Sweat-absorbing quick-drying labor protection clothing cloth and preparation method thereof

Abstract

The invention relates to the technical field of sweat-absorbing and quick-drying cloth, in particular to sweat-absorbing and quick-drying labor protection clothing cloth and a preparation method thereof. The fabric is prepared from the following raw materials in parts by weight: 50-70 parts of modified ramie fiber, 5-10 parts of spandex, 2-5 parts of a polyether modified organic silicon finishing agent, 0.5-2 parts of a silver ion antibacterial agent, 0.5-2 parts of an alkyl trimethyl ammonium chloride antistatic agent, 0.5-2 parts of an aloe extract softening agent, 10-20 parts of polytetrafluoroethylene resin and 20-40 parts of chinlon 6. Ramie fibers are modified through lipase, sodium hydroxide and acrylic monomers, hydrophilic groups are added to the surfaces of the fibers, meanwhile, microstructures in the fibers become loose, and therefore the hygroscopicity of the fibers is remarkably improved. Teflon resin and chinlon 6 are mixed to form a special microstructure, and a channel is provided for moisture conduction, so that sweat is easier to move towards the surface in the fiber, and the evaporation process of the sweat is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of sweat-absorbing and quick-drying fabrics, in particular to a sweat-absorbing and quick-drying fabric for protective clothing and a preparation method thereof. Background Art

[0002] In many industrial production environments, such as steel mills, glass factories, foundries, etc., workers need to work for a long time in high temperature and high humidity environments. Traditional labor protection clothing often cannot effectively handle sweat, resulting in discomfort for workers. For example, in the steelmaking workshop of a steel plant, the temperature often exceeds 40°C, and workers sweat a lot. If the labor protection clothing cannot quickly absorb and release sweat, the sweat will accumulate in the clothes, which will not only make people feel stuffy and uncomfortable, but may also cause skin problems such as prickly heat and eczema. Take construction workers as an example. When they are carrying construction materials and performing aerial operations, their bodies will continue to sweat. If the clothing has poor sweat absorption and quick-drying properties, sweat will make the clothes stick to the body, affecting work efficiency and increasing health risks such as colds, because when the body stops moving, clothes soaked in sweat will make people feel cold.

[0003] Traditional protective clothing fabrics are mainly made of pure cotton or ordinary chemical fibers. Although pure cotton fabrics have a certain degree of hygroscopicity, they dry slowly when they are full of sweat. In addition, in a humid state, pure cotton fibers will swell, resulting in a decrease in the air permeability of the fabric. Ordinary chemical fiber fabrics usually have poor hygroscopicity, and sweat is difficult to be absorbed. Sweat droplets will form on the skin surface, making people feel sticky. Even in a well-ventilated environment, these traditional fabrics take a long time to dry, which cannot meet the needs of workers to quickly restore a dry and cool wearing experience during work breaks. In view of this, we propose a sweat-absorbing and quick-drying protective clothing fabric and a preparation method thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a sweat-absorbing quick-drying workwear fabric and a preparation method thereof, so as to solve the problem mentioned in the above background technology that traditional fabrics take a long time to dry and cannot meet the needs of workers to quickly restore a dry and cool wearing experience during work breaks.

[0005] To achieve the above object, the present invention provides a sweat-absorbing quick-drying labor protection clothing fabric and a preparation method thereof, comprising the following raw materials: 50-70 parts by weight of modified ramie fiber, 5-10 parts by weight of spandex, 2-5 parts by weight of polyether modified silicone finishing agent, 0.5-2 parts by weight of silver ion antibacterial agent, 0.5-2 parts by weight of alkyl trimethyl ammonium chloride antistatic agent, 0.5-2 parts by weight of aloe extract softener, 10-20 parts by weight of polytetrafluoroethylene resin, and 20-40 parts by weight of nylon 6;

[0006] The modified ramie fiber is prepared by pre-treating the ramie fiber with lipase and sodium hydroxide and then grafting and copolymerizing the ramie fiber with acrylic acid monomer.

[0007] The acrylic acid monomer is any one of acrylic acid, hydroxyethyl methacrylate or methacrylic acid.

[0008] Preferably, the preparation method of the modified ramie fiber is as follows:

[0009] S1.1, weigh the following raw materials in parts by weight respectively: 50-70 parts by weight of ramie fiber, 0.1-1 parts by weight of lipase, 1-5 parts by weight of fatty alcohol polyoxyethylene ether surfactant, 0.5-2 parts by weight of sodium silicate protective agent, 5-15 parts by weight of acrylic acid monomer, and 0.1-0.5 parts by weight of potassium persulfate initiator;

[0010] S1.2, soak the ramie fiber in deionized water for 30-60 minutes to fully moisten it, and then drain the water;

[0011] S1.3, dissolving lipase in a phosphate buffer solution with a pH of 7-8, adding a fatty alcohol polyoxyethylene ether surfactant to obtain a lipase solution with a concentration of 2-5%; placing ramie fiber in the lipase solution, stirring with a stirrer for 2-4 hours;

[0012] Some lipid substances will adhere to the surface of ramie fiber, which will affect the water absorption and other properties of the fiber. Lipase can specifically decompose these lipid impurities to make the fiber surface cleaner. The lipid substances on the fiber surface are usually hydrophobic and will hinder the fiber's absorption of water. After these lipids are removed by lipase, the hydrophilic groups on the fiber surface (such as hydroxyl groups) can better contact with water molecules, thereby improving the fiber's hygroscopicity. The ramie fiber treated with lipase will have a higher regain, and moisture can more easily penetrate from the fiber surface into the fiber and diffuse inside the fiber. This allows the fiber to disperse the sweat more quickly after absorbing sweat, rather than accumulating it locally, creating conditions for subsequent sweat evaporation.

[0013] S1.4, taking out the ramie fiber from the lipase solution, washing it with warm water at 40-50°C to remove the residual lipase, decomposition products and surfactant; washing it with deionized water until the pH value of the washing solution is 6-7, and then drying the ramie fiber at low temperature;

[0014] S1.5, put the ramie fiber treated with lipase into a sodium hydroxide solution with a concentration of 3-8%, add sodium silicate protective agent, and stir for 1-2 hours; after soaking, take out the ramie fiber from the sodium hydroxide solution, rinse with clean water for 15-30 minutes until the pH value of the rinse solution is close to neutral, and then dry at low temperature, the drying temperature is 40-50°C, and the drying time is 2-3 hours;

[0015] Ramie fiber itself is relatively rigid and has a rough feel. Sodium hydroxide will react with some components in the fiber, which can partially destroy the structure of the cellulose crystalline and non-crystalline regions in the fiber, causing changes in the interaction between the molecular chains inside the fiber, causing the fiber to become relatively soft; the cellulose molecules in ramie fiber contain a large number of hydroxyl groups. After being treated with sodium hydroxide, these hydroxyl groups are more likely to form hydrogen bonds with water molecules, thereby increasing the hygroscopicity of the fiber; after being treated with sodium hydroxide, the microstructure inside the fiber becomes looser, which also provides more channels for water molecules to enter the fiber. This structural change enables the fiber to absorb and retain more water, thereby increasing the hygroscopicity of the fiber.

[0016] S1.6. Dissolve the acrylic acid monomer in a sodium bicarbonate solution with a pH of 7-8, add the ramie fiber treated by S1.5 and potassium persulfate initiator, and stir the agitator at 60-70°C and 30-50rpm for 3-5h; after the reaction, take out the ramie fiber, rinse it with warm water at 40-50°C to remove unreacted monomer, initiator and other impurities; dry the ramie fiber at 60-70°C for 1-2h to obtain modified ramie fiber.

[0017] During the graft copolymerization process, acrylic acid monomers will introduce their own hydrophilic groups (such as hydroxyl, carboxyl, amino, etc.) into the molecular chain of ramie fiber. These hydrophilic groups can form hydrogen bonds with water molecules, thereby increasing the fiber's affinity for water. After graft copolymerization, acrylic acid monomers form a hydrophilic coating with lower surface energy on the fiber surface. According to the principle of surface energy, when the fiber surface energy decreases and the hydrophilicity increases, water molecules are more likely to spread and adsorb on the fiber surface. The graft copolymerization of acrylic acid monomers can form more microscopic channels inside the ramie fiber. These channels provide convenient paths for the absorption and conduction of water. On the one hand, the distribution of hydrophilic groups inside the fiber allows water to enter the fiber along the channels formed by these groups. On the other hand, the graft copolymerization process may make the molecular structure of the fiber looser, further expanding the water channels.

[0018] Preferably, in S1.3, the agitator temperature is 30-40°C and the agitator speed is 50-100 rpm.

[0019] Preferably, in S1.4, the low-temperature drying temperature is 40-50°C, and the drying time is 2-3h.

[0020] Preferably, in S1.5, the stirring is performed by a stirrer at a temperature of 25-35° C. and a stirring speed of 20-60 rpm.

[0021] On the other hand, the present invention provides a method for preparing a sweat-absorbing and quick-drying workwear fabric, which is used for any of the above-mentioned sweat-absorbing and quick-drying workwear fabrics, comprising the following steps:

[0022] S2.1. Weigh the following raw materials in parts by weight respectively: 50-70 parts by weight of modified ramie fiber, 5-10 parts by weight of spandex, 2-5 parts by weight of polyether modified silicone finishing agent, 0.5-2 parts by weight of silver ion antibacterial agent, 0.5-2 parts by weight of alkyl trimethyl ammonium chloride antistatic agent, 0.5-2 parts by weight of aloe extract softener, 10-20 parts by weight of polytetrafluoroethylene resin, and 20-40 parts by weight of nylon 6;

[0023] S2.2, mixing the modified ramie fiber and spandex by a fiber mixer to obtain mixed fiber;

[0024] S2.3, respectively dissolving the silver ion antibacterial agent, alkyl trimethyl ammonium chloride antistatic agent, polyether modified silicone finishing agent and aloe extract softener in deionized water to obtain an antibacterial solution, an antistatic solution, a finishing agent solution and a softener solution; soaking the mixed fiber in the antibacterial solution, the antistatic melt, the finishing agent solution and the softener solution in turn, each soaking for 0.5-1h; after each soaking, take out the mixed fiber, rinse it with clean water, and then dry it at a temperature of 50-60°C for 1-2h;

[0025] S2.4, mixing polytetrafluoroethylene resin and nylon 6, adding them into a screw extruder, the temperature of the screw extruder is 240-280°C, the pressure is 5-20MPa, the raw materials are melted and extruded through a spinneret to obtain a composite fiber;

[0026] Due to the high electronegativity of fluorine atoms in its molecular structure, polytetrafluoroethylene resin makes the carbon-fluorine bond (CF) have high stability and low surface energy, thus giving PTFE material excellent hydrophobicity; inside the fiber, due to the mixture of the two materials, a special microstructure is formed, which provides channels for the conduction of moisture; when the sweat from the inner layer is conducted to the outer layer through the inner fabric, these channels can guide the sweat to diffuse inside the fiber; at the same time, the low surface energy of polytetrafluoroethylene makes it easier for sweat to move from the inside of the fiber to the surface, thereby accelerating the evaporation process of sweat.

[0027] S2.5, the mixed fiber in S1.3 and the composite fiber in S1.4 are respectively made into yarn by air-jet spinning, and then made into inner and outer fabrics by air-jet loom;

[0028] S2.6, place the hot melt film between the inner and outer fabrics at a temperature of 180-200℃ and a pressure of 2-3kg / cm 2Under the condition of , the hot-melt material is melted by hot pressing equipment, and the inner and outer layers of fabric are bonded together to obtain sweat-absorbing and quick-drying labor protection clothing fabric.

[0029] Preferably, in S2.2, the rotation speed of the fiber mixer is 400-800 rpm, the mixing time is 15-30 min, and the temperature is 20-30°C.

[0030] Preferably, in S2.4, the aperture of the spinneret is 0.2-0.5 mm, the spinning speed is 1000-3000 m / min, and the stretching ratio is 3-5 times.

[0031] Preferably, in S2.5, the feeding speed of the air-jet spinning is 300-600 m / min, the nozzle pressure is 0.2-0.4 MPa, and the pre-draft ratio is 4-8.

[0032] Preferably, in S2.5, the weaving speed of the air jet loom is 600-900 rpm, the fabric structure is plain weave, the nozzle pressure is 0.3-0.6 MPa, and the beating stroke is 3-8 mm.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. In the sweat-absorbing and quick-drying protective clothing fabric and its preparation method, ramie fiber is modified by lipase, sodium hydroxide and acrylic acid monomer, which significantly improves its moisture absorption performance; during the modification process, the hydrophilic groups (hydroxyl, carboxyl, etc.) on the fiber surface interact with water molecules more effectively, and the internal microstructure of the fiber becomes looser, increasing the water absorption and retention capacity; in addition, the low surface energy hydrophilic coating formed by the acrylic acid monomer on the fiber surface further improves the moisture absorption effect of the fiber.

[0035] 2. In the sweat-absorbing and quick-drying protective clothing fabric and its preparation method, a mixture of polytetrafluoroethylene resin and nylon 6 is used as the outer fabric of the protective clothing. Due to the mixture of the two materials, a special microstructure is formed, which provides channels for the conduction of moisture. When the sweat from the inner layer is conducted to the outer layer through the inner fabric, these channels can guide the sweat to diffuse inside the fiber; at the same time, the low surface energy of polytetrafluoroethylene makes it easier for sweat to move from the inside of the fiber to the surface, thereby accelerating the evaporation process of sweat. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] The invention provides a sweat-absorbing quick-drying labor protection clothing fabric and a preparation method thereof, comprising the following raw materials: 50-70 parts by weight of modified ramie fiber, 5-10 parts by weight of spandex, 2-5 parts by weight of a polyether-modified organic silicon finishing agent, 0.5-2 parts by weight of a silver ion antibacterial agent, 0.5-2 parts by weight of an alkyl trimethyl ammonium chloride antistatic agent, 0.5-2 parts by weight of an aloe extract softener, 10-20 parts by weight of a polytetrafluoroethylene resin, and 20-40 parts by weight of nylon 6;

[0038] The modified ramie fiber is prepared by pre-treating the ramie fiber with lipase and sodium hydroxide and then grafting and copolymerizing the ramie fiber with acrylic acid monomer.

[0039] The acrylic acid monomer is preferably methacrylic acid.

[0040] Embodiment 1: A sweat-absorbing and quick-drying protective clothing fabric and a preparation method thereof, comprising the following steps:

[0041] S2.1. Weigh the following raw materials in parts by weight respectively: 60 parts by weight of modified ramie fiber, 7 parts by weight of spandex, 3 parts by weight of polyether modified silicone finishing agent, 1.5 parts by weight of silver ion antibacterial agent, 1.5 parts by weight of alkyl trimethyl ammonium chloride antistatic agent, 1.5 parts by weight of aloe extract softener, 15 parts by weight of polytetrafluoroethylene resin, and 30 parts by weight of nylon 6;

[0042] S2.2, the modified ramie fiber and spandex are mixed by a fiber mixer at a mixing speed of 600 rpm, a mixing time of 30 min, and a temperature of 30° C. to obtain a mixed fiber;

[0043] S2.3, respectively dissolving the silver ion antibacterial agent, alkyl trimethyl ammonium chloride antistatic agent, polyether modified silicone finishing agent and aloe extract softener in deionized water to obtain an antibacterial solution, an antistatic solution, a finishing agent solution and a softener solution; soaking the mixed fiber in the antibacterial solution, the antistatic melt, the finishing agent solution and the softener solution in turn, each time for 1 hour; after each soaking, take out the mixed fiber, rinse it with clean water, and then dry it at a temperature of 50°C for 2 hours;

[0044] S2.4, polytetrafluoroethylene resin and nylon 6 are mixed and added into a screw extruder, the temperature of the screw extruder is 260°C, the pressure is 15MPa, the raw materials are melted and extruded through a spinneret, the hole diameter of the spinneret is 0.3mm, the spinning speed is 2000m / min, and the stretching ratio is 4 times to obtain a composite fiber;

[0045] S2.5, the mixed fiber in S1.3 and the composite fiber in S1.4 are respectively made into yarn by air-jet spinning, the feeding speed of the air-jet spinning is 400 m / min, the nozzle pressure is 0.3 MPa, and the pre-draft ratio is 6; and then the inner and outer fabrics are made by air-jet loom, the weaving speed of the air-jet loom is 700 rpm, the fabric structure is plain weave, the nozzle pressure is 0.5 MPa, and the beating stroke is 6 mm;

[0046] S2.6, place the hot melt film between the inner and outer fabrics at a temperature of 200°C and a pressure of 3kg / cm 2 Under the condition of , the hot-melt material is melted by hot pressing equipment, and the inner and outer layers of fabric are bonded together to obtain sweat-absorbing and quick-drying labor protection clothing fabric.

[0047] Among them, the specific preparation method of modified ramie fiber is as follows:

[0048] S1.1, weigh the following raw materials in parts by weight respectively: 60 parts by weight of ramie fiber, 0.5 parts by weight of lipase, 3 parts by weight of fatty alcohol polyoxyethylene ether surfactant, 1.5 parts by weight of sodium silicate protective agent, 6 parts by weight of methacrylic acid, and 0.3 parts by weight of potassium persulfate initiator;

[0049] S1.2, soak the ramie fiber in deionized water for 60 minutes to fully moisten it, and then drain the water;

[0050] S1.3, dissolving lipase in a phosphate buffer solution with a pH of 8, adding a fatty alcohol polyoxyethylene ether surfactant to obtain a lipase solution with a concentration of 3%; placing ramie fiber in the lipase solution, stirring with a stirrer at a temperature of 35°C and a stirring speed of 80 rpm, and reacting for 3 hours;

[0051] S1.4, take out the ramie fiber from the lipase solution, rinse it with warm water at 40°C to remove the residual lipase, decomposition products and surfactant; rinse it with deionized water until the pH value of the washing solution is 6, and then dry the ramie fiber at a low temperature of 40°C for 3 hours;

[0052] S1.5, put the ramie fiber treated with lipase into a 3% sodium hydroxide solution, add sodium silicate protective agent, stir with a stirrer, the temperature is 35°C, the stirring speed is 60rpm, and the stirring is carried out for 2h; after the soaking is completed, take out the ramie fiber from the sodium hydroxide solution, rinse with clean water for 30min until the pH value of the rinse liquid is close to neutral, and then dry at low temperature, the drying temperature is 40°C, and the drying time is 3h;

[0053] S1.6. Dissolve methacrylic acid in a sodium bicarbonate solution with a pH of 8, add the ramie fiber treated in S1.5 and potassium persulfate initiator, and stir the agitator at 60°C and 50 rpm for 4 hours; after the reaction, take out the ramie fiber, rinse it with 40°C warm water to remove unreacted methacrylic acid, initiator and other impurities; dry the ramie fiber at 60°C for 2 hours to obtain modified ramie fiber.

[0054] Embodiment 2: A sweat-absorbing and quick-drying protective clothing fabric and a preparation method thereof, comprising the following steps:

[0055] S2.1. Weigh the following raw materials in parts by weight respectively: 60 parts by weight of modified ramie fiber, 7 parts by weight of spandex, 3 parts by weight of polyether modified silicone finishing agent, 1.5 parts by weight of silver ion antibacterial agent, 1.5 parts by weight of alkyl trimethyl ammonium chloride antistatic agent, 1.5 parts by weight of aloe extract softener, 15 parts by weight of polytetrafluoroethylene resin, and 30 parts by weight of nylon 6;

[0056] S2.2, the modified ramie fiber and spandex are mixed by a fiber mixer at a mixing speed of 600 rpm, a mixing time of 30 min, and a temperature of 30° C. to obtain a mixed fiber;

[0057] S2.3, respectively dissolving the silver ion antibacterial agent, alkyl trimethyl ammonium chloride antistatic agent, polyether modified silicone finishing agent and aloe extract softener in deionized water to obtain an antibacterial solution, an antistatic solution, a finishing agent solution and a softener solution; soaking the mixed fiber in the antibacterial solution, the antistatic melt, the finishing agent solution and the softener solution in turn, each time for 1 hour; after each soaking, take out the mixed fiber, rinse it with clean water, and then dry it at a temperature of 50°C for 2 hours;

[0058] S2.4, polytetrafluoroethylene resin and nylon 6 are mixed and added into a screw extruder, the temperature of the screw extruder is 260°C, the pressure is 15MPa, the raw materials are melted and extruded through a spinneret, the hole diameter of the spinneret is 0.3mm, the spinning speed is 2000m / min, and the stretching ratio is 4 times to obtain a composite fiber;

[0059] S2.5, the mixed fiber in S1.3 and the composite fiber in S1.4 are respectively made into yarn by air-jet spinning, the feeding speed of the air-jet spinning is 400 m / min, the nozzle pressure is 0.3 MPa, and the pre-draft ratio is 6; and then the inner and outer fabrics are made by air-jet loom, the weaving speed of the air-jet loom is 700 rpm, the fabric structure is plain weave, the nozzle pressure is 0.5 MPa, and the beating stroke is 6 mm;

[0060] S2.6, place the hot melt film between the inner and outer fabrics at a temperature of 200°C and a pressure of 3kg / cm2 Under the condition of , the hot-melt material is melted by hot pressing equipment, and the inner and outer layers of fabric are bonded together to obtain sweat-absorbing and quick-drying labor protection clothing fabric.

[0061] Among them, the specific preparation method of modified ramie fiber is as follows:

[0062] S1.1, weigh the following raw materials in parts by weight respectively: 60 parts by weight of ramie fiber, 0.5 parts by weight of lipase, 3 parts by weight of fatty alcohol polyoxyethylene ether surfactant, 1.5 parts by weight of sodium silicate protective agent, 9 parts by weight of methacrylic acid, and 0.3 parts by weight of potassium persulfate initiator;

[0063] S1.2, soak the ramie fiber in deionized water for 60 minutes to fully moisten it, and then drain the water;

[0064] S1.3, dissolving lipase in a phosphate buffer solution with a pH of 8, adding a fatty alcohol polyoxyethylene ether surfactant to obtain a lipase solution with a concentration of 3%; placing ramie fiber in the lipase solution, stirring with a stirrer at a temperature of 35°C and a stirring speed of 80 rpm, and reacting for 3 hours;

[0065] S1.4, take out the ramie fiber from the lipase solution, rinse it with warm water at 40°C to remove the residual lipase, decomposition products and surfactant; rinse it with deionized water until the pH value of the washing solution is 6, and then dry the ramie fiber at a low temperature of 40°C for 3 hours;

[0066] S1.5, put the ramie fiber treated with lipase into a 3% sodium hydroxide solution, add sodium silicate protective agent, stir with a stirrer, the temperature is 35°C, the stirring speed is 60rpm, and the stirring is carried out for 2h; after the soaking is completed, take out the ramie fiber from the sodium hydroxide solution, rinse with clean water for 30min until the pH value of the rinse liquid is close to neutral, and then dry at low temperature, the drying temperature is 40°C, and the drying time is 3h;

[0067] S1.6. Dissolve methacrylic acid in a sodium bicarbonate solution with a pH of 8, add the ramie fiber treated in S1.5 and potassium persulfate initiator, and stir the agitator at 60°C and 50 rpm for 4 hours; after the reaction, take out the ramie fiber, rinse it with 40°C warm water to remove unreacted methacrylic acid, initiator and other impurities; dry the ramie fiber at 60°C for 2 hours to obtain modified ramie fiber.

[0068] Embodiment 3: A sweat-absorbing and quick-drying protective clothing fabric and a preparation method thereof, comprising the following steps:

[0069] S2.1. Weigh the following raw materials in parts by weight respectively: 60 parts by weight of modified ramie fiber, 7 parts by weight of spandex, 3 parts by weight of polyether modified silicone finishing agent, 1.5 parts by weight of silver ion antibacterial agent, 1.5 parts by weight of alkyl trimethyl ammonium chloride antistatic agent, 1.5 parts by weight of aloe extract softener, 15 parts by weight of polytetrafluoroethylene resin, and 30 parts by weight of nylon 6;

[0070] S2.2, the modified ramie fiber and spandex are mixed by a fiber mixer at a mixing speed of 600 rpm, a mixing time of 30 min, and a temperature of 30° C. to obtain a mixed fiber;

[0071] S2.3, respectively dissolving the silver ion antibacterial agent, alkyl trimethyl ammonium chloride antistatic agent, polyether modified silicone finishing agent and aloe extract softener in deionized water to obtain an antibacterial solution, an antistatic solution, a finishing agent solution and a softener solution; soaking the mixed fiber in the antibacterial solution, the antistatic melt, the finishing agent solution and the softener solution in turn, each time for 1 hour; after each soaking, take out the mixed fiber, rinse it with clean water, and then dry it at a temperature of 50°C for 2 hours;

[0072] S2.4, polytetrafluoroethylene resin and nylon 6 are mixed and added into a screw extruder, the temperature of the screw extruder is 260°C, the pressure is 15MPa, the raw materials are melted and extruded through a spinneret, the hole diameter of the spinneret is 0.3mm, the spinning speed is 2000m / min, and the stretching ratio is 4 times to obtain a composite fiber;

[0073] S2.5, the mixed fiber in S1.3 and the composite fiber in S1.4 are respectively made into yarn by air-jet spinning, the feeding speed of the air-jet spinning is 400 m / min, the nozzle pressure is 0.3 MPa, and the pre-draft ratio is 6; and then the inner and outer fabrics are made by air-jet loom, the weaving speed of the air-jet loom is 700 rpm, the fabric structure is plain weave, the nozzle pressure is 0.5 MPa, and the beating stroke is 6 mm;

[0074] S2.6, place the hot melt film between the inner and outer fabrics at a temperature of 200°C and a pressure of 3kg / cm 2 Under the condition of , the hot-melt material is melted by hot pressing equipment, and the inner and outer layers of fabric are bonded together to obtain sweat-absorbing and quick-drying labor protection clothing fabric.

[0075] Among them, the specific preparation method of modified ramie fiber is as follows:

[0076] S1.1, weigh the following raw materials in parts by weight respectively: 60 parts by weight of ramie fiber, 0.5 parts by weight of lipase, 3 parts by weight of fatty alcohol polyoxyethylene ether surfactant, 1.5 parts by weight of sodium silicate protective agent, 12 parts by weight of methacrylic acid, and 0.3 parts by weight of potassium persulfate initiator;

[0077] S1.2, soak the ramie fiber in deionized water for 60 minutes to fully moisten it, and then drain the water;

[0078] S1.3, dissolving lipase in a phosphate buffer solution with a pH of 8, adding a fatty alcohol polyoxyethylene ether surfactant to obtain a lipase solution with a concentration of 3%; placing ramie fiber in the lipase solution, stirring with a stirrer at a temperature of 35°C and a stirring speed of 80 rpm, and reacting for 3 hours;

[0079] S1.4, take out the ramie fiber from the lipase solution, rinse it with warm water at 40°C to remove the residual lipase, decomposition products and surfactant; rinse it with deionized water until the pH value of the washing solution is 6, and then dry the ramie fiber at a low temperature of 40°C for 3 hours;

[0080] S1.5, put the ramie fiber treated with lipase into a 3% sodium hydroxide solution, add sodium silicate protective agent, stir with a stirrer, the temperature is 35°C, the stirring speed is 60rpm, and the stirring is carried out for 2h; after the soaking is completed, take out the ramie fiber from the sodium hydroxide solution, rinse with clean water for 30min until the pH value of the rinse liquid is close to neutral, and then dry at low temperature, the drying temperature is 40°C, and the drying time is 3h;

[0081] S1.6. Dissolve methacrylic acid in a sodium bicarbonate solution with a pH of 8, add the ramie fiber treated in S1.5 and potassium persulfate initiator, and stir the agitator at 60°C and 50 rpm for 4 hours; after the reaction, take out the ramie fiber, rinse it with 40°C warm water to remove unreacted methacrylic acid, initiator and other impurities; dry the ramie fiber at 60°C for 2 hours to obtain modified ramie fiber.

[0082] Embodiment 4: A sweat-absorbing and quick-drying protective clothing fabric and a preparation method thereof, comprising the following steps:

[0083] S2.1. Weigh the following raw materials in parts by weight respectively: 60 parts by weight of modified ramie fiber, 7 parts by weight of spandex, 3 parts by weight of polyether modified silicone finishing agent, 1.5 parts by weight of silver ion antibacterial agent, 1.5 parts by weight of alkyl trimethyl ammonium chloride antistatic agent, 1.5 parts by weight of aloe extract softener, 15 parts by weight of polytetrafluoroethylene resin, and 30 parts by weight of nylon 6;

[0084] S2.2, the modified ramie fiber and spandex are mixed by a fiber mixer at a mixing speed of 600 rpm, a mixing time of 30 min, and a temperature of 30° C. to obtain a mixed fiber;

[0085] S2.3, respectively dissolving the silver ion antibacterial agent, alkyl trimethyl ammonium chloride antistatic agent, polyether modified silicone finishing agent and aloe extract softener in deionized water to obtain an antibacterial solution, an antistatic solution, a finishing agent solution and a softener solution; soaking the mixed fiber in the antibacterial solution, the antistatic melt, the finishing agent solution and the softener solution in turn, each time for 1 hour; after each soaking, take out the mixed fiber, rinse it with clean water, and then dry it at a temperature of 50°C for 2 hours;

[0086] S2.4, polytetrafluoroethylene resin and nylon 6 are mixed and added into a screw extruder, the temperature of the screw extruder is 260°C, the pressure is 15MPa, the raw materials are melted and extruded through a spinneret, the hole diameter of the spinneret is 0.3mm, the spinning speed is 2000m / min, and the stretching ratio is 4 times to obtain a composite fiber;

[0087] S2.5, the mixed fiber in S1.3 and the composite fiber in S1.4 are respectively made into yarn by air-jet spinning, the feeding speed of the air-jet spinning is 400 m / min, the nozzle pressure is 0.3 MPa, and the pre-draft ratio is 6; and then the inner and outer fabrics are made by air-jet loom, the weaving speed of the air-jet loom is 700 rpm, the fabric structure is plain weave, the nozzle pressure is 0.5 MPa, and the beating stroke is 6 mm;

[0088] S2.6, place the hot melt film between the inner and outer fabrics at a temperature of 200°C and a pressure of 3kg / cm 2 Under the condition of , the hot-melt material is melted by hot pressing equipment, and the inner and outer layers of fabric are bonded together to obtain sweat-absorbing and quick-drying labor protection clothing fabric.

[0089] Among them, the specific preparation method of modified ramie fiber is as follows:

[0090] S1.1, weigh the following raw materials in parts by weight respectively: 60 parts by weight of ramie fiber, 0.5 parts by weight of lipase, 3 parts by weight of fatty alcohol polyoxyethylene ether surfactant, 1.5 parts by weight of sodium silicate protective agent, 15 parts by weight of methacrylic acid, and 0.3 parts by weight of potassium persulfate initiator;

[0091] S1.2, soak the ramie fiber in deionized water for 60 minutes to fully moisten it, and then drain the water;

[0092] S1.3, dissolving lipase in a phosphate buffer solution with a pH of 8, adding a fatty alcohol polyoxyethylene ether surfactant to obtain a lipase solution with a concentration of 3%; placing ramie fiber in the lipase solution, stirring with a stirrer at a temperature of 35°C and a stirring speed of 80 rpm, and reacting for 3 hours;

[0093] S1.4, take out the ramie fiber from the lipase solution, rinse it with warm water at 40°C to remove the residual lipase, decomposition products and surfactant; rinse it with deionized water until the pH value of the washing solution is 6, and then dry the ramie fiber at a low temperature of 40°C for 3 hours;

[0094] S1.5, put the ramie fiber treated with lipase into a 3% sodium hydroxide solution, add sodium silicate protective agent, stir with a stirrer, the temperature is 35°C, the stirring speed is 60rpm, and the stirring is carried out for 2h; after the soaking is completed, take out the ramie fiber from the sodium hydroxide solution, rinse with clean water for 30min until the pH value of the rinse liquid is close to neutral, and then dry at low temperature, the drying temperature is 40°C, and the drying time is 3h;

[0095] S1.6. Dissolve methacrylic acid in a sodium bicarbonate solution with a pH of 8, add the ramie fiber treated in S1.5 and potassium persulfate initiator, and stir the agitator at 60°C and 50 rpm for 4 hours; after the reaction, take out the ramie fiber, rinse it with 40°C warm water to remove unreacted methacrylic acid, initiator and other impurities; dry the ramie fiber at 60°C for 2 hours to obtain modified ramie fiber.

[0096] Embodiment 5: A sweat-absorbing and quick-drying protective clothing fabric and a preparation method thereof, comprising the following steps:

[0097] S2.1. Weigh the following raw materials in parts by weight respectively: 65 parts by weight of modified ramie fiber, 7 parts by weight of spandex, 3 parts by weight of polyether modified silicone finishing agent, 1.5 parts by weight of silver ion antibacterial agent, 1.5 parts by weight of alkyl trimethyl ammonium chloride antistatic agent, 1.5 parts by weight of aloe extract softener, 15 parts by weight of polytetrafluoroethylene resin, and 30 parts by weight of nylon 6;

[0098] S2.2, the modified ramie fiber and spandex are mixed by a fiber mixer at a mixing speed of 600 rpm, a mixing time of 30 min, and a temperature of 30° C. to obtain a mixed fiber;

[0099] S2.3, respectively dissolving the silver ion antibacterial agent, alkyl trimethyl ammonium chloride antistatic agent, polyether modified silicone finishing agent and aloe extract softener in deionized water to obtain an antibacterial solution, an antistatic solution, a finishing agent solution and a softener solution; soaking the mixed fiber in the antibacterial solution, the antistatic melt, the finishing agent solution and the softener solution in turn, each time for 1 hour; after each soaking, take out the mixed fiber, rinse it with clean water, and then dry it at a temperature of 50°C for 2 hours;

[0100] S2.4, polytetrafluoroethylene resin and nylon 6 are mixed and added into a screw extruder, the temperature of the screw extruder is 260°C, the pressure is 15MPa, the raw materials are melted and extruded through a spinneret, the hole diameter of the spinneret is 0.3mm, the spinning speed is 2000m / min, and the stretching ratio is 4 times to obtain a composite fiber;

[0101] S2.5, the mixed fiber in S1.3 and the composite fiber in S1.4 are respectively made into yarn by air-jet spinning, the feeding speed of the air-jet spinning is 400 m / min, the nozzle pressure is 0.3 MPa, and the pre-draft ratio is 6; and then the inner and outer fabrics are made by air-jet loom, the weaving speed of the air-jet loom is 700 rpm, the fabric structure is plain weave, the nozzle pressure is 0.5 MPa, and the beating stroke is 6 mm;

[0102] S2.6, place the hot melt film between the inner and outer fabrics at a temperature of 200°C and a pressure of 3kg / cm 2 Under the condition of , the hot-melt material is melted by hot pressing equipment, and the inner and outer layers of fabric are bonded together to obtain sweat-absorbing and quick-drying labor protection clothing fabric.

[0103] Among them, the specific preparation method of modified ramie fiber is as follows:

[0104] S1.1, weigh the following raw materials in parts by weight respectively: 60 parts by weight of ramie fiber, 0.5 parts by weight of lipase, 3 parts by weight of fatty alcohol polyoxyethylene ether surfactant, 1.5 parts by weight of sodium silicate protective agent, 12 parts by weight of methacrylic acid, and 0.3 parts by weight of potassium persulfate initiator;

[0105] S1.2, soak the ramie fiber in deionized water for 60 minutes to fully moisten it, and then drain the water;

[0106] S1.3, dissolving lipase in a phosphate buffer solution with a pH of 8, adding a fatty alcohol polyoxyethylene ether surfactant to obtain a lipase solution with a concentration of 3%; placing ramie fiber in the lipase solution, stirring with a stirrer at a temperature of 35°C and a stirring speed of 80 rpm, and reacting for 3 hours;

[0107] S1.4, take out the ramie fiber from the lipase solution, rinse it with warm water at 40°C to remove the residual lipase, decomposition products and surfactant; rinse it with deionized water until the pH value of the washing solution is 6, and then dry the ramie fiber at a low temperature of 40°C for 3 hours;

[0108] S1.5, put the ramie fiber treated with lipase into a 3% sodium hydroxide solution, add sodium silicate protective agent, stir with a stirrer, the temperature is 35°C, the stirring speed is 60rpm, and the stirring is carried out for 2h; after the soaking is completed, take out the ramie fiber from the sodium hydroxide solution, rinse with clean water for 30min until the pH value of the rinse liquid is close to neutral, and then dry at low temperature, the drying temperature is 40°C, and the drying time is 3h;

[0109] S1.6. Dissolve methacrylic acid in a sodium bicarbonate solution with a pH of 8, add the ramie fiber treated in S1.5 and potassium persulfate initiator, and stir the agitator at 60°C and 50 rpm for 4 hours; after the reaction, take out the ramie fiber, rinse it with 40°C warm water to remove unreacted methacrylic acid, initiator and other impurities; dry the ramie fiber at 60°C for 2 hours to obtain modified ramie fiber.

[0110] Embodiment 6: A sweat-absorbing and quick-drying protective clothing fabric and a preparation method thereof, comprising the following steps:

[0111] S2.1. Weigh the following raw materials in parts by weight respectively: 50 parts by weight of modified ramie fiber, 7 parts by weight of spandex, 3 parts by weight of polyether modified silicone finishing agent, 1.5 parts by weight of silver ion antibacterial agent, 1.5 parts by weight of alkyl trimethyl ammonium chloride antistatic agent, 1.5 parts by weight of aloe extract softener, 15 parts by weight of polytetrafluoroethylene resin, and 30 parts by weight of nylon 6;

[0112] S2.2, the modified ramie fiber and spandex are mixed by a fiber mixer at a mixing speed of 600 rpm, a mixing time of 30 min, and a temperature of 30° C. to obtain a mixed fiber;

[0113] S2.3, respectively dissolving the silver ion antibacterial agent, alkyl trimethyl ammonium chloride antistatic agent, polyether modified silicone finishing agent and aloe extract softener in deionized water to obtain an antibacterial solution, an antistatic solution, a finishing agent solution and a softener solution; soaking the mixed fiber in the antibacterial solution, the antistatic melt, the finishing agent solution and the softener solution in turn, each time for 1 hour; after each soaking, take out the mixed fiber, rinse it with clean water, and then dry it at a temperature of 50°C for 2 hours;

[0114] S2.4, polytetrafluoroethylene resin and nylon 6 are mixed and added into a screw extruder, the temperature of the screw extruder is 260°C, the pressure is 15MPa, the raw materials are melted and extruded through a spinneret, the hole diameter of the spinneret is 0.3mm, the spinning speed is 2000m / min, and the stretching ratio is 4 times to obtain a composite fiber;

[0115] S2.5, the mixed fiber in S1.3 and the composite fiber in S1.4 are respectively made into yarn by air-jet spinning, the feeding speed of the air-jet spinning is 400 m / min, the nozzle pressure is 0.3 MPa, and the pre-draft ratio is 6; and then the inner and outer fabrics are made by air-jet loom, the weaving speed of the air-jet loom is 700 rpm, the fabric structure is plain weave, the nozzle pressure is 0.5 MPa, and the beating stroke is 6 mm;

[0116] S2.6, place the hot melt film between the inner and outer fabrics at a temperature of 200°C and a pressure of 3kg / cm 2 Under the condition of , the hot-melt material is melted by hot pressing equipment, and the inner and outer layers of fabric are bonded together to obtain sweat-absorbing and quick-drying labor protection clothing fabric.

[0117] Among them, the specific preparation method of modified ramie fiber is as follows:

[0118] S1.1, weigh the following raw materials in parts by weight respectively: 60 parts by weight of ramie fiber, 0.5 parts by weight of lipase, 3 parts by weight of fatty alcohol polyoxyethylene ether surfactant, 1.5 parts by weight of sodium silicate protective agent, 12 parts by weight of methacrylic acid, and 0.3 parts by weight of potassium persulfate initiator;

[0119] S1.2, soak the ramie fiber in deionized water for 60 minutes to fully moisten it, and then drain the water;

[0120] S1.3, dissolving lipase in a phosphate buffer solution with a pH of 8, adding a fatty alcohol polyoxyethylene ether surfactant to obtain a lipase solution with a concentration of 3%; placing ramie fiber in the lipase solution, stirring with a stirrer at a temperature of 35°C and a stirring speed of 80 rpm, and reacting for 3 hours;

[0121] S1.4, take out the ramie fiber from the lipase solution, rinse it with warm water at 40°C to remove the residual lipase, decomposition products and surfactant; rinse it with deionized water until the pH value of the washing solution is 6, and then dry the ramie fiber at a low temperature of 40°C for 3 hours;

[0122] S1.5, put the ramie fiber treated with lipase into a 3% sodium hydroxide solution, add sodium silicate protective agent, stir with a stirrer, the temperature is 35°C, the stirring speed is 60rpm, and the stirring is carried out for 2h; after the soaking is completed, take out the ramie fiber from the sodium hydroxide solution, rinse with clean water for 30min until the pH value of the rinse liquid is close to neutral, and then dry at low temperature, the drying temperature is 40°C, and the drying time is 3h;

[0123] S1.6. Dissolve methacrylic acid in a sodium bicarbonate solution with a pH of 8, add the ramie fiber treated in S1.5 and potassium persulfate initiator, and stir the agitator at 60°C and 50 rpm for 4 hours; after the reaction, take out the ramie fiber, rinse it with 40°C warm water to remove unreacted methacrylic acid, initiator and other impurities; dry the ramie fiber at 60°C for 2 hours to obtain modified ramie fiber.

[0124] Embodiment 7: A sweat-absorbing and quick-drying protective clothing fabric and a preparation method thereof, comprising the following steps:

[0125] S2.1. Weigh the following raw materials in parts by weight respectively: 65 parts by weight of modified ramie fiber, 5 parts by weight of spandex, 2 parts by weight of polyether modified silicone finishing agent, 0.5 parts by weight of silver ion antibacterial agent, 0.5 parts by weight of alkyl trimethyl ammonium chloride antistatic agent, 0.5 parts by weight of aloe extract softener, 10 parts by weight of polytetrafluoroethylene resin, and 20 parts by weight of nylon 6;

[0126] S2.2, the modified ramie fiber and spandex are mixed by a fiber mixer at a mixing speed of 600 rpm, a mixing time of 30 min, and a temperature of 30° C. to obtain a mixed fiber;

[0127] S2.3, respectively dissolving the silver ion antibacterial agent, alkyl trimethyl ammonium chloride antistatic agent, polyether modified silicone finishing agent and aloe extract softener in deionized water to obtain an antibacterial solution, an antistatic solution, a finishing agent solution and a softener solution; soaking the mixed fiber in the antibacterial solution, the antistatic melt, the finishing agent solution and the softener solution in turn, each time for 1 hour; after each soaking, take out the mixed fiber, rinse it with clean water, and then dry it at a temperature of 50°C for 2 hours;

[0128] S2.4, polytetrafluoroethylene resin and nylon 6 are mixed and added into a screw extruder, the temperature of the screw extruder is 260°C, the pressure is 15MPa, the raw materials are melted and extruded through a spinneret, the hole diameter of the spinneret is 0.3mm, the spinning speed is 2000m / min, and the stretching ratio is 4 times to obtain a composite fiber;

[0129] S2.5, the mixed fiber in S1.3 and the composite fiber in S1.4 are respectively made into yarn by air-jet spinning, the feeding speed of the air-jet spinning is 400 m / min, the nozzle pressure is 0.3 MPa, and the pre-draft ratio is 6; and then the inner and outer fabrics are made by air-jet loom, the weaving speed of the air-jet loom is 700 rpm, the fabric structure is plain weave, the nozzle pressure is 0.5 MPa, and the beating stroke is 6 mm;

[0130] S2.6, place the hot melt film between the inner and outer fabrics at a temperature of 200°C and a pressure of 3kg / cm2 Under the condition of , the hot-melt material is melted by hot pressing equipment, and the inner and outer layers of fabric are bonded together to obtain sweat-absorbing and quick-drying labor protection clothing fabric.

[0131] Among them, the specific preparation method of modified ramie fiber is as follows:

[0132] S1.1, weigh the following raw materials in parts by weight respectively: 60 parts by weight of ramie fiber, 0.5 parts by weight of lipase, 3 parts by weight of fatty alcohol polyoxyethylene ether surfactant, 1.5 parts by weight of sodium silicate protective agent, 12 parts by weight of methacrylic acid, and 0.3 parts by weight of potassium persulfate initiator;

[0133] S1.2, soak the ramie fiber in deionized water for 60 minutes to fully moisten it, and then drain the water;

[0134] S1.3, dissolving lipase in a phosphate buffer solution with a pH of 8, adding a fatty alcohol polyoxyethylene ether surfactant to obtain a lipase solution with a concentration of 3%; placing ramie fiber in the lipase solution, stirring with a stirrer at a temperature of 35°C and a stirring speed of 80 rpm, and reacting for 3 hours;

[0135] S1.4, take out the ramie fiber from the lipase solution, rinse it with warm water at 40°C to remove the residual lipase, decomposition products and surfactant; rinse it with deionized water until the pH value of the washing solution is 6, and then dry the ramie fiber at a low temperature of 40°C for 3 hours;

[0136] S1.5, put the ramie fiber treated with lipase into a 3% sodium hydroxide solution, add sodium silicate protective agent, stir with a stirrer, the temperature is 35°C, the stirring speed is 60rpm, and the stirring is carried out for 2h; after the soaking is completed, take out the ramie fiber from the sodium hydroxide solution, rinse with clean water for 30min until the pH value of the rinse liquid is close to neutral, and then dry at low temperature, the drying temperature is 40°C, and the drying time is 3h;

[0137] S1.6. Dissolve methacrylic acid in a sodium bicarbonate solution with a pH of 8, add the ramie fiber treated in S1.5 and potassium persulfate initiator, and stir the agitator at 60°C and 50 rpm for 4 hours; after the reaction, take out the ramie fiber, rinse it with 40°C warm water to remove unreacted methacrylic acid, initiator and other impurities; dry the ramie fiber at 60°C for 2 hours to obtain modified ramie fiber.

[0138] Comparative Example 1

[0139] The method of Example 5 was adopted, using unmodified ramie fiber.

[0140] Comparative Example 2

[0141] The method of Example 5 was used to remove the acrylic acid monomer.

[0142] Comparative Example 3

[0143] The method of Example 5 was used to remove the lipase.

[0144] The present invention discloses a sweat-absorbing and quick-drying protective clothing fabric prepared by modified ramie fiber and a preparation method thereof, wherein the performance index inspection items and inspection standards of the sweat-absorbing and quick-drying protective clothing fabric are as follows:

[0145] Refer to the national standard GB / T 21655.1-2023 to determine the water absorption rate of the fabric. Take a 10cm×10cm sample, adjust the humidity balance under standard atmosphere, put it into a container filled with third-grade water, take it out after wetting for 5 minutes, hang it vertically and naturally flat, weigh it when it stops dripping, calculate the ratio of the difference between the original mass after wetting to the original mass, and take the average of five samples as the result; fabrics with high water absorption rate can quickly absorb sweat on the skin surface, reduce the feeling of dampness and coldness, keep the skin dry, thereby greatly improving the comfort of the wearer.

[0146] The drying rate of the fabric is determined with reference to the national standard GB / T 21655.1-2023. First, the 10cm×10cm sample is weighed initially. Then, the mass is weighed immediately after dripping water according to the drip diffusion time test method and the fabric is naturally suspended in the standard atmosphere. The mass is weighed every 5 minutes until the difference in mass is no more than 1%. The water evaporation at each moment is calculated according to the formula, and the time-evaporation curve is plotted to obtain the drying rate. Quick-drying fabrics can quickly return to a dry state after absorbing sweat or other liquids, reducing the feeling of dampness and stickiness, making the wearer feel more comfortable.

[0147] According to the above standards, the sweat-absorbing and quick-drying protective clothing fabrics prepared in the above Examples 1-7 and Comparative Examples 1-3 were tested, and the obtained data are shown in Table 1:

[0148] Table 1 Performance data of sweat-absorbing and quick-drying labor protection clothing fabrics of Examples 1-7 and Comparative Examples 1-3

[0149]

[0150] It can be seen from Examples 1-4 that: when the mass ratio of acrylic monomer to ramie fiber in the modified ramie fiber gradually increases, the water absorption rate and drying rate of the protective clothing fabric gradually increase, but when the mass ratio of acrylic monomer to ramie fiber reaches a certain value, the water absorption rate and drying rate of the protective clothing fabric significantly decrease. It can be seen that with the increase of the mass ratio of acrylic monomer, the water absorption rate and drying rate of the protective clothing fabric are improved, but excessive increase may reduce the water absorption rate and drying rate of the protective clothing fabric;

[0151] Specifically, acrylic monomers contain hydrophilic groups (such as carboxyl, hydroxyl, etc.). When they are introduced into the fiber structure of fabrics through reactions such as grafting copolymerization, these hydrophilic groups can form hydrogen bonds with water molecules. As the mass ratio of acrylic monomers increases, the number of hydrophilic groups on the surface and inside of the fibers increases, allowing the fibers to absorb more water molecules, thereby increasing the water absorption rate of the fabric.

[0152] On the one hand, the increase in acrylic acid monomers enhances the hydrophilicity of the fiber, which helps to quickly absorb sweat and prevent sweat from accumulating on the skin surface. On the other hand, the increase in hydrophilic groups inside the fiber can promote the conduction of water. Since good channels are formed between the acrylic acid molecular chains and other fiber components, the absorbed sweat can diffuse faster inside the fiber and migrate to the surface of the fabric, thereby accelerating the evaporation process and increasing the drying rate. In addition, the neutralization degree of acrylic acid directly affects the number of hydrophilic groups on the polymer molecular chain, thereby affecting the water absorption capacity of the polymer. When the neutralization degree is low, the proportion of -COOH on the polymer network chain increases, resulting in a relative decrease in the proportion of -COO Na, and the water absorption rate of the composite material will also decrease.

[0153] Furthermore, by comparing Example 5, Example 6 and Example 7, it can be seen that when other components remain unchanged, only when the proportion of modified ramie fiber gradually increases, the water absorption rate and drying rate of the protective clothing fabric are significantly improved. It can be seen that the ramie fiber grafted with acrylic monomer introduces additional hydrophilic groups, such as carboxyl (-COOH) or amino (-NH2) during the grafting process. These groups, together with the hydroxyl groups of the fiber itself, greatly increase the binding sites between the fiber and the water molecules; at the same time, the modification process will make the internal structure of the fiber looser, providing a more convenient channel for water molecules to enter the fiber, thereby promoting the absorption of water and improving the water absorption rate; due to the good hygroscopicity of the modified ramie fiber, it can quickly absorb sweat from the skin surface. When the sweat is distributed on the fiber surface in the form of a thin liquid film, the evaporation area increases, which accelerates the evaporation of sweat, thereby improving the drying rate.

[0154] By comparing Example 5 with Comparative Example 1, it can be seen that when unmodified ramie fiber is used, the water absorption rate and drying rate of the protective clothing fabric are significantly reduced.

[0155] Taking Example 5 as the best example and combining it with Comparative Example 2, it can be seen that in the preparation method of the modified ramie fiber, when the acrylic acid monomer is removed, the water absorption rate and drying rate of the labor protection clothing fabric are significantly reduced;

[0156] Acrylic acid monomers can significantly improve the water absorption and water conduction capacity of fibers due to their abundant hydrophilic groups. When acrylic acid monomers are grafted onto fibers, the surface tension between the fiber surface and water molecules can be reduced, making it easier for water molecules to spread and penetrate the fiber surface. The modified fibers have high hydrophilicity and can quickly absorb and conduct water, thereby increasing the water absorption rate and drying rate of the fabric. However, once the acrylic acid monomers are removed, the number of hydrophilic groups on the fiber surface is greatly reduced, resulting in a significant decrease in the fiber's adsorption capacity for water molecules, and the water absorption rate of the fabric is reduced accordingly. In addition, the channels formed by acrylic acid monomers inside the fiber help sweat to quickly conduct from one end of the fiber to the other, promoting the diffusion of sweat in the fabric. Without acrylic acid monomers, these water conduction paths are reduced, and the diffusion rate of sweat inside the fiber is slowed down, which affects the drying rate of the fabric.

[0157] Example 5 is the best example, and combined with Comparative Example 3, it can be seen that in the preparation method of modified ramie fiber, when the lipase is removed, the water absorption rate and drying rate of the labor protection clothing fabric are significantly reduced;

[0158] Lipase plays an important role in removing lipid impurities on the surface of ramie fiber during the modification process of ramie fiber; if not treated with lipase, lipid substances will be retained on the surface of ramie fiber. These substances are usually hydrophobic and will form a barrier layer on the fiber surface, reducing the contact opportunity between hydrophilic groups on the fiber surface (such as hydroxyl groups) and water molecules, thereby reducing the water absorption rate; lipase treatment helps to form a good moisture conduction channel inside the fiber, so that moisture can diffuse more effectively inside the fiber and quickly reach the outer layer of the fabric for evaporation; in addition, lipase treatment can also improve the air permeability of the fabric and increase the air circulation required for moisture evaporation, thereby accelerating the evaporation rate of sweat and improving the drying rate.

[0159] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sweat-absorbing and quick-drying labor protection clothing fabric, characterized in that: The invention comprises the following raw materials: 50-70 parts by weight of modified ramie fiber, 5-10 parts by weight of spandex, 2-5 parts by weight of polyether modified silicone finishing agent, 0.5-2 parts by weight of silver ion antibacterial agent, 0.5-2 parts by weight of alkyl trimethyl ammonium chloride antistatic agent, 0.5-2 parts by weight of aloe extract softener, 10-20 parts by weight of polytetrafluoroethylene resin, and 20-40 parts by weight of nylon 6; The modified ramie fiber is prepared by pre-treating the ramie fiber with lipase and sodium hydroxide and then grafting and copolymerizing the ramie fiber with acrylic acid monomer. The acrylic acid monomer is any one of acrylic acid, hydroxyethyl methacrylate or methacrylic acid.

2. The sweat-drying protective clothing fabric according to claim 1, characterized in that: The preparation method of the modified ramie fiber is as follows: S1.1, weigh the following raw materials in parts by weight respectively: 50-70 parts by weight of ramie fiber, 0.1-1 parts by weight of lipase, 1-5 parts by weight of fatty alcohol polyoxyethylene ether surfactant, 0.5-2 parts by weight of sodium silicate protective agent, 5-15 parts by weight of acrylic acid monomer, and 0.1-0.5 parts by weight of potassium persulfate initiator; S1.2, soak the ramie fiber in deionized water for 30-60 minutes to fully moisten it, and then drain the water; S1.3, dissolving lipase in a phosphate buffer solution with a pH of 7-8, adding a fatty alcohol polyoxyethylene ether surfactant to obtain a lipase solution with a concentration of 2-5%; placing ramie fiber in the lipase solution, stirring with a stirrer for 2-4 hours; S1.4, taking out the ramie fiber from the lipase solution, washing it with warm water at 40-50°C to remove the residual lipase, decomposition products and surfactant; washing it with deionized water until the pH value of the washing solution is 6-7, and then drying the ramie fiber at low temperature; S1.5, placing the ramie fiber treated with lipase into a 3-8% sodium hydroxide solution, adding sodium silicate protective agent, and stirring for 1-2 hours; After soaking, take the ramie fiber out of the sodium hydroxide solution, rinse it with clean water for 15-30 minutes until the pH value of the rinse solution is close to neutral, and then dry it at low temperature, with the drying temperature being 40-50°C and the drying time being 2-3 hours; S1.

6. Dissolve the acrylic acid monomer in a sodium bicarbonate solution with a pH of 7-8, add the ramie fiber treated by S1.5 and potassium persulfate initiator, and stir the agitator at 60-70°C and 30-50rpm for 3-5h; after the reaction, take out the ramie fiber, rinse it with warm water at 40-50°C to remove unreacted monomer, initiator and other impurities; dry the ramie fiber at 60-70°C for 1-2h to obtain modified ramie fiber.

3. The sweat-absorbing and quick-drying protective clothing fabric according to claim 2, characterized in that: In the S1.3, the stirrer temperature is 30-40°C and the stirring speed is 50-100 rpm.

4. The sweat-absorbing and quick-drying protective clothing fabric according to claim 2, characterized in that: In S1.4, the low-temperature drying temperature is 40-50° C., and the drying time is 2-3 hours.

5. The sweat-absorbing and quick-drying protective clothing fabric according to claim 2, characterized in that: In the S1.5, stirring is performed by a stirrer at a temperature of 25-35° C. and a stirring speed of 20-60 rpm.

6. A method for preparing a sweat-absorbing and quick-drying workwear fabric, used for preparing a sweat-absorbing and quick-drying workwear fabric as claimed in any one of claims 1 to 5, characterized in that: The preparation method of the sweat-absorbing and quick-drying labor protection clothing fabric is as follows; S2.

1. Weigh the following raw materials in parts by weight respectively: 50-70 parts by weight of modified ramie fiber, 5-10 parts by weight of spandex, 2-5 parts by weight of polyether modified silicone finishing agent, 0.5-2 parts by weight of silver ion antibacterial agent, 0.5-2 parts by weight of alkyl trimethyl ammonium chloride antistatic agent, 0.5-2 parts by weight of aloe extract softener, 10-20 parts by weight of polytetrafluoroethylene resin, and 20-40 parts by weight of nylon 6; S2.2, mixing the modified ramie fiber and spandex by a fiber mixer to obtain mixed fiber; S2.3, respectively dissolving the silver ion antibacterial agent, alkyl trimethyl ammonium chloride antistatic agent, polyether modified silicone finishing agent and aloe extract softener in deionized water to obtain an antibacterial solution, an antistatic solution, a finishing agent solution and a softener solution; soaking the mixed fiber in the antibacterial solution, the antistatic melt, the finishing agent solution and the softener solution in turn, each soaking for 0.5-1h; after each soaking, take out the mixed fiber, rinse it with clean water, and then dry it at a temperature of 50-60°C for 1-2h; S2.4, mixing polytetrafluoroethylene resin and nylon 6, adding them into a screw extruder, the temperature of the screw extruder is 240-280°C, the pressure is 5-20MPa, the raw materials are melted and extruded through a spinneret to obtain a composite fiber; S2.5, the mixed fiber in S1.3 and the composite fiber in S1.4 are respectively made into yarn by air-jet spinning, and then made into inner and outer fabrics by air-jet loom; S2.6, place the hot melt film between the inner and outer fabrics at a temperature of 180-200℃ and a pressure of 2-3kg / cm 2 Under the condition of , the hot-melt material is melted by hot pressing equipment, and the inner and outer layers of fabric are bonded together to obtain sweat-absorbing and quick-drying labor protection clothing fabric.

7. The method for preparing the sweat-absorbing quick-drying protective clothing fabric according to claim 6, characterized in that: In S2.2, the rotation speed of the fiber mixer is 400-800 rpm, the mixing time is 15-30 min, and the temperature is 20-30°C.

8. The method for preparing the sweat-absorbing and quick-drying protective clothing fabric according to claim 6, characterized in that: In the S2.4, the aperture of the spinneret is 0.2-0.5 mm, the spinning speed is 1000-3000 m / min, and the stretching ratio is 3-5 times.

9. The method for preparing the sweat-absorbing and quick-drying protective clothing fabric according to claim 6, characterized in that: In the S2.5, the feed speed of the air-jet spinning is 300-600 m / min, the nozzle pressure is 0.2-0.4 MPa, and the pre-draft ratio is 4-8.

10. The method for preparing the sweat-absorbing quick-drying protective clothing fabric according to claim 6, characterized in that: In the S2.5, the weaving speed of the air jet loom is 600-900 rpm, the fabric structure is plain weave, the nozzle pressure is 0.3-0.6 MPa, and the beating stroke is 3-8 mm.

Images