A kind of thermochromic fabric and its dyeing process

Abstract

A thermochromic fabric dyeing process comprises the following steps: S1: dyeing pretreatment: applying a pretreatment liquid to the fabric, standing for 15-25 minutes, dehydrating, rinsing, and standby; S2: dyeing: adding the pretreated fabric to the thermochromic dyeing liquid, stirring and dyeing at 75-80°C for 15-25 minutes; S3: color fixing: immersing the dyed fabric in the color fixing liquid for color fixing treatment, and the color fixing time is 24-48 hours; S4: shaping: drying the color-fixed fabric, and shaping at high temperature at 100-120°C for 5-10 minutes to obtain the thermochromic fabric. The invention relates to a thermochromic fabric and a dyeing process thereof, wherein the fabric has excellent air permeability, color fastness, and good thermochromic effect.

Description

Technical Field

[0001] The invention relates to the field of textile fabrics, and in particular to a thermochromic fabric and a dyeing process thereof. Background Art

[0002] Fabrics are materials used to make clothing. Fabrics can not only interpret the style and characteristics of clothing, but also directly influence the color and shape of clothing. With the improvement of living standards, people's requirements for clothes are not only the basic functions of warmth and concealment, but also the appearance of clothes is attracting more and more attention. For example, the color-changing function can make the fabric change color in response to light, temperature and other inductions, increasing the fashionability or concealment of clothing. However, conventional fabrics are directly dyed with thermochromic dyes, which generally have the problems of poor color fastness, uneven dyeing and easy color fringing. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a thermochromic fabric and a dyeing process thereof, wherein the fabric has excellent air permeability, color fastness and good thermochromic effect.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A thermochromic fabric dyeing process comprises the following steps:

[0006] S1: Pre-dyeing treatment: Apply the pre-treatment liquid to the fabric, let it stand for 15-25 minutes, dehydrate, rinse and set aside;

[0007] S2: Dyeing: Add the pre-treated fabric into the thermochromic dye solution and dye at 75-80°C for 15-25 minutes;

[0008] S3: Fixing: Immerse the dyed fabric in the fixing solution for fixing, the fixing time is 24-48 hours;

[0009] S4: Setting: Dry the color-fixed fabric and set it at high temperature of 100-120℃ for 5-10min to obtain the thermochromic fabric.

[0010] Preferably, the method further comprises the following steps:

[0011] S5: Mix the PEG aqueous solution, silane coupling agent and iron oxide powder in a weight ratio of 3:1:1, stir and disperse evenly for 60 minutes to form an iron oxide slurry, apply the iron oxide slurry evenly to the surface of the fabric after high-temperature setting, let it stand, and dry to obtain the thermochromic fabric.

[0012] Preferably, the pretreatment liquid is a sodium acetate solution with a mass fraction of 75%.

[0013] Preferably, the method for preparing the thermochromic dye solution in step S2 comprises the following steps:

[0014] S21: mixing polylactic acid-glycolic acid copolymer, thermochromic dye, graphene oxide and water to obtain a cross-linked phase;

[0015] The polyvinyl alcohol and 25% by mass chitosan acetic acid solution are mixed to obtain a solvent phase;

[0016] S22: Mix the crosslinking phase and the solvent phase, and stir for 12-24 hours to obtain a thermochromic dye solution.

[0017] Preferably, the weight ratio of the polylactic acid-glycolic acid copolymer, the thermochromic dye, graphene oxide and water is 2:2:1:4, and the weight ratio of the polyvinyl alcohol and chitosan acetic acid solution is 1:1.

[0018] Preferably, the weight ratio of the crosslinking phase to the solvent phase is 1:2.

[0019] Preferably, the method for preparing the fixing solution in step S3 comprises the following steps:

[0020] The sodium alginate solution, the silane coupling agent, the color fixing agent and the chitosan quaternary ammonium salt acetic acid solution with a mass fraction of 50% are mixed and stirred for 1-2 hours to obtain the color fixing solution.

[0021] Preferably, the weight ratio of the sodium alginate solution, the silane coupling agent, the color fixing agent and the chitosan quaternary ammonium salt acetate solution is 2:1:2:2.

[0022] Preferably, the color fixing agent is a quaternary ammonium salt color fixing agent.

[0023] A thermochromic fabric is made by the dyeing process.

[0024] The thermochromic dye of the present invention is captured by the rough structure formed by the macromolecular chain and graphene oxide, and can be distributed along the molecular chain direction. Through the electrostatic adsorption phenomenon formed by the positive charge of chitosan itself and the negative charge on the fiber surface, the dye molecules can penetrate, insert and cross-link to the surface and pores of the fabric fiber, thereby increasing the attachment area and attachment strength of the thermochromic dye to the fabric fiber, thereby improving the dyeing rate and color fastness.

[0025] In addition, the quaternary ammonium salt color fixing agent of the present invention is modified by chitosan quaternary ammonium salt acetic acid solution and sodium alginate solution. The chitosan quaternary ammonium salt is dissolved in water and ionized to form -NH3+ and quaternary ammonium groups to form a polycation electrolyte solution. The sodium alginate is dissolved in water and ionized to form a large amount of -COO- to form a polyanion electrolyte solution. Therefore, the quaternary ammonium salt color fixing agent is tightly combined and cross-linked and condensed together through the electrostatic force of opposite charges, thereby improving the compactness of the color fixing agent and the thermochromic dye and enhancing the fastness to the thermochromic dye. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, it is specifically stated that the raw materials and equipment of the present invention can be obtained from the market, and no longer listed one by one. Among them, the raw materials of the present invention can be obtained from the market, which are well known to those skilled in the art, such as the thermochromic dye is the dye of Jinhua Lijin Technology Co., Ltd. (such as dye A: the process of thermochromic change is: red at 23°C, blue at 28°C, and white at 35°C. It can be customized by the manufacturer according to different needs), and the quaternary ammonium salt fixing agent is the Eccofix FD-3 fixing agent of Aiboer Company.

[0027] Embodiment 1:

[0028] A thermochromic fabric dyeing process comprises the following steps:

[0029] S1: Pre-dyeing treatment: Apply 75% sodium acetate solution to the fabric, let stand for 25 minutes, dehydrate, rinse and set aside;

[0030] S2: Dyeing: Add the pre-treated fabric into the thermochromic dye solution and dye at 80°C with stirring for 25 minutes;

[0031] S3: Fixing: Immerse the dyed fabric in the fixing solution for 48 hours;

[0032] S4: Setting: Dry the color-fixed fabric and set it at 120°C for 10 minutes to obtain the thermochromic fabric.

[0033] After step S4, the dried fabric can also be coated for protection, that is, step S5: take PEG aqueous solution (commercially available polyethylene glycol PEG6000), silane coupling agent and iron oxide powder in a weight ratio of 3:1:1, mix them, stir and disperse them evenly for 60 minutes to form iron oxide slurry, and evenly apply the iron oxide slurry to the surface of the fabric after high-temperature setting, let it stand, and dry to obtain a thermochromic fabric with a protective film layer, which not only does not affect the thermochromic effect, but also can play a certain radiation protection and toughening role.

[0034] The method for preparing the thermochromic dye solution in step S2 comprises the following steps:

[0035] S21: mixing polylactic acid-glycolic acid copolymer, thermochromic dye, graphene oxide and water in a weight ratio of 2:2:1:4 to obtain a cross-linked phase;

[0036] Polyvinyl alcohol and 25% by weight chitosan acetate solution are mixed in a weight ratio of 1:1 to obtain a solvent phase;

[0037] S22: Mix the crosslinking phase and the solvent phase in a weight ratio of 1:2, and stir for 24 hours to obtain a thermochromic dye solution.

[0038] The method for preparing the fixing solution in step S3 comprises the following steps:

[0039] Sodium alginate solution, silane coupling agent, quaternary ammonium salt color fixing agent and 50% chitosan quaternary ammonium salt acetic acid solution by weight were mixed in a ratio of 2:1:2:2, and stirred for 2 hours to obtain a color fixing solution.

[0040] A thermochromic fabric is made by the dyeing process.

[0041] Embodiment 2:

[0042] A thermochromic fabric dyeing process comprises the following steps:

[0043] S1: Pre-dyeing treatment: Apply 75% sodium acetate solution to the fabric, let stand for 15 minutes, dehydrate, rinse and set aside;

[0044] S2: Dyeing: Add the pre-treated fabric into the thermochromic dye solution and dye at 75°C for 15 minutes;

[0045] S3: Fixing: Immerse the dyed fabric in the fixing solution for fixing for 24 hours;

[0046] S4: Setting: Dry the color-fixed fabric and set it at 100°C for 5 minutes to obtain the thermochromic fabric.

[0047] After step S4, the dried fabric can also be coated for protection, that is, step S5: take PEG aqueous solution (commercially available polyethylene glycol PEG6000), silane coupling agent and iron oxide powder in a weight ratio of 3:1:1, mix them, stir and disperse them evenly for 60 minutes to form iron oxide slurry, and evenly apply the iron oxide slurry to the surface of the fabric after high-temperature setting, let it stand, and dry to obtain a thermochromic fabric with a protective film layer, which not only does not affect the thermochromic effect, but also can play a certain radiation protection and toughening role.

[0048] The method for preparing the thermochromic dye solution in step S2 comprises the following steps:

[0049] S21: mixing polylactic acid-glycolic acid copolymer, thermochromic dye, graphene oxide and water in a weight ratio of 2:2:1:4 to obtain a cross-linked phase;

[0050] Polyvinyl alcohol and 25% by weight chitosan acetate solution are mixed in a weight ratio of 1:1 to obtain a solvent phase;

[0051] S22: Mix the crosslinking phase and the solvent phase in a weight ratio of 1:2, and stir for 12 hours to obtain a thermochromic dye solution.

[0052] The method for preparing the fixing solution in step S3 comprises the following steps:

[0053] Sodium alginate solution, silane coupling agent, quaternary ammonium salt color fixing agent and 50% chitosan quaternary ammonium salt acetic acid solution by weight were mixed in a ratio of 2:1:2:2, and stirred for 1 hour to obtain a color fixing solution.

[0054] A thermochromic fabric is made by the dyeing process.

[0055] Embodiment three:

[0056] A thermochromic fabric dyeing process comprises the following steps:

[0057] S1: Pre-dyeing treatment: Apply 75% sodium acetate solution to the fabric, let stand for 20 minutes, dehydrate, rinse and set aside;

[0058] S2: Dyeing: Add the pre-treated fabric into the thermochromic dye solution and dye at 78°C for 20 minutes with stirring;

[0059] S3: Fixation: Immerse the dyed fabric in the fixing solution for fixing for 36 hours;

[0060] S4: Setting: Dry the color-fixed fabric and set it at 110°C for 8 minutes to obtain the thermochromic fabric.

[0061] After step S4, the dried fabric can also be coated for protection, that is, step S5: take PEG aqueous solution (commercially available polyethylene glycol PEG6000), silane coupling agent and iron oxide powder in a weight ratio of 3:1:1, mix them, stir and disperse them evenly for 60 minutes to form iron oxide slurry, and evenly apply the iron oxide slurry to the surface of the fabric after high-temperature setting, let it stand, and dry to obtain a thermochromic fabric with a protective film layer, which not only does not affect the thermochromic effect, but also can play a certain radiation protection and toughening role.

[0062] The method for preparing the thermochromic dye solution in step S2 comprises the following steps:

[0063] S21: mixing polylactic acid-glycolic acid copolymer, thermochromic dye, graphene oxide and water in a weight ratio of 2:2:1:4 to obtain a cross-linked phase;

[0064] Polyvinyl alcohol and 25% by weight chitosan acetate solution are mixed in a weight ratio of 1:1 to obtain a solvent phase;

[0065] S22: Mix the crosslinking phase and the solvent phase in a weight ratio of 1:2, and stir for 20 hours to obtain a thermochromic dye solution.

[0066] The method for preparing the fixing solution in step S3 comprises the following steps:

[0067] Sodium alginate solution, silane coupling agent, quaternary ammonium salt color fixing agent and 50% chitosan quaternary ammonium salt acetic acid solution by weight were mixed in a ratio of 2:1:2:2, and stirred for 1.5 hours to obtain a color fixing solution.

[0068] A thermochromic fabric is made by the dyeing process.

[0069] Comparative Example 1:

[0070] The dyeing process of Comparative Example 1 is substantially the same as that of Example 1, except that a thermochromic dye aqueous solution is directly used for dyeing, and a quaternary ammonium salt color fixing agent aqueous solution is directly used for color fixing, specifically:

[0071] A thermochromic fabric dyeing process comprises the following steps:

[0072] S1: Pre-dyeing treatment: Apply 75% sodium acetate solution to the fabric, let stand for 25 minutes, dehydrate, rinse and set aside;

[0073] S2: dyeing: add the pre-treated fabric into the thermochromic dye aqueous solution and dye at 80°C with stirring for 25 minutes;

[0074] S3: Color fixation: The dyed fabric is immersed in a quaternary ammonium salt color fixative aqueous solution for color fixation for 48 hours;

[0075] S4: Setting: Dry the color-fixed fabric and set it at 120°C for 10 minutes to obtain the thermochromic fabric.

[0076] After step S4, the dried fabric can also be coated for protection, that is, step S5: take PEG aqueous solution (commercially available polyethylene glycol PEG6000), silane coupling agent and iron oxide powder in a weight ratio of 3:1:1, mix them, stir and disperse them evenly for 60 minutes to form iron oxide slurry, and evenly apply the iron oxide slurry to the surface of the fabric after high-temperature setting, let it stand, and dry to obtain a thermochromic fabric with a protective film layer, which not only does not affect the thermochromic effect, but also can play a certain radiation protection and toughening role.

[0077] A thermochromic fabric is made by the dyeing process.

[0078] Color fastness tests, air permeability and heat transfer coefficient tests were performed on Examples 1-3, the thermochromic fabrics commercially available from Dongguan Rongsui Textile Products Co., Ltd., and the thermochromic fabric obtained in Comparative Example 1.

[0079] Washing color fastness test: in accordance with GB / T3921-2008 and GB / T250-2008 standards.

[0080] Air permeability test: in accordance with GB / T5453 standard.

[0081] Heat transfer coefficient test: in accordance with GB / T11048 standard.

[0082] The test results are shown in Table 1.

[0083]

[0084] It can be seen from the above table that the color fastness grades of the thermochromic fabrics of Examples 1-3 are all improved compared with that of Comparative Example 1, and have good air permeability and heat transfer coefficient, indicating that the fabrics of the present invention have excellent air permeability and color fastness, and have good thermochromic effect.

[0085] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thermochromic fabric dyeing process, characterized in that: The following steps are involved: S1: Pre-dyeing treatment: Apply the pre-treatment liquid to the fabric, let it stand for 15-25 minutes, dehydrate, rinse and set aside; S2: Dyeing: Add the pre-treated fabric into the thermochromic dye solution and dye at 75-80°C with stirring for 15-25 minutes; S3: Fixing: Immerse the dyed fabric in the fixing solution for fixing, the fixing time is 24-48 hours; S4: Setting: Dry the color-fixed fabric and set it at 100-120℃ for 5-10min to obtain the thermochromic fabric; return The following steps are involved: S5: Mix the PEG aqueous solution, silane coupling agent and iron oxide powder in a weight ratio of 3:1:1, stir and disperse evenly for 60 minutes to form an iron oxide slurry, apply the iron oxide slurry evenly to the surface of the fabric after high-temperature setting, let it stand, and dry to obtain the thermochromic fabric.

2. The dyeing process of the thermochromic fabric according to claim 1, characterized in that: The pretreatment liquid is a sodium acetate solution with a mass fraction of 75%.

3. The dyeing process of the thermochromic fabric according to claim 1, characterized in that: The method for preparing the thermochromic dye solution in step S2 comprises the following steps: S21: mixing polylactic acid-glycolic acid copolymer, thermochromic dye, graphene oxide and water to obtain a cross-linked phase; The polyvinyl alcohol and 25% by mass chitosan acetic acid solution are mixed to obtain a solvent phase; S22: Mix the crosslinking phase and the solvent phase, and stir for 12-24 hours to obtain a thermochromic dye solution.

4. The dyeing process of the thermochromic fabric according to claim 3, characterized in that: The weight ratio of the polylactic acid-glycolic acid copolymer, the thermochromic dye, graphene oxide and water is 2:2:1:4, and the weight ratio of the polyvinyl alcohol and the chitosan acetic acid solution is 1:

1.

5. The dyeing process of the thermochromic fabric according to claim 3, characterized in that: The weight ratio of the crosslinking phase to the solvent phase is 1:

2.

6. The dyeing process of the thermochromic fabric according to claim 1, characterized in that: The method for preparing the fixing solution in step S3 comprises the following steps: The sodium alginate solution, the silane coupling agent, the color fixing agent and the chitosan quaternary ammonium salt acetic acid solution with a mass fraction of 50% are mixed and stirred for 1-2 hours to obtain the color fixing solution.

7. The dyeing process of the thermochromic fabric according to claim 6, characterized in that: The weight ratio of the sodium alginate solution, the silane coupling agent, the color fixing agent and the chitosan quaternary ammonium salt acetic acid solution is 2:1:2:

2.

8. The dyeing process of the thermochromic fabric according to claim 6, characterized in that: The color fixing agent is a quaternary ammonium salt color fixing agent.

9. A thermochromic fabric, characterized in that: The method is prepared by the dyeing process described in any one of claims 1 to 8.

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