Hemp-based moisture-absorbing composite anti-wrinkle fabric and preparation method

Abstract

The present invention relates to the technical field of layered composite fabrics and discloses a hemp-based moisture-absorbing composite wrinkle-resistant fabric and its preparation method. The preparation method comprises: activating hemp / cotton blended yarn, then subjecting it to antibacterial finishing to obtain an antibacterial modified hemp / cotton blended yarn; weaving the antibacterial modified hemp / cotton blended yarn with pure cotton fiber yarn; impregnating the resulting single-layer fabric with an anti-wrinkle finishing solution; and then laminating and compounding the resulting single-layer fabric to obtain the hemp-based moisture-absorbing composite wrinkle-resistant fabric. The fabric has excellent antibacterial, moisture-absorbing, and wrinkle-resistant properties.

Description

Technical Field

[0001] The invention relates to the technical field of layered composite fabrics, and in particular to a hemp-based moisture-absorbing composite wrinkle-resistant fabric and a preparation method thereof. Background Art

[0002] Although hemp fiber has unique functions such as natural antibacterial, antibacterial, moisture-absorbing and cooling, and UV resistance, it has problems such as rough feel, easy wrinkling, pilling, and difficulty in care. In particular, the fabric surface is severely wrinkled after washing and the size is extremely unstable, which limits its application.

[0003] There are two main theories for wrinkle-resistant fabric finishing: resin deposition theory and covalent crosslinking theory. Covalent finishing agents typically possess two or more reactive groups, allowing them to form covalent crosslinks with the fabric, connecting the fiber molecular chains and enabling them to quickly recover from deformation, thereby reducing wrinkles. The resin deposition theory states that after curing, the finishing agent forms a network structure within the fibers or between fiber macromolecular chains, hindering the deformation and movement of the fiber molecular chains, thereby improving the fabric's recovery properties and achieving an anti-wrinkle effect.

[0004] Existing technologies, such as Chinese patent CN108532088A, disclose a double-layer, double-faced hemp fabric. This fabric is woven by blending hemp fiber with polylactic acid fiber to create the inner layer; and blending hemp fiber with polyester fiber to create the outer layer. The inner and outer layers are then combined to create a hemp double-layer fabric that exhibits excellent dye fastness, easy cleaning, light resistance, skin-friendliness, and UV resistance. However, this solution does not effectively improve the hemp fiber's tendency to wrinkle, nor does it improve the fabric's moisture absorption and antibacterial properties. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a hemp-based moisture-absorbing composite wrinkle-resistant fabric and a preparation method thereof, which has good antibacterial and moisture-absorbing effects and excellent wrinkle-resistant effects.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A method for preparing a hemp-based moisture-absorbing composite wrinkle-resistant fabric comprises the following steps:

[0008] Step (1), blending hemp fiber and cotton fiber to obtain hemp / cotton blended yarn; mixing the hemp / cotton blended yarn with a sodium hydroxide aqueous solution, activating it, taking it out after the activation, washing it, and obtaining the activated hemp / cotton blended yarn;

[0009] The activated hemp / cotton blended yarn is mixed with an antibacterial finishing liquid, reacted, taken out after the reaction is completed, and dried to obtain an antibacterial modified hemp / cotton blended yarn;

[0010] The antibacterial finishing liquid is prepared by the following steps:

[0011] S11, mixing p-hydroxybenzaldehyde, biuret, and a hydrogen chloride aqueous solution, reacting, and purifying after the reaction to obtain product A;

[0012] S12, mixing succinic anhydride, 3-dimethylamino-1-propanol, and tetrahydrofuran, reacting, adding 2-chloro-4,6-dimethoxy-1,3,5-triazine and N-methylmorpholine, stirring, filtering, collecting the filter cake, and recrystallizing to obtain product B;

[0013] S13, mixing product A, product B, and dichloromethane, adding catalysts of palladium acetate and potassium phosphate, and reacting. After the reaction is completed, filtering, rotary evaporation, and recrystallization are performed to obtain product C;

[0014] S14, mixing product C and a 10 wt% aqueous sodium hypochlorite solution, chlorinating, and after the chlorination is completed, rotary evaporation, and drying to obtain a chlorinated product C; mixing the chlorinated product C, γ-chloropropyltrimethoxysilane, and ethanol, reacting, after the reaction is completed, rotary evaporation, and drying to obtain an antibacterial agent; mixing the antibacterial agent with water to obtain an antibacterial finishing solution;

[0015] Step (2), using the antibacterial modified hemp / cotton blended yarn as the warp and the pure cotton fiber yarn as the weft to weave a single-layer fabric;

[0016] The single-layer fabric is dipped into the anti-wrinkle finishing liquid, and after the dipping is completed, it is dried to obtain the outer layer fabric and the inner layer fabric respectively;

[0017] The anti-wrinkle finishing liquid is prepared by the following steps:

[0018] S21, mixing amination zinc oxide and N,N-dimethylformamide, ultrasonically dispersing, adding succinic anhydride, reacting, filtering, washing, and drying after the reaction is completed to obtain carboxylated zinc oxide;

[0019] S22, mixing maleic acid, itaconic acid, acrylic acid, and water, adding dropwise an aqueous solution of ammonium persulfate, and reacting after the addition is complete. After the reaction is complete, an aqueous solution of a polycarboxylic acid copolymer with a solid content of 100% is obtained;

[0020] Mixing carboxylated zinc oxide, a polycarboxylic acid copolymer aqueous solution, a catalyst sodium hypophosphite, and water to obtain an anti-wrinkle finishing liquid;

[0021] Step (3): laminating the outer fabric and the inner fabric, stacking and aligning them, and sewing the outer fabric and the inner fabric with cotton sewing thread through a multi-layer fabric quilting machine to obtain a hemp-based moisture-absorbing composite wrinkle-resistant fabric.

[0022] Preferably, in step (1), the mass ratio of hemp fiber to cotton fiber is 20-30:70-80; the yarn count of the hemp / cotton blended yarn is 60S in British standard; the bath ratio of the hemp / cotton blended yarn to the sodium hydroxide aqueous solution is 1:40-50, and the sodium hydroxide aqueous solution is a 1 mol / L sodium hydroxide aqueous solution; and the activation conditions are: activation at room temperature for 1-1.5 h.

[0023] Preferably, in step (1), the bath ratio of the activated hemp / cotton blended yarn to the antibacterial finishing liquid is 1:30-40; and the reaction conditions are: reaction at a temperature of 85-90° C. for 20-30 minutes.

[0024] Preferably, when preparing the antibacterial finishing liquid in step (1), in S11, the mass ratio of p-hydroxybenzaldehyde, biuret, and hydrogen chloride aqueous solution is 4.8-5:4.2-4.5:38-40, and the hydrogen chloride aqueous solution is a 37 wt % hydrogen chloride aqueous solution; and the reaction conditions are: reacting at room temperature for 22-26 h.

[0025] Preferably, when preparing the antibacterial finishing liquid in step (1), in S11: the purification operation includes: taking the reaction product after the reaction is completed, adding 0°C ice water with a mass of 8-10 times that of the reaction product, filtering, taking the filter cake, washing until the pH value of the washing liquid is 5, drying at a temperature of 50-60°C for 8-10 hours, and then recrystallizing with water.

[0026] Preferably, when preparing the antibacterial finishing liquid in step (1), in S12, the mass ratio of succinic anhydride, 3-dimethylamino-1-propanol, tetrahydrofuran, 2-chloro-4,6-dimethoxy-1,3,5-triazine, and N-methylmorpholine is 3:3-3.1:120-150:4.5-4.6:2.5-2.6; the reaction conditions are: reacting at a temperature of 75-85°C for 1-1.5h; and the stirring conditions are: stirring at a temperature of 0°C for 1h.

[0027] Preferably, when preparing the antibacterial finishing liquid in step (1), in S13: the mass ratio of product A, product B, dichloromethane, palladium acetate, and potassium phosphate is 0.7-0.8:0.9-1:15-20:0.01-0.02:0.01-0.02; and the reaction conditions are: reaction at a temperature of 70-80°C for 1-2h.

[0028] Preferably, when preparing the antibacterial finishing liquid in step (1), in S14: the mass ratio of product C and 10wt% sodium hypochlorite aqueous solution is 1:10; the chlorination conditions are: chlorination at room temperature for 1-1.5h; the mass ratio of chlorinated product C, γ-chloropropyltrimethoxysilane, and ethanol is 2.4-2.5:1-1.3:50-60; the reaction conditions are: reaction at a temperature of 75-85°C for 8-10h; and the mass ratio of antibacterial agent to water is 1-1.5:100.

[0029] Preferably, in step (2): the weight of the single-layer fabric is 120-140 g / m 2 The bath ratio of single-layer fabric to anti-wrinkle finishing liquid is 1:20-30; the padding conditions are: dipping at room temperature for 5-8 minutes, two dippings and two paddings, and the padding rate is 90-100%; the drying conditions are: pre-drying at 80-85℃ for 2-3 minutes, and baking at 170-180℃ for 2-3 minutes.

[0030] Preferably, when preparing the anti-wrinkle finishing liquid in step (2), in S21: the mass ratio of amino zinc oxide, N,N-dimethylformamide, and succinic anhydride is 0.2-0.25:70-80:0.7; and the reaction conditions are: reaction at a speed of 500-600 r / min and room temperature for 20-24 hours.

[0031] Preferably, when preparing the wrinkle-resistant finishing liquid in step (2), in S22: the molar ratio of maleic acid, itaconic acid, acrylic acid, and ammonium persulfate is 1:1:1:0.1-0.12; the ammonium persulfate aqueous solution is a 30wt% ammonium persulfate aqueous solution, and the dropwise addition conditions are: dropwise addition for 2-2.5h at a temperature of 80-85°C in a nitrogen atmosphere; the reaction conditions are: reaction at a temperature of 80-85°C for 0.5-1h; the solid content of the polycarboxylic acid copolymer aqueous solution is 30wt%; and the mass ratio of carboxylated zinc oxide, polycarboxylic acid copolymer aqueous solution, catalyst sodium hypophosphite, and water is 1-1.5:25-30:4-5:100.

[0032] Preferably, a hemp-based moisture-absorbing composite anti-wrinkle fabric is prepared by the preparation method of the hemp-based moisture-absorbing composite anti-wrinkle fabric as described above.

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

[0034] The invention uses p-hydroxybenzaldehyde, biuret, succinic anhydride and 3-dimethylamino-1-propanol to prepare product C with a halogenamine precursor structure, chlorinates the product C and reacts it with γ-chloropropyltrimethoxysilane to undergo a quaternization reaction to obtain a multifunctional antibacterial agent containing a quaternary ammonium salt cation structure, a halogenamine structure and an organic silicon segment, and prepares the product C into an antibacterial finishing liquid to perform antibacterial finishing on hemp / cotton blended yarn after alkali treatment and activation. The siloxane structure in the antibacterial agent reacts with the hydroxyl group of cellulose in the yarn. During finishing, dehydration condensation occurs, causing the antibacterial component to bond to the activated hemp / cotton blended yarn, thereby producing an antibacterial modified hemp / cotton blended yarn. The quaternary ammonium salt and the halamine have a synergistic antibacterial effect, which imparts excellent antibacterial properties to the blended yarn. The introduction of the quaternary ammonium salt cationic group imparts cationic groups to the surface of the antibacterial modified hemp / cotton blended yarn, thereby increasing the hydrophilic and moisture-absorbing capacity of the blended yarn. The organosilicon chain segment increases the softness of the blended yarn, thereby improving the wearing comfort of the fabric.

[0035] The present invention weaves antibacterial modified hemp / cotton blended yarn and pure cotton fiber into a single-layer fabric, and uses an anti-wrinkle finishing liquid containing a polycarboxylic acid copolymer to perform anti-wrinkle finishing on the single-layer fabric. The outer layer fabric and the inner layer fabric are laminated and composited to obtain a hemp-based moisture-absorbing composite anti-wrinkle fabric; wherein the anti-wrinkle finishing liquid is prepared by mixing carboxylated zinc oxide, a polycarboxylic acid copolymer aqueous solution, a catalyst sodium hypophosphite, and water. The carboxylated zinc oxide can not only improve the antibacterial performance of the fabric, but also can undergo esterification reaction with the polycarboxylic acid copolymer and the cellulose fiber of the fabric during impregnation, and can interact with the cationic groups on the antibacterial modified hemp / cotton blended yarn, effectively limiting the relative sliding between fiber molecules, and synergistically improving the anti-wrinkle effect of the fabric; the multi-layer fabric can structurally improve the anti-wrinkle ability of the composite fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a process flow chart for preparing hemp-based moisture-absorbing composite wrinkle-resistant fabrics in the present invention;

[0037] Figure 2 Schematic diagram of the structure of the hemp-based moisture-absorbing composite wrinkle-resistant fabric prepared in the present invention;

[0038] Figure 3 It is a histogram of wrinkle recovery angles in performance tests of hemp-based composite fabrics prepared in the examples and comparative examples of the present invention;

[0039] Figure 4 It is a bar graph of the antibacterial rate of hemp-based composite fabrics prepared in the examples and comparative examples of the present invention in the performance test;

[0040] In the picture:

[0041] 1. Outer fabric; 2. Inner fabric. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all 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.

[0043] Example 1

[0044] This embodiment discloses a method for preparing a hemp-based moisture-absorbing composite wrinkle-resistant fabric, comprising the following steps:

[0045] Step (1), blending hemp fiber and cotton fiber in a mass ratio of 30:70 to obtain hemp / cotton blended yarn with a yarn count of British count 60S; mixing the hemp / cotton blended yarn with a 1 mol / L sodium hydroxide aqueous solution at a bath ratio of 1:40, activating the yarn at room temperature for 1 hour, taking it out after the activation is completed, and washing it to neutrality to obtain the activated hemp / cotton blended yarn;

[0046] The activated hemp / cotton blended yarn was mixed with the antibacterial finishing liquid at a bath ratio of 1:30, reacted at 85°C for 30 minutes, taken out after the reaction, and dried at 50°C for 48 hours to obtain the antibacterial modified hemp / cotton blended yarn;

[0047] The antibacterial finishing liquid is prepared by the following steps:

[0048] S11, p-Hydroxybenzaldehyde, biuret, and 37 wt% aqueous hydrogen chloride solution were mixed in a mass ratio of 4.9:4.3:40, and reacted at room temperature for 24 h. After the reaction, a reaction product was obtained, and 0°C ice water (10 times the mass of the reaction product) was added, filtered, and the filter cake was taken, washed until the pH value of the washing solution was 5, dried at 55°C for 8 h, and then recrystallized with water to obtain product A;

[0049] S12. Succinic anhydride, 3-dimethylamino-1-propanol, and tetrahydrofuran were mixed and reacted at 80°C for 1 hour. After the reaction, 2-chloro-4,6-dimethoxy-1,3,5-triazine and N-methylmorpholine were added, and the mixture was stirred at 0°C for 1 hour. The mixture was filtered, and the filter cake was collected and recrystallized using dichloromethane to obtain product B.

[0050] The mass ratio of succinic anhydride, 3-dimethylamino-1-propanol, tetrahydrofuran, 2-chloro-4,6-dimethoxy-1,3,5-triazine, and N-methylmorpholine is 3:3.05:130:4.55:2.55;

[0051] S13, mixing product A, product B, and dichloromethane, adding catalysts of palladium acetate and potassium phosphate, and reacting at 75°C for 1.5 hours. After the reaction is completed, filtering with suction, taking the filtrate, and removing the solvent dichloromethane by rotary evaporation, and then recrystallizing from dichloromethane to obtain product C;

[0052] Among them, the mass ratio of product A, product B, dichloromethane, palladium acetate, and potassium phosphate is 0.75:0.95:18:0.01:0.02;

[0053] S14, mixing product C and 10wt% sodium hypochlorite aqueous solution in a mass ratio of 1:10, chlorinating at room temperature for 1 hour, and after the chlorination is completed, removing the solvent water by rotary evaporation, and drying at 50°C for 30 hours to obtain chlorinated product C; mixing chlorinated product C, γ-chloropropyltrimethoxysilane, and ethanol in a mass ratio of 2.4:1:50, reacting at 75°C for 10 hours, and after the reaction is completed, removing the solvent ethanol by rotary evaporation, and drying at 50°C for 10 hours to obtain an antibacterial agent; mixing the antibacterial agent with water in a mass ratio of 1:100 to obtain an antibacterial finishing solution;

[0054] Step (2): Weaving the antibacterial modified hemp / cotton blended yarn as the warp and the pure cotton fiber yarn as the weft to obtain a weight of 120g / m 2 Single layer fabric;

[0055] The single-layer fabric was impregnated with the anti-wrinkle finishing liquid at a bath ratio of 1:20, and was immersed for 5 minutes at room temperature, with two immersions and two rollings, and the rolling rate was 90%. After the impregnation, it was pre-dried at 80°C for 3 minutes and baked at 170°C for 3 minutes to obtain the outer layer fabric and the inner layer fabric respectively;

[0056] The anti-wrinkle finishing liquid is prepared by the following steps:

[0057] S21, mixing amination zinc oxide and N, N-dimethylformamide, ultrasonically dispersing for 20 minutes, adding succinic anhydride, the mass ratio of amination zinc oxide, N, N-dimethylformamide, and succinic anhydride is 0.2:70:0.7, and reacting at a speed of 500r / min and room temperature for 24 hours. After the reaction is completed, filtering, taking the filter cake, adding water and ethanol 8 times the mass of the filter cake in sequence, washing three times, and drying at 50°C for 10 hours to obtain carboxylated zinc oxide;

[0058] S22, maleic acid, itaconic acid, acrylic acid, and water were mixed and stirred, and a 30 wt % aqueous solution of ammonium persulfate was added dropwise at 80° C. in a nitrogen atmosphere for 2 h. After the addition was complete, the mixture was reacted at 80° C. for 1 h. After the reaction was completed, an aqueous solution of a polycarboxylic acid copolymer having a solid content of 30 wt % was obtained;

[0059] The molar ratio of maleic acid, itaconic acid, acrylic acid and ammonium persulfate is 1:1:1:0.1;

[0060] Carboxylated zinc oxide, a polycarboxylic acid copolymer aqueous solution, a catalyst sodium hypophosphite, and water are mixed in a mass ratio of 1:25:4:100 to obtain an anti-wrinkle finishing liquid;

[0061] Step (3): laminating the outer fabric and the inner fabric, stacking and aligning them, and sewing the outer fabric and the inner fabric with cotton sewing thread through a multi-layer fabric quilting machine to obtain a hemp-based moisture-absorbing composite wrinkle-resistant fabric.

[0062] Example 2

[0063] This embodiment discloses a method for preparing a hemp-based moisture-absorbing composite wrinkle-resistant fabric, comprising the following steps:

[0064] Step (1), blending hemp fiber and cotton fiber in a mass ratio of 30:70 to obtain hemp / cotton blended yarn with a yarn count of British count 60S; mixing the hemp / cotton blended yarn with a 1 mol / L sodium hydroxide aqueous solution at a bath ratio of 1:40, activating the yarn at room temperature for 1 hour, taking it out after the activation is completed, and washing it to neutrality to obtain the activated hemp / cotton blended yarn;

[0065] The activated hemp / cotton blended yarn was mixed with the antibacterial finishing liquid at a bath ratio of 1:35, reacted at 85°C for 30 minutes, taken out after the reaction, and dried at 55°C for 48 hours to obtain the antibacterial modified hemp / cotton blended yarn;

[0066] The antibacterial finishing liquid is prepared by the following steps:

[0067] The product C and a 10 wt% aqueous sodium hypochlorite solution were mixed in a mass ratio of 1:10, chlorinated at room temperature for 1 hour, and after the chlorination was completed, the solvent water was removed by rotary evaporation, and dried at 50°C for 30 hours to obtain a chlorinated product C; the chlorinated product C, γ-chloropropyltrimethoxysilane, and ethanol were mixed in a mass ratio of 2.43:1.1:55, reacted at 80°C for 9 hours, and after the reaction was completed, the solvent ethanol was removed by rotary evaporation, and dried at 55°C for 9 hours to obtain an antibacterial agent; the antibacterial agent and water were mixed in a mass ratio of 1.2:100 to obtain an antibacterial finishing liquid;

[0068] Wherein, the preparation of product C is the same as that in Example 1;

[0069] Step (2): Weaving the antibacterial modified hemp / cotton blended yarn as the warp and the pure cotton fiber yarn as the weft to obtain a weight of 125 g / m 2 Single layer fabric;

[0070] The single-layer fabric was impregnated with the anti-wrinkle finishing liquid at a bath ratio of 1:20 and immersed at room temperature for 6 minutes, with two immersions and two rollings, and the rolling rate was 95%. After the impregnation, the fabric was pre-dried at 80°C for 3 minutes and baked at 175°C for 2.5 minutes to obtain the outer layer fabric and the inner layer fabric respectively;

[0071] The anti-wrinkle finishing liquid is prepared by the following steps:

[0072] Maleic acid, itaconic acid, acrylic acid, and water were mixed and stirred, and a 30 wt % aqueous solution of ammonium persulfate was added dropwise at 80° C. in a nitrogen atmosphere for 2 h. After the addition was complete, the mixture was reacted at 80° C. for 1 h. After the reaction was completed, an aqueous solution of a polycarboxylic acid copolymer with a solid content of 30 wt % was obtained;

[0073] The molar ratio of maleic acid, itaconic acid, acrylic acid and ammonium persulfate is 1:1:1:0.1;

[0074] Carboxylated zinc oxide, a polycarboxylic acid copolymer aqueous solution, a catalyst sodium hypophosphite, and water were mixed in a mass ratio of 1.2:26:4.5:100 to obtain an anti-wrinkle finishing liquid;

[0075] The preparation of carboxylated zinc oxide is the same as that in Example 1;

[0076] Step (3): laminating the outer fabric and the inner fabric, stacking and aligning them, and sewing the outer fabric and the inner fabric with cotton sewing thread through a multi-layer fabric quilting machine to obtain a hemp-based moisture-absorbing composite wrinkle-resistant fabric.

[0077] Example 3

[0078] This embodiment discloses a method for preparing a hemp-based moisture-absorbing composite wrinkle-resistant fabric, comprising the following steps:

[0079] Step (1), blending hemp fiber and cotton fiber in a mass ratio of 30:70 to obtain a hemp / cotton blended yarn with a yarn count of British count 60S; mixing the hemp / cotton blended yarn with a 1 mol / L sodium hydroxide aqueous solution at a bath ratio of 1:45, activating the yarn at room temperature for 1.3 hours, taking it out after the activation is completed, and washing it to neutrality to obtain the activated hemp / cotton blended yarn;

[0080] The activated hemp / cotton blended yarn was mixed with the antibacterial finishing liquid at a bath ratio of 1:35, reacted at 88°C for 25 minutes, taken out after the reaction, and dried at 55°C for 48 hours to obtain the antibacterial modified hemp / cotton blended yarn;

[0081] The antibacterial finishing liquid is prepared by the following steps:

[0082] The product C and a 10 wt% aqueous sodium hypochlorite solution were mixed in a mass ratio of 1:10, and chlorinated at room temperature for 1.3 h. After the chlorination was completed, the solvent water was removed by rotary evaporation, and the mixture was dried at 55° C. for 26 h to obtain a chlorinated product C; the chlorinated product C, γ-chloropropyltrimethoxysilane, and ethanol were mixed in a mass ratio of 2.45:1.2:55, reacted at 80° C. for 9 h, and after the reaction was completed, the solvent ethanol was removed by rotary evaporation, and the mixture was dried at 55° C. for 9 h to obtain an antibacterial agent; the antibacterial agent was mixed with water in a mass ratio of 1.3:100 to obtain an antibacterial finishing liquid;

[0083] Wherein, the preparation of product C is the same as that in Example 1;

[0084] Step (2): using antibacterial modified hemp / cotton blended yarn as warp and pure cotton fiber yarn as weft to weave a fabric with a gram weight of 130 g / m 2 Single layer fabric;

[0085] The single-layer fabric was impregnated with the anti-wrinkle finishing liquid at a bath ratio of 1:25, and immersed at room temperature for 6 minutes, with two immersions and two rollings, and the rolling rate was 95%. After the impregnation, it was pre-dried at 83°C for 2.5 minutes and baked at 175°C for 2.5 minutes to obtain the outer layer fabric and the inner layer fabric respectively;

[0086] The anti-wrinkle finishing liquid is prepared by the following steps:

[0087] Maleic acid, itaconic acid, acrylic acid, and water were mixed and stirred, and a 30 wt % aqueous solution of ammonium persulfate was added dropwise at 83° C. in a nitrogen atmosphere for 2.3 h. After the addition was complete, the mixture was reacted at 83° C. for 0.8 h. After the reaction was completed, an aqueous solution of a polycarboxylic acid copolymer with a solid content of 30 wt % was obtained;

[0088] The molar ratio of maleic acid, itaconic acid, acrylic acid and ammonium persulfate is 1:1:1:0.11;

[0089] Carboxylated zinc oxide, a polycarboxylic acid copolymer aqueous solution, a catalyst sodium hypophosphite, and water were mixed in a mass ratio of 1.3:28:4.5:100 to obtain an anti-wrinkle finishing liquid;

[0090] The preparation of carboxylated zinc oxide is the same as that in Example 1;

[0091] Step (3): laminating the outer fabric and the inner fabric, stacking and aligning them, and sewing the outer fabric and the inner fabric with cotton sewing thread through a multi-layer fabric quilting machine to obtain a hemp-based moisture-absorbing composite wrinkle-resistant fabric.

[0092] Example 4

[0093] This embodiment discloses a method for preparing a hemp-based moisture-absorbing composite wrinkle-resistant fabric, comprising the following steps:

[0094] Step (1), blending hemp fiber and cotton fiber in a mass ratio of 30:70 to obtain hemp / cotton blended yarn with a yarn count of British count 60S; mixing the hemp / cotton blended yarn with a 1 mol / L sodium hydroxide aqueous solution at a bath ratio of 1:45, activating the yarn at room temperature for 1.5 hours, taking it out after the activation is completed, and washing it to neutrality to obtain the activated hemp / cotton blended yarn;

[0095] The activated hemp / cotton blended yarn was mixed with the antibacterial finishing liquid at a bath ratio of 1:35, reacted at 90°C for 20 minutes, taken out after the reaction, and dried at 55°C for 48 hours to obtain the antibacterial modified hemp / cotton blended yarn;

[0096] The antibacterial finishing liquid is prepared by the following steps:

[0097] The product C and a 10 wt% sodium hypochlorite aqueous solution were mixed in a mass ratio of 1:10, chlorinated at room temperature for 1.5 hours, and after the chlorination was completed, the solvent water was removed by rotary evaporation, and dried at 55°C for 26 hours to obtain a chlorinated product C; the chlorinated product C, γ-chloropropyltrimethoxysilane, and ethanol were mixed in a mass ratio of 2.48:1.25:55, reacted at 85°C for 8 hours, and after the reaction was completed, the solvent ethanol was removed by rotary evaporation, and dried at 55°C for 9 hours to obtain an antibacterial agent; the antibacterial agent and water were mixed in a mass ratio of 1.4:100 to obtain an antibacterial finishing liquid;

[0098] Wherein, the preparation of product C is the same as that in Example 1;

[0099] Step (2): Weaving the antibacterial modified hemp / cotton blended yarn as the warp and the pure cotton fiber yarn as the weft to obtain a weight of 135 g / m 2 Single layer fabric;

[0100] The single-layer fabric was impregnated with the anti-wrinkle finishing liquid at a bath ratio of 1:25, and immersed at room temperature for 6 minutes, with two immersions and two rollings, and the rolling rate was 95%. After the impregnation, it was pre-dried at 85°C for 2 minutes and baked at 175°C for 2.5 minutes to obtain the outer layer fabric and the inner layer fabric respectively;

[0101] The anti-wrinkle finishing liquid is prepared by the following steps:

[0102] Maleic acid, itaconic acid, acrylic acid, and water were mixed and stirred, and a 30 wt % aqueous solution of ammonium persulfate was added dropwise at 85° C. in a nitrogen atmosphere for 2.5 h. After the addition was complete, the mixture was reacted at 85° C. for 0.5 h. After the reaction was completed, an aqueous solution of a polycarboxylic acid copolymer with a solid content of 30 wt % was obtained;

[0103] The molar ratio of maleic acid, itaconic acid, acrylic acid and ammonium persulfate is 1:1:1:0.12;

[0104] Carboxylated zinc oxide, a polycarboxylic acid copolymer aqueous solution, a catalyst sodium hypophosphite, and water are mixed in a mass ratio of 1.4:29:4.5:100 to obtain an anti-wrinkle finishing liquid;

[0105] The preparation of carboxylated zinc oxide is the same as that in Example 1;

[0106] Step (3): laminating the outer fabric and the inner fabric, stacking and aligning them, and sewing the outer fabric and the inner fabric with cotton sewing thread through a multi-layer fabric quilting machine to obtain a hemp-based moisture-absorbing composite wrinkle-resistant fabric.

[0107] Example 5

[0108] This embodiment discloses a method for preparing a hemp-based moisture-absorbing composite wrinkle-resistant fabric, comprising the following steps:

[0109] Step (1), blending hemp fiber and cotton fiber in a mass ratio of 30:70 to obtain hemp / cotton blended yarn with a yarn count of British count 60S; mixing the hemp / cotton blended yarn with a 1 mol / L sodium hydroxide aqueous solution at a bath ratio of 1:50, activating the yarn at room temperature for 1.5 hours, taking it out after the activation is completed, and washing it to neutrality to obtain the activated hemp / cotton blended yarn;

[0110] The activated hemp / cotton blended yarn was mixed with the antibacterial finishing liquid at a bath ratio of 1:40, reacted at 90°C for 20 minutes, taken out after the reaction, and dried at 60°C for 48 hours to obtain the antibacterial modified hemp / cotton blended yarn;

[0111] The antibacterial finishing liquid is prepared by the following steps:

[0112] The product C and a 10 wt% aqueous sodium hypochlorite solution were mixed in a mass ratio of 1:10, chlorinated at room temperature for 1.5 hours, and after the chlorination was completed, the solvent water was removed by rotary evaporation, and dried at 60°C for 25 hours to obtain a chlorinated product C; the chlorinated product C, γ-chloropropyltrimethoxysilane, and ethanol were mixed in a mass ratio of 2.5:1.3:60, reacted at 85°C for 8 hours, and after the reaction was completed, the solvent ethanol was removed by rotary evaporation, and dried at 60°C for 8 hours to obtain an antibacterial agent; the antibacterial agent and water were mixed in a mass ratio of 1.5:100 to obtain an antibacterial finishing liquid;

[0113] Wherein, the preparation of product C is the same as that in Example 1;

[0114] Step (2): Weaving the antibacterial modified hemp / cotton blended yarn as the warp and the pure cotton fiber yarn as the weft to obtain a weight of 140g / m 2 Single layer fabric;

[0115] The single-layer fabric was immersed in the anti-wrinkle finishing liquid with a bath ratio of 1:30, immersed for 8 minutes at room temperature, and the mixture was double-dipped and double-rolled with a rolling rate of 100%. After the dipping, the fabric was pre-dried at 85°C for 2 minutes and baked at 180°C for 2 minutes to obtain the outer layer fabric and the inner layer fabric respectively.

[0116] The anti-wrinkle finishing liquid is prepared by the following steps:

[0117] Maleic acid, itaconic acid, acrylic acid, and water were mixed and stirred, and a 30 wt % aqueous solution of ammonium persulfate was added dropwise at 85° C. in a nitrogen atmosphere for 2.5 h. After the addition was complete, the mixture was reacted at 85° C. for 0.5 h. After the reaction was completed, an aqueous solution of a polycarboxylic acid copolymer with a solid content of 30 wt % was obtained;

[0118] The molar ratio of maleic acid, itaconic acid, acrylic acid and ammonium persulfate is 1:1:1:0.12;

[0119] Mixing carboxylated zinc oxide, a polycarboxylic acid copolymer aqueous solution, a catalyst sodium hypophosphite, and water in a mass ratio of 1.5:30:5:100 to obtain an anti-wrinkle finishing liquid;

[0120] The preparation of carboxylated zinc oxide is the same as that in Example 1;

[0121] Step (3): laminating the outer fabric and the inner fabric, stacking and aligning them, and sewing the outer fabric and the inner fabric with cotton sewing thread through a multi-layer fabric quilting machine to obtain a hemp-based moisture-absorbing composite wrinkle-resistant fabric.

[0122] Comparative Example 1

[0123] This comparative example discloses a method for preparing a hemp-based composite fabric, comprising the following steps:

[0124] Step (1), blending hemp fiber and cotton fiber in a mass ratio of 30:70 to obtain hemp / cotton blended yarn with a yarn count of British count 60S;

[0125] Step (2): Weaving the hemp / cotton blended yarn as the warp and the pure cotton fiber yarn as the weft to obtain a 120g / m2 2 Single layer fabric;

[0126] The single-layer fabric was impregnated with the anti-wrinkle finishing liquid at a bath ratio of 1:20, and was immersed for 5 minutes at room temperature, with two immersions and two rollings, and the rolling rate was 90%. After the impregnation, it was pre-dried at 80°C for 3 minutes and baked at 170°C for 3 minutes to obtain the outer layer fabric and the inner layer fabric respectively;

[0127] The anti-wrinkle finishing liquid is prepared by the following steps:

[0128] Maleic acid, itaconic acid, acrylic acid, and water were mixed and stirred, and a 30 wt % aqueous solution of ammonium persulfate was added dropwise at 80° C. in a nitrogen atmosphere for 2 h. After the addition was complete, the mixture was reacted at 80° C. for 1 h. After the reaction was completed, an aqueous solution of a polycarboxylic acid copolymer with a solid content of 30 wt % was obtained;

[0129] The molar ratio of maleic acid, itaconic acid, acrylic acid and ammonium persulfate is 1:1:1:0.1;

[0130] Carboxylated zinc oxide, a polycarboxylic acid copolymer aqueous solution, a catalyst sodium hypophosphite, and water are mixed in a mass ratio of 1:25:4:100 to obtain an anti-wrinkle finishing liquid;

[0131] The preparation of carboxylated zinc oxide is the same as that in Example 1;

[0132] Step (3): laminating the outer fabric and the inner fabric, stacking and aligning them, and sewing the outer fabric and the inner fabric with cotton sewing thread through a multi-layer fabric quilting machine to obtain a hemp-based moisture-absorbing composite wrinkle-resistant fabric.

[0133] Comparative Example 2

[0134] This comparative example discloses a method for preparing a hemp-based composite fabric, comprising the following steps:

[0135] Step (1), blending hemp fiber and cotton fiber in a mass ratio of 30:70 to obtain hemp / cotton blended yarn with a yarn count of British count 60S; mixing the hemp / cotton blended yarn with a 1 mol / L sodium hydroxide aqueous solution at a bath ratio of 1:40, activating the yarn at room temperature for 1 hour, taking it out after the activation is completed, and washing it to neutrality to obtain the activated hemp / cotton blended yarn;

[0136] The activated hemp / cotton blended yarn was mixed with the antibacterial finishing liquid at a bath ratio of 1:30, reacted at 85°C for 30 minutes, taken out after the reaction, and dried at 50°C for 48 hours to obtain the antibacterial modified hemp / cotton blended yarn;

[0137] The antibacterial finishing liquid is prepared by the following steps:

[0138] The product C and a 10 wt% sodium hypochlorite aqueous solution were mixed in a mass ratio of 1:10, chlorinated at room temperature for 1 hour, and after the chlorination was completed, the solvent water was removed by rotary evaporation, and dried at 50°C for 30 hours to obtain a chlorinated product C; the chlorinated product C, γ-chloropropyltrimethoxysilane, and ethanol were mixed in a mass ratio of 2.4:1:50, reacted at 75°C for 10 hours, and after the reaction was completed, the solvent ethanol was removed by rotary evaporation, and dried at 50°C for 10 hours to obtain an antibacterial agent; the antibacterial agent was mixed with water in a mass ratio of 1:100 to obtain an antibacterial finishing liquid;

[0139] Wherein, the preparation of product C is the same as that in Example 1;

[0140] Step (2): Weaving the antibacterial modified hemp / cotton blended yarn as the warp and the pure cotton fiber yarn as the weft to obtain a weight of 120g / m 2 Single layer fabric;

[0141] The single-layer fabric was impregnated with the anti-wrinkle finishing liquid at a bath ratio of 1:20, and was immersed for 5 minutes at room temperature, with two immersions and two rollings, and the rolling rate was 90%. After the impregnation, it was pre-dried at 80°C for 3 minutes and baked at 170°C for 3 minutes to obtain the outer layer fabric and the inner layer fabric respectively;

[0142] The anti-wrinkle finishing liquid is prepared by the following steps:

[0143] Maleic acid, itaconic acid, acrylic acid, and water were mixed and stirred, and a 30 wt % aqueous solution of ammonium persulfate was added dropwise at 80° C. in a nitrogen atmosphere for 2 h. After the addition was complete, the mixture was reacted at 80° C. for 1 h. After the reaction was completed, an aqueous solution of a polycarboxylic acid copolymer with a solid content of 30 wt % was obtained;

[0144] The molar ratio of maleic acid, itaconic acid, acrylic acid and ammonium persulfate is 1:1:1:0.1;

[0145] The polycarboxylic acid copolymer aqueous solution, the catalyst sodium hypophosphite, and water are mixed in a mass ratio of 25:4:100 to obtain an anti-wrinkle finishing liquid;

[0146] Step (3): laminating the outer fabric and the inner fabric, stacking and aligning them, and sewing the outer fabric and the inner fabric with cotton sewing thread through a multi-layer fabric quilting machine to obtain a hemp-based moisture-absorbing composite wrinkle-resistant fabric.

[0147] In the above embodiments and comparative examples:

[0148] Amination zinc oxide was prepared in-house. The preparation method included mixing γ-aminopropylmethyldiethoxysilane, nano-zinc oxide, and ethanol in a mass ratio of 0.1:0.1:15, reacting at 60°C for 1 hour, filtering the filter cake, washing it with ethanol, and drying it at 60°C for 12 hours to obtain amination zinc oxide. Nano-zinc oxide was obtained from Aladdin Biochemical Technology Co., Ltd. and had a particle size of 50 nm.

[0149] Hemp fiber comes from Liaoning Xinyi Hemp New Material Technology Development Co., Ltd., with an average fiber length of 30 mm; cotton fiber is long-staple cotton with a fiber length of 38-39 mm; the yarn count of pure cotton fiber yarn is British count 60S; biuret comes from Maclean Biochemical Technology Co., Ltd., CAS number: 108-19-0; γ-chloropropyltrimethoxysilane comes from Maclean Biochemical Technology Co., Ltd., CAS number: 2530-87-2.

[0150] Test example

[0151] The comprehensive performance tests were conducted on the hemp-based composite fabrics prepared in the examples and comparative examples. The specific test results are shown in Table 1:

[0152]

[0153] The tests of various indicators in Table 1 are based on the following standards: the antibacterial rate is determined with reference to GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method", in which Escherichia coli is selected as the bacterial species; the wrinkle recovery angle is determined with reference to GB / T3819-1997 "Determination of crease recovery of textile fabrics - Recovery angle method"; the water absorption rate is determined by GB / T21655.1-2008 "Evaluation of moisture absorption and quick-drying properties of textiles Part 1: Single combination test method".

[0154] According to the test results in Table 1, it can be seen that the hemp-based composite fabric prepared by the present invention has good moisture absorption performance, antibacterial effect and anti-wrinkle effect.

[0155] In Comparative Example 1, the hemp / cotton blended yarn was not subjected to antibacterial modification. Only carboxylated zinc oxide was used as an inorganic antibacterial component to play an antibacterial role. The antibacterial performance of the fabric was reduced. At the same time, there was a lack of interaction between the cationic group of the antibacterial agent and the anti-wrinkle component of the anti-wrinkle finishing liquid. Therefore, the antibacterial and anti-wrinkle performance of Comparative Example 1 were inferior to those of the embodiment.

[0156] Comparative Example 2 does not add carboxylated zinc oxide, lacks the effect of carboxylated zinc oxide as an inorganic antibacterial agent to improve the antibacterial properties of the fabric, and lacks the esterification reaction between carboxylated zinc oxide and the cellulose fibers of the fabric during padding, and lacks the interaction with the cationic groups on the antibacterial modified hemp / cotton blended yarn. Therefore, the antibacterial and anti-wrinkle properties of Comparative Example 2 are not as good as those of the embodiment.

[0157] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a hemp-based moisture-absorbing composite wrinkle-resistant fabric, characterized in that: The following steps are involved: Step (1), mixing the activated hemp / cotton blended yarn with an antibacterial finishing liquid, reacting, taking out after the reaction, and drying to obtain the antibacterial modified hemp / cotton blended yarn; The antibacterial finishing liquid is prepared by the following steps: S11, mixing p-hydroxybenzaldehyde, biuret, and a hydrogen chloride aqueous solution, reacting, and purifying after the reaction to obtain product A; S12, mixing succinic anhydride, 3-dimethylamino-1-propanol, and tetrahydrofuran, reacting, adding 2-chloro-4,6-dimethoxy-1,3,5-triazine and N-methylmorpholine, stirring, filtering, collecting the filter cake, and recrystallizing to obtain product B; S13, mixing product A, product B, and dichloromethane, adding catalysts of palladium acetate and potassium phosphate, and reacting. After the reaction is completed, filtering, rotary evaporation, and recrystallization are performed to obtain product C; S14, mixing product C and a 10 wt% aqueous sodium hypochlorite solution, chlorinating, and after the chlorination is completed, rotary evaporation, and drying to obtain a chlorinated product C; mixing the chlorinated product C, γ-chloropropyltrimethoxysilane, and ethanol, reacting, after the reaction is completed, rotary evaporation, and drying to obtain an antibacterial agent; mixing the antibacterial agent with water to obtain an antibacterial finishing solution; Step (2), using the antibacterial modified hemp / cotton blended yarn as the warp and the pure cotton fiber yarn as the weft to weave a single-layer fabric; Mixing carboxylated zinc oxide, a polycarboxylic acid copolymer aqueous solution, a catalyst sodium hypophosphite, and water to obtain an anti-wrinkle finishing liquid; The single-layer fabric is dipped into the anti-wrinkle finishing liquid, and after the dipping is completed, it is dried to obtain the outer layer fabric and the inner layer fabric respectively; Step (3): compounding the outer layer fabric with the inner layer fabric to obtain a hemp-based moisture-absorbing composite wrinkle-resistant fabric.

2. The method for preparing a moisture-absorbing composite wrinkle-resistant fabric based on hemp according to claim 1, characterized in that: The activated hemp / cotton blended yarn in step (1) is prepared by the following steps: Hemp fiber and cotton fiber are blended to obtain hemp / cotton blended yarn; the hemp / cotton blended yarn is mixed with a sodium hydroxide aqueous solution and activated, and after the activation is completed, the yarn is taken out and washed to obtain the activated hemp / cotton blended yarn.

3. The method for preparing a moisture-absorbing composite wrinkle-resistant fabric based on hemp according to claim 2, characterized in that: When preparing the activated hemp / cotton blended yarn in step (1), the mass ratio of hemp fiber to cotton fiber is 20-30:70-80; the yarn count of the hemp / cotton blended yarn is 60S in British standard; the bath ratio of the hemp / cotton blended yarn to the sodium hydroxide aqueous solution is 1:40-50, and the sodium hydroxide aqueous solution is a 1 mol / L sodium hydroxide aqueous solution; and the activation conditions are: activation at room temperature for 1-1.5 hours.

4. The method for preparing a moisture-absorbing composite wrinkle-resistant fabric based on hemp according to claim 1, characterized in that: In the step (1), the bath ratio of the activated hemp / cotton blended yarn to the antibacterial finishing liquid is 1:30-40; and the reaction conditions are: reacting at a temperature of 85-90° C. for 20-30 minutes.

5. The method for preparing a moisture-absorbing composite wrinkle-resistant fabric based on hemp according to claim 1, characterized in that: When preparing the antibacterial finishing liquid in step (1): In S11, the mass ratio of p-hydroxybenzaldehyde, biuret, and hydrogen chloride aqueous solution is 4.8-5:4.2-4.5:38-40, and the hydrogen chloride aqueous solution is a 37 wt % hydrogen chloride aqueous solution; the reaction conditions are: reaction at room temperature for 22-26 hours; In S12, the mass ratio of succinic anhydride, 3-dimethylamino-1-propanol, tetrahydrofuran, 2-chloro-4,6-dimethoxy-1,3,5-triazine, and N-methylmorpholine is 3:3-3.1:120-150:4.5-4.6:2.5-2.6; the reaction conditions are: reaction at 75-85°C for 1-1.5 hours; and stirring conditions are: stirring at 0°C for 1 hour. In S13, the mass ratio of product A, product B, dichloromethane, palladium acetate, and potassium phosphate is 0.7-0.8:0.9-1:15-20:0.01-0.02:0.01-0.02; the reaction conditions are: reaction at 70-80°C for 1-2h; In S14: the mass ratio of product C and 10wt% sodium hypochlorite aqueous solution is 1:10; the chlorination conditions are: chlorination at room temperature for 1-1.5h; the mass ratio of chlorinated product C, γ-chloropropyltrimethoxysilane, and ethanol is 2.4-2.5:1-1.3:50-60; the reaction conditions are: reaction at a temperature of 75-85°C for 8-10h; the mass ratio of antibacterial agent to water is 1-1.5:

100.

6. The method for preparing a moisture-absorbing composite wrinkle-resistant fabric based on hemp according to claim 1, characterized in that: In step (2): the weight of the single-layer fabric is 120-140g / m 2 The bath ratio of single-layer fabric to anti-wrinkle finishing liquid is 1:20-30; the padding conditions are: dipping at room temperature for 5-8 minutes, two dippings and two paddings, and the padding rate is 90-100%; the drying conditions are: pre-drying at 80-85℃ for 2-3 minutes, and baking at 170-180℃ for 2-3 minutes.

7. The method for preparing a moisture-absorbing composite wrinkle-resistant fabric based on hemp according to claim 1, characterized in that: The carboxylated zinc oxide in step (2) is prepared by the following steps: The aminated zinc oxide is mixed with N,N-dimethylformamide, ultrasonically dispersed, succinic anhydride is added, reacted, and after the reaction is completed, filtered, washed, and dried to obtain carboxylated zinc oxide; The polycarboxylic acid copolymer aqueous solution in step (2) is prepared by the following steps: Maleic acid, itaconic acid, acrylic acid and water are mixed and stirred, and an aqueous ammonium persulfate solution is added dropwise. After the addition is complete, the mixture is reacted. After the reaction is completed, an aqueous solution of a polycarboxylic acid copolymer is obtained.

8. The method for preparing a moisture-absorbing composite wrinkle-resistant fabric based on hemp according to claim 7, characterized in that: When preparing carboxylated zinc oxide in step (2): The mass ratio of amination zinc oxide, N,N-dimethylformamide, and succinic anhydride is 0.2-0.25:70-80:0.7; the reaction conditions are: a rotation speed of 500-600 r / min, and a reaction at room temperature for 20-24 hours; When preparing the polycarboxylic acid copolymer aqueous solution in step (2), the molar ratio of maleic acid, itaconic acid, acrylic acid, and ammonium persulfate is 1:1:1:0.1-0.12; the ammonium persulfate aqueous solution is a 30 wt% ammonium persulfate aqueous solution, and the dripping conditions are: dripping for 2-2.5 hours at a temperature of 80-85° C. in a nitrogen atmosphere; the reaction conditions are: reacting at a temperature of 80-85° C. for 0.5-1 hour; and the solid content of the polycarboxylic acid copolymer aqueous solution is 30 wt%.

9. The method for preparing a moisture-absorbing composite wrinkle-resistant fabric based on hemp according to claim 1, characterized in that: When preparing the anti-wrinkle finishing liquid in step (2): The mass ratio of carboxylated zinc oxide, polycarboxylic acid copolymer aqueous solution, catalyst sodium hypophosphite and water is 1-1.5:25-30:4-5:

100.

10. A hemp-based moisture-absorbing composite anti-wrinkle fabric prepared by the method for preparing a hemp-based moisture-absorbing composite anti-wrinkle fabric according to any one of claims 1 to 9.

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