54results about How to "Improve antibacterial stability" patented technology

The invention discloses a lignin/silver composite antibacterial agent, and a preparation method and application thereof, belonging to the technical field of preparation of antibacterial agents. The method comprises the following steps: reacting alkali lignin with a carboxylation reaction to introduce an anionic functional group, and then adding a cationization reagent to introduce a cationic functional groups so as to obtain an anionic-cationic amphoteric lignin solution; then adjusting a system to allow the system to be negatively charged, adding a silver salt and carrying out light-tight absorption so as to obtain a lignin/silver mixed solution; and then adjusting the system to allow the system to be positively charged, and successively carrying out aging, separation and drying so as to obtain the lignin/silver composite antibacterial agent. According to the method, lignin is subjected to chemical modification, and pH value regulation is carried out so as to allow the lignin to have properties like an anionic-cationic amphoteric polymer, so the prepared lignin/silver composite antibacterial agent has a positively-charged surface, substantially enhanced bactericidal ability, long-lasting bactericidal efficacy and high compatibility with high polymers; and when the lignin/silver composite antibacterial agent is applied to preparation of antibacterial materials, the problems of poor stability, short duration of bactericidal efficacy and high cost of conventional silver-series antibacterial agents are overcome.

The invention discloses a high-performance wickerwork coating which is prepared from the following components: waterborne polyurethane, silicon-acrylate emulsion, dioctyl phthalate, shellac resin, mung bean starch, polyvinyl alcohol, a filler, an antibacterial additive and water. Compared with the existing wickerwork coating, the wickerwork coating disclosed by the invention is high in storage stability and long in coating film service life; compared with the coating film service life of the common wickerwork coating, the coating film service life of the high-performance wickerwork coating is prolonged by twice or triple; a paint layer formed by the coating is touch, high in brightness, high in adhesive force, anti-acid, anti-sulfur, high in salt resistance, stable in performance, and not liable to corrode and discolor; the coating disclosed by the invention is extremely high in high-temperature resistance, high in adhesive force, and not liable to fall off; furthermore, during use, the coating can be quickly dried and is high in leveling property; moreover, the coating is harmless to the environment and a human body, and is environment-friendly.

The invention discloses a method for preparing Nisin/chitosan/polylactic acid composite nanofiber mats by coaxial electrospinning. The method comprises the following steps: dissolving chitosan in an acetic acid solution, stirring and dissolving to prepare a chitosan solution; adding Nisin, stirring to prepare a Nisin/chitosan solution which is used as a shell spinning solution for coaxial electrospinning; dissolving polylactic acid in dichloromethane to prepare a polylactic acid solution which is used as a core spinning solution for coaxial electrospinning; and carrying out coaxial electrospinning on the shell spinning solution and the core spinning solution to prepare the Nisin/chitosan/polylactic acid composite nanofiber mat with Nisin and chitosan as the shell and with polylactic acid as the core. The method is simple and feasible, and cost is low. The prepared biodegradable bioactive antiseptic composite nanofiber mat can be used in the fields of wound dressing, tissue engineering and food package and the like, has excellent antibacterial effects, is safe and harmless, and will not cause drug resistance of bacteria.

The invention provides a preparation method of an antibacterial and heat-accumulating radix isatidis modified PE master batch. The preparation method comprises the following steps: dissolving a radixisatidis extract, modifying the radix isatidis extract, preparing a loading agent, loading the extract, preparing a functional master batch and carrying out post-treatment, wherein the post-treatmentcomprises the steps of preparing a post-treatment solution, mixing and heating the components, and cleaning and drying the mixture; the preparation of the post-treatment liquid comprises the followingraw material components in parts by weight: 10 to 13 parts of grape polyphenol, 6 to 8 parts of sorbitol, 15 to 18 parts of sodium alginate, 7 to 7.8 parts of gallic acid, 2 to 3 parts of sodium stearate, 9 to 11 parts of glycerol, 4 to 5 parts of vitamin E, 3 to 3.5 parts of mannitol and 30 to 35 parts of deionized water. According to the preparation method, the antibacterial stability, the washing resistance and the heat storage performance of the isatis root modified PE master batch are improved.

The invention discloses a systemic active antibacterial cellulose composite fiber and a preparation method thereof. The cellulose-based silver/graphene oxide/zinc oxide composite fiber uses porous cellulose as a support, nanometer zinc oxide and graphene oxide are distributed in the cellulose matrix, and nano-silver coats the surface of the nanometer zinc oxide. The preparation method comprises: skillfully dissolving zinc oxide into cellulose in one step through biomineralization, adding graphene oxide into the cellulose, preparing a cellulose-based graphene oxide/zinc oxide solution through the reducibility of cellulose/zinc oxide, preparing fibers through a wet spinning technique, dipping the fibers into a certain concentration of a silver nitrate solution, and carrying out irradiation through a fluorescent lamp so that the nano-silver coats the fibers and the cellulose silver/graphene oxide/zinc oxide composite fiber is formed. The preparation method is simple and environmentally friendly. The composite fiber has excellent antibacterial properties.

The invention discloses a preparation method of oxidation-resistant blueberry bread. The method comprises the following steps of performing grinding on blueberry fruits to obtain blueberry fruit pulp and performing leaching; preparing dry powder; and performing mixing, adding water, and performing fermentation to obtain bread. According to the preparation method disclosed by the invention, blueberry freeze-dried fruit powder is added; blueberry fruit powder is prepared through the following steps of firstly extracting anthocyanidin with edible ethanol under ultrasonic wave condition, then adding malt essence and performing drying to obtain the powder; and finished products of the fruit powder have better drying resistance, fine and smooth qualities and oxidation resistance, when the fruit powder is used for making the bread, the bread is fine, smooth and delicious, and after the bread is exposed to air for a long term, good effects that the bread is not liable to change color, go bad and deteriorate can be achieved.

The invention provides a preparation method of ficus religiosa-containing polyester fibers. The preparation method comprises the following steps: preparing porous silicon dioxide microspheres; thoroughly mixing secondary distilled water with ethanol to prepare an ethanol solution; and adding hexadecyl trimethyl ammonium bromide into the ethanol solution, adding an ammonia solution as a catalyst, dropwise adding ethyl orthosilicate, baking solids after a reaction, and calcining the baked solids to obtain the porous silicon dioxide. The preparation method further comprises a step of preparing aporous molecular nest containing a ficus religiosa extract: adding porous silicon dioxide powder and an ethanol aqueous solution into a ball mill, and performing grinding, shearing and dispersing to obtain porous nano-material dispersion liquid; and shearing and dispersing a saturated aqueous solution of the ficus religiosa extract, the porous nano-material dispersion liquid, a coupling agent anda surfactant to obtain nano-material dispersion liquid containing the ficus religiosa extract, and volatilizing a solvent to obtain the dried porous molecular nest containing the ficus religiosa extract. A prepared fiber finished product is high in mechanical strength and good in hygroscopicity.

The invention provides an infectious medical waste disinfectant. The infectious medical waste disinfectant comprises the following raw materials in parts by weight: 55-65 parts of modified nano zinc oxide, 15-25 parts of camphor sodium sulfonate, 10-20 parts of an antibacterial stabilizer, 3-5 parts of hydrogen peroxide and 20-30 parts of deionized water. The preparation method of the antibacterial stabilizer comprises the following steps: 1, hydrotalcite modification: crushing hydrotalcite powder into particles with the particle size of 1-2mm, and putting the particles into a water bath kettle with the temperature of 70-80 DEG C to react for 11-13 minutes. According to the invention, during modification of nano zinc oxide, bentonite is subjected to hot-pressing calcination treatment firstly, then nano zinc oxide is subjected to activation heat treatment, and the lamellar structure of nano zinc oxide can be shrunk through treatment of bentonite, so that the bearing capacity of nano zinc oxide is improved, which is due to lamellar shrinkage and lamellar clearance reduction, and therefore, the nano-zinc oxide is contracted and fixed, the position of the nano-zinc oxide is fixed, and the antibacterial stability of the nano-zinc oxide is improved.

The invention discloses a preparation method of plastic with an antibacterial function. The method comprises the following steps that 1, polypropylene resin, modified polyester fibers and eichhornia crassipes fiber composite polycarbonate are mixed, and are added into a reaction kettle, a reaction temperature is 145-155 DEG C, a stirring rotating speed is 115-125 r/min, stirring time is 15-25 min,and then swelling chlorite powder is added. The invention aims to provide the preparation method of the plastic with the antibacterial function; the antibacterial function of the plastic is greatly improved compared with that in the prior art, and the plastic has a high use value and good application prospects.

The invention discloses an azelaic acid/titanium dioxide hybrid composite material and a preparation method thereof. The method comprises the steps that: dropwise adding a caustic alkali aqueous solution into a nanometer titanium dioxide aqueous solution, conducting heating reaction, conducting cooling, washing and filtering after the reaction is completed so as to obtain a hydroxylated titanium dioxide intermediate product; stirring and mixing the hydroxylated titanium dioxide intermediate product with a solvent, performing stirring or ultrasonic dispersing at 75-85 DEG C, then adding an azelaic acid solution, performing mixing, then adding a catalyst, and introducing nitrogen for reflux reaction at 80-100 DEG C; performing sampling and testing the acid value every 30 minutes, and reaching the reaction endpoint when the acid value changes is less than 2 mg KOH/g after continuous two times of sampling; and when the reaction endpoint is reached, performing cooling, cleaning the productby using an impurity removal cleaning agent, performing filtering to obtain a solid powder, and performing drying at low temperature to obtain the azelaic acid/titanium dioxide hybrid composite material. The preparation method disclosed by the invention is simple and feasible, and the prepared hybrid composite material can directionally form a compact protective layer on the surface of skin and has dual effects of resisting bacteria and blocking sun.

The invention discloses an Allium mongolicum tissue culture bacteriostat, a preparation method thereof, an Allium mongolicum tissue culture medium, and a tissue culture method using the Allium mongolicum tissue culture medium. The Allium mongolicum tissue culture bacteriostat is extracted from 44-50 parts by weight of Allium bidentatum, 8-14 parts by weight of Herba Aristolochiae Mollissimae and 8-20 parts by weight of Stenoloma chusanum Ching, and is a natural and safe high-efficiency and wide-spectrum bacteriostasis plant extract product. The preparation method of the Allium mongolicum tissue culture bacteriostat can be used to prepare the wide spectrum bacteriostat having high-bacteriostatic activity without introducing organic solvent pollution. The Allium mongolicum tissue culture bacteriostat is added to the Allium mongolicum tissue culture medium, and is helpful for promoting the growth of plants while inhibiting bacteria. The tissue culture method using the Allium mongolicum tissue culture medium realizes the tissue culture in an open environment; and bulbs are selected as an explant to shorten the tissue culture time of the Allium mongolicum in order to realize high-reproduction rate and high-heredity stability rapid culture.

The invention discloses a composite material containing spider silk. The composite material is prepared from the following raw materials in parts by weight: 25-35 parts of spider silk, 5-10 parts of modified carbon nanotubes, 15-20 parts of polylactic acid, 3-8 parts of a nano-zinc oxide composite graphene improver, 1-5 parts of chitosan, 1-4 parts of seaweed polyphenol and 30-35 parts of an ethanol solvent. According to the composite material containing the spider silk, the spider silk, the polylactic acid and the ethanol solvent are matched, a fiber yarn structure is formed through electrostatic spinning, the antibacterial performance, the strength and the toughness performance of the product are enhanced by adding the modified carbon nanotubes and the nano-zinc oxide composite graphene improver as a synergistic enhancer, and the antibacterial performance, the strength and the toughness of the product are improved through adding and matching of chitosan and seaweed polyphenol. The compatibility among the raw materials is enhanced, and the comprehensive performance of the product is further improved.

The invention discloses a food safety based green fresh-keeping agent and a preparation method. The green fresh-keeping agent is prepared from Chinese herbal medicines including oldenlandia diffusa, resurrection lily rhizome, garlic, bitter gourd, lotus leaf and lindley eupatorium extracts. The fresh keeping test on cherry and green pepper shows that the food safety based green fresh-keeping agent has the advantages that the rotting rate is less than that of a control group, and moreover, the appearance, glossiness and the vc content are superior to those of the control group.

The invention discloses an antibacterial additive of rattan knitted product paint. The antibacterial additive is prepared from phytate, a nanometer oxide, diisocyanate, glass beads, tourmaline powder, silicon carbide whisker, hydroxy propyl distarch phosphate, plant powder, hydroxyethyl cellulose and xylitol. Compared with the existing rattan knitted product paint additive, the antibacterial additive has a reasonable formula and a low cost. All components have compatibility and produce synergism so that rattan knitted product paint storage stability is improved by 20% than that of the common rattan knitted product paint. The antibacterial additive is environmentally friendly, resists bacteria, effectively inhibits generation of pathogenic bacteria, does not pollute the environment and solves the problem of poor stability of a single antiseptic, pollution caused by a single organic antiseptic and a high cost of a single inorganic antiseptic.

The invention discloses an antibacterial fiber fabric. The antibacterial fiber fabric is characterized by being formed by blending and weaving polyester yarns, antibacterial fibers and milk protein fibers; the weight percentage of the antibacterial fibers in the fabric is 25-40 wt%, and the weight percentage of the milk protein fibers in the fabric is 10-15 wt%; the antibacterial fibers are prepared from the following components in parts by weight through a solution composite spinning method: 60 to 80 parts of a (2-methyl-1-vinyl imidazol)-(2-allyl-1,2-benzisothiazol-3(2H)-one 1,1-dioxide)-allylthiourea copolymer, 3 to 6 parts of bamboo charcoal powder, 8 to 15 parts of nano silver powder and 2 to 4 parts of a coupling agent. The invention further discloses a preparation method of the antibacterial fiber fabric. The antibacterial fiber fabric disclosed by the invention is good in antibacterial effect, excellent in antibacterial stability and excellent in water fastness, wearing comfort, wear resistance and durability.

The invention discloses a preparation method of bacteriostatic paper. The preparation method of the bacteriostatic paper comprises the following steps: firstly, selecting three fiber main materials, pretreating the three fiber main materials separately, beating and pulpling, selecting an antibacterial traditional Chinese herbal medicine material, pretreating the antibacterial traditional Chinese herbal medicine material, beating and pulping; in addition, compounding the two kinds of pulp according to the proportion to be applied to two pulp layers correspondingly, modifying the raw material pulp through high-temperature plasma treatment to improve the mutual compatibility of the raw material pulp and the antibacterial traditional Chinese herbal medicine material, and performing pre-heatingtreatment to further enhance the bacteriostatic stability of the traditional Chinese herbal medicine pulp so as to achieve the durable and bacteriostatic effect of the paper finished products.