83results about How to "Increase negative charge" patented technology

Methods of forming electrostatically charged gelatin are provided. Gelatin is extracted by an acid extraction method (12) thereby producing a gelatin dispersion (14), the pH of which is adjusted to the isoelectric point of the gelatin. The pH of the gelatin dispersion (14) is then further adjusted (22) so as to cause the gelatin to assume an electrostatic charge.

The invention provides a heavy metal contaminated soil restorative agent. The restorative agent is prepared from the following components in weight ratio: 20-30 percent of biomass charcoal, 30-50 percent of quick lime, 10-20 percent of molecular sieve, 10-20 percent of sodium bentonite, 1-10 percent of polyepoxysuccinic acid and 1-10 percent of sodium lignin sulfonate. A preparation method for the heavy metal contaminated soil restorative agent comprises the following steps: firstly, mixing the biomass charcoal, quick lime, molecular sieve, sodium lignin sulfonate and sodium bentonite in mass ratio to obtain a mixture; and then, adding the polyepoxysuccinic acid into the mixture in mass ratio to stir and uniformly mix, thereby obtaining the prepared soil restorative agent. The prepared soil restorative agent has good effect in restoring the cadmium, lead and zinc compound contaminated soil.

The invention discloses a cadmium-arsenic composite polluted soil remediation agent, which comprises the following raw materials in parts by weight: 0-10 parts of hematite; 20-30 parts of ferrous sulfate; 10 parts of manganese dioxide; 15-20 parts of fly ash; 10-15 parts of quicklime; 10-15 parts of sepiolite; 10-15 parts of calcium dihydrogen phosphate; and 0-10 parts of wollastonite. The remediation agent enables cadmium and arsenic heavy metals to form stable chemical forms through oxidation reduction, adsorption, ion exchange, precipitation or coprecipitation and the like to reduce the migration and diffusion capability of the cadmium and arsenic heavy metals in the environment, so that the ecological environment risk of the cadmium and arsenic heavy metals is reduced; and the remediation agent has the advantages of high remediation efficiency for cadmium-arsenic composite polluted soil, short remediation period, low remediation cost, easily available raw material components and simple application method, so that the agent is one of the few remediation agents in the industry that simultaneously act on yin and yang heavy metal ions.

The invention relates to a hollow-structured transition metal cobalt and nitrogen co-doped carbon oxygen reduction catalyst as well as a preparation method and application thereof. A zeolite imidazatemetal organic framework material grows on the surface of a template by utilizing electrostatic interaction between sulfonic acid groups on the surfaces of microspheres and metal cobalt ions, and thenthe zeolite imidazate metal organic framework material is prepared by pyrolysis and carbonization in an inert atmosphere. According to the method provided by the invention, the active site utilization rate of the transition metal cobalt and nitrogen co-doped carbon catalyst can be effectively improved, the prepared catalyst can efficiently catalyze the oxygen reduction reaction of the cathode ofthe fuel cell, and the oxygen reduction catalytic activity is superior to that of commercial Pt/C.

The invention provides a repairing agent used for governing cadmium-contaminated soil. The repairing agent comprises, by weight ratio, 5-10% of polyacrylamide, 5-20% of a reducing agent, 5-10% of chitosan, 5-10% of sodium lignin sulfonate, 50-75% of calcium oxide and 5-10% of plant ash. The reducing agent is a mixture prepared through sodium thiosulfate and ferrous sulfate according to the mass ratio of 7:3. Materials with the particle size not smaller than 200 meshes are ground and are evenly mixed according to the above proportion to form the repairing agent. The prepared soil repairing agent has good effects in repairing cadmium-contaminated soil and has the beneficial effects of being simple in preparing method, feasible and good in governing effect.

The invention relates to the technical field of membrane separation materials, and particularly relates to a preparation method of a polyvinylidene fluoride (PVDF) membrane with a catalytic self-cleaning function. According to the preparation method provided by the invention, 4-amino pyridine is grafted onto the main chain of PVDF by covalent bonds, then metal phthalocyanine is axially coordinatedthrough N elements on pyridine rings, and a Fenton-like modifier is prepared. The modifier is blended with PVDF powder, and the PVDF composite membrane is prepared by a non-solvent induced phase inversion technology. According to the composite film prepared by the method, the hydrophilicity, the pore diameter, the voidage and the negative charge of the PVDF membrane are improved, the permeabilityflux and the pollution resistance of the PVDF membrane are improved, and moreover, the PVDF membrane is endowed with a catalytic self-cleaning capability.

The invention provides a method for aqueous phase transfer of hydrophobic materials, including the following steps: A) adding silk fibroin nanofiber solution into the organic solution of hydrophobic materials, thoroughly mixing to obtain a mixed solution, wherein the organic solution of the hydrophobic materials includes hydrophobic materials and organic solvents, the organic solvents are one or more of ethanol, acetonitrile, acetone and dimethyl sulfoxide, B) subjecting mixed solution to high-speed centrifugation to obtain the silk fibroin nanofiber loaded with hydrophobic material, C) resuspending the silk fibroin nanofiber loaded with hydrophobic materials in water and dispersing in aqueous phase. The specific conformation and nanostructured silk fibroin nanofiber carrier of the invention has hydrophilic and hydrophobic blocks, the hydrophobic block captures the hydrophobic material, the hydrphobic material can be effectively loaded on the nanofiber carrier and the solubility of thehydrophobic molecule in the aqueous phase can be increased, therefore, the bioavailability is improved.

The invention provides a self-extinction waterborne polyurethane coating and a preparation method thereof, belonging to the field of aqueous coatings. The coating comprises a component A and a component B. The component A comprises the following components in parts by weight: 30 to 40 parts of organic silicon modified waterborne polyurethane, 10 to 20 parts of water-based hydroxyl acrylate dispersoid, 12 to 18 parts of modified silicon dioxide extinction powder, 5 to 10 parts of lignin, 2 to 5 parts of light calcium carbonate, 1 to 3 parts of halloysite, 1 to 3 parts of sericite, 4 to 8 partsof polyamide wax slurry, 0.5 to 1 part of an MA-SAS-BA copolymer dispersing agent, 0.1 to 0.2 part of triethanolamine, 0.1 to 1 part of lauryl sodium sulfate, 1 to 1.5 parts of sodium monododecyl phosphate, 2 to 6 parts of a water-based defoamer BYK024, 4 to 8 parts of a water-based leveling agent BKY346, 5 to 10 parts of propylene glycol monomethyl ether, 0.1 to 1 part of a nonionic polyurethaneassociative thickener, 10 to 20 parts of propylene glycol methyl ether acetate and 60 to 80 parts of water. The component B is a curing agent WT-2102. The self-extinction waterborne polyurethane coating disclosed by the invention is stable in property; and a film formed by the coating is stable in property and resistant to acid, alkali and solvent corrosion, and has strength, toughness and hardness meeting national standards.

The invention discloses a preparation method and application of modified short-straight-chain starch, and belongs to the technical field of nano composite materials. The preparation method is characterized in that short-straight-chain starch is modified by chloroacetic acid, carboxyl is led into the short-straight-chain starch, and negative electric potential of the short-straight-chain starch isincreased. Carboxymethyl short-straight-chain starch is taken as a carrier, and chitosan is led in for embedding insulin, so that characteristics such as wide source, low price and high embedding rateare achieved, and very good effect can be achieved for embedding insulin. A preparation process for preparing carboxymethyl short-straight-chain is green and environmentally friendly, is gentle in reaction condition, is simple and practicable in process route, is easy for industrial operation, and has a large-scale popularization and application potential.

The invention discloses a passivator for restoring heavy metal pollution in soil. The passivator is prepared from the following raw materials in parts by weight: 25-50 parts of bentonite mineral powder, 20-60 parts of straw ash, 20-60 parts of animal dung, 10-20 parts of lime, 15-40 parts of ferric hydroxide and 10-30 parts of a phosphate. The passivator provided by the invention has a stable repairing effect on heavy metal pollution in acidic and neutral soil; the cost is low; the use amount is small; a small amount of the passivator is applied to reduce the pollution of heavy metals in the soil to enable normal growth of plants in the soil; no negative influence is caused; and secondary pollution cannot be caused.

The invention relates to the filed of fiber manufacture, in particular to a fiber manufacture method of micro-nano powder comprising bismuth germinate. The invention uses polyester, polypropylene or nylon as base material which comprises 1 percent to 50 percent of multielement mixing ultra-fine powder by weight percentage, and the multielement mixing ultra-fine powder comprises the following ingredients by the following weight percentage: 1 percent to 49 percent of bismuth germinate micro powder, 1 percent to 49 percent of tin dioxide, 1 percent to 2 percent of trace elements beneficial to human bodies, such as calcium, kalium, iron, zinc, silver, and the like, and the granularity of the trace elements is from 0.3 micron to 0.5 micron. After being sliced, the base material is stirred with the multielement mixing ultra-fine powder, wherein the weight percentage of the mixed ultra-fine powder in the base material slices is 1 percent to 50 percent, then 1 percent to 5 percent of a polymer spinning aid is added, melted and fully stirred for 20 minutes at a melting temperature of 260 DEG C to 286 DEG C, and the mixture is sprayed, cooled, fixed, curled, pulled to form the fibers comprising the bismuth germinate.

The invention relates to a succinyl-beta-cyclodextrin modified PAN film adsorbing material and a preparation method thereof. The method comprises the following steps: firstly forming a dense polydopamine intermediate layer on a PAN film, wherein the polydopamine intermediate layer contains a large amount of hydrophilic hydroxyl and amino functional groups, and performing dehydration condensation on the amino of the polydopamine intermediate layer and carboxyl of succinyl-beta-cyclodextrin to obtain the succinyl-beta-cyclodextrin modified PAN film adsorbing material. The adsorbing material provided by the invention has good adsorption performance on hexavalent uranium through enveloping action of a hollow cavity of the cyclodextrin and uranium and action of carboxyl of succinyl and the hexavalent uranium, greatly improves the removal efficiency of the hexavalent uranium, and is easy to recover and recycle; and the succinyl-beta-cyclodextrin particles are firmly loaded and not easily disembedded, and have uniform loading, thereby increasing the contact area with pollutants, and improving the treatment efficiency.

The invention discloses an eye beautifying instrument. The eye beautifying instrument comprises a bottom plate, a lifting unit and a buffering unit; wherein the buffering unit is arranged on a front side of an upper surface of the bottom plate; the lifting unit comprises a motor, a fixed block, a lead screw, a movable block, a connecting plate and an electric telescopic rod, wherein two fixed blocks are arranged and bottom ends of the fixed blocks are respectively connected with left and right ends of a rear side of the upper surface of the bottom plate, grooves are formed in inner side of thetwo fixed blocks, a lead screw is rotatably connected in the grooves, a bottom end of the motor is connected with a top end of the fixed block, an output shaft of the motor is connected with a top end of the lead screw, two movable blocks are arranged and the two movable blocks are respectively slidably connected with the grooves on the inner side of the two fixed blocks, screw holes on sides ofthe two movable blocks are respectively in threaded connection with the two lead screws, and left and right ends of the connecting plate are connected with the inner sides of the two movable blocks. The eye beautifying instrument is convenient to use, strong in applicability, good in massage effect and diversified in function.

The invention discloses slurry for hole drilling and wall protection. The slurry is prepared from the following components: water, bentonite and an admixture according to the mass ratio of (8 to 14) to (0.8 to 1.2) to 0.01, wherein the admixture is prepared by mixing water, sodium bentonite, polyaluminum chloride and sodium carbonate according to the ratio of (600 to 800ml) to (60 to 80g) to (1.4to 1.65g) to 1.54g. The slurry disclosed by the invention has a good wall protection effect; the slurry is uniform and the viscosity ratios of upper and lower layers are the same; the inner part of asand layer is drilled in a rotary manner and hole collapse is not caused; and the slurry has suitable viscosity and does not cause a drill pasting phenomenon.

The invention discloses an improved farmland contaminated soil passivator, a preparation method thereof and a soil remediation method, the passivator mainly aims at heavy metal pollutants Cd and Pb infarmland soil, and the passivator is composed of modified attapulgite, biochar, quick lime and phosphate. The attapulgite is modified, so that the attapulgite is loaded with nano iron oxide or ferrichydroxide core-shell particles, and the adsorption and repair capacity of the attapulgite is enhanced. The repairing technological process is optimized, the adding sequence of passivator components is specifically optimized, and the repairing effect is better.

The invention provides a multifunctional coating suitable for urinary medical instruments. The multifunctional coating is prepared from a bio-based anionic polymer and organosilicon quaternary ammonium salt. The invention further provides a preparation method of the multifunctional coating. The invention further provides the compound suitable for the urinary medical apparatus and instruments. The multifunctional coating provided by the invention has relatively good antibacterial performance, protein adhesion performance, bactericidal performance and anti-crusting performance.