High-liquid-holdup spunlace mask base material and preparation method thereof

Abstract

The invention discloses a high-liquid-holdup spunlace mask base material and a preparation method thereof, and belongs to the technical field of non-woven base cloth materials. The high-liquid-holdup spunlace mask base material is used for solving the technical problem that in the prior art, the moisture absorption performance, the liquid holdup performance and the size stability of a mask base material need to be further improved. The high-liquid-holdup spunlace mask base material is prepared from, by weight, 2-3 parts of moisture absorption modified polyester fibers, 6-8 parts of gelatin modified cotton fibers and 7-9 parts of modified polylactic acid fibers. The moisture absorption modified polyester fibers, the gelatin modified cotton fibers and the modified polylactic acid fibers are promoted to be entangled and fixed through spunlace curing to prepare the mask base material, so that the size stability and the biodegradability of the mask base material are effectively improved, and the moisture absorption and moisturizing performance of the mask base material is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of non-woven fabric materials, and in particular to a high-liquid-holding spunlace facial mask substrate and a preparation method thereof. Background Art

[0002] Facial masks are a category of skin care products that are used to hydrate the skin. They have multiple functions such as moisturizing, nourishing, improving appearance, and deep cleansing. They mainly work by loading essences such as collagen onto the mask base material, applying it to the skin surface, and utilizing the biological properties of the mask essence to deeply nourish and repair the skin.

[0003] The mask base materials in the existing technology are mostly made of natural cotton fibers or synthetic polyester fibers. Although natural cotton fibers have good skin-friendliness, their moisture absorption rate is slow and their water retention capacity is limited. In addition, the smooth fiber surface makes it easy for the mask essence to be lost, resulting in rapid evaporation or dripping of the essence during the mask application process, significantly reducing the utilization rate of the effective ingredients. In addition, during the mask processing process, the mask base material is easily deformed due to changes in moisture, resulting in a decrease in the fit of the mask or even local wrinkling, affecting the penetration of the mask essence. Although the existing spunlace non-woven fabric technology improves the strength of the base material by fiber entanglement, the interaction between the fibers is poor, which makes it difficult for the mask base material to balance the contradiction between moisture absorption expansion and dimensional stability.

[0004] In view of the technical defects in this aspect, a solution is now proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-liquid-holding spunlace mask substrate and a preparation method thereof, so as to solve the technical problem in the prior art that the hygroscopic performance, liquid retention and dimensional stability of high-liquid-holding spunlace mask substrates need to be further improved.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A high-liquid-holding spunlace facial mask substrate, comprising the following components in parts by weight: 2-3 parts of hygroscopic modified polyester fiber, 6-8 parts of gelatin-modified cotton fiber, and 7-9 parts of modified polylactic acid fiber;

[0008] The hygroscopic modified polyester fiber is prepared by melt spinning modified polyester. The diameter of the hygroscopic modified polyester fiber is 1.5-1.8 μm and the length is 2-10 mm.

[0009] The modified polylactic acid fiber is prepared by mixing sodium hyaluronate, polyvinyl alcohol and a dispersant, adding the mixture to a screw extruder, and melt-mixing for 3-5 minutes. Then, polylactic acid is added to the screw extruder, and the mixture is melt-extruded through the screw extruder, spun in a melt spinning machine, and then cut to prepare the modified polylactic acid fiber.

[0010] The preparation method of the modified polyester comprises the following steps: under the protection of an inert gas atmosphere, mixing terephthalic acid, ethylene glycol, and a catalyst, raising the temperature of the reaction system to 220-240° C., maintaining the temperature for reaction for 2-3 hours, adding hydroxysulfonate to the reaction system, evacuating the reaction system to a negative pressure of 80-120 Pa, raising the temperature of the reaction system to 260-270° C., maintaining the temperature and pressure for reaction for 55-65 minutes, reducing the negative pressure of the reaction system to 30-50 Pa, maintaining the temperature and pressure for reaction for 2.5-3.5 hours, and performing post-processing to obtain the modified polyester.

[0011] The synthetic reaction mechanism of modified polyester is:

[0012]

[0013] During the reaction, under a catalyst and high temperature environment, the carboxyl groups on the terephthalic acid molecules undergo esterification reaction with the hydroxyl groups on the ethylene glycol molecules. By controlling the molar amounts of terephthalic acid and ethylene glycol, a polyester prepolymer with carboxyl end-capping is prepared. Then, the polyester prepolymer undergoes esterification chain extension with hydroxy sulfonate to prepare a modified polyester with sulfonate-modified polyester chain segments.

[0014] Furthermore, the weight ratio of the polylactic acid, sodium hyaluronate, polyvinyl alcohol and dispersant is 10-12:4-5:2-3:0.1-0.15, the dispersant is stearate, the screw extruder is a twin-screw extruder, and the temperatures of the six temperature sections of the twin-screw extruder from the feed end to the discharge end are 230°C, 235°C, 235°C, 235°C, 235°C, and 240°C, respectively. The melt spinning temperature is 250°C, the spinneret has 48 holes with a pore size of 0.1mm, the melt spinning machine adopts side blowing cooling, the side blowing speed is 0.5m / s, the temperature is 20°C, the hot drawing temperature is 80°C, the drawing ratio is 1:10, and a rotary blade cutting machine is used for cutting.

[0015] Furthermore, in the preparation process of the modified polyester, the usage ratio of terephthalic acid, ethylene glycol, and hydroxysulfonate is 1.5 mol:1 mol:0.5 mol, the weight ratio of terephthalic acid and catalyst is 10:0.15, the catalyst is composed of ethylene glycol antimony and triphenyl phosphite in a weight ratio of 2:1, and the hydroxysulfonate is 1,5-dihydroxypentane-1,5-disulfonic acid disodium. The post-treatment includes: after the reaction is completed, discharging the polymer while hot, pelletizing it after water cooling, and drying it to a moisture content of less than 0.01% to prepare the modified polyester.

[0016] Furthermore, the preparation method of the hygroscopic modified polyester fiber is as follows: the modified polyester is added to a single-screw extruder, the temperatures of the three temperature sections of the single-screw extruder from the feed end to the discharge end are 250°C, 260°C, and 265°C, respectively, the melt spinning temperature is set to 290°C, the spinneret has 48 holes with a pore size of 0.1 mm, and side-blowing cooling is adopted, the side-blowing wind speed is 0.5 m / s, and the temperature is 20°C. After the fiber ejected from the spinneret is cooled and formed, it is hot-stretched at a stretching ratio of 1:5 at a temperature of 80°C, and then cut with a rotary blade cutter to prepare the hygroscopic modified polyester fiber.

[0017] Furthermore, the preparation method of gelatin-modified cotton fiber is as follows: gelatin and purified water are mixed and stirred, the temperature of the reaction system is raised to 70-80°C, the mixture is kept warm and stirred until the system is dissolved, and then oxidized cotton fiber is added to the reaction system, ultrasonically dispersed for 90-110 minutes, and post-treated to obtain gelatin-modified cotton fiber.

[0018] The synthetic reaction mechanism of gelatin-modified cotton fiber is:

[0019]

[0020] During the reaction, gelatin, which is rich in primary amine groups and amide groups, can undergo a Schiff base reaction with the aldehyde groups on the oxidized cotton fibers under high temperature, forming an imine bond through aldehyde-amine condensation, thereby attaching the gelatin to the cotton fibers in the form of a chemical bond to prepare gelatin-modified cotton fibers.

[0021] Furthermore, the usage ratio of the gelatin, purified water and oxidized cotton fiber is 1g:20mL:3-4g, and the post-treatment includes: after the reaction is completed, the temperature of the reaction system is lowered to room temperature, filtered, the filter cake is washed twice with anhydrous ethanol and then dried, and the filter cake is transferred to a drying oven at a temperature of 60-70°C and dried to constant weight to obtain gelatin-modified cotton fiber.

[0022] Furthermore, the preparation method of the oxidized cotton fiber is as follows: in a light-shielding environment, the cotton fiber is placed in an oxidizing liquid at a temperature of 45-55° C., immersed in the oxidizing liquid for 140-160 minutes, and post-treated to obtain the oxidized cotton fiber.

[0023] The synthetic reaction mechanism of oxidized cotton fiber is:

[0024]

[0025] During the reaction, sodium periodate attacks the C2 and C3 positions on the cotton fiber unit, forming a cis-vicinal diol structure. The reaction causes the carbon-carbon bond (C2-C3 bond) connecting C2 and C3 to break and be oxidized, so that the C2 and C3 positions are oxidized into aldehyde groups. Sodium periodate itself is reduced to sodium iodate. After weak acid washing, the reaction is terminated and the iodate by-product is removed to avoid strong acid-induced hemiacetal hydrolysis and destruction of the fiber morphology, thereby preparing oxidized cotton fibers with aldehyde-modified cotton fibers.

[0026] Furthermore, the solid-liquid ratio of the cotton fiber to the oxidizing liquid is 1:20, the oxidizing liquid is a 2-3 g / L sodium periodate solution, and the post-treatment includes: after the reaction is completed, filtering, washing the filter cake with 0.1 mol / L hydrochloric acid three times and then washing it with purified water to neutrality, and then transferring the filter cake to a drying oven at a temperature of 70-80°C and drying it to constant weight to obtain oxidized cotton fiber.

[0027] A method for preparing a high liquid holding rate spunlace mask substrate comprises mixing hygroscopic modified polyester fiber, gelatin modified cotton fiber and modified polylactic acid fiber, opening and combing the fibers in sequence, and then slicing the fibers at a rate of 20-30 g / m 2 The fiber web is cross-lapped at a paving density of 100 nm to obtain a fiber web, the fiber web is hydroentangled and reinforced, and the fiber web is dried to obtain a facial mask base material.

[0028] Furthermore, during the hydroentanglement reinforcement process, the hydroentanglement pressure is 15-25MPa, and the number of hydroentanglement passes is 3-5. After the hydroentanglement reinforcement is completed, the excess water is removed by negative pressure suction and liquid rolling, and the fiber web is transferred to a drying oven at a temperature of 70-80°C and dried to constant weight to obtain a facial mask substrate.

[0029] The present invention has the following beneficial effects:

[0030] 1. The present invention provides a high liquid retention spunlace mask substrate, which is obtained by mixing and paving hygroscopic modified polyester fibers, gelatin modified cotton fibers, and modified polylactic acid fibers and then spunlace-fixing them, so that the fibers are entangled to form a mask substrate with hygroscopic modified polyester fibers as the skeleton and modified polylactic acid fibers toughening the gelatin modified cotton fibers. When preparing the hygroscopic modified polyester fibers, strongly hydrophilic sulfonates are introduced into their molecular chains to cooperate with fibers with high specific surface areas to accelerate capillary penetration, increase the rate of water penetration, and improve the hygroscopicity of the material. The high stability of the polyester chain segments can play a role of rigid support in the fabric fibers, thereby improving the dimensional stability of the mask substrate before and after moisture absorption and avoiding dimensional swelling and deformation.

[0031] 2. The present invention provides a high liquid retention spunlace mask substrate. Cotton fibers are selected as the substrate, the cotton fibers are oxidized, and then coated and modified with gelatin to enhance the bonding between the fibers, thereby improving the dimensional stability of the material. The gelatin-modified cotton fibers have good biodegradability and cooperate with the modified polylactic acid fibers to effectively enhance the biodegradability of the mask substrate.

[0032] 3. The present invention provides a high liquid retention spunlace mask substrate, in which polylactic acid is reinforced with sodium hyaluronate and polyvinyl alcohol to improve the hygroscopic properties of the modified polylactic acid fiber, and the modified polylactic acid fiber cooperates with the hygroscopic modified polyester fiber and the gelatin-modified cotton fiber to further enhance the hygroscopic and moisturizing properties of the fabric base cloth. When preparing the hygroscopic modified polyester fiber and the modified polylactic acid fiber, the molecular orientation degree in the fiber is increased by thermal stretching, thereby improving the crystallinity of the fiber. The high crystallinity limits the slippage of the molecular chain and increases the dimensional stability of the fiber in a wet state. Hydrogen bonds are formed between the modified polylactic acid fiber, the hygroscopic modified polyester fiber and the gelatin-modified cotton fiber, thereby enhancing the interaction force between the fibers and further enhancing the dimensional stability of the mask substrate. DETAILED DESCRIPTION

[0033] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In this application, the cotton fiber is pure cotton flakes from Xinjiang Uygur Autonomous Region;

[0035] In this application, gelatin is food grade gelatin;

[0036] In this application, sodium hyaluronate is cosmetic grade sodium hyaluronate;

[0037] In this application, polyvinyl alcohol is selected from Guangzhou Yinhuan Chemical Co., Ltd. and is named PVA-205, with an alcoholysis degree of 86.5-89.0%, a viscosity of 4.6-5.4 mPa·s, a non-volatile content of 0.3%, and a pH value of 5-7;

[0038] In this application, polylactic acid was selected from Bashifu (Shanghai) Biomedical Technology Co., Ltd., with an active ingredient content of 99% and a density of 1.25-1.28 g / cm 3 .

[0039] Example 1

[0040] This embodiment provides a method for preparing a spunlace facial mask substrate with a high liquid holdup, comprising the following steps:

[0041] S1. Preparation of hygroscopic modified polyester fiber

[0042] mixing antimony ethylene glycol and triphenyl phosphite in a weight ratio of 2:1 to obtain a catalyst;

[0043] Weigh: 249.2 g of terephthalic acid, 62.1 g of ethylene glycol, and 3.74 g of a catalyst are added to a reaction flask protected by argon and stirred. The temperature of the reaction flask is raised to 220° C. and the reaction is kept warm for 2 hours. 154.1 g of disodium 1,5-dihydroxypentane-1,5-disulfonate is added to the reaction flask, the negative pressure of the reaction flask is reduced to 80 Pa, the temperature is increased to 260° C., and the reaction is kept warm and pressure maintained for 55 minutes. The negative pressure of the reaction flask is reduced to 30 Pa, and the reaction is kept warm and pressure maintained for 2.5 hours. The polymer is discharged while hot, pelletized after water cooling, and transferred to a drying oven at a temperature of 80° C. and dried to a moisture content of less than 0.01% to prepare a modified polyester;

[0044] The modified polyester is added to a single-screw extruder, and the temperatures of the three temperature sections of the single-screw extruder from the feed end to the discharge end are 250° C., 260° C., and 265° C., respectively. The modified polyester melt-extruded by the single screw enters a melt spinning machine, and the melt spinning temperature is set to 290° C. The modified polyester is ejected through a spinneret with a pore size of 0.1 mm and a hole number of 48 holes, and is cooled by side blowing. After the fibers ejected from the spinneret are cooled and formed, the spinned fibers are hot-stretched at a drawing ratio of 1:5 in an environment at a temperature of 80° C., and then cut by a rotary blade cutter to prepare hygroscopic modified polyester fibers with a diameter of 1.5-1.8 μm and a length of 2-10 mm, wherein the wind speed of the side blowing is 0.5 m / s and the temperature is 20° C.

[0045] S2. Preparation of gelatin-modified cotton fiber

[0046] Cotton fiber and 2 g / L sodium periodate solution were added to a light-shielded reaction flask at a solid-liquid ratio of 1:20, so that the cotton fiber was completely immersed in the sodium periodate solution. The temperature of the reaction flask was raised to 45°C and kept warm for 140 minutes. The temperature of the reaction flask was lowered to room temperature and filtered. The filter cake was washed three times with 0.1 mol / L hydrochloric acid and then washed with purified water until it was neutral. The filter cake was then transferred to a drying oven at a temperature of 70°C and dried to constant weight to obtain oxidized cotton fiber.

[0047] Weigh: 10 g of gelatin and 200 mL of purified water are added to a reaction flask and stirred. The temperature of the reaction flask is raised to 70°C and stirred until the gelatin is dissolved. Then, 30 g of oxidized cotton fiber is added to the reaction flask and ultrasonically dispersed for 90 minutes. The temperature of the reaction flask is lowered to room temperature and filtered. The filter cake is washed twice with anhydrous ethanol and then dried. The filter cake is transferred to a drying oven at 60°C and dried to constant weight to obtain gelatin-modified cotton fiber.

[0048] S3. Preparation of modified polylactic acid fiber

[0049] Weigh 4 parts of sodium hyaluronate, 2 parts of polyvinyl alcohol and 0.1 parts of dispersant sodium stearate by weight, mix and add to a twin-screw extruder, melt mix for 3 minutes, add 10 parts of polylactic acid to the twin-screw extruder, melt extrude through the twin-screw extruder and spin in a melt spinning machine, set the melt spinning temperature to 250°C, spray through a spinneret with a pore size of 0.1mm and 48 holes, use side blowing to cool, cool the fiber ejected from the spinneret into shape, and then heat at room temperature. In an environment of 80°C, hot stretching is carried out at a stretching ratio of 1:10, and then the fiber is cut by a rotary blade cutter to prepare modified polylactic acid fiber with a diameter of 1.5-1.8 μm and a length of 3-6 mm. The temperatures of the six temperature zones of the twin-screw extruder from the feed end to the discharge end are 230°C, 235°C, 235°C, 235°C, 235°C, and 240°C, respectively. The side wind speed is 0.5 m / s and the temperature is 20°C.

[0050] S4. Preparation of facial mask base material

[0051] Weigh by weight: 2 parts of hygroscopic modified polyester fiber, 6 parts of gelatin modified cotton fiber, and 7 parts of modified polylactic acid fiber, mix them, open and card them in sequence, and then press them at 20g / m 2 The fiber web is cross-laid with a paving density of 100 nm to obtain a fiber web, which is hydroentangled and dried to obtain a facial mask substrate. During the hydroentanglement, the hydroentanglement pressure is 15 MPa and the number of hydroentanglement passes is 3. After the hydroentanglement is completed, the excess water is removed by negative pressure suction and liquid pressing with a liquid pressing roller, and the fiber web is transferred to a drying oven at a temperature of 70°C and dried to a constant weight to obtain a facial mask substrate.

[0052] Example 2

[0053] This embodiment provides a method for preparing a spunlace facial mask substrate with a high liquid holdup, comprising the following steps:

[0054] S1. Preparation of hygroscopic modified polyester fiber

[0055] mixing antimony ethylene glycol and triphenyl phosphite in a weight ratio of 2:1 to obtain a catalyst;

[0056] Weigh: 249.2 g of terephthalic acid, 62.1 g of ethylene glycol, and 3.74 g of a catalyst are added to a reaction flask protected by argon and stirred. The temperature of the reaction flask is raised to 230° C. and the reaction is kept warm for 2.5 hours. 154.1 g of disodium 1,5-dihydroxypentane-1,5-disulfonate is added to the reaction flask, the negative pressure of the reaction flask is evacuated to 100 Pa, the temperature is raised to 265° C., and the reaction is kept warm and pressure maintained for 60 minutes. The negative pressure of the reaction flask is evacuated to 40 Pa, and the reaction is kept warm and pressure maintained for 3.0 hours. The polymer is discharged while hot, water-cooled, and then pelletized. It is transferred to a drying oven at a temperature of 80° C. and dried to a moisture content of less than 0.01% to prepare a modified polyester;

[0057] The modified polyester is added to a single-screw extruder, and the temperatures of the three temperature sections of the single-screw extruder from the feed end to the discharge end are 250° C., 260° C., and 265° C., respectively. The modified polyester melt-extruded by the single screw enters a melt spinning machine, and the melt spinning temperature is set to 290° C. The modified polyester is ejected through a spinneret with a pore size of 0.1 mm and a hole number of 48 holes, and is cooled by side blowing. After the fibers ejected from the spinneret are cooled and formed, the spinned fibers are hot-stretched at a drawing ratio of 1:5 in an environment at a temperature of 80° C., and then cut by a rotary blade cutter to prepare hygroscopic modified polyester fibers with a diameter of 1.5-1.8 μm and a length of 2-10 mm, wherein the wind speed of the side blowing is 0.5 m / s and the temperature is 20° C.

[0058] S2. Preparation of gelatin-modified cotton fiber

[0059] Cotton fiber and 2.5 g / L sodium periodate solution were added to a light-shielded reaction flask at a solid-liquid ratio of 1:20, so that the cotton fiber was completely immersed in the sodium periodate solution. The temperature of the reaction flask was raised to 50° C. and the immersion was maintained for 150 minutes. The temperature of the reaction flask was lowered to room temperature and filtered. The filter cake was washed three times with 0.1 mol / L hydrochloric acid and then washed with purified water until it was neutral. The filter cake was then transferred to a drying oven at a temperature of 75° C. and dried to constant weight to obtain oxidized cotton fiber.

[0060] Weigh: 10 g of gelatin and 200 mL of purified water, add them to a reaction flask and stir, raise the temperature of the reaction flask to 75°C, keep stirring until the gelatin is dissolved, then add 35 g of oxidized cotton fiber to the reaction flask, keep warm and ultrasonically disperse for 100 minutes, lower the temperature of the reaction flask to room temperature, filter, wash the filter cake twice with anhydrous ethanol and then dry it, transfer the filter cake to a drying oven at a temperature of 65°C, and dry it to constant weight to obtain gelatin-modified cotton fiber.

[0061] S3. Preparation of modified polylactic acid fiber

[0062] Weigh 4.5 parts of sodium hyaluronate, 2.5 parts of polyvinyl alcohol and 0.13 parts of dispersant calcium stearate by weight, mix and add to a twin-screw extruder, melt mix for 4 minutes, add 11 parts of polylactic acid to the twin-screw extruder, melt extrude through the twin-screw extruder and spin in a melt spinning machine, set the melt spinning temperature to 250 ° C, and spray through a spinneret with a pore size of 0.1 mm and 48 holes, use side blowing to cool, and cool the fiber sprayed from the spinneret to form , under a temperature of 80°C, hot stretching is carried out at a stretching ratio of 1:10, and then cut by a rotary blade cutter to prepare modified polylactic acid fibers with a diameter of 1.5-1.8μm and a length of 3-6mm. Among them, the temperatures of the six temperature zones of the twin-screw extruder from the feed end to the discharge end are 230°C, 235°C, 235°C, 235°C, 235°C, and 240°C, respectively. The side wind speed is 0.5m / s and the temperature is 20°C.

[0063] S4. Preparation of facial mask base material

[0064] Weigh by weight: 2.5 parts of hygroscopic modified polyester fiber, 7 parts of gelatin modified cotton fiber, and 8 parts of modified polylactic acid fiber, mix them, open and card them in sequence, and then press them at 25g / m 2 The fiber web is cross-laid with a paving density of 100 nm to obtain a fiber web, which is hydroentangled and dried to obtain a facial mask substrate. During the hydroentanglement, the hydroentanglement pressure is 20 MPa and the number of hydroentanglement passes is 4. After the hydroentanglement is completed, the excess water is removed by negative pressure suction and liquid pressing with a liquid pressing roller, and the fiber web is transferred to a drying oven at a temperature of 75°C and dried to a constant weight to obtain a facial mask substrate.

[0065] Example 3

[0066] This embodiment provides a method for preparing a spunlace facial mask substrate with a high liquid holdup, comprising the following steps:

[0067] S1. Preparation of hygroscopic modified polyester fiber

[0068] mixing antimony ethylene glycol and triphenyl phosphite in a weight ratio of 2:1 to obtain a catalyst;

[0069] Weigh: 249.2 g of terephthalic acid, 62.1 g of ethylene glycol, and 3.74 g of a catalyst are added to a reaction flask protected by argon and stirred. The temperature of the reaction flask is raised to 240° C. and the reaction is kept warm for 3 hours. 154.1 g of disodium 1,5-dihydroxypentane-1,5-disulfonate is added to the reaction flask, the reaction flask is evacuated to 120 Pa, the temperature is raised to 270° C., and the reaction is kept warm and pressure maintained for 65 minutes. The reaction flask is evacuated to 50 Pa and the reaction is kept warm and pressure maintained for 3.5 hours. The polymer is discharged while hot, water-cooled, and pelletized. It is transferred to a drying oven at 80° C. and dried to a moisture content of less than 0.01% to prepare a modified polyester;

[0070] The modified polyester is added to a single-screw extruder, and the temperatures of the three temperature sections of the single-screw extruder from the feed end to the discharge end are 250° C., 260° C., and 265° C., respectively. The modified polyester melt-extruded by the single screw enters a melt spinning machine, and the melt spinning temperature is set to 290° C. The modified polyester is ejected through a spinneret with a pore size of 0.1 mm and a hole number of 48 holes, and is cooled by side blowing. After the fibers ejected from the spinneret are cooled and formed, the spinned fibers are hot-stretched at a drawing ratio of 1:5 in an environment at a temperature of 80° C., and then cut by a rotary blade cutter to prepare hygroscopic modified polyester fibers with a diameter of 1.5-1.8 μm and a length of 2-10 mm, wherein the wind speed of the side blowing is 0.5 m / s and the temperature is 20° C.

[0071] S2. Preparation of gelatin-modified cotton fiber

[0072] Cotton fiber and 3 g / L sodium periodate solution were added to a light-shielded reaction flask at a solid-liquid ratio of 1:20, so that the cotton fiber was completely immersed in the sodium periodate solution. The temperature of the reaction flask was raised to 55°C and kept warm for 160 minutes. The temperature of the reaction flask was lowered to room temperature and filtered. The filter cake was washed three times with 0.1 mol / L hydrochloric acid and then washed with purified water until it was neutral. The filter cake was then transferred to a drying oven at 80°C and dried to constant weight to obtain oxidized cotton fiber.

[0073] Weigh: 10 g of gelatin and 200 mL of purified water are added to a reaction flask and stirred. The temperature of the reaction flask is raised to 80°C, and the mixture is stirred until the gelatin is dissolved. Then, 40 g of oxidized cotton fiber is added to the reaction flask, and ultrasonic dispersion is performed for 110 minutes. The temperature of the reaction flask is lowered to room temperature, and the filter cake is filtered. The filter cake is washed twice with anhydrous ethanol and then dried. The filter cake is transferred to a drying oven at a temperature of 70°C and dried to constant weight to obtain gelatin-modified cotton fiber.

[0074] S3. Preparation of modified polylactic acid fiber

[0075] Weigh by weight: 5 parts of sodium hyaluronate, 3 parts of polyvinyl alcohol and 0.15 parts of dispersant zinc stearate, mix and add to a twin-screw extruder, melt mix for 5 minutes, add 12 parts of polylactic acid to the twin-screw extruder, melt extrude through the twin-screw extruder and spin in a melt spinning machine, set the melt spinning temperature to 250 ° C, and spray through a spinneret with a pore size of 0.1 mm and 48 holes, use side blowing to cool, and cool the fiber ejected from the spinneret into shape, then Under an environment of temperature of 80°C, hot stretching is carried out at a stretching ratio of 1:10, and then the fiber is cut by a rotary blade cutter to prepare modified polylactic acid fiber with a diameter of 1.5-1.8 μm and a length of 3-6 mm. The temperatures of the six temperature zones of the twin-screw extruder from the feed end to the discharge end are 230°C, 235°C, 235°C, 235°C, 235°C, and 240°C, respectively. The side wind speed is 0.5 m / s and the temperature is 20°C.

[0076] S4. Preparation of facial mask base material

[0077] Weigh by weight: 3 parts of hygroscopic modified polyester fiber, 8 parts of gelatin modified cotton fiber, and 9 parts of modified polylactic acid fiber, mix them, open and card them in sequence, and then press them at 30g / m 2 The fiber web is cross-laid with a paving density of 100 nm to obtain a fiber web, which is hydroentangled and dried to obtain a facial mask substrate. During the hydroentanglement, the hydroentanglement pressure is 25 MPa and the number of hydroentanglement passes is 5. After the hydroentanglement is completed, the excess water is removed by negative pressure suction and liquid pressing with a liquid pressing roller, and the fiber web is transferred to a drying oven at a temperature of 80°C and dried to a constant weight to obtain a facial mask substrate.

[0078] Comparative Example 1

[0079] The difference between this comparative example and Example 3 is that in step S1, 1,5-pentanediol is used in an equal amount to replace disodium 1,5-dihydroxypentane-1,5-disulfonate.

[0080] Comparative Example 2

[0081] The difference between this comparative example and Example 3 is that step S2 is eliminated, and the gelatin-modified cotton fiber in step S4 is replaced by the cotton fiber in step S2.

[0082] Comparative Example 3

[0083] The difference between this comparative example and Example 3 is that in step S3, sodium hyaluronate is not added.

[0084] Performance testing:

[0085] The mass of the mask substrates prepared in Examples 1-3 and Comparative Examples 1-3 before and after liquid absorption was measured with reference to the standard GB / T 24218.6-2010 "Test methods for textiles - Part 6: Determination of absorbency", and the mass of the mask substrates before and after liquid absorption was calculated according to the formula Calculate the moisture absorption of the sample, where m1 is the weight of the sample after absorbing liquid, and m0 is the weight of the sample before absorbing liquid; continue to hang the sample after absorbing liquid according to the standard for 20 minutes, and measure the weight of the sample m2 according to the formula , calculate the liquid holding rate of the sample, where m2 is the weight of the sample after hanging for 20 minutes after absorbing the liquid;

[0086] The mask substrates prepared in Examples 1-3 and Comparative Examples 1-3 were placed in purified water at a temperature of 60°C and kept completely immersed for 30 minutes. The dimensions of the mask substrates before and after immersion were measured and calculated according to the formula Calculate the dimensional change rate of the sample, where S1 is the surface area of the film substrate after immersion, and S0 is the surface area of the film substrate before immersion;

[0087] The biodegradability of the mask substrate samples prepared in Examples 1-3 and Comparative Examples 1-3 was determined according to the standard GB / T 33616-2017 “Evaluation of the biodegradability of textile nonwovens - Determination of carbon dioxide release”.

[0088] The specific test results are shown in Table 1 below.

[0089] Table 1-Performance test data of the sample

[0090] Data Analysis:

[0091] A comparative analysis of the data in Table 1 above shows that the moisture absorption capacity of the facial mask substrate prepared by the present invention reaches 1465%, the liquid holding rate reaches 89.8%, the dimensional change rate is reduced to 1.41%, and the biodegradability rate reaches 82.5%. All performance test data are better than those of the comparative example, indicating that the present invention promotes the entanglement and fixation of hygroscopic modified polyester fiber, gelatin-modified cotton fiber, and modified polylactic acid fiber to prepare the facial mask substrate through hydroentanglement curing, which not only effectively improves its dimensional stability and biodegradability, but also improves its moisture absorption and moisturizing properties.

[0092] The above contents are merely examples and explanations of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

[0093] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0094] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high liquid retention spunlace facial mask substrate, characterized in that: The high liquid retention spunlace mask substrate comprises the following components in parts by weight: 2-3 parts of hygroscopic modified polyester fiber, 6-8 parts of gelatin modified cotton fiber, and 7-9 parts of modified polylactic acid fiber; The hygroscopic modified polyester fiber is prepared by melt spinning modified polyester. The diameter of the hygroscopic modified polyester fiber is 1.5-1.8 μm and the length is 2-10 mm. The modified polylactic acid fiber is prepared by mixing sodium hyaluronate, polyvinyl alcohol and a dispersant, adding the mixture to a screw extruder, and melt-mixing for 3-5 minutes. Then, polylactic acid is added to the screw extruder, and the mixture is melt-extruded through the screw extruder, spun in a melt spinning machine, and then cut to prepare the modified polylactic acid fiber. The preparation method of the modified polyester comprises the following steps: under the protection of an inert gas atmosphere, mixing terephthalic acid, ethylene glycol, and a catalyst, raising the temperature of the reaction system to 220-240° C., maintaining the temperature for reaction for 2-3 hours, adding hydroxysulfonate to the reaction system, evacuating the reaction system to a negative pressure of 80-120 Pa, raising the temperature of the reaction system to 260-270° C., maintaining the temperature and pressure for reaction for 55-65 minutes, reducing the negative pressure of the reaction system to 30-50 Pa, maintaining the temperature and pressure for reaction for 2.5-3.5 hours, and performing post-processing to obtain the modified polyester.

2. The high liquid holdup spunlace facial mask substrate according to claim 1, characterized in that: The weight ratio of the polylactic acid, sodium hyaluronate, polyvinyl alcohol and dispersant is 10-12:4-5:2-3:0.1-0.15, the dispersant is stearate, the screw extruder is a twin-screw extruder, the temperatures of the six temperature sections of the twin-screw extruder from the feed end to the discharge end are 230°C, 235°C, 235°C, 235°C, 235°C, and 240°C, respectively, the melt spinning temperature is 250°C, the spinneret has 48 holes with a pore diameter of 0.1mm, the melt spinning machine adopts side blowing cooling, the side blowing speed is 0.5m / s, the temperature is 20°C, the hot drawing temperature is 80°C, the drawing ratio is 1:10, and a rotary blade cutter is used for cutting.

3. The high liquid holdup spunlace facial mask substrate according to claim 1, characterized in that: In the preparation process of the modified polyester, the usage ratio of terephthalic acid, ethylene glycol and hydroxysulfonate is 1.5 mol:1 mol:0.5 mol, and the weight ratio of terephthalic acid to catalyst is 10: 0.15, the catalyst is composed of antimony ethylene glycol and triphenyl phosphite in a weight ratio of 2:1, the hydroxy sulfonate is disodium 1,5-dihydroxypentane-1,5-disulfonate, and the post-treatment comprises: after the reaction is completed, discharging the polymer while hot, pelletizing it after water cooling, and drying it to a moisture content of less than 0.01% to prepare a modified polyester.

4. The high liquid holdup spunlace facial mask substrate according to claim 1, characterized in that: The preparation method of the hygroscopic modified polyester fiber is as follows: the modified polyester is added into a single-screw extruder, the temperatures of the three temperature sections of the single-screw extruder from the feed end to the discharge end are 250°C, 260°C, and 265°C, respectively; the melt spinning temperature is set to 290°C; the spinneret has 48 holes with a hole diameter of 0.1 mm; side blowing cooling is adopted, the side blowing speed is 0.5 m / s, and the temperature is 20°C; the fiber ejected from the spinneret is cooled and formed, and then hot-stretched at a drawing ratio of 1:5 at a temperature of 80°C, and then cut by a rotary blade cutter to prepare the hygroscopic modified polyester fiber.

5. The high liquid holdup spunlace facial mask substrate according to claim 1, characterized in that: The preparation method of gelatin-modified cotton fiber is as follows: gelatin and purified water are mixed and stirred, the temperature of the reaction system is increased to 70-80°C, the mixture is kept warm and stirred until the system is dissolved, and then oxidized cotton fiber is added to the reaction system, ultrasonically dispersed for 90-110 minutes, and post-treated to obtain gelatin-modified cotton fiber.

6. The high liquid holdup spunlace facial mask substrate according to claim 5, characterized in that: The amount ratio of the gelatin, purified water and oxidized cotton fiber is 1g:20mL:3-4g. The post-treatment includes: after the reaction is completed, the temperature of the reaction system is lowered to room temperature, filtration is performed, the filter cake is washed twice with anhydrous ethanol and then dried, and the filter cake is transferred to a drying oven at a temperature of 60-70°C and dried to constant weight to obtain gelatin-modified cotton fiber.

7. The high liquid holdup spunlace facial mask substrate according to claim 5, characterized in that: The preparation method of the oxidized cotton fiber comprises the following steps: placing the cotton fiber in an oxidizing liquid with a temperature of 45-55 DEG C under a light-shielding environment, preserving the temperature and immersing the cotton fiber in an oxidizing liquid for 140-160 minutes, and performing post-treatment to obtain the oxidized cotton fiber.

8. The high liquid holdup spunlace facial mask substrate according to claim 7, characterized in that: The solid-liquid ratio of the cotton fiber to the oxidizing liquid is 1:20, and the oxidizing liquid is a 2-3 g / L sodium periodate solution. The post-treatment includes: after the reaction is completed, filtering, washing the filter cake with 0.1 mol / L hydrochloric acid three times and then washing it with purified water to neutrality, and then transferring the filter cake to a drying oven at a temperature of 70-80°C and drying it to constant weight to obtain oxidized cotton fiber.

9. A method for preparing a high liquid holdup spunlace facial mask substrate according to any one of claims 1 to 8, characterized in that: After mixing the hygroscopic modified polyester fiber, gelatin modified cotton fiber and modified polylactic acid fiber, they are opened and combed in sequence, and then the fibers are pressed at 20-30g / m 2 The fiber web is cross-lapped at a paving density of 100 nm to obtain a fiber web, the fiber web is hydroentangled and reinforced, and the fiber web is dried to obtain a facial mask base material.

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