Underpants with water-printing discoloration and method for manufacturing the same

Abstract

The application discloses a pair of underpants with water-sensitive printing and color changing and a preparation method thereof. In one aspect, the application provides a pair of underpants with water-sensitive printing and color changing, wherein the surface of the underpants is printed with water-sensitive color-changing paint, and the mass ratio of the raw materials of the water-sensitive color-changing paint is as follows: 35-45 parts of liquid silica gel, 20-30 parts of vinyl silicone oil, 0.01-0.1 part of purple sweet potato anthocyanin, 2-6 parts of calcium carbonate, 2-4 parts of chitosan micro powder, 2-6 parts of titanium white powder, 1-4 parts of hygroscopic agent and 8-12 parts of deionized water. In another aspect, the application also provides a preparation method of the pair of underpants with water-sensitive printing and color changing. The application can realize water-sensitive color development and visually prompt people that clothes are wet and not dry.

Description

Technical Field

[0001] This application relates to the field of textile technology, and in particular to a type of underwear that changes color upon contact with water and a method for its preparation. Background Technology

[0002] The humidity in southern my country is relatively high, exceeding that of northern regions in both winter and summer. Furthermore, the region experiences significant rainfall in spring and autumn, making it difficult to dry clothes. Underwear, being worn close to the skin, is particularly susceptible to bacterial growth in damp environments, increasing the risk of various illnesses.

[0003] Based on the above problems, there is an urgent need in this field for a solution that can visually determine the humidity of underwear in order to solve the aforementioned technical problems. Summary of the Invention

[0004] In order to solve at least one of the above-mentioned technical problems and to develop underwear that can be wet-sensitive and visually indicate that the clothes are damp or not completely dry, this application provides underwear that changes color when it is wet and printed, and its preparation method.

[0005] On one hand, this application provides a pair of underwear that changes color upon contact with water through printing. The underwear surface is printed with a moisture-sensitive color-changing coating. The moisture-sensitive color-changing coating has the following composition by mass ratio of raw materials: 35-45 parts liquid silica gel, 20-30 parts vinyl silicone oil, 0.01-0.1 parts purple sweet potato anthocyanin, 2-6 parts calcium carbonate, 2-4 parts chitosan powder, 2-6 parts titanium dioxide, 1-4 parts hygroscopic agent, and 8-12 parts deionized water.

[0006] By adopting the above technical solution, this application uses liquid silicone and vinyl silicone oil to prepare the adhesive solution. The main component, liquid silicone, is a food-grade raw material. After crosslinking with vinyl silicone oil, the resulting film is completely non-toxic and non-irritating. Simultaneously, the moisture-sensitive color-developing component of this application uses natural color-changing agents and completely non-toxic and non-irritating raw materials, effectively ensuring that the printed material is non-toxic and non-allergenic to the human body, exhibiting good biocompatibility. This application uses an appropriate moisture-sensitive color-developing component ratio, neutralizing the color of purple sweet potato anthocyanins through chitosan and titanium dioxide, resulting in a very light orange color upon drying. When wet, it turns a light blue color with a very obvious color difference, which is also aesthetically pleasing. This application adds a hygroscopic component, and by adjusting the amount of hygroscopic agent added, the color-changing humidity of the moisture-sensitive color development can be adjusted within the range of 60% to 100%. Appropriate printing materials can be configured according to regional differences to meet the needs of different regions. The moisture-sensitive color-developing component of this application contains chitosan, which can play an antibacterial role. This makes the product of this application not only have the function of changing color when wet, but also have a certain degree of antibacterial properties, which can effectively meet the user's physiological and hygiene needs.

[0007] Optionally, the molecular weight of the liquid silica gel is 100,000 to 300,000 g / mol.

[0008] Optionally, the vinyl content of the vinyl silicone oil is 4-6%.

[0009] Further optionally, the viscosity of the vinyl silicone oil is 200–400 mPa·s.

[0010] Optionally, the particle size of the calcium carbonate is controlled to be within 100 μm.

[0011] Optionally, the titanium dioxide is made of nano-sized powder.

[0012] Optionally, the desiccant is butanediol.

[0013] On the other hand, this application also provides a method for preparing the above-mentioned water-sensitive color-changing printed underwear, including the following steps:

[0014] S1. Add the chitosan of the specified amount to the deionized water of the specified amount, mix and allow it to swell to form a gel solution;

[0015] S2. Add the prescribed amounts of purple sweet potato anthocyanins, calcium carbonate, titanium dioxide and hygroscopic agent to the gel solution obtained in step S1, and then stir and mix to prepare a color development slurry.

[0016] S3. Mix the liquid silicone and vinyl silicone oil according to the formula, and mix them at high speed in a high-speed shear mixer to obtain the adhesive solution;

[0017] S4. Add the color developing paste prepared in step S2 to the adhesive solution obtained in step S3, grind and disperse to obtain printing adhesive; S5. Print the printing adhesive from step S4 onto underwear by screen printing, and air dry until the printing adhesive is completely cured to obtain underwear that changes color when exposed to water.

[0018] Optionally, in step S3, the high-speed shear stirring is performed at a speed of 1800 rpm or higher for at least 15 minutes.

[0019] Optionally, in step S4, the grinding and dispersing are performed using a grinding and dispersing machine for at least 30 minutes.

[0020] By adopting the above technical solution, this application uses liquid silicone and vinyl silicone oil to separately prepare the adhesive solution, and the remaining components to prepare the color developing paste. Then, the two are mixed and dispersed to prepare the printing adhesive. The moisture-sensitive color developing component can be better dispersed in the printing adhesive, ensuring stable and uniform color development. This application uses high-speed shear stirring to prepare the adhesive solution, and at the same time uses grinding and dispersion to prepare the printing adhesive. The components of the prepared printing adhesive are extremely uniformly dispersed, and the liquid silicone and vinyl silicone oil can be fully mixed. The printed print can adhere very well to the surface of underwear and has excellent water-wash resistance and peel-off performance.

[0021] In summary, the present invention has at least one of the following beneficial technical effects:

[0022] 1. The application uses liquid silicone and vinyl silicone oil to prepare the adhesive solution. The main component, liquid silicone, is a food-grade raw material. After cross-linking with vinyl silicone oil, the resulting adhesive film is completely non-toxic and non-irritating. At the same time, the moisture-sensitive color-developing component of this application uses natural color-changing agents and completely non-toxic and non-irritating raw materials, which effectively ensures that the printed material is non-toxic and non-allergenic to the human body and has good biosafety.

[0023] 2. This application uses a suitable moisture-sensitive colorimetric ratio, which neutralizes the color of purple sweet potato anthocyanins by using chitosan and titanium dioxide. When dry, it is a very light orange color, and when moist, it is a light blue color with a very obvious color difference, and it is also aesthetically pleasing.

[0024] 3. This application adds a hygroscopic component, which can adjust the humidity of the moisture-sensitive color change within the range of 60% to 100% by adjusting the amount of hygroscopic agent added. It can also be used to configure suitable printing materials according to regional differences to meet the needs of different regions.

[0025] 4. The moisture-sensitive color-developing component of this application contains chitosan, which can play an antibacterial role. This makes the product of this application not only have the function of changing color when exposed to water, but also have a certain antibacterial property, which can effectively meet the user's physiological hygiene needs.

[0026] 5. This application uses liquid silica gel and vinyl silicone oil separately to prepare the adhesive solution, and the remaining components to prepare the color developing paste. Then, the two are mixed and dispersed to prepare the printing adhesive. The moisture-sensitive color developing component can be better dispersed in the printing adhesive, ensuring stable and uniform color development. This application uses high-speed shear stirring to prepare the adhesive solution, and at the same time uses grinding and dispersion to prepare the printing adhesive. The components of the prepared printing adhesive are extremely uniformly dispersed, and the liquid silica gel and vinyl silicone oil can be fully mixed. The printed print can adhere very well to the surface of underwear and has excellent water resistance and peel-off performance. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the embodiments.

[0028] This application designs a water-sensitive color-changing printed underwear. The underwear can be made of modal, bamboo charcoal fiber, cotton, or other synthetic fiber materials. The surface of the underwear is printed with a moisture-sensitive color-changing coating. The moisture-sensitive color-changing coating has the following composition by weight: 35-45 parts liquid silica gel, 20-30 parts vinyl silicone oil, 0.01-0.1 parts purple sweet potato anthocyanin, 2-6 parts calcium carbonate, 2-4 parts chitosan powder, 2-6 parts titanium dioxide, 1-4 parts hygroscopic agent, and 8-12 parts deionized water.

[0029] The method for preparing the water-sensitive color-changing printed underwear of this application includes the following steps:

[0030] S1. Add the chitosan of the specified amount to the deionized water of the specified amount, mix and allow it to swell to form a gel solution;

[0031] S2. Add the prescribed amounts of purple sweet potato anthocyanins, calcium carbonate, titanium dioxide and hygroscopic agent to the gel solution obtained in step S1, and then stir and mix to prepare a color development slurry.

[0032] S3. Mix the liquid silicone and vinyl silicone oil according to the formula, and mix them at high speed in a high-speed shear mixer to obtain the adhesive solution;

[0033] S4. Add the color developing paste prepared in step S2 to the adhesive solution obtained in step S3, grind and disperse to obtain printing adhesive; S5. Print the printing adhesive from step S4 onto underwear by screen printing, and air dry until the printing adhesive is completely cured to obtain underwear that changes color when exposed to water.

[0034] The design of this application not only effectively ensures that the printed part is non-toxic and non-irritating to the human body and can accurately develop color when wet, but also that the printed pattern can effectively adhere to the surface of the underwear and has excellent resistance to washing and removal.

[0035] The following is a preparation example of this application.

[0036] Preparation Example 1

[0037] The preparation method of the water-sensitive color-changing printed underwear in this example includes the following steps:

[0038] S1. Add the chitosan of the specified amount to the deionized water of the specified amount, mix and allow it to swell to form a gel solution;

[0039] S2. Add the formulated amounts of purple sweet potato anthocyanins, calcium carbonate, titanium dioxide and hygroscopic agent to the gel solution obtained in step S1, and then stir and mix thoroughly to prepare a color development slurry.

[0040] S3. Mix the liquid silicone and vinyl silicone oil according to the formula, and shear and stir for 30 minutes at 1500 rpm in a high-speed shear mixer to obtain the adhesive solution.

[0041] S4. Add the color developing paste prepared in step S2 to the adhesive solution obtained in step S3, and grind and disperse it in a grinding and dispersing machine for 10 minutes to obtain the printing adhesive.

[0042] S5. Pour the printing adhesive from step S4 into the screen printing machine, and print the print on the underwear according to the designed printing scheme. Let it air dry at room temperature until the printing adhesive is completely cured to obtain underwear that changes color when it is exposed to water.

[0043] Preparation Example 2

[0044] The preparation method of the water-sensitive color-changing printed underwear in this example includes the following steps:

[0045] S1. Add the chitosan of the specified amount to the deionized water of the specified amount, mix and allow it to swell to form a gel solution;

[0046] S2. Add the formulated amounts of purple sweet potato anthocyanins, calcium carbonate, titanium dioxide and hygroscopic agent to the gel solution obtained in step S1, and then stir and mix thoroughly to prepare a color development slurry.

[0047] S3. Mix the liquid silicone and vinyl silicone oil according to the formula, and shear and stir for 10 minutes at 1800 rpm in a high-speed shear mixer to obtain the adhesive solution.

[0048] S4. Add the color developing paste prepared in step S2 to the adhesive solution obtained in step S3, and grind and disperse it in a grinding and dispersing machine for 15 minutes to obtain the printing adhesive.

[0049] S5. Pour the printing adhesive from step S4 into the screen printing machine, and print the print on the underwear according to the designed printing scheme. Let it air dry at room temperature until the printing adhesive is completely cured to obtain underwear that changes color when it is exposed to water.

[0050] Preparation Example 3

[0051] The preparation method of the water-sensitive color-changing printed underwear in this example includes the following steps:

[0052] S1. Add the chitosan of the specified amount to the deionized water of the specified amount, mix and allow it to swell to form a gel solution;

[0053] S2. Add the formulated amounts of purple sweet potato anthocyanins, calcium carbonate, titanium dioxide and hygroscopic agent to the gel solution obtained in step S1, and then stir and mix thoroughly to prepare a color development slurry.

[0054] S3. Mix the liquid silicone and vinyl silicone oil according to the formula, and shear and stir for 15 minutes at 1800 rpm in a high-speed shear mixer to obtain the adhesive solution.

[0055] S4. Add the color developing paste prepared in step S2 to the adhesive solution obtained in step S3, and grind and disperse it in a grinding and dispersing machine for 30 minutes to obtain the printing adhesive.

[0056] S5. Pour the printing adhesive from step S4 into the screen printing machine, and print the print on the underwear according to the designed printing scheme. Let it air dry at room temperature until the printing adhesive is completely cured to obtain underwear that changes color when it is exposed to water.

[0057] Preparation Example 4

[0058] The preparation method of the water-sensitive color-changing printed underwear in this example includes the following steps:

[0059] S1. Add the chitosan of the specified amount to the deionized water of the specified amount, mix and allow it to swell to form a gel solution;

[0060] S2. Add the formulated amounts of purple sweet potato anthocyanins, calcium carbonate, titanium dioxide and hygroscopic agent to the gel solution obtained in step S1, and then stir and mix thoroughly to prepare a color development slurry.

[0061] S3. Mix the liquid silicone and vinyl silicone oil according to the formula, and shear and stir for 20 minutes at 1800 rpm in a high-speed shear mixer to obtain the adhesive solution.

[0062] S4. Add the color developing paste prepared in step S2 to the adhesive solution obtained in step S3, and grind and disperse it in a grinding and dispersing machine for 30 minutes to obtain the printing adhesive.

[0063] S5. Pour the printing adhesive from step S4 into the screen printing machine, and print the print on the underwear according to the designed printing scheme. Let it air dry at room temperature until the printing adhesive is completely cured to obtain underwear that changes color when it is exposed to water.

[0064] The following are embodiments of this application.

[0065] The sources of the raw materials used in the embodiments of this application are as follows:

[0066] Liquid silica gel - Zhejiang Jutai New Material Technology Co., Ltd.; Vinyl silicone oil - Tesco Chemical (Hubei) Co., Ltd.; Purple sweet potato anthocyanins - Shaanxi Tengmai Biotechnology; Calcium carbonate - Wuhan Xinyang Ruihe Chemical Technology Co., Ltd.; Chitosan micro powder - Wuhan Dingxintong Pharmaceutical Co., Ltd.; Titanium dioxide - Wuhan Xinyang Ruihe Chemical Technology Co., Ltd.; Butylene glycol - Wuhan Kamico Technology Co., Ltd.

[0067] The following are Examples 1 to 6 of this application. The raw material ratios and preparation methods used in Examples 1 to 6 of this application are shown in Table 1 below.

[0068] The liquid silica gel in Examples 1-6 of this application uses silica gel with a molecular weight of 400,000 g / mol; the vinyl silicone oil uses silicone oil with a viscosity of 500 mPa·s and a vinyl content of 2%; the calcium carbonate, chitosan powder and titanium dioxide are all powders with a particle size of 240#.

[0069] Table 1. Raw material ratio table for Examples 1-6

[0070]

[0071]

[0072] This application uses commercially available water-sensitive color-changing printed swim trunks as a comparative example to test properties such as color-changing humidity, color before and after color change, and wash fastness. The specific test results are shown in Table 2 below.

[0073] The wash fastness test was performed using the procedure specified in Method 2A of GB / T 8920-2001, with 50 wash cycles, and the print was observed for any peeling.

[0074] Table 2 Performance test results of Examples 1-6

[0075]

[0076] As shown in Table 2, the water-sensitive color-changing printed underwear prepared in Examples 1-6 of this application exhibits significantly better wash fastness than commercially available water-sensitive color-changing printed swim trunks. Furthermore, this application uses a natural color-changing agent, while the comparative example uses anhydrous copper sulfate; therefore, this application is far safer for human use than the comparative example. As shown in Table 1, the color-changing humidity of this application is between 60% and 90%, and a product with a relatively accurate fixed color-changing humidity can be obtained by adjusting the formulation. The functionality of this application is also superior to that of the comparative example.

[0077] The data in Table 2 also show that the products prepared by the processes of Preparation Example 3 and Preparation Example 4 of this application have significantly better water wash fastness than the products prepared by Preparation Example 1 and Preparation Example 2 of this application. Overall, the process of Preparation Example 3 of this application is the best.

[0078] The applicant adjusted and optimized the selection of raw materials to further improve the wash fastness of the product. The following are Examples 7-12 of this application, based on Example 5.

[0079] Example 7

[0080] The difference between this embodiment and Embodiment 5 is that the liquid silicone in this embodiment uses silicone with a molecular weight of 300,000 g / mol, and the vinyl content of the vinyl silicone oil is 6%.

[0081] Example 8

[0082] The difference between this embodiment and embodiment 5 is that the liquid silicone in this embodiment uses silicone with a molecular weight of 100,000 g / mol, and the vinyl content of the vinyl silicone oil is 4%.

[0083] Example 9

[0084] The difference between this embodiment and embodiment 5 is that the liquid silicone in this embodiment uses silicone with a molecular weight of 80,000 g / mol, and the vinyl content of the vinyl silicone oil is 4%.

[0085] Example 10

[0086] The difference between this embodiment and Embodiment 7 is that the viscosity of the vinyl silicone oil in this embodiment is 400 Pa·s.

[0087] Example 11

[0088] The difference between this embodiment and Embodiment 7 is that the viscosity of the vinyl silicone oil in this embodiment is 200 Pa·s.

[0089] Example 12

[0090] The difference between this embodiment and Embodiment 7 is that the viscosity of the vinyl silicone oil in this embodiment is 150 Pa·s.

[0091] The wash fastness of Examples 7 to 12 of this application was tested, and the results are shown in Table 3 below.

[0092] Table 3 Performance test results of Examples 7-12

[0093]

[0094]

[0095] As can be seen from the data in Table 3, when the molecular weight of the liquid silicone in this application is controlled at 100,000 to 300,000 g / mol, the viscosity of the vinyl silicone oil is controlled at less than 400 Pa·s, and the vinyl content is controlled at 4% to 6%, the crosslinking degree of the printing adhesive in this application is better, and excellent wash fastness can be obtained.

[0096] The applicant has also optimized the particle size of the printing adhesive powder in this application. The particle size of the calcium carbonate is controlled within 100μm. When the titanium dioxide is made of nano-sized powder, the printing wash fastness of this application can reach more than 80 washes without peeling off.

[0097] Through experimental research, the applicant has formulated printing adhesives with color-changing humidity of 60%, 65%, 70% and 80%. Examples 13 to 16 of this application are shown below, and the specific raw material ratios are shown in Table 4.

[0098] Table 4. Raw material ratios for Examples 13-16

[0099]

[0100] Through testing, the water-sensitive color-changing printed underwear prepared in Examples 13-16 showed color-changing humidity levels of 60%, 65%, 70%, and 80%, respectively. It is evident that this application can achieve precise control of the color-changing humidity of the print by finely adjusting the amount of the hygroscopic agent butylene glycol, obtaining products with an adjustable color-changing humidity within the range of 60-80%. The color-changing humidity can be determined according to actual needs, fully meeting the requirements of this application regarding health warnings and visual cues for clothing dryness.

[0101] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A type of underwear that changes color upon contact with water during printing, characterized in that, The underwear is printed with a moisture-sensitive color-changing coating. The moisture-sensitive color-changing coating is formulated with the following proportions of raw materials: 35-45 parts liquid silica gel, 20-30 parts vinyl silicone oil, 0.01-0.1 parts purple sweet potato anthocyanin, 2-6 parts calcium carbonate, 2-4 parts chitosan powder, 2-6 parts titanium dioxide, 1-4 parts desiccant, and 8-12 parts deionized water. The liquid silica gel has a molecular weight of 100,000-300,000 g / mol, the vinyl content of the vinyl silicone oil is 4-6%, the viscosity of the vinyl silicone oil is 200-400 mPa·s, the particle size of the calcium carbonate is controlled within 100 μm, and the desiccant is butanediol.

2. The water-sensitive color-changing printed underwear according to claim 1, characterized in that, The titanium dioxide is made of nano-sized powder.

3. A method for preparing the water-sensitive color-changing printed underwear as described in claim 1, characterized in that, Includes the following steps: S1. Add the chitosan of the specified amount to the deionized water of the specified amount, mix and allow it to swell to form a gel solution; S2. Add the prescribed amounts of purple sweet potato anthocyanins, calcium carbonate, titanium dioxide and hygroscopic agent to the gel solution obtained in step S1, and then stir and mix to prepare a color development slurry. S3. Mix the liquid silicone and vinyl silicone oil according to the formula, and mix them at high speed in a high-speed shear mixer to obtain the adhesive solution; S4. Add the color developing paste prepared in step S2 to the adhesive solution obtained in step S3, grind and disperse to obtain the printing adhesive. S5. Print the printing material from step S4 onto the underwear using screen printing, and air dry until the printing material is completely cured to obtain underwear that changes color when exposed to water.

4. The method for preparing water-sensitive color-changing printed underwear according to claim 3, characterized in that, In step S3, the high-speed shear stirring is performed at a speed of 1800 rpm or higher for at least 15 minutes.

5. The method for preparing water-sensitive color-changing printed underwear according to claim 3, characterized in that, In step S4, the grinding and dispersing are performed using a grinding and dispersing machine for at least 30 minutes.

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