A method for improving the whiteness of fabric containing soybean fiber

Abstract

The present invention relates to a method for improving the whiteness of fabrics containing soybean fibers, which introduces a one-bath two-step low-temperature bleaching process. In the first stage, hydrogen peroxide is used to generate a high-efficiency peroxy acid bleach in a weak acid environment regulated by citric acid, and the bleaching efficiency of the fabric is significantly improved in combination with the chelating effect of citric acid. In the second stage, two biocompatible components, sericin and chitosan, are introduced. The excellent film-forming property, biocompatibility and air permeability of sericin are used to synergize with chitosan to form a tight and stable protective layer on the fiber surface through a precise hydrogen bond network and electrostatic attraction, or directly adhere in the form of membrane fragments, effectively resisting free radical damage and yellow pigment fading caused by sunlight, and significantly enhancing the toughness and sunlight resistance of the fabric. This scheme not only achieves an efficient and environmentally friendly bleaching effect, but also gives the fabric excellent protective properties.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, and in particular to a method for improving the whiteness of fabrics containing soybean fibers. Background Art

[0002] Soy protein fiber, as an innovative material that combines soy protein and polyvinyl alcohol, significantly improves the moisture absorption, antibacterial and dyeing properties of traditional polyvinyl alcohol fiber through wet spinning and cross-linking treatment. However, the widespread application of this fiber is limited by its bleaching process difficulties, especially the presence of natural yellow impurities, which causes the fiber to fade easily under light, seriously affecting the sun resistance and aesthetics of light-colored products.

[0003] At present, although sodium hypochlorite can achieve low-temperature bleaching with its efficient oxidation capacity, the accompanying organic halide pollution problem cannot be ignored. In response to the call for environmental protection, the hydrogen peroxide plus alkali process has become the mainstream, but it relies on high temperatures above 95°C and has high energy consumption. Although patent CN103526601A proposes a hydrogen peroxide-tetraacetylethylenediamine low-temperature bleaching scheme, attempting to balance the influence of temperature and environment, it is still insufficient in improving whiteness, especially for light and bright colors. There are problems such as dull color and poor sunlight resistance, which makes it difficult to meet the high-end textile market. In addition, although Cui Shizhong's research achieved higher whiteness through reduction bleaching, it was at the expense of fabric strength, further highlighting the challenge of balancing whiteness and physical properties.

[0004] In view of this, the development of a new bleaching technology that can not only significantly improve the whiteness of soybean fiber fabrics but also effectively protect and enhance their physical properties has become the key to promoting the high-quality development of the soybean fiber industry. Summary of the invention

[0005] The invention aims to improve the whiteness of soybean fiber fabric and effectively protect and enhance its physical properties.

[0006] To achieve the above objectives, this application is implemented through the following technical solutions:

[0007] The present application provides a method for improving the whiteness of fabric containing soybean fiber, comprising the following steps:

[0008] S1, mixing soap powder, soda ash and deionized water, stirring thoroughly and heating to 70°C to 85°C to obtain a first treatment solution, adding fabric to the first treatment solution, and keeping the temperature at 70°C to 85°C for 5min to 15min, then taking out the fabric and washing it with clean water;

[0009] S2, mixing the fabric treated in step S1 with deionized water at a bath ratio of 1:20, adjusting the pH of the deionized water to 6-7 with glacial acetic acid, adding hydrogen peroxide, a refining agent, and citric acid, mixing thoroughly, and heating to 45° C.-60° C. to obtain a second treatment solution, and keeping the fabric in the second treatment solution for 15 min-30 min;

[0010] S3, adding hydrogen peroxide, sericin and chitosan to the second treatment liquid of step S2, stirring and mixing, heating to 75° C. to 90° C. to obtain a third treatment liquid, keeping the fabric in the third treatment liquid for 30 min to 40 min, then taking out the fabric and washing it with clean water;

[0011] S4, fully mixing the soap powder and deionized water to obtain a fourth treatment liquid with a soap powder concentration of 0.2g / L to 0.5g / L, heating the fourth treatment liquid to 50°C to 60°C, adding the fabric treated in step S3 to the fourth treatment liquid, and keeping it at 50°C to 60°C for 5min to 15min, then taking out the fabric, washing it with clean water, and drying it.

[0012] As a further improvement of the present application, in step S1, in the first treatment liquid, the concentration of the soap powder is 2g / L to 5g / L, the concentration of the soda ash is 1g / L to 3g / L, and the bath ratio of the fabric to the first treatment liquid is 1:20.

[0013] As a further improvement of the present application, in step S2, in the second treatment liquid, the concentration of hydrogen peroxide is 5g / L to 8g / L, the concentration of the refining agent is 3g / L to 5g / L, and the concentration of citric acid is 3g / L to 5g / L.

[0014] As a further improvement of the present application, in step S3, in the third treatment liquid, the concentration of hydrogen peroxide is 8 g / L to 12 g / L, the concentration of sericin is 2 g / L to 5 g / L, and the concentration of chitosan is 1 g / L to 3 g / L.

[0015] As a further improvement of the present application, step S3 further includes the step of continuing to add polyvinyl methyl ether to the third treatment liquid.

[0016] As a further improvement of the present application, in the third treatment liquid, the concentration of the polyvinyl methyl ether is 2 g / L to 4 g / L.

[0017] As a further improvement of the present application, step S5 is further included after step S3 and before step S4, wherein the fluorescent whitening agent, sodium sulphate and deionized water are mixed, fully stirred and heated to 60°C to 75°C to obtain a fifth treatment liquid, the fabric is added to the fifth treatment liquid, and kept warm at 60°C to 75°C for 5min to 15min, then the fabric is taken out and washed with clean water.

[0018] As a further improvement of the present application, in the fifth treatment liquid, the concentration of the fluorescent whitening agent is 0.3g / L to 0.5g / L, the concentration of the sodium sulfate is 0.8g / L to 1g / L, and the bath ratio of the fabric to the fifth treatment liquid is 1:20.

[0019] As a further improvement of the present application, the fluorescent whitening agent is at least one of BLH, 4BK, ER-I, ER-II, PF / DT, BA, CXT, R4, MST, BAC, SWN / AW, WGS, and NFW.

[0020] As a further improvement of the present application, the hydrogen peroxide is industrial grade hydrogen peroxide, the concentration of the hydrogen peroxide is 25 g / L to 35 g / L, and the sericin is sericin powder.

[0021] The beneficial effects of this application are as follows:

[0022] 1) In the technical solution of the present application, hydrogen peroxide is used in a weak acid environment regulated by citric acid to generate a highly efficient peroxy acid bleach, which, with the assistance of the chelating effect of citric acid, significantly enhances the bleaching efficiency of fabrics.

[0023] 2) This technical solution innovatively combines the two major components of sericin and chitosan. With its excellent film-forming properties, biocompatibility and breathability, sericin synergizes with chitosan made by deacetylation of chitin to significantly improve biocompatibility. At the molecular level, the two are intertwined through a precise hydrogen bond network and electrostatic attraction to form a tight and stable membrane structure, or directly adhere to the fiber surface in the form of membrane fragments, providing a natural protective layer for the fiber. This innovative combination not only effectively protects the fiber from free radicals, but also significantly enhances the strength of the fabric, and effectively resists the fading of yellow pigments caused by sunlight, showing an excellent protective effect. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solution of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with specific implementation methods.

[0026] Example 1

[0027] This embodiment provides a method for improving the whiteness of a fabric containing soybean fiber, comprising the following steps:

[0028] S1. Mix soap powder, soda ash and deionized water, stir well and heat to 75°C to obtain a first treatment solution, add the fabric to the first treatment solution, keep the temperature at 75°C for 10 minutes, then take out the fabric and wash with clean water; in the first treatment solution, the concentration of the soap powder is 3g / L, the concentration of the soda ash is 2g / L, and the bath ratio of the fabric to the first treatment solution is 1:20.

[0029] S2, mixing the fabric treated in step S1 with deionized water at a bath ratio of 1:20, adjusting the pH of the deionized water to 6-7 with glacial acetic acid, adding hydrogen peroxide, a refining agent, and citric acid, mixing thoroughly, and heating to 55° C. to obtain a second treatment solution, and keeping the fabric in the second treatment solution for 20 minutes; in the second treatment solution, the concentration of the hydrogen peroxide is 6 g / L, the concentration of the refining agent is 4 g / L, and the concentration of the citric acid is 4 g / L.

[0030] S3. Continue to add hydrogen peroxide, sericin and chitosan to the second treatment liquid treated in step S2, fully stir and mix, and heat to 85° C. to obtain a third treatment liquid. Keep the fabric in the third treatment liquid for 35 minutes, then take out the fabric and wash it with clean water. In the third treatment liquid, the concentration of hydrogen peroxide is 10 g / L, the concentration of sericin is 3 g / L, and the concentration of chitosan is 2 g / L.

[0031] S4, fully mixing the soap powder and deionized water to obtain a fourth treatment liquid with a soap powder concentration of 0.25 g / L, heating the fourth treatment liquid to 55° C., adding the fabric treated in step S3 to the fourth treatment liquid, and keeping the temperature at 55° C. for 10 min, then taking out the fabric, washing it with clean water, and drying it.

[0032] Example 2

[0033] This embodiment provides a method for improving the whiteness of a fabric containing soybean fiber, comprising the following steps:

[0034] S1. Mix soap powder, soda ash and deionized water, stir well and heat to 70°C to obtain a first treatment solution, add the fabric to the first treatment solution, keep the temperature at 70°C for 15 minutes, then take out the fabric and wash with clean water; in the first treatment solution, the concentration of the soap powder is 2g / L, the concentration of the soda ash is 1g / L, and the bath ratio of the fabric to the first treatment solution is 1:20.

[0035] S2, mixing the fabric treated in step S1 with deionized water at a bath ratio of 1:20, adjusting the pH of the deionized water to 6-7 with glacial acetic acid, adding hydrogen peroxide, a refining agent, and citric acid, mixing thoroughly, and heating to 45° C. to obtain a second treatment solution, and keeping the fabric in the second treatment solution for 30 minutes; in the second treatment solution, the concentration of the hydrogen peroxide is 5 g / L, the concentration of the refining agent is 3 g / L, and the concentration of the citric acid is 3 g / L.

[0036] S3. Continue to add hydrogen peroxide, sericin and chitosan to the second treatment liquid treated in step S2, stir and mix thoroughly, and heat to 75° C. to obtain a third treatment liquid. Keep the fabric in the third treatment liquid for 40 minutes, then take out the fabric and wash it with clean water. In the third treatment liquid, the concentration of hydrogen peroxide is 8 g / L, the concentration of sericin is 2 g / L, and the concentration of chitosan is 1 g / L.

[0037] S4, fully mix the soap powder and deionized water to obtain a fourth treatment solution with a soap powder concentration of 0.2 g / L, heat the fourth treatment solution to 50° C., add the fabric treated in step S3 to the fourth treatment solution, keep the temperature at 50° C. for 15 minutes, then take out the fabric, wash it with clean water, and dry it.

[0038] Example 3

[0039] This embodiment provides a method for improving the whiteness of a fabric containing soybean fiber, comprising the following steps:

[0040] S1. Mix soap powder, soda ash and deionized water, stir them thoroughly and heat them to 85°C to obtain a first treatment solution, add the fabric into the first treatment solution, keep it at 85°C for 5 minutes, then take out the fabric and wash it with clean water; in the first treatment solution, the concentration of the soap powder is 5g / L, the concentration of the soda ash is 3g / L, and the bath ratio of the fabric to the first treatment solution is 1:20.

[0041] S2, mixing the fabric treated in step S1 with deionized water at a bath ratio of 1:20, adjusting the pH of the deionized water to 6-7 with glacial acetic acid, adding hydrogen peroxide, a refining agent, and citric acid, mixing thoroughly, and heating to 60° C. to obtain a second treatment solution, and keeping the fabric in the second treatment solution for 15 minutes; in the second treatment solution, the concentration of the hydrogen peroxide is 8 g / L, the concentration of the refining agent is 5 g / L, and the concentration of the citric acid is 5 g / L.

[0042] S3. Continue to add hydrogen peroxide, sericin and chitosan to the second treatment liquid treated in step S2, stir and mix thoroughly, and heat to 90° C. to obtain a third treatment liquid. Keep the fabric in the third treatment liquid for 30 minutes, then take out the fabric and wash it with clean water. In the third treatment liquid, the concentration of hydrogen peroxide is 12 g / L, the concentration of sericin is 5 g / L, and the concentration of chitosan is 3 g / L.

[0043] S4, fully mix the soap powder and deionized water to obtain a fourth treatment liquid with a soap powder concentration of 0.5 g / L, heat the fourth treatment liquid to 60° C., add the fabric treated in step S3 to the fourth treatment liquid, keep it at 60° C. for 5 minutes, then take out the fabric, wash it with clean water, and dry it.

[0044] Example 4

[0045] The difference between this embodiment and embodiment 1 is that in step S3, hydrogen peroxide, sericin, chitosan and polyvinyl methyl ether are further added to the second treatment liquid treated in step S2, the mixture is fully stirred and heated to 85° C. to obtain a third treatment liquid, the fabric is kept warm in the third treatment liquid for 35 minutes, the fabric is taken out and washed with clean water; in the third treatment liquid, the concentration of hydrogen peroxide is 10 g / L, the concentration of sericin is 3 g / L, the concentration of chitosan is 2 g / L, and the concentration of polyvinyl methyl ether is 3 g / L.

[0046] Example 5

[0047] The difference between this embodiment and embodiment 4 is that the concentration of the polyvinyl methyl ether is 2 g / L.

[0048] Example 6

[0049] The difference between this embodiment and embodiment 4 is that the concentration of the polyvinyl methyl ether is 4 g / L.

[0050] Example 7

[0051] The difference between this embodiment and embodiment 4 is that after step S3 and before step S4, step S5 is further included, wherein the fluorescent whitening agent, sodium sulfate and deionized water are mixed, fully stirred and heated to 65°C to obtain a fifth treatment liquid, the fabric is added to the fifth treatment liquid, and the fabric is taken out after being kept warm at 65°C for 10 minutes, and washed with clean water. In the fifth treatment liquid, the concentration of the fluorescent whitening agent is 0.4g / L, the concentration of sodium sulfate is 0.9g / L, and the bath ratio of the fabric to the fifth treatment liquid is 1:20. The fluorescent whitening agent is LUVITEX BLH.

[0052] Example 8

[0053] The difference between this embodiment and embodiment 4 is that after step S3 and before step S4, step S5 is further included, wherein the fluorescent whitening agent, sodium sulfate and deionized water are mixed, fully stirred and heated to 60°C to obtain a fifth treatment liquid, the fabric is added to the fifth treatment liquid, and the fabric is taken out after being kept at 60°C for 15 minutes, and washed with clean water. In the fifth treatment liquid, the concentration of the fluorescent whitening agent is 0.3g / L, the concentration of sodium sulfate is 0.8g / L, and the bath ratio of the fabric to the fifth treatment liquid is 1:20.

[0054] Example 9

[0055] The difference between this embodiment and embodiment 4 is that after step S3 and before step S4, step S5 is further included, wherein the fluorescent whitening agent, sodium sulfate and deionized water are mixed, fully stirred and heated to 75°C to obtain a fifth treatment liquid, the fabric is added to the fifth treatment liquid, and the fabric is taken out after being kept at 75°C for 5 minutes, and washed with clean water. In the fifth treatment liquid, the concentration of the fluorescent whitening agent is 0.5 g / L, the concentration of sodium sulfate is 1 g / L, and the bath ratio of the fabric to the fifth treatment liquid is 1:20.

[0056] Example 10

[0057] The difference between this embodiment and embodiment 4 is that a dyeing process is added after step S4. The dyeing process of this application uses a conventional dyeing process, which is specifically:

[0058] Add active red dye to deionized water at room temperature, mix thoroughly to obtain an active red dye mixed solution, so that the mass percentage of the active red dye is 2%, place the fabric after step S4 into the active red dye mixed solution at a bath ratio of 1:10, stir thoroughly, add sodium sulfate to the mixed solution in batches, so that the concentration of sodium sulfate in the final mixed solution is 15g / L, and add sodium sulfate in the following steps: stir and mix the fabric and the active red dye mixed solution for 10 minutes, then add one-third of sodium sulfate, continue to stir and mix for 10 minutes, then add two-thirds of sodium sulfate, stir and mix thoroughly for a period of time, raise the temperature of the mixed solution to 70°C, stir and mix thoroughly, start to add soda ash in batches, first add one-third of soda ash to the mixed solution, stir and mix thoroughly for 10 minutes, then add one-third of soda ash, continue to stir and mix for 10 minutes, then add one-third of soda ash, continue to stir and mix for 40 minutes, take out the fabric, wash with clean water, and dry.

[0059] Embodiment 11

[0060] The difference between this embodiment and embodiment 7 is that a dyeing process is added after step S4. The dyeing process of this application uses a conventional dyeing process, which is specifically:

[0061] Add active red dye OWF to deionized water at room temperature, mix thoroughly to obtain an active red dye mixed solution, so that the mass percentage of active red dye OWF is 2%, and place the fabric after step S4 into the active red dye mixed solution at a bath ratio of 1:10. After sufficient stirring, add sodium sulfate to the mixed solution in batches, so that the concentration of sodium sulfate in the final mixed solution is 15 g / L. The step of adding sodium sulfate is as follows: after the fabric and the active red dye mixed solution are stirred and mixed for 10 minutes, one-third of sodium sulfate is added, and after continuing to stir and mix for 10 minutes, two-thirds of sodium sulfate is added. After stirring and mixing for a period of time, the temperature of the mixed solution is increased to 70°C. After stirring and mixing thoroughly, soda ash is added in batches, first one-third of soda ash is added to the mixed solution, after stirring and mixing thoroughly for 10 minutes, one-third of soda ash is added, after continuing to stir and mix for 10 minutes, one-third of soda ash is added, and after continuing to stir and mix for 40 minutes, the fabric is taken out, washed with clean water, and dried.

[0062] Comparative Example 1

[0063] The difference between this comparative example and Example 1 is that no sericin is added in step S3.

[0064] Comparative Example 2

[0065] The difference between this comparative example and Example 1 is that chitosan is not added in step S3.

[0066] Comparative Example 3

[0067] This comparative example uses a traditional oxygen bleaching process to treat the fabric, and the specific steps are as follows:

[0068] In the first step, soap powder, soda ash and deionized water are mixed to obtain a first mixed solution, wherein the concentration of soap powder is 3g / L and the concentration of soda ash is 2g / L. The fabric is placed in the first mixed solution at a bath ratio of 1:20, stirred and heated to 70-85°C, and the fabric is taken out after being kept warm for 10 minutes and washed with clean water.

[0069] In the second step, hydrogen peroxide, a scouring agent, and sodium carbonate are added to deionized water and mixed to obtain a second mixed solution, wherein the concentration of hydrogen peroxide is 10 g / L, the concentration of the scouring agent is 4 g / L, and the concentration of sodium carbonate is 5 g / L. The fabric treated in the first step is placed in the second mixed solution at a bath ratio of 1:20, stirred and heated to 95°C, and the fabric is taken out after keeping the temperature for 60 minutes and washed with clean water.

[0070] In the third step, the soap powder is dissolved in deionized water to obtain a third mixed solution. In the obtained second mixed solution, the concentration of the soap powder is 0.4 g / L. The fabric treated in the second step is placed in the third mixed solution at a bath ratio of 1:20, stirred and heated to 55°C, and the fabric is taken out after keeping warm for 10 minutes, washed with clean water, and dried.

[0071] Comparative Example 4

[0072] This comparative example uses the traditional oxygen bleaching process + bleaching process to treat the fabric, and the specific steps are as follows:

[0073] In the first step, soap powder, soda ash and deionized water are mixed to obtain a mixed solution A. In the mixed solution A, the concentration of soap powder is 3g / L and the concentration of soda ash is 2g / L. According to the bath ratio of 1:20, the fabric is placed in the mixed solution A, stirred and heated to 70-85°C, kept warm for 10 minutes, then the fabric is taken out and washed with clean water.

[0074] In the second step, hydrogen peroxide, scouring agent and sodium carbonate are added to deionized water and mixed to obtain mixed solution B. In mixed solution B, the concentration of hydrogen peroxide is 10g / L, the concentration of scouring agent is 4g / L, and the concentration of sodium carbonate is 5g / L. According to the bath ratio of 1:20, the fabric treated in the first step is placed in mixed solution B, fully stirred and heated to 95°C, and the fabric is taken out after keeping warm for 60 minutes and washed with clean water.

[0075] In the third step, the hydrosulfite and sodium carbonate are mixed in deionized water to obtain a C mixed solution, in which the concentration of the hydrosulfite is 10g / L and the concentration of the sodium carbonate is 6g / L. The fabric treated in the second step is placed in the C mixed solution at a bath ratio of 1:20, fully stirred and heated to 95°C, and the fabric is taken out after keeping warm for 60 minutes and washed with clean water.

[0076] Step 4: Dissolve soap powder in deionized water to obtain mixed solution D, in which the concentration of soap powder is 0.4 g / L. Place the fabric treated in step 3 into the mixed solution D at a bath ratio of 1:20, stir and heat to 55°C, keep warm for 10 minutes, take out the fabric, wash with clean water, and dry.

[0077] The fabrics treated in Examples 1-11 and Comparative Examples 1-4 were tested for whiteness, bursting strength, and light fastness, and the test results are shown in Table 1. In the present application, the higher the percentage of whiteness, the better the whiteness of the fabric after treatment, the greater the bursting strength, and the higher the sunlight fastness grade, indicating that the strength of the fabric fiber is higher and it is less likely to be worn. Among them: the test standard for bursting strength is measured with reference to the standard GB / T 19976-2005 "Determination of bursting strength of textiles by steel ball method". The test standard for whiteness test is based on the standard GB / T 8424.2-2001, and the whiteness of the sample is measured using the WSB-2 whiteness meter. The test standard for light fastness test is based on the standard GB / T 8427-2008 "Textiles - Tests for color fastness - Color fastness to artificial light: Xenon arc" to measure color fastness to sunlight.

[0078] Table 1: Performance data of fabrics prepared by Examples 1-9 and Comparative Examples 1-4

[0079]

[0080] From the analysis of Table 1, we can see that:

[0081] By comparing and analyzing Examples 1-9 and Comparative Examples 3-4, the technical solution of the present application uses hydrogen peroxide in a weak acid environment regulated by citric acid to generate a highly efficient peroxy acid bleach, which, with the aid of the chelating effect of citric acid, significantly enhances the bleaching efficiency of the fabric. In addition, it is also observed that the whiteness of the fabric is slightly improved with the increase of the citric acid concentration.

[0082] By comparing and analyzing Examples 1-3 and Comparative Examples 1-4, the present technical solution innovatively combines the two major components of sericin and chitosan. Sericin, with its excellent film-forming properties, biocompatibility and air permeability, synergizes with chitosan obtained by deacetylation of chitin, significantly improving biocompatibility. At the molecular level, the two are intertwined through a precise hydrogen bond network and electrostatic attraction to form a tight and stable membrane structure, or directly adhere to the fiber surface in the form of membrane fragments, providing a natural protective layer for the fiber. This innovative combination not only effectively protects the fiber from free radicals, but also significantly enhances the toughness of the fabric, and effectively resists the fading of yellow pigment caused by sunlight, showing an excellent protective effect.

[0083] By comparing and analyzing Examples 1-3 and Examples 4-6, based on the innovative fusion of sericin and chitosan, this solution further introduces polyvinyl methyl ether. This ingredient, with its excellent thickening and stabilizing performance, effectively fills the molecular gap, significantly enhances the density and mechanical strength of the membrane, and makes the structure more solid and uniform. At the same time, polyvinyl methyl ether exhibits unique chemical regulation capabilities, and improves its penetration efficiency in the system by slowing down the decomposition of hydrogen peroxide. This innovative combination not only protects the fiber from free radical damage, but also effectively prevents fiber dissolution, significantly enhancing the physical and chemical stability of the fiber.

[0084] By comparing and analyzing Examples 4-6 and Examples 7-9, the present application also adds a light whitening process, using a specific concentration of fluorescent whitening agent and sodium sulfate to treat the fabric, achieving an efficient light whitening effect on the soybean fiber-containing fabric. The fluorescent whitening agent improves the whiteness of the fabric, and the sodium sulfate promotes dye penetration and enhances the whitening effect. The optimized treatment temperature and time ensure uniform whitening of the fabric while maintaining fabric performance, providing an efficient and gentle whitening process for soybean fiber-containing fabrics, further reducing the sensitivity of soybean fiber-containing fabrics to sunlight fading.

[0085] By comparing and analyzing Example 4 and Example 10, as well as Example 7 and Example 11, the soybean fiber-containing fabric treated by the technical solution of the present application does not destroy the strength of the fabric fibers during the dyeing process, and still has excellent sunlight fastness after dyeing.

[0086] Although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0087] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present application. They are not intended to limit the scope of protection of the present application. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present application should be included in the scope of protection of the present application.

Claims

1. A method for improving the whiteness of fabric containing soybean fiber, characterized in that: The following steps are involved: S1. Mix soap powder, soda ash and deionized water, stir thoroughly and heat to 70°C to 85°C to obtain a first treatment solution, add the fabric to the first treatment solution, keep it at 70°C to 85°C for 5min to 15min, then take out the fabric and wash it with clean water; S2, mixing the fabric treated in step S1 with deionized water at a bath ratio of 1:20, adjusting the pH of the deionized water to 6-7 with glacial acetic acid, adding hydrogen peroxide, a refining agent, and citric acid, mixing thoroughly, and heating to 45°C-60°C to obtain a second treatment solution, and keeping the fabric in the second treatment solution for 15-30 minutes; in the second treatment solution, the concentration of hydrogen peroxide is 5g / L-8g / L, the concentration of the refining agent is 3g / L-5g / L, and the concentration of citric acid is 3g / L-5g / L; S3, adding hydrogen peroxide, sericin and chitosan to the second treatment liquid of step S2, stirring and mixing, heating to 75°C to 90°C to obtain a third treatment liquid, keeping the fabric in the third treatment liquid for 30min to 40min, then taking out the fabric and washing it with clean water; in the third treatment liquid, the concentration of hydrogen peroxide is 8g / L to 12g / L, the concentration of sericin is 2g / L to 5g / L, and the concentration of chitosan is 1g / L to 3g / L; S4, fully mix the soap powder and deionized water to obtain a fourth treatment liquid with a soap powder concentration of 0.2g / L to 0.5g / L, heat the fourth treatment liquid to 50°C to 60°C, add the fabric treated in step S3 to the fourth treatment liquid, and keep it at 50°C to 60°C for 5min to 15min, then take out the fabric, wash it with clean water, and dry it.

2. The method for improving the whiteness of fabric containing soybean fiber according to claim 1, characterized in that: In step S1, in the first treatment liquid, the concentration of the soap powder is 2g / L to 5g / L, the concentration of the soda ash is 1g / L to 3g / L, and the bath ratio of the fabric to the first treatment liquid is 1:

20.

3. The method for improving the whiteness of fabric containing soybean fiber according to claim 1, characterized in that: Step S3 further includes the step of continuously adding polyvinyl methyl ether to the third treatment liquid.

4. The method for improving the whiteness of fabric containing soybean fiber according to claim 3, characterized in that: In the third treatment liquid, the concentration of the polyvinyl methyl ether is 2 g / L to 4 g / L.

5. The method for improving the whiteness of fabric containing soybean fiber according to claim 1, characterized in that: After step S3 and before step S4, the method further includes step S5, mixing the fluorescent whitening agent, sodium sulphate and deionized water, stirring them fully and heating them to 60° C. to 75° C. to obtain a fifth treatment liquid, adding the fabric to the fifth treatment liquid, and keeping it at 60° C. to 75° C. for 5 min to 15 min, then taking out the fabric and washing it with clean water.

6. The method for improving the whiteness of fabric containing soybean fiber according to claim 5, characterized in that: In the fifth treatment liquid, the concentration of the fluorescent whitening agent is 0.3 g / L to 0.5 g / L, the concentration of the sodium sulfate is 0.8 g / L to 1 g / L, and the bath ratio of the fabric to the fifth treatment liquid is 1:

20.

7. The method for improving the whiteness of fabric containing soybean fiber according to claim 5, characterized in that: The fluorescent whitening agent is at least one of 4BK, ER-I, ER-II, BA, CXT, MST, BAC, SWN / AW, WGS, and NFW.

8. The method for improving the whiteness of fabric containing soybean fiber according to claim 1, characterized in that: The hydrogen peroxide is industrial-grade hydrogen peroxide, the concentration of the industrial-grade hydrogen peroxide is 25 g / L to 35 g / L, and the sericin is sericin powder.

Images