An anti-fouling and anti-wrinkle suit fabric and a preparation method thereof

Abstract

This invention relates to the field of fabric technology, specifically to a stain-resistant and wrinkle-resistant suit fabric and its preparation method. The fabric comprises a wool-blend twill fabric and a stain-resistant, easy-to-clean, and wrinkle-resistant finishing layer formed on the surface of its fibers. In preparation, the wool-blend twill fabric is first lightly activated in an acetate buffer system using laccase and cellulase; then, it undergoes a one-dip-one-pinch treatment with a partially aldehyde-modified sodium alginate aqueous solution; subsequently, it is treated sequentially with adipate dihydrazide and calcium chloride to form a finishing layer on the fiber surface. The partially aldehyde-modified sodium alginate is obtained by fractional oxidation of sodium alginate with sodium periodate in the presence of calcium gluconate monohydrate, followed by ethylene glycol-terminated oxidation and ultrafiltration concentration. This finishing layer does not rely on a fluorine-containing low surface energy continuous membrane, improving the stain resistance of coffee liquid, the ease of cleaning with artificial sebum, and wrinkle recovery; and it maintains good stain resistance, easy cleaning, and wrinkle recovery performance even after five dry cleanings.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, and in particular to a stain-resistant and wrinkle-resistant suit fabric and its preparation method. Background Technology

[0002] Suits need to balance a crisp appearance with easy daily care. Wool blends are favored for their moisture absorption and breathability, but natural fibers have high surface energy, easily attracting stains, and their wrinkle recovery decreases significantly with repeated wear. Current stain-resistant finishes often use fluorinated compounds to create low surface energy films, which can repel oil in the short term, but the continuous sealing of the film reduces the fabric's breathability by more than 30%, resulting in a noticeably stuffy feeling when worn. At the same time, fluorinated substances have poor biodegradability, and their use has been restricted by the EU REACH regulation.

[0003] Wrinkle-resistant finishing often relies on resin crosslinking agents. High-temperature baking can easily cause the disulfide bonds in wool fibers to break, resulting in a hardened fabric feel. Furthermore, during dry cleaning, the solvent swells the crosslinked network, and after five dry cleanings, the wrinkle recovery angle decreases by more than 40%. While sodium alginate finishing, which has been attempted in recent years, is environmentally friendly, the surface film formed by simple ion crosslinking has weak adhesion to the fibers and is easily detached after washing, failing to simultaneously satisfy both stain resistance and wrinkle retention. How to construct a surface structure that combines dynamic hydration and firm anchoring through green processes under fluorine-free conditions has become a technical bottleneck for the functionalization of wool blended fabrics. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose a stain-resistant and wrinkle-resistant suit fabric and its preparation method, so as to solve the problem that the existing stain-resistant and wrinkle-resistant finishing of wool blend suit fabrics is difficult to balance fluorine-free environmental protection, dry cleaning durability and breathability, and that single finishing technology is prone to functional degradation or reduced wearing comfort.

[0005] Based on the above objectives, the present invention provides a stain-resistant and wrinkle-resistant suit fabric, comprising a wool blend twill fabric and a stain-resistant and wrinkle-resistant finishing layer formed on the surface of the wool blend twill fabric. Based on 1000 parts by weight of the wool blend twill fabric, the wool blend twill fabric is first activated by an enzyme treatment solution containing 1-3 parts of laccase and 1-3 parts of cellulase, and then sequentially treated by a treatment solution containing 2500-3500 parts of partially aldehyde-modified sodium alginate aqueous solution, a treatment solution containing 4-8 parts of adipic acid dihydrazide, and a calcium ion locking solution containing 36-60 parts of anhydrous calcium chloride to form the stain-resistant and wrinkle-resistant finishing layer.

[0006] The anti-fouling and anti-wrinkle finishing layer includes a hydrazone bond bridging structure formed by partially aldehyde-based sodium alginate and adipic acid dihydrazide, as well as an ion-locking structure formed by calcium ions.

[0007] The partially aldehyde-modified sodium alginate aqueous solution contains 15-25 g / kg of partially aldehyde-modified sodium alginate on a dry basis. The partially aldehyde-modified sodium alginate is obtained by fractional oxidation of sodium alginate with sodium periodate in the presence of calcium gluconate monohydrate, followed by ethylene glycol-terminated oxidation and ultrafiltration concentration.

[0008] Preferably, the wool blend twill fabric comprises wool, polyester fiber, viscose fiber and spandex; by weight percentage, the wool blend twill fabric consists of 29% wool, 33% polyester fiber, 33% viscose fiber and 5% spandex.

[0009] Preferably, the number-average molecular weight of the partially aldehyde-modified sodium alginate is 5.9 × 10⁻⁶. 4 g / mol up to 10.8 × 10 4 g / mol, with aldehyde content ranging from 482.7 to 630.5 mmol / kg.

[0010] Preferably, the partially aldehyde-modified sodium alginate aqueous solution is prepared as follows:

[0011] Take 80-120 parts of sodium alginate and add 9880-9920 parts of deionized water to make the total mass of sodium alginate and deionized water 10000 parts. Stir at 20-30℃ for 3-5 hours, filter, add 2-5 parts of calcium gluconate monohydrate, and continue stirring at 20-30℃ for 20-40 minutes.

[0012] Dissolve 4-8 parts of sodium periodate in 400-800 parts of deionized water to prepare a sodium periodate solution; first add a solution containing 60%-75% of the total sodium periodate to the sodium alginate solution, react for 20-40 minutes in the dark at 2-8℃, then add the remaining sodium periodate solution, and react for 40-80 minutes in the dark at 15-25℃.

[0013] Then add 6-10 parts of ethylene glycol and stir at 20-25℃ for 20-40 min to terminate the oxidation; pass the reaction solution through an ultrafiltration membrane with a molecular weight cutoff of 10000 Da and continuously replace it with deionized water until the conductivity of the filtrate is lower than 100 μS / cm, and then concentrate it to a dry basis content of 15-25 g / kg of partially aldehyde-modified sodium alginate to obtain an aqueous solution of partially aldehyde-modified sodium alginate.

[0014] Preferably, the enzyme treatment solution comprises 7000-9000 parts deionized water, 6-10 parts sodium acetate trihydrate, 1-3 parts glacial acetic acid, 1-3 parts laccase, and 1-3 parts cellulase.

[0015] Preferably, the laccase has an enzyme activity of not less than 500 U / g, and the cellulase has an enzyme activity of not less than 700 U / g.

[0016] Preferably, the partially aldehyde-modified sodium alginate aqueous solution, the adipic acid dihydrazide, and the anhydrous calcium chloride are sequentially introduced into the surface layer of the wool blended twill fabric through a dip-and-roll process.

[0017] Preferably, the residue rate during the treatment with the partially aldehyde-modified sodium alginate aqueous solution is 55%-65%, the residue rate during the treatment with adipic dihydrazide is 45%-55%, and the residue rate during the treatment with anhydrous calcium chloride is 45%-55%.

[0018] This invention also provides a method for preparing a stain-resistant and wrinkle-resistant suit fabric, comprising the following steps:

[0019] (1) The wool blend twill fabric is pretreated and dried to obtain a pretreated fabric;

[0020] (2) Preparation of partially aldehyde-modified sodium alginate aqueous solution;

[0021] (3) The pretreated fabric is enzymatically activated using an enzyme treatment solution containing laccase and cellulase to obtain an enzymatically activated fabric;

[0022] (4) The enzymatically activated fabric is treated with the partially aldehyde-modified sodium alginate aqueous solution to anchor the partially aldehyde-modified sodium alginate to the surface of the fabric.

[0023] (5) The fabric obtained in step (4) is treated with adipic acid dihydrazide treatment solution to form a hydrazone bond bridging structure with partially aldehyde-modified sodium alginate;

[0024] (6) The fabric obtained in step (5) is treated with calcium ion locking liquid so that calcium ions lock the partial aldehyde-modified sodium alginate on the surface of the fabric to obtain stain-resistant and wrinkle-resistant suit fabric.

[0025] The beneficial effects of this invention are:

[0026] This invention prepares partially aldehyde-modified sodium alginate using a calcium gluconate-assisted segmented oxidation process, controlling its number-average molecular weight to be 5.9 × 10⁻⁶. 4 -10.8×10 4 The aldehyde content was controlled at 482.7-630.5 mmol / kg. This partially aldehyde-modified sodium alginate can anchor the surface layer of wool blended fabric fibers after shallow activation by laccase and cellulase, and then form hydrazone bonds through adipate dihydrazide, and enhance the stability of the finishing layer through calcium ion coordination locking. Compared with Comparative Example 6 without partially aldehyde-modified sodium alginate, the stain resistance of coffee liquid and the stain removal rate of artificial sebum in Example 5 both increased from level 2.0 to level 4.5, and the wrinkle recovery angle increased from 238.6° to 305.6°, indicating that the finishing layer can significantly improve the fabric's liquid stain resistance, sebum stain removal, and wrinkle recovery.

[0027] The finishing layer of this invention does not primarily function as a continuous oil-repellent film with low surface energy and containing fluorine. Examples 1-6 exhibit an oil repellency rating of 2-3 and an air permeability of 160.8-203.8 mm / s. Example 5, under conditions of a coffee liquid stain resistance rating of 4.5, an artificial sebum-removable stain resistance rating of 4.5, and a wrinkle recovery angle of 305.6°, exhibits an air permeability of 176.2 mm / s. After five cycles of tetrachloroethylene dry cleaning and ironing according to GB / T19981.2-2014, Example 5 still maintains a coffee liquid stain resistance rating of 4, a wrinkle recovery angle of 295.4°, and a wrinkle recovery angle reduction rate of approximately 3.3%, indicating good dry cleaning durability. Detailed Implementation

[0028] 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.

[0029] The wool blend twill fabric used in this specific embodiment is the Matsubara VI60003 wool blend washable stretch twill fabric from the ApparelX platform, with a weight of 229g / m². 2The fabric is 148cm wide, with a twill weave, and is made of 29% wool, 33% polyester, 33% viscose, and 5% spandex. The deionized water used conforms to GB / T standards. Laboratory water meeting the Class II water requirements of 6682-2008; the fatty alcohol polyoxyethylene ether AEO-9 used is fatty alcohol polyoxyethylene ether from Shanghai Aladdin Biochemical Technology Co., Ltd., product number A304366; the sodium bicarbonate used is sodium bicarbonate from Sigma-Aldrich, product number S5761, with a content of 99.5% to 100.5%; the sodium alginate used is low-viscosity sodium alginate salt from Sigma-Aldrich, product number A1112, derived from brown algae; the calcium gluconate monohydrate used is calcium gluconate monohydrate from TCI, product number G0037, with a purity greater than 98.0%; the sodium periodate used is sodium periodate from Shanghai Aladdin Biochemical Technology Co., Ltd., product number S104091; the ethylene glycol used is ethylene glycol from Shanghai Aladdin Biochemical Technology Co., Ltd., product number E103322, with a purity not less than 99%. The purity of the sodium acetate trihydrate used was Sigma-Aldrich S8625, not less than 99.0%; the glacial acetic acid used was Merck Supelco 1.00063, 100% pure; the laccase used was Sigma-Aldrich 38429, derived from *Trichoderma reesei*, powder, with an enzyme activity not less than 500 U / g; the cellulase used was Sigma-Aldrich C2730, derived from *Trichoderma reesei*, aqueous solution, with an enzyme activity not less than 700 U / g; the adipic acid dihydrazide used was Sigma-Aldrich 841689, powder; and the anhydrous calcium chloride used was Sigma-Aldrich C1016, anhydrous calcium chloride, with a content not less than 93.0%. All examples and comparative examples used the same batch of wool-blend twill fabric and the same batch of chemical reagents.

[0030] Example 1:

[0031] Step 1: Take 1000g of wool blend twill fabric, add 8000g of deionized water, 12g of fatty alcohol polyoxyethylene ether AEO-9 and 4g of sodium bicarbonate, treat at 40℃ for 20min, drain after treatment, wash with 6000g of deionized water for 5min, then wash with 6000g of deionized water for 5min; dry the washed fabric in hot air at 60℃ until the moisture content is 8.2%, the moisture content is calculated based on the difference in weight before and after drying;

[0032] Step 2: Take 100g of sodium alginate, add 9900g of deionized water, and stir at 25℃ for 4h. Filter the resulting solution through a 100-mesh nylon screen. Add 3g of calcium gluconate monohydrate to the filtered solution and continue stirring at 25℃ for 30min. Dissolve 6g of sodium periodate in 600g of deionized water to prepare a sodium periodate solution. First, add a solution containing 4g of sodium periodate to the sodium alginate solution and react at 5℃ in the dark for 30min. Then add a solution containing 2g of sodium periodate and react at 20℃ in the dark for 60min. Subsequently, add 8g of ethylene glycol and stir at 20℃ for 30min to terminate the oxidation. Pass the reaction solution through an ultrafiltration membrane with a molecular weight cutoff of 10000Da and continuously replace it with deionized water until the conductivity of the filtrate is lower than 100μS / cm. Then concentrate it to a dry basis content of 20g / kg of partially aldehyde-modified sodium alginate to obtain a partially aldehyde-modified sodium alginate aqueous solution.

[0033] Step 3: Take 8000g of deionized water, add 8g of sodium acetate trihydrate, 2g of glacial acetic acid, 2g of laccase, and 2g of cellulase, and stir for 10 minutes. Place 1000g of the pretreated fabric obtained in Step 1 into the enzyme treatment solution for one dip and one pad, with the padding rate controlled at 55%. Unfold the padded fabric and place it in a constant temperature environment of 40℃ and 90% relative humidity for 20 minutes. After the reaction, immediately place the fabric into 8000g of deionized water at 80℃ for 5 minutes to inactivate the enzyme, then wash it with 6000g of deionized water for 5 minutes, and wash it again with 6000g of deionized water for 5 minutes. Finally, dry it at 60℃ until the moisture content is 8.4%.

[0034] Step 4: Take 3000g of the partially aldehyde-modified sodium alginate aqueous solution obtained in Step 2, add 4g of sodium acetate trihydrate and 1g of glacial acetic acid to the solution, stir for 30min, and immerse 1000g of the enzyme-activated fabric obtained in Step 3 in the treatment solution for one dip and one pad, with the padding rate controlled at 60%; after padding, place the fabric flat at 30℃ for 15min, and then pre-dry it at 70℃ until the moisture content is 15.3%;

[0035] Step 5: Take 3000g of deionized water, add 6g of adipic acid dihydrazide, 4g of sodium acetate trihydrate and 1g of glacial acetic acid, stir for 20min, immerse and pad the fabric obtained in Step 4 in the adipic acid dihydrazide treatment solution, and control the padding rate to 50%; after padding, place the fabric flat at 30℃ for 20min, and then dry at 80℃ for 10min.

[0036] Step Six: Take 3000g of deionized water, add 48g of anhydrous calcium chloride, 35g of sodium acetate trihydrate and 1g of glacial acetic acid, stir for 20 minutes, immerse and rub the fabric obtained in Step Five in the calcium ion locking solution, control the pick-up rate to 50%, dry the fabric at 85℃ for 8 minutes, and then bake at 110℃ for 5 minutes; after baking, wash with 6000g of deionized water for 5 minutes, then wash with 6000g of deionized water for 5 minutes, then dry at 60℃, and then rehydrate at 20℃ and 65% relative humidity for 24 hours to obtain stain-resistant and wrinkle-resistant suit fabric.

[0037] Example 2:

[0038] Step 1: Take 1000g of wool blend twill fabric, add 7500g of deionized water, 10g of fatty alcohol polyoxyethylene ether AEO-9 and 3g of sodium bicarbonate, treat at 38℃ for 18min, drain after treatment, wash with 6000g of deionized water for 5min, then wash with 6000g of deionized water for 5min; dry the washed fabric in hot air at 60℃ until the moisture content is 8.0%, the moisture content is calculated based on the difference in weight before and after drying;

[0039] Step 2: Take 90g of sodium alginate, add 9910g of deionized water, stir at 24℃ for 3.5h, and filter the resulting solution through a 100-mesh nylon mesh; add 2g of calcium gluconate monohydrate to the filtered solution, and continue stirring at 24℃ for 25min; dissolve 4.8g of sodium periodate in 480g of deionized water to prepare a sodium periodate solution; first add a solution containing 3.2g of sodium periodate to the sodium alginate solution, and react for 25 minutes under light-protected conditions at 5℃. min, then add a solution containing 1.6g sodium periodate, and react for 50 min at 20℃ in the dark; then add 7g ethylene glycol, and stir at 20℃ for 25 min to terminate the oxidation; the reaction solution is continuously replaced with deionized water through an ultrafiltration membrane with a molecular weight cutoff of 10000 Da until the conductivity of the filtrate is lower than 100μS / cm, and then concentrated to a dry basis content of 16g / kg of partially aldehyde-modified sodium alginate to obtain an aqueous solution of partially aldehyde-modified sodium alginate;

[0040] Step 3: Take 7500g of deionized water, add 7g of sodium acetate trihydrate, 1.5g of glacial acetic acid, 1.5g of laccase, and 1.5g of cellulase, stir for 10 minutes, and immerse 1000g of the pretreated fabric obtained in Step 1 in the enzyme treatment solution for one dip and one swab, with the swab rate controlled at 52%; unfold the swab-treated fabric flat and place it in a constant temperature environment of 38℃ and 88% relative humidity for 18 minutes; immediately after the reaction, immerse the fabric in 7500g of 78℃ deionized water for 5 minutes to inactivate the enzyme, then wash with 6000g of deionized water for 5 minutes, wash again with 6000g of deionized water for 5 minutes, and finally dry at 60℃ to a moisture content of 8.2%;

[0041] Step 4: Take 2800g of the partially aldehyde-modified sodium alginate aqueous solution obtained in Step 2, add 3.5g of sodium acetate trihydrate and 0.8g of glacial acetic acid to the solution, stir for 30min, and then immerse 1000g of the enzyme-activated fabric obtained in Step 3 in the treatment solution for one dip and one pad, with the padding rate controlled at 57%; after padding, place the fabric flat at 30℃ for 12min, and then pre-dry it at 68℃ until the moisture content is 13.0%;

[0042] Step 5: Take 2800g of deionized water, add 4.5g of adipic acid dihydrazide, 3.5g of sodium acetate trihydrate and 0.8g of glacial acetic acid, stir for 20min, immerse and pad the fabric obtained in Step 4 in the adipic acid dihydrazide treatment solution, and control the padding rate to 48%; after padding, place the fabric flat at 30℃ for 18min, and then dry at 78℃ for 9min;

[0043] Step Six: Take 2800g of deionized water, add 38g of anhydrous calcium chloride, 32g of sodium acetate trihydrate and 0.8g of glacial acetic acid, stir for 20 minutes, immerse and rub the fabric obtained in Step Five in the calcium ion locking solution, control the pick-up rate to 48%, dry the fabric at 82℃ for 7 minutes, and then bake at 108℃ for 4 minutes; after baking, wash with 6000g of deionized water for 5 minutes, then wash with 6000g of deionized water for 5 minutes, then dry at 60℃, and then rehydrate at 20℃ and 65% relative humidity for 24 hours to obtain stain-resistant and wrinkle-resistant suit fabric.

[0044] Example 3:

[0045] Step 1: Take 1000g of wool blend twill fabric, add 8500g of deionized water, 14g of fatty alcohol polyoxyethylene ether AEO-9 and 5g of sodium bicarbonate, treat at 42℃ for 22min, drain the liquid after treatment, wash with 6000g of deionized water for 5min, and then wash with 6000g of deionized water for 5min; dry the washed fabric in a hot air condition at 60℃ until the moisture content is 8.8%, the moisture content is calculated based on the difference in weight before and after drying;

[0046] Step 2: Take 110g of sodium alginate, add 9890g of deionized water, stir at 26℃ for 4.5h, and filter the resulting solution through a 100-mesh nylon mesh; add 4.5g of calcium gluconate monohydrate to the filtered solution, and continue stirring at 26℃ for 35min; dissolve 7.5g of sodium periodate in 750g of deionized water to prepare a sodium periodate solution; first add a solution containing 5.3g of sodium periodate to the sodium alginate solution, and react for 3 minutes under light-protected conditions at 5℃. After 5 minutes, a solution containing 2.2 g of sodium periodate was added, and the reaction was carried out at 20°C in the dark for 70 minutes. Then, 9.5 g of ethylene glycol was added, and the oxidation was terminated by stirring at 20°C for 35 minutes. The reaction solution was continuously replaced with deionized water through an ultrafiltration membrane with a molecular weight cutoff of 10000 Da until the conductivity of the filtrate was lower than 100 μS / cm. The solution was then concentrated until the dry basis content of partially aldehyde-modified sodium alginate was 24 g / kg, thus obtaining an aqueous solution of partially aldehyde-modified sodium alginate.

[0047] Step 3: Take 8500g of deionized water, add 9g of sodium acetate trihydrate, 2.5g of glacial acetic acid, 2.7g of laccase, and 2.7g of cellulase, stir for 10 minutes, and immerse 1000g of the pretreated fabric obtained in Step 1 in the enzyme treatment solution for one dip and one swab, with the swab rate controlled at 58%; unfold the swab-treated fabric flat and place it in a constant temperature environment of 42℃ and 92% relative humidity for 25 minutes; immediately after the reaction, immerse the fabric in 8500g of 82℃ deionized water for 5 minutes to inactivate the enzyme, then wash it with 6000g of deionized water for 5 minutes, wash it again with 6000g of deionized water for 5 minutes, and finally dry it at 60℃ to a moisture content of 8.7%;

[0048] Step 4: Take 3400g of the partially aldehyde-modified sodium alginate aqueous solution obtained in Step 2, add 4.8g of sodium acetate trihydrate and 1.3g of glacial acetic acid to the solution, stir for 30min, and then immerse 1000g of the enzyme-activated fabric obtained in Step 3 in the treatment solution for one dip and one pad, with the padding rate controlled at 64%; after padding, place the fabric flat at 30℃ for 18min, and then pre-dry it at 72℃ until the moisture content is 17.0%;

[0049] Step 5: Take 3400g of deionized water, add 7.5g of adipic acid dihydrazide, 4.8g of sodium acetate trihydrate and 1.3g of glacial acetic acid, stir for 20min, immerse and pad the fabric obtained in Step 4 in the adipic acid dihydrazide treatment solution, and control the padding rate to 54%; after padding, place the fabric flat at 30℃ for 24min, and then dry at 82℃ for 11min;

[0050] Step Six: Take 3400g of deionized water, add 58g of anhydrous calcium chloride, 39g of sodium acetate trihydrate and 1.3g of glacial acetic acid, stir for 20 minutes, immerse and rub the fabric obtained in Step Five in the calcium ion locking solution, control the pick-up rate to 54%, dry the fabric at 88℃ for 10 minutes, and then bake at 114℃ for 6 minutes; after baking, wash with 6000g of deionized water for 5 minutes, then wash with 6000g of deionized water for 5 minutes, then dry at 60℃, and then rehydrate at 20℃ and 65% relative humidity for 24 hours to obtain stain-resistant and wrinkle-resistant suit fabric.

[0051] Example 4:

[0052] Step 1: Take 1000g of wool blend twill fabric, add 8000g of deionized water, 12g of fatty alcohol polyoxyethylene ether AEO-9 and 4g of sodium bicarbonate, treat at 40℃ for 20min, drain after treatment, wash with 6000g of deionized water for 5min, then wash with 6000g of deionized water for 5min; dry the washed fabric in hot air at 60℃ until the moisture content is 8.1%, the moisture content is calculated based on the difference in weight before and after drying;

[0053] Step 2: Take 100g of sodium alginate, add 9900g of deionized water, stir at 25℃ for 4 hours, and filter the resulting solution through a 100-mesh nylon mesh; add 3.5g of calcium gluconate monohydrate to the filtered solution, and continue stirring at 25℃ for 30 minutes; dissolve 5.5g of sodium periodate in 550g of deionized water to prepare a sodium periodate solution; first add a solution containing 3.8g of sodium periodate to the sodium alginate solution, and react for 3 minutes under light-protected conditions at 5℃. 0 min, then add a solution containing 1.7 g sodium periodate, and react for 55 min at 20°C in the dark; then add 8 g ethylene glycol, and stir at 20°C for 30 min to terminate the oxidation; the reaction solution is continuously replaced with deionized water through an ultrafiltration membrane with a molecular weight cutoff of 10000 Da until the conductivity of the filtrate is lower than 100 μS / cm, and then concentrated to a dry basis content of 20 g / kg of partially aldehyde-modified sodium alginate to obtain an aqueous solution of partially aldehyde-modified sodium alginate;

[0054] Step 3: Take 8000g of deionized water, add 8g of sodium acetate trihydrate, 2g of glacial acetic acid, 1.2g of laccase and 2.2g of cellulase, stir for 10 minutes, and immerse 1000g of the pretreated fabric obtained in Step 1 in the enzyme treatment solution for one dip and one swab, with the swab rate controlled at 54%; unfold the swab-treated fabric flat and place it in a constant temperature environment of 39℃ and 90% relative humidity for 22 minutes; immediately after the reaction, immerse the fabric in 8000g of 80℃ deionized water for 5 minutes to inactivate the enzyme, then wash with 6000g of deionized water for 5 minutes, wash again with 6000g of deionized water for 5 minutes, and finally dry at 60℃ to a moisture content of 8.3%;

[0055] Step 4: Take 3000g of the partially aldehyde-modified sodium alginate aqueous solution obtained in Step 2, add 4g of sodium acetate trihydrate and 1g of glacial acetic acid to the solution, stir for 30min, and immerse 1000g of the enzyme-activated fabric obtained in Step 3 in the treatment solution for one dip and one pad, with the padding rate controlled at 59%; after padding, place the fabric flat at 30℃ for 15min, and then pre-dry it at 70℃ until the moisture content is 14.4%;

[0056] Step 5: Take 3000g of deionized water, add 5.5g of adipic acid dihydrazide, 4g of sodium acetate trihydrate and 1g of glacial acetic acid, stir for 20min, immerse and pad the fabric obtained in Step 4 in the adipic acid dihydrazide treatment solution, and control the padding rate to 50%; after padding, place the fabric flat at 30℃ for 20min, and then dry at 80℃ for 10min;

[0057] Step Six: Take 3000g of deionized water, add 44g of anhydrous calcium chloride, 35g of sodium acetate trihydrate and 1g of glacial acetic acid, stir for 20 minutes, immerse and rub the fabric obtained in Step Five in the calcium ion locking solution, control the pick-up rate to 50%, dry the fabric at 85℃ for 8 minutes, and then bake at 110℃ for 5 minutes; after baking, wash with 6000g of deionized water for 5 minutes, then wash with 6000g of deionized water for 5 minutes, then dry at 60℃, and then rehydrate at 20℃ and 65% relative humidity for 24 hours to obtain stain-resistant and wrinkle-resistant suit fabric.

[0058] Example 5:

[0059] Step 1: Take 1000g of wool blend twill fabric, add 8000g of deionized water, 13g of fatty alcohol polyoxyethylene ether AEO-9 and 4g of sodium bicarbonate, treat at 40℃ for 20min, drain after treatment, wash with 6000g of deionized water for 5min, then wash with 6000g of deionized water for 5min; dry the washed fabric in 60℃ hot air until the moisture content is 8.3%, the moisture content is calculated based on the difference in weight before and after drying;

[0060] Step 2: Take 100g of sodium alginate, add 9900g of deionized water, and stir at 25℃ for 4 hours. Filter the resulting solution through a 100-mesh nylon mesh. Add 4g of calcium gluconate monohydrate to the filtered solution and continue stirring at 25℃ for 30 minutes. Dissolve 6.2g of sodium periodate in 620g of deionized water to prepare a sodium periodate solution. First, add a solution containing 4.5g of sodium periodate to the sodium alginate solution, and react for 30 minutes under light-protected conditions at 5℃. Add 1.7 g of sodium periodate solution and react for 65 min at 20°C in the dark; then add 8.5 g of ethylene glycol and stir for 30 min at 20°C to terminate the oxidation; the reaction solution is continuously replaced with deionized water through an ultrafiltration membrane with a molecular weight cutoff of 10000 Da until the conductivity of the filtrate is lower than 100 μS / cm, and then concentrated to a dry basis content of 21 g / kg of partially aldehyde-modified sodium alginate to obtain an aqueous solution of partially aldehyde-modified sodium alginate.

[0061] Step 3: Take 8000g of deionized water, add 8g of sodium acetate trihydrate, 2g of glacial acetic acid, 2.8g of laccase and 1.8g of cellulase, stir for 10 minutes, and immerse 1000g of the pretreated fabric obtained in Step 1 in the enzyme treatment solution for one dip and one swab, with the swab rate controlled at 56%; unfold the swab-treated fabric flat and place it in a constant temperature environment of 41℃ and 90% relative humidity for 22 minutes; immediately after the reaction, immerse the fabric in 8000g of 80℃ deionized water for 5 minutes to inactivate the enzyme, then wash with 6000g of deionized water for 5 minutes, wash again with 6000g of deionized water for 5 minutes, and finally dry at 60℃ to a moisture content of 8.5%;

[0062] Step 4: Take 3200g of the partially aldehyde-modified sodium alginate aqueous solution obtained in Step 2, add 4.2g of sodium acetate trihydrate and 1g of glacial acetic acid to the solution, stir for 30min, and then immerse 1000g of the enzyme-activated fabric obtained in Step 3 in the treatment solution for one dip and one pad, with the pad-up rate controlled at 61%; after padding, place the fabric flat at 30℃ for 16min, and then pre-dry it at 70℃ until the moisture content is 15.8%;

[0063] Step 5: Take 3200g of deionized water, add 6.5g of adipic acid dihydrazide, 4.2g of sodium acetate trihydrate and 1g of glacial acetic acid, stir for 20min, immerse and pad the fabric obtained in Step 4 in the adipic acid dihydrazide treatment solution, and control the padding rate to 52%; after padding, place the fabric flat at 30℃ for 21min, and then dry it at 80℃ for 10min;

[0064] Step Six: Take 3200g of deionized water, add 50g of anhydrous calcium chloride, 36g of sodium acetate trihydrate and 1g of glacial acetic acid, stir for 20min, immerse and rub the fabric obtained in Step Five in the calcium ion locking solution, control the pick-up rate to 51%, dry the fabric at 86℃ for 8min, and then bake at 111℃ for 5min; after baking, wash with 6000g of deionized water for 5min, then wash with 6000g of deionized water for 5min, then dry at 60℃, and then rehydrate at 20℃ and 65% relative humidity for 24h to obtain stain-resistant and wrinkle-resistant suit fabric.

[0065] Example 6:

[0066] Step 1: Take 1000g of wool blend twill fabric, add 9000g of deionized water, 16g of fatty alcohol polyoxyethylene ether AEO-9 and 6g of sodium bicarbonate, treat at 45℃ for 25min, drain after treatment, wash with 6000g of deionized water for 5min, then wash with 6000g of deionized water for 5min; dry the washed fabric in hot air at 60℃ until the moisture content is 9.0%, the moisture content is calculated based on the difference in weight before and after drying;

[0067] Step 2: Take 120g of sodium alginate, add 9880g of deionized water, stir at 30℃ for 5 hours, and filter the resulting solution through a 100-mesh nylon mesh; add 5g of calcium gluconate monohydrate to the filtered solution, and continue stirring at 30℃ for 40 minutes; dissolve 6.8g of sodium periodate in 680g of deionized water to prepare a sodium periodate solution; first add a solution containing 4.8g of sodium periodate to the sodium alginate solution, and react for 40 minutes under light-protected conditions at 5℃. Add 2.0 g of sodium periodate solution to the reaction mixture and react at 20°C for 80 min in the dark. Then add 10 g of ethylene glycol and stir at 25°C for 40 min to terminate the oxidation. Pass the reaction solution through an ultrafiltration membrane with a molecular weight cutoff of 10000 Da and continuously replace it with deionized water until the conductivity of the filtrate is lower than 100 μS / cm. Then concentrate the solution to a dry basis content of 25 g / kg of partially aldehyde-modified sodium alginate to obtain an aqueous solution of partially aldehyde-modified sodium alginate.

[0068] Step 3: Take 9000g of deionized water, add 10g of sodium acetate trihydrate, 3g of glacial acetic acid, 3g of laccase, and 3g of cellulase, and stir for 10 minutes. Put 1000g of the pretreated fabric obtained in Step 1 into the enzyme treatment solution for one dip and one pad, with the padding rate controlled at 60%. Unfold the padded fabric and place it in a constant temperature environment of 45℃ and 95% relative humidity for 29 minutes. After the reaction, immediately put the fabric into 9000g of deionized water at 85℃ for 6 minutes to inactivate the enzyme, then wash it with 6000g of deionized water for 5 minutes, and wash it again with 6000g of deionized water for 5 minutes. Finally, dry it at 60℃ to a moisture content of 9.2%.

[0069] Step 4: Take 3500g of the partially aldehyde-modified sodium alginate aqueous solution obtained in Step 2, add 5g of sodium acetate trihydrate and 1.5g of glacial acetic acid to the solution, stir for 30min, and then immerse 1000g of the enzyme-activated fabric obtained in Step 3 in the treatment solution for one dip and one pad, with the padding rate controlled at 65%; after padding, place the fabric flat at 35℃ for 20min, and then pre-dry it at 75℃ until the moisture content is 18.0%;

[0070] Step 5: Take 3500g of deionized water, add 8g of adipic acid dihydrazide, 5g of sodium acetate trihydrate and 1.5g of glacial acetic acid, stir for 20min, immerse and pad the fabric obtained in Step 4 in the adipic acid dihydrazide treatment solution, and control the padding rate to 55%; after padding, place the fabric flat at 35℃ for 25min, and then dry at 85℃ for 12min;

[0071] Step Six: Take 3500g of deionized water, add 60g of anhydrous calcium chloride, 40g of sodium acetate trihydrate and 1.5g of glacial acetic acid, stir for 20 minutes, immerse and rub the fabric obtained in Step Five in the calcium ion locking solution, control the pick-up rate to 55%, dry the fabric at 90℃ for 10 minutes, and then bake at 115℃ for 6 minutes; after baking, wash with 6000g of deionized water for 5 minutes, then wash with 6000g of deionized water for 5 minutes, then dry at 60℃, and then rehydrate at 20℃ and 65% relative humidity for 24 hours to obtain stain-resistant and wrinkle-resistant suit fabric.

[0072] Comparative Example 1:

[0073] The difference from Example 1 is that 3g of calcium gluconate monohydrate is not added in step two, and 3g of deionized water is used to make up the total mass of the additives in step two; the other conditions are the same as in Example 1.

[0074] Comparative Example 2:

[0075] The difference from Example 1 is that in step two, 3g of calcium gluconate monohydrate is replaced with 0.74g of anhydrous calcium chloride, and 2.26g of deionized water is used to make up the total mass of the additives in step two; the other conditions are the same as in Example 1.

[0076] Comparative Example 3:

[0077] The difference from Example 1 is that: in step two, instead of adding 6g of sodium periodate dissolved in 600g of deionized water to prepare a sodium periodate solution, 600g of deionized water is added at the same time point. In the step of terminating oxidation, 8g of ethylene glycol is still added, and the resulting aqueous solution is an aqueous solution of sodium alginate that has not been oxidized by sodium periodate; the other conditions are the same as in Example 1.

[0078] Comparative Example 4:

[0079] The difference from Example 1 is that 2g of laccase is not added in step three, and 2g of deionized water is used to make up the total mass of the enzyme treatment solution in step three; the other conditions are the same as in Example 1.

[0080] Comparative Example 5:

[0081] The difference from Example 1 is that 2g of cellulase is not added in step three, and 2g of deionized water is used to make up the total mass of the enzyme treatment solution in step three; the other conditions are the same as in Example 1.

[0082] Comparative Example 6:

[0083] The difference from Example 1 is that, in step four, instead of adding the 3000g partially aldehyde-modified sodium alginate aqueous solution obtained in step two, 3000g of deionized water is added, and the sodium acetate trihydrate, glacial acetic acid, stirring time, roll-off rate, flat-laying conditions and pre-drying conditions in step four remain unchanged; the other conditions are the same as in Example 1.

[0084] Comparative Example 7:

[0085] The difference from Example 1 is that 6g of adipic acid dihydrazide is not added in step five, and 6g of deionized water is used to make up the total mass of the adipic acid dihydrazide treatment solution in step five; the other conditions are the same as in Example 1.

[0086] Comparative Example 8:

[0087] The difference from Example 1 is that: in step four, 6g of adipate dihydrazide is added to 3000g of partially aldehyde-modified sodium alginate aqueous solution; in step five, 6g of adipate dihydrazide is not added and 6g of deionized water is used to make up the total mass of the treatment solution in step five; the other conditions are the same as in Example 1.

[0088] Comparative Example 9:

[0089] The difference from Example 1 is that 48g of anhydrous calcium chloride is not added in step six, and 48g of deionized water is used to make up the total mass of the calcium ion locking solution in step six; the other conditions are the same as in Example 1.

[0090] Performance testing:

[0091] Sample preparation, conditioning, and durability pretreatment: Test samples were taken from the stain-resistant and wrinkle-resistant suit fabrics obtained in Examples 1-6 and Comparative Examples 1-9, respectively. Each sample was cut from at least 10 cm from the selvage, avoiding obvious creases, stains, and weft skew areas. Unless otherwise specified, all samples were conditioned for 24 hours in standard atmosphere at 20°C and 65% relative humidity according to GB / T 6529-2008 before testing. Samples used for dry cleaning durability testing were first treated with five cycles of tetrachloroethylene dry cleaning and ironing according to GB / T 19981.2-2014. After each dry cleaning, they were conditioned for 24 hours in standard atmosphere at 20°C and 65% relative humidity before undergoing the corresponding stain resistance and wrinkle recovery tests. At least five parallel samples were taken for each test, and the results were the arithmetic mean; for grade-level indicators, the median of the five parallel samples was used.

[0092] Number-average molecular weight and aldehyde content of partially aldehyde-modified sodium alginate: 20 g each of the aqueous solutions obtained in step two of Examples 1-6 and Comparative Examples 1-9 were freeze-dried at -50°C for 24 h to obtain dried samples. The number-average molecular weight was determined by gel permeation chromatography, and the aldehyde content was determined by hydroxylamine hydrochloride titration.

[0093] Coffee liquid stain resistance: The test was conducted according to the liquid stain resistance test method in GB / T 30159.1-2013. 2.0g of commercially available instant coffee was added to 100mL of 90℃ deionized water and stirred until completely dissolved. The solution was then cooled to 20℃ to obtain the coffee stain. The conditioned fabric sample was cut into 100mm×100mm specimens and placed flat on a horizontal glass plate with the fabric right side facing up. 0.20mL of coffee stain was dropped into the center of the specimen using a micropipette, allowing the droplet to naturally contact the fabric surface. After standing for 30 minutes at 20℃ and 65% relative humidity, the stained area was covered with quantitative filter paper, and a 500g weight was applied to the filter paper for 10 seconds. The weight and filter paper were removed, and the stain residue was observed. Five specimens were tested for each sample, and the stain resistance rating was determined according to the method specified in GB / T 30159.1-2013. A higher rating indicates that liquid stains are less likely to adhere to or remain.

[0094] Ease of stain removal of artificial sebum: The test was conducted according to the stain removal test method in FZ / T 01118-2012. The artificial sebum was prepared by stirring 35g oleic acid, 30g trioleic acid glyceride, 15g squalene, 10g cholesterol oleate, and 10g liquid paraffin at 40℃ for 30min. The conditioned fabric sample was cut into 100mm×100mm specimens, laid flat with the right side facing up, and 0.10g of artificial sebum was evenly applied to a 25mm×25mm area in the center of the specimen with a scraper. After covering with a polyethylene film, a 1000g weight was applied for 10min to ensure full contact between the stain and the fabric surface. After removing the weight and film, the sample was placed in an environment with a temperature of 20℃ and a relative humidity of 65% for 30min. Subsequently, a white cotton cloth moistened with 0.20% fatty alcohol polyoxyethylene ether AEO-9 aqueous solution and squeezed to a liquid content of 100% was used to rub the sample 10 times along the warp direction under a load of 500g. The wiping stroke was 100mm and the speed was 100mm / s. After wiping, the sample was dried at 60℃ for 10min and then rehydrated for 2h. The sample was rated according to the stain-removability evaluation method specified in FZ / T 01118-2012. The higher the rating, the easier it is to remove oily sebum stains.

[0095] Oil repellency: Hydrocarbon resistance test according to GB / T 19977-2014. Cut the conditioned fabric sample into 200mm×200mm specimens and place them flat on a horizontal test platform with the right side facing up. Test sequentially according to the oil repellency test liquid sequence specified in the standard, from low to high grade. Add 5 drops of the corresponding test liquid at different positions on the specimen each time, with each drop having a volume of 0.05mL. Observe for 30 seconds after adding the liquid. If the drop does not wet, spread, or significantly penetrate within 30 seconds, the grade is considered passed. Test 5 specimens for each sample and record the highest oil repellency grade that can be passed. The higher the grade, the stronger the fabric's resistance to oily liquids.

[0096] Wrinkle recovery angle: Determined according to GB / T 3819-1997 using the recovery angle method. Five 40mm × 15mm samples were cut from the conditioned fabric along both the warp and weft directions. The samples were folded in half with the right sides facing inwards and placed in a standard crease pressing device. A 10N load was applied for 5 minutes. Immediately after removing the load, the samples were transferred to the recovery angle measuring instrument fixture, ensuring the crease was in the specified position. The recovery angle was read after 5 minutes of recovery. The warp and weft recovery angles were recorded for each sample, and the sum of the warp and weft recovery angles was taken as the wrinkle recovery angle, in degrees. A larger wrinkle recovery angle indicates better shape recovery ability of the fabric after bending or pressing.

[0097] Coffee liquid stain resistance and wrinkle recovery angle after dry cleaning: Fabrics obtained from Examples 1-6 and Comparative Examples 1-9 were subjected to five cycles of tetrachloroethylene dry cleaning and ironing according to GB / T 19981.2-2014. After dry cleaning, the samples were conditioned for 24 hours in standard atmosphere at 20°C and 65% relative humidity, and then the coffee liquid stain resistance and wrinkle recovery angle were measured respectively.

[0098] Air permeability: The air permeability of the fabric was determined according to GB / T 5453-1997. The conditioned fabric sample was cut into specimens of at least 200mm × 200mm, with a test area of ​​20cm². 2 With the fabric face towards the airflow inlet, the pressure difference was set to 100 Pa. For each sample, avoiding fabric edges, creases, and obvious defects, 10 different locations were selected for testing. The air permeability at each location was recorded, and the average value was calculated in mm / s.

[0099] Table 1 Performance Test Results

[0100]

[0101] As can be seen from Table 1, although Comparative Example 6 was still treated with enzymes, adipic acid dihydrazide, and calcium chloride, it did not introduce some aldehyde-modified sodium alginate into the fabric surface. The stain resistance rating of coffee liquid was only 2.0, the stain removal rating of artificial sebum was 2.0, and the wrinkle recovery angle was 238.6°. This indicates that the subsequent treatment alone is not enough to form an effective stain-resistant and wrinkle-resistant effect.

[0102] Comparative Example 3 used sodium alginate that was not oxidized by sodium periodate, with an aldehyde content of only 12.4 mmol / kg. Although it could produce some surface retention through calcium ions, it lacked aldehyde groups that could bridge with adipic dihydrazide. After 5 dry cleanings, the stain resistance of the coffee liquid dropped to level 2.0.

[0103] Comparative Examples 1 and 2 omitted calcium gluconate monohydrate or replaced it with anhydrous calcium chloride, resulting in the molecular weight and aldehyde content of partially aldehyde-modified sodium alginate deviating from the suitable range of the examples, and the resulting finished layer had insufficient uniformity and durability. Comparative Examples 4 and 5 lacked shallow activation of laccase or cellulase, indicating that the surface reactive sites of the wool component and viscose component both contributed to the anchoring of alginate derivatives.

[0104] Compared with Comparative Example 7 (without adipic acid dihydrazide), Comparative Example 8 (with partially aldehyde-modified sodium alginate added in the same bath as adipic acid dihydrazide), and Comparative Example 9 (without anhydrous calcium chloride), Example 1, by employing the sequence of first anchoring, then hydrazone bridging, and then calcium ion locking, achieved a coffee liquid stain resistance rating of 4.0, an artificial sebum wiping stain resistance rating of 4.0, and a wrinkle recovery angle of 292.8°. After 5 dry cleanings, it still maintained a coffee liquid stain resistance rating of 3.5 and a wrinkle recovery angle of 281.7°, indicating that the process sequence has a significant impact on the formation and maintenance of the surface micronetwork. Example 2 still achieved a stain resistance rating of 3.5 and a wrinkle recovery angle of 278.6° under milder conditions. Examples 3, 5, and 6 further improved stain resistance and wrinkle resistance by increasing the amount of partially aldehyde-modified sodium alginate, the intensity of enzyme activation, the amount of adipic dihydrazide, or the calcium ion locking strength. Among them, Example 5 achieved a relatively balanced performance in terms of stain resistance, easy stain removal, wrinkle recovery, and breathability. It achieved a stain resistance rating of 4.5 for coffee liquid staining and an easy stain removal rating for artificial sebum wiping, with a wrinkle recovery angle of 305.6°. After 5 dry cleanings, the wrinkle recovery angle was still 295.4°.

[0105] Meanwhile, the oil repellency levels of Examples 1 to 6 are only at levels 2 to 3, indicating that the stain-resistant effect of this invention does not primarily rely on a low surface energy continuous oil-repellent film, but is more likely derived from a discontinuous hydrated micronetwork formed on the surface of the wool blend twill fabric after shallow activation by laccase / cellulase, with partially aldehyde-modified sodium alginate, adipic acid dihydrazide, and calcium ions. This micronetwork improves stain retention, erasure, and wrinkle recovery while maintaining air permeability at 160.8-203.8 mm / s, without exhibiting the excessive decrease in air permeability caused by a continuous closed film. In summary, this invention achieves a good synergistic balance between stain resistance, easy stain removal, wrinkle resistance, durability, and breathability through a combination of calcium gluconate-assisted segmented oxidation, dual-enzyme shallow activation, partially aldehyde-modified sodium alginate surface anchoring, adipic acid dihydrazide hysteresis bridging, and calcium chloride post-locking.

[0106] 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 stain-resistant and wrinkle-resistant suit fabric, comprising a wool blend twill fabric and a stain-resistant and wrinkle-resistant finishing layer formed on the surface of the wool blend twill fabric, characterized in that, Based on 1000 parts by weight of the wool blend twill fabric, the wool blend twill fabric is first activated by an enzyme treatment solution containing 1-3 parts of laccase and 1-3 parts of cellulase, and then sequentially treated by a treatment solution containing 2500-3500 parts of partially aldehyde-modified sodium alginate aqueous solution, a treatment solution containing 4-8 parts of adipic acid dihydrazide, and a calcium ion locking solution containing 36-60 parts of anhydrous calcium chloride to form the stain-resistant and wrinkle-resistant finishing layer. The anti-fouling and anti-wrinkle finishing layer includes a hydrazone bond bridging structure formed by partially aldehyde-based sodium alginate and adipic acid dihydrazide, as well as an ion-locking structure formed by calcium ions. The partially aldehyde-modified sodium alginate aqueous solution contains 15-25 g / kg of partially aldehyde-modified sodium alginate on a dry basis. The partially aldehyde-modified sodium alginate is obtained by fractional oxidation of sodium alginate with sodium periodate in the presence of calcium gluconate monohydrate, followed by ethylene glycol-terminated oxidation and ultrafiltration concentration.

2. The stain-resistant and wrinkle-resistant suit fabric according to claim 1, characterized in that, The wool blend twill fabric comprises wool, polyester fiber, viscose fiber and spandex; by weight percentage, the wool blend twill fabric consists of 29% wool, 33% polyester fiber, 33% viscose fiber and 5% spandex.

3. The stain-resistant and wrinkle-resistant suit fabric according to claim 1, characterized in that, The number-average molecular weight of the partially aldehyde-modified sodium alginate is 5.9 × 10⁻⁶. 4 g / mol up to 10.8 × 10 4 g / mol, with aldehyde content ranging from 482.7 to 630.5 mmol / kg.

4. The stain-resistant and wrinkle-resistant suit fabric according to claim 1, characterized in that, The partially aldehyde-modified sodium alginate aqueous solution was prepared as follows: Take 80-120 parts of sodium alginate and add 9880-9920 parts of deionized water to make the total mass of sodium alginate and deionized water 10000 parts. Stir at 20-30℃ for 3-5 hours, filter, add 2-5 parts of calcium gluconate monohydrate, and continue stirring at 20-30℃ for 20-40 minutes. Dissolve 4-8 parts of sodium periodate in 400-800 parts of deionized water to prepare a sodium periodate solution; first add a solution containing 60%-75% of the total sodium periodate to the sodium alginate solution, react for 20-40 minutes in the dark at 2-8℃, then add the remaining sodium periodate solution, and react for 40-80 minutes in the dark at 15-25℃. Then add 6-10 parts of ethylene glycol and stir at 20-25℃ for 20-40 min to terminate the oxidation; pass the reaction solution through an ultrafiltration membrane with a molecular weight cutoff of 10000 Da and continuously replace it with deionized water until the conductivity of the filtrate is lower than 100 μS / cm, and then concentrate it to a dry basis content of 15-25 g / kg of partially aldehyde-modified sodium alginate to obtain an aqueous solution of partially aldehyde-modified sodium alginate.

5. The stain-resistant and wrinkle-resistant suit fabric according to claim 1, characterized in that, The enzyme treatment solution comprises 7000-9000 parts deionized water, 6-10 parts sodium acetate trihydrate, 1-3 parts glacial acetic acid, 1-3 parts laccase, and 1-3 parts cellulase.

6. The stain-resistant and wrinkle-resistant suit fabric according to claim 1, characterized in that, The laccase has an enzyme activity of not less than 500 U / g, and the cellulase has an enzyme activity of not less than 700 U / g.

7. The stain-resistant and wrinkle-resistant suit fabric according to claim 1, characterized in that, The partially aldehyde-modified sodium alginate aqueous solution, the adipic acid dihydrazide, and the anhydrous calcium chloride are sequentially introduced into the surface layer of the wool blended twill fabric through a dip-and-roll process.

8. The stain-resistant and wrinkle-resistant suit fabric according to claim 7, characterized in that, The residue rate after treatment with the partially aldehyde-modified sodium alginate aqueous solution is 55%-65%, the residue rate after treatment with the adipic dihydrazide is 45%-55%, and the residue rate after treatment with the anhydrous calcium chloride is 45%-55%.

9. A method for preparing a stain-resistant and wrinkle-resistant suit fabric according to any one of claims 1-8, characterized in that, Includes the following steps: (1) The wool blend twill fabric is pretreated and dried to obtain a pretreated fabric; (2) Preparation of partially aldehyde-modified sodium alginate aqueous solution; (3) The pretreated fabric is enzymatically activated using an enzyme treatment solution containing laccase and cellulase to obtain an enzymatically activated fabric; (4) The enzymatically activated fabric is treated with the partially aldehyde-modified sodium alginate aqueous solution to anchor the partially aldehyde-modified sodium alginate to the surface of the fabric. (5) The fabric obtained in step (4) is treated with adipic acid dihydrazide treatment solution to form a hydrazone bond bridging structure with partially aldehyde-modified sodium alginate; (6) The fabric obtained in step (5) is treated with calcium ion locking liquid so that calcium ions lock the partial aldehyde-modified sodium alginate on the surface of the fabric to obtain stain-resistant and wrinkle-resistant suit fabric.

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