Method for modifying ramie fabric

Abstract

The invention provides a modification method of a ramie fabric, which comprises the following steps: sequentially treating and modifying the ramie fabric by three stages of pectinase, complex enzyme comprising xylanase, hemicellulase, cellulase and laccase, and alkaline protease, so that hairiness on the surface of the ramie fabric is greatly reduced, and the scratchiness is greatly reduced. The wearing experience feeling of the textile taking the ramie fabric as the raw material is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of ramie textile processing, and more specifically to a method for modifying ramie fabric. Background Art

[0002] Ramie, also known as "Chinese grass", is an important source of natural fiber. It is a very distinctive economic crop in my country and an indispensable part of my country's economic development. my country is rich in ramie resources, and its products are exported overseas and are widely popular, with sales ranking first in the world. Ramie textiles are widely used in clothing, home textiles, and industrial textiles because of their unique properties such as lightness, crispness, coolness, breathability, antibacterial, and natural style. However, ramie fibers have the characteristics of high crystallinity, high rigidity, high fiber length unevenness, and poor mutual cohesion, which makes the surface hairiness of the fabric quite significant. Therefore, when there is a lot of hairiness on the surface of ramie, ramie fiber products have a significant itchy feeling, which seriously affects the wearing experience of consumers and restricts the vigorous development of the ramie industry. Therefore, it is of great scientific significance and economic value to develop modification technology for ramie fabrics and select appropriate process conditions to make up for the defects of ramie fabrics themselves so that they can obtain good wearing performance.

[0003] In recent years, with the improvement of residents' consumption level and living standards in my country, the concept of green, environmental protection and safety has gradually taken root in people's hearts. Therefore, finding green and pollution-free ramie fabric modification technology is an inevitable requirement and trend for the current development of the industry.

[0004] At present, Patents ZL01108073.6, ZL200410023161.9, 201110393514.4 and ZL201310626018.8 respectively use cellulase to modify and finish ramie yarn, summer cloth, ramie fabric and pure ramie knitted underwear fabric to improve the itching of ramie fiber or fabric; Patent ZL202211372027.4 uses pectinase, metal salt and non-ionic surfactant to form a ramie textile finishing agent, which can reduce the itching of ramie textiles. The above patents all use a single biological enzyme or a single biological enzyme combined with other chemical agents to modify ramie yarn or fabric in order to reduce the itching of ramie fabric. Although the combination of chemical agents and biological enzymes has a certain modification effect, the effect is limited. On the other hand, there is no systematic bioenzyme modification of ramie fabrics using an optimized combination of multiple bioenzymes to obtain a green, environmentally friendly and pollution-free modification process that completely relies on bioenzymes for ramie fabric treatment. Summary of the invention

[0005] Based on the above technical problems existing in the prior art, the present invention provides a method for modifying ramie fabric. The method modifies the ramie fabric by segmented biological enzymes, which can greatly reduce the hairiness on the surface of the ramie fabric, thereby greatly reducing the itching feeling, and greatly improving the wearing experience of textiles made of ramie fabric as raw material.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A method for modifying ramie fabric comprises the following steps:

[0008] S1, first placing the ramie fabric in a first buffer solution containing pectinase at pH 3.5-4.5 for reaction, and after the reaction is completed, taking out the ramie fabric;

[0009] S2, placing the ramie fabric treated in step S1 in a second buffer solution containing a complex enzyme solution at a pH of 4.8-5.5 for reaction, and after the reaction is completed, taking out the ramie fabric;

[0010] S3, placing the ramie fabric treated in step S2 in a third buffer solution containing alkaline protease at a pH of 7.0-8.0 for reaction to obtain a modified ramie fabric;

[0011] Among them, the concentration of pectinase in the first buffer is 1.5%-2.5% (w / v); the second buffer includes 3.5%-4.5% (w / v) xylanase, 1.5%-3.0% (w / v) hemicellulase, 2.5%-3.5% (w / v) cellulase and 2.5%-4% (w / v) laccase; the content of alkaline protease in the third buffer is 1.5%-3.0% (w / v).

[0012] In some embodiments, the content of pectinase in the first buffer is 2%; the second buffer comprises 4% xylanase, 2% hemicellulase, 3% cellulase and 3% laccase; and the content of alkaline protease in the third buffer is 2%.

[0013] In some embodiments, the first buffer has a pH of 4, the second buffer has a pH of 5, and the third buffer has a pH of 7.6.

[0014] In some embodiments, the bath ratio in step S1 is 1:10-1:20.

[0015] In some embodiments, the bath ratio in step S2 is 1:10-1:20.

[0016] In some embodiments, the bath ratio in step S3 is 1:10-1:20.

[0017] In some embodiments, the reaction temperature in step S1 is 45-55°C.

[0018] In some embodiments, the reaction temperature in step S2 is 45-55°C.

[0019] In some embodiments, the reaction temperature in step S3 is 45-55°C.

[0020] In some embodiments, in step S1, the reaction time is 50-60 min.

[0021] In some embodiments, in step S2, the reaction time is 50-60 min.

[0022] In some embodiments, in step S3, the reaction time is 50-60 min.

[0023] In some embodiments, the first buffer is one of a citrate buffer and a PBS buffer.

[0024] In some embodiments, the second buffer is one of a citrate buffer and a PBS buffer.

[0025] In some embodiments, the third buffer is one of a citrate buffer and a PBS buffer.

[0026] In some embodiments, the ramie fabric may be knitted and / or woven.

[0027] The present invention also provides ramie fabric obtained by the modification method of any one of the above embodiments.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] The method of the present invention processes ramie fabrics in strict order with different biological enzymes under different process conditions, thereby achieving modification of the ramie fabrics and effectively reducing the hairiness on the surface of the ramie fabrics, thereby significantly reducing the itching sensation of the ramie fabrics and improving the wearing experience of textiles made of the ramie fabrics as raw materials.

[0030] In addition, the modification treatment of ramie fabric by the present invention completely relies on biological enzymes, and the treatment process is efficient, green, environmentally friendly, and has no pollution to the environment, and is suitable for the field of ramie textile processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The surface fiber morphology of ramie fabric before and after modification;

[0032] Figure 2 This is the infrared spectrum of ramie fabric before and after modification. DETAILED DESCRIPTION

[0033] Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar modifications without violating the connotation of the present invention, so the present invention is not limited to the specific implementation disclosed below.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0035] Example 1: Segmented enzymatic modification process of ramie fabric

[0036] The ramie fabric is processed in three stages, as follows:

[0037] (1) Stage 1: Pectinase modification of ramie fabric

[0038] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase was added to treat the ramie fabric for 50-60 minutes at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. Subsequently, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0039] (2) The second stage: compound enzyme modification of ramie fabric

[0040] A citrate buffer solution with a pH of 5 was prepared, and 4% xylanase, 2% hemicellulase, 3% cellulase and 3% laccase were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. After modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0041] (3) The third stage: Alkaline protease modification of ramie fabric

[0042] A citrate buffer solution with a pH of 7.6 was prepared, 2% alkaline protease was added under the conditions of a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0043] After drying, the modified ramie fabric can be obtained.

[0044] Comparative Example 1 Optimization of the amount of pectinase added during the modification process of ramie fabric

[0045] Citrate buffer with pH 4 was prepared. Under the conditions of bath ratio of 1:10-1:20 and enzyme modification temperature of 50°C, 1%, 2%, 3%, 4% and 5% pectinase were added to the ramie fabric modification system respectively. After modification treatment for 50-60 minutes, the ramie fabric was dried and the itchiness of the modified ramie fabric was evaluated.

[0046] Comparative Example 2 Optimization of xylanase addition in ramie fabric modification process

[0047] Citrate buffer with pH 5 was prepared, and 1%, 2%, 3%, 4% and 5% xylanase were added to the ramie fabric modification system respectively at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. After the modification treatment for 50-60 minutes, the ramie fabric was dried and the itchiness of the modified ramie fabric was evaluated.

[0048] Comparative Example 3 Optimization of the amount of hemicellulase added during the modification process of ramie fabric

[0049] Citrate buffer with pH 5 was prepared. Under the conditions of bath ratio of 1:10-1:20 and enzyme modification temperature of 50°C, 1%, 2%, 3%, 4% and 5% of hemicellulase were added to the ramie fabric modification system respectively. After modification treatment for 50-60 minutes, the ramie fabric was dried and the itchiness of the modified ramie fabric was evaluated.

[0050] Comparative Example 4 Optimization of the amount of cellulase added in the process of ramie fabric modification

[0051] Citrate buffer with pH 5 was prepared, and 1%, 2%, 3%, 4% and 5% of cellulase were added to the ramie fabric modification system at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, respectively. After the modification treatment for 50-60 minutes, the ramie fabric was dried and the itchiness of the modified ramie fabric was evaluated.

[0052] Comparative Example 5 Optimization of laccase addition amount in ramie fabric modification process

[0053] Citrate buffer with pH 5 was prepared. Under the conditions of bath ratio of 1:10-1:20 and enzyme modification temperature of 50°C, 1%, 2%, 3%, 4% and 5% laccase were added to the ramie fabric modification system respectively. After modification treatment for 50-60 minutes, the ramie fabric was dried and the itchiness of the modified ramie fabric was evaluated.

[0054] Comparative Example 6 Optimization of the amount of alkaline protease added during the modification process of ramie fabric

[0055] Citrate buffer with pH 7.6 was prepared. Under the conditions of bath ratio of 1:10-1:20 and enzyme modification temperature of 50°C, 1%, 2%, 3%, 4% and 5% alkaline protease were added to the ramie fabric modification system respectively. After modification treatment for 50-60 minutes, the ramie fabric was dried and the itchiness of the modified ramie fabric was evaluated.

[0056] Comparative Example 7 Ramie fabric segmented modification process combination 1

[0057] (1) Stage 1: Pectinase modification of ramie fabric

[0058] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase was added to treat the ramie fabric for 50-60 minutes at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. Subsequently, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0059] (2) The second stage: compound enzyme modification of ramie fabric

[0060] A citrate buffer solution with a pH of 5 was prepared, and 4% xylanase, 3% cellulase and 3% laccase were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. After modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0061] (3) The third stage: Alkaline protease modification of ramie fabric

[0062] A citrate buffer solution with a pH of 7.6 was prepared, 2% alkaline protease was added under the conditions of a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0063] After drying, the modified ramie fabric can be obtained.

[0064] Comparative Example 8 Ramie fabric segmented modification process combination 2

[0065] (1) Stage 1: Pectinase modification of ramie fabric

[0066] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase was added to treat the ramie fabric for 50-60 minutes at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. Subsequently, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0067] (2) The second stage: compound enzyme modification of ramie fabric

[0068] A citrate buffer solution with a pH of 5 was prepared, and 2% hemicellulase, 3% cellulase and 3% laccase were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. After modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0069] (3) The third stage: Alkaline protease modification of ramie fabric

[0070] A citrate buffer solution with a pH of 7.6 was prepared, 2% alkaline protease was added under the conditions of a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0071] After drying, the modified ramie fabric can be obtained.

[0072] Comparative Example 9 Ramie fabric segmented modification process combination three

[0073] (1) Stage 1: Pectinase modification of ramie fabric

[0074] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase was added to treat the ramie fabric for 50-60 minutes at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. Subsequently, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0075] (2) The second stage: compound enzyme modification of ramie fabric

[0076] A citrate buffer solution with a pH of 5 was prepared, and 4% xylanase and 3% laccase were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. After modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0077] (3) The third stage: Alkaline protease modification of ramie fabric

[0078] A citrate buffer solution with a pH of 7.6 was prepared, 2% alkaline protease was added under the conditions of a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0079] After drying, the modified ramie fabric can be obtained.

[0080] Comparative Example 10 Ramie fabric segmented modification process combination 4

[0081] (1) Stage 1: Pectinase modification of ramie fabric

[0082] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase was added to treat the ramie fabric for 50-60 minutes at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. Subsequently, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0083] (2) The second stage: compound enzyme modification of ramie fabric

[0084] A citrate buffer solution with a pH of 5 was prepared, and 2% hemicellulase and 3% laccase were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. After modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0085] (3) The third stage: Alkaline protease modification of ramie fabric

[0086] A citrate buffer solution with a pH of 7.6 was prepared, 2% alkaline protease was added under the conditions of a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0087] After drying, the modified ramie fabric can be obtained.

[0088] Comparative Example 11 Ramie fabric segmented modification process combination five

[0089] (1) Stage 1: Pectinase modification of ramie fabric

[0090] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase was added to treat the ramie fabric for 50-60 minutes at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. Subsequently, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0091] (2) The second stage: compound enzyme modification of ramie fabric

[0092] A citrate buffer solution with a pH of 5 was prepared, and 4% xylanase, 2% hemicellulase and 3% laccase were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. After modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0093] (3) The third stage: Alkaline protease modification of ramie fabric

[0094] A citrate buffer solution with a pH of 7.6 was prepared, 2% alkaline protease was added under the conditions of a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0095] After drying, the modified ramie fabric can be obtained.

[0096] Comparative Example 12 Ramie fabric segmented modification process combination 6

[0097] (1) Stage 1: Pectinase modification of ramie fabric

[0098] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase was added to treat the ramie fabric for 50-60 minutes at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. Subsequently, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0099] (2) The second stage: compound enzyme modification of ramie fabric

[0100] A citrate buffer solution with a pH of 5 was prepared, and 4% xylanase and 3% laccase were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. After modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0101] After drying, the modified ramie fabric can be obtained.

[0102] Comparative Example 13 Ramie fabric segmented modification process combination seven

[0103] (1) Stage 1: Pectinase modification of ramie fabric

[0104] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase was added to treat the ramie fabric for 50-60 minutes at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. Subsequently, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0105] (2) Second stage: Xylanase modification of ramie fabric

[0106] A citrate buffer solution with a pH of 5 was prepared, 4% xylanase was added under the conditions of a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0107] After drying, the modified ramie fabric can be obtained.

[0108] Comparative Example 14 Ramie fabric segmented modification process combination eight

[0109] (1) Stage 1: Pectinase modification of ramie fabric

[0110] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase was added to treat the ramie fabric for 50-60 minutes at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. Subsequently, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0111] (2) The second stage: compound enzyme modification of ramie fabric

[0112] A citrate buffer solution with a pH of 5 was prepared, 4% xylanase and 3% cellulase were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0113] After drying, the modified ramie fabric can be obtained.

[0114] Comparative Example 15 Ramie fabric segmented modification process combination nine

[0115] (1) Stage 1: Pectinase modification of ramie fabric

[0116] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase was added to treat the ramie fabric for 50-60 minutes at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. Subsequently, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0117] (2) Second stage: Cellulase modification of ramie fabric

[0118] A citrate buffer solution with a pH of 5 was prepared, 3% cellulase was added under the conditions of a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0119] After drying, the modified ramie fabric can be obtained.

[0120] Comparative Example 16 Ramie fabric segmented modification process combination ten

[0121] (1) Stage 1: Pectinase modification of ramie fabric

[0122] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase was added to treat the ramie fabric for 50-60 minutes at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. Subsequently, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0123] (2) The second stage: compound enzyme modification of ramie fabric

[0124] A citrate buffer solution with a pH of 5 was prepared, and 4% xylanase, 3% cellulase and 3% laccase were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. After modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0125] After drying, the modified ramie fabric can be obtained.

[0126] Comparative Example 17 Ramie fabric segmented modification process combination XI

[0127] (1) Stage 1: Cellulase modification of ramie fabric

[0128] A citrate buffer solution with a pH of 5 was prepared, 3% cellulase was added under the conditions of a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0129] (2) Second stage: Alkaline protease modification of ramie fabric

[0130] A citrate buffer solution with a pH of 7.6 was prepared, 2% alkaline protease was added under the conditions of a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0131] After drying, the modified ramie fabric can be obtained.

[0132] Comparative Example 18 Ramie fabric integrated modification process (pH 4)

[0133] A citrate buffer solution with a pH of 4 was prepared, and 2% pectinase, 4% xylanase, 2% hemicellulase, 3% cellulase, 3% laccase and 2% alkaline protease were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. The modification treatment was carried out for 50-60 minutes, and then the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0134] After drying, the modified ramie fabric can be obtained.

[0135] Comparative Example 19 Ramie fabric integrated modification process (pH 5)

[0136] A citrate buffer solution with a pH of 5 was prepared, and 2% pectinase, 4% xylanase, 2% hemicellulase, 3% cellulase, 3% laccase and 2% alkaline protease were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. The modification treatment was carried out for 50-60 minutes, and then the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0137] After drying, the modified ramie fabric can be obtained.

[0138] Comparative Example 20 Ramie fabric integrated modification process (pH 7.6)

[0139] A citrate buffer solution with a pH of 7.6 was prepared, and 2% pectinase, 4% xylanase, 2% hemicellulase, 3% cellulase, 3% laccase and 2% alkaline protease were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. The modification treatment was carried out for 50-60 minutes, and then the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0140] After drying, the modified ramie fabric can be obtained.

[0141] Comparative Example 21 Ramie fabric integrated modification process (pH natural)

[0142] The pH value of the enzyme modification system was set to natural, and 2% pectinase, 4% xylanase, 2% hemicellulase, 3% cellulase, 3% laccase and 2% alkaline protease were added at a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C. The modification treatment was carried out for 50-60 minutes, and then the ramie fabric was fully washed to remove the residual biological enzymes on the surface.

[0143] After drying, the modified ramie fabric can be obtained.

[0144] Comparative Example 22 Ramie fabric chemical preparation + biological enzyme preparation combined modification process

[0145] (1) Stage 1: Chemical treatment of ramie fabrics

[0146] Prepare the following aqueous solution: 375 mM NaOH, 39.7 mM Na 2 SO 3 、25.4mM Na 2 SiO 3 、6.8mM Na 5 P 3 O 10 The fabric was treated at a bath ratio of 1:10-1:20 and a temperature of 100°C for 50-60 minutes, and then the ramie fabric was fully washed to remove the chemical agents remaining on the surface.

[0147] (2) Second stage: Alkaline protease modification of ramie fabric

[0148] A citrate buffer solution with a pH of 7.6 was prepared, 2% alkaline protease was added under the conditions of a bath ratio of 1:10-1:20 and an enzyme modification temperature of 50°C, and after modification treatment for 50-60 minutes, the ramie fabric was fully washed to remove the residual biological enzyme on the surface.

[0149] After drying, the modified ramie fabric can be obtained.

[0150] The performance of ramie fabrics before and after treatment was tested as follows:

[0151] 1. Evaluation of the itchiness of ramie fabrics

[0152] The test of the itching sensation of ramie fabric is carried out according to FZ / T 30005-2009 "Evaluation method for the itching sensation of ramie fabric", and the evaluation is divided into 5 levels, level 1 is no itching, level 2 is slightly itchy, level 3 is itchy, level 4 is very itchy, and level 5 is extremely itchy.

[0153] Table 1 Effect of pectinase addition on pricking sensation during ramie fabric modification process

[0154] Enzyme addition amount 1％ 2％ 3％ 4％ 5％ Itch level 3.6 3.0 3.8 4.0 3.8

[0155] Table 2 Effect of xylanase addition on itching during ramie fabric modification

[0156] Enzyme addition amount 1％ 2％ 3％ 4％ 5％ Itch level 3.8 3.8 3.6 3.2 3.8

[0157] Table 3 Effect of hemicellulase addition on irritation during ramie fabric modification

[0158] Enzyme addition amount 1％ 2％ 3％ 4％ 5％ Itch level 4.0 3.0 3.2 3.4 4.0

[0159] Table 4 Effect of cellulase addition on itching during ramie fabric modification process

[0160] Enzyme addition amount 1％ 2％ 3％ 4％ 5％ Itch level 4.0 3.8 3.0 3.4 3.4

[0161] Table 5 Effect of laccase addition on itching during ramie fabric modification process

[0162] Enzyme addition amount 1％ 2％ 3％ 4％ 5％ Itch level 4.2 3.8 3.4 3.6 4.0

[0163] Table 6 Effect of alkaline protease addition on irritation during ramie fabric modification

[0164] Enzyme addition amount 1％ 2％ 3％ 4％ 5％ Itch level 3.8 3.2 3.6 3.8 3.8

[0165] Table 7 Effects of different bioenzyme combinations on the itching sensation during the modification process of ramie fabrics

[0166] Group Name Example 1 Comparative Example 7 Comparative Example 8 Comparative Example 9 Itch level 1.6 2.8 2.4 2.4 Group Name Comparative Example 10 Comparative Example 11 Comparative Example 12 Comparative Example 13 Itch level 2.2 2.4 2.2 2.4 Group Name Comparative Example 14 Comparative Example 15 Comparative Example 16 Comparative Example 17 Itch level 2.2 2.6 2.8 2.0

[0167] Table 8 Effect of modified ramie fabric segmented process and integrated process on itching

[0168] Process Name Example 1 Comparative Example 18 Comparative Example 19 Itch level 1.6 2.6 2.2 Process Name Untreated ramie fabric Comparative Example 20 Comparative Example 21 Itch level 4.6 2.4 2.8

[0169] Table 9 Effect of pure bio-enzyme process and chemical bio-enzyme combined process on irritation of ramie fabric modification

[0170] Process Name Example 1 Comparative Example 22 Itch level 1.6 2.0

[0171] 2. SEM analysis of ramie fabric surface morphology

[0172] The ramie fabric was dried and attached to the surface of the experimental sample table with conductive double-sided tape for gold spraying. The fiber morphology of the ramie fabric surface was observed using a SU3500 scanning electron microscope (provided by Hitachi High-Technologies Co., Ltd. / Japan). The surface morphology of the ramie fabric before and after modification is shown in Figure 2. Figure 1 .

[0173] Depend on Figure 1 It can be seen that the surface hairiness of the modified ramie fabric is significantly reduced, so the itchiness of the modified ramie fabric is significantly reduced.

[0174] 3. Fourier infrared spectroscopy analysis of ramie fabric

[0175] The surface chemical structure of ramie fabric was determined by Fourier transform infrared spectrometer (IRSpirit, Shimadzu, Japan). Dry KBr powder was added under an infrared lamp, ground evenly, and pressed into tablets. The scanning range was set to 4000 cm -1 ~400cm -1 wavelength, scanning times 32 times, resolution 4cm -1 The infrared spectrum test results of ramie fabric before and after modification are as follows: Figure 2 .

[0176] Depend on Figure 2 It can be seen that the characteristic peaks of ramie fabric before and after modification did not change significantly, indicating that the bio-enzyme treatment would not significantly change the elemental composition of ramie fabric.

[0177] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0178] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for modifying ramie fabric, characterized in that: The following steps are involved: S1, first placing the ramie fabric in a first buffer solution containing pectinase at pH 3.5-4.5 for reaction, and after the reaction is completed, taking out the ramie fabric; S2, placing the ramie fabric treated in step S1 in a second buffer solution containing a complex enzyme at a pH of 4.8-5.5 for reaction, and after the reaction is completed, taking out the ramie fabric; S3, placing the ramie fabric treated in step S2 in a third buffer solution containing alkaline protease at a pH of 7.0-8.0 for reaction to obtain a modified ramie fabric; The content of pectinase in the first buffer is 1.5%-2.5%; the second buffer includes 3.5%-4.5% xylanase, 1.5%-3.0% hemicellulase, 2.5%-3.5% cellulase and 2.5%-4% laccase; the content of alkaline protease in the third buffer is 1.5%-3.0%.

2. The method for modifying ramie fabric according to claim 1, characterized in that: The content of pectinase in the first buffer is 2%; the second buffer includes 4% xylanase, 2% hemicellulase, 3% cellulase and 3% laccase; and the concentration of alkaline protease in the third buffer is 2%.

3. The method for modifying ramie fabric according to claim 1, characterized in that: The first buffer solution has a pH of 4, the second buffer solution has a pH of 5, and the third buffer solution has a pH of 7.

6.

4. The method for modifying ramie fabric according to claim 1, characterized in that: The bath ratio in steps S1, S2 and S3 is 1:10-1:

20.

5. The method for modifying ramie fabric according to claim 1, characterized in that: In step S1, the reaction temperature is 45-55°C; in step S2, the reaction temperature is 45-55°C; in step S3, the reaction temperature is 45-55°C.

6. The method for modifying ramie fabric according to claim 1, characterized in that: In step S1, the reaction time is 50-60 min; in step S2, the reaction time is 50-60 min; in step S3, the reaction time is 50-60 min.

7. The method for modifying ramie fabric according to claim 1, characterized in that: The first buffer, the second buffer and the third buffer are each independently one of a citrate buffer and a PBS buffer.

8. The method for modifying ramie fabric according to claim 1, characterized in that: The ramie fabric can be knitted and / or woven.

9. Ramie fabric obtained by the modification method according to any one of claims 1 to 8.

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