CN110804853A - Cotton fabric bleaching method using polyoxometallate - Google Patents
Cotton fabric bleaching method using polyoxometallate Download PDFInfo
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- CN110804853A CN110804853A CN201911109770.9A CN201911109770A CN110804853A CN 110804853 A CN110804853 A CN 110804853A CN 201911109770 A CN201911109770 A CN 201911109770A CN 110804853 A CN110804853 A CN 110804853A
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- cotton fabric
- bleaching
- bleaching method
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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
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Abstract
The invention belongs to the technical field of textile, and discloses a method for bleaching cotton fabric by polyoxometallate. Firstly, washing cotton fabric with diethyl ether and an acidic solution containing a chelating agent and having a pH value of 5-6 to remove grease and wax on the surface of the cotton fabric and incidental metal ions; and then soaking the glass fiber fabric in a bleaching solution containing polyoxometallate, hydrogen peroxide, a refining agent and a penetrating agent with the pH value of 6-12 for 10-40 min at the temperature of 30-70 ℃ in a bath ratio of 1 (5-30), adding sodium silicate, continuously treating for 10-30 min, taking out, washing and drying. The bleached cotton fabric provided by the invention avoids the problems that in the prior art, hydrogen peroxide is decomposed when bleaching is carried out under high-temperature and high-alkali conditions, so that the production cost is increased and the cotton fabric is oxidized and damaged, and has short required time and little environmental pollution.
Description
Technical Field
The invention relates to the technical field of textile, in particular to a method for bleaching cotton fabric by using polyoxometallate.
Background
Polyoxometalates (POMs) have found wide application as effective redox and acidic catalysts in a variety of organic syntheses. The polyoxometallate has the remarkable characteristics of high water solubility, high solubility in an oxygen-containing organic solvent, good stability and the like, has the properties of strong acid and high-efficiency oxidant, and has wide application prospect as a bifunctional catalyst in homogeneous and heterogeneous systems. As early as the middle of the 90's of the 20 th century, highly selective regenerable agents or catalysts POMs were proposed for pulp bleaching.
The cotton fiber can be polluted in the dyeing and finishing process because of the impurities such as natural pigment. The cotton fabric is bleached, so that the ideal whiteness is given, impurities can be removed, and the moisture absorption swelling property of the cotton can be improved. The trend in research and industry development of cotton fiber bleaching processes in recent years has been the gradual replacement of environmentally harmful chlorine-based bleaches with oxygen-based agents. The hydrogen peroxide bleaching process has the advantages of short processing time, high whiteness of the bleached fabric, difficult yellowing, small pollution and the like, and is widely applied to bleaching of polyester, cotton, silk or blended fibers. However, when hydrogen peroxide bleached fabrics are treated under high temperature and high alkali conditions, H2O2Easy decomposition, high energy consumption, long treatment time, great damage to fiber, severe reduction of fabric strength, improvement of production cost and certain resource waste.
Disclosure of Invention
The invention aims to provide a method for bleaching cotton fabrics by using polyoxometallate, which has the characteristics of short processing time, small environmental pollution and small damage to the fabrics, and the obtained bleached fabrics have the characteristics of high whiteness, difficult yellowing and the like.
In order to solve the technical problems, the invention provides a method for bleaching cotton fabrics by using polyoxometallate, which comprises the following steps:
1) removing grease and wax on the surface of the cotton fabric by using ether, and then soaking the cotton fabric into an acid solution containing a chelating agent and having a pH value of 5-6 for treatment to remove metal ions carried on the surface of the cotton fabric;
2) adding 5-10% of omf polyoxometallate into a mixed solution containing hydrogen peroxide, a refining agent and a penetrating agent, and adjusting the pH to 6-12 by using a pH regulator under uniform stirring to obtain a bleaching solution;
3) soaking the cotton fabric obtained by the treatment in the step 1) in the bleaching liquid for treatment for 10-40 min according to a bath ratio of 1 (5-30) at the temperature of 30-70 ℃, adding sodium silicate for continuous treatment for 10-30 min, taking out, washing and drying.
Preferably, the chelating agent in the step 1) is ethylenediamine tetraacetic acid, and the using amount of the chelating agent is 1-2 g/L.
Preferably, the treatment time in the step 1) is 40-80 min, and the treatment temperature is 40-80 ℃.
Preferably, the content of each component in the mixed solution in the step 2) is as follows: 2-4 wt% of sodium dodecyl benzene sulfonate, 4-8 wt% of fatty alcohol-polyoxyethylene ether, 1-2 wt% of sodium chloride, 2-3 wt% of citric acid, 1-2 wt% of methacrylic acid, 1-3 wt% of alkyl phosphate, 5-10 wt% of lauryl alcohol polyoxyethylene ether, 2-5 wt% of octanol, 2-4 wt% of polyethylene glycol ether and the balance of deionized water.
Preferably, the penetrating agent in the step 2) is fatty alcohol-polyoxyethylene ether.
Preferably, the polyoxometallate in the step 2) is a molybdenum-based Anderson-type polyacid compound.
Preferably, the molybdenum-based Anderson-type polyacid compound is a molybdenum-based Anderson-type polyacid compound K5CuPMo11O39Or molybdenum Anderson type polyacid compound MnMoO4。
Preferably, the mass volume ratio of the sodium silicate to the bleaching liquid in the step 3) is 1-5 g: 1L.
Preferably, the drying temperature in the step 3) is 60-100 ℃.
Compared with the prior art, the method adopts the molybdenum Anderson polyacid compound as the activating agent of the hydrogen peroxide to be added into the bleaching liquid, and the molybdenum Anderson polyacid compound ionizes trace metal ions in the bleaching liquid, so that the activation energy of the decomposition of the hydrogen peroxide in the bleaching liquid is reduced, high-activity hydroxyl free radicals are released, and the ineffective decomposition of the hydrogen peroxide is reduced, so that the hydrogen peroxide achieves an ideal bleaching effect at lower temperature and alkali concentration, the production cost is reduced, and the problem of oxidative damage of cotton fabrics caused by high temperature and high alkali is solved.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the present invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the present invention and is not intended to limit the scope of the claims which follow.
All of the starting materials of the present invention, without particular limitation as to their source, may be purchased commercially or prepared according to conventional methods well known to those skilled in the art.
The invention provides a cotton fabric bleaching process using polyoxometallate, which comprises the following steps:
1) removing grease and wax on the surface of the cotton fabric by using ether, and then soaking the cotton fabric into an acid solution containing a chelating agent and having a pH value of 5-6 for treatment to remove metal ions carried on the surface of the cotton fabric;
2) adding 5-10% of omf polyoxometallate into a mixed solution containing hydrogen peroxide, a refining agent and a penetrating agent, and adjusting the pH to 6-12 under uniform stirring to obtain a bleaching solution;
3) soaking the cotton fabric obtained by the treatment in the step 1) in the bleaching liquid for treatment for 10-40 min according to a bath ratio of 1 (5-30) at the temperature of 30-70 ℃, adding sodium silicate for continuous treatment for 10-30 min, taking out, washing and drying.
Specifically, firstly, removing grease and wax on the surface of the cotton fabric by using ether, and then soaking the cotton fabric into an acid solution containing a chelating agent and having the pH of 5-6 for treatment to remove Ca carried on the surface of the cotton fabric2+、Mg2+And (4) plasma metal ions. In the invention, the chelating agent is preferably Ethylene Diamine Tetraacetic Acid (EDTA), and the dosage is 1-2 g/L; the treatment time is preferably 40-80 min, and the treatment temperature is preferably 40-80 ℃.
Then, a mixed solution of hydrogen peroxide, a refining agent and a penetrant is prepared. The content of each component in the mixed solution is preferably as follows: 2-6 g/L of hydrogen peroxide, 1-2 g/L of scouring agent and 1-2 g/L of penetrating agent. Wherein, the penetrating agent is preferably fatty alcohol-polyoxyethylene ether. The refining agent is preferably a mixture prepared by compounding sodium dodecyl benzene sulfonate, fatty alcohol-polyoxyethylene ether, sodium chloride, citric acid, methacrylic acid, alkyl phosphate, lauryl alcohol-polyoxyethylene ether, octanol, polyglycol ether and deionized water, wherein the mass percentages of the components are preferably as follows: 2-4% of sodium dodecyl benzene sulfonate, 4-8% of fatty alcohol-polyoxyethylene ether, 1-2% of sodium chloride, 2-3% of citric acid, 1-2% of methacrylic acid, 1-3% of alkyl phosphate, 5-10% of lauryl alcohol-polyoxyethylene ether, 2-5% of octanol, 2-4% of polyethylene glycol ether and the balance of deionized water. The refining agent in the invention adopts more preferable mass percentage: 3% of sodium dodecyl benzene sulfonate, 5% of fatty alcohol-polyoxyethylene ether, 1% of sodium chloride, 3% of citric acid, 2% of methacrylic acid, 2% of alkyl phosphate, 8% of lauryl alcohol polyoxyethylene ether, 3% of octanol, 3% of polyethylene glycol ether and the balance of deionized water.
After the mixed solution of the hydrogen peroxide, the refining agent and the penetrating agent is prepared, 5-10% of omf polyoxometallate is added, and the pH is adjusted to 6-12 under uniform stirring to obtain the bleaching liquid. In the present invention, the pH is adjusted by using a commercially available sodium hydroxide solution, and any other alkaline solution which can be used for adjusting the pH can be used. In the present invention, the polyoxometallate is preferably a molybdenum-based Anderson-type polyacid compound, and more preferably a molybdenum-based Anderson-type polyacid compound K5CuPMo11O39Or molybdenum Anderson type polyacid compound MnMoO4。
And (3) after obtaining the bleaching liquid, soaking the cotton fabric obtained by ether cleaning and chelating agent-containing acid solution treatment in the bleaching liquid for treatment for 10-40 min at the temperature of 30-70 ℃ according to the bath ratio of 1 (5-30), adding sodium silicate for continuous treatment for 10-30 min, taking out, washing and drying. The mass volume ratio of the sodium silicate to the bleaching liquid added in the method is preferably 1-5 g: 1L. The drying temperature is preferably 60 ℃ to 100 ℃.
To further illustrate the present invention, a cotton fabric bleaching process using polyoxometallate provided by the present invention is described in detail below with reference to examples.
Example 1
1) 10g of the cotton fabric was freed from surface oils and waxes with an organic solvent.
2) Immersing the cotton fabric in an acid solution of 100ml pH 5, and adding 01g of EDTA, treating for 70min at the temperature of 50 ℃ to remove Ca carried on the surface of the cotton fabric2+、Mg2+And (4) plasma metal ions.
3) 0.5g of polyoxometallate (MnMoO)4) Added to 300mL of a solution containing 0.9g of hydrogen peroxide (H)2O2100 percent), 0.3g of scouring agent and 0.3g of penetrating agent (JFC), and adjusting the pH value of the mixed solution to 8 by using 0.1mol/L of sodium hydroxide under uniform stirring to obtain a bleaching solution.
The refining agent comprises the following components in percentage by mass: 3% of sodium dodecyl benzene sulfonate, 5% of fatty alcohol-polyoxyethylene ether, 1% of sodium chloride, 3% of citric acid, 2% of methacrylic acid, 2% of alkyl phosphate, 8% of lauryl alcohol polyoxyethylene ether, 3% of octanol, 3% of polyethylene glycol ether and the balance of deionized water.
4) Soaking cotton fabric with surface removed grease, wax and metal ions into MnMoO4Treating the cotton fabric in the bleaching solution at 40 ℃ for 30min, adding 0.9g of sodium silicate for treating the cotton fabric for 20min, taking out the cotton fabric, washing and drying the cotton fabric to obtain the bleached cotton fabric.
Example 2
1) 5g of the cotton fabric was freed from surface oils and waxes by means of an organic solvent.
2) Immersing cotton fabric in 100ml of acid solution with pH of 6, adding 0.2g of EDTA, and treating at 60 deg.C for 50min to remove Ca on the surface of cotton fabric2+、Mg2+And (4) plasma metal ions.
3) 0.5g of polyoxometallate (K)5CuPMo11O39) Added to 100mL of a solution containing 0.5g of hydrogen peroxide (H)2O2100 percent), 0.2g of scouring agent and 0.2g of penetrating agent (JFC), and adjusting the pH value of the mixed solution to 10 by using 0.1mol/L of sodium hydroxide under uniform stirring to obtain a bleaching solution.
The refining agent comprises the following components in percentage by mass: 3% of sodium dodecyl benzene sulfonate, 5% of fatty alcohol-polyoxyethylene ether, 1% of sodium chloride, 3% of citric acid, 2% of methacrylic acid, 2% of alkyl phosphate, 8% of lauryl alcohol polyoxyethylene ether, 3% of octanol, 3% of polyethylene glycol ether and the balance of deionized water.
4) Will removeImmersing cotton fabric containing surface oil, wax and metal ions into K5CuPMo11O39The bleaching solution is processed for 20min at the temperature of 50 ℃, then 0.3g of sodium silicate is added for processing for 15min, and then the bleaching solution is taken out, washed and dried to obtain the bleached cotton fabric.
Example 3
1) 10g of the cotton fabric was freed from surface oils and waxes with an organic solvent.
2) Immersing cotton fabric in 50ml of acid solution with pH of 6, adding 0.1g of EDTA, and treating at 80 deg.C for 40min to remove Ca on the surface of cotton fabric2+、Mg2+And (4) plasma metal ions.
3) 1g of polyoxometallate (MnMoO)4) Added to 80mL of a solution containing 0.48g of hydrogen peroxide (H)2O2100%), 0.16g scouring agent and 0.16g penetrating agent (JFC), and adjusting the pH value of the mixed solution to 12 by 0.1mol/L sodium hydroxide under uniform stirring to obtain a bleaching solution.
The refining agent comprises the following components in percentage by mass: 3% of sodium dodecyl benzene sulfonate, 5% of fatty alcohol-polyoxyethylene ether, 1% of sodium chloride, 3% of citric acid, 2% of methacrylic acid, 2% of alkyl phosphate, 8% of lauryl alcohol polyoxyethylene ether, 3% of octanol, 3% of polyethylene glycol ether and the balance of deionized water.
4) Soaking cotton fabric with surface removed grease, wax and metal ions into MnMoO4The bleaching solution is treated for 15min at the temperature of 60 ℃, then 0.4g of sodium silicate is added for treatment for 10min, and then the bleaching solution is taken out, washed and dried to obtain the bleached cotton fabric.
The whiteness of the bleached cotton fabric obtained in examples 1 to 3 was measured using a Datacolor 650 spectrophotometer. The whiteness measurement was evaluated by the CIE whiteness index with reference to AATCC TM 110-. During the test, the fabric is stacked to 8 layers, the fabric is measured for 5 times at different positions, the average value is taken, and the test result is shown in table 1.
TABLE 1 whiteness of cotton fabrics bleached by different examples
| Fabric | Whiteness (%) |
| Unbleached cotton fabric | 19.2 |
| Bleached cotton fabric (example 1) | 80.6 |
| Bleached cotton fabric (example 2) | 83.7 |
| Bleached cotton fabric (example 3) | 87.1 |
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A cotton fabric bleaching method using polyoxometallate is characterized by comprising the following steps:
1) removing grease and wax on the surface of the cotton fabric by using ether, and then soaking the cotton fabric into an acid solution containing a chelating agent and having a pH value of 5-6 for treatment to remove metal ions carried on the surface of the cotton fabric;
2) adding 5-10% of omf polyoxometallate into a mixed solution containing hydrogen peroxide, a refining agent and a penetrating agent, and adjusting the pH to 6-12 under uniform stirring to obtain a bleaching solution;
3) soaking the cotton fabric obtained by the treatment in the step 1) in the bleaching liquid for treatment for 10-40 min according to a bath ratio of 1 (5-30) at the temperature of 30-70 ℃, adding sodium silicate for continuous treatment for 10-30 min, taking out, washing and drying.
2. The bleaching method of cotton fabric according to claim 1, wherein the chelating agent in step 1) is ethylenediaminetetraacetic acid.
3. The bleaching method for cotton fabrics according to claim 1, characterized in that the treatment time in step 1) is 40-80 min and the treatment temperature is 40-80 ℃.
4. The bleaching method for cotton fabric according to claim 1, wherein the mixed solution in step 2) comprises the following components: 2-6 g/L of hydrogen peroxide, 1-2 g/L of scouring agent and 1-2 g/L of penetrating agent.
5. The bleaching method of cotton fabric according to claim 1, wherein the content of each component in the refining agent in step 2) is: 2-4 wt% of sodium dodecyl benzene sulfonate, 4-8 wt% of fatty alcohol-polyoxyethylene ether, 1-2 wt% of sodium chloride, 2-3 wt% of citric acid, 1-2 wt% of methacrylic acid, 1-3 wt% of alkyl phosphate, 5-10 wt% of lauryl alcohol polyoxyethylene ether, 2-5 wt% of octanol, 2-4 wt% of polyethylene glycol ether and the balance of deionized water.
6. The bleaching method of cotton fabric according to claim 1, wherein the penetrant in step 2) is fatty alcohol-polyoxyethylene ether.
7. The bleaching method for cotton fabric according to claim 1, characterized in that the polyoxometallate in step 2) is a molybdenum-based Anderson-type polyacid compound.
8. The bleaching method for cotton fabric according to claim 7, wherein the molybdenum-based Anderson-type polyacid compound is molybdenum-based Anderson-type polyacid compound K5CuPMo11O39Or molybdenum Anderson type polyacid compound MnMoO4。
9. The bleaching method of the cotton fabric according to claim 1, wherein the mass-to-volume ratio of the sodium silicate to the bleaching solution in the step 3) is 1-5 g: 1L.
10. The bleaching method of cotton fabric according to claim 1, characterized in that the drying temperature in step 3) is 60-100 ℃.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112522952A (en) * | 2020-12-14 | 2021-03-19 | 南通金滢纺织产品检测中心有限公司 | Preparation method of anti-pilling functional nylon fabric |
| CN112695528A (en) * | 2020-12-28 | 2021-04-23 | 浙江震东新材料有限公司 | Environment-friendly low-temperature scouring agent and preparation method and application thereof |
| CN113279245A (en) * | 2021-05-24 | 2021-08-20 | 南通大学 | Bleaching agent for bleaching human hair and bleaching method |
| CN113512878A (en) * | 2021-05-24 | 2021-10-19 | 南通大学 | Antistatic finishing agent, antistatic wig and preparation method thereof |
| CN114737401A (en) * | 2022-05-18 | 2022-07-12 | 江苏金秋弹性织物有限公司 | Low-alkali pretreatment process for in-situ catalytic degradation of impurities of cotton woven belts based on POMs (polyoxymethylene) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114737401A (en) * | 2022-05-18 | 2022-07-12 | 江苏金秋弹性织物有限公司 | Low-alkali pretreatment process for in-situ catalytic degradation of impurities of cotton woven belts based on POMs (polyoxymethylene) |
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