Abstract: A foldable nozzle assembly and a bidet are provided. The foldable nozzle assembly includes a nozzle body. The nozzle body is equipped with a nozzle base, and a limiting component is installed between the nozzle base and the nozzle body. A rotational component on the nozzle base allows for the pivotal attachment of a rotating base, which supports a nozzle. The nozzle can be folded onto the nozzle base using the limiting component and the rotational component, enabling the foldable functionality of the bidet nozzle, reducing space occupation, and facilitating storage. The invention features a simple structure, ease of use, and practicality.

Abstract: The present invention relates to a preparation and purification method for cationic quaternary ammonium salt of sodium hyaluronate in homogeneous medium. By adding a homogeneous solvent and a sodium hyaluronate solid to a vessel, heating the vessel until the contents are dissolved to form a homogeneous system, adding an aqueous solution of 2,3-epoxypropyltrimethylammonium chloride (GTA) to the homogeneous system, then adding a base catalyst, and stirring at a preset temperature to carry out a graft reaction, a graft product is obtained wherein 2,3-epoxypropyltrimethylammonium chloride is grafted to the oxygen atom of the hydroxymethyl group of sodium hyaluronate. By using the method, a graft product wherein 2,3-epoxypropyltrimethylammonium chloride is grafted to the oxygen atom of the hydroxymethyl group of sodium hyaluronate is obtained. Addition of salts is avoided during the reaction, a grafting yield up to 0.69 is obtained, and coagulation occurred to the product is effectively solved.