Hydrogel type stably colored mask base cloth and preparation method thereof

Abstract

The invention relates to the technical field of mask base cloth, and discloses hydrogel type stably colored mask base cloth and a preparation method thereof. The mask base cloth prepared by the preparation method disclosed by the invention is prepared by taking lignin-based hydrogel short fibers and bamboo fibers as main raw materials, performing opening, mixing, carding and lapping to prepare a fiber net, and then performing pre-wetting, high-pressure spunlace, dehydration and drying processes on the fiber net. The mask base cloth not only has excellent liquid holdup and liquid retention rate, but also has excellent oxidation resistance, coloring stability and breaking strength, and the skin can have high water content after the mask base cloth is attached to the skin.

Description

Technical Field

[0001] The present invention relates to the technical field of mask substrates, and particularly relates to a hydrogel-type mask substrate with stable coloring and a preparation method thereof. Background Art

[0002] With the continuous improvement of consumers' demands for skin care efficacy and experience, as an important step in daily skin care, the substrate materials of masks are also constantly innovating. Traditional non-woven mask substrates have problems such as easy dripping of essence and poor skin adhesion, while hydrogel-type mask substrates have gradually become a research hotspot due to their excellent properties. Hydrogel-type mask substrates have advantages such as high water content, good skin adhesion, good biocompatibility, and being gentle and non-irritating to the skin.

[0003] Traditional hydrogel-type mask substrates still have some defects, such as: (1) Most mask substrates are transparent or white, which is difficult to meet consumers' demands for color and aesthetics; (2) The mask substrates do not have antioxidant functions and cannot meet consumers' demands for antioxidant skin care, and it is difficult to neutralize free radicals on the skin surface and slow down skin oxidative damage. Therefore, it is necessary to develop a mask substrate with antioxidant properties, stable coloring, and other functions to meet the demands for high-efficiency skin care products. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a hydrogel-type mask substrate with stable coloring and a preparation method thereof.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A hydrogel-type mask substrate with stable coloring is made by mixing lignin-based hydrogel short fibers and bamboo fibers to form a fiber web, and then subjecting it to hydrospinning.

[0007] The lignin-based hydrogel short fibers are prepared by the following steps:

[0008] Step A1: Under nitrogen conditions, mix diethanolamine, p-aminobenzoic acid, and p-toluenesulfonic acid, heat to 100°C and stir for 20 min. After adding cyclohexane, continue to heat to 140°C and react for 1 h, then react under vacuum for 2 h, and purify to obtain an amino-terminated product.

[0009] Further, in step A1, the molar ratio of diethanolamine to p-aminobenzoic acid is 1:2, and p-toluenesulfonic acid and cyclohexane are 0.5% and 50% of the total mass of diethanolamine and p-aminobenzoic acid, respectively.

[0010] Step A2: Mix sodium lignosulfonate, amino-terminated product, sodium hydroxide, and water evenly, heat up to 85°C, dropwise add 25 - 35wt% aqueous formaldehyde solution, carry out condensation reflux for 3 - 5h, add 1mol / L hydrochloric acid until no precipitate forms, filter, wash, dry, and grind to obtain pretreated sodium lignosulfonate;

[0011] Furthermore, in Step A2, the dosage ratio of sodium lignosulfonate, amino-terminated product, sodium hydroxide, water, and aqueous formaldehyde solution is 10g: 2 - 4g: 0.3 - 0.5g: 50mL: 4 - 6mL;

[0012] Step A3: Mix lipoic acid, sodium hydroxide, and water and stir for 30min, add N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide and stir for 1 - 2h, then add 2 - 4wt% aqueous solution of pretreated sodium lignosulfonate and ethanol, stir vigorously for 12 - 16h, and carry out rotary evaporation to obtain sodium lignosulfonate disulfide;

[0013] Furthermore, in Step A3, the dosage ratio of lipoic acid, sodium hydroxide, water, N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride, N-hydroxysuccinimide, aqueous solution of pretreated sodium lignosulfonate, and ethanol is 0.1 - 0.2mol: 4 - 8g: 100mL: 0.1 - 0.2mol: 0.05 - 0.1mol: 50mL: 50mL;

[0014] Step A4: Mix dimethylsiloxane, methyltrimethoxysilane, potassium hydroxide, water, and ethanol at 50 - 60°C and stir for 2 - 4h, then heat up to 120°C and react for 30 - 50min, add cyclohexane and cation exchange resin, filter and distill to collect organosilicon; Mix the organosilicon, sodium lignosulfonate disulfide, modified carbon black, polyvinyl alcohol, and water to obtain a spinning solution, then spray the spinning solution through a spinning machine into a 35wt% aqueous glutaraldehyde solution and soak for 2h, take it out, carry out freeze-drying, cut, and obtain lignin-based hydrogel short fibers;

[0015] Furthermore, in Step A4, the mass ratio of dimethylsiloxane, methyltrimethoxysilane, potassium hydroxide, water, ethanol, cyclohexane, and cation exchange resin in the organosilicon is 5 - 10: 2 - 4: 0.01: 2 - 3: 7: 30: 3 - 6;

[0016] Furthermore, in Step A4, the mass ratio of organosilicon, sodium lignosulfonate disulfide, modified carbon black, polyvinyl alcohol, and water in the lignin-based hydrogel short fibers is 1 - 2: 10 - 15: 0.5 - 1: 3 - 5: 300;

[0017] Further, the modified carbon black is prepared by the following steps: mixing carbon black, buffer solution and chitosan solution, stirring for 2 - 3 h, centrifuging, washing and drying to obtain the modified carbon black;

[0018] Further, the buffer solution in the modified carbon black is a phosphate buffer solution with pH = 7.6;

[0019] Further, the chitosan solution in the modified carbon black is prepared by mixing chitosan and water at a mass ratio of 0.2 - 0.5:10, and the pH of the chitosan solution is 5;

[0020] Further, the dosage ratio of carbon black, buffer solution and chitosan solution in the modified carbon black is 2 - 5 g:50 mL:10 g.

[0021] A preparation method of a hydrogel - type color - stable facial mask base fabric includes the following steps:

[0022] Cut the bamboo fibers and then loosen and mix them with lignin - based hydrogel short fibers to obtain mixed short fibers, then card and lay the mixed short fibers to make a fiber web, and then pre - wet, high - pressure water - jet, dehydrate and dry the fiber web to obtain the hydrogel - type color - stable facial mask base fabric;

[0023] Further, the mass ratio of the bamboo fibers to the lignin - based hydrogel short fibers is 5 - 8:2 - 5.

[0024] The beneficial effects of the present invention:

[0025] The facial mask base fabric prepared by the present invention uses lignin - based hydrogel short fibers and bamboo fibers as the main raw materials, and is made into a fiber web through loosening, mixing, carding and laying, and then the fiber web is prepared through pre - wetting, high - pressure water - jetting, dehydrating and drying processes; this facial mask base fabric not only has excellent liquid - holding rate and liquid - retaining rate, can make the skin have a high water content after being applied to the skin, but also has excellent antioxidant performance, color stability and breaking strength.

[0026] The lignin-based hydrogel short fibers in the mask base fabric of the present invention are prepared from sodium lignosulfonate as the main raw material, and adding raw materials such as silicone, modified carbon black, and polyvinyl alcohol. Among them, lipoic acid with strong oxidizing property is introduced into sodium lignosulfonate, which can synergistically act with the phenolic hydroxyl groups in lignosulfonate to scavenge free radicals on the skin surface, reduce skin aging caused by oxidation. At the same time, the introduction of disulfide bonds can also increase the flexibility and elasticity of the mask base fabric, making it better fit the skin; while the introduction of silicone and benzene ring structure can improve the mechanical properties of the mask base fabric and avoid cracking or deformation caused by tearing and pulling during use. As a colorant, carbon black has poor dispersibility in the hydrogel, resulting in unstable coloring in the hydrogel. Coating carbon black with chitosan can form a protective layer around the carbon black particles by using the macromolecular structure of chitosan, increasing the steric hindrance between particles and preventing them from agglomerating, thereby improving the dispersibility. Detailed Embodiments

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Example 1: The modified carbon black is prepared by the following steps: Mix 2 g of carbon black, 50 mL of phosphate buffer solution with pH = 7.6, and 10 g of chitosan solution, stir for 2 h, centrifuge, wash, and dry to obtain the modified carbon black. The chitosan solution is prepared by mixing chitosan and water in a mass ratio of 0.2:10, and the pH of the chitosan solution is 5.

[0029] The lignin-based hydrogel short fibers are prepared by the following steps:

[0030] Step A1: Under nitrogen conditions, mix 0.1 mol of diethanolamine, 0.2 mol of p-aminobenzoic acid, and p-toluenesulfonic acid, heat to 100 °C and stir for 20 min. After adding cyclohexane, continue to heat to 140 °C and react for 1 h, then react under vacuum for 2 h, and purify to obtain the amino-terminated product. The p-toluenesulfonic acid and cyclohexane are 0.5% and 50% of the total mass of diethanolamine and p-aminobenzoic acid in sequence;

[0031] Step A2: Mix 10 g of sodium lignosulfonate, 2 g of the amino-terminated product, 0.3 g of sodium hydroxide, and 50 mL of water evenly, heat to 85 °C, dropwise add 4 mL of 25 wt% formaldehyde aqueous solution, carry out condensation reflux for 3 h, add 1 mol / L hydrochloric acid until no precipitation occurs, filter, wash, dry, and grind to obtain the pretreated sodium lignosulfonate;

[0032] Step A3: Mix 0.1 mol of lipoic acid, 4 g of sodium hydroxide, and 100 mL of water, stir for 30 min, add 0.1 mol of N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride and 0.05 mol of N-hydroxysuccinimide, stir for 1 h, then add 50 mL of a 2 wt% aqueous solution of pretreated lignosulfonate and 50 mL of ethanol, vigorously stir and react for 12 h, perform rotary evaporation to obtain sodium lignosulfonate disulfide;

[0033] Step A4: Mix 5 g of dimethylsiloxane, 2 g of methyltrimethoxysilane, 0.01 g of potassium hydroxide, 2 g of water, and 7 g of ethanol at 50 °C, stir for 2 h, then raise the temperature to 120 °C and react for 30 min, add 30 g of cyclohexane and 3 g of cation exchange resin, filter and distill to collect organosilicon; Mix 1 g of organosilicon, 10 g of sodium lignosulfonate disulfide, 0.5 g of modified carbon black, 3 g of polyvinyl alcohol, and 300 g of water to obtain a spinning solution, then spray the spinning solution through a spinning machine into a 35 wt% aqueous glutaraldehyde solution and soak for 2 h. After taking it out, perform freeze-drying and cutting to obtain lignin-based hydrogel short fibers.

[0034] Example 2: The modified carbon black is prepared by the following steps: Mix 3.5 g of carbon black, 50 mL of phosphate buffer solution with pH = 7.6, and 10 g of chitosan solution, stir for 2.5 h, centrifuge, wash, and dry to obtain modified carbon black. The chitosan solution is prepared by mixing chitosan and water in a mass ratio of 0.35:10, and the pH of the chitosan solution is 5.

[0035] The lignin-based hydrogel short fibers are prepared by the following steps:

[0036] Step A1: Under nitrogen conditions, mix 0.1 mol of diethanolamine, 0.2 mol of p-aminobenzoic acid, and p-toluenesulfonic acid, heat to 100 °C and stir for 20 min. After adding cyclohexane, continue to heat to 140 °C and react for 1 h, then react under vacuum for 2 h, and purify to obtain the amino-terminated product. p-Toluenesulfonic acid and cyclohexane are 0.5% and 50% of the total mass of diethanolamine and p-aminobenzoic acid, respectively;

[0037] Step A2: Mix 10 g of lignosulfonate, 3 g of the amino-terminated product, 0.4 g of sodium hydroxide, and 50 mL of water evenly, raise the temperature to 85 °C, dropwise add 5 mL of a 30 wt% aqueous formaldehyde solution, perform condensation reflux for 4 h, add 1 mol / L hydrochloric acid until no precipitation occurs, filter, wash, dry, and grind to obtain pretreated lignosulfonate;

[0038] Step A3: Mix 0.15 mol of lipoic acid, 6 g of sodium hydroxide and 100 mL of water, stir for 30 min, add 0.15 mol of N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride and 0.075 mol of N-hydroxysuccinimide, stir for 1.5 h, then add 50 mL of 3 wt% aqueous solution of pretreated lignosulfonate and 50 mL of ethanol, stir vigorously for 14 h, and perform rotary evaporation to obtain sodium lignosulfonate disulfide;

[0039] Step A4: Mix 7.5 g of dimethylsiloxane, 3 g of methyltrimethoxysilane, 0.01 g of potassium hydroxide, 2.5 g of water and 7 g of ethanol at 55 °C, stir for 3 h, then raise the temperature to 120 °C and react for 40 min, add 30 g of cyclohexane and 4.5 g of cation exchange resin, filter and distill to collect organosilicon; Mix 1.5 g of organosilicon, 12 g of sodium lignosulfonate disulfide, 0.75 g of modified carbon black, 4 g of polyvinyl alcohol and 300 g of water to obtain a spinning solution, then spray the spinning solution through a spinning machine into a 35 wt% aqueous solution of glutaraldehyde and soak for 2 h. After taking it out, perform freeze-drying and cutting to obtain lignin-based hydrogel short fibers.

[0040] Example 3: The modified carbon black is prepared by the following steps: Mix 5 g of carbon black, 50 mL of phosphate buffer solution with pH = 7.6 and 10 g of chitosan solution, stir for 3 h, centrifuge, wash and dry to obtain modified carbon black. The chitosan solution is prepared by mixing chitosan and water at a mass ratio of 0.5:10, and the pH of the chitosan solution is 5.

[0041] The lignin-based hydrogel short fibers are prepared by the following steps:

[0042] Step A1: Under nitrogen conditions, mix 0.1 mol of diethanolamine, 0.2 mol of p-aminobenzoic acid and p-toluenesulfonic acid, heat to 100 °C and stir for 20 min. After adding cyclohexane, continue to heat to 140 °C and react for 1 h, then react under vacuum for 2 h, and purify to obtain the amino-terminated product. The p-toluenesulfonic acid and cyclohexane are 0.5% and 50% of the total mass of diethanolamine and p-aminobenzoic acid, respectively;

[0043] Step A2: Mix 10 g of lignosulfonate, 4 g of the amino-terminated product, 0.5 g of sodium hydroxide and 50 mL of water evenly, raise the temperature to 85 °C, dropwise add 6 mL of 35 wt% formaldehyde aqueous solution, perform condensation reflux for 5 h, add 1 mol / L hydrochloric acid until no precipitation occurs, filter, wash, dry and grind to obtain the pretreated lignosulfonate;

[0044] Step A3: Mix 0.2 mol of lipoic acid, 8 g of sodium hydroxide, and 100 mL of water, stir for 30 min, add 0.2 mol of N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride and 0.1 mol of N-hydroxysuccinimide, stir for 2 h, then add 50 mL of a 4 wt% aqueous solution of pretreated lignosulfonate and 50 mL of ethanol, vigorously stir and react for 16 h, and perform rotary evaporation to obtain sodium lignosulfonate disulfide;

[0045] Step A4: Mix 10 g of dimethylsiloxane, 4 g of methyltrimethoxysilane, 0.01 g of potassium hydroxide, 3 g of water, and 7 g of ethanol at 60°C, stir for 4 h, then raise the temperature to 120°C and react for 50 min, add 30 g of cyclohexane and 6 g of cation exchange resin, filter and distill to collect the silicone; Mix 2 g of silicone, 15 g of sodium lignosulfonate disulfide, 1 g of modified carbon black, 5 g of polyvinyl alcohol, and 300 g of water to obtain a spinning solution, then spray the spinning solution through a spinning machine into a 35 wt% aqueous solution of glutaraldehyde and soak for 2 h. After taking it out, perform freeze-drying and cutting to obtain lignin-based hydrogel short fibers.

[0046] Example 4: A preparation method of a hydrogel-type color-stable facial mask base fabric includes the following steps:

[0047] Cut the bamboo fibers and perform carding and mixing with the lignin-based hydrogel short fibers prepared in Example 1 to obtain mixed short fibers. Then card and lay the mixed short fibers to make a fiber web. Then pre-wet, high-pressure waterjet, dehydrate, and dry the fiber web to obtain the hydrogel-type color-stable facial mask base fabric. The mass ratio of bamboo fibers to lignin-based hydrogel short fibers is 8:2.

[0048] Example 5: A preparation method of a hydrogel-type color-stable facial mask base fabric includes the following steps:

[0049] Cut the bamboo fibers and perform carding and mixing with the lignin-based hydrogel short fibers prepared in Example 2 to obtain mixed short fibers. Then card and lay the mixed short fibers to make a fiber web. Then pre-wet, high-pressure waterjet, dehydrate, and dry the fiber web to obtain the hydrogel-type color-stable facial mask base fabric. The mass ratio of bamboo fibers to lignin-based hydrogel short fibers is 7:3.

[0050] Example 6: A preparation method of a hydrogel-type color-stable facial mask base fabric includes the following steps:

[0051] Cut the bamboo fibers and perform carding and mixing with the lignin-based hydrogel short fibers prepared in Example 3 to obtain mixed short fibers. Then card and lay the mixed short fibers to make a fiber web. Then pre-wet, high-pressure waterjet, dehydrate, and dry the fiber web to obtain the hydrogel-type color-stable facial mask base fabric. The mass ratio of bamboo fibers to lignin-based hydrogel short fibers is 5:5.

[0052] Comparative Example 1: This comparative example is a facial mask base fabric, which is different from Example 6 in that the lignin-based hydrogel short fibers prepared in Example 3 are replaced by hydrogel short fibers A prepared by the following steps, and the rest are the same;

[0053] The above hydrogel short fibers A are prepared by the following steps: Mix 2 g of the silicone prepared in step A4 of Example 3, 15 g of sodium lignosulfonate, 1 g of modified carbon black, 5 g of polyvinyl alcohol, and 300 g of water to obtain a spinning solution, and then spray the spinning solution through a spinning machine into a 35 wt% aqueous glutaraldehyde solution and soak for 2 h. After taking out, freeze-dry and cut to obtain lignin-based hydrogel short fibers.

[0054] Comparative Example 2: This comparative example is a facial mask base fabric, which is different from Example 6 in that the lignin-based hydrogel short fibers prepared in Example 3 are replaced by hydrogel short fibers B prepared by the following steps, and the rest are the same;

[0055] The above hydrogel short fibers B are prepared by the following steps: Mix 2 g of the silicone prepared in step A4 of Example 3, 15 g of sodium lignosulfonate prepared in step A4, 1 g of carbon black, 5 g of polyvinyl alcohol, and 300 g of water to obtain a spinning solution, and then spray the spinning solution through a spinning machine into a 35 wt% aqueous glutaraldehyde solution and soak for 2 h. After taking out, freeze-dry and cut to obtain lignin-based hydrogel short fibers.

[0056] Comparative Example 3: This comparative example is a facial mask base fabric, which is different from Example 6 in that the lignin-based hydrogel short fibers prepared in Example 3 are replaced by hydrogel short fibers C prepared by the following steps, and the rest are the same;

[0057] The above hydrogel short fibers C are prepared by the following steps: Mix 2 g of the silicone prepared in step A4 of Example 3, 15 g of sodium lignosulfonate, 1 g of carbon black, 5 g of polyvinyl alcohol, and 300 g of water to obtain a spinning solution, and then spray the spinning solution through a spinning machine into a 35 wt% aqueous glutaraldehyde solution and soak for 2 h. After taking out, freeze-dry and cut to obtain lignin-based hydrogel short fibers.

[0058] Perform performance tests on the facial mask base fabrics prepared in Examples 4-6 and Comparative Examples 1-3:

[0059] Test for liquid holding rate and liquid retention rate: Place a sample with a weight of m 1 flat and immerse it in the facial mask special essence, soak it for 10 min to make it fully impregnated, take out the sample and suspend it to stand still until no essence drips, weigh and record it as m 2 , take out the sample and suspend it to stand still for 6 h, weigh and record it as m 3 , calculate the liquid holding rate (%) = (m 2 - m 1 ) / m 1 ×100%, liquid retention rate (%) = (m3 -m 2 ) / (m 2 -m 1 )×100%;

[0060] Moisture retention performance test: The mask base fabric fully impregnated for 10 min was respectively attached to the skin surface, and a skin moisture tester was used to measure the skin moisture content at different time points;

[0061] Antioxidant performance test: The mask base fabric was impregnated in a 1,1-diphenyl-2-picrylhydrazyl (DPPH) ethanol solution (0.05 mg / mL) in the dark at 37 °C for 10 min. The pure DPPH ethanol solution was used as a control group. The absorbance of the solution at 517 nm was measured by an ultraviolet spectrophotometer at a predetermined time. The DPPH free radical scavenging efficiency (%) = (A 1 -A 2 ) / A 1 ×100%, A 1 is the absorbance of the DPPH ethanol solution, and A 2 is the absorbance of the DPPH ethanol solution after adding the mask base fabric;

[0062] Color fastness stability test: The color fastness grade was tested with reference to the GB / T3920-2008 standard;

[0063] Breaking strength test: An electronic strength tester was used to test the breaking strength of the sample in the wet state with reference to the GB / T2428.3-2010 standard. The size of the sample was 5 cm × 30 cm (the length was greater than the clamping gauge distance of 20 cm), and the tensile speed was 100 mm / min; The sample was conditioned (wet state) according to the method of GB / T 6529-1008;

[0064] The test results are shown in Table 1:

[0065] Table 1: Performance test results

[0066]

[0067] As can be seen from Table 1, after the mask base fabric prepared by the present invention was tested for liquid holding rate, liquid retention rate, moisture retention performance, antioxidant performance, color fastness, and breaking strength, the base fabric had excellent liquid holding rate and liquid retention rate, and after being attached to the skin, the skin had a high moisture content. At the same time, it also had excellent antioxidant performance, color fastness stability, and breaking strength.

[0068] The above content is only an example and explanation of the concept of the present invention. Those skilled in the art of the present technology can make various modifications, supplements, or use similar methods to replace the specific embodiments described, as long as they do not deviate from the scope defined by the concept of the invention, they should fall within the protection scope of the present invention.

Claims

1. A hydrogel-type colored and stable facial mask base fabric, characterized in that: The fiber web is made by mixing lignin-based hydrogel short fibers and bamboo fibers and then processed by hydroentanglement; The lignin-based hydrogel short fibers are prepared by spinning a mixture of organosilicon, sodium disulfide lignin sulfonate, modified carbon black, polyvinyl alcohol and water; the sodium disulfide lignin sulfonate is prepared by reacting a pre-treated sodium lignin sulfonate aqueous solution with thioctic acid; the pre-treated sodium lignin sulfonate is prepared by reacting sodium lignin sulfonate, an amino-terminated product and formaldehyde; and the amino-terminated product is prepared by esterification of diethanolamine and p-aminobenzoic acid; The organosilicon is prepared by a mixed reaction of dimethylsiloxane and methyltrimethoxysilane; The modified carbon black is prepared by the reaction of carbon black and chitosan.

2. A hydrogel-type colored and stable facial mask base fabric according to claim 1, characterized in that: The lignin-based hydrogel short fibers are prepared by the following steps: Step A1, under nitrogen conditions, diethanolamine, p-aminobenzoic acid and p-toluenesulfonic acid were mixed, heated to 100°C and stirred for 20 minutes, cyclohexane was added, and the mixture was heated to 140°C for reaction for 1 hour, and then vacuum reacted for 2 hours, and purified to obtain an amino-terminated product; Step A2, mixing sodium lignin sulfonate, amino-terminated product, sodium hydroxide and water uniformly, heating to 85° C., adding 25-35 wt % formaldehyde aqueous solution dropwise, condensing and reflux for 3-5 h, adding 1 mol / L hydrochloric acid until no precipitation occurs, filtering, washing, drying and grinding to obtain pre-treated sodium lignin sulfonate; Step A3, mixing lipoic acid, sodium hydroxide and water for 30 minutes, adding N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide and mixing for 1-2 hours, then adding 2-4wt% pre-treated sodium lignin sulfonate aqueous solution and ethanol, stirring vigorously for 12-16 hours, and rotary evaporating to obtain sodium disulfide lignin sulfonate; Step A4, dimethylsiloxane, methyltrimethoxysilane, potassium hydroxide, water and ethanol are mixed and stirred at 50-60°C for 2-4h, then heated to 120°C for reaction for 30-50min, cyclohexane and cation exchange resin are added, filtered, distilled, and the organosilicon is collected; the organosilicon, sodium disulfide lignin sulfonate, modified carbon black, polyvinyl alcohol and water are mixed to obtain a spinning solution, and then the spinning solution is spun into a 35wt% glutaraldehyde aqueous solution through a spinning machine and immersed for 2h. After taking out, the solution is freeze-dried and cut to obtain lignin-based hydrogel short fibers.

3. A hydrogel-type colored and stable facial mask base fabric according to claim 2, characterized in that: In step A1, the molar ratio of diethanolamine to p-aminobenzoic acid is 1:2, and p-toluenesulfonic acid and cyclohexane are 0.5% and 50% of the total mass of diethanolamine and p-aminobenzoic acid, respectively.

4. A hydrogel-type colored and stable facial mask base fabric according to claim 2, characterized in that: In step A2, the usage ratio of sodium lignin sulfonate, amino-terminated product, sodium hydroxide, water and formaldehyde aqueous solution is 10 g: 2-4 g: 0.3-0.5 g: 50 mL: 4-6 mL.

5. The hydrogel-type colored and stable facial mask base fabric according to claim 2, characterized in that: In step A3, the amount ratio of lipoic acid, sodium hydroxide, water, N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride, N-hydroxysuccinimide, pre-treated sodium lignin sulfonate aqueous solution and ethanol is 0.1-0.2 mol:4-8 g:100 mL:0.1-0.2 mol:0.05-0.1 mol:50 mL:50 mL.

6. A hydrogel-type colored and stable facial mask base fabric according to claim 2, characterized in that: Step A4, the mass ratio of organosilicon, sodium disulfide lignin sulfonate, modified carbon black, polyvinyl alcohol and water in the lignin-based hydrogel short fibers is 1-2:10-15:0.5-1:3-5:

300.

7. The hydrogel-type coloring and stable facial mask base fabric according to claim 2, characterized in that: In step A4, the mass ratio of dimethylsiloxane, methyltrimethoxysilane, potassium hydroxide, water, ethanol, cyclohexane and cation exchange resin in the organosilicon is 5-10:2-4:0.01:2-3:7:30:3-6.

8. The hydrogel-type colored and stable facial mask base fabric according to claim 1, characterized in that: The modified carbon black is prepared by the following steps: mixing carbon black, buffer solution and chitosan solution, stirring for 2-3 hours, centrifuging, washing and drying to obtain the modified carbon black.

9. A hydrogel-type colored and stable facial mask base fabric according to claim 8, characterized in that: The amount ratio of carbon black, buffer and chitosan solution in the modified carbon black is 2-5g:50mL:10g, the buffer is a phosphate buffer with a pH value of 7.6, the chitosan solution is a mixture of chitosan and water with a mass ratio of 0.2-0.5:10, and the pH value of the chitosan solution is 5.

10. A method for preparing the hydrogel-type colored and stable facial mask base fabric according to any one of claims 1 to 9, characterized in that: The following steps are involved: The bamboo fibers are cut and opened and mixed with lignin-based hydrogel staple fibers to obtain mixed staple fibers. The mixed staple fibers are then combed and laid to obtain a fiber web. The fiber web is then pre-wetted, subjected to high-pressure water entanglement, dehydrated, and dried to obtain a hydrogel-type, colored and stable facial mask base fabric. The mass ratio of the bamboo fibers to the lignin-based hydrogel staple fibers is 5-8:2-5.

Images