A kind of moisture-absorbing and antibacterial fabric for knitted clothing and preparation method thereof

Abstract

The present invention provides a hygroscopic antibacterial fabric for knitted clothing and a preparation method thereof. The hygroscopic antibacterial fabric is prepared by blending the following fibers: spandex fiber, 20%-30%; polyester fiber, 70%-80%; wherein the spandex fiber includes hygroscopic antibacterial plant fiber, and the hygroscopic antibacterial plant fiber is prepared by using raw materials including bamboo fiber powder, and undergoing calcium carbonate wet chemical coating deposition surface treatment and antibacterial agent coating modification treatment. The hygroscopic antibacterial fabric for knitted clothing obtained by the preparation method of the present invention has the advantages of good hygroscopicity and antibacterial properties.

Description

Technical Field

[0001] The invention relates to the technical field of textile materials, and in particular to a moisture-absorbing and antibacterial fabric for knitted clothing and a preparation method thereof. Background Art

[0002] There are many kinds of fabrics that can be used for knitted clothing. These fabrics have their own unique characteristics and advantages according to the different materials, weaving methods and uses. For example, knitted clothing mainly includes natural fiber knitted fabrics, synthetic fiber knitted fabrics, and blended knitted fabrics.

[0003] For example, natural fiber knitted fabrics such as cotton, wool, and silk have good moisture absorption and breathability. Synthetic fiber knitted fabrics such as polyester and nylon have good elasticity, wear resistance, and wrinkle resistance. Blended knitted fabrics are knitted by mixing natural fibers with synthetic fibers, combining the advantages of both. For example, cotton-polyester knitted fabrics maintain the comfort and breathability of cotton while enhancing the wrinkle resistance and wear resistance of the fabric. Wool-polyester knitted fabrics combine the warmth of wool with the elasticity of polyester, making them suitable for making winter coats and other clothing.

[0004] Synthetic fiber knitted fabrics and blended knitted fabrics have gradually become the mainstream of the clothing industry because of their low price and comfort. However, one of the technical problems they face is that the moisture absorption performance of synthetic fiber knitted fabrics and blended knitted fabrics is usually poor. In addition, consumers are gradually making higher and higher requirements for clothing fabrics. With the development of the times and the improvement of people's living conditions, people's requirements for clothing are no longer just satisfied with functions such as warmth and beauty, but also require clothing to have more additional functions, such as antibacterial and deodorizing, anti-ultraviolet, water and oil repellent, medical and health care, etc.

[0005] Among them, how to improve the moisture absorption and antibacterial properties of clothing fabrics are two important technical problems that technicians in this field are committed to solving. Summary of the invention

[0006] One of the problems solved by the present invention is how to provide a fabric with good moisture absorption and antibacterial effects for knitted clothing.

[0007] In order to solve at least one of the above problems, the present invention provides a method for preparing a hygroscopic and antibacterial fabric for knitted clothing. The hygroscopic and antibacterial fabric is made of the following fibers and is blended: spandex fiber, 20%-30%; polyester fiber, 70%-80%; wherein the spandex fiber includes hygroscopic and antibacterial plant fiber, and the hygroscopic and antibacterial plant fiber is made of raw materials including bamboo fiber powder, and is prepared through calcium carbonate wet chemical coating deposition surface treatment and antibacterial agent coating modification treatment.

[0008] In any of the above technical solutions, the preparation method comprises:

[0009] S100, preparing hygroscopic and antibacterial plant fibers;

[0010] S200, preparing spandex fiber by melt spinning using raw materials including polyurethane elastomer and hygroscopic antibacterial plant fiber;

[0011] S300, preparing polyester fiber by melt spinning using raw materials including polyethylene terephthalate and polytetrafluoroethylene;

[0012] S400, spandex fiber and polyester fiber are spun into synthetic silk thread, and the synthetic silk thread is used to weave a moisture-absorbing and antibacterial fabric.

[0013] In any of the above technical solutions, the hygroscopic antibacterial plant fiber is prepared by the following steps:

[0014] S111, mixing zinc chloride and calcium chloride in water to obtain a first solution;

[0015] S112, uniformly mixing lauryltrimethylammonium chloride and sodium carbonate in water to prepare a second solution;

[0016] S113, heating the first solution to 50° C. to 55° C., adding the bamboo fiber powder to the first solution, and stirring the mixture at the temperature for 20 to 30 minutes to obtain a first mixture;

[0017] S114, after the stirring is completed, the second solution is added dropwise into the first mixture while stirring simultaneously, after the addition is completed, the mixture is allowed to stand for 1 to 2 hours, and filtered to obtain a first solid;

[0018] S115, uniformly mixing 3,5-di(trimellitic anhydride ester)benzoylbenzisothiazolinone, the first solid and N-methylpyrrolidone to obtain a second mixture;

[0019] S116, mixing hydrogenated castor oil, lauryl phosphate, γ-aminopropyltriethoxysilane, 1,2-bis(2-aminoethoxy)ethane, and N-methylpyrrolidone by ultrasonication, and then adding castor oil and water and continuing to mix by ultrasonication to obtain a third mixture;

[0020] S117. Gradually add the third mixture into the second mixture and stir simultaneously. After the addition is completed, heat to 38° C. to 40° C. and continue stirring for 6 h to 8 h. Filter, wash and dry to obtain hygroscopic antibacterial plant fiber.

[0021] In any of the above technical solutions, in S111, the mass ratio of zinc chloride:calcium chloride:water=(4-6):(10-20):100.

[0022] In any of the above technical solutions, in S112, the mass ratio of lauryltrimethylammonium chloride:sodium carbonate:water=(1-2):(10-15):100.

[0023] In any of the above technical solutions, in S113, the mass ratio of bamboo fiber powder to first solution is (10-20):100.

[0024] In any of the above technical solutions, in S114, the volume ratio of the first solution: the second solution = (80-120):100.

[0025] In any of the above technical solutions, in S115, the mass ratio of 3,5-di(trimellitic anhydride ester)benzoylbenzisothiazolinone:first solid:N-methylpyrrolidone=(10-20):(30-40):100.

[0026] In any of the above technical solutions, in S116, the mass ratio of hydrogenated castor oil: lauryl phosphate: γ-aminopropyltriethoxysilane: 1,2-bis(2-aminoethoxy)ethane: N-methylpyrrolidone: castor oil: water = (1-2): (2-4): (3-6): (10-20): (30-40): (30-40): 100.

[0027] In any of the above technical solutions, in S117, the mass ratio of the second mixture to the third mixture is (80-120):100.

[0028] In any of the above technical solutions, S200 specifically includes:

[0029] S211, stirring and kneading the maleic anhydride grafted POE, the hygroscopic antibacterial plant fiber and the polyurethane elastomer to obtain a composite polyurethane elastomer;

[0030] S212, melt-spinning the composite polyurethane elastomer at a temperature of 175° C. to 185° C. to obtain spandex fibers.

[0031] In any of the above technical solutions, in S211, the mass ratio of maleic anhydride grafted POE: hygroscopic antibacterial plant fiber: polyurethane elastomer = (15-20): (30-40): 100.

[0032] In any of the above technical solutions, S300 specifically includes:

[0033] S311, mixing sodium dodecylbenzene sulfonate, polytetrafluoroethylene after hydrophilic modification and polyethylene terephthalate in a mass ratio of sodium dodecylbenzene sulfonate:polytetrafluoroethylene:polyethylene terephthalate=(2-4):(4-6):100, extruding and granulating to obtain a masterbatch;

[0034] S312, melt-spinning the dried masterbatch at a temperature of 250° C. to 300° C. to prepare polyester fibers.

[0035] In any of the above technical solutions, the hydrophilic modification treatment includes:

[0036] S310. Polyethylene glycol, water and polytetrafluoroethylene are uniformly mixed in a mass ratio of polyethylene glycol: water: polytetrafluoroethylene = (15-20): (15-20): 100, and the mixture is introduced into a plasma generator for plasma treatment at a power of 200 W to 220 W for 10 min to 15 min. After the treatment, the mixture is washed with water and dried to obtain hydrophilically modified polytetrafluoroethylene.

[0037] The present invention also provides a hygroscopic and antibacterial fabric for knitted clothing. The hygroscopic and antibacterial fabric for knitted clothing is obtained by using the preparation method of any of the above technical solutions.

[0038] Beneficial Effects

[0039] The moisture-absorbing and antibacterial fabric provided by the present invention is made by blending spandex fiber and polyester fiber. Polyester fiber, also known as polyester fiber, is made by chemical polycondensation of organic dibasic acid and diol. Polyester fiber has excellent wrinkle resistance and shape retention, and the clothes made from it are not easy to wrinkle during wearing, and can maintain the original shape of the clothes. In addition, polyester fiber also has the advantages of wear resistance and non-sticky hair. Spandex fiber, also known as polyurethane elastic fiber, has excellent elasticity. Synthetic fiber composited with polyester fiber and spandex fiber is an ideal material for making sports and leisure clothing. However, the hygroscopic performance of synthetic fiber knitted fabric composited with polyester fiber and spandex fiber is poor. In order to improve the hygroscopic performance of the fabric, plant fiber is added to the spandex fiber in the present invention. For example, natural plant fibers such as bamboo fiber, wood fiber, and cotton fiber can improve the hygroscopic and sweat-absorbing performance of synthetic fibers and improve their wearing comfort. The plant fiber of the present invention is a hygroscopic antibacterial plant fiber, which is prepared by using raw materials including bamboo fiber powder, and undergoing calcium carbonate wet chemical coating deposition surface treatment and antibacterial agent coating modification treatment. Among various plant fibers, bamboo fiber itself has good elasticity, and the biological structure of bamboo fiber causes its fiber to produce a capillary effect, so that bamboo fiber has better hygroscopic properties. Considering that bamboo fiber, as a natural plant fiber, has poor antibacterial and mildew-proof properties, the present invention performs a modification treatment on bamboo fiber powder, thereby preparing a polyester fiber and spandex fiber composite fabric with good hygroscopic and antibacterial properties. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the following is a detailed description of the specific embodiments of the present invention.

[0041] Unless otherwise specified, the reagents and raw materials used in the present invention can be purchased through commercial channels. The experimental methods in the following examples without specifying specific conditions are selected according to conventional methods and conditions, or according to the product specifications.

[0042] The present invention provides a method for preparing a hygroscopic antibacterial fabric for knitted clothing. The hygroscopic antibacterial fabric is prepared by blending the following fibers: spandex fiber, 20%-30%; polyester fiber, 70%-80%. Since the hygroscopic antibacterial fabric of the present invention is blended by synthetic fibers of polyester fiber and spandex fiber, it has good elasticity, soft texture, no wrinkles, and wear resistance.

[0043] However, the hygroscopic performance of synthetic fiber knitted fabrics composited with polyester fiber and spandex fiber is poor. In order to improve the hygroscopic performance of the fabric, the present invention adds plant fiber to the spandex fiber. Specifically, the present invention adds bamboo fiber to the spandex fiber. Bamboo fiber itself has good elasticity, and the biological structure of bamboo fiber causes its fiber to produce a capillary effect, so that bamboo fiber has better hygroscopic performance.

[0044] Considering that bamboo fiber, as a natural plant fiber, has poor antibacterial and mildew-proof properties, the present invention performs antibacterial agent coating and modification treatment on bamboo fiber powder, thereby preparing a polyester fiber and spandex fiber composite fabric with good moisture absorption and antibacterial properties.

[0045] In addition, considering that the strength of bamboo fiber is relatively low and it is difficult to withstand large tensile forces, its tensile and wear resistance are not compatible with those of artificial fibers. In addition, bamboo fiber has poor tolerance to acidic substances. The bamboo fiber powder used in the present invention is treated with calcium carbonate wet chemical coating deposition surface treatment, thereby improving its mechanical strength, especially wear resistance.

[0046] Before introducing the bamboo fiber modification method adopted by the present invention, the overall preparation process of the hygroscopic and antibacterial fabric of the present invention is first introduced. The preparation method of the hygroscopic and antibacterial fabric for knitted clothing of the present invention comprises:

[0047] S100, preparing hygroscopic and antibacterial plant fibers;

[0048] S200, preparing spandex fiber by melt spinning using raw materials including polyurethane elastomer and hygroscopic antibacterial plant fiber;

[0049] S300, preparing polyester fiber by melt spinning using raw materials including polyethylene terephthalate and polytetrafluoroethylene;

[0050] S400, spandex fiber and polyester fiber are spun into synthetic silk thread, and the synthetic silk thread is used to weave a moisture-absorbing and antibacterial fabric.

[0051] In the above steps, the hygroscopic antibacterial plant fiber is treated bamboo fiber. Both spandex fiber and polyester fiber are obtained through a melt spinning process. After obtaining the two fibers respectively, the spandex fiber and polyester fiber are spun into synthetic yarn, and then the warp and weft are woven to obtain a hygroscopic antibacterial fabric.

[0052] It should be noted that the melt spinning preparation process of spandex fiber and polyester fiber, as well as the spinning and weaving process of synthetic yarn are relatively mature existing technologies. Those skilled in the art are capable of selecting appropriate process steps and process parameters according to actual needs to achieve the preparation and weaving of the above fibers. Below, the present invention briefly introduces the above process.

[0053] For spandex fiber, it is necessary to select polyurethane elastomer (TPU) with stable quality and uniform molecular weight distribution as raw material. First, the polyurethane elastomer is dried to remove moisture and impurities therein; then the polyurethane elastomer and bamboo fiber as hygroscopic and antibacterial plant fiber are screened or crushed respectively to ensure that their particle size is uniform, which is conducive to melting and spinning; then the pretreated polyurethane elastomer and bamboo fiber are sent to a screw extruder for melting (the melting temperature range is generally 160°C to 200°C); thereafter, the molten polyurethane elastomer raw material is quantitatively and uniformly pressed to the spinning assembly through a spinning pump, and the molten stream is squeezed out from the small holes of the spinneret (the parameters of the spinneret such as the aperture, number of holes, and hole spacing can be selected by technicians in this field) to form a fiber stream; finally, the spun fiber stream quickly enters a cooling device, and the fiber gradually solidifies during the cooling process. After the fiber is stretched and shaped, spandex fiber can be obtained.

[0054] Exemplarily, S200 of the present invention specifically includes:

[0055] S211, stirring and kneading the maleic anhydride grafted POE, the hygroscopic antibacterial plant fiber and the polyurethane elastomer in a mass ratio of maleic anhydride grafted POE: hygroscopic antibacterial plant fiber: polyurethane elastomer = (15-20): (30-40): 100 to obtain a composite polyurethane elastomer;

[0056] S212, melt-spinning the composite polyurethane elastomer at a temperature of 175° C. to 185° C. to obtain spandex fibers.

[0057] Among them, maleic anhydride grafted POE is a chemical substance that grafts maleic anhydride onto the POE (polyolefin elastomer) molecular chain through a chemical reaction. Polyolefin elastomer itself is an in-situ polymerized thermoplastic elastomer of ethylene and octene, which has excellent toughness and good processability. At the same time, there are no unsaturated double bonds in its molecular structure, which gives it excellent aging resistance. The introduction of maleic anhydride further enhances the functionality of polyolefin elastomers. Adding maleic anhydride grafted POE to polyurethane elastomers can improve the interfacial adhesion between polar materials and non-polar materials, promote their compatibility, improve the toughness of the fiber, and reduce its processing difficulty.

[0058] The melt spinning process of polyester fiber is similar to that of spandex fiber. Polyethylene terephthalate (PET) is prepared by dehydration polycondensation reaction and high temperature and high pressure polymerization reaction of terephthalic acid (PTA) and ethylene glycol (EG) under the action of small molecule chain transfer agents and other additives. The melt spinning process of polyester fiber also requires the polyethylene terephthalate particles to be dried to remove moisture and impurities; then it is sent to the melt spinning equipment to melt into a melt at high temperature (the melting temperature range is generally 250℃ to 350℃); finally, the melt is extruded into filaments through a spinneret, and quickly cooled and solidified into fibers in a cooling device, and then stretched and shaped.

[0059] After spandex fibers and polyester fibers are obtained separately, spandex and polyester fiber strips or fiber bundles are mixed together in proportion, twisted and drawn through a spinning machine to form blended yarns, and then the blended yarns are used for weaving to form fabrics with the desired structure and performance. The fabrics can then be post-processed such as shaping and dyeing as needed.

[0060] Exemplarily, S300 specifically includes:

[0061] S311, mixing sodium dodecylbenzene sulfonate, polytetrafluoroethylene after hydrophilic modification and polyethylene terephthalate in a mass ratio of sodium dodecylbenzene sulfonate:polytetrafluoroethylene:polyethylene terephthalate=(2-4):(4-6):100, extruding and granulating to obtain a masterbatch;

[0062] S312, melt-spinning the dried masterbatch at a temperature of 250° C. to 300° C. to prepare polyester fibers.

[0063] The above steps add polytetrafluoroethylene to the melt spinning process of polyethylene terephthalate. Adding polytetrafluoroethylene to the process of preparing polyester fiber by melt spinning process of polyethylene terephthalate can significantly improve the wear resistance, corrosion resistance and self-cleaning ability of the fiber.

[0064] Polytetrafluoroethylene is characterized by corrosion resistance and low friction coefficient. Melt spinning it with polyethylene terephthalate can improve the wearing experience of polyester fiber and the comfort of fabric. However, polytetrafluoroethylene has poor compatibility with other polymer materials and is easy to agglomerate in the system. Therefore, the present invention chooses to perform hydrophilic modification on polytetrafluoroethylene, and the specific treatment method is:

[0065] S310. Polyethylene glycol, water and polytetrafluoroethylene are uniformly mixed in a mass ratio of polyethylene glycol: water: polytetrafluoroethylene = (15-20): (15-20): 100, and the mixture is introduced into a plasma generator for plasma treatment at a power of 200 W to 220 W for 10 min to 15 min. After the treatment, the mixture is washed with water and dried to obtain hydrophilically modified polytetrafluoroethylene.

[0066] Preferably, polyethylene glycol: water: polytetrafluoroethylene = 15: 20: 100. By adopting the above technical solution, polyethylene glycol can be introduced and branched on the surface of polytetrafluoroethylene by plasma treatment. Hydrophilic polyethylene glycol can effectively improve the surface properties of polytetrafluoroethylene, enhance the compatibility and bonding strength between tetrafluoroethylene and polyethylene terephthalate, and improve the moisture absorption effect of polyester fiber.

[0067] After introducing the overall textile process, the bamboo fiber processing process of the present invention will be introduced below. The moisture-absorbing and antibacterial plant fiber of the present invention is prepared by the following steps:

[0068] S111, mixing zinc chloride and calcium chloride in water in a mass ratio of zinc chloride:calcium chloride:water=(4-6):(10-20):100 to prepare a first solution;

[0069] S112, lauryl trimethyl ammonium chloride and sodium carbonate are uniformly mixed in water according to a mass ratio of lauryl trimethyl ammonium chloride: sodium carbonate: water = (1-2): (10-15): 100 to prepare a second solution;

[0070] S113, heating the first solution to 50° C. to 55° C. at a mass ratio of bamboo fiber powder to first solution = (10-20): 100, adding the bamboo fiber powder to the first solution, and stirring at the temperature for 20 to 30 minutes to obtain a first mixture;

[0071] S114, according to the volume ratio of the first solution: the second solution = (80-120): 100, after the stirring is completed, the second solution is added dropwise into the first mixture while stirring simultaneously, after the dropwise addition is completed, the mixture is allowed to stand for 1 to 2 hours, and a first solid is obtained by filtering;

[0072] S115, 3,5-di(trimellitic anhydride ester)benzoylbenzisothiazolinone, the first solid and N-methylpyrrolidone are uniformly mixed in a mass ratio of 3,5-di(trimellitic anhydride ester)benzoylbenzisothiazolinone:first solid:N-methylpyrrolidone=(10-20):(30-40):100 to prepare a second mixture;

[0073] S116, ultrasonically mixing hydrogenated castor oil, lauryl phosphate, γ-aminopropyl triethoxysilane, 1,2-bis(2-aminoethoxy)ethane, and N-methylpyrrolidone in a mass ratio of hydrogenated castor oil: lauryl phosphate: γ-aminopropyl triethoxysilane: 1,2-bis(2-aminoethoxy)ethane: N-methylpyrrolidone: castor oil: water = (1-2): (2-4): (3-6): (10-20): (30-40): (30-40): 100, then adding castor oil and water and continuing to ultrasonically mix to obtain a third mixture;

[0074] S117. According to the mass ratio of the second mixture: the third mixture = (80-120): 100, gradually add the third mixture into the second mixture and stir simultaneously. After the addition is completed, heat to 38°C to 40°C and continue stirring for 6h to 8h. Filter, wash and dry to obtain hygroscopic antibacterial plant fiber.

[0075] Preferably, the hygroscopic and antibacterial plant fiber of the present invention is prepared by the following steps:

[0076] S111, mixing zinc chloride and calcium chloride in water in a mass ratio of zinc chloride:calcium chloride:water=5:15:100 to prepare a first solution;

[0077] S112, mixing lauryl trimethyl ammonium chloride and sodium carbonate in water at a mass ratio of lauryl trimethyl ammonium chloride: sodium carbonate: water = 1:15:100 to prepare a second solution;

[0078] S113, heating the first solution to 50° C. to 55° C. at a mass ratio of bamboo fiber powder to first solution = 15:100, adding the bamboo fiber powder to the first solution, and stirring at the temperature for 20 min to 30 min to obtain a first mixture;

[0079] S114, according to the volume ratio of the first solution: the second solution = 100:100, after the stirring is completed, the second solution is added dropwise into the first mixture and stirred simultaneously, after the dropwise addition is completed, it is allowed to stand for 1 hour to 2 hours, and filtered to obtain a first solid;

[0080] S115, 3,5-di(trimellitic anhydride ester)benzoylbenzisothiazolinone, the first solid and N-methylpyrrolidone are uniformly mixed in a mass ratio of 3,5-di(trimellitic anhydride ester)benzoylbenzisothiazolinone: the first solid: N-methylpyrrolidone = 15:35:100 to prepare a second mixture;

[0081] S116. Ultrasonically mix hydrogenated castor oil, lauryl phosphate, γ-aminopropyl triethoxysilane, 1,2-bis(2-aminoethoxy)ethane, and N-methylpyrrolidone in a mass ratio of hydrogenated castor oil: lauryl phosphate: γ-aminopropyl triethoxysilane: 1,2-bis(2-aminoethoxy)ethane: N-methylpyrrolidone: castor oil: water = 1:2:4:15:35:35:100, then add castor oil and water and continue ultrasonically mixing to obtain a third mixture;

[0082] S117. Gradually add the third mixture into the second mixture and stir simultaneously at a mass ratio of the second mixture: the third mixture = 100:100. After the addition is completed, heat to 38° C. to 40° C. and continue stirring for 6 h to 8 h. Filter, wash and dry to obtain hygroscopic antibacterial plant fiber.

[0083] The purpose of adopting the above S111 to S117 is to modify the bamboo fiber. First, the surface of the bamboo fiber contains a large number of extremely hydrophilic functional groups, which have poor interface compatibility with the non-polar resin matrix and are not tightly combined with the polyurethane elastomer. In addition, the tensile and wear resistance of the bamboo fiber are not ideal. For this reason, the present invention uses calcium carbonate to coat and modify the bamboo fiber.

[0084] Zinc chloride and calcium chloride, as soluble metal chlorides, can be prepared into an aqueous solution (i.e., the first solution); after sodium carbonate is an aqueous solution (i.e., the second solution), carbonate ions become free; by dispersing bamboo fiber powder in the first solution, a suspension of bamboo fiber powder (i.e., the first mixture) can be obtained; the second solution is added dropwise into the first mixture and stirred simultaneously, and the free zinc ions and calcium ions react with carbonate ions to generate calcium carbonate and less zinc carbonate. Metal carbonates that are insoluble or slightly soluble in water are deposited on the surface of bamboo fiber powder to form a coating layer. The calcium carbonate coating layer can improve the mechanical properties of bamboo fiber and improve the interfacial bonding between bamboo fiber and resin. Metal zinc as an inorganic antibacterial agent and lauryl trimethyl ammonium chloride as an organic antibacterial agent can give bamboo fiber a better mildew-proof effect. In addition, since calcium carbonate has a porous structure, wet chemical coating allows zinc ions and lauryltrimethylammonium chloride to adhere and fill the pores of calcium carbonate, thereby improving their bonding ability with bamboo fibers, preventing their loss, and improving the long-term mildew-proof effect of the fiber fabric.

[0085] The subsequent antimicrobial coating and modification treatment further improves the antimicrobial ability of the bamboo fiber. The antimicrobial agent used for the coating and modification treatment of the present invention is isothiazolinone. As a macromolecular polymer antimicrobial agent, isothiazolinone has the characteristics of good heat resistance, high structural stability, and is not easy to migrate in the material matrix.

[0086] The invention utilizes the amidation polymerization reaction between 3,5-bis(trimellitic anhydride ester)benzoylbenzisothiazolinone and 1,2-bis(2-aminoethoxy)ethane to prepare the benzisothiazolinone copolymer. The specific implementation method is: first, 3,5-di(trimellitic anhydride)benzoylbenzisothiazolinone and the first solid are uniformly mixed in N-methylpyrrolidone (i.e., the second mixture); then, 1,2-bis(2-aminoethoxy)ethane is dispersed in N-methylpyrrolidone, hydrogenated castor oil is used as a lubricant, lauryl phosphate is used as an emulsifier and a solubilizer, and γ-aminopropyltriethoxysilane is used as a surfactant, and castor oil and water are added for ultrasonic emulsification to obtain an emulsion containing 1,2-bis(2-aminoethoxy)ethane (i.e., the third mixture). By gradually adding the third mixture to the second mixture and stirring simultaneously, 1,2-bis(2-aminoethoxy)ethane can be brought into contact with and react with 3,5-di(trimellitic anhydride)benzoylbenzisothiazolinone to generate a benzisothiazolinone copolymer coating layer that can be deposited on the calcium carbonate coating layer of the bamboo fiber. Due to the specific pore structure of calcium carbonate, at least part of the benzisothiazolinone copolymer obtained by the wet chemical coating process can be deposited and filled in the pores of calcium carbonate, and the benzisothiazolinone copolymer prepared by the above reaction contains hydrophilic carboxyl groups and ether bonds, and its ability to bind to bamboo fiber and calcium carbonate as an inorganic substance is relatively strong. Therefore, the above steps of the present invention can obtain a long-lasting anti-mildew and antibacterial fabric with good anti-mildew and antibacterial effects, and the anti-mildew and antibacterial functional components are not easy to lose.

[0087] Example 1

[0088] In this embodiment, a number of hygroscopic and antibacterial plant fiber samples are prepared. The raw material ratios of hygroscopic and antibacterial plant fiber samples 1 to 4 are shown in Table 1. The specific preparation process is as follows.

[0089] S1. According to the mass ratio in Table 1, zinc chloride and calcium chloride are added into water, mixed and stirred evenly to prepare a first solution;

[0090] S2. According to the mass ratio in Table 1, lauryl trimethyl ammonium chloride and sodium carbonate were added into water, mixed and stirred evenly to prepare a second solution;

[0091] S3. According to the mass ratio in Table 1, firstly heat the first solution to 55° C., then add the crushed and ground bamboo fiber powder with a particle size of 20 μm to 50 μm to the first solution, control the system temperature at 55° C.±2° C., keep warm and stir magnetically for 20 min, to obtain a first mixture;

[0092] S4. According to the volume ratio in Table 1, after the stirring is completed, the second solution is gradually and slowly added dropwise into the first mixture and magnetically stirred simultaneously. After the addition is completed, the mixture is allowed to stand for 2 hours to precipitate bamboo fiber powder particles with calcium carbonate and a small amount of zinc carbonate, and the first solid is obtained by filtering;

[0093] S5. According to the mass ratio in Table 1, 3,5-di(trimellitic anhydride)benzoylbenzisothiazolinone, the first solid and N-methylpyrrolidone are magnetically stirred at a temperature of 40° C. to mix them uniformly to obtain a second mixture;

[0094] S6. According to the mass ratio in Table 1, hydrogenated castor oil, lauryl phosphate, γ-aminopropyl tri-5-ethoxysilane, 1,2-bis(2-aminoethoxy)ethane and N-methylpyrrolidone are first ultrasonically mixed uniformly.

[0095] Castor oil and water were then added, the temperature was raised to 45° C., and ultrasonic mixing was continued to be uniform to prepare a third mixture;

[0096] S7. According to the mass ratio in Table 1, gradually add the third mixture into the second mixture and stir simultaneously.

[0097] After the addition is completed, the temperature is raised to 40° C. and stirring is continued for 6 hours, followed by filtration, washing and drying to obtain the hygroscopic and anti-10-bacteria plant fiber.

[0098] Table 1

[0099]

[0100] Example 2

[0101] In this embodiment, a number of spandex fiber samples are prepared. Spandex fiber samples 5 to 8 correspond to samples 1 to 4 in sequence, as hygroscopic and antibacterial plant fibers. The specific preparation process is as follows.

[0102] S1. According to the mass ratio of maleic anhydride grafted POE: hygroscopic antibacterial plant fiber: polyurethane elastomer = 15:30:100, the maleic anhydride grafted POE, the hygroscopic antibacterial plant fiber and the polyurethane elastomer are stirred and kneaded uniformly to obtain a composite polyurethane elastomer;

[0103] S2. Melt-spinning the composite polyurethane elastomer at a temperature of 175° C. to 185° C. to obtain spandex fibers.

[0104] Example 3

[0105] In this embodiment, a polyester fiber sample 9 is prepared, and its preparation process is as follows.

[0106] S1. Polyethylene glycol, water and polytetrafluoroethylene are mixed evenly in a mass ratio of polyethylene glycol: water: polytetrafluoroethylene = 15:20:100, and sent to a plasma generator for plasma treatment at a power of 200 W for 15 minutes. After the treatment, the mixture is washed with water and dried to obtain hydrophilically modified polytetrafluoroethylene;

[0107] S2. Sodium dodecylbenzene sulfonate, polytetrafluoroethylene after hydrophilic modification and polyethylene terephthalate are uniformly mixed in a mass ratio of sodium dodecylbenzene sulfonate: polytetrafluoroethylene: polyethylene terephthalate = 2:5:100, and extruded into granules to obtain a masterbatch;

[0108] S3. Melt-spinning the dried masterbatch at a temperature of 250° C. to 300° C. to prepare polyester fibers.

[0109] Example 4

[0110] This embodiment prepares moisture-absorbing and antibacterial fabric samples 10 to 13. Samples 10 to 13 respectively use spandex fiber samples 5 to 8 and polyester fiber sample 9, respectively, at a ratio of 25% spandex fiber to 75% polyester fiber, and the spandex fiber and polyester fiber are spun into synthetic yarns, and the synthetic yarns are used to weave the moisture-absorbing and antibacterial fabrics.

[0111] Comparative Example 1

[0112] In this comparative example, a moisture-absorbing and antibacterial fabric sample 14 is prepared, and its preparation process is as follows.

[0113] S1. According to the mass ratio of maleic anhydride grafted POE: bamboo fiber: polyurethane elastomer = 15:30:100, the maleic anhydride grafted POE, bamboo fiber and polyurethane elastomer are stirred and kneaded uniformly to obtain a composite polyurethane elastomer;

[0114] S2, melt-spinning the composite polyurethane elastomer at a temperature of 175° C. to 185° C. to obtain spandex fibers;

[0115] S3, polyethylene glycol, water and polytetrafluoroethylene are mixed evenly in a mass ratio of polyethylene glycol: water: polytetrafluoroethylene = 15:20:100, and sent to a plasma generator, and plasma treatment is performed at a power of 200 W for 15 minutes. After the treatment, the mixture is washed with water and dried to obtain hydrophilically modified polytetrafluoroethylene;

[0116] S4, mixing sodium dodecylbenzene sulfonate, polytetrafluoroethylene after hydrophilic modification and polyethylene terephthalate in a mass ratio of sodium dodecylbenzene sulfonate: polytetrafluoroethylene: polyethylene terephthalate = 2:5:100, extruding and granulating to obtain a masterbatch;

[0117] S5, melt-spinning the dried masterbatch at a temperature of 250° C. to 300° C. to prepare polyester fibers;

[0118] S6. Spandex fiber and polyester fiber are spun into synthetic silk thread in a ratio of 25% of spandex fiber and 75% of polyester fiber, and the synthetic silk thread is used for weaving to obtain a moisture-absorbing and antibacterial fabric.

[0119] Comparative Example 2

[0120] S1. Mixing calcium chloride in water at a mass ratio of calcium chloride to water = 15:100 to prepare a first solution;

[0121] S2. Mixing sodium carbonate in water in a mass ratio of sodium carbonate to water = 15:100 to obtain a second solution;

[0122] S3, heating the first solution to 50° C. to 55° C. at a mass ratio of bamboo fiber powder to first solution = 15:100, adding the bamboo fiber powder to the first solution, and stirring at the temperature for 20 min to 30 min to obtain a first mixture;

[0123] S4, according to the volume ratio of the first solution: the second solution = 100:100, after the stirring is completed, the second solution is added dropwise into the first mixture and stirred simultaneously, after the dropwise addition is completed, it is allowed to stand for 1 hour to 2 hours, and the bamboo fiber subjected to the surface treatment of the calcium carbonate wet chemical coating deposition is obtained by filtering;

[0124] S5, stirring and kneading the maleic anhydride grafted POE, the bamboo fiber surface treated by calcium carbonate wet chemical coating deposition, and the polyurethane elastomer in a mass ratio of maleic anhydride grafted POE: bamboo fiber: polyurethane elastomer = 15:30:100 to obtain a composite polyurethane elastomer;

[0125] S6, melt-spinning the composite polyurethane elastomer at a temperature of 175° C. to 185° C. to obtain spandex fibers;

[0126] S7, polyethylene glycol, water and polytetrafluoroethylene are mixed evenly in a mass ratio of polyethylene glycol: water: polytetrafluoroethylene = 15:20:100, and sent to a plasma generator, and plasma treatment is performed at a power of 200 W for 15 minutes. After the treatment, the mixture is washed with water and dried to obtain hydrophilically modified polytetrafluoroethylene;

[0127] S8, mixing sodium dodecylbenzene sulfonate, polytetrafluoroethylene after hydrophilic modification and polyethylene terephthalate in a mass ratio of sodium dodecylbenzene sulfonate: polytetrafluoroethylene: polyethylene terephthalate = 2:5:100, extruding and granulating to obtain a masterbatch;

[0128] S9, melt-spinning the dried masterbatch at a temperature of 250° C. to 300° C. to prepare polyester fibers;

[0129] S10. Spandex fiber and polyester fiber are spun into synthetic silk thread in a ratio of 25% of spandex fiber and 75% of polyester fiber, and the synthetic silk thread is used for weaving to obtain a moisture-absorbing and antibacterial fabric.

[0130] Performance Testing

[0131] Hygroscopic and antibacterial fabric samples 10 to 13 were selected to test their water absorption. Samples 10 to 13 were cut into 10 cm×10 cm specimens respectively, and their hygroscopic properties were tested with reference to GB / T21655.1-2008, and their antibacterial properties were tested with reference to GB / T20944.3-2008.

[0132] Table 3

[0133]

[0134]

[0135] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A method for preparing a hygroscopic and antibacterial fabric for knitted clothing, characterized in that: The moisture-absorbing and antibacterial fabric is made by blending the following fibers: Spandex fiber, 20%-30%; Polyester fiber, 70%-80%; The spandex fiber includes hygroscopic antibacterial plant fiber, which is prepared by using raw materials including bamboo fiber powder, and undergoing surface treatment by calcium carbonate wet chemical coating deposition and antibacterial agent coating modification. The hygroscopic antibacterial plant fiber is prepared by the following steps: S111, mixing zinc chloride and calcium chloride in water to obtain a first solution; S112, uniformly mixing lauryltrimethylammonium chloride and sodium carbonate in water to prepare a second solution; S113, heating the first solution to 50° C. to 55° C., adding bamboo fiber powder to the first solution, and stirring at the temperature for 20 min to 30 min to obtain a first mixture; S114, after the stirring is completed, the second solution is added dropwise into the first mixture while stirring simultaneously, after the addition is completed, the mixture is allowed to stand for 1 to 2 hours, and filtered to obtain a first solid; S115, uniformly mixing 3,5-di(trimellitic anhydride)benzoylbenzisothiazolinone, the first solid and N-methylpyrrolidone to obtain a second mixture; S116, mixing hydrogenated castor oil, lauryl phosphate, γ-aminopropyltriethoxysilane, 1,2-bis(2-aminoethoxy)ethane, and N-methylpyrrolidone by ultrasonication, and then adding castor oil and water and continuing to mix by ultrasonication to obtain a third mixture; S117, gradually adding the third mixture to the second mixture and stirring simultaneously, raising the temperature to 38° C. to 40° C. after the addition is completed, and continuously stirring for 6 h to 8 h, filtering, washing, and drying to obtain the hygroscopic antibacterial plant fiber.

2. The preparation method according to claim 1, characterized in that: The preparation method comprises: S100, preparing the hygroscopic and antibacterial plant fiber; S200, preparing the spandex fiber by melt spinning using raw materials including a polyurethane elastomer and the hygroscopic antibacterial plant fiber; S300, using raw materials including polyethylene terephthalate and polytetrafluoroethylene to prepare the polyester fiber through melt spinning; S400, spinning the spandex fiber and the polyester fiber into synthetic silk threads, and weaving the synthetic silk threads to obtain the moisture-absorbing and antibacterial fabric.

3. The preparation method according to claim 1, characterized in that: In S111, by mass ratio, zinc chloride: calcium chloride: water = (4-6): (10-20): 100; and / or In S112, the mass ratio of lauryl trimethyl ammonium chloride: sodium carbonate: water is (1-2): (10-15): 100; and / or In S113, in terms of mass ratio, bamboo fiber powder: first solution = (10-20): 100; and / or In S114, the volume ratio of the first solution to the second solution is (80-120):

100.

4. The preparation method according to claim 1, characterized in that: In S115, the mass ratio of 3,5-di(trimellitic anhydride ester)benzoylbenzisothiazolinone:first solid:N-methylpyrrolidone=(10-20):(30-40):100; and / or In S116, the mass ratio of hydrogenated castor oil: lauryl phosphate: γ-aminopropyltriethoxysilane: 1,2-bis(2-aminoethoxy)ethane: N-methylpyrrolidone: castor oil: water is (1-2): (2-4): (3-6): (10-20): (30-40): (30-40): 100; and / or In S117, the mass ratio of the second mixture to the third mixture is (80-120):

100.

5. The preparation method according to claim 2, characterized in that: S200 specifically includes: S211, stirring and kneading the maleic anhydride grafted POE, the hygroscopic antibacterial plant fiber and the polyurethane elastomer to obtain a composite polyurethane elastomer; S212, melt-spinning the composite polyurethane elastomer at a temperature of 175° C. to 185° C. to obtain the spandex fiber.

6. The preparation method according to claim 5, characterized in that: In S211, based on the mass ratio, maleic anhydride grafted POE: hygroscopic antibacterial plant fiber: polyurethane elastomer = (15-20): (30-40):

100.

7. The preparation method according to claim 2, characterized in that: S300 specifically includes: S311, mixing the sodium dodecylbenzene sulfonate, the polytetrafluoroethylene subjected to hydrophilic modification and the polyethylene terephthalate in a mass ratio of sodium dodecylbenzene sulfonate:polytetrafluoroethylene:polyethylene terephthalate=(2-4):(4-6):100, and extruding and granulating to obtain a masterbatch; S312, melt-spinning the dried masterbatch at a temperature of 250° C. to 300° C. to prepare the polyester fiber.

8. The preparation method according to claim 7, characterized in that: The hydrophilic modification treatment comprises: S310, the polyethylene glycol, the water and the polytetrafluoroethylene are uniformly mixed in a mass ratio of polyethylene glycol: water: polytetrafluoroethylene = (15-20): (15-20): 100, and sent to a plasma generator for plasma treatment at a power of 200 W to 220 W for 10 min to 15 min. After the treatment, the mixture is washed with water and dried to obtain the hydrophilically modified polytetrafluoroethylene.

9. A moisture-absorbing and antibacterial fabric for knitted clothing, characterized in that: The hygroscopic and antibacterial fabric for knitted clothing is obtained by the preparation method according to any one of claims 1 to 8.

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