CN110387621A - Stretchable elastic conductive wire harness at room temperature and its preparation method and application - Google Patents
Stretchable elastic conductive wire harness at room temperature and its preparation method and application Download PDFInfo
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- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
- D02G3/04—Blended or other yarns or threads containing components made from different materials
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/32—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic
- D02G3/328—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic containing elastane
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- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
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- D06M11/05—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with hydrogen, water or heavy water; with hydrides of metals or complexes thereof; with boranes, diboranes, silanes, disilanes, phosphines, diphosphines, stibines, distibines, arsines, or diarsines or complexes thereof with water, e.g. steam; with heavy water
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Abstract
Description
技术领域technical field
本发明涉及一种室温下可拉伸弹性导电线束及其制备方法，特别是涉及一种基于弹性形状记忆聚合物的室温下可拉伸弹性导电线束及其制备方法及应用。The invention relates to a stretchable elastic conductive wire bundle at room temperature and a preparation method thereof, in particular to a room temperature stretchable elastic conductive wire bundle based on an elastic shape memory polymer, a preparation method and application thereof.
背景技术Background technique
柔性导电织物技术的发展使新一代与人体接触的电子设备成为可能，例如抗静电纺织品、屏蔽电磁波纺织品、可记录人体温度、排汗量、心跳等数据的智能服装、防侦察伪装材料等。The development of flexible conductive fabric technology has made it possible for a new generation of electronic devices that come into contact with the human body, such as antistatic textiles, electromagnetic wave shielding textiles, smart clothing that can record data such as body temperature, perspiration, and heartbeat, and anti-reconnaissance camouflage materials.
目前所报道的柔性导电织物(CN106448849B、CN107209617A、CN108109715A、CN207070592U)，主要结构虽然也是由导电线材和弹性线材(或柔性线材)直接编织而成，但织物总体的伸缩变形能力有限、变形后不能定型、容易被拉扯及摩擦等外力破坏、以及制作过程较为复杂并且应用领域有限。Currently reported flexible conductive fabric (CN106448849B, CN107209617A, CN108109715A, CN207070592U), although the main structure is also directly woven by conductive wire rod and elastic wire rod (or flexible wire rod), the overall stretching and deformation ability of the fabric is limited, and it cannot be finalized after deformation. , easy to be damaged by external forces such as pulling and friction, and the production process is relatively complicated and the application field is limited.
发明内容Contents of the invention
针对现有技术中存在的上述问题，本专利技术提供一种具有室温下可拉伸弹性导电线束及其制备方法，通过该制备方法得到一种室温可拉伸弹性导电线束，该导电线束是由室温下为弹性的形状记忆聚合物丝经预拉伸变形后与导电丝编织而成，制成的导电线束可弹性拉伸且在拉伸过程中其导电性能稳定，从而实现了可拉伸弹性导电布的制备。Aiming at the above-mentioned problems existing in the prior art, this patent technology provides a stretchable elastic conductive wire bundle at room temperature and its preparation method. Through the preparation method, a room temperature stretchable elastic conductive wire bundle is obtained. The conductive wire bundle is made of The shape memory polymer filaments that are elastic at room temperature are pre-stretched and deformed and then woven with conductive filaments. The conductive wire bundles made can be elastically stretched and their conductivity is stable during stretching, thus achieving stretchable elasticity. Preparation of conductive cloth.
本发明是通过如下技术方案得以实现的：The present invention is achieved through the following technical solutions:
一种室温下可拉伸弹性导电线束，该可拉伸弹性导电线束包括具有形状记忆效应且在室温下为弹性的聚合物丝和导电丝；所述具有形状记忆效应且在室温下为弹性的聚合物丝经预拉伸变形后和所述导电丝编织，对预拉伸变形后的聚合物丝施加激励使其形状恢复从而得到可拉伸弹性导电束。A stretchable elastic conductive wire bundle at room temperature, the stretchable elastic conductive wire bundle includes polymer filaments and conductive filaments that have a shape memory effect and are elastic at room temperature; The polymer filaments are pre-stretched and deformed and braided with the conductive filaments, and excitation is applied to the pre-stretched and deformed polymer filaments to restore their shape so as to obtain stretchable elastic conductive bundles.
优选的，所述可拉伸弹性导电束包括一根或数根预拉伸变形后的具有形状记忆效应的弹性聚合物丝和一根或者数根导电丝通过气流纺或者喷气纺或者涡流纺或者赛络纺或者紧密纺编织而成。Preferably, the stretchable elastic conductive bundle comprises one or several pre-stretched and deformed elastic polymer filaments with shape memory effect and one or several conductive filaments by air-spinning or air-jet spinning or vortex spinning or Siro spinning or compact spinning.
一种室温下可拉伸弹性导电线束的制备方法，包括如下步骤：对具有形状记忆效应且室温下为弹性的聚合物丝进行预拉伸变形，预拉伸变形后与导电丝进行编织，得到可拉伸弹性导电线束；施加激励于预拉伸变形后的具有形状记忆效应且室温下为弹性的聚合物丝使得变形恢复从而得到失稳成波浪状的弹性导电线束。A method for preparing a stretchable elastic conductive wire bundle at room temperature, comprising the following steps: performing pre-stretch deformation on a polymer wire having a shape memory effect and being elastic at room temperature, and weaving with the conductive wire after the pre-stretch deformation to obtain Stretchable elastic conductive wire bundle: Excitement is applied to the pre-stretched deformed polymer filament with shape memory effect and elastic at room temperature to make the deformation recover so as to obtain the elastic conductive wire bundle destabilized into a wavy shape.
优选的，所述可拉伸弹性导电线束可编织成具有形状记忆功能并可单向或双向拉伸的弹性导电布。Preferably, the stretchable elastic conductive wire bundle can be woven into an elastic conductive cloth with shape memory function and can be stretched in one direction or in two directions.
优选的，施加激励驱动预拉伸变形后的具有形状记忆效应且室温下为弹性的聚合物丝的过程可在编织导电布之前或之后进行。Preferably, the process of applying excitation to drive the pre-stretched and deformed polymer filament with shape memory effect and elastic at room temperature can be performed before or after weaving the conductive cloth.
优选的，所述施加激励的激励方式为温度变化或者浸泡溶液或者置于气氛中的一种或多种；所述浸泡溶液或者置于气氛中包括水或者酒精或者丙酮等的溶液或者相应气氛；所述形状记忆弹性聚合物丝在溶液中浸泡后，形状恢复且变软而弹性性能增强。Preferably, the excitation method for applying the excitation is one or more of temperature change or soaking solution or placing in the atmosphere; the soaking solution or placing in the atmosphere includes a solution including water or alcohol or acetone or the corresponding atmosphere; After the shape-memory elastic polymer filament is soaked in the solution, the shape recovers and becomes soft and the elastic performance is enhanced.
优选的，所述具有形状记忆且室温下为弹性的聚合物为热固型或者热塑型。Preferably, the polymer having shape memory and being elastic at room temperature is thermosetting or thermoplastic.
优选的，所述形状记忆弹性聚合物丝的拉伸预变形可在室温下拉伸定型或者加热到形状记忆弹性聚合物的软化温度以上进行拉伸，再经冷却到室温后定型；或者在浸泡溶液或置于气氛后拉伸，再干燥后定型。Preferably, the stretching pre-deformation of the shape-memory elastic polymer filament can be stretched at room temperature or heated above the softening temperature of the shape-memory elastic polymer for stretching, and then set after cooling to room temperature; or after soaking Stretch after solution or in the atmosphere, then dry and set.
优选的，所述预拉伸变形的变形率为5％～300％。Preferably, the deformation rate of the pre-stretching deformation is 5%-300%.
一种室温下可拉伸弹性导电线束的应用，可拉伸弹性导电束外无绝缘层时，制备得到的导电布可作为电子触屏。An application of a stretchable elastic conductive wire bundle at room temperature. When there is no insulating layer outside the stretchable elastic conductive bundle, the prepared conductive cloth can be used as an electronic touch screen.
本发明与现有技术相比，具有如下优点效果：Compared with the prior art, the present invention has the following advantages and effects:
1.本发明所述的制备室温下可拉伸弹性导电线束的方法与传统的纺线工艺匹配，不需要将聚合物在外力作用下保持拉伸状态时与导电丝编织。1. The method for preparing stretchable elastic conductive wire bundles at room temperature according to the present invention matches the traditional spinning process, and does not need to weave the polymer with the conductive wire while maintaining the stretched state under the action of external force.
2.按本发明方法制成的可拉伸弹性导电线束在3％～150％的拉伸变形下，导电丝不会受损，且其导电性能不变。2. The stretchable elastic conductive wire harness made by the method of the present invention will not be damaged under the tensile deformation of 3% to 150%, and its conductive performance will not change.
3.按发明方法制成的室温下可拉伸弹性导电线束可用传统工艺编织成可单向或双向拉伸的弹性布。3. The stretchable elastic conductive wire harness at room temperature made by the method of the invention can be woven into an elastic cloth that can be stretched in one direction or two directions by traditional techniques.
4.本发明所述的室温下可拉伸弹性导电线束和用其编织成的布具有形状记忆效应，可以反复地贴合人体局部的形貌。4. The stretchable elastic conductive wire harness at room temperature of the present invention and the cloth woven from it have a shape memory effect, and can repeatedly conform to the local shape of the human body.
5.本发明制备的导电线束具有导电功能、高弹性和形状记忆效应，该导电线束用来制备弹性形状记忆导电布，使得所制备的导电布不仅具有导电性，而且在全程保持高弹性的前提下可发生拉伸变形并可定形、并在一定激励方式作用下变形可恢复。5. The conductive wire bundle prepared by the present invention has conductive function, high elasticity and shape memory effect. The conductive wire bundle is used to prepare elastic shape memory conductive cloth, so that the prepared conductive cloth not only has conductivity, but also maintains high elasticity throughout the process. It can be stretched and deformed under certain conditions, and can be set, and the deformation can be restored under a certain excitation method.
具体实施方式Detailed ways
为对本发明做进一步的了解，结合具体实施例对本发明做进一步的说明：For further understanding of the present invention, the present invention will be further described in conjunction with specific examples:
本发明提供一种室温下可拉伸弹性导电线束及其制备方法，所述可拉伸弹性导电线束由一根或多根具有形状记忆效应且室温下为弹性的聚合物丝经预拉伸变形后和一根或多根导电丝编织，再经施加激励驱动形状记忆弹性聚合物丝形状恢复而造成导电丝失稳成波浪状；所述可拉伸弹性导电线束可编织成具有形状记忆功能的并可单向或双向拉伸的弹性导电布；施加激励驱动预拉伸过的聚合物丝使其恢复形状的过程可以在编织导电布之前或之后进行。The invention provides a stretchable elastic conductive wire bundle at room temperature and a preparation method thereof. The stretchable elastic conductive wire bundle is pre-stretched and deformed by one or more polymer filaments having a shape memory effect and being elastic at room temperature Afterwards, it is braided with one or more conductive wires, and then the shape memory elastic polymer wire is driven to restore its shape by applying an excitation to cause the conductive wire to become unsteady into a wave shape; the stretchable elastic conductive wire bundle can be woven into a shape memory It is an elastic conductive fabric that can be stretched in one direction or two directions; the process of applying excitation to drive the pre-stretched polymer filament to restore its shape can be carried out before or after weaving the conductive fabric.
所述的一种室温下可拉伸弹性导电线束及其制备方法，是将具有形状记忆且在室温下为弹性的聚合物丝预拉伸变形后，施加特定激励使其变形恢复；The stretchable elastic conductive wire harness at room temperature and its preparation method are: after pre-stretching and deforming polymer filaments with shape memory and being elastic at room temperature, applying specific excitation to restore the deformation;
所述驱动形状记忆弹性聚合物丝形状恢复所施加的激励方式为温度变化、浸泡溶液或置于气氛(比如水，酒精，丙酮的溶液或相应的气氛)中的一种或多种；所述形状记忆弹性聚合物丝在特定溶剂中浸泡后，形状恢复且变软而弹性性能增强。The excitation mode applied to drive the shape recovery of the shape memory elastic polymer filament is one or more of temperature change, soaking solution or placing in the atmosphere (such as water, alcohol, acetone solution or corresponding atmosphere); the After the shape memory elastic polymer filament is soaked in a specific solvent, its shape recovers and becomes soft and its elastic properties are enhanced.
所述具有形状记忆且室温下为弹性的聚合物为热固或者热塑型的。The polymer having shape memory and being elastic at room temperature is thermosetting or thermoplastic.
所述形状记忆弹性聚合物丝的拉伸预变形可以是在室温下拉伸定型；也可以是加热到形状记忆弹性聚合物的软化温度(比如玻璃化转变或熔融转变温度)以上进行拉伸，再经冷却到室温后定型；也可以在浸泡溶液或置于气氛后拉伸，再干燥后定型。The stretching pre-deformation of the shape-memory elastic polymer filament can be stretched at room temperature; it can also be stretched above the softening temperature (such as glass transition or melting transition temperature) of the shape-memory elastic polymer, After cooling to room temperature, it can be set; it can also be stretched after soaking in the solution or placed in the atmosphere, and then dried to set the shape.
所述形状记忆弹性聚合物丝的拉伸预变形的变形率为5％～300％。The stretching pre-deformation deformation rate of the shape memory elastic polymer filament is 5%-300%.
所述可拉伸弹性导电束由一根或多根预拉伸变形后的具有形状记忆效应的弹性聚合物丝和一根或多根导电丝通过气流纺、喷气纺、涡流纺、赛络纺、紧密纺等方法编织而成。The stretchable elastic conductive bundle is composed of one or more pre-stretched and deformed elastic polymer filaments with shape memory effect and one or more conductive filaments through air spinning, air jet spinning, vortex spinning, siro spinning , compact spinning and other methods of weaving.
所述导电丝有外包绝缘层。The conductive thread is covered with an insulating layer.
所述导电丝无外包绝缘层时，相应导电布可以用作电子触屏。When the conductive thread has no outer insulating layer, the corresponding conductive cloth can be used as an electronic touch screen.
所述导电布基于可拉伸弹性导电束的形状记忆效应，可实现针对某一特定形状的贴合塑形，并在施加特定激励后形状恢复；此贴合塑形及形状恢复过程可重复进行。Based on the shape memory effect of stretchable elastic conductive bundles, the conductive cloth can be fitted to a specific shape, and the shape can be restored after a specific excitation is applied; the process of fitting and shaping and shape recovery can be repeated .
实施例1：一种室温下可拉伸弹性导电线束及其制备方法：将0.1毫米直径的形状记忆聚氨酯丝(其玻璃化转变温度在60℃)在室温下进行拉伸预变形处理(拉伸至100％再卸载)，将其与0.1毫米直径的漆包铜丝线编织成导电线束；使用此导电线束编织成布。将布浸泡在乙醇或水里使聚氨酯丝的玻璃化转变温度降至室温以下导致形状恢复且成为高弹性丝，而铜丝失稳成波浪状，制成双向可弹性拉伸的导电布。制成的布，单向或双向拉伸80％，铜丝不会受损，导电性能不变。Example 1: A stretchable elastic conductive wire bundle at room temperature and its preparation method: the shape memory polyurethane wire with a diameter of 0.1 mm (its glass transition temperature is at 60° C.) is subjected to stretching pre-deformation treatment (stretching) at room temperature To 100% and then unload), weave it with 0.1 mm diameter enamelled copper wire to form a conductive wire bundle; use this conductive wire bundle to weave into cloth. Soaking the cloth in ethanol or water lowers the glass transition temperature of the polyurethane wire to below room temperature, causing the shape to recover and become a highly elastic wire, while the copper wire is destabilized into a wavy shape, making a two-way elastically stretchable conductive cloth. Made of cloth, stretched 80% in one direction or two directions, the copper wire will not be damaged, and the conductivity will not change.
实施例2：一种室温下可拉伸弹性导电线束及其制备方法：将0.08毫米直径的弹性形状记忆聚氨酯丝在室温下进行拉伸预变形处理，比如拉伸至300％再卸载，将三股预拉过的聚氨酯丝与两股0.05毫米直径的碳纤维丝编织成导电线束；加热使聚氨酯丝形状恢复而导致碳纤维失稳成波浪状；使用此导电线束编织成双向可拉伸弹性导电布。制成的导电布，可弹性单向或双向拉伸50％，碳纤维丝不会受损，导电性能不变。Example 2: A stretchable elastic conductive wire harness at room temperature and its preparation method: stretch and pre-deform elastic shape-memory polyurethane wires with a diameter of 0.08 mm at room temperature, such as stretching to 300% before unloading, and three strands Pre-stretched polyurethane filaments are woven with two 0.05 mm diameter carbon fiber filaments to form a conductive wire bundle; heating restores the shape of the polyurethane wire and causes the carbon fiber to become unsteady and wavy; use this conductive wire bundle to weave into a two-way stretchable elastic conductive cloth. The conductive fabric made can be stretched 50% elastically in one or two directions, the carbon fiber filaments will not be damaged, and the conductivity will not change.
实施例3：一种室温下可拉伸弹性导电线束及其制备方法：将0.05毫米直径的弹性形状记忆聚氨酯丝在80℃下软化后进行拉伸预变形处理，比如拉伸至45％，冷却后卸载，将其与0.05毫米直径的铜丝编织成导电线束，用此导电线束编织成布后加热到80℃成为双向可拉伸弹性导电布。制成的布，单向或双向拉伸40％，铜丝不会受损，导电性能不变。加热到80℃后，可以将此布覆盖到需要包裹的物体或其局部，冷却后布可以保持被包裹部位的形状。再次加热到80℃后，布恢复原来形状。此导电布可作为形状记忆弹性电子触屏。Example 3: A Stretchable Elastic Conductive Wire Harness at Room Temperature and Its Preparation Method: Soften the elastic shape-memory polyurethane wire with a diameter of 0.05 mm at 80° C. and perform stretching pre-deformation treatment, such as stretching to 45%, and cooling After unloading, it is braided with copper wires with a diameter of 0.05 mm to form a conductive wire bundle, which is then heated to 80° C. to become a bidirectional stretchable elastic conductive cloth. Made of cloth, stretched 40% in one direction or two directions, the copper wire will not be damaged, and the conductivity will not change. After heating to 80°C, the cloth can be covered on the object to be wrapped or its part, and the cloth can keep the shape of the wrapped part after cooling. After heating to 80°C again, the cloth returned to its original shape. The conductive cloth can be used as a shape memory elastic electronic touch screen.
实施例4：一种室温下可拉伸弹性导电线束及其制备方法：将0.03毫米直径的弹性形状记忆聚酯纤维在90℃软化后拉伸50％，降至室温后松开约束，并将其与一股0.05毫米直径的铝线纺成束；再次加热至90℃后，聚酯纤维收缩，导致铝线失稳弯曲成波浪状，成为可拉伸40％的弹性导电线束。在一个方向上使用此导电线束编织成可在此方向弹性拉伸变形并导电的布。Example 4: A stretchable elastic conductive wire bundle at room temperature and its preparation method: Stretch an elastic shape memory polyester fiber with a diameter of 0.03 mm at 90°C for 50% after softening, release the restraint after cooling down to room temperature, and It is spun into a bundle with a 0.05 mm diameter aluminum wire; after heating to 90°C again, the polyester fiber shrinks, causing the aluminum wire to become unstable and bend into waves, becoming an elastic conductive wire bundle that can be stretched by 40%. Use this conductive wire bundle in one direction to weave into a cloth that can be elastically stretched and deformed in this direction and conduct electricity.
实施例5：一种室温下可拉伸弹性导电线束及其制备方法：将0.1毫米的热塑橡胶纤维丝加热到100℃使其软化后拉伸150％，冷却后去除约束，再将三股预拉过的热塑橡胶纤维丝与三股碳纤维束纺成导电线束；使用此导电线束编织成仅可在一个方向发生弹性变形的导电布，并浸泡在丙酮中使热塑橡胶纤维丝发生形状恢复，取出后丙酮挥发，可拉伸弹性导电布制备完成。Example 5: A stretchable elastic conductive wire bundle at room temperature and its preparation method: heat 0.1mm thermoplastic rubber fiber filaments to 100°C to soften them and stretch them by 150%, remove the restraint after cooling, and then three strands of pre- The stretched thermoplastic rubber fiber filament and three carbon fiber bundles are spun into a conductive wire bundle; the conductive wire bundle is used to weave a conductive cloth that can only be elastically deformed in one direction, and soaked in acetone to restore the shape of the thermoplastic rubber fiber filament, After taking it out, the acetone volatilizes, and the stretchable elastic conductive cloth is prepared.
实施例6：一种室温下可拉伸弹性导电线束及其制备方法：将0.1毫米直径的热塑性弹性体纤维丝在高温下软化后拉伸70％，再将五根预拉后的热塑性弹性体纤维丝与五根0.05毫米直径的填充了碳纳米管的PBO纤维(聚对苯撑苯并二噁唑纤维)制成的纤维丝编成导电线束；用此导电线束编织成仅可在一个方向导电的布。加热后热塑性弹性体纤维丝形状恢复，在导电方向上，布可弹性拉伸而导电性能不变。Example 6: A stretchable elastic conductive wire bundle at room temperature and its preparation method: Stretch 0.1 mm-diameter thermoplastic elastomer fiber filaments by 70% after being softened at high temperature, and then five pre-stretched thermoplastic elastomer filaments The fiber filaments and five fiber filaments made of PBO fibers (poly-p-phenylene benzobisoxazole fibers) filled with carbon nanotubes with a diameter of 0.05 mm are braided into conductive wire bundles; with this conductive wire bundle, weaving can only be carried out in one direction. Conductive cloth. After heating, the shape of the thermoplastic elastomer filaments recovers, and the cloth can be elastically stretched in the direction of conduction while the conduction performance remains unchanged.
实施例7：一种室温下可拉伸弹性导电线束及其制备方法：将0.01毫米直径的热固性弹性体纤维丝加热到60℃使其软化后拉伸150％，待冷却硬化后移除约束。将三股预拉后的热固性弹性体纤维丝与三股0.01直径的碳纤维丝编织成导电线束；使用此导电线束编织成可在二个方向伸缩变形的导电布；加热使热固性弹性体纤维丝形状恢复后，获得可双向弹性拉伸变形的导电布。将此形状记忆弹性导电布加热60℃使其软化后在其冷却到人体温度附近时贴合到人体膝盖或手腕上，待其塑形后成为与膝盖或手腕完全贴合且可以通电发热的弹性布。加热到60℃后布可恢复原状，这一贴合过程可以重复。Example 7: A Stretchable Elastic Conductive Wire Bundle at Room Temperature and Its Preparation Method: Heat a 0.01mm-diameter thermosetting elastomer fiber filament to 60°C to soften it and then stretch it by 150%. After cooling and hardening, the constraint is removed. Weave three strands of pre-stretched thermosetting elastomer fiber filaments and three strands of 0.01 diameter carbon fiber filaments into a conductive wire bundle; use this conductive wire bundle to weave into a conductive cloth that can be stretched and deformed in two directions; heat the thermosetting elastomer fiber filaments to restore their shape , to obtain a conductive fabric that can be elastically stretched and deformed in both directions. Heat this shape memory elastic conductive cloth at 60°C to soften it, and when it cools down to the temperature of the human body, it will be attached to the knee or wrist of the human body. cloth. After heating to 60°C, the cloth can return to its original shape, and this bonding process can be repeated.
所述实施例为本发明的优选的实施方式，但本发明并不限于上述实施方式，在不背离本发明的实质内容的情况下，本领域技术人员能够做出的任何显而易见的改进、替换或变型均属于本发明的保护范围。The described embodiment is a preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation, without departing from the essence of the present invention, any obvious improvement, replacement or modification that those skilled in the art can make Modifications all belong to the protection scope of the present invention.
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