35results about How to "Shape and size are easy to control" patented technology

The invention relates to a water-emulsified polydimethylsiloxane functional sponge, a preparation method and application thereof. The preparation method includes: mixing a prepolymer A of polydimethylsiloxane with a curing agent B evenly, then adding an organic solvent, then adding water dropwise, at the same time performing stirring, then conducting standing for preliminary curing; and carrying out heating curing, and removing the organic solvent and water, thus obtaining the water-emulsified polydimethylsiloxane functional sponge. The functional sponge prepared by the method provided by theinvention has the advantages of large oil absorption ratio, fast oil absorption rate, recyclable use, high porosity, adjustable thickness and the like, can be applied to separation of oil and non-polar organic solvent in water, and has great application value in oil leakage emergency treatment, oil-water mixture separation treatment and other fields.

The invention relates to an ultrathin carbon membrane preparation method which comprises the following steps: forming a carbonization precursor layer on the surface of a first substrate, and carryingout in-situ carbonization on at least a part of the carbonization precursor layer by using a laser writing technique to obtain a dense ultrathin carbon membrane, wherein the first substrate has a thermal expansion coefficient of minus 5*10<6>-60*10<6> / K, the first substrate has a laser absorption coefficient of 0.01-3, and materials of the carbonization precursor layer at least comprise carbonizeable macromolecules; the thickness of the carbonization precursor layer is 10-2000nm; the thickness of the ultrathin carbon membrane is 3-600nm. The method provided by the invention is rapid and efficient, low in cost and feasible in large-scale production, sizes and patterns of the carbon membrane can be automatically controlled, and the carbon membrane has an ultrathin thickness.

The invention discloses a rolling and extruding combined forming method for ribbed thin-wall ring components with large height-diameter ratios. The rolling and extruding combined forming method includes steps of setting cover dies for constraining ring blanks and placing the ring blanks in the cover dies; driving main rollers to rotate by power systems of ring rolling mills to drive the cover dies to drive the ring blanks to rotate and linearly feeding core rollers to extrude the ring blanks to increase the heights of the ring blanks until the heights of the ring blanks are consistent with those of the cover dies; replacing the core rollers by extruding male dies; adjusting auxiliary rollers opposite to the main rollers to allow the auxiliary rollers to cling to the surfaces of the cover dies; driving the male dies by hydraulic cylinders to forwardly move and extrude ring components which are in contact with working surfaces of the male dies, and forming local mesh rib structures by means of extruding; allowing the male dies to return and allowing the auxiliary rollers to rotate at the low speeds to drive the cover dies to rotate clockwise by certain angles; repeatedly carrying out previous steps until integral mesh rib structures are formed on the surfaces of the ring components by means of extruding. The rolling and extruding combined forming method has the advantages that the integral ribbed thin-wall ring components with the large height-diameter ratios can be seamlessly formed in a near-net manner, surface rib structure welding forming can be replaced, cutting machining can be obviously reduced, accordingly, the manufacturing efficiency and the product quality can be improved, the manufacturing costs can be reduced, and the manufacturing ranges can be extended.