature of the composite reinforcement layer is raised to the composite temperature, and the surface oxide layer is still unable to be processed, and the composite effect is poor; 3) The surface to be compounded is heated by hot air, and the compounded surface will be polluted by impurities, moisture, grease, etc. in the air, and the compounding effect is poor; if infrared heating is used, the temperature of the compounded surface at different positions will vary greatly due to the increase in heat, and the compounding effect will vary greatly; 4) Commonly used thermoplastics Most of the plastics are non-polar materials and it is difficult to compound; 5) The compound pressure control is not precise and fluctuates easily, and the compound effect is unstable; 6) The requirement of compound time limits the production speed, resulting in low production efficiency and high production cost.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a device and method for compounding fully bonded reinforced composite pipes.

In order to achieve the above object, the following technical solutions are proposed:

A device for compounding fully bonded reinforced composite pipes, including a plasma generating device and an air heating device, the air heating device is arranged on both sides of the plasma generating device, after the device is installed, the air heating device on both sides The hot air injection nozzles of the plasma generating device are directed towards the pipe to be composited and the reinforcement tape to be composited on the pipe respectively, and the plasma injection nozzle of the plasma generating device is directed between the pipe to be composited and the reinforcement tape to realize plasma treatment after heating the composite surface.

Further, the plasma generating device is a jet-type atmospheric low-temperature plasma processor, and the pipe material is a reinforced thermoplastic pipe.

Further, the air heating device is respectively provided on both sides of the plasma generating device through an angle adjustment device.

Further, one end of the angle adjusting device is fixedly connected to the plasma generating device, the other end is a telescopic device, fixedly connected to the air heating device, and one end of the air heating device is hinged to the plasma generating device.

Further, the outer side of the plasma generating device is a heat insulation layer.

Further, the nozzle width of the hot air injection nozzle is 4mm-8mm larger than the width of the reinforcement belt, and the nozzle width of the plasma injection nozzle is 4mm-8mm larger than the width of the reinforcement belt, so that the hot air and plasma are fully sprayed on the surface to be combined.

A method for compounding fully bonded reinforced composite pipes, comprising the steps of:

1) The pipe is prepared by single-pipe extrusion, multi-pipe co-extrusion or multi-layer compounding;

2) Install the composite device on the winding machine, and set it at the place where the winding reinforcing tape and the pipe to be composited are to be composited, and the air heating device is turned on, and the hot air injection nozzles of the air heating device are respectively directed to the outside of the pipe prepared by step 1). The surface and the composite surface of the reinforcing tape that will be wound on the outer surface of the pipe are heated by hot air to the composite temperature;

3) Turn on the plasma generating device, and the plasma generating device processes the surface to be compounded of the pipe material and the reinforcement tape;

4) While processing, the pipe is pulled by the tractor to move forward in a straight line, and the winding machine equipped with a reinforcing belt is wound and compounded according to the designed angle, and the device rotates with the winding machine.

5) After completing the winding and compounding of the first reinforcement layer, carry out composite processing between the reinforcement layer and the reinforcement layer according to the same operation method from step 2) to step 4);

6) After completing the winding of all reinforcement layers, perform composite processing on the composite surface of the outermost reinforcement layer and the inner surface of the outer layer to be coated according to the same operation method from step 2) to step 4);

7) The composited pipes are put into storage after coiling, cutting, packing and testing.

Further, the particle energy generated by the plasma generating device is greater than the binding energy of the polymers on the surface to be compounded.

Further, the tension of the reinforcing belt is 5N-100N.

Further, the distance between the plasma generating device and the surface to be combined is in the range of 5 mm to 50 mm.

The energy and speed of the plasma can be adjusted by adjusting the setting of the plasma generating device to adapt to the matrix material and compounding speed of the surface to be compounded. .

The application principle of the plasma generating device:

The particle energy in low-temperature plasma is generally about several to tens of electron volts, which is greater than the bonding energy of polymer materials (several to tens of electron volts), and can completely break the chemical bonds of organic macromolecules to form new bonds, but Far lower than the high-energy radioactive rays, it only involves the surface of the material and does not affect the performance of the matrix. In the low-temperature plasma in a state of non-thermodynamic equilibrium, electrons have high energy, which can break the chemical bonds of molecules on the surface of materials and improve the chemical reactivity of particles (greater than thermal plasma), while the temperature of neutral particles is close to room temperature, these Advantages It provides suitable conditions for the surface modification of heat-sensitive polymers. Through low-temperature plasma surface treatment, a variety of physical and chemical changes occur on the surface of the material, or it is etched and rough, or a dense cross-linked layer is formed, or oxygen-containing polar groups are introduced to make it hydrophilic and adhesive. , dyeability, biocompatibility and electrical properties were improved respectively.

The jet-type atmospheric low-temperature plasma processor is composed of a low-temperature plasma generator, a gas delivery system and a low-temperature plasma spray gun. The high-frequency and high-voltage energy generated by the low-temperature plasma generator generates low-temperature plasma in the spray gun, and the plasma is transported out of the cavity to the surface of the workpiece by means of air flow. When the plasma meets the surface of the object to be processed, the above-mentioned chemical action occurs and physical changes, the surface has been modified, cleaned, and hydrocarbon-based contaminants, such as grease and auxiliary additives, have been removed.

In the composite process, using jet low-temperature plasma processor to treat the composite joint surface process can greatly improve the bonding strength, reduce costs, stable bonding quality, good product consistency, no dust, and a clean environment. The best solution for product quality. Because the low-temperature plasma torch ejected by the jet-type atmospheric low-temperature plasma surface treatment machine is neutral particles and has no charge, it is safe to use.

The beneficial effect of the present invention with respect to prior art is:

1) Due to the use of plasma treatment on the composite surface, the requirements for other composite processes are reduced, and the tension control requirements for the reinforcement belt are reduced by a maximum of 20%;

2) Due to the use of plasma to treat the composite surface, the bonding bond of the substrate to be composited is opened, and the complete bonding time of the composite surface is shortened, thereby reducing the pipe composite time by more than 40%, and the pipe production speed can be increased by more than 35%;

3) The bonding strength of the composite interface is increased by 40%, which can reach more than 95% of the body strength, and the trial life of the pipe is increased by more than 60%;

4) The temperature required for the composite pipe is reduced by about 30°C, which reduces the damage of the pipe and strip.

Description of drawings

Fig. 1 is the structural sectional view of device of the present invention;

Fig. 2 is the three-dimensional schematic diagram of device of the present invention

Fig. 3 is a usage diagram of the present invention.

In the figure: 1. Plasma generating device; 2. Plasma injection nozzle; 3. Air heating device; 4. Hot air injection nozzle; 5. Angle adjustment device; 6. Heat insulation layer; 7. Pipe material;

detailed description

The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereto.

As shown in Figure 1 and Figure 2, a device for fully bonded reinforced composite pipe composite, including a plasma generating device 1, an air heating device 3 and an angle adjustment device 5, one end of the angle adjustment device 5 is fixedly connected by screws On the outer surface of the plasma generating device 1, the other end is a telescopic structure, which is fixedly connected with the side of the air heating device 3 by screws, and one end of the air heating device 3 is hinged with the outer surface of the plasma generating device 1, and a plasma generating device 1 An air heating device 3 is respectively hinged on both sides of the plasma generating device 1 , and a heat insulating layer 6 is provided on the outer surface of the plasma generating device 1 .

As shown in Figure 3, when in use, the device is placed between the pipe 7 and the reinforcing belt 8, and the hot air injection nozzles 4 of the air heating devices 3 on both sides are respectively directed towards the pipe 7 to be compounded and the reinforcement to be compounded on the pipe 7. On the belt 8, the plasma spray nozzle 2 of the plasma generating device 1 faces between the pipe material 7 to be composited and the reinforcing belt 8, so as to realize plasma treatment after heating the composite surface, and the air heating device 3 heats the surface to be composited. 7 is pulled and moved forward, and the reinforcing belt 8 is rotated and wound according to a set angle with a certain tension, and then the plasma generating device 1 performs plasma treatment on the outer surface of the heated pipe 7 and the inner surface of the reinforcing belt 8, after the treatment is completed , with the rotation of the reinforcing belt 8, the winding compound is carried out.

A method for compounding fully bonded reinforced composite pipes, comprising the steps of:

1) The pipe 7 is prepared by single-pipe extrusion, multi-pipe co-extrusion or multi-layer compounding;

2) Turn on the air heating device 3, and the hot air injection nozzle 4 of the air heating device 3 is directed towards the outer surface of the pipe 7 prepared in step 1) and the composite surface of the reinforcement tape 8 that will be wound on the outer surface of the pipe 7, respectively. Air heating, heating to composite temperature;

3) Turn on the plasma generating device 1, and the plasma generating device 1 processes the surfaces to be compounded of the pipe material 7 and the reinforcement tape 8;

4) While processing, the pipe material 7 is drawn and moved forward, and the reinforcing belt 8 is rotated and wound according to a set angle with a certain tension force for compounding;

5) After completing the winding and compounding of one layer of reinforcement layer, carry out composite processing between the reinforcement layer and the reinforcement layer according to the same operation method from step 2) to step 4);

6) After completing the winding of all reinforcing layers, carry out composite processing to the composite surface of the outermost reinforcing layer and the inner surface of the outer layer to be coated according to the same operation method from step 2) to step 4);

7) The composite pipe 7 is put into storage after coiling, cutting, packing and testing.

Using polyethylene (PE100) as matrix resin and glass fiber reinforced polyethylene (PE100) tape as reinforcing material, the bonding effect of pipe 7 is shown in Table 1.

Table 1 Composite Effect Comparison of Composite Pipes

index	plasma treatment	Without plasma treatment
Composite temperature (℃)	95	125
Composite time (s)	3	5.5
Compound tension (N)	20±6	20±4.5
Peel strength (N/mm)	40～47	8～13
Bond strength (MPa)	19.5	10.5

It can be seen from Table 1 that the set temperature of the air heating device 3 can be lowered by more than 20°C compared with that without the plasma treatment process, which avoids the phenomenon that the pipe 7 is softened and collapsed due to too high temperature, and the reinforcement belt 8 is deformed and cannot be recombined. , the heating time is also reduced when the temperature is lowered, which effectively reduces the formation of the oxide layer on the composite surface and improves the bonding performance of the composite interface; and the peeling strength required for the peeling of bonded pipes composited by plasma treatment is unseen. 4 times the peel strength of plasma treatment.

Claims (10)

1. A device for compounding fully bonded reinforced composite pipes, characterized in that it comprises a plasma generating device (1) and an air heating device (3), and the air heating device (3) is arranged on the plasma generating device (1) After the installation of the device is completed, the hot air injection nozzles (4) of the air heating devices (3) on both sides face the pipes (7) to be compounded and the reinforcement bands (8) that will be compounded on the pipes (7) respectively. ), the plasma jet nozzle (2) of the plasma generating device (1) faces between the pipe material (7) and the reinforcing belt (8) to be composited, so as to realize plasma treatment after heating the composite surface.
2. A device for compounding fully bonded reinforced composite pipes as claimed in claim 1, wherein said plasma generating device (1) is a jet-type atmospheric low-temperature plasma processor, and said pipes (7 ) is a reinforced thermoplastic pipe.
3. A device for compounding fully bonded reinforced composite pipes as claimed in claim 1, characterized in that the air heating device (3) is respectively arranged on the plasma generating device (1) through an angle adjusting device (5) ) on both sides.
4. A device for compounding fully bonded reinforced composite pipes as claimed in claim 3, characterized in that one end of the angle adjustment device (5) is fixedly connected to the plasma generating device (1), and the other end is telescopic The device is fixedly connected with the air heating device (3), and one end of the air heating device (3) is hinged with the plasma generating device (1).
5. A device for compounding fully bonded reinforced composite pipes according to any one of claims 1-4, characterized in that the outer side of the plasma generating device (1) is a heat insulating layer (6).
6. A device for compounding fully bonded reinforced composite pipes as claimed in claim 1, characterized in that the nozzle width of the hot air injection nozzle (4) is 4mm-8mm larger than the width of the reinforcement strip (8), The nozzle width of the plasma jet nozzle (2) is 4mm-8mm larger than the width of the reinforcement band (8).
7. A method for compounding fully bonded reinforced composite pipes as claimed in claim 1, characterized in that it comprises the steps of:

   1) The pipe (7) is prepared by single-pipe extrusion, multi-pipe co-extrusion or multi-layer compounding;

   2) Install the composite device on the winding machine, and set it at the place to be composited between the winding reinforcement tape (8) and the composite pipe (7), open the air heating device (3), and the hot air injection nozzle of the air heating device (3) (4) Towards the outer surface of the pipe (7) prepared in step 1 and the composite surface of the reinforcement tape (8) wound on the outer surface of the pipe (7), respectively, heat with hot air to the composite temperature;

   3) Turn on the plasma generating device (1), and the plasma generating device (1) processes the surface to be compounded of the pipe (7) and the reinforcing tape (8);

   4) While processing, the pipe (7) is pulled by the tractor to move forward in a straight line, and the winding machine equipped with the reinforcing belt (8) is wound and compounded according to the designed angle, and the device rotates with the winding machine;

   5) After completing the winding and compounding of the first layer of reinforcement layer, carry out composite processing between the reinforcement layer and the reinforcement layer according to the same operation method as in step 2) to step 4);

   6) After completing the winding of all reinforcement layers, perform composite processing on the composite surface of the outermost reinforcement layer and the inner surface of the outer layer to be coated according to the same operation method from step 2) to step 4);

   7) The composite pipe (7) is put into storage after coiling, cutting, packaging and testing.
8. A method for compounding fully bonded reinforced composite pipes as claimed in claim 7, characterized in that the energy of the particles generated by the plasma generating device (1) is greater than the bonding energy of the polymers on the surface to be compounded.
9. A method for compounding fully bonded reinforced composite pipes as claimed in claim 7, characterized in that the tension of the reinforcing tape (8) is 5N-100N.
10. A method for compounding fully bonded reinforced composite pipes according to claim 7, characterized in that the distance between the plasma generating device (1) and the surface to be compounded is in the range of 5 mm to 50 mm.

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