Gas cylinder light-heat dual-curing forming system and forming method and gas cylinder

Abstract

The invention discloses a gas cylinder light-heat dual-curing forming system and method and a gas cylinder, and relates to the technical field of gas cylinder forming. The invention discloses a light-heat dual-curing forming system for a gas cylinder. The light-heat dual-curing forming system comprises a yarn fixing unit, an impregnation unit, a light curing unit, a winding unit and a heat curing unit. When the light-heat dual-curing forming system for the gas cylinder is adopted for forming, the problems of glue overflowing, complex process and the like can be solved, and the production efficiency and the production quality are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas cylinder forming, in particular to a gas cylinder photo-thermal dual-curing forming system and method and a gas cylinder. BACKGROUND

[0002] Hydrogen energy is a secondary clean energy, known as the "ultimate energy of the 21st century", and its application scenarios include automobiles, aerospace, ships and other fields, and its development prospects are very broad. The field of hydrogen storage has also developed rapidly. The current hydrogen storage method is mainly gaseous hydrogen storage, among which the most widely used is carbon fiber full-winding hydrogen storage cylinder, which not only has a high hydrogen storage density, but also has relatively high safety.

[0003] There are mainly two production processes for existing hydrogen storage cylinders: wet winding and dry winding. The wet winding is to first immerse continuous carbon fiber or glass fiber in resin, then wind it on the inner container, and finally heat-cure to form; the dry winding is to directly use pre-impregnated tape to wind on the inner container, and then heat-cure to form. The technical route of wet winding is relatively mature, but there are problems such as overflow of glue in the wet winding process, resulting in many deficiencies in the uniformity of the quality of the gas cylinder and the production efficiency; although the dry winding process can make up for the deficiencies of the wet winding process, it has high requirements for equipment and personnel, and the process flow is complex, making it difficult to popularize. SUMMARY

[0004] The main purpose of the present application is to provide a gas cylinder photo-thermal dual-curing forming system and method, and a gas cylinder, to solve the problems of overflow of glue, low production efficiency and complex process in the existing forming process.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a gas cylinder photo-thermal dual-curing forming system is provided, which comprises:

[0006] A yarn fixing unit is used to fix the yarn on the creel to form a to-be-immersed object;

[0007] An immersion unit comprises a to-be-immersed object inlet, a resin inlet and an immersion product outlet, and the to-be-immersed object inlet is connected with the yarn fixing unit; the immersion unit is used to immerse the to-be-immersed object in the resin;

[0008] A photo-curing unit comprises an immersion product inlet and a photo-curing product outlet, and the immersion product inlet is connected with the immersion product outlet of the immersion unit; the photo-curing unit is used to perform photo-curing treatment on the to-be-photo-cured object;

[0009] A winding unit comprises a photo-curing product inlet and a winding product outlet, and the photo-curing product inlet is connected with the photo-curing product outlet of the photo-curing unit; the winding unit is used to wind the photo-curing product on the to-be-wound gas cylinder core mold;

[0010] The thermosetting unit includes a winding product inlet, which is connected to the winding product outlet of the winding unit; the thermosetting unit is used to perform thermosetting treatment on the winding product.

[0011] Furthermore, the photocuring unit includes a photocuring channel and an ultraviolet light source, with the ultraviolet light source positioned along the extension direction of the photocuring channel.

[0012] Furthermore, the ultraviolet light source is arranged on the upper and lower sides of the photocuring channel along the extension direction of the photocuring channel; preferably, the ultraviolet light source is an ultraviolet light planar light source, and its illumination direction is perpendicular to the extension direction of the photocuring channel; more preferably, the vertical distance between the ultraviolet light source and the central axis of the photocuring channel is 1-2 cm.

[0013] According to a second aspect of the present invention, a method for photo-thermal dual-curing molding of gas cylinders is provided. This method employs the photo-thermal dual-curing molding system for gas cylinders according to the first aspect of the present invention, and specifically includes the following steps:

[0014] S1, fix the carbon fiber yarn on the yarn frame to obtain the material to be impregnated;

[0015] S2, add the material to be impregnated into the resin and allow it to fully impregnate to obtain the impregnated product;

[0016] S3, the impregnated product is subjected to photocuring treatment to obtain a photocured product;

[0017] S4, use the light-cured product to wrap the gas cylinder to obtain the wrapped product;

[0018] S5, perform thermosetting treatment on the wound product to complete the molding.

[0019] Furthermore, the tension of the yarn frame is 10-80N.

[0020] Furthermore, the impregnation unit includes an impregnation tank with a gap of 0.05-0.4 mm and an impregnation temperature of 15-50℃.

[0021] Furthermore, the intensity of the ultraviolet light source is 35-55 mW / cm². 2 The temperature of the photocuring unit is 15-25℃.

[0022] Furthermore, the thermosetting process employs a stepped heating method: the first stage involves heating from room temperature to 65-75℃ and holding for 1-2 hours; the second stage involves heating from 65-75℃ to 85-95℃ and holding for 1-2 hours; the third stage involves heating from 85-95℃ to 105-115℃ and holding for 4-7 hours; and finally, the temperature is lowered to room temperature.

[0023] Further, the resin in step S2 comprises the following components in parts by weight: 40-110 parts of photosensitive epoxy resin, 5-40 parts of allyl epoxy resin, 0.1-10 parts of onium salt, 5-40 parts of mercapto compound, and 10-80 parts of organic acid anhydride.

[0024] Further, the resin comprises the following components in parts by weight: 60-80 parts of photosensitive epoxy resin, 15-30 parts of allyl epoxy resin, 1.5-5 parts of onium salt, 15-30 parts of mercapto compound, and 30-40 parts of organic acid anhydride.

[0025] Furthermore, the photosensitive epoxy resin is at least one of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, bis((3,4-epoxycyclohexyl)methyl)adipate, diisoprene diepoxide, and dicyclopentadiene diepoxide.

[0026] Furthermore, the allyl epoxy resin is at least one of diallyl bisphenol A type epoxy resin, diallyl bisphenol F type epoxy resin, and diallyl bisphenol S type epoxy resin.

[0027] Furthermore, the onium salt is a fluorinated onium salt. The fluorinated onium salt is at least one of triarylhexafluoroantimony sulfonium salt, triarylhexafluorophosphate sulfonium salt, bis(4-dodecylphenyl)hexafluoroantimony iodonium salt, and bis(4-isobutylphenyl)hexafluorophosphate iodonium salt.

[0028] Further, the thiol compound is at least one of bis(3-mercaptopropionic acid) glycol, trimethylolpropane tris(3-mercaptopropionate), 2,2-bis[3-(3-mercaptopropyl)-4-(3-mercaptopropoxy)phenyl]propane, and bis[3-(3-mercaptopropyl)-4-(3-mercaptopropoxy)phenyl]methane.

[0029] Furthermore, the organic acid anhydride is at least one of methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, and methylnadic anhydride.

[0030] Furthermore, the preparation method of the resin in S2 includes the following steps:

[0031] (1) Add photosensitive epoxy resin and organic acid anhydride into a mixing vessel according to the ratio and premix to obtain the first mixture;

[0032] (2) Allyl epoxy resin, onium salt and mercapto compound are added to a mixing vessel according to the formula and premixed to obtain a second mixture;

[0033] (3) The first mixture and the second mixture are mixed to obtain the resin.

[0034] According to a third aspect of the present invention, a gas cylinder is provided that is manufactured by the above-described gas cylinder photo-thermal dual curing molding method.

[0035] The gas cylinder photo-thermal dual curing molding system provided by this invention includes a yarn fixing unit, an impregnation unit, a photocuring unit, a winding unit, and a thermal curing unit. This system can cure the impregnated product to a certain extent, preventing glue overflow during the winding process, which is beneficial to improving the quality of the gas cylinder and production efficiency. In addition, this system only adds a photocuring unit to the wet winding system, which has little impact on the process flow and is relatively simple. Attached Figure Description

[0036] Figure 1 This is a structural block diagram of the gas cylinder photo-thermal dual-curing molding system in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of the photocuring unit in an embodiment of the present invention;

[0038] The above figures include the following reference numerals:

[0039] 10. Yarn fixing unit; 20. Impregnation unit; 30. UV curing unit; 40. Winding unit; 50. Heat curing unit; 31. Impregnation product inlet; 32. UV curing product outlet; 33. Ultraviolet light source; 34. UV curing channel. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0041] As described in the background section of this invention, existing gas cylinder molding methods suffer from glue overflow problems, which degrade molding quality and affect production efficiency. To address these technical problems, in a typical embodiment of this invention, a gas cylinder photo-thermal dual-curing molding system is provided, the structural block diagram of which is shown below. Figure 1 As shown, the molding system includes:

[0042] The yarn fixing unit 10 is used to fix the yarn on the yarn frame to form the material to be impregnated;

[0043] Impregnation unit 20 includes a material inlet, a resin inlet, and an impregnation product outlet. The material inlet is connected to the yarn fixing unit 10. Impregnation unit 20 is used to impregnate the material in the resin.

[0044] The photocuring unit 30 includes an impregnation product inlet and a photocurable product outlet, the impregnation product inlet being connected to the impregnation product outlet of the impregnation unit 20; the photocuring unit 30 is used to perform photocuring treatment on the material to be photocured.

[0045] The winding unit 40 includes a UV-curable product inlet and a winding product outlet. The UV-curable product inlet is connected to the UV-curable product outlet of the UV-curable unit 30. The winding unit 40 is used to wind the UV-curable product onto the gas cylinder core mold to be wound.

[0046] The thermosetting unit 50 includes a winding product inlet, which is connected to the winding product outlet of the winding unit 40; the thermosetting unit 50 is used to perform thermosetting treatment on the winding product.

[0047] The photo-thermal dual-curing molding system for gas cylinders provided by this invention enables photosensitive pre-curing of impregnated carbon fibers, preventing adhesive overflow during winding and improving the uniformity of gas cylinder quality. Finally, thermal curing in the thermal curing unit further enhances the mechanical properties of the gas cylinder. The molding system provided by this invention has a simple structure, requires no complex equipment, and has low personnel requirements, making it suitable for widespread industrial application.

[0048] In a preferred embodiment of the present invention, the photocuring unit 30 includes a photocuring channel and an ultraviolet light source, wherein the ultraviolet light source is arranged along the extension direction of the photocuring channel, as shown in the schematic diagram below. Figure 2 As shown.

[0049] In a preferred embodiment of the present invention, the ultraviolet light source is disposed on the upper and lower sides of the photocuring channel along the extension direction of the channel; preferably, the ultraviolet light source is a planar ultraviolet light source, and its illumination direction is perpendicular to the extension direction of the photocuring channel; more preferably, the vertical distance between the ultraviolet light source and the central axis of the photocuring channel is 1-2 cm. The photocuring unit 30 described above has a high efficiency in pre-curing the impregnated product, which helps to further improve production efficiency.

[0050] In another typical embodiment of the present invention, a method for photo-thermal dual-curing molding of gas cylinders is provided. This method uses the photo-thermal dual-curing molding system for gas cylinders described in the above embodiment for molding, and specifically includes the following steps:

[0051] S1, fix the carbon fiber yarn on the yarn frame to obtain the material to be impregnated;

[0052] S2, add the material to be impregnated into the resin and allow it to fully impregnate to obtain the impregnated product;

[0053] S3, the impregnated product is subjected to photocuring treatment to obtain a photocured product;

[0054] S4, use the light-cured product to wrap the gas cylinder to obtain the wrapped product;

[0055] S5, perform thermosetting treatment on the wound product to complete the molding.

[0056] The above molding method is simple and can be completed with only simple equipment. It has high production efficiency and produces gas cylinders with high mechanical properties, making it suitable for industrial production.

[0057] In a preferred embodiment of the present invention, the tension of the yarn frame is 10-80N. Controlling the tension of the yarn frame is to make the gas cylinder have high strength and good shape stability.

[0058] In a preferred embodiment of the present invention, the impregnation unit 20 further includes an impregnation tank with a gap of 0.05-0.4 mm and an impregnation temperature of 15-50°C.

[0059] The material to be impregnated is immersed in the impregnation tank. The gap of the impregnation tank has a certain influence on the penetration effect and glue content of the material to be impregnated. If the gap of the impregnation tank is within the above range, the yarn can have a moderate glue content, which can achieve light curing quickly and have a good adhesion effect and high adhesion to the gas cylinder.

[0060] In a preferred embodiment of the present invention, the intensity of the ultraviolet light source is 35-55 mW / cm². 2 The temperature of the photocuring unit is 15-25℃.

[0061] The above-mentioned optimization of the intensity of the ultraviolet light source and the temperature of the photocuring unit 30 can make the photocuring speed of the impregnated product fast and suitable for winding processing.

[0062] In a preferred embodiment of the present invention, the length of the photocuring channel is 4m. Within the photocuring channel of this length, the impregnated product can be pre-cured, thereby shaping the impregnated carbon fiber yarn.

[0063] In a preferred embodiment of the present invention, the winding speed is 5-40 m / min. Winding under the above conditions helps to improve production efficiency and achieves better winding results.

[0064] In a preferred embodiment of the present invention, the thermosetting treatment adopts a stepped heating method: the first stage is to heat from room temperature to 65-75°C and hold for 1-2 hours; the second stage is to heat from 65-75°C to 85-95°C and hold for 1-2 hours; the third stage is to heat from 85-95°C to 105-115°C and hold for 4-7 hours; and finally, the temperature is lowered to room temperature.

[0065] Using a stepped heating method can improve the curing effect and help improve the mechanical properties of the gas cylinder.

[0066] In a preferred embodiment of the present invention, the resin in step S2 comprises the following components in parts by weight: 40-110 parts of photosensitive epoxy resin, 5-40 parts of allyl epoxy resin, 0.1-10 parts of onium salt, 5-40 parts of mercapto compound, and 10-80 parts of organic acid anhydride.

[0067] This invention employs the reaction mechanisms of cationic photocuring and click chemistry, simultaneously introducing a dark reaction photocuring system and a mercapto-alkene click chemistry system into the resin system. Using the above formulation, the resin can be rapidly pre-cured under ultraviolet light irradiation, which can adapt to the fast winding speed of hydrogen storage cylinders and improve production efficiency. After winding, thermocuring can further improve the crosslinking density and degree of curing of the resin, giving the resin excellent mechanical properties.

[0068] In a preferred embodiment of the present invention, the resin comprises the following components in parts by weight: 60-80 parts of photosensitive epoxy resin, 15-30 parts of allyl epoxy resin, 1.5-5 parts of onium salt, 15-30 parts of mercapto compound, and 30-40 parts of organic acid anhydride.

[0069] By further optimizing the resin composition to achieve a suitable viscosity at room temperature, carbon fiber yarn can be completely impregnated without any dry or fuzzy yarn, and pre-curing can be completed within 3-20 seconds, resulting in high production efficiency.

[0070] In a preferred embodiment of the present invention, the photosensitive epoxy resin is at least one selected from 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, bis((3,4-epoxycyclohexyl)methyl)adipate, diisoprene diepoxide, and dicyclopentadiene diepoxide. The above-mentioned photosensitive epoxy resin exhibits good photosensitivity and can be rapidly cured under ultraviolet light.

[0071] In a preferred embodiment of the present invention, the allyl epoxy resin is at least one of diallyl bisphenol A type epoxy resin, diallyl bisphenol F type epoxy resin, and diallyl bisphenol S type epoxy resin.

[0072] In a preferred embodiment of the present invention, the onium salt is a fluorinated onium salt. The fluorinated onium salt is at least one selected from triarylhexafluoroantimony sulfonium salt, triarylhexafluorophosphate sulfonium salt, bis(4-dodecylphenyl)hexafluoroantimony iodonium salt, and bis(4-isobutylphenyl)hexafluorophosphate iodonium salt. Onium salts are cationic photoinitiators, and the aforementioned onium salts exhibit excellent photoinitiation properties, generating a superprotic acid under ultraviolet light irradiation to initiate the polymerization reaction of epoxy resins.

[0073] In a preferred embodiment of the present invention, the thiol compound is at least one of bis(3-mercaptopropionic acid) ethylene glycol, trimethylolpropane tris(3-mercaptopropionate), 2,2-bis[3-(3-mercaptopropyl)-4-(3-mercaptopropoxy)phenyl]propane, and bis[3-(3-mercaptopropyl)-4-(3-mercaptopropoxy)phenyl]methane.

[0074] In a preferred embodiment of the present invention, the organic acid anhydride is at least one selected from methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, and methylnadic anhydride. The aforementioned organic acid anhydride is a liquid organic acid anhydride, which provides better mixing with epoxy resin and is beneficial for improving the curing speed, making the photocured product suitable for winding processing.

[0075] In a preferred embodiment of the present invention, a method for preparing the resin is also provided, comprising the following steps:

[0076] (1) Add photosensitive epoxy resin and organic acid anhydride into a mixing vessel according to the ratio and premix to obtain the first mixture;

[0077] (2) Allyl epoxy resin, onium salt and mercapto compound are added to a mixing vessel according to the formula and premixed to obtain a second mixture;

[0078] (3) The first mixture and the second mixture are mixed to obtain the resin.

[0079] In another typical embodiment of the present invention, a gas cylinder is provided that is manufactured by the molding method described in the above embodiments.

[0080] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0081] Example 1

[0082] One embodiment of the photo-thermal dual-curing molding method for gas cylinders of the present invention, wherein the molding method described in this embodiment adopts... Figure 1 The molding system and molding method shown herein specifically include the following steps:

[0083] S1, install the carbon fiber yarn on the yarn frame, with the tension preset to 20N, to obtain the carbon fiber yarn to be impregnated;

[0084] S2, add resin to a light-proof impregnation tank with a gap of 0.2 mm, place the material to be impregnated in the impregnation tank, the impregnation temperature is 30℃, remove after impregnation, and obtain the impregnated product;

[0085] S3, the impregnation product is introduced into the photocuring channel of the photocuring unit, and the vertical distance between the ultraviolet light source and the central axis of the photocuring channel is 1 cm; the temperature of the photocuring unit is 25℃, and the light source intensity is 50mW / cm².2 After pre-curing is completed, a photocured product is obtained;

[0086] S4, the photocured product impregnated carbon fiber yarn is wound onto the mandrel of the gas cylinder at a winding speed of 30m / min to obtain the wound product;

[0087] S5. The wound product is transferred to a curing oven for heat curing. The heat curing program is preset to heat up from room temperature to 70°C, hold for 2 hours, then heat up to 90°C, hold for 2 hours, then heat up to 110°C, hold for 4 hours, and finally cool naturally to room temperature to obtain a gas cylinder with light-heat dual curing.

[0088] The composition of the resin is shown in Table 1, and the preparation method is as follows:

[0089] (1) Photosensitive epoxy resin 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylic acid and organic acid anhydride methylhexahydrophthalic anhydride were added to a mixing vessel for premixing to obtain the first mixture; the mixing speed was 1000 rpm, the mixing temperature was 25℃, and the mixing time was 1 h.

[0090] (2) Allyl epoxy resin, diallyl bisphenol A type epoxy resin, onium salt bis(4-dodecylphenyl)hexafluoroantimony iodonium salt, and mercapto compound bis(3-mercaptopropionic acid) ethylene glycol were added to a light-proof mixing vessel and dispersed by high-speed shearing to obtain a second mixture; the dispersion speed was 800 rpm, the temperature was 25℃, and the time was 1 h;

[0091] (3) The first mixture and the second mixture are mixed and sheared and dispersed under light-protected conditions to finally obtain the resin; the shearing speed is 1000 rpm, the temperature is 25℃, and the mixing time is 1 h.

[0092] Examples 2-5

[0093] Examples 2-5 are embodiments of the photo-thermal dual-curing molding method for gas cylinders of the present invention. The only difference between them and Example 1 is that the amounts of different components in the resin are different, as shown in Table 1.

[0094] Table 1 (parts by weight)

[0095] Item Example 1 Example 2 Example 3 Example 4 Example 5 Photosensitive epoxy resin 60 70 80 40 110 Organic acid anhydride 40 35 30 10 80 Onium salt 4.6 1.5 5 0.1 10 Allyl epoxy resin 23 30 15 5 40 Mercapto compound 23 30 15 5 40

[0096] Examples 6-8

[0097] Examples 6-8 are embodiments of the photo-thermal dual-curing molding method for gas cylinders of the present invention. The difference between them and Example 1 is that some or all of the components in the photosensitive epoxy resin, organic acid anhydride, onium salt, allyl epoxy resin, and mercapto compound are different.

[0098] In Example 6, the photosensitive epoxy resin is dicyclopentadiene epoxy resin, the organic acid anhydride is methyl hexahydrophthalic anhydride, the onium salt is triarylhexafluoroantimony sulfonium salt, the allyl epoxy resin is diallyl bisphenol A type epoxy resin, and the mercapto compound is bis[3-(3-mercaptopropyl)-4-(3-mercaptopropoxy)phenyl]methane.

[0099] In Example 7, the photosensitive epoxy resin is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, the organic acid anhydride is methylnadic anhydride, the onium salt is triarylhexafluorophosphate sulfonium salt, the allyl epoxy resin is diallyl bisphenol A type epoxy resin, and the mercapto compound is bis(3-mercaptopropionic acid) ethylene glycol.

[0100] In Example 8, the photosensitive epoxy resin is dicyclopentadiene epoxide, the organic acid anhydride is methyl hexahydrophthalic anhydride, the onium salt is bis(4-isobutylphenyl)hexafluorophosphate iodonium salt, the allyl epoxy resin is diallyl bisphenol A type epoxy resin, and the mercapto compound is bis[3-(3-mercaptopropyl)-4-(3-mercaptopropoxy)phenyl]methane.

[0101] Example 9

[0102] This embodiment of the gas cylinder photo-thermal dual-curing molding method of the present invention uses the same resin as in Embodiment 1, the only difference being the molding conditions. The specific photo-thermal dual-curing molding method for gas cylinders in this embodiment is as follows:

[0103] S1, Install the carbon fiber yarn on the yarn frame, with the tension preset to 50N, to obtain the material to be impregnated;

[0104] S2, add resin to a light-proof impregnation tank at 35℃ with a gap of 0.2mm, place the material to be impregnated in the impregnation tank, and remove it after it is fully impregnated to obtain the impregnated product;

[0105] S3, the impregnation product is introduced into the curing channel of the curing unit, with a center distance of 1 cm between the ultraviolet light source and the curing channel; the temperature of the curing unit is 25℃, and the light source intensity is 35mW / cm². 2 After pre-curing is completed, a photocured product is obtained;

[0106] S4, the photocured product impregnated carbon fiber yarn is wound onto the mandrel of the gas cylinder at a winding speed of 30m / min to obtain the wound product;

[0107] S5. The wound product is transferred to a curing oven for heat curing. The heat curing program is preset to heat up from room temperature to 75°C and hold for 1 hour, then heat up to 90°C and hold for 1 hour, then heat up to 110°C and hold for 6 hours, and finally cool down to 30°C and hold for 1 hour, and then cool naturally to obtain a gas cylinder with light-heat dual curing.

[0108] Example 10

[0109] This embodiment of the gas cylinder photo-thermal dual-curing molding method of the present invention uses the same resin as in Embodiment 1, the only difference being the molding conditions. The specific photo-thermal dual-curing molding method for gas cylinders in this embodiment is as follows:

[0110] S1, Install the carbon fiber yarn on the yarn frame, with the tension preset to 80N, to obtain the material to be impregnated;

[0111] S2, add resin to a light-proof impregnation tank at 50℃ with a gap of 0.2mm, place the material to be impregnated in the impregnation tank, and remove it after it is fully impregnated to obtain the impregnated product;

[0112] S3, the impregnation product is introduced into the curing channel of the curing unit, with a center distance of 2 cm between the ultraviolet light source and the curing channel; the temperature of the curing unit is 25℃, and the light source intensity is 45mW / cm². 2 After pre-curing is completed, a photocured product is obtained;

[0113] S4. The photocured product is wound onto the mandrel of the gas cylinder at a winding speed of 30 m / min to obtain the wound product.

[0114] S5. The wound product is transferred to a curing oven for heat curing. The heat curing program is preset to heat up from room temperature to 65°C and hold for 2 hours, then heat up to 90°C and hold for 1 hour, then heat up to 110°C and hold for 7 hours, and finally cool down to 30°C and hold for 1 hour, and then cool naturally to obtain a gas cylinder with light-heat dual curing.

[0115] Performance testing

[0116] 1) Impregnation time: Immerse the carbon fiber in the resin solution, remove it every 1 second, and manually tear it to observe whether the fiber is fully impregnated with resin. The time it takes for the resin to completely impregnate the carbon fiber is called the impregnation time.

[0117] 2) Curing time: Place the resin at 35-55mW / cm². 2 Under ultraviolet light, the time it takes for the resin to change from a liquid state to a gel state is called the photocuring time.

[0118] 3) Mechanical properties of composite material layers in gas cylinders: Refer to standard GB / T 1458-2008.

[0119] Table 2 Test Data

[0120]

[0121] The test results above show that when using the gas cylinder photo-thermal dual curing molding system of the present invention to produce gas cylinders, the impregnation time and photocuring time of carbon fiber yarn are relatively short, both of which can be controlled within 10 seconds. No glue overflow occurs during the processing, and the production efficiency and production quality are both high. In addition, the strength of the gas cylinders produced is high, all of which can reach 2400MPa, and they have good application prospects.

[0122] Furthermore, comparing the performance test results of Examples 1-5, it can be seen that when the composition of the impregnating resin meets the following conditions: 60-80 parts of photosensitive epoxy resin, 15-30 parts of allyl epoxy resin, 1.5-5 parts of onium salt, 15-30 parts of mercapto compound, and 30-40 parts of organic acid anhydride, the impregnation time can be controlled within 5 seconds, the photocuring time can be controlled within 6 seconds, and the tensile strength can reach more than 2500 MPa. It has both good processing performance and high product quality.

[0123] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gas cylinder photo-thermal dual-curing molding system, characterized in that, The gas cylinder photo-thermal dual-curing molding system includes: Yarn fixing unit (10) is used to fix the yarn on the yarn frame to form the material to be impregnated; The impregnation unit (20) includes an impregnation material inlet, a resin inlet, and an impregnation product outlet. The impregnation material inlet is connected to the yarn fixing unit (10). The impregnation unit (20) is used to impregnate the impregnation material in the resin. The photocuring unit (30) includes an impregnation product inlet and a photocurable product outlet, wherein the impregnation product inlet is connected to the impregnation product outlet of the impregnation unit (20); the photocuring unit (30) is used to perform photocuring treatment on the object to be photocured. The winding unit (40) includes a photocurable product inlet and a winding product outlet, wherein the photocurable product inlet is connected to the photocurable product outlet of the photocurable unit (30); the winding unit (40) is used to wind the photocurable product onto the cylinder core mold to be wound. The thermosetting unit (50) includes a winding product inlet connected to the winding product outlet of the winding unit (40); the thermosetting unit (50) is used to perform thermosetting treatment on the winding product.

2. The gas cylinder photo-thermal dual-curing molding system according to claim 1, characterized in that, The photocuring unit (30) includes a photocuring channel and an ultraviolet light source, wherein the ultraviolet light source is arranged along the extension direction of the photocuring channel.

3. The gas cylinder photo-thermal dual-curing molding system according to claim 2, characterized in that, The ultraviolet light source is disposed on the upper and lower sides of the photocuring channel along the extension direction of the channel; preferably, the ultraviolet light source is a planar ultraviolet light source, and its illumination direction is perpendicular to the extension direction of the photocuring channel; more preferably, the vertical distance between the ultraviolet light source and the central axis of the photocuring channel is 1-2 cm.

4. A method for photo-thermal dual-curing molding of gas cylinders, characterized in that, The gas cylinder photo-thermal dual-curing molding system according to any one of claims 2 to 3 is used for molding, and the gas cylinder photo-thermal dual-curing molding method includes the following steps: S1, fix the carbon fiber yarn on the yarn frame to obtain the material to be impregnated; S2, the material to be impregnated is added to the resin and impregnated to obtain the impregnated product; S3, the impregnation product is subjected to photocuring treatment to obtain a photocured product; S4, use the photocurable product to wrap the gas cylinder to obtain the wrapped product; S5, the winding product is subjected to thermosetting treatment, and the molding is completed.

5. The gas cylinder photo-thermal dual-curing molding method according to claim 4, characterized in that, The tension of the yarn frame is 10-80N; and / or The impregnation unit (20) further includes an impregnation tank with a gap of 0.05-0.4 mm, and the impregnation process is carried out at a temperature of 15-50°C; and / or The intensity of the ultraviolet light source is 35-55 mW / cm². 2 The temperature of the photocuring unit (30) is 15-25°C; and / or The thermosetting process employs a stepped heating method: the first stage involves heating from room temperature to 65-75℃ and holding for 1-2 hours; the second stage involves heating from 65-75℃ to 85-95℃ and holding for 1-2 hours; the third stage involves heating from 85-95℃ to 105-115℃ and holding for 4-7 hours; and finally, cooling back to room temperature.

6. The gas cylinder photo-thermal dual-curing molding method according to claim 4 or 5, characterized in that, The resin comprises the following components in parts by weight: 40-110 parts of photosensitive epoxy resin, 5-40 parts of allyl epoxy resin, 0.1-10 parts of onium salt, 5-40 parts of mercapto compound, and 10-80 parts of organic acid anhydride.

7. The gas cylinder photo-thermal dual-curing molding method according to claim 6, characterized in that, The resin comprises the following components in parts by weight: 60-80 parts of photosensitive epoxy resin, 15-30 parts of allyl epoxy resin, 1.5-5 parts of onium salt, 15-30 parts of mercapto compound, and 30-40 parts of organic acid anhydride.

8. The gas cylinder photo-thermal dual-curing molding method according to claim 6, characterized in that, The photosensitive epoxy resin is at least one selected from 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, bis((3,4-epoxycyclohexyl)methyl)adipate, diisoprene diester, and dicyclopentadiene diester; and / or The allyl epoxy resin is at least one of diallyl bisphenol A type epoxy resin, diallyl bisphenol F type epoxy resin, and diallyl bisphenol S type epoxy resin; and / or The onium salt is a fluorinated onium salt; preferably, the fluorinated onium salt is at least one selected from triarylhexafluoroantimony sulfonium salt, triarylhexafluorophosphate sulfonium salt, bis(4-dodecylphenyl)hexafluoroantimony iodonium salt, and bis(4-isobutylphenyl)hexafluorophosphate iodonium salt; and / or The thiol compound is at least one of bis(3-mercaptopropionic acid) glycol, trimethylolpropane tris(3-mercaptopropionate), 2,2-bis[3-(3-mercaptopropyl)-4-(3-mercaptopropoxy)phenyl]propane, and bis[3-(3-mercaptopropyl)-4-(3-mercaptopropoxy)phenyl]methane; and / or The organic acid anhydride is at least one of methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, and methylnadic anhydride.

9. The gas cylinder photo-thermal dual-curing molding method according to claim 8, characterized in that, The method for preparing the resin includes the following steps: (1) The photosensitive epoxy resin and the organic acid anhydride are added to a mixing vessel according to the proportion and premixed to obtain a first mixture; (2) The allyl epoxy resin, the onium salt, and the mercapto compound are added to a mixing vessel according to the specified ratio and premixed to obtain a second mixture; (3) The first mixture and the second mixture are mixed to obtain the resin.

10. A gas cylinder, characterized in that, It is prepared by the photo-thermal dual curing molding method for gas cylinders as described in any one of claims 4 to 9.

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