Durable hydrophilic softening finishing agent for special-shaped section nylon fabric and preparation method thereof

Abstract

This invention relates to the field of fabric finishing agents, and more particularly to a durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics and its preparation method. The aforementioned durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics comprises, by weight, the following raw materials: 10-15 parts adipic acid, 5-10 parts hexamethylenediamine, 1-5 parts amino-terminated polyamide amine, 10-30 parts polyether amine 400, 0.1-0.5 parts catalyst A, 30-50 parts double-terminated epoxy polyether silicone oil, 1-5 parts polyether amine 900, 0.1-1 part diethylenetriamine, 1.1-4 parts glacial acetic acid, 5-15 parts surfactant, 10-20 parts polyethylene glycol, 1-5 parts hexamethylene diisocyanate, 0.01-0.1 parts catalyst B, 1-5 parts 2-acrylamido-2-methylpropanesulfonic acid, 1-3 parts dicyandiamide, and 1-5 parts amino silicone oil. This invention has outstanding softness, good elasticity, hydrophilicity, and washability.

Description

Technical Field

[0001] This invention relates to the field of fabric finishing agents, and in particular to a durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics and its preparation method. Background Technology

[0002] Nylon fabric, due to its excellent abrasion resistance and high tensile strength, has become one of the most commonly used fabrics in the sportswear industry. Currently, to improve the skin-friendly feel and functionality of nylon-spandex elastic fabrics, post-processing softening is a key step. Organosilicon softeners, especially amino silicone oils, are commonly used for treatment. However, fabrics treated with conventional amino silicone oils often exhibit decreased hydrophilicity and insufficient softness, affecting fabric comfort.

[0003] Meanwhile, amino silicone oil softener has weak adhesion to the surface of nylon fibers and is easily detached from the fabric under washing conditions, resulting in insufficient wash resistance. Amino silicone oil also exhibits yellowing, severely affecting the appearance quality of light-colored fabrics.

[0004] Currently, the development of a softening agent, especially for irregularly shaped nylon fabrics, that can maintain excellent softness, provide good hydrophilicity, and also ensure durability, thereby enhancing product added value, has excellent research prospects. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a durable hydrophilic softening agent for irregularly shaped nylon fabrics and its preparation method.

[0006] A durable hydrophilic softening agent for irregularly shaped nylon fabrics, comprising the following raw materials by weight: 10-15 parts adipic acid, 5-10 parts hexamethylenediamine, 1-5 parts amino-terminated polyamide amine, 10-30 parts polyetheramine 400, 0.1-0.5 parts catalyst A, 30-50 parts double-terminated epoxy polyether silicone oil, 1-5 parts polyetheramine 900, 0.1-1 part diethylenetriamine, 1.1-4 parts glacial acetic acid, 5-15 parts surfactant, 10-20 parts polyethylene glycol, 1-5 parts hexamethylene diisocyanate, 0.01-0.1 parts catalyst B, 1-5 parts 2-acrylamido-2-methylpropanesulfonic acid, 1-3 parts dicyandiamide, and 1-5 parts amino silicone oil.

[0007] Preferably, catalyst A is p-toluenesulfonic acid.

[0008] Preferably, the surfactant is sodium dodecyl sulfate or / and fatty alcohol polyoxyethylene ether.

[0009] Preferably, the average molecular weight of polyethylene glycol is 400-800.

[0010] Preferably, catalyst B is dibutyltin dilaurate.

[0011] Preferably, the nitrogen content of the amino silicone oil is 0.37±0.05%.

[0012] The preparation method of the above-mentioned durable hydrophilic softening agent for irregular cross-section nylon fabrics includes the following steps: S1. Under nitrogen protection, add adipic acid, hexamethylenediamine, amino-terminated polyamide amine, polyether amine 400, and catalyst A to the reactor. Stir at 150-170℃ for 1-2 hours, vacuum polycondense at 20-60kPa for 10-30 minutes, and cool to obtain preform a. S2. Add double-ended epoxy polyether silicone oil, polyetheramine 900, diethylenetriamine, and glacial acetic acid to the solvent, stir at 80-90℃ for 5-15h, remove the solvent by vacuum distillation, add surfactant, glacial acetic acid, and water, homogenize for 10-30min at a homogenization temperature of 50-60℃, and obtain preform b. S3. Add hexamethylene diisocyanate to polyethylene glycol and stir until uniform. Add catalyst B and stir at 50-60℃ for 3-6 hours. Cool down to 30-40℃ and add 2-acrylamido-2-methylpropanesulfonic acid while stirring. Stir for 1-2 hours and then heat up to 70-80℃ and stir for 2-4 hours to obtain preform c. S4. Add preform a, preform b, dicyandiamide, and amino silicone oil to preform c and stir until homogeneous.

[0013] Preferably, in S2, the mass ratio of glacial acetic acid added together with the double-ended epoxy polyether silicone oil is [missing value]. x The mass ratio of glacial acetic acid added together with the surfactant is... y , x ÷ y =0.1-1:1-3.

[0014] Preferably, in S2, the solvent is at least one of methanol, isopropanol, and ethylene glycol monobutyl ether.

[0015] Preferably, in step S2, the homogenization rate is 1000-2000 r / min.

[0016] Compared with existing technologies, the present invention has the following advantages: This invention utilizes the synergistic effect of polyetheramine-modified epoxy polyether silicone oil and amino silicone oil to construct a flexible hydrophilic film on the fiber surface, which can significantly improve the moisture absorption and diffusion capacity of the fabric. Furthermore, in conjunction with the polyamide-polyether structure, it can interact with the fiber during heat treatment and firmly anchor the hydrophilic functional groups to the fiber surface, effectively solving the problem of easy detachment of hydrophilic segments from conventional finishing agents.

[0017] This invention utilizes a compound of amino silicone oil and dicyandiamide, which helps stabilize the structure, alleviates the yellowing phenomenon caused by oxidation of traditional amino silicone oil during high-temperature baking or storage, and helps ensure the smooth progress of the reaction and improve the storage stability of the final product, avoiding problems such as demulsification or oil floating during application.

[0018] This invention features outstanding softness, good elasticity, hydrophilicity, washability, and anti-yellowing properties. While giving nylon fabrics excellent hydrophilicity and softness, it achieves functional durability and takes into account appearance quality and processing stability. It can give nylon-spandex elastic fabrics excellent comfort, making them more suitable for producing high-end fabric products with high added value and broad market prospects. Attached Figure Description

[0019] Figure 1 The image shows a comparison of the softness grades of irregularly shaped nylon fabrics treated with the hydrophilic softening agents obtained in Example 5 and Comparative Examples 1-2, respectively.

[0020] Figure 2 The graph shows a comparison of the elastic recovery rates of irregularly shaped nylon fabrics treated with the hydrophilic softening agent obtained in Example 5.

[0021] Figure 3 The image shows a comparison of the water diffusion time of irregularly shaped nylon fabrics treated with the hydrophilic softening agent obtained in Example 5. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to specific embodiments. The given embodiments are merely illustrative of the invention and not intended to limit its scope. The embodiments provided below can serve as a guide for further improvements by those skilled in the art and do not constitute a limitation on the invention in any way.

[0023] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Unless otherwise specified, the materials and reagents used in the following examples are commercially available.

[0024] The polyetheramine 400 used below was purchased from Wuhan Moumic Biomedical Technology Co., Ltd. The polyetheramine 900 used below was purchased from Hubei Moubowan Biomedical Co., Ltd. The double-terminated epoxy polyether silicone oil used below was purchased from Hubei Mouyuhong Biomedical Technology Co., Ltd. The amino-terminated polyamide amine (PAMAM, G4.0) used below was purchased from Hangzhou Mouqiao Biotechnology Co., Ltd. The amino silicone oil used below was sourced from Dow Chemical, USA, model OFX-8040A, with a nitrogen content of 0.37±0.05%.

[0025] Example 1 A durable hydrophilic softening agent for irregularly shaped nylon fabrics comprises the following raw materials: 10g adipic acid, 5g hexamethylenediamine, 1g amino-terminated polyamide amine, 10g polyetheramine 400, 0.1g p-toluenesulfonic acid, 30g double-terminated epoxy polyether silicone oil, 1g polyetheramine 900, 0.1g diethylenetriamine, 1.1g glacial acetic acid, 5g AEO-9, 10g polyethylene glycol 600, 1g hexamethylene diisocyanate, 0.01g dibutyltin dilaurate, 1g 2-acrylamido-2-methylpropanesulfonic acid, 1g dicyandiamide, and 1g amino silicone oil.

[0026] The preparation method of the above-mentioned durable hydrophilic softening agent for irregular cross-section nylon fabrics includes the following steps: S1. Under nitrogen protection, adipic acid, hexamethylenediamine, amino-terminated polyamide amine, polyetheramine 400 and p-toluenesulfonic acid are added to the reactor. The mixture is stirred at 150℃ for 1 hour, and then vacuum polycondensed at 20kPa for 10 minutes. After cooling, preform a is obtained. S2. Add double-ended epoxy polyether silicone oil, polyetheramine 900, diethylenetriamine, and 0.1g glacial acetic acid to 80g methanol, stir at 80℃ for 5h, remove methanol by vacuum distillation, add AEO-9, 1g glacial acetic acid, and 50g deionized water, and homogenize for 10min at a homogenization speed of 1000r / min and a homogenization temperature of 50℃ to obtain preform b; S3. Add hexamethylene diisocyanate to polyethylene glycol 600 and stir until uniform. Add dibutyltin dilaurate and stir at 50°C for 3 hours. Cool down to 30°C and add 2-acrylamido-2-methylpropanesulfonic acid while stirring. Stir for 1 hour and then heat to 70°C and stir for 2 hours to obtain preform c. S4. Add preform a, preform b, dicyandiamide, and amino silicone oil to preform c and stir until homogeneous.

[0027] Example 2 A durable hydrophilic softening agent for irregularly shaped nylon fabrics comprises the following raw materials: 15g adipic acid, 10g hexamethylenediamine, 5g amino-terminated polyamide amine, 30g polyetheramine 400, 0.5g p-toluenesulfonic acid, 50g double-terminated epoxy polyether silicone oil, 5g polyetheramine 900, 1g diethylenetriamine, 4g glacial acetic acid, 15g AEO-9, 20g polyethylene glycol 600, 5g hexamethylene diisocyanate, 0.1g dibutyltin dilaurate, 5g 2-acrylamido-2-methylpropanesulfonic acid, 3g dicyandiamide, and 5g amino silicone oil.

[0028] The preparation method of the above-mentioned durable hydrophilic softening agent for irregular cross-section nylon fabrics includes the following steps: S1. Under nitrogen protection, add adipic acid, hexamethylenediamine, amino-terminated polyamide amine, polyether amine 400, and p-toluenesulfonic acid to the reactor. Stir at 170℃ for 2 hours, then perform vacuum polycondensation at 60kPa for 30 minutes. Cool down to obtain preform a. S2. Add double-ended epoxy polyether silicone oil, polyetheramine 900, diethylenetriamine, and 1g glacial acetic acid to 150g isopropanol, stir at 90℃ for 15h, remove isopropanol by vacuum distillation, add AEO-9, 3g glacial acetic acid, and 150g deionized water, and homogenize for 30min at a homogenization speed of 2000r / min and a homogenization temperature of 60℃ to obtain preform b; S3. Add hexamethylene diisocyanate to polyethylene glycol 600 and stir until uniform. Add dibutyltin dilaurate and stir at 60°C for 6 hours. Cool down to 40°C and add 2-acrylamido-2-methylpropanesulfonic acid while stirring. Stir for 2 hours and then heat up to 80°C and stir for 4 hours to obtain preform c. S4. Add preform a, preform b, dicyandiamide, and amino silicone oil to preform c and stir until homogeneous.

[0029] Example 3 A durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics comprises the following raw materials: 11g adipic acid, 9g hexamethylenediamine, 2g amino-terminated polyamide amine, 25g polyetheramine 400, 0.2g p-toluenesulfonic acid, 45g double-terminated epoxy polyether silicone oil, 2g polyetheramine 900, 0.8g diethylenetriamine, 3.3g glacial acetic acid, 8g AEO-9, 18g polyethylene glycol 600, 2g hexamethylene diisocyanate, 0.07g dibutyltin dilaurate, 2g 2-acrylamido-2-methylpropanesulfonic acid, 2.5g dicyandiamide, and 2g amino silicone oil.

[0030] The preparation method of the above-mentioned durable hydrophilic softening agent for irregular cross-section nylon fabrics includes the following steps: S1. Under nitrogen protection, add adipic acid, hexamethylenediamine, amino-terminated polyamide amine, polyether amine 400, and p-toluenesulfonic acid to the reactor. Stir at 165℃ for 80 min, then perform vacuum polycondensation at 30 kPa for 15 min. Cool down to obtain preform a. S2. Add double-ended epoxy polyether silicone oil, polyetheramine 900, diethylenetriamine, and 0.8g glacial acetic acid to 100g ethylene glycol monobutyl ether, stir at 88℃ for 8h, remove ethylene glycol monobutyl ether by vacuum distillation, add AEO-9, 2.5g glacial acetic acid, and 80g deionized water, and homogenize for 25min at a homogenization speed of 1200r / min and a homogenization temperature of 58℃ to obtain preform b; S3. Add hexamethylene diisocyanate to polyethylene glycol 600 and stir until homogeneous. Add dibutyltin dilaurate and stir at 52°C for 5 hours. Cool down to 33°C and add 2-acrylamido-2-methylpropanesulfonic acid while stirring. Stir for 100 minutes and then heat to 73°C and stir for 3.5 hours to obtain preform c. S4. Add preform a, preform b, dicyandiamide, and amino silicone oil to preform c and stir until homogeneous.

[0031] Example 4 A durable hydrophilic softening agent for irregularly shaped nylon fabrics comprises the following raw materials: 13g adipic acid, 7g hexamethylenediamine, 4g amino-terminated polyamide amine, 15g polyetheramine 400, 0.4g p-toluenesulfonic acid, 35g double-terminated epoxy polyether silicone oil, 4g polyetheramine 900, 0.2g diethylenetriamine, 1.7g glacial acetic acid, 12g AEO-9, 12g polyethylene glycol 600, 4g hexamethylene diisocyanate, 0.03g dibutyltin dilaurate, 4g 2-acrylamido-2-methylpropanesulfonic acid, 1.5g dicyandiamide, and 4g amino silicone oil.

[0032] The preparation method of the above-mentioned durable hydrophilic softening agent for irregular cross-section nylon fabrics includes the following steps: S1. Under nitrogen protection, add adipic acid, hexamethylenediamine, amino-terminated polyamide amine, polyetheramine 400, and p-toluenesulfonic acid to the reactor. Stir at 155℃ for 100 min, then perform vacuum polycondensation at 50 kPa for 25 min. Cool down to obtain preform a. S2. Add double-ended epoxy polyether silicone oil, polyetheramine 900, diethylenetriamine, and 0.2g glacial acetic acid to 140g ethylene glycol monobutyl ether, stir at 82℃ for 12h, remove ethylene glycol monobutyl ether by vacuum distillation, add AEO-9, 1.5g glacial acetic acid, and 120g deionized water, and homogenize for 15min at a homogenization speed of 1800r / min and a homogenization temperature of 52℃ to obtain preform b; S3. Add hexamethylene diisocyanate to polyethylene glycol 600 and stir until homogeneous. Add dibutyltin dilaurate and stir at 58°C for 4 hours. Cool down to 37°C and add 2-acrylamido-2-methylpropanesulfonic acid while stirring. Stir for 80 minutes and then heat to 77°C and stir for 2.5 hours to obtain preform c. S4. Add preform a, preform b, dicyandiamide, and amino silicone oil to preform c and stir until homogeneous.

[0033] Example 5 A durable hydrophilic softening agent for irregularly shaped nylon fabrics comprises the following raw materials: 12g adipic acid, 8g hexamethylenediamine, 3g amino-terminated polyamide amine, 20g polyetheramine 400, 0.3g p-toluenesulfonic acid, 40g double-terminated epoxy polyether silicone oil, 3g polyetheramine 900, 0.5g diethylenetriamine, 2.5g glacial acetic acid, 10g AEO-9, 15g polyethylene glycol 600, 3g hexamethylene diisocyanate, 0.05g dibutyltin dilaurate, 3g 2-acrylamido-2-methylpropanesulfonic acid, 2g dicyandiamide, and 3g amino silicone oil.

[0034] The preparation method of the above-mentioned durable hydrophilic softening agent for irregular cross-section nylon fabrics includes the following steps: S1. Under nitrogen protection, add adipic acid, hexamethylenediamine, amino-terminated polyamide amine, polyether amine 400, and p-toluenesulfonic acid to the reactor. Stir at 160℃ for 90 min, then perform vacuum polycondensation at 40 kPa for 20 min. Cool down to obtain preform a. S2. Add double-ended epoxy polyether silicone oil, polyetheramine 900, diethylenetriamine, and 0.5g glacial acetic acid to 120g ethylene glycol monobutyl ether, stir at 85℃ for 10h, remove ethylene glycol monobutyl ether by vacuum distillation, add AEO-9, 2g glacial acetic acid, and 100g deionized water, and homogenize for 20min at a homogenization speed of 1500r / min and a homogenization temperature of 55℃ to obtain preform b; S3. Add hexamethylene diisocyanate to polyethylene glycol 600 and stir until homogeneous. Add dibutyltin dilaurate and stir at 55°C for 4.5 hours. Cool down to 35°C and add 2-acrylamido-2-methylpropanesulfonic acid while stirring. Stir for 90 minutes and then heat to 75°C and stir for 3 hours to obtain preform c. S4. Add preform a, preform b, dicyandiamide, and amino silicone oil to preform c and stir until homogeneous.

[0035] Comparative Example 1 A durable hydrophilic softening agent for irregularly shaped nylon fabrics comprises the following raw materials: 12g adipic acid, 8g hexamethylenediamine, 23g polyetheramine 400, 0.3g p-toluenesulfonic acid, 40g double-ended epoxy polyether silicone oil, 3g polyetheramine 900, 0.5g diethylenetriamine, 2.5g glacial acetic acid, 10g AEO-9, 15g polyethylene glycol 600, 3g hexamethylene diisocyanate, 0.05g dibutyltin dilaurate, 3g 2-acrylamido-2-methylpropanesulfonic acid, 2g dicyandiamide, and 3g amino silicone oil.

[0036] The preparation method of the above-mentioned durable hydrophilic softening agent for irregular cross-section nylon fabrics includes the following steps: S1. Under nitrogen protection, add adipic acid, hexamethylenediamine, polyetheramine 400 and p-toluenesulfonic acid to the reactor, stir at 160℃ for 90 min, vacuum polycondense at 40 kPa for 20 min, and cool down to obtain preform a. S2. Add double-ended epoxy polyether silicone oil, polyetheramine 900, diethylenetriamine, and 0.5g glacial acetic acid to 120g ethylene glycol monobutyl ether, stir at 85℃ for 10h, remove ethylene glycol monobutyl ether by vacuum distillation, add AEO-9, 2g glacial acetic acid, and 100g deionized water, and homogenize for 20min at a homogenization speed of 1500r / min and a homogenization temperature of 55℃ to obtain preform b; S3. Add hexamethylene diisocyanate to polyethylene glycol 600 and stir until homogeneous. Add dibutyltin dilaurate and stir at 55°C for 4.5 hours. Cool down to 35°C and add 2-acrylamido-2-methylpropanesulfonic acid while stirring. Stir for 90 minutes and then heat to 75°C and stir for 3 hours to obtain preform c. S4. Add preform a, preform b, dicyandiamide, and amino silicone oil to preform c and stir until homogeneous.

[0037] Comparative Example 2 A durable hydrophilic softening agent for irregularly shaped nylon fabrics, comprising the following raw materials: 40g of double-ended epoxy polyether silicone oil, 3g of polyetheramine 900, 0.5g of diethylenetriamine, 2.5g of glacial acetic acid, 10g of AEO-9, 15g of polyethylene glycol 600, 3g of hexamethylene diisocyanate, 0.05g of dibutyltin dilaurate, 3g of 2-acrylamido-2-methylpropanesulfonic acid, 2g of dicyandiamide, and 3g of amino silicone oil.

[0038] The preparation method of the above-mentioned durable hydrophilic softening agent for irregular cross-section nylon fabrics includes the following steps: S1. Add double-ended epoxy polyether silicone oil, polyetheramine 900, diethylenetriamine, and 0.5g glacial acetic acid to 120g ethylene glycol monobutyl ether. Stir at 85℃ for 10h, remove ethylene glycol monobutyl ether by vacuum distillation, add AEO-9, 2g glacial acetic acid, and 100g deionized water, and homogenize for 20min at a homogenization speed of 1500r / min and a homogenization temperature of 55℃ to obtain preform b. S2. Add hexamethylene diisocyanate to polyethylene glycol 600 and stir until homogeneous. Add dibutyltin dilaurate and stir at 55°C for 4.5 hours. Cool down to 35°C and add 2-acrylamido-2-methylpropanesulfonic acid while stirring. Stir for 90 minutes and then heat to 75°C and stir for 3 hours to obtain preform c. S3. Add preform b, dicyandiamide, and amino silicone oil to preform c and stir until homogeneous.

[0039] Using irregularly shaped nylon fabrics (from the same batch) provided by a textile company in Shaoxing as experimental subjects, the hydrophilic softening agents obtained in Example 5 and Comparative Examples 1-2 were used to treat the irregularly shaped nylon fabrics at a dosage of 25 g / L and a pick-up rate of 75%. The specific process was as follows: solution preparation → one dip and one nip → setting (180℃×60s) → rehydration. The irregularly shaped nylon fabrics treated in each group were evaluated.

[0040] The softness test was conducted by a professional judging panel of nine trained assessors under standard environmental conditions (temperature 20±2℃, relative humidity 65±2%). Each person touched and evaluated the material individually during the blind test to avoid cross-contamination. Softness was graded on a five-level scale, with level 1 being very firm and level 5 being very soft.

[0041] The elastic recovery rate was tested according to FZ / T 70006-2004 "Test Method for Tensile Elastic Recovery Rate of Knitted Fabrics". The water droplet diffusion time was tested according to GB / T 21655.1-2023 "Evaluation of Moisture Absorption and Quick-Drying Properties of Textiles - Part 1: Single Combination Test Method" to characterize hydrophilicity.

[0042] The program corresponding to Type A washing machine in GB / T 8629-2017 "Test Procedures for Household Washing and Drying of Textiles" was selected, and the detergent was standard detergent 3 specified in GB / T 8629-2017. After 10 washes, the softness, elastic recovery rate, and water droplet diffusion time were tested again.

[0043] like Figure 1 As shown, the softness grade of the irregular cross-section nylon fabric treated with the hydrophilic softening agent obtained in Example 5 is consistently the highest, significantly better than that of the comparative example.

[0044] like Figure 2 As shown, the nylon fabric with irregular cross-section treated with the hydrophilic softening agent obtained in Example 5 consistently exhibits the highest elastic recovery rate, significantly superior to the comparative example.

[0045] like Figure 3 As shown, the water diffusion time of the irregular cross-section nylon fabric treated with the hydrophilic softening agent obtained in Example 5 was consistently the shortest, significantly better than that of the comparative example.

[0046] The present invention has been described in detail above. Those skilled in the art will recognize that the invention can be practiced in a wide range of ways with equivalent parameters, concentrations, and conditions without departing from its spirit and scope, and without requiring unnecessary experiments. While specific embodiments have been provided, it should be understood that further modifications can be made to the invention. In summary, according to the principles of the invention, this application is intended to include any changes, uses, or improvements to the invention, including changes made using conventional techniques known in the art that depart from the scope disclosed herein.

Claims

1. A durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics, characterized in that, The raw materials, by weight, include: 10-15 parts adipic acid, 5-10 parts hexamethylenediamine, 1-5 parts amino-terminated polyamide amine, 10-30 parts polyetheramine 400, 0.1-0.5 parts catalyst A, 30-50 parts double-terminated epoxy polyether silicone oil, 1-5 parts polyetheramine 900, 0.1-1 part diethylenetriamine, 1.1-4 parts glacial acetic acid, 5-15 parts surfactant, 10-20 parts polyethylene glycol, 1-5 parts hexamethylene diisocyanate, 0.01-0.1 parts catalyst B, 1-5 parts 2-acrylamido-2-methylpropanesulfonic acid, 1-3 parts dicyandiamide, and 1-5 parts amino silicone oil.

2. The durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics according to claim 1, characterized in that, Catalyst A is p-toluenesulfonic acid.

3. The durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics according to claim 1, characterized in that, The surfactant is sodium dodecyl sulfate or / and fatty alcohol polyoxyethylene ether.

4. The durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics according to claim 1, characterized in that, The average molecular weight of polyethylene glycol is 400-800.

5. The durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics according to claim 1, characterized in that, Catalyst B is dibutyltin dilaurate.

6. The durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics according to claim 1, characterized in that, The nitrogen content of amino silicone oil is 0.37±0.05%.

7. A method for preparing a durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Under nitrogen protection, add adipic acid, hexamethylenediamine, amino-terminated polyamide amine, polyether amine 400, and catalyst A to the reactor. Stir at 150-170℃ for 1-2 hours, vacuum polycondense at 20-60kPa for 10-30 minutes, and cool to obtain preform a. S2. Add double-ended epoxy polyether silicone oil, polyetheramine 900, diethylenetriamine, and glacial acetic acid to the solvent, stir at 80-90℃ for 5-15h, remove the solvent by vacuum distillation, add surfactant, glacial acetic acid, and water, homogenize for 10-30min at a homogenization temperature of 50-60℃, and obtain preform b. S3. Add hexamethylene diisocyanate to polyethylene glycol and stir until uniform. Add catalyst B and stir at 50-60℃ for 3-6 hours. Cool down to 30-40℃ and add 2-acrylamido-2-methylpropanesulfonic acid while stirring. Stir for 1-2 hours and then heat up to 70-80℃ and stir for 2-4 hours to obtain preform c. S4. Add preform a, preform b, dicyandiamide, and amino silicone oil to preform c and stir until homogeneous.

8. The method for preparing the durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics according to claim 7, characterized in that, In S2, the mass ratio of glacial acetic acid added together with the double-ended epoxy polyether silicone oil is: x The mass ratio of glacial acetic acid added together with the surfactant is... y , x ÷ y =0.1-1:1-3.

9. The method for preparing the durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics according to claim 7, characterized in that, In S2, the solvent is at least one of methanol, isopropanol, and ethylene glycol monobutyl ether.

10. The method for preparing the durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics according to claim 7, characterized in that, In S2, the homogenization rate is 1000-2000 r / min.

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