42results about How to "The preparation process is non-toxic" patented technology

The invention discloses a green preparation method of modified chitosan-nanometer silver sol. In the method, catechol groups are grafted onto chitosan through amidation reaction to prepare modified chitosan. Utilizing the reduction of catechol groups and the chelating effect of chitosan, the modified chitosan was used as a reducing agent and a stabilizer, and reacted with silver nitrate solution to prepare modified chitosan-nano-silver sol. The sol prepared by the invention has the advantages of narrow particle size distribution, difficult agglomeration, high stability and the like. The synergistic antibacterial effect of chitosan and nano-silver makes the composite nano-silver exhibit strong antibacterial properties. Due to the good biocompatibility of chitosan, the biological toxicity of the encapsulated nano-silver is greatly reduced, and it has great application prospects in the field of biomedicine. The preparation method does not need an external reducing agent, has wide source of raw materials, simple process, mild reaction, and meets the requirements of green chemistry.

The invention discloses a rosin triol ester and a preparation method thereof. The chemical name of the rosin triol ester is dehydroabietic acid trimethylol propane ester. The preparation method of rosin triol ester is: take dehydroabietic acid and trimethylol propane as raw material, take EDC / DMAP as catalyst, any one in methylene chloride, tetrahydrofuran and N,N-dimethylformamide As a solvent, an esterification reaction occurs at room temperature to synthesize dehydroabietic acid trimethylol propane ester. The esterification method is completed in one step, can effectively overcome steric hindrance, has high yield, reacts at room temperature, reduces energy consumption, by-products are soluble in water and can be easily purified, has low odor and less waste, and has a wide range of solvents to choose from. The ester prepared by the present invention has a wide range of uses, such as plasticizers and modifiers that can be used for various resins, adhesives that can form good pressure-sensitive and heat-sensitive adhesive tapes, used for hot-melt coatings, surface Active agent and pharmaceutically acceptable carrier.

The invention relates to a silicon-aluminum dual binding agent vanadium-resisting additive used in a heavy oil catalytic cracking process and a preparation method thereof. The additive is characterized by comprising the following components in percent by weight: 5-45 percent of lanthana, 15-50 percent of aluminum oxide, 5-15 percent of silicon oxide, 5-20 percent of chlorine and 0.01-0.5 percent of sodium oxide. The preparation method comprises the steps of: adding the lanthana, chemical water, aluminium hydroxide and hydrochloric acid according to the requirement of the composition of the additive, wherein the aluminium hydroxide / hydrochloric acid accounts for 5-20 percent by weight; and finally, adding an acidic silica sol binding agent, mixing and pulping, homogenizing and grinding, spraying and drying to form fluidized solid microspheres with an average particle diameter of 35-85micrometers, wherein the fluidized solid microspheres have surface appearance stacking density of 0.7-1.3g / ml and specific surface area of 20-120m<2> / g. When the fluidized solid microspheres are added in an additive form and applied to the heavy oil catalytic cracking process, the intoxication of vanadium in lube oil feedstock to a system catalyst can be reduced; and according to a silicon-aluminum dual binding agent with high activity, the conversion of the heavy oil can be promoted and the yield of light oil is increased.

The invention discloses a fluorine-containing polymer functionalized carbon nanotube and a preparation method thereof. The fluorine-containing polymer functionalized carbon nanotube comprises a carbon nanotube and a fluorine-containing monomer in a mass ratio of 1: (2-10) and is obtained by graft polymerization on the surface of the carbon nanotube under the induction effect of fluorine-containing monomer. The preparation method comprises the following steps of: firstly placing the carbon nanotube and the fluorine-containing monomer in a plasma furnace; vacuumizing and introducing high-purity argon for carrying out first plasma treatment; activating with oxygen, raising temperature, and carrying out secondary plasma treatment; washing a product with acetone, carrying out vacuum filtration and drying, thus obtaining the non-toxic fluorine-containing polymer functionalized carbon nanotube with a undamaged body structure and high lubrication. The preparation method has the advantages of simple and safe operation, environmental protection and short production period. The fluorine-containing polymer functionalized carbon nanotube obtained in the end has high functionalization degree and high reaction activity and effectively overcomes the problems that the surface of the carbon nanotube is inert, and the carbon nanotube self winds and aggregates.

The invention discloses a silk fibroin / graphene composite conductive film and a preparation method thereof. The preparation method comprises the following steps: adding graphene slurry into a dispersant aqueous solution, putting it into a dialysis bag and dialysis to obtain a graphene aqueous solution, Mix the above solution and silk fibroin solution in proportion to obtain a silk fibroin / graphene mixed solution, heat the silk fibroin / graphene mixed solution and the template respectively, then drop the silk fibroin / graphene mixed solution onto the template, Dry under constant humidity to form a film to obtain a silk fibroin / graphene composite conductive film. The preparation method of the present invention is simple and efficient, the reaction conditions are mild, and the cost of materials is low. The prepared silk fibroin / graphene composite conductive film has good biocompatibility, mechanical properties and electrical conductivity, and can be used in tissue regeneration such as human nerve conduits. , the repair field and the sensor field all have extremely bright application prospects.