Cotton fabric ozone pretreatment auxiliary agent system and ozone pretreatment process

Abstract

The invention belongs to the technical field of textile printing and dyeing, and particularly relates to a cotton fabric ozone pretreatment assistant system and process, the cotton fabric ozone pretreatment assistant system comprises a reagent A and a reagent B. The reagent A is a cold pad batch assistant, and the formula comprises a refining agent DM1346F, hydrogen peroxide, a low-temperature bleaching activator, NaOH and water; and the reagent B is a working solution and comprises a cellulose protective agent, a penetrant and water. Based on the cotton fabric ozone pretreatment auxiliary agent system provided by the invention, the invention further provides a cotton fabric pretreatment process which comprises the following steps: cold pad-batch, water washing, working solution padding, ozone pretreatment, water washing and drying. The cotton fabric can be treated at normal temperature by using the assistant and ozone for treatment, the strength retention rate of the fabric is more than 90%, and by adopting the decolorizing method, about 60% of water and steam can be saved, 65% of assistant is saved, and about 55% of CO2 emission is reduced.

Description

Technical Field

[0001] The present application belongs to the field of textile printing and dyeing, and specifically relates to an ozone pretreatment auxiliary system for cotton fabrics and an ozone pretreatment process using the auxiliary system. Background Art

[0002] Cotton fabrics from weaving mills that have not been dyed and finished are called grey fabrics. Grey fabrics contain a large amount of impurities, including cottonseed hulls, pectin, waxy substances, ash, etc., as well as oils added during spinning and weaving, sizing on warp yarns, and stains during storage and transportation. The above impurities make the grey fabric yellow, rough to the touch, and extremely poor in water absorption, making post-processing difficult. After the cotton grey fabric enters the printing and dyeing factory, it needs to be pre-treated by desizing, scouring, bleaching, etc. to improve its water absorption and whiteness. The traditional pre-treatment of cotton fabrics is carried out at high temperatures, and a large amount of caustic soda and additives are required, which consumes a lot of energy and water, causes great damage to the fabric, and requires a large amount of hot and cold water circulation after the pre-treatment, resulting in high COD of wastewater and difficulty in treatment. Therefore, it is urgent to develop green and clean pre-treatment processes and supporting auxiliary systems to enable the transformation and upgrading of the traditional printing and dyeing industry.

[0003] Ozone has strong zinc oxide properties and is often produced using air or oxygen as raw materials through ultraviolet irradiation, corona discharge, and electrochemical methods. Due to the strong oxidizing properties of ozone and the lack of secondary pollution, it can be used for "green" dyeing and finishing of textiles. The application of ozone in the textile dyeing and finishing industry is mainly concentrated in the treatment of dyeing and finishing wastewater, waste liquid, and the decolorization of dyed fabrics. In the presence of water, ozone is prone to hydrolysis to produce a series of highly active free radicals, which then react with the pulp, cottonseed hulls, pectin, wax, etc. in the grey cloth. It can also break the unsaturated double bonds in the pigment and destroy its color system. Therefore, it has broad application prospects in the field of cotton fabric pretreatment.

[0004] In recent years, some studies have reported on methods of pre-treating fabrics using ozone. The Chinese patent publication number is CN116876197A, and the invention name is a method for ozone treatment of cotton fabrics. The application discloses that after the cotton fabric is impregnated with a pre-treatment auxiliary agent, it is passed through a continuous ozone device to react with gaseous ozone to achieve the effects of removing impurities, desizing, improving whiteness and improving wettability, and then undergoing reduction water washing, continuous water washing and drying to complete the pre-treatment process. The pre-treatment auxiliary agent used in this method is a biological enzyme. Since the biological enzyme has a single effect, the biological enzyme can only desizing a single slurry such as starch, and is not universal, and the cost of the biological enzyme is relatively high. The Chinese patent publication number is CN105177979A, and the invention name is an ozone-ultrasonic coordinated textile scouring and dyeing method and device. The application discloses that an ozone generator that can generate high-concentration ozone gas is connected to the existing dyeing machine device, and an air dissolving pump is used to mix water liquid to form ozone liquid, and then pass it into a closed dyeing tank. At the same time, an ultrasonic transducer is installed on the existing dyeing machine device to perform ultrasonic synergistic treatment on the scouring, dyeing, washing, and repair bleaching processes. The ozone treatment environment of this method is liquid phase, and the ozone pre-treatment link still requires the participation of a certain amount of water, and an ultrasonic synergistic treatment device needs to be added at the same time, and the process flow is relatively complicated. The Chinese patent number is CN106381680A, and the invention name is a method for scouring and bleaching cotton fabrics using ozone in the gas phase. The application discloses that the desized cotton fabric is immersed in a solution containing a certain non-ionic penetrant, and repeatedly immersing and rolling it to make it contain a certain liquid rate, and then entering the ozone reaction chamber. The fabric is treated above the aqueous solution in the reaction chamber. After the treatment, the fabric enters the free radical scavenger solution for rinsing. After the rinsing is completed, it continues to be washed with hot water, cold water, and finally dried. The processing object of this method is the desized cotton fabric, and the auxiliary system used cannot achieve the desizing function. The Chinese patent number is CN108914543A, and the invention name is a cotton fabric hydrogen peroxide, ozone descaling, boiling and bleaching one-bath pretreatment method. The application discloses a cotton fabric hydrogen peroxide, ozone descaling, boiling and bleaching one-bath pretreatment method, comprising the following steps: impregnation with an impregnation liquid, hot water washing, cold water washing, and dehydration; wherein the impregnation liquid is composed of 30% hydrogen peroxide in an amount of 1.5-10.5g / L, non-ionic surfactant 1-5g / L; ozone 0.05-1g / L; the impregnation conditions are an impregnation liquid pH value of 3-10; an impregnation temperature of 10-40°C; a bath ratio of 1:5-1:15; a time of 10-50min; hot water washing is washing with warm water at 60-80°C to remove impurities remaining on the fabric after being decomposed by hydrogen peroxide and ozone. The auxiliary agent system used in this method involves only a single type of surfactant, which cannot achieve effective emulsification of various types of impurities on the grey cloth and effective penetration of the oxidant in the fabric. In addition, the ozone treatment time is relatively long, resulting in a strength loss of more than 20% in the cotton fabric.

[0005] In order to adapt to the characteristics of high impurity content and complex composition of cotton grey cloth, it is urgent to find an efficient cotton fabric pretreatment auxiliary system and a corresponding treatment process that can reduce water and steam consumption and wastewater discharge while ensuring the pretreatment effect. Summary of the invention

[0006] In view of the defects existing in the field of green dyeing and finishing, especially in the scheme of using ozone for pre-treatment of cotton fabrics, for example, the use of a large amount of water vapor leads to high costs, the strength loss of plants after treatment reaches a certain level, the desizing and bleaching effects are not good, etc., the present invention provides a cotton fabric ozone pre-treatment auxiliary agent system and an ozone pre-treatment process using the auxiliary agent system to solve the above problems.

[0007] One of the concepts of the present invention is to provide a green dyeing and finishing auxiliary agent, in particular, a dyeing and finishing auxiliary agent system for ozone pretreatment, wherein the auxiliary agent system comprises reagent A and reagent B, reagent A is a cold pad batch reagent, comprising a refining agent, hydrogen peroxide, a low-temperature bleaching activator, and NaOH; the reagent B is a padding reagent, comprising a cellulose protective agent and a penetrant, and after the dyeing and finishing auxiliary agent system is combined with an ozone treatment process, the wool effect of the cotton fabric is ≥14cm / 30min, the whiteness is ≥85, and the strength retention rate is ≥90%; at the same time, the use of the auxiliary agent system can significantly reduce energy consumption and the amount of auxiliary agent used.

[0008] Specifically, in order to solve the above problems, the present invention provides an auxiliary agent system for ozone pretreatment of cotton fabrics, wherein the auxiliary agent system comprises reagent A and reagent B;

[0009] The reagent A is a cold pad-batch reagent, and the reagent B is a padding reagent;

[0010] It should be noted that the cold rolling batch reagent and the padding reagent are reagent formulas, which does not mean that specific reagents must be mixed together when stored; technicians in this field can store and use them appropriately according to the physicochemical properties of each reagent.

[0011] The ozone pretreatment auxiliary agent system is applied to the pretreatment of cotton fabrics;

[0012] The pre-treatment of the cotton fabric includes cold padding and padding processes;

[0013] Further, the cold pad batch reagent includes a refining agent, hydrogen peroxide, a low temperature bleaching activator and sodium hydroxide (NaOH);

[0014] Furthermore, the refining agent is refining agent DM1346F;

[0015] The concentration of the hydrogen peroxide is 20-35%;

[0016] Further, the reagent A is added into water to form a cold pad-batch working solution;

[0017] In the cold pad batch working fluid, the refining agent is DM1346F, and the dosage is 5-10g / L;

[0018] The dosage of the hydrogen peroxide is 35% hydrogen peroxide 3-5g / L;

[0019] The low temperature bleaching activator is NOBS, and the dosage is 0.5-1g / L;

[0020] The dosage of NaOH is 10-20 g / L.

[0021] In another embodiment, the padding reagent includes a cellulose protective agent and a penetrant;

[0022] The cellulose protective agent is at least one of sodium citrate, PVA, chitosan and anthraquinone;

[0023] The penetrant is a complex of anionic surfactant and nonionic surfactant;

[0024] Furthermore, the anionic surfactant has a carbon number between C 10-15 The linear alkylbenzene sulfonic acid sodium salt is between C 8-13 Isomeric alcohol polyoxyethylene ether phosphates;

[0025] Further, the reagent B is added into water to form a padding working solution;

[0026] Wherein, the dosage of cellulose protective agent is 1%-2% (owf);

[0027] The penetrant is a complex of anionic surfactant and nonionic surfactant, and the dosage is 1-2g / L.

[0028] In another embodiment, the present invention further provides a cotton fabric ozone pretreatment process, wherein the pretreatment process uses the above-mentioned cotton fabric ozone pretreatment auxiliary agent system, and the ozone pretreatment process includes a cold pad-batch process and a padding process;

[0029] The cold pad-batch process is to place the cotton fabric in a working solution containing reagent A, pad it in a padding tank, and after padding, stack it to obtain the cotton fabric treated by the cold pad-batch process;

[0030] The stacking time is 10-48h;

[0031] In some embodiments, the cold pad-batch process may wash the cotton fabric after the padding is completed;

[0032] The padding process is to place the cotton fabric treated by the cold pad-batch process in a working solution containing reagent B and perform padding to obtain the cotton fabric treated by the padding process;

[0033] The rolling rate of the rolling working solution in the rolling process is 60%-120%

[0034] In another embodiment, the cotton fabric treated by the padding process is pre-treated with ozone;

[0035] The ozone pretreatment is to place the cotton fabric treated by the padding process in a box filled with ozone gas for pretreatment, and then wash and dry the fabric after the pretreatment.

[0036] The process conditions of the ozone treatment in the box are: ozone flow rate 2-3L / min, ozone concentration 50-100mg / L, box temperature 20-40°C, and treatment time 2-5min.

[0037] In another embodiment, the present invention specifically provides a cotton fabric ozone pretreatment process, comprising the following steps:

[0038] (1) The cotton fabric is placed in a rolling tank containing a cold rolling aid for padding. After padding, the fabric is piled for 24 hours and then washed with water.

[0039] (2) placing the fabric obtained in step (1) in a working solution containing a cellulose protective agent, a penetrant and water for impregnation, placing the fabric in a box filled with ozone gas for pretreatment after impregnation, and washing and drying the fabric after pretreatment.

[0040] The beneficial effects of the present invention are:

[0041] 1. Before ozone pretreatment, the cotton grey fabric is first subjected to cold pad-batch treatment. The purpose of the cold pad-batch is to pretreat the impurities on the cotton grey fabric and to expand the fibers, providing favorable conditions for the subsequent ozone treatment. Therefore, in this formula, the amount of auxiliary agent is only one-third of the conventional pretreatment amount. At the same time, a low-temperature bleaching activator is added to the cold pad-batch formula to improve the bleaching efficiency of hydrogen peroxide in a room temperature environment.

[0042] 2. In this pre-treatment process, cold padding and ozone treatment are both carried out at room temperature without the use of steam. The pH value of the padding working solution before ozone treatment is neutral. After ozone treatment, no neutralization is required, and the impurities on the cotton grey cloth are oxidized and decomposed. Only a small amount of penetrant is left on the fabric, which can be dried after two water washings. Compared with conventional pre-treatment and post-washing, it can save more than 60% of water, while reducing the COD and discharge of printing and dyeing wastewater.

[0043] 3. Conventional pretreatment processes will cause certain losses in the strength of cotton fabrics, and this effect is particularly obvious in an ozone environment. The working solution provided in the present invention adds a cellulose protective agent, and the ozone treatment does not involve high temperature and caustic soda, so the potential damage to cotton fabrics is small, and the strength retention rate of cotton fabrics after treatment is ≥90%. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is described in detail, clearly and completely in conjunction with the embodiments below. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0045] Example 1

[0046] The cotton fabric ozone pretreatment auxiliary agent system used in this embodiment includes reagent A, which includes refining agent DM1346F, 35% hydrogen peroxide, low-temperature bleaching activator NOBS, and NaOH;

[0047] Reagent B is a composite penetrant of cellulose protective agent sodium citrate, sodium alkylbenzene sulfonate and isomeric alcohol polyoxyethylene ether phosphate;

[0048] The reagent A is a cold pad-batch reagent, and the reagent B is a padding reagent;

[0049] The working solution of reagent A cold pad-batch reagent and water is 7 g / L of refining agent DM1346F, 4 g / L of 35% hydrogen peroxide, 1 g / L of low-temperature bleaching activator NOBS, 15 g / L of NaOH, and the rest is water.

[0050] The working solution of reagent B padding reagent and water is 1% (owf) of cellulose protective agent sodium citrate, 1g / L of alkylbenzene sulfonate and isomeric alcohol polyoxyethylene ether phosphate composite penetrant, and the rest is water.

[0051] The following process is used to treat cotton fabrics: cold pad-batch (reagent A cold pad-batch reagent and water as a working solution) → water washing → padding (reagent B padding reagent and water as a working solution) → ozone pretreatment → water washing → drying. The specific process parameters are as follows:

[0052] Cold pad-batch and water washing: Place the cotton fabric in a padding tank containing a cold pad-batch auxiliary agent for padding. After padding, pile it for 24 hours and then wash it with water.

[0053] Padding and ozone pretreatment: The fabric obtained in step (1) is placed in a working solution containing a cellulose protective agent, a penetrant and water for padding, with a padding rate of 80%. After padding, the fabric is placed in a box filled with ozone gas for pretreatment. The process conditions for ozone treatment are: ozone flow rate 2L / min, ozone concentration 80mg / L, box temperature 25°C, and treatment time 3min.

[0054] Washing and drying: Hot water washing: Use warm water at 60℃ to wash to remove the residual auxiliaries and decompose impurities on the fabric after pre-treatment, then wash with cold water and finally dry.

[0055] After the above treatment, the capillary effect of the cotton fabric reaches 16 cm / 30 min, the whiteness of the cotton fabric measured by a whiteness meter is 88, and the strength retention rate of the cotton fabric measured by an Instron universal strength tester is 91%.

[0056] Example 2

[0057] The cotton fabric ozone pretreatment auxiliary agent system used in this embodiment includes reagent A, which includes refining agent DM1346F, 35% hydrogen peroxide, low-temperature bleaching activator NOBS, and NaOH;

[0058] Reagent B is a composite penetrant of cellulose protective agent chitosan and PVA, sodium alkylbenzene sulfonate and isomeric alcohol polyoxyethylene ether phosphate;

[0059] The reagent A is a cold pad-batch reagent, and the reagent B is a padding reagent;

[0060] The working solution of reagent A cold pad-batch reagent and water is 5 g / L of refining agent DM1346F, 3 g / L of 35% hydrogen peroxide, 1 g / L of low-temperature bleaching activator NOBS, 20 g / L of NaOH, and the rest is water.

[0061] The working solution of reagent B padding reagent and water is cellulose protective agent chitosan and PVA 1% (owf), sodium alkylbenzene sulfonate and isomeric alcohol polyoxyethylene ether phosphate composite penetrant 1g / L, and the rest is water.

[0062] The following process is used to treat cotton fabrics: cold pad-batch (reagent A cold pad-batch reagent and water as a working solution) → water washing → padding (reagent B padding reagent and water as a working solution) → ozone pretreatment → water washing → drying. The specific process parameters are as follows:

[0063] Cold pad-batch and water washing: The cotton fabric is placed in a padding tank containing a working solution prepared by cold pad-batch reagent A and water for padding. After padding, the fabric is piled for 24 hours and then washed with water.

[0064] Padding and ozone pretreatment: The fabric obtained in step (1) is placed in a working solution containing reagent B padding reagent and water for padding, with a padding rate of 70%. After padding, the fabric is placed in a box filled with ozone gas for pretreatment. The process conditions for ozone treatment are: ozone flow rate 2.5L / min, ozone concentration 60mg / L, box temperature 30°C, and treatment time 3min.

[0065] Washing and drying: Hot water washing: Use 60℃ warm water to wash to remove residual auxiliaries and decompose impurities on the fabric after pre-treatment; Cold water washing: Use cold water at normal temperature to wash, and then dry.

[0066] After the above treatment, the capillary effect of the cotton fabric reaches 15cm / 30min, the whiteness of the cotton fabric measured by a whiteness meter is 85, and the strength retention rate of the cotton fabric measured by an Instron universal strength tester is 93%.

[0067] Example 3

[0068] The cotton fabric ozone pretreatment auxiliary agent system used in this embodiment includes reagent A, which includes refining agent DM1346F, 35% hydrogen peroxide, low-temperature bleaching activator NOBS, and NaOH;

[0069] Reagent B is a composite penetrant of cellulose protective agent anthraquinone, sodium alkylbenzene sulfonate and isomeric alcohol polyoxyethylene ether phosphate;

[0070] The reagent A is a cold pad-batch reagent, and the reagent B is a padding reagent;

[0071] The working solution of reagent A cold pad-batch reagent and water is 9 g / L of refining agent DM1346F, 5 g / L of 35% hydrogen peroxide, 0.5 g / L of low-temperature bleaching activator NOBS, 15 g / L of NaOH, and the rest is water.

[0072] The working solution of reagent B padding reagent and water is 1% (owf) of cellulose protective agent anthraquinone, 1g / L of sodium alkylbenzene sulfonate and isomeric alcohol polyoxyethylene ether phosphate composite penetrant, and the rest is water.

[0073] The following process is used to treat cotton fabrics: cold pad-batch (reagent A cold pad-batch reagent and water as a working solution) → water washing → padding (reagent B padding reagent and water as a working solution) → ozone pretreatment → water washing → drying. The specific process parameters are as follows:

[0074] Cold pad-batch and water washing: The cotton fabric is placed in a padding tank containing a working solution prepared by cold pad-batch reagent A and water for padding. After padding, the fabric is piled for 24 hours and then washed with water.

[0075] Padding and ozone pretreatment: The fabric obtained in step (1) is placed in a working solution containing a cellulose protective agent, a penetrant and water for padding, with a padding rate of 90%. After padding, the fabric is placed in a box filled with ozone gas for pretreatment. The process conditions for ozone treatment are: ozone flow rate 3L / min, ozone concentration 100mg / L, box temperature 25°C, and treatment time 4min.

[0076] Washing and drying: Hot water washing: Use warm water at 60℃ to wash to remove the residual additives and decompose impurities on the fabric after pre-treatment. Cold water washing: Use cold water at normal temperature to wash, and then dry.

[0077] After the above treatment, the capillary effect of the cotton fabric reaches 17 cm / 30 min, the whiteness of the cotton fabric measured by a whiteness meter is 88, and the strength retention rate of the cotton fabric measured by an Instron universal strength tester is 90%.

[0078] Example 4

[0079] The cotton fabric ozone pretreatment auxiliary agent system used in this embodiment includes reagent A, which includes refining agent DM1346F, 35% hydrogen peroxide, low-temperature bleaching activator NOBS, and NaOH;

[0080] Reagent B is a composite penetrant of cellulose protective agent sodium citrate and PVA, sodium alkylbenzene sulfonate and isomeric alcohol polyoxyethylene ether phosphate;

[0081] The reagent A is a cold pad-batch reagent, and the reagent B is a padding reagent;

[0082] The working solution of reagent A cold pad-batch reagent and water is 5 g / L of refining agent DM1346F, 5 g / L of 35% hydrogen peroxide, 1 g / L of low-temperature bleaching activator NOBS, 10 g / L of NaOH, and the rest is water.

[0083] The working solution of reagent B padding reagent and water is cellulose protective agent sodium citrate and PVA1% (owf), sodium alkylbenzene sulfonate and isomeric alcohol polyoxyethylene ether phosphate composite penetrant 0.5g / L, and the rest is water.

[0084] The following process is used to treat cotton fabrics: cold pad-batch (reagent A cold pad-batch reagent and water as a working solution) → water washing → padding (reagent B padding reagent and water as a working solution) → ozone pretreatment → water washing → drying. The specific process parameters are as follows:

[0085] Cold pad-batch and water washing: The cotton fabric is placed in a padding tank containing a working solution prepared by cold pad-batch reagent A and water for padding. After padding, the fabric is piled for 24 hours and then washed with water.

[0086] Padding and ozone pretreatment: The fabric obtained in step (1) is placed in a working solution containing reagent B padding reagent and water for padding, with a padding rate of 60%. After padding, the fabric is placed in a box filled with ozone gas for pretreatment. The process conditions for ozone treatment are: ozone flow rate 2L / min, ozone concentration 50mg / L, box temperature 30°C, and treatment time 3min.

[0087] Washing and drying: Hot water washing: Use warm water at 60℃ to wash to remove the residual additives and decompose impurities on the fabric after pre-treatment. Cold water washing: Use cold water at normal temperature to wash, and then dry.

[0088] After the above treatment, the capillary effect of the cotton fabric reaches 15cm / 30min, the whiteness of the cotton fabric measured by a whiteness meter is 86, and the strength retention rate of the cotton fabric measured by an Instron universal strength tester is 92%.

[0089] Comparative Example 1

[0090] The cotton grey cloth is pre-treated by the traditional three-step method of desizing, scouring and bleaching. The specific process parameters and the auxiliary agent formula involved are as follows:

[0091] Process flow: padding desizing liquid → 100-102℃ steaming for 30min → water washing → padding scouring liquid → 100-102℃ steaming for 30min → water washing → padding bleaching liquid → 100-102℃ steaming for 30min → acid neutralization (acetic acid 5g / L, neutralized to neutral pH) → hot water washing → cold water washing → drying.

[0092] Desizing liquid composition: desizing liquid 15g / L, surfactant 2g / L, rolling rate 100%.

[0093] The composition of the scouring liquid is: NaOH 20g / L, refining agent 5g / L, surfactant 3g / L, and the rolling rate is 100%.

[0094] The composition of the bleaching liquid is: 35% hydrogen peroxide 8g / L, NaOH 5g / L, pH value 10.5, sodium silicate 2g / L, surfactant 2g / L, and the residual rate is 100%.

[0095] After the above treatment, the capillary effect of the cotton fabric is 13cm / 30min, the whiteness of the cotton fabric measured by a whiteness meter is 78, and the strength retention rate of the cotton fabric measured by an Instron universal strength tester is 82%. Compared with this comparative example, the pre-treatment effect of Examples 1-4 is more excellent, and can save about 60% of water and steam, save 65% of the amount of auxiliary agent, and reduce the COD and discharge of pre-treatment wastewater.

[0096] Comparative Example 2

[0097] The difference between this embodiment and embodiment 1 is that there is no cold rolling process. The specific process parameters and the formula of the auxiliary agent system involved are as follows:

[0098] Padding and ozone pretreatment: The cotton blank is placed in a working solution containing the padding reagent B used in Example 1 and water for padding, and the padding rate is 80%. After padding, it is placed in a box filled with ozone gas for pretreatment. The process conditions for ozone treatment are: ozone flow rate 2L / min, ozone concentration 80mg / L, box temperature 25°C, and treatment time 3min.

[0099] Washing and drying: Hot water washing: Use warm water at 60℃ to wash to remove the residual additives and decompose impurities on the fabric after pre-treatment. Cold water washing: Use cold water at normal temperature to wash, and then dry.

[0100] After the above treatment, the capillary effect of the cotton fabric was 9 cm / 30 min, the whiteness of the cotton fabric measured by a whiteness meter was 71, and the strength retention rate of the cotton fabric measured by an Instron universal strength tester was 93%.

[0101] Comparative Example 3

[0102] The difference between this embodiment and embodiment 1 is that there is no ozone treatment process. The specific process parameters and the formula of the auxiliary agent system involved are as follows:

[0103] Cold pad-batch and water washing: Place the cotton fabric in a padding tank containing a cold pad-batch auxiliary agent for padding. After padding, pile it for 24 hours and then wash it with water.

[0104] The cold pad-batch auxiliary agent consists of: refining agent DM1346F 7g / L, 35% hydrogen peroxide 4g / L, low-temperature bleaching activator NOBS 1g / L, NaOH 15g / L, and the rest is water.

[0105] Washing and drying, hot water washing: use 60℃ warm water to wash to remove the residual additives and decompose impurities on the fabric after pre-treatment. Cold water washing: use normal temperature cold water to wash, and then dry.

[0106] After the above treatment, the capillary effect of the cotton fabric was 8 cm / 30 min, the whiteness of the cotton fabric measured by a whiteness meter was 66, and the strength retention rate of the cotton fabric measured by an Instron universal strength tester was 94%.

[0107] Comparative Example 4

[0108] The difference between this embodiment and embodiment 1 is that there is no low-temperature bleaching activator in the cold pad-batch auxiliary composition. The specific process parameters and the auxiliary system formula involved are as follows:

[0109] Cold pad-batch and water washing: Place the cotton fabric in a padding tank containing a cold pad-batch auxiliary agent for padding. After padding, pile it for 24 hours and then wash it with water.

[0110] The cold pad batch additive composition: refining agent DM1346F7g / L, 35% hydrogen peroxide 4g / L, NaOH15g / L, and the rest is water.

[0111] Padding and ozone pretreatment: The fabric obtained in step (1) is placed in a working solution containing a cellulose protective agent, a penetrant and water for padding. After padding, the fabric is placed in a box filled with ozone gas for pretreatment. The process conditions for ozone treatment are: ozone flow rate 2L / min, ozone concentration 80mg / L, box temperature 25°C, and treatment time 3min.

[0112] The working solution consists of 1% (owf) sodium citrate as a cellulose protective agent, 1g / L of sodium alkylbenzene sulfonate and isomeric alcohol polyoxyethylene ether phosphate composite penetrant, and the rest is water. The rolling rate is 80%.

[0113] Washing and drying: Hot water washing: Use warm water at 60℃ to wash to remove the residual additives and decompose impurities on the fabric after pre-treatment. Cold water washing: Use cold water at normal temperature to wash, and then dry.

[0114] After the above treatment, the capillary effect of the cotton fabric reaches 15cm / 30min, the whiteness of the cotton fabric measured by a whiteness meter is 80, and the strength retention rate of the cotton fabric measured by an Instron universal strength tester is 92%.

[0115] Comparative Example 5

[0116] The difference between this embodiment and embodiment 1 is that there is no fiber protection agent and penetrant in the working fluid composition. The specific process parameters and the formula of the auxiliary agent system involved are as follows:

[0117] Cold pad-batch and water washing: Place the cotton fabric in a padding tank containing a cold pad-batch auxiliary agent for padding. After padding, pile it for 24 hours and then wash it with water.

[0118] The cold pad-batch auxiliary agent consists of: refining agent DM1346F 7g / L, 35% hydrogen peroxide 4g / L, low-temperature bleaching activator NOBS 1g / L, NaOH 15g / L, and the rest is water.

[0119] Padding and ozone pretreatment: The fabric obtained in step (1) is immersed in a water tank for padding, so that the fabric liquid carrying rate is 80%, and then placed in a box filled with ozone gas for pretreatment. The process conditions of ozone treatment are: ozone flow rate 2L / min, ozone concentration 80mg / L, box temperature 25°C, and treatment time 3min.

[0120] Washing and drying Hot water washing: Use warm water at 60℃ to wash to remove the residual additives and decompose impurities on the fabric after pre-treatment. Cold water washing: Use cold water at normal temperature to wash, and then dry.

[0121] After the above treatment, the capillary effect of the cotton fabric reaches 16 cm / 30 min, the whiteness of the cotton fabric measured by a whiteness meter is 87, and the strength retention rate of the cotton fabric measured by an Instron universal strength tester is 79%.

[0122] It should be noted that the various embodiments of the present application can be arbitrarily combined into a new embodiment if the solutions do not conflict and the technical solutions can coexist.

[0123] The present application is described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A cotton fabric pretreatment auxiliary system, wherein the ozone pretreatment auxiliary system is used for pretreatment of cotton fabrics, characterized in that: The auxiliary agent system includes reagent A and reagent B; The reagent A is a cold pad-batch reagent, and the reagent B is a padding reagent; The cold pad batch reagents include a refining agent, hydrogen peroxide, a low-temperature bleaching activator and sodium hydroxide; The padding reagent comprises a cellulose protective agent and a penetrant.

2. The cotton fabric pretreatment auxiliary system according to claim 1, characterized in that: The refining agent is refining agent DM1346F; The concentration of the hydrogen peroxide is 20-35%.

3. The cotton fabric pretreatment auxiliary system according to claim 1, characterized in that: The cellulose protective agent is at least one of sodium citrate, PVA, chitosan and anthraquinone; The penetrant is a complex of anionic surfactant and nonionic surfactant.

4. The cotton fabric pretreatment auxiliary system as claimed in claim 3, characterized in that: The anionic surfactant has a carbon number between C 10-15 The linear alkylbenzene sulfonic acid sodium salt is between C 8-13 Isomerized alcohol polyoxyethylene ether phosphate.

5. The cotton fabric pretreatment auxiliary system according to claim 2, characterized in that: The reagent A is added into water to form a cold pad batch working solution; Wherein, in the cold pad batch working fluid, the refining agent is DM1346F, and the dosage is 5-10g / L; The dosage of the hydrogen peroxide is 35% hydrogen peroxide 3-5g / L; The low temperature bleaching activator is NOBS, and the dosage is 0.5-1g / L; The dosage of NaOH is 10-20 g / L.

6. The cotton fabric pretreatment auxiliary system according to claim 2, characterized in that: The reagent B is added into water to form a padding working solution; Wherein, the dosage of cellulose protective agent is 1%-2% (owf); The dosage of penetrant is 1-2g / L.

7. A cotton fabric ozone pretreatment process, using the pretreatment auxiliary agent system according to any one of claims 1 to 6, characterized in that: The ozone pretreatment process includes a cold padding process and a padding process.

8. The cotton fabric ozone pretreatment process according to claim 7, characterized in that: The cold pad-batch process is to place the cotton fabric in a working solution containing reagent A, pad it in a padding tank, and after padding, pile it up to obtain the cotton fabric treated by the cold pad-batch process; The stacking time is 10-48h.

9. The ozone pretreatment process for cotton fabric according to claim 7, characterized in that: The padding process is to place the cotton fabric treated by the cold pad-batch process in a working solution containing reagent B and perform padding to obtain the cotton fabric treated by the padding process; In the padding process, the rolling rate of the padding working solution is 60%-120%.

10. The ozone pretreatment process for cotton fabric according to any one of claims 8 to 9, characterized in that: The cotton fabric treated by the padding process is pre-treated with ozone; The ozone pretreatment is to place the cotton fabric treated by the padding process in a box filled with ozone gas for pretreatment, and after the pretreatment, wash and dry the fabric; The process conditions of the ozone treatment in the box are: ozone flow rate 2-3L / min, ozone concentration 50-100mg / L, box temperature 20-40°C, and treatment time 2-5min.