40results about How to "Has sustained release properties" patented technology

The invention provides a material capable of controlling the slow release of a fertilizer. The composite material is synthesized by the following steps of: firstly, conducting hydro-thermal synthesis into carbon sphere materials by utilizing organic carbon materials with different concentrations; drying the carbon materials, evenly suspending into deionized water, conducting ultrasonic dispersion together with L-aspartic acid, a trace crosslinking agent and a catalyst under the condition of nitrogen protection, and synthesizing into an intermediate at a high temperature, flushing the intermediate to be neutral respectively with methanol and water; conducting crushing, basic hydrolysis and neutralization to the intermediate to be neutral, precipitating and filtering the neutralized hydrolysate into a sodium chloride-methanol saturated solution, flushing with methanol, and drying to obtain a polyaspartic acid-modified carbon sphere material. The material can be widely used in the field of fertilizers, and has an excellent fertilizer slow release effect.

The invention provides a long-acting slow-release microcapsule food antistaling agent and a preparation method thereof. The antistaling agent comprises natural antiseptic patchouli oil as the core material and natural polymer chitosan and gelatin as the wall materials. The antistaling agent is prepared by complex coacervation, comprising the following steps: preparing a chitosan-acetic acid solution and a gelatin solution, uniformly mixing 0.5-3.0wt% of the chitosan-acetic acid solution and 1.0-3.0wt% of the gelatin solution, then adding a certain amount of patchouli oil and emulsifier, emulsifying for a certain time under stirring, and then regulating the pH value of the system to a proper value, after completing the complex coacervation reaction, adding 10wt% of vanillin-alcohol solution to conduct curing crosslinking reaction for a certain time, and finally conducting pumping filtration, washing and freeze drying to obtain the powdery microcapsule food antistaling agent. The antistaling agent has the particle size of 1-10 mum, good sphericity and dispersibility, the embedding rate of 85-92%, the drug-loading rate of 30-40%, and significant slow release effect, and has no toxicity, safety, and long acting and lasting fresh-keeping and anticorrosion effects. The preparation method has the advantages of simple and easiness in operation, good repeatability, low requirement for devices, no toxicity and nature of raw materials, wide obtainment of sources, and low production cost, and is suitable for industrial production.

The invention discloses corrosion inhibitor microcapsules based on graphene rolls. The microcapsules adopt graphene as a capsule wall material and adopt an organic corrosion inhibitor as a core material. The invention further discloses a preparation method of the microcapsules. After a water solution of the organic corrosion inhibitor is blended with graphene oxide, the mixture is subjected to hydrothermal treatment at 80-200 DEG C for 8-24 h, the corrosion inhibitor is coated with the microcapsules while graphene is rolled under the hydrothermal condition, the core material coating quality is high, and the slow release characteristic of the corrosion inhibitor is good. The method adopts a simple coating process, is convenient to operate and low in preparation cost, and does not need additional aids.