CN111379159B - Hydrogen peroxide catalytic system based on polycarboxylic acid or anhydride compound and application of hydrogen peroxide catalytic system in low-temperature pretreatment of textiles - Google Patents
Hydrogen peroxide catalytic system based on polycarboxylic acid or anhydride compound and application of hydrogen peroxide catalytic system in low-temperature pretreatment of textiles Download PDFInfo
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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
- D06L4/13—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen using inorganic agents
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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
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Abstract
The invention belongs to the field of textile dyeing and finishing processing, and particularly relates to a hydrogen peroxide catalytic system based on polycarboxylic acid or anhydride compounds and application thereof in low-temperature pretreatment of textiles, wherein a low-temperature scouring and bleaching auxiliary agent containing polycarboxylic acid or anhydride compounds is added into an alkaline hydrogen peroxide system, and the textiles such as cotton-containing knitted fabrics, yarns, fibers and woven fabrics are pretreated (desizing, scouring and bleaching) at the temperature of 60-80 ℃; or the pretreatment of other various fiber textiles, including knitted fabrics, yarns, fibers and woven fabrics; it is also suitable for any oxidation and depurating process of chemical wet processing, including paper bleaching, wood or veneer bleaching, animal fur bleaching, etc. The process of the invention reduces the traditional fabric pretreatment temperature from 95-100 ℃ to 60-80 ℃ and below, greatly reduces the production energy consumption, has good treatment effect and has good popularization value.
Description
Technical Field
The invention belongs to the field of textile dyeing and finishing processing, and mainly relates to a method for pretreating textiles such as cotton-containing knitted fabrics, yarns, fibers and woven fabrics (desizing, refining and bleaching) at 60-80 ℃ and below by using a polycarboxylic acid or anhydride compound as a hydrogen peroxide catalyst. Or pretreatment of other various fiber textiles (knitted fabrics, yarns, fibers and woven fabrics). The catalytic system of the invention is also suitable for any oxidation and depuration process of chemical wet processing, including for example the bleaching of paper, the bleaching of wood or wood hides, the bleaching of animal skins, etc.
Background
The pretreatment (scouring and bleaching) of cotton-containing knitted fabrics, yarns and loose fibers mostly adopts a batch alkaline hydrogen peroxide solution leaching process, and mainly aims to remove impurities in cotton fibers such as cotton wax, pectin, pigment, cotton seed hulls and the like. Because the decomposition rate of hydrogen peroxide at low temperature is very low, in order to improve the efficiency, a high-temperature (95-100 ℃ or even 120-130 ℃) hydrogen peroxide treatment process is generally adopted, a large amount of water and steam are consumed, and the production and processing process is high in pollution and energy consumption.
The pretreatment (desizing, scouring and bleaching) processing of cotton-containing fabrics is a production and processing process with high pollution and high energy consumption, the traditional alkali boiling-oxygen bleaching high-temperature steaming (95-100 ℃) pretreatment process is mostly adopted at present, a large amount of water and energy are consumed, the wastewater not only has strong alkalinity and deep chroma and COD value of more than 20,000ppm, but also contains polyvinyl alcohol (PVA) pulp, and the biochemical property (BOD/COD) is poor. In order to reduce the COD value and the caustic soda consumption, a pretreatment process of biological enzyme treatment-oxygen bleaching is adopted, but the process has low desizing rate and poor capillary effect of the treated fabric, and a plurality of varieties cannot be suitable.
In the existing hydrogen peroxide low-temperature bleaching technology, the technology is mainly divided into two categories (high meson, application of hydrogen peroxide low-temperature oxidation catalyst in dyeing and finishing process, 16 th national printing and dyeing information exchange and new dyeing and finishing technology discussion, 2014.8, p.22-27): organic low-temperature bleaching activator bleaching systems and metal complex enzyme-like catalyst bleaching systems are mainly used in the household detergent industry and are gradually researched to be used for textile bleaching in recent years.
The organic low-temperature bleaching activator generally has an organic amide structure, and mainly comprises the following varieties: tetraacetylethylenediamine (TAED), nonanoylbenzene sulfonic acid sodium (NOBS), benzoyl caprolactam (TBCC) and the like (Wangtongning and the like, application of a hydrogen peroxide bleaching activator in cold-batch pretreatment of cotton fabrics, printing and dyeing, 2009, No.15, p.16-18). The hydrogen peroxide low-temperature activation pretreatment system mainly adopts organic low-temperature activators such as TAED and TBCC to effectively promote the removal of impurities contained on fibers at a lower temperature, and improves the whiteness, hand feeling, wettability and the like of textiles. The principle of the activator is that peroxy acid is generated, the oxidizing power of the peroxy acid is strong, bleaching can be carried out at low temperature, but organic acid is hydrolyzed to consume alkali along with the bleaching, the pH value of pretreatment is reduced to a neutral or even acidic range, decomposition of impurities is not facilitated, the removing power of cottonseed hulls is reduced, and therefore the activator is difficult to remove impurities such as the cottonseed hulls.
The enzyme-like catalyst has not reached the level of industrial application in the textile pretreatment process, and the enzyme-like catalyst refers to some chemical substances which are artificially or semi-artificially synthesized and have enzyme activity, and can catalyze the decomposition of hydrogen peroxide under the low-temperature condition to achieve the effect of low-temperature bleaching. The metal complex type enzyme-like catalyst bleaching system has better low-temperature bleaching promotion effect and becomes a more promising development direction. In recent years, the study of such metal mimetic enzyme systems as nitrogen-containing heterocyclic metal complexes, macrocyclic tetraaminoiron complexes, Schiff base (Salen) complexes, etc. has been advanced to some extent. However, the enzyme-like catalyst system has poor stability and safety and unstable chemical structure, so that the application of the enzyme-like catalyst system is limited.
Disclosure of Invention
The invention provides a hydrogen peroxide catalytic system based on polycarboxylic acid or anhydride compounds, which adopts the polycarboxylic acid or anhydride compounds as catalysts of hydrogen peroxide. Adding low-temperature scouring and bleaching auxiliary agent containing polycarboxylic acid or anhydride compound into alkaline hydrogen peroxide working solution, and performing low-temperature pretreatment (desizing, refining and bleaching) on textile such as cotton-containing knitted fabric, yarn, fiber and woven fabric at 60-80 ℃ or below. The catalytic system of the invention is also suitable for low-temperature pretreatment of other various fiber textiles, including low-temperature pretreatment of knitted fabrics, yarns, fibers and woven fabrics. Furthermore, the catalytic system of the invention is equally suitable for any oxidation and impurity removal process of chemical wet processing. Including paper bleaching, wood or veneer bleaching, animal fur bleaching, and the like.
The process can reduce the temperature of the traditional fabric pretreatment from 95-100 ℃ of the traditional process to 60-80 ℃ or below, greatly reduces the production energy consumption, and has the characteristics of low COD value of discharged wastewater and excellent treatment effect.
The technical scheme adopted by the invention is as follows:
the invention provides a hydrogen peroxide catalytic system working solution based on polycarboxylic acid or anhydride compounds, which comprises the following components: the concentration of 100% hydrogen peroxide is 2-20 g/L; the concentration of caustic soda is 2-12 g/L; the concentration of the low-temperature scouring and bleaching auxiliary agent containing polycarboxylic acid or anhydride compound is 2-10g/L, and the concentration of the oxygen bleaching scouring agent is 2-20 g/L.
The polycarboxylic acid or anhydride compound may include 1,2,4, 5-benzenetetracarboxylic anhydride/1, 2,4, 5-benzenetetracarboxylic acid, 1,2,3, 4-butanetetracarboxylic dianhydride/1, 2,3, 4-butanetetracarboxylic acid, 1,2,3, 4-cyclobutanetetracarboxylic dianhydride/1, 2,3, 4-cyclobutanetetracarboxylic acid, 1,2,3, 4-cyclopentanetetracarboxylic dianhydride/1, 2,3, 4-cyclopentanetetracarboxylic acid, and 3,3 ', 4, 4' -biphenyltetracarboxylic dianhydride/3, 3 ', 4, 4' -biphenyltetracarboxylic acid, etc.
The low-temperature scouring and bleaching auxiliary agent is one or more of polycarboxylic acid or anhydride compounds, lauryl alcohol polyoxyethylene ether and alkyl glycoside in a ratio of 4: 4: 2 in mass ratio.
The oxygen bleaching scouring agent may be any commercially available pretreatment scouring agent, for example FORTH MAG and 88-ECO of Kekey chemical, URATOS SFB of Xinrui Bie company, and the like.
The invention also provides a low-temperature pretreatment process for textiles, which is used for carrying out low-temperature pretreatment on the textiles by adopting the working solution of the hydrogen peroxide catalytic system based on the polycarboxylic acid or the anhydride compound.
The low-temperature pretreatment method comprises the steps of adding the low-temperature scouring and bleaching auxiliary agent containing polycarboxylic acid or anhydride compounds into an alkaline hydrogen peroxide system, catalyzing hydrogen peroxide to decompose at low temperature, and carrying out scouring bleaching or desizing scouring bleaching low-temperature pretreatment on the textile at the temperature of 60-80 ℃ or below.
The textile includes cotton-containing knitted fabrics, yarns, fibers and woven fabrics, and also includes other various fiber textiles (knitted fabrics, yarns, fibers and woven fabrics).
When the low-temperature pretreatment of the textile such as cotton-containing knitted fabric, yarn and fiber uses a dip bleaching process, the treatment temperature is 60-80 ℃, the treatment time is 45-90 minutes, and the bath ratio is 10-20: 1. When the grey cloth containing cotton woven fabrics adopts the rolling and steaming process, the treatment temperature is 60-80 ℃, and the treatment time is 45-60 minutes.
The cotton-containing knitted fabrics, yarns, loose fibers or woven fabrics are subjected to scouring bleaching or desizing scouring bleaching pretreatment, so that the steam consumption can be greatly reduced, and the fibers have high whiteness, small damage, soft hand feeling and low COD discharge. The bleaching system of the invention is stable, and the pH value of the system is always maintained in the initial level and strong alkaline range.
The hydrogen peroxide catalytic system based on the polycarboxylic acid or anhydride compound provided by the invention is also suitable for any oxidation and impurity removal processing process of chemical wet processing. Including paper bleaching, wood or veneer bleaching, animal fur bleaching, and the like.
Advantageous effects
The invention provides a hydrogen peroxide catalytic system based on polycarboxylic acid or anhydride compounds, which adopts the polycarboxylic acid or anhydride compounds to catalyze an alkaline hydrogen peroxide system, can adopt a soaking and bleaching mode for cotton-containing knitted fabrics, yarns and loose fibers, can adopt a rolling and steaming process for gray fabrics containing cotton machines, has the treatment temperature of 60-80 ℃ and below, greatly reduces the steam consumption compared with the high-temperature soaking and bleaching (98-100 ℃ or even 120-130 ℃ high temperature and high pressure) and high-temperature steaming (98-100 ℃) of the traditional process, and has the advantages of high fiber whiteness, good hygroscopicity, small damage, soft hand feeling and low COD (chemical oxygen demand) emission value.
The polycarboxylic acid or anhydride compound is used as a hydrogen peroxide catalyst and added into an alkaline hydrogen peroxide system, can catalyze hydrogen peroxide to decompose at low temperature, and can effectively decompose and degrade impurities on textiles such as cotton wax, pectin, pigment, cotton seed hulls, sizing agent and the like at the temperature of 60-80 ℃. And the pH value of the bleaching system is always maintained at an initial level (the pH values at the beginning and the end of bleaching are maintained at the same level), the pH value is maintained in an alkaline range, impurities can be efficiently removed, the treatment effect is good, the production energy consumption is greatly reduced, and the method has a good popularization value.
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Detailed Description
The present invention is further described below with reference to examples, but is not limited thereto.
Example 1 (all-cotton knitted fabric, gauge: 180 g/m) 2 )
(1) Preparation of bleaching working solution
The bath ratio is 20:1, hydrogen peroxide is 2g/L, caustic soda is 2g/L, a low-temperature scouring and bleaching auxiliary agent is 2g/L (a mixture of 1,2,4, 5-pyromellitic anhydride and 1,2,4, 5-pyromellitic acid in a mass ratio of 1: 1, polyalcohol polyoxyethylene ether and alkyl glycoside in a mass ratio of 4: 4: 2), and an oxygen bleaching scouring agent is 2g/L (88-ECO)
(2) Low-temperature pretreatment of all-cotton knitted fabric (scouring and bleaching)
And (4) soaking and bleaching for 60 minutes at 70 ℃, washing, dehydrating and drying.
The whiteness of the fabric is 65.89 percent, the capillary effect is 15.1cm (30 minutes), and the strength loss rate is 7.7 percent.
Influence of oxygen bleaching catalyst on decomposition rate of hydrogen peroxide and concentration of hydroxyl radical in system
The decomposition rate of the hydrogen peroxide at low temperature is very low, and the effective impurity removal and bleaching of the textile are difficult to carry out. When the catalyst (polycarboxylic acid or anhydride compound) is added into a hydrogen peroxide system, the catalyst can catalyze the hydrogen peroxide to decompose at low temperature, and can effectively decompose and degrade slurry and other impurities contained on the textile such as cotton wax, pectin, pigment, cotton seed hulls and the like at the temperature of 60-80 ℃, so that the textile can be subjected to low-temperature desizing, refining and bleaching treatment. The invention tests the hydrogen peroxide decomposition rate of the low-temperature scouring and bleaching auxiliary agent solution with 1,2,4, 5-benzenetetracarboxylic anhydride as an effective component at 70 ℃, and the result is shown in table 1.
TABLE 1 influence of Low-temperature scouring and bleaching auxiliary on decomposition rate of hydrogen peroxide and pH value variation of bleaching system
Preparing a hydrogen peroxide solution (6g/L), adding a low-temperature scouring and bleaching assistant (5 g/L is not added to a blank sample), adjusting the pH value to about 12 by using sodium hydroxide, stirring, keeping the temperature at 70 ℃, respectively taking 10mL of the mixture in a 200mL conical flask at 30 min and 60 min, adding 10mL of a 3mol/L sulfuric acid solution, shaking uniformly, and titrating by using potassium permanganate (0.584N); the blank was titrated simultaneously.
The calculation formula of the hydrogen peroxide decomposition rate (W) is as follows:
W＝(V 0 –V t )*100％/V 0
wherein, V 0 The volume of potassium permanganate solution consumed by hydrogen peroxide solution of a blank sample is V t Is the volume of potassium permanganate solution consumed by the hydrogen peroxide solution at time t.
As can be seen from Table 1, at a low temperature of 70 ℃, compared with a blank sample without the low-temperature scouring and bleaching aid, the hydrogen peroxide decomposition rate of the sample with the low-temperature scouring and bleaching aid is improved by more than one time to 75.4 percent at 60 minutes, and the pH value of the bleaching solution is always in a strong alkaline state (the pH value is 11.63 at the end point of bleaching at 60 minutes), so that the low-temperature scouring and bleaching aid with 1,2,4, 5-benzenetetracarboxylic anhydride as an effective component has the capability of catalyzing the decomposition of hydrogen peroxide.
Meanwhile, the fluorescence intensity of hydroxyl radicals in a 1,2,4, 5-benzenetetracarboxylic anhydride/hydrogen peroxide system is tested, and the result is shown in table 2.
TABLE 21, 2,4, 5-benzenetetracarboxylic anhydride/Hydrogen peroxide systems for the detection of the production of hydroxyl radicals (HO.)
Will H 2 O 2 (3.4×10 –4 mol/L) and 1,2,4, 5-benzenetetracarboxylic anhydride (4.6X 10) –4 mol/L) is added into a probe containing hydroxyl radical, namely, benzene pentacarboxylic acid (4.0 multiplied by 10) -4 mol/L), the reaction was kept at 70 ℃ for 1 hour with adjusting the pH of the reaction to 12 with sodium hydroxide, cooled to room temperature and tested. And (3) testing conditions are as follows: the fluorescence spectrum is scanned at a scanning speed of 1200 nm/min, and an emission excitation slit of 5nm, a PMT voltage of 400V, an excitation wavelength of 311nm and a response time of 0.5s are set. The test was performed using a fluorescence spectrophotometer model Hitachi F-7000.
As can be seen from Table 2, 1,2,4, 5-benzenetetracarboxylic anhydride produced more hydroxyl radicals under basic conditions in the sample with 1,2,4, 5-benzenetetracarboxylic anhydride than in the blank without 1,2,4, 5-benzenetetracarboxylic anhydride. The 1,2,4, 5-benzenetetracarboxylic anhydride is added to greatly promote the decomposition of hydrogen peroxide and generate more high-activity hydroxyl free radicals, and the effects of catalyzing the decomposition of hydrogen peroxide and efficiently catalyzing the degradation and removal of impurities are achieved.
Example 2 (pure cotton woven fabric, specification: 40 × 40/133 × 72)
(1) Preparing bleaching working solution
20g/L of hydrogen peroxide, 12g/L of caustic soda, 10g/L of low-temperature scouring and bleaching auxiliary agent (a mixture of 1,2,4, 5-pyromellitic anhydride, polyhydric alcohol polyoxyethylene ether and alkyl glucoside in a mass ratio of 4: 4: 2), and 20g/L of oxygen bleaching scouring agent (88-ECO).
(2) Cotton machine fabric pretreatment (desizing scouring bleaching)
Soaking the fabric twice in the working solution twice, rolling the fabric twice, steaming the fabric for 60 minutes at 70 ℃ with the liquid carrying rate of 100 wt%, washing the fabric with water, and drying the fabric.
The whiteness of the fabric is 69.32, the capillary effect is 8.5cm (30 minutes), the starch desizing rate is 6 grade, the PVA desizing rate is 5 grade, and the strength loss rate is 10.9 percent.
Example 3 (all-cotton knitted fabric, gauge: 180 g/m) 2 )
(1) Preparing bleaching working solution
The bath ratio is 15:1, 6g/L of hydrogen peroxide, 8g/L of caustic soda, 5g/L of low-temperature scouring and bleaching auxiliary agent (a mixture of 1,2,3, 4-butane tetracarboxylic acid/1, 2,3, 4-butane tetracarboxylic dianhydride and polyhydric alcohol polyoxyethylene ether and alkyl glycoside in a mass ratio of 1: 1 and 4: 4: 2), and 10g/L of oxygen bleaching scouring agent (88-ECO)
(2) Low-temperature pretreatment of cotton knitted fabric (scouring and bleaching)
And (4) carrying out dip bleaching for 45 minutes at 80 ℃, washing, dehydrating and drying.
The whiteness of the fabric is 70.40, the capillary effect is 15.6cm (30 minutes), and the strength loss rate is 9.8 percent.
Example 4 (all-cotton cheese, size: 60S/2)
(1) Preparation of bleaching working solution
The bath ratio is 18:1, hydrogen peroxide is 4g/L, caustic soda is 6g/L, a low-temperature scouring and bleaching auxiliary agent is 4g/L (a mixture of 1,2,4, 5-benzenetetracarboxylic anhydride, 1,2,3, 4-cyclobutane tetracarboxylic acid and polyhydric alcohol polyoxyethylene ether and alkyl glycoside in a mass ratio of 1: 1 and 4: 2), and an oxygen bleaching scouring agent URATOS SFB is 12 g/L;
(2) refining and bleaching treatment of cotton cheese
Keeping the temperature at 60 ℃ for 90 minutes, washing, dehydrating and drying.
The whiteness of the fabric is 66.40, the capillary effect is 15.3cm (30 minutes), and the strength loss is 8.4 percent.
Example 5 (polyester/cotton woven fabrics, size: 40 × 40/120 × 80)
(1) Preparation of bleaching working solution
15g/L of hydrogen peroxide, 6g/L of caustic soda, 4g/L of low-temperature scouring and bleaching auxiliary agent (a mixture of 1,2,4, 5-benzenetetracarboxylic anhydride, 1,2,3, 4-cyclobutane tetracarboxylic dianhydride and polyhydric alcohol polyoxyethylene ether and alkyl glycoside in a mass ratio of 1: 1 to 4: 2), and 10g/L of oxygen bleaching scouring agent URATOS SFB.
(2) Low-temperature pretreatment of polyester/cotton machine fabric (desizing, scouring and bleaching)
Soaking the fabric twice in the working solution twice, rolling the fabric twice, steaming the fabric for 60 minutes at 75 ℃, washing and drying the fabric, wherein the liquid carrying rate is 90 wt%.
The fabric whiteness is 69.87, the capillary effect is 8.0cm (30 minutes), the starch desizing rate is grade 6, the PVA desizing rate is grade 5, and the strength loss rate is 10.8%.
Example 6 (Cotton Loose fiber, Xinjiang long staple cotton)
(1) Preparation of bleaching working solution
The bath ratio is 10:1, the hydrogen peroxide is 3g/L, the caustic soda is 6g/L, the low-temperature scouring and bleaching auxiliary agent is 5g/L (a mixture of 3,3 ', 4, 4' -biphenyl tetracarboxylic dianhydride and 3,3 ', 4, 4' -biphenyl tetracarboxylic dianhydride in a mass ratio of 1: 1 and polyhydric alcohol polyoxyethylene ether and alkyl glycoside in a mass ratio of 4: 4: 2), and the oxygen bleaching refining agent is 88-ECO 10 g/L.
(2) Scouring and bleaching treatment of cotton fiber
Keeping the temperature at 60 ℃ for 90 minutes, washing, dehydrating and drying.
Whiteness 67.79, wettability (instantaneous fuzz effect) of less than 1 second. The strength loss was 7.9%.
Example 7 (all-cotton woven fabric, Standard: 40X 40/133X 72)
(1) Preparation of bleaching working solution
18g/L of hydrogen peroxide, 10g/L of caustic soda, 8g/L of low-temperature scouring and bleaching auxiliary agent (a mixture of 1,2,4, 5-benzenetetracarboxylic anhydride, 1,2,3, 4-cyclopentanetetracarboxylic acid and polyalcohol polyoxyethylene ether and alkyl glycoside in a mass ratio of 1: 1 to 4: 2), and 18g/L of oxygen bleaching scouring agent FORTH MAG;
(2) pretreatment of all-cotton woven fabric (desizing, scouring and bleaching)
Soaking the fabric twice in the working solution twice, rolling the fabric twice, steaming the fabric for 50 minutes at 70 ℃, washing and drying the fabric, wherein the liquid carrying rate is 100 wt%.
The whiteness of the fabric is 68.72, the capillary effect is 8.0cm (30 minutes), the starch desizing rate is grade 6, the PVA desizing rate is grade 5, and the strength loss rate is 10.9%.
Example 8 (all-cotton woven fabric, specification: 40 × 40/133 × 72)
(1) Preparing bleaching working solution
15g/L of hydrogen peroxide, 10g/L of caustic soda, 6g/L of low-temperature scouring and bleaching auxiliary agent (a mixture of 1,2,4, 5-benzenetetracarboxylic anhydride, 1,2,3, 4-cyclopentanetetracarboxylic dianhydride and polyhydric alcohol polyoxyethylene ether in a mass ratio of 1: 1, and alkyl glycoside in a mass ratio of 4: 4: 2), and 16g/L of oxygen bleaching scouring agent FORTH MAG;
(2) cotton machine fabric pretreatment (desizing, scouring and bleaching)
Soaking the fabric twice in the working solution twice, rolling the fabric twice, steaming the fabric for 60 minutes at 70 ℃ with the liquid carrying rate of 100 wt%, washing the fabric with water, and drying the fabric.
The whiteness of the fabric is 68.27, the capillary effect is 7.8cm (30 minutes), the starch desizing rate is 6 grade, the PVA desizing rate is 4 grade, and the strength loss rate is 10.2 percent.
Comparative example 1 (comparative example 2) (pure cotton woven fabric specification: 40 × 40/133 × 72) without the addition of a Low-temperature scouring and bleaching aid
(1) Preparation of bleaching working solution
20g/L of hydrogen peroxide, 12g/L of caustic soda and 20g/L of oxygen bleaching scouring agent (88-ECO)
(2) Pretreatment of cotton machine fabric (desizing, scouring and bleaching)
Soaking the fabric twice in the working solution twice, rolling the fabric twice, steaming the fabric for 60 minutes at 70 ℃ with the liquid carrying rate of 100 wt%, washing the fabric with water, and drying the fabric.
The whiteness of the fabric is 69.70, the capillary effect is 4.5cm (30 minutes), the desizing rate of starch is 3 grade, the desizing rate of PVA is 3 grade, and the strength loss rate is 18.5 percent.
Comparative example 2 (comparative example 3) (all-cotton knitted fabric, gauge: 180g/m 2 ) High temperature treatment by conventional process
(1) Preparing bleaching working solution
The bath ratio is 15:1, 6g/L of hydrogen peroxide, 8g/L of caustic soda, 5/5 g of URATOS STA as an oxygen bleaching stabilizer and 10g/L of 88-ECO as an oxygen bleaching scouring agent.
(2) High-temperature pretreatment of pure cotton knitted fabric (scouring and bleaching)
And (3) soaking and bleaching for 60 minutes at 98 ℃, washing, dehydrating and drying.
The whiteness of the fabric is 70.23, the capillary effect is 15.1cm (30 minutes), and the strength loss rate is 18.3 percent.
Comparative example 3 (comparative example 7) (pure cotton woven fabric, gauge: 40 × 40/133 × 72), switched to: nonoylbenzenesulfonic acid sodium salt (NOBS)
(1) Preparing bleaching working solution
Hydrogen peroxide 18g/L, caustic soda 10g/L, nonanoyl benzene sodium sulfonate (NOBS)8g/L and oxygen bleaching scouring agent 88-ECO 18 g/L;
(2) desizing, refining and bleaching treatment of cotton machine fabric
Soaking the fabric twice in the working solution twice, rolling the fabric twice, steaming the fabric for 50 minutes at 70 ℃, washing and drying the fabric, wherein the liquid carrying rate is 100 wt%.
The whiteness of the fabric is 68.66, the capillary effect is 4.5cm (30 minutes), the desizing rate of starch is 3 grade, the desizing rate of PVA is 3 grade, and the strength loss rate is 18.6 percent.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any obvious modifications, substitutions or variations can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (7)
1. A hydrogen peroxide catalytic system based on polycarboxylic acid or anhydride compounds is characterized in that: the catalytic system working solution comprises the following components: the concentration of 100% hydrogen peroxide is 2-20 g/L; the concentration of caustic soda is 2-12 g/L; the concentration of the low-temperature scouring and bleaching assistant containing polycarboxylic acid or anhydride compound is 2-10g/L, and the concentration of the oxygen bleaching scouring agent is 2-20 g/L;
the low-temperature scouring and bleaching auxiliary agent is one or more of polycarboxylic acid or anhydride compounds, lauryl alcohol polyoxyethylene ether and alkyl glucoside, wherein the weight ratio of the polycarboxylic acid or anhydride compounds to the lauryl alcohol polyoxyethylene ether to the alkyl glucoside is 4: 4: 2 in a mass ratio;
the polycarboxylic acid or anhydride compound in the hydrogen peroxide catalytic system comprises 1,2,4, 5-benzenetetracarboxylic anhydride/1, 2,4, 5-benzenetetracarboxylic acid, 1,2,3, 4-butanetetracarboxylic dianhydride/1, 2,3, 4-butanetetracarboxylic acid, 1,2,3, 4-cyclobutanetetracarboxylic dianhydride/1, 2,3, 4-cyclobutanetetracarboxylic acid, 1,2,3, 4-cyclopentanetetracarboxylic dianhydride/1, 2,3, 4-cyclopentanetetracarboxylic acid, and 3,3 ', 4, 4' -biphenyltetracarboxylic dianhydride/3, 3 ', 4, 4' -biphenyltetracarboxylic acid.
2. A hydrogen peroxide catalytic system based on polycarboxylic acid or anhydride compounds according to claim 1, characterized in that the oxygen bleaching scouring agent is a commercial pretreatment scouring agent.
3. A low-temperature pretreatment method for textiles is characterized in that the low-temperature pretreatment is carried out on the textiles by adopting the working solution of the hydrogen peroxide catalytic system based on the polycarboxylic acid or the anhydride compound as claimed in claim 1.
4. The low-temperature pretreatment method for the textiles according to claim 3, wherein the low-temperature pretreatment method is to carry out pretreatment on the textiles by using a hydrogen peroxide catalytic system working solution based on polycarboxylic acid or anhydride compounds, and carry out low-temperature pretreatment on the textiles at a temperature of 60-80 ℃ or below.
5. The low-temperature pretreatment method for the textile according to claim 3, wherein the textile is a cotton-containing knitted fabric, a cotton-containing woven fabric or a yarn.
6. The low-temperature pretreatment method of textiles according to claim 3, wherein when the low-temperature pretreatment of the cotton-containing knitted fabrics, yarns and fibers uses a dip bleaching process, the treatment temperature is 60-80 ℃, the treatment time is 45-90 minutes, and the bath ratio is 10-20: 1; when the rolling and steaming process is adopted for the cotton containing fabric, the liquid carrying rate is 90-100%, the processing temperature is 60-80 ℃, and the processing time is 45-60 minutes.
7. Use of a catalytic system for hydrogen peroxide based on polycarboxylic acid or anhydride compounds according to claim 1, characterized in that it is suitable for any oxidation and depuration process of chemical wet processing.
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