Thermoplastic bistable tube and preparation method thereof

Abstract

The invention provides a thermoplastic bistable tube and a preparation method thereof, and belongs to the technical field of high polymer materials. The preparation method of the thermoplastic bistable tube comprises the following steps: mixing PMMA (polymethyl methacrylate) and MMA (methyl methacrylate) monomers to obtain a binary resin solution, and adding an oxidizing agent and a reducing agent into the binary resin solution for secondary mixing to obtain a solution for filling; and compounding the solution for perfusion and the continuous fibers through a vacuum or high-pressure flow guide forming method, and then curing to obtain the thermoplastic bistable-state tube. The PMMA / MMA binary resin mixed solution is adopted, implosion cannot occur, the performance of the composite material cannot be damaged, electric energy does not need to be consumed for heating, the design cost and the machining cost of the composite material mold are reduced, and double cost saving and efficiency increasing are achieved.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a thermoplastic bistable tube and its preparation method. Background Technology

[0002] A bistable structure is a system capable of switching between two or more stable states. This structure is typically achieved through specific design and manufacturing processes, allowing it to exhibit different shapes or functions under varying stress conditions. A typical application of bistable structures is foldable structures, such as folding chairs and folding vehicle frames. However, in high-performance composite materials, bistable characteristics are primarily achieved through the following methods: Geometric design: Specific geometric design ensures the structure has stable minimum energy values ​​in different states; Material selection: Utilizing materials with high elastic modulus and high strength ensures the structure does not undergo permanent deformation during the switching process; Manufacturing processes: Employing advanced molding technologies, such as vacuum injection molding and pultrusion, to precisely control the microstructure and macroscopic properties of the material.

[0003] Existing bistable structures typically rely on complex manufacturing processes or expensive materials, limiting their widespread application. Especially for applications requiring stable morphology under varying environments and rapid state switching, current technologies often fall short. Therefore, developing a simple and cost-effective fabrication method for thermoplastic bistable cylindrical shell structures is of great significance. Thermoplastic bistable composites are a class of advanced materials capable of switching between two stable states. Due to their unique bistable properties—maintaining a stable morphology under different conditions and rapidly switching between them under external forces—these materials are widely used in aerospace, automotive, smart structures, medical devices, and many other fields. This section will detail the relevant technologies of thermoplastic bistable composites.

[0004] Chinese invention patent application CNA114033233A discloses a portable, self-extending lightweight mast structure. Both the mast body and the support rods of the support mechanism are made of bistable composite material structures. This structure boasts advantages such as small size, light weight, high strength, high erection height, and rapid deployment. It can be carried by a single person and is particularly suitable for use in conditions inaccessible by vehicles, providing strong support for the rapid establishment of emergency networks. Chinese invention patent application CN110165362A discloses a portable composite shortwave whip antenna device. It introduces a bistable composite material tube as the support structure for the whip antenna, with copper wire pre-embedded in the composite material tube. During transportation, the copper wire and the bistable composite material tube are rolled up together for stable storage, requiring no additional structural constraints, reducing the weight of the whip antenna device and decreasing its volume during transport. However, the aforementioned bistable structures often rely on complex geometric designs or expensive materials, resulting in high costs and unstable performance. Furthermore, MMA monomers are volatile, leading to high VOC emissions during high-temperature processing.

[0005] Therefore, it is very important to provide a thermoplastic bistable tube that reduces VOC emissions and can maintain a stable shape under different environments. Summary of the Invention

[0006] The purpose of this invention is to provide a thermoplastic bistable tube and its preparation method, in order to solve the technical problems of existing bistable tubes that rely on complex geometric design or expensive materials, resulting in high costs, easy volatilization of MMA monomers, high VOC emissions during high-temperature processes, and inability to maintain a stable morphology under different environments.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a method for preparing a thermoplastic bistable tube, comprising the following steps: 1) Mix PMMA and MMA monomers to obtain a binary resin solution. Add oxidant and reducing agent to the binary resin solution for a second mixing to obtain a solution for infusion. 2) The injection solution and continuous fibers are combined by vacuum or high-pressure flow molding method, and then cured to obtain a thermoplastic bistable tube.

[0008] Furthermore, the amount of PMMA added is 2-20% of the mass of the MMA monomer; The amount of oxidant added is 0.2-3% of the mass of MMA monomer; The amount of reducing agent added is 0 to 1% of the mass of MMA monomer.

[0009] Furthermore, the MMA monomer includes one or more of acrylic acid, methacrylic acid, methyl methacrylate, butyl methacrylate, acrylamide, and methacrylamide; The continuous fibers include glass fibers, carbon fibers, mineral-derived fibers, or plant-derived fibers.

[0010] Furthermore, the oxidizing agent includes tert-butyl peroxynedecanoate, benzoyl peroxide, dibutyl peroxydicarbonate, tert-butyl peroxy(2-ethylhexanoate), tert-butyl peroxyacetate, tetramethylbutyl peroxynedecanoate, dodecyl peroxide, bis(4-butylcyclohexyl) peroxydicarbonate, di(2-ethylhexyl) peroxydicarbonate, butyl peroxynedecanoate, dipropyl peroxydicarbonate, diisopropyl peroxydicarbonate, diethoxyethyl peroxydicarbonate, diethoxyhexyl peroxydicarbonate, hexyl peroxydicarbonate, methyl ethyl ketone peroxide, cyclohexanone peroxide, dimethoxybutyl peroxydicarbonate, and bis(3-methoxy-3-methoxybutyl) peroxydicarbonate. Dicarbonate, dibutyl peroxydicarbonate, di(hexadecyl)dicarbonate peroxide, ditetradecyl peroxydicarbonate, cumene hydroperoxide, tert-butyl peroxybenzoate, 1,1,3,3-tetramethylbutyl peroxypentanoate, hexyl peroxypentanoate, butyl peroxypentanoate, trimethylhexanoyl peroxide, dimethylhydroxybutyl peroxydecanoate, pentyl peroxydecanoate, tert-butyl peroxyheptanoate, pentyl peroxypentanoate, tert-butyl peroxypentanoate, tert-pentyl peroxy(2-ethyl)hexanoate, lauroyl peroxide, dilauroyl peroxide, didecyl peroxide, peracetic acid, and potassium persulfate, one or more of these.

[0011] Furthermore, the reducing agent includes one or more of N,N'-dimethylaniline, N,N'-dimethyl-p-methylaniline, N,N'-di(2-hydroxypropyl)-p-toluidine, N-methyl-N-2-hydroxyethyl-p-toluidine, N-methyl-N-(2-methacryloyloxyethyl)aniline, and N-methyl-N-(2-methacryloyloxyethyl)-p-toluidine.

[0012] Furthermore, in step 1), the temperature of the second mixing is 10~80℃; The viscosity of the binary resin solution is 20~400 mPa·s.

[0013] Furthermore, the volume fraction of continuous fibers in the thermoplastic bistable tube is 50-80%.

[0014] Furthermore, the composite temperature is 20~100℃, and the composite time is 1~48h; The curing temperature is 60~120℃, and the curing time is 1~48h.

[0015] The present invention also provides a thermoplastic bistable tube prepared by the aforementioned preparation method.

[0016] The beneficial effects of this invention are: 1) The preparation method of the present invention uses a PMMA / MMA binary resin mixed solution. The binary resin does not react easily at room temperature, so it is easy to store and transport, and the shelf life of the raw materials can be extended. Therefore, there will be no burst polymerization that would damage the performance of the composite material, and no need to consume electricity for heating. This simplifies the design and processing costs of the composite mold, achieving double the cost savings and efficiency. Compared with high temperature, room temperature operation can reduce the volatilization of MMA monomers and reduce VOC (volatile organic compound) emissions, making it more environmentally friendly.

[0017] 2) Compared with conventional techniques that increase viscosity by adding polymers, this invention does not require the addition of polymers. A viscosity suitable for vacuum infusion, i.e., 20~400 mPa·s, can be obtained by controlling the prepolymerization of a single monomer. The final product is a PMMA composite material. The composite material of this invention is used to prepare composite test strips according to ISO international standards. The tensile strength of the obtained material in the 0° direction is 1232.5 MPa and the flexural strength is 1201.0 MPa.

[0018] 3) The thermoplastic bistable tubes prepared by this invention can continue to use the processes and equipment commonly used for liquid epoxy thermosetting resins, and have a high acceptance rate among enterprises and the market. The matrix uses thermoplastic materials, which can be recycled through melting, solvent methods, etc., and have good environmental protection effects. Attached Figure Description

[0019] Figure 1 A rolled-up image of the thermoplastic bistable tube prepared in Example 1 of the present invention; Figure 2 This is a development diagram of the thermoplastic bistable tube prepared in Example 1 of the present invention. Detailed Implementation

[0020] This invention provides a method for preparing a thermoplastic bistable tube, comprising the following steps: 1) Mix PMMA and MMA monomers to obtain a binary resin solution. Add oxidant and reducing agent to the binary resin solution for a second mixing to obtain a solution for infusion. 2) The injection solution and continuous fibers are combined by vacuum or high-pressure flow molding method, and then cured to obtain a thermoplastic bistable tube.

[0021] In this invention, the amount of PMMA added is 2-20% of the mass of the MMA monomer, preferably 5-18%, and more preferably 10-15%. The amount of oxidant added is 0.2-3% of the mass of MMA monomer, preferably 0.5-2.5%, and more preferably 1-2%. The amount of reducing agent added is 0 to 1% of the mass of MMA monomer, preferably 0.2 to 0.8%, and more preferably 0.4 to 0.6%.

[0022] In this invention, the MMA monomer includes one or more of acrylic acid, methacrylic acid, methyl methacrylate, butyl methacrylate, acrylamide, and methacrylamide, preferably one or more of methacrylic acid, methyl methacrylate, butyl methacrylate, acrylamide, and methacrylamide, and more preferably one or more of methacrylic acid, methyl methacrylate, butyl methacrylate, and methacrylamide. The continuous fiber includes glass fiber, carbon fiber, mineral-derived fiber or plant-derived fiber, preferably glass fiber, mineral-derived fiber or plant-derived fiber, and more preferably glass fiber or plant-derived fiber.

[0023] In this invention, the oxidizing agent includes tert-butyl peroxynedecanoate, benzoyl peroxide, dibutyl peroxydicarbonate, tert-butyl peroxy(2-ethylhexanoate), tert-butyl peroxyacetate, tetramethylbutyl peroxynedecanoate, dodecyl peroxide, bis(4-butylcyclohexyl) peroxydicarbonate, di(2-ethylhexyl) peroxydicarbonate, butyl peroxynedecanoate, dipropyl peroxydicarbonate, diisopropyl peroxydicarbonate, diethoxyethyl peroxydicarbonate, diethoxyhexyl peroxydicarbonate, and hexyl peroxydicarbonate. Methyl ethyl ketone, cyclohexanone peroxide, dimethoxybutyl peroxide dicarbonate, bis(3-methoxy-3-methoxybutyl) peroxide dicarbonate, dibutyl peroxide dicarbonate, di(hexadecyl) peroxide dicarbonate, ditetradecyl peroxide dicarbonate, cumene hydroperoxide, tert-butyl peroxide, 1,1,3,3-tetramethylbutyl peroxyneopentate, hexyl peroxyneopentate, butyl peroxyneopentate, trimethylhexanoyl peroxide, dimethyl hydroxybutyl peroxyneopentate, pentyl peroxyneopentate, butyl peroxyneopentate One or more of the following: tert-butyl peroxyneoheptanoate, pentyl peroxyneoplastate, tert-butyl peroxyneoplastate, tert-pentyl peroxy(2-ethylhexanoate), lauroyl peroxide, dilauryl peroxide, didecyl peroxide, peracetic acid, and potassium persulfate; preferably, tert-butyl peroxyneodecanate, benzoyl peroxide, dibutyl peroxydicarbonate, tert-butyl peroxy(2-ethylhexanoate), tert-butyl peroxyacetic acid, tetramethylbutyl peroxyneodecanate, dodecyl peroxide, bis(4-butylcyclohexyl)peroxydicarbonate, and di(2-ethylhexyl) Percarbonate, butyl neodecanoate, dipropyl percarbonate, diisopropyl percarbonate, diethoxyethyl percarbonate, diethoxyhexyl percarbonate, hexyl percarbonate, methyl ethyl ketone peroxide, cyclohexanone peroxide, dimethoxybutyl percarbonate, bis(3-methoxy-3-methoxybutyl) percarbonate, dibutyl percarbonate, di(hexadecyl) percarbonate, ditetradecyl percarbonate, cumene hydroperoxide, tert-butyl peroxide, 1,1,3,One or more of the following: 3-Tetramethylbutyl neopentanoate, hexyl neopentanoate, butyl neopentanoate, trimethylhexanoyl peroxide, dimethylhydroxybutyl neodecanoate, pentyl neodecanoate, butyl neodecanoate, tert-butyl neoheptanate, pentyl neopentanoate, tert-butyl neopentanoate, tert-pentyl peroxide (2-ethylhexanoate), lauroyl peroxide, and dilauryl peroxide; more preferably, tert-butyl neodecanoate, benzoyl peroxide, dibutyl peroxide dicarbonate, tert-butyl peroxide (2-ethylhexanoate), tert-butyl peroxide acetate, tetramethylbutyl neodecanoate, dodecyl peroxide, bis(4-butylcyclohexyl) peroxide dicarbonate, di(2-ethylhexyl) peroxide carbonate, and butyl neodecanoate. The following are included in the list of esters, including dipropyl peroxide dicarbonate, diisopropyl peroxide dicarbonate, diethoxyethyl peroxide dicarbonate, diethoxyhexyl peroxide dicarbonate, hexyl peroxide dicarbonate, methyl ethyl ketone peroxide, cyclohexanone peroxide, dimethoxybutyl peroxide dicarbonate, bis(3-methoxy-3-methoxybutyl) peroxide dicarbonate, dibutyl peroxide dicarbonate, di(hexadecyl) peroxide dicarbonate, ditetradecyl peroxide dicarbonate, cumene hydroperoxide, tert-butyl peroxide, 1,1,3,3-tetramethylbutyl peroxypentanoate, hexyl peroxypentanoate, butyl peroxypentanoate, trimethylhexanoyl peroxide, tert-butyl peroxypentanoate, tert-amyl peroxide (2-ethyl)hexanoate, lauroyl peroxide, and dilauryl peroxide.

[0024] In this invention, the reducing agent includes one or more of N,N'-dimethylaniline, N,N'-dimethyl-p-methylaniline, N,N'-di(2-hydroxypropyl)-p-toluidine, N-methyl-N-2-hydroxyethyl-p-toluidine, N-methyl-N-(2-methacryloyloxyethyl)aniline, and N-methyl-N-(2-methacryloyloxyethyl)-p-toluidine, preferably N,N'-dimethylaniline or N,N'-dimethyl-p-methylaniline. The formulation may contain one or more of N,N'-di(2-hydroxypropyl)-p-toluidine, N-methyl-N-2-hydroxyethyl-p-toluidine, and N-methyl-N-(2-methacryloyloxyethyl)-p-toluidine, more preferably one or more of N,N'-dimethyl-p-methylaniline, N,N'-di(2-hydroxypropyl)-p-toluidine, N-methyl-N-2-hydroxyethyl-p-toluidine, and N-methyl-N-(2-methacryloyloxyethyl)-p-toluidine.

[0025] In this invention, in step 1), the temperature of the second mixing is 10~80℃, preferably 15~75℃, and more preferably 20~70℃; The viscosity of the binary resin solution is 20~400 mPa·s, preferably 30~380 mPa·s, and more preferably 50~350 mPa·s.

[0026] In this invention, the volume fraction of continuous fibers in the thermoplastic bistable tube is 50-80%, preferably 55-75%, and more preferably 60-70%.

[0027] In this invention, the composite temperature is 20~100℃, preferably 30~90℃, and more preferably 40~80℃; the composite time is 1~48h, preferably 3~44h, and more preferably 5~40h. The curing temperature is 60~120℃, preferably 65~115℃, and more preferably 70~110℃; the curing time is 1~48h, preferably 3~44h, and more preferably 5~40h.

[0028] In this invention, the thermoplastic matrix includes one or more of polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), and polyamide (PA).

[0029] Thermoplastic polymers are a class of materials that soften upon heating and harden upon cooling without undergoing any chemical change. Compared to thermosetting polymers, thermoplastic polymers have the following advantages: Reprocessability: They can maintain their properties through multiple heating and cooling cycles, making them suitable for recycling; High toughness: They possess good impact strength and fracture toughness, making them suitable for applications requiring impact resistance; Ease of molding: They can be processed through various molding methods such as injection molding, extrusion, and hot pressing, making them suitable for large-scale production; Environmental friendliness: Compared to thermosetting materials, thermoplastic materials generate less pollution during production and recycling. Polymethyl methacrylate (PMMA), as a common thermoplastic material, can be used as a matrix material for bistable composite materials due to its excellent mechanical properties and processing characteristics.

[0030] To further improve the mechanical properties of thermoplastic bistable composites, reinforcing materials are typically added to the matrix material. Common reinforcing materials include glass fiber (GF), carbon fiber (CF), and basalt fiber (BF). The main functions of these reinforcing materials include: improving strength and stiffness: reinforcing materials can significantly improve the tensile strength, flexural strength, and modulus of composites; improving durability: reinforcing materials help improve the fatigue resistance and corrosion resistance of composites; and optimizing bistable properties: by rationally selecting the type and content of reinforcing materials, the bistable behavior of composites can be optimized, giving them better stability under different conditions.

[0031] The present invention also provides a thermoplastic bistable tube prepared by the aforementioned preparation method.

[0032] In this invention, the diameter of the thermoplastic bistable tube is 0.01~1m.

[0033] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0034] Example 1

[0035] 20 wt% of polymethyl methacrylate (MMA) monomer was dissolved in a MMA monomer solution to form a binary resin solution. 8.4 g of benzoyl peroxide was dissolved in 700 g of the binary resin solution, and then 3.5 g of N,N-dimethylaniline was added. After mixing evenly at 40 °C, a solution for injection with a viscosity of 150 mPa·s was obtained. The infusion solution was injected into four layers of uniaxial glass fiber cloth (using a C-type stainless steel mold) under a vacuum pressure of 0.085 MPa. The areal density of the fiber cloth was 1250 g / m². 2 The composite was applied at 35℃ for 24 hours, followed by curing at 100℃. After complete curing for 3 hours, the product was demolded and treated to obtain a thermoplastic bistable tube with a continuous fiber volume fraction of 70%.

[0036] The thermoplastic bistable tube prepared in Example 1 was used to prepare composite samples according to ISO international standards. The resulting material had a tensile strength of 1135.2 MPa in the 0° direction and a flexural strength of 1102.5 MPa.

[0037] Example 2

[0038] 20 wt% of polymethyl methacrylate (MMA) monomer was dissolved in a MMA monomer solution to form a binary resin solution. 1.5 wt% of benzoyl peroxide (MMA) monomer was dissolved in the binary resin solution. Then, 0.5 wt% of N,N-dimethylaniline (MMA) monomer was added. After mixing evenly at 40°C, a solution for injection with a viscosity of 150 mPa·s was obtained. Glass fiber (GF) is cut to the appropriate size according to design requirements and laid at the entrance of the pultrusion mold. Unidirectional or braided fibers can be selected as needed to achieve the best mechanical properties. A fiber guiding device is set at the mold entrance to ensure that the fibers can be evenly distributed and enter the mold. Install the pultrusion machine, including the fiber introduction system, resin impregnation system, heating zone, and traction device; prepare the binary resin solution and heat it above its melting point (usually 150°C to 200°C) to completely melt it; introduce the pre-laid glass fibers into the resin impregnation tank through the fiber guiding device, allowing the fibers to fully impregnate the PMMA resin; the impregnated fiber bundles are guided into the heating zone for curing; the temperature of the heating zone is controlled between 180 and 220°C to ensure complete resin curing; use the traction device to continuously pull the impregnated and cured fiber bundles from the mold and rapidly cool them through the cooling zone to ensure the shape stability of the composite material; the cooled composite material is then cut into finished products of the required length.

[0039] The thermoplastic bistable tube prepared in Example 2 was used to prepare composite samples according to the ISO international standard. The tensile strength of the obtained material in the 0° direction was 1235 MPa and the flexural strength was 1203 MPa.

[0040] Example 3

[0041] 15 wt% of polymethyl methacrylate (MMA monomer) was dissolved in a MMA monomer solution to form a binary resin solution. 2 wt% of benzoyl peroxide (MMA monomer) was dissolved in the binary resin solution. 0.6 wt% of N,N-dimethylaniline (MMA monomer) was then added. After mixing thoroughly at 40°C, a solution for injection with a viscosity of 200 mPa·s was obtained. The infusion solution was injected into four layers of carbon fiber under a vacuum pressure of 0.085 MPa. The areal density of the fiber cloth was 1250 g / m². 2 The composite material was laminated at 50℃ for 24 hours, then cured at 110℃ for 3 hours. After complete curing, it was demolded and treated to obtain a thermoplastic bistable tube with a continuous fiber volume fraction of 70%.

[0042] The thermoplastic bistable tube prepared in Example 1 was used to prepare composite samples according to ISO international standards. The resulting material had a tensile strength of 1123.5 MPa in the 0° direction and a flexural strength of 1094.2 MPa.

[0043] As can be seen from the above embodiments, the present invention provides a thermoplastic bistable tube and its preparation method. The preparation method of the thermoplastic bistable tube includes the following steps: mixing PMMA and MMA monomers to obtain a binary resin solution; adding an oxidant and a reducing agent to the binary resin solution for a second mixing to obtain a casting solution; and compounding the casting solution and continuous fibers using a vacuum or high-pressure flow molding method, followed by curing to obtain a thermoplastic bistable tube. The present invention uses a PMMA / MMA binary resin mixture solution, which avoids explosive polymerization that could damage the performance of the composite material, and eliminates the need for heating with electrical energy, simplifying the design and processing costs of composite molds and achieving double the cost savings and efficiency gains.

[0044] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a thermoplastic bistable tube, characterized in that, Includes the following steps: 1) Mix PMMA and MMA monomers to obtain a binary resin solution. Add oxidant and reducing agent to the binary resin solution for a second mixing to obtain a solution for infusion. 2) The injection solution and continuous fibers are combined by vacuum or high-pressure flow molding method, and then cured to obtain a thermoplastic bistable tube.

2. The method for preparing the thermoplastic bistable tube according to claim 1, characterized in that, The amount of PMMA added is 2-20% of the mass of the MMA monomer; The amount of oxidant added is 0.2-3% of the mass of MMA monomer; The amount of reducing agent added is 0 to 1% of the mass of MMA monomer.

3. The method for preparing the thermoplastic bistable tube according to claim 1 or 2, characterized in that, The MMA monomer includes one or more of acrylic acid, methacrylic acid, methyl methacrylate, butyl methacrylate, acrylamide, and methacrylamide; The continuous fibers include glass fibers, carbon fibers, mineral-derived fibers, or plant-derived fibers.

4. The method for preparing the thermoplastic bistable tube according to claim 3, characterized in that, The oxidizing agents include tert-butyl peroxynedecanoate, benzoyl peroxide, dibutyl peroxydicarbonate, tert-butyl peroxy(2-ethylhexanoate), tert-butyl peroxyacetate, tetramethylbutyl peroxynedecanoate, dodecyl peroxide, bis(4-butylcyclohexyl) peroxydicarbonate, di(2-ethylhexyl) peroxydicarbonate, butyl peroxynedecanoate, dipropyl peroxydicarbonate, diisopropyl peroxydicarbonate, diethoxyethyl peroxydicarbonate, diethoxyhexyl peroxydicarbonate, hexyl peroxydicarbonate, methyl ethyl ketone peroxide, cyclohexanone peroxide, dimethoxybutyl peroxydicarbonate, and bis(3-methoxy-3-methoxybutyl) peroxydicarbonate. The following are one or more of the following: ester, dibutyl peroxydicarbonate, di(hexadecyl)dicarbonate peroxide, ditetradecyl peroxydicarbonate, cumene hydroperoxide, tert-butyl peroxybenzoate, 1,1,3,3-tetramethylbutyl peroxyneopentate, hexyl peroxyneopentate, butyl peroxyneopentate, trimethylhexanoyl peroxide, dimethylhydroxybutyl peroxyneopentate, pentyl peroxyneopentate, tert-butyl peroxyneopentate, pentyl peroxyneopentate, tert-butyl peroxyneopentate, tert-butyl peroxyneopentate, tert-pentyl peroxyneopentate, tert-pentyl peroxyneopentate, tert-pentyl peroxyneopentate, lauroyl peroxide, dilauryl peroxide, didecyl peroxide, peracetic acid, and potassium persulfate.

5. The method for preparing the thermoplastic bistable tube according to claim 1, 2, or 4, characterized in that, The reducing agent includes one or more of N,N'-dimethylaniline, N,N'-dimethyl-p-methylaniline, N,N'-di(2-hydroxypropyl)-p-toluidine, N-methyl-N-2-hydroxyethyl-p-toluidine, N-methyl-N-(2-methacryloyloxyethyl)aniline, and N-methyl-N-(2-methacryloyloxyethyl)-p-toluidine.

6. The method for preparing the thermoplastic bistable tube according to claim 5, characterized in that, In step 1), the temperature for the second mixing is 10~80℃; The viscosity of the binary resin solution is 20~400 mPa·s.

7. The method for preparing the thermoplastic bistable tube according to claim 6, characterized in that, The volume fraction of continuous fibers in the thermoplastic bistable tube is 50-80%.

8. The method for preparing the thermoplastic bistable tube according to claim 7, characterized in that, The composite temperature is 20~100℃, and the composite time is 1~48h; The curing temperature is 60~120℃, and the curing time is 1~48h.

9. A thermoplastic bistable tube prepared by the preparation method according to any one of claims 1 to 8.

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