6 results about "SILVER COLLOIDAL" patented technology

The present invention relates to a method for preparing a metal (copper, molybdenum, zinc, magnesium, silver) colloidal solution using resonant vibration particle separation and cryogenic freezing technology, which is suitable for multiple fields such as engineering, biology and medicine. The present invention proposes a method for preparing a colloidal solution of any one of copper, molybdenum, zinc, magnesium or silver. According to the present invention, the cleaned metal blank is placed in distilled water or deionized water, and a resonant acoustic treatment is performed using an ultrasonic generator, thereby forming metal nanoparticles. Subsequently, the particles are subjected to cryogenic freezing treatment, followed by controlled cryogenic thawing, to obtain a stable metal colloidal solution with a particle size of 1-10 nm. The proposed method can generate nanoparticles of 5 to 50 nanometers in the resonant fragmentation stage, and can be further reduced to 1-10 nanometers during the cryogenic freezing process. This method can achieve a high-stability colloidal solution without the use of chemical stabilizers, avoid the production of toxic byproducts, and extend the storage period of the colloidal solution to 1 year.

The application discloses a method and device for preparing antibacterial meta-aramid filaments by dry-wet spinning, and the method comprises the following steps: (1) preparing a nano-silver colloidal solution; (2) dissolving m-phenylenediamine in an N,N-dimethylacetamide solution, adding the nano-silver colloidal solution, and then adding m-phthaloyl chloride to generate a poly-m-phenylenediamine terephthalate polymer solution by low-temperature polycondensation; adding a neutralizing agent and performing vacuum defoaming; (3) extruding the resin stock solution from a spinneret, and then sequentially passing through a primary air layer, a solidification tank, a coagulation bath, water washing, drying, high-temperature stretching, heat setting, and heat stretching to prepare the dry-wet antibacterial meta-aramid filaments. The in-situ polymerization method enables the nano-silver powder and the resin to be fully combined, the chemical modification method enables the combination of the two to be more compact and not easy to fall off, and the problem that the antibacterial performance is not strong and durable is solved.

The invention belongs to the technical field of plant preservation, and particularly relates to a compound preservative for lycoris plant fresh cut flowers as well as a preparation method and application of the compound preservative. The compound preservative is prepared from the following effective components in mass concentration: 150 to 200mg / L of citric acid, 15 to 20g / L of cane sugar, 2 to 3g / L of calcium chloride, 1 to 2g / L of chitosan, 1 to 2ppm of nano-silver colloid and 3 to 5mg / L of gibberellin. According to the invention, the nano-silver colloid, the chitosan and the hormone are combined for post-harvest treatment of lycoris plant cut flowers for the first time; four functions of antibiosis, cell energy stabilization, nutrition supply and hormone regulation are integrated, a multi-factor synergistic mechanism is established, and then the postharvest preservation effect of the lycoris plant cut flowers is remarkably improved. Results of the embodiment show that the composite preservative can prolong the life of the lycoris plant cut flower vase to 6-8 days, the phenomena that the base part of the flower stem is curled and the petals are premature senility are obviously reduced, and the good ornamental value is maintained.

This invention discloses a method for preparing a nano-silver antibacterial colloidal solution from traditional Chinese medicine using a laser physical method. First, an initial nano-silver colloidal solution is obtained in 20 ml of a PVP aqueous solution (50 ppm) using a liquid-phase laser ablation method. Specific parameters are: laser wavelength 1064 nm, frequency 25 Hz, and time 10 min. Then, 1 ml of honeysuckle extract, 25 ml of honeysuckle hydrosol, 25 ml of centella asiatica hydrosol, and 80 ml of water are added. Laser irradiation continues under stirring, with specific parameters: laser wavelength 532 nm, frequency 10 Hz, and time 3 min. After 1-3 days, the color changes from pale yellow to golden yellow / golden orange, yielding the final nano-silver antibacterial colloidal solution from traditional Chinese medicine. This method provides a new approach and idea for the green development and environmentally friendly production of safe and effective antibacterial and antiviral products; it is universally applicable and can be extended to other specific application types of nanoparticles and traditional Chinese medicine ingredients.

The invention discloses a high thermal conductivity and electric conductivity silver adhesive for LED packaging, which is prepared from the following components in parts by weight: 100 parts of bisphenol A epoxy resin, 10 to 20 parts of benzoxazine resin, 0.5 to 2 parts of 2, 5-dimethoxyphenylethylamine, 150 to 250 parts of flaky micron silver powder, 30 to 120 parts of flaky nano silver powder, 15 to 30 parts of latent curing agent and 1 to 5 parts of curing accelerator. The invention further discloses a preparation method of the high-thermal-conductivity and high-electric-conductivity silver adhesive. The epoxy resin and the benzoxazine resin are compounded, the 2, 5-dimethoxyphenylethylamine is added, and the flaky nano silver powder and the flaky micron silver powder are compounded, so that the electric conduction (heat conduction) network of the silver powder in the base adhesive is synergistically improved, the heat resistance and moisture resistance and the linear shrinkage rate are excellent, and meanwhile, the electric conduction (heat conduction) network of the silver powder in the base adhesive is improved. The raw material cost of the existing conductive silver adhesive is effectively reduced; and the silver colloid with low silver content also improves the product stability of the silver colloid system, optimizes the bonding strength and toughness of the silver colloid, and greatly widens the application range of the silver colloid.

A deodorizing formula including water, a first solute selected from sodium or potassium percarbonate, a second solute selected from sodium or potassium carbonate, and silver nano-particles wherein said silver particles may be selected from silver colloid particles, silver colloid particles coated with polyvinylpyrrolidone (PVP), and silver colloid particles comprising coated with a natural polymer. The first solute releases oxygen upon decomposition in water, while the second solute stabilizes the released oxygen. The silver nanoparticles penetrate skin pores to eliminate odor-causing bacteria and neutralize odor compounds. The method includes sequential mixing of components, aging the solution, and packaging into sprayable or topical forms for immediate and long-lasting deodorizing effects.