Moisture absorption and sweat releasing mask bottom pad capable of reducing breathing resistance of medical mask and preparation process

Abstract

The invention relates to the technical field of clothing fabrics, in particular to a moisture-absorbing and sweat-releasing mask bottom pad capable of reducing breathing resistance of a medical mask and a preparation process thereof.The mask bottom pad is formed by weaving composite yarn, the composite yarn is formed by weaving surface yarn, middle yarn and bottom yarn in a stacked mode, the surface yarn forms a surface layer after stacking forming, and the middle yarn forms a surface layer after stacking forming; the middle yarn forms a middle layer, and the bottom yarn forms a bottom layer; the surface yarn is made of cation polyester; the middle yarn is made of superfine denier polyester; hydrophilic modified polyester is adopted as the bottom yarn. According to the mask bottom mat, the three kinds of yarn fibers are woven in a stacked mode, the prepared fabric sequentially forms three yarn layers, the bottom layer absorbs water vapor in a second mode, the middle layer rapidly diffuses the water vapor to the cloth cover, and the surface layer rapidly evaporates the water vapor, so that the mask bottom mat is light, thin and breathable, has the moisture absorption and sweat releasing functions and can be used in cooperation with a medical mask, breathing resistance of the medical mask is reduced, and the service life of the mask is prolonged. The breathing burden caused by wearing the medical mask is relieved, and the wearing comfort of the medical mask is improved.

Description

Technical Field

[0001] The invention relates to the technical field of clothing fabrics, and in particular to a moisture-absorbing and perspiration-wicking mask base pad capable of reducing the breathing resistance of a medical mask and a preparation process thereof. Background Art

[0002] Medical masks are designed to effectively prevent the invasion of pathogens, especially small microorganisms like novel viruses (typically between 2 and 5 microns). However, this results in relatively high respiratory resistance, and long-term wear can impair respiratory function, manifesting as shortness of breath and chest tightness. Breathability is positively correlated with respiratory resistance, so higher filtration efficiency directly impacts breathability. Therefore, these shortcomings cannot be addressed through the mask itself. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the present invention aims to provide a moisture-absorbing and perspiration-wicking mask base pad that can reduce the breathing resistance of medical masks. The mask base pad is woven by stacking three yarn fibers to form a three-layer fabric. The surface layer is made of cationic polyester, the middle layer is made of ultra-fine denier polyester, and the bottom layer is made of hydrophilic modified polyester. The three-thread plain knit structure achieves layer distribution. The bottom layer absorbs water vapor in seconds, the middle layer quickly diffuses water vapor to the fabric surface, and the surface layer quickly evaporates water vapor. The mask base pad is light, thin and breathable, has good skin-friendliness and has moisture-absorbing and perspiration-wicking functions, meeting the use requirements of masks. Among them, the mask base pad is used in conjunction with a medical mask. When in use, the mask base pad is worn first and then the medical mask. The mask base pad can reduce the breathing resistance of the medical mask, alleviate the breathing burden caused by wearing the medical mask, and improve the wearing comfort of the medical mask.

[0004] Another object of the present invention is to provide a preparation process for a moisture-absorbing and perspiration-wicking mask base pad that can reduce the breathing resistance of a medical mask. The operation and control are convenient, the quality is stable, the production efficiency is high, and the production cost is low. By strictly controlling each step and condition parameter, the prepared fabric can be made soft and comfortable, skin-friendly and breathable, moisture-absorbing and perspiration-wicking, which can reduce the breathing resistance of the medical mask, has high stability, and is suitable for large-scale industrial production.

[0005] The object of the present invention is achieved through the following technical scheme: a moisture-absorbing and perspiration-wicking mask base pad that can reduce the breathing resistance of a medical mask, the mask base pad being woven from a composite yarn, the composite yarn being woven from a face veil, an intermediate yarn and a bottom yarn in a stacked manner, the face veil forming a surface layer, the intermediate yarn forming a middle layer, and the bottom yarn forming a bottom layer after stacking and forming; the face veil is made of cationic polyester with a fineness of 45-75D and a pore number of 45-75F; the intermediate yarn is made of ultrafine denier polyester with a fineness of 20-50D and a pore number of 45-75F; the bottom yarn is made of hydrophilic modified polyester with a fineness of 45-75D and a pore number of 45-75F.

[0006] The invention discloses a moisture-absorbing and perspiration-releasing mask base pad capable of reducing the breathing resistance of a medical mask. The base pad is woven by blending three yarn fibers to sequentially form three yarn layers, wherein the surface layer is made of cationic polyester, the middle layer is made of ultrafine denier polyester, and the bottom layer is made of hydrophilic modified polyester with a three-thread plain knit structure, thereby producing a "silk-covered-silk" three-thread plain weave fabric. Specifically, the cationic polyester used in the surface layer has a positive charge and can effectively reduce the generation of static electricity; the cation can effectively prevent the attachment of stains due to its positive surface charge, and the cationic polyester can achieve a quick-drying function due to its hydrophobicity; the ultrafine denier polyester used in the middle layer has an efficient moisture diffusion function; the hydrophilic modified polyester fiber used in the bottom layer has a hydrophilic group on its surface and can quickly absorb moisture, so that the bottom layer absorbs water vapor in seconds, the middle layer quickly diffuses the water vapor to the cloth surface, and the surface layer quickly evaporates the water vapor, thereby making the mask base pad light, thin and breathable, having good skin-friendliness and the function of moisture absorption and perspiration, and meeting the use requirements of the mask. Moreover, the mask base pad of the present invention can be used in conjunction with a medical mask, which can reduce the breathing resistance of the medical mask and effectively reduce the direct contact of the face with the mask. Therefore, it is an effective method for people who are allergic to the mask material. At the same time, the fit of the mask base pad is better than that of the medical mask. Because the fabric of the mask base pad is thinner and softer, it can reduce friction on the face. Moreover, the mask base pad is a knitted fabric and can be repeatedly washed and recycled. While improving the shortcoming of the low reuse rate of the mask, it has an environmental protection effect and strong functionality.

[0007] Furthermore, the cross-section of the face yarn is circular; the cross-section of the middle yarn is circular; and the cross-section of the bottom yarn is cross-shaped. The cross-shaped polyester has four grooves, which have a moisture-wicking and water-dissipating effect. It can quickly absorb moisture and sweat from the skin surface and drain them to the outer layer for evaporation, keeping the body dry and comfortable. It has excellent moisture absorption, moisture conduction, and quick-drying functions.

[0008] Furthermore, the hydrophilic modified polyester is prepared by the following steps:

[0009] A1: Dip the polyester into the water-based polyurethane emulsion at 80-100°C for 40-50 minutes;

[0010] A2: Dry the polyester after padding in step A1 at 115-130°C for 3-8 minutes;

[0011] A3: The polyester dried in step A2 is subjected to steam treatment at 100-110° C. for 3-8 minutes to obtain a hydrophilic modified polyester.

[0012] The hydrophilically modified polyester of the present invention is made by coating the polyester with a polyurethane resin. When treated with an aqueous polyurethane emulsion, the aqueous polyurethane emulsion swells in high-temperature water, forming a hydrophilic film on the polyester surface, enhancing its moisture-wicking and perspiration-wicking properties. After padding, the treated polyester is dried to remove the unfilmed portion of the polyester that adheres to the aqueous polyurethane emulsion. Subsequent steam treatment promotes the adhesion of the film to the polyester in the presence of high-temperature steam.

[0013] Furthermore, the mask base pad is a knitted plain fabric, which is woven from several minimum pattern loops. The minimum pattern loops include two loop-forming systems: a first loop-forming system and a second loop-forming system. Each loop-forming system includes an upper needle disc and a lower needle cylinder. The upper needle disc is a low-speed knitting position A, and the lower needle cylinder is a high-speed knitting position B. The upper and lower needles of the first loop-forming system are both loop-forming; the upper and lower needles of the second loop-forming system are both floating yarns. Three yarns are fed simultaneously into the first loop-forming system or the second loop-forming system at different angles, resulting in a "silk-covered silk" three-thread plain weave fabric that is light, thin, and breathable.

[0014] Furthermore, in step 1, the aqueous polyurethane emulsion is prepared by the following steps:

[0015] B1: Mix polyethylene glycol, isophorone diisocyanate and 2,2-dimethylolpropionic acid, stir and react at 75-85°C for 4-5 hours, then lower the temperature to 40-50°C, add ethylenediamine until neutral, and prepare a polyurethane prepolymer;

[0016] B2: Add modified sodium alginate, hydroxypropyl-β-cyclodextrin and deionized water to the prepolymer prepared in step B1 and perform ultrasonic dispersion for 0.3-0.8 h to obtain an aqueous polyurethane emulsion.

[0017] Furthermore, the molar ratio of isophorone diisocyanate, polyethylene glycol and 2,2-dimethylolpropionic acid is 2.8-3.2:1:1.

[0018] Furthermore, the catalyst is at least one of dibutyltin dilaurate and stannous octoate, and the amount of the catalyst added is 3-5% of the total mass of isophorone diisocyanate, polyethylene glycol and 2,2-dimethylolpropionic acid.

[0019] Furthermore, in step B2, the amount of the modified sodium alginate added is 20-28% of the total mass of isophorone diisocyanate, polyethylene glycol and 2,2-dimethylolpropionic acid.

[0020] Furthermore, in step B2, the amount of hydroxypropyl-β-cyclodextrin added is 8-16% of the total mass of isophorone diisocyanate, polyethylene glycol and 2,2-dihydroxymethylpropionic acid.

[0021] Furthermore, in step B2, the amount of the deionized water added is 35-45% of the total mass of the modified sodium alginate, hydroxypropyl-β-cyclodextrin, isophorone diisocyanate, polyethylene glycol and 2,2-dihydroxymethylpropionic acid.

[0022] The present invention prepares an aqueous polyurethane emulsion through the above steps, and strictly controls the mixing ratio and condition parameters of each step, so that the prepared aqueous polyurethane emulsion has high stability, high bonding degree with polyester, high film-forming property, and forms a stable polymer film on the surface of the polyester. The polyurethane prepolymer can be extensively cross-linked with modified sodium alginate and hydroxypropyl-β-cyclodextrin through hydrogen bonding and condensation reaction, and the modified sodium alginate and hydroxypropyl-β-cyclodextrin have good hydrophilicity, can enhance the hygroscopicity of polyester, and enable the prepared mask base pad to have the function of moisture absorption and perspiration removal, thereby reducing the breathing resistance of the medical mask.

[0023] Furthermore, the preparation method of the modified sodium alginate comprises the following steps:

[0024] C1: First, 0.3-0.8 g of sodium alginate was dissolved in 500 mL of deionized water, and 5.2-5.6 g of NaIO4 solution was added. The mixture was stirred in the dark for 3.5-4.5 h. 0.3-0.8 g of ethylene glycol was added to terminate the reaction. The reaction product was dialyzed against deionized water for 2-3 days and lyophilized to obtain oxidized sodium alginate.

[0025] C2: Dissolve 0.3-0.8 g of oxidized alginate in 50 mL of deionized water, add 20-24 g of aminopolyethylene glycol hydroxyethanol solution dropwise, react at 45-55°C for 3-4 hours, dialyze in deionized water for 6-7 days using a dialysis membrane with a relative molecular weight cutoff of 3500, and lyophilize to obtain modified sodium alginate.

[0026] Furthermore, in step C1, the mass fraction of the NaIO4 solution is 8-12%.

[0027] Furthermore, in step C2, the mass fraction of the aminopolyethylene glycol hydroxyethanol solution is 11-13%. Preferably, the polyethylene glycol in the aminopolyethylene glycol hydroxyethanol is polyethylene glycol 400.

[0028] The present invention prepares modified sodium alginate through the above steps, and strictly controls the mixing ratio and condition parameters of each step, so that the prepared modified sodium alginate has high stability. The sodium alginate has strong hygroscopicity, but is not acid- and alkali-resistant. The present invention uses a mild Schiff base reaction to modify the sodium alginate, grafts aminopolyethylene glycol hydroxyethanol into the molecular structure of the sodium alginate, and introduces reactive groups while retaining the hydrophilicity of the sodium alginate. This not only enhances the compatibility with the polyurethane prepolymer, but also improves the acid- and alkali-resistant performance of the sodium alginate.

[0029] Another object of the present invention is achieved by the following technical solution: a preparation process of a moisture-absorbing and perspiration-wicking mask base pad that can reduce the breathing resistance of a medical mask as described above, comprising the following steps:

[0030] S1: Weaving: Use a three-thread single-jersey knitting machine to weave the face yarn, middle yarn and bottom yarn separately to produce the grey cloth;

[0031] S2: pre-setting treatment of the grey cloth: subjecting the grey cloth obtained in step S1 to a heat setting treatment by heating to obtain a pre-set grey cloth;

[0032] S3: Boiling the cloth: The predetermined shaped cloth obtained in step S2 is pre-treated with a pre-treatment agent and then boiled in hot water at a temperature of 90-100° C. for 25-35 minutes;

[0033] S4: peracidification: adding the grey cloth after the cloth boiling treatment in step S3 into glacial acetic acid and soaking it at a temperature of 15-20°C for 10-20 minutes;

[0034] S5: Scouring: adding the acidified grey cloth obtained in step S4 to hot water at a temperature of 75-85°C for heat treatment for 8-12 minutes;

[0035] S6: Softening: soaking the scour-proof fabric obtained in step S5 in a moisture-absorbing quick-drying agent and a cracking agent to soften the fabric at a temperature of 30-50° C. for 15-25 minutes;

[0036] S7: Shaping treatment: The softened fabric obtained in step S6 is heated and heat-set to obtain a moisture-absorbing and perspiration-wicking mask base pad that can reduce the breathing resistance of the medical mask.

[0037] Furthermore, in step S1, the three-thread single-jersey knitting machine used is a knitting structure of a three-thread single-jersey knitting machine with patent publication number CN211420467U. Specifically, the face yarn, middle yarn and bottom yarn are fed to the knitting needles through the first yarn feeding hole, the second yarn feeding hole and the third yarn feeding hole at different inclination angles, so that the three threads overlap to divide the fabric into upper, middle and lower layers. The needle cylinder is driven to rotate around the knitting needle triangle seat by a rotating drive mechanism, so that the needle butt of the knitting needle in the needle groove moves along the trajectory of the knitting groove of the knitting needle triangle seat. Under the action of the knitting groove, the knitting needle moves up and down in the needle groove to crochet the cloth. Through the cooperation of the knitting needle and the knitting needle triangle seat, the cloth is woven over and over again.

[0038] Furthermore, in step S3, the amount of the pretreatment agent added is 4-6 g / L, wherein the pretreatment agent comprises the following raw materials in parts by weight: 2-4 parts of soap oil, 0.8-1.2 parts of degreasing agent, and 0.8-1.2 parts of sodium carbonate. Preferably, the degreasing agent is TX-1109.

[0039] Furthermore, the method for preparing the pretreatment agent comprises the following steps: at room temperature, by weight, mixing soap oil, degreasing agent and sodium carbonate uniformly and setting aside.

[0040] Furthermore, in step S4, the amount of glacial acetic acid added is 0.8-1.2 g / L.

[0041] Furthermore, in step S6, the mass fraction of the hygroscopic fast-drying agent is 3-5%, and the amount of the cracking agent added is 0.2-0.4 g / L. Preferably, the hygroscopic fast-drying agent is ICS, and the cracking agent is Invatex AC.

[0042] Furthermore, in the step S1, the predetermined setting temperature of the heating heat setting treatment is 75-85°C, and the predetermined setting speed is 15-25 m / min; in the step S7, the setting temperature is 110-130°C, and the setting speed is 12-20 m / min.

[0043] The invention discloses a preparation process of a moisture-absorbing and perspiration-wicking mask base pad capable of reducing the breathing resistance of a medical mask. The process has the advantages of convenient operation and control, stable quality, high production efficiency, and low production cost. By strictly controlling each step and condition parameter, the prepared fabric can be made soft, comfortable, skin-friendly, and breathable, thereby reducing the breathing resistance of the medical mask, having high stability, and being suitable for large-scale industrial production.

[0044] By pre-setting the woven grey fabric, the polyester in the fabric can be fixed, eliminating weaving stress, stabilizing the fabric dimensions, and preventing uneven or excessive shrinkage of the polyester in subsequent processes. The grey fabric is then boiled to remove impurities from the fibers, improve fabric properties, and prepare for subsequent processing. Next, an acid treatment is performed to neutralize the residual sodium carbonate alkali remaining after boiling. Low-temperature peracidification helps suppress acetic acid volatilization, ensuring treatment uniformity. Simultaneously, the low temperature causes the fibers to shrink, temporarily closing surface micropores and reducing the acid penetration depth to protect fiber strength. Scouring is then performed to remove residual acetic acid and hydrolysis products from the fabric, preventing pH fluctuations during the finishing phase. This also relaxes the polyester fibers and partially opens the micropores closed in step S4, preparing for the penetration of the moisture-absorbing and quick-drying agent. Next, the fabric softens. A cracking agent gently etches the fiber surface, creating anchor points for the finishing agent. The moisture-absorbing and quick-drying agent, which contains both hydrophilic and hydrophobic segments, absorbs water molecules through hydrogen bonds, further enhancing hygroscopicity. The hydrophobic segments form water-repellent channels, accelerating water evaporation. Finally, the fabric undergoes a setting treatment, where the moisture-absorbing and quick-drying agent is fixed at high temperature. The setting temperature and tension control the porosity, enhancing the fabric's breathability.

[0045] The beneficial effects of the present invention are as follows: the present invention can reduce the breathing resistance of medical masks by absorbing and wicking the mask base pad. The fabric is formed by blending and weaving three yarn fibers to form a three-layer yarn layer. The surface layer is made of cationic polyester, the middle layer is made of ultra-fine denier polyester, and the bottom layer is made of hydrophilic modified polyester. The three-thread plain knit structure achieves layer distribution. The bottom layer absorbs water vapor quickly, the middle layer quickly diffuses water vapor to the fabric surface, and the surface layer quickly evaporates water vapor. The mask base pad is light, thin and breathable, has good skin-friendliness and moisture absorption and perspiration function, and meets the use requirements of masks. Among them, the mask base pad is used in conjunction with a medical mask to reduce the breathing resistance of the medical mask, alleviate the respiratory burden caused by wearing the medical mask, and improve the wearing comfort of the medical mask.

[0046] The invention discloses a preparation process of a moisture-absorbing and perspiration-wicking mask base pad capable of reducing the breathing resistance of a medical mask. The process has the advantages of convenient operation and control, stable quality, high production efficiency, and low production cost. By strictly controlling each step and condition parameter, the prepared fabric can be made soft and comfortable, skin-friendly and breathable, and can absorb moisture and wick away perspiration, thereby reducing the breathing resistance of the medical mask, having high stability, and being suitable for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of the front structure of the mask base pad;

[0048] Figure 2 This is a schematic diagram of the back structure of the mask base pad;

[0049] Figure 3 A step-by-step diagram for using a mask base pad with a medical surgical mask. DETAILED DESCRIPTION

[0050] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the embodiments. The contents mentioned in the embodiments are not intended to limit the present invention.

[0051] Example 1

[0052] The invention discloses a moisture-absorbing and perspiration-wicking mask base pad capable of reducing the breathing resistance of a medical mask. The mask base pad is woven from composite yarns, wherein the composite yarns are woven from a face yarn, an intermediate yarn, and a bottom yarn in a stacked manner. After stacking and forming, the face yarn forms a surface layer, the intermediate yarn forms a middle layer, and the bottom yarn forms a bottom layer.

[0053] Furthermore, the face yarn is made of cationic polyester with a fineness of 50D and a pore size of 72F; the middle yarn is made of ultrafine denier polyester with a fineness of 30D and a pore size of 72F; and the bottom yarn is made of hydrophilic modified polyester with a fineness of 50D and a pore size of 72F.

[0054] Furthermore, the hydrophilic modified polyester is prepared by the following steps:

[0055] A1: Dip the polyester into a water-based polyurethane emulsion at 85°C for 45 minutes;

[0056] A2: Dry the polyester after padding in step A1 at 120°C for 6 minutes;

[0057] A3: The polyester dried in step A2 is steam-treated at 100° C. for 8 minutes to obtain a hydrophilic modified polyester.

[0058] Furthermore, the mask base pad is a knitted plain fabric, which is woven from several minimum pattern cycles. The minimum pattern cycle includes two loop forming systems, namely the first loop forming system and the second loop forming system. Each loop forming system includes an upper needle disc and a lower needle cylinder. The upper needle disc is a low-speed weaving position A, and the lower needle cylinder is a high-speed weaving position B. The upper needles and lower needles of the first loop forming system are both loop forming tissues; the upper needles and lower needles of the second loop forming system are both floating thread tissues.

[0059] Furthermore, in step 1, the aqueous polyurethane emulsion is prepared by the following steps:

[0060] B1: Polyethylene glycol, isophorone diisocyanate, and 2,2-dimethylolpropionic acid were mixed and stirred at 80°C for 4 hours. The temperature was then lowered to 45°C, and ethylenediamine was added until neutral to prepare a polyurethane prepolymer.

[0061] B2: Add modified sodium alginate, hydroxypropyl-β-cyclodextrin and deionized water to the prepolymer prepared in step B1 and perform ultrasonic dispersion for 0.6 h to obtain an aqueous polyurethane emulsion.

[0062] Furthermore, the molar ratio of isophorone diisocyanate, polyethylene glycol and 2,2-dimethylolpropionic acid is 3:1:1.

[0063] Furthermore, the catalyst is dibutyltin dilaurate, and the amount of the catalyst added is 4% of the total mass of isophorone diisocyanate, polyethylene glycol and 2,2-dimethylolpropionic acid.

[0064] Furthermore, in step B2, the amount of the modified sodium alginate added is 20% of the total mass of isophorone diisocyanate, polyethylene glycol and 2,2-dimethylolpropionic acid.

[0065] Furthermore, in step B2, the amount of hydroxypropyl-β-cyclodextrin added is 8% of the total mass of isophorone diisocyanate, polyethylene glycol and 2,2-dihydroxymethylpropionic acid.

[0066] Furthermore, in step B2, the amount of the deionized water added is 40% of the total mass of the modified sodium alginate, hydroxypropyl-β-cyclodextrin, isophorone diisocyanate, polyethylene glycol and 2,2-dihydroxymethylpropionic acid.

[0067] Furthermore, the preparation method of the modified sodium alginate comprises the following steps:

[0068] C1: First, 0.5 g of sodium alginate was dissolved in 500 mL of deionized water, and 5.4 g of NaIO4 solution was added. The mixture was stirred in the dark for 4 h. 0.5 g of ethylene glycol was added to terminate the reaction. The reaction product was dialyzed against deionized water for 3 days and lyophilized to obtain oxidized sodium alginate.

[0069] C2: Dissolve 0.5 g of oxidized alginate in 50 mL of deionized water, add 22 g of aminopolyethylene glycol hydroxyethanol solution (12.5%) dropwise, react at 45-55°C for 3-4 hours, dialyze in deionized water for 6-7 days using a dialysis membrane with a relative molecular mass cutoff of 3500, and lyophilize to obtain modified sodium alginate.

[0070] Furthermore, in step C1, the mass fraction of the NaIO4 solution is 10%.

[0071] Furthermore, in step C2, the mass fraction of the aminopolyethylene glycol hydroxyethanol solution is 12.5%, wherein the polyethylene glycol in the aminopolyethylene glycol hydroxyethanol is polyethylene glycol 400.

[0072] A preparation process of a moisture-absorbing and perspiration-wicking mask base pad capable of reducing the breathing resistance of a medical mask as described above comprises the following steps:

[0073] S1: Weaving: Use a three-thread single-jersey knitting machine to weave the face yarn, middle yarn and bottom yarn separately to produce the grey cloth;

[0074] S2: pre-setting treatment of the grey cloth: subjecting the grey cloth obtained in step S1 to a heat setting treatment by heating to obtain a pre-set grey cloth;

[0075] S3: Boiling the cloth: The predetermined shaped cloth obtained in step S2 is pre-treated with a pre-treatment agent and then boiled in hot water at a temperature of 90-100° C. for 25-35 minutes;

[0076] S4: peracidification: adding the grey cloth after the cloth boiling treatment in step S3 into glacial acetic acid and soaking it at a temperature of 18°C ​​for 15 minutes;

[0077] S5: Scouring: adding the acidified grey cloth obtained in step S4 into hot water at a temperature of 80° C. and heat treating for 10 minutes;

[0078] S6: Softening: soaking the scour-proofed fabric obtained in step S5 in a moisture-absorbing quick-drying agent and a cracking agent to soften the fabric at 40° C. for 20 minutes;

[0079] S7: Shaping treatment: The softened fabric obtained in step S6 is heated and heat-set to obtain a moisture-absorbing and perspiration-wicking mask base pad that can reduce the breathing resistance of the medical mask.

[0080] Furthermore, in step S3, the amount of the pretreatment agent added is 5 g / L, wherein the pretreatment agent comprises the following raw materials in parts by weight: 3 parts of soap oil, 1 part of degreasing agent, and 1 part of sodium carbonate. Preferably, the degreasing agent is TX-1109.

[0081] Furthermore, the method for preparing the pretreatment agent comprises the following steps: at room temperature, by weight, mixing soap oil, degreasing agent and sodium carbonate uniformly and setting aside.

[0082] Furthermore, in step S4, the amount of glacial acetic acid added is 12 g / L.

[0083] Furthermore, in step S6, the mass fraction of the hygroscopic fast-drying agent is 4%, the amount of the cracking agent added is 0.3 g / L, the hygroscopic fast-drying agent is ICS, and the cracking agent is Invatex AC.

[0084] Furthermore, in the step S1, the predetermined setting temperature of the heating heat setting treatment is 80°C, and the predetermined setting speed is 20 m / min; in the step S7, the setting temperature is 120°C, and the setting speed is 16 m / min.

[0085] Example 2

[0086] The invention discloses a moisture-absorbing and perspiration-wicking mask base pad capable of reducing the breathing resistance of a medical mask. The mask base pad is woven from composite yarns, wherein the composite yarns are woven from a face yarn, an intermediate yarn, and a bottom yarn in a stacked manner. After stacking and forming, the face yarn forms a surface layer, the intermediate yarn forms a middle layer, and the bottom yarn forms a bottom layer.

[0087] Furthermore, the face yarn is made of cationic polyester with a fineness of 50D and a pore size of 72F; the middle yarn is made of ultrafine denier polyester with a fineness of 30D and a pore size of 72F; and the bottom yarn is made of hydrophilic modified polyester with a fineness of 50D and a pore size of 72F.

[0088] Furthermore, the hydrophilic modified polyester is prepared by the following steps:

[0089] A1: Dip the polyester into a water-based polyurethane emulsion at 85°C for 45 minutes;

[0090] A2: Dry the polyester after padding in step A1 at 120°C for 6 minutes;

[0091] A3: The polyester dried in step A2 is steam-treated at 100° C. for 8 minutes to obtain a hydrophilic modified polyester.

[0092] Furthermore, the mask base pad is a knitted plain fabric, which is woven from several minimum pattern cycles. The minimum pattern cycle includes two loop forming systems, namely the first loop forming system and the second loop forming system. Each loop forming system includes an upper needle disc and a lower needle cylinder. The upper needle disc is a low-speed weaving position A, and the lower needle cylinder is a high-speed weaving position B. The upper needles and lower needles of the first loop forming system are both loop forming tissues; the upper needles and lower needles of the second loop forming system are both floating thread tissues.

[0093] Furthermore, in step 1, the aqueous polyurethane emulsion is prepared by the following steps:

[0094] B1: Polyethylene glycol, isophorone diisocyanate, and 2,2-dimethylolpropionic acid were mixed and stirred at 80°C for 4 hours. The temperature was then lowered to 45°C, and ethylenediamine was added until neutral to prepare a polyurethane prepolymer.

[0095] B2: Add modified sodium alginate, hydroxypropyl-β-cyclodextrin and deionized water to the prepolymer prepared in step B1 and perform ultrasonic dispersion for 0.6 h to obtain an aqueous polyurethane emulsion.

[0096] Furthermore, in step B2, the amount of the modified sodium alginate added is 24% of the total mass of isophorone diisocyanate, polyethylene glycol and 2,2-dihydroxymethylpropionic acid.

[0097] Furthermore, in step B2, the amount of hydroxypropyl-β-cyclodextrin added is 12% of the total mass of isophorone diisocyanate, polyethylene glycol and 2,2-dihydroxymethylpropionic acid.

[0098] A preparation process of a moisture-absorbing and perspiration-wicking mask base pad capable of reducing the breathing resistance of a medical mask as described above comprises the following steps:

[0099] S1: Weaving: Use a three-thread single-jersey knitting machine to weave the face yarn, middle yarn and bottom yarn separately to produce the grey cloth;

[0100] S2: pre-setting treatment of the grey cloth: subjecting the grey cloth obtained in step S1 to a heat setting treatment by heating to obtain a pre-set grey cloth;

[0101] S3: Boiling the cloth: The predetermined shaped cloth obtained in step S2 is pre-treated with a pre-treatment agent and then boiled in hot water at a temperature of 90-100° C. for 25-35 minutes;

[0102] S4: peracidification: adding the grey cloth after the cloth boiling treatment in step S3 into glacial acetic acid and soaking it at a temperature of 18°C ​​for 15 minutes;

[0103] S5: Scouring: adding the acidified grey cloth obtained in step S4 into hot water at a temperature of 80° C. and heat treating for 10 minutes;

[0104] S6: Softening: soaking the scour-proofed fabric obtained in step S5 in a moisture-absorbing quick-drying agent and a cracking agent to soften the fabric at 40° C. for 20 minutes;

[0105] S7: Shaping treatment: The softened fabric obtained in step S6 is heated and heat-set to obtain a moisture-absorbing and perspiration-wicking mask base pad that can reduce the breathing resistance of the medical mask.

[0106] Example 3

[0107] The invention discloses a moisture-absorbing and perspiration-wicking mask base pad capable of reducing the breathing resistance of a medical mask. The mask base pad is woven from composite yarns, wherein the composite yarns are woven from a face yarn, an intermediate yarn, and a bottom yarn in a stacked manner. After stacking and forming, the face yarn forms a surface layer, the intermediate yarn forms a middle layer, and the bottom yarn forms a bottom layer.

[0108] Furthermore, the face yarn is made of cationic polyester with a fineness of 50D and a pore size of 72F; the middle yarn is made of ultrafine denier polyester with a fineness of 30D and a pore size of 72F; and the bottom yarn is made of hydrophilic modified polyester with a fineness of 50D and a pore size of 72F.

[0109] Furthermore, the hydrophilic modified polyester is prepared by the following steps:

[0110] A1: Dip the polyester into a water-based polyurethane emulsion at 85°C for 45 minutes;

[0111] A2: Dry the polyester after padding in step A1 at 120°C for 6 minutes;

[0112] A3: The polyester dried in step A2 is steam-treated at 100° C. for 8 minutes to obtain a hydrophilic modified polyester.

[0113] Furthermore, the mask base pad is a knitted plain fabric, which is woven from several minimum pattern cycles. The minimum pattern cycle includes two loop forming systems, namely the first loop forming system and the second loop forming system. Each loop forming system includes an upper needle disc and a lower needle cylinder. The upper needle disc is a low-speed weaving position A, and the lower needle cylinder is a high-speed weaving position B. The upper needles and lower needles of the first loop forming system are both loop forming tissues; the upper needles and lower needles of the second loop forming system are both floating thread tissues.

[0114] Furthermore, in step 1, the aqueous polyurethane emulsion is prepared by the following steps:

[0115] B1: Polyethylene glycol, isophorone diisocyanate, and 2,2-dimethylolpropionic acid were mixed and stirred at 80°C for 4 hours. The temperature was then lowered to 45°C, and ethylenediamine was added until neutral to prepare a polyurethane prepolymer.

[0116] B2: Add modified sodium alginate, hydroxypropyl-β-cyclodextrin and deionized water to the prepolymer prepared in step B1 and perform ultrasonic dispersion for 0.6 h to obtain an aqueous polyurethane emulsion.

[0117] Furthermore, in step B2, the amount of the modified sodium alginate added is 28% of the total mass of isophorone diisocyanate, polyethylene glycol and 2,2-dihydroxymethylpropionic acid.

[0118] Furthermore, in step B2, the amount of hydroxypropyl-β-cyclodextrin added is 16% of the total mass of isophorone diisocyanate, polyethylene glycol and 2,2-dihydroxymethylpropionic acid.

[0119] A preparation process of a moisture-absorbing and perspiration-wicking mask base pad capable of reducing the breathing resistance of a medical mask as described above comprises the following steps:

[0120] S1: Weaving: Use a three-thread single-jersey knitting machine to weave the face yarn, middle yarn and bottom yarn separately to produce the grey cloth;

[0121] S2: pre-setting treatment of the grey cloth: subjecting the grey cloth obtained in step S1 to a heat setting treatment by heating to obtain a pre-set grey cloth;

[0122] S3: Boiling the cloth: The predetermined shaped cloth obtained in step S2 is pre-treated with a pre-treatment agent and then boiled in hot water at a temperature of 90-100° C. for 25-35 minutes;

[0123] S4: peracidification: adding the grey cloth after the cloth boiling treatment in step S3 into glacial acetic acid and soaking it at a temperature of 18°C ​​for 15 minutes;

[0124] S5: Scouring: adding the acidified grey cloth obtained in step S4 into hot water at a temperature of 80° C. and heat treating for 10 minutes;

[0125] S6: Softening: soaking the scour-proofed fabric obtained in step S5 in a moisture-absorbing quick-drying agent and a cracking agent to soften the fabric at 40° C. for 20 minutes;

[0126] S7: Shaping treatment: The softened fabric obtained in step S6 is heated and heat-set to obtain a moisture-absorbing and perspiration-wicking mask base pad that can reduce the breathing resistance of the medical mask.

[0127] Comparative Example 1

[0128] The difference between this comparative example and the above-mentioned Example 2 is that in step 1, the aqueous polyurethane emulsion is prepared by the following steps:

[0129] B1: Mix polyethylene glycol, isophorone diisocyanate, 2,2-dimethylolpropionic acid and a catalyst, stir and react at 75-85°C for 4-5 hours, then lower the temperature to 40-50°C, add ethylenediamine until neutral, and prepare a polyurethane prepolymer;

[0130] B2: Deionized water is added to the prepolymer prepared in step B1 and ultrasonically dispersed for 0.3-0.8 h to obtain an aqueous polyurethane emulsion.

[0131] Comparative Example 2

[0132] The difference between this comparative example and the above-mentioned embodiment 2 is that:

[0133] S1: Weaving: Use a three-thread single-jersey knitting machine to weave the face yarn, middle yarn and bottom yarn separately to produce the grey cloth;

[0134] S2: pre-setting treatment of the grey cloth: subjecting the grey cloth obtained in step S1 to a heat setting treatment by heating to obtain a pre-set grey cloth;

[0135] S3: Boiling the cloth: The predetermined shaped cloth obtained in step S2 is pre-treated with a pre-treatment agent and then boiled in hot water at a temperature of 90-100° C. for 25-35 minutes;

[0136] S4: peracidification: adding the grey cloth after the cloth boiling treatment in step S3 into glacial acetic acid and soaking it at a temperature of 15-20°C for 10-20 minutes;

[0137] S5: Scouring: Add the acidified grey cloth obtained in step S4 to hot water at a temperature of 75-85° C. for heat treatment for 8-12 minutes; S6: Shaping treatment: Heat the softened cloth obtained in step S6 and perform heat setting treatment to obtain a moisture-absorbing and perspiration-wicking mask base pad that can reduce the breathing resistance of the medical mask.

[0138] The mask base pads prepared in Example 2 and Comparative Examples 1-2 were tested for moisture absorption and perspiration performance according to GB / T 21655.1-2023. The test items and test results are shown below:

[0139]

[0140]

[0141] It can be seen from the above data that the fabric prepared by the present invention has excellent moisture absorption and perspiration removal function and is soft and comfortable.

[0142] In addition, the Guangzhou Inspection, Testing and Certification Group was commissioned to conduct respiratory resistance-related performance tests on medical masks and the mask base pad prepared in Example 2 according to GB / T 32610-2016 "Technical Specifications for Daily Protective Masks". The test results are as follows:

[0143]

[0144] As shown in the table above, the untreated mask base pad combined with a medical mask reduced inhalation resistance by 3.05 Pa and exhalation resistance by 11.2 Pa compared to a single medical mask. The pretreated mask base pad combined with a three-dimensional mask reduced inhalation resistance by 14.2 Pa and exhalation resistance by 15.4 Pa compared to a single three-dimensional mask. This indicates that using a mask base pad with a medical mask can reduce breathing resistance, alleviate the respiratory burden associated with wearing a medical mask, and improve wearing comfort.

[0145] Among them, the method of using the prepared mask base pad and the matching medical mask is based on Figure 3 As shown, first open the mask base pad and wear it, then check whether the mask base pad covers your mouth and nose, and finally wear a disposable medical surgical mask on the outer surface of the mask base pad.

[0146] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the scope of protection of the present invention.

Claims

1. A moisture-absorbing and perspiration-wicking mask base pad that can reduce the breathing resistance of medical masks, characterized by: The mask base pad is woven from composite yarn, which is woven from a face veil, an intermediate yarn and a bottom yarn in layers. After stacking and forming, the face veil forms a surface layer, the intermediate yarn forms a middle layer, and the bottom yarn forms a bottom layer. The face veil is made of cationic polyester with a fineness of 45-75D and a pore count of 45-75F; the intermediate yarn is made of ultrafine denier polyester with a fineness of 20-50D and a pore count of 45-75F; and the bottom yarn is made of hydrophilic modified polyester with a fineness of 45-75D and a pore count of 45-75F.

2. The moisture-absorbing and perspiration-wicking mask base pad capable of reducing breathing resistance of a medical mask according to claim 1, characterized in that: The cross section of the face yarn is circular; the cross section of the middle yarn is circular; and the cross section of the bottom yarn is cross-shaped.

3. The moisture-absorbing and perspiration-wicking mask base pad capable of reducing breathing resistance of a medical mask according to claim 1, characterized in that: The hydrophilic modified polyester is prepared by the following steps: A1: Dip the polyester into the water-based polyurethane emulsion at 80-100°C for 40-50 minutes; A2: Dry the polyester after padding in step A1 at 115-130°C for 3-8 minutes; A3: The polyester dried in step A2 is subjected to steam treatment at 100-110° C. for 3-8 minutes to obtain a hydrophilic modified polyester.

4. The moisture-absorbing and perspiration-wicking mask base pad capable of reducing breathing resistance of a medical mask according to claim 3, characterized in that: In step 1, the aqueous polyurethane emulsion is prepared by the following steps: B1: Mix polyethylene glycol, isophorone diisocyanate, 2,2-dimethylolpropionic acid and a catalyst, stir and react at 75-85°C for 4-5 hours, then lower the temperature to 40-50°C, add ethylenediamine until neutral, and prepare a polyurethane prepolymer; B2: Add modified sodium alginate, hydroxypropyl-β-cyclodextrin and deionized water to the prepolymer prepared in step B1 and perform ultrasonic dispersion for 0.3-0.8 h to obtain an aqueous polyurethane emulsion.

5. The moisture-absorbing and perspiration-wicking mask base pad capable of reducing breathing resistance of a medical mask according to claim 4, characterized in that: The molar ratio of isophorone diisocyanate, polyethylene glycol and 2,2-dimethylol propionic acid is 2.8-3.2:1:

1.

6. A process for preparing a moisture-absorbing and perspiration-wicking mask base pad capable of reducing breathing resistance of a medical mask as claimed in any one of claims 1 to 5, characterized in that: The steps include: S1: Weaving: Use a three-thread single-jersey knitting machine to weave the face yarn, middle yarn and bottom yarn separately to produce the grey cloth; S2: pre-setting treatment of the grey cloth: performing a heat setting treatment on the grey cloth obtained in step S1 to obtain a pre-set grey cloth; S3: Boiling the cloth: The predetermined shaped cloth obtained in step S2 is pre-treated with a pre-treatment agent and then boiled in hot water at a temperature of 90-100° C. for 25-35 minutes; S4: peracidification: adding the grey cloth after the cloth boiling treatment in step S3 into glacial acetic acid and soaking it at a temperature of 15-20°C for 10-20 minutes; S5: Scouring: adding the acidified grey cloth obtained in step S4 to hot water at a temperature of 75-85°C for heat treatment for 8-12 minutes; S6: Softening: soaking the scour-proof fabric obtained in step S5 in a moisture-absorbing quick-drying agent and a cracking agent to soften the fabric at a temperature of 30-50° C. for 15-25 minutes; S7: Shaping treatment: The softened fabric obtained in step S6 is heated and heat-set to obtain a moisture-absorbing and perspiration-wicking mask base pad that can reduce the breathing resistance of the medical mask.

7. The process for preparing a moisture-absorbing and perspiration-wicking mask base pad capable of reducing breathing resistance of a medical mask according to claim 6, wherein: In step S3, the amount of the pretreatment agent added is 4-6 g / L, wherein the pretreatment agent comprises the following raw materials in parts by weight: 2-4 parts of soap oil, 0.8-1.2 parts of degreasing agent, and 0.8-1.2 parts of sodium carbonate.

8. The process for preparing a moisture-absorbing and perspiration-wicking mask base pad capable of reducing breathing resistance of a medical mask according to claim 6, wherein: In step S4, the amount of glacial acetic acid added is 0.8-1.2 g / L.

9. The process for preparing a moisture-absorbing and perspiration-wicking mask base pad capable of reducing breathing resistance of a medical mask according to claim 6, wherein: In step S6, the mass fraction of the moisture absorbing and quick-drying agent is 3-5%, and the added amount of the cleavage agent is 0.2-0.4 g / L.

10. The process for preparing a moisture-absorbing and perspiration-wicking mask base pad capable of reducing breathing resistance of a medical mask according to claim 6, wherein: In the step S1, the predetermined setting temperature of the heating heat setting treatment is 75-85°C, and the predetermined setting speed is 15-25 m / min; in the step S7, the setting temperature is 110-130°C, and the setting speed is 12-20 m / min.

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