A stretch color-changing negative poisson's ratio fabric, its preparation method and application

Abstract

The application discloses a tensile color-changing negative Poisson's ratio fabric and a preparation method and application thereof. A tensile color-changing mixed solution is coated on the surface of a negative Poisson's ratio yarn, and the fabric warp and weft yarn raw materials are obtained after drying, so that the fabric with reversible tensile color-changing effect and significant negative Poisson's ratio effect is obtained. Meanwhile, the fabric has good structure and performance stability, and still maintains the color-changing effect and negative Poisson's ratio effect after repeated tensile action for many times, and has a good application prospect in human motion intelligent monitoring sensors.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of textiles, and relates to a tensile color-changing negative Poisson's ratio fabric, a preparation method and application thereof. BACKGROUND

[0002] The tensile color-changing fabric can rapidly change color under external force, realize real-time perception of the external environment, and has good durability. Compared with electrochromic fabric, the tensile color-changing fabric does not require an external power supply, and its color change is realized through a physical mechanism, which is more convenient and environmentally friendly. At the same time, the tensile color-changing fabric is suitable for many fields such as clothing, smart textiles, sports equipment, etc., which is conducive to improving the innovation and interest of design.

[0003] Chinese patent publication No. CN115480324A discloses a preparation method of an intelligent photonic crystal fabric with tensile color-changing function. The invention obtains the intelligent photonic crystal textile fabric with tensile color-changing function by controlling the uniformity and particle size of the nano microspheres.

[0004] Chinese patent publication No. CN108950850A discloses a manufacturing method of a tensile color-changing polyester-cotton-spandex blended knitted fabric. The invention first prepares color-changing spandex fibers as first and third yarns, then prepares spandex-coated polyester yarns as second yarns, and finally uses the first, second and third yarns to prepare the tensile color-changing polyester-cotton-spandex blended knitted fabric in a warp knitting structure.

[0005] Chinese patent publication No. CN115710354A discloses a liquid crystal elastomer composite film, a preparation method and application thereof. The invention dissolves liquid crystal monomers, cross-linking agents and chain extenders in an organic solvent, mixes them uniformly, and then adds an ionic liquid to form a mixed solution. Then, the cross-linking reaction is initiated. The composite film has a concave-convex structure on the surface by introducing an ionic liquid, has a color-changing function under tensile conditions, and has good electrical conductivity and mechanical properties.

[0006] Chinese patent publication No. CN114149544A discloses a viscous photonic crystal hydrogel sensor, a preparation method and application thereof. The invention dissolves and disperses some reagents and cross-linking agents in a solvent, adds a graphene dispersion liquid and an initiator to prepare a prepolymerization solution, fills the photonic crystal with the prepolymerization solution, and polymerizes under ultraviolet light to obtain the viscous photonic crystal hydrogel sensor. The sensor is used for human motion monitoring, does not need to use an external power supply, has sensitive tensile color-changing performance and electrical signal changing performance, has good viscosity, can closely adhere to the skin and is not easy to fall off, improves the accuracy of motion monitoring, and can be used for underwater wearing.

[0007] The Chinese patent publication No. CN20512565U discloses a stretch color-changing fabric. The stretch color-changing fabric comprises a base layer and a stretch color-changing film layer arranged on the base layer. The stretch color-changing film layer is made of hydroxyl silicone, and the base layer is formed by interweaving warp yarns and weft yarns. The stretch color-changing film layer is arranged on the base layer to realize the color-changing function when the fabric is stretched.

[0008] In summary, the stretch color-changing fabric in the prior art is generally formed by combining a fabric base with a color-changing layer. The color-changing stability, washing resistance, air permeability, comfort, safety and applicability of the fabric are limited, which is not conducive to the basic application advantages of the fabric, such as softness, high elasticity and air permeability. SUMMARY

[0009] The present application provides a stretch color-changing negative Poisson's ratio fabric, a preparation method and application thereof.

[0010] In one aspect of the present application, a preparation method of a stretch color-changing negative Poisson's ratio fabric is provided, which comprises the following steps:

[0011] Step 1: polypropylene powder is added to a polydimethylsiloxane solution, and stirred uniformly to obtain a milky white suspension;

[0012] Step 2: dye is added and stirred uniformly to obtain a stretch color-changing mixed solution;

[0013] Step 3: the stretch color-changing mixed solution is coated on the surface of a negative Poisson's ratio yarn and left to stand;

[0014] Then, the yarn is placed in an oven for drying and curing to obtain a stretch color-changing coated negative Poisson's ratio yarn.

[0015] Step 4: the prepared stretch color-changing coated negative Poisson's ratio yarn is used as warp and weft yarns, and a stretch color-changing negative Poisson's ratio fabric is obtained by weaving.

[0016] In another aspect of the present application, a stretch color-changing negative Poisson's ratio fabric is provided, which is prepared by the above method.

[0017] In still another aspect of the present application, the above stretch color-changing negative Poisson's ratio fabric is applied in human health monitoring.

[0018] Advantages of the present application:

[0019] The stretch color-changing mixed solution is coated on the surface of a negative Poisson's ratio yarn to prepare a stretch color-changing coated negative Poisson's ratio yarn. The yarn is used to prepare a fabric with both stretch color-changing effect and negative Poisson's ratio effect. Under the action of tension, the fabric rapidly changes from colored to nearly white, and returns to the color before stretching when the tension is removed.

[0020] Meanwhile, the fabric has good structure and performance stability, and still maintains the color change effect and negative Poisson's ratio effect after repeated stretching, and has good application prospect in human motion intelligent monitoring sensor.

[0021] In addition, the tensile color-changing solution is simple to prepare, and the raw materials used are conventional materials; the tensile color-changing coating structure does not affect the tensile elasticity of the yarn and fabric, the fabric has good elasticity and air permeability; the fabric can be repeatedly stretched, the color change effect is reversible, general fabric organization structure can be selected, the pattern effect and color change effect are matched to double the appearance of the fabric, which helps to enrich the style, functionality, personalized design and added value of the fabric. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Figure 1 is a tensile color-changing negative Poisson's ratio fabric tensile before and after the shape structure diagram;

[0023] Figure 2 Figure 4 is a fabric Poisson's ratio-strain curve diagram. DETAILED DESCRIPTION

[0024] The application will be further described below in conjunction with the drawings. The following examples are only used to more clearly illustrate the technical solutions of the application, and cannot be used to limit the protection scope of the application.

[0025] The embodiment of the application provides a specific preparation step of a tensile color-changing fabric, which is specifically as follows:

[0026] 1) The polydimethylsiloxane solution (PDMS) is uniformly mixed by the A and B components in the Dow Corning SYLGARD 184 silicone rubber at a weight ratio of 10:1, and stirred until a large amount of bubbles are generated.

[0027] 2) The 2.5um microspherical polypropylene powder (PP) is added to the PDMS and stirred uniformly to obtain a milky white suspension.

[0028] 3) The dye is added and stirred uniformly to obtain a tensile color-changing mixed solution.

[0029] 4) The tensile color-changing mixed solution is coated on the surface of the negative Poisson's ratio yarn, left to stand for 30 min, and then placed in an oven at a temperature of 60°C for 30 min to dry and cure, to obtain a tensile color-changing coating structure negative Poisson's ratio yarn.

[0030] 5) The tensile color-changing negative Poisson's ratio yarn prepared is used as the weft yarn 1 raw material, and the polyester is used as the warp yarn 2, and a tensile color-changing negative Poisson's ratio fabric is obtained by weaving, as shown in Figure 1 .

[0031] Further, the tensile color-changing mixed solution is composed of a polydimethylsiloxane solution, a polypropylene powder and a blue dye, and the mixing ratio of the three is 1:1:20.

[0032] Further, the surface coating thickness of the negative Poisson's ratio yarn is in the range of 0.6 mm.

[0033] The embodiment of the present application also provides a tensile color-changing negative Poisson's ratio fabric, which is obtained by coating a tensile color-changing mixed solution on the surface of a negative Poisson's ratio yarn and drying the yarn to be used as the warp and weft yarns of a fabric, so as to obtain a fabric with reversible tensile color-changing effect and significant negative Poisson's ratio effect.

[0034] The fabric provided by the above embodiment has good structure and performance stability, and still maintains the color-changing effect and the negative Poisson's ratio effect after repeated tensile action for many times (more than 100 times). The tensile color-changing effect of the fabric is reversible, and the fabric presents a rapid change from colored to nearly white under the action of tension; when the tension is removed, the fabric returns to the color before stretching. After repeated tensile action for many times, the fabric still has the tensile color-changing effect and the negative Poisson's ratio effect.

[0035] For example, as shown in Figure 1 , the color of the fabric rapidly changes from blue to nearly white with the increase of tensile stress, and the obvious color-changing range is 5%-40% of elongation, and the fabric returns to the initial state when the stress is removed. At the same time, the negative Poisson's ratio yarn is bent and deformed under the action of tension, and the fabric presents a negative Poisson's ratio effect, and the maximum negative Poisson's ratio value is -2.1, as shown in Figure 2 .

[0036] As another embodiment, the fabric provided by the present application can also be applied to human health monitoring, and has the advantages of high conformability and high stability.

[0037] The above description is only the preferred embodiment of the present application, and it should be pointed out that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A method for preparing a stretch-sensitive color-changing negative Poisson's ratio fabric, characterized in that, The method includes the following steps: Step 1: Add polypropylene powder to polydimethylsiloxane solution and stir until homogeneous to obtain a milky white suspension; Step 2: Add dye and stir well to obtain a stretch-color-changing mixed solution; Step 3: Apply the stretching and color-changing mixed solution to the surface of the negative Poisson's ratio yarn and let it stand; Then place it in an oven to dry and cure, and you will get a stretch-color-changing coated negative Poisson's ratio yarn; Step 4: Use the prepared stretch-color-changing coating structure negative Poisson's ratio yarn as warp and weft yarn raw materials, and weave it to obtain a stretch-color-changing negative Poisson's ratio fabric; the stretch-color-changing effect of the stretch-color-changing negative Poisson's ratio fabric is reversible; under tension, the fabric exhibits a rapid change from colored to nearly white; when the tension is removed, the fabric returns to its unstretched color.

2. The method for preparing a stretch-sensitive color-changing negative Poisson's ratio fabric according to claim 1, characterized in that, The polydimethylsiloxane solution is obtained as follows: Mix components A and B of Dow Corning SYLGARD 184 silicone rubber in a weight ratio of 10:1 and stir until a large number of bubbles are generated.

3. The method for preparing a stretch-sensitive color-changing negative Poisson's ratio fabric according to claim 1, characterized in that, The polypropylene powder is 2.5 μm microspheres.

4. A method for preparing a stretch-sensitive color-changing negative Poisson's ratio fabric according to claim 1 or 3, characterized in that, The mass ratio of polydimethylsiloxane solution, polypropylene powder, and dye in the stretching color-changing mixed solution is 1:1:15 to 1:1:

35.

5. A method for preparing a stretch-sensitive color-changing negative Poisson's ratio fabric according to any one of claims 1 to 3, characterized in that, The surface coating thickness of negative Poisson's ratio yarn ranges from 0.2 to 1 mm.

6. A stretch-sensitive color-changing negative Poisson's ratio fabric, prepared by the method of any one of claims 1 to 5.

7. The application of a stretch-sensitive color-changing negative Poisson's ratio fabric according to claim 6 in human health monitoring.

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