A kind of preparation device and preparation process of polymer-based spherical powder

Abstract

The invention provides a preparation device and preparation technology for polymer-based spherical powder. The preparation device comprises a grinding disc grinding system and an inductive coupling plasma powder nodulizing system, and the grinding disc grinding system of the preparation device achieves material ultrafine grinding under the room temperature condition by exerting strong extruding stress, cutting stress and circumferential stress to materials; and the inductive coupling plasma powder nodulizing system takes high-temperature plasmas as a high-temperature heat source, polymer powder is heated uniformly, the melting and cooling rate is high, and nodulizing treatment can be completed in an ultrashort time. According to the preparation device, the preparation process of the polymer-based spherical powder is integrated and achieves continuous production, the preparation technology is significantly improved, therefore, the polymer-based spherical powder material which has the excellent performance and can be applied to the SLS field is prepared, and large-scale batch production can be achieved.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation device and a preparation process of a polymer-based spherical powder, which is especially suitable for the preparation of raw materials for selective laser sintering technology. Background technique [0002] Selective laser sintering (SLS) technology is an important 3D printing technology, which is an advanced manufacturing method based on discrete / stacking principles that has developed rapidly in recent years. SLS technology uses the thermal effect of laser to selectively melt powder materials according to CAD model, and superimpose them layer by layer to form the final product. Compared with traditional processing methods, the technical advantages of SLS processing mainly lie in free forming and integral manufacturing, which can be used to produce parts with arbitrary complex structures, and realize the customized production of complex parts. [0003]...

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Problems solved by technology

But there are also certain defects: the cryogenic pulverization method is simple to operate, but the powder mixing effect and powder shape are poor; the powder prepared by the solvent precipitation method is uniform in size and uniformly mixed, but the operation is complicated and the production efficiency is low; the spray drying method consumes a lot of energy. organic solvents that may pollute the environment

[0006] But the technical content of above-mentioned disclosed prior application patent also has following defect or problem: 1, the used grinding disc type solid-phase mechanochemical reactor (patent No. is ZL95111258.9, publication number is CN1130545A) is based on The patent applied for by the applicant of the invention in 1995, the reactor is a vertical grinding disc, the vertical grinding disc has no vacuum system and hydraulic device, relying on manual feeding and pressurization, the operation is complicated, and the production efficiency is not high; 2. The preparation method adopts The technical process of primary grinding, melt extrusion pelletizing, secondary grinding and spheroidization treatment has been established. The process is complicated, the production efficiency is not high, and there is no specific production equipment, so it is difficult to scale and continuous production; 3. Spherical The chemical treatment adopts the technical means of spheroidizing the composite powder after the secondary grinding in the dispersant, but the type of dispersant needs to be determined according to the physical properties of the polymer, and the adaptability of a single dispersant to the type of polymer Narrow, the dispersant needs to be filtered and washed to remove in the post-treatment process, and there will still be dispersant residue on the prepared product powder, the physical and chemical properties of the product will be affected, and the removed dispersant may affect the environmental pollution

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