Passive continuous refrigeration fabric and preparation method thereof

Abstract

The invention belongs to the technical field of textiles, and particularly discloses a passive continuous refrigeration fabric and a preparation method thereof. The fabric comprises a first weaving unit which is arranged on the bottommost layer of the fabric and has a plain weave structure; the second weaving unit is arranged on the upper surface of the first weaving unit and comprises a plurality of groups of parallel wrinkle raised lines; and the third weaving unit is arranged between the first weaving unit and the second weaving unit and connects the wrinkle raised lines with the first weaving unit. The passive fabric capable of continuously refrigerating has good air permeability, an ultraviolet-proof function and a remarkable cooling effect, the air permeability can reach 581 mm / s, the UPF can reach 800 +, the maximum temperature difference can reach 15.1 DEG C, the lasting time of the temperature lower than 27 DEG C is 60 min, the refrigerating time of the fabric is greatly prolonged, and the fabric is beneficial to keeping a cool state of a body.

Description

Technical Field

[0001] The present invention belongs to the technical field of textiles, and particularly relates to a fabric with passive continuous refrigeration and a preparation method thereof. Background Art

[0002] Existing cold-sensation fabrics mainly rely on phase-change materials, high-reflection coatings, or increasing the weaving density of fabrics to block heat penetration to achieve heat insulation effects. However, most of these methods have limitations in terms of persistence, environmental protection, or breathability. Among them: Adding phase-change materials to fabrics or fibers has limited heat storage capacity (usually ≤200 J / g) and cannot cope with long-term outdoor exposure to the sun. High-reflection coatings are not wash-resistant, and the coatings are prone to failure due to washing abrasion, and the addition of coatings affects breathability, so they are not suitable for the process of summer clothing fabrics. Currently, some summer clothing adopts active cooling technologies, such as miniature fans or semiconductor refrigeration, which will consume energy and are not suitable for long-term outdoor activities. At the same time, due to the addition of electrical components, the requirements for washing are high, which does not conform to the characteristics of frequent washing of summer clothing, and will also increase the weight of equipment, which does not meet the lightweight outdoor requirements. If the density of the fabric is increased and static structure fabrics are used to block heat penetration, it is difficult to meet the dynamic requirements of "reflection - heat dissipation", and it will also inhibit the evaporation of sweat, resulting in the accumulation of humidity and heat in the microenvironment. Currently, the general choice of outdoor sports functional fabrics on the market is mainly nylon or polyester materials. During actual wearing, there are generally problems such as short cold-sensation maintenance time and weak cold-sensation.

[0003] Therefore, existing cold-sensation fabrics still face technical problems such as low fabric cooling power, short cold-sensation duration, and not being suitable for long-term outdoor sports. When the fabric absorbs heat, instead of dissipating heat through heat conduction, it absorbs heat and stores a large amount of heat, becoming a new heat source. At the same time, for existing outdoor fabrics, in order to achieve lightweight, the weaving density is increased to meet the requirements of resisting heat sources such as ultraviolet rays outdoors, resulting in poor breathability of the fabric and causing stuffy discomfort. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. For this purpose, the present invention provides a fabric with passive continuous refrigeration and a preparation method thereof. The fabric can effectively reduce the body sensation temperature and extend the continuous refrigeration time.

[0005] The inventive concept of the present invention is as follows: The passive sustainable cooling fabric of the present invention adopts a multi-layer structure of base-lined parallel folds, which is composed of three functionally complementary knitting units. Each unit achieves a collaborative cooling effect through differential yarn configuration and knitting process. Among them: The first knitting unit as the basic support layer is knitted with the first yarn having a high specific heat capacity. When knitted, the bottom is a flat structure. Due to the characteristics of this yarn, it can quickly conduct skin heat and at the same time absorb the heat accumulated in the clothing through an energy storage mechanism, forming a preliminary thermal buffer layer. The second knitting unit as the radiation shielding layer is located at the top layer, including multiple groups of parallel pleated ridges, and is knitted with the second yarn having a bionic silver ant morphology. This yarn is mixed with a polyaniline conjugated polymer, which can reflect more than 97% of ultraviolet radiation light. At the same time, the microchannels formed by the opening and closing of the folds can enhance air convection. The third knitting unit as the dynamic adjustment layer is a connecting structure knitted with the third yarn of temperature-sensitive polymer fibers, and adopts a knitting method of one-fourth needle out, embedding the fold fulcrum into the first knitting unit. The third knitting unit can deform according to temperature changes, and this thermally induced telescopic effect will change the angle between the folds and the first knitting unit, realizing adaptive opening and closing adjustment. During the process of rising body temperature, the first knitting unit first conducts heat and stores energy; when the heat storage is saturated, the third knitting unit triggers the opening and closing of the folds, and the radiation shielding structure of the second knitting unit unfolds, accelerating the evaporation of sweat through forced convection, forming a composite cooling effect.

[0006] To solve the above technical problems, a first aspect of the present invention provides a fabric, comprising:

[0007] A first knitting unit, disposed at the bottommost layer of the fabric, having a plain weave structure;

[0008] A second knitting unit, disposed on the upper surface of the first knitting unit, including multiple groups of parallel pleated ridges; and

[0009] A third knitting unit, disposed between the first knitting unit and the second knitting unit, and connecting the pleated ridges with the first knitting unit.

[0010] In some embodiments of the present invention, the distance between adjacent pleated ridges is 5 - 7 mm.

[0011] In some embodiments of the present invention, the raised height of the pleated ridges is 4 - 6 mm.

[0012] In some embodiments of the present invention, the width of the pleated ridges is 3 - 5 mm.

[0013] In some embodiments of the present invention, the angle formed between the pleated ridges and the first knitting unit is 0 - 50°, preferably 30 - 50°.

[0014] In some embodiments of the present invention, the first braiding unit is braided with a first yarn, and the preparation raw materials of the first yarn include a high specific heat capacity masterbatch and polyamide, and the mass ratio of the high specific heat capacity masterbatch to polyamide is (10 - 20):(80 - 90); the specific heat capacity of the high specific heat capacity masterbatch is not less than 3.5 J / (g·K).

[0015] In some embodiments of the present invention, the specific heat capacity of the high specific heat capacity masterbatch is 3.5 - 4.0 J / (g·K).

[0016] In some embodiments of the present invention, the high specific heat capacity masterbatch is an alumina and / or lanthanum oxide filled polyamide masterbatch.

[0017] In some embodiments of the present invention, the preparation method of the first yarn comprises the following steps:

[0018] (1) Melt preparation: Premix the high specific heat capacity masterbatch and polyamide chips in a dry nitrogen environment, and melt and blend them through a segmented temperature-controlled screw extruder to obtain a melt;

[0019] (6) Spinning: After filtration through a melt filter, the melt is then transported, pressurized, and metered by a metering pump, and extruded and formed through dumbbell-shaped spinneret holes to obtain an undrawn yarn; the aspect ratio of the spinneret hole is 1.35:1; the side blowing temperature is 18°C ± 0.5°C, the wind speed is 0.3 m / s ± 5%, and the relative humidity is 65% ± 3%;

[0020] (3) Air drawing: Draw the undrawn yarn, set the air pressure to 1.63 bar ± 0.05 bar, and the draw ratio during the drawing process is 3.5 times; the air drawing process enables the fiber crystallinity to reach 65 - 72%, the orientation factor ≥ 0.85, and a 1.3 wt% composite antistatic oil agent is applied after drawing;

[0021] (4) Winding and forming: Wind it into a bobbin at a linear speed of 4130 m / min ± 50 m / min to obtain a profiled cross-section fully drawn yarn of 20 - 100 D, that is, the first yarn.

[0022] In some embodiments of the present invention, the second braiding unit is braided with a second yarn having a biomimetic silver ant morphology, and the preparation raw materials of the second yarn include a polyaniline conjugated polymer and polyamide, and the mass ratio of the polyaniline conjugated polymer to polyamide is (5 - 10):(90 - 95).

[0023] In some embodiments of the present invention, the polyaniline conjugated polymer includes aniline.

[0024] In some embodiments of the present invention, the preparation method of the second yarn comprises the following steps:

[0025] (1) Melt preparation: Premix the polyaniline conjugated polymer and polyamide chips in a dry nitrogen environment, and then enter a screw extruder for melt blending to obtain a melt;

[0026] (2) Spinning: The melt is extruded through a triangular spinneret hole to form an initially drawn filament; the side length of the hole is 50 - 80 μm, and the apex angle is 60° ± 2°.

[0027] (3) Cooling air blowing: Implement gradient cooling using a side air blowing system, with the parameter control being a temperature of 18°C ± 0.5°C, a wind speed of 0.3 m / s ± 5%, and a humidity of 65% ± 3%;

[0028] (4) Air drawing: Perform air drawing at a drawing ratio of 2.5 times with a pressure of 1.6 bar ± 0.05 bar, and apply a composite antistatic oil agent of 1.3 wt% after drawing;

[0029] (5) Winding and forming: Wind into a bobbin at a linear speed of 4130 m / min ± 50 m / min to obtain profiled cross-section fully oriented yarns of 20 - 100 D, namely the second yarn.

[0030] In some embodiments of the present invention, the raw material components of the composite antistatic oil agent include, by percentage: mineral oil (viscosity at room temperature 80 s) 45%, castor oil polyoxyethylene ester 18%, non-ionic surfactant 10%, diethanolammonium dodecyl phosphate 25%, antistatic agent SN (octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate) 2%.

[0031] In some embodiments of the present invention, the third weaving unit is woven using the third yarn, and the third yarn is a temperature-changing polymer yarn, and the temperature-changing polymer yarn includes polyester fiber and / or polyamide fiber.

[0032] The second aspect of the present invention provides a method for preparing the above-mentioned fabric, including the following steps:

[0033] Weave a plain structure using the first yarn to obtain the first weaving unit;

[0034] Weave a three-dimensional pleated structure using the second yarn to obtain the second weaving unit;

[0035] Connect the first weaving unit and the second weaving unit using the third yarn to form a third weaving unit, thereby obtaining the fabric.

[0036] In some embodiments of the present invention, when weaving the first weaving unit, all the needles on the upper needle bed and the lower needle cylinder of the loom are fully needled out, and 3 - 5 cycles of weaving are performed to form a plain structure of rib tissue.

[0037] In some embodiments of the present invention, when the second knitting unit is knitted, the surface layer and the bottom layer start to be separated and loop independently. All the knitting needles on the lower cylinder knit with full needles, completing single-sided knitting for 6 - 10 cycles. The knitting needles on the upper dial use a one-half knitting process, knitting with a length twice that of the loops knitted on the lower cylinder for 3 - 5 cycles to form three-dimensional wrinkles.

[0038] Since the number of loops formed by the surface layer and the bottom layer is different, the number of wale courses of the upper layer is more, and that of the lower layer is less. As a result, the upper layer accumulates to form three-dimensional wrinkles with a surface layer / bottom layer density gradient ratio of (3 - 5):1, while the corresponding lower layer loops are sparse, forming a breathable area.

[0039] In some embodiments of the present invention, when the third knitting unit is knitted, the upper dial of the knitting machine uses a one-quarter knitting process, with only one needle out of every four knitting needles, and the corresponding positions on the lower cylinder knit with full needles. The third yarn is interwoven between the upper layer and the lower layer, connecting the second knitting unit and the first knitting unit through connection points.

[0040] The third yarn is a temperature-effect yarn, and its shrinkage rate changes with temperature. When the temperature reaches the set threshold, the yarn length elongates by 12 - 15%, resulting in a weakened connection between the wrinkled area of the second knitting unit and the first knitting unit, driving a change in the angle between the wrinkled surface and the base surface, and forming a three-dimensional microchannel array with a certain height. This structure is conducive to the emission of body heat and the evaporation of sweat. At the critical position where the first knitting unit and the second knitting unit are interwoven, due to the special structure of the second yarn, it acts as a capillary conduit, quickly draining the sweat from the fabric of the second knitting unit to the wrinkled position for evaporation, thus playing a refrigerating role.

[0041] The above technical solutions of the present invention, compared with the prior art, have at least the following technical effects or advantages:

[0042] (1) The passive sustainable refrigeration fabric of the present invention includes a first knitting unit with a plain weave structure provided at the bottom layer, a second knitting unit composed of multiple groups of parallel wrinkled ridges, and a third knitting unit connecting the wrinkled ridges and the first knitting unit. Each unit achieves a synergistic refrigeration effect through different yarn configurations and knitting processes. Through the design of this multi-layer structure with a base-lined parallel wrinkles, when the fabric absorbs heat, in the initial heat load stage, first, the first knitting unit absorbs and stores heat through the first yarn with a high specific heat capacity, slowing down the fabric heating rate. At the same time, the first yarn with high thermal conductivity establishes an axial heat conduction path. When the heat storage reaches saturation, the breathable window of the fabric, that is, the wrinkled area, opens to form a structure similar to an exhaust window, releasing the heat discharged by the body, and at the same time accelerating the evaporation of sweat on the skin surface. Through the direct and indirect evaporation heat absorption of sweat, a part of the heat is taken away, realizing composite cooling.

[0043] (2) The fabric with passive sustainable refrigeration of the present invention has good air permeability, ultraviolet protection function, and significant cooling effect. It can achieve an air permeability of 581 mm / s, a UPF of 800+, a contact cool feeling coefficient Qmax of 0.24, a maximum temperature difference of 15.1 °C, and a duration of up to 60 minutes below 27 °C, greatly extending the refrigeration time of the fabric and helping to keep the body cool. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a schematic structural diagram of the fabric of the present invention;

[0045] Figure 2 is Figure 1 a schematic cross-sectional view of the cross-section in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The present invention will be specifically described below in conjunction with embodiments for the understanding of those skilled in the art in the relevant technical field. It is necessary to specifically point out here that the embodiments are only used to further illustrate the present invention and should not be construed as limiting the protection scope of the present invention. Those skilled in the art, based on the above-mentioned invention content, make non-essential improvements and adjustments to the present invention, which should still fall within the protection scope of the present invention. At the same time, for the raw materials not specifically described below, they are all commercially available products; the process steps or preparation methods not specifically mentioned are all process steps or preparation methods known to those skilled in the art.

[0047] As Figure 1 shown, the fabric of the present invention includes a first knitting unit 1, a second knitting unit 2, and a third knitting unit 3. Among them: the first knitting unit 1 is arranged at the bottom layer of the fabric and has a dense flat plain structure. The first knitting unit 1 is knitted with a first yarn, and the preparation raw materials of the first yarn include a high specific heat capacity masterbatch and polyamide in a mass ratio of (10-20):(80-90). Among them: the specific heat capacity of the high specific heat capacity masterbatch is not less than 2.5 J / (g·K), and it also has good thermal conductivity and specific heat capacity at the same time. This yarn can quickly conduct the heat of the skin and absorb the heat accumulated in the clothing through an energy storage mechanism to form a preliminary thermal buffer layer.

[0048] As Figure 2As shown in the figure, the second knitting unit 2 is disposed on the upper surface of the first knitting unit and is composed of multiple groups of parallel pleated ridges. The distance L between adjacent pleated ridges is 5-7 mm, the protruding height H of the pleated ridges is 4-6 mm, the width D of the pleated ridges is 3-5 mm, and the included angle α formed between the pleated ridges and the first knitting unit is 0-50°. The second knitting unit 2 is knitted with a second yarn having a bionic silver ant morphology. The preparation raw materials of the second yarn include polyaniline conjugated polymer and polyamide with a mass ratio of (5-10):(90-95), and can reflect more than 97% of ultraviolet radiation light. The microchannels formed by the opening and closing of the pleats of the second knitting unit 2 can enhance air convection.

[0049] The third knitting unit 3 is disposed between the first knitting unit 1 and the second knitting unit 2 to connect the pleated ridges with the first knitting unit 1. The third knitting unit 3 is knitted with a third yarn, and the third yarn is a temperature-changing polymer yarn, such as polyester fiber and / or polyamide fiber. The third knitting unit 3 adopts a knitting method of one-quarter needle out to embed the pleat fulcrum into the first knitting unit 1. The third knitting unit 3 can generate deformation according to temperature changes, and this thermally induced telescopic effect will change the angle between the pleats and the substrate to achieve adaptive opening and closing adjustment. During the process of increasing body temperature, the first knitting unit 1 first conducts heat and stores energy; when the heat storage is saturated, the third knitting unit 3 triggers the opening and closing of the pleats, and the radiation shielding structure of the second knitting unit 2 unfolds, accelerating the evaporation of sweat through forced convection to form a composite cooling effect.

[0050] Example 1

[0051] A fabric with passive sustainable refrigeration includes a first knitting unit, a second knitting unit, and a third knitting unit. Among them: the first knitting unit is disposed at the bottom layer of the fabric and has a dense and flat plain weave structure; the second knitting unit is disposed on the upper surface of the first knitting unit and is composed of multiple groups of parallel pleated ridges; the third knitting unit is disposed between the first knitting unit and the second knitting unit to connect the pleated ridges with the first knitting unit.

[0052] The preparation method of the above-mentioned fabric with passive sustainable refrigeration includes the following steps:

[0053] Preparation of the first yarn:

[0054] (1) Preparation of the melt: During spinning, at the raw material feeding device, a polyamide high specific heat capacity masterbatch filled with alumina and lanthanum oxide [15 wt%, specific heat capacity of 4.0 J / (g·K)] and polyamide chips (85 wt%) are premixed in a dry nitrogen environment, and then enter the screw extruder for melt blending and undergo high-temperature segmented melting; the screw extruder adopts five temperature zones, and the temperature gradient is set as: 249 °C, 254 °C, 262 °C, 265 °C, 269 °C.

[0055] (2) Spinning: The melt after being melted by the screw extruder is filtered through a melt filter, and then the metering pump conveys, pressurizes, and measures the melt. Finally, it is distributed through the spinning box body, reaches the spinneret plate, and is extruded and formed through dumbbell-shaped spinneret holes. The aspect ratio of the spinneret hole is 1.35:1; the major axis dimension of the dumbbell-shaped cross-section is 25 - 50 μm, and the minor axis is 18 - 37 μm.

[0056] (3) Cooling and blowing: Dry spinning is adopted. The extruded filament melt is cooled and dried and shaped by the side blowing device; the side blowing temperature is 18 °C, the wind speed is 0.3 m / s, and the relative humidity is 65%.

[0057] (4) Air drawing: The as-spun filament fiber after the above processing has low strength and large elongation. In order to improve the molecular chains, crystallinity, and orientation of the fiber, the as-spun filament needs to be drawn. The air pressure is set to 1.63 bar, and the draw ratio during the drawing process is 3.5 times. Generally, the larger the draw ratio, the greater the modulus of the fiber. Therefore, under the condition of ensuring that the softness of the fiber meets the wearing conditions, the ratio is set to 3.5. The drawn filament is called fully drawn yarn. The air drawing process makes the fiber crystallinity reach 65 - 72%, and the orientation factor ≥ 0.85. It can increase the contact area between the fiber and the object and the heat conduction performance; after drawing, a 1.3 wt% compound antistatic oil agent is applied [the raw material components include by percentage: mineral oil (viscosity at room temperature 80 s) 45%, castor oil polyoxyethylene ester 18%, non-ionic surfactant 10%, diethanolammonium dodecyl phosphate 25%, antistatic agent SN (octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate) 2%].

[0058] (5) Winding and forming: It is wound into a bobbin at a linear speed of 4130 m / min ± 50 m / min to obtain profiled cross-section fully oriented yarn with a fineness of 20 - 100 D, that is, the first yarn.

[0059] Preparation of the second yarn:

[0060] (1) Melt preparation: During spinning, aniline (8 wt%) and polyamide chips (92 wt%) are premixed in a dry nitrogen environment at the raw material feeding device, and then enter the screw extruder for melt blending through high-temperature staged melting; the screw extruder adopts five temperature zones, and the temperature gradient is set as: 235 °C, 239 °C, 245 °C, 248 °C, 252 °C.

[0061] (2) Spinning: The melt after being melted by the screw extruder is filtered through a melt filter, and then the metering pump conveys, pressurizes, and measures the melt. Finally, it is distributed through the spinning box body, reaches the spinneret plate, and is extruded and formed through triangular spinneret holes. The side length of the hole is 50 - 80 μm, and the apex angle is 60° ± 2°; the three-dimensional aspect ratio of the triangular spinneret hole is 2.8:1, and the surface roughness Ra of the hole channel ≤ 0.2 μm.

[0062] (3) Cooling and blowing: Using the dry spinning method, the extruded filament melt is subjected to gradient cooling and drying and shaping by a side blowing system; the side blowing temperature is 18°C ± 0.5°C, the wind speed is 0.3 m / s ± 5%, and the relative humidity is 65% ± 3%.

[0063] (4) Airflow drawing: The as-spun fiber after the above processing has low strength, and flexible drawing is used. Generally, the greater the drawing ratio, the greater the modulus of the fiber. Therefore, under the condition of ensuring the softness of the fiber, the ratio is set to 2.5. The friction coefficient between the fiber and the knitting needle during weaving is reduced, the wear of the knitting needle is reduced, and the product quality is improved. After drawing, the fiber crystallinity is 58 - 65%, and the orientation factor ≥ 0.82; after drawing, a 1.3 wt% compound antistatic oil agent (the same as the compound antistatic oil agent used in the preparation of the first yarn) is applied.

[0064] (5) Winding and forming: Winding into a bobbin at a linear speed of 4130 m / min ± 50 m / min to obtain profiled cross-section fully oriented yarn of 20 - 100 D, that is, the second yarn.

[0065] Weaving:

[0066] (1) Knitting the first knitting unit: Using the first yarn and a double needle bed jacquard machine, all the needles on the upper needle plate and the lower needle cylinder of the loom are fully extended to participate in knitting, forming a dense plain weave base structure of ribbed tissue, and completing 4 cycles of knitting;

[0067] (2) Knitting the second knitting unit: Using the second yarn, the surface layer and the bottom layer start to form loops independently. All the needles on the lower needle cylinder are fully extended to complete 8 cycles of single-sided knitting; the needles on the upper needle plate adopt a half-extension process, with twice the knitting loop length of the lower needle cylinder, and complete 4 cycles of knitting to form a three-dimensional fold with a surface layer / bottom layer density gradient ratio of 4:1;

[0068] (3) Knitting the third knitting unit: Using the third yarn polyester fiber, the upper needle plate of the loom adopts a quarter-extension process, with only one needle out of every four needles, and all the corresponding positions on the lower needle cylinder are fully extended. The third yarn is interwoven between the upper layer and the lower layer, connecting the parallel folds with the first knitting unit through the connection points.

[0069] Comparative Example 1

[0070] The difference between Comparative Example 1 and Example 1 is that the fabric of Comparative Example 1 only includes the first knitting unit.

[0071] Comparative Example 2

[0072] The difference between Comparative Example 2 and Example 1 is that the fabric of Comparative Example 2 is connected by the third yarn from two layers of the first textile unit.

[0073] Comparative Example 3

[0074] The difference between Comparative Example 3 and Example 1 is that the first yarn in Comparative Example 3 does not contain a high specific heat capacity masterbatch during preparation, and the second yarn does not contain an aniline conjugate polymer during preparation.

[0075] Comparative Example 4

[0076] The difference between Comparative Example 4 and Example 1 is that the fabric of Comparative Example 4 includes a first knitting unit and a second knitting unit, but the second knitting unit is knitted into a dense flat plain structure using the same knitting method as the first knitting unit, and then the first knitting unit and the second knitting unit are connected by a third yarn. That is, the fabric of Comparative Example 4 is a planar structure and does not have a wrinkled three-dimensional structure.

[0077] Performance Test

[0078] The fabrics prepared in Example 1 and Comparative Examples 1-4 were subjected to tests on the cooling effect, air permeability, and ultraviolet protection (UPF). Among them: The air permeability test was carried out according to the standard GB / T 5453-1997, and the test area was 20 cm 2 , and the test pressure was 100 Pa; the UPF test was carried out according to the standard GB / T 18830-2009. The cooling effect test was carried out according to the standard AATCC 201-2014 Textile Drying Rate Test Method. The test process was as follows: Three samples were taken from each fabric sample, with a size of 15×15 cm. Before the test, the samples were conditioned at 21±1°C and 65±2% relative humidity for 4 h. Before the test, the temperature of the metal plate was stabilized at 37±1°C, and the air flow on the metal plate was set at 1.5±0.5 m / s. The sample (width 73-74 inches, gram weight 135 g / m 2 ) was placed on the hot plate, and the side in contact with the skin was closely attached to the surface of the metal plate. The infrared thermal temperature probe on the device was placed in the middle of the sample, 1.0±0.1 cm away from the sample. During the test, 0.2±0.003 mL of water was dropped on the metal plate. The temperature was recorded every second after the test started until the temperature returned to the initial temperature. In the cool feeling test, the larger the value of the contact cool feeling coefficient Qmax, the stronger the cool feeling felt by the skin. The results are shown in Table 1.

[0079] Table 1:

[0080]

[0081] As can be seen from Table 1, the fabric prepared in Example 1 of the present invention has good air permeability, ultraviolet protection function, and significant cooling effect, achieving an air permeability of 581 mm / s, a UPF of 800+, a contact cool feeling coefficient Qmax of 0.24, a maximum temperature difference of 15.1 °C, and a duration of up to 60 min below 27 °C, which helps to keep the body in a cool state. Compared with Example 1, in Comparative Examples 1-4, due to the different fabric structures or raw materials for preparing the yarns, their air permeability, ultraviolet protection function, and cooling effect have all decreased significantly compared to Example 1.

[0082] For those of ordinary skill in the art to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made without the need for creative labor. Therefore, any simple improvements made by those skilled in the art based on the disclosure of the present invention should fall within the protection scope of the present invention. The above embodiments are the preferred embodiments of the present invention, and all processes similar to the present invention and equivalent changes made thereto shall fall within the protection scope of the present invention.

Claims

1. A fabric, characterized in that, Including: A first knitting unit, disposed at the bottom layer of the fabric, having a plain weave structure; A second knitting unit, disposed on the upper surface of the first knitting unit, including multiple groups of parallel pleated ridges; And A third knitting unit, disposed between the first knitting unit and the second knitting unit, connecting the pleated ridges to the first knitting unit.

2. The fabric according to claim 1, characterized in that, The distance between adjacent pleated ridges is 5 - 7 mm; and / or, the raised height of the pleated ridges is 4 - 6 mm; and / or, the width of the pleated ridges is 3 - 5 mm.

3. The fabric according to claim 1 or 2, characterized in that, The included angle formed between the pleated ridges and the first knitting unit is 0 - 50°.

4. The fabric according to claim 1, wherein The first knitting unit is knitted with a first yarn, and the preparation raw materials of the first yarn include a high specific heat capacity masterbatch and polyamide, and the mass ratio of the high specific heat capacity masterbatch to polyamide is (10 - 20):(80 - 90); the specific heat capacity of the high specific heat capacity masterbatch is not less than 3.5 J / (g·K).

5. The fabric according to claim 1, wherein The second knitting unit is knitted with a second yarn, and the preparation raw materials of the second yarn include a polyaniline conjugated polymer and polyamide, and the mass ratio of the polyaniline conjugated polymer to polyamide is (5 - 10):(90 - 95).

6. The fabric according to claim 1, wherein The third knitting unit is knitted with a third yarn, and the third yarn is a temperature - sensitive polymer yarn, and the temperature - sensitive polymer yarn includes polyester fiber and / or polyamide fiber.

7. A method for preparing a fabric according to any one of claims 1-6, characterized in that, Including the following steps: Knitting a plain weave structure with the first yarn to obtain a first knitting unit; Knitting a three - dimensional pleated structure with the second yarn to obtain a second knitting unit; Connecting the first knitting unit and the second knitting unit with the third yarn to form a third knitting unit, thereby obtaining the fabric.

8. The method for preparing the fabric according to claim 7, wherein When knitting the first knitting unit, all the needles of the upper needle disc and the lower needle cylinder of the knitting machine are full - needle out - needles, and 3 - 5 cycles of knitting are performed to form a plain weave structure of ribbed tissue.

9. The method for preparing the fabric according to claim 7, wherein, When knitting the second knitting unit, the surface layer and the bottom layer start to be separated and independently form loops. All the knitting needles of the lower needle cylinder are full - needle out - needles, and 6 - 10 cycles of single - side knitting are completed; the knitting needles of the upper needle disc adopt a half - needle out - needle process, with twice the knitting coil length of the lower needle cylinder, and 3 - 5 cycles of knitting are completed to form a three - dimensional pleat.

10. The method for preparing the fabric according to claim 7, characterized in that, When knitting the third knitting unit, the upper needle disc of the knitting machine adopts a quarter - needle out - needle process, the corresponding positions of the lower needle cylinder are all full - needle out - needles, and the third yarn is interwoven between the upper layer and the lower layer to connect the second knitting unit to the first knitting unit.

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