An elastic and abrasion-resistant linen fabric and its preparation method

Abstract

This invention provides an elastic and abrasion-resistant linen fabric and its preparation method, belonging to the field of fiber textile technology. The method includes the following steps: S1, Linen fiber pretreatment: Linen fibers are first soaked in a sulfuric acid aqueous solution, and then dispersed in a modified carboxymethyl cellulose aqueous solution to obtain pretreated linen fibers; S2, Preparation of core-spun yarn: Polyamide 66 fibers and pretreated linen fibers are blended, with linen fibers as the inner core yarn and polyamide 66 fibers as the outer layer yarn, to obtain core-spun yarn; S3, Preparation of reinforcing core-spun yarn: The core-spun yarn is immersed in a reinforcing solution to obtain reinforced core-spun yarn; S4, Yarn making and weaving: After twisting the reinforced core-spun yarn, it is woven on an air-jet loom to finally obtain the elastic and abrasion-resistant linen fabric. This invention solves the problems of low resilience and poor abrasion resistance of linen fibers, expanding the application range of linen fibers.

Description

Technical Field

[0001] This invention belongs to the field of fiber textile technology, specifically relating to an elastic and abrasion-resistant linen fabric and its preparation method. Background Technology

[0002] Flax fiber is one of the earliest natural fibers used by humankind. Due to its naturalness, simplicity, rarity, natural color, and nobility, it is known as the "Queen of Natural Fibers." Flax fibers are straight and smooth, with a natural spindle-shaped structure and unique pectin-rich oblique pores, resulting in excellent performance in many aspects.

[0003] However, due to the high orientation and crystallinity of flax fibers, their breaking elongation is very small and their elastic recovery ability is poor, which makes the fabrics prone to wrinkling and wrinkles difficult to recover, thus limiting the application range of flax fabrics. In addition, flax fibers have disadvantages such as being not wear-resistant and not wash-resistant, which greatly reduces the durability and economic added value of flax fabrics.

[0004] Therefore, how to use flax fiber to prepare elastic and wear-resistant fabrics and improve the economic added value of flax fiber is an important research topic we face. Summary of the Invention

[0005] To address the problems existing in the background art, the present invention provides an elastic and abrasion-resistant linen fabric and its preparation method.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for preparing an elastic and abrasion-resistant linen fabric includes the following steps:

[0008] S1. Flax fiber pretreatment: First, soak the flax fiber in a 2.5-3wt% sulfuric acid aqueous solution for 20-40 minutes, filter, wash with clean water, then disperse it in a modified carboxymethyl cellulose aqueous solution, heat to 55-65℃, and perform immersion treatment for 2-3 hours, filter, and dry to obtain pretreated flax fiber.

[0009] S2. Preparation of core-spun yarn: Polyamide 66 fiber and flax fiber from step S1 are blended together, with flax fiber as the inner core yarn and polyamide 66 fiber as the outer layer yarn. The coverage rate is controlled at 45-55%. After drying, core-spun yarn is obtained.

[0010] S3. Preparation of reinforced core-spun yarn: Place the core-spun yarn from step S2 in the reinforcing solution and soak for 3-5 hours to obtain reinforced core-spun yarn;

[0011] S4. Yarn making and weaving: The reinforcing core-spun yarn is twisted to obtain warp and weft yarns. The warp and weft yarns are woven on an air-jet loom to form the fabric, that is, to obtain elastic and wear-resistant linen fabric.

[0012] Furthermore, the modified carboxymethyl cellulose aqueous solution in step S1 is an acid anhydride-modified carboxymethyl cellulose aqueous solution.

[0013] Furthermore, the preparation of the modified carboxymethyl cellulose aqueous solution in step S1 includes the following:

[0014] By weight, mix 1 part carboxymethyl cellulose with 90-110 parts deionized water, stir at room temperature for 10-20 minutes, adjust the pH to 8-9 with sodium hydroxide, heat to 50-60℃, and then add 0.4-0.6 parts of a mixture of maleic anhydride and isopropanol dropwise over 10-15 minutes. After the addition is complete, keep the temperature constant and continue stirring for 3-4 hours. Then adjust the pH to 5-6 with hydrochloric acid to obtain a modified carboxymethyl cellulose aqueous solution.

[0015] Furthermore, the mass ratio of maleic anhydride to isopropanol in the mixture of maleic anhydride and isopropanol is 2:3-5.

[0016] Furthermore, the preparation of the enhancing liquid in step S3 includes the following:

[0017] 1. Weigh 3 parts by weight of toluene diisocyanate, 0.2-0.3 parts by weight of tetrabromobisphenol A and 60-80 parts by weight of N,N-dimethylformamide, mix them evenly and add them to 4-6 parts by weight of polyethylene glycol. Stir and react at 80-90℃ for 1-1.5 hours. Then add 0.2-0.4 parts by weight of alkyl hydroxybenzoate and stir for 20-40 minutes to obtain hydroxyl-terminated polyurethane prepolymer.

[0018] 2. Mix 2-3 parts caprolactam, 1-1.5 parts adipic acid and 40-60 parts water evenly, heat to 60-70℃, stir evenly, then add 0.04-0.06 parts azobisisobutyronitrile, and react under high pressure of 0.2-0.3 MPa for 0.5-1 h to obtain a polyamide elastomer solution;

[0019] 3. Add the hydroxyl-terminated polyurethane prepolymer from step 1 to the polyamide elastomer solution from step 2, mix thoroughly, and stir for 1-1.5 hours to obtain the reinforcing solution.

[0020] Furthermore, the molecular weight of polyethylene glycol in step 1 is 6000 g / mol.

[0021] This application has the following beneficial effects:

[0022] 1. This invention provides an elastic and abrasion-resistant linen fabric and its preparation method. By core-spun blending polyamide 66 fiber and linen fiber, a composite fabric with excellent performance is obtained, which solves the problems of low resilience and poor abrasion resistance of linen fiber, expands the application range of linen fiber, and improves the durability of linen fabric.

[0023] 2. This invention uses a modified carboxymethyl cellulose solution to impregnate flax fibers, achieving full coating and protection of the flax fibers. On the one hand, this improves the mechanical strength and abrasion resistance of the fibers, and on the other hand, it provides active groups to the flax fibers, creating conditions for chemical bonding. In the preparation of the reinforcing liquid, the hydroxyl end-capping of the polyurethane prepolymer gives the reinforcing liquid extremely low viscosity and good fluidity, achieving full impregnation of the polyamide fibers. This improves the compatibility between the reinforcing liquid and the polyamide fibers, allowing the hydroxyl-capped polyurethane prepolymer and the polyamide elastomer to jointly enhance the resilience of the fabric.

[0024] 3. Modified carboxymethyl cellulose contains a large number of anhydride groups, while the reinforcing liquid contains abundant hydroxyl groups. Modified carboxymethyl cellulose can form a bonding effect with the reinforcing liquid, which can not only double impregnate the flax fibers, but also tightly connect the blended fibers through strong chemical bonds. Through the combined action of modified carboxymethyl cellulose and reinforcing liquid, the fabric can avoid stress relaxation when strain occurs and exhibit high resilience. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the embodiments.

[0026] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application are all commercially available.

[0027] Example 1

[0028] A method for preparing an elastic and abrasion-resistant linen fabric includes the following steps:

[0029] S1. Flax fiber pretreatment: The flax fiber is first soaked in a 3wt% sulfuric acid aqueous solution for 30 minutes, filtered, washed with water, then dispersed in a modified carboxymethyl cellulose aqueous solution, heated to 60℃, and soaked for 2.5 hours, filtered, and dried to obtain pretreated flax fiber.

[0030] S2. Preparation of core-spun yarn: Polyamide 66 fiber and flax fiber from step S1 are blended together, with flax fiber as the inner core yarn and polyamide 66 fiber as the outer layer yarn. The coverage rate is controlled at 50%. After drying, core-spun yarn is obtained.

[0031] S3. Preparation of reinforced core-spun yarn: Place the core-spun yarn from step S2 in the reinforcing solution and soak for 4 hours to obtain reinforced core-spun yarn;

[0032] S4. Yarn making and weaving: The reinforcing core-spun yarn is twisted to obtain warp and weft yarns. The warp and weft yarns are woven on an air-jet loom to form the fabric, that is, to obtain elastic and wear-resistant linen fabric.

[0033] The preparation of the modified carboxymethyl cellulose aqueous solution in step S1 includes the following:

[0034] By weight, 1 part carboxymethyl cellulose and 100 parts deionized water are mixed and stirred at room temperature for 15 minutes. The pH is adjusted to 8-9 with sodium hydroxide, and the mixture is heated to 55°C. Then, 0.5 parts of a mixture of maleic anhydride and isopropanol are added dropwise, controlling the addition to be completed within 10 minutes. After the addition is completed, the temperature is kept constant and stirring is continued for 3 hours. The pH is then adjusted to 5-6 with hydrochloric acid to obtain a modified carboxymethyl cellulose aqueous solution, wherein the mass ratio of maleic anhydride to isopropanol in the mixture is 1:2.

[0035] The preparation of the enhancement liquid in step S3 includes the following:

[0036] 1. Weigh 3 parts by weight of toluene diisocyanate, 0.25 parts by weight of tetrabromobisphenol A and 70 parts by weight of N,N-dimethylformamide, mix them evenly and add them to 5 parts by weight of polyethylene glycol (molecular weight of 6000 g / mol). Stir and react at 85°C for 1 h. Then add 0.3 parts by weight of alkyl hydroxybenzoate and stir for 30 min to obtain hydroxyl-terminated polyurethane prepolymer.

[0037] 2. Mix 2.5 parts caprolactam, 1.25 parts adipic acid and 50 parts water evenly, heat to 65°C, stir evenly, then add 0.05 parts azobisisobutyronitrile, and react under high pressure of 0.25 MPa for 1 hour to obtain a polyamide elastomer solution.

[0038] 3. Add the hydroxyl-terminated polyurethane prepolymer from step 1 to the polyamide elastomer solution from step 2, mix thoroughly, and stir for 1 hour to obtain the reinforcing solution.

[0039] Example 2

[0040] A method for preparing an elastic and abrasion-resistant linen fabric includes the following steps:

[0041] S1. Flax fiber pretreatment: The flax fiber was first soaked in a 2.5wt% sulfuric acid aqueous solution for 40 minutes, filtered, washed with water, and then dispersed in a modified carboxymethyl cellulose aqueous solution. The solution was heated to 55℃ and soaked for 3 hours. After filtration and drying, the pretreated flax fiber was obtained.

[0042] S2. Preparation of core-spun yarn: Polyamide 66 fiber and flax fiber from step S1 are blended together, with flax fiber as the inner core yarn and polyamide 66 fiber as the outer layer yarn. The coverage rate is controlled at 45%. After drying, core-spun yarn is obtained.

[0043] S3. Preparation of reinforced core-spun yarn: Place the core-spun yarn from step S2 in the reinforcing solution and soak for 3 hours to obtain reinforced core-spun yarn;

[0044] S4. Yarn making and weaving: The reinforcing core-spun yarn is twisted to obtain warp and weft yarns. The warp and weft yarns are woven on an air-jet loom to form the fabric, that is, to obtain elastic and wear-resistant linen fabric.

[0045] The preparation of the modified carboxymethyl cellulose aqueous solution in step S1 includes the following:

[0046] By weight, 1 part carboxymethyl cellulose and 110 parts deionized water were mixed and stirred at room temperature for 10 minutes. The pH was adjusted to 8-9 with sodium hydroxide, and the mixture was heated to 50°C. Then, 0.4 parts of a mixture of maleic anhydride and isopropanol were added dropwise over 10 minutes. After the addition was complete, the temperature was kept constant, and stirring was continued for 4 hours. The pH was then adjusted to 5-6 with hydrochloric acid to obtain a modified carboxymethyl cellulose aqueous solution. The mass ratio of maleic anhydride to isopropanol in the mixture was 2:3.

[0047] The preparation of the enhancement liquid in step S3 includes the following:

[0048] 1. Weigh 3 parts by weight of toluene diisocyanate, 0.2 parts by weight of tetrabromobisphenol A and 80 parts by weight of N,N-dimethylformamide, mix them evenly and add them to 4 parts by weight of polyethylene glycol (molecular weight of 6000 g / mol). Stir and react at 80°C for 1.5 h. Then add 0.4 parts by weight of alkyl hydroxybenzoate and stir for 40 min to obtain hydroxyl-terminated polyurethane prepolymer.

[0049] 2. Mix 3 parts caprolactam, 1.5 parts adipic acid and 60 parts water evenly, heat to 60°C, stir evenly, then add 0.06 parts azobisisobutyronitrile, and react under high pressure of 0.2 MPa for 1 hour to obtain a polyamide elastomer solution;

[0050] 3. Add the hydroxyl-terminated polyurethane prepolymer from step 1 to the polyamide elastomer solution from step 2, mix well, and stir for 1.5 hours to obtain the reinforcing solution.

[0051] Example 3

[0052] A method for preparing an elastic and abrasion-resistant linen fabric includes the following steps:

[0053] S1. Flax fiber pretreatment: Flax fiber is first soaked in 2.5wt% sulfuric acid aqueous solution for 40 min, filtered, washed with water, then dispersed in modified carboxymethyl cellulose aqueous solution, heated to 65℃, soaked for 2 h, filtered, and dried to obtain pretreated flax fiber.

[0054] S2. Preparation of core-spun yarn: Polyamide 66 fiber and flax fiber from step S1 are blended together, with flax fiber as the inner core yarn and polyamide 66 fiber as the outer layer yarn. The coverage rate is controlled at 55%. After drying, core-spun yarn is obtained.

[0055] S3. Preparation of reinforced core-spun yarn: Place the core-spun yarn from step S2 in the reinforcing solution and soak for 5 hours to obtain reinforced core-spun yarn;

[0056] S4. Yarn making and weaving: The reinforcing core-spun yarn is twisted to obtain warp and weft yarns. The warp and weft yarns are woven on an air-jet loom to form the fabric, that is, to obtain elastic and wear-resistant linen fabric.

[0057] The preparation of the modified carboxymethyl cellulose aqueous solution in step S1 includes the following:

[0058] By weight, 1 part carboxymethyl cellulose and 90 parts deionized water were mixed and stirred at room temperature for 20 minutes. The pH was adjusted to 8-9 with sodium hydroxide, and the mixture was heated to 60°C. Then, 0.6 parts of a mixture of maleic anhydride and isopropanol were added dropwise over 15 minutes. After the addition was complete, the temperature was kept constant, and stirring was continued for 4 hours. The pH was then adjusted to 5-6 with hydrochloric acid to obtain a modified carboxymethyl cellulose aqueous solution. The mass ratio of maleic anhydride to isopropanol in the mixture was 2:5.

[0059] The preparation of the enhancement liquid in step S3 includes the following:

[0060] 1. Weigh 3 parts by weight of toluene diisocyanate, 0.3 parts by weight of tetrabromobisphenol A and 80 parts by weight of N,N-dimethylformamide, mix them evenly and add them to 4 parts by weight of polyethylene glycol (molecular weight of 6000 g / mol). Stir and react at 85°C for 1.5 h. Then add 0.2 parts by weight of alkyl hydroxybenzoate and stir for 40 min to obtain hydroxyl-terminated polyurethane prepolymer.

[0061] 2. Mix 2.5 parts caprolactam, 1.5 parts adipic acid and 60 parts water evenly, heat to 70°C, stir evenly, then add 0.04 parts azobisisobutyronitrile, and react under high pressure of 0.25 MPa for 1 hour to obtain a polyamide elastomer solution.

[0062] 3. Add the hydroxyl-terminated polyurethane prepolymer from step 1 to the polyamide elastomer solution from step 2, mix thoroughly, and stir for 1 hour to obtain the reinforcing solution.

[0063] Example 4

[0064] A method for preparing an elastic and abrasion-resistant linen fabric includes the following steps:

[0065] S1. Flax fiber pretreatment: The flax fiber is first soaked in a 3wt% sulfuric acid aqueous solution for 20 minutes, filtered, washed with water, then dispersed in a modified carboxymethyl cellulose aqueous solution, heated to 5℃, and soaked for 2 hours, filtered, and dried to obtain pretreated flax fiber.

[0066] S2. Preparation of core-spun yarn: Polyamide 66 fiber and flax fiber from step S1 are blended together, with flax fiber as the inner core yarn and polyamide 66 fiber as the outer layer yarn. The coverage rate is controlled at 50%. After drying, core-spun yarn is obtained.

[0067] S3. Preparation of reinforced core-spun yarn: Place the core-spun yarn from step S2 in the reinforcing solution and soak for 4 hours to obtain reinforced core-spun yarn;

[0068] S4. Yarn making and weaving: The reinforcing core-spun yarn is twisted to obtain warp and weft yarns. The warp and weft yarns are woven on an air-jet loom to form the fabric, that is, to obtain elastic and wear-resistant linen fabric.

[0069] The preparation of the modified carboxymethyl cellulose aqueous solution in step S1 includes the following:

[0070] By weight, 1 part carboxymethyl cellulose and 100 parts deionized water were mixed and stirred at room temperature for 20 minutes. The pH was adjusted to 8-9 with sodium hydroxide, and the mixture was heated to 50°C. Then, 0.6 parts of a mixture of maleic anhydride and isopropanol were added dropwise over 15 minutes. After the addition was complete, the temperature was kept constant, and stirring was continued for 3 hours. The pH was then adjusted to 5-6 with hydrochloric acid to obtain a modified carboxymethyl cellulose aqueous solution. The mass ratio of maleic anhydride to isopropanol in the mixture was 2:3.

[0071] The preparation of the enhancement liquid in step S3 includes the following:

[0072] 1. Weigh 3 parts by weight of toluene diisocyanate, 0.25 parts by weight of tetrabromobisphenol A and 80 parts by weight of N,N-dimethylformamide, mix them evenly and add them to 6 parts by weight of polyethylene glycol (molecular weight of 6000 g / mol). Stir and react at 90°C for 1 h, then add 0.2 parts by weight of alkyl hydroxybenzoate and stir for 40 min to obtain hydroxyl-terminated polyurethane prepolymer;

[0073] 2. Mix 2 parts caprolactam, 1.5 parts adipic acid and 50 parts water evenly, heat to 65°C, stir evenly, then add 0.04 parts azobisisobutyronitrile, and react under high pressure of 0.3 MPa for 0.5 h to obtain a polyamide elastomer solution;

[0074] 3. Add the hydroxyl-terminated polyurethane prepolymer from step 1 to the polyamide elastomer solution from step 2, mix thoroughly, and stir for 1 hour to obtain the reinforcing solution.

[0075] Example 5

[0076] A method for preparing an elastic and abrasion-resistant linen fabric includes the following steps:

[0077] S1. Flax fiber pretreatment: The flax fiber was first soaked in a 2.5wt% sulfuric acid aqueous solution for 40 minutes, filtered, washed with water, and then dispersed in a modified carboxymethyl cellulose aqueous solution. The solution was heated to 60℃ and soaked for 3 hours. After filtration and drying, the pretreated flax fiber was obtained.

[0078] S2. Preparation of core-spun yarn: Polyamide 66 fiber and flax fiber from step S1 are blended together, with flax fiber as the inner core yarn and polyamide 66 fiber as the outer layer yarn. The coverage rate is controlled at 50%. After drying, core-spun yarn is obtained.

[0079] S3. Preparation of reinforced core-spun yarn: Place the core-spun yarn from step S2 in the reinforcing solution and soak for 3 hours to obtain reinforced core-spun yarn;

[0080] S4. Yarn making and weaving: The reinforcing core-spun yarn is twisted to obtain warp and weft yarns. The warp and weft yarns are woven on an air-jet loom to form the fabric, that is, to obtain elastic and wear-resistant linen fabric.

[0081] The preparation of the modified carboxymethyl cellulose aqueous solution in step S1 includes the following:

[0082] By weight, 1 part carboxymethyl cellulose and 100 parts deionized water were mixed and stirred at room temperature for 10 minutes. The pH was adjusted to 8-9 with sodium hydroxide, and the mixture was heated to 50°C. Then, 0.4 parts of a mixture of maleic anhydride and isopropanol were added dropwise over 15 minutes. After the addition was complete, the temperature was kept constant, and stirring was continued for 4 hours. The pH was then adjusted to 5-6 with hydrochloric acid to obtain a modified carboxymethyl cellulose aqueous solution. The mass ratio of maleic anhydride to isopropanol in the mixture was 1:2.

[0083] The preparation of the enhancement liquid in step S3 includes the following:

[0084] 1. Weigh 3 parts by weight of toluene diisocyanate, 0.3 parts by weight of tetrabromobisphenol A and 80 parts by weight of N,N-dimethylformamide, mix them evenly and add them to 4 parts by weight of polyethylene glycol (molecular weight of 6000 g / mol). Stir and react at 85°C for 1.5 h. Then add 0.4 parts by weight of alkyl hydroxybenzoate and stir for 40 min to obtain hydroxyl-terminated polyurethane prepolymer.

[0085] 2. Mix 2.5 parts caprolactam, 1 part adipic acid and 40 parts water evenly, heat to 70°C, stir evenly, then add 0.05 parts azobisisobutyronitrile, and react under high pressure of 0.25 MPa for 1 hour to obtain a polyamide elastomer solution.

[0086] 3. Add the hydroxyl-terminated polyurethane prepolymer from step 1 to the polyamide elastomer solution from step 2, mix well, and stir for 1.5 hours to obtain the reinforcing solution.

[0087] Comparative Example 1

[0088] The only difference between this comparative example and Example 1 is that maleic anhydride is not added in the preparation of the modified carboxymethyl cellulose aqueous solution in step S1.

[0089] Specifically, the preparation of the modified carboxymethyl cellulose aqueous solution in step S1 includes the following:

[0090] By weight, mix 1 part carboxymethyl cellulose and 100 parts deionized water, stir at room temperature for 15 minutes, adjust the pH to 8-9 with sodium hydroxide, heat to 55°C, and then add 0.5 parts isopropanol dropwise, controlling the addition to be completed within 10 minutes. After the addition is completed, keep the temperature constant and continue stirring for 3 hours. Then adjust the pH to 5-6 with hydrochloric acid to obtain a modified carboxymethyl cellulose aqueous solution.

[0091] Comparative Example 2

[0092] The only difference between this comparative example and Example 1 is that alkyl hydroxybenzoate is not added in the preparation of the enhancing liquid in step S3.

[0093] Specifically, the preparation of the enhancing liquid in step S3 includes the following:

[0094] 1. Weigh 3 parts by weight of toluene diisocyanate, 0.25 parts by weight of tetrabromobisphenol A and 70 parts by weight of N,N-dimethylformamide, mix them evenly and add them to 5 parts by weight of polyethylene glycol (molecular weight of 6000 g / mol). Stir and react at 85°C for 1.5 h to obtain hydroxyl-terminated polyurethane prepolymer.

[0095] 2. Mix 2.5 parts caprolactam, 1.25 parts adipic acid and 50 parts water evenly, heat to 65°C, stir evenly, then add 0.05 parts azobisisobutyronitrile, and react under high pressure of 0.25 MPa for 1 hour to obtain a polyamide elastomer solution.

[0096] 3. Add the hydroxyl-terminated polyurethane prepolymer from step 1 to the polyamide elastomer solution from step 2, mix thoroughly, and stir for 1 hour to obtain the reinforcing solution.

[0097] Comparative Example 3

[0098] The only difference between this comparative example and Example 1 is that maleic anhydride is not added in the preparation of the modified carboxymethyl cellulose aqueous solution, and alkyl hydroxybenzoate is not added in the preparation of the reinforcing solution in step S3.

[0099] Comparative Example 4

[0100] The only difference between this comparative example and Example 1 is that polyamide elastomer is not added in the preparation of the reinforcing liquid in step S3;

[0101] Specifically, the preparation of the enhancing liquid in step S3 includes the following:

[0102] 1. Weigh 3 parts by weight of toluene diisocyanate, 0.25 parts by weight of tetrabromobisphenol A and 70 parts by weight of N,N-dimethylformamide, mix them evenly and add them to 5 parts by weight of polyethylene glycol (molecular weight of 6000 g / mol). Stir and react at 85°C for 1 h. Then add 0.3 parts by weight of alkyl hydroxybenzoate and stir for 30 min to obtain hydroxyl-terminated polyurethane prepolymer.

[0103] 2. Add the hydroxyl-terminated polyurethane prepolymer from step 1 to 50 parts of water, mix well, and stir for 1 hour to obtain the reinforcing liquid.

[0104] Comparative Example 5

[0105] The only difference between this comparative example and Example 1 is that in step S2, polyamide 66 fiber is used as the inner core yarn and flax fiber is used as the outer yarn in the preparation of the core-spun yarn, and the coverage rate is controlled at 50%.

[0106] Proof of effectiveness

[0107] Resilience: The fabrics obtained in the examples and comparative examples were cut to make samples of fixed size and length L0. The samples were placed at room temperature for 24 hours. Then, one end of the sample was fixed, and the other end of the sample was stretched to 1.2 times the length of L0. The stretching was held for 1 minute, and then released, allowing the sample to naturally shrink back for 15 seconds. The length L1 of the sample at this time was measured. Elastic recovery rate (%) = (1.2 × L0 - L1) / (0.2 × L0) × 100%. The test results are shown in Table 1.

[0108] Abrasion resistance: Abrasion resistance is measured according to standard GB / T 21196.3-2007 "Textiles - Martindale Method - Determination of Abrasion Resistance of Fabrics - Part 3: Determination of Mass Loss". The friction loss is the mass loss after 2000 friction cycles. The greater the friction loss, the more severe the wear and the worse the abrasion resistance of the fabric.

[0109] Table 1

[0110]

[0111]

[0112] Results Analysis

[0113] Analysis of Examples 1-5 and Comparative Examples 1-5, combined with Table 1, shows that the elastic and abrasion-resistant linen fabric provided by the present invention has excellent resilience and high abrasion resistance. Specific analysis is as follows:

[0114] Compared with Example 1, maleic anhydride was not added in the preparation of the modified carboxymethyl cellulose aqueous solution, and the abrasion resistance index of the fabric was significantly increased, while the abrasion resistance was worse.

[0115] Compared with Comparative Example 2 and Example 1, no alkyl hydroxybenzoate was added in the preparation of the reinforcing liquid, and the elastic recovery rate of the fabric was significantly reduced, resulting in a decrease in fabric resilience.

[0116] Compared with Example 1, maleic anhydride was not added in the preparation of the modified carboxymethyl cellulose aqueous solution, and alkyl hydroxybenzoate was not added in the preparation of the reinforcing liquid. The resulting fabric had significantly reduced abrasion resistance and a substantial decrease in resilience.

[0117] As can be seen from Comparative Examples 1-3 and Example 1, in the system described in this invention, the addition of maleic anhydride can improve the resilience of the fabric, the addition of alkyl hydroxybenzoate can improve the abrasion resistance of the fabric, and the interaction between maleic anhydride and alkyl hydroxybenzoate can produce a synergistic effect, jointly improving the resilience of the fabric.

[0118] Compared with Example 1, no polyamide elastomer was added in the preparation of the reinforcing liquid, and the resilience of the fabric was significantly reduced. This shows that the addition of polyamide elastomer can significantly improve the resilience of the fabric.

[0119] Compared with Example 1, in the preparation of core-spun yarn, polyamide 66 fiber was used as the inner core yarn and flax fiber was used as the outer layer yarn. The elasticity and abrasion resistance of the fabric were reduced, indicating that the different material settings of the inner core yarn and the outer layer yarn have a great influence on the elasticity and abrasion resistance of the fabric.

[0120] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0121] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for preparing an elastic and abrasion-resistant linen fabric, characterized in that, The preparation method includes the following steps: S1. Flax fiber pretreatment: First, soak the flax fiber in a 2.5-3wt% sulfuric acid aqueous solution for 20-40 minutes, filter, wash with clean water, then disperse it in a modified carboxymethyl cellulose aqueous solution, heat to 55-65℃, soak for 2-3 hours, filter, and dry to obtain pretreated flax fiber. S2. Preparation of core-spun yarn: Polyamide 66 fiber and flax fiber from step S1 are blended together, with flax fiber as the inner core yarn and polyamide 66 fiber as the outer layer yarn. The coverage rate is controlled at 45-55%. After drying, core-spun yarn is obtained. S3. Preparation of reinforced core-spun yarn: Place the core-spun yarn from step S2 in the reinforcing solution and soak for 3-5 hours to obtain reinforced core-spun yarn; S4. Yarn making and fabric weaving: After twisting the reinforcing core-spun yarn, warp and weft yarns are obtained. The warp and weft yarns are woven to form fabric, that is, elastic and wear-resistant linen fabric. In step S1, the modified carboxymethyl cellulose aqueous solution is an anhydride-modified carboxymethyl cellulose aqueous solution. The preparation process specifically includes the following: by weight, 1 part of carboxymethyl cellulose and 90-110 parts of deionized water are mixed and stirred at room temperature for 10-20 minutes. The pH value is adjusted to 8-9 with sodium hydroxide, and the mixture is heated to 50-60℃. Then, 0.4-0.6 parts of a mixture of maleic anhydride and isopropanol are added dropwise, and the addition is controlled to be completed within 10-15 minutes. After the addition is completed, the temperature is kept constant and stirring is continued for 3-4 hours. The pH value is then adjusted to 5-6 with hydrochloric acid to obtain the modified carboxymethyl cellulose aqueous solution. The preparation process of the enhancing liquid in step S3 includes the following: 1) Weigh 3 parts by weight of toluene diisocyanate, 0.2-0.3 parts by weight of tetrabromobisphenol A and 60-80 parts by weight of N,N-dimethylformamide, mix them evenly and add them to 4-6 parts by weight of polyethylene glycol. Stir and react at 80-90℃ for 1-1.5 hours. Then add 0.2-0.4 parts by weight of alkyl hydroxybenzoate and stir for 20-40 minutes to obtain hydroxyl-terminated polyurethane prepolymer. 2) Mix 2-3 parts caprolactam, 1-1.5 parts adipic acid and 40-60 parts water evenly, heat to 60-70℃, stir evenly, then add 0.04-0.06 parts azobisisobutyronitrile, and react under high pressure of 0.2-0.3 MPa for 0.5-1 h to obtain a polyamide elastomer solution; 3) Add the hydroxyl-terminated polyurethane prepolymer from step 1 to the polyamide elastomer solution from step 2, mix well, and stir for 1-1.5 hours to obtain the reinforcing solution.

2. The method for preparing an elastic and abrasion-resistant linen fabric according to claim 1, characterized in that, In the mixture of maleic anhydride and isopropanol, the mass ratio of maleic anhydride to isopropanol is 2:3-5.

3. The method for preparing an elastic and abrasion-resistant linen fabric according to claim 1, characterized in that, In step 1, the molecular weight of polyethylene glycol is 6000 g / mol.

4. An elastic and abrasion-resistant linen fabric, characterized in that, It is prepared by the preparation method described in any one of claims 1-3.

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