CN116536816A - Heat-insulating strain sensing yarn and preparation method and application thereof - Google Patents
Heat-insulating strain sensing yarn and preparation method and application thereof Download PDFInfo
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- CN116536816A CN116536816A CN202310421791.4A CN202310421791A CN116536816A CN 116536816 A CN116536816 A CN 116536816A CN 202310421791 A CN202310421791 A CN 202310421791A CN 116536816 A CN116536816 A CN 116536816A
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Classifications
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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
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/447—Yarns or threads for specific use in general industrial applications, e.g. as filters or reinforcement
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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
- D02G3/02—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
-
- 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
- D02G3/26—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre with characteristics dependent on the amount or direction of twist
- D02G3/28—Doubled, plied, or cabled threads
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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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- 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
- D02G3/38—Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn
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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
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/441—Yarns or threads with antistatic, conductive or radiation-shielding properties
-
- 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
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/443—Heat-resistant, fireproof or flame-retardant yarns or threads
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
- D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
- D04C1/02—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof made from particular materials
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
- D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
- D04C1/06—Braid or lace serving particular purposes
- D04C1/12—Cords, lines, or tows
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- D10B2101/00—Inorganic fibres
- D10B2101/02—Inorganic fibres based on oxides or oxide ceramics, e.g. silicates
- D10B2101/08—Ceramic
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2101/00—Inorganic fibres
- D10B2101/10—Inorganic fibres based on non-oxides other than metals
- D10B2101/12—Carbon; Pitch
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
- D10B2201/20—Cellulose-derived artificial fibres
- D10B2201/22—Cellulose-derived artificial fibres made from cellulose solutions
- D10B2201/24—Viscose
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/10—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyurethanes
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/14—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polycondensates of cyclic compounds, e.g. polyimides, polybenzimidazoles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
The invention relates to a heat-insulating strain sensing yarn and a preparation method and application thereof, and belongs to the technical field of intelligent textiles. The preparation method of the heat-insulating strain sensing yarn comprises the following steps of S1, weaving conductive yarns on the surface of elastic yarns to obtain elastic conductive composite yarns; the elastic yarn keeps a natural stretching state in the knitting process; s2, coating heat-insulating fibers on the surface of the elastic conductive composite yarn in a friction spinning mode to obtain the heat-insulating strain sensing yarn, wherein the elastic conductive composite yarn is kept in a natural stretching state in the coating process. The middle layer and the outer layer of the heat-insulating strain sensing yarn are respectively composed of the conductive yarn and the heat-insulating fiber, so that the heat-insulating strain sensing yarn has good sensing performance, is endowed with good heat-insulating performance, and still has higher sensitivity and stability after multiple stretching recovery.
Description
Technical Field
The invention belongs to the technical field of intelligent textiles, and particularly relates to a heat-insulating strain sensing yarn and a preparation method and application thereof.
Background
With the development of information technology and the pursuit of people on quality life, research of intelligent sensors is receiving a great deal of attention, and the integration of intelligent sensing devices into traditional textiles to prepare intelligent wearable textiles is becoming a research hotspot. Early smart wearable textiles mostly combined sensing devices with fabrics by coating, embedding, packaging and the like, and the whole is rigid and heavy. In the later stage, with the development of new materials and new technologies, the functional textiles are prepared by silk screen printing, vapor deposition, ink jet printing and other methods, and the comfort and weight of the functional textiles are improved, but the functional layer structure is easily damaged by external force, and the problem is well improved by the proposal of functional yarns, so that the functional textiles are good in flexibility and endowed with additional functions.
Chinese patent CN115323514A adds a plurality of hollow structures and aerogel nano particles in the skin layer and the core layer to prepare the heat insulation composite yarn so as to reduce the heat conductivity of the yarn and play a role in heat insulation, but lacks of sensing and monitoring the motion state of a human body.
For the heat insulation and sensing effects, the article research discovers that the functional yarn researched aiming at the high-temperature environment at present has single functions, and can integrate the heat insulation function and the sensing function into the same yarn rarely, and ensures the stability of the yarn.
Disclosure of Invention
In order to solve the technical problems, the invention provides a heat-insulating strain sensing yarn and a preparation method and application thereof. And weaving conductive yarns on the outer layer of spandex, and wrapping polyimide fibers on the outer layer of the conductive yarns by friction spinning to prepare the composite sensing yarn with the heat insulation function, so that the composite sensing yarn can better cope with a high-temperature environment.
A first object of the present invention is to provide a method for preparing an insulating strain sensing yarn, comprising the steps of,
s1, weaving conductive yarns on the surfaces of elastic yarns to obtain elastic conductive composite yarns; the elastic yarn keeps a natural stretching state in the knitting process;
s2, coating heat-insulating fibers on the surface of the elastic conductive composite yarn in the S1 in a friction spinning mode to obtain the heat-insulating strain sensing yarn, wherein the elastic conductive composite yarn is kept in a natural stretching state in the coating process.
In one embodiment of the present invention, the natural stretch state refers to maintaining the intermediate elastic yarn in an original stretched state under proper tension, because the elastic yarn has good elasticity, and excessive stretching can cause the intermediate elastic yarn to be always longer than its original length during spinning, which can lead to a great compromise in the elasticity of the final manufactured thermally insulating strain sensing yarn.
In one embodiment of the present invention, in step (1), the elastic yarn is selected from one or more of spandex, polyester high stretch yarn, and nylon high stretch yarn.
In one embodiment of the present invention, in step (1), the conductive yarn is selected from one or more of silver-plated nylon yarn, silver-plated flame-retardant viscose yarn, carbon nanotube flame-retardant viscose yarn, coated graphene yarn, silver-plated polyester yarn, and metal nanowire.
In one embodiment of the invention, in step (1), the braiding is performed on a high-speed braiding machine, wherein the braiding speed is 15rpm-25rpm, the export speed is 4m/min-6m/min, and the winding speed is 5m/min-7m/min; the conductive yarn had an ingot count of 8, 10, 12, 14 or 16.
In one embodiment of the present invention, in step (2), the heat insulating fiber is selected from one or more of polyimide, polysulfonamide fiber, and ceramic fiber.
In one embodiment of the present invention, in the step (2), the process parameters of the friction spinning are: the yarn feeding speed is 2m/min-4m/min, the output speed is 2m/min-4m/min, and the winding speed is 3m/min-5m/min.
A second object of the present invention is to provide an insulated strain sensing yarn prepared by the method.
A third object of the present invention is to provide a yarn prepared from the thermally insulating strain sensing yarn.
A fourth object of the present invention is to provide a fabric prepared from the strands; the twist of the strand is 5T, 10T or 15T. It should be noted that the larger the twist, the better the sensing performance, the twist value is limited by the upper limit, and a certain gap is kept between the two twisted yarns, so that when an external force is applied to the strands, the strands can still recover their original state after strain sensing.
A fifth object of the present invention is to provide the use of said fabric for motion monitoring, thermal insulation.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) According to the heat-insulating strain sensing yarn, the conductive yarn is woven outside the elastic yarn, and the obtained elastic conductive composite yarn forms a sheath-core structure. In the structure, the elastic yarns of the core layer are in an original long and straight state, so that raw materials are saved, and meanwhile, the elasticity of the whole elastic yarns can be fully displayed; the skin layer is fully wrapped by the conductive yarn, and the elastic composite yarn of the core layer has elasticity, so that the prepared elastic conductive composite yarn can generate strain induction no matter being stretched by external force or pressed by external force, and the conductive yarn has large effective contact area and better strain sensing performance.
(2) The heat-insulating strain sensing yarn takes elastic yarn as core yarn, and an outer layer is woven with conductive yarn to prepare elastic conductive composite yarn which is used as a sensing layer; and the heat-insulating fiber is coated outside the elastic conductive composite yarn by friction spinning technology to prepare the heat-insulating strain sensing yarn, so that the preparation process is short, the process is simple, the production cost is low, and the quantitative production can be realized.
(3) The heat-insulating strain sensing yarn is prepared by two spinning processes of braiding and friction spinning, each process involves forming a wrapping structure by two yarns through reverse rotation, and because the thickness of the yarns is not negligible, gaps exist, namely, each spinning process generates a gap, more gaps are generated in the two spinning processes than in the pure heat-insulating fiber, and the gaps between the skin layer and the core layer in the skin-core structure are added, so that the heat-insulating strain sensing yarn has excellent heat-insulating performance.
(4) The middle layer and the outer layer of the heat-insulating strain sensing yarn are respectively composed of the conductive yarn and the heat-insulating fiber, so that the heat-insulating strain sensing yarn has good sensing performance, is endowed with good heat-insulating performance, and still has higher sensitivity and stability after multiple stretching recovery.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:
FIG. 1 is a flow chart of the preparation of a polyimide thermal insulation strain sensing yarn of the present invention;
FIG. 2 is a graph showing the relative capacitance change of polyimide insulating strain sensing yarn strands of test example 1 of the present invention when stretched to 50%;
FIG. 3 is a graph showing the stability of 15T polyimide thermal insulation strain sensing yarns of test example 2 of the present invention at various tensile recoveries;
fig. 4 shows the insulation properties of the cotton fabric, polyimide fabric and the prepared insulation fabric of test example 3 according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
Referring to fig. 1, a thermal insulation strain sensing yarn, a preparation method and application thereof specifically comprise the following steps:
(1) Preparation of elastic conductive composite yarn: the method comprises the steps of selecting silver-plated nylon yarns as conductive yarns, selecting the number of the conductive yarns to be 12, rewinding the conductive yarns onto bobbins, respectively inserting the conductive yarns into inner and outer layer travelling horses of a braiding machine according to corresponding positions, passing the conductive yarns through the travelling horses, penetrating out from yarn guide holes, merging all the conductive yarns, penetrating out a spandex elastic yarn warp yarn tensioner in a natural straightening state from a circular hole in the center of a braiding machine disc, winding the spandex elastic yarn warp yarn tensioner and the conductive yarns onto a traction disc in a 8 shape, guiding out from a compression roller at a speed of 5m/min, and winding the spandex elastic yarn warp yarn tensioner onto a bobbin at a speed of 6 m/min. The knitting speed is set to be 20r/min, the knitting machine is started, and the inner spindle and the outer spindle drive the conductive yarn to respectively perform plane circular motion and sinusoidal circular motion in different directions around the spandex elastic yarn along the grooves, so that the conductive yarn is mutually staggered and knitted on the outer layer of the spandex core yarn to form the elastic conductive composite yarn.
(2) Preparation of polyimide heat-insulating strain sensing yarns: the elastic conductive composite yarn in a natural straightening state passes through a dust cage to be wound on a bobbin, then polyimide yarn is fed into a drafting device through a yarn guide roller at a speed of 3m/min, is split into single fibers through a licker-in, is conveyed to the surface of the dust cage through air flow, and the fibers are adsorbed and condensed on the surface of the dust cage to form ribbon fiber strands. The two dust cages are mutually pressed and rotated in the same direction, so that friction is generated between the fiber strips and the surfaces of the dust cages, the fiber strips and the surfaces of the dust cages are twisted in a rolling way along with the surfaces of the dust cages around the conductive yarn/spandex composite yarn to form the composite yarn, the composite yarn is output to form yarn at the speed of 3m/min, and finally the conductive yarn/spandex/polyimide composite yarn is wound into bobbin yarn at the speed of 4m/min through a winding device to prepare the polyimide heat-insulation strain sensing yarn.
Test example 1
Polyimide thermal insulation strain sensing yarns of different twists (5T, 10T, 15T) were tested for relative capacitance change under the same tension based on example 1, which test procedure was: 6 sections of polyimide heat-insulation strain sensing yarns with the length of about 12cm are respectively sheared, every two sections are in one group, the three groups of yarns are respectively twisted by 5T, 10T and 15T of twist, the twisting process mainly comprises the steps of twisting the two yarns in each group by ring spinning at the spindle speed of 4300r/min under the driving of a ring and a wire ring which do circular motion, and the polyimide heat-insulation strain sensing yarn strands with different twist degrees are prepared. And then sequentially connecting the prepared 5T, 10T and 15T polyimide heat-insulating strain sensing yarn strands with a capacitance testing device, stretching to the same extent, and recording the relative capacitance change of the polyimide heat-insulating strain sensing yarn under different twists, wherein the result is shown in figure 2. As can be seen from fig. 2, when the twist of the polyimide thermal insulation strain sensing yarn strand is 5T and 10T, the corresponding relative capacitance changes are about 15% and 32%, respectively, and when the twist of the polyimide thermal insulation strain sensing yarn strand is increased to 15T, the relative capacitance changes are maximum and can reach 45%, so that it can be seen that the polyimide thermal insulation strain sensing yarn strand has good strain sensing performance. The polyimide heat-insulating strain sensing yarn strand is obtained by twisting and winding two polyimide heat-insulating strain sensing yarns through ring spinning, when the twisting twist is 15T, the two polyimide heat-insulating strain sensing yarns are more tightly crossed and wound, so that even if the two polyimide heat-insulating strain sensing yarns are stretched or pressed by smaller external force, the two polyimide heat-insulating strain sensing yarns can realize larger-area contact under a compact structure, the external force range of strain sensing is larger, and the generated strain sensing signal is larger, so that the 15T polyimide heat-insulating strain sensing yarn strand has the best sensing performance.
Test example 2
To test the stability of the polyimide thermal insulation strain sensing yarn, based on the polyimide thermal insulation strain sensing yarn strand with the optimal strain sensing performance and 15T twist in test example 1, 12cm was cut therefrom, and after being connected to a capacitance test device, it was subjected to 1000 stretch-recovery cycles and the capacitance change was recorded, and the result is shown in fig. 3. As can be seen from fig. 3, the capacitance value of the 15T polyimide thermal insulation strain sensing yarn remained relatively stable throughout the 1000 stretch recovery movements. Therefore, the polyimide heat-insulating strain sensing yarn has better stability. When the twist of the polyimide heat-insulating strain sensing yarn strand is 15T, two polyimide heat-insulating strain sensing yarns which are in cross winding are combined more tightly, the yarn tension is larger, and when the two heat-insulating strain sensing yarns with larger tension are mutually wound, the movement between the two heat-insulating strain sensing yarns can be mutually limited. When the polyimide heat-insulating strain sensing yarn strand is stretched by external force and deformed, the tension of the two polyimide heat-insulating strain sensing yarns is increased, and at the moment, the mutual drag between the two heat-insulating strain sensing yarns is also enhanced until the polyimide heat-insulating strain sensing yarn strand returns to its original state after the external force is released. In the whole process, the movement between the two polyimide heat-insulating strain sensing yarns constituting the polyimide heat-insulating strain sensing yarn strand is limited by each other, and when the twist is 15T, the mutual drag is enhanced, so that the stability of the strand can be well maintained.
Test example 3
In order to verify the heat insulation performance of the polyimide heat insulation strain sensing yarn fabric, firstly, polyimide yarns are used as warp yarns, 15T polyimide heat insulation strain sensing yarn strands are used as weft yarns, and the polyimide heat insulation strain sensing yarn strand woven fabric is manufactured through interweaving the warp yarns and the weft yarns. Then, the temperature of the heating plate was adjusted to 37 ℃ which is normal body temperature of human body to replace human skin, and the heating plate was sequentially contacted with cotton fabric, polyimide fabric and polyimide heat-insulating strain sensing yarn fabric having the same gram weight, and the surface temperatures of the three fabrics were respectively tested by thermocouples, and the results are shown in fig. 4. As can be seen from fig. 4, at the same contact temperature, the temperature of the polyimide insulating strain sensing yarn fabric surface was about 32.5 ℃ which is significantly lower than the temperature of the cotton fabric and polyimide fabric surfaces. The reason is that the rigid aromatic structure in the polyimide fiber molecular main chain endows the polyimide fiber with high thermal resistance, and when the elastic conductive composite yarn is used for friction spinning of a layer of polyimide fiber, partial air exists in the middle, so that external heat can be further isolated. It can be seen that the polyimide thermal insulation strain sensing yarn fabric has excellent thermal insulation performance.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. A preparation method of heat-insulating strain sensing yarn is characterized by comprising the following steps,
s1, weaving conductive yarns on the surfaces of elastic yarns to obtain elastic conductive composite yarns; the elastic yarn keeps a natural stretching state in the knitting process;
s2, coating heat-insulating fibers on the surface of the elastic conductive composite yarn in the S1 in a friction spinning mode to obtain the heat-insulating strain sensing yarn, wherein the elastic conductive composite yarn is kept in a natural stretching state in the coating process.
2. The method of producing an insulated strain sensing yarn according to claim 1, wherein in step (1), the elastic yarn is selected from one or more of spandex, polyester high-stretch yarn, and nylon high-stretch yarn.
3. The method of claim 1, wherein in step (1), the conductive yarn is selected from one or more of silver-plated nylon yarn, silver-plated flame-retardant viscose yarn, carbon nanotube flame-retardant viscose yarn, coated graphene yarn, silver-plated polyester yarn, and metal nanowire.
4. The method of producing a thermal insulation strain sensing yarn according to claim 1, wherein in step (1), the braiding is performed on a high-speed braiding machine, the braiding speed during braiding is 15rpm-25rpm, the export speed is 4m/min-6m/min, and the winding speed is 5m/min-7m/min; the conductive yarn had an ingot count of 8, 10, 12, 14 or 16.
5. The method of producing an insulated strain sensing yarn according to claim 1, wherein in step (2), the insulating fiber is selected from one or more of polyimide, polysulfonamide fiber and ceramic fiber.
6. The method of claim 1, wherein in step (2), the process parameters of the friction spinning are: the yarn feeding speed is 2m/min-4m/min, the output speed is 2m/min-4m/min, and the winding speed is 3m/min-5m/min.
7. An insulated strain sensing yarn made by the method of any one of claims 1-6.
8. A strand, wherein the strand is made from the thermally insulating strain sensing yarn of claim 7.
9. A fabric prepared from the strands of claim 8; the twist of the strand is 5T, 10T or 15T.
10. Use of the fabric of claim 9 for motion monitoring, insulation.
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