7results about How to "Improve antibacterial function" patented technology

The invention relates to a high-strength antibacterial spandex fabric and a preparation method thereof, and belongs to the technical field of functional textile materials. The spandex fiber comprises a spandex fiber matrix and a functional polymer layer grafted on the surface of the matrix through a covalent bond, and the functional polymer layer is a polymer of an unsaturated derivative of natural phenolic acid and is prepared by introducing carbon-carbon unsaturated bond groups such as acryloyloxy and the like into the natural phenolic acid through esterification or etherification. During preparation, the spandex fiber is subjected to plasma pretreatment, and then the spandex fiber and the natural phenolic acid-containing unsaturated derivative monomer are subjected to thermal initiation or photo-initiation graft polymerization to form the functional layer. The lasting and stable antibacterial function is achieved through covalent bond grafting, the natural phenolic acid derivative endows the fiber with the environment-friendly and non-dissolution type antibacterial property, the functional layer can improve the modulus and breaking strength of the fiber, the intrinsic elasticity of spandex is considered, the comfortable fitting characteristic of the composite fabric is reserved, and the composite fabric is endowed with the high strength and the antibacterial function.

This invention belongs to the field of functional textile materials and provides a cooling and antibacterial polyester fabric and its preparation method. The invention employs a melt-blended spinning design of a thermally conductive antibacterial core-shell masterbatch and a polyester matrix. The masterbatch uses a zinc oxide submicron rod-shaped inorganic core as its core, coated with a silane coupling layer and a quaternized copolyester shell. During fiber drafting, the one-dimensional zinc oxide rods are aligned axially, significantly improving the longitudinal thermal conductivity of the fiber and enhancing the instantaneous cooling sensation upon contact. Simultaneously, the quaternized copolyester shell exhibits good compatibility with the polyester matrix, constructing a dense, wash-resistant, and antibacterial network. This achieves synergistic optimization of high-strength, fine-denier spinnability with high-filler thermal conductivity, durable antibacterial properties after 50 machine washes with a soft and comfortable feel, and high functionalization efficiency with low migration safety. It resolves the technical contradictions in existing polyester fabrics regarding thermal conductivity and cooling sensation versus antibacterial durability, functionality versus safety, and processability versus comfort, and has broad application value in areas such as intimate apparel and bedding.

The invention discloses a design and preparation method of a multi-layer polyurethane composite product, and belongs to the field of high polymer materials. Aiming at the problems that elasticity, strength and rapid prototyping are difficult to balance and interlayer bonding is weak in the traditional polyurethane gel, the preparation method disclosed by the invention is realized through full-chain innovation and comprises the following steps: firstly, synthesizing a polyhydric alcohol monomer with high primary hydroxyl group content; soft inner gel prepolymers A and B and hard outer gel prepolymers C and D are further prepared, a light curing mechanism is introduced into the prepolymer D, and chemical-light dual curing is achieved; a combined pouring process is adopted, specifically, a polyurethane outer film is subjected to vacuum adsorption shaping, an inner gel layer is poured for preliminary curing, then an outer gel layer is poured, rapid shaping is conducted through ultraviolet radiation, and finally overall stepped curing is conducted. The product has a three-layer structure, the layers are firmly combined through chemical bonding, the hardness is low, the rebound rate is high, the permanent deformation is small, the pressure dispersion efficiency is excellent, the forming period is short, and the product is suitable for the fields of high-end medical care, ergonomic support and the like.

The invention discloses a preparation method and application of a nano-emulsion bacteriostatic agent with mango peel as a material, and belongs to the technical field of botanical pesticide preparations, the method comprises the following steps: drying and crushing the mango peel, and extracting with a first polar solvent to obtain a first crude extract; dissolving with a second polar solvent, adjusting the pH value to an isoelectric point, and carrying out ultrasonic-assisted extraction and standing layering to obtain an upper organic phase; removing a solvent to obtain a refined extract, and mixing the refined extract with an emulsifier and water to form a pre-emulsion; and carrying out high-speed shearing and high-pressure homogenization treatment to obtain the nano-emulsion bacteriostatic agent. The invention further provides application of the prepared nano emulsion bacteriostatic agent, the technical problems that an existing plant source bacteriostatic agent is low in active ingredient extraction efficiency, easy to degrade, poor in stability, not prone to uniform dispersion and the like are solved, efficient enrichment and stable encapsulation of the active ingredients are achieved through the integrated extraction, refining and nano emulsification technology, and the bacteriostatic agent has the advantages of being environmentally friendly, free of toxic and side effects and the like. Therefore, the antibacterial effect and the storage stability of the final product are remarkably improved.

The application provides a completely biodegradable resin and a preparation method and application thereof, and belongs to the technical field of biodegradable materials.The completely biodegradable resin comprises the following raw materials: carbon dioxide-based polycarbonate, a toughening agent, an anti-blocking agent and an auxiliary agent; the carbon dioxide-based polycarbonate comprises PPC-P, PPCX, PPC-Plus and other degradable polyester resin.The preparation method can significantly improve the elongation at break of the raw material, while ensuring that the material has good tensile strength.Compared with the PBAT polyester film, polyolefin film and other film materials currently circulating in the market, the degradable resin film prepared by the application has better barrier performance and antibacterial performance to carbon dioxide and other gases, and is expected to replace traditional materials and be applied in the field of plastic film.

The application discloses a fruit active fresh-keeping material and a preparation method and application thereof. Modified amphiphilic nano carbon particles are selected as a self-assembly coating, and an amphiphilic multi-walled carbon nanotube coating with high bacteriostatic effect is loaded on a self-developed substrate by using a self-assembly coating technology, so that a multilayer molecular film is formed on the surface of the substrate, metabolic gas and moisture permeability are effectively adjusted, the high oxygen resistance, low moisture permeability and excellent bacteriostatic function of the fruit active fresh-keeping material are realized. The fruit active fresh-keeping material prepared by the application contains a plurality of substances with natural bacteriostatic function in raw materials, adopts a substrate and a multilayer molecular film structure, guarantees mechanical properties, has high oxygen resistance, low moisture permeability and high bacteriostatic performance, better blocks microorganisms and environmental pollution, can adjust a fruit storage sealed micro-gas environment, reduces a physiological metabolic rate of the fruit, realizes the functions of prolonging fruit storage time and shelf life, and improves quality safety of the fruit.

The invention provides an antibacterial surface segregation covalent organic framework as well as a preparation method and application thereof, and relates to the field of separation membrane materials. The organic framework material disclosed by the invention is prepared by taking a covalent organic framework nanosheet with an internal antibacterial function as a segregation agent, physically blending the covalent organic framework nanosheet with a polymer matrix and utilizing a non-solvent induced phase separation process. The method comprises the following steps: firstly, synthesizing a covalent organic framework nanosheet dispersion liquid through a single-phase method, then blending the covalent organic framework nanosheet dispersion liquid with a high polymer material to prepare a membrane casting liquid, and finally, constructing a compact functional skin layer on the surface of the membrane and in pore channels through a non-solvent phase inversion process by utilizing the spontaneous surface segregation effect of covalent organic framework nanosheets in a phase separation process. The prepared membrane is of a typical asymmetric structure, and the antibacterial rate of the membrane on escherichia coli is high; the developed finger-shaped pore structure endows the membrane with high flux characteristic. The method effectively solves the problem of membrane biological pollution in the field of water treatment, and has the synergistic advantages of high flux, high interception and efficient antibiosis.