Penetrating agent for pretreatment of cotton fabric

Abstract

The invention discloses a penetrant for pretreatment of cotton fabrics, and belongs to the technical field of textiles. The invention provides a penetrating agent for a short-process pretreatment process of cotton fabrics. The penetrating agent contains an amino acid anionic surfactant with a structure as shown in a formula (I). The penetrating agent, sodium hydroxide and hydrogen peroxide construct a working solution, the working solution can be used for carrying out desizing, scouring and bleaching one-bath pretreatment on the cotton woven fabric, the capillary effect of the treated cotton woven fabric is 15.2 cm / 30 min, the whiteness is 85% or above, the desizing rate can reach up to 13.9%, and the cotton fabric is good in hand feeling. The penetrant is wide in raw material source and small in irritation, has the characteristics of high permeability and strong alkali resistance, can achieve the effects of saving energy, reducing emission and improving efficiency in the actual production process, and also conforms to the concept of green economy. # imgabs0 #

Description

Technical Field

[0001] The invention belongs to the technical field of textiles, and particularly relates to a penetrant for pre-treatment of cotton fabrics. Background Art

[0002] Natural fibers contain a large amount of impurities, and various oils and contaminated dirt are added during textile processing. The presence of these impurities not only hinders the dyeing and finishing process, but also affects the wearability of the fabric. Textile pretreatment is one of the important processes in textile dyeing and finishing. Traditional cotton woven fabric pretreatment is completed in three processes, namely desizing, scouring and bleaching. This process takes a relatively long time, consumes a lot of water, electricity and gas, and also consumes a lot of chemicals (mainly sodium hydroxide), resulting in a relatively high COD value of industrial wastewater, which is difficult to handle. In the entire cotton fabric dyeing and finishing process, the water and electricity resources consumed in the pretreatment process account for about 70% of the total consumption. Therefore, the development of energy-saving and emission-reduction processes for cotton fabric pretreatment is in line with the development trend of the entire dyeing and finishing industry. At present, it has been gradually replaced by the cotton fabric desizing, boiling and bleaching one-bath pretreatment process. This process method is simple to use and reduces energy consumption, but the grey cloth still contains a large number of impurities that have not been removed. Therefore, an appropriate amount of penetrant is added to the desizing, boiling and bleaching one-bath process to achieve a better treatment effect. Traditional penetrants show poor permeability in practical applications, and the desizing rate of the treated cotton fabrics is low. Therefore, the textile industry has higher requirements for pre-treatment penetrants, requiring the penetrants to have excellent permeability, alkali resistance, high temperature resistance, and low toxicity to operators. Summary of the invention

[0003] The purpose of the present invention is to provide a penetrant with excellent permeability, alkali resistance and high temperature resistance, which is also non-toxic and harmless to operators and easily biodegradable.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] The present invention provides a penetrant for a short-process pretreatment process of cotton fabrics, which contains an amino acid anionic surfactant having a structure shown in formula (I);

[0006]

[0007] Wherein, M is Na or K.

[0008] As a preferred embodiment of the present invention, the penetrant is an amino acid anionic surfactant having a structure shown in formula (I), or a combination of an amino acid anionic surfactant having a structure shown in formula (I) and at least one of fatty alcohol polyoxyethylene ether and sodium lauryl sulfate.

[0009] The invention also provides application of the cotton fabric pretreatment penetrant in a cotton woven fabric pretreatment process.

[0010] The present invention also provides the working solution for pre-treatment of cotton fabrics, comprising the above-mentioned penetrant, sodium hydroxide, hydrogen peroxide and deionized water.

[0011] As a preferred embodiment of the present invention, in the cotton fabric pretreatment working solution, the concentration of the penetrant is 1-5 g / L.

[0012] As a preferred embodiment of the present invention, in the cotton fabric pretreatment working solution, the concentration of sodium hydroxide is 5 to 25 g / L, preferably 10 to 15 g / L.

[0013] As a preferred embodiment of the present invention, in the cotton fabric pretreatment working solution, the concentration of hydrogen peroxide is 10 to 50 g / L, preferably 20 to 30 g / L.

[0014] As a preferred embodiment of the present invention, hydrogen peroxide is added to the cotton fabric pre-treatment working solution by adding a 30 wt % hydrogen peroxide solution.

[0015] The present invention also provides a one-bath descaling and bleaching pretreatment process for cotton fabrics, which comprises immersing the cotton grey fabric in the working solution, heating and reacting the fabric for a period of time, and then washing and drying the fabric.

[0016] As an implementation mode of the present invention, the mass ratio of the cotton grey cloth to the working liquid is 1:30.

[0017] As an embodiment of the present invention, the heating reaction temperature is 50-90° C. and the time is 20-60 min.

[0018] Beneficial effects:

[0019] The invention provides a penetrant for cotton fabric pretreatment, which not only has good permeability, but is also easily biodegradable, non-toxic and harmless to the environment and operators, and can save energy and reduce emissions and improve efficiency during the cotton fabric pretreatment process, has certain economic benefits, and is in line with the concept of green economy.

[0020] The present invention is based on the one-bath descaling, bleaching and scouring method for cotton fabrics, and based on the synergistic effect of sodium hydroxide, hydrogen peroxide and penetrant on cotton fabrics in a specific proportion, which improves the treatment effect on cotton fabrics. The wool effect of cotton fabrics obtained by this process is not less than 14cm·30min -1 The whiteness is above 85%, the desizing rate can be as high as 13.9%, and the process is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1The figure is the hydrogen nuclear magnetic spectrum of the amino acid anionic surfactant of the present invention. DETAILED DESCRIPTION

[0022] The present invention provides a penetrant for a short-process pretreatment process of cotton fabrics, comprising an amino acid anionic surfactant as shown in the following structure;

[0023] M is Na or K.

[0024] As a preferred embodiment of the present invention, the penetrant of the cotton fabric short-process pretreatment process contains 0 to 10 parts of anionic surfactant, which is not 0, and more preferably 2 to 8 parts.

[0025] The present invention also provides the application of the cotton fabric pretreatment penetrant in the cotton woven fabric pretreatment process. The cotton woven fabric is treated by preparing a working solution of the cotton fabric pretreatment penetrant with sodium hydroxide, hydrogen peroxide solution and deionized water.

[0026] As a preferred embodiment of the present invention, in the pretreatment working solution, the penetrant is the above-mentioned amino acid anionic surfactant, or a combination of the above-mentioned amino acid anionic surfactant and at least one of fatty alcohol polyoxyethylene ether and sodium lauryl sulfate.

[0027] As a preferred embodiment of the present invention, in the pretreatment working solution, the concentration of the penetrant is 1-5 g / L, preferably 3-5 g / L.

[0028] As a preferred embodiment of the present invention, in the pretreatment working solution, the concentration of sodium hydroxide is 5 to 25 g / L, preferably 10 to 25 g / L, and more preferably 10 g / L.

[0029] As a preferred embodiment of the present invention, in the pre-treatment working solution, the mass fraction of the hydrogen peroxide solution is 30%, and the concentration of the hydrogen peroxide solution is 10 to 50 g / L, preferably 20 to 40 g / L.

[0030] The technical solution provided by the present invention is further described below in conjunction with embodiments, but the scope of protection claimed by the present invention is not limited to the scope represented by the embodiments.

[0031] Example 1

[0032] Preparation of amino acid anionic surfactant:

[0033]

[0034] First, palmitic acid (hexadecanoic acid) is reacted with thionyl chloride to generate palmitoyl chloride, and the amino acid is neutralized with an equimolar mass of sodium hydroxide to generate a water-soluble amino acid salt; then, the amino acid salt is reacted with palmitoyl chloride in an alkaline environment in an excess amount to obtain an intermediate product, palmitoyl amino acid salt; finally, the intermediate product is reacted with phenylalanine under the catalytic condition of a polypeptide condensation reagent 2-(7-azabenzotriazole)-N,N,N',N'-tetramethyluronium hexafluorophosphate to generate palm oil amino acid disodium, and the final product is used as the above-mentioned amino acid anionic surfactant (C 29 H 44 N2Na2O6).

[0035] The specific experimental process is as follows:

[0036] Palmitic acid (50 mmol) was added into a three-necked flask equipped with a tail gas recovery device and a condenser reflux tube. With dichloromethane as solvent, a catalytic amount of 4-dimethylaminopyridine was added. The mixture was stirred and heated to 60°C. Sulfonyl chloride (60 mmol) was slowly added dropwise. After the addition was completed, the mixture was reacted at 60°C for 3 h. After the reaction is completed, the mixture in the three-necked flask is transferred to a single-necked flask, and the dichloromethane solvent and excess thionyl chloride are removed by rotary evaporation under reduced pressure to obtain the intermediate product palmitoyl chloride; another three-necked flask is added with an appropriate amount of acetone-water mixed solution (the volume ratio of acetone to water is 2:1), aspartic acid (40 mmol) and sodium hydroxide (80 mmol) are added thereto, the temperature is controlled at 35°C, and palmitoyl chloride is slowly added dropwise. During the addition, the pH is controlled to 8-11 with a 10% sodium hydroxide solution. After the addition is completed, the reaction is carried out for 3 hours. After the reaction is completed, the mixture is cooled to room temperature, and the excess solvent is removed by rotary evaporation to obtain palmitoyl amino acid salt; the above product is dissolved in dichloromethane, triethylamine (200 mmol), 4-dimethylaminopyridine (2 mmol) and phenylalanine (40 mmol) are added in sequence, and then the polypeptide condensation reagent 2-(7-azabenzotriazole)-N,N,N',N'-tetramethyluronium hexafluorophosphate (40 mmol) is added, and the reaction is carried out at 35°C for 3 hours. After the reaction is completed, dichloromethane is added to extract 1 to 2 times. The organic layer is washed with deionized water 3 times and dried with anhydrous sodium sulfate. Filter by suction, take the filtrate, and remove the excess solvent by rotary evaporation. Purify by column chromatography (the eluent is a mixed solvent of petroleum ether and ethyl acetate with a volume ratio of 2:1) to obtain a light yellow liquid. Add this liquid, sodium hydroxide (40mmol) and 100ml of ethanol to a 500ml single-necked flask, install a cold and warm reflux device, and react at 70℃ for 2h. After the reaction is completed, cool to room temperature. After adding ethyl acetate, a white solid precipitates. Filter by suction to obtain the target product, that is, an amino acid anionic surfactant.

[0037] Characterization: 1H NMR (400MHz, CD3OD) δ7.45(d,2H), δ7.31-7.14(m,5H), δ4.67-4.53(m,1H), δ3.22-2.92(m,2H), δ2. 17-2.13 (m, 2H), δ1.48 (dt, J=46.6, 23.5Hz, 2H), δ1.39-1.27 (m, 27H), δ0.90 (t, J=6.8, 6.8Hz, 3H).

[0038] Embodiment 2:

[0039] Pretreatment time is one of the very important factors. It takes a certain amount of time for the penetrant to dissolve and disperse in the working solution. If the time is too short, the effective ingredients will not have time to react with the fiber and the treatment effect will be unsatisfactory. It takes a certain amount of time for the effective ingredients in the working solution to gradually diffuse into the fiber and react with the impurities and pigments on the fiber. Therefore, it is necessary to explore the effect of treatment time on the pretreatment effect of cotton fabrics. The working solution is prepared according to the process prescription. The process prescription is as follows: disperse sodium hydroxide, hydrogen peroxide, and penetrant in water to prepare a working solution; the working solution contains 10 g / L sodium hydroxide, 20 g / L hydrogen peroxide solution, and 1 g / L amino acid anionic surfactant.

[0040] A 200mm*50mm plain woven cotton grey fabric was selected and immersed in the working solution. The mass ratio of the cotton grey fabric to the working solution was 1:30. The working solution was heated to 90°C and kept warm for 20 to 60 minutes. The treated grey fabric was then taken out and washed with 90°C hot water, then washed twice with 60°C water, and placed in a 50°C oven to constant weight.

[0041] The fabric treated by this method was measured with reference to the standards GB / T 8424.2-2001 "Textiles - Colour Fastness Test - Instrumental Assessment of Relative Whiteness", FZ / T 01071-2008 "Test Method for Capillary Effect of Textiles", and desizing rate calculation (weighing method), and the characterization indicators of the treated cotton woven fabric were shown in Table 1.

[0042] Table 1 Effect of treatment time on pretreatment effect of cotton fabric

[0043] Time / min Whiteness / % <![CDATA[Wicking effect / cm·30min -1 > Desizing rate / % 20 85.5 12.3 10.74 30 86.1 13.5 10.78 40 87.5 15.1 12.22 50 86.8 14.9 11.09 60 87.2 14.8 11.68

[0044] It can be seen that appropriate treatment time has a greater impact on the pretreatment effect of cotton fabric. When the pretreatment time of cotton fabric is 40 minutes, the whiteness, hair effect and desizing rate of the obtained cotton fabric are the best.

[0045] Embodiment 3:

[0046] Appropriate temperature can make the fiber fully swell. In the presence of a large amount of surfactants, the surface tension of the fabric decreases rapidly, which is beneficial to the bleaching effect of the bleaching active ingredients on the fibers and the removal of impurities and pigments, thereby improving the bleaching effect. When the temperature is too high, a lot of energy is consumed, resulting in increased production costs. Therefore, it is necessary to explore the effect of treatment temperature on the pretreatment effect of cotton fabrics. The working solution is prepared according to the process prescription. The process prescription is as follows: disperse sodium hydroxide, hydrogen peroxide, and penetrant in water to prepare a working solution; the working solution contains 10 g / L sodium hydroxide, 20 g / L hydrogen peroxide solution, and 1 g / L amino acid anionic surfactant.

[0047] A 200mm*50mm plain woven cotton grey fabric was selected and immersed in the working solution. The mass ratio of the cotton grey fabric to the working solution was 1:30. The working solution was heated to 50-90°C and kept warm for 40 minutes. The treated grey fabric was then taken out and washed with 90°C hot water, then washed twice with 60°C water, and placed in a 50°C oven to constant weight.

[0048] The fabric treated by this method was measured with reference to the standards GB / T 8424.2-2001 "Textiles - Colour Fastness Test - Instrumental Assessment of Relative Whiteness", FZ / T 01071-2008 "Test Method for Capillary Effect of Textiles", and desizing rate calculation (weighing method), and the characterization indicators of the treated cotton woven fabric were shown in Table 2.

[0049] Table 2 Effect of treatment temperature on pretreatment effect of cotton fabric

[0050] Temperature / ℃ Whiteness / % <![CDATA[Wicking effect / cm·30min -1 > Desizing rate / % 50 77.9 9.2 9.35 60 79.9 10.8 10.82 70 81.5 11.6 10.86 80 85.2 13.1 11.08 90 87.5 15.1 12.22

[0051] It can be seen that the appropriate treatment temperature has a great influence on the pretreatment effect of cotton fabric. When the pretreatment temperature of cotton fabric is 90℃, the whiteness, wool effect and desizing rate of the obtained cotton fabric are the best.

[0052] Embodiment 4:

[0053] Cotton fabric sizing mainly uses starch slurry. Starch will swell under the action of sodium hydroxide solution, causing the starch to fall off the fabric. The addition of penetrant can effectively improve the desizing rate of the fabric after pretreatment. Therefore, it is necessary to explore the effect of sodium hydroxide concentration on the pretreatment effect of cotton fabric. The working solution is prepared according to the process prescription. The process prescription is as follows: sodium hydroxide, hydrogen peroxide, and penetrant are dispersed in water to prepare a working solution; the working solution contains 5-25 g / L sodium hydroxide, 20 g / L hydrogen peroxide solution, and 1 g / L amino acid anionic surfactant.

[0054] A 200mm*50mm plain woven cotton grey fabric was selected and immersed in the working solution. The mass ratio of the cotton grey fabric to the working solution was 1:30. The working solution was heated to 90°C and kept warm for 40 minutes. The treated grey fabric was then taken out and washed with 90°C hot water, then washed twice with 60°C water, and placed in a 50°C oven to constant weight.

[0055] The fabrics treated by this method were measured with reference to the standards GB / T 8424.2-2001 “Textiles - Colour Fastness Tests - Instrumental Assessment of Relative Whiteness”, FZ / T 01071-2008 “Test Method for Capillary Effect of Textiles”, and desizing rate calculation (weighing method), and the characterization indicators of the treated cotton woven fabrics were shown in Table 3.

[0056] Table 3 Effect of sodium hydroxide concentration on cotton fabric pretreatment effect

[0057] <![CDATA[Sodium hydroxide / g·L -1 > Whiteness / % <![CDATA[Wicking effect / cm·30min -1 > Desizing rate / % 5 85.3 13.3 10.29 10 87.5 15.1 12.22 15 87.6 15.1 12.13 20 87.2 14.1 11.73 25 87.4 14.8 12.05

[0058] It can be seen that when the sodium hydroxide concentration in the cotton fabric pre-treatment solution is 10g / L, the indicators of the obtained cotton fabric are better.

[0059] Embodiment 5:

[0060] Hydrogen peroxide is the main bleaching ingredient in the pretreatment working solution, and has a significant effect on fabric bleaching. Its function is to destroy the conjugated system of natural pigments in cotton fibers to achieve the purpose of decolorizing and bleaching cotton fabrics. Therefore, it is necessary to explore the effect of hydrogen peroxide concentration on the pretreatment effect of cotton fabrics. The working solution is prepared according to the process prescription. The process prescription is as follows: sodium hydroxide, hydrogen peroxide, and penetrant are dispersed in water to prepare a working solution; the working solution contains 10 g / L sodium hydroxide, 10-50 g / L hydrogen peroxide solution, and 1 g / L amino acid anionic surfactant.

[0061] A 200mm*50mm plain woven cotton grey fabric was selected and immersed in the working solution. The mass ratio of the cotton grey fabric to the working solution was 1:30. The working solution was heated to 90°C and kept warm for 40 minutes. The treated grey fabric was then taken out and washed with 90°C hot water, then washed twice with 60°C water, and placed in a 50°C oven to constant weight.

[0062] The fabric treated by this method was measured with reference to the standards GB / T 8424.2-2001 “Textiles - Colour Fastness Test - Instrumental Assessment of Relative Whiteness”, FZ / T 01071-2008 “Test Method for Capillary Effect of Textiles”, and desizing rate calculation (weighing method), and the characterization indicators of the treated cotton woven fabric were shown in Table 4.

[0063] Table 4 Effect of hydrogen peroxide concentration on cotton fabric pretreatment effect

[0064] Hydrogen peroxide (g / L) Whiteness / % <![CDATA[Wicking effect / cm·30min -1 > Desizing rate / % 10 85.5 14.5 11.81 20 87.5 15.1 12.22 30 89.3 15.3 12.08 40 88.7 14.8 11.88 50 88.9 14.6 11.92

[0065] It can be seen that when the hydrogen peroxide concentration in the cotton fabric pre-treatment solution is 20-30 g / L, the various indicators of the obtained cotton fabric are better.

[0066] Embodiment 6:

[0067] The penetrant has a synergistic effect on the desizing effect of sodium hydroxide and the bleaching effect of hydrogen peroxide. Therefore, it is necessary to explore the effect of penetrant concentration on the pretreatment effect of cotton fabric. The working solution is prepared according to the process prescription. The process prescription is as follows: sodium hydroxide, hydrogen peroxide, and penetrant are dispersed in water to prepare a working solution; the working solution contains 10 g / L sodium hydroxide, 20 g / L hydrogen peroxide solution, and 1-5 g / L amino acid anionic surfactant.

[0068] A 200mm*50mm plain woven cotton grey fabric was selected and immersed in the working solution. The mass ratio of the cotton grey fabric to the working solution was 1:30. The working solution was heated to 90°C and kept warm for 40 minutes. The treated grey fabric was then taken out and washed with 90°C hot water, then washed twice with 60°C water, and placed in a 50°C oven to constant weight.

[0069] The fabrics treated by this method were measured with reference to the standards GB / T 8424.2-2001 “Textiles - Colour Fastness Tests - Instrumental Assessment of Relative Whiteness”, FZ / T 01071-2008 “Test Method for Capillary Effect of Textiles”, and desizing rate calculation (weighing method), and the characterization indicators of the treated cotton woven fabrics were shown in Table 5.

[0070] Table 5 Effect of penetrant concentration on pretreatment effect of cotton fabric

[0071] <![CDATA[Penetrant / g·L -1 > Whiteness / % <![CDATA[Wicking effect / cm·30min -1 > Desizing rate / % 0 82.3 12.1 10.80 1 87.5 15.1 12.22 2 87.7 14.5 12.66 3 89.3 15.2 13.94 4 87.8 14.3 13.08 5 88.3 14.5 13.24

[0072] It can be seen that the addition of penetrant can significantly improve the whiteness, hairiness, and desizing rate of cotton fabric pretreatment, and when the penetrant concentration is 3g·L -1 When the whiteness, hair effect and desizing rate of the cotton fabric obtained are the best.

[0073] In summary, the present invention provides a penetrant for pretreatment of cotton fabrics, which is based on a one-bath descaling, bleaching and scouring method for cotton fabrics. Through testing, it is found that the cotton fabric pretreatment penetrant of the present invention has the characteristics of high permeability. After optimization, the mass ratio of sodium hydroxide, hydrogen peroxide and penetrant is 10:(20-30):(3-5), the pretreatment temperature is controlled to be 90°C, the time is 40min, and the bath ratio is 1:30. The cotton fabric hair effect obtained by using this penetrant in combination with the optimized process is 15.2cm·30min -1The whiteness is above 85%, and the process is simple and easy to operate, which is beneficial to reducing energy consumption and reducing sewage discharge. It can be applied to industrial production and processing, and at the same time has certain economic benefits and is in line with the concept of green economy.

[0074] Comparative Example 1

[0075] Referring to the following process prescription, the working solution contains 10g / L sodium hydroxide, 20g / L hydrogen peroxide solution, and 3g / L penetrant. The penetrant is replaced by the amino acid anionic surfactant with sodium dodecyl sulfate and sodium oleate amino acid at the same concentration, and the process flow remains unchanged.

[0076] The fabrics treated by this method were measured with reference to the standards GB / T 8424.2-2001 “Textiles - Colour Fastness Tests - Instrumental Assessment of Relative Whiteness”, FZ / T 01071-2008 “Test Method for Capillary Effect of Textiles” and desizing rate calculation (weighing method), and the characterization indicators of the treated cotton woven fabrics were shown in Table 6.

[0077] Table 6 Effect of different penetrants on cotton fabric pretreatment

[0078]

[0079] It can be seen that the amino acid anionic surfactant provided by the present invention as a penetrant for pre-treatment of cotton fabrics has better whiteness, hair effect and desizing rate than traditional penetrants.

[0080] In addition, compared with other reported amino acid penetrants (such as sodium oleate amino acid), the amino acid anionic surfactant of the present invention has an excellent desizing effect on raw cotton grey cloth, significantly improves the whiteness and hair effect of the fabric, effectively reduces the damage to the fabric during the treatment process, and has important economic benefits.

[0081] The examples provided above are not intended to limit the scope of the present invention, and the steps described are not intended to limit the execution order thereof. Those skilled in the art may make limited improvements to the present invention in combination with existing common knowledge, which also fall within the scope of protection defined by the claims of the present invention.

Claims

1. A penetrant for pretreatment of cotton fabrics, characterized in that: It contains an amino acid anionic surfactant with a structure shown in formula (I); Wherein, M is Na or K.

2. A penetrant for cotton fabric pretreatment according to claim 1, characterized in that: The penetrant is an amino acid anionic surfactant having a structure shown in formula (I), or a combination of an amino acid anionic surfactant having a structure shown in formula (I) and at least one of fatty alcohol polyoxyethylene ether and sodium lauryl sulfate.

3. The use of the amino acid anionic surfactant of the structure represented by formula (I) as claimed in claim 1 in the pretreatment process of cotton woven fabrics, characterized in that: The amino acid anionic surfactant with a structure shown in formula (I) is used as a pre-treatment penetrant for cotton fabrics.

4. A working solution for pre-treatment of cotton fabrics, characterized in that: The invention comprises the penetrant according to claim 1 or 2, sodium hydroxide, hydrogen peroxide and deionized water.

5. The working solution for pre-treatment of cotton fabric according to claim 4, characterized in that: The concentration of the penetrant in the pretreatment working solution is 1-5 g / L.

6. The working solution for pre-treatment of cotton fabric according to claim 4, characterized in that: The concentration of sodium hydroxide in the pretreatment working solution is 5 to 25 g / L.

7. The working solution for pre-treatment of cotton fabric according to claim 4, characterized in that: The concentration of the hydrogen peroxide solution in the pretreatment working solution is 10-50 g / L.

8. The working solution for pre-treatment of cotton fabric according to claim 4, characterized in that: The concentration of the penetrant in the pretreatment working solution is 3-5 g / L, the concentration of the sodium hydroxide is 10-25 g / L, and the concentration of the hydrogen peroxide solution is 20-40 g / L.

9. A one-bath descaling and bleaching pretreatment process for cotton fabrics, characterized in that: The method comprises immersing the cotton grey cloth into the cotton fabric pretreatment working solution described in any one of claims 4 to 8, heating the cloth for reaction for a period of time, and then washing and drying the cloth after the reaction is completed.

10. The method according to claim 9, characterized in that The mass ratio of the cotton grey cloth to the working liquid is 1:30, the heating reaction temperature is 50-90°C, and the time is 20-60min.

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