4results about How to "Solve easy hydrolysis" patented technology

The invention relates to a method for extracting vanadium from a vanadium slag roasting product and preparing vanadium oxide or vanadyl sulfate, which comprises the following steps of: crushing the vanadium slag roasting product, grinding, carrying out synchronous reduction leaching in a leaching medium, regulating the pH value of a leaching solution to 0-5 by using a pH regulator, and carrying out solid-liquid separation on the leaching medium and the roasting product according to the liquid-solid ratio of (3-20): 1, so as to obtain the vanadium oxide or vanadyl sulfate. And leaching liquid containing positive divalent vanadium oxygen ions is obtained. According to the method, when the vanadium slag roasting product is leached, the reducing agent is added to directly control the valence state of vanadium in the leaching solution, tetravalent vanadium with the stable valence state is obtained, the problem that the vanadium leaching efficiency is low due to the fact that pentavalent vanadium ions are prone to hydrolysis is solved, vanadium oxyhydroxide is prepared in combination with a selective precipitation method, VO2 or V2O5 is prepared through calcination under different atmospheres, and the method is suitable for industrial production. Or in-situ extraction-reverse extraction is carried out in the reduction leachate to prepare vanadyl sulfate. The method is short in process, high in vanadium yield, compact in process linkage, less in three wastes and easy to industrialize.

The invention relates to the technical field of degradable plastics, and particularly discloses a starch-based biodegradable plastic and a preparation method thereof.The preparation method includes the steps that high-amylose starch (such as corn, potatoes and cassava) is selected as a raw material and cleaned, dried and ground to obtain starch powder, a natural plasticizer (such as glycerin) is added to improve the flexibility, and the starch-based biodegradable plastic is obtained; a chemical cross-linking agent (such as glutaraldehyde) is used for enhancing the strength and the heat stability, an antioxidant (such as vitamin E) and an antibacterial agent (such as tea polyphenol) are used as additives, and the mass ratio of the antioxidant to the antibacterial agent is (0.6-0.85): (0.05-0.2): (0.005-0.03): (0.001-0.01): (0.001-0.005). The starch-based bioplastic prepared by the invention has good degradation performance and adjustability, is particularly suitable for the fields of disposable packaging, agricultural films, medical materials and the like, has a natural antibacterial function and ultraviolet protection capability, has huge application potential in the fields of medical treatment, food packaging and environmental protection, and has wide application prospects. The advantages of the starch-based plastic in agricultural application are also realized.

The invention discloses a mineral powder marking paint and a production method thereof, which belongs to the technical field of coatings, and comprises the following steps: preparing isoleucine grafted polyethylene glycol, mixing isoleucine with an activated polyethylene glycol solution to obtain isoleucine grafted polyethylene glycol; preparing modified nano-feather fibers, dispersing the nano-treated feather fibers into an acidified silane solution, filtering, and drying to obtain modified nano-feather fibers; and stirring water, potassium silicate, titanium dioxide, astaxanthin, an auxiliary agent, and the isoleucine grafted polyethylene glycol and the modified nano-feather fibers to uniformly mix to obtain a mineral powder marking paint. By using isoleucine modified polyethylene glycol, the water resistance of the coating is improved, by adding modified nano-feather fibers, the toughness of the coating is improved, and the coating is prevented from being easily cracked, and by adding astaxanthin, the coating is enhanced in anti-ultraviolet light and anti-oxidation ability, and the aging resistance is improved.

This invention belongs to the field of polyurethane adhesive technology, specifically relating to a two-component bio-based flame-retardant polyurethane potting compound and its preparation method. It consists of component A and component B, with the molar ratio of hydroxyl groups in component A to isocyanate groups in component B being 1:(1-1.05). Component A comprises the following raw materials in parts by weight: bio-based polyol I: 44-55 parts; bio-based polyol II: 44-55 parts; crosslinking agent: 1-2 parts; catalyst: 0.1-0.5 parts; defoamer: 1.0-3.0 parts; silane coupling agent: 0.1-0.5 parts; dehydrating agent: 0.5-1.0 parts; and component B is a modified isocyanate. The potting compound's component A uses bio-based raw materials such as castor oil to synthesize a comb-shaped polyol, improving hydrophobicity and adhesion; component B introduces nitrogen and phosphorus flame-retardant elements into the modified isocyanate, achieving intrinsic flame retardancy.