Method for producing intelligent color-changing knitted underwear fabric

Abstract

The invention discloses a method for producing an intelligent color-changing knitted underwear fabric, which comprises the following steps of: firstly, observing the color-changing change range of bromothymol blue, testing the pH value of a mixed solution of ammonia water and glacial acetic acid in different proportions by using an acid-base indicator, adding a proper amount of bromothymol blue ethanol solution with the mass fraction of 0.5-1%, and uniformly stirring; the color changing conditions of solutions with different pH values and different mass fractions are observed, the pure cotton knitted fabric is soaked in slurry containing a bromothymol blue solution to be dried, then the solutions with different pH values are dropped on white cloth to observe the color changing reaction, recording is conducted, then the pure cotton knitted fabric is partially soaked, and then the local color changing phenomenon is observed. After washing and drying, carrying out repeated experiments to obtain the fabric with a good color change condition.

Description

Technical Field

[0001] The present application relates to the technical field of knitted fabric preparation, and in particular to a method for producing intelligent color-changing knitted underwear fabric. Background Art

[0002] At present, bromothymol blue, also known as bromothymol blue or bromothymol blue, its English name is Bromothymol Blue, referred to as BTB, is an important acid-base indicator. The following is a detailed introduction to bromothymol blue: 1. Chemical properties Chemical formula: CHO5SBr2 (or C27H28Br2O5S) Molecular weight: 624.3812 Appearance: Purple to pink powder, some materials describe it as light rose crystalline powder.

[0003] Density: 1.542 g / cm³ Melting point: 204 ºC (some sources also mention the melting point range is 200~202 ºC) Boiling point: 640.2 ºC at 760 mmHg (some sources mention 614.3 ºC at 760 mmHg) Flash point: 341 ºC (some sources mention 38 ºC) Solubility: easily soluble in ethanol, ether, methanol and dilute alkali hydroxide solution; slightly soluble in benzene, toluene and xylene; slightly soluble in water; almost insoluble in petroleum ether.

[0004] 2. Application Acid-base indicator: Bromothymol blue is often used as an acid-base indicator in biological and chemical experiments. Its color change range is pH 6.0 (yellow)-7.6 (blue), so it can clearly indicate the change of the pH value of the solution. In a neutral solution, it appears light blue or slightly blue; in an acidic solution, it turns yellow; in an alkaline solution, it turns blue.

[0005] The present invention aims to use bromothymol blue ethanol solution to control the pH value to simulate the wearing physiological environment of knitted underwear, especially to simulate the wearing environment of female underwear, and to cause an intelligent color change response of the underwear fabric through the change of the pH value in the environment, thereby achieving the purpose of rapid detection. Summary of the invention

[0006] In order to improve the defects of the existing color-changing knitted underwear fabric, such as the complicated preparation method and high product manufacturing cost, the present invention provides a method for producing intelligent color-changing knitted underwear fabric. The method can make full use of the advantages of bromothymol blue ethanol, and the preparation method is simple. At the same time, the method can reduce product manufacturing costs and save resources, and provides a good idea and method for the cross-disciplinary preparation of functional materials.

[0007] In order to achieve the above tasks, the present invention adopts the following technical solutions: A method for producing intelligent color-changing knitted underwear fabric comprises the following steps: a. Solution preparation: The mass fraction of bromothymol blue is 0.5%~1%, the mass fraction is selected as 0.5%, the solvent is selected as ethanol, weigh bromothymol blue, bromothymol blue is purple to pink powder, dissolve it in ethanol solution, stir it thoroughly and let it stand to obtain an orange solution; b. Fabric selection: When choosing fabrics, choose pure cotton knitwear with strong water absorption to prevent the absorption of too little solution from affecting the color change time and effect; c. Color change: The color change range of bromothymol blue is pH 6.0 (yellow) ~ 7.6 (blue). Under neutral conditions, it is light blue or slightly blue; under acidic conditions, it turns yellow; under alkaline conditions, it turns blue; d. Oxidative doping: Pure cotton knitted fabrics immersed in a slurry containing bromothymol blue ethanol solution will change color. After continuous stirring, washing and drying (60°C), color-changing textiles will be formed.

[0008] In summary, the present application includes at least one of the following beneficial technical effects: the preparation method of the present invention is simple and easy to implement, and the prepared acid-base color-changing textiles have the properties of obvious color change and good physical and mechanical properties. It can be widely used in biology, chemistry, medicine, military industry and other fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The present invention is a process flow chart of a method for producing intelligent color-changing knitted underwear fabric.

[0010] Figure 2 It's bromothymol blue.

[0011] Figure 3 It is a mixed solution of bromothymol blue and ethanol.

[0012] Figure 4 It is original pure cotton white knitted fabric.

[0013] Figure 5 It is a white knitted fabric treated with bromothymol blue.

[0014] Figure 6This is a comparison chart of the color development of bromothymol blue. DETAILED DESCRIPTION

[0015] The following is a further detailed description of this application.

[0016] Example 1: a. Solution preparation: Note that the solvent is ethanol, weigh bromothymol blue, note that the mass fraction of bromothymol blue is 0.5%, note that bromothymol blue is purple to pink powder, and after dissolving in the ethanol solution, it should be fully stirred and then allowed to stand to obtain an orange solution; b. Fabric selection: When choosing fabrics, choose pure cotton knitwear with strong water absorption to prevent the absorption of too little solution from affecting the color change time and effect; c. Color change: The color change range of bromothymol blue is pH 6.0 (yellow) ~ 7.6 (blue). Under neutral conditions, it is light blue or slightly blue; under acidic conditions, it turns yellow; under alkaline conditions, it turns blue; d. Oxidative doping: Pure cotton knitted fabrics soaked in bromothymol blue ethanol solution will change color. After continuous stirring, washing and drying (60°C), color-changing textiles will be formed.

[0017] Example 2: a. Solution preparation: Note that the solvent is ethanol, weigh bromothymol blue, note that the mass fraction of bromothymol blue is 0.7%, note that bromothymol blue is purple to pink powder, and after dissolving in the ethanol solution, it should be fully stirred and then allowed to stand to obtain an orange solution; b. Fabric selection: When choosing fabrics, choose pure cotton knitwear with strong water absorption to prevent the absorption of too little solution from affecting the color change time and effect; c. Color change: The color change range of bromothymol blue is pH 6.0 (yellow) ~ 7.6 (blue). Under neutral conditions, it is light blue or slightly blue; under acidic conditions, it turns yellow; under alkaline conditions, it turns blue; d. Oxidative doping: Pure cotton knitted fabrics soaked in bromothymol blue ethanol solution will change color. After continuous stirring, washing and drying (65°C), color-changing textiles will be formed.

[0018] Example 3: a. Solution preparation: Note that the solvent is ethanol, weigh bromothymol blue, note that the mass fraction of bromothymol blue is 0.8%, note that bromothymol blue is purple to pink powder, and after dissolving in the ethanol solution, it should be fully stirred and then allowed to stand to obtain an orange solution; b. Fabric selection: When choosing fabrics, choose pure cotton knitwear with strong water absorption to prevent the absorption of too little solution from affecting the color change time and effect; c. Color change: The color change range of bromothymol blue is pH 6.0 (yellow) ~ 7.6 (blue). Under neutral conditions, it is light blue or slightly blue; under acidic conditions, it turns yellow; under alkaline conditions, it turns blue; d. Oxidative doping: Pure cotton knitted fabrics soaked in bromothymol blue ethanol solution will change color. After continuous stirring, washing and drying (63°C), color-changing textiles will be formed.

[0019] Example 4: a. Solution preparation: Note that the solvent is ethanol, weigh bromothymol blue, note that the mass fraction of bromothymol blue is 1%, note that bromothymol blue is purple to pink powder, and after dissolving in the ethanol solution, it should be fully stirred and then allowed to stand to obtain an orange solution; b. Fabric selection: When choosing fabrics, choose pure cotton knitwear with strong water absorption to prevent the absorption of too little solution from affecting the color change time and effect; c. Color change: The color change range of bromothymol blue is pH 6.0 (yellow) ~ 7.6 (blue). Under neutral conditions, it is light blue or slightly blue; under acidic conditions, it turns yellow; under alkaline conditions, it turns blue; d. Oxidative doping: Pure cotton knitted fabrics immersed in a slurry containing bromothymol blue ethanol solution will change color. After continuous stirring, washing and drying (55°C), color-changing textiles will be formed.

[0020] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for producing intelligent color-changing knitted underwear fabric, characterized in that The steps include: a. Solution preparation: Choose ethanol. When weighing bromothymol blue, note that bromothymol blue is a purple to pink powder. After dissolving in the ethanol solution, stir it thoroughly and let it stand to obtain an orange solution. b. Fabric selection: When choosing fabrics, choose pure cotton knitwear with strong water absorption to prevent the absorption of too little solution from affecting the color change time and effect; c. Color change: The color change range of bromothymol blue is pH 6.0-7.

6. Under neutral conditions, it is light blue or slightly blue; under acidic conditions, it turns yellow; under alkaline conditions, it turns blue; d. Oxidative doping: Pure cotton knitwear impregnated with bromothymol blue ethanol solution will change color. After continuous stirring, washing and drying (60°C), color-changing textiles will be formed.

2. The method for producing intelligent color-changing knitted underwear fabric according to claim 1, characterized in that: In the bromothymol blue ethanol solution used in step a, the mass fraction of bromothymol blue is 0.5%-1%.

3. The method for producing intelligent color-changing knitted underwear fabric according to claim 2, characterized in that: The drying method in step d is vacuum drying, deionized water is used for washing, and the drying temperature is 60°C.

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