阅读说明：本技术 一种轻质耐高压复合材料管材、制备方法及制备系统 (Light high-pressure-resistant composite pipe, preparation method and preparation system ) 是由 韩旭 陶友瑞 于 2021-08-30 设计创作，主要内容包括：本申请提供一种轻质耐高压复合材料管材、制备方法及制备系统,所述轻质耐高压复合材料管材包括塑料内层管、缠绕在所述塑料内层管上的连续纤维布、以及浸渍并加热固化在连续纤维布上的MC尼龙。本发明先在管道芯棒上缠绕连续纤维布并对其进行预热,再用MC尼龙预聚体对预热后的连续纤维布进行浸渍,最后对浸渍的MC尼龙预聚体进行加热固化,制备得到复合材料管材成品,与现有技术相比,本发明的工艺更加简单、生产周期短、生产效率高,所制备的复合材料管材的整体机械性能较高,具有高强度、耐腐蚀、高抗压、质量轻的特点,其适用范围更广,特别适用于在恶劣工况下使用：如高温、腐蚀、高强度、受冲击等严苛工况。(The application provides a light high-pressure-resistant composite material pipe, a preparation method and a preparation system, wherein the light high-pressure-resistant composite material pipe comprises a plastic inner layer pipe, continuous fiber cloth wound on the plastic inner layer pipe, and MC nylon impregnated and heated and cured on the continuous fiber cloth. The invention firstly winds the continuous fiber cloth on the pipeline core rod and preheats the continuous fiber cloth, then uses the MC nylon prepolymer to impregnate the preheated continuous fiber cloth, and finally heats and solidifies the impregnated MC nylon prepolymer to prepare the composite material pipe finished product, compared with the prior art, the process of the invention is simpler, the production period is short, the production efficiency is high, the prepared composite material pipe has higher overall mechanical property, and has the characteristics of high strength, corrosion resistance, high compression resistance and light weight, the application range is wider, and the invention is especially suitable for being used under severe working conditions: such as high temperature, corrosion, high strength, impact, etc.)

1. The light high-pressure-resistant composite pipe is characterized by comprising a plastic inner layer pipe, continuous fiber cloth wound on the plastic inner layer pipe, and MC nylon impregnated and heated and cured on the continuous fiber cloth.

2. The light-weight high-pressure-resistant composite pipe material as claimed in claim 1, wherein the plastic inner layer pipe is a nylon pipe or a polyester pipe.

3. The light high-pressure-resistant composite pipe material as claimed in claim 1, wherein the continuous fiber cloth is any one of glass fiber cloth, carbon fiber cloth, aramid fiber cloth, basalt fiber cloth or blended fiber cloth.

4. A method for producing a lightweight high pressure resistant composite pipe according to any one of claims 1 to 3, characterized in that the method comprises the steps of:

sleeving a plastic inner-layer pipe on the pipeline core rod, and winding continuous fiber cloth on the plastic inner-layer pipe to obtain a first intermediate product;

preheating the first intermediate product;

pouring and dipping the preheated first intermediate product by adopting an MC nylon prepolymer to obtain a second intermediate product;

heating and curing the second intermediate product;

and cooling the second intermediate product after heating and curing, and removing the pipeline core rod from the cooled second intermediate product to obtain a composite material pipe finished product.

5. The preparation method of the light high-pressure-resistant composite pipe material as claimed in claim 4, wherein when the preheated first intermediate product is cast and impregnated by the MC nylon prepolymer, the impregnation area is vacuumized to form negative pressure so as to remove air in the continuous fiber cloth.

6. The light high-pressure-resistant composite pipe as claimed in claim 4, wherein the MC nylon prepolymer is prepared by adding sodium hydroxide into vacuum-dehydrated caprolactam solution to react, vacuum-dehydrating again, and mixing with TDI.

7. A system for preparing the light weight high pressure resistant composite material pipe material according to any one of claims 1 to 3, which comprises a preheating device, an impregnation device and a heating and curing device which are arranged in sequence; the preheating device is provided with a first traction channel which is horizontally arranged; the dipping device is provided with a second traction channel which is horizontally arranged; the heating and curing device is provided with a third traction channel which is horizontally arranged; the first traction channel, the second traction channel and the third traction channel are positioned on the same horizontal line; and a pouring port for pouring the MC nylon prepolymer is arranged at the top of the dipping device.

8. The system for preparing the light high-pressure-resistant composite pipe according to claim 7, wherein a vacuumizing interface is further arranged at the top of the impregnation device; and one end of the second traction channel, which is relatively close to the first traction channel, is provided with a circle of sealing ring.

9. The system for preparing a lightweight high pressure composite pipe according to claim 7, wherein the third drawing channel has a tapered opening on a side thereof relatively close to the second drawing channel; the large opening end of the conical opening faces the second traction channel.

10. The system for preparing the light weight high pressure composite material pipe material according to claim 7, wherein a plurality of first heating pipes and a plurality of first fans are arranged in the preheating device; and a plurality of second heating pipes and a plurality of second fans are arranged in the heating and curing device.

Technical Field

The application relates to the technical field of composite material pipes, in particular to a light high-pressure-resistant composite material pipe, a preparation method and a preparation system.

Background

The metal pipeline has strong bearing capacity, but is not corrosion-resistant, has heavier mass, is inconvenient to install and transport and has high cost. The plastic pipeline is light in weight, but has much lower strength than metal, and is not resistant to high pressure and high temperature. Under the working conditions of pipelines with severe environment, high pressure and temperature resistance, great cost needs to be invested for maintaining the anti-corrosion effect of metal pipelines. The corrosion-resistant and high-pressure-resistant plastic composite material pipeline is developed, and besides the lightweight effect is achieved, the construction and maintenance cost can be reduced. In order to prepare a high-pressure-resistant plastic composite material pipeline, a more conventional process is to impregnate a fiber bundle with epoxy resin or unsaturated polyester, wind the fiber bundle, and cure the fiber bundle at normal temperature or under heating to prepare the composite material pipeline. The molding method has a very long production period, and the adopted epoxy resin and unsaturated polyester pollute the environment in the using process, and on the other hand, the pipelines are difficult to recover and have great harm to the environment. Therefore, the application provides a light high-pressure-resistant composite pipe, a preparation method and a preparation system.

Disclosure of Invention

The application aims to solve the problems and provide a light high-pressure-resistant composite pipe, a preparation method and a preparation system.

In a first aspect, the present application provides a lightweight high pressure resistant composite tubing comprising a plastic inner tube, a continuous fiber cloth wound around the plastic inner tube, and MC nylon impregnated and heat cured on the continuous fiber cloth.

According to the technical scheme provided by certain embodiments of the application, the plastic inner-layer pipe is a nylon pipe or a polyester pipe.

According to the technical scheme provided by some embodiments of the application, the continuous fiber cloth is any one of glass fiber cloth, carbon fiber cloth, aramid fiber cloth, basalt fiber cloth or blended fiber cloth.

In a second aspect, the present application provides a method for preparing a light high pressure resistant composite pipe as described above, the method comprising the following steps:

sleeving a plastic inner-layer pipe on the pipeline core rod, and winding continuous fiber cloth on the plastic inner-layer pipe to obtain a first intermediate product;

preheating the first intermediate product;

pouring and dipping the preheated first intermediate product by adopting an MC nylon prepolymer to obtain a second intermediate product;

heating and curing the second intermediate product;

and cooling the second intermediate product after heating and curing, and removing the pipeline core rod from the cooled second intermediate product to obtain a composite material pipe finished product.

According to the technical scheme provided by some embodiments of the application, when the preheated first intermediate product is poured and impregnated by adopting the MC nylon prepolymer, the impregnation area is vacuumized to form negative pressure so as to remove air in the continuous fiber cloth.

According to the technical scheme provided by some embodiments of the application, the MC nylon prepolymer is obtained by adding sodium hydroxide into caprolactam solution after vacuum dehydration for reaction, then performing vacuum dehydration again, and then uniformly mixing with a curing agent TDI.

In a third aspect, the application provides a system for preparing the light high-pressure-resistant composite pipe, which comprises a preheating device, an impregnation device and a heating and curing device which are sequentially arranged; the preheating device is provided with a first traction channel which is horizontally arranged; the dipping device is provided with a second traction channel which is horizontally arranged; the heating and curing device is provided with a third traction channel which is horizontally arranged; the first traction channel, the second traction channel and the third traction channel are positioned on the same horizontal line; and a pouring port for pouring the MC nylon prepolymer is arranged at the top of the dipping device.

According to the technical scheme provided by some embodiments of the application, the top of the impregnation device is also provided with a vacuum pumping interface; and one end of the second traction channel, which is relatively close to the first traction channel, is provided with a circle of sealing ring.

According to the technical scheme provided by some embodiments of the application, one side of the third traction channel, which is relatively close to the second traction channel, is provided with a conical opening; the large opening end of the conical opening faces the second traction channel.

According to the technical scheme provided by some embodiments of the application, a plurality of first heating pipes and a plurality of first fans are arranged in the preheating device; and a plurality of second heating pipes and a plurality of second fans are arranged in the heating and curing device.

Compared with the prior art, the beneficial effect of this application: the method comprises the steps of winding continuous fiber cloth on a pipeline core rod and preheating the continuous fiber cloth by using MC nylon as a resin base material and the continuous fiber cloth as a reinforcing framework, then impregnating the preheated continuous fiber cloth by using an MC nylon prepolymer, and finally heating and curing the impregnated MC nylon prepolymer to obtain a composite material pipe finished product. Compared with the process for preparing the composite material pipe by impregnating the fiber bundles and winding the fiber bundles firstly in the prior art, the process is simpler, the production period is short, the production efficiency is high, the prepared composite material pipe has higher overall mechanical performance, has the characteristics of high strength, corrosion resistance, high compression resistance and light weight, has wider application range, and is particularly suitable for being used under severe working conditions: such as high temperature, corrosion, high strength, impact, etc.

Drawings

Fig. 1 is a schematic structural diagram of a system for preparing a lightweight high-pressure-resistant composite pipe provided in example 2 of the present application;

fig. 2 is a schematic partial enlarged view of an impregnation device of a system for manufacturing a lightweight high-pressure-resistant composite pipe according to embodiment 2 of the present application;

fig. 3 is a schematic cross-sectional structural diagram of an impregnation device of a system for preparing a lightweight high-pressure-resistant composite pipe provided in example 2 of the present application;

fig. 4 is a schematic structural diagram of a pouring device of a system for preparing a lightweight high-pressure-resistant composite pipe material provided in example 2 of the present application.

The text labels in the figures are represented as:

1. the rear end draws the guide support rod; 2. a support frame; 3. a preheating device; 4. a first fan; 5. a first heating pipe; 6. a seal ring; 7. a liquid level observation window; 8. vacuumizing the interface; 9. a vertical partition; 10. a pouring gate; 11. a continuous fiber cloth; 12. a plastic inner tube; 13. a heating and curing device; 14. a pipe core rod; 15. the front end draws the guide support rod; 16. a traction device; 17. a filter screen; 18. a control valve; 19. a first container; 20. a second container.

Detailed Description

The following detailed description of the present application is given for the purpose of enabling those skilled in the art to better understand the technical solutions of the present application, and the description in this section is only exemplary and explanatory, and should not be taken as limiting the scope of the present application in any way.

Example 1

The embodiment provides a light high-pressure-resistant composite material pipe which comprises a plastic inner layer pipe, a continuous fiber cloth wound on the plastic inner layer pipe, and MC nylon impregnated and cured on the continuous fiber cloth by heating.

The plastic inner layer pipe is a nylon pipe or a polyester pipe, the thickness of the plastic inner layer pipe is 1-10mm, and the arrangement of the plastic inner layer pipe can prevent resin from directly contacting and solidifying with a pipeline core rod and is difficult to demould in the preparation process of the composite material pipe; on the other hand, the smoothness of the inner wall of the prepared pipe can be ensured, and the reduction of the fluid resistance is facilitated when the pipe is used.

The gram weight of the continuous fiber cloth is 50-1000g/m²In the present application, the continuous fiber cloth is any one of glass fiber cloth, carbon fiber cloth, aramid fiber cloth, basalt fiber cloth, or blended fiber cloth.

The MC nylon prepolymer is obtained by adding sodium hydroxide into caprolactam solution after vacuum dehydration for reaction, then performing vacuum dehydration again, and then uniformly mixing with a curing agent TDI. Specifically, the caprolactam solution is dehydrated in vacuum at the temperature of 135-145 ℃, 0.3-0.7% of sodium hydroxide is added, the vacuum dehydration is carried out again, and the caprolactam solution and the TDI are uniformly mixed, wherein the mixing ratio is 100: 0.7-1.5.

The light high-pressure-resistant composite pipe provided by the application adopts continuous fiber cloth as a framework and MC nylon as a matrix, and has the characteristics of higher strength and high pressure resistance compared with the conventional plastic pipe; wherein the MC nylon is thermoplastic resin, so the composite material pipe can be recycled and reused.

Example 2

Referring to fig. 1, the present embodiment provides a system for preparing the light high pressure resistant composite material pipe as described in embodiment 1, the system includes a preheating device 3, an impregnation device and a heating and curing device 13, which are sequentially arranged from left to right; the preheating device 3 is provided with a first traction channel which is horizontally arranged; the dipping device is provided with a second traction channel which is horizontally arranged; the heating and curing device 13 is provided with a third drawing channel which is horizontally arranged; the first traction channel, the second traction channel and the third traction channel are positioned on the same horizontal line.

The preheating device 3 is provided with a support frame 2 on one side relatively far away from the dipping device, when the composite material pipe is prepared, one end of a pipeline core rod 14 is connected with a front end traction guide support rod 15, the other end of the pipeline core rod is connected with a rear end traction guide support rod 1, a traction device 16 is connected with the front end traction guide support rod 15, the rear end traction guide support rod 1 is lapped on the support frame 2, the traction device 16 pulls the pipeline core rod 14 wound with the continuous fiber cloth 11 to move at a constant speed in the horizontal direction, the pipeline core rod sequentially passes through a first traction channel of the prefabricating device, a second traction channel of the dipping device and a third traction channel of a heating and curing device 13 in the moving process, and the traction speed of the traction device 16 is 0.1-1 m/min.

A plurality of first heating pipes 5 and a plurality of first fans 4 are arranged in the preheating device 3 and are used for preheating the continuous fiber cloth 11 on the pipeline core rod 14 passing through the first traction channel; the preheating temperature of the preheating device 3 is 180-220 ℃.

Referring to fig. 2 and 3, a vertical partition 9 is provided in the dipping device; the vertical partition plate 9 divides the interior of the impregnation device into a vacuum adsorption chamber and a liquid pouring chamber; the top of the dipping device is provided with a vacuumizing interface 8 and a pouring port 10 for pouring the MC nylon prepolymer; the vacuumizing interface 8 and the pouring gate 10 are respectively positioned at two sides of the vertical partition plate 9, the pouring gate 10 is relatively close to the heating and curing device 13 and is connected with the liquid pouring cavity, and the vacuumizing interface 8 is relatively close to the preheating device 3 and is communicated with the vacuum adsorption cavity.

The pouring gate 10 on the dipping device is used for connecting a pouring device, the structure of the pouring device is shown in figure 4, and the pouring device comprises a first container 19 for containing a solution obtained by reacting open-loop dehydrated caprolactam with sodium hydroxide and performing vacuum dehydration again, a second container 20 for containing a curing agent TDI, a liquid inlet pipe communicated with the pouring gate 10, a first branch pipe for communicating the first container 19 with the liquid inlet pipe, and a second branch pipe for communicating the second container 20 with the liquid inlet pipe; wherein, the first branch pipe and the second branch pipe are respectively provided with a control valve 18, and the liquid inlet pipe is internally provided with a filter screen 17.

The vacuumizing interface 8 on the dipping device is used for being connected with the vacuumizing device, when the continuous fiber cloth 11 wound on the pipeline core rod 14 is dipped by the MC nylon prepolymer, the vacuumizing device is opened for vacuumizing, a certain negative pressure effect can be achieved, and the air in the continuous fiber cloth 11 can be discharged.

The top of the dipping device is also provided with a liquid level observation window 7, the liquid level observation window is provided with a liquid level mark, the liquid level observation window 7 is used for observing the liquid level position of the MC nylon prepolymer in the dipping area, and the liquid level position of the MC nylon prepolymer in the dipping area is ensured to be below the liquid level mark by controlling the pouring speed.

A plurality of second heating pipes and a plurality of second fans are arranged in the heating and curing device 13 and are used for heating and curing the continuous fiber cloth 11 which passes through the third traction channel and is impregnated with the MC nylon prepolymer on the pipeline core rod 14; the heating and curing temperature of the heating and curing device 13 is 160-200 ℃.

Furthermore, a ring of high temperature resistant rubber sealing ring 6 is arranged at one end of the second drawing channel, which is relatively close to the first drawing channel, so that a small pressure can be applied to the continuous fiber cloth 11 wound on the pipeline core rod 14, and simultaneously, the impregnation liquid can be prevented from flowing out from the inlet of the second drawing channel, namely, leakage can be prevented.

Further, one side of the third drawing channel, which is relatively close to the second drawing channel, is provided with a conical opening; the large opening end of the conical opening faces the second traction channel, and in the moving process of the pipeline core rod 14, the conical opening is designed to facilitate the pipeline core rod 14 to enter the third traction channel and gradually extrude the pipeline core rod 14, so that the dipping effect of the MC nylon prepolymer and the continuous fiber cloth 11 is improved.

When the preparation system is used for preparing the composite material pipe, the traction device 16 is connected with the pipeline core rod 14, the pipeline core rod 14 wound with the continuous fiber cloth 11 is drawn to move at a constant speed in the horizontal direction, the continuous fiber cloth 11 is preheated by the preheating device 3, the MC nylon prepolymer impregnated on the continuous fiber cloth 11 by the impregnating device is impregnated in the continuous fiber cloth 11, and the MC nylon prepolymer impregnated on the continuous fiber cloth 11 is subjected to heating and curing treatment by the heating and curing device 13 in the moving process.

Example 3

This example provides a method for preparing the lightweight high pressure resistant composite tubing material of example 1 using the preparation system of example 2, wherein the continuous fiber cloth is glass fiber cloth with a specification of 400g/m²And the width is 40 cm. The method comprises the following steps:

a. preparing a smooth pipeline core rod 14 with the length of 4m and the diameter of 80mm, respectively connecting a thin traction rod (namely a front end traction guide support rod 15 and a rear end traction guide support rod 1) at two ends of the pipeline core rod by screw threads, and sleeving a nylon pipe (namely a plastic inner-layer pipe 12) with the wall thickness of 4mm on the pipeline core rod 14;

b. winding 400g/m on a nylon pipe²The winding wall thickness of the glass fiber cloth is 6mm, and a first intermediate product is obtained; wherein, the winding force of the glass fiber cloth is not suitable to be too large, and after winding is finished, the glass fiber cloth has certain looseness which is kept between 0.5 and 3 mm;

c. placing the first intermediate product at the inlet end of a first traction channel of the preparation system, and using a traction device 16 to pull a front end traction guide support rod 15 to drive the first intermediate product to move, wherein the traction direction is from the first traction channel to a third traction channel, and the traction speed is 0.1 m/min;

d. when the first intermediate product is drawn into the first drawing channel (namely the preheating area), the preheating device 3 preheats the glass fiber cloth wound on the pipeline core rod 14, and the temperature of the preheating device 3 is set to be 200 ℃; the continuous fiber cloth is preheated to improve the temperature of the continuous fiber cloth, and after the continuous fiber cloth is impregnated by the MC nylon prepolymer, the temperature of the continuous fiber cloth can be quickly increased to a curing temperature range of the MC nylon prepolymer, so that the MC nylon prepolymer can be normally cured, and the influence of water molecules in raw materials on the curing process of the MC nylon prepolymer can be eliminated;

e. when the preheated first intermediate product is drawn into a second drawing channel (namely an impregnation area), a control valve 18 on a pouring device is opened, and the MC nylon prepolymer is poured onto the glass fiber cloth through a pouring gate 10 to impregnate the continuous glass fiber cloth, so that a second intermediate product is obtained; while pouring, opening a vacuum device (a vacuum pump) and vacuumizing through the vacuumizing interface 8 to ensure that the whole dipping area has certain negative pressure so as to discharge air in the glass fiber cloth; during pouring, the liquid level condition of the dipping area is observed through the liquid level observation window 7, the pouring speed is adjusted according to the observation result, and the liquid level position of the MC nylon prepolymer is kept below the liquid level mark; in the traction process, the continuous fiber cloth on the pipeline core rod is pultruded in the impregnating liquid to move, the impregnating of the impregnating liquid on the continuous fiber cloth is increased in the process, and the combination degree of the continuous fiber cloth and the MC nylon prepolymer is improved;

f. when the second intermediate product is drawn into a third drawing channel (namely a heating and curing area), the heating and curing device 13 heats and cures the MC nylon prepolymer impregnated on the continuous glass fiber cloth, and the temperature of the heating and curing device 13 is set to 180 ℃;

g. and gradually curing and molding the MC nylon prepolymer impregnated on the continuous glass fiber cloth, continuously drawing the second intermediate product from the third drawing channel to the outside for cooling, and removing the pipeline core rod 14 on the second intermediate product after cooling for 20 minutes to obtain a composite pipe finished product, namely the continuous glass fiber cloth reinforced MC nylon composite pipeline. In the step, the cooling time is controlled to be 15-20 minutes, and the pipeline core rod still has certain temperature, so that the pipeline core rod 14 can be conveniently and quickly taken down.

The curved surface of the continuous glass fiber cloth reinforced MC nylon composite material pipeline prepared by the preparation method is bent, the pipeline is split, heated and softened, flattened to prepare a plate, cut to obtain a standard sample, and the standard sample is subjected to tensile, bending and impact tests, wherein the test results are shown in Table 1.

TABLE 1

Item	Test results	Unit of	Test method
				Density of	1.61	g/cm3	ISO 1183
Tensile strength	270	MPa	ISO 527-1-2
				Bending strength	210	MPa	ISO 178
Unnotched impact strength	82	KJ/m2	ISO 179
				Fiber content	45	％	Internal testing
Pressure testing	26	MPa	GB/T 20801.5

As can be seen from table 1, the composite pipe prepared by the preparation method provided in this embodiment has the characteristics of light weight and high strength.

Example 4

This example provides a method for preparing the lightweight high pressure resistant composite tubing material of example 1 using the preparation system of example 2, wherein the continuous fiber cloth is carbon fiber cloth with a specification of 3K, 200g/m²The width is 40 cm; the specific method steps are the same as those in example 3, and are not repeated here, and the final composite pipe product obtained by the preparation, namely the continuous carbon fiber cloth reinforced MC nylon composite pipe, is tested by the same test method as that in example 3, and the obtained test results are shown in table 2.

TABLE 2

Item	Test results	Unit of	Test method
				Density of	1.34	g/cm3	ISO 1183
Tensile strength	762	MPa	ISO 527-1-2
				Bending strength	540	MPa	ISO 178
Unnotched impact strength	79	KJ/m2	ISO 179
				Fiber content	37	％	Internal testing
Pressure testing	38	MPa	GB/T 20801.5

As can be seen from table 2, the composite pipe prepared by the preparation method provided in this embodiment has the characteristics of light weight and high strength.

Example 5

This example provides a method for preparing the lightweight high pressure resistant composite pipe as described in example 1 by using the preparation system as described in example 2, in this example, the continuous fiber cloth is aramid fiber cloth with specification of 800D, 130g/m²The width is 40 cm; the specific method steps are the same as those in example 3, and are not repeated here, and the final composite pipe product obtained by the preparation, namely the continuous aramid fiber cloth reinforced MC nylon composite pipe, is tested by the same test method as that in example 3, and the obtained test results are shown in table 3.

TABLE 3

Item	Test results	Unit of	Test method
				Density of	1.21	g/cm3	ISO 1183
Tensile strength	245	MPa	ISO 527-1-2
				Bending strength	220	MPa	ISO 178
Unnotched impact strength	91	KJ/m2	ISO 179
				Fiber content	31	％	Internal testing
Pressure testing	27	MPa	GB/T 20801.5

As can be seen from table 3, the composite pipe prepared by the preparation method provided in this embodiment has the characteristics of light weight and high strength.

The invention adopts the mode of MC nylon prepolymer substrate and winding continuous fiber cloth, firstly winding the continuous fiber cloth on the pipeline core rod and preheating the continuous fiber cloth, then dipping the preheated continuous fiber cloth by the MC nylon prepolymer, and finally heating and curing the dipped MC nylon prepolymer to prepare the composite material pipe finished product, compared with the process for preparing the composite material pipe by dipping the fiber bundle and winding the fiber bundle in the prior art, the process of the invention is simpler, the production period is short, the production efficiency is high, the prepared composite material pipe has higher overall mechanical property, has the characteristics of high strength, corrosion resistance, high compression resistance and light weight, has wider application range, and is particularly suitable for being used under severe working conditions: such as high temperature, corrosion, high strength, impact, etc.

The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that there are no specific structures which are objectively limitless due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the technical features mentioned above can be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention in other instances, which may or may not be practiced, are intended to be within the scope of the present application.