Shrink-proof treatment agent and treatment method for cashmere fabric

Abstract

The invention relates to a shrink-proof treatment agent and a treatment method for cashmere fabrics, in particular to the technical field of fabric treatment agents, and the shrink-proof treatment agent is obtained by adding sulfonic xanthan gum into water, stirring to obtain sol, adding chlorate, a plasticizer and a surfactant into the sol, and uniformly stirring; wherein the mass percentage of the sulfonic acid group xanthan gum in the shrink-proof treatment agent is 20-30%. When the shrink-proof finishing agent provided by the invention is used for treating the cashmere fabric, the shrink-proof and shape-preserving performance of the fabric can be improved, meanwhile, the softness of the cashmere fabric is ensured, the hand feeling of the cashmere fabric is improved, and the wearability of the cashmere fabric is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fabric treatment agents, and in particular relates to an anti-shrinkage treatment agent for cashmere fabrics and a treatment method. Background Art

[0002] Cashmere fabrics have many excellent properties such as good elasticity, strong moisture absorption, good warmth retention, soft luster, etc. However, unfinished cashmere fabrics will shrink under constant squeezing and rubbing during washing, causing changes in the appearance of the fabric such as size reduction, affecting the appearance and wearing performance of the fabric.

[0003] The main reason for the felting of cashmere fabrics is the directional friction effect caused by the scale layer structure of wool and the curling and elasticity of wool. Therefore, the method to prevent wool fabrics from felting is based on how to reduce the directional friction effect and change the unidirectional movement tendency of wool. In summary, there are two measures: destroying the scale layer and depositing polymer (or resin) on the fiber surface. In actual application, improper handling of the former will cause the mechanical properties of the fabric to decrease, and the latter will reduce the softness and feel of the fabric due to the film formed, both of which are not conducive to improving the wearing performance of cashmere fabrics. Summary of the invention

[0004] The purpose of the present invention is to provide a cashmere fabric shrinkage-resistant treatment agent and treatment method in order to solve the above-mentioned problem.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] As a first aspect of the present invention, the present invention provides a shrinkage-proof treatment agent for cashmere fabrics, wherein the shrinkage-proof treatment agent is prepared by first adding sulfonated xanthan gum into water and stirring to obtain a sol, and then adding chloride, a plasticizer and a surfactant into the sol and stirring evenly; wherein the mass percentage of the sulfonated xanthan gum in the shrinkage-proof treatment agent is 20-30%.

[0007] As a further optimization scheme of the present invention, the preparation method of the sulfonated xanthan gum is as follows: 0.01 mol of xanthan gum is added to 50 ml of N, N-dimethylformamide solution, heated and stirred in an oil bath at 50° C. for 30 minutes, 0.06 mol of aminosulfonic acid and urea are added, and stirring is continued. The mixture is reacted at 65-85° C. for 2-4 hours, and then filtered and washed with 70% ethanol solution. The filter cake is dried in an oven at 50° C., and ground and crushed to obtain the sulfonated xanthan gum.

[0008] As a further optimization scheme of the present invention, the chloride salt is sodium chloride or ammonium chloride, and the mass percentage of the chloride salt in the shrinkage-proofing agent is 0.2-2%.

[0009] As a further optimization scheme of the present invention, the mass percentage of the plasticizer and the surfactant in the shrinkage-proofing agent is 0.5-1%, the plasticizer is tributyl citrate, and the surfactant is an N-acylamino acid type surfactant.

[0010] As a second aspect of the present invention, the present invention also provides a method for shrinkage-proofing cashmere fabric using any of the shrinkage-proofing agents described above, comprising the following steps:

[0011] (1) Plasma treatment of dry cashmere fabric;

[0012] (2) preparing a shrinkage-resistant finishing agent, adding sulfonic acid xanthan gum to water and stirring to obtain a sol, then adding chloride, a plasticizer and a surfactant to the sol and stirring evenly for standby use;

[0013] (3) Shrinkage-proof finishing: the cashmere fabric treated in step (1) is shrunken at 1 cm 2 5-10 mL of the fabric is placed in the shrink-proof finishing agent prepared in step (2) for padding;

[0014] (4) After finishing, first dry the finished wool fabric at 70-80℃ for 3-5min, then wash the cashmere fabric with hot water at 50-60℃, and finally dry the washed cashmere fabric with hot air.

[0015] As a further optimization scheme of the present invention, in the plasma treatment process of step (1), the working gas is oxygen, the plasma treatment power is 200-220W, and the treatment time is 30-50s.

[0016] As a further optimization scheme of the present invention, the padding finishing process conditions in step (3) are specifically two dips and two pads, the padding rate is 80-85%, and the padding temperature is 50-65°C.

[0017] As a further optimization scheme of the present invention, the process conditions of hot air drying in step (4) are a wind speed of 3-5 m / s and a drying temperature of 30-60°C.

[0018] The beneficial effects of the present invention are:

[0019] (1) The present invention first destroys the scale layer on the surface of cashmere through the etching effect of plasma, changes the directional friction effect of wool fibers, and at the same time cooperates with an anti-shrinkage finishing agent to bond the fibers to form a thin film on the surface of the fabric to achieve the purpose of anti-felting of the fabric without affecting the feel of the cashmere fabric, thereby further improving the wearing performance of the cashmere fabric.

[0020] (2) The present invention uses sulfonated xanthan gum with good biocompatibility as a component of the finishing agent. On the one hand, by utilizing the characteristics of sulfonated xanthan gum as a natural high molecular polymer, the finishing agent is bonded between fibers, so that the cashmere fabric has shrinkage resistance and shape retention. On the other hand, the antibacterial property of the sulfonated xanthan gum further improves the antibacterial property of the treated cashmere fabric. DETAILED DESCRIPTION

[0021] The present application is described in further detail below. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] 1. Materials and Methods

[0023] In the following examples, any method not specified may be carried out according to conventional methods, and the materials, reagents, etc. used may be obtained through commercial channels unless otherwise specified.

[0024] Among them, the plasticizer is tributyl citrate, and the surfactant is an N-acylamino acid type surfactant, both of which were purchased from Shandong Jinyufeng New Materials; aminosulfonic acid was purchased from Shandong Kuoda Biotechnology.

[0025] The anti-felting finishing agent is of polyurethane type, and its brand and model is protolan 367 from Rotta Company of Germany. 2. Specific embodiments

[0027] Example 1

[0028] This embodiment provides a method for shrinkage-proofing cashmere fabric, comprising the following steps:

[0029] (1) The dried cashmere fabric is placed in a low-temperature atmosphere for plasma treatment, the working gas is oxygen, the temperature is 40°C, the plasma treatment power is 200W, and the treatment time is 50s;

[0030] (2) preparing a shrinkage-resistant finishing agent, first preparing sulfonic acid xanthan gum, adding 0.01 mol of xanthan gum to 50 ml of N, N-dimethylformamide solution, stirring in a 50° C. oil bath for 30 min, then adding 0.06 mol of aminosulfonic acid and urea and continuing to stir, reacting at 65° C. for 4 h, then filtering and washing with 70% ethanol solution, drying the filter cake in an oven at 50° C., grinding and crushing to obtain sulfonic acid xanthan gum, then adding sulfonic acid xanthan gum to water and stirring to obtain a sol, then adding sodium chloride, a plasticizer and a surfactant to the sol and stirring evenly for use;

[0031] Wherein, in the shrinkage-proof treatment agent, the mass percentage of sulfonic acid xanthan gum is 20%, the mass percentage of sodium chloride is 2%, and the mass percentage of plasticizer and surfactant is 1%.

[0032] (3) Shrinkage-proof finishing: the cashmere fabric treated in step (1) is shrunken at 1 cm 2 10 mL of the fabric is placed in the shrink-proof finishing agent prepared in step (2) for padding finishing; wherein the padding finishing process conditions are specifically two dips and two pads, the padding rate is 85%, the padding temperature is 50° C., and the single padding time is 10 min.

[0033] (4) Post-finishing: first, dry the finished wool fabric at 70°C for 5 minutes, then wash the cashmere fabric with hot water at 50°C, and finally dry the washed cashmere fabric with hot air at a speed of 3m / s and a drying temperature of 60°C.

[0034] Example 2

[0035] This embodiment provides a method for shrinkage-proofing cashmere fabric, comprising the following steps:

[0036] (1) The dried cashmere fabric was placed in a low-temperature atmosphere for plasma treatment, the working gas was oxygen, the temperature was 40°C, the plasma treatment power was 220W, and the treatment time was 30s;

[0037] (2) preparing a shrinkage-resistant finishing agent, and preparing the sulfonic acid xanthan gum in the same manner as in Example 1, then adding the sulfonic acid xanthan gum into water and stirring to obtain a sol, and then adding ammonium chloride, a plasticizer, and a surfactant into the sol and stirring to obtain a sol for later use;

[0038] Wherein, in the shrinkage-proofing agent, the mass percentage of sulfonic acid xanthan gum is 30%, the mass percentage of ammonium chloride is 0.2%, and the mass percentage of plasticizer and surfactant is 0.5%.

[0039] (3) Shrinkage-proof finishing: the cashmere fabric treated in step (1) is shrunken at 1 cm 2 5 mL of the fabric is placed in the shrink-proof finishing agent prepared in step (2) for padding finishing; wherein the padding finishing process conditions are specifically two dips and two pads, the padding rate is 80%, the padding temperature is 65° C., and the single padding time is 10 min.

[0040] (4) Post-finishing: first, the finished wool fabric is dried at 80°C for 3 minutes, then, the cashmere fabric is washed with hot water at 60°C, and finally, the washed cashmere fabric is hot-air dried at a speed of 5 m / s and a drying temperature of 30°C.

[0041] Example 3

[0042] This embodiment provides a method for shrinkage-proofing cashmere fabric, comprising the following steps:

[0043] (1) The dried cashmere fabric is placed in a low-temperature atmosphere for plasma treatment, the working gas is oxygen, the temperature is 40°C, the plasma treatment power is 200W, and the treatment time is 50s;

[0044] (2) The method for preparing sulfonic acid xanthan gum is the same as that in Example 1, then, the sulfonic acid xanthan gum is added to water and stirred to obtain a sol, and then sodium chloride, a plasticizer and a surfactant are added to the sol and stirred evenly for later use;

[0045] Wherein, in the shrinkage-proof treatment agent, the mass percentage of sulfonic acid xanthan gum is 25%, the mass percentage of sodium chloride is 1%, and the mass percentage of plasticizer and surfactant is 0.75%;

[0046] (3) The steps of shrinkage-proof finishing are the same as those in Example 1;

[0047] (4) The post-processing steps are the same as those in Example 1.

[0048] Verification test

[0049] 1. In order to explore the effect of adding sulfonic acid xanthan gum in the formula of shrinkage-resistant finishing agent on the performance of cashmere fabric, the shrinkage-resistant finishing agent was prepared according to the formula given in Table 1.

[0050] Table 1. Component formula design of shrinkage-resistant finishing agent

[0051]

[0052]

[0053] According to the shrinkage-proof treatment method for cashmere fabric disclosed in Example 1, fabric samples A1-A6 were obtained by treating with finishing agents A1-A6 in sequence. In addition, the cashmere fabric that was not subjected to the shrinkage-proof treatment in step (3) was used as control group 1; the cashmere fabric that was not subjected to the plasma treatment in step (1) was used as control group 2; and the cashmere fabric that was not subjected to any treatment step was used as a blank control group.

[0054] First, the fabric samples were tested for anti-felting properties and comprehensive hand feel values.

[0055] (1) Anti-felting test

[0056] With reference to GB8629.2001 and ISWTMNO.31 test standards, a fully automatic shrinkage tester was used to test the machine wash felt shrinkage of fabric samples. The fabric samples were cut into specifications of 500mm×500mm, and 3 groups of marks were made in the warp and weft directions of the samples. Before the test, the distance between the marks was measured to calculate the marked area, which was used as the original size S0 of the fabric. The wool samples were then washed according to the standard procedure (7A+3×5A), and the washing temperature was set to 40°C. After the test, the wool samples were balanced under standard atmospheric conditions (temperature 20±1°C, relative humidity 65±5%) for 48 hours, and the distance between the marks was measured again to calculate the fabric area S after washing. l The felt shrinkage of the fabric is calculated using the following formula: felt shrinkage S% = (S0-S1) / S0×100%.

[0057] (2) Comprehensive feel value test

[0058] According to the article “Zhou Jianping, Chen Sheng. Analysis and Application of KES Fabric Style Tester Test Indicators[J]”, the KES fabric style tester was used to test the comprehensive feel value of wool fabric (0-5, 5 is excellent).

[0059] The results are shown in Table 2.

[0060] Table 2. Statistical table of anti-felting and comprehensive hand feel test results

[0061]

[0062]

[0063] It can be seen from Table 2 that compared with the original cashmere fabric without any finishing, the plasma treatment combined with the shrinkage-proof finishing agent treatment can improve the shrinkage-proof performance and feel of the cashmere fabric. The plasma etching action causes the scale layer on the cashmere surface to be destroyed, changing the directional friction effect of the wool fiber. At the same time, the shrinkage-proof finishing agent is used to bond the fibers to each other and form a thin film on the fabric surface, thereby achieving the purpose of preventing the fabric from shrinking.

[0064] In addition, by comparing fabric samples A2, A4 and A5, it can be seen that sulfonic acid xanthan gum, as a natural high molecular polymer, has excellent adhesive properties and biocompatibility. Using it as a finishing agent has a better effect on improving the shrinkage resistance and feel of cashmere fabric than using polylactic acid, and is also better than the commonly used polyurethane anti-felting finishing agent on the market.

[0065] By comparing the results of fabric samples A1-A3, it can be seen that the application effect of sulfonated xanthan gum is dosage-dependent. When the dosage increases from 25% to 30%, the anti-shrinkage performance of the fabric is not significantly improved and the feel of the fabric decreases accordingly.

[0066] Secondly, the antibacterial properties of the fabric samples were tested.

[0067] According to GB / T 20944.2-2007 "Evaluation of Antimicrobial Properties of Textiles Part 2: Absorption Method", the test bacteria are Escherichia coli 8099 (Gram-negative bacteria) and Staphylococcus aureus ATCC6538. According to the standard, each fabric sample was cut into 20mm×20mm size and antibacterial test was carried out after 50 washes. The results are shown in Table 3.

[0068] Table 3. Statistical table of antibacterial performance test results

[0069]

[0070] As can be seen from Table 3, the antibacterial property of cashmere fabric can be improved by plasma treatment combined with shrink-proof finishing agent treatment. Plasma treatment grafts a large number of amino, hydroxyl and other active groups on the surface of the fabric, causing oxidation reactions and denaturation of proteins and nucleic acids in bacteria, molds and viruses, thereby improving the antibacterial property of the fabric. In addition, by comparing fabric samples A2 and A4 with control group 1, it can be seen that the use of sulfonic acid xanthan gum in the shrink-proof finishing agent has a positive effect on improving the antibacterial property of the fabric.

[0071] 2. In order to explore the effect of adding chloride salt in the formula of shrinkage-resistant finishing agent on the performance of cashmere fabric, the shrinkage-resistant finishing agent was prepared according to the formula given in Table 2.

[0072] Table 4. Shrinkage-resistant finishing agent component formula design

[0073]

[0074] According to the shrinkage-proof treatment method for cashmere fabric disclosed in Example 1, fabric samples B1-B5 were treated with finishing agents B1-B5 in sequence, and the tensile strength and moisture permeability of the fabric samples were tested. In addition, the cashmere fabric without any treatment was used as a blank control group.

[0075] (1) Tensile strength test The sample was subjected to stress-strain test using a Q800 dynamic mechanical analyzer (DMA, TA Instruments, Inc., USA) to determine the strength and elastic modulus of the sample. The sample was cut into strips of 30×10 mm in size and placed in a tensile fixture with one end fixed and the other end movable with the fixture. The temperature was maintained at 20°C, the frequency was set to 1 Hz, and the stress was applied gradually increasing from 0 at a rate of 5 MPa / s. The strain change of the sample was recorded until the sample broke. The stress at the breaking point was taken as the tensile strength of the sample.

[0076] (2) Moisture permeability test According to the national standard GB / T12704.1-2009 (a), the moisture permeability of the samples was tested using the FX3180 moisture permeability measuring instrument. During the test, the temperature was 38°C, the humidity was 90.0%, the air flow rate was 0.5m / s, and the test area was 25.0cm 2 Before the test, the test chamber needs to be pre-humidified. After the automatic humidity adjustment is completed, the instrument starts the moisture permeability test and automatically records the moisture permeability data once every hour, twice in total. After the experiment is completed, the moisture permeability data of the sample is manually recorded, and the average of 5 groups of experimental data for each group of samples is used as the final data.

[0077] The results are shown in Table 5.

[0078] Table 5. Statistical table of tensile strength and moisture permeability test results

[0079]

[0080] It can be seen from Table 5 that compared with the blank control group, the strength and moisture permeability of the finished cashmere fabric are improved to a certain extent. The sulfonic acid xanthan gum used in the shrinkage-proof treatment agent is a natural high molecular polymer, which adheres between the fibers of the cashmere fabric and helps to improve the strength of the fabric fibers.

[0081] In addition, by comparing fabric samples B1, B4 and fabric sample B5, it can be seen that adding chloride salt to the shrinkage-resistant finishing agent can improve the moisture permeability of cashmere fabric to a certain extent. It is speculated that this is because the addition of chloride salt changes the pore structure of the film formed by the shrinkage-resistant finishing agent on the fabric surface.

[0082] In addition, by comparing fabric samples B1-B3, it can be seen that the moisture permeability of cashmere fabric increases with the increase of sodium chloride dosage. However, according to the tensile strength performance results of fabric samples, when the addition of sodium chloride exceeds 2%, for example, 5%, it will be unfavorable to improve the strength of fabric samples. It is speculated that excessive addition of sodium chloride will affect the structure of the film formed on the surface of the fabric and thus be unfavorable for the film to exert its strength performance, which leads to the tensile strength of fabric sample B3 not significantly improved compared with the blank control group, and is not as good as fabric samples B1-B2.

[0083] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. 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, which all belong to the protection scope of the present invention.

Claims

1. A shrinkage-resistant treatment agent for cashmere fabric, characterized in that: The shrink-proof treatment agent is prepared by first adding sulfonic acid xanthan gum into water and stirring to obtain a sol, then adding chloride salt, plasticizer and surfactant into the sol and stirring evenly; wherein the mass percentage of the sulfonic acid xanthan gum in the shrink-proof treatment agent is 20-30%.

2. The shrinkage-resistant treatment agent for cashmere fabric according to claim 1, characterized in that: The preparation method of the sulfonated xanthan gum comprises the following steps: adding 0.01 mol of xanthan gum to 50 ml of N,N-dimethylformamide solution, stirring in a 50° C. oil bath for 30 minutes, adding 0.06 mol of aminosulfonic acid and urea, and continuing to stir, reacting at 65-85° C. for 2-4 hours, and then filtering and washing with a 70% ethanol solution, drying the filter cake in an oven at 50° C., and grinding and crushing to obtain the sulfonated xanthan gum.

3. The shrinkage-resistant treatment agent for cashmere fabric according to claim 1, characterized in that: The chloride salt is sodium chloride or ammonium chloride, and the mass percentage of the chloride salt in the shrinkage-proofing agent is 0.2-2%.

4. The shrinkage-resistant treatment agent for cashmere fabric according to claim 1, characterized in that: The mass percentage of the plasticizer and the surfactant in the shrinkage-proof treatment agent is 0.5-1%, the plasticizer is tributyl citrate, and the surfactant is an N-acylamino acid type surfactant.

5. A method for shrinkage-proofing cashmere fabric using the shrinkage-proofing agent according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Plasma treatment of dry cashmere fabric; (2) preparing a shrinkage-resistant finishing agent, adding sulfonic acid xanthan gum to water and stirring to obtain a sol, then adding chloride, a plasticizer and a surfactant to the sol and stirring evenly for standby use; (3) Shrinkage-proof finishing: the cashmere fabric treated in step (1) is shrunken at 1 cm 2 5-10 mL of the fabric is placed in the shrink-proof finishing agent prepared in step (2) for padding; (4) After finishing, first dry the finished wool fabric at 70-80℃ for 3-5min, then wash the cashmere fabric with hot water at 50-60℃, and finally dry the washed cashmere fabric with hot air.

6. The method for processing a shrinkage-resistant treatment agent for cashmere fabric according to claim 5, characterized in that: In the plasma treatment process of step (1), the working gas is oxygen, the plasma treatment power is 200-220W, and the treatment time is 30-50s.

7. The method for processing a cashmere fabric shrinkage-resistant agent according to claim 5, characterized in that: The padding finishing process conditions in step (3) are specifically two dips and two pads, the padding rate is 80-85%, and the padding temperature is 50-65°C.

8. The method for processing a shrinkage-resistant treatment agent for cashmere fabric according to claim 5, characterized in that: The process conditions for hot air drying in step (4) are a wind speed of 3-5 m / s and a drying temperature of 30-60°C.

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