52results about How to "Fall off in time" patented technology

The invention relates to a preparation method of flaky zinc powder. The preparation method comprises the following steps in sequence: machining metallic zinc into a flake and using the flake as a soluble anode; in an anode chamber of an electrochemical reactor, taking zinc sulfate and sulfuric acid water solution as an electrolyte, oxidizing the soluble anode into zinc ions and enabling the zinc ions to enter anolyte; and after solid-liquid separation and anolyte impurity removal, adding an alkyl glycoside surfactant to the anolyte and adjusting the pH value to 5.0-6.5, then injecting the electrolyte into a cathode chamber of the electrochemical reactor, carrying out electrochemical reduction reaction on the cathode and separating out metallic zinc through deposition, simultaneously starting an ultrasonic generating device to strip metallic zinc on the cathode and deposit metallic zinc in the electrolyte below the cathode and then obtaining the qualified flaky zinc powder through solid-liquid separation, washing, vacuum drying, screening and packaging. The preparation method has the advantages of reasonable and convenient process, safe and reliable preparation course and good prepared product quality.

The invention discloses a method for preparing biodegradable ocean antifouling polyurethane hybrid materials and a product thereof. The method for preparing the biodegradable ocean antifouling polyurethane hybrid materials and the product thereof adopt stannous octoate as a catalyst, adopts double hydroxyl functional grapheme which is prepared by adopting reduction grapheme to react with 2, 2-hydroxy benzaldehyde and N-glycine as an initiator, and the initiator triggers L-lactide monomers to prepare graphene grafted poly lactic acids through ring opening polymerization. 1, 4-butanediol and 4, 4-diphenyl methane diisocyanate prepare polyurethane prepolymers containing Isocyanate functional groups on the tail ends through condensation polymerization. The biodegradable ocean antifouling polyurethane hybrid materials are prepared by utilizing a chemical reaction between graphene grafted hydroxyl-terminated poly lactic acids and polyurethane prepolymers. The method for preparing biodegradable ocean antifouling polyurethane hybrid materials and the product thereof improve strength of target materials by leading into grapheme, and the grapheme plays the role of antibacterial function during the degradation process, and control crystallinity and hydrophobic property of grafted poly lactide by adjusting the contents of the grapheme and the L-lactide monomers, thereby effectively adjusting and controlling degradation of polyurethane. hybrid materials which are prepared through the method for preparing biodegradable ocean antifouling polyurethane hybrid materials has excellent mechanical properties and can adjust degradation rate, degradation products are non-toxic and do not pollute the environment, and can be applied in antifouling marine coatings and drug controlled release carriers in a biomedical medical engineering.

The invention relates to a stone thinning and rolling device. A support base is used as a support base of the device, and a support plane is arranged at the upper end; a buffer component is arranged on the upper part of the support base, and includes a guide column perpendicular to the support plane and a guide column sleeved on the support base. The first elastic piece on the guide column has at least four guide columns; the outer casing has a sliding hole at the bottom corresponding to the position of the guide column, is slidably connected with the guide column, and is elastically supported by the first elastic piece. The stones are squeezed by the second crushing plate, and the stones will squeeze the lower end of the first crushing plate, so that the upper end of the first crushing plate swings to the direction close to the second crushing plate, and at this time the second crushing plate is rising The trend of rubbing the stones upwards, while the first crushing plate has a tendency to push the stones downwards, therefore, the upward movement of the stones can be avoided, and the rubbing of the stones by the second crushing plate is strengthened. Strength, a combination of factors, makes the stone easier to be broken.