CN114000356A - Cotton knitted fabric pretreatment process adopting alkali-resistant phosphorus-free chelating agent - Google Patents
Cotton knitted fabric pretreatment process adopting alkali-resistant phosphorus-free chelating agent Download PDFInfo
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- CN114000356A CN114000356A CN202111271608.4A CN202111271608A CN114000356A CN 114000356 A CN114000356 A CN 114000356A CN 202111271608 A CN202111271608 A CN 202111271608A CN 114000356 A CN114000356 A CN 114000356A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M23/00—Treatment of fibres, threads, yarns, fabrics or fibrous goods made from such materials, characterised by the process
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
- D06L1/12—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents
- D06L1/16—Multi-step processes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
- D06L4/12—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen combined with specific additives
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
- D06L4/13—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen using inorganic agents
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
Abstract
The invention discloses a cotton knitted fabric pretreatment process adopting an alkali-resistant phosphorus-free chelating agent, which comprises the steps of heating a water environment to 50 ℃ in advance, adding a refined deoiling agent at a concentration of 1-2 g/L per 100g of all-cotton gray fabric, adding an alkali-resistant phosphorus-free chelating agent at a concentration of 0.5-2g/L per 100g of all-cotton gray fabric, adding caustic soda flakes and hydrogen peroxide after uniform dispersion, then performing overflow operation treatment on the all-cotton gray fabric by adopting an overflow dyeing machine, and immersing the pretreated all-cotton gray fabric into the water environment after water change for subsequent dyeing.
Description
Technical Field
The invention relates to a cotton cloth treatment process, in particular to a cotton knitted fabric pretreatment process adopting an alkali-resistant phosphorus-free chelating agent.
Background
With the rapid development of science and technology, environmental pollution threatens the ecological balance and endangers the living environment of human beings, and the serious problem has attracted extensive attention of all countries in the world and taken measures to make corresponding regulations in hope of preventing further deterioration of ecology. Textile ecolabels and environmental regulations have been developed for textile countries in succession, for example: Oeko-Tex100, ISO14000 series standard, etc. The influence of the textile on the environment is far more than that of the textile, so that for printing and dyeing enterprises, the good selection of the printing and dyeing auxiliary brings product quality to the enterprises, reduces the three-waste treatment cost for the enterprises, more importantly brings progress and health to the society and human beings, and for auxiliary research and production units, the research and production of the environment-friendly textile auxiliary is responsibility and obligation of the enterprises, and is not only related to the sales and profits of the products, but also related to the survival and development of the units and the progress and development of the society. The main impact of the printing and dyeing auxiliaries on the environment is their safety and biodegradability. Wherein the safety is the primary consideration of whether the product can be put into production, and comprises acute and chronic toxicity, carcinogenicity, irritation to skin, teratogenicity, denaturation, toxicity to aquatic organisms, physiological effect and the like; biodegradability is widely regarded, and printing and dyeing auxiliaries with poor biodegradability can accumulate, so that the environment is seriously affected. The main product of the commercially available chelating dispersion stabilizer is organic phosphonate products containing phosphorus, the chelating dispersion stabilizer has the characteristics of strong chelating capacity, excellent dispersion performance and the like, but the chelating dispersant is mainly obtained by reacting amine compounds with formaldehyde and phosphorus pentoxide in the synthesis process, or is formed by reacting phosphorus trichloride with acetic acid or acetic anhydride. Although phosphorus pentoxide and phosphorus trichloride are not toxic products, the phosphorus pentoxide and phosphorus trichloride are dangerous goods, and unsafe factors exist in the transportation and use processes of the phosphorus pentoxide and the phosphorus trichloride. The product prepared by the reaction of the amine compound, formaldehyde and phosphorus pentoxide has the pollution of unreacted formaldehyde to the environment, and the reaction of phosphorus trichloride and acetic acid or acetic anhydride has high requirements on the corrosion resistance and the tightness of equipment. Meanwhile, the product also causes 'eutrophication' in water areas after being discharged along with printing and dyeing wastewater and flowing into rivers and lakes, so that algae are excessively bred, the oxygen content in water is reduced, aquatic animals are suffocated and killed, and the ecological imbalance of aquatic organisms is caused. In addition, the chelating dispersant has poor alkali resistance and cannot be used in a one-bath desizing and bleaching one-bath method under high-alkali conditions.
The chelating dispersants commonly used in modern dye houses are: aminotrimethylene phosphonic acid, ATMP,: phosphorus-containing chelating dispersants such as sodium trimetaphosphate and sodium hydroxyethylidene diphosphonate. The chelating dispersant with phosphorus structure has no influence on its chelating capacity at high temperature and alkali condition. After boiling off and adding in oxygen bleaching, the obtained grey cloth has good performance (whiteness and capillary effect). The disadvantages are as follows: the produced sewage contains a large amount of P, is difficult to remove and has limited sewage discharge. Greatly improving the sewage treatment cost of enterprises.
In order to solve the pollution problem, a common solution in the market at present is a chelating dispersant obtained by adopting an acrylic acid/maleic anhydride copolymer, but the chelating dispersant loses the chelating effect under high-temperature and high-alkaline conditions, the chelating capacity is reduced sharply, and the chelating capacity cannot be improved even if the using amount of a common Malalon chelating dispersant is increased.
The full-cotton grey cloth needs to be subjected to processes such as scouring and oxygen bleaching before dyeing to remove pectin, oily wax, nitrogen-containing substances, other impurities and the like wrapped on cotton fibers, and the woven cloth belongs to a high-count and high-density type and is easy to wrinkle and crease, so that a factory car is generally selected for dyeing, and knitted cloth is easy to curl when used on a long car, so that an overflow dyeing machine is selected, and an adaptive cotton knitted cloth treatment process is needed for adapting to an alkali-resistant phosphorus-free chelating agent.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a cotton knitted fabric pretreatment process adopting an alkali-resistant phosphorus-free chelating agent aiming at the defects of the prior art.
The technical scheme is as follows: the invention relates to a cotton knitted fabric pretreatment process adopting an alkali-resistant phosphorus-free chelating agent, which comprises the following steps:
s1, after heating the water environment to 50 ℃, adding a refined deoiling agent at a concentration of 1-2 g/L per 100g of all-cotton gray cloth, adding an alkali-resistant phosphorus-free chelating agent at a concentration of 0.5-2g/L per 100g of all-cotton gray cloth, continuously heating for 3min and stirring to uniformly disperse the refined deoiling agent and the alkali-resistant phosphorus-free chelating agent;
s2, after dispersing and homogenizing the refined degreaser and the alkali-resistant phosphorus-free chelating agent, introducing the all-cotton gray cloth into a water environment, soaking for 15min, and then continuously stirring for 3 min;
s3, carrying out overflow operation treatment on the all-cotton gray cloth treated by the S2;
and S4, after the overflow operation is finished, carrying out post-stabilization treatment on the all-cotton gray cloth, and then finishing the overflow operation pretreatment on the all-cotton gray cloth.
Preferably, the method comprises the following steps:
s1, after heating the water environment to 50 ℃, adding a refined deoiling agent at a concentration of 1-2 g/L per 100g of all-cotton gray cloth, adding an alkali-resistant phosphorus-free chelating agent at a concentration of 0.5-2g/L per 100g of all-cotton gray cloth, continuously heating for 3min and stirring to uniformly disperse the refined deoiling agent and the alkali-resistant phosphorus-free chelating agent;
s2, after dispersing and homogenizing the refined degreaser and the alkali-resistant phosphorus-free chelating agent, introducing the all-cotton gray cloth into a water environment, soaking for 15min, and then continuously stirring for 3 min;
s3, adding caustic soda flakes, stirring for 3min at a constant temperature, adding hydrogen peroxide, stirring for 3min at a constant temperature, heating to 98 ℃ at a speed of 3.5 ℃/min, keeping the temperature for 30min, cooling to 65 ℃ at a speed of 1 ℃/min, performing overflow operation, continuously draining for 5min, and continuously cooling to 45 ℃;
after the water is drained and the temperature is reduced in S4 and S3, water is fed, acetic acid is added, the mixture is heated to 50 ℃, continuously soaked for 10min, cooled to 45 ℃ and drained;
s5, feeding water again, adding enzyme, heating to 50 ℃, and standing for 15 min;
and S6, repeating the water inlet and drainage operations until the pretreatment is finished.
Preferably, the repeated water feeding and draining operation in S6 includes water feeding and soaking for 10min in S5, draining, water feeding and soaking for 8min, draining, and finishing the pretreatment of the cotton greige cloth and putting the cotton greige cloth into a state to be dyed.
Preferably, the caustic soda flakes are added into S3 at a concentration of 1-3 g/L per 100g of all-cotton gray cloth.
Preferably, in S3, 27.5% hydrogen peroxide is added in a concentration of 0.5-12 g/L per 100g of all-cotton gray cloth, and a hydrogen peroxide stabilizer is added in a concentration of 0.5-2g/L per 100g of all-cotton gray cloth.
Preferably, the method comprises the following steps:
s1, after heating the water environment to 50 ℃, adding a refined deoiling agent at a concentration of 1-2 g/L per 100g of all-cotton gray cloth, adding an alkali-resistant phosphorus-free chelating agent at a concentration of 0.5-2g/L per 100g of all-cotton gray cloth, continuously heating for 3min and stirring to uniformly disperse the refined deoiling agent and the alkali-resistant phosphorus-free chelating agent;
s2, after dispersing and homogenizing the refined degreaser and the alkali-resistant phosphorus-free chelating agent, introducing the all-cotton gray cloth into a water environment, soaking for 15min, and then continuously stirring for 3 min;
s3, adding caustic soda flakes, keeping the temperature and stirring for 3min, heating to 98 ℃ at the speed of 4 ℃/min, keeping the temperature for 30min, then cooling to 65 ℃ at the speed of 3 ℃/min, performing overflow operation, continuously draining for 5min, and continuously cooling to 45 ℃;
after the water is drained and the temperature is reduced in S4 and S3, water is added, acetic acid is added, the temperature is heated to 50 ℃, and the mixture is continuously soaked for 10 min;
and S5, repeating the water inlet and drainage operations until the pretreatment is finished.
Preferably, the repeated water feeding and draining operation in S5 includes water feeding and soaking for 10min in S4, draining, water feeding and soaking for 8min, draining, and finishing the pretreatment of the cotton greige cloth and putting the cotton greige cloth into a state to be dyed.
Preferably, the caustic soda flake is added into S3 at a concentration of 3-5g/L per 100g of cotton-wool embryonic cloth.
Compared with the prior art, the invention has the following beneficial effects: the all-cotton grey cloth adopts the alkali-resistant phosphorus-free chelating agent to be matched with the overflow dyeing machine to be used as the pretreatment process of the cotton knitted cloth, does not influence the chelating capacity under the conditions of high temperature and alkalinity, does not contain phosphorus, and greatly reduces the subsequent sewage treatment difficulty and treatment cost
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
The invention provides a cotton knitted fabric pretreatment process adopting an alkali-resistant phosphorus-free chelating agent, in order to meet the requirement of subsequent dyeing in actual production, a scouring process is adopted for full cotton gray fabric if deep-colored fabric needs to be dyed subsequently, and an oxygen bleaching process is adopted for pretreatment if light-colored and bright-colored fabric needs to be dyed subsequently.
Example 1: a cotton knitted fabric pretreatment oxygen bleaching process adopting an alkali-resistant phosphorus-free chelating agent comprises the following steps:
s1, after heating the water environment to 50 ℃, adding a refined deoiling agent at a concentration of 1-2 g/L per 100g of all-cotton gray cloth, adding an alkali-resistant phosphorus-free chelating agent at a concentration of 0.5-2g/L per 100g of all-cotton gray cloth, continuously heating for 3min and stirring to uniformly disperse the refined deoiling agent and the alkali-resistant phosphorus-free chelating agent;
s2, after dispersing and homogenizing the refined degreaser and the alkali-resistant phosphorus-free chelating agent, introducing the all-cotton gray cloth into a water environment, soaking for 15min, and then continuously stirring for 3 min;
s3, adding caustic soda flakes at a concentration of 1-3 g/L per 100g of all-cotton gray cloth, stirring for 3min under heat preservation, adding 27.5% hydrogen peroxide at a concentration of 0.5-12 g/L per 100g of all-cotton gray cloth, adding a hydrogen peroxide stabilizer at a concentration of 0.5-2g/L per 100g of all-cotton gray cloth, stirring for 3min under heat preservation, heating to 98 ℃ at a speed of 3.5 ℃/min, keeping the temperature for 30min, cooling to 65 ℃ at a speed of 1 ℃/min, performing overflow operation, draining for 5min and continuously cooling to 45 ℃;
after the water is drained and the temperature is reduced in S4 and S3, water is fed, acetic acid is added, the mixture is heated to 50 ℃, continuously soaked for 10min, cooled to 45 ℃ and drained;
s5, feeding water again, adding enzyme, heating to 50 ℃, and standing for 15 min;
and (3) water is fed into the S6 and S5 and soaked for 10min and then drained, then water is fed for the second time and soaked for 8min and then drained, and finally water is fed to finish pretreatment and enable the all-cotton gray cloth to enter a state to be dyed.
Example 2: a pretreatment scouring process for cotton knitted fabric by adopting alkali-resistant phosphorus-free chelating agent comprises the following steps:
s1, after heating the water environment to 50 ℃, adding a refined deoiling agent at a concentration of 1-2 g/L per 100g of all-cotton gray cloth, adding an alkali-resistant phosphorus-free chelating agent at a concentration of 0.5-2g/L per 100g of all-cotton gray cloth, continuously heating for 3min and stirring to uniformly disperse the refined deoiling agent and the alkali-resistant phosphorus-free chelating agent;
s2, after dispersing and homogenizing the refined degreaser and the alkali-resistant phosphorus-free chelating agent, introducing the all-cotton gray cloth into a water environment, soaking for 15min, and then continuously stirring for 3 min;
s3, adding caustic soda flakes with the concentration of 3-5g/L per 100g of all-cotton gray cloth, keeping the temperature and stirring for 3min, heating to 98 ℃ at the speed of 4 ℃/min, keeping the temperature for 30min, then cooling to 65 ℃ at the speed of 3 ℃/min, performing overflow operation, continuously draining for 5min, and continuously cooling to 45 ℃;
after the water is drained and the temperature is reduced in S4 and S3, water is added, acetic acid is added, the temperature is heated to 50 ℃, and the mixture is continuously soaked for 10 min;
and S5, repeating the water inlet and drainage operation until the pretreatment is finished, wherein the repeated water inlet and drainage operation comprises the steps of water inlet and water drainage in S3 for 10min, water inlet and water soaking for 8min, water drainage, and water inlet for finishing the pretreatment and enabling the all-cotton gray cloth to enter a state to be dyed.
In addition, the chelating dispersant obtained from the common acrylic acid/maleic anhydride copolymer on the market is used for pretreating the cotton gray cloth to be used as a control group 1, the CP-5 is used for pretreating the cotton gray cloth to be used as a control group 2, and the capillary effect and the whiteness of the pretreated cotton gray cloth are tested.
And (3) determining the wool effect of the fabric: the cloth samples prepared in the examples 1 and 2 and the control groups 1 and 2 are taken, three cloth strips with the length of about 20cm and the width of about 3cm are respectively cut on four cloth samples along the weft direction, two small holes are cut at the lower ends of the cloth strips, a glass rod with the weight of about 3g is penetrated through the cloth strips, the cloth strips are vertically suspended in a stuffing steaming water tray which is just boiled and cooled, and a scale which is parallel to the cloth strips and is provided with centimeter scales is erected in the tray to calculate the rising height of the capillary tube. For convenient observation, 0.5 weight of potassium sodium chloride can be used to replace the stuffing steaming water, the time is recorded immediately when the cloth strips are immersed in the stuffing steaming water, the rising height is observed after 30 minutes and is calculated by centimeters, the number of the cloth strips is recorded to one decimal point, and the average value of the rising heights after 30 minutes of three cloth strips is taken as the gross effective value of the fabric.
The whiteness of the fabric is measured by a ZBD type whiteness meter, a plurality of layers of samples are required to be placed at the same time during measurement, the number of the layers depends on the transparency of the fabric, and the number of the layers is increased by a plurality of layers until the measured data is constant, and is generally not less than eight layers. Each sample is measured three times at different positions under the condition of keeping the warp and weft directions constant, and the arithmetic mean of the three times is the whiteness value of the fabric.
The sorting effect can be visually embodied through the data of the whiteness value and the capillary value.
Gross value test data are as follows:
| example 1 | 9.74cm |
| Example 2 | 10.12cm |
| Control group 1 | 15.71cm |
| Control group 2 | 14.42cm |
The whiteness value test data were as follows:
| example 1 | 91 |
| Example 2 | 89 |
| Control group 1 | 76 |
| Control group 2 | 79 |
As can be seen from the data of the hairiness value and the whiteness value, the finishing effect is remarkably improved compared with that of a chelating dispersant and a common finishing agent obtained by the traditional acrylic acid/maleic anhydride copolymer.
The particular features, structures, materials, or characteristics described in this disclosure may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A pretreatment process of cotton knitted fabric by adopting alkali-resistant phosphorus-free chelating agent is characterized in that: the method comprises the following steps:
s1, after heating the water environment to 50 ℃, adding a refined deoiling agent at a concentration of 1-2 g/L per 100g of all-cotton gray cloth, adding an alkali-resistant phosphorus-free chelating agent at a concentration of 0.5-2g/L per 100g of all-cotton gray cloth, continuously heating for 3min and stirring to uniformly disperse the refined deoiling agent and the alkali-resistant phosphorus-free chelating agent;
s2, after dispersing and homogenizing the refined degreaser and the alkali-resistant phosphorus-free chelating agent, introducing the all-cotton gray cloth into a water environment, soaking for 15min, and then continuously stirring for 3 min;
s3, carrying out overflow operation treatment on the all-cotton gray cloth treated by the S2;
and S4, after the overflow operation is finished, carrying out post-stabilization treatment on the all-cotton gray cloth, and then finishing the overflow operation pretreatment on the all-cotton gray cloth.
2. The pretreatment process of cotton knitted fabric using alkali-and phosphorus-resistant chelating agent as claimed in claim 1, wherein: the method comprises the following steps:
s1, after heating the water environment to 50 ℃, adding a refined deoiling agent at a concentration of 1-2 g/L per 100g of all-cotton gray cloth, adding an alkali-resistant phosphorus-free chelating agent at a concentration of 0.5-2g/L per 100g of all-cotton gray cloth, continuously heating for 3min and stirring to uniformly disperse the refined deoiling agent and the alkali-resistant phosphorus-free chelating agent;
s2, after dispersing and homogenizing the refined degreaser and the alkali-resistant phosphorus-free chelating agent, introducing the all-cotton gray cloth into a water environment, soaking for 15min, and then continuously stirring for 3 min;
s3, adding caustic soda flakes, stirring for 3min at a constant temperature, adding hydrogen peroxide, stirring for 3min at a constant temperature, heating to 98 ℃ at a speed of 3.5 ℃/min, keeping the temperature for 30min, cooling to 65 ℃ at a speed of 1 ℃/min, performing overflow operation, continuously draining for 5min, and continuously cooling to 45 ℃;
after the water is drained and the temperature is reduced in S4 and S3, water is fed, acetic acid is added, the mixture is heated to 50 ℃, continuously soaked for 10min, cooled to 45 ℃ and drained;
s5, feeding water again, adding enzyme, heating to 50 ℃, and standing for 15 min;
and S6, repeating the water inlet and drainage operations until the pretreatment is finished.
3. The pretreatment process of cotton knitted fabric using alkali-and phosphorus-resistant chelating agent as claimed in claim 2, wherein: the repeated water feeding and draining operation in the S6 comprises the steps of water feeding and water draining after soaking for 10min in the S5, water feeding for the second time and water draining after soaking for 8min, and finally water feeding to complete pretreatment and enable the all-cotton gray cloth to enter a state to be dyed.
4. The pretreatment process of cotton knitted fabric using alkali-and phosphorus-resistant chelating agent as claimed in claim 2, wherein: in S3, caustic soda flakes are added into every 100g of all-cotton gray cloth at a concentration of 1-3 g/L.
5. The pretreatment process of cotton knitted fabric using alkali-and phosphorus-resistant chelating agent as claimed in claim 2, wherein: in the S3, 27.5% hydrogen peroxide is added in a concentration of 0.5-12 g/L per 100g of all-cotton gray cloth, and a hydrogen peroxide stabilizer is added in a concentration of 0.5-2g/L per 100g of all-cotton gray cloth.
6. The pretreatment process of cotton knitted fabric with alkali-resistant and phosphorus-free chelating agent as claimed in claim 1, wherein: the method comprises the following steps:
s1, after heating the water environment to 50 ℃, adding a refined deoiling agent at a concentration of 1-2 g/L per 100g of all-cotton gray cloth, adding an alkali-resistant phosphorus-free chelating agent at a concentration of 0.5-2g/L per 100g of all-cotton gray cloth, continuously heating for 3min and stirring to uniformly disperse the refined deoiling agent and the alkali-resistant phosphorus-free chelating agent;
s2, after dispersing and homogenizing the refined degreaser and the alkali-resistant phosphorus-free chelating agent, introducing the all-cotton gray cloth into a water environment, soaking for 15min, and then continuously stirring for 3 min;
s3, adding caustic soda flakes, keeping the temperature and stirring for 3min, heating to 98 ℃ at the speed of 4 ℃/min, keeping the temperature for 30min, then cooling to 65 ℃ at the speed of 3 ℃/min, performing overflow operation, continuously draining for 5min, and continuously cooling to 45 ℃;
after the water is drained and the temperature is reduced in S4 and S3, water is added, acetic acid is added, the temperature is heated to 50 ℃, and the mixture is continuously soaked for 10 min;
and S5, repeating the water inlet and drainage operations until the pretreatment is finished.
7. The pretreatment process of cotton knitted fabric using alkali-and phosphorus-resistant chelating agent as claimed in claim 6, wherein: the repeated water feeding and draining operation in the S5 comprises the steps of water feeding and water draining after soaking for 10min in the S4, water feeding for the second time and water draining after soaking for 8min, and finally water feeding to complete pretreatment and enable the all-cotton gray cloth to enter a state to be dyed.
8. The pretreatment process of cotton knitted fabric using alkali-and phosphorus-resistant chelating agent as claimed in claim 7, wherein: the concentration of caustic soda flakes added into S3 is 3-5g/L per 100g of all-cotton gray cloth.
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