Multilayer polymer composite workpieces, their preparation methods and applications

Abstract

This application provides a multilayer polymer composite workpiece, its preparation method, and its application. The preparation method includes the following steps: contacting a first polymer solution with the surface of a second polymer workpiece, whereby the first polymer solution dissolves the surface layer of the second polymer workpiece, with at least a portion of the first polymer solution adhering to the surface layer of the second polymer workpiece, thus obtaining a primary polymer workpiece; removing the primary polymer workpiece, where a portion of the solvent in the first polymer solution leaves the surface layer of the primary polymer workpiece, resulting in a multilayer polymer composite workpiece. The preparation method of the multilayer polymer composite workpiece provided by this application utilizes the miscibility of the first and second polymer materials, adhering the first polymer solution to the surface of the second polymer workpiece to form a multilayer polymer composite workpiece. The process eliminates the need for multilayer material extrusion molding, avoids the influence of temperature differences during processing of the first and second polymers, and is convenient to operate.

Description

Technical Field

[0001] This application belongs to the field of medical materials technology, and more specifically, relates to multilayer polymer composite workpieces, their preparation methods and applications. Background Technology

[0002] Balloon dilation catheters are therapeutic vascular interventional devices used to dilate stenotic lesions and restore blood flow. With continuous updates and iterations of balloon dilation catheters, and evolving clinical needs, higher challenges are being placed on their performance. For example, there is a need for high pressure resistance combined with excellent vascular permeability, allowing for free and flexible sliding, bending, and dilation within tortuous blood vessels.

[0003] Polyamide has many properties such as good mechanical strength, toughness, tensile strength, compressive strength, wear resistance, and plasticity. Therefore, polyamide tubing is often used as one of the basic raw materials for preparing balloons.

[0004] The material structure of copolymer thermoplastic elastomers consists of crystalline hard segments (plastic phase) and amorphous soft segments (rubber phase). The soft segments provide ductility and flexibility, while the hard segments provide physical cross-linking. This material structure makes it a special type of material with properties between thermoplastic plastics and rubber. In addition, by combining different types and proportions of hard and soft segments, elastomer products with a wide range of hardness can be obtained.

[0005] Polyamide is relatively rigid and has higher strength, resulting in excellent pressure resistance for polyamide balloons. However, the rigidity of polyamide limits the flexibility of balloon catheters in blood vessels. In the development of new balloons, some researchers have combined polyamide with thermoplastic elastomers to adjust balloon performance and find a balance between strength and flexibility. For example, a bilayer polyamide / thermoplastic elastomer tubing has been successfully extruded using an extrusion process to prepare a bilayer balloon, which to some extent improves upon the limitations of single-material balloons.

[0006] However, the extrusion of this type of double-layer tube is limited by factors such as the extrusion equipment and the processable temperature of the material. When the thickness of one layer of material in the tube is low or the difference in the processable temperature of the two materials is too large, this extrusion process will face challenges. Summary of the Invention

[0007] Based on this, one objective of this application is to provide a method for preparing multilayer polymer composite workpieces, in order to solve the technical problem that the extrusion of commonly used polyamide / thermoplastic elastomer double-layer tubes is limited by factors such as extrusion equipment and the processable temperature of the materials. When the thickness of one layer of material in the tube is low or the difference in the processable temperature of the two materials is too large, this extrusion process will face challenges.

[0008] Another objective of this application is to provide multilayer polymer composite workpieces.

[0009] Another objective of this application is to provide applications for multilayer polymer composite workpieces.

[0010] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0011] A method for preparing a multilayer polymer composite workpiece includes the following steps:

[0012] S01: The first polymer solution is brought into contact with the surface of the second polymer workpiece, the first polymer solution dissolves the surface layer of the second polymer workpiece, and at least part of the first polymer solution adheres to the surface layer of the second polymer workpiece to obtain a primary polymer workpiece;

[0013] S02: The primary polymer workpiece is removed, and part of the solvent in the first polymer solution evaporates from the surface of the primary polymer workpiece to obtain a multilayer polymer composite workpiece.

[0014] Alternatively, the first polymer solution is coated onto the second polymer workpiece and left to stand for a preset time to obtain the initial polymer workpiece.

[0015] Optionally, step S01 includes the following steps:

[0016] The second polymer workpiece is immersed in the first polymer solution and left to stand for a preset time to obtain the initial polymer workpiece;

[0017] Alternatively, the first polymer solution is coated onto the second polymer workpiece and left to stand for a preset time to obtain the initial polymer workpiece.

[0018] Optionally, the preset resting time is 1s-120s.

[0019] Optionally, step S01 includes the following steps:

[0020] The first polymer solution dissolves the surface layer of the second polymer workpiece, causing the surface layer of the second polymer workpiece to liquefy and form a liquefied layer. At least a portion of the first polymer solution adheres to the liquefied layer of the second polymer workpiece, thus obtaining a primary polymer workpiece.

[0021] Optionally, step S02 includes the following steps:

[0022] The primary polymer workpiece is removed from the surface of the first polymer solution and then placed in a ventilated environment for curing at a set ambient temperature. The solvent in the first polymer solution evaporates, resulting in a multilayer polymer composite workpiece.

[0023] Optionally, the curing time is 0.5 min to 30 min.

[0024] Optionally, the second polymer workpiece is a polyamide workpiece; and / or,

[0025] The first polymer solution is a copolymeric thermoplastic elastomer solution.

[0026] Optionally, the method for preparing the first polymer solution includes the following steps:

[0027] The copolymeric thermoplastic elastomer is dissolved in a solvent at 20℃-80℃ to obtain a first polymer solution; and / or,

[0028] The mass concentration of the first polymer solution is 1%-40%.

[0029] And, a multilayer polymer composite workpiece, made using the above-described method for preparing multilayer polymer composite workpieces.

[0030] Optionally, the structure of the multilayer polymer composite workpiece sequentially includes a first polymer layer and a second polymer workpiece; or, the second polymer workpiece and the first polymer layer; or, the first polymer layer, the second polymer workpiece and the first polymer layer; or, the second polymer layer, the first polymer workpiece and the second polymer layer.

[0031] Optionally, a fiber layer may also be included between the first polymer layer and the second polymer workpiece.

[0032] Optionally, the multilayer polymer composite workpiece can be a regular or irregular tube, rod, capsule, sheet, block, membrane, tank, box, or line; or a hollow or solid tube, tank, box, line, rod, capsule, sheet, block, or membrane.

[0033] And, the application of a multilayer polymer composite workpiece as described above in medical catheters.

[0034] The beneficial effects of this application are as follows:

[0035] 1. The method for preparing multilayer polymer composite workpieces provided in this application utilizes the miscibility of the first polymer and the second polymer. The first polymer solution contacts the surface of the second polymer workpiece, dissolving the surface layer of the second polymer workpiece. Part of the first polymer solution mixes with the liquid on the surface of the second polymer workpiece, causing the molecular chains of the first polymer to rapidly diffuse into the liquid on the surface of the second polymer workpiece, interpenetrating and entangle with the molecular chains of the second polymer. After curing, the solvent in the first polymer solution evaporates, and the first polymer solidifies on the surface of the second polymer workpiece, forming a first polymer layer. The second polymer workpiece can be considered as the core layer, constituting a multilayer polymer composite workpiece with the first polymer layer. The first polymer layer and the surface layer of the second polymer workpiece are tightly bonded. The method for preparing multilayer polymer composite workpieces in this application eliminates the need for multilayer material extrusion molding, avoids the influence of temperature differences during processing of the first and second polymers, and is convenient to operate, facilitating industrial application.

[0036] 2. The multilayer polymer composite workpiece provided in this application combines the properties of the first polymer and the second polymer, such as tensile strength, thereby improving the properties of the multilayer polymer composite workpiece. Moreover, the first polymer layer and the second polymer workpiece are tightly bonded together, resulting in a stable structure that can be applied to medical catheters. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0038] Figure 1 This is a schematic diagram of the structure of the multilayer polymer composite workpiece in Embodiment 1 of this application;

[0039] Figure 2 This is a schematic diagram of step S02 in the method for preparing a multilayer polymer composite workpiece in Embodiment 1 of this application;

[0040] Figure 3 This is a schematic diagram of the structure of the multilayer polymer composite workpiece of Embodiment 1 of this application as a medical balloon;

[0041] Figure 4 This is a schematic diagram of the structure of the multilayer polymer composite workpiece in Embodiment 2 of this application;

[0042] Figure 5 This is a schematic diagram of step S02 in the method for preparing a multilayer polymer composite workpiece according to Embodiment 2 of this application;

[0043] Figure 6 This is a schematic diagram of the structure of the multilayer polymer composite workpiece used as a medical balloon in Embodiment 2 of this application;

[0044] Figure 7 This is a schematic diagram of the structure of the multilayer polymer composite workpiece in Embodiment 3 of this application;

[0045] Figure 8 This is a schematic diagram of step S02 in the method for preparing a multilayer polymer composite workpiece according to Embodiment 3 of this application;

[0046] Figure 9 This is a schematic diagram of the structure of the multilayer polymer composite workpiece used as a medical balloon in Embodiment 3 of this application;

[0047] Figure 10 This is a schematic diagram of the structure of the multilayer polymer composite workpiece in Embodiment 4 of this application;

[0048] Figure 11 This is a schematic diagram of step S02 in the method for preparing the multilayer polymer composite workpiece of Embodiment 4 of this application;

[0049] Figure 12 This is a schematic diagram of the structure of the multilayer polymer composite workpiece in Embodiment 5 of this application;

[0050] Figure 13 This is a schematic diagram of the structure of the multilayer polymer composite workpiece in Embodiment 6 of this application;

[0051] Figure 14 This is a schematic diagram of the structure of the multilayer polymer composite workpiece in Embodiment 7 of this application.

[0052] Explanation of reference numerals in the attached figures:

[0053] 10. Multilayer polymer composite parts; 11. Copolymer thermoplastic elastomer layer; 12. Polyamide parts; 13. Fiber layer;

[0054] 20. Medical balloon. Detailed Implementation

[0055] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0056] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0057] A method for preparing a multilayer polymer composite workpiece according to an embodiment of this application includes the following steps:

[0058] S01: The first polymer solution is brought into contact with the surface of the second polymer workpiece, the first polymer solution dissolves the surface layer of the second polymer workpiece, and at least part of the first polymer solution adheres to the surface layer of the second polymer workpiece to obtain the primary polymer workpiece.

[0059] Taking advantage of the miscibility of the first polymer and the second polymer, the first polymer solution comes into contact with the surface of the second polymer workpiece, and the surface layer of the second polymer workpiece is dissolved by the first polymer solution. Part of the first polymer solution mixes with the liquid on the surface of the second polymer workpiece, and the molecular chains of the first polymer quickly diffuse into the liquid on the surface of the second polymer workpiece, interpenetrating and entangled with the molecular chains of the second polymer, laying the foundation for subsequent curing and tight bonding.

[0060] Optionally, step S01 includes the following steps:

[0061] The second polymer workpiece is immersed in the first polymer solution and left to stand for a preset time to obtain the initial polymer workpiece;

[0062] Alternatively, the first polymer solution is coated onto the second polymer workpiece and left to stand for a preset time to obtain the initial polymer workpiece.

[0063] The first polymer solution is brought into contact with the second polymer workpiece by immersion or coating, which helps to uniformly cover the surface of the second polymer workpiece with the first polymer solution, forming a first polymer layer of uniform thickness.

[0064] When the method of immersing the second polymer workpiece in the first polymer solution is selected, the second polymer workpiece may optionally be immersed in the first polymer solution perpendicular to the surface of the first polymer solution. Vertical immersion of the second polymer workpiece in the first polymer solution facilitates the uniform coating of the first polymer solution onto the surface of the second polymer workpiece, forming a liquefied layer and a first polymer layer of uniform thickness.

[0065] According to the experiment, the preset time for immersing the second polymer workpiece in the first polymer solution can be selected from 1s to 120s. If the immersion time is too short, such as less than 1s, the surface of the second polymer workpiece will not be completely coated with the first polymer solution, resulting in uneven coating of the first polymer solution. If the immersion time is too long, such as greater than 120s, the surface layer of the second polymer workpiece will liquefy too much, which may cause the thickness of the second polymer workpiece to be reduced too much, affecting the hardness or other properties of the multilayer polymer composite workpiece. Moreover, the excessive time reduces production efficiency.

[0066] In some embodiments, step S01 includes the following steps:

[0067] The first polymer solution dissolves the surface layer of the second polymer workpiece, causing the surface layer of the second polymer workpiece to liquefy and form a liquefied layer. At least a portion of the first polymer solution adheres to the liquefied layer of the second polymer workpiece, thus obtaining a primary polymer workpiece.

[0068] The first polymer and the second polymer are compatible. The surface of the second polymer workpiece is dissolved and liquefied by the first polymer solution to form a liquefied layer. Part of the first polymer solution mixes with the liquid in the liquefied layer. The molecular chains of the first polymer quickly diffuse into the liquefied layer and interpenetrate and entangle with the molecular chains of the second polymer. The first polymer can be tightly bonded to the surface of the second polymer workpiece, reducing the problem of delamination damage.

[0069] Optionally, the second polymer workpiece is a polyamide workpiece. Polyamide workpieces have good mechanical strength, tensile strength, toughness, compressive strength, wear resistance, and plasticity, and are one of the commonly used raw materials for preparing balloon catheters.

[0070] Optionally, the first polymer solution is a copolymeric thermoplastic elastomer solution, the solvent of which has a certain dissolving effect on polyamide. The copolymeric thermoplastic elastomer has extensibility and flexibility, and when used in combination with the properties of polyamide, the strength and flexibility of multilayer polymer composite workpieces can be comprehensively adjusted.

[0071] Optionally, the first polymer may be at least one of styrene block copolymer (TPS), thermoplastic polyurethane (TPU), thermoplastic polyamide (TPA), and thermoplastic copolyester (TPA).

[0072] Optionally, the solvent of the first polymer solution may be a solvent such as tetrahydrofuran, formic acid, toluene, dimethyl sulfoxide, dichloromethane, chloroform, m-cresol, hexafluoroisopropanol, or n-butanol. These solvents can dissolve the first polymer, so that the first polymer is uniformly cured on the surface of the second polymer workpiece.

[0073] Optionally, the method for preparing the first polymer solution includes the following steps:

[0074] The copolymerized thermoplastic elastomer is dissolved in a solvent at 20℃-80℃ to obtain the first polymer solution. The higher the dissolution temperature, the faster the polymer dissolves.

[0075] Optionally, the mass concentration of the first polymer solution is 1%-40%. By controlling the mass concentration of the first polymer solution, the amount of the first polymer layer attached to the surface of the second polymer workpiece can be controlled, that is, the thickness of the first polymer layer can be controlled.

[0076] Optionally, the second polymer workpiece can be a regular or irregular tube, rod, capsule, sheet, block, membrane, tank, box, or wire; or a hollow or solid tube, tank, box, wire, rod, capsule, sheet, block, or membrane. The manufactured multilayer polymer composite workpiece can also be a regular or irregular tube, rod, capsule, sheet, block, membrane, tank, box, or wire; or a hollow or solid tube, tank, box, wire, rod, capsule, sheet, block, or membrane.

[0077] Understandably, when the second polymer workpiece is a hollow structure such as a tube, bladder, can, or box, the first polymer solution adheres to the surface of the second polymer workpiece, which can be an outer surface, an inner surface, or both.

[0078] When the first polymer solution is applied to the outer surface of the second polymer workpiece, the structure of the multilayer polymer composite workpiece, from the outside to the inside, includes the first polymer layer and the second polymer workpiece.

[0079] When the first polymer solution adheres to the inner surface of the second polymer workpiece, that is, it adheres to the inner channel of the second polymer workpiece, the structure of the multilayer polymer composite workpiece includes the second polymer workpiece and the first polymer layer from the outside to the inside.

[0080] When the first polymer solution is applied to the outer and inner surfaces of the second polymer workpiece, the structure of the multilayer polymer composite workpiece, from the outside to the inside, includes the first polymer layer, the second polymer workpiece, and the first polymer layer.

[0081] When the second polymer solution is applied to the outer and inner surfaces of the first polymer workpiece, the structure of the multilayer polymer composite workpiece, from the outside to the inside, includes the second polymer layer, the first polymer workpiece, and the second polymer layer.

[0082] S02: The primary polymer workpiece is removed, and part of the solvent in the first polymer solution evaporates from the surface of the primary polymer workpiece to obtain a multilayer polymer composite workpiece.

[0083] If some of the solvent in the first polymer solution leaves the primary polymer workpiece, the first polymer will solidify on the surface of the second polymer workpiece to form a first polymer layer. The second polymer workpiece can be regarded as the core layer, which together with the first polymer layer constitutes a multilayer polymer composite workpiece. The first polymer layer is tightly bonded to the surface layer of the second polymer workpiece.

[0084] Optionally, step S02 includes the following steps:

[0085] The primary polymer workpiece is removed from the surface of the first polymer solution and then placed in a ventilated environment for curing at a set ambient temperature to obtain a multilayer polymer composite workpiece.

[0086] After the primary polymer workpiece is removed from the first polymer solution, the solvent in the first polymer solution evaporates, forming a first polymer layer that adheres to the surface of the second polymer workpiece, resulting in a multilayer polymer composite workpiece.

[0087] During the curing process, the curing speed of the polymer solution is controlled by setting the ambient temperature. The ambient temperature can be set as needed, such as 20℃, 22℃, 25℃, 30℃, etc.

[0088] Optionally, the primary polymer workpiece is withdrawn from the liquid surface in a direction perpendicular to the first polymer solution. As the primary polymer workpiece is withdrawn perpendicularly from the first polymer solution, the liquid on the surface of the second polymer workpiece flows along the extension direction of the second polymer workpiece under the influence of gravity, fully wetting the surface of the second polymer workpiece.

[0089] Alternatively, during the curing process, the primary polymer workpiece is placed vertically and stationary.

[0090] Depending on the type of solvent and the concentration of the first polymer solution, the curing time can be selected from 0.5 min to 30 min. Within this time range, the first polymer solution adhering to the surface of the second polymer workpiece is basically cured.

[0091] The method for preparing multilayer polymer composite workpieces in this application does not require multilayer material extrusion molding, avoids the influence of the temperature difference between the first polymer and the second polymer during processing, and is convenient to operate and conducive to industrial promotion.

[0092] This application also provides multilayer polymer composite workpieces manufactured using the above-described method for preparing multilayer polymer composite workpieces.

[0093] Optionally, the structure of the multilayer polymer composite workpiece may include a first polymer layer and a second polymer workpiece in sequence; or, the second polymer workpiece and the first polymer layer; or, the first polymer layer, the second polymer workpiece and the first polymer layer; or, the second polymer layer, the first polymer workpiece and the second polymer layer.

[0094] Optionally, a fiber layer may also be included between the first polymer layer and the second polymer workpiece. The fibers in the fiber layer can be high-performance fibers such as polyamide, ultra-high molecular weight polyethylene fiber, aramid fiber, or LCP fiber. When the first polymer solution comes into contact with the second polymer workpiece, some of the first polymer solution penetrates into these fibers and then contacts the surface of the second polymer workpiece. After the first polymer solution solidifies, the first polymer layer will encapsulate the fiber layer and tightly bond the fiber layer to the surface of the second polymer workpiece. In some embodiments, the fiber layer is formed by fiber threads wound around the outer surface of the second polymer workpiece.

[0095] Optionally, the multilayer polymer composite workpiece can be a regular or irregular tube, rod, capsule, sheet, block, or membrane; or a hollow or solid tube, rod, capsule, sheet, block, or membrane.

[0096] The multilayer polymer composite workpiece provided in this application combines the properties of the first polymer and the second polymer, such as tensile strength, thereby improving the properties of the multilayer polymer composite workpiece. Moreover, the first polymer layer and the second polymer workpiece are tightly bonded together, resulting in a stable structure that can be applied to medical catheters.

[0097] The following examples illustrate this point.

[0098] Example 1

[0099] In this embodiment, the multilayer polymer composite workpiece 10 is a material tube, and its structure is as follows: Figure 1 As shown, from the outside to the inside, there are three layers of material tube workpiece: copolymer thermoplastic elastomer layer 11, polyamide workpiece 12, copolymer thermoplastic elastomer layer 11, and so on.

[0100] The method for preparing the multilayer polymer composite workpiece 10 in this embodiment includes the following steps:

[0101] S01: Under heating and stirring conditions at 65℃, the copolymer thermoplastic elastomer resin is dissolved in a solvent to prepare a copolymer thermoplastic elastomer solution with a mass concentration of 10%.

[0102] S02: Immerse the entire polyamide workpiece (inner diameter 3mm, outer diameter 3.25mm) in a copolymer thermoplastic elastomer solution, such as... Figure 2 As shown, after standing for 30 seconds, a preliminary polymer workpiece is obtained.

[0103] S03: The liquid surface of the vertical copolymer thermoplastic elastomer solution of the primary polymer workpiece is uniformly removed. Then, under the ventilation environment of 25°C, the primary polymer workpiece is kept vertical and stationary. The solvent of the copolymer thermoplastic elastomer solution fluid layer attached to the surface of the polyamide workpiece evaporates, and the copolymer thermoplastic elastomer is cured to form a copolymer thermoplastic elastomer layer 11, thus obtaining a multilayer polymer composite workpiece 10.

[0104] The multilayer polymer composite workpiece 10 of this embodiment is used as the structure of a medical balloon 20, as shown below. Figure 3 As shown.

[0105] Example 2

[0106] In this embodiment, the multilayer polymer composite workpiece 10 is a material tube, and its structure is as follows: Figure 4 As shown, from the outside to the inside, there is a polyamide workpiece 12, a copolymer thermoplastic elastomer layer 11, and a double-layer tube workpiece.

[0107] The method for preparing the multilayer polymer composite workpiece 10 in this embodiment includes the following steps:

[0108] S01: Under heating and stirring conditions at 50°C, the copolymer thermoplastic elastomer resin is dissolved in a solvent to prepare a copolymer thermoplastic elastomer solution with a mass concentration of 3%.

[0109] S02: Keeping the workpiece vertically downward, inject the copolymer thermoplastic elastomer solution into the polyamide workpiece (inner diameter 6mm, outer diameter 6.3mm) through the valve device, such as... Figure 5 As shown, after standing for 15 seconds, a primary polymer workpiece is obtained.

[0110] S03: The copolymer thermoplastic elastomer solution is uniformly drawn out through the valve device, and the primary polymer workpiece is kept vertical and stationary in a ventilated environment at 35°C. The copolymer thermoplastic elastomer solution fluid to be attached is solidified on the surface of the polyamide workpiece to form a copolymer thermoplastic elastomer layer 11, thus obtaining a multilayer polymer composite workpiece 10.

[0111] The multilayer polymer composite workpiece of this embodiment is used as the structure of a medical balloon 20, as shown below. Figure 6 As shown.

[0112] Example 3

[0113] In this embodiment, the multilayer polymer composite workpiece 10 is a material tube, and its structure is as follows: Figure 7 As shown, from the outside to the inside, there is a copolymer thermoplastic elastomer layer 11, a polyamide workpiece 12, and a double-layer tube workpiece.

[0114] The method for preparing the multilayer polymer composite workpiece 10 in this embodiment includes the following steps:

[0115] S01: Under heating and stirring conditions at 80℃, the copolymer thermoplastic elastomer resin is dissolved in a solvent to prepare a copolymer thermoplastic elastomer solution with a mass concentration of 5%.

[0116] S02: Keep the polyamide workpiece (inner diameter 1mm, outer diameter 1.2mm) vertically downwards, seal the lower opening of the polyamide workpiece, and then immerse the polyamide workpiece in a copolymer thermoplastic elastomer solution, such as... Figure 8 As shown, after standing for 5 seconds, a preliminary polymer workpiece is obtained.

[0117] S03: The primary polymer workpiece is uniformly removed perpendicular to the surface of the copolymer thermoplastic elastomer solution. Then, in a ventilated environment at 40°C, the primary polymer workpiece is kept vertical and stationary. The copolymer thermoplastic elastomer solution fluid to be attached is solidified on the surface of the polyamide workpiece to form a copolymer thermoplastic elastomer layer 11, resulting in a multilayer polymer composite workpiece 10.

[0118] The multilayer polymer composite workpiece of this embodiment is used as the structure of a medical balloon 20, as shown below. Figure 9 As shown.

[0119] Example 4

[0120] In this embodiment, the multilayer polymer composite workpiece 10 is a capsule, and its structure is as follows: Figure 10 As shown, from the outside to the inside, there is a copolymer thermoplastic elastomer layer 11 and a polyamide workpiece 12. The polyamide workpiece 12 has a capsule structure, and the multilayer polymer composite workpiece 10 is a double-layer capsule workpiece.

[0121] The method for preparing the multilayer polymer composite workpiece 10 in this embodiment includes the following steps:

[0122] S01: Under heating and stirring conditions at 80℃, the copolymer thermoplastic elastomer resin is dissolved in a solvent to prepare a copolymer thermoplastic elastomer solution with a mass concentration of 8%.

[0123] S02: The lower opening of the polyamide workpiece is closed. The polyamide workpiece is fully submerged, vertically downwards, in a copolymer thermoplastic elastomer solution. Figure 11 As shown, after standing for 5 seconds, a preliminary polymer workpiece is obtained.

[0124] S03: The primary polymer workpiece is uniformly removed perpendicular to the surface of the copolymer thermoplastic elastomer solution. Then, in a ventilated environment at 37°C, the primary polymer workpiece is kept vertical and stationary. The copolymer thermoplastic elastomer solution fluid to be attached is cured on the surface of the polyamide workpiece to form a copolymer thermoplastic elastomer layer 11, resulting in a multilayer polymer composite workpiece 10.

[0125] Example 5

[0126] In this embodiment, the multilayer polymer composite workpiece 10 is a braided tube, and its structure is as follows: Figure 12 As shown, from the outside to the inside, there is a copolymer thermoplastic elastomer layer 11, a fiber layer 13, and a polyamide workpiece 12. The outer periphery of the polyamide workpiece 12 is wrapped with fiber lines, which are polyamide lines. The fiber lines are wound to form the fiber layer 13. The multilayer polymer composite workpiece 10 is a three-layer tube workpiece.

[0127] The method for preparing the multilayer polymer composite workpiece 10 in this embodiment includes the following steps:

[0128] S01: Under heating and stirring conditions at 75°C, the copolymer thermoplastic elastomer resin is dissolved in a solvent to prepare a copolymer thermoplastic elastomer solution with a mass concentration of 15%.

[0129] S02: Seal the lower opening of the polyamide workpiece with the fiber layer wrapped around its outer periphery, then immerse it vertically downward in a copolymer thermoplastic elastomer solution. After standing for 5 seconds, a primary polymer workpiece is obtained.

[0130] S03: The primary polymer workpiece is uniformly removed from the surface of the copolymer thermoplastic elastomer solution. Then, in a ventilated environment at 25°C, the primary polymer workpiece is kept vertical and stationary. The copolymer thermoplastic elastomer solution fluid to be attached is solidified on the surface of the polyamide workpiece to form a copolymer thermoplastic elastomer layer 11, thus obtaining a multilayer polymer composite workpiece 10.

[0131] Example 6

[0132] In this embodiment, the multilayer polymer composite workpiece 10 is a linear body, and its structure is as follows: Figure 13 As shown, from the outside to the inside, there is a copolymer thermoplastic elastomer layer 11 and a polyamide workpiece 12, the polyamide workpiece 12 including multiple polyamide lines.

[0133] The method for preparing the multilayer polymer composite workpiece 10 in this embodiment includes the following steps:

[0134] S01: Under heating and stirring conditions at 70°C, the copolymer thermoplastic elastomer resin is dissolved in a solvent to prepare a copolymer thermoplastic elastomer solution with a mass concentration of 12%.

[0135] S02: The polyamide workpiece is vertically immersed in a copolymer thermoplastic elastomer solution under tension, and after standing for 5 seconds, a primary polymer workpiece is obtained.

[0136] S03: The primary polymer workpiece is uniformly removed from the surface of the copolymer thermoplastic elastomer solution. Then, in a ventilated environment at 25°C, the primary polymer workpiece is kept vertical and stationary. The copolymer thermoplastic elastomer solution fluid to be attached is solidified on the surface of the polyamide workpiece to form a copolymer thermoplastic elastomer layer 11, thus obtaining a multilayer polymer composite workpiece 10.

[0137] Example 7

[0138] In this embodiment, the multilayer polymer composite workpiece 10 is a plate, and its structure is as follows: Figure 14 As shown, from the outside to the inside, there is a copolymer thermoplastic elastomer layer 11 and a polyamide workpiece 12, which has a plate-like structure.

[0139] The method for preparing the multilayer polymer composite workpiece 10 in this embodiment includes the following steps:

[0140] S01: Under heating and stirring conditions at 75°C, the copolymer thermoplastic elastomer resin is dissolved in a solvent to prepare a copolymer thermoplastic elastomer solution with a mass concentration of 15%.

[0141] S02: The polyamide workpiece is vertically immersed in a copolymer thermoplastic elastomer solution and left to stand for 8 seconds to obtain a primary polymer workpiece.

[0142] S03: The primary polymer workpiece is uniformly removed from the surface of the copolymer thermoplastic elastomer solution. Then, in a ventilated environment at 30°C, the primary polymer workpiece is kept vertical and stationary. The copolymer thermoplastic elastomer solution fluid to be attached is solidified on the surface of the polyamide workpiece to form a copolymer thermoplastic elastomer layer 11, thus obtaining a multilayer polymer composite workpiece 10.

[0143] Using polyamide / copolymer thermoplastic elastomer double-layer co-extrusion tube 1 and double-layer co-extrusion tube 2 prepared by traditional extrusion process as a comparison, the inner diameter, outer diameter and tensile strength of the polyamide workpiece raw material and multilayer polymer composite workpiece of double-layer co-extrusion tube 1, double-layer co-extrusion tube 2 and Examples 1-3 were measured. The measurement results are shown in Table 1.

[0144] Table 1

[0145]

[0146] Table 2 shows the tensile strength of the polyamide workpiece raw materials and multilayer polymer composite workpieces in Examples 4-7 before and after dip coating.

[0147] Table 2

[0148]

[0149]

[0150] The test results show that the tensile strength of the multilayer polymer composite workpiece and the polyamide workpiece raw material is slightly lower. However, due to the addition of the copolymer thermoplastic elastomer layer, the multilayer polymer composite workpiece is more flexible than the polyamide workpiece raw material.

[0151] Compared to traditional extrusion processes, the method for preparing multilayer polymer composite parts in this application can produce thinner copolymer thermoplastic elastomer layers, and can finely adjust the thickness and shape structure of the multilayer polymer to achieve the expected mechanical properties of the product, and is conducive to the diversified structural design of the product.

[0152] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method of making a multilayer polymeric composite workpiece, characterized by: The method comprises the following steps: S01: contacting a first polymer solution with a surface of a second polymer workpiece, the first polymer solution dissolving and liquefying a surface layer of the second polymer workpiece to form a liquefied layer, molecular chains of the first polymer diffusing into the liquefied layer and interpenetrating and entangling with molecular chains of the second polymer, at least part of the first polymer solution adhering to the surface layer of the second polymer workpiece to obtain a primary polymer workpiece; S02: taking out the primary polymer workpiece, part of the solvent in the first polymer solution volatilizing from the surface of the primary polymer workpiece, the first polymer solidifying on the surface of the second polymer workpiece to form a first polymer layer, and obtaining a multilayer polymer composite workpiece; wherein the first polymer layer is tightly combined with the second polymer workpiece through the interpenetrating and entangling interface of the molecular chains.

2. The method of making a multilayer polymeric composite workpiece of claim 1, wherein: The step S01 comprises the following steps: immersing the second polymer workpiece in the first polymer solution and standing for a preset time to obtain the primary polymer workpiece; or, coating the first polymer solution on the second polymer workpiece and standing for a preset time to obtain the primary polymer workpiece.

3. The method of making a multilayer polymeric composite workpiece of claim 2, wherein: The preset standing time is 1 s-120 s.

4. The method of making a multilayer polymeric composite workpiece of claim 1, wherein: The step S02 comprises the following steps: taking the primary polymer workpiece out of the liquid surface of the first polymer solution, and then placing it in a ventilated environment to perform a solidification treatment at a set temperature, the solvent in the first polymer solution volatilizing to obtain the multilayer polymer composite workpiece.

5. The method of making a multilayer polymeric composite workpiece of claim 4, wherein: The solidification treatment time is 0.5 min-30 min.

6. The method of making a multilayer polymeric composite article of any of claims 1 to 5, wherein: The second polymer workpiece is a polyamide workpiece; and / or, The first polymer solution is a copolymer thermoplastic elastomer solution.

7. The method of making a multilayer polymeric composite workpiece of claim 6, wherein: The preparation method of the first polymer solution comprises the following steps: dissolving the copolymer thermoplastic elastomer in a solvent at 20℃-80℃ to obtain the first polymer solution; and / or, The mass concentration of the first polymer solution is 1%-40%.

8. A multi-layer polymeric composite workpiece, characterized by: The multilayer polymer composite workpiece is prepared by the method of any one of claims 1-7.

9. The multi-layer polymeric composite workpiece of claim 8, wherein: The structure of the multilayer polymer composite workpiece comprises a first polymer layer and a second polymer workpiece in sequence; or a second polymer workpiece and a first polymer layer; or a first polymer layer, a second polymer workpiece and a first polymer layer; or a second polymer layer, a first polymer workpiece and a second polymer layer.

10. The multi-layer polymeric composite workpiece of claim 9, wherein: The first polymer layer and the second polymer workpiece further comprise a fiber layer.

11. The multi-layer polymeric composite workpiece of claim 9, wherein: The multilayer polymer composite workpiece is a regular or irregular tube, rod, capsule, sheet, block, wire.

12. The multi-layer polymeric composite workpiece of claim 11, wherein: The sheet comprises a film.

13. The multi-layer polymeric composite workpiece of claim 11, wherein: The block comprises a tank or a box.

14. Use of the multilayer polymer composite workpiece of claim 9 in a medical catheter.

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