6results about How to "Short residence time" patented technology

This invention belongs to the field of polymer synthesis and microchemical technology, and discloses a method for synthesizing hydroxyl-terminated polybutadiene in a continuous flow microchannel reactor. The preparation method includes mixing butadiene, anhydrous ethanol, 30% hydrogen peroxide, and an antioxidant under nitrogen protection to obtain a raw material liquid, which is then pumped into the microchannel reactor via a high-pressure metering pump. The mixture undergoes preheating initiation and polymerization reactions sequentially, with viscosity monitored by an online viscometer. After the reaction, the product is obtained through gas-liquid separation, sedimentation and stratification, washing, vacuum solvent removal, and filtration. This invention utilizes a microchannel reactor, which provides precise temperature control and stable pressure. Segmented temperature control and online viscosity adjustment prevent reactor blockage, resulting in high product conversion and yield, and uniform molecular weight distribution. By adding auxiliary devices to optimize the process, continuous and stable production is achieved, making it more efficient, environmentally friendly, and controllable.

The utility model discloses an ink production is with storage tank, belong to ink production device technical field. The utility model discloses a storage tank body, scraper and support, be equipped with the storage cavity in the storage tank body, the scraper is contacted with the inner wall of storage cavity, the outer surface of scraper is equipped with counterweight, is equipped with the guide rail in the storage tank body, and the guide rail is linked together with storage cavity, and the counterweight is slidably fitted in the guide rail. The utility model discloses the scraper and counterweight who sets up the ink scraping of storage cavity inner wall, so that when the storage tank body is inclined to a certain angle and pours out the ink, the counterweight slides down along the guide rail, drives the annular scraper and scrapes the ink remaining on the inner wall of the storage tank body, and the counterweight drives the scraper reset when the storage tank body is back to normal, avoids the sealing problem and cost increase problem of using electric push rod, and the structure is simple with the mode of gravity drive, and reliable operation reduces the failure rate and maintenance cost of equipment.

This invention relates to a continuous flow stepwise crystallization method and system for preparing micro / nano HMX at the microscale. It includes the following steps: (1) dissolving HMX in a solvent to form an HMX solution, and mixing the solvent and antisolvent to prepare a crystallization transfer solution; (2) flowing the HMX solution prepared in step (1) and the antisolvent into a primary micro-mixing crystallization unit at a desired flow ratio to generate a mixed-crystal HMX suspension with a mixed crystal particle size of 400 nm–60 μm; (3) flowing the mixed-crystal HMX suspension flowing out of the primary micro-mixing crystallization unit and the crystallization transfer solution prepared in step (1) into a secondary micro-mixing crystallization unit at a desired flow ratio, and secondary crystallizing the mixed-crystal system to obtain a pure β-HMX suspension with a crystal size in the micrometer range. This invention can obtain micro / nano β-HMX with high crystallization degree and high crystal purity by changing the mixing conditions and residence time in the secondary crystallization unit; the two-step crystallization method can meet the requirements for continuous and controllable preparation of high-quality elemental β-HMX with smaller crystal size and higher crystal purity.

The invention relates to a reaction system and method for continuously preparing a naphthenic amine hardener. The system comprises a microchannel reactor module, a slurry feeding unit and a hydrogen supply unit. The slurry feeding unit is used for providing slurry to the microchannel reactor module. The slurry comprises a raw material, a solvent and a catalyst, the raw material is 4, 4 '-diaminodiphenylmethane (MDA), and the hydrogen supply unit is used for supplying hydrogen to the microchannel reactor module to be in gas-liquid contact with the slurry and perform hydrogenation reaction to form a product containing 4, 4'-diamino-dicyclohexylmethane (PACM).

This utility model discloses a stamping die for rapid demolding, including a fixed die base, a punch base, and a demolding assembly. Through a precisely designed rotating mechanism and abutment teeth, the scrap sheet is smoothly ejected. A drive motor is installed in the die to drive the rotating ring assembly and the core-removing ring seat to generate relative motion, effectively demolding through meshing and lifting actions. A spring device is installed on the bottom surface of the fixed die base to push the punching ring downwards, assisting in the ejection of the scrap sheet. This die reduces the adhesion of scrap to the die surface, improves production efficiency, and extends the die's service life. The overall structure is simple, operation is easy, and it is widely applicable to metal stamping, plastic processing, and other fields.

The application relates to the technical field of plastics, in particular to a preparation method and application of low-temperature-resistant degradable plastics. The low-temperature-resistant degradable plastics contain, in parts by weight, carboxylated polycaprolactone C-PCL: 80-90 parts, modified lignin: 15-20 parts, nano-cellulose: 5-10 parts, crosslinking agent: 2-3 parts, and antioxidant: 0.3-0.5 parts. The modified lignin is prepared by grafting epoxy groups after the alkaline lignin is protected by p-benzene dicarboxaldehyde and hydroxylated; the crosslinking agent is prepared by condensation reaction of vanillin and hexanediamine, and the imine bond contained in the crosslinking agent endows the material with a good degradation rate under acidic conditions. The low-temperature-resistant degradable plastics prepared by the application have good low-temperature mechanical properties and excellent degradation speed under acidic conditions in the case of guaranteeing a certain service life, and are suitable for application to agricultural mulching films in cold environments.