A siroconic textile introducing a shape memory polymer and a preparation method thereof

Abstract

The application belongs to the technical field of textile material preparation, and provides a siro compact textile with shape memory macromolecule and a preparation method thereof. Shape memory polyurethane filaments are prepared first, then A roving is prepared from combed cotton short fibers and low-melting-point sheath-core polyester short fibers, B roving is prepared from combed cotton short fibers, and the shape memory polyurethane filaments are introduced into the A roving to form an active strand, thereby obtaining eccentric active siro compact yarn; then the eccentric active siro compact yarn is woven with ordinary siro compact yarn in a partitioned manner to form a fabric base cloth, arc surface heat setting treatment is performed, and hot pressing is combined to form a hot anchoring point, so that the obtained fabric can be locally structurally recovered after being heated under pressure, and the obtained fabric has both the structural stability of siro compact yarn and the shape memory response characteristics, and is suitable for functional textiles with local support recovery requirements.

Description

Technical Field

[0001] This invention belongs to the field of textile material preparation technology, and relates to a Siro compact textile fabric incorporating shape memory polymers and its preparation method. Background Technology

[0002] Siro compact spinning technology is a type of spinning technology developed based on Siro spinning and compact spinning. It combines the characteristics of tight yarn structure, good evenness, less hairiness, and high yarn stability, thus having a good foundation for application in the preparation of functional textile materials and high-quality textiles. Existing Siro compact spinning products mainly focus on improving the mechanical properties, surface morphology, and weaving adaptability of yarns. Although the resulting fabrics have certain advantages in terms of appearance smoothness, dimensional stability, and durability, their structural response is still mainly passive, lacking the ability to actively recover after compression, bending, or local collapse. This makes it difficult to meet the application requirements of functional textile materials in the fields of local support, shape recovery, and structural self-recovery.

[0003] Shape memory polymers possess the property of recovering a predetermined shape under external stimuli and have been gradually applied in fibers, films, and fabrics in recent years. However, most existing shape memory textile materials introduce shape memory components into the textile system through ordinary blending, coating, or finishing methods, which can easily lead to problems such as unstable distribution of functional components, insufficient structural constraint, and difficulty in effectively transferring the recovery effect, especially in terms of directional support recovery in local areas of the fabric. At the same time, some existing technologies only focus on the shape memory behavior of the material itself without fully integrating yarn structure design and fabric forming processes, resulting in a difficulty in achieving a balance between local structural recovery, support retention, and wearability in the final product. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a Siro compact textile incorporating shape memory polymers and its preparation method. By preparing shape memory polyurethane filaments, an eccentric active Siro compact yarn containing active and neutral strands is constructed. Combined with zoned weaving, arc-surface heat setting, and hot-pressing anchoring treatment, the resulting fabric can achieve local structural recovery after being subjected to external stimuli, thereby meeting the needs of actual production.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a method for preparing a Siro compact textile incorporating shape memory polymers, the method comprising:

[0007] S1, Polycaprolactone diol and 4,4'-diphenylmethane diisocyanate are mixed and reacted to obtain an isocyanate-terminated prepolymer. 1,4-Butanediol is added to continue the reaction and curing to obtain a thermoplastic shape memory polyurethane elastomer. The elastomer is crushed into granules, and the granules are added to a single-screw melt spinning mill and extruded to obtain nascent filaments. The nascent filaments are stretched and heat-set to obtain shape memory polyurethane filaments.

[0008] S2, combed cotton staple fiber and low-melting-point core-sheath polyester staple fiber are mixed, opened, and then processed through drawing and roving processes to obtain A-strand roving. Combed cotton staple fiber is separately processed through drawing and roving processes to obtain B-strand roving. On a Siro compact spinning machine, A-strand roving and B-strand roving are fed in parallel for yarn forming to obtain eccentric active Siro compact yarn. Among them, the fiber bundle formed by drafting A-strand roving and introducing shape memory polyurethane filaments is the active strand, containing shape memory polyurethane filaments and low-melting-point core-sheath polyester staple fiber; the fiber bundle formed by drafting B-strand roving is the neutral strand, which does not contain shape memory polyurethane filaments and low-melting-point core-sheath polyester staple fiber. The active strand and the neutral strand are distributed side by side along the yarn axis.

[0009] S3, the eccentric active Siro compact yarn and the ordinary combed cotton Siro compact yarn without shape memory polyurethane filament and with the same linear density are respectively packaged and woven in sections on a computer flat knitting machine to obtain the fabric greige.

[0010] S4, the fabric greige is covered on the surface of the arc mold for heat setting, and then the heat-set fabric greige is laid flat with the technical side of the active strand facing the hot pressing mold to form a heat anchor point, thus obtaining the fabric. The fabric is then subjected to a flat pressure load, and after the load is removed, it is heated with hot air to obtain a Siro compact textile with shape memory polymer.

[0011] The preparation method specifically includes:

[0012] S1, Polycaprolactone diol and 4,4'-diphenylmethane diisocyanate are mixed and reacted at 75-85℃ for 1.5-2.5h under a nitrogen atmosphere to obtain an isocyanate-terminated prepolymer. Then, the temperature is lowered to 60-70℃, 1,4-butanediol is added, and the reaction is continued with stirring for 15-25min. The mixture is then quickly poured into a mold and cured in an oven at 80-90℃ for 20-24h to obtain a thermoplastic shape memory polyurethane elastomer. The elastomer is crushed into granules, which are then added to a single-screw melt spinning machine and extruded. After extrusion, the granules are naturally cooled and wound to obtain nascent filaments. The nascent filaments are then stretched and heat-set to obtain shape memory polyurethane filaments.

[0013] S2, combed cotton staple fiber and low-melting-point core-sheath polyester staple fiber are mixed, opened, and then processed through drawing and roving processes to obtain A-strand roving. Combed cotton staple fiber is separately processed through drawing and roving processes to obtain B-strand roving. On a Siro compact spinning machine, A-strand roving and B-strand roving are fed in parallel for yarn forming to obtain eccentric active Siro compact yarn. Among them, the fiber bundle formed by drafting A-strand roving and introducing shape memory polyurethane filaments is the active strand, containing shape memory polyurethane filaments and low-melting-point core-sheath polyester staple fiber; the fiber bundle formed by drafting B-strand roving is the neutral strand, which does not contain shape memory polyurethane filaments and low-melting-point core-sheath polyester staple fiber. The active strand and the neutral strand are distributed side by side along the yarn axis.

[0014] S3, the eccentric active Siro compact yarn and the ordinary combed cotton Siro compact yarn without shape memory polyurethane filament and with the same linear density are respectively packaged and woven in sections on a computer flat knitting machine to obtain the fabric greige.

[0015] S4, the fabric greige is covered on the surface of the arc mold for heat setting, and then the heat-set fabric greige is laid flat with the active strand facing the mold for hot pressing to form heat anchoring points, thus obtaining the fabric. The fabric is then subjected to flat pressure load, and after the load is removed, it is heated with hot air at 60-70℃ for 1-3 minutes to obtain a Siro compact textile with shape memory polymer.

[0016] Shape memory polyurethane filaments consist of polycaprolactone soft segments and hard segments formed by diisocyanate and chain extenders. Hydrogen bonding and segment aggregation in the hard segments form relatively stable physical cross-linking points, maintaining the preset shape during heat setting. During heating, deformation, and cooling, the polycaprolactone soft segments undergo segment orientation and reversible crystallization, fixing the temporary shape after compression. During arc-shaped heat setting, the heat setting temperature is higher than the partial softening temperature of the hard segment domains. Hydrogen bonds in the hard segment domains partially dissociate, increasing segment mobility, allowing the filament to complete orientation rearrangement and conformational stabilization under the preset curvature conditions. After flat compression, the filament retains orientation strain inconsistent with the preset arc-shaped state. Upon reheating, the soft segment mobility recovers, and the segments return to the conformational state corresponding to the heat setting under the constraint of the hard segment physical cross-linking points, thus forming recovery stress output along the fiber axis.

[0017] The recovery stress is transformed into directional structural recovery through eccentric active Siro compact spinning. The compact spinning process causes the fiber bundles to converge and reduces the spinning triangle, increasing the degree of coverage and cohesion of the outer fibers on the filaments; the Siro spinning process twists the two strands side by side, forming a structure that is distributed parallel to each other along the yarn axis. In this invention, the shape memory polyurethane filament is only set on the active strand side, and the neutral strand does not contain this filament, so the recovery ability on the yarn cross-section is eccentrically distributed. After heating, the active strand side generates recovery shrinkage and recovery tension, while the neutral strand side mainly provides frictional constraint, cross-sectional balance and structural support. Therefore, the yarn as a whole exhibits a shrinkage and bending tendency biased towards the active strand side, rather than a symmetrical overall shortening of the cross-section.

[0018] Low-melting-point core-sheath polyester staple fibers form localized thermal anchoring points during hot pressing. The sheath layer, made of isophthalic acid-modified copolyester, softens and melts at the hot pressing temperature, forming an adhesive interface with surrounding cotton fibers, adjacent yarn surfaces, and nearby thermally bonded staple fibers. The core layer, made of polyethylene terephthalate, remains solid at the hot pressing temperature, maintaining the integrity of the fiber skeleton structure. After the thermal anchoring points are formed, the localized support area is no longer a completely free coil network but is divided into multiple interconnected, confined segments. Shape memory polyurethane filaments cannot undergo unrestrained shrinkage when heated; their recovery strain can only be released between adjacent thermal anchoring points, thus restricting and concentrating the axial recovery of the filament within a localized area.

[0019] The local structural recovery of the fabric is achieved through the yarn arrangement direction, the distribution of thermal anchor points, and the geometry of the knitted loops. During zoned knitting, the active strands are always located on the same technical surface of the fabric, thus forming an active side and a constrained side in the thickness direction of the local support area. After flat pressing, the local loops are flattened, and the loop arcs, intersections, and yarn bending states deviate from their spatial positions during heat setting. Upon reheating, the recovery stress on the active side continues to act in the same direction, thereby restoring the local support area from a flat state to the arc surface state of heat setting. In this invention, shape memory polyurethane filaments are responsible for providing recovery stress, eccentric active Siro compact yarn is responsible for directional transmission, thermal anchor points are responsible for establishing local constrained boundaries, and zoned knitting is responsible for integrating the eccentric recovery of individual yarns into the overall structural recovery of the local support area.

[0020] As a preferred embodiment of the present invention, in S1, the mass ratio of polycaprolactone diol, 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol is (80-85):(40-46):(14-18), for example, it can be (80, 80.5, 81, 81.5, 82, 82.5, 83, 83.5, 84, 84.5 or 85):(40, 40.6, 41.2, 41.8, 42.4, 43, 43.6, 44.2, 44.8, 45.4 or 46):(14, 14.4, 14.8, 15.2, 15.6, 16.0, 16.4, 16.8, 17.2, 17.6 or 18), but it is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0021] In some optional embodiments, the number-average molecular weight Mn of the polycaprolactone diol is 3500-4500 g / mol, for example, it can be 3500 g / mol, 3600 g / mol, 3700 g / mol, 3800 g / mol, 3900 g / mol, 4000 g / mol, 4100 g / mol, 4200 g / mol, 4300 g / mol, 4400 g / mol or 4500 g / mol, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0022] In some optional embodiments, the particle size of the granules is 3-5 mm, for example, it can be 3.0 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4.0 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm or 5.0 mm, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0023] In some optional embodiments, the temperatures of each section of the single-screw melt spinning machine are: 155-165°C for the feeding section, 170-180°C for the compression section, 175-185°C for the metering section, and 180-190°C for the spinning assembly. For example, it could be: feeding section (155, 156, 157, 158, 159, 160, 161, 162, 163, 164 or 165) ℃, compression section (170, 171, 172, 173, 174, 175, 176, 177, 178, 179 or 180) ℃, metering section (175, 176, 177, 178, 179, 180, 181, 182, 183, 184 or 185) ℃, spinning assembly temperature (180, 181, 182, 183, 184, 185, 186, 187, 188, 189 or 190) ℃, but it is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0024] In some alternative embodiments, the extrusion speed is 2.5-4.0 m / min, and a three-hole spinneret with an aperture of 0.25-0.35 mm and an aspect ratio of (3-4):1 is used. For example, it could be an extrusion speed of (2.5, 2.65, 2.8, 2.95, 3.1, 3.25, 3.4, 3.55, 3.7, 3.85 or 4.0) m / min, using a three-hole spinneret with an orifice diameter of (0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34 or 0.35) mm and an aspect ratio of (3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9 or 4.0):1, but it is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0025] In some alternative embodiments, the stretching is performed at a ratio of 2.0 to 3.5 under hot roller conditions at 45-60°C, for example, at a ratio of (2.0, 2.15, 2.3, 2.45, 2.6, 2.75, 2.9, 3.05, 3.2, 3.35, or 3.5) under hot roller conditions at (45, 46.5, 48, 49.5, 51, 52.5, 54, 55.5, 57, 58.5, or 60)°C, but is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0026] In some optional embodiments, the heat setting is heat setting at 55-70°C for 20-60 seconds, for example, it can be heat setting at (55, 56.5, 58, 59.5, 61, 62.5, 64, 65.5, 67, 68.5 or 70)°C for (20, 24, 28, 32, 36, 40, 44, 48, 52, 56 or 60) seconds, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0027] In some optional embodiments, the linear density of the shape memory polyurethane filament is 44-110 dtex, for example, it can be 44 dtex, 50.6 dtex, 57.2 dtex, 63.8 dtex, 70.4 dtex, 77 dtex, 83.6 dtex, 90.2 dtex, 96.8 dtex, 103.4 dtex or 110 dtex, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0028] In a preferred embodiment of the present invention, in S2, the low-melting-point core-sheath polyester staple fiber is a core-sheath composite staple fiber. The sheath layer is an isophthalic acid-modified copolyester with a melting point of 100-110°C, and the core layer is polyethylene terephthalate with a melting point of 255-260°C. The mass ratio of the sheath layer to the core layer is 1:1. In the A-strand roving, the low-melting-point core-sheath polyester staple fiber has a length of 38 mm and a linear density of 2.2 dtex. The mass ratio of combed cotton staple fiber to low-melting-point core-sheath polyester staple fiber is 100:(5-12). For example, the mass ratio of combed cotton staple fiber to low-melting-point core-sheath polyester staple fiber can be 100:(5, 5.7, 6.4, 7.1, 7.8, 8.5, 9.2, 9.9, 10.6, 11.3, or 12), but it is not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0029] In some optional embodiments, the linear density of the A-strand roving is 500-650 tex, for example, it can be 500 tex, 515 tex, 530 tex, 545 tex, 560 tex, 575 tex, 590 tex, 605 tex, 620 tex, 635 tex or 650 tex, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0030] In some optional embodiments, the linear density of the B-strand roving is 500-650 tex, for example, it can be 500 tex, 515 tex, 530 tex, 545 tex, 560 tex, 575 tex, 590 tex, 605 tex, 620 tex, 635 tex or 650 tex, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0031] In some optional embodiments, the spacing of the parallel feeding is 6-10 mm, for example, it can be 6 mm, 6.4 mm, 6.8 mm, 7.2 mm, 7.6 mm, 8.0 mm, 8.4 mm, 8.8 mm, 9.2 mm, 9.6 mm or 10 mm, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0032] In some optional embodiments, the yarn forming process involves introducing the shape memory polyurethane filament in front of the drafting zone of the A-strand roving, with an overfeed rate of 0.5-2.0%, a feed tension of 0.05-0.20 cN / dtex, a draft ratio of 28-36, a negative pressure of 1.8-2.8 kPa, a front roller output speed of 14-18 m / min, a spindle speed of 11000-14000 r / min, and a yarn twist of 650-780 twists / m. For example, the overfeed rate could be (0.5%, 0.65%, 0.8%, 0.95%, 1.1%, 1.25%, 1.4%, 1.55%, 1.7%, 1.85%, or 2.0%), the feed tension could be (0.05, 0.065, 0.08, 0.095, 0.11, 0.125, 0.14, 0.155, 0.17, 0.185, or 0.20) cN / dtex, the draw ratio could be (28, 28.8, 29.6, 30.4, 31.2, 32, 32.8, 33.6, 34.4, 35.2, or 36), and the negative pressure could be (1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, or 2). The output speed of the front roller is (14, 14.4, 14.8, 15.2, 15.6, 16.0, 16.4, 16.8, 17.2, 17.6 or 18) m / min, the spindle speed is (11000, 11300, 11600, 11900, 12200, 12500, 12800, 13100, 13400, 13700 or 14000) r / min, and the yarn twist is (650, 663, 676, 689, 702, 715, 728, 741, 754, 767 or 780) twists / m, but is not limited to the listed values; other unlisted values ​​within this range also apply.

[0033] In some alternative embodiments, the linear density of the eccentric active Siro compact yarn is 18-24 tex, for example, it can be 18 tex, 18.6 tex, 19.2 tex, 19.8 tex, 20.4 tex, 21 tex, 21.6 tex, 22.2 tex, 22.8 tex, 23.4 tex or 24 tex, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0034] As a preferred technical solution of the present invention, in S3, the needle pitch of the computerized flat knitting machine is 14G-16G, for example, it can be 14G, 14.2G, 14.4G, 14.6G, 14.8G, 15G, 15.2G, 15.4G, 15.6G, 15.8G or 16G, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0035] In some optional embodiments, the partitioned knitting consists of a partially supported area and a non-supported area. The basic structure of the partitioned knitting is 1+1 rib, double rib, or Milanese rib. The warp density is controlled at 12-18 rows / cm, and the cross density is 10-16 rows / cm. The partially supported area is continuously knitted for 20-60 rows with 15-40 stitches, using only the eccentric active Siro compact yarn. The non-supported area is knitted using the ordinary combed cotton Siro compact yarn, and the yarn entry direction is adjusted by a yarn guide to ensure that the active strand is always located on the same technical surface of the fabric in each knitting row. For example, it could be: controlling the fabric wale density to (12, 12.6, 13.2, 13.8, 14.4, 15, 15.6, 16.2, 16.8, 17.4 or 18) columns / cm, the cross density to (10, 10.6, 11.2, 11.8, 12.4, 13, 13.6, 14.2, 14.8, 15.4 or 16) rows / cm, and continuously knitting (20, 24, 28, 32, 36, 40, 44, 48, 52, 56 or 60) rows and (15, 17.5, 20, 22.5, 25, 27.5, 30, 32.5, 35, 37.5 or 40) needles in the local support area and using only the aforementioned eccentric active Siro compact yarn, but not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0036] As a preferred technical solution of the present invention, in S4, the arc height of the arc mold is 6-10mm and the radius of curvature is 20-35mm. For example, the arc height can be (6, 6.4, 6.8, 7.2, 7.6, 8.0, 8.4, 8.8, 9.2, 9.6 or 10)mm and the radius of curvature can be (20, 21.5, 23, 24.5, 26, 27.5, 29, 30.5, 32, 33.5 or 35)mm, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0037] In some optional embodiments, the heat setting temperature is 110-125°C and the time is 2-5 min. For example, the temperature can be (110, 111.5, 113, 114.5, 116, 117.5, 119, 120.5, 122, 123.5 or 125)°C and the time can be (2.0, 2.3, 2.6, 2.9, 3.2, 3.5, 3.8, 4.1, 4.4, 4.7 or 5.0) min, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0038] In some optional embodiments, the hot pressing temperature is 110-125℃, the pressure is 0.15-0.35MPa, and the time is 5-12s. After hot pressing, hot anchor points are formed. The hot anchor points are dot-shaped or short line-shaped. The outer circle diameter of the dot-shaped hot anchor point is 0.8-2.5mm, the length of the short line-shaped hot anchor point is 0.8-2.5mm, and the distance between adjacent hot anchor points is 3-8mm. For example, it could be: a temperature of (110, 111.5, 113, 114.5, 116, 117.5, 119, 120.5, 122, 123.5 or 125) °C, a pressure of (0.15, 0.17, 0.19, 0.21, 0.23, 0.25, 0.27, 0.29, 0.31, 0.33 or 0.35) MPa, a time of (5, 5.7, 6.4, 7.1, 7.8, 8.5, 9.2, 9.9, 10.6, 11.3 or 12) s, and a circumscribed circle diameter of (0.8, ...) for the point-like thermal anchoring point. The length of short linear thermal anchor points is (0.8, 0.97, 1.14, 1.31, 1.48, 1.65, 1.82, 1.99, 2.16, 2.33 or 2.5) mm, and the spacing between adjacent thermal anchor points is (3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5 or 8) mm, but is not limited to the listed values; other unlisted values ​​within this range also apply.

[0039] In some optional embodiments, the pressure of the flat load is 10-30 kPa and the time is 30-60 s. For example, the pressure can be (10, 12, 14, 16, 18, 20, 22, 24, 26, 28 or 30) kPa and the time can be (30, 33, 36, 39, 42, 45, 48, 51, 54, 57 or 60) s, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0040] In a second aspect, the present invention provides a Siro compact textile fabric incorporating shape memory polymers, prepared by the preparation method described in the first aspect.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention introduces shape memory polyurethane filaments into a Siro compact spinning structure, and combines the parallel distribution of active and neutral strands, zoned weaving, arc-shaped heat setting, and hot-pressing anchoring treatment, so that the resulting fabric can achieve local structural recovery after being compressed by external stimulation. Compared with the prior art, the present invention utilizes the characteristics of Siro compact spinning yarn structure stability and good fiber cohesion to improve the binding stability and effect transmission efficiency of shape memory components in the yarn, and uses hot anchoring points to locally constrain the recovery path, so that the recovery effect is concentrated in the preset support area, avoiding disordered deformation. The resulting fabric has structural stability, local support, and recovery, and is suitable for functional textiles that require local shape retention and recovery after compression. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the partial support area structure provided by the present invention. Detailed Implementation

[0043] The technical solutions of the present invention will be described in detail below with reference to specific embodiments and accompanying drawings. The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the present invention; these descriptions are explanatory and exemplary, and should not be construed as limiting the implementation methods or the scope of protection of the present invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0044] The chemical reagents used in the embodiments and comparative examples of this invention are all commercially available products and have not undergone any further purification treatment.

[0045] Example 1

[0046] This embodiment provides a Siro compact textile incorporating shape memory polymers and its preparation method, the preparation method specifically including the following steps:

[0047] S1, polycaprolactone diol with a number average molecular weight of 3500 g / mol was mixed with 4,4'-diphenylmethane diisocyanate and reacted at 75°C for 2.5 h under a nitrogen atmosphere to obtain an isocyanate-terminated prepolymer. The mixture was then cooled to 60°C, and 1,4-butanediol was added, with stirring continued for 25 min. The mixture was then quickly poured into a mold and cured in an oven at 80°C for 24 h to obtain a thermoplastic shape memory polyurethane elastomer. The mass ratio of polycaprolactone diol, 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol was 80:46:14. The elastomer was then crushed into 3 mm granules, and the granules were added to… The single-screw melt spinning mill is used for extrusion. The temperatures of each section of the single-screw melt spinning mill are: 155°C for the feeding section, 180°C for the compression section, 175°C for the metering section, and 190°C for the spinning assembly. The extrusion speed is 2.5 m / min, and a three-hole spinneret with an aperture of 0.35 mm and an aspect ratio of 3:1 is used. After extrusion, the yarn is naturally cooled and wound up to obtain nascent filament. The nascent filament is then drawn and heat-set. The drawing is performed at 3.5 times the length under 60°C hot roller conditions, and the heat setting is performed at 55°C for 60 s to obtain shape memory polyurethane filament with a linear density of 44 dtex.

[0048] S2, combed cotton staple fiber and low-melting-point core-sheath polyester staple fiber are mixed, opened, and then processed through drawing and roving processes to obtain A-strand roving with a linear density of 650 tex. The low-melting-point core-sheath polyester staple fiber is a core-sheath composite staple fiber, with the sheath layer being isophthalic acid-modified copolyester with a melting point of 100°C, and the core layer being polyethylene terephthalate with a melting point of 255°C. The mass ratio of the sheath layer to the core layer is 1:1. In the A-strand roving, the low-melting-point core-sheath polyester staple fiber has a length of 38 mm and a linear density of 2.2 dtex, and the mass ratio of combed cotton staple fiber to low-melting-point core-sheath polyester staple fiber is 100:12. Separately, combed cotton staple fiber is processed separately through drawing and roving processes to obtain B-strand roving with a linear density of 650 tex. On a Siro compact spinning machine, the A-strand roving and B-strand roving are fed in parallel at a speed of 6 mm. The yarn forming process involves introducing the shape memory polyurethane filament in front of the drafting zone of the A-strand roving, with an overfeed rate of 2.0%, a feed tension of 0.05 cN / dtex, a draft ratio of 28, a negative pressure of 2.8 kPa, a front roller output speed of 14 m / min, a spindle speed of 14000 r / min, and a yarn twist of 650 twists / m, resulting in an eccentric active Siro compact yarn with a linear density of 24 tex. The fiber bundle formed by drafting the A-strand roving and introducing the shape memory polyurethane filament is the active strand, containing shape memory polyurethane filament and low-melting-point core-sheath polyester staple fiber; the fiber bundle formed by drafting the B-strand roving is the neutral strand, not containing shape memory polyurethane filament or low-melting-point core-sheath polyester staple fiber. The active strand and the neutral strand are distributed side-by-side along the yarn axis.

[0049] S3, the eccentric active Siro compact yarn and the ordinary combed cotton Siro compact yarn with the same linear density but without shape memory polyurethane filament are separately packaged and knitted in sections on a computerized flat knitting machine with a needle pitch of 14G. The section knitting consists of a partial support area and a non-support area. The basic structure of the section knitting is 1+1 rib. The warp density of the fabric is controlled to be 18 rows / cm and the weft density is 10 rows / cm. The partial support area is knitted continuously for 60 rows and 40 stitches using only the eccentric active Siro compact yarn. The non-support area is knitted using the ordinary combed cotton Siro compact yarn. At the same time, the yarn needle entry direction is adjusted by the yarn guide so that the active strand is always located on the same technical surface of the fabric in each knitting row, thus obtaining the fabric greige.

[0050] S4. The fabric greige is covered on the surface of an arc mold with an arc height of 10mm and a radius of curvature of 20mm for heat setting at 125℃ for 2 minutes. The heat-set fabric greige is then laid flat with the active strand facing the mold and hot-pressed at 125℃ at 0.15MPa for 12 seconds. This hot-pressing creates point anchors, each point having a circumscribed circle diameter of 2.5mm and a spacing of 3mm between adjacent points. The resulting fabric is then subjected to a flat-press load of 30kPa for 30 seconds. After removing the load, it is heated with 70℃ hot air for 1 minute to obtain a Siro compact textile incorporating shape memory polymers. Figure 1 As shown, the Siro compact fabric in this embodiment includes a partially supported area and non-supported areas located on both sides thereon. The partially supported area is provided with thermal anchoring points, and the active yarn is located on the same technical surface of the fabric in each weaving row.

[0051] Example 2

[0052] This embodiment provides a Siro compact textile incorporating shape memory polymers and its preparation method, the preparation method specifically including the following steps:

[0053] S1, polycaprolactone diol with a number average molecular weight of 4500 g / mol was mixed with 4,4'-diphenylmethane diisocyanate and reacted at 85°C for 1.5 h under a nitrogen atmosphere to obtain an isocyanate-terminated prepolymer. The mixture was then cooled to 70°C, and 1,4-butanediol was added, with stirring continued for 15 min. The mixture was then quickly poured into a mold and cured in a 90°C oven for 20 h to obtain a thermoplastic shape memory polyurethane elastomer. The mass ratio of polycaprolactone diol, 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol was 85:40:18. The elastomer was crushed into 5 mm granules, and the granules were added to a monopolymer... In a screw melt spinning mill, the single screw melt spinning mill has the following temperatures: feeding section 165℃, compression section 170℃, metering section 185℃, and spinning assembly temperature 180℃. The extrusion speed is 4.0 m / min, and a three-hole spinneret with a diameter of 0.25 mm and an aspect ratio of 4:1 is used. After extrusion, the yarn is naturally cooled and wound to obtain nascent filament. The nascent filament is then drawn and heat-set. The drawing is performed at 2.0 times the length under 45℃ hot roller conditions, and the heat setting is performed at 70℃ for 20 seconds to obtain shape memory polyurethane filament with a linear density of 110 dtex.

[0054] S2, combed cotton staple fiber and low-melting-point core-sheath polyester staple fiber are mixed, opened, and then processed through drawing and roving processes to obtain A-strand roving with a linear density of 500 tex. The low-melting-point core-sheath polyester staple fiber is a core-sheath composite staple fiber, with the sheath layer being isophthalic acid-modified copolyester with a melting point of 104°C, and the core layer being polyethylene terephthalate with a melting point of 260°C. The mass ratio of the sheath layer to the core layer is 1:1. In the A-strand roving, the low-melting-point core-sheath polyester staple fiber has a length of 38 mm and a linear density of 2.2 dtex, and the mass ratio of combed cotton staple fiber to low-melting-point core-sheath polyester staple fiber is 100:5. Separately, combed cotton staple fiber is processed separately through drawing and roving processes to obtain B-strand roving with a linear density of 500 tex. On a Siro compact spinning machine, the A-strand roving and B-strand roving are fed in parallel at a speed of 10 mm. The yarn is then processed as follows: Shape memory polyurethane filaments are introduced in front of the drafting zone of the A-strand roving, with an overfeed rate of 0.5%, a feed tension of 0.20 cN / dtex, a draft ratio of 36, a negative pressure of 1.8 kPa, a front roller output speed of 18 m / min, a spindle speed of 11000 r / min, and a yarn twist of 780 twists / m, resulting in an eccentric active Siro compact yarn with a linear density of 18 tex. The fiber bundle formed by drafting the A-strand roving and introducing the shape memory polyurethane filaments is the active strand, containing shape memory polyurethane filaments and low-melting-point core-sheath polyester staple fibers; the fiber bundle formed by drafting the B-strand roving is the neutral strand, not containing shape memory polyurethane filaments or low-melting-point core-sheath polyester staple fibers. The active strand and the neutral strand are distributed side-by-side along the yarn axis.

[0055] S3, the eccentric active Siro compact yarn and the ordinary combed cotton Siro compact yarn with the same linear density but without shape memory polyurethane filament are separately packaged and knitted in sections on a computerized flat knitting machine with a needle pitch of 16G. The section knitting consists of a partial support area and a non-support area. The basic structure of the section knitting is double rib. The warp density of the fabric is controlled to be 12 rows / cm and the weft density to be 16 rows / cm. The partial support area is knitted continuously for 20 rows and 15 needles using only the eccentric active Siro compact yarn. The non-support area is knitted using the ordinary combed cotton Siro compact yarn. At the same time, the yarn needle entry direction is adjusted by the yarn guide so that the active strand is always located on the same technical surface of the fabric in each knitting row, thus obtaining the fabric greige.

[0056] S4. The fabric greige is covered on the surface of an arc mold with an arc height of 6 mm and a radius of curvature of 35 mm for heat setting at a temperature of 110°C for 5 minutes. The heat-set fabric greige is then laid flat with the active strand facing the mold and hot-pressed at a temperature of 110°C, a pressure of 0.35 MPa, and a time of 5 seconds. After hot pressing, hot anchor points are formed. The hot anchor points are short lines with a circumscribed circle diameter of 0.8 mm for each individual hot anchor point and a spacing of 8 mm between adjacent hot anchor points. The fabric is then subjected to a flat pressure load of 10 kPa for 60 seconds. After removing the load, the fabric is heated with hot air at 60°C for 3 minutes to obtain a Siro compact textile incorporating shape memory polymers.

[0057] Example 3

[0058] This embodiment provides a Siro compact textile incorporating shape memory polymers and its preparation method, the preparation method specifically including the following steps:

[0059] S1, polycaprolactone diol with a number average molecular weight of 4000 g / mol was mixed with 4,4'-diphenylmethane diisocyanate and reacted at 80°C for 2.0 h under a nitrogen atmosphere to obtain an isocyanate-terminated prepolymer. The mixture was then cooled to 65°C, and 1,4-butanediol was added, with stirring continued for 20 min. The mixture was then quickly poured into a mold and cured in an oven at 85°C for 22 h to obtain a thermoplastic shape memory polyurethane elastomer. The mass ratio of polycaprolactone diol, 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol was 82:43:16. The elastomer was crushed into 4 mm granules, and the granules were added to a monopolymer... In a screw melt spinning mill, the single screw melt spinning mill has the following temperatures: feeding section 160℃, compression section 175℃, metering section 180℃, and spinning assembly temperature 185℃. The extrusion speed is 3.2 m / min, and a three-hole spinneret with an aperture of 0.30 mm and an aspect ratio of 3.5:1 is used. After extrusion, the yarn is naturally cooled and wound to obtain nascent filament. The nascent filament is then drawn and heat-set. The drawing is performed at 3.0 times the length under 55℃ hot roller conditions, and the heat setting is performed at 65℃ for 40 s to obtain shape memory polyurethane filament with a linear density of 75 dtex.

[0060] S2, combed cotton staple fiber and low-melting-point core-sheath polyester staple fiber are mixed, opened, and then processed through drawing and roving processes to obtain A-strand roving with a linear density of 580 tex. The low-melting-point core-sheath polyester staple fiber is a core-sheath composite staple fiber, with the sheath layer being isophthalic acid-modified copolyester with a melting point of 110°C, and the core layer being polyethylene terephthalate with a melting point of 256°C. The mass ratio of the sheath layer to the core layer is 1:1. In the A-strand roving, the low-melting-point core-sheath polyester staple fiber has a length of 38 mm and a linear density of 2.2 dtex, and the mass ratio of combed cotton staple fiber to low-melting-point core-sheath polyester staple fiber is 100:8. Separately, combed cotton staple fiber is processed separately through drawing and roving processes to obtain B-strand roving with a linear density of 580 tex. On a Siro compact spinning machine, the A-strand roving and B-strand roving are fed in parallel at a speed of 7 mm. The yarn is then processed as follows: Shape memory polyurethane filaments are introduced in front of the drafting zone of the A-strand roving, with an overfeed rate of 1.2%, a feed tension of 0.12 cN / dtex, a draft ratio of 32, a negative pressure of 2.2 kPa, a front roller output speed of 16 m / min, a spindle speed of 12500 r / min, and a yarn twist of 720 twists / m, resulting in an eccentric active Siro compact yarn with a linear density of 21 tex. The fiber bundle formed by drafting the A-strand roving and introducing the shape memory polyurethane filaments is the active strand, containing shape memory polyurethane filaments and low-melting-point core-sheath polyester staple fibers; the fiber bundle formed by drafting the B-strand roving is the neutral strand, not containing shape memory polyurethane filaments or low-melting-point core-sheath polyester staple fibers. The active strand and the neutral strand are distributed side-by-side along the yarn axis.

[0061] S3, the eccentric active Siro compact yarn and the ordinary combed cotton Siro compact yarn with the same linear density but without shape memory polyurethane filament are separately packaged and knitted in sections on a computerized flat knitting machine with a needle pitch of 15G. The section knitting consists of a partial support area and a non-support area. The basic structure of the section knitting is Milan rib. The warp density of the fabric is controlled to be 15 rows / cm and the weft density to be 13 rows / cm. The partial support area is knitted continuously for 40 rows and 25 stitches using only the eccentric active Siro compact yarn. The non-support area is knitted using the ordinary combed cotton Siro compact yarn. At the same time, the yarn needle entry direction is adjusted by the yarn guide so that the active strand is always located on the same technical surface of the fabric in each knitting row, thus obtaining the fabric greige.

[0062] S4. The fabric greige is covered on the surface of an arc mold with an arc height of 8 mm and a radius of curvature of 28 mm for heat setting at a temperature of 115°C for 3.5 min. The heat-set fabric greige is then laid flat with the active strand facing the mold and hot-pressed at a temperature of 118°C, a pressure of 0.25 MPa, and a time of 8 s. After hot pressing, hot anchor points are formed. The hot anchor points are dot-shaped, with an outer circle diameter of 1.5 mm for each individual hot anchor point and a spacing of 5 mm between adjacent hot anchor points. The resulting fabric is then subjected to a flat pressure load of 20 kPa for 45 s. After removing the load, it is heated with hot air at 67°C for 2 min to obtain a Siro compact textile incorporating shape memory polymers.

[0063] Example 4

[0064] This embodiment provides a Siro compact textile incorporating shape memory polymers and its preparation method, the preparation method specifically including the following steps:

[0065] S1, polycaprolactone diol with a number-average molecular weight of 3800 g / mol was mixed with 4,4'-diphenylmethane diisocyanate and reacted at 78°C for 2.2 h under a nitrogen atmosphere to obtain an isocyanate-terminated prepolymer. The mixture was then cooled to 68°C, and 1,4-butanediol was added. The reaction was continued with stirring for 18 min, and the mixture was quickly poured into a mold and cured in an oven at 88°C for 22 h to obtain a thermoplastic shape memory polyurethane elastomer. The mass ratio of polycaprolactone diol, 4,4'-diphenylmethane diisocyanate, and 1,4-butanediol was 84:42:15. The elastomer was then crushed into 4.5 mm granules, and the granules were added to… The extrusion process is carried out in a single-screw melt spinning mill. The temperatures of each section of the single-screw melt spinning mill are as follows: feeding section 162℃, compression section 178℃, metering section 182℃, and spinning assembly temperature 188℃. The extrusion speed is 3.5m / min, and a three-hole spinneret with an aperture of 0.28mm and an aspect ratio of 3.2:1 is used. After extrusion, the yarn is naturally cooled and wound to obtain nascent filament. The nascent filament is then drawn and heat-set. The drawing is performed at 2.8 times the length under 50℃ hot roller conditions, and the heat setting is performed at 60℃ for 50s to obtain shape memory polyurethane filament with a linear density of 55dtex.

[0066] S2, combed cotton staple fiber and low-melting-point core-sheath polyester staple fiber are mixed, opened, and then processed through drawing and roving processes to obtain A-strand roving with a linear density of 550 tex. The low-melting-point core-sheath polyester staple fiber is a core-sheath composite staple fiber, with the sheath layer being isophthalic acid modified copolyester with a melting point of 108°C, and the core layer being polyethylene terephthalate with a melting point of 258°C. The mass ratio of the sheath layer to the core layer is 1:1. In the A-strand roving, the low-melting-point core-sheath polyester staple fiber has a length of 38 mm and a linear density of 2.2 dtex, and the mass ratio of combed cotton staple fiber to low-melting-point core-sheath polyester staple fiber is 100:10. Separately, combed cotton staple fiber is processed separately through drawing and roving processes to obtain B-strand roving with a linear density of 550 tex. On a Siro compact spinning machine, the A-strand roving and B-strand roving are fed in parallel at a distance of 9 mm. The yarn is processed by introducing the shape memory polyurethane filament in front of the drafting zone of the A-strand roving. The overfeed rate is 1.5%, the feed tension is 0.1 cN / dtex, the draft ratio is controlled at 30, the negative pressure is 2.5 kPa, the front roller output speed is 15 m / min, the spindle speed is 13000 r / min, and the yarn twist is 680 twists / m, resulting in an eccentric active Siro compact yarn with a linear density of 20 tex. The fiber bundle formed by the drafting of the A-strand roving and the introduction of the shape memory polyurethane filament is the active strand, containing shape memory polyurethane filament and low-melting-point core-sheath polyester staple fiber; the fiber bundle formed by the drafting of the B-strand roving is the neutral strand, which does not contain shape memory polyurethane filament and low-melting-point core-sheath polyester staple fiber. The active strand and the neutral strand are distributed side by side along the yarn axis.

[0067] S3, the eccentric active Siro compact yarn and the ordinary combed cotton Siro compact yarn with the same linear density but without shape memory polyurethane filament are separately packaged and knitted in sections on a computerized flat knitting machine with a needle pitch of 15G. The section knitting consists of a partial support area and a non-support area. The basic structure of the section knitting is 1+1 rib. The warp density of the fabric is controlled to be 16 rows / cm and the weft density to be 12 rows / cm. The partial support area is knitted continuously for 50 rows and 30 stitches using only the eccentric active Siro compact yarn. The non-support area is knitted using the ordinary combed cotton Siro compact yarn. At the same time, the yarn needle entry direction is adjusted by the yarn guide so that the active strand is always located on the same technical surface of the fabric in each knitting row, thus obtaining the fabric greige.

[0068] S4. The fabric greige is covered on the surface of an arc mold with an arc height of 9 mm and a radius of curvature of 30 mm for heat setting at a temperature of 118°C for 4 min. The heat-set fabric greige is then laid flat with the active strand facing the mold and hot-pressed at a temperature of 120°C, a pressure of 0.30 MPa, and a time of 10 s. After hot pressing, hot anchor points are formed. The hot anchor points are short lines with a circumscribed circle diameter of 1.8 mm for each individual hot anchor point and a spacing of 6 mm between adjacent hot anchor points. The resulting fabric is then subjected to a flat pressure load of 25 kPa for 50 s. After removing the load, it is heated with hot air at 63°C for 2.5 min to obtain a Siro compact textile incorporating shape memory polymers.

[0069] Comparative Example 1

[0070] This comparative example provides a method for preparing a Siro compact textile with shape memory polymers. The difference between this method and Example 1 is that shape memory polyurethane filaments are not introduced in front of the drafting zone of the A-strand roving in S2. Other process parameters and operating conditions are exactly the same as in Example 1.

[0071] Comparative Example 2

[0072] This comparative example provides a method for preparing a Siro compact textile with shape memory polymer. The difference between this method and Example 1 is that in S4, only the fabric greige is covered on the surface of the curved mold for heat setting, without hot pressing to form heat anchoring points. Other process parameters and operating conditions are exactly the same as in Example 1.

[0073] Comparative Example 3

[0074] This comparative example provides a method for preparing a Siro compact textile with shape memory polymers. The difference between this method and Example 1 is that, in S3, during the partitioned weaving, the active strands are not controlled to be located on the same technical surface of the fabric in each weaving row, so that the active strands are alternately distributed in the fabric. Other process parameters and operating conditions are exactly the same as in Example 1.

[0075] The test method for local arc height recovery rate is as follows: cut a sample containing a complete local support area, place the sample flat on a horizontal platform, take the platform as the reference plane, measure the distance from the highest point of the local support area to the reference plane, and record it as the initial arc height. Then apply a flat pressure load to the local support area to make it flattened. After unloading, measure the arc height after pressure. Then heat it with hot air. After the shape stabilizes, measure the recovered arc height. Local arc height recovery rate = (recovered arc height - arc height after pressure) / (initial arc height - arc height after pressure) × 100%.

[0076] The test method for local thickness recovery rate is as follows: a fixed measuring point is selected in the local support area, and the initial thickness of the sample after arc surface heat setting is measured at the measuring point using a conventional fabric thickness gauge. After applying a flat pressure load to the local support area, the thickness after compression is measured. Then, hot air heating is performed, and the recovery thickness is measured after the recovery stabilizes. Local thickness recovery rate = (recovery thickness - thickness after compression) / (initial thickness - thickness after compression) × 100%.

[0077] The test method for cyclic support retention rate is as follows: A sample containing a complete local support area is cut. First, its initial arc height is measured. Then, the local support area is repeatedly subjected to flat load, unloading, and hot air heating recovery treatment. After 20 cycles, the arc height of the local support area after stabilization is measured again. Cyclic support retention rate = (arc height after cycle / initial arc height) × 100%.

[0078] Table 1 shows the test results of Siro compact textiles from Examples 1-4 and Comparative Examples 1-3.

[0079] Table 1 Test results of Siro compact textiles from Examples 1-4 and Comparative Examples 1-3

[0080]

[0081] As shown in Table 1, compared with Example 1, the local arc height recovery rate, local thickness recovery rate, and cyclic support retention rate of Comparative Example 1 decreased; the local arc height recovery rate, local thickness recovery rate, and cyclic support retention rate of Comparative Example 2 decreased; and the local arc height recovery rate, local thickness recovery rate, and cyclic support retention rate of Comparative Example 3 decreased.

[0082] This is because, in Comparative Example 1, without the introduction of shape memory polyurethane filaments, the local support area loses its thermally triggered active recovery source. After being compressed, it can only recover by the elastic rebound of the knitting coils and the residual shape of the heat-set structure, and cannot continuously output axial recovery stress. Therefore, the local arc height recovery rate and thickness recovery rate decrease. In Comparative Example 2, without the formation of thermal anchoring points, the shape memory polyurethane filaments can still recover when heated, but the recovery strain is mainly released through the free retraction of yarn segments and the slippage of coils. It is difficult to form a restricted and concentrated out-of-plane recovery in the local support area, resulting in a decrease in both the local arc height recovery rate and thickness recovery rate. In Comparative Example 3, without controlling the active strands to be located on the same technical plane, the active recovery directions of each knitting row in the local support area are inconsistent. When heated, the eccentric recovery of some coils cancels each other out, resulting in a decrease in the local arc height recovery rate and thickness recovery rate.

[0083] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for preparing a Siro compact textile fabric incorporating shape memory polymers, characterized in that, The preparation method includes: S1, Polycaprolactone diol and 4,4'-diphenylmethane diisocyanate are mixed and reacted to obtain an isocyanate-terminated prepolymer. 1,4-Butanediol is added to continue the reaction and curing. The mass ratio of polycaprolactone diol, 4,4'-diphenylmethane diisocyanate and 1,4-butanediol is (80-85):(40-46):(14-18) to obtain a thermoplastic shape memory polyurethane elastomer. The thermoplastic shape memory polyurethane elastomer is crushed into granules. The granules are added to a single-screw melt spinning mill and extruded to obtain nascent filaments. The nascent filaments are stretched and heat-set to obtain shape memory polyurethane filaments. S2, combed cotton staple fiber and low-melting-point core-sheath polyester staple fiber are mixed, opened, and then processed through drawing and roving processes to obtain A-strand roving. Combed cotton staple fiber is separately processed through drawing and roving processes to obtain B-strand roving. On a Siro compact spinning machine, A-strand roving and B-strand roving are fed in parallel for yarn forming to obtain eccentric active Siro compact yarn. The fiber bundle formed by drafting A-strand roving and introducing shape memory polyurethane filaments is the active strand, containing shape memory polyurethane filaments and low-melting-point core-sheath polyester staple fiber; the fiber bundle formed by drafting B-strand roving is the neutral strand. The active strand and the neutral strand are distributed side-by-side along the yarn axis. The low-melting-point core-sheath polyester staple fiber is a core-sheath composite staple fiber. The sheath layer is an isophthalic acid-modified copolyester with a melting point of 100-110℃, and the core layer is polyethylene terephthalate with a melting point of 255-260℃. The mass ratio of the sheath layer to the core layer is 1:

1. In the A-strand roving, the low-melting-point core-sheath polyester staple fiber has a length of 38mm and a linear density of 2.2dtex. The mass ratio of combed cotton staple fiber to low-melting-point core-sheath polyester staple fiber is 100:(5-12). S3, the eccentric active Siro compact yarn and the ordinary combed cotton Siro compact yarn with the same linear density but without shape memory polyurethane filament are separately packaged and woven in sections on a computer flat knitting machine. At the same time, the yarn needle entry direction is adjusted by the yarn guide so that the active strand is always located on the same technical surface of the fabric in each knitting row, and the fabric greige is obtained. The partitioned weaving refers to a partially supported area and a non-supported area. The basic structure of the partitioned weaving is 1+1 rib, double rib, or Milanese rib. The warp density of the fabric is 12-18 rows / cm, and the cross density is 10-16 rows / cm. The partially supported area is continuously woven for 20-60 rows and 15-40 stitches, using only the eccentric active Siro compact yarn. The non-supported area is woven using the ordinary combed cotton Siro compact yarn. S4, the fabric greige is covered on the surface of the arc mold for heat setting, and then the heat-set fabric greige is laid flat with the technical side of the active strand facing the hot pressing mold to form a heat anchor point, thus obtaining the fabric. The fabric is then subjected to a flat pressure load, and after the load is removed, it is heated with hot air to obtain a Siro compact textile with shape memory polymer.

2. The method for preparing a Siro compact textile fabric incorporating shape memory polymers according to claim 1, characterized in that, In S1: The temperatures of each section of the single-screw melt spinning machine are as follows: feeding section 155-165℃, compression section 170-180℃, metering section 175-185℃, and spinning assembly temperature 180-190℃.

3. The method for preparing a Siro compact textile fabric incorporating shape memory polymers according to claim 1, characterized in that, In S1: The extrusion parameters include a speed of 2.5-4.0 m / min and the use of a three-hole spinneret with an aperture of 0.25-0.35 mm and an aspect ratio of (3-4):

1.

4. The method for preparing a Siro compact textile fabric incorporating shape memory polymers according to claim 1, characterized in that, In S2: The linear density of the A-strand roving is 500-650 tex; The linear density of the B-strand roving is 500-650 tex.

5. The method for preparing a Siro compact textile fabric incorporating shape memory polymers according to claim 1, characterized in that, In S2: The yarn forming process involves introducing the shape memory polyurethane filament in front of the drafting zone of the A-strand roving, with an overfeed rate of 0.5-2.0%, a feed tension of 0.05-0.20 cN / dtex, a draft ratio of 28-36, a negative pressure of 1.8-2.8 kPa, a front roller output speed of 14-18 m / min, a spindle speed of 11000-14000 r / min, and a yarn twist of 650-780 twists / m. The linear density of the eccentric active Siro compact yarn is 18-24 tex.

6. The method for preparing a Siro compact textile incorporating shape memory polymer according to claim 1, characterized in that, In S4: The heat setting temperature is 110-125℃, and the time is 2-5 minutes. The hot pressing temperature is 110-125℃, the pressure is 0.15-0.35 MPa, and the time is 5-12 seconds. After hot pressing, hot anchor points are formed. The hot anchor points are either dot-shaped or short line-shaped. The outer circle diameter of the dot-shaped hot anchor point is 0.8-2.5 mm, the length of the short line-shaped hot anchor point is 0.8-2.5 mm, and the distance between adjacent hot anchor points is 3-8 mm.

7. A Siro compact textile incorporating shape memory polymers, characterized in that, It is prepared by the preparation method described in any one of claims 1-6.

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