Tensile discoloring negative Poisson's ratio fabric and preparation method and application thereof

Abstract

The invention discloses a tensile discoloring negative Poisson's ratio fabric as well as a preparation method and application thereof. According to the method, the surface of the negative Poisson's ratio yarn is coated with the stretch discoloration mixed solution, the negative Poisson's ratio yarn is dried and then used as a fabric warp / weft yarn raw material, and the fabric with the reversible stretch discoloration effect and the remarkable negative Poisson's ratio effect is obtained. Meanwhile, the fabric has better structure and performance stability, still keeps the color change effect and the negative Poisson's ratio effect after being repeatedly stretched for multiple times, and has a good application prospect in the aspect of human motion intelligent monitoring sensors.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles and relates to a stretch-discoloration negative Poisson's ratio fabric and a preparation method and application thereof. Background Art

[0002] Stretch color-changing fabrics can change color rapidly under the action of external force, realize real-time perception of the external environment, and have good durability. Compared with electrochromic fabrics, stretch color-changing fabrics do not require external power supply, and their color change is achieved through physical mechanism, which is more convenient and environmentally friendly. At the same time, stretch color-changing fabrics are suitable for many fields such as clothing, smart textiles, sports equipment, etc., which is conducive to improving the innovation and fun of design.

[0003] Chinese patent publication number: CN115480324A, discloses a method for preparing smart photonic crystal fabrics with stretch color-changing function. The invention obtains stretch color-changing smart photonic crystal textile fabrics by controlling the uniformity and particle size of nano-microspheres.

[0004] Chinese patent publication number: CN108950850A, discloses a method for preparing a stretch color-changing polyester-cotton-spandex blended knitted fabric. The invention first prepares color-changing spandex fiber and uses it as the first yarn and the third yarn, then prepares spandex-coated polyester yarn and uses it as the second yarn, and adopts a warp knitting structure to prepare a stretch color-changing polyester-cotton-spandex blended knitted fabric grey cloth from the first yarn, the second yarn and the third yarn.

[0005] Chinese patent publication number: CN115710354A, discloses a liquid crystal elastomer composite film and its preparation method and application. The invention dissolves liquid crystal monomers, crosslinking agents and chain extenders in an organic solvent, mixes them evenly, and then continues to add ionic liquids to mix evenly to form a mixed liquid; then initiates a crosslinking reaction; by introducing ionic liquids, the composite film has a concave-convex structure on the surface of the liquid crystal elastomer composite film, has a color-changing function under stretching conditions, and has good conductivity and mechanical properties.

[0006] China Patent Publication No.: CN114149544A, discloses a viscous photonic crystal hydrogel sensor and its preparation method and application. The invention dissolves and disperses some reagents and crosslinking agents in a solvent, adds graphene dispersion and initiator, prepares a prepolymer solution; fills photonic crystals with the prepolymer solution; polymerizes under ultraviolet light to obtain a viscous photonic crystal hydrogel sensor. It is used for human motion monitoring, does not require the use of an external power supply, has sensitive tensile color change performance and electrical signal change performance; and has good viscosity, can fit closely to the skin, is not easy to fall off, and improves the accuracy of motion monitoring, and can also be used for underwater wear.

[0007] Chinese patent publication number: CN20512565U discloses a stretch color-changing fabric, which includes a base layer and a stretch color-changing film layer arranged on the base layer, wherein the stretch color-changing film layer is made of hydroxy silicone, and the base layer is interwoven with warp yarns and weft yarns. By arranging the stretch color-changing film layer on the base layer, the color-changing function of the fabric when stretched is realized.

[0008] In summary, the stretch color-changing fabrics in the prior art are mostly composed of a fabric base and a color-changing layer. Their color-changing stability, washability, breathability, comfort, safety and applicability all have certain limitations, which is not conducive to giving full play to the basic application advantages of the fabric itself, such as softness, high elasticity and breathability. Summary of the invention

[0009] In view of the deficiencies in the prior art, the present invention provides a stretch-chromatic negative Poisson's ratio fabric and a preparation method and application thereof.

[0010] In one aspect of the present invention, a method for preparing a stretch-chromatic negative Poisson's ratio fabric is provided, comprising the following steps: Step 1, adding polypropylene powder to polydimethylsiloxane solution, stirring evenly to obtain a milky suspension; Step 2, adding dye and stirring evenly to obtain a stretching color-changing mixed solution; Step 3, coating the tensile color-changing mixed solution on the surface of the negative Poisson's ratio yarn and allowing it to stand; Then, the yarn is placed in an oven to dry and solidify, thereby obtaining a tensile color-changing coating structure negative Poisson's ratio yarn; Step 4: Use the prepared stretch-chromic coating structured negative Poisson's ratio yarn as warp and weft yarn raw materials, and weave the stretch-chromic negative Poisson's ratio fabric.

[0011] Another aspect of the present invention provides a stretch-chromatic negative Poisson's ratio fabric, which is prepared by the above method.

[0012] Another aspect of the present invention provides an application of the above-mentioned stretch-chromic negative Poisson's ratio fabric in human health monitoring.

[0013] Beneficial effects of the present invention: The present invention coats the tensile color-changing mixed solution on the surface of the negative Poisson's ratio yarn to prepare the tensile color-changing coating structure negative Poisson's ratio yarn. The yarn is used to prepare a fabric with both tensile color-changing effect and negative Poisson's ratio effect. Under the action of tension, the fabric shows a rapid transition from colored to nearly white. When the tension is removed, the fabric returns to the color before stretching.

[0014] At the same time, the fabric has good structural and performance stability. After repeated stretching, it still maintains the color-changing effect and negative Poisson's ratio effect, and has good application prospects in intelligent human motion monitoring sensors.

[0015] In addition, the stretch color-changing solution of the present invention is simple to prepare, and the raw materials used are all conventional materials; the stretch color-changing coating structure does not affect the stretching elasticity of yarns and fabrics, and the fabrics have good elasticity and air permeability; the fabrics can be stretched repeatedly, the color-changing effect is reversible, and general fabric structures can be selected. The combination of pattern effect and color-changing effect has a double enhancement effect on the appearance of the fabric, which helps to enrich the style, functionality, personalized design and added value of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the morphological structure diagram of the tensile discoloration negative Poisson's ratio fabric before and after stretching; Figure 2 This is the Poisson's ratio-strain curve of the fabric. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention. The embodiment of the present application provides a specific preparation step of a stretched color-changing fabric, which is as follows: 1) Polydimethylsiloxane solution (PDMS) is prepared by mixing components A and B in Dow Corning SYLGARD 184 silicone rubber in a weight ratio of 10:1 and stirring until a large number of bubbles are generated.

[0018] 2) Add 2.5um microspherical polypropylene powder (PP) into PDMS and stir evenly to obtain a milky white suspension.

[0019] 3) Add dye and stir evenly to obtain a stretch-chromic mixed solution.

[0020] 4) The tensile color-changing mixed solution is coated on the surface of the negative Poisson's ratio yarn, left to stand for 30 minutes, and then placed in an oven at a temperature of 60°C for 30 minutes to dry and solidify, thereby obtaining a tensile color-changing coating structure negative Poisson's ratio yarn.

[0021] 5) The prepared stretch-chromatic negative Poisson's ratio yarn is used as the weft yarn 1 raw material, and polyester is used as the warp yarn 2, and the stretch-chromatic negative Poisson's ratio fabric is obtained by weaving. Figure 1 .

[0022] Furthermore, the above-mentioned stretch color-changing mixed solution is composed of polydimethylsiloxane solution, polypropylene powder and blue dye, and the mixing ratio of the three is 1:1:20; Furthermore, the thickness of the coating on the surface of the negative Poisson's ratio yarn ranges from 0.6 mm.

[0023] The embodiment of the present application also provides a stretch-chromic negative Poisson's ratio fabric, specifically, a stretch-chromic mixed solution is coated on the surface of the negative Poisson's ratio yarn, and after drying, it is used for the warp / weft yarn raw materials of the fabric to obtain a fabric with a reversible stretch-chromic effect and a significant negative Poisson's ratio effect.

[0024] The fabric provided by the above embodiment has good structural and performance stability, and after repeated stretching for many times (more than 100 times), the color change effect and negative Poisson's ratio effect are still maintained. The color of the fabric stretching color change effect is reversible. Under the action of tension, the fabric shows a rapid transition from colored to nearly white; when the tension is removed, the fabric returns to the color before stretching. After repeated stretching for many times, the fabric still has the stretching color change effect and negative Poisson's ratio effect.

[0025] Another example Figure 1 As shown in the figure, the color of the fabric changes rapidly from blue to nearly white as the tensile stress increases. The obvious color change range is 5%-40% elongation, and the stress is removed and it returns to the initial state. At the same time, the negative Poisson's ratio yarn bends under the action of tension, and the fabric shows a negative Poisson's ratio effect. The maximum negative Poisson's ratio is -2.1, see Figure 2 .

[0026] As another embodiment, the fabric provided in the present application can also be used for human health monitoring, and has the advantages of high conformability and high stability.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a tensile discoloration negative Poisson's ratio fabric, characterized in that: The method comprises the following steps: Step 1, adding polypropylene powder to polydimethylsiloxane solution, stirring evenly to obtain a milky suspension; Step 2, adding dye and stirring evenly to obtain a stretching color-changing mixed solution; Step 3, coating the tensile color-changing mixed solution on the surface of the negative Poisson's ratio yarn and allowing it to stand; Then, the yarn is placed in an oven to dry and solidify, thereby obtaining a tensile color-changing coating structure negative Poisson's ratio yarn; Step 4: Use the prepared stretch-chromic coating structured negative Poisson's ratio yarn as warp and weft yarn raw materials, and weave the stretch-chromic negative Poisson's ratio fabric.

2. The method for preparing a tensile color-changing negative Poisson's ratio fabric according to claim 1, characterized in that: The polydimethylsiloxane solution is obtained by: Mix components A and B in 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 tensile color-changing negative Poisson's ratio fabric according to claim 1, characterized in that: The polypropylene powder is 2.5um microspherical polypropylene powder.

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

35.

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

6. A stretch-chromatic negative Poisson's ratio fabric prepared by the method according to any one of claims 1 to 5.

7. The stretch-chromatic negative Poisson's ratio fabric according to claim 6, characterized in that: Under stretching, the fabric has color-changing properties and a negative Poisson's ratio effect.

8. The stretch-chromatic negative Poisson's ratio fabric according to claim 6, characterized in that: The color of the stretch color change effect of the fabric is reversible; under the action of tension, the fabric shows a rapid transition from colored to nearly white; when the tension is removed, the fabric returns to the color when it was not stretched.

9. Application of a stretch-chromatic negative Poisson's ratio fabric in human health monitoring.

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