Washing methods for cotton after debleaching

Abstract

This invention provides a washing method for debleached cotton. First, a soaping agent is dissolved in water, then an alcoholic organic solvent is added and stirred until homogeneous to obtain a soaping solution. The soaping agent is a mixture of fatty alcohol polyoxyethylene ether (EO9), fatty amine polyoxyethylene ether (EO15), isooctyl alcohol polyoxyethylene ether (EO5), ethanol, and deionized water. Next, a debleached cotton sample is placed in the prepared soaping solution and soaped at a preset temperature. Following this, the sample undergoes hot water washing, cold water washing, and drying to obtain the soaped finished product. The various substances in the soaping agent used in this invention can bond with each other, and their molecular chains are cross-linked and entangled. The large amount of ethanol in the soaping solution can further bond with this network structure. Under the synergistic effect of various substances, impurities on the cotton products are encapsulated and removed, improving the whiteness of the cotton products while cleaning them.

Description

Technical Field

[0001] This invention relates to the field of soap washing technology, and more particularly to a method for washing cotton after debleaching. Background Technology

[0002] Cotton fiber, as an important component of natural fibers, is widely favored for its unique comfort, breathability, and softness. However, impurities in cotton fibers, such as pectin, cottonseed hulls, oils, waxes, nitrogenous substances, and pigments, can affect the properties of cotton fibers or cotton products, necessitating debleaching treatment. However, debleached fibers or products still retain residues of the debleaching solution and some re-adhered oils, requiring further soaping to remove these residues and impurities, resulting in a pure white appearance and good wetting and permeability.

[0003] The commonly used soaping treatment method involves placing soap flakes and sodium carbonate in a mixture of alcoholic organic solvent and water, stirring to form a washing solution, and then washing at a relatively high temperature (e.g., patent application number CN201410537783.7). This method has a relatively high soaping temperature and can only achieve a limited degree of whiteness.

[0004] In view of this, it is necessary to design an improved washing method for debleached cotton to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a washing method for cotton after debleaching. The soaping agent is composed of fatty alcohol polyoxyethylene ether (EO9), fatty amine polyoxyethylene ether (EO15), isooctyl alcohol polyoxyethylene ether (EO5), ethanol and deionized water mixed in a specific ratio. The various substances in the soaping agent can bond with each other and the molecular chains can cross-link and entangle. The large amount of ethanol in the soaping solution can further bond with the network structure. Under the synergistic effect of various substances, impurities on cotton products are wrapped and removed, and the whiteness of cotton samples is improved while cleaning the cotton samples.

[0006] To achieve the above-mentioned objective, the present invention provides a washing method for cotton after debleaching, comprising the following steps:

[0007] S1. Dissolve the soaping agent in water, then add an alcoholic organic solvent, and stir until homogeneous to obtain a soaping solution; the soaping agent is a mixture of fatty alcohol polyoxyethylene ether (EO9), fatty amine polyoxyethylene ether (EO15), isooctyl alcohol polyoxyethylene ether (EO5), ethanol and deionized water.

[0008] S2. Place the debleached cotton sample into the soaping solution prepared in step S1, soap it at a preset temperature, and then wash it with hot water, cold water, and dry it to obtain the soaped finished product.

[0009] As a further improvement of the present invention, in step S1, the mass fraction of the fatty alcohol polyoxyethylene ether (EO9) in the soaping agent is 20%-30%, the mass fraction of the fatty amine polyoxyethylene ether (EO15) is 5%-10%, the mass fraction of the isooctyl alcohol polyoxyethylene ether (EO5) is 5%-10%, the mass fraction of the ethanol is 1%-5%, and the remainder is deionized water.

[0010] As a further improvement of the present invention, in step S1, the mass concentration of the soaping agent in the soaping solution is 0.1g / L-2.0g / L.

[0011] As a further improvement of the present invention, in step S1, the volume ratio of the alcohol organic solvent to water is 80:20-50:50.

[0012] As a further improvement of the present invention, the alcoholic organic solvent is one of ethanol and isopropanol.

[0013] As a further improvement of the present invention, in step S2, the preset temperature of the soap washing is 60-80℃, the temperature of the hot water washing is 60-80℃, and the cold water washing is room temperature water washing.

[0014] As a further improvement of the present invention, the soap washing time is 5-20 minutes, the hot water washing time is 5-10 minutes, and the cold water washing time is 3-6 minutes.

[0015] As a further improvement of the present invention, in step S2, the cotton sample is one of cotton nonwoven fabric or cotton fabric.

[0016] As a further improvement of the present invention, the debleaching process of the cotton sample is one of high-temperature boiling and bleaching or cold padding.

[0017] As a further improvement of the present invention, the whiteness of the finished product after soaping is as high as 93.56, and the water absorption time is as low as 1.23s.

[0018] The beneficial effects of this invention are:

[0019] (1) This invention provides a washing method for cotton after debleaching. The soaping agent is composed of fatty alcohol polyoxyethylene ether (EO9), fatty amine polyoxyethylene ether (EO15), isooctyl alcohol polyoxyethylene ether (EO5), ethanol, and deionized water in a specific ratio. During soaping, the molecular chains of long-chain fatty alcohol polyoxyethylene ether (EO9) and fatty amine polyoxyethylene ether (EO15), as well as short-chain isooctyl alcohol polyoxyethylene ether (EO5), are preferably cross-linked and entangled to varying degrees. The ether groups, hydroxyl groups, and amino groups are bonded to each other through hydrogen bonds to form a stable network structure. At the same time, a large amount of ethanol in the soaping solution can further bond with this network structure. Under the synergistic effect of highly permeable ethanol and isooctyl alcohol polyoxyethylene ether (EO5), the network structure formed by the various substances in the soaping solution quickly penetrates the cotton product and enters the interior of the cotton product. Under the synergistic effect of various substances, impurities on the cotton product are wrapped and removed, and the whiteness of the cotton product is improved while cleaning it.

[0020] (2) The present invention uses a mixed solution of ethanol and water, which can save water usage. The ethanol can be recycled and reused after washing, effectively saving water consumption during the washing process. At the same time, the soaping temperature is greatly reduced from the traditional soaping temperature of 80-90℃ to 60℃, saving energy. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to specific embodiments.

[0022] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] This invention provides a method for washing cotton after debleaching, comprising the following steps:

[0024] S1. Preparation of soap solution:

[0025] Dissolve the soaping agent in water, then add an alcoholic organic solvent and stir until homogeneous to obtain a soaping solution. The volume ratio of the alcoholic organic solvent to water is 80:20-50:50. The alcoholic organic solvent is either ethanol or isopropanol, preferably ethanol.

[0026] The soaping agent is a mixture of fatty alcohol polyoxyethylene ether (EO9), fatty amine polyoxyethylene ether (EO15), isooctyl alcohol polyoxyethylene ether (EO5), ethanol, and deionized water. The mass fraction of fatty alcohol polyoxyethylene ether (EO9) in the soaping agent is 20%-30%, fatty amine polyoxyethylene ether (EO15) is 5%-10%, isooctyl alcohol polyoxyethylene ether (EO5) is 5%-10%, ethanol is 1%-5%, and the remainder is deionized water. Fatty alcohol polyoxyethylene ether (EO9) exhibits good stability in both acidic and alkaline environments and good washing performance at low temperatures. Fatty amine polyoxyethylene ether (EO15) has excellent hydrophilicity and good affinity for cotton fibers, also exhibiting good washing performance at low temperatures. Isooctyl alcohol polyoxyethylene ether (EO5) has good penetrating properties and can work synergistically with ethanol to quickly penetrate the interior of cotton fibers, removing impurities such as waxes or cottonseed hulls.

[0027] In the soaping solution, the mass concentration of the soaping agent is 0.1 g / L-2.0 g / L.

[0028] S2. Soap washing:

[0029] The bleached cotton sample is placed in the soaping solution prepared in step S1 and soaped at a preset temperature of 60-80℃ for 5-20 minutes. Then, it is washed in hot water at 60-80℃ for 5-10 minutes and in cold water at room temperature for 3-6 minutes (i.e., room temperature water washing). After drying, the soaped finished product is obtained.

[0030] Specifically, the cotton sample is either cotton nonwoven fabric or cotton woven fabric. The cotton sample's debleaching process is either high-temperature scouring or cold pad-batch processing.

[0031] During this process, the long-chain fatty alcohol polyoxyethylene ether (EO9) and short-chain isooctanol polyoxyethylene ether (EO5) molecules in the soaping agent contain ether groups and hydroxyl groups, while the fatty amine polyoxyethylene ether (EO15) molecules contain ether groups and amino groups. Different degrees of cross-linking and entanglement occur between the long-chain fatty alcohol polyoxyethylene ether (EO9), fatty amine polyoxyethylene ether (EO15), and short-chain isooctanol polyoxyethylene ether (EO5) molecules. Furthermore, the ether groups, hydroxyl groups, and amino groups are bonded to each other through hydrogen bonds, forming… A stable network structure is formed; simultaneously, the abundant ethanol in the soaping solution further bonds with this network structure. Under the synergistic effect of highly permeable ethanol and isooctanol polyoxyethylene ether (EO5), the network structure formed by various substances in the soaping solution quickly penetrates the cotton products and enters their interior, encapsulating and removing impurities. Furthermore, the network structure formed by the various substances in the soaping agent can further promote the bleaching of the cotton sample by the effective components in the bleaching solution, thus improving the whiteness of the cotton products while cleaning them. The whiteness of the finished product after soaping reaches 93.56, and the water absorption time is as low as 1.23 seconds.

[0032] The present invention will now be described in detail through specific embodiments.

[0033] Example 1

[0034] A method for washing cotton after bleaching includes the following steps:

[0035] S1. Preparation of soap solution:

[0036] Dissolve 0.2g of soaping agent in 200mL of water, stir well, then pour in 800mL of ethanol and stir well to obtain a soaping solution with a concentration of 0.2g / L. Pour the soaping solution into a beaker.

[0037] The soaping agent is a mixture of fatty alcohol polyoxyethylene ether (EO9), fatty amine polyoxyethylene ether (EO15), isooctanol polyoxyethylene ether (EO5), ethanol, and deionized water. The soaping agent contains 30% fatty alcohol polyoxyethylene ether (EO9) by mass, 10% fatty amine polyoxyethylene ether (EO15) by mass, 10% isooctanol polyoxyethylene ether (EO5) by mass, 1% ethanol by mass, and the remainder is deionized water.

[0038] S2. Soap washing:

[0039] Prepare the finishing solution, immerse 5g of cotton fabric in the solution, pad it, and then pile it for 24 hours for cold pad-batch boiling and bleaching. The finishing solution contains 40g / L sodium hydroxide, 60g / L hydrogen peroxide, and 24g / L refining agent.

[0040] The bleached cotton fabric is placed in the soaping solution prepared in step S1, and soaped at a preset temperature of 70°C for 20 minutes. Then, it is washed in hot water at 70°C for 10 minutes and in cold water at room temperature for 5 minutes (i.e., room temperature water washing). After drying, the soaped finished product is obtained.

[0041] Examples 2-3 and Comparative Examples 1-2

[0042] A washing method for debleached cotton differs from Example 1 in that the mass fraction of fatty alcohol polyoxyethylene ether (EO9) in the soaping agent is different in step S1. The other steps are largely the same as in Example 1 and will not be repeated here.

[0043] The cotton products obtained in Examples 1-3 and Comparative Examples 1-2 were subjected to performance tests, and the results are shown in Table 1.

[0044] Whiteness was determined according to standard GB / T 8424.2-2001 "Instrumental Evaluation Method for Relative Whiteness in Color Fastness Tests of Textiles".

[0045] Table 1. Relevant properties of cotton products obtained in Examples 1-3 and Comparative Examples 1-2

[0046] Example Fatty alcohol polyoxyethylene ether (EO9) (%) Whiteness (%) Water absorption time (s) Example 1 30 93.56 1.23 Example 2 25 93.45 1.89 Example 3 20 93.13 1.76 Comparative Example 1 35 93.51 1.94 Comparative Example 2 15 92.68 2.56

[0047] As shown in Table 1, with the increase of the mass fraction of fatty alcohol polyoxyethylene ether (EO9) in the detergent, the whiteness of the samples first increased and then decreased, while the water absorption time first decreased and then increased. This may be because the network structure of the various substances in the detergent changes with the change of the mass fraction of fatty alcohol polyoxyethylene ether (EO9), further affecting the binding with ethanol, thus affecting its ability to wet cotton fabrics and remove impurities. It also affects the surface structure and hydroxyl distribution of the cotton fabric after impurity removal, ultimately affecting the whiteness and water absorption time of the fabric. The cotton fabric exhibits the best performance when the mass fraction of fatty alcohol polyoxyethylene ether (EO9) is 30%.

[0048] Example 4 and Comparative Examples 3-4

[0049] A washing method for debleached cotton differs from Example 1 in that the mass fraction of fatty amine polyoxyethylene ether (EO15) in the soaping agent is different in step S1. Otherwise, it is largely the same as Example 1 and will not be described again here.

[0050] The cotton products obtained in Example 4 and Comparative Examples 3-4 were subjected to performance tests, and the results are shown in Table 2:

[0051] Whiteness was determined according to standard GB / T 8424.2-2001 "Instrumental Evaluation Method for Relative Whiteness in Color Fastness Tests of Textiles".

[0052] Table 2. Relevant properties of the cotton products obtained in Example 4 and Comparative Examples 3-4

[0053]

[0054]

[0055] As shown in Table 2, when the content of fatty amine polyoxyethylene ether (EO15) is low, the whiteness and water absorption of the sample are obviously poor. As the content of fatty amine polyoxyethylene ether (EO15) increases, the whiteness and water absorption of the sample are improved. When the content of fatty amine polyoxyethylene ether (EO15) is too high, the water absorption of the sample further decreases, indicating that fatty amine polyoxyethylene ether (EO15) is indispensable in the low-temperature soaping process.

[0056] Example 5 and Comparative Examples 5-6

[0057] A washing method for debleached cotton differs from Example 1 in that the mass fraction of isooctanol polyoxyethylene ether (EO5) in the soaping agent is different in step S1. The other steps are largely the same as in Example 1 and will not be repeated here.

[0058] The cotton products obtained in Example 5 and Comparative Examples 5-6 were subjected to performance tests, and the results are shown in Table 3.

[0059] Whiteness was determined according to standard GB / T 8424.2-2001 "Instrumental Evaluation Method for Relative Whiteness in Color Fastness Tests of Textiles".

[0060] Table 3. Relevant properties of the cotton products obtained in Example 5 and Comparative Examples 5-6

[0061] Example Isooctyl alcohol polyoxyethylene ether (EO5) (%) Whiteness (%) Water absorption time (s) Example 1 10 93.56 1.23 Example 5 5 92.32 2.38 Comparative Example 5 15 93.55 1.26 Comparative Example 6 1 88.24 8.36

[0062] As shown in Table 3, with the increase of isooctanol polyoxyethylene ether (EO5), the whiteness of the samples first increased and then tended to stabilize, while the water absorption time first decreased and then tended to stabilize. This may be because, on the one hand, the change in the mass fraction of isooctanol polyoxyethylene ether (EO5) affects the network structure of the various substances in the soaping agent, thus affecting the binding with impurities; on the other hand, the change in the mass fraction of isooctanol polyoxyethylene ether (EO5) affects its synergistic effect with ethanol, thereby affecting the contact between the soaping agent and the cotton fabric and the process of diffusion into the interior. These two factors result in deviations in the whiteness and water absorption time of the fabric.

[0063] Examples 6-8 and Comparative Example 7

[0064] A washing method for debleached cotton, which differs from Example 1 in that the concentration of soaping agent in the soaping solution is different in step S1, but otherwise it is roughly the same as Example 1 and will not be described again here.

[0065] The cotton products obtained in Examples 6-8 and Comparative Example 7 were subjected to performance tests, and the results are shown in Table 4.

[0066] Whiteness was determined according to standard GB / T 8424.2-2001 "Instrumental Evaluation Method for Relative Whiteness in Color Fastness Tests of Textiles".

[0067] Table 4 shows the relevant properties of the cotton products obtained in Examples 6-8 and Comparative Example 7.

[0068] Example Concentration of soap detergent (g / L) Whiteness (%) Water absorption time (s) Example 1 0.2 93.56 1.23 Example 6 0.1 93.26 1.84 Example 7 1.0 93.46 1.99 Example 8 2.0 93.52 2.24 Comparative Example 7 2.5 92.69 2.66

[0069] Table 4 shows that when the concentration of the soaping agent varies within a certain range, it has little effect on the whiteness of the samples, but the change in water absorption time is more significant. When the concentration of the soaping agent is too high, it not only fails to improve the whiteness, but also significantly reduces the water absorption.

[0070] Examples 9-11 and Comparative Examples 8-9

[0071] A washing method for debleached cotton differs from Example 1 in that the volume ratio of ethanol to water is different in step S1. Otherwise, it is largely the same as Example 1 and will not be described again here.

[0072] The cotton products obtained in Examples 9-11 and Comparative Examples 8-9 were subjected to performance tests, and the results are shown in Table 5.

[0073] Whiteness was determined according to standard GB / T 8424.2-2001 "Instrumental Evaluation Method for Relative Whiteness in Color Fastness Tests of Textiles".

[0074] Table 5. Relevant properties of the cotton products obtained in Examples 9-11 and Comparative Examples 8-9.

[0075]

[0076]

[0077] As shown in Table 5, the ratio of ethanol has a certain impact on whiteness and water absorption. When the ratio of ethanol to water is 80:20, the sample performance is the best. Appropriate ethanol can work with soap to remove impurities from the sample. Too much or too little ethanol will weaken the washing effect of the sample.

[0078] Examples 12-13 and Comparative Examples 10-11

[0079] A method for washing cotton after debleaching differs from Example 1 in that the temperature of soaping in step S2 is different, while the rest is largely the same as in Example 1 and will not be described again here.

[0080] The cotton products obtained in Examples 12-13 and Comparative Examples 10-11 were subjected to performance tests, and the results are shown in Table 6.

[0081] Whiteness was determined according to standard GB / T 8424.2-2001 "Instrumental Evaluation Method for Relative Whiteness in Color Fastness Tests of Textiles".

[0082] Table 6. Relevant properties of the cotton products obtained in Examples 12-13 and Comparative Examples 10-11.

[0083] Example Temperature (°C) Whiteness (%) Water absorption time (s) Example 1 70 93.56 1.23 Example 12 60 93.42 1.89 Example 13 80 93.53 1.42 Comparative Example 10 50 89.67 8.51 Comparative Example 11 90 93.52 1.39

[0084] Table 6 shows that when the soaping temperature is reduced to 60℃, both the whiteness and water absorption time of the samples reach relatively ideal values. However, at 50℃, the temperature cannot provide sufficient heat for the soaping process, leading to slower molecular chain movement and a weakened soaping effect. At 90℃, although the whiteness is good, the water absorption is relatively poor, indicating that excessively high temperatures can also affect the surface structure of the cotton after washing, thus affecting its water absorption.

[0085] Comparative Example 12

[0086] A washing method for debleached cotton differs from Example 1 in that the soaping agent in step S1 does not contain fatty alcohol polyoxyethylene ether (EO9). The other steps are largely the same as in Example 1 and will not be repeated here.

[0087] Comparative Example 13

[0088] A washing method for debleached cotton differs from Example 1 in that the soaping agent in step S1 does not contain fatty amine polyoxyethylene ether (EO15). The other steps are largely the same as in Example 1 and will not be repeated here.

[0089] Comparative Example 14

[0090] A washing method for debleached cotton, which differs from Example 1 in that the soaping agent in step S1 does not contain isooctyl alcohol polyoxyethylene ether (EO5), while the other steps are largely the same as in Example 1 and will not be repeated here.

[0091] Comparative Example 15

[0092] A washing method for debleached cotton, which differs from Example 1 in that, in step S1, isooctyl alcohol polyoxyethylene ether (EO5) in the soaping agent is replaced with isodecyl alcohol polyoxyethylene ether (EO5). The rest is roughly the same as in Example 1, and will not be repeated here.

[0093] Comparative Example 16

[0094] A washing method for debleached cotton, which differs from Example 1 in that, in step S1, isooctyl alcohol polyoxyethylene ether (EO5) in the soaping agent is replaced with secondary alcohol polyoxyethylene ether (EO9). The rest is roughly the same as in Example 1 and will not be described again here.

[0095] Comparative Example 17

[0096] A washing method for debleached cotton, compared with Example 1, differs in that, in step S1, the mass fraction of fatty alcohol polyoxyethylene ether (EO9) in the soaping agent is 15%, the mass fraction of fatty amine polyoxyethylene ether (EO15) is 15%, the mass fraction of isooctanol polyoxyethylene ether (EO5) is 10%, the mass fraction of ethanol is 5%, and the remainder is deionized water. The rest is roughly the same as in Example 1, and will not be repeated here.

[0097] Comparative Example 18

[0098] A washing method for bleached cotton, compared with Example 1, differs in that the composition and content of each substance in the soaping agent are different in step S1. Specifically, the soaping agent contains 15% fatty alcohol polyoxyethylene ether (EO9) by mass, 15% fatty amine polyoxyethylene ether (EO15) by mass, 8% isomeric decaol polyoxyethylene ether (EO5) by mass, 10% secondary alcohol polyoxyethylene ether (EO9) by mass, 5% ethanol by mass, and 47% deionized water by mass. Other aspects are largely the same as in Example 1 and will not be repeated here.

[0099] Comparative Example 19

[0100] A washing method for debleached cotton, which differs from Example 1 in that the soaping agent in step S1 is pure deionized water, while the other steps are largely the same as in Example 1 and will not be repeated here.

[0101] Comparative Example 20

[0102] A washing method for debleached cotton, which differs from Example 1 in that, in step S1, the soaping agent is a mixed solution of deionized water and sodium carbonate, while the rest is largely the same as in Example 1 and will not be repeated here.

[0103] The cotton products obtained in Comparative Examples 12-20 were subjected to performance tests, and the results are shown in Table 7.

[0104] Whiteness was determined according to standard GB / T 8424.2-2001 "Instrumental Evaluation Method for Relative Whiteness in Color Fastness Tests of Textiles".

[0105] Table 7 shows the relevant properties of the cotton products obtained from Comparative Examples 12-20.

[0106] Example Whiteness (%) Water absorption time (s) Comparative Example 12 85.24 39.58 Comparative Example 13 84.66 36.59 Comparative Example 14 87.68 27.57 Comparative Example 15 84.81 45.33 Comparative Example 16 85.34 42.96 Comparative Example 17 92.62 2.47 Comparative Example 18 85.39 39.19 Comparative Example 19 85.53 43.06 Comparative Example 20 86.76 39.33

[0107] As shown in Table 7, based on the data from Comparative Examples 12-14, when the soap detergent does not contain any of the three components, its whiteness and water absorption are significantly worse. This indicates that the interbonded structure of the three components in the soap detergent is more effective in removing impurities.

[0108] Data from Comparative Examples 15-16 show that replacing isooctanol polyoxyethylene ether (EO5) with a structurally different alcohol polyoxyethylene ether significantly reduces whiteness and water absorption. This further demonstrates that a synergistic effect is required between fatty alcohol polyoxyethylene ether (EO9), fatty amine polyoxyethylene ether (EO15), and isooctanol polyoxyethylene ether (EO5) to achieve excellent results.

[0109] As can be seen from the data of Comparative Example 17, when the ratio of fatty alcohol polyoxyethylene ether (EO9), fatty amine polyoxyethylene ether (EO15), and isooctyl alcohol polyoxyethylene ether (EO5) changes, it will also have a significant impact on whiteness and water absorption.

[0110] The data from Comparative Example 20 show that using traditional sodium carbonate for soap washing results in lower whiteness and significantly poorer water absorption.

[0111] In summary, this invention provides a washing method for cotton after debleaching. The soaping agent is composed of fatty alcohol polyoxyethylene ether (EO9), fatty amine polyoxyethylene ether (EO15), isooctyl alcohol polyoxyethylene ether (EO5), ethanol, and deionized water mixed in a specific ratio. The various substances in the soaping agent can bond with each other, and their molecular chains cross-link and entangle. The large amount of ethanol in the soaping solution can further bond with this network structure. Under the synergistic effect of various substances, impurities on the cotton products are encapsulated and removed, improving the whiteness of the cotton products while cleaning them. Using a mixture of ethanol and water saves water, and the ethanol can be recycled and reused after washing, effectively conserving water during the washing process. Simultaneously, the soaping temperature is significantly reduced from the traditional 80-90℃ to 60℃, saving energy.

[0112] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for washing cotton after debleaching, characterized in that, Includes the following steps: S1. Dissolve the soaping agent in water, then add an alcoholic organic solvent, and stir until homogeneous to obtain a soaping solution; the soaping agent is a mixture of fatty alcohol polyoxyethylene ether EO9, fatty amine polyoxyethylene ether EO15, isooctyl alcohol polyoxyethylene ether EO5, ethanol and deionized water. S2. Place the debleached cotton sample into the soaping solution prepared in step S1, soap it at a preset temperature, and then wash it with hot water, cold water, and dry it to obtain the soaped finished product. In step S1, the soaping agent contains 20%-30% fatty alcohol polyoxyethylene ether EO9, 5%-10% fatty amine polyoxyethylene ether EO15, 5%-10% isooctyl alcohol polyoxyethylene ether EO5, 1%-5% ethanol, and the remainder is deionized water. In step S1, the concentration of the soaping agent in the soaping solution is 0.1 g / L-2.0 g / L; In step S1, the volume ratio of the alcohol organic solvent to water is 80:20-50:

50.

2. The washing method for debleached cotton according to claim 1, characterized in that, The alcoholic organic solvent is one of ethanol and isopropanol.

3. The washing method for debleached cotton according to claim 1, characterized in that, In step S2, the preset temperature for soap washing is 60-80℃, the temperature for hot water washing is 60-80℃, and the temperature for cold water washing is room temperature water washing.

4. The washing method for debleached cotton according to claim 3, characterized in that, The soap washing time is 5-20 minutes, the hot water washing time is 5-10 minutes, and the cold water washing time is 3-6 minutes.

5. The washing method for debleached cotton according to claim 1, characterized in that, In step S2, the cotton sample is either cotton nonwoven fabric or cotton woven fabric.

6. The washing method for debleached cotton according to claim 1, characterized in that, The cotton sample was debleached using one of the following methods: high-temperature boiling and cold padding.

7. The washing method for debleached cotton according to claim 1, characterized in that, The finished product after soap washing has a whiteness of up to 93.56 and a water absorption time as low as 1.23s.

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