CN103147290B - Functional nano textile and preparation method thereof - Google Patents

Abstract

The invention discloses a functional nano textile and a preparation method thereof. The preparation method of the functional nano-textiles comprises the following steps: Step (1) In an organic solvent, the inorganic nanoparticles containing hydroxyl groups on the surface are reacted with compounds containing groups capable of reacting with hydroxyl groups and carbon-carbon double bonds, namely Obtaining modified inorganic nanoparticles; step (2) performing graft copolymerization on the modified inorganic nanoparticles, monomer A and textiles prepared in step (1). The preparation method of the present invention does not need to add adhesives, resins or crosslinking agents, maintains the original textiles' properties such as hand feeling, air permeability and moisture permeability to the greatest extent, is suitable for wearing fabrics, and has low cost and is suitable for mass production. The functional nano-textile of the present invention has excellent washing resistance and abrasion resistance, and has long-lasting functions.

Description

A kind of functional nano-textile and preparation method thereof

technical field

The invention specifically relates to a functional nano-textile and a preparation method thereof.

Background technique

Nanomaterials generally refer to any type of material composed of nanometer-sized structural units, including single crystals or polycrystals, clusters, and particles with a particle size of less than 100nm. Incomparable features and functions, the scope of application has been involved in various industries and fields. In recent years, as a new type of textile functional finishing agent, nanomaterials have attracted great attention from various governments and industries, and become one of the research hotspots in the 21st century. Nanomaterials have brought new vigor and vitality to the textile industry. The new textiles manufactured by nanotechnology have promoted the transformation of the traditional textile industry into a high-tech industry and played a huge role in promoting the technological progress of the textile industry. However, as a textile industry that is closely related to human life, the application of nanomaterials has just started. Introducing high-tech nanomaterials into the textile industry and developing new textile products with multiple functions and high added value can improve the technical competition level of my country's textile industry. , Bringing a revolutionary breakthrough and broad living space to the textile industry.

The preparation methods of reported functional nano-textiles are summarized as follows:

1. Blending type, that is, functional nanoparticles are mixed in the polymerization and spinning stages. The blending type includes two methods: solution blending and melt blending: ①The preparation process of the solution blending method is to dissolve the substrate compound in an appropriate solvent, then add nanoparticles, mix well, carry out polymerization reaction, and then carry out Spinning processing; ②The use of melt blending method is to add nanoparticles in the polymer spinning process to prepare functional fibers.

Although the hybrid process can obtain a persistent effect, the nanoparticles are easy to aggregate, difficult to disperse, and easy to block the spinning hole during the spinning process, resulting in increased production difficulty and reduced fiber performance; in addition, the blending method is only suitable for the production of chemical fibers. It cannot be used in natural fiber textiles and has certain limitations.

2. Finishing type, that is, to adsorb or fix functional nanoparticles in the finishing stage of fabrics. The finishing process is mainly divided into three types: ① Nanoparticles are directly added to the textile finishing agent as a solid substance; ② The emulsion of nanoparticles and the textile finishing agent are uniformly mixed and used for textile finishing; Applied to textile surfaces in presence to form a functional coating.

The post-finishing type is simple and easy to operate and endows textiles with specific functions without changing the original production process and equipment. It is suitable for mass production of functional products and has become a commonly used method for producing functional nano-textiles, especially suitable for natural nano-textiles. Functional finishing of fiber textiles.

However, in the post-finishing process, the nanomaterials are mostly combined with the textiles by means of adhesives, resins or crosslinking agents. This physical combination has weak fastness, poor durability, and unsustainable functions. Wearing properties such as product feel, breathability and moisture permeability will also be greatly reduced.

Contents of the invention

The technical problem to be solved by the present invention is to provide a functional nano-textile in order to overcome the existing functional nano-textiles, such as weak bonding fastness between nanoparticles and textiles, poor durability, non-permanent function, and poor wearability of the product. Textiles and methods for their preparation. The preparation method of the present invention does not need to add adhesives, resins or crosslinking agents, maintains the original textiles' properties such as hand feeling, air permeability and moisture permeability to the greatest extent, is suitable for wearing fabrics, and has low cost and is suitable for mass production. The functional nano-textile of the present invention has excellent washing resistance and abrasion resistance, and has long-lasting functions.

The present invention provides a kind of preparation method of functional nano-textile, it comprises the following steps:

Step (1): In an organic solvent, react inorganic nanoparticles containing hydroxyl groups on the surface with compounds containing groups capable of reacting with hydroxyl groups and carbon-carbon double bonds (C=C) to obtain modified inorganic nanoparticles; Wherein, the group that can react with hydroxyl is carboxyl, C ₁ ~C ₁₂ alkyl-oxycarbonyl, C ₁ ~C ₁₂ alkyl-carbonyloxy, ClCO-, or epoxy groups; the compound contains at least one of the above groups and at least one carbon-carbon double bond (C=C); the inorganic nanoparticles with hydroxyl groups on the surface are nano TiO ₂ , nano ZnO, nano SiO ₂ , nano-Al ₂ O ₃ , nano-MgO and nano-ZrO ₂ ; the particle diameter of the inorganic nanoparticles is between 1 and 100 nm; the organic solvent is methanol, ethanol, isopropanol, acetone , tetrahydrofuran, dioxane, N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, toluene and xylene;

Step (2): Carry out graft copolymerization of the modified inorganic nanoparticles, monomer A and textiles prepared in step (1); wherein, the monomer A is styrene, acrylonitrile, acrylic acid , acrylates, methacrylic acid, methacrylates, acrylamide, N-isopropylacrylamide, vinylpyridine and vinylpyrrolidone; the textiles are made of natural fibers and / or fabrics or nonwovens made of synthetic fibers.

In step (1), the organic solvent is preferably toluene or xylene. The volume mass ratio between the organic solvent and the inorganic nanoparticles is preferably 10ml/g-100ml/g. The molar ratio of the inorganic nanoparticles to the compound is preferably 1:0.5-1:20 (more preferably 1:1-1:10). The reaction temperature is preferably 4-180°C (more preferably 60-140°C). The reaction time is generally 0.5-72 hours.

In step (1), the compound containing a group capable of reacting with a hydroxyl group and a carbon-carbon double bond (C=C) is preferably maleic anhydride, acrylic acid, methyl acrylate, acryloyl chloride, methacrylic acid shrink One or more of glyceride esters and hydroxypropyl methacrylate.

In step (2), the natural fiber is preferably one or more of cotton, wool, silk and hemp fibers. The synthetic fibers are preferably nylon, polyester, polypropylene, acrylic, vinylon, spandex, polyethylene, polyvinyl chloride, aromatic polyamide, aromatic polyester, polysulfone, polyethersulfone, polyetherketone, poly One or more of ether ether ketone, polyvinylidene fluoride, polystyrene, polycarbonate and cellulose fibers.

In step (2), the method and conditions of the graft copolymerization reaction can be conventional methods and conditions of this type of reaction in the art, and the polymerization method in the graft copolymerization reaction can be bulk polymerization, suspension polymerization, Solution polymerization or emulsion polymerization. The initiation mode of graft copolymerization can be radiation initiation (it can be pre-irradiation grafting or co-irradiation grafting), plasma initiation, chemical initiator initiation or ultraviolet light initiation. The mass ratio between the monomer A and the modified inorganic nanoparticles prepared in step (1) is preferably 100:1-0.1:1. The mass ratio between the textile and the modified inorganic nanoparticles prepared in step (1) is preferably 1:0.1-1:10.

According to the present invention, the method of graft copolymerization in step (2) can be bulk polymerization, dispersion polymerization, solution polymerization or emulsion polymerization. The difference lies in the existence of monomers during graft copolymerization. Bulk polymerization and pure monomers are directly grafted with modified particles and textiles; suspension polymerization is that monomers are suspended in water in the form of small droplets, and then mixed with modified particles. Inorganic nanoparticles and textiles undergo graft copolymerization reaction, and the preparation method of monomer suspension is to combine monomer, dispersant (dispersant is commonly used dispersant in this field such as sodium polyacrylate, calcium phosphate, etc., not listed in detail) and water It is made into a suspension under stirring; solution polymerization is to dissolve the monomer in a solvent (depending on the solubility of different monomers, the solvent can be water, alcohols, acetone, tetrahydrofuran, N,N-dimethylformamide, N , N-dimethylacetamide, N-methyl-2-pyrrolidone, toluene, xylene, dioxane, dimethyl sulfoxide, etc., will not be listed in detail), in the form of solution with modified inorganic nanoparticles Carry out graft copolymerization reaction with textiles; emulsion polymerization is monomer or emulsion form solution form and carry out graft copolymerization reaction with modified inorganic nanoparticles and textiles, and the preparation method of emulsion is monomer, emulsifier (emulsifier is commonly used emulsifier Agents such as Tween, Span, cetyltrimethylammonium bromide, sodium dodecylsulfonate. Sodium dodecylsulfate, sodium dodecylbenzenesulfonate, etc., will not be listed in detail ) and water to form an emulsion under stirring.

According to the present invention, the initiation mode of graft copolymerization can be radiation initiation (it can be pre-irradiation grafting or co-irradiation grafting), plasma initiation, chemical initiator initiation or ultraviolet light initiation, as explained below.

In the present invention, the radiation-induced graft copolymerization is a conventional method in the field, which may be pre-irradiation grafting or co-irradiation grafting. The pre-irradiation grafting method may include the following steps: the textile is irradiated with gamma rays or electron beams at 5 to 100 kGy in air or oxygen or an oxygen-free atmosphere, and then immersed in the modified inorganic nanoparticles and monomer A, single The solution of monomer A, the emulsion of monomer A, or the suspension of monomer A, or immersed in the modified inorganic nanoparticles and monomer A solution or emulsion (solution, emulsion, and suspension preparation methods are as described above) In the mixed liquid of , under nitrogen or inert gas atmosphere, the temperature is 25-95° C. for 0.5-12 hours, ie. The co-irradiation grafting method may include the following steps: the modified inorganic nanoparticles of textiles and monomer A, a solution of monomer A, an emulsion of monomer A or a suspension (solution, emulsion, suspension) of monomer A The preparation method is as described above) for padding in the mixed solution, and then irradiated with gamma rays or electron beams to 5-100 kGy in air or an oxygen-free atmosphere to obtain the product.

The plasma grafting method described in the present invention is a conventional method in the art, and may be pre-irradiation grafting or co-irradiation grafting. Preferably: pre-irradiation grafting: irradiate the textiles with plasma at a power of 20-500W for 0.5-20 minutes in air or oxygen or an oxygen-free atmosphere, and then immerse the irradiated textiles in the modified inorganic In the mixture of nanoparticles and monomer A, the solution of monomer A, the emulsion of monomer A or the suspension of monomer (the preparation method of solution, emulsion and suspension is as described above), in air or oxygen-free atmosphere , react at 25-95°C for 0.5-12 hours to obtain the product; co-irradiation grafting: the modified inorganic nanoparticles and monomer A, the solution of monomer A, the emulsion of monomer A or the monomer Padding in the mixed solution of the suspension of A, and then irradiating with plasma at a power of 20-1000w for 0.5-30 minutes in air or an oxygen-free atmosphere to obtain the product.

According to the present invention, the chemical grafting method is a conventional method in the art. Preferably, the following steps are included: immersing the textile in the mixed solution of the modified inorganic nanoparticles, initiator and monomer A, the solution of monomer A, the emulsion of monomer A or the suspension of monomer A, at 30 React at ~150°C for 2 to 24 hours to obtain it. The initiator is a commonly used initiator for polymerization, such as ammonium persulfate, dibenzoyl peroxide (BPO) or azobisisobutyronitrile (AIBN).

The ultraviolet light-induced grafting method described in the present invention is a conventional method in the art. It can be divided into two types, without adding photoinitiator or photosensitizer, or adding photoinitiator or photosensitizer. Preferably, the following steps are included: no photoinitiator or photosensitizer is added: it is suitable for textiles containing carbonyl groups such as silk, and the textiles are immersed in modified inorganic nanoparticles and monomer A, a solution of monomer A, and an emulsion of monomer A Or in the mixed liquid of the suspension of monomer A, irradiate with ultraviolet light for 10 minutes to 3 hours to obtain. Add photoinitiator or photosensitizer: suitable for various types of textiles, immerse textiles in modified inorganic nanoparticles, photoinitiator or photosensitizer, and monomer A, monomer A solution, monomer A emulsion or single The mixed liquid of the suspension of the body is irradiated with ultraviolet light for 10 minutes to 3 hours to obtain. The photoinitiators and photosensitizers used are photoinitiators or photosensitizers commonly used in the art, such as benzoin and its derivatives, benzophenones, anthrones, or acyl phosphorus oxides, and will not be listed in detail.

The grafting ratio of the textiles described in the present invention after grafting and copolymerization with the modified inorganic nanoparticles and monomer A can reach 0.5-500% (wt), preferably 5-100% (wt), and the modified The content of the final inorganic nanoparticles can be 0.1-10% (wt).

The present invention further provides functional nano textiles prepared by the above-mentioned preparation method of functional nano textiles.

On the basis of not violating common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain preferred examples of the present invention.

The reagents and raw materials used in the present invention are all commercially available.

The positive progress effect of the present invention is:

1. In the present invention, inorganic nanoparticles are bonded to textiles in the form of covalent bonds, with strong bonding fastness, excellent washing resistance and abrasion resistance, and long-lasting functions.

2. The present invention does not need to add adhesives, resins or crosslinking agents in the process of preparing functional nano-textiles, and maintains the original textiles' properties such as hand feeling, breathability and moisture permeability to the greatest extent, and is suitable for wearing fabrics.

3. The method of the present invention is simple and easy to implement, has low cost, is suitable for mass production, and is easy to popularize.

Description of drawings

Fig. 1a is a scanning electron micrograph of the nano-TiO ₂ -cotton fabric in the effect example 1 before being washed 250 times at home.

Fig. 1b is a scanning electron micrograph of the nano-TiO ₂ -cotton fabric after 250 household washes in effect example 1.

Fig. 2 is a graph showing the data results of measuring the mass percentage of modified TiO ₂ on the cotton cloth before and after washing by using thermogravimetric analysis (TG) in the effect example 1. Wherein, the abscissa is the three samples prepared in Example 1 (from left to right is followed by _TiO content of 4.2%, 1.7% and 0.9% products), black and white are respectively before washing and after washing , and the ordinate is the TiO ₂ content on the cotton cloth; the TiO ₂ content of the three samples before washing was 4.2%, 1.7% and 0.9%, respectively, and the TiO ₂ content changed little after washing.

Fig. 3 is an effect diagram of testing the photocatalytic self-cleaning effect of pure cotton fabric and nano TiO ₂ —cotton fabric in effect example 2.

Detailed ways

The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples. For the experimental methods that do not specify specific conditions in the following examples, select according to conventional methods and conditions, or according to the product instructions.

Embodiment 1 functional nanometer TiO ₂ - preparation of cotton fabric

Add 10g (0.13mol) nano _TiO2 particles, 20g (0.2mol) maleic anhydride, and 0.05g sodium acetate into 300mL xylene solution, raise the temperature to 120°C and stir for 2 hours to obtain C=C double bond modified nano TiO ₂ particles; 10 × 10 cm cotton fabric (weight w ₀ ) was padded three times in 200 mL of 5 wt% modified nano-TiO ₂ particles, 10 wt% acrylic acid in methanol solution, and the cobalt source was used in an oxygen-free atmosphere. The generated γ-rays were irradiated to 30kGy, and the weight w ₁ of the cotton fabric after the reaction was measured by weighing method, and the obtained product was tested by thermogravimetric analysis (TG) _. The weight w ₂ of the modified TiO ₂ is w ₂ /w ₁ *100%, and the grafting rate of acrylic acid is (w ₂ -w ₁ )/w ₀ *100%, which can be calculated as A functional nano-TiO ₂ -cotton fabric with a grafting rate of 59% was obtained, in which the functionally modified nano-TiO ₂ content was 4.2% (wt).

According to the above steps, other reaction conditions are the same, and the irradiation dose is 10kGy and 20kGy after the modified cotton fabric obtained on the modified _TiO The mass percentage is 0.9% and 1.7% respectively, and the acrylic acid grafting rate is respectively 18% and 31%. .

(Nano _TiO2 was purchased from Aladdin Reagent Co., Ltd., and other reagents were purchased from Sinopharm Shanghai Reagent Company)

Embodiment 2 functional nanometer ZnO ₂ - preparation of nylon fabric

Add 10g (0.10mol) nano- _ZnO2 particles, 7.2g (0.1mol) acrylic acid, and 0.05g sodium acetate into 300mL tetrahydrofuran solution, raise the temperature to 70°C and stir for 3 hours to obtain C=C double bond-modified nano- _ZnO2 particles ; The 5 × 5cm nylon fabric was irradiated to 60kGy by gamma rays produced by a cobalt source in an air atmosphere, and 10wt% modified nano-ZnO ₂ particles, 20wt% hydroxyethyl acrylate, 1wt% Tween-20 and 74wt% water Prepare an emulsion under stirring, immerse the irradiated nylon fabric in the emulsion, and raise the temperature to 75°C for 2 hours under nitrogen protection to obtain a functional nano-ZnO ₂ -nylon fabric with a grafting rate of 32%. , wherein the content of functionally modified nano-ZnO ₂ is 7.7% (wt). (monomer grafting rate and modified nanoparticles mass percent test method is the same as Example 1)

According to the above steps, other reaction conditions are the same, 30wt% modified nanometer ZnO ₂ particles, 0.3wt% hydroxyethyl acrylate, 0.5wt% Tween-20 and 69.2wt% water are made into an emulsion under stirring to obtain grafted Functional nano-ZnO ₂ -nylon fabric with a ratio of 11.2%, wherein the content of functionally modified nano-ZnO ₂ is 10.0% (wt).

(Nano ZnO ₂ was purchased from Hangzhou Wanjing New Material Co., Ltd., and other reagents were purchased from Sinopharm Shanghai Reagent Company)

Embodiment 3 functional nano-SiO ₂ —Preparation of polyester fabric

Add 6.1g (0.1mol) nano- _SiO2 particles, 80.6g (1mol) methyl acrylate, and 1g sodium hydroxide to 1000mL dimethyl sulfoxide solution, heat up to 160°C and stir for 1 hour to obtain functionally modified nano-SiO ₂ particles; 10×10cm polyester fabric was soaked in 200mL of 5wt% functionally modified nano- _SiO2 particles mixed with monomer vinylpyridine for three times, and then irradiated with plasma at a power of 300W for 5 minutes in an air atmosphere to obtain Functional nano-SiO ₂ -cotton fabric with a grafting rate of 38%, wherein the content of functionally modified nano-SiO ₂ is 3.9% (wt). (the test method of monomer grafting rate and modified nanoparticles mass percentage is the same as in Example 1)

According to the above steps, other reaction conditions are the same, 2wt% modified nano- _SiO2 particles, 20wt% vinylpyridine, 1wt% Tween-20 and 77wt% water are mixed into an emulsion under stirring, and the grafting rate is 40.2%. Functional nano-SiO ₂ —polyester fabric, wherein the content of functionally modified nano-ZnO ₂ is 1.3% (wt).

(Nano- _SiO2 was purchased from Hangzhou Wanjing New Material Co., Ltd., and other reagents were purchased from Sinopharm Shanghai Reagent Company)

Example 4 Functional Nano Al ₂ O ₃ —Preparation of Polyethylene Nonwovens

Mix 10.2g (0.1mol) nanometer Al ₂ O ₃ particles, 181g (2mol) acryloyl chloride, and 0.05g sodium acetate, and react in a nitrogen atmosphere at 4°C for 12 hours to obtain functionally modified nanometer Al ₂ O ₃ particles; Immerse 5×5cm silk in 100mL water, add 10wt% functionally modified nano-Al ₂ O ₃ particles, 10wt% vinylpyrrolidone, 0.2wt% ammonium persulfate, and raise the temperature to 80°C for 2 hours under nitrogen protection to obtain A functional nano-Al ₂ O ₃ -polyethylene nonwoven fabric with a grafting rate of 29%, wherein the Al ₂ O ₃ content is 2.4% (wt). (The test method of monomer grafting rate and modified nanoparticles mass percentage is the same as in Example 1)

According to the above steps, other reaction conditions are the same, 0.5 × 0.5cm silk is grafted to obtain a functional nano- _Al2O3 -polyethylene nonwoven fabric with _a grafting rate of ₁₅₅ %, wherein the _Al2O3 content is 21.0% (wt) (Nano Al ₂ O ₃ was purchased from Hangzhou Wanjing New Material Co., Ltd., and other reagents were purchased from Sinopharm Shanghai Reagent Company)

Example 5 Preparation of functional nano MgO—real silk

Add 10g (0.25mol) nano-MgO particles, 71g (0.5mol) glycidyl methacrylate, and 10g sodium hydroxide to 500mL water, heat up to 70°C and stir for 2 hours to obtain functionally modified nano-MgO particles; ×5cm silk cloth was dipped three times in styrene monomer containing 15wt% functionally modified nano-MgO particles. Under the condition of nitrogen protection, it was irradiated with ultraviolet light with a wavelength of 256nm for 20min, and a functional grafting rate of 38% was obtained. Nano MgO—real silk, in which the content of functionally modified nano MgO is 10.1% (wt). (The test method of monomer grafting rate and modified nanoparticles mass percentage is the same as in Example 1)

(Nano-MgO was purchased from Hangzhou Wanjing New Material Co., Ltd., and other reagents were purchased from Sinopharm Shanghai Reagent Company)

Example 6 Functional Nano ZrO ₂ —Preparation of Cellulose Fiber Nonwovens

Add 24.6g (0.2mol) nanometer _ZrO2 particles, 14.4g (0.1mol) hydroxypropyl methacrylate, and 0.05g sodium acetate into 300mL xylene solution, heat up to 140°C and stir for 1 hour to obtain functionally modified nanoparticle _ZrO2 particles; 5 × 5cm viscose nonwoven fabric was immersed in 100mL of methanol solution of 15wt% functionally modified nano- _ZrO2 particles, 30wt% hydroxypropyl methacrylate, 0.8wt% sodium dodecylbenzenesulfonate , add 0.1wt% benzophenone as a photoinitiator, and irradiate vertically with ultraviolet rays with a dominant wavelength of 254nm for 1 hour to obtain a functional nano-ZrO ₂ -cellulose fiber nonwoven fabric with a grafting rate of 31%, wherein the functional modification Nano ZrO ₂ content is 2.3% (wt). (The test method of monomer grafting rate and modified nanoparticles mass percentage is the same as in Example 1)

(Nano- _ZrO2 was purchased from Hangzhou Wanjing New Material Co., Ltd., and other reagents were purchased from Sinopharm Shanghai Reagent Company)

Effect Example 1 Nanometer TiO ₂ —Cotton fabric is washed 250 times by household effect experiment

The functionally modified nano-TiO ₂ product obtained in Example 1 with a content of 4.2% (wt) was observed with a scanning electron microscope before and after washing. The effect before washing is shown in Figure 1a, and the effect after washing is shown in Figure 1b. It can be found that the morphology of the cotton cloth does not change much before and after washing.

Use the TG method (carried out according to the TG method in Example 1) to measure the mass percent of TiO modified on the cotton cloth before and after washing, the results are shown in Figure ₂ , as can be seen from the figure, in accordance with ATCC61-2006, 2A standard After 50 cycles of accelerated washing (equivalent to 250 household daily washings), the mass percentage of modified _TiO on the cotton fabric changes very little, indicating that the modified cotton fabric obtained by the method of the present invention has a good washing resistance effect.

Effect Example 2

Take oil red and oleic acid mixture (wherein oil red content is 2.5g/L) as model pollutant, be coated with the unmodified cotton cloth (the unmodified cotton fabric in embodiment 1) after washing 50 cycles and On the modified cotton cloth, irradiate the cotton cloth with an ultraviolet lamp with a wavelength of 355nm, adjust the distance between the ultraviolet lamp tube and the cotton cloth, so that the ultraviolet light intensity on the cotton cloth is 2.0±0.1mW/cm2, and irradiate for 0, 5, 9, 24 hours Then take photos separately to observe the self-cleaning effect.

Among them, the modified cotton cloth is the functionally modified nano- _TiO2 prepared in Example 1. The content is 4.2% (hereinafter referred to as nano- _TiO2 -cotton fabric 3), 0.9% (hereinafter referred to as nano _-TiO2 -cotton fabric 1) and 1.7% % (hereinafter referred to as nano TiO ₂ —cotton fabric 2) functional nano TiO ₂ —cotton fabric.

The results are shown in Figure 3. The samples in Figure 3 are, from left to right:

pure cotton fabric;

Nano TiO ₂ —cotton fabric 1, functionally modified nano TiO ₂ content is 0.9%;

Nano TiO ₂ —cotton fabric 2, functionally modified nano TiO ₂ content is 1.7%;

Nano TiO ₂ —cotton fabric 3, the content of functionally modified nano TiO ₂ is 4.2%.

In Fig. 3 , from top to bottom are photos of the effects of 5 hours of ultraviolet light irradiation, 9 hours of ultraviolet light irradiation and 24 hours of ultraviolet light irradiation on the four samples before ultraviolet light irradiation.

Conclusion: Cotton fabrics introduced with nano-TiO ₂ have obvious self-cleaning effect, and the higher the content of nano-TiO ₂ , the better the self-cleaning performance.

Claims (10)

1. A preparation method for functional nano-textiles, characterized in that it comprises the following steps: Step (1): In an organic solvent, the inorganic nanoparticles containing hydroxyl groups on the surface are reacted with compounds containing groups capable of reacting with hydroxyl groups and carbon-carbon double bonds to obtain modified inorganic nanoparticles; wherein, the The group that can react with hydroxyl is carboxyl, C ₁ ~C ₁₂ alkyl-oxycarbonyl, C ₁ ~C ₁₂ alkyl-carbonyloxy, ClCO-, or epoxy group; the compound contains at least one of the above-mentioned groups and at least one carbon-carbon double bond; the inorganic nano-particles containing hydroxyl groups on the surface are nano-TiO ₂ , nano-ZnO, nano-SiO ₂ , nano-Al ₂ O _3. Any one of nano-MgO and nano- _ZrO2 ; the particle size of the inorganic nanoparticles is between 1 and 100 nm; the organic solvent is methanol, ethanol, isopropanol, acetone, tetrahydrofuran, dioxygen One or more of hexacyclic, N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, toluene and xylene; in step (1), The temperature of the reaction is 4～180°C; Step (2): Carry out graft copolymerization reaction of the modified inorganic nanoparticles, monomer A and textiles prepared in step (1); wherein, the monomer A is styrene, acrylonitrile, acrylic acid , acrylates, methacrylic acid, methacrylates, acrylamide, N-isopropylacrylamide, vinylpyridine and vinylpyrrolidone; the textiles are made of natural fibers and / or fabrics or nonwovens made of synthetic fibers. 2. the preparation method as claimed in claim 1 is characterized in that: in step (1), described organic solvent is toluene or xylene; The proportioning of described inorganic nanoparticles and described compound is molar ratio 1:0.5～1:20. 3. The preparation method according to claim 1, characterized in that: in step (1), the temperature of the reaction is 60-140°C. 4. preparation method as claimed in claim 1 is characterized in that: in step (1), described compound that contains the group that can react with hydroxyl and carbon-carbon double bond is maleic anhydride, acrylic acid, methyl acrylate , one or more of acryloyl chloride, glycidyl methacrylate and hydroxypropyl methacrylate. 5. preparation method as claimed in claim 1 is characterized in that: in step (2), described natural fiber is one or more in cotton, wool, silk and hemp fiber; Described synthetic fiber is Nylon, polypropylene, acrylic, vinylon, spandex, polyethylene, polyvinyl chloride, aramid, aromatic polyester, polysulfone, polyetherketone, polyetheretherketone, polyvinylidene fluoride, polystyrene, and polycarbonate one or more of esters. 6. The preparation method according to claim 5, characterized in that: the aromatic polyester is polyester. 7. the preparation method as claimed in claim 1 is characterized in that: in step (2), the polymerization mode in the described graft copolymerization reaction is bulk polymerization, suspension polymerization, solution polymerization or emulsion polymerization; Graft copolymerization The initiation mode is radiation initiation, plasma initiation, chemical initiator initiation or ultraviolet light initiation. 8. The preparation method according to claim 1, characterized in that: in the step (2), the mass ratio of the modified inorganic nanoparticles obtained from the monomer A to the step (1) is 100:1～ 0.1:1. 9. The preparation method according to claim 1, characterized in that: in step (2), the mass ratio of the modified inorganic nanoparticles obtained from the textile to step (1) is 1:0.1 to 1: 10. 10. The functional nano-textile prepared by the preparation method of the functional nano-textile according to any one of claims 1-9.