36results about How to "Simple and economical" patented technology

The invention discloses a preparation method of a waterborne polyurethane emulsion modified by a natural monosaccharide compound. The preparation method comprises the following steps: firstly, adding polyglycol to a dry reaction bottle, heating to melt the polyglycol in the reaction bottle and vacuumizing to removal water for 1 hour at 120 DEG C; next, adding a hydrophilic reagent, a chain extender and diisocyanate to the reaction bottle to have a polymerization reaction, thereby obtaining a polyurethane prepolymer; next, adding the natural monosaccharide compound for reacting, cooling after a period of time, and adding an organic base to regulate the pH value of the reaction; and adding deionized water under high speed stirring for emulsifying, and removing the solvent by virtue of reduced pressure distillation, thereby obtaining the waterborne polyurethane emulsion modified by the natural monosaccharide compound. According to the preparation method, the waterborne polyurethane is modified by use of the natural monosaccharide, and the product has excellent overall properties, and also is environment-friendly, harmless, cheap and the like. The coating of the product can be just thermally decomposed at 300 DEG C; compared with the polyurethane before modification, the heat resistance of the modified polyurethane is obviously improved, and meanwhile, the water tolerance of the modified polyurethane is also greatly improved.

A system for determining the presence and optionally the position of an ophthalmic product such as a contact lens in a container is provided.

The invention relates to preparation and application of a SnO2 nanorod array/reduced graphene oxide composite nanomaterial sensitive to formaldehyde gas. The raw materials used in the preparation method of the material comprise Na2SnO3. 4H2O, absolute ethyl alcohol and water. The preparation method comprises the following steps: (1) forming seed crystals on a reduced graphene oxide substrate; (2)preparing a hydrothermal synthesis precursor reaction solution; (3) putting apolytetrafluoroethylene lining filled with the precursor solution into a miniature reaction kettle for reaction; and (4) repeatedly cleaning a reaction deposition product with deionized water and absolute ethyl alcohol, separating acleaned sample, and drying to obtain a finished product. The raw materials of sodium stannate (Na2SnO3. 4H2O),solvent absolute ethyl alcohol, and water ratio andseed crystal oriented treatment technology are irreplaceable. The SnO2 nanorod array/reduced graphene oxide composite nanomaterialdisclosed by the invention can be used as a gas sensitive material, and particularly has a high-sensitivity outstanding effect on formaldehyde gas.

The invention provides a Mannich base quaternary ammonium salt compound; the invention also provides a preparation method of the Mannich base quaternary ammonium salt compound; and the invention alsoprovides an application of the Mannich base quaternary ammonium salt compound in corrosion and sterilization of steel pipelines in oil exploitation. The Mannich base quaternary ammonium salt compoundprovided by the invention can reduce inconvenience of compounding of a plurality of corrosion inhibitors and bactericides, has excellent corrosion inhibition performance and certain bactericidal ability when being used as a bactericidal corrosion inhibitor; and the compound has a simple synthetic method, mild reaction conditions, low costs and wide sources of raw materials, and can reduce costs toa certain extent.