Shape memory alloy-viscoelastic polymer coaxial filament and manufacturing method thereof

Abstract

The present invention is applicable to the technical field of functional material manufacturing, and provides a shape memory alloy-viscoelastic polymer coaxial filament and a manufacturing method thereof, the method comprising: the two ends of the memory alloy wire are fixedly wound on the active winding wheel and the passive winding wheel respectively; the opening hole of the orifice plate is adjusted in the height and horizontal directions by adjusting the adjusting screws 1 and 2; the ultraviolet lamp is turned on and the motor is started; driven by the motor, the memory alloy wire is pulled horizontally at a uniform speed; when the memory alloy wire passes through the material box, the viscoelastic polymer is coated on the outside, and then passes through the orifice plate, the excess coating material is scraped off, and finally passes through the ultraviolet lamp, the viscoelastic polymer is solidified, and the shape memory alloy-viscoelastic polymer coaxial filament is obtained. The eccentricity of the coaxial filament of the present invention is adjustable, which expands the structural design and functional customization space of the shape memory alloy-viscoelastic polymer. In addition, the manufacturing method of the present invention is simple in process, saves materials and has low manufacturing cost.

Description

Technical Field

[0001] The invention belongs to the technical field of functional material manufacturing, and in particular relates to a shape memory alloy-viscoelastic polymer coaxial filament and a manufacturing method thereof. Background Art

[0002] As an energy-dissipating and vibration-damping material, shape memory alloys are increasingly attracting the attention of researchers due to their unique mechanical properties. The vibration attenuation capacity of a material can be characterized by internal friction (internal friction). The internal friction of metal materials is what vibration engineering calls damping. The greater the internal friction, the greater the vibration attenuation capacity of the metal material. For example, Ni-Ti alloys have a high vibration attenuation capacity because they lose energy through thermoelastic isomorphous phase transformation crystals or the movement of the parent phase and the isomorphous phase boundary. However, the high damping characteristics of shape memory alloys often require that their temperature be between the parent phase and the martensitic transformation temperature, and the high damping temperature range is relatively narrow. Viscoelastic polymer damping materials are commonly used polymer energy-absorbing materials under room temperature conditions. They are materials composed of molecules with energy storage capacity (elastic part) and energy loss capacity (viscous part) combined in different proportions. When subjected to alternating stress at room temperature, the mechanical energy acting on the elastic component is stored like potential energy and then returned to the outside world, while the part acting on the viscous component is converted into thermal energy of the material and dissipated.

[0003] Therefore, in order to achieve high damping properties of materials in a wide temperature range, the composite of shape memory alloys and viscoelastic polymers is an effective solution. At present, shape memory alloys are usually embedded in the matrix in the form of filaments, films, particles, fibers, etc., but the above schemes are difficult to control the position and distribution of the memory alloy in the matrix, and cannot achieve precise customization and dynamic regulation of the damping, vibration, and deformation characteristics of the shape memory alloy-viscoelastic polymer composite material. For this reason, a shape memory alloy-viscoelastic polymer coaxial filament and a manufacturing method thereof are proposed. Summary of the invention

[0004] The object of the present invention is to provide a shape memory alloy-viscoelastic polymer coaxial filament and a method for manufacturing the same, in order to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for manufacturing a shape memory alloy-viscoelastic polymer coaxial filament, the method is based on a device, the device comprising an active winding wheel, a passive winding wheel, a damper, a V-shaped directional wheel 1, a V-shaped directional wheel 2, a material box, a hole plate, an ultraviolet lamp, a motor, an adjusting screw 1 and an adjusting screw 2, a shape memory alloy wire and a viscoelastic polymer; a V-shaped directional wheel 1, a material box, a hole plate, an ultraviolet lamp and a V-shaped directional wheel 2 are sequentially arranged between the active winding wheel and the passive winding wheel from left to right; an opening hole is provided on the material box and the hole plate, the material box is used to load the viscoelastic polymer, and the adjusting screw 1 and the adjusting screw 2 are used to adjust the degree of freedom of the opening hole of the hole plate in the height and horizontal directions;

[0007] The method comprises the following steps:

[0008] S1. One end of the memory alloy wire is fixedly wound on the active winding wheel, and the other end is sequentially passed through the V-shaped directional wheel 1, the opening hole of the material box, the opening hole of the orifice plate, the purple light, and the V-shaped directional wheel 2, and finally fixed on the passive winding wheel; the height and horizontal direction of the opening hole of the orifice plate are adjusted by adjusting the adjusting screw 1 and the adjusting screw 2;

[0009] S2, turn on the UV lamp and start the motor; driven by the motor, the memory alloy wire is pulled horizontally at a uniform speed;

[0010] S3. When the memory alloy wire passes through the material box, the outside is coated with a viscoelastic polymer; then the memory alloy wire coated with the viscoelastic polymer passes through the orifice plate, and excess coating material is scraped off; finally, the memory alloy wire coated with the viscoelastic polymer passes through an ultraviolet lamp, and the viscoelastic polymer is cured to obtain a shape memory alloy-viscoelastic polymer coaxial filament.

[0011] Furthermore, the composition, properties, diameter and other parameters of the memory alloy wire can be selected as needed, the viscoelastic polymer can be photocured, and the rheological properties are adjustable. After the viscoelastic polymer is wrapped around the memory alloy wire, it can basically maintain its original shape in less than 1 second and can be basically cured in less than 3 seconds.

[0012] Furthermore, the damping force of the passive wire wheel of the damper is adjustable, and the tension of the memory alloy wire can be regulated by adjusting the damping force.

[0013] Furthermore, the speed of the motor is adjustable, and the light curing time and light curing degree of the viscoelastic polymer can be controlled by controlling the speed of the motor.

[0014] Furthermore, the loading amount of the viscoelastic polymer in the material box exceeds the opening hole height of the material box and the opening hole height of the orifice plate.

[0015] Furthermore, the sizes of the opening holes of the material box and the orifice plate are adjustable, the ratio of the viscoelastic polymer layer thickness to the memory alloy wire diameter can be adjusted by the diameter of the opening hole, and the opening hole diameter of the material box ≥ the opening hole diameter of the orifice plate ≥ the diameter of the memory alloy wire.

[0016] Furthermore, the UV lamp includes a UV frame and a UV head, and the UV frame is used to support and fix the UV head. The UV lamp should be placed as close to the material box and the orifice plate as possible, and the wavelength and light intensity of the UV lamp are selected according to the light curing characteristics of the viscoelastic polymer.

[0017] A shape memory alloy-viscoelastic polymer coaxial filament is manufactured using the manufacturing method described above.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] Compared with the prior art, the manufacturing method of the present invention has a simple process, saves materials and has a low manufacturing cost. The eccentricity of the coaxial filament can be precisely adjusted by controlling the position of the orifice plate, and the layer thickness of the attached polymer can be adjusted by replacing the diameter of the orifice plate. The composition structure and proportion of the coaxial filament can be conveniently changed as needed, thereby expanding the structural design and functional customization space of shape memory alloy-viscoelastic polymer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the device in the present invention.

[0021] Figure 2 It is a schematic structural diagram of the active winding wheel in the present invention.

[0022] Figure 3 It is a schematic diagram of the structure of the damper in the present invention.

[0023] Figure 4 It is a schematic diagram of the structure of the material box in the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of the orifice plate in the present invention.

[0025] Figure 6 It is a schematic diagram of the structure of the UV light frame in the present invention.

[0026] Figure 7 Schematic diagrams of the cross-sections of concentric and eccentric shape memory alloy-viscoelastic polymers in the present invention; (a) is a concentric shape memory alloy-viscoelastic polymer, and (b) is an eccentric shape memory alloy-viscoelastic polymer.

[0027] In the figure: active winding wheel 1-1, passive winding wheel 1-2, damper 2, V-shaped directional wheel 1 3-1, V-shaped directional wheel 2 3-2, material box 4, orifice plate 5, UV frame 6, motor 7, adjusting screw 1 8-1, adjusting screw 2 8-2, memory alloy wire 9, UV head 10, viscoelastic polymer 11. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0030] One embodiment of the present invention provides a method for manufacturing an adjustable eccentric shape memory alloy-viscoelastic polymer coaxial filament, the method is based on a device ( Figure 1 to Figure 7 ), the device includes an active winding wheel 1-1, a passive winding wheel 1-2, a damper 2, a V-shaped directional wheel 3-1, a V-shaped directional wheel 3-2, a material box 4, a hole plate 5, an ultraviolet lamp, a motor 7, an adjusting screw 8-1 and an adjusting screw 8-2, a memory alloy wire 9 and a viscoelastic polymer 11; a V-shaped directional wheel 3-1, a material box 4, a hole plate 5, an ultraviolet lamp and a V-shaped directional wheel 3-2 are arranged from left to right between the active winding wheel 1-1 and the passive winding wheel 1-2; opening holes are provided on the material box 4 and the hole plate 5, the material box 4 is used to load the viscoelastic polymer 11, and the adjusting screw 8-1 and the adjusting screw 8-2 are used to adjust the opening hole of the hole plate 5 in the height and horizontal directions. The ultraviolet lamp includes an ultraviolet light frame 6 and an ultraviolet light head 10, and the ultraviolet light frame 6 is used to support and fix the ultraviolet light head 10.

[0031] The method comprises the following steps:

[0032] S1, the two ends of the memory alloy wire 9 are fixedly wound on the active winding wheel 1-1 and the passive winding wheel 1-2 on the left and right sides respectively, and the V-shaped directional wheel 1 3-1 and the V-shaped directional wheel 2 3-2 on the left and right sides straighten the memory alloy wire 9 and keep it horizontal, and the memory alloy wire 9 passes through the material box 4 and the orifice plate 5 loaded with the viscoelastic polymer 11.

[0033] The damping force of the active winding wheel 1-1 and the passive winding wheel 1-2 is adjustable, and the tension of the memory alloy wire 9 can be adjusted by adjusting the damping force; the V-shaped directional wheel 1 3-1 and the V-shaped directional wheel 2 3-2 must be kept horizontal; the loading amount of the viscoelastic polymer 11 in the material box 4 should exceed the height of the opening hole of the material box 4 and the opening hole of the orifice plate 5, and the freedom of the opening hole of the orifice plate 5 in the height and horizontal directions is respectively adjusted by the adjusting screw 1 8-1 and the adjusting screw 2 8-2, so that the eccentricity of the coaxial filament in the cross-sectional direction can be adjusted; the size of the opening hole of the material box 4 and the orifice plate 5 is adjustable, and the ratio of the thickness of the viscoelastic polymer 11 layer to the diameter of the memory alloy wire 9 can be adjusted by the diameter of the opening hole, and the diameter of the opening hole of the material box 4 ≥ the diameter of the opening hole of the orifice plate 5 ≥ the diameter of the memory alloy wire 9.

[0034] S2, starting the motor 7. Driven by the motor 7, the memory alloy wire 9 is pulled horizontally at a uniform speed, and the viscoelastic polymer 11 is evenly wrapped in the length direction of the memory alloy wire 9.

[0035] The speed of the motor 7 is adjustable, and the light curing time and light curing degree of the viscoelastic polymer 11 can be controlled by controlling the speed of the motor 7 .

[0036] S3. Place an ultraviolet lamp between the orifice plate 5 and the right V-shaped directional wheel 3-2 to solidify the viscoelastic polymer 11 to obtain shape memory alloy-viscoelastic polymer coaxial filaments, and wind the coaxial filaments through the motor 7 and collect them on the right winding wheel 1-2.

[0037] The placement position of the ultraviolet lamp should be as close as possible to the material box 4 and the orifice plate 5 , and the wavelength and light intensity of the ultraviolet lamp are selected according to the light curing characteristics of the viscoelastic polymer 11 .

[0038] An embodiment of the present invention provides a shape memory alloy-viscoelastic polymer coaxial filament prepared by the above preparation method. The coaxial filament is made of the following materials: shape memory alloy filament, viscoelastic polymer 11, rheology regulator and silane coupling agent.

[0039] Among them, the memory alloy wire 9 can be a nickel-titanium-based shape memory alloy (Ni-Ti SMA), a copper-based shape memory alloy (CuSMA), an iron-based shape memory alloy (Fe SMA), etc., and the ratio between the components and the diameter of the memory alloy wire 9 are adjustable; the viscoelastic polymer 11 can be an acrylic polymer, silicone rubber, liquid crystal elastomer, PDMS and other polymers with viscoelastic properties, and a silane coupling agent is used to increase the interface connection between the memory alloy wire and the polymer. Its rheological properties can be adjusted by adjusting the ratio of the diluent and the cross-linking agent and adding a rheology regulator, and it can basically maintain its original state within less than 1 second. Its photocuring properties can be adjusted by adjusting the type and ratio of the photoinitiator, and it can be basically cured within less than 3 seconds.

[0040] Embodiment 1: This embodiment provides a method for manufacturing an adjustable eccentric shape memory alloy-viscoelastic polymer coaxial filament, comprising the following steps:

[0041] 1a. Select a material box 4 opening hole diameter of 2mm and a hole plate 5 opening hole diameter of 1mm, select a nickel-titanium-based shape memory alloy (Ni-Ti, 55:45) with a diameter of 0.4mm and fix it on the active winding wheel 1-1, and the other end passes through the V-shaped directional wheel 1-1, the material box 4, the hole plate 5, the purple light, the V-shaped directional wheel 2-2 in sequence, and is fixed on the passive winding wheel 1-2, and the eccentricity x of the coaxial filament is 0.1mm and y is 0.3mm by adjusting the screw 2 8-2 and the adjusting screw 1 8-1;

[0042] 2a. Prepare an acrylic acid-based polymer, and adjust its rheological properties and photocuring properties by adjusting the ratio of the diluent and the cross-linking agent and the content of the photoinitiator, so that its shape can remain basically unchanged within 1 second, and the thickness of 1 mm can be basically cured within 3 seconds; pour the acrylic acid-based polymer into the material box 4, and the material height must exceed the height of the opening hole of the orifice plate 5 and the height of the opening hole of the material box 4.

[0043] 3a. Turn on the UV lamp and adjust the UV lamp to a light intensity of 6,000uW / cm 2 , the irradiation length is 100~3000nm, turn on motor 7, and adjust the speed of motor 7 to 2mm / s; motor 7 drives the coaxial filament to move slowly from left to right, infiltrate, wrap, and solidify, and collect and wind the coaxial filament onto the passive winding wheel 1-2.

[0044] 4a. If the diameter of the polymer, memory alloy wire 9 or orifice plate 5 needs to be changed, the nickel-titanium-based shape memory alloy needs to be removed, the material box 4 needs to be cleaned and the material needs to be replaced, and a new orifice plate 5 with a different opening hole diameter needs to be replaced. After the replacement, the above 1a~3a processes need to be repeated.

[0045] The preparation methods of Examples 2 to 8 are similar to those of Example 1, and the differences are shown in Table 1.

[0046] Table 1 Preparation methods of Examples 2 to 8

[0047] Example Parameter changes relative to Example 1 Corresponding technical adjustments 2 The diameter of the shape memory alloy filament is 0.8mm The diameters of the material box 4 and the orifice plate 5 must be increased accordingly 3 The eccentricity of the coaxial filament is 0.2 mm for x and 0.4 mm for y Adjustment screw 2 8-2 and adjustment screw 1 8-1 must be readjusted. 4 <![CDATA[The ultraviolet light intensity is 4,000 uW / cm 2 > Motor 7 speed must be reduced or polymer photoinitiator content and viscosity must be increased 5 The irradiation length of UV lamp is 500nm Motor 7 speed must be reduced or polymer photoinitiator content and viscosity must be increased 6 The speed of motor 7 is 5 mm / s The UV light intensity and polymer photoinitiator content can be increased, and the polymer viscosity can be appropriately reduced. 7 The polymer is a liquid crystal elastomer material Process parameters must be adjusted appropriately, and the performance and function of coaxial filaments will change 8 Shape memory alloy is iron-based shape memory alloy Changes in coaxial filament properties and functions

[0048] The above are only preferred embodiments of the present invention. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These should also be regarded as the protection scope of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A method for manufacturing a shape memory alloy-viscoelastic polymer coaxial filament, characterized in that: The method is based on a device, which includes an active winding wheel, a passive winding wheel, a damper, a V-shaped directional wheel 1, a V-shaped directional wheel 2, a material box, a hole plate, an ultraviolet lamp, a motor, an adjustment screw 1 and an adjustment screw 2, a memory alloy wire and a viscoelastic polymer; the V-shaped directional wheel 1, the material box, the hole plate, the ultraviolet lamp and the V-shaped directional wheel 2 are arranged in sequence from left to right between the active winding wheel and the passive winding wheel; the material box and the hole plate are both provided with opening holes, the material box is used to load the viscoelastic polymer, and the adjustment screw 1 and the adjustment screw 2 are used to adjust the freedom of the opening hole of the hole plate in the height and horizontal directions; The method comprises the following steps: S1. Fix one end of the memory alloy wire on the active winding wheel, and pass the other end through the V-shaped directional wheel 1, the opening hole of the material box, the opening hole of the orifice plate, the purple light, and the V-shaped directional wheel 2 in sequence, and finally fix it on the passive winding wheel; adjust the opening hole of the orifice plate in height and horizontal directions by adjusting the adjusting screw 1 and the adjusting screw 2; S2, turn on the UV lamp and start the motor; driven by the motor, the memory alloy wire is pulled horizontally at a uniform speed; S3. When the memory alloy wire passes through the material box, the outside is coated with a viscoelastic polymer; then the memory alloy wire coated with the viscoelastic polymer passes through the orifice plate, and excess coating material is scraped off; finally, the memory alloy wire coated with the viscoelastic polymer passes through an ultraviolet lamp, and the viscoelastic polymer is cured to obtain a shape memory alloy-viscoelastic polymer coaxial filament.

2. The method for manufacturing the shape memory alloy-viscoelastic polymer coaxial filament according to claim 1, characterized in that: After wrapping the memory alloy wire, the viscoelastic polymer keeps its original shape within less than 1 second and is solidified within less than 3 seconds.

3. The method for manufacturing the shape memory alloy-viscoelastic polymer coaxial filament according to claim 1, characterized in that: The tension of the memory alloy wire is adjusted by adjusting the damping force of the passive wire wheel of the damper.

4. The method for manufacturing the shape memory alloy-viscoelastic polymer coaxial filament according to claim 1, characterized in that: The light curing time and light curing degree of the viscoelastic polymer can be controlled by controlling the speed of the motor.

5. The method for manufacturing the shape memory alloy-viscoelastic polymer coaxial filament according to claim 1, characterized in that: The loading amount of the viscoelastic polymer in the material box exceeds the opening hole height of the material box and the opening hole height of the orifice plate.

6. The method for manufacturing the shape memory alloy-viscoelastic polymer coaxial filament according to claim 1, characterized in that: The diameter of the opening hole of the material box is greater than or equal to the diameter of the opening hole of the orifice plate and greater than the diameter of the memory alloy wire.

7. The method for manufacturing the shape memory alloy-viscoelastic polymer coaxial filament according to claim 1, characterized in that: The ultraviolet lamp comprises an ultraviolet light frame and an ultraviolet light head, and the ultraviolet light frame is used for supporting and fixing the ultraviolet light head.

8. A shape memory alloy-viscoelastic polymer coaxial filament, characterized in that: The shape memory alloy-viscoelastic polymer coaxial filament is manufactured using the manufacturing method described in any one of claims 1 to 7.

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