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1816results about How to "Composition is stable" patented technology

Encapsulated active materials

The invention is an encapsulated active agent comprising an active agent encapsulated in a crystallizable or thermoplastic polymer wherein the particle size of the encapsulated active agent is 3,000 microns or less wherein the active agent is not significantly extractable from the particles under ambient conditions. In another embodiment the invention is a process for preparing an encapsulated agent which comprises a) contacting an active agent with a crystallizable or thermoplastic polymer wherein the polymer is molten and the active agent in not volatile under the contacting conditions; b) forming particles of about 3000 microns or less; and c) exposing the particles to conditions such that the portion of the particle at and near the surface undergoes rapid solidification. The encapsulated active agents of the invention do not require washing in order for them to be stable in curable compositions. These encapsulated active agents can be designed to release the active agent at a desired temperature. The encapsulated agents of the invention demonstrate excellent stability at ambient temperatures and exhibit relatively rapid reactivity upon release of the active agent. Furthermore, the presence of the encapsulating agent does not result in deterioration of adhesive or elastomer properties of a cured composition after preparation.
Owner:LANDEC +1

Method for preparing nano iron phosphate

The invention relates to a method for preparing nano iron phosphate, belonging to the technical field of the preparation of lithium ion battery cathode materials. The method is characterized by comprising the following steps: inputting an alkaline aqueous solution and a mixed solution formed by one of phosphoric acid or a soluble phosphate solution, one of a water-soluble ferrous salt solution and an oxidant or a ferric salt solution and a water-soluble dispersing agent into a rotating packed bed layer by a metering pump at a certain feeding speed; regulating the rotating speed of the rotating packed bed and controlling the pH value of the reaction system by an alkaline solution; discharging nano iron phosphate particles generated by reaction crystallization from a discharge hole of the rotating packed bed along with the mixed solution; and filtering, washing and drying the nano iron phosphate particles to obtain nano iron phosphate (FePO4.2H2O) powder. The method is simple and has easy operation and high efficiency, and the prepared iron phosphate reaches the nano grade, has uniform particle size and narrow distribution range and is suitable for industrialized production. The nano iron phosphate is a good precursor material for preparing lithium iron phosphate which is used as a cathode material of high-power type lithium ion batteries.
Owner:TSINGHUA UNIV

PVC wood-plastic low foaming granule material and preparation method thereof

The invention discloses a PVC wood-plastic low foaming granule material and a preparation method thereof, and belongs to the technical field of wood-plastic materials. The PVC wood-plastic low foaming granule material comprises the following substances in portion by weight: 20 to 60 portions of wood powder or / and bamboo powder, 100 portions of polyvinyl chloride, 2 to 12 portions of composite stabilizing agent, 5 to 60 portions of CaCO3, 0.6 to 6 portions of foaming agent, 2 to 16 portions of assistant foaming agent, 1 to 10 portions of processing assistant, 0.6 to 6 portions of lubricating agent, 0.6 to 4 portions of coupling agent, and 0.1 to 0.8 portion of paint. The method for preparing the PVC wood-plastic low foaming granule material comprises the following steps: mixing and heating the substances; plasticizing the substances; extruding the substances into columnar granules; and separating and packing the granules as a product. The PVC wood-plastic low foaming granule material has relatively stable components and lighter texture, and is convenient to transport, store and process. The preparation method is simple and practical, saves energy, and saves investment; and the quality of the product is stable.
Owner:翁端华
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