In-plane knitted-knitted hybrid fabric structure and memory material preparation and deformation method

Abstract

The invention relates to an in-plane knitting-knitting hybrid fabric structure, which comprises two groups of knitting coil structures formed by knitting two yarns respectively, when the in-plane knitted-knitted hybrid fabric structure is applied, the in-plane knitted-knitted hybrid fabric structure is firstly made into a shape memory material, and the shape memory material has the advantage of large deformation quantity due to the knitted coil structures; the shape memory material has the advantage of high strength due to the yarn interwoven structure, the yarn interwoven structure is formed by obliquely weaving at 45 degrees, and transverse and longitudinal pulling spaces are provided, so that the memory material is high in deformability, and the tensile restoring force is larger than that in the prior art. Therefore, according to the design, the deformation capacity is large, and the stretching restoring force is high.

Description

Technical Field

[0001] The present invention relates to an in-plane knitted-woven hybrid fabric structure, belongs to the field of intelligent deformation composite materials, and in particular to an in-plane knitted-woven hybrid fabric structure and a preparation and deformation method of a memory material. Background Art

[0002] Memory material is a kind of intelligent responsive material, which means that a product with an initial shape can be programmed into a temporary shape under certain stimulation conditions (such as heat, electricity, light, chemical solvents, etc.), and can return to its original shape again through the stimulation of external conditions.

[0003] A Chinese patent with application number 202222740944.5 and application date October 18, 2022 discloses a stretch-recoverable continuous fiber-reinforced shape memory composite material structure, including: a knitted fabric reinforcement and a shape memory polymer coating, wherein the knitted fabric reinforcement is wrapped in the middle of the shape memory polymer coating, the knitted fabric reinforcement is a sheet-like knitted structure, and the shape memory polymer coating fills the gap inside the knitted fabric reinforcement. At the same time, the shape memory polymer coating is wrapped on the upper and lower surfaces of the knitted fabric reinforcement. In this design, a knitted fabric reinforcement is used to enhance the recoverability of the shape memory composite material, but the deformation amount of the knitted fabric is large, which makes the memory material relatively loose, so the deformation ability of the memory material is small and the tensile recovery force is low. Therefore, there is still a need to further improve the deformation ability and tensile recovery force of the memory material.

[0004] The information disclosed in this background technology section is only intended to increase understanding of the overall background of the application and should not be considered as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects and problems in the prior art that the deformation ability and tensile recovery force still need to be improved, and to provide an in-plane knitted-woven hybrid fabric structure with large deformation ability and high tensile recovery force and a preparation and deformation method of a memory material.

[0006] To achieve the above objectives, the technical solution of the present invention is:

[0007] An in-plane knitted-woven hybrid fabric structure includes two groups of knitted coil structures knitted by two yarns respectively, and the adjacent coils of the two groups of knitted coil structures are interlaced and woven to form a yarn interwoven structure to obtain the in-plane knitted-woven hybrid fabric structure.

[0008] The two sets of knitted loop structures are knitted by a first yarn and a second yarn, respectively. The first yarn includes a plurality of loops of a first trunk, a first rear extension line, a first rising line, a first top line, a first descending line, and a first front extension line; the second yarn includes a plurality of loops of a second trunk, a second rear extension line, a second rising line, a second top line, a second descending line, and a second front extension line.

[0009] The first front extension line, the first loop stem and the first rear extension line are connected in sequence, one end of the first rear extension line is connected to one end of the first rising line, the first rising line is located in the mutually woven structure of yarns, the middle portion of the first rising line and the middle portions of multiple second descending lines are interwoven up and down in sequence, the height difference between the top of the first rising line and the bottom of the first rising line is the height of the two first loop stems, the other end of the first rising line is connected to one end of the first top line, the first top line is located between the two second loop stems, the other end of the first top line is connected to one end of the first descending line, the first descending line is located in the mutually woven structure of yarns, the middle portion of the first descending line and the middle portions of multiple second rising lines are interwoven up and down in sequence, the height difference between the top of the first descending line and the bottom of the first descending line is the height of the two first loop stems, and the other end of the first descending line is connected to one end of the first front extension line;

[0010] The second front extension line, the second loop stem and the second rear extension line are connected in sequence, one end of the second rear extension line is connected to one end of the second rising line, the second rising line is located in the yarn weaving structure, the middle part of the second rising line and the middle parts of multiple first descending lines are interwoven up and down in sequence, the height difference between the top of the second rising line and the bottom of the second rising line is the height of two second loop stems, the other end of the second rising line is connected to one end of the second top line, the second top line is located between the two first loop stems, the other end of the second top line is connected to one end of the second descending line, the second descending line is located in the yarn weaving structure, the middle part of the second descending line and the middle parts of multiple first rising lines are interwoven up and down in sequence, the height difference between the top of the second descending line and the bottom of the second descending line is the height of two second loop stems, and the other end of the second descending line is connected to one end of the second front extension line.

[0011] The first top line is located below the top of a second loop stem, and the first top line is located above one end of the second loop stem connected to the second loop stem, close to the second rear extension line and the second front extension line;

[0012] The second top line is located below the top of a first loop stem, and the second top line is located above one end of the first loop stem connected to the first loop stem, close to the first rear extension line and the first front extension line.

[0013] The first ascending line is located below the end of the first second descending line close to the first ring stem, the first ascending line is located above the middle of the second second descending line, and the first ascending line is located below the end of the third second descending line close to the second front extension line;

[0014] The second rising line is located below the end of the first first descending line close to the second circle stem, the second rising line is located above the middle of the second first descending line, and the second rising line is located below the end of the third first descending line close to the first front extension line.

[0015] The first yarn is woven from aramid fiber, glass fiber, polyester fiber, basalt fiber, carbon fiber, polyimide fiber, spandex fiber, hemp fiber or cotton fiber;

[0016] The second yarn is made of aramid fiber, glass fiber, polyester fiber, basalt fiber, carbon fiber, polyimide fiber, spandex fiber, hemp fiber or cotton fiber.

[0017] A method for preparing a memory material using an in-plane knitted-woven hybrid fabric structure, the method comprising the following steps:

[0018] Step 1: First, use the knitting-weaving technology to weave the in-plane knitted-weaved hybrid fabric structure skeleton;

[0019] Step 2: first, place the in-plane knitted-woven hybrid fabric structure skeleton in the middle of the metal mold plate, then fix the in-plane knitted-woven hybrid fabric structure skeleton, then place metal height limit plates on both sides of the in-plane knitted-woven hybrid fabric structure skeleton, then cover the metal mold plate on the metal mold, then form a vacuum negative pressure environment in the metal mold and the metal mold plate, then inject the shape memory polymer into the metal mold, and then the shape memory polymer gradually fills the interior of the in-plane knitted-woven hybrid fabric skeleton, and the shape memory polymer covers the surface of the in-plane knitted-woven hybrid fabric structure skeleton;

[0020] Step 3: Place the metal mold in an oven, allow the oven to reach a specified temperature, wait for a specified time, then take the metal mold out of the oven to cool, and then take out the shape memory composite material. At this time, the shape memory composite material is solidified and formed to obtain a memory material.

[0021] In the second step, the vacuum negative pressure environment is a vacuum negative pressure environment of 0.01 to 0.1 MPa; in the third step, the designated temperature is 80 to 280° C., and the designated time is 1 to 10 hours.

[0022] The material comprises an in-plane knitted-woven hybrid fabric structure skeleton and a shape memory polymer, wherein the shape memory polymer wraps and fills the in-plane knitted-woven hybrid fabric structure skeleton.

[0023] The shape memory polymer is a shape memory epoxy resin, shape memory styrene, shape memory polyurethane, shape memory polyimide or shape memory cyanate polymer material.

[0024] A deformation method for preparing a memory material using an in-plane knitted-woven hybrid fabric structure, the method comprising the following steps:

[0025] Step 1: First, connect the surface of the rigid memory material to the heating sheet of the expansion and deformation device so that the longitudinal axis of the memory material is parallel, and then fix the center of the memory material to the positioner in the middle of the axis;

[0026] Step 2: First, power the motor, and then the motor powers the heating sheet to increase the temperature of the heating sheet. At this time, the heating sheet gradually heats the memory material to above the transition temperature, and the memory material becomes flexible. Then, the motor is used to rotate the main shaft axially. At this time, the memory material is wound on the main shaft with the help of the auxiliary rod;

[0027] Step 3: First stop the power supply to the motor. At this time, the heating sheet is powered off, and the temperature of the heating sheet and the memory material gradually drops. After the memory material cools down, it can maintain the winding state.

[0028] Step 4: This step is performed when the memory material needs to be unfolded: first, power is supplied to the motor, and then the motor powers the heating sheet to increase the temperature of the heating sheet. At this time, the heating sheet gradually heats the memory material to above the transition temperature. At this time, the memory material uses the strain energy stored during deformation to restore the initial configuration and achieve fixation.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. In the preparation and deformation method of an in-plane knitted-woven hybrid fabric structure and a memory material of the present invention, the in-plane knitted-woven hybrid fabric structure includes two groups of knitted coil structures knitted by a first yarn and a second yarn respectively, and the adjacent coils of the two groups of knitted coil structures are interlaced and woven to form a yarn interwoven structure, and the yarn interwoven structure is woven at a 45-degree angle. When used, the in-plane knitted-woven hybrid fabric structure is prepared as a memory material. Because the structure has a knitted coil structure, it has the advantage of a large knitted coil structure deformation. Because the knitted coil structure is connected to the yarn interwoven structure, The invention has the advantage of high yarn braiding strength, and the interwoven yarn structure is connected to the knitted coil structure at a 45-degree angle, providing space for the memory material to be pulled horizontally or vertically. Therefore, the memory material has excellent deformation ability in the horizontal and vertical directions, and its tensile recovery force is stronger than that of the existing technology. When it is wound and deformed, the winding angle is larger than that of the existing technology, which can reduce the space required for winding. At the same time, the mixed structure formed by the knitted coil structure and the interwoven yarn structure forms a multi-level damage inhibition mechanism within the material. When the material is impacted or pressurized, the interaction between different fibers can absorb energy and reduce the spread of damage. Therefore, the invention has a large deformation ability and a high tensile recovery force.

[0031] 2. In the preparation and deformation method of an in-plane knitted-woven hybrid fabric structure and memory material of the present invention, the preparation method of the memory material includes: first making an in-plane knitted-woven hybrid fabric structure skeleton, then covering the inner and outer surfaces of the in-plane knitted-woven hybrid fabric structure skeleton with a shape memory polymer, and then heating and cooling to obtain the memory material. The in-plane knitted-woven hybrid fabric structure skeleton with a high tensile recovery force is used, so the tensile recovery force of the memory material is effectively enhanced. The shape memory polymer gives the composite material excellent shape memory performance, shape memory deformation ability and strength, and the memory material is integrally formed, without the need for secondary processing, and the production process is simple. Therefore, the memory strength of the present invention is relatively high.

[0032] 3. The present invention relates to a method for preparing and deforming an in-plane knitted-woven hybrid fabric structure and a memory material. The deformation method comprises: first fixing the memory material to a heating sheet, then heating the memory material with the heating sheet, and simultaneously winding the memory material around a main shaft via an auxiliary rod. Then, heating the memory material is stopped, and the memory material maintains the wound state after cooling. When the memory material needs to be unfolded, the memory material is heated by the heating sheet, and the memory material returns to its original configuration. The memory material can be wound at a large angle, thus forming a good match with the winding and fixing method of the memory material. Moreover, the wound memory material has a large area after unfolding, and the unfolding process is relatively smooth, making it suitable for use in the field of spacecraft. Therefore, the present invention has a good unfolding effect.

[0033] 4. In the present invention, a method for preparing and deforming an in-plane knitted-woven hybrid fabric structure and memory material, wherein the first and second yarns are made of aramid fibers, a room-temperature mechanical property test of the in-plane knitted-woven hybrid fabric structure made of aramid fibers revealed a transverse tensile strain at break of 386% and a longitudinal tensile strain at break of 849%. Furthermore, a U-bend shape memory performance test at a bending radius of 7.5 mm revealed a shape retention rate of 98%, a shape recovery rate of 97%, and a recovery force of up to 0.7 N. Subsequently, an unfolding deformation test revealed good unfolding performance. Therefore, the present invention exhibits high shape retention and shape recovery rates. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is the front view of the present invention.

[0035] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure viewed from the left.

[0036] Figure 3 yes Figure 1 Schematic diagram of the structure of the knitted loop structure.

[0037] Figure 4 yes Figure 1 Schematic diagram of the structure of the first yarn.

[0038] Figure 5 yes Figure 1 Top view of .

[0039] Figure 6 Schematic diagram of the structure of the memory material in Example 2.

[0040] Figure 7 It is a structural schematic diagram of the unfolding deformation device in Example 2.

[0041] In the figure: in-plane knitted-woven hybrid fabric structure skeleton 1, knitted coil structure 11, weft knitted coil 111, yarn mutual weaving structure 12, first yarn 2, first loop stem 21, first rear extension line 22, first rising line 23, first top line 24, first descending line 25, first front extension line 26, second yarn 3, second loop stem 31, second rear extension line 32, second rising line 33, second top line 34, second descending line 35, second front extension line 36, unfolding deformation device 4, heating sheet 41, main shaft 42, positioner 43, auxiliary rod 44, motor 45, shape memory polymer 5, memory material 6. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] See Figure 1 — Figure 7 , an in-plane knitted-woven hybrid fabric structure, the in-plane knitted-woven hybrid fabric structure includes two groups of knitted coil structures 11 knitted by two yarns respectively, and the adjacent coils of the two groups of knitted coil structures 11 are interlaced and woven to form a yarn mutual woven structure 12 to obtain the in-plane knitted-woven hybrid fabric structure.

[0044] The two sets of knitted loop structures 11 are knitted by a first yarn 2 and a second yarn 3, respectively. The first yarn 2 includes a plurality of loops of a first trunk 21, a first rear extension line 22, a first ascending line 23, a first top line 24, a first descending line 25, and a first front extension line 26; the second yarn 3 includes a plurality of loops of a second trunk 31, a second rear extension line 32, a second ascending line 33, a second top line 34, a second descending line 35, and a second front extension line 36.

[0045] The first front extension line 26, the first loop stem 21 and the first rear extension line 22 are connected in sequence, one end of the first rear extension line 22 is connected to one end of the first rising line 23, the first rising line 23 is located in the yarn interwoven structure 12, the middle part of the first rising line 23 and the middle parts of the plurality of second descending lines 35 are interwoven in sequence, the height difference between the top of the first rising line 23 and the bottom of the first rising line 23 is the height of the two first loop stems 21, the other end of the first rising line 23 is connected to one end of the first top line 24, the first top line 24 is located between the two second loop stems 31, the other end of the first top line 24 is connected to one end of the first descending line 25, the first descending line 25 is located in the yarn interwoven structure 12, the middle part of the first descending line 25 and the middle parts of the plurality of second rising lines 33 are interwoven in sequence, the height difference between the top of the first descending line 25 and the bottom of the first descending line 25 is the height of the two first loop stems 21, and the other end of the first descending line 25 is connected to one end of the first front extension line 26;

[0046] The second front extension line 36, the second loop stem 31 and the second rear extension line 32 are connected in sequence, one end of the second rear extension line 32 is connected to one end of the second rising line 33, the second rising line 33 is located in the yarn interwoven structure 12, the middle part of the second rising line 33 and the middle parts of multiple first descending lines 25 are interwoven up and down in sequence, the height difference between the top of the second rising line 33 and the bottom of the second rising line 33 is the height of the two second loop stems 31, the other end of the second rising line 33 is connected to one end of the second top line 34, the second top line 34 is located between the two first loop stems 21, the other end of the second top line 34 is connected to one end of the second descending line 35, the second descending line 35 is located in the yarn interwoven structure 12, the middle part of the second descending line 35 and the middle parts of multiple first rising lines 23 are interwoven up and down in sequence, the height difference between the top of the second descending line 35 and the bottom of the second descending line 35 is the height of the two second loop stems 31, and the other end of the second descending line 35 is connected to one end of the second front extension line 36.

[0047] The first top line 24 is located below the top of a second loop stem 31. The first top line 24 is located above one end of the second loop stem 31 connected to the second loop stem 31, which is close to the second rear extension line 32 and the second front extension line 36.

[0048] The second top line 34 is located below the top of a first ring stem 21 , and the second top line 34 is located above one end of the first ring stem 21 connected to the first ring stem 21 close to the first rear extension line 22 and the first front extension line 26 .

[0049] The first ascending line 23 is located below the end of the first second descending line 35 close to the first loop 21, the first ascending line 23 is located above the middle of the second second descending line 35, and the first ascending line 23 is located below the end of the third second descending line 35 close to the second front extension line 36;

[0050] The second rising line 33 is located below one end of the first first descending line 25 close to the second ring stem 31, the second rising line 33 is located above the middle of the second first descending line 25, and the second rising line 33 is located below one end of the third first descending line 25 close to the first front extension line 26.

[0051] The first yarn 2 is woven from aramid fiber, glass fiber, polyester fiber, basalt fiber, carbon fiber, polyimide fiber, spandex fiber, hemp fiber or cotton fiber;

[0052] The second yarn 3 is made of aramid fiber, glass fiber, polyester fiber, basalt fiber, carbon fiber, polyimide fiber, spandex fiber, hemp fiber or cotton fiber.

[0053] A method for preparing a memory material using an in-plane knitted-woven hybrid fabric structure, the method comprising the following steps:

[0054] Step 1: First, use the knitting-weaving technology to weave an in-plane knitted-weaved hybrid fabric structure skeleton 1;

[0055] Step 2: first place the in-plane knitted-woven hybrid fabric structure skeleton 1 in the middle part of the metal mold plate, then fix the in-plane knitted-woven hybrid fabric structure skeleton 1, then place metal height limit plates on both sides of the in-plane knitted-woven hybrid fabric structure skeleton 1, then cover the metal mold plate on the metal mold, and then form a vacuum negative pressure environment in the metal mold and the metal mold plate, and then inject the shape memory polymer 5 into the metal mold, and then the shape memory polymer 5 gradually fills the interior of the in-plane knitted-woven hybrid fabric skeleton 1, and the shape memory polymer 5 covers the surface of the in-plane knitted-woven hybrid fabric structure skeleton 1;

[0056] Step 3: Place the metal mold in an oven, allow the oven to reach a specified temperature, wait for a specified time, then remove the metal mold from the oven to cool, and then remove the shape memory composite material. At this time, the shape memory composite material is solidified and formed to obtain memory material 6.

[0057] In the second step, the vacuum negative pressure environment is a vacuum negative pressure environment of 0.01 to 0.1 MPa; in the third step, the designated temperature is 80 to 280° C., and the designated time is 1 to 10 hours.

[0058] A shape memory material based on an in-plane knitted-woven hybrid fabric skeleton structure, the material comprising an in-plane knitted-woven hybrid fabric structure skeleton 1 and a shape memory polymer 5, wherein the shape memory polymer 5 wraps and fills the in-plane knitted-woven hybrid fabric structure skeleton 1.

[0059] The shape memory polymer 5 is a shape memory epoxy resin, shape memory styrene, shape memory polyurethane, shape memory polyimide or shape memory cyanate ester polymer material.

[0060] A deformation method for preparing a memory material using an in-plane knitted-woven hybrid fabric structure, the method comprising the following steps:

[0061] Step 1: First, connect the surface of the rigid memory material 6 to the heating sheet 41 of the expansion and deformation device 4, so that the longitudinal axis 42 of the memory material 6 is parallel, and then fix the center of the memory material 6 to the positioner 43 in the middle of the axis 42;

[0062] Step 2: First, power is supplied to the motor, which then supplies power to the heating sheet 41 to increase the temperature of the heating sheet 41. At this time, the heating sheet 41 gradually heats the memory material 6 to above the transition temperature, and the memory material 6 becomes flexible. Then, the motor 45 causes the main shaft 42 to rotate axially. At this time, the memory material 6 is wound around the main shaft 42 with the assistance of the auxiliary rod 44.

[0063] Step 3: First, stop the power supply to the motor. At this time, the heating sheet 41 is powered off, and the temperature of the heating sheet 41 and the memory material 6 gradually decreases. After the memory material 6 cools down, it can maintain the winding state;

[0064] Step 4: This step is performed when the memory material 6 needs to be unfolded: first, the motor 45 is powered, and then the motor 45 powers the heating sheet 41 to increase the temperature of the heating sheet 41. At this time, the heating sheet 41 gradually heats the memory material 6 to above the transition temperature. At this time, the memory material 6 uses the strain energy stored during deformation to restore the initial configuration and achieve fixation.

[0065] The supplementary description of the present invention is as follows:

[0066] The memory material 6 of the present invention is: a shape memory composite material.

[0067] Example 1:

[0068] See Figure 1 — Figure 7, an in-plane knitted-woven hybrid fabric structure, the in-plane knitted-woven hybrid fabric structure includes two groups of knitted coil structures 11 knitted by two yarns respectively, and the adjacent coils of the two groups of knitted coil structures 11 are interlaced and woven to form a yarn mutual weaving structure 12 to obtain an in-plane knitted-woven hybrid fabric structure. The two groups of knitted coil structures 11 are knitted by a first yarn 2 and a second yarn 3 respectively, the first yarn 2 includes a plurality of loops of a first loop stem 21, a first rear extension line 22, a first rising line 23, a first top line 24, a first descending line 25 and a first front extension line 26; the second yarn 3 includes a plurality of loops of a second loop stem 31, a second rear extension line 32, a second rising line 33, a second top line 34, a second descending line 35 and a second front extension line 36; the first front extension line 26, the first loop stem 21 and the first rear extension line 22 are connected in sequence, and one end of the first rear extension line 22 is connected to one end of the first rising line 23. The first rising line 23 is located in the yarn interwoven structure 12, and the middle part of the first rising line 23 is interwoven with the middle parts of the plurality of second descending lines 35 in sequence. The height difference between the top of the first rising line 23 and the bottom of the first rising line 23 is the height of the two first loop stems 21. The other end of the first rising line 23 is connected to one end of the first top line 24, and the first top line 24 is located between the two second loop stems 31. The other end of the first top line 24 is connected to one end of the first descending line 25. The first descending line 25 is located in the yarn interwoven structure 12, and the middle part of the first descending line 25 is interwoven with the plurality of second rising lines 3 The middle part of the yarn woven structure 12 is interwoven up and down in sequence, and the height difference between the top of the first descending line 25 and the bottom of the first descending line 25 is the height of the two first loop stems 21, and the other end of the first descending line 25 is connected to one end of the first front extension line 26; the second front extension line 36, the second loop stem 31 and the second rear extension line 32 are connected in sequence, and one end of the second rear extension line 32 is connected to one end of the second ascending line 33, and the second ascending line 33 is located in the yarn interwoven structure 12, and the middle part of the second ascending line 33 is interwoven up and down with the middle parts of the multiple first descending lines 25 in sequence, and the top of the second ascending line 33 and the bottom of the second ascending line 33 are interwoven up and down in sequence. The height difference is the height of the two second loop stems 31, the other end of the second rising line 33 is connected to one end of the second top line 34, the second top line 34 is located between the two first loop stems 21, the other end of the second top line 34 is connected to one end of the second descending line 35, the second descending line 35 is located in the yarn interwoven structure 12, the middle part of the second descending line 35 and the middle parts of multiple first rising lines 23 are interwoven up and down in sequence, the height difference between the top of the second descending line 35 and the bottom of the second descending line 35 is the height of the two second loop stems 31, and the other end of the second descending line 35 is connected to one end of the second front extension line 36.The first top line 24 is located below the top of a second ring stem 31, and the first top line 24 is located above one end of the second ring stem 31 connected to the second ring stem 31, close to the second rear extension line 32 and the second front extension line 36; the second top line 34 is located below the top of a first ring stem 21, and the second top line 34 is located above one end of the first ring stem 21 connected to the first ring stem 21, close to the first rear extension line 22 and the first front extension line 26. The first ascending line 23 is located below the end of the first second descending line 35 near the first trunk 21, above the middle of the second second descending line 35, and below the end of the third second descending line 35 near the second front extension line 36. The second ascending line 33 is located below the end of the first first descending line 25 near the second trunk 31, above the middle of the second first descending line 25, and below the end of the third first descending line 25 near the first front extension line 26. The first yarn 2 is woven from aramid fiber, glass fiber, polyester fiber, basalt fiber, carbon fiber, polyimide fiber, spandex fiber, hemp fiber, or cotton fiber; and the second yarn 3 is made of aramid fiber, glass fiber, polyester fiber, basalt fiber, carbon fiber, polyimide fiber, spandex fiber, hemp fiber, or cotton fiber.

[0069] A method for preparing a memory material from the in-plane knitted-woven hybrid fabric structure according to claim 1, the method comprising the following steps:

[0070] Step 1: First, use the knitting-weaving technology to weave an in-plane knitted-weaved hybrid fabric structure skeleton 1;

[0071] Step 2: first place the in-plane knitted-woven hybrid fabric structure skeleton 1 in the middle part of the metal mold plate, then fix the in-plane knitted-woven hybrid fabric structure skeleton 1, then place metal height limit plates on both sides of the in-plane knitted-woven hybrid fabric structure skeleton 1, then cover the metal mold plate on the metal mold, and then form a vacuum negative pressure environment in the metal mold and the metal mold plate, and then inject the shape memory polymer 5 into the metal mold, and then the shape memory polymer 5 gradually fills the interior of the in-plane knitted-woven hybrid fabric skeleton 1, and the shape memory polymer 5 covers the surface of the in-plane knitted-woven hybrid fabric structure skeleton 1;

[0072] Step 3: Place the metal mold in an oven, allow the oven to reach a specified temperature, wait for a specified time, then remove the metal mold from the oven to cool, and then remove the shape memory composite material. At this time, the shape memory composite material is solidified and formed to obtain memory material 6.

[0073] In the second step, the vacuum negative pressure environment is a vacuum negative pressure environment of 0.01 to 0.1 MPa; in the third step, the designated temperature is 80 to 280° C., and the designated time is 1 to 10 hours.

[0074] When used, the memory material 6 includes an in-plane knitted-woven hybrid fabric structure skeleton 1, a plurality of first front extension lines 26, a first loop stem 21, and a first rear extension line 22 in the in-plane knitted-woven hybrid fabric structure skeleton 1 form a group of knitted coil structures 11, a plurality of second front extension lines 36, a second loop stem 31, and a second rear extension line 32 form another group of knitted coil structures 11, and the knitted coil structure 11 makes the memory material 6 have the advantage of large deformation, and the first rising line 23 and the second descending line 35, and the first descending line 25 and the second rising line 33 interwoven up and down form a yarn interwoven structure 12, and the yarn interwoven structure 12 makes the memory material 6 have the advantage of large deformation. It has the advantage of high strength, and the rising height of the first rising line 23 and the second rising line 33 is the height of the two first circle stems 21, that is, it rises in the direction of about forty-five degrees, and the falling height of the first descending line 25 and the second descending line 35 is the height of the two first circle stems 21, that is, it descends in the direction of about one hundred and thirty-five degrees, that is, the yarn weaving structure 12 is an oblique yarn weaving structure, and the oblique yarn weaving structure 12 can be pulled longitudinally or transversely, so the memory material 6 has excellent deformation ability in the transverse and longitudinal directions, so it can generate greater tensile recovery force than the existing technology, and when it is wound and deformed, the winding angle can also be further increased.

[0075] Example 2:

[0076] The basic content is the same as Example 1, except that:

[0077] See Figure 1 — Figure 6 A shape memory material based on an in-plane knitted-woven hybrid fabric skeleton structure comprises an in-plane knitted-woven hybrid fabric skeleton 1 and a shape memory polymer 5. The shape memory polymer 5 wraps and fills the in-plane knitted-woven hybrid fabric skeleton 1. The shape memory polymer 5 is a shape memory epoxy resin, shape memory styrene, shape memory polyurethane, shape memory polyimide, or shape memory cyanate ester polymer material.

[0078] A deformation method for preparing a memory material using an in-plane knitted-woven hybrid fabric structure, the method comprising the following steps:

[0079] Step 1: First, connect the surface of the rigid memory material 6 to the heating sheet 41 of the expansion and deformation device 4, so that the longitudinal axis 42 of the memory material 6 is parallel, and then fix the center of the memory material 6 to the positioner 43 in the middle of the axis 42;

[0080] Step 2: First, power is supplied to the motor, which then supplies power to the heating sheet 41 to increase the temperature of the heating sheet 41. At this time, the heating sheet 41 gradually heats the memory material 6 to above the transition temperature, and the memory material 6 becomes flexible. Then, the motor 45 causes the main shaft 42 to rotate axially. At this time, the memory material 6 is wound around the main shaft 42 with the assistance of the auxiliary rod 44.

[0081] Step 3: First, stop the power supply to the motor. At this time, the heating sheet 41 is powered off, and the temperature of the heating sheet 41 and the memory material 6 gradually decreases. After the memory material 6 cools down, it can maintain the winding state;

[0082] Step 4: This step is performed when the memory material 6 needs to be unfolded: first, the motor 45 is powered, and then the motor 45 powers the heating sheet 41 to increase the temperature of the heating sheet 41. At this time, the heating sheet 41 gradually heats the memory material 6 to above the transition temperature. At this time, the memory material 6 uses the strain energy stored during deformation to restore the initial configuration and achieve fixation.

[0083] During use, the memory material 6 is fixed to the corners of the heating sheet 41 by means of dot-shaped double-sided tape, a fixing hole is dug out in the middle of the memory material 6, and the positioner 43 is passed through the fixing hole for fixing; the distance between the auxiliary rod 44 and the main shaft 42 is 3-8 mm to constrain and help the memory material 6 to be wound on the main shaft 42. This winding method makes the unfolding area of the memory material 6 larger and the unfolding method smooth, and also greatly saves the volume and space required for storing the memory material 6, and the unfolding deformation device 4 has a simple structure and a small volume; the unfolding of the memory material 6 is controlled by adjusting the temperature. When the temperature is greater than the transition temperature of the memory material 6, that is, 75-200°C, the memory material 6 becomes flexible, and the memory material 6 can realize the self-expanding process.

[0084] Example 3:

[0085] The basic content is the same as Example 1, except that:

[0086] See Figure 1 — Figure 7 , the first yarn 2 is made of basalt fiber, and the second yarn 3 is made of basalt fiber.

[0087] During application, room-temperature mechanical property testing of an in-plane knitted-woven hybrid fabric structure made of basalt fiber revealed a transverse tensile fracture strain of 360% and a longitudinal tensile fracture strain of 820%, far exceeding the tensile fracture strain of basalt fiber woven fabrics (less than 5%). This transverse tensile fracture strain of the in-plane knitted-woven hybrid fabric was less than the longitudinal tensile fracture strain, contrary to the common pattern of weft knitted fabrics where the transverse tensile fracture strain is greater than the longitudinal tensile fracture strain. This is an advantage provided by the diagonal yarn interwoven structure 12, which provides transverse and longitudinal tensile space. Furthermore, the basalt fiber in-plane knitted-woven hybrid composite material was tested for its U-shaped bending shape memory performance at a bending radius of 7.5 mm. The composite material exhibited a shape retention rate of 99%, a shape recovery rate of 98.7%, and a recovery force of up to 1.5 N. The composite material was then subjected to an unfolding deformation test, demonstrating good unfolding performance.

[0088] Example 4:

[0089] The basic content is the same as Example 1, except that:

[0090] See Figure 1 — Figure 7 , the first yarn 2 is made of aramid fiber, and the second yarn 3 is made of aramid fiber.

[0091] During application, room-temperature mechanical property testing of an in-plane knitted-woven hybrid fabric structure made of aramid fibers revealed a transverse tensile strain at break of 386% and a longitudinal tensile strain at break of 849%. Furthermore, shape memory testing of the in-plane knitted-woven hybrid composite material at a 7.5mm bending radius revealed a shape retention rate of 98%, a shape recovery rate of 97%, and a recovery force of 0.7N. Furthermore, an unfolding deformation test of the in-plane knitted-woven hybrid composite material demonstrated good unfolding performance.

[0092] Example 5:

[0093] The basic content is the same as Example 1, except that:

[0094] See Figure 1 — Figure 7 , the first yarn 2 is made of glass fiber, and the second yarn 3 is made of glass fiber.

[0095] During application, room-temperature mechanical property testing of an in-plane knitted-woven hybrid fabric structure made of glass fiber revealed a transverse tensile fracture strain of 373% and a longitudinal tensile fracture strain of 827%. Furthermore, a U-bend shape memory test of the in-plane knitted-woven hybrid composite at a bending radius of 7.5 mm revealed a shape retention rate of 99%, a shape recovery rate of 98%, and a recovery force of up to 1.3 N. The composite was then subjected to an unfolding deformation test, demonstrating good unfolding performance.

[0096] Example 6:

[0097] The basic content is the same as Example 1, except that:

[0098] See Figure 1 — Figure 7 , the first yarn 2 is made of spandex fiber, and the second yarn 3 is made of spandex fiber.

[0099] When used, spandex fiber itself has good elasticity, and therefore has very excellent transverse tensile and longitudinal tensile fracture strains. The in-plane knitted-woven hybrid composite material prepared from spandex fiber has good shape memory properties and fracture toughness.

[0100] Example 7:

[0101] The basic content is the same as Example 1, except that:

[0102] See Figure 1 — Figure 7 , the first yarn 2 is made of polyimide fiber, and the second yarn 3 is made of polyimide fiber.

[0103] When used, the in-plane knitted-woven hybrid fabric structure prepared from polyimide fibers has excellent transverse tensile and longitudinal tensile fracture strains, so the in-plane knitted-woven hybrid composite material has good shape memory properties, high temperature resistance, fracture toughness and unfolding deformation ability.

[0104] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed in the present invention should be included in the protection scope recorded in the claims.

Claims

1. An in-plane knitted-woven hybrid fabric structure, characterized in that: The in-plane knitted-woven hybrid fabric structure comprises two groups of knitted coil structures (11) knitted by two yarns respectively, and adjacent coils of the two groups of knitted coil structures (11) are interlacedly woven to form a yarn interwoven structure (12) to obtain the in-plane knitted-woven hybrid fabric structure.

2. The in-plane knitted-woven hybrid fabric structure according to claim 1, characterized in that: Two sets of knitted coil structures (11) are knitted respectively by a first yarn (2) and a second yarn (3), wherein the first yarn (2) comprises a plurality of loops of a first trunk (21), a first rear extension line (22), a first ascending line (23), a first top line (24), a first descending line (25) and a first front extension line (26); and the second yarn (3) comprises a plurality of loops of a second trunk (31), a second rear extension line (32), a second ascending line (33), a second top line (34), a second descending line (35) and a second front extension line (36); The first front extension line (26), the first loop stem (21) and the first rear extension line (22) are connected in sequence, one end of the first rear extension line (22) is connected to one end of the first rising line (23), the first rising line (23) is located in the yarn interwoven structure (12), the middle part of the first rising line (23) and the middle parts of the plurality of second descending lines (35) are interwoven up and down in sequence, the height difference between the top of the first rising line (23) and the bottom of the first rising line (23) is the height of the two first loop stems (21), the other end of the first rising line (23) is connected to one end of the first top line (24) The first top line (24) is located between the two second loop stems (31), the other end of the first top line (24) is connected to one end of the first descending line (25), the first descending line (25) is located in the yarn interwoven structure (12), the middle part of the first descending line (25) and the middle parts of the plurality of second ascending lines (33) are interwoven in sequence, the height difference between the top of the first descending line (25) and the bottom of the first descending line (25) is the height of the two first loop stems (21), and the other end of the first descending line (25) is connected to one end of the first front extension line (26); The second front extension line (36), the second loop stem (31) and the second rear extension line (32) are connected in sequence, one end of the second rear extension line (32) is connected to one end of the second rising line (33), the second rising line (33) is located in the yarn interwoven structure (12), the middle part of the second rising line (33) and the middle part of the plurality of first descending lines (25) are interwoven up and down in sequence, the height difference between the top of the second rising line (33) and the bottom of the second rising line (33) is the height of the two second loop stems (31), the other end of the second rising line (33) is connected to one end of the second top line (34) The second top line (34) is located between the two first loop stems (21), the other end of the second top line (34) is connected to one end of the second descending line (35), the second descending line (35) is located in the yarn interwoven structure (12), the middle part of the second descending line (35) and the middle parts of the plurality of first ascending lines (23) are interwoven up and down in sequence, the height difference between the top of the second descending line (35) and the bottom of the second descending line (35) is the height of the two second loop stems (31), and the other end of the second descending line (35) is connected to one end of the second front extension line (36).

3. The in-plane knitted-woven hybrid fabric structure according to claim 2, characterized in that: The first top line (24) is located below the top of a second ring stem (31), and the first top line (24) is located above one end of the second ring stem (31) connected to the second ring stem (31) close to the second rear extension line (32) and the second front extension line (36); The second top line (34) is located below the top of a first ring stem (21), and the second top line (34) is located above one end of the first ring stem (21) connected to the first ring stem (21) close to the first rear extension line (22) and the first front extension line (26).

4. The in-plane knitted-woven hybrid fabric structure according to claim 3, characterized in that: The first ascending line (23) is located below one end of the first second descending line (35) close to the first ring trunk (21), the first ascending line (23) is located above the middle of the second second descending line (35), and the first ascending line (23) is located below one end of the third second descending line (35) close to the second front extension line (36); The second rising line (33) is located below one end of the first first descending line (25) close to the second ring trunk (31), the second rising line (33) is located above the middle of the second first descending line (25), and the second rising line (33) is located below one end of the third first descending line (25) close to the first front extension line (26).

5. The in-plane knitted-woven hybrid fabric structure according to claim 4, characterized in that: The first yarn (2) is woven from aramid fiber, glass fiber, polyester fiber, basalt fiber, carbon fiber, polyimide fiber, spandex fiber, hemp fiber or cotton fiber; The second yarn (3) is made of aramid fiber, glass fiber, polyester fiber, basalt fiber, carbon fiber, polyimide fiber, spandex fiber, hemp fiber or cotton fiber.

6. A method for preparing a memory material using the in-plane knitted-woven hybrid fabric structure according to claim 1, characterized in that: The method comprises the following steps: The first step is to use the knitting-weaving technology to weave the in-plane knitted-weaved hybrid fabric structure skeleton (1); Step 2: first place the in-plane knitted-woven hybrid fabric structure skeleton (1) in the middle of the metal mold plate, then fix the in-plane knitted-woven hybrid fabric structure skeleton (1), then place metal height limit plates on both sides of the in-plane knitted-woven hybrid fabric structure skeleton (1), then cover the metal mold plate on the metal mold, then form a vacuum negative pressure environment between the metal mold and the metal mold plate, then inject the shape memory polymer (5) into the metal mold, and then the shape memory polymer (5) gradually fills the inside of the in-plane knitted-woven hybrid fabric structure skeleton (1), and the shape memory polymer covers the surface of the in-plane knitted-woven hybrid fabric structure skeleton (1); Step 3: First place the metal mold in an oven, then allow the oven to reach a specified temperature, then wait for a specified time, then take the metal mold out of the oven to cool, and then take out the shape memory composite material. At this time, the shape memory composite material is solidified and formed to obtain a memory material (6).

7. The method for preparing a memory material by using an in-plane knitted-woven hybrid fabric structure according to claim 6, characterized in that: In the second step, the vacuum negative pressure environment is a vacuum negative pressure environment of 0.01 to 0.1 MPa; in the third step, the designated temperature is 80 to 280° C., and the designated time is 1 to 10 hours.

8. A shape memory material based on an in-plane knitted-woven hybrid fabric skeleton structure according to claim 6, characterized in that: The material comprises an in-plane knitted-woven hybrid fabric structure skeleton (1) and a shape memory polymer (5), wherein the shape memory polymer (5) wraps and fills the in-plane knitted-woven hybrid fabric structure skeleton (1).

9. The shape memory material based on an in-plane knitted-woven hybrid fabric skeleton structure according to claim 8, characterized in that: The shape memory polymer (5) is a shape memory epoxy resin, shape memory styrene, shape memory polyurethane, shape memory polyimide or shape memory cyanate polymer material.

10. A deformation method for preparing a memory material using the in-plane knitted-woven hybrid fabric structure according to claim 9, characterized in that: The method comprises the following steps: The first step is to connect the surface of the rigid memory material (6) to the heating sheet (41) of the expansion deformation device (4) so that the longitudinal axis (42) of the memory material (6) is parallel, and then fix the center of the memory material (6) to the positioner (43) in the middle of the axis (42); Step 2: First, the motor is powered, and then the motor powers the heating sheet (41) to increase the temperature of the heating sheet (41). At this time, the heating sheet (41) gradually heats the memory material (6) to above the transition temperature, and the memory material (6) becomes flexible. Then, the motor (45) is used to rotate the main shaft (42) axially. At this time, the memory material (6) is wound on the main shaft (42) with the assistance of the auxiliary rod (44); Step 3: First, stop supplying power to the motor. At this time, the heating sheet (41) is powered off, and the temperature of the heating sheet (41) and the memory material (6) gradually decreases. After the memory material (6) cools down, the winding state can be maintained. Step 4: This step is performed when the memory material (6) needs to be unfolded: first, the motor (45) is powered, and then the motor (45) powers the heating sheet (41) to increase the temperature of the heating sheet (41). At this time, the heating sheet (41) gradually heats the memory material (6) to above the transition temperature. At this time, the memory material (6) can restore the initial configuration by using the strain energy stored during deformation and achieve fixation.

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