WO2022099541A1

WO2022099541A1 - Gas cylinder and manufacturing method therefor

Info

Publication number: WO2022099541A1
Application number: PCT/CN2020/128356
Authority: WO
Inventors: 行武壮太郎
Original assignee: 深圳烯湾科技有限公司
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2022-05-19
Also published as: CN116490719A

Abstract

The present application provides a gas cylinder (100) and a manufacturing method therefor. The gas cylinder (100) comprises a resin liner (10) and a reinforcing layer (20) wound and fixed on the outer side of the resin liner (10); the resin liner (10) is made of a composite material obtained by uniformly dispersing carbon nanotubes in a thermoplastic resin; and the carbon nanotubes accounts for 0.01-10wt% of the resin liner (10). In the gas cylinder (100) of the present application, the carbon nanotubes are uniformly mixed into the thermoplastic resin, such that a network structure of carbon nanotubes can be formed in the resin liner (10) obtained, thereby increasing the mechanical strength of the resin liner (10), shortening the production time, lowering the production cost, reducing the thermal expansion coefficient of the thermoplastic resin, preventing formation of gaps between the resin liner (10) and the reinforcing layer (20) and thus prolonging the service life of the gas cylinder (100), increasing the thermal conductivity of the resin liner (10), saving the manufacturing and maintenance costs of devices, lowering the installation space requirement, increasing the electrical conductivity of the resin liner (10), and preventing static electricity accumulation of the gas cylinder (100) and thus lowering the gas explosion risk.

Description

Gas tank and method of making the same

technical field

The present application relates to the technical field of high-pressure containers, in particular to a gas storage tank and a manufacturing method thereof.

Background technique

The statements herein merely provide background information related to the present application and do not necessarily constitute prior art. With the development of hydrogen energy vehicles, not only the requirements for hydrogen storage containers are light, compact, safe and economical, but also to meet the requirements of the car's battery life, at least 500 kilometers, so the hydrogen storage technology has become more and more demanding. requirements. While there are a wide variety of hydrogen storage technologies, none can fully meet all the requirements of the automotive industry. In fact, finding solutions to the hydrogen storage problem is considered by many to be the primary challenge of the hydrogen economy.

The hydrogen storage container is produced by winding carbon fiber reinforced composite material (CFRP) on the outside of the gas container liner. The inner liner is made of thermoplastic resins such as nylon 6 and high-density polyethylene, and is made by molding methods such as injection molding or extrusion molding. Inner bladders made of thermoplastic resins such as nylon 6 and high-density polyethylene alone cannot achieve the strength to withstand the filling/release cycle of high-pressure gas.

Therefore, in the prior art, it is necessary to wind the filamentary carbon fibers by the filament winding method to strengthen the resin liner, thereby making the hydrogen storage container. However, in the first aspect, the hydrogen storage container made by the existing filament winding method takes a long time and has low production efficiency. It is necessary to wind enough carbon fibers to make the inner tank reach the required strength, resulting in a limited number of storage tanks that can be produced per day. . Second, according to the cycle of the gas charging and discharging process, the hydrogen storage container will continue to expand and contract. Through such an expansion/contraction cycle, the inner liner will be fatigued and damaged; in addition, if the inner liner and carbon fiber reinforced composite material are repeated Expansion/contraction, there will be a gap between the inner tank and the carbon fiber reinforced composite material layer, so that the carbon fiber reinforced composite material cannot guarantee the strength of the resin inner tank. Thirdly, when filling the hydrogen storage container, the temperature of the hydrogen storage container will rise due to the poor heat dissipation effect of the hydrogen storage container. In order to prevent the hydrogen storage container from abnormally heating due to rapid filling, the gas The rate of filling, or pre-cooling of the gas prior to filling, in turn results in the need for cooling equipment, which requires energy to operate. That is, in terms of cost, an increase in the cost of the inflator and an increase in the operating cost of the cooling device are required. Fourthly, the electrical conductivity of the liner of the hydrogen storage container is low, so the static electricity of the hydrogen storage container is difficult to export. If the hydrogen leaks from the storage tank, it may cause an electrostatic explosion.

technical problem

One of the purposes of the embodiments of the present application is to provide a gas storage tank and a manufacturing method thereof, so as to solve the problems of low mechanical strength, high thermal expansion coefficient, poor thermal conductivity and electrical conductivity in the use of the hydrogen storage container in the prior art technical issues.

technical solutions

In order to solve the above-mentioned technical problems, the technical solutions adopted in the embodiments of the present application are:

In the first aspect, an air storage tank is provided, which includes a resin liner and a reinforcing layer wound and fixed on the outside of the resin liner, and the resin liner is a composite obtained by uniformly dispersing carbon nanotubes in a thermoplastic resin. material; the content of the carbon nanotubes accounts for 0.01-10wt% of the resin liner.

In one embodiment, the content of the carbon nanotubes accounts for 0.1-5 wt % of the resin liner.

In one embodiment, the ratio of the wall thickness of the resin liner to the wall thickness of the reinforcing layer is between 1:0.1 and 1:3.2.

In one embodiment, the thermoplastic resin includes at least one of nylon 6, high density polyethylene, and polystyrene.

In one embodiment, the length of the carbon nanotube is 0.01 mm˜1000 mm; and/or the diameter of the carbon nanotube is 1 nm˜1000 nm.

In one embodiment, the reinforcing layer includes at least reinforcing fibers, and the reinforcing fibers include at least one of carbon fibers, glass fibers, and carbon nanotube fibers.

In one embodiment, the reinforcing fiber is a reinforcing fiber pre-impregnated with a thermosetting resin, and the reinforcing fiber will be cured after being wound on the outer peripheral wall of the resin liner, and the thermosetting resin is epoxy resin, not One or more of saturated polyester resin, polyamide resin and vinyl resin.

In a second aspect, there is provided a method for manufacturing an air storage tank as described above, comprising the steps of:

adding the carbon nanotubes to the thermoplastic resin, and kneading the thermoplastic resin and the carbon nanotubes by applying shear force, so that the carbon nanotubes are uniformly dispersed in the thermoplastic resin;

The kneaded thermoplastic resin and the carbon nanotubes are made into the resin liner, and the reinforcing layer is wound on the outside of the resin liner to obtain the air storage tank.

In one embodiment, when the thermoplastic resin and the carbon nanotubes are kneaded by applying shear force, a dispersant is also added.

In one embodiment, the winding method of wrapping the reinforcing layer on the outside of the resin liner includes one of hoop wrapping, helical wrapping and planar wrapping.

In one embodiment, after the reinforcing layer is wound on the outer side of the resin liner, the method further includes a step of: providing energy required for curing to perform curing treatment on the resin liner wound with the reinforcing layer.

beneficial effect

The beneficial effect of the air storage tank provided by the embodiment of the present application is that: by uniformly mixing the carbon nanotubes into the thermoplastic resin, a network structure of carbon nanotubes can be formed in the prepared resin liner, thereby improving the performance of the resin liner. The mechanical strength shortens the production time and reduces the production cost; it can reduce the thermal expansion coefficient of the thermoplastic resin, can avoid the gap between the resin liner and the reinforcement layer, and is beneficial to prolong the service life of the air storage tank; can improve the resin liner It improves the thermal conductivity of the resin liner, improves the heat dissipation effect of the resin liner, saves the manufacturing and maintenance costs of the equipment, and reduces the installation space requirement; improves the electrical conductivity of the resin liner, which can prevent the accumulation of static electricity in the gas tank and reduce the risk of gas explosion sex.

The beneficial effect of the manufacturing method of the gas storage tank provided by the embodiment of the present application is that: by kneading the thermoplastic resin and the carbon nanotubes by applying shearing force, the carbon nanotubes are uniformly dispersed in the thermoplastic resin, and then the carbon nanotubes are uniformly dispersed in the thermoplastic resin. The network structure of carbon nanotubes can be formed in the resin liner, which not only improves the comprehensive performance of the resin liner, but also reduces the thickness of the reinforcing layer, shortens the time of the filament winding process, and reduces the production cost.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or exemplary technologies. Obviously, the drawings in the following description are only for the present application. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a cross-sectional structural diagram of a gas storage tank provided by an embodiment of the present application.

Embodiments of the present invention

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present application.

It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description, rather than indicating or implying the referred device Or the elements must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be construed as a limitation to the present application, and those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations. The terms "first" and "second" are only used for the purpose of description, and should not be understood as indicating or implying relative importance or implying indicating the number of technical features. "Plurality" means two or more, unless expressly specifically limited otherwise.

In order to illustrate the technical solutions described in the present application, a detailed description is given below with reference to the specific drawings and embodiments.

Referring to FIG. 1 , the gas storage tank 100 provided by the embodiment of the present application will now be described. The air tank 100 includes a resin inner liner 10 and a reinforcing layer 20 wound and fixed on the outer side of the resin inner liner 10 .

The resin liner 10 is made of a composite material obtained by uniformly dispersing carbon nanotubes in a thermoplastic resin, and the content of carbon nanotubes accounts for 0.01-10 wt % of the resin liner 10 .

It can be understood that the resin liner 10 is composed of thermoplastic resin and 0.01-10 wt % of carbon nanotubes. First, by uniformly mixing carbon nanotubes into the thermoplastic resin, a network structure of carbon nanotubes can be formed in the prepared resin liner 10, and the network structure of carbon nanotubes has the characteristics of high strength and high toughness, Thus, the mechanical strength of the resin liner 10 is improved. Therefore, the reinforcing layer 20 wound to achieve the required strength of the gas storage tank 100 can be thinner, which shortens the time of the filament winding process, that is, the production time is shortened, and the production cost is reduced. Second, by uniformly mixing the carbon nanotubes into the thermoplastic resin, the thermal expansion coefficient of the thermoplastic resin can be reduced, that is, the expansion/contraction of the resin liner 10 during the long-term cycle of filling/releasing the gas tank 100 degree is also reduced. In this way, a gap between the resin inner tank 10 and the reinforcing layer 20 can be avoided, which is beneficial to prolong the service life of the air storage tank 100 . In the third aspect, by uniformly mixing the carbon nanotubes into the thermoplastic resin, the thermal conductivity of the resin liner 10 can also be improved, so that the heat in the resin liner 10 is easily released when the gas is filled, and the resin liner 10 has a high thermal conductivity. The temperature rise phenomenon is also improved. Furthermore, it is not necessary to use a cooling device to perform auxiliary heat dissipation and cooling for the resin liner 10 , which saves the manufacturing and maintenance costs of the device, and reduces the installation space requirement. Fourth, by uniformly mixing the carbon nanotubes into the thermoplastic resin, the electrical conductivity of the resin liner 10 can be improved, and the accumulation of static electricity in the air tank 100 can be prevented. Therefore, even if hydrogen leakage occurs, sparks caused by static electricity can be avoided, reducing the risk of gas explosion.

Compared with the prior art, the gas storage tank 100 provided by the present application can form a network structure of carbon nanotubes in the resin liner 10 by uniformly mixing carbon nanotubes into the thermoplastic resin, thereby improving the performance of the resin. The mechanical strength of the inner tank 10 shortens the production time and reduces the production cost; the thermal expansion coefficient of the thermoplastic resin can be reduced, the gap between the resin inner tank 10 and the reinforcing layer 20 can be avoided, and the use of the gas storage tank 100 can be prolonged. It can improve the thermal conductivity of the resin liner 10, improve the heat dissipation effect of the resin liner 10, save the manufacturing and maintenance costs of the equipment, and reduce the installation space requirement; improve the electrical conductivity of the resin liner 10, which can prevent storage The gas tank 100 accumulates static electricity to reduce the risk of gas explosion.

In another embodiment of the present application, the content of carbon nanotubes accounts for 0.1-5 wt % of the resin liner 10 . It can be understood that when the content of carbon nanotubes is too high, carbon nanotubes will agglomerate in the thermoplastic resin in large quantities. Even if sufficient shear force is applied for kneading, it is difficult to disperse carbon nanotubes uniformly. The influence of thermal expansion coefficient and mechanical strength of bladder 10 becomes small; when the content of carbon nanotubes is too low, even if sufficient shear force is applied to knead and disperse uniformly, but the content of carbon nanotubes is too low, it is impossible to form a complete The carbon nanotube network structure has little effect on the physical properties such as thermal expansion coefficient, mechanical strength, thermal conductivity and volume resistivity of the resin liner 10; therefore, when the content of carbon nanotubes accounts for 0.1~ At 5wt%, the overall performance of the resin liner 10 is the best in terms of thermal expansion coefficient, mechanical strength, thermal conductivity, volume resistivity and other physical properties.

In another embodiment of the present application, the ratio of the wall thickness of the resin liner 10 to the wall thickness of the reinforcing layer 20 is between 1:0.1 and 1:3.2. It can be understood that the reinforcing layer 20 can strengthen and fix the resin liner 10, so that the resin liner 10 can meet the strength requirements required by the air storage tank 100; When the strength is increased, the thickness of the reinforcing layer 20 can be appropriately reduced, thereby shortening the time of the filament winding process, that is, the production time is shortened, and the production cost is reduced. Preferably, the ratio of the wall thickness of the resin liner 10 to the wall thickness of the reinforcing layer 20 is between 1:0.125 and 1:1.0. For example: the ratio of the wall thickness of the resin liner 10 to the wall thickness of the reinforcing layer 20 is 1:0.125 / 1:0.5 / 1:0.8 /1:1.0.

In another embodiment of the present application, the thermoplastic resin includes at least one of nylon 6, high density polyethylene (HDPE), and polystyrene. It is understandable that nylon 6, high-density polyethylene and polystyrene have a low melting point and a wide process temperature range, making them more convenient to manufacture as substrates; the disadvantage is the mechanical strength, electrical conductivity, and thermal conductivity after molding. It is not high enough. Among them, nylon 6, high-density polyethylene and polystyrene have thermal conductivity between 0.1 and 0.6W/(mK), and by uniformly mixing carbon nanotubes to nylon 6, high-density polyethylene and polystyrene In the thermoplastic resin with polystyrene as the base material, the shortcomings of the thermoplastic resin can be compensated, so that the performance of the resin liner 10 can be greatly improved.

In another embodiment of the present application, the length of the carbon nanotube is 0.01 mm˜1000 mm; and/or the diameter of the carbon nanotube is 1 nm˜1000 nm. It can be understood that the length and diameter of the carbon nanotubes have a direct impact on the thermal expansion coefficient, mechanical strength, thermal conductivity, volume resistivity and other physical properties of the resin liner 10 . For example, if the length of the carbon nanotubes is too long, it is not conducive to the sufficient dispersion of the carbon nanotubes in the resin liner 10; In the manufactured resin liner 10 , the length of the carbon nanotubes may be 0.1 mm˜1 mm; and/or, the diameter of the carbon nanotubes may be 1 nm˜100 nm, so that the carbon nanotubes can play the greatest role in the resin liner 10 . effect. For example: the length of the carbon nanotube is 0.1 mm; and/or the diameter of the carbon nanotube is 1 nm. The length of the carbon nanotubes is 0.2 mm; and/or the diameter of the carbon nanotubes is 20 nm. The length of the carbon nanotubes is 0.4 mm; and/or the diameter of the carbon nanotubes is 40 nm. The length of the carbon nanotubes is 0.6 mm; and/or the diameter of the carbon nanotubes is 60 nm. The length of the carbon nanotubes is 0.8 mm; and/or the diameter of the carbon nanotubes is 80 nm. The length of the carbon nanotubes is 0.1 mm; and/or the diameter of the carbon nanotubes is 100 nm.

In another embodiment of the present application, the reinforcing layer 20 includes at least reinforcing fibers, and the reinforcing fibers include at least one of carbon fibers, glass fibers, and carbon nanotube fibers. The reinforcing fibers may be carbon fibers. It can be understood that carbon fiber is a high-strength and high-modulus fiber with a carbon content of more than 90%. It can be made of acrylic fiber and viscose fiber through high-temperature oxidation and carbonization. The reinforcing fibers can be pre-impregnated with one or more of thermosetting resins such as epoxy resin, unsaturated polyester resin, polyamide resin, and vinyl resin to form a composite reinforcing material, and then wound to the outer side of the resin liner 10 to improve the resin inner liner. Strength, stiffness, crack resistance and extensibility of bladder 10.

The present invention also provides a method for manufacturing an air storage tank as described above, comprising the steps of: adding carbon nanotubes to the thermoplastic resin, and kneading the thermoplastic resin and the carbon nanotubes by applying shearing force, so as to make the carbon nanotubes The tube is uniformly dispersed in the thermoplastic resin; the kneaded thermoplastic resin and carbon nanotubes are made into a resin liner, and a reinforcing layer is wound on the outside of the resin liner to obtain an air storage tank.

It is worth noting that in the mechanics of materials, shear force, also known as shear force, refers to the force that can cause shear deformation of materials. On the other hand, in the manufacturing method of the gas storage tank of the present application, the thermoplastic resin and the carbon nanotubes are kneaded by applying sufficient shearing force, and the existing mechanical equipment such as a biaxial extruder or a grinder can be used. Mechanical equipment such as a shaft extruder or a grinder can apply sufficient shear force to knead the carbon nanotubes in the thermoplastic resin, so that the carbon nanotubes are pulverized and fully mixed with the thermoplastic resin.

Compared with the prior art, the manufacturing method of the gas storage tank provided by the present application, by kneading the thermoplastic resin and carbon nanotubes by applying shear force, so that the carbon nanotubes are uniformly dispersed in the thermoplastic resin, and then made into The network structure of carbon nanotubes can be formed in the resin liner, which not only improves the comprehensive performance of the resin liner, but also reduces the thickness of the reinforcing layer, shortens the time of the filament winding process, and reduces the production cost.

In another embodiment of the present application, when the thermoplastic resin and the carbon nanotubes are kneaded by applying sufficient shear force, a dispersant is also added. It can be understood that the types of dispersants can be cellulose derivatives, polyvinylpyrrolidone, polyvinyl alcohol, sodium lauryl sulfate, carbon nanotube ester dispersants and the like. The dispersant is preferably a carbon nanotube ester dispersant, such as a carbon nanotube ester dispersant with a product code of "JCEDIS"; the amount of the dispersant is preferably 1 to 1.2 times the content of carbon nanotubes. By adding the dispersant, the dispersibility of carbon nanotubes can be improved, the surface tension and surface energy of carbon nanotubes can be reduced, and the electrostatic force of non-chemical bonds can be weakened. It has the advantages of environment-friendly medium and uniform and stable structure. Therefore, by adding the dispersant, the carbon nanotubes can be dispersed more uniformly in the thermoplastic resin, and the electrical conductivity of the resin liner can be further improved.

In another embodiment of the present application, the winding method of wrapping the reinforcing layer on the outside of the resin liner includes one of hoop wrapping, helical wrapping and plane wrapping. It can be understood that hoop winding, helical winding and planar winding are all existing industrial winding forming processes. For example, when using hoop winding, the resin liner rotates on its own, the wire guide moves parallel to the axis in the length of the resin liner, and the carbon fibers derived from the guide wire are wound on the outside of the resin liner to form a reinforcement layer. Circumferential winding, helical winding and planar winding can all be performed using existing winding equipment, which is beneficial to saving equipment and R&D costs.

In another embodiment of the present application, after the reinforcing layer is wound on the outer side of the resin liner, the method further includes a step of: providing energy required for curing, and curing the resin liner wound with the reinforcing layer. It can be understood that since the reinforcing fibers in the reinforcing layer usually need to be pre-impregnated with thermosetting resin, the energy required for curing is provided, such as irradiating light or heat, and the resin liner wrapped with the reinforcing layer can be cured. The fast curing of the reinforcing fibers of the thermosetting resin is beneficial to reduce the formation time of the reinforcing layer and improve the production efficiency. Understandably, during curing, the temperature required for curing the thermosetting resin should be lower than the melting point of the thermoplastic resin in the resin liner, so that the reinforcing layer can be wound and cured on the outer peripheral wall of the resin liner without deformation of the resin liner.

In order to make the above-mentioned implementation details and operations of the present invention clearly understood by those skilled in the art, and to significantly reflect the improved performance of the gas storage tank and its manufacturing method according to the embodiment of the present invention, the above-mentioned technology is illustrated by several embodiments below. Program.

Example 1

A gas storage tank, comprising the following preparation steps:

Add 0.1wt% of carbon nanotubes to the high-density polyethylene, and mix the high-density polyethylene and the carbon nanotubes by applying sufficient shear force;

The kneaded high-density polyethylene and carbon nanotubes are made into a resin liner with a wall thickness of 4 mm, and a carbon fiber epoxy resin reinforced layer with a thickness of 2.5 mm is wound on the outside of the resin liner, and an air storage tank is obtained after curing.

Example 2

A gas storage tank, comprising the following preparation steps:

Adding 1wt% of carbon nanotubes to the high-density polyethylene, and mixing the high-density polyethylene and the carbon nanotubes by applying sufficient shear force;

Example 3

A gas storage tank, comprising the following preparation steps:

Adding 5wt% of carbon nanotubes to the high-density polyethylene, and kneading the high-density polyethylene and the carbon nanotubes by applying sufficient shear force;

Example 4

A gas storage tank, comprising the following preparation steps:

Add 10wt% of carbon nanotubes to the high-density polyethylene, and mix the high-density polyethylene and the carbon nanotubes by applying sufficient shear force;

Example 5

A gas storage tank, comprising the following preparation steps:

The kneaded high-density polyethylene and carbon nanotubes are made into a resin liner with a wall thickness of 4mm, and a carbon fiber epoxy resin reinforced layer with a thickness of 1.5mm is wound on the outside of the resin liner, and a gas storage tank is obtained after curing.

Example 6

A gas storage tank, comprising the following preparation steps:

The kneaded high-density polyethylene and carbon nanotubes are made into a resin liner with a wall thickness of 4 mm, and a carbon fiber epoxy resin reinforced layer with a thickness of 0.5 mm is wound on the outside of the resin liner, and a gas storage tank is obtained after curing.

Example 7

A gas storage tank, comprising the following preparation steps:

Add 1wt% of carbon nanotubes to nylon 6, and knead high-density polyethylene and carbon nanotubes by applying sufficient shear force;

Example 8

A gas storage tank, comprising the following preparation steps:

Add 5wt% carbon nanotubes to nylon 6, and mix the high-density polyethylene and carbon nanotubes by applying sufficient shear force;

Example 9

A gas storage tank, comprising the following preparation steps:

Add 10wt% carbon nanotubes to nylon 6, and mix the high-density polyethylene and carbon nanotubes by applying sufficient shear force;

Comparative Example 1

A gas storage tank, comprising the following preparation steps:

A carbon fiber epoxy resin reinforced layer with a thickness of 2.5 mm is wound on the outer side of a high-density polyethylene liner with a wall thickness of 4 mm, and an air storage tank is obtained after curing.

Comparative Example 2

A gas storage tank, comprising the following preparation steps:

A carbon fiber epoxy resin reinforced layer with a thickness of 8 mm is wound on the outer side of a high-density polyethylene liner with a wall thickness of 4 mm, and an air storage tank is obtained after curing.

Comparative Example 3

A gas storage tank, comprising the following preparation steps:

A carbon fiber epoxy resin reinforced layer with a thickness of 2.5 mm is wound on the outside of a nylon 6 liner with a wall thickness of 4 mm, and an air storage tank is obtained after curing.

Comparative Example 4

A gas storage tank, comprising the following preparation steps:

A carbon fiber epoxy resin reinforced layer with a thickness of 8 mm is wound on the outside of a nylon 6 inner tank with a wall thickness of 4 mm, and an air storage tank is obtained after curing.

Further, in order to verify the progress of the gas storage tanks prepared in the embodiments of the present invention, the gas storage tanks provided in Examples 1 to 9 of the present invention and Comparative Examples 1 to 4 were tested for comprehensive physical properties. The test results are as follows in Table 1 and Table 1. 2 shows:

Table 1

Table 2

It can be seen from the above test results that according to Examples 1 to 6 of the present invention and Comparative Examples 1 to 2, adding an appropriate amount of carbon nanotubes into the high-density polyethylene matrix can make the thermal conductivity of the gas storage tank higher and the volume resistivity higher. small, the thermal expansion coefficient is smaller, and the carbon fiber reinforced layer can make the maximum withstand working pressure larger even though the thickness is not high; according to Examples 7-9 and Comparative Examples 3-4 of the present invention, it can be seen that an appropriate amount of The carbon nanotubes can make the thermal conductivity of the gas storage tank larger, the volume resistivity smaller, and the thermal expansion coefficient smaller, and the carbon fiber reinforced layer can make the maximum working pressure resistance even though the thickness is not high.

Therefore, by adding 0.01 to 10 wt% of carbon nanotubes to the thermoplastic resin, and kneading the thermoplastic resin and carbon nanotubes by applying sufficient shearing force, the kneaded thermoplastic resin and carbon nanotubes are made into the resin. The air tank obtained by winding the reinforcement layer on the outside of the resin inner tank only needs to use a reinforcement layer thickness smaller than that of the conventional reinforcement layer, so that the thermal conductivity is larger, the volume resistivity is smaller, and the thermal expansion coefficient is smaller. , The maximum working pressure is greater.

The above are only optional embodiments of the present application, and are not intended to limit the present application. Various modifications and variations of this application are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

An air storage tank comprising a resin liner and a reinforcing layer wound and fixed on the outside of the resin liner, wherein the resin liner is made of a composite material obtained by uniformly dispersing carbon nanotubes in a thermoplastic resin. The content of the carbon nanotubes accounts for 0.01-10wt% of the resin liner.
The gas storage tank according to claim 1, wherein the content of the carbon nanotubes accounts for 0.1-5wt% of the resin liner.
The air storage tank according to claim 1, wherein the ratio of the wall thickness of the resin liner to the wall thickness of the reinforcing layer is between 1:0.1 and 1:3.2.
The gas storage tank according to claim 1, wherein the thermoplastic resin comprises at least one of nylon 6, high density polyethylene, and polystyrene.
The gas storage tank according to claim 1, wherein the carbon nanotubes have a length of 0.01 mm to 1000 mm; and/or the carbon nanotubes have a diameter of 1 nm to 1000 nm.
The gas storage tank according to claim 1, wherein the reinforcing layer at least comprises reinforcing fibers, and the reinforcing fibers comprise at least one of carbon fibers, glass fibers, and carbon nanotube fibers.
The air storage tank according to claim 6, wherein the reinforcing fibers are reinforcing fibers pre-impregnated with thermosetting resin, and the reinforcing fibers will be cured after being wound on the outer peripheral wall of the resin inner tank, so The thermosetting resin is one or more of epoxy resin, unsaturated polyester resin, polyamide resin and vinyl resin.
A method of manufacturing a gas storage tank as claimed in any one of claims 1 to 7, characterized in that, comprising the steps of:

adding the carbon nanotubes to the thermoplastic resin, and kneading the thermoplastic resin and the carbon nanotubes by applying shear force, so that the carbon nanotubes are uniformly dispersed in the thermoplastic resin;

The kneaded thermoplastic resin and the carbon nanotubes are made into the resin liner, and the reinforcing layer is wound on the outside of the resin liner to obtain the air storage tank.
The method for manufacturing an air tank according to claim 8, wherein a dispersant is further added when the thermoplastic resin and the carbon nanotubes are kneaded by applying a shearing force.
The method for manufacturing an air storage tank according to claim 8, wherein the winding method for winding the reinforcing layer on the outside of the resin inner tank comprises one of hoop winding, helical winding and plane winding.
The method for manufacturing an air storage tank according to claim 8, characterized in that after wrapping the reinforcing layer on the outside of the resin liner, it further comprises the step of: providing energy required for curing, and wrapping the reinforcing layer on the outer side of the resin liner. The resin liner is cured.