High-flexibility suit overcoat fabric and its weaving process

Abstract

This invention relates to the field of fabric technology, specifically to a highly flexible suit coat fabric and its textile process. The fabric comprises a 2 / 2 twill cotton greige fabric and a flexible finishing layer fixed to the surface of the cotton fibers. The flexible finishing layer is formed by sequentially padding and pre-drying the greige fabric, which has undergone limited pretreatment with cellulase, with a first surface finishing solution of aldehyde-modified amylopectin / D-glucosamine hydrochloride, followed by coupling with a 3-aminopropyltriethoxysilane surface coupling solution, and a final finishing with D-glucosamine hydrochloride. The weight-average molecular weight of the aldehyde-modified amylopectin is 2.50 × 10⁻⁶. 5 -4.50×10 5 The degree of aldehyde substitution is 3.0%–7.0%. This invention enables the fabric to possess softness, washability and softness retention, tensile strength retention, breathability and moisture diffusion properties without the addition of formaldehyde resin finishing agent, making it suitable for clothing fabrics such as suits and overcoats.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, and in particular to a highly flexible suit coat fabric and its textile process. Background Technology

[0002] As a mainstream clothing category in autumn and winter, suit coats have strict requirements for the softness, drape, washability, tensile strength, and breathability of the fabric. Cotton fabrics are a common choice for suit coats due to their natural skin-friendliness, good moisture absorption, and cost-effectiveness. However, untreated cotton fabrics tend to be stiff, lack drape, and are prone to hardening and clumping after repeated washing, making it difficult to meet the quality requirements of high-end suit coats.

[0003] To address these shortcomings, the industry employs various chemical or biological finishing techniques to modify cotton fabrics. However, existing finishing technologies generally suffer from limitations, with some aspects being neglected while others are addressed. For example, while traditional formaldehyde resin finishing can improve the wrinkle resistance and washability of fabrics, it releases free formaldehyde, which does not meet current environmental protection and consumer product safety requirements. When using ordinary starch or oxidized polysaccharides for formaldehyde-free finishing, the lack of precise control over the molecular weight of the polysaccharides and the degree of aldehyde substitution can easily lead to an excessively thick finishing layer, a stiff hand feel, or insufficient washability.

[0004] While cellulase biopolishing can improve the feel of cotton fabrics to some extent by removing fuzz from the fiber surface, over-treatment can significantly reduce the strength of cotton fibers, and it cannot achieve a long-lasting soft and washable effect when used alone. Although aminosilane coupling agent treatment can improve the surface properties of cotton fabrics, it can easily lead to problems such as insufficient washability and reduced breathability when used alone or improperly combined with other finishing agents.

[0005] Existing technologies mostly focus on optimizing a single aspect such as hydrophilicity, wrinkle resistance, softness, strength, or washability, without forming a synergistic effect across multiple aspects. This makes it difficult to simultaneously meet the comprehensive balance requirements of cotton fabrics for suits and overcoats in terms of softness, washability and softness retention, tensile strength, breathability, and moisture absorption and diffusion, thus limiting their application in the high-end suit and overcoat sector. Summary of the Invention

[0006] The purpose of this invention is to propose a highly flexible suit coat fabric and its textile process to solve the problem that existing cotton fabric finishing for suit coats focuses on a single property and is difficult to simultaneously meet the comprehensive balance requirements of softness, washability and softness retention, tensile strength, breathability and moisture absorption and diffusion.

[0007] To achieve the above objectives, the present invention provides a highly flexible suit coat fabric, comprising a cotton greige fabric and a flexible finishing layer fixed to the surface of the cotton greige fabric fibers. The cotton greige fabric is a 2 / 2 twill cotton greige fabric woven from 36S / 2-50S / 2 combed cotton double-ply yarn as warp and weft yarns.

[0008] The flexible finishing layer is formed on the surface of the cotton fabric fibers pretreated with cellulase, and is formed by padding and pre-drying with a first surface finishing liquid, post-coupling with a 3-aminopropyltriethoxysilane surface coupling liquid, and post-finishing with a finishing liquid.

[0009] Based on 5000 parts by weight of the cotton greige fabric, the effective components forming the flexible finishing layer include: 450-750 parts by weight of aldehyde-modified amylopectin, 8-18 parts by weight of the first part D-glucosamine hydrochloride, 40-90 parts by weight of 3-aminopropyltriethoxysilane, and 12-25 parts by weight of the second part D-glucosamine hydrochloride.

[0010] The first portion of D-glucosamine hydrochloride is added with the first surface finishing solution, the 3-aminopropyltriethoxysilane is added with the 3-aminopropyltriethoxysilane surface coupling solution, and the second portion of D-glucosamine hydrochloride is added with the post-finishing solution.

[0011] The pre-drying endpoint after the first surface finishing solution is 5600-6100 parts by weight of the fabric.

[0012] The weight-average molecular weight of the aldehyde-modified amylopectin is 2.50 × 10⁻⁶. 5 -4.50×10 5 The degree of aldehyde substitution of the aldehyde-modified amylopectin is 3.0%-7.0%, and the degree of aldehyde substitution is based on the proportion of oxidized glucose structural units to the total number of glucose structural units.

[0013] The aldehyde-modified amylopectin is obtained by oxidizing low molecular weight amylopectin with sodium periodate in the presence of sodium tetraborate decahydrate.

[0014] Furthermore, the warp yarn density of the cotton fabric is 390-460 yarns / 10cm, and the weft yarn density is 300-360 yarns / 10cm.

[0015] Furthermore, the cotton fabric is subjected to an alkali boiling treatment before cellulase pretreatment; based on 5000 parts by weight of the cotton fabric, the alkali boiling treatment includes: adding the cotton fabric to a treatment solution containing 90000-120000 parts by weight of deionized water, 260-400 parts by weight of anhydrous sodium carbonate and 80-130 parts by weight of sodium dodecylbenzenesulfonate, keeping it at 88-95°C for 25-40 minutes, followed by washing and dehydration until the fabric weight is 6500 parts by weight.

[0016] Furthermore, based on 5000 parts by weight of the cotton greige fabric, the cellulase pretreatment includes: adding 72000-85000 parts by weight of deionized water, 330-450 parts by weight of sodium acetate trihydrate, 75-110 parts by weight of glacial acetic acid, and 18-35 parts by weight of cellulase working solution with an activity of 10000 U / mL to the treatment tank, then adding the cotton greige fabric, and treating at 52-58℃ for 15-25 min; after the treatment, raising the temperature to 90-92℃ and holding for 5-6 min to inactivate the cellulase; then washing and dehydrating to a fabric weight of 6500 parts by weight.

[0017] Furthermore, the low molecular weight amylopectin is obtained by acid hydrolysis degradation of amylopectin; based on 700-900 parts by weight of amylopectin, the acid hydrolysis degradation includes: adding the amylopectin to 14,000-18,000 parts by weight of deionized water, stirring at 90°C for 35-50 minutes, cooling to 55-65°C, adding 450-750 parts by weight of a 10% hydrochloric acid aqueous solution, and maintaining the temperature for 30-50 minutes; subsequently adding a sodium carbonate aqueous solution prepared from 75-110 parts by weight of anhydrous sodium carbonate and 750-1100 parts by weight of deionized water, and then adding 33,000-42,000 parts by weight of 95% ethanol, followed by precipitation, filtration, washing, and drying to obtain the low molecular weight amylopectin. The preparation of the aldehyde-modified amylopectin includes: taking 550-650 parts by weight of the low molecular weight amylopectin and adding it to 11,000-13,000 parts by weight of deionized water, stirring at 80°C for 30 min, and then cooling to 20°C; adding 5-12 parts by weight of sodium tetraborate decahydrate and stirring for 20 min; adding an aqueous solution of sodium periodate prepared from 25-60 parts by weight of sodium periodate and 1,500-2,500 parts by weight of deionized water under light-protected conditions, with an addition time of 30 min; after the addition is completed, continuing the reaction at 20°C for 70-110 min; then adding 45-75 parts by weight of ethylene glycol and stirring for 15 min to terminate the oxidation reaction, followed by ethanol precipitation, filtration, washing and drying to obtain the aldehyde-modified amylopectin.

[0018] Furthermore, based on 5000 parts by weight of the cotton greige fabric, the first surface finishing solution is prepared from 56000-65000 parts by weight of deionized water, 450-750 parts by weight of the aldehyde-modified amylopectin, 8-18 parts by weight of the first portion of D-glucosamine hydrochloride, 260-350 parts by weight of sodium acetate trihydrate and 60-100 parts by weight of glacial acetic acid.

[0019] Furthermore, the preparation of the first surface finishing solution includes: stirring deionized water, aldehyde-modified branched starch, first part D-glucosamine hydrochloride, sodium acetate trihydrate and glacial acetic acid at 48-55℃ for 25-35 min and then cooling to 30℃; the padding of the first surface finishing solution includes: adding the cotton fabric pretreated with cellulase into the first surface finishing solution, immersing at 30℃ for 3-4 min, followed by two dips and two paddings, with the padding rate controlled at 60%-80%, and then pre-drying in hot air at 80℃ to 5600-6100 parts by weight of the fabric.

[0020] Furthermore, based on 5000 parts by weight of the cotton greige fabric, the 3-aminopropyltriethoxysilane surface coupling solution is prepared from 9000-12000 parts by weight of deionized water, 40-90 parts by weight of 3-aminopropyltriethoxysilane, 22-40 parts by weight of glacial acetic acid, 80-120 parts by weight of sodium acetate trihydrate, and 25000-35000 parts by weight of deionized water for dilution; the post-coupling includes: adding the fabric that has been impregnated and pre-dried by the first surface finishing solution into the 3-aminopropyltriethoxysilane surface coupling solution, impregnating it at 25°C for 2-3 minutes, then impregnating and padding it once, with the padding rate controlled at 25%-45%, then drying it in hot air at 90-95°C for 3-4 minutes, and then baking it at 110-130°C for 3-5 minutes.

[0021] Furthermore, based on 5000 parts by weight of the cotton greige fabric, the finishing solution is prepared from 35000-45000 parts by weight of deionized water, 12-25 parts by weight of the second part D-glucosamine hydrochloride, 160-240 parts by weight of sodium acetate trihydrate and 30-55 parts by weight of glacial acetic acid; the finishing process includes: adding the post-coupled fabric to the finishing solution, immersing for 2 minutes and then padding once and once, controlling the padding rate to 50%-70%, then drying at 80°C for 5 minutes, washing twice with deionized water at 40°C, dehydrating and drying at 80°C until the fabric moisture content is not higher than 8%.

[0022] This invention also provides a textile process for a highly flexible suit coat fabric, comprising the following steps:

[0023] (1) Take 36S / 2-50S / 2 combed cotton double-ply yarn as warp yarn and 36S / 2-50S / 2 combed cotton double-ply yarn as weft yarn, and weave cotton fabric using 2 / 2 twill weave.

[0024] (2) The cotton fabric is subjected to alkali boiling, washing and dehydration;

[0025] (3) The cotton fabric obtained in step (2) is pretreated with cellulase and the cellulase is deactivated. After washing, it is dehydrated.

[0026] (4) Amylopectin is degraded by acid hydrolysis to obtain low molecular weight amylopectin;

[0027] (5) The low molecular weight amylopectin is oxidized with sodium periodate in the presence of sodium tetraborate decahydrate to obtain aldehyde-modified amylopectin.

[0028] (6) Deionized water, the aldehyde-modified amylopectin, the first part of D-glucosamine hydrochloride, sodium acetate trihydrate and glacial acetic acid are mixed to obtain the first surface finishing solution;

[0029] (7) The cotton fabric obtained in step (3) is immersed in the first surface finishing solution, then dipped and rubbed twice, and pre-dried until the fabric weight is 112%-122% of the initial weight of the cotton fabric;

[0030] (8) Mix 3-aminopropyltriethoxysilane, glacial acetic acid, sodium acetate trihydrate and deionized water to obtain 3-aminopropyltriethoxysilane surface coupling solution;

[0031] (9) The pre-dried fabric from step (7) is immersed in the 3-aminopropyltriethoxysilane surface coupling solution, followed by one dip and one roll, drying and baking;

[0032] (10) Mix deionized water, the second part D-glucosamine hydrochloride, sodium acetate trihydrate and glacial acetic acid to obtain the finishing solution;

[0033] (11) The fabric obtained in step (9) is immersed in the finishing liquid, then dipped and rolled, dried, washed, dehydrated and dried to obtain the high-flexibility suit coat fabric.

[0034] The beneficial effects of this invention are:

[0035] (1) This invention achieves a balance between softness and washability of fabric by precisely controlling the weight-average molecular weight and degree of aldehyde substitution of aldehyde-modified amylopectin, combined with multi-step synergistic effects such as sodium tetraborate decahydrate pre-complexation, limited cellulase treatment, segmented addition of D-glucosamine hydrochloride, post-coupling of 3-aminopropyltriethoxysilane and pre-drying quality endpoint control.

[0036] (2) The present invention takes into account the synergistic optimization of strength and breathability: the breaking strength retention rate of Example 1 reaches 94.6% and the breathability reaches 126.8mm / s, which not only avoids the loss of strength caused by excessive cellulase treatment, but also prevents the finishing layer from clogging the fabric pores due to excessive thickness; at the same time, the moisture absorption and diffusion performance is excellent, the water droplet diffusion time is only 2.8s, and the moisture regain is stable at 7.9%-8.8%, which meets the comfort requirements when wearing a suit coat. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0038] The main raw materials used are as follows: 40S / 2 combed cotton double-ply yarn, sourced from 100% cotton double-ply yarn within the regular colored yarn product range of Huafu Fashion Co., Ltd.; amylopectin, sourced from THIAI (Shanghai) Chemical Industry Development Co., Ltd., product code A0456, name amylopectin, CAS number 9037-22-3; cellulase, sourced from Shandong Sukehan Bioengineering Co., Ltd., model SUKACell-CON concentrated acidic enzyme water, calibrated to 10000U / mL cellulase working solution according to CMCA-DNS method before use.

[0039] Example 1:

[0040] Step 1: Take 40S / 2 combed cotton double-ply yarn as the warp yarn and 40S / 2 combed cotton double-ply yarn as the weft yarn. The warp yarn density is 420 ends / 10cm, and the weft yarn density is 320 ends / 10cm. The weave structure is 2 / 2 twill. Weave it into a greige fabric with a width of 150cm for a suit coat. Cut 5000g from the obtained greige fabric as a sample for subsequent processing.

[0041] Step 2: Add 100,000g of deionized water, 300g of anhydrous sodium carbonate and 100g of sodium dodecylbenzenesulfonate to the treatment tank, heat to 90℃ and add 5,000g of the greige fabric obtained in Step 1, keep warm for 30 minutes; then drain the liquid, add 80,000g of deionized water and wash at 60℃ for 10 minutes, then add another 80,000g of deionized water and wash at 30℃ for 10 minutes, dehydrate until the fabric weight is 6,500g;

[0042] Step 3: Add 75,000 g of deionized water, 375 g of sodium acetate trihydrate, and 95 g of glacial acetic acid to the treatment tank. After stirring for 10 min, add 25 g of cellulase working solution with an activity of 10,000 U / mL, then add the greige fabric obtained in Step 2. Treat at 55℃ for 20 min. After treatment, raise the temperature to 90℃ and keep it at that temperature for 5 min to inactivate the cellulase. Then drain the liquid, add 80,000 g of deionized water, wash at 40℃ for 10 min, and dehydrate until the fabric weight is 6,500 g.

[0043] Step 4: Add 16000g of deionized water and 800g of amylopectin to the reactor, heat to 90℃ and stir for 40min to gelatinize and disperse the amylopectin; after cooling to 60℃, add 600g of 10% hydrochloric acid aqueous solution and keep warm for 40min; then add sodium carbonate aqueous solution prepared by 90g of anhydrous sodium carbonate and 900g of deionized water over 20min under stirring; then add 36000g of 95% ethanol, stir for 20min and filter. Wash the filter cake twice with 12000g of 75% ethanol and dry at 45℃ until the difference between two consecutive weighings does not exceed 5g to obtain low molecular weight amylopectin.

[0044] Step 5: Take 600g of the low molecular weight amylopectin obtained in Step 4, add it to 12000g of deionized water, stir at 80℃ for 30min, then cool to 20℃; add 8g of sodium tetraborate decahydrate and stir for 20min to allow some of the vicinal diol structures on the amylopectin segments to form reversible complexes; add an aqueous solution of sodium periodate prepared from 40g of sodium periodate and 2000g of deionized water under light-protected conditions, controlling the addition time to 30min, and continue the reaction at 20℃ for 90min after the addition is complete; then add 60g of ethylene glycol and stir for 15min to terminate the oxidation reaction, then add 42000g of 95% ethanol, stir for 20min, filter, wash the filter cake three times with 12000g of 75% ethanol, and dry at 45℃ until the difference between two consecutive weighings does not exceed 5g, to obtain aldehyde-modified amylopectin. The weight-average molecular weight of the obtained aldehyde-modified amylopectin was determined to be 3.31×10⁻⁶ by gel permeation chromatography. 5 The degree of aldehyde substitution, determined by hydroxylamine hydrochloride titration, was 5.2% based on the proportion of oxidized glucose structural units to the total number of glucose structural units.

[0045] Step 6: Add 60,000 g of deionized water, 600 g of aldehyde-modified amylopectin obtained in Step 5, 12 g of D-glucosamine hydrochloride, 300 g of sodium acetate trihydrate and 80 g of glacial acetic acid to the solution tank, stir at 50°C for 30 min and then cool to 30°C to obtain the first surface finishing solution.

[0046] Step 7: Add the greige fabric obtained in Step 3 to the first surface finishing solution obtained in Step 6, immerse at 30℃ for 3 minutes, then immerse and rub twice, with the roll-off rate controlled at 70%, and pre-dry the rubbed fabric in hot air at 80℃, with the pre-drying endpoint controlled at a fabric weight of 5800g.

[0047] Step 8: Add 10,000 g of deionized water, 60 g of 3-aminopropyltriethoxysilane, 30 g of glacial acetic acid and 100 g of sodium acetate trihydrate to the mixing tank, stir at 25 °C for 40 min, then add 30,000 g of deionized water to dilute and stir for 10 min to obtain the pre-hydrolyzed 3-aminopropyltriethoxysilane surface coupling solution;

[0048] Step 9: Add the pre-dried fabric from Step 7 to the surface coupling solution obtained in Step 8, immerse it at 25°C for 2 minutes, then immerse and roll it once, with the roll-off rate controlled at 35%, dry the fabric in hot air at 90°C for 3 minutes, and then bake it at 120°C for 3 minutes.

[0049] Step 10: Add 40,000g of deionized water, 18g of D-glucosamine hydrochloride, 200g of sodium acetate trihydrate and 40g of glacial acetic acid to the mixing tank, stir at 30℃ for 10 minutes, add the fabric obtained in Step 9, soak for 2 minutes and perform one soak and one pad, control the padding rate to 60%, then dry at 80℃ for 5 minutes, then wash with 60,000g of deionized water at 40℃ for 10 minutes, repeat the washing twice, dehydrate and dry at 80℃ until the fabric moisture content is no higher than 8%, to obtain the high-flexibility suit coat fabric.

[0050] Example 2:

[0051] Step 1: Take 36S / 2 combed cotton double-ply yarn as the warp yarn and 36S / 2 combed cotton double-ply yarn as the weft yarn. The warp yarn density is 390 ends / 10cm, and the weft yarn density is 300 ends / 10cm. The weave structure is 2 / 2 twill. Weave it into a greige fabric with a width of 150cm for a suit coat. Cut 5000g from the obtained greige fabric as a sample for subsequent processing.

[0052] Step 2: Add 90,000g of deionized water, 260g of anhydrous sodium carbonate and 80g of sodium dodecylbenzenesulfonate to the treatment tank, heat to 88℃ and add 5,000g of the greige fabric obtained in Step 1, keep warm for 25 minutes; then drain the liquid, add 80,000g of deionized water and wash at 60℃ for 10 minutes, then add another 80,000g of deionized water and wash at 30℃ for 10 minutes, dehydrate until the fabric weight is 6,500g;

[0053] Step 3: Add 72,000 g of deionized water, 330 g of sodium acetate trihydrate, and 75 g of glacial acetic acid to the treatment tank. After stirring for 10 min, add 18 g of cellulase working solution with an activity of 10,000 U / mL, and then add the greige fabric obtained in Step 2. Treat at 52℃ for 15 min. After treatment, raise the temperature to 90℃ and keep it at that temperature for 5 min to inactivate the cellulase. Then drain the liquid, add 80,000 g of deionized water, wash at 40℃ for 10 min, and dehydrate until the fabric weight is 6,500 g.

[0054] Step 4: Add 14,000 g of deionized water and 700 g of amylopectin to the reactor, heat to 90°C and stir for 35 min to gelatinize and disperse the amylopectin; after cooling to 65°C, add 750 g of 10% hydrochloric acid aqueous solution and keep warm for 50 min; then, under stirring, add sodium carbonate aqueous solution prepared from 110 g of anhydrous sodium carbonate and 1100 g of deionized water over 20 min; then add 33,000 g of 95% ethanol, stir for 20 min and filter. Wash the filter cake twice with 10,000 g of 75% ethanol and dry at 45°C until the difference between two consecutive weighings does not exceed 5 g to obtain low molecular weight amylopectin.

[0055] Step 5: Take 550g of the low molecular weight amylopectin obtained in Step 4, add it to 11000g of deionized water, stir at 80℃ for 30min, then cool to 20℃; add 5g of sodium tetraborate decahydrate and stir for 20min; under light-protected conditions, add an aqueous solution of sodium periodate prepared from 25g of sodium periodate and 1500g of deionized water, controlling the addition time to 30min, and continue the reaction at 20℃ for 70min after the addition is complete; then add 45g of ethylene glycol and stir for 15min to terminate the oxidation reaction, then add 38000g of 95% ethanol, stir for 20min, filter, wash the filter cake three times with 10000g of 75% ethanol, and dry at 45℃ until the difference between two consecutive weighings does not exceed 5g, to obtain aldehyde-modified amylopectin. The weight-average molecular weight of the obtained aldehyde-modified amylopectin was determined to be 2.57×10⁻⁶ by gel permeation chromatography. 5 The degree of aldehyde substitution, determined by hydroxylamine hydrochloride titration, was 3.3% based on the proportion of oxidized glucose structural units to the total number of glucose structural units.

[0056] Step 6: Add 56,000 g of deionized water, 450 g of aldehyde-modified amylopectin obtained in Step 5, 8 g of D-glucosamine hydrochloride, 260 g of sodium acetate trihydrate and 60 g of glacial acetic acid to the preparation tank, stir at 48°C for 25 min and then cool to 30°C to obtain the first surface finishing solution.

[0057] Step 7: Add the greige fabric obtained in Step 3 to the first surface finishing solution obtained in Step 6, immerse at 30℃ for 3 minutes, then immerse and rub twice, with the roll-off rate controlled at 60%, and pre-dry the rubbed fabric in hot air at 80℃, with the pre-drying endpoint controlled at a fabric weight of 6100g.

[0058] Step 8: Add 9000g of deionized water, 40g of 3-aminopropyltriethoxysilane, 22g of glacial acetic acid and 80g of sodium acetate trihydrate to the mixing tank, stir at 25℃ for 35min, then add 25000g of deionized water to dilute and stir for 10min to obtain the pre-hydrolyzed 3-aminopropyltriethoxysilane surface coupling solution;

[0059] Step 9: Add the pre-dried fabric from Step 7 to the surface coupling solution obtained in Step 8, immerse it at 25°C for 2 minutes, then immerse and roll it once, with the roll-off rate controlled at 25%, dry the fabric in hot air at 90°C for 3 minutes, and then bake it at 110°C for 3 minutes.

[0060] Step 10: Add 35,000g of deionized water, 12g of D-glucosamine hydrochloride, 160g of sodium acetate trihydrate and 30g of glacial acetic acid to the mixing tank, stir at 30℃ for 10 minutes, add the fabric obtained in Step 9, soak for 2 minutes and perform one soak and one pad, control the padding rate to 50%, then dry at 80℃ for 5 minutes, then wash with 60,000g of deionized water at 40℃ for 10 minutes, repeat the washing twice, dehydrate and dry at 80℃ until the fabric moisture content is no higher than 8%, to obtain the high-flexibility suit coat fabric.

[0061] Example 3:

[0062] Step 1: Take 50S / 2 combed cotton double-ply yarn as the warp yarn and 50S / 2 combed cotton double-ply yarn as the weft yarn. The warp yarn density is 460 ends / 10cm, and the weft yarn density is 360 ends / 10cm. The weave structure is 2 / 2 twill. Weave it into a greige fabric with a width of 150cm for a suit coat. Cut 5000g from the obtained greige fabric as a sample for subsequent processing.

[0063] Step 2: Add 120,000g of deionized water, 400g of anhydrous sodium carbonate and 130g of sodium dodecylbenzenesulfonate to the treatment tank, heat to 95℃ and add 5,000g of the greige fabric obtained in Step 1, keep warm for 40 minutes; then drain the liquid, add 80,000g of deionized water and wash at 60℃ for 10 minutes, then add another 80,000g of deionized water and wash at 30℃ for 10 minutes, dehydrate until the fabric weight is 6,500g;

[0064] Step 3: Add 85,000 g of deionized water, 450 g of sodium acetate trihydrate, and 110 g of glacial acetic acid to the treatment tank. After stirring for 10 min, add 35 g of cellulase working solution with an activity of 10,000 U / mL, and then add the greige fabric obtained in Step 2. Treat at 58℃ for 25 min. After treatment, raise the temperature to 92℃ and keep it at that temperature for 6 min to inactivate the cellulase. Then drain the liquid, add 80,000 g of deionized water, wash at 40℃ for 10 min, and dehydrate until the fabric weight is 6,500 g.

[0065] Step 4: Add 18,000 g of deionized water and 900 g of amylopectin to the reactor, heat to 90°C and stir for 50 min to gelatinize and disperse the amylopectin; after cooling to 55°C, add 450 g of 10% hydrochloric acid aqueous solution and keep warm for 30 min; then, under stirring, add sodium carbonate aqueous solution prepared from 75 g of anhydrous sodium carbonate and 750 g of deionized water over 20 min; then add 42,000 g of 95% ethanol, stir for 20 min and filter. Wash the filter cake twice with 14,000 g of 75% ethanol and dry at 45°C until the difference between two consecutive weighings does not exceed 5 g to obtain low molecular weight amylopectin.

[0066] Step 5: Take 650g of the low molecular weight amylopectin obtained in Step 4, add it to 13000g of deionized water, stir at 80℃ for 30min, then cool to 20℃; add 12g of sodium tetraborate decahydrate and stir for 20min; under light-protected conditions, add an aqueous solution of sodium periodate prepared from 60g of sodium periodate and 2500g of deionized water, controlling the addition time to 30min, and continue the reaction at 20℃ for 110min after the addition is complete; then add 75g of ethylene glycol and stir for 15min to terminate the oxidation reaction, then add 46000g of 95% ethanol, stir for 20min, filter, wash the filter cake three times with 14000g of 75% ethanol, and dry at 45℃ until the difference between two consecutive weighings does not exceed 5g, to obtain aldehyde-modified amylopectin. The weight-average molecular weight of the obtained aldehyde-modified amylopectin was determined to be 4.43×10⁻⁶ by gel permeation chromatography. 5 The degree of aldehyde substitution, determined by hydroxylamine hydrochloride titration, was 6.8% based on the proportion of oxidized glucose structural units to the total number of glucose structural units.

[0067] Step 6: Add 65,000 g of deionized water, 750 g of aldehyde-modified amylopectin obtained in Step 5, 18 g of D-glucosamine hydrochloride, 350 g of sodium acetate trihydrate and 100 g of glacial acetic acid to the solution tank, stir at 55°C for 35 min and then cool to 30°C to obtain the first surface finishing solution.

[0068] Step 7: Add the greige fabric obtained in Step 3 to the first surface finishing solution obtained in Step 6, immerse at 30℃ for 4 minutes, then immerse and rub twice, with the roll-off rate controlled at 80%, and pre-dry the rubbed fabric in hot air at 80℃, with the pre-drying endpoint controlled at a fabric weight of 5600g.

[0069] Step 8: Add 12000g deionized water, 90g 3-aminopropyltriethoxysilane, 40g glacial acetic acid and 120g sodium acetate trihydrate to the solution tank, stir at 25℃ for 50min, then add 35000g deionized water to dilute and stir for 10min to obtain the pre-hydrolyzed 3-aminopropyltriethoxysilane surface coupling solution;

[0070] Step 9: Add the pre-dried fabric from Step 7 to the surface coupling solution obtained in Step 8, immerse it at 25°C for 3 minutes, then immerse and roll it once, with the roll-off rate controlled at 45%, dry the fabric in hot air at 95°C for 4 minutes, and then bake it at 130°C for 5 minutes.

[0071] Step 10: Add 45,000g of deionized water, 25g of D-glucosamine hydrochloride, 240g of sodium acetate trihydrate and 55g of glacial acetic acid to the mixing tank, stir at 30℃ for 10 minutes, add the fabric obtained in Step 9, soak for 2 minutes and perform one soak and one pad, control the padding rate to 70%, then dry at 80℃ for 5 minutes, then wash with 60,000g of deionized water at 40℃ for 10 minutes, repeat the washing twice, dehydrate and dry at 80℃ until the fabric moisture content is no higher than 8%, to obtain the high-flexibility suit coat fabric.

[0072] Example 4:

[0073] Step 1: Take 40S / 2 combed cotton double-ply yarn as the warp yarn and 40S / 2 combed cotton double-ply yarn as the weft yarn. The warp yarn density is 430 ends / 10cm, and the weft yarn density is 340 ends / 10cm. The weave structure is 2 / 2 twill. Weave it into a greige fabric with a width of 150cm for a suit coat. Cut 5000g from the obtained greige fabric as a sample for subsequent processing.

[0074] Step 2: Add 100,000g of deionized water, 330g of anhydrous sodium carbonate and 110g of sodium dodecylbenzenesulfonate to the treatment tank, heat to 90℃ and add 5,000g of the greige fabric obtained in Step 1, keep warm for 35 minutes; then drain the liquid, add 80,000g of deionized water and wash at 60℃ for 10 minutes, then add another 80,000g of deionized water and wash at 30℃ for 10 minutes, dehydrate until the fabric weight is 6,500g;

[0075] Step 3: Add 78,000 g of deionized water, 390 g of sodium acetate trihydrate, and 90 g of glacial acetic acid to the treatment tank. After stirring for 10 min, add 28 g of cellulase working solution with an activity of 10,000 U / mL, then add the greige fabric obtained in Step 2. Treat at 55℃ for 22 min. After treatment, raise the temperature to 90℃ and keep it at that temperature for 5 min to inactivate the cellulase. Then drain the liquid, add 80,000 g of deionized water, wash at 40℃ for 10 min, and dehydrate until the fabric weight is 6,500 g.

[0076] Step 4: Add 16000g of deionized water and 800g of amylopectin to the reactor, heat to 90℃ and stir for 40min to gelatinize and disperse the amylopectin; after cooling to 60℃, add 580g of 10% hydrochloric acid aqueous solution and keep warm for 38min; then add sodium carbonate aqueous solution prepared by 90g of anhydrous sodium carbonate and 900g of deionized water over 20min under stirring; then add 36000g of 95% ethanol, stir for 20min and filter. Wash the filter cake twice with 12000g of 75% ethanol and dry at 45℃ until the difference between two consecutive weighings does not exceed 5g to obtain low molecular weight amylopectin.

[0077] Step 5: Take 600g of the low molecular weight amylopectin obtained in Step 4, add it to 12000g of deionized water, stir at 80℃ for 30min, then cool to 20℃; add 9g of sodium tetraborate decahydrate and stir for 20min; under light-protected conditions, add an aqueous solution of sodium periodate prepared from 48g of sodium periodate and 2200g of deionized water, controlling the addition time to 30min, and continue the reaction at 20℃ for 95min after the addition is complete; then add 65g of ethylene glycol and stir for 15min to terminate the oxidation reaction, then add 42000g of 95% ethanol, stir for 20min, filter, wash the filter cake three times with 12000g of 75% ethanol, and dry at 45℃ until the difference between two consecutive weighings does not exceed 5g, to obtain aldehyde-modified amylopectin. The weight-average molecular weight of the obtained aldehyde-modified amylopectin was determined to be 3.74×10⁻⁶ by gel permeation chromatography. 5 The degree of aldehyde substitution, determined by hydroxylamine hydrochloride titration, was 5.9% based on the proportion of oxidized glucose structural units to the total number of glucose structural units.

[0078] Step 6: Add 60,000 g of deionized water, 650 g of aldehyde-modified amylopectin obtained in Step 5, 14 g of D-glucosamine hydrochloride, 320 g of sodium acetate trihydrate and 90 g of glacial acetic acid to the solution tank, stir at 52°C for 30 min and then cool to 30°C to obtain the first surface finishing solution.

[0079] Step 7: Add the greige fabric obtained in Step 3 to the first surface finishing solution obtained in Step 6, immerse at 30℃ for 3 minutes, then immerse and rub twice, with the roll-off rate controlled at 70%, and pre-dry the rubbed fabric in hot air at 80℃, with the pre-drying endpoint controlled at a fabric weight of 5900g.

[0080] Step 8: Add 10,000 g of deionized water, 70 g of 3-aminopropyltriethoxysilane, 32 g of glacial acetic acid and 110 g of sodium acetate trihydrate to the mixing tank, stir at 25 °C for 45 min, then add 30,000 g of deionized water to dilute and stir for 10 min to obtain the pre-hydrolyzed 3-aminopropyltriethoxysilane surface coupling solution;

[0081] Step 9: Add the pre-dried fabric from Step 7 to the surface coupling solution obtained in Step 8, immerse it at 25°C for 2 minutes, then immerse and roll it once, with the roll-off rate controlled at 38%, dry the fabric in hot air at 90°C for 4 minutes, and then bake it at 120°C for 4 minutes.

[0082] Step 10: Add 40,000g of deionized water, 20g of D-glucosamine hydrochloride, 220g of sodium acetate trihydrate and 45g of glacial acetic acid to the mixing tank, stir at 30℃ for 10min, add the fabric obtained in Step 9, soak for 2min and then roll once and once, with the roll-off rate controlled at 60%, then dry at 80℃ for 5min, then wash with 60,000g of deionized water at 40℃ for 10min, repeat the washing twice, dehydrate and dry at 80℃ until the fabric moisture content is no higher than 8%, to obtain the high-flexibility suit coat fabric.

[0083] Comparative Example 1:

[0084] The difference from Example 1 is that step four does not involve acid hydrolysis degradation, and step five directly adds 600g of amylopectin to 12000g of deionized water for subsequent sodium tetraborate decahydrate pre-complexation and sodium periodate oxidation treatment. The resulting aldehyde-modified amylopectin was found to have a weight-average molecular weight of 8.60 × 10⁻⁶ by gel permeation chromatography. 5 The degree of aldehyde substitution was 5.1%; the other conditions were the same as in Example 1.

[0085] Comparative Example 2:

[0086] The difference from Example 1 is that the amount of sodium periodate in step five was adjusted from 40g to 18g, and the degree of aldehyde substitution of the aldehyde-modified amylopectin was 2.1%, with a weight-average molecular weight of 3.62×10^5; the other conditions were the same as in Example 1.

[0087] Comparative Example 3:

[0088] The difference from Example 1 is that the amount of sodium periodate in step five was adjusted from 40g to 80g, resulting in an aldehyde substitution degree of 9.4% and a weight-average molecular weight of 2.86 × 10⁻⁶. 5 The remaining conditions are the same as in Example 1.

[0089] Comparative Example 4:

[0090] The difference from Example 1 is that 8g of sodium tetraborate decahydrate is not added in step five; to eliminate the influence of the difference in the degree of aldehyde substitution, the degree of aldehyde substitution is monitored by titration with hydroxylamine hydrochloride during the reaction, and ethylene glycol is added to terminate the reaction when the degree of aldehyde substitution reaches 5.0±0.3%; the remaining post-treatment and fabric finishing conditions are the same as in Example 1.

[0091] Comparative Example 5:

[0092] The difference from Example 1 is that in step three, instead of adding 25g of cellulase working solution with an activity of 10000U / mL, 25g of deionized water is added. The amounts of sodium acetate trihydrate, glacial acetic acid, treatment temperature, treatment time, temperature inactivation, washing and dehydration conditions in step three remain unchanged; the other conditions are the same as in Example 1.

[0093] Comparative Example 6:

[0094] The difference from Example 1 is that 12g of D-glucosamine hydrochloride is not added in step six, and the amount of D-glucosamine hydrochloride in step ten is adjusted from 18g to 30g, so that the total amount of D-glucosamine hydrochloride added is still 30g; the other conditions are the same as in Example 1.

[0095] Comparative Example 7:

[0096] The difference from Example 1 is that 60g of 3-aminopropyltriethoxysilane is not added in step eight, but instead an equal mass of deionized water is added; the amounts of glacial acetic acid and sodium acetate trihydrate in step eight, as well as the stirring, dilution, padding, drying and baking conditions, remain unchanged; the other conditions are the same as in Example 1.

[0097] Comparative Example 8:

[0098] The difference from Example 1 is as follows: In step six, 600g of the aldehyde-modified amylopectin obtained in step five, 30g of D-glucosamine hydrochloride, and 60g of 3-aminopropyltriethoxysilane are added simultaneously; in step eight, 3-aminopropyltriethoxysilane is no longer added, and the surface coupling solution is prepared using deionized water, glacial acetic acid, and sodium acetate trihydrate as in step eight of Example 1; in step ten, D-glucosamine hydrochloride is no longer added, and the finishing solution is prepared using deionized water, sodium acetate trihydrate, and glacial acetic acid as in step ten of Example 1; the total amount of aldehyde-modified amylopectin, D-glucosamine hydrochloride, and 3-aminopropyltriethoxysilane added is the same as in Example 1; the remaining conditions are the same as in Example 1.

[0099] Comparative Example 9:

[0100] The difference from Example 1 is that the fabric after two dips and two nips in step seven is pre-dried in hot air at 80°C until the fabric weight is 6500g before proceeding to step eight; the other conditions are the same as in Example 1.

[0101] Performance testing:

[0102] Sample preparation and conditioning before testing: For the fabrics obtained in Examples 1-4 and Comparative Examples 1-9, samples were taken from a location at least 10cm away from the edge along the same width. The comparative examples were prepared based on the same batch of 40S / 2 combed cotton double-ply yarn greige fabric, amylopectin, cellulase working solution, and chemical reagents as in Example 1. All samples were conditioned according to the standard atmospheric conditions for textile conditioning and testing as specified in GB / T 6529-2008, with a conditioning environment of 20℃ and 65% relative humidity for 24 hours. Samples used for post-wash performance testing underwent household washing according to GB / T 8629-2017, using a Type A standard washing machine, a 4N washing program, and standard detergent. After each wash, the samples were naturally air-dried for 24 hours in the same standard atmospheric environment. This process was repeated 10 times before the corresponding performance tests were conducted.

[0103] Weight-average molecular weight and degree of aldehyde substitution of aldehyde-modified amylopectin: The weight-average molecular weight of aldehyde-modified amylopectin was determined according to GB / T47142-2026 "Determination of molecular weight of polysaccharides - Size exclusion chromatography - Multi-angle laser light scattering method". 10 mg of aldehyde-modified amylopectin dried to constant weight at 45 °C was added to 10 mL of 0.10 mol / L sodium nitrate aqueous solution and stirred at 40 °C for 12 h to dissolve. After filtration through a 0.22 μm aqueous filter membrane, the sample was injected. The column temperature was 35 °C, the mobile phase was 0.10 mol / L sodium nitrate aqueous solution, the flow rate was 0.5 mL / min, and the injection volume was 100 μL. A multi-angle laser light scattering detector and a differential refractive index detector were used in combination to record the weight-average molecular weight. The degree of aldehyde substitution was determined by hydroxylamine hydrochloride titration. 0.1000 g of dried aldehyde-substituted amylopectin was added to 20 mL of 0.25 mol / L hydroxylamine hydrochloride solution and 20 mL of deionized water. The mixture was reacted at 40 °C for 2 h. The solution was titrated with 0.1000 mol / L sodium hydroxide standard solution until the pH reached 4.00. The background consumption was deducted from the blank test results. The result was calculated based on the production of two aldehyde groups per oxidized glucose structural unit. The result was expressed as the mass percentage of oxidized glucose structural units out of the total number of glucose structural units.

[0104] Bending stiffness: Fabric softness was determined according to GB / T 18318.1-2009 "Determination of bending properties of textiles - Part 1: Inclined plane method". Six 25mm × 200mm specimens were cut from each sample along both the warp and weft directions. The specimens must not contain creases, stains, weave defects, or selvage areas. On the inclined plane tester, the specimens were moved outwards at a stable speed. The extension length was recorded when the free end of the specimen contacted the 41.5° inclined plane. The bending length and bending stiffness were calculated. The warp and weft bending stiffness were averaged six times each, and then the average warp and weft bending stiffness was calculated. The results are expressed in mN·cm.

[0105] Drape coefficient: The drape of the fabric was determined according to GB / T 23329-2009 "Textiles - Determination of Drape of Fabrics". Three circular specimens with a diameter of 240 mm were cut for each sample. After the specimens were conditioned in standard atmosphere, they were placed in the center of the support plate of the drape apparatus and allowed to hang naturally. After the drape shape stabilized, the projected area was recorded, and the drape coefficient was calculated according to the standard method. The average value of the three specimens was taken.

[0106] Softness retention rate after ten washes: To evaluate the wash resistance and fixation effect of the finishing layer, the sample from the example and comparative examples were washed continuously for 10 times according to the conditions of GB / T 8629-2017. After washing, the warp and weft average bending stiffness were retested according to GB / T 18318.1-2009. The softness retention rate was calculated by the following formula: Softness retention rate = (Warp and weft average bending stiffness of the fabric obtained in step two of the same batch - Warp and weft average bending stiffness of the sample after ten washes) / (Warp and weft average bending stiffness of the fabric obtained in step two of the same batch - Warp and weft average bending stiffness of the sample before washing) × 100%.

[0107] Tensile strength retention rate: Tensile strength was determined according to GB / T 3923.1-2013 "Textiles - Tensile Properties of Fabrics - Part 1: Determination of Tensile Strength and Elongation at Break (Strip Method)". Five 50mm × 250mm samples were cut from each sample along both the warp and weft directions. After hemming, the effective width was 50mm, the clamping distance was 200mm, and the tensile speed was 100mm / min. The maximum tensile strength was recorded. Tensile strength retention rate = Average tensile strength of finished product in both warp and weft directions / Average tensile strength of greige fabric obtained in step two of the same batch × 100%, expressed as a percentage.

[0108] Air permeability: The air permeability of the fabric was determined according to GB / T 5453-1997 "Determination of Air Permeability of Textile Fabrics". Ten test points were selected in an area without creases or obvious defects for each sample, with a test area of ​​20 cm^2. The pressure difference was set to 100 Pa. The distance between test points was not less than 50 mm and the test points should not be located in the selvage area. The air velocity through the fabric was recorded, and the average value of the 10 test points was taken. The result is expressed in mm / s.

[0109] Moisture regain: The moisture absorption stability of the fabric was determined according to GB / T 9995-1997 "Determination of Moisture Content and Moisture Regain of Textile Materials - Oven Drying Method". Approximately 5g of each sample was taken, conditioned for 24 hours in the standard atmosphere specified in GB / T 6529-2008, and the conditioned mass was recorded. Then, the sample was dried in an oven at 105℃ until the difference between two consecutive weighings did not exceed 0.01g. The dried mass was recorded, and the moisture regain was calculated using the standard formula. The result was expressed as a percentage.

[0110] Water droplet diffusion time: The moisture absorption and diffusion properties of the fabric were determined according to GB / T 21655.1-2023 "Evaluation of moisture absorption and quick-drying properties of textiles - Part 1: Single-item combination test method". Three samples were cut for each sample and conditioned in standard atmosphere for 24 hours. The samples were laid flat on a horizontal test platform, and 0.20 mL of deionized water was added to the center of the sample using a micropipette. Timing started from the moment the droplet touched the fabric surface and stopped when the specular reflection of the droplet disappeared and the water droplet completely diffused. The water droplet diffusion time was recorded, and the average value of the three samples was taken. The result is expressed in seconds.

[0111] Table 1 Performance Test Results

[0112] sample <![CDATA[The weight-average molecular weight of aldehyde-group modified branched starch / × 10 5 > Degree of aldehyde substitution / % Average bending stiffness in the warp and weft directions / mN·cm Sag coefficient / % Softness retention rate after 10 washes / % Average fracture strength retention rate in the longitudinal and latitudinal directions / % air permeability / mm / s Moisture regain / % Water diffusion time / s Example 1 3.31 5.2 0.116 34.2 91.8 94.6 126.8 8.6 2.8 Example 2 2.57 3.3 0.109 33.5 82.7 97.2 148.6 8.8 3.6 Example 3 4.43 6.8 0.139 36.7 89.6 90.8 94.7 7.9 2.4 Example 4 3.74 5.9 0.128 35.3 90.5 93.1 116.9 8.3 2.6 Comparative Example 1 8.60 5.1 0.184 42.6 79.4 93.8 91.2 8.0 5.8 Comparative Example 2 3.62 2.1 0.123 36.0 58.6 95.9 132.4 8.7 4.9 Comparative Example 3 3.86 9.4 0.176 41.4 83.6 86.7 98.3 7.6 6.3 Comparative Example 4 3.28 5.0 0.154 39.2 78.2 91.9 110.7 8.1 4.4 Comparative Example 5 3.31 5.2 0.145 38.8 62.9 98.1 121.9 8.4 4.8 Comparative Example 6 3.31 5.2 0.162 40.0 73.5 92.7 104.8 8.0 5.2 Comparative Example 7 3.31 5.2 0.129 36.4 50.6 96.0 130.2 8.9 3.2 Comparative Example 8 3.31 5.2 0.193 43.8 66.4 88.9 87.6 7.5 7.1 Comparative Example 9 3.31 5.2 0.157 39.7 70.8 91.8 106.3 8.1 5.0

[0113] As shown in Table 1, compared with Example 1, Comparative Example 1 did not subject the amylopectin to acid hydrolysis degradation, and the weight-average molecular weight of the aldehyde-modified amylopectin increased to 8.60 × 10⁻⁶. 5 The average bending stiffness in both warp and weft directions increased from 0.116 mN·cm to 0.184 mN·cm, the drape coefficient increased from 34.2% to 42.6%, the air permeability decreased from 126.8 mm / s to 91.2 mm / s, and the water droplet diffusion time increased from 2.8 s to 5.8 s. This indicates that the amylopectin segments with excessively high molecular weight tend to form a thicker or more continuous surface film, which reduces the fabric's softness, air permeability, and moisture absorption and diffusion properties.

[0114] The degree of aldehyde substitution in Comparative Example 2 was reduced to 2.1%, and its weight-average molecular weight was 3.62 × 10⁻⁶. 5 This indicates that reducing the amount of sodium periodate resulted in insufficient ring-opening oxidation, and the amylopectin segments remained relatively intact. However, there were insufficient aldehyde sites to participate in subsequent Schiff base reactions and surface fixation. Therefore, the initial flexural stiffness and air permeability were acceptable, but the softness retention rate decreased significantly after ten washes. In Comparative Example 3, the aldehyde substitution degree increased to 9.4%, and its weight-average molecular weight decreased to 2.86 × 10⁻⁶. 5 This indicates that increasing the amount of sodium periodate enhances the degree of oxidation ring opening and is accompanied by certain chain segment degradation. Although the number of reaction sites increases, the excessively high aldehyde group density makes the cross-linking of the finishing layer too strong, resulting in increased bending stiffness, decreased fracture strength retention rate and prolonged water diffusion time.

[0115] Comparative Example 4, with a weight-average molecular weight and aldehyde substitution degree close to that of Example 1, did not add sodium tetraborate decahydrate for pre-complexation. Its bending stiffness, drape coefficient, and softness retention rate after washing were 0.154 mN·cm, 39.2%, and 78.2%, respectively, all of which were significantly worse than those of Example 1. This indicates that the pre-complexation of sodium tetraborate decahydrate is not a simple addition step, but rather helps to improve the subsequent film formation and fixation state of aldehyde-modified amylopectin.

[0116] Comparative Example 5, which did not undergo cellulase limited treatment, achieved a breaking strength retention rate of 98.1%, but a softness retention rate of only 62.9% after ten washes. This indicates that cellulase treatment in this application is not merely a routine softening process, but primarily serves to provide suitable surface anchoring points for subsequent surface finishing layers.

[0117] In Comparative Example 6, all D-glucosamine hydrochloride was added later, while in Comparative Example 8, aldehyde-modified amylopectin, D-glucosamine hydrochloride, and 3-aminopropyltriethoxysilane were added in a single bath. The flexural stiffness of both increased to 0.162 mN·cm and 0.193 mN·cm, respectively, and the water diffusion time was extended to 5.2 s and 7.1 s, respectively. This indicates that the segmented addition of D-glucosamine hydrochloride and the later coupling of 3-aminopropyltriethoxysilane are beneficial for controlling the stability of the finishing solution and the state of the surface film.

[0118] Comparative Example 7, without the addition of 3-aminopropyltriethoxysilane, had a softness retention rate of only 50.6% after ten washes, indicating that simply increasing the amount of aldehyde-modified branched starch solids cannot replace the wash-resistant fixation effect brought about by silane coupling.

[0119] Comparative Example 9 did not control the pre-drying endpoint at 5800g but entered the subsequent coupling step at 6500g. Its bending stiffness, drape coefficient and softness retention rate after washing were 0.157mN·cm, 39.7% and 70.8%, respectively, indicating that the pre-drying quality endpoint has an important impact on the distribution of the finishing layer on the fiber surface and the subsequent coupling effect.

[0120] A comprehensive comparison shows that Examples 1-4 do not simply pursue the highest value in a single indicator, but rather achieve a balance between lower bending stiffness, lower drape coefficient, higher softness retention rate after washing, higher tensile strength retention rate, suitable air permeability, and shorter drip diffusion time. Among them, Example 1 has a bending stiffness of 0.116 mN·cm, a drape coefficient of 34.2%, a softness retention rate of 91.8% after ten washes, a tensile strength retention rate of 94.6%, an air permeability of 126.8 mm / s, and a drip diffusion time of 2.8 s, showing superior overall performance.

[0121] This demonstrates that the present invention, through the combination of aldehyde-modified amylopectin with specific weight-average molecular weight and degree of aldehyde substitution, pre-complexation with sodium tetraborate decahydrate, limited cellulase treatment, segmented addition of D-glucosamine hydrochloride, post-coupling with 3-aminopropyltriethoxysilane, and pre-drying quality endpoint control, enables the fabric to maintain the strength, breathability, and moisture absorption of cotton fabrics for suit coats while achieving good softness and wash-resistant softness retention, reflecting the comprehensive improvement effect brought about by the synergistic effect of multiple steps.

[0122] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

Claims

1. A highly flexible suit coat fabric, comprising a cotton greige fabric and a flexible finishing layer fixed to the surface of the cotton greige fabric fibers, characterized in that, The cotton fabric is a 2 / 2 twill cotton fabric woven from 36S / 2-50S / 2 combed cotton double-ply yarn as warp and weft yarns. The flexible finishing layer is formed on the surface of the cotton fabric fibers pretreated with cellulase, and is formed by padding and pre-drying with a first surface finishing liquid, post-coupling with a 3-aminopropyltriethoxysilane surface coupling liquid, and post-finishing with a finishing liquid. Based on 5000 parts by weight of the cotton greige fabric, the effective components forming the flexible finishing layer include: 450-750 parts by weight of aldehyde-modified amylopectin, 8-18 parts by weight of the first part D-glucosamine hydrochloride, 40-90 parts by weight of 3-aminopropyltriethoxysilane, and 12-25 parts by weight of the second part D-glucosamine hydrochloride. The first portion of D-glucosamine hydrochloride is added with the first surface finishing solution, the 3-aminopropyltriethoxysilane is added with the 3-aminopropyltriethoxysilane surface coupling solution, and the second portion of D-glucosamine hydrochloride is added with the post-finishing solution. The pre-drying endpoint after the first surface finishing solution is 5600-6100 parts by weight of the fabric. The weight-average molecular weight of the aldehyde-modified amylopectin is 2.50 × 10⁻⁶. 5 -4.50×10 5 The degree of aldehyde substitution of the aldehyde-modified amylopectin is 3.0%-7.0%, and the degree of aldehyde substitution is based on the proportion of oxidized glucose structural units to the total number of glucose structural units. The aldehyde-modified amylopectin is obtained by oxidizing low molecular weight amylopectin with sodium periodate in the presence of sodium tetraborate decahydrate.

2. The highly flexible suit coat fabric according to claim 1, characterized in that, The warp yarn density of the cotton fabric is 390-460 yarns / 10cm, and the weft yarn density is 300-360 yarns / 10cm.

3. The highly flexible suit coat fabric according to claim 1, characterized in that, The cotton fabric is subjected to an alkali boiling treatment before cellulase pretreatment; based on 5000 parts by weight of the cotton fabric, the alkali boiling treatment includes: adding the cotton fabric to a treatment solution containing 90000-120000 parts by weight of deionized water, 260-400 parts by weight of anhydrous sodium carbonate and 80-130 parts by weight of sodium dodecylbenzenesulfonate, keeping it at 88-95℃ for 25-40 minutes, followed by washing and dehydration until the fabric weight is 6500 parts by weight.

4. The highly flexible suit coat fabric according to claim 1, characterized in that, Based on 5000 parts by weight of the cotton greige fabric, the cellulase pretreatment includes: adding 72000-85000 parts by weight of deionized water, 330-450 parts by weight of sodium acetate trihydrate, 75-110 parts by weight of glacial acetic acid, and 18-35 parts by weight of cellulase working solution with an activity of 10000 U / mL to the treatment tank, then adding the cotton greige fabric, and treating at 52-58℃ for 15-25 min; after the treatment, raising the temperature to 90-92℃ and holding for 5-6 min to inactivate the cellulase; then washing and dehydrating to a fabric weight of 6500 parts by weight.

5. The highly flexible suit coat fabric according to claim 1, characterized in that, The low molecular weight amylopectin is obtained by acid hydrolysis degradation of amylopectin. Based on 700-900 parts by weight of amylopectin, the acid hydrolysis degradation includes: adding the amylopectin to 14,000-18,000 parts by weight of deionized water, stirring at 90°C for 35-50 minutes, cooling to 55-65°C, adding 450-750 parts by weight of a 10% hydrochloric acid aqueous solution, and maintaining the temperature for 30-50 minutes; subsequently adding a sodium carbonate aqueous solution prepared from 75-110 parts by weight of anhydrous sodium carbonate and 750-1100 parts by weight of deionized water, and then adding 33,000-42,000 parts by weight of 95% ethanol; followed by precipitation, filtration, washing, and drying to obtain the low molecular weight amylopectin. The preparation of the aldehyde-modified amylopectin includes: taking 550-650 parts by weight of the low molecular weight amylopectin and adding it to 11,000-13,000 parts by weight of deionized water, stirring at 80°C for 30 min, and then cooling to 20°C; adding 5-12 parts by weight of sodium tetraborate decahydrate and stirring for 20 min; adding an aqueous solution of sodium periodate prepared from 25-60 parts by weight of sodium periodate and 1,500-2,500 parts by weight of deionized water under light-protected conditions, with an addition time of 30 min; after the addition is completed, continuing the reaction at 20°C for 70-110 min; then adding 45-75 parts by weight of ethylene glycol and stirring for 15 min to terminate the oxidation reaction, followed by ethanol precipitation, filtration, washing and drying to obtain the aldehyde-modified amylopectin.

6. The highly flexible suit coat fabric according to claim 1, characterized in that, Based on 5000 parts by weight of the cotton greige fabric, the first surface finishing solution is prepared from 56000-65000 parts by weight of deionized water, 450-750 parts by weight of the aldehyde-modified amylopectin, 8-18 parts by weight of the first portion of D-glucosamine hydrochloride, 260-350 parts by weight of sodium acetate trihydrate and 60-100 parts by weight of glacial acetic acid.

7. The highly flexible suit coat fabric according to claim 1, characterized in that, The preparation of the first surface finishing solution includes: stirring deionized water, aldehyde-modified amylopectin, first part D-glucosamine hydrochloride, sodium acetate trihydrate and glacial acetic acid at 48-55℃ for 25-35 min and then cooling to 30℃; the padding of the first surface finishing solution includes: adding the cotton fabric pretreated with cellulase into the first surface finishing solution, immersing at 30℃ for 3-4 min, followed by two dips and two paddings, with the padding rate controlled at 60%-80%, and then pre-drying in hot air at 80℃ to a fabric weight of 5600-6100 parts by weight.

8. The highly flexible suit coat fabric according to claim 1, characterized in that, Based on 5000 parts by weight of the cotton grey fabric, the 3-aminopropyltriethoxysilane surface coupling solution is prepared from 9000-12000 parts by weight of deionized water, 40-90 parts by weight of 3-aminopropyltriethoxysilane, 22-40 parts by weight of glacial acetic acid, 80-120 parts by weight of sodium acetate trihydrate, and 25000-35000 parts by weight of deionized water for dilution. The post-coupling process includes: adding the fabric, which has been impregnated and pre-dried by the first surface finishing solution, into the 3-aminopropyltriethoxysilane surface coupling solution, immersing it at 25°C for 2-3 minutes, followed by one immersion and one padding, with the padding rate controlled at 25%-45%, then drying it in hot air at 90-95°C for 3-4 minutes, and baking it at 110-130°C for 3-5 minutes.

9. The highly flexible suit coat fabric according to claim 1, characterized in that, Based on 5000 parts by weight of the cotton greige fabric, the finishing solution is prepared from 35000-45000 parts by weight of deionized water, 12-25 parts by weight of the second part D-glucosamine hydrochloride, 160-240 parts by weight of sodium acetate trihydrate and 30-55 parts by weight of glacial acetic acid; the finishing process includes: adding the post-coupled fabric to the finishing solution, immersing for 2 minutes and then padding once and once, with the padding rate controlled at 50%-70%, then drying at 80°C for 5 minutes, then washing twice with deionized water at 40°C, dehydrating and drying at 80°C until the fabric moisture content is not higher than 8%.

10. A textile process for a highly flexible suit coat fabric according to any one of claims 1-9, characterized in that, Includes the following steps: (1) Take 36S / 2-50S / 2 combed cotton double-ply yarn as warp yarn and 36S / 2-50S / 2 combed cotton double-ply yarn as weft yarn, and weave cotton fabric using 2 / 2 twill weave. (2) The cotton fabric is subjected to alkali boiling, washing and dehydration; (3) The cotton fabric obtained in step (2) is pretreated with cellulase and the cellulase is deactivated. After washing, it is dehydrated. (4) Amylopectin is degraded by acid hydrolysis to obtain low molecular weight amylopectin; (5) The low molecular weight amylopectin is oxidized with sodium periodate in the presence of sodium tetraborate decahydrate to obtain aldehyde-modified amylopectin. (6) Deionized water, the aldehyde-modified amylopectin, the first part of D-glucosamine hydrochloride, sodium acetate trihydrate and glacial acetic acid are mixed to obtain the first surface finishing solution; (7) The cotton fabric obtained in step (3) is immersed in the first surface finishing solution, then dipped and rubbed twice, and pre-dried until the fabric weight is 112%-122% of the initial weight of the cotton fabric; (8) Mix 3-aminopropyltriethoxysilane, glacial acetic acid, sodium acetate trihydrate and deionized water to obtain 3-aminopropyltriethoxysilane surface coupling solution; (9) The pre-dried fabric from step (7) is immersed in the 3-aminopropyltriethoxysilane surface coupling solution, followed by one dip and one roll, drying and baking; (10) Mix deionized water, the second part D-glucosamine hydrochloride, sodium acetate trihydrate and glacial acetic acid to obtain the finishing solution; (11) The fabric obtained in step (9) is immersed in the finishing liquid, then dipped and rolled, dried, washed, dehydrated and dried to obtain the high-flexibility suit coat fabric.