CN112323491A - Method for carrying out super-hydrophobic modification on waste cotton fabric by dopamine - Google Patents
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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
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
- D06M13/325—Amines
- D06M13/328—Amines the amino group being bound to an acyclic or cycloaliphatic carbon atom
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- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
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- D—TEXTILES; PAPER
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- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D—TEXTILES; PAPER
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- 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
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/10—Repellency against liquids
- D06M2200/12—Hydrophobic properties
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention relates to a method for carrying out super-hydrophobic modification on waste cotton fabrics by dopamine. The surface roughness is improved by constructing a micro-nano structure on the surface of the waste cotton fabric through dopamine, and then the surface energy of the surface of the waste cotton fabric is reduced by adopting long-chain alkylamine, so that the super-hydrophobic waste cotton fabric is finally obtained. The method has the advantages of simple process, short reaction period and environment-friendly material, and the finished super-hydrophobic waste cotton fabric has better durability and the like and has wide application value of oil-water separation and the like.
Description
Technical Field
The invention relates to a modification technology of waste cotton fabrics, in particular to a method for carrying out super-hydrophobic modification on waste cotton fabrics by dopamine.
Background
Cotton fabric is a common natural fiber fabric, and is widely favored by people due to its natural source and comfortable wear properties. With the increasing demand for textiles along with the ever-increasing demand for apparel, there are also many environmental concerns, such as shortage of raw materials and the accumulation of waste textiles. Data of China as a large textile country shows that the total output of waste textiles in China exceeds 2600 ten thousand tons in 2011, but the total output of waste textiles in China is only 230 ten thousand tons for recycling, and the recycling rate of the waste textiles is less than 10%, so that how to effectively recycle the waste textiles is a problem to be solved in China and even all over the world.
The super-hydrophobic material (the contact angle is more than 150 degrees) is a material with special wettability, the initial inspiration is derived from the lotus leaf effect, the nanometer protrusions and depressions on the lotus leaf surface, the binary structure of the nanorods and the covered wax-like material endow the lotus leaf with super-hydrophobicity, and the water drop and the lotus leaf surface form a layer of air film due to the micro-rough structure and the wax-like substance, so that the water drop cannot be wetted and is easy to slide off. The super-hydrophobic material has various uses in life, such as oil-water separation, surface self-cleaning, snow prevention, corrosion resistance and the like, and has wide application value. To date, there have been a lot of researches on the preparation method of super-hydrophobic materials, such as plasma etching method, sol-gel method, electrochemical deposition method, template method, etc., and the discovery of dopamine biomimetic mussel chemistry has also caused the research heat of extensive researchers in the field of surface function finishing, but most of the finishing methods have some problems, such as complex operation, long reaction period, use of fluorine-containing long-chain compounds as low surface energy substances, and serious environmental problems of such compounds.
Because the surface of the cotton fiber has a large number of hydroxyl groups and is easy to modify, many researches select cotton fabrics to modify, but most of waste cotton textiles are over-dyed and finished in a processing process, and are treated by using chemicals such as over-dyed materials and the like, and the waste cotton textiles are influenced in a recycling process, so that many finishing modes cannot be effective on the waste textiles, such as reactive dyes and direct dyes commonly used for dyeing cotton fabrics. Wherein the reactive dye is used as reactive dye, and the dyeing mechanism is that the reactive group of the dye reacts with the fiber through nucleophilic addition-elimination substitution reaction (nucleophilic substitution reaction for short)Negative ion (Cell-O)-) The hydroxyl groups on the cotton fibers are covered in the dyeing process due to the uniform distribution and fixation of the hydroxyl groups on the fibers through covalent bond bonding, and the hydrophobic effect is influenced if enough micro-nano particles cannot be generated on the surface of the cotton fibers to improve the surface roughness or cannot be combined with enough hydrophobic compounds to optimize chemical components and reduce the surface energy in the subsequent finishing process due to the reduction of the hydroxyl groups on the cotton fibers. The direct dye is adsorbed on the surface of the fiber through intermolecular forces such as hydrogen bond, van der waals force and the like, and the dyeing adsorption process of the direct dye simultaneously conforms to Langmuir (Languir) adsorption equation and Freyardhui (Freundlich) adsorption equation, which shows that although the cellulose fiber molecules do not have 'dye seats' such as amino groups, carboxyl groups and the like on protein fibers, specific chemisorption sites also exist, and when the chemisorption sites are occupied by the dye, the chemisorption sites also have influence on the adsorption and deposition of modified finishing chemicals, and if the adsorption sites weaken on the finishing chemicals, the finishing of the chemicals on the surface of the fabric is uneven, and finally, the 'short-plate effect' is caused. Under the conditions, the waste cotton fabrics are required to be subjected to treatments such as dye desorption and the like and then subjected to modification finishing, wherein the steps are complicated. Therefore, it is necessary to invent a method for performing superhydrophobic modification finishing without performing complicated pretreatment such as dye decoloration on waste fabrics.
Dopamine (DA) is an analogue of the natural catecholamine substance dopa derived from marine mussel byssus protein, and has adhesion similar to mussel byssus protein due to its catecholamine structure. Dopamine can be oxidized and polymerized into polydopamine, but the mechanism is quite complex, the mechanism is not determined so far, and the polymerization mechanism is approximately that catechol structure is easy to be oxidized and polymerized into o-benzoquinone structure, then primary amine is cyclized and polymerized to generate the key cyclization product 5, 6-Dihydroxyindole (DHI) of dopamine by combining with the currently known research, and finally monomer supermolecule aggregate-polydopamine is formed by charge transfer, pi accumulation and hydrogen bond interaction. Polydopamine has excellent adhesion due to strong covalent/non-covalent interactions between the catechol moiety and the substrate, and can be deposited on a variety of substrate surfaces.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for carrying out superhydrophobic modification on waste cotton fabrics by dopamine.
The invention aims to provide a method for carrying out superhydrophobic modification on waste cotton fabric by dopamine, which comprises the following steps:
(1) in-situ coordination of iron ions: immersing waste cotton fabrics into 2-5 mM ferric salt water solution according to a bath ratio of 1: 20-1: 50, and treating in water bath at 40-60 ℃ for 5-20 minutes to obtain iron ion-matched cotton fabrics;
(2) in-situ compounding and in-situ oxidative polymerization of dopamine: treating the iron ion-matched cotton fabric by using 5-20 mM dopamine solution at a bath ratio of 1: 20-1: 50 at a treatment temperature of 40-60 ℃ for 5-30 minutes; then adding an oxidant into the solution to oxidize dopamine in situ, wherein the concentration of the oxidant in the solution is 5-20 mM to obtain an oxidative polymerization cotton fabric, and then washing and drying the oxidative polymerization cotton fabric;
(3) and (4) repeated finishing: repeating the steps (1) - (2) for 1-2 times again to obtain a multi-layer dopamine-coated cotton fabric;
(4) and (3) super-hydrophobic treatment: immersing a multi-layer dopamine-coated cotton fabric into a solution containing low-surface-energy substances at a bath ratio of 1: 20-1: 50, treating at 40-60 ℃, and washing and drying after treatment to obtain a super-hydrophobic cotton fabric; wherein the low surface energy material is selected from C14-C18An alkyl amine.
Further, before the step (1), the method also comprises the steps of cleaning the waste cotton fabric and removing soluble impurities.
Further, in the step (1), the waste cotton fabric includes waste white cotton fabric, cotton fabric dyed with a reactive dye, direct dye or vat dye.
In the invention, the cotton fabrics which are obtained by dyeing the waste white cotton fabrics with reactive dyes, direct dye dyeing and vat dye dyeing have a hydrophilic angle of 0 degree and are all super-hydrophilic fabrics.
Further, in step (1), the ferric salt is selected from ferric chloride and/or ferric sulfate.
Further, in steps (1) to (2), the processing modes are all oscillation processing.
Further, in step (2), the oxidizing agent is selected from sodium perborate, and/or hydrogen peroxide.
Further, in the step (2), adding an oxidant, and then oscillating in a water bath at 40-60 ℃ for 30-70 minutes.
Further, in the step (2), the washing and drying are specifically carried out by washing with water for 3 times, taking out and drying at 60-100 ℃.
Further, in the step (3), when the finishing is repeated, the finishing is repeated in the order of performing the step (1) and then performing the step (2).
Further, in the step (4), the low surface energy substance is one or more selected from the group consisting of tetradecylamine, hexadecylamine, and octadecylamine. Preferably octadecylamine.
Further, in the step (4), the concentration of the low surface energy substance in the solution containing the low surface energy substance is 1 to 10 mM.
Further, in step (4), the solvent used for the solution containing the low surface energy substance is an ethanol/water solution, wherein the ratio of ethanol: the volume ratio of the water is 5-7: 3-5.
Further, in the step (4), the treatment time is 2 to 6 hours.
Further, in the step (4), the processing mode is oscillation processing.
Further, in the step (4), the washing is performed 3 times with ethanol and then 3 times with water.
Based on the characteristic that polydopamine has no selectivity on a substrate, the polydopamine is used for carrying out super-hydrophobic finishing on waste cotton fabrics, and polymerization of dopamine is catalyzed by metal salt and an oxidant to promote the polymerization speed of dopamine so as to accelerate reaction and improve the problem of low polymerization speed of dopamine. Specifically, the principle of the present invention is as follows:
the method comprises the steps of compounding iron ions on cotton fabrics by using the principle of coordination of iron ions and hydroxyl groups, compounding dopamine on the surfaces of the cotton fabrics through the iron ions by using strong coordination of iron which is not completely coordinated and dopamine, catalyzing and oxidizing by using an oxidizing agent, promoting oxidative polymerization of the dopamine to generate an o-benzoquinone structure, further performing cyclization and auto-polymerization with primary amine groups of the o-benzoquinone structure to generate a key cyclization product 5, 6-Dihydroxyindole (DHI) of the dopamine, finally forming a supermolecular aggregate of the dopamine, namely polydopamine, by charge transfer, pi accumulation and hydrogen bond interaction combination, and adhering the polydopamine on the surfaces of the cotton fabrics to form a super-hydrophobic structure. According to the invention, no fluorine-containing compound is used in the preparation process, and the secondary micro-nano coarse structure is constructed by quickly depositing polydopamine on the surface of the cotton fabric, so that the nano air film on the surface of water and the cotton fabric is formed. And finally, oxidizing an o-benzoquinone structure formed by a catechol structure with an oxidizing agent, carrying out Schiff base reaction on the o-benzoquinone structure and a primary amino group to generate a C-N bond, grafting a low-surface-energy substance alkylamine, covering the surface of the polydopamine-coated cotton fabric, and enabling the waste cotton fabric to achieve a super-hydrophobic effect under the combined action of a long carbon chain of the alkylamine and a micro-nano structure constructed by the polydopamine.
By the scheme, the invention at least has the following advantages:
1. the invention uses the waste textile as the raw material, which is not only beneficial to solving the environmental pressure and damage caused by the waste textile, but also has low cost and wide source.
2. The polydopamine has excellent adhesiveness due to the catechol structure, can directly modify the waste dyed cotton fabric without dehydration and other treatments, has good stability of the modified fabric and better durability, and the finished super-hydrophobic waste cotton fabric has wide application prospect.
3. The dopamine is derived from natural animals and plants and is easy to degrade, so that the finished super-hydrophobic waste fabric cannot cause secondary pollution to the environment.
4. According to the invention, a micro-nano structure is constructed on the surface of the waste cotton fabric by dopamine to improve the surface roughness, and then long-chain alkylamine is adopted to reduce the surface energy of the surface of the waste cotton fabric, so that the super-hydrophobic waste cotton fabric is finally obtained. The method has the advantages of simple process, short reaction period and environment-friendly material, and the finished super-hydrophobic waste cotton fabric has better durability and the like and has wide application value of oil-water separation and the like.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a preferred embodiment of the present invention and is described in detail below.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
(1) In-situ coordination of iron ions: and cleaning the waste white cotton fabric, and removing soluble impurities. The washed cotton fabric was dipped into 2.4mM FeCl in a bath ratio of 1:403The solution was shaken in a water bath at 50 ℃ for 10 minutes, and then taken out.
(2) In-situ compounding of dopamine: a10.5 mM dopamine solution was prepared, iron ion-complexed cotton fabric was added thereto at a bath ratio of 1:30, and shaken in a water bath at 50 ℃ for 10 minutes.
(3) In-situ oxidative polymerization of dopamine: adding sodium perborate into the solution after dopamine in-situ coordination reaction to ensure that the concentration of the sodium perborate is 15mM, and shaking in a water bath at 50 ℃ for 60 minutes.
(4) Washing and drying: the cotton fabric subjected to in-situ oxidative polymerization is washed by deionized water for 3 times, taken out and dried in an oven at 60 ℃.
(5) And (4) repeated finishing: and (4) treating the dried and finished cotton fabric for 1 time again according to the process steps (1) to (4) to finish the cotton fabric to obtain the multilayer dopamine coated cotton fabric.
(6) And (3) super-hydrophobic treatment: immersing the multi-layer dopamine-coated cotton fabric into 5mM octadecylamine ethanol/water solution (the volume ratio of ethanol to water is 7:3) at a bath ratio of 1:50, carrying out shake reaction at 50 ℃ for 4 hours, taking out, washing with ethanol for three times, then using deionized water for 3 times, and then drying to obtain the super-hydrophobic cotton fabric.
Example 2
(1) In-situ coordination of iron ions: and cleaning the waste white cotton fabric, and removing soluble impurities. The washed cotton fabric was dipped in 4mM FeCl at a bath ratio of 1:303The solution was shaken in a water bath at 40 ℃ for 20 minutes and taken out.
(2) In-situ compounding of dopamine: a20 mM dopamine solution is prepared, iron ion-compounded cotton fabric is added into the dopamine solution according to a bath ratio of 1:30, and the solution is shaken in a water bath at 40 ℃ for 30 minutes.
(3) In-situ oxidative polymerization of dopamine: adding hydrogen peroxide into the solution after dopamine in-situ coordination reaction to ensure that the concentration of the hydrogen peroxide is 20mM, and shaking in a water bath at 40 ℃ for 70 minutes.
(4) Washing and drying: the cotton fabric subjected to in-situ oxidative polymerization is washed by deionized water for 3 times, taken out and dried in an oven at 60 ℃.
(5) And (4) repeated finishing: and (4) treating the dried and finished cotton fabric for 1 time again according to the process steps (1) to (4) to finish the cotton fabric to obtain the multilayer dopamine coated cotton fabric.
(6) And (3) super-hydrophobic treatment: immersing the multi-layer dopamine-coated cotton fabric into 5mM ethanol/water solution (the volume ratio of ethanol to water is 6:4) of hexadecylamine according to a bath ratio of 1:20, carrying out shaking reaction at 40 ℃ for 6 hours, taking out, washing with ethanol for three times, then using deionized water for 3 times, and then drying to obtain the super-hydrophobic cotton fabric.
Example 3
(1) In-situ coordination of iron ions: and cleaning the waste white cotton fabric, and removing soluble impurities. Soaking the cleaned cotton fabric in 2mM Fe at a bath ratio of 1:502(SO4)3The solution was shaken in a water bath at 60 ℃ for 5 minutes, and then taken out.
(2) In-situ compounding of dopamine: a10 mM dopamine solution is prepared, iron ion-compounded cotton fabric is added into the dopamine solution according to a bath ratio of 1:20, and the dopamine solution is shaken in a water bath at 60 ℃ for 10 minutes.
(3) In-situ oxidative polymerization of dopamine: adding hydrogen peroxide into the solution after dopamine in-situ coordination reaction to ensure that the concentration of the hydrogen peroxide is 15mM, and oscillating the solution in a water bath at 60 ℃ for 30 minutes.
(4) Washing and drying: the cotton fabric subjected to in-situ oxidative polymerization is washed by deionized water for 3 times, taken out and dried in an oven at 60 ℃.
(5) And (4) repeated finishing: and (4) treating the dried and finished cotton fabric for 1 time again according to the process steps (1) to (4) to finish the cotton fabric to obtain the multilayer dopamine coated cotton fabric.
(6) And (3) super-hydrophobic treatment: immersing the multi-layer dopamine-coated cotton fabric into 5mM ethanol/water solution of tetradecylamine (the volume ratio of ethanol to water is 5:5) at a bath ratio of 1:30, carrying out shake reaction at 60 ℃ for 2 hours, taking out, washing with ethanol for three times, then using deionized water for 3 times, and then drying to obtain the super-hydrophobic cotton fabric.
Example 4
(1) In-situ coordination of iron ions: and (3) cleaning the waste reactive blue dye dyed cotton fabric, and removing soluble impurities. The washed cotton fabric was dipped into 5mM FeCl at a bath ratio of 1:503The solution was shaken in a water bath at 50 ℃ for 10 minutes, and then taken out.
(2) In-situ compounding of dopamine: a10.5 mM dopamine solution was prepared, iron ion-complexed cotton fabric was added thereto at a bath ratio of 1:50, and shaken in a water bath at 50 ℃ for 10 minutes.
(3) In-situ oxidative polymerization of dopamine: adding sodium perborate into the solution after dopamine in-situ coordination reaction to ensure that the concentration of the sodium perborate is 15mM, and shaking in a water bath at 50 ℃ for 70 minutes.
(4) Washing and drying: the cotton fabric subjected to in-situ oxidative polymerization is washed by deionized water for 3 times, taken out and dried in an oven at 60 ℃.
(5) And (4) repeated finishing: and (4) treating the dried and finished cotton fabric for 1 time again according to the process steps (1) to (4) to finish the cotton fabric to obtain the multilayer dopamine coated cotton fabric.
(6) And (3) super-hydrophobic treatment: immersing the multi-layer dopamine-coated cotton fabric into 5mM octadecylamine ethanol/water solution (the volume ratio of ethanol to water is 7:3) at a bath ratio of 1:50, carrying out shake reaction at 50 ℃ for 4 hours, taking out, washing with ethanol for three times, then using deionized water for 3 times, and then drying to obtain the super-hydrophobic active blue-dyed cotton fabric.
The contact angle of the super-hydrophobic reactive blue dyed cotton fabric can reach 158.7 +/-2.56 degrees, so that the reactive dye dyed cotton fabric has no influence on the finishing method and still has excellent super-hydrophobic effect.
Example 5
(1) In-situ coordination of iron ions: the waste direct purplish red dye dyed cotton fabric is cleaned, and soluble impurities are removed. The washed cotton fabric was dipped into 2.4mM FeCl in a bath ratio of 1:403The solution was shaken in a water bath at 50 ℃ for 10 minutes, and then taken out.
(2) In-situ compounding of dopamine: a10.5 mM dopamine solution was prepared, iron ion-complexed cotton fabric was added thereto at a bath ratio of 1:40, and shaken in a water bath at 50 ℃ for 10 minutes.
(3) In-situ oxidative polymerization of dopamine: adding sodium perborate into the solution after dopamine in-situ coordination reaction to ensure that the concentration of the sodium perborate is 10mM, and shaking in a water bath at 50 ℃ for 50 minutes.
(4) Washing and drying: the cotton fabric subjected to in-situ oxidative polymerization is washed by deionized water for 3 times, taken out and dried in an oven at 60 ℃.
(5) And (4) repeated finishing: and (4) treating the dried and finished cotton fabric for 1 time again according to the process steps (1) to (4) to finish the cotton fabric to obtain the multilayer dopamine coated cotton fabric.
(6) And (3) super-hydrophobic treatment: immersing the multi-layer dopamine-coated cotton fabric into 5mM octadecylamine ethanol/water solution (the volume ratio of ethanol to water is 7:3) at a bath ratio of 1:50, carrying out shake reaction at 50 ℃ for 4 hours, taking out, washing with ethanol for three times, then using deionized water for 3 times, and then drying to obtain the super-hydrophobic active blue-dyed cotton fabric.
The contact angle of the super-hydrophobic direct purplish red dyed cotton fabric can reach 156.9 +/-2.49 degrees, so that the direct dye dyed cotton fabric has no influence on the finishing method and still has excellent super-hydrophobic effect.
Example 6
(1) Iron ionIn-situ matching of the seeds: and (3) cleaning the waste vat pink dye dyed cotton fabric, and removing soluble impurities. The washed cotton fabric was dipped into 2.4mM FeCl at a bath ratio of 1:503The solution was shaken in a water bath at 50 ℃ for 10 minutes, and then taken out.
(2) In-situ compounding of dopamine: a10.5 mM dopamine solution was prepared, iron ion-complexed cotton fabric was added thereto at a bath ratio of 1:30, and shaken in a water bath at 50 ℃ for 10 minutes.
(3) In-situ oxidative polymerization of dopamine: adding sodium perborate into the solution after dopamine in-situ coordination reaction to ensure that the concentration of the sodium perborate is 10mM, and shaking in a water bath at 50 ℃ for 50 minutes.
(4) Washing and drying: the cotton fabric subjected to in-situ oxidative polymerization is washed by deionized water for 3 times, taken out and dried in an oven at 60 ℃.
(5) And (4) repeated finishing: and (4) treating the dried and finished cotton fabric for 1 time again according to the process steps (1) to (4) to finish the cotton fabric to obtain the multilayer dopamine coated cotton fabric.
(6) And (3) super-hydrophobic treatment: immersing the multi-layer dopamine-coated cotton fabric into 5mM octadecylamine ethanol/water solution (the volume ratio of ethanol to water is 7:3) at a bath ratio of 1:50, carrying out shake reaction at 50 ℃ for 4 hours, taking out, washing with ethanol for three times, then using deionized water for 3 times, and then drying to obtain the super-hydrophobic active blue-dyed cotton fabric.
The contact angle of the super-hydrophobic vat pink dyed cotton fabric can reach 155.8 +/-2.38 degrees, so that the direct dye dyed cotton fabric has no influence on the finishing method and still has excellent super-hydrophobic effect.
Table 1 shows the results of water contact angle tests of the raw materials and the prepared superhydrophobic fabrics of examples 1 and 4-6, and it can be seen that the fabrics have excellent superhydrophobic effect after being finished by the method of the present invention.
TABLE 1 Water contact Angle of the materials of the different examples and of the treated fabrics
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for carrying out super-hydrophobic modification on waste cotton fabric by dopamine is characterized by comprising the following steps:
(1) immersing waste cotton fabrics into a 2-5 mM ferric salt water solution at a bath ratio of 1: 20-1: 50, wherein the treatment temperature is 40-60 ℃, and obtaining the cotton fabrics matched with iron ions;
(2) treating the iron ion-matched cotton fabric by using 5-20 mM dopamine solution at a bath ratio of 1: 20-1: 50, wherein the treatment temperature is 40-60 ℃, then adding an oxidant into the solution to oxidize dopamine in situ, wherein the concentration of the oxidant is 5-20 mM, so as to obtain oxidative polymerization cotton fabric, and then washing and drying the oxidative polymerization cotton fabric;
(3) repeating the steps (1) and (2) for 1-2 times again to obtain a multi-layer dopamine-coated cotton fabric;
(4) immersing the multi-layer dopamine-coated cotton fabric into a solution containing low-surface-energy substances at a bath ratio of 1: 20-1: 50, treating at 40-60 ℃, and washing and drying after treatment to obtain a super-hydrophobic cotton fabric; wherein the low surface energy substance is selected from C14-C18An alkyl amine.
2. The method of claim 1, wherein: in the step (1), the waste cotton fabrics include waste white cotton fabrics, cotton fabrics dyed with reactive dyes, direct dye dyed or vat dye dyed.
3. The method of claim 1, wherein: in step (1), the ferric salt is selected from ferric chloride and/or ferric sulfate.
4. The method of claim 1, wherein: in steps (1) - (2), the treatment modes are all oscillation treatment.
5. The method of claim 1, wherein: in step (2), the oxidizing agent is selected from sodium perborate and/or hydrogen peroxide.
6. The method of claim 1, wherein: in the step (2), the oxidant is added, and then the mixture is subjected to shaking treatment in a water bath at the temperature of 40-60 ℃ for 30-70 minutes.
7. The method of claim 1, wherein: in the step (4), the low surface energy substance is one or more selected from the group consisting of tetradecylamine, hexadecylamine and octadecylamine.
8. The method of claim 1, wherein: in the step (4), the concentration of the low surface energy substance in the solution containing the low surface energy substance is 1-10 mM.
9. The method of claim 1, wherein: in step (4), the solvent used for the solution containing the low surface energy substance is an ethanol/water solution, wherein the ratio of ethanol: the volume ratio of the water is 5-7: 3-5.
10. The method of claim 1, wherein: in the step (4), the treatment time is 2-6 hours.
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| CN112898441A (en) * | 2021-02-19 | 2021-06-04 | 湖州闪思新材料科技有限公司 | Preparation method of hydrophobic nano-cellulose material |
| CN115928441A (en) * | 2022-12-12 | 2023-04-07 | 广东省人民医院 | Cotton fabric with super-hydrophobic and antibacterial functions and preparation method thereof |
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