Cotton fabric anti-ultraviolet anti-wrinkle finishing agent and preparation method thereof

Abstract

The invention provides a cotton fabric anti-ultraviolet and anti-wrinkle finishing agent and a preparation method thereof, and relates to the technical field of textile assistants. The anti-ultraviolet and anti-wrinkle finishing agent for the cotton fabric comprises a first finishing agent and a second finishing agent, wherein the first finishing agent is prepared from the following raw materials in parts by weight: 16 to 22 parts of modified 2D resin, 3 to 8 parts of hydroxyethyl chitosan-polylactic acid copolymer, 2.5 to 3.5 parts of magnesium chloride hexahydrate and 100 parts of water; the second finishing agent is prepared from the following raw materials in parts by weight: 8 to 15 parts of carboxyl-terminated hyperbranched polyester, 5 to 10 parts of bis-PEG-18 methyl ether dimethyl silane and 100 parts of water. The finishing agent not only can improve the ultraviolet protection coefficient and crease resistance of the cotton fabric, but also is good in washing resistance, still keeps better ultraviolet resistance and crease resistance after being washed for multiple times, and reduces the influence on the strength and hand feeling of the cotton fabric.

Description

Technical Field

[0001] This application relates to the field of textile auxiliaries technology, and in particular to an anti-UV and anti-wrinkle finishing agent for cotton fabrics and its preparation method. Background Technology

[0002] Cotton fabrics are soft, breathable, and comfortable to wear, making them one of the most popular fabrics. However, cotton fabrics have inherent drawbacks such as wrinkling easily and the need for ironing after washing. Furthermore, with increasing health and safety awareness in recent years, people are demanding higher levels of comfort and functionality from textiles, making multi-functionality a growing trend in the industry. Therefore, endowing cotton fabrics with UV resistance and wrinkle resistance plays a crucial role in enhancing their practical value.

[0003] Currently, common methods for anti-wrinkle and UV-resistant finishing of cotton fabrics involve coating, impregnation, and chemical deposition to form a coating of functional additives on the surface of the cotton fabric. However, due to the lack of strong chemical bonds between the coating and the cotton fabric surface, the wash resistance is poor. The current trend is to indirectly connect the additives to the surface of the cotton fabric through surface modification, using substances that can chemically crosslink with the hydroxyl groups on the cotton fabric surface as an intermediary. For example, patent CN119121616A discloses that the fabric surface is treated with 4-amino-3-nitrobenzyl alcohol, sodium nitrite, and glucose, and then further processed with modified nano-titanium dioxide and 1-chloromethyl-3-trifluoromethylbenzene to obtain an anti-UV and anti-wrinkle fabric. However, this process is too complex, the number of washes required to test the UV resistance is insufficient (only the difference after 10 washes is tested), and the wrinkle recovery angle is still relatively low. For example, patent CN104018339A discloses that the anti-wrinkle finishing agent working solution is prepared by using 2D resin or etherified 2D resin as the anti-wrinkle finishing agent and adding various auxiliaries. Fabrics treated with this working solution have good anti-wrinkle performance and solve the defect of poor hand feel after treatment. However, the problem of reduced strength has not been well solved (the strength retention rate is only 79% at most).

[0004] Therefore, there is still a lack of a UV-resistant and wrinkle-resistant finishing agent that is water-resistant, strong, and retains its hand feel. Summary of the Invention

[0005] The purpose of this application is to address the shortcomings of the prior art by providing a UV-resistant and wrinkle-resistant finishing agent for cotton fabrics and its preparation method. This finishing agent not only improves the UV protection coefficient and wrinkle resistance of cotton fabrics, but also has good water washability and maintains good UV resistance and wrinkle resistance after multiple washes. It also solves the defects of poor hand feel and reduced strength of cotton fabrics after finishing.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: An anti-UV and anti-wrinkle finishing agent for cotton fabrics, comprising a first finishing agent and a second finishing agent: wherein the first finishing agent comprises the following raw materials in parts by weight: 16-22 parts of modified 2D resin, 3-8 parts of hydroxyethyl chitosan-polylactic acid copolymer, 2.5-3.5 parts of magnesium chloride hexahydrate, and 100 parts of water; The second finishing agent comprises the following raw materials in parts by weight: 8-15 parts of carboxyl-terminated hyperbranched polyester, 5-10 parts of bis-PEG-18 methyl ether dimethylsilane, and 100 parts of water; The modified 2D resin is obtained by modifying 2D resin with benzophenone-based UV-resistant additives.

[0007] Preferably, the first finishing agent comprises the following raw materials in parts by weight: 20 parts modified 2D resin, 5 parts hydroxyethyl chitosan-polylactic acid copolymer, 3 parts magnesium chloride hexahydrate, and 100 parts water; The second finishing agent comprises the following raw materials in parts by weight: 10 parts of carboxyl-terminated hyperbranched polyester, 8 parts of bis-PEG-18 methyl ether dimethylsilane, and 100 parts of water.

[0008] The first finishing agent of this application uses modified 2D resin as the main material and adds a certain amount of hydroxyethyl chitosan-polylactic acid copolymer. The modified 2D resin can be well fixed on the fabric surface, improving the fabric's wrinkle resistance and UV resistance, while also having good washability, allowing the fabric to maintain good UV resistance even after multiple washes. The second finishing agent uses carboxyl-terminated hyperbranched polyester and bis-PEG-18 methyl ether dimethylsilane as the main materials, which have good adhesion to the first finishing layer, thus giving the overall material excellent washability.

[0009] Furthermore, the modified 2D resin is prepared by the following method: (1) Mix urea, glyoxal and formaldehyde, and heat them at pH 6.0-7.5 and 40-60℃ to obtain a 2D resin solution; (2) Distill the 2D resin solution obtained in step (1) under reduced pressure until the water content is 8-12%; (3) Add alcohol and benzophenone UV-resistant additives, adjust the pH to 1.0 with acid, continue the reaction at 50-60℃ for 1-3 hours, adjust the pH to 3.0-4.0 with alkali, and cool to room temperature to obtain the product.

[0010] Preferably, in the above-mentioned modified 2D resin preparation step (1), the molar ratio of urea, glyoxal and formaldehyde is 1:1:(1.8~2), based on dry weight; The formaldehyde and glyoxal mentioned above are both added in the form of formaldehyde aqueous solution; wherein, the mass fraction of the formaldehyde aqueous solution is not less than 30%, for example, it can be 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40% or even higher; the mass fraction of the glyoxal aqueous solution is not less than 40%, for example, it can be 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50% or even higher; The heating reaction time is 4 to 12 hours.

[0011] Preferably, in step (2) of the above-mentioned modified 2D resin preparation, the temperature of vacuum distillation is 50-60°C.

[0012] Preferably, in the above-mentioned modified 2D resin preparation step (3), the alcohol is any one or a combination of methanol, ethanol, isopropanol, and tert-butanol; the amount added is 0.3 to 0.5 times the mass of the 2D resin solution after vacuum distillation in step (2); The benzophenone-based UV-resistant additive is any one or a combination of several of 2,4-dihydroxybenzophenone, 2,3,4-trihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, and 2-hydroxy-4-n-octyloxybenzophenone; the amount added is 5-8% of the mass of the 2D resin solution after vacuum distillation in step (2); The acid mentioned is any one or a combination of several of hydrochloric acid, sulfuric acid, phosphoric acid, and nitric acid; The alkali is any one or a combination of several of sodium hydroxide, potassium hydroxide, ammonia, triethylamine, and triethanolamine.

[0013] This application utilizes the hydroxymethylation reaction of formaldehyde, glyoxal, and urea to generate a 2D resin. Then, the 2D resin undergoes a partial etherification reaction with a benzophenone-based UV-resistant additive to prepare a modified 2D resin. The modified 2D resin can fix the UV-resistant substances onto the fabric surface. In addition, the modified 2D resin also contains a certain amount of alcohol, which helps reduce the reversible release of formaldehyde and also acts as a solubilizer for benzophenone-based substances. Through the above-mentioned effects of the modified 2D resin, wrinkle-resistant and UV-resistant finishing of cotton fabrics can be achieved, and the wash resistance is significantly improved, allowing the fabric to retain excellent wrinkle-resistant and UV-resistant properties even after multiple washes.

[0014] Furthermore, the preparation method of the hydroxyethyl chitosan-polylactic acid copolymer includes the following steps: Hydroxyethyl chitosan, D,L-lactide and catalyst are mixed and stirred overnight at 130-135°C. After cooling, sufficient acetone is added and stirred evenly. The mixture is then filtered and dried to obtain the final product.

[0015] Preferably, in the preparation process of the above-mentioned hydroxyethyl chitosan-polylactic acid copolymer, the degree of deacetylation of the hydroxyethyl chitosan is 80-90%, the molecular weight is 50,000-80,000, and the degree of hydroxyethyl substitution is 50-68%; the hydroxyethyl chitosan can be commercially available or prepared by a method well known to those skilled in the art, for example, it can be obtained by reacting chitosan with chloroethanol. The mass ratio of hydroxyethyl chitosan to D,L-lactide is 1:(5-8). The catalyst is a catalyst well known in the art, such as an organotin catalyst, preferably stannous octoate, dibutyltin dilaurate, etc. The catalyst dosage is 0.5–3% of the mass of hydroxyethyl chitosan; In the preparation of the above-mentioned hydroxyethyl chitosan-polylactic acid copolymer, the reaction process is carried out under vacuum conditions and the stirring speed is 300-800 r / min.

[0016] While modified 2D resins can impart good wash resistance, UV resistance, and wrinkle resistance to cotton fabrics, they can easily lead to a stiffer hand feel and reduced fabric strength. Studies have found that adding a certain amount of hydroxyethyl chitosan-polylactic acid copolymer to the finishing agent can reduce the strength reduction problem compared to chitosan or polylactic acid alone. Furthermore, the hydroxyethyl chitosan-polylactic acid copolymer has good bonding strength with the fabric and can form a certain cross-link with the modified 2D resin, thereby further increasing the adhesion of the finishing layer to the fabric surface and further improving wash resistance. However, it is important to control the ratio of hydroxyethyl chitosan and polylactic acid in the copolymer (i.e., the ratio of hydroxyethyl chitosan to D,L-lactide), as well as the degree of deacetylation and hydroxyethyl substitution of hydroxyethyl chitosan. Maintaining the active groups and chain segments in the copolymer within a certain proportion is crucial to prevent the finishing solution from failing to form a uniform, continuous, and firmly bonded finishing layer on the fabric surface, which would instead lead to decreased water resistance and affect the retention of fabric strength.

[0017] Furthermore, the molecular weight of the terminal carboxyl hyperbranched polyester in the second finishing agent is 2000-5000.

[0018] Carboxyl-terminated hyperbranched polyester and bis-PEG-18 methyl ether dimethylsilane are materials well known to those skilled in the art, and can be obtained directly from commercial purchases or prepared by existing methods.

[0019] The carboxyl-terminated hyperbranched polyester and bis-PEG-18 methyl ether dimethyl silane in the second finishing agent of this application interact with the modified 2D resin and hydroxyethyl chitosan-polylactic acid copolymer in the first finishing agent, so that the finishing layer and the cotton fabric have a strong bond and improve the wash resistance. The carboxyl-terminated hyperbranched polyester and bis-PEG-18 methyl ether dimethyl silane can form a flexible surface layer, which can fill the gaps in the bottom layer and neutralize the stiffness caused by rigidity, thereby further improving the soft hand feel and strength of the finished cotton fabric, and also improving the abrasion resistance of the fabric.

[0020] According to another aspect of this application, a method for preparing an anti-UV and anti-wrinkle finishing agent for cotton fabrics is provided, comprising the following steps: (1) The modified 2D resin, hydroxyethyl chitosan-polylactic acid copolymer, magnesium chloride hexahydrate and water are mixed evenly to obtain the first finishing agent; (2) The carboxyl-terminated hyperbranched polyester, bis-PEG-18 methyl ether dimethyl silane and water are mixed evenly to obtain the second finishing agent.

[0021] According to another aspect of this application, a method for treating cotton fabrics with the aforementioned UV-resistant and wrinkle-resistant finishing agent is provided, comprising the following steps: S1. Immerse the cotton fabric in the first finishing agent at 35-45℃ for 10-30 minutes, and then pre-dry it at 100-110℃ for 3-5 minutes. S2. Then, immerse the product in a second finishing agent at 35-45℃ for 5-10 minutes, with a liquid retention rate of 80-85%; then pre-dry at 110-115℃ for 1-2 minutes, and finally bake at 150-155℃ for 3-4 minutes to obtain the final product.

[0022] The free formaldehyde content of the cotton fabric products analyzed in this application meets the requirements of GB18401-2003 and will not affect the health of the wearer.

[0023] Compared with the prior art, this application has the following beneficial effects: 1. The anti-UV and anti-wrinkle finishing agent for cotton fabrics provided in this application first treats the cotton fabric with a first finishing agent and then treats it with a second finishing agent. The treated cotton fabric has a high UV protection coefficient, anti-wrinkle ability, and good washability. After multiple washes, it still maintains good anti-UV and anti-wrinkle properties and does not affect the strength and hand feel of the fabric.

[0024] 2. In the first finishing agent of this application, a multi-hydroxyl 2D resin reacts with a benzophenone-based UV-resistant additive. The other hydroxyl groups of the 2D resin can be etherified and linked to the hydroxyl groups on the fabric's cellulose, thereby chemically bonding the 2D resin and the UV-resistant substance to the surface of the cotton fabric. This significantly improves the wash resistance, allowing the fabric to retain excellent wrinkle resistance and UV resistance even after multiple washes. Adding a certain amount of hydroxyethyl chitosan-polylactic acid copolymer to the first finishing agent can reduce the problem of strength loss and further improve the wash resistance.

[0025] 3. This application uses carboxyl-terminated hyperbranched polyester and bis-PEG-18 methyl ether dimethyl silane as the second finishing agent, which interact with the modified 2D resin and hydroxyethyl chitosan-polylactic acid copolymer in the first finishing agent to make the finishing layer and cotton fabric have a strong bond, improve the wash resistance, improve the softness and strength of the finished cotton fabric, and enhance the abrasion resistance of the fabric.

[0026] 4. Cotton fabrics treated with the UV-resistant and wrinkle-resistant finishing agent of this application have a strength retention rate of over 86%, and after 30 washes, the UPF value is still higher than 60.0 and the RAM remains above 230°, demonstrating excellent wash resistance. Detailed Implementation

[0027] The following non-limiting embodiments are intended to enable those skilled in the art to gain a more comprehensive understanding of this application, but do not limit this application in any way. The following content is merely an exemplary description of the scope of protection claimed in this application, and those skilled in the art can make various changes and modifications to the invention based on the disclosed content, which should also fall within the scope of protection claimed in this application.

[0028] Unless otherwise specified, all chemical reagents used in the embodiments of this application were obtained through conventional commercial channels. Among them, the carboxyl-terminated hyperbranched polyester was purchased from Nantong Zhonghe Chemical New Materials Co., Ltd., and the bis-PEG-18 methyl ether dimethylsilane was purchased from Shanghai Koraman Reagent Co., Ltd.

[0029] The present application will be further described below by way of specific embodiments.

[0030] Example 1 A UV-resistant and wrinkle-resistant finishing agent for cotton fabrics, comprising a first finishing agent and a second finishing agent: The first finishing agent comprises the following raw materials in parts by weight: 16 parts modified 2D resin, 8 parts hydroxyethyl chitosan-polylactic acid copolymer, 2.5 parts magnesium chloride hexahydrate, and 100 parts water; The second finishing agent comprises the following raw materials in parts by weight: 8 parts of carboxyl-terminated hyperbranched polyester (molecular weight 2000), 10 parts of bis-PEG-18 methyl ether dimethylsilane, and 100 parts of water. The modified 2D resin was prepared by the following method: Urea, glyoxal, and formaldehyde were mixed in a molar ratio of 1:1:1.8. The mixture was then reacted at 40°C for 12 hours, maintaining the pH at 6.0. The solution was then distilled under reduced pressure at 50°C until the water content reached 8%, yielding a 2D resin solution. Ethanol (0.3 times the mass of the 2D resin solution) and 2,4-dihydroxybenzophenone (5% of the mass of the 2D resin solution) were added. The pH was adjusted to 1.0 with hydrochloric acid, and the reaction continued at 50°C for 1 hour. The pH was then adjusted back to 3.0 with sodium hydroxide, and the mixture was cooled to room temperature to obtain the final product.

[0031] The hydroxyethyl chitosan-polylactic acid copolymer was prepared by the following method: hydroxyethyl chitosan (80% degree of deacetylation, 50,000 molecular weight, and 50% degree of hydroxyethyl substitution) and D,L-lactide were mixed at a mass ratio of 1:5. 0.5% of stannous octoate by mass of hydroxyethyl chitosan was added, and the mixture was stirred and reacted overnight at 130°C. After cooling, sufficient acetone was added and stirred evenly. The mixture was then filtered and dried to obtain the final product.

[0032] Example 2 A UV-resistant and wrinkle-resistant finishing agent for cotton fabrics, comprising a first finishing agent and a second finishing agent: The first finishing agent contains the following raw materials in parts by weight: 20 parts modified 2D resin, 5 parts hydroxyethyl chitosan-polylactic acid copolymer, 3 parts magnesium chloride hexahydrate, and 100 parts water; The second finishing agent comprises the following raw materials in parts by weight: 10 parts of carboxyl-terminated hyperbranched polyester (molecular weight 5000), 8 parts of bis-PEG-18 methyl ether dimethylsilane, and 100 parts of water. The modified 2D resin was prepared by the following method: Urea, glyoxal, and formaldehyde were mixed in a molar ratio of 1:1:2. The mixture was then reacted at 60°C for 4 hours, maintaining the pH at 6.5. The solution was then distilled under reduced pressure at 60°C until the water content reached 12%, yielding a 2D resin solution. Propylene glycol (0.5 times the mass of the 2D resin solution) and 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid (8% of the mass of the 2D resin solution) were added. The pH was adjusted to 1.0 with nitric acid, and the reaction continued at 60°C for 1 hour. The pH was then adjusted back to 4.0 with triethylamine, and the mixture was cooled to room temperature to obtain the final product.

[0033] The hydroxyethyl chitosan-polylactic acid copolymer was prepared by the following method: hydroxyethyl chitosan (90% degree of deacetylation, 80,000 molecular weight, and 68% degree of hydroxyethyl substitution) and D,L-lactide were mixed at a mass ratio of 1:8, and 0.5% stannous octoate by mass of hydroxyethyl chitosan was added. The mixture was stirred and reacted overnight at 135°C, cooled, and then added with sufficient acetone and stirred until homogeneous. The mixture was then filtered and dried to obtain the final product.

[0034] Example 3 A UV-resistant and wrinkle-resistant finishing agent for cotton fabrics, comprising a first finishing agent and a second finishing agent: The first finishing agent comprises the following raw materials in parts by weight: 22 parts modified 2D resin, 3 parts hydroxyethyl chitosan-polylactic acid copolymer, 3.5 parts magnesium chloride hexahydrate, and 100 parts water; The second finishing agent comprises the following raw materials in parts by weight: 15 parts of carboxyl-terminated hyperbranched polyester (molecular weight 5000), 5 parts of bis-PEG-18 methyl ether dimethylsilane, and 100 parts of water. The modified 2D resin was prepared by the following method: Urea, glyoxal, and formaldehyde were mixed in a molar ratio of 1:1:2. The mixture was then reacted at 60°C for 4 hours, maintaining the pH at 6.5. The solution was then distilled under reduced pressure at 60°C until the water content reached 12%, yielding a 2D resin solution. Propylene glycol (0.5 times the mass of the 2D resin solution) and 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid (8% of the mass of the 2D resin solution) were added. The pH was adjusted to 1.0 with nitric acid, and the reaction continued at 60°C for 1 hour. The pH was then adjusted back to 4.0 with triethylamine, and the mixture was cooled to room temperature to obtain the final product.

[0035] The hydroxyethyl chitosan-polylactic acid copolymer was prepared by the following method: hydroxyethyl chitosan (degree of deacetylation 90%, molecular weight 80,000, degree of hydroxyethyl substitution 68%) and D,L-lactide were mixed at a mass ratio of 1:8, and 3% stannous octoate by mass of hydroxyethyl chitosan was added. The mixture was stirred and reacted overnight at 135°C, cooled, and then added with sufficient acetone and stirred evenly. The mixture was then filtered and dried to obtain the final product.

[0036] Example 4 The difference from Example 2 is that in the preparation of the hydroxyethyl chitosan-polylactic acid copolymer, the mass ratio of hydroxyethyl chitosan to D,L-lactide is 1:2.

[0037] Example 5 The difference from Example 2 is that in the preparation of the hydroxyethyl chitosan-polylactic acid copolymer, the mass ratio of hydroxyethyl chitosan to D,L-lactide is 1:10.

[0038] Example 6 The difference from Example 2 is that the degree of deacetylation of hydroxyethyl chitosan is 95% during the preparation of the hydroxyethyl chitosan-polylactic acid copolymer.

[0039] Example 7 The difference from Example 2 is that the degree of hydroxyethyl substitution of hydroxyethyl chitosan is 80% in the preparation of the hydroxyethyl chitosan-polylactic acid copolymer.

[0040] Example 8 The difference from Example 2 is that the molecular weight of the carboxyl-terminated hyperbranched polyester is 10,000.

[0041] Comparative Example 1 The difference from Example 2 is that the modified 2D resin in the first finishing agent is prepared by the following method: adding propylene glycol (0.5 times the mass of the 2D resin solution) and 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid (8% of the mass of the 2D resin solution) to the 2D resin solution (preparation method is the same as in Example 2), and adjusting the pH value to 4.0, thus obtaining the resin.

[0042] Comparative Example 2 The difference from Example 2 is that propylene glycol was not added during the preparation of the modified 2D resin in the first finishing agent.

[0043] Comparative Example 3 The difference from Example 2 is that hydroxyethyl chitosan-polylactic acid copolymer was not added to the first finishing agent.

[0044] Comparative Example 4 The difference from Example 2 is that the hydroxyethyl chitosan-polylactic acid copolymer in the first finishing agent is replaced with hydroxyethyl chitosan and polylactic acid in a mass ratio of 1:8, while the total amount remains unchanged.

[0045] Comparative Example 5 The difference from Example 2 is that the hydroxyethyl chitosan-polylactic acid copolymer in the first finishing agent is replaced with an equal amount of hydroxyethyl chitosan.

[0046] Comparative Example 6 The difference from Example 2 is that bis-PEG-18 methyl ether dimethylsilane was not added to the second finishing agent.

[0047] Comparative Example 7 The difference from Example 2 is that the UV-resistant and wrinkle-resistant finishing agent for cotton fabrics is only the first finishing agent.

[0048] Test case A cotton fabric with a density (warp × weft, roots / 10cm) of 114 × 70 was used as a sample (its performance parameters are shown in Table 1 below). The fabric was treated with the UV-resistant and wrinkle-resistant finishing agents used in the above examples and comparative examples. The specific methods are as follows: S1. Immerse the cotton fabric in the first finishing agent at 35°C for 30 minutes, then remove it and pre-dry it at 100°C for 3 minutes. S2. Then, immerse it in the second finishing agent at 35°C for 10 minutes, with a liquid retention rate of 85%. Then, pre-dry it at 110°C for 1 minute, and finally bake it at 150°C for 3 minutes to obtain the final product.

[0049] A conventional UV-resistant process was used as a control group. Specifically, 20 parts of 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 3 parts of magnesium chloride hexahydrate, and 100 parts of water were mixed and stirred until homogeneous to obtain the finishing agent. Cotton fabric was immersed in this finishing agent (at 35°C) for 10 minutes, with a liquid retention rate of 85%. Then, it was pre-dried at 110°C for 1 minute and finally baked at 150°C for 3 minutes to obtain the final product.

[0050] The following tests were performed on the cotton fabrics before and after the above treatment: Ultraviolet Protection Factor (UPF): Tested according to GB / T 18830-2009; Wrinkle recovery angle RAM: Tested according to GB / T3819-1997; Strength: The latitudinal breaking strength was tested and the strength retention rate was calculated according to ASTM D5034-2009; The formula for calculating the latitudinal fracture strength retention rate is: latitudinal fracture strength retention rate = (latitudinal fracture strength after treatment / initial latitudinal fracture strength) × 100%; Abrasion resistance: The number of abrasion cycles of cotton fabrics is tested according to GB / T21196.2-2007 standard. The higher the number of abrasion cycles, the better the abrasion resistance. Softness test: Two methods were used for testing: hand touch and DCP-RRY1000 computer-controlled softness tester. The hand touch method used 6 people to grade and score the fabric, and the average value was taken. The more "+" signs, the softer the fabric felt, and vice versa (this evaluation method is a recognized and feasible test method in the textile industry). The LLY-01B electronic stiffness tester was used to test the radial bending stiffness. The smaller the value, the easier the fabric is to bend and the better the softness.

[0051] The test results of the finished cotton fabrics are shown in Tables 2 and 3 below.

[0052] Table 1. Initial properties of cotton fabrics

[0053] Table 2. Water wash resistance

[0054] Table 3. Retention rate of latitudinal breaking strength, abrasion resistance and flexibility

[0055] As shown in the table, compared with the control example and the untreated cotton fabric, the cotton fabric treated with the UV-resistant and wrinkle-resistant finishing agent provided in this application has an excellent UV protection factor. After 30 washes, the UPF value is still higher than 60.0, and the wrinkle recovery angle of the fabric is significantly improved, showing excellent wash resistance, UV resistance and wrinkle resistance. In addition, the treated cotton fabric has increased strength retention, good abrasion resistance and good hand softness, which means that the cotton fabric treated with the UV-resistant and wrinkle-resistant finishing agent provided in this application has better strength retention, can maintain a soft hand feel, and also endows excellent abrasion resistance, making up for the defects of existing UV-resistant and wrinkle-resistant finishing auxiliaries.

[0056] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, this application is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from the scope of this application should be within the protection scope of this application.

Claims

1. A UV-resistant and wrinkle-resistant finishing agent for cotton fabrics, characterized in that, It comprises a first finishing agent and a second finishing agent; wherein the first finishing agent comprises the following raw materials in parts by weight: 16-22 parts of modified 2D resin, 3-8 parts of hydroxyethyl chitosan-polylactic acid copolymer, 2.5-3.5 parts of magnesium chloride hexahydrate, and 100 parts of water; The second finishing agent comprises the following raw materials in parts by weight: 8-15 parts of carboxyl-terminated hyperbranched polyester, 5-10 parts of bis-PEG-18 methyl ether dimethylsilane, and 100 parts of water; The modified 2D resin is obtained by modifying 2D resin with benzophenone-based UV-resistant additives.

2. The UV-resistant and wrinkle-resistant finishing agent for cotton fabrics according to claim 1, characterized in that, The first finishing agent comprises the following raw materials in parts by weight: 20 parts modified 2D resin, 5 parts hydroxyethyl chitosan-polylactic acid copolymer, 3 parts magnesium chloride hexahydrate, and 100 parts water; The second finishing agent comprises the following raw materials in parts by weight: 10 parts of carboxyl-terminated hyperbranched polyester, 8 parts of bis-PEG-18 methyl ether dimethylsilane, and 100 parts of water.

3. The UV-resistant and wrinkle-resistant finishing agent for cotton fabrics according to claim 1, characterized in that, The modified 2D resin was prepared by the following method: (1) Urea, glyoxal and formaldehyde are mixed and heated to react, resulting in a 2D resin solution; (2) Distill the 2D resin solution obtained in step (1) under reduced pressure until the water content is 8-12%; (3) Add alcohol and benzophenone-based UV stabilizers, adjust the pH to 1.0 with acid, continue the reaction for 1-3 hours, adjust the pH to 3.0-4.0 with alkali, and cool to room temperature to obtain the final product.

4. The UV-resistant and wrinkle-resistant finishing agent for cotton fabrics according to claim 3, characterized in that, In step (1), the molar ratio of urea, glyoxal and formaldehyde is 1:1:(1.8-2).

5. The UV-resistant and wrinkle-resistant finishing agent for cotton fabrics according to claim 3, characterized in that, In step (3), the benzophenone-based UV-resistant additive is any one or a combination of several of 2,4-dihydroxybenzophenone, 2,3,4-trihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, and 2-hydroxy-4-n-octyloxybenzophenone; The amount of benzophenone-based UV-resistant additive added is 5-8% of the mass of the 2D resin solution after vacuum distillation in step (2).

6. The UV-resistant and wrinkle-resistant finishing agent for cotton fabrics according to claim 1, characterized in that, The preparation method of the hydroxyethyl chitosan-polylactic acid copolymer includes the following steps: Hydroxyethyl chitosan, D,L-lactide and catalyst are mixed and stirred overnight at 130-135°C. After cooling, acetone is added and stirred evenly. The mixture is then filtered and dried to obtain the final product.

7. The UV-resistant and wrinkle-resistant finishing agent for cotton fabrics according to claim 6, characterized in that, The hydroxyethyl chitosan has a degree of deacetylation of 80-90%, a molecular weight of 50,000-80,000, and a degree of hydroxyethyl substitution of 50-68%.

8. The UV-resistant and wrinkle-resistant finishing agent for cotton fabrics according to claim 6, characterized in that, The mass ratio of hydroxyethyl chitosan to D,L-lactide is 1:(5-8).

9. The UV-resistant and wrinkle-resistant finishing agent for cotton fabrics according to claim 1, characterized in that, The molecular weight of carboxyl-terminated hyperbranched polyesters ranges from 2000 to 5000.

10. A method for preparing the UV-resistant and wrinkle-resistant finishing agent for cotton fabrics according to any one of claims 1-9, characterized in that, Includes the following steps: (1) The modified 2D resin, hydroxyethyl chitosan-polylactic acid copolymer, magnesium chloride hexahydrate and water are mixed evenly to obtain the first finishing agent; (2) The carboxyl-terminated hyperbranched polyester, bis-PEG-18 methyl ether dimethyl silane and water are mixed evenly to obtain the second finishing agent.

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