19891results about How to "Improve antibacterial properties" patented technology

The invention relates to an anti-bacterial thermoplastic composite, which comprises the following mixed components: 100 parts of thermoplastic by weight and 0.1-40 parts of composite antibacterial agent by weight, wherein the composite antibacterial agent comprises micronano inorganic/organic particles and guanidinesalt polymers which are coated on the surfaces of the micro/nano particles and/or embedded among pores and layers of the micronano particles; the weight ratio of the guanidinesalt polymers to the micro/nano particles is 1:1-1:50; and the micro/nano particles have at least a one-dimensional average size of 1nm-1000mum. The anti-bacterial thermoplastic composite is obtained by melting and mixing the components such as the thermoplastic, the composite antibacterial agent, and the like, therefore the antibacterial rate of the anti-bacterial thermoplastic composite is higher and the preparation method is simple.

The present invention relates to a preservative or antimicrobial compositions which comprise low concentrations of botanical extracts, in synergistic combinations with alkanediols in a solvent system, optionally with fruit acids. Additionally, the present invention relates to a preservative or antimicrobial compositions which comprise a silver compound, an essential oil or individual constituent, one or more zinc salts, and one or more alkanediol. The compositions of the invention may be used in personal care products including wound care products or in veterinary use. Preferably, the compositions of the invention have little or no human-detectable fragrance.

The invention provides a zinc thiazole-containing bactericidal composition, which contains an active compound I and a bactericidally active compound II, wherein the active compound I is zinc thiazole; the bactericidally active compound II may be any one of a methoxyacrylate bactericide, a triazole bactericide, an amide bactericide, an iminazole bactericide, a dicarboxylic imide bactericide, a carbamic acid ester bactericide, an antibiotic bactericide, an oxazole bactericide, a morpholine bactericide, a pyrimidine bactericide, a quinazolone bactericide, a dithiocarbamate bactericide or other given bactericides.

The invention is intended for a treatment of severe infections using an injectable drug-delivery system comprising nanoparticles of a biodegradable polymer with incorporated antibacterial drug.

An antimicrobial composition, including a synergistic combination of three or more agents as an active ingredient. Each of the three or more potentiating agents can be selected from the following types of compounds: sequestering agents, carbohydrates and carbohydrate derivatives, terpenes/terpenoids, amines and amine derivatives, plant-derived oils, sulfonates, phenols, fatty acids, dibenzofuran derivatives, organo isothiocyanates, quaternary ammonium compounds, peroxides and peroxide donors, and macrolide polyenes. At least two of the three or more potentiating agents are not of the same type of compound. The antimicrobial composition can have strong antimicrobial efficacy in control of microorganisms having resistance to currently used antimicrobials.

A process for production of an actively antimicrobial surface for a substrate and for use in a biologically dynamic environment, such as for treating and preventing microbial infections, including a film consisting of at least an antimicrobial element and another electrochemically nobler element and which forms multitudinous galvanic cells with electrolyte-containing biological fluids, such as body fluids from wounds, etc., for releasing the antimicrobial element at the surface.

The invention relates to anti-bacterial water-based paint and a preparation method thereof. The paint comprises the following components in parts by weight: 0.2-11 parts of anti-bacterial agent, 8-33 parts of nano material, 23-64 parts of water-based resin dispersoid and 0.75-18 parts of adhesive resin or plasticizer. The preparation method comprises the following steps: firstly preparing a nano silver anti-bacterial agent; mixing deionized water, the anti-bacterial agent, a wetting agent, a dispersing agent and a defoaming agent and uniformly mixing, adding the nano material, uniformly dispersing to obtain the water-based dispersoid; adding the obtained water-based dispersoid to the mixed emulsion or water-based resin dispersoid, then adding the adhesive resin or plasticizer and various conventional assistants, stirring and dispersing evenly; adding pigments or colorant; and supplementing water to obtain the anti-bacterial water-based paint. The long-acting broad-spectrum antibacterial water-based paint has high fungicidal efficiency (more than 99%) on escherichia coli, staphylococcus aureus, black varietas of bacillus subtilis and the like and can reduce the high concentrate of organic matters of formaldehyde to the range of specified concentration index.

The invention discloses an antibacterial polyethylene film and a method for preparing the same. The film consists of an outer layer, a middle layer and an inner layer; the outer layer consists of low-density polyethylene and linear low-density polyethylene; the middle layer consists of low-density polyethylene and linear low-density polyethylene; and the inner layer comprises low-density polyethylene, linear low-density polyethylene, metallocene linear low-density polyethylene, a slipping agent and an antibacterial agent. Compared with the prior art, the antibacterial polyethylene film has the characteristics of broad-spectrum sterilization, lasting antibacterial effect, good safety, no toxicity, no side effects and uneasy discoloration, thereby really achieving the protective function on packaged foods.

A polymeric composition having antimicrobial properties and a process for rendering the surface of a substrate antimicrobial are disclosed. The composition comprises a crosslinked chemical combination of (i) a polymer having amino group-containing side chains along a backbone forming the polymer, (ii) an antimicrobial agent selected from quaternary ammonium compounds, gentian violet compounds, substituted or unsubstituted phenols, biguanide compounds, iodine compounds, and mixtures thereof, and (iii) a crosslinking agent containing functional groups capable of reacting with the amino groups. In one embodiment, the polymer is a polyamide formed from a maleic anhydride or maleic acid ester monomer and alkylamines thereby producing a polyamide having amino substituted alkyl chains on one side of the polyamide backbone; the crosslinking agent is a phosphine having the general formula (A)₃P wherein A is hydroxyalkyl; and the antimicrobial agent is chlorhexidine, dimethylchlorophenol, cetyl pyridinium chloride, gentian violet, triclosan, thymol, iodine, and mixtures thereof.

The invention relates to a paint technology, an environment-friendly technology and an antibacterial mould-proof technology, in particular to high-efficiency environment-friendly antibacterial mould-proof inorganic composite nano paint and a preparation method thereof. The high-efficiency environment-friendly antibacterial mould-proof inorganic composite nano paint comprises the following components in percentage by weight: 0.5 to 5 percent of wetting dispersant, 0.01 to 20 percent of inorganic composite nano antibacterial agent concentrated pulp, 0.5 to 10 percent of hydrophobing agent, 0.5 to 10 percent of anionic powder, 0.5 to 8 percent of film-forming aid, 0.1 to 2 percent of anti-settling agent, 0.8 to 10 percent of antifreezing agent, 0.1 to 3 percent of defoaming agent, 4 to 30 percent of pigment, 0 to 30 percent of filler, 15 to 45 percent of emulsion, 0.1 to 4 percent of thickening agent, 0.1 to 3 percent of flatting agent, 0 to 3 percent of pH regulator and 0.5 to 45 percent of water. The high-efficiency environment-friendly antibacterial mould-proof inorganic composite nano paint is mainly prepared by adding the inorganic composite nano antibacterial agent into the basic materials, so that the paint has the coating characteristic of high performance, is low is cost, and has a function of purifying air, can eliminate harmful gas volatile organic compounds (VOC), formaldehyde and the like and also has a durable and high-efficiency antibacterial mould-proof function, so that the sterilizing rate within 6 hours reaches 100 percent and the mould-proof grade reaches the first grade. By the high-efficiency environment-friendly antibacterial mould-proof inorganic composite nano paint and the preparation method thereof, self-cleaning performance, hydrophobicity, scrubbing resistance, dirt resistance and weather resistance of the coating are improved; and the high-efficiency and durable antibacterial and mould-proof effect is achieved.

The invention provides a compound antimicrobial and a preparation method thereof. The compound antimicrobial comprises micro-nano particles and guanidine polymers by the weight ratio of 1:1 to 1:50, wherein the micro-nano particles at least have the one-dimensional average dimension of 1nm to 1000 mu m; the guanidine polymers are coated on the surfaces of the micro-nano particles and/or embedded in holes or among layers of the micro-nano particles; inorganic or organic particles comprising micro-nano particles are added to a solution of the guanidine polymers; organic alkali is added or not added; the particles and the solution are uniformly mixed and dried for obtaining the compound antimicrobial. When applied to plastics, fibers and rubber, the antimicrobial has high sterilization efficiency, also largely reduces the processing cost of antibacterial materials, and has simple and convenient preparation method.

The invention discloses paper sepiolite sustained-release antibacterial cat litters which comprise the following raw material components in percentage: 60 to 70 percent of recycled paper, 10 to 5 percent of modified sepiolite, 3 to 5 percent of peanut shell, 5 to 8 percent of plant ash, 4 to 6 percent of super absorbent resin and 5 to 10 percent of carboxymethyl cellulose. In the invention, the sepiolite is soaked in sodium phosphate after being activated at a high temperature and adsorption of the sepiolite on Ag<+> and Cu<2+> can be improved, so that an antibacterial effect of the sepiolite is improved; moreover, due to a sustained-release function of the sepiolite, the paper sepiolite sustained-release antibacterial cat litters can sterilize for a long time, have good stability and have an obvious antibacterial effect. The cat litters prepared by the invention are beneficial for improving the environment in a cat litter box, preventing breeding of bacteria on small cats and ensuring health of a master and pets.

The invention discloses a preparation method of a chelate coating with copper ions capable of controllably catalyzing release nitrogen monoxide and a polyphenol complex. The preparation method comprises the following steps: soaking a target modified material or an instrument in a mixed aqueous solution consisting of soluble metal salt, soluble copper salt and a compound having an o-phenol structure; and depositing a layer of chelate coating with copper ions with a function of catalyzing nitrogen monoxide and the polyphenol complex on the surface. The chelate coating with the copper ions and the polyphenol complex, which is obtained by the preparation method disclosed by the invention, not only has excellent biocompatibility and bacterial resistance, but also has a function of inducing catalysis of endogenous nitrogen monoxide to release in a blood environment. In addition, the coating is nearly applicable to surface modification of materials of all textures, complex geometrical shapes and different topological structures.

The invention relates to a method of the technical field of environment protection and in particular to a high salinity wastewater treatment corrosion-resistant anti-fouling membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: by taking a mixture of clay minerals and oceanic nodule minerals as inorganic nano particles, modifying the inorganic nano particles with dopamine, and combining a PVDF (Polyvinylidene Fluoride) polymer with the nano particles, thereby obtaining the high salinity wastewater treatment corrosion-resistant anti-fouling membrane. The invention aims to improve the water flux, the corrosion resistance and the pollution resistance of the membrane, the mixture of the clay minerals and the oceanic nodule minerals is adopted as the inorganic nano particles, the inorganic nano particles are subjected to surface modification with dopamine, combination of the nano particles and the PVDF is promoted, the obtained membrane is capable of efficiently treating high salinity wastewater and meanwhile has properties of corrosion and fouling resistance; in addition, the dopamine has a great amount of hydrophilic groups of amino, particle aggregation is prevented, the hydrophilcity of the membrane is improved, and the difficulties that materials are not uniformly dispersed and are easily dropped off in the use process are solved.

The invention provides a modified polypropylene master batch, melt-blow cloth, a preparation method and an application thereof. The modified polypropylene master batch is mainly produced from, by weight, 77-90% of polypropylene, 5-20% of a graphene material and 1-5% of an additive. The graphene material includes any one or more of graphene, graphene oxide and graphene derivative. The additive includes any one or more of a coupling agent, a dispersant and an antioxidant and preferably includes the coupling agent, the dispersant and the antioxidant. The modified polypropylene master batch, when being used for manufacturing the melt-blow cloth, not only improves antibacterial and electrification property but also increases the filtering efficiency and dust capacity of the melt-blow cloth.

The invention discloses a titanium alloy containing an antibacterial coating as well as a preparation method and application thereof. The titanium alloy deposited with nano-silver antibacterial coating on the surface is prepared by the following steps: preprocessing and sterilizing the surface of titanium alloy; then soaking the titanium alloy in a dopamine hydrochloride solution with mass-volume concentration of 1-10mg/mL for 12-36h to obtain titanium alloy deposited with a polydopamine thin film layer on the surface; and finally soaking the titanium alloy in a silver nitrate solution which is 5-100mmol/L in concentration for 12-36h. According to the titanium alloy disclosed by the invention, the titanium alloy is connected to silver nanoparticles by virtue of adhesion from self-polymerization of dopamine and adsorbed silver ions are reduced into nano-silver in situ through weak reducibility of the dopamine. Because of broad-spectrum antibacterial capacity of the nano-silver, an excellent antibacterial effect can be achieved with relatively low effect concentration. The invention provides new thinking for antibacterial modification of the titanium alloy, and can effectively promote application of a titanium alloy implant material in the fields of bone tissue repair and regeneration.

The invention relates to a method for preparing a nano-cellulose antibacterial composite material through on-line culture. The method comprises the following steps of: (1) inoculating an activated bacterial cellulose producing strain into a liquid culture medium, performing amplification culture, transferring the liquid culture medium into a bioreactor, culturing, adding an antibacterial material into the liquid culture medium, and continuing to culture to obtain an unpurified antibacterial bacterial cellulose composite material; and (2) peeling a bacterial cellulose membrane from a framework or directly soaking the composite material in a NaOH solution, treating in water bath, and washing until an obtained product is neutral to obtain the nano-cellulose antibacterial composite material. The preparation efficiency is high, and the method is simple, convenient, feasible and low in cost; and the surface of the bacterial cellulose composite material has a nanoscale three-dimensional fibrous mesh-shaped structure, the tensile strength of the material is greatly improved compared with that of a pure bacterial cellulose membrane, and the material can be widely applied to products such as facial masks, wound dressings, plasters, artificial skins and the like.

The invention provides an antibacterial master batch based on a guanidinium polymer and a preparation method thereof. The antibacterial master batch comprises the following blended components: a matrix resin, a composite antibacterial agent and a dispersant, wherein, on the basis of 100 parts by weight of the matrix resin, the composite antibacterial agent is 10 to 30 parts by weight, the dispersant is 2 to 10 parts by weight, the matrix resin is at least one selected from the group consisting of low-density polyethylene and high-melt index polypropylene, and the composite antibacterial agentis a polyguanidine/polysilicate composite antibacterial agent and is prepared by mixing an aqueous solution of water-soluble polyguanidine inorganic acid salt or organic acid salt with an aqueous solution of water-soluble silicate and adding an aqueous solution of water-soluble metal salt. The antibacterial master batch is used for antimicrobial modification of polypropylene, and addition amount of the antibacterial master batch is 2 to 10 wt % of the matrix material polypropylene; prepared modified polypropylene has the advantages of high antibacterial efficiency, a white color, good washingfastness, etc.

The invention relates to a tilapia mossambica feed, in particular to an artificial compound feed for tilapia mossambica. An artificial compound feed with function of preventing tilapia mossambica streptococcicosis comprises the following components in percentage by mass: 5 to 10 percent of fish meal, 20 to 30 percent of bean pulp, 20 to 30 percent of rape pulp, 10 to 15 percent of cotton pulp, 10 to 15 percent of DDGS (maize alcohol lees and residual liquid dry substance), 5 to 10 percent of rice bran, 15 to 20 percent of flour, 5 to 10 percent of maize, 1 to 2 percent of soybean oil, 0.5 to 1.5 percent of phospholipid oil, 1 to 2 percent of calcium hydrogen phosphate, 1 to 10 percent of bentonite, 0.5 to 1 percent of multi-dimensional multi-mineral premix, 0.1 to 0.5 percent of choline chloride, 0.01 to 0.05 percent of antioxidant, 0.1 to 0.5 percent of mildew-proof agent and 1 to 5 percent of composite Chinese medicinal additive. Multiple antibacterial Chinese medicinal herb additives are added into the feed, so the feed improves the antibacterial capability of the tilapia mossambica and can prevent the tilapia mossambica streptococcicosis.

The invention provides a nano-silver antibacterial fabric and a preparation method thereof. The nano-silver antibacterial fabric has the characteristics that a zinc oxide nano line grows on the fabric; and silver nano particles are deposited on the zinc oxide nano line. The zinc oxide nano line is synthesized by a solution chemical method; and the silver nano particles are deposited on the zinc oxide nano line by a simple 'immersion-illumination' method. The nano-silver antibacterial fabric prepared by the method has extremely obvious long-time antibacterial performance; the silver nano particles are small in size and cannot be accumulated; a synthesis process is environment-friendly; and the nano-silver antibacterial fabric can be recycled and reused. The nano-silver antibacterial fabric can be used for single-point water treatment to reduce microorganism content in water and can be suitable for medical surgical dressing and medical fabrics; and the nano-silver antibacterial fabric can be used as an antibacterial air filtration device for preventing bio-aerosol from being gathered on a ventilating, heating and air conditioning system.

The invention relates to a preparation method of an edible film with antibacterial and antioxidant functions, and belongs to the technical field of edible packaging materials. The preparation method disclosed by the invention comprises the following steps: 1) dissolving and gelatinizing corn starch; 2) dissolving gelatin; 3) dissolving chitosan; 4) adding glycerin and plant essential oil or essential oil components; 5) mixing, homogenizing and refining; 6) degassing; 7) tape-casting; and 8) drying and stripping the film. The preparation method disclosed by the invention has the beneficial effects that the chitosan, the corn starch and the gelatin are taken as base materials of the edible film, the sources of the raw materials are wide, the cost is low, and the prepared edible film has the advantages of strong mechanical properties, high barrier performance and great transparency. Oregano oil, carvacrol and cinnamaldehyde are taken as an antibacterial agent and an antioxidant so as to be added into the edible film, the processing process is simple and easy to operate, the cost is low, the edible film is non-toxic and safe to eat, and the prepared edible film has great antibacterial and antioxidant properties.