Nano-silver antibacterial finishing technology for polyester coral velvet knitted fabric
Nano-silver antibacterial finishing technology for polyester coral velvet knitted fabric
Nano-silver antibacterial finishing technology for polyester coral velvet knitted fabric
Summary: A preparation method of an emulsion of nano silver dopamine solid microspheres is introduced. And the application of this type of emulsion in the long-lasting antibacterial finishing of polyester bleached velvet knitted fabrics. In this study, Pluronic F-127, a copolymer of propylene oxide and ethylene oxide, was used as a reducing agent and dispersing agent. Loading nano silver ions, Then by melt spraying, The Pluronic F-127 microspheres loaded with nano-silver ions are protected with paraffin and finally compounded with dopamine. Formulated as an antibacterial finishing lotion for polyester bleached velvet knit fabrics. Experimental results show, The polyester-polyester velvet knitted fabric treated with the emulsion of such nano-silver dopamine solid microspheres has excellent durability and antibacterial effect.
Key words: Polyester Coral velvet Knitted fabric Dopamine Nano silver Antibacterial finishing
Coral velvet knitwear is soft to the touch. The texture is delicate and environmental protection is characteristic. Mainly used for nightgowns, Baby products, Children's wear, Inside the garment, Shoes and hats, toy, Car accessories, Craft products, Materials for home accessories and other aspects. In recent years, the home textile industry has become more and more popular. It is a cotton bathrobe replacement product that has just emerged in foreign countries. Coral fleece is fine, The flexural modulus is small, so that the fabric has outstanding softness. Due to the large specific surface area of ​​the fibers, Therefore, it has a high wicking effect and gas permeability. The fabric is comfortable to wear. Good decontamination. Because the fabric is supple, Can be closely attached to the object being wiped, Therefore, it has a good cleaning effect. However, the disadvantage of coral fleece fabric is that there are many fluff. Especially in the warm and humid season, Easy to breed bacteria, Inconvenient to use. Nanosilver is considered to be a non-toxic, environmentally friendly material with good antibacterial properties. Is widely used in various antibacterial preparations, It is an effective substitute for microbial resistance and environmental pollution caused by the abuse of organic antibacterial agents [1] . Nano silver has a wide range of applications in the field of textiles and clothing. Such as fiber, fabric, underwear, T -shirts, sweaters, socks, knee pads, bedding and so on. Dopamine (DOPE) is a bio-viscous substance. Exist in marine mussels. Since 2007 , LEE et al [1] published in " Technology " through organic / Inorganic materials (including inert metals, oxides, polymers, semiconductors, and ceramics) have been composited with dopamine to form multifunctional polymeric coatings [2] , Using the strong adhesion properties of the bioadhesive dopamine, The preparation of dopamine composite membranes has received increasing attention. Dopamine can improve the structural stability, hydrophilicity and separation performance of the composite membrane by its own adhesion.
A method for preparing a disclosed nano silver-containing antibacterial gel preparation, First, the silver nitrate solution is reduced with vitamin C to obtain nano silver. Then using nano silica as a carrier, Loading the prepared nano silver on the surface of the silica, Nano silver sol obtained; this sol and then with a proportion of carbomer (Carbomer) Mixing the excipients, An antibacterial gel preparation containing nanosilver was obtained.
Research and practice Although this method can effectively control the particle size and morphology of the obtained nano-silver, However, due to the carrier selection problem of nano silver, the obtained nano silver is easy to agglomerate and has a wide particle size distribution. There is also a problem of insufficient long-term use on woven or knitted fabrics. In order to solve the deficiencies of the prior art, In this experiment, a nano-silver dopamine solid microsphere emulsion prepared by the laboratory was used for antibacterial finishing of the polyester bleached velvet knitted fabric. And test its antibacterial effect, It provides a basis for the application of emulsions of nano-silver dopamine solid microspheres in woven or knitted fabrics.
1 experiment
1. 1 test material
Full polyester 166. 7 dtex/
1. 2 test aid
Pluronic F - 127 is a copolymer of propylene oxide and ethylene oxide, CAS No. 9
1. 3 test equipment
Freeze dryer , commercially available instrument, Model Specification not required; melting sprayer, a commercially available instrument, Model specifications are not required ; infrared sample dyeing machine X -ray photoelectron spectroscopy (XPS) ( Japan Shimadzu Corporation); Fully Automatic X -ray Diffractometer (XRD) D / max2550PC (Nippon Science); JSM - 5600LV Scanning Electron Microscope (SEM) (Japan Electronics Co., Ltd.); S - 4800 Field Emission Scanning Electron Microscope (FE - SEM) ( HITACHI , Japan ) ; Inductively Coupled Plasma Emission Spectrometer , Optima2000DV ( PerkinElmer, USA).
1. Preparation of 4 dopamine nano silver emulsion will
1. 5 fabric antibacterial finishing
An emulsion containing nano silver dopamine solid microspheres prepared by the above method, Antibacterial functional finishing of polyester coral velvet knitted fabrics. The polyester coral velvet knitted fabric is completely immersed in an emulsion containing nano silver dopamine solid microspheres (the weight ratio of the polyester coral velvet knitted fabric to the emulsion of the nano silver dopamine solid microspheres is 1:20 ), Temperature is
1. 6 test
Antibacterial performance test on antibacterial finishing polyester coral velvet knitted fabric, The comparison sample is polyester coral velvet knitted fabric treated by Rudolph RUCO-BAC AGP nano silver antibacterial finishing agent. The treatment process is the same as above. ( 1 ) The soaping method of the fabric is GB/T 3921 - 2008 (color fastness to soaping of textiles) Method of washing; ( 2 ) The content of nano silver in the fabric is recorded in the literature. Determination by an inductively coupled plasma optical emission spectrometer;
( 3 ) The antibacterial properties of fabrics are based on the dynamic test method for the antibacterial activity of sessile antibacterial agents published by the American Society for Testing and Materials (ASTM ) ( ASTM E2149-01 ) Test [9] , Test results: reduce bacteria; Test Methods: Dynamic shake flask test; Test strain: Staphylococcus aureus DSM 1104 ; Incubation period: 24 h .
2 Fiber & Textile Technology, Vol. 43
The fourth issue of He Liqing and so on: Nano-silver antibacterial finishing technology for polyester coral velvet knitted fabric
2 results and discussion
2. 1 Coral velvet nano silver dopamine composite membrane antibacterial effect test Table 1 is the antibacterial performance comparison of nano silver dopamine solid microsphere emulsion treatment and commercial nano silver antibacterial finishing agent. Table 1 Antibacterial effect of polyester bleached velvet knitted fabrics with different antibacterial finishing liquids
After two years of antibacterial finishing
Coral velvet knitted fabric
Antibacterial whole after soaping 10 times
Coral velvet knitted fabric
Antibacterial after 200 times of soaping
Finishing coral velvet knitted fabric
Nano silver content /
( mg · (
Fabric) -1 )
Antibacterial effect
/%
Nano silver content /
( mg · (
Fabric) -1 )
Antibacterial effect
/%
Nano silver content /
( mg · (
Fabric) -1 )
Antibacterial effect
/%
Nano silver content /
( mg · (
Fabric) -1 )
Antibacterial effect
/%
Preparation of this experiment
Nanosilver
Microsphere emulsion
As can be seen from Table 1 , The fabric treated with the nano silver solid microsphere emulsion prepared by the experiment, The silver content and antibacterial activity of the polyester coral velvet knitted fabric will not be lowered. The effect of soaping on the silver content of polyester coral velvet knitted fabrics is mainly concentrated in the first 10 soaping processes. The eluted silver content accounts for 21 % of the total silver content . In the subsequent soaping process, less silver particles are eluted, But the antibacterial activity did not decrease much, The performance is obviously superior to the fabric of the commercially available nano silver antibacterial finishing agent. It is proved that the polyester coral velvet knitted fabric treated by the nano silver dopamine solid microsphere emulsion prepared by the above method has good long-acting antibacterial activity. The reason why the nano-silver dopamine solid microsphere emulsion treated polyester coral velvet knitted fabric has good long-term antibacterial activity is that The preparation method adopts the propylene oxide segment of the amphiphilic Pluronic F-127 polymer and the terminal hydroxyl group thereof can reduce the silver ion to the nano silver under a certain temperature and time condition. The generated nano silver particles are deposited on the micelle formed by Pluronic F-127 . A nanosilver sol having good water dispersibility is obtained. Dopamine under mild conditions [3] , The fabric can be modified by the polymerization of various substrate surfaces to form a polydopamine film. The fabric surface is uniformly covered with a plurality of layers of polydopamine film, Then use the characteristics of good adhesion and reducibility in a humid environment [ 4 - 5 ] , The nanosilver solid microspheres are firmly bonded to the surface of the fabric by the next impregnation process. Thereby obtaining an antibacterial fabric loaded with nano-silver solid microspheres [5] . The nano silver antibacterial agent on the antibacterial fabric treated by the above antibacterial treatment releases the positively charged silver ions at a controlled rate. Firmly adsorb and penetrate the cell walls of bacteria and mold, Destroy the microbial electron transport system, respiratory system, and substance transport system to quickly kill the cells; After entering the cell body, It can also react with the hydroxyl groups of bacteria [6] , Coagulate the protein of the bacteria, Destroying the activity of bacterial cell synthetase, The cells die by losing their ability to divide and reproduce. Under the influence of light, The silver ion in the oxidized state can become a catalytically active center. Activates oxygen in water and air to produce OH radicals and reactive oxygen ions with strong oxidizing power . Destroy the reproductive capacity of bacteria in a short period of time, Causes bacterial death. When the bacteria lose their activity, Silver ions will be released from the bacteria. Repeat the sterilization activity [7 - 8] . The main reason why nano-silver has such an antibacterial effect is that the structural unit size of nano-silver is between macroscopic substances and microscopic atoms and molecules. It exhibits special surface effects, small size effects, quantum size effects and macroscopic quantum tunneling effects, allowing easy access to pathogens; The size of the nano silver particles is small, and the volume occupied by the surface is large. The bond and electronic states of the surface are different from the inside of the particle. Incomplete coordination of surface atoms leads to an increase in the active position of the surface. Has the basic conditions as an antibacterial agent [9] ; Has a strong penetrating power, Being able to fully and fully contact and attack pathogens, Thereby exerting a stronger biological effect, High security, Wide range of antibacterial, The advantages of continuous sterilization time are long. Antibacterial properties of silver nanoparticles especially pathogenic bacteria, kill bacteria, far greater than traditional rhusiopathiae silver ions 3 Table 2 shows that: The silver particles on the surface of the fabric loaded with silver nanoparticles prepared by the method have uniform distribution and the average particle diameter is below 100 nm . The silver content increases as the dopamine concentration or the silver nitrate concentration increases. When subjected to 10 soaping treatments, Although the retention of silver content on the surface of the antibacterial fabric is about 79.2 %, the loss of silver content is mainly concentrated in the first 10 soaping processes, accounting for 65 % of the total silver content in the soaping solution after 200 times of soaping. about, In the subsequent soaping process, The loss of silver content is not high, It can be proved that the fabric loaded with silver nanoparticles has better durability.
In the process of studying the antibacterial properties of fabrics, The dopamine modified fabric was found to be substantially non-antibacterial, For fabrics that are only treated by the adsorption process, Low silver ion content and poor antibacterial properties, And the washing fastness is low. For dopamine-modified fabrics loaded with silver nanoparticles, After undergoing 200 vigorous soaping treatments, The antibacterial effect is still very good, The antibacterial rate here is 98 %.
3 summary
Since the emulsion containing nano silver dopamine solid microspheres is sprayable or dip coated, It can be used as a functional finishing agent for antibacterial finishing of woven or knitted fabrics. Long-lasting, After 200 times of soaping , the killing rate can still reach 98% or more. Completely solve the problem that the nano silver antibacterial finishing agent is not resistant to soaping, Thereby achieving long-term effectiveness.
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